Results 51 to 60 of about 14,877 (159)
广州地区2460例呼吸道感染患者7种呼吸道病原体RNA检测结果分析
Zhongguo shiyan zhenduanxue, 2021 目的通过检测7种呼吸道病原体RNA,了解广州地区呼吸道病原体的分布和流行情况。方法采用核酸双扩增法检测2019年3月至2020年2月广东省人民医院2460例呼吸道感染门诊和住院患者咽喉拭子中7种呼吸道病原体RNA,并对患者的性别、年龄、病原体的季节分布等进行统计分析。结果广州地区2640例呼吸道疾病患者7种呼吸道病原体RNA的总阳性率为8.46%(208/2460),阳性率最高的是呼吸道合胞病毒,阳性率为2.85%,其次为肺炎支原体和副流感病毒。女性患者肺炎支原体RNA阳性率明显高于男性患者 ...
刘胜男 +6 more
doaj
Comprehensive Geochemical Evaluation and Influencing Factors of Topsoil Nutrients in a Farming Area of Dabie Mountain in Western Anhui, China [PDF]
Western Anhui is an important precision agricultural area in China, characterized by diverse landforms and multiple soil types. To determine the spatial distribution of soil nutrient elements and their controlling factors, we analyzed 5 nutrient ...
Chao SONG +5 more
core +1 more source
Journal of Critical Infrastructure Policy, Volume 7, Issue 1, Spring/Summer 2026.ABSTRACT The National Quality Infrastructure (NQI) in a given country provides the essential framework for quality assurance integrating standardization, metrology, accreditation, and conformity assessment to create the technical backbone for industry and trade. Hence, building a resilient NQI is fundamental to securing medicine quality, enabling local
Addisu Afrassa Tegegne +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2011 在丹江鹦鹉沟小流域利用典型样地取样法,进行土样采集,共选取78样点,测定土壤4个不同深度的养分含量。应用传统统计学和地统计学的方法,对不同深度土壤总氮含量进行了分析。结果表明:土壤总氮含量均值、最大值和最小值均表现为A1>A2>A3>A4,随土壤深度的增加而降低。经Kriging插值分析,由A1到A4总氮分布逐渐由小的斑块向大的斑块转变,总氮变化范围逐渐变小 ...
徐国策 +4 more
doaj
Guangtongxin yanjiu, 2021 针对传统相干光通信系统中光纤链路传输性能评估方法理论计算复杂且计算时间较长的问题，文章采用机器学习技术对调制格式和输入光功率等参数各异信道的相干光传输系统传输性能进行关联式建模和精确评估。建模和评估结果表明，该机器学习模型能够代替复杂的理论计算，并且能够较为准确地给出预测值，理论计算值与模型预测Q值整体的平均误差为0.27 dB，理论计算值与模型预测光信噪比（OSNR）值整体的平均误差为0.33 dB；采用机器学习模型的计算时间稳定在4.4 s左右 ...
陈中盛, 高冠军, 刘鸿飞
doaj
A Mini Review of Scientific Designs of Dynamic Responsive Fluids in Battery Technologies
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Dynamic responsive fluids are emerging as transformative elements in the evolution of battery technologies, marking a pivotal shift from static passive designs toward systems that actively sense and adapt to their operating environments. By integrating dynamic responsive fluids, batteries can interact with both internal and external stimuli in
Xiu‐Zhen Yang +11 more
wiley +1 more source
尼莫地平对不同时间点高血压脑出血患者血清炎性因子影响的实验研究
Zhongguo shiyan zhenduanxue, 2015 目的观察尼莫地平对不同时间点高血压脑出血患者血清炎性因子的影响。方法实验分3组,选取2012年4月至2014年2月我院收治的高血压脑出血患者80例,随机分为:常规治疗组采用常规治疗（n=40例）,尼莫地平治疗组在常规治疗的基础上加尼莫地平治疗（n=40例）,2组疗程均4周;同期住院的中枢神经系统非器质性疾病患者20例作为对照组;于24h、48h、72h、7d、14d、28d抽取患者肘静脉血,采用酶联免疫法检测各组血清中炎性因子IL-4、IL-6和IL-10蛋白含量的变化 ...
段淑霞, 刘涛, 王戬萌
doaj
Integrated system of marine environmental monitoring and assessment in estuary 1: A case study of water surveillance monitoring in Pearl River Estuary [PDF]
, 2014 本文以珠江口水环境监视性监测为研究对象,借鉴欧盟水框架协议监测分类方法,明确监测目的,根据河口生物地球化学的基本原理,在实践中采用逐步修正的方法(STEP-by-STEP APPrOACH)对水环境监视性监测方案进行重新设计和实施,并在此基础上构建珠江口水环境监视性监测体系。其中,监测站位的优化根据监测结果采用克里金法和专家评判法;监测方案其他内容的优化主要采用专家评判法。Estuary is the area with the strongest land-sea interaction,human ...
叶璐 +5 more
core
Distribution Characteristics, Ecological Risks, and Source Identification of Heavy Metals in Cultivated Land in Xingyang City [PDF]
The quality of arable land is closely related to people’s livelihoods, and heavy metals are one of the significant factors affecting arable land quality.
Xinlei ZHAO +3 more
core +1 more source
International Journal of Urban and Regional Research, Volume 50, Issue 1, Page 191-220, January 2026.Abstract Henry George advocated for capturing land value increases for public ends. The active approach of public authorities organizing and financing land development can help capture higher land value increases, as Hartman and Spit indicate. However, this approach hardly happens in developing countries, where the coalition of private developers and ...
Nannan Xu
wiley +1 more source