检索结果-南通市图书馆

Chinese Chemical Letters 2024年第2期35卷 370-373页

作者： Tangxin Xiao Xiuxiu li liangliang Zhang Kai Diao zheng-yi li Xiao-Qiang Sun Leyong Wang Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Stepwise energy transfer is ubiquitous in natural photosynthesis,which greatly promotes the widespread use of solar ***,we constructed a supramolecular light harvesting system based on sequential energy transfer through the hierarchical self-assembly of M,which contains a cyanostilbene core flanked by two ureidopyrimidinone motifs,endowing itself with both aggregation-induced emission behavior and quadruple hydrogen bonding *** monomer M can self-assemble into hydrogen bonded polymers and then form supramolecular polymeric nanoparticles in water through a mini-emulsion *** nanoparticles were further utilized to encapsulate the relay acceptor ESY and the final acceptor NDI to form a two-step FRET *** fluorescence including a white-light emission was successfully *** work not only shows a desirable way for the fabrication of efficient two-step light harvesting systems,but also shows great potential in tunable photoluminescent nanomaterials.

关键词： light harvesting system Supramolecular polymer Quadruple hydrogen bonding AIE Self-assembly

NFSI-catalyzed S–S bond exchange reaction for the synthesis of unsymmetrical disulfides

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第9期33卷 4269-4272页

作者： Mengjie Song Qingyue Hu zheng-yi li Xiaoqiang Sun Ke Yang Jiangsu Key Laboratory of Advanced Catalytic Materials&Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Institute of Urban&Rural Mining Changzhou UniversityChangzhou 213164China

The metal-free S–S bond exchange reaction of symmetrical disulfides catalyzed by NFSI is described. This novel protocol provides a facile and efficient approach to accessing important unsymmetrical ***, this strategy could also be utilized in the late-stage functionalization of amino acids, drugs,and natural products. The broad substrate scope, good functional group tolerance and easy accessibility of catalyst indicate that this strategy affords a green and practical complementary method to various unsymmetrical disulfides.

关键词： Metal-free Ssingle bond S bond exchange NFSI Unsymmetrical disulfides Organic synthesis

Supramolecular interaction controlled and calix[4]arene ligand assisted Pd-catalyzed C(sp3)-H arylation of aliphatic aldehydes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第12期33卷 5116-5119页

作者： Yao Wu Zhiyan Ma Jing Shi Xiaoqiang Sun Ke Yang zheng-yi li Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China

A calix[4]arene ligand assisted directβ-C-H arylation of tertiary aliphatic aldehydes has been developed via a Pd-catalyzed C(sp3)-H functionalization *** strategy exhibited good functional group compatibility and C-H bond *** studies have shown that both synergistic effect and cationic-πsupramolecular interaction between calixarene cavity and transition-metal catalytic center may play an important role in this catalytic *** complementary method would be used in organic and medical chemistry due to the importance of tertiary aliphatic aldehydes.

关键词： Supramolecular interaction Palladium-catalyzed C-H activation Calixarene Aliphatic aldehyde

Subsection and superposition method for reservoir formation damage evaluation of complex-structure wells

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第3期20卷 1843-1856页

作者： Guan-Cheng Jiang yi-zheng li yin-Bo He Teng-Fei Dong Ke-Ming Sheng Zhe Sun Collge of Petroleum Engineering China University of Petroleum(Beijing)Bejing102249China State Key Laboratory of Petroleum Resources and Prospecting MOE Key Laboratory of Petroleum EngineeringChina Universityof Petroleum(Beijing)Beijing102249China College of Artificial Intelligence China University of Petroleum(Bejing)Beijing102249China Calgary Centre for Innovative Technology University of CalgaryCalgaryAB T2N 1N4Canada National Engineering Research Center of Oil&Gas Drilling and Completion Technology

Kinds of complex-structure wells can effectively improve production,which are widely ***,in the process of drilling and completion,complex-structure wells with long drilling cycle and large exposed area of reservoir can lead to the fact that reservoir near wellbore is more vulnerable to the working fluid invasion,resulting in more serious formation *** order to quantitatively describe the reservoir formation damage in the construction of complex-structure well,taking the inclined well section as the research object,the coordinate transformation method and conformal transformation method are given according to the flow characteristics of reservoir near wellbore in anisotropic *** the local skin factor in orthogonal plane of wellbore is *** the un-even distribution of local skin factor along the wellbore,the oscillation decreasing model and empirical equation model of damage zone radius distribution along the wellbore direction are established and then the total skin factor model of the whole well is superimposed to realize the reservoir damage evaluation of complex-structure *** the skin factor model with the production model,the production of complex-structure wells can be predicted more *** two field application cases show that the accuracy of the model can be more than 90%,which can also fully reflect the invasion characteristics of drilling and completion fluid in any well section of complex-structure wells in anisotropic reservoir,so as to further provide guidance for the scientific establish-ment of reservoir production system.

