检索结果-南通市图书馆

Hydroxyapatite composites with carbon allotropes:Preparation,properties,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

Particuology 2024年第5期88卷 239-265页

作者： Boris I.Kharisov Oxana V.Kharissova Lucy T.González Yolanda Peña Méndez Igor e.Uflyand Idalia Gómez de la Fuente Universidad Autónoma de Nuevo León Ave.UniversidadCiudad UniversitariaSan Nicolás de los GarzaNuevo León 66455Mexico Tecnologico de Monterrey Escuela de Ingeniería y CienciasMonterreyNuevo Leon 64890Mexico Department of Chemistry Southern Federal UniversityRostov-on-DonRussia

Hydroxyapatite(HA)and its composites with inorganic additives,dopants,and polymers is a rapidly developing branch in the materials *** particular,carbon allotropes are widely used in these composites being widely applied for medical *** a gap of insufficient generalization of recent achievements in the field of the HA/Carbon composites,in this review we present the state of the art of the field of HA composites and hybrids with classic carbon allotropes and *** composites are known for carbon nanotubes,nanofibers,graphene and its oxidized forms,as well as,in a lesser grade,for graphite,fullerenes,nanodiamonds,carbon nanofoams,*** composites can be fabricated by a variety of classic and less-common methods,such as co-precipitation(with or without ultrasonic treatment),CVD,hot isostatic pressing,hydrothermal,spark plasma sintering,biomimetic mineralization,thermal and plasma spray,electrochemical and electrophoretic deposition,self-assembling,3D printing,electrospinning,and lyophilisation,among *** of various synthesis techniques can be also carried out for composite *** or synthetic HA can be used as it is for further interaction with carbon allotropes or it can be first prepared and then reacted with carbon counterpart;similarly,carbon allotropes can be introduced into the interaction with HA directly or they can be first synthesized,in particular from *** biocompatible composites can be produced in the form of coatings,powders,and scaffolds and can additionally contain quantitative amounts of third phases,frequently natural or synthetic *** these composites,especially with O-containing functionalizing groups,HA disadvantages could be considerably decreased with simultaneous enhancement of mechanical properties,becoming similar to human bone,chemical stability and biocompatibility,as well as possessing antibacterial ***→G reduction and higher HA decoration were obs

关键词： Hydroxyapatite Carbon nanotubes Graphene Quantum dots Fullerenes Nanodiamonds

Helping the First Lady Just Say“No.”

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国翻译 1996年第5期 62-63页

作者： Paul kennedy

And you think you get a lot of junk mail. Just be glad you don’t have to dcal with what the postman brings First Lady Hillary Rodham Clinton every day.

关键词： Lady No Helping the First Lady Just Say

维普期刊数据库

＂Scar＂： A Social Metaphor for Working Through Revolution Trauma

在线全文

学校读者我要写书评

暂无评论

Frontiers of Literary Studies in China-Selected Publications from Chinese Universities 2016年第2期10卷 318-342页

作者： Min YANG don Kuiken Chinese Program Sarah Lawrence College New York NY 10708 USA Department of Psychology University of Alberta Edmonton Alberta T6G 2E9 Canada

This article examines the social and psychological function of the ＂scar＂ metaphor at the turn from the late 1970s to the early 1980s. We propose that the widely employed scar metaphor, which was first created in the scar literature movement of the late 1970s and early 1980s, enabled Chinese readers to ＂work through＂ the blend of psychological and ideological disquietude that lingered after the Cultural Revolution. We will first clarify how the scar metaphor facilitated this process of ＂working through,＂ using as an example Lu Xinhua＇s ＂The Scar＂（Shanghen）. We will then describe how the scar metaphor became dispersed throughout Chinese popular culture and enabled a broad spectrum of Chinese readers to participate in a similar process. At both levels of analysis, we will argue that the scar metaphor simultaneously provides a literary space for working through personal trauma and related anxieties about the ideological transition during this socio-political change.

