Academic literature on the topic 'Site selection – Case studies'
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Journal articles on the topic "Site selection – Case studies"
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Heitzman, Eric, and Adrian Grell. "Planting Oaks in Group Selection Openings on Upland Sites: Two Case Studies from Arkansas." Southern Journal of Applied Forestry 30, no. 3 (August 1, 2006): 117–22. http://dx.doi.org/10.1093/sjaf/30.3.117.
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Abstract Two upland sites in Arkansas were studied to test the performance of 1-0 northern red oak (Quercus rubra L.) and white oak (Quercus alba L.) seedlings planted in group selection openings. Both red and white oak seedlings were planted at one location in the Ozark Mountains,and only red oak seedlings were planted at a second site along Crowleys Ridge. Holes were dug with power augers and seedlings were planted by hand. At the time of planting, the mean height of red oak and white oak seedlings at the Ozark site were 3.4 and 1.9 ft, respectively. Red oak seedlingsat Crowleys Ridge averaged 3.0 ft tall when planted. After 4 years at the Ozark site, 77% of red oak and 86% of white oak were alive. After 3 years at Crowleys Ridge, red oak survival was 80%. Seedlings at both sites grew slowly. Mean 4-year height increment at the Ozarksite was 2.1 ft for red oak and 2.5 ft for white oak, and mean 3-year height increment for red oak at Crowleys Ridge was 1.6 ft. Three years after planting in the Ozark Mountains and 2 years after planting at Crowleys Ridge, naturally regenerating competition had suppressed over one-thirdof the red oak and about one-half of the white oak. This necessitated a release treatment around planted seedlings at both sites. Oaks that decreased in total height over a given growing season were common. Most seedlings that decreased in height had been pulled over or crushed by other vegetationor exhibited top dieback. South. J. Appl.For. 30(3):142–146.
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Das, Manoja Kumar. "Experience of establishing and coordinating a nationwide network for bidirectional intussusception surveillance in India: lessons for multisite research studies." BMJ Open 11, no. 5 (May 2021): e046827. http://dx.doi.org/10.1136/bmjopen-2020-046827.
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ObjectivesTo document and share the process of establishing the nationally representative multisite surveillance network for intussusception in India, coordination, data management and lessons learnt from the implementation.DesignThis study combined both retrospective and prospective surveillance approaches.Setting19 tertiary care institutions were selected in India considering the geographic representation and public and private mixParticipantsAll children under-2 years of age with intussusceptionPrimary and secondary outcome measuresThe experience of site selection, regulatory approvals, data collection, quality assurance and network coordination were documented.ResultsThe site selection process involved systematic and objective four steps including shortlisting of potential institutions, information seeking and telephonic interaction, site visits and site selection using objective criteria. Out of over 400 hospitals screened across India, 40 potential institutions were shortlisted and information was sought by questionnaire and interaction with investigators. Out of these, 25 institutes were visited and 19 sites were finally selected to participate in the study. The multistep selection process allowed filtering and identification of sites with adequate capacity and motivated investigators. The retrospective surveillance documented 1588 cases (range: 14–652 cases/site) and prospective surveillance recruited 621 cases (range: 5–191 cases/site). The multilayer quality assurance measures monitored and ensured protocol adherence, complete record retrieval and data completeness. The key challenges experienced included time taken for obtaining regulatory and ethical approvals, which delayed completion of the study. Ten sites continued with another multisite vaccine safety surveillance study.ConclusionThe experience and results of this systematic and objective site selection method in India are promising. The systematic multistep site selection and data quality assurance methods presented here are feasible and practical. The lessons from the establishment and coordination of this surveillance network can be useful in planning, selecting the sites and conducting multisite and surveillance studies in India and developing countries.
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Stadtmann, Sven, and Philip J. Seddon. "Release site selection: reintroductions and the habitat concept." Oryx 54, no. 5 (November 23, 2018): 687–95. http://dx.doi.org/10.1017/s0030605318001199.
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AbstractIdentifying release sites with good habitat quality is one of the most important steps in any reintroduction project. However, despite their wide application in legislation and research, the habitat concept and habitat-related terms remain poorly defined and subject to confusion. Reviewing a variety of definitions, we advocate for understanding habitat as an area with a species-specific set of resources and environmental conditions that enable a population to persist and reproduce. Using this understanding we investigated release site selection as well as the usage of the term habitat and other habitat-related terms in 324 reintroduction case studies and reintroduction policy documents published during January 1990–May 2016. Although the use of the habitat concept in these publications remained mostly unclear because of the lack of definitions provided, we found an overall improvement in the quality of reintroduction site assessment, and a shift towards more systematic approaches, such as habitat modelling and experimental translocation. To further improve reporting on release site selection, we recommend updating IUCN reintroduction publications and encouraging practitioners to consider the spatial and temporal heterogeneity of habitat, as well as the multiple scales at which a species selects its habitat, in the design of a release site assessment.
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McShane, Marilyn D., Frank P. Williams, and Carl P. Wagoner. "Prison Impact Studies: Some Comments on Methodological Rigor." Crime & Delinquency 38, no. 1 (January 1992): 105–20. http://dx.doi.org/10.1177/0011128792038001007.
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Many pronouncements have been made in the process of site selection for new prisons. A review of the research literature on the effect of prisons on communities reveals that most of this information is unsupported by good research design. This essay presents a critique of the methodological and research design problems of prison impact studies. Various threats to validity are explored and two complementary methodologies, a single-site time series and multisite time series, are proposed for prison impact studies. Strict attention to internal-validity concerns will provide better answers to causal mechanisms and outcomes than is currently the case.
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Ünlü Öztürk, Ceren, and Ersin Türk. "Location Site Selection Preferences of Construction Firms that Offer Second Homes to Foreign Investors: The Case of Trabzon." Iconarp International J. of Architecture and Planning 9, no. 2 (December 21, 2021): 874–95. http://dx.doi.org/10.15320/iconarp.2021.184.
