119 results on '"Sudarja"'
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2. Major diseases of dragon fruit (Hylocereus spp.) in coastal area of Pangandaran, West Java, Indonesia
- Author
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Sudarjat, Mubarok, S., Isnaniawardhani, V., Bawani, R., Yulia, E., and Widiantini, F.
- Published
- 2019
- Full Text
- View/download PDF
3. Improving the Quality of Environmentally Friendly Liquid Smoke Distillation Process to Increase Artisan Income
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Sukamta Sukamta, Sudarja, Rini Marlina, Muhammad Muzthohidun, and Agus Winarno
- Subjects
appropriate technology ,coconut shell ,distillation ,liquid ,smoke-liquid ,Human settlements. Communities ,HT51-65 - Abstract
The problems the Smoke-liquid Craftsman Group often faces are production capacity, product quality, and low selling prices. Low production capacity due to the limited ability distillation machine. The low quality of smoke-liquid products is due to the absence of standard quality. The smoke produced from the coconut shell charcoal production process has the potential to disturb the environment, so it has been carried out the process of melting smoke into liquid, which is then called smoke-liquid. However, the resulting smoke-liquid is still mixed with ash, brown colour, and intense aroma, and still contains much tar, so it does not meet the standard quality for food preservatives the price is low. The objective of this activity is to apply appropriate technology is carried out by enforcing standard product quality and repairing distillation machines to produce high-quality smoke liquid. This one is to support renewable and environmentally friendly energy programs while being able to increase revenue. Appropriate Technology (TTG) is in the form of improvements in distillation technology, which was previously a distiller using annular pipes, where the inner pipe is 1/2 inch. The outer pipe diameter is 1.5 inches and is changed with parallel heat pipe exchanger technology using an inner pipe with a diameter of 1 inch and an outer pipe with a diameter of 4 inches. The result of this service is prototyping a new distillation machine that can increase the production capacity and quality of liquid smoke that meets the specified standard quality and increase the selling price four times.
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- 2023
- Full Text
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4. Perilaku Antarmuka Berdasarkan Data Beda Tekanan pada Peristiwa Kondensasi Aliran Uap Dengan Pendinginan dari Luar Searah pada Pipa Horisontal Berbasis Domain Waktu
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Sukamta Sukamta, Hasan Asy Ari Dwiearto, and Sudarja Sudarja
- Subjects
two-phase flow, condensation, steam-condensate, differential pressure, horizontal pipe. ,Mechanical engineering and machinery ,TJ1-1570 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
A two-phase flow pattern experiment on the condensation event of steam flow with external cooling based on the measurement of pressure difference within a horizontal pipe is carried out by varying the superficial velocity. Annulus pipes with inner pipe material made of copper and outer pipe made of galvanized iron (GIP) within an insulation of 10 mm thick were used in this experiment. The length of the pipe is 1.6 meters, outer diameter of 4 inch and inner diameter of 17 mm. The two-phase flow pattern was investigated based on differential pressure fluctuations between the inlet and outlet. To support the observation, flow pattern visualization was performed using a transparent pipe with a diameter of ¾ inch and a length of 1.3 meters connected to the test pipe section. The superficial vapor velocity was carried out from JG = 0.0689 m/s to JG = 1,9117 m/s. The results showed stratified flow patterns for the lowest superficial velocity and also obtained wavy, wavy-slug, and slug. Annular flow patterns can not be observed in this experiment. In general, increasing superficial velocity of steam will cause a significant increase in pressure fluctuations.
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- 2018
- Full Text
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5. Pengaruh Fraksi Udara Terhadap Koefisien Perpindahan Kalor Kondensasi Refrigeran Petrozon Rossy-22 Di Dalam Pipa Tegak
- Author
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Sudarja Sudarja, Purnomo Purnomo, and Prajitno Prajitno
- Subjects
petrozon rossy 22, vertical pipe, air fraction, condensation heat transfer coefficient ,Mechanical engineering and machinery ,TJ1-1570 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Petrozon Rossy-22 is one of hydrocarbon refrigerants which environmentally safe, since there is no effect on either ozone depletion or global warming. In the refrigeration cycle, imperfect vacuuming process or other factors that permit circulation of air taken place in the system predicted influencing heat transfer rate in condenser. Therefore, research on the influence of air fraction against condensation heat transfer coefficient of Petrozon Rossy-22 inside vertical pipe to be done. A modified refrigeration system of vapor compression was applied in this research, where the condensation was done in the 2 meters straight vertical condenser (double pipe heat exchanger, that further called as test section). The diameter of internal and external pipe were ¾” and 1 ¼” respectively. Electric heater was installed on upstream of the test section. Mixture of air- refrigerant was flowed downward inside internal pipe, while cooling water was flowed upward through annulus. The varied parameters were: air fraction, air-refrigerant and cooling water flow rate. The result of the research indicated that condensation heat transfer coefficient significantly decreased when air fraction increased. The proposed empiric equation is : Nu = 0.0138. (1-w)8.8198. Re0.7941. Pr4.7315with determination coefficient of 0.6927 and average absolute deviation of 17.65 %. The equation was for Re= 6.922-12.953, Pr= 2,008-2,696, and w= (0,25-1)%.
- Published
- 2016
6. Pengolahan Limbah Industri Sawit Sebagai Bahan Bakar Alternatif
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Sudarja Sudarja, Kuncoro Diharjo, and J Pramana Gentur Sutapa
- Subjects
limbah sawit , briket arang, nilai kalor ,Mechanical engineering and machinery ,TJ1-1570 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
pengolahan buah sawit di industri sawit menyisakan limbah serat buah sawit yang menumpuk di lingkungan perusahaan, dan mayoritas hanya digunakan sebagai urug atau dibakar. sebaliknya, masyarakat membutuhkan bahan bakar alternatif pengganti bbm, mengingat ketersediaan bbm yang makin menipis dan harganya relatif mahal. oleh karena itu kajian tentang pengolahan limbah biofiber (serat sawit) sebagai bahan bakar alternatif dipandang penting dan mendesak untuk dilakukan.Bahan utama penelitian adalah limbah sawit, dan perekat pati. serat dan cangkang sawit yang memiliki kandungan c tinggi diarangkan, yaitu dibakar pada tabung tertutup (menggunakan retort). selanjutnya dibentuk briket arang dilakukan dengan mencampur serbuk arang dengan perekat pati kemudian ditekan pada cetakan dengan mesin pres. pengujian yang dilakukan terhadap briket arang ini meliputi uji: kadar air (berdasarkan astm d-3173), nilai kalor (astm d-5865), kadar abu (astm d-3174), kadar zat menguap (astm d-3175 )dan kadar karbon terikat (astm d-3172). Hasil penelitian menunjukkan bahwa briket arang yang terbuat dari campuran cangkang dan serat sawit memiliki nilai kalor rata-rata 7.121,57 k kal/kg, kadar air rata-rata 8,9 %, kadar zat menguap rata-rata 18,43% dan kadar abu rata-rata 4,46%. untuk menentukan kelayakan penggunaan briket arang dari limbah sawit ini, perlu dilakukan dua penelitian lanjutan, yaitu tentang persentase abu terbang dan uji ekonomis.
- Published
- 2016
7. Analisis Rekayasa dan Karakterisasi Briket Bahan Bakar dari Limbah Serat Kenaf
- Author
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Sudarja Sudarja
- Subjects
Mechanical engineering and machinery ,TJ1-1570 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
The amount of rejected hibiscus cannabinus fiber reaches 30% during harvesting and 10% of the fiber bought by industries because they are not satisfied the quality requirement. In other words, 37% of the harvested hibiscus cannabinus fiber is rejected and become waste. On the other hand, the society need alternative fuel instead of fossil fuel due to its availability and high-price. Therefore, a study on the utilization of hibiscus cannabinus fiber waste for alternative fuel is urgently required. The main materials used in this research are hibiscus cannabinus fiber waste and starch glue. The first step is producing star-coal by burning the hibiscus cannabinus fiber in a closed tube (chamber) followed by producing starcoal briquette by blending starcoal powder and starch glue, and finally, pressing it in a pressing machine. The characteristic being studied are: water content (comply to ASTM-D-3173), calorific value (ASTM D-2015 and ASTM D-5865-03), and ash content (ASTM D-3174). The result of the research shows that the average calorific value of hibiscus cannabinus fiber waste is 6595,65 kal/gram while that of the briquette compacted at 1090 psi or above was 7394,14 kal/gram. The average water content was 10,9%, and ash content is 31,67%. Advanced study concerning the percentage of fly ash and economic aspects was recommended in order to justify its feasibility.
