检索结果-南通市图书馆

Sedum alfredii H:A new Zn hyperaccumulating plant first found in China

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2002年第19期47卷 1634-1637页

作者： YANG Xiao’e LONG Xinxian NI Wuzhong fu chenxin College of Natural Resource and Environmental Sciences Zhejiang UniversityHangzhou 310029China College of Biology Sciences Zhejiang UniversityHangzhou 310029China

Field survey and greenhouse experiments were carried out to identify and characterize zinc (Zn) uptake and accumulation by a new Zn hyperaccumulating plant species (Sedum alfredii Hance) native to China. Zinc concentration in the shoots of Sedum alfredii Hance grown on an ancient mined area ranged from 4134 to 5000 mg/kg, with a mean of 4515 mg/kg. It suggests that Sedum alfredii could not only grow on heavily Pb/Zn contaminated soils, but also could accumulate extraordinarily high concentration of Zn. Under nutrient solution culture conditions, Sedum alfredii Hance grew healthy at Zn supplying levels from 0.006 to 240 mg · L-1. Zinc concentration in the shoots increased with external Zn levels increasing. The Zn concentration and accumulation in the shoots reached the highest at Zn supply level of SO mg/L, with 19.67 g/kg and 19.83 nig/plant, respectively. All the results showed that Sedum alfredii Hance is a new Zn hyperaccumulating plant. This provides a new plant material to explore mechanism of

关键词： Sedum alfredii Hance zinc hyperaccumulator.

在线全文

学校读者我要写书评

暂无评论

河西走廊绿洲边缘降水对土壤水分特征的影响

甘肃农业大学学报 2023年第1期58卷 137-145,155页

作者：付晨馨种培芳周海陈国鹏甘肃农业大学林学院甘肃兰州730070 中国科学院西北生态环境资源研究院甘肃兰州730000

【目的】探究干旱地区间断性和不可预知特征的降水对土壤水分特征的影响,为荒漠绿洲过渡区的生态建设和恢复提供理论依据。【方法】通过对河西走廊绿洲边缘的沙质荒漠和砾质荒漠土壤水分的长期观测,结合当地气象数据,分析降水对土壤水... 详细信息

【目的】探究干旱地区间断性和不可预知特征的降水对土壤水分特征的影响,为荒漠绿洲过渡区的生态建设和恢复提供理论依据。【方法】通过对河西走廊绿洲边缘的沙质荒漠和砾质荒漠土壤水分的长期观测,结合当地气象数据,分析降水对土壤水分特征的影响。【结果】研究区域沙质和砾质荒漠的土壤水分处于中等变异程度,沙质荒漠土壤含水量的最大值为6.61%、砾质荒漠土壤含水量的最大值为11.81%,与降水量的最大值均出现在7月,土壤水分同降水量存在正相关关系。荒漠绿洲区土壤水分在垂直空间上随着土层深度的增加,土壤水分变异系数减小,土壤水分变化由活跃逐渐趋于稳定。但降水沙质荒漠和砾质荒漠区土壤水分的影响存在显著差异,沙质荒漠土壤以自上而下的活塞式下渗为主,降水以逐层向下的方式入渗,下层土壤接受降水补给时具有滞后性。而砾质土壤各层对降水的反应迅速,能够通过大孔隙快速补给下层土壤,水分迅速入渗至深层土壤中。【结论】河西走廊绿洲边缘的土壤水分受土壤类型的影响,降水对其影响有差异,根据不同的土壤水分变化特征,科学开展生态建设和恢复,对绿洲边缘生态系统的可持续发展有重要意义。

关键词：土壤水分降水绿洲边缘沙质荒漠砾质荒漠

维普期刊数据库博看期刊

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

兰州市常见园林阔叶树种滞尘能力测定

甘肃林业科技 2020年第3期45卷 27-29页

作者：曹雪张亮付晨馨白羽欣甘肃农业大学林学院甘肃兰州730070

粉尘污染空气,影响城市居民生产生活。本文以26种兰州市园林常见阔叶树为对象,采用差重法测定叶片滞尘能力。结果表明,不同树种叶片滞尘能力差异巨大,紫叶李、紫薇、榆叶梅、毛泡桐滞尘能力优良,叶滞尘系数>0.9 g/m^2;贴梗海棠、绦柳、... 详细信息

粉尘污染空气,影响城市居民生产生活。本文以26种兰州市园林常见阔叶树为对象,采用差重法测定叶片滞尘能力。结果表明,不同树种叶片滞尘能力差异巨大,紫叶李、紫薇、榆叶梅、毛泡桐滞尘能力优良,叶滞尘系数>0.9 g/m^2;贴梗海棠、绦柳、华北珍珠梅、金叶女贞滞尘能力低下,叶滞尘系数<0.3 g/m^2;紫叶李叶片滞尘能力高达金叶女贞的6.7倍。

