检索结果-南通市图书馆

Ion-conducting Membranes Based on Bacterial Cellulose nanofibers Modified by Poly(sodium acrylate-co-2-acrylamido-2-methylpropanesulfonic acid)

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 Polymer Science 2024年第3期42卷 333-343,I0007页

作者： Elizaveta V.Batishcheva nikolay n.Smirnov natalya V.Bobrova Maria P.Sokolova Michael A.Smirnov Institute of Macromolecular Compounds Russian Academy of SciencesBolshoy pr.31Saint Petersburg 199004Russia

Green method for preparation of ion-conducting membranes(ICM) based on bacterial cellulose nanofibers(CnF) modified by a copolymer of sodium acrylate and 2-acrylamido-2-methylpropanesulfonic acid was elaborated. FTIR and nMR data confirmed grafting of polyacrylate onto cellulose surface. Formation of porous structure of the ICM was controlled by SEM and AFM. The maximal ionic conductivity of the membranes reaches 1.5 and 3.1 mS·cm^(-1)(60 ℃ and 98% relative humidity) when they are saturated with water or H_2SO_4(1 mol·L^(-1)) electrolyte,respectively. Prepared ICM was tested as a separator in a symmetrical supercapacitor with electrodes based on polyaniline hydrogel. The assembled cell demonstrate ability to operate at high current density up to 100 A·g^(-1) maintaining specific capacitance 165 F·g^(-1). Maximal specific capacitance of 289 F·g^(-1) was achieved at current density 1 A·g^(-1). Retaining of 90% of initial capacitance after 10000 of charge-discharge cycles proves high electrochemical stability of prepared ICM.

关键词： Bacterial cellulose Ion conductivity Porous membrane Supercapacitor

Self-healable and Robust Film Based on Electroactive Polymer Brush as Electrode for Flexible Supercapacitor

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第8期42卷 1049-1059页

作者： Maria P.Sokolova Vitaly K.Vorobiov nikolay n.Smirnov Ivan S.Kuryndin natalya V.Bobrova Michael A.Smirnov Institute of Macromolecular Compounds Russian Academy of SciencesBolshoy pr.31Saint Petersburg 199004Russia

The aim of this study was to develop self-healable and robust elect roconductive film based on polyaniline copolymer for application as electrode in flexible *** this purpose,the electroconductive polymer brushes(EPB)was *** synthesis of EPB is based on graft polymerizations of acrylamide(AAm)on poly(vinyl alcohol)(PVA)with formation of PVA-PAAm polymer brush and subsequent graft copolymerization of aniline and p-phenylenediamine on PVA-PAAm resulting in formation of EPB with electroconducting copoly(aniline-co-pphenylenediamine)(PAPh DA).It was found that the ratio between PVA and PAAm at the first stage greatly influence the electrochemical performance of the *** films were prepared by casting of EPB solution with subsequent *** of electrical current distribution through the film with AFM reveal more uniform distribution of PAPhDA in EPB in comparison with reference PVA-PAPhDA and PAAm-PAPhDA *** was demonstrated that mechanical cha racteristics and electrical conductivity values of films restore at large extent after curring and self-healing under optimal relative humidity level(58%).The flexile supercapacitor cell with EPB film electrodes demon strate specific capacitance 602 mF·cm^(-2)at the current density of 1 mA·cm^(-2)and retention 94%of initial capacitance after 5000 charge/discharge cycles.

关键词： Polymer brush Polyaniline Flexible supercapacitor Self-healing Electroconducting film

在线全文

学校读者我要写书评

暂无评论

超表面:塑造光子学的未来

Science Bulletin 2024年第11期69卷 1607-1611页

作者： nikolay L.Kazanskiy Svetlana n.Khonina Muhammad A.Butt Samara national Research University Samara 443086Russia

A metasurface, often abbreviated as MS, represents a thin, artificially crafted surface consisting of an assembly of subwavelength structures that interact with light in distinct manners. Typically,smaller than the wavelength of the light they engage with, these structures empower precise management of light properties such as polarization, phase, and amplitude.

