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• Semi-empirical models for suction flow rate, injection flow rate, input power consumption, and discharge temperature are proposed for scroll compressors with vapor injection. • The modeling approach can be consistently applied to fixed-speed and variable-speed compressors. • The models were fit and evaluated using a data set containing four compressors. The prediction accuracy is similar to other proposed models and the model requires relatively low testing effort to fit the empirical parameters. • The models were applied to one compressor for operation with and without vapor injection. The prediction errors for both modes of operation are similar, while only using one set of model parameters. Semi-empirical models for predicting the suction flow rate, injection flow rate, input power consumption, and discharge temperature are proposed for scroll compressors with vapor injection. A data set containing four compressors wherein each compressor was tested over a range of operating conditions is used to evaluate the models. The fitted parameters of the models and the prediction errors of each data set are discussed. The accuracy and generalizability of applying the models to the same compressor with and without vapor injection are also discussed. [ABSTRACT FROM AUTHOR]

The Zagros Mountain range channels a significant volume of water towards the Persian Gulf basin due to the presence of gorges, diverting it from a potential southeast trajectory parallel to the Zagros folds. This study aimed to assess the water flow through the Zagros straits, utilizing 1:50,000 topographic and 1:100,000 geological maps, Iran's Digital Elevation Model (DEM), and various library sources. Hydrometric stations were used as the starting point and their associated sub-basins were delineated. The relationship between precipitation and elevation in each basin was analyzed to extract the precipitation layer of each sub-basin and calculate its average precipitation. Considering the sub-basin areas, the precipitation amount over a specific period was estimated and compared with the recorded discharges. The findings revealed that approximately 110,695 billion cubic meters of water were channeled to the Persian Gulf via the tidal currents of the Zagros Mountains. Notably, the sub-basins with lower discharge relative to the received precipitation, including Gilvan, Simre, Sartang Dolab, Qara Aghaj, and Dez, were situated to the east of the Zagros main thrust, while those with higher discharge were located to the west. This disparity in discharge on either side of the Zagros main thrust could be attributed to various mountain features, such as land surface slope, position in relation to incoming streams, karst, and faulting [ABSTRACT FROM AUTHOR]

Copyright of Ankara Üniversitesi Dil ve Tarih-Cografya Fakültesi Dergisi DTCF Dergisi is the property of Ankara Universitesi Dil ve Tarih-Cografya Fakultesi (DTCF Dergisi) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

• Semi-empirical models for flow rate, input power consumption, and discharge temperature are proposed for positive displacement compressors. • The modeling approach can be consistently applied to fixed-speed and variable-speed compressors. • The models were fit and evaluated using an extensive data set containing twenty-six combinations of compressor and refrigerant pairs. • A comparison of the fitted model parameters suggest that the model can be used to approximate compressor performance with different refrigerants. • Less experimental test data is required to fit the proposed model than is need for the AHRI 10-coefficient polynomial model. Semi-empirical models for predicting the suction flow rate, input power, and discharge temperature are proposed for positive displacement compressors. A data set containing twenty-six combinations of compressors and refrigerant pairs wherein each compressor was tested over a wide range of operating conditions is used to evaluate the models. The model fitted parameters and prediction errors of each data set is discussed. [ABSTRACT FROM AUTHOR]

• The prediction accuracies of a semi-empirical modeling approach and the AHRI polynomial modeling approach are compared. • A data set containing twenty-six combinations of compressors and refrigerant pairs wherein each compressor was tested over a wide range of operating conditions is used to evaluate the models. • The model parameters were fit using all the data from each data set, as well as smaller subsets of data using a resampling approach. • The semi-empirical model showed more consistent prediction errors when fewer data points were used to fit the model. • The AHRI polynomial model is unsuitable for predicting the discharge temperature of a compressor when variations in suction superheat are present. A semi-empirical model has been proposed to predict the refrigerant mass flow rate, input power, and discharge temperature of positive displacement compressors. The prediction accuracy of the proposed model is compared with the accuracy of the AHRI polynomial model. To examine the generalizability of the models, a resampling methodology is used to compare prediction accuracy that results when smaller data sets are used to fit the models. These results show that the semi-empirical model has similar mass flow rate and input power prediction errors to the AHRI polynomial model and results in more consistent performance when smaller data sets are used to fit the model. The results also show that the AHRI polynomial is not a good choice for the prediction of discharge temperature and that the proposed model is much more suitable for this purpose. [ABSTRACT FROM AUTHOR]

