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Strength criterion of composite solid propellants under dynamic loading

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Defence Technology（防务技术） 2018年第5期14卷 457-462页

作者： zhe-jun wang Hong-fu Qiang Guang wang Biao Geng 206Staff Room Xi'an Hi-Tech Institute

Based on the dynamic loading(1-100 s^(-1)) experiments under different temperatures(223-298 K) and stress states, uniaxial and biaxial strength criterion of a Hydroxyl-terminated polybutadiene(HTPB)based composite solid propellant were further investigated. These experiments were conducted through the use of a new uniaxial INSTRON testing machine, different new designed gripping apparatus and samples with different configurations. According to the test results, dynamic uniaxial tensile strength criterion of the propellant was directly constructed with the master curve of the uniaxial maximum tensile stress. Whereas, a new method was proposed to determine the dynamic uniaxial compressive strength of the propellant in this study. Then uniaxial compressive strength criterion of the propellant was constructed based on the related master curve. Moreover, it found that the uniaxial tensilecompressive strength ratio of the propellant is more sensitive to loading temperature under the test conditions. The value of this parameter is about 0.4 at room temperature, and it reduces to 0.2-0.3 at low temperatures. Finally, the theoretical biaxial strength criterion of HTPB propellant under dynamic loading was constructed with the unified strength theory, the uniaxial strength and the typical biaxial tensile strength. In addition, the theoretical limit lines of the principal stress plane for the propellant under dynamic loading at different temperatures were further plotted, and the scope of the limit line increases with decreasing temperature.

关键词： Strength criterion Unified strength theory Composite solid propellant Dynamic loading Biaxial tension

A credibility-aware swarm-federated deep learning framework in internet of vehicles

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Digital Communications and Networks 2024年第1期10卷 150-157页

作者： zhe wang Xinhang Li Tianhao Wu Chen Xu Lin Zhang School of Artificial Intelligence Beijing University of Posts and TelecommunicationsBeijing100876China

Although Federated Deep Learning(FDL)enables distributed machine learning in the Internet of Vehicles(IoV),it requires multiple clients to upload model parameters,thus still existing unavoidable communication overhead and data privacy *** recently proposed Swarm Learning(SL)provides a decentralized machine learning approach for unit edge computing and blockchain-based coordination.A Swarm-Federated Deep Learning framework in the IoV system(IoV-SFDL)that integrates SL into the FDL framework is proposed in this *** IoV-SFDL organizes vehicles to generate local SL models with adjacent vehicles based on the blockchain empowered SL,then aggregates the global FDL model among different SL groups with a credibility weights prediction *** experimental results show that compared with the baseline frameworks,the proposed IoV-SFDL framework reduces the overhead of client-to-server communication by 16.72%,while the model performance improves by about 5.02%for the same training iterations.

关键词： Swarm learning Federated deep learning Internet of vehicles Privacy Efficiency

Effect of relative humidity on the desulfurization performance of calcium-based desulfurizer

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Journal of Environmental Sciences 2024年第4期138卷 179-188页

作者： Juan Lǖ Yu Fu Haiyan Yu Huanwang zhe wang Haiyan Chen School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China Guangyuan Emergency Management bureau Guangyuan 628000China

Low desulfurization efficiency impedes the wide application of dry desulfurization technology,which is a low-cost and simple process,and one significant solution is the development and manufacture of high-performance *** this study,firstly,a steam jet mill was used to digest quicklime;then,we utilized numerical simulation to study the flow field distribution and analyze the driving factors of quicklime digestion;and lastly,the desulfurization performance of the desulfurizer was evaluated under different relative *** results show that the desulfurizer prepared via the steam jet mill had better apparent activity than traditional ***,the entire jet flow field of the steam jet mill is in a supersonic and highly turbulent flow state,with high crushing intensity and good particle acceleration *** contact with the nascent surface maximizes the formation of slaked *** experiments demonstrated that the operating time with 100%desulfurization efficiency and the“break-through”time for the desulfurizer prepared via the steam jet mill is longer than that of traditional desulfurizers,and has significant advantages,especially at low flue gas relative *** with traditional desulfurizers,the desulfurizer prepared via steam jet mill expands the range of acceptable flue gas temperature,and the failure temperature is 1.625 times that of traditional *** work breaks through the technical bottleneck of low dry desulfurization efficiency,which is an important step in pushing forward the application of dry desulfurization.

