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"Ilmu Pengobatan dan biomedis dalam perkembangan penelitianya memerlukan cold storage yang mampu mencapai temperatur -80°C. Untuk mencapai temperatur rendah tersebut digunakan sistem refrigerasi autocascade. Selama ini sistem refrigerasi autocascade menggunakan refrigeran yang mengandung zat perusak ozon atau penyebab pemanasan global. Karena itu, diperlukan alternatif refrigeran alamiah yang ramah lingkungan diantaranya yaitu hidrokarbon. Sistem refrigerasi Autocascade memiliki karakteristik yang tergantung pada refrigeran dan komponen dari sistem terutama alat ekspansi yang dalam hal ini digunakan pipa kapiler maka dari itu dilakukan penelitian optimalisasi variasi panjang pipa kapiler pada mesin pendingin autocascade dengan campuran refrigeran hidrokarbon. Penelitian ini menginvestigasi sistem refrigerasi autocascade yang menggunakan empat campuran refrigeran dan variasi panjang pipa kapiler dengan diameter 0.028 inch. Refrigeran yang digunakan adalah Butana, propane, etana, dan metana dengan komposisi campuran 29% butana, 50% propane, 19,3% etana, dan 1.7% metana.Variasi panjang pipa kapiler yang dilakukan pada dua titik ekspansi adalah dengan mengkombinasikan antara panjang 15 m dengan 2 m. Penelitian ini menunjukkan bahwa temperatur evaporasi terendah diperoleh pada kombinasi panjang pipa kapiler pada ekspansi I adalah 2 m dan ekspansi II adalah 2 m.

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Medical and biomedical sciences in the development treatment require cold storage capable of reaching -80°C temperatures. To achieve such a low temperature refrigeration systems used autocascade. During this autocascade refrigeration systems using refrigerants that contain ozone-depleting substances or the cause of global warming. Hence, it needs alternatives that are environmentally friendly natural refrigerants among which hydrocarbons. Autocascade refrigeration systems have characteristics that depend on the refrigerant and the components of the system, especially the expansion device used in this case the capillary tube from the optimization study was carried out capillary tube length variation in engine cooling autocascade with a mixture of hydrocarbon refrigerants.

This study investigates autocascade refrigeration system that uses a mixture of four refrigerant and variations of the length of the capillary tube with a diameter 0028 inch. Refrigerant used is butane, propane, ethane, and methane with a mixture composition of 29% butane, 50% propane, 19,3% ethane, and 1.7% metana.Variations of capillary tube length is done between two points of expansions that combine 15 m and 2 m lengt. This study shows that the lowest evaporation temperature obtained on a combination of capillary tube length of the expansion I is 2 m and expansion II is 2 m."

"Beberapa tahun terakhir pengembangan teknologi pipa kalor melingkar (LHP) terus dilakukan. Pengembangan pipa kalor melingkar LHP banyak digunakan dalam berbagai bidang teknologi, seperti manajemen termal dari sistem pesawat ruang angkasa [3], solar kolektor [4] pendingin elektronik [5] dll. Beberapa penelitian juga melakukan pengembangan pada bentuk evaporator, sumbu kapiler dan fluida kerja pada pipa kalor. Meskipun pipa kalor telah dipelajari dan digunakan pada manajemen termal secara luas, masih sulit untuk mengetahui perilaku perubahan fase dalam evaporator dan kondensor hanya dengan bantuan pengukuran temperature dari permasalahan tersebut akan dilakukan sebuah penelitian tentang compensation chamber pipa kalor melingkar, Oleh karena itu, diperlukan untuk membuat visualisasi Pipa Kalor Melingkar (LHP) untuk memiliki pemahaman yang mendalam tentang perubahan fase dalam LHP.Pada penelitian ini akan dibagi menjadi dua parameter pengujian, yaitu yang pertama akan melakukan pengujian kinerja perpindahan panas compensation chamber LHP dan parameter pengujian kedua yaitu dengan melakukan visualisasi dengan membuat compensation chamber LHP dengan menggunakan kaca pyrex untuk mengamati fenomena perubahan fase. Dengan divariasikannya rasio pengisian dan jenis fluida kerja. Dari penelitian ini fluida kerja dengan rasio pengisian 60% dari volume total dan fluida kerja nano fluia Al2O3-Air 3% menghasilkan kinerja terbaik.

