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Parameter transferability across spatial resolutions in urban hydrological modelling:a case study in Beijing,China
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作者 Xiaoshu HOU Lei CHEN +2 位作者 Xiang LIU Miao LI Zhenyao SHEN 《地球科学前沿:英文版》 SCIE CAS CSCD 2019年第1期18-32,共15页
This study examined the influence of spatial resolution on model parameterization,output,and the parameter transferability between different resolutions using the Storm Water Management Model.High-resolution models,in... This study examined the influence of spatial resolution on model parameterization,output,and the parameter transferability between different resolutions using the Storm Water Management Model.High-resolution models,in which most subcatchrnents were homogeneous,and high-resolution-based low-resolution models (in 3 scenarios)were constructed for a highly urbanized catchment in Beijing.The results indicated that the parameterization and simulation results were affected by both spatial resolution and rainfall characteristics.The simulated peak inflow and total runoff volume were sensitive to the spatial resolution,but did not show a consistent tendency.High-resolution models performed very well for both calibration and validation events in terms of three indexes:1)the Nash-Sutcliffe efficiency, 2)the peak flow error,and 3)the volume error;indication of the advantage of using these models.The parameters obtained from high-resolution models could be directly used in the low-resolution models and performed well in the simulation of heavy rain and torrential rain and in the study area where sub-area routing is insignificant.Alternatively,sub-area routing should be considered and estimated approximately.The successful scale conversion from high spatial resolution to low spatial resolution is of great significance for the hydrological simulation of ungauged large areas. 展开更多
关键词 SWMM high RESOLUTION low RESOLUTION RAINFALL characteristics PARAMETER transferability
Pedestrian Height Estimation and 3D Reconstruction Using Pixel-resolution Mapping Method Without Special Patterns
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作者 Bing-Xing Wu Suat Utku Ay Ahmed Abdel-Rahim 《国际自动化与计算杂志:英文版》 EI CSCD 2019年第4期449-461,共13页
Extracting the three-dimensional (3D) information including location and height of a pedestrian is important for vision-based intelligent traffic monitoring systems. This paper tackles the relationship between pixels... Extracting the three-dimensional (3D) information including location and height of a pedestrian is important for vision-based intelligent traffic monitoring systems. This paper tackles the relationship between pixels′ actual size and pixels′ spatial resolution through a new method named pixel-resolution mapping (P-RM). The proposed P-RM method derives the equations for pixels′ spatial resolutions (XY-direction) and object′s height (Z-direction) in the real world, while introducing new tilt angle and mounting height calibration methods that do not require special