Artículos de revistas sobre el tema "Termal properties"
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Pribadi, Amatulhay. "Kajian Analisis Respon Struktur Bangunan Baja di Bawah Pengaruh Kombinasi Beban Termal (Kebakaran) dan Beban Angin. (Hal. 13-25)". RekaRacana: Jurnal Teknil Sipil 5, n.º 2 (25 de septiembre de 2019): 13. http://dx.doi.org/10.26760/rekaracana.v5i2.13.
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ABSTRAKBeban termal yang terjadi pada bangunan dapat mengakibatkan degradasi pada struktur baja dan menyebabkan keruntuhan. Penelitian ini menganalisis pengaruh beban termal disertai beban angin terhadap respon dari struktur bangunan baja lima belas lantai yang berfungsi sebagai perkantoran dengan mempertimbangkan degradasi propertis baja, reduksi beban hidup dan beban mati tambahan, serta kecepatan penanganan pemadaman. Simulasi terbagi menjadi tiga kasus yaitu penanganan pemadaman kebakaran cepat, penanganan pemadaman kebakaran lambat, dan penentuan beban termal kritis. Analisis struktur dilakukan dengan bantuan software ETABS. Hasil simulasi kebakaran menunjukkan semakin tinggi temperatur maka stress ratio dari elemen struktur makin membesar. Pada penentuan beban termal kritis diperoleh bahwa besar beban termal yang dapat menyebabkan minimal satu elemen struktur utama mengalami kegagalan pada umumnya berbeda pada lantai level bawah, tengah, dan atas. Pada studi kasus ini diperoleh beban temperatur kritis paling besar yaitu pada lantai level atas.Kata kunci: beban termal, degradasi propertis baja, kegagalan struktur ABSTRACTThermal load on the building can lead into the degradation of steel structure and cause collapse. This study analyze the effect of thermal along with wind loads on the response of fifteen stories steel structure building which serves as an office by considering the degradation of steel properties, the reduction of live load and super imposed dead load, and the speed of handling the extinguishing. This simulation is divided into three cases which are fast handling of extinguishing, slow handling of extinguishing, and the determination of the critical thermal load. Structural analysis will be done using the ETABS software. The result of fire simulation showed that when the temperature is higher, the stress ratio of structural elements will also expand. In the determination of the critical thermal load, it is obtained that the thermal loads which can cause failure in minimum one major structural element are generally different at the bottom, middle, and top level of stories. In this case study, the highest critical temperature load is on the top level.Keywords: thermal load, steel properties degradation, structure failure
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ARAS ELİBÜYÜK, Sultan, Mustafa ÇÖREKCİOĞLU, Asil YILMAZ, Fatma Filiz YILDIRIM, Perinur KOPTUR y Özlem DEMİR. "INVESTIGATION OF THE THERMAL INSULATION AND LIQUID TRANSFER PROPERTIES OF COLD PROTECTIVE CLOTHES PRODUCED FROM DIFFERENT FUNCTIONAL RAW MATERIALS". Mühendislik Bilimleri ve Tasarım Dergisi 11, n.º 1 (27 de marzo de 2023): 41–56. http://dx.doi.org/10.21923/jesd.1067591.
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Giysilerde estetik ve modaya uygunluğu yanı sıra, performans ve konfor özellikleri gibi önemli özellikler aranmaktadır. Giysilerin ısıl konfor sağlaması için, soğuğa karşı yüksek ısıl dirence sahip olması gerekmektedir. Çalışma kapsamında, seamless makinelerde termofizyolojik konfor özellikleri iyileştirilmiş içlikler, çevre dostu ürünler olarak geliştirilmiştir. Çeşitli çevre koşullarında yüksek ısı yalıtımı isteyen kişilerin kullanabileceği özellikler taşıması için çalışmalar yapılmıştır. Termal ısıl konforu etkileyebilecek üretim parametrelerini dikkate alarak üretimi gerçekleşen yün, NILIT-heat, polyester (PES), polipropilen (PA) ve özel fonksiyonel ipliklerle kombine edilmiş 10 adet numune üretilmiştir. Çalışmada, ısıl dirence sahip farklı yapıdaki termal kumaş türlerinin, ısıl direnç (Alambeta Parametreleri) ve MMT parametreleri incelenmiştir ve çok kriterli analiz sonucunda ise termal fonksiyonel özellikleri barından numuneler seçilmiştir. Isıl yalıtımın sağlanması için numunelerde daha çok yün, termal izolasyonlu özel ipliklerin özellikle PES ile kombinasyonu önerilirken, su buharı geçirgenliği beklenen bölgelerde ise; PES, PA ve yün kombinasyonlarının kullanımı uygun bulunmuştur.
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Irawan, Ochtafian Wahyu, Lutvin Susdiawan Pratama y Chairil Insani. "Analisis Termodinamika Siklus Pembangkit Listrik Tenaga Uap Kapasitas 1500 kW". JTM-ITI (Jurnal Teknik Mesin ITI) 5, n.º 3 (1 de diciembre de 2021): 109. http://dx.doi.org/10.31543/jtm.v5i3.579.
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Pembangkit Listrik digunakan untuk membangkitkan listrik dari berbagai sumber energi seperti pembangkit listrik tenaga uap (PLTU). PLTU ini memiliki kapasitas 1500 kW dengan data data yang telah diperoleh tekanan dan temperatur berdasarkan tabel properties of saturated water (liquid–vapor) temperature maka dapat dilakukan perhitungan kualitas campuran pada kondensor dan efisiensi termal pada suatu siklus pembangkit listrik tersebut. Uap jenuh memasuki turbin pada siklus Rankine ideal pada tekanan 20 bar dan mengalami ekspansi pada turbin sampai pada tekanan kondensor 2,5 bar. Dalam penelitian ini dilakukan perhitungan efisiensi termal siklus pembangkit listrik tenaga uap tersebut, kemudian setelah dilakukan perhitungan didapatkan hasil efisiensi termal siklus tersebut adalah 19,3%. Efisiensi termal dapat ditingkatkan dengan melakukan penurunan suhu dan tekanan pada kondensor, meningkatkan tekanan pada boiler, dan meningkatkan suhu ketika fluida kerja dalam keadaan superheated.
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Etu, Marianus R. V. T., Matheus Magnus Dwinanto y Jack Carol Adolf Pah. "Studi pengaruh suhu kondensasi R245FA, R515A, dan R1234ZE terhadap kinerja siklus Rankine organik". Jurnal Teknik Mesin Indonesia 17, n.º 2 (22 de octubre de 2022): 158–63. http://dx.doi.org/10.36289/jtmi.v17i2.328.
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Siklus Rankine organik telah digunakan sebagai pembangkit listrik yang memanfaatkan sumber kalor bersuhu rendah seperti biomassa, panas bumi, dan limbah kalor dari pembangkit listrik konvensional. Kajian ini dilakukan untuk menganalisis kinerja energi siklus Rankine organik sebagai akibat perubahan suhu kondensasi menggunakan fluida kerja yang lebih ramah lingkungan sebagai pengganti R245FA, yaitu R515A dan R1234ZE. Kinerja sistem didasarkan pada variasi suhu kondensasi menggunakan perangkat lunak Genetron Properties dengan suhu evaporasi dipertahankan konstan. Besaran-besaran penting yang dianalisis adalah laju aliran massa, daya pemompaan, penyerapan kalor, rasio tekanan turbin, dan efisiensi termal. Hasil kajian ini menunjukkan bahwa peningkatan suhu kondensasi sangat berdampak pada meningkatnya konsumsi daya pemompaan tetapi menurunkan rasio tekanan di turbin, dan efisiensi termal sistem. Daya pemompaan yang digunakan untuk menyirkulasikan R515A dan R1234ZE lebih besar dibandingkan dengan untuk menyirkulasikan R245FA, tetapi efisiensi termal sistem ORC yang menggunakan R1234ZE lebih besar dibandingkan R245FA dan R515A.
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AY, Burak. "Synthesis, Characterization, Investigation of Catalytic and Thermal Properties of Three-Dimensional and Layered Copper Organodiphosphonate Coordination Polymer". International Journal of Advances in Engineering and Pure Sciences 35, n.º 4 (10 de noviembre de 2023): 428–38. http://dx.doi.org/10.7240/jeps.1284405.
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Bu çalışmada, (1,4-fenilenbis(metilen))bis(fosfonik asit) ligandı (H4L) ve katmanlı yapıya sahip bakır organodifosfonat polimeri, [Cu2(C8H8O6P2)(H2O)2]n (1), sentezlenmiştir. Sentezlenen bileşiklerin yapıları çeşitli spektroskopik ve analitik yöntemler kullanılarak karakterize edilmiştir. Tek kristal X-ray analizi sonucunda 1 nolu bileşiğin üç boyutlu ve sütunlu tabaka yapısında organik/inorganik katmanlardan oluştuğu gözlenmiştir. Monoklinik kristal sistemi ve P21/c uzay grubunda olan bileşik 1'in hücre parametreleri a = 10.8142(9) Å, b = 7.5839(6) Å, c = 7.3991(6) Å, V = 606.26(9) Å3 ve Z= 4'tür. Polimer zinciri içinde her bir bakır atomu toplam beş koordinasyona sahip olup kısmen bozulmuş kare piramit geometridedir. 1 polimerinin heterojen katalitik aktivitesi ve termal özellikleri incelenmiştir. TG analizi sonuncunda katalizörün 200 ᵒC sıcaklığa kadar termal kararlılığa sahip olduğu gözlenmiştir. TBHP kullanarak 60 ᵒC sıcaklıkta ve 12 saat sonunda %92.37 timol dönüşümü meydana gelmiştir.
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Telaumbanua, Janet S. y Eka Maulana. "PERANCANGAN SISTEM TERMAL PADA ORC KAPASITAS 10 KW". JURNAL PENELITIAN DAN KARYA ILMIAH LEMBAGA PENELITIAN UNIVERSITAS TRISAKTI 5, n.º 2 (21 de julio de 2020): 51. http://dx.doi.org/10.25105/pdk.v5i2.7358.
