检索结果-南通市图书馆

Quantification of polarization distribution from polarizing light microscopy images of ferroelectric single crystals

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第30期161卷 1-9页

作者： Jinhui Fan Xiaoyan lu Wenwu cao Functional Materials and Acousto-optic Instruments Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080China School of Civil Engineering Harbin Institute of TechnologyHarbin 150001China Materials Research Institute The Pennsylvania State UniversityUniversity ParkPennsylvania 16802USA

Qualification of polarization can be realized either on a macroscopic scale as an average property by P-E hysteresis measurements or on a nano/micro scale by piezoelectric force microscopy,transmission electron microscopy,scanning electron microscopy,and so ***,visualization and qualification of polarization distribution in the micron to millimeter scale is still a *** light microscopy(PLM)is often used in the study of ferroelectric domain structures mainly for domain patterns.A phe-nomenon called“chromatic polarization”has been observed in transparent ferroelectric crystals by using a crossed-PLM system viewed with white light,which contains rich information about local polariza-tion *** this study,an automatic full-angle light intensity detection(AFALID)algorithm com-bined with colorimetry is developed to analyze the distribution of nonuniform local spontaneous polar-ization distribution in transparent ferroelectric single ***-dependent spontaneous po-larizations from the color analysis for PMN-0.36PT single crystals with single tetragonal domain state are in good coincidence with those extracted from temperature-dependent hysteresis loops and pyroelectric current *** further apply this method to quantify the nonuniform domain distributions with *** non-contact and non-destructive characterization can provide fast and au-tomatic detection of polarization distributions in ferroelectric materials.

关键词： Polarizing light microscopy Polarization distribution Ferroelectric single crystals Chromatic polarization

Distributed Adaptive Output Consensus of Unknown Heterogeneous Non-Minimum Phase Multi-Agent Systems

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

IEEE/CAA Journal of Automatica Sinica 2023年第4期10卷 997-1008页

作者： Wenji cao lu Liu Gang Feng Department of Biomedical Engineering City University of Hong KongHong Kong SARChina

This article addresses the leader-following output consensus problem of heterogeneous linear multi-agent systems with unknown agent parameters under directed *** dynamics of followers are allowed to be non-minimum phase with unknown arbitrary individual relative *** is contrary to many existing works on distributed adaptive control schemes where agent dynamics are required to be minimum phase and often of the same relative degree.A distributed adaptive pole placement control scheme is developed,which consists of a distributed observer and an adaptive pole placement control *** is shown that under the proposed distributed adaptive control scheme,all signals in the closed-loop system are bounded and the outputs of all the followers track the output of the leader *** effectiveness of the proposed scheme is demonstrated by one practical example and one numerical example.

关键词： Adaptive pole placement control heterogeneous multi-agent systems leader-following output consensus non-minimum phase

Robust optimization of control command for aerospace vehicles with aerodynamic uncertainty

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2022年第12期35卷 226-241页

作者： Rui cao Yanbin LIU Yuping lu College of Automated Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

To reduce the design burden of Aerospace Vehicles(ASVs)control systems,this paper proposes a multi-constrained robust trajectory optimization method,which provides a good front-end input for the control *** from the conventional aircraft,some control performance of ASVs is not only related to the model parameters,but also affected by the flight ***,the robust optimization method combines this characteristic of ASVs,sets the control performance as one of the optimization objectives,and considers the influence of parameter *** this method,the polynomial chaos expansion algorithm is used to transform the trajectory optimization problem with uncertain parameters into the equivalent deterministic robust trajectory optimization ***,compared with traditional deterministic trajectory optimization methods to illustrate the effectiveness of proposed control optimization method.

