Miracle-dz/UniFAR-FTUs huggingface dataset:
The Effect of Airbnb on Hotel Performance: Comparing Single- and Multi-Unit Host Listings in the United States

Extant research provides ample evidence that Airbnb has an adverse impact on hotel revenues and that a majority of Airbnb hosts offer multiple listings on the platform. Arguably, multi-unit host listings are the primary driving force for the associated decreases in hotel revenues. To test this proposition, this study examines the extent to which single- and multi-unit host Airbnb host listings have differing effects on hotel revenues. The results show that the adverse impact of Airbnb supply on hotel revenues was mainly driven by decreases in hotel prices rather than decreases in hotel demand. Contrary to expectations, single-unit host listings exerted greater downward pricing pressure on hotels than multi-unit host listings. These effects were consistently observed across hotel segments, with economy-scale hotels experiencing substitution effects in addition to pricing pressure. The findings have significant implications for researchers and stakeholders impacted by the sharing economy in the lodging industry.
Determination of light scattering coefficient of dark and heavy sheets

Les proprietes mecaniques des papiers dependent des liaisons inter-fibres. La mesure du coefficient de dispersion de la lumiere est utile pour evaluer l'etat de ces liaisons, mais ne peut habituellement s'appliquer aux feuilles trop epaisses ou opaques. On presente une methode non destructive applicable a ces derniers cas, qui combine les mesures de transmission et reflectivite avec la theorie de Kubelka-Munk
An Explanatory Model of Problematic Internet Use of Southern Spanish University Students

The problematic Internet use (PIU) has become a topic of special relevance since it is a problem that affects the whole world. It has been detected that the population at greatest risk is university students along with adolescents. At the same time, Spain is one of the countries with the highest PIU rate. The purposes of this article were to analyze the presence and degree of Internet addiction among university students and to check the sociodemographic factors that influence the PIU. To this end, 13 hypotheses were put forward and contrasted using a structural equation model. The study adopted a cross-sectional approach by applying the Internet addiction test to a sample of undergraduate students in southern Spain (n = 1,013). The results indicated a prevalence of PIU among students of almost 12.5% and with a moderate degree of addiction. In turn, the following hypotheses that had a significant effect on the PIU were supported: gender; field of knowledge; living in the parents’ home; Internet daily use for leisure; Internet daily use for academic purposes; number of social networks; sexual orientation; marital status. Finally, the main findings of the study were reviewed, and the main recommendations and implications for mitigating the negative effects of technology and enhancing the positive ones were established.
Merging the Sol–Gel Technique with the Pulsed Microplasma Cluster Source Deposition to Improve Control over the Memristive Response of TiO2 Thin Films

Metal oxide thin films show promising resistive switching properties, making them materials of reference for the development of memristive devices. TiO2 is probably one of the most studied materials and is being synthesized using various techniques, each of them having specific optimizable characteristics. In this paper, we report on an innovative approach by combining the sol–gel and the pulsed microplasma cluster source (PMCS) methods, exploiting the low temperature and low cost of the former process and precise control over nanocristallinity of the latter. We show that this approach overcomes the reported limitations that each technique shows in fabricating memristive devices when independently used. A side-by-side comparison of the TiO2 thin films produced by the PMCS, sol–gel, and PMCS/sol–gel hybrid methods (HM) demonstrates an improvement of the memristive properties and a reduction of the electrical shorts in the TiO2 based devices.
Nitrogen application rate, timing and history effects on nitrous oxide emissions from corn (Zea mays L.)

