查询词典 fast neutrons

The positive charges here is the nucleon with the neutrons and then we have electrons in a cloud around it.

在这里正电荷表示核子与中子，然后我们有一团云状的电子围绕著它。

In the point reactor model, the probability function(n, t0, t) of a source neutron at time t0 leading to n neutrons at time t is dealt with. The non-linear partial differential equation for the probability generating function G(z; t0, t) is derived. By solving the equation, we have obtained an approximate analytic solution for a slightly prompt supercritical sys tem.

在点堆模型基础上，考虑了在t0时刻系统引入一个源中子，在t时刻产生n个中子的概率(n， t0， t)推导了概率生成函数G(z； t0， t)所满足的偏微分方程，并得到了近似解。

In order to achieve the high efficiency and uniform sensitivity for neutrons with widely different energies, the efficiency of long boron trifluoride proportional counter imbedded in polyethylene moderator was simulated by MCNP code.

为获得较高的探测效率且在较大范围内对中子有比较平坦的能量响应曲线，用蒙特卡罗程序研究了聚乙烯慢化体结构对BF3长正比计数管的中子探测效率的影响。

Two T3 He and D3He reactions are chosen for generating the neutrons. The neutron beam is collimated with the multiplex shielding system. The source intensity is monitored by the proportional counter or semiconductor proton recoil telescope. The neutron response curves of ST-401 scintillators with thickness from 0.16mm to 2.00mm are measured versus neutron energy. The uncertainties of experimental results are discussed in detail.

选用T3He反应和D3He反应作为中子源，子源，中子束流采用复合屏蔽体进行准直，源强采用正比计数管和半导体望远镜进行监测，实验测量了厚度从0.16mm到2.00mm的八种规格薄闪烁体的能量响应曲线，对实验的结果的不确定度进行了分析。

To slow down neutrons, the uranium may be put into the reactor in the shape of rods surrounded with a neutronslower such as carbon .

为使中子减慢，可以把棒状铀放进反应堆，其周围放上碳一类中子减速剂。

B. decrease, because more neutrons are resonantly absorbed in the fuel while they are being

B。 减小，因为热中子在燃内被共振吸收之增加，导致能被该控制棒所吸收之热中子较

1913 IsotopeOne of two or more atoms that have the same atomic number, but a different number of neutrons, Coined by Frederick Soddy.

同位素是指原子序数相同中子数不同的元素。这个词是由弗雷德里。索蒂（1877－1956，英国化学家，1921年获诺贝尔奖金）创造的。 fys中国英语学习网

Our current theory of elementary particles and forces, known as the Standard Model of particle physics, has achieved a unification of electromagnetism with the weak interactions, the forces responsible for the change of neutrons and protons into each other in radioactive processes and in the stars.

最近的关于基本粒子和力的理论，就是在粒子物理里面叫"标准模型"的，已经将电磁力和弱相互作用统一起来。弱相互作用可以使质子和中子在放射过程和星球内部发上相互转变。

When loading a nuclear fission reactions, release of fissile material can achieve the high-temperature thermo-nuclear center, high-density state and caused thermonuclear reaction thermonuclear reaction produces a large number of neutrons causing yet more fissile loading fission reaction took place, thereby improved efficiency.

当裂变装料发生核反应时，放出的裂变能使中心的热核材料达到高温、高密度状态并发生热核反应，热核反应产生的大量中子又使更多的裂变装料发生裂变反应，从而提高了利用效率。

This can result in a transmutation that changes the number of protons or neutrons in a nucleus.

这可能会导致出现一个嬗变可以改变一些质子或中子的核心。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。