Release of Sulfur and Chlorine During Cofiring Rdf and Coal In An Internally Circulating Fluidized Bed

An internally circulating fluidized bed (ICFB) was applied to investigate the behavior of chlorine and sulfur during cofiring RDF and coal. The pollutant emissions in the flue gas were measured by Fourier transform infrared (FTIR) spectrometry (Gasmet DX-3000). In the tests, the concentrations of the species CO, CO2, HCl, and SO2 were measured online. Results indicated when cofiring RDF and char, due to the higher content of chlorine in RDF, the formation of HCl significantly increases. The concentration Of SO2 is relatively low because alkaline metal in the fuel ash can absorb SO2. The concentration of CO emission during firing pure RDF is relatively higher and fluctuates sharply. With the CaO addition, the sulfur absorption by calcium quickly increases, and the desulfuration ratio is bigger than the dechlorination ratio. The chemical equilibrium method is applied to predict the behavior of chlorine. Results show that gaseous HCl emission increases with increasing RDF fraction, and gaseous KCl and NaCl formation might occur.

Universal Greenberger-Horne-Zeilinger-state analyzer based on two-photon polarization parity detection

We present a universal analyzer for the three-particle Greenberger-Horne-Zeilinger (GHZ) states with quantum nondemolition parity detectors and linear-optics elements. In our scheme, all of the three-photon GHZ states can be discriminated with nearly unity probability in the regime of weak nonlinearity feasible at the present state of the art experimentally. We also show that our scheme can be easily extended to the analysis of the multi-particle GHZ states.

High-energy ion emission from cooled deuterium clusters in 20 TW laser fields

High-energy ion emission from intense-ultrashort (30fs) laser-pulse- cooled deuterium-cluster (80K) interaction is measured. The deuterium ions have an average energy 20keV, which greatly exceeds Zweiback's expectation [Phys. Rev. Lett. 84 (2000) 2634]. These fast deuterium ions can be used to drive fusion and have a broad prospect.

Trapping of neutral Rb-87 atoms on an atomchip

We report an experiment of trapping of neutral Rb-87 atoms on a, self-made atomchip. The H-shaped atomchip is made by magnetron sputtering technology, which is different from the atomchip technology of other teams. We collect 3 x 10(6) Rb-87 atoms in the mirror magneto-optical trap (MOT) using the external MOT coils, and 1 X 10(5) Rb-87 atoms are transferred to U-MOT using U-shaped wire in chip and a pair of bias coils.

Report of the Inter-American Tropical Tuna Commission for the year 1982

ENGLISH: SPANISH: La Comisión Interamericana del Atún Tropical funciona bajo la autoridad y dirección de un convenio establecido originalmente por la República de Costa Rica y los Estados Unidos de América. El convenio vigente desde 1950, está abierto a la afiliación de otros gobiernos cuyos ciudadanos pescan atún en el Pacífico oriental tropical. Bajo esta estipulación, Panamá se afilió en 1953, Ecuador en 1961, los Estados Unidos Mexicanos en 1964, Canadá en 1968, Japón en 1970, Francia y Nicaragua en 1973. Ecuador se retiró de la Comisión en 1968, México en 1978 y Costa Rica en 1979. Como se informó en el informe anual de la Comisión de 1978, la XXXVI reunión de la Comisión, convocada en Tokio (Japón) del 16 al 18 de octubre de 1978, fue suspendida sin haberse adoptado ninguna acción para fijar una cuota de atún aleta amarilla en 1979. La XL reunión de la Comisión fue convocada en La Jolla, California (EEUU) del 19 al 21 de octubre de 1982. (PDF contains 296 pages.)

Low loss waveguide in Nd3+-doped silicate glass fabricated by carbon ion implantation

Low loss index enhanced planar waveguides in Nd3+-doped silicate glass were fabricated by 3.0 MeV C+ ion implantation. The enhancement of the refractive index confined the light propagating in the waveguide. The prism-coupling method was used to measure dark modes in the waveguide. The effective refractive indices of the waveguide were obtained based on the dark modes. The moving fiber method was applied to measure the waveguide propagation loss. Loss measured in non-annealed samples is about 0.6 dB/cm. And the waveguide mode optical near-field output at 633 nm was presented. (c) 2005 Elsevier B.V. All rights reserved.

Property studies of optical waveguide formed by 6.0 MeV carbon ion implantation into Nd : silicate glass

Nd:silicate glass was implanted at room temperature by 6.0 MeV C3+ ions with a dose of 2.0 x 10(15) ions cm(-2). A waveguide with thickness of about 6.3 mu m was formed. The prism-coupling method was used to observe the dark modes of the waveguide at 633 nm and 1539 nm, respectively. There are three dark modes at 633 nm, of which one is the enhanced-index mode. The propagation loss of the enhanced-index mode in the waveguide measured at 633 nm is 0.42 dB cm(-1) after annealing at 217 degrees C for 35 min. The reflectivity calculation method was applied to simulate the refractive index profiles in the waveguide. The mode optical near-field output at 633 nm was presented.

