نتایج جستجو برای: سیستم ni

تعداد نتایج: 126467  

2010
Toshiyuki Fujii Frédéric Moynier Nicolas Dauphas Minori Abe

Nickel plays a central role as an enzyme co-factor in the metabolism of methanogenic Archaea. Methanogens can fractionate Ni isotopes during assimilation, opening the possibility of using the stable isotopic composition of Ni as a biomarker. However, other sources of Ni isotopic variations need to be evaluated before one can establish Ni isotopes as an unambiguous tracer of methanogenesis in th...

Journal: : 2022

امروزه توسعه سیستم‌های کارآمد و اثربخش بهداشت درمان به یکی از نگرانی‌های اصلی دولت‌ها تصمیم‌گیرندگان تبدیل شده است. تأمین به‌موقع دارو کارایی سیستم موجودی توزیع، نقشی حیاتی در زنجیره بیمارستانی دارند برای افزایش این فعالیت‌ها، فرآیند تصمیم‌گیری مناسب مدیریت ضروری نظر می‌رسد. پژوهش یک مدل دوهدفه به‌صورت برنامه‌ریزی خطی عدد صحیح مختلط جریان اطلاعات ارائه اهداف حداقل­کردن هزینه‌های خرید، نگهداری، ...

Journal: : 2022

نخستین گام در راستای تحلیل و ارزیابی ریسک‌های زنجیره تأمین شناسایی این ریسک‌ها است. روش‌های مرسوم بر اساس فیلترهای دستی یا خودکار داده‌­محور ارائه شده فیلتر به‌­دلیل محدودیت‌های نمونه‌گیری دارای مشکلات اعتبارسنجی هستند از طرف دیگر مبتنی داده، داده‌های ریسک که پیچیده مبهم هستند، عملکرد ضعیفی دارند. برای پرکرده خلل پژوهشی، پژوهش، چارچوبی تعاملی بین تحلیل‌­گر ماشین حجم وسیعی حوزه مواد غذایی با است...

2017
Mian Hammad Nazir Zulfiqar Ahmad Khan Adil Saeed Vasilios Bakolas Wolfgang Braun Rizwan Bajwa Saqib Rafique

A study has been presented on the effects of intrinsic mechanical parameters, such as surface stress, surface elastic modulus, surface porosity, permeability and grain size on the corrosion failure of nanocomposite coatings. A set of mechano-electrochemical equations was developed by combining the popular Butler-Volmer and Duhem expressions to analyze the direct influence of mechanical paramete...

Journal: :Bioinorganic Chemistry and Applications 2003
I. Tsivikas M. Alexiou A. A. Pantazaki C. Dendrinou-Samara D. A. Kyriakidis D. P. Kessissoglou

The synthesis, characterization and the biological study of a series of Ni(ll)(2)(carboxylato)(2) [12- MC(Ni(II)N(shi)2(pko)2)-4][12-MC(Ni(ii)N(sh03(pko))-4] (CH(3)OH)(3)(H(3)O) fused 12-membered metallacrowns with 10 metal ions and commercial available herbicides or anti-inflammatory drugs as carboxylato ligands are reported. All the compounds have a mixed ligand composition with salicylhydrox...

2016
Shuang He

Ni-based superalloys are the important materials for gas turbines in advanced aeroplane engines . The addition of refractory elements to these superalloys, such as rhenium and tungsten, can significantly improve the hightemperature performance by so-called solid-solution hardening. Although the strengthening effect of refractory elements in Ni-based superalloys have been known for a long time, ...

Journal: :Dalton transactions 2012
Stephen J Tereniak Elodie E Marlier Connie C Lu

The three-coordinate Ni(I) complex Ni(Cl)(P(2)), where P(2) is the diphosphine (iPr)DPDBFphos, reacts with the acids HCl·(dioxane) and 2,6-lutidinium chloride to generate Ni(H)(Cl)(P(2)) and Ni(Cl)(2)(P(2)). Photolysis of the Ni(H)(X)(P(2)) (for X = Cl, Br) results in formation of H(2) and the Ni(I) halide. This reaction also proceeds in reverse when heated.

2007

Nickel hyperaccumulator plants contain unusually elevated levels of Ni (> 1 000 μg Ni/g). Some insect herbivores, including Lygus hesperus (Western tarnished plant bug), have been observed feeding on the California Ni hyperaccumulator Streptanthus polygaloides. This bug may be able to utilize S. polygaloides as a host either through its feeding behavior or by physiological tolerance of Ni. This...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2012
Meng Hsiung Weng Hsin-Tsung Chen Yao-Chun Wang Shin-Pon Ju Jee-Gong Chang M C Lin

The adsorption, dissociation, and diffusion of hydrogen in Ni(100) and Ni(100)/YSZ(100) slabs with two different interfaces (Ni/cation and Ni/O interface) have been studied by the density functional theory (DFT) with the Perdew-Wang functional. The H(2) molecule is found to preferentially absorb on a Top (T) site with side-on configuration on the Ni(100) surface, while the H-atom is strongly bo...

2008
C. Q. Wang C. Yan M. Y. Li Y. Huang

The coupling effect of interfacial reactions between two pads in Ni-SnAg-Cu and Au/Ni/Cu-SnAg-Cu solder joints was investigated in this paper. After reflow soldering, a large amount of Cu can diffuse across the solder joint to the opposite pad to form (Cu,Ni)6Sn5 IMC on the Ni pad in Ni-SnAg-Cu solder joint. A little Ni can also be detected in Cu6Sn5 layer, which contains some trapped solder, o...

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