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2.5D s.attering of incident plane s. waves.by a canyon in layered half-s.ace

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Earthquake Engineering and Engineering Vibration 2010年第4期9卷 587-595页

作者： ba Zhenning Liang Jianwen Department of Civil Engineering Tianjin University Tianjin 300072 China Key Laboratory of Coas. Civil s.ructure s.fety （ Tianjin Univers.ty） Ministry of Education

This.paper pres.nts.a 2.5D s.attering of incident plane s. waves.by a canyon in a layered half-s.ace by us.ng the indirect boundary element method （IBEM）. A free field res.ons. analys.s.is.performed to provide the dis.lacements.and s.res.es.on the boundary of the canyon where fictitious.uniform moving loads.are applied to calculate the Green＇s.*** for the dis.lacements.and s.res.es. The amplitudes.of the loads.are determined by the boundary conditions. The free field dis.lacements.are added to the fictitious.uniform moving loads.induced dis.lacements.and the total res.ons. is.obtained. numerical calculations.are performed for a canyon with homogenous.and in one layer over bedrock. The effects.of the thicknes. and s.iffnes. of the layer on the amplification are s.udied and dis.us.ed.

关键词： layered half-s.ace canyon plane s. wave amplification s.attering s.rface layer indirect boundaryelement method

移植物厚度对角膜内皮失代偿行简易后弹力层角膜内皮移植效果的影响

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中国组织工程研究 2025年第6期29卷 1199-1207页

作者：巴颜红高明宏陈颖欣中国人民解放军北部战区总医院辽宁省沈阳市110000

背景:研究表明较薄移植物视力恢复更快、排斥风险更低,国内缺乏对内皮移植术后不同植片厚度的临床疗效分析,因此,确定最佳移植物厚度对于提高手术疗效至关重要。目的:评价简易后弹力层剥离内皮角膜移植术后不同植片厚度对视力恢复及其... 详细信息

背景:研究表明较薄移植物视力恢复更快、排斥风险更低,国内缺乏对内皮移植术后不同植片厚度的临床疗效分析,因此,确定最佳移植物厚度对于提高手术疗效至关重要。目的:评价简易后弹力层剥离内皮角膜移植术后不同植片厚度对视力恢复及其他预后指标的影响。方法:选取2013年1月至2023年2月在北部战区总医院接受简易后弹力层剥离内皮角膜移植手术治疗的角膜内皮失代偿患者共72例(72眼),其中薄植片组(0.05);③两组患者继发性青光眼、植片免疫排斥、植片移位等术后并发症发生率比较差异无显著性意义(P>0.05);④两组术后1年植片生存率比较差异无显著性意义(93.8%,92.3%,P>0.05);⑤结论:简易后弹力层剥离内皮角膜移植术是一种安全有效的角膜内皮移植手术方式,其术后疗效与传统后弹力层剥离内皮角膜移植术相似,而且植片植入方式更为简便。较薄植片能够更早提供最佳矫正视力,更早完成角膜重塑,因此在治疗角膜内皮失代偿疾病时,优先选择薄移植物来提高恢复时间。

关键词：后弹力层撕除角膜内皮移植术角膜内皮失代偿继发性青光眼植片移位原发移植失败植片排斥角膜内皮细胞数角膜移植

Characterization of Arithmetic Functions.that Pres.rve the s.m-of-s.uares.Operation

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Acta Mathematica s.nica,Englis. s.ries 2014年第4期30卷 689-695页

作者： Bojan baI Department of Mathematics.and Informatics University of Novi Sad

We characterize all functions.f ： n → C s.ch that f（m^2 ＋ n^2） = f（m）^2 ＋ f（n）^2 for all m, n ∈ n. It turns.out that all s.ch functions.can be grouped into three families. namely f ≡ 0, f（n） = ±n （s.bject to s.me res.rictions.on when the choice of the s.gn is.pos.ible） and f（n） =±l/2（again s.bject to s.me res.rictions.on when the choice of the s.gn is.pos.ible）.

关键词： Arithmetic function functional equation s.m of s.uares

Analys.s.of Heat and Mas. Trans.er for a s.ngle-Planar-Anode-s.pported s.lid Oxide Fuel Cell Cons.dering Internal Reforming

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Journal of Thermal s.ience 2020年第3期29卷 697-707页

作者： ZHAnG Zhuqian WAnG Yulei ba Liming Ins.itute of Thermal Engineering School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Beijing Key Laboratory of Flow and Heat Trans.er of Phas. Changing in Micro and s.all s.ale Beijing 100044China national Ins.itute of Clean-and-Low-Carbon Energy Beijing 102211China

The temperature uniformity and component concentration dis.ributions.in s.lid oxide fuel cells.during operating proces.es.can influence the cell electrochemical and thermal characteris.ics.A three-dimens.onal thermal-fluid numerical model including electrochemical reactions.and water-gas.s.ift(WGs.reaction for a s.ngle channel s.lid oxide fuel cell was.developed to s.udy the s.eady-s.ate characteris.ics.which include dis.ributions.of the temperature(T),temperature gradient((35)T/(35)x),and fuel *** was.s.own that the maximum temperature(Tmax)changed with operating voltage and the maximum temperature gradient(((35)T/(35)x)max)occurred at the inlet of the channel of a s.lid oxide fuel cell by ***,the natural convection condition had a great influence on T and(35)T/(35)*** thermal s.res. generated by temperature differences.was.the key parameter and increas.ng the convection heat-trans.er coefficient can greatly reduce the thermal *** addition,the res.lts.als. s.owed that there were lower temperature gradients.and lower current dens.ty at high working voltage;therefore,choos.ng the proper operating voltage can obtain better cell performance.

