检索结果-南通市图书馆

COVID-19 vaccination program in the mainland of China: a subnational descriptive analysis on target population size and current progress

在线全文

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2021年第5期10卷 87-87页

作者： Wen Zheng Xuemei Yan zeyao zhao Juan Yang Hongjie Yu Shanghai Institute of Infectious Disease and Biosecurity School of Public HealthFudan UniversityShanghaiChina

Background:China is facing substantial risks of imported coronavirus disease 2019(COVID-19)cases and a domestic resurgence in the long run,and COVID-19 vaccination is expected to be the long-lasting solution to end the *** aim to estimate the size of the target population for COVID-19 vaccination at the provincial level in the mainland of China,and summarize the current progress of vaccination programs,which could support local governments in the timely determination and adjustment of vaccination policies and promotional ***:We conducted a descriptive study of the entire population in the mainland of China,between December 2020 and August *** extracting provincial-stratifed data from publicly available sources,we estimated the size of priority target groups for vaccination programs,and further characterized the ongoing vaccination program at the provincial level,including the total doses administered,the coverage rate,and the vaccination capacity needed to achieve the target coverage of 80%by the end of *** used R(version 4.1.0)to complete the descriptive ***:The size of the target population shows large diferences among provinces,ranging from 3.4 million to 108.4 *** of 31 August,2021,the speed of vaccine roll-out difers considerably as well,with the highest coverage occurring in Beijing and Shanghai,where 88.5%and 79.1%of the population has been fully vaccinated,*** 22 of 31 provincial-level administrative divisions(PLADs),more than 70%of the population was administered at least one dose by *** the current vaccination capacity,the target of 80%coverage could be achieved by 2021 in 28 ***:Disparities exist in the target population size and vaccination progress across provinces in the mainland of *** has made great strides in the vaccination speed since roll-out,and could basically achieve the targeted vaccine coverage.

关键词： Novel coronavirus disease 2019 Vaccination Target population China

Fertilization and clear-cutting effects on greenhouse gas emissions of pinewood nematode damaged Masson pine plantation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecosystem Health and Sustainability 2021年第1期7卷 18-27页

作者： Xue Zhang zeyao zhao Tong Chen Tianyu zhao Lihao Song Li Mei College of Horticulture and Forestry Sciences/Hubei Engineering Technology Research Center for Forestry Information Huazhong Agricultural UniversityWuhanChina Xiangyang Natural Resources and Planning Bureau Forestry Research Institute of XiangyangXiangyangChina

Introduction:Management practices are essential for maintaining forest ecological functions under increasing diseases and pest *** effects of nitrogen fertilization(NF)and clear-cutting(CC)on the soil microbial community structure and greenhouse gases emission were investigated of pinewood nematodes(Bursaphelenchus xylophilus)-infected Masson pine(Pinus massoniana)***:CC increased the soil microbial biomass carbon(SMBC)and soil microbial biomass nitrogen(SMBN)contents relative to the control(CK).NF increased the SMBN but had no significant effect on the SMBC *** total fungal and bacterial abundances increased in the CC treatment compared with the CK,but there was no significant difference between the NF and *** cumulative soil CO_(2)emission(-2.35 t C·hm^(-2))was higher than that of CK(1.65 t C·hm^(-2))in summer,and the cumulative annual N_(2)O emission(16.90 kg N·hm^(-2)yr^(-1))of NF was approximately 47 times of CK(0.36 t N·hm^(-2)·yr^(-1)).CC increased the CO_(2)flux(-2.21 t C·hm^(-2))in summer but have no significantly effects on N_(2)O ***:These results indicated that NF and CC practices changed forest soil microbial community structure and affected soil greenhouse gas emissions in pinewood nematodes-infected Masson pine *** CO_(2)emission rates increased in the NF and CC treatments,which reduced the carbon sequestration function of forests and had a negative impact on climate change.

