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Liquefaction susceptibility and deformation characteristics of saturated coral sandy soils subjected to cyclic loadings-a critical review

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 261-296页

作者： chen Guoxing Qin You Ma Weijia Liang Ke Wu Qi c.Hsein Juang Institute of Geotechnical Engineering Nanjing Tech UniversityNanjing 210009China civil Engineering and Earthquake Disaster Prevention center of Jiangsu Province Nanjing 210009China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China college of civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 210016China Glenn Department of civil Engineering Clemson UniversityClemsonSC 29634USA

coral sandy soils widely exist in coral island reefs and seashores in tropical and subtropical *** to the unique marine depositional environment of coral sandy soils,the engineering characteristics and responses of these soils subjected to monotonic and cyclic loadings have been a subject of intense interest among the geotechnical and earthquake engineering *** paper critically reviews the progress of experimental investigations on the undrained behavior of coral sandy soils under monotonic and cyclic loadings over the last three *** focus of coverage includes the contractive-dilative behavior,the pattern of excess pore-water pressure(EPWP)generation and the liquefaction mechanism and liquefaction resistance,the small-strain shear modulus and strain-dependent shear modulus and damping,the cyclic softening feature,and the anisotropic characteristics of undrained responses of saturated coral sandy *** particular,the advances made in the past decades are reviewed from the following aspects:(1)the characterization of factors that impact the mechanism and patterns of EPWP build-up;(2)the identification of liquefaction triggering in terms of the apparent viscosity and the average flow coefficient;(3)the establishment of the invariable form of strain-based,stress-based,or energy-based EPWP ratio formulas and the unique relationship between the new proxy of liquefaction resistance and the number of cycles required to reach liquefaction;(4)the establishment of the invariable form of the predictive formulas of small strain modulus and strain-dependent shear modulus;and(5)the investigation on the effects of stress-induced anisotropy on liquefaction susceptibility and dynamic deformation *** gained through the critical review of these advances in the past decades offer a perspective for future research to further resolve the fundamental issues concerning the liquefaction mechanism and responses of coral sandy sites subjecte

关键词： liquefaction susceptibility dynamic deformation characteristics coral sandy soil cyclic loading review and prospect

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Design of multi-chips LED module for lighting application

Design of multi-chips LED module for lighting application

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海峡两岸第九届照明科技与营销研讨会

作者： J.T.Hsu W.K.Han c.chen F.c.Hwang S.P.Huang Opto-Electronics & System Laboratories Industrial Technology Research Institute chutung Hsinchu 310 Taiwan R.O.C.

White LED is well known as a promising device for solid state lighting. It has the advantages of long life, good endurance of heavy impact, no mercury containing and potentially high efficiency. However, light output from a commercial LED lamp is usually less than 0.1 W, which is very small if compared with traditional light sources. In order to get enough light output from LED devices, a big-lamp or cluster, which is packed from dozens or hundreds of LED lamps, is necessary not only for outdoor display but also for lighting applications. Some problems were encountered during high-density assembly in a big-lamp. Because of the bad heat conductivity of the epoxy, the more LED lamps are used in the big-lamp, the poorer heat dissipation will be. On the other hand, it is difficulty to manufacture a big-lamp in good alignment from each LED lamp during the package. One of the ways to solve this problem is to use a big LED chip instead of many small lamps. Nevertheless, to use those big chips always companions 10-25% loss in the external quantum efficiency. And, the bigger the chip is, the larger the loss will be. Highly concentrated heat will be another issue for the big chip package.

