Gain saturation in gas flow and chemical lasers

A theoretical model for gain saturation in gas flow and chemical lasers is presented. The theory is applicable to all possible numerical values of τ/τc, where τ is the characteristie flow time for the flowing gas to move across the laser action region and τc is the characteristic collision relaxation time. The saturation effects of the convection and the "source flow" of the inverted population are revealed. A general relation of gain coefficient and some new gain saturation laws are obtained. For the special case of τ/τc1, the present theoretical results agree with the experimental results on the "anomalous" saturation phenomena in the supersonic diffusion HF chemical laser determined recently by Gross and Coffer[8]. The theory also agrees with the measured results of saturation intensity varying with τ/τc in gas flow CO2 lasers[7]. For the special case of τ/τc1, the present theory is consistent with both the standard theory[1] for gas lasers where the gas has no macroscopic motion and the known gain saturation theory[2-5] for gas flow and chemical lasers.

采动影响下覆岩垮落过程的数值模拟

应用岩层破断过程分析SFPA2D系统 ,分析了采动影响下覆岩破坏的动态发展过程。数值模拟再现了上覆岩层离层、弯曲、沉降、开裂直至冒落的全过程 ,以及采动工作面推进过程中逐步演化的应力场和应变场。根据数值模拟的结果 ,初步探讨了覆岩破断机理 ,指出覆岩的破断特征受分步开挖引起的应力重新分布及其损伤积累以及岩梁的非均质性的影响。

A note on collusion sustainability with optimal punishments and detection lags

In this note we characterize optimal punishments with detection lags when the market consists of n oligopolistic firms. We extend a previous note by Colombo and Labrecciosa (2006) [Colombo, L., and Labrecciosa, P., 2006. Optimal punishments with detection lags. Economic Letters 92, 198-201] to show how in the presence of detection lags optimal punish- ments fail to restore cooperation also in markets with a low number of firms.

驱油体系的驱油效率及其在模拟岩芯表面的润湿性研究

为了研究驱油体系在模拟岩芯表面的润湿性，为微重力应用研究提供依据，选择胜利纯梁采油厂c6—41井原油，应用正交实验设计，通过最低瞬时界面张力测定，筛选出阴离子表面活性剂sDc—V、非离子表面活性剂FBB、HPAM和复碱的驱油体系配方．开展室内模拟驱油实验，同时测定驱油体系溶液对模拟岩芯的接触角，并且关联驱油效率和接触角之间的关系，发现驱油效率越高，接触角值越小．

El estupro. Sexualidad delictiva en la Baja Edad Media y primera Edad Moderna

[ES]Análisis del delito de estupro en los siglos XIV y XVII en los reinos de Castilla y de Navarra a través de la legislación y las fuentes judiciales.

La civilización vasca medieval: vida(s), cotidiana(s), mentalidad(es) y cultura(s)

[ES]A lo largo de las páginas de este trabajo se pasa revista a diversas cuestiones que permiten realizar una aproximación a las diversas formas de vida cotidiana y mentalidad del País Vasco y Navarra durante los siglos bajomedievales. Esas cuestiones aluden al primum vivere, al ciclo vital, al control de la vida privada de los individuos y pública de las comunidades por parte de las autoridades, las fiestas, las supersticiones y distintos aspectos relativos a la cultura, como literatura, historiografía y arte.

Caminhos decisórios de CPIs : uma descrição desde a criação até o relatório final

Descreve os processos decisórios que levam à constituição de uma Comissão Parlamentar de Inquérito (CPI), bem como seus processos internos de decisão e produção do relatório final. A pesquisa foi feita com bases comparativas entre as CPIs e sua estrutura e os modelos de tomada de decisão e estrutura organizacional de Mintzberg.

Collecção das Leis do Imperio do Brazil de 1832

Parte 1 - Atos do Poder Legislativo

Collecção das leis do Imperio do Brasil de 1871

Parte 1 - Atos do Poder Legislativo

Traducciones de teatro inglés en la colección "Teatro selecto, antiguo y modeno, nacional y extranjero (1866-1869)"

Santamaría, José Miguel; Pajares, Eterio; Olsen, Vickie; Merino, Raquel; Eguíluz, Federico (eds.)

郭永怀先生诞辰九十周年纪念文集

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