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Search Results: 1 - 10 of 330055 matches for " 李志鹏 "
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第20届巴西世界杯足球赛亚洲球队与四强球队技战术运用情况的对比分析
The Contrastive Analysis of Tactics Application between Asian Teams and Four Top Teams in the 20th Brazil World Cup
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,
Advances in Physical Sciences (APS) , 2016, DOI: 10.12677/APS.2016.43017
Abstract:
运用文献资料、录像观察、数理分析等方法,通过对第20届世界杯足球赛亚洲参赛球队与四强球队在球员身体形态、比赛阵型、进攻技战术、防守技战术等方面进行比较研究。结果显示:(1) 亚洲球员在顶级联赛效力人数少;(2) 亚洲球员身体形态方面与四强球队有差距;(3) 在战术阵型上,本届世界杯大部分球队都采用4-2-3-1的攻守平衡阵型;(4) 攻击能力和防守能力等方面亚洲球队存在明显的不足,四强球队将个人技术和整体的完美结合是今后足球发展的趋势。
We have made a comparative study about players’ body shape formation, game formation, attacking tactics and defensive tactics, etc. between Asian teams and four top teams in the Twentieth Brazil World Cup, by using the methods of literature, video observation, and mathematical analysis. It turns out that, (1) the Asian players in the top league is few; (2) there is difference on the players’ body shape between Asian players and the top four teams players; (3) on the tactical formation, most of the World Cup teams took the 4-2-3-1 perfect balance formation; (4) there are obvious deficiencies about the attack and defensive ability on Asian teams, and the perfect combination of personal technology and the overall like the last four teams will be the development of football in the future.
水稻土和湿地土壤有机碳测定的cns元素分析仪法与湿消化容量法之比较

土壤 , 2008,
Abstract: 土壤固碳研究中需要精确的(有机)c计量,而常规的湿氧化法与cns元素分析仪法测定结果的吻合性是c计量中的问题。国外对旱地土壤的研究表明,这两种方法的结果基本可以对比,但是否同样对于湿地土壤也适用还不清楚。采用cns元素分析仪(仪器法)和重铬酸钾外加热湿氧化法(容量法)对20个水稻土样品,26个淡水湿地土壤样品和20个沿海湿地土壤样品进行了总有机c(toc)的对比测定。结果表明,无论是土壤的表土样品还是剖面样品,仪器法测定结果约低于容量法10%以下。两种方法对淡水湿地土壤和水稻土的有机c含量的测定可以对比,但是重铬酸钾氧化容量法对于含氯化物较高的沿海湿地土壤有机c的测定可能不精确。cns元素分析仪测定的精密度和准确度较高,可以用于各种湿地土壤的c计量。
社会资本对家庭“因病致贫”有显著减缓作用吗?—基于大病冲击下的微观经验证据
李华,
- , 2018, DOI: 10.16538/j.cnki.jfe.2018.06.006
Abstract: 文章在理论假说基础上,利用2013年CHARLS数据,采用Probit和工具变量模型,实证检验了多维社会资本在大病冲击下是否仍能起到显著减缓贫困的作用。结果表明:在没有大病冲击时,社会资本均可以起到显著的减贫作用。但大病冲击前后,社会资本对贫困发生率的影响结果存在差异。社会资本降低贫困发生率的结果为:个人社会活动每增加0.1分,其大病冲击前后的贫困率分别降低5.1%和7.5%;每增加1个社区活动场所,大病冲击前后的贫困率可分别降低0.71%和1.63%;亲友经济往来金额每增加50%,大病冲击前后的贫困率可分别降低11.9%和3.9%;家庭照料不受大病冲击的影响,且有被减弱的可能性;家庭借贷减贫作用始终不显著。即社会资本对家庭因病致贫具有显著减缓作用,与不同社会经济状况人群交往的“桥型”社会资本比家庭亲友内部交往的“结型”社会资本的减贫作用更强。文章为重视培育以家庭为主体的社会资本,发挥其非正式制度治理因病致贫的作用提供了微观经验证据。
对五八区佳木河组沉积特征和储层特征的整体认识
The Overall Understanding of the Sedimentary Characteristics and Reservoir Characteristics of the Jiamuhe Formation, 5-8 District
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, 刘明军,, 龚福华
Advances in Geosciences (AG) , 2016, DOI: 10.12677/AG.2016.63017
Abstract: 准噶尔盆地西北缘五八区佳木河组地层厚度较大,火山岩和碎屑岩共存。研究区发育有5个相,分别是冲积扇相、扇三角洲相、喷溢相、爆发相和再搬运火山碎屑岩相。佳木河组一段发育火山岩相和扇三角洲相以及冲积扇的扇中亚相,而火山岩分布范围广,且多岩断层分布。佳木河组一段物性较好,I、II类储层较多,且多发育在火山相中,而碎屑岩多为III类储层。佳木河组二段和三段以扇三角洲为主,三段的火山岩相比二段发育。佳木河组二段和三段以III类储层为主,同样发育有I、II类储层。佳木河组多为好储层,且试油量较高,因此佳木河组可作为油气勘探开发的重点层位。佳木河组的I、II类储层主要发育在喷溢相的下部亚相和爆发相的热碎屑流亚相,火山岩储层值得重视,重点对裂缝和溶蚀带进行预测。
