Quantum fluctuation (Total 263563 Papers Found)

[1] We present a reconstruction of global sea level (GSL) since 1700 calculated from tide gauge records and analyse the evolution of global sea level acceleration during the past 300 years. We provide observational evidence that sea level acceleration up to the present has been about 0.01 mm/yr and appears to have started at the end of the 18th century. Sea level rose by 6 cm during the 19th century and 19 cm in the 20th century. Superimposed on the long-term acceleration are quasiperiodic fluct ...
Clinical study found that early detection and intervention are essential for preventing clinical deterioration in patients, for patients both in intensive care units (ICU) as well as in general wards but under real-time data sensing (RDS). In this paper, we develop an integrated data mining approach to give early deterioration warnings for patients under real-time monitoring in ICU and RDS. Existing work on mining real-time clinical data often focus on certain single vital sign and specific dis ...
This work, for the first time, examines the work function fluctuation (WKF) and interface trap fluctuation (ITF) using experimentally calibrated 3D device simulation on high-κ / metal gate technology. The random WKs result in 36.7 mV threshold voltage fluctuation (σV<inf>th</inf>) for 16 nm N-MOSFETs with TiN gate, which is rather different from the result of averaged WKF (AWKF) method [1] due to localized random WK effect. The ITF affects the subthreshold region (the n ...
In the precise phase difference measurement, we developed the dual phase coincidence detection method combined with a common oscillator. There is a certain frequency difference between the common oscillator and the two standard frequency signals which have the same nominal frequency. Utilizing the phase coincidence detection and a suitable processing, the time interval with the phase difference information can be obtained, and without one cycle count error. The key technique is the phase coincid ...
In this paper, an optimal control scheme for reducing the fluctuation of residual gas fraction (RGF) under variational operating condition is developed by combining stochastic logical system approach with statistical learning method. The method estimating RGF from measured in-cylinder pressure is introduced firstly. Then, the stochastic properties of the RGF are analyzed according to statistical data captured by conducting experiments on a test bench equipped with a L4 internal combustion engine ...
We examine the spectral function of the single electron Green function at finite temperatures for the Tomonaga-Luttinger model which consists of the mutual interaction with only the forward scattering. The spectral weight, which is calculated as a function of the frequency with the fixed wave number, shows that several peaks originating in the excitation spectra of charge and spin fluctuations vary into a single peak by the increase of temperature. ...
In this paper, we investigate the variability of the drain current, induced by random doping fluctuation, of junctionless nanoscale double-gate transistors. Using accurate statistical and quantum-corrected Technology Computer Aided Design simulation (10 000 randomizations), we investigate the current variability as function of the gate and drain voltage (ranging from the OFF to the ON regime), the device doping, and the device geometry. The dispersion of the drain current in the ON regime is fou ...
As device sizes are downscaled to nanometer, Random Telegraph Noise (RTN) becomes dominant. It is indispensable to accurately estimate the effect of RTN. We propose an RTN simulation method for analog circuits. It is based on the charge trapping model. The RTN-induced threshold voltage fluctuation are replicated to attach a variable DC voltage source to the gate of a MOSFET by using Verilog-AMS. In recent decananometer processes, high-k (HK) materials are used in gate dielectrics to decrease the ...
Newton potential for DGP brane-world scenario is examined when the extra dimension is semi-infinite. The final form of the potential involves a self-adjoint extension parameter α, which plays a role of an additional mass (or distance) scale. The striking feature of Newton potential in this setup is that the potential behaves as seven-dimensional in long range when α is nonzero. For small α there is an intermediate range where the potential is five-dimensional. Five-dimensional Newton constant ...
We have developed a physical model for the non-perturbative x-shape of parton density functions in the proton, based on Gaussian fluctuations in momenta, and quantum fluctuations of the proton into meson-baryon pairs. The model describes the proton structure function and gives a natural explanation of observed quark asymmetries, such as the difference between the anti-up and anti-down sea quark distributions and between the up and down valence distributions. We also find an asymmetry in the mome ...
