|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Ultralight X-type lattice sandwich structure(I):Concept,fabrication and experimental characterization显示文摘A new type of ultra-lightweight metallic lattice structure (named as the X-type structure) is reported. This periodic structure was formed by two groups of staggered struts in the traditional pyramid strurture, and fabricated by folding expanded metal sheet along rows of offset nodes and then brazing the folded structure (as the core) with top and bottom facesheets to form sandwich panels. The out-of-plane compressive and shear properties of the X-type lattice sandwich structure were investigated experimentally and compared to those of the sandwich having a pyramidal truss core. It is found that the formation of the 2-dimensional staggered nodes can effectively make the X-type structure more resistant to inelastic and plastic buckling under both compression and shear loading than the pyramidal lattice truss. Obtained results show that the compressive and shear peak strengths of the X-type lattice structure are about 30% higher than those of the pyramidal lattice truss having the same relative density. | ZHANG QianCheng HAN YunJie CHEN ChangQing LU TianJian | 2009 | Science China(Technological Sciences)2009，52，8： | 14 |
| 2 | MVS-Pheno:A Portable and Low-Cost Phenotyping Platform for Maize Shoots Using Multiview Stereo 3D Reconstruction显示文摘Plant phenotyping technologies play important roles in plant research and agriculture.Detailed phenotypes of individual plants can guide the optimization of shoot architecture for plant breeding and are useful to analyze the morphological differences in response to environments for crop cultivation.Accordingly,high-throughput phenotyping technologies for individual plants grown in field conditions are urgently needed,and MVS-Pheno,a portable and low-cost phenotyping platform for individual plants,was developed.The platform is composed of four major components:a semiautomatic multiview stereo(MVS)image acquisition device,a data acquisition console,data processing and phenotype extraction software for maize shoots,and a data management system.The platform’s device is detachable and adjustable according to the size of the target shoot.Image sequences for each maize shoot can be captured within 60-120 seconds,yielding 3D point clouds of shoots are reconstructed using MVS-based commercial software,and the phenotypic traits at the organ and individual plant levels are then extracted by the software.The correlation coefficient(R^(2))between the extracted and manually measured plant height,leaf width,and leaf area values are 0.99,0.87,and 0.93,respectively.A data management system has also been developed to store and manage the acquired raw data,reconstructed point clouds,agronomic information,and resulting phenotypic traits.The platform offers an optional solution for high-throughput phenotyping of field-grown plants,which is especially useful for large populations or experiments across many different ecological regions. | Sheng Wu Weiliang Wen Yongjian Wang Jiangchuan Fan Chuanyu Wang Wenbo Gou Xinyu Guo | 2020 | Plant Phenomics2020，2，1： | 11 |
| 3 | Numerical and analytical simulation of the structural behaviour of fully grouted cable bolts under impulsive loading显示文摘Designing reliable yielding support system to mitigate the effect of the kinetic energy in burst-prone conditions in mining and tunneling excavations is one of the challenges for geotechnical engineers. A combination of the support elements can be used to increase rock strength and minimise the displacement of unstable rock mass. It is important to understand how the support system works to ensure the stability of underground excavations. Cable bolts have been commonly used as an effective underground support system and an element of reinforcement to improve rock stability. Cable bolts are usually considered to be subjected to static loads under relatively low stress environments, however, in burst-prone conditions, they might be subjected to dynamic loads. Cable bolts as well as other support elements are used in burst-prone conditions to absorb the kinetic energy of the removed rock to avoid sudden and violent failures. This paper develops numerical and a novel analytical simulation technique for cable bolts to assess their structural behaviour under static and dynamic loading conditions. The numerical and analytical models are then validated against experimental observations reported in the literature, which demonstrates the reliability of the proposed models. | Faham Tahmasebinia Chengguo Zhang Ismet Canbulat Onur Vardar Serkan Saydam | 2018 | International Journal of Mining Science and Technology2018，28，5： | 9 |
