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Virtual multi-dimensional internal bonds model and its application in simulation of rock mass

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Science china(Technological Sciences) 2008年第2期51卷 192-201页

作者： zhang ZhenNan1,2 & GE XiuRun3,4 1 department of Civil engineering,shanghai university,shanghai 200072,china 2 shanghai Institute of Applied Mathematics and Mechanics,shanghai university,shanghai 200072, china 3 Institute of geotechnical engineering,shanghai Jiao Tong university,shanghai 200030,china 4 Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,china department of Civil engineering Shanghai University Shanghai China shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai China Institute of geotechnical engineering Shanghai Jiao Tong University Shanghai China Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China

VMIB (virtual multi-dimensional internal bonds) is a multiscale mechanical model developed from the VIB (virtual internal bond) theory. In VIB theory,the solid mate-rial is considered to consist of random-distributed material particles in microscale. These particles are connected with normal bonds. The macro constitutive relation is derived from the cohesive law between particles. However,in VMIB,the micro particles are connected with both normal and shear bonds. The macro constitutive relation is derived in terms of bond stiffness coefficients. It has been theoretically certified that there exists a corresponding relationship between the two bond stiffness coefficients and the two macro material constants,i.e. the Young’s modulus and Poisson ratio. This corresponding relationship suggests that it should be necessary and sufficient to simultaneously account for the normal and shear interactions between particles. Due to the fact that the fracture criterion is directly incorporated into the constitutive relation,both VIB and VMIB present many advantages in simulating fractures of materials. In the damage model of rock mass,a damage tensor is usually defined to describe the distribution of cracks. The damage value in one direction determines the relative stiffness of rock mass in this direction. In VMIB solid,the relative distribution density of micro bonds in one direction determines the relative macro stiffness of the material in this direction. The effects of the damage value and the relative distribution density of bonds are consistent. To simulate the failure behavior of rock mass with VMIB,the presented paper sets up a quantitative relationship between the damage tensor and the rela-tive distribution density of bonds. Comparison of the theoretical and the experi-mental results shows that VMIB model can represent the effect of distributed cracks on rock mass with this relationship. The presented work provides a founda-tion for further simulating fracture behavior

关键词： VMIB (virtual multi-dimensional internal bonds) rock mass VIB (virtual internal bonds) multi-cracked body numerical simulation

Erratum to:Aberrant dynamic functional connectivity of thalamocortical circuitry in major depressive disorder

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Journal of Zhejiang university-Science B(Biomedicine & Biotechnology) 2024年第9期25卷 801-802页

作者： Weihao ZHENG Qin zhang Ziyang zhao Pengfei zhang Leilei zhao Xiaomin wang Songyu YANG Jing zhang Zhijun YAO Bin HU Gansu Provincial Key Laboratory of Wearable Computing School of Information Science and EngineeringLanzhou UniversityLanzhou730000China Second Clinical School Lanzhou UniversityLanzhou730030China department of Magnetic Resonance Lanzhou University Second HospitalLanzhou730030China Gansu Province Clinical Research Center for Functional and Molecular Imaging Lanzhou730030China School of Medical Technology Beijing Institute of TechnologyBeijing100081China CAS Center for Excellence in Brain Science and Intelligence Technology Shanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai200031China Joint Research Center for Cognitive Neurosensor Technology of Lanzhou university&Institute of Semiconductors Chinese Academy of SciencesLanzhou730000China

The article(Zheng et al.,2024)unfortunately contained a mistake:in Table 3,four"I"elements in the last"LF in thalamus"column are *** four arrows should be"↑"in the following correctversion of Table3.

