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Ringel realized positive parts of semisimple Lie algebras in the framework of Ringel-Hall algebras. The main result of this thesis is to build a geometric and topological model over triangulated categories such as derived categories and stable module categories of repetitive algebras. We defines a Lie bracket by Euler characteristics of constructible subsets and thus realizes infinite dimensional Lie algebras of various types with non-degenerated bilinear form.

本文的主要结果是在导出范畴和重复代数的稳定模范畴等三角范畴水平上建立相应的几何-拓扑模型,并利用相应可构集的欧拉示性数定义了一个Hall代数的交换子乘法,从而在三角范畴水平上实现了一大类无限维李代数的整体构造,并且这类李代数本质上都具有非退化的不变双线性型。

When the slip-form paver is used in curbstone concrete spreading construction,because the grade of designed curbstone concrete is comparatively superior and its thickness is comparatively thin,the crack resistance and the construction workability of concrete are usually bad in construction.

采用滑模摊铺机进行路缘石混凝土摊铺施工时,由于设计路缘石混凝土标号较高,厚度较薄,在施工中往往出现混凝土抗裂性差以及施工和易性不好等缺点,通过试验,在混凝土中掺加适量的粉煤灰,可对路缘石的施工质量有很大的改善和提高。

In [3], Professor Wang Xian-dong discussed the evaluation modules of Loop algebras of Lie algebras with a triangular decomposition; particularly, irreducibility of the tensor product of finitely many such modules was partially determined.

在[3]中,王宪栋教授讨论了可三角分解李代数其Loop代数的赋值模;特别值得一提的是,在一定程度上确定了有限多个赋值模其张量积的不可约性。

For different polynomials g, if the characteristic polynomial of a n matrix A is irreducible, then we get some theorems to determine matrix equations g =A solvable; if it is reducible, then, to see n-dimension space vectors M over a field F as F-module, we use module theory to determine these equations solvable such that it is simpler and clearer to investigate these questions.

对于不同多项式g,当n阶矩阵A的特征多项式为不可约的,我们给出了矩阵方程g=A有解的判定定理;当A的特征多项式为可约的,把域F上的n维线性空间M作为由A导出的F -模,我们利用模论知识来决定矩阵方程g=A有解性,从而使这一问题变了简单,研究思路更加清晰。

Based on the wave equation in the acoustic fluid space and the theory of thin-wall structure, the uncoupling error in low frequency range about the nonsymmetrical coupled structure-acoustic analysis equation is studied.

该对称模型特征值的非负性及特征问题的可降阶性也在本文中进行了深入研究,同时指出了在复模态分析中应当注意的问题;(2)由声空间波动方程和薄板理论出发,对非对称声振耦合方程的低频解耦误差问题进行了研究。

Resultantly, the individual warm/cold events in ENSO cycle appear to be partially locked to the annual cycle, and also exhibit obvious irregularity both in amplitude and in lasting time.

本文第四章研制设计了一包含海洋表面边界层和大气辐合反馈过程的热带太平洋海气耦合异常模式,进而利用该模式对ENSO循环进行了较为真实的模拟,通过对模式ENSO循环的演变特征及其形成机制的细致分析,建立了-ENSO循环的非线性分析模式,并提出了ENSO循环形成的一种更为客观的理论,指出:1)和观测事实类似,模式ENSO循环确实涉及了三种主要时间尺度过程即LF、QB和AC,其中LF为3-4年主周期振荡,QB占总方差10~20%;2)ENSO循环的正反馈机制是不稳定海气相互作用过程,且这一不稳定过程的发展在暖态中明显强于冷态;3)ENSO循环的负反馈机制在冷暖态中表现不同,在冷态消亡过程中,这种负反馈过程主要表现为西边界反射产生的时滞效应,但在暖态消亡过程中不存在类似的时滞效应,其负反馈过程主要表现为在海气耦合不稳定充分发展时伴随的赤道两侧冷水上翻过程的加强以及非线性过程的衰减作用抑制了不稳定的发展并最终使得系统回复至冷态;4)ENSO循环的3-4年主周期振荡是一非线性系统的自激振荡现象,其形成是线性系统的本征模即准两年振荡通过非线性机制产生的周期加倍所致,其中&单向性&大气辐合反馈加热过程对其形成至关重要;5)虽然年循环过程对ENSO循环形成没有本质影响,但它可明显影响ENSO循环的具体振幅和位相,使得ENSO对季节循环有明显的&锁相&特征,并且也使得ENSO循环在振幅大小和时间长短方面呈现出明显的不规则性。

Based on this phenomenon, regulating and improving salt resistance of Rumex bucephalopherus with optimal SCR was put forward.

在10cmol/LNaCl条件下,溶液中的SCR调控至10~15时,可明显促进酸模根系、地上部分及叶的生长,提高酸模的抗盐性。

In this study, the dynamic effect of different types of motor rotor, including the interference fit and clearance fit, are discussed by the experiment of modal testing and theoretical analysis.

本文藉由模态测试与分析分别探讨马达转子干涉配合及间隙配合於心轴上所造成的动态特性影响,并提出可的有限元素建模方式,藉由模态测试与有限元分析结果的比对显示,证明此种建模方式之确性,能做为未工具机主轴设计开发考。

Multi-section temperature control,multi-section injection pressure,emitting speed,counter pressure neutral adjustment,applicable to precise molding of plastic accessories

多段温度控制,多段射出压力,射速、背压无限调整,适合精密朔料零件成型。8。可加装单模用滑板,或双模交替式滑板,以增加作业性及效率性。

For the same quantity of module, using well transparent and well-proportional faceplate can acquire high luminous intensity.

在模组数量相同条件下,使用透光性和混色性好的面板可在其表面上获得较高的光照度。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力