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  • Meteorology and Climatology  (9)
  • Lasers and Masers  (3)
  • Mice
  • GEOPHYSICS
  • 2000-2004  (13)
  • 1
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    Prevention of organ allograft rejection by a specific Janus kinase 3 inhibitor (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2003-11-01
    Beschreibung: Because of its requirement for signaling by multiple cytokines, Janus kinase 3 (JAK3) is an excellent target for clinical immunosuppression. We report the development of a specific, orally active inhibitor of JAK3, CP-690,550, that significantly prolonged survival in a murine model of heart transplantation and in cynomolgus monkeys receiving kidney transplants. CP-690,550 treatment was not associated with hypertension, hyperlipidemia, or lymphoproliferative disease. On the basis of these preclinical results, we believe JAK3 blockade by CP-690,550 has potential for therapeutically desirable immunosuppression in human organ transplantation and in other clinical settings.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Changelian, Paul S -- Flanagan, Mark E -- Ball, Douglas J -- Kent, Craig R -- Magnuson, Kelly S -- Martin, William H -- Rizzuti, Bonnie J -- Sawyer, Perry S -- Perry, Bret D -- Brissette, William H -- McCurdy, Sandra P -- Kudlacz, Elizabeth M -- Conklyn, Maryrose J -- Elliott, Eileen A -- Koslov, Erika R -- Fisher, Michael B -- Strelevitz, Timothy J -- Yoon, Kwansik -- Whipple, David A -- Sun, Jianmin -- Munchhof, Michael J -- Doty, John L -- Casavant, Jeffrey M -- Blumenkopf, Todd A -- Hines, Michael -- Brown, Matthew F -- Lillie, Brett M -- Subramanyam, Chakrapani -- Shang-Poa, Chang -- Milici, Anthony J -- Beckius, Gretchen E -- Moyer, James D -- Su, Chunyan -- Woodworth, Thasia G -- Gaweco, Anderson S -- Beals, Chan R -- Littman, Bruce H -- Fisher, Douglas A -- Smith, James F -- Zagouras, Panayiotis -- Magna, Holly A -- Saltarelli, Mary J -- Johnson, Kimberly S -- Nelms, Linda F -- Des Etages, Shelley G -- Hayes, Lisa S -- Kawabata, Thomas T -- Finco-Kent, Deborah -- Baker, Deanna L -- Larson, Michael -- Si, Ming-Sing -- Paniagua, Ricardo -- Higgins, John -- Holm, Bari -- Reitz, Bruce -- Zhou, Yong-Jie -- Morris, Randall E -- O'Shea, John J -- Borie, Dominic C -- New York, N.Y. -- Science. 2003 Oct 31;302(5646):875-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Immunology Group, Department of Antibacterials and Immunology, Pfizer Global Researchand Development, Groton, CT 06340, USA. paul_s_changelian@groton.pfizer.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14593182" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Enzyme Inhibitors/administration & dosage/pharmacology/therapeutic use/toxicity ; Gene Expression Regulation/drug effects ; Graft Rejection/*prevention & control ; Graft Survival/drug effects ; *Heart Transplantation ; Humans ; Immunosuppressive Agents/administration & dosage/*pharmacology/therapeutic ; use/toxicity ; Interleukin-2/immunology ; Janus Kinase 3 ; *Kidney Transplantation ; Lymphocyte Activation/drug effects ; Lymphocyte Count ; Lymphocyte Culture Test, Mixed ; Lymphocyte Subsets/drug effects ; Macaca fascicularis ; Mice ; Mice, Inbred C57BL ; Mice, Inbred DBA ; Myocardium/metabolism ; Piperidines ; Protein-Tyrosine Kinases/*antagonists & inhibitors/metabolism ; Pyrimidines/administration & dosage/*pharmacology/therapeutic use/toxicity ; Pyrroles/administration & dosage/*pharmacology/therapeutic use/toxicity ; Transplantation, Heterotopic ; Transplantation, Homologous ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 2
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    The Influence of Soil Moisture, Coastline Curvature, and Land-Breeze Circulations on Sea-Breeze Initiated Precipitation (2000)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-29
    Beschreibung: Idealized numerical simulations are performed with a coupled atmosphere/land-surface model to identify the roles of initial soil moisture, coastline curvature, and land breeze circulations on sea breeze initiated precipitation. Data collected on 27 July 1991 during the Convection and Precipitation Electrification Experiment (CAPE) in central Florida are used. The 3D Goddard Cumulus Ensemble (GCE) cloud resolving model is coupled with the Goddard Parameterization for Land-Atmosphere-Cloud Exchange (PLACE) land surface model, thus providing a tool to simulate more realistically land-surface/atmosphere interaction and convective initiation. Eight simulations are conducted with either straight or curved coast-lines, initially homogeneous soil moisture or initially variable soil moisture, and initially homogeneous horizontal winds or initially variable horizontal winds (land breezes). All model simulations capture the diurnal evolution and general distribution of sea-breeze initiated precipitation over central Florida. The distribution of initial soil moisture influences the timing, intensity and location of subsequent precipitation. Soil moisture acts as a moisture source for the atmosphere, increases the connectively available potential energy, and thus preferentially focuses heavy precipitation over existing wet soil. Strong soil moisture-induced mesoscale circulations are not evident in these simulations. Coastline curvature has a major impact on the timing and location of precipitation. Earlier low-level convergence occurs inland of convex coastlines, and subsequent precipitation occurs earlier in simulations with curved coastlines. The presence of initial land breezes alone has little impact on subsequent precipitation. however, simulations with both coastline curvature and initial land breezes produce significantly larger peak rain rates due to nonlinear interactions.