关键词： GaN LED lighting package

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The anti-inflammatory effects of exercise on autoimmune diseases:A 20-year systematic review

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Journal of Sport and Health Science 2024年第3期13卷 353-367,I0001页

作者： Beibei Luo Dao Xiang Xiaorong Ji Xuan chen Rui Li Shuxin Zhang Yujun Meng David c.Nieman Peijie chen School of Exercise and Health Shanghai University of SportShanghai 200438China Shanghai Key Laboratory of Human Performance Shanghai University of SportShanghai 200438China Department of Diving and Hyperbaric Medicine Naval Medical CenterShanghai 200433China National Key Laboratory of Immunity and Inflammation Naval Medical UniversityShanghai 200433China Human Performance Laboratory Appalachian State UniversityNorth Carolina Research CampusKannapolisNC 28081USA Research Institute for Doping control Shanghai University of SportShanghai 200438China

Background:The anti-inflammatory effect of exercise may be an underlying factor in improving several autoimmune *** aim of this systematic review was to examine the evidence on the role of exercise training in mitigating inflammation in adolescents and adults with autoimmune ***:PubMed,Web of Science,and Embase databases were systematically reviewed for related studies published between January 1,2003,and August 31,*** randomized and non-randomized controlled trials of exercise interventions with autoimmune disease study participants that evaluated inflammation-related biomarkers were *** quality of evidence was assessed using the Tool for the assEssment of Study qualiTy and reporting in EXercise scale and cochrane bias risk ***:A total of 14,565 records were *** screening the titles,abstracts,and full texts,87 were eligible for the systematic *** studies were conducted in 25 different countries and included a total of 2779 participants(patients with autoimmune disease,in exercise or control groups).Overall,the evidence suggests that inflammation-related markers such as c-reactive protein,interleukin 6,and tumor necrosis factor a were reduced by regular exercise *** exercise interventions combined with multiple exercise modes were associated with greater ***:Regular exercise training by patients with autoimmune disease exerts an anti-inflammatory *** systematic review provides support for the promotion and development of clinical exercise intervention programs for patients with autoimmune *** patients with autoimmune disease can safely adopt moderate exercise training protocols,but changes in inflammation biomarkers will be modest at *** exercise interventions are ineffective or even modestly but transiently pro-inflammatory.

关键词： Autoimmune diseases cytokines Inflammation Physical activity Training

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为什么要发展教育研究型卫生系统?

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中国循证医学杂志 2013年第5期13卷 520-521页

作者： Lincoln c.chen 蒋茜(译) 美国中华医学基金会主席不详

2012年11月，美国中华医学基金会（china Medical Board，cMB）联合复旦大学在上海共同主办了以加强中国教育研究型卫生系统（academichealthsystem，AHS）为主题的第四届西湖论坛。近200位学术界与政界领导出席了本届论坛，在其所提供... 详细信息

2012年11月，美国中华医学基金会（china Medical Board，cMB）联合复旦大学在上海共同主办了以加强中国教育研究型卫生系统（academichealthsystem，AHS）为主题的第四届西湖论坛。近200位学术界与政界领导出席了本届论坛，在其所提供的平台上，推出了强化和协调中国教育系统与卫生系统的概念基础和运作规则。

关键词：教育研究型卫生系统(AHS)

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专业精神与行业竞争力:以香港为例谈如何确立风景园林行业之专业地位

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中国园林 2009年第1期25卷 10-14页

作者：陈弘志张安美国康奈尔大学香港大学建筑学院园境建筑学部香港园境师学会

自20世纪末以来,我国内地的风景园林行业正在经历着快速和深远的专业化变革。试图探讨在风景园林行业和风景园林教育的专业化进程中如何逐步确立行业的专业地位和专业精神,制订专业操守和行为准则,并保证专业教育中的课程设置和教学模... 详细信息

自20世纪末以来,我国内地的风景园林行业正在经历着快速和深远的专业化变革。试图探讨在风景园林行业和风景园林教育的专业化进程中如何逐步确立行业的专业地位和专业精神,制订专业操守和行为准则,并保证专业教育中的课程设置和教学模式既务实,又能实现风景园林学科在学术和知识体系上的进步。以香港为例,说明了行业竞争力和专业精神之间的关系,以及如何通过制订园境师专业操守、教学评估制度和园境师注册考试制度,加强行业规范,提升行业的国际竞争力。

关键词：风景园林专业精神专业教育竞争力

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A refined representation method of the particle size distribution curve based on grading entropy

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Particuology 2024年第5期88卷 302-311页

