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Investigation of anisotropic strength criteria for layered rock mass

Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1289-1304页

作者： Shuling Huang Jinxin Zhang Xiuli Ding Chuanqing Zhang Gang Han guoqi yu Lulu Qu Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources Changjiang River Scientific Research InstituteWuhan430071China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430000China University of Chinese Academy of Sciences Beijing100049China

Layered rock mass is a type of engineering rock mass with sound mechanical anisotropy,which is generally unfavorable to the stability of underground *** investigate the strength anisotropy of layered rock,the Mohr-Coulomb and Hoek-Brown criteria are introduced to establish the two transverse isotropic strength criteria based on Jaeger's single weak plane theory and maximum axial strain theory,and parameter determination ***,the sensitivity of strength parameters(K 1,K 2,and K 3)that are used to characterize the anisotropy strength of non-sliding failure involved in the strength criteria and confining pressure are *** results demonstrate that strength parameters K 1 and K 2 affect the strength of layered rock samples at all bedding angles except for the bedding angle of 90°and the angle range that can cause the shear sliding failure along the bedding *** strength of samples at any bedding angle decreases with increasing K 1,whereas the opposite is for K *** for bedding angles of 0°and 90°and the bedding angle range that can cause the shear sliding along the bedding plane,K 3 has an impact on the strength of rock samples with other bedding angles that the specimens'strength increases with increase of K *** addition,the strength of the rock sample increases as confining pressure ***,the uniaxial and triaxial tests of chlorite schist samples were carried out to verify and evaluate the strength criteria proposed in the *** shows that the predicted strength is in good agreement with the experimental *** test the applicability of the strength criterion,the strength data of several types of rock in the literature are ***,a comparison is made between the fitting effects of the two strength criteria and other available criteria for layered rocks.

关键词： Layered rock Strength anisotropy Strength criterion Experimental verification

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左氧氟沙星杂质N的全合成工艺

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高校化学工程学报 2024年第3期38卷 468-474页

作者：王洁利王凯罗艳娟商甜波陈彩萍章潮军沈华良沈润溥虞国棋绍兴文理学院脂溶性维生素浙江省工程研究中心浙江绍兴312000 绍兴文理学院药物制剂研究所浙江绍兴312000 浙江医药股份有限公司浙江绍兴312000

化合物((S)-(-)-2,3-二氢-3-甲基-9,10-双(4-甲基-1-哌嗪基)-7-氧代-7H-吡啶并[1,2,3-de][1,4]苯并噁嗪-6-羧酸)是抗菌药左氧氟沙星的杂质N,可作为左氧氟沙星生产过程中的杂质对照品。针对其合成难度大的问题,设计了左氧氟沙星杂质N(6)... 详细信息

化合物((S)-(-)-2,3-二氢-3-甲基-9,10-双(4-甲基-1-哌嗪基)-7-氧代-7H-吡啶并[1,2,3-de][1,4]苯并噁嗪-6-羧酸)是抗菌药左氧氟沙星的杂质N,可作为左氧氟沙星生产过程中的杂质对照品。针对其合成难度大的问题,设计了左氧氟沙星杂质N(6)的合成工艺。以左氧氟沙星中间体环合酯((S)-(-)-2,3-二氢-3-甲基-9,10-二氟-7-氧代-7H-吡啶并[1,2,3-de][1,4]苯并噁嗪-6-羧酸乙酯)(1)为原料,先在8位引入硝基,经N-甲基哌嗪的亲核取代反应得到化合物(3),再在氢氧化钠作用下水解、铁粉/氯化铵体系还原、重氮化脱除8-氨基得到目标化合物。该工艺原料易得,反应条件温和,总收率约为35.8%,解决了缺少左氧氟沙星相关研究中杂质N对照品的难题。

关键词：左氧氟沙星全合成左氧氟沙星杂质N 重氮化反应

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Structure and Material Design of High Performance Functional Refractories for High-speed Continuous Casting

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China's Refractories 2012年第1期21卷 1-5页

作者： LI Hongxia,LIU guoqi,YANG Wengang,yu Jianbin,MA Tianfei,QIAN Fan State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co. ,Ltd. ,Luoyang 471039,China State Key Laboratory of Advanced Refractories Sinosteel Luoyang Institute of Refractories Research Co. Ltd Luoyang 471039 China

Functional refractories, including submerged entry ,mzzle （SEN） , ladle shroud and monolithic stopper, are ,he key refractories for continuous casting. Drh,en by the demand （f high-speed continuous casting, traditional （unetional refractories ji,il to meet the needs of long span life, and high perfomance .[imctional refractories for continuous casting are hwreasingly required. Through structure and material ***, the performance of functional refiactories is significant5 improved. In this paper, some research adt,ances on functional refractories for continuous casting wetr mentiotted. Through numerical qmdeling and hot simulation, the service life of non-pretreating ladle shroud u,as increased front 8 h to more ＇ban 12 h. Thraugh the water modeling, the flow patterns in the mold wetr significantly improved attd through hot simulation and material design, the sen;ice liJb and eliability oJ SEN were also significantly improved.