- Published
- 2016
8. Pengaruh Lokasi Ketebalan Maksimum Airfoil Simetris Terhadap Koefisien Angkat Aerodinamisnya
- Author
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Teddy Nurcahyadi and Sudarja Sudarja
- Subjects
airfoil, lift coefficient, maximum thickness location, angle of attack, free stream velocity ,Mechanical engineering and machinery ,TJ1-1570 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Airfoil performance data is regarded as highly valuable data in its wide area of application since it will help the designer, for examples; to predict the influence of rear spoiler mounting to the maneuverability and top speed of racing car, the thrust and fuel consumption needed for an aircraft to take off and cruise, or the power delivered by a wind turbine rotor at certain wind speed. The performance of airfoil, which is measured with its lift and drag coefficient, is greatly affected by its geometry and operating condition. The influence of various geometric and operational parameters to the airfoil performance is needed to be studied experimentally and the airfoil performance data obtained can be added to enrich the airfoil performance data base. The experiment was done by testing airfoil models by lift force direct measurements in a sub-sonic wind tunnel. The type of airfoil used in this experiment is the symmetric airfoil with maximum thickness location as the geometric parameter and angle of attack with wind speed as the operational parameter being investigated for their influence to the lift and drag coefficient. The maximum thickness location was varied in 30%, 40%, and 50% of chord length measured from leading edge. The angle of attack was varied from 0o to 20o with 4o increments. The wind speed was varied from 10 m/s to 20 m/s with 2 m/s increments. Parameters being measured were the free stream velocity, and the lift force. The result of the research shows that the best airfoil performance with lift coefficient 3,16 is achieved by the airfoil that has maximum thickness location in 40% of its chord length measured from its leading edge and operates at 20o angle of attack and 8,9 m/s free stream velocity.
- Published
- 2016
9. Analisis Unjuk Kerja Boiler Feed Pump Turbine Untuk Kapasitas Ketel Uap 2000 Ton/Jam Di PLTU Cirebon Jawa Barat
- Author
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Sukamta Sukamta, Sudarja Sudarja, and Muhammad Mujaddid Ighna Wathon
- Subjects
performance, pressure, temperature, boiler feed pump turbine ,Mechanical engineering and machinery ,TJ1-1570 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Boiler feed pump turbine (BFPT) has an important role in the circulating of demin water from deaerator to the separator of steam power plant operations (PLTU) in Cirebon. Flow rate, temperature and pressure were important parameters in boiler feed pump process. Based on the BFPT function, it was necessary to do the analysis interpretation of the performance BFPT. Data needed for evaluation include pressure and temperature on the suction, pressure and temperature on the discharge, and flow capacity. In this study, the data were taken starting in January to December 2014. Data processing was performed using a centrifugal pump calculations, presented in tables and graphs using MS Excel. Analysis of data using qualitative interpretation of quantitative data. BFPT efficiency during operations in 2014 decreased in February - March amounted to 17.91% (BFPT A) and 18.04% (BFPT B). BFPT A highest efficiency obtained in January amounted to 73.76%, the lowest in March amounted to 55.45%. The highest efficiency BFPT B in February amounted to 72.94%, the lowest in March amounted to 54.9%. Change of Performance BFPT occur due to changes load generator power plant that led to the pressure change and flow capacity. Other factors that degrade the performance because BFPT was operated continuously for 24 hours and the age of BFPT sufficient old cause decrease in pump performance.
- Published
- 2016
10. Pembuatan Alat Uji untuk Mengikat Partikel Logam yang Terkandung dalam Pelumas Akibat Gesekan Mesin
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Sukamta Sukamta, Sudarja Sudarja, Nurdarojat Nurdarojat, and Agung Prasetyo
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Mechanical engineering and machinery ,TJ1-1570 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
One of the factors that can affect to the quality of lubricantion is metal particle content due to friction of engine parts. Metal particle in lubricanting oil could damage the engine parts, so it is neccessary to reduce the metal particle content which mingled in lubricant oil. The experiment was conducted in laboratory scale using power magnetic type ring neodymium possessing diameter of 19 mm and thickness of 2 mm. The experiment was conducted by flowing the lubricanting oil containing metal particle continually and put the magnets in engine so that the metal particle will be taken up by the magnets. The experiment used three variations of time (5, 10 and 15 minutes) and three variations of valve to controlling the flow rate using. The highest absortion of metal particle was reached on opening valve 30 for 15 minutes. When volume the flow rate was 200 ml/s and the time was 15 minutes the result of absortion was 7.48 % (magnet A), meanwhile for volume the flow rate 180 ml/s and the time was 15 minutes resulted in particle absortion of about 7.37 % (magnet B). When Magnet A and B used together and at the same flow rate and time, i.e. 180 ml/s time 15 minutes, resulted the particle absortion about 17.98 %.
- Published
- 2015
11. Pengaruh Grain Size Arang Aktif dari Bahan Limbah Industri Sagu Aren terhadap Penyerapan Polutan Limbah Batik
- Author
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Sudarja , Novi caroko , Kuncoro Diharjo
- Subjects
Mechanical engineering and machinery ,TJ1-1570 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Sago palm industries leave large amount of wood waste that is about 30% of the volume of tree trunks, 20% in large size which can be used for the handcraft and about 10% in small-size which only wasted. On the other hand, batik industries produce hazardous and toxic waste (B3), that should be neutralized since this liquid waste are bad smell and hard color, and even toxity (contain various kinds of chemical elements and heavy metals such as Mercury (Hg), Lead (Pb), Chromium (Cr), Cadmium (Cd), and Copper (Cu)) and if the elements are absorbed by human body exceeds the threshold point, it would be dangerous. Therefore, experiment on activated carbon engineering and its use in adsorbing the B3 batik liquid waste is urgently required. The main objective of the experiment is to know the adsorbsion effectivity of activated carbon in adsorbing the batik liquid waste. The main material used in producing activated carbon is waste palm tree trunks. The main material is heated to be charcoal in retort for about 5 hours, temperature around 500 º C. Furthermore, charcoal is crushed finely and screened in sizes of mesh 25, 35 and 50. Carbon powder then chemically activated using H2SO4 solution by heating in 500 ˚C for about 30 menutes. Finally this activated carbon used for adsorbing the hard colour and heavy metal (Pb, Cr, Cd) in the batik waste water. This research concluded that the sago aren industrial waste may be an alternative material for activated carbon which is effective in adsorbing the hard colour and hazardous heavy metal. Higher mesh size (grain size) of activated carbon give higher adsorbsion in colour and heavy metal. Activated carbon in mesh 25 adsorbed 68.59% Cd, 16.65% Cr, and 100% Pb, mesh 35 adsorb 76.25% Cd, 37.55% Cr and Pb at 100%, while mesh 50 adsorb 81.61% Cd, 58,33% Cr, and 100% Pb.
- Published
- 2015
12. Kaji Eksperimental Efektifitas Penyerapan Limbah Cair Industri Batik Taman Sari Yogyakarta Menggunakan Arang Aktif Mesh 80 dari Limbah Gergaji Kayu Jati
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Sudarja , Novi Caroko
- Subjects
Mechanical engineering and machinery ,TJ1-1570 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Utilization of teak wood saw scratches can be optimized by processing it becomes active charcoal which possesses higher economic value. The purpose of this study is to obtain mesh 80 activated charcoal made from teak sawing industrial waste and to determine it’s effectiveness in adsorbing heavy metals pollutant Cd, Pb, Cr, and colouring agent in liquid waste of batik industries. The charcoal is produced at ~5000 oC retort either for 4 hours or until white colour smoke does not appear. Charcoal was activated using H2SO4 at temperature of 5000 oC for 30 minutes in a furnace. There were 2 variables in this study, i.e weight of the activated charcoal (10, 15, 20 grams) and duration of the stirring (5, 10,15 minutes). Result of the research shows that activated charcoal made from teak wood saw scratches can be used as adsorbent in the liquid waste of batik industries such as heavy metals Cd, Pb, Cr, and dark colour. The colour gradation was found to decrease from 12600 TCU to 198 TCU, Pb content decrease from 0,189 mg/l to less than 0,0093 mg/L, Cd content decrease from 0,213 mg/l to less than 0,0093 mg/L, while Cr content decrease from 2,03 mg/l to 0,4205 mg/l.
