检索结果-南通市图书馆

Lipschitz equivalence of fractal sets in R

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2012年第10期55卷 2095-2107页

作者： deng GuoTai he XingGang College of Mathematics and Statistics Central China Normal UniversityWuhan 430079China

Let T（q, D） be a self-similar （fractal） set generated by {fi（x） = 1/q（（x ＋ di）}^Ni=1 where integer q 〉 1and D = {d1, d2 dN} C R. To show the Lipschitz equivalence of T（q, D） and a dust-iik-e T（q, C）, one general restriction is 79 C Q by Peres et al. [Israel] Math, 2000, 117： 353-379]. In this paper, we obtain several sufficient criterions for the Lipschitz equivalence of two self-similar sets by using dust-like graph-directed iterating function systems and combinatorial techniques. Several examples are given to illustrate our theory.

关键词： dust-like graph-directed iterating function systems Lipschitz equivalence self-similar sets

An executable modeling and analyzing approach to C4ISR architecture

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2020年第1期31卷 109-117页

作者： he Hongyue ZHU Weixing LI Ruiyang deng Qiaoyu Institute of Command and Control Engineering Army Engineering University of PLA

To analyze the behavioral model of the command,control,communication,computer,intelligence,surveillance,reconnaissance(C4ISR)architecture,we propose an executable modeling and analyzing approach to ***,the meta concept model of the C4ISR architecture is *** to the meta concept model,we construct the executable meta models of the C4ISR architecture by extending the meta models of ***,we define the concrete syntax and executable activity algebra(EAA)semantics for executable *** semantics functions are introduced to translating the syntax description of executable models into the item of *** support the execution of models,we propose the executable rules which are the structural operational semantics of ***,an area air defense of the C4ISR system is used to illustrate the feasibility of the approach.

关键词： command control communication computer intelligence surveillance reconnaissance(C4ISR)architecture meta model executable model algebraic semantics

Novel compact and lightweight coaxial C-band transit-time oscillator

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第9期29卷 384-389页

作者： Xiao-Bo deng jun-Tao he jun-Pu Ling Bing-Fang deng Li-Li Song Fu-Xiang Yang Wei-Li Xu College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

Compactness and miniaturization have become increasingly important in the development of high-power microwave *** on this rising demand,a novel C-band coaxial transit-time oscillator(TTO)with a low external guiding magnetic field is proposed and *** proposed device has the following advantages:simple structure,short axial length,high power conversion efficiency,and low external guiding magnetic field,which are of great significance for developing the compact and miniaturized high-power microwave *** application of a shorter axial length is made possible by the use of a transit radiation ***,loading the opening foil symmetrically to both ends of the buncher helps reduce the external magnetic field of the proposed *** traditional foils,the proposed opening foil has a circular-hole;therefore,the electron beam will not bombard the conductive foil to generate *** makes it possible to realize long pulse and high repetition rate operation of the device in future *** numerical calculation and PIC particle simulation,the stability of the intense relativistic electron beam(IREB)and the saturation time of the device are improved by using the conductive *** voltage and current of the diode are 548 kV and 11.4 kA,*** a 0.4-T external guiding magnetic field,a C-band output microwave with a frequency of 4.27 GHz and power of 1.88 GW can be *** power conversion efficiency of the proposed device is about 30%.

关键词： low guiding magnetic field foil focus simple structure short axial length

在线全文

学校读者我要写书评

暂无评论

身心性命:宋明理学的历史阐释与现代建构

河南社会科学 2025年第1期33卷 102-110页

作者：邓国坤浙江大学哲学学院浙江杭州310058 贵州大学哲学学院贵州贵阳550000

身心性命之学乃是宋明理学的一种历史阐释范式,也是现代学者对于宋明理学的新建构。身心性命阐释为宋代至今的学者一直使用,它不仅是宋明理学的概称,而且指向宋明理学的主要内涵或旨向,包括身心之学、性理之学、天命之学。它既包含内圣... 详细信息

身心性命之学乃是宋明理学的一种历史阐释范式,也是现代学者对于宋明理学的新建构。身心性命阐释为宋代至今的学者一直使用,它不仅是宋明理学的概称,而且指向宋明理学的主要内涵或旨向,包括身心之学、性理之学、天命之学。它既包含内圣的维度,也包含外王的维度。身心性命阐释涵具身心—性理—天命的思想结构:由身心而通达性理,由性理而通达天命。在此基础上构建起来的新理论可称为身心性命之学。它的特征包括以身、心、性、命的统一体为研究领域;以身心、性理、天命的次第研究为进路;具有体用合一,由实践而超越的途径,以天人合一为终极理想的基本特征。它指明了宋明理学的研究领域、思想结构、主要特征等,为今人阐释与重构宋明理学提供了一个新的思路与经验。

关键词：宋明理学身心性理天命

Solidification in Soft-Contact Continuous Casting Mold with Alternating Electromagnetic Field

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2003年第1期10卷 15-19页

作者： deng An-yuan he Ji-cheng Northeastern University

The mechanical behavior of the mushy zone was studied in detail. Based on the analysis of conventional high temperature mechanical model, considering the physical phenomenon in casting process, a mechanical model suitable for describing the mechanical behavior of the casting material in twin roll casting process was built. Comparing experimental results to the numerical simulated ones, the mechanical model was proved to be correct.