作者： Xing Li Qun chen Zhaozhao Liu cheng Zhou chen Wang chen chen State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China

The particle size distribution(PSD)curve is an important expression of the basic properties of the *** characteristic parameters such as median particle size D_(50),effective particle size D_(10),and some combinations of characteristic parameters can only represent some points of the PSD curve,failing to represent all information of the PSD *** this paper,a fraction characteristic parameter F that could reflect the fraction size variation of the PSD curve was introduced based on grading *** a new presentation method of the A-B-F three parameters was proposed for a refined representation of the PSD *** was found that the newly constructed model not only better represents the differences in the width of PSD curves but also has a higher sensitivity than the A-B two-parameter model proposed by Lő*** PSD curves with similar distributions,the new presentation method has a higher degree of discrimination than that of the D_(50)-c_(u)-c_(c) three-parameter or the four-parameter combination G_(c) proposed by ***,the application of this new method in describing the spatial nonuniformity distribution of depositions and predicting the soil hydraulic conductivity was *** research results can provide a reference for the refined representation of PSD curves.

关键词： Grading entropy Particle size distribution curve Refined representation

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Theoretical and experimental study of a bi-stable piezoelectric energy harvester under hybrid galloping and band-limited random excitations

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Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 461-478页

作者： Haitao LI Tianyu ZHENG Weiyang QIN Ruilan TIAN Hu DING J.c.JI Liqun chen Department of Engineering Mechanics North University of ChinaTaiyuan 030051China Department of Engineering Mechanics Northwestern Polytechnical UniversityXi'an 710072China Department of Engineering Mechanics Shijiazhuang Tiedao UniversityShijiazhuang 050043China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of MechnoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China School of Mechanical and Mechatronic Engineering University of Technology SydneyNew South Wales 2007Australia

In the practical environment,it is very common for the simultaneous occurrence of base excitation and *** the combined energy of vibration and wind with a single energy harvesting structure is *** this purpose,the effects of the wind speed and random excitation level are investigated with the stochastic averaging method(SAM)based on the energy *** results of the analytical prediction are verified with the Monte-carlo method(McM).The numerical simulation shows that the introduction of wind can reduce the critical excitation level for triggering an inter-well jump and make a bi-stable energy harvester(BEH)realize the performance enhancement for a weak base ***,as the strength of the wind increases to a particular level,the influence of the random base excitation on the dynamic responses is weakened,and the system exhibits a periodic galloping response.A comparison between a BEH and a linear energy harvester(LEH)indicates that the BEH demonstrates inferior performance for high-speed *** experiments are conducted to investigate the validity of the theoretical prediction and numerical *** experimental findings also show that strong random excitation is favorable for the BEH in the range of low wind ***,as the speed of the incoming wind is up to a particular level,the disadvantage of the BEH becomes clear and evident.

关键词： bi-stability inter-well response galloping band-limited random

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钢热处理应用的氮—水煤气气氛

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铸锻热 1986年第S1期 12-20页

作者： Y—c.chen c—H.Hwang 史泰冈台湾大学

在通常的热处理温度下对大多数金属而言,纯氮是中性的,所以它一直作为光亮处理的令人满意的控制气氛。然而商业标准的氮含有微量的O2、H2O与cO2,因为这些微量杂质也在炉内存在,所以在热处理时,为了避免钢的氧化和脱碳,对氮气必须进行一... 详细信息

在通常的热处理温度下对大多数金属而言,纯氮是中性的,所以它一直作为光亮处理的令人满意的控制气氛。然而商业标准的氮含有微量的O2、H2O与cO2,因为这些微量杂质也在炉内存在,所以在热处理时,为了避免钢的氧化和脱碳,对氮气必须进行一定的预处理。早先的研究者认为,在商业氮中去除杂质气体是极其麻烦的。因此,在实际应用上,常采这样一种比较简单和较为有效的方法:适当地添加H2、cO与cH4以抵消O2、H2O和cO2的氧化和脱碳倾向。最近,我们已研究成功了应用商业氮和水蒸汽混合的方法,即混合气在进入热处理

