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Showing 1 to 20 of 217 for “"KOH"”.
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The Koh verbal system
… introduction: "The purpose is to describe the Koh verbal system in terms of its grammatical forms and their possible meanings. Special attention is given to the tense-aspect-mood (TAM) system. The formally marked categories of the TAM system are relatively few in Koh. In fact Koh is a …
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Koh etching of silicon
… have been carried out using potassium hydroxide (KOH) for different experimental etching conditions for concentration, temperature and time on (100) orientation p-type silicon wafers. Besides the basic etching conditions, the position of the immersed wafer also has unpredictable effect on the …
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Island Tourism and Sustainable Development in Thailand, Case Study of Koh Pha-Ngan
… of current tourism situation on the island of Koh Pha-ngan, Thailand. It categorises opportunities for, and constraints to, sustainable tourism development on the island, along with identifying the main variables of tourism sustainability relevant to island situations. Data from key …
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Enhanced Fabrication of Microdroplet Generator Nozzle Arrays: Optimizing KOH Etching for Microfluidic Applications
… nozzles using a basic potassium hydroxide (KOH) solution. Given the integral role of nozzle geometry in device operation, high-precision techniques including Reactive Ion Etching (RIE), Deep Reactive Ion Etching (DRIE), and KOH wet etching were employed. A tapering geometry is preferred for …
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Investigation of new KOH and NaOH thermochemical cycles for hydrogen production and carbon capturing
… and investigates four new versions of NaOH and KOH thermochemical cycles to combine hydrogen production and carbon dioxide removal in an integrated and synergistic manner. The sodium hydroxide and potassium hydroxide thermochemical cycles are considered as the base cycles to produce hydrogen by …
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Sulphur Chemistry in KOH-SO2 Activation of Fluid Coke and Mercury Adsorption from Aqueous Solutions
… by chemical activation was investigated. Using KOH and SO2, the activation process was able to produce SIACs with controllable specific surface area (SBET), pore size distribution and sulphur content. The highest SBET was over 2500 m2/g and the highest sulphur content was 8.1 wt%. K-edge X-ray …
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Socio-cultural changes in Thai beach resorts: a case study of Koh Samui Island, Thailand.
… associated behavioural changes in their society. Koh Samui was chosen for this investigation as it is a self-contained model of a beach resort development where there are sociocultural impacts. A constructivist paradigm approach was adopted. Consideration is given in the literature review and the …
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Prediction of going-concern status: a probit model for the auditors
… prediction model (hereafter called the Koh model) that is based upon improved statistical techniques and methodology. A sample of 165 companies that filed for bankruptcy during the period 1980 to 1985 and a matched sample of 165 non-bankrupt companies are used to construct and test the …
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Digestibility of Sunflower Hulls Treated with Sodium, Ammonium, and Potassium Hydroxides
… (NH<sub>4</sub>OH), and potassium hydroxide (KOH) at increasing levels were studied. Tested concentrations of each alkali as percent dry matter (DM) on SFH were 1.63, 2.45, 3.26, and 4. 08. In vitro dry matter digestibility of sunflower hulls increased with higher concentrations of NaOH and …
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Use of Biochar to Produce Reclaimed Water for Irrigation Reuse Purposes
… Chemical activation of native biochar using 1N KOH was performed to obtain KOH-biochar. Initially, total organic carbon (TOC) was used as a surrogate for CECs present in water, and native as well as KOH-biochar were used to remove TOC from treated wastewater. Prior to TOC removal experiments, DI …
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Bioprospek nyamplung (Callophyllum inophyllum L.) dan kapuk randu (Ceiba pentandra Gaetn) sebagai bahan baku biodiesel
