检索结果-南通市图书馆

The necessity to expand mycorrhizal boundaries:Including the fungal endophytes that possess key mycorrhizal criteria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2024年第2期34卷 520-523页

作者： khalil KARIMAN Zed RENGEL Rodica PENA saleh RAHIMLOU Mark TIBBETT UWA School of Agriculture and Environment The University of Western AustraliaPerth WA 6009Australia Department of Sustainable Land Management&Soil Research Centre School of AgriculturePolicy and DevelopmentUniversity of ReadingReading RG66ARUK Department of Ecology and Evolutionary Biology University of MichiganAnn Arbor MI 48109USA

Dear editor,This letter aims to urge the necessity to expand the boundaries of mycorrhizal symbiosis to include certain root fungal *** conventional classification of mycorrhizal associations emphasizes specialized fu... 详细信息

关键词： editor specialized interface

Black Holes in the Light of Field Theory and Quantum Mechanics

在线全文

学校读者我要写书评

暂无评论

Journal of High Energy Physics, Gravitation and Cosmology 2019年第3期5卷 612-622页

作者： Ahmad Tarhini khalil Abou-saleh Physics Department Faculty of Sciences Lebanese University Nabatieh Lebanon

The black hole is a region in space where things may fall into it but nothing can come out. We present a study of the physics of a black hole using a quantum field theory frame based on the WZW model in a suitable mathematical frame. Based on the Schwarzschild metric, we show the different regions of our universe with the present singularities. Then we introduce the calculation of a black hole mass using the perturbation theory. We further discuss Hawking radiation and its quantum mechanical implications. At some limits, the space time can represent a black hole with a singularity hidden by the horizon.

关键词： Black Holes Field Theory Schwarzschild Solution Hawking Radiation

Solving Diffusion Time in Heterogeneous Microscale Rock Matrix by 3D Computations: Non-Fickian Dispersion Observed in Porous Media

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2019年第12期7卷 42-52页

作者： khalil Abou-saleh Jalal Dweik Youssef Haidar Abbas Ghaddar Department of Physics Faculty of Sciences V Lebanese University Nabatieh Lebanon

Understanding and simulating the underlying microscopic physics of the rock matrix is very useful for determining macroscopic physical properties such as permeability. Matrix diffusion is an important transport parameter controlling the late-time behaviour of breakthrough curves (BTCs). We compute the memory function, implemented in the sink/source term of Mobile-immobile mass transfer by solving the matrix diffusion using a time diffusion random-walk approach. The diffusion is controlled by different parameters like the porosity, tortuosity, mobile-immobile interface and immobile domain cluster shapes. All these properties are investigated by X-ray microtomography that captures the main characteristics of matrix diffusion at three dimensions. We compare the memory function deduced from the field-scale tracer tests well with the computed memory function. Simulation results of the memory function appeared to be coherent with that measured from the tracer test for a large tortuosity value. Probably, the diffusion paths are longer, and they are controlled by the properties mentioned above. From a representative elementary volume of natural reservoirs studied here, we conclude that, microscale diffusion process in the immobile domain play a crucial role to better understand the non-Fickian dispersion measured from the tracer test.

关键词： Matrix Diffusion Time Domain Random Walk Memory Function Mobile-Immobile Mass Transfer

CFRP加固方形截面RC构件在不等跨横向冲击作用下动力响应研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CFRP加固方形截面RC构件在不等跨横向冲击作用下动力响应研究

作者： khalil MOHAMMED saleh ALI AL-BUKHAITI 西南交通大学

学位级别：硕士

建筑结构常由于损伤、规范要求、功能改变等原因,需要进行加固;碳纤维聚合物（CFRP）由于强度高、质量轻、耐腐蚀性好、易于施工等优点,广泛应用于结构加固中。以经过CFRP材料加固的典型方形截面钢筋混凝土框架柱为研究对象,针对交通工... 详细信息

