检索结果-南通市图书馆

Effect of the duty cycle of pulsed current on nanocomposite layers formed by pulsed electrodeposition

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2010年第2期29卷 209-213页

作者： M.Aliofkhazraei sh.Ahangarani A.Sabour Rouhaghdam Department of Materials Engineering Faculty of Engineering Tarbiat Modares University Department of Advanced Materials & Renewable Energies Iranian Research Organization for Science and Technology(IROST)

Nickel-tungsten/carbon nanotube nanocomposite layers with high content and uniform dispersion of carbon nanotubes were fabricated using pulsed electrodeposition *** layers were analyzed by scanning electron microscopy, atomic force microscopy, microhardness, and Tafel polarization *** effect of the duty cycle of pulsed current or concentration of carbon nanotubes in the metallic matrix on electrochemical and mechanical properties of obtained layers has been *** has been shown that both the electrochemical and mechanical properties of nanocomposite layers that formed by pulsed current were improved significantly with respect to un-composed Ni-W *** results were not only concerned by the concentration of carbon nanotubes in the layer but also influenced by the distribution of nanoparticulates in the metallic matrix.

关键词： nanocomposite corrosion nanostructure carbon nanotubes

Monoenergetic electron parameters in a spheroid bubble model

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第2期22卷 347-351页

作者： H.Sattarian sh.Rahmatallahpur T.Tohidi Maraghe Branch Physics DepartmentIslamic Azad UniversityMaraghehIran Bonab Branch Physics DepartmentIslamic Azad UniversityBonabIran Department of Physics Azarbaijan University of Tarbiat MoallemTabrizIran

A reliable analytical expression for the potential of plasma waves with phase velocities near the speed of light is *** presented spheroid cavity model is more consistent than the previous spherical and ellipsoidal models and it explains the mono-energetic electron trajectory more accurately,especially at the relativistic *** maximum energy of electrons is calculated and it is shown that the maximum energy of the spheroid model is less than that of the spherical *** electron energy spectrum is also calculated and it is found that the energy distribution ratio of electrons △E/E for the spheroid model under the conditions reported here is half that of the spherical model and it is in good agreement with the experimental value in the same *** a result,the quasi-mono-energetic electron output beam interacting with the laser plasma can be more appropriately described with this model.

关键词： quasi-mono-energetic electron bunches intense laser plasma accelerator laser wake field bubble regime

Effect of surface nanocrystallization and PPEC time on complex nanocrystalline hard layer fabricated by plasma electrolysis

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2010年第3期20卷 425-431页

作者： M.ALIOFKHAZRAEI sh.AHANGAR ANI A.SABOUR ROUHAGHDAM Department of Materials Engineering Faculty of EngineeringTarbiat Modares University Department of Advanced Materials and Renewable Energies Iranian Research Organization for Science and Technology(IROST)

Size distribution of nano-carbides produced by duplex treatments of surface nanocrystallization(by surface severe plastic deformation) and plasma electrolytic carburizing on CP-Ti was *** and kurtosis of Gussian shape distribution curves were studied and the effect of time was *** usage of longer time is more suitable for achieving less size of complex *** roughness of treated samples was *** is observed that there is an optimum level for time on surface roughness increasing(difference between two measured data).

关键词： surface nanocrystallization hard layer roughness CP-Ti

PROXIMINAL SUBSPACES OF 2-NORMED SPACES

在线全文

学校读者我要写书评

暂无评论

Analysis in Theory and Applications 2006年第2期22卷 114-119页

作者： sh.Rezapour Azarbaidjan University of Tarbiat Moallem Iran

In 1965 Gohler introduced 2-normed spaces and since then, this topic have been intensively studied and developed. We shall introduce the notion of 1-type proximinal subspaces of 2-normed spaces and give some results i... 详细信息

关键词： b-proximinal subspaces 1-type proximinal subspaces 2-functionals

Prediction of operational parameters effect on coal flotation using artificial neural network

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第5期15卷 528-533页

作者： E. Jorjani sh. Mesroghli S. Chehreh Chelgani Department of Mining Engineering Science and Research BranchIslamic Azad University

