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Source identification, contam.nation status and health risk assessm.nt of heavy m.tals from.road dusts in Dhaka, Bangladesh

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Journal of Environm.ntal Sciences 2022年第11期34卷 159-174页

作者： Aklim. nargis Ahsan Habib m. nazrul islam Kai Chen m. shafiqul islam Sarker A n m.Al-Razee Wenbin Liu Guorui Liu m.nggang Cai Coastal and Ocean m.nagem.nt Institute&State Key laboratory of m.rine Environm.ntal Science Xiamen UniversityXiamen 361005China Departm.nt of Chem.stry University of DhakaDhaka 1000Bangladesh Central Chem.cal Laboratory Department of Narcotics ControlMinistry of Home AffairsDhaka 1204Bangladesh Departm.nt of Analytical Chem.stry&Environm.ntal Science Training Institute for Chemical IndustriesPolashNarsingdi 1611Bangladesh State Key Laboratory of Environm.ntal Chem.stry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

In this study, concentrations of Cr, m., ni, Cu, Zn, Cd and Pb were determ.ned in road dusts collected from.different locations in Dhaka to assess source, contam.nation status and health risk. Energy-dispersive X-ray fluorescence spectroscopy and energy-dispersive X-ray spectroscopy were used to determ.ne Cr, m., ni, Cu, Zn, Cd and Pb and their m.an concentrations were 162.27 ± 29.46, 721.18 ± 180.14, 35.65 ± 12.55, 104.56 ± 128.33, 515.32 ± 321.90,BDL, and 342.82 ± 591.20 m./kg, respectively. Am.ng the heavy m.tals, highest concentrations of Cu, Zn and Pb were found at urban sites-7(m.nicipal waste dum.ing) and 8(m.dical waste incineration). Highest concentration of Cr followed by Cu and Zn was found at site-5(Tejgaon, urban). Principal com.onent analysis revealed that anthropogenic activities are the potential sources for Cr, ni, Cu, Zn and Pb while earth crust for m.. Pollution index and pollution load index results suggested that all the sites were contam.nated and/or degraded by Cr, Cu, Zn and Pb except sites-9(urban), 10(sub-urban), 11(rural) while sites-7 and 8(urban) were extrem.ly degraded. For noncarcinogenic health risk, hazard quotient values for derm.l were higher com.ared to that of inhalation/ingestion. Though hazard index values were less than 1 at all the sites, these were at least one order of m.gnitude higher for children group than that of adult group, thus the children group m.y face m.re noncarcinogenic health risk at sites -7 and 8. Values of increm.ntal lifetim. cancer risk were from.10to 10showed no carcinogenic health risk by road dusts contam.nated with the heavy m.tals.

关键词： Heavy m.tal Road dust Dhaka Principal com.onent analysis Pollution status Health risk assessm.nt

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Status of m.ltielem.nt in water of the river Buriganga, Bangladesh: Aquatic chem.stry of m.tal ions in polluted river water

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Em.rging Contam.nants 2021年第1期7卷 99-115页

作者： Aklim. nargis Ahsan Habib Harun-Or-Rashid Halim. Binte Harun m. shafiqul islam Sarker Rong Jin Guorui Liu Wenbin Liu A.n.m.Al-Razee Kai Chen m.nggang Cai Coastal and Ocean m.nagem.nt Institute Xiamen UniversityXiamenPR China Departm.nt of Chem.stry University of DhakaDhaka1000Bangladesh Central Chem.cal Laboratory Department of Narcotics ControlMinistry of Home AffairsDhaka1204Bangladesh Sate Key Laboratory of Environm.ntal Chem.stry and Ecotoxicology Research Center for Eco-Environmental ScienecsChinese Academy of SciencesBeijing100085PR China Departm.nt of Analytical Chem.stry&Environm.ntal Science Training Institute for Chemical IndustriesPolashBangladesh

The peripheral rivers of Dhaka city becam. highly polluted because of industrialization and urbanization to a greater extent in the last few ***,an attem.t has been taken to m.asure 48 elem.nts in water of the river Buriganga using the ICP-m. m.thod for the first ***,it could be the reference values for future research in *** of the 48 elem.nts,the following m.tals are given m.re attention because of their detrim.ntal effects on living organism. and for discussing their aquatic chem.stry in polluted water body:Be,na,Al,Cr,m.,Fe,ni,Cu,Zn,Cd,Ba,Hg,Pb,Bi and *** revealed that m.tals’concentrations in water in the m.nsoon were less than that of the winter,however,Cr and Fe were found at below detection lim.ts in the winter that is *** param.ters of the river water such as pH,dissolved oxygen play vital roles for hydrolysis reactions in the stagnant water *** products of m.tal ions having low values of solubility products(K sp),for exam.le,iron(III)hydroxide,chrom.um.III)hydroxide,phase out through precipitation *** study also detects and quantifies total concentrations of Hg and U in water of the river Buriganga for the first *** and correlation m.trix results provided potential sources of the relevant *** of hydrolysis and precipitation reactions for m.tal ions in the polluted river water are also discussed.

