Halo structure is added to sub-100 nm surrounding-gate metal-oxide-semiconductor fieldeffect-transistors （MOS- FETs） to suppress short channel effect. This paper develops the analytical surface potential and thresho...Halo structure is added to sub-100 nm surrounding-gate metal-oxide-semiconductor fieldeffect-transistors （MOS- FETs） to suppress short channel effect. This paper develops the analytical surface potential and threshold voltage models based on the solution of Poisson＇s equation in fully depleted condition for symmetric halo-doped cylindrical surrounding gate MOSFETs. The performance of the halo-doped device is studied and the validity of the analytical models is verified by comparing the analytical results with the simulated data by three dimensional numerical device simulator Davinci. It shows that the halo doping profile exhibits better performance in suppressing threshold voltage roll-off and drain-induced barrier lowering, and increasing carrier transport efficiency. The derived analytical models are in good agreement with Davinci.展开更多
针对未来地月L2点Halo轨道空间站长期停泊任务,研究了高精度模型下Halo轨道设计方法。首先,详细推导了圆型限制性三体问题(Circular Restricted Three Body Problem,CR3BP)质心会合坐标系与高精度模型地心J2000坐标系之间的转换关系,并...针对未来地月L2点Halo轨道空间站长期停泊任务,研究了高精度模型下Halo轨道设计方法。首先,详细推导了圆型限制性三体问题(Circular Restricted Three Body Problem,CR3BP)质心会合坐标系与高精度模型地心J2000坐标系之间的转换关系,并在此基础上,将CR3BP下的闭合Halo轨道转换到地心J2000坐标系得到了高精度模型下Halo轨道迭代初值。其次,采用序列二次规划(Sequence Quadratic Program,SQP)构造多层迭代格式,在高精度模型下对初值进行逐层修正。最后,通过仿真测试,验证了该方法的可行性与有效性。该研究结果可为未来平动点任务标称轨道设计方案的制定提供参考。展开更多
Different fused-core stationary phase chemistries（C18,Amide,Phenyl-hexyl and Peptide ES-C18） were used for the analysis of 21 structurally representative model peptides.In addition,the effects of the mobile phase co...Different fused-core stationary phase chemistries（C18,Amide,Phenyl-hexyl and Peptide ES-C18） were used for the analysis of 21 structurally representative model peptides.In addition,the effects of the mobile phase composition（ACN or MeOH as organic modifier;formic acid or acetic acid,as acidifying component） on the column selectivity,peak shape and overall chromatographic performance were evaluated.The RP-amide column,combined with a formic acid-acetonitrile based gradient system,performed as best.A peptide reversed-phase retention model is proposed,consisting of 5 variables：log SumAA,log Sv,clog P,log nHDon and log nHAcc.Quantitative structure-retention relationship（QSRR） models were constructed for 16 different chromatographic systems.The accuracy of this peptide retention model was demonstrated by the comparison between predicted and experimentally obtained retention times,explaining on average 86% of the variability.Moreover,using an external set of 5 validation peptides,the predictive power of the model was also demonstrated.This peptide retention model includes the novel in-silico calculated amino acid descriptor,AA,which was calculated from log P,3D-MoRSE,RDF and WHIM descriptors.展开更多
A self-similar-structure shell modct （SSM） is proposed to extend the conven-tional shell model （SM） calculation to study halo nuclei.The exotic structures of <sup>11</sup>Liand <sup>6</sup>...A self-similar-structure shell modct （SSM） is proposed to extend the conven-tional shell model （SM） calculation to study halo nuclei.The exotic structures of <sup>11</sup>Liand <sup>6</sup>He nuclei are reproduced by means of SSM.The neutron halo of <sup>11</sup>Li comes fromthe spin-orbit term and the thick neutron skin of <sup>6</sup>He arises from the different quantumnumbers N<sub>n</sub> and N<sub>p</sub>（N=2n+1） in SSM.展开更多
This paper makes some qualitative and quantitative analyses about halo formation rules of some mirror nuclei with the relativistic mean-field （RMF） theory and the Woods Saxon mean-field model. By analysing two oppos...This paper makes some qualitative and quantitative analyses about halo formation rules of some mirror nuclei with the relativistic mean-field （RMF） theory and the Woods Saxon mean-field model. By analysing two opposite effects of Coulomb interaction on the proton halo formation, it finds that the energy level shift has a larger contribution than that of the Coulomb barrier when the mass number A is small, the hindrance of the Coulomb barrier becomes more obvious with the increase of the mass number A, and the overall effect of the Coulomb interaction almost disappears when A ≈ 39 as its two effects counteract with each other.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No 10771168)the State Key Development Program for Basic Research of China (Grant No 2005CB321701)Shaanxi Natural Science Foundation Program of China(Grant No SJ08-ZT13)
文摘Halo structure is added to sub-100 nm surrounding-gate metal-oxide-semiconductor fieldeffect-transistors （MOS- FETs） to suppress short channel effect. This paper develops the analytical surface potential and threshold voltage models based on the solution of Poisson＇s equation in fully depleted condition for symmetric halo-doped cylindrical surrounding gate MOSFETs. The performance of the halo-doped device is studied and the validity of the analytical models is verified by comparing the analytical results with the simulated data by three dimensional numerical device simulator Davinci. It shows that the halo doping profile exhibits better performance in suppressing threshold voltage roll-off and drain-induced barrier lowering, and increasing carrier transport efficiency. The derived analytical models are in good agreement with Davinci.
