检索结果-南通市图书馆

Zebrafish as a possible bioindicator of organic pollutants with effects on reproduction in drinking waters

Journal of Environmental sciences 2015年第7期27卷 254-260页

作者： M.Martínez-sales f.García-Ximénez f.J.Espinós Aquaculture and Environmental Research Group (ACUMA) Polytechnic University of Valencia

Organic contaminants can be detected at low concentrations in drinking water, raising concerns for human health, particularly in reproduction. In this respect, we attempted to use the zebrafish as a bioindicator to detect the possible presence of these substances in drinking water, aiming to define the most relevant parameters to detect these substances, which particularly affect the development and reproduction of zebrafish. To this end, batches of30 embryos with the chorion intact were cultured in drinking waters from different sources,throughout their full life-cycle up to 5 months, in 20 L tanks. six replicates were performed in all water groups, with a total of 24 aquariums. Two generations（f0 and f1） were studied and the following parameters were tested： in the f0 generation, survival and abnormality rates evaluated at 5 dpf（days post-fertilization） and at 5 mpf（months post-fertilization）,the onset of spawning and the fertility rate from 3 mpf to 5 mpf, and the sex ratio and underdeveloped specimens at 5 mpf. furthermore, in the f0 offspring（f1）, survival and abnormality rates were evaluated at 5 dpf and the hatching rate at 72 hpf. These results revealed that the hatching rate is the most sensitive parameter to distinguish different levels of effects between waters during the early life stages, whereas the rate of underdeveloped specimens is more suitable at later life stages. Regarding adult reproduction, fertility rate was the most sensitive parameter. The possible reversibility or accumulative nature of such effects will be studied in future work.

关键词： Organic pollutants Bioindicator Development and reproduction parameters Drinking water Zebrafish

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

Efective Parameters on Energy Losses of fast Electron in fusion Mediums

引用

Communications in Theoretical Physics 2013年第10期60卷 491-495页

作者： M.Mahdavi s.f.Ghazizadeh Physics Department Mazandaran University Physics Department Tehran Payam-e-Noor University

The stopping and scattering of fast electrons in a dense plasma relevant to inertial confinement fusion （ICf） are investigated numerically with the latest improved cross section equations. Binary and collective effects are considered to determine beam transport parameters such as range, penetration depth, spreading processes as straggling and blooming versus electron energy and plasma parameters. Blooming and straggling effects, which act as consequences of scattering with statistical assumption in collisions, lead to a non-uniform, extended region of energy deposition. finally the mean angle of deflections is calculated for different plasma energies.

关键词： scattering stopping power ICf binary collisions collective effect straggling blooming

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

MgO-attached graphene nanosheet(MgO@GNs)reinforced magnesium matrix nanocomposite with superior mechanical,corrosion and biological performance

引用

International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2062-2076页

作者： s.Abazari A.shamsipur H.R.Bakhsheshi-Rad M.s.soheilirad f.Khorashadizade s.s.Mirhosseini Department of Materials and Metallurgical Engineering Amirkabir University of TechnologyTehran ***Iran Iranian National standards Organization of Hormozgan HormozganIran Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Materials and Metallurgical Engineering Iran University of Science and TechnologyTehranIran

Magnesium(Mg)alloys are gaining great consideration as body implant materials due to their high biodegradability and ***,they suffer from low corrosion resistance and antibacterial *** this research,semi-powder metallurgy followed by hot extrusion was utilized to produce the magnesium oxide@graphene nanosheets/magnesium(MgO@GNs/Mg)composite to improve mechanical,corrosion and cytocompatibility *** have revealed that the incorporation of MgO@GNs nanohybrids into Mg-based composite enhanced microhardness and compressive *** vitro,osteoblast cell culture tests show that using MgO@GNs nanohybrid fillers enhances osteoblast adhesion and apatite *** presence of MgO@GNs nanoparticles in the composites decreased the opening defects,micro-cracks and micro-pores of the composites thus preventing the penetration of the corrosive solution into the *** demonstrated that the MgO@GNs/Mg composite possesses excellent antibacterial properties because of the combination of the release of MgO and physical damage to bacterium membranes caused by the sharp edges of graphene nanosheets that can effectively damage the cell wall thereby facilitating penetration into the bacterial lipid ***,the MgO@GNs/Mg composite with high mechanical strength,antibacterial activity and corrosion resistance is considered to be a promising material for load-bearing implant applications.