关键词： precise abbreviated 光子学

The biosynthetic pathway of the hallucinogen mescaline and its heterologous reconstruction

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2024年第7期17卷 1129-1150页

作者： Paula Berman Luis Alejandro de Haro Ana-Rita Cavaco Sayantan Panda Younghui Dong nikolay Kuzmich Gabriel Lichtenstein Yoav Peleg Hila Harat Adam Jozwiaki Jianghua Cai Uwe Heinig Sagit Meir Ilana Rogachev Asaph Aharoni Department of Plant and Environmental Sciences Weizmann Institute of ScienceRehovot 7610001Israel Life Sciences Core Facilities Weizmann Institute of ScienceRehovot 7610001Israel The Maurice and Vivienne Wohl Institute for Drug Discovery Weizmann Institute of ScienceRehovot 7610001Israel Present address:Department of Cell and Metabolic Biology Leibniz Institute of Plant BiochemistryWeinberg 306120 Halle(Saale)Germany Department of Molecular&Cellular Pharmacology University of Miami Miler School of MedicineMiamiFL 33136USA Department of Botany and Plant Sciences University of California RiversideRiversideCA 92521USA Laboratory of Plant Hormones and Development Regulation of Chongqing School of Life SciencesChongqing UniversityChongqing 401331China

Mescaline,among the earliest identified natural hallucinogens,holds great potential in psychotherapy ***,despite the existence of a postulated biosynthetic pathway for more than half a century,the specific enzymes involved in this process are yet to be *** this study,we investigated the cactus Lophophora williamsii(Peyote),the largest known natural producer of the phenethylamine *** employed a multi-faceted approach,combining de novo whole-genome and transcriptome sequencing with comprehensive chemical profiling,enzymatic assays,molecular modeling,and pathway engineering for pathway *** identified four groups of enzymes responsible for the six catalytic steps in the mescaline biosynthetic pathway,and an n-methyltransferase enzyme that n-methylates all phenethylamine intermediates,likely modulating mescaline levels in ***,we reconstructed the mescaline biosynthetic pathway in both nicotiana benthamiana plants and yeast cells,providing novel insights into several challenges hindering complete heterologous mescaline *** together,our study opens up avenues for exploration of sustainable production approaches and responsible utilization of mescaline,safeguarding this valuable natural resource for future generations.

关键词： mescaline Lophophora williamsi Peyote biosynthetic pathway de novo genome sequencing mo-lecular modeling

On the Path to High-Temperature Josephson Multi-Junction Devices

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Electromagnetic Science 2024年第3期2卷 71-78页

作者： Xu Wang Fucong Chen Zefeng Lin Shibing Tian Chunguang Li Victor Kornev nikolay Kolotinskiy Institute of Physics Chinese Academy of SciencesBeijing 100190China Faculty of Physics Lomonosov Moscow State UniversityMoscow 119991Russia

We report our progress in the high-temperature superconductor(HTS)Josephson junction fabrication process founded on utilizing a focused helium ion beam damaging technique and discuss the expected device performance attainable with the HTS multi-junction device *** the achievable high value of characteristic voltage V_(C)=I_(C)R_(n)of Josephson junctions and the ability to design a large number of arbitrary located Josephson junctions allow narrowing the existing gap in design abilities for lowtemperature superconductor(LTS)and HTS circuits even with using a single YBa_(2)Cu_(3)O_(7-x) film layer.A one-layer topology of active electrically small antenna is suggested and its voltage response characteristics are considered.

