107 research outputs found
Analyzing Planar Galactic Halo Distributions with Fuzzy/Cold Dark Matter Models
We numerically make a comparison between the fuzzy dark matter model and the
cold dark matter model, focusing on formations of satellite galaxy planes
around massive galaxies. We demonstrate that satellite galaxies in the fuzzy
dark matter side have a tendency to form more flattened and corotating
satellite systems than in the cold dark matter side due to the dissipation by
the gravitational cooling effect of the fuzzy dark matter. We also show that,
even with the same set of initial conditions, the number of satellites
surviving becomes smaller in the fuzzy dark matter model than the cold dark
matter counterpart
Simulations of Nonthermal Electron Transport in Multidimensional Flows: Synthetic Observations of Radio Galaxies
We have applied an effective numerical scheme for cosmic-ray transport to 3D
MHD simulations of jet flow in radio galaxies (see the companion paper by Jones
et al. 1999). The marriage of relativistic particle and 3D magnetic field
information allows us to construct a rich set of ``synthetic observations'' of
our simulated objects. The information is sufficient to calculate the ``true''
synchrotron emissivity at a given frequency using explicit information about
the relativistic electrons. This enables us to produce synchrotron
surface-brightness maps, including polarization. Inverse-Compton X-ray
surface-brightness maps may also be produced. First results intended to explore
the connection between jet dynamics and electron transport in radio lobes are
discussed. We infer lobe magnetic field values by comparison of synthetically
observed X-ray and synchrotron fluxes, and find these ``inverse-Compton''
fields to be quite consistent with the actual RMS field averaged over the lobe.
The simplest minimum energy calculation from the synthetic observations also
seems to agree with the actual simulated source properties.Comment: 7 pages, 1 figure; to appear in Life Cycles of Radio Galaxies, ed. J.
Biretta et al., New Astronomy Review
Stress Hematopoiesis Is Regulated by the KrĂŒppelâLike Transcription Factor ZBPâ89
Previous studies have shown that ZBPâ89 (Zfp148) plays a critical role in erythroid lineage development, with its loss at the embryonic stage causing lethal anemia and thrombocytopenia. Its role in adult hematopoiesis has not been described. We now show that conditional deletion of ZBPâ89 in adult mouse hematopoietic stem/progenitor cells (HSPC) causes anemia and thrombocytopenia that are transient in the steady state, but readily uncovered following chemically induced erythro/megakaryopoietic stress. Unexpectedly, stress induced by bone marrow transplantation of ZBP89 â / â HSPC also resulted in a myeloidâtoâB lymphoid lineage switch in bone marrow recipients. The erythroid and myeloid/B lymphoid lineage anomalies in ZBP89 â / â HSPC are reproduced in vitro in the ZBPâ89 âsilenced multipotent hematopoietic cell line FDCPâMix A4, and are associated with the upregulation of PU.1 and downregulation of SCL/Tal1 and GATAâ1 in ZBP89âdeficient cells. Chromatin immunoprecipitation and luciferase reporter assays show that ZBPâ89 is a direct repressor of PU.1 and activator of SCL/Tal1 and GATAâ1 . These data identify an important role for ZBPâ89 in regulating stress hematopoiesis in adult mouse bone marrow. S tem C ells 2014;32:791â801Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106141/1/stem1598.pd
Compact Asymmetrical Quasi-MMIC Doherty Power Amplifier
This paper presents a compact asymmetrical Doherty power amplifier (PA) based on a quasi-MMIC configuration for 5G sub-6 GHz applications. The proposed Doherty PA is composed of commercial GaN HEMTs and several passive components implemented on a silicon (Si) substrate. In order to achieve size and cost advantages, passive components such as a power divider, input matching networks, output matching networks, and a Doherty combiner are realized using Si-integrated passive device (Si-IPD) technology, which costs about 40% of the budget for the entire GaN MMIC process. For the 3.5 GHz pulsed-continuous waveform signal, the fabricated Doherty PA has an efficiency of 52.6% at a saturated output power of 44.2 dBm. Furthermore, an efficiency of 45.6% was achieved with the output power back-off (OBO) of 7.0 dB. The implemented PA occupies only 8.9 mm Ă 5.6 mm
