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Acta Mathematica Sinica,English Series 2013年第5期29卷 943-958页

作者： rong Kun ZHUANG rong YUAN Department of Mathematics Huizhou University School of Mathematical Sciences Beijing Normal University

In this paper, we present some existence theorems for pseudo-almost periodic solutions of differential equations with piecewise constant argument by means of pseudo-almost periodic solutions of relevant difference equ... 详细信息

关键词： Pseudo-almost periodic solutions pseudo-almost periodic sequences neutral delay equation piecewise constant argument

Higher-mode effect on the seismic responses of buildings with viscoelastic dampers

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Earthquake Engineering and Engineering Vibration 2002年第1期1卷 119-129页

作者： Meng-Hao tsai Department of Civil Engineering Taiwan UniversityChinese Taipei Postdoctoral Research Fellow

In conventional modal analysis procedures,usually only a few dominant modes are required to describe the dynamic behavior of multi-degrees-of-freedom *** number of modes needed in the dynamic analysis depends on the higher-mode contribution to the structural response,which is called the higher-mode *** modal analysis approach, however,may not be directly applied to the dynamic analysis of viscoelastically damped *** is because the dynamic properties of the viscoelastic dampers depend on their vibration ***,the structural stiffness and damping contributed from those dampers would be different for each *** this study,the higher-mode effect is referred to as the response difference induced by the frequency-dependent property of viscoelastic dampers at higher *** analysis procedures for buildings with viscoelastic dampers distributed proportionally and non-proportionally to the stiffness of the buildings are developed to consider the higher-mode *** studies on shear-type viscoelastically damped building models are conducted to examine the accuracy of the proposed procedures and to investigate the significance of the higher-mode effect on their seismic *** damper models are used to estimate the peak damper forces in the proposed procedures. Study results reveal that the higher-mode effect is significant for long-period viscoelastically damped *** higher-mode effect on base shear is less significant than on story acceleration *** difference of the seismic response usually occurs at the top ***,the higher-mode effect may not be reduced by decreasing the damping ratio provided by the viscoelastic *** practical application,it is realized that the linear viscous damping model without considering the higher-mode effect may predict larger damper forces and hence,is on the conservative side.

关键词： model analysis viscoelastic dampers higher-mode effect

Weighted Pseudo Almost Periodic Solutions of N-th Order Neutral Differential Equations with Piecewise Constant Arguments

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Acta Mathematica Sinica,English Series 2014年第7期30卷 1259-1272页

作者： rong Kun ZHUANG rong YUAN Department of Mathematics Huizhou University School of Mathematical Sciences Beijing Normal University

In this work, we present some existence theorems of weighted pseudo almost periodic solutions for N-th order neutral differential equations with piecewise constant argument by means of weighted pseudo almost periodic ... 详细信息

关键词： Weighted pseudo almost periodic sequence weighted pseudo almost periodic solution,neutral differential equation piecewise constant arguments

The smoothed finite element method (S-FEM):A framework for the design of numerical models for desired solutions

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Frontiers of Structural and Civil Engineering 2019年第2期13卷 456-477页

作者： Gui-rong Liu Department of Aerospace Engineering and Engineering Mechanics University of CincinnatiCincinnati 45219USA

The smoothed finite element method (S-FEM) was originated by G R Liu by combining some meshfree techniques with the well-established standard finite element method (FEM). It has a family of models carefully designed with innovative types of smoothing domains. These models are found having a number of important and theoretically profound properties. This article first provides a concise and easy-to-follow presentation of key formulations used in the S-FEM. A number of important properties and unique features of S-FEM models are discussed in detail, including 1) theoretically proven softening effects;2) upper-bound solutions;3) accurate solutions and higher convergence rates;4) insensitivity to mesh distortion;5) Jacobian?free;6) volumetric-locking-free;and most importantly 7) working well with triangular and tetrahedral meshes that can be automatically generated. The S-FEM is thus ideal for automation in computations and adaptive analyses, and hence has profound impact on Al-assisted modeling and simulation. Most importantly, one can now purposely design an S-FEM model to obtain solutions with special properties as wish, meaning that S-FEM offers a framework for design numerical models with desired properties. This novel concept of numerical model demand may drastically change the landscape of modeling and simulation. Future directions of research are also provided.

