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City University of New York (CUNY)

2012

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Articles 31 - 60 of 86

Full-Text Articles in Physical Sciences and Mathematics

Tr-2012008: Randomized Matrix Computations Iii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng Jan 2012

Tr-2012008: Randomized Matrix Computations Iii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng

Computer Science Technical Reports

No abstract provided.


Tr-2012014: More On The Power Of Randomized Matrix Multiplication, Victor Y. Pan, Guoliang Qian Jan 2012

Tr-2012014: More On The Power Of Randomized Matrix Multiplication, Victor Y. Pan, Guoliang Qian

Computer Science Technical Reports

No abstract provided.


Tr-2012015: Randomized Matrix Methods For Real And Complex Polynomial Root-Finding, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng Jan 2012

Tr-2012015: Randomized Matrix Methods For Real And Complex Polynomial Root-Finding, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng

Computer Science Technical Reports

No abstract provided.


Re-Engineering Ccny's Business Process Of The Non-Tax Levy Disbursements Requisitions, Ferguson Rodley Jan 2012

Re-Engineering Ccny's Business Process Of The Non-Tax Levy Disbursements Requisitions, Ferguson Rodley

Dissertations and Theses

No abstract provided.


Azide-Benzyne Cycloaddition And Olefination To Vinyl Benzotriazoles, Singh Govindra Jan 2012

Azide-Benzyne Cycloaddition And Olefination To Vinyl Benzotriazoles, Singh Govindra

Dissertations and Theses

No abstract provided.


Estimating Climate Trends: Application To United States Plant Hardiness Zones, Nir Krakauer Jan 2012

Estimating Climate Trends: Application To United States Plant Hardiness Zones, Nir Krakauer

Publications and Research

The United States Department of Agriculture classifies plant hardiness zones based on mean annual minimum temperatures over some past period (currently 1976–2005). Since temperatures are changing, these values may benefit from updating. I outline a multistep methodology involving imputation of missing station values, geostatistical interpolation, and time series smoothing to update a climate variable’s expected value compared to a climatology period and apply it to estimating annual minimum temperature change over the coterminous United States. I show using hindcast experiments that trend estimation gives more accurate predictions of minimum temperatures 1-2 years in advance compared to the previous 30 years’ …


Diffuse Optical Imaging Using Decomposition Methods, Binlin Wu, M. Alrubaiee, W. Cai, M. Xu, S. K. Gayen Jan 2012

Diffuse Optical Imaging Using Decomposition Methods, Binlin Wu, M. Alrubaiee, W. Cai, M. Xu, S. K. Gayen

Publications and Research

Diffuse optical imaging (DOI) for detecting and locating targets in a highly scattering turbid medium is treated as a blind source separation (BSS) problem. Three matrix decomposition methods, independent component analysis (ICA), principal component analysis (PCA), and nonnegative matrix factorization (NMF) were used to study the DOI problem. The efficacy of resulting approaches was evaluated and compared using simulated and experimental data. Samples used in the experiments included Intralipid-10% or Intralipid-20% suspension in water as the medium with absorptive or scattering targets embedded.


Tr-2012001: Algebraic Algorithms, Ioannis Z. Emiris, Victor Y. Pan, Elias P. Tsigaridas Jan 2012

Tr-2012001: Algebraic Algorithms, Ioannis Z. Emiris, Victor Y. Pan, Elias P. Tsigaridas

Computer Science Technical Reports

No abstract provided.


Tr-2012003: Root-Finding And Root-Refining For A Polynomial Equation, Victor Y. Pan Jan 2012

Tr-2012003: Root-Finding And Root-Refining For A Polynomial Equation, Victor Y. Pan

Computer Science Technical Reports

No abstract provided.


Tr-2012004: Solving Linear Systems Of Equations With Randomization, Augmentation And Aggregation, Victor Y. Pan, Guoliang Qian Jan 2012

Tr-2012004: Solving Linear Systems Of Equations With Randomization, Augmentation And Aggregation, Victor Y. Pan, Guoliang Qian

Computer Science Technical Reports

No abstract provided.


Tr-2012006: Randomized Matrix Computations Ii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng Jan 2012

Tr-2012006: Randomized Matrix Computations Ii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng

Computer Science Technical Reports

No abstract provided.


