oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 74 )

2018 ( 2214 )

2017 ( 2262 )

2016 ( 2543 )

Custom range...

Search Results: 1 - 10 of 92266 matches for " 缑斌丽 "
All listed articles are free for downloading (OA Articles)
Page 1 /92266
Display every page Item
一种齿轮强度可靠性设计的改进方法
袁成荣,,王立杰
南京林业大学学报(自然科学版) , 1999, DOI: 10.3969/j.jssn.1000-2006.1999.05.009
Abstract: <正>在原先齿轮强度可靠性设计中,强度和应力均按正态分布近似处理,计算精度较低。将齿面接触疲劳强度按威布尔分布、应力按正态分布处理,将齿根弯曲疲劳强度和应力均按对数正态分布处理,再根据平均安全系数和可靠度之间的关系,推导出了齿轮强度可靠性设计和校核公式。通过改进,使齿轮强度可靠性计算精度有所提高。
波纹管膨胀节波形曲线拟合及波距检测算法研究
崔亚飞,刘英,朱庆南,王一宁,杨雨图,
- , 2018, DOI: 10.13543/j.bhxbzr.2018.01.014
Abstract: 由于国内波纹管膨胀节波距检测还处于手工测量阶段,存在着效率差、精度低、劳动强度大等缺点。设计了基于激光扫描技术的波纹管膨胀节波距检测系统,提出一种波纹管膨胀节波形曲线拟合及波距检测的算法,开发了一种能够自动获取波纹管膨胀节伸缩变形的波形点云数据、并能实现波形的逆向重构及波距计算的软件。该系统适用于波纹管膨胀节通径50mm~1500mm、双试验件总长1500mm~2500mm、试验压力0.1MPa~6.4MPa范围内变化的试验件波形检测,可自动调整扫描仪至膨胀节的距离,并能剔除检测过程中出现的各种干扰数据,波距测量精度达0.05mm。
Abstract:The measurement of wave pitch of bellows expansion joints is still in the manual vernier caliper measurement stage, which is not only inefficient, low precision, large labor intensity, but also many other shortcoming. In this paper, a waves pitch detection system of bellows expansion joints based on laser scanner technology was designed, a waveform fitting algorithm and wave pitch detection algorithm for bellows expansion joint was proposed, and a software automatically obtaining the point cloud data, conducting the waveform reconstruction and calculating wave distance had also been developed. The system is suitable for the bellows expansion joint test piece waveform detection, which diameter is from 50mm to 1500mm, the whole length of the double test pieces is from 1500mm-2500mm, and the test pressure is from 0.1MPa-6.4MPa, it can adjust the distance between the scanner and the expansion joints automatically, and eliminate all kinds of interference data, the measurement accuracy of wave distance is 0.05mm.
三种流动型式的熔融碳酸盐燃料电池单体性能数值分析
,许世森,程健
中国电机工程学报 , 2011,
Abstract: 介绍自行研制的10cm′10cm单体熔融碳酸盐燃料电池(moltencarbonatefuelcells,MCFC)的实验研究结果,并以自制单电池稳定放电实验数据为基础,分析拟合出电池电流密度–电压间的线性关系,计算出当前工艺水平电池的单位面积有效阻抗。结合理论分析建立相应的数学模型,利用数值模拟方法预测对比相同结构的1m′1mMCFC单电池局部温度、电流密度和氢气浓度等关键参数的分布状况,阴、阳极气流采用叉流、顺流和逆流3种组织型式。模拟计算结果表明:叉流型局部最高温度值最大,容易产生热点,逆流反应最激烈,局部电流密度的跨度范围最大,顺流局部温度与电流密度分布最均匀。
艺术体操个人项目成套中典型性肢体表现动作的研究
Research on Typical Body Motion in Complete Sets of Rhythmic Gymnastics Individual Events

