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Search Results: 1 - 10 of 54625 matches for " 尹立中 "
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贮箱类液固耦合动力学研究
,赵阳,王本利,邹经湘
工程力学 , 2000,
Abstract: 以常重力作用下矩形贮箱类液固耦合系统受到俯仰激励情形为例,本文采用与以往不同的方式,在描述耦合系统中的液体子系统和结构子系统时,分别运用了两种不同形式的Lagrange函数,以此为基础可以得到降阶的系统耦合动力学方程,该方法大大减少了公式的推导工作。通过一个算例,讨论了该耦合系统的非线性动力特性。本方法可推广应用于分析圆柱等其它形状贮箱中液体的三维晃动情形下的液固耦合系统动力学特性。
俯仰运动圆柱贮箱中液体的非线性晃动
,邹经湘,王本利
力学学报 , 2000, DOI: 10.6052/0459-1879-2000-3-1998-207
Abstract:
基准面旋回格架内砂体开发响应
太举,张昌民,,,曾大乾,艳树
自然科学进展 , 2003,
Abstract: 通过岩心、测井曲线研究,在濮城油田沙三中6~10识别出超短期、短期、中期、长期4级基准面旋回,建立了储层格架,以短期旋回为单位讨论了层序格架内油气分布和砂体开发响应.基准面旋回格架对油气的分布、砂体的开发响应和剩余油分布有明显的控制作用.油气富集部位与基准面位置相关,基准面低位处的砂体油气储量和储量丰度均较高,而基准面高位处砂体油气储量和丰度较低.基准面低位处砂体物性较好,较易动用,采出油气数量和采出程度较高,但由于其本身的储量较大,剩余油仍占据着主要的地位.基准面高位处砂体物性较差,储量较难动用,采出油量和采出程度均较小,但受其本身储量的限制,其剩余油量在剩余可采储量中的比例较小.
NONLINEAR SLOSHING OF LIQUID IN A CIRCLE CYLINDRICAL CONTAINER UNDER PITCHING EXCITATION
俯仰运动圆柱贮箱中液体的非线性晃动

Yin Lizhong,Zou Jingxiang,Wang Benli,
,邹经湘,王本利

力学学报 , 2000,
Abstract: In this paper, the nonlinear sloshing of liquid in a circle cylindrical tank under pitching excitation is studied analytically for the first time. Owing to the complexity of problem, it is very difficult to solve the nonlinear sloshing of liquid in a container subjected to forced pitching and (or) yawing oscillation by existing methods. Therefore, a method used to analyze this problem is presented. Firstly the nonlinear initial-boundary problem of PDE system for liquid sloshing in a container under pitching and (or) yawing excitation is established. With regard to the previous problem, variational principle and Lagrange function in the form of the volume integration of liquid pressure are obtained. Based on the variation equation and new Lagrange function proposed, nonlinear dynamic system for sloshing of liquid in a circle cylindrical container under pitching and (or) yawing excitation is derived. Subsequently, the nonlinear dynamic system gives the free surface kinematics and dynamic boundary condition. At the same time, the present method greatly reduces the work of formula derivation. Finally, the nonlinear dynamic system is solved by the multiple scale method. The dynamic characteristic of nonlinear liquid sloshing is analyzed in detail. Some kinds of motion which may appear in the liquid sloshing are discussed. Response curves and stable-unstable regions of liquid motion are determined. As to two-dimensional sloshing in a rigid, rectangular, open tank, the comparison between theoretical result by the present method and experiments shows good agreement. So, the present method is proved feasible. By means of the present method, the coupled dynamics of liquid in a tank and structure may also be investigated analytically.
液体非线性晃动的同步Hopf分叉现象
贺元军,,马兴瑞,王本利
工程力学 , 2007,
Abstract: 针对受俯仰激励作用的圆柱形贮箱中液体非线性晃动,用变分原理建立了液体晃动的压力体积分形式的Lagrange函数;并将速度势函数在自由液面处作波高函数的级数展开,从而导出自由液面运动学和动力学边界条件非线性方程组;最后用四阶Runge-Kutta法求解非线性方程组。计算发现,在一定的激励频率内面外主模态和次生模态发生同步Hopf分叉,并给出了发生分叉的频率区域。
窄长方形贮箱中液体的强迫晃动
苟兴宇,,马兴瑞,黄怀德
力学与实践 , 1998, DOI: 10.6052/1000-0992-1999-297
Abstract: 本文求解了窄长方形贮箱中液体的强迫晃动,给出激励中含恒定分量时的几种液面波高修正方法,并对它们作了比较.
六价铬细菌还原的分子机制研究进展
李斗,赵由才,,雅洁,王洋清,
环境科学 , 2014,
Abstract: 工业化进程中铬(Cr)的广泛使用造成了严重的环境污染,其中Cr(Ⅵ)由于具有致癌、致畸变作用以及极强的水相迁移性使其成为Cr污染的主要形式,而Cr(Ⅲ)在环境中易形成沉淀且毒性较小,因此将Cr(Ⅵ)还原成Cr(Ⅲ)被认为是一种有效的Cr(Ⅵ)污染治理策略.Cr(Ⅵ)还原成Cr(Ⅲ)可以通过化学反应或微生物转化,其中细菌介导的Cr(Ⅵ)还原是一种极具潜力的铬污染修复方式,具有反应温和、能耗低且无二次污染等特点,因此其还原过程的分子机制受到了越来越多的关注.本文总结了已发现的Cr(Ⅵ)还原细菌种类以及在污染治理中的应用,并详细阐述了Cr(Ⅵ)还原的分子途径和具体的功能蛋白,逐级深入的展示了目前已研究的Cr(Ⅵ)细菌还原的分子机制,对目前该领域存在的科学问题及未来的发展方向进行了归纳和总结.
核心稳定性训练对脑梗死患者平衡功和步行能力的影响
朱志,苗苗,,周晓娜,于洋,闫华
- , 2017,
Abstract: 目的观察核心稳定性训练对脑梗死患者平衡功能和步行能力的影响。 方法将56例脑梗死患者按随机数字表法分为治疗组和对照组,每组28例。2组均采用常规康复训练,治疗组在常规康复训练基础上增加核心稳定性训练。治疗前和治疗6周后,分别采用Berg平衡量表(BBS)、最大步行速度(MWS)及“起立-行走”计时测定(TUGT)评价患者的平衡功能及步行能力。 结果治疗前,2组患者BBS、MWS、TUGT比较,差异统计学意义(P>0.05)。治疗6周后,2组患者BBS、MWS、TUGT均较组内治疗前改善(P>0.05)。与对照组治疗6周后比较,观察组患者BBS[(46.67±5.35)分]、TUGT[(16.86±5.33)s]较为优异,差异有统计学意义(P<0.05)。 结论核心稳定性训练能提高脑梗死患者的平衡功能及步行能力
邢台市工业用水特征与节水效益分析计算
Industrial Water Characteristics in Xingtai City and Analytical Calculation of Water Saving Benefit
 [PDF]

