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Search Results: 1 - 10 of 61939 matches for " 蒋峰 "
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基于dSPACE半实物仿真的电液伺服控制研究
The Research of dSPACE Based on Hardware-in-the-Loop Simulation in Electro-Hydraulic Servo Control
 [PDF]

, 江磊, 许威
Mechanical Engineering and Technology (MET) , 2014, DOI: 10.12677/MET.2014.32009
Abstract:

电液伺服控制算法一般采用软件编程的方法实现,其开发过程复杂,代码编写工作繁重,开发周期长。本文介绍了基于dSPACE的半实物仿真技术,利用MATLAB/Simulink的系统建模方法和dSPACE系统的软硬件环境,开发出以dSPACE为核心的电液伺服控制实验平台,在该平台上进行了电液伺服控制的试验研究,并利用ControlDesk进行了在线调参。实验结果验证了该实验平台的可靠性,并为研究更加复杂的控制算法提供了基础。
The electro-hydraulic servo control algorithms are always achieved in the way of program, but the period of the project is long, and the process is complex because of hard working programming. A dSPACE-based hardware-in-the-loop simulation system is presented in this paper to demonstrate the direct use of MATLAB/Simulink in real-time control. Through the combination of these tools, an electro-hydraulic servo control platform based on dSPACE system is developed. The research of electro-hydraulic servo control is performed on this platform, and by the use of ControlDesk we can tuned the control parameters on line to adjust the performance of real-time system. The experiment result verified the reliability of the platform, which offers foundation for the design of more complex control algorithms.

Mlinex损失函数下指数分布的尺度参数的Bayes估计

重庆师范大学学报(自然科学版) , 2014, DOI: 10.11721/cqnuj20140211
Abstract: 在Mlinex损失函数下,求出了指数分布的尺度参数的唯一Bayes估计量,并对Bayes估计δB的容许性和形如dc+T(x)的估计量的容许性进行讨论。其主要结果是在Mlinex损失函数下,指数分布的尺度参数的唯一Bayes估计是*,而且可容许的;形如*时是可容许的。(注*处为公式)
钢纤维混凝土中的钢纤维

工业建筑 , 1983, DOI: 10.13204/j.gyjz198312011
Abstract:
镍催化芳烃卤化物还原性交叉偶联的反应机理
,任清华
物理化学学报 , 2014,
Abstract: 利用密度泛函理论(dft)计算研究了镍催化的溴苯(r1)与对溴苯甲酸甲酯(r2)生成非对称联芳化合物的还原性交叉偶联反应的机理.结果表明,相对于一价镍的催化机理,零价镍作为活性催化剂更有利于反应的进行,零价镍催化剂首先与r1络合或者首先与r2络合的反应机理十分相似,其决速步在气相时的能垒分别是70.50或者49.66kj·mol-1.零价镍催化机理包括如下步骤:一次氧化加成;还原;二次氧化加成;还原消除以及催化剂再生.另外,计算结果还表明有机锌试剂在这个反应体系中很难生成.
助阳益气涤浊法治疗血管性眩晕62例

中国中医药信息杂志 , 2004,
Abstract:
改良Carlson后外侧入路治疗胫骨平台单纯后外侧柱骨折
A Modified Carlson’s Posterolateral Approach for the Treatment of Posterolateral Coronal Fractures of the Tibial Plateau
 [PDF]

吴晓,, 孙文阁, , 孙斌, 钱平康
Hans Journal of Surgery (HJS) , 2016, DOI: 10.12677/HJS.2016.51002
Abstract:
目的:探讨改良Carlson的后外侧入路锁定钢板内固定治疗胫骨平台后外侧骨折的手术方法及临床疗效。方法:自2010年1月至2013年12月,采用改良后外侧切口显露胫骨平台后外侧,对48例胫骨平台后外侧骨折进行手术治疗。男28例,女20例;年龄19~65岁,平均37岁。术后采用HSS评分标准评定关节功能,并通过对患膝TPA、PA角度的测量及关节屈伸活动度对疗效进行评估。结果:所有患者术后获12—18个月(平均15.7个月)随访,骨折均获愈合。所有患者术后3、6、12个月膝关节HSS评分差异均无统计学意义(P > 0.05),术后即刻、3个月、6个月及12个月胫骨平台内翻角及后倾角比较差异均无统计学意义(P > 0.05)。无手术切口相关并发症发生,无腓总神经症状、无感染、内固定失效及螺钉断裂等并发症发生。结论“改良Carlson后外侧入路支撑钢板固定是治疗胫骨平台后外侧柱骨折的一种有效方法,能够充分显露手术区域,最大限度提供后外侧内固定的生物力学强度,是治疗胫骨平台后外侧柱骨折的理想入路。
Objective: To introduce a modified Carlson’s posterolateral approach using locking plate for the treatment of posterolateral coronaI fractures of the tibial plateau. Methods: From January 2010 to December 2013, 45 patients with the posterolateral coronal fracture of the tibial plateau were operated on. They were 28 males and 20 females, with a mean age of 37 years (range, from 19 to 65 years). The patients were treated with buttress plate fixation via a modified Carlson’s posterolateral approach. The knee functions were estimated with the Hospital for SpeciM Surgery (HSS) score system at 3 months, 6 months and 1 year postoperatively. Imaging data based on the measurement of angle of knee TPA, PA and joint flexion mobility to evaluate the curative effect were compared immediately, 3, 6 and 12 months after operation respectively. Results: The 48 patients were followed up for an average of 15.7 months (range, from 12 to 18 months). All patients obtained bony union. There were no significant differences regarding the mean HSS score among 3 months, 6 months and 1 year postoperation (P > 0.05). There were no significance differences regarding the tibial plateau angle and posterior slope angle oil radiographies among immediate, 3, 6 and 1 2 months postoperation(P > 0.05). No complications associated with the approach were observed and there was no infection or fixation failure either. Conclusion: Because the modified Carlson’s posterolateral approach can provide direct visual exposure to protect ligamentous structures and the soft tissue around the posterolateral fragments, utmost to provide the biomechanical strength of the posterolateral internal fixation, it can be effectively used to treat posterolateral coronal fractures of the tibial plateau.
基于火柴棍模型的煤体迂曲度理论研究
Theoretical Research on Tortuosity of Coal Based on the Matchstick Model
 [PDF]