关键词： Dry desulfurization Relative humidity Desulfurization efficiency High-efficiency desulfurizer Quicklime digestion

Interaction formulae for buckling and failure of orthotropic plates under combined axial compression/tension and shear

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Chinese Journal of Aeronautics 2022年第3期35卷 272-280页

作者： Binwen wang Xiangming CHEN Xiasheng SUN Puhui CHEN zhe wang Ya’nan CHAI Aeronautics Science and Technology Key Laboratory of Full Scale Aircraft Structure and Fatigue Aircraft Strength Research Institute of ChinaXi’an 710065China Chinese Aeronautical Establishment Beijing 100029China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

An interaction function was constructed based on the axial compression/tension and shear loads of orthotropic *** coefficients of the polynomial function were determined by uniaxial test *** interaction and failure interaction formulae under combined axial tension/compression and shear loads were *** on the uniaxial load test results of orthotropic plates,the buckling load and bearing capacity under any proportion of the combined loads could be predicted by using the proposed interaction *** buckling interaction curves and failure envelopes predicted by the proposed interaction formulae were in excellent agreement with the test results.

关键词： Buckling Combined loads Failure Interaction formulae Orthotropic plate

Pancreatic cancer stem cell markers and exosomes-the incentive push

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World Journal of Gastroenterology 2016年第26期22卷 5971-6007页

作者： Sarah Heiler zhe wang Margot Zoller Tumor Cell Biology University Hospital of SurgeryD 69120 HeidelbergGermany

Pancreatic cancer(Pa Ca) has the highest death rate and incidence is increasing. Poor prognosis is due to late diagnosis and early metastatic spread, which is ascribed to a minor population of so called cancer stem cells(CSC) within the mass of the primary tumor. CSC are defined by biological features, which they share with adult stem cells like longevity, rare cell division, the capacity for self renewal, differentiation, drug resistance and the requirement for a niche. CSC can also be identified by sets of markers, which for pancreatic CSC(Pa-CSC) include CD44v6, c-Met, Tspan8, alpha6beta4, CXCR4, CD133, Ep CAM and claudin7. The functional relevance of CSC markers is still disputed. We hypothesize that Pa-CSC markers play a decisive role in tumor progression. This is fostered by the location in glycolipid-enriched membrane domains, which function as signaling platform and support connectivity of the individual Pa-CSC markers. Outsidein signaling supports apoptosis resistance, stem cell gene expression and tumor suppressor gene repression as well as mi RNA transcription and silencing. Pa-CSC markers also contribute to motility and invasiveness. By ligand binding host cells are triggered towards creating a milieu supporting Pa-CSC maintenance. Furthermore, CSC markers contribute to the generation, loading and delivery of exosomes, whereby CSC gain the capacity for a cell-cell contact independent crosstalk with the host and neighboring non-CSC. This allows PaCSC exosomes(TEX) to reprogram neighboring nonCSC towards epithelial mesenchymal transition and to stimulate host cells towards preparing a niche for metastasizing tumor cells. Finally, TEX communicate with the matrix to support tumor cell motility, invasion and homing. We will discuss the possibility that CSC markers are the initial trigger for these processes and what is the special contribution of CSC-TEX.

关键词： Pancreatic cancer Cancer stem cells Stem cell markers Exosomes Crosstalk

The specific contribution of object's origin on artifacts categorization

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Chinese Science Bulletin 2006年第23期51卷 2851-2859页

作者： SUN Yuhao wang zhe FU Xiaolan State Key Laboratory of Brain and Cognitive Science Institute of Psychology Chinese Academy of Sciences Beijing 100101 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China Department of Psychology Zhejiang Sci-Tech University Hangzhou 310018 China

Gelman and Bloom found that adults and children's object naming was sensitive to how an object was created (man-made or not), but they did not reveal on which specific level of conceptual system this effect was. Using a free-naming task and a force-choice task, two experiments were conducted to test a hypothesis that this effect was specifically on domain level ("artifact/non-artifact" distinction). In Experiment 1, participants were asked to name shortly-depicted objects, rate their confidence, and report their reasons for each naming response. Results showed that most of the naming responses in "man-made" condition were in artifact domain, and most in "natural" condition were in non-artifact domain, although in both conditions names were very divergent on basic level. In Experiment 2, another group of participants were asked to choose one from two names (one in artifact domain and the other in non-artifact domain) to match the same shortly-depicted objects presented in the first experiment. Re-sults of Experiment 1 on domain level were replicated in Experiment 2. These convergent findings supported the hypothesis that the effect of object's origin is specifically on domain level of conceptual system of objects. Reasons explicitly reported for naming responses in Experiment 1 suggested that participants might automatically infer objects' functions in "man-made" condition but not in "natural" condition. Here the function-based hypothesis of artifacts classification is discussed.

