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Josephson Effect of Dilute Bose-Einstein Condensates in Laser-Modulated Double Wells
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作者 李燕 刘敏 詹明生 《Chinese Physics Letters》 SCIE CAS CSCD 2007年第3期675-678,共4页
The Josephson effect of Bose condensates with a weak link created by superposing a far-off-resonant red-detuned laser beam on a double-well potential is theoretically considered. The numerical simulations show that th... The Josephson effect of Bose condensates with a weak link created by superposing a far-off-resonant red-detuned laser beam on a double-well potential is theoretically considered. The numerical simulations show that there would be c/ear Josephson effect for this sort of three-well system. The present work gives a feasible scheme to study a new type of weak link which is crucial to investigate experimentally the Josephson effect. 展开更多
关键词 weak links INTERFERENCE GAS SUPERFLUID VORTEX ATOMS
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Optimization of intergrain connection in high-temperature superconductor Bi_2Sr_2CaCu_2O_x
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作者 李成山 张胜楠 +3 位作者 郝清滨 马小波 卢天倪 张平祥 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第7期475-480,共6页
A modified spark plasma sintering(SPS) technique was developed for the fabrication of Bi2Sr2CaCu2Ox(Bi-2212)superconducting bulks with better intergrain connections. The influences of the modified SPS process on t... A modified spark plasma sintering(SPS) technique was developed for the fabrication of Bi2Sr2CaCu2Ox(Bi-2212)superconducting bulks with better intergrain connections. The influences of the modified SPS process on the microstructures, intergrain connections, and related superconducting properties were systematically analyzed. The modified SPS process can not only increase the final density of the bulk samples but also enhance the texture structures. Clean grain boundaries were obtained instead of the intergrain amorphous layers. Therefore the intergranular properties were obviously improved. Due to the better intergrain connections and the stronger flux pinning properties, the critical current densities of the Bi-2212 bulks obtained via the modified SPS process were greatly increased. The obtained improvements imply the possibility for the modified SPS technique to be used for enhancing the superconducting properties of the Bi-2212 tapes. 展开更多
关键词 high temperature superconductor Bi2Sr2CaCu2Ox(Bi-2212) spark plasma sintering weak link
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Electric power generation technology of natural gas pressure reduction:Insights from black box-gray box hierarchical exergy analysis and evaluation method
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作者 Zhi-Dong Li Qing-Lin Cheng +4 位作者 You-Wang Chen Jiang-Dong Wei Li-Li Lv Hao Wu Yang Liu 《Petroleum Science》 SCIE CAS CSCD 2022年第1期329-338,共10页
Based on the“three box”exergy analysis model,a black box-gray box hierarchical exergy analysis and evaluation method is put forward in this paper,which is applied to evaluate the power generation technology of diffe... Based on the“three box”exergy analysis model,a black box-gray box hierarchical exergy analysis and evaluation method is put forward in this paper,which is applied to evaluate the power generation technology of differential pressure produced by natural gas expansion.By using the exergy analysis theory,the black box-gray box hierarchical exergy analysis models of three differential pressure power generation technologies are established respectively.Firstly,the“black box”analysis models of main energy consuming equipment are established,and then the“gray box”analysis model of the total system is established.Based on the calculation results of exergy analysis indexes,the weak energy consumption equipment in the whole power generation process is accurately located.Taking a gas field in southwest China as an example,the comprehensive energy consumption evaluation of the three power generation technologies is carried out,and the technology with the best energy consumption condition among the three technologies is determined.Finally,the rationalization improvement measures are put forward from improving the air tightness,replacing the deflector and reducing the flow loss. 展开更多
关键词 Expansion differential pressure power generation Black box-gray box hierarchy Exergy analysis method weak link of energy consumption
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Properties of YBa_2Cu_3O_(7-δ) Granular Josephson Junction
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作者 Abbas A. Essa 《Advances in Manufacturing》 2000年第2期116-118,共3页
YBa 2Cu 3O 7-δ weak link junctions with width from 0.1 mm to 0.3 mm and length from 0.2 mm to 0.5 mm was made by hand with a razor blade. The current voltage characteristics of the microbridges show, under... YBa 2Cu 3O 7-δ weak link junctions with width from 0.1 mm to 0.3 mm and length from 0.2 mm to 0.5 mm was made by hand with a razor blade. The current voltage characteristics of the microbridges show, under microwave irradiation, pronounced Shapiro steps up to transition temperature. A careful measurement of the dependence of the critical supercurrent on the external magnetic field and laser light is presented. 展开更多
关键词 high temperature superconductivity YBa 2Cu 3O 7 δ Josephson junction weak link
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Emergence of Community Structure in the Adaptive Social Networks 被引量:1
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作者 Long Guo Xu Cai 《Communications in Computational Physics》 SCIE 2010年第9期835-844,共10页
In this paper,we propose a simple model of opinion dynamics to construct social networks,based on the algorithm of link rewiring of local attachment(RLA)and global attachment(RGA).Generality,the system does reach a st... In this paper,we propose a simple model of opinion dynamics to construct social networks,based on the algorithm of link rewiring of local attachment(RLA)and global attachment(RGA).Generality,the system does reach a steady state where all individuals'opinion and the complex network structure are fixed.The RGA enhances the ability of consensus of opinion formation.Furthermore,by tuning a model parameter p,which governs the proportion of RLA and RGA,we find the formation of hierarchical structure in the social networks for p>p_(c).Here,p_(c) is related to the complex network size N and the minimal coordination number 2K.The model also reproduces many features of large social networks,including the“weak links”property. 展开更多
关键词 Opinion dynamics social network community structure weak links property
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