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Establishment of a three-dimensional particle library for graded crushed stone based on a new aggregate morphology characterization method

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第1期11卷 117-130页

作者： Haitao Ge Aimin sha Zhenqiang Han School of Future Transportation Chang'an UniversityXi'an 710064China University of Strasbourg INSA StrasbourgCNRSICubeUMR 7357Strasbourg F-67000France School of Highway Chang'an UniversityXi'an 710064China Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an UniversityXi'an 710064China

The morphology of graded crushed stone(GCS)particles has an essential influence on the performance of aggregate *** impact of particle shape is a comprehensive effect that cannot be considered separately,leading to difficulties in establishing the relationship between the mixture properties and the aggregate morphology by using laboratory *** discrete element method(DEM)is an effective way widely adopted to reconstruct the morphology of particles and simulate performance tests of granular ***,selecting limited particles characterizing a real particle-assembly for simulation is still a challenge in current research due to the inherent rich variability of particle *** this study,based on the acquisition of three-dimensional(3D)aggregate shapes by using laser scanning,ellipsoid index(EDI)translating the particle shape as a function of surface area,volume,and contour length is proposed to comprehensively evaluate aggregate ***,a particle library capable of characterizing aggregate morphology distribution is established based on the statistics of the corresponding morphological characteristics of particle *** model reliability is validated by carrying out a series of experimental and numerical penetration tests with nine different *** established particle library can be used to model aggregate mixtures and the proposed simulation framework is promising for optimizing the mixture gradation design numerically.

关键词： Particle library Discrete element method 3D laser scanning Coarse aggregate Morphology characterization Gradation design

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Guaranteeing Wireless Communication Reliability via an Extended Hybrid Carrier System

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China Communications 2023年第7期20卷 192-202页

作者： Ge Song Xiaojie Fang Xuejun sha School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China Engineering Research Center for Dedicated Communication System Ministry of EducationHarbin 150080China

In this paper,we propose an extended hybrid carrier system based on the weighted fractional Fourier transform to ensure the reliability of wireless *** proposed scheme improves the dispersion and compensation capabilities of the hybrid carrier system for channel fading through the design of the signal power distribution,which has greatly reduced the probability of high-power distortion of the signal and improved the bit error rate performance as a *** analysis has shown the superiority of the extended hybrid carrier *** a lower cost of computational complexity increment,the proposed scheme obtains a performance improvement without occupying additional time-frequency physical *** with the existing hybrid carrier scheme,numerical simulation results have shown that the proposed extended hybrid carrier scheme has better anti-fading performance under the doubly-selective channel and improves the reliability of the wireless communication system effectively.

关键词： extended hybrid carrier weighted frac-tional Fourier transform bit error rate doubly-selective channel

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Chen Jiayong:Pioneer in hydrometallurgy and chemical engineering disciplines

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Chinese Journal of Chemical Engineering 2022年第1期35卷 2-5页

作者： Zai-sha Mao Huizhou Liu Chao Yang Institue of Process Engineering Chinese Academy of SciencesBeijing 100190China

*** Jiayong(Chia-Yung)was born on Feb.17,1922 in a prestigous intellectual clan at Jintang County,Sichuan Province,*** receiving early education at the Chengdu County Middle School(now Chengdu 7th School),he was admitted as an undergraduate student to the Department of Chemical Engineering,the National Central University at the city of Chongqing from 1939 through 1943 during the Anti-Japanese *** graduation,he continued to work as a teaching assistant for both the inorganic and organic chemistry courses.

