cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Two-way Interference Channels
Creators: name: Suh, Changho
name: Wang, I-Hsiang
name: Tse, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider two-way interference channels (ICs) where forward and backward channels are ICs but not necessarily the same. We first consider a scenario where there are only two forward messages and feedback is offered through the backward IC for aiding forward-message transmission. For a linear deterministic model of this channel, we develop inner and outer bounds that match for a wide range of channel parameters. We find that the backward IC can be more efficiently used for feedback rather than if it were used for sending its own independent backward messages. As a consequence, we show that feedback can provide a net increase in capacity even if feedback cost is taken into consideration. Moreover we extend this to a more general scenario with two additional independent backward messages, from which we find that interaction can provide an arbitrarily large gain in capacity.
description: submitted to the IEEE International Symposium on Information Theory 2012
Characterization of a Group II Intron and its Intron-Encoded Protein
Creators: name: Semper, Cameron
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Biochemistry

description: Group II introns are a class of mobile genetic elements found in the genomes of bacteria, archaea and in the organellar genomes of some eukaryotes. They are comprised of a large structural RNA with ribozyme activity and a multi-functional intron-encoded protein. The IEP encodes four domains: reverse-transcriptase, maturase, DNA-binding and endonuclease domains. The RNA and IEP interact to form a functional ribonucleoprotien that facilitates the two activities of group II introns, splicing and mobility. The interaction between group IIA introns and their IEPs has been well characterized; however, many of the details regarding the IIC intron-IEP interaction are poorly understood. This dissertation examines the interaction between the B.h.I1 group II intron and its intron-encoded protein. The B.h.I1 intron is a class IIC intron encoding an IEP that lacks the endonuclease domain. The intron is found in the organism Bacillus halodurans and exhibits clear evidence of retroelement behaviour, inserting downstream of intrinsic transcriptional terminators. In order to better characterize the intron-IEP interaction, it was determined that significant improvement to the IEP purification was required. Through a combination of optimization of expression and FPLC the yield and purity of the IEP was improved significantly. With purified components in sufficient quantity, the hypothesis that IIA and IIC IEPs recognize different high-affinity binding sites was examined using an in vitro mobility assay. Ultimately it was determined that IIC IEPs recognize a structurally similar but functionally different high-affinity binding site than is recognized by IIA-encoded IEPs. During binding site experiments, it was determined that the B.h.I1 intron uses the same IEP binding-site for splicing and mobility, reconciling a previously observed inconsistency. A kinetic characterization found that the B.h.I1-IEP interaction occurs with lower affinity compared to the IIA intron and that the B.h.I1 intron-IEP interaction relies more heavily on secondary contacts made outside the high-affinity binding site. Finally, data obtained from cross-linking experiments implicate the IEP in recognition of the 3’ exon, a previously undiscovered function of the IEP in intron mobility. Though subtle, the differences observed for the IIC intron-IEP interaction appear to facilitate the specific requirements of its genomic niche.
High--field NMR of the quasi--1D antiferromagnet LiCuVO$_4$
Creators: name: Buttgen, N.
name: Kuhns, P.
name: Prokofiev, A.
name: Reyes, A. P.
name: Svistov, L. E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on NMR studies of the quasi one--dimensional (1D) antiferromagnetic $S=1/2$ chain cuprate LiCuVO$_4$ in magnetic fields $H$ up to $μ_0H$ = 30 T ($\approx 70$% of the saturation field $H_{\rm sat}$). NMR spectra in fields higher than $H_{\rm c2}$ ($μ_0H_{\rm c2} \approx 7.5$ T) and temperatures $T
Control of Microbial Sulfide Production in Low and High Temperature Oil Field with Nitrate and Perchlorate
Creators: name: Okpala, Gloria
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Oil field
subject: Sulfate reduction
subject: Nitrate reduction
subject: Perchlorate reduction
subject: Microbial community

description: The activity of sulfate reducing bacteria (SRB), which produce sulfide, in low and high temperature oilfields, poses a severe challenge for oil and gas industries. Nitrate injection is used to limit the growth of SRB, through stimulation of nitrate reducing bacteria (NRB) that reduce nitrate to nitrite and subsequently to N2. Data from temperature dependent studies done in this work reveal thermophilic nitrate reducing bacteria (tNRB) isolated from low and high temperature oilfields reduce nitrate to nitrite and not further at 50°C or above. This observation is especially important for nitrate-mediated control of sulfide production in high temperature oil fields, because nitrite is a strong SRB inhibitor. To better understand how nitrate injection works in a seawater flooded high temperature reservoir, dual temperature bioreactors and multi-temperature microcosms were used in monitoring sulfate reduction by mesophilic and thermophilic NRB and SRB. The results indicated that nitrate may be ineffective when injected into a cold zone (<45°C) and that preventing emergence of such a zone by injecting hot produced water may be an effective way to control souring with nitrate. Control of souring with perchlorate under low temperature conditions in batch incubations and bioreactors containing heavy oil was also tested. Perchlorate caused a delay in the onset of sulfate reduction in batch incubations. However, its reduction with oil was not seen in batch culture incubations or bioreactors. Chlorite was more effective at inhibiting SRB activity under these conditions. The research in this thesis thus contributes to improved management of sulfide production in oil fields.
Evaluating the Conceptions of Public Participation in Environmental Assessments in Alberta: How Proponents and Regulators Understand the Practice
Creators: name: Higuerey, Mariel Beatriz
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Geography
subject: Public Participation
subject: Environmental Assessment
subject: Spatiality
subject: Energy
subject: Alberta

