爆炸容器内冲击波系演化及壳体响应的数值研究

对中心装药爆炸后冲击波的产生、传播和壳体动态响应全过程进行了数值研究。认为RDX瞬时爆炸，爆炸近场采用自相似解；冲击波传播和波系演化采用PPM(the Piecewise Parabolic Method)格式求解Euler方程；壳体响应采用有限元方法求解拉氏坐标系下由虚功原理得到的动力学方程。壳体内壁面边界条件分别采用强耦合和弱耦合方法处理。结果表明：（1）当装药量相同时，薄壁壳体振型比厚壁宙体复杂得多，振幅也大；（2）当装药量不同，壳体厚度相同时，爆炸场冲击波的演化过程不同；（3）对少量装药，产生的冲击波强度低，壳体变形小，是否考虑内边界运动，对计算结果的影响不大；（4）在本文条件下，爆炸容器封头顶点所受的载荷最大，是取易发生破坏的地方，侧壁与爆点所在横截面的交线，也易破坏。

离子束外延制备GaAs:Gd薄膜

　室温条件下,用低能离子束外延制备了GaAs∶Gd薄膜,X射线衍射(XRD)结果表明除了GaAs衬底峰没有发现其它新相的衍射峰,并借助于高分辨X射线衍射(HR XRD)进一步分析了晶格常数的变化特点。俄歇电子能谱(AES)分析了样品表面的成分,及元素随深度的分布规律,在60nm深处元素的相对含量发生明显改变,运用原子力显微镜(AFM)揭示了样品表面的形貌特点。

Desarrollo de la herramienta Admintool usando tecnología .NET

Desarrollo de la herramienta ADMINTOOL para administración de la plataforma Microsoft (Active Directory , Permisos NTFS), en base a tecnologia .NET

Collecção das Leis do Imperio do Brazil de 1829

Parte 1 - Atos do Poder Legislativo

Proceedings of the Twenty-second Annual Symposium on Sea Turtle Biology and Conservation, 4-7 April, 2002, Miami, Florida

The 22nd Annual Symposium on Sea Turtle Biology and Conservation was held April 4-7, 2002 in Miami, Florida and hosted by the U.S. Fish and Wildlife Service. The 22nd symposium was the most globally diverse ever with 839 individuals from 73 countries attending the symposium and associated regional meetings. One third of the attendees were from outside the United States. This diverse attendance was made possible in large part because of substantial donations from The Packard Foundation, National Fish and Wildlife Foundation, National Marine Fisheries Service, U.S. Fish and Wildlife Service, Convention on Migratory Species, Oceanic Research Foundation, and International Sea Turtle Society which supported travel grants for 170 international travelers. (PDF contains 336 pages)

Alternativas operacionales en tecnologías de oxidación avanzada para el tratamiento de efluentes de alta carga contaminante

336 p.

两层液体Bénard-Marangoni对流的实验研究

采用粒子图像测速技术(PIV)对两层流体B(en)ard-Marangoni对流进行了实验研究.研究了各种不同厚度比下的临界对流模式,同时研究了在温差变大时向超临界对流模式转化过程.实验结果表明,界面张力对各种对流模式的形成和转变具有重要的作用.

相对论飞秒激光脉冲在真空中对预加速电子的加速

通过求解电子运动的相对论方程，发现预加速电子在超强超短激光脉冲的作用下可以获得很高的能量增益．飞秒激光脉冲的上升沿在焦点附近的区域有效加速电子后，电子和光脉冲一起传播一段距离（远大于瑞利长度）后，激光强度变得很弱，从而使脉冲下降沿对电子的减速作用可以忽略不计，因此电子只经历加速过程而没有被减速，当电子和光脉冲分离时，电子获得了很高的能量增益．当光强为10^19W／cm^2，电子的初始能量为MeV量级时，电子的能量增益可以达到0．1GeV．进一步讨论了电子的能量增益与电子的初始条件与激光脉冲的参数之间的关系

Report of the Inter-American Tropical Tuna Commission for the year 1995

ENGLISH: The Inter-American Tropical Tuna Commission (IATTC) operates under the authority and direction of a convention originally entered into by Costa Rica and the United States. The convention, which came into force in 1950, is open to adherence by other governments whose nationals fish for tropical tunas and tuna-like species in the eastern Pacific Ocean. Under this provision Panama adhered in 1953, Ecuador in 1961, Mexico in 1964, Canada in 1968, Japan in 1970, France and Nicaragua in 1973, Vanuatu in 1990, and Venezuela in 1992. Ecuador withdrew from the IATTC in 1968, Mexico in 1978, and Canada in 1984. The IATTC held its 55th meeting in La Jolla, California, USA, on June 13-15, 1995. SPANISH: La Comisión Interamericana del Atún Tropical (CIAT) funciona bajo la autoridad ydirección de un convenio suscrito originalmente por Costa Rica y los Estados Unidos de América. El convenio, vigente desde 1950, está abierto a la afiliación de cualquier país cuyos ciudadanos pesquen atunes tropicales y especies afines en el Océano Pacífico oriental. Bajo esta estipulación, la República de Panamá seafilióen 1953, Ecuadoren 1961, México en 1964, Canadáen 1968,Japónen 1970, FranciayNicaragua en 1973, Vanuatu en 1990, y Venezuela en 1992. Ecuador se retiró de la CIAT en 1968, México en 1978, y Canadá en 1984. La CIAT celebró su 55a reunión en La Jolla, California (EE.DU.) del 13 al15 de junio de 1995. (PDF contains 336 pages.)