The stratum of Jiamuhe Formation in northwestern margin of the Junggar basin is very thick, which consists of volcano rock and clastic rock. There are 5 facies in the study area including alluvial fan facies, fan delta facies, effusive facies, eruption facies and retransported volcano clastic facies. The first member of Jiamuhe Formation, in which volcanic rock widely distributes along the fault, develops volcano facies, fan delta facies and middle alluvial fan sub-facies. The physical property of the first member of Jiamuhe Formation is better, which develops I or II class reservoir in the volcano clastic rock facies while the class III reservoir mostly develops in the clastic rocks. The fan delta facies are widely developed in the second member and third member of Jiamuhe Formation, and the volcanics in the third member are much more than the second member. The mainly reservoir type in the second member and third member of Jiamuhe Formation is III class reservoir, while I, II class reservoirs are also developed in it. Jiamuhe Formation is a good reservoir, the oil content is high, and soit can be taken as a key position for oil & gas exploration and development. The I class and II class reservoirs in the Jiamuhe Formation are mainly developed in the lower subfacies of effusive facies and hot detrital flow subfacies of outbreak facies. Volcanic rock reservoir is worth paying attention to and focusing on the prediction of fractures and dissolution zone.
睫状体冷凝联合小梁切除术治疗新生血管性青光眼25例疗效观察
Effectiveness Observations of Cyclocryotherapy Combined with Trabeculectomy to Neovascular Glaucoma in 25 Cases
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国栋, 文雪薇,
Hans Journal of Ophthalmology (HJO) , 2016, DOI: 10.12677/HJO.2016.53010
Abstract:
目的:探索睫状体冷凝术联合小梁切除术治疗新生血管性青光眼的疗效。方法:选择2012.1~2014.12于昆明医科大学第一附属医院眼科住院治疗的新生血管性青光眼患者,共25例(25眼),先进行全视网膜激光光凝,所有患者均给予经睫状体平坦部玻璃体腔注射Lucentis 0.1 ml (1.0 mg)。注药3天后,行睫状体冷凝术联合小梁切除术,观察手术前至术后1 w、1 m、3 m、6 m,分别记录两组的病人自觉症状、眼压、视力、并发症情况。结果:术后所有患者的眼部胀痛消失,术后1 w、1 m、3 m、6 m平均眼压较术前明显降低,分别降低22.64 mmHg,23.6 mmHg,24.2 mmHg,26.16 mmHg。差异有统计学意义(P < 0.001)。1例术后低眼压,1例浅前房,8例前房积血,3例眼球萎缩,2例行眼内容物剜出。结论:睫状体冷凝术联合小梁切除术对于治疗新生血管性青光眼有显著效果。
Objective: To observe the results of cyclocryotherapy combined with trabeculectomy to neovascular glaucoma. Methods: 25 eyes in 25 cases with neovascular glaucoma in the First Affiliated Hospital of Kunming Medical University from Jan. 2012 to Dec. 2014 were analyzed retrospectively. Pan-retina photocoagulations were executed firstly. All patients were treated with intravitreal injection of Lucentis 0.1 ml (1.0 mg) pars plana at first. 3 days latter, 25 eyes were treated by cyclocryostherapy combined with trabeculectomy. Pre- and post-operative (1 week, 1 month, 3 months, 6 months) swelling pain of eye, intraocular pressures (I0P), visual acuity and complications were observed. Results: All the swelling pain of the eye disappeared. The average IOP reduced greatly. The IOP decreased 22.64 mmHg, 23.6 mmHg, 24.2 mmHg, 26.16 mmHg in 1 week, 1 month, 3 months and 6 months in post-operation, respectively. The difference was statistically significant (P < 0.001). After operations, intraocular hypotension in 1 case, shallow anterior chamber in 1 case, anterior chamber hemorrhage in 8 cases, and eyeball atrophy in 3 cases were observed, respectively. 2 eyes were enucleated lastly. Conclusions: Cyclocryotherapy combined with trabeculectomy should be a good method for controlling neovascular glaucoma.
