Open Access. Powered by Scholars. Published by Universities.^{®}
Physical Sciences and Mathematics Commons^{™}
Open Access. Powered by Scholars. Published by Universities.^{®}
 Discipline

 Social and Behavioral Sciences (4444)
 Physics (4412)
 Computer Sciences (4290)
 Life Sciences (3214)
 Chemistry (2816)

 Engineering (2759)
 Medicine and Health Sciences (2596)
 Mathematics (2181)
 Earth Sciences (1919)
 Environmental Sciences (1834)
 Statistics and Probability (1626)
 Oceanography and Atmospheric Sciences and Meteorology (1391)
 Astrophysics and Astronomy (1196)
 Business (936)
 Applied Mathematics (911)
 Databases and Information Systems (841)
 Communication (668)
 Marine Biology (657)
 Bioinformatics (612)
 Communication Technology and New Media (609)
 Education (605)
 OS and Networks (593)
 Psychology (561)
 Science and Technology Studies (556)
 Biostatistics (554)
 Electrical and Computer Engineering (552)
 Chemical Engineering (528)
 Software Engineering (511)
 Optics (474)
 Institution

 Selected Works (21278)
 SelectedWorks (1943)
 University of Massachusetts Amherst (1005)
 Iowa State University (628)
 Utah State University (202)

 University of Massachusetts  Amherst (102)
 Boise State University (78)
 Georgia Southern University (75)
 San Jose State University (58)
 Western Kentucky University (40)
 Wesleyan University (37)
 University of Wollongong (31)
 Eastern Illinois University (27)
 Wright State University (21)
 EmbryRiddle Aeronautical University (20)
 Kent State University (19)
 Trinity University (16)
 University of South Florida (16)
 Macalester College (15)
 James Madison University (13)
 Widener Law (12)
 Western Washington University (11)
 Bowling Green State University (11)
 University of Texas at El Paso (9)
 Liberty University (9)
 Melbourne Business School (5)
 University of Massachusetts Boston (5)
 Sacred Heart University (5)
 SUNY Plattsburgh (4)
 Syracuse University (4)
 Keyword

 Computer Science and Engineering (418)
 Articles (287)
 Otto Vogl (221)
 History of Polymer Science (192)
 Journal Articles (181)

 Publications (156)
 CMMB (136)
 For (134)
 Galaxies: evolution (133)
 GeoQUEST (121)
 Australia (111)
 Published Research Papers (106)
 Analysis (102)
 Climate change (91)
 Physics (90)
 Education (90)
 Refereed Publications (87)
 Chemistry (86)
 System (85)
 Environmental Law (85)
 Privacy (79)
 Systems (77)
 Computer science (77)
 Air pollutants (77)
 Sustainability (76)
 Conference Papers (76)
 04. Personalities in Polymer Science (74)
 Architecture Arts and Humanities Business Education Engineering Law Life Sciences Medicine and Health Sciences Physical Sciences and Mathematics Social and Behavioral Sciences (74)
 Galaxies: formation (71)
 Humans (71)
 Publication Year
 Publication

 Daryl Bagley (374)
 Amit P. Sheth (351)
 Professor Jennifer Seberry (277)
 Otto Vogl (273)
 Panos Kevrekidis (217)

 Barry R Holstein (211)
 John R Rice (175)
 Aaron J. Romanowsky (146)
 Alif Nur (135)
 kutil kelamin Ampuh (133)
 Mark R. Anderson (132)
 Robert Oleniacz (127)
 David LO (126)
 Associate Professor Edward D Burton (124)
 Joseph C Makarewicz (120)
 Andrew McCallum (120)
 William F. Trench (120)
 Gordon Wallace (112)
 John Donoghue (112)
 Shi Xue Dou (109)
 Mark S. Gordon (108)
 Professor Katina Michael (103)
 George K. Thiruvathukal (101)
 Benne Holwerda (101)
 Richard C. Holz (101)
 Arun Bansil (98)
 Bela G. Fejer (96)
 Pran Nath (94)
 Jeremy Straub (88)
 Richard Ignace (87)
Articles 1  30 of 25727
FullText Articles in Physical Sciences and Mathematics
Merk Obat Kencing Nanah Pada Pria Di Apotik Resep Dokter Kelamin, Riza Rihanna
Merk Obat Kencing Nanah Pada Pria Di Apotik Resep Dokter Kelamin, Riza Rihanna
Riza Rihanna