关键词： Aerospace vehicle Multi-objective optimization Polynomial chaos Uncertain systems

Serine 707 of APPL1 is Critical for the Synaptic NMDA Receptor-Mediated Akt Phosphorylation Signaling Pathway

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2016年第4期32卷 323-330页

作者： Jiejie Wang Wen lu Lin Chen ping Zhang Tingting Qian Wei cao Jianhong luo Department of Neurobiology Zhejiang University School of Medicine The Second Affiliated Hospital Zhejiang University School of Medicine Sir Run Run Shaw Hospital Zhejiang University School of Medicine

Accumulating evidence indicates that the synaptic activation of N-methyl-o-aspartate receptors （NMDARs） has a neuroprotective effect on neurons. Our previous study demonstrated that APPL1 （adaptor protein containing pleckstrin homology domain, phosphotyrosine- binding domain, and leucine zipper motif） mediates the synaptic activity-dependent activation of PI3K-Akt signaling via coupling this pathway with NMDAR-PSD95 （postsynaptic density protein 95） complexes. However, the molecular mechanism underlying this process is still unknown. In the present study, we investigated the inter- action of APPL1 with PSD95 using co-immunocyto- chemical staining and western blotting. We found that the PDZ2 domain of PSD95 is a binding partner of APPL1. Furthermore, we identified serine 707 of APPL1, a pre- dicted phosphorylation site within the PDZ-binding motif at the C-terminus, as critical for the binding of APPL1 to PSD95, as well as for activation of the Akt signaling pathway during synaptic activity. This suggests that serine 707 of APPL1 is a potential phosphorylation site and may be involved in regulating the neuroprotective Akt signaling pathway that depends on synaptic NMDAR activity.

关键词： APPL1 PSD95 Akt NMDA receptors Neuroprotection

Day-ahead scheduling based on reinforcement learning with hybrid action space

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2022年第3期33卷 693-705页

作者： cao Jingyu DONG lu SUN Changyin School of Automation Southeast UniversityNanjing 210096China School of Cyber Science and Engineering Southeast UniversityNanjing 211189China

Driven by the improvement of the smart grid,the active distribution network(ADN)has attracted much attention due to its characteristic of active *** making full use of electricity price signals for optimal scheduling,the total cost of the ADN can be ***,the optimal dayahead scheduling problem is challenging since the future electricity price is ***,in ADN,some schedulable variables are continuous while some schedulable variables are discrete,which increases the difficulty of determining the optimal scheduling *** this paper,the day-ahead scheduling problem of the ADN is formulated as a Markov decision process(MDP)with continuous-discrete hybrid action ***,an algorithm based on multi-agent hybrid reinforcement learning(HRL)is proposed to obtain the optimal scheduling *** proposed algorithm adopts the structure of centralized training and decentralized execution,and different methods are applied to determine the selection policy of continuous scheduling variables and discrete scheduling *** simulation experiment results demonstrate the effectiveness of the algorithm.

关键词： day-ahead scheduling active distribution network(ADN) reinforcement learning hybrid action space

First-principles insight into the entanglements between superionic diffusion and Li/Al antisite in Al-doped Li1+xAlxGe2–x(PO4)3(LAGP)

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2020年第9期63卷 1787-1794页

作者： JIANG ChangKun lu Xia cao DaPeng State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China School of Materials Sun Yat-sen UniversityGuangzhou510006China

As an ion conductor, the Al-doped Li1+xAlxGe2-x(PO4)3(LAGP) demonstrates the superionic Li diffusion behavior, however,without the convinced verifications. In this context, the density functional theory(DFT) calculations are employed to clarify the structural origin of the fast Li ion migration kinetics in LAGP solid electrolytes. The calculated results show that doping of Al leads to an emerging high-energy 36 f Li site, which plays an important role in promoting the Li diffusion and can largely lower the Li ion diffusion energy barrier. Moreover, the Li/Al antisite defect is investigated firstly, with which the Li ions are excited to occupy a relatively high energy site in LAGP. The obvious local structural distortion by Li/Al antisite results in the coordination change upon Li diffusion(lattice field distortion), which facilitates the Li diffusion significantly and is probably the main reason to account for the superionic diffusion phenomenon. Therefore, the occupation of Li at high-energy sites should be an effective method to establish the fast Li diffusion, which implies a rewarding avenue to build better Li-ion batteries.