Roy, A. K. , Wagner-Riddle, C. , Deen, B. , Lauzon, J. and Bruulsema, T. 2014. Nitrogen application rate, timing and history effects on nitrous oxide emissions from corn (Zea mays L.). Can. J. Soil Sci. 94: 563-573. Nitrous oxide (N2O) emissions resulting from application of nitrogen (N) fertilizer contribute to the greenhouse gas footprint of corn production. In eastern Canada, corn is a major crop with most N fertilizer applied pre- or at planting. This timing of application results in a lack of synchrony of soil N supply and crop N demand. Matching the amount and timing of application to crop uptake has been suggested as a mitigation measure to reduce N losses, and is an integral part of the 4R Nutrient Stewardship program. This study examined the effect of timing, rate and history of urea-ammonium nitrate application on N2O emissions in corn in 2011 and 2012 at Elora, ON, Canada. Treatments were three N rates (30, 145 and 218 kg N ha-1); two timings (N injected in mid-row at planting and at the 8th leaf stage, V8); two histories (short-term: applying N rate treatments on plots that had received 145 kg N ha-1 in the previous year, and long-term: applying the same N rate to a given plot over the duration of the trial). N2O emissions were measured using static chambers. History of N application did not have an effect on N2O emissions or grain yield. In both years, cumulative N2O emissions during the growing season and corn yields increased significantly with increasing N application rates. In 2011, cumulative N2O emissions were significantly lower when N was applied as side-dress at V8 (0.88 kg N ha-1) compared with planting (2.12 kg N ha-1), with no significant impact on corn grain yield (average 9.1 Mg ha-1). In contrast, in 2012, limited rainfall reduced both N2O emissions and corn grain yield, and neither N2O emission (average 0.17 kg N ha-1) nor grain yield (average 6.7 Mg ha-1) was affected by timing of N application. Applying N as side-dress at V8 instead of at planting and using the recommended N rate were shown to be effective N2O emission mitigation practices without affecting corn yield during a typical wet spring in Ontario.
Multidimensional Analysis of Diversity in DH Lines and Hybrids of Winter Oilseed Rape (Brassica napus L.)

Limited genetic variability is a major problem in rapeseed breeding, whose strict selection, limited geographical range and a short period of domestication has led to a reduction in genetic and phenotypic diversity. Assessing specific populations for the greatest genetic diversity for many traits simultaneously, requires the evaluation of multi-feature characteristics. The aim of this study was to estimate the variability of DH (doubled haploid) lines and two generations of winter oilseed rape hybrids. In addition, the relationship between the Mahalanobis distances of parental forms and the effect of heterosis in hybrids was investigated. The results of MANOVA showed that the genotypes and years as well as genotype × year interaction were significantly different (p < 0.001) for all eight observed traits. The first (V1) and the second (V2) canonical variate explained 38.57% and 27.55% of the total variation in 2015, and 50.19% and 31.84% in 2016, respectively Canonical variate analysis showed that the traits, flowering time and number of branches per plant had a very large influence on the differentiation of genotypes. Graphs demonstrated that the tested DH lines and hybrids are characterized by a similar, wide range of variability. It was observed, that when using a diverse population of DH lines for crossbreeding with only one CMS/Rfo line, there was no significant reduction of variation in hybrid generations and between these generations. The phenotypic distance values determined by the results of Mahalanobis analysis were similar in both years, but slightly wider in 2016. The observed minimum and maximum ranged from 1.324 to 22.356 in 2015, and from 1.105 to 27.792 in 2016, respectively. No significant correlation was observed between the hybrid heterosis effect and the Mahalanobis distance of the parental lines.
Effect of bed diameter on bubble growth and incipient slugging in gas fluidised beds

Mise en place d'un modele mathematique tenant compte des facteurs du titre pour la performance du lit fluidise. Mise en place d'un critere de pistonnage ou l'effet bouchon naissant depend a la fois de la hauteur du lit et de la region contrairement au critere, de Stewart et Davidson qui ne tient pas compte de la hauteur du lit. Les resultats fournis par le modele sont compares avec les donnees experimentales de la litterature
Mindfulness-based Virtual Reality Intervention in Hemodialysis Patients: A Pilot Study on End-user Perceptions and Safety.