关键词： Chongqing Pioneer admitted

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Enhanced entanglement and asymmetric EPR steering between magnons

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Science China(Physics,Mechanics & Astronomy) 2021年第1期64卷 55-63页

作者： sha-sha Zheng Feng-Xiao Sun Huai-Yang Yuan Zbigniew Ficek Qi-Huang Gong Qiong-Yi He State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics School of Physics&Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing100871China Beijing Academy of Quantum Information Sciences Beijing100193China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China Institute for Theoretical Physics Utrecht University3584CCUtrechtThe Netherlands Quantum Optics and Engineering Division Institute of PhysicsUniversity of Zielona GóraZielona Góra65-516Poland

The generation and manipulation of strong entanglement and Einstein-Podolsky-Rosen(EPR)steering in macroscopic systems are outstanding challenges in modern ***,the observation of asymmetric EPR steering is important for both its fundamental role in interpreting the nature of quantum mechanics and its application as resource for the tasks where the levels of trust at different parties are highly ***,we study the entanglement and EPR steering between two macroscopic magnons in a hybrid ferrimagnet—light *** the absence of light,the two types of magnons on the two sublattices can be entangled,but no quantum steering occurs when they are damped with the same *** the presence of the cavity field,the entanglement can be significantly enhanced,and strong two-way asymmetric quantum steering appears between two magnons with equal *** is very different from the conventional protocols to produce asymmetric steering by imposing additional unbalanced losses or noises on the two parties at the cost of reducing *** essential physics is well understood by the unbalanced population of acoustic and optical magnons under the cooling effect of cavity *** finding may provide a novel platform to manipulate the quantum steering and the detection of bi-party steering provides a knob to probe the magnetic damping on each sublattice of a magnet.

关键词： quantum information magnon entanglement Einstein-Podolsky-Rosen steering cavity induced cooling

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Mechanism of adipose-derived mesenchymal stem cell exosomes in the treatment of heart failure

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World Journal of Stem Cells 2023年第9期15卷 897-907页

作者： Lei Wang Jin-Jin Zhang sha-sha Wang Liang Li Department of Geriatric Medicine Fourth Medical Center of PLA General HospitalBeijing 100048China

BACKGROUND Heart failure(HF)is a global health problem characterized by impaired heart *** remodeling and cell death contribute to the development of *** treatments such as digoxin and angiotensin receptor blocker drugs have been used,their effectiveness in reducing mortality is *** are exploring the use of adipose-derived mesenchymal stem cell(ADMSC)exosomes(Exos)as a potential therapy for *** vesicles,secreted by cells,may aid in tissue repair and regulation of inflammation and immune ***,further investigation is needed to understand the specific role of these vesicles in HF *** To investigate the mechanism of extracellular vesicles produced by ADMSC s in the treatment of *** Exogenous surface markers of ADMSCs were found,and ADMSCs were *** The identification of surface markers showed that the surface markers CD44 and CD29 of adipose-derived stem cells(ADSCs)were well expressed,while the surface markers CD45 and CD34 of ADSCs were negative,so the cultured cells were considered *** blotting detected the Exo surface marker protein,which expressed CD63 protein but did not express calnexin protein,indicating that ADSC-derived Exos were successfully *** The secretion of MSCs from adipose tissue can increase ATP levels,block cardiomyocyte apoptosis,and enhance the heart function of animals susceptible to *** inhibition of Bax,caspase-3 and p53 protein expression may be related to this process.

关键词： Adipose-derived mesenchymal stem cell exosomes Heart failure Cardiomyocyte apoptosis

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Disaster prevention and reduction in Anthropocene

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Frontiers of Environmental Science & Engineering 2016年第5期10卷 5-7页

作者： sha Chen Bo Tao Wei Ren National Disaster Reduction Center of China Ministry of Civil Affairs Beijing 100124China Department of Plant and Soil Sciences College of Agriculture Food and Environment University of Kentucky Lexington KY 40506 USA

Natural disasters cause considerable property damage and loss of life as well as destruction of ecosystem and natural resources. In the context of global change, extreme events are expected to increase in both frequency and intensity. To prevent natural disasters and mitigate the loss, we need to act quickly and effectively. It would be conducive to achieve sustainable economic development, reduce disaster vulnerabilities and risks, and build resilience through implementing effective measures of disaster prevention, preparedness, response, and recovery.

