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自古以来人类为了探索生物体衰老的奥秘,已经开展了大量的研究,但是至今人类为什么会衰老,如何抵御衰老进程,依然是人们关注的永恒话题。而富足的生活和文明程度的提高,也为抗衰老化妆品市场的拓展提供了巨大的空间。  相似文献   
2.
本文针对四川某一电站土石坝工程的心墙料——冰碛土进行了一系列的试验研究。研究表明:随着围压力的升高,冰碛土的强度降低,强度包线为折线型式;平面应变的试验强度高于常规三轴的试验强度,文中提出了二者的转化关系式。  相似文献   
3.
夜光的本质与夜明珠千古之谜的揭开   总被引:6,自引:0,他引:6  
王春云 《珠宝科技》2004,16(3):43-49
夜明珠之谜在中华文明、印度文明、希腊文明、罗马文明、犹太文明和日本文明中都存在,但迄今为止仍是一个世界性的难题和一个人类文明史上的未解之谜。通过回顾夜明珠的理论研究现状,指出夜明珠夜光的本质不是传统所谓磷光,而是指巨粒金刚石熠熠闪光和自然出火的光学性质,是金刚石对于白光折射、反射、全反射和色散等综合作用的结果;同时通过比较矿物的光学性质,得出夜明珠的本质就是自然出火的、具有曲面形或似球形的巨粒金刚石,而不是光学性质与金刚石类似的锆石、金红石、石榴石,也不是折光率和色散系数明显低于金刚石的其它宝石、工艺石材、料珠或者珍珠。夜明珠千古之谜的揭开表明夜明珠可以成为中国古代历史文献记载中指称巨粒金刚石的标志矿物或者指纹矿物。  相似文献   
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Comments on the article Fundamentalism: Sauce for the goose by K. Floyd (see record 2007-09680-001). Floyd reminds us that the application of a little logic to the propositions we claim are true can sometimes show us that our beliefs are untenable, and that such a finding "could turn out to be very freeing indeed". In particular, he uses one of the arguments some of us struggled with the first time we met logic as a discipline: If P is true then Q is true. Q isn't true. Therefore, P isn't true. Floyd applies this principle to religious belief: If I believe that P is true and Q is true when in fact P implies that 0 is false then I am truly inconsistent! He also shows how easily we are willing to use such logic on the beliefs of others but not on our own beliefs. The current authors' attempt to demonstrate that Floyd makes several questionable steps in his reasoning, thereby calling into question the conclusions he draws. Floyd has sought to point out the lack of thought behind numerous religious beliefs. The current authors accept this general observation, but they believe it unfair to attribute this difficulty only to religious beliefs. The difficulty with religious beliefs is not that they are not concerned with truth vs. non-truth, but rather that for a number of reasons, the difference between these two poles is often not obvious. The question of the validity of religious beliefs is a philosophically spiny one that has been addressed, sometimes adequately and sometimes in very illogical, emotional and violent fashions, for thousands of years. It seems obvious to the authors that "three minutes thought" is not sufficient to untangle such an issue. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
5.
从文化遗产的原真性原则和横店圆明新园项目方的公开发言出发,论证横店项目是一个主题公园项目,而非文物建筑的重建。苏实的文章对梁思成先生关于中国文物建筑不求原物长存总结的理解存在方向性错误,苏文以横店项目为一些‘假古董’正名的立论存在诸多不当之处。  相似文献   
6.
王园 《建筑与环境》2009,3(2):194-195
本文通过对历史各时期建筑审关原则的比较.引发出“试图建立一种普世美学理论是否是一种错误观念”的设问,得出任何美学的原则只有放在时代技术的语境下才发生意义的结论。应该根据不同的技术条件,探讨不同时代的美学原则。  相似文献   
7.
1996年我们发现,如果能实现酸?碱?盐闭路化学循环,则化工清洁生产就能达到零排放。从此开始了盐水解法酸碱联产新化工单元的研究。2012年提出了“动态多相动力学封闭系统”理论,发现这是非平衡热力学中的第三类“熵致有序”结构。将这一理论推广至太阳系,发现了“熵循环流”与“宇宙永动机”,还给出了时间新定义。  相似文献   
8.
王锡法 《煤矿机械》2006,27(10):163-164
通过长运距、大运量带式输送机常用软起动的结构、性能分析,总结了常用软起动的选用原则,提出了长运距、大运量带式输送机软起动优先选用方案。  相似文献   
9.
Aimed at the problem that the traditional ART-2 neural network can not recognize a gradually changing course, an eternal term memory (ETM) vector is introduced into ART-2 to simulate the function of human brain, i.e. the deep remembrance for the initial impression.. The eternal term memory vector is determined only by the initial vector that establishes category neuron node and is used to keep the remembrance for this vector for ever. Two times of vigilance algorithm are put forward, and the posterior input vector must first pass the first vigilance of this eternal term memory vector, only succeeded has it the qualification to begin the second vigilance of long term memory vector. The long term memory vector can be revised only when both of the vigilances are passed. Results of recognition examples show that the improved ART-2 overcomes the defect of traditional ART-2 and can recognize a gradually changing course effectively.  相似文献   
10.
Ákos Moravánszky explains why for him ‘the traces of Mediterranean Rationalism in the new Swiss-German architecture are like the imitation stitching on the moulded plastic dashboard of a new car’. It is an influence which, despite the undeniable impact of Aldo Rossi and the Ticino School at ETH Zurich in the 1970s, remains skin-deep, sharing little with the present in terms of ideology or the interpretation of the historic past. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   
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