检索结果-内蒙古大学图书馆

Fibrous and flexible electrodes comprising hierarchical nanostructure graphene for supercapacitors

MIcRO & NANO LETTERS 2020年第14期15卷 992-996页

作者： Zhang, Xiong Wang, Qian Southeast Univ Sch Mat Sci & Engn Nanjing 211189 Jiangsu Peoples R China Natl Univ Singapore Sch Design & Environm Dept Bldg Singapore 117566 Singapore

Flexible electrodes have important potential applications in energy storage of multi-functional portable electronic devices because of their powerful structural properties. Here, fibrous and flexible electrodes comprising hierarchical nanostructure graphene for use in advanced supercapacitors have been fabricated with an electrochemical deposition method in one step. Excellent electrochemical performance of the fibrous and flexible nanostructure material was achieved, with the areal capacitance of 48.83 mF cm(-2), according to the galvanostatic charge/discharge analysis at a current density of 0.199 mA cm(-2). The electrodes also showed a good cycle performance, with 91.2% of the original capacity retained after 4000 cycles. Such electrodes may provide new design opportunities for wearable electronics and energy storage applications.

关键词： nanofabrication current density nanostructured materials electrochemical electrodes graphene capacitance supercapacitors electrochemical deposition method fibrous nanostructure material flexible nanostructure material energy storage flexible electrodes hierarchical nanostructure graphene multifunctional portable electronic devices supercapacitors areal capacitance galvanostatic charge-discharge analysis current density c

来源：评论

学校读者我要写书评

暂无评论

Interfacing resistances in conducting probe atomic force microscopy with carbon nanotubes functionalised tips

引用

MIcRO & NANO LETTERS 2012年第4期7卷 343-347页

作者： Rius, G. Yoshimura, M. Toyota Technol Inst Tempaku Ku Nagoya Aichi 4688511 Japan

A comparative study for the evaluation of carbon nanotube (cNT) functionalised tips as an interface for the determination of electrical and electronic properties of the surface of materials and devices is presented. The results of current spectroscopy measurements, complemented with force-current testing, reveal a strong dependence of the establishment of tip-sample electrical contact with environmental conditions and procedure. Multiwalled cNT-mediated measurements are compared with the results by commonly used as-purchased probes, metal-coated and Si probes, upon an inert and low-resistance Au substrate. The introduction of cNTs in the tip vicinity represents a drastic advance in the conduction capability as compared with the silicon probes. Despite a certain reduction of conduction as compared with metal-coated probes, a significant improvement of tip apex durability, together with, non-invasive mechanical contact to the sample is demonstrated. The present multiwalled cNT probes are proposed as an ideal element for electronic studies at the nanometre scale by atomic force microscopy.

关键词： nanotube devices conduction reduction noninvasive mechanical contact carbon nanotube functionalised tip evaluation environmental conditions electronic property determination electrical property determination Au nanometre scale c Electrical contacts Scanning probe microscopy and related techniques material surface durability electrical contacts Fullerene, nanotube and related devices multiwalled carbon nanotube probes AFM force-current testing conduction capability atomic force microscopy tip-sample electrical contact establishment tip vicinity contact resistance tip apex durability improvement inert Au substrate conducting probe atomic force microscopy device surface spectroscopy measurements carbon nanotubes mechanical contact interfacing resistances low-resistance Au substrate electrical conductivity multiwalled carbon nanotube-mediated measurements

来源：评论

学校读者我要写书评

暂无评论

compound Hertzian chain model for copper-carbon nanocomposites' absorption spectrum

引用

MIcRO & NANO LETTERS 2011年第4期6卷 277-279页

作者： Kokabi, A. Hosseini, M. Saeedi, S. Moftakharzadeh, A. Vesaghi, M. A. Fardmanesh, M. Sharif Univ Technol Sch Elect Engn Tehran Iran Sharif Univ Technol Dept Phys Tehran Iran Bilkent Univ Dept Elect Engn Ankara Turkey

