检索结果-南通市图书馆

Resilient performance of self-centering hybrid rocking walls with curved interface under pseudo-static loading

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2024年第1期23卷 65-85页

作者： Su xing Yan Shi Sun Xianglei Wang Tao School of Civil Engineering Shenyang Jianzhu UniversityShenyang 110168China PetroChina East China Design Institute Co. Ltd.Qingdao 266000China Qingdao Country Garden Bolin Real Estate Co. Ltd.Qingdao 266100China

Frame and rocking wall(FRW)structures have excellent resilient performance during ***,the concrete at interfacial corners of rocking walls(RWs)is easily crushed due to local extreme compression during the rocking *** innovative RW with a curved interface is proposed to prevent interfacial corners from producing local damage,enhancing its earthquake resilient performance(ERP).The precast wall panel with a curved interface is assembled into an integral self-centering hybrid rocking wall(SCRW)by two post-tensioned unbonded prestressed ***,two ordinary energy dissipation steel rebars and two shear reinforcements are arranged to increase the energy dissipation capacity and lateral *** SCRW specimens and one monolithic reinforced concrete(RC)shear wall(SW)were tested under pseudo-static loading to compare the ERPs of the proposed SCRW and the SW,focusing on studying the effect of the curved interface on the *** key resilient performance of rocking effects,failure modes,and hysteretic properties of the SCRW were *** results show that nonlinear deformations of the SCRW are concentrated along the interface between the SCRW and the foundation,avoiding damage within the *** restoring force provided by the prestressed tendons can effectively realize self-centering capacity with small residual deformation,and the resilient performance of the SCRW is better than that of monolithic *** addition,the curved interface of the SCRW makes the rocking center change and move inward,partially relieving the stress concentration and crush of *** rocking range of the rocking center is about 41.4%of the width of the SCRW.

关键词： self-centering hybrid rocking wall(SCRW) monolithic shear wall(SW) earthquake resilient performance(ERP) curved interface rocking center

Design and synthesis of thiol-terminated imidothioether oligomer as thermally latent hardener and modifier for high-performance epoxy/thiol thermosets

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第2期67卷 632-641页

作者： xing Liu Jianjun Zhou Shumei Liu Jianqing Zhao School of Materials Science and Engineering South China University of TechnologyGuangzhou510640China Key Lab Guangdong High Property&Functional Polymer Materials Key Laboratory of Polymer Processing EngineeringMinistry of EducationGuangzhou510640China

Conventional base-catalyzed epoxy/aliphatic thiol systems have a poor storage stability,and are impossible to be one-pot systems.A widely accepted solution is to use the latent catalysts,which are usually insoluble anionic initiators sensitive to impurities and moisture,and have many limitations in practical *** this work,a soluble thiol-terminated imidothioether oligomer(TPI) was synthesized and used as a latent hardener and modifier to prepare one-pot epoxy/thiol systems without the latent *** latent behavior and curing mechanism of epoxy systems(EP/TPI series),consisted of bisphenol A diglycidyl ether(DGEBA),pentaerythritol tetrakis(mercaptoacetate)(PETMP) and TPI,were *** thiol exchange reaction between TPI and PETMP preceded the curing reaction of DGEBA,and produced aromatic thiols,which were unreactive at ambient conditions and reacted with DGEBA to form the thermosets at temperatures above 130 ℃.At the loading of 24.4 wt%TPI,the epoxy system(EP/TPI-3) had a shelf life of 13 days and was completely cured within 20 min at 180 ℃.Meanwhile,the catalyst-free curing process of EP/TPI-3 system was insensitive to impurities and ***,the thermal and mechanical properties of EP/TPI-3 thermoset were simultaneously improved,thereinto,the glass transition temperature,Young's modulus and ultimate tensile strength were increased by 16.7 ℃,12.9%,and 13.6%,respectively,compared with those of the commercial DGEBA/PETMP *** work shows that TPI has the potential to be a powerful alternative to commercial latent catalysts,and EP/TPI thermosets with high performance have broad application prospects.

