نتایج جستجو برای: standard enthalpy of formation
تعداد نتایج: 21219949 فیلتر نتایج به سال:
BACKGROUND One of the main topics in the development of quantitative structure-property relationship (QSPR) predictive models is the identification of the subset of variables that represent the structure of a molecule and which are predictors for a given property. There are several automated feature selection methods, ranging from backward, forward or stepwise procedures, to further elaborated ...
abstract the main purpose of this study was to investigate whether there was any significant difference between the speaking achievement of learners who were trained by means of consciousness raising of sociolinguistic skills and that of learners who were trained without the above mentioned task. the participants of this study consist of 60 intermediate level students participating languag...
Abstract The Gibbs energy Δ G kp ( τ , T ) of kink pair formation on screw dislocations in bcc Nb has been determined as a function shear stress at different temperatures ⩽ 100 K using an accelerated molecular dynamics method and bond-boost potential. From ), the dependence entropy enthalpy could be obtained standard thermodynamic relations. increases with increasing stress, following phenomeno...
The heat of vaporization of a pure substance at its normal boiling temperature is a very important property in many chemical processes. In this work, a new empirical method was developed to predict vaporization enthalpy of pure substances. This equation is a function of normal boiling temperature, critical temperature, and critical pressure. The presented model is simple to use and provides an ...
polycyclic aromatic hydrocarbon (pah) plays an important role in the formation of combustion-generatedparticles such as soot, and their presence in atmosphere aerosols has been widely shown. the formation of five-membered rings, detected in combustion effluent, is of great interest due to their genotoxic activity.the present study reports an investigation of the electronic structure of acenapht...
this study was an attempt to investigate the effect of using c-test passages on the reading comprehension and incidental vocabulary learning of iranian intermediate efl learners. the participants were 60 male efl learners at kish mehr institute in garmsar. in fact, there were two groups, an experimental group and a comparison group with 30 students in each. the participants were pretested throu...
this study was an attempt to investigate the effect of subtitling on vocabulary learning among iranian intermediate students. to find the homogeneity of the groups, tofel test was administered to student in kish mehr institute in garmsar. after analyzing the data, 60 participants (female students) who scored within the range of one standard deviation above and below the mean, were selected as h...
Equations are set up to calculate the observed standard free energy change for the hydrolysis of ATP (namely, AGobs, the quantity evaluated on the basis of total ATP, ADP, and orthophosphate concentrations at equilibrium, irrespective of the state of ionization or complex formation, or both) as a function of pH and Mg2+ ion concentration. The variation of AGobs is analyzed in terms of AG, the s...
Equations are set up to calculate the observed standard free energy change for the hydrolysis of ATP (namely, AGobs, the quantity evaluated on the basis of total ATP, ADP, and orthophosphate concentrations at equilibrium, irrespective of the state of ionization or complex formation, or both) as a function of pH and Mg2+ ion concentration. The variation of AGobs is analyzed in terms of AG, the s...
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