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<p>Tujuan perancangan sistem ini adalah untuk mengetahui penggabungan sistem dalam memanfaatkan energi panas yang terbuang dari teknologi pirolisis dan siklus organik rankine menggunakan metode perancangan Pahl & Beitz. Pada proses sistem kerja siklus organik rankine menggunakan fluida kerja R-134a dengan mempertimbangkan ODP, GWP, Life Time Atmosphere serta komponen yang digunakan pada sistem ini adalah jenis turbin uap impuls, kondensor berkependinginan air, pompa sentrifugal, alat penukar kalor Shell and Tube. Efisiensi penggabungan pirolisis dengan sistem siklus organik rankine bernilai 16% dengan kadar uap masuk turbin 96% dan hasil kerja turbin 38,7 kJ/kg, kerja kondensor 194,51 kJ/kg, kerja pompa 1 kJ/kg dan evaporator 234,2 kJ/kg. Hasil perhitungan dengan laju aliran massa 2kg/s, Temperatur masuk turbin 40 oC dan tekanan 1,6 MPa adalah 77,37 MW. Dari hasil perhitungan dan perkiraan perancangan daya yang dihasilkan turbin memiliki nilai beda yang besar disebabkan oleh entalpi dan entropi pada tabel properties fluida kerja memiliki nilai yang besar.</p>
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Fauzi, Ahmad. "PREDIKSI ANALITIK SUHU SOLAR ARRAY SATELIT". Transmisi 21, n.º 1 (1 de marzo de 2019): 10. http://dx.doi.org/10.14710/transmisi.21.1.10-14.
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Tujuan utama dari penggunaan coating paint pada sistem kendali termal satelit adalah menjaga semua elemen-elemen sistem satelit sesuai dengan batasan suhu operasional satelit. Panel surya sebagai sub sistem power satelit berfungsi menyediakan daya yang dibutuhkan untuk operasional satelit yang disimpan dalam baterai setelah melalui perubahan energi, dari energi matahari ke bentuk energi listrik yang tersimpan dalam baterai. Energi yang tersimpan dalam baterai merupakan sumber daya satelit yang digunakan saat satelit dalam kondisi eclipse. Makalah ini membahas pemilihan finishing permukaan array surya satelit dari empat jenis yang ada dengan analisa penggunaan tiga buah coating paint dengan optical properties untuk sisi belakang array surya. Solar reflector dengan menggunakan coating white paint SG 121-FD dipilih sebagai finishing permukaan array surya desain power termal satelit karena mempunyai nilai emissivity yang tinggi dan nilai absorptivity yang rendah.
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Dadalı, Ceyda y Duygu Kışla. "Kek ve Pilice İnoküle Edilen Salmonella Enteritidis’in Termal İnaktivasyonu". Turkish Journal of Agriculture - Food Science and Technology 6, n.º 4 (9 de abril de 2018): 401. http://dx.doi.org/10.24925/turjaf.v6i4.401-407.1443.
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In this study, thermal inactivation of Salmonella Enteritidis inoculated to the cake dough and a whole raw chicken was investigated. The cake dough was inoculated with 6.15 log-cfu/g S. Enteritidis then, thermal treatment was applied at 160°C top-bottom fan cooking mode. The initial count of S. Enteritidis showed reductions 1.49 log-cfu/g, 2.06 log-cfu/g and 4.29 log-cfu/g in the samples from the cold point location from the geometric center of the cake at 5, 7 and 10 minutes of thermal treatment, respectively. Although S. Enteritidis is not detected at the end of 15 minutes of heat treatment, the center of the cake temperature has reached 85.69°C and the cake sample is uncooked and its sensory properties are not acceptable. The cake that is safe and favorable with the sensory properties to the consumers was obtained by heat treatment for 30 minutes. After the cold point of a whole raw chicken was inoculated with 7.29 log-cfu/g S. Enteritidis, thermal treatment was applied at 220°C top-bottom fan cooking mode. The temperature at the cold point of 35 and 45 minutes heat-treated chickens reached 59.33 and 74.08°C, respectively, and 1.93 log-cfu/g and 5.33 log-cfu /g S. Enteritidis reduction caused in the samples respectively. S. Enteritidis cells were not detected in the whole chicken heat treated at 220°C for 60 minutes. The cakes, heat treated at 160°C top-bottom fan cooking mode for 30 minutes, were stored at two different storage temperatures as 4°C and 25°C for 72 hours. The whole chicken, heat treated at 220°C top-bottom fan cooking mode for 60 minutes, was stored at 4°C for 72 hours. S. Enteritidis cells were not detected in the cake and the whole chicken samples after the storage period.
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Riano, Riza, Sulistioso Giat Sukaryo, Bambang Sugeng, Yessie Widya Sari y Akhiruddin Maddu. "Karakterisasi Sifat Listrik Dan Sifat Termal Hidroksiapatit, Fluorhidroksiapatit Dan Fluorapatit". JURNAL Al-AZHAR INDONESIA SERI SAINS DAN TEKNOLOGI 7, n.º 3 (21 de septiembre de 2022): 147. http://dx.doi.org/10.36722/sst.v7i3.1128.
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<p><strong>The apatite compound that is often used in medicine and dentistry is hydroxyapatite with the chemical formula Ca10(PO4)6(OH)2. Fluor ions can substitute hydroxyl ions from hydroxyapatite to form crystals with the formula Ca (PO4)6(OH)2-xF2x, with the value of x indicating the index number of hydroxyl groups (OH-) replaced by fluor ions (F-). This study aims to determine the effect of fluor ion substitution on hydroxyapatite on electrical properties and thermal stability. In this study, the hydrothermal method was characterized by X-Ray diffractometer (XRD), Fourier Transform Infra-Red Spectroscopy (FTIR), LCR meter, Thermogravimetry Analysis (DTA), and Differential Thermal Analysis (TGA). The XRD and FTIR analysis results showed that the samples obtained were in the form of hydroxyapatite, fluorhydroxyapatite, and fluorapatite, which was also indicated by the presence of functional groups PO43-, CO32-, and OH- group libration mode at a wavenumber of 740 cm-1. There was a decrease in the lattice parameter a and an increase in the crystal size as the substitution of fluor ions increased. Based on the results of the electrical and thermal properties characterization, fluorapatite has the highest conductivity and better thermal stability when compared to hydroxyapatite and fluohydroxyapatite.</strong><strong></strong></p><p><strong><em>Keywords</em></strong> – <em>Fluor, </em><em>Hydroxyapatite, Hydrothermal, eggshell, Biomaterial</em></p>
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Ayuningtyas, Nurina Vidya y Jatmika Adi Suryabrata. "Analisis material dinding yang berpegaruh terhadap tingkat kenyamanan termal bangunan; studi kasus bangunan rumah tinggal desain dari Puslitbang Perumahan dan Permukiman Kementrian Pekerjaan Umum". JURNAL ARSITEKTUR PENDAPA 2, n.º 1 (14 de noviembre de 2019): 11–19. http://dx.doi.org/10.37631/pendapa.v2i1.64.
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Latar belakang yang sudah ada mengenai upaya mencapai suhu yang nyaman ini tidak dapat hanya diselesaikan dari sisi sistem mekanikalnya, namun pendekatan arsitektural dari desain konfigurasi selubung bangunannya yang mampu membantu dan memberikan efek nyaman bagi penghuninya. Penelitian ini dilakukan dengan tujuan untuk mengetahui tingkat kenyamanan termal atau suhu di dalam ruangan sebuah desain rumah tinggal dengan menerapkan beberapa material dinding yang berbeda-beda sehingga didapatkan nilai perbandingan tingkat kenyamanan termal setiap material dinding yang diaplikasikan. Jenis penelitian ini adalah penelitian dengan menggunakan metode simulasi melalui model komputer (computer model). Berdasar hasil analisis sesuai hasil simulasi yang didapat, maka pemilihan material pada menggunakan batako, bata dan bata ringan secara karakteristik memiliki sifat bahan yang mirip. Hal ini dikarekan karakter “thermal properties”ketiga bahan ini tidak jauh beda. Berbeda dengan material kayu, berdasar hasil simulai untuk memperoleh Surface Inside Temperature, Mean Radiant Temperature dan Opertaive Temperature mendapat hasil suhu/temperatur paling tinggi.
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Lobo, Jefrianto, Matheus M. Dwinanto y Nurhayati Nurhayati. "Studi Pengaruh Temperatur Kondensasi Terhadap Kinerja Siklus Rankine Organik Menggunakan Fluida Kerja R245FA Dan R515A". LONTAR Jurnal Teknik Mesin Undana 9, n.º 01 (27 de mayo de 2022): 28–33. http://dx.doi.org/10.35508/ljtmu.v9i01.7271.
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Sejak tahun 2000 pembangkit listrik dengan siklus Rankine organik (organic Rankine cycle/ORC) adalah yang paling banyak digunakan di dunia yang memanfaatkan sumber kalor bertemperatur rendah seperti limbah kalor industri, biomassa, geothermal, dan energi surya. Fluida kerja untuk sistem ORC harus memenuhi beberapa kriteria sifat fisik diantaranya, ramah lingkungan, tidak mudah terbakar, tidak beracun, dan tidak korosif. Oleh karena itu, penelitian ini bertujuan untuk menganalisis pengaruh temperatur kondensasi terhadap kinerja termodinamika siklus Rankine organik standar berdaya turbin 20 kW dengan fluida kerja R245fa, dan R515A. Simulasi kinerja sistem menggunakan perangkat lunak Genetron Properties dengan temperatur evaporasi dipertahankan konstan pada 80oC dan temperatur kondensasi divariasikan pada 30 – 40oC. Hasil studi ini menunjukkan bahwa peningkatan temperatur kondensasi sangat berdampak pada meningkatnya konsumsi daya pemompaan tetapi menurunkan rasio tekanan di turbin, dan efisiensi termal sistem. Daya pemompaan yang digunakan untuk mensirkulasikan R515A ±2,2 kali lebih tinggi dibandingkan mensirkulasikan. Efisiensi termal sistem ORC yang menggunakan kedua fluida kerja yang ditinjau tidak memiliki perbedaan yang signifikan
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Krasil’nikov, V., O. Gyrdasova, A. Tyutyunnik, T. Diachkova, I. Baklanova, V. Marchenkov, A. Domozhirova y V. Bamburov. "Termal and Magnetic Properties of Maghemite γ-Fe2O3 Synthesized by a Precursor Method". Доклады академии наук 481, n.º 4 (agosto de 2018): 386–90. http://dx.doi.org/10.31857/s086956520001743-0.
