检索结果-南通市图书馆

Science China(Technological Sciences) 2003年第3期46卷 309-317页

作者：刘智深吴东张凯临刘金涛 Johnathan W.Hair chiao-yao she Key Laboratory of Ocean Remote Sensing Ministry of Education of ChinaOcean University of China Atmospheric Sciences NASA Langley Research Center Hampton Physics Department Colorado State UniversityFort Collins

A mobile incoherent Doppler lidar system has been experimentally demonstrated to be able to transmit reliable single frequency operation laser pulse, even after truck transit and in very high vibration environments. The linewidth of the injection-seeded pulse Nd:YAG laser can be measured by means of an I2 molecular filter. And, lidar validation experiments demonstrated the feasibility and capability of measuring wind field by the Mie-Rayleigh Doppler wind lidar. The un-certainty of measured wind speed is 0.985m/s in the altitude range from 2 to 4 km.

关键词： mobile Doppler wind lidar, iodine-vapor discriminator.

The Ca^(2+)/CaN/ACC and cAMP/PKA/HK signal pathways are required for PBAN-mediated sex pheromone biosynthesis in Conogethes punctiferalis

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第8期23卷 2735-2751页

作者： yao Zhang Zelong she Ruolan He Shuangyan yao Xiang Li Xiaoguang Liu Xinming Yin Jizhen Wei Mengfang Du Shiheng An State Key Laboratory of Wheat and Maize Crop Science/Henan International Laboratory for Green Pest Control/College of Plant Protection Henan Agricultural UniversityZhengzhou 450046China

Conogethes punctiferalis is a crop and fruit pest that has caused serious economic losses to agricultural *** pest relies heavily on its sex pheromone to ensure sexual encounters and subsequent mating ***,the molecular mechanism underlying sex pheromone biosynthesis in this species remains *** present study investigated the detailed mechanism underlying PBAN-regulated sex pheromone biosynthesis in *** by transcriptome sequencing of the *** pheromone glands(PGs)and subsequent functional identification of the target *** results showed that female mating started from the first scotophase,and peaked at the second to fifth scotophases in accordance with the release of sex *** regulated sex pheromone biosynthesis by employing Ca^(2+)and cAMP as secondary messengers,as demonstrated by RNA interference(RNAi),pharmacological inhibitors,and behavioral *** investigation revealed that calcineurin(CaN)and acetyl-CoA carboxylase(ACC)were activated by PBAN/Ca^(2+)signaling,and the RNAimediated knockdown of CaN and ACC transcripts significantly reduced sex pheromone production,ultimately leading to a significantly reduced ability of females to attract ***,hexokinase(HK)was found to regulate sex pheromone biosynthesis in response to the PBAN/cAMP/PKA signaling pathway,as demonstrated by RNAi,enzyme activity,and pharmacological inhibitor ***,Far2 and Desaturase1 were found to participate in PBAN-regulated sex pheromone ***,our findings revealed that PBAN regulates sex pheromone biosynthesis through the PBANR/Ca^(2+)/CaN/ACC and PBANR/cAMP/PKA/HK pathways in ***,which enriches our comprehension of the details of sex pheromone biosynthesis in moths.

关键词： Conogethes punctiferalis sex pheromone cAMP/PKA calcineurin acetyl-CoA carboxylase hexokinase

Influence of El Nio-Southern Oscillation in the mesosphere

在线全文

学校读者我要写书评

暂无评论

Influence of El Nio-Southern Oscillation in the mesosphere

Construction of wavelength-tunable DSE quinoline salt derivatives by regulating the hybridization form of the nitrogen atom and intramolecular torsion angle

中国空间科学学会空间物理学专业委员会第十五届全国日地空间物理学研讨会

作者： Tao Li Natalia Calvo Jia Yue Xiankang Dou J.M.Russell Ⅲ M.G.Mlynczak chiao-yao she Xianghui Xue CAS key laboratory of Geospace Enviroment Department of Geophysics and Planetary ScienceUniversity of Science and Technology of China Atmospheric Chemistry Division and Advance Study Program National Center for Atmospheric ResearchBoulderColoradoUSA Currently at Dpto.Fisica de la Tierra Ⅱ Universidad Complutense de MadridSpain Center for Atmospheric Sciences Hampton UniversityHamptonVirginiaUSA NASA Langley Research Center HamptonVirginiaUSA Department of Physics Colorado State UniversityFort CollinsColoradoUSA

