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Search Results: 1 - 10 of 47405 matches for " Yun Zhou "
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Behind the Muslim Veil: A Qualitative Analysis of Pakistani Female Students' Views towards Veiling
Yun Zhou
Cross-Cultural Communication , 2010, DOI: 10.3968/789
Abstract: The research is conducted after a ten-month stay in Islamabad, Pakistan. It intends to qualitatively demonstrate the veiled women’s own opinions towards issues regarding veiling and women’s rights in Islamic society. It also presents the functions of veils from a point of view of multiculturalism. Key words: Veil; Islam Feminism; Women’s Rights; Multiculturalism Résumé: Cette recherche est menée après un séjour de dix mois à Islamabad, au Pakistan. Il tente de démontrer qualitativement les propres opinions des femmes voilées à l'égard de questions liées au voile et aux droits de femmes dans la société islamique. Il présente également les fonctions de voile d'un point de vue du multiculturalisme. Mots-Clés: voile islamique; féminisme; droits de femme; multiculturalisme
Research on the Optimized Network Configuration of DC Blocking Device  [PDF]
Chengjun Xia, Yinggeng Xie, Yun Zhou
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.29021
Abstract:

HVDC transmission system has considerable impact on the surrounding power transformers when the system is running in the unipolar ground mode, which will cause the DC magnetic biasing phenomenon on transformers. This problem would be more serious, after commission and operation of UHVDC transmission system in China. According to the Guangdong power grid under the influence of DC magnetic bias seriously, but little research about the using of blocking device, this paper proposed an optimization scheme about the usage of blocking device combination. Firstly, the subject studied the method of suppressing transformer neutral point DC depending on analysis the mechanism of magnetic biasing, and then found out the changes of power grid after using the capacitance blocking device which is popular used by Guangdong power grid. The particle swarm optimization (PSO) has been used to find a better way to suppress the DC in power grid, and combined with NSGA to solve the mixed integer programming problem. The final data validation of this method is valuable in engineering application.

Technology Roadmap of IGCC Industry in China  [PDF]
Yun Guo, Zhiqiang Huang, Zhiguan Zhou
Energy and Power Engineering (EPE) , 2015, DOI: 10.4236/epe.2015.711050
Abstract: With the increasing energy demand and environmental pressures caused by consumption of fossil fuels, the world casts their eyes on new energy, hoping to transform the existing energy structure through technological innovation to new energy field, to promote the optimization and upgrading of the world’s energy structure. The new energy in key areas of Chinese high-tech industries includes mainly nuclear power, wind power, solar power, IGCC (Integrated Gasification Combined Cycle), new energy vehicles and smart grids. The present paper will carry on an in-depth study on IGCC industry technology roadmap in China. Technology roadmap is a kind of technology management tool, expressing the structure and time dimension of technical elements’ evolution with icons. It spans a wide range of applications from a single company to industry, and national and international coalition, from detailed product technology to component technology, as well as the integration of several relevant industry technologies. The roadmap is a kind of multi-layered time-dependent icon. IGCC industry has excellent environmental characteristics and benefits, which are in accordance with the principle of coordinated development between energy and environment. Based on the analysis of current situation, market demand, industry objectives and technical barriers of IGCC technology, we highlight IGCC industrial development model with Chinese characteristics, and concisely propose the major research needs and technology projects of key technology areas in IGCC industry. We highlight IGCC industrial development model with Chinese characteristics, and concisely propose the major research needs and technology projects of key technology areas in IGCC industry. Furthermore, some relevant suggestions on IGCC technology management and industry development are put forward to promote the remarkable progress in the development of IGCC industry in China and build an efficient, economical and clean sustainable energy supply system in line with the requirements of low-carbon economy.
Characterising Room Temperature THz Metal Shielding Using the Engineering Approach
Stepan Lucyszyn;Yun Zhou
PIER , 2010, DOI: 10.2528/PIER10030801
Abstract: This paper applies the recently introduced electrical engineering approach to investigate room temperature THz metal shielding, using the accurate classical relaxation-effect frequency dispersion model. It is shown that, with the simplest case of a uniform plane wave at normal incidence to an infinite single planar shield in air, all figure of merit parameters for the shield can be accurately characterized. The errors introduced by adopting the traditional and much simpler classical skin-effect model are also quantified. In addition, errors resulting from adopting well-established approximations have also been investigated and quantified. It is shown that the engineering approach allows analytical expressions to be greatly simplified and predictive equivalent transmission line models to be synthesized, to give a much deeper insight into the behaviour of room temperature THz metal shielding. For example, it is shown that figures of merit and associated errors (resulting from the use of different classical frequency dispersion models) become essentially thickness invariant when the physical thickness of the shield is greater than 3 normal skin depths.
