检索结果-南通市图书馆

Design of Non-fused Ring Acceptors toward High-Performance,Stable,and Low-Cost Organic Photovoltaics

Accounts of Materials Research 2022年第6期3卷 644-657页

作者： Qing Shen Chengliang He shuixing li lijian Zuo Minmin Shi Hongzheng Chen State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationInternational Research Center for X PolymersDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027P.R.China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Hangzhou 310027P.R.China

Toward future commercial applications of organic solar cells(OSCs),organic photovoltaic materials that enable high efficiency,excellent stability,and low cost should be developed.Fused-ring electron acceptors(FREAs)have declared that OSCs are capable of showing efficiencies over 19%,whereas stability and cost are not solved yet.As the counterparts of FREAs,non-fused ring electron acceptors(NFREAs)are more flexible in molecular design.They have better stability because of the reduction of intramolecular tension via breaking fused backbone and have more advantages in cost with the reduction of synthetic complexity.However,the challenge for NFREAs is the relatively lower efficiencies(around 15%at current stage),which require better molecular designs for addressing the issues of conformational unicity and effective molecular packing.In this Account,we comprehensively summarize works about NFREAs carried out in our group from three main frameworks,including molecular design and efficiency optimization,material cost,and stability.First,in the part of molecular design and efficiency optimization,the existing rotatable single bond in NFREAs will bring the problem of conformational uncertainty,but it can be solved through proper molecular design,which also regulates the energy levels,light absorption range,and the packing mode of the molecule for obtaining higher performance.Thus,in this part,we discuss the evolution of NFREAs in three aspects,including molecular skeleton optimization,terminal modification,and side chain engineering.Many strategies are used in the design of a molecular skeleton,such as utilizing the quinoid effect,introducing functional groups with the electron push−pulling effect,and using multiple conformational lock.Furthermore,simplifying the skeleton is also the preferred development tendency.As for the terminal,the main modification strategy is adjusting the conjugation length and halogen atoms.What is more,by adjusting the side chain to induce appropriate steric hindrance,we can fix the orientation

关键词： stability fused stability

来源：

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

A non-fullerene acceptor enables efficient P3HT-based organic solar cells with small voltage loss and thickness insensitivity

引用

Chinese Chemical Letters 2019年第6期30卷 1277-1281页

作者： Ning Wang Weitao Yang shuixing li Minmin Shi Tsz-Ki Lau Xinhui Lu Rafi Shikler Chang-Zhi li Hongzheng Chen MOE Key Laboratory of Macromolecular Synthesis and Functionalization State Key Laboratory of Silicon Materials Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Department of Physics The Chinese University of Hong Kong Hong Kong 999077 China Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Beer-Sheva 8410501 Israel

Poly(3-hexylthiophene)(P3HT) is a low-cost polymer donor for organic solar cells (OSCs). However, the P3HT-based OSCs usually give low power conversion efficiencies (PCEs) due to the wide bandgap and the high-lying energy levels of P3HT. To solve this problem, in this work, we design and synthesize a new A-D-A type non-fullerene acceptor, DFPCBR, which owns an electron-donating (D) core constructed by linking a 2,5-difluorobenzene ring with two cyclopentadithiophene moieties, and two electron-accepting (A) end-groups of benzo[c][1,2,5]thiadiazole connected with 3-ethyl-2-thioxothiazolidin-4-one. Because of the strong electron-donating ability and large conjugation effect of D core, DFPCBR shows appropriate energy levels and a narrow bandgap matching well with those of P3HT. Therefore, with P3HT as the donor and DFPCBR as the acceptor, the OSCs possess broad absorption range from 350 nm to 780 nm and the reduced energy loss (Eloss) of 0.79 eV (compared with ~1.40 eV for the P3HT:PC61BM device), providing a good PCE of 5.34% with a high open-circuit voltage (VOC) of 0.80 V. Besides, we observe that the photovoltaic performances of these devices are insensitive to the thickness of the active layers:even if the active layer is as thick as 320 nm,~80%of the best PCE is maintained, which is rarely reported for fullerene-free P3HT-based OSCs, suggesting that DFPCBR has the potential application in commercial OSCs in the future.

