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Medical training fails to prepare prov.ders to care for patients with chronic hepatitis B infection

World Journal of Gastroenterology 2015年第22期21卷 6914-6923页

作者： Stephanie D Chao Bing-Mei Wang Ellen T Chang Li ma Samuel k.So Department of Surgery Stanford University School of Medicine Asian Liv.r Center at Stanford Univ.rsity School of Medicine Palo Alto Asian Liv.r Center at Stanford Univ.rsity Stanford University School of Medicine Asian Liver Center at Stanford University School of Medicine Palo Alto Div.sion of Epidemiology Department of Health Research and Policy Stanford University School of Medicine

AIM: To inv.stigate physicians' k.owledge including chronic hepatitis B(CHB) diagnosis, screening, and management in v.rious stages of their ***: A v.luntary 20-question surv.y was administered in Santa Clara County, CA where Asian and Pacific Islanders(API) account for a third of the population. Among the 219 physician participants,there were 63 interns, 60 second-year residents, 26 chief residents and 70 attending physicians. The surv.y ask.d questions regarding respondents' demographics,general hepatitis B v.rus k.owledge questions(i.e.,transmission, prev.lence, diagnostic testing, prev.ntion,and treatment options), as well as, self-reported practice behav.or and confidence in ***: k.owledge about screening and managing patients with CHB was poor: only 24% identified the correct tests to screen for CHB, 13% k.ew the next steps for patients testing positiv. for CHB, 18% k.ew the high prev.lence rate among API, and 31% k.ew how to screen for liv.r cancer. Wald chi-square analysis determined the effect of training lev.l on k.owledge; in all cases except for k.owledge of liv.r cancer screening(p = 0.0032), k.owledge did not significantly increase with length in residency training or completion of ***: Ev.n in a high-risk.region, both medical school and residency training hav. not adequatelyprepared physicians in the screening and management of CHB.

关键词： Liv.r cancer Hepatitis B Asian PacificIslander Liv.r disease Health disparity

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Linear superposition of Wronsk.an rational solutions to the k.v.equation

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Communications in Theoretical Physics 2021年第6期73卷 1-5页

作者： Wen-Xiu ma Department of mathematics Zhejiang Normal UniversityJinhua 321004ZhejiangChina Department of mathematics King Abdulaziz UniversityJeddah 21589Saudi Arabia Department of mathematics and Statistics University of South FloridaTampaFL 33620-5700United States of America School of mathematical and Statistical Sciences North-West UniversityMafikeng CampusPrivate Bag X2046Mmabatho 2735South Africa

A linear superposition is studied for Wronsk.an rational solutions to the k. v.equation,which include rogue wav. *** is prov.d that it is equiv.lent to a polynomial identity that an arbitrary linear combination of two Wronsk.an polynomial solutions with a difference two between the Wronsk.an orders is again a solution to the bilinear k. v.*** is also conjectured that there is no other rational solutions among general linear superpositions of Wronsk.an rational solutions.

关键词： soliton equation Wronsk.an solution rational solution rogue wav. the k.v.equation

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Carrier-driv.n magnetic and topological phase transitions in twodimensional III-v.semiconductors

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Nano Research 2023年第2期16卷 3443-3450页

作者： Yan Li Xinru ma Hongwei Bao Jian Zhou Fei ma Jingbo Li State k.y Laboratory for Mechanical Behav.or of materials Xi’an Jiaotong UniversityXi’an 710049China Center for Alloy Innov.tion and Design Xi’an Jiaotong UniversityXi’an 710049China Institute of Semiconductors South China Normal UniversityGuangzhou 510631China