… untuk angka keasaman nyamplung 1,234 mg KOH/g, angka iodium 9,078, dan angka penyabunan 217, sedangkan untuk kapuk randu memiliki angka keasaman 0,895 mg KOH/g, angka iodium 9,122 g I/g, dan angka penyabunan 231, 481 mg KOH/g. Sedangkan standart tentatif bahan baku biodiesel Indonesia …
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Spektrofluorimetrische Selenbestimmung in biologischen Proben : Entwicklung und Validierung der Methode
… In dieser Arbeit wurde die erstmals von Koh und Benson [56] beschriebene spektrofluorimetrische Methode zur Selenbestimmung so modifiziert und optimiert, dass eine für die klinische Selenbestimmung biologischer Proben geeignete, genaue Methode resultierte. Das zur Bestimmung eingesetzte …
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Understanding and Controlling Failure Mechanisms of the Zinc Anode for Rechargeable Alkaline Batteries
… cells in 37 wt% potassium hydroxide (KOH) electrolyte wherein the percent utilization of the theoretical capacity of the Zn electroactive material is systematically varied between 1% and 16%. Cell fabrication is kept typical to the prevailing industrial cell design. Cycle life ranges …
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Der Einfluß lokaler Fluoridierungsmaßnahmen auf die Fluoridaufnahme, Retention und die Mineralisation kariöser Initialläsionen in vitro
… der Untersuchung war es, die in-vitro-Retention KOH-löslichen und fest gebundenen Fluorids sowie die Reduktion des Mineralverlusts und der Läsionstiefe in demineralisiertem Schmelz nach einmaliger Applikation einer hoch konzentrierten Fluoridlösung und zweiwöchiger Applikation einer geringer …
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The Traditional Roles of Caring for Elders: Views from First Nations Elders Regarding Health, Violence, and Elder Abuse
… views of Carrier Sekani Elders in the Ts'il Kaz Koh community. The design acted to support the aims of the study which were: To explore how First Nations Elders understand violence in their communities, to explore what First Nations Elders believe gives rise to violence in First Nations …
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Development and experimental investigation of direct urea fuel cells
… performance is achieved at 65°C with 9 M KOH and 0.5 M urea, yielding a peak power density of 46.38 mW/cm². The stack shows improved performance at 65°C, with a power output of 0.307 kW. The single cell attains an open circuit voltage (OCV) of 0.72 V, while the stack reaches 8.8 V. The …
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Der Einfluss von Speichel auf die Ausbildung einer CaF2-Schicht auf den Zahnschmelz nach Verwendung unterschiedlicher fluoridhaltiger Zahnpasten
… diente die Aufnahme von lose gebundenem Fluorid (KOH-lösliches Fluorid). <br>Für diese Untersuchung wurden aus 140 Rinderzähnen 320 Schmelzproben hergestellt. Die Schmelzzylinder mit einem Durchmesser von 6mm wurden unter Aussparung der Oberfläche nach Einbettung in Technovit an der Ober und …
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Characterization of chemically fixed nitrogen-15-labeled liquid anhydrous ammonia and of biologically immobilized nitrogen-15 in typical Illinois mollisols
… with 0.15 M Na$\sb4$P$\sb2$O$\sb7$ and 0.15 M KOH, and the extracted N was fractionated into humic acid (HA) and fulvic acid (FA). The residual soil was then extracted with 0.1 M NaOH and 99% (v/v) dimethyl sulfoxide (DMSO). The FA fraction was further separated into low molecular weight (LMW) …
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A Study on the Nature of Anomalous Current Conduction in Gallium Nitride
… characteristics is presented in molten KOH etching, as evidenced by CAFM measurements, Schottky diodes, and MODFET's. The aim of this study is to identify anomalous conduction mechanisms, the likely cause of anomalous conduction, and a method for improving the conduction characteristics. …
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Investigating the Effect of Electrolyte Concentration and Charging Protocol on Materials Utilization in Rechargeable Zinc Manganese Dioxide Batteries
… (DOD), of 100%, 50% and 30%. As well, the KOH electrolyte concentration is varied to 37, 25, and 10 wt. %, to investigate concentration effects. Based on the findings, we propose that one major cause for loss of capacity on cycling of MnO<sub>2</sub> cathodes stems from the solubility of …
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