查询词典 fold singularity

Cell lines were co-tranfected with bi-plasmids and cultured at 1% O〓 condition, luciferase assay demonstrated that all of the expression systems with different domains could be hypoxia-activated. GAL-CAD achieved more than 100-fold induction in A549 cell and more than 40-fold in HepG2; expression level of the system markedly increased after addition of glycin arm, almost 10-fold enhancement in HepG2 cell. Because basic expression also increased, the induction fold by hypoxia decreased.

双质粒共转染不同细胞株后，在1％O〓环境下培养24h，荧光素酶活性检测结果提示含不同结构域的表达系统均有受缺氧激活的能力，其中GAL-CAD在A549中获得100倍以上的诱导，在HepG2中获得40倍以上的诱导；加入甘氨酸臂后该表达系统的转录活性大为增强，在HepG2细胞中增强了10倍以上，但是由于基础表达也有所增加，受缺氧诱导的倍数下降。

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

Detection on signal singularity point is also discussed in this thesis. Lift Wavelet this text also discussed lifting wavelet usage in other fields, such as: Detection on signal singularity point, Image fusion. Experiment enunciation, Lifting wavelet to all has a good performance in these aspects.

另外本文还用提升小波实现了变换信号奇异点的检测以及基于加权融合策略的图像融合；实验表明，提升小波在图像处理的其他方面也有很好的处理效果。

Plane strain, mode I quasi-static steady state crack growth is investigated utilizing the finite element method. It is once again established that TNT plasticity can significantly increase the stress level near the crack tip. The crack tip stress singularity is higher than or equal to the square-root singularity of elastic K field and is also independent of the plastic hardening exponent.

采用有限元方法研究了平面应变Ⅰ型准静态的稳态裂纹扩展，再次证实TNT非局部理论能够显著提高裂纹尖端附近的应力水平；裂尖应力场的奇异性超过或等于弹性K场平方根奇异性，而且与塑性硬化指数无关。

In development of these programs under cylindrical coordinates, the singularity at the pole and transfer phenomenon across the pole were studied deeply and a numerical method which has made these programs efficient in 3D function was advanced and employed to eliminate the singularity by setting up a special mesh at the pole on the polar plane.

针对炼钢生产钢包吹气搅拌精炼工艺，本论文从开发数值仿真程序入手，分别对吹气搅拌条件下钢包金属熔池体系的流体流动、传热和传质、夹杂物碰撞长大和排除等传输现象进行了数学模型或物理模型研究。

The section curve graph of a singularity surface is drawn. A numerical example of singularity configuration analysis is given for illustration.

主进给机构的奇异位形的集合为参数空间的曲面片，得到了奇异曲面方程及奇异曲面的截面曲线图，给出了奇异位形分析计算的数值实例。

Singularity often carries the most important information of signal, so it is valuable to study the singularity of signal.

摘要信号的奇异性往往携带了信号最重要的信息，因此，对奇异性的研究是一项很有价值的工作。

The algorithm reaches effective balance between noise limiting and detail enhancing with Bandelet transform's superiority in presenting the linear singularity and the surface singularity of planar image.

提出了基于Bandelet变换域的图像自适应增强的新算法，利用Bandelet变换在表示二维图像线、面奇异性时的优越性，实现了抑制噪声和凸显细节间的有效均衡。

This paper analyzes the nonlinear deformational process of the envelop structure and the cause of stiffness matrix singularity in details. In order to eliminate the stiffness matrix singularity, this paper puts forward solutions to apply bend stiffness to membrane materials.

本文详细地分析了囊体结构的非线性变形过程及刚度矩阵出现奇异的原因；并提出了给膜材料施加弯曲刚度来消除刚度矩阵奇异的解决办法。

A number of facts have approved that wavelet mainly adapts to the isotropic singularity object.but to the anisotropic singularity,such as the verge of image and the wirelike character, wavelet is not the best tool.

大量事实证明，小波主要适用于表示具有各向同性奇异性的对象，对于各向异性的奇异性，如数字图像中的边界以及线状特征等，小波并不是一个很好的表示工具。

Article 144 The Government of the Hong Kong Special Administrative Region shall maintain the policy previously practised in Hong Kong in respect of subventions for non-governmental organizations in fields such as education, medicine and health, culture, art, recreation, sports, social welfare and social

第一百四十四条香港特别行政区政府保持原在香港实行的对教育、医疗卫生、文化、艺术、康乐、体育、社会福利、社会工作等方面的民间团体机构的资助政策。原在香港各资助机构任职的人员均可根据原有制度继续受聘。

Small wonder, then, that the Chinese spend more in the shop than any other group of foreign visitors do .

这样的小惊喜，使中国顾客比任何国家的人消费得更多。