Using the middle atmosphere temperature datasets,observed by the Sounding of the Atmosphere using Broadband Emission Radiometry(SABER)between 2002 and 2012,and simulated by the Whole Atmospheric Community Climate Model version 3.5(WACCM3.5)between 1953 and 2005,we studied the influence of the El Nio-Southern Oscillation(ENSO)on the middle atmosphere temperature during the Northern Hemisphere *** the first time,a significant winter temperature response to ENSO in the middle mesosphere is observed,with an anomalous warming of.0K/MEI(Multivariate ENSO Index)over the tropics and anomalous cooling of2.0 K/MEI over the Northern Hemisphere middle *** observed temperature responses to ENSO in the stratosphere are opposite to those in the mesosphere,in agreement with previous *** temperature responses to ENSO observed by SABER show remarkably similar patterns as those simulated by WACCM3.5 *** analysis of WACCM residual mean meridional circulation response to ENSO reveals a significant downwelling in the tropical mesosphere and upwelling in the mid and high latitudes during the warm ENSO event,which is driven by the anomalous eastward wave forcing contributed from the combination of planetary wave EP flux divergence and gravity wave drag in the mesospheric middle latitudes.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第10期35卷 341-346页

作者： Kuan Deng Fei Yang Zhi-Qi Cheng Bi-Wen Ren Hua Liu Jiao Chen Meng-yao she Le Yu Xiao-Gang Liu Hai-Tao Feng Jian-Li Li Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education Shaanxi Key Laboratory for Carbon Neutral Technology College of Chemistry & Materials Science Northwest University Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of Education Biomedicine Key Laboratory of Shaanxi Province Lab of Tissue Engineering the College of Life Sciences Faculty of Life Science & Medicine Northwest University Fluorescence Research Group Singapore University of Technology and Design Baoji AIE Research Center Shaanxi Key Laboratory of Phytochemistry College of Chemistry and Chemical Engineering Baoji University of Arts and Sciences

Dual-state emission(DSE) molecules displayed conspicuous fluorescent performance both in solid and solution states. However, the construction of DSE molecules and the regulation of their emission wavelengths remains a great challenge. Based on the structure-function relationship of quinolinonitrile-type fluorophores, this work proposed a feasible strategy for modulating their fluorescent properties into DSE via limiting the torsion angle between the quinoline ring and C=C bond in the range of 4.7° to 30°.Based on this strategy, 53 compounds were obtained which displayed tunable emission wavelengths from397 nm to 740 nm in solid-state and from 360 nm to 672 nm in solution. The feasibility of the strategy was supported by a series of theoretical calculations, optical characterizations, and crystal analysis, suggesting the compounds have great potential in imaging living cells and tissues with desired wavelengths.

关键词： Dual-state emission Fluorescence Fluorescent imaging Structure-function relationship Wavelength regulation

基于聚集诱导效应(AIE)-激发态分子内质子转移(ESIPT)效应的四苯乙烯荧光探针对Zn(Ⅱ)检测研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

有机化学 2024年第4期44卷 1337-1342页

作者：张继东杨垚张杰厍伟安康学院化学化工学院陕西省富硒食品质量监督检验中心陕西安康725000 中国富硒产业研究院农业农村部富硒产品开发与质量控制重点实验室陕西安康725000

设计合成了一种以四苯乙烯为荧光基团、邻香草醛为识别基团的聚集诱导效应(AIE)Zn^(2+)荧光探针.探针的结构通过^(1)H NMR、质谱及X射线单晶衍射进行了表征.荧光光谱研究发现,探针对Zn^(2+)表现出良好的选择性和灵敏性,荧光强度随着Zn^(... 详细信息

设计合成了一种以四苯乙烯为荧光基团、邻香草醛为识别基团的聚集诱导效应(AIE)Zn^(2+)荧光探针.探针的结构通过^(1)H NMR、质谱及X射线单晶衍射进行了表征.荧光光谱研究发现,探针对Zn^(2+)表现出良好的选择性和灵敏性,荧光强度随着Zn^(2+)的浓度增大而逐渐增强.通过Job plot和单晶结构表征发现,探针与Zn^(2+)是2∶1的结合模式,检测限为56.2 nmol·L^(-1).检测机理归因于激发态分子内质子转移(ESIPT)和AIE效应.该新型AIE探针可作为分析测定Zn^(2+)的一种便捷工具.