The Biased Media And Their Utilization Of Propaganda: The True Obstructionists Of World Events And Our Minds, David B. Ross, Gina Peyton, Melissa Tara Sasso, Rande Matteson, Cortney Matteson
The Biased Media And Their Utilization Of Propaganda: The True Obstructionists Of World Events And Our Minds, David B. Ross, Gina Peyton, Melissa Tara Sasso, Rande Matteson, Cortney Matteson
Dr. Melissa Tara Sasso
These 5 Simple Keto Zone Tricks Will Pump Up Your Sales Almost Instantly, Keto Healthys
These 5 Simple Keto Zone Tricks Will Pump Up Your Sales Almost Instantly, Keto Healthys
keto healthys
Stock@>> Https://Slimtonediets.Com/PerfectKetoMax/, Jamesrtq Jamesrtq
Stock@>> Https://Slimtonediets.Com/PerfectKetoMax/, Jamesrtq Jamesrtq
Jamesrtq Jamesrtq
Source Function Of Na, Xuguang Cai
Source Function Of Na, Xuguang Cai
Xuguang Cai
Co2 Levels And Climate Change During Early Eocene Hyperthermals, Ying Cui
Co2 Levels And Climate Change During Early Eocene Hyperthermals, Ying Cui
Ying Cui
Early Eocene (56 to 33.9 million years ago) is punctuated by a series of rapid and extreme global warming events, known as the ‘hyperthermals’, triggered by massive release of carbon dioxide. Despite the carbon emission rate might have been ten times smaller than the current emission from burning fossil fuels and cement production, the early Eocene hyperthermals are considered one of the best analogues for CO2 concentration projected into the future. The temperature records are well established from deep sea sediments during these hyperthermals, but the CO2 levels in the atmosphere remain poorly known, partly due to the lack ...
Marine Sediment Record From The East Antarctic Margin Reveals Dynamics Of Ice Sheet Recession, Amy Leventer, Eugene Domack, Jennifer Pike, Catherine Stickley, Eleanor Maddison, Stefanie A. Brachfeld, Patricia Manley, Charlie Mcclennen
Marine Sediment Record From The East Antarctic Margin Reveals Dynamics Of Ice Sheet Recession, Amy Leventer, Eugene Domack, Jennifer Pike, Catherine Stickley, Eleanor Maddison, Stefanie A. Brachfeld, Patricia Manley, Charlie Mcclennen
Stefanie Brachfeld
The Antarctic shelf is traversed by largescale troughs developed by glacial erosion. Swath bathymetric, lithologic, and chronologic data from jumbo piston cores from four sites along the East Antarctic margin (Iceberg Alley, the Nielsen Basin, the Svenner Channel, and the MertzNinnis Trough) are used to demonstrate that these crossshelf features controlled development of calving bay reentrants in the Antarctic ice sheet during deglaciation. At all sites except the MertzNinnis Trough, the transition between the Last Glacial Maximum and the Holocene is characterized by varved couplets deposited during a short interval of extremely high primary productivity in a fjordlike setting. Nearly ...
Properties Of New York/New Jersey Harbor Sediments, K. W. Jones, Huan Feng, E. A. Stren, U. Neuhäusler, J. Osán, N. Marinkovic, Z. Song
Properties Of New York/New Jersey Harbor Sediments, K. W. Jones, Huan Feng, E. A. Stren, U. Neuhäusler, J. Osán, N. Marinkovic, Z. Song
Huan Feng
Sediments found in waterways around the world may contain toxic compounds of anthropogeilic origin that can harm the environment and human health. As a result, it is often necessary to remove them and find disposal methods that are environmentally and economically acceptable. Here, we report on results obtained in an experimental program to characterize the nature of the sediment contamination. The objective was to gain a better understanding of the properties of the sediments to develop better methods for understanding the fate and transport of the contaminants and for improving methods for their removal from the sediments. Our investigations made ...
