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Advances in the Researches of the Middle and Upper Atmosphere in China

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空间科学学报 2018年第5期38卷 763-780页

作者： CHEN Zeyu CHEN Hongbin XU Jiyao L Daren ZHANG Shaodong XUE Xianghui TIAN Wenshou LIU Renqiang CHEN Wen hu Yongyun WANG Rui hu Dingzhu hu Xiong YANG Guotao GONG Yun LU Gaopeng Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 National Space Science Center Chinese Academy of Sciences Beijing 100190 School of Electronic

In this paper we summarize the research results by Chinese scientists in 2016–2018. The focuses are placed on the researches of the middle and upper atmosphere, specifically the researches associated with groundbased observation capability development, dynamical processes, and properties of circulation and chemistryclimate coupling of the middle atmospheric layers.

关键词：中国科学家空气能力开发

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Sea-surface reflection-aided underwater localization with unknown sound speed

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Science China(Information Sciences) 2019年第4期62卷 209-211页

作者： Bingbing ZHANG Yongchang hu Hongyi WANG Zhaowen ZhuANG School of Electronic Science National University of Defense Technology Xi'an Research Center Cloud Core Network Product Line/R&D Mgmt Huawei Technologies Co. Ltd

Dear editor,The problem of underwater localization has drawn considerable attention in recent years [1]. However, it is quite challenging due to a lack of measurements and the unknown sound propagation speed(SPS), eve... 详细信息

关键词： Sea-surface reflection-aided underwater localization with unknown sound speed

Three New Classes of Subsystem Codes

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Wuhan University Journal of Natural Sciences 2024年第1期29卷 38-44页

作者： LI hui LIU Xiusheng hu Peng School of Mathematics and Physics Hubei Polytechnic UniversityHuangshi 435003HubeiChina College of Arts and Science Hubei Normal UniversityHuangshi 435003HubeiChina

In this paper,we construct three classes of Clifford subsystem maximum distance separable(MDS)codes based on Reed-Solomon codes and extended generalized Reed-Solomon codes over finite fields Fq for specific code ***,o... 详细信息

关键词： Clifford subsystem codes Reed-Solomon codes generator matrices

F-box and leucine-rich repeat 6 promotes gastric cancer progression via the promotion of epithelial-mesenchymal transition

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World Journal of Gastrointestinal Oncology 2023年第3期15卷 490-503页

作者： Lei Meng Yu-Ting hu A-Man Xu Department of General Surgery First Affiliated Hospital of Anhui Medical UniversityHefei 230022Anhui ProvinceChina Department of Immunology College of Basic MedicineAnhui Medical UniversityHefei 230022Anhui ProvinceChina

BACKGROUND F-box and leucine-rich repeat 6(FBXL6)have reportedly been associated with several cancer ***,the role and mechanisms of FBXL6 in gastric cancer(GC)require further *** To investigate the effect of FBXL6 in GC tissues and cells and the underlying *** TCGA and GEO database analysis was performed to evaluate the expression of FBXL6 in GC tissues and adjacent normal *** transcription-quantitative polymerase chain reaction,immunofluorescence,and western blotting were used to detect the expression of FBXL6 in GC tissue and cell *** clone formation,5-ethynyl-2’-deoxyuridine(EdU)assays,CCK-8,transwell migration assay,and wound healing assays were performed to evaluate the malignant biological behavior in GC cell lines after transfection with FBXL6-shRNA and the overexpression of FBXL6 ***,in vivo tumor assays were performed to prove whether FBXL6 promoted cell proliferation in *** FBXL6 expression was upregulated more in tumor tissues than in adjacent normal tissues and positively associated with clinicopathological *** outcomes of CCK-8,clone formation,and Edu assays demonstrated that FBXL6 knockdown inhibited cell proliferation,whereas upregulation of FBXL6 promoted proliferation in GC ***,the transwell migration assay revealed that FBXL6 knockdown suppressed migration and invasion,whereas the overex pression of FBXL6 showed the opposite *** the subcutaneous tumor implantation assay,it was evident that the knockdown of FBXL6 inhibited GC graft tumor growth in *** blotting showed that the effects of FBXL6 on the expression of the proteins associated with the epithelial-mesenchymal transition-associated proteins in GC *** Silencing of FBXL6 inactivated the EMT pathway to suppress GC malignancy in ***6 can potentially be used for the diagnosis and targeted therapy of patients with GC.

关键词： Gastric cancer F-box and leucine-rich repeat 6 Invasion Epithelial-mesenchymal transition Metastasis

Preparation of Modified UiO-66 Catalyst and Its Catalytic Performance for NH_(3)-SCR Denitration

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Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 261-267页

作者：吴彦霞梁海龙 CHEN Yufeng hu Liming WANG Chunpeng Ceramics Science Institute China Building Materials AcademyBeijing 100002China

Zirconium-based metal-organic framework UiO-66 was successfully prepared by solvothermal method,and UiO-66 was modified by adding regulators such as formic acid,acetic acid,and hydrochloric *** NH_(3)-SCR reactivity of the samples was evaluated by the denitration activity evaluation system,and the UiO-66 and the regulator-modified UiO-66 were characterized by XRD,SEM,BET,FTIR,TG,NH_(3)-TPD,etc.,the effects of regulator types on the structure and properties of UiO-66 were *** experimental results show that,after adding the modifier,the morphology of UiO-66 changes from irregular quadrilateral with serious agglomeration to particles with regular crystal shape and good dispersibility,and the crystal morphology of the catalyst is *** addition,after adding the modifier,UiO-66 has a larger specific surface area and stronger surface acidity,which optimizes the catalytic performance of *** catalytic performance test results of NH_(3)-SCR show that the low-temperature activity of UiO-66 is poor,and it only shows a certain catalytic activity at higher *** catalytic activity of UiO-66 was significantly improved after adding the *** them,the UiO-66-HCl modified with hydrochloric acid had the best catalytic activity,and the denitration rate reached 70%when the denitration temperature was 380℃.

