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Search Results: 1 - 10 of 401276 matches for " M.;Saptoadi "
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Emission factor of single pellet cake seed Jatropha curcas in a fix bed reactor
Pambudi, N. Agung;Torii, Shuichi;Syamsiro, M.;Saptoadi, Harwin;Gandidi, Indra Mamad;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2012, DOI: 10.1590/S1678-58782012000200009
Abstract: the objective of this study is to evaluate the emission factor of oil cake seed jatropha curcas that was formed into pellets with three parameters: pyrolisis, densification and air flow rate. the effect of pyrolisis was investigated using four samples of pellet: nonpyrolysis pellet, 90 minutes pyrolysis pellet, 120 minutes pyrolysis pellet, 150 minutes pyrolysis pellet. the effect of densification was provided by three samples: 11 mm, 13 mm, and 16 mm diameter. furthermore, the parameter of air flow rate was varied from 0.1 m/s to 0.4 m/s. the results show that the lowest emission factor occurs in the non-pyrolysis pellet containing 14.3 gram carbon monoxide per kilogram pellet. meanwhile the best densification was obtained by 13-mm diameter pellet containing 14.8 gram carbon monoxide. air flow rate of 2.0 m/s was the suitable air flow rate to achieve lowest emission factor.
Thermogravimetric Analysis and Global Kinetics of Segregated MSW Pyrolysis
Dwi Aries Himawanto,Indarto Indarto,Harwin Saptoadi,Tri Agung Rohmat
Modern Applied Science , 2011, DOI: 10.5539/mas.v6n1p120
Abstract: Municipal Solid Wastes (MSW) has great potential as a clean, renewable feedstock for producing modern energy carriers through thermochemical, called pyrolysis. However, despite their enormous potential as energy sources, their thermal characteristics are still not well known. Investigations about segregated MSW slow pyrolysis behaviors have done using macro balance apparatus. Four components of segregated MSW (bamboo wastes, banana leaves wastes, snack wrap wastes and styrofoam wastes) and their bleds were thermally degraded through thermogravimetry analysis and their characteristics such as pyrolysis profiles and activation energies were analysed and calculated. About 20 grams of samples pyrolysed under 100 ml/min N2 at constant heating rate 10 0C/min from room temperature to 400 0C final pyrolysis temperature which kept constant for 30 minutes. The nitrogen flow as swept gas which ensures an inert atmosphere during the pyrolysis test.In order to indenty the pyrolysis characteristics of samples, thermogravimetry analysis performed. The recorded data were weight losses and sample temperature during the pyrolisis process. The results of the research showed bamboo wastes and banana leaves wastes could be catogorized as low stability organics, while snack wrap wastes could be catagorized as polymer mixture materials and styrofoam wastes could be catagorized as plastic materials.Meanwhile the blends materials pyrolysis profiles followed the their components characteristics which signed with the peak temperature which occured. This study also found that global kinetic method could to calculate the pyrolysis activation energy
Study of Duct Characteristics Deduced from Low Latitude Ground Observations of Day-Time Whistler at Jammu  [PDF]
M. Altaf, M. M. Ahmad
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.33032

Propagation characteristics of low latitude whistler duct characteristics have been investigated based on day-time measurements at Jammu. The morphogical characteristics of low latitude whistlers are discussed and compared with characteristics of middle and high latitude whistlers. The Max. electron density (Nm) at the height of the ionosphere obtained from whistler dispersion comes out to be higher than that of the background which is in accordance with the characteristics of whistler duct. The equivalent width is found to be close to the satellite observations and the characteristics of whistler duct in low latitude ionosphere are similar to those in middle and high latitude ionosphere. The width of ducts estimated from the diffuseness of the whistler track observed during magnetic storm is found to lie in the range of 50 - 200 Km.

Review Article: Immobilized Molecules Using Biomaterials and Nanobiotechnology  [PDF]
Magdy M. M. Elnashar
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2010, DOI: 10.4236/jbnb.2010.11008
Abstract: Immobilized molecules using biomaterials and nanobiotechnology is a very interesting topic that touching almost all aspects of our life. It uses the sciences of biology, chemistry, physics, materials engineering and computer science to develop instruments and products that are at the cutting edge of some of today’s most promising scientific frontiers. In this review article, the author based on his experience in this arena has tried to focus on some of the supports for im-mobilization; the most important molecules to be immobilized such as DNA, cells, enzymes, metals, polysaccharides, etc and their applications in medicine, food, drug, water treatment, energy and even in aerospace. He specified a special section on what is new in the arena of supports and technologies used in enzyme immobilization and finally a recommendation by the author for future work with a special attention to up-to-date references.
Using of the generalized special relativity (GSR) in estimating the neutrino masses to explain the conversion of electron neutrinos  [PDF]
M. H. M. Hilo
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.34044
Abstract: In this work the Generalized Special Relativity (GSR) is utilized to estimate masses of some elementary particles such as, neutrinos. These results are found to be in conformity with experimental and theoretical data. The results obtained may explain some physical phenomena, such as, conversion of neutrinos from type to type when solar neutrino reaches the Earth.
Postischemic Lower Extremity Wounds Treated with and without Negative Pressure Dressing  [PDF]
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.37075
Abstract: Background: Vacuum-assisted dressing is a noninvasive closure system of the wound, which makes localized and controlled negative pressure. Its mechanical tension reduces edema, stimulates granulation tissue formation and angiogenesis, and prepares the wound bed for closure. In this study, a patient has been presented, who suffered from serious lower extremity wounds due to arterial emboli, one of her wounds has been treated with vacuum-assisted dressing and the other with conventional dressing to evaluate the efficacy of vacuum-assisted dressing in acute ischemic wounds. Methods: A 65-year-old female patient was admitted to the emergency clinic, due to complaint of severe pain in her right lower extremity which suggested an acute arterial occlusion. She immediately underwent an embolectomy operation; however, a few days later, severe ischemia on the leg and foot became appearant. All of the necrosis was sharply debrided under sterile conditions in the operating room, and then lower leg wound was covered with vacuum-assisted dressing, also calcaneal wound was dressed with silver sulphadiazine. Results: Eighteen days after the first dressing with negative pressure, distal leg wound became ready for closure, whereas, enough granulation tissue over the calcaneal area developed merely thirty-four days later. Calcaneal wound closed spontaneously within fifty-three days. Conclusions: When dealing with this experience, using the negative pressure dressing in patient with severe lower limb wounds following arterial emboli, accelerates wound healing by means of developing the granulation tissue, and rapidly prepares the wound for closure, so it may reduce the risk of amputation.
Laplace Transform Method for Unsteady Thin Film Flow of a Second Grade Fluid through a Porous Medium  [PDF]
M. Ali, M. Awais
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.53017

