检索结果-南通市图书馆

Simulation of thermal processes in metamaterial millimeter-wave to infrared converter for millimeter-wave imager

International Journal of Modeling, Simulation, and Scientific Computing 2014年第S1期5卷 120-128页

作者： Peter S.Zagubisalo Andrey G.Paulish sergey A.Kuznetsov Novosibirsk Branch of the Institute of Semiconductor Physics Siberian Branch of Russian Academy of Sciences 2/1 pr.Akademika LavrentyevaNovosibirsk 630090Russian Federation Novosibirsk State University 2 ul.PirogovaNovosibirsk 630090Russian Federation

The main characteristics of millimeter-wave(MM-wave)image detector were simulated by means of accurate numerical modeling of thermophysical processes in a metamaterial MM-to-IR *** converter represents a multilayer structure consisting of an ultra thin resonant metamaterial absorber and a perfect emissive *** absorber consists of a dielectric self-supporting film that is metallized from both sides.A micropattern is fabricated from one *** absorption of the MM waves induces the converter heating that yields enhancement of IR emission from the emissive *** emission is detected by IR *** this contribution an accurate numerical model for simulation of the thermal processes in the converter structure was created by using COMSOL Multiphysics *** simulation results are in a good agreement with experimental results that validates the *** simulation shows that the real-time operation is provided for the converter thickness less than 3µm and time response can be improved by decreasing of the converter *** energy conversion efficiency of MM waves into IR radiation is over 80%.The converter temperature increase is a linear function of a MM-wave radiation power within three orders of the dynamic *** blooming effect and ways of its reducing are also *** model allows us to choose the ways of converter structure optimization and improvement of image detector parameters.

关键词： Metamaterials subterahertz waves terahertz waves millimeter waves highimpedance surface ultra-thin absorber focal plane array detector bolometric detectors thermodynamic modeling optical readout system

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

槲皮素填充的脂质体对电离辐射处理的大鼠胸主动脉平滑肌细胞上BK_(Ca)的作用(英文)

引用

生理学报 2009年第3期61卷 201-210页

作者： SOLOVIEV Anatoly TISHKIN sergey KYRYCHENKO sergey 乌克兰医学科学院药理和毒理学研究所基辅03057乌克兰

本文旨在研究槲皮素填充的卵磷脂脂质体(quercetin-filled phosphatidylcholine liposomes,PCL-Q)对非致死性全身电离辐射处理的大鼠胸主动脉平滑肌细胞(smooth muscle cells,SMCs)上的大电导钙离子依赖性钾通道(large conductance Ca2+-dependent K+channels,BKCa)的作用。我们使用膜片钳技术,观察到去极化阶跃脉冲刺激的SMCs上出现外向K+电流,该电流对paxilline(BKCa的一种特异性抑制剂)敏感,因此认为该电流主体为BKCa电流。相对正常对照大鼠,辐照处理大鼠SMCs的BKCa电流幅度明显减小。这种通道抑制效应在辐照后第9天表现显著,且在整个30天的实验期间是逐渐增强的。辐照处理大鼠的SMCs的血管舒张能力可能因此而减弱。在本实验中,PCL-Q有效地恢复了辐照后SMCs的BKCa功能。而PCL-Q的组分,单一的槲皮素或"空白"的脂质体(PCL)恢复BKCa功能的能力较二者的组合体有明显的减弱。上述结果表明,PCL-Q能恢复辐照处理后SMCs的BKCa正常功能。PCL-Q的保护能力可能来源于其抗氧化、修复质膜和抑制蛋白激酶C的作用。由此可见,这种脂胶囊化的黄酮类化合物——PCL-Q是一种在放射性事故急救和放疗副作用防治方面颇具前景的药物。

关键词：平滑肌辐射活性氧钾通道槲皮素脂质体蛋白激酶C

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

Biocompatibility and internalization of molecularly imprinted nanoparticles

引用

Nano Research 2016年第11期9卷 3463-3477页

作者： Francesco Canfarotta Alicia Waters Robyn Sadler Paul McGill Antonio Guerreiro Dmitri Papkovsky Karsten Haupt sergey Piletsky MIP Diagnostics Ltd. University of Leicester Fielding Johnson Building University Road Leicester LE 1 7RH UK School of Biochemistry and Cell Biology University College Cork College Road Cork Ireland GSK David Jack Centre for R&D Park Road Ware Hertfordshire SG 12 0DP UK Chemistry Department University of Leicester Leicester LE1 7RH UK Compiegne University of Technology CNRS Enzyme and Cell Engineering Laboratory Rue Roger Couttolenc CS 50319 50203 Compiegne Cedex France