关键词： natural disasters global change Sendai Fra-mework

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Nanoparticle Dispersion and Glass Transition Behavior of Polyimide-grafted Silica Nanocomposites

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Chinese Journal of Polymer Science 2020年第1期38卷 100-108,I0008页

作者： sha-Ni Hu Yu Lin Guo-Zhang Wu shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science and Engineering East China University of Science and Technology

How to control the spatial distribution of nanoparticles to meet different performance requirements is a constant challenge in the field of polymer *** studies have been focused on the flexible polymer chain *** this study,the rigid polyimide(PI) chain grafted silica particles with different grafting chain lengths and grafting densities were prepared by "grafting to" method,and the influence of polymerization degree of grafted chains(N),matrix chains(P),and grafting density(a) on the spatial distribution of nanoparticles in the PI matrix was *** glass transition temperature(Tg) of PI composites was systematically investigated as *** results show that silica particles are well dispersed in polyamic acid composite systems,while aggregation and small clusters appear in PI nanocomposites after thermal ***,the particle size has no impact on the spatial distribution of *** σ·N0.5<<(N/P)2,the grafted and matrix chains interpenetrate,and the frictional resistance of the segment increases,resulting in restricted relaxation kinetics and Tg increase of the PI composite *** addition,smaller particle size and longer grafted chains are beneficial to improving Tg of composites These results are all propitious to complete the microstructure control theory of nanocomposites and make a theoretical foundation for the high performance and multi-function of PI nanocomposites.

关键词： Polyimide grafted nanoparticle Dispersion morphology Glass transition temperature

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Umbelliferone ameliorates renal function in diabetic nephropathy rats through regulating inflammation and TLR/NF-κB pathway

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Chinese Journal of Natural Medicines 2019年第5期17卷 346-354页

作者： WANG Han-Qing WANG sha-sha Chiufai Kuok WANG Qi CHENG Xiao-Lan College of Pharmacy Ningxia Medical University School of Rehabilitation Medicine Binzhou Medical University School of Health Sciences Macao Polytechnic Institute Nanjing Dorra Pharmaceutical Co. Ltd. Laboratory of Cellular and Molecular Biology Jiangsu Province Academy of Traditional Chinese Medicine

Diabetic nephropathy(DN) is a leading cause of renal failure, contributing to severe morbidity and mortality in diabetic patients. Umbelliferae(Umb) has been well characterized to exert protective effects in diabetes. However, the action and mechanism of Umb in DN remains unclear. In this work, we studied the effect of Umb in a streptozotocin(STZ)-induced DN rat model and explore its underlying mechanism. DN rats were treated with Umb(20, 40 mg·kg^(-1)) or irbesartan(15 mg·kg^(-1)) for 4 weeks. Levels of serum glucose, insulin, blood uric acid, creatinine, triglycerides(TG) and total cholesterol(TC) were measured by commercial assay kits,respectively. Histopathological changes and inflammatory cytokine levels including IL-6, IL-1β and TNF-α in the kidney were also evaluated. Alterations in the expression of podocin, CD2 AP and TLR/NF-κB were assessed by western blotting. Our results showed that Umb reduced renal injury in DN rat model, as evidenced by the decrease in blood glucose, 24 h urinary protein, serum creatinine,and blood uric acid. Umb also significantly ameliorated the renal histopathological alteration, and down-regulated the expression of epithelial-to-mesenchymal transition-related molecular markers podocin and CD2AP. Moreover, Umb inhibited TLR2, TLR4, MyD88 expressions, NF-κB activation and considerably reduced levels of other downstream inflammatory molecules(TNF-α, IL-6, IL-1β).These findings indicated that Umb improved renal function through regulating inflammation and TLR/NF-κB pathway, suggesting the potential efficacy of Umb in DN treatment.

