时间价值

Thickened interlobular septa'looking as the "crazy-paving"'was found in 4 cases in high-resolution CT'correspondence with edema and lymphocyte exudation in interlobular septa in pathological findings.No mediastinal and hilar adenopathy was found. Conclusion The characteristic appearances of PAP on MSCT correspond to its pathological features.

多层CT的问世，使单次屏气时间内完成高质量的全肺薄层扫描成为现实，极大提高了图像的时间和空间分辨率，胸部高分辨率CT还能清晰显示次级肺小叶为单位的肺内细微结构，极大提高了CT在肺部疾病诊断中的应用价值。

This experiment was designed to study the influence of various levels of urea, moisture and reaction time on the nutrition value of rice straw ammoniated, so as to determine the optimal parameters of urea, moisture and time of ammoniation .

中文摘要：本试验旨在研究尿素添加水平、水分含量、时间对氨化秸秆营养价值的影响，以确定氨化稻草秸秆尿素、水分、时间处理参数的优化组合。

The basic approach of protecting people from being hurt or killed in an accident is to improve crashworthiness of vehicles. This paper starts with discussing theories and methods for vehicle passive safety design, which included experiential methods, analytic methods, multi-body dynamics methods, crash test methods and the finite element method. Emphasis will be paid to the basic FEM theories and algorithms of impact problems. Topics discussed include the governing equation, element discretization, hourglass control, time integration, material model, shell element algorithms and contact-impact algorithms. For more reliable simulation results, this paper then conducts study on how to accurately get material model parameters by combining the FEM method with experimental method, and develops relevant material test machine and parameter calculating software. Based on that, basic typical impact simulation and test validation study are conducted. On the basis of the above work, the paper studies the thin-shell structures'crashworthiness, which was affected by the following factors: spot-weld features, shell thickness, cross-section and pre-deformation. As to vehicle parts'crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system. A practical energy-absorbing steering wheel is designed as an example. In further depth research, the paper suggests several inverse quantificational methods for vehicle crashworthiness design based on the ideal crash characteristics. The above theories and methods are applied with good results through several practical vehicles' crashworthiness design and improvement.

文中对汽车碰撞安全性的设计理论和方法进行了归类和总结，其中包括经验法、解析法、多刚体动力学法、试验法以及有限元方法等；重点介绍了碰撞有限元法的基本理论和有关算法，涉及到有限元求解控制方程、单元离散、沙漏模态控制、时间积分、材料模型和应力修正、薄壳单元算法以及接触碰撞界面算法等，探讨了有限元计算中的材料模型参数获取技术，开发了相应的材料试验装置及材料模型参数反求软件，在此基础上进行了基本的碰撞仿真算例和试验对比研究；文中通过应用有限元方法研究了薄壁构件的碰撞吸能特性，指出了设计薄壁吸能构件时需要考虑的几个主要影响因素，即焊点、壁厚、横截面和预变形等；在关于车辆部件的碰撞安全性能设计中进行了吸能转向机构和自适应安全气囊的仿真研究，提出了吸能转向机构和自适应安全气囊的仿真研究方法；文中最后探讨了整车碰撞性能的设计与改进方法，提出了以理想碰撞特性为目标，采用分段加速度或者根据碰撞时间进行设计的反推设计法、部件吸能仿真优化设计法等量化设计方法，并通过综合应用文中所讨论的相关技术进行了整车碰撞性能的设计与改进实例研究，所选定的车型是大众化的普通轿车和碰撞安全性基础较差的微型面包车，研究结果表明，本文所提出的设计与改进方法是适用而有效的，具有重要的工程实用意义和价值。

This paper criticizes some theories about value of natural resources, explains the value of forest resources with Marx's labor axiology,thinks that the value is determined by the labor-time in socially necessary on utilized the worst woodland which based social wants in process of reproduction of forest resources,not by the total price of various use value.It puts forward that the value of a use value of forest resources is a compensation of stated value of forest resources on this use value,and its compens...

该文批判了西方有关自然资源的效用论、地租论和传统马克思主义经济学中的无价论、实用论，运用马克思劳动价值论解释森林资源的价值，认为其价值量决定是由森林资源再生产中已利用的最差等级林地的以社会需要为基础的社会必要劳动时间决定的，而不是森林各种使用价值的加总，各种使用价值的价值量是一定的森林资源价值量在该使用价值上的分摊量，其价值补偿是成本补偿而不是效益补偿。

The reduction of the value of an asset by prorating its cost over a period of years.

经过一段时间的价值分摊来降低资产价值的行为。

Of the value of an asset by prorating its cost ''.

经过一段时间的价值分摊来降低资产价值的行为。

In the age of fierce competition in economy and integrated national Power, great attentionshould also be paid to the research in the social and educational vaLue of the education of history. Thecharateristics of the education of history in developed countries,such as the United Stales.

在激烈的经济竞争和综合国力竞争的时代，仍应重视历史教育的社会价值和教育价值的研究、美国、日本等发达国家中学历史教育的特点是：课程设置稳定、教学时间长、重视本国史和科技文化史的学习、注重历史教育同国情教育的有机结合。

Determined by MBTF in good faith; discounting each settlement amount then due to present value at the time of close-out to

市场的价格与外汇和约的和约价值之间的差值；(2 )将结算费用从目前的价值中扣除（考虑到关闭日期和到期日期之间这段时间内

This paper is conducted with time passing, researching into the different valueorientations in different stages of modern times. The main content is as follow: In the period of Westernization Movement, with the policy of "self-strong" and"reach to rich", the higher education oriented to the political and economical value.

本文按中国近现代这一时期中不同时间发展阶段为线索，分析了不同历史阶段高等教育不同价值取向：洋务运动时期，在洋务派&自强&、&求富&的口号下，高等教育为求民族独立与富强而以政治经济为价值取向。

Synthesizing the two connations, Marx advanced that leisure is a question of creating, possessing and using free-time, leisure is an important form of value being and actualization, and persons generating process to freedom and all-round development, too.

综合这两方面的规定，马克思提出，休闲就是个人对自由时间的创造、占有和使用，是人的价值存在和价值实现的重要形式，是现实的个人不断地向自由而全面发展的人的生成过程。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

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。