检索结果-南通市图书馆

同方期刊数据库

Some notes on a conjecture of Zygmund

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2008年第2期23卷 213-218页

作者： CHEN jie-cheng zhang Chun-jie Dept. of Math. Zhejiang Univ. Hangzhou 310027 China

In this paper, some classes of differentiation basis are investigated and several positive answers to a conjecture of Zygmund on differentiation of integrals are presented.

关键词： Zygmund's conjecture differentiation of integrals maximal function.

Quantum deleting and cloning in a pseudo-unitary system

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2021年第5期16卷 61-67页

作者： Yu-cheng Chen Ming Gong Peng Xue Hai-Dong Yuan cheng-jie zhang School of Physical Science and Technology Ningbo UniversityNingbo315211China Key Laboratory of Quantum Information University of Science and Technology of ChinaCASHefei230026China Beijing Computational Science Research Center Beijing100084China Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongChina School of Physical Science and Technology Soochow UniversitySuzhou215006China

In conventional quantum mechanics,quantum no-deleting and no-cloning theorems indicate that two different and nonorthogonal states cannot be perfectly and deterministically deleted and cloned,***,we investigate the quantum deleting and cloning in a pseudo-unitary *** first present a pseudo-Hermitian Hamiltonian with real eigenvalues in a two-qubit *** using the pseudo-unitary operators generated from this pseudo-Hermitian Hamiltonian,we show that it is possible to delete and clone a class of two different and nonorthogonal states,and it can be generalized to arbitrary two different and nonorthogonal pure qubit ***,state discrimination,which is strongly related to quantum no-cloning theorem,is also *** but not least,we simulate the pseudo-unitary operators in conventional quantum mechanics with post-selection,and obtain the success probability of ***-unitary operators are implemented with a limited efficiency due to the ***,the success probabilities of deleting and cloning in the simulation by conventional quantum mechanics are less than unity,which maintain the quantum no-deleting and no-cloning theorems.

关键词： quantum deleting quantum cloning pseudo-unitary

Generalized Hardy-type tests for hierarchy of multipartite non-locality

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第12期28卷 99-104页

作者： Fei Yang Yu Yuan Wen-Lu Lin Shu-Ao Liao cheng-jie zhang Qing Chen School of Physics and Astronomy Yunnan UniversityKunming 650500China Key Laboratory of Quantum Information of Yunnan Province Kunming 650500China College of Physics Optoelectronics and EnergySoochow UniversitySuzhou 215006China

We propose a family of Hardy-type tests for an arbitrary n-partite system, which can detect different degrees of nonlocality ranging from standard to genuine multipartite non-locality. For any non-signaling m-local hidden variable model,the corresponding tests fail, whereas a pass of this type of test indicates that this state is m non-local. We show that any entangled generalized GHZ state exhibits Hardy’s non-locality for each rank of multipartite non-locality. Furthermore, for the detection of m non-localities, a family of Bell-type inequalities based on our test is constructed. Numerical results show that it is more efficient than the inequalities proposed in [Phys. Rev. A 94 022110(2016)].

关键词： Hardy paradox Bell non-locality multipartite non-locality

Control of Corner Separation for a Linear Compressor Cascade via Bionic Slanting Riblets at the Endwall

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2025年第1期34卷 129-144页

作者： zhang Peng LI Yonghong cheng Rixin Key Laboratory of Civil Aircraft Airworthiness Technology Civil Aviation University of China College of Aeronautical Engineering Civil Aviation University of China

A new passive control approach,utilizing bionic slanting riblets,is employed to mitigate the flow close to the blade endwall in a linear cascade,and its effectiveness and mechanism in controlling corner separation are investigated through numerical *** slanting riblets are positioned at the endwall upstream of the cascade channel,and the influence of riblet height,yaw angle and relative position on the control of corner separation is *** findings indicate that the application of slanting riblets can efficiently counteract corner separation across the stable operational ***,the introduction of riblets with a height of merely 0.1 times the boundary layer thickness results in a significant reduction in total pressure loss by up to 14.53%,while simultaneously enhancing the static pressure coefficient by 21.74%.Flow analysis reveals that minute vortices produced within the riblet channels tend to coalesce,forming a potent large-scale vortex near the boundary layer's base *** phenomenon results in reduced additional losses compared to conventional vortex ***,the induced vortex promotes enhanced mixing between the mainstream flow and boundary layer,inhibiting the lateral displacement of low-energy fluids within the endwall boundary ***,this delays the onset of separation vortex formation and eliminates vortex rings in the corner region,ultimately enhancing the aerodynamic efficiency of the cascade.

关键词： additional losses compressor cascade corner separation slanting riblets vortex generator

Dynamic behaviors of graphene platelets-reinforced metal foam piezoelectric beams with velocity feedback control

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 63-80页

作者： jie CHEN Xinyue zhang Mingyang FAN School of Mathematics Statistics and Mechanics Beijing University of Technology College of Mechanical & Energy Engineering Beijing University of Technology

Graphene platelets(GPLs)-reinforced metal foam structures enhance the mechanical properties while maintaining the lightweight characteristics of metal foams. Further bonding piezoelectric actuator and sensor layers on the surfaces of GPLs-reinforced metal foam beams enables active vibration control, greatly expanding their applications in the aerospace industry. For the first time, this paper investigates the vibration characteristics and active vibration control of GPLs-reinforced metal foam beams with surfacebonded piezoelectric layers. The constant velocity feedback scheme is used to design the closed-loop controller including piezoelectric actuators and sensors. The effects of the GPLs on the linear and nonlinear free vibrations of the beams are numerically *** Newmark-β method combined with Newton's iteration technique is used to calculate the nonlinear responses of the beams under different load forms including harmonic loads,impact loads, and moving loads. Additionally, special attention is given to the vibration reduction performance of the velocity feedback control on the responses of the beam.

