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为研究常幅疲劳荷载特性对高强度螺栓疲劳裂纹扩展的影响，针对钢结构端板连接用8.8级M24高强度螺栓在不同应力比/应力幅作用下常幅疲劳试验所得到的24个试件断口形貌进行定量分析，并采用ABAQUS软件数值模拟高强度螺栓应力集中情况，探讨含初始裂纹高强度螺栓裂纹尖端应力强度因子与荷载特性、预制裂纹形状之间的关系。结果表明：在轴向受拉疲劳荷载作用下，螺母与螺栓啮合第1圈螺纹处为疲劳断裂最不利位置；试件断口稳定扩展区面积与应力比/应力幅呈负相关，快速扩展区面积与应力比/应力幅呈正相关；裂纹尖端应力强度因子随应力比/应力幅的增大而增大；预制半椭圆形裂纹短/长轴之比（a/c）越大，应力强度因子扩展有限元（XFEM）解与解析解误差越大。

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Copyright of Journal of Ballistics / Dandao Xuebao is the property of Journal of Ballistics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers Edition and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Using SnCl2 • 2H2O and SnCL • 5H2O as tin source and polyvinylpyrrolidone (PVP) as polymer matrix, fibril was prepared by using simple and controllable electrostatic spinning technology, and SnO2 nanofibers were obtained after calcination. Scanning electron microscope (SEM), X-ray diffractometer (XRD) etc. were used to investigate the effect of PVP molecular weight and different tin sources on the morphological properties of SnO2 nanofibers, and the specific surface area and gas-sensing characteristics of SnO2 nanofibers were tested. The results show that the fiber precursor prepared by electrospinning can remove the polymer matrix and solvent after ca lei nation, and obtain pure tetragonal rutile SnO2 nanofibers, which show the characteristics of large specific surface area, high sensitivity and fast response speed. When PVP-K30 is used as high molecular matrix and SnCL4 • 5H2O is used as tin source, the prepared SnO2 nanofibers have uniform diameter, clear fiber, good orientation and better gas sensing characteristics. [ABSTRACT FROM AUTHOR]

Copyright of China Brewing is the property of China Brewing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ag-SnO2 composite powder was prepared by sol-gel method using Sn powder and AgNO3 as raw materials, citric acid as reductant and complexing agent and soluble starch aqueous solution as template. Subsequently, Ag-SnO2 electrical contact alloys were prepared using Ag-SnO2 composite powder as material by powder metallurgy. The obtained Ag-SnO2 composite powder and alloys were characterized through XRD and SEM. The decomposition process of starch paper precursor was analyzed via TG-DSC. Meanwhile, the microstructure and properties of Ag-SnO2 electrical contact alloys with different citric acid contents were also investigated. The results show that Ag-SnO2 electrical contact alloy is in good agreement with the tetragonal rutile SnO2 and face-centered cubic Ag, and the template has been removed without any impurities. SnO2 powder was uniformly dispersed in Ag matrix with the help of starch template. With the increasing of citric acidcontents, the physical properties of Ag-SnO2 electric contact alloy increased at first and then decreased. And the physical properties of Ag-SnO2 electrical contact alloy are the best when the ratio of n(C6H8O7):n(Ag++Sn4+)is 3:1. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Northeastern University (Natural Science) is the property of Dongbei Daxue Xuebao and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Harbin University of Science & Technology is the property of Journal of Harbin University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To screen the microRNA( miRNA) with potential biomarker characteristics in prostate cancer tissues, and to analyze the biological functions and signal pathways of its target genes. Methods From cancer and cancer genome program( TCGA) database, we downloaded the prostate cancer dataset, and analyzed the expression of miRNA in the prostate tissues and the adjacent carcinoma tissues, and screened out the differentially expressed miRNAs; KaplanMeier survival curves were used to analyze the survival of patients with prostate cancer, and miRNAs with potential biomarker characteristics( high expression and poor prognosis) were screened out. Target genes with potential biomarker characteristics were predicted by bioinformatics online website, and gene ontology( GO) enrichment analysis and Kyoto gene and genome encyclopedia( KEGG) pathway enrichment analysis were conducted to analyze the biological functions and tumorrelated pathways of target genes with potential biomarker characteristics. Results A total of 159 differentially expressed miRNAs were found in the prostate cancer tissues and adjacent tissues, among which, 59 were down-regulated and 100 were up-regulated. Survival analysis revealed poor prognosis in pancreatic cancer patients with high miR-17 expression.The relative expression levels of miR-17 in the prostate cancer tissues and adjacent tissues were 3 852. 66 ± 1800. 41 and 1581. 22 ± 391. 71, respectively. The miR-17 had a total of 138 target genes, which were mainly involved in the biological processes such as transcriptional DNA template, protein phosphorylation, methylcytosine catabolism, positive regulation of apoptosis, transmembrane transport of sodium ions, and cytokinesis; the main molecular functions included their binding to protein kinase, nucleic acid, metal ion, calcium ion and protein. The signaling pathways related to miR-17 target genes included 13 estrogen signaling pathway, such as c AMP signaling pathway, chemokine signaling pathway, HIF-1 signaling pathway and cancer proteoglycan signaling pathway, and so on. Conclusions The miR-17 can be used as a potential biomarker for the occurrence and prognosis of prostate cancer. [ABSTRACT FROM AUTHOR]