关键词： thiol-terminated imidothioether oligomer epoxy systems thiol exchange reaction thermal latency high performance

Study on concentration distribution and detonation characteristics for non-axisymmetric fuel dispersal

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第1期31卷 484-495页

作者： Linghui Zeng Zhongqi Wang xing Chen Jianping Li State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China College of Environment and Chemical Engineering Sichuan University of Science&EngineeringZigong643000China

The study of non-axisymmetric fuel dispersal and detonation can provide reference for the prevention of industrial cloud explosion accidents and the design of fuel air explosive(FAE).The concentration and detonation fields of 85 kg cylindrical and fan-shaped fuel are investigated by experiments and numerical simulations.A dynamic model of the whole process for fuel dispersal and detonation is *** concentration distribution of fuel is used as the initial condition to calculate the detonation stage,thus solving the initial value problem of detonation *** phase and component changes of fuel cloud at different locations are *** fuel cloud is divided into directions of 0°,90°,135°and 180°.The results show that the maximum cloud radius is 20.94 m in 135°and the minimum is 12.04 m in 0°.The diameter of the detonation fireball is 53.6 m,and the peak temperature is 3455 *** highest peak overpressure is 3.44 MPa in 0°and the lowest is 2.97 MPa in 135°.The proportion of liquid phase in 0°is22.90%,and the fuel loss is 11.8% and 9% higher than that in 135°and cylindrical charge,*** stable propagation distance of blast wave in 135°is 42.50% longer than 0°and 28.37% longer than cylindrical charge.

关键词： Fuel dispersal Concentration distribution Detonation characteristic Fuel loss Numerical simulation

Experimental investigation of spectral evolution in flash radiation by hypervelocity impact on aluminum plates

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第7期37卷 96-110页

作者： xing Chen Yonggang Lu Zhiwen Li Zhonghua Cui Institute of Systems Engineering China Academy of Engineering PhysicsMianyang 621900SichuanChina Chongqing Qianwei Technology Group Co. LtdChongqing 401121China

In this study,a series of hypervelocity impact tests were carried out based on a two-stage light gas gun,and the sequence spectrum and radiation evolution data of the impact products under different impact conditions were *** diameter of the projectile is 3-5 mm,the impact velocity is 3.13-6.58 km/s,and the chamber pressure is 0.56-990 *** spectrum of ejected debris cloud in the 250-310 nm band were obtained using a transient spectral measurement system and a multi-channel radiometer measurement *** test results reveal that the flash radiation intensity increases as a power function with the kinetic energy of the ***,the peak value of the line spectrum decreases as the chamber vacuum degree increases,while the radiation width gradually *** line spectrum in the spectral characterization curve corresponds to the ejected debris clouds splitting phase,which does not produce significant line spectrum during material fragmentation and is dominated by the continuum spectrum produced by blackbody *** will appear one or three characteristic peaks in the flash radiation time curve,the first and second peaks correspond to the penetration phase and the third peak corresponds to the expansion phase of the ejected debris clouds on the time scale,the first and second peaks are more sensitive to the chamber vacuum degree,and when the pressure is higher than 99 Pa,the first and second characteristic peaks will *** radiant heat attenuation of the flash under different impact conditions is significantly different,the attenuation exponent has a power function relationship with the impact velocity and the chamber vacuum degree,while the attenuation exponent has a linear relationship with the diameter of the projectile,the specific expression of the attenuation exponent is obtained by *** findings from this research can serve as a valuable reference for remote diagnostic technologies based on flash radiation characte

关键词： Hypervelocity impact Flash radiation Evolution Spectral characteristics Damage evaluation

Topologically protected entanglement switching around exceptional points

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第8期13卷 1631-1644页

作者： Zan Tang Tian Chen xing Tang Xiangdong Zhang Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of Technology100081 BeijingChina

The robust operation of quantum entanglement states is crucial for applications in quantum information,computing,and communications^(1–3).However,it has always been a great challenge to complete such a task because of decoherence and ***,we propose theoretically and demonstrate experimentally an effective scheme to realize robust operation of quantum entanglement states by designing quadruple degeneracy exceptional *** encircling the exceptional points on two overlapping Riemann energy surfaces,we have realized a chiral switch for entangled states with high *** to the topological protection conferred by the Riemann surface structure,this switching of chirality exhibits strong robustness against perturbations in the encircling ***,we have experimentally validated such a scheme on a quantum walk *** work opens up a new way for the application of non-Hermitian physics in the field of quantum information.

