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this paper analyses the basic principle of tpc,compares the error performance in the system which has been applied with tpc with the uncoded system,studies the influences which different block codes and iterative numbers to tpc decode performance.under the circumstances of different iteration numbers and block codes,experiment simulation is carried on.the simulation results indicate that introduction of tpc can get the code gain of 5~6 db.tpc decoding algorithm is simple,and doesn′t have the error floor,the complexity of its hardware implementation is smaller,it is a kind of practical channel coding method.

摘 要：在分析turbo 乘积码的基本编译码原理的基础上，比较了未编码与编码后系统的差错性能，研究了选取不同分量码、不同迭代次数对tpc译码性能的影响。在不同迭代次数与分量码情况下，进行了仿真实验。仿真实验表明，在相同的差错性能条件下，采用tpc码能带来5~6 db的编码增益。tpc译码算法简单，没有错误平层，硬件实现复杂度较小，是一种非常实用的信道编码方式。

The Lotus Exige is a renowned high performance coupe that has a well earned reputation of choice for drivers who demand uncompromised performance, both on the road and on the track.

莲花Exige的是著名的高性能轿跑车，有一个良好的选择，谁赢得了优异的性能需求驱动的声誉，无论在公路和赛道上。

The presence of BaO affected the TPR performance of Co/SiO2, and Ba loading of 2% increased the reduction degree of Co/SiO2 at the moderate temperature (450℃). The difference of the TPR performance between unpromoted and promoted catalyst samples could be ascribed to the induction of the reduction of BaO, and the interactions between barium oxide and silica, barium oxide and cobalt oxide.

研究结果表明，氧化钡明显地影响Co/SiO2的还原性能；添加2%氧化钡提高了Co/SiO2在中温(450℃)条件下的还原度；氧化钡的还原对Co/SiO2还原的诱导、氧化钡与氧化硅及与氧化钴之间的相互作用是导致Co/SiO2还原性能变化的原因。

The piano teaching also must follow the same principle of psychology doubtless. This text, seting out from the angle of the psychology, inquiries into the students in piano study and process of mental characteristic while giving musical performance and regulation, analyzes the unregular phenomenon that appear in study and musical performance, such as: the vulgar mental state, awe by difficulty and other mental obstacles, and aims at the training of students psychonogy to make them have good control of mental quality.

钢琴教学无疑也必须遵循心理学的相关原理，因此，本文是从心理学的角度出发，探讨学生在钢琴学习和演奏过程中的心理特征及规律，分析学生在学习和演奏过程中出现的不良心理现象，如：自卑心理、畏难情绪、演奏心理障碍，有针对性地对学生进行心理素质的培养，使其具备良好的心理自控能力和健康的心理品质。

Flow simulation and performance analysis are conducted for the stage of a high energy head unshrouded centrifugal compressor with vaneless and tandem diffuser respectively using CFD software. The flow field distribution and performance comparison are offered in the two conditions.

使用 CFD 软件对某高能头半开式离心压缩机的级，在分别采用无叶扩压器和串列扩压器时进行了流动模拟和性能分析，给出了两种情况下的流场分布和性能比较。

Patent, and then the blade-to-blade flow was computed by solving the two-dimensional steady Navier-Stokes equations, finally, overall performance and internal flowfield characterization were obtained and analyzed.2. As to radial matching between blade sections, preliminary investigations were developed from three aspects such as stall margin customizing technique, control technology of tip clearance flow, prediction model and control technology of corner separate.a On basis of reviewing on methods of achieving the goal of stall margin in design process of fan and axial-flow compressor, in conjunction of understandings on "Sweep/Dihedral", stall margin customizing technique was put forward; two-dimensional performance prediction method for stall margin customizing was developed, it can consider influences of radial stacking patterns of blade sections and axial distances between blade rows conveniently and rapidly.b A simple model for tip leakage mixing loss of unshrouded blades for compressible flow was presented.

二、叶片基元展向匹配方面，本研究从影响负荷最大化的叶身展向积迭注：原(来源：ABC论文35网www.abclunwen.com指掠弯是裕度定制的一部分，为方便论述，本文将此统一论述为裕度定制、叶尖间隙、叶片与端壁角区这三个最重要因素出发，探讨了各因素影响负荷最大化的机理，并由此给出了最大负荷设计过程中的技术措施和努力方向。1从掌控风扇/轴流压气机裕度方法回顾入手，探析了美国和俄罗斯裕度控制方法及相应特点，结合对&掠/弯&因素的认识提出了裕度定制技术：并开发了能够体现裕度定制思想的二维特性预估方法，可在二维层面下方便快捷地考虑以掠/弯为代表的叶片基元展向积迭以及叶片排间轴向间距带来的影响；2借鉴Denton关于不可压叶尖泄漏损失的理论分析，推导出适用于可压缩流动的叶尖泄漏掺混损失计算的基本关系式。

Due to their high strength and overall performance, the panels can be used as division and partion wall even the wall is very high and wide. Only steel structure should be used for fixing which is unstalled inside the wall and it is unnecessary to add wall posts. The anti-blast performance is 1.5 higher than that of brick wall.

由于强度高，整体性能好，因此可用作层高高、跨度大的墙体间隔，只要简单地采用钢结构锚固，型钢埋设于墙体内，大跨度，层高高的墙体就无需增加墙面的柱体，其抗冲击性能是一般砌体的1.5倍。

Parts; organic peroxide A as inhibitor Iparts; fumed silica as reinforcing filler 6C parts. Technical line: pretreatment of materialdisperse fumed silica Adding other ingredients vacuumize low temperature stockpile Single component additional liquid silicone rubber potting material prepared from this paper goes through the performance test analysis, and the results show that its performance parameters are corresponding with the same kind of overseas product, so it can completely substitute the imported product.

工艺路线：原料的预处理→白炭黑的分散→其它组分的加入电子工业用单组分加成型液体硅橡胶灌封料的研究一一一争减压排气-一一争低温贮存本文所制备的单组分加成型液体硅橡胶灌封料经过各项性能检测，与国外同类产品比较，性能指标基本一致，完全可以替代进口产品。

The emphasis of this paper is attached on the aerodynamic performance of the stationary components such as vaneless diffusers and crossovers and their influence on the total aerodynamic performance of the whole machine.

研究结果表明，多级离心压缩机的性能不仅决定于各级动叶本身的气动性能，而且受级间静止部件的气动性能影响较大。

The flowfield and performance of a centrifugal compressor was predicted and analysed, which was composed of a Krain's impeller and two types of vaneless diffuser specially: one was constant area vaneless diffuser and the other was the straight-wall. The results show that the efficiency of the straight-wall vaneless diffuser is obviously lower than that of the constant area, and a separate flow occurs nearby the exit of the centrifugal impeller with the straight-wall diffuser. However, the type of vaneless diffuser has little influence on the aerodynamics performance of the centrifugal impeller. Finally, it is suggested that the constant-area vaneless diffuser should be selected as the downstream extended area of the centrifugal impeller during the prediction for the centrifugal impeller.

对Krain叶轮后带等面积与直壁两种形式的无叶扩压器离心压缩机内部流场进行了计算与分析，结果表明：直壁型无叶扩压器离心压缩机的效率低于等面积无叶扩压器离心压缩机的效率；直壁型无叶扩压器使得叶轮出口的流动出现分离；扩压器的形式对离心叶轮的整体气动性能影响并不大；在进行离心叶轮数值研究时，叶轮后的延伸区最好采用等面积无叶扩压器，以尽量减小无叶扩压器所引起的计算误差。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。