关键词： Josephson junctions High-temperature superconductors YBa_(2)Cu_(3)O_(7-x)(YBCO) Focused helium ion beam fabrication technique Josephson multi-junction devices Superconducting quantum interference device Active electrically small antenna

3,6-Bis-β-Dicarbonylsubstituted Carbazoles Bearing n-Spacers and Their Eu(III) Complexes as Immunofluorescent Labelling Agents

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Organic Chemistry 2024年第1期14卷 20-31页

作者： Dmitry E. Pugachev Georgy V. Zatonsky Tatyana S. Kostryukova Anna G. Shubina nikolay V. Vasiliev Department of Biological Microanalysis FGUP State Research Institute of Biological Engineering Moscow Russia Department of Theoretical and Applied Chemistry State University of Education Mytishchi Russia

new reagents for immunofluorescence analysis of carbazole series containing fluorinated β-dicarbonyl fragments and carboxylic substituent groups separated by spacers of different lengths from the light-gathering carbazole scaffold have been developed. The markers in complex with Eu3+ ions possess stability in the aqueous phase, intense and prolonged luminescence (τ 550 - 570 μs) with characteristic emission maxima in the region of 615 nm and excitation wavelengths in the region of 380 - 390 nm, which distinguishes them from most of the analogs used. In the study of marker conjugation with streptavidin, a reagent containing 4 - 5 europium labeling complexes based on spacer-containing carbazole tetraketone was obtained. The marker-doped silicate nanoparticles exhibit intense and long-lived luminescence in the characteristic region.

关键词： Fluorescence Immunoassay Fluorinated β-Diketones Carbazole Europium Complexes Streptavidin nanodispersions

Preface: Modern studies of variable stars

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第3期19卷 1-2页

作者： nikolay n.Samus Sheng-Bang Qian Institute of Astronomy Russian Academy of Sciences Yunnan Observatories Chinese Academy of Sciences

In this Mini-Volume, seven papers written on the basis of talks selected from those presented at the scientific conference "Modern studies of variable stars," commemorating Prof. M. A. Svechnikov(1933–2011), are published. The conference covered a variety of variable-star topics; the papers in this Mini-Volume deal with close, mainly eclipsing, binaries, Herbig Be stars and stellar molecular masers, with an accent on stellar catalogs of different kinds. We briefly review the contents of these papers.

关键词： stars variable-stars binaries-ISM general

Preface: Stars and interstellar medium

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2018年第8期18卷 1-3页

作者： nikolay n.Samus Yan Li Institute of Astronomy Russian Academy of Sciences Yunnan Observatories Chinese Academy of Sciences

This issue presents proceedings of the ＂Stars and Interstellar Medium＂ section of the All- Russian Astronomical Conference VAK-2017. Sixteen papers （selected from about 70 talks） cover dif- ferent problems related... 详细信息

关键词： stars: binaries - ISM general - ISM clouds

A new insight into the nature of seasonal variations in coordinate time series of GPS sites located near active faults

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2016年第3期10卷 560-569页

作者： Sergey V. TROFIMEnKO Victor G. BYKOV nikolay V. SHESTAKOV nikolay n. GRIB Hiroaki TAKAHASHI Institute of Tectonics and Geophysics Far Eastern Branch Russian Academy of Sciences Khabarovsk 680000 Russia north-Eastern Federal University Neryungri 678960 the Republic of Sakha (Yakutia) Russia Institute for Applied Mathematics Far Eastern Branch Russian Academy of Sciences Vladivostok 690041 Russia Far Eastern Federal University Vladivostok 690041 Russia Institute of Seismology and Volcanology Graduate School of Science Hokkaido University Sapporo 060-0810 Japan

This study provides new insights into the nature of seasonal variations in coordinate time series of GPS sites located near active faults and methods of their modeling. Monthly averaged coordinate time series were analyzed for several pairs of collocated GPS sites situated near the active fault intersection area, in close proximity to the central part of the northern boundary of the Amurian plate and the vicinity of the San Andreas Fault zone. It is concluded that the observed seasonal variations are best described by a breather function which is one of the solutions of the well-known sine-Gordon equation. The obtained results suggest that, in this case, the source of seasonal variations may be caused by the appearance of solitary strain waves in the fault intersection system, which may be qualitatively treated as standing waves of compression-extension of the geological medium. Based on statistical testing, the limits of applicability of the suggested model have been established.

关键词： space geodetic surveys oscillatory move-ments of crustal blocks seasonal variations Amurianmicroplate