建筑结构常由于损伤、规范要求、功能改变等原因,需要进行加固;碳纤维聚合物（CFRP）由于强度高、质量轻、耐腐蚀性好、易于施工等优点,广泛应用于结构加固中。以经过CFRP材料加固的典型方形截面钢筋混凝土框架柱为研究对象,针对交通工具撞击作用,探讨CFRP对钢筋混凝土柱不等跨撞击作用下的动力响应,本文主要研究内容和结果如下:（1）通过试验研究,探讨CFRP材料包裹层数（1层,6层）、包裹方式（横向,纵向）等因素对撞击作用下构件动力响应性能的影响,试验研究表明:试验构件均为受弯破坏模式,冲击点处和近冲击点支座处是破坏严重区域;横向包裹的构件断裂更为突然,对纵向包裹构件,包裹层数提高可有效减少破坏程度。（2）对试验中获得的冲击力时程曲线、挠度时程曲线和应变时程曲线分析表明包裹方式、层数对冲击力峰值影响较小;纵向包裹的构件、平台段持时更长,横向包裹平台段波动大;纵向包裹层数的增大,可增大平台值。包裹层数越大,撞击产生的挠度越小,纵向包裹能够有效传递受力。（3）基于本文试验和已有试验结果,提出采用短期抗弯刚度Bs来表征CFRP加固的RC混凝土结构柱的防撞能力。基于他人推导,提出CFRP加固RC结构柱Bs计算的表达式,将本文理论计算结果和已有试验结果进行比较,验证了公式的适用性。（4）建立了有限元模型,并将有限元分析结果与试验结果进行比较,验证了有限元模型的正确性;基于有限元分析,分析了冲击速度、砼强度、纵向钢筋配筋率、CFRP层数对构件抗冲击性能的影响,提出了CFRP加固层数最优值。

关键词： CFRP-RC构件不等跨横向撞击破坏模式包裹方式 CFRP层数短期抗弯刚度Bs

Development of C/S and B/S E-Commerce System ——Case Study of Object-Oriented Analysis & Design

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Development of C/S and B/S E-Commerce System ——Case Study ...

作者： khalil Ahmed saleh Al-Mekhlafi（哈里力）东北师范大学

学位级别：硕士

With the development of Internet technology, methods, and tools of the development of information systems, especially in electronic commerce field, leads to make theoretical and practical studies for developing electronic commerce systems. Since Yemen is a developing country, we have to pay a great deal of attention to the great role that the Internet plays in the world of business. This thesis presents study of the state of development information systems in Yemen especially in E-Commerce information systems, also focusing on the methods and tools which were used in the developing information systems in Yemen, and the rate of using Object-Oriented Software Engineering in the universities and software companies of Yemen through developing information systems. The study showed that about 95% of information systems in Yemen were developed by using traditional software engineering, only about 5% of information systems were developed by using Object-Oriented software engineering. Since Yemeni government is moving towards E-Commerce & E-Government and Based on the above results, this thesis also presents case study of developing electronic commerce information system of Online Bookstore System (OBS) for sales the books through the Internet.On one hand , the Online Bookstore System has been developed by using the Object-Oriented technology as software engineering methodology based on Coad & Yourdon method for Object-Oriented Analysis model which has five layers and Object-Oriented Design model which has four components, because the Coad & Yourdon method is easy to study and apply. The case study can be seen as 3-Tier Architecture E-Commerce System which has become popular today. On the other hand, every developer, programmer, and who interested in developing information systems especially in electronic commerce systems and software engineering can make use of such kind of this thesis.

关键词： Object-Oriented Analysis Object-Oriented Design E-Commerce C/S Structure B/S Structure

Molecular Simulation of Ion Transport at the Water/Vapor Interface

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Open Journal of Physical Chemistry 2012年第3期2卷 147-155页

作者： Jalal Dweik Mahmoud Srour Khaled Karaky Marwan Kobeissi Wissam Joumaa khalil Abou-saleh Département de Physique et Chimie Faculté des Sciences Université Libanaise Nabatieh Liban Institut Européen des Membranes CNRS UMR 5635 Université Montpellier II ENSCM Montpellier France Laboratoire de Physiotoxcicité Environnementale EDST017 Faculté des Sciences Université Libanaise Nabatieh Liban

Molecular dynamics was used to quantify the role of the size, charge and polarisability of F–, Cl–, Br–, I– and Na+ ions in their distribution in the water/vapour interface system. Our results show that the larger polarizable anions I– and Br– is attracted to the surface which is traced back to surface-modified ion hydration, while the F– was repelled from the interface and the Cl– occupied the total volume of the water slab. Moreover, by artificially increasing the ions charge, anions were localized to the center of the water slab. These results demonstrate that the effect of polarizability cannot be neglected in the transport mechanism.

