Search

提出了一种改进型四边连接的圆形压痕钢板剪力墙，基于数值方法评估了其滞回性能，并与传统平钢板剪力墙和开圆孔钢板剪力墙的滞回性能进行了对比分析。随后，系统研究了压痕孔径、压痕孔距、压痕深度、钢板厚度、钢材强度和压痕布置方式等参数对其滞回性能的影响。分析结果表明：压痕钢板剪力墙的抗侧刚度和水平承载力介于传统平钢板剪力墙与开圆孔钢板剪力墙之间，通过优化压痕设置可实现其抗侧刚度与抗剪承载力的合理匹配。钢板厚度和钢材强度对压痕钢板剪力墙力学性能影响显著，随着钢板厚度、钢材强度等级的增加，其水平承载力呈增大趋势；压痕孔径、压痕孔距和压痕深度对压痕钢板剪力墙力学性能有一定影响，随着压痕孔径的增加，其水平承载能力呈下降趋势；随着压痕孔距的增加，其水平承载力与抗侧刚度呈增大趋势；随着压痕深度的增加，其水平承载力、抗侧刚度均呈降低趋势，但其耗能能力呈增大趋势。压痕布置方式对压痕钢板剪力墙的滞回性能、抗侧刚度及水平承载力影响不明显。

为了扩大OEO（光电振荡器）的频率可调谐范围,利用Matlab软件仿真设计了一种基于Chirped PS-FBG（啁啾相移光纤光栅）的频率可调谐OEO。对PS-FBG（相移光纤光栅）的反射谱和基于PS-FBG的频率可调谐范围进行了理论和仿真研究,分析了Chirped PS-FBG的反射谱和基于Chirped PS-FBG的频率可调谐范围。仿真结果表明,通过对可调谐激光源的波长调节可实现频率可调,与PS-FBG相比,Chirped PS-FBG扩大了反射谱带宽及OEO的频率可调谐范围。

针对预应力钢柱基底含摩擦型消能装置的耐震性能进行研究,探讨初始钢绞线预应力与消能装置的影响。通过钢绞线施拉预应力接合钢柱与基础,用来提供钢柱自复位能力;消能装置采用摩擦型消能,提供柱构件与基础接合的滞回消能能力,因此柱构件在受震后拥有自复位与无残余变形特性。研究参数包含初始预应力大小、摩擦消能面积与摩擦型消能装置的位置。通过理论推导建立预应力与消能装置在钢柱与基础接合的性能模式,进而设计试件进行试验来验证其性能。试验结果表明,柱与基础接合面有开启与闭合的现象;提高摩擦型消能装置螺栓的预应力量,能有效提升滞回消能面积;提升初始钢绞线预应力量,能使滞回循环远离原点,确保自复位能力;消能装置安装在柱翼板处比安装在柱腹板处有较好的消能能力,且较为经济。预应力钢柱基底含摩擦型消能装置具有良好的自复位能力,具有滞回消能能力且柱构件无残余变形,理论分析亦能准确预测其性能。

为探讨焊接瑕疵对于钢骨箱型柱板破裂行为的影响,本文采有限元素分析,根据裂缝尖端开口位移、应力三轴度与破裂指数等行为指标,来评估柱板破裂的可能性。有限元素模型参数分析结果显示,侧垫板间隙与钢梁相对于电热熔渣焊道的偏心等参数对于箱型柱板破裂的影响较小;然而由于电热熔渣焊道的偏心,即使侧垫板与柱板间隙处的电热熔渣焊熔接线至内横隔板的一个较小的距离,也将产生较大的裂缝尖端开口位移、应力三轴度与破裂指数,因而可能造成柱板的破裂。

传统抗弯构架之梁柱接头梁腹板以螺栓接合而梁翼板以全渗透焊接于柱,在北岭及阪神地震的侵袭下,梁柱接头处发生严重脆性破坏。本研究针对钢梁连接H型钢柱之接头,以扩大接头处梁翼板宽度之改良方式,改善扇形开孔处与梁翼全渗透焊道之应力集中现象。藉由参数研究确立各设计参数,制作六组实尺寸试体进行试验。试验结果显示,扩翼式梁柱接头试体可降低梁柱接头处发生脆性破坏之可能,而皆可产生塑性铰,提供优良且稳定之弯矩强度及韧性能力。

