A. douady had suggested to study dynamics of biquadratic polynomials. by definition, a biquadratic polynomial is the composition of two quadratic polynomials, so it is an even quartic polynomials which can be written as f ( z ) = z4 + az2 + 6, where a, b are parameters. it is easy to see that / has a critical point at 0 and two symmetric critical points at
A . douadv曾建議對雙二次多項式的動力系統進行研究,所謂雙二次多項式就是兩個二次多項式的復合,也即
偶四次多項式,在一個線型共軛下可以記為fz ) = z ~ 4 + z ~ 2 + b ,這里o , b是參
數,點0是它的一個臨界點,另外還有兩個對稱的臨界點( ( - a ) 、 2 ) ~ 2 。
The approximation analysis result of band dipole model is obtained on the basis of the theory of mfl. the electromagnetic distribution feature of the defect in the steel panel is studied by means of simulation. the leakage magnetic distribution of the two defects and four defects plural and the defects in the column differently in the width are also assayed. conclusions that factors affecting flaw magnetic leakage to the panel also affect the column and magnetic leakage bx should be the feature of the flaw identification to several flaws are drawn
在對漏磁檢測原理進行詳細介紹的基礎上,得出了帶
偶極子模型的近似解析解,並以有限元
數值模擬分析為主要手段,以鋼板上缺陷為對象,分析了各因素對缺陷漏磁場產生影響的不同規律,同時模擬分析了板上平行的兩條裂紋,四條裂紋以及柱體上寬度不同時的裂紋的漏磁場分佈特徵,得出結論:影響板上缺陷漏磁場的諸因素會對柱體上缺陷漏磁場產生同樣的影響;對于多條裂紋,宜用漏磁分量bx作為缺陷識別的特徵量。
The paper analyzed safety level of certain road in tongzhou district of beijing by multivariate regression empirical bayes approach. result of the analysis effectively overcomes the chanciness of historical accident data
本文利用多元回歸經驗貝葉斯法分析了北京市通州區某道路的安全水平,分析結果有效的克服了歷史事故
數據的
偶然性。
This classification is called the parity of the permutation analogous to the definition of parity of integers.
這種分類叫作置換的奇
偶性,類似於整
數偶性的定義。
It was quite on a par with the quixotic idea in certain quarters that in a hundred million years the coal seam of the sister island would be played out and if, as time went on, that turned out to be how the cat jumped all he could personally say on the matter was that as a host of contingencies, equally relevant to the issue, might occur ere then it was highly advisable in the interim to try to make the most of both countries, even though poles apart
這種見解就跟一部分人所持的那種再過一億年,愛爾蘭島的姊妹島不列顛島的煤層就將被挖掘一空這一堂吉訶德式的看法如出一轍。隨著時間的推移,即便形勢的發展果如所料,關于這個問題他個人至多也只能說:在這之前會接連發生無
數偶然事件,對于引發這一結局將同樣有著關連盡管兩國之間的分歧大得簡直是南轅北轍,眼下總還是以竭力相互利用為宜。
Square number couple theory
方形
數偶理論
Polyurethane composites contained different content of alumina and silicon dioxide particles were prepared, and the alumina particle was processed with two kind of silane coupling agent which models were kh550 and kh560
論文分別制備了al _ 2o _ 3顆粒及白碳黑增強的聚氨酯復合材料,考查了填料種類、填料體積分
數、
偶聯劑種類對聚氨酯復合材料力學性能及沖蝕磨損性能的影響。
By the first columns of aigner matrix and its inverse, we characterize the concept of catalan - like number pair and discuss their properties
通過aigner陣及其逆的第一列,刻畫了catalan - like
數偶的概念,討論了它們的若干性質。
The current trends of this field is to acquire the current density of dipole distribution rather than a few dipoles. based upon that, a new model was proposed - dipole layer localization method ( dllm ) : spherical dipole layer was used as source model, on which dipoles were distributed by equilateral triangles ; three concentric inhomogeneous sphere was used as head model, which contains scalp, skull and cortex with different conductance. the dipole distribution and scalp potential tomography were obtained with singular value decomposition ( svd )
鑒于該領域的研究趨勢已從求取少
數偶極子過渡到
偶極子分佈密度的獲得,本文提出了新的模型? ?
偶極面定位方法( dipolelayerlocalizationmethod , dllm ) :以等邊三角形均勻分佈的
偶極子構成的
偶極面(球面)作為源模型;包括頭皮、顱骨和皮層的三層同心介質球作為頭顱模型,運用奇異值分解來求解逆問題,從而獲得
偶極子分佈和頭皮電位分佈,實現三維成像。
The second chapter of the thesis discuss emphatically the development, algorithm, remarks and present problems of dmrg. besides, we try to add odd or even sites to the rung of a two - leg coupled spin ladder, and to calculate the energy and spin gap of the class of models
第二章主要講述了dmrg的發展、方法步驟、應用評價,目前所面臨的問題,並嘗試在兩條耦合海森堡鏈的階梯模型的「橫檔」上分別加入奇
數、
偶數今格點。
In the end, bent function pair mates are given, which increase the constructions of the families of bent complementary function pairs
最後,提出了bent函
數偶侶的概念,擴充了bent互補函
數偶族的構造方法。
Then, these constructions of the families of bent complementary function pairs that are based on some special arrays, for example orthogonal column arrays and dyadic perfect arrays, are studied
然後,研究了利用列正交陣列、並元最佳陣列偶而得到的bent互補函數偶族的構造方法。