Urban Environmental Pollution 2010: Trace Metal Dispersion In Soil From AutoMechanic Village To Urban Residential Areas In Owerri, Nigeria, Michael A. Nwachukwu, Huan Feng, Jude Alinnor
Urban Environmental Pollution 2010: Trace Metal Dispersion In Soil From AutoMechanic Village To Urban Residential Areas In Owerri, Nigeria, Michael A. Nwachukwu, Huan Feng, Jude Alinnor
Huan Feng
Due to poor waste management in mechanic villages (MVs), average metal concentration (mgkg1) is Pb 1162±572; Mn 864±531; Cu 385±202; Fe 49259±4770; Cd 20±13; Zn 824±190; and Ni 40±35, causing ecological and public health risks in parts of Nigeria. Average metal dispersion (mgkg1/m) from MVs to residential areas was estimated at 9.2 for Pb; 6.7 for Mn; 6.1 for Zn; 1.5 for Cu; 197 for Fe; 0.3 for Ni; and 0.04 for Cd. This represents a mobility order of Fe>Pb>Mn>Zn>Cu>Ni>Cd ...
Magnetic Mineral Diagenesis In The River‐Dominated Inner Shelf Of The East China Sea, China, Can Ge, Weiguo Zhang, Chenyin Dong, Yan Dong, Jinyan Liu, Nguyen Thi Thu Hien, Huan Feng, Lizhong Yu
Magnetic Mineral Diagenesis In The River‐Dominated Inner Shelf Of The East China Sea, China, Can Ge, Weiguo Zhang, Chenyin Dong, Yan Dong, Jinyan Liu, Nguyen Thi Thu Hien, Huan Feng, Lizhong Yu
Huan Feng
The inner shelf of the East China Sea is a riverdominated margin characterized by finegrained mud deposits and a rapid sedimentation rate. Three short sediment cores (similar to 2.7m in length) were examined to characterize spatial variations in magnetic mineral diagenesis. The sediment cores were analyzed for sedimentation rates, magnetic properties, particle size distribution, organic carbon, and total sulfur content. The two more proximal cores with higher sedimentation rates (similar to 2.2cm/yr and similar to 0.96cm/yr) do not exhibit obvious effects of reductive dissolution of magnetite with increasing depth, which is consistent with their lower ...
Evidence For Exocellular Arsenic In Fronds Of Pteris Vittata, Rupali Datta, Padmini Das, Ryan Tappero, Pravin Punamiya, Evert Elzinga, Shivendra Sahi, Huan Feng, Jeffrey Kiiskila, Dibyendu Sarkar
Evidence For Exocellular Arsenic In Fronds Of Pteris Vittata, Rupali Datta, Padmini Das, Ryan Tappero, Pravin Punamiya, Evert Elzinga, Shivendra Sahi, Huan Feng, Jeffrey Kiiskila, Dibyendu Sarkar
Huan Feng
The arsenic (As) hyperaccumulating fern species Pteris vittata (PV) is capable of accumulating large quantities of As in its aboveground tissues. Transformation to AsIII and vacuolar sequestration is believed to be the As detoxification mechanism in PV. Here we present evidence for a preponderance of exocellular As in fronds of Pteris vittata despite numerous reports of a tolerance mechanism involving intracellular compartmentalization. Results of an extraction experiment show that 43–71% of the As extruded out of the fronds of PV grown in 0.67, 3.3 and 6.7mM AsV. SEMEDX analysis showed that As was localized largely on ...