关键词： strip casting mushy zone mechanical model constitutive equation

Durability classification of red beds rocks in central Yunnan based on particle size distribution and slaking procedure

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2019年第3期16卷 714-724页

作者： ZHU jun-jie deng Hui State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology

Moisture induced disintegration of soft rock in Red Beds is common all over the world. The slake durability index test is most useful to quantify durability of the soft rocks. Based on a series of slaking test, this article aims to develop a durability classification involving particle size and slaking procedure. To describe the slaking procedure in detail,the Relative Slake Durability Index(Id_i) is proposed. The Id_i is the percentage ratio of the i^(th) weight of oven-dry retained portion to the(i-1)^(th) weight of ovendry retained portion. Results show that the Id_i of samples have a large difference in certain slaking procedure, whereas the traditional Durability Slake Index(Id) is almost constant. Considering this limitation of Id in durability classification, an advanced classification by applying the Id_i and disintegration ratio(DR) is further established in this article. Compared to the durability classification based on Slake Durability Index(Id), the new classification accounts for the particle size of the slaked material and the slaking procedure, so it provides a better measure of the degree of slaking. The classification recommended in this article divide the slake durability into three classes(i.e., low, medium and high class). Furthermore, it divides both the low class and the medium class into 3 subclasses.

关键词： Slaking test Durability classification Relative durability index Durability index Disintegrate rate

Auto-ignition and stabilization mechanism of diluted H_2 jet flame

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第2期12卷 154-161页

作者： Wei FENG Zhi-jun WU jun deng Li-guang LI Key Laboratory for Power Machinery and Engineering of Ministry of Education Shanghai Jiao Tong University Shanghai 200030 China School of Automotive Studies Tongji University Shanghai 200092 China

The controllable active thermo-atmosphere combustor(CATAC) has become a utilizable and effective facility because it benefits the optical diagnostics and modeling. This paper presents the modeling research of the auto-ignition and flames of the H2/N2(H2/CH4/N2,or H2/H2O2/N2) mixture on a CATAC,and shows curves varying with temperatures of auto-ignition delay,the height of the site of auto-ignition of lifted flames,and flame lift-off height. The results of auto-ignition delay and the lift-off height are compared the experimental results to validate the model. A turning point can be seen on each curve,identified with criterion temperature. It can be concluded that when the co-flow temperature is higher than the criterion temperature,the auto-ignition and lifted flame of the mixture are not stable. Conversely,below the criterion temperature,the mixture will auto-ignite in a stable fashion. Stabilization mechanisms of auto-ignition and lifted flames are analyzed in terms of the criterion temperature.

关键词： Simulation Combustor Auto-ignition Jet flame Stabilization mechanism

Design and voice‐based control of a nasal endoscopic surgical robot

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2021年第1期6卷 123-131页

作者： Yucheng he Zhen deng Jianwei Zhang Department of Mechanical and Automation Engineering Chinese University of Hong KongHong KongChina Department of Informatics University of HamburgHamburgGermany

In traditional nasal surgery,surgeons are prone to fatigue and jitter by holding the endoscope for a long‐*** complex operations require assistant surgeon to assist with holding the *** address the above problems,the authors design a remote centre of motion based nasal robot,and propose a voice‐based robot control ***,through the operation space analysis of nasal surgery,the design scheme of the robot based on RCM mechanism is *** this basis,the design parameters of the robot are analysed to complete the entire design of ***,considering that the surgeon's hands are occupied by surgical instruments during complex surgical operations,a voice‐based robot control method is *** method obtains direction instructions from surgeons by analysing the movement of the endoscopic ***,a commercial speech recognition interface is used to realise the offline grammar controlwords lib compatible with both Chinese and English,and the overall strategy of robot control is ***,an experimental platform for virtual robot control is established,and the voice‐based robot control experiment is *** results show that the proposed voice‐based control method is feasible,and it provides guidance for the subsequent development and control of the actual robot system.

关键词： robot nasal operations

A Well-Conditioned, Nonconforming Nitsche’s Extended Finite Element Method for Elliptic Interface Problems

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

Numerical Mathematics(Theory,Methods and Applications) 2020年第1期13卷 99-130页

作者： Xiaoxiao he Fei Song Weibing deng Department of Mathematics Nanjing UniversityNanjing 210093JiangsuChina Department of Applied Mathematics Nanjing Forestry UniversityNanjing 210037JiangsuChina

In this paper,we introduce a nonconforming Nitsche’s extended finite element method(NXFEM)for elliptic interface problems on unfitted triangulation *** solution on each side of the interface is separately expanded in the standard nonconforming piecewise linear polynomials with the edge averages as degrees of *** jump conditions on the interface and the discontinuities on the cut edges(the segment of edges cut by the interface)are weakly enforced by the Nitsche’s *** the method,the harmonic weighted fluxes are used and the extra stabilization terms on the interface edges and cut edges are added to guarantee the stability and the well *** prove that the convergence order of the errors in energy and L 2 norms are ***,the errors are independent of the position of the interface relative to the mesh and the ratio of the discontinuous ***,we prove that the condition number of the system matrix is independent of the interface *** examples are given to confirm the theoretical results.

关键词： Elliptic interface problems NXFEM nonconforming finite element condition number