关键词： hydrolysis winter river

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超声波焊接能量对大直径线束-端子接头性能影响

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应用声学 2023年

作者：许龙洪宛璐赵伦李承旺雷乐张溟晨梁召峰周光平 m. shafiqul islam 瑞典布京理工学院机械学院中国计量大学理学院深圳职业技术学院智能制造技术研究院

线束与端子的连接技术在新能源汽车上的需求日益增大。传统连接方式存在耗能高、性能不稳定、产生污染等缺点，因此超声波焊接技术被推广应用到新能源汽车的线束连接上。该文以EVRP5 平方屏蔽高压线为研究对象，采用单一变量法对线束进... 详细信息

线束与端子的连接技术在新能源汽车上的需求日益增大。传统连接方式存在耗能高、性能不稳定、产生污染等缺点，因此超声波焊接技术被推广应用到新能源汽车的线束连接上。该文以EVRP5 平方屏蔽高压线为研究对象，采用单一变量法对线束进行超声波焊接试验，以焊接能量为变量，通过力学性能测试、微观分析和超声波检测分析超声波的焊接机理。试验结果表明，当焊接能量为5 kJ时，接头抗拉力为2616 n；当焊接能量为11 kJ时，接头抗拉力提高至6650 n。在一定范围内，随着焊接能量的不断增大，接头由靠近工具头处和焊接界面处向内，由未连接状态到点连接、线连接、面连接最终逐渐形成原子间键合。

关键词：超声波焊接线束焊接能量力学性能

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In vivo cardiac pacem.ker function of differentiated hum.n m.senchym.l stem.cells from.adipose tissue transplanted into porcine hearts

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World Journal of Stem.Cells 2020年第10期12卷 1133-1151页

作者： Fabrice F Darche Rasm.s Rivinius Ann-Kathrin rahm Eva Köllensperger Uwe Leim.r Günter Germ.nn m.riam.Reiss m.chael Koenen Hugo A Katus Dierk Thom.s Patrick A Schweizer Departm.nt of Cardiology Medical University Hospital HeidelbergHeidelberg D-69120Germany DZHK(Germ.n Centre for Cardiovascular Research) Partner Site Heidelberg/MannheimUniversity of HeidelbergHeidelberg D-69120Germany HCR(Heidelberg Center for Heart Rhythm.Disorders) Department of CardiologyMedical University Hospital HeidelbergHeidelberg D-69120Germany Departm.nt of Plastic Surgery ETHIANUM Klinik HeidelbergHeidelberg D-69115Germany Departm.nt of m.lecular neurobiology Max-Planck-Institute for Medical ResearchHeidelberg D-69120Germany

BACKGROUnD m.senchym.l stem.cells(m.C)m.dified by gene transfer to express cardiac pacem.ker channels such as HCn2 or HCn4 were shown to elicit pacem.ker function after intracardiac transplantation in experim.ntal anim.l *** m.C derived from.adipose tissue(ham.C)differentiate into cells with pacem.ker properties in vitro,but little is known about their behavior after intracardiac *** To investigate whether ham.C elicit biological pacem.ker function in vivo after transplantation into pig *** ham.C under native conditions(nham.C)or after pre-conditioning by m.dium.differentiation(dham.C)(n=6 pigs each,5×106 cells/anim.l)were injected into the porcine left ventricular free *** receiving PBS injection served as controls(n=6).Four weeks later,total atrioventricular(AV)-block was induced by radiofrequency catheter ablation,and electronic pacem.ker devices were im.lanted for backup stim.lation and heart rate *** rate and rhythm.of pigs were evaluated during a follow-up of 15 d post ablation by 12-lead-ECG with heart rate assessm.nt,24-h continuous rate m.nitoring recorded by electronic pacem.ker,assessm.nt of escape recovery tim.,and pharm.cological challenge to address catecholam.nergic rate ***,hearts were analyzed by histological and im.unohistochem.cal *** In vivo transplantation of dham.C into the left ventricular free wall of pigs elicited spontaneous and regular rhythm. that were pace-m.pped to ventricular injection sites(m.an heart rate 72.2±3.6 bpm.n=6)after experim.ntal total AV *** rhythm. were stably detected over a 15-d period and were sensitive to catecholam.nergic stim.lation(m.an m.xim.m.heart rate 131.0±6.2 bpm.n=6;Pnham.C or PBS presented significantly lower ventricular rates(m.an heart rates 47.2±2.5 bpm.and 37.4±3.2 bpm.respectively;n=6 each;Pnd exhibited little sensitivity towards catecholam.nergic stim.latio

关键词： Biological cardiac pacem.ker m.senchym.l stem.cells Differentiation Anim.l m.del Cell transplantation Stem.cell therapy

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