发布求助
文献互助 智能选刊 最新文献

Science in China Series G: Physics and Astronomy最新文献

筛选
英文 中文
Calculation of LET in SEE simulation by pulsed laser 脉冲激光模拟SEE中LET的计算
Science in China Series G: Physics and Astronomy Pub Date : 2005-02-01 DOI: 10.1360/04YW0108
Jianguo Huang, Jianwei Han
{"title":"Calculation of LET in SEE simulation by pulsed laser","authors":"Jianguo Huang, Jianwei Han","doi":"10.1360/04YW0108","DOIUrl":"https://doi.org/10.1360/04YW0108","url":null,"abstract":"A key point in SEE (Single Event Effect) simulation experiment is how to calculate the equivalent LET (Linear Energy Transfer) for laser pulse. In this paper, the calculation method considering the influences of nonlinear absorption in semiconductor, reflection and refraction on device surface and other factors is presented. Simultaneously an instance of calculation is provided, with the result in good agreement with the SEU (Single Event Upset) threshold measured by heavy ions.","PeriodicalId":21584,"journal":{"name":"Science in China Series G: Physics and Astronomy","volume":"7 1","pages":"113-121"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82099331","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}
引用次数: 3
Dense coding scheme using superpositions of Bell-states and its NMR implementation 利用钟态叠加的密集编码方案及其核磁共振实现
Science in China Series G: Physics and Astronomy Pub Date : 2005-02-01 DOI: 10.1360/04YW0129
Jingfu Zhang, Jingyi Xie, Zhiwei Deng, Zhiheng Lu
{"title":"Dense coding scheme using superpositions of Bell-states and its NMR implementation","authors":"Jingfu Zhang, Jingyi Xie, Zhiwei Deng, Zhiheng Lu","doi":"10.1360/04YW0129","DOIUrl":"https://doi.org/10.1360/04YW0129","url":null,"abstract":"Dense coding using superpositions of Bell-states is proposed. The generalized Grover’s algorithm is used to prepare the initial entangled states, and the reverse process of the quantum algorithm is used to determine the entangled state in the decoding measurement. Compared with the previous schemes, the superpositions of two Bell-states are exploited. Our scheme is demonstrated using a nuclear magnetic resonance (NMR) quantum computer. The corresponding manipulations are obtained. Experimental results show a good agreement between theory and experiment. We also generalize the scheme to transmit eight messages by introducing an additional two-state system.","PeriodicalId":21584,"journal":{"name":"Science in China Series G: Physics and Astronomy","volume":"158 2 1","pages":"57-67"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77812199","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}
引用次数: 4
KTN thin films prepared by pulsed laser deposition on transparent single crystal quartz (100) 脉冲激光沉积透明单晶石英(100)制备KTN薄膜
Science in China Series G: Physics and Astronomy Pub Date : 2005-02-01 DOI: 10.1360/03YW0247
Xiaodong Wang, Xiao-feng Peng, Duan-ming Zhang
{"title":"KTN thin films prepared by pulsed laser deposition on transparent single crystal quartz (100)","authors":"Xiaodong Wang, Xiao-feng Peng, Duan-ming Zhang","doi":"10.1360/03YW0247","DOIUrl":"https://doi.org/10.1360/03YW0247","url":null,"abstract":"Using the Sol-Gel method to produce the KTN ultrafine powder and the sintering technique with K2O atmosphere to prepare KTN ceramics as the targets instead of the KTN single crystal, highly oriented KTN thin films were produced on the transparent single crystal quartz (100) by the pulsed laser deposition (PLD). Since the thermal stress sustained by the quartz is relatively small, the limit temperature of the quartz substrates (300°C) is much lower than that of the P-Si substrates (560°C); the prepared thin film is at amorphous state. Increasing the pulsed laser energy density in the process incorporated with annealing the film after deposition at different temperatures converts the amorphous films into crystal. The optimal pulsed laser energy density and annealing temperature were 2.0 J/cm2 and 600°C, respectively. A discussion was made to understand the mechanism of film production at relatively low substrate temperature by PLD and effects of the annealing temperatures on the forming of the perovskite phase, and optimal conditions for the orientation of the crystal grain.","PeriodicalId":21584,"journal":{"name":"Science in China Series G: Physics and Astronomy","volume":"13 1","pages":"33-43"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79176381","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}
