检索结果-南通市图书馆

不同释放期缓释尿素配合一次基施对稻茬冬小麦产量及氮肥利用率的影响

在线全文

学校读者我要写书评

暂无评论

麦类作物学报 2022年第10期42卷 1231-1239页

作者：陈立钱晨诚徐东忆钱彩虹李春燕丁锦峰朱敏李天兵郭文善朱新开扬州大学江苏省作物遗传生理重点实验室/江苏省粮食作物现代产业技术协同创新中心/扬州大学小麦研究中心江苏扬州225009 教育部农业与农产品安全国际合作联合实验室江苏扬州225009 汉枫缓释肥料(江苏)有限公司江苏姜堰225510

为了探究能够匹配小麦氮素需求的最佳缓释肥一次性基施的配比,以达到精准、减次、控释的目标,设置7种新配方缓释肥(由40 d、120 d、160 d三种不同释放期的缓释尿素按照不同比例组合,M_(1)~M_(7))一次基施处理以及三个对照(现生产中主推... 详细信息

为了探究能够匹配小麦氮素需求的最佳缓释肥一次性基施的配比,以达到精准、减次、控释的目标,设置7种新配方缓释肥(由40 d、120 d、160 d三种不同释放期的缓释尿素按照不同比例组合,M_(1)~M_(7))一次基施处理以及三个对照(现生产中主推的缓释期120 d尿素一次基施、基肥和返青肥各施50%二次施用,普通尿素分4次按基肥∶分蘖肥∶拔节肥∶孕穗肥=50%∶10%∶20%∶20%施用,CK_(1)~CK_(3)),对不同处理的产量及氮肥利用效率进行了测定和分析。结果表明,新配方缓释肥(M_(1)~M_(7))处理均较CK_(1)和CK_(3)增产,以M_(5)处理产量最高,比CK_(3)、CK_(2)、CK_(1)分别高16.71%、6.29%、15.54%。M_(3)、M_(4)、M_(5)处理拔节期植株氮素积累水平较低,但成熟期植株氮素积累量显著高于其他处理,籽粒氮积累量也高于其他处理。在新配方缓释肥(M_(1)~M_(7))处理中,M_(5)处理花前氮素转运量和花后氮素积累量显著高于其他处理,氮肥表观利用率与氮肥农学效率也最高;M_(5)处理的净效益最高,比CK_(3)、CK_(2)、CK_(1)分别高21.14%、12.24%、29.36%。

关键词：释放期缓释尿素冬小麦产量氮肥利用率经济效益

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

基于元胞自动机的城市地表积水模拟研究

水土保持通报 2015年第6期35卷 182-186,191页

作者：赖泽辉包世泰陈顺清李天兵华南农业大学资源环境学院广东广州510642 广州奥格智能科技有限公司广东广州510663

[目的]对城市地表水文产汇流时空过程进行模拟研究,以期为城市排水防涝应急决策提供依据。[方法]针对城市地表覆盖破碎性和地形复杂性的特征,构建基于元胞自动机(CA)的城市地表积水模型,结合水力水文学原理定义元胞及其规则。[结果]与... 详细信息

[目的]对城市地表水文产汇流时空过程进行模拟研究,以期为城市排水防涝应急决策提供依据。[方法]针对城市地表覆盖破碎性和地形复杂性的特征,构建基于元胞自动机(CA)的城市地表积水模型,结合水力水文学原理定义元胞及其规则。[结果]与传统统计经验模型、物理模型相比,该模型避免了汇水区划分、水流路径确定、参数提取等数据预处理问题,以广州市番禺区富华东路段区域作为试验区进行参数率定及模型验证,根据规则更新每个元胞的状态参数可获得任意时刻地表积水量、径流量和水流。[结论]该CA模型可以准确模拟地表水流时空分布及其变化,模拟结果可靠、表达直观;通过雨水口不同排放量模拟和常用数学模型对比分析表明,CA城市地表积水模型在城市内涝模拟中具有良好的实用性及易操作性。

