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RISS 인기검색어
- 검색키워드
- 저자 : Jordon, Sherry Elaine (검색결과 9 건)
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Performance and slaughter breakeven analysis of calf and yearling systems and compensatory growth
Jordon, Douglas James The University of Nebraska - Lincoln 2000 해외박사(DDOD)
Four yr of yearling grow/finish systems were evaluated. In the first 2 yr, treatments were (1) animals grown at a ‘fast’ rate of winter gain (0.73 kg/d; FAST) using-wet corn gluten feed as an energy source and (2) animals grown at a ‘slow’ rate of winter gain (0.20 kg/d; SLOW). Treatments were designed to evaluate compensatory gain on summer grass. Summer forage intakes were measured in an attempt to explain any compensatory growth. Steers on the SLOW treatment gained faster during summer grazing compared to FAST; however, no differences were noted for kg forage intake/head. Steers on the SLOW treatment consumed more forage, as a percentage of body weight, compared to FAST. In yr 3 and 4, additional treatments were added: steers wintered at a ‘fast’ rate of gain using corn as an energy source (CORN), steers grown at a ‘fast’ rate of gain for half of the winter, followed by a ‘slow’ rate of gain (FAST/SLOW), and steers grown at a ‘slow’ rate of gain for half of the winter followed by a ‘fast’ rate of gain (SLOW/FAST). With this treatment structure, the effect of winter energy source and duration and severity of winter growth restriction were evaluated. Steers on the FAST/SLOW, SLOW/FAST, and SLOW treatments gained faster in the summer compared to FAST and CORN. Compensation ranged from 20–40%, and was not impacted by winter energy source or duration or severity of winter growth restriction. In addition, the 4 yr of yearling systems were evaluated in relation to calf-finishing (CALF). Only FAST and SLOW treatments were used. Steers on the CALF treatment consumed less feed and converted more efficiently, but gained less with more d on feed compared to yearlings. Steers on the FAST treatment were more profitable ($/head) compared to CALF and SLOW. Based on results from the above trials, steers must be fed to gain at increased rates over the winter to lower slaughter breakeven. Only 20–30% compensation on grass is realized following winter restriction.
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Nickelocene, Ferrocene, and Benzene Adsorbed on Silica and Activated Carbon: A Solid-State NMR Study
Benzie, Jordon William Texas A&M University ProQuest Dissertations & Thes 2020 해외박사(DDOD)
The ultimate goal of this thesis was to explore a new strategy for creating a nickel single atom catalyst (SAC) on a silica or activated carbon surface. It has been demonstrated in a preliminary experiment earlier that SAC formation might be possible by reducing nickelocene that had been dispersed on silica in a monolayer, with hydrogen. A Ni(0) catalyst had been obtained that was active for the cyclotrimerization of acetylenes. In order to explore this venue in detail, the objective of this thesis was to thoroughly investigate dynamic processes on silica surfaces that involve the supported molecular nickel complex nickelocene. As models for the paramagnetic and moderately sensitive nickelocene, benzene and the diamagnetic ferrocene have been employed. The studies relied mostly on solid-state NMR analyses because a plethora of different insights can be gained by this technique, especially with respect to molecular motions on surfaces. Dynamic processes do not only occur when catalysts immobilized covalently via linkers are suspended in a solvent. It has been discovered previously that metal complexes adsorbed via van der Waals interactions can also display different modes of mobility on diverse surfaces within pores, even in the absence of a solvent. Benzene and ferrocene can easily be obtained as deuterated species, which allow deuterium solid-state NMR analyses of their orientation on surfaces and their dynamics. Ferrocene can additionally be investigated as representative for all metallocenes and in particular for nickelocene that is slightly more reactive. For benzene, slow exchange between semi-bound and stationary, firmly adsorbed states has been found. In contrast to intuition, ferrocene is mostly adsorbed lying sideways on the surface. Nickelocene in comparison shows similar behavior, but a more robust interaction with the surface. When ferrocene and nickelocene are adsorbed in a sub-monolayer on the same surface they mix on the molecular level. This could be determined by analyzing the proton wideline signal halfwidths and relaxation times of both components at variable temperatures. The strong interactions between nickelocene and ferrocene on the support surface might even allow one to create well-defined dual Ni/Fe atom catalysts on the surface. The results described in this thesis enhanced the fundamental knowledge about how to create and characterize precursors for well-defined, atom-efficient, recyclable, supported catalysts which can lead to more sustainable processes in the future.
