Ensa��smo e filosofia em Theodor W. Adorno

O estudo aborda o problema da forma de exposi����o do pensamento filos��fico a partir da defesa da forma do ensaio na obra de Theodor W. Adorno. O que se p��e em quest��o �� o quanto a forma ensa��stica, em seu esfor��o de elaborar conceitualmente os dados da experi��ncia particular, �� capaz de dar conta da atividade filos��fica - uma atividade universalista e interessada na determina����o dos fundamentos ��ltimos do real - em um momento hist��rico no qual n��o parece ser mais poss��vel a ela erguer pretens��es de sistema. Em seu desenvolvimento este trabalho se volta para a pr��pria ensa��stica adorniana e procura mostrar se e em que medida ela escapa do esp��rito pr��prio dos sistemas fechados.

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133-W pulsed fiber amplifier with large-mode-area fiber

A master-oscillator fiber power amplifier (MOPA) system with a 4-m-long Yb3+-doped homemade large mode area (LMA) double-clad fiber is reported. The system emits up to 133.8 W of amplified radiation at a wavelength of 1064 nm and a repetition rate of 100 kHz, limited only by the available pump power. Peak power of 300 kW at 20 kHz with a pulse duration of 15 ns is obtained. (c) 2006 Society of Photo-Optical Instrumentation Engineers.

133-W pulsed fiber amplifier with large-mode-area fiber

A master-oscillator fiber power amplifier (MOPA) system with a 4-m-long Yb3+-doped homemade large mode area (LMA) double-clad fiber is reported. The system emits up to 133.8 W of amplified radiation at a wavelength of 1064 nm and a repetition rate of 100 kHz, limited only by the available pump power. Peak power of 300 kW at 20 kHz with a pulse duration of 15 ns is obtained. (c) 2006 Society of Photo-Optical Instrumentation Engineers.

110-W fiber laser with homemade double-clad fiber

A high-power ytterbium-doped fiber laser (YDFL) with homemade double-clad fiber (DCF) is introduced in this letter. The geometric parameter and laser characteristics of the fiber have been studied. With one-end-pumping scheme, pumped by a high-power laser diode with launching power of 280 W, a maximum continuous wave (CW) output of 110 W is obtained with an optical-to-optical efficiency of 40%.

20-W average power, high repetition rate, nanosecond pulse with diffraction limit from an all-fiber MOPA system

In this article, we report an all-fiber master oscillator power amplifier (MOPA) system, which can provide high repetition rate and nanosecond pulse with diffraction-limit. The system was constructed using a (2 + 1) X 1 multimode combiner. The Q-Switched, LD pumped Nd:YVO4 solid-state laser wets used (is master oscillator. The 976-nm fiber-coupled module is used as pump source. A 10-m long China-made Yb3+-doped D-shape double-clad large-mode-area fiber was used as amplifier fiber. The MOPA produced as much as 20-W average power with nanosecond pulse and near diffraction limited. The pulse duration is maintained at about 15 its during 50-175 kHz. The system employs a simple and compact architecture and is therefore suitable for the use in practical applications such as scientific and military airborne LIDAR and imaging. Based oil this system. the amplification performances of. the all fiber amplifier is investigated. (C) 2008 Wiley Periodicals, Inc.

Laser-diode-pumped Cr4+,Nd3+: YAG with self-Q-switched laser output of 1.4 W

By use of a laser diode as a pump source, a self-Q-switched laser from a Cr,Nd:YAG crystal is demonstrated. The output Q-switched traces are very stable, the threshold pump power is 3.5 W, the pulse duration is 50 ns, and the slope efficiency is as high as 20%. In addition, the pulse width remains constant while the pulse repetition rate Varies with pump power. (C) 2000 Optical Society of America OCIS codes: 140.0140, 140.2020, 140.3380, 140.3480, 140.3540, 140.3580.

Frances E. W. Harper and Pauline E. Hopkins: the uplifting of black women through literature

A presente disserta����o tem como objetivo apresentar duas influentes autoras afro-americanas do s��culo XIX, Frances E. W. Harper e Pauline E. Hopkins. Ambas as autoras, atrav��s de seus romances Iola Leroy, or, Shadows Uplifted (1892) e Contending Forces: a Romance Illustrative of Negro Life North and South (1900) respectivamente, entrela��am fic����o e hist��ria com o prop��sito de criar novas alternativas de discurso, afastando-se, portanto, do oficial. Ademais, o presente trabalho prop��e demonstrar como Frances Harper e Pauline Hopkins fazem uso do espa��o liter��rio com a finalidade de escrever a hist��ria do oprimido, permitindo, principalmente, que as mulheres afro-americanas dessem voz as suas experi��ncias e as suas pr��prias hist��rias. Assim sendo, a literatura produzida por Frances e Harper e Pauline Hopkins ser�� analisada como forma de empoderamento da comunidade afro-americana, principalmente como forma de aquisi����o de poder para as Mulheres Afro-Americanas.

7.3 W of single-frequency output power at 2.09 μm from an Ho:YAG monolithic nonplanar ring laser

Single-frequency output power of 7.3 W at 2.09 mu m from a monolithic Ho:YAG nonplanar ring oscillator (NPRO) is demonstrated. Resonantly pumped by a Tm-doped fiber laser at 1.91 mu m, the Ho:YAG NPRO produces 71% of slope efficiency with respect to absorbed pump power and nearly diffraction-limited output with a beam quality parameter of M-2 approximate to 1.1. (c) 2008 Optical Society of America