Background Virtual reality (VR) is an evolving technology that is becoming a common treatment for pain management and psychologic phobias. Although nonimmersive devices (e.g., the Nintendo Wii) have been previously tested with patients on hemodialysis, no studies to date have used fully immersive VR as a tool for intervention delivery. This pilot trial tests the initial safety, acceptability, and utility of VR during maintenance hemodialysis treatment sessions-particularly, whether VR triggers motion sickness that mimics or negatively effects treatment-related symptoms (e.g., nausea). Methods Patients on hemodialysis (n=20) were enrolled in a phase 1 single-arm proof-of-concept trial. While undergoing hemodialysis, participants were exposed to our new Joviality VR program. This 25-minute program delivers mindfulness training and guided meditation using the Oculus Rift head-mounted display. Participants experienced the program on two separate occasions. Before and immediately after exposure, participants recorded motion-related symptoms and related discomfort on the Simulator Sickness Questionnaire. Utility measures included the end-user's ability to be fully immersed in the virtual space, interact with virtual objects, find hardware user friendly, and easily navigate the Joviality program with the System Usability Scale. Results Mean age was 55.3 (±13.1) years; 80% male; 60% Black; and mean dialysis vintage was 3.56 (±3.75) years. At the first session, there were significant decreases in treatment and/or motion-related symptoms after VR exposure (22.6 versus 11.2; P=0.03); scores >20 indicate problematic immersion. Hemodialysis end-users reported high levels of immersion in the VR environment and rated the software easy to operate, with average System Usability Scale scores of 82.8 out of 100. Conclusions Patients on hemodialysis routinely suffer from fatigue, nausea, lightheadedness, and headaches that often manifest during their dialysis sessions. Our Joviality VR program decreased symptom severity without adverse effects. VR programs may be a safe platform to improve the experience of patients on dialysis.
Short-Term Exuberance and Long-Term Stability: A Simultaneous Optimization of Stock Return Predictions for Short and Long Horizons

The fundamental interest of investors in econometric modeling for excess stock returns usually focuses either on short- or long-term predictions to individually reduce the investment risk. In this paper, we present a new and simple model that contemporaneously accounts for short- and long-term predictions. By combining the different horizons, we exploit the lower long-term variance to further reduce the short-term variance, which is susceptible to speculative exuberance. As a consequence, the long-term pension-saver avoids an over-conservative portfolio with implied potential upside reductions given their optimal risk appetite. Different combinations of short and long horizons as well as definitions of excess returns, for example, concerning the traditional short-term interest rate but also the inflation, are easily accommodated in our model.
How entrepreneur’s leadership behavior and demographics shape applicant attraction to new ventures: the role of stereotypes

Abstract Given the challenges of new ventures to attract applicants, this paper focuses on the influence of applicants’ perceptions of entrepreneurs for new venture recruitment. Based on role congruity theory, we propose that organizational attractiveness increases when entrepreneurs show entrepreneurial leadership, which fits the new venture context, and that this effect is mediated by perceived authenticity. Moreover, we propose this effect is particularly pertinent when entrepreneurs are young and male and thus fit the prevailing demographic stereotype of entrepreneurs. In our experiment (n = 503), we found the positive effect of showing entrepreneurial leadership on organizational attractiveness via authenticity perceptions, and this effect was stronger if the entrepreneur was young – the entrepreneur’s gender did not moderate the relationship. We discuss the implications of our study for research and practice in recruitment and entrepreneurship.
Burial-Deformation History of Folded Rocks Unraveled by Fracture Analysis, Stylolite Paleopiezometry and Vein Cement Geochemistry: A Case Study in the Cingoli Anticline (Umbria-Marche, Northern Apennines)

Unravelling the burial-deformation history of sedimentary rocks is prerequisite information to understand the regional tectonic, sedimentary, thermal, and fluid-flow evolution of foreland basins. We use a combination of microstructural analysis, stylolites paleopiezometry, and paleofluid geochemistry to reconstruct the burial-deformation history of the Meso-Cenozoic carbonate sequence of the Cingoli Anticline (Northern Apennines, central Italy). Four major sets of mesostructures were linked to the regional deformation sequence: (i) pre-folding foreland flexure/forebulge; (ii) fold-scale layer-parallel shortening under a N045 σ1; (iii) syn-folding curvature of which the variable trend between the north and the south of the anticline is consistent with the arcuate shape of the anticline; (iv) the late stage of fold tightening. The maximum depth experienced by the strata prior to contraction, up to 1850 m, was quantified by sedimentary stylolite paleopiezometry and projected on the reconstructed burial curve to assess the timing of the contraction. As isotope geochemistry points towards fluid precipitation at thermal equilibrium, the carbonate clumped isotope thermometry (Δ47) considered for each fracture set yields the absolute timing of the development and exhumation of the Cingoli Anticline: layer-parallel shortening occurred from ~6.3 to 5.8 Ma, followed by fold growth that lasted from ~5.8 to 3.9 Ma.
Towards a biomechanical understanding of implant stability using functional bioimaging and computational modeling

