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Optimal regulation of flexible loads in rural residential buildings considering mobile batteries:A case study in Shaanxi Province

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Building Simulation 2024年第7期17卷 1065-1083页

作者： xi Luo WenceShi School of Building services Science and Engineering Xian University of Architecture and Technology(XAUAT)Xi'an 710055China state key laboratory of Green Building Xi'an 710055China

While the grid-connected capacity of rural household photovoltaics is increasing rapidly,achieving dynamic supply-demand matching despite fluctuations in solar energy is *** the rapid development of rural electrification,battery-powered technologies,such as electric vehicles and electric agricultural machinery,are becoming increasingly popular in rural *** this context,utilizing idle mobile batteries to assist in energy storage for rural residential buildings offers a new way to solve the problem of dynamic supply-demand *** this study,a field survey was conducted on several typical fruit-growing villages in the Central Shaanxi Plain in Shaanxi Province of *** rural households were selected to calculate the electricity loads of the residential buildings,with due consideration to the intervention of mobile *** the premise of installing 3 kW household photovoltaic systems in rural households,an economical efficiency-oriented model was built for the optimal regulation of flexible *** results were compared in the context of two patterns of electricity consumption,i.e.,unidirectional charging of mobile batteries from buildings and bidirectional charging and discharging between mobile batteries and *** bidirectional pattern significantly increased the photovoltaic consumption of typical rural households on various typical ***,during both scenarios of not implementing time-of-use and implementing time-of-use,the typical day of the winter slack farming season exhibited the best photovoltaic consumption effect among all types of typical ***,the bidirectional pattern also result in a significant increase in the annual electricity sales revenues for typical rural households.

关键词： demand-side response flexible load mobile battery household photovoltaics

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Novel strengthening methods for ultralightweight sandwich structures with periodic lattice cores

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Science china(Technological Sciences) 2010年第3期53卷 875-877页

作者： LU TianJian 1 &ZHANG QianCheng 2 1 MOE key laboratory for Strength and Vibration,School of Aerospace,xi’an Jiaotong university,xi’an 710049,china 2 state key laboratory for Mechanical Behavior of Materials,School of Material Science and Engineering,xi’an Jiaotong university,xi’an 710049,china MOE key laboratory for Strength and Vibration School of Aerospace Xi’an Jiaotong University Xi’an China state key laboratory for Mechanical Behavior of Materials School of Material Science and Engineering Xi’an Jiaotong University Xi’an China

Recent development of ultralightweight lattice-cored sandwiches is reviewed,with focus placed on various novel fabrication methods introduced to strengthen these structures,covering not only research results published... 详细信息

关键词： cellular metals strengthening method fabrication sandwich panels

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EXPERIMENTAL　RESEARCH　ON　DIRECTIONAL　SOLIDIFICATION　OF　Al－4．5wt％Cu　ALLOY　BY　ACRT　METHOD

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Acta Metallurgica Sinica(English Letters) 1996年第1期9卷 17-22页

作者： JIE Wanqi(state key laboratory of Solidification Processing,Northwestern Polytechnical university,xi’an 710072,china) Northwestern Polytechnical Univ Xi'an China

Accelerated crucible rotation technique(ACRT) has been used for the directional solidification of Al-4.5wt% Cu binary *** rotating the crucible at varying rate and direction,forced liquid flows are aroused These flows include Ekman flow,Couette flow and Spiral Shear ***,Ekman flow acts directly at the L/S interface,changes diffusion and heat exchange conditions and has strong influences on the morphology of L/S *** results show that,compared with normal Bridgman specimens,the solidification region is much narrower and the cell spacing is much smaller in ACRT *** influences become much stronger when the accelerating rate is increased.

关键词： accelerated crucible rotation technique(ACRT) Al-4.5wt%Cu directional solidification morphology of L/S interface cell spacing

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STUDY ON STATISTICALLY-FAIR SERVICE IN STATISTICALLY-MULTIPLEXED networkS

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Journal of Electronics(china) 2000年第3期17卷 261-269页

作者： Cheng Dongnian Liu Zengji (National key laboratory on integrated services networks, xidian university, xi’an 710071)

A new type of fair service, referred to as Statistically-Fair Service (SFS), is proposed in this paper. The SFS discipline is given based on the SFS criterion. Compared to "strict" fair service available, SFS is mainly characterized by its flexible suitability for the nature of statistically-multiplexed networks. By its statistically-fair service to users, therefore, SFS can ensure well end-to-end QoS requirements on a statistical basis with a benefit of enhancement in network utilization. Two useful properties of SFS is presented. One of them, the property of retaining Exponentially Bounded Burstiness(EBB), can facilitate end-to-end delay estimation of EBB-type traffic. Finally, some numerical results obtained from a simulation study on SFS shows that an SFS-equipped node in steady states will in deed retain the EBB attribute of any input flow.