description: The use and encouragement of public participation in policy and decision-making, and in environmental and risk assessment, has increased considerably over the past couple of decades. However, there is a lack of consistency in the justification of public participation exercises to stakeholders and sponsors. This research explores the range of variations that exist in the understanding and implementation of public participation in environmental legislation in Alberta, and how those variations affect the evaluation of success. Proponents and regulators were surveyed and interviewed to examine their understanding and perceptions when dealing with public participation under two dimensions – intentionality and geographic framing. It was found that the success of public participation is constructed from both, but the understanding of how each dimension can guide the results is not fully grasped. Public participation is in danger of becoming a tokenistic practice if the tensions arising between these two dimensions are not addressed. The language and practice that surrounds public participation in environmental assessment needs to be redefined before lack of trust and public confidence become further barriers to development.
Termination in a Pi-calculus with Subtyping
Creators: name: Cristescu, Ioana
name: Hirschkoff, Daniel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: We present a type system to guarantee termination of pi-calculus processes that exploits input/output capabilities and subtyping, as originally introduced by Pierce and Sangiorgi, in order to analyse the usage of channels. We show that our system improves over previously existing proposals by accepting more processes as terminating. This increased expressiveness allows us to capture sensible programming idioms. We demonstrate how our system can be extended to handle the encoding of the simply typed lambda-calculus, and discuss questions related to type inference.
In tuition : a case study of UBCO student youth rental housing experiences in the City of Kelowna
Creators: name: McEwan, Jamie Gordon
Publisher: name: University of British Columbia
Year: 2010

description: The purpose of this thesis is to conduct a case study of the University of British Columbia Okanagan’s student youth (ages 18–29) rental housing experiences in the City of Kelowna, British Columbia. Kelowna features high rental costs and low rental vacancy rates. The rental housing problems that Kelowna currently faces have been acknowledged by the Canada Mortgage and Housing Corporation, the local government, and the local media. However, there is a dearth of peer-reviewed literature on student youth rental housing experiences Kelowna. Data were obtained using semi-structured interviews conducted with 10 key informants and 30 student youth currently attending UBCO and living in the City of Kelowna’s rental housing market. The study population for this research includes Canadian-born and internationally-born students, some living on campus and some off. The primary conclusions of this case study are that the student youth respondents face barriers of rental housing unaffordability, unsuitability, and unavailability. The issues of unsuitable rental housing include its quality, locale, roommate problems, and discrimination from landlords. Empirical evidence indicates that the coping strategies used among UBCO student youth in Kelowna include social networking, taking on part-time jobs, and using student loans to pay for housing. There are also a variety of coping strategies recognized as important for this population, but not being currently utilized, including crowding or sharing housing, and living in a state of “hidden homelessness”. Finally, this thesis discusses a variety of potential policy recommendations made by the key informants, including re-assessing funding and cooperation between the private and public sectors, constructing additional purpose-built rental units, creating rental housing services for UBCO student youth, and examining the utilization of secondary suites. This exploratory case study expands on the existing literature by focusing on UBCO’s student youth rental housing experiences in the City of Kelowna. Moreover, this research deals with an understudied topic. The findings from this study suggest that further research must be done on university student youth rental housing experiences in mid-size cities such as Kelowna.
Alpheus estuariensis Christoffersen 1984
Creators: name: Almeida, Alexandre Oliveira De
name: Guerrazzi, Maria Cec Lia
name: Coelho, Petr Ȏ Nio Alves
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Alpheidae
Alpheus
Alpheus estuariensis