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The last few years the development of loop heat pipes technology (LHP) continues. Development of loop heat pipes LHP widely used in various fields of technology, such as thermal management of spacecraft systems [3], solar collectors [4] electronic cooling [5] etc.. Some studies also doing development in the form of an evaporator, a capillary wick and a working fluid in the loop heat pipe. Although the loop heat pipe has been studied and used extensively in thermal management, it is still difficult to determine the behavior of phase change in the evaporator and condenser temperature measurement only with the help of these issues will be carried out a study on compensation chamber heat pipe circular, therefore, necessary to make visualization on loop Heat Pipe (LHP) to have a deep understanding of phase changes in the LHP.In this study will be divided into two testing parameters, namely the first one to do performance testing of heat transfer LHP compensation chamber and the second test parameters by performing the visualization by making LHP compensation chamber using a pyrex glass to observe the phase change phenomena. With filling ratio and the type of working fluid as variations. From this study, the working fluid with filling ratio of 60% of the total volume and the working fluid nanofluids Al2O3-water 3% yield the best performance."

"[ABSTRAKLatar belakang : Hiperglikemia kronik pada pasien Diabetes melitus tipe 1 (DMT1) dihubungkan dengan kerusakan jangka panjang, gangguan fungsi dan kerusakan berbagai organ tubuh lain seperti mata, ginjal, saraf, jantung dan pembuluh kapiler. Salah satu gangguan fungsi organ yang sering diabaikan sebagai akibat hiperglikemia adalah faal paru. Uji fungsi paru dapat membedakan kelainan paru obstruktif, restriktif atau campuran antara obstruktif dn restriktif. Uji fungsi paru dengan spirometri tidak dapat dilakukan dengan baik pada anak dibawah usia 7 atau 8 tahun karena memerlukan koordinasi yang cukup sulit. Penelitian tentang dampak DMT1 terhadap paru di Indonesia belum ada sampai saat ini.Tujuan : Mengetahui gambaran uji fungsi paru pada pasien DMT1 usia 8-18 tahun.Metode : Penelitian potong lintang dilakukan di Poliklinik Endokrinologi dan Respirologi Rumah Sakit Cipto Mangunkusumo (RSCM), serta Laboratorium Prodia Salemba pada bulan Januari 2015. Wawancara orangtua dilakukan dan data kadar HbA1c dalam rentang satu tahun terakhir diambil dari rekam medis subjek atau berdasarkan hasil pemeriksaan sebelumnya. Uji fungsi paru dilakukan sebanyak tiga kali dan diambil salah satu hasil yang terbaik. Kemudian subjek menjalani pengambilan darah untuk pemeriksaan kadar HbA1c dengan metode cation-exchange high pressure liquod chromatography (HPLC) di Laboratorium Prodia.Hasil : Tiga puluh lima subjek berpartisipasi dalam penelitian, terdiri dari 68,6% perempuan. Rerata usia 14 ± 2,7 tahun dan median durasi DM adalah 4 tahun (1,3-10,2 tahun). Rerata parameter FEV1 adalah 86,8 ± 14%, FVC 82,7 ± 12% dan V25 83,1 ± 26,2%. Median FEV1/FVC adalah 92,4 % (77,6-100) dan V50 91,5 % (41,1-204). Fungsi paru normal didapatkan pada 19 subjek (54,3%) dan fungsi paru terganggu sebanyak 16 subjek (45,7%), terdiri dari 10 subjek (28,6%) gangguan restriktif, 2 subjek (5,7%) gangguan obstruktif dan 4 subjek (11,4%) gangguan campuran. Rerata HbA1c dalam 1 tahun terakhir pada subjek dengan gangguan restriktif adalah 10,3%. Simpulan : Nilai parameter uji fungsi paru pasien DMT1 usia 8-18 tahun masih dalam batas normal. Gangguan fungsi paru didapatkan pada 16 subjek (45,7%) dengan gangguan restriksi terbanyak yaitu 10 subjek (28,6%).

