检索结果-南通市图书馆

Facile synthesis of PdCu nanocluster-assembled granular films as highly efficient electrocatalysts for formic acid oxidation

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

Rare Metals 2022年第8期41卷 2595-2605页

作者： Qing-Wei Ding Qing Luo Liang Lin xing-ping fu Lai-Sen Wang Guang-Hui Yue Jie Lin Qing-Shui Xie Dong-Liang Peng College of Materials Xiamen UniversityXiamen361005China fujian Provincial Key Laboratory of Eco-Inductrial Green Technology Wuyi UniversityWuyishan354300China

Developing efficient and stable bimetallic Pdbased anode electrocatalysts toward formic acid oxidation(FAO)is of great significance for commercial applications of direct formic acid fuel cells(DFAFCs).Herein,we report a facile synthesis approach to fabricate PdCu nanoclusters(NCs)catalysts with granular-film *** introduction of Cu can adjust the electronic structure and d-band center of Pd,which can improve the catalytic performance of the *** with Pd NCs catalyst,the catalytic durability and activity of PdCu NCs catalysts for FAO are greatly *** order for catalytic activity of NC metals is Pd_(85)Cu_(15)NCs>Pd_(70)Cu_(30)NCs>Pd *** maximum mass activity can be acquired with the Pd_(85)Cu_(15)NCs catalyst,which is about1.7 times that of the Pd NCs *** Pd_(85)Cu_(15)NCs catalyst still maintains the highest catalytic current density after 50 cycles,indicating that Pd_(85)Cu_(15)NCs catalyst has the best durability and electrocatalytic activity for *** work provides a new prospect for the design of highly efficient anode catalysts materials for DFAFCs.

关键词： Plasma gas-condensation method Formic acid electrooxidation Direct formic acid fuel cells(DFAFCs) PdCu nanoclusters catalyst

Fluorous Metal–Organic Frameworks with Unique Cage-in-Cage Structures Featuring Fluorophilic Pore Surfaces for Efficient C_(2)H_(2)/CO_(2)Separation

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2022年第10期4卷 3416-3425页

作者： xing-ping fu Yu-Ling Wang Xue-Feng Zhang Zhenjie Zhang Chun-Ting He Qing-Yan Liu College ofChemistry and Chemical Engineering Key Laboratory of FunctionalSmallMolecules forMinistry of EducationJiangxi Normal UniversityNanchangJiangxi 330022 Department of Ecological and Resources Engineering Fujian Key Laboratory of Eco-Industrial Green TechnologyWuyi UniversityWuyishanFujian 354300 College of Chemistry and State Key Laboratory of Medicinal Chemical Biology Nankai UniversityTianjin 300071

The similarities in molecular size and physical properties of acetylene(C_(2)H_(2))and carbon dioxide(CO_(2))produce a formidable challenge for their ***,we report two isoreticular fluorinated metal–organic frameworks(MOFs),labeled as JXNU-11(Fe2M)(M=Ni and Co),featuring unique octahedral cages encapsulated by cuboctahedral ***-11(Fe_(2)Ni)shows a record high C_(2)H_(2)-capture amount of 4.8mmol g−1 and a long C_(2)H_(2)/CO_(2)breakthrough interval time of 55 min g^(−1)in an actual breakthrough experiment based on the equimolar C_(2)H_(2)/CO_(2)mixture under ambient conditions,indicating a high-performance material for C_(2)H_(2)capture andC_(2)H_(2)/CO_(2)separation.

关键词： fluorous metal–organic frameworks C_(2)H_(2)/CO_(2)separation cage-in-cage structure fluorophilic pore cages

Loss Aware Feature Attention Mechanism for Class and Feature Imbalance Issue

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

Computers, Materials & Continua 2025年第1期82卷 751-775页

作者： Yuewei Wu Ruiling fu Tongtong xing fulian Yin College of Information and Communication Engineering Communication University of ChinaBeijing100024China State Key Laboratory of Media Convergence and Communication Communication University of ChinaBeijing100024China

In the Internet era,recommendation systems play a crucial role in helping users find relevant information from large *** imbalance is known to severely affect data quality,and therefore reduce the performance of recommendation *** to the imbalance,machine learning algorithms tend to classify inputs into the positive(majority)class every time to achieve high prediction *** can be categorized such as by features and classes,but most studies consider only class *** this paper,we propose a recommendation system that can integrate multiple networks to adapt to a large number of imbalanced features and can deal with highly skewed and imbalanced datasets through a loss *** propose a loss aware feature attention mechanism(LAFAM)to solve the issue of feature *** network incorporates an attention mechanism and uses multiple sub-networks to classify and learn *** better results,the network can learn the weights of sub-networks and assign higher weights to important *** propose suppression loss to address class imbalance,which favors negative loss by penalizing positive loss,and pays more attention to sample points near the decision *** on two large-scale datasets verify that the performance of the proposed system is greatly improved compared to baseline methods.

