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Analysis of monomeric and oligomeric organophosphorus flame retardants in fish muscle tissues using liquid chromatographyeelectrospray ionization tandem mass spectrometry:Application to Nile tilapia(Oreochromis niloticus)from an e-waste processing area in northern Vietnam

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Emerging Contaminants 2016年第2期2卷 89-97页

作者： Hidenori Matsukami Go Suzuki Nguyen minh Tue le Huu Tuyen Pham Hung Viet Shin Takahashi Shinsuke Tanabe Hidetaka Takigami Center for Material Cycles and Waste Management Research National Institute for Environmental Studies(NIES)16-2 OnogawaTsukuba305-8506Japan Graduate School of Frontier Sciences The University of Tokyo5-1-5 KashiwanohaKashiwa277-8563Japan Center for Marine Environmental Studies(CMES) Ehime University2-5 Bunkyo-choMatsuyama790-8577Japan Centre for Environmental Technology and Sustainable Development(CETASD) VNU Hanoi University of Science334 Nguyen TraiHanoiViet Nam Center of Advanced Technology for the Environment(CATE) Faculty of AgricultureEhime University3-5-7 TarumiMatsuyama790e8566Japan

Using electrospray ionization tandem mass spectrometry combined with liquid chromatography(LC),a novel analytical method was developed to quantify eight monomeric organophosphorus flame retardants(m-PFRs)and three oligomeric organophosphorus flame retardants(o-PFRs)in fish muscle *** optimization and validation experiments indicate that the developed method can determine accurately the concentrations of analytes in fish muscle *** recoveries of analytes in fish muscle samples were in the range of 74-105%.The coefficients of variation of the concentrations of analytes in fish muscle samples were 0.6-8.9%.The concentrations of analytes in procedural blanks were below the limit of quantification(LOQ)***,the developed method was applied to the analysis of m-PFRs and o-PFRs in the muscle samples of tilapias collected from an electronic waste(ewaste)processing area in northern *** concentrations of m-PFRs such as tris(2-chloroethyl)phosphate(TCEP),tris(2-chloroisopropyl)phosphate(TCIPP),and triphenyl phosphate(TPHP)were dominant among the investigated *** respective concentrations of TCEP,TCIPP,and TPHP were up to 160,300,and 230 ng g^-1 lipid weight,respectively,whereas those of o-PFRs were up to 10 ng g^-1 lipid *** results of this study indicate lower accumulation potential of o-PFRs compared with m-PFRs for the first time.

关键词： Monomeric organophosphorus flame retardants Oligomeric organophosphorus flame retardants Liquid chromatographyeelectrospray ionization tandem mass spectrometry Fish muscle tissue e-waste

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Analyses on the Ionization Instability of Non-Equilibrium Seeded Plasma in an MHD Generator

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Plasma Science and Technology 2016年第6期18卷 674-679页

作者： le Chi KIEN Ho Chi minh City University of Technology and Education 01 Vo Van Ngan Thu DucHo Chi Minh City Vietnam

Recently,closed cycle magnetohydrodynamic power generation system research has been focused on improving the isentropic efficiency and the enthalpy extraction *** reducing the cross-section area ratio of the disk magnetohydrodynamic generator,it is believed that a high isentropic efficiency can be achieved with the same enthalpy *** this study,the result relating to a plasma state which takes into account the ionization instability of non-equilibrium seeded plasma is added to the theoretical prediction of the relationship between enthalpy extraction and isentropic *** a result,the electron temperature which reaches the seed complete ionization state without the growth of ionization instability can be realized at a relatively high seed fraction ***,the upper limit of the power generation performance is suggested to remain lower than the value expected in the low seed fraction *** is also suggested that a higher power generation performance may be obtained by implementing the electron temperature range which reaches the seed complete ionization state at a low seed fraction.

关键词： isentropic efficiency enthalpy extraction ionization instability seed fraction

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An isogeometric approach to free vibration analysis of bi-directional functionally graded porous doubly-curved shallow microshells with variable length-scale parameters

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Frontiers of Structural and Civil Engineering 2023年第12期17卷 1871-1894页

作者： Khuat Duc DUONG Dao Nhu MAI Phung Van minh Tran Van KE Faculty of Mechanical Engineering Hanoi University of IndustryHanoi 100000Vietnam Institute of Mechanics Vietnam Academy of Science and TechnologyHanoi 100000Vietnam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoi 100000Vietnam

This study uses iso-geometric investigation,which is based on the non-uniform rational B-splines(NURBS)basis function,to investigate natural oscillation of bi-directional functionally graded porous(BFGP)doublycurved shallow microshells placed on Pasternak foundations with any boundary *** characteristics of the present material vary in both thickness and axial directions along the *** be more specific,a material length-scale coefficient of the microshell varies in both thickness and length directions as the material's mechanical *** is able to develop a differential equation system with varying coefficients that regulate the motion of BFGP double-curved shallow microshells by using Hamilton principle,Kirchhoff-Love hypothesis,and modified couple stress *** numerical findings are reported for thin microshells that are spherical,cylindrical,and hyperbolic paraboloidal,with a variety of planforms,including rectangles and *** validity and effectiveness of the established model are shown by comparing the numerical results given by the proposed formulations with previously published findings in many specific *** addition,influences of length scale parameters,power-law indexes,thickness-to-side ratio,and radius ratio on natural oscillation responses of BFGP microshells are investigated in detail.