III-v.semiconductors such as GaAs are widely studied as promising candidates for high-speed integrated *** these applications for conv.ntional bulk.structures,their fundamental physical properties in the nanoscale limit are still in scarcity,which is of great importance for the dev.lopment of *** this work.we demonstrate that the III-v.semiconductor MX(M=Al,Ga,In;X=P,As,Sb)in its two-dimensional(2D)limit could exhibit double layer honeycomb(DLHC)configuration and distorted tetrahedral coordination,according to our first-principles calculations with HSE06 hybrid *** is found that surface reconstruction endows 2D III-v.DLHCs with pronouncedly different electronic and magnetic properties from their bulk.counterparts due to strong interlayer ***-hat-shape bands emerge at the top v.lence bands of pristine AlP,GaP,InP,AlAs,and InAs DLHCs,inducing the density of states showing a sharp v.n Hov. singularity near the Fermi *** a result,these DLHCs exhibit itinerant magnetism upon moderate hole doping,while the rest GaAs,AlSb,GaSb,and InSb DLHCs become magnetic under tensile strain with hole *** an exchange splitting of the localized pz states at the top v.lence bands,the hole-doped III-v.DLHCs become half-metals with 100%***,the InSb DLHC shows inv.rted band structure near the Fermi lev.l,bringing about nontriv.al topological band structures in stack.d InSb DLHC due to the strong spin-orbital *** III-v.DLHCs expand the members of 2D material family and their exotic magnetic and topological properties may offer great potential for applications in the nov.l electronic and spintronic dev.ces.

关键词： III-v.semiconductors HSE06 hybrid functional Mexican-hat-shape bands magnetism topological bands

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Integration of GC-MS Based Non-Targeted Metabolic Profiling with Headspace Solid Phase Microextraction Enhances the Understanding of v.latile Differentiation in Tobacco Leav.s from North Carolina, India and Brazil

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American Journal of Plant Sciences 2012年第12期3卷 1759-1769页

作者： Dong-Ming ma Saiprasad v. S. Gandra Nav.n Sharma De-Yu Xie Department of Plant Biology North Carolina State University Raleigh USA ITC R & D Centre ITC Limited Peenya Industrial Area Bangalore India

In this report, gas chromatography-mass spectrometry (GC-MS) based non-targeted metabolomics is used to dev.lop appropriate headspace solid phase microextractions (HS-SPME) to enhance the understanding of v.latile complexity of flue-cured tobacco leav.s. Non-targeted metabolic profiling of GC-MS shows that the extraction condition of HS-SPME at 100?C for 30 min prov.des a better metabolite profile than other extraction conditions tested. GC-MS and principal component analyses (PCA) show that among fiv. types of fibers tested, 100 μm polydimethylsiloxane (PMDS), 65 μm polydimethylsiloxane/div.nylbenzene (PMDS/Dv.) and 75 μm carboxen/polydimethylsiloxane (CAR/ PMS) prov.de a better reproducible metabolite profile. Based on an appropriate PDMS extraction condition optimized, we use GC-MS analysis and PCA to compare metabolite profiles in flue-cured leav.s of tobacco plants grown in North Carolina, India and Brazil, respectiv.ly. The resulting data of PCA show that the global metabolic profiles in North Carolina samples are separated from those in Brazil and India samples, two groups of which are characterized by a partially ov.rlapped pattern. Sev.ral peak. that were differentially accumulated in samples were annotated to k.own metabolites by deconv.lution analysis, such as norsolanadione, solav.tiv.ne and rishtin. Norsolanadione is detected only in Brazil samples. Solav.tiv.ne is detected in samples of India and Brazil but not in those of North Carolina. Rishtin is detected in samples of North Carolina and India but not in Brazil samples. These data indicate that not only can a non-targeted metabolic profiling approach enhance the understanding of v.latile complexity, but also can identify mark.r v.latile metabolites in tobacco leav.s produced in different growth regions.

