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Institution

University of North Carolina at Charlotte

EducationCharlotte, North Carolina, United States
About: University of North Carolina at Charlotte is a education organization based out in Charlotte, North Carolina, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 8772 authors who have published 22239 publications receiving 562529 citations. The organization is also known as: UNC Charlotte & UNCC.


Papers
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Journal Article
TL;DR: In this article, it was shown that solutions of 3D Euler/Navier-Stokes equations can be decomposed as U(t, x 1, x 1, x 2, x 3 ) + r where r is a remainder of order Ro a 1/2 where Ro a = H 0 U 0 /Ω 0 L 0 2 is the anisotropic Rossby number.
Abstract: Periodic boundary conditions are imposed, the ratio of domain periods is assumed to be generic (non-resonant). We show that solutions of 3D Euler/Navier-Stokes equations can be decomposed as U (t, x 1 , x 2 , x 3 ) = U (t, x 1 , x 2 ) + V (t, x 1 , x 2 , x 3 ) + r where U is a solution of the 2D Euler/Navier-Stokes system with vertically averaged initial data (axis of rotation is taken along the vertical e 3 ). Here r is a remainder of order Ro a 1/2 where Ro a = H 0 U 0 /Ω 0 L 0 2 is the anisotropic Rossby number (H 0 - height, L 0 - horizontal length scale, Ω 0 - angular velocity of background rotation, U 0 - horizontal velocity scale); Ro a = (H 0 /L 0 ) R 0 where H 0 /L 0 is the aspect ratio and Ro = U 0 /Ω 0 L 0 is a Rossby number based on the horizontal length scale L 0 . The vector field V (t, x 1 , x 2 , x 3 ) which is exactlty solved in terms of 2D dynamics of vertically averaged fields is phase-locked to the phases 2Ω 0 t, τ 1 (t) and τ 2 (t). The last two are defined in terms of passively advected scalars by 2D turbulence. The phases τ 1 (t) and τ 2 (t) are associated with vertically averaged vertical vorticity curl U(t).e 3 and velocity U 3 (t); the last is weighted (in Fourier space) by a classical non-local wave operator.

143 citations

Journal ArticleDOI
TL;DR: For example, the great majority of large classes are taught by the lecture method and student performance is evaluated through the use of true/false and multiple choice exams as mentioned in this paper, which curtails both the instructional strategies that are employed and the content of the courses being taught.
Abstract: of credit hours that can be taught by graduate faculty. In attempting to cope with these problems, many institutions have been forced to substantially increase class sizes to capitalize on the economies of scale. Unfortunately, this move to larger classes has often led to changes in both the instructional strategies that are employed and the content of the courses that are being taught. For example, the great majority of large classes are taught by the lecture method and student performance is evaluated through the use of true/false and multiple choice exams. This curtails both the

143 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that for any irrational a, the spectrum has a singular continuous spectrum for all irrational a = 2,al = 0 (presumably all irrational I = 0).
Abstract: q2 a P--E~ I --+ 0 (1.2) qn I as n ~ c ~ . Then for a.e. 8, hA=2,a,o has purely singular continuous spectrum. Remarks. (1) (1.2) is used because for such a, Last [22] has proven that the spectrum, a~,~, of h~,~,e (which is 0-independent [5]) has la2,al=0 (where I" I denotes Lebesgue measure). Our proof is such that for any other a with la~=2,~ I=0 (presumably all irrational a), one has that hA=2,a,e has purely singular continuous spectrum for a.e.O.

143 citations

Journal ArticleDOI
TL;DR: A case study is presented that showcases how HierarchicalTopics aid expert users in making sense of a large number of topics and discovering interesting patterns of topic groups, and a user study is conducted to quantitatively evaluate the effect of hierarchical topic structure.
Abstract: Analyzing large textual collections has become increasingly challenging given the size of the data available and the rate that more data is being generated. Topic-based text summarization methods coupled with interactive visualizations have presented promising approaches to address the challenge of analyzing large text corpora. As the text corpora and vocabulary grow larger, more topics need to be generated in order to capture the meaningful latent themes and nuances in the corpora. However, it is difficult for most of current topic-based visualizations to represent large number of topics without being cluttered or illegible. To facilitate the representation and navigation of a large number of topics, we propose a visual analytics system - HierarchicalTopic (HT). HT integrates a computational algorithm, Topic Rose Tree, with an interactive visual interface. The Topic Rose Tree constructs a topic hierarchy based on a list of topics. The interactive visual interface is designed to present the topic content as well as temporal evolution of topics in a hierarchical fashion. User interactions are provided for users to make changes to the topic hierarchy based on their mental model of the topic space. To qualitatively evaluate HT, we present a case study that showcases how HierarchicalTopics aid expert users in making sense of a large number of topics and discovering interesting patterns of topic groups. We have also conducted a user study to quantitatively evaluate the effect of hierarchical topic structure. The study results reveal that the HT leads to faster identification of large number of relevant topics. We have also solicited user feedback during the experiments and incorporated some suggestions into the current version of HierarchicalTopics.

143 citations

Journal ArticleDOI
TL;DR: The importance of plasmonic nanoparticles in sensor development, imaging, photodiagnostics, and optoelectronics has resulted in a strong interest toward the development of straightforward synthetic methods for their preparation.
Abstract: The importance of plasmonic nanoparticles in sensor development, imaging, photodiagnostics, and optoelectronics has resulted in a strong interest toward the development of straightforward synthetic methods for their preparation. In this article, we review some of the most significant advances that have been made in the synthesis of plasmonic bimetallic nanoparticles. Approaches to control morphology, with an emphasis on reactions that produce uniform particles with well-defined sizes and shapes and in high yields, are described. In addition, several characterization techniques that have been employed to elucidate the morphology of the particles are illustrated.

143 citations


Authors

Showing all 8936 results

NameH-indexPapersCitations
Chao Zhang127311984711
E. Magnus Ohman12462268976
Staffan Kjelleberg11442544414
Kenneth L. Davis11362261120
David Wilson10275749388
Michael Bauer100105256841
David A. B. Miller9670238717
Ashutosh Chilkoti9541432241
Chi-Wang Shu9352956205
Gang Li9348668181
Tiefu Zhao9059336856
Juan Carlos García-Pagán9034825573
Denise C. Park8826733158
Santosh Kumar80119629391
Chen Chen7685324974
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202361
2022231
20211,470
20201,561
20191,489
20181,318