检索结果-南通市图书馆

Evaluation of groundwater quality using pollution index of groundwater(PIG) and non-carcinogenic health risk assessment in part of the Gangetic basin

引用

Acta Geochimica 2021年第3期40卷 419-440页

作者： Apoorv Verma n.b.Singh Environmental Science and Engineering Civil Engineering DepartmentInstitute of Engineering and TechnologyDr.A.P.J.Abdul Kalam Technical UniversityLucknow 226021India Harcourt butler Technical University Kanpur 208002India

The aim of this study was to evaluate groundwater fitness for domestic and irrigational use in Unnao district of Uttar Pradesh,*** this study,block wise(n=16)groundwater samples were collected,and measured parameters were analyzed using the pollution index of groundwater(PIG),various irrigational indices,and graphical *** results of this study suggested that most of the parameters were within the prescribed limits of WHO and bIS,excluding F-(0.4 to 2.6 mg L^(-1))and Fe^(2+)(0.1 to 1.7 mg L^(-1)).Concentrations of total dissolved solids(TDS)were exceeded the desirable limit(>500 mg L^(-1))in 43.75%of samples at some *** Gibbs plot revealed that groundwater chemistry was governed by rock-water interaction in the region,especially silicate *** Piper plot suggested that Ca^(2+)-HCO3-is dominant hydrochemical facies in the area followed by mixed Ca^(2+)-na^(+)-HCO_(3)^(-)type,na^(+)-Cl^(-)type,and na^(+)-HCO_(3)^(-)*** evaluation revealed that the contribution of F-and Fe2+in groundwater degradation is high in comparison to other elements in the region,about 18.75%samples showed low pollution,while about 6.25%samples shows moderate pollution,and 6.25%samples reflected high *** human health risk(HHR)assessment finding suggested that children(mean:1.36)are more vulnerable than adults(mean:1.01).Sodium absorption ration(SAR),Residual sodium carbonate(RSC),and Permeability index(PI)indicated that most of the groundwater was suitable for irrigation,whereas,Magnesium hazard ration(MHR)and Potential salinity(PS)indices suggested that only 37.5%and 56.25%of the samples were suitable for irrigational use,*** regional study would help in decision making for stakeholders and relevant authorities in the execution of groundwater management and remediation plans in the area.

关键词： Groundwater Pollution index of groundwater Irrigational indices Silicate weathering Human health risk

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

Instantaneous frequency and wave mode identification in a magnetosheath using few spatial points

引用

Chinese Physics b 2013年第8期22卷 496-501页

作者： nathaniel E U beloff n George n j Department of Physics Akwa Ibom State UniversityNigeria University of Sussex Brighton UK

Observational data such as those obtained from the magnetosheath in the downstream of Earth＇s bow shock have waveforms that differ from those of sinusoidal signals. In practice, they are not even aggregates of sinusoidal signals. Therefore, the frequency decomposition for the data requires technique that will account for the time-varying features of the data that will lead to deduction of physical meaning of the observations. The combination of empirical mode decompo- sition （EMD） and Hilbert transform has been used for extracting the various contributing oscillatory modes （EMDs） and the instantaneous frequency determination （Hilbert transform） of every physically meaningful mode called intrinsic mode func- tion （IMF）. The resulting instantaneous frequencies are used to determine instantaneous wave vectors. The combination of the instantaneous frequencies and wave vectors is useful in the identification of wave modes based on the characteristics of the waves. The results show that EMD-Hilbert can be more reliable than simple Hilbert transform alone.