Tr-2012007: Solving Linear Systems Of Equations With Randomization, Augmentation And Aggregation Ii, Victor Y. Pan, Guoliang Qian Jan 2012

Tr-2012007: Solving Linear Systems Of Equations With Randomization, Augmentation And Aggregation Ii, Victor Y. Pan, Guoliang Qian

Computer Science Technical Reports

No abstract provided.


Tr-2012009: Randomized Matrix Computations Iv, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng Jan 2012

Tr-2012009: Randomized Matrix Computations Iv, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng

Computer Science Technical Reports

No abstract provided.


Tr-2012010: Explicit Generic Common Knowledge, Evangelia Antonakos Jan 2012

Tr-2012010: Explicit Generic Common Knowledge, Evangelia Antonakos

Computer Science Technical Reports

No abstract provided.


Tr-2012011: Binding Modalities, Sergei N. Artemov, Tatiana Yavorskaya (Sidon) Jan 2012

Tr-2012011: Binding Modalities, Sergei N. Artemov, Tatiana Yavorskaya (Sidon)

Computer Science Technical Reports

No abstract provided.


Tr-2012012: Condition Estimation By Means Of Power Method, Victor Y. Pan Jan 2012

Tr-2012012: Condition Estimation By Means Of Power Method, Victor Y. Pan

Computer Science Technical Reports

No abstract provided.


Tr-2012013: Condition Numbers Of Random Toeplitz And Circulant Matrices, Victor Y. Pan, Guoliang Qian Jan 2012

Tr-2012013: Condition Numbers Of Random Toeplitz And Circulant Matrices, Victor Y. Pan, Guoliang Qian

Computer Science Technical Reports

No abstract provided.


Tr-2012016: More On The Power Of Randomized Matrix Multiplication I, Victor Y. Pan, Guoliang Qian Jan 2012

Tr-2012016: More On The Power Of Randomized Matrix Multiplication I, Victor Y. Pan, Guoliang Qian

Computer Science Technical Reports

No abstract provided.


The Effect Of Dissolved Humic Acids On Aluminosilicate Formation And Associated Carbon Sequestration, Ashaki A. Rouff, Brian L. Phillips, Stacey G. Cochiara, Kathryn L. Nagy Jan 2012

The Effect Of Dissolved Humic Acids On Aluminosilicate Formation And Associated Carbon Sequestration, Ashaki A. Rouff, Brian L. Phillips, Stacey G. Cochiara, Kathryn L. Nagy

Publications and Research

Allophane and imogolite neogenesis in soils may occur in the presence of organic matter. To understand this process under conditions relevant to soils, the influence of dissolved organic carbon (DOC) as humic acid (HA), on aluminosilicate formation was studied at 25◦C, pH 6, and low-DOC concentrations. For solutions with initial Al/Si ratios of 1–2.1, and 0–6mg/L DOC, precipitates recovered after 20h had Al/Si ratios of 2.2–2.7. The formation of allophane, imogolite-like material, and aluminosilicate gel was confirmed by XRD, FTIR, and NMR. The effect of DOC was to produce a small, but systematic increase in imogolite-like Si in the precipitate, …


Mba: A Market-Based Approach To Data Allocation And Migration For Cloud Database, Tengjiao Wang, Ziyu Lin, Bishan Yang, Allen Huang, Dongqing Yang, Qi Zhang, Shiwei Tang, Jinzhong Niu Jan 2012

Mba: A Market-Based Approach To Data Allocation And Migration For Cloud Database, Tengjiao Wang, Ziyu Lin, Bishan Yang, Allen Huang, Dongqing Yang, Qi Zhang, Shiwei Tang, Jinzhong Niu

Publications and Research

With the coming shift to cloud computing, cloud database is emerging to provide database service over the Internet. In the cloud-based environment, data are distributed at internet scale and the system needs to handle a huge number of user queries simultaneously without delay. How data are distributed among the servers has a crucial impact on the query load distribution and the system response time. In this paper, we propose a market-based control method, called MBA, to achieve query load balance via reasonable data distribution. In MBA, database nodes are treated as traders in a market, and certain market rules are …


Fluids, Anomalies And The Chiral Magnetic Effect: A Group-Theoretic Formulation, V. Parameswaran Nair, Rashmi Ray, Shubho Roy Jan 2012

Fluids, Anomalies And The Chiral Magnetic Effect: A Group-Theoretic Formulation, V. Parameswaran Nair, Rashmi Ray, Shubho Roy

