几何法在解析AB和ABX系核磁共振波谱中的应用

本文介绍解析AB系的几何法,避免了计算手续。仿此,具备ab亚谱的其他谱系可相应地简化。ABX系有两组不同参数,常用数学计算来选择,几何法只需找角度或线段关系,无需任何运算,较直观简捷。此外,给定化学位移v_A、v_B及偶合常数J_(AB)、J_(AX)、J_(UX)条件下,可用几何法做ABX系理论波谱。     

解析打鼾

打鼾,俗称打呼噜。许多人睡眠时都会打鼾,这本不是什么大不了的事,但一些人睡眠时持续地发出很大的鼾声,就应该引起注意与警惕了。     

解析生物钟

生物钟系统负责调控生物体内各种节律性生理活动，对该系统的研究正在三方面展开，即钟在器密组织中解剖定位，细胞内和细胞间的钟网络偶联，钟基因产物的表达和控制的分子时序。     

abx_(ij)型亚谱法解析ABX_n系核磁共振波谱

解核磁共振谱图,需识谱、计算和模拟。计算机为计算与模拟提供了方便,分析者的任务是快而准地识谱,本文介绍ABX_n系的识别。 ABX_n系核磁共振波谱由AB部与X_n部构成。以往常用复杂关系表达谱系结构。本     

梦的解析

每一个人都在做梦。在梦里，人的意识可以自由驰骋，不受社会现实的任何约束，所以，古人把梦称为神的王国。人类历史上最早记录梦的文字，出现在古埃及１２王朝时期，即公元前１５００－２０００年之间。在希腊，公元前６世纪成书的荷马史诗《伊利亚特》，就有了关于梦的描写。在印度，一本公元前５世纪的书中，有一章专门记叙了那个时代关于梦的预兆。考古学家在古巴比伦最后一位君主巴尼拔都城的废墟上，找到了一块碑，上面记载着当时人们如何解释梦，该碑因此被称为巴比伦人的“梦的指南”。在旧约圣经里，人们随时会读到各种“预言梦”的故事——法老的梦、约瑟夫的梦、雅各布的梦，这些梦构成了古代以色列人命运的转折点。在中国，至少可以把对梦的记录追溯到公元前 １１ ００年，即周朝开创年代，因为今天能看到的释梦书，都是以周朝开国宰相周公为名作成的。 在古代各民族的文明兴盛初期，对梦的解释成为人们精神生活的重要组成部分。也许早在人类发展的初期，人类就被梦中的景象困扰着。只是在人 类的知识和经验积累到一定程 度后，人们才开始形成探究梦 的理性冲动，才把梦作为人类 生活的一个现象记载下来。从 生物学观点看，做梦是哺乳动 物睡眠的特有生理现象。甚至 在一些低等动...     

解析广义函数

设Λ是n维复数空间C~n中的一个开区域.对任意λ=(λ_1…,λ_n)∈Λ,有一个单变数的广义函数T_λ,如果对任意φ∈(?),是λ∈Λ的解析函数,我们就称T_λ为λ的解析广义函数.在盖尔芳特和希洛夫的名著[1]中,许多重要而有趣的例子都是解析广义函数(Λ(?)C~1).     

解析次贷危机

次贷,次级贷款的简称.这个前年突露峥嵘的金融专业名词,现在已经家喻户晓.原来这个名词只在遥远的大洋彼岸的金融专业圈子里徘徊,猛然间它已打上了危机的烙印.以一种匪夷所思的方式引发了一系列重大事件、导致金融海啸并进一步蔓延到经济领域,从而深刻地影响到我们的日常生活.从其缘起到爆发、蔓延,人们充满疑虑:为什么一个"普通"的次级房贷会引发如此严重的金融危机,乃至全面的经济危机?本文就试着从技术层面来审视它.     

解析太阳奥秘

太阳是太阳系的主要天体,太阳系成员的能源都是太阳给予的。那么,太阳能又从哪里来?以前,有人认为太阳能量是燃烧煤炭得到的。然而计算表明,如果真是这样的话,太阳上1秒钟至少要燃烧13亿亿吨精煤。可是,即使太阳上全部是精煤,也只能燃烧6000年,而太阳已经存在46亿年了。显然,这种看法不对。后来又提出了许多模型,都因寿命问题一一被否定。100年前居里夫人发现了铀的放射性,之后爱因斯坦又发表了相对论,这些都为解决太阳能源问题提供了理论基础。相对论指出,通过原子核反应,质量可以转化为能量。在这个思想指导下,目前基本认定,太阳能量是由4个氢原子核聚变成1个氦原子核的热核反应产生的。1克氢经过核聚变能释放出6000亿焦耳能量,相当于燃烧15吨汽油!按照这样的产能速率。每秒钟只要6-7吨氢进行核聚变就够了,太阳上的氢足够燃烧100亿年。基于这样的推算,科学家认为,太阳及其家族成员可以存在100亿年。目前,45亿岁的太阳正处在中年时期,未来的日子还长着哩。     

Overview of the Basic Research on Vascular Surgery in China

This paper sums up the fundamental research projects on Vascular Surgery supported by National Natural Science Foundation of China from 1996 to 2000, and presents the experimental results and advances in the aspects of ischemia disease, the formation mechanism and prevention of restenosis, the development of abdominal aorta a-neurysm and portal hypertention.     