calibration patterns placed in the real world. Both controlled laboratory and actual world experiments were performed and reported. The tests on 3D mensuration using proposed P-RM method showed overall better than 98.7% accuracy in laboratory environments and better than 96% accuracy in real world pedestrian height estimations. The 3D reconstructed images for measured points were also determined with the proposed P-RM method which shows that the proposed method provides a general algorithm for 3D information extraction. 展开更多
关键词 TRAFFIC monitoring application spatial RESOLUTION pixel-resolution mapping (P-RM) method 3D information PEDESTRIAN HEIGHT estimation
Degradation of duloxetine: Identification of transformation products by UHPLC-ESI(+)-HRMS/MS,in silico toxicity and wastewater analysis
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作者 Rodrigo A. Osawa Ana P. Carvalho +2 位作者 Olinda C. Monteiro M. Conceicao Oliveira M. Helena Florencio 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第8期113-123,共11页
Duloxetine(DUL), an antidepressant drug, has been detected in surface water and wastewater effluents, however, there is little information on the formation of its transformation products(TPs). In this work, hydrolysis... Duloxetine(DUL), an antidepressant drug, has been detected in surface water and wastewater effluents, however, there is little information on the formation of its transformation products(TPs). In this work, hydrolysis, photodegradation(UV irradiation) and chlorination experiments were performed on spiked distillated water, under controlled experimental conditions to simulate abiotic processes that can occur in the environment and wastewater treatment plants(WWTPs). Eleven TPs, nine from reaction with UV light and two from chlorine contact, were formed and detected by ultra-high performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry, and nine of them had their chemical structures elucidated upon analyses of their fragmentation patterns in MS/MS spectra. The formation and degradation of the TPs were observed. The parent compound was completely degraded after30 min in photodegradation and after 24 hr in chlorination. Almost all TPs were completely degraded in the experiments. The ecotoxicity and mutagenicity of the TPs were predicted based on several in silico models and it was found that a few of these products presented more ecotoxicity than DUL itself and six TPs showed positive mutagenicity. Finally, wastewater samples were analyzed and DUL and one TP, possibly formed by chlorination process, were detected in the effluent, which showed that WWTP not only did not remove DUL, but also formed a TP. 展开更多
关键词 High resolution mass SPECTROMETRY DULOXETINE DEGRADATION processes Transformation products WASTEWATER analysis In silico TOXICITY
Separation, Quantification and Structural Study of (+)-Catechin and (-)-Epicatechin by Ion Mobility Mass Spectrometry Combined with Theoretical Algorithms
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作者 Xinyu Bian Bing Zhao +4 位作者 Bo Pang Zhong Zheng Shu Liu Zhiqiang Liu Fengrui Song 《中国化学:英文版》 SCIE CAS CSCD 2019年第6期581-587,共7页