| 4 | Structuring Nonlinear Wavefront Emitted from Monolayer Transition-Metal Dichalcogenides显示文摘The growing demand for tailored nonlinearity calls for a structure with unusual phase discontinuity that allows the realization of nonlinear optical chirality,holographic imaging,and nonlinear wavefront control.Transition-metal dichalcogenide(TMDC)monolayers offer giant optical nonlinearity within a few-angstrom thickness,but limitations in optical absorption and domain size impose restriction on wavefront control of nonlinear emissions using classical light sources.In contrast,noble metal-based plasmonic nanosieves support giant field enhancements and precise nonlinear phase control,with hundred-nanometer pixellevel resolution;however,they suffer from intrinsically weak nonlinear susceptibility.Here,we report a multifunctional nonlinear interface by integrating TMDC monolayers with plasmonic nanosieves,yielding drastically different nonlinear functionalities that cannot be accessed by either constituent.Such a hybrid nonlinear interface allows second-harmonic(SH)orbital angular momentum(OAM)generation,beam steering,versatile polarization control,and holograms,with an effective SH nonlinearityχ^((2))of~25 nm/V.This designer platform synergizes the TMDC monolayer and plasmonic nanosieves to empower tunable geometric phases and large field enhancement,paving the way toward multifunctional and ultracompact nonlinear optical devices. | Xuanmiao Hong Guangwei Hu Wenchao Zhao Kai Wang Shang Sun Rui Zhu Jing Wu Weiwei Liu Kian Ping Loh Andrew Thye Shen Wee Bing Wang Andrea Alù Cheng-Wei Qiu Peixiang Lu | 2020 | Research2020，，1： | 5 |
| 5 | The Portevin-Le Chatelier effect of gradient nanostructured 5182 aluminum alloy by surface mechanical attrition treatment显示文摘Nanocrystalline surface layers and gradient nanostructure in 5182 aluminum alloy have been produced through surface mechanical attrition treatment(SMAT). The results indicate that the gradient nanostructure can not only improve the mechanical properties of 5182 Al alloy, but also has a certain effect on the Portevin-Le Chatelier(PLC) effect. The yield and ultimate tensile strength of 5182 Al alloy with SMAT are significantly improved combining with the decrease of fracture elongation compared with the as-received one. The PLC effect of 5182 Al alloy could be effectively postponed by the formation of gradient nanostructure after SMAT. It leads to the increase of critical strain of the PLC effect, more concentrated distribution of serrated strain, and increase of average stress amplitude in special strain range. The influence of grain size and gradient nanostructure on the PLC effect of 5182 Al alloy was also discussed in detail. Grain refinement could sharply increase the density of dislocations and hinder the movement of dislocations, which results in the decrease of moving speed of dislocations and the more concentrated distribution of solute atoms. The solute atoms would aggregate to form nano precipitates and further impede movement of dislocation. The stronger interaction between the dislocations and the nano precipitates is the main mechanism of postponed PLC effect. | Xiangchen Meng Bei Liu Lan Luo Yan Ding Xi-Xin Rao Bin Hu Yong Liu Jian Lu | 2018 | Journal of Materials Science & Technology2018，34，12： | 4 |
| 6 | ULTRALIGHT POROUS METALS:FROM FUNDAMENTALS TO APPLICATIONS显示文摘Over the past few years a number of low cost metallic foams havebeen produced and used as the core of sandwich panels and net shaped parts.Themain aim is to develop lightweight structures which are stiff,strong,able to absorblarge amount of energy and cheap for application in the transport and constructionindustries.For example,the firewall between the engine and passenger compartmentof an automobile must have adequate mechanical strength,good energy and soundabsorbing properties,and adequate fire retardance.Metal foams provide all of thesefeatures,and are under serious consideration for this applications by a number of au-tomobile manufacturers(e.g.,BMW and Audi).Additional specialized applicationsfor foam-cored sandwich panels range from heat sinks for electronic devices to crashbarriers for automobiles,from the construction panels in lifts on aircraft carriers tothe luggage containers of aircraft,from sound proofing walls along railway tracks andhighways to acoustic absorbers in lean premixed combustion chambers.But thereis a problem.Before metallic foams can find a widespread application,their basicproperties must be measured,and ideally modeled as a function of microstructuraldetails,in order to be included in a design.This work aims at reviewing the recentprogress and presenting some new results on fundamental research regarding the mi-cromechanical origins of the mechanical,thermal,and acoustic properties of metallicfoams. | 卢天健 | 2002 | Acta Mechanica Sinica2002，18，5： | 4 |
| 7 | The First OCCCO Pentadentate Chelates:Osmium Mediated Stepwise Oxidations of Terminal Alkynes by Pyridine N-Oxide显示文摘of main observation and conclusion Oxygen atom transfer reactions between alkynes and heteroarene N-oxides are currently mediated by transition metal,such as gold,ruthenium or rhodium,but they have never been catalyzed by osmium.Herein,we report stepwise oxidations of terminal alkynes mediated by an osmium carbolong complex,using pyridine N-oxide as the oxidant,yielding novel aldehyde-or carboxylic acid-coordinated osmapentalyne derivatives selectively.The mechanism was illustrated by density functional theory calculations,providing a new route for oxygen atom transfer between heteroarene N-oxides and alkynes. | Jianfeng Lin Qiannan Xu Xinlei Lin Yuhui Hua Dafa Chen Yonghong Ruan Hong Zhang Haiping Xia | 2020 | Chinese Journal of Chemistry2020，38，11： | 4 |