关键词：城市内涝城市地表积水元胞自动机水文模型

前列地尔对冠脉粥样硬化患者血流动力学及其血浆内源性sRAGE、esRAGE和cRAGE水平的影响研究

在线全文

学校读者我要写书评

暂无评论

医学研究杂志 2013年第5期42卷 153-156页

作者：李天兵曾春雨池祥波王红勇第三军医大学第三附属医院重庆400000 重庆市綦江区人民医院心内科

目的探究前列地尔对冠脉粥样硬化患者血流动力学及其血浆内源性sRAGE、esRAGE和cRAGE水平的影响。方法将2009年7月～2011年7月于笔者医院就诊并选择内科保守治疗的76例冠脉粥样硬化患者平均随机分入前列地尔治疗组和对照组。对照组采用... 详细信息

目的探究前列地尔对冠脉粥样硬化患者血流动力学及其血浆内源性sRAGE、esRAGE和cRAGE水平的影响。方法将2009年7月～2011年7月于笔者医院就诊并选择内科保守治疗的76例冠脉粥样硬化患者平均随机分入前列地尔治疗组和对照组。对照组采用冠脉粥样硬化常规内科保守治疗,前列地尔治疗组患者在常规内科保守治疗基础上每天采用20μg前列地尔静脉滴注治疗2周。比较两组患者的临床疗效,血流动力学指标,血脂指标和血浆内源性sRAGE、esRAGE和cRAGE水平。结果前列地尔治疗组临床疗效显著优于对照组(P0.05)。结论前列地尔能够显著改善冠脉粥样硬化患者的血流动力学指标和血浆内源性sRAGE、esRAGE和cRAGE水平。

关键词：冠状动脉粥样硬化性心脏病血流动力学内源性分泌型晚期糖基化终末产物受体(esRAGE) 可溶性晚期糖基化终末产物受体(sRAGE) 裂解型晚期糖基化终末产物受体(cRAGE)

Pyrolysis of single carbon sources in SBA-15: A recyclable solid phase synthesis to obtain uniform carbon dots with tunable luminescence

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第2期34卷 458-462页

作者： Xiaoqing Niu Weijie Zheng tianbing Song Zunhui Huang Chunlei Yang liming Zhang Wei li Huanming Xiong Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghai 200438China

Most of carbon dots(CDs) are synthesized in solutions, but the extensive use of solvents produces too much waste, needs complex purification and results in low yield. Particularly for the popular hydrothermal/solvothermal syntheses, safety issues hinder the large-scale production of CDs. Solid phase synthesis in air seems perfect to solve the above problems once for all, but nanoparticle growth in solid phase is always difficult to control. Here we suggest a new method to synthesize CDs in SBA-15 template, just by heating single carbon sources in air. Employing single carbon sources is important, which ensures both homogeneity of the nucleation and uniformity of the nanoparticle growth. The pores confinement of SBA-15 guarantees the uniform sizes of CDs, while the catalytic effect of SBA-15 accelerates the carbonization process of precursors. The products are easily extracted from the template by ethanol, and then the template can be recycled for the next synthesis after calcination. Various CDs are synthesized in this way by using different carbon sources and SBA-15 templates with different pore diameters, respectively. The results show that, the fluorescence properties of these CDs are determined by their composition and surface states, but not the particle sizes. This work opens a new avenue to synthesize uniform CDs in solid phase with high yield, low cost and tunable luminescence.

关键词： Carbon dots Solid phase synthesis SBA-15 Luminescence Uniformity

A four-compartment model for the COVID-19 infection—implications on infection kinetics,control measures,and lockdown exit strategies

在线全文

学校读者我要写书评

暂无评论

Precision Clinical Medicine 2020年第2期3卷 104-112页

作者： tianbing Wang Yanqiu Wu Johnson Yiu-Nam Lau Yingqi Yu liyu liu Jing li Kang Zhang Weiwei Tong Baoguo Jiang Peking University People’s Hospital Beijing 100044China Key Laboratory of Trauma and Neural Regeneration(Peking University) Ministry of EducationBeijing 100044China Department of Applied Biology and Chemical Technology Hong Kong Polytechnic UniversityHong KongChina Gennlife(Beijing)Technology Co Ltd BeijingChina School of Medicine Hangzhou Normal UniversityHangzhou 311121China Center for Biomedicine and Innovations Faculty of MedicineMacao University of Science and TechnologyMacaoChina

