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Geochemical characteristics of soil selenium and evaluation of Serich land resources in the central area of Guiyang City,China

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Acta Geochimica 2017年第2期36卷 240-249页

作者： Ziping Pan Shaolin He Chaojin li Wei men Chengzhi Yan fang Wang Guizhou Moutai Distillery Co. Ltd. Moutai College Renhuai 564500 China Guizhou Academy of Geological Survey Guiyang 550005 China

Based on the results of multipurpose regional geochemical surveys of the Guizhou Province, geochemical characteristics of soil Se and Se-rich land resources in the central area of Guiyang City were studied and *** conclusions are as follows:(1) the Se content in surface soil of the central area of Guiyang City was 0.17–2.89 mg kg^(-1), and the average was 0.78 mg kg^(-1), which were respectively 2.6 and 3.9 times of the national background value of soil and the world background value of *** Se content in deep soil was 0.11–1.48 mg kg^(-1), and the average was 0.44 mg kg^(-1), which were respectively 1.5 and2.2 times of the national background value of soil and the world background value of soil. The soil Se content decreased with the increase in the soil depth on the vertical profile, and the surface soil had a higher Se content.(2)Distribution of Se content was mainly affected by parent material, physicochemical properties of soil and other components, soil type, and land use type. Parent material played a key role, as the soil Se content was mainly originated from parent rock and increased with the background value of Se in parent rock, physicochemical properties of soil and other components had certain influences upon the Se content. Se was shown to have a significant linear positive correlation with S and organic carbon but no significant correlation with p H value. Se content varied with different types of soil as follows: skeleton soil > yellow soil > paddy soil > limestone soil > purple soil. Land use type also hadcertain influences upon the soil Se content as follows: dry land > construction land > garden plot > grassland =garden plot > forest land.(3) Taking 0.4 mg kg^(-1)B x(Se) <3.0 mg kg^(-1) as the standard for Se-rich soil, Se-rich soil of the study area covered an area of 2224 km^2 and 92.5% of the total area; the remaining is general soil. The study area had no Se-excess soil. Therefore, the central area of Guiyang City has a high pr

关键词： Central area of Guiyang Soils Selenium Geochemical characteristics Evaluation of Se-rich landresource

A Stereo Matching Algorithm Based on Four-Moded Census and Relative Confidence Plane Fitting

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Chinese Journal of Electronics 2015年第4期24卷 807-812页

作者： men Yubo ZHANG Guoyin men Chaoguang li Xiang MA Ning Collage of Computer Science and Technology Harbin Engineering University Harbin Commercial University

A four-moded Census transform stereo matching algorithm using bidirectional constraint dynamic programming and relative confidence plane fitting is proposed to solve the problems of matching quality. Using the four-moded Census transform which adds a restrictive condition replaces traditional Census transform to improve matching accuracy and mean value of all pixels intensity replaces the center pixel intensity in the Census window to solve the problem of the center pixel distortion effectively,a refined initial local matching cost can be obtained. During the disparity optimization, the difficulty of disparity computation in textureless areas is overcome by the estimated condition and defined relative confident pixels. Experiment results show that a better dense matching map can be obtained by the proposed algorithm.

关键词： Stereo matching Disparity estimation Census transform Plane fitting

A Sub-pixel Disparity Refinement Algorithm Based on Lagrange Interpolation

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Chinese Journal of Electronics 2017年第4期26卷 784-789页

作者： men Yubo ZHANG Guoyin men Chaoguang li Xiang MA Ning College of Computer Science and Technology Harbin Engineering University Harbin Normal University

A sub-pixel disparity refinement algorithm based on Lagrange interpolation is proposed to calculate the sub-pixel disparity and the elevation of the target construction on the remote sensing image. The accurate integer matching feature points are obtained by improved affine scale invariant feature transform. A series of interpolation samples can be estimated through the three times magnification results of each feature matching point and its close neighbor pixels. The final sub-pixel deviation can be calculated by the interpolation samples. Experiment results show that a more accurate elevation information can be obtained on the remote sensing image with corrective epipolar line, and an accurate sub-pixel disparity result can be estimated without the epipolar line constraint as well.