In this article, we have effectively used the Numerical Inversion of Laplace transform to study the time-dependent thin film flow of a second grade fluid flowing down an inclined plane through a porous medium. The solution to the governing equation is obtained by using the standard Laplace transform. However, to transform the obtained solutions from Laplace space back to the original space, we have used the Numerical Inversion of Laplace transform. Graphical results have been presented to show the effects of different parameters involved and to show how the fluid flow evolves with time.

An Integral Collocation Approach Based on Legendre Polynomials for Solving Riccati, Logistic and Delay Differential Equations  [PDF]
M. M. Khader, A. M. S. Mahdy, M. M. Shehata
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.515228

In this paper, we propose and analyze some schemes of the integral collocation formulation based on Legendre polynomials. We implement these formulae to solve numerically Riccati, Logistic and delay differential equations with variable coefficients. The properties of the Legendre polynomials are used to reduce the proposed problems to the solution of non-linear system of algebraic equations using Newton iteration method. We give numerical results to satisfy the accuracy and the applicability of the proposed schemes.

ДОСЛ ДЖЕННЯ АНАЛ ТИЧНОГО МЕТОДУ ОЦ НЮВАННЯ ЙМОВ РНОСТ ПОТЕНЦ ЙНО КОНФЛ КТНИХ СИТУАЦ Й В ПОВ ТРЯНОМУ РУС The study of the analytical method of evaluating the probability of potential conflict situations in air traffic Исследование аналитического метода оценки вероятности потенциально конфликтных ситуаций в воздушном движении
В.M. Василь?в
Proceedings of National Aviation University , 2007,
Abstract: Розглянуто застосування запропонованого ран ше методу оц нювання ймов рност потенц йних конфл кт в для системи керування пов тряним рухом. Досл джено властивост методу, наведено проанал зовано результати комп’ютерного моделювання. Application of the method of potential conflicts probability evaluation offered before for air traffic control system is considered. The properties of the method are investigated, results of computer modeling are represented and analyzed. Рассмотрено применение предложенного ранее метода оценки вероятности потенциальных конфликтов для системы управления воздушным движением. Исследованы свойства метода, приведены и проанализированы результаты компьютерного моделирования.
МОДЕЛЮВАННЯ ТА УПРАВЛ ННЯ В БРОАКУСТИЧНИМ ВИПРОМ НЮВАННЯМ ОДНОР ДНО ПЛАСТИНИ П Д Д Ю ЗОВН ШН Х КОНЦЕНТРОВАНИХ СИЛ Modeling and management vibroacoustic emission homogeneous plate under the action of external forces concentrated Моделирование и управление виброакустическим излучением однородной пла
В.M. Макаренко
Proceedings of National Aviation University , 2009,
Abstract: Подано модель проведено досл дження акустичного випром нювання та поперечного руху прямокутно пластини. Розв’язок отримано на основ р внянь класично теор коливань пластини. Розглянуто в броакустичне випром нювання пластин з в льно обпертими граничними умовами. Як зовн шн збудження використано концентрован гармон чн сили. Встановлено законом рност зм ни звукового випром нювання залежно в д параметр в зовн шн х збуджень. Для перев рки анал тичого п дходу, використаного для розрахунк в, виконано експеримент. Власн частоти коливань в льно пластини, отриман анал тично, сп вв дносяться з результатами експерименту з малою похибкою. The model of rectangular plate acoustic radiation and transverse motion were presented, and its investigation was performed. The solution is received based on classisal plate theory. Vibration response and sound radiation of plates with simply-supported boundary conditions was discussed. Concentrated harmonic forces are used as an external excitation. The general confirmities to the law have been established for the changes of sound radiation, depending on the parameters of external excitations. An experiment was performed for justification of analytical approach, which is used for computations. Eigenfrequencies of free plate oscillations, which are received analytically, are in good agreement with experimental results. Представлены модель и проведены исследования акустического излучения и поперечного движения прямоугольной пластины. Решен
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