623 hasil untuk "Cheng He"
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Experimenting with new ingredients for health: Asian plants in women’s recipe books in early modern Britain
This paper explores the role of early modern British women in incorporating Asian plants into healthcare practices. As plant circulation across Eurasia increased, knowledge of medicinal ingredients evolved, especially those from Asia. While physicians and botanists copied and translated recipes…
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Regularity for solutions to the Navier-Stokes equations with one velocity component regular
In this paper, we establish a regularity criterion for solutions to the Navier-stokes equations, which is only related to one component of the velocity field. Let $(u, p)$ be a weak solution to the Navier-Stokes equations. We show that if any one component of the velocity field $u$, for example…
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Remark on the spatial regularity for the Navier-Stokes equations
Let u be a Leray-Hopf weak solution to the Navier-Stokes equations. We will show that the set of possible singular points of the vector field resulting from integrating the velocity u with respect to time has Hausdorff dimension zero.
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Underwater Target Direction of Arrival Estimation by Small Acoustic Sensor Array Based on Sparse Bayesian Learning
Assuming independently but identically distributed sources, the traditional DOA (direction of arrival) estimation method of underwater acoustic target normally has poor estimation performance and provides inaccurate estimation results. To solve this problem, a new high-accuracy DOA algorithm based…
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Numerical Modelling Approaches for Assessing Improvements to the Flow Circulation in a Small Lake
Kamaniskeg Lake is a long, narrow, and deep small lake located in the northern part of Ontario, Canada. The goals of this paper were to examine various options to improve the water quality in the northern part of the lake by altering the local hydraulic flow conditions. Towards this end, a…
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4-[3-(2H-Benzotriazol-2-yl)propoxy]-3-methoxybenzaldehyde
In the title compound, C17H17N3O3, the 3-methoxybenzaldehyde group and the benzotriazole fragment are connected through a flexible oxypropyl chain. The O—C—C—C torsion angle in the central link is −63.9 (2)°, while the plane of the benzene ring of the…
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2,2′,2′′,2′′′-[Pyridine-2,6-diylbis(methylenenitrilo)]tetraethanol
In the crystal structure of the title compound C(15)H(27)N(3)O(4), the molecule is located on a twofold axis and the asymmetric unit contains one half-molecule, with one N and one C atom lying on the rotation axis. The pyridine ring is the hydrogen-bond acceptor, while two hydroxyl O atoms act as…
Juga tersedia di: DOAJ
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Comparative Analysis and Phylogenetic Study of Dawkinsia filamentosa and Pethia nigrofasciata Mitochondrial Genomes
Smiliogastrinae are recognized for their high nutritional and ornamental value. In this study, we employed high-throughput sequencing technology to acquire the complete mitochondrial genome sequences of Dawkinsia filamentosa and Pethia nigrofasciata. The gene composition and arrangement order in…
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Optimization and Analysis of Hybrid Electric System for Distributed Propulsion Tilt-Wing UAV
Hybrid electric distributed propulsion tilt-wing UAVs show unlimited application prospects due to their high propulsion efficiency and vertical take-off and landing capabilities. Aiming at the power requirements of distributed propulsion tilt-wing UAVs, this article presents an optimization design…
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Impacts of Courtyard Envelope Design on Energy Performance in the Hot Summer–Cold Winter Region of China
This paper aims to investigate the effects of courtyard envelope design on the energy performance of office buildings in the hot summer–cold winter region of China. Two types of courtyard buildings were simulated with 200 energy models by changing the following variables: window–wall ratio (south…
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Prediction value of serum TMAO on myocardial injury after PCI in patients with coronary heart disease based on decision curve analysis
Objective To explope the predictive efficacy of serum trimethylamine N ⁃ oxide（TMAO）on myocardial injury after percutaneous coronary intervention（PCI）in patients with coronary heart disease. Methods A total of 200 patients with coronary heart disease who received PCI in Nanchong Central Hospital…
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Research Progress on Grassland Eco-Assets and Eco-Products and Its Implications for the Enhancement of Ecosystem Service Function of Karst Desertification Control
Grasslands in karst ecological fragile areas can effectively mitigate climate change, conserve biodiversity, maintain human well-being, and play a significant role in improving the health of regional ecosystems and farmers’ livelihoods. Thus, the study of grassland ecological assets and ecological…
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Double Cuckoo Search Algorithm with Dynamically Adjusted Probability
Cuckoo search algorithm is an emerging bionic intelligent algorithm, which has the shortages of low search precision, easy to fall into local optimum and slow convergence speed. Double cuckoo search algorithm with dynamically adjusted probability (DECS) is proposed. Firstly, the population…
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On Fixed-Wing Drone-Enabled Covert Transmission with Mobility Restrictions and QoS Requirement
This article examines a fixed-wing drone (FWD)-enabled covert transmission, where the FWD performs a level flight within a circular area with a radius of rR meters and serves as a mobile transmitter to covertly deliver data to a ground receiver situated d0 meters away from a ground detector. First…
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Similarity Design Method of the Inflatable Buffer Landing System
The inflatable buffer landing system, such as the airbag, has been widely used for deep space exploration as a low-cost entry. The impact performance of an airbag landing attenuation system on Mars had to be proven through cushion testing on Earth. In this paper, a design method for the airbag…
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Screening, identification and application of superior lactic acid bacterium in Enshi pickle
To improve the flavor and quality of Enshi pickle, the superior lactic acid bacterium with strong acid-producing capacity was screened from local Enshi radish pickle and pickling water, and morphological observations and molecular biological identification were conducted. The screened strains were…
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Experiment on Heat Transfer Characteristics of Supercritical Nitrogen in Vertical Tube for Open Rack Vaporizer
Open rack vaporizers are basic load vaporizers that are widely used in LNG terminals. However, there are few experimental studies on the fluid flow and heat transfer behaviors of supercritical natural gas. In this study, nitrogen was used to replace natural gas, and the heat transfer…