Miracle-dz/UniFAR-FTUs huggingface dataset:
Nonlinear forces on a horizontal cylinder beneath waves

Measurements of forces experienced by a submerged horizontal cylinder with its axis parallel to the crests in deep-water waves reveal nonlinear components with frequencies up to three times the fundamental wave frequency. The dominant nonlinear contribution to the loading is at the third order in the wave amplitude, and, for Keulegan-Carpenter numbers approaching 2, its magnitude was found to be as much as one-half that of the inertia force. It is suggested that the third-order force is associated with circulation generated by steady streaming in the oscillatory boundary layer on the cylinder. At higher Keulegan-Carpenter numbers, form drag becomes increasingly important, and velocity measurements close to the cylinder show the rapid development of the wake. Observations of nonlinear features of the transmitted waves are also discussed.
The host galaxy/AGN connection in nearby early-type galaxies. Sample selection and hosts brightness profiles

This is the first of a series of three papers exploring the connection between the multiwavelength properties of AGNs in nearby early-type galaxies and the characteristics of their hosts. We selected two samples, both with high resolution 5 GHz VLA observations available and providing measurements down to 1 mJy level, reaching radio-luminosities as low as 10 19 W Hz -1 . We focus on the 116 radio-detected galaxies as to boost the fraction of AGN with respect to a purely optically selected sample. Here we present the analysis of the optical brightness profiles based on archival HST images, available for 65 objects. We separate early-type galaxies on the basis of the slope of their nuclear brightness profiles, into core and power-law galaxies following the Nuker's scheme, rather than on the traditional morphological classification (i.e. into E and SO galaxies). Our sample of AGN candidates is indistinguishable, when their brightness profiles are concerned, from galaxies of similar optical luminosity but hosting weaker (or no) radio-sources. We confirm previous findings that relatively bright radio-sources (L, > 10 21.5 W Hz -1 ) are uniquely associated to core galaxies. However, below this threshold in radio-luminosity core and power-law galaxies coexist and they do not show any apparent difference in their radio-properties. Not surprisingly, since our sample is deliberately biased to favour the inclusion of active galaxies, we found a higher fraction of optically nucleated galaxies. Addressing the multiwavelength properties of these nuclei will be the aim of the two forthcoming papers.
CGAcc : CSR-based Graph Traversal Accelerator on HMC

Graph traversal is widely involved in lots of realistic scenarios such as road routing, social network and so on. Unfortunately graph traversal is quite time-consuming because of terrible spatial locality. Conventional prefetch technology and parallel framework do not bring much benefit. Hybrid Memory Cube (HMC) can serve as high bandwidth main memory as well as providing an enhanced logic layer with the ability of controlling memory access and processing in memory (PIM). Armed with the knowledge of graph’s structure, we propose CGAcc in this paper. By deploying three prefetchers on the logic layer and making them in a pipeline way, CGAcc achieves average 2.8X speedup compared with conventional memory system with stream prefetcher. CCS CONCEPTS • Hardware→ Memory and dense storage;
A new way of finding locations of zeros of wave functions

A new analytic method is presented for evaluating zeros of wave functions. In this method, locating the zeros of wave functions of the Schrodinger equation is converted to finding the roots of a polynomials. The coefficient of this polynomial can be evaluated analytically for a class of potentials. The speciality of this method is that the zeros are located without solving an equation of motion for the wave function. The method is valid for both real and complex systems and can be applied for locating both real and complex zeros. Examples are given to illustrate the method. PACS Nos.: 02.30. Mv, 03.65. Ge, 03.65. Sq, 03.65. w, 04.20. Jb, 04.20. Ha, 05.45. Mt
Numerical Analysis of Flow Distributors to Improve Temperature Stratification in Storage Tanks