Copyright of Jurnal Teknologi dan Rekayasa Sumber Daya Air is the property of Brawijaya University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Indonesian Civil & Environmental Engineering / Jurnal Teknik Sipil & Lingkungan is the property of IPB University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Perubahan tataguna lahan yang memberikan dampak langsung terhadap peningkatan aliran permukaan dan menurunnya peresapan air ke dalam tanah, yang berakibat banjir dan kurangnya air tanah. Pengembalian air ke dalam tanah dengan cara biopori bisa juga menggunakan metode sumur resapan dan pipa resapan horisontal. Analisa kebutuhan pipa resapan horisontal menggunakan dua metode yaitu metode Hidrograf dan metode Rasional. Dengan menggunakan pipa horisontal dinding berlubang panjang 4 m akan menggunakan pipa diameter 6". Debit banjir yang dipasang adalah debit banjir hidrograf dengan metode Gama I. Debit banjir periode ulang 50 tahun adalah Debit tahun 2007 = 11,43 m³/detik, Debit tahun 2023 sebelum dipasang PRH = 15,36 m³/detik, Debit tahun 2023 setelah dipasang PRH = 11,31 m³/detik. Analisa reduksi banjir yang digunakan adalah reduksi banjir hidrograf dengan metode Gama I sebesar 8,55 m³/detik, dan dibutuhkan pipa resapan horisontal sebanyak 1650 unit

RÉSUMÉLa quantification des incertitudes des données hydrométriques (mesure de débit des cours d’eau) est reconnue comme indispensable mais sa mise en œuvre pratique nécessite un ensemble d’outils adaptés au traitement des mesures sur l’ensemble d’une chaîne complexe allant des mesures de terrain (jaugeages, limnigrammes) aux hydrogrammes, en passant par les courbes de tarage. Nous présentons plusieurs méthodes et outils logiciels développés ces vingt dernières années et intégrés dans les pratiques des hydromètres en France. L’incertitude plus forte des débits de crue est un des défis à relever. Outre la poursuite des développements méthodologiques, une réflexion sur la communication et la bancarisation des incertitudes est à entreprendre.

Various factors affect the waiting time for patient discharge, starting from human factors, processes to systems. The waiting time for the process of returning inpatients at Hospital X is still a problem of dissatisfaction with patient feedback every month, even including the 5 highest complaints in 2021. The main objective of this study is to elaborate and examine the factors that influence the waiting time for patient discharge according to Permenkes No: 129/Menkes/SK/II/2008. This research is a retrospective analytic study on a population of 2,917 inpatients at Hospital X in 2022. Data on waiting time to go home were taken based on SIMRS records to analyze the relationship between characteristics and stages of the process carried out on achieving waiting time and the factors that have the most dominant influence on this achievement. Through logistic regression test. Based on the characteristics and stages of the process, the achievement of the waiting time for discharge was influenced by the most dominant factor, namely insurance (OR 21.60, p = 0.00), DPJP visit on the D-day (OR 1.32, p = 0.02), history of surgery (OR 0.66, p = 0.00), and history of critical care during hospitalization (OR 0.41, p = 0.00). Meanwhile, the day of discharge, length of stay, planning for D-1 discharge, and return of D-1 medicines and medical devices did not significantly affect the achievement of waiting time for discharge. The type of guarantee factor, D-day DPJP visit, history of surgery, and history of critical care during the hospitalization period have proven to influence the achievement of the expected discharge waiting time. Thus a directional improvement plan through the fourth root cause approach is expected to significantly improve patient satisfaction and trust. Furthermore, in-depth studies of other factors need to be carried out for continuous improvement. [ABSTRACT FROM AUTHOR]