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Vollbrecht, Laysa Teles, Adriano Reis Prazeres Mascarenhas, Rafael Rodolfo de Melo, Maúcha Fernanda de Mota Lima, Ricardo Pereira Soteil y Alexandre Santos Pimenta. "Effects of termal treatment on the physical properties of Buchenavia sp. (branquilho) wood". Ambiente Construído 22, n.º 1 (diciembre de 2022): 95–103. http://dx.doi.org/10.1590/s1678-86212022000100580.
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Abstract This work aimed to evaluate the effect of heat treatment on the physical properties of wood from Buchenavia sp. The heat treatments were carried out at temperatures of 180 °C and 200 °C for 2 h. Apparent density (AD), basic density (BD), porosity (Ф), mass loss, longitudinal (LS), radial (RS), tangential (TS) and volumetric (VS) shrinkages and anisotropic factor (AF) were determined. The lowest values of basic density (0.67 g cm-3), apparent density (0.77 gcm-3), and porosity (43.3%) were observed for the wood treated at a temperature of 200 °C. Mass losses increased with increasing temperature and the highest values were observed under the condition of 200 °C (9.3%). The LS and AF was not affected by heat treatments. The mean values for RS (3.1%), TS (5.1%), and VS (9.1%) were reduced after the performance of heat treatments at temperatures of 180°C and 200°C, which did not differ from each other. The thermal treatments were able to reduce the dimensional instability of Buchenavia sp. Thermal treatments enhance the use of less prestigious Amazonian woods in the civil construction market.
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Musliman, Acep y Fitri Damayanti. "ANALISIS MEKANIK DAN TERMAL MATERIAL KOMPOSIT BERBASIS SERAT ECENG GONDOK SEBAGAI BAHAN KEMASAN RAMAH LINGKUNGAN". JOURNAL ONLINE OF PHYSICS 9, n.º 1 (2 de noviembre de 2023): 98–103. http://dx.doi.org/10.22437/jop.v9i1.28125.
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This study aims to analyze the mechanical and thermal properties of water hyacinth fiber-based composite materials as an alternative to environmentally friendly packaging materials. This composite material is produced by mixing water hyacinth fiber with a natural polymer matrix that can decompose easily. Manufacturing methods include mixing, pressing, and thermal treatment processes. The mechanical properties of composite materials, including tensile strength and resistance to deformation, are tested using tensile tests and hardness tests. Thermal analysis is carried out through thermogravimetric tests (TGA) to identify the thermal stability and decomposition of the material. The results showed that the water hyacinth fiber-based composite materials had fairly good mechanical properties in certain mixture compositions, although they were not as strong as composite materials using synthetic fibers. However, this material shows potential in packaging applications that do not require extreme mechanical strength. The mechanical properties of the water hyacinth fiber composite produced lead to the fulfillment of the need for use as packaging, which is light, flexible and not easily broken. The thermal properties of the composites show faster decomposition compared to synthetic fiber based composites, but are still within the acceptable range for single-use packaging. With its environmentally friendly properties, this composite material can be an attractive alternative to reduce the use of plastic in the packaging industry. Nonetheless, improvements in manufacturing processes and material formulations are still required to improve their mechanical and thermal properties and maintain packaging durability under diverse usage conditions.
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Ermeydan, Mahmut Ali y Onur Aykanat. "INVESTIGATION OF THERMAL AND MECHANICAL PROPERTIES OF PLA/HORN BIOCOMPOSITES". E-journal of New World Sciences Academy 14, n.º 4 (1 de noviembre de 2019): 217–31. http://dx.doi.org/10.12739/nwsa.2019.14.4.1a0444.
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Mudiastuti, Sri, Armansyah Tambunan y Arthur Simbolon. "Eksperimental dan Teoritis Analisis Sifat Termal di Zephyr Bambu Tali (Gigantochloa apus Kurz)". Jurnal Keteknikan Pertanian 25, n.º 2 (1 de octubre de 2011): 111–18. http://dx.doi.org/10.19028/jtep.25.2.111-118.
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Mirmanto, M., S. Sugiman, F. Fathurrahman y M. D. Ramadhani. "Konduktivitas termal komposit resin epoksi dan serbuk arang tempurung kelapa". Dinamika Teknik Mesin 12, n.º 1 (1 de abril de 2022): 29. http://dx.doi.org/10.29303/dtm.v12i1.502.
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Composite materials are materials that are widely developed and their use has been widespread in various industrial and household sectors. Epoxy composites filled with coconut shell charcoal powder have been tested for their thermal conductivity properties using the one-dimensional conduction method. The tested specimens had dimensions of 50 mm x 50 mm x 5 mm made of epoxy and coconut shell powder with a percentage of charcoal weight of 0%, 10%, 20% and 30%. The specimen is inserted into a thermal conductivity measuring instrument made of solid aluminum which is insulated around it. The heater is mounted on the aluminum as a heat source, while the other end is left open to the free air in the room. The results showed that the highest average thermal conductivity was a 30% variation of 0.5003 W/m°C, then a 20% variation of 0.3738 W/m°C, a 10% variation of 0.3487 W/m°C. and the lowest at 0% variation without using coconut shell charcoal powder at 0.1364 W/m°C.
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Ardaniswari, Deafani Wahyu, Josalina Josalina, Hana Haritsah y Simon Sembiring. "Karakteristik Termal dan Fungsionalitas Komposit Silika Sekam Padi dengan Aspal". Jurnal Teori dan Aplikasi Fisika 8, n.º 1 (31 de enero de 2020): 101–10. http://dx.doi.org/10.23960/jtaf.v8i1.2450.
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This research was carried out to investigate the effect of asphalt addition to thermal characteristics, functional groups, physical properties (water absorption, water content, and swelling thickness) of rice husk silica. The mass ratio of silica and asphalt alloys were 1:0; 1:0,4; 1:0,5; and 1:0,6. Silica and asphalt were mixed at 160˚C followed by calcination at 150˚C for 3 hours. Thermal characteristics and phase structures were analyzed using Differential Thermal Analysis/Thermo Gravimetrical Analysis (DTA/TGA), X-ray Diffraction (XRD), and Fourier Transform Infrared (FTIR). DTA/TGA analysis results show that the addition of asphalt causes a decreasing in mass, on set temperature, maximum temperature, endothermic temperature And an increase in exothermic peak temperature. The results of XRD analysis showed that the addition of asphalt resulted in the appearance of amorphous carbon, shifting the range and the highest intensity of 2θ amorphous silica. The results of FTIR analysis showed that the addition of asphalt resulted in appearance the functional grups of C-H. The addition of asphalt causes a decrease in the value of water absorption, water content, and swelling thickness.
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Gorbunova, M. A., D. M. Shukhardin, V. A. Lesnichaya, E. R. Badamshina y Denis V. Anokhin. "New Polyurethane Urea Thermoplastic Elastomers with Controlled Mechanical and Thermal Properties for Medical Applications". Key Engineering Materials 816 (agosto de 2019): 187–91. http://dx.doi.org/10.4028/www.scientific.net/kem.816.187.
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The method of synthesis of new polyurethane urea thermoplastic elastomers with controlled physical network density by varying the crystallization rate of the soft block and the structure of the interphase has been developed. Fine-tuning of morphology and mechanical properties allows to desighn adaptive materials with shape memory. By combination of calorimetric and X-ray diffraction methods, the influence of chemical nature of diaisocyanates and the ratio of two types of crystallizable blocks, polybutylene glycol adipate diol (PBA) and poly-ε-caprolactone diol (PCL), on the structure and termal behavior of the thermoplastic elastomers has been studied.
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TÜRE, Yiğit. "Bazı Magnezyum Alaşımlarında Sürünme Hızı, Termal İletkenlik ve Karışım Entalpisi Arasındaki İlişkinin İncelenmesi". Karadeniz Fen Bilimleri Dergisi 13, n.º 4 (15 de diciembre de 2023): 1476–89. http://dx.doi.org/10.31466/kfbd.1299160.
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Magnesium (Mg) and its alloys are known for their high specific strength, but they have limitations that need to be addressed to expand their range of industrial use. One major limitation is their high temperature performance, which requires improvement for them to be used in industries such as aviation where creep resistance is important. In this study, we investigated the creep behavior of several Mg alloys, including the commercially used AZ series (AZ31, AZ61, and AZ91), as well as the AM50, AX52, and AE42 alloys. We studied the relationship between the creep rate of these alloys and two material properties: thermal conductivity and enthalpy of mixing. By analyzing these properties, we can compare and evaluate newly developed or existing alloys in terms of their creep behavior. When the obtained results are interpreted in general, a linear relationship is found between the creep rate, thermal conductivity and enthalpy of mixing as a general trend.
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Dewi, Sari Hasnah, Wisnu Ari Adi y Suyanti Suyanti. "Studi Fasa dan Sifat Termal Lantanum Oksida Berbasis Monasit". EKSPLORIUM 40, n.º 2 (30 de noviembre de 2019): 99. http://dx.doi.org/10.17146/eksplorium.2019.40.2.5646.
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ABSTRAKPotensi logam tanah jarang (LTJ) di Indonesia sangat besar, terutama yang berasal dari mineral monasit. Monasit merupakan gabungan unsur LTJ-U/Th-fosfat yang berkaitan dengan endapan timah dan unsur-unsur radioaktif. Melalui program BATAN incorporated mineral monasit diolah menjadi bahan yang lebih benilai jual secara ekonomi. Lantanum (La) adalah logam yang termasuk dalam kelompok logam tanah jarang yang memiliki sifat-sifat unggul sebagai pigmen dan sebagai penyerap gelombang elektromagnetik. Tujuan penelitian ini adalah memperoleh informasi pengaruh pemanasan tinggi terhadap produk pilot plant pengolahan logam tanah jarang hidroksida (RE(OH)3) dari monasit, khususnya produk La2(C2O4)3 untuk pembuatan Certified Reference Material (CRM) La2O3. Bahan yang telah ditimbang dikalsinasi pada combustion boat dengan menggunakan furnace pada suhu pemanasan 1.000 OC dan 1.300 OC. Dekomposisi termal dianalisis dengan menggunakan Thermogravimetric analysis (TGA). Formasi fasa bahan dianalisis dengan menggunakan teknik X-Ray Diffraction (XRD). Hasil analisis XRD menunjukkan hasil akhir fasa bahan berubah menjadi La2O3 sebesar 28,76% dan La(OH)3 sebesar 71,24%.ABSTRACTRare earth elements (REE) in Indonesia have great potency, mainly from monazite mineral. Monazite is a combination of REE-U/Th-phosphate elements which is associated with tin deposit and radioactive elements. Through BATAN incorporated program, monazite mineral is processed to become more economically valuable materials. Lanthanum (La) is a metal element, part of REE group, which has excellent properties for pigment and electromagnetic absorber. The purpose of this study is to obtain information related to the effect of calcination in high temperature on the product of monazite’s REE hydroxide (RE(OH)3) processing pilot plant, specific on La2(C4O4)3 for Certified Reference Material (CRM) La2O3 making. The weighed material is calcined on combustion boat by using a furnace at heating temperature of 1,000 OC and 1,300 OC. Thermal decomposition is analyzed by using Thermogravimetric analysis (TGA). Material phase formation is analyzed by using X-Ray Diffraction (XRD) method. XRD analysis shows the material in final phase has been transform to 28.76 % La2O3 and 71.24 % La(OH)3.
