89 research outputs found
IMECE2005-79596 EXPERIMENTAL AND COMPUTATIONAL COMPARISONS OF FAN-SHAPED FILM- COOLING ON A TURBINE VANE SURFACE
ABSTRACT The flow exiting the combustor in a gas turbine engine is considerably hotter than the melting temperature of the turbine section components, of which the turbine nozzle guide vanes see the hottest gas temperatures. One method used to cool the vanes is to use rows of film-cooling holes to inject bleed air that is lower in temperature through an array of discrete holes onto the vane surface. The purpose of this study was to evaluate the row-by-row interaction of fan-shaped holes as compared to the performance of a single row of fan-shaped holes in the same locations. This study presents adiabatic film-cooling effectiveness measurements from a scaled-up, two-passage vane cascade. High resolution film-cooling measurements were made with an infrared (IR) camera at a number of engine representative flow conditions. Computational fluid dynamics (CFD) predictions were also made to evaluate the performance of some of the current turbulence models in predicting a complex flow such as turbine film-cooling. The RNG k-Δ turbulence model gave a closer prediction of the overall level of film-effectiveness, while the v 2 -f turbulence model gave a more accurate representation of the flow physics seen in the experiments
Interplay between thyroid cancer cells and macrophages: effects on IL-32 mediated cell death and thyroid cancer cell migration
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Weak ferromagnetism of quasi-one-dimensional S=1/2 antiferromagnet BaCuGeO
Weak ferromagnetism of quasi-one-dimensional S = 1/2 antiferromagnet
BaCuGeO is studied by the magnetization measurement. The
spontaneous magnetization appears along the b axis. The local symmetry between
the in-chain nearest neighbor spins allows the presence of
Dzyaloshinskii-Moriya interaction, and the only possible spatial configuration
of the weak ferromagnetic moment per spin determines the sign of the
inter-chain interaction. A weak -axis magnetic field can change the
direction of the magnetization to the -axis direction, which shows that the
spin chain forms a weakly coupled weak-ferromagnetic chain system.Comment: 10 pages, 4 figure
Sensitivity to cyclosporin A is mediated by cyclophilin in Neurospora crassa and Saccharomyces cerevisiae
Aberrant chromatin landscape following loss of the H3.3 chaperone Daxx in haematopoietic precursors leads to Pu.1-mediated neutrophilia and inflammation
Defective silencing of retrotransposable elements has been linked to inflammageing, cancer and autoimmune diseases. However, the underlying mechanisms are only partially understood. Here we implicate the histone H3.3 chaperone Daxx, a retrotransposable element repressor inactivated in myeloid leukaemia and other neoplasms, in protection from inflammatory disease. Loss of Daxx alters the chromatin landscape, H3.3 distribution and histone marks of haematopoietic progenitors, leading to engagement of a Pu.1-dependent transcriptional programme for myelopoiesis at the expense of B-cell differentiation. This causes neutrophilia and inflammation, predisposing mice to develop an autoinflammatory skin disease. While these molecular and phenotypic perturbations are in part reverted in animals lacking both Pu.1 and Daxx, haematopoietic progenitors in these mice show unique chromatin and transcriptome alterations, suggesting an interaction between these two pathways. Overall, our findings implicate retrotransposable element silencing in haematopoiesis and suggest a cross-talk between the H3.3 loading machinery and the pioneer transcription factor Pu.1
Chiral Heterocyclic Ligands. XI. Self-assembly and X-Ray Crystal Structures of Chiral Silver Coordination Polymers of (S)-(-)-Nicotine
Three chiral coordination polymers have been prepared by reaction of (S)-(-)-nicotine with silver(I) salts. X-Ray crystal structure determinations revealed that these all contain polymer chains in which the nicotine molecule acts as a bridging ligand between four-coordinate silver atoms. In one
case additional bridging by nitrate anions leads to a three-dimensional network structure
Qualidade quĂmica de frutos do maracujazeiro-amarelo em solo com biofertilizante irrigado com ĂĄguas salinas
Integriertes 3-D-Naehsystem Schlussbericht
Available from TIB Hannover: F98B71+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman
Low frequency noise statistical characterization of 14nm FDSOI technology node
session 10: Advanced characterization techniquesInternational audienceIn this paper, we performed a statistical analysis of the low-frequency noise (LFN) in 14nm FDSOI n-MOS devices. Front and back gate interfaces were characterized, revealing an equal contribution to the total noise level. Finally, the LFN variability is analyzed and a comparison to previous CMOS technologies is presented
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