用鲑鱼的命换我们的美丽?     

吉利·阿多拉  新明 《海洋世界》2003,(5)

在芝加哥,有一位名叫拉姆的女士是化妆品推销员。每天的午饭,必定会有大马哈鱼(即鲑鱼)下肚。将鲑鱼身上涂抹少许奶油,再放到烤炉里不断调节电磁热辐射量,很快就能烹饪出味美色香的精制鲑鱼。拉姆说, “根据补充营养的标准,鲑鱼肉能使人返老还童。”而且她一直在实践鲑鱼的美容效果。由鲑鱼的价值连城而引发  相似文献   

国际构造图:四十年的道路     

V·E·哈因  王秉贤 《青海国土经略》1996,(2)

本文回顾了国际构造图的创意及编制历史,揭示了该项工作对地质科学发展的重要性。它既反映了关于地球演化观念之变化,也反映了固定论地槽—造山带—地台说为活动论板块构造理论所取代的过程。 早在18世纪就有了编制地质图的最初尝试,但基本上是没有时代概念的岩性图。19世纪初,随着真正地质图的出现,地质学才真正成为科学。然而,普通地质图不能充分反映地壳构造  相似文献   

对称丘陵背风区自然降尘特征     

德克·戈斯勒  杜忠潮 《地理科学进展》1990,9(3):23-25

本文报导研究细粒粉尘物质(黄地)在对称丘陵背风区沉降特征的风洞实验。注意力集中于黄土顺风越过丘陵的沉积模式是否具有波动的问题(可与著名的Karman 涡旋尾流相比较)。实验结果表明,虽然再生沉积的最大值出现在紧接丘陵背风坡的下游一带,却未见沉积尾流。  相似文献   

日本在测地学和地球动力学中空间技术的应用     

Kato  T 徐桂华 《地震科技情报》1997,(2):10-25

日本和世界其他国家都已在测地学和地球动力学研究中引进使用ＶＬＢＩ，ＳＬＲ和ＧＰＳ。扼要综述日本近年来有关这些技术对应用方面的各种活动。ＶＬＢＩ和ＳＬＲ主要是应用在国际性实验方面。  相似文献   

在世界包围中的新西兰农业:当今政策的调整     

R.W.M.约翰森  李柱臣 《地理科学进展》1991,10(3):35-39

在这篇文章里,我研究了十九世纪世界贸易和殖民扩展中的新西兰农业发展,继而研究了导致农业出口依赖于世界贸易、技术和动力平衡所出现的经济过程。我调查了农业(1963—1984年)近期的竞争,以及转向调整和出现二十世纪经济和剩余农业的含意。  相似文献   

On the Spectral Index－Flux Density Relation for Large Samples of Radio Sources     

W.Reich  P.Reich  R.Wielebinski 《中国天文和天体物理学报》2003,3(4):347-358

We present new statistical results on the spectral index-flux density relation for large samples of radio sources using archival data of the most sensitive surveys, such as 6C, Miyun, WENSS, B3, NVSS, GB87. Instrumental selection effects and the completeness of the catalogs are discussed. Based on the spectral indices calculated for about 200 000 sources from the WENSS (327 MHz) and NVSS (1.4 GHz) catalogs, we obtained (1) The median spectral index increases from amed --0.9 toαmed --0.8 (Svαvα), while S327 flux densities decrease from 0.1 Jy down to 25mJy. The median spectral indices nearly show no variation within the error bars when the flux density is larger than 0.1 Jy. (2) A dependence of the fraction of ultra-steep spectrum sources (USS, -1.5 <α<-1.0), steep spectrum sources (SSS, -1.0 <α< -0.5) and flat spectrum sources (FSS, -0.5≤α≤0.0) is partly responsible for the spectral flattening. Another contribution to the spectral flattening comes from the variation of αmed of steep spectrum so  相似文献   

New Developments in Water Efficiency     

Tony T. Gregg Amanda Dewees Drema Gross Bill Hoffman Dan Strub Matt Watson 《中国海洋大学学报(英文版)》2006,5(4):375-380

1Water LossInitiativesUnaccounted-for water(or unbilled water)has beenreceiving newscrutiny at both the state and nationallevels.For years,water conservationeffortsin Europehave emphasized reduction in water loss to a muchgreater extent thaninthe United S…  相似文献   

科学技术进步和现代经济地理学的方法论问题     

T.M.卡拉什尼科娃  李德美 《地理科学进展》1985,4(4):8-12

现在正是科学技术高速发展的时期,它必然引起劳动地域分工和生产地域组织的变化。研究经济问题的所有学科的研究对象也因而随着变化。促成这些变化的经济因素是。生产系统和非生产系统的形成;生产和非生产领域的高速发展;生产集中和地域集中;引用新工艺和新的劳动手段.  相似文献   

Life's origin: the cosmic, planetary and biological processes     

Scattergood T  Des Marais D  Jahnke L 《The Planetary report》1987,7(6):4-5

From elements formed in interstellar furnaces to humans peering back at the stars, the evolution of life has been a long, intricate and perhaps inevitable process. Life as we know it requires a planet orbiting a star at just the right distance so that water can exist in liquid form. It needs a rich supply of chemicals and energy sources. On Earth, the combination of chemistry and energy generated molecules that evolved ways of replicating themselves and of passing information from one generation to the next. Thus, the thread of life began. This chart traces the thread, maintained by DNA molecules for much of its history, as it weaves its way through the primitive oceans, gaining strength and diversity along the way. Organisms eventually moved onto the land, where advanced forms, including humans, ultimately arose. Finally, assisted by a technology of its own making, life has reached back out into space to understand its own origins, to expand into new realms, and to seek other living threads in the cosmos.  相似文献   

Time travel and chemical evolution: a look at the outer solar system     

Owen T 《The Planetary report》1987,7(6):16-18

Many space scientists think that the chemical conditions today on planets and moons of the outer solar system are similar to conditions on Earth soon after it formed. If so, we can learn much about the chemistry that led to life on this planet. We can also speculate about exotic habitats that might have given rise to other types of life. And if we are able to discern the chemical reactions now occurring in the outer solar system, we may be able to extrapolate these rules to other solar systems, and so define the habitable zones around other stars where the potential for life is high.  相似文献