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| 1 | Synthesis and characterization of oriented linked LiFePO4 nanoparticles with fast electron and ion transport for high-power lithium-ion batteries显示文摘有不同形态学和尺寸的 LiFePO 4 nanoparticles 作为表面活化剂用环境地良性、便宜的甘油经由一个 solvothermal 方法被综合。粒子的形态学,尺寸,和结构被发现仔细联系到甘油的集中。面向非主要连接了 LiFePO 4 nanorods --[010 ] 与甘油的合适的集中被获得。nanorods 显示出好电子、离子的传导性,导致优异的率能力和骑车的性能。这表演非主要被归因于面向的连接[010 ] ,小粒子尺寸沿着[010 ] ,并且在 Fe 地点的李的职业。162.4 | Yi Jiang Ruiyuan Tian Haiqiang Liu Jiankun Chen Xinghua Tan Lina Zhang Guangyao Liu Hanfu Wang Lianfeng Sun Weiguo Chu | 2015 | Nano Research2015，8，12： | 4 |
| 2 | Markov chain approach to identifying Wiener systems显示文摘Identification of the Wiener system composed of an infinite impulse response (IIR) linear subsystem followed by a static nonlinearity is considered.The recursive estimates for unknown coefficients of the linear subsystem and for the values of the nonlinear function at any fixed points are given by the stochastic approx-imation algorithms with expanding truncations (SAAWET).With the help of properties of the Markov chain connected with the linear subsystem,all estimates derived in the paper are proved to be strongly consistent.In comparison with the existing results on the topic,the method presented in the paper simplifies the convergence analysis and requires weaker conditions.A numerical example is given,and the simulation results are consistent with the theoretical analysis. | ZHAO WenXiao CHEN HanFu | 2012 | Science China(Information Sciences)2012，55，5： | 4 |
| 3 | Annular flexible thermoelectric devices with integrated-module architecture显示文摘Organic and composite thermoelectric(TE)materials have witnessed explosive developments in recent years.Design strategy of their flexible devices is vital to achieve high performance and suit various application environments.Here,we propose a design strategy of annular flexible TE devices with integrated-module architecture,where the independent modules made up of alternatively connected p-n couples are connected in series,and then rounded head-to-tail into annular configuration.The achieved devices can not only save plenty of space owing to their highly integrated structure design,but also be directly mounted on cylindrical objects(like pipes)to suit versatile applications.More importantly,the annular TE devices display excellent performances,superior to most previous work and the traditional serial single-layer film structure.For example,the annular device with eight modules consisting of three p-n couples reveals an output power of 12.37μW at a temperature gradient of 18 K,much higher than that of the corresponding single-layer film structure(1.74μW).The integration process is simple and easy to scale up.This architecture design strategy will greatly speed up the TE applications and benefit the research of organic and composite TE materials. | Dawei Qu Xuan Huang Xin Li Hanfu Wang Guangming Chen | 2020 | npj Flexible Electronics2020，4，1： | 3 |
| 4 | Identification of Wiener systems with nonlinearity being piecewise-linear function显示文摘Identification of the Wiener system with the nonlinear block being a piecewise-linear function is considered in the paper, generalizing the results given by H. E. Chen to the case of noisy observation. Recursive algorithms are given for estimating all unknown parameters contained in the system, and their strong consistency is proved. The estimation method is similar to that used by H. E. Chen for Hammerstein systems with the same nonlinearity. However, the assumption imposed by H. E. Chen on the availability of an upper bound for the nonsmooth points of the piecewise-linear function has been removed in this paper with the help of designing an additional algorithm for estimating the upper bound. | HUANG YiQing CHEN HanFu FANG HaiTao | 2008 | Science in China(Series F)2008，51，1： | 3 |