Molecularly imprinted polymers （MIP） are receiving increasing attention thanks to their robustness, stability, and inexpensive manufacture compared with their bio-analogues such as antibodies. The molecular imprinting process can be defined as the generation of molecular recognition sites in a synthetic polymer. The template-derived sites created within a polymeric matrix allow MIPs （often referred as plastic antibodies） to selectively recognize and bind to the target molecule. Therefore, MIPs can be used in sensors and in separation and diagnostics. Owing to their size and functional properties, MIP nanoparticles （NPs） can potentially be used in biomedicine, but comprehensive analysis of their interaction with cells and in vitro toxicological tests must be performed first. Herein, we report the synthesis of bare and core-shell imprinted NPs using an innovative solid-phase approach and the toxicological evaluation of such NPs in different cell lines （HaCaT, MEFs, HT1080, and macrophages）. We also evaluated the influence of the protein corona on particle stability, the internalization of NPs in cells, and the influence of various surface coatings. Studies on the metabolic effects of imprinted NPs on fibroblasts showed that bare MIPs do not alter cell metabolism, whereas some issues arise when specific particle coatings are used. Furthermore, in vitro cytokine release studies revealed that macrophages were not activated in the presence of the MIPs evaluated in this study. The results suggest that MIP NPs are biocompatible, paving the way for their in vivo application.

关键词： pegylation core-shell toxicology inflammatory response particle uptake metabolism

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

Synthesis, X-ray structure and luminescent properties of Sm^(3+) ternary complex with novel heterocyclic β-diketone and 1,10-phenanthroline (Phen)

引用

Journal of Rare Earths 2011年第8期29卷 719-722页

作者： Ilya V. Taydakov Boris E. Zaitsev sergey S. Krasnoselskiy Zoya A. Starikova G. S. Petrov Institute of Plastics JSC Perovskiy proezd 35 Moscow 111024 Russian Federation People's Friendship University of Russia A. N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences

A new neutral ternary samarium complex Sm（Phen）HL3 in which Phen is 1,10-phenanthroline and HL is （1,3-bis（1,3-dimethyl-1H-pyrazol-4-yl）-1,3-propanedione） was synthesized. Molecular structure of this complex was determined by X-ray diffraction. Under UV-light this complex is demonstrated bright red luminescence （λmax=647 nm）, which was corresponding to the electric dipole 4G5/2→6H9/2 transition in Sm3＋ ion. UV-absorption, excitation and emission spectra of the title compound were investigated.

关键词： samarium pyrazole β-diketone crystal structure photoluminescence rare earths

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

Characterization and Electrochemical Properties of Nanostructured Zr-Doped Anatase TiO_2 Tubes Synthesized by Sol–Gel Template Route

引用

Journal of Materials Science & Technology 2017年第6期33卷 527-534页

作者： Denis P.Opra sergey V.Gnedenkov sergey L.Sinebryukhov Elena I.Voit Alexander A.Sokolov Evgeny B.Modin Anatoly B.Podgorbunsky Yury V.Sushkov Veniamin V.Zheleznov Institute of Chemistry Far Eastern Branch of Russian Academy of Sciences Far Eastern Federal University National Research Centre "Kurchatov Institute"

A series of nanostructured Zr-doped anatase TiO_2 tubes with the Zr/Ti molar ratio of 0.01, 0.02, 0.03, and0.09 were prepared by a sol–gel technology on a carbon fiber template. The electrochemical performance of Zr-doped anatase TiO_2 as anodes for rechargeable lithium batteries was investigated and compared with undoped titania. Tests represented that after 35-fold charge/discharge cycling at C/10 the reversible capacity of Zr-doped titania（Zr/Ti = 0.03） reaches 135 m A h g^（-1）, while the capacity of undoped titania（Zr/Ti = 0） yielded only 50 m A h g^（-1）. Based on the results of the physicochemical investigation, three reasons of improving electrochemical performance of Zr-doped titania were suggested. According to the scanning electron microscopy and transmission electron microscopy, Zr^（4＋） doping induces a decrease in nanoparticle size, which facilitates the Li＋diffusion. The Raman investigations show the more open structure of Zr-doped TiO_2 as compared to undoped titania due to changing of the unit cell parameters, that significantly affects on the reversibility of the insertion/extraction process. The electrochemical impedance spectroscopy results indicate that substitution of Zr^（4＋） for Ti^（4＋） into anatase TiO_2 has favorable effects on the conductivity.

