检索结果-南通市图书馆

流动作为方法:数字游民在中国乡村——以光山数字游民基地为例

在线全文

学校读者我要写书评

暂无评论

新闻界 2024年第4期 28-35,47页

作者：沙垚中国社会科学院大学新闻传播学院北京100021 中国社会科学院新闻与传播研究所北京100021

近年来,数字游民的概念和模式在乡村振兴领域颇受欢迎,但舶来的数字游民本质上是一个互联网产品,乡村在其框架中更多是作为文化和生态的空间消费场景而出现的,青年与乡村很难有深刻的互动。但是,在该概念旅行的过程中,一些数字游民基地... 详细信息

近年来,数字游民的概念和模式在乡村振兴领域颇受欢迎,但舶来的数字游民本质上是一个互联网产品,乡村在其框架中更多是作为文化和生态的空间消费场景而出现的,青年与乡村很难有深刻的互动。但是,在该概念旅行的过程中,一些数字游民基地也开始了本土化的调试。通过对这些新实践的田野观察,研究发现:中国乡村的数字游民基地建设,不再将互联网逻辑作为主导性逻辑,而是以县域高质量发展中的问题为导向,结合乡村振兴战略,致力于解决青年入乡的最后一公里问题,在创造青年和乡村见面机会的同时,探索性地发展出兼具城乡要素的融合式的生产生活新方式,以青年流动为方法,破解城乡之间资源要素双向流动的难题。聚焦流动,也是在理论层面重返传播。

关键词：数字游民流动乡村振兴城乡融合

PAN-TB治疗策略的实施对结核病防控的意义及挑战

在线全文

学校读者我要写书评

暂无评论

中国防痨杂志 2024年第10期46卷 1188-1192页

作者：沙巍同济大学附属上海市肺科医院结核病临床研究中心上海200433

全球耐药结核病的防控仍面临巨大挑战,PAN-TB方案是适用于所有结核病的一线方案,即确诊活动性结核病后即启动该方案,而不需要获得患者的耐药情况。推行PAN-TB方案的目的是旨在尽快启动有效治疗,降低传播,并可以大幅度减轻结核病规划管... 详细信息

全球耐药结核病的防控仍面临巨大挑战,PAN-TB方案是适用于所有结核病的一线方案,即确诊活动性结核病后即启动该方案,而不需要获得患者的耐药情况。推行PAN-TB方案的目的是旨在尽快启动有效治疗,降低传播,并可以大幅度减轻结核病规划管理的复杂性。它不仅是临床治疗方法,更是公共卫生手段。本文就PAN-TB策略的定义、方案的要求、全球的研究进展,以及对于结核病防控的意义和目前面临的挑战进行阐述,以期为中国结核病的防控提供新的思路。

关键词：结核抗结核药治疗应用方案评价

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

自然的几何化:切萨尔皮诺的植物分类思想

科学技术哲学研究 2024年第2期41卷 93-100页

作者：杨莎西北大学科学史高等研究院西安710127

意大利植物学家切萨尔皮诺通常被认为是近现代植物分类学的奠基者,是植物分类学史上“第一个真正的体系构建者”。他在构建体系时将亚里士多德先验原则与他观察、解剖植物的实际经验相结合,采用逻辑划分法,以结实部分的形态为主要分类... 详细信息

意大利植物学家切萨尔皮诺通常被认为是近现代植物分类学的奠基者,是植物分类学史上“第一个真正的体系构建者”。他在构建体系时将亚里士多德先验原则与他观察、解剖植物的实际经验相结合,采用逻辑划分法,以结实部分的形态为主要分类依据。由于采用了划分法,其体系常被后来学者诟病“不自然”,但事实上切萨尔皮诺也清楚这一点,只是当时所知植物数量有限,他没有太多选择。切萨尔皮诺对植物分类学更重要的贡献在于将分类依据限于植物的几何形态方面,排除了颜色、生境、用途等属性,这点与当时学者对“形式”概念的发展密切相关。依据形态分类并用数学语言来描述形态,这意味着欧洲16—17世纪对生物体的研究同样受到了数学化、几何化潮流的影响。

