检索结果-南通市图书馆

Coating powder beds with liquids and foams based on viscous formulations using a twin screw mixer:A continuous process study

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第10期93卷 364-376页

作者： Mohamed S.Manga Dimitrios Kontziampasis Mustafa Al-Maqdad Sean Clifford Serafim Bakalis David W.york School of Chemical and Process Engineering Faculty of Engineering and Physical SciencesUniversity of LeedsLeedsLS29JTUK School of Mechanical Engineering Faculty of Engineering and Physical SciencesUniversity of LeedsLeedsLS29JTUK School of Science and Engineering University of DundeeDD14HNDundeeScotlandUK Dundee International Institute of Central South university Tongzipo RoadCentral South UniversityChangshaHunan410013China Department of Chemical Engineering School of EngineeringUniversity of NewcastleNewcastleNE17RUUK School of Chemical Engineering University of BirminghamBirminghamB152TTUK Department of Chemical Engineering Faculty of EngineeringUniversity of NottinghamNG72RDUK

Coating with viscous formulations has been essential in numerous industries as it can be a means for providing functionalization, additional properties, as well as other benefits. However, there have been scarce studies that have investigated and proposed methodologies in literature. Continuous coating of powders with viscous liquids poses as a promising technology, which has been mentioned in some studies, but has not yet been thoroughly investigated. This paper employs the use of image processing and analysis, in combination with statistical analysis of particles to evaluate the effectiveness of foams and liquids as a means of coating powder beds. Two different sizes of twin screw mixers that are working in continuous operation are employed, and a new continuous foaming device is fabricated and used for the experiments of coating. The effect of materials and process parameters (as for example rotational speed, and flowrate) on the quality of coating are investigated. Image analysis is used to assess the coating quality. The results clearly showcase the potential of using twin screw mixers for coating purposes and not only for mixing. The hypothesis that using large bubble foams to improve the coating of viscous liquids on particles is proven correct, as they provide higher quality coatings compared to their equivalent liquids, when used in the twin screw mixer. Surprisingly, using a larger scale twin screw mixer, does not show a substantial effect on the mixing, regarding quality, however there is still a requirement for mix optimization for achieving scale-up of this process. These results provide a new pathway for coating powders with viscous formulations in industrial applications, requiring less energy and effort in this process, and can pave the way towards introducing more sustainable industrial methodologies for coating.

关键词： Powder coating Continuous processing Viscous liquid Foam Image analysis Positron emission particle traking(PEPT)

Aggregation and assembly of crescent foldamers

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

Science China Chemistry 2010年第1期53卷 45-51页

作者： GONG Bing Department of Chemistry,university at Buffalo,The State university of new york.Buffalo,new york.14260,USA 1. Department of Chemistry University at Buffalo The State University of New York Buffalo New York 14260 USA

Recent studies have started to provide initial insights into the aggregation and assembly of two classes of back-rigidified foldamers with flat,curved backbones consisting of aromatic *** their persistent shape that presents large,well-defined aromatic surface areas,these crescent foldamers were found to undergo size-dependent aggregation in solution and pack into 1D assemblies in the solid *** aromatic oligoamides undergo stacking interactions not only in polar solvents but also in nonpolar ones,a unique property that is not associated with many other molecules that associate via π-π stacking *** stacking of oligo(m-phenylene ethynylenes) is similar to aromatic hydrocarbons,being promoted in polar solvents such as methanol while being discouraged in nonpolar solvents such as *** ready synthetic availability of crescent foldamers makes it possible to directly control the intermolecular interaction by tuning surface ***,the columnar assembly of these cavity-containing molecules provides a new strategy for constructing supramolecular nanotubular structures.

关键词： foldamer folding hydrogen bond π-π stacking aggregation assembly

Mapping Problems,Fundamental Groups and Defect Measures

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 1999年第1期15卷 25-52页

作者： Fanghua LinCourant Institute of Mathematics,new york.university,new york.NY 10012,USA Courant Institute of Mathematics New York University New York USA

We study all the possible weak limits of a minimizing sequence,for p-energy functionals, consisting of continuous maps between Riemannian manifolds subject to a Dirichlet boundary condition or a homotopy *** show that if p is not an integer,then any such weak limit is a strong limit and,in particular,a stationary p-harmonic map which is C1,α continuous away from a closed subset of the Hausdorff dimension ≤n-[p]-*** p is an integer,then any such weak limit is a weakly p-harmonic map along with a（n-p）-rectifiable Radon measure μ.Moreover,the limiting map is C1,α continuous away from a closed subset ∑=spt μ∪S with Hn-p（S）=***,we discuss the possible varifolds type theory for Sobolev mappings.