关键词： Diabetic nephropathy Umbelliferone Streptozotocin Inflammation TLR/NF-κB pathway

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Fatigue life research and experimental verification of superalloy thin-walled structures subjected to thermal-acoustic loads

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Chinese Journal of Aeronautics 2020年第2期33卷 598-608页

作者： Jian WANG Fengtong ZHAO Yundong sha Song GU Department of Aircraft Maintenance Engineering Chengdu Aeronautic PolytechnicChengdu 610100China Liaoning Key Laboratory of Advanced Test Technology for Aeronautical Propulsion System Shenyang Aerospace UniversityShenyang 110136China

Rapid alternating stress is formed in structure subjected to harsh thermal-acoustic loads,which will affect fatigue performance and reduce fatigue life ***,fatigue experiment of superalloy thin-walled structure was carried out to obtain fatigue damage location and failure time of the experiment specimen,and S-iN curves of superalloy thin-walled structure at 723 K were ***,dynamic response simulation of superalloy thin-walled structure under the same load as experiment was implemented,and fatigue life was estimated based on the fatigue life prediction model which mainly included:improved rain-flow counting method,Morrow average stress model and Miner linear cumulative damage ***,comparisons between simulation solutions and experimental results achieved a consistency,which verified the validity of the Fatigue Life Prediction Model(FLPM).Moreover,taking a rectangle plate as the analysis object,the distributions of Fain-low circulation blocks and damage levels of the structure were discussed ***,current research indicates that in pre-buckling the structure is in softened area and fatigue life decreases with the increase of temperature;in post-buckling the structure is in hardened area and fatigue life increases with the increase of temperature within a certain range.

关键词： Experimental verification Fatigue life Improved rain-flow counting method Rain-flow cycle matrix Rain-flow damage matrix Thermal-acoustic load Thin-walled structures

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Universality of an improved photosynthesis prediction model based on PSO-SVM at all growth stages of tomato

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International Journal of Agricultural and Biological Engineering 2017年第2期10卷 63-73页

作者： Li Ting Ji Yuhan Zhang Man sha sha Li Minzan Key Laboratory of Modern Precision Agriculture System Integration Research Ministry of EducationChina Agricultural UniversityBeijing 100083China Key Laboratory of Agricultural Information Acquisition Technology Ministry of AgricultureChina Agriculture UniversityBeijing 100083China Beijing Research Institute of Uranium Geology Beijing 100029China

CO_(2)concentration is an environmental factor affecting photosynthesis and consequently the yield and quality of *** this study,a photosynthesis prediction model for the entire growth stage of tomatoes was constructed to elevate CO_(2)level on the basis of crop requirements and to evaluate the effect of CO_(2)elevation on leaf *** effect of CO_(2)enrichment on tomato photosynthesis was investigated using two CO_(2)enrichment treatments at the entire growth stage.A wireless sensor network-based environmental monitoring system was used for the real-time monitoring of environmental factors,and the LI-6400XT portable photosynthesis system was used to measure the net photosynthetic rate of tomato *** input variables for the model,environmental factors were uniformly preprocessed using independent component ***,the photosynthesis prediction model for the entire growth stage was established on the basis of the support vector machine(SVM)*** particle swarm optimization(PSO)was also used to search for the best parameters c and g of ***,the relationship between CO_(2)concentration and photosynthetic rate under varying light intensities was predicted using the established model,which can determine CO_(2)saturation points at the various growth *** determination coefficients between the simulated and observed data sets for the three growth stages were 0.96,0.96,and 0.94 with the improved PSO-SVM and 0.89,0.87,and 0.86 with the original *** results indicate that the improved PSO-SVM exhibits a high prediction *** study provides a basis for the precise regulation of CO_(2)enrichment in greenhouses.

关键词： photosynthesis greenhouse tomato CO2 enrichment photosynthesis prediction model wireless sensor network environmental monitoring system

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