关键词： scar metaphor scar literature metaphorical thinking revolutiontrauma working through expressive enactment

Selective toxicity of hydroxyl-rich carbon nanodots for cancer research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第4期11卷 2204-2216页

作者： Tak H. Kim Joseph P. Sirdaarta Qian Zhang ehsan eftekhari James St. John Derek kennedy Ian e. Cock Qin Li Queensland Micro and Nano Technology Center & School of engineering Griffith University 170 Kessels Rd Nathan OLD 4111 Australia Australian Rivers Institute & School of Natural Sciences Griffith University 170 Kessels Rd Nathan QLD 4111 Australia Griffith Institute for Drug Discovery Gfiffith University 46 Don Young Rd Nathan QLD 4111 Australia Menzies Health Institute Queensland Griffith University Parkland Drive Southport QLD 4222 Australia

The toxicity of nanoparticles in a biological system is an integration of effects arising from surface functionali~ particle size, ionic dissolution, etc. This complexity suggests that generalization of a material＇s toxicity may be inappropriate. Moreover, from a medicinal point of view, toxicity can be used for treatment of malignant cells, such as cancer. In this stud~ highly biocompatible carbon nanodots （gCDs） were synthesized by reacting citric acid and urea in glycerol, which resulted in abundant hydroxyl functional groups on the particle surface. gCDs show excitation-dependent photoluminescence but with bright green to yellow emission. Importantly, a series of toxicity assessments showed that as-synthesized gCDs possessed exceptional biocompatibilities to various biological entities including 18 bacteria species, Petunia axillaris seedlings, and Artemia franciscana nauplii. Furthermore, the particles were shown to have low to no toxic effects on human embryonic kidney （HeK-293）, breast （MCF-7）, and oral squamous （CAL-27） carcinoma cell lines. Of particular interest, the gCDs displayed antiproliferative activities against ovarian choriocarcinoma cells （JAr/Jeg-3 cell lines）, which may be further explored for cancer drug discovery.

关键词： carbon nanodots nanotoxicity fluorescence choriocarcinoma cells thioredoxin reductase

effects of Temperature on Photosynthetic Rates in Korean Fir (Abies koreana) between Healthy and Dieback Population

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2008年第2期50卷 190-193页

作者： Su Young Woo Jong-Hwan Lim don Koo Lee Department of environmental Horticulture University of Seoul Seoul 130-743 Republic of Korea Korea Forest Research Institute Seoul 130-712Republic of Korea Department of Forest Sciences College of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921Republic of Korea

The present study was carried out on natural Korean fir forests （Abies koreana） growing in Mount Halla in Jeju Island, Korea （33° 13-36＇ N and 126° 12-57＇ e）. Mount Halla is the highest mountain （1 950 m a.s.h） in South Korea. On the Korean fir forests near the top of Mount Halla in Korea, we established permanent plots between dieback and healthy population. each permanent plot includes both dieback and relatively healthy Korean fir individuals. Three sites in this study showed similar altitude, topographic position, aspects, slope, diameter at breast height, average height and ages. Net photosynthetic rates （PN） on different temperature regimes were evaluated to explain the forest dieback phenomenon on Korean fir populations. Light response curves were determined on three different temperature regimes： 15 ℃, 20℃ and 25℃. The irradiance response curve showed higher values in lower air temperatures. Generally, irradiance response curves of healthy Korean fir populations were higher than the dieback population at all sites.

关键词： Abies koreana global warming forest decline photosynthetic rates temperature.

维普期刊数据库

Hg and As Minerals in Fluid Inclusions from the Williams Mine, Hemlo, and Their Genetic Implications

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2002年第1期21卷 1-18页

作者：卢焕章 JAYANTA.GUHA don.C.HARRIS Sciences de la Terre Universite du Quebec a Chicoutimi Chicoutimi Quebec Canada G7H 2B 1 Geological Survey of Canada 601 Booth Street Ottawa Ont. Canada K1A 0E8

The Hemlo mineralization is enigmatic compared to general Archean lode gold deposits based on the fact that it is characterized by an exotic mineralogy containing elements such as As, Hg, Sb, Ba, V and Mo. The genetic concepts range from syngenetic to epigenetic types of mineralization. This reconnaissance study was designed to examine the relationship of Hg-As minerals with respect to fluid inclusions in the Williams mine (formerly known as the Page Williams mine) covering the A and C ore zones.

