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Articles 3991 - 4020 of 5190
Full-Text Articles in Entire DC Network
Image Quality Analysis Of A Spectra-Radiometric Sparse-Aperture Model, Noah R. Block, Robert Introne, John R. Schott
Image Quality Analysis Of A Spectra-Radiometric Sparse-Aperture Model, Noah R. Block, Robert Introne, John R. Schott
Articles
Sparse aperture (SA) telescopes represent a promising technology to increase the effective diameter of an optical system while reducing overall weight and stowable size. Although conceptually explored in the literature for decades, the technology has only recently matured to the point of being reasonably considered for certain applications. In general, a sparse aperture system consists of an array of sub-apertures that are phased to synthesize a larger effective aperture. The models used to date to create predictions of sparse aperture imagery typically make use of a “gray world” assumption, where the input is a resampled black and white panchromatic image. …
Time Restrictions In Natural Resource Management: A Dynamic And Stochastic Analysis, Amitrajeet A. Batabyal, Hamid Beladi
Time Restrictions In Natural Resource Management: A Dynamic And Stochastic Analysis, Amitrajeet A. Batabyal, Hamid Beladi
Articles
This paper provides a theoretical analysis of time restrictions in the context of natural resource management in North America. The economic inefficiencies arising from the use of time restrictions to protect natural resources have been well documented by researchers. We first show that in the presence of uncertainty about the evolution of the resource stock, time restrictions can lead to the collapse of the resource that is sought to be protected. Given this finding, in the second part of the paper, we discuss an approach to natural resource management under uncertainty in which time restrictions are used to maximize the …
On The Dressing Method For The Generalised Zakharov-Shabat System, Rossen Ivanov
On The Dressing Method For The Generalised Zakharov-Shabat System, Rossen Ivanov
Articles
The dressing procedure for the Generalised Zakharov-Shabat system is well known for systems, related to sl(N) algebras. We extend the method, constructing explicitly the dressing factors for some systems, related to orthogonal and symplectic Lie algebras. We consider ’dressed’ fundamental analytical solutions with simple poles at the prescribed eigenvalue points and obtain the corresponding Lax potentials, representing the soliton solutions for some important nonlinear evolution equations.
Fuzzy Control With Random Delays Using Invariant Cones And Its Application To Control Of Energy Processes In Microelectromechanical Motion Devices, A. Sinha, Sergey Lyshevski
Fuzzy Control With Random Delays Using Invariant Cones And Its Application To Control Of Energy Processes In Microelectromechanical Motion Devices, A. Sinha, Sergey Lyshevski
Articles
In this paper, a class of microelectromechanical systems described by nonlinear differential equations with random delays is examined. Robust fuzzy controllers are designed to control the energy conversion processes with the ultimate objective to guarantee optimal achievable performance. The fuzzy rule base used consists of a collection of r fuzzy IF-THEN rules defined as a function of the conditional variable. The method of the theory of cones and Lyapunov functionals is used to design a class of local fuzzy control laws. A verifiably sufficient condition for stochastic stability of fuzzy stochastic microelectromechanical systems is given. As an example, we have …
N-Body Growth Of A Bahcall-Wolf Cusp Around A Black Hole, Miguel Preto, David Merritt, Rainer Spurzem
N-Body Growth Of A Bahcall-Wolf Cusp Around A Black Hole, Miguel Preto, David Merritt, Rainer Spurzem
Articles
We present a clear N-body realization of the growth of a Bahcall-Wolf f µE^1/4 (µr^−7/4) density cusp around a massive object (“black hole”) at the center of a stellar system. Our N-body algorithm incorporates a novel implementation of Mikkola-Aarseth chain regularization to handle close interactions between star and black hole particles. Forces outside the chain were integrated on a GRAPE-6A/8 special-purpose computer with particle numbers up to N = 0.25×10^6. We compare our N-body results with predictions of the isotropic Fokker-Planck equation and verify that the time dependence of the density (both configuration and phase-space) predicted by the Fokker-Planck equation …
Identification And Detection Of Gaseous Effluents From Hyperspectral Imagery Using Invariant Algorithms, Erin M. O'Donnell, David W. Messinger, Carl Salvaggio, John Schott
Identification And Detection Of Gaseous Effluents From Hyperspectral Imagery Using Invariant Algorithms, Erin M. O'Donnell, David W. Messinger, Carl Salvaggio, John Schott
Articles
