森林生产力是森林生态系统中作为第一性生产者植物群落结构与功能的综合体现。

As the primary producer of forest ecosystems the forest productivity reflects the structure and function of plant community synthetically.

本文探讨了全球变化对塔里木盆地北部盐化草甸净第一性生产力（NPP）和群落演替的影响。

The impact of global change on net primary productivity (NPP) and community succession of salinized meadow in north of Tarim Basin was discussed.

作为直接意识而显示当下所是的感觉也体现了第一性的质料性。

Furthermore, the feeling is a quality, which is not conscious: it is a mere possibility.

植被净第一性生产力模型和模拟估算；

The models and simulating calculations of NPP.

认为物质第一性意识第二性的哲学派别。

Cynic is the member of a sect of ancient Greek philosophers.

计算模拟中使用了一种基于第一性原理的原子间互作用多体势函数。

A model many-body dual potential function has been used in our simulations.

计算模拟中使用了一种基于第一性原理的原子间互作用多体势函数.

A model many - body dual potential function has been used in our simulations.

其次，采用第一性原理密度泛函软件包CASTEP计了算碳纳米卷的几何结构、稳定性以及电子属性。

Secondly, the geometric structures, stability and electronic properties of carbon nanoscrolls are calculated by using the first principles density functional calculation package CASTEP.

发展基于第一性原理的科学计算方法并将其用于自由基环合反应。

It is devoted to develop a scientific methodology based on first principles to deal with radical cyclization reactions.

本文采用第一性原理研究了不同带宽下BN纳米带的几何结构与电子性质。

The geometrical structures and electronical properties of BN nanobelts with different width are investigated by first-principles study.