关键词： connectivity mistake dynamic

Noise-Tolerant ZNN-Based Data-Driven Iterative Learning Control for Discrete Nonaffine Nonlinear MIMO Repetitive Systems

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 344-361页

作者： Yunfeng Hu Chong zhang Bo wang Jing zhao Xun Gong Jinwu Gao Hong Chen State Key Laboratory of Automotive Simulation and Control Jilin UniversityJilin UniversityChangchun 130025China College of Communication engineering Jilin UniversityJilin UniversityChangchun 130025China department of Electromechanical engineering University of MacaoMacao 999078China School of Artificial Intelligence Jilin UniversityChangchun 130012China IEEE College of Electronics and Information engineering Tongji UniversityShanghai 200092China

Aiming at the tracking problem of a class of discrete nonaffine nonlinear multi-input multi-output(MIMO) repetitive systems subjected to separable and nonseparable disturbances, a novel data-driven iterative learning control(ILC) scheme based on the zeroing neural networks(ZNNs) is proposed. First, the equivalent dynamic linearization data model is obtained by means of dynamic linearization technology, which exists theoretically in the iteration domain. Then, the iterative extended state observer(IESO) is developed to estimate the disturbance and the coupling between systems, and the decoupled dynamic linearization model is obtained for the purpose of controller synthesis. To solve the zero-seeking tracking problem with inherent tolerance of noise,an ILC based on noise-tolerant modified ZNN is proposed. The strict assumptions imposed on the initialization conditions of each iteration in the existing ILC methods can be absolutely removed with our method. In addition, theoretical analysis indicates that the modified ZNN can converge to the exact solution of the zero-seeking tracking problem. Finally, a generalized example and an application-oriented example are presented to verify the effectiveness and superiority of the proposed process.

关键词： Adaptive control control system synthesis data-driven iterative learning control neurocontroller nonlinear discrete time systems

Current Immunotherapy Strategies for Rheumatoid Arthritis:The Immunoengineering and Delivery Systems

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Research 2024年第3期2023卷 169-189页

作者： Chenyu zhang Peixiang Ma An Qin Liao wang Kerong Dai Yuanyuan Liu Jie zhao Zuyan Lu School of Medicine Shanghai UniversityShanghaiChina Clinical and Translational Research Center for 3D Printing Technology Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina shanghai Key Laboratory of Orthopedic Implants Department of Orthopedic SurgeryShanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina shanghai Frontiers Science Center of Degeneration and Regeneration in Skeletal System ShanghaiChina.

Rheumatoid arthritis (RA) is a chronic inflammatory autoimmune disease accompanied by persistent multiarticular synovitis and cartilage degradation. The present clinical treatments are limited to disease-modifying anti-rheumatic drugs (DMARDs) and aims to relieve pain and control the inflammation of RA. Despite considerable advances in the research of RA, the employment of current clinical procedure is enormous, hindered by systemic side effect, frequent administration, tolerance from long-lasting administration, and high costs. Emerging immunoengineering-based strategies, such as multiple immune-active nanotechnologies via mechanism-based immunology approaches, have been developed to improve specific targeting and to reduce adverse reactions for RA treatments. Here, we review recent studies in immunoengineering for the treatment of RA. The prospect of future immunoengineering treatment for RA has also been discussed.

关键词： drugs Rheumatoid treatment

Comparison of energy structure and spectral properties of Ce:LaAlO_3 and Ce:Lu_2(SiO_4)O

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Science china(Technological Sciences) 2009年第12期52卷 3678-3682页

作者： wang XiaoDan 1 ,PAN Tao 1 ,ZANG TaoCheng 1 ,LI JianKang 1 ,zhao ZhiWei 2 ,zhang LianHan 2 &XU Jun3 1department of Applied Physics,university of Science and Technology of Suzhou,Suzhou 215009,china 2shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,shanghai 201800,china 3shanghai Institute of Ceramics,Chinese Academy of Sciences,shanghai 201800,china department of Applied Physics University of Science and Technology of Suzhou Suzhou China shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai China

Undoped LaAlO3 and 1 at.%Ce:LaAlO3 single crystals were grown by the Czochralski *** and fluorescence spectra were measured at room *** energy levels structure of Ce:LaAlO3 was *** this paper,two viewpoints were *** first one is:the energy levels structure of Ce:LaAlO3 is very similar to that of Ce:Lu2(SiO4)O which is a well-known *** the energy levels structure of Ce:LaAlO3 and Ce:Lu2(SiO4)O,the lowest 5d energy level of Ce 3+ is located below the bottom of the conduction band of host crystal and the other higher 5d energy levels of Ce 3+ are located above the bottom of the conduction band of host *** second one is:Ce:LaAlO3 single crystal may not be suitable for scintillation application;by comparing the energy levels structures of Ce:LaAlO3 and Ce:Lu2(SiO4)O,the large energy difference(1.13 eV)between the two lowest 5d energy levels of Ce 3+ in LaAlO3 is a crucial factor that causes the luminescence quenching.