关键词： Computer vision Remote sensing image processing Sub-pixel disparity Interpolation

Residue behaviors and dietary risk of cyazofamid in turnip,onion and romaine lettuce assessed by a QuEChERS-LC-MS/MS methods

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Food Science and Human Wellness 2023年第5期12卷 1538-1544页

作者： Ruijuan li Xue men Rumei li Tongjin liu Hui liang Feng fang Dongxiao Sun-Waterhouse Yongli Wang Institute of Plant Protection Shandong Academy of Agricultural SciencesJinan 250100China College of Food Science and Engineering Shandong Agricultural UniversityTaian 271018China School of Chemical Sciences The University of AucklandPrivate Bag 92019Auckland 1142New Zealand

In this study, the dissipation, terminal residues and dietary risk of the cyazofamid residue in three globally consumed minor crops, turnip(Brassica rapa L.), onion(Allium cepa L.)and romaine lettuce(Lactuca sativa L.)were assessed by supervised field trials at 6 locations of China in 2020. A reliable QuEChERS-LC-MS/MS method was developed for simultaneous analysis of cyazofamid and its primary metabolite, 4-chloro-5-p-tolylimidazole-2-carbonitrile(CCIM). The average recoveries of cyazofamid and CCIM in turnip, onion and romaine lettuce were 79%–97% and 77%–99%, respectively. The half-lives of cyazofamid in these crops were 5.7–6.5, 5.3–8.7 and 5.8–6.5 days in turnip, onion and romaine lettuce, respectively, with the final cyazofamid residues at harvest all lower than limit of quantitation(LOQ, 0.01 mg/kg). The turnip roots, onion bulbs and romaine lettuce leaves grown in China under Good Agricultural Practices conditions and harvested 10, 14 and 5 days, respectively, after the cyazofamid SC(100 g/L)application, would be reasonably safe for consumption by the general population. The maximum residue limit(MRL)values of cyazofamid could be tentatively set as 10 mg/kg for turnip leaves, 0.3 mg/kg for turnip roots, 0.05 mg/kg for onion bulbs, and 10 mg/kg for romaine lettuce leaves.

关键词： Cyazofamid residue Minor crops Maximum residue limit Dissipation Dietary risk assessment

Peripheral blood RNA biomarkers can predict lesion severity in degenerative cervical myelopathy

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Neural Regeneration Research 2025年第6期20卷 1764-1775页

作者： Zhenzhong Zheng Jialin Chen Jinghong Xu Bin Jiang Lei li Yawei li Yuliang Dai Bing Wang Department of Spine Surgery The Second Xiangya Hospital of Central South UniversityChangshaHunan ProvinceChina

Degenerative cervical myelopathy is a common cause of spinal cord injury,with longer symptom duration and higher myelopathy severity indicating a worse *** numerous studies have investigated serological biomarkers for acute spinal cord injury,few studies have explored such biomarkers for diagnosing degenerative cervical *** study involved 30 patients with degenerative cervical myelopathy(51.3±7.3 years old,12 women and 18 men),seven healthy controls(25.7±1.7 years old,one woman and six men),and nine patients with cervical spondylotic radiculopathy(51.9±8.6 years old,three women and six men).Analysis of blood samples from the three groups showed clear differences in transcriptomic *** analysis identified 128 differentially expressed genes that were enriched in patients with neurological *** least absolute shrinkage and selection operator analysis,we constructed a five-gene model(TBCD,TPM2,PNKD,EIF4G2,and AP5Z1)to diagnose degenerative cervical myelopathy with an accuracy of 93.5%.One-gene models(TCAP and SDHA)identified mild and severe degenerative cervical myelopathy with accuracies of 83.3%and 76.7%,*** of two immune cell types(memory B cells and memory-activated CD4^(+)T cells)predicted levels of lesions in degenerative cervical myelopathy with 80%*** results suggest that peripheral blood RNA biomarkers could be used to predict lesion severity in degenerative cervical myelopathy.

关键词： biomarkers candidate genes degenerative cervical myelopathy gene expression analysis immune cell types neurological disabilities peripheral blood RNA profiles spinal cord injury

Visualized optical sensors based on two/three-dimensional photonic crystals for biochemicals

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Science Bulletin 2016年第17期61卷 1358-1371页

作者： Dandan men Dilong liu Yue li Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230026China

Responsive photonic crystals(RPCs) constructed by periodic two/three-dimensional(2D/3D) photonic crystals(PCs) and responsive-material hosts,are important visualized optical *** optical diffraction color can be tuned reversibly by external stimuli,such as pH,metal ions,biomolecules,vapors and solvents,hence leading to wide applications as visualized *** review introduces the recent progress of RPCs based on 2D/3D PCs for visual detection of chemical and biological analytes,including the preparation of 2D PCs,3D PCs films,3D PCs microbeads and their applications as visualized *** different cases of detecting various chemical and biological analytes by naked eyes are *** is given to the description of their respective sensing mechanisms with the different systems for chemical and biological *** with 3D RPCs sensors,2D RPCs sensors have shorter response time,better stabilization and higher production efficiency,however,the diffraction intensity of 2D RPCs based on monolayered 2D polystyrene(PS) microsphere array are weak.2D RPCs sensors based on 2D Au nanosphere can significantly improve the diffraction intensity compared with traditional 2D RPCs sensors based on monolayered PS microsphere *** much higher scattering cross section of Au nanosphere leads to 2D Au nanosphere array with ultrahigh optical diffraction intensity,which are highly helpful for their practical application as visual sensors and further quantitative detection by monitoring the diffraction peak position and intensity.