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Zhang, Bo Ren, Xiang Dong Zhu, and Chong En Wang. "Analysis on Site Selection and Spatial Layout of Buddhist Temple in Mountainous Region in Southeast of Shanxi Province - The Case of Dinglin Temple in Gaoping, Shanxi." Applied Mechanics and Materials 253-255 (December 2012): 71–74. http://dx.doi.org/10.4028/www.scientific.net/amm.253-255.71.
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Site selection and spatial layout of Dinglin Temple were studied through site surveys as well as field visits, then the science and culture connotation in site selection and spatial layout was analyzed so as to further reveal the characteristics of site selection and spatial layout of Buddhist architectures in mountainous region in southeast of Shanxi province.
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Zheng, Zilai, Takehiro Morimoto, and Yuji Murayama. "A GIS-Based Bivariate Logistic Regression Model for the Site-Suitability Analysis of Parcel-Pickup Lockers: A Case Study of Guangzhou, China." ISPRS International Journal of Geo-Information 10, no. 10 (September 26, 2021): 648. http://dx.doi.org/10.3390/ijgi10100648.
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The site-suitability analysis (SSA) of parcel-pickup lockers (PPLs) is becoming a critical problem in last-mile logistics. Most studies have focused on the site-selection problem to identify the best site from given potential sites in specific areas, while few have solved the site-search problem to determine the boundary of the suitable area. A GIS-based bivariate logistic regression (LR) model using the supervised machine-learning (ML) algorithm was developed for suitability classification in this study. Eight crucial factors were selected from 27 candidate variables using stepwise methods with a training dataset in the best LR model. The variable of the proximity to residential buildings was more important than that to various commercial buildings, transport services, and roads. Among the four types of residential buildings, the most crucial factor was the proximity to residential quarters. A test dataset was employed for the validation process, showing that the best LR model had excellent performance. The results identified the suitable areas for PPLs, accounting for 8% of the total area of Guangzhou (GZ). A decision-maker can focus on these suitable areas as the site-selection ranges for PPLs, which significantly reduces the difficulty of analysis and time costs. This method can quickly decompose a large-scale area into several small-scale suitable areas, with relevance to the problem of selecting sites from various candidate sites.
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Arleiny, Arleiny, Yoyok Soesatyo, and Erny Roesminingsih. "Management and Recommendations of Nautical Simulators and Laboratory: Multiple-Site Case Study." IJORER : International Journal of Recent Educational Research 3, no. 1 (January 30, 2022): 110–23. http://dx.doi.org/10.46245/ijorer.v3i1.192.
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This study aims to manage laboratory management and nautical simulators at Marine Science Polytechnic of Semarang and Polytechnic of Surabaya. Methods This research uses a multi-status study (multiple-site case study) in two institutions. This study uses interview guide instruments, observation sheets, and a list of documentation studies. The results showed that the laboratory management of Marine Science Polytechnic of Semarang and Polytechnic of Surabaya was said to be good. With qualifications in planning, supervising, managing, supervising laboratories and nautical simulators. Laboratory planning and nautical simulators at Marine Science Polytechnic of Semarang go through 4 (four) stages, the procurement preparation stage, the selection preparation stage, the selection implementation stage, and the contract implementation stage and handover of work results. Meanwhile, planning for laboratories and nautical simulators at Polytechnic of Surabaya is divided into 2 (two), procurement of new goods and maintenance. The findings in this study are emphasized on the results of data collection through interviews and documentation sent by resource persons to researchers. And the conclusion of the study shows that the quality management of both marine Science Polytechnic of Semarang and Polytechnic of Surabaya has been running well according to the procedure.
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Faisal, Raid, and Mohammed Ahmed. "GIS and AHP based modeling for landfill site selection (case study: west side of Mosul city)." Przegląd Naukowy Inżynieria i Kształtowanie Środowiska 27, no. 4 (January 10, 2019): 425–37. http://dx.doi.org/10.22630/pniks.2018.27.4.41.
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The accumulation of large quantities of solid waste inside Mosul city becomes a real residential and municipal management problem. There are many reasons including the existence of unplanned dumping sites within the city boundaries, and the absence of scientific researches which applies modern techniques for selecting the optimal solid waste landfill. This study uses geographic information system (GIS) and analytic hierarchical process (AHP) which is used to extract the weights with the help of Super Decision SD software. The studied variables data can be classified according to specified processing method into two types: continuous data, and discrete data. The ranking map has been designed after multiplying each variable with its extracted weight, then the final map has been created based on the values obtained from the ranking map. The results show that the optimal landfill area is located at south west Mosul city. This study aims at building a model by using GIS to determine the optimal and potential solid waste landfill site.
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Gumbo, Anesu D., Evison Kapangaziwiri, and Fhumulani I. Mathivha. "A Systematic Study Site Selection Protocol to Determine Environmental Flows in the Headwater Catchments of the Vhembe Biosphere Reserve." International Journal of Environmental Research and Public Health 19, no. 10 (May 21, 2022): 6259. http://dx.doi.org/10.3390/ijerph19106259.
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Developing nations will be worst hit by the impacts of climate change because limited resources hinder the spatial reach of climate studies, effort, and subsequent implementation to help with the improvement of livelihoods. Therefore, finding the best-case study is an essential undertaking in environmental assessments. This study explains one systematic approach to selecting a study site for an environmental assessment project. A desktop review of relevant literature, a simple factor scoring assessment process, reliance on expert opinion, and a field survey for ground-truthing were conducted. The desktop review showed the most critical factors to site selection. The scoring of these factors selected those that were crucial for the study. Experts validated the results and suggested the best study site among the ones identified. While the design is simplified, the proposed approach selects the most appropriate study site for environmental assessments.
Dissertations / Theses on the topic "Site selection – Case studies"
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Hawkins, Matthew Lane 1974, and Christian Eyre 1975 Foulger. "Quantifying the art of retail site selection : a retail case study." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/29893.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 2001.Includes bibliographical references (leaves 88-89).
