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河北学刊 2025年第1期45卷 11-19页

作者：沈顺福山东大学易学与中国古代哲学研究中心暨儒学高等研究院

体认是宋明理学的重要概念之一,主要是指由心灵自身所发动的、面对自身的活动。这种对自身的心灵活动便是现代哲学的反思。体认既是对天理的体合、实现心理合一,也是让本性澄明。理学家认为,自然的浊气遮蔽了天生的本性,而体认便是心灵... 详细信息

体认是宋明理学的重要概念之一,主要是指由心灵自身所发动的、面对自身的活动。这种对自身的心灵活动便是现代哲学的反思。体认既是对天理的体合、实现心理合一,也是让本性澄明。理学家认为,自然的浊气遮蔽了天生的本性,而体认便是心灵对气质浑浊的心灵的活动,通过纯洁气质,让性澄明。心理合一也是本性澄明——理即性;对本性的觉察也是对自身身份的觉悟,形成主体——性即体。对性的认可便是对理的接受与遵循;体认天理的活动便是合“理”的超越性活动。

关键词：体认反思理理学

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海藻硒多糖茶叶开发研制与效应

中国茶叶加工 2005年第3期 35-35,32页

作者：周理飞傅远顺福建省建瓯市农技中心建瓯353100 福建省建瓯市远顺健身茶研究所建瓯353100

海藻硒是人体需求的重要微量元素之一,为提高人们健康,增强免疫力,大力开发生产有益人体健康饮用产品势在必行。目前我市已成功开发出海藻硒多糖茶叶产品,并批量生产试销初显成效。本文就开发海藻硒多糖茶叶的目的意义、研制工艺与市场... 详细信息

海藻硒是人体需求的重要微量元素之一,为提高人们健康,增强免疫力,大力开发生产有益人体健康饮用产品势在必行。目前我市已成功开发出海藻硒多糖茶叶产品,并批量生产试销初显成效。本文就开发海藻硒多糖茶叶的目的意义、研制工艺与市场效应方面进行试述,提出今后开发前景与展望。

关键词：海藻硒茶叶研制工艺市场效应前景展望茶叶开发硒多糖海藻人体健康增强免疫力微量元素

Tidal Bore Dynamics Around the Similar Right-Angle Shoreline in the Qiantang Estuary,China

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China Ocean Engineering 2022年第5期36卷 827-838页

作者： WANG Qiu-shun PAN Cun-hong CHEN fu-yuan Zhejiang Institute of Hydraulics and Estuary Hangzhou 310020China Zhejiang Provincial Key Laboratory of Estuary and Coast Hangzhou 310020China

Tidal bores are a unique hydrodynamic phenomenon during flood tide in the Qiantang *** tidal bore propagation around the similar right-angle shoreline is rarely documented in tidal *** investigate tidal bores around this shoreline,a hydrodynamic model combined with a theoretical method is employed to reveal the characteristics of the bore *** theoretical solution of the tidal bore intensity is deduced to illustrate the relationship of the incident tidal bores and the back-flow bores during the *** hydrodynamic model based on shallow water equation is employed to perform the simulation of tidal bores in the *** results with respect to the bore height and the propagation speed of tidal bores have a favourable agreement with field *** tidal bore dynamics in the neighborhood of the similar right-angle shoreline are *** characteristics of tidal bores in terms of water surface,velocity,bore steepness and the intensity are illustrated and the back-flow bore is analyzed by numerical and theoretical methods around the similar right-angle *** height of the back-flow bore relative to the incident tidal bore ranges from 1.05 to *** result reveals that the ambient water depth and the shape of the similar right-angle shoreline are contributed to the back-flow bore formation.

关键词： back-flow bore numerical model shallow water equation Qiantang Estuary tidal bores

Non-saturated throughput analysis of IEEE 802.11-based cognitive radio networks

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The Journal of China Universities of Posts and Telecommunications 2012年第6期19卷 6-13页

作者： ZHAO yuan JIN shun-fu TIAN Nai-shuo College of Information Science and Engineering Yanshan University College of Science Yanshan University

Technology of cognitive radio networks has emerged as an effective method to enhance the utilization of the radio spectrum where the primary users have priority to use the spectrum, and the secondary users try to exploit the spectrum unoccupied by the primary users. In this paper, considering the non-saturated condition, the performance analysis for the IEEE 802.11-based cognitive radio networks is presented with single-channel and multi-channel, respectively. For the single-channel case, an absorbing Markov chain model describing the system transitions is constructed, and one-step transition probability matrix of the Markov chain is given. By using the method of probability generating function, the non-saturated throughput of the secondary users is obtained. For the multi-channel case, taking into account the negotiation-based sensing policy, the mean number of unused channels perceived by the second users is given, and then the non-saturated aggregate throughput of the secondary users is derived. Finally, numerical examples are provided to show the influences of the non-saturated degree, the number of the secondary users and the channel utilization of the primary users on the performance measures for the non-saturated throughput with single-channel and the non-saturated aggregate throughput with multi-channel.

关键词： cognitive radio networks IEEE 802.11 non-saturated throughput absorbing Markov chain probability generating function

Tracking Performance Under Additive Gaussian Noise and Control Energy Constraint for Networked Control Systems

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Tracking Performance Under Additive Gaussian Noise and Contr...