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Silvia, Silvia, Rochmi Widjajanti y Ida Nur Apriani. "Analisis Sifat Mekanik dan Sifat Termal Komposit Poliuretan Berpenguat Serat Nanas Dan Cangkang Kemiri". Jurnal Engine: Energi, Manufaktur, dan Material 6, n.º 2 (26 de noviembre de 2022): 01. http://dx.doi.org/10.30588/jeemm.v6i2.1038.
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<p><em>The development of materials that have good durability continues to grow rapidly. One way to increase the durability of a material is the manufacture of composite materials. Composite is a material consisting of a matrix and a reinforcing material. The purpose of this study is first to determine the best composition for fillers and matrix in the manufacture of polyurethane composites reinforced with pineapple fiber and candlenut shells, second to determine the mechanical properties of the composite material, and third to determine the thermal stability of the composite material. To find out the best composition results, tensile strength tests were carried out using the Universal Testing Machine (UTM) and thermal properties were tested using Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). In this study, variations in the composition of composite materials from polyurethane, pineapple fiber, candlenut shell powder and aluminum powder will be carried out with the percentages of filler and matrix of 50:50, 60:40 and 70:30 (%). Based on the results of the study, the composite with a variation of 50:50(%) has the best mechanical properties with a tensile strength 10,592 MPa, strain value </em>(<em>elongation at break</em>)<em> 0.7072% and modulus of elasticity (E) 5526,054 MPa. Stability termal of composite was found that the composition with the ratio of filler and matrix 60:40 (%) is the best composition based on the thermal properties. It has a melting temperature 287.4℃ and begins to decompose at temperature 292.65℃.</em></p>
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Forest, Jedy Green, Budi Siswanto y Anis Rahmawati. "PENGARUH PENGGANTIAN SEBAGIAN TANAH LIAT OLEH FLY ASH BATUBARA TERHADAP NILAI THERMAL PROPERTIES SEBAGAI UPAYA MEMETAKAN MATERIAL BATU BATA YANG RAMAH LINGKUNGAN". Jurnal Ilmiah Pendidikan Teknik dan Kejuruan 10, n.º 1 (31 de enero de 2017): 31. http://dx.doi.org/10.20961/jiptek.v10i1.14962.
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<p>Tujuan penelitian ini adalah untuk mengetahui: (1) pengaruh penggantian sebagian tanah liat oleh <em>fly ash</em> batubara terhadap nilai <em>thermal properties</em> batu bata; (2) persentase optimal penggantian sebagian tanah liat oleh <em>fly ash </em>batubara untuk mendapatkan batu bata dengan daya hambat panas maksimal; (3) nilai perbandingan <em>thermal properties</em> yang dihasilkan oleh batu bata dengan campuran <em>fly ash </em>batubara pada variasi campuran 0%, 15%, 30%, 40%, dan 50%. Penelitian ini merupakan penelitian kuantitatif dengan menggunakan metode eksperimen. Karakteristik batu bata yang diuji pada penelitian ini adalah berat jenis, susut bakar, porositas, kuat tekan, dan konduktivitas termal. Benda uji yang digunakan terbuat dari tanah liat dengan campuran <em>fly ash </em>batubara dengan dimensi 23 cm x 11 cm x 5 cm. Hasil penelitian adalah sebagai berikut ini. <em>Pertama, </em>ada pengaruh penggantian sebagian tanah liat oleh <em>fly ash </em>batubara terhadap nilai <em>thermal properties</em> (F<sub>hitung</sub> 57,927 > F<sub>tabel</sub> 4,67). <em>Kedua, </em>Persentase 50% merupakan persentase optimal penggantian sebagian tanah liat oleh <em>fly ash </em>batubara dengan daya hambat panas sebesar 0,201 Kcal/mhºC. <em>Ketiga, </em>nilai <em>thermal properties</em> yang dihasilkan oleh batu bata dengan campuran <em>fly ash </em>batubara pada variasi campuran 0%, 15%, 30%, 40%, dan 50% masing-masing untuk konduktivitas termal sebesar 0,362 Kcal/mhºC; 0,264 Kcal/mhºC; 0,282 Kcal/mhºC; 0,215 Kcal/mhºC; dan 0,201 Kcal/mhºC dan nilai densitas sebesar 1,35 gr/cm<sup>3</sup>; 1,18 gr/cm<sup>3</sup>; 1,14 gr/cm<sup>3</sup>; 1,02 gr/cm<sup>3</sup>; dan 0,98 gr/cm<sup>3</sup>.<strong></strong></p><p><strong> </strong></p><p><strong>Kata Kunci: </strong>batu bata, <em>fly ash </em>batubara, <em>thermal properties</em>, konduktivitas termal</p>
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YÜKSELOĞLU, Sevhan Müge. "Mechanical and Thermal Properties of Wool Waste Fabric Reinforced Composites". Tekstil ve Mühendis 22, n.º 97 (31 de marzo de 2015): 14–20. http://dx.doi.org/10.7216/130075992015229703.
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Kharis, Nofal Kharis, Hary Sutjahjono Sutjahjono, Digdo Listyadi Setyawan y Nasrul Ilminnafik Ilminnafik. "KARAKTERISTIK TERMAL CAMPURAN BIOSOLAR DAN BIODIESEL MINYAK BIJI RANDU (CEIBA PENTANDRA)". POROS 16, n.º 2 (27 de agosto de 2021): 169. http://dx.doi.org/10.24912/poros.v16i2.11655.
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Research involving thermal characteristics of mixture of biodiesel from kapok (ceibapentandra) and biosolar has been conducted. Biosolar and biodiesel mixed with 5 different composition:B0 (100% biodiesel), B10 (10% biodiesel), B20, B30, and B100 (100% biodiesel). Laboratory experimentwas conducted to obtain several fuel characteristics: heating value, flash point, density, and viscosity.Biosolar is evaporated at a temperature of 120°C and then the steam is flowed to a bunsen burner with afixed discharge (2 ml/minute) and mixed with air in the equivalent ratio variation (φ) 0.8; 1; and 1,2 andturned on. The resulting flame was recorded with the camera and an analysis of the flame was carriedout. Thermal characteristics of this biodiesel have properties in accordance with biosolar standards ofPT Pertamina Indonesia. The heating value of biosolar is 10,602 cal/gram and biodiesel is 8,641cal/gram, and the mixture has heating value among them. As for the characteristics of the flame with highheat values, the core of the flame is covered in blue which shows the highest heat value.
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Arda, Gede. "Aplikasi Plasma Dingin pada Produk Segar". Jurnal BETA (Biosistem dan Teknik Pertanian) 11, n.º 2 (30 de septiembre de 2023): 411. http://dx.doi.org/10.24843//jbeta.2023.v11.i02.p19.
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Plasma non-termal adalah gas terionisasi yang terdiri dari molekul netral, atom tereksitasi, dan molekul bermuatan. Beberapa molekul sangat reaktif sehingga bereaksi dengan cepat terhadap bahan organik atau non-organik. Karena sifatnya, plasma baru-baru ini diterapkan untuk mendekontaminasi produk pertanian dari berbagai kontaminan. Dalam produk segar seperti buah dan sayuran, plasma non-termal digunakan untuk membunuh bakteri dan mikroorganisme lain yang menempel pada permukaan produk, atau untuk mendegradasi residu pestisida yang melapisi produk. Kontaminan ini mempengaruhi kualitas produk dengan cara tertentu sehingga dapat mengurangi keuntungan yang diperoleh produsen, penangan, dan penjual. Beberapa mekanisme yang menjelaskan bagaimana plasma non-termal mengurangi tingkat kontaminan telah diusulkan oleh para peneliti. Intinya adalah spesies reaktif merusak dinding sel mikroorganisme sehingga tidak dapat hidup atau rusak, dan mereka juga dapat bereaksi terhadap senyawa pestisida dan mendegradasinya menjadi senyawa yang tidak terlalu berbahaya. Namun, spesies reaktif yang sama tidak hanya bereaksi terhadap materi target tetapi juga bereaksi terhadap jaringan produk di sekitar plasma yang diaplikasikan dan mempengaruhi kualitas produk yang diolah. Makalah ini mengulas pengaruh plasma non-termal terhadap kualitas produk segar dari sudut pandang fisik, fisiologis, kimia, dan mikrobiologis.
Non-thermal plasma is ionized gas which comprised of neutral molecules, excited atom, and charged molecules. Some of the molecules are so very reactive that react rapidly to almost organic or non-organic matter. Due to its properties, plasma is recently applied to decontaminate agricultural products from various contaminants. In the case of fresh produce such fruit and vegetable, non-thermal plasma is used to kill bacteria and other microorganisms attached to a product’s surface, or to degrade the pesticide residues coating the product. These contaminants affect product quality in a certain way thus, they could reduce the profit gain by producers, handlers, and sellers. Some mechanisms explained how non-thermal plasma reduce the level of contaminant have been proposed by researchers. The point are the reactive species damage the cell wall of microorganisms making them non-viable or damaged, and they could react to pesticide compounds as well and degrade them to less harmful compounds. However, the same reactive species not only react to target-matter but also react to product tissues around the plasma applied and affect the quality of the treated product. This paper reviews the effect of non-thermal plasma on fresh product quality from physical, physiological, chemical, and microbiological viewpoints.