- Published
- 2015
13. Two-Phase Flow Patterns of Air – Water and Oil in Mini Channel Against Horizontal Position.
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Sukamta, Faiz, Z A, Sudarja, and Sundari, S
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- 2024
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14. PENINGKATAN KETERAMPILAN BERBAHASA MELALUI LOMBA CIPTA – BACA PIDATO DAN BERITA PADA SISWA SMP NEGERI 2 PLUPUH SRAGEN JAWA TENGAH
- Author
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Sitorus, Jonter Pandapotan, primary, Purwanti, Christina, primary, Sudarja, Kusman, primary, Puspita A, Kiky, primary, and Suteja, Hanna, primary
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- 2023
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15. Fraksi Hampa Aliran Dua-Fase Udara-Air dan Minyak pada Pipa Kapiler dengan Kemiringan 75 Derajat Terhadap Horisontal
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Sukamta Sukamta, Fani Nur Hidayat, Sudarja Sudarja, and Sri Sundari
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Materials Science (miscellaneous) ,Business and International Management ,General Agricultural and Biological Sciences ,General Business, Management and Accounting ,Industrial and Manufacturing Engineering - Abstract
Parameter cukup berperan dalam kestabilan aliran dua fase pada peralatan mesin adalah fraksi hampa, karena akan berpengaruh pada fluktuasi tekanan dan pola aliran yang terjadi, sehingga dapat membahayakan sistem. Oleh karena itu, penelitian ini bertujuan mendapatkan data primer tentang fraksi hampa yang terjadi pada pipa mini/kapiler khususnya pada kemiringan 75 derajat terhadap horizontal. Penelitian ini menggunakan pipa uji do=1,6 mm dan panjang 160 mm. Fluida kerja berupa udara dan campuran air dengan minyak kelapa konsentrasi 350 mg/dl dan 500 mg/dl. Kecepatan superfisial gas (JG) = 0,08 – 74,6 m/s dan kecepatan superfisial cairan (JL) = 0,04 – 4,15 m/s. Pola aliran diamati menggunakan kamera berkecepatan tinggi, dan olah data menggunakan image processing. Diperolah hasil pola aliran plug, slug-annular, annular, dan churn. Perbedaan konsentrasi fluida tidak berpengaruh secara signifikan terhadap pola aliran dan fraksi hampa, akan tetapi justru tegangan permukaan yang memilki pengaruh cukup besar pada nilai fraksi hampa dan pola aliran.
- Published
- 2022
16. Experimental investigation on basic characteristics of multi-component two-phase flow in an inclined mini pipe.
- Author
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Sudarja, Sukamta, Nurfauzan, Naufal Hafizh, Yudha, Fitroh Anugrah Kusuma, and Kumolosari, Eli
- Subjects
- *
TWO-phase flow , *FLOW separation , *ANNULAR flow , *SURFACE tension , *POROSITY , *VISCOSITY - Abstract
Research on basic characteristics of gas-liquid two-phase flow (flow patterns, void fraction, and pressure gradient) has been carried out experimentally. Dry air and mixture of 65% distilled water, 30% glycerin, and 5% butanol represented the gas and liquid phases, respectively. The addition of butanol was aimed to decrease the liquid surface tension, while the addition of glycerin was to increase the viscosity of the liquid. The density, kinematic viscosity, and surface tension of the liquid were 1080.7 kg/m3, 2.558 mm2/s, and 61.2 milli N/m, respectively. The test section was a 1.6 mm inside diameter glass pipe which occupied with optical correction box. The gas superficial velocities (JG) were in the range of 0.025 - 66.3 m/s, while the range of liquid superficial velocities (JL) were 0.033 - 4.935 m/s. The experiment was carried-out at adiabatic condition. The bubbly, plug, slug annular, churn, and annular flow patterns were emerged, while separated flow were absent. For plug flow, the increase of JG proportionally affected to the increase of the void fraction. However, for the other ones, there was no specific relation between JG and their void fraction. It was because of the slip between the velocity of the gas and liquid. In term of pressure gradient, the increase in JG and/or JL affected the increase in the pressure gradient. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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17. Experimental study on the flow pattern and pressure gradient of air-water two-phase flow in a horizontal circular mini-channel
- Author
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Sudarja, Haq, Aqli, Deendarlianto, Indarto, and Widyaparaga, Adhika
- Published
- 2019
- Full Text
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18. MENDORONG PROSES MODERNISASI PERTANIAN KELOMPOK TANI “SRI MULYO”, SLEMAN
- Author
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Sudarja, Sudarja, primary, Supangkat, Gatot, primary, and Khurniawan, Almudi, primary
- Published
- 2022
- Full Text
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19. Karakteristik Pola Aliran Air-Udara, Campuran Air+Gliserin (G20)-Udara, dan Campuran Akuades+Butanol 4%-Udara Pada Pipa Horizontal Berukuran Mini
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Jayadi, Farid, primary, Sudarja, Sudarja, additional, and Komolosari, Eli, additional
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- 2022
- Full Text
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20. Hubungan Motivasi Dan Prestasi Akademik Mahasiswa Keperawatan Saat Pembelajaran Daring Pada Situasi Pandemi Covid-19
- Author
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Indira Yobi, Juana Ivory Nababan, Risnariani Irmayanti Fua, Ni Gusti Ayu Eka, and Kusman Sudarja
- Abstract
Online education is a method of imparting knowledge that makes use of the internet or computer network technology. Students' motivation can influence online learning, which can influence their academic achievement. Students are motivated to act to achieve their goals through motivation in their learning, where academic success is a result of their actions or work. Additionally, because of the Covid-19 pandemic, the method of instruction has shifted entirely online, which may affect students' motivation and academic achievement. This study aimed to identify the relationship between students' motivation and academic achievement in online learning during the Covid-19 pandemic at a private university. This study applied correlational quantitative research with a cross-sectional approach. The population in this study was 337 second-year nursing students at a private university. This study used simple random sampling. Data collection was carried out in January-March 2021. Data were analyzed using univariate and bivariate analyses. This study recruited 201 second-year nursing students. There was a significant relationship between students’ motivation and academic achievement (p-value = 0.025). Students’motivation was associated with academic achievement in online learning during the Covid-19 pandemic at a private university. Maintaining a high level of motivation is critical for online education, even more so given the current pandemic situation. As a result, both educators and students require an effective strategy for sustaining or increasing students’ motivation and academic achievement. Keywords: Motivation, Academic Achievement, Online Learning, Nursing, Student ABSTRAK Pendidikan online adalah metode penyampaian pengetahuan yang memanfaatkan teknologi internet atau jaringan komputer. Motivasi mahasiswa dapat memengaruhi pembelajaran online, yang dapat mempengaruhi prestasi akademik mereka. Mahasiswa termotivasi untuk bertindak dalam mencapai tujuannya melalui motivasi dalam belajarnya, dimana keberhasilan akademik merupakan hasil dari tindakannya tersebut. Selain itu, terdapat perubahan metode pembelajaran menjadi full online learning karena adanya pandemik Covid-19, sehingga kemungkinan dapat memengaruhi motivasi mahasiswa dan prestasi akademiknya.Tujuan penelitian ini adalah untuk mengetahui hubungan antara motivasi dan prestasi belajar dalam online learning pada mahasiswa tingkat dua selama pandemi Covid-19 di satu universitas swasta. Penelitian kuantitatif korelasional dengan pendekatan cross-sectional. Populasi pada penelitian ini adalah seluruh mahasiswa tingkat dua berjumlah 337 orang. Teknik pengambilan sampel pada penelitian adalah simple random sampling. Pengumpulan data dilaksanakan pada bulan Januari-Maret 202. Data dianalisis dengan teknik univariat dan bivariat. Penelitian ini merekrut 201 mahasiswa tingkat dua. Penelitian ini menunjukkan bahwa terdapat hubungan yang signifikan antara motivasi mahasiswa dengan prestasi akademiknya (p-value = 0.025). Terdapat hubungan antara motivasi belajar dan prestasi belajar dalam online learning pada mahasiswa tingkat dua selama pandemi Covid-19 di satu universitas swasta. Mempertahankan motivasi yang tinggi sangat penting untuk pembelajaran online learning, terutama pada saat situasi pandemi Covid-19 saat ini. Sehingga, perlu strategi yang baik bagi pendidik maupun pembelajar untuk mempertahankan atau meningkatkan motivasi mahasiswa dan prestasi akademiknya. Kata kunci: Motivasi, Prestasi Akademik, Online Learning, Keperawatan, Mahasiswa
- Published
- 2022
21. Significant Differences in the Value of the Void Fraction in Various Types of Low-Viscosity Two-Phase Flow Patterns in Capillary Tubes with a Particular Slope
- Author
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null Sukamta, Wildan Zulkarnain, null Sudarja, Sri Sundari, and Mochamad Syamsiro
- Subjects
General Medicine - Abstract
A two-phase flow is the simplest form of multi-phase flow. Two-phase flow has basic parameters, including flow behavior, flow pattern, void fraction, pressure gradient, or pressure drop. The development and application of fluid flow in small channels (mini and micro) are in the Micro Electromechanical System (MEMS). In general, the application of two-phase flow can be found in various applications in the industrial world, such as boilers, cores, and steam generators in nuclear reactors, petroleum transportation, electronic cooling, and different other types of chemical reactors. One of the most common challenges is void fractions and flow patterns in horizontal and vertical pipelines. The purpose of this study was to find out the significant difference in the characteristic value of fundamental parameters, primarily void fractions and flow patterns that occur in capillary pipes with a slope of 15o to horizontal. The fraction value and shape of this flow pattern are essential because it determines the pressure drop value, which means determining the level of danger that can occur if the pressure drop value reaches the extreme value. The fluid used a mixture of air-water and glycerin with 0, 10, 20, and 30% concentrations. To determine the void fraction is used digital image processing method with MATLAB R2014a application. A 1200 fps high-speed camera and 640 x 480-pixel resolution are used for video shooting. The experiment was conducted at superficial gas (JG) velocities of 0.025 - 66.3 m/s and superficial fluid velocities (JG) intervals of 0.033 – 4.935 m/s. The experiment results showed a significant difference between the void fraction value for the bubbly flow pattern and the churn flow pattern, which has not been widely discussed in previous studies. The analysis concluded that the higher the velocity of superficial gases, the void fraction value increases. This increase in the void fraction is why there is a significant change in flow patterns from bubble flow patterns to churn. In addition, it was also found that the increased viscosity of the fluid significantly affected changes in flow patterns, incredibly bubbly and plug, but its velocity decreased. It is also the result that the higher homogeneous void fraction (β) value affects the increase in the length of bubbly flow patterns and plugs.
