查询词典 conservation

The goal of this study was to compare long-term health outcomes and mortality after oophorectomy or ovarian conservation in 29,380 women participants of the Nurses' Health Study who had a hysterectomy for benign disease. Of these, 16,345 (55.6%) had hysterectomy with bilateral oophorectomy, and 13,035 (44.4%) had hysterectomy with ovarian conservation.

这项研究的目的在於比较卵巢切除术或是卵巢保留，对参与护理人员健康研究之29，380位因良性原因切除子宫之女性的影响；在这些病患中，16，345位（55.6%）接受子宫摘除与双侧卵巢切除，而13，035位（44.4%）接受子宫摘除与卵巢保留。

The main contributions include:(1) Energy conservation law of Haar wavelets transform is proved to compress data streams.(2) The relation between the coincidence measure and trend of streams is revealed as along with the invariability under parallel shift and the equivalence law over coincidence measure to approximately express data-streams by the wavelet coefficient of the characteristic stream and its energy.(3) Multi-Scales energy decomposition model is proposed to improve the compression precision.(4) The multi-scales compression algorithm and the energy conservation reconstruction algorithm are designed.(5) Extended experiments show that the compression ratio of the new methods is 2~4 times as the traditional method.

主要研究成果包括：(1)证明了Haar小波变换服从能量守恒规律，并用于压缩数据流；(2)揭示了数据流的偶合度与变化趋势的相关性、偶合度的平移不变性及等价规律，采用特征流序列的小波系数和流能量近似表示流的趋势，达到压缩的目的；(3)提出了多尺度能量分解模型，提高了表示精度；(4)设计了多尺度能量分解压缩算法以及多尺度重构算法；(5)在真实数据集上的实验表明，新方法的压缩比是传统小波方法的2～4倍。

On the basis of the conservation equation of continuous medium and in combination with mechanics of fluid through porous media and the heat transfer theory in porous media, conservation equations in porous media (continuous equation, momentum equation and energy equation ) are derived, When constructing the downhole temperature model, heat transfer in a wellbore is considered as the heat transfer in a vertical tube, the flow in a wellbore considered as sufficiently parallel flow, heat transfer in injection zones considered as heat conduction and convection in porous media, the flow in injection zones considered as flow through porous media, heat transfer in adjacent rocks considered as heat conduction in porous media.

在建立井下温度场模型时，把井筒的传热看作是竖直圆管中传热问题，把井筒的流动看作是充分发展的层流流动；把注入层中的传热看作是多孔介质中导热和对流的传热问题，把注入层中的流动看作是渗流；把围岩中的传热看作是多孔介质中导热问题。

Conservation genetics is a new field of research focusing on the studies and practices of biodiversity conservation based on the principles and techniques of population genetics.

保护遗传学是运用遗传学的原理和研究手段，以生物多样性尤其是遗传多样性的研究和保护为核心的一门新兴学科。

In the article, the question is researched whether heritage is a prime element in local community identity and whether local identity creates a level of support for conservation or a conservation reflex among the local inhabitants.

但是目前这种交流的客观事实或性质以及历史维度在遗产保护中并没有给予足够的重视。

The main contents include the ray phenomenon and its generation conditions; the deduction and physical illumination of wave action conservation equation and wave number conservation equation; ray theory for sinusoidal waves; Fermat's principle; the variation of amplitude in the case of straight and parallel depth contours and circular depth contours; the amplitude near the caustics; wave trapping; deduction of mild-slope equation and the relevant numerical solution methods.

讲授折射现象及其发生的条件；波作用守恒方程和波数守恒方程的推导及物理解释；稳恒正弦波的控制方程及射线方程；费马原理；利用射线方程研究等深线是平行直线和圆周线时波振幅的变化，特别是焦散线附近波高的变化以及由此而产生的波的俘获；缓坡方程的推导及有关的数值求解方法。

In general, the decline of American Laissez-faire at the end of nineteenth century, conservation movement and the dream that Progressionist searching for rebuilding Safety valve of West are the reasons The National Reference policy not only exert a great influence on west conservation and deep economic exploitation, but also on the administration power of federal government expansion.

总的说来，美国发展西部灌溉政策由自由放任向国家干预的转变经历了一个漫长的时期。

This component will develop grazing systems and rangeland conservation technology to demonstrate the production and conservation benefits planned grazing management.

这个分项目要建立放牧制度和草场保护技术，示范在这个放牧管理制度下的生产和保护效益。

In order to get rid of some existing shortcomings of the conservation scalar quantity method, it was simplified under the precondition that the law of the physical conservation was being observed.

笔者针对守恒标量法的某些缺点，在遵守物理守恒定律的前提下，对其进行简化。

And, on this basis, the VC++ language was used to program the computer. The computerized example was compared with the practical test, and the result showed that the simplification made to the conservation scalar quantity method is feasible on the whole, and compared with the original conservation scalar quantity method, the simplified method has the advantages that programming is more simple, and calculation time can be shortened.

在此基础上，用VC++语言进行编程，将计算后的实例与实际的试验对比验证，结果表明：对守恒标量法所作的简化基本可行，与原来的守恒标量法比较，简化后的编程简单，计算时间缩短。

It's not quite as simple as that.

并没有那么容易。

It debuted in 1992 in Japan and the United Kingdom, and 1993 in the United States.

它首次亮相于1992年在日本和英国，在美国1993年。