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Experimental study of transient pressure wave in the behind armor blunt trauma induced by different rifle bullets

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Defence Technology（防务技术） 2020年第4期16卷 900-909页

作者： Rui-guo Han Yong-jie Qu Wen-min yan Bin Qin shu Wang Jian-zhong Wang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081PR China Science and Technology on Transient Impact Laboratory Beijing102202PR China

Pressure wave plays an important role in the occurrence of behind armor blunt trauma(BABT),and ballistic gelatin is widely used as a surrogate of biological tissue in the research of *** of pressure wave in the gelatin behind armor for different rifle bullets is *** aim of this study was to observe dynamic changes in pressure wave induced by ballistic blunt impact on the armored gelatin block and to compare the effects of bullet type on the parameters of the transient pressure *** gelatin blocks protected with National Institute of Justice(NIJ) class III bulletproof armor were shot by three types of rifle bullet with the same level of impact *** transient pressure signals at five locations were recorded with pressure sensors and three parameters(maximum pressure,maximum pressure impulse,and the duration of the first positive phase) were determined and *** results indicated that the waveform and the twin peak of transient pressure wave were not related to the bullet ***,the values of pressure wave's parameters were significantly affected by bullet ***,the attenuation of pressure amplitude followed the similar law for the three *** findings may be helpful to get some insight in the BABT and improve the structure design of bullet.

关键词： Behind armor blunt trauma Ballistic gelatin Pressure wave Body armor

sDR5-Fc inhibits macrophage M1 polarization by blocking the glycolysis

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Journal of Geriatric Cardiology 2021年第4期18卷 271-280页

作者： Guang-Yao ZHAI shu-yan QIE Qian-Yun guo Yue QI Yu-Jie ZHOU Department of Cardiology Beijing Anzhen HospitalCapital Medical UniversityBeijing Institute of Heart Lung and Blood Vessel DiseaseBeijing Key Laboratory of Precision Medicine of Coronary Atherosclerotic DiseaseClinical Center for Coronary Heart DiseaseCapital Medical UniversityBeijingChina Department of Rehabilitation Beijing Rehabilitation Hospital of Capital Medical UniversityBeijingChina Department of Epidemiology Beijing Anzhen HospitalCapital Medical UniversityBeijing Institute of Heart Lung and Blood Vessel DiseaseBeijingChina

BACKGROUND M1 polarization of macrophages is an important pathological process in myocardial ischemia reperfusion injury, which is the major obstacle for the treatment of acute myocardial infarction. Currently, the strategies and mechanisms of inhibiting M1 polarization are poorly explored. This study aims to investigate the role of soluble death receptor 5-Fc(s DR5-Fc) in regulating M1 polarization of macrophages under extreme conditions and explore the mechanisms from the aspect of *** Extreme conditions were induced in RAW264.7 cells. Real-time quantitative polymerase chain reaction and western blot were used to detect the expression of m RNA and proteins, respectively. Cell counting kit-8 was used to investigate the proliferation activity of cells. Expression levels of inflammatory cytokines were determined by enzyme-linked immunosorbent *** We found that s DR5-Fc rescues the proliferation of macrophages under extreme conditions, including nutrition deficiency, excessive peroxide, and ultraviolet irradiation. In addition, administration of s DR5-Fc inhibits the M1 polarization of macrophages induced by lipopolysaccharide(LPS) and interferon-gamma(IFN-γ), as the expression of M1 polarization markers CD86, CXC motif chemokine ligand 10, matrix metalloproteinase 9, and tumor necrosis factor-α, as well as the secretion of inflammatory factors interleukin(IL)-1β and IL-6, were significantly decreased. By further investigation of the mechanisms, the results showed that s DR5-Fc can recover the LPS and IFN-γ induced p H reduction, lactic acid elevation, and increased expression of hexokinase 2 and glucose transporter 1, which were markers of glycolysis in *** s DR5-Fc inhibits the M1 polarization of macrophages by blocking the glycolysis, which provides a new direction for the development of strategies in the treatment of myocardial ischemia reperfusion injury.