小燕
- , 2016, DOI: 10.19582/j.cnki.11-3785/g8.2016.12.018
Abstract: 摘要:艺术的融入对体育的发展是具有很高价值的,它的融入带来了部分竞技体育项目的多样化发展模式,并提高了竞技体育项目的观赏性和社会价值,也使得艺术与体育更加变得不可分割。艺术体操成套中典型性肢体表现动作就是通过肢体的表现方式来体现音乐的内涵与情绪。虽然艺术在体育项目上的表现形式与单纯艺术表演形式有着一定的差异,但依然无法抹去艺术本身的迷人魅力。对艺术体操中肢体表现的探索,是为了更好的了解艺术体操的表现形式,将其推向一个新高度,使之变得更为靓丽。通过阅读资料,了解分析规则对艺术价值评判的变化与发展,并根据规则4年一次的变化规律,对每次变化年内的世界锦标赛比赛录像进行数据统计对比与分析,得出以下结论: 1)规则的变化对成套中典型性肢体表现动作有着最直接影响。 2)肢体表现动作是成套中艺术表现的最直接形式。3)肢体表现动作的加入对艺术体操成套的艺术性起到了至关重要的作用。4)艺术表达形式的运用,无形提升了运动员和教练员的艺术修养,也为项目带来一个更广阔的发展前景。
Abstract: The integration of art is of great value to the development of sports. Its integration has brought diversified development models of some competitive sports , improved the appreciation and social values of competitive sports, and made art and sports become inseparable. Typical body motion in complete sets of rhythmic gymnastics individual events can reflect the connotation and emotion of music through the body's way. Although there are certain differences between sport's art and pure art in performance form, the attractive charm of art itself still can not be erased. Exploration of artistic gymnastics in body motion can bring better understanding of the manifestation of rhythmic gymnastics and push it higher and more beautiful. This paper analyzed the changes and development of the rules of art value judgment by literature study, and made data analysis and comparison of World Championship video for every change-year, which changed every 4 years according to the rules. Conclusions: 1) Typical body motion in complete sets of rhythmic gymnastics individual events have the most direct influence by the changes of rules. 2) Body motion is the most direct form of the artistic expression in the complete sets. 3) Adding body motion plays a vital role in the artistry of artistic gymnastics in the complete sets. 4) The use of artistic expression invisibly improves the artistic culture of the athletes and coaches, and brings a broader development for the projects
难美项群空中身体翻转动作类型与构架研究
Types and Framework of Air Flips in Difficulty and Beauty Events