description: Alpheus estuariensis Christoffersen, 1984
Material examined (N=1). 1f, 07/VIII/2005, St. 0 5 (MZUESC #655).
Distribution. Florida, Mississippi to Texas, Cuba, Dominican Republic, Trinidad and Tobago, Curaçao, and Brazil (from Ceará to Paraná). Eastern Pacific – Concepción Bay (Gulf of California), Costa Rica, Panama, Málaga Bay (Colombia) (Christoffersen 1984; Martínez-Iglesias et al. 1996).
Ecological notes. Estuarine species inhabiting sandy and muddy bottoms, in burrows, sometimes found among rocks, oysters, and mangrove roots. Intertidal to 22 m (Christoffersen 1984).
Previous records in Bahia. Almeida et al. (2006).
description: Published as part of Almeida, Alexandre Oliveira De, Guerrazzi, Maria Cec Lia & Coelho, Petr Ȏ Nio Alves, 2007, Stomatopod and decapod crustaceans from Camamu Bay, state of Bahia, Brazil, pp. 1-45 in Zootaxa 1553 on page 12, DOI: 10.5281/zenodo.178168
Micrometre-scale refrigerators
Creators: name: Muhonen, Juha T.
name: Meschke, Matthias
name: Pekola, Jukka P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A superconductor with a gap in the density of states or a quantum dot with discrete energy levels is a central building block in realizing an electronic on-chip cooler. They can work as energy filters, allowing only hot quasiparticles to tunnel out from the electrode to be cooled. This principle has been employed experimentally since the early 1990s in investigations and demonstrations of micrometre-scale coolers at sub-kelvin temperatures. In this paper, we review the basic experimental conditions in realizing the coolers and the main practical issues that are known to limit their performance. We give an update of experiments performed on cryogenic micrometre-scale coolers in the past five years.
Innovative Goods Distribution at the Human Scale
Creators: name: Harmer, Alexander
Publisher: name: Environmental Design
Year: 2013
Subjects: subject: Architecture
subject: FOS: Civil engineering
subject: Transportation
subject: Urban and Regional Planning
subject: FOS: Social and economic geography
subject: bicycle
subject: cargo
subject: Design
subject: Urban
subject: service

description: This thesis has initiated an important discussion in the fields of environmental design and, more specifically, of urban goods distribution. Through a variety of design-research based methodologies, it has been shown that the use of a modern breed of cargobikes, with roots in the 19th century, can provide a human-scale goods distribution model with a seamless fit in the urban core. While this new mode of goods distribution may not immediately alter the physical landscape of the urban core, it will add a flash of colour to the kinetic landscape of the city’s street at the human-scale and will provide city-goers, whether on foot or in a vehicle, with a fleeting reprieve from the otherwise predictable surroundings.
Delineating the interplay between subjective safety and country image in influencing international tourists’ extrinsic travel motives
Creators: name: Matiza, Tafadzwa
name: Köchling, Anne
Publisher: name: Journal of Tourism & Development
Year: 2023

description: This paper examines the intervening effect of the subjective safety of travel and tourism activity in the relationship between country image and attribute-based travel motives. Data from an online survey of 454 international tourists were subjected to mediation analyses via Model 4 of Process Macro. The results generally indicate that the effect of country image on travel motives is significantly nuanced by the perceived safety of travel and tourism activity associated with the destination. Intriguingly, in line with the S-O-R model, the perceived safety of travel and tourism activity fully mediates the relationship between a country's functional image and the outdoor-experiential-oriented travel motives of international tourists. Thus, it underscores the practical significance of country image and subjective safety on international tourists' cognition and their subsequent conative behaviour. The findings extend the seminal theory and advance African tourism research to travel motivation during crises. The significant implications for African tourism practitioners and policymakers regarding tourists' travel motives amid a crisis are discussed.
description: Journal of Tourism & Development, vol. 42 (2023)
Drivers and barriers of corporate social responsibility engagement within small, medium and micro hospitality enterprises: The case of the hospitality sector in South Africa
Creators: name: Stevens-King, Nerissa
name: Bello, Felix G.
Publisher: name: Journal of Tourism & Development
Year: 2023

description: Corporate social responsibility (CSR) is a multifaceted concept when considered from a multiple stakeholder perspective. CSR is not a new concept and has evolved into a widely accepted business practise. CSR engagement diers from business to business in terms of organisational context, size, industry and country. This paper explores the drivers and barriers of CSR engagement in the context of small, medium and micro enterprises (SMMEs) in the hospitality sector in South Africa. This study uses the stakeholder theory, to investigate the stakeholders considered by hospitality SMMEs when engaging in CSR activities. Data was collected using purposive and snowballing sample methods where 102 owners and/or managers of hospitality SMMEs completed an online survey. A standard multiple regressions model was used to analysis the data. The results illustrate that hospitality SMMEs positively engage in CSR with the main drive to protect the environment. However, the SMMEs' main barrier are the lack of financial resources to be more responsible. Hospitality SMMEs consider their employees to be a vital stakeholder. This study has practical implications for owners to collaborate with important stakeholders, such as their employees or suppliers, and establish policies that dene CSR practises within their SMME.
description: Journal of Tourism & Development, vol. 42 (2023)
“I have my eyes fixed ahead”: A contribution to the African literary landscape
Creators: name: Baleiro, Rita
name: Coelho-Florent, Adriana
Publisher: name: Journal of Tourism & Development
Year: 2023