Although there have been great strides in attempting to identify the locations that will yield the highest sales, the opinion among retailers remains that once the demographic, market, and sub-market analysis is complete, the choice of where to open a store within a sub-market is a matter of "feeling". Science can help a retailer pinpoint an optimal intersection that will enable it to place its goods and/or services in front of the largest number of potential customers, but it is the "art" of site selection that will enable a retailer to choose the best of the available locations surrounding the targeted intersection. There are invariably a number of appropriate alternative sites within a qualified trade area. Choosing the best location among these alternative sites is subjective. This "feeling" or "art" of selecting the relatively better location is something that is usually refined through years of developing the intuition for what will work the best. The purpose of this paper is to look at and then quantify the real estate variables that affect the relative attractiveness of available locations that exist within a delineated trade area. This is in an attempt to replace the subjectivity or "art" of selecting the best location with that of quantifiable results that prove that one site will result in higher sales than that of another. The results of the analysis show that the independent variables fail to predict sales per square foot with a requisite statistical significance. While the data failed to prove the hypothesis that the "art" of selecting retail locations can be replaced with quantitative analysis, the authors believe that with a larger sample size real estate factors can provide valuable insight into sales per square foot forecasts.
by Matthew Lane Hawkins and Christian Eyre Foulger.
S.M.
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Lashkari, Hormoz, and Christopher Voutsinas. "Site selection criteria for resort development and a case study in northern New England." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/68244.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1990.Includes bibliographical references (leaves 167-170).
by Hormoz Lashkari and Christopher Voutsinas.
M.S.
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Chabuk, Ali Jalil. "Analysis of Landfill Site Selection-Case Studies Al-Hillah and Al-Qasim Qadhaas, Babylon, Iraq." Licentiate thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-347.
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The selection of a landfill site is considered as a complicated task because the whole process is based on many factors and restrictions. This study shows the present status of solid waste management, solid waste sources, staffing for solid waste collection, machinery and equipment used in the waste collection process, finance and financial management at Babylon Governorate and its Qadhaa. The management of collection and disposal of waste in Babylon Governorate and its Qadhaa is done through open dumping of waste and the quality of the collection process is poor. This is the case in Al-Hillah Qadhaa, which is located in the central part of the governorate, Iraq and Al-Qasim Qadhaas, which is situated in the southern part of the Babylon Governorate, Iraq. These sites do not conform to the scientific and environmental criteria applied in the selection of landfill sites. In the first part of the current study, to find out how much solid waste will be produced in the future; two methods were used to calculate the population growth in Al-Hillah and Al-Qasim Qadhaas to the year 2030. The results showed that the total waste in 2030 according to the first and second methods respectively will be 394,081 tonnes and 472,474 tonnes in Al-Hillah Qadhaa, and (54,481 tonnes and 76,374 tonnes) in Al-Qasim Qadhaa. The cumulated quantity of solid waste expected to be produced between 2020 and 2030 according to the first and second methods respectively was 3,757,387 tonnes and 4,300,864 tonnes in Al-Hillah Qadhaa, whilst in Al-Qasim Qadhaa it was 519,456 tonnes and 695,219 tonnes. The generation rate in 2020 will be (0.88 and 0.62) kg/ (capita. day) in Al-Hillah and Al-Qasim Qadhaas respectively; in year 2030, the generation rate will be (0.97 and 0.69) kg/ (capita. day) based on method 2 and an expected incremental increase in generation rate of 1 kg/ (capita. day) per year. The second part of this study aims to find the best sites for landfills in Al-Hillah and Al-Qasim Qadhaas. For this reason, 15 criteria were adopted in this study (groundwater depth, rivers, soil types, agricultural land use, land use, elevation, slope, gas pipelines, oil pipelines, power lines, roads, railways, urban centres, villages and archaeological sites) using GIS (geographic information system), which has a large capacity for managing input data. In addition, the AHP (analytical hierarchy process) method was used to derive the relative weightings for each criterion using pairwise comparison. The suitability index map for candidate landfill sites was obtained. Two suitable candidate landfill sites were found to fulfill the scientific and environmental requirements in each Qadhaa, with areas of 9.153 km2 and 8.204 km2 respectively in Al-Hillah Qadhaa, and with areas of 2.766 km2 and 2.055 km2 respectively in Al-Qasim Qadhaa. The area of these sites can accommodate solid waste from 2020 until 2030 based on the required areas, which were 4.175 km2 and 4.778 km2 (Ali-Hillah Qadhaa) and 0.577 km2 and 0.772 km2 in (Al-Qasim Qadhaa) according to the first and second methods respectively.
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Steer, Lorn Adam. "Site selection for the Small-Scale Aquaculture Farming Systems in the Western Cape : a GIS application." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/1653.
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Lu, Pei-Yi. "Off-site art curating : case studies in Taiwan (1987-2007)." Thesis, Birkbeck (University of London), 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.645199.
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The aim of this thesis is to develop a concept of 'off-site art' as a distinct mode of art production, and further argues that a specific approach to curating. 'off-site art curating', is required in order to realize the potential of this art form. Off-site art refers to works in temporary exhibitions which are held away from the gallery space and which create their own time-space on site, usually being 'site-specific' and 'context-sensitive'. Taking place in the real living environment, off-site art, on the one hand, is liberated from the limitations imposed by an institution, while on the other hand it naturally encounters difficulties being sited in a broader social, economic and political arena; in this sense, off-site art could be considered in part to be a reflection of spatial-political circumstances and problems encountered on site. Three questions will be discussed: what is off-site art and why it is significant? What is the relationship between artworks, environmental context and viewers in off-site art exhibitions? and what is the role of the curator and how might the curating of off-site art work? The research is based on an interdisciplinary approach, and a number of off-site art exhibitions held in Taiwan during the period 1987 to 2007 will be taken as case studies in order to examine four primary aspects: off-site art curating and politics; off-site art curating and business; off-site art curating and urban regeneration; off-site art curating and the community. I argue that the value of off-site art lies in the fact that art should not be confined to a gallery; instead, art manifests its power in everyday life. The task of off-site art curating is to create a support system that mediates between the diverse forces in operation in order to ensure that art is valued as art itself rather than merely playing a subsidiary role serving political, economic or any other purposes.
