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Search Results: 1 - 10 of 87703 matches for " 周秀丽 "
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四足机器人结构柔顺化设计与性能评价
Design and Evaluation of the Compliant Structure for a Quadruped Robot
 [PDF]

李冬冬,秀丽, 坤玲, 龚加庆
Artificial Intelligence and Robotics Research (AIRR) , 2013, DOI: 10.12677/AIRR.2013.21001
Abstract:
针对刚性四足机器人动态行走时的躯体姿态不平稳和地面冲击力大等问题,通过借鉴哺乳类四足动物的躯体结构,提出了一种以局部被动自由度为特征的四足机器人柔顺化结构,即,在刚性四足机器人腿部末端添加由压簧约束的直线移动副构成弹性腿部,在腰部添加由扭簧约束的横滚、偏转两个方向的转动副,形成柔性腰部。采用中枢模式发生器(CPG)方法建立了四足机器人的轨迹控制模型,结合力学分析和样机试验确定柔顺结构各个弹性自由度的刚度系数。物理样机运动实验表明,柔顺结构能够有效的降低四足机器人行走时的地面冲击力,减小躯干姿态变化程度,从而提高机器人行走的平稳性。
It can cause large ground impact force and postural instability when a rigid quadruped robot walks on the ground. To improve walking performances, a bio-inspired compliant structure was designed for a quadruped robot, which features four elastic legs and two flexible waist joints. The elastic legs are composed of a linear sliding pair con-strained by compression spring at the end of each leg. The flexible waist is constituted with two rotating joints in roll and yaw, which are constrained by torsion springs. A center pattern generator (CPG) model was established, used as the trajectory planner of the robot. Mechanical analysis and physcial experiments were combined to determine the stiffness of all the springs. Comparative experiments show that the elastic legs can effectively reduce the ground impact force and the flexible waist can decrease the swing of the body, which contribute to achieve higher postural stability when the quadruped robot walks on the ground.
白花丹的化学成分研究Ⅰ.白花丹全草的成分分离和鉴定
秀丽,沛椿
化学学报 , 1980,
Abstract: 白花丹为白花丹科白花丹属植物PlumbagozeyanicaLinn.,别名白雪花,为亚灌木状草本。味辛苦,性温,微毒,全株供药用。我国南部和西南部均有分布,资源丰富。印度曾将白花丹作为皮肤刺激、堕胎、利尿及发汗等药,在民间广泛流传、使用。广西民间亦用于散疮、消肿、通经活络,并治蛇伤、风湿、乳腺炎以及慢性气管炎等症。
联合SA-PSO和PDA在传感器配准中的应用 Joint Application of SA-PSO and PDA in Sensor Registration
李伟,,秀丽
- , 2015,
Abstract: 对含有系统误差的测量进行配准是准确进行数据关联的前提.实际中,许多不确定性因素导致系统误差,使其演化模型难以建立,从而导致传统配准方法不再适用.为此,提出一种基于优化SA-PSO(simulated annealing particle swarm optimization)的配准算法.由于传感器监视空域经常受到杂波的影响,在利用SA-PSO优化算法对系统误差进行配准时,不仅要考虑外界因素所引发系统误差的不确定性问题,还要考虑目标多个量测的归属问题.基于此,提出一种联合改进退火粒子群优化和概率数据关联的算法SA-PSO-PDA(simulated annealing and particle swarm optimization and probability data association),它综合考虑系统误差的随机性、寻优的最佳化和目标量测的多样性.仿真结果表明了所提算法具有可行性,且能较好地寻优系统误差参数.
发/供电公司市场均衡及竞价策略
秀丽,,王锡凡
电力系统自动化 , 2007,
Abstract: 在批发竞争的电力市场中,不仅发电公司要竞价上网,而且供电公司也要竞价购电。文中给出了批发竞争电力市场模式下发电商和供电商竞价模型,推导出了完全信息情况下发电商和供电商最优竞价策略的解析解,并用协同进化算法模拟了此模式下考虑功率约束时市场的运营,求得了市场均衡。通过算例说明了所提出算法的有效性,其结果表明市场均衡状态下发/供电公司竞价策略即为它们的最优报价策略。
光控制神经活动研究进展
秀丽,炜?,曾绍群?