description: This exploratory and conceptual paper aims to demonstrate the relevance of literary heritage to enhance the tourist experience and development of the Chão Bom Resistance Museum in Tarrafal (Cape Verde). This study contributes to the construction of the African literary landscape and fills the gap in the research on literary tourism in African destinations. Methodologically, the paper analyses primary and secondary data to identify literary texts and authors associated with the site that can help shape the site's literary landscape and suggest literary tourism products and experiences be implemented at the museum. The study is grounded in literary tourism studies, in the notion that literature can play a significant testimonial and enhancing role in tourism. It reviews the literature on literary tourism in African destinations. The main findings point towards a substantive gap in the literature concerning literary tourism in African countries and a need for cultural promotion of literary tourist destinations aimed at both literary and non-literary tourists.
description: Journal of Tourism & Development, vol. 42 (2023)
Pion-photon transition form factor. Living on the QCD frontier
Creators: name: Stefanis, N. G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: An analysis of all available data (CELLO, CLEO, \babar) in the range $[1÷40]$ GeV$^2$ for the pion-photon transition form factor in terms of light-cone sum rules with next-to-leading-order accuracy is discussed, including twist-four contributions and next-to-next-to-leading order and twist-six corrections---the latter two via uncertainties. The antithetic trend between the \babar data for the $γ^*γπ^0$ and those for the $γ^*γη(η')$ transition is pointed out, emphasizing the underlying antagonistic mechanisms: endpoint enhancement for the first and endpoint-suppression for the second---each associated with pseudoscalar meson distribution amplitudes with distinct endpoint characteristics.
description: 6 pages, 3 figures; needs style files svglov2.clo, svjour2.cls (supplied). Presented at LIGHTCONE 2011, 23 - 27 May, 2011, Dallas, USA. Accepted for publication in Few-Body Systems. In v2 name of second author in [28] corrected. V3 is final version, published online 23. Sep 2011
Educational tourism as a strategy for sustainable tourism development: Perspectives of Windhoek-based universities, Namibia
Creators: name: Tjitunga, Uaarukapo
name: Bama, Hilary Kennedy Nji
name: Makuzva, Washington
Publisher: name: Journal of Tourism & Development
Year: 2023

description: This study explored educational tourism as a strategy for sustainable tourism development, with a specific focus on Windhoek-based universities, Namibia. Based on twenty-three interviews conduc ted with international students and international relations-related staff across the three Windhoek-based universities, this study adopted a qualitative approach in exploring the perceptions of how the universities could leverage their educational tourism (edu-tourism) potential, so as to enhance sustainable tourism development in Namibia. By way of implementing a thematic analysis, the empirical findings suggest that the universities enrolled both long-term degree-seeking and short-term semester-based exchange students. While both categories of students were a potential source of sustainable edu-tourism receipts, no active structures were available for leveraging strategies for attracting such students. Furthermore, the respondents concurred that all three Namibian universities possessed the potential to attract international students to enrol in their programmes, which would contribute to the enhancement of cultural exchange and socio-economic leverages. The study proposes new insights into edu-tourism development in the Namibian context, the need for focused strategies, the development of policies and focused stakeholder engagement for capitalising on this tourism niche. The outcomes present practical leverages prompting Windhoek-based universities to recognise the importance of active participation in edu-tourism promotion, while contributing to the existing literature on the subject, especially in the developing context.
description: Journal of Tourism & Development, vol. 42 (2023)
Temperature-driven evolution of hierarchical nanodomain structure in tetragonal-like BiFeO3 films
Creators: name: Qi, Yajun
name: Chen, Zuhuang
name: Wang, Lihua
name: Han, Xiaodong
name: Wang, Junling
name: Sritharan, Thirumany
name: Chen, Lang
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Transmission electron microscopy study of tetragonal-like BiFeO3 films reveals a hitherto unreported hierarchical nanodomain structure. The 30-50 nm wide stripe domains with {110} domain walls consist of a substructure of lamellar nanodomains of 8-10 nm width in a herringbone-like arrangement. In situ heating and cooling reveals a reversible transition from the hierarchical nanodomain structure to a tweed-like domain structure which is accompanied by a first-order phase transition near 120 °C with a thermal hysteresis.
description: accepted to Applied Physics Letters for publication
Theoretical and Computational Analysis and Comparison of Stochastic Models of Energy and Interest Rate Markets
Creators: name: Bukharina, Tatiana
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Economics--Finance
subject: Mathematics
subject: FOS: Mathematics
subject: Heath-Jarrow-Morton framework
subject: stochastic model
subject: volatility
subject: power forward

description: The present work summarizes information about Interest Rate Market and Energy Market. A mathematical framework is the main aspect considered here. Different kinds of stochastic models are described for both markets. In addition, an introduction is given to a very interesting approach developed by Hinz et al. in 2005. The idea is in an application of interest rate market techniques to the energy market. Comparing this approach to the standard stochastic model we obtain the connection between two different sets of parameters. This significantly extends the possibilities of estimating the crucial parameters of the model. In the final chapter we explore two different ways of using Heath-Jarrow-Morton framework. Firstly, we estimate parameters of the model using a specific form of volatility function and sweet crude oil forward prices. Finally, we examine the general form of volatility function of natural gas forward prices. Then using Principal Component Analysis we obtain the main principal components which allow us to reproduce prices of forward contracts.
Changing ethnic culinary tourists’ behaviour through motivation
Creators: name: Tendani, Edinah
name: Swart, Magdalena Petronella
name: Zyl, Ciné Van
Publisher: name: Journal of Tourism & Development
Year: 2023