关键词： Imbalanced data deep learning e-commerce recommendation loss function big data analysis

The rearrangement of a steroid C20,C22-epoxide catalyzed by BF3·Et2O

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

Chinese Journal of Chemistry 1988年第1期6卷 70-76页

作者： LIU xing-ping PAN Xin-fu LI Yu-Lin Institute of Organic Chemistry,Lanzhou University,Lanzhou,LIANG Xiao-Tian Institute of Materia Medica,Chinese Academy of Medical Sciences,Beijing Institute of Organic Chemistry Lanzhou University Lanzhou Institute of Materia Medica Chinese Academy of Medical Sciences Beijing

The rearrangement of the C,C-epoxide（3a）catalyzed by BF·EtO was *** structures of 10 products obtained in this reaction（1a,1b,10,11,12 or 13,14,15,16,17 and 18）were determined and the mechanism discussed.

关键词： epoxide catalyzed by BF3 The rearrangement of a steroid C Et2O BF

De novo synthesis of atropisomeric benzofurans via Cu/SPDO complex catalyzed asymmetric formal [3 + 2] annulation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 174-180页

作者： Fan-Xiao Meng xing-Yu Wang Ka Lu Ju-Song Yang fu-Min Zhang Ai-Jun Ma Bao Du Yong-Qiang Tu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University School of Biotechnology and Health Sciences Wuyi University

Herein, the de novo synthesis of atropisomeric benzofurans through the Cu/spirocyclic-pyrrolidine-oxazoline(SPDO) complex catalyze asymmetric formal [3 + 2] cycloaddition between quinones and ynamides is explored, producing a range of structurally diverse axially chiral benzofurans in satisfactory yields with good to excellent enantioselectivities. furthermore, density functional theory calculations were applied to explain the possible reaction mechanism.

关键词： benzofuran atropisomers novel de novo synthetic strategy asymmetric formal [3 + 2] cycladdition Cu/SPDO complex DFT calculations

Single-cell omics: experimental workflow, data analyses and applications

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Life Sciences 2025年第1期68卷 5-102页

作者： Fengying Sun Haoyan Li Dongqing Sun Shaliu fu Lei Gu Xin Shao Qinqin Wang Xin Dong Bin Duan Feiyang xing Jun Wu Minmin Xiao Fangqing Zhao Jing-Dong J.Han Qi Liu Xiaohui Fan Chen Li Chenfei Wang Tieliu Shi Department of Clinical Laboratory the Affiliated Wuhu Hospital of East China Normal University (The Second People's Hospital of Wuhu City) Pharmaceutical Informatics Institute College of Pharmaceutical SciencesZhejiang University Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration (Tongji University) Ministry of EducationOrthopaedic DepartmentTongji HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji University Frontier Science Center for Stem Cells School of Life Sciences and TechnologyTongji University Translational Medical Center for Stem Cell Therapy and Institute for Regenerative Medicine Shanghai East HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji University Research Institute of Intelligent Computing Zhejiang Lab Shanghai Research Institute for Intelligent Autonomous Systems Center for Single-cell Omics School of Public HealthShanghai Jiao Tong University School of Medicine National Key Laboratory of Chinese Medicine Modernization Innovation Center of Yangtze River DeltaZhejiang University Center for Bioinformatics and Computational Biology Shanghai Key Laboratory of Regulatory Biologythe Institute of Biomedical Sciences and School of Life SciencesEast China Normal University Beijing Institutes of Life Science Chinese Academy of Sciences Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary StudiesCenter for Quantitative Biology (CQB)Peking University Zhejiang Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases Women's HospitalZhejiang University School of Medicine Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of StatisticsEast China Normal University

Cells are the fundamental units of biological systems and exhibit unique development trajectories and molecular features. Our exploration of how the genomes orchestrate the formation and maintenance of each cell, and control the cellular phenotypes of various organismsis, is both captivating and intricate. Since the inception of the first single-cell RNA technology, technologies related to single-cell sequencing have experienced rapid advancements in recent years. These technologies have expanded horizontally to include single-cell genome, epigenome,proteome, and metabolome, while vertically, they have progressed to integrate multiple omics data and incorporate additional information such as spatial sc RNA-seq and CRISPR screening. Single-cell omics represent a groundbreaking advancement in the biomedical field,offering profound insights into the understanding of complex diseases, including cancers. Here, we comprehensively summarize recent advances in single-cell omics technologies, with a specific focus on the methodology section. This overview aims to guide researchers in selecting appropriate methods for single-cell sequencing and related data analysis.