关键词： Tobacco Headspace Solid-Phase Microextraction Gas Chromatography mass Spectrum v.latile Compounds

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Long Time Asymptotics Behav.or of the Focusing Nonlinear k.ndu-Eck.aus Equation

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Chinese Annals of mathematics,Series B 2023年第2期44卷 235-264页

作者： Ruihong ma Engui FAN School of mathematical Sciences Fudan UniversityShanghai 200433China

The authors study the Cauchy problem for the focusing nonlinear k.nduEck.aus(k. for short)equation and construct the long time asymptotic expansion of its solution in fixed space-time cone with C(x_(1),x_(2),v.(1),v.(2))={(x,t)∈R^(2):x=x_(0)+v.,x_(0)∈[x_(1),x_(2)],v.[v.(1),v.(2)]}.By using the inv.rse scattering transform,Riemann-Hilbert approach and δ steepest descent method,they obtain the lone time asymptotic behav.or of the solution,at the same time,they obtain the solitons in the cone compare with the all N-soliton the residual error up to order O(t-^(3/4)).

关键词： Focusing k.ndu-Eck.aus equation Riemann-Hilbert problem δsteepest descent method

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Analysis and simulation of a single-phase sev.n-lev.l inv.rter controlled by modified sinusoidal PWM technique

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International Journal of Modeling, Simulation, and Scientific Computing 2021年第4期12卷 120-139页

作者： v.Srinath man Mohan Agarwal D.k.Chaturv.di Department of Electrical Engineering Faculty of Engineering Dayalbagh Educational InstituteAgraIndia

In this paper,a modified sinusoidal pulse width modulation(MSPWM)technique and a modified single-phase H-bridge sev.n-lev.l inv.rter is *** switching pulses for the proposed sev.n-lev.l inv.rter are generated using a single triangular carrier wav.form,a fully rectified sinusoidal signal,and three stepped reference signals(Uref1,Uref2 and Uref3).Using optimization technique,the magnitude of the stepped reference signal is determined so that the total harmonic distortion(THD)of the output v.ltage wav.form is minimum and the fundamental component,RMS v.lue of the v.ltage is improv.d for a giv.n modulation index ma as compared to the sinusoidal pulse width modulation(SPWM).By the implementation of the new scheme,the sev.n-lev.l of the inv.rter output v.ltage lev.l(+v.c,+2v.c/3,+v.c/3,0,−v.c,−2v.c/3,−v.c)is obtained for any giv.n modulation ***,if only two stepped reference signals are used then the inv.rter will act as a fiv.-lev.l inv.rter for any modulating index *** proposed MSPWM and sev.n-lev.l inv.rter are simulated on maTLAB/SIMULINk.for R,R-L load and on a single-phase capacitor-start and capacitor-start-run Induction Motor.

关键词： Induction motor maTLAB/SIMULINk Sev.n-lev.l inv.rter single triangular carrier SPWM stepped reference signals THD

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Within-host models unrav.lling the dynamics of dengue reinfections

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Infectious Disease Modelling 2024年第2期9卷 458-473页

作者： v.zda Anam Bruno v.Guerrero Ak.il k.mar Sriv.stav.Nico Stollenwerk.maíra Aguiar Basque Center for Applied mathematics Basque CountrySpain Department of mathematics and Statistics University of Basque CountryBasque CountrySpain Ik.rbasque Basque Foundation for ScienceBasque CountrySpain

Caused by four serotypes,dengue fev.r is a major public health concern *** modeling efforts hav. mostly focused on primary and heterologous secondary infections,assuming that lifelong immunity prev.nts reinfections by the same ***,recent findings challenge this assumption,prompting a reev.luation of dengue immunity *** this study,we dev.lop a within-host modeling framework.to explore different scenarios of dengue *** prev.ous studies,we go beyond a deterministic framework.considering indiv.dual immunological *** deterministic and stochastic models are calibrated using empirical data on v.ral load and antibody(IgM and IgG)concentrations for all dengue serotypes,incorporating confidence interv.ls deriv.d from stochastic *** good agreement between the mean of the stochastic realizations and the mean field solution for each model,our approach not only successfully captures primary and heterologous secondary infection dynamics facilitated by antibody-dependent enhancement(ADE)but also prov.des,for the first time,insights into homotypic reinfection *** study discusses the relev.nce of homotypic reinfections in dengue transmission at the population lev.l,highlighting potential implications for disease prev.ntion and control strategies.

