A CFD simulation study on pressure drop and velocity across single flow microchannel heat sink

This paper presents a numerical simulation of flow in a microchannel heat sink. The channel was defined as a dimension with less than 1.0milimeter and greater than 100.0micrometer. The ANSYS CFX 2015 was used to predict the flow in the microchannel. Besides, simulations were undertaken to determine the flow of the fluid within the microchannel in three different models. Therefore, three different models were employed for this study. The first model was a square-shaped channel with 0.5mm width and 0.5mm height constructed along 28.0mm channel length. The second and the third models were in rectangular shape. The differences between these models were their width and height of channel. The dimension for the second model was 0.75mm height and 0.5mm width (rectangular A), while the dimension for the third model was 0.5mm height and 0.75mm width (rectangular B). All the microchannel heat sink models had been simulated and showed results for pressure, temperature, and velocity inside the microchannel. The results were compared for each model and the data had been validated from published data. In addition, the initial velocity was set in a range between 0.1m/s and 0.5m/s. The highest pressure drop was recorded for the square microchannel. It was 58.12% higher than the pressure drop found in the rectangular microchannel with 0.75mm width, while 0.02% closer with the 0.75mm-height rectangular microchannel. Furthermore, there was a 33.34% of temperature difference, which had been higher for the square microchannel. Nevertheless, the highest velocity of 0.57m/s was recorded at the outlet of the microchannel. These had been consistent with other published data

Potential dopant in photocatalysis process for wastewater treatment-a review

Nowadays, too much pollution has happened around us, and one of them is water pollution, which each day has become more severe and worse. One of the sources of water pollution comes from the industry that has used dyes either excessively or not. In case of that, the wastewater needs to be treated before released to the river or environment. In this paper, a review of the wastewater treatment using dopants such as nitrogen and magnesium, will be discussed

Tingkat Kecemasan Atlet Bola Pon Aceh Tahun 2016

Penelitian yang berjudul: “Tingkat Kecemasan Atlet Bola Voli PON Aceh Tahun 2016”. Penelitian ini bertujuan untuk mengetahui tingkat kecemasan pada atlet bola voli PON Aceh tahun 2016. Jenis pendekatan yang digunakan dalam penelitian ini adalah pendekatan kuantitatif dengan jenis deskriptif yaitu data yang diperoleh berbentuk angka-angka, di mana penulis mengungkapkan fakta-fakta dan data berupa persentase pada saat penelitian dilakukan. Populasi dalam penelitian ini adalah atlet bola voli PON Aceh tahun 2016 yang berjumlah 11 orang atlet. Mengingat jumlah populasi yang relatif sedikit maka semua anggota populasi dijadikan sampel penelitian (total sampling). Teknik pengumpulan data dalam penelitian ini menggunakan angket. Teknik analisis data menggunakan kategorisasi jenjang dengan tujuan untuk mendapatkan tingkat kecemasan dan selanjutnya menghitung persentase. Berdasarkan hasil analisis data dapat disimpulkan bahwa tingkat kecemasan atlet bola voli PON Aceh tahun 2016 dengan rata-rata 84,8% berada pada kategori sedang dengan rincian sebagai berikut: (1) sebanyak 2 responden (18,1%) berada pada kategori rendah dan (2) sebanyak 9 responden (81,9%) berada pada kategori sedang. Dengan demikian, tingkat kecemasan atlet bola voli PON Aceh tahun 2016 rata-rata menyatakan mengalami kecemasan sebelum bertanding yaitu sedang. Disarankan kepada pengurus atau pelatih agar dapat memberikan pengetahuan tentang psikologi pada semua atlet

Hubungankemampuan Motorik dengan Keterampian Bermain Bola Voli pada Mahasiswa Program Studi Penjaskesrek Fkip Unsyiah Angkatan 2013

Penelitian ini berjudul “Hubungan Kemampuan Motorik dengan Keterampilan Bermain Bola Voli pada Mahasiswa Program Studi Penjaskesrek FKIP Unsyiah Angkatan 2013”. Penelitian ini mengangkat masalah apakah terdapat hubungan antara kemampuan motorik dengan keterampilan bermain bola voli. Penelitian ini bertujuan untuk mengetahui hubungan kemampuan motorik dengan keterampilan bermain bola voli.Penelitian ini menggunakan metode penelitian deskriptif korelasional. Populasi dalam penelitian ini berjumlah 75 orang, sedangkan pengambilan sampel yang dilakukan dengan cara Purposive Samplingyaitu mahasiswa yang telah lulus mata kuliah T.P bola Voli dengan nilai A sebanyak 20 orang dan di buktikan melalui KHS. Teknik pegumpulan data untuk kemampuan motorik dengan menggunakan tes (1) melempar pada sasaran/target, (2) kelentukan Togok dan pinggang, (3) lompat jauh tanpa awalan, (4) lengkup dan bangun, (5) push-up dan (6) kelincahan larisedangkan untuk keterampilan bermain bola voli dengan tes(1) service, (2) passing dan(3) smash. Pengolahan data dilakukan dengan korelasi product moment.Hasil penelitian yang diperoleh adalah sebagai berikut: terdapat hubungan antara kemampuan motorik denganketerampilan bermain bola volisebesar (r = 0.42). Hasil pengujian hipotesis menunjukkan bahwa thitung = 1.99 ≥ ttabel = 1.73. Maka terdapat hubungan yang signifikan antara kemampuan motorikterhadap keterampilan bermain bola volipada mahasiswa Program Studi Penjaskesrek FKIP Unsyiah angkatan 2013 dapat diterima kebenarannya

