检索结果-南通市图书馆

A low-cost wide bandgap polymer based on carboxylate substituted thiazole enables efficient organic solar cells with remarkable batch-to-batch reproducibility

引用

Science China Chemistry 2024年

作者： Xiaodong Zhu yuchen lei Jianhong Gao Yanjun He Jinsicheng Liu Qian Guo Xiang Gao Liwei Xiong Xunchang Wang Renqiang Yang Zhitian Liu Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsSchool of Materials Science and EngineeringWuhan Institute of Technology Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education) School of Optoelectronic Materials&TechnologyJianghan University

Constructing the low-cost, high-efficiency, and good batch-to-batch reproducibility polymer donor is vitally important for the application of organic solar cells. Herein, we develop a structurally simple carboxylate-substituted thiazole as an electronwithdrawing building block to construct a low-cost polymer, PBTTzE, containing a facilely prepared chlorinated benzo[1,2-b:4,5-b′]dithiophene(BDTCl) donor unit. Benefiting from synergistic electron deficient effects of chlorination and ester group and C=N, as well as the noncovalent interaction of S···O and S···N, PBTTzE exhibits a deep HOMO energy level(-5.59 eV),and a planar skeleton structure. When combined with the IT-4F acceptor, the polymer(54 kDa) demonstrated a champion PCE of15.87%, which is the highest value in the IT-4F-based binary devices to date. Moreover, PBTTzE exhibits excellent batch-tobatch reproducibility due to its very similar PCEs within a range of 43–76 kDa. In addition, an alloyed state and complementary absorption can be formed between PM6 and PBTTzE. Therefore, in a ternary device with PBTTzE added to the PM6:BTP-eC9blend, a top PCE of 18.76% is achieved due to the suppressed energy loss, prolonged exciton diffusion distance, and improved charge transport. Our work demonstrates that the carboxylate-substituted thiazole is a highly promising acceptor unit for constructing low-cost and high-performance polymers.

关键词：

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

DBC陶瓷板基材表面黄斑的成因分析

引用

印制电路信息 2024年第S1期32卷 316-318页

作者：雷雨辰西安微电子技术研究所陕西西安710600

DBC陶瓷板基材黄斑是陶瓷基板的常见问题,本文以自研的黄斑褪色溶液为基础,通过对黄斑褪色过程中的形貌进行能谱分析以及金相剖切,研究DBC基材出现黄斑的原因。结果表明,黄斑是在DBC制板时铜箔氧化层与陶瓷粉内的特定杂质在二者界面形... 详细信息

DBC陶瓷板基材黄斑是陶瓷基板的常见问题,本文以自研的黄斑褪色溶液为基础,通过对黄斑褪色过程中的形貌进行能谱分析以及金相剖切,研究DBC基材出现黄斑的原因。结果表明,黄斑是在DBC制板时铜箔氧化层与陶瓷粉内的特定杂质在二者界面形成的一层极薄的共融层。基材黄斑处实质上含有一层极薄的铜,对产品的可靠性会存在一定的影响。

关键词： DBC 黄斑烧制共晶反应

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

北京市通州区中小学生家庭食物环境健康水平及相关因素

引用

中国学校卫生 2024年第5期45卷 665-668页

作者：江南雷宇宸吴燕芳孙文韬北京市通州区疾病预防控制中心营养与食品卫生科 101100

目的了解通州区中小学生家庭食物环境健康水平及其相关因素,为开展通州区中小学生家庭食物环境提升工作提供参考。方法于2021—2023年采用分层整群抽样方法,对通州区11所学校的1485个学生家庭进行问卷调查。采用单因素分析比较不同人口... 详细信息

