44,707 research outputs found
Validation of the reasons for gambling questionnaire (RGQ) in a British population survey
No full textIntroduction. The aim of the study is to validate the five-dimensional structure of the Reasons for Gambling Questionnaire (RGQ) and to test the differences between different types of gamblers (i.e., offline gamblers who gambled in-person only vs.mixed-mode gamblers who gambled both online and offline) on the five dimensions of the RGQ. Methods. Data from the 2010 British Gambling Prevalence Survey (BGPS) were used. The analysed data comprised 5,677 individuals (52.7% female; mean age=47.64 years; SD=17.82). Confirmatory factor analysis and independent-samples t-tests were applied. Results. The five-dimensional structure of the RGQ wasconfirmed in the general sample and among gender and age subgroups. Furthermore, mixed-mode gamblers (MMGs) who gambled both online and offline had higher scores for enhancement, recreation and money motives than offline gamblers that gambled in-person only (IPGs). In addition among males, there was a significant difference in the scores for enhancement and recreation motives across MMGs and IPGs. Among past-year gamblers aged 16-34 years, MMGs had higher scores for enhancement, recreational and monetary motives than IPGs whilst among past-year gamblers aged 35-55years, MMGs had higher scores for enhancement and recreational motives than IPGs. Conclusions. The results are consistent with a previous test of the RGQ and the findings indicate that the RGQis a valid instrument to assess gambling motives among the general population
Signatures of a Quantum Griffiths Phase in a D-Metal Alloy Close to Its Ferromagnetic Quantum Critical Point
No full textWe report magnetization measurements close to the ferromagnetic quantum phase transition of the d-metal alloy Ni1-xVx at a vanadium concentration of xc ≈ 11.4%. In the diluted regime (x \u3e xc), the temperature (T) and magnetic field (H) dependences of the magnetization are characterized by nonuniversal power laws and display H/T scaling in a wide temperature and field range. The exponents vary strongly with x and follow the predictions of a quantum Griffiths phase. We also discuss the deviations and limits of the quantum Griffiths phase as well as the phase boundaries due to bulk and cluster physics
Transport properties in antiferromagnetic quantum Griffiths phases
No full textWe study the electrical resistivity in the quantum Griffiths phase associated with the antiferromagnetic quantum phase transition in a metal. The resistivity is calculated by means of the semi-classical Boltzmann equation. We show that the scattering of electrons by locally ordered rare regions leads to a singular temperature dependence. The rare-region contribution to the resistivity varies as Tλ with temperature T, where λ is the usual Griffiths exponent which takes the value zero at the critical point and increases with distance from criticality. We find similar singular contributions to other transport properties such as thermal resistivity, thermopower and the Peltier coefficient. We also compare our results with existing experimental data and suggest new experiments
A Systematic Review of Online Sex Addiction and Clinical Treatments Using CONSORT Evaluation
No full textResearchers have suggested that the advances of the Internet over the past two decades have gradually eliminated traditional offline methods of obtaining sexual material. Additionally, research on cybersex and/or online sex addictions has increased alongside the development of online technology. The present study extended the findings from Griffiths’ (2012) systematic empirical review of online sex addiction by additionally investigating empirical studies that implemented and/or documented clinical treatments for online sex addiction in adults. A total of nine studies were identified and then each underwent a CONSORT evaluation. The main findings of the present review provide some evidence to suggest that some treatments (both psychological and/or pharmacological) provide positive outcomes among those experiencing difficulties with online sex addiction. Similar to Griffiths’ original review, this study recommends that further research is warranted to establish the efficacy of empirically driven treatments for online sex addiction
Tropidophora sericea Griffiths & Herbert 2013, sp. n.
No full textTropidophora sericea sp. n. Fig. 9 Etymology: From Latin sericeus (silky); in reference to the silky texture of the shell. Diagnosis: Spire very low, shell almost planorboid, body whorl not conspicuously tumescent, umbilicus very wide; columella lip weakly reflected, but not broadly expanded over umbilicus; sculpture finely decussate, comprising low, close-set spiral ridges crossed by similar axial pliculae; yellowish white with traces of fine orange-brown spiral lines. Description: Shell: Medium to large, depressed-discoidal to planorboid, spire very low with little other than embryonic whorls projecting in apertural view; final part of last adult whorl descending gently prior to aperture; whorls more or less evenly rounded, suture indented; umbilicus very wide, its margin evenly rounded; underside of embryonic whorls clearly visible. Protoconch of 1¼–1½ whorls, essentially smooth, but microscopically shagreened. Teleoconch of a further 2¾–3 whorls; first whorl initially with 6 or 7 low spiral ridges increasing to double this by end of whorl; ridges crossed by numerous, close-set axial pliculae producing a finely decussate sculpture; intervals between ridges 2–3 times wider than those between pliculae; subsequent whorls with additional spiral ridges arising by intercalation, but sculpture remaining finely decussate more or less throughout, including base; spiral ridges more close-set on later whorls and sculptural interstices less axially elongate; ridges with minute granules where crossed by axial pliculae. Aperture subcircular, strongly oblique to vertical axis of shell; peristome