关键词：史前古器物起源函数设计特殊贡献

Effect of Curing Age on Chloride Diffusion Coefficient of Recycled Aggregate Concrete Subjected to Compressive Stresses

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第2期35卷 326-333页

作者： Tang Jinzhi Wu Jin wang Wenjian wang zhe Wu Guanzheng College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics

The effect of curing age on chloride diffusion coefficient of recycled aggregate concrete subjected to different compressive stresses was investigated.A compression loading setup was both designed and *** chloride diffusion coefficients of recycled aggregate concrete under compressive stresses were measured by the rapid chloride ion migration(RCM)*** experimental results show that the chloride diffusion coefficients of recycled aggregate concrete(RAC)under different compressive stress ratios generally decrease with the increase of curing *** RAC subjected to the same compressive stress ratios,the chloride diffusion coefficients approximately have power functions with curing ages and the relationship models are ***,the influence of curing age on chloride diffusion coefficient firstly decreases and then increases as the compressive stress ratio increases.

关键词： recycled aggregate concrete(RAC) chloride diffusion coefficient curing age compressive stress ratio rapid chlorideion migration(RCM) method

A fewest-turn-and-shortest path algorithm based on breadth-first search

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Geo-Spatial Information Science 2014年第4期17卷 201-207页

作者： Yan ZHOU Weisheng wang Di HE zhe wang School of Resources and Environment University of Electronic Science and Technology of ChinaChengduP.R.China

Many cognitive studies have indicated that the path simplicity may be as important as its distance ***,the optimality of paths for current navigation system is often judged purely on the distance travelled or time cost,and not the path *** balance these factors,this paper presented an algorithm to compute a path that not only possesses fewest turns but also is as short as possible by utilizing the breadth-first-search *** proposed algorithm started searching from a starting point,and expanded layer by layer through searching zero-level reachable points until the endpoint is found,and then deleted unnecessary points in the reverse *** forward searching and backward cleaning strategies were presented to build a hierarchical graph of zero-level reachable points,and form a fewestturn-path graph(G^(*)).After that,a classic Dijkstra shortest path algorithm was executed on the G^(*) to obtain a fewestturn-and-shortest *** with the shortest path in Baidu map,the algorithm in this work has less than half of the turns but the nearly same *** proposed fewest-turn-and-shortest path algorithm is proved to be more suitable for human beings according to human cognition research.

关键词： fewest-turn-and-shortest path breadth-first search hierarchical graph

Spin-phonon coupling in van der Waals antiferromagnet VOCl

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Chinese Physics B 2021年第10期30卷 560-564页

作者： Wen-Jun wang Xi-Tong Xu Jie Shen zhe wang Shi-Le Zhang zhe Qu Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHefei Institutes of Physical SciencesChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Photovoltaic and Energy Conservation Materials Hefei Institutes of Physical SciencesChinese Academy of SciencesHefei 230031China

We report magnetization and Raman spectroscopy study on single crystals of VOCl,a van der Waals antiferromagnetic *** measurement confirms an antiferromagnetic transition at 79 K and a magnetic easy axis along crystallographic a *** temperature-dependent Raman spectrum reveals five peaks at 30 *** the Neel temperature TN,the Raman-active modes 247 cm^(−1) and 404 cm^(−1) remarkably deviate from the standard Boltzmann function,which is ascribed to the strong magnetoelastic coupling between spins and *** further observe an anomaly in 383 cm^(−1) mode at around 150 *** coincides with the broad maximum in VOCl’s magnetic susceptibility,suggesting a development of short-ranged magnetic order at this temperature.

关键词： vdW material 2D magnetism Raman spectroscopy spin-phonon coupling