| 8 | Contribution of purinergic receptors to spinal cord injury repair:stem cellbased neuroregeneration显示文摘Traumatic spinal cord injury(SCI),defined as physical trauma to the spinal column yielding altered motor,sensory,or autonomic function,is a devastating neurological disease causing major impact at both personal and societal level.SCI is characterized by a primary insult(compression,contusion or laceration)followed by a secondary | Rosa Gomez-Villafuertes | 2016 | Neural Regeneration Research2016，11，3： | 3 |
| 9 | Challenges and opportunities:a hopeful future of polymer rheology in China显示文摘Polymer rheology has a long research tradition and holds an important position in the scientific community.It is supposed to be a valuable subject to the vast polymer industry.This article points out the exciting developments that are transforming our understanding of the world of polymer rheology.We discuss not only the emerging challenges in the area but also how China might wish to seize the moment,pick up the trend and take advantage of the potential economic benefits to the huge petro-chemical industry of China. | WANG ShiQing Department of Polymer Science,University of Akron,Akron,Ohio,USA | 2010 | Science China Chemistry2010，53，1： | 2 |
| 10 | Transcriptome profiling of Cucumis melo fruit development and ripening显示文摘Hami melon(Cucumis melo)is the most important melon crop grown in the north-western provinces of China.In order to elucidate the genetic and molecular basis of developmental changes related to size,flesh,sugar and sour content,we performed a transcriptome profiling of its fruit development.Over 155000000 clean reads were mapped to MELONOMICS genome,yielding a total of 23299 expressed genes.Of these,554 genes were specifically expressed in flowers,and 3260 genes in fruit flesh tissues.The 7892 differentially expressed genes(DEGs)were related to fruit development and mediated diverse metabolic processes and pathways;83 DEGs and 13 DEGs were possibly associated with sucrose and citric acid accumulation,respectively.The quantitative real-time PCR results showed that six out of eight selected candidate genes displayed expression trends similar to our DEGs.This study profiled the gene expression related to different growing stages of flower and fruit at the whole transcriptome level to provide an insight into the regulatory mechanism underlying Hami melon fruit development. | Hong Zhang Huaisong Wang Hongping Yi Wenqiang Zhai Guangzhi Wang Qiushi Fu | 2016 | Horticulture Research2016，3，1： | 2 |
| 11 | AN ANALYSIS OF THE MODELING OF STRESS AND STRAIN FIELDS IN A REAL MICROSTRUC-TURE USING AHYBRID METHOD显示文摘The distribution of stress and strain fields in a micro-structural area of a particle reinforcedcomposite is studied by a combination of experimental and numerical method(hybrid method).With the ex-perimental values of displacements in a micro-region as the boundary loading condition,strain and stressfields inside the micro-region are calculated by the finite element method tmder two different kinds of model-ing,namely,as plane stress and plane strain condition.The differences between the two kinds of modelingconditions as applied to micro-structural areas are discussed. | E.Soppa S.Schmauder | 2002 | Acta Mechanica Solida Sinica2002，15，3： | 2 |
| 12 | Influence of Defects and Crystallographic Orientation on Mechanical Behavior of Nanocrystalline Aluminium显示文摘Simulation of molecular dynamics using Embedded Atom Method(EAM) potentials is performed to investigate the mechanical properties of single crystal Al along various crystallographic orientations under tensile loading.The specimens are provided with one or two embedded circular voids to analyze the damage evolution by void growth and coalescence.The simulation result shows that the Young's modulus,yielding stress and ultimate stress decrease with the emergence of the voids.Besides,the simulations show that the single-crystal Al in different crystallographic orientations behaves differently in elongation deformations.The single-crystal Al with 100 crystallographic orientations has greater ductility than other orientated specimens.The incipient plastic deformation and the stress-strain curves are presented and discussed for further understanding of the mechanical properties of single-crystal Al. | 蔡军 邓琼 安敏荣 宋海洋 宿梦嘉 | 2016 | Communications in Theoretical Physics2016，65，10： | 1 |