关键词： Poly(3-hexylthiophene) Non-fullerene acceptors Organic solar cells Energy loss Thickness insensitivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Can urban forests provide acoustic refuges for birds?Investigating the influence of vegetation structure and anthropogenic noise on bird sound diversity

引用

Journal of Forestry Research 2024年第2期35卷 163-175页

作者： Zezhou Hao Chengyun Zhang Le li Bing Sun shuixing Luo Juyang liao Qingfei Wang Ruichen Wu Xinhui Xu Christopher A.Lepczyk Nancai Pei Research Institute of Tropical Forestry Chinese Academy of ForestryGuangzhou 510520People’s Republic of China School of Electronics and Communication Engineering Guangzhou UniversityGuangzhou 510006People’s Republic of China Hunan Botanical Barden Changsha 410116People’s Republic of China Guangdong Eco-Engineering Polytechnic Guangzhou 510520People’s Republic of China College of Forestry Wildlife and EnvironmentAuburn UniversityAuburnAL 36849USA

As a crucial component of terrestrial ecosystems,urban forests play a pivotal role in protecting urban biodiversity by providing suitable habitats for acoustic spaces.Previous studies note that vegetation structure is a key factor influencing bird sounds in urban forests;hence,adjusting the frequency composition may be a strategy for birds to avoid anthropogenic noise to mask their songs.However,it is unknown whether the response mechanisms of bird vocalizations to vegetation structure remain consistent despite being impacted by anthropogenic noise.It was hypothesized that anthropogenic noise in urban forests occupies the low-frequency space of bird songs,leading to a possible reshaping of the acoustic niches of forests,and the vegetation structure of urban forests is the critical factor that shapes the acoustic space for bird vocalization.Passive acoustic monitoring in various urban forests was used to monitor natural and anthropogenic noises,and sounds were classified into three acoustic scenes(bird sounds,human sounds,and bird-human sounds)to determine interconnections between bird sounds,anthropogenic noise,and vegetation structure.Anthropogenic noise altered the acoustic niche of urban forests by intruding into the low-frequency space used by birds,and vegetation structures related to volume(trunk volume and branch volume)and density(number of branches and leaf area index)significantly impact the diversity of bird sounds.Our findings indicate that the response to low and high frequency signals to vegetation structure is distinct.By clarifying this relationship,our results contribute to understanding of how vegetation structure influences bird sounds in urban forests impacted by anthropogenic noise.

关键词： Anthropogenic noise Bird sounds Urban forests Vegetation structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Advances in magnetic particle imaging and perspectives on liver imaging

引用

iliVER 2022年第4期1卷 237-244页

作者： Wei li Xiaohua Jia lin Yin Zhiyun Yang Hui Hui Jianlin li Wenhui Huang Jie Tian shuixing Zhang Department of Radiology The First Affiliated HospitalJinan UniversityNo.613Huangpu West RoadTianhe DistrictGuangzhou510627GuangdongChina CAS Key Laboratory of Molecular Imaging Institute of AutomationBeijing100190China Beijing Key Laboratory of Molecular Imaging Beijing100190China University of Chinese Academy of Sciences Beijing100080China School of Food Science and Pharmaceutical Engineering Nanjing Normal UniversityNanjing 210023China Beijing Advanced Innovation Center for Big Data-Based Precision Medicine School of Engineering MedicineBeihang UniversityBeijing100083China Zhuhai Precision Medical Center Zhuhai People's HospitalAffiliated with Jinan UniversityZhuhai519000China

Magnetic particle imaging(MPI)is an emerging technique to visualize the spatial distribution of super-paramagnetic iron oxide with high temporal–spatial resolution,high sensitivity,unlimited image depth,and true quantitative information.MPI is based on the nonlinear response of superparamagnetic iron oxide in an alter-nating magnetic field without tissue background noise.It is a promising imaging modality for various applica-tions,including vascular imaging,cell tracking,tumor imaging,and catheter navigation.Many applications of liver imaging could be improved or created with MPI.In this review,we cover the principle and construction of MPI,we evaluate the features and advantages of MPI with relation to its own rationale and via comparison with other imaging modalities,and we review MPI liver imaging applications with a view toward assisting hepatic researchers in drawing inspiration.

关键词： Magnetic particle imaging liver imaging SPIO

来源：

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

[~3H]二甲基左旋筒箭毒碱双氯甲盐(海轮碱Ⅱ)在小鼠体内的药代动力学及整体放射自显影研究

引用

核技术 1984年第2期 52-54页

作者：李水兴高汝劦蒋建强肖玉媛潘咸新上海医药工业研究院

615小鼠iV[~3H]海轮碱Ⅱ730μCi/kg,血清药-时曲线呈三项指数函数关系,按三室开放模型计算药代动力学参数,结果表明本品在体内分布非常迅速,但消除较缓慢。给药后2min,组织内放射性以肾为最高,肝、肺、膈肌、心肌、脾、腹肌、肠壁依次递... 详细信息

615小鼠iV[~3H]海轮碱Ⅱ730μCi/kg,血清药-时曲线呈三项指数函数关系,按三室开放模型计算药代动力学参数,结果表明本品在体内分布非常迅速,但消除较缓慢。给药后2min,组织内放射性以肾为最高,肝、肺、膈肌、心肌、脾、腹肌、肠壁依次递减,脑最低。尿粪内未找到代谢产物。至96h,尿内排出放射性为注入剂量的28.3±4.2％,粪内排出放射性为注入剂量的36.7±6.2％。

