检索结果-南通市图书馆

Copper(Ⅰ) complexes with planar chirality realize efficient circularly polarized electroluminescence

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第8期66卷 2274-2282页

作者： Ao ying Lisi zhan Yao Tan xiaosong Cao Chuluo Yang Shaolong Gong Department of Chemistry Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsWuhan UniversityWuhan430072China Shenzhen Key Laboratory of New Display and Storage Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen518060China

Chiral organometallic emitters hold great promise in potential and practical applications of circularly polarized organic lightemitting diodes(CP-OLEDs).However,developing luminescent earth-abundant organometallic complexes concurrently exhibiting circularly polarized luminescence(CPL)and high quantum efficiency remains a formidable *** this study,we introduced a typical planar chiral skeleton of a[2.2]paracyclophane moiety into earth-abundant copper(I)complexes with the goal of realizing efficient CPL and thermally activated delayed fluorescence(TADF)*** pairs of proof-of-theconcept copper(I)enantiomers,R_(p)/S_(p)-MAC^(*)-Cu-CzP and R_(p)/S_(p)-MAC^(*)-Cu-CNCzP,were developed using planar chiral[2.2]paracyclophane-based donor ligands in a carbene-metal-amide(CMA)*** panels of enantiomers not only exhibited significant mirror-image CPL signals but also displayed distinct TADF nature with fast reverse intersystem crossing rates of up to 10^(8)s^(-1).The resultant OLEDs based on the MAC^(*)-Cu-Cz P enantiomers manifested efficient circularly polarized electroluminescence with excellent external quantum efficiencies of 13.2%and ultraslow efficiency roll-off(7.7%at 10,000 nits).This article not only demonstrates one of the best performances for CP-OLEDs based on earth-abundant organometallic complexes but also represents the first example of CP-OLEDs from CMA complexes to our knowledge.

关键词： circularly polarized luminescence(CPL) organic light-emitting diode(OLED) copper(Ⅰ)complex carbene-metal-amide(CMA) thermally activated delayed fluorescence(TADF)

同方期刊数据库

Energy dependence on modes of electric activities of neuron driven by different external mixed signals under electromagnetic induction

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2019年第3期62卷 427-440页

作者： LU LuLu JIA Ya XU ying GE MengYan YANG LiJian zhan Xuan Institute of Biophysics and Department of Physics Central China Normal University

Energy supply and release play an important role in individual neuron and neural network. In this paper, the electrical activities and Hamilton energy of neuron are investigated when external mixed signals(i.e., the periodic stimulus current and the periodic electromagnetic field) are imposed on the neuron under the electromagnetic induction. As a result, the Hamilton energy is much dependent on the mode transition, the multiple electric activity modes and the numerical analysis of Hamilton energy are more complicated under various parameters. When the periodic high-low frequency electromagnetic radiation is imposed in neuron, it is found that the electrical activities are more complex, and the changing of energy is obvious. In addition, the response of electrical activity and Hamilton energy is much dependent on the changing of amplitude A, B when the external high-low frequency signal is imposed on the neuron, meanwhile, the energy of bursting state is lower than the one of spiking state. It can be used for investigation about the energy coding in the neuron even the neuron networks.

关键词： Hamilton energy electromagnetic induction electric activity multiple growing modes

From ancient wisdom to modern science:Gut microbiota sheds light on property theory of traditional Chinese medicine

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Medicine 2024年第4期22卷 413-444页

作者： Ya-nan Yang Jia-guo zhan ying Cao Chong-ming Wu School of Chinese Materia Medica Tianjin University of Traditional Chinese MedicineTianjin 301617China Tianjin Key Laboratory of Therapeutic Substance of Traditional Chinese Medicine Tianjin 301617China

