检索结果-南通市图书馆

Representation of the spatial association between salinity and water chemical properties in Al-Hassa Oasis

International Journal of Agricultural and Biological Engineering 2020年第2期13卷 168-174页

作者： ibrahim alhawas Abdalhaleem A.Hassaballa Department of Environment&Agricultural Natural Resources College of Agricultural and Food SciencesKing Faisal UniversityKSA

With poor irrigation water quality,cultivation difficulties are certainly expected to *** will cause a severe reduction in crops yield unless a strong strategy is followed to control and sustain high yielding capacity under particular *** salinity presented in the form of water electrical conductivity(EC),has been presented in this study as one of the parameters that significantly participated in decreasing the quality of irrigation water in Al-Hassa oasis at Kingdom of Saudi *** sharing factors in quantifying water EC and its distribution spacewise has been examined by applying the frequency ratio(FR)technique(spatial autocorrelation)between salinity status and water measured elements,specifically,chlorine(Cl^(-)),sodium(Na^(+)),calcium(Ca^(2+)),potassium(K^(+))and magnesium(Mg^(2+)).A threshold salinity value of(EC≥2.0 dS/m)was identified as a break-line for classifying the well-water sources that non-valid for irrigating vegetables grown in the area.A statistical correlation among the examined parameters and EC was conducted using the statistical package for social sciences(SPSS),and compared to the applied FR technique.A dosage of Cl^(-) in irrigation water was observed to be the most significant candidate that raised EC,proved by an R^(2) of 63%.However,the FR technique has shown the validity in analyzing the spatial distribution of water measured variables;in addition to nominating the variable that had the higher association portion,which was assessed to be Na^(+),followed by Cl^(-) with prediction rates of 4.22 and 3.22,respectively.

关键词： statistical correlation GIS water salinity Al-Hassa prediction rate

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Al-Hassa绿洲盐度和水化学性质的空间关联表达

引用

农业工程技术 2020年第24期 86-86页

作者： ibrahim alhawas Abdalhaleem A.Hassaballa Department of Environment & Agricultural Natural Resources College of Agricultural and Food Sciences King Faisal University

灌溉水质量差会增加种植难度,除非在特定情况下采取有效策略来控制和维持高产能力,否则作物产量将会大幅度下降。以水电导率（EC）形式体现的水盐浓度,是显著降低沙特阿拉伯王国Al-Hassa绿洲灌溉水质的参数之一。通过应用频数比（FR）... 详细信息

灌溉水质量差会增加种植难度,除非在特定情况下采取有效策略来控制和维持高产能力,否则作物产量将会大幅度下降。以水电导率（EC）形式体现的水盐浓度,是显著降低沙特阿拉伯王国Al-Hassa绿洲灌溉水质的参数之一。通过应用频数比（FR）技术（空间自相关）测量水的盐度状态与水盐成分,如氯（Cl-）、钠（Na+）、钙(Ca2+)、钾（K+）和镁(Mg2+)的相关性来定量确定水电导率与其空间分布的共享因素。盐度阈值（EC≥2.0 d S/m）被确定为井水水源分类的分界线,该水源对灌溉该地区种植的蔬菜没有实际效果。使用SPSS社会科学统计模块对这些参数和EC之间的统计相关性进行了分析,并与应用FR技术进行比较。据观察,灌溉水中的Cl-剂量是提高EC的最重要成分,63%的R2就是证明。另外,提出了关联性较高的变量（Na+和Cl-的预测率分别为4.22和3.22）,表明了FR技术在分析水测量变量的空间分布方面的有效性。

关键词：统计相关性 GIS 水盐度 Al-Hassa 预测率

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Ballistic resistance and energy dissipation of woven-fabric composite targets:Insights on the effects of projectile shape and obliquity angle

引用

Defence Technology（防务技术） 2023年第3期21卷 14-32页

作者： ibrahim Goda UniversitéBourgogne Franche-Comté FEMTO-ST InstituteDépartement Mécanique Appliquée24 Rue de L’Épitaphe25000BesançonFrance

This study aims at investigating the ballistic resistance and energy absorption in woven E-glass composite panels,considering different projectile nose shapes and oblique incidence *** that scope,three-dimensional finite element(FE)models of both projectiles and the laminated target are developed and numerical investigations are carried out using Abaqus Explicit *** composite damage model’s constitutive law encompasses nonlinear material response,material properties degradation,progressive failure,and an element deletion *** cohesive surface technique is used to represent the interface between two adjacent plies in the laminate,and the traction-separation law is used to characterize the behaviors of interlaminar degradation and *** responses attributable to fiber rupture,matrix cracking,and plasticity caused by micro-matrix cracking due to shear loading are taken into account with suitable damage evolution *** computational framework is first validated against the experimental results reported in the literature by performing ballistic impact tests on the target laminate with conical,hemispherical and blunt-ended projectile,and the numerical results showed a good comparison in terms of residual *** the framework is explored in simulating more complex failure mechanisms,with particular emphasis on the influence of the impact angle of obliquity,a parameter that is not usually analyzed in the *** that regard,the effects of normal and oblique impact on the damage morphologies and ballistic behavior of the fabric composite target in terms of energy absorption,impact contact force,and projectile residual velocity are conducted and analyzed,*** findings showed that the ballistic impact behavior of target composite is substantially influenced by projectile nose shape and incidence angle obliquity.

