检索结果-南通市图书馆

Structure and Electrical Properties of(Na_(0.5)Bi_(0.5))_(0.94)Ba_(0.06)TiO_3 Ceramic with 0.5 wt% of MnO

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 499-502页

作者： LIU Weihua XU Qing chen Wen chen Min KIM Bokhee School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Faculty of Advanced Materials Engineering Chonbuk National University Chonju 561756 Korea

The structure and electrical properties of （Na0.5Bi0.5）0.94Ba0.06TiO3 ceramic doped with 0.5 wt% of MnO were investigated in comparison with those of （Na0.5Bi0.5）0.94Ba0.06TiO3 ceramic. It was ascertained that the MnO addition did not cause remarkable change in crystal structure and microstructure. The MnO addition mainly displayed a hard effect on the electrical properties, an increase of coercive field （E） and mechanical quality factor （Qm） together with a decrease of dielectric constant （εr） and piezoelectric constant （d33）. An enhancement of electromechanical coupling factor （kp） with the MnO addition was obtained too. An essential relation between the piezoelectric properties and ferroelectric nature of the ceramics was detected. It was found that the piezoelectric properties of the ceramics highly depended on the corporative contribution of remanent polarization （Pt） and coercive field.

关键词： ceramics oxides crystal structure piezoelectricity ferroelectricity

Variation in reproductive life-history traits of Chinese Bulbuls(Pycnonotus sinensis)along the urbanization gradient in Hangzhou,China

在线全文

学校读者我要写书评

暂无评论

Avian Research 2023年第2期14卷 174-181页

作者： Xingmin chen Qin Zhang Sisi Lan Qin Huang Shuihua chen Yanping Wang Laboratory of Island Biogeography and Conservation Biology College of Life SciencesNanjing Normal UniversityNanjing210023China College of Chemistry and Life Sciences Zhejiang Normal UniversityJinhua321004China Zhejiang Museum of Natural History Hangzhou310012China Zhejiang Provincial Museum Hangzhou310007China

Urbanization brings new selection pressures to wildlife living in cities,and changes in the life-history traits of urban species can reflect their responses to such *** date,most of the studies investigating the impacts of urbanization on avian life-history traits are conducted in Europe and North America,while such studies are often lacking in quickly developing countries in Asia(e.g.,China).In this study,we examined the variations in reproductive life-history traits of Chinese Bulbuls(Pycnonotus sinensis)along the urbanization gradient in Hangzhou,*** detected 234 natural nests of Chinese Bulbuls and continuously monitored them in two continuous breeding seasons from 2012 to *** collected data on seven life-history traits(laying date,incubation period,nestling period,clutch size,egg volume,hatching success rate,and fledging success rate).We used infrared cameras to record the number of feedings per hour as the measure of food resources for the *** measured nest predation pressure by monitoring 148 natural breeding nests during breeding seasons and 54 artificial nests immediately after breeding *** then calculated the urbanization synthetic index(USI)as a measure of the level of urbanization and examined its relationship with the seven life-history *** found that Chinese Bulbuls laid eggs significantly earlier with increasing ***,the other six life-history traits did not vary significantly with the ***,the feeding frequency of chicks increased significantly with the USI,but the nest predation pressure of Chinese Bulbuls decreased significantly with the *** food resources and reduced nest predation pressure in cities may lead to earlier laying date of Chinese *** study should test whether the earlier laying date of Chinese Bulbuls is the result of phenotypic plasticity or genetic change.

关键词： Feeding frequency Laying date Life-history trait Nest predation Urbanization Urbanization synthetic index(USI)

Copper- and Silver-Mediated Cyanation of Aryl Iodides Using DDQ as Cyanide Source

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2013年第4期31卷 449-452页

作者： Kui Zheng Peng Yu Shuyou chen Fen chen Jiang cheng College of Chemistry & Materials Engineering Wenzhou University Wenzhou Zhejiang 325035 China School of Petrochemical Engineering Changzhou University Changzhou Jiangsu 213164 China

A new copper and silver-mediated cyanation of aryl iodides with DDQ as a cyanide source is achieved, provid- ing nitriles with good yields. This new approach represents a safe method leading to aryl nitriles.

