9,521 research outputs found

    A very deep IRAS survey at l(II) = 97 deg, b(II) = +30 deg

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    A deep far-infrared survey is presented using over 1000 scans made of a 4 to 6 sq. deg. field at the north ecliptic pole by the IRAS. Point sources from this survey are up to 100 times fainter than the IRAS point source catalog at 12 and 25 micrometers, and up to 10 times fainter at 60 and 100 micrometers. The 12 and 25 micrometer maps are instrumental noise-limited, and the 60 and 100 micrometer maps are confusion noise-limited. The majority of the 12 micrometer point sources are stars within the Milky Way. The 25 micrometer sources are composed almost equally of stars and galaxies. About 80% of the 60 micrometer sources correspond to galaxies on Palomar Observatory Sky Survey (POSS) enlargements. The remaining 20% are probably galaxies below the POSS detection limit. The differential source counts are presented and compared with what is predicted by the Bahcall and Soneira Standard Galaxy Model using the B-V-12 micrometer colors of stars without circumstellar dust shells given by Waters, Cote and Aumann. The 60 micrometer source counts are inconsistent with those predicted for a uniformly distributed, nonevolving universe. The implications are briefly discussed

    INFLUENCES OF HUMAN CAPITAL AND FARM CHARACTERISTICS ON FARMERS' RISK ATTITUDES

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    We have two objectives for this paper. The first is to develop an index reflective of farmers' attitudes towards risk. In addition, we show how the risk indices are distributed by size of farm and other farm and operator characteristics, providing information as to how risk management tools may be used, and farm policies targeted. This information will be useful to help explain agricultural sector structural change, such as complex business arrangements arising in agriculture, and household portfolio investment choices.Farm Management, Labor and Human Capital, Risk and Uncertainty,

    FIELD EVALUATION OF TOBACCO ENGINEERED FOR HIGH LEAF-OIL ACCUMULATION

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    The biofuel market is dominated by ethanol and biodiesel derived from cellulosic and lipid-based biomass crops. This is largely due to the relatively low costs and reliability of production. At present, production of non-food plant-derived oils for biofuel production in the U.S. is minimal. A research team from the Commonwealth Scientific and Industrial Research Organization (CSIRO), an independent Australian federal government research institution, has developed an efficient transgenic system to engineer oil production in tobacco leaves. This novel system is comprised of multiple transgenes that direct the endogenous metabolic flux of oil precursors towards triacylglycerol (TAG) production. Additional genes were incorporated to store and protect the accumulated oil in vegetative tissues. Preliminary greenhouse tests by the CSIRO research group indicated an oil content of \u3e 30% by dry weight (DW) in tobacco leaf lamina. Here we evaluated two transgenic lines against a non-transgenic control in 2017 and 2018 in greenhouse and field production systems. The 2017 pilot study showed that the high leaf-oil tobacco line was viable and will grow in the field in Kentucky. Chemical analyses revealed significantly higher oil content compared to the non-transgenic control despite several logistical setbacks. These promising discoveries prompted the deployment of additional transgenic line assessments and further data validation in 2018. Line evaluations in 2018 revealed that the LEC2:WRI1:DGAT:OLE transgenic line had the highest leaf oil content (≥ 19.3% DW-1) compared to both the WRI1:DGAT:OLE transgenic line (≤ 5.6% DW-1) and non-transgenic control (≤ 2.1% DW-1). The results of this research will contribute to the successful development of transgenic tobacco lines engineered to accumulate high concentrations of TAG in the leaves

    News Clipping - 1961 - 25th Birthday Marked by Dr. White\u27s School

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    Article about the 25th anniversary of Lee McBride White\u27s school for handicapped children.https://digitalcommons.gardner-webb.edu/first-baptist-shelby-joseph-abram-white/1004/thumbnail.jp

    Foreigners, aliens, and strangers:foreign-born migration and settlement in England and Wales, 1851-1911

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    Migration into Britain is not a contemporary phenomenon; yet, nineteenth-century British migration history is disproportionately weighted towards those who left. In the nineteenth-century, hundreds of thousands of migrants arrived and settled in England and Wales. Yet, important gaps remain in the literature with respect to how migrants settled, integrated, and interacted with the host society. This thesis utilises a datadriven approach to investigate the composition and behaviours of foreign-born persons in England and Wales during the period 1851-1911 and establish who they were, where they came from, and what they did after arrival. Specifically, this thesis asks ‘to what extent did the foreign-born population integrate or segregate from the nativeborn population?’ Using the recently released Integrated Census Microdata (I-CeM), this thesis is the first to analyse the entire foreign-born population of England and Wales at an individual-level. Key themes considered in this thesis includes the demography and structure of foreign-born households, socio-economic composition, and spatial distribution of migrants. Two case studies, one from Newcastle upon Tyne, and another from East London, are used to contrast the residentially segregating behaviours of the migrant populations. A series of key findings are presented in this work. For example, less than twenty per cent of the migrant population lived exclusively with other migrants, indicating a tendency to interact with the host society. Taken holistically, therefore, this thesis establishes the national landscape of migrant composition, activity, and settlement, and provides a large-scale reconstitution of the foreign-born population and its different components