Pembangkit Listrik Tenaga Minihidro (PLTM) Cisanggiri adalah pembangkit listrik yang terletak di Kecamatan Cihurip Kabupaten Garut Jawa Barat. Pembangkit Listrik Tenaga Minihidro ini merupakan energi potensial yang berasal dari air kemudian diubah menjadi energi listrik dengan daya 100 Kv sampai dengan 10 MegaWatt. Sungai Cisanggiri ini dalam pemanfaatannya memiliki beda tinggi head elevasi kontur tanah ± 114 m sehingga layak digunakan untuk membangun pembangkit listrik. Hal ini terbukti dengan dibangunnya PLTM Cisanggiri yang memiliki kapasitas daya listrik 1.5x2 MegaWatt, namun kapasitas keluaran daya listrik ini belum maksimal, sehingga PLTM Cisanggiri ini perlu di evaluasi kembali untuk mengetahui keluaran daya listrik maksimalnya. Evaluasi perhitungan ini dilakukan berdasarkan layout design existing yang telah dibangun sebelumnya serta data klimatologi yang terdapat di area sekitar DAS Cisanggiri. Kemudian dievaluasi untuk mengetahui apakah permasalahan yang membuat PLTM Cisanggiri ini tidak maksimal. Debit yang dihitung merupakan debit andalan atau debit ketersediaan yang dihitung berdasarkan metode FJ Mock dengan probabilitas Q85% menggunakan data hujan 10 tahun. Kemudian perhitungan selanjutnya mencari kehilangan energi (headlosses) pada sistem bangunan PLTM Cisanggiri dan daya listrik yang dihasilkan. Hasil dari perhitungan didapat debit ketersediaan pada sungai Cisanggiri sebesar 7.82 m³/s, dengan kehilangan energi (headlosses) yang telah dihitung berdasarkan kehilangan energi pada gesekan penampang saluran, headrace, pembesaran dan pengecilan penampang, trashrack dan penstock sebesar 1.45452 m. Kemudian setelah itu dievaluasi perhitungan daya keluaran listrik maksimal yang dapat dihasilkan PLTM Cisanggiri ini yakni sebesar 5.7 MegaWatt.

Jalan Pramuka is a axis road that connects Jalan A. Yani with Jalan Veteran which is located in the East Banjarmasin District, Banjarmasin City. The role of the road is very important in supporting the economy of the city of Banjarmasin, but there are various problems with the utility of the drainage channel when it rains which interferes with the smooth flow of traffic on the road such as sedimentation, blockage, ponded and closed of yard of building. Another factor that affects the presence of ponding is the condition of the elevation of the upper section of the drainage channel which is higher than the elevation of the road so that ponded water on the road cannot flow into the drainage channel. The results showed the runoff discharge in the 5-year return period was 0.794 m³/second and in the 10-year return period 1.180 m³/second, the drainage channel discharge values obtained the discharge value of the channel on the right of the road at STA 0+000 – STA 1+100 of 2.631 m³/second, at STA 1+100 – STA 1+230 it is 0.731 m³/second, at STA 1+300 – STA 2+000 it is 2.402 m³/second. This condition shows that the channel at STA 1+100 – STA 1+230 which is on the right side of the road does not meet the requirements for the design discharge. Designing a drainage channel at STA 1+230 by lowering the channel bottom elevation by 65 cm so that ponding on the road can flow into the drainage channel. [ABSTRACT FROM AUTHOR]