- Published
- 2022
22. MITIGASI TINDAKAN PLAGIAT DALAM PENULISAN KARYA ILMIAH DI SMK KATOLIK ST. MIKAEL SURAKARTA
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Sitorus, Jonter Pandapotan, primary, Purwanti, Christina, primary, Suteja, Hanna, primary, Puspita, C.Kiky, primary, and Sudarja, Kusman, primary
- Published
- 2022
- Full Text
- View/download PDF
23. Computational Fluid Dynamics of Two-Phase Flow Pressure Gradient of Air-Sodium Chloride and Glucose in Horizontal Capillary Channels
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null Sukamta, null Rama Putrantyo Anwar, null Sudarja, null Sri Sundari, and null Mochamad Syamsiro
- Abstract
One of the problems in the two-phase flow is investigating the type of flow pattern that occurs in a mini channel without experimenting first. Computational Fluid Dynamics (CFD) is one way that can be used to predict pressure drop, flow pattern, void fraction, other parameters in fluid flow through a channel of a specific size. This research used the CFD simulations to predict the pressure gradient in a two-phase flow of air-sodium chloride 0.9% and glucose in a horizontal capillary tube with a diameter of 1.6 mm, and length of 70 mm. This research aims to obtain the simulation results of 2D and 3D pressure gradients to validate the experimental data. The simulation was carried out with a variation of the superficial gas velocity 0.1 - 8.3 m / s against the superficial velocity of the liquid constant 0.207 m / s. Simulations were carried out using the Volume of Fluid (VOF) model with the "ANSYS Fluent 2020 R1" software. In 2D and 3D simulations, the gradient values of pressure gradients tend to increase as JG increases. The pressure gradient fluctuates linearly at first, then exponentially from mid-to-end. The findings demonstrate that simulations may properly model physical processes like pattern creation and phase interactions. However, due to several physical elements considered in 3D simulation but missed in 2D simulation, the findings of the 2D and 3D simulations were dramatically different when looking at the pressure gradient values.
- Published
- 2022
24. The Effect of Liquid Viscosity on The Gas-Liquid Two-Phase Flow Pattern in 45o Inclined Capillary Pipe
- Author
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Sudarja Sudarja, Sukamta Sukamta, Deendarlianto Deendarlianto, and Indarto Indarto
- Subjects
Fluid Flow and Transfer Processes - Published
- 2020
25. FASILITASI RINTISAN PEMBANGUNAN PONDOK INAP DAN PAVINGISASI AREA PANGGUNG HALAMAN PESANTREN PEMBERDAYAAN LANSIA MUKTI MULIA
- Author
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Wahyu Widodo and Sudarja Sudarja
- Subjects
General Medicine - Abstract
Pesantren Pemberdayaan Lansia Mukti Mulia (PPL MM) Bakungan, Wedomartani, Ngemplak, Sleman saat ini bermaksud membangun pondok inap. Akan tetapi kompetensi para pengurus dalam hal teknik bangunan masih sangat kurang. Di sisi lain, halaman PPL MM belum memiliki area panggung. Seluruh halaman masih dengan ketinggian yang sama, sehingga tidak representative untuk pemateri pengajian, instruktur senam, maupun untuk pentas anak-anak PAUD. Tujuan dari pengabdian ini adalah tersedianya area panggung yang dikeraskan dengan paving block serta tersusunnya gambar bangunan pondok inap. Program ini dilaksanakan dengan tahapan: koordinasi tim pengabdian dengan pengurus PPL MM, pendampingan penyusunan gambar denah dan gambar 3D untuk pondok inap (bangunan 2 lantai), pendampingan penyusunan RAB, penyiapan area panggung (pengurugan), persiapan pavingisasi, pemasangan paving block, serah terima barang, penyusunan laporan, dan publikasi. Seluruh aktifitas yang dirancang berjalan dengan lancar. Di halaman PPL MM saat ini terdapat area panggung seluas 64 m2, dengan elevasi 40 cm terhadap permukaan halaman, serta diperkeras dengan paving block. Di samping itu, juga sudah didapatkan gambar rencana pembangunan pondok inap, berupa gambar denah 2 dimensi dan gambar 3 dimensi. Bangunan adalah Gedung 2 lantai dengan luas tapak bangunan sekitar 150 m2. Seluruh pengurus dan anggota PPL MM merasa sangat puas terhadap proses dan hasil pengabdian ini.
- Published
- 2022
26. PENINGKATAN KUALITAS SARANA PENTAS DENGAN PANGGUNG PORTABEL
- Author
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Sudarja Sudarja and Wahyudi Wahyudi
- Subjects
General Medicine - Abstract
Permasalahan utama yang dihadapi Pesantren Pemberdayaan lansia (PPL) Mukti Mulia (MM) Bakungan, Wedomartani, Ngemplak, Sleman saat ini adalah tidak adanya panggung portable. Selama ini penceramah pengajian, instruktur senam, dan pentas PAUD dilakukan di tempat yang ketinggiannya sama dengan halaman, sehingga acara terasa kurang semarak. Sehubungan dengan hal tersebut, dilakukan pengadaan panggung portable dengan pendampingan dari tim pengabdian kepada masyarakat dari UMY. Tahapan tahapan pelaksanaannya meliputi pembuatan gambar panggung dua dan tiga dimensi. Selanjutnya pengadaan bahan berupa besi stal hollow, pemotongan, las titik (tack welding), las penuh, pebersihan dan penghalusan dengan gerinda dan amplas, serta pengecatan. Langkah berikutnya adalah pemasangan multipleks mranti, pengecatan, dan pemberian tulisan atau label. Pembuatan panggung dilakukan oleh bengkel las “Dadi Mandiri” yang merupakan binaan dari Tim Pengabdian UMY juga. Saat ini pembuatan panggung sudah selesai. Panggung terdiri dari 6 modul, masing-masing berukuran 2,4 m x 1,2 m x 0,4 m, sehingga totalnya menjadi satu kesatuan panggung dengan ukuran 4,8 m x 3,6 m x 0,4 m. Panggung tersebut sudah siap digunakan untuk pemateri pengajian, instruktur senam, dan pentas anak- anak PAUD Mukti Mulia. Dalam kondisi tidak terpakai, panggung dapat disusun ringkas, sehingga tidak banyak memakan tempat. Seluruh pengurus dan anggota PPL Mukti Mulia merasa sangat puas dan berteima kasih.
