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单跨铁路跨线桥预应力简支空心桥面板荷载试验

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山西建筑 2024年第3期50卷 150-154页

作者：陈文举陈自焱王龙胜苏宏军谢万友胡雷中铁二局集团有限公司四川成都610000 重庆市荣昌区交通工程建设中心重庆402460

桥梁面板直接承受反复车轮荷载,活载效应大,疲劳破坏风险大,已成为桥梁工程领域不可忽视的问题。单跨铁路跨线桥预应力简支空心桥面板较为少见,有较高的研究价值,以某现状单跨铁路跨线桥为工程背景,利用三轴车辆进行静载、动载试验,测... 详细信息

桥梁面板直接承受反复车轮荷载,活载效应大,疲劳破坏风险大,已成为桥梁工程领域不可忽视的问题。单跨铁路跨线桥预应力简支空心桥面板较为少见,有较高的研究价值,以某现状单跨铁路跨线桥为工程背景,利用三轴车辆进行静载、动载试验,测量桥梁跨中截面的挠度和应变。结果表明:桥跨结构强度满足要求;卸载后相对残余变形在20%范围内,桥跨结构处于弹性工作状态。

关键词：桥梁工程桥梁荷载试验单跨铁路跨线桥预应力简支空心桥面板

重污染天气特征分析及气温精细化预报方法研究

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环境科学与管理 2024年第8期49卷 140-144页

作者：严天凯庞晶陈紫嫣吴建磊王艺霖武汉市气象台湖北武汉430000 江夏区气象台湖北武汉430000 黄冈市气象台湖北黄冈438000 武汉市公共气象服务中心湖北武汉430000

重污染天气通常涉及颗粒物、臭氧等污染物,相互作用的复杂性使得预测重污染天气的气温的难度增加。为此,提出重污染天气特征分析及气温精细化预报方法。构建污染物扩散方程,分析空气污染物日变化、月变化、年变化特征;利用灰色关联分析... 详细信息

重污染天气通常涉及颗粒物、臭氧等污染物,相互作用的复杂性使得预测重污染天气的气温的难度增加。为此,提出重污染天气特征分析及气温精细化预报方法。构建污染物扩散方程,分析空气污染物日变化、月变化、年变化特征;利用灰色关联分析方法分析重污染天气污染浓度与气象因子的相关性,通过降尺度技术实现气温精细化预报。实验结果表明,重污染天气的湿度、风速、降水量对污染物浓度的升降起决定性作用,验证了所提方法的天气特征分析准确性高,气温预报的效果好。

关键词：重污染天气特征 PM_(2.5) 臭氧灰色关联分析方法降尺度技术

Geographical patterns and determinants of insect biodiversity in China

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Science China(Life Sciences) 2024年第6期67卷 1255-1265页

作者： Huizhong Fan Tongyi Liu Youhua chen ziyan Liao Jun chen Yibo Hu Gexia Qiao Fuwen Wei CAS Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&China-Croatia“Belt and Road”Joint Laboratory on Biodiversity and Ecosystem Services Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China Jiangxi Provincial Key Laboratory of Conservation Biology College of ForestryJiangxi Agricultural UniversityNanchang 330045China University of Chinese Academy of Sciences Beijing 100049China

Insects play important roles in the maintenance of ecosystem functioning and the provision of livelihoods for millions of ***,compared with terrestrial vertebrates and angiosperms,such as the giant panda,crested ibis,and the metasequoia,insect conservation has not attracted enough attention,and a basic understanding of the geographical biodiversity patterns for major components of insects in China is ***,we investigated the geographical distribution of insect biodiversity across multiple dimensions(taxonomic,genetic,and phylogenetic diversity)based on the spatial distribution and molecular DNA sequencing data of *** analysis included 18 orders,360 families,5,275 genera,and 14,115 species of *** results revealed that Southwestern and Southeastern China harbored higher insect biodiversity and numerous older lineages,representing a museum,whereas regions located in Northwestern China harbored lower insect biodiversity and younger lineages,serving as an evolutionary *** also observed that mean annual temperature and precipitation had significantly positive effects,whereas altitude had significantly negative effects on insect biodiversity in most ***,cultivated vegetation harbored the highest insect taxonomic and phylogenetic diversity,and needleleaf and broadleaf mixed forests harbored the highest insect genetic *** results indicated that human activities may positively contribute to insect spatial diversity on a regional *** study fills a knowledge gap in insect spatial diversity in *** findings could help guide national-level conservation plans and the post-2020 biodiversity conservation framework.

