2923 research outputs found
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Diamonds in the Rough
No full texthttps://digitalcommons.latech.edu/quatrain-gallery-volume-5/1017/thumbnail.jp
Praying Mantis: The One-Night Stand
No full texthttps://digitalcommons.latech.edu/quatrain-gallery-volume-5-cropped/1015/thumbnail.jp
The Divine Feminine
No full texthttps://digitalcommons.latech.edu/quatrain-gallery-volume-5-cropped/1000/thumbnail.jp
Effects of Transformational Leadership on Safety Performance in the United States Commercial Trucking Industry
Get PDFThe purpose of this study was to research whether the leadership styles of safety professionals, supervisory and management leaders of commercial trucking companies, were related to their companies’ safety ratings. The theoretical framework employed in this study was based on the full range leadership model of Avolio and Bass (1991). Sixty-two long-haul commercial truck drivers participated in the study. This quantitative research was a quasi-experimental, correlational study comparing leadership styles with safety indices of trucking companies. The leadership styles were determined using the 45-question Multifactor Leadership Questionnaire (MLQ) Rater Form (Avolio & Bass, 1991) and compared them to the safety indices of the participants’ trucking companies. The safety indices had two components, the companies’ safety ratings and their safety climate scores. The safety ratings were derived from the U.S. Department of Transportation Federal Motor Carrier Safety Administration’s Safety Measurement System (SMS) database. The safety climate score was a content-validated 10-question Likert-scale survey derived from the Nordic Occupational Safety Climate Questionnaire (NOSACQ-50). Sixty-two truck drivers completed the MLQ Rater Forms and Safety Climate Scales. The study found that transformational leadership was negatively correlated to safety climates, and passive avoidant leadership had positive correlations to safety climates. These unexpected outcomes may be explained by the predisposition of long-haul truck drivers to share proactive, introverted personality types. These types respond better to the autonomy and self-reliance that passive avoidant leaders provide than that of transformational leaders. Future employee selection, training, and professional development may benefit from testing for leadership and personality types. These processes may then be utilized to improve the safety outcomes of trucking companies and other remote workforces
Relationship Between Calcium Consumption from Dairy and Non-Dairy Sources on Bone Mineral Density of College Students
Get PDFDairy product consumption has been on the decline for decades in the US and worldwide, and the increase in plant-based substitutes has grown substantially. Osteoporosis and the risk of bone fractures are serious public health issues. To date, little scientific-based studies have compared the relationship between calcium intake from dairy sources vs non-dairy sources and bone mineral density. The purpose of this study is to compare the relationships between calcium consumption from dairy vs. non-dairy sources and bone mineral density among college students. There was a total of 66 participants in the study including 15 (23%) males and 51 (77%) females. The participants’ ages ranged from 17 to 43 years with 48 (74%) being white, 16 (25%) African American, and 1 (1%) Hispanic. There was a significant difference found between males (M =.00, SD = .00) and females (M =.62, SD = 1.21) for z-scores, t(37), p \u3c.01. There was a significant difference found between males (M = 126.27, SD = 22.44) and females (M = 110.21, SD = 21.55) for stiffness index scores, t(60), p \u3c 02. There was a significant difference found between whites (M = 109.60, SD = 20.67) and non-whites (M = 129.27, SD = 22.86) in stiffness index scores t(58), p \u3c .01. There was a significant difference in dairy calcium intake between participants who did not meet the RDA (M = 293.43, SD = 249.36) and participants who did meet the RDA (M = 940.98, SD = 618.89) t(15.54), p \u3c .01. This study confirmed that not only were participants who didn’t consume dairy calcium not meeting the RDA, but they weren’t making up for the difference in non-dairy sources
The Effects of Increased NaCl Salinization on Riparian Plant Productivity and Decomposition Processes
Get PDFNaCl salinization in inland ecosystems is increasing globally due to anthropogenic activity and may alter organism abundances and ecosystem processes. Because sodium is an essential nutrient for heterotrophs but not required by autotrophs, this salinization can alter species abundance and performance. Riparia may be particularly sensitive to increases in salinization. Here, I examined the Sodium Subsidy-Stress Hypothesis, which states that deviations from an organism’s optimal nutrient target can decrease abundance and performance, by studying the effects of NaCl salinization on plant chemistry, productivity, and decomposition rates in riparia. First, I selected three focal common riparian plants (water oak: Quercus nigra, cottonwood: Populus deltoides, and kale: Brassica sp.) to test the prediction that riparian plants will uptake and store sodium in their tissues. Plants received either 300ml low-level (0.05%) NaCl solution or just H2O weekly. After three months, plants watered with NaCl solutions were ~2-3 times more enriched in sodium than controls but had no effects on productivity. The sodium-enriched plant tissues (leaves and stems) were then used to test the prediction that sodium-enriched plant tissues will decompose faster in riparia. These plant tissues along with artificial substrates (100% cellulose sponges either enriched in 0.05% NaCl or just H2O) were placed in three and five inland riparia respectively in Texas and Louisiana. However, decomposition rates did not differ between sodium-enriched and control treated plant and artificial tissues for any species or tissue type at any of the locations. Lastly, I tested the impacts of a gradient of NaCl addition on plant biochemistry and productivity in a common woody riparian species (water oak: Q. nigra). Oaks were watered with 0%, 0.05%, 0.1%, and 0.4% NaCl water solutions. After three months I found that oaks watered with higher NaCl solutions had higher tissues sodium concentrations and reduced leaf biomass and stem growth. Increases in NaCl salinization can lead to alterations in plant biochemistry as well as decreases in plant species abundances and productivity. Similar decomposition rates in sodiumenriched and non-enriched leaf litter suggest that either detrital communities in southcentral United States may not be sodium-limited or detrital committees are not sensitive to differences in leaf litter sodium concentrations. Riparia are seeing increases in global salinization, which can alter dead organic matter quality and quantity
Hello, I am Megan Gremillion
No full textMegan Gremillion is a junior biology major. The title of her project is: The Impact of Teacher Fidelity on the Effectiveness of WISE and Early Childhood Health Outcomes