文摘针对未来地月L2点Halo轨道空间站长期停泊任务,研究了高精度模型下Halo轨道设计方法。首先,详细推导了圆型限制性三体问题(Circular Restricted Three Body Problem,CR3BP)质心会合坐标系与高精度模型地心J2000坐标系之间的转换关系,并在此基础上,将CR3BP下的闭合Halo轨道转换到地心J2000坐标系得到了高精度模型下Halo轨道迭代初值。其次,采用序列二次规划(Sequence Quadratic Program,SQP)构造多层迭代格式,在高精度模型下对初值进行逐层修正。最后,通过仿真测试,验证了该方法的可行性与有效性。该研究结果可为未来平动点任务标称轨道设计方案的制定提供参考。
基金funded by a Ph.D.grant of "Institute for the Promotion of Innovation through Science and Technology in Flanders(IWT-Vlaanderen)"(No.091241 for MD and 073402 for SVD)the Special Research Fund of the Ghent University (Grant no.BOF 01J22510 for EW and BOF 01D38811 for SS)
文摘Different fused-core stationary phase chemistries（C18,Amide,Phenyl-hexyl and Peptide ES-C18） were used for the analysis of 21 structurally representative model peptides.In addition,the effects of the mobile phase composition（ACN or MeOH as organic modifier;formic acid or acetic acid,as acidifying component） on the column selectivity,peak shape and overall chromatographic performance were evaluated.The RP-amide column,combined with a formic acid-acetonitrile based gradient system,performed as best.A peptide reversed-phase retention model is proposed,consisting of 5 variables：log SumAA,log Sv,clog P,log nHDon and log nHAcc.Quantitative structure-retention relationship（QSRR） models were constructed for 16 different chromatographic systems.The accuracy of this peptide retention model was demonstrated by the comparison between predicted and experimentally obtained retention times,explaining on average 86% of the variability.Moreover,using an external set of 5 validation peptides,the predictive power of the model was also demonstrated.This peptide retention model includes the novel in-silico calculated amino acid descriptor,AA,which was calculated from log P,3D-MoRSE,RDF and WHIM descriptors.
基金The project supported financially by LWTZ-1298 of Chinese Academy of Sciences and the National Natural Science Foundation of China.
文摘A self-similar-structure shell modct （SSM） is proposed to extend the conven-tional shell model （SM） calculation to study halo nuclei.The exotic structures of <sup>11</sup>Liand <sup>6</sup>He nuclei are reproduced by means of SSM.The neutron halo of <sup>11</sup>Li comes fromthe spin-orbit term and the thick neutron skin of <sup>6</sup>He arises from the different quantumnumbers N<sub>n</sub> and N<sub>p</sub>（N=2n+1） in SSM.
基金Project supported by the National Natural Science Foundation of China (Grant No 10435020)the Science Foundation of the Beijing Education Committee (Grant No XK100270454)
文摘This paper makes some qualitative and quantitative analyses about halo formation rules of some mirror nuclei with the relativistic mean-field （RMF） theory and the Woods Saxon mean-field model. By analysing two opposite effects of Coulomb interaction on the proton halo formation, it finds that the energy level shift has a larger contribution than that of the Coulomb barrier when the mass number A is small, the hindrance of the Coulomb barrier becomes more obvious with the increase of the mass number A, and the overall effect of the Coulomb interaction almost disappears when A ≈ 39 as its two effects counteract with each other.
