نتایج جستجو برای: coadsorption of co o2
تعداد نتایج: 21197742 فیلتر نتایج به سال:
هدف از این تحقیق بررسی اثر نوع تراکتور و ادوات متصل به آن بر میزان گازهای خروجی و دمای روغن موتور در حین انجام عملیات مختلف بود. تراکتورهای مسی فرگوسن 285 ، رومانی 650 و گلدونی و همچنین ادوات، بذرپاش گریز از مرکز، گاوآهن برگرداندار، کولتیواتور، روتیواتور، سم پاش بوم دار پشت تراکتوری و گاوآهن چیزل مورد بررسی قرار گرفتند. میزان گازهای خروجی و دمای روغن با استفاده از دستگاه تست پنج گاز (fga 4100) ...
The Density of State and the Natural Bond Orbital calculations were carried out to study theoxidation of CO on Au14 nano cluster through two different mechanisms and determining the bestmechanism for the reaction. Chemisorption of O2 and CO on the nano cluster led to change in energy,density of state and its thermodynamic properties. We calculated the energy band gap between thehighest occupied...
Although lung diffusing capacity for carbon monoxide (DL(CO)) is a widely used test of diffusive O2 transfer, few studies have directly related DL(CO) to O2-diffusing capacity (DL(O2)); none has used the components of Dl(CO), i.e., conductance of alveolar membrane and capillary blood, to predict DL(O2) from rest to exercise. To understand the relationship between DL(CO) and DL(O2) at matched le...
abstract amino acids are building blocks of proteins, and play a vital role in living beings existence and their functionality. the interaction of these compounds with metal ions is of great importance to biochemists, and chemists, because their functions can be utilized as a model in understanding enzymes mechanism for transport of metal ions to tissues. among twenty essential amino acids w...
Since their introduction by Haruta, oxide supported Au catalysts with Au nanoparticles (NPs) of few nanometers in diameter have attracted enormous interest because of their high activity for various oxidation and reduction reactions most prominently the CO oxidation reaction. Mechanistic details and hence the physical origin of their high activity, however, are still controversial. Focusing on ...
Gasoline fuel vehicles cause emissions of airborne pollutants that are poisonous and have a deleterious effect on human health and the environment while natural gas fuels have less harmful effects on the environment and humans due to their greater environmental compatibility. The propose of this study is to investigate the concentration of CO, HC, O2 in the exhaust outlet of gas and diesel cars...
Aims. Solid O2 has been proposed as a possible reservoir for molecular oxygen in dense clouds through freeze-out processes. The aim of this work is to characterize quantitatively the physical processes that are involved in the desorption kinetics of CO–O2 ices by interpreting laboratory temperature programmed desorption (TPD) data. This information is used to simulate the behavior of CO–O2 ices...
برای انجام برازش، پتانسیل برهم کنش بر حسب چند جمله ای های لژاندر، p?، و توابع قدرت شعاعی، v?، بسط داده شده است. سپس با استفاده از چند جمله ای های لژاندر و توابع قدرت شعاعی، یک تابع مناسب در برنامه مطلب (matlab) طراحی شده که توانایی محاسبه ipess را برای فواصل بین مولکولی، r، از ? 1/2 تا ? 10 و زوایای دلخواه 2? را دارد. در گام دوم مقادیر ipess، v(r, ?2, ?)، در یک تابع انرژی پتانسیل مناسب برازش ش...
We present laboratory data on pure, layered and mixed CO and O2 ices relevant for understanding the absence of gaseous O2 in space. Experiments have been performed on interstellar ice analogues under ultra high vacuum conditions by molecular deposition at 14 K on a gold surface. A combination of reflection absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TPD) is u...
Background and Objectives: In this study, contribution of exhaust emission and CO distribution was estimated in enclosed residential complex parking. Materials and Methods: This was a descriptive - analytical study consisted of two stages. In the first stage, the emission contribution of vehicles was determined. In order to determine the contribution of exhaust gas emissions, through gas spe...
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