关键词： [~3H]二甲基左旋筒箭毒碱双氯甲盐 [~3H]海轮碱Ⅰ 药代动力学整体放射自显影

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Modulating morphology via side-chain engineering of fused ring electron acceptors for high performance organic solar cells

引用

Science China Chemistry 2019年第6期62卷 790-796页

作者： Fuwen Zhao Dan He Jingming Xin shuixing Dai Han Xue li Jiang Zhixiang Wei Wei Ma Xiaowei Zhan Yongfang li Chunru Wang Institute of Chemistry Chinese Academy of Sciences State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Department of Materials Science and Engineering College of Engineering Peking University National Center for Nanoscience and Technology

In this work, four fused ring electron acceptors(FREAs), 2F-C5, 2F-C6, 2F-C8 and 2F-C10, are developed to investigate the effect of side-chain size on the molecular properties and photovoltaic performance of FREA systematically. The elongation of side-chains in the FREAs not only improves their solubility in the processing solvent, but also enhances their miscibility with the donor PBDB-T. It helps the FREA diffuse into the donor PBDB-T during film-formation, thus leading to the decrease in domain size and domain purity from PBDB-T:2F-C5 to PBDB-T:2F-C10 blend films in sequence. The smaller domain size affords more D/A interfaces to benefit exciton dissociation and inhibit monomolecular recombination. However, severe bimolecular recombination occurs when the domain purity decreases to a critical point. Due to the dual function of the increment of side-chain length, both short-circuit current density(J_(SC)) and fill factor(FF) of devices exhibit an evolution of first increasing then decreasing from 2F-C5, 2F-C6, 2F-C8 to 2F-C10 based OSCs. The PBDB-T:2F-C8 based OSCs get a fine balance in morphology with moderate domain size as well as high domain purity simultaneously for the least charge carrier recombination, thus achieving the highest power conversion efficiency of 12.28% with the best J_(SC)(21.27 mA cm^(-2)) and FF(71.96%).

关键词： solar cells fused ring electron acceptor side-chain length morphology

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Safety and Diagnostic Image Quality of Ultravist<sup>®</sup>in an Unselected Sub-Set of Chinese Patients: Data Analyses from a Previous Post Marketing Surveillance

引用

Open Journal of Radiology 2017年第1期7卷 63-74页

作者： shuixing Zhang Changhong liang Ziping li Jary Wang Department of Radiology Guangdong General Hospital/Guangdong Academy of Medical Sciences Guangzhou China Department of Radiology The First Affiliated Hospital of Sun Yat-sen University Guangzhou China Medical & Scientific Affairs Bayer HealthCare Pharmaceuticals Beijing China

Background: Iopromide (Ultravist®) has been shown to be a very safe CM agent in previous post-marketing surveillance studies on Western and Asian populations. Our study aimed to analyse data pertaining to the safety, tolerability and diagnostic image quality of Iopromide in an unselected sub-set of the Chinese population. Methods: we analysed data for Chinese ambulatory and in-patients who received Iopromide for an imaging procedure (in accordance with the local package insert and routine clinical practice), as part of an international post-marketing surveillance study. Use of premedication was at the discretion of the attending physician. Patient demographics, clinical history, type of examination, contrast quality and tolerability, including pre-specified adverse drug reactions, were recorded. All statistical analyses were descriptive. Results: case report forms for 20,000 Chinese patients (61.3% men) were analysed, of whom 153 patients (0.77%) had risk factors for idiosyncratic contrast media reactions (at-risk group). Use of premedication, most commonly corticosteroids, was recorded for 5658 patients (28.3%) and 86 at-risk patients (56.2% of the at-risk group), respectively. The mean (±standard deviation) dose of iodine administered was 29 ± 5.5 g. During the physician’s evaluation of image parameters, contrast quality was considered to be “good” (64.7%) or “excellent” (29.3%) in the majority of patients. 571 patients (2.9%) experienced at least one adverse drug reaction [most frequently nausea (0.70%) and dysgeusia (0.62%)], which were typically transient and of mild intensity. Two serious adverse drug reactions were reported [edema (n = 1), decreased blood pressure and dyspnea (n = 1)]. The incidence of adverse drug reactions was increased in the at-risk group versus the overall patient population, and tended to reduce with premedication (mainly corticosteroids). Conclusions: Iopromide was well tolerated and proved to be an efficient contrast agent in a large, non-selected sub-set of Chinese patients und

关键词： Contrast Media Iopromide Adverse Drug Reaction Chinese Sub-Population Post-Marketing Surveillance