The soil water discharge of line source emitters under Moistube irrigation, commonly called nano irrigation, was investigated. Moistube is a pipe made of flexible semi-permeable membranes that has recently been used in Morocco to further minimize water consumption relative to drip irrigation. Being a relatively new technology, it is still in the experimental stage, therefore, there is little data on the critical parameters that would improve the water use efficiency. Before starting the field trials to test the system on crops, a series of soil box experiments were carried out to examine the water dynamics and discharge of laterals under two soil types at different pressure heads and at different dry bulk densities. The results showed that the discharge decreased when the laterals were buried compared to non-buried laterals, and decreased further with the compaction of the soil. The laterals discharge showed a decreasing trend as the soil texture becomes finer and the discharge decreases even more with soil compaction of the tested textures. We also found that the measured discharge at 2 m pressure head for the non-buried laterals was far greater than the value declared by the manufacturer. The exponent values of the fitted power function equations were much greater than 1, showing a laminar flow regime of the laterals and high sensitivity to pressure changes. The coefficient of variation was within the acceptable range (< 20%) and decreases with increasing operating pressure. Overall, our results suggest that 1) soil texture and compaction affect the laterals discharge and should be considered in the design of nano irrigation system in terms of laterals depth and spacing, , 2) make sure to adopt a suitable design or shorten the laterals in response to their high sensitivity to pressure changes, 3) as the technology is new and is still in its experimental stage, tests that mimic field conditions are still important before installation to achieve a homogeneous laterals discharge. Our findings would provide a preliminary basis to help professionals to design the system in Morocco.

Ketersediaan data sumber daya air di Indonesia memiliki beberapa permasalahan yang kompleks terkait dengan kesempurnaan data. Permasalahan yang terjadi saat pendataan di beberapa instansi di Indonesia adalah kurangnya keakuratan dan kelengkapan data. Terdapat beberapa metode yang dapat digunakan untuk imputasi nilai hilang, misalnya k-Nearest Neighbors Imputation (k-NNi) dan Multivariate Imputation by Chained Equation (MICE). Tujuan makalah ini adalah membandingkan dan menemukan metode yang paling tepat dalam menggunakan dataset DAS Opak di Provinsi DIY. Karakteristik DAS Opak adalah berbentuk kipas atau melebar sehingga memberikan waktu konsentrasi yang lebih rendah dan menghasilkan aliran yang lebih tinggi. Hasil perbandingan validasi statistik, nilai rata-rata RMSE dan MAE, yang paling konsisten adalah metode k-NNi dengan nilai k = 28, sedangkan untuk perbandingan nilai R-Squared, metode k-NNi dengan nilai k = 28 mendapatkan nilai rata-rata terbaik sebesar 80%, disusul metode k-NNi sebesar k = 7 sebagai nilai k default dengan persentase 73%. Metode perbandingan MICE mendapatkan nilai persentase rata-rata terendah dari metode lainnya, yaitu sebesar 63%.

To keep a company's financial data organized, accountant developed a system that sorts transactions into records called account. An account is an individual record of increase and decrease in a specific asset, liability, or owner's equity/stockholders' equity item. In its simplest form, an account consists of three parts (a) the title of the account, (b) a left side or debiting, and (c) a right side or crediting. The combine of those parts become a form that we called a Taccount. T-account need two element that consist of debit and credit that used by accountants when recording transactions in business company. Some transactions are a mixture of increase/decrease effect. The types of accounts that increased with a debit like dividends, expenses, assets, and losses. Then for increased with a credit like gains, income, revenues, liabilities, and stockholders (owner's) equity. So an asset account is increased with a debit and therefore it is decreased with a credit. The other one is the debit/credit system has internal consistency that attempts to describe the effects of a transaction in debit/credit for and it will be something wrong when debits do not equal credits. For now, financial report was computerized systems that challenge any attempt to unbalanced transaction that does not satisfy the condition of debits = credits. The debit/credit rules are built with logical structure. [ABSTRACT FROM AUTHOR]

