查询词典 half-life period

In addition, since the back electromotive force occurring in an inductance element is cleared to zero during a half wavelength of period of the cosine wave, speed electromotive force can be measured by immediate shifting from a setting period to a measuring period.

另外，由于在余弦波的周期的半波长期间，使在电感元件中产生的反电动势VL清零，通过立即从设置周期转移到测量周期，能测量速率电动势。

The first half of the chapter begins with the introduction of three common viewpoints over the two kinds of theories, followed by deep investigation and description of some biased nature in them, then comes up with the conclusion that we must draw a clear distinction between what was said by Marx himself and what has long been accepted as dogmatical statements. The later half of chapter introduces various understandings to the theory of three social orders evoked by the discussion of economic social formation, points out the drawbacks of and the author"s disproval to the idea that economic social formation only exists in a definite historical period. This chapter is to deepen the understanding of Marx" theory of three social orders through the discussion of the other two important theories related to it.

首先介绍了迄今为止在"三形态说"和"五形态说"的讨论中出现的三种基本观点，并分别对这些观点加以反思，通过反思指出了这几种观点中存在的一些偏颇之处，提出了在讨论三大社会形态理论和五种社会形态理论的相互关系时要对马克思本人的"五形态说"和传统的教条化的"五形态说"加以明确的区分；接着介绍了在讨论"经济的社会形态"这一范畴时所引发的对三大社会形态理论的不同理解，指出了把"经济的社会形态"理解为一种特定历史阶段的社会形态类型所产生的问题，反对把"经济的社会形态"理解为一种特定历史阶段的社会形态类型。

Goals are proportion in the first half and the second half. Goals flood tide appear in the first 15 minutes of first half and second half, and the amount of goal reduce more and more as the time goes by during the other period of time. The main districts of goal are 1 section and 2 section. Besides, the big forbidden zone spread to 30M line section also become the main district of goal. The most important means of offense is tactics of placement, the ball past from side to the middle and offense of middle pass are also the important means of goals. Most of the goals are done by vanguard player, the aggressive plug into of vanguard has become the important means of goal in each team.

上下半时进球比较均衡，除了在上下半时开始的15min这两个时段出现进球高峰外，其余时段的进球数量随着时间的推移呈现递减趋势；进球主要区域是在1区以及2区，罚球区外到30m线区域也成为本届世界杯淘汰赛阶段射门进球的重要区域；由定位球战术发动进攻为进球主要进攻方式，边路传中以及中路传切进攻仍是比赛进球的重要方式；进攻方式以抢点直接射门为主；进球数最多的是前卫队员，前卫队员的攻击性插上进攻已成为各队进球的重要手段。

In the half-bred period of primary community, there was no family.

它不断维持着最直接的人类社会的延续性，并形成家族体系。

Jevons, who further observed that "among other meteorological cycles, there exists a three-and-one-half-year period in solar radiation and barometric pressure," which might help to explain the shorter-term business cycle.

Jevons的研究。他进一步观察："在其它气象周期中，有一个三年半的太阳辐射和大气压的周期"，着也许有助于解释短期的商业周期。

All patients were divided into two groups: the early period group and the late period group(from January 1997 to January 2004) and comparison was taken between two groups. The preoperative redox tolerance index, intraoperative hepatopetal blood occlusion of half liver, and postoperative arterial ketone body ratio were investigated and evaluated.

将病例分为前期组（前7年）和后期组（后7年）进行比较，同时对术前磷酸化耐受指数测定、术中半肝血流阻断及术后连续定时的动脉血酮体比率测定进行分析，并比较其价值。

At the 8-year scale,the overall trend of landuse in this oasis presented an increase in cultivated land,garden land,forest land,water area and construction land,and a decrease in meadowland and unoccupied land.In these 8 years,the dynamic degree of comprehensive landuse there was 0.61,while it was 0.55 in the first half and 0.38 in the second half of this period.

在8年尺度上土地利用总的动态特征是，耕地、园地、林地、水域及建设用地面积增加，草地和未利用土地面积减少。8年尺度渭干河-库车河三角洲绿洲综合土地利用动态度为0.61。

Short treatments (15–35 min after fertilization — about half the period of meiosis 1 in triploid eggs).yielded tetraploid and heptaploid cells.

因此，本试验试图利用Guo和Allen的方法对四倍体诱导中的一些基本条件进行优化。

Shou first, outstanding achievement of partial medium company is good, carry brace up medium board piece the person is angry, xin country installs the half annual report that (000839) issues to show in, the company realizes business income first half of the year 1.128 billion yuan, relatively go up growth of year of the corresponding period 27.31%; Net profit 137 million yuan, relatively go up growth of year of the corresponding period 44.20%.

首先，部分传媒公司业绩良好，提振了传媒板块的人气，中信国安(000839)发布的半年报显示，公司上半年实现营业收入11.28亿元，较上年同期增长27.31%；净利润1.37亿元，较上年同期增长44.20%。

An image display apparatus includes a display having data holding function, a vertical drive circuit sequentially and selectively scanning matrix form display elements, and a horizontal drive circuit writing a voltage among binary voltage preliminarily assigned depending upon the digital data of the image signal. The horizontal drive circuit and the vertical drive circuit are operated for performing selective scan of respective display element for at least m times in one frame period. The vertical drive circuit is constituted of n number of sequence circuits and logic operation circuits for outputs of the sequence circuits, where n is smaller than m, a period from inputting to the sequence circuit to outputting from the final stage being less than or equal to half of one frame period, and at least one of the sequence circuits being used with selectively inputting a plurality of inputs.

提供了一种图象显示器，其具有显示部，在矩阵上排列的象素内保有数据保持的功能，根据保持的数据进行显示；垂直驱动电路，对构成显示部的矩阵状显示器以每行按顺序作选择性扫描；以及水平驱动电路，对于由垂直驱动电路选择的行显示器件，根据应显示的图象信号数字数据，从预先分配的二进制电压中写入电压，并利用水平、垂直驱动电路，与应显示的图象信号同步，在1帧期间至少m次对各显示象素进行选择性操作，以此进行多色调显示，垂直驱动电路由满足n＜m的n个顺序电路和其输出的逻辑运算电路组成，顺序电路的输入从最后级输出为止的期间为1帧期间的1/2以下，并且，n个顺序电路的至少一个的输入是切换多个输入系统而使用。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。