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Finally,according to the geometry structure of bits,the motion characteristic of tooth in each row was analyzed, including their scraping mode influenced on the cone/bit ratio.

在过去几十年中，许多研究者对牙轮钻头的运动进行研究，但是他们都对这些问题作了过分的简化，以致

With the geometry model of the roller cone rock bit and kinematics model, by setting up rock failure model of bottom rock and interaction model between teeth and rock, the interaction dynamic modeling of Bits and rock is established in the process of petroleum drilling.

本文对在钻井过程中由于牙轮钻头与岩石互作用及钻柱的弹性变形导致牙轮钻头和钻柱在钻井过程的振动问题进行了深入地分析研究。

Plate, diamond tools graphite mold, sinter mold geological drill bits, industrial furnace, hot isostatic pressing equipment A variety of graphite heating elements, a variety of body heat, heater and production of monocrystalline silicon heater and shield, etc..

条。板，金刚石工具石墨模具、地质钻头烧结模具、工业电炉、热等静压设备的各种石墨发热元件、各种发热体、加热器及生产单晶硅的加热器和屏蔽罩等。

Microscopic analysis of the coffer reveals that it was made with a fixed point drill that used hard jewel bits and a drilling force of 2 tons.

围堰微观的分析显示，这是一个固定点演练提出，用硬宝石位和2吨的钻探力量。

Bulk volume of the volume of block block block caliper micrometer-specific block, such as special types of straight shank drill bits Serratula straight shank long twist drill set, such as alloy straight shank twist drill reamer type of hand reamer straight shank straight shank machine reamer taper shank machine reamer and other types of coarse tooth cutter straight shank cutter tooth taper shank Rough Milling fine-tooth cutter straight shank end mill, such as hand-tap machine tap tap tap left teeth straight pipe tap, such as garden die die die left teeth straight pipe die die US-made of other alloys such as Alloy blade machine Segment saw blade, such as gear type inverted roller gear Gear planing cutter knife disc-shaped gear gear shaper cutters, such as factory outlets: cast iron flat, square boxes, granite slab, square and so on.

量块 散量块卡尺专用块千分尺专用块等钻头类直柄麻花钻直柄长麻花钻镶合金直柄麻花钻等铰刀类直柄手铰刀直柄机用铰刀锥柄机用铰刀等铣刀类粗齿直柄立铣刀粗齿锥柄立铣刀细齿直柄立铣刀等丝锥手用丝锥机用丝锥左牙丝锥直管丝锥等板牙园板牙左牙板牙直管板牙美制板牙等其他合金刀头合金刀片机用锯条等齿轮倒类齿轮滚刀齿轮刨刀齿轮铣刀盘形插齿刀等厂家直销：铸铁平板、方箱、花岗石平板、直角尺等。

It is proposed that economical performance of diamond bits be quan-titatively appraised by use of bit drilling cost .

并提出用钻头钻进成本定量地评价金刚石钻头的经济效果。

Alumstone processes nothing waste material synthetically , all products all may reclaim the material making use of alums and the filling smelt leftover bits and pieces of the potasium sulphate queen but being used for aspect such as swelling agent , cement , smelt.

明矾石综合加工无废料，所有产品都可回收利用，冶炼明矾和冶炼硫酸钾后的下脚料可用于膨胀剂、水泥等方面的填充料。

In chapter three, the author studies channel coding and decoding techniques, that is Woven codes. On the basis of other researchers'results, the author presents a four-port soft input and soft output module, in order to facilitate iterative decoding process of concatenated codes. This module is not only suit for decoding a concatenated code with non RSCs as its constituent codes, but also it can provide soft information output of both codeword and information bits, so it can be applied to decoding a Turbo code and joint detection and decoding. Taking into consideration serial and parallel concatenated Turbo code, the author proposes a combined code, with 2 outer codes and 2 inner cods as its constituent codes, i.e., 2×2 Woven code.

本文的第三章研究编码技术，在前人研究成果的基础上，为了模块化地对此级联码进行迭代译码，提出了一种模块化的软输入软输出四端口处理模块，此模块可用来处理非RSC卷积码为子码的级联码，并且可以提供码字和信息比特的软信息输出，是一种模块化很强的处理模块，可用于传统的Turbo码的迭代译码，尤其在迭代均衡和迭代检测的系统中并把它运用到B3G的系统设计中。

When a pile of poop discovered in an Oregon cave in 2002 was retested this year thanks to new techniques in DNA extraction, excited researchers determined that the ancient feces — officially called coprolites in polite archaeological terms — were human and were more than 14,000 years old, marking the earliest evidence of human presence in North America by almost two thousand years. Other bits and pieces of cultural material have turned up in the Americas and called the date into question, but the coprolites are the oldest of definite human ... extraction.

今年科学家对2002年在俄勒冈州一个洞穴发现的一堆粪便使用DNA提取新方法再次进行检查，他们惊喜地发现这堆粪便，也称粪便化石是人类的粪便，距今1.4万年之久，这标志着人类在北美存在的最早证据提前了两千年。

BCBBs are designed for not only symmetric linear arrays but also asymmetric linear arrays, are arrays and circle arrays. The BCBBs designed are tested by LFM signals, and the results show that the BCBBs achieve good quality. The word length of the filter efficients are studied from the view of engineering implementation. It is shown that using 8 bits can satisfy the requirement. Multi-beam BCBBs with 2 degree beamwidth in two octave and 1/3 octave frequency band are designed and tested for a specified array.

设计好的宽带恒定束宽波束形成器用线性调频信号进行了检验，证明了其正确性；从工程实际的角度出发，研究了滤波器系数字长对系统性能的影响，研究表明采用8位的滤波器可以满足要求；结合实际课题，在深入分析阵形结构特征的基础上，分别设计了倍频程和1/3倍频程多波束宽带恒定束宽波束形成器，并通过线性调频信号进行了验证，为其工程实现打下了良好的基础。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。