- Published
- 2022
27. Void Fraction Features Using Image Processing on a Clear Capillary Pipe with a 45° Slope to The Horizontal Line of Two-Phase Air-Liquid Flow with High Viscosity
- Author
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Sudarja, Noviyanto, Sukamta, and Sri Sundari
- Subjects
Fluid Flow and Transfer Processes ,Materials science ,Capillary action ,Phase (matter) ,Liquid flow ,Image processing ,Mechanics ,Porosity ,Horizontal line test - Abstract
In supercomputer equipment, X-rays, satellite cryogenic cooling systems, and others, the two-phase flow phenomenon in mini channels are also used. A significant issue for them is the void fraction function induced by superficial velocity, fluid viscosity, and slope. This analysis's objective was to determine the characteristics of void fraction values on the bubble, plug, slug-annular, annular, churn in horizontal capillary pipes. The research was carried out on a mini-pipe with a diameter of 1.6 mm and a length of 130 mm, mounted at a horizontal angle of 45 degrees. A mixture of 40, 50, 60, and 70 percent air-pure water and glycerin concentrations is the fluid used. The flow pattern video was shot using a Nikon J4 camera with a speed of 1200 fps, gas speed (JG) at 2.5x10-2-66.3 m/s intervals, and fluid velocity (JL) at 3.3x10-2 - 4.935 m/s intervals. A digital image processing technique is used to calculate the value of a void fraction with the MATLAB R2014a and Microsoft Excel application software. This paper's new finding is that the value of the void fraction for bubbly flow indicates conditions that are not so stable and have a low value. The void fraction for plug flow tends to be close to 1 over a certain period; this is induced by the air cavity that almost fills the vessel, as shown by the effects of the image processing and the graphs the time series of voids. The void fraction has a value that fluctuates to a moderate value in the churn flow pattern.
- Published
- 2021
28. Investigation of Flow Pattern and Void Fraction of Air and Low Surface Tension Liquid in A 30° Inclined Small Pipe
- Author
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Sukamta, Sudarja, and Fauzan Saputra
- Subjects
Fluid Flow and Transfer Processes ,Surface tension ,Materials science ,Flow pattern ,Composite material ,Porosity - Abstract
Two-phase flow in the mini pipe is applied in wide fields. The most common of two-phase flow is a couple of gas and liquid. The essential properties of the liquid are density, viscosity, and surface tension. There are many variations of the flow direction, horizontal, incline, and vertical, in terms of orientation. The two-phase investigation of flow pattern and void fraction of air and low surface tension liquid in a 30° inclined small pipe has been carried out. Dry air was used as a gas phase, while the liquid was the mixture solution of distilled water and 3% (by volume) of butanol. Butanol addition aimed to decrease the surface tension, which became 42.9 millinewton/meter, instead of 71 mN/m when using distilled water. The test section was a 130 mm length, 1.6 mm inner diameter circular glass pipe. The rig used was equipped with the air compressor, pressure tank, high-speed camera, liquid flow meter, and gas flow meter. The liquid was fed to the test section by the pressurized tank, instead of directly pumped, to avoid pulsation. Ranges of gas and liquid superficial velocities were 0.025 – 66.3 m/s and 0.033 – 4,935 m/s, respectively. Flow patterns were obtained from the captured high-speed video. Meanwhile, the void fractions were acquired by image processing of the video. As a result, five distinctive flow patterns were observed: plug, slug-annular, churn, bubbly, and annular. The separated flow was absent. The change of the liquid surface tension affected the shifting of some transition boundary lines in the flow pattern map. The transition line between slug-annular and annular against churn flow was shifted to the lower side or toward lower JL when the liquid surface tension decreased. In short, the churn flow was easier to be formed when the liquid surface tension was lower.
- Published
- 2021
29. FASILITASI RINTISAN PEMBANGUNAN PONDOK INAP DAN PAVINGISASI AREA PANGGUNG HALAMAN PESANTREN PEMBERDAYAAN LANSIA MUKTI MULIA
- Author
-
Widodo, Wahyu, primary and Sudarja, Sudarja, additional
- Published
- 2022
- Full Text
- View/download PDF
30. The Significant Effect of Liquid Viscosity on Two-Phase Flow Pressure Gradient in Mini Channel with Slope of 15o against Horizontal
- Author
-
Sudarja Sudarja and Sukamta Sukamta
- Subjects
Physics::Fluid Dynamics ,Fluid Flow and Transfer Processes ,Pressure drop ,Viscosity ,Superficial velocity ,Materials science ,Capillary action ,Flow (psychology) ,Two-phase flow ,Mechanics ,Pressure sensor ,Pressure gradient - Abstract
Two-phase flow is found in daily life as well as in the field of industry, which consists of three phases, namely liquid-solid, gas-liquid, and gas-solid. The fundamental characteristics of two-phase flow include flow pattern and flow pattern maps, void fraction, and pressure gradient. Some problems related to the pressure gradient comprise of the superficial velocity and viscosity of fluid mixture flow. This research discussed the significant effect of liquid viscosity in two-phase flow pressure gradient to find out the influence of liquid velocity, and also both superficial gas velocity (JG) and liquid superficial velocity (JL) on the pressure gradient. This research used a capillary pipe with a diameter of 1.6 mm. The fluid used was a gas-water mixture and glycerin with a concentration of 40%, 50%, 60%, and 70%. The pressure drop was measured using a pressure transducer and recorded by data acquisition. The result showed that the value of the two-phase flow pressure gradient was affected significantly by the number of liquid viscosity. The higher liquid viscosity leads to an increase in the two-phase flow pressure gradient. The pressure gradient was also effected either by liquid or gas superficial velocity, namely, the higher the superficial velocity of either by liquid or gas, the higher the pressure gradient.
- Published
- 2020
31. Experimental Study on Two-Phase Flow of Gas-Liquid With High Viscosity in Capillary with the Slope of 5o against Horizontal Position
- Author
-
Endradi Roziantho, Sukamta Sukamta, and Sudarja Sudarja
- Subjects
Fluid Flow and Transfer Processes ,Materials science ,Capillary action ,Horizontal position representation ,Two-phase flow ,Mechanics - Published
- 2020
32. Cross-Matching VIIRS Boat Detections with Vessel Monitoring System Tracks in Indonesia.
- Author
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Feng-Chi Hsu, Christopher D. Elvidge, Kimberly E. Baugh, Mikhail N. Zhizhin, Tilottama Ghosh, David Kroodsma, Adi Susanto, Wiryawan Budy, Mochammad Riyanto, Ridwan Nurzeha, and Yeppi Sudarja
- Published
- 2019
- Full Text
- View/download PDF
33. MENDORONG PROSES MODERNISASI PERTANIAN KELOMPOK TANI 'SRI MULYO', SLEMAN
- Author
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Almudi Khurniawan, Gatot Supangkat, and Sudarja Sudarja
- Abstract
Kelompok Tani “Sri Mulyo” beralamat di Bakungan, Wedomartani, Ngemplak, Sleman, berjarak sekitar 20 km dari Universitas Muhammadiyah Yogyakarta (UMY) arah timur laut, dan jumlah anggotanya 77 orang. Permasalahan yang dihadapi saat ini adalah: pemahaman dan ketrampilan petani dalam mengatasi penyakit dan gulma tanaman masih kurang, alat semprot yang digunakan masih manual sehingga sangat melelahkan, sebagian petani masih merasa berat untuk membeli plastic mulsa, penanaman biji palawija masih dilakukan secara manual. Tujuan dari kegiatan Pengabdian kepada Masyarakat (PkM) ini adalah terjadinya peningkatan pengetahuan dan ketrampilan para anggota kelompok tani tentang budi daya pertanian secara umum dan khususnya dalam mengelola dan mengatasi penyakit dan gulma tanaman. Di samping itu juga untuk mendorong diterapkannya mekanisasi pertanian, sehingga meringankan beban pekerjaan petani. Dampak dari kegiatan PkM ini adalah meningkatnya pendapatan para anggota kelompok, sehingga meningkatkan kesejahteraan mereka. PkM dilaksanakan dengan urutan: diskusi awal dengan mitra, penyuluhan tentang penanggulangan hama, penyakit, dan gulma khususnya pada tanaman cabai, hibah peralatan pertanian (mulsa plastic, alat semprot elektris, alat bantu tanam biji palawija), penjelasan tentang penggunaan peralatan pertanian semi otomatis yang dihibahkan, dan publikasi. Semua kegiatan PkM dilaksanakan dengan baik, sesuai skedul. Terjadi peningkatan pemahaman anggota kelompok tentang penanggulangan hama dan penyakit tanaman, serta mekanisasi pertanian. Ketua kelompok dan seluruh anggota merasa puas terhadap pelaksanaan pengabdian ini, serta menyampaikan apresiasi kepada tim pengabdian UMY. PkM ini diharapkan dapat meningkatkan income anggota kelompok. PkM ini menghasilkan publikasi ilmiah di prosiding seminar nasional, publikasi di media massa online, dan publikasi di canal youtube.