Engineering Approach to Modelling Frequency Dispersion Within Normal Metals at Room Temperature for THz Applications
Stepan Lucyszyn;Yun Zhou
PIER , 2010, DOI: 10.2528/PIER09121506
Abstract: When compared to the over-simplified classical skin-effect model, the accurate classical relaxation-effect modelling approach for THz structures at room temperature can be mathematically cumbersome and not insightful. This paper introduces various interrelated engineering concepts as tools for characterizing the intrinsic frequency dispersive nature of normal metals at room temperature. This engineering approach dramatically simplifies otherwise complex analysis and allows for a much deeper insight to be gained into the classical relaxation-effect model. For example, it explains simply how wavelength increases with frequency at higher terahertz frequencies. This is the first time that such an approach has been applied for the modelling of intrinsic frequency dispersion within a metal. While the focus has been on the characterization of normal metals (magnetic and non-magnetic) at room temperature, it is believed that the same methodology may be applied to metals operating in anomalous frequency-temperature regions, semiconductors, semiconductors, carbon nanotubes and metamaterials.
Modelling of Reconfigurable Terahertz Integrated Architecture (Retina) SIW Structures
Yun Zhou;Stepan Lucyszyn
PIER , 2010, DOI: 10.2528/PIER10041806
Abstract: This paper discusses for the first time the combined optoelectronic-electromagnetic modelling of a new technology that represents a paradigm shift in the way millimetre-wave and terahertz electronics can be implemented using the REconfigurable Terahertz INtegrated Architecture (RETINA) concept. Instead of having traditional metal-pipe rectangular waveguide structures with metal sidewalls, RETINA structures have photo-induced virtual sidewalls within a high resistivity silicon substrate. This new class of substrate integrated waveguide (SIW) technology allows individual components to be made tuneable and subsystems to be reconfigurable, by changing light source patterns. Detailed optoelectronic modelling strategies for the generation of virtual sidewalls and their electromagnetic interactions are presented in detail for the first time. It is found with double-sided illuminated RETINA structures that an insertion loss of 1.3 dB/ at 300 GHz is predicted for the dominant TE mode and for a cavity resonator a Q-factor of 4 at 173 GHz is predicted for the TE mode. While predicted losses are currently greater than other non-tuneable/reconfigurable SIW technologies, there is a wide range of techniques that can improve their performance, while still allowing completely arbitrary topologies to be defined in the plane. For this reason, it is believed that this technology could have a profound impact on the future of millimetre-wave and terahertz electronics. As a result, this paper could be of interest to research groups that have the specialised experimental resources to implement practical demonstrator exemplars.
Effects of NaCl Stress on Cotton Tissue Culture and Plant Regeneration
Zhang Baohong,Zhou Yun
Pakistan Journal of Biological Sciences , 1999,
Abstract: Hypocotyl and callus of cotton (Gossypium hirsutum L. cv. Coker 201)were cultured on MS basal medium supplemented with various concentrations of NaCl in order to study the effects of salt stress on callus induction, growth, proliferation, embryogenesis and plant regeneration of cotton. Experiment results indicated that along with the increase of NaCl level, the percentage of induction, the growth rate, the survival rate, the moisture content, embryogenesis rate of cotton callus, and the plant regeneration rate and normal seedling rate of cotton tissue culture decreased.
The Training Strategy of Professional Core Competencies of Talents in Competitive Intelligence
Zhou Yun,Wang Ziyan
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: Competitive intelligence is the natural product of modern economic development. As the rapid development of competitive intelligence sources, new techniques and methods are required in competitive intelligence system. Enhancing the techniques of data mining, business administration and applied economics is adopted, in order to promote the professional core competencies. In the light of this, knowledge structure and ability structure of talents are improved for the benefit of development of competitive intelligence.
Stress Distributions Due to a Concentrated Force on Viscoelastic Half-Space
Yun Peng,Debao Zhou
Journal of Computations & Modelling , 2012,
Abstract: A model of a viscoelastic infinite half-space with a concentrated tangential force applied on the boundary, namely, the viscoelastic Cerruti’s problem, is presented in this paper, with the derivation of the stress distributions by applying the elastic-viscoelastic correspondence principle to the displacements from the classic Cerruti’s problem. In the background viscoelastic materials, based on elastic-viscoelastic correspondence principle, the displacements of the classic Cerruti’s problem should have the similar expressions to elastic solutions but vary with time. Two auxiliary functions were used to replace the time components in displacements, which reduces the complexity. By satisfying the boundary conditions and balance conditions, the two auxiliary functions can be determined after solving two Volterra integral equations. With displacements known, the strains and stresses can be obtained. The results were also show that the two solutions match.
Minimal model of a heat engine: An information theory approach
Yun Zhou,Dvira Segal
Physics , 2010, DOI: 10.1103/PhysRevE.82.011120
Abstract: We construct a generic model for a heat engine using information theory concepts, attributing irreversible energy dissipation to the information transmission channels. Using several forms for the channel capacity, classical and quantum, we demonstrate that our model recovers both the Carnot principle in the reversible limit, and the universal maximum power efficiency expression of nonreversible thermodynamics in the linear response regime. We expect the model to be immensely useful as a testbed for studying fundamental topics in thermodynamics.
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