关键词：兰州市园林阔叶树种滞尘能力

在线全文

学校读者我要写书评

暂无评论

中国纺织服装行业绿色标准比较分析

现代纺织技术 2023年第4期31卷 11-19页

作者：何承天董廷尉付晨昕余彤倩徐雨叶翔宇王来力浙江理工大学服装学院杭州310018 浙江理工大学浙江省服装工程技术研究中心杭州310018 中国纺织经济研究中心北京100020 浙江省轻工业品质量检验研究院杭州310018 浙江省现代纺织技术创新中心浙江绍兴312000

为系统解析中国纺织服装行业的绿色标准,对现行的相关绿色标准进行了统计归类、绿色评价指标梳理和绿色指标限值比对,结果表明:现行的纺织服装行业绿色标准包括3种限制类标准(取水定额、水污染物排放限额、能耗限额)和5种鼓励类标准(节... 详细信息

为系统解析中国纺织服装行业的绿色标准,对现行的相关绿色标准进行了统计归类、绿色评价指标梳理和绿色指标限值比对,结果表明:现行的纺织服装行业绿色标准包括3种限制类标准(取水定额、水污染物排放限额、能耗限额)和5种鼓励类标准(节水型企业评价、绿色工厂评价、绿色生态类产品评价、绿色园区评价和绿色供应链评价);前四类标准的评价指标只针对某一方面绿色性能设定要求,后四类标准则为取水量、能耗、污染物排放等多维度指标综合评价;在单位产品取水量限额、单位产品废水排放量限额方面,取水定额标准和水污染物排放限额标准要求最低;在单位产品能耗限额方面,能耗限额标准、绿色工厂评价标准、绿色生态类产品评价标准对于同类产品的限额值差距较小。

关键词：纺织服装行业绿色标准水耗能耗评价指标

维普期刊数据库博看期刊

Microstructure evolution and growth mechanism of core-shell silicon-based nanowires by thermal evaporation of SiO

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第9期11卷 1417-1430页

作者： Bing LIU Jia SUN Lei ZHOU Pei ZHANG chenxin YAN Qiangang fu State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Fiber Reinforced Light Composite MaterialsNorthwestern Polytechnical UniversityXi’an 710072China

Core-shell structured SiC@SiO_(2)nanowires and Si@SiO_(2)nanowires were prepared on the surface of carbon/carbon(C/C)composites by a thermal evaporation method using SiO powders as the silicon source and Ni(NO3)2 as the *** average diameters of SiC@SiO_(2)nanowires and Si@SiO_(2)nanowires are about 145 nm,and the core-shell diameter ratios are about 0.41 and 0.53,*** SiO_(2)shells of such two nanowires resulted from the reaction between SiO and CO and the reaction of SiO itself,respectively,based on the model *** growth of these two nanowires conformed to the vapor-liquid-solid(VLS)*** this mode,CO played an important role in the growth of *** existed a critical partial pressure of CO(pC)determining the microstructure evolution of nanowires into whether SiC@SiO_(2)or Si@SiO_(2).The value of pC was calculated to be 4.01×10^(-15) Pa from the thermodynamic *** the CO partial pressure in the system was greater than the pC,SiO tended to react with CO,causing the formation of SiC@SiO_(2)***,the decomposition of SiO played a predominant role and the products mainly consisted of Si@SiO_(2)*** work may be helpful for the regulation of the growth process and the understanding of the growth mechanism of silicon-based nanowires.

关键词： SiC@SiO_(2)nanowires Si@SiO_(2)nanowires carbon/carbon(C/C)composites growth mechanism thermal evaporation

Stability of Sn-Pb mixed organic–inorganic halide perovskite solar cells:Progress,challenges,and perspectives

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

Journal of Energy Chemistry 2022年第2期31卷 371-404页

作者： Shaoshen Lv Weiyin Gao Yanghua Liu He Dong Nan Sun Tingting Niu Yingdong Xia Zhongbin Wu Lin Song chenxin Ran Li fu Yonghua Chen Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringXi’an 710072ShaanxiChina Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211816JiangsuChina School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina

The exploration of low bandgap perovskite material to approach Shockley-Queisser limit of photovoltaic device is of great significance,but it is still *** the past few years,tin–lead(Sn-Pb)mixed perovskites with low bandgaps have been rapidly developed,and their single junction solar cells have reached power conversion efficiency(PCE)over 21%,which also makes them ideal candidate as low bandgap sub-cell for tandem ***,due to the incorporation of unstable Sn^(2+),the stability issue becomes the vital problem for the further development of Sn-Pb mixed perovskite solar cells(PSCs).In this review,we are dedicated to give a full view in current understanding on the stability issue of SnPb mixed perovskites and their *** begin with the demonstration on the origin of instability of Sn-Pb mixed perovskites,including oxidation of Sn^(2+),defects,and interfacial layer induced ***,the up-to-date developments on the stability improvement of Sn-Pb mixed perovskites and their PSCs is systematically reviewed,including composition engineering,additive engineering,and interfacial *** last,the current challenges and future perspectives on the stability study of Sn-Pb mixed PSCs are discussed,which we hope could promote the further application of Sn-Pb mixed perovskites towards commercialization.