关键词： Complex-structure wells Reservoir formation damage Reservoir anisotropy Skin factor Production prediction model

Distributed Economic MPC for Synergetic Regulation of the Voltage of an Island DC Micro-Grid

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 734-745页

作者： yi zheng Yanye Wang Xun Meng Shaoyuan li Hao Chen IEEE the Department of Automation Shanghai Jiao Tong UniversityShanghai 200240 the Key Laboratory of System Control and Information Processing Ministry of Education of ChinaShanghai 200240China Haixi Institutes Chinese Academy of SciencesJinjiang 362216China

In this paper,distributed model predictive control(DMPC) for island DC micro-grids(MG) with wind/photovoltaic(PV)/battery power is proposed,which coordinates all distributed generations(DG) to stabilize the bus voltage together with the insurance of having computational efficiency under a real-time *** on the feedback of the bus voltage,the deviation of the current is dispatched to each DG according to cost over the prediction ***,to avoid the excessive fluctuation of the battery power,both the discharge-charge switching times and costs are considered in the model predictive control(MPC) optimization problems.A Lyapunov constraint with a time-varying steady-state is designed in each local MPC to guarantee the stabilization of the entire *** voltage stabilization of the MG is achieved by this strategy with the cooperation of *** numeric results of applying the proposed method to a MG of the Shanghai Power Supply Company shows the effectiveness of the distributed economic MPC.

关键词： Distributed model predictive control(DMPC) Lyapunovbased model predictive control micro-grid(MG) voltage control

Overview of Torque Ripple Minimization Methods for Permanent Magnet Synchronous Motors Based on Harmonic Injection

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2024年第2期10卷 16-29页

作者： Peng yi Wenzhi zheng Xianglin li College of Electrical Engineering Qingdao UniversityQingdao 266071China

Permanent magnet synchronous motors(PMSMs)are widely used because of their high power/torque density and high efficiency,particularly in applications with strict requirements for arrangement space or weight,such as in the electric vehicle(EV)and aerospace ***,the PMSM torque ripple problem has received increasing interest because PMSM drive requirements continuously *** applications with complex transmission and a wide speed range,torque ripple can easily cause system resonance,which deteriorates the driving *** research status and latest progress in the minimization of PMSM torque ripple based on harmonic injection are ***,the causes of PMSM torque ripple are ***,the research status of the PMSM analytical model is introduced,and multiple current harmonic control and optimization methods are described in ***,future development trends in this field are analyzed.

关键词： Permanent magnet synchronous motor torque ripple minimization harmonic injection

Chiral thermally activated delayed fluorescence materials for circularly polarized organic light-emitting diodes

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

Science China Chemistry 2024年第4期67卷 1097-1116页

作者： li Yuan yi-Pin Zhang You-Xuan zheng State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Chirality is an important natural characteristic of organic molecules,and chiral organic molecules have shown extensive application in areas such as pharmaceutical development and material *** from the ability to achieve circularly polarized luminescence(CPL),chiral luminescent materials have shown potential applications in anti-glare display,optical communication and,3D display,*** to the ability to harvest both singlet and triplet excitons by a fast reverse intersystem crossing process without involving noble metals,chiral thermally activated delayed fluorescence(TADF)materials with point chirality,axial chirality,planar chirality and helical chirality are regarded as the state-of-the-art materials for circularly polarized organic light-emitting diodes(CP-OLEDs).In recent years,the chiral TADF materials and CP-OLEDs have rapidly developed,but unfortunately,the dissymmetry factors(g)are far from the requirement of practical *** ideal emitters and devices should have both high efficiency and a g factor,or at least a balance between these two *** review gives an overview of recent progress in chiral TADF materials,with a particular focus on the chiral skeleton,CPL property and device ***,the molecular design concept,device structure and methods to improve the g factors of chiral materials and CP-OLEDs are also discussed.

关键词： chiral thermally activated delayed fluorescence material chiral skeleton circularly polarized luminescence circularly polarized organic light-emitting diodes dissymmetry factor

同方期刊数据库

The Logarithmic Sobolev Inequality for a Submanifold in Manifolds with Nonnegative Sectional Curvature

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2024年第3期45卷 487-496页

作者： Chengyang yi Yu zheng School of Mathematical Sciences East China Normal UniversityShanghai 200241China

The authors prove a sharp logarithmic Sobolev inequality which holds for compact submanifolds without boundary in Riemannian manifolds with nonnegative sectional curvature of arbitrary dimension and *** the Michael-Simon Sobolev inequality,this inequality includes a term involving the mean *** extends a recent result of Brendle with Euclidean setting.

