نتایج جستجو برای: ge

تعداد نتایج: 19943  

Journal: :Physical review letters 2003
Midori Kawamura Neelima Paul Vasily Cherepanov Bert Voigtländer

The step-flow growth mode is used to fabricate Si and Ge nanowires with a width of 3.5 nm and a thickness of one atomic layer (0.3 nm) by self-assembly. Alternating deposition of Ge and Si results in the formation of a nanowire superlattice covering the whole surface. One atomic layer of Bi terminating the surface is used to distinguish between the elements Si and Ge. A difference in apparent h...

Journal: :Physical review letters 2000
Z Y Lu F Liu C Z Wang X R Qin B S Swartzentruber M G Lagally K M Ho

We carry out a comparative study of the energetics and dynamics of Si-Si, Ge-Ge, and Ge-Si ad-dimers on top of a dimer row in the Si(001) surface, using first-principles calculations. The dynamic appearance of a Ge-Si dimer is distinctively different from that of a Si-Si or Ge-Ge dimer, providing a unique way for its identification by scanning tunneling microscopy (STM). Its "rocking" motion, o...

Journal: :زراعت دیم ایران 0
رضا محمدی معاونت موسسه تحقیقات کشاورزی دیم- کرمانشاه محمد آرمیون مرکز تحقیقات کشاورزی و منابع طبیعی، ایلام اسماعیل زادحسن موسسه تحقیقات کشاورزی دیم کشور مسعود اسکندری مرکز تحقیقات کشاورزی و منابع طبیعی، خراسان شمالی

this research was investigated to analyze genotype × environment (ge) interaction for grain yield in durum wheat multi-environment trials (met) conducted in dryland agricultural research stations (dari) using gge (g + ge interaction) biplot methodology and joint regression analysis (b +  s2di). the environment, ge interaction and genotype effects were accounted for 84%, 7.7% and 2.3% of total s...

Journal: :The Journal of antibiotics 1995
P Ferrari L Colombo S Stella E Selva L F Zerilli

GE37468 A is a novel antibiotic produced by Streptomyces sp. ATCC 55365. It has molecular mass 1309.48 and formula C59H52O12N14S5 and belongs to the thiazolyl peptide group of antibiotics. The structure was elucidated by 1H and 13C NMR and MS studies on intact molecule and its hydrolysis products. The antibiotic is a highly modified peptide containing a macrocycle and a side chain composed of a...

2014
Alain Portavoce Khalid Hoummada Antoine Ronda Dominique Mangelinck Isabelle Berbezier

The Stranski-Krastanov growth of Ge islands on Si(001) has been widely studied. The morphology changes of Ge islands during growth, from nucleation to hut/island formation and growth, followed by hut-to-dome island transformation and dislocation nucleation of domes, have been well described, even at the atomic scale, using techniques such as scanning tunneling microscopy and transmission electr...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ایلام 1388

کاربنها حدواسطه های خیلی فعالی بوده که بسیار مورد توجه شیمیدانان قرار گرفته اند. در این تحقیق ابتدا محاسبه کوانتمی انرژی یکتایی و سه تایی کاربنهای سه عضوی شامل ساختارهای:الف) ,c2h2mب) ,c2h4mپ) c2h6m که(m=si, ge, sn ,pb) صورت گرفت. سپس محاسبه کوانتمی انرژی یکتایی و سه تایی کاربنهای چهار عضوی شامل ساختارهای:ت) ,c3h4m.ج) c3h6mانجام گرفت.و در آخر مقایسه بین سیستم حلقوی سه عضویی و چهار عضویی وسیستم ...

Journal: :Public health nutrition 2015
Jessica T Monroe Ingrid E Lofgren Becky L Sartini Geoffrey W Greene

OBJECTIVE To investigate the effectiveness of an online, interactive intervention, referred to as the Green Eating (GE) Project, to motivate university students to adopt GE behaviours. DESIGN The study was quasi-experimental and integrated into courses for credit/extra credit. Courses were randomly stratified into experimental or non-treatment control. The 5-week intervention consisted of fou...

Journal: :Nano letters 2015
Zhongjian Zhang David C Dillen Emanuel Tutuc Edward T Yu

We report tip-enhanced and conventional Raman spectroscopy studies of Ge-Si0.5Ge0.5 core-shell nanowires in which we observe two distinct Ge-Ge vibrational mode Raman peaks associated with vibrations in the Ge nanowire core and at the Ge-Si0.5Ge0.5 interface at which a quantum-confined hole gas is formed. Tip enhanced Raman measurements show dramatically increased sensitivity to the modes at th...

2011
Andrzej J. Gorczko

Isotope clusters in library electron ionization mass spectra of germanes often appear a few u lower than theoretically expected from elemental composition; for example, the dominant peak of the Ge(4)H(10)(+) pattern is shifted 8 u down. This phenomenon is due to combinations of three essential components: the molecular ion Ge(n)H(2n+2)(+) and two products of hydrogen elimination, Ge(n)H(+) and ...

Journal: :Chemical communications 2012
Miriam M Gillett-Kunnath Alvaro Muñoz-Castro Slavi C Sevov

We report the synthesis, characterization, and computational rationalization of the first trimetallic deltahedral Zintl ions. The novel nine-atom clusters were structurally characterized as dimers of [(Sn(6)Ge(2)Bi)(2)](4-) with Ge-Ge intercluster bonds. They are synthesized either by reacting bimetallic clusters (Sn(9-x)Ge(x))(4-) with BiPh(3) or by direct extraction from precursors with nomin...

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