4,154 research outputs found
Compensation for nonlinear effects due to high heat flux in thin-film thermometry
Compensation for nonlinear effects due to high heat flux in thin-film thermometr
A Method for Determining Optimum Re-entry Trajectories
Determining optimum atmospheric reentry trajectories using Pontryagin maximum principl
Dynamical instabilities of Bose-Einstein condensates at the band-edge in one-dimensional optical lattices
We report on experiments that demonstrate dynamical instability in a
Bose-Einstein condensate at the band-edge of a one-dimensional optical lattice.
The instability manifests as rapid depletion of the condensate and conversion
to a thermal cloud. We consider the collisional processes that can occur in
such a system, and perform numerical modeling of the experiments using both a
mean-field and beyond mean-field approach. We compare our numerical results to
the experimental data, and find that the Gross-Pitaevskii equation is not able
to describe this experiment. Our beyond mean-field approach, known as the
truncated Wigner method, allows us to make quantitative predictions for the
processes of parametric growth and thermalization that are observed in the
laboratory, and we find good agreement with the experimental results.Comment: v2: Added several reference
Current State of Commercial Wearable Technology in Physical Activity Monitoring 2015-2017
International Journal of Exercise Science 11(7): 503-515, 2018. Wearable physical activity trackers are a popular and useful method to collect biometric information at rest and during exercise. The purpose of this systematic review was to summarize recent findings of wearable devices for biometric information related to steps, heart rate, and caloric expenditure for several devices that hold a large portion of the market share. Searches were conducted in both PubMed and SPORTdiscus. Filters included: humans, within the last 5 years, English, full-text, and adult 19+ years. Manuscripts were retained if they included an exercise component of 5-min or greater and had 20 or more participants. A total of 10 articles were retained for this review. Overall, wearable devices tend to underestimate energy expenditure compared to criterion laboratory measures, however at higher intensities of activity energy expenditure is underestimated. All wrist and forearm devices had a tendency to underestimate heart rate, and this error was generally greater at higher exercise intensities and those that included greater arm movement. Heart rate measurement was also typically better at rest and while exercising on a cycle ergometer compared to exercise on a treadmill or elliptical machine. Step count was underestimated at slower walking speeds and in free-living conditions, but improved accuracy at faster speeds. The majority of the studies reviewed in the present manuscript employed different methods to assess validity and reliability of wearable technology, making it difficult to compare devices. Standardized protocols would provide guidance for researchers to evaluate research-grade devices as well as commercial devices used by the lay public
The exclusive B to K*(to K pi) l+ l- decay: CP conserving observables
We study the K* polarization states in the exclusive 4-body B meson decay B
to K* (to K pi) l+ l- in the low dilepton mass region working in the framework
of QCDF. We review the construction of the CP conserving transverse and
transverse/longitudinal observables AT2, AT3, and AT4. We focus here, on
analyzing their behaviour at large recoil energy in presence of right-handed
currents.Comment: 7 pages, 3 figures, invited talk at Flavianet Meeting, Kazimierz,
Poland, July, 200
New observables in the decay mode anti-B --> anti-K*0 l+ l-
We discuss the large set of observables available from the angular
distributions of the decay anti-B --> anti-K*0 l+ l-. We present a NLO analysis
of all observables based on the QCD factorization approach in the low-dilepton
mass region and an estimate of \Lambda/m_b corrections. Moreover, we discuss
their sensitivity to new physics. We explore the experimental sensitivities at
LHCb (10 fb^-1) and Super-LHCb (100 fb^-1) based on a full-angular fit method
and explore the sensitivity to right handed currents. We also show that the
previously discussed transversity amplitude A_T^(1) cannot be measured at the
LHCb experiment or at future B factory experiments as it requires a measurement
of the spin of the final state particles.Comment: 30 pages, 14 figures. Changes: Typos in (4.3) and (4.11) corrected,
analysis, results and figures unchange
Biosensor-controlled gene therapy/drug delivery with nanoparticles for nanomedicine
Nanomedicine involves cell-by-cell regenerative medicine, either repairing cells one at a time or triggering apoptotic pathways in cells that are not repairable. Multilayered nanoparticle systems are being constructed for the targeted delivery of gene therapy to single cells. Cleavable shells containing targeting, biosensing, and gene therapeutic molecules are being constructed to direct nanoparticles to desired intracellular targets. Therapeutic gene sequences are controlled by biosensor-activated control switches to provide the proper amount of gene therapy on a single cell basis. The central idea is to set up gene therapy "nanofactories" inside single living cells. Molecular biosensors linked to these genes control their expression. Gene delivery is started in response to a biosensor detected problem; gene delivery is halted when the cell response indicates that more gene therapy is not needed
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