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Your search keyword '"Lei, Zhihui"' showing total 42 results
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42 results on '"Lei, Zhihui"'

15. Genome-Wide Selective Signatures Reveal Candidate Genes Associated with Hair Follicle Development and Wool Shedding in Sheep

Author

Lei, Zhihui, primary, Sun, Weibo, additional, Guo, Tingting, additional, Li, Jianye, additional, Zhu, Shaohua, additional, Lu, Zengkui, additional, Qiao, Guoyan, additional, Han, Mei, additional, Zhao, Hongchang, additional, Yang, Bohui, additional, Zhang, Liping, additional, Liu, Jianbin, additional, Yuan, Chao, additional, and Yue, Yaojing, additional

Published
2021
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20. The mechanism of Cu (II) adsorption onto 2,3-dialdehyde nano-fibrillated celluloses

Author

Wenhua Gao, Jinsong Zeng, Jun Xu, Lei Zhihui, and Bin Wang

Subjects
Aqueous solution, Polymers and Plastics, Metal ions in aqueous solution, Organic Chemistry, Inorganic chemistry, Enthalpy, Periodate, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Gibbs free energy, symbols.namesake, chemistry.chemical_compound, Adsorption, chemistry, Chemisorption, Specific surface area, Materials Chemistry, symbols, 0210 nano-technology
Abstract

Nano-fibrillated celluloses (NFCs) were separated from bleached softwood kraft pulp. Through the periodate oxidation method, 2,3-dialdehyde nano-fibrillated celluloses (DNFCs) with varied aldehyde content were prepared. The high aldehyde content, large specific surface area and high surface charge density of DNFCs benefited the adsorbing of Cu (II). The adsorption kinetics and isotherms presented good correlations with the Pseudo-second-order model and Freundlich model, respectively. Both physical and chemical adsorptions existed in the Cu (II) adsorption by DNFCs, while chemisorption was the rate-limiting step. The adsorption thermodynamic parameters Gibbs free energy change (ΔG), enthalpy change (ΔH) and entropy change (ΔS) were also investigated. This study provides theoretical support for applying DNFCs to remove metal ions from aqueous solutions.

Published
2020

36. Videometric terminal guidance method and system for UAV accurate landing

Author

Zhou, Xiang, Lei, Zhihui, Yu, Qifeng, Zhang, Hongliang, Shang, Yang, Du, Jing, Gui, Yang, and Guo, Pengyu

Abstract

We present a videometric method and system to implement terminal guidance for Unmanned Aerial Vehicle(UAV) accurate landing. In the videometric system, two calibrated cameras attached to the ground are used, and a calibration method in which at least 5 control points are applied is developed to calibrate the inner and exterior parameters of the cameras. Cameras with 850nm spectral filter are used to recognize a 850nm LED target fixed on the UAV which can highlight itself in images with complicated background. NNLOG (normalized negative laplacian of gaussian) operator is developed for automatic target detection and tracking. Finally, 3-D position of the UAV with high accuracy can be calculated and transfered to control system to direct UAV accurate landing. The videometric system can work in the rate of 50Hz. Many real flight and static accuracy experiments demonstrate the correctness and veracity of the method proposed in this paper, and they also indicate the reliability and robustness of the system proposed in this paper. The static accuracy experiment results show that the deviation is less-than 10cm when target is far from the cameras and lessthan 2cm in 100m region. The real flight experiment results show that the deviation from DGPS is less-than 20cm. The system implement in this paper won the first prize in the AVIC Cup-International UAV Innovation Grand Prix, and it is the only one that achieved UAV accurate landing without GPS or DGPS.