刘昂, 黄艳涛,
Mine Engineering (ME) , 2016, DOI: 10.12677/ME.2016.43012
Abstract:
为了更好的研究煤体孔裂隙结构特征以及求取相关表征参数,本文基于理想的火柴棍模型,结合达西定律和修正的泊谡叶方程,经过严格的理论推导,得到了适用于煤体的迂曲度理论表达式,并以初始迂曲度为参考推导了迂曲度的修正式,同时结合Klinkenberg系数给出了一种初始迂曲度的计算方法。研究结果为求取表征煤体孔裂隙特征的相关参数提供了可行的方法,具有一定积极意义。
In order to research the structure characteristics of pores and fissures and seek the related cha-racterization parameter of coal, this article based on the ideal matchstick model, combined the Darcy equation and the modified Poiseuille equation and deduced the theoretical expression of tortuosity applicable to coal through strict theoretical derivation. Then the modified expression of tortuosity was deduced in reference of the initial tortuosity, at the same time, we got a calculation method of initial tortuosity by combing the Klinkenberg coefficient. The research results provide a feasible method for calculating the related parameters representing the features of pores and fissures, and have positive effect.
移动设备中的人机交互设计研究
,竹鸣
包装工程 , 2014,
Abstract: 目的 研究人机交互设计在移动设备中的应用。方法 多角度分析和解答移动设备中人机交互的各项指标, 首先强调人机交互的地位, 接着将人机交互与传统的学习方法进行对比, 由此得出多种可以让人更完美匹配移动设备的使用经验。结论 从研究背景、 设备优劣势分析、 人机优化探索和案例分析 4个方面分析人机交互设计在移动设备中的应用方式, 通过多平台的优劣势比较及对人机交互的剖析, 得出人机交互设计可以使移动设备更方便人们使用。
经验研究视角下的会计信息质量定量评价
,袁建国
财会月刊 , 2009,
Abstract: 本文基于经验研究中会计信息质量替代变量这一视角,对会计信息质量定量评价的研究成果进行了回顾与评述,并提出了我国在未来进行会计信息质量经验研究及对会计信息质量进行综合评价应当关注的问题。  【关键词】会计信息经验研究盈余质量会计信息是资本市场进行资源配置和国家进行经济调控的基础,其质量高低直接影响着资本市场运行的效率和国家宏观调控的效果。因而,会计信息质量的评价不仅是会计经验研究中的核心问题,同时也是会计监管中的关键问题。尤其在我国新企业会计准则颁布实施后,如何对企业的会计信息质量进行科学的评价就成为我国会计理论研究和会计监管实务中一个亟待解决的重大课题。然而到目前为止,学术界和广大企事业单位对会计信息质量定量综合评价的方法还缺乏统一认识。本文试图从国外学者在相关经验研究中所采用的会计信息质量替代变量这一视角,对会计信息质量定量评价的相关研究文献进行阶段性总结评述,以期对我国学术界进行相关的会计信息质量经验研究和发展适合我国会计信息质量综合评价方法有所裨益。  一、以信息披露质量替代会计信息质量的研究
稀土的光化学(Ⅱ)用光氧化法分析钇族混合稀土中的铽
广,苏锵
分析化学 , 1988,
Abstract: 根据Tb3+在KIO4-KOH体系中的光氧化反应,建立了钇族混合稀土中Tb的分光光度分析方法.在高压汞灯366nm的光辐照下,从无色的Tb3+氧化为红棕色的Tb4+,其吸收谱带的峰值在420nm,其他三价钇族稀土无此反应,故无干扰.在Tb的分析浓度范围为1×10-5M-1×10-3M时,符合Beer定律,Tb在钇族混合稀土中含量的分析最低限为0.2%.此方法可以用于萃取钇族稀土过程中Tb的分析,方法简便、快速.
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