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ABSTRACTBackground: Chronic hyperglycemia in patients with type 1 diabetes mellitus (T1DM) is associated with long term functional impairment and damage of several parts of the body, such as eyes, kidneys, nerves, heart, and capillary blood vessels. Among all systems, disorder of pulmonary function due to hyperglycemia is often neglected by physicians. Pulmonary function test could determine whether the lung impairment is obstructive, restrictive, or mixed. Pulmonary function test using spirometry could not be applied to children below 7 or 8 years old because they are not capable to do the test. Until now, research about the effect of T1DM to pulmonary function has never been done in Indonesia.Objective: To obtain pulmonary function test profile in type 1 diabetes mellitus patients aged 8 to 18 years old.Methods: This cross sectional study took place at Endocrinology and Respirology Outpatient Department of Cipto Mangunkusumo Hospital (RSCM) and Prodia Laboratory Service in Salemba in January 2015. Parents of subjects were interviewed for history disease. HbA1c level of recent year was collected from medical records or from previous test results. Pulmonary function test were conducted three times to each subjects and among those three results, the best was chosen as data. Blood samples were collected for HbA1c level measurement. The HbA1c level was measured by cation-exchange high pressure liquod chromatography (HPLC) method in Prodia Laboratory.Results: Thirty five subjects participated in the research, 68.6% of them were female. The average age was 14 ± 2.7 years and the median duration of diabetes melitus was 4 years (1.3-10.2 years). FEV1, FVC, and V25 average was 86.8 ± 14%, 82.7 ± 12%, and 83.1 ± 26.2%, respectively. The median of FEV1/FVC and V50 was 92.4 % (77.6-100) and 91.5% (41.1-204) respectively. Nineteen subjects (54.3%) had normal pulmonary function and among 16 (45.7%) abnormal subjects, 10 (28.6%) had restrictive disorder, 2 (5.7%) had obstructive disorder, and 4 (11.4%) had mixed disorder. Average of HbA1c level of restrictive group was 10.3%.Conclusions: Pulmonary function test parameter profile in type 1 diabetes mellitus patients aged 8 to 18 years old lies in normal range. Pulmonary function disorder was found in 16 subjects (45.7%). Among those 16 subjects, 10 (28.6%) had restriction disorder.;Background: Chronic hyperglycemia in patients with type 1 diabetes mellitus (T1DM) is associated with long term functional impairment and damage of several parts of the body, such as eyes, kidneys, nerves, heart, and capillary blood vessels. Among all systems, disorder of pulmonary function due to hyperglycemia is often neglected by physicians. Pulmonary function test could determine whether the lung impairment is obstructive, restrictive, or mixed. Pulmonary function test using spirometry could not be applied to children below 7 or 8 years old because they are not capable to do the test. Until now, research about the effect of T1DM to pulmonary function has never been done in Indonesia. Objective: To obtain pulmonary function test profile in type 1 diabetes mellitus patients aged 8 to 18 years old. Methods: This cross sectional study took place at Endocrinology and Respirology Outpatient Department of Cipto Mangunkusumo Hospital (RSCM) and Prodia Laboratory Service in Salemba in January 2015. Parents of subjects were interviewed for history disease. HbA1c level of recent year was collected from medical records or from previous test results. Pulmonary function test were conducted three times to each subjects and among those three results, the best was chosen as data. Blood samples were collected for HbA1c level measurement. The HbA1c level was measured by cation-exchange high pressure liquod chromatography (HPLC) method in Prodia Laboratory. Results: Thirty five subjects participated in the research, 68.6% of them were female. The average age was 14 ± 2.7 years and the median duration of diabetes melitus was 4 years (1.3-10.2 years). FEV1, FVC, and V25 average was 86.8 ± 14%, 82.7 ± 12%, and 83.1 ± 26.2%, respectively. The median of FEV1/FVC and V50 was 92.4 % (77.6-100) and 91.5% (41.1-204) respectively. Nineteen subjects (54.3%) had normal pulmonary function and among 16 (45.7%) abnormal subjects, 10 (28.6%) had restrictive disorder, 2 (5.7%) had obstructive disorder, and 4 (11.4%) had mixed disorder. Average of HbA1c level of restrictive group was 10.3%. Conclusions: Pulmonary function test parameter profile in type 1 diabetes mellitus patients aged 8 to 18 years old lies in normal range. Pulmonary function disorder was found in 16 subjects (45.7%). Among those 16 subjects, 10 (28.6%) had restriction disorder., Background: Chronic hyperglycemia in patients with type 1 diabetes mellitus (T1DM) is associated with long term functional impairment and damage of several parts of the body, such as eyes, kidneys, nerves, heart, and capillary blood vessels. Among all systems, disorder of pulmonary function due to hyperglycemia is often neglected by physicians. Pulmonary function test could determine whether the lung impairment is obstructive, restrictive, or mixed. Pulmonary function test using spirometry could not be applied to children below 7 or 8 years old because they are not capable to do the test. Until now, research about the effect of T1DM to pulmonary function has never been done in Indonesia. Objective: To obtain pulmonary function test profile in type 1 diabetes mellitus patients aged 8 to 18 years old. Methods: This cross sectional study took place at Endocrinology and Respirology Outpatient Department of Cipto Mangunkusumo Hospital (RSCM) and Prodia Laboratory Service in Salemba in January 2015. Parents of subjects were interviewed for history disease. HbA1c level of recent year was collected from medical records or from previous test results. Pulmonary function test were conducted three times to each subjects and among those three results, the best was chosen as data. Blood samples were collected for HbA1c level measurement. The HbA1c level was measured by cation-exchange high pressure liquod chromatography (HPLC) method in Prodia Laboratory. Results: Thirty five subjects participated in the research, 68.6% of them were female. The average age was 14 ± 2.7 years and the median duration of diabetes melitus was 4 years (1.3-10.2 years). FEV1, FVC, and V25 average was 86.8 ± 14%, 82.7 ± 12%, and 83.1 ± 26.2%, respectively. The median of FEV1/FVC and V50 was 92.4 % (77.6-100) and 91.5% (41.1-204) respectively. Nineteen subjects (54.3%) had normal pulmonary function and among 16 (45.7%) abnormal subjects, 10 (28.6%) had restrictive disorder, 2 (5.7%) had obstructive disorder, and 4 (11.4%) had mixed disorder. Average of HbA1c level of restrictive group was 10.3%. Conclusions: Pulmonary function test parameter profile in type 1 diabetes mellitus patients aged 8 to 18 years old lies in normal range. Pulmonary function disorder was found in 16 subjects (45.7%). Among those 16 subjects, 10 (28.6%) had restriction disorder.]"