关键词： Molecular Dynamics Ions Interface Interaction potentials Solvation Polarization

Study of Sintering Behaviour and Electrical Conductivity of Cr-Zn-Fe-O System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1999年第1期15卷 79-82页

作者： Hanna, A.A. khalil, M.Sh. saleh, H.I. Ali, A.F. Inorganic Chemistry Department National Research Centre Dokki Cairo Egypt

A series of chemical composition based on Cr, Fe and O with Zn as a partially substituting ion has been prepared in the general formula Zn//xCr//1// minus //xFe//2O by coprecipitation method using NH//4OH as the precipitating agent at pH equals 10.3. The prepared samples were identified by both thermal analysis (DTA and TGA) and X-ray diffraction. It was found that no single phase is obtained for any of the studied compositions but a mixture of different phases is observed, depending on the molar percentage of zinc ion substitution as well as on the sintering temperature. The temperature dependence of the electrical conductivity, sigma , of the prepared samples is plotted between 25 and 680 degree C. It was observed that the electrical conductivity increases with temperature for both samples with x equals 0.00 and 0.80 Zn ion content while it is nearly temperature independent for samples with intermediate Zn concentration x equals 0.2 and 0.5 mol fraction. The activation energy, E//a, calculated from the linear relation, lg sigma -1000/T for the final mixtures (sintered at 1300 degree C) was calculated. (Edited author abstract) 16 Refs.

关键词： Chromium compounds

Efficacy of Gold Nanoparticles against Nephrotoxicity Induced by Schistosoma mansoni Infection in Mice

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2016年第11期29卷 773-781页

作者： Mohamed A Dkhil Mona F khalil2 Amira A Bauom Marwa SM Dia saleh A1-Qura Department of Zoology College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Zoology and Entomology Faculty of ScienceHelwan UniversityCairo 11795Egypt Department of Laboratory Sciences College of Science&ArtsA1-RassQassim UniversityAL-Qaseam 51921Saudi Arabia Molecular Drug Evaluation Department National Organization for Drug Control&Research(NODCAR)Giza 12553Egypt

Objective In this study, the ameliorative effects of gold nanoparticles （gold NP） on the renal tissue damage in Schistosoma mansoni （S. mansoni）-infected mice was investigated. Methods High-resolution transmission electron microscopy was used for the characterization of NP. The gold NP at concentrations of 250, 500, and 1000 μg/kg body weight were inoculated into 5. mansoni-infected mice. Results The parasite caused alterations in the histological architecture. Furthermore, it induced a significant reduction in the renal glutathione levels; however, the levels of nitric oxide and malondialdehyde were significantly elevated. The parasite also managed to downregulate KIM-I, NGAL, MCP-1, and TGF-8 mRNA expression in infected animals. Notably, gold NP treatment in mice reduced the extent of histological impairment and renal oxidative damage. Gold NP were able to regulate gene expression impaired by 5. Mansoni infection. Conclusion The curative effect of gold NP against renal toxicity in 5. mansoni-infected mice is associated with their role as free radical scavengers.

关键词： Gold nanoparticles Schistosomiasis Renal damage Gene expression Histopathology Oxidative stress

Preparation and Characterization of Some Ferrites from CuO-ZnO-Fe_2O_3 Mixtures

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1998年第3期14卷 236-240页

作者： A.A.Hanna H.I saleh and M.Sh.khalil(Inorg. Chem. Dept., National Research Centre, Dokki, Cairo, Egypt) Inorg. Chem. Dept. National Research Centre Dokki Cairo Egypt

The ferrites of Cuo-ZnO-Fe2o3 solid solution series near the molar ratio of ZnxCu1-x were prepared by direct heating of their coprecipitated hydroxides using NH4OH as precipitating agent where x=0.0, 0.2, 0.5, 0.8 and 1.0. Additional amounts of Cu and Zn sulphates were added to compensate the loss during the coprecipitation of the hydroxides. The ferritized samples were characterized by chemical analysis, XRD. DTA, TGA and SEM. XRD of both Zn0.2Cu0.8Fe2O4 and Zn0.5Cu0.5 Fe2O4 that indicates the formation of a heterogeneous ferrite material of ZnFe2O4 and CuFe2O4 mixed with variable amounts of α-Fe2O3. Zn and Cu ferrites were observed only in *** TGA-time relation, the activation energy of the different transformation phases were calculated. It is found that, the activation energy of ZnFe2O4 is slightly equal to 3/2 of that for CuFe2O4. Dielectric measurements show that the electrical behaviour depends on the ordering and disordering of the phases.

关键词： CuO ZnO Fe Preparation and Characterization of Some Ferrites from CuO-ZnO-Fe2O3 Mixtures