Chemical evolution

The environmental change of the primitive earth and the chemical evolution of life

早期地球的环境变化和生命的化学进化

Does it show evidence of geologic activity or organic chemical evolution ?

有没有地质活动或有机物质演化的证据？

Mechanism of Chemical Evolution for Quaternary Groundwater in Yangtze River Estuarine Region

长江河口地区第四系地下水化学演化机制

In the chemical evolution of every part of the earth tectonics plays a very important role .

在地球各个部分的化学演化中，构造起了十分重要的作用。

A review of influences of seawater chemical evolution on biomineralization

海水化学演化对生物矿化的影响综述

Chemical evolution of shallow groundwater and the residence time in the Ejina Basin

额济纳盆地浅层地下水演化特征与滞留时间研究

The origin of life is thought to start at the transit from chemical evolution into biological evolution .

生命起源开始于从化学进化进入生物进化。

Calculating the chemical evolution of galactic halo with Miller-Scalo initial mass function

利用Miller-Scalo初始质量函数计算银晕的化学演化

G Dwarfs Metallicity Distribution in the Solar Neighbourhood and the Chemical Evolution

太阳附近G矮星金属含量分布和化学演化

The Observational Constraints to the Multiphase , Three-Zone Chemical Evolution Model for Galaxies

观测结果对三成分多分量星系化学演化模型的约束

Chemical Evolution of the Galaxy

银河系化学演化研究进展

Solving the G-dwarf Problem with a Three-Component Model of the Chemical Evolution of the Galaxy

解决G矮星问题的银河系化学演化三成分模型

Summarizing the aggregation and interactions in supramolecule involving amino acids and the role in chemical evolution .

综述了氨基酸与有机小分子的聚合、分子间相互作用、几何特征及其在化学进化和生命中的作用；

Through the study of nuclear synthesis , we can understand the origin of elements , star formation and chemical evolution of galaxies .

通过对核合成的研究，可以了解元素的起源、恒星的形成及星系的化学演化过程。

Analysis about the abundance in different stellar populations is a very important subject in study of the structure and chemical evolution of the Galaxy .

恒星元素丰度是探讨银河系化学演化的重要探针，分析不同星族成分的元素丰度是研究银河系结构和化学演化的重要课题。

The chemical evolution of galaxies is a long-interesting problem for astrophysicist .

星系化学演化也是天文学者一直关心的问题。

Chemical evolution of magma in batholith of Nanjing-Zhenjiang mountain

宁镇山脉岩基岩浆的化学演化

It is very significant to Ba stars for heavy-element nucleosynthesis and Galactic chemical evolution .

钡星对于重元素核合成及星系化学演化的研究都有非常重要的意义。

Comparing with observation , we can conclude that the chemical evolution model of Galaxy can not fit the M31 's feature .

通过与观测比较发现，用银河系的化学演化模型不能很好得调和M31的各种观测特征，两者肯定具有不同的恒星形成历史。

The aim of the Galaxy chemical evolution research is to reproduce the element abundance patter of stars and gas in the Galaxy .

银河系化学演化研究的任务，从根本来说，是重现银河系中恒星与气体的元素丰度分布图象。

First , three phase changes are thought to take place from chemical evolution into biological evolution , namely from random organic reactions into vectorial metabolic pathways ;

首先，从化学进化到生物进化要实现3个相变，即：从随机的有机化学反应相变为定向代谢途径；

By further analyzing the meteorite , researchers hope to understand its chemical evolution and create a timeline of the chemistry of our universe .

科学家们希望通过进一步分析这块陨石能了解其化学演变，并为我们宇宙的化学制出一条时间轴。

The chemical evolution of life and the early evolution of the earth 's lifeless components constituted a set of interrelated , interactive and restricted processes .

地球上生命的化学进化与非生物部分的早期演化过程，是密切地相互关联、相互作用并相互制约的。

We model the galactic chemical evolution of primary metal element by using the instantaneous recycling approximation and the yield metal dependent which enable the problem to be handled analytically .

利用瞬时循环近似，考虑元素产率随金属丰度的变化，得出了主要金属元素星系化学演化的分析解。

Mafic igneous rock , a widely distributed and typical mantle-derived rock , has become a major research source for revealing possible mechanisms for the chemical evolution of the mantle .

镁铁质火成岩作为分布最为广泛的典型幔源岩石，已成为探索地幔化学性状及示踪岩石圈深部过程的主要研究对象。

This measure protects teachers " and students " rights to present and hear " the full range of scientific views regarding biological and chemical evolution , " but it does little in practice .

这个法规保护了老师和学生提出、倾听“关于生物和化学进化论的所有科学观点”的权利，但并没怎么落实。

AGB stars have important significance to the element nucleosynthesis and the chemical evolution of the galaxy . They are the main site where elements heavier than Fe are formed in universe .

AGB星对于元素核合成及星系化学演化都有非常重要的意义，它们是宇宙中比Fe更重的元素的重要产生地。

The dissertation consists of two sections . The first one mainly introduce the chemical evolution model and observational constrain , and the second mainly introduce the nucleosynthesis of r-process and the chemical evolution of Ba peak elements .

本文分二部分，第一部分重点介绍星系的化学演化模型和观测约束，第二部分重点介绍r-process核合成和Ba峰元素r-process的星系化学演化。

The " self-purification " of minerals under very high pressures may be of special significance for the chemical evolution of the different layers of the Earth , and it may be a way of redistribution of trace elements in the solid state among different minerals .

矿物在高压下的这种自净行为可能是固态条件下矿物之间微量元素重新分配的一种方式，这种行为可能对地球不同层圈的化学组成演化有特别意义。

Study on the chemical structure evolution of Jixi coals

鸡西煤化学结构的演化