Enhancing Digestibility And Ethanol Yield Of Populus Wood Via Expression Of An Engineered Monolignol 4OMethyltransferase, Yuanheng Cai, Kewei Zhang, Hoon Kim, Guichuan Hou, Xuebin Zhang, Huijun Yang, Huan Feng, Lisa Miller, John Ralph, ChangJun Liu
Enhancing Digestibility And Ethanol Yield Of Populus Wood Via Expression Of An Engineered Monolignol 4OMethyltransferase, Yuanheng Cai, Kewei Zhang, Hoon Kim, Guichuan Hou, Xuebin Zhang, Huijun Yang, Huan Feng, Lisa Miller, John Ralph, ChangJun Liu
Huan Feng
Producing cellulosic biofuels and biobased chemicals from woody biomass is impeded by the presence of lignin polymer in the plant cell wall. Manipulating the monolignol biosynthetic pathway offers a promising approach to improved processability, but often impairs plant growth and development. Here, we show that expressing an engineered 4Omethyltransferase that chemically modifies the phenolic moiety of lignin monomeric precursors, thus preventing their incorporation into the lignin polymer, substantially alters hybrid aspens’ lignin content and structure. Woody biomass derived from the transgenic aspens shows a 62% increase in the release of simple sugars and up to a 49% increase in the ...
ViscoElastic Properties Of Duct Tape, Ashley Brown, Ulrich Zurcher
ViscoElastic Properties Of Duct Tape, Ashley Brown, Ulrich Zurcher
Ulrich Zurcher
A simple experiment for determining the nonlinear stress–strain relation of duct tape is described. After weights are added and subsequently removed, the tape does not return to its original state and is no longer taut. The tape exhibits hysteresis, which implies the loss of work during the cyclical process. The exponent describing the nonlinearity is related to the fractional work loss.
Torque Around The Center Of Mass: Dynamic Stability During Quadrupedal Arboreal Locomotion In The Siberian Chipmunk (Tamias Sibiricus), Andrew R. Lammers, Ulrich Zurcher
Torque Around The Center Of Mass: Dynamic Stability During Quadrupedal Arboreal Locomotion In The Siberian Chipmunk (Tamias Sibiricus), Andrew R. Lammers, Ulrich Zurcher
Ulrich Zurcher
When animals travel on tree branches, avoiding falls is of paramount importance. Animals swiftly running on a narrow branch must rely on movement to create stability rather than on static methods. We examined how Siberian chipmunks (Tamias sibiricus) remain stable while running on a narrow tree branch trackway. We examined the pitch, yaw, and rolling torques around the center of mass, and hypothesized that within a stride, any angular impulse (torque during step time) acting on the center of mass would be canceled out by an equal and opposite angular impulse. Three chipmunks were videotaped while running on a 2 ...
Thermal Fluctuations In Systems With Continuous Symmetry, Ulrich Zürcher
Thermal Fluctuations In Systems With Continuous Symmetry, Ulrich Zürcher
Ulrich Zurcher
We investigate relaxation and thermal fluctuations in systems with continuous symmetry in arbitrary spatial dimensions. For the scalar order parameter ζ(r, t) with r∈ℛd, the deterministic relaxation is caused by hydrodynamic modes η∂ζ(r, t)/∂t= K∇2ζ(r, t). For a finite volume V, we expand the scalar field in a discrete Fourier series and then we study the behavior in the limit V→∞. We find that the second moment is well defined for dimensions d≥3, while it diverges for d=1, 2. Furthermore, we show that for d<4, the decay of the scalar field does not define an "effective" relaxation time. For dimensions d<4, these two properties suggest scaleinvariant properties of the scalar field in the limit V→∞. We show that thermal fluctuations are described by fractional Brownian motion for d ≤ 3 and by ordinary Brownian motion for d ≥ 4. The spectral density of the stochastic force follows 1/f for d=1 and d=2, for d=3, and "white noise," f0 for d≥4. We find explicit representation of the equilibrium distribution of the conserved scalar field. For d≥4 it is a Gaussian distribution, while for d=1 and d=2, it is the Cauchy distribution.