Two catechin epimers and their non-covalent complexes with γ-cyclodextrin were studied by using ion mobility coupled with mass spectrometry (IM-MS). Rapid separation of complexes was achieved with the peak-to-peak re... Two catechin epimers and their non-covalent complexes with γ-cyclodextrin were studied by using ion mobility coupled with mass spectrometry (IM-MS). Rapid separation of complexes was achieved with the peak-to-peak resolution reaching 0.86 after optimization of IM condition. Collision cross section (CCS) was measured to explore the structural difference of complexes. A gap of 11.75 A^2 between two complexes was found. Molecular modeling and theoretical CCS calculation were adopted to explain the measurement results. Two binding ways of both complexes were found and the calculated CCS corresponds accurately to the measured CCS. Quantification of catechins in mixtures was performed and the relative error was less than 15%, indicating the effectiveness of quantification by IM-MS. 展开更多
关键词 IM-MS CATECHIN cycodextrin THEORETICAL modeling COLLISION cross section CHIRAL resolution
软件缺陷报告严重性属性分析 预览
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作者 刘文杰 江贺 《计算机工程与应用》 CSCD 北大核心 2019年第14期48-53,208共7页
软件缺陷报告的严重性对缺陷的解决具有关键作用。随着软件规模的不断扩大,使用开源的软件缺陷跟踪系统成为海量缺陷信息数据的主要处理方法。分析缺陷报告严重性在数据仓库中的作用,是处理软件缺陷的重要内容。通过对Bugzilla缺陷跟踪... 软件缺陷报告的严重性对缺陷的解决具有关键作用。随着软件规模的不断扩大,使用开源的软件缺陷跟踪系统成为海量缺陷信息数据的主要处理方法。分析缺陷报告严重性在数据仓库中的作用,是处理软件缺陷的重要内容。通过对Bugzilla缺陷跟踪系统数据的研究和分析,发现不同项目的属性特征差异较大,同时在修复率、解决时长、开发者、组件等属性上的统计特征具有一致性。对Mozilla项目和Eclipse项目的数据进行系统分析,并根据不同组件和项目中严重性程度分布情况,认为软件缺陷报告严重性程度的提升会导致缺陷修复率的提高,同时严重性程度为normal级别的缺陷解决时长最短,开发者持有缺陷的数量越高其修复率越低。 展开更多
关键词 计算机应用技术 开源软件 缺陷报告 严重等级 解决方案 修复率
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The Strategy of Third-Party Mediation Based on the Option Prioritization in the Graph Model
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作者 Zhenggao Wu Haiyan Xu Ginger Y. Ke 《系统科学与系统工程学报:英文版》 SCIE EI CSCD 2019年第4期399-414,共16页
The resolution of real-world conflicts is often supported by third-party intervention (i.e., media? tion). This paper proposes a possible mediation support in the form of a reverse optimization procedure under the fra... The resolution of real-world conflicts is often supported by third-party intervention (i.e., media? tion). This paper proposes a possible mediation support in the form of a reverse optimization procedure under the framework of the Graph Model for Conflict Resolution (GMCR). The approach computes minimal priority adjustments of preference statements that are necessary to achieve a desired agreement. A mathematical model, based on the matrix form of GMCR, is developed to analyze this third-party mediation problem. Thereby;this study makes a first attempt to obtain option-based mediation strategies, which add comprehensiveness to the traditional state-based strategies, yet are easier to understand and hence more acceptable to the conflict participants. To illustrate the practicality;the proposed procedure is applied to a medical dispute between a patient and a hospital, with the aim to suggest changes in the ordering of preference statements that lead to a desired outcome. 展开更多
