Remembering Rosewood

Drawing from traditions of memorialization and eulogy, this paper attempts to remember the violence of Rosewood, FL. The author combines investigative research, photodocumentary, and her own analysis of roadside memorials in North Central Florida to describe personal and historical accounts of Rosewood

The effects of cooperative learning on student attitude and achievement in a Middle School science classroom

The purpose of this project was to test the hypothesis that student enthusiasm, participation, and comprehension would increase when using cooperative learning techniques in a classroom context

Black-Scholes Model: an Analysis of the Influence of Volatility

In this thesis the influence of volatility in the Black-Scholes model is analyzed. The deduced Black-Scholes formula estimates the price of European options. Contrary to the other parameters of the formula, the future volatility of the underlying asset cannot be observed in the market. The parameter needs to be assumed in order to calculate the option price. An inaccurate assumption may lead to an erroneous volatility. It is studied how a falsely assumed volatility impacts on the option price. Empirical simulations will be carried out to get an impression of possible errors in the computations. Afterwards, those results will be discussed and linked with an evaluation of potential risks

Knowledge Transformation: A Case For Workforce Diversity

This paper provides a theoretical framework for studying the role of knowledge transformation processes in leveraging the diversity of top management teams to improve firm performance.  Previous research on the effect of workforce diversity on firm performance recognizes the importance of relevant contextual factors, yet few studies examine the value of processes that enable a management team diverse in personal attributes to transform their knowledge into strategic decisions. Drawing on the resource-based view, the knowledge transformation process is argued to be a dynamic capability that enables firms to leverage differences in opinions, perspectives, and problem-solving abilities when making strategic decisions.  This paper yields insight into both the translation process and its relationship to strategic performance

Studies on the suitability of Jatropha curcas kernel meal as an alternative protein source in diets for carp (Cyprinus carpio) and tilapia (Oreochromis niloticus)

Aquaculture production is increasing annualy and wild fisheries for fishmeal production remain stagnant. As a consequence, extensive research has been deployed to reduce dietary fishmeal inclusion in feeds of farmed species. Usage of alternative protein sources derived from plants continues to increase with the most popular sources being oilseeds, legumes and cereal grains. The downside of these sources is that most of them could directly be used for human consumption arising legitimate criticism from voices referring to countries where protein shortages lead to malnutrition among the population. Jatropha curcas is a tropical oilseed with upcoming popularity for sustainable fuel sourcing. The plant is thought to thrive in semi-arid and arid areas, not just producing oil, but at the same time reclaiming previously eroded land for the local population. For these reasons, annual cultivation of Jatropha curcas is thought to rise over the next decades. After oil is extracted from the seed, the remaining press cake, is currently used as a fertilizer or energy source. This is mostly due to toxic phorbol esters that until recent- ly limited any nutritional applications. In 2011, a method to detoxify Jatropha press cake was developed and paved the way for nutritional research on the resulting detoxified Jatropha curcas kernel meal (JKM) to be launched. JKM offers very high protein content with a balanced amino acid composition suggesting opportunities for usage as a feedstuff in aquaculture diets. JKM further has higher mineral content than comparable oilseeds. However, potential anti-nutritional factors (ANFs) present in the meal could lead to impairment of nutrient availability or other adverse effects. Previous research has already started to evaluate JKM as a protein source for a variety of aquaculture species. This thesis attempts to further identify the potential of JKM as a protein source and assess the effects of JKM on the development of two model cultured teleost species, common carp (Cyprinus carpio) and Nile tilapia (Oreochromis niloticus), as they represent two of the most farmed species, particularly in the tropics. The work comprises growth trials on both species using fishmeal as a subject of replacement in solely fishmeal protein-based diets and on more practical fishmeal/plant protein-based diets. It engages with the effects of phytate, a prominent component of JKM with potential anti-nutritional attributes and commercially available phytase feed supplements to diminish these attributes, as well as oxalate, another plant-specific component with high concentrations in JKM and with limited attention in aquaculture nutrition research. Carp and tilapia showed varying results with different inclusion levels of JKM. For carp 50% fishmeal replacement was possible without losses in growth in diets where fishmeal was the only bulk protein source (Chapter 3.1), Tilapia showed slightly worse growth at a 30% replacement level (Chapter 3.2). A steep decline in growth could be observed when replacing 100% fishmeal with JKM in carp (Chapter 3.1), while tilapia showed no difference at that level compared to 30% replacement (Chapter 3.2). In practical diets, 100% of fishmeal could be replaced by JKM without any adverse effects on growth of carp (Chapter 3.3), while tilapia showed a slight, but significant linear negative correlation with higher inclusion levels of JKM (Chapter 3.4). Phytase addition in tilapia feeds was identified as having no obvious impact on growth in JKM based diets where enough available phosphorus was provided through mineral supplementation (Chapter 4.1). In JKM based diets where available phosphate was not added, phytase addition showed a tendency to increase growth and significantly increased mineral retention and decreased phosphorus effluent contamination (Chapter 4.2). Phytase application through pre-incubating JKM along with citric acid exerted a positive effect of growth on carp when fishmeal protein was replaced by 50% (Chapter 3.1). Phytase was further shown to completely hydrolyze phytate in vitro; however, incomplete hydrolysis was observed in vivo in tilapia (Chapter 4.3). Dietary soluble oxalate added to fishmeal based diets for carp showed better growth parameters, nutrient and mineral retention at inclusion levels 1.5% and higher (Chapter 5.1). For tilapia, a trial could demonstrate adverse effects of oxalate on potassium, calcium, manganese and zinc digestibilities, in this case without negative effects on growth (Chapter 5.2). For both, carp and tilapia, an impact of oxalate on lipid metabolism was evident, lowering body lipid content and blood cholesterol in inclusion levels from 1.5% or higher. JKM can become a valuable alternative to present dietary protein sources in aquaculture feeds. The nutritional attributes of JKM need further research, especially longer-term testing in a commercial scenario and application in commercially produced feeds. Results of this thesis pose a useful addition to previous research and can be referred to for realizing these next steps

Design, fabrication and test of a 4750 Newton-meter-second double Gimbal control moment gyroscope

The development of a prototype Control Moment Gyroscope (CMG) is discussed. Physical characteristics and the results of functional testing are presented to demonstrate the level of system performance obtained. Particular attention is given to how the man-rated mission requirement influenced the choice of the materials, fabrication, and design details employed. Comparisons are made of the measured system responses against the prediction generated by computer simulation

Da li oksalati iz hrane za ribe biljnog porekla ometaju rast šarana, cyprinus carpio?