关键词： exceptional quantum Riemann

Optical third-harmonic generation of spherical quantum dots under inversely quadratic Hellmann plus inversely quadratic potential

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第9期76卷 158-163页

作者： xing Wang Xuechao Li School of Mechanics and Photoelectric Physics Anhui University of Science and TechnologyHuainan 232001China

The third-harmonic generation(THG)coefficient for a spherical quantum dot system with inversely quadratic Hellmann plus inversely quadratic potential is investigated theoretically,considering the regulation of quantum size,confinement potential depth and the external *** numerical simulation results indicate that the THG coefficient can reach the order of 10~(-12)m~2V~(-2),which strongly relies on the tunable factor,with its resonant peak experiencing a redshift or ***,the effect of temperature on the THG coefficient in terms of peak location and size is consistent with the quantum dot radius but contrasts with the hydrostatic ***,it is crucial to focus on the influence of internal and external parameters on nonlinear optical effects,and to implement the theory in practical experiments and the manufacture of optoelectronic devices.

关键词： nonlinear optical effects quantum dot inversely quadratic hellmann potential inversely quadratic potential third harmonic generation coefficient

在线全文

学校读者我要写书评

暂无评论

面向智能矿山的数字孪生技术研究进展

工矿自动化 2024年第3期50卷 22-34,41页

作者：邢震中煤科工集团常州研究院有限公司江苏常州213015 煤炭智能开采与岩层控制全国重点实验室江苏常州213015 天地(常州)自动化股份有限公司江苏常州213015

智能矿山领域数字孪生技术的应用需面对较多复杂性、特殊性的技术突破。阐述了数字孪生在智能矿山领域的适用性,归纳梳理了数字孪生技术在煤矿安全、生产及运营管理等方面的研究及应用现状:在煤矿安全管理方面,数字孪生技术主要应用于... 详细信息

智能矿山领域数字孪生技术的应用需面对较多复杂性、特殊性的技术突破。阐述了数字孪生在智能矿山领域的适用性,归纳梳理了数字孪生技术在煤矿安全、生产及运营管理等方面的研究及应用现状:在煤矿安全管理方面,数字孪生技术主要应用于灾害预警、风险管控、灾害救援等;在煤矿生产方面,数字孪生技术主要应用于采掘工作面区域整体、单机机械装备状态监测及控制、机械装备预测性维护。从物理实体、虚拟实体、连接交互、数字孪生数据及功能服务5个维度入手探讨了智能矿山领域数字孪生亟待解决的关键共性问题:物理实体维度需重点突破全面感知及控制装备的研发,虚拟实体维度需深入进行物理、行为、规则模型的研究,连接交互维度需攻关煤矿井下5G网络传输关键技术,数字孪生数据维度需解决高性能计算等问题,功能服务维度需研发仿真软件及人工智能算法,以便更好地适应现场环境。从矿井规划设计、开发、建设阶段的灾害预防性设计、生产系统设计、地质环境预测,矿井生产运营阶段的灾害预警及防控、生产调度决策优化、生产设备全生命周期管理等方面展望了数字孪生技术在智能矿山领域的发展趋势,认为宜针对关键部件或装备,核心环节,重要或危险场所、区域等进行精细化孪生。

关键词：数字孪生智能矿山灾害预测及防控生产调度优化

维普期刊数据库博看期刊

涂层中伴有化学反应的传质动力学模型及解析解

在线全文

学校读者我要写书评

暂无评论

兵工学报 2009年第6期30卷 746-752页

作者：黄顺祥郝荣章刘峰程振兴陈海平胡非防化指挥工程学院北京102205 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室北京100029