Primary implant stability following screw insertion is an important prerequisite for successful surgical fracture treatment and for long-term osseointegration of permanent implants. In patients with good bone stock, sufficient implant fixation is usually possible. However, in osteoporotic bone with compromised density and material properties, screw loosening is a major problem. Yet, it is exactly this group of the osteoporotic patients that most often requires surgical fixation of fragility fractures. This article presents an overview on several aspects of primary implant stability. For this purpose, a list of those factors that are relevant for screw fixation is presented. In addition, non-invasive, clinically applicable, techniques to assess implant stability are discussed, followed by a review on invasive methods to measure primary implant stability in a laboratory setting. It is concluded that despite a large body of research, the orthopedic community is still lacking a holistic understanding of primary implant stability. In order to improve conventional implants and surgical procedures for use in osteoporotic bone, more in-depth knowledge is required about the mechanisms involved in implant stability. The combination of mechanical testing with high-resolution computed tomography appears to be a promising tool to obtain the experimental data required to get more localized insight into primary implant stability and to characterize the basic failure mechanisms at the level of the peri-implant bone microstructure. Such knowledge is believed to be important for the development of implants that are specifically tailored for the weak bone tissues of osteoporosis patients.
The presence of rainbow trout reduces drift of aquatic insects in Yungas streams (Tucumán, Argentina)

The drift or transport of individuals downstream is an important phenomenon of rivers and streams, since most aquatic organisms participate in it at some period of their life cycle. This work describes the assemblage of macroinvertebrate drift from ten sites in eight mountain streams of Tucumán, and evaluates the effect of the presence of rainbow trout (Oncorhynchus mykiss Walbaum), an exotic fish and visual predator, on this fraction of the community. Thirty-one (31) families of drifting aquatic invertebrates were identified, mainly immature insects and to a lesser extent water mites (Acari: Hydrachnidia), oligochaetes (Annelida: Oligochaeta) and nematodes (Nematoda). The richness and diversity of the sites with trout did not differ from the others, except when comparing lower and upper reaches of a same stream. Samples from rivers without trout or with low density of trout did not show significant changes in drift density of macroinvertebrates. In contrast, in rivers with high trout densities, a notable decrease in insect taxa was observed (those with large sized individuals): Baetidae (Ephemeroptera), Gripopterygidae (Plecoptera) and Leptoceridae (Trichoptera). On the contrary, the density of small Diptera, water mites, oligochets and nematodes increased in trout-streams. www.biotaxa. org/RSEA. ISSN 1851-7471 (online) Revista de la Sociedad Entomológica Argentina 80(1): 74-80, 2021 Copyright SERRA GREPPI, I.C. & MOLINERI, C. This is an open access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0) 74
High efficient removal of lead(II) and nickel(II) from aqueous solution by novel polysulfone/Fe3O4–talc nanocomposite mixed matrix membrane

AbstractNovel mixed matrix membranes were prepared from polysulfone (PSf), talc and Fe3O4–talc nanocomposite by phase inversion technique. PSf/Fe3O4–talc membranes showed higher lead and nickel rejections compared to PSf/talc membranes, which reaches to 99.4 and 96.2% for lead and nickel ions, respectively, at feed pH 5 and lower rejections at pH 3.5 and 2. Higher surface area in Fe3O4–talc nanocomposite than talc could be considered as a main reason of higher heavy metals removal in PSf/Fe3O4–talc membranes. The heavy metals removal enhances with the increase in nanocomposite content from 7 to 9 wt. % because higher numbers of vacant sites in membrane morphology were available for adsorption. Heavy metals rejection reduces in higher nanocomposite concentrations (11 and 13 wt.%) due to the formation of macrovoids in membrane substructure. In addition, a reduction in the metal ion rejection was recognized by enhancement in feed solution concentration and applied pressure. This is caused by difficulty for th.
Methane dynamics in three different Siberian water bodies under winter and summer conditions

