Visitors' expenditure behaviour at cultural events: The case of Christmas markets.

This paper examines the determinants of visitors' expenditure behaviour at cultural events. The authors analyse visitors' expenditure at the micro-level, dividing it into expenditure on accommodation and expenditure on food and beverages. The explicative variables taken into account are socio-demographic, economic, psychological and trip-related attributes. An ad hoc survey was conducted on the three most famous Christmas markets in the north of Italy in December 2008 and 2009. To achieve their aims, the authors use the robust double-hurdle model. The results indicate that travel purpose, region of origin, perception of the event, length of stay and age are significant factors influencing both the propensity to spend and the amount of money actually spent during visits. The findings will provide destination managers and tourism businesses with practical knowledge useful for destination marketing, event development and customer service

Teachers’ Education and Outcomes: Mapping the Research Terrain

Background/Context: Questions about teacher quality, including how teachers ought to be educated and licensed, rank near the top of the educational agenda in the United States. These controversies persist because of lack of consensus about what “teacher quality” means, conflicting claims about the empirical evidence, and public skepticism about the need for formal teacher preparation. Because there has been relatively little research on the outcomes of preparation programs and pathways and because researchers work from diverging paradigms, there are few clear conclusions in this area. Purpose/Objective/Research Question/Focus of Study: The purpose of this article is to offer a conceptual analysis of empirical research on teachers’ education and outcomes that is linked to the political controversies and policy debates that shape it. Using the concept of research “genres,” the article addresses two questions: (1) How have researchers conceptualized and studied the connections between teachers’ education and its outcomes, consequences, or results? (2) What are the policy controversies and larger social and political factors that have shaped these genres? Research Design:This review focuses on research conducted in the United States since 1998 and published by peer-reviewed journals or centers with peer review procedures. The review includes only empirical research that explicitly examines connections between particular aspects of teachers’ education (e.g., certification status, academic background, pathways into teaching, program mission/curriculum, transitions to teaching, life experiences) and specific posteducation outcomes (e.g., teacher preparedness, beliefs, practice, retention, student achievement). Findings/Results: The review reveals that there are six distinguishable genres that examine connections between teachers’ education and posteducation outcomes: teacher certification and its correlates, teachers’ educational backgrounds and the teacher workforce, entry pathways into teaching and their consequences, teacher preparation programs and their graduates, teacher preparation and learning to teach in the early career years, and teachers’ life experiences and beliefs/practices. The article analyzes and critiques each genre, including its contributions/limitations and the controversies it addresses. Conclusions/Recommendations: The review concludes that there continue to be relatively few studies that connect aspects of teachers’ education to outcomes; some genres focus primarily on outcomes related to student achievement, whereas others focus primarily on outcomes related to teacher learning. These genres have grown up relatively separately from one another. The review recommends that all six research genres ought to be taken into account by policymakers, researchers, and practitioners in order to have a rich understandings of teachers’ education and outcomes

Evidence for He I 10830 \AA~ absorption during the transit of a warm Neptune around the M-dwarf GJ 3470 with the Habitable-zone Planet Finder

Understanding the dynamics and kinematics of out-flowing atmospheres of hot and warm exoplanets is crucial to understanding the origins and evolutionary history of the exoplanets near the evaporation desert. Recently, ground based measurements of the meta-stable Helium atom's resonant absorption at 10830 \AA~has become a powerful probe of the base environment which is driving the outflow of exoplanet atmospheres. We report evidence for the He I 10830 \AA~in absorption (equivalent width $\sim$ $0.012 \pm 0.002$ \AA) in the exosphere of a warm Neptune orbiting the M-dwarf GJ 3470, during three transits using the Habitable Zone Planet Finder (HPF) near infrared spectrograph. This marks the first reported evidence for He I 10830 \AA\, atmospheric absorption for a planet orbiting an M-dwarf. Our detected absorption is broad and its blueshifted wing extends to -36 km/sec, the largest reported in the literature to date. We modelled the state of Helium atoms in the exosphere of GJ3470b based on assumptions on the UV and X-ray flux of GJ 3470, and found our measurement of flux-weighted column density of meta-stable state Helium $(N_{He^2_3S} = 2.4 \times 10^{10} \mathrm{cm^{-2}})$, derived from our transit observations, to be consistent with model, within its uncertainties. The methodology developed here will be useful to study and constrain the atmospheric outflow models of other exoplanets like GJ 3470b which are near the edge of the evaporation desert.Comment: Accepted in Ap