关键词 Graph Model for CONFLICT RESOLUTION third party MEDIATION OPTION PRIORITIZATION MINIMAL adjustment
Strategic Analysis of a Regulatory Conflict Using Dempster-Shafer Theory and AHP for Preference Elicitation
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作者 Maisa M. Silva Keith W. Hipel +1 位作者 D. Marc Kilgour Ana Paula C. S. Costa 《系统科学与系统工程学报:英文版》 SCIE EI CSCD 2019年第4期415-433,共19页
Dempster-Shafer Theory (DST) and the Analytic Hierarchy Process (AHP) are integrated in order to elicit preference information from experts regarding decision makers (DMs) involved in a regulatory conflict. More preci... Dempster-Shafer Theory (DST) and the Analytic Hierarchy Process (AHP) are integrated in order to elicit preference information from experts regarding decision makers (DMs) involved in a regulatory conflict. More precisely, DST is used for combining expert knowledge regarding preferences of a specific DM (the regulatory body), and AHP is employed for ranking feasible states in the conflict for this same DM. In order to illustrate how this preference elicitation proposal can be conveniently implemented in practice within the Graph Model for Conflict Resolution (GMCR), it is applied to a real construction dispute located in the city of Ipojuca, Brazil. The conflict is modeled with three DMs: support, opposition, and the regulatory body. Results show that the new preference methodology possesses many inherent advantages including high flexibility the ability to capture uncertainty or even ignorance about preferences, the possibility of combining expert knowledge with respect to missing preferences, and a substantial reduction in the number of pairwise comparisons of states required to express preference information. 展开更多
关键词 REGULATORY CONFLICT graph model for CONFLICT resolution ABSENCE of PREFERENCE information DST-AHP
The Strategy of Escalation and Negotiation: The Iran Nuclear Dispute
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作者 Tobias W. Langenegger Keith W. Hipel 《系统科学与系统工程学报:英文版》 SCIE EI CSCD 2019年第4期434-448,共15页
The strategic decisions and resulting consequences surrounding the conflict between the United States of America (US) and Iran regarding the Iranian nuclear program are formally investigated using a flexible decision ... The strategic decisions and resulting consequences surrounding the conflict between the United States of America (US) and Iran regarding the Iranian nuclear program are formally investigated using a flexible decision methodology called the Graph Model for Conflict Resolution (GMCR). This highly controversial dispute caught the world's attention as concerns were growing that Iran would reach a position where 辻 would be able to build nuclear weapons, thereby posing a risk to world security. While Iran insisted on its rights for the peaceful use of nuclear technology;the international community;led by the