关键词： computational method finite element method smoothed finite element method strain smoothing technique smoothing domain weakened weak form solid mechanics softening effect upper bound solution

Synthesis,Crystal Structure and Fluorescent Properties of 1-(4-(Dimethylamino)benzylidene)-4-(naphthalen-1-yl) Thiosemicarbazide

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Chinese Journal of Structural Chemistry 2006年第10期25卷 1197-1202页

作者： YU Yun LIN Li-rong HUANG rong-Bin Department of Chemistry Longyan College Longyan Fujian 364000 China Department of Chemistry Xiamen University Xiamen 361005 China

The title compound, 1-4-（dimethylamino）benzylidene）-4-（naphthalene-1-yl） thiosemicarbazide （DMABNTS, C20H20N4S, Mr = 348.47）, was synthesized and characterized by elemental analysis, 1R, ^1H NMR and MS. The crystal structure of DMABNTS with 1,4-dioxane （Diox, C4H8O2） solvent molecules （DMABNTS·2Diox, C28H36N4O4S, Mr = 524.67） was determined by single-crystal X-ray diffraction. The crystal belongs to monoclinic system, space group P21/c with a = 14.418（4）, b = 7.1702（19）, c = 28.350（7）°A,β= 101.154（6）°, V= 2875.4（13） °A^3, Z= 4, Dc= 1.212 g/cm^3, F（000） = 1120 and μ= 0.151 mm^-1. A total of 6458 reflections were collected, of which 4671 were unique. The structure was solved by direct methods and refined to the final R = 0.0732 and wR = 0.2127 for 3921 observed reflections （I〉 2σ（I））. There exist intermolecular hydrogen bonds （N（2）-H（2B）…S（1A）and N（1）-H（1A）…O（4B）） in the structure. The study of fluorescent properties ＇shows that DMABNTS emits bright solid-state fluorescence in the visible region and exhibits blue photoluminescence.

关键词： 1-(4-(dimethylamino)benzylidene)-4-(naphthalen- 1-yl)thiosemicarbazide synthesis crystal structure fluorescence

黑磷/黑砷异质结纳米器件热电性质应力调控研究

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原子与分子物理学报 2025年第1期42卷 69-74页

作者：戎杙邱乙峰张蓓新疆大学物理科学与技术学院乌鲁木齐830046

探索新型高性能低维热电纳米材料已成为国家重大发展策略.论文采用密度泛函理论结合非平衡态格林函数方法研究了由黑磷、黑砷纳米带构建异质结构在2%、4%、6%和8%四种拉伸应变作用下热电性能调控机理.研究结果表明,6%拉伸应变较其他情形... 详细信息

探索新型高性能低维热电纳米材料已成为国家重大发展策略.论文采用密度泛函理论结合非平衡态格林函数方法研究了由黑磷、黑砷纳米带构建异质结构在2%、4%、6%和8%四种拉伸应变作用下热电性能调控机理.研究结果表明,6%拉伸应变较其他情形,能够更有效抑制声子输运行为;与此同时,拉伸应变对于器件的电子输运的调控效果并不明显.在费米能附近,黑磷/黑砷异质结纳米器件在6%拉伸应变调控下热电优值达到最大值2.31.

关键词：黑磷黑砷异质结应力热电性质

A novel multisignature scheme for a special verifier group against clerk and rogue-key attacks

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第4期11卷 290-295页

作者： Jia-lun tsai Tzong-chen WU Kuo-yu tsai Department of Information Management National Taiwan University of Science and Technology Taiwan Information Security Center National Taiwan University of Science and Technology

The digital signature is a very important subject for network *** multiple signers and multiple verifiers,Xie and Yu(2004) pointed out that the multisignature scheme of Laih and Yen(1996) is vulnerable to a harmful *** attack can occur when a specified group of verifiers cooperate to forge a multisignature by secret key substitution following the leak of a secret key or by group public key adjustment during the process of renewing *** and Yu proposed an improvement of Laih and Yen's multisignature *** this paper,we show that Xie and Yu's scheme is vulnerable to clerk and rogue-key *** propose an improved multisignature scheme to resist such *** the proposed scheme,multiple signers can generate a multisignature for the message with the signers' secret keys,and the specified group of verifiers can cooperate to verify the validity of the multisignature with the signers' public keys and the verifiers' secret *** proposed scheme for a special verifier group not only has the advantages of Xie and Yu's scheme,but also is secure against clerk and rogue-key attacks.