The infrared range optical absorption mechanism of carbon-copper composite thin layer coated on the diamond-like carbon buffer layer has been investigated. By consideration of weak interactions between copper nanoparticles in their network, optical absorption is modelled using their coherent dipole behaviour induced by the electromagnetic radiation. The copper nanoparticles in the bulk of carbon are assumed as a chain of plasmonic dipoles, which have coupling resonance. considering nearest neighbour interactions for this metallic nanoparticles, surface plasmon resonance frequency (omega(0)) and coupled plasmon resonance frequency (omega(1)) have been computed. The damping rate against wavelength is derived, which leads to the derivation of the optical absorption spectrum in terms of omega(0) and omega(1). The dependency of the absorption peaks to the particle size and the particle mean spacing is also investigated. The absorption spectrum is measured for different cu-c thin films with various cu particle size and spacing. The experimental results of absorption are compared with the obtained analytical ones.

关键词： Low-dimensional structures: growth, structure and nonelectronic properties nanocomposites nanoparticles copper Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials infrared spectra c metallic thin films plasmonic dipoles cu-c copper-carbon nanocomposites absorption spectrum Thin film growth, structure, and epitaxy surface plasmon resonance frequency Infrared and Raman spectra in inorganic crystals Optical properties of other inorganic semiconductors and insulators (thin films/low-dimensional structures) buffer layers surface plasmon resonance electromagnetic radiation collective excitations (surface states) particle size coupled plasmon resonance frequency infrared range optical absorption mechanism carbon diamond-like carbon buffer layer Hertzian chain model Methods of nanofabrication and processing

来源：评论

学校读者我要写书评

暂无评论

Optical and magnetic properties of transition metal oxides

引用

cURRENT OPINION IN SOLID STATE & MATERIALS ScIENcE 1998年第2期3卷 175-180页

作者： Tokura, Y Univ Tokyo Dept Appl Phys Tokyo 113 Japan

The extremely strong coupling of conduction electrons with local spins in transition metal oxides leads to many intriguing electronic and optical properties, which are currently of great interest. Among these intriguing properties, the discovery of colossal magnetoresistance in manganese oxides has sparked a number of studies on the magnetic and electronic properties of these materials as well as the exploration of the relevant new materials phase.

关键词： cMR colossal magnetoresistance FM ferromagnetic metal I insulator T c ferromagnetic transition temperature TMO transition metal oxide TMR tunneling magnetoresistance

来源：评论

学校读者我要写书评

暂无评论

cHARAcTERISTIcS OF HEPATIc MIXED-FUNcTION OXIDASE OF PIGEON, cOLUMBA-LIVIA

引用

GENERAL PHARMAcOLOGY 1975年第2-3期6卷 97-103页

作者： RUNNELS, JM KHAN, MAQ UNIV ILLINOIS DEPT BIOL SCICHICAGO CIRCLECHICAGOIL 60680

1. The microsomal mixed-function oxidase (MFO) of the pigeon liver seems to be most active around pH 6·8 (0·1 M phosphate buffer) and 45°c to epoxidize aldrin and epoxidize and hydroxylate chlordene. 2. This level of activity is higher than that reported for other avian species but lower than that for mammalian MFO. 3. The MFO system shows lower levels of cytochrome b 5 and cytochrome P-450 as reported for rats and mice; but much higher levels of NADPH-cytochrome c -reductase activity than that reported for mammals. 4. cytochrome P-450 binds aliphatic polychlorinated cyclodienes as type I and the aromatic pyridine as type II substrates.

关键词： Mixed-function-oxidase pigeon cyclodiene metabolism optima, pH 6·8, temperature 45°c cytochrome b 5 , P-450 and NADPH-cytochrome c -reductase

来源：评论

学校读者我要写书评

暂无评论

caenorhabditis elegans Gastrulation: A Model for Understanding How cells Polarize, change Shape, and Journey Toward the center of an Embryo