关键词： Sn-Pb mixed perovskites Stability Interfacial defects Energy level mismatch Solar cells

Effectiveness of E-SBIRT intervention in community healthcare institution in China:study proposal for a randomised controlled trial

在线全文

学校读者我要写书评

暂无评论

General Psychiatry 2021年第5期34卷 1-7页

作者： Rao fu chenxin Yuan Wei Sun Wenzheng Wang Lei Zhang Jing Zhai Qun Guan Xiaojun Wu Jiang Long Min Zhao Jiang Du Shanghai Mental Health Center Shanghai Jiao Tong University School of MedicineShanghaiChina Community Health Service Center of Jiangning Road ShanghaiChina Psychological Science Research Institute UniversitéCatholique de LouvainLouvain-la NeuveBelgium

Background Many studies have demonstrated the effectiveness of Screening,Brief Intervention and Referral to Treatment(SBIRT)in addressing substance use ***,owing to the shortage of counsellors,it has not been widely used in *** the development of smart medicine,we developed a web-based electronic SBIRT(E-SBIRT)program and explored the effectiveness of E-SBIRT in reducing substance use in *** A randomised controlled trial will be conducted in primary healthcare *** primary healthcare institutions will be selected and randomly divided into an intervention group and a control group(each institution will recruit 60 participants,and in total,240 participants will be recruited).The control group will get a pamphlet of drug abuse prevention,and the intervention group will get the E-SBIRT intervention and the *** groups will receive baseline and follow-up assessment at 1 and 3 months after the *** primary outcome is the change in scores on the Alcohol,Smoking and Substance Use Involvement Screening Test,and the secondary outcomes include changes in motivation,depression,anxiety,positive/negative emotion,self-esteem,addiction knowledge and addiction severity *** If the‘E-SBIRT’program is found to be effective,it will be an accessible,affordable and widely implementable intervention to help participants at moderate risk of substance use to reduce their *** potential benefit is to provide early intervention to high-risk patients in time and reduce the harmful consequences to individuals and society.

关键词： prevention SBIR random

The advancement of stem cell transplantation to treat acute myocardial infarction

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

海南医学 2002年第11期13卷 112-114页

作者： YANGShuixiing chenxin fu－WaiHospital Beijing100037

The current findings have provided compelling evidence that a specific opulation of cells derived from bone marrow,stem cells,might hold the key to producing functional cardiac cells in damaged hearts. This cellular therapeutics intervention reduced the infracted area and improved cardiac haemodynamics. Our rhesus monkey studies have also confirmed that stem cells transplantation therapy can improve the infarcted cardiac functions. Recent interest has focused on not only the development of stem cells as a therapeutic option in treatment of the disease,but also the mobilization of bone marrow cells repairing the infarcted heart,and try to get no immune-rejection cardiomyocyte *** objective of this review is to describe the derivation and unique properties of human ES *** emphasis well be given to summarizing recent studies that focus on the potential of human ES cells for differentiation into cardiomyocyte in vitro and in vivo,especially the advancement of stem cells transplantation for treating *** will also outline key scientific questions that will need to be answered before the full therapeutic potential of human ES cells can be used.

关键词：干细胞移植急性心肌梗塞危险性 AMI

Origin of High Efficiency and Long-Term Stability in Ionic Liquid Perovskite Photovoltaic

在线全文

学校读者我要写书评

暂无评论

Research 2020年第1期2020卷 391-403页

作者： Lingfeng Chao Tingting Niu Hao Gu Yingguo Yang Qi Wei Yingdong Xia Wei Hui Shouwei Zuo Zhaohua Zhu Chengjie Pei Xiaodong Li Jing Zhang Junfeng Fang Guichuan Xing Hai Li Xiao Huang Xingyu Gao chenxin Ran Lin Song Li fu Yonghua Chen Wei Huang Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical University127 West Youyi RoadXi’an 710072China Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(Nanjing Tech)Nanjing211816 JiangsuChina Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Physics and Electronic Science Ministry of EducationNanophotonics&Advanced Instrument Engineering Research CenterEast China Normal UniversityShanghai 200062China Institute of Applied Physics and Materials Engineering University of MacaoMacaoMacao SAR 999078China Key Laboratory for Organic Electronics&Information Displays(KLOEID)and Institute of Advanced Materials(IAM) Nanjing University of Posts and TelecommunicationsNanjing210023 JiangsuChina

Environment-friendly protic amine carboxylic acid ionic liquids(ILs)as solvents is a significant breakthrough with respect to traditional highly coordinating and toxic solvents in achieving efficient and stable perovskite solar cells(PSCs)with a simple one-step air processing and without an antisolvent treatment ***,it remains mysterious for the improved efficiency and stability of PSCs without any passivation ***,we unambiguously demonstrate that the three functions of solvents,additive,and passivation are present for protic amine carboxylic acid *** found that the ILs have the capability to dissolve a series of perovskite precursors,induce oriented crystallization,and chemically passivate the grain *** is attributed to the unique molecular structure of ILs with carbonyl and amine groups,allowing for strong interaction with perovskite precursors by forming C=O…Pb chelate bonds and N-H…I hydrogen bonds in both solution and *** finding is generic in nature with extension to a wide range of IL-based perovskite optoelectronics.

关键词： perovskite bonds breakthrough