3,823 research outputs found
Modified holographic dark energy in DGP brane world
In this paper, the cosmological dynamics of a modified holographic dark
energy which is derived from the UV/IR duality by considering the black hole
mass in higher dimensions as UV cutoff, is investigated in
Dvali-Gabadaze-Porrati (DGP) brane world model. We choose Hubble horizon and
future event horizon as IR cutoff respectively. And the two branches of the DGP
model are both taken into account. When Hubble horizon is considered as IR
cutoff, the modified holographic dark energy (HDE) behaves like an effect dark
energy that modification of gravity in pure DGP brane world model acts and it
can drive the expansion of the universe speed up at late time in
branch which in pure DGP model can not undergo an accelerating phase. When
future event horizon acts as IR cutoff, the equation of state parameter of the
modified HDE can cross the phantom divide.Comment: 8 pages, 4 figures, accepted for publication in PL
Optimizing production scheduling of steel plate hot rolling for economic load dispatch under time-of-use electricity pricing
Time-of-Use (TOU) electricity pricing provides an opportunity for industrial
users to cut electricity costs. Although many methods for Economic Load
Dispatch (ELD) under TOU pricing in continuous industrial processing have been
proposed, there are still difficulties in batch-type processing since power
load units are not directly adjustable and nonlinearly depend on production
planning and scheduling. In this paper, for hot rolling, a typical batch-type
and energy intensive process in steel industry, a production scheduling
optimization model for ELD is proposed under TOU pricing, in which the
objective is to minimize electricity costs while considering penalties caused
by jumps between adjacent slabs. A NSGA-II based multi-objective production
scheduling algorithm is developed to obtain Pareto-optimal solutions, and then
TOPSIS based multi-criteria decision-making is performed to recommend an
optimal solution to facilitate filed operation. Experimental results and
analyses show that the proposed method cuts electricity costs in production,
especially in case of allowance for penalty score increase in a certain range.
Further analyses show that the proposed method has effect on peak load
regulation of power grid.Comment: 13 pages, 6 figures, 4 table
Bis[(2-chloro-4-fluorobenzyl)triphenylphosphonium] bis(1,2,5-thiadiazole-3,4-dithiolato)nickelate(II)
The title ion-pair complex, (C25H20ClFP)2[Ni(C2N2S3)2], was obtained by the direct reaction of (4-F,2-ClBzTPP)+·Br− [4-F,2-ClBzTPP+ is (2-chloro-4-fluorobenzyl)triphenylphosphonium], NiCl2·6H2O and Na2tdas (tdas2− is 1,2,5-thiadiazole-3,4-dithiolate) in methanol. The asymmetric unit of the title structure comprises one (4-F,2-ClBzTPP)+ cation and half of an [Ni(tdas)2]2− complex anion, with the NiII ion situated on a center of symmetry, leading to a slightly distorted square-planar coordination of the latter. In the cation, the tetrahedral angles around the P atom are nearly undistorted. In the crystal, the cations and anions are linked by C—H⋯S, C—H⋯N and C—H⋯Cl hydrogen bonds
An Integrated Contraflow Strategy for Multimodal Evacuation
To improve the efficiency of multimodal evacuation, a network aggregation method and an integrated contraflow strategy are proposed in this paper. The network aggregation method indicates the uncertain evacuation demand on the arterial subnetwork and balances accuracy and efficiency by refining the local road subnetworks. The integrated contraflow strategy contains three arterial configurations: noncontraflow to shorten the strategy setup time, full-lane contraflow to maximize the evacuation network capacity, and bus contraflow to realize the transit cycle operation. The application of this strategy takes two steps to provide transit priority during evacuation: solve the transit-based evacuation problem with a minimum-cost flow model, firstly, and then address the auto-based evacuation problem with a bilevel network flow model. The numerical results from optimizing an evacuation network for a super typhoon justify the validness and usefulness of the network aggregation method and the integrated contraflow strategy
Ethyl 3-bromo-1-(3-chloro-2-pyridyl)-4,5-dihydro-1H-pyrazole-5-carboxylate
The title compound, C11H11BrClN3O2, contains two molecules in the asymmetric unit in which the dihedral angles between the pyrazole and pyridine rings are 30.0 (2) and 22.3 (2)°
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Quantification of atherosclerotic plaque volume in coronary arteries by computed tomographic angiography in subjects with and without diabetes.
BackgroundDiabetes mellitus (DM) is considered a cardiovascular risk factor. The aim of this study was to analyze the prevalence and volume of coronary artery plaque in patients with diabetes mellitus (DM) vs. those without DM.MethodsThis study recruited consecutive patients who underwent coronary computed tomography (CT) angiography (CCTA) between October 2016 and November 2017. Personal information including conventional cardiovascular risk factors was collected. Plaque phenotypes were automatically calculated for volume of different component. The volume of different plaque was compared between DM patients and those without DM.ResultsAmong 6381 patients, 931 (14.59%) were diagnosed with DM. The prevalence of plaque in DM subjects was higher compared with nondiabetic group significantly (48.34% vs. 33.01%, χ = 81.84, P < 0.001). DM was a significant risk factor for the prevalence of plaque in a multivariate model (odds ratio [OR] = 1.465, 95% CI: 1.258-1.706, P < 0.001). The volume of total plaque and any plaque subtypes in the DM subjects was greater than those in nondiabetic patients significantly (P < 0.001).ConclusionThe coronary artery atherosclerotic plaques were significantly higher in diabetic patients than those in non-diabetic patients
N/P Co-doped Micro-/Mesoporous Carbons Derived from Polyvinyl Pyrrolidone–Zn0.2@ZIF-67 with Tunable Metal Valence States towards Efficient Water Splitting
202407 bcchVersion of RecordOthersPolyU RCRE (1-BBCB) and RI-IWEAR (1-CD8E).PublishedC
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