Copyright of College of Law Journal for Legal & Political Sciences / Magallat Kulliyyat Al-Qanun Li-L-ulum Al-Qanuniyyat Wa-Al-Siyasiyyat is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Irrigation & Drainage is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Pengukuran debit di saluran irigasi dapat dilakukan dengan alat ukur debit berupa bangunan ukur, current meter dan pelampung. Pengukuran debit mengunakan bangunan ukur ini bertujuan untuk efisiensi pengelolaan air irigasi di tingkat petani. Jenis bangunan ukur yang sering digunakan adalah bangunan ukur ambang lebar dan ambang tajam. Betuk bangunan ukur ambang tajam terdiri dari segitiga, trapesium dan segi empat. Berdasarkan uraian tersebut, prototipe saluran irigasi skala laboratorium dilengkapi dengan bangunan ukur ambang tajam segi empat di bagian ujung saluran untuk simulasi dan percobaan pengukuran debit. Tujuan dari penelitian ini adalah rancang bangun prototipe saluran irigasi, uji fungsional dan uji kinerja protipe saluran irigasi. Hasil penelitian menunjukkan bahwa prototipe saluran irigasi berfungsi dengan baik dan dapat digunakan untuk percobaan pengukuran debit. Uji kinerja prototipe saluran irigasi menunjukkan bahwa bak volumetrik sangat akurat untuk pengukuran debit aktual dengan R2 = 0,999. Sementara itu rata-rata koefisien kalibrasi pengukuran debit menggunakan persamaan Kinsvater-carter adalah 0,868 dan persamaan umum adalah 0,983.

Copyright of Naturaliste Canadien is the property of La Societe Provancher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Abstract: Mathematics is a universal science that underlies the development of modern technology, has an important role in various disciplines and advances the power of human thought. In Class V SDN Rembang 2, Sananwetan District, Blitar City, learning Mathematics still requires appropriate methods so that students can solve mathematical problems in their own way with the correct answers. The results obtained by class V in learning Mathematics for Debit material still obtained a very low completeness score. Of the 27 students who can solve Debit questions, only 10 students or 37%, while the limit for the completeness value is 75. As a result of such learning, the teacher conducts research using the Open Ended method, namely learning that allows students to develop a mindset according to their interests and abilities. the ability of each in various solutions and various answers. Abstrak: Matematika merupakan ilmu universal yang mendasari perkembangan teknologi modern, mempunyai peran penting dalam berbagai disiplin dan memajukan daya pikir manusia. Di Kelas V SDN Rembang 2 Kecamatan Sananwetan Kota Blitar, pembelajaran Matematika masih memerlukan metode yang sesuai agar siswa dapat memecahkan permasalahan matematika berdasarkan caranya sendiri dengan jawaban yang benar. Hasil yang diperoleh kelas V dalam pembelajaran Matematika materi Debit masih memperoleh nilai ketuntasan yang sangat rendah. Dari 27 siswa yang dapat menyelesaikan soal Debit hanya 10 siswa atau sebesar 37%, sedangkan batas nilai ketuntasannya adalah nilai 75. Hasil belajar demikian maka guru melakukan penelitian dengan menggunakan metode Open Ended, yaitu pembelajaran yang memungkinkan siswa untuk mengembangkan pola pikir sesuai dengan minat dan kemampuan masing-masing dalam berbagai penyelesaian dan jawaban yang beragam.

Liku kalibrasi debit merupakan kurva yang menunjukkan hubungan antara tinggi muka air dan debit sungai sehingga dapat digunakan untuk memprediksi besarnya debit pada sungai tersebut. Tujuan penelitian ini adalah untuk mendapatkan persamaan liku kalibrasi debit di DAS Deli. Penelitian ini dilakukan dengan mengukur debit air sungai dan mengambil data tinggi muka air menggunakan alat water level logger dengan pengamatan minimal dua kali dalam seminggu. Debit air sungai pada lokasi penelitian memiliki nilai yang bervariasi yaitu 0,74 - 3,28 m3/detik dengan rata-rata 1,06 m3/detik. Penentuan persamaan liku kalibrasi debit menggunakan beberapa metode yaitu linier, polinomial, berpangkat, logaritmik, dan eksponensial. Hasil dari penelitian diperoleh bahwa persamaan dengan metode polinomial orde dua memiliki tingkat korelasi (r) dan RMSE yang terbaik dengan nilai r 0,986 dan nilai RMSE 0,011. Persamaan rating curve yang diperoleh adalah Q = 18,97(h)2 – 1,372(h) + 0,190.