关键词： Logarithmic Sobolev inequality Nonnegative sectional curvature Submanifold

WNT7A promotes tumorigenesis of head and neck squamous cell carcinoma via activating FZD7/JAK1/STAT3 signaling

在线全文

学校读者我要写书评

暂无评论

International Journal of Oral Science 2024年第1期16卷 85-96页

作者： Qingling Huang yi Xiao Ting Lan Youguang Lu li Huang Dali zheng Department of Biochemistry and Molecular Biology School of Basic Medical SciencesFujian Medical UniversityFuzhouChina Fujian Key Laboratory of Oral Diseases School and Hospital of StomatologyFujian Medical UniversityFuzhouChina Department of Preventive Dentistry School and Hospital of StomatologyFujian Medical UniversityFuzhouChina Department of Dentistry The First Affiliated Hospital of Fujian Medical UniversityFuzhouChina

Wnt signaling are critical pathway involved in organ development, tumorigenesis, and cancer progression. WNT7A, a member of the Wnt family, remains poorly understood in terms of its role and the underlying molecular mechanisms it entails in head and neck squamous cell carcinoma (HNSCC). According to the Cancer Genome Atlas (TCGA), transcriptome sequencing data of HNSCC, the expression level of WNT7A in tumors was found to be higher than in adjacent normal tissues, which was validated using Real-time RT-PCR and immunohistochemistry. Unexpectedly, overexpression of WNT7A did not activate the canonical Wnt-β-catenin pathway in HNSCC. Instead, our findings suggested that WNT7A potentially activated the FZD7/JAK1/STAT3 signaling pathway, leading to enhanced cell proliferation, self-renewal, and resistance to apoptosis. Furthermore, in a patient-derived xenograft (PDX) tumor model, high expression of WNT7A and phosphorylated STAT3 was observed, which positively correlated with tumor *** findings underscore the significance of WNT7A in HNSCC progression and propose the targeting of key molecules within the FZD7/JAK1/STAT3 pathway as a promising strategy for precise treatment of HNSCC.

关键词： WNT squamous tumorigenesis

Icariin accelerates bone regeneration by inducing osteogenesisangiogenesis coupling in rats with type 1 diabetes mellitus

在线全文

学校读者我要写书评

暂无评论

World Journal of Diabetes 2024年第4期15卷 769-782页

作者： Sheng zheng Guan-Yu Hu Jun-Hua li Jia zheng yi-Kai li Department of Traditional Chinese Orthopedics and Traumatology Center for Orthopedic SurgeryThe Third Affiliated Hospital of Southern Medical UniversityGuangzhou 510630Guangdong ProvinceChina School of Traditional Chinese Medicine Southern Medical UniversityGuangzhou 510515Guangdong ProvinceChina Department of Endocrinology Peking University First HospitalBeijing 100034China

BACKGROUND Icariin(ICA),a natural flavonoid compound monomer,has multiple pharmacological ***,its effect on bone defect in the context of type 1 diabetes mellitus(T1DM)has not yet been *** To explore the role and potential mechanism of ICA on bone defect in the context of *** The effects of ICA on osteogenesis and angiogenesis were evaluated by alkaline phosphatase staining,alizarin red S staining,quantitative real-time polymerase chain reaction,Western blot,and ***-related assays were conducted to investigate the relationship between osteogenesis and angiogenesis.A bone defect model was established in T1DM *** model rats were then treated with ICA or placebo and micron-scale computed tomography,histomorphometry,histology,and sequential fluorescent labeling were used to evaluate the effect of ICA on bone formation in the defect *** ICA promoted bone marrow mesenchymal stem cell(BMSC)proliferation and osteogenic *** ICA treated-BMSCs showed higher expression levels of osteogenesis-related markers(alkaline phosphatase and osteocalcin)and angiogenesis-related markers(vascular endothelial growth factor A and platelet endothelial cell adhesion molecule 1)compared to the untreated *** was also found to induce osteogenesis-angiogenesis coupling of *** the bone defect model T1DM rats,ICA facilitated bone formation and CD31hiEMCNhi type H-positive capillary ***,ICA effectively accelerated the rate of bone formation in the defect *** ICA was able to accelerate bone regeneration in a T1DM rat model by inducing osteogenesis-angiogenesis coupling of BMSCs.

关键词： Icariin Osteogenesis-angiogenesis coupling Type 1 diabetes mellitus Bone defect Bone regeneration