    Recommended Regeneration Strategies for Active Diesel Particulate Filters with Electrically Induced Filtering Media to Enhance Filtration Efficiency

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    The people of the world have become conscious of the effects human beings are having on the earth. This awareness has spawned a willingness to regulate the amount of pollution from fossil fuel combustion that human beings place on the environment. In the United States, the Environmental Protection Agency (EPA) and the California Air Resources Board (CARB) determine and regulate the emissions standards of on-and-off road engines through emissions testing. As emissions standards become more stringent, the demand to retain the efficiency of these engines is necessitated by pending fuel economy standards and customer acceptance. Diesel engines are implemented in various applications and range from passenger cars to heavy duty transportation of goods in the form of tractor trailers and trains, as well as most off road heavy duty equipment used for construction and farming due to their relative high thermal efficiency. However, diesel engines also produce significant particulate matter (PM).;One form of technology that can help diesel engines meet the new stringent emissions regulations is the diesel particulate filter (DPF). A DPF is used to reduce engine-out diesel PM on the order of 90%, by mass, by trapping the organic and inorganic PM and then oxidizing the organic matter at a later time. The technology has been implemented in various applications and has been a proven method of controlling PM for on-road passenger and heavy-duty diesel-fueled vehicles. However, the exhaust stream of a diesel engine is a volatile environment with pressure and temperature gradients that make the implementation and operation of DPFs a challenge. Additionally, it is necessary to eliminate the accumulated PM that deposits in the filter media. Many different methods of oxidizing the organic fraction of PM trapped within the DPFs filter media, also referred to as regenerating, have been developed.;The focus of this study was electrically-induced burn of PM captured on sintered metal fiber media. The findings of this study concluded that there are specific parameters that should be considered when constructing a control strategy for an electrically induced regeneration scheme. These parameters include the operational backpressure limitations of the engine as well as the PM production from the engine. A diesel oxidation catalyst (DOC) showed benefits for reducing the hydrocarbons in the emissions stream as well as contributing to the PM reduction efficiency by up to 30%. It is recommended that the DPF should maintain an operational back pressure below 120 in H 2O. This maintained a soot concentration which increased the filtration efficiency above 90%. Actuating the dual chambers on a higher frequency and limiting the length of burn to retain the soot buildup and backpressure resulted in filtration efficiencies levels above 90%

    Toxic Cyanobacteria Aerosols: Tests of Filters for Cells

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    Aerosolization of toxic cyanobacteria released from the surface of lakes is a new area of study that could uncover a previously unknown route of exposure to toxic cyanobacteria. Since toxic cyanobacteria may be responsible for adverse human health effects, methods and equipment need to be tested and established for monitoring these airborne bacteria. The primary focus of this study was to create controlled laboratory experiments that simulate natural lake aerosol production. I set out to test for the best type of filter to collect and analyze the aerosolized cells as small as 0.2-2.0 µm, known as picoplankton. To collect these aerosols, air was vacuumed from just above a sample of lake water passing through either glass fiber filters (GFF) or 0.22 µm MF-Millipore™ membrane filters (0.22 Millipore™). Filter collections were analyzed through epiflourescence microscopy for determining cell counts. Data analysis revealed that 0.22 Millipore™ filters were the best option for cell enumeration providing better epiflourescence optical quality and higher cell counts

    Counselor Education Unplugged? An Exploration of Current Attitudes Surrounding the Use of Online Learning as a Modality in Graduate Counselor Education

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    This dissertation qualitatively investigates counselor education faculty perceptions regarding online courses or programs and the overall perception of counselor education faculty regarding the effectiveness of online learning. A total of 154 counselor educators completed the CEATOLS instrument, a survey designed to capture demographic information, perceptions of effectiveness of online learning in counselor education, and concerns related to online learning in counselor education. Results indicate that, overall, counselor educators have a markedly lower perception of the effectiveness of online counselor education courses than of traditional Analysis of the concerns expressed by counselor educators reveal a five-factor structure similar to that which was hypothesized in the development of the CEATOLS instrument. Results indicate a need for further refinement of the CEATOLS instrument and additional study to better capture the specific factors that may be impacting the counselor education community’s perception of online learning as an effective medium of course delivery
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