引用次数: 1
Effects of cosmological constant on motion of UHECR particles 宇宙学常数对超hecr粒子运动的影响
Science in China Series G: Physics and Astronomy Pub Date : 2005-02-01 DOI: 10.1360/04YW0131
Shaoxia Chen, Zhe Chang
{"title":"Effects of cosmological constant on motion of UHECR particles","authors":"Shaoxia Chen, Zhe Chang","doi":"10.1360/04YW0131","DOIUrl":"https://doi.org/10.1360/04YW0131","url":null,"abstract":"Recent astronomical observations manifest that about two-thirds of the whole energy in the Universe is contributed by a small positive cosmological constant Λ (>0). Then, an asymptotically de Sitter spacetime is premised naturally. However, physics in the de Sitter spacetime is very different from that in the Minkowski spacetime. As the first step, a covariant formalism of the kinematics in the de Sitter spacetime is presented here. By solving exactly the equations of motion for a field, we obtain the dispersion relation of a free particle. It is noticed that the dispersion relation is dependent on the degree of freedom of angular momentum of the particle. We show the threshold anomaly of the ultra high energy cosmic ray disappears naturally in the framework of the de Sitter kinematics.","PeriodicalId":21584,"journal":{"name":"Science in China Series G: Physics and Astronomy","volume":"33 1","pages":"44-56"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86339860","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}
引用次数: 1
Near-infrared polarization study of L1641S L1641S近红外偏振研究
Science in China Series G: Physics and Astronomy Pub Date : 2005-02-01 DOI: 10.1360/03YW0224
Xuepeng Chen, Yong-qiang Yao
{"title":"Near-infrared polarization study of L1641S","authors":"Xuepeng Chen, Yong-qiang Yao","doi":"10.1360/03YW0224","DOIUrl":"https://doi.org/10.1360/03YW0224","url":null,"abstract":"H-band polarimetric images and Ks-band images of star formation region L1641S are presented. Two reflection nebulae, Re50N and Re50, are in the north and south of the region, respectively. The polarization maps of two nebulae exhibit high degrees of polarization and centrosymmetric patterns, indicating the single scattering and small dust grains in the nebulae. There are two infrared sources, IRS1 and IRS2 in the nebula Re50N. IRS1 is the illuminating source of the nebulae and the driving source of CO outflow; IRS2 is suggested to provide considerable light at optical wavelengths. The high polarization in Re50N can be interpreted as surface scattering from the outflow at an inclination of 30 degrees. Based on the polarization arc structure, we further identified the bipolar structure of the nebula Re50N. The FU Orionis phenomenon in L1641S is discussed at the end of this paper.","PeriodicalId":21584,"journal":{"name":"Science in China Series G: Physics and Astronomy","volume":"152 1","pages":"68-77"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79860465","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}
引用次数: 1
Formation and evolution mechanisms of large-clusters during rapid solidification process of liquid metal Al 液态金属Al快速凝固过程中大团簇的形成与演化机制
Science in China Series G: Physics and Astronomy Pub Date : 2005-02-01 DOI: 10.1360/03YW0121
Rang-su Liu, K. Dong, Fengxiang Liu, C. Zheng, Hai-rong Liu, Jiyong Li
{"title":"Formation and evolution mechanisms of large-clusters during rapid solidification process of liquid metal Al","authors":"Rang-su Liu, K. Dong, Fengxiang Liu, C. Zheng, Hai-rong Liu, Jiyong Li","doi":"10.1360/03YW0121","DOIUrl":"https://doi.org/10.1360/03YW0121","url":null,"abstract":"A molecular dynamics simulation study has been performed for the formation and evolution characteristics of nano-clusters in a large-scale system consisting of 400000 atoms of liquid metal Al. The center-atom method combined with pair-bond analysis technique and cluster-type index method (CTIM) has been applied here to describe the structural configurations of various basic clusters. It is demonstrated that both the 1551 bond-type and the icosahedral cluster (12 0 12 0) constructed by 1551 bond-types