721 research outputs found
(E)-N′-(3,4-Dichlorobenzylidene)nicotinohydrazide monohydrate
In the title compound, C13H9Cl2N3O·H2O, the 3,4-dichlorobenzene ring is nearly coplanar with the pyridine ring, making a dihedral angle of 4.78 (8)°. Intermolecular O—H⋯O, O—H⋯N, N—H⋯O and weak C—H⋯O hydrogen bonding is present in the crystal structure
Experimental realization of three-color entanglement at optical fiber communication and atomic storage wavelengths
Multi-color entangled states of light including low-loss optical fiber
transmission and atomic resonance frequencies are essential resources for
future quantum information network. We present the experimental achievement on
the three-color entanglement generation at 852 nm, 1550 nm and 1440 nm
wavelengths for optical continuous variables. The entanglement generation
system consists of two cascaded non-degenerated optical parametric oscillators
(NOPOs). The flexible selectivity of nonlinear crystals in the two NOPOs and
the tunable property of NOPO provide large freedom for the frequency selection
of three entangled optical beams, so the present system is possible to be
developed as practical devices used for quantum information networks with
atomic storage units and long fiber transmission lines.Comment: 4pages, 4 figure
Bacterial etiology in early re-admission patients with acute exacerbation of chronic obstructive pulmonary disease
Background: Repeatedly hospitalized patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD) are often exposed to more antibiotics, but the distribution of pathogenic bacteria in these patients is poorly understood. The objectives of this study were to analyze the distribution of pathogenic bacteria and the risk factors associated with multidrug-resistant (MDR) bacteria infection in early re-admission patients with AECOPD.Methods: We retrospectively reviewed charts for patients with AECOPD admitted to our hospital between January 2011 and november 2012. The early re-admission group and non-early readmission group were determined by whether patients were readmitted within 31 days after discharge. Detection of potentially pathogenic microorganisms (PPMs) and MDR bacteria were analyzed. Logistic regression analysis was performed to identify independent risk factors for MDR bacteria infection.Results: PPMs were isolated from 230 (32.0%) cases of respiratory tract specimens; MDR bacteria accounted for 24.7% (57/230). Pseudomonas aeruginosa (43.7%), Klebsiella pneumoniae (15.6%), and Acinetobacter baumannii (12.5%) were the top three PPMs in the early readmission group, while the top three PPMs in the non-early readmission group were K. pneumoniae (23.7%), P. aeruginosa (21.2%), and Streptococcus pneumoniae (17.1%). Multivariate analysis showed that use of antibiotics within 2 weeks (odds ratio [OR] 8.259, 95% confidence interval [CI] 3.056-22.322, p = 0.000) was the independent risk factor for MDR bacteria infection.Conclusion: Non-fermentative Gram-negative bacilli (NFGNB) and enterobacteria were the predominant bacteria in early readmission patients with AECOPD. The detection rate of MDR bacteria was high which was related to the use of antibiotics within 2 weeks before admission in these patients.Keywords: AECOPD, re-admission, bacteria, multidrug-resistant (MDR), risk factors
(E)-N′-(1,3-Benzodioxol-5-ylmethylene)nicotinohydrazide monohydrate
In the title compound, C14H11N3O3·H2O, the planar [maximum deviation 0.135 (1) Å] 1,3-benzodioxole ring system is oriented at a dihedral angle of 13.93 (7)° with respect to the pyridine ring. Extensive intermolecular N—H⋯O, O—H⋯O, O—H⋯N and weak C—H⋯O hydrogen bonding is present in the crystal structure
Quantum Alternating Operator Ansatz for Solving the Minimum Exact Cover Problem
The minimum exact cover (MEC) is a common combinatorial optimization problem,
with wide applications in tail-assignment and vehicle routing. In this paper,
we adopt quantum alternating operator ansatz (QAOA+) to solve MEC problem. In
detail, to obtain a trivial feasible solution, we first transform MEC into a
constrained optimization problem with two objective functions. Then, we adopt
the linear weighted sum method to solve the above constrained optimization
problem and construct the corresponding target Hamiltonian. Finally, to improve
the performance of this algorithm, we adopt parameters fixing strategy to
simulate, where the experimental instances are 6, 8, and 10 qubits. The
numerical results show that the solution can be obtained with high probability
when level of the algorithm is low. Besides, we optimize the quantum
circuit by removing single-qubit rotating gates . We found that the number
of quantum gates is reduced by for -level optimized circuit.
Furthermore, -level optimized circuit only needs parameters, which can
achieve an experimental effect similar to original circuit with
parameters
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