Publications and Research

It is possible to formulate fluid dynamics in terms of group-valued variables. This is particularly suited to the cases where the fluid has nonabelian charges and is coupled to nonabelian gauge fields. We explore this formulation further in this paper. An action for a fluid of relativistic particles (with and without spin) is given in terms of the Lorentz and Poincare (or de Sitter) groups. Considering the case of particles with flavor symmetries, a general fluid action which also incorporates all flavor anomalies is given. The chiral magnetic and chiral vorticity effects as well as the consequences of the mixed …


Equivariant Degenerations Of Spherical Modules For Groups Of Type A, Stavros Argyrios Papadakis, Bart Van Steirteghem Jan 2012

Equivariant Degenerations Of Spherical Modules For Groups Of Type A, Stavros Argyrios Papadakis, Bart Van Steirteghem

Publications and Research

Let G be a complex reductive algebraic group. Fix a Borel subgroup B of G and a maximal torus T in B. Call the monoid of dominant weights L+ and let S be a finitely generated submonoid of L+. V. Alexeev and M. Brion introduced a moduli scheme MS which classifies affine G-varieties X equipped with a T-equivariant isomorphism SpecC[X]U → SpecC[S], where U is the unipotent radical of B. Examples of MS have been obtained by S. Jansou, P. Bravi and S. Cupit-Foutou. In this paper, we prove that MS is isomorphic to an affine space when S is …


De Meo Carries On Tradition Of Teaching Chemistry, Aldemaro Romero Jr. Jan 2012

De Meo Carries On Tradition Of Teaching Chemistry, Aldemaro Romero Jr.

Publications and Research

No abstract provided.


Ackad Uses Power Computers To Solve Problems, Aldemaro Romero Jr. Jan 2012

Ackad Uses Power Computers To Solve Problems, Aldemaro Romero Jr.

Publications and Research

No abstract provided.


Yousef Studies The Physics Of Life And Health, Aldemaro Romero Jr. Jan 2012

Yousef Studies The Physics Of Life And Health, Aldemaro Romero Jr.

Publications and Research

No abstract provided.


Hamad Studies, Teaches Properties Of Light, Aldemaro Romero Jr. Jan 2012

Hamad Studies, Teaches Properties Of Light, Aldemaro Romero Jr.

Publications and Research

No abstract provided.


Rapid Decoding Of Digital Data Streams Using Field Programmable Gate Arrays, Andrew Hernandez Jan 2012

Rapid Decoding Of Digital Data Streams Using Field Programmable Gate Arrays, Andrew Hernandez

Dissertations and Theses

No abstract provided.


Developing A Comprehensive Software Toolkit For Creating Digital Mosaic Artwork, Dmitry Bosikov Jan 2012

Developing A Comprehensive Software Toolkit For Creating Digital Mosaic Artwork, Dmitry Bosikov

Dissertations and Theses

No abstract provided.


Studies On Sucralose-Based Low Molecular Weight Gelators, Malick Samateh Jan 2012

Studies On Sucralose-Based Low Molecular Weight Gelators, Malick Samateh

Dissertations and Theses

Amphiphiles are molecules with both hydrophilic head and hydrophobic tail groups. Examples of amphiphiles include surfactants, detergents, soaps, bile acids/salts and lipids. Due to their amphiphilic nature, they tend to self-assemble in solution via non-covalent interactions such as hydrogen-bonding, π-π stacking and donor–acceptor interactions to form hierarchical morphologies like micelles, lamellae and fibers. The ones capable of subsequently forming gels are known as low molecular weight gelators (LMWGs). LMWGs usually form “polymer-like” fibers that interact to form a three-dimentional network known as a Self-Assembled Fibrillar Network (SAFIN), which entraps and immobilizes the entire solvent pool to form a viscoeslatic material …


Casimir Effect: Edges And Diffraction, Dimitra Karabali Jan 2012

Casimir Effect: Edges And Diffraction, Dimitra Karabali

Publications and Research

The Casimir effect refers to the existence of a macroscopic force between conducting plates in vacuum due to quantum fluctuations of fields. These forces play an important role, among other things, in the design of nano-scale mechanical devices. Accurate experimental observations of this phenomenon have motivated the development of new theoretical approaches in dealing with the effects of different geometries, temperature etc. In this talk, I will focus on a new method we have developed in calculating the contribution to the Casimir effect due to diffraction from edges and holes in different geometries, at zero and at finite temperature.