关键词： Ce:LaAlO3 Ce:Lu2(SiO4)O energy-level absorption luminescence

DLX3(Q178R)mutation delays osteogenic differentiation via H19/miR-29c-3p/KDM5B axis in TDO-iPSCs-derived MSCs

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Genes & Diseases 2024年第4期11卷 49-52页

作者： Liying Dong Na zhao Dongmei wang Meng wang Yixin zhang Liangjie Sun Chong Ding Yixiang wang Zeyun Ma Central Laboratory Peking University School and Hospital of StomatologyBeijing 100081China department of Oral and Maxillofacial Surgery Peking University School and Hospital of StomatologyBeijing 100081China National engineering Laboratory for Digital and Material Technology of Stomatology Peking University School and Hospital of StomatologyBeijing 100081China Beijing Key Laboratory of Digital Stomatology Peking University School and Hospital of StomatologyBeijing 100081China The Second Clinical Division Peking University School and Hospital of StomatologyBeijing 100081China department of VIP Service Peking University School and Hospital of StomatologyBeijing 100081China department of Restorative Dentistry and Biomaterials Sciences Harvard School of Dental MedicineBostonMA 02115USA department of Prosthodontics Fudan UniversityShanghai 200001China shanghai Key Laboratory of Craniomaxillofacial Development and Diseases Shanghai Stomatological HospitalFudan UniversityShanghai 200001China

Tricho-dento-osseous(TDO)syndrome is a rare autosomal dominant disease resulting from distal-less homeobox 3(DLX3)mutation.1,2 Accumulative bone density in alveolar bone is a clinically favorable phenotype for TDO ***... 详细信息

关键词： patients clinically alveolar

Investigation of ultraviolet response enhanced PV cell with silicon-based SINP configuration

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Science china(Technological Sciences) 2010年第4期53卷 1028-1037页

作者： HE Bo1,MA ZhongQuan1,zhao Lei1,zhang NanSheng1,LI Feng1,SHEN Cheng1,SHEN Ling1,ZHOU ChengYue1,YU ZhengShan2 & YIN YanTing2 1 SHU-Solar E PV Laboratory,department of Physics,shanghai university,shanghai 200444,china 2 Solar Enertech Corp.,shanghai 201206,china SHU-Solar E PV Laboratory Department of Physics Shanghai University Shanghai China Solar Enertech Corp. Shanghai China

In this study,we report on the realization of ultraviolet response enhancement in PV cells through the structure of ITO/SiO2/np-Silicon frame(named as SINP),which was fabricated by the state of the art *** fabrication process consists of thermal diffusion of phosphorus element into p-type texturized crystal Si wafer,thermal deposition of an ultra-thin silicon dioxide layer(15-20) at low temperature,and subsequent deposition of thick In2O3:SnO2(ITO) layer by RF *** structure,morphology,optical and electric properties of the ITO film were characterized by XRD,SEM,UV-VIS spectrophotometer and Hall effect measurement,*** results showed that ITO film possesses high quality in terms of antireflection and electrode *** device parameters derived from current-voltage(I-V) relationship under different conditions,spectral response and responsivity of the ultraviolet photoelectric cell with SINP configuration were analyzed in *** found that the main feature of our PV cell is the enhanced ultraviolet response and optoelectronic *** improved short-circuit current,open-circuit voltage,and filled factor indicate that the device is promising to be developed into an ultraviolet and blue enhanced photovoltaic device in the future.