, 新明
Journal of Water Resources Research (JWRR) , 2015, DOI: 10.12677/JWRR.2015.41001
Abstract:
通过对邢台市工业用水和节水效益分析计算,为工业发展规划、合理高效利用水资源提供科学依据。采用邢台市2001~2012年用水量资料,对邢台市各行业用水比重、工业用水变化趋势以及万元产值净用水量进行分析。邢台市工业用水占总用水量的10.95%;工业用水量年际变化较大,工业用水量总体呈下降趋势,平均每年减少0.0056亿m3;通过对邢台市各行政区万元产值净用水量分析,各行政区之间相差较大,高用水工业万元产值用水量为12.92 m3,一般工业为5.58 m3。邢台市工业用水量减小而工业增加值逐年上升,主要措施是:实现不同行业间的循环用水,提高节水管理水平;严格实行建设项目水资源论证制度,提高水资源承载能力;大力推行水平衡测试制度,为全面总量控制、定额管理奠定了基础。
Analysis of industrial water and calculation of water saving benefit in Xingtai city provide scientific basis for the industrial development planning, and rational and effective utilization of water resources. Using data of water use in Xingtai city during 2001-2012, proportion of water use for each industry, industrial water changing trends and net duty of water for ten thousand Yuan output value are analyzed. Xingtai city industrial water accounts for 10.95% of the total amount of industrial water use; annual change of industrial water use is large and the overall industrial water use trends down decreasing 560,000 cubic meters annually; through analyzing net duty of water for ten thousand Yuan output value of each administrative region in Xingtai city, it is found that there is a large difference between administrative regions, water consumption of ten thousand Yuan output value of industry with high water use is 12.92 cubic meters, and that of general industry is 5.58 cubic meters. Industrial water use in Xingtai city is reduced and the industrial added value increases year by year. The main measures are: achieving the recycling of water between different industries, and improving the management level of water saving; strictly implementing the system of water resources argumentation of construction project, and improving the bearing capacity of water resources; vigorously promoting the water balance test system, which lays the foundation for the total amount control and quota management.
有氧运动训练对中度脑外伤患者认知功能的影响
苗苗,张玥,杨风英,周晓娜,,朱志,张琳瑛,王宏图
- , 2016,
Abstract:
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