目的了解通州区中小学生家庭食物环境健康水平及其相关因素,为开展通州区中小学生家庭食物环境提升工作提供参考。方法于2021—2023年采用分层整群抽样方法,对通州区11所学校的1485个学生家庭进行问卷调查。采用单因素分析比较不同人口学背景下家庭食物环境健康水平差异,相关因素分析采用二元多因素Logistic回归模型。结果通州区中小学生家庭食物环境健康水平得分(四分位间距)中位数为64.32(12.28)分,总达标率(≥60分)为67.41%;家庭喂养模式的健康水平得分[58.33(11.11)分]及达标率(42.76%)在家庭食物环境的5个维度中排名最后。乡镇家庭(OR=1.78,95%CI=1.41~2.25)、初中(OR=1.42,95%CI=1.07~1.87)和高中(OR=2.28,95%CI=1.73~3.00)学生家庭、单亲家庭(OR=1.89,95%CI=1.15~3.10)以及家长肥胖体型(OR=1.81,95%CI=1.23~2.65)的学生家庭食物环境健康水平未达标的风险更高(P值均<0.05)。结论通州区中小学生家庭食物环境总体健康水平不容乐观,家庭喂养模式健康水平亟待改善。应采取针对性措施以有效提升家庭食物环境健康水平,促进儿童青少年的健康成长。

关键词：家庭膳食环境回归分析学生

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

北京市通州区农村成年居民维生素D营养状况分析

引用

实用预防医学 2024年第5期31卷 543-546页

作者：江南唐晓敏雷宇宸赵春艳北京市通州区疾病预防控制中心北京101100

目的了解北京市通州区农村成年居民维生素D营养状况及影响因素。方法采用分层整群抽样方法,随机抽取北京市通州区3所乡镇共6个行政村常住居民开展问卷调查、体格检查和静脉血液样本采集工作,采用高效液相色谱-串联质谱法测定居民血清2... 详细信息

目的了解北京市通州区农村成年居民维生素D营养状况及影响因素。方法采用分层整群抽样方法,随机抽取北京市通州区3所乡镇共6个行政村常住居民开展问卷调查、体格检查和静脉血液样本采集工作,采用高效液相色谱-串联质谱法测定居民血清25-(OH)D含量,评估维生素D营养状况,采用多元有序logistic回归模型探索维生素D不足或缺乏影响因素。结果最终完成调查居民共534人,居民血清25-(OH)D总体成正偏态分布,中位数16.60(12.70,22.03)ng/ml。农村居民维生素D不足率和缺乏率分别为48.50%(259/534)和18.91%(101/534);多因素回归分析显示,具有女性(OR=2.413,95%CI:1.725~3.380)、18~44岁年龄段(OR=1.842,95%CI:1.090~3.114)、超重(OR=1.605,95%CI:1.013~2.545)和肥胖(OR=1.696,95%CI:1.017~2.824)等特征的农村成年居民维生素D营养不足或缺乏的风险更高。结论北京市通州区农村成年居民维生素D营养状况不容乐观,应重点关注农村女性、中青年、超重肥胖群体的维生素D不足和缺乏。

关键词：农村地区维生素D 成年人影响因素

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

In situ atomic-scale tracking of unusual interface reaction circulation and phase reversibility in(de)potassiated alloy-typed anode

引用

Journal of Energy Chemistry 2024年第8期95卷 241-249,I0006页

作者： Lin Su Ruining Fu Shuangying lei yuchen Pan Chongyang Zhu Pengcheng Liu Feng Xu SEU-FEI Nano-Pico Center Key Laboratory of MEMS of the Ministry of EducationSoutheast UniversityNanjing210096China

Alloy-typed anode materials,endowed innately with high theoretical specific capacity,hold great promise as an alternative to intercalation-typed counterparts for alkali-ion *** tremendous efforts devoted to addressing drastic volume change and severe pulverization issues of such anodes,the underlying mechanisms involving dynamic phase evolutions and reaction kinetics have not yet been fully ***,taking antimony(Sb)anode as a representative paradigm,its microscopic operating mechanisms down to the atomic scale during live(de)potassiation cycling are systematically unraveled using in situ transmission electron *** reversible phase transformations at single-particle level,that are Sb←→KSb_(2)←→KSb←→K_5Sb_(4)←→K_(3)Sb,were revealed during ***,multiple phase interfaces associated with different reaction kinetics coexisted and this phenomenon was properly elucidated in the context of density functional theory ***,previously unexplored unidirectional circulation of reaction interfaces within individual Sb particle is confirmed for both potassiation and *** on the empirical results,the surface diffusion-mediated potassiation-depotassiation pathways at single-particle level are *** work affords new insights into energy storage mechanisms of Sb anode and valuable guidance for targeted optimization of alloy-typed anodes(not limited to Sb)toward advanced potassium-ion batteries.