关键词： ITO SINP photovoltaic device current-voltage(I-V) characteristics spectral response responsivity

Tetrandrine inhibits Ca2+-activated chloride channel in cultured human umbilical vein endothelial cells

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Acta Pharmacologica Sinica 2004年第3期25卷 73-79页

作者： Qi-zhi FANG1,2,Ning ZHONG1,3,Yi zhang1,zhao-nian ZHOU1,4 1Physiological Lab of Hypoxia,shanghai Institute of BiologicalSciences,Chinese Academy ofSciences,shanghai200031,china 3department of Molecular and Cell Biology,university of California at Berkeley,Berkeley,CA 94720,USA 2 Now in CardiovascularResearch Institute,university of Cali- fornia at San Francisco,San Francisco,CA 94143,USA Physiological Laboratory of Hypoxia Shanghai Institutes for Biological Sciences Chinese Academy of Sciences 上海 200031

AIM: To characterize the electrophysiological and kinetic properties of Ca2+-activated chloride channel (CaCC) in cultured human umbilical vein endothelial cell line (HUVEC), and test the inhibitory effects of tetrandrine (Tet) on CaCC. METHODS: Ca2+-activated Cl- currents (ICl,Ca) were recorded by patch-clamp whole cell configurations. [Ca2+]i was measured via intracellular Fura-2 fluorescence intensities. RESULTS: ICl,Ca was activated by increasing [Ca2+]i via direct elevation of intracellular calcium. ICl,Ca showed an apparent outward rectification properties, and it was activated in a voltage- and calcium-dependent mode. Tet dose-dependently inhibited ICl,Ca, the IC50 was (5.2±0.4) μmol/L (n=8 cells). Tet suppressed both voltage-dependent and calcium-dependent activation of ICl,Ca. The activa- tion time constant was (326±12) ms [in the presence of 10 μmol/L Tet, compared to control (175±17) ms, at +100 mV], and Ca2+ concentration for half maximal activation was (387±61) nmol/L for Tet (compared to control (287±36) nmol/L. CONCLUSIONS: Tet effectively blocked ICl,Ca, and such effects might be due to its inhibitory effects on the activation process of Ca2+-activated chloride channel.

关键词： chloride channels endothelium tetrandrine patch-clamp techniques calcium

Identification and Characterization of a Rat Novel Gene RSEP4 Expressed Specifically in Central Nervous System

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Acta Biochimica et Biophysica Sinica 2004年第7期36卷 501-507页

作者： Xi-Dao wang1,2, Ling-Wei KONG1, Zhi-Qin XIE1, Yu-Qiu zhang3, Zhi-Xin LIN2, Zhi-Qi zhao3,Lei YU4, and Nai-He JING1* 1 Laboratory of Molecular Cell Biology, Laboratory of Stem Cell Biology, Institute of Biochemistry and Cell Biology, shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, shanghai 200031, china School of Life Science and Biotechnology, 2 shanghai Jiaotong university, shanghai 200030, china Institute of Neurobiology, Fudan university, shanghai 200433, china 3 4 department of Cell Biology, Neurobiology and Anatomy, College of Medicine, university of Cincinnati, Cincinnati, Ohio, USA Laboratory of Molecular Cell Biology Laboratory of Stem Cell Biology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Graduate School of the Chinese Academy of SciencesShanghai 200031 China School of Life Science and Biotechnology Shanghai Jiaotong UniversityShanghai 200030 China Institute of Neurobiology Fudan UniversityShanghai 200433 China department of Cell Biology Neurobiology and Anatomy College of Medicine University of CincinnatiCincinnati Ohio USA

The low-abundantly expressed genes composed the majorities of the mRNAs expressed in the central nervous system (CNS), and were thought to be important for the normal brain functions. Through differential screening a low-abundance cDNA sublibrary with mRNA from neuropathic pain of chronic constriction injury (CCI) model, we have identified a novel rat gene, rat spinal-cord expression protein 4 gene (RSEP4). The total length of RSEP4 cDNA is 2006 bp, with a 501 nucleotide open reading frame (ORF) that encodes a 167 amino acid polypeptide. Northern blot revealed that RSEP4 was expressed specifically in the CNS. In situ hybridization showed that the mRNA of RSEP4 was strongly expressed in the CA1, CA2, CA3 and DG regions of hippocampus, the Purkinje cells of cerebellum, and the small sensory neurons of dorsal horn and large motor neurons of ventral horn of spinal cord. Over-expression of RSEP4-EGFP fusion protein in the human embryonic kidney 293T cells showed that RSEP4 protein was mainly localized in the cell cytoplasm. These results suggest that RSEP4 may play some roles in the CNS.

关键词： central nervous system (CNS) rat Northern blot in situ hybridization