相对于传统SRC梁接SRC柱的梁柱接头而言,本研究采用钢梁接SRC柱之接头型式,尝试利用SRC柱在劲度与抗压强度之优点,并避开SRC梁在施工上的不便,初步进行了两组大尺寸试体之反复载重试验,以探讨此种型式接头之耐震行为。实验结果显示,由于两组试体之钢梁与钢柱之弯矩强度比并未满足强柱弱梁的规定(但SRC柱整体之抗弯强度仍大于钢梁之强度),因此其反复载重位移曲线并不如满足强柱弱梁的纯钢构接头饱满,而在非弹性阶段出现较明显劲度衰减的现象;但由于SRC柱接头区的混凝土对钢柱提供了良好的围束,使得试体极限强度仍可稳定发展,且两支试体之最大层间变位角均超过5％弧度

扇形焊接开孔为进行梁翼板全渗透开槽焊接时所需之工作孔。然而,实尺寸梁柱接头试验证实,传统梁腹板锁螺栓及梁翼板全渗透焊接之钢构造梁柱接头,常于扇形开孔处发生突然性之脆性破坏。本研究采用非线性有限元素分析方法,探讨扇形焊接开孔于钢骨梁柱接头耐震行为上之影响,包括扇形开孔几何形状对接头区力学行为之影响。分析结果显示,平顺接至梁翼板之扇形开孔能将最大塑性应变之发生位置移离扇形开孔根部,减少因几何形状不连续所造成之应力集中现象,降低局部区域之韧性需求;无扇形开孔之梁柱接头可避免有扇形开孔之缺陷,大幅的改善梁柱接头之韧性行为。

Copyright of Chinese Journal of Immunology is the property of Medical Periodical Society of Jilin 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 Mining & Metallurgical Engineering is the property of Mining & Metallurgical Engineering 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.)

Copyright of Power Generation Technology is the property of Power Generation Technology 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.)

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics 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 Journal of Xi'an Jiaotong University is the property of Editorial Office of Journal of Xi'an Jiaotong University 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 evaluate the image quality of CT portal venography (CTPV) under low radiation dose conditions at 100 kVp using a second-generation dual-layer detector spectral CT (DLCT). Methods A total of 110 patients [54 men, 56 women, mean age: (57.47±15.07) years] underwent abdominal contrast-enhanced DLCT from May 2023 to March 2024. The patients were randomly divided into a control group (120 kVp, n=50) and a study group (100 kVp, n=60). The original CTPV data from the control group were reconstructed into conventional mixed-energy images (CI), while the data from the study group were reconstructed into CI and virtual monoenergetic images (VMI) at 40-80 keV intervals (10 keV steps). The CT values, standard deviation (SD), signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) of the main portal vein and its left and right branches were measured. Subjective image quality was assessed by two radiologists. Results The effective radiation dose (ED) for the study group [(1.92±0.21) mSv] was 52.59% lower than that of control group [(4.05±1.23) mSv]. The average CT values, SNR, and CNR of the portal vein and its branches in the 40, 50, and 60 keV VMIs of the study group were significantly higher than those in the CIs of both groups (all P<0.0001), with the highest SNR and CNR observed at 40 and 50 keV VMIs. There was no significant difference in the SNR and CNR between 40 and 50 keV VMIs (P<0.05). The SD of 40 and 50 keV VMIs in the study group was comparable to that of control (P>0.05) whereas the SD of 60-80 keV VMIs was significantly lower than that of control (P<0.05). Subjective image quality assessment showed that 50 keV VMI had the highest proportion of scores rated as 5 (best) at 75% with good interobserver agreement (all K>0.8). Conclusion Using 50 keV VMI with 100 kVp DLCT provides image quality that meets clinical diagnostic requirements while significantly reducing radiation dose compared to conventional images at 120 kVp. [ABSTRACT FROM AUTHOR]

Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) 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 Chinese Journal of Contemporary Pediatrics is the property of Xiangya Medical Periodical Press 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 Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica 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.)

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental 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 Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural 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 Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis 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.)

Copyright of Journal of Ordnance Equipment Engineering is the property of Chongqing University 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.)

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University 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.)

Copyright of China Sciencepaper is the property of China Sciencepaper 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 Science Technology & Engineering is the property of Chinese Society of Technology Economics 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 Science Technology & Engineering is the property of Chinese Society of Technology Economics 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 Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering 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.)