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Willard, Jordon R ProQuest Dissertations & Theses Southeastern Bapti 2020 해외박사(DDOD)
The project director completed this project to enhance his skill of implementing an emphasis on discipleship through a year-long expository sermon plan at Trinity Baptist Church (TBC). The project director wrote chapter 1 to describe the purpose of the ministry project. He articulated his ministerial and personal objectives for the project. Additionally, he detailed the ministry project and provided the rationale for the project.The project director composed chapter 2 to provide the biblical and theological foundations of the ministry project. The project director selected three passages of Scripture to exegete, interpret, and apply to his ministry project. Those passages consisted of Matt 28:18–20; 2 Tim 4:1–5; Eph 4:11–16. The project director’s exegesis, theological interpretation, and application relative to the ministry project supported the purpose and rationale of the ministry project. The project director wrote chapter 3 to provide ministry foundations for the ministry project. The ministry foundations included a literary review of the books most helpful to the project director in the ministry project process, interviews with expert scholars and practitioners in the areas of preaching and discipleship, and the year-long expository sermon plan for the purpose of promoting discipleship at TBC based on the project director’s categorical synthesis of the commands of Christ recorded in Matthew, Mark, Luke, and John. Thus, the project director’s work in Chapter Three further strengthened and established the ministry project.The project director wrote chapter 4 to describe the ministry project. He carefully explained the various stages of the implementation of the ministry project. In Chapter Four, the project director explained his selection process of the focus group and expert panel and detailed how he planned to use the feedback from both groups.In chapter 5, the project director analyzed the process and results of the ministry project. The project director evaluated his ministerial and personal objectives. He also considered the strengths and weaknesses of the ministry project based on the feedback of the expert panel and focus group. Finally, he assessed lessons he learned through personal reflection on the ministry project process.
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Soil Health and Nutrient Dynamics in Agroecosystems of the Midwestern US
Wade, Jordon The Ohio State University ProQuest Dissertations & 2019 해외박사(DDOD)
Soil health is an emerging framework that seeks to integrate the physical, chemical, and biological components of soil. It is defined by the USDA as "the continued capacity of soil to function as a vital living ecosystem that sustains plants, animals, and humans". The breadth of this definition has allowed "soil health" to become a context-specific definition, letting soil health be defined in terms of the desired outcomes. In the context of agronomic nutrient management, the primary desired outcome is a tightening of the nutrient cycle to minimize losses to the environment. Here, I use the framework of soil health to understand how soil health indicators influence and are influenced by on-farm nutrient management practices. Three separate studies were conducted to: 1) understand the factors influencing the efficacy of the most widely used biological soil health metric, mineralizable carbon, 2) determine the effect of 12 years of phosphorus (P) restriction on biological and physical soil health in three Ohio sites, and 3) integrate biological soil health indicators into nitrogen (N) management strategies across the Corn Belt. The first study found that mineralizable C was variable across and within soil test labs. However, even after controlling for variations in methodology, a significant amount of the variability was soil-specific. The second study found very few effects of P restriction on soil biological and physical health. However, P restriction slightly increased organic P stocks and resulted in consistent shifts in the balance between the processed and easily-metabolized portions of the active C pool. In the third and final study, an increase in soil biological health was shown to increase the yields for a given N fertilization rate, as well as having slight predictive abilities in predicting whether a site would be responsive to N fertilization. This study also showed that soil biological health may be slightly increased at moderate N fertilization rates. Collectively, these results show that biological soil health metrics can be used in nutrient management schemes, provided that a careful analysis and interpretation of the data is undertaken.
