共查询到20条相似文献,搜索用时 46 毫秒
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由国际纯粹与应用物理联合会(International Union of Pure and Applied Physics,IUPAP)于2002年发起并赞助召开的关于女物理工作者国际研讨会(International Conference on Women in Physics,ICWIP)系列会到2011年已经是第四届.继法国巴黎(2002年)、巴西里约热内卢(2005年)和韩国首尔(2008年)三次盛会之后,第四届IUPAP女性物理工作者国际会议于2011年4月5日至8日在南非 相似文献
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“中国物理学会第五届教学委员会第二次全体(扩大)会议”会议纪要 总被引:1,自引:0,他引:1
《大学物理》1995,(8)
“中国物理学会第五届教学委员会第二次全体(扩大)会议”会议纪要(1995年4月9日)“中国物理学会第五届教学委员会第二次全体(扩大)会议”于1995年4月7日-9日在合肥中国科学技术大学顺利召开。出席会议的委员和代表有55人,中国物理学会第五届教学委... 相似文献
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英国“桑普森”多功能雷达的新进展 总被引:1,自引:0,他引:1
英国《简氏防务周刊》2006年3月15日报道,BAE系统公司的综合系统技术分公司计划于今年5月份向承包商的试验基地交付首套试生产“桑普森”多功能雷达(P1雷达)。第2套试生产的雷达(P2雷达)将于8月份装备在“长弓”号制导武器试验驳船上。第3套试生产的雷达系统(P3雷达)将在2006年的下半年交付给位于朴次茅斯附近的海上集成与保障中心(MISC)。 相似文献
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笔者最近有机会听了一些老师的初中物理课,在一些老师的“内能”概念教学实践中,笔者发现他们总是在想方设法运用各种教学手段强调如下两个教学要点: 相似文献
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一类不连续不可逆保面积映象可以展示类似耗散的行为,因此可称其为“类耗散系统”.在一种类耗散系统中观察到了椭圆周期轨道及其周围的椭圆岛与映象不连续边界碰撞而消失的现象.周期轨道消失后,经过一系列过渡椭圆周期轨道之后,系统的行为由一个混沌类吸引子主导.在混沌类吸引子刚刚出现时,混沌时间序列呈现层流相与湍流相的无规交替.这一切都与不连续耗散系统中发生的Ⅴ型阵发的相应性质十分相似,因此可称为“类Ⅴ型阵发”.然而,当混沌类吸引子刚刚出现时,仅可以找到最后一个过渡椭圆岛的“遗迹”,并不存在它的“鬼魂”,因此类Ⅴ型阵发不遵从Ⅴ型阵发的特征标度规律.反之,混沌类吸引子的鬼魂却存在于最后一个过渡椭圆周期轨道的类瞬态过程中,因此在类Ⅴ型阵发导致混沌运动的临界点之前,由此“类瞬态混沌奇异集”中逃逸的规律就成为标志这一种临界现象的标度律.这与Ⅴ型阵发又根本不同.
关键词:
类耗散性
类混沌吸引子
类Ⅴ型阵发 相似文献
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Nasuno S 《Chaos (Woodbury, N.Y.)》2003,13(3):1010-1013
Highly localized, dynamic particle-like excitations are observed in a dc-driven, quasi-two-dimensional gas-discharge system. These localized excitations undergo a transition from isolated to aggregated state as the discharge current is increased. Although they provide us a macroscopic analogue of microscopic atoms and molecules, they are quite distinct from the latter in the point that they exhibit a rich variety of complex dynamics. The fact that these localized excitations can show synchronous dynamics even in distant places, together with recent theoretical studies, indicates that a global coupling plays an important role on the dynamics of such localized excitations. 相似文献
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Shvartsburg AA Hudgins RR Dugourd P Gutierrez R Frauenheim T Jarrold MF 《Physical review letters》2000,84(11):2421-2424
The hypothesis that fullerenes grow in a carbon plasma by the addition of C2 units (the "fullerene road") has been widely acclaimed as the most plausible mechanism for formation of larger fullerenes including C60 and C70. Calculations suggest that the association of C2 with fullerenes proceeds through two classes of intermediates, "sticks" and "handles." Here we report the observation of these species using high-resolution ion-mobility measurements for C(n) cations generated by laser vaporization of graphite and laser desorption of C60. Sticks with up to eight-atom chains have also been found. 相似文献
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Gromnitskaya EL Yagafarov OF Stalgorova OV Brazhkin VV Lyapin AG 《Physical review letters》2007,98(16):165503
We present the ultrasonic study of gallium (Ga I) under high pressure up to 1.7 GPa, including the measurements of the density and elastic properties during phase transitions to Ga II and to a liquid state. The observed large drop of both bulk and shear moduli (by 30% and 55%, correspondingly) during the phase transition to Ga II, as well as the increase of the Poisson's ratio from typically "covalent" ( approximately 0.22) to "metallic" ( approximately 0.32) values, experimentally testifies to the coexistence of a molecular and metallic behavior in Ga I and to the disappearance of the "covalency" during the transition to Ga II. A high value of the pressure derivative of the bulk modulus for Ga I and the increase in the Poisson's ratio can be associated with the weakening of the covalency in compressed Ga I and considered as a precursor of the transition to normal metal. 相似文献