Thermally Activated Escape Over Fluctuating Barriers, Ulrich Zürcher, Charles R. Doering
Thermally Activated Escape Over Fluctuating Barriers, Ulrich Zürcher, Charles R. Doering
Ulrich Zurcher
We investigate the thermally activated escape of a Brownian particle over a potential barrier whose height fluctuates with a rate α between the values E+ and E−. We are mainly interested in the lowtemperature behavior where E+/T≫E−/T. We calculate the mean exit time as a function of the rate of the barrier fluctuations for the piecewise linear and the piecewise constant barrier, τ=τ(α). For the piecewise constant potential we find three different regimes: τ∼τ+ for α<τ−1+=exp(E+/T), τ∼2τ− for α>τ−1−=exp(E−/T), and τ∼α−1 for τ−1+<α<τ−1−. The mean exit time for the piecewise linear potential has a different behavior for fast barrier fluctuations, α>τ−1−; τ(α) is a ...
Scaling Behavior Of Fluctuations In Systems With Continuous Symmetry, Ulrich Zürcher
Scaling Behavior Of Fluctuations In Systems With Continuous Symmetry, Ulrich Zürcher
Ulrich Zurcher
In nematic liquid crystals, director fluctuations correpond to the dynamical mode that is critical for all temperatures in zero external fields. The Hurst exponent characterizes the temporal behavior of the mean square displacement of director fluctuations, 〈[δn(r,t)δn(r,0)]2〉∼t2H. We find H=1/2 in finite fields and H=3/4 in zero field. This result differs from that of Zhang et al. [Phys. Rev. Lett. 70, 1834 (1993)] who find a Hurst exponent that varies continuously from H≃1 in zero field to H≃1/2 in moderate fields.
Radial Motion In A Central Potential For Singular Mass Densities, Ulrich Zürcher, Miron Kaufman
Radial Motion In A Central Potential For Singular Mass Densities, Ulrich Zürcher, Miron Kaufman
Ulrich Zurcher
We study the radial motion of an object in the gravitational field produced by an isotropic mass density that is singular at the origin. This problem applies to elliptical galaxies and can be used to illustrate motion in a central field appropriate for an intermediatelevel mechanics course.
QuantumMechanical Harmonic Chain Attached To Heat Baths Ii: Nonequilibrium Properties, Ulrich Zürcher, Peter Talkner
QuantumMechanical Harmonic Chain Attached To Heat Baths Ii: Nonequilibrium Properties, Ulrich Zürcher, Peter Talkner
Ulrich Zurcher
We study nonequilibrium properties of a onedimensional harmonic chain to whose ends independent heat baths are attached which are kept at different temperatures. Using the quantum Langevin equation approach, we determine the stationary nonequilibrium state for arbitrary temperatures and coupling strength to the heat baths. This allows us to discuss several typical nonequilibrium properties. We find that the heat flux through the chain is finite as the length of the chain goes to infinity, i.e., we recover the wellknown fact that the lattice thermal conductivity of the perfect harmonic chain is infinite. In the quantal case, the heat flux ...
QuantumMechanical Harmonic Chain Attached To Heat Baths I: Equilibrium Properties, Ulrich Zürcher, Peter Talkner
QuantumMechanical Harmonic Chain Attached To Heat Baths I: Equilibrium Properties, Ulrich Zürcher, Peter Talkner
Ulrich Zurcher
Starting from quantum Langevin equations for operators we study thermal properties of a onedimensional harmonic chain to whose ends independent heat baths are attached. In this paper, we mainly discuss the thermal equilibrium state that the chain eventually approaches if the heat baths are at equal temperatures. In the classical limit, this state is determined by the Gibbs ensemble of the free chain, whereas in the quantal case, this is only true if the strength of coupling between chain and heat baths is made infinitely small. We find that corrections for finite coupling strength are appreciable only in boundary layers ...
