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The friction performances of carbon face were investigated with an inertia friction tester. The torque curve of carbon face was ideal, the coefficient of static friction was lower than that of dynamic in 0.28 MPa, the friction coefficient of static and dynamic decreased with the braking pressure increasing. To the fiber face, the coefficient of dynamic friction of carbon face was more stable in cycle braking process, the wear rate was lower, and it was efficient to protect the couple plate not to be worn.

结果表明：碳质层的摩擦力矩在制动初期上升较快，中间过渡区平稳，尾部翘起较小；在制动压力小于0.28 MPa时静摩擦系数小于动摩擦系数，且动、静摩擦系数均随制动压力增加而减小；相对纤维层而言，采用碳质层摩擦时摩擦力矩曲线形态更好，连续制动时摩擦系数波动较小，磨损率低且能够有效保护偶件，是1种静/动摩擦系数比较低且适用于高载荷工况条件下使用的摩擦材料。

Statistic analysis result shows that the time step is the most important influence factor of simulation precision, and there is relation between simulation error and the setup value of restitution coefficient which the greater the setup value is, the less the simulation error is. Although there is no effect to the total contact time in the course of collision, the value of the time step decides the total contact step, and there is a logarithmic linear correlativity between them.

统计分析结果表明：计算时步是影响模拟精度最重要的因素；模拟误差还同恢复系数的设定值有关，设定值越大，模拟误差就越小；计算时步的大小虽然对碰撞过程的总接触时间影响不大，但是却决定了碰撞过程的总接触时步数，二者之间存在对数线性相关关系

The friction performances of carbon face were investigated with an inertia friction tester.The torque curve of carbon face was ideal,the coefficient of static friction was lower than that of dynamic in 0.28 MPa,the friction coefficient of static and dynamic decreased with the braking pressure increasing.To the fiber face,the coefficient of dynamic fric...

结果表明：碳质层的摩擦力矩在制动初期上升较快，中间过渡区平稳，尾部翘起较小；在制动压力小于0.28 MPa时静摩擦系数小于动摩擦系数，且动、静摩擦系数均随制动压力增加而减小；相对纤维层而言，采用碳质层摩擦时摩擦力矩曲线形态更好，连续制动时摩擦系数波动较小，磨损率低且能够有效保护偶件，是1种静/动摩擦系数比较低且适用于高载荷工况条件下使用的摩擦材料。

Our research work concentrates on the severe communication circumstances, for example, spatially correlative and time-frequency selective fading channel, and focuses on the design of codec for space-time architecture and the utilizing of linear precoding technique especially on the multiuser scenario trying to improve the system performance to combate various fading.

论文首先基于已有空时相关MIMO信道模型，分析给出了联合空时互相关函数解析表达式，并推导给出了空时分组编码传输方案理论成对错误概率表达式。

ABSTRACT Over the last few years much attention has been paid to the development of the technologies for Community Antenna Television networks. New technologies that can be used to support data communication service over CATV networks are developed. The new Hybrid Fiber Coaxial technology is spreading out rapidly in CATV networks. The usage of fiber provides large bandwidth and thus enables some new services to be delivered along with television broadcast. The CATV networks are expected to support diverse traffic with various service requirements.

随着新技术的不断发展，人们希望能够利用有线电视网络提供新的业务，HFC技术在有线电视网络中的广泛使用使得有线电视网络的带宽增加，也使得有线电视网络除电视广播外还能够提供其他的服务，这些服务的服务质量要求各不相同，如：数据服务要求低的丢失率，对延时的要求较低；而语音服务可容忍一定的丢失，但对延时、延时抖动有严格的要求，因此需要开发新的协议。

If R satisfies =0 for any elements x ,y in R then ⑴when k =1, R is commutative;⑵when R has the unity, R is commutative;⑶when R has at least one right regular element and f 2 (t 1,t2) has no terms with degree1 such that Fn= F then R iscommutative when R has at least one right regular element. Here we would like to point out that the above results generalized the results of Fu changlin ,moreover generalized some results of other references . This results enriched the commutative conditions of any ring.

若任取R 中元x， y均有=0 那么⑴k =1时R 为交换环；⑵R 有单位元时R 为交换环；⑶f_2 (t_1，t_2)中t_2的次数不小于k -1且R 中至少有一个右正则元时R 为交换环。

Although Xing Yunlu pointed out the disadvantage in the Shoushi Computus and the Datong Computus at the same time, he deemed that the Shoushi Computus is the most exact calendar in the Chinese traditional ones. Therefore, Xing Yunlu believed on some degree that he would realize the revival of the traditional calendrical astronomy through resuming some astronomical algorithms of the Shoushi Computus.

指出，邢云路虽然同时指出了《授时历》和《大统历》中存在的一些问题，但是他还是认为《授时历》是中国古代历法中精度最高的一部历法，所以邢云路在很大的程度上将历法复兴的希望寄托在对《授时历》的恢复上面。

The rate of c-kit+ cells in the heart increased gradually from E10 with the highest level of 12.6±3.2% at E11, which was nearly similar to the fetal liver, except for E12 when the c-kit+ cells was 3.4±1.2% in the heart compared to the fetal liver with 11.6±4.1% c-kit+ cells. The rate of c-kit cells in the suspension cells from the heart at E11 maintained stable after 24h culture based in the stromal cells of the heart and AGM region with the same conceptus age, but the rate of c-kit cells obviously decreased in the condition of the stromal cells from the fetal liver. The c-kit cells of the three conditions were all at low level at 48h without significant difference.

通过流式检测c-kit+细胞我们发现，胚胎期心脏和胎肝c-kit+细胞比率几乎一致，E11时c-kit+细胞明显增多，分别高达(12.6±3.2)%和(9.6±2.8)%，但E12时心脏中c-kit+细胞明显减少，仅为(3.4±1.2)%，此时胎肝中c-kit+细胞为(11.6±4.1)%。E11的悬浮细胞与心脏内皮细胞和AGM区基质共培养24h时，c-kit+细胞数量保持稳定，但在胎肝基质细胞中c-kit+细胞数量明显减少，在共培养48h，三组中的c-kit+细胞均呈较低水平，组间没有显著性差异。

On defining the conditional threshold of discretized density evolution, a method for designing the time-invariant quantized decoder with finite levels, which can approach the optimal time-varying one and hence the continuous decoding, is proposed.

应用Shannon率失真理论以及密度进化理论，阐述了最佳量化译码的时变特性，建立了离散密度进化的条件阈值概念，提出了二元输入对称信道上逼近最佳时变量化译码、进而接近连续译码的时不变量化译码设计方法，推导了量化和积算法与最小和算法的等价条件，从误码率性能、错误平层和平均迭代次数等三个指标全面衡量量化译码性能； 5。

The direction which embroiders wants consistently, while rising needle should make sure central point, while embroidering to loosen to make an effort tightly and appropriately to be even, while rising needle or ending don't tie knot, should stay an 1cm or so line head in the noodles anticipate back press a prison mutually, noticing don't make the line head entwine conglobation.

一、绣出的方向要一致，起针时应确定中心点，绣时要松紧适度用力均匀，起针或结束时不要打结，应留出一厘米左右的线头在面料背面相互压牢，注意不要使线头纠缠成团。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。