关键词： EMD-Hilbert transform instantaneous frequency and wave vector

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

RECOGnITIOn OF ESSEnTIALLY DISCOnnECTED bEnZEnOIDS

引用

Acta Mathematicae Applicatae Sinica 1992年第4期8卷 377-382页

作者：陈荣斯 S.j.CYVIn b.n.CYVIn College of Finance and Economics Fuzhou University Fuzhou 350002 China The University of Trondheim Norway The University of Trondheim Norway benzenoid or a benzenoid system is a connected planar graph whose every interiorface is a regular hexagon. A peak (resp. valley) of a benzenoid is a vertex which lies above(resp. below) all its first neighbors. A Kekulean benzenoid is a benzenoid with at least oneperfect matching. An essentially disconnected benzenoid is a Kekulean benzenoid which hassome fixed bonds. Essentially disconnected benzenoids have proved to be very useful incertain enumeration techniques for Derfect matching. Hence the problem of recognizing

A benzenoid, or a benzenoid system, is a connected planar graph whose every interiorface is a regular hexagon. A peak (resp. valley) of a benzenoid is a vertex which lies above(resp. below) all its first neighbors. A Kekulean benzenoid is a benzenoid with at least oneperfect matching. An essentially disconnected benzenoid is a Kekulean benzenoid which hassome fixed bonds. Essentially disconnected benzenoids have proved to be very useful incertain enumeration techniques for Derfect matching. Hence the problem of recognizing

关键词： RECOGnITIOn OF ESSEnTIALLY DISCOnnECTED bEnZEnOIDS

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

numerical solution of thermo-solutal mixed convective slip flow from a radiative plate with convective boundary condition

引用

journal of Hydrodynamics 2016年第3期28卷 451-461页

作者： m.j.uddin o.anwar bég m.n.uddin a.i.md.ismail Department of Mathematics American International University-BangladeshDhakaBangladesh Fluid Mechanics Spray Research GroupPetroleum and Gas Engineering DivisionRoom G77Newton BuildingSchool of ComputingScience and Engineering(CSE)University of SalfordM54WTUK Department of Mathematical Sciences Ball State University2000 W University AvenueMuncieIN 47306USA School of Mathematical Sciences Universiti Sains MalaysiaPenang 11800Malaysia

A mathematical model for mixed convective slip flow with heat and mass transfer in the presence of thermal radiation is presented. A convective boundary condition is included and slip is simulated via the hydrodynamic slip parameter. Heat generation and absorption effects are also incorporated. The Rosseland diffusion flux model is employed. The governing partial differential conservation equations are reduced to a system of coupled, ordinary differential equations via Lie group theory method. The resulting coupled equations are solved using shooting method. The influences of the emerging parameters on dimensionless velocity, tempera- ture and concentration distributions are investigated. Increasing radiative-conductive parameter accelerates the boundary layer flow and increases temperature whereas it depresses concentration. An elevation in convection-conduction parameter also accelerates the flow and temperatures whereas it reduces concentrations. Velocity near the wall is considerably boosted with increasing momentum slip parameter although both temperature and concentration boundary layer thicknesses are decreased. The presence of a heat source is found to increase momentum and thermal boundary layer thicknesses but reduces concentration boundary layer thickness. Excelle- nt correlation of the numerical solutions with previous non-slip studies is demonstrated. The current study has applications in bio- reactor diffusion flows and high-temperature chemical materials processing systems.

关键词： slip flow thermal radiation lie group theory heat source/sink materials processing

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

Identification of four novel DC-SIGn ligands on Mycobacterium bovis bCG

引用

Protein & Cell 2010年第9期1卷 859-870页

作者： Maria V.Carroll robert b.Sim Fabiana bigi Anne jäkel Robin Antrobus Daniel A.Mitchell Department of Pharmacology University of OxfordMansfield RoadOxford OX13QTUK Institute of biotechnology CICVyA-INTALos Reseros y Las Cabañas1712 CastelarArgentina Cambridge Institute of Medical Research Addenbrooke’s HospitalHills RoadCambridge CB20XYUK CSRI-UHCW Walsgrave Campus University of WarwickCoventryCV22DXUK

