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Articles 3211 - 3240 of 3756
Full-Text Articles in Physical Sciences and Mathematics
Estimation Of Phosphorus Bioavailability In The Water Column Of The Bronx River, New York, Jingyu Wang, Hari K. Pant
Estimation Of Phosphorus Bioavailability In The Water Column Of The Bronx River, New York, Jingyu Wang, Hari K. Pant
Publications and Research
Phosphorus (P) is a primary limiting nutrient in rivers and streams, and excessive P results in eutrophication of freshwater systems, in turn, excessive algal growth/toxic algal blooms, oxygen depletion, and water quality degradation. This study analyzed P pool, and hydrolysis of organic P (OP) by native phosphatases (NPase) in the water samples collected in the Bronx River. The soluble reactive P (SRP) of most of the sites’ water collected in 2006 and 2007 were higher (average 67 µg·L–1 and 68 µg·L–1, respectively) than the US Environmental Protection Agency’s (EPA) standard of 15 µg·L–1. The SRP% (SRP/TP%) average was 27% in …
1112+3548_Nir_Spex, J. Patience
Rational Design And Characterization Of D-Phe-Pro-D-Arg-Derived Direct Thrombin Inhibitors, Ana C. Figueiredo, Christina C. Clement, Sheuli Zakia, Julian Gingold, Manfred Philipp, Pedro J.B. Pereira
Rational Design And Characterization Of D-Phe-Pro-D-Arg-Derived Direct Thrombin Inhibitors, Ana C. Figueiredo, Christina C. Clement, Sheuli Zakia, Julian Gingold, Manfred Philipp, Pedro J.B. Pereira
Publications and Research
The tremendous social and economic impact of thrombotic disorders, together with the considerable risks associated to the currently available therapies, prompt for the development of more efficient and safer anticoagulants. Novel peptide-based thrombin inhibitors were identified using in silico structure-based design and further validated in vitro. The best candidate compounds contained both l- and d-amino acids, with the general sequence d-Phe(P3)-Pro(P2)-d-Arg(P1)-P1'-CONH2. The P1' position was scanned with l- and d-isomers of natural or unnatural amino acids, covering the major chemical classes. The most potent non-covalent and proteolysis-resistant inhibitors contain small hydrophobic or polar amino acids (Gly, Ala, Ser, Cys, Thr) …
Advances In Ultrafast Time Resolved Fluorescence Physics For Cancer Detection In Optical Biopsy, R. R. Alfano
Advances In Ultrafast Time Resolved Fluorescence Physics For Cancer Detection In Optical Biopsy, R. R. Alfano
Publications and Research
We discuss the use of time resolved fluorescence spectroscopy to extract fundamental kinetic information on molecular species in tissues. The temporal profiles reveal the lifetime and amplitudes associated with key active molecules distinguishing the local spectral environment of tissues. The femtosecond laser pulses at 310 nm excite the tissue. The emission profile at 340 nm from tryptophan is non-exponential due to the micro-environment. The slow and fast amplitudes and lifetimes of emission profiles reveal that cancer and normal states can be distinguished. Time resolved optical methods offer a new cancer diagnostic modality for the medical community.
Demonstration Of The Gunnarsson-Lundqvist Theorem And The Multiplicity Of Potentials For Excited States, Yu-Qi Li, Xiao-Yin Pan, Biao Li, Viraht Sahni
Demonstration Of The Gunnarsson-Lundqvist Theorem And The Multiplicity Of Potentials For Excited States, Yu-Qi Li, Xiao-Yin Pan, Biao Li, Viraht Sahni
Publications and Research
The Gunnarsson-Lundqvist (GL) theorem of density functional theory states that there is a one-to-one relationship between the density of the lowest nondegenerate excited state of a given symmetry and the external potential. As a consequence, knowledge of this excited state density determines the external potential uniquely. [The GL theorem is the equivalent for such excited states of theHohenberg-Kohn (HK) theorem for nondegenerate ground states.] For other excited states, there is no equivalent of the GL or HK theorem. For these states, there thus exist multiple potentials that generate the excited-state density. We show, by example, the satisfaction that the GL …
Entropy And The Complexity Of Graphs Revisited, Abbe Mowshowitz, Matthias Dehmer
Entropy And The Complexity Of Graphs Revisited, Abbe Mowshowitz, Matthias Dehmer
Publications and Research
This paper presents a taxonomy and overview of approaches to the measurement of graph and network complexity. The taxonomy distinguishes between deterministic (e.g., Kolmogorov complexity) and probabilistic approaches with a view to placing entropy-based probabilistic measurement in context. Entropy-based measurement is the main focus of the paper. Relationships between the different entropy functions used to measure complexity are examined; and intrinsic (e.g., classical measures) and extrinsic (e.g., Körner entropy) variants of entropy-based models are discussed in some detail.