第24届中国控制与决策会议

作者： Ming Chi 1 , Zhi-Hong Guan 1 , Li Ding 2 , fu-shun yuan 3 1. Department of Control Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China2. School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China 3. School of Mathematics and Statistics, Anyang Normal University, Anyang, 455002, China

There is an increasing interest in studying the optimal tracking performance of network control systems. This paper investigates the optimal tracking performance issues of finite-dimensional, continuous-time, linear time-invariant network control systems, in which the forward path is subject to noise disturbance and an additive white Gaussian Noise existed in the output feedback. The reference input is a Brownian motion random process. The two-parameter controller is employed and an integral square criterion is adopted to measure the tracking error and the input energy. The plant under consideration is assumed to be non-minimum phase and unstable, that is, the plant has zeros in the right half and unstable poles. The explicit expression of the tracking performance has been obtained. The results show that the white Gaussian noise, as well as the unstable poles and non-minimum phase zeros, can worsen the tracking performance.

关键词： Tracking performance white Gaussian noise control energy constraint two-parameter control unstable poles non-minimum phase zeros.

来源： cnki会议评论

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硅酸盐水泥熟料中方镁石允许含量的探讨

硅酸盐学报 1964年第3期 180-192页

作者：童三多赵福欣袁振锜建筑工程部建筑材料科学研究院

本文提出了在硅酸盐水泥熟料中规定方镁石最大允许含量以控制质量的可能性。探讨了影响方镁石最大允许含量的主要因素。试验表明,方镁石最大允许含量随方镁石粒度、水泥比面积和熟料中游离氧化钙而变化。在熟科中游离氧化钙较低时,水泥... 详细信息

本文提出了在硅酸盐水泥熟料中规定方镁石最大允许含量以控制质量的可能性。探讨了影响方镁石最大允许含量的主要因素。试验表明,方镁石最大允许含量随方镁石粒度、水泥比面积和熟料中游离氧化钙而变化。在熟科中游离氧化钙较低时,水泥比面积固定的情况下,方镁石最大允许含量与方镁石粒度之间存在着双曲线类型的函数关系。

关键词：游离氧化镁水泥膨胀率方镁石镁矿物熟料游离氧化钙

Transformation behaviors and superelasticity of Ti_(50)Ni_(48)Fe_2 shape memory alloy subjected to cold-rolling and subsequent annealing

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Rare Metals 2014年第6期33卷 652-656页

作者： Xiao-Bo yuan Bin Chen fu-shun Liu Qing Xu Wen Ma School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Capital Aerospace Machinery Company Division of Science & Technology Information General Research Institute for Nonferrous Metals

The effects of annealing on the phase transformation behavior and superelasticity of cold-rolled Ti50Ni48Fe2 shape memory alloy were extensively investigated. Curves of temperature dependence of electrical resistivity reveal that both the cold-rolled and annealed specimens exhibit a B2→R→B19’two-stage martensitic transformation upon cooling and a B19’→B2 one-stage transformation upon heating, although the austenitic transformation temperature decreases with the increase of the annealing temperature. Tensile stress–strain curves show the critical stress for stress-induced martensite（rSIM）of Ti50Ni48Fe2 alloys decreases with the increase of annealing temperature due to the decrement of dislocation density caused by the recrystallization. As a result, the rSIM decreases. Upon a cold-rolling and annealing at 623 K for30 min, the Ti50Ni48Fe2 alloy exhibits excellent superelasticity with the maximum recoverable strain of 5.8 % at a loading strain of 7 %. In such a case, a complete superelasticity of 5 % can be obtained in the Ti50Ni48Fe2 alloy after deformation increasing to 15 cycles.

关键词： Shape memory alloys Cold-rolling Annealing Superelasticity

Modeling of drag reduction in turbulent channel flow with hydrophobic walls by FVM method and weakly-compressible flow equations

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Acta Mechanica Sinica 2011年第2期27卷 200-207页

作者： Ling Li Ming-shun yuan State Key Laboratory of Hydroscience and Engineering Tsinghua University 100084 Beijing China

In this paper the effects of hydrophobic wall on skin-friction drag in the channel flow are investigated through large eddy simulation on the basis of weaklycompressible flow equations with the MacCormack’s scheme on collocated mesh in the FVM framework. The slip length model is adopted to describe the behavior of the slip velocities in the streamwise and spanwise directions at the interface between the hydrophobic wall and turbulent channel flow. Simulation results are presented by analyzing flow behaviors over hydrophobic wall with the Smagorinky subgrid-scale model and a dynamic model on computational meshes of different resolutions. Comparison and analysis are made on the distributions of timeaveraged velocity, velocity fluctuations, Reynolds stress as well as the skin-friction drag. Excellent agreement between the present study and previous results demonstrates the accuracy of the simple classical second-order scheme in representing turbulent vertox near hydrophobic wall. In addition, the relation of drag reduction efficiency versus time-averaged slip velocity is established. It is also foundthat the decrease of velocity gradient in the close wall region is responsible for the drag reduction. Considering its advantages of high calculation precision and efficiency, the present method has good prospect in its application to practical projects.

关键词： Wall turbulences · Large eddy simulation · Drag reduction · Hydrophobic wall · Weakly compressible flow

Phase transformation behavior and mechanical properties of Ti_(50)Ni_(49-x) Fe_1Co_x shape memory alloys

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Rare Metals 2013年第3期32卷 225-227页

作者： Bin Chen fu-shun Liu School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics

In this article, the influence of Co addition on phase transformation behavior and mechanical properties of TiNiFe shape memory alloy was investigated extensively. Differential scanning calorimetry （DSC） measurements shows that martensitic start transformation temperatures （Ms） decrease drastically with increasing Co content, while the R phase transformation start temperatures （Rs） vary slightly. Nevertheless, the substitution of Ni with Co does not exert substantial influence on the two-stage transformation behavior of the TiNiFe alloy. The results from stress-strain curves indicate that higher critical stress for stress-induced martensitic transformation （σSIM） has been obtained because of Co addition. In such cases, the Ti50Ni48sFelCO1.0 alloy maintains a good shape memory effect, and a maximum recoverable strain of 7.5 % can be obtained.

关键词： Ms σSIM Shape memory effect