Objective:To analyse the impact and repercussions of the surge in healthcare demand in response to the COVID-19 pandemic,assess the potential effectiveness of various infection/disease control measures,and make projections on the best approach to exit from the current ***:A four-compartment model was constructed for SARS-CoV-2 infection based on the Wuhan data and validated with data collected in Italy,the UK,and the *** model captures the effectiveness of various disease suppression measures in three modifiable factors:(a)the per capita contact rate(β)that can be lowered by means of social distancing,(b)infection probability upon contacting infectious individuals that can be lowered by wearing facemasks,personal hygiene,etc.,and(c)the population of infectious individuals in contact with the susceptible population,which can be lowered by *** model was used to make projections on the best approach to exit from the current ***:The model was applied to evaluate the epidemiological data and hospital burden in Italy,the UK,and the *** control measures were identified as the key drivers for the observed epidemiological data through sensitivity *** the different lockdown exit strategies showed that a lockdown exit strategy with a combination of social separation/general facemask use may work,but this needs to be supported by intense monitoring whichwould allowre-introduction/tightening of the controlmeasures if the number of newinfected subjects increases *** and relevance:Governments should act early in a swift and decisive manner for containment *** lockdown exit will need to be monitored closely,with regards to the potential of lockdown *** mathematical model provides a framework for major pandemics in the future.

关键词： COVID-19 exit strategy population infection rates control measures

Evaluation of the efficacy and safety of hydroxychloroquine in comparison with chloroquine in moderate and severe patients with COVID-19

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

Science China(life Sciences) 2021年第4期64卷 660-663页

作者： Qiuyu li Cheng Cui Fei Xu Jianping Zhao Nan li Haichao li tianbing Wang Hua Zhang Na liu Yudong Wei Xiaoye Niu Yan Xu Jianping Dong Xueting Yao Xiaohong Wang Yahong Chen Haiyan li Chunli Song Jie Qiao Dongyang liu Ning Shen Department of Respiratory and Critical Care Medicine Peking University Third HospitalBeijing 100191China Drug Clinical Trial Center Peking University Third HospitalBeijing 100191China Deparment of Respiratory and Critical Care Medicine the First Afiliated Hospital of Nanchang UniversirNanchang 300060 China Department of Respiratory and Critical Care Medicine Tongi HospitalTongii Medical CollegeHuazhong Universiy of Science and TechnologyWuhan 430030China Research Center of Clinical Epidemiology Peking University Third HospitalBejing 100191China Department of Respiratory and Critical Care Medicine Peking University First HospitalBeijing 100034China Trauma Center Peking University People's HospitalBeijing 100044China Beijing Haidian Hospital Haidian Section of Peking University Third HospitalBeijing 100080Chima Deparment of Cardiology Peking University Third Hospital Beijing 100191China Instiute of Medical Innovation Peking University Third HospitalBejing 100191China

Dear Editor,Since December 2019,severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has been rapidly spreading *** and chloroquine are candidates for the treatment of coronavirus disease 2019(COVID-19)owing to ... 详细信息

关键词： acute respiratory patients

Molecular imaging:design mechanism and bioapplications

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第5期66卷 1336-1383页

作者： Lanlan Chen Yifan Lyu Xuan Zhang liting Zheng Qingqing li Ding Ding Fengming Chen Yihao liu Wei li Yutong Zhang Qiuling Huang Zhiqiang Wang Tiantian Xie Qiang Zhang Yingyu Sima Ke li Shuai Xu tianbing Ren Mengyi Xiong Ying Wu Jibin Song lin Yuan Huanghao Yang Xiao-Bing Zhang Weihong Tan Molecular Science and Biomedicine Laboratory(MBL) State Key Laboratory of Chemo/Biosensing and Chemomet-ricsCollege of Chemistry and Chemical EngineeringAptamer Engineering Center of Hunan ProvinceHunan UniversityChangsha 410082China Key Laboratory for Analytical Science of Food Safety and Biology(Ministry of Education) College of ChemistryFuzhou UniversityFuzhou 350108China College of Chemistry Beijing University of Chemical TechnologyBeijing 100029China The Cancer Hospital of the University of Chinese Academy of Sciences(Zhejiang Cancer Hospital) Institute of Basic Medicine and Cancer(IBMC)Chinese Academy of SciencesHangzhou 310022China Institute of Molecular Medicine(IMM) State Key Laboratory of Oncogenes and Related Genes Renji HospitalShanghai Jiao Tong University School of MedicineCollege of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China School of Chemistry and Chemical Engineering University of JinanJinan 250022China

