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In first, a new short time formula of one dimension heat conduction differential equation, based on the theory of one dimension transient method, is presented for thermophysical property measurement of wood. The result of testing on red pine and larch wood arc satisfied by new method.In succession, the relationship between heat conductivity of wood and moisture, density, porosity, temperature and grain is studied experimentally in the range from 25 to 100℃. The result shows that, the heat conductivity is in direct proportion to density. but in inverse proportion to porosity. The heat conductivity of air-dried wood increased probably linear with the temperature rising. And that heat conductivity along the grain of wood is higher than that cross the grain. The former is 1.8 or 2 times of the latter.

文中研究了25~100℃范围内,气干木材的导热系数与含水率、密度、孔隙率、温度及热流方向的关系,研究表明:木材导热系数与密度成正比关系,与孔隙率成反比关系:对于针叶材,导热系数与密度及孔隙率成线性变化关系,而对于阔叶材其变化关系近似成二次曲线;气干木材的导热系数随着温度的升高近似呈线性增加:热流平行于纹理方向的导热系数大于垂直于纹理方向的导热系数,两者的比值大约在1.8~2之间。

Density, scale, thickness are still influencing the anemones shape.

密度、大小、厚度是受最原始的那股海葵的影响。

With the Olympic Game comes, from the angle of color and design, Enhance the study of Art Gymnastics costume's colourway should be became an important work to contract the distance between our country and the west countries. Art Gymnastics ; costume ; harmony ; color

艺术体操在我国属于一项年轻运动,随着2008年北京奥运会的临近,作为奥运会女子比赛项目,中国艺术体操要缩小与国际艺术体操强国的差距,不仅要进一步加强成套动作的难度、密度、编排和时间的利用等技术问题,同时也要注意进一步提高艺术体操运动的艺术性及美感等因素,包括艺术体操服装的色彩、设计、装饰及器械、场

This study selected the ephemerals which grow in the Gurbantunggut Desert Area as the object of the study, which is based on the field sampling and the bourgeoning experiment in laboratory, The distributing , bourgeoning status,density, diversity of the soil seed banks and its relationship with vegetation showed in this area sand dunes were studied.

采用野外定点取样和室内萌发相结合的试验方法,研究了短命植物在沙丘不同部位的空间分布、萌发状况、密度、物种多样性及土壤种子库生物多样性与地上植物多样性的关系。

Converter Pro comes with a database that contains the most important conversion factors to convert length, area, volume, mass, force, pressure, density, energy, power, temperature, dynamic viscosity, kinematic viscosity and time units and optionally, also with practically all of the less used or historical units.

转换器Pro预装了一个数据库,其中包含最重要的转换系数转换长度,面积,体积,质量,力,压力,密度,能源,电力,温度,动力粘度,运动粘度和时间单位和选择性,还与几乎所有的少用或历史单位。

Converter Pro comes with a database that contains the most important conversion factors to convert length, area, volume, mass, force, pressure, density, energy, power, temperature, dynamic viscosity, kinematic viscosity and time units and optionally, also with practically all of the less used or historical units.

转炉亲配备了一个数据库,包含了最重要的换算系数转换长度,面积,体积,质量,力,压力,密度,能源,电力,温度,动力黏度,运动黏度和时间单位,并可选同时,几乎所有的少用或历史单位。

After four months of observation of the growth season, the author reveals in the thesis the day- and month-dynamic characteristics of the net photosynthetic rate of Dahurian Larches, which are of different ages, densities and stand classes. The author also compared the net photosynthetic rates of the leaves on different-age braches and with the crowns of different layers and directions. In addition, the author analyzed the effects of some ecological factors on net photosynthetic rate as well.

通过生长季节四个月的定株观测,揭示兴安落叶松的光合特征,即不同年龄、密度、分级木净光合速率的日动态和月动态特征,比较树冠不同层次、不同方向和不同枝龄上针叶的净光合速率的日动态和月动态特征,分析光照强度、温度、CO2浓度等生态因子对兴安落叶松净光合速率的影响。

The dynamic behaviour of copper was investgated making use of an ex-perimental Lagrangian analysis technique,in which multiple manganin gauges were used to measure the stress-time history at different Lagrangian positions in the stress wave field,and a modified pathline method was used to analyse and solve the dynamic and physical parameters of the flow field.

利用拉氏分析方法对钨合金在高应变率下的力学性质进行探讨,分析各拉氏位置的应变,比容,密度,应变率,比内能,质点速度等物理量的变化历史,讨论不同晶粒度尺寸对钨合金在高应变率下动态力学性能的影响,给出钨合金在应变率为104~105s-1时的应力应变曲线。

Density The mass Of liquid per unit Of volume Of substance at 15℃.

密度 在15℃的温度条件下,单位体积的某种物质所具有的液体质量。

Density The mass Of liquid per unit Of volume Of substance at 15℃.

密度 在15℃的温度测试仪条件下,单位体积的某种物质所具有的液体质量。

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Hanna: That's over now, isn't it?

都结束了,对吗

You must be ill. You look so pale.

你一定是病了,你的脸色苍白。

After proper differential delay, an UWB monocycle pulse with 84-ps width and the fractional bandwidth of 153% is generated after photodetection.

两个高斯脉冲经过适当的延时,光电检测后产生超宽带单周期脉冲,其脉冲宽度为84ps,相对带宽为153%。