Modifikasi pompa air bertenaga mesin telah dilakukan dengan memanfaatkan aliran air lemah. Tenaga penggerak pompa ini adalah kincir dengan rpm (putaran per menit) rendah. Pompa ini terdiri atas delapan bagian utama, yaitu: rangka, kincir, gear besar, gear kecil, pompa jet, pipa masukkan, dan pipa keluaran. Pompa ini bekerja dengan mengkoversi aliran air debit rendah untuk memutar kincir yang tergandeng dengan gear besar. Selanjutnya, gear besar pada kincir juga berputar diikuti gear kecil pada pompa jet yang dihubungkan dengan rantai. Putaran gear kecil menggerakkan komponen pompa jet yang berputar untuk mengisap dan membuang air. Performa pompa ini dianalisis dengan mengukur debit pada ketinggian tertentu. Berdasarkan analisis yang telah dilakukan, maka diketahui bahwa pompa ini mampu mengangkat air sampai ketinggian 6 meter dengan debit air 0,02 liter per detik.

Prestasi belajar siswa kelas VI SDN Curahsawo dalam materi Debit rendah karena siswa dituntut mempelajari materi yang tidak sesuai dengan karakter siswa dan hanya menggunakan satu bahan ajar yang menekankan pada aspek kognitif. Pengembangan modul berbasis kecakapan hidup ini disesuaikan dengan karakter siswa dan memperhatikan keseimbangan antara aspek kognitif, afektif, dan psikomotorik serta membekali siswa dengan pendidikan kecakapan hidup. Tujuan penelitian ini adalah menghasilkan modul berbasis kecakapan hidup yang valid, praktis, menarik, efektif, serta dapat meningkatkan prestasi siswa kelas VI dari 52% menjadi minimal 70%. Penelitian ini mengadaptasi model pengembangan Borg & Gall. Tahap pengembangan ini adalah studi pendahuluan, perencanaan, desain produk, validasi modul, uji coba lingkup kecil, uji coba lingkup besar, revisi modul, dan produk akhir. Hasil validasi ahli materi mencapai 87,5% dan hasil validasi ahli media mencapai 96,8%. Hasil rata-rata angket kepraktisan berpersentase 88,35% dan hasil angket kemenarikan siswa berpersentase 94,1% dalam uji coba lingkup kecil. Sementara untuk uji coba lingkup besar, tingkat kepraktisan modul mencapai 89,5%, tingkat kemenarikan modul mencapai 92,5%, dan hasil evaluasi belajar siswa menunjukkan 83,3% tuntas belajar atau 31,3% lebih tinggi dibandingkan pretest yaitu 52%. Berdasarkan hasil tersebut, modul berbasis kecakapan hidup telah valid, praktis, menarik, dan efektif digunakan dalam pembelajaran Matematika kelas VI.