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ÖZER, Tahsin y Nihat ARIKAN. "Investigation of Mechanical, Elastic and Thermodynamic Properties of Ni2VAl Compound". Afyon Kocatepe University Journal of Sciences and Engineering 23, n.º 2 (3 de mayo de 2023): 466–73. http://dx.doi.org/10.35414/akufemubid.1143362.
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Bu çalışmada teknolojik öneme haiz Heusler ailesinden Ni2VAl bileşiğinin yapısal, mekanik ve termo
dinamik özellikleri ilk prensipler yöntemi ile teorik olarak incelenmiştir. Öncelikle bileşiğin temel
durumunu ve en düşük enerji seviyesini belirlemek için yapısal optimizasyon yapılmış, yapısal
optimizasyon neticesinde elde edilen optimize parametreler kullanılarak elastik sabitler hesaplanmıştır.
Hesaplanan örgü parametresi önceki çalışmalar ile uyum içeresindedir. Ayrıca belirlenen elastik sabitler
mekanik kararlılık kriterlerini karşıladığından elastik modül, Vicker sertliği, erime sıcaklığı, Debye
sıcaklığı, ses hızları, minimum termal iletkenlik ve anizotropi incelenmiştir. Çalışılan malzemenin Vicker
sertliği ve sünek/kırılgan doğası analiz edilmiştir. Ayrıca iç enerji, titreşim enerjisi, entropi ve özgül ısı
kapasitesi 0-800 K sıcaklık aralığında değerlendirilmiştir. Hesaplamalarda açık kaynak Quantum
Espresso yazılımı ve bu yazılım ile dağıtımı yapılan thermo_pw paketi tercih edilmiştir. Yapılan çalışma
ile Ni2VAl bileşiğinin mekanik kararlı, sünek, anizotrop ve yumuşak olduğu görüldü.
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Sugita, Purwantiningsih. "Kajian Penggunaan Carbon Black N990 sebagai Bahan Pengisi Kompon Karet Alam: Sifat Dinamik, Kestabilan Termal, dan Ketahanan Panas". Jurnal Riset Kimia 14, n.º 1 (24 de marzo de 2023): 25–34. http://dx.doi.org/10.25077/jrk.v14i1.560.
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The manufacture of vibration damping material from natural rubber (NR) required an increase in dynamic properties, thermal stability, and resistance to heat. Using the Carbon Black N990 as a filler in NR vulcanizates can potentially increase on these properties. This research aims to study the effect of using Carbon Black N990 on dynamic properties, thermal stability, and aging resistance to heat in NR vulcanizates. The dynamic properties of NR vulcanizates were determined by Rubber Process Analyzer (RPA), while the thermal stability properties were studied by TGA, and heat resistance was determined by the thermal aging test. The RPA test results showed that adding 50 phr Carbon Black N990 in the NR compound could increase the value of the complex shear modulus to 65%. Furthermore, the results of the TGA test showed that the thermal stability properties of unfilled NR vulcanizates were better than that of NR vulcanizates containing Carbon Black N990. Unfilled NR vulcanizates were heat stable up to 353oC, while NR vulcanizates containing 15, 30, and 50 parts per hundred rubber (phr) Carbon Black N990, respectively, were heat stable up to 348.1oC, 348oC, and 349oC. Based on the requirements of ISO 4632-1, it showed that the NR compound containing Carbon Black N990 has good heat resistance properties. The NR compound formula contains 30 phr Carbon Black N990 showing good dynamic properties and heat resistance in accordance with EN 15129 requirements so that it has the potential to be used as a vibration damping material for earthquake-resistant structures.
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İlter, Zülfiye, Zehra Ergen y Serpil Yılmaz. "Investigation of Thermal Properties and Reactivity Ratios of Acetyl Benzofuran Methacrylate Copolymers". Afyon Kocatepe University Journal of Sciences and Engineering 18, n.º 1 (1 de abril de 2018): 103–11. http://dx.doi.org/10.5578/fmbd.66654.
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Pramono, Edi, Rosid Eka Mustofa, Ozi Adi Saputra, Yulianto Adi Nugroho, Deana Wahyunigrum, Cynthia Linaya Radiman, Sayekti Wahyuningsih et al. "Pengaruh Bentonit terhadap Pembentukan Fasa Polimorf dan Sifat Termal Membran Hibrida Poliviniliden Fluorida/Bentonit". ALCHEMY Jurnal Penelitian Kimia 17, n.º 2 (9 de septiembre de 2021): 177. http://dx.doi.org/10.20961/alchemy.17.2.46136.177-184.
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<p>Kajian struktur dan degradasi termal pada membran hibrida poliviniliden fluorida (PVDF)/lempung bentonit (BNT) telah dilakukan. Penelitian ini bertujuan mengetahui pengaruh penambahan BNT terhadap pembentukan fasa PVDF dan sifat termalnya. Membran hibrida PVDF/lempung BNT dibuat dengan metode inversi fasa. Membran yang dihasilkan dikarakterisasi dengan <em>attenuated total reflectance fourier transform infrared</em> (ATR-FTIR), <em>x-ray diffraction</em> (XRD), dan <em>differential scanning calorimetry</em> (DSC). Hasil penelitian menunjukkan membran PVDF/BNT memiliki struktur polimorf PVDF fasa α dan β yang terkonfirmasi dari data FTIR dan XRD. Data DSC menunjukkan penurunan nilai titik leleh (Tm) dengan penambahan BNT, dan dengan rentang suhu pelelehan yang lebih kecil. Kristalisasi PVDF terjadi secara isothermal dan adanya BNT menghasilkan titik kristalisasi (Tc) pada suhu yang lebih tinggi dibandingkan membran PVDF murni. Analisis termal dengan DSC memberikan informasi komprehensif pelelehan dan kristalisasi dari polimorf PVDF pada matriks membran.</p><p id="docs-internal-guid-c92edf53-7fff-cf03-76f3-f207f37c74f5" style="line-height: 1.2; text-align: justify; margin-top: 6pt; margin-bottom: 6pt;" dir="ltr"><strong>Effect of Bentonite toward Polymorph Phase Formation and Thermal Properties of Polyvinylidene Fluoride/Bentonite Hybrid Membranes. </strong>The study of the structure and thermal properties of PVDF/bentonite (BNT) hybrid membranes has been carried out. This study aims to determine the effect of BNT addition on the phase formation and thermal properties of the PVDF. In this study, PVDF/BNT hybrid membranes were prepared through the phase inversion method. The resulting membrane was characterized by Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR), x-ray diffraction (XRD), and differential scanning calorimetry (DSC). The results showed that the PVDF/BNT membrane has a PVDF polymorph structure with α and β phases confirmed by FTIR and XRD data. The DSC data showed that the addition of BNT decrease of the melting point (Tm) and with a smaller melting temperature range. PVDF polymorph crystallization occurs isothermally and the presence of BNT produces a crystallization point (Tc) at a higher temperature than pristine PVDF membrane. Thermal analysis with DSC provides comprehensive information on melting and crystallization of PVDF polymorphs in the membrane matrix.</p>
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ROSSI, Davide y Renata URUCI. "A multidisciplinary approach for the physic-chemical characterization of peloids to new perspectives in the development for “hydrothermal Developing Countries” using partecipatory methodology". Balneo and PRM Research Journal 12, n.º 3 (1 de septiembre de 2021): 227–32. http://dx.doi.org/10.12680/balneo.2021.442.
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The Osservatorio Termale Permanente (OTP) operated from 1996 to 2014 in the Italian and international therapeutic thermalism field. The main aim of OTP was the development of a multidisciplinary approach for the characterization of the quality of peloids for cutaneous application and their maturation process using different qualitative and quantitative analytic techniques opening at the Integrated Analytical Approach in the field of therapeutic thermalism. The main innovation introduced by OTP were rheology and surface tensiometry applications on peloids. The introduction of surface tensiometry included the skin as a fundamental element for the development of mud therapy protocols based on the bioadhesive properties of peloids. The interfacial investigations between peloids and skin led to the characterization of the exchange activity occurring during pelotherapy on the cutaneous surface in a non-invasive and fast way. On these bases, our work linked each other the multidisciplinarity approach to the study of hydrothermal resources performed by OTP with the concept of the participative methodology commonly applied to the development of projects in the field of development cooperation. This combined approach led us to develop a scientific proposal for the development of therapeutic thermalism in countries not yet improved in this field and characterized by the presence of hydrothermal resources. Keywords: peloid, surface tensiometry, Rossi factor, rheology, Rheological Termal Mud, skin, integrated analytical approach, participative methodology, therapeutical thermal proposal, hydrothermal development countries
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İLTER, Zülfiye y Gülşen EROL. "Investigation of Thermal Electrical and Biological Properties of of Acetyl Benzofurane Methacrylate Blends". Afyon Kocatepe University Journal of Sciences and Engineering 16, n.º 1 (10 de marzo de 2016): 32–40. http://dx.doi.org/10.5578/fmbd.14919.
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García, Alvaro, Jose Norambuena-Contreras, Moises Bueno y Manfred N. Partl. "Influence of Steel Wool Fibers on the Mechanical, Termal, and Healing Properties of Dense Asphalt Concrete". Journal of Testing and Evaluation 42, n.º 5 (1 de julio de 2014): 20130197. http://dx.doi.org/10.1520/jte20130197.
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Dəyyan oğlu Abbasov, Əliəddin, Fizzə Sadıx qızı Məmmədova, Gültəkin Sədrəddin qızı Hacıyeva y İlahə Mirhəsən qızı Seyidova. "Hydrochemical characteristics and usage perspectives of groundwater in the territory of Nakhchivan Autonomous Republic". NATURE AND SCIENCE 21, n.º 6 (17 de junio de 2022): 42–49. http://dx.doi.org/10.36719/2707-1146/21/42-49.