Artificial neural network procedures were used to predict the combustible value （i.e. 100-Ash） and combustible recovery of coal flotation concentrate in different operational conditions. The pulp density,pH,rotation rate,coal particle size,dosage of collector,frother and conditioner were used as inputs to the network. Feed-forward artificial neural networks with 5-30-2-1 and 7-10-3-1 arrangements were capable to estimate the combustible value and combustible recovery of coal flotation concentrate respectively as the outputs. Quite satisfactory correlations of 1 and 0.91 in training and testing stages for combustible value and of 1 and 0.95 in training and testing stages for combustible recovery prediction were achieved. The proposed neural network models can be used to determine the most advantageous operational conditions for the expected concentrate assay and recovery in the coal flotation process.

关键词： coal flotation operational parameters artificial neural networks combustible recovery

ε-WEAKLY CHEBYshEV SUBSPACES OF BANACH SPACES

在线全文

学校读者我要写书评

暂无评论

Analysis in Theory and Applications 2003年第2期19卷 130-135页

作者： sh.Rezapour Azarbaidjan University of Tarbiat Iran

We will define and characterize ε-weakly Chebyshev subspaces of Banach spaces. We will prove that all closed subspaces of a Banach space X are ε-weakly Chebyshev if and only if X is reflexive.

关键词： ε-quasi Chebyshev subspace ε-weakly Chebyshev subspace

ε-PSEUDO CHEBYshEV AND ε- QUASI CHEBYshEV SUBSPACES OF BANACH SPACES

在线全文

学校读者我要写书评

暂无评论

Analysis in Theory and Applications 2004年第4期20卷 350-357页

作者： sh. Rezapour Department of Mathematics Azarbaidjan University of Tarbiat Moallem Tabriz 51745-406 Iran

We will define and characterize ε-pseudo Chebyshev and ε-quasi Chebyshev subspaces of Banach spaces. We will prove that a closed subspace W is ε-pseudo Chebyshev if and only if W is ε-quasi Chebyshev.

关键词： ε-pseudo Chebyshev subspace ε-quasi Chebyshev subspace

Effects of solution treatment on high temperature deformation behavior of extruded Mg-0.35Y-2.17Nd-0.36Zr biomedical alloy

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2019年第9期29卷 1842-1853页

作者： sh.ALIYARI S.M.FATEMI S.M.MIRESMAEILI Department of Metallurgy and Materials Engineering Shahid Rajaee Teacher Training University

The high temperature deformation behavior of an extruded Mg-0.35 Y-2.17 Nd-0.36 Zr(wt.%) alloy was investigated for biomedical application by employing compression tests in temperature range of 225-525 ℃ and strain rate range of 0.0003-0.03 s-1. To study the significance of solute elements, the material was solution-treated before deformation. The low temperature yield strength of the as-extruded material significantly decreased after solutionizing process. A drastic change in the strength of solutionized alloy was recorded as the temperature was raised to 450 ℃, which was attributed to the promotion of grain boundary sliding(GBS). It was evidently shown that the slip-to-twinning transition temperature did not necessarily coincide with the strength-drop temperature. Based on constitutive equations, deformation parameters and related activation energy for the experimental alloy have been determined, incorporating the strain-dependent material constants. The verification of predictability of the developed models indicates a good agreement between experimental and predicted data.

关键词： Mg alloy hot deformation constitutive model twinning

Preliminary study on search for genes for early embryonic development in goldfish by mRNA differential display

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第13期42卷 1133-1135页

作者： Li, sh Han, W Ma, HF Institute of Developmental Biology Chinese Academy of Sciences Beijing 100080 China

MATERNAL RNAs stored in eggs play an essential role during the initial stage of embryonic de-velopment in animals and they are degraded as the development proceeds. In some animals (e.g. fish and amphibian), zygotic genes begin to transcribe new mRNA only when the embryosdevelop to about midblastula stage. This degradation of maternal RNA and synthesis of

关键词： mRNA differential display early embryonic development gene goldfish.