Kajian Total Biomassa Rerumputan Dan Pengaruhnya Terhadap Tata Air Tanah Di Daerah Tangkapan Air Danau Toba. Studi Kasus Di Kecamatan Silahisabungan Kabupaten Dairi

The study on the total of biomass of grasses and it\u27s influences on soil moisture was conducted atSilahisabungan Subdistrict Dairi District, from November 2011 until February 2012. The objectiveof this research was to evaluate the effect of grasses to soil mositure. This study used survey methodwith purposive sampling. The result of this research showed that grass vegetation with rathersloping class total biomass 10,6 ton/ha, carbon reserve 5,3 ton/ha, field capacity 63,4 %, permanentwilting point 1,3 %, water content 62,0 % and permeability 7,5 cm/hours. In the undulating slopestotal biomass 7,1 ton/ha, carbon reserve 3,55 ton/ha, field capacity 51,6 %, permanent wiltingpoint 2,4 %, water content 49,2 % and permeability 7,6 cm/hours. In the rather steep slope totalbiomass 15,5 ton/ha, carbon reserve 7,75 ton/ha, field capacity 32,8 %, permanent wilting point 3,8%, water content 29,0 % and permeability 9,6 cm/hourd. In the forest vegetation with rather slopingclass, biomass total 7,54 ton/ha, carbon reserve 3,77 ton/ha, field capacity 150 %, permanent wiltingpoint 23,5 %, water content 126,5 % and permeability 10,3 cm/hours. In the undulating slopes totalbiomass 6,24 ton/ha, carbon reserve 3,12 ton/ha, field capacity 51,5 %, permanent wilting point 7,5%, water content 44 % and permeability 8,2 cm/hours. In the rather steep slope total biomass 8,86ton/ha, carbon reserve 4,43 ton/ha, field capacity 33,3 %, permanent wilting point 4,2 %, watercontent 29,2 % and permeability 11,25 cm/hours

Peranan Mikoriza Terhadap Pertumbuhan, Serapan P Dan Cd Tanaman Sawi (Brassica Juncea L.) Serta Kadar P Dan Cd Andisol Yang Diberi Pupuk Fosfat Alam

This study aimed to determine the role of Mycorrhizae on plant Cd uptake P and mustard(Brasicca juncea L.) as well as the availability of P and Cd in fed Andisol phosphate fertilizer. Theresearch was conducted in the Greenhouse, Soil Biology Laboratory, and the Laboratory ofResearch and Technology Faculty of Agriculture, University of North Sumatra, Medan, in July2012-March 2013. This study uses a randomized block design (RBD) Factorial. The first treatmentwas a factor with two levels of mycorrhizal inoculum M0 (0g) and M1 (20g), the second factor isthe treatment of phosphate fertilizer (SP-36) with 4 dose levels, P0 (0g), P1 (0.97g), P2 (1.94g ),and P3 (3.88g) with 3 Deuteronomy thus obtained 2x4x3 = 24 experimental units. The parametersmeasured were the canopy dry weight, root dry weight, P uptake, mustard plant (Brasicca juncea L.)Cd uptake, the degree of mycorrhizal infection, levels availbility of P and Cd levels Andisol. Theresults showed that administration of Mycorrhizae increase the dry weight of the canopy, the degreeof infection of the roots, P uptake and plant-available soil P levels. Phosphate fertilizersincreased the dry weight of the plant canopy and P uptake, and tend to increase levels of P and Cdsoil and plant P uptake but not statistically

Karakteristik Lahan Sawah Yang Dialih Fungsi Menjadi Lahan Perkebunan Di Desa Tangga Batu Kecamatan HatonduhanKabupaten Simalungun

At Latest ten years, the paddy land at Tangga Batu area is use changed into plantation. This research was conducted to study characteristics of soil at some land uses ( paddy, rubber- cacao, and palm of 1,5 and 10 years old ).Soil sampling is conducted by using survey method. Soil samples are taken as soil sample disturbed and non distrubed at three (3) points in eachs land use randomly. The result showed that there is decreasing of total nitrogen at plantation and increasing of P- available at mixed farm (rubber – cacao). There are no changes of soil characteristics such us like potassiumexchange, pH, soil permeability, soil texture, and soil respirationat some land uses ( paddy, rubber- cacao, and palm of 1,5 and 10 years old )

Financial capability and financial literacy among university student

The statistics information by Department of Statistics Malaysia and the Ninth Malaysia Plan’s indicate that most youth group had declared bankrupctcy. As information given, it is showed that young Malaysians are not prepared to deal with the consequences of having financial crisis.The objectives of this study are to identify the level of student university financial literacy and financial capability and to analyze the relationship between the theory of planned behavior (TPB) factor and financial literacy toward financial capability among university student. Using description analysis and multiple linear regressions, it is found that there is lower level or incapable on the level of financial capability among the university students. Furthermore, the attitude, subjective norm and perceived behavior which are TBP factor had shown the relationship toward the level of financial capability