中脉

Such analysis shows that:(1) Some OH masers are confirmed of their radiative pumping mechanism while some other OH masers might be pumped by other mechanisms, and for another set of OH masers whose radiative pumping lines which is expected by our estimation based on modeling work are not detected, which may be due to other reasons such as clumpy OH shell and limb filling emission effect.

这些分析结果显示：(1)除了一些OH／IR源的OH 1612MHz脉泽可能确实是由红外辐射抽运的外，另有一些OH／IR源可能是由其它抽运机制抽运的，还有一些OH／IR源，可能是由于诸如OH脉泽壳层分布不均匀或OH脉泽壳层填充发射等原因，其光谱中的这两条红外吸收线按照模型估计本应该被探测到而实际上却没有探测到。

Seven molybdenite samples from greisen ore body and quartz vein tungsten ore body associated with black tungsten ore were chosen for Re-Os isotopic dating and model age of (141.4±2.2) Ma~(158.2±2.2) Ma were obtained. The isochrone age of molybdenites from greisen type tungsten-tin ore body is (156.8±3.9) Ma, which indicates that its mineralogenetic epoch is at the Middle Jurassic, corresponds to the second stage of early Yanshanian period. And the model age for the samples from greisen ore body and from quartz vein ore body are (150.7±2.4) Ma~(158.2±2.2) Ma and (141.4±2.2) Ma~(151.0±2.4) Ma respectively, which indicates that the mineralization time of the quartz vein ore body is slightly earlier than that of greisen ore body.

文章选取云英岩型矿体及上部石英脉型钨矿体中与黑钨矿共生的辉钼矿7件，进行Re-Os等时线年龄测定，得到其模式年龄为(141.4±2.2) Ma~(158.2±2.2)Ma，其中云英型钨锡矿体中辉钼矿等时线年龄为(156.8±3.9)Ma，成矿时代为中侏罗世，对应于燕山早期第二阶段；从云英岩矿体中样品模式年龄为(150.7±2.4)Ma~(158.2±2.2)Ma，石英脉型矿体中样品模式年龄为(141.4±2.2)Ma~(151.0±2.4)Ma。

The progress and current situation of observation and study on the spectra of celestial SiO maser since it was discovered in 1973 are reviewed in this paper.

一、引言天体510、HZO和OH脉泽是宇宙中最强、最重要的脉泽。因此，对天体510脉泽源的观测研究显得很重要。

The adjustable amplitude range, symmetry and low ringing of the monocycle pulse are important to judge the performance of the pulse generator. Furthermore, the pulse generator should avoid the process variation and be suitable for different requirements.

目前脉波产生器的研究中，以脉波的高度可调性、对称性和低涟波为最重要，再者由於晶片中的制程变异或是需应用於不同的情况，因此目前的脉波产生器研究皆以此目标迈进。

In this thesis, we propose two pulse generators whose pulse amplitude is adjustable. These pulse generators use the second-order transient circuit at over-damping mode to generate the adjustable monocycle pulse with good symmetry and low ringing in the simulation and measurement.

本论文提出两个脉波高度可调的脉波产生器，主要观念在於利用RLC二阶暂态来产生脉波，并利用过阻尼响应来降低脉波尾端的涟波，从模拟与量测中可验证此特性。

We designed the multi-channel delay and pulse adjustment circuit based on CPLD providing a solution to fast gating timing and delay problems in large nuclear physic experiments. Its main function is accepting a negative NIM trigger input, and outputting a pulse with adjustable delay and width. Minimum step accuracy of the delay and the pulse adjustment is 10ns when the system frequency is 100MHz.

针对大型核物理实验中的符合测量、多路时间测量系统中的门控快定时信号等应用的需要，设计了一种多路延迟／脉宽调节电路，主要功能是对输入的多路快信号进行延迟和脉宽调节，支持NIM负信号输入和输出，在系统主时钟频率为100MHz的时候，延迟和脉宽调节的最小步进精度为10ns。

According to previous studies, false veins can roughly divide into two major types:(1) recurrent vein: form by fusion of leaflets, for instance, false veins of Angiopteris;(2) false veinlet: form by reduced veinlets, for instance, false veins of Hymenophyllaceae.

从过去的研究中，大致可将假脉分为两大类型(1)回脉：由相邻小羽片之边缘互相愈合而成，例如观音座莲属之假脉；(2)假支脉：由支脉退化而成，例如膜蕨科之假脉。

PDA(particle dynamics analyzer system) was used to measure the flow velocity of particles in the XFD-12 flotation cell, the results show that tangential mean velocity in the radial direction changes from positive to negative in the flotation cell, naught point emerge in the medium of the radial direction ,it is where backward fluid emerge ,shear stress of backward fluid induce the particle detachment from bubbles .

汁算数据与实际矿石筛析结果都表明，紊流强度增大，泡沫中粗粒级含量减小。 4。用PDA在XFD-12型8L浮选机中测定的速度值，进行混合区、分离区、泡沫区紊流运动功率谱计算，得紊流脉动频率，混合区小于20Hz，分离区在20-30Hz之间，泡沫区在25-35Hz之间，浮选槽内紊流脉动以低频为主，且紊流脉动动能是混合区大于分离区大于泡沫区。

Petrologic and geochemical investigations of mafic dikes in detail were concentrated in north Gangdong from southeast China so far, a few half-backed study on mafic dikes of south Hainan and coastal belt of Fujian and southeast Hunan and ore region of some hydrothermal deposits, so systemically and large area investigations of mafic dikes from southeast China is still few and need to undertake in the future.

由于出露面积的关系，岩脉或岩脉群往往容易被人忽略，直到最近五年来中国东部中新生代基性岩脉的地球动力学意义才引起地质学者的关注，甚至有些学者指出中国东部中生代基性岩脉的研究可以填补国际上对此方面的空白。

One of the critical point for solving this problem is to effectively identify the pumping mechanisms of known OH masers and find out the physical connections between the masers and the objects bearing these masers.

解决这个问题的关键之一就是在已知的OH脉泽源中有效地鉴别出它们的脉泽抽运机制，并由此找出脉泽特征与产生脉泽的天体之间的物理联系。

The reasons of iron ions content overproof in grade Ⅱ desalting water system,such as variation water quality,contamination of regenerant , operation adjustment of pretreatment system and switching operation of bed were discussed.

对二级脱盐水系统中铁离子含量超标的原因，如来水水质发生波动、再生剂受到污染、预处理系统操作调整、床体运行切换等进行了论述。

You were hired to drum up new business, so go and do it.

公司雇你招徕新业务，你就做你的事好了。