关键词： resistance cracking composite

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Aging on the Toughness of Austenitic and Duplex Stainless Steel Weldments

引用

Journal of Materials Science & Technology 2010年第9期26卷 810-816页

作者： Omyma Hassan ibrahim ibrahim Soliman ibrahim Tarek Ahmed Fouad Khalifa Metallurgy Dept. Nuclear Research CentreAtomic Energy Authority(Egypt) Nuclear Safety Centre Atomic Energy Authority(Egypt) Shoubra Faculty of Engineering Benha University

In the present study,the effect of aging heat treatment at 650,750,and 850？C on the impact toughness of 316L austenitic stainless steel,2205 duplex stainless steel and their weldments has been *** process was conducted using the TIG（tungsten inert gas） welding *** impact testing,at room temperature,was employed to determine the effect of aging treatment on the impact properties of investigated *** treatment resulted in degradation in the impact toughness as demonstrated by the reduction in the impact fracture energy and deformation parameters（strain hardening capacity,fracture deffection,and crack initiation and propagation energy）.The degree of embrittlement was more noticeable in duplex stainless steel parent and weld-metal than in 316L stainless steel and became greater with the increase of aging *** degradation in impact toughness was discussed in relation to the observed precipitation of the intermetallic sigma phase in the microstructure of the stainless steel weldments and the corresponding fracture surface morphology.

关键词： Austenitic and duplex stainless steels Aging Instrumented impact Toughness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

NEW POLY(METHACRYLATE)S CONTAINING OXIME ESTERS MOIETIES BASED ON CYCLOHEXANON AND CYCLOPENTANON

引用

Chinese Journal of Polymer Science 2008年第4期26卷 443-454页

作者： ibrahim Erol Afyon Kocatepe Universty Faculty of Science and Arts Department of ChemistryAfyonkarahisarTurkey

The synthesis of two new methacrylates such as 2-[(cyclohexylideneamino)oxy]-2-oxoethyl methylacrylate (CHOEMA)and 2-[(cyclopentylideneamino)oxy]-2-oxoethyl methylacrylate(CPOEMA)are *** monomers produced from the reaction of corresponding cyclohexanone O-(2-chloroacetyl)oxime and cyclopentanone O-(2- chloroacetyl)oxime with sodium methacrylate was polymerized in 1,4-dioxane solution at 65℃using AIBN as an initiator. The monomers and their polymers were characterized by IR,~1H- and ^(13)C-NMR spec...

关键词： Methacrylate Oxime esters Activation energy Thermal decompositionv Biological activitiy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Wear Behaviour of Plasma Paste Boronized of AISI 8620 Steel with Borax and B_2O_3 Paste Mixtures

引用

Journal of Materials Science & Technology 2013年第7期29卷 662-668页

作者： ibrahim Gunes Department of Metallurgical and Materials Engineering Faculty of TechnologyAfyon Kocatepe UniversityAfyonkarahisar 03200Turkey

In the present study, AlSl 8620 steel was plasma paste boronized （PPB） by using paste mixtures with different borax and B2O3 percentages. The PPB process was carried out in a DC plasma system at 973, 1023 and 1073 K for 5 h in a gas mixture with 70% H2-30% Ar under a constant pressure of 103 Pa （10 mbar）. The thickness of boride layers ranged from 15.9 to 53.6 tim depending on the temperature and process time. The hardness of the borides formed on the surface of the steel substrate and unborided steel substrate were 1648-1924 HV0.05 and 226 HV0.05, respectively. X-ray diffraction analysis of the boride layers on the surface of the samples were obtained for FeB and Fe2B phases. The wear tests on the steel were performed by using a ball-on-disc test device at room temperature with applied load of 10 N and with a shear velocity of 0.2 m/s. Wear test results showed that the highest value of wear rate was observed in the unborided sample while the lowest wear rate was observed in the PPB samples with 30% borax ＋ 70% B4C paste at 1073 K for 5 h.

