检索结果-南通市图书馆

Aldo-Keto reductase 1C3 reduces myocardial cell damage after acute myocardial infarction by activating the Kelch-like ECH-associated protein 1-nuclear factor erythroid 2-related factor 2-antioxidant response element pathway to inhibit ferroptosis

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2024年第9期21卷 899-912页

作者： Wang MIAO Yun-zhao hu Department of Cardiology Shunde HospitalSouthern Medical Universitythe First People’s Hospital of ShundeFoshanChina The Second School of Clinical Medicine Southern Medical UniversityGuangzhouChina

Background Acute myocardial infarction(AMI)is a high-risk cardiovascular condition associated with increased cellular damage and oxidative ***-Keto Reductase 1C3(AKR1C3)is a stress-regulating ***,its specific role and mechanisms regarding AMI remain *** We assessed cardiac function through echocardiography;tissue damage was evaluated using Hematoxylin and Eosin(HE)and Masson trichrome ***1C3 expression levels were measured through Reverse transcription-quantitative polymerase chain reaction and western *** cell viability using Cell Counting Kit-8 and lactate dehydrogenase(LDH)*** extent of ferroptosis was determined by measuring the levels of Fe2+,boron-dipyrromethane(BODIPY)and malondialdehyde(MDA),the glutathione/glutathione disulfide(GSH/GSSG)ratio,and the expression of Glutathione Peroxidase 4(GPX4)and Solute carrier 7A11(SLC7A11).Kelch-like ECH-associated protein 1-Nuclear factor erythroid 2-related factor 2-Antioxidant response element(Keap1-Nrf2-ARE)pathway activation was analyzed through western ***2 was inhibited with ML385and activated with(R)-Sulforaphane to investigate the Keap1-Nrf2-ARE *** The rats in the AMI group displayed reduced heart function,more tissue damage,and lower AKR1C3 expression compared to the Sham ***,hypoxia-treated H9C2 cells showed reduced viability,and decreased AKR1C3 *** AKR1C3 in H9C2 cells enhanced *** down AKR1C3 exhibited the opposite *** the inhibitors tested,Ferrostatin-1 most effectively restored cell viability in hypoxia-treated H9C2 ***,H9C2 cells subjected to hypoxia suggested Keap1-Nrf2-ARE pathway *** AKR1C3 reduced ferroptosis and activated the Keap1-Nrf2-ARE pathway in hypoxia-treated cells,knocking down AKR1C3 exhibited the opposite *** experiments using ML385 in hypoxia-treated H9C2 cells with overexpressed AKR1C3 showed decreased viabil

关键词： damage Antioxidant myocardial

Effects of External Electric Field on AlN Precipitation and Recrystallization Texture of Deep-drawing 08Al Killed Steel Sheet

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2006年第6期22卷 747-750页

作者： Xiang zhao Zhuochao hu Liang ZUO Key Laboratory for Anisotropy Design and Texture Engineering of Materials （Ministry of Education） Northeastern University Shenyang 110004 China

The effects of an electric field on AIN precipitation and recrystallization texture were investigated. Cold-rolled 08Al killed steel sheets were annealed at 550℃ according to the two-step processes, for various maintaining times, with and without applying an electric field. It was found that the electric field promotes the precipitation of the second phase （AlN particles）, strengthens the γ-fiber and weakens the α-fiber texture component in the recrystallized specimens. A possible explanation for the reinforcement of γ-fiber texture by the electric field is that the second phase AIN particle promotes the growth of γ-fiber at the expense of differently oriented grains.

关键词： Electric field annealing AlN Recrystallization texture 08Al killed steel sheet

Classification using wavelet packet decomposition and support vector machine for digital modulations

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2008年第5期19卷 914-918页

作者： zhao Fucai hu Yihua Hao Shiqi Hefei Inst. of Electronic Engineering Hefei 230037 P. R. China

To make the modulation classification system more suitable for signals in a wide range of signal to noise rate （SNR）, a feature extraction method based on signal wavelet packet transform modulus maxima matrix （WPTMMM） and a novel support vector machine fuzzy network （SVMFN） classifier is presented. The WPTMMM feature extraction method has less computational complexity, more stability, and has the preferable advantage of robust with the time parallel moving and white noise. Further, the SVMFN uses a new definition of fuzzy density that incorporates accuracy and uncertainty of the classifiers to improve recognition reliability to classify nine digital modulation types （i.e. 2ASK, 2FSK, 2PSK, 4ASK, 4FSK, 4PSK, 16QAM, MSK, and OQPSK）. Computer simulation shows that the proposed scheme has the advantages of high accuracy and reliability （success rates are over 98% when SNR is not lower than 0dB）, and it adapts to engineering applications.

