黄吉平
博士 教授 博士生导师
复旦大学 物理学系
变换热学及其扩展理论、热超构材料及其工程应用:主要发展各种用于控制或调节热输运的理论、模拟和实验方法,设计并实现热隐身、热幻像、宏观热二极管、环境温差中零能耗保温等新奇热现象或功能器件,并推进其在工程领域的直接应用。
个性化签名
- 姓名:黄吉平
- 目前身份:在职研究人员
- 担任导师情况:博士生导师
- 学位:博士
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学术头衔:
博士生导师
- 职称:高级-教授
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学科领域:
热学
- 研究兴趣:变换热学及其扩展理论、热超构材料及其工程应用:主要发展各种用于控制或调节热输运的理论、模拟和实验方法,设计并实现热隐身、热幻像、宏观热二极管、环境温差中零能耗保温等新奇热现象或功能器件,并推进其在工程领域的直接应用。
黄吉平,复旦大学教授、博导。
主要经历:
2003 香港中文大学物理系博士
2003.9-2004.8 德国马普学会高分子研究所博士后
2004.9-2005.8 德国马普学会高分子研究所洪堡学者
2005.9-至今 复旦大学物理系研究员(2005.9-2007.2)、教授
2009.6-2009.12 美国哈佛大学物理系访问学者
2017 获得国家杰出青年科学基金
教学与研究领域:
研究领域:理论热学
研究方向:变换热学及其扩展理论、热超构材料及其工程应用:主要发展各种用于控制或调节热输运的理论、模拟和实验方法,设计并实现热隐身、热幻像、宏观热二极管、环境温差中零能耗保温等新奇热现象或功能器件,并推进其在工程领域的直接应用。
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主页访问
52
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关注数
0
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成果阅读
626
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成果数
8
Phys. Rev. Lett. ,2016,117(5):055501
2016年07月29日
It is crucial to maintain constant temperatures in an energy-efficient way. Here we establish a temperature-trapping theory for asymmetric phase-transition materials with thermally responsive thermal conductivities. Then we theoretically introduce and experimentally demonstrate a concept of an energy-free thermostat within ambient temperature gradients. The thermostat is capable of self-maintaining a desired constant temperature without the need of consuming energy even though the environmental temperature gradient varies in a large range. As a model application of the concept, we design and show a different type of thermal cloak that has a constant temperature inside its central region in spite of the changing ambient temperature gradient, which is in sharp contrast to all the existing thermal cloaks. This work has relevance to energy-saving heat preservation, and it provides guidance both for manipulating heat flow without energy consumption and for designing new metamaterials with temperature-responsive or field-responsive parameters in many disciplines such as thermotics, optics, electromagnetics, acoustics, mechanics, electrics, and magnetism.
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Phys. Rev. Lett.,2015,115(19):195503
2015年11月05日
The macroscopic control of ubiquitous heat flow remains poorly explored due to the lack of a fundamental theoretical method. Here, by establishing temperature-dependent transformation thermotics for treating materials whose conductivity depends on temperature, we show analytical and simulation evidence for switchable thermal cloaking and a macroscopic thermal diode based on the cloaking. The latter allows heat flow in one direction but prohibits the flow in the opposite direction, which is also confirmed by our experiments. Our results suggest that the temperature-dependent transformation thermotics could be a fundamental theoretical method for achieving macroscopic heat rectification, and it could provide guidance both for the macroscopic control of heat flow and for the design of the counterparts of switchable thermal cloaks or macroscopic thermal diodes in other fields like seismology, acoustics, electromagnetics, and matter waves.
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【期刊论文】Experimental econophysics: Complexity, self-organization, and emergent properties
Physics Reports,2015,564():1-55
2015年03月05日
Experimental econophysics is concerned with statistical physics of humans in the laboratory, and it is based on controlled human experiments developed by physicists to study some problems related to economics or finance. It relies on controlled human experiments in the laboratory together with agent-based modeling (for computer simulations and/or analytical theory), with an attempt to reveal the general cause–effect relationship between specific conditions and emergent properties of real economic/financial markets (a kind of complex adaptive systems). Here I review the latest progress in the field, namely, stylized facts, herd behavior, contrarian behavior, spontaneous cooperation, partial information, and risk management. Also, I highlight the connections between such progress and other topics of traditional statistical physics. The main theme of the review is to show diverse emergent properties of the laboratory markets, originating from self-organization due to the nonlinear interactions among heterogeneous humans or agents (complexity).