Dendritic-cell-specific intercellular adhesion molecule-3-grabbing non-integrin(DC-SIGn;CD209)has an important role in mediating adherence of Mycobacteria species,including *** and *** bCG to human dendritic cells and macrophages,in which these bacteria can survive ***-SIGn is a C-type lectin,and interactions with mycobacterial cells are believed to occur via mannosylated structures on the mycobacterial *** studies suggest more varied modes of binding to multiple mycobacterial *** we identify,by affinity chromatography and mass-spectrometry,four novel ligands of *** bCG that bind to *** novel ligands are chaperone protein DnaK,60 kDa chaperonin-1(Cpn60.1),glyceraldehyde-3 phosphate dehydrogenase(GAPDH)and lipoprotein *** published work strongly suggests that these are on the cell *** these ligands,lprG appears to bind DC-SIGn via typical proteinglycan interactions,but DnaK and Cpn60.1 binding do not show evidence of carbohydrate-dependent *** was also identified as a ligand for DC-SIGnR(L-SIGn;CD299)and the *** orthologue of lprG has been found previously to interact with human toll-like receptor ***,these findings offer new targets for combating mycobacterial adhesion and within-host survival,and reinforce the role of DCSIGn as an important host ligand in mycobacterial infection.

关键词： DC-SIGn Mycobacteria lectins

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

Understanding the Mechanism of nanoparticle Formation in a Wire Explosion Process by Adopting the Optical Emission Technique

引用

Plasma Science and Technology 2013年第6期15卷 562-569页

作者： b.DEbALInA M.KAMARAj S.R.CHAKRAVARTHI n.j.VASA R.SARATHI Dept.of Metallurgical and Materials Engg. IIT MadrasChennai 600036India Dept.of Aerospace Engg. IIT MadrasChennai 600036India Dept.of Engineering Design IIT MadrasChennai 600036India Dept.of Electrical Engg. IIT MadrasChennai 600036India

In the present study nano-tungsten carbide particles were generated in a wire explosion *** plasma generated during the wire explosion process was analyzed using optical emission spectroscopy（OES）.The impact of ambient pressure on the plasma temperature,electron density and plasma lifetime was *** variations of the plasma produced under different experimental conditions were *** produced nanoparticles were characterized through wide angle X-ray diffraction（WAXD） and transmission electron microscopy（TEM） studies. Particles produced with a negative DC charging voltage had a larger mean size when compared to a positive charging *** dependence on the plasma duration was observed where plasma was sustained for a longer duration with a negative DC charging voltage.

关键词： optical emission wire explosion tungsten carbide life time nano particle

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

Evaluation of the Living Conditions and Health Perceptions of Waste Electrical and Electronic Equipment Handlers in the Informal Sector in Dakar

引用

Occupational Diseases and Environmental Medicine 2024年第2期12卷 115-129页

作者： robert Faomowe Foko Awa ndong Marius Kedote Fatoumata bah Absa Lam Cheikh Diop Aminata Toure Mathilde Cabral Mamadou Fall Laboratoire de Toxicologie et d’ Hydrologie Facult&#233 de M&#233decine Pharmacie et Odontostomalogie Universit&#233 Cheikh Anta Diop de Dakar Dakar S&#233n&#233gal Unité Mixte de Recherche d&#8217Exploration et de Diagnostic Unit&#233 de Formation et de Recherche des Sciences de la Sant&#233 Universit&#233 Iba Der Thiam de Thi&#232s Thi&#232s S&#233n&#233gal Institut Ré gional de Sant&#233 Publique Universit&#233 d&#8217Abomey-Calavi Ouidah B&#233nin

Electrical and electronic devices are becoming an increasingly important part of our society. In Africa, and in Senegal in particular, the handling and management of electronic and electrical equipment (EEE) that has reached the end of its life is mainly informal. This professional environment is characterized by the disintegration of the sector and the social heterogeneity that can be found there. The objective of this study is to assess the standard of living of electrical and electronic equipment waste handlers in the Dakar region, as well as their perception of their health. A survey was used to obtain information on sociodemographic background, living arrangements, perception of health status, and good practices to be implemented in case of work-related health problems. Life style, perception of general health and health problems were ranged as excellent, very good, good, average and poor. Informal recyclers in the Dakar region lived mainly in rooms and buildings as tenants (49.1%), or in family homes (48.4%) before starting this activity, and 51.2% continue to live in rooms and buildings as tenants compared to 41.4% who still live in a family home. The perception of health status ranged from poor to excellent, and 4.9% believe that they are limited in work due to a disability or health problem. Informal work is a heterogeneous phenomenon that makes research and policymaking particularly complex. There are several external factors within informal WEEE re-cyclers that can cause health problems or functional disability. However, the living conditions and the perception they have of their state of health are contradictory to the working conditions and the social environment to which they belong. A biomedical approach would consolidate these achievements by confirming or invalidating them.