关键词：切萨尔皮诺植物分类学史自然的几何化形式本质

Insights from i-Tree Eco-efficiency Assessment Management of Urban Trees in Oxford,UK

在线全文

学校读者我要写书评

暂无评论

Journal of Landscape Research 2024年第4期16卷 1-4,12页

作者： YANG Xin LI Bowen LI sha School of Architecture and Art North China University of TechnologyBeijing 100144China School of Architecture&Design China University of Mining and TechnologyXuzhouJiangsu 221000China

In the era of stock development following the acceleration of urbanization,the revitalization of urban green space has assumed an increasingly significant ***,the management of urban trees has emerged as a critical focus of urban governance,contributing to the enhancement of livability in human *** study offers a comprehensive analysis of the urban tree management system in Oxford,UK,identifying that its primary objective is to optimize and maintain a harmonious balance between human activities and the natural environment through the implementation of high-quality planting *** system emphasizes enhanced management practices and establishes a robust framework for the development of targeted policies and management regulations,utilizing i-Tree eco-efficiency assessment and real-time feedback ***’s urban tree management is in its nascent stages,and there is an urgent need for the development of urban green *** adopting the refined management assessment methodologies employed for urban trees in Oxford,UK,it is possible to enhance the ecological value of urban trees,which represent a significant green resource within cities,and contribute to the creation of more livable urban spaces.

关键词： Oxford Urban tree management i-Tree eco-efficiency assessment Insight Reference

微塑料和菲对土壤化学性质、酶活性及微生物群落的影响

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

环境科学 2024年第1期45卷 496-507页

作者：刘沙沙秦建桥吴贤格肇庆学院环境与化学工程学院广东省环境健康与资源利用重点实验室肇庆526061

微塑料和多环芳烃(PAHs)因在土壤环境中广泛存在及其潜在生态风险而受到越来越多的关注.然而,关于微塑料-PAHs复合污染对土壤生态系统的影响鲜有报道.选用聚乙烯(PE)/聚丙烯(PP)和菲(PHE)作为微塑料和PAHs的代表,进行为期300d的微宇宙... 详细信息

微塑料和多环芳烃(PAHs)因在土壤环境中广泛存在及其潜在生态风险而受到越来越多的关注.然而,关于微塑料-PAHs复合污染对土壤生态系统的影响鲜有报道.选用聚乙烯(PE)/聚丙烯(PP)和菲(PHE)作为微塑料和PAHs的代表,进行为期300d的微宇宙培养实验,利用土壤农业化学分析方法和16S扩增子测序技术研究PE/PP和PHE的单一和复合污染对土壤化学特性、酶活性和微生物群落(数量、结构、功能)的影响,分析PE/PP和PHE存在下土壤性质、酶活性和菌群的互作关系.结果表明,PE/PP和PHE的单一和复合污染对土壤pH值、有效磷(AP)和微生物(细菌、放线菌、霉菌)数量没有产生明显影响,但显著提高了荧光素二乙酸酯酶(FDAse)活性;PE、PP、PHE-PE和PHE-PP的添加显著增加了土壤有机质(SOM)含量和脲酶活性,PHE、PHEPE和PHE-PP显著增强了脱氢酶和磷酸酶活性及速效氮(AN)含量;PHE的添加对微生物群落影响不大,PE、PP、PHE-PE和PHE-PP对群落产生了一定的影响.PE/PP和PHE能够促进微生物产生能量、生长和繁殖,加快污染物的代谢/降解和细胞膜转运等功能.PE/PP和PHE引起的AN和SOM变化是影响土壤酶活性的关键因子,AN、AP和pH的改变是微生物数量增加的主要原因;微生物群落结构的改变与土壤化学性质、酶活性具有一定的相关性,其中SOM对菌群的影响达到了显著水平,土壤中不同碳源(PE/PP和PHE)的存在及菌与菌之间的互作关系也会影响微生物群落的组成.综上,PE/PP和PHE通过改变土壤化学性质、酶活性和微生物群落及其互作过程来促进菌群适应污染物胁迫.

