Millimeter-wave transmission combined with Orbital Angular Momentum(OAM)has the advantage of reducing the loss of beam power and increasing the system capacity.However,to fulfill this advantage,the antennas at the tra...Millimeter-wave transmission combined with Orbital Angular Momentum(OAM)has the advantage of reducing the loss of beam power and increasing the system capacity.However,to fulfill this advantage,the antennas at the transmitter and receiver must be parallel and coaxial;otherwise,the accuracy of mode detection at the receiver can be seriously influenced.In this paper,we design an OAM millimeter-wave communication system for overcoming the above limitation.Specifically,the first contribution is that the power distribution between different OAM modes and the capacity of the system with different mode sets are analytically derived for performance analysis.The second contribution lies in that a novel mode selection scheme is proposed to reduce the total interference between different modes.Numerical results show that system performance is less affected by the offset when the mode set with smaller modes or larger intervals is selected.展开更多
背景:近年来,绝经后骨质疏松症受到社会的广泛关注,随着动物模型研究的逐渐深入,动物模型已然成为现代中医药研究的重要手段以及实验基础,因此了解动物模型的研究现状、热点及发展趋势尤为重要。目的:分析国内外绝经后骨质疏松症动物模...背景:近年来,绝经后骨质疏松症受到社会的广泛关注,随着动物模型研究的逐渐深入,动物模型已然成为现代中医药研究的重要手段以及实验基础,因此了解动物模型的研究现状、热点及发展趋势尤为重要。目的:分析国内外绝经后骨质疏松症动物模型的研究现状、热点及发展趋势,为后续研究提供一定的理论基础及参考依据。方法:以“主题词=绝经后骨质疏松AND主题词=鼠+兔+犬+猪+羊+猴+鱼+实验动物+动物实验”为检索式,对1999-01-01/2023-10-01在中国知网、万方数据库中的文章进行主题词检索;同时以“TS=(Postmenopausal osteoporosis)AND TS=(mouse OR mice OR rat OR rabbit OR dog OR swine OR pig OR sheep OR monkey OR fish or flies OR“laboratory animal”OR“experiment animal”)”为检索式,对1999-01-01/2023-10-01在Web of Science核心合集数据库中的文章进行主题词检索。应用Citespace软件对文献作者、机构、国家、关键词以及文献共被引量进行可视化分析。结果与结论:①分析后筛选中国知网及万方数据库共纳入1238篇文献,Web of Science核心合集数据库共纳入3419篇文献。自1999年来,该领域发文量总体呈上升趋势,研究中心性最高的是美国,发文量最高的是中国,研究中心性最高的机构为美国加利福尼亚大学。②去除与文章主题直接相关的关键词,综合共现频率及中心性,“生物力学”“左归丸”“阿仑膦酸盐”“乳腺癌”“生化指标”处于该研究领域较为核心的地位。③通过文献共被引分析,被引频次前10位的文献中有5篇文献与绝经后骨质疏松症治疗措施与临床疗效有关。④综合关键词与共被引文献分析显示,探究成骨细胞的形成以及骨形成的机制、代谢组学的作用机制、中药复方的治疗、信号通路、甲状旁腺激素治疗及硬骨素抗体治疗等方面是当下的研究热点也是未来的研究趋势。展开更多
This paper presents a novel view of the impact of electron collision off-axis positions on the dynamic properties and relativistic nonlinear Thomson inverse scattering of excited electrons within tightly focused, circ...This paper presents a novel view of the impact of electron collision off-axis positions on the dynamic properties and relativistic nonlinear Thomson inverse scattering of excited electrons within tightly focused, circularly polarized laser pulses of varying intensities. We examine the effects of the transverse ponderomotive force, specifically how the deviation angle and speed of electron motion are affected by the initial off-axis position of the electron and the peak amplitude of the laser pulse. When the laser pulse intensity is low, an increase in the electron's initial off-axis distance results in reduced spatial radiation power, improved collimation, super-continuum phenomena generation, red-shifting of the spectrum's harmonic peak, and significant symmetry in the radiation radial direction. However, in contradiction to conventional understandings,when the laser pulse intensity is relatively high, the properties of the relativistic nonlinear Thomson inverse scattering of the electron deviate from the central axis, changing direction in opposition to the aforementioned effects. After reaching a peak, these properties then shift again, aligning with the previous direction. The complex interplay of these effects suggests a greater nuance and intricacy in the relationship between laser pulse intensity, electron position, and scattering properties than previously thought.展开更多
为解决当前在钢结构建筑信息模型(building information modeling,BIM)与结构分析模型之间进行数据转换时存在的关键技术问题,本文在分析工业基础类(industry foundation classes,IFC)标准表达方法的基础上,以ABAQUS为结构分析平台,开...为解决当前在钢结构建筑信息模型(building information modeling,BIM)与结构分析模型之间进行数据转换时存在的关键技术问题,本文在分析工业基础类(industry foundation classes,IFC)标准表达方法的基础上,以ABAQUS为结构分析平台,开发了钢结构BIM模型数据转换算法,运用C#语言和Xbim工具包,实现了结构构件信息提取、构件空间位置调整和分析数据自动添加,并形成了相应的转换软件;通过钢框架结构实例分析验证了该软件的可靠性和准确性,并将其应用于安阳市游客集散中心的BIM模型转换和结构分析。结果表明,所开发的算法和软件解决了生成的结构分析模型节点不连接和人工添加分析数据工作量大等问题,实现了BIM中的钢结构设计模型或深化设计模型向ABAQUS结构分析模型数据的准确转换。与传统的在ABAQUS中直接建立结构分析模型相比,本文提出的方法能大大提高复杂钢结构的结构分析建模速度和效率。展开更多
基金supported in part by The National Natural Science Foundation of China(62071255,62171232,61771257)The Major Projects of the Natural Science Foundation of the Jiangsu Higher Education Institutions(20KJA510009)+3 种基金The Open Research Fund of Key Lab of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications),Ministry of Education(JZNY201914)The open research fund of National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology,Nanjing University of Posts and Telecommunications(KFJJ20170305)The Research Fund of Nanjing University of Posts and Telecommunications(NY218012)Henan province science and technology research projects High and new technology(No.182102210106).