| 5 | Recursive identification for EIV ARMAX systems显示文摘The input uk and output yk of the multivariate ARMAX system A(z)yk = B(z)uk + C(z)wk are observed with noises: ukob uk + △uk and ykob yk + △yk, where ∈ku and ∈yk denote the observation noises. Such kind of systems are called errors-in-variables (EIV) systems. In the paper, recursive algorithms based on observations are proposed for estimating coefficients of A(z), B(z), C(z), and the covariance matrix Rw of wk without requiring higher than the second order statistics. The algorithms are convenient for computation and are proved to converge to the system coefficients under reasonable conditions. An illustrative example is provided, and the simulation results are shown to be consistent with the theoretical analysis. | CHEN HanFu | 2009 | Science in China(Series F)2009，52，11： | 2 |
| 6 | IDENTIFICATION OF BOTH CLOSED-AND OPEN-LOOP STOCHASTIC SYSTEM WHILE STABILIZING IT显示文摘This paper proposes a recursive algorithm estimating coefficients of the linear stochastic control system(ARX system) driven by a martingale difference sequence, while adaptively stabilizing the system without introducing external excitation signal. The system is allowed to be unstable and of nonminimum-phase. The estimates derived for the coefficients of both closed-loop and open-loop systems are strongly consistent. | CHEN Hanfu(Han-Fu Chen) (Laboratory of Systems and Control,Institute of Systems Science, Academy of Mathematics and Systems Science,Chinese Academy of Sciences, Beijing 100080, China) | 2002 | Journal of Systems Science & Complexity2002，15，1： | 2 |
| 7 | IDENTIFICATION FOR WIENER SYSTEMS WITH INTERNAL NOISE显示文摘这篇论文考虑内部变量和产量被噪音为贿赂的维纳系统的鉴定。内部噪音什么时候是独立人士并且相等的一个序列,散布了(i 标志) Gaussian 随机的变量,没有内部噪音,由 Weierstrass 转变(WT ) ,在考虑下面的系统转弯是一个维纳系统。后者的非线性的部分不是比原来的系统的非线性的函数的 WT 另外的任何东西,当线性分系统是为在 WT 前后的两个系统的一样时。在合理条件下面,递归的鉴定算法为转变维纳系统被建议,并且为估计的强壮的一致性被建立。由使用反的 WT,为原来的系统的非线性的非参量的估计被导出,并且如果在原来的系统的非线性是一个多项式,他们是强烈历久不渝的。类似的结果也控制内部噪音是 non-Gaussian 的情况。模拟结果与理论分析充分一致。 | Qijiang SONG Hanfu CHEN | 2008 | Journal of Systems Science & Complexity2008，21，3： | 2 |
| 8 | Convergence rate of least squares identification and adaptive control for stochastic systems显示文摘 | CHEN Hanfu GUO Lei | 1986 | Int J Control1986，44，5： | 1 |
| 9 | Convergence rate of ordinal optimization for stochastic discrete event systems显示文摘 | Tang Qianyu Chen Hanfu | 1999 | Discrete Event Dynamic Systems: Theory and Applications1999，9，1： | 1 |
| 10 | The Astrom-Wittenmark self-tuning regulator revisited and ELS based adaptive trackers显示文摘 | GUO Lei CHEN Hanfu | 1991 | IEEE Trans on Automatic Control1991，36，7： | 1 |
| 11 | Recursive identification for multidimensional ARMA processes with increasing variances显示文摘In time series analysis, almost all existing results are derived for the case where the driven noise {wn} in the MA part is with bounded variance (or conditional variance). In contrast to this, the paper discusses how to identify coefficients in a multidimensional ARMA process with fixed orders, but in its MA part the conditional moment E(||wn|| βFn-1), β> 2 is possible to grow up at a rate of a power of log n. The well-known stochastic gradient (SG) algorithm is applied to estimating the matrix coefficients of the ARMA process, and the reasonable conditions are given to guarantee the estimate to be strongly consistent. | CHEN Hanfu | 2005 | Science in China(Series F)2005，48，5： | 1 |
| 12 | A Wavy-Structured Highly Stretchable Thermoelectric Generator with Stable Energy Output and Self-Rescuing Capability显示文摘Thermoelectric generators(TEGs)demonstrate great potential for flexible and wearable electronics due to the direct electrical energy harvested from waste heat.Good wearability requires high mechanical flexibility and preferable stretchability,while current TEGs are primarily developed with rigid or non-stretchable components,which do not conform well to human skin or accommodate human motions,thus hindering further applications. | Zhuoxin Liu Xiaodong Wang Shasha Wei Haicai Lv Jiaqian Zhou Peng Peng Hanfu Wang Guangming Chen | 2021 | CCS Chemistry2021，3，10： | 1 |