关键词：流体包裹体含汞矿物含砷矿物矿化作用金矿床

维普期刊数据库

On Some Properties of Graph of Prefix Code

在线全文

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2024年第4期12卷 1571-1581页

作者： Nikolai I. Krainiukov Mikhail e. Abramyan Boris F. Melnikov Faculty of Computational Mathematics and Cybernetics Shenzhen MSU-BIT University Shenzhen China Department of Algebra and Discrete Mathematics Southern Federal University Rostov-on-Don Russian Federation

We investigate decomposition of codes and finite languages. A prime decomposition is a decomposition of a code or languages into a concatenation of nontrivial prime codes or languages. A code is prime if it cannot be decomposed into at least two nontrivial codes as the same for the languages. In the paper, a linear time algorithm is designed, which finds the prime decomposition. If codes or finite languages are presented as given by its minimal deterministic automaton, then from the point of view of abstract algebra and graph theory, this automaton has special properties. The study was conducted using system for computational Discrete Algebra GAP. .

关键词： Finite Languages Minimal Deterministic Automata Concatenation Codes Graph of Automaton Free Algebra

On the “Onion Husk” Algorithm for Approximate Solution of the Traveling Salesman Problem

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2024年第4期12卷 1557-1570页

作者： Mikhail e. Abramyan Nikolai I. Krainiukov Boris F. Melnikov Faculty of Computational Mathematics and Cybernetics Shenzhen MSU-BIT University Shenzhen China Department of Algebra and Discrete Mathematics Southern Federal University Rostov-on-Don Russian Federation

The paper describes some implementation aspects of an algorithm for approximate solution of the traveling salesman problem based on the construction of convex closed contours on the initial set of points (“cities”) and their subsequent combination into a closed path (the so-called contour algorithm or “onion husk” algorithm). A number of heuristics related to the different stages of the algorithm are considered, and various variants of the algorithm based on these heuristics are analyzed. Sets of randomly generated points of different sizes (from 4 to 90 and from 500 to 10,000) were used to test the algorithms. The numerical results obtained are compared with the results of two well-known combinatorial optimization algorithms, namely the algorithm based on the branch and bound method and the simulated annealing algorithm. .

关键词： Branch and Bound Method Contour Algorithm “Onion Husk” Algorithm Simulated Annealing Method Traveling Salesman Problem

Two-Dimensional Multi-Domain Hybrid Spectral-WeNO Methods for Conservation Laws

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2006年第3期1卷 548-574页

作者： Bruno Costa Wai Sun don David Gottlieb Radislav Sendersky Departamento de Matem´atica Aplicada IM-UFRJCaixa Postal 68530Rio de JaneiroRJC.E.P.21945-970Brazil Division of Applied Mathematics Brown UniversityProvidenceRhode Island 02912USA

The multi-domain hybrid Spectral-WeNO method(Hybrid)is introduced for the numerical solution of two-dimensional nonlinear hyperbolic systems in a Cartesian physical domain which is partitioned into a grid of rectangular *** main idea of the Hybrid scheme is to conjugate the spectral and WeNO methods for solving problems with shock or high gradients such that the scheme adapts its solver spatially and temporally depending on the smoothness of the solution in a given *** as a multi-domain method,an adaptive algorithm is used to keep the solutions parts exhibiting high gradients and discontinuities always inside WeNO subdomains while the smooth parts of the solution are kept inside spectral ones,avoiding oscillations related to the well-known Gibbs phenomenon and increasing the numerical efficiency of the overall scheme.A higher order version of the multi-resolution analysis proposed by Harten is used to determine the smoothness of the solution in each *** also discuss interface conditions for the two-dimensional problem and the switching procedure between WeNO and spectral *** Hybrid method is applied to the two-dimensional Shock-Vortex Interaction and the Richtmyer-Meshkov Instability(RMI)problems.

关键词： Spectral WeNO multi-resolution multi-domain hybrid conservation laws