The property theory of traditional Chinese medicine(TCM) has been practiced for thousands of years,playing a pivotal role in the clinical application of TCM. While advancements in energy metabolism,chemical composition analysis, machine learning, ion current modeling, and supercritical fluid technology have provided valuable insight into how aspects of TCM property theory may be measured, these studies only capture specific aspects of TCM property theory in isolation, overlooking the holistic perspective inherent in TCM. To systematically investigate the modern interpretation of the TCM property theory from multidimensional perspectives, we consulted the Chinese Pharmacopoeia(2020 edition) to compile a list of Chinese materia medica(CMM). Then, using the Latin names of each CMM and gut microbiota as keywords, we searched the PubMed database for relevant research on gut microbiota and CMM. The regulatory patterns of different herbs on gut microbiota were then summarized from the perspectives of the four natures, the five flavors and the meridian tropism. In terms of the four natures, we found that warm-natured medicines promoted the colonization of specific beneficial bacteria,while cold-natured medicines boosted populations of some beneficial bacteria while suppressing pathogenic bacteria. Analysis of the five flavors revealed that sweet-flavored and bitter-flavored CMMs positively influenced beneficial bacteria while inhibiting harmful bacteria. CMMs with different meridian tropism exhibited complex modulative patterns on gut microbiota, with Jueyin(Liver) and Taiyin(Lung) meridian CMMs generally exerting a stronger effect. The gut microbiota may be a biological indicator for characterizing the TCM property theory, which not only enhances our understanding of classic TCM theory but also contributes to its scientific advancement and application in healthcare.

关键词： Traditional Chinese medicine Property theory Gut microbiota Four natures Five flavors Meridian tropism

Unified simulation of hardening and softening effects for metals up to failure

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2021年第12期42卷 1685-1702页

作者： Siyu WANG Lin zhan Huifeng XI O.T.BRUHNS Heng xiao School of Mechanics and Construction Engineering MOE Key Lab of Disaster Forecast and Control in EngineeringJinan UniversityGuangzhou 510632China Institute of Mechanics Ruhr-University BochumBochum D-44780Germany

Toward accurately simulating both hardening and softening effects for metals up to failure,a new finite strain elastoplastic J2-flow model is proposed with the yield strength therein as a function of the plastic work in the explicit *** no need to identify any adjustable parameters,the uniaxial stress-strain response predicted from this new model is shown to automatically and accurately match any given data from monotonic uniaxial extension tests of *** such,the objectives in three respects are achieved for the first time,i.e.,(i)both the hardening and softening effects up to failure can be simulated in the sense of matching test data with no errors,(ii)the usual tedious implicit procedures toward identifying numerous unknown parameters need not be involved and can be totally bypassed,and(iii)the model applicability can be ensured in a broad sense for various metallic materials with markedly different transition effects from hardening to *** the new model,the complete response features of stretched bars and twisted tubes up to failure are studied,including the failure effects of bars under monotonic extension and tubes under monotonic torsion and,furthermore,the fatigue failure effects of bars under cyclic *** results show accurate agreement with the uniaxial data,and the results for both the shear stress and the normal stress at the finite torsion display realistic hardening-to-softening transition effects for the first time.

关键词： metal hardening softening failure necking yield strength accurate approach

Two-Quark Condensate Changes with Quark Current Mass

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第9期52卷 483-486页

作者： LU Chang-Fang LU xiao-Fu WU xiao-Hua zhan Yong-Xin Department of Physics Sichuan University Chengdu 610064 China Department of Physics Sichuan Agricultural University Ya＇an 625014 China Institute of Theoretical Physics The Chinese Academy of Sciences Beijing 100080 China CCAST （World Laboratory） P.O. Box 8730 Beijing 100080 China

Using the Schwinger Dyson equation and perturbation theory,we calculate the two-quark condensates forthe light quarks u,d,strange quark s and a heavy quark c with their current masses *** results show thatthe two-quark condensate will decrease when the quark mass increases,which hints the chiral symmetry may be restoredfor the heavy quarks.

关键词： quark current mass quark condensates QCD sum rule Schwinger-Dyson equation perturbation theory

Propagation of Few-Cycle Pulse Laser in Two-Level Atom Medium

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第7期18卷 912-914页

作者： xiao Jian WANG Zhong-Yang XU Zhi-zhan Laboratory for High Intensity Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800

By comparing the numerical solutions of Maxwell-Bloch equations beyond and within the slowly-varying envelope approximation and the rotating-wave approximation for the propagation of few-cycle pulse laser in a resonant two-level atom medium,we found that both the Rabi flopping and the refractive index,and subsequently the carrier and the propagation velocity of the few-cycle pulse,are closely connected with the time-derivative behaviour of the electric *** is because of the Rabi flopping is such that soliton pulse splits during propagation and that a shorter pulse propagates faster than a broader one.

