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Search Results: 1 - 10 of 26733 matches for " Weiliang Jin "
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A New Corrosion Sensor to Determine the Start and Development of Embedded Rebar Corrosion Process at Coastal Concrete
Chen Xu,Zhiyuan Li,Weiliang Jin
Sensors , 2013, DOI: 10.3390/s131013258
Abstract: The corrosion of reinforcements induced by chloride has resulted to be one of the most frequent causes of their premature damage. Most corrosion sensors were designed to monitor corrosion state in concrete, such as Anode-Ladder-System and Corrowatch System, which are widely used to monitor chloride ingress in marine concrete. However, the monitoring principle of these corrosion sensors is based on the macro-cell test method, so erroneous information may be obtained, especially from concrete under drying or saturated conditions due to concrete resistance taking control in macro-cell corrosion. In this paper, a fast weak polarization method to test corrosion state of reinforcements based on electrochemical polarization dynamics was proposed. Furthermore, a new corrosion sensor for monitoring the corrosion state of concrete cover was developed based on the proposed test method. The sensor was tested in cement mortar, with dry-wet cycle tests to accelerate the chloride ingress rate. The results show that the corrosion sensor can effectively monitor chloride penetration into concrete with little influence of the relative humidity in the concrete. With a reasonable corrosion sensor electrode arrangement, it seems the Ohm-drop effect measured by EIS can be ignored, which makes the tested electrochemical parameters more accurate.
Durability related environmental zonationand design methodology for marine RC structures
Wu Hairong, , Lü Qingfang, Jin Weiliang
- , 2018, DOI: 10.3969/j.issn.1003-7985.2018.01.012
Abstract: A reliability-based quantitative durability design methodology is presented for reinforced concrete(RC)structures in the marine environment on the basis of natural exposure data derived from four berths(1.5, 1.5, 4 and 15 years)of a concrete port. More than 200 chloride profiles are obtained and analyzed. The relationship between nominal surface chloride ion concentration and altitude is discussed. Subsequently, the formula of the apparent chloride diffusion coefficient is proposed with consideration of the surrounding temperature, sodium chloride solution concentration, age factor and altitude. Then, the reliability-based method to predict the durability of RC structures is developed according to Fick’s second law. Relationships between the predicted penetration depth of the chloride ion, the ratio of the wetting time per-period and the corresponding altitude are discussed. Subsequently, the environmental zonation methodology is established for concrete structures under a marine chloride environment by considering the ratio of the wetting time per-period of concrete as the zoning index. Finally, the corres-ponding durability design method for each zone level is established, which contains the durability design regulations of the specimen, and correction coefficients for different water/binder ratios, ages, temperatures and chloride ion concentrations.
Temperature control of thermal radiation from heterogeneous bodies
Weiliang Jin,Athanasios G. Polimeridis,Alejandro W. Rodriguez
Physics , 2015,
Abstract: We demonstrate that recent advances in nanoscale thermal transport and temperature manipulation can be brought to bear on the problem of tailoring thermal radiation from compact emitters. We show that wavelength-scale composite bodies involving complicated arrangements of phase-change chalcogenide (GST) glasses and metals or semiconductors can exhibit large emissivities and partial directivities at mid-infrared wavelengths, a consequence of temperature localization within the GST. We consider multiple object topologies, including spherical, cylindrical, and mushroom-like composites, and show that partial directivity follows from a complicated interplay between particle shape, material dispersion, and temperature localization. Our calculations exploit a recently developed fluctuating-volume current formulation of electromagnetic fluctuations that rigorously captures radiation phenomena in structures with both temperature and dielectric inhomogeneities.
Amplified and directional spontaneous emission from arbitrary composite bodies: self-consistent treatment of Purcell effect below threshold
Weiliang Jin,Chinmay Khandekar,Adi Pick,Athanasios G. Polimeridis,Alejandro W. Rodriguez
Physics , 2015,
Abstract: We study amplified spontaneous emission (ASE) from wavelength-scale composite bodies--complicated arrangements of active and passive media--demonstrating highly directional and tunable radiation patterns, depending strongly on pump conditions, materials, and object shapes. For instance, we show that under large enough gain, $\mathcal{PT}$ symmetric dielectric spheres radiate mostly along either active or passive regions, depending on the gain distribution. Our predictions are based on a recently proposed fluctuating volume--current (FVC) formulation of electromagnetic radiation that can handle inhomogeneities in the dielectric and fluctuation statistics of active media, e.g. arising from the presence of non-uniform pump or material properties, which we exploit to demonstrate an approach to modelling ASE in regimes where Purcell effect (PE) has a significant impact on the gain, leading to spatial dispersion and/or changes in power requirements. The nonlinear feedback of PE on the active medium, captured by the Maxwell--Bloch equations but often ignored in linear formulations of ASE, is introduced into our linear framework by a self-consistent renormalization of the (dressed) gain parameters, requiring the solution of a large system of nonlinear equations involving many linear scattering calculations.