Published
2012
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37. Experimental method of dynamic caustics and its application in fracture mechanics

Author

Su Xian-ji and Lei Zhihui

Subjects
Materials science, Series (mathematics), Position (vector), Mechanical Engineering, Computational Mechanics, Fracture (geology), Fracture mechanics, Mechanics, Crack growth resistance curve, Intensity (heat transfer), Beam (structure), Stress intensity factor, Physics::Geophysics
Abstract

The equation of static and dynamic caustics, and the formulae determining the position of crack tip and stress intensity factor are given. It is proven that for the case of low speed of crack propagation the static formula is applicable in calculation. A simple method to measure the static stress-optical constants is proposed. An Optical system which is suitable for the experiments of dynamic caustics was set-up and used to study the fracture in beam and rings with initial crack under impact loading. A series of dynamic caustics' photographs and curves showing the variations of corresponding crack lengths and dynamic stress intensity factors with time, are presented.

Published
1987

42. Combined Intracoronary Prourokinase Thrombolysis on Myocardial Perfusion and Vascular Endothelial Function in STEMI.

Author

Che S, Guo X, Lei Z, and Lin S

Subjects
Humans, Male, Middle Aged, Female, Aged, Endothelium, Vascular physiopathology, Endothelium, Vascular drug effects, Treatment Outcome, Urokinase-Type Plasminogen Activator administration & dosage, Fibrinolytic Agents administration & dosage, Fibrinolytic Agents therapeutic use, Fibrinolytic Agents adverse effects, Recombinant Proteins, ST Elevation Myocardial Infarction physiopathology, ST Elevation Myocardial Infarction therapy, ST Elevation Myocardial Infarction surgery, Percutaneous Coronary Intervention, Thrombolytic Therapy methods, Thrombolytic Therapy adverse effects
Abstract

Background: This study aimed to investigate the effects of intracoronary prourokinase thrombolysis combined with emergency percutaneous coronary intervention (PCI) on myocardial perfusion and vascular endothelial function in patients with acute ST-segment elevation myocardial infarction (STEMI)., Methods: A total of 104 patients with STEMI were collected from August 2020 to August 2022, and were divided into control group and observation group in a random manner. The control group received PCI directly, and the observation group received intracoronary prourokinase thrombolytic therapy before PCI. The treatment effects were evaluated by measuring the cardiac function indexes, including left ventricular end-diastolic diameter (LVEDD), left ventricular end-systolic diameter (LVESD), and left ventricular ejection fraction (LVEF), the TIMI myocardial perfusion grade, the vascular endothelial indexes, including soluble intercellular adhesion molecule-1 (sICAM-1) and soluble vascular cell adhesion molecule-1 (sVCAM-1), the von Willebrand factor (vWF), the myocardial injury indexes, including cardiac troponin I (cTnI), creatine kinase isoenzyme MB (CK-MB), and lactate dehydrogenase (LDH), and the inflammatory factors, including myeloperoxidase (MPO), C-reactive protein (CRP), and interleukin-6 (IL-6). Furthermore, the treatment safety was assessed by recording the incidence of major MACE events, 6 months after the operation., Results: After treatment, LVEDD and LVESD were lower in the observation group than in the control group, and LVEF was higher (p < 0.05). The TIMI myocardial perfusion grade in the observation group was higher than in the control group, after treatment (p < 0.05). The levels of sICAM-1, sVCAM-1, and vWF were higher in the observation group than in the control group (p < 0.05). The levels of cTnI, CK-MB, and LDH in the observation group were lower than those in the control group, 24 hours after surgery. At 3 days after surgery, MPO was lower in the observation group than in the control group, and CRP and IL-6 were higher (p < 0.05). The incidence of major MACE events in the observation group was lower than that in the control group, 6 months after surgery (p < 0.05). There was 1 case of puncture site bleeding in the observation group, 1 case of puncture site bleeding and 1 case of subcutaneous ecchymosis in the control group, but no serious bleeding events, such as internal bleeding or cerebral hemorrhage, in the two groups., Conclusions: Intracoronary prourokinase thrombolytic therapy combined with emergency PCI can promote the recovery of cardiac function, improve myocardial perfusion and vascular endothelial function, and reduce inflammation and the incidence of major postoperative MACE events in acute STEMI patients.

Published
2024
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