生物化学与生物物理进展 , 2009,
Abstract: 神经活动即神经兴奋的产生与传递,阐明神经活动的基本过程是现代脑科学的目标之一.神经活动的光控制用光作为激活和抑制神经活动的手段,主要通过笼锁化合物、光敏感蛋白、光开关蛋白等物质的光活化或直接光刺激来实现.光控制神经活动的方法具有操作简单、非接触、高时空分辨、可定量重复等优势,因此在基础和临床神经生物学研究中具有广阔的应用前景.综述了各种光控制神经活动方法的原理、特点及最新进展,分析了其技术发展的趋势.
钢管混凝土格栅坝抗冲击性能试验及参数分析
冉永红,秀丽,
- , 2018, DOI: 10.11918/j.issn.0367-6234.201801054
Abstract: 为有效减轻泥石流大块石冲击造成的灾害,提出一种钢管混凝土格栅坝.通过固体冲击试验研究该结构的冲击动力响应,总结了结构的响应模式.同时对试验过程进行数值模拟,模拟结果与试验吻合较好.最后利用数值模拟方法对结构进行参数分析,研究桩管套箍系数、撑管径厚比和桩-撑刚度比对结构动力响应的影响.结果表明:结构的典型响应模式可以概括为构件轻微损伤、构件弯曲破坏、连接节点破坏;桩管受冲击时结构能发挥良好的整体耗能作用,而撑管受冲击时结构整体耗能作用不明显;桩管套箍系数、撑管径厚比和桩-撑刚度比对结构动力响应的影响受桩管和撑管外径、壁厚等单因素变化的制约.钢管混凝土格栅坝具有良好的抗冲击性能.
To mitigate disaster caused by the impact of debris flow boulders, a concrete filled steel tubular crib dam was proposed. Solid impact tests were carried out to study the impact dynamic response of the structure, and the response modes of the structure were summarized. The numerical simulation of the test process was performed, and the results were consistent with the test. The parameter analysis of the structure was carried out to study the influence of confinement coefficient of the piles, radius-thickness ratio of the braces, and stiffness ratio of piles and braces on the dynamic response of the structure. Results showed that the typical response modes of the structure included slight damage of member, bending failure of member, and joint failure. The structure performed good overall energy dissipation ability when the pile tube was impacted, while overall energy dissipation was not obvious when the brace tube was impacted. The influence of confinement coefficient of the piles, radius-thickness ratio of the braces, and stiffness ratio of piles and braces on the dynamic response of the structure was constrained by the single-factor variation of the diameter and thickness of piles and braces. These findings suggest that the concrete filled steel tubular crib dam provides good impact resistance.
碳税与区域经济协调发展——基于分位数回归的实证研究
徐盈之,郭进,秀丽
- , 2016, DOI: 10.15936/j.cnki.1008-3758.2016.06.006
Abstract: 摘要 以碳税的征收如何最大限度地兼顾区域经济协调发展为出发点,通过分位数回归方法,考察了开征碳税对全国及东中西和东北四大区域经济协调发展的影响效应。结果表明:就全国而言,征收碳税将显著地降低区域经济协调发展水平,且其影响效应在条件分布的不同位置存在明显的差异性。扩大人力资本规模、促进区域贸易往来能够削弱开征碳税对区域经济协调发展的负面影响;开征碳税对东部和东北地区的经济协调发展存在负面影响,且在东北地区的负面影响最为明显,而对中部和西部地区的作用效果则恰好相反。据此,从实施阶段性、差异化碳税税率等角度提出对策建议。
Abstract:The effect of introducing carbon tax on the coordinated development of national and regional economy was explored by applying the quantile regression approach for the purpose of maximizing its positive impact. The results indicated that: as to China in the whole, introducing carbon tax has a significantly negative effect on promoting the level of coordinated development of regional economy, but enhancing human capital scale and reinforcing regional trading could alleviate the negative effect; as to the four regions, introducing carbon tax has a significantly negative effect on promoting the level of coordinated development of regional economy in the eastern and northeastern regions, and the negative effect in the northeastern region is much more serious, whereas introducing carbon tax shows a positive effect in the central and western regions. Finally, some relevant policies and suggestions like carrying out periodical and differentiated carbon tax were proposed based on the results.