关键词： Piezoelectric actuators

Experimental verification of a coherence factorization law for quantum states

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2022年第9期10卷 2172-2177页

作者： YI ZHENG cheng-jie zhang ZHENG-HAO LIU JIAN-WEI SHAO JIN-SHI XU CHUAN-FENG LI GUANG-CAN GUO CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China School of Physical Science and Technology Ningbo UniversityNingbo 315211China State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China

As a quantum resource,quantum coherence plays an important role in modern *** coherence measures and their relations with entanglement have been proposed,and the dynamics of entanglement has been experimentally ***,the knowledge of general results for coherence dynamics in open systems is *** we propose a coherence factorization law that describes the evolution of coherence passing through any noisy channels characterized by genuinely incoherent *** use photons to implement the quantum operations and experimentally verify the law for qubits and *** work is a step toward understanding of the evolution of coherence when the system interacts with the environment,and will boost the study of more general laws of coherence.

关键词： quantum factorization operations

Ideal Bi‑Based Hybrid Anode Material for Ultrafast Charging of Sodium‑Ion Batteries at Extremely Low Temperatures

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第3期17卷 152-167页

作者： jie Bai Jian Hui Jia Yu Wang Chun cheng Yang Qing Jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130022People’s Republic of China

Sodium-ion batteries have emerged as competitive substitutes for low-temperature applications due to severe capacity loss and safety concerns of lithium-ion batteries at−20°C or ***,the key capability of ultrafast charging at ultralow temperature for SIBs is rarely ***,a hybrid of Bi nanoparticles embedded in carbon nanorods is demonstrated as an ideal material to address this issue,which is synthesized via a high temperature shock *** a hybrid shows an unprecedented rate performance(237.9 mAh g^(−1)at 2 A g^(−1))at−60℃,outperforming all reported SIB anode *** with a Na_(3)V_(2)(PO_(4))_(3)cathode,the energy density of the full cell can reach to 181.9 Wh kg^(−1)at−40°*** on this work,a novel strategy of high-rate activation is proposed to enhance performances of Bi-based materials in cryogenic conditions by creating new active sites for interfacial reaction under large current.

关键词： Bi nanoparticles High temperature shock High-rate activation Ultrafast charging Low-temperature sodium-ion batteries

Expression of vascular endothelial growth fac-tor gene in primary cultured rat hepatocytes

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2004年第3期3卷 444-447页

作者： Jin-Lin Wang, Jun Ming, Xiao-Dong Zhou, Ya-Jin cheng, Lei zhang and jie-Shen cheng Department of Hepatobiliary Surgery, Sun Yat-SenMemorial Hospital, Sun Yat-Sen University, Guangzhou 510120, China Department of Hepatobiliary Surgery Sun Yat-Sen Memorial Hospital Sun Yat-Sen University Guangzhou 510120 China. wangjinlin@***

BACKGROUND: It is the key point for vascular endothelialgrowth factor (VEGF121) gene related therapy as to how totransfect and express the gene safely, effectively and repeat-edly. This study was designed to investigate the VEGF121transfection and expression in primary cultured rat ***: After construction of vector internal ribosomeentry site-enhanced yellow fluorescent protein (pIRES-EY-FP)/VEGF121, the transfection and expression of the exoge-nous VEGF121 gene in primary cultured rat hepatocyteswere observed through RT-PCR, Western blot and fluores-cent ***: pIRES-EYFP/VEGF121 plasmid was construct-ed and transfected successfully into primary cultured rathepatocytes, the transfection and expression of gene in pri-mary cultured rat hepatocytes were examined by RT-PCRand Western blot, and yellow-green fluorescence was ob-served through a fluorescent ***: The successful transfection and expressionof plasmid pIRES-EYFP/VEGF121 in primary cultured rathepatocytes provides a foundation for hepatocyte transplan-tation and gene therapy after modification of hepatocytesby the gene.

关键词： vascular endothelial growth factor cell, cultured yellow fluorescent protein gene therapy transfection hepatocyte transplantation

A Cross-Multi-Domain Trust Assessment Authority Delegation Method Based on Automotive Industry Chain

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 407-426页

作者： Binyong Li Liangming Deng jie zhang Xianhui Deng School of Cybersecurity(Xin Gu Industrial College) Chengdu University of Information TechnologyChengdu610225China Advanced Cryptography and System Security Key Laboratory of Sichuan Province Chengdu610225China SUGON Industrial Control and Security Center Chengdu610225China

To solve the challenges of connecting and coordinating multiple platforms in the automotive industry and to enhance collaboration among different participants,this research focuses on addressing the complex supply relationships in the automotive market,improving data sharing and interactions across various platforms,and achieving more detailed integration of data and *** propose a trust evaluation permission delegation method based on the automotive industry *** proposed method combines smart contracts with trust evaluation mechanisms,dynamically calculating the trust value of users based on the historical behavior of the delegated entity,network environment,and other factors to avoid malicious node attacks during the permission delegation *** also introduce strict control over the cross-domain permission granting and revocation mechanisms to manage the delegation path,prevent information leakage caused by malicious node interception,and effectively protect data integrity and *** analysis shows that this method meets the realtime requirements of collaborative interaction in the automotive industry chain and provides a feasible solution to permission delegation issues in the automotive industry chain,offering dynamic flexibility in authorization and scalability compared to most existing solutions.

关键词： Automotive industry chain cross-domain access block chain delegate authority trust assessment