关键词：微塑料菲(PHE) 土壤性质酶活性微生物群落

Diagnosis of Acute Q Fever in an Elderly Patient Using Metagenomic Next-Generation Sequencing:A Case Report

在线全文

学校读者我要写书评

暂无评论

Journal of Clinical and Nursing Research 2024年第9期8卷 36-39页

作者： sha.ha Zang sha.Liu Lili Tan Department of Geratology The Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina Department of Cardiology The Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina

Query fever(Q fever)is a globally spread zoonotic disease caused by Coxiella burnetii,commonly found in natural foci but rarely seen in Hebei *** clinical manifestations of Q fever are diverse and nonspecific,which often leads to missed or incorrect diagnoses in clinical *** article reports a case of acute Q fever diagnosed in an elderly patient using metagenomic next-generation sequencing.

关键词： Elderly patient Acute Q fever Metagenomic next-generation sequencing(mNGS)

Near infrared emissions from both high efficient quantum cutting (173%) and nearly-pure-color upconversion in NaY(WO_(4))_(2):Er^(3+)/Yb^(3+) with thermal management capability for silicon-based solar cells

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第1期13卷 113-126页

作者： Duan Gao Baojiu Chen Xuezhu sha.Yuhang Zhang Xin Chen Li Wang Xizhen Zhang Jinsu Zhang Yongze Cao Yichao Wang Lei Li Xiangping Li sai Xu Hongquan Yu Lihong Cheng School of Science Dalian Maritime UniversityDalian 116026 LiaoningChina

Raising photoelectric conversion efficiency and enhancing heat management are two critical concerns for siliconbased solar *** this work,efficient Yb^(3+) infrared emissions from both quantum cutting and upconversion were demonstrated by adjusting Er^(3+) and Yb^(3+) concentrations,and thermo-manage-applicable temperature sensing based on the luminescence intensity ratio of two super-low thermal quenching levels was discovered in an Er^(3+)/Yb^(3+) codoped tungstate *** quantum cutting mechanism was clearly decrypted as a two-step energy transfer process from Er^(3+) to Yb^(3+).The two-step energy transfer efficiencies,the radiative and nonradiative transition rates of all interested 4 f levels of Er^(3+) in NaY(WO_(4))_(2) were confirmed in the framework of Föster-Dexter theory,Judd-Ofelt theory,and energy gap law,and based on these obtained efficiencies and rates the quantum cutting efficiency was furthermore determined to be as high as 173%in NaY(WO_(4))_(2):5 mol%Er^(3+)/50 mol%Yb^(3+) *** and nearly pure infrared upconversion emission of Yb3+under 1550 nm excitation was achieved in Er^(3+)/Yb^(3+)co-doped NaY(WO_(4))_(2) by adjusting Yb^(3+) doping *** Yb^(3+) induced infrared upconversion emission enhancement was attributed to the efficient energy transfer ^(4)I_(11/2)(Er^(3+))+^(2)F_(7/2)(Yb^(3+))→^(4)I_(15/2)(Er^(3+))+^(2)F_(5/2)(Yb^(3+))and large nonradiative relaxation rate of ^(4)I_(9/2).Analysis on the temperature sensing indicated that the NaY(WO_(4))_(2):Er^(3+)/Yb^(3+)serves well the solar cells as thermos-managing ***,it was confirmed that the fluorescence thermal quenching of ^(2)H_(11/2)/^(4)S_(3/2) was caused by the nonradiative relaxation of ^(4)S_(3/2).All the obtained results suggest that NaY(WO_(4))_(2):Er^(3+)/Yb^(3+) is an excellent material for silicon-based solar cells to improve photoelectric conversion efficiency and thermal management.