Geometric Constructions For Image Formation By A Converging Lens, Ulrich Zürcher
Geometric Constructions For Image Formation By A Converging Lens, Ulrich Zürcher
Ulrich Zurcher
Light rays emerge from an object in all directions. In introductory texts, three 'special' rays are selected to draw the image produced by lenses and mirrors. This presentation may suggest to students that these three rays are necessary for the formation of an image. We discuss that the three rays attain their 'special status' from the geometric solution of the equation of a hyperbola x−1 + y−1 = c−1 (mirror/lens equation). The material is suitable for use in introductory courses for science majors.
Electrostatics At The Molecular Level, Ulrich Zurcher
Electrostatics At The Molecular Level, Ulrich Zurcher
Ulrich Zurcher
In molecular systems, positive and negative charges are separated, making them ideal systems to examine electrostatic interactions. The attractive force between positive and negative charges is balanced by repulsive ‘forces’ that are quantummechanical in origin. We introduce an ‘effective’ potential energy that captures the repulsion; it allows us to obtain fairly accurate estimates of the bonding properties of molecular systems. We use units (e.g., kcal mol–1 for energy) that emphasize the relevance of electrostatics to macroscopic behavior.
Comment On A Critique Of The Instantaneous Normal Mode (Inm) Approach To Diffusion, T. Keyes, Wu Xiong Li, Ulrich Zurcher
Comment On A Critique Of The Instantaneous Normal Mode (Inm) Approach To Diffusion, T. Keyes, Wu Xiong Li, Ulrich Zurcher
Ulrich Zurcher
A critique of the instantaneous normal mode (INM) theory of diffusion by Gezelter, Rabani, and Berne (GRB) [J. Chem. Phys. 107, 4618 (1997)] is analyzed. GRB assert that imaginaryfrequency INM are corrupted with modes unrelated to barrier crossing, that proposals for removing such nondiffusive (ND) modes are inadequate, and thus that INM cannot be used to predict the selfdiffusion constant, D. In rebuttal it is argued that LennardJones, the system studied by GRB, is anamolously rich in ND modes. INM in molecular liquids are shown to behave as excellent indicators of barrier crossing. Even in LJ NDINM, while plentiful, do ...
An Instantaneous Normal Mode Description Of Relaxation In Supercooled Liquids, T. Keyes, G. V. Vijayadamodar, Ulrich Zurcher
An Instantaneous Normal Mode Description Of Relaxation In Supercooled Liquids, T. Keyes, G. V. Vijayadamodar, Ulrich Zurcher
Ulrich Zurcher
Relaxation in supercooled liquids is formulated from the instantaneous normal modes (INM) point of view. The frequency and temperature dependence of the unstable, imaginary frequency lobe of the INM density of states, ⟨ρu(ω,T)⟩ (for simplicity we write ω instead of iω), is investigated and characterized over a broad temperature range, 10⩾T⩾0.42, in the unit density LennardJones liquid. INM theories of diffusion invoke Imω modes descriptive of barrier crossing, but not all imaginary frequency modes fall into this category. There exists a cutoff frequency ωc such that modes with ω<ωc correspond to “shoulder potentials,” whereas the potential profiles include barriercrossing double wells for ω>ωc. Given that only modes with ...
Anharmonic Potentials In Supercooled Liquids: The SoftPotential Model, Ulrich Zürcher, T. Keyes
Anharmonic Potentials In Supercooled Liquids: The SoftPotential Model, Ulrich Zürcher, T. Keyes
Ulrich Zurcher
Instantaneous normal modes (INM) are the harmonic approximation to liquid dynamics. This is an extension of the phonon description of lattice dynamics, in which case Bloch's theorem shows that all modes are extended. Longrange order is destroyed in liquids and glasses, and the INM spectrum has contributions from both extended and localized modes. We use the softpotential mode to describe localized modes. This model is a hightemperature extension of the standard twolevelsystem model for glasses. The equilibrium position of any atom in the liquid has only temporary character, and relaxation processes in the liquid are associated with particles hopping ...