Jedan od najvažnijih izazova održivog razvoja u akvakulturi je održivo obezbeđenje hrane, koje zahteva upotrebu manje konvencionalnih sastojaka za hranu za ribe kao što su presovane pogače i uljarice. Neke od ovih sirovina imaju visok sadržaj oksalata, koji su poznati kao antinutricioni faktor za neke domaće životinje. Oksalat je proizvod metabolizma biljaka, ali se takođe pojavljuje u metabolizmu životinja. Zavisno od vrste biljaka oksalati se nakuplja: kao rastvorljiva so vezana za natrijum, kalijum ili amonijum; kao nerastvorljiva so vezana sa dvovalentnim jonima kalcijuma, magnezijuma ili gvožđa; i kao kombinacija oba navedena sliučaja. Negativni efekti oksalata kod sisara uključuju smanjenje raspoloživosti minerala iz hrane što izaziva njihov nedostatak, zatim formiranje kamenčića oksalata kalcijuma ili magnezijuma u bubregu i drugim tkivima, što rezultira artritisom ili simptomima gihta. Za nepreživare preporučen je maksimalni sadržaj od 0.5% u hrani. Hrana za ribe koja sadrži lišće, presovane pogače ili proizvode od pirinča može lako da dostigne ili pređe navedeni sadržaj oksalata, međutim, koliko je nama poznato, ova problematika nije do sada nikada bila ispitivana. Da bi se ispitali efekti na ribe, šarani (Cyprinus carpio) su hranjeni hranom koja sadrži oksalate u količinama od 0%, 0.5%, 1.5% i 2.5% tokom 8 nedelja. Sva hrana je bila redovno konzumirana, a preživljavanje riba je bilo 100%. Prirast ribe koja je hranjena hranama koje su sadržale oksalate je bio bolji nego u kontroli (0%), sa značajnim razlikama između tretmana 1.5% i 2.5% (p ≤ 0.05, Tab.1). Isto je važilo i za vrednosti SGR, MGR i PER (Tab.2). FCR je bio značajno niži za tretmane 1.5% i 2.5% u odnosu na kontrolu, dok u slučaju tretmana 0.5% to nije bio slučaj. PPV je bio viši za tretmane 1.5% i 2.5% u odnosu na tretmane sa nižim sadržajem oksalata. LPV je bio značajno viši u kontroli u odnosu na hrane sa 1.5% i 2.5% oksalata, dok za vrednosti EPV nije bilo razlike. Utvrđene su statistički značajne razlike u telesnom hemijskom sastavu eksperimentalnih riba: kontrola i tretman 0.5% su imali više lipida i energije, kao i niži sadržaj vlage i pepela u odnosu na tretmane 1.5% i 2.5%. Nije bilo razlike u proteinskom sastavu (Tab.3). Retencija kalcijuma, magnezijuma i fosfora je bila statistički značajno niža u kontroli i hrani sa 0.5% oksalata u odnosu na hrane koje su sadržale 1.5% i 2.5% oksalata (Tab.4). Oksalati kod šarana imaju pozitivne efekte na rast i pretpostavlja se da bi to moglo biti zbog njihovog antimikrobijalnog delovanja u crevima. Efekti na telesni sastav su bili izraženi: više oksalata rezultiralo je višim sadržajem minerala i nižim sadržajem lipida. Tokom trajanja ogleda nije bilo antinutricionih efekata, naročito nedostatka minerala, kao što je to opisano u literature; ipak, bilo bi neophodno dugoročno ispitivanje koje bi uključilo i histopatologiju da bi se doneo zaključak da li su oksalati blagotvorni u hrani za šarana, kao i da bi se osvetlili potencijalni mehanizmi poboljšanog rasta

Building sustainable farms, ranches and communities : a guide to federal programs for sustainable agriculture, forestry, entrepreneurship, conservation, food systems, and community development

"A publication supported by U.S. Department of Agriculture agencies working together for sustainable places in collaboration with the Michael Fields Agricultural Institute (MFAI), the National Center for Appropriate Technology (NCAT), and the National Sustainable Agriculture Coalition (NSAC)"September 2020"This guide is written for anyone seeking help from federal programs to foster sustainable and innovative initiatives associated with agriculture and forestry in this country and territories. Sustainability can be understood to embrace the triple concepts of economic, environmental and social viability. A reader can find information about program resources pertaining to economic development; farm loans; insurance and risk management; local food systems, value added and marketing innovations; natural resources conservation and management; nutrition and consumer food access; renewable energy and energy conservation; and research and outreach. The guide can help farmers, researchers, entrepreneurs, community developers, private landowners, conservationists, and other individuals, as well as private and public businesses and organizations. It describes program resources ranging from grants and loans to technical assistance and information resources."--IntroductionAuthored by Donale Richards (MFAI), Margaret Krome (MFAI), Alejandra Hernandez (MFAI) and NSAC's policy staffIncludes bibliographical reference