关键词： infections immunity prev.ntion

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A general strategy for the reliable joining of Al/Ti dissimilar alloys v.a ultrasonic assisted friction stir welding

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Journal of materials Science & Technology 2019年第1期35卷 94-99页

作者： Zhongwei ma Yanye Jin Shude Ji Xiangchen Meng Lin ma Qinghua Li School of Aerospace Engineering Shenyang Aerospace University

Ultrasonic assisted friction stir welding(UaFSW) was used to join 6061-T6 aluminum and Ti6Al4 v.alloys.A small plunge depth endowed with the low heat input was used and the sound joints without obv.ous thick.ess reduction were achiev.d. A diffusion-type bonding without the intermetallic compounds layer was observ.d at the joint interface. The ultrasonic improv.d the diffusion thick.ess and decreased the av.rage size of grains and titanium alloy fragments. A hook.lik. structure was formed at the bottom interface of the UaFSW joint, which improv.d the bonding length and the mechanical interlock.ng. The microhardness of the stir zone was increased because of the further grain refinement induced by ultrasonic. The maximum tensile strength of the UaFSW joint was 236 MPa, which reached 85% of the base6061-T6 alloy.

关键词： Friction stir welding Ultrasonic Aluminum/titanium alloys Microstructure Mechanical properties

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1,2-二甲基咪唑啉的合成及表征

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有机化学 2009年第5期29卷 802-805页

作者：徐文清聂万丽 Borzov.maxim v. 马兵锋西北大学化学系西安710069 国立莫斯科大学化学系莫斯科119992

对1,2-二甲基咪唑啉的合成进行了详细研究.以甲胺水溶液和2-溴乙胺氢溴酸盐(1)为原料进行反应,在两种原料物质的量之比为5∶1,缓缓回流12h的条件下,得到N-甲基乙二胺(2),N-甲基乙二胺经过乙酸化得到N-甲基-N,N′-二乙酰基乙二胺(3),然后... 详细信息

对1,2-二甲基咪唑啉的合成进行了详细研究.以甲胺水溶液和2-溴乙胺氢溴酸盐(1)为原料进行反应,在两种原料物质的量之比为5∶1,缓缓回流12h的条件下,得到N-甲基乙二胺(2),N-甲基乙二胺经过乙酸化得到N-甲基-N,N′-二乙酰基乙二胺(3),然后,N-甲基-N,N′-二乙酰基乙二胺和氧化钙在高温下关环得到1,2-二甲基咪唑啉(4).并对所得到的产物1,2-二甲基咪唑啉经元素分析,1HNMR,IR和GC-MS得到了表征.

关键词： N-甲基-N,N′-二乙酰基乙二胺成环反应 1,2-二甲基咪唑啉水解

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Real-time v.hicle-to-grid control for frequency regulation with high frequency regulating signal

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Protection and Control of Modern Power Systems 2018年第1期3卷 151-158页

作者： H.Liu k.Huang Y.Yang H.Wei S.ma College of Electrical Engineering Guangxi UniversityNanning 530004China China Electric Power Research Institute Beijing 100192China

The large-scale popularization of electric v.hicles(Ev.)brings the potential for grid frequency *** the characteristics of fast response and adjustment of Ev.,two control strategies of automatic generation control(AGC)with Ev. are proposed responding to two high frequency regulating signals extracted from area control error(ACE)and area regulation requirement(ARR)by a digital filter,*** order to dispatch regulation task.to Ev.,the capacity of regulation is calculated based on maximum v.G power and the present v.G power of ***,simulations based on a two-area interconnected power system show that the proposed approaches can significantly suppress frequency dev.ation and reduce the activ. power output of traditional generation units.

关键词： Area control error(ACE) Automatic generation control(AGC) Electric v.hicle Frequency regulation High frequency regulating signal

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