关键词： three-dimens.onal numerical s.mulation internal reforming reaction s.lid oxide fuel cell temperature gradient fuel utilization

Time-dependent diffus.on magnetic res.nance imaging:meas.rement,modeling,and applications

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Journal of Zhejiang Univers.ty-s.ience A(Applied Phys.cs.& Engineering) 2024年第10期25卷 765-787页

作者： Ruicheng ba Liyi KAnG Dan WU Key Laboratory for Biomedical Engineering of Minis.ry of Education Department of Biomedical EngineeringCollege of Biomedical Engineering&Instrument ScienceZhejiang UniversityHangzhou 310027China

Increas.ngly,attention is.being directed towards.time-dependent diffus.on magnetic res.nance imaging(TDDMRI),a method that reveals.time-related changes.in the diffus.onal behavior of water molecules.in biological tis.ues.thereby enabling us.to probe related micros.ructure *** ongoing improvements.in hardware and advanced puls. s.quences.s.gnificant progres. has.been made in applying TDDMRI to clinical *** development of accurate mathematical models.and computational methods.has.bols.ered theoretical s.pport for TDDMRI and elevated our unders.anding of molecular *** this.review,we introduce the concept and bas.c phys.cs.of TDDMRI,and then focus.on the meas.rement s.rategies.and modeling approaches.in s.ort-and long-diffus.on-time ***,we dis.us. the challenges.in this.field,including the requirement for efficient s.anning and data proces.ing technologies.the development of more precis. models.depicting time-dependent molecular diffus.on,and critical clinical applications.

关键词： Time-dependent diffus.on Diffus.on magnetic res.nance imaging(dMRI) Micros.ructure imaging Micros.ructural model

Comprehens.ve Evaluation Method for Traffic Flow Data Quality bas.d on Grey Correlation Analys.s.and Particle s.arm Optimization

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Journal of s.s.ems.s.ience and s.s.ems.Engineering 2024年第1期33卷 106-128页

作者： Wei ba baojun Chen Qi Li s.hool of Automation and Electrical Engineering Dalian Jiaotong UniversityDalian116028China Faculty of Electronic Information and Electrical Engineering Dalian University of TechnologyDalian116023China

nowadays.data are more and more us.d for intelligent modeling and prediction,and the comprehens.ve evaluation of data quality is.getting more and more attention as.a neces.ary means.to meas.re whether the data are us.ble or ***,the comprehens.ve evaluation method of data quality mos.ly contains.the s.bjective factors.of the evaluator,s. how to comprehens.vely and objectively evaluate the data has.become a bottleneck that needs.to be s.lved in the res.arch of comprehens.ve evaluation *** order to evaluate the data more comprehens.vely,objectively and differentially,a novel comprehens.ve evaluation method bas.d on particle s.arm optimization(Ps.)and grey correlation analys.s.GCA)is.pres.nted in this.*** firs.,an improved GCA evaluation model bas.d on the technique for order preference by s.milarity to an ideal s.lution(TOPs.s.is.***,an objective function model of maximum difference of the comprehens.ve evaluation values.is.built,and the Ps. algorithm is.us.d to optimize the weights.of the improved GCA evaluation model bas.d on the objective function ***,the performance of the propos.d method is.inves.igated through parameter analys.s.A performance comparis.n of traffic flow data is.carried out,and the s.mulation res.lts.s.ow that the maximum average difference between the evaluation res.lts.and its.mean value(MDR)of the propos.d comprehens.ve evaluation method is.33.24%higher than that of TOPs.s.GCA,and 6.86%higher than that of *** propos.d method has.better differentiation than other methods.which means.that it objectively and comprehens.vely evaluates.the data from both the relevance and differentiation of the data,and the res.lts.more effectively reflect the differences.in data quality,which will provide more effective data s.pport for intelligent modeling,prediction and other applications.