关键词： copper silver cyanation aryl iodides DDQ

让智慧插上创造的翅膀:创造动力系统的激活及其条件

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

心理科学进展 2021年第4期29卷 707-722页

作者：张亚坤陈宁陈龙安施建农中国科学院心理研究所北京100101 中华创造力训练发展协会台北10683 北京理工大学北京100081 中国科学院大学北京100049 中国科学院行为科学重点实验室北京100101 Department of Learning and Philosophy Aalborg UniversityDenmark

创造力是一个集个人、团体、社会、文化相互交织的系统,因此创造力的培养也需要综合考虑。本文在融合以往创造力研究的基础上,建构了一套系统创造力培养的“蝴蝶理论”,创造力培养需要抓住核心来统领全局,同时兼顾创造力培养所需要统筹... 详细信息

创造力是一个集个人、团体、社会、文化相互交织的系统,因此创造力的培养也需要综合考虑。本文在融合以往创造力研究的基础上,建构了一套系统创造力培养的“蝴蝶理论”,创造力培养需要抓住核心来统领全局,同时兼顾创造力培养所需要统筹兼顾的各个部分。动力系统的激活是创造力培养的核心。新颖、适用的创造性成果的产出,需要社会文化中的个体或团体在创造性心理动力的基础上来完成。创造性心理动力有效的激活则需要一些基本条件,如在认知层面,需要具备一定的能力,如一般认知能力、思维方法的掌握、元认知以及高效的资源整合能力等;在非智力因素方面,基本心理需要的满足,个性心理的健康发展等是创造力得以发挥的必要条件,推而广之还包括:合理的社会支持、互动以及文化的包容等等。除了理论方面的整合,本文还从实践的角度分析如何激活学生的动力系统,重点分析了什么是兴趣以及如何激发个体的兴趣,因为以兴趣爱好为核心的内部动机是自主性最高的动力来源。本文从理论(创造力培养的蝴蝶理论)与实践(创造力培养的兴趣激发)两个角度为创造力培养提供了支持。

关键词： BSI 模型创造力培养的蝴蝶理论智力导入量兴趣理论失谐解困理论四向度幽默风格模型福流动态发展模型

SPLICEOSOME DISASSEMBLY CATALYZED BY A PRP43-CONTAINING COMPLEX

在线全文

学校读者我要写书评

暂无评论

SPLICEOSOME DISASSEMBLY CATALYZED BY A PRP43-CONTAINING COMP...

Health Monitoring of Long-Haul Fiber Communication System Using Chaotic OTDR

第五届海峡两岸细胞生物学学术研讨会

作者： Rong-Tsong Tsai Ru-Huei Fu Fu-lung Yeh Chi-Kang Tseng Soo-chen cheng Institute of Molecular Biology Academia Sinica NankangTaiwan Institute of Microbiology and ImmunologyNational Yang-Ming UniversityShih-PaiTaiwan

Splicing of pre-mRNA occurs via two steps of transesterification in a large ribonucleoprotein complex called the spliceosome, which is assembled through sequential interactions of U1, U2, U4/U6 and U5 snRNPs and other proteins factors. Following binding of all snRNAs, the spliceosome undergoes a major conformational rearrangement to release U1 and U4, forming new base-pairing between U2 and U6 and between U6 and

关键词：

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

China Communications 2020年第5期17卷 1-11页

作者： Mengmeng chen Mingjiang Zhang Shaoxiang chen Jianguo Zhang Senlin Yan Yuncai Wang School of Electronic Engineering Nanjing Xiaozhuang UniversityNanjing 211171China Key Lab of Advanced Transducers and Intelligent Control Systems Ministry of Education and Shanxi ProvinceTaiyuan 030024China Institute of Optoelectronic Engineering College of Physics&OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China School of Electrical and Electronic Engineering The Photonics InstituteNanyang Technological University639798Singapore School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China