关键词： Fair service/queueing Quality of Service(QoS) Statistical multiplexing Exponential probability bounds

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Energy consumption simulations of rural residential buildings considering differences in energy use behavior among family members

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Building Simulation 2024年第8期17卷 1335-1358页

作者： xi Luo Lina Du School of Building services Science and Engineering Xi'an University of Architecture and Technology(XAUAT)Xi'an 710055China state key laboratory of Green Building Xi'an 710055China

The“average occupant”methodology is widely used in energy consumption simulations of residential buildings;however,it fails to consider the differences in energy use behavior among family *** on a field survey on the Central Shaanxi Plain,to identify the energy use behavior patterns of typical families,a stochastic energy use behavior model considering differences in energy use behavior among family members was proposed,to improve the accuracy of energy consumption simulations of residential *** results indicated that the surveyed rural families could be classified into the following four types depending on specific energy use behavior patterns:families of one elderly couple,families of one middle-aged couple,families of one elderly couple and one child,and families of one couple and one ***,on typical summer days,the results of daily building energy consumption simulation obtained by the“average occupant”methodology were 25.39%and 28%lower than the simulation results obtained by the model proposed in this study for families of one elderly couple and families of one middle-aged couple,and 13.05%and 23.05%higher for families of one elderly couple and one child,and families of one couple and one *** typical winter days,for the four types of families,the results of daily building energy consumption simulation obtained by the“average occupant”methodology were 21.69%,10.84%,1.21%,and 8.39%lower than the simulation results obtained by the model proposed in this study,respectively.

关键词： typical energy use behavior pattern differences in occupant behavior building energy consumption simulation stochastic energy use behavior simulation

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Electromagnetic Confinement and Shaping for Plate-Form Part

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Journal of Materials Science & Technology 2000年第1期16卷 27-32页

作者： Jun SHEN, Jianguo LI and Hengzhi FU (state key laboratory of Solidification Processing, Northwestern Polytechnic university, xi’an 710072, china) Junyi SU (xi’an Jiaotong university,xi’an 710049, china) state key laboratory of Solidification Processing Northwestern Polytechnic University Xi'an 710072 China xi'an Jiaotong university Xi'an 710049 China

than 2.2, the electromagnetic pressure acting on melt can be simply expressed as Pm =B^2/wμ, and the melt shape would be known only by measuring the distribution of magnetic flux density. As a is small and makes the ratio a/8 less than 2.2, the melt shape and electromagnetic pressure for confining and shaping are determined not only by magnetic flux density B but also by melt thickness a, electromagnetic parameter μγ and current frequency f. In this paper, an equation used to calculate electromagnetic pressure acting on 'thin plate-form melt' is brought forward. The equation gives a precise relationship between electromagnetic pressure factor p and melt thickness a, electromagnetic parameter μγ and current frequency f.

关键词： Electromagnetic Confinement and Shaping for Plate-Form Part Form

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Multi-symplectic method to analyze the mixed state of Ⅱ-superconductors

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Science china(Physics,Mechanics & Astronomy) 2008年第12期51卷 1835-1844页

作者： HU WeiPeng1↑ & DENG ZiChen1,2 1 School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical university, xi’an 710072, china 2 state key laboratory of Structural Analysis of Industrial Equipment, Dalian university of Technology, Dalian 116023, china School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi’an China state key laboratory of Structural Analysis of Industrial Equipment Dalian University of Technology Dalian China

The mixed state of two-band II-superconductor is analyzed by the multi-symplectic method. As to the Ginzburg-Landau equation depending on time that describes the mixed state of two-band II-superconductor, the multi-symplectic formulations with several conservation laws: a multi-symplectic conservation law, an energy con- servation law, as well as a momentum conservation law, are presented firstly; then an eighteen points scheme is constructed to simulate the multi-symplectic partial differential equations (PDEs) that are derived from the Ginzburg-Landau equation; finally, based on the simulation results, the volt-ampere characteristic curves are obtained, as well as the relationships between the temperature and resistivity of a suppositional two-band II-superconductor model under different magnetic intensi- ties. From the results of the numerical experiments, it is concluded that the notable property of the mixed state of the two-band II-superconductor is that: The trans- formation temperature decreases and the resistivity ρ increases rapidly with the increase of the magnetic intensity B. In addition, the simulation results show that the multi-symplectic method has two remarkable advantages: high accuracy and excellent long-time numerical behavior.