关键词： RNA IFN sDR5-Fc inhibits macrophage M1 polarization by blocking the glycolysis

A simple image-based method for online moisture content estimation of iron ore green pellets

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Journal of Iron and Steel Research International 2023年第5期30卷 851-863页

作者： shu-yi Zhou Xiao-yan Liu College of Electrical and Information Engineering Hunan UniversityChangsha 410082HunanChina Innovation Institute of Industrial Design and Machine Intelligence Quanzhou-Hunan University Quanzhou 362006FujianChina

Moisture content(MC)is an important quality metric of iron ore green pellets in pelletizing process in ironmaking *** image-based methods for MC estimation may result in big errors for gray-scale pellet images captured under various lighting *** proposed a simple image-based method to improve the MC estimation accuracy by illumination correction and linear regression ***,the illumination of the pellet image was transformed into the reference illumination by use of a color checker chart and piecewise linear interpolation,so that the influence of different illuminations could be greatly *** experimental analysis,it was found that MC is approximately adversely proportional to the average intensity of the transformed images.A simple model for MC prediction was then established by linear *** demonstrated that the proposed method has good robustness to different lighting conditions and achieves the best performance in metrics of mean square error,mean absolute error and maximum absolute error in comparison with five state-of-art MC estimating *** on a working disk pelletizer shows that the proposed method can predict well the change of moisture content with time,and its computing efficiency can satisfy the requirement for online MC monitoring during the pelletizing process.

关键词： Green pellet Moisture content Image processing Pelletizing process

Application of UAV Multisensor Data and Ensemble Approach for High-Throughput Estimation of Maize Phenotyping Traits

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Plant Phenomics 2022年第1期4卷 110-126页

作者： Meiyan shu shuaipeng Fei Bingyu Zhang Xiaohong yang yan guo Baoguo Li Yuntao Ma College of Land Science and Technology China Agricultural UniversityBeijing 100091China State Key Laboratory of Plant Physiology and Biochemistry National Maize Improvement Center of ChinaChina Agricultural UniversityBeijing 100091China

High-throughput estimation of phenotypic traits from UAV(unmanned aerial vehicle)images is helpful to improve the screening efficiency of breeding *** estimating phenotyping traits of breeding maize at plot scale helps to promote gene mining for specific traits and provides a guarantee for accelerating the breeding of superior *** an efficient and accurate estimation model is the key to the application of UAV-based multiple sensors data.

关键词： breeding estimation traits

Simulation of multi-axis grinding considering runout based on envelope theory

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Chinese Journal of Aeronautics 2020年第12期33卷 3526-3534页

作者： yan JIANG Qiang guo School of Mechanical&Power Engineering Henan Polytechnic UniversityJiaozuo 454150China

As one of the most important methods for machining process with high accuracy,ultra-precision grinding is widely used in fields such as aerospace,automotive and mold,***,it is common that wheel and spindle axis do not coincide with each other due to wheel settings,machining errors and so *** could result in the generation of wheel runout,which may reduce the machining surface's *** this paper,combining this phenomenon,an analytic algorithm method for the multi-axis grinding process is introduced according to the envelope *** that,the accuracy of this method is *** experiments are carried out on a 5-axis machining *** artificial runout is set up and calculated utilizing the least square ***,using the presented method,two examples with and without runout are introduced to illustrate the validation of the proposed *** error due to the runout effect is also analyzed.

关键词： Analytic algorithm Complex surface Envelope theory Multi-axis grinding Wheel runout

Silver dissolution in a novel leaching system: Reaction kinetics study

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International Journal of Minerals,Metallurgy and Materials 2019年第2期26卷 168-177页

作者： Li Xiao Pei-wei Han Yong-liang Wang guo-yan Fu Zhi Sun shu-feng Ye State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

Effective silver recovery is usually restricted by either environmental pollution or high recovery costs. To tackle the issues, this study introduces a novel method for the effective recovery of silver by utilizing the alkaline sodium thiosulfate-potassium ferricyanide leaching system. The reaction kinetics of silver dissolution in this system was investigated via the rotating disk electrode technology. The influences of important parameters, including the rotation speed, sodium thiosulfate concentration, potassium ferricyanide concentration, and temperature, on the silver dissolution rate were systematically investigated. The activation energy was measured to be 17.96 kJ·mol^(-1) when the silver dissolution was controlled by a diffusion process. When the silver dissolution was in the region of mixed control, the reaction orders of ferricyanide and thiosulfate were found to be 0.57 and 0.19, respectively, and the reaction orders of ferricyanide and thiosulfate were 0.55 and 0.22, respectively, when the silver dissolution was controlled by surface reaction. This study has great potential for the development of an environmentally friendly silver recovery process from end-of-life products.