关键词： Kirchhoff-Love's shell theory isogeometric analysis bi-directional functionally graded free vibration variable length-scale parameter

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Boundless love:a German Professor Uli Schwarz in China

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Protein & Cell 2024年第8期15卷 553-558页

作者： le Kang State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101China

More than 20 years ago,an old German man embarked on a quest to explore the suburbs of Shanghai and the villages of jiangsu Province in search of antique Chinese *** was not a mere antique collector or aficionado of ancient furmiture,but a German scientist motivated by his profound love of Chinese *** name was Uli Schwarz(Fig.1),a distinguished German scientist who had dedicated the majority of his life to promoting cross-cultural scientific exchanges,an effort that left an indelible mark on the landscape of research collaborations between China and Germany.

关键词： Schwarz German landscape

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Sensitivity of wastewater surveillance: What is the minimum COVID-19 cases required in population for SARS-CoV-2 RNA to be detected in wastewater?

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Journal of Environmental Sciences 2023年第3期125卷 851-853页

作者： Connie le Li Ka Shing Institute of Virology Department of Radiation Oncologyand Cross Cancer InstituteUniversity of AlbertaEdmontonAlberta T6G 2G3Canada

Wastewater surveillance, also referred to as wastewaterbased surveillance (WBS) and wastewater-based epidemiology(WBE), has become a powerful tool for the monitoring, control, and prevention of infectious diseases, including COVID-19. Wastewater surveillance is a complementary and unbiased approach to evaluate disease burden at a population level(Hrudey et al., 2022;Kitajima et al., 2020;Kumblathan et al.,2021;Polo et al., 2020).

关键词： wastewater Wastewater prevention

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Novel MAC Layer Proposal for URLLC in IndustrialWireless Sensor Networks

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ZTE Communications 2017年第B6期15卷 50-59页

作者： Mohsin Raza Sajjad Hussain Hoa le-minh Nauman Aslam Northumbria University NewcastleNE18STUK University of Glasgow GlasgowG128QQUK

Ultra-reliable and low-latency communications(URLLC) has become a fundamental focus of future industrial wireless sensor net-works(IWSNs). With the evolution of automation and process control in industrial environments, the need for increased reliabilityand reduced latencies in wireless communications is even pronounced. Furthermore, the 5G systems specifically target the URLLCin selected areas and industrial automation might turn into a suitable venue for future IWSNs, running 5G as a high speed inter-process linking technology. In this paper, a hybrid multi-channel scheme for performance and throughput enhancement of IWSNsis proposed. The scheme utilizes the multiple frequency channels to increase the overall throughput of the system along with theincrease in reliability. A special purpose frequency channel is defined, which facilitates the failed communications by retransmis-sions where the retransmission slots are allocated according to the priority level of failed communications of different nodes. Ascheduler is used to formulate priority based scheduling for retransmission in TDMA based communication slots of this ***, in carrier-sense multiple access with collision avoidance(CSMA/CA) based slots, a frequency polling is introducedto limit the collisions. Mathematical modelling for performance metrics is also presented. The performance of the proposed schemeis compared with that of IEEE802.15.4e, where the performance is evaluated on the basis of throughput, reliability and the num-ber of nodes accommodated in a cluster. The proposed scheme offers a notable increase in the reliability and throughput over theexisting IEEE802.15.4e Low Latency Deterministic Networks(LLDN) standard.

关键词： industrial wireless sensor network(IWSN) IEEE802.15.4e Low Latency Deterministic Network(LLDN) low latency communica-tions(LLC) ultra-reliable low latency communication(URLLC)

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Optimization method to suppress background for imaging multiple planes

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Journal of Innovative Optical Health Sciences 2019年第2期12卷 24-34页

作者： Vannhu le Department of Optical Engineering le Quy Don Technical University 236 Hoang Quoc Viet Street Tu Liem DistrictHanoiVietnam State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou 310027P.R.China Institute of Research and Development Duy Tan University Da Nang 550000Vietnam

3D live imaging is important for better understanding of biological *** obtain biological dynamic process,high imaging speed is *** order to improve speed in 3D live imaging,simultaneous imaging of multiple planes throughout a 3D volume has been ***,a main disadvantage of this method is the cross-talk from neighboring imaging *** this paper,we propose an optimization method to suppress background from neighboring imaging planes.A D-aperture is used to generate multiple light *** optimization method to suppress background is *** simulation results demonstrated that the proposed method can be used to suppress the effectiveness of background from neighboring light sheets.