Coupling Of Fog And Marine Microbial Content In The Near-Shore Coastal Environment, M. E. Ducker, Gregory D. O'Mullan, K. C. Weathers, A. R. Juhl, M. Uriarte
Coupling Of Fog And Marine Microbial Content In The Near-Shore Coastal Environment, M. E. Ducker, Gregory D. O'Mullan, K. C. Weathers, A. R. Juhl, M. Uriarte
Publications and Research
Microbes in the atmosphere (microbial aerosols) play an important role in climate and provide an ecological and biogeochemical connection between oceanic, atmospheric, and terrestrial environments. However, the sources and environmental factors controlling the concentration, diversity, transport, and viability of microbial aerosols are poorly understood. This study examined culturable microbial aerosols from a coastal environment in Maine (USA) and determined the effect of onshore wind speed and fog presence on deposition rate, source, and community composition. During fog events with low onshore winds (
Aligned Layers Of Silver Nano-Fibers, Andrii B. Golovin, Jeremy Stromer, Liubov Kreminska
Aligned Layers Of Silver Nano-Fibers, Andrii B. Golovin, Jeremy Stromer, Liubov Kreminska
Publications and Research
We describe a new dichroic polarizers made by ordering silver nano-fibers to aligned layers. The aligned layers consist of nano-fibers and self-assembled molecular aggregates of lyotropic liquid crystals. Unidirectional alignment of the layers is achieved by means of mechanical shearing. Aligned layers of silver nano-fibers are partially transparent to a linearly polarized electromagnetic radiation. The unidirectional alignment and density of the silver nano-fibers determine degree of polarization of transmitted light. The aligned layers of silver nano-fibers might be used in optics, microwave applications, and organic electronics.
Horizontally-Aligned Carbon Nanotubes Arrays And Their Interactions With Liquid Crystal Molecules: Physical Characteristics And Display Applications, Frederick Roussel, Jean-Francois Brun, Alexandre Allart, Limin Huang, Stephen O'Brien
Horizontally-Aligned Carbon Nanotubes Arrays And Their Interactions With Liquid Crystal Molecules: Physical Characteristics And Display Applications, Frederick Roussel, Jean-Francois Brun, Alexandre Allart, Limin Huang, Stephen O'Brien
Publications and Research
We report on the physical characteristics of horizonthally-grown Single-Walled Carbon Nanotubes (h-al-SWNT) arrays and their potential use as transparent and conducting alignment layer for liquid crystals display devices. Microscopy (SEM and AFM), spectroscopic (Raman) and electrical investigations demonstrate the strong anisotropy of h-al-SWNT arrays. Optical measurements show that h-al-SWNTs are efficient alignment layers for Liquid Crystal (LC) molecules allowing the fabrication of optical wave plates. Interactions between h-al-SWNT arrays and LC molecules are also investigated evidencing the weak azimuthal anchoring energy at the interface, which, in turn, leads to LC devices with a high pretilt angle. The electro-optical reponses of …
Tr-2012004: Solving Linear Systems Of Equations With Randomization, Augmentation And Aggregation, Victor Y. Pan, Guoliang Qian
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-2012011: Binding Modalities, Sergei N. Artemov, Tatiana Yavorskaya (Sidon)
Tr-2012011: Binding Modalities, Sergei N. Artemov, Tatiana Yavorskaya (Sidon)
Computer Science Technical Reports
No abstract provided.