    Schlagwort(e): Meteorology and Climatology
    Format: application/pdf
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  • 3
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    High Power Laser Diode Arrays for 2-Micron Solid State Coherent Lidars Applications (2003)
    In:  CASI
    Details
    Publikationsdatum: 2018-06-02
    Beschreibung: Laser diode arrays are critical components of any diode-pumped solid state laser systems, constraining their performance and reliability. Laser diode arrays (LDAs) are used as the pump source for energizing the solid state lasing media to generate an intense coherent laser beam with a high spatial and spectral quality. The solid state laser design and the characteristics of its lasing materials define the operating wavelength, pulse duration, and power of the laser diodes. The pump requirements for high pulse energy 2-micron solid state lasers are substantially different from those of more widely used 1-micron lasers and in many aspects more challenging [1]. Furthermore, the reliability and lifetime demanded by many coherent lidar applications, such as global wind profiling from space and long-range clear air turbulence detection from aircraft, are beyond the capability of currently available LDAs. In addition to the need for more reliable LDAs with longer lifetime, further improvement in the operational parameters of high power quasi-cw LDAs, such as electrical efficiency, brightness, and duty cycle, are also necessary for developing cost-effective 2-micron coherent lidar systems for applications that impose stringent size, heat dissipation, and power constraints. Global wind sounding from space is one of such applications, which is the main driver for this work as part of NASA s Laser Risk Reduction Program. This paper discusses the current state of the 792 nm LDA technology and the technology areas being pursued toward improving their performance. The design and development of a unique characterization facility for addressing the specific issues associated with the LDAs for pumping 2-micron coherent lidar transmitters and identifying areas of technological improvement will be described. Finally, the results of measurements to date on various standard laser diode packages, as well as custom-designed packages with potentially longer lifetime, will be reported.
    Schlagwort(e): Lasers and Masers
    Format: application/pdf
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  • 4
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    High-Resolution Mesoscale Simulations of the 6-7 May 2000 Missouri Flash Flood: Impact of Model Initialization and Land Surface Treatment (2004)
    In:  CASI
    Details
    Publikationsdatum: 2018-06-06
    Beschreibung: High-resolution mesoscale model simulations of the 6-7 May 2000 Missouri flash flood event were performed to test the impact of model initialization and land surface treatment on timing, intensity, and location of extreme precipitation. In this flash flood event, a mesoscale convective system (MCS) produced over 340 mm of rain in roughly 9 hours in some locations. Two different types of model initialization were employed: 1) NCEP global reanalysis with 2.5-degree grid spacing and 12-hour temporal resolution, and 2) Eta reanalysis with 40- km grid spacing and $hour temporal resolution. In addition, two different land surface treatments were considered. A simple land scheme. (SLAB) keeps soil moisture fixed at initial values throughout the simulation, while a more sophisticated land model (PLACE) allows for r interactive feedback. Simulations with high-resolution Eta model initialization show considerable improvement in the intensity of precipitation due to the presence in the initialization of a residual mesoscale convective vortex (hlCV) from a previous MCS. Simulations with the PLACE land model show improved location of heavy precipitation. Since soil moisture can vary over time in the PLACE model, surface energy fluxes exhibit strong spatial gradients. These surface energy flux gradients help produce a strong low-level jet (LLJ) in the correct location. The LLJ then interacts with the cold outflow boundary of the MCS to produce new convective cells. The simulation with both high-resolution model initialization and time-varying soil moisture test reproduces the intensity and location of observed rainfall.