"Senyawa adenosin fosfat bervariasi jumlah gugus fosfatnya yakni adenosin monofosfat (AMP), adenosin difosfat (ADP) dan adenosin trifosfat (ATP). Untuk mendeteksi ketiga jenis senyawa secara simultan, dikembangkan sistem elektroforesis menggunakan detektor elektrokimia dengan elektroda boron-doped diamond. AMP, ADP dan ATP dalam bufer fosfat pH 7 memiliki kesamaan potensial oksidasi sekitar +0,93 Volt (vs. Ag/AgCl). Potensial yang sama juga ditemukan pada oksidasi adenin dan adenosin, yang mengindikasikan bahwa reaksi oksidasi terjadi pada gugus adenin. Elektroforesis kapiler dilakukan menggunakan kapiler fused silica(d: 0,05 mm). Dengan mengaplikasikan potensial 10 Kvolt, AMP, ADP dan ATP dapat dipisahkan dengan waktu retensi berturut-turut 1439 detik, 1202 detik dan 848 detik. Linieritas dapat dicapai untuk ketiga senyawa tersebut dengan batas deteksi beruturut-turut yakni 0,5946 μM, 0,5619 μM and 1,7795μM. Hasil tersebut menunjukkan bahwa elektroforesis berdetektor elektrokimia dapat digunakan untuk deteksi simultan senyawa adenosin fosfat AMP, ADP dan ATP.