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Məqalədə muxtar respublika ərazisindəki yeraltı suların mənşəyi, formalaşması, yayılma qanunauyğunluqları, hidrokimyəvi xüsusiyyətləri və regional qiymətləndirilməsi nəzərdən keçirilir. Hazırda ayrı-ayrı çaylar, göllər, kəhriz, mineral və termal su mənbələri xüsusi mühafizə olunan təbii ərazilər statusuna malik obyektlər hesab edilir. Bu baxımdan, yerüstü su mənbələrinin azlıq təşkil etdiyi ərazilərdə yeraltı suların öyrənilməsi, onların hidrokimyəvi özəllikləri və istifadə perspektivlərini göstərməklə regionun yeraltı sularının (bulaq, çeşmə, kəhriz, mineral və termal, artezian suları) çağdaş vəziyyətlərinin ümumi su balansında və su təchizatında rolu müqayisəli təhlil edilir. Açar sözlər: yeraltı sular, hidrokimyəvi xüsusiyyətlər, minerallıq, makroelementlər, Kurlov formulu Alieddin Deyyan Abbasov Fizza Sadikh Mammadova Gultekin Sadraddin Hajiyeva Ilaha Mirhasan Seyidova Hydrochemical characteristics and usage perspectives of groundwater in the territory of Nakhchivan Autonomous Republic Abstract The article examines the origin, formation, distribution patterns, hydrochemical characteristics and regional assessment of groundwater in the territory of the autonomous republic. At present, individual rivers, lakes, kahriz, mineral and thermal water sources are considered objects with the status of specially protected natural areas. In this regard, the study of groundwater in areas where surface water sources are a minority, their hydrochemical characteristics and prospects of use, and the role of contemporary conditions of the region's groundwater (springs, springs, springs, mineral and thermal, artesian waters) in the general water balance and water supply are comparatively analyzed. Keywords: groundwater, hydrochemical properties, minerality, macroelements, Kurlov's formula
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Anggrainy, Rani, Riza Wirawan y Siska Titik Dwiyati. "Pengaruh Konsentrasi NaOH terhadap Sifat Termal Komposit Eceng Gondok dan Carbon Nanotube (CNT) dalam Matriks HDPE". Jurnal Permadi: Perancangan, Manufaktur, Material dan Energi 3, n.º 1 (29 de enero de 2021): 1–11. http://dx.doi.org/10.52005/permadi.v3i1.43.
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This study aims to determine the effect of alkali concentration on the thermal properties of HDPE composites with water hyacinth and carbon nanotubes (CNTs). The method used in this study is the experimental method. Composites made of natural fiber filler, the alkali treated water hyacinth. The water hyacinth was also filled was treated in alkali solution at various concentration (0%, 2%, 4%, 6%, and 8%). In addition to using water hyacinth fiber, the carbon nanotube (CNT) in a matrix of high-density polyethylene (HDPE). The composites were made using Rheomix OS machine. Furthermore, thermal testing of composite specimens using machine Thermogravimetric Analysis (TGA) were conducted. The results obtained from testing the thermal properties is the thermal resistance value. Thermal resistance of composites with alkali treatment of 0%, 2%, 4%, 6%, and 8% were 258,9 0C, 259,5 0C, 260,3 0C, 264,0 0C, and 265,9 0C, respectly. Based on these results it can be concluded that the concentration of NaOH improves the thermal resistance of the composite.
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Widiarti, Leni, Basuki Wirjosentono y Eddyanto Eddyanto. "ANALISIS SIFAT TERMAL DAN UJI KELARUTAN DARI KARET ALAM SIKLIS DAN KARET ALAM CAIR SIKLIS". JURNAL KIMIA MULAWARMAN 16, n.º 1 (29 de noviembre de 2018): 36. http://dx.doi.org/10.30872/jkm.v16i1.481.
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Abstract. The research has done analysis of thermal properties and solubility test of Cyclic Natural Rubber (CNR) and Cyclic Liquid Natural Rubber (CLNR). Cyclic Liquid Natural Rubber (CLNR) is a cyclical natural rubber which has decreased molecular weight. Synthesis of Cyclic Liquid Natural Rubber (CLNR) do by oxidative degradation after cyclic. Oxidative degradation after cyclic using Cyclic Natural Rubber (CNR) and phenylhydrazine reagent with flow rate 2 LMin-1 of oxygen atmosphere during 24 hours. Thermal analysis of Cyclic Natural Rubber (CNR) and Cyclic Liquid Natural Rubber (CLNR) by Differential Scanning Calorimetry (DSC),the glass transition temperature (Tg) of Cyclic Natural Rubber (CNR) and Cyclic Liquid Natural Rubber (CLNR) are 102,82 o C and 103,67 o C, the crystal transition temperature (Tc) of Cyclic Natural Rubber (CNR) and Cyclic Liquid Natural Rubber (CLNR) are 362,45 o C and 330,29 o C and the melting transition temperature ( Tm) of Cyclic Natural Rubber (CNR) and Cyclic Liquid Natural Rubber (CLNR) are 509,24 o C and 440,00 o C. Solubility test by dilute Cyclic Natural Rubber (CNR) and Cyclic Liquid Natural Rubber (CLNR) in some solvent with different properties and polarity index. Solubility test shows the results Cyclic Natural Rubber (CNR) and Cyclic Liquid Natural Rubber (CLNR) has polarity index around 2,4 – 4,4 and 2,4 and 4,4.
Keywords: CLNR, CNR, oxidative degradation
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Alfred D.D., P. Jhon, I. Gusti Ngurah Antaryama y Sri Nastiti N.E. "KINERJA TERMAL RUMAH NIANG DI DATARAN TINGGI TROPIS LEMBAB DI DISTRIK MANGGARAI". ATRIUM Jurnal Arsitektur 2, n.º 1 (7 de junio de 2020): 43–54. http://dx.doi.org/10.21460/atrium.v2i1.52.
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Title: The Performance of Niang House in the Tropical Highland of Manggarai District
Niang home is one of the ten varieties of Traditional Architecture in East Nusa Tenggara Province located in the highlands of Manggarai district (800 - 1200 meters above sea level) with its peculiarities, namely the circular floor plan and a conical roof. Niang home is growth by people with all kinds of traditions and utilize a variety of local potentials such as materials, technology and knowledge. But local potentials such as the use of lightweight materials such problems occur in upland areas that tend to be cold because the thermal properties of lightweight material is loose and flowing out so that it can potentially create underheating and conditions affecting comfort conditions in buildings. This study aimed to evaluate the effect of house design of Niang in response to thermal conditions in the highlands and analyze the behaviour of the material of the design elements that affect the thermal performance of the house of Niang. The study was conducted by the method of observation and simulation with the help of software ARCHIPAK version 5.0. The final results of this study indicate that the design of Niang house can not provide adequate thermal comfort, especially at night until morning, where the condition of the buildings tend to underheating in considerable period of time. From the simulation can also be seen that the floor and the roof is the most critical element of the heat release.
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Budisantoso, Edi Trijono y Syarip Syarip. "ANALISIS RANCANGAN DASAR SISTEM PGNAA MENGGUNAKAN SUMBER NEUTRON DARI BEAMPORT REAKTOR KARTINI". Jurnal Sains dan Teknologi Nuklir Indonesia 18, n.º 1 (7 de marzo de 2017): 1. http://dx.doi.org/10.17146/jstni.2017.18.1.2723.
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ABSTRAK ANALISIS RANCANGAN DASAR SISTEM PGNAA MENGGUNAKAN SUMBER NEUTRON DARI BEAMPORT REAKTOR KARTINI. Telah dilakukan perancangan dasar sistem PGNAA menggunakan salahsatu beamport reaktor Kartini sebagai sumber neutron. Moderator neutron ditempatkan pada ujung kolom berkas neutron untuk membuat berkas neutron menjadi termal. Berkas diarahkan menuju ruang sampel PGNAA dengan menggunakan kolimator yang berfungsi sebagai penyaring berkas neutron sejajar. Pada penggal kolimator yang berpotongan dengan jendela beamport dipasang neutron beam shutter untuk menutup berkas neutron apabila tidak digunakan untuk PGNAA. Beam stopper dipasang dibelakang ruang sampel PGNAA untuk menangkap berkas neutron yang lolos. Perhitungan sifat neutronik dilakukan untuk memilih bahan material yang memenuhi syarat fungsi sebagai sub-komponen PGNAA dan menentukan ukuran geometrinya. Dari hasil perhitungan diperoleh data bahan yang baik untuk moderator yaitu grafit, bahan kolimator adalah aluminium, bahan beam shutter dan beam stopper adalah komposit boraks-parafin. Panjang moderator 90 cm, panjang kolimator 173 cm dengan tetapan kolimasi D/L=0,015, tebal beam shutter dan beam stopper masing-masing 22 cm dan 30 cm. Dipasang perisai gamma dan perisai neutron untuk menutup berkas neutron keluar dari sela dinding dalam beamport dan didnding luar kolimator. Bahan perisai tersebut dibuat dari komposit boraks parafin 25% berat dan timbal yang masing-masing panjangnya 50 cm dan 30 cm. Hasil analisis menunjukkan bahwa dari fluks neutron awal pada beamport bagian dalam sebesar 1,5.1012 n/cm2s dapat menghasilkan fluks neutron termal di ruang sampel PGNAA 1,76.108 n/cm2s dengan arus neutron termal 9,29.108 n/s. Nilai fluks neutron termal tersebut memenuhi persyaratan untuk suatu sistem PGNAA yaitu berada pada orde 106 s/d 108 n/cm2s. Kata Kunci : PGNAA, rancangan dasar, prompt-gamma, analisis aktivasi, neutron-termal, beamport reaktor ABSTRACT BASIC DESIGN ANALYSIS OF PGNAA SYSTEM USING NEUTRON SOURCE FROM BEAMPORT OF KARTINI REACTOR. A basic design of PGNAA system using one of reactor beamports of Kartini reactor as a neutron source have been carried out. Neutron moderator is placed at the inner end of beamport column to make thermal neutron beam. A neutron beam directed to PGNAA counting chamber by using collimator as a filter to make parallel neutron beam. At the midle of collimator intersect with beamport window, neutron beam shutter is mounted to close when not in use for PGNAA. Beam stopper mounted behind the sample chamber of PGNAA to capture neutron beam that passes from the sample chamber. Calculation of neutronic properties of materials was done to choose the material that meet the functional requirements of PGNAA and to determine the geometry size. Based on the calculational results obtained that good material for moderator is graphite, aluminum as beam collimator, and beam shutter or stopper is made from borax-paraffin composite. The moderator length is 90 cm and collimator length is 173 cm with collimation constant D / L = 0,015. Beam shutter and beam stopper thickness are 22 cm and 30 cm respectively. Gamma and neutron shield are added surrounding beam colimator to shield the radiation out from the pitch between collimator and beamport wall. The shield material made from composite of parrafin 25 w % borax, and lead with the length of 50 cm and 30 cm respectively. The analysis result shows that from the neutron flux of 1,5.1012 n/cm2s at the inner side of beamport, can generate thermal neutron flux at the PGNAA sample chamber of 1,76.108 n/cm2s with the thermal neutron current of 9,29.108 n/s. This thermal neutron flux meet the requirement for a PGNAA system i.e. in the order of 106 to 108 n/cm2s. Keywords : PGNAA, basic design, prompt-gamma, activation analysis, thermal neutron, reactor beamport
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Saputri, Dini Deviana y Teguh Endah Saraswati. "Sintesis Carbon Nanotubes (CNT) Berbasis Bahan Alam Limbah Tempurung Kelapa dan Aplikasinya dalam Pembuatan Polimer Komposit Polimida-CNT: Review". Proceeding of Chemistry Conferences 6 (15 de septiembre de 2021): 38. http://dx.doi.org/10.20961/pcc.6.0.55088.38-46.