description: Traditional cuisine is an important component of a destination's history, identity, and tradition. As culinary tourism enhances the tourist experience, it is necessary to investigate if tourists are motivated to become involved in a destination's gastronomic experience. Motivation drives guests' participation in tourism activities as well as mediates the effect of food involvement on travel. The aim of the study which has not been investigated empirically relates to the literature on Culinary Tourist Motivation (CTM), as the mediator in the relationship between the Culinary Tourist Value Scorecard (CTVSC) and Culinary Tourist Behavioral Involvement (CTBI). Through a questionnaire, 498 responses were collected. The PROCESS-SPSS (V3.0) macro plugin IBM SPSS (V24.0) procedure was used to generate direct and indirect effects in the mediated model. The results revealed that CTM had a full mediating effect between CTVSC and CTBI. Content and face validity of the constructs was ensured through a sound literature foundation, and the study makes a unique contribution by confirming the mediating effect of CTM in the relationship between the CTVSC and CTBI. Destination management organisations can benet from this study's findings as a guideline when developing marketing strategies to motivate visits to culinary attractions.
description: Journal of Tourism & Development, vol. 42 (2023)
Frailty, Cognition, and Depression in Older Subjects with Coronary Artery Disease
Creators: name: Freiheit, Elizabeth Ann
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Epidemiology
subject: Frailty
subject: cardiology
subject: Gerontology
subject: geriatrics
subject: coronary artery disease
subject: cardiac rehabilitation

description: Frailty is an area of increasing interest for researchers in cardiovascular health, as health providers look for ways to improve patient resiliency and outcomes. However, little is known about the behavior of frailty or frailty components, particularly cognitive and emotional vulnerability, over time and which groups are more at risk of decline in resiliency after a coronary intervention. The Calgary Cardiac and Cognition (3C) study is a prospective, longitudinal cohort study of patients undergoing coronary angiography who subsequently received a revascularization procedure or only medical treatment. Using the 3C data, three separate but related studies were completed. First, the independent associations of baseline potential frailty criteria with 12-month decline in activities of daily living (ADL) were compared. Those categorized as frail in the best multivariable model had 9.0 times the risk of ADL decline and 3.8 times the risk of health-related quality of life (HQRL) decline compared to those categorized as robust. In the second study, the association over time between two frailty criteria, depression and cognition, was further investigated. Persistent depressive symptoms were more strongly associated with cognitive decline after coronary intervention than depressive symptoms measured only at baseline. Executive function scores for those with persistent depression in the first year, declined by 0.3 to 0.5 standard deviations in the subsequent 18 months. In the third study, frailty scores on average formed a U-shaped curve with frailty declining from baseline (pre-procedure) to 6 and 12 months, and increasing again by 30 months. Women had higher scores than men, but not significantly so. Frailty trajectory by initial treatment plan differed by age group as those aged 75 and older did not decline (improve) in frailty after the intervention for some treatment types. A better understanding of the nature of frailty and frailty components, provided by this research, may help researchers plan and interpret future intervention studies aimed at preventing worsened frailty or better supporting frail persons in follow up to coronary intervention. It lays the groundwork for more studies designed to better anticipate and address the loss of resilience, functional decline, and quality of life in patients after coronary intervention.
Temperature dependence of the resonance and low energy spin excitations in superconducting FeTe$_{0.6}$Se$_{0.4}$
Creators: name: Harriger, Leland W.
name: Lipscombe, J.
name: Zhang, Chenglin
name: Luo, Huiqian
name: Wang, Meng
name: Marty, Karol
name: Lumsden, M. D.
name: Dai, Pengcheng
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We use inelastic neutron scattering to study the temperature dependence of the low-energy spin excitations in single crystals of superconducting FeTe$_{0.6}$Se$_{0.4}$ ($T_c=14$ K). In the low-temperature superconducting state, the imaginary part of the dynamic susceptibility at the electron and hole Fermi surfaces nesting wave vector $Q=(0.5,0.5)$, $χ^{\prime\prime}(Q,ω)$, has a small spin gap, a two-dimensional neutron spin resonance above the spin gap, and increases linearly with increasing $\hbarω$ for energies above the resonance. While the intensity of the resonance decreases like an order parameter with increasing temperature and disappears at temperature slightly above $T_c$, the energy of the mode is weakly temperature dependent and vanishes concurrently above $T_c$. This suggests that in spite of its similarities with the resonance in electron-doped superconducting BaFe$_{2-x}$(Co,Ni)$_x$As$_2$, the mode in FeTe$_{0.6}$Se$_{0.4}$ is not directly associated with the superconducting electronic gap.
description: 7 pages, 6 figures
Putting money together: How tourism stokvels can improve living standards in South Africa
Creators: name: Seoe, Nonhlanhla Tshabalala
name: Swart, Magdalena Petronella
Publisher: name: Journal of Tourism & Development
Year: 2023