来源：

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

海南岛滨海沙生植物叶片功能性状分异及其与土壤因子的关系

引用

热带亚热带植物学报 2022年第5期30卷 708-717页

作者：王旭刘敬坤罗水星赵坤坤李新建中国林业科学研究院热带林业研究所广州510520 中国林业科学研究院热带林业研究所试验站海南乐东572542 国家林业和草原局中南调查规划设计院长沙410014

为探讨滨海沙生植物对环境的适应策略,对海南岛滨海沙生植物单叶蔓荆、苦郎树、马缨丹、飞机草、假马鞭、厚藤的叶片主要功能性状分异特征及其土壤因子的关系进行了研究。结果表明,热带滨海沙生植物叶片功能性状存在明显的种间分异,叶... 详细信息

为探讨滨海沙生植物对环境的适应策略,对海南岛滨海沙生植物单叶蔓荆、苦郎树、马缨丹、飞机草、假马鞭、厚藤的叶片主要功能性状分异特征及其土壤因子的关系进行了研究。结果表明,热带滨海沙生植物叶片功能性状存在明显的种间分异,叶片功能性状不仅受植物种类的影响,还受土壤因子影响;比叶面积呈现草本>灌木>藤本的规律;叶片的N/P为7.78~10.85,热带滨海沙生植物生长受土壤氮限制;叶片功能性状中Na含量的变异系数最大(18.46%~76.36%),说明不同植物对Na^(+)的吸收存在较大差异,这将影响其在滨海沙地的自然分布;比叶面积、叶干物质含量与叶片的K、Na含量呈负相关,叶N/P与土壤Na^(+)含量呈负相关,叶片Na^(+)含量与土壤有机质、全磷、全钾呈负相关,土壤盐分限制植物对氮磷的吸收,滨海沙生植物通过比叶面积变化来适应盐胁迫。因此,在滨海沙生植被恢复中,施加土壤肥力是其快速恢复的重要措施,叶片Na+含量可作为滨海沙生植物耐盐性筛选的主要指标。

关键词：沙生植物功能性状土壤化学性质适应性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

降香黄檀不同种源/家系种质差异研究

引用

种子 2022年第7期41卷 27-34,41页

作者：罗水兴郭俊誉孙冰裴男才林明平李小飞中国林业科学研究院热带林业研究所广东广州510520

本研究比较了广东、广西、海南3省10个市(县)不同产地66个家系种质间的差异,并进行相关性状和主成分分析,结果表明,10个产地66家系降香黄檀种子性状及幼苗生长具有丰富变异,种子性状变异系数为8.99%~25.28%,幼苗性状变异系数为8.49%~33.... 详细信息

本研究比较了广东、广西、海南3省10个市(县)不同产地66个家系种质间的差异,并进行相关性状和主成分分析,结果表明,10个产地66家系降香黄檀种子性状及幼苗生长具有丰富变异,种子性状变异系数为8.99%~25.28%,幼苗性状变异系数为8.49%~33.03%,种子性状中荚果千粒重(22.34%)、去翅荚果千粒重(23.8%)、出种率(20.17%)、种子千粒重(25.28%)、种子厚(14.20%)、种子发芽率(16.11%)变异系数较大,幼苗性状中幼苗高(15.71%)、根干重(22.62%)、茎干重(33.03%)、叶干重(27.87%)变异系数较大,可作为育种和优良单株选择重要性状指标。相关性分析显示,种子千粒重与荚果(长、宽、千粒重)、种子(长、宽、厚)呈显著正相关;发芽率与出种率、种子千粒重、种长、种厚呈显著正相关;苗高、地径及幼苗地上干重均与种子千粒重、种长呈显著正相关;幼苗根干重与种子性状的相关性均未达到显著水平。此外,降香黄檀种质受地理位置因素的显著影响,年均温与荚果、种子大小和种子发芽率呈显著正相关;降雨量与出种率呈显著负相关;海拔与种子千粒重、发芽率亦呈显著正相关。主成分综合评价结果表明,10个产地66个家系中表现最优的5个家系为海南东方8号、广州热林2号、广东茂名2号、广东茂名1号、海南东方11号,表现最差的5个家系为海南白沙1号、海南尖峰4号、海南白沙12号、海南尖峰2号、海南尖峰1号。

关键词：降香黄檀种质家系幼苗性状相关性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

钢管混凝土拱桥常见病害成因分析

引用

重庆交通大学学报（自然科学版） 2013年第S1期32卷 738-741,826页

作者：周水兴李威重庆交通大学土木建筑学院重庆400074 浙江省台州公路管理处浙江台州317000

针对钢管混凝土拱桥出现的管内脱空、钢管锈蚀与局部变形、吊杆锈蚀与断裂、桥梁振动强烈等常见病害,从拱桥构造、材料、施工、养护和力学等方面分析了病害成因,提出了今后钢管混凝土拱桥设计的建议。

关键词：钢管混凝土拱桥病害成因设计建议

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：