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Weems, Cathy Jo. "Site-based Curricular Decision Making : A Case Study." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc277991/.
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關信堅 and Shun-kin Dennis Kwan. "Multi-criteria decision support using analytic hierarchy process: the case study of project site selection." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31251377.
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Kwan, Shun-kin Dennis. "Multi-criteria decision support using analytic hierarchy process : the case study of project site selection /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25948040.
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Morris, Ellen Victoria. "Affordable housing in a "high-tech Mayberry" : site selection and policy tools for San Mateo County, California." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104984.
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Thesis: M.C.P., Massachusetts Institute of Technology, Department of Urban Studies and Planning, 2016.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 89-97).
California's Affordable Housing & Sustainable Communities (AHSC) program offers gap financing to affordable housing developments and infrastructure projects that demonstrate reductions in greenhouse gas emissions. Funded through revenue from the state's carbon cap-and-trade market and motivated by statewide requirements to incentivize compact infill development near transit, AHSC challenges affordable housing developers, transit agencies, and city staff to work collaboratively to address issues of congestion, displacement, and transit access in the context of far-reaching sustainability goals. However, AHSC requirements in its inaugural year (2014-2015) favored projects in California's largest, densest cities, leaving suburban communities skeptical of their ability to tap into the state's largest new pot of funding for affordable housing. One such place is San Mateo County, California, the suburban region on the San Francisco Peninsula that connects San Francisco to San Jose and Silicon Valley. It is within the context of the AHSC program in San Mateo County that I pose the question: to what extent should affluent suburban communities assume a portion of the region's overall housing needs? I consider three scholarly discussions -- suburbanization of poverty, spatial mismatch theory, and exclusionary housing policy -- together to forge an alternative conception of affluent, transit-rich, and diverse inner-ring suburbs and their obligations to steward affordable housing development. To implement this conception on the ground, I consider the opportunities and barriers to affordable housing development in San Mateo County, identify sites that would be competitive for future rounds of AHSC funding, and propose policies and programs to protect critical sites.
by Ellen Victoria Morris.
M.C.P.
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David, LaKisha T. (LaKisha Tawanda). "A case for public sanitation with on-site treatment in Ghana." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90199.
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Thesis: M.C.P., Massachusetts Institute of Technology, Department of Urban Studies and Planning, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 57-60).
According to the WHO/UNICEF Joint Monitoring Programme (JMP), 14% of the population in Ghana use improved sanitation facilities and 59% use shared facilities. The objective of this thesis is to offer a situational analysis of public sanitation in Ghana by addressing both access to sanitation and bio-digestion on-site waste treatment for one non-profit organization, Pure Home Water, to improve access to sanitation in the Northern Sector of Ghana. Based on the neighborhood, customary, and political context of Ghana, I recommend the construction of new public sanitation facilities, the conversion of existing household toilets to the biodigester systems, and making bio-digester systems a standard technical model while creating local ownership of the technology. In addition, I recommend evaluating the status quo to address the needs of vulnerable groups, addressing hygiene needs as standard, and appealing to the local government's business sense.
by LaKisha T. David.
M.C.P.
Books on the topic "Site selection – Case studies"
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Lampropoulos, Andreas, ed. Case Studies on Conservation and Seismic Strengthening/Retrofitting of Existing Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2020. http://dx.doi.org/10.2749/cs002.
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<p>Recent earthquakes have demonstrated that despite the continuous developments of novel materials and new strengthening techniques, the majority of the existing structures are still unprotected and at high seismic risk. The repair and strengthening framework is a complex process and there are often barriers in the preventative upgrade of the existing structures related to the cost of the applications and the limited expertise of the engineers. The engineers need to consider various options thoroughly and the selection of the appropriate strategy is a crucial parameter for the success of these applications.</p><p>The main aim of this collection is to present a number of different approaches applied to a wide range of structures with different characteristics and demands acting as a practical guide for the main repair and strengthening approaches used worldwide. This document contains a collection of nine case studies from six different countries with different seismicity (i.e. Austria, Greece, Italy, Mexico, Nepal and New Zealand). Various types of structures have been selected with different structural peculiarities such as buildings used for different purposes (i.e. school buildings, town hall, 30 storey office tower), a bridge, and a wharf. Most of the examined structures are Reinforced Concrete structures while there is also an application on a Masonry building. For each of the examined studies, the local conditions are described followed by the main deficiencies which are addressed. The methods used for the assessment of the in-situ conditions also presented and alternative strategies for the repair and strengthening are considered.</p>
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United States. Environmental Protection Agency, ed. Abstracts of remediation case studies. [Washington, DC]: United States Environmental Protection Agency, 1995.
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De la Torre, Marta, 1946- and Getty Conservation Institute, eds. Heritage values in site management: Four case studies. Los Angeles: Getty Conservation Institute, 2005.
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Burt, Christina N., and Louis Caccetta, eds. Equipment Selection for Mining: With Case Studies. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76255-5.
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Sanders, Welford. Manufactured housing site development guide. Chicago, IL (1313 E. 60th St., Chicago 60637): American Planning Association, 1993.
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Verhagen, Philip. Case studies in archaeological predictive modelling [sic. [Leiden]: Leiden University Press, 2007.
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Verhagen, Philip. Case studies in archaeological predictive modelling [sic. [Leiden]: Leiden University Press, 2007.
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Practices, LLC Best. Managing world-class call centers: Site visit findings. Chapel Hill, NC: Best Practices, 2001.
