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Search Results: 1 - 10 of 204636 matches for " E. E. Lin "
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Cluster Model of Formation of Subnuclear and Subatomic Objects  [PDF]
E. E. Lin
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.53018
Abstract:

The paper describes the development results on one-dimensional (1D) asymptotic model of the formation kinetics for the objects (clusters) of subnuclear (quark) and subatomic (nuclear) matters. A concept of the objects distribution density wave φ(a, t) in space of sizes a lies in the basis for analytical description of the processes under consideration. The proposed formalism makes it possible to describe in an adequate way the final outcomes of the well-known catastrophic phenomena in the world of elementary particles. Mass characteristics of different processes of approach to equilibrium in nuclear reactions are calculated.

Local energy decay for waves governed by a system of nonlinear Shr dinger equations in a nonuniform medium
J. E. Lin
International Journal of Mathematics and Mathematical Sciences , 1985, DOI: 10.1155/s0161171285000679
Abstract: We show that the local energy of a smooth localized solution to a system of coupled nonlinear Shr dinger equations in a certain nonuniform medium decays to zero as the time approaches infinity.
Safety and Efficacy of Pediatric General Anesthesia by Laryngeal Mask Airway Without Intravenous Access  [PDF]
Benjamin A. Lin BSc, Zakaria S Messieha, William E Hoffman
International Journal of Clinical Medicine (IJCM) , 2011, DOI: 10.4236/ijcm.2011.23057
Abstract: The safety and efficacy of the laryngeal mask airway (LMA) has been reported by numerous large-scale studies. However, they do not address the issue of whether an intravenous (IV) is required for pediatric general anesthesia (GA) where access is challenging due to anatomical considerations and a lack of cooperation. The aims of this study are to determine whether pediatric GA by LMA without IV access affected placement rates, procedure times and rates of anesthetic complications. Children who met these criteria at the UIC Surgicenter in the two year period prior to August 30, 2005 were selected. A retrospective chart review was conducted to determine patient demographics, ASA class, procedure, placement success, IV placed if any, time to incision, and any anesthetic complications. 241 patients without IV access and 41 patients with IV access were included. No significant differences were found between the groups in the rates of LMA placement or anesthetic complications. Significant differences were found in times to incision overall and for ophthalmology exams under anesthesia and lacrimal duct probings. Pediatric GA by LMA without IV access demonstrated a similarly high placement rate, shorter procedure times and a low rate of complications in comparison with the control group.
Efficient iterative method for solving the Dirac-Kohn-Sham density functional theory
Lin Lin,Sihong Shao,Weinan E
Physics , 2012, DOI: 10.1016/j.jcp.2013.03.030
Abstract: We present for the first time an efficient iterative method to directly solve the four-component Dirac-Kohn-Sham (DKS) density functional theory. Due to the existence of the negative energy continuum in the DKS operator, the existing iterative techniques for solving the Kohn-Sham systems cannot be efficiently applied to solve the DKS systems. The key component of our method is a novel filtering step (F) which acts as a preconditioner in the framework of the locally optimal block preconditioned conjugate gradient (LOBPCG) method. The resulting method, dubbed the LOBPCG-F method, is able to compute the desired eigenvalues and eigenvectors in the positive energy band without computing any state in the negative energy band. The LOBPCG-F method introduces mild extra cost compared to the standard LOBPCG method and can be easily implemented. We demonstrate our method in the pseudopotential framework with a planewave basis set which naturally satisfies the kinetic balance prescription. Numerical results for Pt$_{2}$, Au$_{2}$, TlF, and Bi$_{2}$Se$_{3}$ indicate that the LOBPCG-F method is a robust and efficient method for investigating the relativistic effect in systems containing heavy elements.
Nuclear Power Plant Instrumentation Fault Detection Using Fuzzy Logic
Keith E. Holbert,Kang Lin
Science and Technology of Nuclear Installations , 2012, DOI: 10.1155/2012/421070
Abstract: Economic constraints are driving the electric power industry to seek improved methods for monitoring, control, and diagnostics. To increase plant availability, various techniques have been implemented in industry to assess equipment condition to prevent system inoperability. The availability of a large number of measured signals and additional component information and the increasing number of signal processing options to analyze sampled data motivate the assimilation of such diverse information into a plantwide condition monitor. The use of fuzzy logic is described herein for the purpose of performing the decision making regarding the system status and the possible need for component maintenance. Fuzzy-logic-based diagnostic monitoring is applied to data acquired from instrumentation within operating facilities. 1. Introduction Competition due to the deregulation of the electric power industry has provided additional motivation for power plant owners to implement predictive maintenance (PM) programs. Equipment health monitoring is known by a variety of related endeavors including condition-based and reliability-centered maintenance. To accomplish the PM without interrupting equipment operation necessitates the use of online monitoring tools for signature analysis. Those signatures, in turn, must be scrutinized to ascertain whether the system or component is trending toward a failure condition. The originating signals are often the result of stochastic (random) processes. Figure 1 illustrates three basic approaches to equipment maintenance. Corrective (or reactive) maintenance is taken only after the component has failed. To avert breakdown, preventive approaches involve anticipatory actions based on a schedule or prediction. Scheduled maintenance, which may involve inspections and/or preemptive replacements, can be performed on either calendar or equipment use bases. Predictive maintenance is initiated because of a detected onset of equipment malfunction or failure. Reliability-centered maintenance incorporates all three approaches while considering the importance of the equipment to the facility mission and is generally based upon failure modes and effects analysis. Figure 1: Equipment maintenance approaches. The percentages represent the categorization of maintenance program in the USA and are taken from [ 8] based on a survey in 2000. The capability to detect faults and to replace the components just prior to failure is desired by industry. By doing so, the consequences of unexpected equipment failures can be avoided. Online component monitoring can
Development of a Wideband Highly Efficient GaN Vmcd VHF/UHF Power Amplifier
Song Lin;Aly E. Fathy
PIER C , 2011, DOI: 10.2528/PIERC10112306
Abstract: A 50 to 550 MHz wideband gallium nitride (GaN) HEMT power amplifier with over 43 dBm output power and 63% drain efficiency has been successfully developed. The demonstrated wideband power amplifier utilizes two GaN HEMTs and operates in a push-pull voltage mode Class D (VMCD). The design is based on a large signal simulation to optimize the power amplifier's output power and efficiency. To assure a wideband operation, a coaxial line impedance transformer has been used as part of the input matching network; meanwhile, a wideband a 1:1 ferrite loaded balun and low pass filters are utilized on the amplifier's output side instead of the conventional serial harmonic termination.