Different flow distributors have been studied to improve the temperature stratification in cylindrical enclosures. Numerical investigations have been carried out to describe the velocity and temperature fields inside a storage tank with different flow distributors in the case of upper inflow configuration. The aim of the study was to evaluate the effect of the flow distributors to increase the temperature stratification. Finite-volume formulation was applied to solve the governing transport equations. The developed code was validated by measurements carried out for a simple flat-plate diffuser. The numerical calculation predicts with reasonable accuracy the experimental results in the case of the plate diffuser. Different geometric parameters of the flow distributor were examined from a temperature stratification point of view.
Estimation Using Quantized Innovations for Wireless Sensor Networks

Recent advancements in integrated small scale micro-electromechanical system technology has created cheap, low power-consuming sensors that can be used in wireless sensor networks, an increasingly popular technology because of its potentially diverse applications. However, sensor networks have many constraints, such as limited bandwidth and power, which have inspired a considerable amount of research for the development of energy efficient detection and estimation algorithms using quantized observations. Though optimal estimation algorithms using quantized innovations have been recently developed to tackle this problem, bounds are not available on the error of the resulting optimal filter. Because tight bounds on the estimation error are essential in determining the stabilizability of the corresponding closed loop dynamical system and thus the applicability of a filter to a specific system, this project focuses on developing error bounds from a close study of the filtering algorithms. Initial attempts were unable to show that the estimation error of a system using quantized innovations followed a Ricatti recursion. Thus, a number of different algorithms and coder-estimator pairs were then analyzed to determine performance and to better understand means of proving stabilizability. Our primary goal is to have a better understanding of the evolution of the lower and upper bounds of estimation errors under measurement quantization, so that filters with verifiable performance specifications can be systematically designed for particular dynamical systems.
Underwater 3-D optical imaging with a gated viewing laser radar

New 3-D optical underwater images are presented. The 3-D images are recorded in fresh water and brackish sea water salinity 15‰, at 4- to 5-m range. For the first time, underwater 3-D images are computed by our new algorithm, which applies the method of weighted averages on a sequence of 2-D images. It is proposed that 3-D gated viewing images can be recorded at any contrast level between 0 and 100%. A novel and dynamic way of measuring the depth of gating is presented. A novel correction for gated viewing 3-D imaging is pre- sented. For the first time, an exact solution of the depth of gating is proposed for a rectangular laser pulse. © 2005 Society of Photo-Optical Instru-
Sign-weighted peak minimization problem for continuous-time systems

We study the problem of minimizing a parametrized convex combination of the overshoot and undershoot of SISO continuous time system in response to a known input. From a dual formulation we develop a condition for solution existence and specify the structure of optimal solution. In addition, an interrelation between the overshoot and undershoot in controller synthesis is analytically explained in our framework.
Fluctuating forces on a rigid circular cylinder in confined flow

The fluctuating lift and drag acting on a long, rigidly supported circular cylinder placed symmetrically in a narrow rectangular duct were investigated for various blockage percentages over a wide range of Reynolds numbers around the critical value. The data obtained permit a full assessment of the effect of confinement on the mean-drag coefficient, the root-mean-square values of both the drag and the lift fluctuations, the Strouhal number of the dominant vortex shedding, and the Reynolds number marking transition from laminar to turbulent flow separation. Besides experimental information on a subject on which little is known so far, the paper provides a basis for the deduction of better correction procedures concerning the effects of blockage.
On a class of extremal problems in statistics

Let m denote the infimum of the Integral of a function q w r t all probability measures with given marginals. The determination of m is of interest for a series of stochastic problems. In the present paper we prove a duality theorem for the determination of m and give some examples for its application. We consider especially the problem of extremal variance of sums of random variables and prove a theorem for the existence of random variables with given marginal distributions, such that their sum has variance zero.
The peculiar radio galaxy 3C 433

