1,371 research outputs found

    The Ursinus Weekly, November 4, 1963

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    Speech by local leader highlights Founders Day • AAUW to meet on Ursinus campus • Dr. Robert Howard named to Who\u27s who • 40 music lovers to hear concert • Quaker journalist to present lecture on Cuban visit • Election of queen to begin Homecoming festivities • Peace pilgrim visits campus • Improved Lantern planned by editors • Folk singer to appear at UC Friday night • IFC plans party as Homecoming opener • Summer reading sessions end • New officer to present Wave program Nov. 7 • Items from abroad • Letters to the editor • Foreign students give views of US • Main Line Symphony announces guest soloist • Dear Wormwood cast in rehearsal • Youth organizes for Goldwater • Greek gleanings • Student organizing group to work at St. Gabriel\u27s • MSGA busy with many new projects • Mrs. Parsons to address Ursinus Circle Nov. 7 • Bears run into Seahawk deepfreeze • Intramural corner • Interview: Bob Mashock • Soccer team set back despite fine efforts • UC hockey teams win againhttps://digitalcommons.ursinus.edu/weekly/1256/thumbnail.jp

    Optimizing Power Consumption of Freight Railroad Bearings Using Laboratory Experimental Data

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    Based on projected freight truck fuel efficiency, freight railroad and equipment suppliers need to identify, evaluate and implement technologies and/or operating practices to maintain traditional railroad economic competitiveness. The railway industry uses systems that record the total energy efficiency of a train but not energy efficiency or consumption by components. Lowering the energy consumption of certain train components will result in an increase in its overall energy efficiency, which will yield cost benefits for all the stakeholders. One component of interest is the railroad bearing whose power consumption varies depending on several factors that include railcar load, train speed, condition of bearing whether it is healthy or defective, and type of defect. Being able to quantify the bearing power consumption, as a function of the variables mentioned earlier, would make it possible to obtain optimal operating condition ranges that minimize energy consumption and maximize train energy efficiency. Several theoretical studies were performed to estimate the power consumption within railroad bearings, but those studies lacked experimental validation. For almost a decade now, the University Transportation Center for Railway Safety (UTCRS) at the University of Texas Rio Grande Valley (UTRGV) has been collecting power consumption data for railroad bearings under various loads, speeds, ambient temperatures, and bearing condition. The objective of this ongoing study is to use the experimentally acquired power consumption to come up with a correlation that can be used to quantify the bearing power consumption as a function of load, speed, ambient temperature, and bearing condition. Once obtained, the model can then be used to determine optimal operating practices that maximize the railroad bearing energy efficiency. In addition, the developed model will provide insight into possible areas of improvement for the next generation of energy efficient railroad bearings. This paper will discuss ongoing work including experimental setup and findings of energy consumption of bearings as function of railcar load, train speed, condition of bearing whether it is healthy or defective, and type of defect. Findings of energy consumption are converted into approximations of diesel gallons to quantify the effect of nominal energy consumption of the bearings and show economic value and environmental impact

    Ultrafast Electronic Disordering During Femtosecond Laser Melting of GaAs

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    We have observed an ultrarapid electronic phase transformation to a centrosymmetric electronic state during laser excitation of GaAs with intense femtosecond pulses. Reflection second-harmonic intensity from the upper 90 atomic layers vanishes within 100 fs; reflectivity rises within 0.5 ps to a steady value characteristic of a metallic molten phase, long before phonon emission can heat the lattice to the melting temperature

    Heritability and the Equal Environments Assumption: Evidence from Multiple Samples of Misclassified Twins

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    The final publication is available at Springer via https://doi.org/10.1007/s10519-013-9602-1Classically derived estimates of heritability from twin models have been plagued by the possibility of genetic-environmental covariance. Survey questions that attempt to measure directly the extent to which more genetically similar kin (such as monozygotic twins) also share more similar environmental conditions represent poor attempts to gauge a complex underlying phenomenon of GE-covariance. The present study exploits a natural experiment to address this issue: Self-misperception of twin zygosity in the National Longitudinal Survey of Adolescent Health (Add Health). Such twins were reared under one “environmental regime of similarity” while genetically belonging to another group, reversing the typical GE-covariance and allowing bounded estimates of heritability for a range of outcomes. In addition, we examine twins who were initially misclassified by survey assignment—a stricter standard—in three datasets: Add Health, the Minnesota Twin Family Study and the Child and Adolescent Twin Study in Sweden. Results are similar across approaches and datasets and largely support the validity of the equal environments assumption

    Correction to : 1H, 13C, 15N backbone and IVL methyl group resonance assignment of the fungal β-glucosidase from Trichoderma reesei (Biomolecular NMR Assignments, (2020), 10.1007/s12104-020-09959-2)

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    In the original publication of the article, the name of one of the authors is incorrect. The author's name is Eiso AB, but was modified to A. B. Eiso. The correct name is given in this Correction

