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Analysis on vibration characteristics of large-size rectangular piezoelectric composite plate based on quasi-periodic phononic crystal structure

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Chinese Physics B 2022年第5期31卷 438-447页

作者： Li-Qing Hu sha wang Shu-yu Lin shaanxi Key Laboratory of Ultrasonics Institute of Applied AcousticsShaanxi Normal UniversityXi’an 710119China

Based on the theory of composite materials and phononic crystals(PCs),a large-size rectangular piezoelectric composite plate with the quasi-periodic PC structure composed of PZT-4 and epoxy is proposed in this *** PC structure can suppress the transverse vibration of the piezoelectric composite plate so that the thickness mode is purer and the thickness vibration amplitude is more ***,the vibration of the model is analyzed theoretically,the electromechanical equivalent circuit diagram of three-dimensional coupled vibration is established,and the resonance frequency equation is *** effects of the length,width,and thickness of the piezoelectric composite plate at the resonant frequency are obtained by the analytical method and the finite element method,the effective electromechanical coupling coefficient is also *** results show that the resonant frequency can be changed regularly and the electromechanical conversion can be improved by adjusting the size of the rectangular piezoelectric *** effect of the volume fraction of the scatterer on the resonant frequency in the thickness direction is studied by the finite element *** band gap in X and Y directions of large-size rectangular piezoelectric plate with quasi-periodic PC structures are *** results show that the theoretical results are in good agreement with the simulation *** the resonance frequency is in the band gap,the decoupling phenomenon occurs,and then the vibration mode in the thickness direction is purer.

关键词： composite materials rectangular piezoelectric plate coupled vibration band gap

Failure of Placebo Analgesia Model in Rats with Inflammatory Pain

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Neuroscience Bulletin 2020年第2期36卷 121-133页

作者： Xiang-sha Yin Jin-yu Yang Shuai Cao yun wang Department of Neurobiology School of Basic Medical Sciences and Neuroscience Research InstituteKey Laboratory for NeuroscienceMinistry of Education of Chinaand National Health CommissionState key Laboratory of Natural and Biomimetic DrugsPeking UniversityBeijing 100083China PKU-IDG/McGovern Institute for Brain Research Peking UniversityBeijing 100871China

With the shifting role of placebos,there is a need to develop animal models of placebo analgesia and elucidate the mechanisms underlying the *** the present study,male Sprague-Dawley rats with chronic inflammatory pain caused by complete Freund’s adjuvant(CFA)underwent a series of conditioning procedures,in which morphine was associated with different cues,but they failed to induce placebo ***,conditioning with the conditioned place preference apparatus successfully induced analgesic expectancy and placebo analgesia in naive rats but only induced analgesic expectancy and no analgesic effect in CFA ***,we found enhanced c-fos expression in the nucleus accumbens and reduced expression in the anterior cingulate cortex in naive rats while c-fos expression in the anterior cingulate cortex in CFA rats was not *** summary,the behavioral conditioning model demonstrated the difficulty of establishing a placebo analgesia model in rats with a pathological condition.

关键词： Placebo analgesia Morphine Conditioning Inflammatory pain Rat

应对供应中断风险下消费者恐慌囤货行为:涨价策略与限购策略

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管理工程学报 2025年第2期39卷 118-129页

作者：郑锐王宇鲍丽娜武汉理工大学安全科学与应急管理学院武汉理工大学中国应急管理研究中心浙江大学管理学院

本文研究了零售商应对供应中断风险下消费者恐慌囤货行为的涨价策略与限购策略。研究模型考虑一个垄断零售商在两个订货周期内向市场销售一种生活必需品,第二期的供应中断风险可能导致消费者在第一期发生恐慌囤货。研究基于对消费者恐... 详细信息

本文研究了零售商应对供应中断风险下消费者恐慌囤货行为的涨价策略与限购策略。研究模型考虑一个垄断零售商在两个订货周期内向市场销售一种生活必需品,第二期的供应中断风险可能导致消费者在第一期发生恐慌囤货。研究基于对消费者恐慌囤货决策模型的刻画,分析了消费者恐慌囤货行为如何影响零售商利润以及社会总福利,然后进一步分析了零售商分别在什么条件下应采取涨价策略或限购策略以及这些策略将如何影响社会总福利。研究结果表明:(1)当零售商拥有足够的库存时,一定程度的恐慌囤货可以增加零售商利润和社会总福利;而当恐慌囤货导致零售商严重缺货时,恐慌囤货将损害零售商利润和社会总福利。(2)当零售商需要采取策略应对消费者恐慌囤货行为时,存在一个消费者恐慌强度的阈值,当恐慌强度低于阈值时,零售商应采取涨价策略调节消费者的囤货需求;当恐慌强度高于阈值时,零售商应采取限购策略限制消费者的囤货。(3)零售商不同的应对策略对社会总福利有不同的影响,当恐慌强度非常高时,采取限购策略可以显著改善社会总福利;采取涨价策略可以提高零售商的备货动机,在一定条件下可以改善社会总福利。

