147 results for “pressure increase”

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Research ArticleOpen accessAll words, across the recordImprovement of Biohydrogen Production under Increased the Reactor Size by C. acetobutylicum NCIMB 13357Hisham Salem Alshiyab, Mohd Sahaid Kalil, Aidil Abdul Hamid, Wan Mohtar Wan YusoffProblem statement: One of the main factors influenced the bacterial productivity and total yield of hydrogen is the partial pressure of produced gas. A novel solution to enhance the bacterial productivity was through reduction of gas pressure. Approach: Increasing the reactor size showed to enhance the bacterial production of hydrogen. Results: The technique of increasing reactor size resulted to enhance … …American Journal of Environmental Sciences, Vol. 5, Issue 1 · 28 Feb 2009 · 7,361 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordMolecular Dynamics Investigation of Cutting Force in Nanometric Cutting of Monocrystalline SiliconY.H. Chen, F.Z. Fang, X.D. Zhang, X.T. HuProblem statement: Ultra-precision machining of monocrystalline silicon has become tremendously important in microelectronic, micromechanical and optical element manufacturing and the mechanism of nanometric cutting monocrystalline silicon has been a focused research topic. Molecular Dynamics (MD) simulation is developed as an effective way for studying the material removal process at nanometric scale. Approach: Molecular Dynamics (MD) simulation of nanometric cutting is … …Current Research in Nanotechnology, Vol. 1, Issue 2 · 21 Jun 2011 · 8,403 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordFreezing and Thawing Durability of Very High Strength ConcreteSameer Hamoush, Miguel Picornell-Darder, Taher Abu-Lebdeh, Ahmed MohamedProblem statement: The newly developed Very High Strength Concrete (VHSC), having compressive strengths of 29 ksi and flexural strengths of 6 ksi, represents a breakthrough in concrete technology. Study to further enhance the properties of this new concrete is continuing. Approach: The objective of this study is to investigate the effect of exposing Very High Strength Concrete (VHSC) specimens to … …American Journal of Engineering and Applied Sciences, Vol. 4, Issue 1 · 28 Jan 2011 · 8,817 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordSubway Train Braking System: A Fuzzy Based Hardware ApproachMamun Bin Ibne Reaz, Jubayer Jalil, Hafizah Husain, Badariah BaisProblem statement: Automated subway train-braking system require perfection, efficiency and fast response. In order to cope with this concerns, an appropriate algorithm need to be developed which need to be implemented in hardware for faster response. Approach: In this research, the FPGA realization of fuzzy based subway train braking system has been presented on an Alter FLEX10K device to provide … …American Journal of Applied Sciences, Vol. 8, Issue 7 · 24 Jun 2011 · 7,175 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordSynthesis and Calcium Channel Blocking Activity of 1, 4-Dihydropyridine Derivatives Containing Ester Substitute and Phenyl Carbamoyl GroupBassem Sadek, Khairi Mustafa Salem Fahelelbom, Laurentiu Morusciag, Sigurd ElzProblem statement: Several studies on the synthesis of new nifedipine analogs have been carried out, but the literature reveled that no study on the synthesis and calcium channel blocking activity of the substituted ester with an amide (5-phenylcarbamoyl) moiety has been reported. Approach: Six new derivatives of m-nifedipine have been successfully synthesized by substituting an ester moiety with an amide … …American Journal of Applied Sciences, Vol. 8, Issue 4 · 18 Apr 2011 · 8,247 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordRenal Actions of Neutral Endopeptidase Inhibition in Rats with Chronic Heart FailureAmr M. Abbas, Ayman Z. Elsamanoudy, Adel ZalataProblem statement: We aim to evaluate the effects of acute and chronic inhibition of Neutral EndoPeptidase (NEP), by ONO-9902, on plasma and renal NEP gene expression, hemodynamic and renal parameters in rats with Chronic Heart Failure (CHF) following left Coronary Artery Ligation (CAL). Approach: Forty eight male Sprague-Dawley rats (220-240 g) were divided into sham and CAL groups. Myocardial infarction … …American Journal of Applied Sciences, Vol. 7, Issue 11 · 8 Nov 2010 · 7,087 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordScale Formation Due to Water Injection in Malaysian Sandstone CoresAmer Badr Bin Merdhah, Abu Azam Mohd YassinProblem statement: Scale deposition is one of the most serious oil field problems that inflict water injection systems primarily when two incompatible waters are involved. Approach: This study was conducted to investigate the permeability reduction caused by deposition of calcium, strontium and barium sulphates in sandstone cores from mixing of injected Malaysian sea waters (Angsi and Barton) and formation water … …American Journal of Applied Sciences, Vol. 6, Issue 8 · 31 Aug 2009 · 7,624 accessesView PDF Cite