The influence of rifle carriage on the kinetics of human gait

The influence that rifle carriage has on human gait has received little attention in the published literature. Rifle carriage has two main effects, to add load to the anterior of the body and to restrict natural arm swing patterns. Kinetic data were collected from 15 male participants, with 10 trials in each of four experimental conditions. The conditions were: walking without a load (used as a control condition); carrying a lightweight rifle simulator, which restricted arm movements but applied no additional load; wearing a 4.4 kg diving belt, which allowed arms to move freely; carrying a weighted (4.4 kg) replica SA80 rifle. Walking speed was fixed at 1.5 m/s (+5%) and data were sampled at 400 Hz. Results showed that rifle carriage significantly alters the ground reaction forces produced during walking, the most important effects being an increase in the impact peak and mediolateral forces. This study suggests that these effects are due to the increased range of motion of the body’s centre of mass caused by the impeding of natural arm swing patterns. The subsequent effect on the potential development of injuries in rifle carriers is unknown

Tractability of multivariate problems for standard and linear information in the worst case setting: part II

We study QPT (quasi-polynomial tractability) in the worst case setting for linear tensor product problems defined over Hilbert spaces. We assume that the domain space is a reproducing kernel Hilbert space so that function values are well defined. We prove QPT for algorithms that use only function values under the three assumptions: 1) the minimal errors for the univariate case decay polynomially fast to zero, 2) the largest singular value for the univariate case is simple and 3) the eigenfunction corresponding to the largest singular value is a multiple of the function value at some point. The first two assumptions are necessary for QPT. The third assumption is necessary for QPT for some Hilbert spaces

Ozonolysis of surface-adsorbed methoxyphenols: kinetics of aromatic ring cleavage vs. alkene side-chain oxidation

Lignin pyrolysis products, which include a variety of substituted methoxyphenols, constitute a major component of organics released by biomass combustion, and may play a central role in the formation of atmospheric brown carbon. Understanding the atmospheric fate of these compounds upon exposure to trace gases is therefore critical to predicting the chemical and physical properties of biomass burning aerosol. We used diffuse reflectance infrared spectroscopy to monitor the heterogeneous ozonolysis of 4-propylguaiacol, eugenol, and isoeugenol adsorbed on NaCl and α-Al₂O₃ substrates. Adsorption of gaseous methoxyphenols onto these substrates produced near-monolayer surface concentrations of 3 × 10¹⁸ molecules m⁻². The subsequent dark heterogeneous ozonolysis of adsorbed 4-propylguaiacol cleaved the aromatic ring between the methoxy and phenol groups with the product conclusively identified by GC-MS and ¹H-NMR. Kinetic analysis of eugenol and isoeugenol dark ozonolysis also suggested the formation of ring-cleaved products, although ozonolysis of the unsaturated substituent groups forming carboxylic acids and aldehydes was an order of magnitude faster. Average uptake coefficients for NaCl-adsorbed methoxyphenols were γ = 2.3 (± 0.8) × 10^−7 and 2 (± 1) × 10^−6 for ozonolysis of the aromatic ring and the unsaturated side chain, respectively, and reactions on α-Al₂O₃ were approximately two times slower. UV–visible radiation (λ > 300 nm) enhanced eugenol ozonolysis of the aromatic ring by a factor of 4(± 1) but had no effect on ozonolysis of the alkene side chain

Health Sciences Librarians’ Perceptions of Interprofessional Education & Collaboration

Objective: Librarians have a unique perspective on the value of working with other health professions. We sought to learn more about health sciences librarians' experiences with interprofessional activities and to assess their perceptions of interprofessional education (IPE) using a standard measure, the Interprofessional Education Perception Scale (IEPS). Methods: We used a cross-sectional survey design to assess librarians’ perceptions toward IPE, and to gather information on librarian participation in interprofessional activities. The survey consisted of a demographics section; the IEPS, an instrument developed to assess perceived attitudes about interdisciplinary collaboration for one’s own profession; and questions about the librarian’s prior and current experiences with IPE. It was sent via email lists to the MLA Interprofessional Education Special Interest Group (IPE-SIG), and the Research Section (RS), as a comparison group. After overlap between groups was addressed, mean IEPS scores between populations were compared to explore differences in attitudes and perceptions. Other variables of interest included years of experience as a librarian, previous career as a health professional, and experience teaching or supporting interprofessional education. We also compared librarians’ IEPS scores with those of health professional students published previously. Results: Librarians’ scores on the IEPS indicated highly positive perceptions towards IPE. There were no statistically significant differences between the IPE-SIG and RS groups (p=0.59), years of experience as a librarian (p=0.82), previous career as a health professional (p=0.91), or experience supporting IPE (p=0.16). Librarians’ mean IEPS score (262.9) was slightly less than the mean score of all health profession students (265.9) from a prior study by Hawk, but this difference was not statistically significant (p=0.43). Themes identified from two open-ended questions included librarian involvement in teaching and facilitating required learning activities for health professions students, committee involvement, and non-curricular activities such as Grand Rounds and book clubs. Five respondents addressed impact of their activities. Less frequent themes included perceiving respect for librarians as part of IPE, feeling undervalued, and desiring more involvement. Conclusion: This study provides the first data for the IEPS with health sciences librarians. The health sciences librarians who participated in this research report highly positive attitudes towards IPE, in line with the majority of other health professionals studied previously. Years of experience, previous health professional careers, and experience supporting IPE as a librarian had little bearing on the responses to the survey. This suggests that health sciences librarians have positive attitudes towards IPE, regardless of whether they directly support IPE programs

Scaling property of the critical hopping parameters for the Bose-Hubbard model

Recently precise results for the boundary between the Mott insulator phase and the superfluid phase of the homogeneous Bose-Hubbard model have become available for arbitrary integer filling factor g and any lattice dimension d > 1. We use these data for demonstrating that the critical hopping parameters obey a scaling relationship which allows one to map results for different g onto each other. Unexpectedly, the mean-field result captures the dependence of the exact critical parameters on the filling factor almost fully. We also present an approximation formula which describes the critical parameters for d > 1 and any g with high accuracy.Comment: 5 pages, 5 figures. to appear in EPJ

Target Mass Monitoring and Instrumentation in the Daya Bay Antineutrino Detectors

The Daya Bay experiment measures sin^2 2{\theta}_13 using functionally identical antineutrino detectors located at distances of 300 to 2000 meters from the Daya Bay nuclear power complex. Each detector consists of three nested fluid volumes surrounded by photomultiplier tubes. These volumes are coupled to overflow tanks on top of the detector to allow for thermal expansion of the liquid. Antineutrinos are detected through the inverse beta decay reaction on the proton-rich scintillator target. A precise and continuous measurement of the detector's central target mass is achieved by monitoring the the fluid level in the overflow tanks with cameras and ultrasonic and capacitive sensors. In addition, the monitoring system records detector temperature and levelness at multiple positions. This monitoring information allows the precise determination of the detectors' effective number of target protons during data taking. We present the design, calibration, installation and in-situ tests of the Daya Bay real-time antineutrino detector monitoring sensors and readout electronics.Comment: 22 pages, 20 figures; accepted by JINST. Changes in v2: minor revisions to incorporate editorial feedback from JINS