关键词： E-Waste Informal Work Living Arrangements Health Perception Occupational Exposure

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

Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder bed Fusion

引用

Chinese journal of Mechanical Engineering 2021年第6期34卷 51-62页

作者： M.nuño j.bühring M.n.Rao K.-U.Schröder Institute of Structural Mechanics and Lightweight Design RWTH Aachen UniversityWüllnerstraβe 752072 AachenGermany

Sandwich structures possess a high bending stiffness compared to monolithic structures with a similar *** makes them very suitable for lightweight applications,where high stiffness to weight ratios are *** common manufacturing methods of sandwich structures involve adhesive bonding of the core material with the ***,adhesive bonding is prone to delamination,a failure mode that is often difficult to *** paper presents the results of delamination testing of fully additive manufactured(AM)AlSi10Mg sandwich structures with pyramidal lattice truss core using Laser Powder bed Fusion(LPbF).The faces and struts are 0.5 mm thick,while the core is 2 mm *** inclination of the struts is 45°.To characterise the bonding strength,climbing drum peel tests and out-of-plane tensile tests are *** formulas are derived to predict the expected failure loads and *** analytics and tests are supported by finite element(FE)*** the analytic approach,design guidelines to avoid delamination in AM sandwich structures are *** study presents a critical face sheet thickness to strut diameter ratio for which the structure can *** ratio is mainly influenced by the inclination of the *** peel tests resulted in face yielding,which can also be inferred from the analytics and *** out-of-plane tensile tests didn’t damage the structure.

关键词： Additive Manufacturing Sandwich Structures Pyramidal Lattice Core

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

Calibrated dilatometer exercise to probe thermoplastic properties of coal in pressurized CO2

引用

International journal of Coal Science & Technology 2017年第3期4卷 245-251页

作者： Vyacheslav n. Romanov Ronald j. Lynn robert P. Warzinski U. S. Department of Energy National Energy TechnologyLaboratory P. O. Box 10940 Pittsburgh PA 15236 USA

This research was aimed at testing a hypothesis, that at elevated CO2 pressure coal can soften at temperatures well below those obtained in the presence of other gases. That could have serious negative implications for injection of CO2 into deep coal seams. We have examined the experimental design issues and procedures used in the previously published studies, and experimentally investigated the physical behavior of a similar coal in the presence of COa as a function of pressure and temperature, using the same high-pressure micro-dilatometer refurbished and carefully calibrated for this purpose. no notable reduction in coal softening temperature was observed in this study.

关键词： Dilatometry · Carbon dioxide· Coal· Plasticization

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

A Maschke Type Theorem for Weak Hopf Algebras

引用

Acta Mathematica Sinica,English Series 2008年第12期24卷 2065-2080页

作者： j.n.ALOnSOLVAREZ j.M.FERnnDEZVILAbOA R.GOnZLEZRODRíGUEZ A.b.RODRíGUEZRAPOSO Departamento de Matemáticas Universidad de Vigo. Lagoas-Marcosende Vigo. E-36200 Spain Departamento de lxebra. Universidad de Santiago de Compostela Santiago de Compostela. E-15771 Spain Departamento de Matemdtica Aplicada Ⅱ. Universidad de Vigo. Lagoas-Marcosende Vigo. E-36310 Spain Departamento delxebra Universidad de Santiago de CompostelaSantiago de Compostela E-15771 Spain

In this paper, we give a necessary and sufficient condition for a comodule algebra over a weak Hopf algebra to have a total integral, thus extending the classical theory developed by Doi in the Hopf algebra setting. Also, from these results, we deduce a version of Maschke＇s Theorem for （H, b）-Hopf modules associated with a weak Hopf algebra H and a right H-comodule algebra b.

关键词： Monoidal category weak Hopf algebra Hopf modules Maschke Theorem

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：