关键词： approximation soliton faster

Listeria monocytogenes bacteremia in a centenarian and pathogen traceability:A case report

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

World Journal of Clinical Cases 2021年第18期9卷 4873-4880页

作者： Zhong-ying zhang xiao-Ai zhang Qian Chen Jie-Yu Wang Yun Li zhan-Yun Wei Zi-Chen Wang Department of Geriatric Medicine Xuanwu HospitalCapital Medical UniversityBeijing 100053China Beijing Center for Disease Prevention and Control Institute for Nutrition and Food HygieneBeijing 100053China Research Centre for Preventive Medicine of Beijing Beijing 100053China

BACKGROUND Early diagnosis and appropriate antibiotic treatment are important to survival of Listeria monocytogenes(***)*** tends to be the most commonly used ***,there are limited data on antibiotic use in elderly patients with serious *** describe the clinical presentation,antibiotic therapy,and traceability of *** in a centenarian with a history of eating frozen *** SUMMARY A 102-year-old man suffered from high fever with chill after *** diagnoses were lower gastrointestinal hemorrhage and localized *** and ornidazole were the empirical *** patient did not respond and developed multiple system dysfunction even after teicoplanin was added to the *** was identified from blood cultures on day 5 of *** patient had a history of consuming frozen ***/ornidazole/teicoplanin were replaced with meropenem/*** patient gradually became *** received meropenem/linezolid for 10 d,and piperacillin/tazobactam was applied as step-down treatment for 2 wk with good clinical *** was no sign of relapse during follow-up after *** isolates from the patient and frozen dumplings belonged to different serotypes and sequence types(STs):1/2b and ST5 from the patient and 1/2c and ST9 from the *** More awareness of listeriosis should be *** might be an option for listeriosis in elderly people with serious complications.

关键词： Listeria monocytogenes Centenarian Bacteremia Traceability Antibiotics Case report

Solitons in nonlinear systems and eigen-states in quantum wells

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

Chinese Physics B 2019年第1期28卷 257-266页

作者： Li-Chen Zhao zhan-ying Yang Wen-Li Yang School of Physics Northwest UniversityXi’an 710069China Shaanxi Key Laboratory for Theoretical Physics Frontiers Xi’an 710069China Institute of Modern Physics Northwest UniversityXi’an 710069China

We study the relations between solitons of nonlinear Schro¨dinger equation and eigen-states of linear Schro¨dinger equation with some quantum wells. Many different non-degenerated solitons are re-derived from the eigen-states in the quantum wells. We show that the vector solitons for the coupled system with attractive interactions correspond to the identical eigen-states with the ones of the coupled systems with repulsive interactions. Although their energy eigenvalues seem to be different, they can be reduced to identical ones in the same quantum wells. The non-degenerated solitons for multi-component systems can be used to construct much abundant degenerated solitons in more components coupled ***, we demonstrate that soliton solutions in nonlinear systems can also be used to solve the eigen-problems of quantum wells. As an example, we present the eigenvalue and eigen-state in a complicated quantum well for which the Hamiltonian belongs to the non-Hermitian Hamiltonian having parity–time symmetry. We further present the ground state and the first exited state in an asymmetric quantum double-well from asymmetric solitons. Based on these results, we expect that many nonlinear physical systems can be used to observe the quantum states evolution of quantum wells, such as a water wave tank, nonlinear fiber, Bose–Einstein condensate, and even plasma, although some of them are classical physical systems. These relations provide another way to understand the stability of solitons in nonlinear Schro¨dinger equation described systems, in contrast to the balance between dispersion and nonlinearity.

关键词： non-degenerated soliton eigen-states quantum well nonlinear Schrodinger equation

Many-Agent Controlled Teleportation of Multi-qubit Quantum Information via Quantum Entanglement Swapping

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第5X期44卷 847-850页

作者： zhanG zhan-Jun LIU Yi-Min MAN Zhong-xiao School of Physics & Material Science Anhui University Hefei 230039 China Department of Physics Shaoguan University Shaoguan 512005 China Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China

We present a method to teleport multi-qubit quantum information in an easy way from a sender to a receiver via the control of many agents in a network. Only when all the agents collaborate with the quantum information receiver can the unknown states in the sender＇s qubits be fully reconstructed in the receiver＇s qubits. In our method, agents＇s control parameters are obtained via quantum entanglement swapping. As the realization of the many-agent controlled teleportation is concerned, compared to the recent method [G.P. Yang, et al., Phys. Rev. A 70 （2004） 022329], our present method considerably reduces the preparation difficulty of initial states and the identification difficulty of entangled states, moreover, it does not need local Hadamard operations and it is more feasible in technology.

关键词： quantum teleportation quantum information quantum entanglement swapping