关键词： Li-ion batteries Anatase titania Nanostructured materials Sol–gel template process Doping Electrochemical performance

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

New insights into substrate folding preference of plant OSCs

引用

Science Bulletin 2016年第18期61卷 1407-1412页

作者： Yongshuo Ma Yuan Zhou sergey Ovchinnikov Per Jr.Greisen Sanwen Huang Yi Shang Institute of Vegetables and Flowers Chinese Academy of Agricultural Sciences Key Laboratory of Biology and Genetic Improvement of Horticultural Crops of the Ministry of Agriculture Sino-Dutch Joint Laboratory of Horticultural Genomics Department of Biochemistry University of Washington Department of Modelling Novo Nordisk A/S 2760 Ml?vDenmark Agricultural Genomic Institute at Shenzhen Chinese Academy of Agricultural Sciences

Sterols and triterpenes are structurally diverse bioactive molecules generated through cyclization of linear 2,3-oxidosqualene. Based on carbocationic intermediates generated during initial substrate preorganization step, oxidosqualene cyclases （OSCs） are roughly segregated into protosteryl cation group that mainly catalyzes tetracyclic products and dammarenyl cation group which mostly generates pentacyclic products. However, in contrast to well-studied cascade of ring-forming reactions, little is known about the mechanism underlying the initial sub- strate folding process. Previously, we have identified a cucurbitadienol synthase （Bi） and its null allele bi （C393Y） from cucumber. By integration of homology modeling, residue coevolution and site-directed mutagenesis, we discover that four covarying amino acids including C393 constitute a dynamic domain that may be involved in substrate folding process for Bi. We also reveal a group of co-conserved residues that closely associated with the segregation of plant OSCs. These residues may act col- laboratively in choice of specific substrate folding inter- mediate for OSCs. Thus, engineer plant OSCs from into five-ringed producer. our findings open a door to four-ringed skeleton catalysts

关键词： Oxidosqualene cyclase Homologymodeling Residue coevolution Substrate folding

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

Room-temperature lasing from nanophotonic topological cavities

引用

Light(Science & Applications) 2020年第1期9卷 823-830页

作者： Daria Smirnova Aditya Tripathi sergey Kruk Min-Soo Hwang Ha-Reem Kim Hong-Gyu Park Yuri Kivshar Nonlinear Physics Center Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia Institute of Applied Physics Russian Academy of ScienceNizhny Novgorod 603950Russia Department of Physics Indian Institute of TechnologyDelhi 110016India Department of Physics Korea UniversitySeoul 02841Republic of Korea

The study of topological phases of light underpins a promising paradigm for engineering disorder-immune compact photonic devices with unusual *** with an optical gain,topological photonic structures provide a novel platform for micro-and nanoscale lasers,which could benefit from nontrivial band topology and spatially localized gap ***,we propose and demonstrate experimentally active nanophotonic topological cavities incorporating Ⅲ-Ⅴ semiconductor quantum wells as a gain medium in the *** observe room-temperature lasing with a narrow spectrum,high coherence,and threshold *** emitted beam hosts a singularity encoded by a triade cavity mode that resides in the bandgap of two interfaced valley-Hall periodic photonic lattices with opposite parity *** findings make a step towards topologically controlled ultrasmall light sources with nontrivial radiation characteristics.