关键词： metal matrix composites MgO@GNs nanohybrid strengthening mechanisms antibacterial activity biocompatibility

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

A non-relativistic model for the[cc]■ tetraquark

引用

Chinese Physics C 2019年第1期43卷 36-55页

作者： V.R.Debastiani f.s.Navarra Departamento de física Teórica and IfIC Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna Instituto de física Universidade de Sa?o Paulo Institut de Physique Théorique Université Paris SaclayCEA CNRS

We use a non-relativistic model to study the spectroscopy of a tetraquark composed of [cc]■ in a diquark-antidiquark *** numerically solving the schr?dinger equation with a Cornell-inspired potential,we separate the four-body problem into three two-body ***-dependent terms(spin-spin,spin-orbit and tensor)are used to describe the splitting structure of the ■ spectrum and are also extended to the interaction between *** experimental data on charmonium states are used to fix the parameters of the model and a satisfactory description of the spectrum is *** find that the spin-dependent interaction is sizable in the diquark-antidiquark system,despite the heavy diquark mass,and also that the diquark has a finite size if treated in the same way as the ■ *** find that the lowest s-wave T 4c tetraquarks might be below their thresholds of spontaneous dissociation into low-lying charmonium pairs,while orbital and radial excitations would be mostly above the corresponding charmonium pair ***,we repeat the calculations without the confining part of the potential and obtain bound diquarks and bound *** might be relevant to the study of exotic charmonium in the quark-gluon *** T 4c states could be investigated in the forthcoming experiments at the LHC and BelleⅡ.

关键词： tetraquark charmonium diquark-antidiquark nonrelativistic spin

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

strain Hardening and strain Rate sensitivity Behaviors of Advanced High strength steels

引用

Journal of Iron and steel Research International 2013年第6期20卷 68-74页

作者： f Ozturk A Polat s Toros R C Picu Department of Mechanical Engineering Nigde University Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic InstituteTroy 12180 New York USA

The mechanical properties of commercial dual phase （DP）, transformation induced plasticity （TRIP）, and high strength low alloy （HsLA-340） steel sheets are investigated and compared at various strain rates ranging from 0.001 7to 0.17 s-1 at ambient *** steel outperforms the other two materials , having comparable ductility and twice as large strength relative to DP *** has larger strength and much larger ductility than *** exceuent ductility of TRIP800is due to its high strain hardening capability , which promotes stable plastic *** is observed that the strain hardening rate in TRIP800does not decrease to zero at failure , as common in most materials in which failure is preceded by necking.

关键词： steel advanced high strength steel HsLA DP TRIP hardening

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

Plane Vibrations in a Transversely Isotropic Infinite Hollow Cylinder Under Effect of the Rotation and Magnetic field

引用

Computer Modeling in Engineering & sciences 2017年第2期113卷 151-170页

作者： f.s.Bayones A.M.Abd-Alla Math.Dept. Faculty of ScienceTaif UniversitySaudi Arabia Mathematics Department Faculty of ScienceSohagEgypt

The aim of this paper is to study the effects of rotation and magnetic field on the plane vibrations in a transversely isotropic material of an infinite hollow *** natural frequency of the plane vibrations in the case of harmonic vibrations has been *** natural frequencies are calculated numerically and the effects of rotation and magnetic field are *** numerical results obtained have been illustrated graphically to understand the behavior of frequency equation with different values of frequencyωunder effects the rotation and magnetic *** was made with the results obtained in the presence and absence of the rotation and magnetic *** results indicate that the effect of rotation and magnetic field are very pronounced.

关键词： Plane transversely isotropic rotating magnetic field homogeneous transversely isotropic Natural frequencies

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

friction and wear properties of nano-si3N4/nano-siC composite under nanolubricated conditions

引用

Journal of Advanced Ceramics 2016年第2期5卷 145-152页

作者： M.s.CHAROO M.f.WANI Centre for Tribology Mechanical Engineering Department National Institute of Technology Srinagar(J&K) 190006 India

friction and wear properties of nano-si3N4/nano-siC composite were studied under nanolubricated conditions. Mineral oil mixed with nanoparticles of diamond was used as lubricant. A friction coefficient of 0.043 and a ... 详细信息

friction and wear properties of nano-sisub>3sub>Nsub>4sub>/nano-siC composite were studied under nanolubricated conditions. Mineral oil mixed with nanoparticles of diamond was used as lubricant. A friction coefficient of 0.043 and a wear coefficient of 4.2×10sup>-7sup> were obtained for nano-sisub>3sub>Nsub>4sub>/nano-siC composite under normal load of 600 N with mineral oil + 0.5 wt% nanodiamond, whereas a friction coefficient of 0.077 and a wear coefficient of 10.3×10sup>-7sup> were obtained for nano-sisub>3sub>Nsub>4sub>/nano-siC composite under normal load of 600 N with mineral oil. 3D surface profilometer was used to study the surface morphology of wear scars. scanning electron microscopy (sEM) and X-ray diffraction (XRD) studies were conducted to illustrate reduction in friction and wear.