Spin Configuration and Superexchange Mechanism in Molecular Magnets Observed

Jointly supported by the National Natural Science Foundation of China, Ministry of Science and Technology and Chinese Academy of Sciences, Ma Xucun＇s group in CAS Institute of Physics and Condensed Matter Physics National I.ab, in cooperation with Xue Qikun＇s research team in the Department of Physics of Tsinghua University, studied the super exchange mechanism in cobalt phthalocyanine （CoPc） thin films by using a low temperature scanning tunneling microscope. With high energy-resolution spin-flip associated inelastic electron tunneling spectroscopy, they explicitly identified the specific molecular orbitals that mediate the super exchange interaction between molecules.     

Forest Bio-disaster Status and its Basic Research in China

This review outlines the characteristics and developmental trends of forest bio-disasters (including disease, insect and rodent pests) of recent years in China, summarizes the achievements of the basic researches supported by the National Natural Science Foundation of China, defines the main drawbacks, and proposes some important issues to be highlighted in the basic research in the future in order to integrate research resources, concentrate research objectives and to accelerate the development of forest bio-disaster basic research in China.     

Research Progress on High-Density Optical Storage Materials for Blue-Green Laser Recording

The key for the development of high -density optical storage technology nowadays is to develop short wavelength (blue-green laser) recording media and devices. Based on the progress achieved in the key program of National Natural Science Foundation of China "high-density optical storage materials using blue -green laser recording", the chemical composition, microstructure, storage performance and related mechanisms of some kinds of novel high density optical storage materials are presented in this paper. The research method and clew for super high -density optical storage materials and technologies are highlighted.     

List of Projects Jointly Funded by NSFC and RSE in 2011

The National Natural Science Foundation of China(NSFC) and the Royal Society of Edinburgh (RSE) jointly support exchange programs in the field of information sciences in 2011.After evaluation and consultation,7 projects are approved;     

Friends of NSFC in Obama's Cabinet

On 15 December,2008,the US President-Elect Obama Picked Steven Chu for Energy Secretary.Steven Chu is an old friend of NSFC.On May 4,1998,he attended a reception of Nobel Prize winners in Beijing hosted by the National Natural Science Foundation of China.The following photos were taken at the meeting.     

Vice President He Minghong Met with NSF Inspector General

NSFC Vice President, Prof. He Minghong met with Dr. Tina Boesz, Inspector General of the US National Science Foundation on 29 October, 2008. In-depth discussions were carried out on new progresses in both organizations on financial auditing and countermeasures on scientific misconducts.     

Vice President Shen Wenqing Attended the Second Meeting of ASIAHORCs

Prof. Shen Wenqing, Vice president of the National Natural Science Foundation of China, attended the second meeting of ASIAGORCs in Japan which was held from Nov. 27 to 28, 2008 and delivered his speech entitled ＂Regional scientific collaboration in the era of globalization of science and research＂.     

从国家自然科学基金看我国各省市基础研究竞争力

国家自然科学基金是我国支持基础研究的主要渠道之一,被科研人员公认为国内最规范、最公正、最能反映研究者竞争能力的研究基金.获得国家自然科学基金资助的竞争能力可以比较直观地反映出地区基础研究的水平和竞争力.基于对国家自然科学基金立项信息的深入计算分析,本文构建了基于国家自然科学基金竞争能力的基础研究综合竞争力指数,并结合其他相关统计指标,利用动态图表对我国大陆31个省市的基础研究竞争力进行了系统的动态交互式的可视化对比分析.研究结果表明:我国基础研究力量的地理分布非常不均匀,各省市间的竞争力差异巨大,但总体正朝着积极向好的方向发展.     

Introduction of Huaihe River Basin Energy and Water Cycle Experiment and Research

Huaihe River Basin Energy and Water Cycle Experiment and Research (HUBEX), as one of the Ninth Five-Year Plan (1996-2000) Major Programs supported by the National Natural Science Foundation of China (NSFC), successfully passed the check-up and won high appraisement from the experts.