中项
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Firstly, based on the method of pressure-velocity coupling introduced by SIMPLE algorithm and a revised method of solving the unsteady equation of stream function and vorticity on uniform grid, a special algorithm called primitive-variable-time-dependent approach is formed in the present study. In this algorithm the Navier-Stokes equation in primitive variable form is solved by using the time-dependent approach on non-uniform staggered grid system. The second-order accuracy finite difference is used for the first and second partial derivatives of all variables of the convective terms and diffusion terms.
首先,本文在SIMPLE算法系列处理速度与压力耦合问题的思路和均匀网格下改进的关于流函数涡量方程的数值求解方法的基础上,将非定常原始变量Navier-Stokes方程的求解推广至非等距交错网格剖分,形成了具有本文特色的原始变量时间推进方法,其中对流项和扩散项中各变量的各阶导数均采用二阶精度公式,包括温度在内的离散方程组采用ADI迭代方法求解。
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objective to determine the menarche age among female students and the relation between body fat and menarche in anhui province to provide theoretical basis for adopting intervention measure and carrying out health education.methods probability unit regression were used to calculate mmas in 3 000 girls aged 9~18 years old,who were selected from 3 areas in 2005.results mmas were 12.76 and 13.11 years old for urban and rural girls respectively.the youngest age was 10.the menarche age was significantly,related with bmi sebum thickness of abdomen,sebum thickness of shoulder blade and the upper arm.conclusion there was significant relationship between menarche age and body fat.menarche age showed an ahead trend in han national students in anhui province.sex eduction should be conducted in advance,and it was important to strengthen sex education in adolescent.
目的 了解安徽省女生月经初潮及初潮前后体脂变化情况,为采取干预措施和健康教育提供理论依据。方法按照2005年全国学生体质调研要求,采用分层整群抽样方法,对安徽省南、中、北3个地区城乡9~18岁中小学女生3000人进行调查,并测量体质指数、腹部皮脂厚度、上臂皮脂厚度和肩胛下皮脂厚度4项指标。结果城市女生半数月经初潮平均年龄为12.76岁,农村女生13.11岁,城乡最小月经初潮年龄均为10岁。体质指数、腹部皮脂厚度、上臂皮脂厚度和肩胛下皮脂厚度4项指标均值来潮组均大于未来潮组,差异有统计学意义,p.01。结论月经初潮年龄与体脂因素关系密切;安徽省汉族学生月经初潮年龄呈现提前趋势,性教育应提前,加强青春期性教育尤为重要。
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Table tennis general elective course in PE institute needs 4 essential techniques(palm-down quick push, palm-up attack, left push and right attack, palm-down slow chopping),arrange the 4 techniques may form 24 program, select 8 programs in teaching.
体育院校乒乓球普修课中需要进行4项主要基本技术(即反手快推、正手攻球、左推右攻、反手慢搓)的教学。将这4项技术进行排列组合,可形成24种程序,内有8种为可执行性教学程序。
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At least half of participants who were in the top quintile of glucose homeostasis variables in childhood were above the 60th percentile for these variables in adulthood.
在儿童血糖恒定变项四分位数最高的受试者中,至少有一半在成人时,这些变项超过所有受试者的60%以上。
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The noninformative prior of the standard deviation of error terms was introduced for Bayesian analysis. Then, given the prior density of the random coefficients in the degradation path model, the Markov Chain Monte Carlo method was adopted to generate samples of joint posterior distribution of random coefficients and unknown standard deviation.
为了处理未知的误差项方差,引入相应的标准差的无信息先验分布,并进一步结合退化轨道模型中随性参数的先验分布,利用马尔可夫链蒙特卡罗方法得到随机参数及误差项标准差的联合后验分布的采样值,进而实时预测产品在未来一段时间内的可靠度。
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The learning algorithm utilizes shape functions to approximate influence functions in integral transforms and estimate the control input to reduce repetitive error.
学习法则的补偿项是使用形状函数来趋近积分项中的影响函数,并且估测控制输入。
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This paper analyses the National Treatment of foreign investment on the base of jurisprudence as the followings: The legal value of National Treatment is to secure non-discrimination and farsightedness, to create a relatively fair play field for the residenter and the foreigner in order to realize the liberalization of trade and investment.
本文结合这些问题从以下几方面对外资的国民待遇进行了基础性的法理分析:国民待遇的法律价值在于保障非歧视性和可预见性,为内资与外资创造一个相对公平的竞争环境,实现贸易与投资的自由化;它尚未发展成为一项如某些西方学者鼓吹的普遍性的国际义务,不管从事实上还是法律上,其都具有相对性与非义务性,是否给予外资国民待遇是一国的经济主权;国民待遇包含四项法律要素:客体、主题事项、参照规则和参照对象;超国民待遇具有合理合法性,在我国亦有其存在的必然性,不应一概取消,并且,从法理上讲,国民待遇涵盖了超国民待遇与差别待遇;《TRIMs协议》中的国民待遇在法律性质上仍属货物贸易的国民待遇,但具有授予外资国民待遇的效果,然而何种TRIMs应受其管辖,在国际上争议较大;GATS的国民待遇属具体承诺性质,它仅指外资进入东道国市场后的待遇,并且不只限于形式上的平等,更要求实质上的平等。
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It was found that the residual pulsant Reynolds stress term of coherent structures has the same order of magnitude with the Reynolds stress contribution term of random fluctuation and can not be ignored in the dynamic model of coherent structures. This is not as that estimated before.
研究发现,相干结构剩余脉动雷诺应力项在数值上具有和随机脉动对相干结构贡献的雷诺应力相同的数量级,表明在相干结构动力学模型方程中,相干结构剩余脉动雷诺应力项并不像以前佑计的那样可以忽略不计。
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The residual pulsant Reynolds stress term of coherent structures was compared quantitatively with the Reynolds stress contribution term of random fluctuation based on theoretical analysis.
基于理论上对湍流相干结构动量方程中随机脉动对相干结构贡献的雷诺应力和相干结构剩余脉动雷诺应力项的分析,对两种雷诺应力项进行了对比研究。
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In a 1964 study, Jules Maserman and his colleagues ran a different experiment, again with rhesus monkeys.
在1964年的一项研究中,朱尔斯·梅瑟曼和他的同事们进行了一项不同的实验,这次也是用恒河猴来做的。
- 推荐网络例句
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The split between the two groups can hardly be papered over.
这两个团体间的分歧难以掩饰。
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This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.
这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。
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The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.
聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力