关键词： Alloy-typed anode Potassium storage mechanism In situ transmission electron microscopy Reaction interface

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

Understanding the factors influencing cloud-core vertical accelerations during deep convection formation in the WRF model

引用

Atmospheric and Oceanic Science Letters 2024年第3期17卷 1-7页

作者： Na Li Jin Wang Lingkun Ran lei Yin Xiba Tang yuchen Liu Institute of Atmospheric Physics Chinese Academy of SciencesBeijingChina Guizhou Meteorological Bureau GuiyangChina University of Chinese Academy of Sciences BeijingChina Nanjing University of Posts and Telecommunications NanjingChina Yunnan Key Laboratory of Meteorological Disasters and Climate Resources in the Great Mekong Subregion Yunnan UniversityKunmingChina

本文将扰动气压利用一个线性诊断关系代替,重新推导了WRF模式框架地形追随坐标系下的垂直动量方程,建立了垂直加速与对流触发(DCI)影响因子(如温度,水汽等)的直接联系.研究发现,DCI过程与对流核垂直加速相关,三维副散,扰动位势在垂直方... 详细信息

本文将扰动气压利用一个线性诊断关系代替,重新推导了WRF模式框架地形追随坐标系下的垂直动量方程,建立了垂直加速与对流触发(DCI)影响因子(如温度,水汽等)的直接联系.研究发现,DCI过程与对流核垂直加速相关,三维副散,扰动位势在垂直方向的二阶非均匀性,扰动位温垂直梯度,比湿及其垂直梯度,水凝物拖曳,均是能够直接影响垂直加速和对流触发的物理因子,这些量与模式基本预报量相关,通过解析基本预报量对对流发展的直接影响,可能有助于理解模式对DCI过程预测失败的原因.

关键词：垂直加速深对流垂直速度冰雹

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

Dynamic imaging through scattering medium under white-light illumination [Invited]

引用

Chinese Optics Letters 2024年第6期22卷 46-51页

作者： Junyao lei Hui Chen Yuan Yuan Yunong Sun Jianbin Liu Huaibin Zheng yuchen He Electronic Material Research Laboratory Key Laboratory of the Ministry of Education and International Centre for Dielectric ResearchXi’an Jiaotong UniversityXi’an 710049China

Imaging objects hidden behind turbid media is of great scientific importance and practical value, which has been drawing a lot of attention recently. However, most of the scattering imaging methods rely on a narrow linewidth of light, limiting their application. A mixture of the scattering light from various spectra blurs the detected speckle pattern, bringing difficulty in phase retrieval. Image reconstruction becomes much worse for dynamic objects due to short exposure times. We here investigate non-invasively recovering images of dynamic objects under white-light irradiation with the multi-frame OTF retrieval engine (MORE). By exploiting redundant information from multiple measurements, MORE recovers the phases of the optical-transfer-function (OTF) instead of recovering a single image of an object. Furthermore, we introduce the number of non-zero pixels (NNP) into MORE, which brings improvement on recovered images. An experimental proof is performed for dynamic objects at a frame rate of 20 Hz under white-light irradiation of more than 300 nm bandwidth.

关键词： scattering imaging white light illumination phase retrieval algorithm

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

Tunable optical topological transitions of plasmon polaritons in WTe_(2) van der Waals films

引用

Light(Science & Applications) 2023年第9期12卷 1807-1817页

作者： Yuangang Xie Chong Wang Fucong Fei Yuqi Li Qiaoxia Xing Shenyang Huang yuchen lei Jiasheng Zhang lei Mu Yaomin Dai Fengqi Song Hugen Yan State Key Laboratory of Surface Physics Key Laboratory of Micro and NanoPhotonic Structures(Ministry of Education)and Department of PhysicsFudan University200433 ShanghaiChina Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of Technology100081 BeijingChina Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of Technology100081 BeijingChina National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructuresand College of PhysicsNanjing University210093 NanjingChina Atom Manufacturing Institute(AMI) 211805 NanjingChina Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of PhysicsNanjing University211805 NanjingChina