The ability to detect and identify effluent gases is, and will continue to be, of great importance. This would not only aid in the regulation of pollutants but also in treaty enforcement and monitoring the production of weapons. Considering these applications, finding a way to remotely investigate a gaseous emission is highly desirable. This research utilizes hyperspectral imagery in the infrared region of the electromagnetic spectrum to evaluate an invariant method of detecting and identifying gases within a scene. The image is evaluated on a pixel-by-pixel basis and is studied at the subpixel level. A library of target gas spectra …
Temporal Variations In The Apparent Emissivity Of Various Materials, Carl Salvaggio, David P. Miller
Temporal Variations In The Apparent Emissivity Of Various Materials, Carl Salvaggio, David P. Miller
Articles
Spectral emissivity measurements gathered in the longwave infrared region of the spectrum during a recent airborne hyperspectral data collection experiment indicated that the spectral emissivity of certain organic polymers changed by as much as 10% throughout the day. Inorganic and many other organic materials that were measured at the same time during this experiment showed no change. As this was an unexpected event, a subsequent experiment was designed to make emissivity measurements of several organic and inorganic materials over a 24-hour period/diurnal cycle. The results from this experiment confirmed that certain materials showed a significant spectral emissivity variation over this …
Comparison Of Basis-Vector Selection Methods For Target And Background Subspaces As Applied To Subpixel Target Detection, Peter Bajorski, Emmett J. Ientilucci, John Schott
Comparison Of Basis-Vector Selection Methods For Target And Background Subspaces As Applied To Subpixel Target Detection, Peter Bajorski, Emmett J. Ientilucci, John Schott
Articles
This paper focuses on comparing three basis-vector selection techniques as applied to target detection in hyperspectral imagery. The basis-vector selection methods tested were the singular value decomposition (SVD), pixel purity index (PPI), and a newly developed approach called the maximum distance (MaxD) method. Target spaces were created using an illumination invariant technique, while the background space was generated from AVIRIS hyperspectral imagery. All three selection techniques were applied (in various combinations) to target as well as background spaces so as to generate dimensionally-reduced subspaces. Both target and background subspaces were described by linear subspace models (i.e., structured models). Generated basis …
Fibonacci And Lucas Numbers As Tridiagonal Matrix Determinants, Nathan D. Cahill, Darren Narayan
Fibonacci And Lucas Numbers As Tridiagonal Matrix Determinants, Nathan D. Cahill, Darren Narayan
Articles
There are many known connections between determinants of tridiagonal matrices and the Fibonacci and Lucas numbers.
Cooking Online: Investigating The Effectiveness Of Providing Online Support Material To Students On A Professional Cookery Apprenticeship Course, Nuala Harding
Articles
Having worked as a lecturer for five years, I was given the opportunity to undertake the postgraduate diploma in third-level learning and teaching at the Technological University Dublin. The elective I chose as part of this course was online learning. The requirement to compile a reflective journal during the module has provided the catalyst for me to write this paper. This Paper describes work in progress for proposed research within the Department of Hospitality, Tourism and Leisure Studies in Athlone Institute of Technology (AIT). The purpose of this research is to investigate the feasibility of providing and the effectiveness of …
Approaching The Numerical Aperture Of Water - Immersion Lithography At 193nm, Bruce W. Smith, Anatoly Bourov, Yongfa Fan, Lena V. Zayvalova, Neal Vincent Lafferty, Frank Charles Cropanese
Approaching The Numerical Aperture Of Water - Immersion Lithography At 193nm, Bruce W. Smith, Anatoly Bourov, Yongfa Fan, Lena V. Zayvalova, Neal Vincent Lafferty, Frank Charles Cropanese
Articles
As immersion nanolithography gains acceptance for next generation device applications, experimental data becomes increasingly important. The behavior of resist materials, fluids, coatings, sources, and optical components in the presence of a water immersion media presents conditions unique compared to convention “dry” lithography. Several groups have initiated fundamental studies into the imaging, fluids, contamination, and integration issues involved with water immersion lithography at 193nm. This paper will present the status and results of the next stage of the development efforts carried out at RIT. The status of two systems are presented; a small field projection microstepper utilizing a 1.05 catadioptric immersion …
'Bound Fast And Brought Under The Yoke': John Adams And The Regulation Of Privacy At The Founding, Alison Lacroix
'Bound Fast And Brought Under The Yoke': John Adams And The Regulation Of Privacy At The Founding, Alison Lacroix
Articles
No abstract provided.