关键词：供应链管理供应中断风险恐慌囤货需求管理限购策略

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Palladium installed copper-organic framework for C–C coupling reactions

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Science China Chemistry 2025年

作者： yu-Mei wang Mei-Xia Tao Kai-Ming Mo Xu Chen Shu-Hua Zhong Elena S Shubina Guo-Hong Ning Dan Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Supramolecular Coordination ChemistryJinan University A.N.Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences

The formation of C–C bonds is a crucial aspect of organic synthesis. Synthesists' long-term objective is to identify novel catalysts to optimize reaction systems based on traditional transition metal catalysis. This study explores the synthesis and catalytic potential of palladium-installed covalent metal-organic frameworks(CMOFs) based on copper cyclic trinuclear units(Cu-CTUs). By incorporating palladium ions into the imine-based framework JNM-7 through a straightforward immersion method, we achieved a notable enhancement in catalytic activity for critical C–C coupling reactions, including C–H arylation and Sonogashira cross-coupling. The resulting JNM-7-Pd demonstrated remarkable stability and recyclability, maintaining its efficiency over at least three cycles without any decline in efficiency.

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Investigation on catalytic distillation for ethyl acetate production with different catalytic packing structures

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Chinese Journal of Chemical Engineering 2023年第1期53卷 63-72页

作者： Zhiwei wang yu Zhang Zhi Zhang Daowei Zhou Zhikai Cao Yong sha Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

The catalytic packing is the core component of the catalytic distillation,and how the catalyst exists in the packing has significant influence on the *** investigate the effect of catalyst packings on the catalytic distillation process,the classical ethyl acetate reactive distillation system was utilized,and a supported catalytic packing(SCP)was prepared in comparison with the conventional tea-bag catalytic packing(TBP).Laboratory scale experiments showed that the ethyl acetate conversion of the SCP was superior to the TBP at a low catalyst *** effects of reaction kinetics,mass transfer performance and actual catalytic efficiency of the packings on this process were regarded as reasons and studied by combining the experiments and numerical *** suggested that the relatively immediate“in-situ separation”caused by the rapid reaction kinetics and better mass transfer performance of SCP may be a main reason for the difference of the conversion.

关键词： Catalytic packing Ethyl acetate Catalytic distillation Mass transfer Esterification Reaction kinetics

后交叉韧带胫骨附着点撕脱骨折:关节镜治疗中的材料、植入物及内固定技术

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中国组织工程研究 2025年第4期29卷 872-880页

作者：余铭王文贵州医科大学贵州省贵阳市550004 暨南大学附属广州市红十字会医院广东省广州市510220

背景:治疗后交叉韧带胫骨附着点撕脱骨折的最佳手术技术仍值得商榷。随着关节镜手术的应用与成熟,它在后交叉韧带胫骨附着点撕脱骨折的诊疗中有很大前景。目的:综述关节镜技术在后交叉韧带胫骨附着点撕脱骨折治疗中的应用与进展,包括不... 详细信息

背景:治疗后交叉韧带胫骨附着点撕脱骨折的最佳手术技术仍值得商榷。随着关节镜手术的应用与成熟,它在后交叉韧带胫骨附着点撕脱骨折的诊疗中有很大前景。目的:综述关节镜技术在后交叉韧带胫骨附着点撕脱骨折治疗中的应用与进展,包括不同关节镜治疗方法、手术入路、胫骨隧道设计、缝合材料选择以及内固定植入物选择等。方法:通过计算机对中国知网、PubMed、Web of Science及ScienceDirect等数据库中的相关文献进行检索,检索时间为2003年1月至2023年11月,中文检索词为“后交叉韧带,后十字韧带,撕脱骨折,关节镜”;英文检索词为“posterior cruciate ligament,avulsion,fracture,tibia,arthroscopic,operation,fixation,treatment”。共纳入97篇文献进行综述。结果与结论:关节镜技术提供了一种可靠的治疗方式来治疗后交叉韧带胫骨附着点撕脱骨折。根据入路、缝合材料类型以及用于缝合的入路和胫骨隧道数量等不同,关节镜技术可以分为关节镜下缝线固定结合自体移植物增强重建、关节镜下多交叉带缝合桥固定、关节镜下高强度缝线固定以及关节镜下直接前后缝合悬吊固定等几类。在各种研究中,常用的临床结果评估指标包括关节活动度、Lysholm评分、国际膝关节文献委员会评分及KT-2000关节测量仪差等,研究显示关节镜手术后末次随访时上述指标检测结果较术前显著改善,影像学随访结果显示关节镜手术都取得了令人满意的结果。在随访过程中,接受关节镜技术治疗后的各类交叉韧带胫骨附着点撕脱骨折患者都未出现严重并发症,例如创伤性关节炎、神经血管损伤、围手术期伤口感染、血栓形成以及骨折不愈合等。

