检索结果-南通市图书馆

A Note for Estimation About Average Differential Entropy of Continuous Bounded Space-Time Random Field

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2022年第5期31卷 793-803页

作者： SONG Zhanjie ZHANG jiaxing Georgia Tech Shenzhen Institute Tianjin University Tianjin Key Laboratory of Brain-Inspired Intelligence Technology Tianjin University School of Mathematics Tianjin University

In this paper, we mainly study the discrete approximation about average differential entropy of continuous bounded space-time random field. The estimation of differential entropy on random variable is a classic problem, and there are many related studies. Space-time random field is a theoretical extension of adding random variables to space-time parameters, but studies on discrete estimation of entropy on space-time random field are relatively few. The differential entropy forms of continuous bounded space-time random field and discrete estimations are discussed, and three estimation forms of differential entropy in the case of random variables are generated in this paper. Furthermore, it is concluded that under the condition that the entropy estimation formula after space-time segmentation converges with probability1, the average entropy in the bounded space-time region can also converge with probability 1, and three generalized entropies are verified respectively. In addition, we also carried out numerical experiments on the convergence of average entropy estimation based on parameters,and the numerical results are consistent with the theoretical results, which indicting further study of the average entropy estimation problem of space-time random fields is significant in the future.

关键词： average differential entropy differential entropy forms average entropy estimation problem random processes entropy estimation formula random variable approximation theory space-time segmentation space-time parameters bounded space-time region entropy continuous bounded space-time random field

Polymers with complicated architectures constructed from the versatile, functional monomer 1-ethoxyethyl glycidyl ether

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2015年第11期58卷 1674-1694页

作者： jiaxing Zhang Guowei Wang State Key Laboratory of Molecular Engineering of Polymers Collaborative Innovation Center of Polymers and Polymer Composite Materials Department of Macromolecular Science Fudan University

Because glycidyl(Gly) contains an epoxy and an active hydroxyl group, the Gly unit is difficult to introduce into certain polymeric chains in a controlled manner and usually yields hyperbranched polyglycidyl. Alternatively, the monomer 1-ethoxyethyl glycidyl ether(EEGE), derived from Gly and ethyl vinyl ether, has shown potential for application in polymer chemistry, and homopolymerization of this monomer directly produces linear poly(1-ethoxyethyl glycidyl ether) and further yields linear polyglycidyl. In this review, the initiation system of the EEGE monomer is first discussed in terms of chain transfer to monomers in ring-opening polymerization of epoxides with substituent groups. Then, random copolymerization of EEGE with other epoxides is considered. In addition, because the EEGE units on polymers can be transferred to Gly units and further used to construct copolymers with complicated architectures, the applications of EEGE monomers to block, graft, and hyperbranched copolymers are reviewed. Finally, the synthesis of main chain and terminal functional polyethers by transforming the hydroxyl groups at the polymer end or on the main chain into certain functional groups are also discussed. Chemistry based on EEGE has been proved to be an efficient, versatile route to constructing copolymers containing Gly units and ultimately yielding the target properties and applications.

关键词： linear polyglycidyl (LPG) poly(1-ethoxyethyl glycidyl ether) (PEEGE) block polymer graft polymer hyper-branched polymer

Boundary Holder Estimates for a Class of Degenerate Elliptic Equations in Piecewise Smooth Domains

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2022年第5期43卷 719-738页

作者： jiaxing HONG Genggeng HUANG School of Mathematical Sciences Fudan UniversityShanghai 200433China

In this paper, the authors will apply De Giorgi-Nash-Moser iteration to establish boundary H?lder estimates for a class of degenerate elliptic equations in piecewise C^(2)-smooth domains.

关键词： Degenerate elliptic De Giorgi-Nash-Moser iteration Boundary Holder regularity

Infinitesimal nonrigidity of convex surfaces with planar boundary

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2005年第4期48卷 513-521页

作者： LI Chunhe HONG jiaxing Institute of Mathematics Fudan University Shanghai200433 China Institute of Mathematics Fudan University Shanghai200433 China

In the present paper infinitesimal nonrigidity of a class of convex surfaces with planar boundary is given. This result shows that if the image of the Gauss map of an evolution convex surface with planar boundary covers some hemisphere, this surface may be of infinitesimal nonrigidity for the isometric deformation of planar boundary.

关键词： infinitesimal nonrigidity, convex surface, planar boundary.

Performance analysis of diffusion-based decode-and-forward relay with depleted molecule shift keying

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2021年第3期7卷 399-409页

作者： jiaxing Wang Mugen Peng Yaqiong Liu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing100876China School of Electronic and Control Engineering North China Institute of Aerospace Engineering.Langfang Aerospace Testing Technology and Instrument Research and Development CenterLangfang065000China

The distance-decay effect of molecular signals makes communication range a major challenge for diffusion-based Molecular Communication(MC).To solve this problem,the intermediate nano-machine is deployed as a relay between the transmitter and its intended receiver *** this work,we employ the Depleted Molecule Shift Keying(D-MoSK)to model a Decode-and-Forward(DF)relay communication *** closed-form expression of Bit Error Rate(BER)for the concerned DF relay with D-MoSK is ***,the maximum a posteriori probability,minimum error probability,and maximum likelihood schemes are formulated for data *** relationships between BER and other key parameters,including the number of released molecules,receiving radius,and relay position,are investigated in *** results show that the proposed scheme can improve communication reliability ***,the performance gain can be maximized by optimizing the position of the relay and the receiving radius.