    Schlagwort(e): Meteorology and Climatology
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Soil Moisture and Mesoscale Convective Complex Development During the 1993 US Midwest Flood: Results from the MM5-PLACE Atmosphere/Land-Surface Model (2000)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-27
    Beschreibung: The 1993 US Midwest Flood produced record levels of flooding, in the Mississippi River Basin. This flooding resulted from repeated frontal passages and mesoscale convective complexes (MCCs) during the months of June and July. A better understanding of processes that influenced MCC development during the 1993 Flood may lead to improved forecasts of heavy precipitation and flooding. Here, we consider the impact of soil moisture on MCC development during a two-day period (June 23-24) of the 1993 US Midwest Flood. The purpose of this study is to assess the importance of soil moisture distribution on the timing, intensity, and location of heavy precipitation. In this study, the MM5-PLACE Atmosphere/Land-Surface Model is utilized. The atmospheric component consists of the Penn State/NCAR MM5 mesoscale model, and the land-surface component consists of the Goddard Parameterization for Land Atmosphere-Cloud Exchange (PLACE). Initial soil moisture is provided from two sources: 1) NCEP reanalysis, and 2) Antecedent Precipitation Index (API) using NOAA rain gauge measurements as a proxy for soil moisture. NCEP reanalysis provides coarse resolution initial soil moisture (2.5 degree), while API provides high resolution initial soil moisture (10-200 km depending on NOAA rain gauge spacing). Initial results indicate that the distribution of soil moisture has a significant impact on the timing and location of heavy precipitation during this two-day flood event. Precipitation in simulations with high resolution initial soil moisture agrees more closely with observed precipitation. These results suggest that high resolution soil moisture observations are necessary to accurately predict severe storm development, heavy precipitation, and subsequent flooding.
    Schlagwort(e): Meteorology and Climatology
    Materialart: 2001 American Meteorological Society meeting; 14-19 Jan. 2001`; Albuquerque, NM; United States
    Format: text
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  • 6
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    Simulation of the Onset of the Southeast Asian Monsoon during 1997 and 1998: The Impact of Surface Processes (2004)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-18
    Beschreibung: The onset of the southeast Asian monsoon during 1997 and 1998 was simulated with a coupled mesoscale atmospheric model (MM5) and a detailed land surface model. The rainfall results from the simulations were compared with observed satellite data from the TRMM (Tropical Rainfall Measuring Mission) TMI (TRMM Microwave Imager) and GPCP (Global Precipitation Climatology Project). The simulation with the land surface model captured basic signatures of the monsoon onset processes and associated rainfall statistics. The sensitivity tests indicated that land surface processes had a greater impact on the simulated rainfall results than that of a small sea surface temperature change during the onset period. In both the 1997 and 1998 cases, the simulations were significantly improved by including the land surface processes. The results indicated that land surface processes played an important role in modifying the low-level wind field over two major branches of the circulation; the southwest low-level flow over the Indo-China peninsula and the northern cold front intrusion from southern China. The surface sensible and latent heat exchange between the land and atmosphere modified the low-level temperature distribution and gradient, and therefore the low-level. The more realistic forcing of the sensible and latent heat from the detailed land surface model improved the monsoon rainfall and associated wind simulation. The model results will be compared to the simulation of the 6-7 May 2000 Missouri flash flood event. In addition, the impact of model initialization and land surface treatment on timing, intensity, and location of extreme precipitation will be examined.