关键词： two-band Ginzburg-Landau equation mixed state multi-symplectic conservation law

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Micro-and Nano-structure Characterization of Isotropic Pyrocarbon Obtained via Chemical Vapor Deposition in Hot Wall Reactor

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Journal of Materials Science & Technology 2010年第12期26卷 1133-1138页

作者： Kezhi Li,Dongsheng Zhang,Lingjun Guo and Hejun Li state key laboratory of Solidification Processing,Northwestern Polytechnical university,xi an 710072,china state key laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China

The hot wall reactor was used to deposit isotropic pyrocarbon. The density of the product was measured by Archimedes method. The fracture morphology and texture of the product were investigated by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. Raman spectroscopy was also applied to characterizing the structure of the product. The results show that the density of the product is about 1.31 g/cm^3. The pyrocarbon consists of granular particles with the size of about 1.5 μm under SEM images. Under TEM images, the pyrocarbon is composed of irregular grains and onion-like particles are also detected. The orientation angle （180 deg.） of pyrocarbon reveals its isotropic character. The ID/IG ratio in Raman spectrum is about 1.2, indicating the isotropic feature of the product qualitatively.

关键词： Isotropic pyrocarbon Chemical vapor deposition Structure characterization Onion-like pyrocarbon

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Quantum Authentication Based on the Lengthened String Scheme

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The Journal of china Universities of Posts and Telecommunications 2004年第Z1期11卷 14-17,25页

作者： GUO Fen-zhuo~(1,2), WEN Qiao-yan~1, ZHU Fu-chen~3 1.School of Science, Beijing university of Posts and Telecommunications, Beijing 100876, P.R. china 2.state key laboratory of integrated services network, xidian university, xi’an 710071, P.R. china 3.National laboratory for Secure Communication, Chengdu 610041, P.R. china School of Science Beijing University of Posts and Telecommunications Beijing 100876 P.R. China state key laboratory of integrated services network Xidian University Xi'an 710071 P.R. China School of Science Beijing University of Posts and Telecommunications Beijing 100876 P.R. China National laboratory for Secure Communication Chengdu 610041 P.R. China

Assuming there is a shared string between the users, we present a novel scheme, the lengthened string scheme (LSS), where the shared string is lengthened firstly by a specially designed algorithm, then some special treatments are applied on the lengthened one before it is used to authenticate. Based on the lengthened string scheme (LSS) we propose a quantum authentication protocol using entanglements. And the robustness of our protocol is discussed. In fact all the quantum key distribution protocols can do identification simultaneously based on the LSS.

关键词： quantum cryptography quantum authentication quantum key distribution LSS

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Stability of stratified flow and slugging in horizontal gas-liquid flow

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Progress in Natural Science:Materials International 2005年第11期15卷 1026-1034页

作者： GU Hanyang and GUO Liejin (state key laboratory of Multiphase Flow in Power Engineering, xi’an Jiaotong university, xi’an 710049, china) state key laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

A transient one-dimensional two-fluid model is proposed to investigate numerically the interfacial instability and the onset of slugging for liquid-gas flow in a horizontal duct. In the present model, the effects of surface tension and transverse variations in dynamic pressure are taken into account. The evolution of interfacial disturbances is displayed and compared with the linear viscous Kelvin-Helmholtz stability analyses. It shows that interfacial wave is more instable due to the non-linear effect. The model predicts well the stability limit of stratified flow in comparison with the experimental data, and also automatically tracks the onset of slugging. The results show that the initiation of hydrodynamic slugging is related to local interfacial instability. Based on the cycle of slugging, a model for slug frequency is presented, which predicts the trends of slug frequencies with gas/liquid flow rate well in comparison with the available data. The effects of physical properties on slugging have been examined. It is found that with the increase in the gas viscosity and liquid density the slugging would be inhibited, whereas, with the increase in liquid viscosity and gas density, the slugging can be promoted.

关键词： two-fluid model Kelvin-Helmholtz stability interfacial instability onset of slugging gas-liquid stratified flow.

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