单晶硅薄膜面向热导率分子动力学研究
,
工程热物理学报 , 2003,
Abstract: 采用非平衡分子动力学方法(NEMD)研究了室温(300K)下厚度为2~32nm的单晶硅薄膜的沿膜平面方向的热导率,并使用Debye-Einstein模型对模拟温度进行了量子修正。模拟表明薄膜面向热导率小于相应的大体积值,并随膜厚度减小而减小,具有显著的尺寸效应。在模拟范围内膜面向热导率略大于其法向热导率;与声子气动力论的定性结果一致。晶体的表面弛豫和表面重构现象导致了MD模拟中体系总内能的升高。
单晶硅纳米薄膜面向导热MD研究的探讨
,
工程热物理学报 , 2004,
Abstract: 本文分析了经典分子动力学(MolecularDynamics)技术在模拟厚度在纳米量级的单晶硅薄膜平行于薄膜平面方向的热导率时出现的用难,指出精确计算薄膜表面附近处的原子运动状态对于单晶硅纳米薄膜面向热导率的分子动力学模拟具有重要意义,并在此基础上提出采用基于分子动力学和预处理共轭梯度法(PreconditionedconjugateGradients)的AbInitio方案模拟面向热导率。
基于分形理论的北京城市形态结构遥感分析
肖汉,
科技导报 , 2010,
Abstract: 城市形态结构分析对北京市的长远规划具有重要意义,运用分形思想规划城市对人居环境的改良和人地关系的协调也有着重要意义。本研究基于分形理论,运用GIS空间分析等方法,对北京城市形态结构和变化进行了定量的分析与评价,预测了北京市未来城市发展范围。利用TM遥感影像监督分类,提取1992、1999和2006年北京市建筑用地面积,以城市中心为圆心,取几十个半径递增的同心圆进行剪裁,得出各个同心圆内的城市建筑用地面积。通过反复试验确定双标度区并得到城市建筑用地面积折线图,并对面积进行基于乘幂关系的函数拟合,拟合优度R2≥0.995。并得到分维数D以及北京市范围及其变化。在得到这些数据后,进行了深入的分析以解释这些现象,同时对北京市与其他大城市的城市形态进行对比。最后,对北京市的城市建筑用地的未来发展以及可能出现的情况做出预测。
迭代生成微分方程分解方法研究 Decomposition method of iterated generating differential equation
康强,
- , 2017,
Abstract: 针对实际振动信号中多分量分离问题,在生成微分方程解调技术的基础上,提出一种新的迭代分解方法.首先采用生成微分方程(generating differential equation,GDE),估计初始振动信号的瞬时频率和幅值包络,然后对瞬时频率通过低通滤波分离出第一个频率,基于此频率对原始信号通过高通滤波器后提取的成分作为第一个分量,最后用初始信号减去第一个分量的余值作为下一次迭代的初始值,迭代同样的步骤分析分解直到获取所有信号分量,以低于能量比阈值作为迭代终止条件.本方法不需要先验信息.通过仿真信号验证并与传统方法进行对比分析,证明了方法的有效性.通过实测轴承试验信号的故障分析,证明了方法的实用性.
红松天然林胸径生长的空间异质性及其与地形的关系
,,,,
南京林业大学学报(自然科学版) , 2017, DOI: 10.3969/j.issn.1000-2006.2017.01.020
Abstract: 【目的】探讨红松天然林胸径生长的空间异质性及其与地形因子的关系,为科学管理经营红松天然林提供借鉴。【方法】通过采用地统计学、方差分析、地理加权回归等方法,对白河林业局的红松天然林胸径生长的空间异质性及其与海拔、坡位、坡向和坡度等地形因子的关系进行了研究。【结果】研究区内红松天然林胸径生长变异系数为0.6,属于中等变异性,其空间变异特征最适合用指数模型来描述,且模型拟合度高; 红松天然林胸径生长在0~4 230 m范围内存在强烈的空间自相关; 运用普通线性回归(OLS)与地理加权回归(GWR)方法建立基于地形因子的红松天然林胸径生长模型,预测结果显示,GWR方法较OLS方法提高了预测精度。【结论】红松天然林胸径生长在一定范围内具有较强空间异质性,且会因地形因子的变化而产生差异,其中海拔、坡向对胸径的生长影响较大。
【Objective】The spatial heterogeneity of DBH growth for natural Korean pine forests and its relationship with terrain factors were discussed for providing a basis for scientific management.【Method】Geo-statistical, variance analysis, geographically weighted regression and other methods were used to study the spatial heterogeneity of DBH growth for natural Korean pine forest and its relationships with altitude, slope position, slope orientation and slope gradient in Baihe Forestry Bureau.【Result】The coefficient of variation for DBH growth in natural Korean pine forest was 0.6, which belonged to moderate variability in the study area. The exponential model with highly fitting degree was the most suitable way for describing spatial variation characteristics. The spatial autocorrelation of spatial distribution of DBH growth in natural Korean pine forest was significant in the range of 0-4 230 m. The method of OLS and GWR were chosen to establish the DBH growth model for natural Korean pine forest based on terrain factors. The results showed that the prediction accuracy was improved by the GWR method compared to OLS method.【Conclusion】The spatial heterogeneity of DBH growth for natural Korean pine forest was significant and produced difference with the change of terrain factors. The change of altitude and slope orientation exerted greater influence on the DBH growth
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