查询词典 meteor stream

The observational result shows that this Quadrantid meteor shower occurs between 0000 to 0800 local time in January 4, 2004, with meteor echoes peaking at 0400 local time. Moreover the meteor shower radiant derived from the meteor echoes plane, which is formed by the whole meteor echoes observed by the meteor radar during this shower, accords well with the theoretic radiant of this meteor shower.

从观测结果可以发现此次象限仪座流星雨发生在2004年1月4日的0000-0800LT，其中流星峰值出现在0400LT，而且通过流星雷达观测到的流星雨期间的流星回波平面推测得到的流星雨辐射点也与该流星雨的理论辐射点位置对应非常好。

The Quadrantid meteor shower and the meteor speed during the period of this meteor shower are successfully observed using the Wuhan meteor radar for the first time, and then the correlative questions of observing meteor shower using the all-sky meteor radar are also discussed.

利用武汉流星雷达，首次成功地观测了象限仪座流星雨及流星雨期间的流星速度，讨论了利用单站全天空流星雷达观测流星雨的相关问题。

According to the difference of Doppler spectra of meteor trail echo and clutter of ground and sea, a FIR high-pass filter is designed to filter out clutter and so the meteor trail echo becomes obvious. Then a smart threshold is obtained from the minimum mean of different segments of background noise and used to detect the meteor trail echo. Finally the phase discontinuity of clutter from the meteor trail echo suppression is eliminated by substituting the data at echo positions with clatter.

该文根据地海杂波与流星干扰在多普勒谱上的差别，提出了用FIR型高通滤波器滤除杂波使流星干扰凸显出来；再根据流星干扰的分布特点分段计算背景噪声均值，求取流星干扰检测门限；最后用杂波信号来插值流星干扰位置上的数据，消除因去除干扰造成的杂波相位不连续。

Perseid meteor shower is an annual fixed July 17 to August 24 during that time, it is not only quantity, but almost never in the absence of the Star in the summer before, is the most suitable non-professional meteor observers of the meteor shower, status column throughout the year the first three periodic meteor showers.

英仙座流星雨每年固定在7月17日到8月24日这段时间出现，它不但数量多，而且几乎从来没有在夏季星空中缺席过，是最适合非专业流星观测者的流星雨，地位列全年三大周期性流星雨之首。

Meteor including single meteor, and the meteor shower of meteors fire are larger than mung bean of the meteoroid enters the atmosphere will be a visible brightness of the meteor.

流星包括单个流星、火流星和流星雨三种，比绿豆大一点的流星体进入大气层就能形成肉眼可见亮度的流星。

In this paper, each of single data stream that is included in data streams has same attributes set as other,the unit of single data stream is tuple,and same attributes set is included in each of these tuples.Reservoir algorithm is used to sample from these single data stream respectively,then some multiple snapshot windows are constructed,the relationship between these single data stream and multiple snapshot windows is bijective mapping,the relationship between attributes that are included in tuple and snapshot windows that are included in relative multiple snapshot windows is bijective mapping,and the relationship between basic windows that belong to same snapshot window and the attribute values that come from different single data stream is bijective mapping as well,that is,these attribute values come from same attribute that is comprised by different single data stream.

针对以元组为单位流入的具有相同属性集的多支单数据流组成的多数据流，提出了分别对每支单数据流进行蓄水池抽样，构造一一对应于各单数据流的若干个多快照窗口，即两者之间是双射关系，可以将多快照窗口串行置于主存中，将元组包含的属性与多快照窗口中的各个快照窗口一一对应，且使得同一快照窗口中的各基本窗口与取自其对应的单数据流的属性值样本一一对应，然后对这些相互独立的样本进行方差分析。

The sports ecosystem is a compound social ecosystem composed of person,sports and environment with characteristics of globality,arrangement of ideas,opening to the outside world,teleonomy,order,trend nature,dissipating nature and altitude artificialization;The energy flowing not only has energy stream,matter stream,information stream,but has the value stream,knowledge stream,ability stream,promotion and...

体育生态系统是一个由人—体育—环境构成的复合社会生态系统，具有整体性、层次性、开放性、目的性、有序性、动态性、耗散性以及高度人工化的特征；其能量流动不仅有能量流、物质流、信息流的传输和转化，还有价值流、知识流、能力流的富集，并不断地促进各层次体育的发展。

Meteor showers and occasional meteor is essentially different from the meteor shower is an important feature of all meteors reverse extend lines intersecting point to radiation.

流星雨与偶发流星有着本质的不同，流星雨的重要特征之一是所有流星的反向延长线都相交于辐射点。

About 50,000 years ago, however, a large meteor created Barringer Meteor Crater in Arizona , USA . Also known simply as Meteor Crater, the resulting impact basin spans over a kilometer.

然而，在50，000年以前，一顆巨大的流星在美國亞利桑那州，造成了貝林傑隕石坑，其直徑約有一公里。

The symmetric algorithm is a traditional algorithm, it is easy and efficient, and so it is still being popular used. The stream cIPher and the block cIPher are two part of the symmetric algorithm. The symmetric algorithm uses the key to control the key stream generator, and then the generator produces a random stream. We can get the cIPher by xor the message and the random stream by bit. In the field of communication and code, the stream cIPher has always been the key cIPher of the military affairs and foreign affairs.

对称密码体制分为序列密码和分组密码两类，序列密码以密钥控制密钥流发生器，产生一随机序列，用这个随机序列和明文信息逐位异或，就得到密文，其加密单元为比特。

There had been a moment during the breakfast meeting, though, after the backslapping and the small talk and when all of us were seated, with Vice President Cheney eating his eggs Benedict impassively and Karl Rove at the far end of the table discreetly checking his BlackBerry, that I witnessed a different side of the man.

那次早餐会期间，在表示过关心和寒暄以后，我们所有人坐了下来，我注意观察了一下，副总统切尼面无表情地吃着班尼迪克蛋（Eggs benedict，源自美国，以英式松饼、火腿、水煮蛋以及荷兰酱组合而成），卡尔。罗夫在餐桌的远端谨慎地经常查看他的黑莓手机，我目睹了他所不为人知的一面。

Talk Undelete failed; someone else may have undeleted the page first.

Talk 无法删除选定的页面或图像（它可能已经被其他人删除了）。