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体外研究引流管大小对不同液体引流量的影响

中华急诊医学杂志 2014年第1期23卷 45-49页

作者：赵光锋徐正宽张茂巴立马岳峰浙江大学医学院附属第二医院急诊科杭州310009

目的通过体外基础研究探讨不同大小的引流管对不同性质液体的引流效果，确定能满足临床上胸腔引流需要的引流管大小。方法体外实验把1000mL30％血球压积的全血、2．5％白蛋白溶液、0．9％生理盐水分成A、B、C三组，分别用管径为6F（Fre... 详细信息

目的通过体外基础研究探讨不同大小的引流管对不同性质液体的引流效果，确定能满足临床上胸腔引流需要的引流管大小。方法体外实验把1000mL30％血球压积的全血、2．5％白蛋白溶液、0．9％生理盐水分成A、B、C三组，分别用管径为6F（French，F）、8F、10F、12F、14F、16F、18F、20F、22F、24F、26F、28F、30F、32F、34F、36F引流管进行重复引流，计算引流量。相同性质液体采用不同大小引流管的引流量之间的比较采用单因素方差分析，不同性质液体采用不同大小引流管的引流量之间的多重比较采用双因素方差分析，并遵照泊肃叶公式进行曲线拟合。结果三组液体的引流量与引流管大小成正相关，双因素方差分析中6F与8F引流管差异无统计学意义（P=0．513），其他大小引流管多重比较，差异有统计学意义（P〈0．05）；A组引流量数据单因素方差分析中，与引流量为3．33mL／min的对照值比较，6F和8F引流管引流量大于3．33mL／min，但差异无统计学意义（P〉0．05），10F及以上的引流管的引流量明显大于对照值（P〈0．05）。拟合曲线方程分别为：A组Q=o．0029X4，R2=0．991；B组Q=0．0032X4，R4=0．981；C组引流量Q=0．0034X4，R2=0．975。当Q=3．33时，A组引流量拟合曲线方程中X=5．82F。结论本基础实验研究提示小管径引流管（6F～14F）理论上可以满足临床上对血胸、渗出液及漏出液的引流。

关键词：引流管大小引流量泊肃叶定律曲线拟合方程

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春小麦籽粒灌浆期沉淀值动态的定量研究

作物学报 2006年第2期32卷 301-305页

作者：赵秀兰李文雄中国科学院大气物理研究所东亚区域气候-环境重点实验室/全球变化东亚区域中心北京100029 东北农业大学小麦研究室黑龙江哈尔滨150030

以3个不同品质类型春小麦品种为材料,在设定不同肥力和气象条件等环境因子基础上,通过建立灌浆期籽粒沉淀值动态曲线拟合方程,定量揭示籽粒沉淀值的动态与规律。结果表明,灌浆期籽粒沉淀值随时间的变化符合一元三次多项式凸性曲线,即自... 详细信息

以3个不同品质类型春小麦品种为材料,在设定不同肥力和气象条件等环境因子基础上,通过建立灌浆期籽粒沉淀值动态曲线拟合方程,定量揭示籽粒沉淀值的动态与规律。结果表明,灌浆期籽粒沉淀值随时间的变化符合一元三次多项式凸性曲线,即自开花始先增后降的单峰曲线。灌浆期籽粒沉淀值的动态,不同基因型具有不同特点。高蛋白强筋、高蛋白中筋和低蛋白弱筋品种曲线峰值分别出现在开花后28 d2、3 d和30 d前后。各品种沉淀值积累速度的动态特点是成熟时沉淀值高蛋白强筋品种最高,高蛋白中筋品种次之,低蛋白弱筋品种最低的主要原因。

关键词：春小麦籽粒沉淀值动态变化曲线拟合方程定量

Target reliability index for serviceability limit state of single piles

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Journal of Central South University 2015年第1期22卷 310-316页

作者：边晓亚郑俊杰徐志军章荣军 School of Civil Engineering & Mechanics Huazhong University of Science and Technology School of Civil Engineering and Architecture Henan University of Technology