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Hoggarth, Liz. Selection for community service orders. Aldershot: Avebury, 1991.
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Lee, Eden Bradford, ed. Content management systems in libraries: Case studies. Lanham, Md: Scarecrow Press, 2008.
Find full textBook chapters on the topic "Site selection – Case studies"
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Kuehn, Friedrich. "Case Studies." In Remote Sensing for Site Characterization, 63–185. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-56978-4_6.
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Belmecheri, Soumaya, William E. Wright, and Paul Szejner. "Sample Collection and Preparation for Annual and Intra-annual Tree-Ring Isotope Chronologies." In Stable Isotopes in Tree Rings, 103–34. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_4.
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AbstractThis chapter provides guidance for conducting studies based on stable isotope measurements in tree rings to infer past and present climate variability and ecophysiology. Balancing theoretical perspectives of stable isotope variations recorded in tree rings, intended research applications (paleoclimate or ecophysiology) and resource limitations, this chapter describes key aspects of field sampling strategies and laboratory sample processing. It presents an overview of factors influencing variations and thus interpretations of carbon and oxygen isotopes, including juvenile/age effects, canopy status and stand characteristicsto inform sampling strategies that optimize a robust paleoenvironmental and physiological signal with statistically defined confidence limits. Fieldwork considerations include the selection of a study site and trees, field equipment, and sample requirements to recover sufficient material for isotopic measurements, and the desired environmental signal. Aspects of laboratory sample processing include choosing a sampling resolution (e.g. whole ring, earlywood/latewood, thin section, etc.), sample pooling within and between trees, and particle size requirements for chemical extraction and analytical repeatability. Finally, this chapter provides a case study highlighting the potential benefits and limitations of high-resolution sub-seasonal sampling.
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Belmecheri, Soumaya, William E. Wright, and Paul Szejner. "Sample Collection and Preparation for Annual and Intra-annual Tree-Ring Isotope Chronologies." In Stable Isotopes in Tree Rings, 103–34. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_4.
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AbstractThis chapter provides guidance for conducting studies based on stable isotope measurements in tree rings to infer past and present climate variability and ecophysiology. Balancing theoretical perspectives of stable isotope variations recorded in tree rings, intended research applications (paleoclimate or ecophysiology) and resource limitations, this chapter describes key aspects of field sampling strategies and laboratory sample processing. It presents an overview of factors influencing variations and thus interpretations of carbon and oxygen isotopes, including juvenile/age effects, canopy status and stand characteristicsto inform sampling strategies that optimize a robust paleoenvironmental and physiological signal with statistically defined confidence limits. Fieldwork considerations include the selection of a study site and trees, field equipment, and sample requirements to recover sufficient material for isotopic measurements, and the desired environmental signal. Aspects of laboratory sample processing include choosing a sampling resolution (e.g. whole ring, earlywood/latewood, thin section, etc.), sample pooling within and between trees, and particle size requirements for chemical extraction and analytical repeatability. Finally, this chapter provides a case study highlighting the potential benefits and limitations of high-resolution sub-seasonal sampling.
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Kampa, Eleftheria, and Wenke Hansen. "Selection of Case Studies." In Heavily Modified Water Bodies, 17–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18647-9_3.
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Sethna, Christine B. "Catheter Exit-Site and Tunnel Infections." In Pediatric Dialysis Case Studies, 51–57. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55147-0_7.
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Davidsson, Per. "Sampling and Case Selection Issues." In International Studies in Entrepreneurship, 115–54. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26692-3_5.
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Wang, Wanlong, Henry W. Stoll, and James G. Conley. "Tooling Alternative Selection Case Studies." In Mechanical Engineering Series, 117–41. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-5731-3_7.
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Rohlfing, Ingo. "Types of Case Studies and Case Selection." In Case Studies and Causal Inference, 61–96. London: Palgrave Macmillan UK, 2012. http://dx.doi.org/10.1057/9781137271327_3.
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Firehock, Karen. "Case Studies: From Region to Site." In Strategic Green Infrastructure Planning, 83–102. Washington, DC: Island Press/Center for Resource Economics, 2015. http://dx.doi.org/10.5822/978-1-61091-693-6_5.
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Sutton, Matthew. "Bayesian Variable Selection." In Case Studies in Applied Bayesian Data Science, 121–35. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42553-1_5.
Full textConference papers on the topic "Site selection – Case studies"
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Brotzman, John M. "NOX Control Systems: SCR Bypass Systems — 20,000 MW of Case Studies." In ASME 2004 Power Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/power2004-52173.
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Correct design and layout of the SCR BYPASS SYSTEM is critically important to the efficiency and operation of power plants. Utilities have even had to consider closing down plants that could not efficiently operate their Bypass Systems. Numerous gas path configurations are available, which vary considerably based on site and space limitations, construction lifting capabilities and site construction limitations, as well as other key considerations specific to each plant site. This technical paper discusses a number of arrangements, technical selection and layout criteria. This paper discusses case studies and design details of approximately 20,000 MW of successful bypass system equipment which improve system performance, reduce pressure drop, reduce abrasive wear, substantially minimize maintenance costs and simplify operating requirements.
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Vincent Andersen, Ingrid Marie, and Gaute Storhaug. "Dynamic Selection of Ship Responses for Estimation of On-Site Directional Wave Spectra." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83206.