- Published
- 2022
34. Karakteristik Pola Aliran Air-Udara, Campuran Air+Gliserin (G20)-Udara, dan Campuran Akuades+Butanol 4%-Udara Pada Pipa Horizontal Berukuran Mini
- Author
-
Farid Jayadi, Sudarja Sudarja, and Eli Komolosari
- Subjects
General Medicine - Abstract
This study aims to obtain information about the flow characteristics of Water-Air Flow, Mixture of Glycerin+Water(G20)-Air, and Mixture of Aquadest+Butanol 4%-Air. The two-phase flow characteristics in mini-sized pipes have significant differences with the two-phase flow characteristics in conventional pipes, so it will affect fluid distribution processes involving two-phase flow such as heat transfer processes. Therefore, it is necessary to conduct further studies on the two-phase flow pattern in mini-sized pipes. This research was conducted in a test section in the form of a glass pipe with a diameter of 1.6 mm in a horizontal position. The liquid fluid used is water which has a surface tension (σ) of 71 mN/m, a mixture of glycerin+water (G20) has a surface tension (σ) of 62.5 mN/m, and a mixture of distilled water+butanol 4% has a surface tension (σ) of 36.50 mN/m. Superficial velocity of gas (JG)=0.033–4.935 m/s, and superficial velocity of liquid (JL)=0.025–66.3 m/s. The results showed that stratified flow was not observed in the mini channel as can be found in conventional pipes. The detected flow patterns are: bubbly, slug, slug-annular, churn, and annular. The results of flow pattern maps compared with flow pattern maps from Triplett et al (1999a), Chung and Kawaji (2004) and Sudarja et al (2014), and Aqli et al (2015) show that the higher the viscosity, the higher the annular churn-slug flow transition line will be. decreases while the annular – slug annular transition line tends to be more sloping.
- Published
- 2022
35. Hubungan Motivasi Dan Prestasi Akademik Mahasiswa Keperawatan Saat Pembelajaran Daring Pada Situasi Pandemi Covid-19
- Author
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Yobi, Indira, primary, Nababan, Juana Ivory, additional, Fua, Risnariani Irmayanti, additional, Eka, Ni Gusti Ayu, additional, and Sudarja, Kusman, additional
- Published
- 2022
- Full Text
- View/download PDF
36. Peningkatan Kapasitas Dan Kualitas Layanan Bengkel Las Dan Cat Mobil 'Dadi Mandiri' Di Dusun Bakungan, Wedomartani, Ngemplak, Sleman
- Author
-
Sudarja Sudarja
- Subjects
General Medicine - Abstract
Bengkel “Dadi Mandiri” (mitra) didirikan pada tahun 2009. Bengkel ini beralamat di Dusun Bakungan,Wedomartani, Ngemplak, Sleman. Posisi bengkel ini berada di pinggir jalan gang di dalam dusun, bukandi pinggir jalan raya. Pekerjaan yang dapat dikerjakan/dilayani di bengkel saat ini adalah auto bodyrepair dan poles bodi kendaraan. Permasalahan utama yang dihadapi mitra antara lain adalah:kapasitas bengkel rendah sehingga tidak dapat menerima pekerjaan/order dalam jumlah besar, kualitaspekerjaan belum sepenuhnya memuaskan pelanggan, masih sering mendapatkan complain dari customer,sumber daya manusia (SDM) yang bekerja di bengkel ini belum sepenuhnya menguasai ilmu yangberkaitan dengan pekerjaannya (metalurgi, teknik pengelasan, dan perlakuan permukaan logam), sertamanajemen bengkel kurang memadai. Kondisi-kondisi tersebut menyebabkan terbatasnya jumlahpelanggan dan tidak optimalnya pekerjaan di bengkel. Solusi yang ditawarkan untuk Bengkel “DadiMandiri” adalah: peningkatan kapasitas bengkel dengan cara upgrading dan diversifikasi peralatan kerja,upgrading kemampuan SDM dengan meberikan berbagai pelatihan, peningkatan kualitas manajemenbengkel. Program Pengabdian kepada Masyarakat ini dilaksanakan dengan tahapan: koordinasi denganmitra (pemilik bengkel), peningkatan kapasitas bengkel dengan cara upgrading dan diversifikasi peralatankerja, upgrading kemampuan SDM, peningkatan kualitas pemasaran, penyusunan laporan kegiatan,publikasi ilmiah.Luaran dan dampak dari program ini adalah terjadinya transfer of knowledge tentanghal-hal yang berkaitan dengan perbengkelan dari Tim Pengabdian kepada mitra, terjadinya peningkatankualitas pekerjaan di bengkel “Dadi Mandiri”, meningkatnya income bengkel, serta publikasi ilmiah daripelaksanaan program ini.
- Published
- 2021
37. Pembuatan Website Sebagai Langkah Awal Terwujudnya Smart Village Di Dusun Bakungan, Wedomartani, Ngemplak, Sleman
- Author
-
Sudarja Sudarja and Wahyudi Wahyudi
- Subjects
Political science ,General Medicine ,Humanities - Abstract
Dusun Bakungan, masuk dalam wilayah Kalurahan Wedomartani, Kecamatan Ngemplak,Kabupaten Sleman, termasuk dusun dengan potensi sumber daya alam (SDA) maupun potensi sumberdaya manusia (SDM) yang baik. Permasalahan yang dihadapi dusun ini antara lain adalah: Informasidan data-data dusun belum tersosialisasi dengan baik kepada masyarakat, pelaku usaha mengalamikesulitan dalam memasarkan produk atau jasanya, serta masyarakat belum memanfaatkan teknologiyang ada secara optimal. Dari kondisi dusun tersebut, maka solusi yang tawarkan adalah pemanfaatanfasilitas internet secara optimal, dalam hal ini berupa pembuatan dan pemanfaatan website dusun.Untuk mewujudkan penyusunan dan pemanfaatan website dengan baik, langkah-langkah yang dilakukan antara lain: koordinasi dengan kepala dukuh dan perangkatnya, koordinasi dengan elemen-elemen masyarakat, pelatihan pembuatan website, pembuatan website, pemeliharaan dan updating konten. Luaran dan dampak dari program ini adalah terjadinya transfer of knowledge tentang hal-halyang berkaitan dengan internet, khususnya website, terbangunnya website Dusun Bakungan,terbangunnya konten-konten di website yang bermanfaat untuk warga Dusun Bakungan maupun untukmasyarakat pada umumnya.
- Published
- 2021
38. PENINGKATAN KUALITAS LAYANAN PPL 'MUKTI MULIA' DI BAKUNGAN, WEDOMARTANI, SLEMAN
- Author
-
Sudarja Sudarja and Wahyu Widodo
- Subjects
General Medicine - Abstract
Sekitar 24 % dari jumlah penghuni Dusun Bakungan, Wedomartani, Ngemplak, Sleman merupakan penduduk dengan golongan usia pra-lansia dan lansia (lanjut usia) maka di Pedukuhan tersebut didirikan Pesantren Pemberdayaan Lansia (PPL) “Mukti Mulia”. Kegiatan yang dilaksanakan meliputi: senam dan jalan sehat, syi’iran, asmaulhusna, pengajian, pemeriksaan kesehatan, iqra, tabungan infak rumah tangga (tabinruta), pemberian makanan tambahan, manasik haji, dan pelatihan perawatan jenazah (PPJ). Permasalahan-permasalahan utama yang dihadapi mitra antara lain adalah pengetahuan dan keterampilan pengurus PPL “Mukti Mulia” dalam menggunakan komputer masih sangat kurang, drainase belum tertata dengan baik, kondisi fisik lantai halaman yang digunakan untuk kegiatan masih sangat kurang memadai. Oleh karena itu, PPL ini sangat membutuhkan pendampingan dari akademisi, dalam bentuk pengabdian kepada masyarakat. Program Pengabdian masyarakat ini dilaksanakan dengan tahapan-tahapan, antara lain: koordinasi dengan pengurus, pengenalan dan pelatihan Microsoft Excel sederhana untuk pembukuan, perencanaan dan perbaikan drainase, perencanaan dan pemasangan paving block, penyusunan laporan kegiatan, dan publikasi ilmiah. Luaran dari program ini adalah terjadinya transfer of knowledge tentang cara pembukuan, peningkatan kualitas sarana dan prasarana kegiatan (pengaturan drainase dan pavingisasi lantai halaman). Dampak dari pengabdian ini adalah meningkatnya kepuasan pengguna.
