Pub Date : 1999-06-01DOI: 10.1088/1004-423X/8/6/005
Zhu Jun, Gou Qing-Quan
A three-parameter nonlinear dynamical model, i.e., the quantized discrete self-trapping equation, was used to calculate the highly excited CH stretching vibrational energy levels of liquid phase CH3CN molecule in the electronic ground state up to n=7. The calculated results show that the experimental energy levels can be well described by the model.
{"title":"CALCULATION OF HIGHLY EXCITED VIBRATIONAL ENERGY LEVELS OF CH 3 CN MOLECULE BY NON-LINEAR QUANTUM THEORY","authors":"Zhu Jun, Gou Qing-Quan","doi":"10.1088/1004-423X/8/6/005","DOIUrl":"https://doi.org/10.1088/1004-423X/8/6/005","url":null,"abstract":"A three-parameter nonlinear dynamical model, i.e., the quantized discrete self-trapping equation, was used to calculate the highly excited CH stretching vibrational energy levels of liquid phase CH3CN molecule in the electronic ground state up to n=7. The calculated results show that the experimental energy levels can be well described by the model.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116604669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1088/1004-423X/8/6/010
Lin De-ming, Wang Hua-sheng, Wu Yi-chu, Lin Mu-liang
The σ-T and dσ/dT-T curves of the FeCuNbSiB amorphous alloy, which are the relationship between "apparent weight loss" and temperature, are investigated by magnetic thermogravimetry analysis (MTGA) technique. It is found that the crystallization process of the samples can be divided into five stages. The studies of samples annealed in the temperature range of 480-610 °C for 1 h show that when the annealing temperature (Ta) is lower than 540 °C, the quantity of nanocrystalline α-Fe(Si) phase increases evidently with Ta, and the Curie temperature (TC) of residual amorphous phase also increases linearly with Ta, i.e., TC=0.52Ta+91.7 °C, with correlation coefficient γ=0.98. The variation of volume fraction of α-Fe(Si) nanocrystalline phase or residual amorphous phase with Ta is measured.
{"title":"Studies of nanocrystalline phase and residual amorphous phase of FeCuNbSiB alloy","authors":"Lin De-ming, Wang Hua-sheng, Wu Yi-chu, Lin Mu-liang","doi":"10.1088/1004-423X/8/6/010","DOIUrl":"https://doi.org/10.1088/1004-423X/8/6/010","url":null,"abstract":"The σ-T and dσ/dT-T curves of the FeCuNbSiB amorphous alloy, which are the relationship between \"apparent weight loss\" and temperature, are investigated by magnetic thermogravimetry analysis (MTGA) technique. It is found that the crystallization process of the samples can be divided into five stages. The studies of samples annealed in the temperature range of 480-610 °C for 1 h show that when the annealing temperature (Ta) is lower than 540 °C, the quantity of nanocrystalline α-Fe(Si) phase increases evidently with Ta, and the Curie temperature (TC) of residual amorphous phase also increases linearly with Ta, i.e., TC=0.52Ta+91.7 °C, with correlation coefficient γ=0.98. The variation of volume fraction of α-Fe(Si) nanocrystalline phase or residual amorphous phase with Ta is measured.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134372796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1088/1004-423X/8/6/011
Li Yu-tong, Gu Yuqiu, L. Yingjun, Z. Jie, Chunyu Shutai, You Yong-lu, He Shao-Tang, Huang Wen-zhong, He Ying-Ling, Lu Li-zhu, Yuan Xiao-dong, Wei Xiao-feng, Zhang Chuan-fei
A comparison has been made of performance of the neon-like chromium soft x-ray lasing at 28.5 nm driven by a double 900 ps pulse at 6 TW/cm2, with that driven by a double 200 ps pulse at similar irradiance. The double 200 ps pulse has been found to be much more efficient to drive x-ray lasing with higher intensity.