US, tried to discourage the nuclear activities of Iran to ensure its obligations to the non-proliferation of nuclear weapons. This led to an escalation of tension on both sides, with an extension of the nuclear program by Iran and an increase in sanctions by the US, before it was possible to arrive at a negotiated agreement. As demonstrated in this paper, a systematic GMCR investigation provides valuable strategic insights into this important conflict. Further, it illustrates ways in which the conflict could have evolved, as well as mechanisms for stopping an escalation like this in the future. 展开更多
关键词 NEGOTIATION Graph Model for CONFLICT RESOLUTION Iran US NUCLEAR security economic sanctions
山东省大学生感染艾滋病的困境、原因及化解对策初探 预览
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作者 李艳霞 《中国卫生事业管理》 北大核心 2019年第5期393-396,共4页
目的:寻求化解山东省大学生感染艾滋病困境的对策。方法:采用实证研究、文献研究和案例研究的方法对山东省大学生感染艾滋病的困境、原因和化解措施深入探讨。结果:山东省大学生感染艾滋病困境的原因集中体现为内部和外部两对矛盾,艾滋... 目的:寻求化解山东省大学生感染艾滋病困境的对策。方法:采用实证研究、文献研究和案例研究的方法对山东省大学生感染艾滋病的困境、原因和化解措施深入探讨。结果:山东省大学生感染艾滋病困境的原因集中体现为内部和外部两对矛盾,艾滋病相关知识不足与观念开放和性教育的滞后与性解放的社会观念,应当关注对大学生的家庭教育、强化其学校教育、深化社会教育,以最终健全大学生的性教育和艾滋病防治教育。结论:化解山东省大学生感染艾滋病的困境需要完善家庭、学校、社会对大学生的多维、连续、协调的艾滋病防治教育和性教育。 展开更多
关键词 大学生 感染 艾滋病 困境 化解
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结构光照明的自干涉数字全息层析成像
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作者 宋舒杰 万玉红 +1 位作者 韩影 满天龙 《中国激光》 EI CAS CSCD 北大核心 2019年第5期390-396,共7页
发展了一种采用结构光照明提高自干涉数字全息成像系统轴向分辨率的方法,理论分析了结构光照明自干涉数字全息层析成像的原理,采用数值模拟和实验研究了结构光空间频率和样品轴向间距对系统层析成像特性的影响,给出了结构光照明模式下... 发展了一种采用结构光照明提高自干涉数字全息成像系统轴向分辨率的方法,理论分析了结构光照明自干涉数字全息层析成像的原理,采用数值模拟和实验研究了结构光空间频率和样品轴向间距对系统层析成像特性的影响,给出了结构光照明模式下自干涉数字全息成像的结果。研究结果表明:结构光照明的自干涉数字全息系统层析成像能力得到了显著提升。 展开更多
关键词 全息 自干涉 结构光照明 层析成像 分辨率
基于MATLAB的无线电信号功率谱仿真与分析 预览
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作者 肖军 刘洲洲 《微型电脑应用》 2019年第4期32-34,共3页
用Matlab仿真对无线电信号功率谱进行分析。通过经典谱估计的平均周期图法仿真分析和现代功率谱估计之最大熵谱估计法仿真分析比较,发现平均周期图法分析的功率谱主瓣变宽,频率分辨率下降,谱线起伏更大;最大熵谱估计法分析的功率谱,解... 用Matlab仿真对无线电信号功率谱进行分析。通过经典谱估计的平均周期图法仿真分析和现代功率谱估计之最大熵谱估计法仿真分析比较,发现平均周期图法分析的功率谱主瓣变宽,频率分辨率下降,谱线起伏更大;最大熵谱估计法分析的功率谱,解决了旁瓣泄露问题。最终得出了选择合适的模型阶数p值,可以得到最佳效果。 展开更多
关键词 MATLAB 功率谱 无线电 分辨率
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乡村治理困境的生成与消解:基于资源错配的视角 预览
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作者 陈鹏 《宁夏党校学报》 2019年第3期93-100,共8页
乡村振兴是党的十九大确立的重大战略,实现乡村有效治理是乡村振兴战略实施的内在要求。当前,我国乡村治理在取得巨大成就的同时,由于乡镇政权的权责设定、资源配置、基层工作人员的激励与约束机制失衡等原因,致使乡镇政府在乡村治理中... 乡村振兴是党的十九大确立的重大战略,实现乡村有效治理是乡村振兴战略实施的内在要求。当前,我国乡村治理在取得巨大成就的同时,由于乡镇政权的权责设定、资源配置、基层工作人员的激励与约束机制失衡等原因,致使乡镇政府在乡村治理中面临权力有限与责任无限、治理资源有限与群众需求无限、治理能力有限与治理风险无限的张力以及治理资源投入增加与基层政府公信力下降、硬治理强化与软治理不足的结构性矛盾凸显等困境。因此,需要推动乡村治理资源从错配向适配转变,从变革乡村治理思维、增强乡镇政府权限、丰富基层治理资源、完善乡村治理手段、激发基层工作人员积极性等方面施策,以实现消解乡村治理困境和重塑乡村治理格局的目标。 展开更多
关键词 乡村治理 困境 消解 资源错配
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双丝型及平板孔型像质计在铸造铝合金车轮检测中的应用 预览
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作者 张继勋 贾利群 《铸造工程》 2019年第1期29-30,共2页
灵敏度、分辨率是评定X射线检测结果有效性的基本指标。但是,要得到较好的图像质量,仅靠灵敏度、分辨率两个指标来衡量还不够。介绍了应用于铸造铝合金车轮的双丝型及孔型像质计的制作与选用,以及测定方法。
关键词 灵敏度 分辨率 双丝型 平板孔型
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Classifying Metarational Stabilities in Conflicts