Radio, optical, and x-ray observations are presented of the peculiar radio galaxy 3C 433. Two basic features characterize the radio morphology: namely, a striking asymmetry in the strength and shape of the radio emission and an overall x-shaped structure. The source is peculiar in that it has a rather high radio luminosity for such a complex morphology. The identification of the source with a pair of bright galaxies is confirmed. The origin of the x shape is therefore discussed in the context of recently proposed torquing (Wirth et al. 1982) and precessing (Gower et al. 1982) models which are based upon tidal interaction of double galaxies. Both models can adequately explain this overall structure but fail to account for the large brightness asymmetry. Additional assumptions are required. It seems the least contrived to assume that, after an impulsive encounter with the parent galaxy, the directions of the (twin) jets are suddenly switched so that they now propagate through environments which are disturbed in the encounter, more so to the south of the parent galaxy. The x-ray detection of 3C 433 is used to set limits on the environmental factors affecting the radio source structure.
The distance to the Large Magellanic Cloud - Constraints from Cepheids in Large Magellanic Cloud star clusters

We have used recent observational data for the Cepheids in the rich, young LMC clusters NGC 1866 and NGC 2031 to constrain the cluster distances with the mass-equivalency (ME) method. The basis of this approach is to fix the cluster distances by requiring the Cepheid evolutionary and pulsational masses to be equal. Using evolutionary models incorporating a mild amount of core and envelope overshooting along with recent pulsational models, we derive distance moduli of 18.51 +/- 0.21 and 18.32 +/- 0.20 for NGC 1866 and NGC 2031, respectively. The quoted errors are dominated by the uncertainties in the heavy element abundances of the clusters (assumed to be 0.3 dex for both clusters), with a smaller contribution due to the apparently intrinsic spread in the masses of the Cepheids in each cluster. For the ME method, we find that Delta(m-M)(0)/Delta sub Z(1) = 0.69, where Z(1) = log (Z/0.016). This result implies that the cluster distances can be determined to better than +/- 5 percent if the cluster abundances can be measured to better than about +/- 0.15 dex.
Aerodynamic interactions with turbulent jet exhaust plumes

The importance of aerodynamic interactions associated with external flow-field effects on turbulent jet exhaust plume structure is discussed. A viscous/inviscid prediction technique is presented which combines the overlaid mixing and inviscid plume components of the JANNAF Standardized Plume Flow-Field (SPF) model with inviscid external flow and boundary-layer analyses for treating nozzle afterbodies at subsonic/transonic speeds. Validation of the technique via comparisons between predictions and experiment for cold-air jet plumes is presented. Predicted spatial temperature distributions for hot, nonafterburning plumes are presented and compared to results obtained from more simplified prediction techniques in order to assess the importance of the aerodynamic interactions associated with external boundary layers and pressure gradients. It is demonstrated that these interactions play a significant role in determining the near-field turbulent mixing and inviscid plume shock structure. The implication of these results to plume radiation predictions is discussed.
Mid-infrared Continuum of Starburst Nuclei: Contribution from Hot Large Grains within H II Regions?

The IRAS 12 and 25 μm fluxes are compared with the Brγ flux in a sample of starburst nuclei. Good correlations are found between them. The subsequent analysis indicates the presence of two components in the mid-infrared continuum: the nonthermal emission from “small grains” (≤100 Å) which are heated transiently by nonionizing photons outside the H II regions and the thermal emission from “large grains” which are heated to ~140 K by ionizing, nonionizing, and Lyα photons inside the H II regions. The small grains emitting at 12 μm are depleted by ~20% with respect to cirrus clouds in our Galaxy. The ratio of amounts of large grains to gas in the H II regions is comparable to the standard interstellar value. The emission from hot large grains appears to be more enhanced over the emission from small grains in starburst nuclei with higher excitations.
Computer studies on development of the fast reconnection mechanism for different resistivity models