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<p><em>Carbon nanotubes</em> (CNT) menjadi salah satu material unggul teknologi nano yang membawa banyak keuntungan karena memiliki sifat kimia dan mekanik yang baik. Hal ini menjadikan CNT dimanfaatkan di berbagai aplikasi <em>nano-device </em>ataupun material komposit. Beberapa metode yang sering digunakan untuk menumbuhkan CNT adalah deposisi uap kimia (<em>Chemical Vapor Deposition</em>), laser ablasi dan <em>arc discharge</em>. Kebanyakan sumber prekursor karbon dalam sintesis CNT diambil dari bahan bakar fosil yang memiliki kelemahan bahan tidak bisa diperbaharui dan menghabiskan biaya yang mahal. Limbah bahan alam atau hasil biomassa dapat menjadi alternatif bahan baku pembuatan CNT yang membawa keunggulan biaya murah, ketersediaan melimpah, dan hemat energi, contohnya seperti limbah tempurung kelapa yang mengandung unsur karbon tinggi. Tempurung kelapa telah dilaporkan sebagai salah satu bahan baku potensial produksi CNT. Aplikasi CNT dalam polimer komposit contohnya penggabungan dengan polimida. Keunggulan polimida adalah sifat mekaniknya yang sangat baik, stabilitas termal, dan ketahanan kimia. Namun, polimida memiliki kelemahan dalam konduktivitas termal yang rendah. Penambahan CNT ke dalam polimida dapat meningkatkan konduktivitas termal sehingga meningkatkan kinerja polimer tersebut. </p><p><strong>Synthesis of Coconut-Shell Waste-based Carbon nanotubes (CNT) and Its Application in Polymer Composite Polyimide-CNT Fabrication: Review. </strong><em>Carbon nanotubes (CNTs) have become one of the excellent materials for nanotechnology which brings many advantages because of their good chemical and mechanical properties, inducing CNTs to be used in various nano-device applications or composite materials. Some of the methods commonly used to grow CNTs are chemical vapor deposition, laser ablation, and arc discharge. Most sources of carbon precursors in CNTs synthesis are taken from fossil fuels which have the disadvantages of non-renewable materials and high cost. Natural waste or biomass products can be an alternative raw material for CNTs production which brings the advantages of low cost, abundant availability, and energy-saving, for example, such as coconut shell waste which contains high carbon elements. Coconut shell has been reported as one of the potential raw materials for CNT production. CNT applications in composite polymers are for example collaboration with polyimides. The advantages of polyimides are their excellent mechanical properties and chemical resistance. However, polyimides have a disadvantage in their low thermal conductivity. The addition of CNT into polyimides can increase its thermal conductivity enhancing polyimide performance.</em></p><p align="center"> </p>
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Siswanto, Budiarto Djono, Bayu Fajar Saputro y Melya Dyanasari Sebayang. "Analisis Pengaruh Temperatur Terhadap Sifat Termal dan Gugus Fungsi Proses Thermoforming Material Polivinilklorida". JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY 5, n.º 2 (22 de diciembre de 2021): 134–50. http://dx.doi.org/10.31289/jmemme.v5i2.4816.
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Forming sheet plastic into various new shapes and applications, this plastic is adjusted to the design we want with the help of heat, pressure and molding. The purpose of this study was to determine the energy and heat value released by PVC material with variations in heating and cooling temperatures in the forming unit,to determine the effect of PVC process temperature on thermal properties with DSC tools and to determine the effect of PVC process temperature on functional groups using FTIR tools.The calculation results show that the heat released by the A.1 material is 1,740 Watt and A.2 is 1,938 Watt. The energy received by the cooling water in the 30th minute on specimen A.1 is 5.571 Watt and A.2 is 14,857 Watt with each temperature increase of 0.5℃. The results of the DSC test samples A.1 (defective) and A.2 (good) show that the melting temperature of the two is almost the same, which is around 78oC but there is a difference in Tg (temperature glass) of 0.013 J/goC faster than the A.2 test specimen 115oC (Very nice). The results of the FTIR test samples A.1 (disabled), A.2 (good) showed the highest difference in wavelength up to 8.4% at the wave values of 3749.77cm-1 and 3740.90cm-1.
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Temel, Sinan, Elif Yaman, Mehmet Fatih Gözükızıl y Fatma Özge Gökmen. "Mechanical, thermal and biodegradable behavior properties of nano SiO2 doped polyhydroxyethylmethacrylate (PHEMA) films". Food and Health 9, n.º 2 (2023): 117–28. http://dx.doi.org/10.3153/fh23011.
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In this study, nanocomposite materials were prepared by chemical modification of polyhydroxy ethyl methacrylate (PHEMA) and nano-SiO2. Scope of work; PHEMA-based nano-SiO2 doped nanocomposite hydrogels were produced by in-situ free radical polymerization technique with radical initiator and crosslinker. N,N,N′,N′-tetramethyl ethylenediamine (TEMED) was used as a catalyst. The interaction of the selected reinforcement material (SiO2) with the polymer (PHEMA) and the development of its structural properties for the application area are provided. The chemical structure, morphology, mechanical, thermal and biodegradable behavior of the obtained materials were investigated. It was observed that the nano reinforcement material doped on the films increased the mechanical strength, improved the biodegradable property and increased the thermal stability by 4 °C in the film with the highest amount of nano SiO2 addition.
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Liestiono, Ratih Puspita, Muhammad Sigit Cahyono, Wira Widyawidura, Agus Prasetya y Mochamad Syamsiro. "Karakteristik Minyak dan Gas Hasil Proses Dekomposisi Termal Plastik Jenis Low Density Polyethylene (LDPE)". Jurnal Offshore: Oil, Production Facilities and Renewable Energy 1, n.º 2 (19 de diciembre de 2017): 1. http://dx.doi.org/10.30588/jo.v1i2.288.
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<p>Penelitian ini bertujuan untuk mengetahui karakteristik minyak dan gas hasil proses dekomposisi termal (pirolisis) sampah plastik jenis l<em>ow density polyethylene</em> (LDPE) dengan berbagai variabel laju kenaikan suhu selama proses pirolisis terjadi. Pada proses ini digunakan reaktor pirolisis kapasitas 2 kg dengan laju kenaikan suhu sebesar 2, 4, dan 6 °C/menit sebagai variabel penelitian. Minyak dan gas yang terbentuk ditampung dalam wadah penampung dan diukur rendemennya. Karakteristik gas yang dihasilkan kemudian diuji di laboratorium menggunakan peralatan GC-MS dan peralatan uji sifat fisik khusus untuk minyak hasil pirolisis. Berdasarkan hasil penelitian, didapatkan bahwa semakin tinggi laju kenaikan suhu, minyak yang diahsilkan semakin banyak dan gas semakin sedikit. Rendemen minyak terbesar sebesar 35,83 % dihasilkan pada proses pirolisis dengan laju kenaikan suhu 6 °C/menit, dimana pada saat itu, nilai rendemen gas adalah paling kecil, sebesar 5,83 %. Sementara hasil identifikasi gas, yang paling dominan adalah gas jenis butena, dimana kadarnya semakin kecil seiring dengan laju kenaikan suhu. Kandungan gas butena terbesar sebesar 98% pada laju kenaikan suhu 2 °C/menit. Sementara berdasarkan uji sifat fisik, karakteristik minyak plastik mendekati sifat-sifat bahan bakar minyak, terutama kerosen., sehingga cukup layak apabila dijadikan sebagai bahan bakar alternatif pengganti BBM.</p><p><em>This study aims to determine the characteristics of oil and gas from the thermal decomposition (pyrolysis) process of waste </em><em>low density polyethylene (LDPE) type plastic with various temperature increase rate variables during the pyrolysis process. In this process a 2 kg capacity pyrolysis reactor is used with a temperature increase of 2, 4, and 6 °C/min as the research variable. The oil and gas that is formed is stored in a container and the yield is measured. The characteristics of the gases produced are then tested in the laboratory using GC-MS equipment and special physical property test equipment for pyrolysis oils. Based on the research results, it was found that the higher the rate of temperature rise, the more oil is produced and the less gas. The largest oil yield of 35.83 % was produced in the pyrolysis process with a rate of temperature rise of 6 °C/min, where at that time, the value of the gas yield was the smallest, amounted to 5.83 %. While the gas identification results, the most dominant is the type of butene gas, where the levels get smaller along with the rate of temperature rise. The biggest butene gas content is 98 % at a rate of temperature rise of 2 °C/min. While based on the physical properties test, the characteristics of plastic oil approach the properties of fuel oil, especially kerosene, so it is quite feasible if used as an alternative fuel to substitute fuel.</em></p>
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Coşkun, Mehmet Fatih, Adem Şentürk y Demet Coşkun. "Synthesis, Characterization of Chalcone Containing Methacrylate Polymers: Investigation of Fluorescence, Thermal and Dielectric Properties". Afyon Kocatepe University Journal of Sciences and Engineering 16, n.º 2 (1 de junio de 2016): 230–38. http://dx.doi.org/10.5578/fmbd.28131.