| 13 | Targeting Key Genes to Tailor Old and New Crops for a Greener Agriculture显示文摘Growing crops closer to the consumer is one of many approaches proposed to lessen the environmental footprint associated with food production(Banerjee and Adenauer,2014).This is complicated by an increasingly urban population,the lack of available land in cities and the consequent need for rapid crop cycling.Given these constraints,to date only lettuce and related leafy greens are currently cultivated at scale in urban farms(Touliatos et al.,2016).In recent years,there are increasing interests in the urban agriculture of fruits and berries,since controlled automated vertical farming systems offer the twin advantages of optimizing land use and the ease with which they can be designed to be more environmentally friendly and sustainable than traditional agriculture.However,a considerable challenge is that commercial crop varieties were historically,and still are,bred to be high yielding under typical field and greenhouse parameters.Moreover,given the perishable nature of fruits and berries,a reduced distance from farm to fork renders the shelf-life trait(and its associated detrimental effects on fruit quality)less imperative.Thus,the possibility to improve fruit and berry quality traits is a particularly attractive aspect of urban agriculture.In addition,the environmental benefit for these species is perhaps even greater than for other crops,since they are more often transported by air.A recent study uses multi-site CRISPR/Cas9-mediated genome editing to restructure vine line tomato plants into compact early-yielding plants suitable for urban agriculture(Figure 1),while demonstrating that a single gene editing strategy can produce a compact stature in the related plant groundcherry(Kwon et al.,2019). | Alisdair R.Fernie Jianbing Yan | 2020 | Molecular Plant2020，13，3： | 1 |
| 14 | The measure of friction angles for different types of granular material显示文摘The aim of this research is to deepen the knowledge of the role of friction on the dynamics of granular media; in particular the friction angle is taken into consideration as the physical parameter that drives stability, motion and deposition of a set of grains of any nature and size. The idea behind this work is a question: is the friction angle really that fundamental and obvious physical parameter which rules stability and motion of granular media as it seems from most works which deal with particle dynamics? The experimental study tries to answer this question with a series of laboratory tests, in which different natural and artificial granular materials have been investigated in dry condition by means of a tilting flume. The characteristic friction angles, both in deposition(repose) and stability limit(critical) conditions, were measured and checked against size, shape, density and roughness of the considered granular material. The flume tests have been preferred to 'classical' geotechnical apparatuses(e.g. shear box) since the flume experimental conditions appear closer to the natural ones of many situations of slope stability interest(e.g. a scree slope). The results reveal that characteristic friction angles depend on size and shape of grains while mixtures of granules of different size show some sorting mechanism with less clear behaviour. | DEGANUTTI Andrea Maria TECCA Pia Rosella GENEVOIS Rinaldo | 2019 | Journal of Mountain Science2019，16，4： | 1 |
| 15 | On the measurements of individual particle properties via compression and crushing显示文摘An experimental study is presented to measure the elastic,yielding,and crushing properties of individual particles under compression using substrates made of aluminum alloy,stainless steel,and sapphire.Carefully selected,highly spherical individual Ottawa sand particles of 0.75e1.1 mm in nominal diameter were compressed between two smooth substrates,and the loadedeformation curves were analyzed by Hertz elastic contact theory to derive their reduced modulus and Young’s modulus as well as yielding and crushing strengths,which vary significantly with the type of substrate materials.Further analysis of the yielding and plastic deformation at the particle-substrate contact shows that the yield strength or hardness of the substrate materials dominates the local contact behavior and hence affects the measured apparent yielding and crushing strengths.The two softer substrates(aluminum alloy and stainless steel)actually lead to underestimated apparent shear yield strengths of quartz particles by 60.4%and 54.2%,respectively,which are actually the yielding of substrates,while the true particle yielding occurs in the sapphire-particle contact.Moreover,the two softer substrates cause much overestimated crushing strengths of the quartz particles by 50.4%and 36.4%,respectively.Selection of inappropriate substrate materials and inappropriate interpretation of the particle-substrate contact can lead to significant errors in the measured yielding and crushing strengths.It is recommended that single particle compression testing uses substrates with yield strength greater than that of the tested particles and result interpretation also considers the elastic and yielding behaviors of the substrates. | Chunlong Liu Fengyin Liu Jinliang Song Fuli Ma Dongfang Wang Guoping Zhang | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，2： | 1 |
