نتایج جستجو برای: hydrogen formation

تعداد نتایج: 657931  

2004
J. DUFOUR J. FOOS J. P. MILLOT

A search for the products of fusion reactions that could be triggered by sparking in hydrogen isotopes was carried out. No signatures above background were found. On the contrary, the excess energy production was confirmed in the simple hydrogen/palladium system. The formation of a tightly bound state of the hydrogen (deuterium) atom is hypothesized to explain these results.

Journal: :Physical review letters 2005
Hao Chang Jian Wu Bing-Lin Gu Feng Liu Wenhui Duan

We perform first-principles calculations to explore the physical origin of hydrogen-induced semiconductor surface metallization observed in beta-SiC(001)-3 x 2 surface. We show that the surface metallization arises from a novel mechanism of n-type doping of surface band via formation of hydrogen bridge bonds (i.e., Si-H-Si complex). The hydrogen strengthens the weak Si-Si dimers in the subsurfa...

Journal: :Physical chemistry chemical physics : PCCP 2013
Tomonori Ohba Hirofumi Kanoh

The hydration structure of NaCl aqueous solution was elucidated in carbon nanotubes (CNTs) on the basis of canonical ensemble Monte Carlo simulations. Hydration shells were preferentially formed even in narrow CNTs to gain stabilization energy, whereas hydrogen bonding between water molecules in such CNTs was sacrificed. Nanoscale-confined aqueous electrolyte solutions therefore prioritize hydr...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان - دانشکده علوم 1390

در این پژوهش به منظور درک سن و محیط رسوبی سازند آسماری در برش کوه شجبیل، شمال غرب یاسوج به ضخامت 375 متر 171 نمونه برداشت گردیده است. سازند آسماری در برش مورد مطالعه با معیارهای سنگ شناختی به سه واحد مشخص تفکیک شده است. این واحد ها با داشتن شمای آهک های مسیو، ضخیم، متوسط و نازک لایه، آهک های نازک لایه ی مارنی و بعضاً مارن مشخص می گردد. در این برش تعداد 18 جنس و 29 گونه از فرامینیفرهای بنتیک شنا...

2017
John Parnell Nigel Blamey

A suite of Permian sylvite samples from Boulby potash mine, Yorkshire, UK, consistently yield traces of hydrogen upon analysis by a cold crush technique for liberating volatiles from entrapped fluid inclusions. In contrast, accompanying halite samples do not yield hydrogen. These data suggest the formation of hydrogen by radiolysis of water due to irradiation from potassium in the sylvite. The ...

Journal: :Acta biomaterialia 2013
Julia Kuhlmann Ivonne Bartsch Elmar Willbold Sven Schuchardt Olaf Holz Norbert Hort Daniel Höche William R Heineman Frank Witte

Magnesium materials are of increasing interest in the development of biodegradable implants as they exhibit properties that make them promising candidates. However, the formation of gas cavities after implantation of magnesium alloys has been widely reported in the literature. The composition of the gas and the concentration of its components in these cavities are not known as only a few studie...

Different Aluminum: alkaline earth metal atomic weight ratios effects on structure transformations in alanates nanopowders were studied. Changes in crystal structures from alane to alanates by increasing alkaline earth metals dopants in the mixture with slight changes in crystal structures from rhombohedral centered – trigonal (alane) to trigonal (magnesium alanate), and monoclinic (calcium ala...

Journal: :Acta medica Okayama 1981
S Watanabe M Ogata

Generation of superoxide and hydrogen peroxide during interaction of nitrite with human hemoglobin was detected by chemiluminescence of luminol. Luminol chemiluminescence was inhibited by the addition of superoxide dismutase (SOD) and catalase. Methemoglobin formation induced by nitrite was also inhibited by the addition of SOD and catalase. The mechanism of methemoglobin formation by nitrite w...

Journal: :int. journal of mining & geo-engineering 2014
ahmad vaezian mansur ziaii mohammad reza kamali ali kadkhodaie-ilkhchi

in the this research, the hydrocarbon generation potential of the gadvan formation as a probable source rock was investigated in the central part of the persian gulf at the borders of iran. type and maturity level of kerogen were investigated in six wells using the results of rock-eval pyrolysis and compared with results yielded by the modelling software program known as pars basin modeler (pbm...

2007
Hagai B. Perets Adina Lederhendler Ofer Biham Gianfranco Vidali Ling Li Sol Swords Emanuele Congiu Joe Roser Giulio Manicó John Robert Brucato

Experimental results on the formation of molecular hydrogen on amorphous silicate surfaces are presented for the first time and analyzed using a rate equation model. The energy barriers for the relevant diffusion and desorption processes are obtained. They turn out to be significantly higher than those obtained earlier for polycrystalline silicates, demonstrating the importance of grain morphol...

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