نتایج جستجو برای: he
تعداد نتایج: 157371 فیلتر نتایج به سال:
The possible occurrence of bound states $$^3$$ He atoms in the vicinity a weakly attractive substrate coated with thin superfluid $$^4$$ film is investigated by first principle computer simulations. No evidence seen such states, even case weakest substrate, i.e., Cs; single atom always binds to free surface, regardless thickness film. A comparison density profiles computed this work those yield...
یک سری پنج تایی لیگاند چهار دندانه سولفور دهنده: en-bis-dtcna = ethylenebisdithiocarbamate sodium salt pn-bis-dtcna = propylenebisdithiocarbamate sodium salt bu-bis-dtcna = butylenebisdithiocarbamate sodium salt he-bis-dtcna = hexylenebisdithiocarbamate sodium salt oc-bis-dtcna = octylenebisdithiocarbamate sodium salt تهیه شده است. این لیگاندها به روش های ir ,1h-nmr و تجزیه عنصری شن...
In this paper we present an approach to abductive reasoning in law by examining it in the context of an argumentation scheme for practical reasoning. We present a particular scheme, based on an established scheme for practical reasoning, that can be used to reason abductively about how an agent might have acted to reach a particular scenario, and the motivations for doing so. Plausibility here ...
In this work we present the predictions of a modified version of the “two-infall model” (Chiappini et al. 1997) for the evolution of He, He and D in the Galaxy, as well as their distributions along the Galactic disk. In particular, we show that when allowing for extra-mixing process in low mass stars (M< 2.5 M⊙), as predicted by Charbonnel and do Nascimento (1998), a long standing problem in ch...
Using a finite-range density functional, we have investigated the energetics and structural features of mixed helium clusters. The possibility of doping the cluster with a molecule of sulfur hexafluoride is also considered. It is seen that the repulsion introduced by the impurity strongly modifies the properties of the smallest drops. Although only a qualitative comparison is possible, the gros...
U V photoelectron spectra of the title com pounds are rep orted . A ssignm ents are m ade with the help of H e(I)/H e(II) intensity differences, shift effects upon substitu tion and com parison with re la ted m olecules. Previously draw n conclusions about the electronic structure of similar com plexes also hold for the com pounds. It is indicated that the ionization energy for the sym m etri...
.مطالعه ای تئوری با استفاده از روش bmk و سری پایه aug-cc-pvtz روی سی مولکول شامل گاز نجیب به فرم ngr(ng= he, ne, ar, kr, xe r=ch3, cn, cch, bo, bnh, h, beo, auf)و fngr انجام شد. ساختار، انرژی تفکیک و پارامترهای اتم در مولکول(aim) ومرتبه پیوند طبیعی(nbo) برای همه ترکیبات به دست آمدند. مقادیر انرژی تفکیک نشان داد که همه ترکیبات غیر از farcn وfheh پایدار هستند و میزان پایداری آنها از he تا xe افزا...
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