Tr-2012005: Randomized Matrix Computations, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Tr-2012005: Randomized Matrix Computations, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
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
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.
Tr-2012010: Explicit Generic Common Knowledge, Evangelia Antonakos
Tr-2012010: Explicit Generic Common Knowledge, Evangelia Antonakos
Computer Science Technical Reports
No abstract provided.
Tr-2012001: Algebraic Algorithms, Ioannis Z. Emiris, Victor Y. Pan, Elias P. Tsigaridas
Tr-2012001: Algebraic Algorithms, Ioannis Z. Emiris, Victor Y. Pan, Elias P. Tsigaridas
Computer Science Technical Reports
No abstract provided.
Tr-2012002: Randomized Matrix Methods For Real And Complex Polynomial Root-Finding, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Tr-2012002: 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.
Tr-2012003: Root-Finding And Root-Refining For A Polynomial Equation, Victor Y. Pan
Tr-2012003: Root-Finding And Root-Refining For A Polynomial Equation, Victor Y. Pan
Computer Science Technical Reports
No abstract provided.
Tr-2012006: Randomized Matrix Computations Ii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Tr-2012006: Randomized Matrix Computations Ii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Computer Science Technical Reports
No abstract provided.
Tr-2012008: Randomized Matrix Computations Iii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Tr-2012008: Randomized Matrix Computations Iii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Computer Science Technical Reports
No abstract provided.
Tr-2012009: Randomized Matrix Computations Iv, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Tr-2012009: Randomized Matrix Computations Iv, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Computer Science Technical Reports
No abstract provided.
Tr-2012012: Condition Estimation By Means Of Power Method, Victor Y. Pan
Tr-2012012: Condition Estimation By Means Of Power Method, Victor Y. Pan
Computer Science Technical Reports
No abstract provided.
Tr-2012016: More On The Power Of Randomized Matrix Multiplication I, Victor Y. Pan, Guoliang Qian
Tr-2012016: More On The Power Of Randomized Matrix Multiplication I, Victor Y. Pan, Guoliang Qian
Computer Science Technical Reports
No abstract provided.
An Assessment Of Strategies For Choosing Between Competitive Marketplaces, Tim Miller, Jinzhong Niu
An Assessment Of Strategies For Choosing Between Competitive Marketplaces, Tim Miller, Jinzhong Niu
Publications and Research
Traders that operate in markets with multiple competing marketplaces must often choose with which marketplace they will trade. These choices encourage marketplaces to seek competitive advantages against each other by adjusting various parameters, such as the price they charge, or how they match buyers and sellers. Traders can take advantage of this competition to improve utility. However, appropriate strategies must be used to decide with which marketplace a trader should shout. In this paper, we assess several different solutions to the problem of marketplace selection by running simulations of double auctions using the JCAT platform. The parameter spaces of these …
Tr-2012007: Solving Linear Systems Of Equations With Randomization, Augmentation And Aggregation Ii, Victor Y. Pan, Guoliang Qian
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-2012013: Condition Numbers Of Random Toeplitz And Circulant Matrices, Victor Y. Pan, Guoliang Qian
Tr-2012013: Condition Numbers Of Random Toeplitz And Circulant Matrices, Victor Y. Pan, Guoliang Qian
Computer Science Technical Reports
No abstract provided.
Tr-2012014: More On The Power Of Randomized Matrix Multiplication, Victor Y. Pan, Guoliang Qian
Tr-2012014: More On The Power Of Randomized Matrix Multiplication, Victor Y. Pan, Guoliang Qian
Computer Science Technical Reports
No abstract provided.
De Meo Carries On Tradition Of Teaching Chemistry, Aldemaro Romero Jr.
De Meo Carries On Tradition Of Teaching Chemistry, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Yousef Studies The Physics Of Life And Health, Aldemaro Romero Jr.
Yousef Studies The Physics Of Life And Health, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Estimating Climate Trends: Application To United States Plant Hardiness Zones, Nir Krakauer
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’ …
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
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 …