关键词： single-cell sequencing genome epigenome proteomics metabolomics multimodal spatial transcriptomics CRISPR screening

探究急诊护理干预对心肺复苏后患者康复的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国实用医药 2018年第9期13卷 158-160页

作者：邢惠萍富霞梁艳肖军新疆医科大学一附院昌吉分院急诊科 831100

目的探析急诊护理干预对心肺复苏后患者康复的影响。方法 60例心肺复苏患者,随机分为对照组和观察组,各30例。对照组使用常规护理,观察组使用急诊护理干预,观察比较两组的护理效果及不良反应发生情况。结果对照组显效11例(36.7%),有效12... 详细信息

目的探析急诊护理干预对心肺复苏后患者康复的影响。方法 60例心肺复苏患者,随机分为对照组和观察组,各30例。对照组使用常规护理,观察组使用急诊护理干预,观察比较两组的护理效果及不良反应发生情况。结果对照组显效11例(36.7%),有效12例(40.0%),无效7例(23.3%),总有效率为76.7%;观察组显效18例(60.0%),有效11例(36.7%),无效1例(3.3%),总有效率为96.7%;观察组总有效率显著高于对照组,差异有统计学意义(P<0.05)。对照组胸部不适4例(13.3%),抽搐2例(6.7%),反应迟钝5例(16.7%),不良反应发生率为36.7%;观察组胸部不适1例(3.3%),抽搐0例(0),反应迟钝0例(0),不良反应发生率为3.3%;观察组不良反应发生率显著低于对照组,差异有统计学意义(P<0.05)。结论对心肺复苏后患者使用急诊护理干预有较好的效果,能有效降低不良反应发生率,患者预后更好,应在临床中予以推行。

关键词：急诊护理干预心肺复苏康复

20,22-环氧甾醇在BF_(3)·Et_(2)O作用下重排反应的研究

在线全文

学校读者我要写书评

暂无评论

化学学报 1988年第6期46卷 561-566页

作者：刘兴平潘鑫复李裕林梁晓天兰州大学有机化学研究所兰州中国医学科学院药物研究所北京

本文研究了20,22-环氧甾醇3a在BF_(3)·Et_(2)O作用下的重排反应.鉴定了所得十种产物(1a,1b,10,11,12或13,14,15,16,17和18的结构,并讨论了这些产物的生成机理.

关键词： EIMS 甾醇固醇 Et_(2)O 重排反应无色结晶差向异构化生成机理差向异构体产物 ppm BF_(3) 环氧冰乙酸冰醋酸

在线全文

学校读者我要写书评

暂无评论

粘红酵母产L-苯丙氨酸解氨酶的研究

天津轻工业学院学报 2001年第3期16卷 30-32页

作者：赵玉星路福平杜连祥天津轻工业学院食品工程系天津300222

对粘红酵母 (Rhodotorula glutinis)产生 L -苯丙氨酸解氨酶 (PAL )的产酶条件进行了研究。结果表明粘红酵母产酶最佳条件为 :培养基 /g· L- 1 ;葡萄糖 5 .0 ,豆饼水解液 10 .0 (以氨基酸计 ) ,KH2 PO40 .5 ,p H5 .5 ;接种量 5 % ,摇... 详细信息

对粘红酵母 (Rhodotorula glutinis)产生 L -苯丙氨酸解氨酶 (PAL )的产酶条件进行了研究。结果表明粘红酵母产酶最佳条件为 :培养基 /g· L- 1 ;葡萄糖 5 .0 ,豆饼水解液 10 .0 (以氨基酸计 ) ,KH2 PO40 .5 ,p H5 .5 ;接种量 5 % ,摇瓶转速 170 r/min,2 8℃培养 15 h后添加 L -苯丙氨酸至终质量浓度 0 .5 g· L- 1 ,继续培养至 2 1h。酶比活力较以前提高了 10 m

关键词：粘红酵母 L-苯丙氨酸苯丙氨酸解氨酸产酶条件