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4. Heat transfer properties of hybrid foam panel composite.

Author

Jofrishal, Jofrishal, Adlim, M., Yusibani, Elin, and Akhyar, Akhyar

Subjects
HEAT transfer, HEAT radiation & absorption, CONSTRUCTION materials, PORTLAND cement, POLYMER-impregnated concrete, FOAM
Abstract

Urban heat is one of the current climate problems due to conventional concrete materials and the high density of building blocks surrounded by. This study developed new building materials for concrete walls that reject the sun's heat and reduce heat absorption on the walls. The new building panel was made of a hybrid foam (HF) composite concrete with a polymer matrix. The composition of polyurethane foam and cement with various fillers from ordinary Portland cement (OPC), white Portland cement (WPC), and rice husk ash (RHA) were explored and analyze the effect of using each filler on heat absorption and release. Measurements were carried out on a laboratory scale, using a 250 Watt IR lamp as a heat source, a thermal sensor and the microcontroller Arduino unit to record the temperature change during measurement of the surface and bottom of the panel. The use of WPC cement as a material for panels is better than OPC cement in reducing heat. On the other hand, the use of a polyurethane polymer matrix for hybrid foam and the addition of RHA to the filler has been proven to improve the performance of the panel in reducing the IR radiation absorptivity of the panel and releasing heat faster than without polymer and RHA. [ABSTRACT FROM AUTHOR]

Published
2023
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7. Analisis Korelasi Indeks Penguapan Dengan Sebaran Curah Hujan di Provinsi Aceh

Author

Meinelva, Putri, Syahreza, Saumi, and Yusibani, Elin

Abstract

Laut menjadi sangat penting karena berperan dalam proses terbentuknya awan dan hujan. Perubahan suhu muka laut dapat mempengaruhi kondisi atmosfer begitu pula sebaliknya. Tujuan dari penelitian ini adalah mengungkapkan hubungan antara indeks penguapan perairan di sekitar Provinsi Aceh dengan sebaran curah hujan di wilayah Provinsi Aceh. Analisis ini dihitung berdasarkan indikator suhu muka laut, suhu udara permukaan dan angin zonal permukaan. Analisis hubungan curah hujan dengan indeks penguapan menggunakan metode korelasi yang selanjutnya dispasialkan. Hasil penelitian menunjukkan bahwa Provinsi Aceh memiliki pola hujan yang beragam, curah hujan yang tinggi terjadi di wilayah tengah sampai ke wilayah barat selatan Provinsi Aceh dimana wilayah ini memiliki topografi tinggi, dan curah hujan semakin rendah ke arah timur dan utara Provinsi Aceh. Hubungan indeks penguapan di perairan sekitar Provinsi Aceh dengan sebaran curah hujan menunjukkan nilai korelasi yang sangat bervariasi, secara umum korelasi paling kuat terjadi di bulan Agustus dengan nilai korelasi 0,952 antara curah hujan di pos hujan Lamno dengan indeks penguapan di grid 17.The ocean is incredibly necessary as a role in the process of forming clouds and rain. Changes in sea surface temperature will affect part conditions and vice versa. This study purposed to reveal the connection between the evaporation index of the waters around Aceh Province and, therefore, the rainfall distribution in the Aceh Province. This analysis calculates supported sea surface temperature, surface air temperature, and surface zonal winds. Analysis of the relationship between rainfall and evaporation index mistreatment is the correlation technique that is then spatialized. The result shows that Aceh Province has a type of high rainfall pattern, that happens within the central region to the southwest region wherever this region is a high topography, while lower rainfall is obtained towards the east and north of Aceh Province. The correlation between the evaporation index in the waters around Aceh Province and therefore the distribution of rainfall shows an extremely variable correlation, generally, the strongest correlation occurs in August with a correlation value of 0.952 between rainfall in the Lamno rain post and the evaporation index on grid 17.

Published
2022
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17. Physical Model of Discontinuity Response in Landslide Application Using Geometry Normalized Electromagnetic System (GNES).

Author

Surbakti, Muhammad Syukri, Bukhari, Ismail, Nazli, Idris, Nasrullah, Isa, Muhammad, Yusibani, Elin, Zakaria, Nurman, Muhammad, and Jafri, MohdZubir Mat

Subjects
ALUMINUM plates, LANDSLIDES, ELECTROMAGNETIC fields, METAL defects, GEOMETRY, EDDIES
Abstract

The discontinuity in a fractured land in landslide application could be represented by the metal defects in the physical modeling that will usually reduce the mass of the metal. The scale factor n is important for interpreting the field data using the physical model data. In this physical modeling (n=100), the anomaly targets are aluminum plates and aluminum plates with the discontinuities. It is assumed the nonconductive environment. In the free-air condition which has zero conductivity is become representative of this environment. In the zero conductivity, the secondary field from the medium is not presence. In this condition, there are no phase differences between transmitted electromagnetic fields and that was received by the receiver. The discontinuity in this term is any treatment or defect that causes disruption or leads to a reduction in response triggered by the eddy currents. The discontinuities used on the thin plates and flaws will interrupt or reduce the eddy current flow on the plate, thereby reducing the induced voltage on the receiving coil and increasing its effective impedance. This is the basis of eddy current measurement. The electromagnetic field response to a metal that has discontinuities will change the eddy current portion. The eddy current that changes, therefore, will change the second field so that the percent response (% Response) of the receiver in the Geometry Normalized Electromagnetic System (GNES) instrument will also change. [ABSTRACT FROM AUTHOR]

Published
2020
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33. Pb Bi-cooled direct contact boiling water small reactor

Author

Takahashi, Minoru, primary, Uchida, Shoji, additional, Hata, Koji, additional, Matsuzawa, Takaharu, additional, Osada, Hiroo, additional, Kasahara, Yoshiyuki, additional, Sawa, Naoki, additional, Okubo, Yoshiyuki, additional, Obara, Toru, additional, and Yusibani, Elin, additional

Published
2005
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