| 13 | Tailoring microstructure and electrical transportation through tensile stress in Bi_(2)Te_(3) thermoelectric fibers显示文摘Bismuth telluride(Bi_(2)Te_(3))has attracted much attention in the field of thermoelectrics since it is one kind of commercial room-temperature thermoelectric material.Herein three kinds of Bi_(2)Te_(3) thermoelectric fibers with internal tensile stress are fabricated utilizing an optical fiber template method.The effects of internal stress on the microstructure and the electrical transportation of Bi_(2)Te_(3) thermoelectric fibers are investigated.The Bi_(2)Te_(3) cores in the fibers are highly crystalline and possess a tensile nanosheet structure with preferential orientation as evidenced by X-ray diffraction and Raman studies.Tensile stress can enhance electrical properties of the fibers.And a paper cup generator covered with 20 pieces of optimized fibers provides a μW-level output power.It is inferred that tensile stress tuning can be an effective tool for the material optimization of thermoelectric performance. | Min Sun Guowu Tang Bowen Huang Zhongjia Chen Yu-Jun Zhao Hanfu Wang Ziwen Zhao Dongdan Chen Qi Qian Zhongmin Yang | 2020 | Journal of Materiomics2020，6，3： | 0 |
| 14 | BEHAVIOR OF STOCHASTIC APPROXIMATIONALGORITHM IN ROOT SET OF REGRESSIONFUNCTION显示文摘By convergence of a stochastic approximation (SA) algorithm one usually means that the distance d(xn, J) between the estimate xn given by the algorithm and the root set J of the regression function tends to zero. This paper characterizes the properties of the limit points of xn. An illustrative example is given to show that xn may move about in J even thought d(xn, J) 0. Finally, the paper gives conditions guaranteeing not only d(xn, J)0 but also the convergence of {xn} itself in the one-dimensional case. | WANG Guanjun CHEN Hanfu (Institute of Systems Science, Academia of Sinica, Beijing 100080, China) | 1999 | Systems Science and Mathematical Sciences1999，12，1： | 0 |
| 15 | CONTINUOUS-TIME KIEFER-WOLFOWITZ ALGORITHM WITH RANDOMIZED DIFFERENCES显示文摘A continuous-time Kiefer-Wolfowitz algorithm with randomized differences andwith truncations at randomly varying bounds is proposed. It is shown that the algorithmconverges to the desired value almost surely under mild conditions. The rate of convergenceand the asymptotic normality of the algorithm are also established. | CHEN Hanfu WANG Qian(Institute Of Systems Science, Academia Silica, Beijing 100080, China) | 1998 | Systems Science and Mathematical Sciences1998，11，4： | 0 |
| 16 | CONTINUOUS-TIME STOCHASTIC ADAPTIVE CONTROL STABILIZING THE SYSTEM AND MINIMIZING THE QUADRATIC LOSS FUNCTION显示文摘CONTINUOUS-TIMESTOCHASTICADAPTIVECONTROLSTABILIZINGTHESYSTEMANDMINIMIZINGTHEQUADRATICLOSSFUNCTIONCHENHanfu(InstituteofSystems... | CHEN Hanfu(Institute of Systems Science, Academia Sinica, Beijing 100080 China) | 1995 | Systems Science and Mathematical Sciences1995，8，2： | 0 |
| 17 | ADAPTIVE STOCHASTIC APPROXIMATION FOR MEASUREMENT WITH CORRELATED NOISE显示文摘A multidimensional adaptive stochastic approximation procedure trun-cated at randomly varying bounds is studied for the regression function observedwith correlated noise.The algorithm is proved to be asymptotically efficient.Theresult of the paper generalizes the one shown in[1]for the observation noise be-ing i.i.d.random vectors and under other restrictive conditions imposed on theregression function. | GAO Aijun (Institute of Mathematical Sciences,Chengdu Branch,Academia Sinica,Chengdu 610015,China)CHEN Hanfu(H.F.Chen) (Institute of Systems Science,Academia Sinica,Beijing 100080,China) | 1992 | Systems Science and Mathematical Sciences1992，5，3： | 0 |