引用

GENETIcS 2020年第2期214卷 265-277页

作者： Goldstein, Bob Nance, Jeremy Univ N Carolina Dept Biol Chapel Hill NC 27599 USA Univ N Carolina Lineberger Comprehens Canc Ctr Chapel Hill NC 27599 USA NYU Sch Med Skirball Inst Biomol Med Helen L & Martin S Kimmel Ctr Biol & Med New York NY 10016 USA NYU Sch Med Dept Cell Biol New York NY 10016 USA

Gastrulation is fundamental to the development of multicellular animals. Along with neurulation, gastrulation is one of the major processes of morphogenesis in which cells or whole tissues move from the surface of an embryo to its interior. cell internalization mechanisms that have been discovered to date in caenorhabditis elegans gastrulation bear some similarity to internalization mechanisms of other systems including Drosophila, Xenopus, and mouse, suggesting that ancient and conserved mechanisms internalize cells in diverse organisms. c. elegans gastrulation occurs at an early stage, beginning when the embryo is composed of just 26 cells, suggesting some promise for connecting the rich array of developmental mechanisms that establish polarity and pattern in embryos to the force-producing mechanisms that change cell shapes and move cells interiorly. Here, we review our current understanding of c. elegans gastrulation mechanisms. We address how cells determine which direction is the interior and polarize with respect to that direction, how cells change shape by apical constriction and internalize, and how the embryo specifies which cells will internalize and when. We summarize future prospects for using this system to discover some of the general principles by which animal cells change shape and internalize during development.

关键词： apical constriction c elegans cell polarity cell shape gastrulation morphogenesis WormBook

来源：评论

学校读者我要写书评

暂无评论

cYK-1/Formin activation in cortical RhoA signaling centers promotes organismal left-right symmetry breaking

引用

PROcEEDINGS OF THE NATIONAL AcADEMY OF ScIENcES OF THE UNITED STATES OF AMERIcA 2021年第20期118卷 1页

作者： Middelkoop, Teije c. Garcia-Baucells, Julia Quintero-cadena, Porfirio Pimpale, Lokesh G. Yazdi, Shahrzad Sternberg, Paul W. Gross, Peter Grill, Stephan W. Max Planck Inst Mol Cell Biol & Genet D-01307 Dresden Germany Tech Univ Dresden Biotechnol Ctr D-01307 Dresden Germany Tech Univ Dresden Cluster Excellence Phys Life D-01307 Dresden Germany CALTECH Div Biol & Biol Engn Pasadena CA 91125 USA MIT Dept Mat Sci & Engn Cambridge MA 02142 USA Univ Vienna Max F Perutz Labs Vienna Bioctr A-1030 Vienna Austria

Proper left-right symmetry breaking is essential for animal development, and in many cases, this process is actomyosin-dependent. In caenorhabditis elegans embryos active torque generation in the actomyosin layer promotes left-right symmetry breaking by driving chiral counterrotating cortical flows. While both Formins and Myosins have been implicated in left-right symmetry breaking and both can rotate actin filaments in vitro, it remains unclear whether active torques in the actomyosin cortex are generated by Formins, Myosins, or both. We combined the strength of c. elegans genetics with quantitative imaging and thin film, chiral active fluid theory to show that, while Non-Muscle Myosin II activity drives cortical actomyosin flows, it is permissive for chiral counterrotation and dispensable for chiral symmetry breaking of cortical flows. Instead, we find that cYK-1/Formin activation in RhoA foci is instructive for chiral counterrotation and promotes in-plane, active torque generation in the actomyosin cortex. Notably, we observe that artificially generated large active RhoA patches undergo rotations with consistent handedness in a cYK-1/Formin-dependent manner. Altogether, we conclude that cYK-1/Formin-dependent active torque generation facilitates chiral symmetry breaking of actomyosin flows and drives organismal left-right symmetry breaking in the nematode worm.