Prognostic Role of TMED3 in Clear Cell Renal Cell Carcinoma: A Retrospective Multi-Cohort Analysis
Transmembrane p24 trafficking protein 3 (TMED3) is a metastatic suppressor in colon cancer and hepatocellular carcinoma. However, its function in the progression of clear cell renal cell carcinoma (ccRCC) is unknown. Here, we report that TMED3 could be a new prognostic marker for ccRCC. Patient data were extracted from cohorts in the Cancer Genome Atlas (TCGA) and the International Cancer Genome Consortium (ICGC). Differential expression of TMED3 was observed between the low stage (Stage I and II) and high stage (Stage III and IV) patients in the TCGA and ICGC cohorts and between the low grade (Grade I and II) and high grade (Grade III and IV) patients in the TCGA cohort. Further, we evaluated TMED3 expression as a prognostic gene using Kaplan-Meier survival analysis, multivariate analysis, the time-dependent area under the curve (AUC) of Unoâs C-index, and the AUC of the receiver operating characteristics at 5 years. The Kaplan-Meier analysis revealed that TMED3 overexpression was associated with poor prognosis for ccRCC patients. Analysis of the C-indices and area under the receiver operating characteristic curve further supported this. Multivariate analysis confirmed the prognostic significance of TMED3 expression levels (P = 0.005 and 0.006 for TCGA and ICGC, respectively). Taken together, these findings demonstrate that TMED3 is a potential prognostic factor for ccRCC
Wind Power Density(íë „ë°ë)
Abstract The wind speed at the altitude around 300 m is much higher and less variable than at the altitude around 80 m which is the same height of the MW class tower turbine's hub height. The wind power density is increased 0.37 W/m 2 per meter at the altitude around 6 to 7 km and 0.25 W/m 2 per meter at the altitude around 80 to 500 m. There are two types of power generation systems using lifting bodies. The one is that The generator is installed in the ground station and stretched into the lifting body through the tether. The other is that the generator is installed in the lifting body and stretched into the ground station through the tether. Many kinds of lifting bodies are also researched in the world, called kites, wings, single or twin aerostat, and so on. This article introduced the technical development status and the market prospects of the high altitude wind power generation system all over the world in detail. Key word
Schroedinger Self-adjoint Extension and Quantum Field Theory
We argue that the results obtained using the quantum mechanical method of
self-adjoint extension of the Schr\"odinger Hamiltonian can also be derived
using Feynman perturbation theory in the investigation of the corresponding
non-relativistic field theories. We show that this is indeed what happens in
the study of an anyon system, and, in doing so, we establish a field
theoretical description for ``colliding anyons", {\it i.e.} anyons whose
quantum mechanical wave functions satisfy the non-conventional boundary
conditions obtained with the method of self-adjoint extension. We also show
that analogous results hold for a system of non-abelian Chern-Simons particles.Comment: 9 pages, Plain LaTex, MIT-CTP-232
Exact 4-point Scattering Amplitude of the Superconformal Schrodinger Chern-Simons Theory
We consider the non-relativistic superconformal U(N) X U(N) Chern-Simons
theory with level (k,-k) possessing fourteen supersymmetries. We obtain an
exact four-point scattering amplitude of the theory to all orders in 1/N and
1/k and prove that the scattering amplitude becomes trivial when k=1 and 2. We
confirm this amplitude to one-loop order by using an explicit field theoretic
computation and show that the beta function for the contact interaction
vanishes to the one-loop order, which is consistent with the quantum conformal
invariance of the underlying theory.Comment: 16 page
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