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Controlled Probabilistic Teleportation of an Unknown Multi-Particle High-Dimensional Entangled State

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Communications in Theoretical Physics 2009年第6期51卷 1027-1032页

作者： shi Jin ZHAN you-Bang Department of Physics Huaiyin Teachers College Huaian 223300 China

We propose a protocol for controlled probabilistic teleportation of an unknown tripartite qutrit entangled state with two partial tripartite qutrit entangled states as the quantum channel. It is found that teleportation associated with the generalized qutrit Bell-basis measurement, the generalized qutrit π-state measurement and the generalized Hadamard operator in three-dimensional Hilbert space. We generalize the protocol for controlled probabilistic teleportation of an unknown k-particle qudit entangled state with a multi-particle qudit entangled state and a tripartite qudit entangled state as the quantum channel. We also calculate the classical communication cost required in both cases.

关键词： probabilistic teleportation generalized Bell-basis measurement Hadamard operator unitary transformation classical communication cost

Probabilistic Remote Preparation of a Tripartite High-Dimensional Equatorial Entangled State

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Communications in Theoretical Physics 2009年第2期51卷 239-243页

作者： shi Jin ZHAN you-Bang Department of Physics Huaiyin Teachers College Huai＇an 223001 China

We present a scheme for probabilistic remote preparation of a tripartite qutrit entangled state with a partial tripartite qutrit entangled state and a partial bipartite qutrit entangled state as the quantum channel. It is found that a bipartite qutrit orthogonal projective measurement, an auxiliary qutrit particle, and the corresponding unitary transformation are required. A scheme for probabilistic remote preparation of a tripartite qudit equatorial entangled state by using a partial tripartite qudit entangled state and a partial bipartite qudit entangled state as the quantum channel is also proposed. We calculate the successful total probability and the total classical communication cost required in the RSP process, respectively.

关键词： remote state preparation equatorial entangled state classical communication cost projective measurement unitary transformation

Controllability and stability of primary frequency control from thermostatic loads with delays

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Journal of Modern Power Systems and Clean Energy 2017年第1期5卷 43-54页

作者： Charalampos ZIRAS Evangelos VRETTOS shi you Center for Electric Power and Energy DTULyngbyDenmark Power Systems Laboratory ETH ZurichZurichSwitzerland

There is an increasing interest in exploiting theflexibility of loads to provide ancillary services to the *** this paper we study how response delays and lockout constraints affect the controllability of an aggregation of refrigerators offering primary frequency control(PFC).First we examine the effect of delays in PFC provision from an aggregation of refrigerators, using a two-area power system. We propose a framework to systematically address frequency measurement and response delays and we determine safe values for the total delays via simulations. We introduce a controllability index to evaluate PFC provision under lockout constraints of refrigerators compressors. We conduct extensive simulations to study the effects of measurement delay, ramping times, lockout durations and rotational inertia on the controllability of the aggregation and system stability. Finally, we discuss solutions for offering reliable PFC provision from thermostatically controlled loads under lockout constraints and we propose a supervisory control to enhance the robustness of their controllers.

关键词： Primary frequency control Stability Controllability Delay Thermostatically controlled loads

New analytical solution for the analysis and design of permanent magnet thrust bearings

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1199-1204页

作者： Huan YANG Rong-xiang ZHAO shi-you YANG School of Electrical Engineering Zhejiang University Hangzhou 310027 China

On the basis of the current sheet model, a new analytical solution for permanent magnet （PM） bearings is developed. Compared with analytical methods based on the coupling energy model and the magnetic dipole model, the proposed one is more physically intuitive and convenient for engineering designers. According to the analytical model, the thrust characteristics of a novel PM thrust bearing is studied and verified by finite element analysis （FEA）. In the proposed thrust bearing configuration, the rotor is composed of stacked PM tings with alternative axial magnetization directions, and the stator with alternative radial magnetization directions while copper rings are used to separate adjacent PM rings. A prototype PM thrust bearing with the proposed configuration is designed and fabricated. The performances of the PM thrust beating are experimentally validated. It is shown that the calculation accuracy of the presented analytical solution is satisfying.

关键词： Permanent magnet (PM) Current sheet model Thrust bearing Vibration

Shear flow induced vibrations of long slender cylinders with a wake oscillator model

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Acta Mechanica Sinica 2011年第3期27卷 330-338页

作者： Fei Ge Wei Lu Lei Wang you-shi Hong State Key Laboratory of Nonlinear Mechanics Institute of Mechanics CAS 100190 Beijing China

A time domain model is presented to study the vibrations of long slender cylinders placed in shear flow. Long slender cylinders such as risers and tension legs are widely used in the field of ocean engineering. They are subjected to vortex-induced vibrations（VIV） when placed within a transverse incident flow. A three dimensional model coupled with wake oscillators is formulated to describe the response of the slender cylinder in cross-flow and in-line directions. The wake oscillators are distributed along the cylinder and the vortex-shedding frequency is derived from the local current velocity. A non-linear fiuid force model is accounted for the coupled effect between cross-flow and in-line vibrations. The comparisons with the published experimental data show that the dynamic features of VIV of long slender cylinder placed in shear flow can be obtained by the proposed model,such as the spanwise average displacement,vibration frequency,dominant mode and the combination of standing and traveling waves. The simulation in a uniform flow is also conducted and the result is compared with the case of nonuniform flow. It is concluded that the flow shear characteristic has significantly changed the cylinder vibration behavior.