关键词： left-right asymmetry |Formin RhoA signaling c elegans

来源：评论

学校读者我要写书评

暂无评论

carbon films as perfect electromagnetic wave absorbers and anti-reflectors

引用

MIcRO & NANO LETTERS 2017年第5期12卷 312-314页

作者： Batrakov, Konstantin Paddubskaya, Alesya Kuzhir, Polina Belarusian State Univ Inst Nucl Problems Minsk 220030 BELARUS Ryazan State Radio Engn Univ Ryazan 390005 Russia

It is shown that thin carbon coating with thicknesses, depending on its structure and porosity, ranging from tens of nanometres to tens of microns can absorb almost all incident microwave radiation without reflection. Special conditions on dielectric properties of substrate and conductivity of carbon material, which are necessary for the realisation of such a perfect absorber, are derived. The conductance of the carbon coating can then be controlled by proper porosity.

关键词： carbon thin films coatings electromagnetic wave absorption porosity electrical conductivity thin carbon coating carbon films electromagnetic wave absorbers electromagnetic wave antireflectors porosity dielectric properties electrical conductivity microwave radiation c

来源：评论

学校读者我要写书评

暂无评论

Interdigitated transducer ammonia sensors based on nanodiamond/polyaniline thin film

引用

ELEcTRONIcS LETTERS 2016年第7期52卷 542-543页

作者： Wu, Zuquan chen, Xiangdong Tian, Xin chen, Xinpeng Li, Ning Ding, Xing Southwest Jiaotong Univ Sch Informat Sci & Technol Chengdu 610031 Sichuan Peoples R China Southwest Jiaotong Univ Sch Mat Sci & Engn Minist Educ Key Lab Adv Technol Mat Chengdu 610031 Sichuan Peoples R China

The interdigitated transducers sensor based on nanodiamond (ND)/polyaniline (PANI) thin film for ammonia (NH3) sensing is investigated, which is synthesised by in situ chemical oxidative polymerisation. The experimental result reveals that the response of 30ND/PANI thin film sensor is much higher than that of PANI for NH3 gas detection. The ND is homogeneously combined into PANI to form ND/PANI nanocomposite, which may increase the specific surface area and improve the response of ND/PANI sensor. Moreover, the response mechanism of ND/PANI for NH3 gas detection is discussed. The synthesised thin films are characterised by Fourier transform infrared spectroscopy and SEM.

关键词： Fourier transform infrared spectra ammonia conducting polymers diamond gas sensors nanosensors polymer films polymerisation c Fourier transform infrared spectroscopy NH3 SEM gas detection in situ chemical oxidative polymerisation interdigitated transducer ammonia sensors nanodiamond-polyaniline thin film

来源：评论

学校读者我要写书评

暂无评论

Extrahepatic portal vein thrombosis in children and adolescents:Influence of genetic thrombophilic disorders

引用

World Journal of Gastroenterology 2010年第48期16卷 6123-6127页

作者： Andrea Pietrobattista Matteo Luciani Juan G Abraldes Manila candusso Simona Pancotti Massimo Soldati Lidia Monti Giuliano Torre Valerio Nobili Liver Unit Research InstituteBambino Gesù Children's Hospital Department of Hematology Bambino Gesù Children's Hospital Hepatic Hemodynamic Laboratory Liver UnitHospital ClínicIDIBAPS and CIBERhedUniversity of Barcelona Department of Laboratory Pediatrics Bambino Gesù Children's Hospital Radiology Department Bambino Gesù Children's Hospital

AIM:To explore the prevalence of local and genetic thrombophilic disorders as risk factors for portal vein thrombosis (PVT) in our series,the largest ever published in pediatric literature. METHODS:We conducted a case-control study enrolling 31 children with PVT and 26 age-matched controls. All were screened for thrombophilia,including genetic disorders,protein c,protein S and homocysteine deficiencies. All coagulation parameters were studied at least 3 mo after the diagnosis of portal vein ***:In our study we showed that most pediatric patients with PVT have local prothrombotic risk factors,which are probably the most important factors leading to PVT. However,there is a clear association between the presence of prothrombotic disorders and PVT,suggesting that these increase the risk of thrombosis in patients with local factors such as perinatal umbilical vein catheterization or sepsis. cONcLUSION:Patients with PVT should be screened for inherited prothrombotic disorders regardless of a history of an obvious local risk factor.

关键词： Portal vein thrombosis children Thrombophilic disorders Protein c Protein S

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：