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作者 Amanda Garcia Keith W.Hipel Amer Obeidi 《系统科学与系统工程学报:英文版》 SCIE EI CSCD 2019年第3期265-284,共20页
New solution concepts for n-decision maker conflicts based on generalized metarationalities for modelling possible human behaviour under conflict are proposed.A classification of these solution concepts,also called st... New solution concepts for n-decision maker conflicts based on generalized metarationalities for modelling possible human behaviour under conflict are proposed.A classification of these solution concepts,also called stability definitions,is presented both to simplify understanding and to illustrate important differences among different stability regimes.The relationships among solution concepts are explored and new,more specific results are obtained in the comparison among existing stability concepts and the newly proposed ones.An informative example is used to demonstrate the applicability and insights of these solution concepts. 展开更多
关键词 GRAPH model for CONFLICT RESOLUTION generalized metarationalities stability CRITERIA DECISIONMAKING
EM算法的参数分辨率 预览
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作者 鲁纳纳 余旌胡 《数学物理学报:A辑》 CSCD 北大核心 2019年第3期638-648,共11页
参数分辨率是在给定噪声情况下,衡量两个相近信号能否区分开的一个标准,为敏感参数、有效精度以及准确度的衡量提供了评估的"尺子".该文以EM算法为基础,结合Fisher线性判别准则的思想,给出EM算法参数分辨率的定义,并以两正态... 参数分辨率是在给定噪声情况下,衡量两个相近信号能否区分开的一个标准,为敏感参数、有效精度以及准确度的衡量提供了评估的"尺子".该文以EM算法为基础,结合Fisher线性判别准则的思想,给出EM算法参数分辨率的定义,并以两正态混合模型为例进行验证.实验表明两个方差为0.1的正态分布其均值距离大于0.206时,EM算法在90%的置信度下可以区分这两个分布,通过构建实验结果和理论推导之间的联系,得到不同置信度下的比例因子图.参数分辨率的提出,为准确度的衡量提供一个定量指标,也为相近信号的区分提供新的解决方案. 展开更多
关键词 EM算法 分辨率 判别准则 变异系数
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面向非线性矛盾目标的微夹持系统参数优化 预览
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作者 张彦斐 贾国朋 +1 位作者 宫金良 王志文 《工程科学与技术》 EI CAS CSCD 北大核心 2019年第4期185-191,共7页
分辨率和最大输出位移是微定位系统互相矛盾的两个关键性能指标,传统以柔度为目标的结构优化设计不能满足系统的这些性能要求。因此,作者建立了综合考虑两者的优化设计模型,并针对该模型含非线性矛盾目标的特点,提出了相应的求解方法。... 分辨率和最大输出位移是微定位系统互相矛盾的两个关键性能指标,传统以柔度为目标的结构优化设计不能满足系统的这些性能要求。因此,作者建立了综合考虑两者的优化设计模型,并针对该模型含非线性矛盾目标的特点,提出了相应的求解方法。首先,选取对系统性能影响较大的参数作为优化变量,根据各变量间的相互制约关系及设计要求建立约束条件;然后,建立只含优化变量的最大输出位移和分辨率的参数表达式,分别作为目标函数和约束条件函数。最后,采用综合分支定界法、内点法和外点法的合成算法用于求解该类优化模型。该合成算法以应用内点法获得的优化模型的任一可行解为搜索起点,并根据外点法的求解结果,应用分支定界法逐渐缩小最优解的搜索范围,最终求得最优解。将该方法应用于一种微夹持系统,对求解结果分析可得,在分辨率要求的不同取值范围内,分辨率要求对最大输出位移的约束作用的强度是不同的。该综合方法直接考虑系统矛盾目标变量,进行微定位系统参数优化,实现了全局优化。 展开更多
关键词 分辨率 最大输出位移 微夹持系统 参数优化 优化算法
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油井电磁全息成像精度和分辨率初探
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作者 张阔 吴锡令 +1 位作者 闫景富 蔡家铁 《地球物理学进展》 CSCD 北大核心 2019年第1期251-256,共6页
提出一种成像精度和分辨率探究思路,考察油井内气—水两相流动下的电磁全息测量适用性.以典型的泡状流为研究对象,检验实验测量与数值模拟结果的吻合程度.在不同半径的居中气泡和不同偏心程度的小气泡等极端情况下,利用测量数据进行电... 提出一种成像精度和分辨率探究思路,考察油井内气—水两相流动下的电磁全息测量适用性.以典型的泡状流为研究对象,检验实验测量与数值模拟结果的吻合程度.在不同半径的居中气泡和不同偏心程度的小气泡等极端情况下,利用测量数据进行电磁全息成像,通过占空比考察成像精度和分辨率.结果表明,当气泡居中时,气泡半径不小于管道半径的1/6时方可初步分辨,不小于1/4时方可准确分辨;当气泡半径为管道半径的1/12时,偏心量不小于管道半径的1/2时方可初步分辨,不小于2/3时方可准确分辨.当气泡半径或偏心程度更大时,分辨率将好于上述极端情况. 展开更多
关键词 油井两相流动 电磁全息成像 泡状流 偏心程度 分辨率
Essay on Indifference:Affect and Thinking From Spinoza to Freud and Deleuze 预览