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Adenosine phosphates were varied with the number of phosphate groups, including adenosine monophosphate (AMP), adenosine diphosphate (ADP), and adenosine triphosphate (ATP). In order to detect them simultaneously, a capillary electrophoresis coupled with electrochemical detection using boron-doped diamond electrode is developed. AMP, ADP and ATP in phosphate buffer pH 7 have similar oxidation potentials at around +0.9 V (vs. Ag/AgCl). This potential is also similar to that of adenin and adenosine, indicated that the oxidation occurred at adenin moiety.

Capillary electrophoresis, which was then performed using fused silica capilar (d: 0,05 mm) at an appied potentials of 10 KVolt can separate the adenosine phosphate AMP, ADP and ATP with the retention times of 848 s, 1202 s, and 1439 s, respectively. Liniear calibration curve can be achieved with the limits of detection of 0,5946 μM , 0,5619 μM and 1,7795μM, respectively the result shows that electrophoresys with electrochemical detector is promising for simultaneous detection of adenine phosphates."

"Drag atau hambatan alir yang dialami oleh suatu fluida tergantung dari besarnya gaya geser (shear stress) atau τ yang dimiliki oleh fluida tersebut. Apabila suatu fluida dalam hal ini air dan minyak sawit mentah ditambahkan suatu zat guar gum misalnya getah karet (latex) dengan konsentrasi tertentu maka nilai drag-nya akan bertambah. Besarnya nilai drag tergantung dari berapa besarnya kita menambahkan campuran aditif tersebut ke dalam larutan. Penelitian ini bertujuan untuk mengetahui pengaruh campuran zat aditif dalam hal ini getah karet terhadap aliran air & minyak sawit mentah dan untuk mengenali tipe alirannya dengan menggunakan pipa kapiler vertikal. Pada pipa kapiler, fluida uji dibuat mengalir melalui tiga ukuran diameter pipa yang berbeda yang dihasilkan oleh berbagai tekanan hidrostatis. Hasil pengujian menunjukkan bahwa getah karet mengakibatkan kenaikan tegangan geser pada aliran air & minyak sawit mentah dibandingkan yang tidak dicampur getah karet dan akibat penambahan guar gum ke dalam air & minyak sawit mentah menyebabkan perubahan sifat-sifat dari fluida Newtonian menjadi fluida Non Newtonian.

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Drag or resisting of flow which happened of fluid depending of the large shear stress or the property by a fluid. If a fluid in the conditions, fresh water and crude palm oil added something particel of guar gum etc latex with some concentrating then value of the drag increase. value of the drag depending how to much we additing the additive blending into the solvent. The aim of research is to know the effect blending the particel of additive is the latex with the flow of water and crude palm oil and also to knowing the type of the flow with using a vertical capillary tube. In the capillary tube, the test fluid is made to flow through three different diameter tube as a result of various hydrostatic pressure. The experimental results indicated that the latex mengakibatkan increase shear stress of the crude palm oil and fresh water flow in comparison without blended of latex and the result of additing the guar gum into the crude palm oil and fresh water consequence properties changed the Newtonian fluid into the non-Newtonian fluid."