关键词： Fluorescence microscopy imaging systems supper-resolution

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Optimization the Cell Wall Degrading Enzymes and Technique for Isolation of Protoplasts in Potato

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Journal of Pharmacy and Pharmacology 2016年第4期4卷 179-182页

作者： le minh Phuong Hana Vodickova Brigitazamecnikova Jaromir Lachman Czech University of Life Science in Prague Department of Chemistry Kamycka 961H 29 Suchdol Praha 6 Czech Republic Czech University of Life Science in Prague Department of Chemistry Kamycka 961/129 Suchdol Praha 6 Czech Repubfic

Plasma membrane of plant cells is surrounded by cellulose wall and adjacent cells are joined together by a thick pectin rich matrix. Separation of plant cells and removal of the cell wall experimentally, by either a mechanical or an enzymatic process, results in the production ofprotoplast. Protoplasts are useful tools to study the uptake and transport ofmacromolecules and production of somatic hybrids. Protoplasts can be obtained from all types of actively growing young and healthy tissues. The most convenient and widely used source of plant protoplasts is leaf. Juvenile seedling tissues, cotyledons are other alternative tissues most frequently used for protoplasts isolation. All the environmental and genotypic factors, which affect the cell wall thickenings and compactness indirectly, influence the number of protoplasts recovered. Protoplasts are isolated by two methods, mechanical and enzymatic. The enzyme mixture solution of celluiose/macerozyme is used to digest the cell wall. The critical factors affecting the obtaning ofprotoplasts are the kinds of cell wall degrading enzymes, the physiological state of plant leaves, the type of osmotic stabilizers and the composition of reaction solution. With the improvement of technique and enzyme combination rate, the yield of collected protoplasts will be increased higher.

关键词： Plasma membrane protoplast enzyme cell wall potato plant.

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超碱NLi_(4)团簇修饰DHQ石墨烯的储氢性能研究

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原子与分子物理学报 2025年第5期42卷 95-101页

作者：戴小乐王允辉黄欣南京邮电大学电子与光学工程学院柔性电子(未来技术)学院南京210023 南京邮电大学理学院南京210023

基于第一性原理计算,系统研究了超碱NLi_(4)团簇修饰在DHQ石墨烯表面上的几何结构及吸附能等性质,并深入探索了其储氢性能.研究结果表明:超碱NLi_(4)团簇可以稳定均匀地吸附在DHQ石墨烯表面,Li原子与N原子的强结合能有效避免了Li原子发... 详细信息

基于第一性原理计算,系统研究了超碱NLi_(4)团簇修饰在DHQ石墨烯表面上的几何结构及吸附能等性质,并深入探索了其储氢性能.研究结果表明:超碱NLi_(4)团簇可以稳定均匀地吸附在DHQ石墨烯表面,Li原子与N原子的强结合能有效避免了Li原子发生团聚.每个NLi_(4)团簇周围最多可吸附11个氢气分子,平均吸附能为0.20 eV,最大储氢容量为12.05 wt%,达到美国能源部制定的2025年储氢目标5.5 wt%.最后,基于相对能量计算,发现当压强大于84 bar时,该储氢体系可以在室温下稳定存在.以上结果表明经超碱NLi_(4)团簇修饰的DHQ石墨烯是一种有潜力的储氢材料.

关键词：多孔材料储氢超碱NLi_(4)团簇 DHQ石墨烯第一性原理计算

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Patterns of hepatitis B virus exposure and associated predictors in Vietnam: A crosssectional study

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Asian Pacific Journal of Tropical Medicine 2020年第12期13卷 535-541页

作者： minh C.Duong Phuc V.D.le Oanh N.K.Pham Hien D.T.Pham Toan B.Nguyen Hai T.Phan School of Public Health and Community Medicine University of New South WalesSydneyNew South WalesAustralia MEDIC Medical Center Ho Chi Minh CityVietnam Hospital for Tropical Diseases Ho Chi Minh CityVietnam Pham ngoc Thach University of Medicine Ho Chi Minh CityVietnam

Objective:To examine the magnitude of isolated anti-HBc and other HBV serological patterns and associated predictors among adults seeking general health check-up at a large health center in ***:All 564 outpatients seeking general health checkup between January 2016 and December 2016 were asked to undertake HBV surface antigen,surface antibody,IgG and IgM core antibody(anti-HBc total),platelet counts,and liver function *** administered questionnaire was used to collect information regarding demography,in-house sources of infection,lifestyle,health condition and treatment,and HBV ***:Male gender(P=0.043),age(P=0.000),living in urban areas(P=0.040),HBV vaccination status(P=0.033),and ALT(P=0.040) were associated with isolated *** infection was associated with HBV vaccination status(P=0.001),ALT levels(P=0.010),AST levels(P=0.020),and platelet counts(P=0.007).Past/resolved HBV infection was associated with AST levels(P=0.005),ALT levels(P=0.014),and age(P=0.000).Conclusions:Isolated anti-HBc is quite *** of isolated anti-HBc include male gender,living in rural areas,and HBV *** prevalence of isolated anti-HBc also increases with *** timely detect occult HBV infection and prevent transmission,anti-HBc testing should be included in the health check-up for high risk individuals and screening program where HBV nucleic acid test is not *** prevent transmission,clinicians need to pay more attention on those who are at risk of having isolated anti-HBc and closely follow-up patients with isolated anti-HBc and educate them about the prevention of HBV infection.

关键词： prevention seeking Vietnam

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