关键词：水煤气产生速率氮气升/分 cO 工业气体碳势混合气氛

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Mn-doped LiFePO_(4)@c as a high-performance cathode material for lithium-ion batteries

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Particuology 2024年第7期90卷 418-428页

作者： Wenjing chen Fangxiang Song Yumei Yang Qianlin chen School of chemistry and chemical Engineering Guizhou UniversityGuiyang550025China collaborative Innovation center of Guizhou Province for Efficient Utilization of Phosphorus and Fluorine Resources Guizhou UniversityGuiyang550025China

In this work,LiFe_(1-x)MnxPO_(4)@c(x=0,0.01,0.02,0.03)cathode materials were obtained by a simple co-precipitation method and heat treatment,and the influence of Mn-doped modification on the electrochemical performance of LiFePO_(4)@c cathode materials was *** show that by doping an appropriate amount of Mn,the cell volume became larger,and the electronic conductivity increased,which improved the Li+diffusion rate and thus its rate capability and cycle performance of Li-ion *** them,LiFe_(0.98)Mn_(0.02)PO_(4)@c showed superior lithium storage capability;the discharge capacity can reach 150.7 mAh g^(−1)at 0.1 *** cell could discharge up to 155.9 mAh g^(−1)at 1 c under high temperature at 45°c,which was higher than LiFePO_(4)@c(142 mAh g^(−1))under the same test *** discharge capacity of 1 c at room temperature was 139.9 mAh g^(−1),and the cycle stability was 95.9%after 200 *** showed that it had good rate capability and excellent cycle *** results indicate that Mn-doped LFP is a simple and effective strategy for developing high-performance cathode materials.

关键词： Mn-doped LiFePO_(4) Lithium-ion battery High temperature

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Fe-N_(x) sites coupled with core-shell FeS@c nanoparticles to boost the oxygen catalysis for rechargeable Zn-air batteries

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Journal of Energy chemistry 2024年第3期90卷 565-577,I0013页

作者： Katam Srinivas Zhuo chen Anran chen Fei Ma Ming-qiang Zhu Yuanfu chen School of Integrated circuit Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina college of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiChina School of Materials and Energy Yunnan UniversityKunming 650091YunnanChina

The development of efficient single-atom catalysts(SAcs) for the oxygen reduction reaction(ORR)remains a formidable challenge,primarily due to the symmetric charge distribution of metal singleatom sites(M-N_(4)).To address such issue,herein,Fe-N_(x) sites coupled synergistic catalysts fabrication strategy is presented to break the uniform electronic distribution,thus enhancing the intrinsic catalytic ***,atomically dispersed Fe-N_(x) sites supported on N/S-doped mesoporous carbon(NSc)coupled with FeS@c core-shell nanoparticles(FAS-NSc@950) is synthesized by a facile hydrothermal reaction and subsequent *** to the presence of an in situ-grown conductive graphitic layer(shell),the FeS nanoparticles(core) effectively adjust the electronic structure of single-atom Fe sites and facilitate the ORR kinetics via short/long-range coupling ***,FAS-NSc@950displays a more positive half-wave potential(E_(1/2)) of 0.871 V with a significantly boosted ORR kinetics(Tafel slope=52.2 mV dec^(-1)),outpacing the commercial Pt/c(E_(1/2)=0.84 V and Tafel slope=54.6 mV dec^(-1)).As a bifunctional electrocatalyst,it displays a smaller bifunctional activity parameter(ΔE) of 0.673 V,surpassing the Pt/c-RuO_(2) combination(ΔE=0.724 V).Besides,the FAS-NSc@950-based zincair battery(ZAB) displays superior power density,specific capacity,and long-term cycling performance to the Pt/c-Ir/c-based *** work significantly contributes to the field by offering a promising strategy to enhance the catalytic activity of SAcs for ORR,with potential implications for energy conversion and storage technologies.

关键词： Fe-N_(x)sites core-shell FeS@c Synergistic interactions Oxygen reduction reaction Zn-air battery

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