关键词：后交叉韧带胫骨撕脱骨折关节镜手术缝合材料内固定治疗

Molecular mechanism and research progress of traditional Chinese medicine in the treatment of prostate cancer

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Traditional Medicine Research 2025年第1期10卷 62-72页

作者： Hai-Luo wang Ruo-Ran Zhang Hao wang Peng Xu Jing-Kai wang Bo Chen Hao Xu Deng Pan yu-Yang Ma Kun Pang Department of Urology Xuzhou Central HospitalXuzhou Clinical School of Xuzhou Medical CollegeXuzhou 221009China Graduate School Jiangsu UniversityZhenjiang 212013China Graduate School Bengbu Medical UniversityBengbu 233040China Department of Urology The Peixian People’s HospitalXuzhou 221699China.

Prostate cancer(PCa)is one of the most common malignant tumors in the male genitourinary system,ranking second in incidence *** Chinese medicine(TCM),as an important component of complementary and alternative medicine,shows unique advantages in cancer *** herbal medicine is usually composed of multiple ingredients and involves multiple signaling pathways,which showed function of inducing apoptosis of cancer cells,arresting the cell cycle,inhibiting invasion and metastasis,reducing drug resistance,and regulating immune *** therapy is also an important treatment of ***,Physical therapy such as acupuncture or Tai Chi and Qigong are gaining increased recognition in the management of PCa,particularly in addressing issues like urinary incontinence and bone metastasis-related *** article reviews the TCM treatment and therapy of PCa,in order to provide new research avenues and treatment options for the treatment of PCa with TCM and improve the quality of life of patients.

关键词： traditional Chinese medicine prostate cancer Chinese herbal medicine physical therapy

N-Heterocyclic carbene-stabilized platinum nanoparticles within a porphyrinic nanocage for selective photooxidation

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Science China Chemistry 2023年第3期66卷 778-782页

作者： Yi-Shou wang Hao Li sha Bai Yao-yu wang Ying-Feng Han Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education Xi’an Key Laboratory of Functional Supramolecular Structure and MaterialsCollege of Chemistry and Materials ScienceNorthwest UniversityXi’an 710127China

The successful construction of highly stable and active platinum nanoparticles(Pt NPs) within the confined cavity of a threedimensional porphyrinic nanocage is presented in this study. The flexible porphyrinic nanocage containing eight N-heterocyclic carbene(NHC) precursors was prepared using a metal-carbene-templated ring-closing metathesis(RCM) approach as new capping materials for the fabrication/stabilization of Pt NPs. Notably, the NHC-stabilized Pt NPs within the porphyrinic nanocage exhibited high catalytic activity for selective oxidation of 2-chloroethyl ethyl sulfide to nontoxic 2-chloroethyl ethyl sulfoxide with excellent stability and recyclability.

关键词： polycarbenes porphyrinic cage nanoparticles photocatalysis

Hybrid coordinated strategy of downlink coordinated multi-point transmission

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Journal of Systems Engineering and Electronics 2015年第5期26卷 916-923页

作者： Zhuoming Li yuqi Liu yu Zhang Peng wang Chunyang Tian Xuejun sha School of Electronics and Information Engineering Harbin Institute of Technology School of Computer Science and Technology Harbin Institute of Technology

Coordinated multi-point(CoMP) transmission is put forward in the long term evolution-advanced(LTE-A) system to improve both average and cell-edge throughput. CoMP-joint processing(JP) scheme can get a larger cell-edge throughput and a lower bit error rate(BER) than the CoMP-coordinated beamforming(CB) scheme, but it also has higher complexity due to data sharing. A hybrid coordinated strategy with parameter α, which indicates the proportion of users employing the CoMP-JP scheme,is proposed to apply the CoMP-JP scheme to improve the poorer communication quality of cell edge and employ the CoMP-CB scheme for other users to enhance average throughput and spectral efficiency. This paradigm selects users defined by the certain threshold of signal to interference plus noise power ratio(SINR)corresponding to the parameter α to the CoMP-JP scheme. This paper compares the BER performance between the block diagonalization(BD) based precoding and the linear precoders by maximizing signal to leakage and noise ratio(SLNR), and also indicates that the SLNR based precoding algorithm gets lower BER than the BD based precoding algorithm with certain signal-to-noise ratios(SNRs). Finally, this paper discusses that the system performance is partially affected by the percentage of CoMP-JP users and concludes that 50% of users sorted to communicate under the CoMP-JP scheme will reach the best system performance.

关键词： coordinated multi-point(CoMP) block diagonalization(BD) signal to leakage and noise ratio(SLNR) hybrid coordinated strategy