8,057 research outputs found
Searches for New Physics at the Tevatron
This paper summarizes searches at the Fermilab Tevatron for a wide variety of
signatures for physics beyond the Standard Model. These include searches for
supersymmetric particles, in the two collider detectors and in one fixed target
experiment. Also covered are searches for leptoquarks, dijet resonances, heavy
gauge bosons, and particles from a fourth generation, as well as searches for
deviations from the Standard Model predictions in dijet angular distributions,
dilepton mass distributions, and trilinear gauge boson couplings.Comment: 16 pages, 12 figures, Latex. Talk given at the Meeting of the
Division of Particles and Fields (DPF96), Minneapolis, August 10-15, 1996 (to
be published in the proceedings
An Investigation of What Factors Determine the Way in Which Customer Satisfaction Is Increased through Omni-Channel Marketing in Retail
There have been significant changes evident across the retail sector over the last 20 years, which have been primarily influenced by technological advancements. These changes have forced many retailers to rethink their business models and utilise a combination of both brick and mortar stores and online domains to present an integrated shopping experience. In order to gain an understanding of how customer satisfaction is increased through omni-channel retailing, we collected data through survey research, specifically through semi-structured interviews and questionnaires. In order to generate concise and accurate findings, the data were analysed using thematic analysis. From this analysis, three themes were generated. The first theme explores the reasoning behind preferred shopping methods and what influences these customers’ purchase methods. The second theme explores customers’ personal preference and investigates the potential of using virtual reality as a method for increasing customer satisfaction. Finally, the third theme looks into utilising interactive technology to create a diversified user experience. This theme explores the potential of utilising a communication platform for customers and also designing a tangible interface for disabled customers. This study has opened up an opportunity for future research and has outlined potential design insights in how to improve customer experience and customer purchase intentions
Interaction of Recoiling Supermassive Black Holes with Stars in Galactic Nuclei
Supermassive black hole binaries (SMBHBs) are the products of frequent galaxy
mergers. The coalescence of the SMBHBs is a distinct source of gravitational
wave (GW) radiation. The detections of the strong GW radiation and their
possible electromagnetic counterparts are essential. Numerical relativity
suggests that the post-merger supermassive black hole (SMBH) gets a kick
velocity up to 4000 km/s due to the anisotropic GW radiations. Here we
investigate the dynamical co-evolution and interaction of the recoiling SMBHs
and their galactic stellar environments with one million direct N-body
simulations including the stellar tidal disruption by the recoiling SMBHs. Our
results show that the accretion of disrupted stars does not significantly
affect the SMBH dynamical evolution. We investigate the stellar tidal
disruption rates as a function of the dynamical evolution of oscillating SMBHs
in the galactic nuclei. Our simulations show that most of stellar tidal
disruptions are contributed by the unbound stars and occur when the oscillating
SMBHs pass through the galactic center. The averaged disruption rate is
~10^{-6} M_\odot yr^{-1}, which is about an order of magnitude lower than that
by a stationary SMBH at similar galactic nuclei. Our results also show that a
bound star cluster is around the oscillating SMBH of about ~ 0.7% the black
hole mass. In addition, we discover a massive cloud of unbound stars following
the oscillating SMBH. We also investigate the dependence of the results on the
SMBH masses and density slopes of the galactic nuclei.Comment: 38 pages, 10 figues; accepted for publication in Ap
Performance of the Colorado wind-profiling network, part 1.5A
The Wave Propagation Laboratory (WPL) has operated a network of radar wind Profilers in Colorado for about 1 year. The network consists of four VHF (50-MHz) radars and a UHF (915-MHz) radar. The Platteville VHF radar was developed by the Aeronomy Laboratory (AL) and has been operated jointly by WPL and AL for several years. The other radars were installed between February and May 1983. Experiences with these radars and some general aspects of tropospheric wind measurements with Doppler radar are discussed
Preliminary test results of the joint FAA-USAF-NASA runway research program. Part 1: Traction measurements of several runways under wet and dry conditions with a Boeing 727, a diagonal-braked vehicle, and a mu-meter