关键词： functional refractories continuous casting hotsimulation

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着力破解农村发展党员难题——吕梁市离石区委的有益探索

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理论探索 2008年第5期 56-57页

作者：余国琦曹瑞师中共山西省委组织部太原030071

为破解农村发展党员难问题,山西省吕梁市离石区委创新发展党员模式,在区党校开办优秀农村青年培训班。主要做法是:坚持公开民主原则,严把学员入口关;实行培训班党支部、乡镇党委和村党支部三级联动"双重培养、双重管理、双重考核",把优... 详细信息

为破解农村发展党员难问题,山西省吕梁市离石区委创新发展党员模式,在区党校开办优秀农村青年培训班。主要做法是:坚持公开民主原则,严把学员入口关;实行培训班党支部、乡镇党委和村党支部三级联动"双重培养、双重管理、双重考核",把优秀农村青年培养成合格党员。此举优化了农村党员队伍结构,激发了农村青年入党的热情,为社会主义新农村建设注入了新的活力。

关键词：农村党员模式党校

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关于推进党建高端智库健康发展的几点思考

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中国延安干部学院学报 2016年第5期9卷 92-95页

作者：余国琦山西省委组织部党建研究所山西太原030071

建设党建高端智库,是党建研究的一项重要任务。智库建设要瞄准前瞻性,着眼应用性,彰显专业性,注重灵活性。前瞻性是指往远看、往前看的特性,高端智库要谋划长远、规划超前,进行超前研究,提供决策储备。应用性是要聚焦党建工作重大问题... 详细信息

建设党建高端智库,是党建研究的一项重要任务。智库建设要瞄准前瞻性,着眼应用性,彰显专业性,注重灵活性。前瞻性是指往远看、往前看的特性,高端智库要谋划长远、规划超前,进行超前研究,提供决策储备。应用性是要聚焦党建工作重大问题和热点难点问题,完成切实管用的研究成果,提出可操作性的建议。高端智库建设要注重队伍建设,打造核心团队,凸显专业特色,打造研究优势,提升专业化水平。高端智库还需要淡化行政色彩,在课题招标委托、成果评价奖励、研究方法改进、人才队伍建设和成果应用转化方面注重灵活性。

关键词：党建智库前瞻性应用性专业性灵活性

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Linear-Quadratic Pareto Cooperative Game for Mean-Field Backward Stochastic System

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Journal of Systems Science & Complexity 2024年第3期37卷 947-964页

作者： WANG yu School of Control Science and Engineering Shandong UniversityJinan 250061China

This paper focuses on a Pareto cooperative differential game with a linear mean-field backward stochastic system and a quadratic form cost functional. Based on a weighted sum optimality method, the Pareto game is equivalently converted to an optimal control problem. In the first place,the feedback form of Pareto optimal strategy is derived by virtue of decoupling technology, which is represented by four Riccati equations, a mean-field forward stochastic differential equation(MF-FSDE),and a mean-field backward stochastic differential equation(MF-BSDE). In addition, the corresponding Pareto optimal solution is further obtained. Finally, the author solves a problem in mathematical finance to illustrate the application of the theoretical results.

关键词： Backward stochastic differential equation linear-quadratic control mean-field Pareto optimality

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Topological Stability and Entropy for Certain Set-valued Maps

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Acta Mathematica Sinica,English Series 2024年第4期40卷 962-984页

作者： yu ZHANG yu Jun ZHU School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China

In this paper,the dynamics(including shadowing property,expansiveness,topological stability and entropy)of several types of upper semi-continuous set-valued maps are mainly considered from differentiable dynamical systems points of *** is shown that(1)if f is a hyperbolic endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that the induced set-valued map F_(f,U)has theε-shadowing property,and moreover,if f is an expanding endomorphism then there exists a C^(1)-neighborhood U of f such that the induced set-valued map F_(f,U)has the Lipschitz shadowing property;(2)when a set-valued map F is generated by finite expanding endomorphisms,it has the shadowing property,and moreover,if the collection of the generators has no coincidence point then F is expansive and hence is topologically stable;(3)if f is an expanding endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that h(F_(f,U,ε))=h(f);(4)when F is generated by finite expanding endomorphisms with no coincidence point,the entropy formula of F is ***,the dynamics of the set-valued maps based on discontinuous maps on the interval are also considered.