关键词：四苯乙烯聚集诱导发光荧光探针锌配合物

粉煤灰基P型沸石吸附水中Cu^(2+)和Cd^(2+)

在线全文

学校读者我要写书评

暂无评论

中国环境科学 2024年第6期44卷 3132-3141页

作者：孙昊勇汪泽华姚亦扬吴代赦南昌大学资源与环境学院江西南昌330031 萍乡学院材料与化学工程学院江西萍乡337000

以粉煤灰(FA)为原料经水热反应合成了P型沸石(Z-P).采用X射线荧光光谱仪、X射线衍射仪、场发射环境扫描电子显微镜、比表面孔径分析仪、傅里叶变换红外光谱仪和X射线光电子能谱对Z-P进行表征,并研究了其对Cu^(2+)和Cd^(2+)的吸附性能.... 详细信息

以粉煤灰(FA)为原料经水热反应合成了P型沸石(Z-P).采用X射线荧光光谱仪、X射线衍射仪、场发射环境扫描电子显微镜、比表面孔径分析仪、傅里叶变换红外光谱仪和X射线光电子能谱对Z-P进行表征,并研究了其对Cu^(2+)和Cd^(2+)的吸附性能.结果表明,Z-P的BET比表面积和孔隙体积分别为38.46m^(2)/g和0.2180cm^(3)/g,均高于FA的1.273m^(2)/g和0.0120cm^(3)/***、Z-P对Cu^(2+)和Cd^(2+)的吸附更符合拟二级动力学模型和Langmuir等温线模型.Z-P对Cu^(2+)和Cd^(2+)的最大吸附量分别为157.48,131.57mg/g,远高于于FA的30.88,25.47mg/g.Z-P对Cd^(2+)的循环再生吸附效果好,但对Cu^(2+)的循环再生吸附效果较差.离子强度对Z-P吸附Cu^(2+)和Cd^(2+)分别起促进和抑制作用.表明Z-P可以作为有效且廉价的Cu^(2+)、Cd^(2+)吸附剂,为FA的资源化利用和含Cu^(2+)、Cd^(2+)重金属离子废水吸附剂的开发提供了一种方法.

关键词：粉煤灰 P型沸石吸附 Cu^(2+) Cd^(2+)

巩膜穿通血管在近视眼性脉络膜新生血管形成中的研究进展

在线全文

学校读者我要写书评

暂无评论

中华眼科杂志 2024年第1期60卷 90-94页

作者：姚王静佘相均沈丽君温州医科大学附属眼视光医院国家眼部疾病临床医学研究中心温州325027 浙江省人民医院杭州医学院附属人民医院眼科杭州310000

近视眼性脉络膜新生血管(mCNV)是病理性近视眼的严重并发症之一。目前的主要治疗方式为抗血管内皮生长因子(VEGF),虽可显著提高mCNV患者的视力,但存在复发率高,疗效不统一的问题。以往的研究认为,脉络膜变薄和缺血是导致脉络膜新生血管... 详细信息

近视眼性脉络膜新生血管(mCNV)是病理性近视眼的严重并发症之一。目前的主要治疗方式为抗血管内皮生长因子(VEGF),虽可显著提高mCNV患者的视力,但存在复发率高,疗效不统一的问题。以往的研究认为,脉络膜变薄和缺血是导致脉络膜新生血管的重要原因,新近研究提示,除了脉络膜因素外,巩膜穿通血管(PSV)与mCNV发生、疗效等紧密联系。本文对PSV的定义,影像学分类及特征,PSV与mCNV的发生、临床疗效等进行全方位阐述,以期深入认识其在mCNV中的作用及潜在机制。

关键词：近视,退行性脉络膜新生血管化破裂,自发性巩膜体层摄影术,光学相干荧光素血管造影术

香葱伴生番茄对青枯病及根际微生态特征的影响

在线全文

学校读者我要写书评

暂无评论

广东农业科学 2024年第1期51卷 10-20页

作者：佘小漫姚挺黄真珍何自福广东省农业科学院植物保护研究所/农业农村部华南果蔬绿色防控重点试验室/广东省植物保护新技术重点试验室广东广州510640 广东省农业技术推广中心广东广州510145

【目的】为明确香葱伴生对番茄青枯病及根际微生态特征的影响,揭示香葱伴生番茄降低青枯病发病率的机理。【方法】通过田间试验设置番茄单作和香葱伴生番茄2个处理,分别采集单作发病番茄(QK)、单作健康番茄(NBS)和香葱伴生番茄(BS)的根... 详细信息

