Perancangan Alat dan Pengujian Tegangan Tembus dengan Minyak Isolasi RBDPO Olein Menggunakan Elektroda Bola-Bola

The crude oil based transformer insulation has several issues i.e. non-environment friendly, non-biodegradable, non-reneweble, and rarely. Vegetable oil is an alternative transformer insulation which is Crude Palm Oil based RBDPO Olein. This paper proposes study to investigate characteristic the AC breakdown voltage referring to IEC 60156-95 standard to apply sphere electrode of RBDPO Olein prior water content reduction, post water content reduction, and converting fatty acids into Methyl Ester. Breakdown voltage also look into the effect of gap electrode and affectivity of sphere electrode scheme. The experiment has shown the breakdown voltage have increased significantly after various samples of RBDPO Olein being reduction the water content, has compered to IEC 156 standard with the value of (30 kV/2.5 mm). The gap of electrode has shown a significant value on breakdown voltage measurement result. In the mean time to measure the effectivity breakdown voltage of sphere electrode scheme, the Mineral Oil is deployed with complied to IEC 156 standard. The measurement result shows lower then IEC 60156-95 standard was 68,73 %. The experiment also shown the density measurement, the viscosity measurement, the dissolved gas analysis measurement, and dielectric dissipation factor measurement achieve RBDPO Olein less water concentration

Karakteristik Tegangan Tembus Dielektrik Isolasi Vakum

The sulfur hexafluorida (SF6) is the best insulators for high voltage. However, SF6 has a very serious problem for the environment that this gas has make a big contribution for global warming. Of course, the study of other insulators is necessary to get the efficient insulation than SF6. Required alternative insulation gases such as carbon dioxide (CO2), nitrogen (N2) or vacuum insulation. From experiment testing with needle electrodes and sphere electrodes for vacuum pressure on -100 mmHg, -150 mmHg, -250 mmHg and -500 mmHg, respectively show the breakdown voltage is lowest than to the air pressure insulation. Then, the data from the study also found that the vacuum breakdown voltage is smaller than air. The use of linear method can show the vacuum breakdown voltage is inversely proportional to the air. But vacuum breakdown voltage is directly proportional to the distance between the needle electrode or sphere electrode

Molecular Docking on Azepine Derivatives as Potential Inhibitors for H1N1-A Computational Approach

Azepine are an important class of organic compounds. They are effective in a wide range of biological activity such as antifeedants, antidepressants, CNS stimulants, calcium channel blocker, antimicrobial and antifungal properties. In our continue efforts to search for a potent inhibitor for H1N1 virus using molecular docking. In this study, 15 azepine (ligands) derivatives were docked to the neuraminidase of A/Breving Mission/1/1918 H1N1 strain in complex with zanamivir (protein). The Cdocker energy was then calculated for these complexes (protein-ligand). Based on the calculation, the lowest Cdocker interaction energy was selected and potential inhibitors can be identified. Compounds MA4, MA7, MA8, MA10, MA11 and MA12 with promising Cdocker energy was expected to be very effective against the neuraminidase H1N1

Cross-Reactivity of Filariais ICT Cards in Areas of Contrasting Endemicity of Loa loa and Mansonella perstans in Cameroon: Implications for Shrinking of the Lymphatic Filariasis Map in the Central African Region

Background Immunochromatographic card test (ICT) is a tool to map the distribution of Wuchereria bancrofti. In areas highly endemic for loaisis in DRC and Cameroon, a relationship has been envisaged between high L. loa microfilaria (Mf) loads and ICT positivity. However, similar associations have not been demonstrated from other areas with contrasting levels of L. loa endemicity. This study investigated the cross-reactivity of ICT when mapping lymphatic filariasis (LF) in areas with contrasting endemicity levels of loiasis and mansonellosis in Cameroon

Update on the distribution of Mansonella perstans in the southern part of Cameroon: influence of ecological factors and mass drug administration with ivermectin

Overview of gender distribution and median age in study sites. Out of 14,293 (6,746 males and 7,547 females) individuals involved in the study, 52.8 % were females. (PDF 224 kb

Marginalization of end-use technologies in energy innovation for climate protection

Mitigating climate change requires directed innovation efforts to develop and deploy energy technologies. Innovation activities are directed towards the outcome of climate protection by public institutions, policies and resources that in turn shape market behaviour. We analyse diverse indicators of activity throughout the innovation system to assess these efforts. We find efficient end-use technologies contribute large potential emission reductions and provide higher social returns on investment than energy-supply technologies. Yet public institutions, policies and financial resources pervasively privilege energy-supply technologies. Directed innovation efforts are strikingly misaligned with the needs of an emissions-constrained world. Significantly greater effort is needed to develop the full potential of efficient end-use technologies