关键词： quantum thermal relaxation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

水氮亏缺对春小麦产量影响的生理机制研究

节水灌溉 2024年第8期 35-42,52页

作者：曹润宁王浩莎黄兴法甘肃武威绿洲农业高效用水国家野外科学观测站甘肃武威733000 中国农业大学水利与土木工程学院北京100083

于2022和2023年在甘肃武威采用大田试验,研究了不同水氮条件下春小麦叶面积、叶水势、光合特性和产量的变化和产量形成的生理机制。选定“永良4号”(YL4)和“陇春41号”(LC41)2个品种的春小麦作为研究对象,每个品种设置4个处理,包括2个... 详细信息

于2022和2023年在甘肃武威采用大田试验,研究了不同水氮条件下春小麦叶面积、叶水势、光合特性和产量的变化和产量形成的生理机制。选定“永良4号”(YL4)和“陇春41号”(LC41)2个品种的春小麦作为研究对象,每个品种设置4个处理,包括2个水分处理即充分灌溉W1(预测作物需水量)和调亏灌溉W2(在拔节-孕穗期和灌浆-成熟期灌溉预测作物需水量的65%,其余生育期灌溉量为预测作物需水量的100%),2个氮肥处理即N1(当地传统施氮量,220 kg/hm^(2))和N2(减量施氮,110 kg/hm^(2))。分析了小麦旗叶面积(LA)、叶水势(Ψ_(pd))、相对叶绿素含量(SPAD)和气体交换参数(P_(n)、G_(s))、产量在不同水氮处理下的变化情况。结果表明:LC41的叶面积、叶水势、叶绿素相对含量、净光合速率、气孔导度和产量均高于YL4,水分和氮素胁迫可以降低小麦的叶面积、叶水势、叶绿素相对含量、净光合速率、气孔导度和产量;叶面积和叶水势通过调节作物光合性能影响作物产量,叶面积、叶水势和光合性能的单个性状的组合效应解释了小麦83%的产量变化,水氮胁迫通过植株水力特性降低Gs从而影响产量,较高的Ψ_(pd)和Gs是保证小麦产量形成的关键;在高氮条件下进行一定的水分亏缺减产较少,因此减少非关键生长阶段的灌水量可以维持一定的小麦产量。

关键词：春小麦水氮胁迫水力特性光合特性生理机制产量

Diatoms as indicators of environmental change in coastal areas:a case study in Lianjiang coast of East China Sea

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2024年第8期43卷 47-57页

作者： Tong Li Jihui Zhang Dongling Li Chengxu Zhou Chenxi Liu Hao Xu Bing Song Longbin sha Donghai Academy Ningbo UniversityNingbo 315211China Department of Geography and Spatial Information Techniques Ningbo UniversityNingbo 315211China College of Food Science and Engineering Ningbo UniversityNingbo 315211China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China

Owing to the significant differences in environmental characteristics and explanatory factors among estuarine and coastal regions,research on diatom transfer functions and database establishment remains *** study analysed diatoms in surface sediment samples and a sediment core from the Lianjiang coast of the East China Sea,together with environmental *** component analysis of the environmental variables showed that sea surface salinity(SSS)and sea surface temperature were the most important factors controlling hydrological conditions in the Lianjiang coastal area,whereas canonical correspondence analysis indicated that SSS and pH were the main environmental factors affecting diatom *** on the modern diatom species–environmental variable database,we developed a diatom-based SSS transfer function to quantitatively reconstruct the variability in SSS between 1984 and 2021 for sediment core HK3 from the Lianjiang coastal *** agreement between the reconstructed SSS and instrument SSS data from 1984 to 2021 suggests that diatombased SSS reconstruction is reliable for studying past SSS variability in the Lianjiang coastal *** low SSS events in AD 2019,2013,and 1999,together with an increased relative concentration of freshwater diatom species and coarser sediment grain sizes,corresponded to two super-typhoon events and a catastrophic flooding event in Lianjiang ***,a diatom-based SSS transfer function for reconstructing past SSS variability in the estuarine and coastal areas of the East China Sea can be further used to reflect the paleoenvironmental events in this region.

关键词： diatom transfer function multivariate statistical analysis environmental variable sea surface salinity