{"title":"Performance comparison of the neon-like chromium soft x-ray lasing driven by a double laser pulse with different duration","authors":"Li Yu-tong, Gu Yuqiu, L. Yingjun, Z. Jie, Chunyu Shutai, You Yong-lu, He Shao-Tang, Huang Wen-zhong, He Ying-Ling, Lu Li-zhu, Yuan Xiao-dong, Wei Xiao-feng, Zhang Chuan-fei","doi":"10.1088/1004-423X/8/6/011","DOIUrl":"https://doi.org/10.1088/1004-423X/8/6/011","url":null,"abstract":"A comparison has been made of performance of the neon-like chromium soft x-ray lasing at 28.5 nm driven by a double 900 ps pulse at 6 TW/cm2, with that driven by a double 200 ps pulse at similar irradiance. The double 200 ps pulse has been found to be much more efficient to drive x-ray lasing with higher intensity.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124950245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1088/1004-423X/8/6/002
Liang Jiu-qing, Ding Xiu-xiang
The Larmor precession of a spinning particle in a magnetic field confined in the region of one dimensional-rectangular barrier is investigated with the spin coherent state of incoming particle, which has advantage to recognize the equation of the spin precession. Our new observation is that the precession time of spin is uniquely determined and is seen to be equal to the dwell time.
{"title":"Larmor Precession and the Barrier Interaction Time","authors":"Liang Jiu-qing, Ding Xiu-xiang","doi":"10.1088/1004-423X/8/6/002","DOIUrl":"https://doi.org/10.1088/1004-423X/8/6/002","url":null,"abstract":"The Larmor precession of a spinning particle in a magnetic field confined in the region of one dimensional-rectangular barrier is investigated with the spin coherent state of incoming particle, which has advantage to recognize the equation of the spin precession. Our new observation is that the precession time of spin is uniquely determined and is seen to be equal to the dwell time.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121111098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1088/1004-423X/8/6/003
Chen Guanrong, Fang Jin-qing, Hong Yiguang, Qin Huashu
Bifurcation control has attracted increasing attention in recent years. A simple and unified state-feedback method is developed in this paper for Hopf bifurcation control for continuous-time systems. The control task can be either shifting an existing Hopf bifurcation or creating a new Hopf bifurcation. Some computer simulations are included to illustrate the method and verify the theoretical results.
{"title":"CONTROLLING HOPF BIFURCATIONS: CONTINUOUS-TIME SYSTEMS","authors":"Chen Guanrong, Fang Jin-qing, Hong Yiguang, Qin Huashu","doi":"10.1088/1004-423X/8/6/003","DOIUrl":"https://doi.org/10.1088/1004-423X/8/6/003","url":null,"abstract":"Bifurcation control has attracted increasing attention in recent years. A simple and unified state-feedback method is developed in this paper for Hopf bifurcation control for continuous-time systems. The control task can be either shifting an existing Hopf bifurcation or creating a new Hopf bifurcation. Some computer simulations are included to illustrate the method and verify the theoretical results.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116632458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1088/1004-423X/8/6/009
Huang Li-lei, Fang Da-wei, H. Zhi
From transition-rate-equations and transmission-equations the formulas of threshold power and slope efficiency of an end-pumped laser for a four-level system are deduced. Citing the laser of Er:YAG as an example, we have discussed the differences of laser output characteristics between the three- and four-level systems.
{"title":"ANALYSES OF OUTPUT CHARACTERISTICS FOR FOUR-LEVEL SYSTEM LASER","authors":"Huang Li-lei, Fang Da-wei, H. Zhi","doi":"10.1088/1004-423X/8/6/009","DOIUrl":"https://doi.org/10.1088/1004-423X/8/6/009","url":null,"abstract":"From transition-rate-equations and transmission-equations the formulas of threshold power and slope efficiency of an end-pumped laser for a four-level system are deduced. Citing the laser of Er:YAG as an example, we have discussed the differences of laser output characteristics between the three- and four-level systems.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126289075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1088/1004-423X/8/6/006
Ren Ting-qi
Accurate reactive scattering calculations of reactive probabilities and integral cross sections for the system D+H2 → DH+H were carried out by using the quantum mechanical time-dependent wave packet methods. In order to simplify the calculation, we introduced the centrifugal sudden approximation to reduce the effective degrees of freedom, and show results of new calculations. In particular, the present calculations were extended to all angular momentum and obtained reaction cross sections for a range of energies. The results were also compared with those of other theoretical calculations and the differences were discussed.