Dephasing Processes In Glasses With Strong Strain Interactions, Ulrich Zürcher, R. Silbey
Dephasing Processes In Glasses With Strong Strain Interactions, Ulrich Zürcher, R. Silbey
Ulrich Zurcher
Spectral diffusion decay is calculated for a glass modeled by two level systems which are strongly coupled to phonons. The spinphonon interaction induces an effective spinspin interaction which dominates the energy scale. We show that spectral diffusion is a property of macroscopic local fields which fluctuate on time scales that are much longer than the spinphonon relaxation time T1. We assume for the spectral diffusion a Gaussian distribution and derive a selfconsistent equation for its variance which is nonlocal in time. At high temperatures, the variance grows linearly with time while at low temperatures, we find strong deviations from simple ...
Configurational Entropy And Collective Modes In Normal And Supercooled Liquids, Ulrich Zürcher, T. Keyes
Configurational Entropy And Collective Modes In Normal And Supercooled Liquids, Ulrich Zürcher, T. Keyes
Ulrich Zurcher
Soft vibrational modes have been used to explain anomalous thermal properties of glasses above 1 K. The softpotential model consists of a collection of doublewell potentials that are distorted by a linear term representing local stress in the liquid. Doublewell modes contribute to the configurational entropy of the system. Based on the AdamGibbs theory of entropically driven relaxation in liquids, we show that the presence of stress drives the transition from Arrhenius to ZwanzigBässler temperature dependence of relaxation times. At some temperature below the glass transition, the energy scale is dominated by local stress, and soft modes are described by ...
A Stochastic Theory Of Inhomogeneously Broadened Linewidths In Solids, Ulrich Zürcher
A Stochastic Theory Of Inhomogeneously Broadened Linewidths In Solids, Ulrich Zürcher
Ulrich Zurcher
We investigate spectral diffusion decay using a model for solids that consists of twolevelsystems (TLSs) interacting via strain fields. For the case when the rate of TLS flips vanishes, we find algebraic decay of correlation functions of the local field. We show that properties of equilibrium fluctuations are in agreement with the hierarchical picture proposed by Basché and Moerner: TLSs far away produce fast fluctuations that are small in magnitude, and close TLSs produce large fluctuations that are less frequent.
A New Optimization Algorithm For Single Hidden Layer Feedforward Neural Networks, Leong Kwan Li, Sally Shao, KaFai Cedric Yiu
A New Optimization Algorithm For Single Hidden Layer Feedforward Neural Networks, Leong Kwan Li, Sally Shao, KaFai Cedric Yiu
Sally Shao
Feedforward neural networks are the most commonly used function approximation techniques in neural networks. By the universal approximation theorem, it is clear that a singlehidden layer feedforward neural network (FNN) is sufficient to approximate the corresponding desired outputs arbitrarily close. Some researchers use genetic algorithms (GAs) to explore the global optimal solution of the FNN structure. However, it is rather time consuming to use GA for the training of FNN. In this paper, we propose a new optimization algorithm for a singlehidden layer FNN. The method is based on the convex combination algorithm for massaging information in the hidden layer ...
DiscreteTime Recurrent Neural Network And Its Application To Compression Of InfraRed Spectrum, LeongKwan Li, Sally S. L. Shao
DiscreteTime Recurrent Neural Network And Its Application To Compression Of InfraRed Spectrum, LeongKwan Li, Sally S. L. Shao
Sally Shao
We study the discretetime recurrent neural network that derived from the Leakyintegrator model and its application to compression of infrared spec trum. Our results show that the discretetime Leakyintegrator recurrent neural network (RNN) model can be used to approximate the continuoustime model and inherit its dynamical characters if a proper step size is chosen. Moreover, the discretetime Leakyintegrator RNN model is absolutely stable. By developing the double discrete integral method and employing the state space search algorithm for the discretetime recurrent neural network model, we demonstrate with quality spectra regenerated from the compressed data how to compress the infrared spectrum ...