نتایج جستجو برای: layer by layer

تعداد نتایج: 7153986  

ژورنال: پژوهش فیزیک ایران 2019
Beygzadeh, S, Mehrabian, M,

The relatively low power conversion efficiency (PCE) of quantum dot sensitized solar cells (QDSSCs) is attributed to charge recombination at the interfaces. Charge recombination process could be suppressed by coating the QD layer with a wide band gap semiconductor such as ZnS, which acts as a blocking layer between the QDs and hole transport material (HTM). In present study, to improve PCE of P...

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ژورنال: بلورشناسی و کانی شناسی ایران 2018
برهانی زرندی, محمود, جهان بخشی زاده, ناصر, ناطقی, محمدرضا,

Organic-inorganic perovskite (CH3NH3PbI3), due to an appropriate energy gap to absorb sunlight, is used as an absorbent layer in third generation solar cells. Crystallinity of light absorbing layer plays an important role in the performance of perovskite solar cells and substrate plays an important role on crystallinity of light absorbing layer. In superstructure solar cells, alumina (aluminum ...

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ژورنال: سلامت و محیط زیست 2011
احمدی مقدم, مهدی, تکدستان, افشین, جعفرزاده حقیقی فرد, نعمت الله, دلبازی, نسیم,

Backgrounds and Objectives: Improvement of water quality standards and inability of mono layer filters in producing such quality caused researchers attended to multi layer filters. Due to specific characteristics of anthracite and leca can improve removal of organic materials and Surface over flow rate. The aim of this research was evaluation performance of dual media filters (anthracite/leca) ...

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Journal: Biomacromolecular Journal 2016
Mahdi Alijanianzadeh, Maryam Abdolirad, Rassoul Khalilzadeh,

Crystalline surface layer proteins (S-layer proteins) have considerable potential for the crystalline arrays in biotechnology, biomimetics and nonlife applications, including areas such as microelectronics and molecular nanotechnology. The extensive application potential of surface layers in nanobiotechnology is according to the particular inherent attributes of the single molecular arrays cons...

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ژورنال: International Journal of Optics and Photonics 2007
Aldea, G. , C. Chitanu, G. , C. Simionescu, B., Gutiérrez, H. , M. Nunzi, J. , Sylla, M. ,

Layer-by-layer (LBL) electrostatic assembly of poly-electrolytes is proving to be an increasingly rich and versatile technique for the formation of multilayered thin films with a wide range of electrical, magnetic, and optical properties. In the present work we synthesized a new nonlinear optical (NLO) maleic acid copolymer containing Disperse Red 1 moieties, built-up multilayer assemblies by a...

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ژورنال: Iranian Journal of Materials Science and Engineering 2004
ARABI H., , MOHAMMAD-SADEGHI B., , RASTEGARI S., ,

In this research, effects of changes in aluminizing conditions on microstructure of Pt - aluminide coating applied oil a Ni - base superalloy GTD -111, has been studied. A thin layer (i.e.68,#mm ) of Pt was electroplated onto the surface of the .samples, and then they were aluminized by pack cementation technique under various conditions of time, temperature, rate of heating and pack powder com...

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Journal: :the modares journal of electrical engineering 2011
mohammad orvatinia reza afzalzadeh faramarz hossein babaei

double layer zno/sno2 thin film resistive gas sensors were fabricated by successive pvd of those oxides onto porcelain substrates. the metallic contacts were provided by electron beam evaporation of platinum onto substrates prior to deposition of the gas sensitive layers. deposits were thermally annealed at different temperatures. it was shown that the activation energy of electrical conduction...

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Journal: :Journal of Nanomaterials 2012

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Journal: :anatomical sciences journal 0
tahereh foroutan mofateh st., tehran, iran aysan farhadi bahram mohammad soltani

introduction: human hematopoietic stem cells (hhscs) have been used for transplantation in hematologic failures. because the number of hhscs per cord blood unit is limited, the expansion of these cells is important for clinical application. it has been reported that cytokines and feeder layer provide a perspective to in vitro expansion of hhscs. in this regard, cord blood cd34+ cells expanded a...

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Journal: Physiology and Pharmacology 1999
Fereshteh Motamedi, Hossein Esteky, Mahmood Salami, Yaghub Fathollahi,

  The effectiveness of θ pattern primed-bursts (PBs) on development of primed-burst (PB) potentiation was investigated in layer II/III of the adult rat visual cortex in vitro. Experiments were carried out in the visual cortical slices. Population excitatory post-synaptic potentials (pEPSPs) were evoked in layer II/III by stimulation of either white mater or layer IV. To induce long-term potenti...

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