Computer simulations systematically study how the fast reconnection mechanism involving standing switch‐off shocks can be established and sustained in a large‐scale current sheet system. Initiated by a small disturbance, all the phenomena spontaneously grow from near the origin and propagate outward. Under the same initial boundary conditions, different resistivity models are assumed, where the resistivity is self‐consistently determined by macroscopic quantities in the system. It is found that the reconnection process is strongly controlled by the resistivity model. Only when the resistivity is locally enhanced near an X‐type neutral point in accordance with the global reconnection flow, the fast reconnection mechanism can rapidly build up and be sustained steadily. The steady fast reconnection mechanism works as an engine that drastically drives the overall system into catastrophe. Since this mechanism depends on the resistivity parameter very weakly, it may be applicable to large dissipative events in space plasmas. It is argued that local conditions near an X neutral point should be fundamental for the fast reconnection mechanism to be realized.
Multichannel blind deconvolution of colored signals via eigenvalue decomposition

We prove that a MIMO (multiple input multiple output) blind deconvolution problem for n colored uncorrelated signals can be converted to n SIMO (single input multiple output) problems, using eigenvalue decomposition of a special covariance matrix, depending on L-dimensional parameter b, if appropriate covariance matrices have sets of eigenvalues with empty pairwise intersection. We present a sufficient condition for this conversion and discuss how to End such parameters. We prove that the parameters b for which this is possible, form an open subset of IR/sup L/, whose complement has a Lebesgue measure zero.
Low-frequency noise in AlGaN'GaN heterojunction field effect transistors on SiC and sapphire substrates

Low frequency noise has been investigated in gallium nitride/gallium–aluminum nitride GaN/GaAlN field effect transistors grown on sapphire and silicon carbide (SiC) substrates under identical conditions. GaN/AlGaN heterostructures grown on SiC substrate have a lower level of 1/f noise and a higher electron mobility compared to samples grown on sapphire. The noise of the gate leakage current Ig can give the main contribution to the output noise of the drain current Id even at Ig/Id ratios as small as 10−4–10−5. For the structures grown on SiC, a very weak temperature dependence of the low frequency noise was found in the temperature range 300 320 K. The effect of band-to-band illumination on the low-frequency noise is similar to that for silicon and gallium arsenide (GaAs) based transistors. The Hooge parameter α for the wafers grown on.
Generalisations of the MHV lagrangian theory to D-dimensions and to super-space

It has been known that the CSW rules correctly reproduce all tree-level scattering amplitudes for perturbative non-abelian gauge theory but fail to explain some of the loop order results. In this thesis we generalise the lagrangian derivation of the rules and account for the missing amplitudes in dimensional regularisation scheme. We analyse generically when the equivalence between MHV rules lagrangian and Yang-Mills lagrangian theory is violated and hence the CSW rules do not apply. We find a type of generalised measure-preserving transformations which when applied to the Yang-Mills lagrangian also produce vertices that have same the helicity structure as the CSW rules. Among these transformations we find in 4-dimensions the canonical transformation generates the MHV vertices that are described by the Parke-Taylor formula. Finally we generalise the canonical transformation on supersymmetric theories. In light-cone gauge the physical components of the N=1 SYM lagrangian are closed under a subgroup of the SUSY transformations. We find the N=1 super Yang-Mills lagrangian can be rewritten in terms of chiral and anti-chiral superfields. In both N=1 and N=4 theories we perform a fermionic integral transformation on superfields analogous to Fourier transform which takes functions from coordinate space into momentum space. The on-shell SUSY generators we derive from the integral transformation agree with the prescription commonly used in the supersymmetry BCFW recursion formula. We apply the canonical transformation on both supersymmetric theories and compute the generic n-point MHV super-vertex. The N=4 MHV super-vertices are shown to agree with Nair's formula which was originally derived from WZW model.
Analysis of the localization of Michelson interferometer fringes using Fourier optics and temporal coherence

Fringes formed in a Michelson interferometer never localize in any plane, in the detector plane and in the localization plane. Instead, the fringes are assumed to localize at infinity. Except for some explanation in Principles of Optics by Born and Wolf (1964 (New York: Macmillan)), the fringe localization phenomena of Michelson's interferometer have never been analysed seriously in any book. Because Michelson's interferometer is one of the important and fundamental optical experiments taught at both undergraduate and graduate levels, it would be appropriate to explain the localization of these fringes. In this paper, we analyse the localization of Michelson interferometer fringes using Fourier optics and temporal coherence, and show that they never localize at any plane even at infinity.
Assessing Customer Satisfaction of Urban Rail Transit Network in Tianjin Based on Intuitionistic Fuzzy Group Decision Model

