ANALISA RUANG EVAPORASI PADA DESTILATOR DUA ATAP MIRING MEMANFAATKAN PANAS GAS BUANG MESIN DIESEL

Energi gas buang mesin kapal nelayan yang terbuang keudara bebas belum dimaanfaatkan, sehingga didesain alat destilasi air laut menjadi air tawar yang dapat digunakan nelayan. Tujuan penelitian ini adalah menghasilkan prototipe destilator memanfaatkan energi gas buang mesin Diesel, menghasilkan air tawar untuk kebutuhan nelayan, meningkatkan produktivitas nelayan saat berlayar dapat mengolah air laut menjadi air tawar dan mengetahui produk uap dan air tawar pada ruang evaporasi destilator tipe dua atap miring. Penelitian ini menggunakan metode eksperimen. Destilator didesain sebagai alat destilasi air laut dengan memanfaatkan energi gas buang mesin Diesel. Menganalisa produksi uap air dan produk air tawar pada ruang evaporasi. Hasil penelitian selama 3 jam dengan volume air laut 25 liter diperoleh : Pada putaran mesin 2200 rpm, produk air tawar 4,07 kg, produk uap 4,24 kg, temperatur gas buang 228 oC, temperatur air laut 89 oC, kalor sensibel maksimum 1,609 kJ/s, kalor laten maksimum 1,276 kJ/s dan kalor kondensasi maksimum 1,356 kJ/s. Pada putaran 2000 rpm, produk air tawar 3,34 kg, produk uap 4,075 kg, temperatur gas buang 209 oC, temperatur air laut 87 oC, kalor sensibel maksimum 1,727 kJ/s, kalor laten maksimum 1,14 kJ/s dan kalor kondensasi maksimum 1,12 kJ/s. Pada putaran 1800 rpm, produk air tawar 2,62 kg, produk uap 3,001 kg, temperatur gas buang 185 oC, temperatur air laut 83 oC, kalor sensibel maksimum 1,551 kJ/s, kalor laten maksimum 0,903 kJ/s dan kalor kondensasi maksimum 0,911 kJ/

Desain Destilator Dua Atap Miring dengan Memanfaatkan Panas Gas Buang Mesin Diesel

The general objective of this research is to generate destilator prototype that utilize heat exhaust gas from engine fishing boats, while specific objective of this research is to generate usefull technology, to generate fresh water for the needs on fishing boats, to increase the productivity of fisherman through the efficiency of sailling time while processing sea water to be fresh water on fishing boat. This research uses experimental method. Destilator was designed as destillation tool of sea water with utilizing heat from exhaust gases of diesel machine. The result of the research for three hours with the volume of distilled water 25 liters were obtained; on machine circle 2200 rpm fresh water generated is 4465 ml with the temperature of sea water 89 oc effectiveness of destilator 66.06 % with heat loses 0.1891kj/s; on machine circle 2000 rpm of fresh water generated is 3700 ml with the temperature of sea water 87 oc, effectiveness of destilator 65.79 % with heat loses 0.068 kj/s; on machine circle 1800 rpm of fresh water generated is 2940 ml with the temperature of sea water 83 oc effectiveness of of destilator 64.36 % with heat loses 0.0313kj/s

Diffusion doping of cobalt in rod-shape anatase TiO\u3csub\u3e2\u3c/sub\u3e nanocrystals leads to antiferromagnetism†

Cobalt(II) ions were adsorbed to the surface of rod-shape anatase TiO2 nanocrystals and subsequently heated to promote ion diffusion into the nanocrystal. After removal of any remaining surface bound cobalt, a sample consisting of strictly cobalt-doped TiO2 was obtained and characterized with powder Xray diffraction, transmission electron microscopy, UV-visible spectroscopy, fluorescence spectroscopy, X-ray photoelectron spectroscopy, SQUID magnetometry, and inductively-coupled plasma atomic emission spectroscopy. The nanocrystal morphology was unchanged in the process and no new crystal phases were detected. The concentration of cobalt in the doped samples linearly correlates with the initial loading of cobalt(II) ions on the nanocrystal surface. Thin films of the cobalt doped TiO2 nanocrystals were prepared on indium-tin oxide coated glass substrate, and the electrical conductivity increased with the concentration of doped cobalt. Magnetic measurements of the cobalt-doped TiO2 nanocrystals reveal paramagnetic behavior at room temperature, and antiferromagnetic interactions between Co ions at low temperatures. Antiferromagnetism is atypical for cobalt-doped TiO2 nanocrystals, and is proposed to arise from interstitial doping that may be favored by the diffusional doping mechanism

