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基于MC9S12XS128模数混合式比例控制放大器的实验研究 被引量:1
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作者 强彦 赵春丽 +3 位作者 魏列江 王亚强 李维 罗小梅 《测控技术》 2021年第1期78-82,共5页
针对数字式比例控制放大器和模拟式比例控制放大器在实际工程应用中的不足,提出一种基于MC9S12XS128单片机的模数混合式比例控制放大器。其控制算法通过模数混合PID控制器来实现,单片机对模数混合PID控制器中数字电位器的值进行调节并... 针对数字式比例控制放大器和模拟式比例控制放大器在实际工程应用中的不足,提出一种基于MC9S12XS128单片机的模数混合式比例控制放大器。其控制算法通过模数混合PID控制器来实现,单片机对模数混合PID控制器中数字电位器的值进行调节并记忆存储。利用Tina仿真软件,对模数混合式比例控制放大器电路进行了仿真。该电路已进行了实物测试。从仿真研究和实验测试可得,所设计的基于MC9S12XS128模数混合式比例控制放大器符合设计要求。研究结果为模数混合式比例控制放大器的设计开发提供了依据。 展开更多
关键词 MC9S12XS128单片机 模数混合式比例控制放大器 模数混合PID控制器 数字电位器
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Product reliability assessment based on proportional hazard degradation model 被引量:4
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作者 苏春 张烨 张恒 《Journal of Southeast University(English Edition)》 EI CAS 2010年第3期480-483,共4页
In order to evaluate the reliability of long-lifetime products with degradation data, a new proportional hazard degradation model is proposed. By the similarity between time-degradation data and stress-accelerated lif... In order to evaluate the reliability of long-lifetime products with degradation data, a new proportional hazard degradation model is proposed. By the similarity between time-degradation data and stress-accelerated lifetime, and the failure rate function of degradation data which is assumed to be proportional to the time covariate, the reliability assessment based on a proportional hazard degradation model is realized. The least squares method is used to estimate the model's parameters. Based on the failure rate of the degradation data and the proportion function of the known time, the failure rate and the reliability function under the given time and the predetermined failure threshold can be extrapolated. A long life GaAs laser is selected as a case study and its reliability is evaluated. The results show that the proposed method can accurately describe the degradation process and it is effective for the reliability assessment of long lifetime products. 展开更多
关键词 degradation data hazard function proportional hazard model reliability assessment
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Numerical Simulations on Countercurrent Gas-Liquid Flow in a PWR Hot Leg with Air-Water Flow in a 1/15th Scale-Model 被引量:2
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作者 N. Minami M. Murase +2 位作者 Y. Utanohara I. Kinoshita A. Tomiyama 《Journal of Energy and Power Engineering》 2011年第6期495-503,共9页
To clarify the countercurrent flow in a PWR hot leg under reflux condensation, numerical simulations of countercurrent air-water flow for a 1/15th scale model of the PWR hot leg were conducted using the two-fluid mode... To clarify the countercurrent flow in a PWR hot leg under reflux condensation, numerical simulations of countercurrent air-water flow for a 1/15th scale model of the PWR hot leg were conducted using the two-fluid model implemented in CFD software. In this paper, the effect of expansion of the inclined pipe, which is the actual plant geometry, was evaluated. When increasing the air velocity, CCFL characteristics and the mechanism of flow pattern transition had significant differences between the case with and without expansion of the inclined pipe. CCFL characteristics were mitigated in the case with expansion. The effect of computational grid size was also discussed. When the supplied water velocity was small, the predicted flow pattern transition point agreed well with the measured data by increasing the number of cells. On the other hand, when the air velocity was decreasing, there were no significant differences in each case. 展开更多
关键词 Mid-loop operation reflux condensation countercurrent flow hot leg numerical simulation.