    Anisotropies in the diffuse gamma-ray background measured by the Fermi-LAT

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    The small angular scale fluctuations of the (on large scale) isotropic gamma-ray background (IGRB) carry information about the presence of unresolved source classes. A guaranteed contribution to the IGRB is expected from the unresolved gamma-ray AGN while other extragalactic sources, Galactic gamma-ray source populations and dark matter Galactic and extragalactic structures (and sub-structures) are candidate contributors. The IGRB was measured with unprecedented precision by the Large Area Telescope (LAT) on-board of the Fermi gamma-ray observatory, and these data were used for measuring the IGRB angular power spectrum (APS). Detailed Monte Carlo simulations of Fermi-LAT all-sky observations were performed to provide a reference against which to compare the results obtained for the real data set. The Monte Carlo simulations are also a method for performing those detailed studies of the APS contributions of single source populations, which are required in order to identify the actual IGRB contributors. We present preliminary results of an anisotropy search in the IGRB. At angular scales <2° (e.g., above multipole 155), angular power above the photon noise level is detected, at energies between 1 and 10 GeV in each energy bin, with statistical significance between 7.2 and 4.1σ. The obtained energy dependences point to the presence of one or more unclustered source populations with the components having an average photon index Γ=2.40±0.07

    Anisotropies in the diffuse gamma-ray background measured by Fermi LAT

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    The small angular scale fluctuations of the (on large scale) isotropic gamma-ray background (IGRB) carry information about the presence of unresolved source classes. A guaranteed contribution to the IGRB is expected from the unresolved gamma-ray AGN while other extragalactic sources, Galactic gamma-ray source populations and dark matter Galactic and extragalactic structures (and sub-structures) are candidate contributors. The IGRB was measured with unprecedented precision by the Large Area Telescope (LAT) on-board of the Fermi gamma-ray observatory, and these data were used for measuring the IGRB angular power spectrum (APS). Detailed Monte Carlo simulations of Fermi-LAT all-sky observations were performed to provide a reference against which to compare the results obtained for the real data set. The Monte Carlo simulations are also a method for performing those detailed studies of the APS contributions of single source populations, which are required in order to identify the actual IGRB contributors. We present preliminary results of an anisotropy search in the IGRB. At angular scales <2deg (e.g. above multipole 155), angular power above the photon noise level is detected, at energies between 1 and 10 GeV in each energy bin, with statistical significance between 7.2 and 4.1 sigmas. The energy not dependence of the fluctuation anisotropy is pointing to the presence of one or more unclustered source populations, while the energy dependence of the intensity anisotropy is consistent with source populations having average photon index 2.40\pm0.07.Comment: 6 pages, Proceedings of the RICAP 2011 Conference, submitted to NIM

    Research and education in management of large-scale technical programs

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    A research effort is reported which was conducted by NASA in conjunction with Drexel University, and which was aimed at an improved understanding of large scale systems technology and management

    Laser-induced solid-solid phase transition in As under pressure: A theoretical prediction

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    In Arsenic a pressure-induced solid-solid phase transition from the A7 into the simple cubic structure has been experimentally demonstrated [Beister et al., Phys. Rev. B 41, 5535 (1990)]. In this paper we present calculations, which predict that this phase transition can also be induced by an ultrashort laser pulse in As under pressure. In addition, calculations for the pressure-induced phase transition are presented. Using density functional theory in the generalized gradient approximation, we found that the pressure-induced phase transition takes place at 26.3 GPa and is accompanied by a volume change "Delta V" = 0.5 bohr^3/atom. The laser-induced phase transition is predicted for an applied pressure of 23.8 GPa and an absorbed laser energy of 2.8 mRy/atom.Comment: 9 pages, 5 figures Changes to content To be published in New Journal of Physics (accepted for publication

    The Ursinus Weekly, May 13, 1963

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    Bears annex first MAC championship • Cold weather doesn\u27t freeze Mississippi mud • Senior show slated for May 16 • Sir George Thomson, famed physicist, to speak at Commencement exercises • Joyce Maloney wins title of Miss Montgomery County • Registration open for Summer school • Angelo Cutone, custodian, plans return to Italy • Pre-med society selects officers • Music Club names 1963-64 officers • Shinnick, Kelly, Gould elected class presidents • Whitians elect 1963-64 leaders • Dr. Steere urges understanding • Peggy Cooper new head cheerleader • GOP elects officers • New officers • As Helfferich leaves Girard Trust • Greek gleanings • UC Band presents Spring concert • Minutes of MSGA • Tibetan lamas • Fine casting and producing lead Staring match to success • Ursinus smites fiery Dragons 8-1; Bears give explorers victory 9-5 • Tennis team trims the Main Line • Jim Egolf: Freshman find • Ursinus racketeers stumble • Haverford beaten second time, 6-2 • UC shears Ewes • Bears drop Shoremen from undefeated ranks • Lacrosse team drops WC, 6-4https://digitalcommons.ursinus.edu/weekly/1296/thumbnail.jp
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