关键词： insect spatial patterns multiple dimensions driving factors vegetation types

Analysis of emotional integration in Photojournalism

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Analysis of emotional integration in Photojournalism

BURST-LDA: A NEW TOPIC MODEL FOR DETECTING BURSTY TOPICS FROM STREAM TEXT

作者： ziyan chen Fine Arts School Hangzhou Normal University

News photography is a news photography that covers social features and social dynamics, analyzes and studies social issues, and explores social psychology. Integrating emotional factors into photography is an important requirement for contemporary news photography. This article analyzes the significance of emotional factors for news photography, and puts forward the emotional factors and requirements and specific methods for incorporating them into news photography.

关键词： News photography Fusion Emotional factors

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Journal of Electronics(China) 2014年第6期31卷 565-575页

作者： Qi Xiang Huang Yu chen ziyan Liu Xiaoyan Tian Jing Huang Tinglei Wang Hongqi Key Laboratory of Technology in Geo-spatial Information Processing and Application System Institute of Electronics Chinese Academy of Sciences University of Chinese Academy of Sciences

Topic models such as Latent Dirichlet Allocation(LDA) have been successfully applied to many text mining tasks for extracting topics embedded in corpora. However, existing topic models generally cannot discover bursty topics that experience a sudden increase during a period of time. In this paper, we propose a new topic model named Burst-LDA, which simultaneously discovers topics and reveals their burstiness through explicitly modeling each topic's burst states with a first order Markov chain and using the chain to generate the topic proportion of documents in a Logistic Normal fashion. A Gibbs sampling algorithm is developed for the posterior inference of the proposed model. Experimental results on a news data set show our model can efficiently discover bursty topics, outperforming the state-of-the-art method.

关键词： Text mining Burst detection Topic model Graphical model Bayesian inference

High Density 3D Carbon Tube Nanoarray Electrode Boosting the Capacitance of Filter Capacitor

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Nano-Micro Letters 2024年第11期16卷 242-254页

作者： Gan chen Fangming Han Huachun Ma Pei Li ziyan Zhou Pengxiang Wang Xiaoyan Li Guowen Meng Bingqing Wei Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and NanotechnologyInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031People’s Republic of China Department of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China Department of Mechanical Engineering University of DelawareNewarkDE 19716USA Mechano‑X Institute Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084People’s Republic of China

Electric double-layer capacitors(EDLCs)with fast frequency response are regarded as small-scale alternatives to the commercial bulky aluminum electrolytic *** carbon-based nanoarray electrodes with precise alignment and smooth ion channels is crucial for enhancing EDLCs’***,controlling the density of macropore-dominated nanoarray electrodes poses challenges in boosting the capacitance of line-filtering ***,a simple technique to finely adjust the vertical-pore diameter and inter-spacing in three-dimensional nanoporous anodic aluminum oxide(3D-AAO)template is achieved,and 3D compactly arranged carbon tube(3D-CACT)nanoarrays are created as electrodes for symmetrical EDLCs using nanoporous 3D-AAO template-assisted chemical vapor deposition of *** 3D-CACT electrodes demonstrate a high surface area of 253.0 m^(2) g^(−1),a D/G band intensity ratio of 0.94,and a C/O atomic ratio of *** a result,the high-density 3D-CT nanoarray-based sandwich-type EDLCs demonstrate a record high specific areal capacitance of 3.23 mF cm^(-2) at 120 Hz and exceptional fast frequency response due to the vertically aligned and highly ordered nanoarray of closely packed CT *** 3D-CT nanoarray electrode-based EDLCs could serve as line filters in integrated circuits,aiding power system miniaturization.

关键词： Compactly arranged Three-dimensional carbon tube nanoarray Dimensional carbon tube nanoarray Fast frequency response Electric double-layer capacitors Layer capacitors AC line-filtering Filtering

转基因玉米MON87411实时荧光PCR定性检测方法的建立及其标准化

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生物技术进展 2024年第2期14卷 257-262页

作者：李凌燕肖冰张旭冬张华陈子言王颢潜张秀杰陈红梁晋刚农业农村部科技发展中心北京100176 北京农业职业学院食品与生物工程学院北京102442 中国农业科学院农业资源与农业区划研究所北京100081

转基因玉米MON87411是孟山都远东有限公司研发的抗虫耐除草剂玉米转化体,该转化体已获得进口加工原料的农业转基因生物安全证书。以转基因玉米MON87411品系特异性序列为靶标设计引物和探针,经特异性测试、体系优化、灵敏度测试及检出限... 详细信息

