How Important is being Liked ? The Relation between Facebook Use and Well-being

Facebook is used by approximately 1.06 billion(Craig,2013) to keep in touch with family and friends. However, the question remains whether Facebook is helpful or harmful to people’s well being. According to a research study conducted by Gonzales and Hancock (2010), Facebook use enhances self-esteem by providing multiple opportunities for selective self-presentation through photos and personal details. Another research study by Twenge, Freeman and Campbell (2012) found that participants who spent time on social network sites endorsed more positive self-views. While some research indicates that Facebook has a positive effect on the user other studies suggest that Facebook use is detrimental. A study conducted by Tazghini and Siedlecki (2013) found a negative association between self-esteem and Facebook activity. This association was related to actions like untagging “undesirable” pictures or adding others as friends who they are not familiar with. Similarly, Sheppard Pratt’s (2012) research indicated that Facebook has a negative impact on self-esteem and body image . “Facebook is making it easier for people to spend more time and energy criticizing their own bodies and wishing they looked like someone else” (Dr. Harry Brandt, director of The Center for Eating Disorders at Sheppard Pratt). Given the discrepancies in the research, a worthwhile next step involves examining personal characteristics that may influence the relationship between Facebook use and well-being. The present research will examine whether certain factors influence the relationship between Facebook use and overall well-being.https://scholarscompass.vcu.edu/uresposters/1033/thumbnail.jp

Bad Teachers

Not every class can be a cakewalk. From three-hour labs to brutal exams, there are a number of factors that can take a class from an “easy A” to a nightmare in no time. But sometimes, the class matters less than who’s teaching it. We asked Iowa State students to tell us about some of their worst experiences with instructors—with any luck, your MWF 8 a.m. won’t seem so bad in comparison

Field measurement of the fate of atmospheric H₂ in a forest environment : from canopy to soil

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2013.Cataloged from PDF version of thesis.Includes bibliographical references (p. 245-254).Atmospheric hydrogen (H₂ ), an indirect greenhouse gas, plays a notable role in the chemistry of the atmosphere and ozone layer. Current anthropogenic emissions of H₂ are substantial and may increase with its widespread use as a fuel. The H₂ budget is dominated by the microbe-mediated soil sink, and although its significance has long been recognized, our understanding is limited by the low temporal and spatial resolution of traditional field measurements. This thesis was designed to improve the process-based understanding of the H₂ soil sink with targeted field and lab measurements. In the field, ecosystem-scale flux measurements of atmospheric H₂ were made both above and below the forest canopy for over a year using a custom, automated instrument at the Harvard Forest. H₂ fluxes were derived using a flux-gradient technique from the H₂ concentration gradient and the turbulent eddy coefficient. A ten-fold improvement in precision was attained over traditional systems, which was critical for quantifying the whole ecosystem flux from small H2 concentration gradients above the turbulent forest canopy. Soil uptake of atmospheric H₂ was the dominant process in this forest ecosystem. Rates peaked in the summer and persisted at reduced levels in the winter season, even across a 70 cm snowpack. We present correlations of the H₂ flux with environmental variables (e.g., soil temperature and moisture). This work is the most comprehensive attempt to elucidate the processes controlling biosphere-atmosphere exchange of H₂ . Our results will help reduce uncertainty in the present-day H₂ budget and improve projections of the response of the H₂ soil sink to global change. In the lab, we isolated microbial strains of the genus Streptomyces from Harvard Forest and found that the genetic potential for atmospheric H₂ uptake predicted H₂ consumption activity. Furthermore, two soil Actinobacteria were found to utilize H₂ only during specific lifecycle stages. The lifecycle of soil microorganisms can be quite complex as an adaptation to variable environmental conditions. Our results indicate that H₂ may be an important energetic supplement to soil microorganisms under stress. These results add to the understanding of the connections between the environment, organismal life cycle, and soil H₂ uptake.by Laura Kelsey Meredith.Ph.D

