扩展

For signed-bit values, if the number to be encoded is positive, an extra bit is necessary to preserve the leading 0; otherwise sign extension changes the bit value into a negative number.

对于带符号的位值，如果这个编码长度能够确定，一个扩展位必须保留第一位是0；否则，符号扩展将改变这个位值为负数。

In wireless broadband digital communication, Inter-Symbol Interference caused by time disperse of radio channel is one of main factors that limit bandwidth of communicated information and system performance of communication. In receiver, Orthogonal Frequency Division Multiplexing system can easily cancel ISI and equalize frequency-selective fadings that are both caused by time disperse of radio channel.

在这一系统中，无线信道时延扩展引起的符号间干扰是限制传输性能和信息速率的主要因素之一；而在消除符号间干扰和均衡由无线信道时延扩展引起的频率选择性衰落方面，正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)技术具有明显优势。

Extended logic programs without functions are introduced to represent the diverse access control policies, and the propagation depth and direction of privileges along the entity hierarchy can be constrained. After privilege conflicts are resolved according to the rules based on priority between different grantors and entities, semantics as answer sets of extended logic programs is attained.

采用类似于无函数的扩展逻辑程序的表示方法对安全访问策略进行描述，限定权限传播的深度，利用不同的优先次序定义了多种消解冲突的规则，并给出了类似扩展逻辑程序的回答集语义解释。

Retrogressive erosion data of long-term monitoring in the typical thaw slumping indicates that expanding of the thaw slumping fluctuates along with the ground temperature's annual fluctuation, and expanding mostly takes place in 7~9 months. The maximal expanding appears at the direction of the slope tendency.

滑坡溯源侵蚀范围监测资料表明，滑塌范围的扩展随地温的周期变化波动进行，并主要集中在7~9月，最大扩展范围出现在沿坡体倾向方向。

Crack sliding induced microcrack surface normal dilation and normal dilation induced microcrack further self-similar propagation are considered, the ineracting of sliding and propagation is clarified. The fourth-order tangent homogeneous stiffness tensor of shear microcrack is deduced, and at last the constitutive model of low porosity is expressed in increment formulation though unit sphere surface integral.

3在评述当前常用的微裂纹滑移准则的基础上，提出了本文的滑移准则，考虑了微裂纹滑移引起的裂纹面法向膨胀，以及由法向膨胀引起的微裂纹进一步扩展，阐明了滑移-扩展相互影响的细观力学机制。

The influences of nozzle structural parameters、standoff distance and jet pressure on rock erosion effect were researched by rock breaking experiment.

该文实验研究了叶轮中心孔直径、混合段长度、扩展腔扩展角、喷距和压力5 个主要参数对直旋混合射流破岩效果的影响规律。

In DEEOS, SSM model are introduced to modularize the embedded operating system, providing the object for extension.

在对相关技术研究的基础上，本文实现了一个可动态扩展嵌入式操作系统的原型—可动态扩展实时操作系统。

In the model of dry-distribution,the leaf age of different plants leaves and the distribution of assimilation at different positions were confirmed based on the distribution process of assimilation in combination to the organ building process.

基于黄瓜器官建成的同化物分配模型中，在现有的同化物分配理论的基础上，提出了基于器官发育模型的同化物再分配过程模拟，将器官的形态扩展和同化物分配过程相结合，确定了不同植株叶龄、不同位置的叶片获得的干物质模型，将同化物分配和形态扩展过程有机地融为一体。

And the strengthening mechanism can be described as follows: WC cemented carbides have interlaced short-clubbed grain, and in the bend strength test, the microcrack generates at WC/WC grain boundary, and may be blocked by interlaced fine-clubbed grains during extending, which induce the intergranular pulling-out. Due to the pulling-out mechanism, fracture-extend energy is greatly expended, thus bend strength is increased. The wear mechanism is groove wear and spalling of WC grains.

热机械合金化合成的WC-Co硬质合金比传统方法制备的同类WC合金具有更高的强度，其机理是：热机械合金化合成的WC合金具有交替排列的短棒状组织，在三点弯曲试验中，微裂纹萌生于WC/WC晶界位置，受到交错排列的短棒状晶粒的阻碍，裂纹扩展以短棒状晶粒的拔出方式进行，极大地消耗了裂纹扩展的能量，从而提高了弯曲强度；合成试样的摩擦磨损过程以犁沟磨损和WC颗粒的剥落为主要特征。

In this episode, we talk with Don Box and Doug Purdy about how today's networking infrastructure can be utilized in order to create a Connected System environment, and why this is important.

安装本更新程序不仅可以将文件管理 API 扩展到能够从未加密的卷发现和还原删除的文件，还可以扩展到能够从 BitLocker 加密的卷恢复文件。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。