置换

If we study further the characteristic of this algebraic structure under the action of permutation group elements, it would provide a new approach to solve the problem about the renormalization of noncommutative scalar fields.

如果进一步考察该代数形式在置换群作用下的置换性质，就为我们提供了一种完全解决非对易标量场重整化问题的一种可能途径。

. This is the first study to compare employment status following Patellofemoral, Unicompartmental knee and Total Knee Replacement.

这是第一个进行髌骨关节置换、单髁关节置换及全膝关节置换后就业情况的研究。

A retrospective study of a consecutive cohort of 109 patients, under the age of 60, who had either a Patellofemoral replacement, Unicompartmental replacement or a Total knee replacement.

这是一个回顾性队列研究。患者109名，年龄60岁以下，进行过髌骨关节置换或单髁关节置换或全膝关节置换。

One case developed superficial putrescent; 2 cases (3 knees) suffered from knee pain after 2 months from operation, with no swelling or pressing-induced pain, and the range of motion was normal with well-located prosthesis by X-ray; 5 cases developed deep venous thrombosis.

HSS评分置换前平均(38.00±8.24)分，置换后平均(84.00±8.23)分。1例术后皮肤表浅坏死，2例(3膝)置换后2个月发生膝关节疼痛，但无红肿、压痛，活动度基本正常，X射线片示假体位置良好。

The mean Harris score was 47.3 preoperatively and 83.2 postoperatively. The excellent and good rate was 90.1%. The position of prosthesis was appropriate, no loosening or sinking was found at the final follow-up evaluation. Radiotransparent region was found in one region of one case three months after surgery but with no sclerosis, rest pain or activity pain, fever, or local swelling.

Harris评分由置换前的平均47.3分上升到置换后的83.2分，优良率90.1%，最近一次随访X射线片评价假体在位良好，无松动、下沉现象，关节功能恢复情况满意。1例翻修患者于髋关节置换后3个月复查时发现1区有局限性透光带，无明显硬化带，患者无静息痛或活动疼痛，无全身发热、局部红肿表现，为骨长入性稳定。

In order to extend the effect and security of image encryption algorithm.An image encryption algorithm is presented based on three-dimension chaotic system and bit-computation.The permutation sequences and binary sequences are generated using three-dimension chaotic system.Firstly,the image is pretreated using chaotic system and permutation transformation,then the pixel's gray value's bit sequences are permuted using the permutation sequences generated before,at last,the pixel's gray value's bit sequences are computed by using XOR operating and the binary sequences.

为了改进图像加密算法的安全性和效率，提出了一种基于三维混沌系统和位运算的数字图像加密算法，利用三维混沌序列的坐标分量分别产生置换序列和二值序列，在对待加密图像进行预处理的基础上，先应用混沌置换序列对预处理的结果图像进行基于灰度值位序列的置换操作，然后再应用产生的二值序列对结果图像的灰度值位序列进行位异或加密运算。

This paper brought out reconfigurable bit permutation network based on the Benes network, improved and implemened two kinds of configuration information extraction algorithms, namely, the dichotomy and parallel algorithms.

比特置换单元由比特置换网络和配置信息组成，基于Benes网络实现可重构比特置换网络，并改进和实现了两种配置信息提取算法，即二分法和并行算法。

Because of higher heavy metals concentration in leaching solution,the displacement rate of gold and silver with zinc powder is lower.

遂昌金矿采用氰化法处理高铜铅锌金精矿，由于浸出液中重金属含量偏高，在用锌粉置换金和银时置换率偏低，最低时金置换率只有12.66%。

This design method can provide a probably value of supply air volume of displacement ventilation in shopping mall at initial design stage. Or this design method can provide an initial value for CFD design.

对于商场的置换通风设计，本文的通风量计算公式可以给出一个初步的数值，该值可以用于商场置换通风系统的初步设计或者作为商场的置换通风CFD设计的边界条件。

There were 6 simple aortic valve replacements and 14 mitral valve replacements in this group.

20例心脏瓣膜置换，其中单纯主动脉瓣膜置换6例，单纯二尖瓣置换14例。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。