Computation Of The Ramsey Number R(B_3, K_5), Andrey Babak, Stanislaw Radziszowski, Kung-Kuen Tse
Computation Of The Ramsey Number R(B_3, K_5), Andrey Babak, Stanislaw Radziszowski, Kung-Kuen Tse
Articles
In 1989, George R. T. Hendry presented a table of two-color graph Ramsey numbers R(G,H) for all pairs of graphs G and H having five vertices, with the exception of seven cases. Until now, only two of the these open cases were solved. This work eliminates another one by computing R(B_3,K_5) = 20, where B_3 = K_2 + K_3 is the book graph of order 5. In addition, we show that for these parameters there exists a unique up to isomorphism critical graph. The results are based on computer algorithms. Among the four remaining open cases in Hendry's table, the …
From Agency To Zattiero - The Effect Of School Board Policy, John E. Rumel
From Agency To Zattiero - The Effect Of School Board Policy, John E. Rumel
Articles
No abstract provided.
Consequences Of Gravitational Radiation Recoil, David Merritt, Miloš Milosavljević, Marc Favata, Scott A. Hughes, Daniel E. Holz
Consequences Of Gravitational Radiation Recoil, David Merritt, Miloš Milosavljević, Marc Favata, Scott A. Hughes, Daniel E. Holz
Articles
Coalescing binary black holes experience an impulsive kick due to anisotropic emission of gravitational waves. We discuss the dynamical consequences of the recoil accompanying massive black hole mergers. Recoil velocities are sufficient to eject most coalescing black holes from dwarf galaxies and globular clusters, which may explain the apparent absence of massive black holes in these systems. Ejection from giant elliptical galaxies would be rare, but coalescing black holes are displaced from the center and fall back on a time scale of order the half-mass crossing time. Displacement of the black holes transfers energy to the stars in the nucleus …
Possible Limits On Photon Propagation From Quantum Gravity And Space-Time Foam, Manasse R. Mbonye, Fred Adams
Possible Limits On Photon Propagation From Quantum Gravity And Space-Time Foam, Manasse R. Mbonye, Fred Adams
Articles
Many quantum gravity theories imply that the vacuum is filled with virtual black holes. This paper explores the process in which high energy photons interact with virtual black holes and decay into gravitons and photons of lower energy. The effect requires violation (or modification) of Lorentz invariance and implies that high energy photons cannot propagate over arbitrarily large distances. For the standard Planck mass and the likely form for the interaction cross section, this quantum foam limit becomes $\dist < 450$ Mpc $(\egam/10^7 {\rm GeV})^{-5}$. (Refer to PDF file for exact formula.) For quantum gravity theories that posit a lower Planck scale, the interaction rate is larger and the limit is stronger. This paper uses extant observations of gamma rays from cosmological sources to constrain this process for varying values of the Planck mass and a range of forms for the interaction cross sections.
The Organisation For Economic Cooperation And Development, Richard Woodward
The Organisation For Economic Cooperation And Development, Richard Woodward
Articles
This article reviews the role of the OECD, a much cited but little studied institution, in global governance.
Rules, Principles, And The Accounting Crisis In The United States, William Wilson Bratton
Rules, Principles, And The Accounting Crisis In The United States, William Wilson Bratton
Articles
The Sarbanes-Oxley Act and the Securities Exchange Commission move too quickly when they prod the Financial Accounting Standards Board, the standard setter for US GAAP, to move immediately to a principles-based system. Priorities respecting reform of corporate reporting in the US need to be ordered more carefully. Incentive problems impairing audit performance should be solved first through institutional reform insulating the audit from the negative impact of rent-seeking and solving adverse selection problems otherwise affecting audit practice. So long as auditor independence and management incentives respecting accounting treatments remain suspect, the US reporting system holds out no actor plausibly positioned …
Nothing Can Replace Our Son, Ian Kilroy
Nothing Can Replace Our Son, Ian Kilroy
Articles
‘Nothing Can Replace Our Son’ is about US casualties in the war in Iraq that began in March 2003. It features parents who have lost children fighting for the US side.