文摘Millimeter-wave transmission combined with Orbital Angular Momentum(OAM)has the advantage of reducing the loss of beam power and increasing the system capacity.However,to fulfill this advantage,the antennas at the transmitter and receiver must be parallel and coaxial;otherwise,the accuracy of mode detection at the receiver can be seriously influenced.In this paper,we design an OAM millimeter-wave communication system for overcoming the above limitation.Specifically,the first contribution is that the power distribution between different OAM modes and the capacity of the system with different mode sets are analytically derived for performance analysis.The second contribution lies in that a novel mode selection scheme is proposed to reduce the total interference between different modes.Numerical results show that system performance is less affected by the offset when the mode set with smaller modes or larger intervals is selected.
文摘背景:近年来,绝经后骨质疏松症受到社会的广泛关注,随着动物模型研究的逐渐深入,动物模型已然成为现代中医药研究的重要手段以及实验基础,因此了解动物模型的研究现状、热点及发展趋势尤为重要。目的:分析国内外绝经后骨质疏松症动物模型的研究现状、热点及发展趋势,为后续研究提供一定的理论基础及参考依据。方法:以“主题词=绝经后骨质疏松AND主题词=鼠+兔+犬+猪+羊+猴+鱼+实验动物+动物实验”为检索式,对1999-01-01/2023-10-01在中国知网、万方数据库中的文章进行主题词检索;同时以“TS=(Postmenopausal osteoporosis)AND TS=(mouse OR mice OR rat OR rabbit OR dog OR swine OR pig OR sheep OR monkey OR fish or flies OR“laboratory animal”OR“experiment animal”)”为检索式,对1999-01-01/2023-10-01在Web of Science核心合集数据库中的文章进行主题词检索。应用Citespace软件对文献作者、机构、国家、关键词以及文献共被引量进行可视化分析。结果与结论:①分析后筛选中国知网及万方数据库共纳入1238篇文献,Web of Science核心合集数据库共纳入3419篇文献。自1999年来,该领域发文量总体呈上升趋势,研究中心性最高的是美国,发文量最高的是中国,研究中心性最高的机构为美国加利福尼亚大学。②去除与文章主题直接相关的关键词,综合共现频率及中心性,“生物力学”“左归丸”“阿仑膦酸盐”“乳腺癌”“生化指标”处于该研究领域较为核心的地位。③通过文献共被引分析,被引频次前10位的文献中有5篇文献与绝经后骨质疏松症治疗措施与临床疗效有关。④综合关键词与共被引文献分析显示,探究成骨细胞的形成以及骨形成的机制、代谢组学的作用机制、中药复方的治疗、信号通路、甲状旁腺激素治疗及硬骨素抗体治疗等方面是当下的研究热点也是未来的研究趋势。
基金Project supported by the National Natural Science Foundation of China (Grant Nos.10947170/A05 and 11104291)the Natural Science Fund for Colleges and Universities in Jiangsu Province (Grant No.10KJB140006)+2 种基金the Natural Sciences Foundation of Shanghai (Grant No.11ZR1441300)the Natural Science Foundation of Nanjing University of Posts and Telecommunications (Grant No.NY221098)the Jiangsu Qing Lan Project for their sponsorship。
文摘This paper presents a novel view of the impact of electron collision off-axis positions on the dynamic properties and relativistic nonlinear Thomson inverse scattering of excited electrons within tightly focused, circularly polarized laser pulses of varying intensities. We examine the effects of the transverse ponderomotive force, specifically how the deviation angle and speed of electron motion are affected by the initial off-axis position of the electron and the peak amplitude of the laser pulse. When the laser pulse intensity is low, an increase in the electron's initial off-axis distance results in reduced spatial radiation power, improved collimation, super-continuum phenomena generation, red-shifting of the spectrum's harmonic peak, and significant symmetry in the radiation radial direction. However, in contradiction to conventional understandings,when the laser pulse intensity is relatively high, the properties of the relativistic nonlinear Thomson inverse scattering of the electron deviate from the central axis, changing direction in opposition to the aforementioned effects. After reaching a peak, these properties then shift again, aligning with the previous direction. The complex interplay of these effects suggests a greater nuance and intricacy in the relationship between laser pulse intensity, electron position, and scattering properties than previously thought.
文摘为解决当前在钢结构建筑信息模型(building information modeling,BIM)与结构分析模型之间进行数据转换时存在的关键技术问题,本文在分析工业基础类(industry foundation classes,IFC)标准表达方法的基础上,以ABAQUS为结构分析平台,开发了钢结构BIM模型数据转换算法,运用C#语言和Xbim工具包,实现了结构构件信息提取、构件空间位置调整和分析数据自动添加,并形成了相应的转换软件;通过钢框架结构实例分析验证了该软件的可靠性和准确性,并将其应用于安阳市游客集散中心的BIM模型转换和结构分析。结果表明,所开发的算法和软件解决了生成的结构分析模型节点不连接和人工添加分析数据工作量大等问题,实现了BIM中的钢结构设计模型或深化设计模型向ABAQUS结构分析模型数据的准确转换。与传统的在ABAQUS中直接建立结构分析模型相比,本文提出的方法能大大提高复杂钢结构的结构分析建模速度和效率。