Copyright of Journal of National University of Defense Technology / Guofang Keji Daxue Xuebao is the property of NUDT Press 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 Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) 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 Journal of Dalian Ocean University is the property of Journal of Dalian Ocean University 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.)

Based on the nighttime lights data of Jiangxi from 2005 to 2020 processed by the autoencoder, the spatial simulation of anthropogenic heat emissions in a long time series was realized, and the temporal and spatial variation characteristics of anthropogenic heat emissions in Jiangxi were analyzed. The correlation between anthropogenic heat emission data and nighttime land surface temperature was compared. The results show that: 1) The anthropogenic heat emission in Jiangxi shows a significant increase trend, the area of anthropogenic heat emission is increasing, and the center of gravity of anthropogenic heat emission has been moving to the southeast of Jiangxi in the past 16 years. 2) 26. 27% of the region&'s nighttime land surface temperature is increasing in Jiangxi, the nighttime land surface temperature increases obviously in winter, the area of warming and the growth trend of nighttime land surface temperature are the largest. 3) There is a significant positive correlation between anthropogenic heat emission intensity and nighttime land surface temperature, which is manifested as significantly higher nighttime land surface temperature in areas with high heat emissions during the year. The interannual variation shows that the variation trend of nighttime land surface temperature and the variation trend of heat emission are positively correlated. [ABSTRACT FROM AUTHOR]

Most cancers occurring in children and adolescents may be cured by surgery, chemotherapy or radiotherapy. Fertility is probably impaired due to a removal of reproductive organs or toxic/side effects of anti-cancer radiochemotherapy. In recent years, emerging assisted reproductive technologies offer new possibilities for managing impaired fertility. This review summarized the related medical issues and ethical considerations for fertility preservation in pediatric and adolescent cancer patients. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Clinical Pediatric Surgery is the property of Journal of Clinical Pediatric Surgery 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.)

Copyright of Southern Energy Construction is the property of Southern Energy Construction 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.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering 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.)

Mini-invasive surgery for pectus excavatum (PE) has been widely applied for over three decades. Overall safety, technical feasibility and excellent long-term outcomes have been generally accepted. NUSS surgery is not only a mini-invasive surgical option for PE, but also a mini-invasive concept of internal fixation without osteotomy. It has become a standard procedure for chest wall deformities. This review summarized the latest mini-invasive advances in the field of chest wall orthopedics, examined the breadth of surgical techniques, safety and factors related to surgical outcomes. And recommendations were proposed for pediatric thoracic surgeons in learning to apply mini-invasive surgical techniques for chest wall deformities. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Clinical Pediatric Surgery is the property of Journal of Clinical Pediatric Surgery 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.)

In this study, the preparation method of acetanilide, which is commonly taught in current undergraduate experimental courses, is improved. While acetic acid and aniline were used as starting materials in the improved method, zinc powder was replaced with stannous chloride (which is listed as an easy-to-make tube explosion product) as a reducing agent to prevent aniline from being oxidized. At the same time, p-toluene sulfonic acid was added as a catalyst. A fixed bed dehydration reflux device was used instead of the classical fractionation device, and a packed rectification column was used as the fixed bed. The column was filled with glass spring packing, a 4A molecular sieve and color-changing silica gel from bottom to top in turn. During the reaction, distilled water and acetic acid were fractionated by the glass spring packing, acetic acid was refluxed to the reaction flask, and water was absorbed by the 4A molecular sieve and color-changing silica gel. After absorbing water, the color of the silica gel changed from orange to green, which is a clear indication of the reaction process. The improved experiment does not require control reagents, the reaction time is shortened, and the phenomenon is rich, making it more suitable for undergraduate teaching. In addition, two extended experiments were designed in this study, which can be selected according to the needs of teaching. One is to prepare phenyl 4-acetylaminoacetate from acetanilide; the second is to determine the unreacted aniline content in the waste liquid by constant pH titration. This modified experimental procedure employs extraction, column chromatography, titration, and data processing and analysis, which can effectively improve the comprehensive experimental ability of the students. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board 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 Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica 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.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Engineering Management & Technology Discussion is the property of Omniscient Pte. Ltd. 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 Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica 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.)

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.)

Copyright of Journal of Fuzhou University is the property of Journal of Fuzhou University, 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.)

Copyright of Journal of Modern Laboratory Medicine is the property of Journal of Modern Laboratory Medicine 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.)