are dominant among all the bond-types and cluster-types, respectively, in the system and play a critical role in the microstructure transitions of liquid metal Al. The nano-clusters (containing up to 150 atoms) are formed by the combination of some middle and small clusters with distinctly different sizes, through mutual competition by unceasing annex and evolution in a seesaw manner (in turn of obtaining and losing), which do not occur as the multi-shell structures accumulated with an atom as the center and the surrounding atoms are arranged according to a certain rule. This is the essential distinction of nano-cluster in liquid metal from those obtained by gaseous deposition, ionic spray methods, and so on. Though the nano-clusters differ from each other in shape and size, all of them possess protruding corners that could become the starting points of various dendrite structures in the solidification processes of liquid metals.","PeriodicalId":21584,"journal":{"name":"Science in China Series G: Physics and Astronomy","volume":"36 1","pages":"101-112"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79450712","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}
引用次数: 3
A Legendre orthogonal moment based 3D edge operator 基于Legendre正交矩的三维边缘算子
Science in China Series G: Physics and Astronomy Pub Date : 2005-02-01 DOI: 10.1360/02WW0190
Hui Zhang, H. Shu, L. Luo, J. Dillenseger
{"title":"A Legendre orthogonal moment based 3D edge operator","authors":"Hui Zhang, H. Shu, L. Luo, J. Dillenseger","doi":"10.1360/02WW0190","DOIUrl":"https://doi.org/10.1360/02WW0190","url":null,"abstract":"This paper presents a new 3D edge operator based on Legendre orthogonal moments. This operator can be used to extract the edge of 3D object in any window size, with more accurate surface orientation and more precise surface location. It also has full geometry meaning. Process of calculation is considered in the moment based method. We can greatly speed up the computation by calculating out the masks in advance. We integrate this operator into our rendering of medical image data based on ray casting algorithm. Experimental results show that it is an effective 3D edge operator that is more accurate in position and orientation.","PeriodicalId":21584,"journal":{"name":"Science in China Series G: Physics and Astronomy","volume":"59 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90448108","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}
引用次数: 4
Effect of electric field, stress and environment on delayed fracture of a PZT-5 ferroelectric ceramic 电场、应力和环境对PZT-5铁电陶瓷延迟断裂的影响
Science in China Series G: Physics and Astronomy Pub Date : 2005-02-01 DOI: 10.1360/03YW0146
Yi Wang, Yanjing Su, W. Chu, L. Qiao
{"title":"Effect of electric field, stress and environment on delayed fracture of a PZT-5 ferroelectric ceramic","authors":"Yi Wang, Yanjing Su, W. Chu, L. Qiao","doi":"10.1360/03YW0146","DOIUrl":"https://doi.org/10.1360/03YW0146","url":null,"abstract":"The combined effect of electric and mechanical loading on fracture of a PZT-5 ferroelectric ceramic in silicone oil has been investigated using a single edge notched specimen. The results show that the fracture toughness and the threshold stress intensity factor of delayed fracture in silicone oil, i.e. stress corrosion cracking, decrease linearly with the increasing applied electric field, either positive or negative. For the PZT-5 ferroelectric ceramics, delayed fracture in silicone oil under sustained positive or negative field can occur, and the threshold field for delayed fracture under sustained positive or negative field decreases linearly with applied stress intensity factor. The combined effect of electric and mechanical loading on delayed fracture in silicone oil includes field-enhancing delayed fracture under sustained load and stress-enhancing delayed fracture in silicone oil under sustained field.","PeriodicalId":21584,"journal":{"name":"Science in China Series G: Physics and Astronomy","volume":"6 1","pages":"89-100"},"PeriodicalIF":0.0,"publicationDate":"2005-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75262417","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}
引用次数: 2
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信