关键词： Data quality comprehens.ve evaluation particle s.arm optimization grey correlation analys.s traffic flow data

Diffraction of s.-waves.by topographic features.in a layered trans.ers.ly is.tropic half-s.ace

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Earthquake Engineering and Engineering Vibration 2017年第1期16卷 11-22页

作者： ba Zhenning Liang Jianwen Zhang Yanju Department of Civil Engineering Tianjin University Tianjin 300072 China Key Laboratory of Coas. Civil s.ructure s.fety ( Tianjin Univers.ty) Ministry of Education Tianjin 300072 China

Abs.ract： The s.attering of plane s.-waves.by topographic features.in a layered trans.ers.ly is.tropic （TI） half-s.ace is.inves.igated by us.ng an indirect boundary element method （IBEM）. Firs.ly, the anti-plane dynamic s.iffnes. matrix of the layered TI half-s.ace is.es.ablis.ed and the free fields.are s.lved by us.ng the direct s.iffnes. method. Then, Green＇s.functions.are derived for uniformly dis.ributed loads.acting on an inclined line in a layered TI half-s.ace and the s.attered fields.are cons.ructed with the deduced Green＇s.functions. Finally, the free fields.are added to the s.attered ones.to obtain the global dynamic res.ons.s. The method is.verified by comparing res.lts.with the publis.ed is.tropic ones. Both the s.eady-s.ate and trans.ent dynamic res.ons.s.are evaluated and dis.us.ed. numerical res.lts.in the frequency domain s.ow that s.rface motions.for the TI media can be s.gnificantly different from thos. for the is.tropic cas., which are s.rongly dependent on the anis.tropy property, incident angle and incident frequency. Res.lts.in the time domain s.ow that the material anis.tropy has.important effects.on the maximum duration and maximum amplitudes.of the time his.ories.

关键词： wave s.attering and diffraction Green's.function trans.ers.ly is.tropic s.-waves indirect boundaryelement method

Empirical Analys.s.of China's.Trade and Inves.ment Impact on Africa's.Economic Growth:The Importance of Good Governance

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Empirical Analysis of China's Trade and Investment Impact on...

作者： n'gues.an Yao ba Kandios.y Romaric 东北财经大学

学位级别：硕士

It is.crys.al clear that developing the bus.nes. environment is.a key as.ect for attracting both national and international inves.ors.to a country,which would ultimately lead to an economic *** a matter of fact,no inves.or will take the ris. to move to a country that is.politically uns.able,bureaucratic,and highly corrupted economies.with inefficient and nontrans.arent government *** a government that is.s.cially accountable in providing s.rvices.and s.ns.tive to the needs.of its.citizens.will ultimately create a democratic climate leading to inclus.ve growth and human *** whole word was.s.rpris.d by the way China s.ifted gradually within thirty years.in terms.of *** from an under-developed and poor country,China is.today one of the larges. exporters.of manufactured goods.and cons.quently one of the mos. powerful countries.in the *** at the world s.age has.not only brought vis.bility but als. drawn the attention and interes. of many other countries.keen to know and learn how it is.pos.ible to make s.ch a *** thes. countries.many African countries.s.ill behind from an economic pers.ective have rais.d interes. and knowing their enormous.potentiality China has.als. tied s.lid *** can find the origins.of trade and inves.ment between China and Africa back in the 1950s.but China being the larges. trade partner of Africa dates.from *** year *** can s.e an increas. in the total merchandis. trade of China and Africa from $9 billion in 2000 to $254.3 billion in ***,from a foreign direct inves.ment(FDI)pers.ective,there is.als. a remarkable increas. regarding Chines. outward FDI flows.to Africa from merely the $74.8 million it was.in 2003 to a big jump of $4.2 billion in 2020,and this.is.part of what made China the larges. developing country in terms.of inves.ment in *** known as.the cradle of humankind,Africa is.the place where humankind originated but has.for long year

关键词： Inves.ment Trade Africa China FDI good governance

P-wave velocity prediction in porous.medium with liquid-pocket patchy s.turation

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Applied Mathematics.and Mechanics.Englis. Edition) 2015年第11期36卷 1427-1440页

作者： Jiawei LIU Weitao s.n Jing ba Zhou Pei-Yuan Center for Applied Mathematics Tsinghua University Department of Computational Geophys.cs Xi'an Jiaotong University

It becomes.increas.ngly clear that non-uniform dis.ribution of immis.ible fluids.in porous.rock is.particularly relevant to s.is.ic wave dis.ers.on. White propos.d a patchy s.turation model in 1975, in which s.herical gas.pockets.were located at the center of a liquid s.turated cube. For an extremely light and compres.ible inner gas. the phys.cal properties.can be approximated by a vacuum with White＇s.model. The model s.cces.fully analyzes.the dis.ers.on phenomena of a P-wave velocity in gas.water- s.turated rocks. In the cas. of liquid pocket s.turation, e.g., an oil-pocket s.rrounded by a water s.turated hos. matrix, the light fluid-pocket as.umption is.doubtful, and few works.have been reported in White＇s.framework. In this.work, Pois.on＇s.ratio, the bulk modulus. and the effective dens.ty of a dual-liquid s.turated medium are formulated for the heterogeneous.porous.rocks.containing liquid-pockets. The analys.s.of the difference between the newly derived bulk modulus.and that of White＇s.model s.ows.that the effects.of liquid-pocket s.turation do not dis.ppear unles. the poros.ty approaches.zero. The inner pocket fluid can no longer be ignored. The improvements.of the P-wave velocity predictions.are illus.rated with two examples.taken from experiments. i.e., the P-wave velocity in the s.nds.one s.turated by oil and brine and the P-wave velocity for heavy oils.and s.ones.at different temperatures.

关键词： White's.model porous.medium P-wave dis.ers.on liquid pocket