نتایج جستجو برای: shifts

تعداد نتایج: 57697  

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 1993
mahdi jalali heravi mahdi moosavi

the 13c chemical shifts for a series of compounds which includes carboxylic acids, aldehydes, ethers, ketones and hydrocarbons were simulated by using the parametric techniques. the observed chemical shifts were related to numerically encoded structural parametes called descriptors. two new electronic descriptors were added to the previous descriptors. ploting of experimental versus calculated ...

Journal: :journal of english language studies 0
hossein vossoughi professor of applied linguistics, teacher education university, tehran, iran farhad pourebrahim ma in translation studies, islamic azad university science and research branch, tehran, iran

this study was an attempt to investigate the realization of catford’s shifts in the farsi translation of english psychology texts, a product-oriented point of view, shedding light on the areas farsi is different english. inspired by a study conducted by khorshidi (2010), the two questions raised in the study sought to detect the kinds of shifts applied in the translation of english psychology t...

‎In the following text for arbitrary $X$ with at least two elements‎, ‎nonempty countable set $Gamma$‎ ‎we make a comparative study on the collection of generalized shift dynamical systems like $(X^Gamma,sigma_varphi)$ where $varphi:GammatoGamma$ is an arbitrary self-map‎. ‎We pay attention to sub-systems and combinations of generalized shifts with counterexamples regarding Devaney‎, ‎exact Dev...

Journal: :Advances in Mathematics 1973

Journal: :caspian journal of chemistry 0
seyed naser azizi analytical division, faculty of chemistry, university of mazandaran, babolsar, iran salma ehsani tilami university of mazandaran fatematozzahra mosavi university of mazandaran

nowadays nmr spectroscopy becomes a powerful tool in chemistry because of the nmr chemical shifts. hartree–fock theory and the gauge-including atomic orbital (giao) methods are used in the calculation of 29si nmr chemical shifts of various silicate species in the silicate solution as initial components for zeolite synthesis both in gas and solution phase. calculations have been performed at geo...

Journal: :international journal of hospital research 2015
sedigheh azimi mohammad mehdi sepehri masoud etemadian

background and objectives: in this paper, a real life nurse scheduling model is described based on the conditions in iranian hospitals such as monthly shift rotation, consecutive morning and evening shifts and consecutive evening and night shift.   methods: the developed model considers both hospital constraints and nurses’ preferences. hospital constraints include assigning adequate qualified ...

Journal: :journal of optimization in industrial engineering 2010
ahmad ostadsharifmemar seyed taghi akhavan niaki

in this paper, first the available single charting methods, which have been proposed to detect simultaneous shifts in a single process mean and variance, are reviewed. then, by designing proper simulation studies these methods are evaluated in terms of in-control and out-ofcontrol average run length criteria (arl). the results of these simulation experiments show that the ewma and ewms methods ...

Journal: :journal of the iranian chemical research 0
naghi saadatjou department of applied chemistry, faculty of science, university of semnan, semnan, iran geoffrey hallas department of colour and polymer chemistry, university of leeds, leeds ls2 9jt, england

one series of half-analogues of michler’s ketone containing one or more terminal methoxysubstituents with variable tertiary amino groups have been used in this study. nmr spectralresults for the parent ketones confirm earlier findings that ortho proton shifts are apparentlyindependent from steric effects in derivatives of michler’s ketone because the ring current andcarbonyl-induced shifts are ...

Journal: :iranian economic review 0
omid ranjbar allameh tabataba'i university, tsangyao chang department of finance, feng chia university chien-chiang lee department of finance, national su yat-sen university zahra (mila) elmi faculty of economics, university of mazandaran

abstract this paper attempts to re-investigate the catching-up (stochastic convergence) hypothesis among the selected 16 oecd countries applying the time series approach of convergence hypothesis with annual data over one century. to reach this aim, we propose a model which specifies a trend function, incorporating both types of structural breaks – that is, sharp breaks and smooth shifts using ...

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