关键词： nano-ceramics nanolubrication nano-si3N4/nano-siC friction wear

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

Direct Torque Control strategy of an Induction-Machine-Based flywheel Energy storage system Associated to a Variable-speed Wind Generator

引用

Energy and Power Engineering 2012年第4期4卷 255-263页

作者： M. mansour s. Rachdi M. N. mansouri M. f. Mimouni Unité de Recherche étude des systèmes Industriels et énergies Renouvelables – EsIERécole Nationale d’Ingénieurs de Monastir Avenue Ibn El Jazzar 5019 Monastir Tunisie

The flywheel energy storage systems (fEsss) are suitable for improving the quality of the electric power delivered by the wind generators and for helping these generators to contribute to the ancillary services. Presently, fEsss containing a flux-oriented controlled (fOC) induction machine (IM) are mainly considered for this kind of application. This paper proposes the direct torque control (DTC) for an IM-based fEss associated to a variable speed wind generator (VsWG), and proves through simulation results that it could be a better alternative.

关键词： VsWG fEss IM DTC DC Bus Voltage Control Power flow

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

Effects of TIG surface Melting and Chromium surface Alloying on Microstructure, Hardness and Wear Resistance of ADI

引用

Journal of Iron and steel Research International 2008年第4期15卷 86-94页

作者： A Amirsadeghi M Heydarzadeh sohi s f Kashani Bozorg school of Metallurgy and Materials Engineering University of Tehran Tehran Iran

Microhardness and wear resistance of different rnicrostructures formed by TIG （tungsten inert gas） surface melting and chromium surface alloying （using ferrochromium） of ADI （austempered ductile iron） were studied. surface melting resulted in the formation of a ledeburitic structure in the melted zone, and this structure has a hardness up to 896 HV as compared to 360 HV in that of ADI. Moreover, chromium surface alloying resulted in the formation of different structures including：（1） a hypereutectic structure consisting of primary （fe,Cr）7C3 carbides and a eutectic matrix of transformed austenite （into martensite and retained austenite）, as also （fe,Cr）7C3 carbides, with a hardness of 1078 HV; （2） a hypoeutectic structure consisting of the same eutectic along with transformed primary austenite, with a hardness of 755 HV; and （3） a ledeburitic structure with an acicular morphology and a hardness of 896 HV. The results also indicated that surface melting reduced the wear rate of the ADI by approximately 37%. Also, chromium surface alloying yielded a superior wear behavior and reduced the wear rate of the treated specimens by about 38% and 70%, depending on the structures formed.

关键词： ductile iron surface alloying surface melting chromium wear resistance

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 ELECTROLEss DEPOsITION CONDITIONs ON THE sTRUCTUREs AND THE MAGNETIC PERfORMANCEs Of THE Co-fe-P ALLOY

引用

Acta Metallurgica sinica(English Letters) 2006年第4期19卷 307-312页

作者： s.L. Wang f.Q. Zeng Department of Applied Chemistry College of Materials Science and Engineering Huaqiao University Quanzhou 362021 China

Electroless Co-fe-P alloys were deposited from an alkaline bath, containing boric acid as a buffer agent and sodium citrate as a complexing agent. As a result, with the increase of pH of the bath, the iron content of the deposit increased, whereas the cobalt and phosphorus contents decreased. The structure of the deposit was investigated using X-ray diffraction （XRD） and transmission electron microscope （TEM）. The deposit consisted of hexahedron phase Co, cubic phase fe-Co, and amorphous phase （crystalline）. The magnetic performances of the deposit were studied using vibrating sample magnetometer （VsM）. The more the content of fe and the less the content of P （the content of Co being less）, the better the magnetic performances of the deposit. The Co-fe-P deposit was suitable for use as soft magnetic material.

关键词： electroless deposition Co-fe-P structure magnetic performance

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

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：