Oxygen Reduction Reaction with Manganese Oxide Nanospheres in Microbial Fuel Cells

Operating microbial fuel cells (MFCs) under extreme pH conditions offers a substantial benefit. Acidic conditions suppress the growth of undesirable methanogens and increase redox potential for oxygen reduction reactions (ORRs), and alkaline conditions increase the electrocatalytic activity. However, operating any fuel cells, including MFCs, is difficult under such extreme pH conditions. Here, we demonstrate a pH-universal ORR ink based on hollow nanospheres of manganese oxide (h-Mn3O4) anchored with multiwalled carbon nanotubes (MWCNTs) on planar and porous forms of carbon electrodes in MFCs (pH = 3–11). Nanospheres of h-Mn3O4 (diameter ∼ 31 nm, shell thickness ∼ 7 nm) on a glassy carbon electrode yielded a highly reproducible ORR activity at pH 3 and 10, based on rotating disk electrode (RDE) tests. A phenomenal ORR performance and long-term stability (∼106 days) of the ink were also observed with four different porous cathodes (carbon cloth, carbon nanofoam paper, reticulated vitreous carbon, and graphite felt) in MFCs. The ink reduced the charge transfer resistance (Rct) to the ORR by 100-fold and 45-fold under the alkaline and acidic conditions, respectively. The current study promotes ORR activity and subsequently the MFC operations under a wide range of pH conditions, including acidic and basic conditions

A Review on "OWNING UP: The 14 Questions Every Board Member Needs to Ask"

Ram Charan, the author of the book is a highly sought-after advisor to corporate, board, CEOs, and senior executives in companies ranging from start-ups to the fortune 500, including GE, DuPont, and Colgate-Palmolive. He also has an inside perspective as a board member for Tyco, Austin Industries, and diversified Indian corporations. The contemporary view of the author towards solving the business problems is very innovative. This book talks about 14 questions which every board member has to ask to himself for running a business effectively and efficiently

ANALISA PENGARUH KEAUSAN KATUP TERHADAP UNJUK KERJA MOTOR DIESEL TYPE COLT 100 PS

Penelitian ini bertujuan untuk menganalisa perubahan parameter-parameter yang disebabkan terjadinya keausan pada katup mesin diesel type colt 100 PS. Keausan katup dapat disebabkan oleh penggunaan air pendingin yang kualitasnya tidak sesuai standar sehingga menimbulkan endapan kapur pada ruang pendingin. Endapan kapur menyebabkan mengecilnya ruang pendingin sehingga akan menimbulkan panas yang berlebihan pada kepala silinder. Perubahan parameter-parameter pada siklus termodinamika motor akan mempengaruhi unjuk kerja suatu motor. Pada penelitian ini parameter-parameter termodinamika motor mengalami penurunan sehingga menurunkan daya indikator maupun daya efekti

Pengaruh Variasi Massa Air Laut terhadap Efektifitas Destilator dengan Memanfaatkan Panas Gas Buang Mesin

Penelitian ini bertujuan untuk mengetahui pengaruh variasi volume air yang didestilasi terhadap efektifitas destilator serta jumlah air tawar yang dihasilkan dengan memanfaatkan panas gas buang. Penelitian ini menggunakan metode eksperimen. Destilator didesain sebagai alat destilasi air laut dengan memanfaatkan panas gas buang mesin Diesel. Pembuatan dan pengujian destilator sebagai alat uji dilaksanakan di Worskhop center Universitas Hasanuddin kota Makassar. Hasil penelitian selama 3 jam dengan putaran mesin yang konstan 2400 rpm diperoleh : untuk volume yang didestilasi 20 liter efektifitas alat 74 % , produksi air tawar 4,307 liter atau 1,436 liter/jam, volume 25 liter efektifitas alat 70,02 %, produksi air tawar 3,842 liter atau 1,28 liter/jam dan volume 30 liter efektifitas alat 66,14 %, produksi air tawar 3,359 liter atau 1,12 liter/jam