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Knowledge of the wave environment in which a ship is operating is crucial for most on-board decision support systems. Previous research has shown that the directional wave spectrum can be estimated by the use of measured global ship responses and a set of transfer functions determined for the specific ship. The approach can either be based on parametric or Bayesian (non-parametric) modelling, and in both cases a set of three ship responses usually provides the best estimation. The optimal response combination of three responses at any time depends on the environmental conditions and the operation of the ship. Since measurements of more than three responses are usually available, a quick, dynamic selection procedure of the three signals best suited for the wave spectrum estimation procedure is essential. In the present paper the concept of a selection method based on a simple pre-estimate of the wave spectrum is suggested. The selection method needs to be robust for what reason a parameterised uni-directional, two-parameter wave spectrum is treated. The parameters included are the zero up-crossing period, the significant wave height and the main wave direction relative to the ship’s heading. The procedure basically seeks to minimise the difference between a set of spectral moments derived from a measured response spectrum and the corresponding response spectrum calculated from the parameterised wave spectrum and the transfer function for any given response. Subsequently, the three responses with the best overall agreement are selected for the actual estimation of the directional wave spectrum. The transfer functions for the ship responses can be determined using different computational methods such as striptheory, 3D panel codes, closed form expressions or model tests. The uncertainty associated with transfer functions depends on the computational method used, relative heading, frequency and type of response. This uncertainty is conceptually taken into account in the selection procedure using the First Order Reliability Method (FORM). However, specific assessment of the uncertainties has not been carried out, but is subject to later studies.
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Cheaitani, Mohamad J. "Case Studies on ECA-Based Flaw Acceptance Criteria for Pipe Girth Welds Using BS 7910:2005." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29558.
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The use of an engineering critical assessment (ECA) approach to derive flaw acceptance criteria for pipe girth welds has become common practice. It allows the maximum tolerable size of weld flaws to be determined on a fitness-for-purpose basis, offering substantial advantages over the conventional workmanship approach. BS 7910:2005 is widely used to derive ECA-based flaw acceptance criteria for pipe girth welds. It offers a flexible assessment framework within the context of the well-established failure assessment diagram (FAD) approach. However, it can be relatively complex to apply and it may lead to assessments that are more conservative than codified pipeline-specific procedures. This paper illustrates, through practical case studies on assessing the significance of circumferential girth weld flaws, some of the options available to the user of BS 7910. The case studies cover the selection of the FAD (generalised or material-specific, with and without yield discontinuity), tensile properties (specified minimum or actual values); fracture toughness properties (single point CTOD values including δ0.2BL and δm, or full CTOD resistance R-curve), and welding residual stress (assumed to be uniform through the pipe wall with a yield strength magnitude, or considered to have a through-wall distribution associated with a specific level of welding heat input).
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West, Julia M., Ian G. McKinley, and Simcha Stroes-Gascoyne. "Implications of Microbial Redox Catalysis in Analogue Systems for Repository Safety Cases." In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16336.
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A detailed assessment of studies of oxidising redox fronts around fractures at depth in otherwise “reducing” environments suggests that the usual explanation, in terms of past disturbances that have resulted in deep penetration of oxidising water, are incompatible with hydrogeological and/or geochemical observations. An alternative hypothesis, microbial catalysis of kinetically slow or hindered reactions involving oxyanions such as sulphate or carbonate, appears potentially more credible. Although still not always taken into account by the geochemical community, the role of microbial metabolism in low temperature geochemistry is supported by the rapidly expanding database on subsurface microbial populations. These populations are demonstrated to be viable and, therefore, could potentially be active at levels close to or below current detection limits in deep geological systems. Indeed, inspection of information available from several analogue studies or repository site characterisation programmes suggests that such activity may explain some of the geochemical anomalies encountered. This paper examines the current (indirect) evidence for microbial redox catalysis in relevant subsurface rock matrix environments and considers the implications that this would have for the development of site understanding — and in particular the identification of factors that may distinguish between different locations during site selection. Further, it examines the wider implications of more extensive roles of microbes in repository systems on the overall post-closure safety case and the need for further focused analogue studies to develop answers to these open questions.
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Wan, Ping K., Desmond W. Chan, and Alice C. Carson. "Environmental Considerations for Preparing Permit Applications of New Nuclear Power Plants Located in Greenfield Sites." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29330.
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Nuclear power generation has become an increasingly attractive alternative in the United States (U.S.) power market due to several factors: growing demand for electric power, increasing global competition for fossil fuels, concern over greenhouse gas emissions and their potential impact on climate change, and the desire for energy independence. Assuring the protection of people and the environment are of paramount concern to nuclear power generators and regulators as we move towards a possible nuclear renaissance. Thus, sound engineering design is of utmost important and potential environmental and safety concerns must be carefully evaluated and disposition during permitting of the new nuclear power plants. Areas to be considered in order to alleviate these concerns include the following: • Site meteorology and dispersion conditions of the area; • Evaluation of radiological consequence during normal plant operation and emergency conditions; • Water availability for plant cooling system; • Evaluation of potential land use, water use, ecological and socioeconomic impacts of the proposed action. This paper focuses on site suitability evaluation for greenfield sites through site characterization, examination of challenges/constraints in deployment of available technology/plant systems, and mapping of permitting compliance strategy. Case studies related to selection of plant systems based on the environmental site conditions, preferred compliance plan, and public acceptance, are included.
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Lee, Jaesung, Shiyu Zhou, and Junhong Chen. "Sequential Robust Parameter Design With Sample Size Selection." In ASME 2022 17th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/msec2022-85690.
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Abstract In designing engineering systems, it is crucial to find a robust design whose responses have minimal variations and satisfies a constraint on the mean, also known as robust parameter design (RPD). Such optimization is challenging because collecting data is often expensive, and modern engineering systems commonly produce responses whose mean and variance are complex unknown functions of control variables. To address these challenges, we propose a stochastic constrained Bayesian optimization for RPD. We construct the Gaussian process dual response surrogate models for the mean and variance of the response by the sample mean and sample variance. The predicted mean and quantified uncertainties through the surrogate models are utilized to exploit the predictions and explore the regions with high uncertainty in the proposed Bayesian optimization method. Because the sample size of the sample mean and sample variance affects the performance significantly, we propose an effective sample size selection scheme, which effectively balances between exploitation and exploration during optimization. The performance of our method is demonstrated in numerical and case studies. In the case study, we used the real-world data for the robust design of the Graphene field-effect transistor nanosensors.