Abstract. Arctic regions and their water bodies are affected by a rapidly warming climate. Arctic lakes and small ponds are known to act as an important source of atmospheric methane. However, not much is known about other types of water bodies in permafrost regions, which include major rivers and coastal bays as a transition type between freshwater and marine environments. We monitored dissolved methane concentrations in three different water bodies (Lena River, Tiksi Bay, and Lake Golzovoye, Siberia, Russia) over a period of 2 years. Sampling was carried out under ice cover (April) and in open water (July–August). The methane oxidation (MOX) rate and the fractional turnover rate ( k′ ) in water and melted ice samples from the late winter of 2017 was determined with the radiotracer method. In the Lena River winter methane concentrations were a quarter of the summer concentrations (8 nmol L −1 vs. 31 nmol L −1 ), and mean winter MOX rate was low (0.023 nmol L −1 d −1 ). In contrast, Tiksi Bay winter methane concentrations were 10 times higher than in summer (103 nmol L −1 vs. 13 nmol L −1 ). Winter MOX rates showed a median of 0.305 nmol L −1 d −1 . In Lake Golzovoye, median methane concentrations in winter were 40 times higher than in summer (1957 nmol L −1 vs. 49 nmol L −1 ). However, MOX was much higher in the lake (2.95 nmol L −1 d −1 ) than in either the river or bay. The temperature had a strong influence on the MOX ( Q 10 = 2.72 ± 0.69 ). In summer water temperatures ranged from 7–14 ∘ C and in winter from −0.7 to 1.3 ∘ C. In the ice cores a median methane concentration of 9 nM was observed, with no gradient between the ice surface and the bottom layer at the ice–water interface. MOX in the (melted) ice cores was mostly below the detection limit. Comparing methane concentrations in the ice with the underlaying water column revealed methane concentration in the water column 100–1000 times higher. The winter situation seemed to favor a methane accumulation under ice, especially in the lake with a stagnant water body. While on the other hand, in the Lena River with its flowing water, no methane accumulation under ice was observed. In a changing, warming Arctic, a shorter ice cover period is predicted. With respect to our study this would imply a shortened time for methane to accumulate below the ice and a shorter time for the less efficient winter MOX. Especially for lakes, an extended time of ice-free conditions could reduce the methane flux from the Arctic water bodies.
Determinants of indebtedness of Brazilian companies listed in B3 with and without insolvency risk

Purpose – The objective of this paper is to identify and analyze if there are differences in the determinants of the capital structure of companies listed in B3 (Brazil, Stock exchange, Over-The-Counter), with and without risk bankruptcy. Design/methodology/approach – We used the bankruptcy prediction index (Z2) of Altman, Baidya and Dias (1979) to separate companies with and without risk of bankruptcy, in addition to the multiple regression model estimated by OLS, in a sample consisting of 233 companies. The data used are secondary, of annual periodicity, obtained from financial statements taken from the Quantum Axis database, covering the period from 2011 to 2016. Findings – We concluded that there is a difference in the determinants of indebtedness between companies with and without risk of bankruptcy. Companies with risk of bankruptcy present a positive relationship between long-term and total indebtedness, and profitability and risk. Healthy companies, long-term and total debt presented negative relation with profitability, and positive with risk and size. Research limitations/implications – The limitation of this study is that it applies only to the companies investigated, so it is not possible to make generalizations. Originality/value – As a whole, the evidence found corroborates the pecking order hypothesis, according to which the first source of funds to finance investments is retained earnings, in the assessment of the capital structure of healthy companies than in relation to companies at risk of bankruptcy. Thus, the research's contribution is in the empirical field, providing new evidence for a very controversial topic in finance theory.