The I-V characteristic of carbon nanotube (CNT) transistors is dictated by the Schottky barrier (SB) at metal-nanotube interface. The SB is defined by the diameter of the CNT along with the source/drain metal and is presumed a device constant for single CNT transistors. Given the wide distribution of diameter of CVD-grown nanotubes, the presumption of single SB, however, is inappropriate for transistors with aligned array of CNTs. Indeed, array transistors with similar geometries and contact mat ...
We investigate meson electroproduction off complex nuclei in the kinematic regime of the HERMES experiment using a semi-classical transport model which is based on the BoltzmannUehling-Uhlenbeck (BUU) equation. We discuss coherence length and color transparency effects in exclusive ρ0 production as well as hadron formation and attenuation of charged pions, kaons, protons and anti-protons in deep inelastic lepton scattering off nuclei. High energy meson electroproduction off complex nuclei offer ...
– Motivated by recent experiments [1] reporting that carbon nanotubes immersed in a flowing fluid displayed an electric current and voltage, we numerically study the behaviour of a collection of Brownian particles in a channel, in the presence of a flow field applied on similar but slower particles in a wide chamber in contact with the channel. For a suitable range of shear rates, we find that the flow field induces a unidirectional drift in the confined particles, and is stronger for narrower ...
In cosmological models where local cosmic strings are formed at the end of a period of inflation, the perturbations are seeded both by the defects and by the quantum fluctuations. In a subset of these models, for example those based on D-term inflation, the amplitudes are similar. Using our recent calculations of structure formation with cosmic strings, we point out that in a flat cosmology with zero cosmological constant and 5% baryonic component, strings plus inflation fits the observational d ...
An all-metal double metal diaphragm-based optical fiber accelerometer with low transverse sensitivity is proposed and experimentally demonstrated. The theoretical analysis is given based on the electro-mechanical theory. Finite element modal analysis shows that the proposed accelerometer has low transverse sensitivity. Calibration results show that axis responsivity is 41 dB (re: 0 dB = 1 rad/g) with a fluctuation ±2 dB in frequency bandwidth of 5-400 Hz. The transverse sensitivity is ~ 3 ...
The propagation and switching of short pulses in an active two-core fiber nonlinear directional coupler have been investigated theoretically by using the numerical simulation method. The analysis highlight the effects of the second order coupling coefficient dispersion, the linear gain coefficient and the finite gain bandwidth on the propagation and switching of short pulses. We demonstrate that with the influences of the second order coupling coefficient dispersion, the linear gain can sharpen ...
Power-Law detector based on DFT is developed to detect a moving dim target under heavy infrared background. Because that the grey-scale value of a pixel in an image occurs fluctuation when a target passes by, this fluctuation can be viewed as a weak transient signal, and the Power-Law processor has advanced performance on transient signal detection. Firstly, a time window, length of L frames, is introduced in the algorithm. And then, the current frame at the center of the window is processed wit ...
This paper presents a new lung tumor motion prediction method for tumor following radiation therapy. An essential core of the method is accurate estimation of complex fluctuation of time-variant periodical nature of lung tumor motion. Such estimation can be achieved by using a multiple time-variant seasonal autoregressive integral moving average (TVSARIMA) model in which several windows of different lengths is used to calculate correlation based time-variant period of the motion. The proposed me ...
It has long been recognized that the dynamics of linear quantum systems is classical in the Wigner representation. Yet many conceptually important linear problems are typically analyzed using such generally applicable techniques as influence functionals and Bogoliubov transformations. In this Letter we point out that the classical equations of motion provide a simpler and more intuitive formalism for linear quantum systems. We examine the important problem of Brownian motion in the independent o ...
The Internet allows sellers to track “window shoppers,” consumers who look but do not buy, and to lure them back later by targeting them with an advertised sale. This new technology thus facilitates intertemporal price discrimination, but simultaneously makes it too easy for a seller to undercut her regular price. Because buyers know they could be lured back, the seller is forced to set a lower regular price. Advertising costs can, therefore, serve as a form of commitment: a seller can actua ...