关键词： lasing singularity narrow

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

Sub-dissociative dose ketamine administration for managing pain in the emergency department

引用

World Journal of Emergency Medicine 2018年第4期9卷 249-255页

作者： sergey Motov Jefferson Drapkin Antonios Likourezos Joshua Doros Ralph Monfort John Marshall Department of Emergency Medicine Maimonides Medical Center

BACKGROUND： We describe our experience of utilizing sub-dissociative dose ketamine （SDK） in managing a variety of acute and chronic painful conditions in the emergency department （ED）. METHODS： A descriptive study was conducted in our ED over a period of seven years （2010-2016） by retrospectively reviewing charts of patients aged 18 and older presenting to the ED with painful complaints and receiving SDK analgesia. Primary data analyses included type of SDK administration （intravenous push [IVP], short-infusion [SI] or continuous infusion [CI]）, dosing, rates of analgesic utilization before and after SDK administration, and adverse effects. RESULTS： Three hundred sixty-two patients were enrolled in the study. Mean ketamine doses given by IVP, St and CI were 26.3 rag, 23.4 rag, and 11.3 rag. The mean duration of CI was 135.87 minutes. The percentage of patients not requiring post-SDK analgesia increased by 16%, 18%, and 37% in IVP, SI and CI groups. Adverse effects were recorded for 13% of patients. CONCLUSION： SDK administered by IVP, SI, and CI in the ED for a variety of painful conditions is a feasible analgesic modality in the ED that is associated with a decrease in overall requirements of post-ketamine analgesia and opioid sparing.

关键词： Ketamine Analgesia Emergency department Sub-dissociative Infusion

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

可应用于民机空气动力设计中的数值优化方法

引用

航空学报 2014年第1期35卷 58-69页

作者： sergey PEIGIN 朱自强 Boris EPSTEIN Optimenga LTD Tel-Aviv 71720 Israel 北京航空航天大学航空科学与工程学院北京100191 Academic College of Tel-Aviv Yaffo Tel-Aviv 64044 Israel

目前民机成功设计的一个关键要素即在设计中有效地引入计算流体力学(CFD)的模拟方法和软件,特别是具有设计能力的方法和工具。本文概要地叙述了反设计、基于CFD低可信度和高可信度模型等数值优化方法的发展和应用于民机设计的历史和现状... 详细信息

目前民机成功设计的一个关键要素即在设计中有效地引入计算流体力学(CFD)的模拟方法和软件,特别是具有设计能力的方法和工具。本文概要地叙述了反设计、基于CFD低可信度和高可信度模型等数值优化方法的发展和应用于民机设计的历史和现状;简单地介绍了即将举行的空气动力优化设计计算系列研讨会;重点讨论了对可应用于民机设计的基于Navier-Stokes方程解算器的OPTIMAS的数值优化方法的要求及其构造方法,并以翼身组合体整流外形和翼身融合体(BWB)外形的算例表明其有效性,说明OPTIMAS可以成为民机日常设计的方法和工具之一。

关键词：民机计算流体力学(CFD) 反设计翼身数值优化

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

Rewilding staple crops for the lost halophytism:Toward sustainability and profitability of agricultural production systems

引用

Molecular Plant 2022年第1期15卷 45-64页

作者： Nishtha Rawat Silas Wungrampha Sneh L.Singla-Pareek Min Yu sergey Shabala Ashwani Pareek Stress Physiology and Molecular Biology Lab School of Life SciencesJawaharlal Nehru UniversityNew Delhi 110067India Plant Stress Biology International Centre for Genetic Engineering and BiotechnologyNew Delhi 110067India International Research Centre for Environmental Membrane Biology Foshan UniversityFoshan 528000China Tasmanian Institute for Agriculture University of TasmaniaHobart Tas 7001Australia National Agri-Food Biotechnology institute Mohali 140306India

Abiotic stress tolerance has been weakened during the domestication of all major staple *** salinity is a major environmental constraint that impacts over half of the world population;however,given the increasing reliance on irrigation and the lack of available freshwater,agriculture in the 21st century will increasingly become ***,global food security is critically dependent on the ability of plant breeders to create high-yielding staple crop varieties that will incorporate salinity tolerance traits and ac-count for future climate ***,we have argued that the current agricultural practices and reliance on crops that exclude salt from uptake is counterproductive and environmentally unsustainable,and thus called for a need for a major shift in a breeding paradigm to incorporate some halophytic traits that were present in wild relatives but were lost in modern crops during *** this review,we provide a comprehensive physiological and molecular analysis of the key traits conferring crop halophy-tism,such as vacuolar Na+sequestration,ROS desensitization,succulence,metabolic photosynthetic switch,and salt deposition in trichomes,and discuss the strategies for incorporating them into elite germ-plasm,to address a pressing issue of boosting plant salinity tolerance.

关键词： halophyte salinity salt sequestration tissue tolerance trichomes water use efficiency

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

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：