Passively Q-switched Yb : YAG laser with Cr4+: YAG as the saturable absorber

By using a continuous-wave Ti:sapphire laser as a pumping source, we demonstrated a passively Q-switched Yb:YAG laser at room temperature with Cr4+:YAG as the saturable absorber. We achieved an average output power of as much as 55 mW at 1.03 mum with a pulse width (FWHM) as short as 350 ns. The initial transmission of the Cr4+:YAG has an effect on the pulse duration (FWHM) and the repetition rate of the Yb:YAG passively Q-switched laser. The Yb:YAG crystal can be a most promising passively Q-switched laser crystal for compact, efficient, solid-state lasers. (C) 2001 Optical Society of America.

Spectroscopic properties of Ce : YAP scintillation crystal grown by temperature gradient technique

Spectroscopic properties of Ce-doped yttrium orthoaluminate (Ce:YAlO3 or Ce:YAP) crystals grown by temperature gradient technique (TGT) were investigated, and the effects of the growth conditions on the properties were analyzed.. Methods of optical absorption (OA), photoluminescence (PL), photoluminescence decay (PLD), X-ray excited luminescence (XL) and cathodeluminescence (CL) were used in these investigations. The results showed that the absorption band peak at 202, 394 and 532 nm originated from F and F+ color center induced by the weak reducing growth atmosphere, green emission band near 500 ran derived from Ce3+ -Ce3+ pairs and band at 650 similar to 850 run from some unintentional impurity in crystals.

Uma intervenção colaborativa sobre os processos de ensino e aprendizagem do aluno com deficiência intelectual

As práticas pedagógicas e processo de ensino e aprendizagem do aluno com deficiência intelectual no ensino comum são o objeto de estudo desta tese. Esta teve por finalidade analisar as estratégias pedagógicas e os suportes educacionais oferecidos para alunos com deficiência intelectual, refletir e elaborar, de forma colaborativa com a equipe pedagógica, ações educativas para a organização do processo de ensino e aprendizagem desse aluno. Para responder à questão inicial do estudo, participamos sistematicamente como pesquisadora do cotidiano escolar do aluno em sala de aula e em outros contextos da rotina das professoras, como reuniões de planejamento, estudos de caso e conselhos de classe. As interfaces metodológicas qualitativas adotadas foram o estudo de caso etnográfico para a 1 etapa e a pesquisa-ação colaborativa para a 2 etapa. Na 1 etapa, fomos a campo para conhecer os processos estabelecidos para a escolarização de três alunos com deficiência intelectual, em anos de escolaridade diferentes, e envolveu 15 profissionais do 1 segmento do ensino fundamental. A partir da análise de conteúdo dos registros do diário de campo, da observação participante, das entrevistas semiestruturadas e filmagens em sala de aula, organizamos as reflexões e análises sobre como é compreendida a deficiência intelectual, as relações que se estabelecem com a aprendizagem e as práticas pedagógicas que envolveram os três alunos. Na segunda etapa, fomos a campo para colaborar com seus atores a partir da proposta do ensino colaborativo, respaldadas pelo referencial histórico-cultural. As ações colaborativas junto às professoras de sala de aula e da sala de recursos multifuncionais (SRM) foram desenvolvidas tendo o aluno Ian como sujeito das reflexões e análises sobre o processo de ensino e aprendizagem. Como resultados do estudo observamos que a presença do aluno com deficiência intelectual na escola comum ainda é motivo de estranhamento. O formato da estrutura curricular indica o quanto é difícil garantir processos de ensino e aprendizagem para o aluno com deficiência intelectual. Apesar do perfil diferenciado na formação das professoras, dúvidas sobre como organizar o ensino para esse aluno eram comuns em seus relatos. A partir da colaboração estabelecida, na 2 etapa do estudo, entre as professoras especialistas (da SRM e pesquisadora) e as professoras de sala de aula, observamos essas ampliarem a iniciativa na organização/adequação de atividades, em suas áreas de conhecimento específicas, considerando a participação e forma pela qual o aluno poderia adquirir o conhecimento trabalhado. Nesse contexto, percebemos a relevância da complementaridade entre estratégias pedagógicas para garantir o ensino, a participação e a aprendizagem do aluno, tanto em sala de aula quanto na SRM. As práticas favoreceram o aluno na medida em que as condições de ensino, para sua aprendizagem, passaram a ser conhecidas e consideradas. A mediação planejada, intencional e desafiadora, em todos os ambientes da escola, foi fundamental para que compreendêssemos como organizar o ensino para a aprendizagem de Ian. Sob essas condições observamos Ian demonstrar sua capacidade para elaborar conceitos cotidianos e complexos, em diferentes áreas do currículo escolar.