| 18 | Construction of a cement-rebar nanoarchitecture for a solution-processed and flexible film of a Bi_(2)Te_(3)/CNT hybrid toward low thermal conductivity and high thermoelectric performance显示文摘Solution processability and flexibility still remain major challenges for many thermoelectric(TE)materials,including bismuth telluride(Bi_(2)Te_(3)),a typical and commercially available TE material.Here,we report a new solutionprocessed method to prepare a flexible film of a Bi_(2)Te_(3)/single-walled carbon nanotube(SWCNT)hybrid,where the dissolved Bi_(2)Te_(3) ion precursors are mixed with dispersed SWCNTs in solution and recrystallized on the SWCNT surfaces to form a“cement-rebar”-like architecture.The hybrid film shows an n-type characteristic,with a stable Seebeck coefficient of^(−1)00.00±1.69μVK^(−1) in air.Furthermore,an extremely low in-plane thermal conductivity of∼0.33Wm^(−1) K^(−1) is achieved at 300 K,and the figure of merit(ZT)reaches 0.47±0.02.In addition,the TE performance is independent of mechanical bending.The unique“cement-rebar”-like architecture is believed to be responsible for the excellent TE performances and the high flexibility.The results provide a new avenue for the fabrication of solution-processable and flexible TE hybrid films and will speed up the applications of flexible electronics and energy conversion. | Zhijun Chen Haicai Lv Qichun Zhang Hanfu Wang Guangming Chen | 2022 | Carbon Energy2022，4，1： | 0 |
| 19 | NOISY OBSERVATION BASED STABILIZATION AND OPTIMIZATION FOR UNKNOWN SYSTEMS显示文摘The paper addresses optimization of a performance function which either is optimized via stabilizing and controlling the underlying unknown system or is directly optimized on the basis of its noise-corrupted observations. For the first case the unknown system is identified and then the indirect adaptive control approach is applied to optimize the performance function. For the second case the stochastic approximation method is used to optimize the objective function, and it appears that a number of problems arising from applications may be reduced to the one solvable by this approach. The paper demonstrates some basic results in the area, but with no intention to give a complete survey. | CHEN Hanfu(Han-Fu Chen)(Laboratory of Systems and Control Institute of Systems Science, Academy of Mathematics and Systems, Science Chinese Academy of Sciences, China) | 2003 | Journal of Systems Science & Complexity2003，16，3： | 0 |
| 20 | Task scheduling for transport and pick robots in logistics:a comparative study on constructive heuristics显示文摘We study the Transport and Pick Robots Task Scheduling(TPS)problem,in which two teams of specialized robots,transport robots and pick robots,collaborate to execute multi-station order fulfillment tasks in logistic environments.The objective is to plan a collective time-extended task schedule with the minimization of makespan.However,for this recently formulated problem,it is still unclear how to obtain satisfying results efficiently.In this research,we design several constructive heuristics to solve this problem based on the introduced sequence models.Theoretically,we give time complexity analysis or feasibility guarantees of these heuristics;empirically,we evaluate the makespan performance criteria and computation time on designed dataset.Computational results demonstrate that coupled append heuristic works better for the most cases within reasonable computation time.Coupled heuristics work better than decoupled heuristics prominently on instances with relative few pick robot numbers and large work zones.The law of diminishing marginal utility is also observed concerning the overall system performance and different transport-pick robot numbers. | Hanfu Wang Weidong Chen | 2021 | Autonomous Intelligent Systems2021，1，1： | 0 |
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