关键词： Vortex-induced vibration Vortex-induced wave Shear flow Wake oscillator Long slender cylinder

Axisymmetric compressive buckling of multi-walled carbon nanotubes under different boundary conditions

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Acta Mechanica Sinica 2012年第1期28卷 83-90页

作者： Cheng-Qi Sun Kai-Xin Liu you-shi Hong The State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of Sciences100190 BeijingChina LTCS and Department of Mechanics&Aerospace Engineering College of EngineeringPeking University100871 BeijingChina

The paper studies the axisymmetric compressive buckling behavior of multi-walled carbon nanotubes （MWNTs） under different boundary conditions based on continuum mechanics model. A buckling condition is derived for determining the critical buckling load and associated buckling mode of MWNTs, and numerical results are worked out for MWNTs with different aspect ratios under fixed and simply supported boundary conditions. It is shown that the critical buckling load of MWNTs is insensitive to boundary conditions, except for nanotubes with smaller radii and very small aspect ratio. The associated buckling modes for different layers of MWNTs are in-phase, and the buckling displacement ratios for different layers are independent of the boundary conditions and the length of MWNTs. Moreover, for simply supported boundary conditions, the critical buckling load is compared with the corresponding one for axial compressive buckling, which indicates that the critical buckling load for axial compressive buckling can be well approximated by the corresponding one for axisymmetric compressive buckling. In particular, for axial compressive buckling of double-walled carbon nanotubes, an analytical expression is given for approximating the critical bucklingload. The present investigation may be of some help in fur- ther understanding the mechanical properties of MWNTs.

关键词： Carbon nanotube Buckling van der Waals forces

Exploring Potential of Energy Flexibility in Buildings for Energy System Services

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CSEE Journal of Power and Energy Systems 2018年第4期4卷 434-443页

作者： Rongling Li shi you Department of Civil Engineering Technical University of DenmarkBrovejBuilding 1182800 Kgs.LyngbyDenmark Center for Electric Power and Energy Technical University of DenmarkElektrovej 325DK 2800Denmark

Buildings have both high as well as flexible energy demands and play an important role in the energy internet *** buildings’energy flexibility(BEF)is a widely recognized concept;however,how to unlock its potential is a relatively new research *** this paper,the authors provide an overview of the latest research related to *** introduction to BEF is provided,methods developed for identifying and characterizing BEF are presented,and several key influencing factors are *** overview also covers various aggregation methods to scale up BEF impacts and service-oriented solutions for enabling BEF applications in different energy *** work lays the groundwork for designing and developing seamless integration strategies for BEF use in both present and future energy systems.

关键词： Aggregation buildings’energy flexibility(BEF) energy internet seamless integration service-oriented framework

Incorporating Optimal Operation Strategies into Investment Planning for Wind/Electrolyser System

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CSEE Journal of Power and Energy Systems 2022年第2期8卷 347-359页

作者： Yi Zheng shi you Henrik W.Bindner Marie Munster the Department of Electrical Engineering Technical University of Denmark2800 Kgs.LyngbyDenmark the Department of Technology Management and EconomicsTechnical University of Denmark2800 Kgs.LyngbyDenmark

As a conducive and prevalent technique for producing green hydrogen,hybrid wind-based electrolyzer system requires both effective planning and operation to realize its techno-economic *** of the existing studies are focused on either of these two,but none of them sufficiently emphasize on their *** this paper,we propose a two-stage multi-objective optimization framework to reveal optimal investment plans considering various operational strategies,such as economic revenue maximization and green hydrogen production *** results reveal that:1)A trade-off exists between system investment and the capacity to accomplish optimal operational *** example,the system demands flexibility to boost operational profits,but this results in high investment costs.2)Differentiated operation objectives generate different component capacities during the planning phase.3)Regarding a wind-hydrogen system with gas storage,the Pareto optimal design manifesting the trade-off between system investment and prime operational performance can be actualized along the margins of a feasible solution.

关键词： Hybrid wind-hydrogen system multi-objective optimization optimal operation planning sizing

Value assessment of hydrogen-based electrical energy storage in view of electricity spot market

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Journal of Modern Power Systems and Clean Energy 2016年第4期4卷 626-635页

作者： shi you Junjie HU Yi ZONG Jin LIN Department of Electrical Engineering Technical University of DenmarkElektrovej 3252800 Kongens LyngbyDenmark Department of Electrical Engineering Tsinghua UniversityHaidian DistrictBeijing 100084China

Hydrogen as an energy carrier represents one of the most promising carbon-free energy *** ongoing development of power-to-gas(Pt G)technologies that supports large-scale utilization of hydrogen is therefore expected to support hydrogen economy with a final *** this paper,the economic performance of a MW-sized hydrogen system,i.e.a composition of water electrolysis,hydrogen storage,and fuel cell combined heat and power plant(FCCHP),is assessed as an example of hydrogen-based bidirectional electrical energy storage(EES).The analysis is conducted in view of the Danish electricity spot market that has high price volatility due to its high share of wind *** economic dispatch model is developed as a mixed-integer programming(MIP)problem to support the estimation of variable cost of such a system taking into account a good granularity of the technical *** on a projected technology improvement by 2020,sensitivity analysis is conducted to illustrate how much the hydrogen-based EES is sensitive to variations of the hydrogen price and the capacity of hydrogen storage.

关键词： Electrical energy storage(EES) Electricity spot market Fuel cell combined heat and power plant(FCCHP) Hydrogen Hydrogen storage Mixed-integer programming(MIP)