The potential of monetary policy to stabilize fluctuations in output and employment is demonstrated in a stochastic rational expectations model in which firms choose, considering average profitability, to set prices in advance of the period when they apply to goods sold. This lead time in pricing decisions increases the fluctuations of output about the normal employment level. But proper use of a feedback monetary policy rule can reduce these fluctuations even though expectations are rational an ...
We consider a quantum system strongly driven by forces that are periodic in time. The theorem concerns the probability P (e) of observing a given energy change e after a number of cycles. If the system is thermostated by a (quantum) thermal bath, e is the total amount of energy transferred to the bath, while for an isolated system e is the increase in energy of the system itself. Then, we show that P (e)/P (−e) = e, a parameter-free, model-independent relation. In the past few years there has ...
This paper gives a review of our recent work on the quantum Frenkel-Kontorova model. Using the squeezed state theory and the quantum Monte Carlo method, we have studied the effects of quantum fluctuations on the Aubry transition and the behavior of the ground state wave function. We found that quantum fluctuations renormalize the sinusoidal standard map to a sawtooth map. Although quantum fluctuations have smeared the Aubry transition, the remnants of this transition are still discernible. The g ...
Abstract Using data retrieved from the INSPEC database we have quantitatively discussed a few syndromes of the publish-or-perish phenomenon, including continuous growth of rate of scientific productivity, and continuously decreasing percentage of those scientists who stay in science for a long time. Making use of the maximum entropy principle and fluctuation-dissipation theorem, we have shown that the observed fat-tailed distributions of the total number of papers x authored by scientists may re ...
A simple diagnostic arrangement is suggested for measuring density and temperature fluctuations. The diagnostic uses a cross-correlation technique to extract local frequency spectra, spatial distribution or (in the case of low mode numbers) the mode structure from the chord-average fluctuating intensities of the visible light in the H-l heliac. For low temperature H-l plasmas (T, x 20 eV, n, z 2 x lo’* crrP3), the spectral line emission from neutral atoms is used. For strong turbulence, where ...
Multipath effect of sea surface has an impact on jamming of active decoy outboard. Firstly, the model of multipath effect of sea surface has been determined. Study of multipath effect is based on the simplest model of mirror reflection, in which it is assumed that mirror target is just below real target and that flat ground surface achieves good electrical conductivity. In the case of mirror reflection, it can be solved by studying the relation with reflection of flat ground surface. Secondly, C ...
Electro-production of pions and kaons at the kinematics of quasi-elastic knockout (which is well known in the physics of atomic nucleus and corresponds to the t-pole diagram) is proposed for obtaining their momentum distribution (MD) in various channels of virtual decay N → B+π, B = N , ∆, N, N, and N → Y +K, Y = Λ, Σ. It is a powerful tool for investigation of a quark microscopic picture of the meson cloud in the nucleon. A model of scalar qq̄ (P0) fluctuation in the non-trivial QCD v ...
We study a U(N) × U(N) symmetric scalar field model in four and three dimensions. First, using our data in four dimensions in the weak coupling region, we demonstrate explicitly that the observed first order phase transition is induced by quantum fluctuations. Next, based on the renormalization group and our new simulation results in three dimensions we argue that even if the UA(1) symmetry is restored below the critical temperature the QCD finite temperature chiral phase transition for two fla ...
Fluctuation Analysis (FA) and specially Detrended Fluctuation Analysis (DFA) are techniques commonly used to quantify correlations and scaling properties of complex time series such as the observable outputs of great variety of dynamical systems, from Economics to Physiology. Often, such correlated time series are analyzed using the magnitude and sign decomposition, i.e., by using FA or DFA to study separately the sign and the magnitude series obtained from the original signal. This approach all ...