转基因玉米MON87411是孟山都远东有限公司研发的抗虫耐除草剂玉米转化体,该转化体已获得进口加工原料的农业转基因生物安全证书。以转基因玉米MON87411品系特异性序列为靶标设计引物和探针,经特异性测试、体系优化、灵敏度测试及检出限测试,建立了转基因玉米MON87411的实时荧光PCR定性检测方法。结果表明,该方法能检测出转基因玉米MON87411的转化体成分,检出限(limit of detection,LOD)可达0.05%,具有稳定性好、特异性强、灵敏度高的特点。国内8家转基因生物安全检测机构对本方法进行了特异性测试、检出限测试和再现性测试,循环验证报告显示该方法符合国家标准方法的各项要求,可在检测行业推广应用。研究建立的方法可为我国对转基因玉米MON87411品系的安全监管提供有效的技术支撑。

关键词：抗虫耐除草剂玉米 MON87411 实时荧光PCR 安全监管标准化

生物制剂在慢性自发性荨麻疹治疗中的应用进展

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皮肤性病诊疗学杂志 2024年第2期31卷 136-141页

作者：黄雪梅欧珊珊陈教全邹荟陈紫嫣吴伟鸿吴慧李润祥朱慧兰广州市皮肤病防治所广东广州510095 广州医科大学广东广州511436

慢性自发性荨麻疹(CSU)是一种临床常见的免疫反应性皮肤病,其发病的关键效应细胞是肥大细胞。随着近年来对CSU发病机制的不断认识,不少新型生物制剂被应用于CSU患者的治疗。生物制剂可通过靶向作用于肥大细胞的活化过程的不同阶段,阻断... 详细信息

慢性自发性荨麻疹(CSU)是一种临床常见的免疫反应性皮肤病,其发病的关键效应细胞是肥大细胞。随着近年来对CSU发病机制的不断认识,不少新型生物制剂被应用于CSU患者的治疗。生物制剂可通过靶向作用于肥大细胞的活化过程的不同阶段,阻断肥大细胞的活化、脱颗粒,从而有效治疗CSU;根据作用靶点和作用机制,可分为抑制肥大细胞激活、抑制胞内信号转导、激活抑制性受体的药物。本文对生物制剂在CSU治疗中的应用展开综述。

关键词：慢性自发性荨麻疹生物制剂治疗

Oroxyloside protects against dextran sulfate sodium-induced colitis by inhibiting ER stress via PPARγ activation

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Chinese Journal of Natural Medicines 2024年第4期22卷 307-317页

作者： TAO Lei DOU Renjie chen Xueming CAO Yu DAI Zhen HU ziyan MA Zhi GE Xiaoming ZHANG Ling WANG Xiaoping Nanjing Institute for Food and Drug Control Nanjing 211198China State Key Laboratory of Natural Medicines School of Basic Medicine and Clinical PharmacyChina Pharmaceutical UniversityNanjing 211198China

Ulcerative colitis (UC), a prevalent form of inflammatory bowel disease (IBD), may result from immune system dysfunction, leading to the sustained overproduction of reactive oxygen species (ROS) and subsequent cellular oxidative stress damage. Recent studies have identified both peroxisome proliferator-activated receptor-γ (PPARγ) and endoplasmic reticulum (ER) stress as critical targets for the treatment of IBD. Oroxyloside (C22H20O11), derived from the root of Scutellaria baicalensis Georgi, has traditionally been used in treating inflammatory diseases. In this study, we investigated the molecular mechanisms by which oroxyloside mitigates dextran sulfate sodium (DSS)-induced colitis. We examined the effects of oroxyloside on ROS-mediated ER stress in colitis, including the protein expressions of GRP78, p-PERK, p-eIF2α, ATF4, and CHOP, which are associated with ER stress. The beneficial impact of oroxyloside was reversed by the PPARγ antagonist GW9662 (1 mg·kg^(−1), i.v.) in vivo. Furthermore, oroxyloside decreased pro-inflammatory cytokines and ROS production in both bone marrow-derived macrophages (BMDM) and the mouse macrophage cell line RAW 264.7. However, PPARγ siRNA transfection blocked the anti-inflammatory effect of oroxyloside and even abolished ROS generation and ER stress activation inhibited by oroxyloside in vitro. In conclusion, our study demonstrates that oroxyloside ameliorates DSS-induced colitis by inhibiting ER stress via PPARγ activation, suggesting that oroxyloside might be a promising effective agent for IBD.

关键词： Oroxyloside ER stress PPARγ Colitis