{"title":"Accurate quantum chemical calculation of cross sections for the system D+H2 DH+H","authors":"Ren Ting-qi","doi":"10.1088/1004-423X/8/6/006","DOIUrl":"https://doi.org/10.1088/1004-423X/8/6/006","url":null,"abstract":"Accurate reactive scattering calculations of reactive probabilities and integral cross sections for the system D+H2 → DH+H were carried out by using the quantum mechanical time-dependent wave packet methods. In order to simplify the calculation, we introduced the centrifugal sudden approximation to reduce the effective degrees of freedom, and show results of new calculations. In particular, the present calculations were extended to all angular momentum and obtained reaction cross sections for a range of energies. The results were also compared with those of other theoretical calculations and the differences were discussed.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131729031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1088/1004-423X/8/6/001
Fang Mao-Fa, Zhou Qing-ping, Zhou Peng
A scheme to generate the two-mode field entangled states is proposed, based on the Raman interaction of an effective two-level atom with the pump and Stokes fields. The degree of the entanglement between the two field modes in the entangled states is also studied.
{"title":"Entangled states of cavity fields via the Raman interaction","authors":"Fang Mao-Fa, Zhou Qing-ping, Zhou Peng","doi":"10.1088/1004-423X/8/6/001","DOIUrl":"https://doi.org/10.1088/1004-423X/8/6/001","url":null,"abstract":"A scheme to generate the two-mode field entangled states is proposed, based on the Raman interaction of an effective two-level atom with the pump and Stokes fields. The degree of the entanglement between the two field modes in the entangled states is also studied.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129943951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-05-20DOI: 10.1088/1004-423X/8/5/009
Feng Yong, Z. Lian, Shi Lei, Yang Wan-min, Zhang Cui-ping, Wan Jingrong, Du Ze-hua, Yu Ze-min, Wu Xiaozu, Zhang Yuheng
We prepared highly textured YBa2Cu3Oy and Y0.6Er0.4Ba2Cu3Oy bulk samples by a powder melting process method under the same conditions and studied the magnetic properties and flux pinning characteristics. It is found that the Jc estimated by the Bean's model decreases with the magnetic field according to a power law Jc ∞ B-n (n < 0.55), suggesting that Jc values of these materials are controlled by the flux pinning rather than weak links. Also, Jc and flux pinning are improved by the Er addition. The reduction of the size of Y2BaCuO5 particles, magnetic pinning and stress-field pinning caused by the Er addition may be responsible for the enhancement of Jc and flux pinning.
{"title":"Critical current density and flux pinning characteristics in melt-textured Y 0.6 Er 0.4 Ba 2 Cu 3 O y superconductor","authors":"Feng Yong, Z. Lian, Shi Lei, Yang Wan-min, Zhang Cui-ping, Wan Jingrong, Du Ze-hua, Yu Ze-min, Wu Xiaozu, Zhang Yuheng","doi":"10.1088/1004-423X/8/5/009","DOIUrl":"https://doi.org/10.1088/1004-423X/8/5/009","url":null,"abstract":"We prepared highly textured YBa2Cu3Oy and Y0.6Er0.4Ba2Cu3Oy bulk samples by a powder melting process method under the same conditions and studied the magnetic properties and flux pinning characteristics. It is found that the Jc estimated by the Bean's model decreases with the magnetic field according to a power law Jc ∞ B-n (n < 0.55), suggesting that Jc values of these materials are controlled by the flux pinning rather than weak links. Also, Jc and flux pinning are improved by the Er addition. The reduction of the size of Y2BaCuO5 particles, magnetic pinning and stress-field pinning caused by the Er addition may be responsible for the enhancement of Jc and flux pinning.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117272255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-05-20DOI: 10.1088/1004-423X/8/5/002
Zhang Jie-fang, Wu Feng-min
A simple and direct method is presented to solve the (2+1) dimensional long dispersive wave equation. We introduced a variable dependent transformation in order to convert this equation into the simple forms, which are three coupled linear and bilinear partial differential equations, and give the single and double soliton solutions and the (1, N) dromion solution.
{"title":"A simple soliton solution method for the (2+1) dimensional long dispersive wave equations","authors":"Zhang Jie-fang, Wu Feng-min","doi":"10.1088/1004-423X/8/5/002","DOIUrl":"https://doi.org/10.1088/1004-423X/8/5/002","url":null,"abstract":"A simple and direct method is presented to solve the (2+1) dimensional long dispersive wave equation. We introduced a variable dependent transformation in order to convert this equation into the simple forms, which are three coupled linear and bilinear partial differential equations, and give the single and double soliton solutions and the (1, N) dromion solution.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114804731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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