First integrals of the discrete nonconservative and nonholonomic systems

来源 :中国物理(英文版) | 被引量 : 0次 | 上传用户:wxm2000
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
In this paper we show that the first integrals of the discrete equation of motion for nonconservative and non holonomic mechanical systems can be determined explicitly by investigating the invariance properties of the discrete Lagrangian. The result obtained is a discrete analogue of the generalized theorem of Noether in the Calculus of variations.
其他文献
The intermittency effect has been studied for an interaction of 3.7 A GeV 16O with emulsion using the distributions of both the pseudorapidity intervals and the
倒伏是影响小麦高产稳产的重要因素。本研究以豫麦57(父本)和花培3号(母本)培育的双单倍体群体(DH population)为材料,在两年九个环境下,对茎秆基部节间解剖结构、机械特性、节
The melting curve of MgSiO3 perovskite is simulated using molecular dynamics simulations method at high pressure. It is shown that the simulated equation of sta
When both intermolecula dipolar couplins (D couplins)and intramolecular scalar Couplings(J couplings) exist in a highly poarized multiple-spin liquid, some forb
本研究利用分子标记技术对82份青海育成小麦品种(系)资源中矮秆基因分布情况、Ppo基因等位变异、Wx糯蛋白亚基缺失情况以及puroindoline变异类型评价,以便进一步了解我省小麦的品质现状。使具有优良面粉品质的小麦品种的筛选更有目的性和高效性,与此同时,产量也较一般小麦可观,这对未来选育优质高产小麦具有很重要的指导作用。1、为系统了解青海小麦矮秆基因的分布特点,并进一步为青海高原小麦的株高育种
利用黄河下游平原古湖冷水沟310 cm柱状岩芯沉积物粒度和地球化学元素分析,结合剖面8个AMS-14C测年结果所建立的时间标尺,初步恢复了冷水沟地区2364~1000cal.aB.P.的气候干湿
The dynamical properties of quantum entanglement in an integrable quantum dimer are studied in terms of the reduced-density linear entropy with various coupling
Along the geodesic we calculate the interference phase of the mass neutrinos propagating in the radial direction in Robertson-Walker space-time. Since our unive
本研究针对青海省6个辣椒主产区(西宁市、海东市、黄南州、海西州、海北州、海南州)进行辣椒疫霉菌的采样调查,共分离纯化出357株辣椒疫霉菌,选择其中80株病菌作为研究对象进
The possibility of cooling a system from liquid helium temperature, 4.2 K, using a tunnel junction refrigerator is analysed. Calculations show that the device c