低碳钢连铸坯的低倍组织检验
The Low Times Structure Inspection of the Continuous Casting Slab of Low Carbon Steel
 [PDF]

唐广鹏, 贾丹斌, 杨鑫, 秀丽, 温天朋, 戴文斌
Metallurgical Engineering (MEng) , 2016, DOI: 10.12677/MEng.2016.32011
Abstract:
连铸坯的低倍检验方法是检验连铸坯的凝固组织以及宏观缺陷分布情况的一种方法。本文将几种常用的低倍检验的方法进行了分析与对比,得出在实验室条件下冷酸腐蚀是最简单、最实际的一种方法。本文针对某钢厂的低碳钢连铸坯进行冷酸腐蚀实验探索,将一些传统的腐蚀剂进行了对比,发现针对本实验钢种的实验效果不是特别理想。在腐蚀后凝固组织信息显示的比较模糊,并且柱状晶和等轴晶交界不易区分。因此针对传统的腐蚀剂进行了改良,在硝酸去离子水溶液中加入了一定比例的酒精、硫酸铁和十二烷基苯磺酸钠,针对本实验的低碳钢种能够得到清晰的凝固组织信息。
The method of low times test is used to test the solidification structure and the distribution of macro defect of the continuous casting slab. In this paper, several common methods of low times test are analyzed and compared, and then we conclude that the cold acid corrosion is the simplest and most practical method for laboratory condition. This paper aims to explore the corrosion of cold acid for the low carbon steel; however, we got unideal results after we used some traditional corrosion for this steel. Since the information of solidification structure was fuzzy, the crystal and equal axial grain have unclear boundary. So I make some improvement for the traditional corrosion. Anhydrous alcohol, ferric sulfate and sodium dodecyl benzene sulfonate are added to the aqueous solution of nitric acid in a certain proportion. Consequently, we get clear solidification structure information.
网架结构固有振动分析的分解刚度法
张文福,刘文洋,秀丽,利剑
工程力学 , 2007,
Abstract: 把矩形平面网架结构简化为夹层板,采用考虑剪切变形的具有三个广义位移的平板弯曲理论进行分析。基于分解刚度的思想提出了网架结构固有频率的计算方法,给出了八种网架结构(正放四角锥网架、两向正交正放网架、正放抽空四角锥网架、三角锥网架、三向网架、抽空三角锥网架、两向正交斜放网架和斜放四角锥网架)各阶频率的统一计算公式,对八种网架进行了固有振动分析,并与有限元分析结果进行了对比。作为一种简化的计算方法,该方法不仅计算公式简单,而且其精度比较高,误差基本在10%以内,可以为网架结构分析与设计作参考。
造纸黑液对石油焦-CO2气化的催化作用及动力学补偿效应
志杰,熊杰,秀丽,于广锁
化工学报 , 2011,
Abstract: 研究了以造纸黑液为催化剂,齐鲁石油焦-CO2的气化动力学。在950~1200℃测定了造纸黑液负载量为0~15%时石油焦的气化反应活性,发现造纸黑液使石油焦的气化反应活化能大幅度降低,表明造纸黑液具有催化作用。得到了齐鲁石油焦-CO2催化气化反应动力学的缩芯模型,并给出相应的动力学参数。催化剂用量对动力学参数的影响表明,该催化气化反应体系存在补偿效应,得到了齐鲁石油焦在不同浓度造纸黑液下进行CO2催化气化反应的动力学补偿效应方程,等动力学温度为1548K。
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