The objective is to develop an approach for the determination of the target reliability index for serviceability limit state(SLS) of single piles. This contributes to conducting the SLS reliability-based design(RBD) of piles. Based on a two-parameter,hyperbolic curve-fitting equation describing the load-settlement relation of piles, the SLS model factor is defined. Then, taking into account the uncertainties of load-settlement model, load and bearing capacity of piles, the formula for computing the SLS reliability index(βsls) is obtained using the mean value first order second moment(MVFOSM) method. Meanwhile, the limit state function for conducting the SLS reliability analysis by the Monte Carlo simulation(MCS) method is established. These two methods are finally applied to determine the SLS target reliability index. Herein, the limiting tolerable settlement(slt) is treated as a random variable. For illustration, four load test databases from South Africa are compiled again to conduct reliability analysis and present the recommended target reliability indices. The results indicate that the MVFOSM method overestimates βsls compared to that computed by the MCS method. Besides, both factor of safety(FS) and slt are key factors influencing βsls, so the combination of FS and βsls is welcome to be used for the SLS reliability analysis of piles when slt is determined. For smaller slt, pile types and soils conditions have significant influence on the SLS target reliability indices; for larger slt, slt is the major factor having influence on the SLS target reliability indices. This proves that slt is the most key parameter for the determination of the SLS target reliability index.

关键词：极限状态函数可靠性指标单桩可靠性分析目标可靠指标曲线拟合方程蒙特卡罗模拟 SLS

呼和浩特市10种落叶阔叶乔木树种的绿量研究

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呼和浩特市10种落叶阔叶乔木树种的绿量研究

作者：梁晓琳内蒙古农业大学

学位级别：硕士

在呼和浩特市进行树木的绿量的测定,对呼和浩特市进行园林绿化树种的选择具有科学性的指导意义,精准的计算绿量值对呼和浩特市的绿化规划和绿地生态效益评价提供真实可靠的依据。元宝枫、梓树、槐、刺槐、臭椿等落叶阔叶乔木树种作为呼... 详细信息

在呼和浩特市进行树木的绿量的测定,对呼和浩特市进行园林绿化树种的选择具有科学性的指导意义,精准的计算绿量值对呼和浩特市的绿化规划和绿地生态效益评价提供真实可靠的依据。元宝枫、梓树、槐、刺槐、臭椿等落叶阔叶乔木树种作为呼和浩特市城市园林绿化的主要树种,对呼和浩特市城市绿化和改善园林生态环境起着重要的作用。对这些落叶阔叶乔木树种绿量的研究成为衡量它们生态效益的重要指标。绿量是评价城市园林绿地的指标,其能弥补城市园林绿地二维绿量指标的不足。本文通过介绍绿量的概念以及论述了研究绿量的目的与意义、绿量的应用。选择呼和浩特市园林绿化树种上应用最多、最广泛的、代表性强的10种落叶阔叶乔木树种为研究对象。10种落叶阔叶乔木树种分别为:元宝枫、梓树、槐、洋白蜡、丝棉木、刺槐、臭椿、山桃、火炬树、龙爪槐。根据选定的10种落叶阔叶乔木树种进行实地测量。确定了10种落叶阔叶乔木树种树冠的形状和公式及绿量的计算方法,通过对呼和浩特市10种落叶阔叶乔木树种的冠幅、胸径、树高等数据之间与绿量的相关性分析,得出与落叶阔叶乔木树种的绿量最相关的是冠幅和树高。依据绿量与冠幅和树高的相关性,建立了10种落叶阔叶乔木树种的绿量与冠幅的曲线拟合方程和绿量与冠幅和树高的二元线性回归方程。可根据实际需要选择合适的回归方程模型,如果对某一城市中某一绿地中的树种进行调查,可用绿量的最佳模型进行计算。如果是对某城市中大片绿地进行调查,可选择用精度较高的二元线性回归方程进行计算。

关键词：绿量落叶阔叶乔木树种曲线拟合方程城市绿地

Evaluating instrumented Charpy impact strain signals using curve fitting equations

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Journal of Central South University 2014年第2期21卷 600-609页

作者： M.B.Ali S.Abdullah M.Z.Nuawi A.K.Ariffin Z.M.Nopiah Department of Mechanical and Materials Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia Department of Structure and Material Faculty of Mechanical EngineeringUniversiti Teknikal Malaysia Melaka