Switching activity in digital circuits produce current peaks which result in voltage fluctuation on the power network, and the accompanying digital power noise may cause WIFI desense. To address this issue, this paper proposes a novel simulation method for application to WLCSP (Wafer Level Chip Scale Packaging), in which RDL (Redistribution Layer) routing is only partially occupied by power mesh. The proposed method correctly models the coupling effect from on-die power mesh's current, via mutua ...
We highlight the properties of a simple model (contained in our recent work) of the quantum dynamics of a single point vortex interacting with the nodal fermionic quasiparticles of a d-wave superconductor. We describe the renormalization of the vortex motion by the quasiparticles: at T = 0, the quasiparticles renormalize the vortex mass and introduce only a weak sub-Ohmic damping. Ohmic (or ‘BardeenStephen’ damping) appears at T > 0, with the damping co-efficient vanishing ∼ T 2 with a ...
The nuclear magnetic relaxation in scandium metal is investigated at liquid helium temeprature for both single crystal and powder samples. The obtained temperature and field dependence of the Korringa constant are described by the means of the spin fluctuation theory. It is shown that one of the reason for the high field decreasing of the relaxation rate is the quenching of spin fluctuations. The other possible reason is the magnetic impurity influence. The reasons of the existing variations of ...
The method of processing of radar echo signals on the basis of an algorithm of additional autocorrelated estimation of the echo-mixture complex envelope that allows realizing the available fluctuation amplitude and angular modulation in radar signals even without their preliminary assessment is offered. ...
This thesis deals with the dynamics of tundra living voles with emphasis on the most common one, the greysided vole (Clethrionomys rufocanus). The tundra area chosen for the study was Finnmarksvidda, a vast flatland in northernmost Norway. All small mammal herbivores in the area showed dramatic fluctuations, and field experiment were conducted in order to elucidate these density fluctuations. The specific subjects addressed included: 1/ Temporal and spatial appearance of density fluctuations of ...
In the framework of the Lindblad theory for open quantum systems we determine the degree of quantum decoherence and classical correlations of a harmonic oscillator interacting with a thermal bath. The transition from quantum to classical behaviour of the considered system is analyzed and it is shown that the classicality takes place during a finite interval of time. We calculate also the decoherence time and show that it has the same scale as the time after which statistical fluctuations become ...
Time-gated single photon counting (TGSPC), which employs a single photon detector as the detection apparatus (Poultney, 1972; 1977), has received increasing attention because of its superior spatial resolution and the absence of the so-called classical dead zones (Forrester & Hulme, 1981). TGSPC is a repetitively pulsed statistical sampling technique that records the time of arrival of photons and logs this against the time of emission of a laser pulse. TGSPC have become increasingly important i ...
The vibrational-rotational absorption of /sup 13/C/sub 2/H/sub 2/ molecules (VRAMs) in the 1.52-1.55 mu m region was investigated in detail. On the basis of this investigation, frequency stabilization of 1.55- mu m distributed-feedback (DFB) laser diodes was demonstrated. Frequency stability to within 2 MHz peak/peak fluctuation was achieved at the 1.54949- mu m wavelength. In addition, frequency stabilizations in the wavelength regions of 1.53 mu m and 1.54 mu m were also carried out by using t ...
Bernardeau et al. (1997), using perturbation theory, showed that the skewness of the large-scale lensing-convergence, or projected mass density, could be used to constrain Ωm, the matter content of the universe. On the other hand, deep weak-lensing field surveys in the near future will likely measure the convergence on small angular scales ( ∼ 10 arcmin.), where the signal will be dominated by highly nonlinear fluctuations. We develop a method to compute the smallscale convergence skewness, m ...
This work is a contribution to the study of universality in out-of-equilibrium lattice models undergoing a second-order phase transition at equilibrium. The experimental protocol that we have chosen is the following: the system is prepared in its high-temperature phase and then quenched at the critical temperature Tc. We investigated by mean of Monte Carlo simulations two quantities that are believed to take universal values: the exponent λ/z obtained from the decay of autocorrelation functions ...