小燕
- , 2015, DOI: 10.19582/j.cnki.11-3785/g8.2015.05.019
Abstract: 摘要:鉴于当前世界竞技体育项目的高速发展,为了更好的适应新形势变化,针对表现难美性项群中自由体操、单跳、蹦床、跳水和空中技巧五个项目中,身体动作的主因子“空中身体翻转动作”进行分析研究,目的是通过该研究,能够对项目间的相互借鉴、以及项目技术的相互支撑起到一定的帮助作用,并对项目的发展具有一定的实际意义。文章通过文献资料法、访谈法、录像分析法等科学研究方法进行系统分析,得到以下结论:1)空中身体翻转动作是运动员身体在空中围绕运动轴完成单向或多向翻腾和转动的技术动作,是五个表现难美性项目的核心技术。2)依时间的递进进行观察和描述,一个完整的身体翻转动作包含起动加速、起跳、空中翻转、落停4个相互连接的技术环节。3)自由体操和单跳的空中身体翻转动作常以多式样的空中身体翻腾转体难度动作直接连接另一个空中身体翻转难度动作。4)空中身体翻转技术动作的递进式发展历程可分为五个发展阶段:单一翻腾阶段;单一的翻腾或旋转阶段;复合翻转阶段;多翻多转及“叠加”翻转阶段和自由体操与单跳进入突出平面挂串连接阶段。5)发展表现难美性项群空中身体翻转动作的对策设计为:及时研究、积极适应国际评分规则的变化,科学把握空中身体翻转动作的有序性发展规律, 主动发掘空中身体翻转技术动作的创新途径。
Abstract: Based on the rapid development of current competitive sports, in order to adapt to the new situation, this paper analyzed the air flips in five difficulty and beauty events which are floor exercise, single-hop, trampoline, diving and aerial skills, to help events learn and support from each other, and to promote events development. Literature review, interview, and video analysis methods were used in this study. Results: 1) Air flip is the skill of athlete’s body rotating in one or multiple ways in the air, and it is the core skill of the five difficulty and beauty events. 2) A whole air flip includes acceleration, take off, air flip and landing in time order. 3) Floor exercise and single-hop always contain air flips one by one. 4) The development process of air flip can be divided into five phases, which are single flip phase, single rotation phase, composite flip phase, multiple or superposition flips phase, floor exercise and single-hop enlarge room with hanging string connecting phase. 5) Studing and adapting to the new international grading rules, grasping the development rule of air flip, and diging new way can develop air flip in difficulty and beauty events
阴极不同进气对PEMFC性能影响的实验研究
闵春华,林鸿,,李增耀,何雅玲,陶文铨
工程热物理学报 , 2007,
Abstract: 针对阴极通纯氧气或空气两种情况,实验研究了温度及化学计量比的变化对反应面积为9cm~2、具有平行流场的PEMFC性能的影响。结果表明:升高电池温度可提高PEMFC的性能及极限电流密度;在本实验条件下,为提高电池性能,阴极通纯氧时,阳极化学计量比/阴极化学计量比应高于1.5/3.0,通空气时,两者之值应高于3.0/6.0;相对于阴极通空气的情况,阴极通氧气时电池性能显著提高,故在条件允许的前提下应尽量以纯氧作为氧化气体。
基于免疫克隆高斯过程隐变量模型的SAR目标特征提取与识别
张向荣,,李阳阳,冯捷,焦李成
红外与毫米波学报 , 2013,
Abstract: 作为一种非线性维数约减算法,高斯过程隐变量模型(Gaussianprocesslatentvariablemodel,GPLVM)由于其适合处理小样本、高维数据,因而在模式识别、计算机视觉等领域得到了广泛应用.基于此,提出一种基于改进GPLVM的SAR图像目标特征提取及自动识别方法,其中利用改进的GPLVM进行特征提取,高斯过程分类进行目标识别.传统GPLVM使用共轭梯度法对似然函数进行优化,为避免梯度估值易受噪声干扰、步长对算法影响严重等缺点,提出基于免疫克隆选择算法的GPLVM,利用其具有快速收敛到全局最优的特性提高算法性能.实验结果表明,该算法不仅降低了特征维数,且提高了识别精度,从而验证了算法用于SAR图像目标识别的有效性.
生物复混肥施用量对土壤养分及作物生长的影响
赵兰凤,李华兴,武龙,,胡 伟,李永涛?
土壤 , 2009,
Abstract: 通过盆栽试验,以等养分量的有机无机肥做对照,研究了生物复混肥施用量对土壤有效n、p、k含量及玉米和油麦菜生长的影响。结果表明:生物复混肥的施用可以显著提高土壤有效n、p、k含量;施n量为0.1g/kg土的生物复混肥处理可以显著提高玉米和油麦菜的n、p、k吸收量及玉米的生物量。
资产弃置义务的会计与税务处理
宇英
财会月刊 , 2010,
Abstract:   本文以石油天然气行业油气资产为例,探讨了企业对资产弃置义务的规范与业务处理,并对设立资产弃置准则、增强企业环保意识提出了建议。  【关键词】资产弃置义务会计处理税务处理  我国对资产弃置义务的规定散见于2006年颁布的固定资产准则、或有事项准则和石油天然气开采准则等。企业会计准则规定在确定固定资产成本时,应考虑预计弃置费用。弃置费用是指根据国家法律和国际公约规定,企业承担环境保护和生态恢复等义务所发生的支出。对于核电站设施的弃置及恢复环境义务,企业应按照现值计算确定计入固定资产成本的金额和相应的预计负债;石油天然气行业承担的矿区弃置义务,在满足预计负债确认条件的前提下,应将该义务确认为预计负债,并增加井及相关设施的账面价值,主要涉及井及相关设施的弃置、拆移、填埋、清理和恢复生态环境等所发生的支出。
采用Haar小波与Gabor小波特征的级联式人脸检测方法
陈威,
华侨大学学报(自然科学版) , 2011, DOI: 10.11830/ISSN.1000-5013.2011.05.0520
Abstract: 研究Gabor小波的构造及其特点,将其与AdaBoost算法相结合,优化原算法的性能.提取的Gabor特征对应到指定滤波器的指定采样点上,只需取这些指定采样点的一个领域内的图像与指定滤波器进行卷积,而不需要将整个图像与整个滤波器组进行卷积,可大大降低计算量提高运算速度.最后,通过算法对特征进行筛选,得到迭代误差率较低的特征来构建强分类器.
Page 1 /92266
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.