"Perkembangan teknologi yang sangat dituntut perkembangannya oleh manusia telah melahirkan banyak sekali kemajuan pada teknologi itu sendiri, salah satunya adalah terdapat pada bidang pengobatan dan biomedis dimana dalam perkembangannya memerlukan cold storage yang mampu mencapai temperatur -80°C. Penggunaan sistem refrigerasi siklus tunggal hanya dapat mencapai temperatur efektif sekitar -40°C. Untuk mecapai temperatur -80°C digunakanlah sistem refrigerasi dengan menggunakan 2 siklus tunggal (cascade). Selama ini penggunaan refrigeran pada sirkuit temperatur rendah masih menggunakan refrigeran yang mengandung zat perusak ozon atau penyebab pemanasan global, sehingga diperlukan alternatif refrigeran alamiah yang ramah lingkungan seperti hidrokarbon dan CO2. Sistem refrigerasi cascade memiliki karakteristik yang tergantung pada refrigeran dan komponen dari sistem terutama alat ekspansi yang dalam hal ini digunakan pipa kapiler. Oleh sebab ini dilakukan penelitian optimalisasi variasi panjang pipa kapiler pada mesin pendingin cascade dengan campuran Ethane dan CO2. Penelitian ini mengivestigasi sistem refrigerasi cascade yang menggunakan komposisi 70% Ethane dan 30% CO2 dan variasi panjang pipa kapiler dengan diameter 0.054 inch adalah 6 m dan 3 m.

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The development of technology is demanded by many people have think out many progress, one of them is on the development of medical and biomedical that requires cold storage that capable of reaching -80oC temperatur. The use of a single cycle refrigeration system only able to achieve effective cooling temperature of -40°C. To reach such a low temperature, cascade refrigeration system used. The low temperature-circuit cascade refrigeration systems that exist today still using refrigerants that contain ozone-depleting substances or the cause of global warming, thus it needs alternatives that are environmental friendly natural refrigerans such as hydrocarbon and CO2.

Cascade refrigeration system has characteristics that depend on the refrigeran and the components of the system, especially the expansion device used in this case the capillary tube. Because of that, optimization research was carried out capillary tube length variation in cooling engine cascade with a mixture of Ethane and CO2. This research investigates cascade refrigeration system that uses 70% Ethane and 30% CO2 composition in refrigerant mixture and variations of capillary tube length are 6 m and 3m with the diameter is 0.054 inch."

"[ABSTRAKKebutuhan terhadap teknologi baru dalam pipa kalor terus meningkat terutama dalam kemampuan sumbu kapiler mengalirkan fluida. Sebuah biomaterial telah dibuktikan memiliki performa yang baik untuk menjadi bahan dasar sumbu kapiler. Namun, penggunaannya membawa permasalahan tersendiri bagi lingkungan. Oleh karena itu diperlukan material yang dapat meniru atau bahkan melebihi performa dari koral. Lotus-Type Porous Material (LTP) diproyeksikan mampu mengalahkan performa koral. Pada penelitian ini dikembangkan fabrikasi LTP dengan metode slip-casting berbahan dasar serbuk tembaga dan memberikan hasil yang baik. Disamping itu parameter proses untuk menghasilkan LTP yang optimum juga didapatkan.ABSTRACTDemands on state of the art technology in heat pipe field rising especially in capillary pumping performance. Prior research concluded biomaterial has superior performance as basic material for capillary wick. However, it was followed by consequences of harnessing the ecosystem. A new material that mimick and exceed the performance of coral will be necessity. Lotus-Type Porous Material (LTP) projected can pass over performance of coral and it is proofed to be true through this research. Besides that, process parameter for fabricating optimum capillary wick with LTP configuration also being concluded., Demands on state of the art technology in heat pipe field rising especially in capillary pumping performance. Prior research concluded biomaterial has superior performance as basic material for capillary wick. However, it was followed by consequences of harnessing the ecosystem. A new material that mimick and exceed the performance of coral will be necessity. Lotus-Type Porous Material (LTP) projected can pass over performance of coral and it is proofed to be true through this research. Besides that, process parameter for fabricating optimum capillary wick with LTP configuration also being concluded.]"