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Liu, Tuanjie, Xiaohong Chen, and Wei Ye. "Concept Selection Philosophy for Floating Control Facilities." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20805.
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Floating control facilities (FCFs) are designed to support fields using only subsea production system. Potential concepts, including Tension Leg Platform (TLP), Spar and semi-submersible can be selected as the FCFs. This paper discusses the philosophy of concept selection for FCFs. Two basic considerations for concept selection for FCFs are functional requirements and costs. Different structure types are first to be sized to meet the functional requirements for given water depths, environmental conditions and soil conditions. Then the costs for the procurement, construction, installation, hook up and commissioning for different concepts are estimated based on the sizes. Finally, the most cost-effective concept is chosen for further study to confirm the feasibilities of the concept by detailed analyses. Global sizing tools assisting concept selection have been developed by Ocean Dynamics LLC (Limited Liability Company) (ODL) over the past years. For a given concept, these sizing tools can find the optimized size based on costs to meet the functional requirements. Capabilities of the sizing tools cover the general layout, weight estimate (hull and deck), riser weight and stiffness estimate, loading conditions (transportation, normal operating, extreme, survival), hydrostatics and stability, natural periods, motions, air gap, environmental loads (wind, current, and mean wave forces), mooring sizing, cost estimate, and optimization based on the total costs. Two case studies in two different water depths, 140m and 1200m, are presented to illustrate the procedures and considerations in concept selection for floating control facilities. The FCFs used in the case studies are to support a Super Puma helideck, satellite communication equipment, an umbilical riser and option for a 3.5″ pipeline riser, with a total estimated topside payload as 400 Metric Ton (MT).
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Greene, John F., and Dara Williams. "The Influence of Drilling Rig and Riser System Selection on Wellhead Fatigue Loading." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83754.
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With drilling and exploration activity currently high in both deep and shallow water regions rig availability and selection is an issue for operators to consider in order to achieve the desired exploration schedule. At present the industry focus is on the development of 6th generation drilling rigs with the capacity to operate in increasing deep water. However despite the focus on deepwater exploration and the associated demand for deepwater drilling rigs there still exists demand for drilling rigs that can operate in shallow to moderate water depths (100m–500m). In addition, certain field development scenarios may exist where planned water depths for drilling activities vary significantly and therefore a drilling rig and riser system is required that can operate satisfactorily in both shallow and deep water depths. For a given drill site, rig availability or well location, may be such that an operator may have to select a modern deepwater 6th generation rig for shallow water activities where a 3rd generation rig would appear to provide a better solution. Other considerations such as vessel station keeping requirements may lead to selection of a 6th generation rig over a 3rd generation rig, as the former tend to have improved DP thrusters capacity. However it is also important to note that while the 6th generation rigs may have been proven to be robust systems for operation in deep water, the response of a 6th generation drilling system in shallow water depths can be very different to that of an older 3rd generation rig and drilling riser system. Thus careful consideration must be made by the operator when considering the selection of drilling vessels for shallow to moderate water depths. Fatigue life of the wellhead is shown to be affected when one compares the response of the 6th generation and 3rd generation drilling systems in shallow to moderate depths. This also needs to be accounted for when selecting rigs for workover or intervention operations on older infrastructure. This paper presents a discussion on the various parameters such as BOP stack size, riser, flex joint and vessel design that influence the response of the drilling system in shallow to moderate water depths (100m–500m). A number of case studies and parametric studies have been carried out and the results of these are presented in order to compare the wellhead fatigue damage from the older 3rd generation systems with the 6thgeneration systems and also to identify the critical drivers for this fatigue life reduction.
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Nesbitt, Victoria A. "The Phytoremediation of Radioactively Contaminated Land: A Feasible Approach or Just Bananas?" In ASME 2013 15th International Conference on Environmental Remediation and Radioactive Waste Management. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icem2013-96318.
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Soil is an essential component of all terrestrial ecosystems and is under increasing threat from human activity. Techniques available for removing radioactive contamination from soil and aquatic substrates are limited and often costly to implement; particularly over large areas. Frequently, bulk soil removal, with its attendant consequences, is a significant component of the majority of contamination incidents. Alternative techniques capable of removing contamination or exposure pathways without damaging or removing the soil are therefore of significant interest. An increasing number of old nuclear facilities are entering ‘care and maintenance’, with significant ground contamination issues. Phytoremediation — the use of plants’ natural metabolic processes to remediate contaminated sites is one possible solution. Its key mechanisms include phytoextraction and phytostabilisation. These are analogues of existing remedial techniques. Further, phytoremediation can improve soil quality and stability and restore functionality. Information on the application of phytoremediation in the nuclear industry is widely distributed over an extended period of time and sources. It is therefore difficult to quickly and effectively identify which plants would be most suitable for phytoremediation on a site by site basis. In response, a phytoremediation tool has been developed to address this issue. Existing research and case studies were reviewed to understand the mechanisms of phytoremediation, its effectiveness and the benefits and limitations of implementation. The potential for cost recovery from a phytoremediation system is also briefly considered. An overview of this information is provided here. From this data, a set of matrices was developed to guide potential users through the plant selection process. The matrices take the user through a preliminary screening process to determine whether the contamination present at their site is amenable to phytoremediation, and to give a rough indication as to what plants might be suitable. The second two allow the user to target specific plant species that would be most likely to successfully establish based on prevailing site conditions. The outcome of this study is a phytoremediation tool that can facilitate the development of phytoremediation projects, avoiding the need for in-depth research to identify optimal plant species on a case-by-case basis.
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Roh, Byeong-Min, Soundar R. T. Kumara, Hui Yang, Timothy W. Simpson, Paul Witherell, and Yan Lu. "In-Situ Observation Selection for Quality Management in Metal Additive Manufacturing." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-70035.