Experimental econophysics Statistical physics of humans in the laboratory Controlled human experiment Agent-based simulation Theoretical analysis Complexity Self-organization Emergent property
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【期刊论文】Coalescence of Pickering Emulsion Droplets Induced by an Electric Field
Phys. Rev. Lett.,2013,110(6):064502
2013年02月05日
Combining high-speed photography with electric current measurement, we investigate the electrocoalescence of Pickering emulsion droplets. Under a high enough electric field, the originally stable droplets coalesce via two distinct approaches: normal coalescence and abnormal coalescence. In the normal coalescence, a liquid bridge grows continuously and merges two droplets together, similar to the classical picture. In the abnormal coalescence, however, the bridge fails to grow indefinitely; instead, it breaks up spontaneously due to the geometric constraint from particle shells. Such connecting-then-breaking cycles repeat multiple times, until a stable connection is established. In depth analysis indicates that the defect size in particle shells determines the exact merging behaviors: when the defect size is larger than a critical size around the particle diameter, normal coalescence will show up, while abnormal coalescence will appear for coatings with smaller defects.
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【期刊论文】Herd behavior in a complex adaptive system
PNAS,2011,108(37):15058-1506
2011年09月13日
In order to survive, self-serving agents in various kinds of complex adaptive systems (CASs) must compete against others for sharing limited resources with biased or unbiased distribution by conducting strategic behaviors. This competition can globally result in the balance of resource allocation. As a result, most of the agents and species can survive well. However, it is a common belief that the formation of a herd in a CAS will cause excess volatility, which can ruin the balance of resource allocation in the CAS. Here this belief is challenged with the results obtained from a modeled resource-allocation system. Based on this system, we designed and conducted a series of computer-aided human experiments including herd behavior. We also performed agent-based simulations and theoretical analyses, in order to confirm the experimental observations and reveal the underlying mechanism. We report that, as long as the ratio of the two resources for allocation is biased enough, the formation of a typically sized herd can help the system to reach the balanced state. This resource ratio also serves as the critical point for a class of phase transition identified herein, which can be used to discover the role change of herd behavior, from a ruinous one to a helpful one. This work is also of value to some fields, ranging from management and social science, to ecology and evolution, and to physics.
experimental econophysicscomputational econophysicsmarket-directed resource-allocation gameminority gameagent-based model
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【期刊论文】Optical Negative Refraction in Ferrofluids with Magnetocontrollability
Phys. Rev. Lett. ,2010,104(3):034501
2010年01月20日
We numerically demonstrate optical negative refraction in ferrofluids containing isotropic Fe3O4 nanoparticles, each having an isotropic Ag shell, in the presence of an external dc magnetic field H. The all-angle broadband optical negative refraction with magnetocontrollability arises from H-induced chains or columns. They result in hyperbolic equifrequency contour for transverse magnetic waves propagating in the system. The finite element simulations verify the analyses using the effective medium approximation. Experimental demonstration and potential applications are suggested and discussed.
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PNAS,2009,106(21):8423-8428
2009年05月26日
There has been a belief that with the directing power of the market, the efficient state of a resource-allocating system can eventually be reached even in a case where the resource is distributed in a biased way. To mimic the realistic huge system for the resource allocation, we designed and conducted a series of economic experiments. From the experiments we found that efficient allocation can be realized despite a lack of communications among the participants or any instructions to them. To explain the underlying mechanism, an extended minority game model called the market-directed resource allocation game (MDRAG) is constructed by introducing heterogeneous preferences into the strategy-building procedures. MDRAG can produce results in good agreement with the experiments. We investigated the influence of agents' decision-making capacity on the system behavior and the phase structure of the MDRAG model as well. A number of phase transitions are identified in the system. In the critical region, we found that the overall system will behave in an efficient, stable, and unpredictable mode in which the market's invisible hand can fully play its role.
biased distributioninvisible handeconomic experimentsminority gameresource allocation
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【期刊论文】Enhanced nonlinear optical responses of materials: Composite effects
Physics Reports,2006,431(3):87-172
2006年08月01日
We review recent theoretical progress in understanding physical processes of composite effects on enhanced third-order nonlinear optical responses of various kinds of the recently-proposed nonlinear optical materials, namely, colloidal nanocrystals with inhomogeneous metallodielectric particles or a graded-index host, metallic films with inhomogeneous microstructures adjusted by ion doping or temperature gradient, composites with compositional gradation or graded particles, and magneto-controlled ferrofluid-based nonlinear optical materials.
Enhanced nonlinear optical responses Composite effects Nonlinear optical materials Graded composite materials
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