关键词： Coating Borax B2O3 Wear Coefficient of friction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recent advances on flexible electrodes for Na-ion batteries and Li–S batteries

引用

Journal of Energy Chemistry 2019年第5期28卷 15-44页

作者： Mohammed-ibrahim Jamesh Department of Physics and Materials Science City University of Hong Kong Applied and Plasma Physics School of Physics (A28) University of Sydney CSIR-Central Electrochemical Research Institute-Chennai Unit CSIR Madras Complex

Flexible energy storage devices are essential for emerging flexible electronics. The existing state-of-the-art Li-ion batteries are slowly reaching their limitation in terms of cost and energy density. Hence, flexible Na-ion batteries (SIBs) with abundanee Na resources and Li-S batteries with high energy density become the alternative for the Li-ion batteries in future. This review summarizes the recent advances in the development of flexible electrode materials for SIBs with metallic matrix and carb on aceous matrix such as carb on nano-tubes, carbon nano-fiber, graphene, carbon cloth, carbon fiber cloth, and cotton textiles. Then, the potential prototype flexible full SIBs are discussed. Further, the recent progress in the development of flexible electrode materials for Li-S batteries based on carb on nano-fiber, carb on nano-tubes, graphene, and cotton textiles is reviewed. Moreover, the design strategies of suitable interlayer, separator, electrolyte, and electrodes to prevent the dissolution and shuttle effect of polysulfides in flexible Li-S batteries are provided. Finally some prospective investigation trends towards future research of flexible SIBs and Li-S batteries are also proposed and discussed. The scientific and engineering knowledge gained on flexible SIBs and Li-S batteries provides conceivable development for practical application in near future.

关键词： Na-ion batteries Lithium-sulfur batteries Flexible Free-standing High performance energy storage Long cycle life

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Super Gaussian enhancers in the Schwinger mechanism

引用

Communications in Theoretical Physics 2020年第1期72卷 81-88页

作者： ibrahim Akal Theory Group DESY 22607 HamburgGermany

We study the Schwinger mechanism in the presence of an additional uniformly oriented,weak super Gaussian of integer order 4 N+*** the worldline approach,we determine the relevant critical points to compute the leading order exponential factor *** show that increasing the parameter N gives rise to a strong dynamical *** N=2,this effect turns out to be larger compared to a weak contribution of the Sauter *** higher orders,specifically,for the rectangular barrier limit,i.e.N→∞,we approach the Lorentzian case as an upper *** the mentioned backgrounds significantly differ in Minkowski spacetime,we show that the found coincidence applies due to identical reflection points in the Euclidean instanton *** addition,we also treat the background in perturbation theory following recent *** doing so,we show that the parameter N determines whether the weak contribution behaves perturbatively or nonperturbatively with respect to the field strength ratio,and,hence,reveals an interesting dependence on the background *** particular,we show that for backgrounds,for which higher orders in the field strength ratio turn out to be relevant,a proposed integral condition is not *** view of these findings,the latter may serve as an indicator for the necessity for higher-order contributions.

关键词： quantum field theory nonperturbative phenomena instantons Schwinger effect semiclassics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Generalized thermoelastic interaction in functional graded material with fractional order three-phase lag heat transfer

引用

Journal of Central South University 2015年第5期22卷 1606-1613页

作者： ibrahim A.Abbas Department of Mathematics Faculty of Science and Arts - Khulais University of Jeddah Nonlinear Analysis and Applied Mathematics Research Group (NAAM) Department of MathematicsKing Abdulaziz University Department of Mathematics Faculty of Science Sohag University

The present work is concerned with the solution of a problem on thermoelastic interactions in a functional graded material due to thermal shock in the context of the fractional order three-phase lag model. The governing equations of fractional order generalized thermoelasticity with three-phase lag model for functionally graded materials(FGM)(i.e., material with spatially varying material properties) are established. The analytical solution in the transform domain is obtained by using the eigenvalue *** inversion of Laplace transform is done numerically. The graphical results indicate that the fractional parameter has significant effects on all the physical quantities. Thus, we can consider the theory of fractional order generalized thermoelasticity an improvement on studying elastic materials.

关键词： three-phase lag model fimctionally graded materials fractional calculus generalized thermoelasticity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Quality of Service Support in RPL Networks:Standing State and Future Prospects

引用

Journal of Computer Science & Technology 2022年第2期37卷 344-368页

作者： ibrahim S.Alsukayti Department of Computer Science College of ComputerQassim UniversityBuraydah 51452Saudi Arabia

The development of IP-based Internet of Things(IoT)networks would facilitate more effective end-to-end IP network architectures,but it remains a *** routing needs to be effectively addressed in the IoT environments of scarce computational and energy ***,the Internet Engineering Task Force(IETF)has specified the IPv6 Routing Protocol for Low Power and Lossy Network(RPL)to provide a bespoke IPv6-based routing framework for IoT ***,RPL comes with no Quality of Service(QoS)support which is an essential requirement for many IoT *** network research community has introduced a number of research proposals enhancing RPL with different QoS *** paper presents a review of these proposed solutions and aims to establish a firm understanding of recent QoS developments for RPL and possible areas for future IoT routing *** focus is on comprehending the protocol and networking properties that can affect QoS performance in RPL *** is also given to different objective functions developed for addressing varying QoS aspects such as throughput,delay,and packet *** is also extended in a number of QoS solutions following different approaches at the MAC,network,and application ***,there is still a need for further developments to address effective QoS support,particularly for dynamic RPL networks.

关键词： Internet of Things low power and lossy network quality of service routing protocol

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：