| 16 | All-Day Thermogalvanic Cells for Environmental Thermal Energy Harvesting显示文摘Direct conversion of the tremendous and ubiquitous low-grade thermal energy into electricity by thermogalvanic cells is a promising strategy for energy harvesting.The environment is one of the richest and renewable low-grade thermal source.However,critical challenges remain for all-day electricity generation from environmental thermal energy due to the low frequency and small amplitude of temperature fluctuations in the environment.In this work,we report a tandem device consisting of a polypyrrole(PPy)broadband absorber/radiator,thermogalvanic cell,and thermal storage material(Cu foam/PEG1000)that integrates multiple functions of heating,cooling,and recycling of thermal energy.The thermogalvanic cell enables continuous utilization of environmental thermal energy at both daytime and nighttime,yielding maximum outputs as high as 0.6 W m^(-2) and 53 mW m^(-2),respectively.As demonstrated outdoors by a large-scale prototype module,this design offers a feasible and promising approach to all-day electricity generation from environmental thermal energy. | Boyang Yu Jiangjiang Duan Jia Li Wenke Xie Hongrun Jin Rong Liu Hui Wang Liang Huang Bin Hu Jun Zhou | 2019 | Research2019，，1： | 1 |
| 17 | ACUPUNCTURE TREATMENT FOR SPRAINS OF THE ANKLE JOINT IN 354 CASES显示文摘Sprains of the ankle joint is one of themost common soft tissue injuries,which isusually caused by a violent twisting.Thismovement can lacerate the interarticular lig-aments and the tendon insertions aroundthe ankle joint.We treated 354 cases of thistype of injury with acupuncture,yielding aninspiring therapeutic result.CLINICAL MATERIALSOf the 354 cases in this series,291 caseswere injured for the first time,and 63 | 张福军 苗玉民 | 1990 | Journal of Traditional Chinese Medicine1990，10，3： | 1 |
| 18 | An elasto-visco-plastic constitutive model of polypropylene incorporating craze damage behavior and its validation显示文摘An elasto-visco-plastic constitutive model incorporating the craze damage behavior was developed for the polypropylene(PP), by using the plastic failure model applied for the concrete, to capture the craze yielding and stress-whitening phenomena. In addition, the developed constitutive model was implemented into finite element codes in Abaqus to simulate the tensile deformation. The standard uniaxial tensile tests were carried out. The stress-strain curves from the uniaxial tensile tests show that the stress keeps decreasing after yielding and the yield stress rises with the increasing of the strain rate. It is worth noting that the craze damage is more visible with higher strain rate. The stress-whitening can be seen clearly around the fracture. The uniaxial tensile tests using specially designed specimen with circular holes weakening were performed for the validation of the developed model. The simulation results of the tensile deformation of the hole-weakened specimen suggest that the stress-whitening could be attributed to the equivalent visco-plastic strain. By comparing between the simulation analysis and the experimental results, the proposed model can describe the stress whitening phenomenon with good accuracy. | 桂中祥 胡肖 王子健 | 2017 | Journal of Central South University2017，24，6： | 1 |
| 19 | Surface Yielding of Metals by X-ray Diffraction显示文摘Surface yielding of metallic material was measured with strain gage and X-ray diffraction methods.The results show that.when the residual stress in the transverse direction is involved,the surface yieldstrength should be evaluated with biaxial Mises criterion.For a medium carbon high strength steel,the yield strength of the bulk material is 581 MPa and the surface yield strengths for 0.05% and0.1%plastic strain are about 436 MPa and 463 MPa respectively.The 0.05% yield strength willapproximately increase to 788 MPa after shot peening.In the early stage of plastic deformation,strain hardening in the surface layer is quite different from that of the bulk sample. | Xiuying GAI Jiabao LI Zengqiao KANG State Key Lab.for Fatigue and Fracture of Materials,Institute of Metal Research,Academia Sinica,Shenyang,110015,ChinaJiawen HE Xi’an Jiaotong University,Xi’an,710049,China | 1993 | Journal of Materials Science & Technology1993，9，3： | 0 |
| 20 | High yielding stimuli-responsive contra-helical trefoil knots显示文摘Knots in naturally occurring biological systems have played a significant role in motivating chemists to develop experimental strategies for the synthesis of molecular knots,due to them being associated with increased thermal and mechanical robustness[1].As such,molecular knots have proven to be worthy synthetic targets,not only for their aesthetic appeal,but also for the potential of discovering novel properties.Since the seminal synthesis of a metal-templated molecular trefoil knot(TK)presented by Sauvage et al.[2]in1989,the field of chemical topology has evolved greatly. | Nowshin Kabir Thirumurugan Prakasam Ali Trabolsi | 2023 | Science China Chemistry2023，66，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员