关键词： Set-valued map orbit space hyperbolic endomorphism perturbation shadowing expansiveness topological stability entropy

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A new liquid membrane diffusion model for characterizing the adsorption kinetics of europium by using a continuous measurement of adsorption platform

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Nuclear Science and Techniques 2024年第1期35卷 59-72页

作者： Hao-Qi yu Tao yu Jian-Hua Ye State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China CGN Cangnan Nuclear Power Co. Ltd.Cangnan 325800China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

To explore the kinetic adsorption under continuous and nonequilibrium states, an integration of continuous measurement and adsorption platform kinetics method was proposed, which was initially called the ICM-AP kinetics method, and a corresponding kinetic adsorption experimental method was developed. Adsorption experiments of europium(Eu) on Ca-bentonite,Na-bentonite, and the D231 cation exchange resin were performed using the ICM-AP kinetics method and continuous measurements. Because the kinetic experimental results observed in this study were different from those of traditional batch adsorption data, pseudo-first-order or pseudo-second-order kinetic models were unsuitable for fitting the experimental ***, a liquid membrane diffusion(LMD) model was developed based on the assumption of simultaneous adsorption/desorption to discuss the mechanism of kinetic adsorption. The kinetic adsorption mechanism was also studied by using *** results indicated that the proposed adsorption model can fit the experimental data more suitably, and the adsorption/desorption behaviors of Eu on bentonite and the D231 resin were simultaneously observed, suggesting that the adsorption kinetics of Eu(Ⅲ) was mainly dominated by hydrated Eu(Ⅲ) ions on the liquid membrane.

关键词： ICM-AP method LMD model Adsorption mechanism Eu(Ⅲ)

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Device design principles and bioelectronic applications for flexible organic electrochemical transistors

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International Journal of Extreme Manufacturing 2024年第1期6卷 126-153页

作者： Lin Gao Mengge Wu Xinge yu Junsheng yu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054People’s Republic of China Department of Biomedical Engineering City University of Hong KongHong Kong Special Administrative Region of ChinaPeople’s Republic of China

Organic electrochemical transistors(OECTs) exhibit significant potential for applications in healthcare and human-machine interfaces, due to their tunable synthesis, facile deposition, and excellent biocompatibility. Expanding OECTs to the fexible devices will significantly facilitate stable contact with the skin and enable more possible bioelectronic applications. In this work,we summarize the device physics of fexible OECTs, aiming to offer a foundational understanding and guidelines for material selection and device architecture. Particular attention is paid to the advanced manufacturing approaches, including photolithography and printing techniques, which establish a robust foundation for the commercialization and large-scale fabrication. And abundantly demonstrated examples ranging from biosensors, artificial synapses/neurons, to bioinspired nervous systems are summarized to highlight the considerable prospects of smart healthcare. In the end, the challenges and opportunities are proposed for fexible OECTs. The purpose of this review is not only to elaborate on the basic design principles of fexible OECTs, but also to act as a roadmap for further exploration of wearable OECTs in advanced bio-applications.

关键词： flexible organic electrochemical transistors wearable bioelectronics manufacturing approaches device physics neuromorphic applications

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A guidance and control design with reduced information for a dual-spin stabilized projectile

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Defence Technology（防务技术） 2024年第3期33卷 494-505页

作者： yu Wang Jiyan yu Xiaoming Wang Jia Fangxiu Intelligent Ammunition Technology National Defense Key Discipline Laboratory Nanjing University of Science and TechnologyNanjingJiangsu210094China

In this paper,an integrated guidance and control method based on an adaptive path-following controller is proposed to control a spin-stabilized projectile with only translational motion information under the constraint of an actuator,uncertainties in aerodynamic parameters and measurements,and control system *** to the fairly high rotation speed,the dynamic model of this missile is strongly nonlinear,uncertain and coupled in pitch,yaw and roll channels.A theoretical equivalent resultant force and uncertainty compensation method are comprehensively used to realize decoupling of pitch and *** response to the strong nonlinear and time-varying characteristics of the dynamic system,the quasi-linear model whose parameters are obtained by interpolation of points selected as the segmentation points in the trajectory envelope,is used for calculation in each *** cope with the system uncertainty caused by model approximation,parameter uncertainty and ballistic interference,an extended state estimator is used to compensate the output feedback according to the test ballistic *** order to improve the tracking efficiency and ensure the tracking error convergence with only translational motion information,the virtual guide point,whose derivative is deduced according to the Lyapunov principle,is calculated in real time according to the projection relationship between the real-time position and the reference trajectory,and a virtual line-of-sight angle and the backstepping method are used for the design of the guidance and control *** order to avoid the influence of control input saturation on the guidance and control performance due to the actuator limitation and improve the robustness of the system,an anti-saturation compensator is designed according to the two-step *** feasibility and effectiveness of the path-following controller is verified through closed-loop flight simulations with measurement,control,and condition *** result

关键词： Spin-stabilized projectile Reduced information Path-following control Extended state observer Coupled nonlinear system Input saturation

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