关键词： silver recovery thiosulfate ferricyanide dissolution kinetics non-cyanide

Modelling Effect of Circulation Flow Rate on Inclusion Removal in RH Degasser

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Journal of Iron and Steel Research International 2016年第12期23卷 1243-1248页

作者： shu-guo ZHENG Miao-yong ZHU School of Metallurgy Northeastern University

Based on the similarity principles, a 1 ： 7 scale physical model was established to study the behavior of molten steel flow and inclusion removal in a 145 t Rheinsahl-Heraeus （RH） degasser. On the basis of the quantitative measurements of the circulation flow rate and inclusion removal under various lifting gas flow rates, the effect of circulation flow rate on inclusion removal was investigated in the RH degasser. The inclusion removal rate shows the trend of first increase and then decrease twice with increasing the circulation flow rate when the circulation flow rates are smaller than 104.7 L/min. Whereas, the inclusion removal rate increases again with the further increase in circu- lation flow rate when the circulation flow rate is larger than 104.7 L/min. At lower circulation flow rates, inclusions are mainly removed by Stokes flotation to the slag/steel interface after inclusions are transferred near the slag/steel interface by the circulation flow. At higher circulation flow rates, the collision and aggregation of inclusions improves the inclusion removal efficiency. With the further increase in the circulation flow rate, inclusions are mainly removed by following the turbulent fluctuation （turbulent diffusion） to the slag/steel interface after inclusions are transferred near the slag/steel interface by the circulation flow.

关键词： RH degasser lifting gas flow rate circulation flow rate inclusion removal physical modelling

Optimization of electrical parameters for micro-arc oxidation of zirconium hydride alloy

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Rare Metals 2022年第7期41卷 2324-2330页

作者： Zhi-Gang Wang Wei-Dong Chen shu-Fang yan Xiu-Juan Fan Feng guo Zhi-Gao Xu College of Materials and Engineering Inner Mongolia University of TechnologyHohhot 010051China Division of Mineral Resources Metallurgy and MaterialsGeneral Research Institute for Nonferrous MetalsBeijing 100088China Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of TechnologyWuhan 430073China

The present work aims to present the micro-arc oxidation(MAO)zirconia coating with superior compact-ness and moderate thickness on zirconium *** experiments were designed according to L16(44)orthog-onal array to optimize electrical parameters(frequency,negative voltage,positive voltage and MAO time),with four levels of each *** optimized value was pre-dicted and verified by the confirmation *** anti-permeation effect was tested by means of vacuum dehydrogenation *** optimized coating parameters are listed as follows:treating time of 25 min,frequency of 200 Hz,negative voltage of 150 V and pos-itive voltage of 380 *** results show that the optimized coating exhibits the highest compactness of 0.3705 mg·μm^(-1).This dense coating significantly enhan-ces the hydrogen anti-permeation effects,and the PRF value is improved by nearly 13 times in contrast with that of uncoated ZrH_(1.8).

关键词： coating alloy zirconium

Heterogeneous Fenton-like discoloration of methyl orange using Fe3O4/MWCNTs as catalyst： process optimization by response surface methodology

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Frontiers of Materials Science 2016年第1期10卷 45-55页

作者： Huan-yan XU Tian-Nuo SHI Hang ZHAO Li-guo JIN Feng-Chun WANG Chun-yan WANG shu-yan QI School of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China

Fe3O4/MWCNTs nanocomposites were prepared by chemical oxidation coprecipitation method and developed as highly efficient heterogeneous Fenton-like catalyst. XRD results revealed that Fe3O4 nanoparticles deposited onto MWCNTs surface remained the inverse spinel crystal structure of cubic Fe3O4 phase. The FTIR characteristic peaks of MWCNTs weakened or disappeared due to the anchor of Fe3O4 nanoparticles and Fe-O peak at 570 cm^-1 was indicative of the formation of Fe3O4. TEM observation revealed that Fe3O4 nanoparticles were tightly anchored by MWCNTs. The Fenton-like catalytic activity of Fe3O4/MWCNTs nanocomposites for the discoloration of methyl orange （MO） was much higher than that of Fe3O4 nanoparticles. The process optimization of this heterogeneous Fenton-like system was implemented by response surface methodology （RSM）. The optimum conditions for MO discoloration were determined to be of 12.3 mmoi/L H2O2 concentration, 2.9 glL catalyst dosage, solution pH 2.7 and 39.3 min reaction time, with the maximum predicted value for MO discoloration ratio of 101.85%. The corresponding experimental value under the identical conditions was obtained as 99.86%, which was very close to the predicted one with the absolute deviation of 1.99%.

关键词： Fe3O4/MWCNTs Fenton-like catalyst azo dye response surface methodology