21,918 research outputs found
Equipment constraints on Apollo Lunar Surface Experiments Package deployment sequence
No full textThe major equipment constraints on the ALSEP deployment sequence are defined and basic background material for the constraints is presented.prepared by O. T. Neau
Preliminary design considerations for direct radiative thermal (DRT) control
No full textThis memorandum summarizes some of the trade-off considerations necessary in the design of a direct radiator for the ALSEP central station, utilizing second surface mirrors. Recommendations for a baseline design are derived.prepared by O. T. Neau
Operational contingency evaluation
No full textThis ATM documents Task 1 of the Operational Contingency Study defined in ATM-396. Major functional failure modes for the ALSEP Central Station and for each experiment (both Array A and Array B) have been tabulated. The format includes an estimate of the gross operational effect of each listed contingency. The referenced notes justify the assignment of each contingency to its respective degradation category and indicate the mode of recovery, where one exists.prepared by O. T. Neau
Block 3 operations plan
No full textThe Block 3 Operations Plan was originally scheduled for publication on 20 October 1966. However, as no significant changes have occurred since the publication of the Block 2 Operations Plan, ATR-18 dated 12 September 1966, the latter document is still effective and serves the requirement of Block 3 as well. Accordingly no separate Block 3 Operations Plan will be issued.prepared by O. Neau
Central Station power switching characteristics
No full textThis ATM summarizes the conditions which led to the ALSEP Central Station Discrepancy Report AA 7344 and analyzes the results of trouble shooting steps performed to isolate and define the anomaly. Recommendations are made regarding proper operational procedures.prepared by D. Douthat, O. Neau, W. Tosh
Apollo Lunar Surface Experiments Package power budget
No full textThis issue of the ALSEP power budget provides the information available at the end of November 1970 on the power requirements of the major ALSEP components and the resulting composite system power usage for the deliverable systems. The data reflect measurements made during testing of qualification and flight equipment.prepared by O. T. Neau.Revision
Command list
No full textThis command list, applicable to Flight Models 1, 3 and 4 of ALSEP, supersedes previous editions. Flight Model #2 has been allocated for use in the EASEP program, commands for which are defined in EATM-4 (Rev. A) dated 1 February 1969.prepared by O. T. Neau.Revision no.
Heterogeneous and tissue-specific regulation of effector T cell responses by IFN-gamma during Plasmodium berghei ANKA infection.
No full textIFN-γ and T cells are both required for the development of experimental cerebral malaria during Plasmodium berghei ANKA infection. Surprisingly, however, the role of IFN-γ in shaping the effector CD4(+) and CD8(+) T cell response during this infection has not been examined in detail. To address this, we have compared the effector T cell responses in wild-type and IFN-γ(-/-) mice during P. berghei ANKA infection. The expansion of splenic CD4(+) and CD8(+) T cells during P. berghei ANKA infection was unaffected by the absence of IFN-γ, but the contraction phase of the T cell response was significantly attenuated. Splenic T cell activation and effector function were essentially normal in IFN-γ(-/-) mice; however, the migration to, and accumulation of, effector CD4(+) and CD8(+) T cells in the lung, liver, and brain was altered in IFN-γ(-/-) mice. Interestingly, activation and accumulation of T cells in various nonlymphoid organs was differently affected by lack of IFN-γ, suggesting that IFN-γ influences T cell effector function to varying levels in different anatomical locations. Importantly, control of splenic T cell numbers during P. berghei ANKA infection depended on active IFN-γ-dependent environmental signals--leading to T cell apoptosis--rather than upon intrinsic alterations in T cell programming. To our knowledge, this is the first study to fully investigate the role of IFN-γ in modulating T cell function during P. berghei ANKA infection and reveals that IFN-γ is required for efficient contraction of the pool of activated T cells
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
NEPTUNE_CFD High Parallel Computing Performances for Particle-Laden Reactive Flows
No full textThis paper presents high performance computing of NEPTUNE_CFD V1.07@Tlse. NEPTUNE_CFD is an unstructured
parallelized code (MPI) using unsteady Eulerian multi-fluid approach for dilute and dense particle-laden reactive
flows. Three-dimensional numerical simulations of two test cases have been carried out. The first one, a uniform
granular shear flow exhibits an excellent scalability of NEPTUNE_CFD up to 1024 cores, and demonstrates the
good agreement between the parallel simulation results and the analytical solutions. Strong scaling and weak scaling
benchmarks have been performed. The second test case, a realistic dense fluidized bed shows the code computing
performances on an industrial geometry
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