Copyright of Larhyss Journal is the property of Biskra University, Research Laboratory in Subterranean & Surface Hydraulics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Knowledge & Management of Aquatic Ecosystems is the property of EDP Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Larhyss Journal is the property of Biskra University, Research Laboratory in Subterranean & Surface Hydraulics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Larhyss Journal is the property of Biskra University, Research Laboratory in Subterranean & Surface Hydraulics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of EMERG: Energy. Environment. Efficiency. Resources. Globalization is the property of Romanian National Committee of World Energy Council and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Larhyss Journal is the property of Biskra University, Research Laboratory in Subterranean & Surface Hydraulics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The aim of this paper is to provide a statistic overview of the hydrological impact of the Siriu Dam on the Buzau River (Romania), taking into account the temporal variations. Our case study uses the daily mean discharges of the Buzau River (1st of January 1955 to 31st of December 2010), registered at Nehoiu hydrometric station. The building of the Siriu Dam in 1984 required the division of the study interval into two sub-periods, each being analyzed annually and seasonally, on the series themselves or on the pre-whitened ones when prior required. The existence of a linear trend on different periods and sub-periods has been studied by using the Mann-Kendall and Seasonal MannKendall tests. In the case of the existence of a linear trend, the slopes have been calculated with Sen’s Slope Estimator. The stationarity has been studied by using the Dickey-Fuller and Kwiatkowski–Phillips–Schmidt–Shin tests. According to our preliminary results, the stationarity in trend after the dam’s construction, respectively increasing linear trends for almost all the data series and subseries was observed. The trend and stationarity outcomes proved that the Siriu Reservoir has a good impact on the homogeneity of the Buzau River’s discharge and the increasing trends are related to human activity impact coupled with climate change/variability. [ABSTRACT FROM AUTHOR]

This paper comes out with an experimental investigation of the expansion of refrigerant HFC-134a through adiabatic capillary tubes with internal diameters ranging from 0.23 mm to 0.53 mm aiming at the so-called mesocooling applications. To this end, an experimental apparatus was designed and constructed to emulate the operating conditions of mesoscale refrigerating devices, with condensing pressures ranging from 9 to 19 bar, and inlet refrigerant subcooling ranging from 5 to 10 K. The tube length was varied from 1 to 2 m. The tests were carried out following a factorial design. The experimental data were used to assess the mass flow rate prediction capabilities of an explicit, algebraic model for adiabatic capillary tubes devised in a prior work. The results revealed that the model is not suitable for small-bore capillary tubes. Correction factors were proposed, so that the model predictions for more than 90% of the experimental dataset fell within ±10% error bounds. [ABSTRACT FROM AUTHOR]

Perubahan penggunaan lahan dari lahan bervegetasi ke non vegetasi mengakibatkan besarnya limpasan (run off) sehingga debit menjadi meningkat terutama pada musim hujan. Penelitian ini dilakukan untuk menganalisis debit pada DAS Air Dingin menggunakan model SWAT dan apakah model SWAT dapat diterapkan dalam mempresentasikan debit pada DAS Air Dingin. Model SWAT memerlukan data iklim, peta dan data tanah, curah hujan, kelerengan dan peta penggunaan lahan. Adapun tahapan yang dilakukan yaitu penyiapan data dan peta, deliniasi DAS, pembentukan HRU, simulasi visualisasi, kalibrasi, dan simulasi dengan model SWAT terkalibrasi. Debit DAS Air Dingin berkisar antara 3 – 30 m3/s. Setelah dilakukan kalibrasi model SWAT dapat mempresentasikan keadaan hidrologi DAS Air Dingin dengan R2 0,76 dan NS 0,64 sehingga model SWAT yang dijalankan dapat dikategorikan memuaskan.