关键词： Li1+xAlxGe2–x(PO4)3(LAGP) Li/Al antisite superionic conductor first-principles calculations Li ion batteries

A Novel Series of Refractory High-Entropy Alloys Ti2ZrHf0.5VNbx with High Specific Yield Strength and Good Ductility

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2019年第8期32卷 925-931页

作者： Dong-Xu Qiao Hui Jiang Wen-Na Jiao Yi-ping lu Zhi-Qiang cao Ting-Ju Li Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China

A series of Ti2ZrHf0.5VNbx( x = 0, 0.25, 0.5, 0.75 and 1.0) refractory high-entropy alloys were prepared to investigate the alloying effect of Nb on the microstructures and mechanical *** the alloys displayed a simple BCC *** microstructures of the alloys changed from the initial single-phase columnar structure( x = 0) to dendrite microstructure( x > 0).At room temperature, all the alloys exhibited high ductility(with the compressive strains of more than 50%).With the increase in Nb content, the yield strength slightly decreased from 1160 to 980 MPa and the hardness dropped from 338 to 310 ***, the alloys exhibited low density from 6.47 to 6.84 g/cm3 and high specific yield strength(SYS) from 143 to 179 kPa m3/*** comprehensive performance of ductility and SYS was superior to most of the reported highentropy *** yield strength of the alloys increased from 405 to 859 MPa and from 85 to 195 MPa with the addition of Nb element at 873 K and 1073 K, respectively.

关键词： Specific yield strength Refractory metals Structure Mechanical properties

EVOluTION AND DEVELOPMENT OF GUANGZHOU-HONG KONG CORRIDOR

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2005年第3期15卷 206-211页

作者： LI ping cao Xiao-shu Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 P. R. China School of Geography and Planning Sun Yat-Sen University Guangzhou 510275 P. R. China

With its rapid development in the past two decades, the Pearl River Delta has become one of the most developed regions in China. During this period, an important corridor between Hong Kong and Guangzhou has emerged and shaped the spatial structure of the region. The growth of this region has been greatly marched with the twin poles of Guangzhou and Hong Kong, and the economic and social development has taken place in a corridor between these two metropolises. This paper provides an analysis of the significance of this corridor in terms of its infrastructure, population, land use, and economic development. Massive infrastructure construction in the corridor has played an important role in its development. The corridor has high-frequent transport, and each transport mode has contributed in a different way to the process of development of the corridor. With high land use intensity and high population density, it is developing the characteristics of a megalopolis. As a pathway of connection between Guangzhou and Hong Kong, the corridor includes not only physical infrastructure, such as roads, railways and airports, but also logistics operations, human resources, information and capital, which plays important roles in accelerating business development. It demonstrates how this Main Street has become one of the most important factors in regional development.

关键词： corridor regional development evolution

Neural Mechanisms Underlying the Coughing Reflex

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2023年第12期39卷 1823-1839页

作者： Haicheng lu Peng cao National Institute of Biological Sciences Beijing102206China School of Life Sciences Tsinghua UniversityBeijing100084China Tsinghua Institute of Multidisciplinary Biomedical Research Tsinghua UniversityBeijing102206China

Breathing is an intrinsic natural behavior and physiological process that maintains *** rhythmic exchange of gases regulates the delicate balance of chemical constituents within an organism throughout its ***,chronic airway diseases,including asthma and chronic obstructive pulmonary disease,affect millions of people *** airway conditions can disrupt respiration,causing asphyxia,cardiac arrest,and potential *** innervation of the respiratory tract and the action of the immune system confer robust airway surveillance and protection against environmental irritants and ***,aberrant activation of the immune system or sensitization of the nervous system can contribute to the development of autoimmune airway *** receptor potential ion channels and voltage-gated Na+channels play critical roles in sensing noxious stimuli within the respiratory tract and interacting with the immune system to generate neurogenic inflammation and airway *** recent studies have revealed the involvement of nociceptor neurons in airway diseases,the further neural circuitry underlying airway protection remains *** the mechanism underpinning neural circuit regulation in the airway may provide precise therapeutic strategies and valuable insights into the management of airway diseases.

关键词： Cough Neural circuit Airway disease Transient receptor potential Na+channel Treatment