1,257 research outputs found
VanBoven_Supplemental_Material – Supplemental material for Psychological Barriers to Bipartisan Public Support for Climate Policy
No full textSupplemental material, VanBoven_Supplemental_Material for Psychological Barriers to Bipartisan Public Support for Climate Policy by Leaf Van Boven, Phillip J. Ehret, and David K. Sherman in Perspectives on Psychological Science</p
Supplemental Material, SPPS758709_suppl_mat - Partisan Barriers to Bipartisanship: Understanding Climate Policy Polarization
No full textSupplemental Material, SPPS758709_suppl_mat for Partisan Barriers to Bipartisanship: Understanding Climate Policy Polarization by Phillip J. Ehret, Leaf Van Boven, and David K. Sherman in Social Psychological and Personality Science</p
Estudo das ligas intermetalicas Cu33AL67 e Fe33Sn67 nanoestruturadas preparadas por mechanical alloying
No full textDissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas.Este trabalho é parte de um amplo projeto de pesquisa sobre materiais nanoestruturados fabricados por Mechanical Alloying que o Grupo de Física do Estado Sólido da UFSC vem realizando. As ligas Fe33Sn67 e CU33Al67 possuem grande importância tecnológica. Devido as elevadas diferenças nos pontos de fusão dos elementos químicos, a obtenção destas ligas pelas técnicas convencionais apresentam grandes dificuldades, sendo estas superadas quando a técnica Mechanical Alloying é utilizada para a fabricação das mesmas. As técnicas de difração de raios-x e calorimetria diferencial de varredura (DSC) foram usadas no estudo das propriedades estruturais destas ligas. Os difratogramas de difração de raios-x da liga Fe33Sn67 tal como coletada e tratada termicamente foram indexados a uma rede tetragonal denominada de fase , com parâmetros de rede a = b = 6,5234 Â e c = 5,3373 Â e, a = b = 6,5369 A e c = 5,3328 Â, respectivamente. O tamanho médio encontrados para os cristalitos foram L = 164 A e L = 297 A, respectivamente. Os padrões de difração de raios-x da liga CU33Al67 tal como foi coletada e tratada termicamente foram indexados a uma rede tetragonal denominada de fase O, com parâmetros de rede a = b = 6,0636 Â e c = 4,8848 Â e, a = b =6,0547 Â e c = 4,8719 Â, respectivamente e a uma rede cúbica de face centrada (alumínio) com parâmetros de rede a = 4,0994 Â e a = 4,0993 Â, respectivamente. O tamanho médio calculados para os cristalitos da fase tetragonal foram L = 80 Â e L = 358 Â e, para a rede fc.c. foram L = 109 Â e L = 360 Â. O tratamento térmico precipitou uma nova fase na liga CU33Al67, sendo esta, possivelmente, monoclínica com o tamanho médio dos cristalitos em tomo de L = 294 A. Portanto, neste trabalho, obtemos ligas com uma estrutura nanométrica. O programa DBWS, utilizado para simular padrões de difração de raios-x, confirmou a presença da fase tetragonal nestas ligas e de alumínio metálico na liga CU33Al67 nanoestruturada
Night, Mother Cast List
No full textCast list for 'Night, Mother by Marsha Norman, directed by Don Ehret on May 11 & 13, 1993, and including a note from the play's author
Development and Application of an airborne Differential Absorption Lidar for the Simultaneous Measurement of Ozone and Water Vapor in the Tropopause Region
No full textA new, combined, lidar system has been developed that is able to simultaneously measure profiles of ozone and water vapor onboard of a comparatively small aircraft. The concurrent measurement of these complementary trace species in the upper troposphere and lower stratosphere allows inferring exchange processes in the tropopause region.
Whereas an advanced H2O differential absorption lidar at 935 nm has successfully been developed and extensively tested at DLR in the past, we concentrate here on amending this lidar by addition of a UV channel to measure ozone.
The transmitter of the ozone DIAL is based on a near-IR optical parametric oscillator that is frequency-converted into the UV spectral range by intracavity sum frequency mixing. Hereby, a continuous UV tuning range of ~ 302-316 nm has been achieved. The average output power in this range is higher than 1 W corresponding to more than 10 mJ per pulse at a repetition rate of 100 Hz.
While airborne measurements are still pending, ground-based validation using both ozone sondes and ozone DIAL has successfully been performed and demonstrates the potential of this system
The French-German Climate Monitoring Initiative on global observations of atmospheric CH4
No full textKnowledge of concentrations and fluxes of the most
important long-lived greenhouse carbon dioxide (CO2)
and methane (CH4) is a key element of climate change
research. We report on the status of the French-German
Climate Monitoring Initiative which aims on global
observations of atmospheric methane. This mission
which has recently been selected for joint Phase0/A
studies at CNES and DLR is intended to improve our
understanding of the Global Methane Cycle and the
exploration of the nature of the processes which govern
the exchange of methane between atmosphere and
biosphere. As a novel feature, the observational
instrument of this mission will be an Integrated Path
Differential-Absorption (IPDA) lidar system embarked
on the French spacecraft MYRIADE for the
measurement of the column-weighted dry-air mixing
ratio of CH4. This data will be provided by the lidar
technique with no bias due to particles scattering in the
light path and can directly be used as input for flux
inversion calculation. Other geophysical quantities
which can be derived from the measurements comprise
information on vegetation height, cloud layers, and
surface retro-reflectance
- …