关键词： Masson pine(Pinus massoniana) pinewood nematode forest management greenhouse gases microbial community structure

模拟氮沉降对马尾松土壤微生物群落结构及温室气体释放的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

生态学报 2019年第6期39卷 1917-1925页

作者：张雪梅莉宋利豪刘力诚赵泽尧华中农业大学园艺林学学院湖北省林业信息工程技术研究中心武汉430070

以2年生马尾松(Pinus massoniana)盆栽苗土壤为对象,通过施氮肥模拟氮沉降对土壤理化性质、微生物群落结构及温室气体释放的影响,探明氮沉降对森林土壤温室气体释放的驱动机制。结果表明,模拟氮沉降处理显著提高了土壤速效氮含量和苗木... 详细信息

以2年生马尾松(Pinus massoniana)盆栽苗土壤为对象,通过施氮肥模拟氮沉降对土壤理化性质、微生物群落结构及温室气体释放的影响,探明氮沉降对森林土壤温室气体释放的驱动机制。结果表明,模拟氮沉降处理显著提高了土壤速效氮含量和苗木根系氮含量;土壤微生物碳(SMBC)含量比对照显著下降78%,而土壤微生物氮(SMBN)则提高2.6倍。模拟氮沉降处理显著降低土壤中微生物群落总含量。施氮肥对马尾松土壤N_2O和CO_2的释放速率均有显著影响,增施氮肥不仅显著提高了土壤N_2O的释放速率,而且CO_2释放速率短期内也显著提高,但伴随微生物群落的下降,施肥后期CO_2释放速率表现下降趋势。相关分析表明,土壤CO_2和N_2O释放与土壤pH值、土壤温度、土壤湿度、土壤速效氮含量及SMBC、SMBN相关;逐步回归分析表明,土壤硝态氮含量的变化是驱动土壤温室气体释放的主导因子。3株种植单位土壤体积内根系生物量较高,增加了土壤水分的消耗速率和氮的吸收固定,因而减少N_2O的释放速率。以上研究阐明了氮沉降或过量施肥对土壤氮含量、土壤pH值、根系生物量及氮含量、土壤微生物群落结构等因子的影响,这些因子直接或间接影响土壤温室气体释放速率。氮沉降及施用氮肥是加快土壤温室气体(CO_2和N_2O)排放进程的重要因素。

关键词：马尾松氮沉降土壤呼吸微生物群落结构温室气体

Selective growth of semiconducting single-walled carbon nanotubes solely from carbon monoxide

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第11期16卷 12720-12726页

作者： Xue zhao Ningfei Gao zeyao Zhang Qidong Liu Jian Sheng Yijie Hu Ruoming Li Haitao Xu Lianmao Peng Yan Li Beijing National Laboratory for Molecular Sciences Key Laboratory for the Physics and Chemistry of NanodevicesState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing HuaTanYuanXin Electronics Technology Ltd.Co. Beijing 101399China Institute of Carbon-Based Thin Film Electronics Peking UniversityShanxiTaiyuan 030012China Institute of Advanced Functional Materials and Devices Shanxi UniversityTaiyuan 030031China PKU-HKUST ShenZhen-HongKong Institution Shenzhen 518057China

The selective growth of semiconducting single-walled carbon nanotubes(s-SWCNTs)is of great importance in many high-end applications represented by ***,we developed a general approach to grow horizontally aligned s-SWCNT arrays on stable temperature(ST)-cut quartz with bimetallic catalysts using carbon monoxide(CO)as both catalyst reductant and single component carbon feedstock under atmospheric *** disproportionation of CO produces not only carbon species for SWCNT growth but also CO_(2),which could act as an in-situ etchant to remove both amorphous carbon and metallic *** employment of bimetallic catalyst and quartz substrate facilitates the selective etching by narrowing the diameter distribution of as-grown SWCNT *** the optimized conditions,we realized the selective growth of horizontally aligned s-SWCNT arrays with the content above 97%using CoCu catalysts,confirmed by Raman characterization and electrical measurements of the fabricated field effect transistor *** CO-based process in selective growth of s-SWCNTs has demonstrated its feasibility and universality by the broad growth window and applicability for other bimetallic catalysts,such as FeCu and *** possesses a practical potential in obtaining semiconducting channel materials for the scalable fabrication of CNT-based devices.