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KALKAN, Selin, Mustafa OTAĞ y Mehmet Soner ENGİN. "Characterization of functional properties of edible methylcellulose films containing Momordica charantia L. ethanolic extract". Karadeniz Fen Bilimleri Dergisi 13, n.º 4 (15 de diciembre de 2023): 1836–55. http://dx.doi.org/10.31466/kfbd.1363270.
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Bu çalışmada, Momordica charantia L. etanol ekstraktının (ME) farklı konsantrasyonları (% 0.25, 0.50, 0.75 ve 1) kullanılarak metilselüloz yenilebilir filmler (MC) üretilmiştir. MC filmlerin fizikokimyasal özellikleri ile antimikrobiyal (Bacillus cereus, Escherichia coli ATCC 25922, Staphylococcus aureus 6538 IP, Staphylococcus epidermis ATCC 1228, Vibrio parahemolyticus ATCC 17802, Yersinia pseudotuberculosis ATCC 911, Listeria monocytogenes, Enterococcus faecalis ATCC 29212, Salmonella Typhimurium ATCC 14028, Klebsiella pneumonia, Proteus vulgaris ATCC 13315'e karşı) ve antioksidan aktiviteleri açısından analizleri yapılmıştır. Fourier dönüşümlü kızılötesi (FTIR) spektroskopisi analizi, polimer ve ME arasındaki fonksiyonel grup etkileşimlerini belirlemede kullanılırken, termal gravimetrik analiz (TGA) ve diferansiyel taramalı kalorimetri analizi ise fizikokimyasal karakterizasyonu tanımlamada kullanılmıştır. Kontrol filmlere kıyasla, 24 saat sonunda en yüksek antimikrobiyal etki Proteus vulgaris'e karşı (yaklaşık 1.93 log KOB/mL) %1 ME içeren MC filmlerinde elde edilmiştir. ME konsantrasyonunun artması ile film mukavemeti arasında ters bir ilişki gözlemlenirken, su buharı geçirgenlik değerlerinde önemli bir azalma, temas açısı değerlerinde iyileşme ve hidrofilik özelliklerde belirgin bir artış tespit edilmiştir. Tüm bu sonuçların ışığında, MCME film örnekleri biyolojik olarak parçalanabilir özellikte ve yenilebilir gıda ambalajlama uygulamaları için uygun bileşenler olarak nitelendirilmiştir.
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Snigir, Alexandra N., Evgenij M. Savitsky, Valerij T. Saikin y Gennadij B. Petrov. "Control over the process of formation of the structure and properties of cast iron by termal analysis method". Thermochimica Acta 93 (septiembre de 1985): 657–60. http://dx.doi.org/10.1016/0040-6031(85)85165-0.
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Darmawan, Steven Mangihut, Steven Darmawan y Suroso Suroso. "EVALUASI DESAIN TERMAL KONDENSOR PLTN TIPE PWR MENGGUNAKAN PROGRAM SHELL AND TUBE HEAT EXCHANGER DESIGN". POROS 12, n.º 1 (1 de agosto de 2017): 10. http://dx.doi.org/10.24912/poros.v12i1.678.
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Abstract: The study was executed to get a quick calculation method for the design of equipment heat exchanger type shell and tube with a program shell and tube heat exchanger design. The purpose of this study was to obtain the results of the validation program shell and tube heat exchanger design of a condenser with power 4368.75 kW and the results of the evaluation program shell and tube heat exchanger design on the thermal design condensers nuclear power plant AP1000 PWR type. Input data into the program is done by inserting the parameters temperature, flow rate, physical properties and geometrical dimensions of the available designs of heat exchanger equipment specifications. Parameter for comparison of data can be obtained from the results of other calculations or experimental data. The results of comparison of the validation program shell and tube heat exchanger with condenser design calculations showed the highest difference found on Utube parameter equal to 1.3% lower than the design condition. This occurs because of differences in calculation between the program designed. The result evaluation of program shell and tube heat exchanger design toward the thermal design condensers nuclear power plant PWR type AP1000 obtained unknown parameters from the technical specifications.
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Sucahyo, Lilis. "PERFORMANCE ANALYSIS OF WORKING FLUIDS ON ORGANIC RANKIE CYCLE (ORC) MODEL WITH BIOMASS ENERGY AS A HEAT SOURCES". Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) 8, n.º 3 (30 de septiembre de 2019): 175. http://dx.doi.org/10.23960/jtep-l.v8i3.175-186.
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Organic Rankine Cycle (ORC) is an electricity power technology particularly suitable for medium-low temperature heat sources and/or for small available termal power. This paper presents the simulation and performance analysis of working fluids R-134a, R-414B, R-404A and R-407C on ORC with biomass energy as a heat source. Simulation of the ORC system using Cycle Tempo software. The property of working fluids is obtained by using Reference Fluid Properties (Refprop). The best result performance of ORC was shown by working fluid R-404A with thermal efficiency 7.54 % and electric power output ranges between 0.075 kW. This condition operated on turbine inlet temperature at 60 oC, difference turbine working temperature of 15 oC, condensing temperature 25 oC and water boiler mass flow rate 3 lpm.
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Subardi, Adi y Yen-Pei Fu. "Ekspansi Termal, Oxygen Content, dan Sifat Elektrokimia Oksida SmBa0.5Sr0.5Co2O5+δ (70%) + SDC (30%) Sebagai Katoda SOFC". Jurnal Riset Kimia 13, n.º 2 (30 de septiembre de 2022): 208–15. http://dx.doi.org/10.25077/jrk.v13i2.557.
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The thermal properties of the double perovskite SmBa0.5Sr0.5Co2O5+δ (70%) + SDC (30%) have been investigated as potential cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFC). This study also includes the oxygen content and electrochemical performance of long-term tests carried out to evaluate the electrochemical stability. Cathode powder is fabricated by a simple and relatively inexpensive solid-state reaction. Oxygen content decreased gradually from room temperature to 800oC by 18.3%. Doping 30% SDC into SBSC oxide can reduce the thermal expansion coefficients (TEC) value from 19.80 x 10-6 (K-1) to 18.17 x 10-6 (K-1) or a decrease of 8.23%. The activation energy (Ea) identified by the electrochemical impedance spectroscopy (EIS), low field (LF), and high field (HF) techniques were 125.3 kJ mol-1, 60.6 kJ mol-1, and 62.5 kJ mol-1, respectively. The SBSC73|SDC|SBSC73 symmetric cell test for 96 hours at 600oC showed an increase in the average polarization resistance value of 0.30% h-1. The cathode grains are evenly distributed with a size of 2-3 µm and tend to be porous. These results exhibit that SmBa0.5Sr0.5Co2O5+δ (70%) + SDC (30%) is a promising cathode material for IT-SOFCs.
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Başkaya Sezer, Duygu. "The effect of particle size on the composition and the hydration, oil holding, thermal, and technological properties of grape pomace". Food and Health 10, n.º 1 (2024): 52–63. http://dx.doi.org/10.3153/fh24005.
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Grape pomace is a by-product of the beverage industry. In this study, composition, hydration, oil holding, thermal, and some technological properties, in addition to the colour values of grape pomace with particles larger than 595 μm, 298-595 μm, 150-297 μm, 149-106 μm, 75-105 μm and smaller than 74 μm were found to be different. In the sample with particles larger than 595 μm, ash, crude fat, carbohydrate content, sediment volume fraction in water and oil, pH, thermal diffusivity, and colour lightness (L) were measured higher than in the other samples. The water holding capacity, absorption index, oil holding capacity, and swelling power in oil were the highest in samples with 150-297 µm particle size. Moisture, crude protein content, solubility index, swelling power in the water, bulk and packed density, water activity, brix, refractive index, thermal conductivity, specific heat, redness (a), yellowness (b) and colour difference (∆E) properties were determined to be the highest in samples with particle sizes smaller than 74 µm.
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AKTAŞ, Sitki y Fatih ÜNAL. "Investigation of Structural and Electrical Properties of Metal Oxide and Organic Based Multi Heterojunction". Karadeniz Fen Bilimleri Dergisi 12, n.º 1 (15 de junio de 2022): 508–20. http://dx.doi.org/10.31466/kfbd.1103586.
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Bu çalışmada, yarıiletken metal oksit ZnO bileşiği elektrokimyasal kaplama yöntemi kullanılarak cam/ITO üzerine büyütülmüştür. Daha sonra C24H12 organik yarıiletken katmanı termal buharlaştırma yöntemiyle cam/ITO/ZnO ekleminin üzerine kaplanmıştır ve cam/ITO/ZnO/C24H12 çoklu heteroeklemi üretilmiştir. Üretilen tabakaların yüzeysel analizi taramalı elektron mikroskobu ile yapılmış, ZnO tabakasının nanoflake ve nanoçubuk, C24H12 tabakasının nanotel şeklinde büyüdüğü görülmüştür. Ayrıca ZnO tabakasının elementel dağılımı Enerji dağılımlı X-ray spektroskopisi (EDS)üzü ile incelenmiş, Zn ve O elementlerinin tabaka içerisinde homojen bir dağılım sergiledikleri görülmüştür. ±1.5V uygulama potansiyeli aralığında karanlık ve 100mW/cm2 ışık şiddeti altında Ag/ITO/ZnO/C24H12/Ag çoklu heteroekleminin elektriksel özellikleri karakterize edilmiş. Karanlik ortamda, seri direnç (Rs), diyot idealite faktörü (n), engel yüksekliği (∅_b), ters doyma akımı (I0) sırasıyla ≈104Ω, 7.5-6.5, 0.647 eV ve 5,7E-7 A değerlerini almışken, 100mW/cm2 ışık şiddeti altında bu değerlerin sırasıyla ≈103Ω, 6.5-1.3, 0.914 eV ve 1.9E-11 A olduğu görülmüştür. Çoklu heteroeklemin fotoiletkenlik mekanizması için önemli parametreler olan fotoakım (Iph), fotoduyarlılık (R) ve fotohassasiyet (S) değerleri ileri besleme altında farklı voltaj değerlerinde belirlenmiştir. Ayrıca çoklu heteroeklemin fotovoltaik parametreleri hesaplanmış ve dolum faktörü FF’nin 0.56 olduğu görülmüştür. Tüm bu analizler sonucunda ürettiğimiz Ag/ITO/ZnO/C24H12/Ag çoklu heteroeklemin fotodiyot ve fotovoltaik davranış sergilediği görülmüştür.