关键词： Defect measure Harmonic mapping Generalized varifold Rectifiability

On conformal measures for infinitely renormalizable quadratic polynomials

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2005年第10期48卷 1411-1420页

作者： HUANG Zhiyong~1 JIANG Yunping~(2,3) & WANG Yuefei~3 1. School of Information,Renmin university of China,Beijing 100872,China 2. Department of Mathematics,Queens College,city university of new york.NY 11367,USA Department of Mathematics,Graduate School,city university of new york.new york.NY 10016,USA 3. Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100080,China 1. School of Information Renmin University of China 100872 Beijing China 2. Department of Mathematics Queens College City University of New York 11367 NY USA 3. Department of Mathematics Graduate School City University of New York 10016 New York NY USA 4. Academy of Mathematics and Systems Science Chinese Academy of Sciences 100080 Beijing China

We study a conformal measure for an infinitely renormalizable quadratic polynomial. We prove that the conformal measure is ergodic if the polynomial is unbranched and has complex bounds. The main technique we use in t... 详细信息

关键词： Julia set, conformal measure, three-dimensional puzzle, infinitely renormalizable quadratic polynomial.

The Faddeev knots as stable solitons: Existence theorems

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2004年第2期47卷 187-197页

作者： LIN Fanghua & YANG YisongCourant Institute of Mathematical Sciences, new york.university, new york. new york.10012, U. S. A.School of Mathematics, Institute for Advanced Study, Princeton, new Jersey 08540, U. S. A. Department of Mathematics, Polytechnic university, Brooklyn, new york.11201, U. S. A. 1.Courant Institute of Mathematical Sciences New York University 10012 New York New York U S A 2.School of Mathematics Institute for Advanced Study 08540 Princeton New Jersey U S A 3.Department of Mathematics Polytechnic University 11201 Brooklyn New York U S A

The problem of existence of knot-like solitons as the energy-minimizing configurations in the Faddeev model, topologically characterized by an Hopf invariant, Q, is considered. It is proved that, in the full space situation, there exists an infinite set S of integers so that for any m ∈ S, the Faddeev energy, E, has a minimizer among the class Q = m; in the bounded domain situation, the same existence theorem holds when S is the set of all integers. One of the important technical results is that E and Q satisfy the sublinear inequality E ≤ C|Q|3/4, where C > 0 is a universal constant, which explains why knotted (clustered soliton) configurations are preferred over widely separated unknotted (multisoliton) configurations when |Q| is sufficiently large.

关键词： knots, Hopf invariant, minimization, solitons.

Arithmetic of Shimura curves

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第3期53卷 573-592页

作者： ZHANG Shou-Wu Department of Mathematics, Columbia university, new york. NY 10027, USA 1. Department of Mathematics Columbia University New York NY 10027 USA

This is the note for a series of lectures that the author gave at the Centre de Recerca Matemtica (CRM), Bellaterra, Barcelona, Spain on October 19–24, 2009. The aim is to give a comprehensive description of some recent work of the author and his students on generalisations of the Gross-Zagier formula, Euler systems on Shimura curves, and rational points on elliptic curves.

关键词： Shimura curves CM-points L-series

Static Theory for Planar Ferromagnets and Antiferromagnets

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2001年第4期17卷 541-580页

作者： Feng Bo HANG Fang Hua LIN Courant Institute, 251 Mercer Street. new york. NY 10012, USA Dept. of Math, Princeton university, Fine Hall. Washington Road, Princeton, NJ 08544 USA. Courant Institute New York USA

Here we generalize the "BBH"-asymptotic analysis to a simplified mathematical model for tho planar ferromaguets and antiferromagnets. To develop such a static theory is a necessary step for a rigorous mathematical jus... 详细信息

关键词： Ginzburg-Landau-type equations Vortices Minimizing harmonic maps Gradient cstimate Radial solutions Stability Quantization