description: The Stokvel system is a leading strategy for poverty alleviation in South Africa. It has the potential to transform the tourism industry and provide much-needed funding to small, medium and micro tourism enterprises. Following the COVID-19 pandemic, investment is slow in the tourism industry, and therefore stokvels are investigated as an alternative source of financing `by the people for the people'. Tourism stokvel investment is postulated as an alternative form of investment for tourism transformation through employment opportunities and poverty reduction efforts in destinations. Therefore, this paper aims to investigate how the dimensions of tourism stokvel social entrepreneurship significantly mediate the relationship between dimensions of tourism stokvel investment and dimensions of tourism social transformation. Quantitative data were collected from 201 respondents across SA using a self-administered online questionnaire. Through structural equation modelling the results of the mediation analysis controlling for Opportunity, Social Capital, Economic Development and Improved Living Standards indicated the existence of two mediation models. Opportunities exist for tourism investors and stokvel members to support small, medium and micro tourism enterprises through social capital and to stimulate economic development to improve the living standards of South Africans.
description: Journal of Tourism & Development, vol. 42 (2023)
title: Geographische Räume, neu konstruiert
title: Zur Konstruktion, Kuratierung und Analyse digitaler Geographien
titleType: AlternativeTitle
Creators: name: Westerholt, René
Publisher: name: TU Dortmund
Year: 2023
Subjects: subject: Digitale Geographie
subject: Raum
subject: Digitalisierung
subject: Wissensordnungen
subject: 710

description: Die als technosozialer Prozess verstandene Digitalisierung beeinflusst nahezu alle Bereiche der Gesellschaft. Die damit im Zusammenhang stehenden Entwicklungen verlaufen in der Regel langsam und über längere Zeiträume, weshalb entsprechende Veränderungen oft erst im Nachhinein deutlich werden. Noch weniger offensichtlich sind die Auswirkungen der digitalen Technologien auf das Konzept des geographischen Raums, das, verstanden als eine Reihe von sozial konstruierten Beziehungen zwischen auf der Erdoberfläche befindlichen Einheiten, bereits für sich genommen abstrakt ist. Dennoch unterliegt der geographische Raum als Konzept derzeit einem tiefgreifenden Wandel. Digitale Technologien können Geographien ermöglichen oder behindern, ihre Gestaltung und Wahrnehmung beeinflussen oder Handlungen auslösen, die eine räumliche Manifestation haben. Dieses Kapitel bietet eine Diskussion geographischer Wissensordnungen, die sich unter dem Einfluss der Digitalisierung zu verändern scheinen. Eine Einführung in die technologischen und soziokulturellen Aspekte des Einflusses digitaler Prozesse auf geographische Räume liefert zunächst die Grundlagen für die zu diskutierenden Veränderungsprozesse. Darauf aufbauend werden verschiedene digital-geographische Raumvorstellungen aus der Humangeographie vorgestellt, da diese die Kontexte bilden, in denen digital beeinflusste geographische Informationen entstehen. Letztere bilden die Grundlage für Wissen. Daher werden verschiedene prototypische Formen geographischer Information kurz vorgestellt. Die anschließende Diskussion der sich wandelnden geographischen Wissensordnungen zeigt, dass die Digitalisierung zu einer Mischform des Wissens über geographische Sachverhalte führt: Einerseits gibt es digital geprägtes lokales Erfahrungswissen (aus erster Hand), das andererseits auch Merkmale von formalisiertem propositionalem Wissen aufweist. Darüber hinaus wird in diesem Kapitel argumentiert, dass trotz gegenteiliger Prognosen, insbesondere aus den 1990er Jahren, die Geographie als organisierendes Strukturelement für Wissen an Bedeutung gewinnt, und zwar nicht in traditioneller Weise in Bezug auf Länder oder Regionen, sondern in unregelmäßiger und hyperlokaler Weise über Orte, die sowohl digital als auch physisch präsent sind.
description: Veröffentlichungen des Instituts für Europäische Geschichte Mainz / Supplement;141
description: Ein Europa der Differenzen;Band 4
Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system
Creators: name: Sanchis-Ojeda, Roberto
name: Winn, Joshua N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present the analysis of 4 months of Kepler photometry of the K4V star HAT-P-11, including 26 transits of its "super-Neptune" planet. The transit data exhibit numerous anomalies that we interpret as passages of the planet over dark starspots. These spot-crossing anomalies preferentially occur at two specific phases of the transit. These phases can be understood as the intersection points between the transit chord and the active latitudes of the host star, where starspots are most abundant. Based on the measured characteristics of spot-crossing anomalies, and previous observations of the Rossiter-McLaughlin effect, we find two solutions for the stellar obliquity (psi) and active latitude (l): either psi = 106 and l = 19.7, or psi = 97 and l = 67 (all in degrees). If the active latitude changes with time in analogy with the "butterfly diagram" of the Sun's activity cycle, future observations should reveal changes in the preferred phases of spot-crossing anomalies.
description: ApJ, in press [9 pages]
Cavity-Induced Synthetic Gauge Potentials
Creators: name: Mivehvar, Farokh
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Condensed Matter
subject: ultracold atoms
subject: gauge potentials
subject: gauge fields
subject: Bose-Einstein condensation
subject: cavity QED
subject: atom-photon interaction