    Schlagwort(e): Meteorology and Climatology
    Materialart: 7th Workshop on Regional Climate Simulation; Sep 27, 2004 - Sep 29, 2004; Jhong-Li; Taiwan, Province of China
    Format: text
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  • 7
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    Simulation of the Onset of the Southeast Asian Monsoon During 1997 and 1998: The Impact of Surface Processes (2004)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-18
    Beschreibung: The onset of the southeast Asian monsoon during 1997 and 1998 was simulated with a coupled mesoscale atmospheric model (MM5) and a detailed land surface model. The rainfall results from the simulations were compared with observed satellite data from the TRMM (Tropical Rainfall Measuring Mission) TMI (TRMM Microwave Imager) and GPCP (Global Precipitation Climatology Project). The simulation with the land surface model captured basic signatures of the monsoon onset processes and associated rainfall statistics. The sensitivity tests indicated that land surface processes had a greater impact on the simulated rainfall results than that of a small sea surface temperature change during the onset period. In both the 1997 and 1998 cases, the simulations were significantly improved by including the land surface processes. The results indicated that land surface processes played an important role in modifying the low-level wind field over two major branches of the circulation; the southwest low-level flow over the Indo-China peninsula and the northern cold front intrusion from southern China. The surface sensible and latent heat exchange between the land and atmosphere modified the low-level temperature distribution and gradient, and therefore the low-level. The more realistic forcing of the sensible and latent heat from the detailed land surface model improved the monsoon rainfall and associated wind simulation. The model results will be compared to the simulation of the 6-7 May 2000 Missouri flash flood event. In addition, the impact of model initialization and land surface treatment on timing, intensity, and location of extreme precipitation will be examined.
    Schlagwort(e): Meteorology and Climatology
    Materialart: 7th Workshop on Regional Climate Simulation; Oct 04, 2004 - Oct 06, 2004; Cjimg-Li; Taiwan, Province of China
    Format: text
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  • 8
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    Geoscience Laser Altimeter System (GLAS) Instrument: Flight Loop Heat Pipe (LHP) Acceptance Thermal Vacuum Test (2001)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-18
    Beschreibung: Two loop heat pipes (LHPs) are to be used for tight thermal control of the Geoscience Laser Altimeter System (GLAS) instrument, planned for flight in late 2001. The LHPs are charged with Propylene as a working fluid. One LHP will be used to transport 110 W from a laser to a radiator, the other will transport 160 W from electronic boxes to a separate radiator. The application includes a large amount of thermal mass in each LHP system and low initial startup powers. The initial design had some non-ideal flight design compromises, resulted in a less than ideal charge level for this design concept with a symmetrical secondary wick. This less than ideal charge was identified as the source of inadequate performance of the flight LHPs during the flight thermal vacuum test in October of 2000. We modified the compensation chamber design, re-built and charged the LHPs for a final LHP acceptance thermal vacuum test. This test performed March of 2001 was 100% successful. This is the last testing to be performed on the LHPs prior to instrument thermal vacuum test. This sensitivity to charge level was shown through varying the charge on a Development Model Loop Heat Pipe (DM LHP) and evaluating performance at various fill levels. At lower fills similar to the original charge in the flight units, the same poor performance was observed. When the flight units were re-designed and filled to the levels similar to the initial successful DM LHP test, the flight units also successfully fulfilled all requirements. This final flight Acceptance test assessed performance with respect to startup, low power operation, conductance, and control heater power, and steady state control. The results of the testing showed that both LHPs operated within specification. Startup on one of the LHPs was better than the other LHP because of the starter heater placement and a difference in evaporator design. These differences resulted in a variation in the achieved superheat prior to startup. The LHP with the lower superheat was sensitive to the thermal environment around the compensation chamber, while the LHP with the higher superheat (similar in design to DM LHP) was not. In response to the test results the placement of the starter heater will be optimized for the flight instrument testing for higher achieved superheat. This presentation discusses startup behavior, overall conductance of a radiator system, low power operation, high power operation, temperature control stability, and control heater power requirements as measured during this acceptance thermal vacuum test. A brief summary of 'lessons learned' will be included.