Inactivation of the Nucleus Accumbens Core or Medial Shell Attenuates Reinstatement of Sugar-Seeking Behavior following Sugar Priming or Exposure to Food-Associated Cues
Peagan Lin, Wayne E. Pratt
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0099301
Abstract: Re-exposure to either palatable food or to conditioned stimuli associated with food is known to reinstate food-seeking after periods of abstinence. The nucleus accumbens core and shell are important for reinstatement in both food- and drug-seeking paradigms, although their potential differential roles have been difficult to delineate due to methodological differences in paradigms across laboratories. The present studies assessed the effects of temporary inactivation of the core or shell on priming- and cue-induced reinstatement of food-seeking in identically-trained rats. Inactivation of either the nucleus accumbens core (Experiment 1A; N = 10) or medial shell (Experiment 1B; N = 12) blocked priming-induced reinstatement in an equivalent manner. Similarly, inactivation of the core or medial shell (Experiments 2A & 2B; N = 11 each) also blocked cue-induced reinstatement, although there was also a significant treatment day X brain region X drug order interaction. Specifically, rats with core inactivation reinstated lever-pressing on the vehicle injection day regardless of whether that was their first or second test, whereas rats that had medial shell inactivation on the first day did not significantly reinstate lever-pressing on the second day of testing (when they received vehicle). Yohimbine, while a reportedly robust pharmacological stressor, was ineffective at inducing reinstatement in the current stress-induced reinstatement procedure. These data suggest that both the nucleus accumbens core and shell serve important roles in reinstatement of food-seeking in response to priming and cues.
Emission and Cooling Processes in a Hybrid Thermal-Nonthermal Plasma
D. Lin,E. P. Liang
Physics , 1997, DOI: 10.1063/1.55296
Abstract: In a hybrid thermal-nonthermal plasma, we find that the dominant emission and absorption mechanisms are synchrotron by nonthermal electrons and bremsstrahlung by thermal electrons. These two processes significantly change the spectrum from inverse Compton scatterings at low energies. We also find that Coulomb collisions are effective in cooling down the lower energy electrons but do not significantly alter the emission pattern. Compton cooling is more effective in changing emission and absorption coefficients when the photon energy density is high.
Prediction of a new potential high-pressure structure of FeSiO$_3$
R. E. Cohen,Yangzheng Lin
Physics , 2014, DOI: 10.1103/PhysRevB.90.140102
Abstract: We predict a new candidate high-temperature high-pressure structure of FeSiO$_3$ with space-group symmetry Cmmm by applying an evolutionary algorithm within DFT+U that we call post-perovskite II (PPv-II). An exhaustive search found no other competitive candidate structures with ABO$_3$ composition. We compared the X-ray diffraction (XRD) pattern of FeSiO$_3$ PPv-II with experimental results of the recently reported H-phase of (Fe,Mg)SiO$_3$. The intensities and positions of two main X-ray diffraction peaks of PPv-II FeSiO$_3$ compare well with those of the H-phase. We also calculated the static equation of state, the enthalpy and the bulk modulus of the PPv-II phase and compared it with those of perovskite (Pv) and post-perovskite (PPv) phases of FeSiO$_3$. According to the static DFT+U computations the PPv-II phase of FeSiO$_3$ is less stable than Pv and PPv phases under lower mantle pressure conditions at 0 K and has a higher volume. PPv-II may be entropically stabilized, and may be a stable phase in Earth$'$s lower mantle, coexisting with $\alpha$-PbO$_2$ (Columbite-structured) silica and perovskite, or with magnesiowustite or ferropericlase, depending on bulk composition.
Spectral Properties of a Hybrid Thermal-Nonthermal Isotropic Plasma
D. Lin,E. P. Liang
Physics , 1998,
Abstract: The spectral properties of a hybrid steady thermal-nonthermal isotropic plasma are studied. The involved emission mechanisms are thermal bremsstrahlung, nonthermal bremsstrahlung, cyclotron and nonthermal synchrotron. Formulas are derived to calculate the emissivities and absorption coefficients of all these processes. Calculations show that the nonthermal synchrotron and the thermal bremsstrahlung dominate over most of the frequency range and that the cyclotron and the nonthermal bremsstrahlung are important only at the two ends of the spectrum. The combination of the two dominant processes could generate the synchrotron self-absorbed spectrum, the Rayleigh-Jeans spectrum and an absorbed flatter spectrum which is seen in some solar flare radio spectra. Absorbed spectra steeper than the three types of spectra are rare. The conditions for these three possible spectral types are given. Cyclotron harmonic features are seen in the emergent spectra from the hybrid plasmas. These harmonic features, useful in determining the magnetic field, exist only under certain conditions which are explored in this paper.
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