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Modified Projective Synchronization of a New Hyperchaotic System via Nonlinear Control 被引量:1
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作者 LI Xin 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第8期274-278,共5页
In this paper, a nonlinear control scheme of two identical hyperchaotic Chert systems is developed to realize their modified projective synchronization. We achieve modified projective synchronization between the two i... In this paper, a nonlinear control scheme of two identical hyperchaotic Chert systems is developed to realize their modified projective synchronization. We achieve modified projective synchronization between the two identical hyperchaotic systems by directing the scaling factor onto the desired value. With symbolic computation system Maple and Lyapunov stability theory, numerical simulations are given to perform the process of the synchronization. 展开更多
关键词 modified projective synchronization nonlinear control method hyperchaotic Chen system
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济源奉仙观三清殿大木作营造模数制度研究
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作者 张高岭 《文物建筑》 2017年第1期81-96,共16页
通过对济源奉仙观三清殿的实物勘测和文献调查,在掌握了该建筑木构架构造和构件的具体尺寸及修建历史的基础上,试想推论出该建筑大木作营造的模数制度,研究发现该建筑使用的营造尺1尺等于31厘米,营造的基本尺度模数为0.5尺,基本比例模数... 通过对济源奉仙观三清殿的实物勘测和文献调查,在掌握了该建筑木构架构造和构件的具体尺寸及修建历史的基础上,试想推论出该建筑大木作营造的模数制度,研究发现该建筑使用的营造尺1尺等于31厘米,营造的基本尺度模数为0.5尺,基本比例模数为5份,建筑平面、柱、铺作、举屋、折屋、出际、檐出等的营造制度,基本是沿用宋制,其间广、椽平长、柱高、构件长、出际长、檐出、飞子出等构架、构件尺度控制用三等材,构件断面尺度控制采用四等材,并且后檐在用材、铺作程级及檐出等方面低于前檐一个位阶。 展开更多
关键词 济源奉仙观三清殿 营造尺 用材 营造模数 尺度模数 比例模数
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OPTIMAL PROPORTIONAL REINSURANCE UNDER DEPENDENT RISKS 被引量:2
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作者 Fengqing HU Kam C YUEN 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2012年第6期1171-1184,共14页
This paper considers a correlated risk model with thinning-dependence structure. The au- thors investigate the optimal proportional reinsurance that maximizes the adjustment coefficient and the optimal proportional re... This paper considers a correlated risk model with thinning-dependence structure. The au- thors investigate the optimal proportional reinsurance that maximizes the adjustment coefficient and the optimal proportional reinsurance under mean variance principle for the proposed model. The au- thors derive the optimal solutions and the numerical illustrations to show the impact of the dependence among the classes of business on the optimal reinsurance arrangements. 展开更多
关键词 Adjustment coefficient mean-variance principle optimal proportional reinsurance thinning-dependence structure.
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OPTIMAL INVESTMENT AND PROPORTIONAL REINSURANCE IN THE SPARRE ANDERSEN MODEL 被引量:1
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作者 Zhibin LIANG Junyi GUO 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2012年第5期926-941,共16页
From the insurer's point of view, this paper studies the optimal investment and proportional reinsurance in the Sparre Andersen model. Under the criterion of maximizing the adjustment coefficient, the authors obtain ... From the insurer's point of view, this paper studies the optimal investment and proportional reinsurance in the Sparre Andersen model. Under the criterion of maximizing the adjustment coefficient, the authors obtain the closed form expressions of the optimal strategy and the maximal adjustment coefficient, and derive the explicit expression of the ruin probability or its lower bound when the claim sizes are exponentially distributed. Some numerical examples are presented, which show the impact of model parameters on the optimal values. It can also be seen that the optimal strategy to maximize the adjustment coefficient is sometimes equivalent to those which minimize the ruin probability. 展开更多
关键词 Adjustment coefficient INVESTMENT proportional reinsurance ruin probability SparreAndersen model.
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Joint modeling of longitudinal proportional measurements and survival time with a cure fraction
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作者 SONG Hui PENG YingWei TU DongSheng 《Science China Mathematics》 SCIE CSCD 2016年第12期2427-2442,共16页
In cancer clinical trials and other medical studies, both longitudinal measurements and data on a time to an event(survival time) are often collected from the same patients. Joint analyses of these data would improve ... In cancer clinical trials and other medical studies, both longitudinal measurements and data on a time to an event(survival time) are often collected from the same patients. Joint analyses of these data would improve the efficiency of the statistical inferences. We propose a new joint model for the longitudinal proportional measurements which are restricted in a finite interval and survival times with a potential cure fraction. A penalized joint likelihood is derived based on the Laplace approximation and a semiparametric procedure based on this likelihood is developed to estimate the parameters in the joint model. A simulation study is performed to evaluate the statistical properties of the proposed procedures. The proposed model is applied to data from a clinical trial on early breast cancer. 展开更多
关键词 cure fraction joint model Laplace approximation proportional data simplex distribution survival times
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Dark Energy Models and Cosmic Acceleration with Anisotropic Universe in f(T) Gravity
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作者 M.Sharif Sehrish Azeem 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第4期482-490,共9页
This paper is devoted to studing the accelerated expansion of the universe in context of f(T) theory of gravity. For this purpose, we construct different f(T) models and investigate their cosmological behavior thr... This paper is devoted to studing the accelerated expansion of the universe in context of f(T) theory of gravity. For this purpose, we construct different f(T) models and investigate their cosmological behavior through equation of state parameter by using holographic, new agegraphic and their power-law entropy corrected dark energy models. We discuss the graphical behavior of this parameter versus redshif~ for particular values of constant parameters in Bianchi type I universe model. It is shown that the universe lies in different forms of dark energy, namely quintessence, phantom, and quintom corresponding to the chosen scale factors, which depend upon the constant parameters of the models. 展开更多
关键词 f(T) gravity equation of state dark energy models
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