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Swain, Jordon Edwin ProQuest Dissertations & Theses Yale University 2017 해외박사(DDOD)
Leader humility has been linked to a number of positive outcomes such as greater employee satisfaction, lower turnover intention, enhanced group creativity, and improved team performance. However, the study of humility is still in its relative infancy. Questions remain about what causal mechanisms link humility to the various positive outcomes it appears to engender, how contextual differences may affect humility's outcomes and how it functions, and how those interested can easily and accurately gauge an individual's level of humility. This dissertation addresses some of these outstanding questions. It comprises three papers that employed a combination of experimental, cross-sectional, meta-analysis, and text analysis methods to examine humility in a military context or during tasks in which select members of the military regularly engage. The first chapter proposed and tested a causal model to explain how leader humility affects the performance of a team pursuing a highly interdependent task in a virtual environment -- much like military analysts coordinating electronically with geographically dispersed entities trying to compile a complete set of data to address mission requirements. Results from three experiments revealed that humble leaders are liked more by those they are in charge of and that they induce a greater sense of psychological safety in the teams they lead compared to their less humble counterparts. However, while conducting a hidden profile task, humble leaders did not appear to affect information flow or group performance any differently than leaders who are not humble. The second chapter examined how behaving humbly affects assessments of leadership potential among officers in the United States Army - with an added emphasis on exploring potential gender differences in how humble leaders are perceived. Results from a combination of four studies (one cross-sectional and three experimental) found that, contrary to what is hypothesized in the extant literature, humility is valued in the Army, although it may not be the only leader quality that positively affects perceptions of leadership potential. Further, results from a mini meta-analysis of the experimental data from the second chapter found that gender moderated the relationship between humility and perceptions of potential in the military, with men receiving more benefit from acting humbly than women. The third and final chapter in this dissertation proposed and tested a unique, unobtrusive means of assessing humility in a sample of cadets from the United States Military Academy and examined whether humility predicts their military performance at West Point. This final chapter also examined the effect gender has on humility's utility as a leader characteristic in the military. Results revealed that the proposed unobtrusive means of assessing humility possessed modest convergent validity, while proving to be a moderately significant predictor of military performance, even after controlling for several other demographic and experience related variables. No significant interaction between humility and gender in terms of their effect on military performance was noted.
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Wang, Jordon Kuo-Ming Stanford University 2009 해외박사(DDOD)
Epigenetics, the heritable changes in phenotype or gene expression caused by mechanisms other than the underlying DNA sequence, play an integral part in cell differentiation, development, and cancer. Recent discoveries of new classes of epigenetic regulators, such as noncoding RNAs (ncRNAs) and histone demethylases, have unlocked new molecules that not only shed light on complex mechanisms of regulation, but also provide potential therapeutic targets. We identified 231 ncRNAs in the HOX loci, genes essential in specifying positional identities of cells. We found that one of these ncRNAs, HOTAIR, reveals a novel mechanism of ncRNA guidance of transcriptional silencing via the Polycomb group (PcG) proteins in trans. PcG proteins regulate HOX expression and maintenance by trimethylating histone H3 on lysine 27 (H3K27me3), rendering the target transcriptionally silent. While regulation of HOX expression may influence the positional identity of cells and their differentiation, the mechanism downstream and putative targets remain poorly understood. We show that expression of HOXA13 is required and the transcriptional targets are sufficient to maintain epidermal inductive properties of distal fibroblasts. The discovery of histone demethylases has challenged the original concept that histone methylation is a permanent and stable epigenetic mark, and has raised the question of the existence of a H3K27me3 demethylase. We and others demonstrate the related JmjC domain-containing UTX and JMJD3 catalyze demethylation of H3K27me3, and UTX regulates H3K27 methylation at the HOX gene locus, where its absence results in misregulation of HOX genes and a significant posterior developmental defect. H3K27me3 has also been shown to inhibit the transcription of tumor suppressor genes. One of the core PcG proteins, H3K27 methylase EZH2, is amplified or overexpressed in human breast, prostate, and melanocytic tumors, and is a strong predictor of cancer progression. Here we show that the H3K27me3 demethylase UTX is essential for cell cycle control. Genome-wide chromatin occupancy analysis revealed that UTX bound multiple genes encoding RB-binding proteins, and UDC is required to remove H3K27me3 and maintain expression of several RB-binding proteins. In human cancer samples, loss of UTX expression is a significant predictor of disease progression and worse survival. Proper demethylation of H3K27me3 by UTX enables the RB-dependent cell cycle checkpoint and guards against cancer.
