17,710 research outputs found
Recent Trends in Hospitalization for Acute Myocardial Infarction in Beijing: Increasing Overall Burden and a Transition From ST-Segment Elevation to Non-ST-Segment Elevation Myocardial Infarction in a Population-Based Study
Comparable data on trends of hospitalization rates for ST-segment elevation myocardial infarction (STEMI) and non-STEMI (NSTEMI) remain unavailable in representative Asian populations.To examine the temporal trends of hospitalization for acute myocardial infarction (AMI) and its subtypes in Beijing.Patients hospitalized for AMI in Beijing from January 1, 2007 to December 31, 2012 were identified from the validated Hospital Discharge Information System. Trends in hospitalization rates, in-hospital mortality, length of stay (LOS), and hospitalization costs were analyzed by regression models for total AMI and for STEMI and NSTEMI separately. In total, 77,943 patients were admitted for AMI in Beijing during the 6 years, among whom 67.5% were males and 62.4% had STEMI. During the period, the rate of AMI hospitalization per 100,000 population increased by 31.2% (from 55.8 to 73.3 per 100,000 population) after age standardization, with a slight decrease in STEMI but a 3-fold increase in NSTEMI. The ratio of STEMI to NSTEMI decreased dramatically from 6.5:1.0 to 1.3:1.0. The age-standardized in-hospital mortality decreased from 11.2% to 8.6%, with a significant decreasing trend evident for STEMI in males and females (P < 0.001) and for NSTEMI in males (P = 0.02). The rate of percutaneous coronary intervention increased from 28.7% to 55.6% among STEMI patients. The total cost for AMI hospitalization increased by 56.8% after adjusting for inflation, although the LOS decreased by 1 day.The hospitalization burden for AMI has been increasing in Beijing with a transition from STEMI to NSTEMI. Diverse temporal trends in AMI subtypes from the unselected "real-world" data in Beijing may help to guide the management of AMI in China and other developing countries
Generation of spatially-separated spin entanglement in a triple quantum dot system
We propose a novel method for the creation of spatially-separated spin
entanglement by means of adiabatic passage of an external gate voltage in a
triple quantum dot system.Comment: 10 pages, 6 figure
A novel mechanism of charge density wave in a transition metal dichalcogenide
Charge density wave, or CDW, is usually associated with Fermi surfaces
nesting. We here report a new CDW mechanism discovered in a 2H-structured
transition metal dichalcogenide, where the two essential ingredients of CDW are
realized in very anomalous ways due to the strong-coupling nature of the
electronic structure. Namely, the CDW gap is only partially open, and charge
density wavevector match is fulfilled through participation of states of the
large Fermi patch, while the straight FS sections have secondary or negligible
contributions.Comment: 5 pages and 4 figure
Evolution of the Electronic Structure of 1T-CuxTiSe2
The electronic structure of a new charge-density-wave/ superconductor system,
1T-CuxTiSe2, has been studied by photoemission spectroscopy. A correlated
semiconductor band structure is revealed for the undoped case. With Cu doping,
the charge density wave is suppressed by the raising of the chemical potential,
while the superconductivity is enhanced by the enhancement of the density of
states. Moreover, the strong scattering at high doping might be responsible for
the suppression of superconductivity in that regime.Comment: 5 pages, 4 figure
Renormalization of tensor-network states
We have discussed the tensor-network representation of classical statistical
or interacting quantum lattice models, and given a comprehensive introduction
to the numerical methods we recently proposed for studying the tensor-network
states/models in two dimensions. A second renormalization scheme is introduced
to take into account the environment contribution in the calculation of the
partition function of classical tensor network models or the expectation values
of quantum tensor network states. It improves significantly the accuracy of the
coarse grained tensor renormalization group method. In the study of the quantum
tensor-network states, we point out that the renormalization effect of the
environment can be efficiently and accurately described by the bond vector.
This, combined with the imaginary time evolution of the wavefunction, provides
an accurate projection method to determine the tensor-network wavfunction. It
reduces significantly the truncation error and enable a tensor-network state
with a large bond dimension, which is difficult to be accessed by other
methods, to be accurately determined.Comment: 18 pages 23 figures, minor changes, references adde
Primary role of the barely occupied states in the charge density wave formation of NbSe2
NbSe2 is a prototypical charge-density-wave (CDW) material, whose mechanism
remains mysterious so far. With angle resolved photoemission spectroscopy, we
mapped out the CDW gap and recovered the long-lost nesting condition over a
large broken-honeycomb region in the Brillouin zone, which consists of six
saddle band point regions with high density of states (DOS), and large regions
away from Fermi surface with negligible DOS at the Fermi energy. We show that
the major contributions to the CDW come from these barely occupied states
rather than the saddle band points. Our findings not only resolve a long
standing puzzle, but also overthrow the conventional wisdom that CDW is
dominated by regions with high DOS.Comment: 5 pages, 4 figure
Genome-wide examination of chlorophyll metabolic genes in maize and phylogenetic analysis among different photosynthetic organisms
Chlorophyll (Chl) is the key pigment involved in photosynthesis. Analysis of the expression pattern of Chl metabolic genes will contribute to our understanding of photosynthesis. Also, the genes coding for Chl metabolism are ideal targets for revealing the evolution relationships of photosynthetic organisms. In this study, we summarized the Chl metabolic pathway in higher plants and conducted in silico expression analysis of related genes in maize. Phylogenetic analysis revealed that the evolution of Chl metabolic genes proceeded in a certain direction. Moreover, the diversity of some rate-limiting enzymes might have played a positive role in the evolution of Chl metabolism.Kew words: Chlorophyll, maize, metabolism, phylogeny, photosynthesis
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