An effective and simple way to develop equations from impact strain signals was *** research has been performed in this area,but this equation is very important for evaluating input signals in finite element analysis impact tests and for obtaining additional information on material deformation and fracture processes under impact *** this purpose,dynamic impact responses were examined through signals obtained from a strain gauge installed on an impact striker connected to a data acquisition *** 6061-T6 was used to extract strain responses on the striker during Charpy impact *** analysis was performed using the I-kaz method,and curve fitting equations based on the equation for vibration response under a non-periodic force were used to evaluate the Charpy impact *** I-kaz coefficients and curve fitting equations were then compared and discussed with related parameters,such as velocities and *** and thickness were found to be related to the strain signal patterns,curve fitting equations and I-kaz *** equations developed using this method had R2 values greater than 97.7%.Finally,the constructed equations were determined to be suitable for evaluating Charpy impact strain signal patterns and obtaining additional information on fracture processes under impact loading.

关键词：曲线拟合方程应变信号评估摆锤式仪器数据采集系统夏比冲击试验附加信息

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水位～流量关系曲线拟合实例分析

科技创新与应用 2015年第31期5卷 216-217页

作者：刘桂桂巩轶欧刘丙贺伊春水文局黑龙江伊春153000

文章以永翠河带岭站实测流量资料为例，对该站水位耀流量关系曲线进行了函数模型公式拟合分析。分别采用线性回归和一元图解分析的方法对该站2014年水位耀流量关系线进行了公式拟合，得出了拟合关系式并对不同关系类型函数进行了拟合精... 详细信息

文章以永翠河带岭站实测流量资料为例，对该站水位耀流量关系曲线进行了函数模型公式拟合分析。分别采用线性回归和一元图解分析的方法对该站2014年水位耀流量关系线进行了公式拟合，得出了拟合关系式并对不同关系类型函数进行了拟合精度对比分析，提出了计算机拟合曲线方程与人工定线推算流量的优缺点及实际工作中对拟合公式的使用建议。

关键词：永翠河带岭站水位~流量关系曲线曲线拟合方程人工定线对比分析

Measuring Carbon Dioxide Sink of Betung Bamboo （Dendrocallamus asper （Schult f.） Backer ex Heyne） by Sinusoidal Curves Fitting on Its Daily Photosynthesis Light Response

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Journal of Agricultural Science and Technology(B) 2012年第7期2卷 780-788页

作者： Effendi Tri Bahtiar Naresworo Nugroho Anne Carolina Aditya Chandra Maulana Forest Products Department Faculty of Forestry Bogor Agricultural University Campus IPB Darmaga Bogor Indonesia

Planting plant such as Betung bamboo (Dendrocalamus asper (Schult f.) Backer ex Heyne) is one of the best ways for reducing global warming effect. Betung bamboo is giant grass (Poaceae) which has been traditionally used by Indonesian people for construction material since a long time ago. Poaceae family commonly has better carbon sink ability than trees because of its C4 photosynthesis mechanisms, but bamboo sub-family (Bambusoideae) lacks the C4 photosynthetic pathway and anatomy. In the absence of this feature the maximum possible productivity of bamboos is unlikely to greatly exceed that of other bioenergy crops with C3 photosynthesis such as fast growing tree species. This research proposed a sinusoidal equation as a basic equation for plant"s daily photosynthesis light response curve fitting. The sinusoidal equation was success for Betung bamboo"s daily photosynthesis light response curve fitting (R2 > 60%). It had similar result in estimating carbon sink (82.35 kg/clump/year) compared to those which calculated by annual increment (69.01-107.82 kg/clump/year). It is better to choose sinusoidal equation than quadratic or cubic. Betung bamboo is a good choice to be planted in order to resist the global warming effect because it has superior carbon sink capability (82.35 kg/clump/year) than slow growing tree, and equal to fast growing tree species, besides many other advantages.

关键词：曲线拟合方程光合作用正弦公式光响应 CO2 测量全球变暖建设材料

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F河A段综合水质评价和预警指标

F河A段综合水质评价和预警指标