description: Abelian and non-Abelian gauge potentials and quantum gauge theories play central roles in our understanding of Nature. Gauge potentials are also of great significance in condensed matter physics. In fact, minimal coupling of electrons to an Abelian or non-Abelian gauge potential is the essential ingredient for the realization of topological states of matter. Due to the high controllability of ultracold atoms, they are commonly exploited to test fundamental theories of physics, simulate intractable systems, and realize exotic many-body states. Nonetheless, the charge neutrality of atoms places severe constraints on ultracold atomic systems, since neutral particles do not couple to gauge potentials the way charged particles do. That said, coupling a multi-component quantum gas to laser light can lead to the emergence of artificial Abelian and non-Abelian gauge potentials minimally coupled to the center-of-mass momenta of ultracold neutral atoms, paving the way for realizing topological states of matter and simulating gauge theories in quantum gases. All previous proposals for inducing gauge potentials have been developed in the semiclassical regime, where the radiation field is treated classically. I have developed a two-photon Raman scheme in the strong atom-photon coupling (i.e., quantum) regime, based on two counter-propagating modes of a ring cavity, to induce both synthetic magnetic field and spin-orbit coupling for a single neutral atom inside the cavity. The spin-orbit interaction is only weakly dependent on the occupation of the cavity modes, whereas the strength of the magnetic field is proportional to the square of the total number of photons in the cavity and can be made arbitrarily large, which is desirable for realizing the quantum Hall phase. I have then extended this single-atom cavity quantum-electrodynamics scheme to many bosons in the weak atom-photon coupling regime. In addition to inducing spin-orbit coupling for the individual atoms, the cavity fields also mediate infinite-ranged interactions between atoms, whose strengths and signs can readily be tuned experimentally. The interplay between these cavity-mediated interactions and the intrinsic two-body interactions determines the many-body ground state and its elementary excitations, with novel consequences such as the stabilization of an attractive Bose-Einstein condensate which otherwise is unstable.
Students’ Perception Towards Tourism Entrepreneurship Education and Entrepreneurial Desirability in South Africa
Creators: name: Ntshangase, Sibusiso D.
name: Ezeuduji, Ikechukwu
Publisher: name: Journal of Tourism & Development
Year: 2023

description: This paper explored students' perception towards the effectiveness of tourism entrepreneurship education in developing entrepreneurial attributes and achieving entrepreneurial desirability. A structured questionnaire was used to collect data from 154 randomly selected tourism students at a South African comprehensive University. Descriptive, bivariate, and multivariate data analyses were employed to address the research objectives. The study found that having entrepreneurship education and entrepreneurial family background played a role in achieving entrepreneurial attributes and desirability. Students' demographic characteristics (gender and age group) did not play a role in the achievement of entrepreneurial attributes and desirability. Nonetheless, the study recommended ways to improve the quality of entrepreneurship education being offered in the university's tourism department that was studied.
description: Journal of Tourism & Development, vol. 42 (2023)
Tourism competitiveness in Cape Verde: the case of Tarrafal/Santiago
Creators: name: Sarmento, Eduardo Moraes
name: Monteiro, José Luís Mascarenhas
Publisher: name: Journal of Tourism & Development
Year: 2023

description: The study of competitiveness has been constantly gaining importance in recent decades. Cape Verde Government elected Tarrafal as a development hub of tourism competitiveness. Since the empirical validation of competitiveness Cape Verde is still shortfall, so the current research aims to analyze the determinants of competitive advantage of tourism in Tarrafal. To achieve this goal, it was adopted a qualitative methodology based on a sample of the major key players in the tourism area and the creation of four working groups during Tarrafal Technical Days (1 and 2 July 2022) to better discuss these issues. The discussion of the final conclusions from each working group, allowed to systematize some major development alternatives to Tarrafal as a strategic tourism hub. Major implications for managers were also presented, such as the importance to develop and reinforce cultural traditions, reinforce entrepreneurship in order to maximize the tourism chain value through the implementation of better infrastructures (better roads, a maritime port as well as an aerodrome), diversify the tourist offer based on different segments (culture, nature, sports, events, remote working among others) and benefit other regions and municipalities around the county.
description: Journal of Tourism & Development, vol. 42 (2023)
The influence of User Generated Content on Johannesburg Hotels, South Africa
Creators: name: Rogerson, Jayne M.
name: Giddy, Julia K.
name: Ngwenya, Nomsa P.
Publisher: name: Journal of Tourism & Development
Year: 2023