关键词： carbon monoxide semiconducting single-walled carbon nanotubes arrays bimetallic catalysts

油茶林生草栽培对地表径流及氮磷流失特征的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

南京林业大学学报（自然科学版） 2021年第6期45卷 127-134页

作者：陈隆升梅莉陈永忠赵泽尧许彦明张震胡亚军刘彩霞苏以荣湖南省林业科学院国家油茶工程技术研究中心湖南长沙410004 华中农业大学园艺林学学院湖北省林业信息工程技术研究中心湖北武汉430070 中国科学院亚热带农业生态研究所湖南长沙410125

【目的】研究间种草本植物对油茶林地表径流以及随径流流失的溶解态氮磷的影响,以期降低油茶林面源污染风险并改善下游水体环境,为油茶高效生态经营提供参考。【方法】选取林下植被覆盖度低的5年生油茶幼林,设计3个试验处理:无间种对照... 详细信息

【目的】研究间种草本植物对油茶林地表径流以及随径流流失的溶解态氮磷的影响,以期降低油茶林面源污染风险并改善下游水体环境,为油茶高效生态经营提供参考。【方法】选取林下植被覆盖度低的5年生油茶幼林,设计3个试验处理:无间种对照、间种百喜草和间种金鸡菊,每个试验处理面积600 m^(2),3次重复,同时,在每个试验样地建设水平投影为16 m×7 m的标准径流监测小区,共计9个径流监测区。经过2年的生草处理后,间种百喜草和金鸡菊的油茶林下植被覆盖度从对照的31.13%分别提高到90.47%和80.40%。在此基础上,通过土壤理化性质测定、多场次的地表径流及其氮磷含量的监测,比较各处理样地的地表径流量、土壤侵蚀量、径流溶解态氮(DN)和溶解态磷(DP)流失量的变化特征,分析南方油茶幼林生草栽培对地表径流及氮磷流失的影响。【结果】油茶林下间种百喜草和金鸡菊2年后,土壤有机质、全氮及全磷含量均比对照有增加趋势。2020年6—7月,在试验区共观测到5场侵蚀性降雨事件。与对照处理相比,间种百喜草和金鸡菊的处理在5场侵蚀性降雨事件中均显著降低了地表径流量和土壤侵蚀量(P<0.05)。与对照相比,间种百喜草和金鸡菊处理的地表总径流量分别减少了35.04%和33.56%,土壤累积侵蚀量分别减少了83.89%和79.85%。不同场次径流中DN和DP浓度变化趋势不一致,第1和第2场径流中DN浓度较低而DP浓度较高,第4和第5场径流中DN浓度较高而DP浓度较低。所有观测场次的径流DN和DP浓度均值超过了GB 3838—2002《地表水环境质量标准》中总氮、总磷Ⅴ类标准限值。与对照相比,间种百喜草能够显著降低径流中DN和DP浓度(P<0.05),减少量分别为4.67%和16.88%;而间种金鸡菊后径流DP浓度显著降低了16.88%(P<0.05),但DN浓度却增加了5.14%(P<0.05)。总体上,与对照处理相比,间种百喜草和金鸡菊分别降低了径流DN流失量26.66%和21.49%、径流DP流失量63.06%和50.57%。【结论】间种百喜草和金鸡菊的油茶林地显著降低了地表径流量和土壤侵蚀量,显著减少了径流溶解态氮磷流失量,相较而言,油茶幼林间种百喜草对林地地表径流及其可溶性氮磷流失的阻控效果比间种金鸡菊的好。

关键词：油茶林金鸡菊百喜草氮、磷流失地表径流

Growth of Single-walled Carbon Nanotubes on Substrates Using Carbon Monoxide as Carbon Source

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2021年第5期37卷 1125-1129页

作者： zhao Xue ZHANG Xinrui LIU Qidong ZHANG zeyao LI Yan Beijing National Laboratory for Molecular Science Key Laboratory for the Physics and Chemistry of NanodevicesState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871P.R.China Peking University Shenzhen Institute Shenzhen518057P.R.China College of Engineering Peking UniversityBeijing100871P.R.China PKU-HKUST ShenZhen-HongKong Institution Shenzhen518057P.R.China

The growth of single-walled carbon nanotubes(SWCNTs)on substrates has attracted great interests because of the potential applications in various *** monoxide(CO)was used as the carbon source for the growth of SWCNTs on silicon *** or oriented SWCNTs can be produced by varying the CO flow *** the flow rate of CO was as low as 20 sccm(sccm:standard cubic centimeter per minute).