关键词： Diffusion Molecular communication Decode-and-Forward relay Bit error rate

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

嘉兴蚕桑文化的形成条件与特点

丝绸 2012年第3期49卷 50-54,60页

作者：刘文嘉兴学院设计学院浙江嘉兴314000

嘉兴蚕桑文化的形成有着其得天独厚的条件,湿润的气候、畅通的水系为蚕桑业提供了保障,也促进了蚕桑经济和文化的空前繁荣;古老的神话传说及祭祀蚕神的历史文化遗存,表征着蚕桑文化的悠久与丰富。嘉兴蚕桑文化最鲜明的特点是历史性、自... 详细信息

嘉兴蚕桑文化的形成有着其得天独厚的条件,湿润的气候、畅通的水系为蚕桑业提供了保障,也促进了蚕桑经济和文化的空前繁荣;古老的神话传说及祭祀蚕神的历史文化遗存,表征着蚕桑文化的悠久与丰富。嘉兴蚕桑文化最鲜明的特点是历史性、自发性、地域性、多元性和传承性。

关键词：京杭大运河蚕桑文化习俗嘉兴

Aerodynamic-Parameter Identification and Attitude Control of Quad-Rotor Model with CIFER and Adaptive LADRC

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2021年第2期34卷 150-159页

作者： Sen Yang Leiping Xi jiaxing Hao Wenjie Wang Department of UAV Engineering Army Engineering UniversityShijiazhuang 050003China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China School of Electrical and Electronic Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

Current research on quadrotor modeling mainly focuses on theoretical analysis methods and experimental methods,which have problems such as weak adaptability to the environment,high test costs,and long ***,the PID controller,which is currently widely used in quadrotors,requires improvement in ***,the aforementioned research has considerable practical significance for the modeling and controller design of quadrotors with strong coupling and nonlinear *** the present research,an aerodynamic-parameter estimation method and an adaptive attitude control method based on the linear active disturbance rejection controller(LADRC)are designed ***,the motion model,dynamics model,and control allocation model of the quad-rotor are established according to the aerodynamic theory and Newton-Euler ***,a more accurate attitude model of the quad-rotor is obtained by using a tool called CIFER to identify the aerodynamic parameters with large uncertainties in the frequency ***,an adaptive attitude decoupling controller based on the LADRC is designed to solve the problem of the poor anti-interference ability of the quad-rotor and adjust the key control parameter b0 automatically according to the change in the moment of inertia in real ***,the proposed approach is verified on a semi-physical simulation platform,and it increases the tracking speed and accuracy of the controller,as well as the anti-disturbance performance and robustness of the control *** paper proposes an effective aerodynamic-parameter identification method using CIFER and an adaptive attitude decoupling controller with a sufficient anti-interference ability.

关键词： Quad-rotor Qarameters identification CIFER Adaptive LADRC

Effects and mechanisms of acupuncture on women related health

在线全文

学校读者我要写书评

暂无评论

Frontiers of Medicine 2024年第1期18卷 46-67页

作者： Huichao Qin jiaxing Feng Xiaoke Wu Department of Reproductive Medicine Heilongjiang Provincial HospitalHarbin Institute of TechnologyHarbin150036China Department of Obstetrics and Gynecology First Affiliated HospitalHeilongjiang University of Chinese MedicineHarbin150040China

Globally,public health interventions have resulted in a 30-year increase in women’s life ***,women’s health has not increased when socioeconomic status is ***’s health has become a major public health concern,for those women from developing countries are still struggling with infectious and labor-related diseases,and their counterparts in developed countries are suffering from physical and psychological *** recent years,complementary and alternative medicine has attracted wide attentions with regards to maintaining women’s ***,a crucial component of traditional Chinese medicine,has been used to treat many obstetric and gynecological diseases for thousands of years due to its analgesic and anti-inflammatory effects and its effects on stimulating the sympathetic/parasympathetic nervous *** fully understand the mechanism through which acupuncture exerts its effects in these diseases would significantly extend the list of available interventions and would allow for more reasonable advice to be given to general ***,by searching PubMed and CNKI regarding the use of acupuncture in treating obstetric and gynecological diseases,we aimed to summarize the proven evidence of using acupuncture in maintaining women’s health by considering both its effectiveness and the underlying mechanisms behind its effects.

关键词： acupuncture women health clinical efficacy mechanism

Improving tree health assessment accuracy at low temperatures:considering the effect of trunk ice content on electrical resistance and stress wave tomography

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

Journal of Forestry Research 2023年第5期34卷 1503-1510页

作者： jiaxing Guo Peng Wang Yuting Wang Huadong Xu College of Engineering and Technology Northeast Forestry UniversityHarbin 150040People’s Republic of China Forest Science Research Institute of Tibet Municipality Lhasa 850000People’s Republic of China

Accurate decay detection and health assessment of trees at low temperatures is an important issue for forest management and ecology in cold *** temperature ice formation on tree health assessment is *** electric resistance tomography and stress wave tomography are two widely used methods for the detection of tree decay,this study investigated the effect of ice content on trunk electrical resistance and stress wave velocity to improve tree health assessment *** content,trunk electrical resistance and stress wave velocity using time domain reflectometry were carried out on Larix gmelinii and Populus *** content is based on moisture content *** ice content of both species showed a trend of increasing and then *** was opposite with ambient *** the decrease of temperatures,daily average ice content increased,but the range narrowed gradually and both electrical resistance and stress wave velocity *** increased rapidly near 0℃,mainly caused by ice formation(phase change and freezing of free water)in live *** addition,both are positively correlated with ice *** results suggest that ice content should be considered for improving the accuracy of tree decay detection and health evaluation using electric resistance tomography and stress wave velocity methods under low temperatures.

关键词： Cross-section electrical resistance Cross-section stress wave velocity Ambient temperatures Ice content Wood decay detection Tree heath