Abstrak. Kebutuhan air semakin meningkat, maka air dari sisi ketersediaan perlu dikelola serta diatur sesuai dengan kebutuhan, sehingga air dapat dimanfaatkan dan didistribusikan jika diperlukan. Salah satu permasalahan yang mendasar di Indonesia pada sektor pertanian adalah ketersediaan air. Air terbatas dalam jumlah dan waktu juga ruang serta letak sumber air yang lebih rendah dari lahan pertanian. Terkait tingginya kebutuhan air tersebut, pemanfaatan teknologi yang mampu mengangkat dan mengalirkan air dari sumbernya ke lahan-lahan pertanian serta hunian penduduk sangat dibutuhkan, salah satu teknologinya adalah pompa. Penelitian ini bertujuan untuk melakukan rancang bangun pompa sistem wheel spiral sebagai inovasi untuk irigasi.Pengujian dilakukan 3 kali ulangan dengan lama waktu 1 jam dengan RPM 6,917 ± 7,83, kecepatan sudut 0,72 ± 0,77, daya poros 0,25 ± 0,27 Watt, debit air tertampung 0,0001533 ±0,0001732 m3/s, energi kinetik 0,36 ± 0,42 Watt, dan rata-rata efisiensi pompa 67,85 %. Tinggi maksimum pengeluaran yang dapat dicapai oleh pompa adalah 1,52 m. Pompa ini bisa menaikkan air lebih tinggi dari sudu-sudu tertinggi pada kincir serta efisiensi yang dihasilkan cukup besar sehingga dapat digunakan untuk mengairi lahan yang berada diatas sumber air. Design Of Pump With Spiral Wheel System For Small Scale Abstract. The needs of water is always increase, the available water have to manage and control by human as a needed. Water can be used and distributed if it needs. One of the basic water’s problem in agriculture sector is the field capacity of water. Water is limited in quantity, naut and the water position is lower than the land. Thinking about the high need of water, it is important to use technology to rise and distribute the water from the reservoir to lands and also to living live. One of the technology is pump. This research was conducted to design a pump without machine as a new invention for irrigation. This research is about one hour with 3 times repeatation RPM 6,917 ± 7,83, angle velocity 0,72 ± 0,77, axis power 0,25 ± 0,27 Watt, accomodated rate of flow 0,0001533 ± 0,0001732 m3/s, kinetic energy 0,36 ± 0,42 Watt, and rate of pump efficiency 67,85%. The maximum high of output can reached by the pump is 1.52 m. This pump can rise water higher than the highest goosebeak on waterwheel and the efficiency is highest than the waterwheel. So, it can be used to irrigate the lands that position is above the water.

Air merupakan sumber daya alam yang memiliki peran yang penting dalam kehidupan. Air yang melimpah dapat digunakan dengan baik bila tidak ada masalah pada saat pengaliran. Sebaliknya apabila pada saat pengaliran terdapat masalah maka air dapat menjadi bencana bagi lingkungan sekitarnya. Pada tahun 2017 saluran drainase Jalan Riau Ujung mengalami permasalahan drainase yakni terjadinya genangan. Genangan yang terjadi menjadi sebuah permasalahan tersendiri yang perlu dianalisis. Berdasarkan dari permasalahan tersebut, dilakukan penelitian untuk meninjau ulang saluran drainase dengan melakukan survei dilokasi terjadinya banjir untuk memperoleh data-data seperti data kontur, data pengukuran saluran drainase, data curah hujan, data jumlah penduduk dan data-data penunjang lainnya. Dari data-data yang terkumpul maka dilakukan analisis data yang bertujuan untuk mengetahui dimensi eksisting saluran drainase yang sudah ada apakah mampu menampung debit air hujan dan limbah buangan rumah tangga. Penelitian dilakukan di Jalan Riau Ujung, dimana kondisi eksisting drainase berbentuk trapesium dan persegi panjang dengan dimensi lebar yang beragam, 17 tipe dan ukuran saluran disebelah kiri jalan dan 10 tipe dan ukuran saluran disebelah kanan. Perhitungan frekuensi curah hujan dengan menggunakan metode Distribusi Gumbel, perhitungan intensitas curah hujan menggunakan metode SNI 03-3424 1994 dan kecepatan aliran menggunakan metode Manning. Dari hasil analisis diperoleh debit eksisting lebih besar dari debit hujan dan limbah buangan jadi dimensi dan kapasitas drainase masih dapat menampung debit yang ditimbulkan dari hujan dan limbah buangan, hal ini dibuktikan dengan hasil analisis yang dilakukan. Sehingga diperoleh kesimpulan penyebab genangan air pada jalan yang di tinjau bukan disebabkan oleh besarnya limbah buangan dan debit hujan.

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