2,587 research outputs found
Destabilization of dark states and optical spectroscopy in Zeeman-degenerate atomic systems
We present a general discussion of the techniques of destabilizing dark
states in laser-driven atoms with either a magnetic field or modulated laser
polarization. We show that the photon scattering rate is maximized at a
particular evolution rate of the dark state. We also find that the atomic
resonance curve is significantly broadened when the evolution rate is far from
this optimum value. These results are illustrated with detailed examples of
destabilizing dark states in some commonly-trapped ions and supported by
insights derived from numerical calculations and simple theoretical models.Comment: 14 pages, 10 figure
Geometrical quadrupolar frustration in DyB
Physical properties of DyB have been studied by magnetization, specific
heat, and ultrasonic measurements. The magnetic entropy change and the
ultrasonic properties in the intermediate phase II indicate that the degeneracy
of internal degrees of freedom is not fully lifted in spite of the formation of
magnetic order. The ultrasonic attenuation and the huge softening of
in phase II suggests existence of electric-quadrupolar (orbital) fluctuations
of the 4-electron. These unusual properties originate from the geometrical
quadrupolar frustration.Comment: 4 pages, 4 figures, accepted for publication in Journal of the
Physical Society of Japa
An Experimental and Theoretical Study of the Variation of 4f Hybridization Across the La1-xCexIn3 Series
Crystal structures of a series of La1-xCexIn3 (x = 0.02, 0.2, 0.5, or 0.8)
intermetallic compounds have been investigated by both neutron and X-ray
diffraction, and their physical properties have been characterized by magnetic
susceptibility and specific heat measurements. Our results emphasize atypical
atomic displacement parameters (ADP) for the In and the rare-earth sites.
Depending on the x value, the In ADP presents either an "ellipsoidal"
elongation (La-rich compounds) or a "butterfly-like" distortion (Ce-rich
compounds). These deformations have been understood by theoretical techniques
based on the band theory and are the result of hybridization between conduction
electrons and 4f-electrons.Comment: 7 pages, 8 figure
ERP evidence suggests executive dysfunction in ecstasy polydrug users
Background: Deficits in executive functions such as access to semantic/long-term memory have been shown in ecstasy users in previous research. Equally, there have been many reports of equivocal findings in this area. The current study sought to further investigate behavioural and electro-physiological measures of this executive function in ecstasy users.
Method: Twenty ecstasy–polydrug users, 20 non-ecstasy–polydrug users and 20 drug-naïve controls were recruited. Participants completed background questionnaires about their drug use, sleep quality, fluid intelligence and mood state. Each individual also completed a semantic retrieval task whilst 64 channel Electroencephalography (EEG) measures were recorded.
Results: Analysis of Variance (ANOVA) revealed no between-group differences in behavioural performance on the task. Mixed ANOVA on event-related potential (ERP) components P2, N2 and P3 revealed significant between-group differences in the N2 component. Subsequent exploratory univariate ANOVAs on the N2 component revealed marginally significant between-group differences, generally showing greater negativity at occipito-parietal electrodes in ecstasy users compared to drug-naïve controls. Despite absence of behavioural differences, differences in N2 magnitude are evidence of abnormal executive functioning in ecstasy–polydrug users
Education Can Compensate for Society - a Bit
In this paper I reflect on the findings of a number of loosely related research projects undertaken with colleagues over the last ten years. Their common theme is equity, in formal education and beyond, in wider family and social settings, and with inequity expressed as the stratification of a variety of educational outcomes. The projects are based on a standard mixture of pre-existing records, official documents, large-scale surveys, observations, interviews and focus groups. The numeric data were largely used to create biographical models of educational experiences, and the in-depth data were used to try to explain individual decisions and disparities at each stage of the model. Data have been collected for England and Wales, in five other countries of the European Union and for Japan. A meta-view of these various findings suggests that national school intakes tend to be at least moderately segregated by prior attainment and socio-economic factors, and that learning outcomes as assessed by formal means, such as examinations, are heavily stratified by these same factors. There is no convincing evidence that compulsory schooling does very much to overcome the initial disparity in the resources and attainment of school intakes. On the other hand, there are indications that the nature of a national school system and the social experiences of young people in schools can begin to equalise educational outcomes as more widely envisaged, including learning to trust and willingness to help others, aspirations, and attitudes to continuing in education and training. The cost-free implications of the argument in this paper, if accepted, are that everything possible should be done to make school intakes comprehensive, and that explicit consideration, by teachers and leaders, of the applied principles of equity could reduce potentially harmful misunderstandings in educational contexts