Performance Analysis Of Improved Methodology For Incorporation Of Spatial/Spectral Variability In Synthetic Hyperspectral Imagery, Neil W. Scanlan, John Schott, Scott D. Brown
Performance Analysis Of Improved Methodology For Incorporation Of Spatial/Spectral Variability In Synthetic Hyperspectral Imagery, Neil W. Scanlan, John Schott, Scott D. Brown
Articles
Synthetic imagery has traditionally been used to support sensor design by enabling design engineers to pre-evaluate image products during the design and development stages. Increasingly exploitation analysts are looking to synthetic imagery as a way to develop and test exploitation algorithms before image data are available from new sensors. Even when sensors are available, synthetic imagery can significantly aid in algorithm development by providing a wide range of "ground truthed" images with varying illumination, atmospheric, viewing and scene conditions. One limitation of synthetic data is that the background variability is often too bland. It does not exhibit the spatial and …
Latent-Image Formation In Tabular Agbr Grains: Experimental Studies, Richard Hailstone, J. French, Rene Dekeyzer
Latent-Image Formation In Tabular Agbr Grains: Experimental Studies, Richard Hailstone, J. French, Rene Dekeyzer
Articles
Five tabular-grain AgBr emulsions of varying grain thickness were studied. Two were chemically sensitized in the presence of a blue spectral sensitizing dye, whereas the other three were chemically sensitized in the presence of a green spectral sensitizing dye. A companion set of emulsions chemically sensitized in the absence of dye was also prepared. Internal image development of the unsensitized emulsions showed substantial internal image in one emulsion, but minor amounts in the other emulsions. After chemical sensitization, there was no detectable internal image in any of the emulsions. Reciprocity failure data from 10^–4 to 10^3 s showed that the …
Sulfide Centers On (111) Agbr Surfaces: Effect Of Tetraazaindene On Electronic Properties, Richard Hailstone, A. Gary Difrancesco, Monica Tyne
Sulfide Centers On (111) Agbr Surfaces: Effect Of Tetraazaindene On Electronic Properties, Richard Hailstone, A. Gary Difrancesco, Monica Tyne
Articles
Sensitometric and spectroscopic techniques are used to study the effect of 4-hydroxy- 6-methyl-1,3,3a,7-tetraazaindene (TAI) during the sulphur sensitization of AgBr octahedra. TAI increased the speed of an oversensitized emulsion, causing it to have a speed comparable with the optimally sulfur-sensitized emulsion at high irradiance. TAI decreased the absorption by sulphide centres at 1.5 mmole concentration but not at 1 mmole. The long wavelength sensitivity (>500 nm) increased at 1 mmole TAI concentration, but decreased at 1.5 mmole TAI concentration, whereas the activation energy for this response was reduced at both TAI levels. These results are interpreted using a model …
Conversational Diagnostic Agent, Michael Yacci, Peter Lutz
Conversational Diagnostic Agent, Michael Yacci, Peter Lutz
Articles
No abstract provided.
Monolithically Integrated Si/Sige Resonant Interband Tunnel Diode/Cmos Demonstrating Low Voltage Mobile Operation, S. Sudirgo, R.P. Nandgaonkar, B. Curanovic
Monolithically Integrated Si/Sige Resonant Interband Tunnel Diode/Cmos Demonstrating Low Voltage Mobile Operation, S. Sudirgo, R.P. Nandgaonkar, B. Curanovic
Articles
The first demonstration of the monolithic integration of CMOS and Si/SiGe resonant interband tunnel diodes (RITD) with negative differential resistance (NDR) is reported in this paper. The Si/SiGe RITDs exhibited a peak-to-valley current ratio (PVCR) up to 2.8 and peak current density (Jp) of 0.26 kA/cm2 at room temperature. This study focused on the utilization of a pair of tunnel diodes connected in series to form a latch. Employing a FET to supply current into the latch, a RITD/NMOS monostable–bistable transition logic element (MOBILE) was realized. The latch exhibited a voltage swing of 84% at an applied supply voltage of …
Functional Derivatives Of [4-Amino-N,N'-Bis-(2-Hydroxybenzidene)-1,2-Phenylenediaminato][N,N'-Bis(2-Hydroxybenzidene)-1,2-Phenylenediaminato]Zirconium(Iv),Zr(Adsp)(Rdsp), For Use As Pendent Groups, Marvin Illingsworth, Wei Wang, Kenneth Hughes
Functional Derivatives Of [4-Amino-N,N'-Bis-(2-Hydroxybenzidene)-1,2-Phenylenediaminato][N,N'-Bis(2-Hydroxybenzidene)-1,2-Phenylenediaminato]Zirconium(Iv),Zr(Adsp)(Rdsp), For Use As Pendent Groups, Marvin Illingsworth, Wei Wang, Kenneth Hughes
Articles
The objective of this research was to prepare a variety of functional group derivatives of the eight-coordinate complex [4-amino-N,N'-bis(2-hydroxybenzidene)-1,2-phenylenediaminato] [N,N'-bis(2-hydroxybenzidene)-1,2-phenylenediaminato]zirconium(IV), Zr(adsp)(dsp), for use as pendent groups on polymers. The synthetic method involved reaction of the free ligands di-2-hydroxybenzylidende-4-nitro-N,N'-phenylenediamine [H2(ndsp)] and a functional group derivative of di-2-hydroxybenzylidene-N,N'-phenylenediamine [H2(Rdsp), R = methyl, 3-methoxy, 5-methoxy, cyano, pyridyl nitrogen, and 3-fluoro substituents] with zirconium tetra-n-butoxide in 1:1:1 mole ratio, followed by column separation on silica gel and hydrogenation of the nitro group to amino group using hydrogen gas over Pd/C catalyst. The order of the latter two steps was chosen to affect the best …