description: The significance of online User Generated Content (UGC) has been increasing rapidly around the world, influencing travellers' decision-making when planning trips, as well as businesses' online reputations. Prior to the COVID-19 pandemic, in South Africa, there has been a significant growth in the accommodation sector, particularly in Johannesburg, due to the development of various tourism subsectors throughout the city. Little research has been conducted which examines the influence of UGC on hotels and almost none in South Africa. Therefore, this study provides a contribution towards local literature and further understanding of how travellers rate and view the services of hotels, using Johannesburg hotels as a case study. The study was conducted through the use of a desktop analysis of travellers' ratings and reviews of 147 three to five star hotels in Johannesburg as listed on the TripAdvisor platform. The findings highlight the profile of these hotels as well as a broad overview of visitor perceptions of hotels within Johannesburg. They then provide an analysis of reviews for each hotel which gives insight into the perceptions of visitors of a variety of hotels. This analysis offers an important perspective into the satisfaction of tourists staying at Johannesburg hotels.
description: Journal of Tourism & Development, vol. 42 (2023)
Effect of E-marketing on the Brand Image of Hotels in Cape Coast, Ghana
Creators: name: Siaw, Gladys Apreh
name: Martey, Edward Markwei
name: Danquah, Bright
Publisher: name: Journal of Tourism & Development
Year: 2023

description: Marketing in the tourism and hospitality industry is gradually shifting from the conventional way to a more digitised regime. This became even more conspicuous during the outbreak of the COVID-19 pandemic. Among other things, e-marketing contributes to the brand of hotels and expands their market base. Nonetheless, hotels in the Cape Coast Metropolis appear to be making less out of the opportunities presented by e-marketing activities; possibly due to limited empirical evidence on how e-marketing influences the brand image of hotels. This study, thus, examined the perceived effect of e-marketing on the brand image of hotels in Cape Coast, Ghana. A convenience sampling procedure was employed to include 142 customers in the study. Data were obtained with the aid of well-structured questionnaires and analysed with descriptive and inferential statistical tools such as frequencies, percentages, and regression models. The result of the descriptive analysis showed that emails, SMS, websites and Facebook are perceived as effective marketing and promotional tools. Moreover, results of the regression analysis revealed that emails, SMS, Facebook and website have significantly positive effects on brand image. It was concluded that improved e-marketing activities are drivers of enhanced hotel brand image. It was recommended that the Ghana Hotels Association should put policies in place to encourage hotel managers and owners to focus on making their e-marketing activities and platforms more attractive to improve the brand image of their hotels.
description: Journal of Tourism & Development, vol. 42 (2023)
Stakeholder perceptions of the potentials for rural tourism development around Hluhluwe iMfolozi Park in South Africa
Creators: name: Mgabhi, Nelisile Z.
name: Ezeuduji, Ikechukwu O.
Publisher: name: Journal of Tourism & Development
Year: 2023

description: This study aimed to assess the potentials of rural tourism development in the communities surrounding Hluhluwe iMfolozi Park (HiP), in KwaZulu-Natal, South Africa. It adopted a qualitative research method based on the explorative and interpretive paradigms. Interview guides were used to conduct semi-structured interviews with the participants. Twenty (20) semi-structured interviews with HiP management staff and owners/managers of tourism businesses within this area were conducted. The study used content analysis to analyse the data collected. SWOT analysis was performed to determine whether HiP and surrounding communities have potentials for rural tourism development. The study revealed lots of strengths and opportunities, which could serve as platform for rural tourism development, however the management of weaknesses and threats is essential for success. It was noted that the development of human resources would be required for the successful development of rural tourism in this area. Emphasis was also made on the area's infrastructural development, which is an important physical resource for any tourism development. The study recommends leadership commitment in driving the process of rural tourism development through capacity building.
description: Journal of Tourism & Development, vol. 42 (2023)
Stakeholder reflections on the relaunching of the post-COVID-19 sport event tourism industry in South Africa
Creators: name: Daniels, Tracy
name: Tichaawa, Tembi M.
Publisher: name: Journal of Tourism & Development
Year: 2023

description: The current paper examines stakeholder reflections on the post COVID-19 sport event tourism subsector in South Africa. The paper is premised on the impact of the COVID-19 pandemic on the sport events tourism sub-sector, characterised by large-scale cancellations of sport events and restrictions on movement of people. Grounded by the sport tourism framework and the stakeholder theory, the main objective of the paper was to present stakeholder insights on the relaunching of the post COVID-19 sport event tourism subsector using South Africa as a case study. Fourteen in depth interviews were conducted with key informants involved in the sport event tourism subsector. The empirical findings show that the subsector experienced significant negative impacts but that stakeholders are engaged in several innovative activities including cross-sector collaboration, efforts to reignite demand and contemporary marketing initiatives making use of new technologies in efforts to counter the negative effects of the pandemic and to ensure future sport event tourism resilience and sustainability. The study makes a significant contribution to existing literature by articulating emerging trends in the sport tourism as the sector post-Covid-19 pandemic. In addition, it provides insights which ensure the future resilience of the subsector and its use as a tool for economic, societal and urban development.
description: Journal of Tourism & Development, vol. 42 (2023)