关键词： modulation classification wavelet packet transform modulus maxima matrix support vector machine,fuzzy density.

Understanding the roles of Ti on the structure and electrochemical performances of Li2Ru1-xTixO3 cathode materials for Li-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第6期28卷 9-16页

作者： hu zhao Yanchao Shi Li Xue Yingzhi Cheng Zhongbo hu Xiangfeng Liu College of Materials Science and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Inner Mongolia Synthetic Chemical Institute Hohhot 010072Inner MongoliaChina School of Chemical Engineering Shandong University of TechnologyZibo 255049ShandongChina

The lattice doping has been widely used to improve the electrochemical performances of Li-rich cathode materials but the roles of the introduced foreign atoms are still not very ***,a series of Li2Ru1-xTixO3 solid solutions have been synthesized and the roles of Ti doping on the structural and electrochemical properties of Li2RuO3 have been comprehensively *** Rietveld refinement exhibits that the interlayer spacing gradually shortens with increasing Ti *** shrinkage is favorable to the layered structure stability but increases the lithium diffusion *** measurements show that Li2Ru0.8Ti0.2O3 possesses the best cyclability with 196.9 and 196.1 m Ah g-1for charge and discharge capacity retaining after 90 cycles,*** voltammetry scanning indicates that Ti dopant promotes the formation of more peroxo-or superoxo-like species but reduces the initial coulumbic *** of electrochemical impedance spectroscopy display that Ti doping reduces the charge transfer impedance,which facilitates the lithium-ion diffusion across the electrolyteelectrode interface and improves the electronic ***2Ru0.8Ti0.2O3exhibits the best electrochemical performance owing to the balance among all the factors discussed *** study also offers some new insights into optimizing the electrochemical performances of Li-rich cathode materials through the lattice doping.

关键词： Lithium-ion battery Li-rich cathode Ti doping Rietveld refinement

Modulating the mean residence time difference of wide-size particles in a fluidized bed

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第2期26卷 238-244页

作者： hu zhao Jun Li Qingshan Zhu Hongzhong Li State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

For non-catalytic gas-solid reaction, it is desirable to match the mean residence time （MRT） of particles and complete conversion time （tc） in a fluidized bed. In this study, the MRT differences （MRT ratios） between the coarse particles and the fine particles were investigated in a continuous fluidized bed with a side exit by varying the superficial gas velocity, feed composition and particle size ratio, The results show that the MRT ratio increases firstly and then decreases with increasing the gas velocity. By controlling the gas velocity and the feed composi tion of coarse particles, the MRT ratio can be modulated from 1.8 to 10.5 at the gas velocity of 1.0 m-s -1 for the binary mixture with the size ratio of 2.2. The MRT ratio can reach to - 12 at the gas velocity of 1.2 m. s for the particle size ratio of 3.3. The present study has endeavored to obtain fundamental data for an effective plant operation to meet the need of synchronously complete conversion of particles with different sizes during the film diffusion controlling reaction.

关键词： Fluidized bedMean residence timeWide size distributionBinarymixture

Kinetics of recrystallization for twin-roll casting AZ31 magnesium alloy during homogenization

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 570-575页

作者： hu zhao Pei-jie Li Liang-ju He National Center of Novel Materials for International Research Tsinghua University Beijing 100084 China

The kinetics of recrystallization for twin-roll casting AZ31 magnesium alloy with different thicknesses during homogenization was *** is shown that fine grains are first formed at the boundaries of deformed bands in the twin-roll casting *** recrystallized grains with no strain are gradually substituted for the deformed microstructure of twin-roll casting AZ31 magnesium *** incubation temperature and time for the recrystallization of a twin-roll casting AZ31 magnesium alloy strip with a thickness of 3 mm are lower and shorter than those of the 6-mm thick strip,*** 3-mm thick twin-roll casting magnesium alloy has finer grains than the 6-mm thick *** activation energies of recrystallization for twin-roll casting AZ31 magnesium alloy slabs with the thickness of 3 and 6 mm are 88 and 69 kJ/mol,*** kinetics curves of recrystallization for twin-roll casting AZ31 magnesium alloy were obtained.