【目的】为明确香葱伴生对番茄青枯病及根际微生态特征的影响,揭示香葱伴生番茄降低青枯病发病率的机理。【方法】通过田间试验设置番茄单作和香葱伴生番茄2个处理,分别采集单作发病番茄(QK)、单作健康番茄(NBS)和香葱伴生番茄(BS)的根际土壤,应用16S rDNA高通量测序和液相色谱-质谱联用(LC-MS)技术,探究香葱伴生对番茄根际微生态特征的影响。【结果】田间试验结果表明,番茄单作处理和香葱伴生番茄处理的青枯病平均病株率分别为50.48、31.43%,香葱伴生番茄处理对番茄青枯病的防治效果为37.74%。16S rDNA高通量测序结果表明,BS、NBS根际土壤细菌群落相对丰度和多样性均显著高于QK;与QK相比,BS和NBS根际土壤细菌茄科雷尔氏菌属相对丰度显著降低,而芽孢杆菌属相对丰度升高;与NBS相比,BS根际土壤细菌茄科雷尔氏菌属相对丰度降低,芽孢杆菌属相对丰度显著提高。利用LC-MS技术共鉴定出番茄根际土壤代谢物586种,其中正离子模式代谢物320种,负离子模式代谢物266种,并将代谢物的功能注释至新陈代谢、遗传信息加工和环境信息加工等代谢通路;与NBS相比,BS根际土壤代谢物中的缬氨酸、L-天冬酰胺和柠檬酸的含量均显著降低,L-赖氨酸、谷氨酸、D-谷氨酰胺和异亮氨酸的含量也低于NBS,但差异未达到显著水平。【结论】香葱伴生番茄显著降低番茄青枯病田间发病率,改变了番茄根际土壤中细菌群落结构和番茄根际土壤代谢物含量。

关键词：香葱伴生番茄青枯病根际土壤细菌根际土壤代谢物防效

维普期刊数据库博看期刊

融合FCN-ViT的语义分割与密度预测应用研究

在线全文

学校读者我要写书评

暂无评论

信息技术与信息化 2024年第6期 3-8页

作者：姚玉佘雅丽三峡大学水电工程智能视觉监测湖北省重点实验室湖北宜昌443000 三峡大学计算机与信息学院湖北宜昌443000

针对河岸植被分布复杂性及密度多样性带来的监测难题,提出了一个语义分割与密度预测双重网络SEGDEN-Net,实现并行植被高精度分割和密度预测。首先,采用无人机获取三峡库区香溪河河道的航拍图像,构建了一个包含语义标签和密度标签的数据... 详细信息

针对河岸植被分布复杂性及密度多样性带来的监测难题,提出了一个语义分割与密度预测双重网络SEGDEN-Net,实现并行植被高精度分割和密度预测。首先,采用无人机获取三峡库区香溪河河道的航拍图像,构建了一个包含语义标签和密度标签的数据集。其次,融合全卷积神经网络(fully convolutional network,FCN)和Vi T(vision transformer)各自优势,捕捉多尺度的局部与全局信息。最后,增设了一个密度预测分支,达到并行预测,以减少时间与计算成本。实验结果表明,与其他经典网络相比,所提出的模型在mIoU、准确率和Kappa系数等指标上均有提升,密度预测任务的预测结果达到了比人工标记更高的精度。两任务的结合及并行预测降低了各方面的成本,可进一步应用于重金属污染估计,为环境保护提供新的技术手段。

关键词：航拍图像语义分割植被密度预测 ViT 重金属污染

基于TabNet的周仲瑛教授辨治甲状腺功能亢进病机预测模型及用药规律研究

在线全文

学校读者我要写书评

暂无评论

南京中医药大学学报 2024年第5期40卷 534-542页

作者：杨晓娜朱垚幸享玲周作建佘侃侃南京中医药大学人工智能与信息技术学院江苏南京210023 江苏省智慧中医药健康服务工程研究中心江苏南京210023

目的以周仲瑛教授治疗甲状腺功能亢进(甲亢)的临床病案为研究对象,探索运用基于神经网络的TabNet模型发现甲亢的诊疗规律,为传承名老中医学术思想、辅助临床诊疗提供方法参考。方法基于周仲瑛教授及其团队的临床甲亢诊疗医案,构建标准... 详细信息

目的以周仲瑛教授治疗甲状腺功能亢进(甲亢)的临床病案为研究对象,探索运用基于神经网络的TabNet模型发现甲亢的诊疗规律,为传承名老中医学术思想、辅助临床诊疗提供方法参考。方法基于周仲瑛教授及其团队的临床甲亢诊疗医案,构建标准化、结构化训练数据,研究基于注意力机制和稀疏特征选择机制的算法,通过输入标准化临床表现,标准化舌象、脉象构建病机预测模型,分析核心症状、病机和药物以及三者之间的联系。结果通过训练好的预测模型对肝郁、肝火、痰饮、肾虚、阴虚、瘀血6个病机进行预测,与决策树、随机森林等经典算法构建的多标签分类模型相比,本模型分类和预测指标均较好。通过决策树算法进行挖掘,总结6个核心病机对应中药社团:醋柴胡、夏枯草、牡蛎、炙鳖甲、玄参、天冬、麦冬等。结论在临床医案数据上运用TabNet算法,构建基于临床表现、舌象和脉象的病机预测模型,可有效地预测核心病机,进而发现“症-机-药”之间的联系,为名老中医学术思想的传承和临床辅助诊疗决策提供方法学参考。

关键词：甲状腺功能亢进 TabNet 神经网络症-机-药国医大师周仲瑛病机预测用药规律