关键词： Optical sensor Photonic crystal Biochemicals

Friction and wear behaviors of MoS2-multi-walled-carbonnanotube hybrid reinforced polyurethane composite coating

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Friction 2019年第4期7卷 316-326页

作者： Zhaozhu ZHANG Mingming YANG Junya YUAN fang GUO Xuehu men State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China University of Chinese Academy of Sciences Beijing100039China School of Physical Science and Technology Lanzhou UniversityLanzhou730000China

MoS2-multi-walled-carbon-nanotube(MWCNT)hybrids containing two-dimensional MoS2 and one-dimensional MWCNTs were synthesized through a one-step hydrothermal reaction.X-ray-diffraction and transmission-electron-microscopy results demonstrated that MoS2 nanosheets were successfully synthesized,and uniformly anchored on the MWCNTs’***,the effects of the Mo S2-MWCNT hybrids on the tribological performances of polyurethane composite coatings were investigated using a UMT-2MT *** and wear test results revealed that the friction coefficient and wear rate of a 3 wt%Mo S2-MWCNT-1 filled polyurethane composite coating were reduced by 25.6% and 65.5%,*** outstanding tribological performance of the MoS2-MWCNT-1 reinforced polyurethane composite coating was attributed to the excellent load-carrying capacity of the MWCNTs and good lubricant ability of *** surface morphologies of the worn surfaces and counterpart ball surfaces were investigated to reveal the wear mechanisms.

关键词： adhesion coating friction wear polyurethane

Landscape genetic analyses reveal host association of mitochondrial haplotypes in the Asian corn borer,Ostrinia furnacalis

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Insect Science 2021年第4期28卷 1169-1178页

作者： Zhaoke Dong Chao li Qingqing Zhang lili li Zengbin Lu fang Ouyang Yingying Song Yi Yu Xingyuan men Institute of Plant Protection Shandong Academy of Agricultural ScienceJinanChina Key Laboratory of Integrated Crop Pest Management of Shandong Province College of Plant Health and MedicineQingdao Agricultural UniversityQingdaoChina Maize Research Institute Shandong Academy of Agricultural ScienceJinanChina State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijingChina

Crop expansion often leads to high pest *** pests may have fitness trade-offs related to host use,and some host-associated genotypes may benefit and increase in ***,evidence concerning the effect of host availability on spatial distribution and frequency of mitochondrial haplotypes is *** studied genetic variation of the Asian corn borer,Ostrinia furnacalis(Guenée),across a large area during 2 years(2016 and 2017).Mitochondrial sequence data were obtained from 530 individuals collected from 79 locations in Shandong Province,*** total,155 haplotypes were found based on the combined cytochrome oxidase subunit 1(COI)and COII *** haplotypes(H2,H12,and H23)were dominant,whereas most of the other haplotypes occurred in low frequency.A haplotype network showed that the 155 haplotypes can be grouped into three *** clusters seemed to be randomly *** frequency of H12(in Cluster 1)was positively correlated with maize crop proportion,but negatively correlated with other crops(primarily vegetables,oilseed crops,and cotton)at all spatial scales(1-,3-,and 5-km radius).Cluster 2 had haplotype H23,and this cluster was negatively correlated with semi-natural *** 3 had no dominant haplotype and was not affected by landscape *** conclude that H12 may be a maize-associated *** study is needed to verify the possibility that the carriers of this haplotype may possess some fitness *** study highlights the importance of host availability in *** haplotype distribution and frequency.

关键词： agricultural landscape corn pest haplotype network host-associated haplotype mitochondrial sequence

Influence of amplified spontaneous emission and fluorescence of β-carotene on stimulated Raman scattering of carbon disulfide

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Science China(Physics,Mechanics & Astronomy) 2009年第4期52卷 529-533页

作者： men ZhiWei SUN XiuPing fang WenHui li ZuoWei CAO Biao GAO ShuQin LU GuoHui Department of Physics Jilin UniversityChangchun 130021China Department of Physics Changchun University of Science and TechnologyChangchun 130022China

β-carotene with double fluorescence characteristics and large third-order optical nonlinearities,which is dissolved in the carbon disulfide(CS2) as the core medium of a liquid core optical fiber(LCOF),is applied in the study of the CS2 stimulated Raman scattering(SRS). The results of this study show that when the concentrations of solution are more than 3.72×10-7 mol/L,the amplified spontaneous emis-sion(ASE) of β-carotene is the main factor influencing the threshold and intensity of Stokes lines; when the concentrations of solution are lower than 3.72×10-7 mol/L,the ASE disappears and the fluorescence plays the key role:The high-order Stokes lines may be observed at very low input-laser power,and the Stokes thresholds decrease as the solution concentration increases. The result may be widely used in the study of broadband stimulated radiation laser and seeding laser.

关键词： β-carotene ASE fluorescence SRS LCOF