"Penelitian ini bertujuan untuk membuat sebuah pipa kalor lurus yang menggunakan sumbu kapiler tembaga sinter melalui metode centrifugal casting serta melakukan pengujian meliputi tahanan termal dan temperatur steady state. Penelitian ini berfokus pada pencarian performa terbaik antara pipa kalor dengan tebal sumbu kapiler 1 mm dan 2 mm. Hasil yang didapat pada penelitian ini adalah bahwa pipa kalor dengan tebal sumbu kapiler 2 mm lebih unggul dari pipa kalor dengan tebal sumbu kapiler 1 mm, dikarenakan pipa kalor dengan tebal sumbu kapiler 1 mm mengalami fenomena dry out. Hal ini terlihat dari tahanan termal terkecil dari kedua pipa kalor yang bernilai 6,55 ºC/W untuk pipa kalor dengan sumbu kapiler 1 mm dan 1,54 ºC/W untuk pipa kalor dengan sumbu kapiler 2 mm. Dari segi temperatur evaporator pada kondisi steady state, pipa kalor dengan tebal sumbu kapiler 2 mm unggul dengan temperatur evaporator maksimum yaitu 80 ºC mengungguli pipa kalor dengan sumbu kapiler 1 mm dengan temperatur evaporator maksimum yang mencapai 220 ºC.

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This research aims is to create a straight heat pipe using centrifugal casting as wick fabrication and investigate its performance such as thermal resistance and steady state temperature. The wick is made from sintered copper. This research also looking for the best performance of heat pipe using 1 mm and 2 mm of wick thickness. The result is heat pipe with 2 mm wick thickness is better than 1 mm wick thickness in terms of thermal resistance and steady state temperature because the 1 mm wick heat pipe is run into dry out phenomenons. The smallest thermal resistance is 6.55 ºC/W for heat pipe using 1 mm wick and 1.54 ºC/W for heat pipe using 2 mm wick. The highest steady state temperature is 220 ºC for heat pipe using 1 mm wick and 80 ºC for heat pipe using 2 mm wick."

"Biomachining sebagai salah satu jenis mikrofabrikasi memiliki banyak potensi untuk terus dikembangkan. Metode ini telah terbukti mengungguli metode-metode lain pada bidang yang sama. Selain mampu menghasilkan panas yang lebih rendah sehingga tidak memberikan pengaruh termal pada benda kerja dan ramah lingkungan, dengan ukuran bakteri sebagai cutting tool yang berkisar antara 0.5 sampai 1 μm, metode ini mampu menghilangkan sebagian kecil bagian dari benda kerja. Didorong oleh keefisienannya tersebut, penulis melakukan penelitian yaitu memfabrikasi sumpu kapiler pada pipa kalor dengan metode biomachining. Pada selembar pelat tembaga dibuat pola dengan interval 1 mm, kemudian direndam pada kultur bakteri, divariasikan selama 24 jam dan 48 jam. Pelat ini lalu digulung dan dimasukkan ke dalam pipa tembaga berukuran 3/8 inchi. Hasil pengujian terhadap sumbu kapiler tersebut didapatkan nilai t yang berkisar antara 0.368 s sampai 0.460 s, lebih kecil dari metode slip casting yang menandakan permeabilitas yang lebih baik. Namun, nilai coefficient capillary pumping rate-nya berkisar antara 0.294 g/s sampai 0.347 g/s, masih di bawah metode slip casting dan material koral, menandakan performanya sebagai sumbu kapiler yang masih kurang dibandingkan dengan metode slip casting dan material koral. Hasil tersebut tidak mustahil untuk lebih ditingkatkan di masa yang akan datang.

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Biomachining as one type microfabrication has a lot of potential to be developed. This method has been proven to outperform other methods in the same plane. Aside from being able to produce a lower heat so there?s no thermal effect on the workpiece and environmentally friendly, with the size of the bacteria as a cutting tool that ranged from 0.5 to 1 μm, this method is able to eliminate a small part of the workpiece. Motivated by its efficiency, the author conducted a study that fabricate wick for heat pipe application using biomachining method. On the piece of copper plate created a pattern with intervals of 1 mm, and then soaked it in a bacterial culture, varied during 24 hours and 48 hours. This plate is then rolled up and inserted into 3/8 inch copper pipe.

The test results of the wick obtained by that method, t values ranged from 0.368s to 0.460s, lower than slip casting method indicating better permeability. However, the value of coefficient capillary pumping rate was ranged from 0.294 g /s to 0.347 g/s, still lower than slip casting method and coral material, indicating its performance as a capillary wick is still less compared with slip casting method and coral material. It's possible that the result can be improved in the future."