A novel chaotic optical time-domain reflectometry(OTDR)-based approach was proposed for monitoring long-haul fiber communication systems with multiple fiber segments. The self-phase modulation and group velocity dispersion effects of the optical cable was considered in demonstrating the proof-of-concept experiment and simulation. In experiments, the correlation peaks are clearly obtained from the correlation trace between the reference and reflected(or scattered) light signals propagating in three optical-fiber segments. The technique affords a high spatial resolution of 2 m, and further long-haul fiber simulations indicate that the sensing distance can be more than 3300 km. Thus, the new proposed technique can be effectively applied for health monitoring of long-haul fiber communication systems.

关键词： fiber communication system chaotic signal optical time domain reflectometry

Ternary Ag/Ag3PO_(4)/MIL-125-NH2 Z-scheme heterojunction for boosted photocatalytic Cr(Ⅵ)cleanup under visible light

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第10期31卷 2645-2650页

作者： Yun-Cai Zhou Peng Wang Huifen Fu chen Zhao Chong-chen Wang Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation Beijing University of Civil Engineering and ArchitectureBeijing 100044China

The binary Ag3 P04/MIL-125-NH2(AMN-X)composites were synthesized through ion exchange-solution method,and the ternary Ag/Ag3 PO_(4)/MIL-125-NH2(AAMN-X)Z-scheme heterojunctions were prepared via the photo chemical reduction deposition *** photocatalytic hexavalent chromium(Cr(VI))sequestration over AMN-X and AAMN-X were investigated under visible ***-120 accomplished superior reduction performance due to that Ag nanoparticles(NPs)act as electrons transfer bridge to enhance the separation efficiency of photogenerated e-h+pairs,in which the reaction rates(***)were 2.77 and 124.2 fold higher than those of individual MIL-125-NH2 and Ag3 PO_(4),*** influences of different pH values,small organic acids and coexisting ions on the photocatalytic perfo rmance of AAMN-120 were also *** addition,the AAMN-120 heterojunction expressed great reusability and stability in cycling *** mechanism of photocatalytic Cr(VI)was investigated and verified through photoluminescence(PL),electrochemistry,electron spin resonance(ESR),active species capture,and Pt element deposition experiments.

关键词： MIL-125-NH2 Ag/Ag3PO4 Hexavalent chromium Z-scheme heterojunction Photocatalysis

Concise synthesis of xanthones by the tandem etherification——Acylation of diaryliodonium salts with salicylates

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2018年第6期29卷 985-988页

作者： Gaoxiaozheng Liu Chao Wu Bifeng chen Ru He Chao chen MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology Department of Chemistry Tsinghua University The Graduate School at Shenzhen Tsinghua University

An efficient synthetic method for multi-substituted xanthones was developed. The reaction of diaryliodonium salts and salicylates was employed for the preparation of the xanthones. This method proceeded through an intermolecular etherification-acylation to give target heterocycles in good yields（up to 91%）. Multi-substituted xanthones were gained by shifting the substituent of salicylates or diaryliodonium salts

关键词： Xanthone Diaryliodonium salts Etherification Acylaion Multiple substituent

The Olfactory Receptor Pseudo-pseudogene: A Potential Therapeutic Target in Human Diseases

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2018年第2期31卷 168-170页

作者： chen Zhe HUANG Zhen chen Lin Xi Institute of Pharmacy and Pharmacology University of South China

Recently, Prieto-Godino et al.[1] found that the olfactory receptor 75a （Ir75a） gene is a functional pseudo-pseudogene in Drosophila sechellia. For a long time, Ir75a has been regarded as an acetic acid receptor that detects acetic acid and induces obvious olfactory responses in olfactory sensory neurons （OSNs）f2J. Nonetheless, Prieto-Godino et al. confirmed that Ir75a lost its sensitivity to acetic acid in D. sechellia. Thus, the D. sechelfia Ir75a gene is generally recognized as a pseudogene in OSNs.

关键词： PTC A Potential Therapeutic Target in Human Diseases The Olfactory Receptor Pseudo-pseudogene