查询词典 difference equation

In chapter 5, we study necessary conditions for difference sets and we obtain the following: we proved that there are no nontrivial difference sets in dihedral group of order 4p〓, where p is a prime, d is a positive integer; we give a necessary condition for Hadamard difference sets in some group of order 4p〓, and completely solve a general case left in Dr.

在第五章中，我们研究了差集存在的必要条件。

This paper is an investigation of the differences between monosyllabic and disyllabic time adverb as a synonymy which display in three aspects: the difference of syllable of the modifying object,the difference of pragmatic rank and the difference of grammatical function.

同义的单音节时间副词和双音节时间副词之间，存在三个方面的差异：修饰对象的音节差异、语用移位的差异以及语法功能的差异。

And the heat transmission model is computed with FEM. Then the paper analyzed rules of difference in temperature. Different in temperature is divided into transverse temperature difference and lengthways difference, and corresponding formulas are respectively presented.

并在此基础上，进行了导热问题的有限元分析，得到了温差分布规律，将计算温差分解为横向温差和纵向温差几，并建立了相应的温差计算公式。

Results 1 there were no significant differences of amplitude of accommodation and accommodative lag between the myopia group and emmetropia group. The differences of amplitude of accommodation between the myopia group and hyperopia group were significant (t=2.21, P=0.03.05; t=2.83, P=0.006.05). 2 The difference of accommodative lag between the dominant eye (0.73±0.31) D and non-dominant eyes (0.81±0.38) D in myopia group was signiflcant.3 The accommodative lag of dominant eyes was (0.68±0.36) D and it of non-dominant eyes was (0.75±0.34) D, the difference was significant (t=2.06, P=0.042.05, n=95).There was no significant difference between the amplitude of accommodation of dominant eye (12.9±3.09) D and non-dominant eyes (12.6±3.09) D.

结果 近视患儿的主导眼和非主导眼的调节幅度和调节滞后与正视儿童均差异无统计学意义；而其主导眼和非主导眼的调节幅度比远视患儿明显更大(t=2.21， P=0.03.05； t=2.83，P=0.006.05)；两组的调节滞后差异无统计学意义。50例近视患儿主导眼和非主导眼的调节滞后值分别为(0.73±0.31)D和(0.81±0.38)D，主导眼和非主导眼间差异有统计学意义(t=2.14，P＝0.038.05)；调节幅度分别为(13.39±3.51)D和(13.26±0.60)D，差异无统计学意义。95例观察对象的主导眼的调节滞后度为(0.68±0.36)D，非主导眼调节滞后度为(0.75±0.34)D，主导眼和非主导眼间的差异有统计学意义(t=2.06， P=0.042.05)；主导眼调节幅度(12.9±3.09)D，非主导眼为(12.6±3.09)D，差异无统计学意义(t=1.49， P=0.14)。

Result: Platelet aggregation rate of pretreatment and 8 weeks after treatment had significant difference, but hemostatic functions were similar. The incidence of cardiac event of two groups had no significant difference. The side effect of Clopidogrel and Ticlopidine had significant difference with granulocytopenia (3.4% vs. 0), gastrointestinal tract response (11.2% vs. 6.3%) and exanthem (9.0% vs. 3.2%) respectively, which need no drug withdrawal.

结果：治疗8周后的血小板聚集率与治疗前相比，差异具有显著性，而止血和血栓功能相似；治疗后两组心脏事件的发生率相似；噻氯匹定与氯吡格雷的副作用中性粒细胞减少（3.4％比0）、胃肠道反应（11.2％比6.3％）、皮疹（9.0％比3.2％），两组差异具有显著性，两组均无需要停药病。

It is the first important step in video analysis and will directly affects the effectiveness of indexing Shot boundary detection is one of our major research interests and we will tackle the following existing problems the ambiguity between gradual change and camera motion, the discontinuity during gradual change, false detection caused by illumination variation and flashlight, automatic threshold selection Firstly, we discuss shot boundary detection in non-compressed domain In chapter 2, we compare some of the commonly used detection methods which are based on frame difference and point out that single feature will not generate good results As a conclusion, we use fuzzy logic to combine multiple features Presently, most frame difference based shot boundary detection algorithms rely on threshold and hence the selection of such thresholds will greatly affect the performance of boundary detection We propose a membership function to define frame difference and calculate the membership with self adaptation according to the statistic distribution of frame differences to satisfy different type of video clips Experiments show that the proposed fuzzy shot boundary detection algorithm can be used with different video types and has a high detection precision and recall In chapter 3, we discuss model-based shot boundary detection algorithms regarding chromatic and spatial editing effects such as fade-in, fade-out, dissolve and wipe Various parameters are proposed to better describe the characteristics of each editing type.

