3,661 research outputs found
Design and Evaluation of Digital Baseband Converter Sub-channel Delay Compensation Method on Bandwidth Synthesis
The effect of sub-channel delay on bandwidth synthesis is investigated to eliminate the “phase step” phenomenon in bandwidth synthesis during the test of CDBE (Chinese Digital Backend). Through formula derivation, we realize that sub-channel delay may cause phase discontinuity between different sub-channels. Theoretical analysis shows that sub-channel delay can induce bandwidth synthesis error in group delay measurement of the linear system. Furthermore, in the differential delay measurement between two stations, bandwidth synthesis error may occur when the LO (Local Oscillator) frequency differences of corresponding sub-channels are not identical. Error-free conditions are discussed under different applications. The phase errors among different sub-channels can be removed manually. However, the most effective way is the compensation of sub-channel delay. A sub-channel delay calculation method based on Modelsim is proposed. The compensation method is detailed. Simulation and field experiments are presented to verify our approach
Bayesian inference of momentum and length dependence of jet energy loss
Using a simple model for medium modification of the jet function through a
parameterized form of the jet energy loss distribution, we carry out a
comprehensive Bayesian analysis of the world data on single inclusive jet
spectra in heavy-ion collisions at both RHIC and LHC energies. We extract the
average jet energy loss as a function of jet
transverse momentum for each collision system and centrality
independently. Assuming jet energy loss is proportional to the initial parton
density as estimated from the
pseudorapidity density of charged hadron multiplicity and
the effective system size given by the
number of participant nucleons , the scaled average jet energy
loss
for jet cone-size is found to have a momentum dependence that is
slightly stronger than a logarithmic form while the system size or length
dependence is slower than a linear one. The fluctuation of jet energy loss is,
however, independent of the initial parton density or the system size. These
are consistent with results from Monte Carlo simulations of jet transport in a
fast expanding quark-gluon plasma in high-energy heavy-ion collisions.Comment: 9 pages with 10 figure
Adiponectin improves coronary no-reflow injury by protecting the endothelium in rats with type 2 diabetes mellitus.
To determine the effect of adiponectin (APN) on the coronary no-reflow (NR) injury in rats with Type 2 diabetes mellitus (T2DM), 80 male Sprague-Dawley rats were fed with a high-sugar-high-fat diet to build a T2DM model. Rats received vehicle or APN in the last week and then were subjected to myocardial ischemia reperfusion (MI/R) injury. Endothelium-dependent vasorelaxation of the thoracic aorta was significantly decreased and serum levels of endothelin-1 (ET-1), intercellular cell adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) were noticably increased in T2DM rats compared with rats without T2DM. Serum APN was positively correlated with the endothelium-dependent vasorelaxation, but negatively correlated with the serum level of ET-1. Treatment with APN improved T2DM-induced endothelium-dependent vasorelaxation, recovered cardiac function, and decreased both NR size and the levels of ET-1, ICAM-1 and VCAM-1. Hypoadiponectinemia was associated with the aggravation of coronary NR in T2DM rats. APN could alleviate coronary NR injury in T2DM rats by protecting the endothelium and improving microcirculation
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