Molecular imaging is a non-invasive method to image and analyze the concentration and activity of functional biomolecules in cells or in vivo at molecular level,and plays an increasing role in deep understanding of biological processes,early and accurate diagnosis of diseases,and evaluation of ***,numerous novel molecular imaging probes have been developed,involving every biomedical imaging modality,such as optical imaging,photoacoustic imaging,magnetic resonance imaging,single-photon-emission computed tomography,and positron emission *** this review,we summarize the development of current state-of-the-art molecular imaging *** introduce the design strategies of molecular probes and detailed imaging modalities,and highlight the properties of probes and biomedical imaging applications in cells and in vivo,including disease diagnosis,drug tracking,and imaging-guided *** we discuss the perspectives and challenges in this emerging *** expect this review could inspire more effective molecular imaging probes to be developed,achieving the goal towards clinical practices.

关键词： molecular imaging imaging probes multimodality biomedical applications diseases diagnosis

Primary reconstruction of Digital nerve defect by human acellular nerve graft

在线全文

学校读者我要写书评

暂无评论

Primary reconstruction of Digital nerve defect by human acel...

X80钢铜衬垫自动焊外根焊接头的组织与性能

2015年浙江省显微外科学会年会暨浙江省手外科学术年会

作者： Xueyuan li Haoliang Hu Janrong Fei Wang Xin tianbing Wang Peixun Zhang 宁波市第六医院手外科 Traumatic & Orthopedic department of Peking university People's University Hospital

PURPOSE:To explore the clinical feasibility and effectiveness of human acellular nerve graft for reconstruction of digital nerve defects within 5 ***:15 patients with 18 digital nerve injury with defect in the *** wound were evaluated cautiously for primary nerve allograft *** clean and mild contaminated wound were *** average nerve defectswasl8 mm(5-50 mm).All the patients underwent primary nerve repair with human acellular nerve graft and followed up 6 months to 2 *** sensory were evaluated by monofilaments and 2-point *** immune rejections such as wound delay were also *** of the patients received immunosuppressive therapy ***:According to Mackinnon-Dellon scale for stratification of 2PD criteria,9 of 18(50%) digits had excellent results,7 of 18(38.9%) had good results,2 of 18(11.1%) digits had poor ***-Weinstein monofilament testing results normal in 7 digits,good in 7 digits,fair in 2 digits and poor in 2 *** were no signs of infection and extrusion except in 1 case showed redness and swelling 3 days after surgery,which was controlled by prolonged antibiotic ***:Human acellular nervegraft is proved to be a safe and effective alternative for the reconstruction of peripheral digital nerve deficits measuring up to 50 mm,which avoid the donor site disfunction.

关键词： Allograft digital nerve nerve conduit nerve reconstruction peripheral nerve

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

机械工程材料 2023年第9期47卷 65-69页

作者：杨天冰李丹中国石油管道局工程有限公司廊坊065000 油气管道输送安全国家工程研究中心廊坊065000 中国石油天然气管道工程有限公司廊坊065000

采用铜衬垫自动焊外根焊工艺对X80钢进行焊接,研究了焊缝成形质量以及粘铜区域和未粘铜区域的铜含量、显微组织及力学性能。结果表明:焊缝成形良好,未发现裂纹、未熔合等缺陷。未粘铜区域的铜含量与母材一致,粘铜区域的铜质量分数约为0.... 详细信息

采用铜衬垫自动焊外根焊工艺对X80钢进行焊接,研究了焊缝成形质量以及粘铜区域和未粘铜区域的铜含量、显微组织及力学性能。结果表明:焊缝成形良好,未发现裂纹、未熔合等缺陷。未粘铜区域的铜含量与母材一致,粘铜区域的铜质量分数约为0.46%,渗铜深度约为0.18 mm;未粘铜区域焊缝组织主要由针状铁素体和少量的先共析铁素体组成,粘铜区域则主要是块状铁素体、粒状贝氏体以及游离铜组成。未粘铜区域和粘铜区域硬度变化趋势基本一致,焊缝根部粘铜区域的硬度略高于未粘铜区域;粘铜区域和未粘铜区域的抗拉强度分别为730,732 MPa,冲击性能基本一致,弯曲试验后均未见裂纹。焊缝根部渗铜未对接头的力学性能产生明显影响。

关键词： X80钢铜衬垫自动焊外根焊渗铜力学性能显微组织