- Published
- 2021
39. PENDAMPINGAN BUDIDAYA PERTANIAN KELOMPOK TANI SRI MULYO BAKUNGAN, WEDOMARTANI, NGEMPLAK, SLEMAN
- Author
-
Sudarja Sudarja, Wahyudi, and Gatot Supangkat
- Subjects
General Medicine - Abstract
Wilayah Dusun Bakungan, Wedomartani, Ngemplak, Sleman terdiri atas pemukiman dan wilayahpersawahan. Di wilayah persawahan terdapat sistem pengairan yang dapat berfungsi dengan sangat baik,yaitu saluran sekunder dan saluran tersier, sehingga petani tidak pernah kekurangan air di musimkemarau, namun di musim hujan air juga masih terkendali. Di dusun ini terdapat sebuah kelompok tanibernama “Sri Mulyo” yang saat ini beranggotakan 77 orang anggota petani dan seluruhnya warga DusunBakungan. Permasalahan-permasalahan utama yang dihadapi mitra antara lain adalah kemampuanmanajemen pengurus kelompok masih perlu ditingkatkan, pengetahuan dan pemahaman mitra tentangteknologi budidaya pertanian masih kurang memadai, petani masih melakukan sebagian kegiatanpertanian secara manual, belum menggunakan teknologi yang tepat. Program pengabdian kepadamasyarakat ini dilaksanakan dengan tahapan: peningkatan kemampuan manajerial pengurus (terutamadalam hal pembukuan), peningkatan pengetahuan mitra dalam hal budidaya pertanian, peningkatanpemahaman mitra dalam hal mekanisasi budidaya pertanian. Luaran dari program ini adalah terjadinyatransfer of knowledge dalam bidang pengelolaan keuangan, manajemen lahan, dan penanggulangan OPT,serta penambahan alat mekanisasi pertanian berupa cultivator. Adapun dampaknya adalah efektivitaskegiatan pertanian, efisiensi sumber daya pertanian, kepuasan anggota kelompok tani “Sri Mulyo”, danakhirnya akan bermuara pada peningkatan income anggota kelompok yang dapat meningkatkan tingkatkesejahteraan mereka.
- Published
- 2021
40. PENINGKATAN PENDAPATAN KELOMPOK PENGRAJIN ARANG BATOK KELAPA MAJU ADIL MAKMUR MELALUI PRODUKSI ASAP CAIR BERKUALITAS TINGGI UNTUK MENDUKUNG PROGRAM BIOGASOLINE
- Author
-
Cahya Tresna Pradana, Sukamta Sukamta, Sudarja Sudarja, and Syamsiro Syamsiro
- Subjects
General Medicine - Abstract
Kelompok pengrajin arang batok kelapa “Maju Adil Makmur” yang berada di Dusun Murangan 7, Desa Triharjo, Kecamatan Sleman, Kabupaten Sleman, Daerah Istimewa Yogyakarta. Permasalahan utama yang dihadapi adalah asap yang dihasilkan dari proses produksi ini berpotensi mengganggu lingkungan karena jumlahnya yang banyak. Untuk itulah maka dikembangkan metode destilasi yang memproses asap menjadi cairan, yang kemudian disebut asap cair. Namun demikian, asap cair yang dihasilkan masih bercampur dengan abu (fly ash), sehingga harganya rendah. Oleh karena itu, telah dilakukan proses pengolahan kembali asap cair tersebut dengan metode destilasi tingkat lanjut untuk menghasilkan asap cair kualitas tinggi (grade A) sehingga harganya meningkat. Hasilnya, pengerajin mampu menghasilkan asap cair dengan kualitas yang jauh lebih baik daripada sebelumnya. Jika sebelumnya asap cair yang dihasilkan hanya mampu dijual dengan harga Rp 6.000,00 per liter, setelah dilakukan proses destilasi tingkat lanjut maka dihasilkan asap cair kualitas tinggi yang dinamakan grade A, dan mampu dijual dengan harga Rp 28.000,00 per liter atau telah mengalami peningkatan pendapatan yang cukup signifikan yaitu sebesar 4 kali lebih besar.
- Published
- 2021
41. THE INVESTIGATION OF VOID FRACTION OF TWO-PHASE FLOW AIR-WATER AND GLYCERINE (0-30%) IN THE CAPILLARY PIPE WITH SLOPE OF 50 TO HORIZONTAL POSITION
- Author
-
Sudarja Sudarja, Aldi Rahadian Ilham, and Sukamta Sukamta
- Subjects
Viscosity ,Materials science ,law ,Heat exchanger ,Flow (psychology) ,Fluid dynamics ,Working fluid ,Two-phase flow ,Mechanics ,Spark plug ,Porosity ,law.invention - Abstract
Two-phase flow is a flow that is composed of two combined substances, i.e., liquid and gas. Two-phase flow phenomena can be a lot encountered in nature, for example, exhaust gas smoke, fog, rain, cloud, snow, and so forth. Moreover, in the practice of company or industry environment, the flow of the two phases can be encountered on the equipment in the form of heat exchangers, boilers, nuclear reactors, piping systems, geothermal, natural gas liquefaction, and others. Data collection in this research was carried out in 4 stages (from working fluid), namely: air-water, air-water+0% glycerin, air-water+10% glycerin, air-water+20% glycerin, and air-water+30% glycerin. The research aims to determine the void fraction by using the method of digital image processing with the software MATLAB R2014a. Based on the research results, it was obtained that when superficial gas velocity high then, the value of the void fraction obtained will increase, otherwise the higher speed of the superficial liquid then, the value of void fraction that is retrieved will decrease. The viscosity of the fluid very influenced the flow pattern bubbly and plug. It is because the higher the viscosity of fluid flow pattern speed then, the bubbly and the plug will increasingly decline, instead of getting down viscosity makes bubbly flow pattern speed, and the plug will progressively increase. The length of the bubbly and plug pattern is affected by the increasing value of homogeneous (β). As a consequence, the length of the pattern increases. In the frequency when the bubbly and plug occurred, it was obtained a high enough rate that led to the value of the void fraction generated considerable increases.Keyword: two-phase, fluid, void fraction, viscosity, flow pattern.
- Published
- 2019
42. Fraksi Hampa Campuran Gliserin-Air dan Udara Pada Pipa Horizontal Berukuran Mini
- Author
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Farid Jayadi, null Sudarja, null Wenang, null Indarto, and null Deendarlianto
- Abstract
Penelitian ini bertujuan untuk mendapatkan informasi tentang karakteristik aliran air-udara. Salah satu karakteristik yang penting dalam aliran dua fasa adalah Fraksi hampa. Penelitian ini dilakukan pada seksi uji berupa pipa kaca dengan diameter 1,6 mm posisi horisontal. Fluida yang digunakan adalah air-udara dan campuran air-gliserin dengan konsentrasi 20%. Kecepatan superfisial gas (JG)=0,033 – 4,935 m/s, dan kecepatan superfisial cairan (JL)=0,025 – 66,3 m/s. Data fraksi hampa diperoleh dari pengambilan gambar pada seksi uji menggunakan kamera berkecepatan tinggi. Hasil penelitian menunjukkan bahwa hubungan antara pola aliran dan fraksi hampa sangatlah berpengaruh didalam menentukan karakteristik aliran dua fasa. Pola aliran bubbly dan slug, fraksi hampanya meningkat dengan meningkatnya JG. Fraksi hampa yang diukur adalah sama atau lebih besar dari fraksi hampa homogen. Pola aliran churn, slug-annular, dan annular, tidak ada hubungan yang jelas antara JG dan fraksi hampa diamati ketika JG meningkat, karena tingginya slip rasio antara gas dan cairan. Pembuktian bahwa, untuk aliran bubbly dan slug, fraksi hampa dekat dengan garis homogen, sedangkan untuk aliran churn, annular, dan slug-annular yang jauh di bawah garis homogen. Ini menunjukkan bahwa rasio slip untuk kelompok kedua pola aliran lebih tinggi daripada 1
- Published
- 2020
43. Correlation between Void Fraction and Two-Phase Flow Pattern Air-Water with Low Viscosity in Mini Channel with Slope 30 Degrees
- Author
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Sudarja and Sukamta
- Subjects
Materials science ,Mechanical Engineering ,02 engineering and technology ,Mechanics ,Flow pattern ,01 natural sciences ,010305 fluids & plasmas ,Viscosity ,020401 chemical engineering ,Mechanics of Materials ,0103 physical sciences ,Air water ,General Materials Science ,Two-phase flow ,0204 chemical engineering ,Porosity ,Communication channel - Abstract
Two-phase flow has been used in so many industrial processes, such as boilers, reactors, heat exchangers, geothermal and others. Some parameters which need to be studied include flow patterns, void fractions, and pressure changes. Research on void fractions aims to determine the composition of the gas and liquid phases that will affect the nature and value of the flow property. The purpose of this study is to find out the characteristics of the void fraction of various patterns that occurs and to determine the characteristics of the velocity, length, and frequency of bubbly and plug. Data acquisition was used to convert the data from analog to digital so that it can be recorded, stored, processed, and analyzed. High-speed camera Nikon type J4 was used to record the flow. The condition of the study was adiabatic with variation of superficial gas velocity (JG), superficial fluid velocity (JL), and also working fluid. To determine the void fraction by using the digital image processing method. The results of the study found that the flow patterns which occurred in this study were bubbly, plug, annular, slug-annular and churn flows. It also showed that the void fraction value is determined by the superficial velocity of the liquid and air. The higher the superficial velocity of the air, the lower the void fraction value.
