不成形的

The friction, friction coefficient etc of prescind from external asperity model and the single asperity model in plasticity forming were respectively researched by using finite element analysis software ADINA and Coulomb friction model and nonlocal friction model.

应用大型有限元软件ADINA，采用库仑摩擦模型和非局部摩擦模型，对不考虑表面微凸的模型和单个微凸体模型在塑性成形中的摩擦力、摩擦系数等进行研究。

Aiming at solving the difficulties of prototype manufacturing of conical ring for the steam generator shell of 600MW Nuclear Reactor,this paper developed a new techniques for the prototype manu-facturing of the great conical ring utilizing ring rolling technology based on RAW200/160-5 ring rolling.

1引言600MW蒸汽发生器壳体是核电站的关键设备，由封头、锥形环件和筒体组焊而成。以往制造这种锥形环件所采用的办法是，先锻制环形筒件再采用机械加工方法成形或者采用自由锻造方法直接在水压机上锻制出大型锥形环件，但这些工艺既费工时又大量浪费材料，而且产品精度不高[1]。

Earthworks will be excavated mechanically and affiliated with hand works so as to improve work efficiency and ensure dimension accuracy. Foundation forms will be made with plywood which should be scatheless and smooth so as to ensure the shaping of concrete structures are satisfactory.

土方工程采用机械开挖人工配合，以提高工效和保证尺寸准确，基础模板采用胶合板，且投入的胶合板无损坏、不平面现象，以保证混凝土结构的成形符合要求。

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

With unique thermal property attributes, the interpolymer product is useful, for example, for impact, bitumen and asphalt modification, adhesives, dispersions or latexes and fabricated articles such as, but not limited to, foams, films, sheet, moldings, thermoforms, profiles and fibers.

由于其独特的热性质，该共聚体产生能用于，例如，抗冲材料、沥青及柏油的改性、粘合剂、分散液或胶乳及制备物件，比如，泡沫材料、膜、片材、模制品、热成形材料、型材及纤维，但不限于此。

As an important branch of Rapid Prototyping, Selective Laser Sintering is fallowed with great interest by the researchers in the field of manufacturing for it is widely usage in the sintering of metal polymer, ceramic and other powder.

作为快速成形技术的一个重要分支，选择性激光烧结SLS以其可加工材料广泛，不需工装等优点受到业内人士的广泛青睐。

ABSTRACT As an important branch of Rapid Prototyping, Selective Laser Sintering is fallowed with great interest by the researchers in the field of manufacturing for it is widely usage in the sintering of metal polymer, ceramic and other powder.

作为快速成形技术的一个重要分支，选择性激光烧结SLS以其可加工材料广泛，不需工装等优点受到业内人士的广泛青睐。。。。

St. Paul, MN April 14, 2004 Up until now, precision spring manufacturing has been an inexact science due to inconsistencies in the wire feed stock, and normal wear that occurs in the forming tool.

圣保罗，自2004年4月14日直到现在，无法精确的制造精密弹簧主要是由于金属丝内供给原料时在成形工具内发生的正常值不一致。

Based on the numerical simulation and physical simulation results, the Zr41.25Ti13.75Ni10Cu12.5Be22.55BMG super-plastic forging is carried out, and the asymmetry precision ratchets with full shape and clear profile are obtained.

在数值模拟与物理模拟的基础上，进行了Zr41.25Ti13.75Ni10Cu12.5Be22.5块体非晶合金超塑性模锻成形实验，获得了形状完整、轮廓清晰的块体非晶合金不对称精密棘轮。

The influences of the filler metal powder on the intensity threshold, weld formation and process stability have been studied during high power CO2 laser welding of aluminum alloy through the comparison between welding with and without metal powder.

通过采用和不采用填充合金粉末的比较试验，研究了填充合金粉末对铝合金高功率CO2激光焊接功率阈值、焊缝成形和焊接过程稳定性的影响。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。