关键词： Multisignature Clerk attack Rogue-key attack Cryptosystem

The IOCAS intermediate coupled model(IOCAS ICM) and its real-time predictions of the 2015–2016 El Nio event

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Science Bulletin 2016年第13期61卷 1061-1070页

作者： rong-Hua Zhang Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of SciencesQingdao 266071 China Laboratory for Ocean and Climate Dynamics Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237 China University of Chinese Academy of Sciences Beijing 100049 China

The tropical Pacific is currently experiencing an El Nifio event. Various coupled models with different degrees of complexity have been used to make real-time E1 Nifio predictions, but large uncertainties exist in the inten- sity forecast and are strongly model dependent. An intermediate coupled model （ICM） is used at the Institute of Oceanology, Chinese Academy of Sciences （IOCAS）, named the IOCAS ICM, to predict the sea surface temper- ature （SST） evolution in the tropical Pacific during the 2015-2016 E! Nifio event. One unique feature of the IOCAS ICM is the way in which the temperature of subsurface water entrained in the mixed layer （Te） is parameterized. Observed SST anomalies are only field that is utilized to initialize the coupled prediction using the IOCAS ICM. Examples are given of the model＇s ability to predict the SST conditions in a real-time manner. As is commonly evident in E1 Nifio- Southern Oscillation predictions using coupled models, large discrepancies occur between the observed and pre- dicted SST anomalies in spring 2015. Starting from early summer 2015, the model can realistically predict warming conditions. Thereafter, good predictions can be made through the summer and fall seasons of 2015. A transition to normal and cold conditions is predictecl to occur in rote spring 2016. Comparisons with other model predictions are made and factors influencing the prediction performance of the IOCAS ICM are also discussed.

关键词： The 2015 E1 Nifio event IOCAS ICM Real-time prediction Model performance and improvement Air-sea interactions

State synchronization in process-oriented chaincode

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Frontiers of Computer Science 2019年第6期13卷 1166-1181页

作者： Lian YU Wei-Tek tsai School of Software&Microelectronics Peking UniversityBeijing 102600China State Key Laboratory of Software Development Environment School of Computer Science&EngineeringBeihang UniversityBeijing 100191China Comp. Info.and Dec.Systems EngineeringArizona State UniversityTempeAZ 85287USA

Business processes often involve operational processes,contracts,and *** modeling of such processes must address regulation monitoring and enforcement and maintain a reliable history of data for *** study proposes modeling business processes as chaincode(CC)on permissioned blockchains(BCs).The challenges encountered by the proposed approach are state synchronizations among distributed nodes(called authnodes)and realtime *** study separates CC executions from the state management of multiple BCs and demonstrates the validity of the proposed approach with a payment authorization system at a Chinese bank.

关键词： blockchains state synchronization chaincode permissioned blockchains concurrent block building

Convergence in Distribution for Uncertain Random Sequences with Dependent Random Variables

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Journal of Systems Science & Complexity 2021年第2期34卷 483-501页

作者： GAO rong AHMADZADE Hamed School of Economics and Management Hebei University of TechnologyTianjin 300401China Department of Mathematical Sciences University of Sistan and BaluchestanZahedanIran

Random variables and uncertain variables are respectively used to model randomness and uncertainty. While randomness and uncertainty always coexist in a same complex system. As an evolution of random variables and uncertain variables, uncertain random variable is introduced as a tool to deal with complex phenomena including randomness and uncertainty simultaneously. For uncertain random variables, a basic and important topic is to discuss the convergence of its ***, this paper focuses on studying the convergence in distribution for a sequence of uncertain random sequences with different chance distributions where random variables are not *** the result of this paper is a generalization of the existing literature. Relations among convergence theorems are studied. Furthermore, the theorems are explained by several examples.

关键词： Chance distribution convergence in distribution convergence in mean uncertain random variable