The Intentional Use of Service Recovery Strategies to Influence Consumer Emotion, Cognition and Behaviour
Service recovery strategies have been identified as a critical factor in the success of. service organizations. This study develops a conceptual frame work to investigate how specific service recovery strategies influence the emotional, cognitive and negative behavioural responses of . consumers., as well as how emotion and cognition influence negative behavior. Understanding the impact of specific service recovery strategies will allow service providers' to more deliberately and intentionally engage in strategies that result in positive organizational outcomes. This study was conducted using a 2 x 2 between-subjects quasi-experimental design. The results suggest that service recovery has a significant impact on emotion, cognition and negative behavior. Similarly, satisfaction, negative emotion and positive emotion all influence negative behavior but distributive justice has no effect
What impact does written information about fatigue have on patients with autoimmune rheumatic diseases? : Findings from a qualitative study
Objectives Although fatigue is a common symptom for people with rheumatic diseases, limited support is available. This study explored the impact of written information about fatigue, focusing on a booklet, Fatigue and arthritis. Methods Thirteen patients with rheumatic disease and fatigue were recruited purposively from a rheumatology outpatient service. They were interviewed before and after receiving the fatigue booklet. Two patients, plus six professionals with relevant interests, participated in a focus group. Transcripts were analysed thematically and a descriptive summary was produced. Results Interviewees consistently reported that fatigue made life more challenging, and none had previously received any support to manage it. Reflecting on the booklet, most said that it had made a difference to how they thought about fatigue, and that this had been valuable. Around half also said that it had affected, or would affect, how they managed fatigue. No one reported any impact on fatigue itself. Comments from interviewees and focus group members alike suggested that the research process may have contributed to the changes in thought and behaviour reported. Its key contributions appear to have been: clarifying the booklet's relevance; prompting reflection on current management; and introducing accountability. Conclusions This study indicated that written information can make a difference to how people think about fatigue and may also prompt behaviour change. However, context appeared to be important: it seems likely that the research process played a part and that the impact of the booklet may have been less if read in isolation. Aspects of the research appearing to facilitate impact could be integrated into routine care, providing a pragmatic (relatively low-cost) response to an unmet need
The Vehicle, Fall 1985
Vol. 27, No. 1
Table of Contents
Satchel AssMichael D. Smithpage 3
PhotoDoug Andersonpage 7
CounselingChristy Dunphypage 8
Grave SiteJay D. Fiskpage 8
Sight-Seeing Outside PhoenixBob Zordanipage 9
PerformanceDan Von Holtenpage 10
NightmareKandy Bellpage 10
Photo (The Loft)Lawrence McGownpage 11
LaboringJanet Gracepage 12
Blood DonorDan Von Holtenpage 13
Photo (Pier)Lawrence McGownpage 14
ExamplesChristopher Albinpage 14
Three PoemsPatrick Peterspage 15
Sometimes I Dream in Cotton CandyKathy Graypage 16
One Day While BoatingF. Link Rapierpage 17
DepartureBob Zordanipage 17
140 Print That\u27s Life Peter Dowlingpage 18
Photo (Around the Bend)Mike Freckerpage 20
Light ConversationDan Hintzpage 22
She Waits For the WorldJim Harrispage 22
HoneyKathy Graypage 23
Photo AlbumPatrick Peterspage 24
Photo (Stairs)Lawrence McGownpage 25
Fallen From Grace to SaturdayF. Link Rapierpage 26
Post MortemF. Link Rapierpage 27
ConfessionJohn Kayserpage 27
Child\u27s PlayChristopher Albinpage 27
Seeking A Friend\u27s Advice on DietingKathy Graypage 28
PhotoDoug Andersonpage 28
She Came Back to MeJim Harrispage 29
Farm BoyDiana Winsonpage 30
DilemmaJanet Wilhelmpage 31
In a Rock or StoneRichard Donnellypage 32
In November He Came To MeJean Kover Chandlerpage 33
EndingChristy Dunphypage 34
The Honor GradEddie Simpsonpage 35
Photo (Thirst)Mike Freckerpage 40https://thekeep.eiu.edu/vehicle/1046/thumbnail.jp
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