Giant frequency-selective near-field heat transfer in $\mathcal{PT}$-symmetric structures
Chinmay Khandekar,Weiliang Jin,Owen D. Miller,Adi Pick,Alejandro W. Rodriguez
Physics , 2015,
Abstract: We demonstrate the possibility of achieving giant, amplified spontaneous energy transfer (ASET) between active and passive bodies---dimers consisting of ion-doped metallic spheres separated by small gaps. We show that while ASET mediated by wavelength-scale resonances is often comparable or smaller than far-field emission, subwavelength resonances at low frequencies can, under specific circumstances, i.e. special configurations of dimers operating close to or under $\mathcal{PT}$ symmetry, enable enhanced amplified spontaneous emission (ASE) into the passive object rather than into the far field, providing optimal conditions for achieving large heat transfer below lasing. These predictions pave the way for further studies of efficient and optically tunable thermal extraction or cooling of microstructured surfaces.
多步预测的小波神经网络预报模型
金龙 Jin Long,秦伟良 Qin Weiliang,姚华栋 Yao Huadong
大气科学 , 2000, DOI: 10.3878/j.issn.1006-9895.2000.01.08
Abstract: 采用小波分析与人工神经网络相结合的方法,进行了一种新的非线性长期预报模型研究。结果表明,所构造的小波神经网络多步预测模型对历史样本具有很好的拟合效果,独立样本的预报效果也令人满意。并且,该预报模型具有误差收敛快,预报时效长以及建模所需阶数低等显著优点,具有很好的研究前景。
Fluctuating volume-current formulation of electromagnetic fluctuations in inhomogeneous media: incandecence and luminescence in arbitrary geometries
Athanasios G. Polimeridis,M. T. Homer Reid,Weiliang Jin,Steven G. Johnson,Jacob K. White,Alejandro W. Rodriguezz
Physics , 2015, DOI: 10.1103/PhysRevB.92.134202
Abstract: We describe a fluctuating volume--current formulation of electromagnetic fluctuations that extends our recent work on heat exchange and Casimir interactions between arbitrarily shaped homogeneous bodies [Phys. Rev. B. 88, 054305] to situations involving incandescence and luminescence problems, including thermal radiation, heat transfer, Casimir forces, spontaneous emission, fluorescence, and Raman scattering, in inhomogeneous media. Unlike previous scattering formulations based on field and/or surface unknowns, our work exploits powerful techniques from the volume--integral equation (VIE) method, in which electromagnetic scattering is described in terms of volumetric, current unknowns throughout the bodies. The resulting trace formulas (boxed equations) involve products of well-studied VIE matrices and describe power and momentum transfer between objects with spatially varying material properties and fluctuation characteristics. We demonstrate that thanks to the low-rank properties of the associatedmatrices, these formulas are susceptible to fast-trace computations based on iterative methods, making practical calculations tractable. We apply our techniques to study thermal radiation, heat transfer, and fluorescence in complicated geometries, checking our method against established techniques best suited for homogeneous bodies as well as applying it to obtain predictions of radiation from complex bodies with spatially varying permittivities and/or temperature profiles.
Implementation of Respecting and Safeguarding Human Rights Provisions at the Criminal Justice
Jing WANG,Weiliang YAO
Cross-Cultural Communication , 2012, DOI: 10.3968/j.ccc.1923670020120806.2353
Abstract: The amended “Code of Criminal Procedure” in 2012 has written “respecting and safeguarding human rights” into the Article 2 of this provision. This is a tremendous progress in our criminal justice. Essentially, the fundamental purpose of criminal justice system is to safeguard citizens, especially the human rights of criminal suspects and criminal defendants. Currently, although the criminal justice system in China has made significantly progress in the protection of human rights in recent years, there are still many problems. By the occasion of the amendment to the “Code of Criminal Procedure”, it should further improve human rights protection mechanisms of criminal justice in China and raise the legalization level of criminal justice in China. Key words: Human rights protection; Criminal justice; Code of criminal procedure
The Financial Accounting Reform in the New Social Economic Environment
Mingguang Huang,Weiliang Song
International Journal of Business and Management , 2009,
Abstract: Along with WTO accession, China has gradually entered the world economy, there are greater changes inevitably in the social economic environment of China, and the change of the social economic environment will directly influence the development of the theory and practice of the accounting. This article made the analysis of which both the development of the change of the social economic environment and the influence of the financial accounting, then emphasized three ways from which the improvement of the accounting legal system, the specification of the financial report and the intensification of the accounting information processing, to discuss the directions of the financial accounting reform.
A Strategic Study on Foreign Fund Utilization in Chinese Insurance Industry
Yingna Wu,Weiliang Song
International Journal of Business and Management , 2009,
Abstract: The World Investment Report 2004 issued by the Union Nation Conference on Trade and Development (UNCTAD) indicates the service industry has been the mainstream of the world direct investment. In such context, China’s opening in the insurance industry will attract a large amount of foreign fund, which involves both developing opportunities and severe challenges. In order to lighten the impact of foreign funds, we have to adopt relevant measures. For example, we can create a favorable developing environment for national insurance industry by regulating the insurance law system and supervising system. We can cultivate a mature insurance market by innovation. We can increase the insurance investment and financing to speed up the company listing procedure. And we can explore the human resources and adopt a talent strategy.
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