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Stuart Jordon Randell 고려대학교 국제대학원 2011 국내박사
South Korea has a strong record of economic growth and development which was made possible by the availability of abundant and low cost natural resources in the form of minerals and fossil fuels purchased from global markets. Without natural resources of its own, Korea was forced to rely on imports to develop its economy which today account for 97 percent of the minerals and 100 percent of the energy that the Korean economy uses. The problem Korea now faces is that the minerals and fossil fuels, which form the basis of its export economy, are no longer abundant or cheap. The current resource environment is high cost and unstable supplies. Price volatility and supply shortfalls are common and Korea's exposure is extremely high. The future environment that Korea will face is resource scarcity, skyrocketing prices, unstable supplies, hording, and increased geopolitical competition. Korea's economic and political stature puts it on the losing side in every scenario. The first question that this dissertation seeks to answer is where should Korea secure its resources from? After an exhaustive analysis of the competitive global resource environment, the location of remaining supplies, investment risk versus reward profiles, and Korea's experience, strengths and weaknesses, the answer is undoubtedly Africa. The reason for this is that Korea has always bought its resources and never developed a competitive industry capable of extracting them. It has simply arrived too late in the game to enter well developed and highly competitive markets like Canada or Australia. Even newly developed markets in middle income countries like Brazil, Russia or Kazakhstan, are flush with the world's largest and most competitive resource firms. For these reasons, Korea's strategy must be to enter Africa because its reserves are largely intact. Many of the largest reserves left on earth are found in Africa and the developmental challenges there, if overcome, can act as barriers to entry for competitors. The five African states Korea should secure its resources from are Algeria, Nigeria and Libya for their fossil fuels and South Africa and Namibia for minerals. The states selected are a mix of both low and medium risk countries that when investment is spread across them they provide the best balance of risk versus reward. The second question that this dissertation seeks to answer is how can Korea secure a stable supply of resources for its economy in the short and long term? The only reliable way to do this is through ownership, if not over the deposits themselves, then over the supply chain as close to the point of extraction as possible. The best way to do this is through foreign direct investment (FDI) and owning shares in mines, extraction or processing facilities, or being a member of financial, strategic or technical partnerships. Positioning oneself to be vital and irreplaceable in the extraction supply chain can help guarantee a share of the final product. The problem with this approach is that FDI projects of the size and scope required by Korea would be very high risk in some of the selected African states because they lack key public goods such as infrastructure which are needed to support such investment. To reduce the risk for Korean FDI projects and make them more viable, the Korean government should focus its aid programs on enhancing public goods in the target countries so that their economies are better equipped to support FDI. This way both Korean aid and FDI would be mutually supportive to each other. On a larger scale the two economies of Korea and the African host could both benefit from joining economic factors. Korea could provide the advanced factors of knowledge and technology while the African host provides the basic factors of natural resources which could be shared between the two economies. Research findings indicate that it is possible to share economic factors in one country with another country, for the benefit of both states. Numerous economic models, which have been adapted from Michael Porter's Diamond Model, have shown this to be true. This study has adapted the original Porter Diamond Model and it's most well known extensions to express the relationship between Korea and the five selected African host economies, if a combination of Korean FDI and aid were used to secure resources. The results strongly suggest the strategy for Korea to partner with the selected African states and combine FDI with aid to support Korean acquisition of vitally important resources for its economy.
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