    Schlagwort(e): Lasers and Masers
    Materialart: International Two-Phase Thermal Control Technology Workshop; Jun 07, 2001 - Jun 08, 2001; Los Angeles, CA; United States
    Format: text
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  • 9
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    A study of heavy precipitation events in Taiwan during 10-13 August, 1994: mesoscale model simulations (2001)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-17
    Beschreibung: Heavy rainfall occurred over the western side of Taiwan's complex terrain from August 10 to 13, 1994 after Typhoon Doug moved northward from the East China Sea into Taiwan and on towards the Yellow Sea. On August 10, most of the rainfall fell over sloped areas. The heaviest daily rainfall totals were in excess of 200 mm over southwestern as well as central Taiwan. However, not much rainfall occurred over northern Taiwan. The lack of rainfall over northern Taiwan also occurred on August 11, 12 and 13. The larger rainfall amounts shifted westward from the sloped areas on August 10 toward lower terrain on August 11. On August 12 and 13, most of the higher rainfall amounts were found over the coastal area in southwestern Taiwan. Notably, about 300 to 400 mm per day fell over the coastal area in southwest Taiwan on August 12 and 13. The distribution of rainfall amount was different on August 10 and 11 (termed as Case 1) compared to August 12 and 13 (termed as Case 2). The environmental situation and precipitation characteristics are analyzed using EC/TOGA data, ground-based radar data, surface rainfall patterns, surface wind data, and upper air soundings. Chen at al. (2001) also categorized the precipitation pattern into two types, propagating and quasi-stationary. For the propagating type of precipitation, rainrates increased or remained the same as systems went from the plains to mountainous regions. With the quasi-stationary type of precipitation, however, rainrates decreased as precipitation propagated across the plains and into the mountains. The focus of this study is to understand what causes the h1aher amounts of rainfall over Taiwan, and what factors influence where the higher amounts of rainfall will occur, over sloped areas or over coastal areas.
    Schlagwort(e): Meteorology and Climatology
    Materialart: MP-12 , MM5 Users Workshop; Jun 25, 2001 - Jun 27, 2001; Boulder, CO; United States
    Format: application/pdf
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  • 10
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    A Study of Heavy Precipitation Events in Taiwan During 10-13 August, 1994 (2001)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-16
    Beschreibung: Several heavy precipitation episodes occurred over Taiwan from August 10 to 13, 1994. Precipitation patterns and characteristics are quite different between the precipitation events that occurred from August 10 and I I and from August 12 and 13. In Part I (Chen et al. 2001), the environmental situation and precipitation characteristics are analyzed using the EC/TOGA data, ground-based radar data, surface rainfall patterns, surface wind data, and upper air soundings. In this study (Part II), the Penn State/NCAR Mesoscale Model (MM5) is used to study the precipitation characteristics of these heavy precipitation events. Various physical processes (schemes) developed at NASA Goddard Space Flight Center (i.e., cloud microphysics scheme, radiative transfer model, and land-soil-vegetation surface model) have recently implemented into the MM5. These physical packages are described in the paper, Two way interactive nested grids are used with horizontal resolutions of 45, 15 and 5 km. The model results indicated that Cloud physics, land surface and radiation processes generally do not change the location (horizontal distribution) of heavy precipitation. The Goddard 3-class ice scheme produced more rainfall than the 2-class scheme. The Goddard multi-broad-band radiative transfer model reduced precipitation compared to a one-broad band (emissivity) radiation model. The Goddard land-soil-vegetation surface model also reduce the rainfall compared to a simple surface model in which the surface temperature is computed from a Surface energy budget following the "force-re store" method. However, model runs including all Goddard physical processes enhanced precipitation significantly for both cases. The results from these runs are in better agreement with observations. Despite improved simulations using different physical schemes, there are still some deficiencies in the model simulations. Some potential problems are discussed. Sensitivity tests (removing either terrain or radiative processes) are performed to identify the physical processes that determine the precipitation patterns and characteristics for heavy rainfall events. These sensitivity tests indicated that terrain can play a major role in determining the exact location for both precipitation events. The terrain can also play a major role in determining the intensity of precipitation for both events. However, it has a large impact on one event but a smaller one on the other. The radiative processes are also important for determining, the precipitation patterns for one case but. not the other. The radiative processes can also effect the total rainfall for both cases to different extents.
    Schlagwort(e): Meteorology and Climatology
    Materialart: Journal of the Meteorological Society of Japan; 1-37
    Format: application/pdf
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