Higher depletion of lithium in planet host stars: no age and mass effect

Recent observational work by Israelian et al. has shown that sun-like planet host stars in the temperature range 5700K < Teff < 5850K have lithium abundances that are significantly lower than those observed for "single" field stars. In this letter we use stellar evolutionary models to show that differences in stellar mass and age are not responsible for the observed correlation. This result, along with the finding of Israelian et al., strongly suggest that the observed lithium difference is likely linked to some process related to the formation and evolution of planetary systems.Comment: 4 pages, 4 figures, letter accepted for publication in Astronomy & Astrophysic

Persistent starspot signals on M dwarfs: multi-wavelength Doppler observations with the Habitable-zone Planet Finder and Keck/HIRES

Young, rapidly-rotating M dwarfs exhibit prominent starspots, which create quasiperiodic signals in their photometric and Doppler spectroscopic measurements. The periodic Doppler signals can mimic radial velocity (RV) changes expected from orbiting exoplanets. Exoplanets can be distinguished from activity-induced false positives by the chromaticity and long-term incoherence of starspot signals, but these qualities are poorly constrained for fully-convective M stars. Coherent photometric starspot signals on M dwarfs may persist for hundreds of rotations, and the wavelength dependence of starspot RV signals may not be consistent between stars due to differences in their magnetic fields and active regions. We obtained precise multi-wavelength RVs of four rapidly-rotating M dwarfs (AD Leo, G 227-22, GJ 1245B, GJ 3959) using the near-infrared (NIR) Habitable-zone Planet Finder, and the optical Keck/HIRES spectrometer. Our RVs are complemented by photometry from Kepler, TESS, and the Las Cumbres Observatory (LCO) network of telescopes. We found that all four stars exhibit large spot-induced Doppler signals at their rotation periods, and investigated the longevity and optical-to-NIR chromaticity for these signals. The phase curves remain coherent much longer than is typical for Sunlike stars. Their chromaticity varies, and one star (GJ 3959) exhibits optical and NIR RV modulation consistent in both phase and amplitude. In general, though, we find that the NIR amplitudes are lower than their optical counterparts. We conclude that starspot modulation for rapidly-rotating M stars frequently remains coherent for hundreds of stellar rotations, and gives rise to Doppler signals that, due to this coherence, may be mistaken for exoplanets.Comment: Accepted for publication in the Astrophysical Journa

The Epoch of Giant Planet Migration Planet Search Program. I. Near-Infrared Radial Velocity Jitter of Young Sun-like Stars

We present early results from the Epoch of Giant Planet Migration program, a precise RV survey of over one hundred intermediate-age ($\sim$20$-$200 Myr) G and K dwarfs with the Habitable-Zone Planet Finder spectrograph (HPF) at McDonald Observatory's Hobby-Eberly Telescope (HET). The goals of this program are to determine the timescale and dominant physical mechanism of giant planet migration interior to the water ice line of Sun-like stars. Here, we summarize results from the first 14 months of this program, with a focus on our custom RV pipeline for HPF, a measurement of the intrinsic near-infrared RV activity of young Solar analogs, and modeling the underlying population-level distribution of stellar jitter. We demonstrate on-sky stability at the sub-2 m s$^{-1}$ level for the K2 standard HD 3765 using a least-squares matching method to extract precise RVs. Based on a subsample of 29 stars with at least three RV measurements from our program, we find a median RMS level of 34 m s$^{-1}$. This is nearly a factor of 2 lower than the median RMS level in the optical of 60 m s$^{-1}$ for a comparison sample with similar ages and spectral types as our targets. The observed near-infrared jitter measurements for this subsample are well reproduced with a log-normal parent distribution with $\mu=4.15$ and $\sigma=1.02$. Finally, by compiling RMS values from previous planet search programs, we show that near-infrared jitter for G and K dwarfs generally decays with age in a similar fashion to optical wavelengths, albeit with a shallower slope and lower overall values for ages $\lesssim$1 Gyr

The Strayed Reveller, No. 7

The seventh issue of The Strayed Reveller.https://scholarworks.sfasu.edu/reveller/1006/thumbnail.jp