virtually complete, somewhat angled in parietal region; aperture expanding slightly prior to lip and lip also weakly reflected. Ground colour dirty white to yellowish buff; the freshest specimens retaining evidence of a pattern of fine orange-brown spiral lines above the periphery, that at periphery strongest; similar lines just below periphery but umbilicus and most of base lacking colour pattern. Dimensions: Holotype, max. diameter 37.3 mm, height 18.9 mm; largest specimen, max. diameter 41.4 mm. Holotype: MADAGASCAR: Central W Madagascar, ca 60 km E of Maintirano, NE of Belitsaka, central part of Tsingy Beanka, in slots and small caves above Bokarano R. gorge, next to low dry deciduous forest, 17.90517°S 44.48240°E, ca 215 m, 22.ix.2010, O. Griffiths & R. Randalana, st’n 09/10 (AMS C.474166). Paratypes: Same data as holotype (NMSA L8524 /T2979, 3 specimens); st’n 06/09 (AMS C.469585, 3 adult specimens); st’n 07/09 (TMAM T161, 1 adult specimen); st’n 08/09 (AMS C.469586, 9 adult specimens); st’n 08/10 (MHNP IM-2010-20083, 4 adult specimens). Additional locality data: Tsingy Beanka: st’ns 06/10, 07/10, 09/12. Distribution: A narrow-range endemic; currently known only from the central region of the Tsingy Beanka. Habitat: Found only in subfossil form in deep slots and crevices within the tsingy, in dry deciduous forest. Remarks: Like T. humbug, this species is referable to the ‘groupe d’espèces du T. deshayesiana (Petit de la Saussaye, 1844) ’ of Fischer-Piette et al. (1993). Within this group, it is closest to T. chavani Fischer-Piette, 1949 (see above) in having a very low spire, relatively fine spiral sculpture and a colour pattern of narrow, brownish, spiral bands. It is, however, considerably larger than T. chavani, attaining as much as 41.4mm in max. diameter (compared to 32 mm for T. chavani). Furthermore, its sculpture is considerably finer than that of T. chavani, with subequal spiral and axial elements. In T. chavani the axial pliculae are crisp, and much finer and more close-set than the spiral cords (compare Figs 9D and 9E).At some localities, T. chavani occurs in subfossil form together with T. sericea, but the two remain clearly distinct. T. moulinsii (Grateloup, 1840) (Fig. 26A–C, holotype, NHMUK) and T. thesauri Fischer-Piette, 1949 (Fig. 26D–F), both from the north-eastern tip of Madagascar, are of a more similar size (attaining 38 mm or more in max. diameter), but T. thesauri has much deeper whorls, a higher spire, narrower umbilicus, irregular scale-like subsutural pliculae and lacks the finely decussate microsculpture of T. sericea. T. moulinsii has stronger, cord-like, spiral sculpture, more tumescent whorls and a higher spire.Published as part of Griffiths, O. L. & Herbert, D. G., 2013, New species of land snails (Mollusca: Gastropoda) from two isolated karst formations in central western Madagascar: Tsingy Beanka and Antsingimavo, with additional notes on other regional endemics, pp. 1-48 in African Invertebrates 54 (1) on pages 13-14, DOI: 10.5733/afin.054.0101, http://zenodo.org/record/767010
Quantum Griffiths effects in metallic systems
No full textWe show that two apparently contradictory theories on the
existence of Griffiths-McCoy singularities in magnetic metallic
systems (see Castro Neto A. H. and Jones B. A.,
Phys. Rev. B 62 (2000) 14975 and Millis A. J.,
Morr D. and Schmalian J., Phys. Rev.
B 66 (2002) 174433) are in fact mathematically equivalent. We
discuss the generic phase diagram of the problem and show that
there is a non-universal crossover temperature range
where power law behavior (Griffiths-McCoy
behavior) is expected. For power law behavior ceases to
exist due to the destruction of quantum effects generated by the
dissipation in the metallic environment. We show that T* is an
analogue of the Kondo temperature and is controlled by
non-universal couplings
Video game addiction: past, present and future
No full textGaming addiction has become a topic of increasing research interest. The last decade has witnessed a significant increase in the number of empirical studies examining various aspects of problematic video game play and video game addiction. This paper begins with a brief past history of how research into video game addiction has changed over the last three decades (i.e., the 1980s, 1990s and 2000s). It then examines more thoroughly the contemporary research literature by analyzing the (i) prevalence of problematic video game use and video game addiction, (ii) negative consequences of excessive video game use, (iii) factors associated with problematic video game use and video game addiction, and (iv) the treatment of problematic video game use and video game addiction. The paper concludes by looking at the trends in the field and a somewhat theoretical examination of what the future of video game addiction might be.Mark D. Griffiths, Daria J. Kuss and Daniel L. Kin
D. T. Max, 36th Annual ODU Literary Festival
No full textD. T. Max is a graduate of Harvard University and a staff writer at The New Yorker. His new book, Every Love Story Is A Ghost Story: A Life of David Foster Wallace, was released in August 2012 and was a New York Times best-seller. He is also the author of The Family That Couldn\u27t Sleep: A Medical Mystery
Patients who have had fractures ?f the distal forearm do not lose bone as expected
No full textEditor - Women's lifetime risk of experiencing a fracture of the distal forearm is 15%.x Such fractures are associated with considerable pain and morbidity. They are also associated with an increased risk of vertebral fracture,2 although these anatomical sites have different bone compositions, with the forearm being composed predominantly of cortical bone whereas the spin
Fire frequency matters more than fire size: testing the pyrodiversity-biodiversity paradigm for at-risk small mammals in an Australian tropical savanna
No full textAbstract not availableAnthony D. Griffiths, Stephen T. Garnett, Barry W. Broo
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