Urban rail transit has played an important role in big and crowded cities. Providing services with high levels of customer satisfaction is essential in order to increase the sharing rate of urban rail transit and to reduce traffic congestion by shifting people away from private car use. Therefore, it is of great significance to improve the customer satisfaction of urban rail transit. This paper presents an intuitionistic fuzzy group decision model to evaluate the customer satisfaction of urban rail transit. An evaluation indicator system including seven categories of indicators is established to measure passengers’ satisfaction. The overall customer satisfaction level of the urban rail transit lines is obtained by the intuitionistic fuzzy entropy and intuitionistic fuzzy weighted average (IFWA) operator. The intuitionistic fuzzy entropy is used to solve attribute weights and IFWA operator is used to solve the information aggregation. Drawing on Tianjin urban rail transit lines as a case study, the detailed analyses were conducted to evaluate the overall customer satisfaction level of five urban rail transit lines and as such suggesting remedy strategies. The results can help urban rail transit operation company to improve the service quality of urban rail transit.
One picture says it all—high-pressure cells for neutron Laue diffraction on VIVALDI

Possible applications of the neutron single-crystal Laue diffraction technique with a large image-plate detector to high-pressure studies are examined. One opposed-piston cell with a Ti–Zr casing is shown to be acceptable for medium pressures. For higher pressures a moissanite-anvil cell with reasonably large accessibility is shown to offer impressive gains in data collection rate as compared to the monochromatic technique. Moreover, the projected forms of the reflections from the sample and anvils facilitate alignment, and the wide wavelength band of the Laue technique allows recovery of reflections masked by the cell pillars, simply by rotation of the cell.
Nonparametric estimation of a maximum of quantiles

A simulation model of a complex system is considered, for which the outcome is described by m(p,X), where p is a parameter of the system, X is a random input of the system and m is a real-valued function. The maximum (with respect to p) of the quantiles of m(p,X) is estimated. The quantiles of m(p,X) of a given level are estimated for various values of p by an order statistic of values m(pi, Xi) where X,X1, X2, . are independent and identically distributed and where pi is close to p, and the maximal quantile is estimated by the maximum of these quantile estimates. Under assumptions on the smoothness of the function describing the dependency of the values of the quantiles on the parameter p the rate of convergence of this estimate is analyzed. The finite sample size behavior of the estimate is illustrated by simulated data and by applying it in a simulation model of a real mechanical system. AMS classification: Primary 62G05; secondary 62G30.
Direct adaptive fuzzy control for a class of discrete-time systems

A direct adaptive control scheme is presented for a class of discrete-time nonlinear systems. The control scheme is based on an online functional approximation approach which modifies a standard or Takai-Sugeno (1985) fuzzy control system. A modified version of the standard key technical lemma which allows for adaptive systems with dead zones is used to guarantee asymptotic convergence of the tracking error to an /spl epsiv/-neighborhood of zero.
Shape of hexagonal hydrostatic menisci

A numerical method is implemented for computing the shape of an infinite, hexagonal, doubly periodic, hydrostatic meniscus originating from contact lines whose projections in the horizontal plane are circles. The contact lines themselves may lie on vertical cylinders or spherical objects. The Laplace–Young equation determining the meniscus shape is solved by a finite‐difference method in orthogonal curvilinear coordinates generated by conformal mapping. The elevation of the contact lines is either prescribed or computed as part of the solution to ensure a specified contact angle. The results illustrate that the contact line spacing has an important effect on the contact angle or contact line distribution. Meniscus shapes exist only for a limited range of pressure differences between the upper and lower fluid that depend on the capillary length. Copyright © 2009 John Wiley & Sons, Ltd.