关键词： SWCNTs Carbon walled

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

忻州市古树资源分布及文化价值研究

干旱区资源与环境 2023年第2期37卷 150-156页

作者：赵鹏宇任泽瑶忻州师范学院五台山文化研究中心忻州034000

以忻州市古树为研究对象,探讨了古树资源类型和分布。结果表明:忻州散生古树以油松、国槐、侧柏、榆树、旱柳和楸树为主,占总株数的81.94%,树种之间的数量差异悬殊,松槐柏榆为优势树种。散生单株古树及古树群总体上呈东多西少特征,主要... 详细信息

以忻州市古树为研究对象,探讨了古树资源类型和分布。结果表明:忻州散生古树以油松、国槐、侧柏、榆树、旱柳和楸树为主,占总株数的81.94%,树种之间的数量差异悬殊,松槐柏榆为优势树种。散生单株古树及古树群总体上呈东多西少特征,主要生长于传统村落四旁和寺庙中,居住民俗影响着树种在微生境的分布。忻州散生树种树龄结构,一级、二级和三级分别占27.8%、28.6%和43.6%。油松、国槐、侧柏、楸树和枣树等树种高龄古树和超高龄古树占比较高,成为古树管理保护的重点。古树承载着重要社会文化价值,其分布与保护与宗教文化、传统信仰和农耕文化有着紧密联系,在实践中触发了居民长期保护古树的实践行为,基于此提出古树景观保护策略。

关键词：古树资源分布文化价值忻州市

Patterning catalyst via inkjet printing to grow single-walled carbon nanotubes

在线全文

学校读者我要写书评

暂无评论

中国化学快报：英文版 2019年第2期30卷 505-508页

作者： zeyao Zhang Yitan Li Sheng Zhu Xiyan Liu Xiulan zhao Meihui Li Haoyu Li Feng Yang Yan Li Beijing National Laboratory for Molecular Science Key Laboratory for the Physics and Chemistry of Nanodevices State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Academy for Advanced Interdisciplinary Studies Peking University

Controlled growth of patterned single-walled carbon nanotubes (SWNTs) is an important issue in many applications. Herein, we demonstrated a method to pattern catalyst via inkjet printing for the growth of SWNTs, using metal salt solutions as the inks and an ordinary office-use printer. We printed water solutions of cobalt acetate on hydrophilic Si substrates and grew high quality SWNT films. The composition of the precursor solutions and the hydrophilicity of the substrates were crucial factors to the patterning.

关键词： Single-walled carbon nanotubes Inkjet printing Patterning Contact angle Chemical vapor deposition

新冠肺炎疫情下医生职业压力、职业创伤影响因素的调查分析

在线全文

学校读者我要写书评

暂无评论

中国医院管理 2022年第7期42卷 34-38页

作者：刘泽瑶邢倩赵明烨崔秀娟唐文熙中国药科大学国际医药商学院江苏南京211198 中国药科大学药物经济学评价研究中心江苏南京211198

目的了解新冠肺炎疫情下医生工作压力与创伤之间的关系,为改善医生心理健康状况、促进人才队伍稳定性及提高医疗服务质量提供依据。方法2021年1月3—24日,采用多个量表对南京市408名医生进行调查,采用SPSS24.0软件分析数据,描述医生职... 详细信息

目的了解新冠肺炎疫情下医生工作压力与创伤之间的关系,为改善医生心理健康状况、促进人才队伍稳定性及提高医疗服务质量提供依据。方法2021年1月3—24日,采用多个量表对南京市408名医生进行调查,采用SPSS24.0软件分析数据,描述医生职业压力现状,采用线性回归和logistic回归分析分别对医生压力源和创伤展开多因素分析,探讨医生职业压力与创伤的相互关系。结果(1)医生执业年限(β=0.023,P=0.007)、每周工作时间(β=0.124,P=0.023)可正向预测总职业压力,所在医院等级(β=-0.014,P=0.005)、职称级别(β=-0.031,P=0.012)、月收入水平(β=-0.054,P=0.026)可负向预测职业压力;(2)外部环境和工作负荷是医生最主要的压力源;(3)职业压力(β=1.768,P<0.001)可正向预测创伤,职称级别(β=-0.236,P=0.020)可负向预测创伤。结论南京市医生工作压力较大,建议对医生职业压力及心理创伤采取积极的干预措施,优化外部环境,降低医生工作负荷及职业压力。

关键词：新冠肺炎医生职业压力创伤