Ecosystem fluxes of hydrogen: a comparison of flux-gradient methods

Our understanding of biosphere–atmosphere exchange has been considerably enhanced by eddy covariance measurements. However, there remain many trace gases, such as molecular hydrogen (H[subscript 2]), that lack suitable analytical methods to measure their fluxes by eddy covariance. In such cases, flux-gradient methods can be used to calculate ecosystem-scale fluxes from vertical concentration gradients. The budget of atmospheric H[subscript 2] is poorly constrained by the limited available observations, and thus the ability to quantify and characterize the sources and sinks of H[subscript 2] by flux-gradient methods in various ecosystems is important. We developed an approach to make nonintrusive, automated measurements of ecosystem-scale H2 fluxes both above and below the forest canopy at the Harvard Forest in Petersham, Massachusetts, for over a year. We used three flux-gradient methods to calculate the fluxes: two similarity methods that do not rely on a micrometeorological determination of the eddy diffusivity, K, based on (1) trace gases or (2) sensible heat, and one flux-gradient method that (3) parameterizes K. We quantitatively assessed the flux-gradient methods using CO[subscript 2] and H[subscript 2]O by comparison to their simultaneous independent flux measurements via eddy covariance and soil chambers. All three flux-gradient methods performed well in certain locations, seasons, and times of day, and the best methods were trace gas similarity for above the canopy and K parameterization below it. Sensible heat similarity required several independent measurements, and the results were more variable, in part because those data were only available in the winter, when heat fluxes and temperature gradients were small and difficult to measure. Biases were often observed between flux-gradient methods and the independent flux measurements, and there was at least a 26% difference in nocturnal eddy-derived net ecosystem exchange (NEE) and chamber measurements. H[subscript 2] fluxes calculated in a summer period agreed within their uncertainty and pointed to soil uptake as the main driver of H[subscript 2] exchange at Harvard Forest, with H[subscript 2] deposition velocities ranging from 0.04 to 0.10 cm s[superscript −1].National Science Foundation (U.S.) (NSF Graduate Research Fellowship)United States. National Aeronautics and Space Administration (Advanced Global Atmospheric Gases Experiment (AGAGE))Massachusetts Institute of Technology. Joint Program on the Science & Policy of Global ChangeMartin Family Society of Fellows for SustainabilityMassachusetts Institute of Technology (Ally of Nature Research Fund)Massachusetts Institute of Technology (William Otis Crosby Lectureship)Massachusetts Institute of Technology (Warren Klein Fund

Confirmatory Factor Analysis of Sizing Me Up: Validation of an Obesity-Specific Health-Related Quality of Life Measure in Latino Youth

No Abstract

Measuring rural community resilience: case studies in New Zealand and Vermont, USA

To date, methods for assessing community resilience have focused predominantly on disaster recovery. Those that do focus on broader social-ecological and psychological contexts tend to be qualitative and have not been validated at the community scale. This situation reveals a need for quantitative measurement tools for assessing community resilience to slow-moving change such as rural depopulation or climate change. Our research provides a proof of concept across two diverse contexts, New Zealand and Vermont, USA, that community resilience can be quantified and broken down into dimensions of resilience. Using mixed methods, we assessed how eight communities across two countries perceive resilience and compared their perceptions with indicators of resilience in the form of official statistics. Vermonters generally perceived their communities as more resilient than did New Zealanders, and reported different dimensions of resilience as drivers of overall perceptions of resilience. Although institutional resilience was a driver of overall resilience in both countries, social and cultural dimensions of resilience were also drivers in New Zealand, whereas economic and environmental dimensions were drivers of overall resilience in Vermont. Resilience indicators were found to be weakly related or unrelated to community perceptions of resilience. This result suggests that the proposed method for measuring resilience can be used across contexts, but that there is not one type of resilience that is the key to higher levels of overall resilience. It also suggests that the two proxy measures of resilience, i.e., community perceptions and indicators, do not provide a consistent picture of resilience, raising the question of which is a more accurate measure