The stopping distance, brake application velocity, and time of brake application were measured for two modern jet transports, along with the NASA diagonal-braked vehicle and the British Mu-Meter on several runways, which when wetted, cover the range of slipperiness likely to be encountered in the United States. Tests were designed to determine if correlation between the aircraft and friction measuring vehicles exists. The test procedure, data reduction techniques, and preliminary test results obtained with the Boeing 727, the Douglas DC-9, and the ground vehicles are given. Time histories of the aircraft test run parameters are included
Studies of Tiros and Nimbus radiometric observations Final report
Data analyses of Tiros and Nimbus radiometric observation
Meteorological interpretation of Nimbus High Resolution Infrared /HRIR/ data
Nimbus satellite high resolution infrared photographic data analysi
Changes in Hemoglobin Concentration After Two Weeks of Apnea Training
Hemoglobin concentration has been shown to increase immediately after maximal-duration apneas in both divers and untrained individuals. Relatively few studies have examined how apnea training programs influence hemoglobin concentration in untrained individuals. PURPOSE: To examine how a two-week maximal duration breath-hold training program, consisting of five maximal duration voluntary apneas per day, would change hemoglobin concentration in healthy adults. This study looked at short-term changes in hemoglobin after a series of breath-holds when untrained and trained in addition to long-term changes in resting hemoglobin before and after training. METHODS: Fifteen healthy adults (22.4 ± 4.8 years) came to the lab and had their hemoglobin concentration measured, performed a breath-hold training session of five maximal duration breath-holds, followed by another hemoglobin concentration measurement. They performed the same training session at home for two weeks before returning to the lab for visit two, now considered trained, where the same protocol as visit one was repeated. RESULTS: Females (before and after training) and untrained males did not exhibit a short-term increase in hemoglobin but trained males had a statistically insignificant short-term increase in hemoglobin (p = 0.142) after a series of breath-holds. Resting hemoglobin concentration was not significantly different after training for females (p = 1.000) or males (p = 0.071). CONCLUSION: Although previous studies have shown short-term increases in hemoglobin when untrained and trained, this study opposes research by only replicating a short-term increase, to a statistically insignificant degree, for trained males. The lack of increased resting hemoglobin after two weeks of breath-hold training supports findings from the limited existing literature on the subject
Gravitational waves from galaxy encounters
We discuss the emission of gravitational radiation produced in encounters of
dark matter galactic halos. To this aim we perform a number of numerical
simulations of typical galaxy mergers, computing the associated gravitational
radiation waveforms as well as the energy released in the processes. Our
simulations yield dimensionless gravitational wave amplitudes of the order of
and gravitational wave frequencies of the order of Hz,
when the galaxies are located at a distance of 10 Mpc. These values are of the
same order as those arising in the gravitational radiation originated by strong
variations of the gravitational field in the early Universe, and therefore,
such gravitational waves cannot be directly observed by ground-based detectors.
We discuss the feasibility of an indirect detection by means of the B-mode
polarization of the Cosmic Microwave Background (CMB) induced by such waves.
Our results show that the gravitational waves from encounters of dark matter
galactic halos leave much too small an imprint on the CMB polarization to be
actually observed with ongoing and future missions.Comment: 9 pages with revtex style, 3 ps figures; to be published in Physical
Review
Phase Space Transport in Noisy Hamiltonian Systems
This paper analyses the effect of low amplitude friction and noise in
accelerating phase space transport in time-independent Hamiltonian systems that
exhibit global stochasticity. Numerical experiments reveal that even very weak
non-Hamiltonian perturbations can dramatically increase the rate at which an
ensemble of orbits penetrates obstructions like cantori or Arnold webs, thus
accelerating the approach towards an invariant measure, i.e., a
near-microcanonical population of the accessible phase space region. An
investigation of first passage times through cantori leads to three
conclusions, namely: (i) that, at least for white noise, the detailed form of
the perturbation is unimportant, (ii) that the presence or absence of friction
is largely irrelevant, and (iii) that, overall, the amplitude of the response
to weak noise scales logarithmically in the amplitude of the noise.Comment: 13 pages, 3 Postscript figures, latex, no macors. Annals of the New
York Academy of Sciences, in pres
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