Naturally existing in-plane hyperbolic polaritons and the associated optical topological transitions,which avoid the nano-structuring to achieve hyperbolicity,can outperform their counterparts in artificial *** plasmon polaritons are rare,but experimentally revealed recently in WTe_(2)van der Waals thin *** from phonon polaritons,hyperbolic plasmon polaritons originate from the interplay of free carrier Drude response and interband transitions,which promise good intrinsic ***,tunable in-plane hyperbolic plasmon polariton and its optical topological transition of the isofrequency contours to the elliptic topology in a natural material have not been *** we demonstrate the tuning of the optical topological transition through Mo doping and *** optical topological transition energy is tuned over a wide range,with frequencies ranging from 429 cm^(−1)(23.3 microns)for pure WTe_(2)to 270 cm^(−1)(37.0 microns)at the 50%Mo-doping level at 10 ***,the temperature-induced blueshift of the optical topological transition energy is also revealed,enabling active and reversible ***,the localized surface plasmon resonance in skew ribbons shows unusual polarization dependence,accurately manifesting its topology,which renders a reliable means to track the topology with far-field *** results open an avenue for reconfigurable photonic devices capable of plasmon polariton steering,such as canaling,focusing,and routing,and pave the way for low-symmetry plasmonic nanophotonics based on anisotropic natural materials.

关键词： topological transitions polar

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

Metarelation2vec:A Metapath-Free Scalable Representation Learning Model for Heterogeneous Networks

引用

Tsinghua Science and Technology 2024年第2期29卷 553-575页

作者： lei Chen Yuan Li Yong lei Xingye Deng School of Information and Electrical Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Computer Science and Engineering Hunan University of Science and TechnologyXiangtan 411201China

Metapaths with specific complex semantics are critical to learning diverse semantic and structural information of heterogeneous networks(HNs)for most of the existing representation learning ***,any metapaths consisting of multiple,simple metarelations must be driven by domain *** sensitive,expensive,and limited metapaths severely reduce the flexibility and scalability of the existing models.A metapath-free,scalable representation learning model,called Metarelation2vec,is proposed for HNs with biased joint learning of all metarelations in a bid to address this ***,a metarelation-aware,biased walk strategy is first designed to obtain better training samples by using autogenerating cooperation probabilities for all metarelations rather than using expert-given ***,grouped nodes by the type,a common and shallow skip-gram model is used to separately learn structural proximity for each node ***,grouped links by the type,a novel and shallow model is used to separately learn the semantic proximity for each link ***,supervised by the cooperation probabilities of all meta-words,the biased training samples are thrown into the shallow models to jointly learn the structural and semantic information in the HNs,ensuring the accuracy and scalability of the *** experimental results on three tasks and four open datasets demonstrate the advantages of our proposed model.

关键词： metarelation random walk heterogeneous network metapath representation learning

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

Two-Stage Online Debiased Lasso Estimation and Inference for High-Dimensional Quantile Regression with Streaming Data

引用

Journal of Systems Science & Complexity 2024年第3期37卷 1251-1270页

作者： PENG Yanjin WANG lei School of Statistics and Data Science KLMDASRLEBPS and LPMCNankai UniversityTianjin 300071China

In this paper,the authors propose a two-stage online debiased lasso estimation and statistical inference method for high-dimensional quantile regression(QR)models in the presence of streaming *** the first stage,the authors modify the QR score function based on kernel smoothing and obtain the online lasso smoothed QR estimator through iterative *** estimation process only involves the current data batch and specific historical summary statistics,which perfectly accommodates to the special structure of streaming *** the second stage,an online debiasing procedure is carried out to eliminate biases caused by the lasso penalty as well as the accumulative approximation error so that the asymptotic normality of the resulting estimator can be *** authors conduct extensive numerical experiments to evaluate the performance of the proposed *** experiments demonstrate the effectiveness of the proposed method and support the theoretical *** application to the Beijing PM2.5 Dataset is also presented.

关键词： Adaptive tuning asymptotic normality debiased lasso online updating quantile regres-sion

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：