Teachers’ Education and Outcomes: Mapping the Research Terrain

Background/Context: Questions about teacher quality, including how teachers ought to be educated and licensed, rank near the top of the educational agenda in the United States. These controversies persist because of lack of consensus about what “teacher quality” means, conflicting claims about the empirical evidence, and public skepticism about the need for formal teacher preparation. Because there has been relatively little research on the outcomes of preparation programs and pathways and because researchers work from diverging paradigms, there are few clear conclusions in this area. Purpose/Objective/Research Question/Focus of Study: The purpose of this article is to offer a conceptual analysis of empirical research on teachers’ education and outcomes that is linked to the political controversies and policy debates that shape it. Using the concept of research “genres,” the article addresses two questions: (1) How have researchers conceptualized and studied the connections between teachers’ education and its outcomes, consequences, or results? (2) What are the policy controversies and larger social and political factors that have shaped these genres? Research Design:This review focuses on research conducted in the United States since 1998 and published by peer-reviewed journals or centers with peer review procedures. The review includes only empirical research that explicitly examines connections between particular aspects of teachers’ education (e.g., certification status, academic background, pathways into teaching, program mission/curriculum, transitions to teaching, life experiences) and specific posteducation outcomes (e.g., teacher preparedness, beliefs, practice, retention, student achievement). Findings/Results: The review reveals that there are six distinguishable genres that examine connections between teachers’ education and posteducation outcomes: teacher certification and its correlates, teachers’ educational backgrounds and the teacher workforce, entry pathways into teaching and their consequences, teacher preparation programs and their graduates, teacher preparation and learning to teach in the early career years, and teachers’ life experiences and beliefs/practices. The article analyzes and critiques each genre, including its contributions/limitations and the controversies it addresses. Conclusions/Recommendations: The review concludes that there continue to be relatively few studies that connect aspects of teachers’ education to outcomes; some genres focus primarily on outcomes related to student achievement, whereas others focus primarily on outcomes related to teacher learning. These genres have grown up relatively separately from one another. The review recommends that all six research genres ought to be taken into account by policymakers, researchers, and practitioners in order to have a rich understandings of teachers’ education and outcomes

Victimization and substance use disorders in a national sample of heterosexual and sexual minority women and men

There is consensus in the research literature that substance use disparities exist among sexual minority women and men; however, few studies have examined risk factors that may contribute to these disparities.To compare reports of life-time victimization experiences in a US national sample of adult heterosexual and sexual minority women and men and to examine the relationships between victimization experiences and past-year substance use disorders.The secondary data analyses used 2004–05 (wave 2) National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) data collected in structured diagnostic face-to-face interviews in the United States. Substance use disorders (SUDs) were defined according to DSM-IV criteria and included past-year alcohol abuse, alcohol dependence, drug abuse and drug dependence. The sample consisted of 34 653 adults aged 20 years and older; approximately 2% of the respondents self-identified as sexual minority (lesbian, gay or bisexual).Results showed strong associations between victimization and any past-year SUDs and confirmed findings from several previous studies indicating that, compared with heterosexuals, sexual minority women and men are at heightened risk for life-time victimization. However, prevalence of the seven victimization experiences and the degree of association between individual victimization experiences and SUDs varied substantially across sexual minority subgroups. The childhood victimization variables—especially childhood neglect—showed the strongest and most consistent associations with SUDs. Odds of SUDs were generally higher among both female and male respondents, regardless of sexual identity, who reported multiple (two or more) victimization experiences than among those who reported no life-time victimization, suggesting a possible cumulative effect of multiple victimization experiences.Higher rates of life-time victimization, particularly victimization experienced in childhood, may help to explain higher rates of substance use disorders among sexual minorities. However, more research is needed to understand better the complex relationships among sexual orientation, victimization and substance use.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/79096/1/j.1360-0443.2010.03088.x.pd

Soil biochemistry and microbial activity in vineyards under conventional and organic management at Northeast Brazil.

The São Francisco Submedium Valley is located at the Brazilian semiarid region and is an important center for irrigated fruit growing. This region is responsible for 97% of the national exportation of table grapes, including seedless grapes. Based on the fact that orgThe São Francisco Submedium Valley is located at the Brazilian semiarid region and is an important center for irrigated fruit growing. This region is responsible for 97% of the national exportation of table grapes, including seedless grapes. Based on the fact that organic fertilization can improve soil quality, we compared the effects of conventional and organic soil management on microbial activity and mycorrhization of seedless grape crops. We measured glomerospores number, most probable number (MPN) of propagules, richness of arbuscular mycorrhizal fungi (AMF) species, AMF root colonization, EE-BRSP production, carbon microbial biomass (C-MB), microbial respiration, fluorescein diacetate hydrolytic activity (FDA) and metabolic coefficient (qCO2). The organic management led to an increase in all variables with the exception of EE-BRSP and qCO2. Mycorrhizal colonization increased from 4.7% in conventional crops to 15.9% in organic crops. Spore number ranged from 4.1 to 12.4 per 50 g-1 soil in both management systems. The most probable number of AMF propagules increased from 79 cm-3 soil in the conventional system to 110 cm-3 soil in the organic system. Microbial carbon, CO2 emission, and FDA activity were increased by 100 to 200% in the organic crop. Thirteen species of AMF were identified, the majority in the organic cultivation system. Acaulospora excavata, Entrophospora infrequens, Glomus sp.3 and Scutellospora sp. were found only in the organically managed crop. S. gregaria was found only in the conventional crop. Organically managed vineyards increased mycorrhization and general soil microbial activity