Measurement of the Nucleon Structure Function F2 in the Nuclear Medium and Evaluation of its Moments

We report on the measurement of inclusive electron scattering off a carbon target performed with CLAS at Jefferson Laboratory. A combination of three different beam energies 1.161, 2.261 and 4.461 GeV allowed us to reach an invariant mass of the final-state hadronic system W~2.4 GeV with four-momentum transfers Q2 ranging from 0.2 to 5 GeV2. These data, together with previous measurements of the inclusive electron scattering off proton and deuteron, which cover a similar continuous two-dimensional region of Q2 and Bjorken variable x, permit the study of nuclear modifications of the nucleon structure. By using these, as well as other world data, we evaluated the F2 structure function and its moments. Using an OPE-based twist expansion, we studied the Q2-evolution of the moments, obtaining a separation of the leading-twist and the total higher-twist terms. The carbon-to-deuteron ratio of the leading-twist contributions to the F2 moments exhibits the well known EMC effect, compatible with that discovered previously in x-space. The total higher-twist term in the carbon nucleus appears, although with large systematic uncertainites, to be smaller with respect to the deuteron case for n<7, suggesting partial parton deconfinement in nuclear matter. We speculate that the spatial extension of the nucleon is changed when it is immersed in the nuclear medium.Comment: 37 pages, 15 figure

All-particle cosmic ray energy spectrum measured with 26 IceTop stations

We report on a measurement of the cosmic ray energy spectrum with the IceTop air shower array, the surface component of the IceCube Neutrino Observatory at the South Pole. The data used in this analysis were taken between June and October, 2007, with 26 surface stations operational at that time, corresponding to about one third of the final array. The fiducial area used in this analysis was 0.122 km^2. The analysis investigated the energy spectrum from 1 to 100 PeV measured for three different zenith angle ranges between 0{\deg} and 46{\deg}. Because of the isotropy of cosmic rays in this energy range the spectra from all zenith angle intervals have to agree. The cosmic-ray energy spectrum was determined under different assumptions on the primary mass composition. Good agreement of spectra in the three zenith angle ranges was found for the assumption of pure proton and a simple two-component model. For zenith angles {\theta} < 30{\deg}, where the mass dependence is smallest, the knee in the cosmic ray energy spectrum was observed between 3.5 and 4.32 PeV, depending on composition assumption. Spectral indices above the knee range from -3.08 to -3.11 depending on primary mass composition assumption. Moreover, an indication of a flattening of the spectrum above 22 PeV were observed.Comment: 38 pages, 17 figure

The state of the Martian climate

60°N was +2.0°C, relative to the 1981–2010 average value (Fig. 5.1). This marks a new high for the record. The average annual surface air temperature (SAT) anomaly for 2016 for land stations north of starting in 1900, and is a significant increase over the previous highest value of +1.2°C, which was observed in 2007, 2011, and 2015. Average global annual temperatures also showed record values in 2015 and 2016. Currently, the Arctic is warming at more than twice the rate of lower latitudes

The practice of prescribing: Discovering differences in what we tell patients about prescription medications

Objective: This study explored patient recall of clinician presentation of information about prescription medication, looking specifically for communication patterns and differences by patient individual characteristics and by medication availability type. Methods: A cross sectional survey collected information about 216 patients’ perceptions of clinician presentations of medication information. Results: Demographically, males recalled receiving more information about reasons, risks, and regimen in medication discussions. By medication type, patients reported receiving more medication information when the clinician presented a prescription-only medication as opposed to a medication that was also available over the counter. Conclusion: Given the broad and unmonitored use of over-the-counter products, coupled with the increasing awareness of risks associated with many of these medications, it is concerning that patients report receiving less information about these products. Practice implications: The emphasis on appropriate medication counseling should not be limited to medications available only by prescription. Prescribers should be mindful of these potential tendencies when discussing medications

Relationship of training in acupuncture to physician burnout

© J Am Board Fam Med: first published as 10.3122/jabfm.2019.02.180204 on 8 March 2019. Downloaded from http://www.jabfm.org/ on 17 April 2019 by guest. Protected by copyright. Background: Physician burnout is an ongoing problem that affects both physician wellbeing and patient care. Burnout is characterized by emotional exhaustion and depersonalization. Studies have explored ways to prevent and alleviate burnout. Receiving training in acupuncture may reduce physician burnout. Objective: The purpose of this study is to determine if acupuncture training is associated with less patient depersonalization and less emotional exhaustion among physicians. Methods: These self-reported data were collected from a cross-sectional survey of family physicians at the Uniformed Services Academy of Family Physicians 2017 conference. Physicians answered questions regarding their level of acupuncture training as well as questions about burnout (depersonalization and emotional exhaustion). Results: The overall response rate was 66% (325/492). Of these, 233 cases provided complete datasets. In a model controlling for years practice and clinical pace, acupuncture training was significantly associated with decreased depersonalization, F (1, 194) =5.82, P \u3c .05. Conclusion: Study data show an association between decreased physician depersonalization and acupuncture training, suggesting acupuncture training may be a helpful strategy to reduce family physicians depersonalization of patients. (J Am Board Fam Med 2019;32:259 -263.)