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作者 Szymon Wróbel 《哲学研究:英文版》 2019年第2期65-73,共9页
In this paper,the author is questioning the very concept of“indifference of thinking”.The author also asks:In what sense,thinking leads to“overall indifference”?What,indeed,is indifference?Reading carefully,the ph... In this paper,the author is questioning the very concept of“indifference of thinking”.The author also asks:In what sense,thinking leads to“overall indifference”?What,indeed,is indifference?Reading carefully,the philosophical texts on affects,mainly Spinoza,Freud,Bergson,and Deleuze,author argues that indifference is not a kind of non-affection,beside-affection,post-affection,but rather,it is a trace of affect―just as cinders are remnants of fire.Indifference is neither abnegation which is a kind of statement that we could not care less.On the contrary,it is in indifference where we find profound commitment to bringing back things of this world to their natural position. 展开更多
关键词 active state conatus contrary affect death drive FACADE formations general INDIFFERENCE MADNESS resolution sustainability
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基于ARTS的傅里叶红外高光谱计算模型研究及其影响因素分析 预览
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作者 王琦 刘磊 +2 位作者 高太长 胡帅 曾庆伟 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2019年第6期1711-1716,共6页
在基于红外高光谱辐射数据进行大气遥感方面的研究中,准确模拟红外高光谱数据是很重要的一步。分析了红外高光谱辐射仪的测量原理,建立了基于Atmospheric Radiation Transfer Simulator(ARTS)的考虑仪器干涉图截断与离散化处理过程的正... 在基于红外高光谱辐射数据进行大气遥感方面的研究中,准确模拟红外高光谱数据是很重要的一步。分析了红外高光谱辐射仪的测量原理,建立了基于Atmospheric Radiation Transfer Simulator(ARTS)的考虑仪器干涉图截断与离散化处理过程的正向模型。在该正向模型中,首先采用高光谱辐射传输模式ARTS模拟得到离散化理想光谱,通过逆傅里叶变换将理想光谱转化为干涉图,对干涉图加窗截断处理,模拟仪器响应函数对干涉图的影响,最后采用傅里叶变换得到仪器测量光谱。在这一过程中,窗口函数的选择取决于仪器的干涉图截断方式。未经过切趾处理的仪器,其对应的窗口函数为矩形窗口;经过切趾函数处理,可以减少干涉图截断造成的能量泄露现象。逆傅里叶变换与傅里叶变换过程中必须满足Nyquist采样定律。基于已建立的正向模型,模拟了Atmospheric Emitted Radiance Interferometer(AERI)在Southern Great Plains(SGP)站点的108组晴空辐射数据,并与AERI的实测结果进行比较分析,结果发现理想光谱与AERI实测光谱在吸收线上差异较大,最大残差达到35 mW·sr^-1·m^-2·(cm^-1)^-1(简称RU)以上,增加干涉图截断过程后,模拟光谱与实测光谱的最大残差减小到10 RU以内。截断过程的增加对模拟光谱的精度有明显提高,尤其在吸收线上,模拟光谱明显被平滑,模拟精度显著提高。进一步分析六种常用窗口函数截断处理的结果与AERI实测数据的残差,结果发现,模拟过程中选择窗口函数为矩形窗口时,模拟光谱与AERI实测数据残差最小,基本可以约束在5 RU以内,确定了AERI的干涉图截断方式可以近似看作矩形截断。另外,在理想光谱转换为干涉图的过程中,理想光谱分辨率的选择决定了干涉图信息的采样率以及ARTS的计算效率,因此综合考虑模型计算精度和模型计算效率,确定最佳的理想光谱分辨率对于提高模型计算效� 展开更多
关键词 辐射传输模式 正向模型 切趾函数 分辨率
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面向扑翼微飞行器的扭矩传感器研究
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作者 周靖 张卫平 +3 位作者 邹阳 王晨阳 孟冉 靖霄 《半导体光电》 CAS 北大核心 2019年第3期355-359,共5页
由于仿昆虫扑翼微飞行器需要在小范围内传输扭矩,且扭矩数值较小,一般的扭矩传感器或力传感器在其动态范围内均难以达到测量精度的要求。为了解决这一问题,提出了一种新型单轴扭矩传感器的设计方案,并完成了实际的制造和测试。该扭矩传... 由于仿昆虫扑翼微飞行器需要在小范围内传输扭矩,且扭矩数值较小,一般的扭矩传感器或力传感器在其动态范围内均难以达到测量精度的要求。为了解决这一问题,提出了一种新型单轴扭矩传感器的设计方案,并完成了实际的制造和测试。该扭矩传感器的主体为殷钢材料,由激光加工制作而成,利用电容式位移传感器测量主轴旋转时目标板的位移,从而建立输出电压与施加扭矩之间的对应关系。传感器带宽和分辨率与微飞行器飞行实验的标准相匹配,同时对离轴负载保持不敏感。经实验测定,该单轴扭矩传感器的带宽为1.1kHz,测量范围为±260.8μNm,分辨率为0.013μNm,可以满足微飞行器扭矩的测量需求。 展开更多
关键词 微飞行器 单轴扭矩传感器 敏感元件 测试范围 分辨率
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