Recruitment and reach in a school-based pediatric obesity intervention trial in rural areas

Introduction: The purpose of this study is to evaluate two recruitment strategies on schools and participant participation rates and representativeness (reach) within a pediatric obesity treatment trial tailored for families who live in rural areas. Methods: Recruitment of schools was evaluated based on their progress toward enrolling participants. Recruitment and reach of participants were evaluated using (1) participation rates and (2) representativeness of demographics and weight status of participants compared to eligible participants (who did not consent and enroll) and all students (regardless of eligibility). School recruitment, as well as participant recruitment and reach, were evaluated across recruitment methods comparing opt-in (i.e., caregivers agreed to allow their child to be screened for eligibility) vs. screen-first (i.e., all children screened for eligibility). Results: Of the 395 schools contacted, 34 schools (8.6%) expressed initial interest; of these, 27 (79%) proceeded to recruit participants, and 18 (53%) ultimately participated in the program. Of schools who initiated recruitment, 75% of schools using the opt-in method and 60% of schools using the screen-first method continued participation and were able to recruit a sufficient number of participants. The average participation rate (number of enrolled individuals divided by those who were eligible) from all 18 schools was 21.6%. This percentage was higher in schools using the screen-first method (average of 29.7%) compared to schools using the opt-in method (13.5%). Study participants were representative of the student population based on sex (female), race (White), and eligibility for free and reduced-price lunch. Study participants had higher body mass index (BMI) metrics (BMI, BMIz, and BMI%) than eligible non-participants. Conclusions: Schools using the opt-in recruitment were more likely to enroll at least 5 families and administer the intervention. However, the participation rate was higher in screen-first schools. The overall study sample was representative of the school demographics

The variability of methane, nitrous oxide and sulfur hexafluoride in Northeast India

High-frequency atmospheric measurements of methane (CH[subscript 4]), nitrous oxide (N[subscript 2]O) and sulfur hexafluoride (SF[subscript 6]) from Darjeeling, India are presented from December 2011 (CH[subscript 4])/March 2012 (N[subscript 2]O and SF[subscript 6]) through February 2013. These measurements were made on a gas chromatograph equipped with a flame ionization detector and electron capture detector, and were calibrated on the Tohoku University, the Scripps Institution of Oceanography (SIO)-98 and SIO-2005 scales for CH[subscript 4], N[subscript 2]O and SF[subscript 6], respectively. The observations show large variability and frequent pollution events in CH[subscript 4] and N[subscript 2]O mole fractions, suggesting significant sources in the regions sampled by Darjeeling throughout the year. By contrast, SF[subscript 6] mole fractions show little variability and only occasional pollution episodes, likely due to weak sources in the region. Simulations using the Numerical Atmospheric dispersion Modelling Environment (NAME) particle dispersion model suggest that many of the enhancements in the three gases result from the transport of pollutants from the densely populated Indo-Gangetic Plains of India to Darjeeling. The meteorology of the region varies considerably throughout the year from Himalayan flows in the winter to the strong south Asian summer monsoon. The model is consistent in simulating a diurnal cycle in CH[subscript 4] and N[subscript 2]O mole fractions that is present during the winter but absent in the summer and suggests that the signals measured at Darjeeling are dominated by large-scale (~100 km) flows rather than local (<10 km) flows.Massachusetts Institute of Technology. Center for Global Change Science (Director's Fund)Massachusetts Institute of Technology. Joint Program on the Science & Policy of Global ChangeMartin Family Society of Fellows for SustainabilityMIT Energy InitiativeMIT International Science and Technology InitiativeUnited States. National Aeronautics and Space Administration (Grant NNX11AF17G)United States. National Oceanic and Atmospheric Administration (Contract RA133R09CN0062