- Published
- 2020
44. Pembuatan Website Sebagai Langkah Awal Terwujudnya Smart Village Di Dusun Bakungan, Wedomartani, Ngemplak, Sleman
- Author
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Wahyudi, Wahyudi, primary and Sudarja, Sudarja, additional
- Published
- 2021
- Full Text
- View/download PDF
45. PENINGKATAN KUALITAS LAYANAN PPL “MUKTI MULIA” DI BAKUNGAN, WEDOMARTANI, SLEMAN
- Author
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Widodo, Wahyu, primary and Sudarja, Sudarja, additional
- Published
- 2021
- Full Text
- View/download PDF
46. PENINGKATAN PENDAPATAN KELOMPOK PENGRAJIN ARANG BATOK KELAPA MAJU ADIL MAKMUR MELALUI PRODUKSI ASAP CAIR BERKUALITAS TINGGI UNTUK MENDUKUNG PROGRAM BIOGASOLINE
- Author
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Sukamta, Sukamta, primary, Sudarja, Sudarja, additional, Pradana, Cahya Tresna, additional, and Syamsiro, Syamsiro, additional
- Published
- 2021
- Full Text
- View/download PDF
47. The effect of conidia density and application frequency of the entomopathogenic fungus Aschersonia aleyrodis in controlling silverleaf whitefly (Bemisia tabaci) on tomato (Solanum lycopersicum Linnaeus)
- Author
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Sudarjat, Fitri Widiantini, Yula Salsabila, and Syariful Mubarok
- Subjects
population suppression ,mycosis ,mummification ,biological control ,Plant culture ,SB1-1110 - Abstract
One of several important pests that attack tomato plants is the silverleaf whitefly (Bemisia tabaci) (Hemiptera: Aleyrodidae). An eco-friendly method to control B. tabaci utilizes the entomopathogenic fungus, namely Aschersonia aleyrodis. This study aimed to determine the effect of A. aleyrodis conidia density and the frequency of its application to control silverleaf whitefly (B. tabaci) pest on tomato plants under screen house conditions. This study used a randomized completely block design (RCBD) to test ten combination treatments. Each treatment was repeated three times. The results showed that application of A. aleyrodis at conidia densities of 106 conidia/mL, 107 conidia/mL, and 108 conidia/mL with an application frequency of up to once every three weeks was still effective in controlling B. tabaci populations on tomato plants. The highest population suppression rates for B. tabaci (90.6%), tomato yield (1 009 g/plant and 16 fruits/plant), percentage of mycosis (96.6%), and percentage of mummification (97.3%) were found to occur at a conidia density of 108 conidia/mL with the application frequency of once a week.
- Published
- 2024
- Full Text
- View/download PDF
48. A void fraction of high-viscosity air-water flow in capillary pipes with a slope of 30 degrees to the horizontal positio
- Author
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Metra Prayogi Rianda, Sudarja Sudarja, and Sukamta Sukamta
- Subjects
Physics::Fluid Dynamics ,Viscosity ,Superficial velocity ,Plug flow ,Materials science ,Capillary action ,lcsh:Mechanical engineering and machinery ,Bubble ,Heat exchanger ,Working fluid ,lcsh:TJ1-1570 ,Mechanics ,Porosity - Abstract
Two-phase flow is a flow that is composed of several combined substances, namely liquid and gas. Two-phase flow is found in industrial processes, such as in boiler systems, reactors, heat exchangers, geothermal and others. The phenomenon of two-phase flow is also often found in nature, such as fog, snow, clouds, and rain. The purpose of this study was to obtain the characteristics, length, and frequency of flow patterns in two phases based on the experimental value of the fraction in a two-phase flow of a mixture of water-glycerin and air in a capillary tube with a slope of 30˚. The study used a 1.6 mm diameter capillary tube with a working fluid which mixed air and water mixed with glycerin with glycerin concentrations of 40%, 50%, 60%, and 70%. Void fraction values were analyzed using digital image processing methods with the MATLAB R2014a application program. The results showed that the void fraction value was determined by the surface velocity of the liquid and air. The greater the superficial air velocity, the value of the vacuum fraction will develop, while the greater the superficial velocity of the liquid, the vacuum fraction will decrease. The flow pattern of bubbles and plugs is strongly influenced by fluid viscosity. Therefore the higher the viscosity, the velocity of the bubble and plug flow patterns will decrease, conversely if the viscosity of the fluid decreases, the velocity of the bubble and plug flow patterns will increase. The length and flow of the bubble pattern are strongly influenced by homogeneous values (β). If the homogeneous value (β) is higher then the length of the flow pattern will increase. In the stopper flow pattern obtained a high enough frequency, it will produce a high enough void fraction value. Keywords: Two-phase, fluid, void fraction, viscosity, flow pattern.
- Published
- 2020
49. Perilaku Antarmuka Berdasarkan Data Beda Tekanan pada Peristiwa Kondensasi Aliran Uap Dengan Pendinginan dari Luar Searah pada Pipa Horisontal Berbasis Domain Waktu
- Author
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Hasan Asy Ari Dwiearto, Sudarja Sudarja, and Sukamta Sukamta
- Subjects
geography ,Materials science ,geography.geographical_feature_category ,Superficial velocity ,Annulus (oil well) ,Condensation ,education ,Mechanics ,Differential pressure ,Flow pattern ,Inlet ,Engineering (General). Civil engineering (General) ,two-phase flow, condensation, steam-condensate, differential pressure, horizontal pipe ,TJ1-1570 ,Two-phase flow ,Mechanical engineering and machinery ,Stratified flow ,TA1-2040 - Abstract
A two-phase flow pattern experiment on the condensation event of steam flow with external cooling based on the measurement of pressure difference within a horizontal pipe is carried out by varying the superficial velocity. Annulus pipes with inner pipe material made of copper and outer pipe made of galvanized iron (GIP) within an insulation of 10 mm thick were used in this experiment. The length of the pipe is 1.6 meters, outer diameter of 4 inch and inner diameter of 17 mm. The two-phase flow pattern was investigated based on differential pressure fluctuations between the inlet and outlet. To support the observation, flow pattern visualization was performed using a transparent pipe with a diameter of ¾ inch and a length of 1.3 meters connected to the test pipe section. The superficial vapor velocity was carried out from JG = 0.0689 m/s to JG = 1,9117 m/s. The results showed stratified flow patterns for the lowest superficial velocity and also obtained wavy, wavy-slug, and slug. Annular flow patterns can not be observed in this experiment. In general, increasing superficial velocity of steam will cause a significant increase in pressure fluctuations.
- Published
- 2018
50. TEMPERATURE PROFILES ON MULTI-LOCATION OF STEAM FLOW CONDENSATION COOLED USING PARALLEL FLOWING WATER IN THE OUTSIDE OF A HORIZONTAL PIPE
- Author
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Sukamta and Sudarja
- Subjects
Materials science ,Mechanical Engineering ,Condensation ,Steam flow ,Mechanics - Published
- 2019
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