82 research outputs found
Energy Flow in the Hadronic Final State of Diffractive and Non-Diffractive Deep-Inelastic Scattering at HERA
An investigation of the hadronic final state in diffractive and
non--diffractive deep--inelastic electron--proton scattering at HERA is
presented, where diffractive data are selected experimentally by demanding a
large gap in pseudo --rapidity around the proton remnant direction. The
transverse energy flow in the hadronic final state is evaluated using a set of
estimators which quantify topological properties. Using available Monte Carlo
QCD calculations, it is demonstrated that the final state in diffractive DIS
exhibits the features expected if the interaction is interpreted as the
scattering of an electron off a current quark with associated effects of
perturbative QCD. A model in which deep--inelastic diffraction is taken to be
the exchange of a pomeron with partonic structure is found to reproduce the
measurements well. Models for deep--inelastic scattering, in which a
sizeable diffractive contribution is present because of non--perturbative
effects in the production of the hadronic final state, reproduce the general
tendencies of the data but in all give a worse description.Comment: 22 pages, latex, 6 Figures appended as uuencoded fil
A Search for Selectrons and Squarks at HERA
Data from electron-proton collisions at a center-of-mass energy of 300 GeV
are used for a search for selectrons and squarks within the framework of the
minimal supersymmetric model. The decays of selectrons and squarks into the
lightest supersymmetric particle lead to final states with an electron and
hadrons accompanied by large missing energy and transverse momentum. No signal
is found and new bounds on the existence of these particles are derived. At 95%
confidence level the excluded region extends to 65 GeV for selectron and squark
masses, and to 40 GeV for the mass of the lightest supersymmetric particle.Comment: 13 pages, latex, 6 Figure
Consumer-Based Leisure Constraint for Online Gaming
[[abstract]]The purpose of this study is to develop a multidimensional measure of consumer-based leisure constraint for online game play and to assess its psychometric properties. An empirical model of player constraint in online games provides the foundation to understanding and assessing how players differ from one another (such as high gamers/low gamers and high gamers/non-gamers) and how constraints on play relate to frequency of use. In the current study, an exploratory factor analysis was used to extract the common factors, and confirmatory factor analysis was used to create an empirical model of players' perception of constraint and to reveal its underlying structure. The analysis revealed six dimensions of constraint. The relationship between perception of constraint and frequency of use is also presented.[[notice]]補正完畢[[incitationindex]]SSCI[[booktype]]電子版[[booktype]]紙
Effects of low-phytic acid corn on growth performance, bone strength, and serum osteocalcin concentration in growing-finishing pigs
A 91-d experiment was conducted to evaluate whether low-phytic acid corn (NDLP, Exseed Genetics) (90% phosphorus (P) availability) could replace dent corn (DC) without adversely affecting growth performance or bone parameters in growing-finishing pigs. Total Pand phytate P were 0.24 and 0.16% in DC; 0.32 and 0.03% in NDLP, by analysis. Pigs were blocked by initial BW (18.5 to 22.5 kg) into four pens per treatment (trt) of eight crossbred pigs per pen. Two trts were fed; trt 1 contained DC and trt 2 contained NDLP. Three phases were fed; each was four wks in length. Dietary calcium and non-phytate Pw ere computed to provide 0.75 and 0.36, 0.63 and 0.30, or 0.55 and 0.28% in phases I, II, and III, respectively. Total Pw as computed to provide 0.57, 0.50, or 0.47% for trt 1; and 0.47, 0.40, or 0.36% for trt 2, in phases I, II, and III, respectively. Dicalcium phosphate concentration was decreased by 0.73, 0.78, and 0.85% units in trt 2, for phases I, II, and III, respectively. One gilt per pen was chosen, based on average pen BW (92 to 106 kg), for slaughter at 91d. All third and fourth metacarpals (MC) and metatarsals (MT) were used to analyze bone-breaking strength. Blood was collected from two pigs per pen at 90d for serum osteocalcin (OC) analysis (an indicator of bone turnover). Gain/feed (trt 1 = 316, trt 2 = 350, P > 0.09), BW (trt 1 = 97.3 kg, trt 2 = 98.7 kg, P > 0.71), and ADG (trt 1 = 840 g/d, trt 2 = 860 g, P > 0.57) were not affected. There were no differences in bone strength of third and fourth MC and fourth MT bones (P > 0.28). Overall, MC and MT bone strength was higher (15.04 vs. 12.83 MPa, P 0.92), suggesting no difference in bone turnover. This study proposes that NDLPcorn can be formulated with 90% Pa vailability and replace dent corn without adversely affecting pig performance
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