Threshold voltage dispersion due to random discrete dopant fluctuation was simulated in recessed-channel, triple-gate, and saddle MOS structures, targeting future floating-gate memory cell transistor. All nonplanar structures showed improved dispersion characteristics, compared with the planar type by proper adjustment of the tunnel oxide structure and channel doping level. The recessed-channel showed a continuous improvement of dispersion with the channel area widening beyond a certain threshol ...
We analyze recent results of atomistic computer simulations of grain boundary (GB) diffusion in metals. At temperatures well below the bulk melting point Tm GB diffusion occurs by random walk of individual vacancies and self-interstitials. Both defects are equal participants in the diffusion process and can move by a large variety of diffusion mechanisms, many of which are collective transitions. GB diffusion coefficients can be computed by kinetic Monte Carlo simulations. At high temperatures, ...
An analysis of the spatial fluctuations in 15 deep ASCA SIS0 images has been conducted in order to probe the 2-10 keV X-ray source counts down to a flux limit ∼ 2× 10erg cm s. Special care has been taken in modelling the fluctuations in terms of the sensitivity maps of every one of the 16 regions (5.6× 5.6 arcmin each) in which the SIS0 has been divided, by means of raytracing simulations with improved optical constants in the X-ray telescope. The very extended ‘side lobes’ (extending up ...
– Mesoscopic aging systems are characterized by large intermittent noise fluctuations. In a record dynamics scenario [P. Sibani and J. Dall, Europhys. Lett. 64, 2003] these events, quakes, are treated as a Poisson process with average α ln(1 + t/tw), where t is the observation time, tw is the age and α is a parameter. Assuming for simplicity that quakes constitute the only source of de-correlation, we present a model for the probability density function (PDF) of the configuration autocorrela ...
We consider QoS provision and routing schemes for connections with end-to-end delay requirements in networks which employ rate-based schedulers. First, we consider the case of burstiness-constrained (BC) traffic with deterministic QoS requirements. Here, we extend the results of a previous study in order to obtain routing schemes of low computational complexity that identify feasible paths while optimizing some network utilization criteria. Next, we consider traffic with exponentially bounded bu ...
We report resistivity and magnetization of single crystal MgB2, focusing on the broadening of superconducting (SC) transition in magnetic fields. In-plane and outof-plane resistivity indicate that the broadening of superconducting transition is independent of Lorentz force and that it is merely dependent on the magnetic field direction. In magnetization, diamagnetic signal begins to appear at almost the same temperature as the onset temperature of resistivity transition. These results suggest th ...
Electric vehicle (EV) offers one of the most promising approaches towards reducing urban pollution. With EVs' integration into power grid for charging batteries, they can potentially have a significant impact on the distribution grid. This paper discusses the modeling of a charging station for analysis of charging load demand in a residential parking lot with the assumption that EV arrivals follow Poisson distribution. Then, a simulation framework to generate the charging load profiles is propos ...
Based on wavelet analysis, by measuring burstiness of network traffic and analyzing its statistical properties, we provide an empirical evidence for connections between self-organized criticality and network traffic, that is, avalanche, duration time and inter-event time of traffic flow fluctuation obey power law, which indicates that self-organized criticality maybe is the origin of fluctuation burstiness. The fact that inter-event time obeys power law confirms further that network traffic exhi ...
We estimate the number of CdSe quantum dots QDs in a microenvironment by analyzing the intensity fluctuation of the fluorescence time trace from a collection of QDs in the fluorescence intensity steady-state regime. The steady state is chosen because the aged blinking dynamics of single QDs leads to a higher probability for observing large on and off waiting times relative to the typical time bins chosen to generate fluorescence time traces. In the steady state, the relative standard deviation o ...
The primary interest in inflation [1,2] is as a mechanism to explain the origin of structure in the Universe from vacuum fluctuations in an early inflationary era which are swept up to arbitrarily large scales. The simplest inflationary models predict an almost scaleinvariant spectrum of Gaussian, adiabatic density perturbations. Such a spectrum was already known as a likely model of structure formation long before inflation was proposed. Inflation also predicts a spectrum of gravitational waves ...