镜头边界的检测是把视频自动地分割为一个个镜头，作为基本的索引单元，因此它是视频分析重要的第一步，直接影响到视频检索的成败。镜头边界的检测是本文研究的重点之一。目前镜头边界检测算法主要存在以下问题：渐变与镜头运动难以区别；渐变过程中的不连续与停顿、光照条件的变化及闪光灯等特殊情况会引起误检测；自动选择阈值比较困难等。本文首先针对非压缩域视频进行了镜头边界检测的研究。在第二章中我们采用了比较流行的基于帧间差的方法。在比较各种帧间差计算方法的基础上，指出使用单一的特征难以取得很好的检测效果，提出用模糊逻辑综合使用各种特征。目前大多数基于帧间差的镜头边界检测算法都采用阈值法进行镜头转换的判别。阈值选择的误差对检测性能有较大的影响，本文提出用隶属度函数定义帧间差较大、中等较大和较小等概念，并根据帧间差的统计分布自适应地确定隶属度，以适应不同类型的视频片断。实验结果表明这种基于糊逻辑的镜头边界检测算法可以适应不同的视频，并具有较高的检测精度和检出率。在第三章中采用基于模型的方法进行镜头渐变的检测，研究了淡入／淡出、慢转换和扫换的模型。

The average lengths of polar axis of Ferula and Heracleum are 29.67 and 34.07μm in which there are significant difference by rank-sum test, but the average width of equatorial axis are 17.07 and 15.65μm in which there are no significant difference, furthermore, the L/W are 1.76and 2.19 in which there are significant difference.

阿魏属和独活属植物的极轴平均长度分别为29.67μm和34.07μm，秩和检验表明二者差异显著；赤道轴平均长度17.07μm和15.65μm，差异不显著；极轴长/赤道宽的平均值分别为1.76和2.19，差异显著。

In this study,we focus on the interaction between nuclear modifier gene MTO2 and aminoglycosides,and have received the following innovations.1,We here report first that the knockout of MTO2 significantly inhibited mtDNA p_(454)~R mutant's sensitivity to aminoglycoside antibiotics.Here are the results:(1)In neomycin GYP medium,when mitochondria genes were wild type,whether MTO2 knockout or not,the growth of yeast strains has no significant difference;when mitochondria genes were complete deletion,whether MTO2 knockout or not,the growth of yeast strains also has no significant difference;Interesting,when mtDNA P_(454)~R,wild-type MTO2 strains were hardly survival in neomycin GYP medium,but the growth of MTO2 knockout strains were only partly inhibited,there was a significant difference performance of neomycin sensitivity between them.

具体结果如下：(1)在含有新霉素的葡萄糖培养基上，mtDNA为野生型、MTO2敲除与否，相应的酵母菌株的生长没有显著差异；mtDNA完全缺失、MTO2敲除与否，相应的酵母菌株的生长也没有显著差异；然而，当mtDNA存在P_(454)~R突变时，MTO2野生型菌株几乎完全不能生长，而MTO2敲除菌株的生长只受到部分抑制，表现二者对新霉素的敏感性存在显著差异。

In this paper, based on an optimum difference operator for spatial differential given by Holberg, an optimum difference method of modeling crosswell elastic wavefield is put forward, which adopts the staggered-grid technique and calculates the wavefield at different grid points. When the half length of optimum difference operator is taken as four to six points, the required number of grid points per wavelength equals to three, crosshole elastic wavefield numerical modeling can attain satisfied accuracy.

本文以Holberg提出的一种空间微分的最佳差分算子为基础，采用交错网格技术，提出了一种模拟井间弹性波场的最佳差分法，该方法能在大空间网格点上得到精确的波场值，当最佳差分算子的半长度取4～6个点，每个波长只采3个样点时，井间弹性波场的模拟就可以得到满意的精度，其计算速度比常规有限差分法至少快一个数量级。

The large altitude difference of the hypsography, the fragmental topography, the difference of exposure and the valley cause the difference of the part climate which make the orographic rain , the topography wind and the temperature inversion.

由于地势高差悬殊、地形破碎和坡向、谷向的不同，常引起局部气候差异，多地形雨、地形风和逆温现象，形成不同的小气候。

Salt is good, but if the salt becomes flat and tasteless, with what do you season it?

14：33 盐本是好的，盐若失了味，可用什么叫它再咸呢？

He reiterated that the PLA is an army of the people under the leadership of the Communist Party of China.

他重申，人民解放军是在中国共产党领导下的人民军队。