关键词： magnesium alloys twin-roll casting homogenization kinetics grain size

Vision-based Localization from Three-Line Structures (TLS)

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2013年第3期20卷 48-55页

作者： zhao-Zheng hu Na Li School of Information Engineering Hebei University of Technology

This paper presents a novel vision based localization algorithm from three-line structure ( TLS) .Two types of TLS are investigated: 1) three parallel lines ( Structure I) ; 2) two parallel lines and one orthogonal line ( Structure II) .From single image of either structure,the camera pose can be uniquely computed for vision *** of this paper are as follows: 1 ) both TLS structures can be used as simple and practical landmarks,which are widely available in daily life; 2) the proposed algorithm complements existing localization methods,which usually use complex landmarks,especially in the partial blockage conditions; 3) compared with the general Perspective-3-Lines ( P3L) problem,camera pose can be uniquely computed from either *** proposed algorithm has been tested with both simulation and real image *** a typical simulated indoor condition ( 75 cm-size landmark,less than 7.0 m landmark-to-camera distance,and 0.5-pixel image noises) ,the means of localization errors from Structure I and Structure II are less than 3.0 *** the standard deviations are less than 3.0 cm and 1.5 cm,*** algorithm is further validated with two actual image *** a 7.5 m × 7.5 m indoor situation,the overall relative localization errors from Structure I and Structure II are less than 2.2% and 2.3% ,respectively,with about 6.0 m *** results demonstrate that the algorithm works well for practical vision localization.

关键词： vision-based localization three-line structure camera pose computer vision

Separation,preconcentration and determination of Pb(Ⅱ) in water samples using microcrystalline triphenylmethane loaded with quinolin-8-olate

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2009年第3期20卷 334-338页

作者： Li Na hu zhao Gang Ren College of Chemistry and Chemical Engineering China West Nomal University Nanchong 637002 China

This paper described a novel method for the preconcentration of Pb（II） using microcrystalline triphenylmethane loaded with quinolin-8-olate prior to the determination by flame atomic absorption spectrometry. Pb（II） could be enriched by controlling appropriate condition. The preconcentration factor could reach to 200 and the detection limit of Pb（II） was 0.074 μg/L. The recovery was in a range of 93.5-103% with relative standard deviation of 1.0-2.2%. The proposed method had been successfully applied to the determination of trace Pb（U） in various water samples with satisfactory result.

关键词： Microcrystalline triphenylmethane Quinolin-8-olate Separation Preconcentration and determination

Topological analysis of plasma flow control on corner separation in a highly loaded compressor cascade

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第5期28卷 1277-1286页

作者： Xiao-hu zhao Yun Wu Ying-Hong Li Xue-De Wang Qin zhao Science and Technology on Plasma Dynamics Laboratory Air Force Engineering University

In this paper, flow behavior and topology structure in a highly loaded compressor cascade with and without plasma aerodynamic actuation （PAA） are investigated. Streamline pattern, total pressure loss coefficient, outlet flow angle and topological analysis are considered to study the effect and mechanism of the plasma flow control on corner separation. Results presented include the boundary layer flow behavior, effects of three types of PAA on separated flows and performance parameters, topology structures and sequences of singular points with and without PAA. Two separation lines, reversed flow and backflow exist on the suction surface. The cross flow on the endwall is an important element for the comer separation. PAA can reduce the undertuming and overturning as well as the total pressure loss, leading to an overall increase of flow turning and enhancement of aerodynamic performance. PAA can change the topology structure, sequences of singular points and their corresponding separation lines. Types II and III PAA are much more efficient in controlling comer separation and enhancing aerodynamic performances than type I.

关键词： Plasma aerodynamic actuation - Compressor Cascade Topology structure Corner separation