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Search Results: 1 - 10 of 103769 matches for " 马文来 "
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非球弹丸超高速撞击航天器防护结构数值模拟
张伟,马文,管公顺,庞宝君
爆炸与冲击 , 2007, DOI: 10.11883/1001-1455(2007)03-0240-06
Abstract: ?采用AUTODYN软件对非球弹丸超高速正撞击航天器单防护屏防护结构进行了数值模拟,给出了2维及3维模拟的结果。研究了在相同质量和速度的条件下,不同形状弹丸长径比、撞击方向等对超高速撞击防护结构所产生碎片云特性及舱壁损伤尺寸的影响,并与球形弹丸撞击所产生的碎片云及舱壁损伤进行了比较。结果表明弹丸的长径比越大,弹丸的穿孔能力越强;非球弹丸的撞击方向不同,所产生的碎片云形状、质量分布、破碎的程度和穿孔的能力是不同的。
弹丸超高速撞击铝靶成坑数值模拟
张伟,马文,马志涛,庞宝君
高压物理学报 , 2006, DOI: 10.11858/gywlxb.2006.01.001
Abstract: 低地球轨道的各类航天器易受到微流星体及空间碎片的超高速撞击,损伤航天器飞行关键系统,进而导致航天器发生灾难性的失效。微流星体及空间碎片防护结构设计,是航天器设计的一个重要问题。采用AUTODYN软件进行了弹丸超高速正撞击及斜撞击铝靶成坑的数值模拟,给出了二维及三维模拟结果。研究了弹丸密度、弹丸形状、板厚度、弹丸速度、弹丸直径和弹丸撞击入射角等对靶成坑的影响。模拟结果同实验结果进行了比较,模拟的成坑形状和特征尺寸同实验相吻合。验证了数值模拟方法的有效性。
sars冠状病毒主要蛋白酶构象运动性分析
陈浩,马文,鲁华
北京大学学报(医学版) , 2003,
Abstract:
工业Fe-Cu-K催化剂上费托合成反应动力学(Ⅱ)——模型筛选与参数估值
马文,李永旺,赵玉龙,周敬,钟炳
化工学报 , 1999,
Abstract: 依据本文(Ⅰ)报获得的费托合成动力学模型及水煤气变换反应动力学模型,结合在固定床中测得的动力学数据,对几个候选动力学模型进行了参数回归。结果表明,表面碳化物烯烃再吸附机理模型和CO_2脱附为控制步骤的水煤气变换反应动力学模型能较好地拟合实验数据,所得最终费托合成机理动力学模型满足模型检验要求,且回归得到的活化能值与文献结果一致。
工业Fe-Cu-K催化剂上费托合成反应动力学(Ⅰ)——基于机理的动力学模型
马文,李永旺,赵玉龙,徐元源,周敬
化工学报 , 1999,
Abstract: 由费托合成反应碳化物机理出发,考虑费托合成产物中烯烃再吸附对反应产物分布影响的事实,首次导出了费托合成反应动力学模型。该模型中由于引入烯烃再吸附项链增长几率不再是一个常数,因而更适合于解释铁基催化剂上非理想Anderson-Schulz-Flory产物分布.
基于脑电超慢涨落图的芪参复康胶囊治疗焦虑症疗效分析
赵瑾,,李新田,张彦,吴兴曲,马文
中国中医药信息杂志 , 2012, DOI: 10.3969/j.issn.1005-5304.2012.07.033
Abstract:
试论《伤寒论》之厥阴病
Discussion of the Jue Yin Disease in Shanghan Lun
 [PDF]

燕茹, 马文
Traditional Chinese Medicine (TCM) , 2013, DOI: 10.12677/TCM.2013.22005
Abstract: 刘绍武先生通过对《伤寒论》厥阴病篇条文的研究,提出《伤寒论》第326条不能作为厥阴病的提纲条文,其所论述的证候均属于消化系统里部病候。认为厥阴病的提纲应为:“厥阴之为病,手足逆冷、脉细、恶寒、肢节痹痛。”厥阴病属于表部的阴性病,当以当归四逆汤治疗。
After study the Jue Yin disease on the Shanghan Lun, Shaowu Liu proposed that Article 326 can’t synopsis as Jue Yin disease. It discussed syndromes all belongs to the digestive system in the department. He believes Jue Yin disease synopsis should be: “Jue Yin is a disease, cold symptoms as deep cold sensation of the limbs, weak pulse, aversion to cold, limb arthralgia.” Jue Yin disease is a external yin disease, which should be treated by using Danggui Sini Tang.
Experimental Investigation for Normal Impact on Single Bumper Shield at First Threshold Velocity Range
第一门槛值区间单防护屏防护正撞击实验研究

ZHANG Wei,PANG Bao-jun,MA Wen-lai,ZHANG Ze-hua,
张伟
,庞宝君,马文,张泽华

实验力学 , 2000,
Abstract: An impact experiment for spacecraft structure is reported, where the impact happens between a cylindrical projectile and a single bumper shield, and the impact velocity is within the first threshold velocity range. Results of the experiment are analyzed. Information on damage characteristics and failure mode is obtained.
Analysis of Crater Forming Characteristic by Liquid Drop Striking Structural Liquid Target
液滴撞击结构液靶成坑特点分析

CHU Ying-zhi,MA Wen-lai,PANG Bao-jun,GAI Bing-zheng,
褚英志
,马文,庞宝君,盖秉政

实验力学 , 2004,
Abstract: In this paper, experiments of the impact of liquid drops against liquid mutil-layer target were carried out. In these experiments the liquid drops dripped with various height and the liquid layer thickness of liquid target changed. By high-speed video camera the parameters of impact crater were recorded, the films negatives were scanned and date was inputted to computer, the final parameters were obtained from collection by soft Photoshop. A theoretical analysis was made to study the principles of the crater forming process. The crater is formed only in the first layer of the liquid target within certain impacting energy. The interface energy is one of the important parameters of crater forming process if there are dissolution phenomena between the liquid multi-layers. According to energy conversation and the analysis of the impacting energy transformation, the equation of the cavity diameters is obtained.
sars冠状病毒主要蛋白酶结构模建及活性部位运动性分析
刘士勇,裴剑锋,陈浩,祝小雷,刘振明,马文,贺风雷,鲁华
北京大学学报(医学版) , 2003,
Abstract: ?sars冠状病毒3cl蛋白酶是病毒复制过程中的关键酶,有可能成为针对抗sars药物研制的重要靶标.利用同源模建的方法建立了sars冠状病毒3cl蛋白酶的结构模型,对于二聚体中蛋白质分子间相互作用分析表明该蛋白在溶液中有可能形成二聚体.利用分子动力学与多正则系综采样相结合的方法对于sars冠状病毒3cl蛋白酶活性部位的两个环区进行了构象模拟,找到了两种代表性构象,预示着sars冠状病毒3cl蛋白酶在催化过程中有可能伴随着构象变化.
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