有害液体在均匀有界固体介质中的扩散通常是一个伴有化学反应的传质过程,本文采用拉普拉斯变换法对其动力学方程进行了新的求解,得出了吸收过程的解析解。通过定义标准函数err(x)及反函数aer(x),推导出当降解速率常数k=0时扩散系数D的... 详细信息

有害液体在均匀有界固体介质中的扩散通常是一个伴有化学反应的传质过程,本文采用拉普拉斯变换法对其动力学方程进行了新的求解,得出了吸收过程的解析解。通过定义标准函数err(x)及反函数aer(x),推导出当降解速率常数k=0时扩散系数D的精确解,理论误差为0.以芥子气在醇酸漆涂层中的传递为例,验证得该方法与实验值的标准差为σ=1.95×10-10cm2/s,其精度远远高于常规方法。在此基础上,求出了液体在涂层中的吸收量、扩散通量,得到了它们的时空分布规律,分析了降解速率常数k对它们的影响。文章更为准确、系统地描述了有害液体在涂层中的吸收规律,所给出的扩散系数计算方法更加简洁、精确,对有害物质的洗消、危害评估及相应措施的制定提供了理论依据。

关键词：化工传递过程吸附动力学拉普拉斯变换扩散系数解析解有界固体介质

Pichia pastoris composition expressed aerolysin mutant of Aeromonas veronii as an oral vaccine evaluated in zebrafish(Danio rerio)

在线全文

学校读者我要写书评

暂无评论

Marine Life Science & Technology 2024年第3期6卷 475-487页

作者： Yuan-Yuan Yao Qing-Shuang Zhang Shu-Bin Liu Hong-Wei Yang xing-Yu Chen Ya-Lin Yang Chen-Chen Gao Chao Ran Tsegay Teame zhen Zhang Zhi-Gang Zhou Key Laboratory for Feed Biotechnology of the Ministry of Agriculture Institute of Feed Research of Chinese Academy of Agricultural SciencesBeijing 100081China Sino-Norway Fish Gastrointestinal Microbiota Joint Lab Institute of Feed Research of Chinese Academy of Agricultural SciencesBeijing 100081China Institute of Marine Sciences Shantou UniversityShantou 515063China Tigray Agricultural Research Institute(TARI)Mekelle Center Tigray 7101Ethiopia

Vaccines are one of the most practical means to stop the spreading of Aeromonas veronii in *** this study,virulence factor aerolysin mutant NTaer which has lost its hemolytic activity was used as a target *** pastoris constitutive secretory expression NTaer(GS115-NTaer)was used as a potential safe oral vaccine to evaluate its effectiveness on zebrafish *** result shows that vaccination of GS115-NTaer for four weeks did not affect the growth performance of the host,while eliciting an effective immune protective *** with the control group,the GS115-NTaer could significantly up-regulate the relative expression level of the intestinal tight junction protein 1α(TJP1α)gene,and significantly increased the contents of lysozyme(LYZ),complement C3 and C4 in the gut,indicating that the innate immune response of the fish was *** relative gene expression levels of macrophage-expressed gene 1(MPEG1)and T cell receptor(TCR-α)in the gut,and MPEG1,CD4,CD8,TCR-α,GATA3,and T-bet in the spleen were all increased significantly,indicating that the cellular immune response of the fish was ***,the contents of serum IgM and intestinal mucosa IgZ antibodies were significantly increased,which showed that humoral immunity was also ***,inoculation with GS115-NTaer significantly changed the structure of gut *** particular,the relative ratio of(Firmicutes+Fusobacteriota+Bacteroidota)/Proteobacteria was significantly higher than that of the control and GS115 ***,the vaccinated fish were challenged with ***,and the relative percent survival of GS115 and the GS115-NTear groups was 14.28%and 33.43%.This improvement of immunity was not only due to the specific immune response but also attributed to the improvement of innate immunity and the gut microbiota which was demonstrated by the germ-free zebrafish ***,this study provides information on the effectiveness of GS115-NTear

关键词： Aeromonas veronii Aerolysin mutant NTaer Oral vaccine Immune response Gut microbiota