Enhancing Both Network And User Performance For Netwoks Supporting Best Effort Traffic, Shanchieh Yang, Gustavo De Veciana
Enhancing Both Network And User Performance For Netwoks Supporting Best Effort Traffic, Shanchieh Yang, Gustavo De Veciana
Articles
With a view on improving user-perceived performance on networks supporting best effort flows, e.g., multimedia/ data file transfers, we propose a family of bandwidth allocation criteria that depends on the residual work of on-going transfers. Analysis and simulations show that allocating bandwidth in this fashion can significantly improve the user-perceived delay, bit transmission delay, and throughput over traditional approaches, e.g., by 58% on an 80% loaded linear network. A simple implementation based on TCP Reno, exemplifies how one might approach practically realizing such gains. We discuss several other advantages of incorporating such differentiation at the transport level. In particular we …
Spectral Redundancy In A Six-Ink Ink Jet Printer, Mitchell Rosen, Edward Hattenberger, Noboru Ohta
Spectral Redundancy In A Six-Ink Ink Jet Printer, Mitchell Rosen, Edward Hattenberger, Noboru Ohta
Articles
We demonstrate for the multi- ink printers investigated that there are many spectral reflectances that can be produced approximately by a single printer through a large variety of different ink combinations. This spectral redundancy was evaluated for a pair of six- ink ink jet CMYKGO printers. Through use of the lookup tables, density maps were built illustrating the six- dimensional distribution of redundancy throughout colorant space. A tolerance of 0.01 RMS showed none of the inks in our CMYKGO systems to be fully replaceable by combinations of the other inks. However, when the tolerance was relaxed to 0.02 RMS, the …
A Psychophysical Experiment Evaluating The Color And Spatial Image Quality Of Several Multispectral Image Capture Techniques, Ellen Day, Roy Berns, Lawrence Taplin
A Psychophysical Experiment Evaluating The Color And Spatial Image Quality Of Several Multispectral Image Capture Techniques, Ellen Day, Roy Berns, Lawrence Taplin
Articles
Theoretically, there can be a compromise between color and spatial image quality for multispectral imaging: Increasing the number of channels increases spectral and colorimetric accuracy, that is, color quality increases; decreasing the number of channels reduces image noise and other spatial artifacts, that is, spatial image quality increases. Two paired comparison psychophysical experiments were performed to scale color and spatial image quality in order to better understand this compromise. Test targets, a watercolor painting, and several dioramas were imaged using three-, six-, and 31- channel image acquisition systems. One of the three- channel systems was a professional grade trichromatic digital …
Six Color Printer Characterization Using An Optimized Cellular Yule-Nielsen Spectral Neugebauer Model, Yongda Chen, Roy Berns, Lawrence Taplin
Six Color Printer Characterization Using An Optimized Cellular Yule-Nielsen Spectral Neugebauer Model, Yongda Chen, Roy Berns, Lawrence Taplin
Articles
A printer characterization attempts to map, in both directions, corresponding points in colorant and colorimetric spaces. Two limiting approaches are used: analytical models based on a small number of samples, and direct measurement and interpolation requiring many samples. For six-color printers, the former approach often has insufficient accuracy whereas the latter approach requires an excessive number of samples. An intermediate approach was used to characterize a CMYKGO ink jet printer, the Cellular-Yule-Nielsen-Spectral-Neugebauer (CYNSN) model. This model included an optimized Yule-Nielsen n value and onedimensional look-up tables between digital data and effective area coverage for each colorant. Each colorant was divided …
Technical Assistance Programs And The Diffusion Of Environmental Technologies In The Printing Industry: The Case Of Smes, Sandra Rothenberg, Monica Becker
Technical Assistance Programs And The Diffusion Of Environmental Technologies In The Printing Industry: The Case Of Smes, Sandra Rothenberg, Monica Becker
Articles
The goal of this article is to better understand the diffusion of environmentally preferable manufacturing technology (as distinct from pollution control technology) in small-and medium-sized firms (SMEs) and the influence of technical assistance programs on the diffusion of these technologies. The authors draw their insights from the printing industry, a sector where small firms predominate. They find that smaller firms lag slightly in the adoption of environmental technologies. With regard to technical assistance, they find that printers identify suppliers and other industry sources as more useful than government in providing information that leads to active exploration of new environmental technologies. …