关键词： UiO-66 catalyst catalytic denitration NH_(3)-SCR modified

Towards enriching and isolation of uncultivated archaea from marine sediments using a refined combination of conventional microbial cultivation methods

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Marine Life Science & Technology 2021年第2期3卷 231-242页

作者： Haining hu Vengadesh Perumal Natarajan Fengping Wang State Key Laboratory of Microbial Metabolism School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai200240China School of Oceanography Shanghai Jiao Tong UniversityShanghai200240China

The archaea that can be readily cultivated in the laboratory are only a small fraction of the total diversity that exists in *** molecular ecology methods,such as metagenomic sequencing,can provide valuable information independent of cell cultivation,it is only through cultivation-based experiments that they may be fully characterized,both for their physiological and ecological ***,we report our efforts towards enriching and isolation of uncultivated archaea from marine sediments using a refined combination of conventional microbial cultivation ***,cells were retrieved from the sediment samples through a cell extraction procedure and the sediment-free mixed cells were then divided into different size-range fractions by successive filtration through 0.8µm,0.6µm and 0.2µm *** 16S rRNA gene analyses indicated noticeable retention of different archaeal groups in different *** each fraction,supplementation with a variety of defined substrates(e.g.,methane,sulfate,and lignin)and stepwise dilutions led to highly active enrichment cultures of several archaeal groups with Bathyarchaeota most prominently ***,using a roll-bottle technique,three co-cultures consisting of Bathyarchaeota(subgroup-8)and a bacterial species affiliated with either Pseudomonas or Glutamicibacter were *** results demonstrate that a combination of cell extraction,size fractionation,and roll-bottle isolation methods could be a useful protocol for the successful enrichment and isolation of numerous slow-growing archaeal groups from marine sediments.

关键词： Microbial cultivation Marine sediments Uncultivated archaea Co-culture Bathyarchaeota

Activating Flux Design for Laser Weldingof Ferritic Stainless Steel

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Transactions of Tianjin University 2014年第6期20卷 429-434页

作者： Ma Li School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Advanced Joining Technology Tianjin 300072China Research Institute Baoshan Iron & Steel Co.Ltd.Shanghai 200431China

The behaviors of YAG laser welding process of ferritic stainless steel with activating fluxes were investigatedin this study. Some conventional oxides, halides and carbonates were applied in laser welding. The resultsshowed that the effect of oxides on the penetration depth was more remarkable. Most activating fluxes improved thepenetration more effectively at low power than that at high power. The uniform design was adopted to arrange theformula of multicomponent activating fluxes, showing that the optimal formula can make the penetration depth up to2.23 times as large as that without flux, including 50% ZrO2, 12.09% CaCO3, 10.43% CaO and 27.48% MgO. Throughthe high-speed photographs of welding process, CaF2 can minimize the plasma volume but slightly improve the penetrationcapability.

关键词： ferritic stainless steel laser welding activating flux

Effect of isothermal heat treatment on semi-solid microstructure of AZ91D magnesium alloy containing rare earth Gd

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China Foundry 2015年第1期12卷 20-25页

作者： Yong hu Li Rao Xu-wu Ni School of Mechanical and Electronical Engineering East China Jiaotong University

The AZ91 D magnesium alloy containing rare earth Gd was prepared in this study, and the effect of semi-solid isothermal heat treatment on the microstructure of the alloy was investigated to obtain an optimum semi-solid structure. Results show that Gd can refine the microstructure of AZ91 D magnesium alloy, and the optimum semi-solid AZ91 D microstructure can be achieved by adding 1.5wt.% Gd. After treated at 585 °C for 30 min, the well distributed rose-shaped and near-spherical semi-solid microstructures of AZ91D+1.5wt.%Gd alloy can be obtained. The liquid phase of the semi-solid alloy consists of three components, namely, the molten pool, the "entrapped liquid" pool and the liner liquid film which separates two neighbor particles. The solid phase is composed of two phases, the primary α-Mg particles and the α-Mg phase formed in the second stage of solidification. With the increase of holding time, melting which causes the decrease of the primary α-Mg particle size is the dominant mechanism in the initial stage while coalescence and Ostwald ripening tend to be the principles later.

关键词： isothermal heat treatment semi-solid processing AZ91D gadolinium

Feature mapping space and sample determination for person re-identification

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High Technology Letters 2022年第3期28卷 237-246页

作者： HOU Wei hu Zhentao LIU Xianxing SHI Changsen School of Artificial Intelligence Henan UniversityZhengzhou 450046P.R.China

Person re-identification(Re-ID) is integral to intelligent monitoring ***,due to the variability in viewing angles and illumination,it is easy to cause visual ambiguities,affecting the accuracy of person *** approach for person re-identification based on feature mapping space and sample determination is *** first,a weight fusion model,including mean and maximum value of the horizontal occurrence in local features,is introduced into the mapping space to optimize local ***,the Gaussian distribution model with hierarchical mean and covariance of pixel features is introduced to enhance feature ***,considering the influence of the size of samples on metric learning performance,the appropriate metric learning is selected by sample determination method to further improve the performance of person *** results on the VIPeR,PRID450 S and CUHK01 datasets demonstrate that the proposed method is better than the traditional methods.

关键词： person re-identification(Re-ID) mapping space feature optimization sample determination