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Abstract Metal additive manufacturing (MAM) provides a larger design space with accompanying manufacturability than traditional manufacturing. Recently, much research has focused on simulating the MAM process with regards to part geometry, porosity, and microstructure properties. Despite continued advances, MAM processes have many variables that are not well understood with respect to their effect on the part quality. With the common use of in-situ sensors — such as CMOS cameras and infrared cameras — numerous, real-time datasets can be captured and analyzed for monitoring both the process and the part. However, currently, real-time data predominantly focuses on the build failure and process anomalies by capturing the printing defects (cracks/peel-off). A large amount of data — such as melt pool geometries and temperature gradients — are just beginning to be explored, along with their connections to final part quality. Towards investigating these connections, in this paper we propose models that capture numerous sensor capabilities and associate them with the corresponding, real-time, physical phenomena. These sensor models lay the foundation for a comprehensive, knowledge framework that forms the basis for quality monitoring and management of MAM process outcomes. Using our previously developed process ontology model [1–3], which describes the relationship between process variables and process outcomes, we can discover the relationship between the real-time, physical phenomena and the deviations in the targeted, build quality. For example, statistically significant sensor data that predicts deviations from targeted process qualities can be detected and used to control the process parameters. Case studies that scope the physical phenomena and sensor data are provided for verifying the effectiveness and efficiency of the proposed qualification and certification models.
Reports on the topic "Site selection – Case studies"
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Teja, Malladi, Jain Garima, Kraleti Sunil, Ramoji Sushmita, and Balasubramanian Aishwarya. Risk-related Resettlement and Relocation in Urban Areas: Detailed Site Case Studies (Site Report II). Indian Institute for Human Settlements, 2016. http://dx.doi.org/10.24943/cirf2.2016.
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Buska, James, Alan Greatorex, and Wayne Tobiasson. Site-specific case studies for determining ground snow loads in the United States : case study spreadsheet. Engineer Research and Development Center (U.S.), July 2020. http://dx.doi.org/10.21079/11681/37574.
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Padhye, Suyash, Isaiah Mwamba, Kyubyung Kang, Samuel Labi, and Makarand Hastak. Safety, Mobility, and Cost Benefits of Closing One Direction of the Interstate in Rural Areas During Construction Work. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317345.
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With specific regard to interstates in the rural area, Indiana Department of Transportation (INDOT) has expressed a need for research that sheds light on this Maintenance of Traffic (MOT) issue so the agency [INDOT and the contractor] can make informed decisions regarding the crossover sections versus the closure in one direction with detour roads. A number of studies have investigated the advantages and disadvantages of various MOT strategies; however, there is no specific study that can help INDOT traffic engineers and design engineers make decisions by comparing direct and indirect benefits of crossovers and detours (full lane closures). This research examined the advantages and disadvantages of entirely closing one direction of traffic over traditional work zone techniques (such as partial lane closure through median crossover) from the perspectives of the agency, road users, and the community. In the case of full closure, the study (a) examined the alternative MOT strategies and best practices through an extensive literature review and survey of agencies (b) investigated risk, benefit, and costs associated with selected detour routes (c) validated the identified critical factors through case studies in Indiana and at other states, and (d) implemented best practices in an expected project to evaluate the safety, mobility, and cost benefits of closing one direction. Through the literature review and four case studies, eleven KPIs for MOT strategy developments were identified. This study prioritized these KPIs through the survey questionnaire. The top five KPIs are (1) safety, (2) mobility, (3) budget constraint, (4) project duration, (5) complexity of project sites. Based on these KPIs and other findings presented in Section 4.3.3, this study has proposed a comparison tool for predetermined MOT strategies in the form of a flow-chart. This tool is followed by the scores or weights associated with each KPI. These scores are normalized—i.e., the most important KPI which is safety, has the maximum weightage 1 and rest of the KPIs are weighed relatively. INDOT has a set of editable documents which are references for making MOT decisions. This proposed flow-chart tool will “walk” the INDOT team through the use of these spreadsheets corresponding to the identified KPIs through this study. It will be at the discretion of the INDOT team as to which KPIs are relevant to the situation at hand. Therefore, the flow-chart tool is flexible to incorporate the dynamic nature of MOT strategy selection.
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Wideman, Jr., Robert F., Nicholas B. Anthony, Avigdor Cahaner, Alan Shlosberg, Michel Bellaiche, and William B. Roush. Integrated Approach to Evaluating Inherited Predictors of Resistance to Pulmonary Hypertension Syndrome (Ascites) in Fast Growing Broiler Chickens. United States Department of Agriculture, December 2000. http://dx.doi.org/10.32747/2000.7575287.bard.
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Background PHS (pulmonary hypertension syndrome, ascites syndrome) is a serious cause of loss in the broiler industry, and is a prime example of an undesirable side effect of successful genetic development that may be deleteriously manifested by factors in the environment of growing broilers. Basically, continuous and pinpointed selection for rapid growth in broilers has led to higher oxygen demand and consequently to more frequent manifestation of an inherent potential cardiopulmonary incapability to sufficiently oxygenate the arterial blood. The multifaceted causes and modifiers of PHS make research into finding solutions to the syndrome a complex and multi threaded challenge. This research used several directions to better understand the development of PHS and to probe possible means of achieving a goal of monitoring and increasing resistance to the syndrome. Research Objectives (1) To evaluate the growth dynamics of individuals within breeding stocks and their correlation with individual susceptibility or resistance to PHS; (2) To compile data on diagnostic indices found in this work to be predictive for PHS, during exposure to experimental protocols known to trigger PHS; (3) To conduct detailed physiological evaluations of cardiopulmonary function in broilers; (4) To compile data on growth dynamics and other diagnostic indices in existing lines selected for susceptibility or resistance to PHS; (5) To integrate growth dynamics and other diagnostic data within appropriate statistical procedures to provide geneticists with predictive indices that characterize resistance or susceptibility to PHS. Revisions In the first year, the US team acquired the costly Peckode weigh platform / individual bird I.D. system that was to provide the continuous (several times each day), automated weighing of birds, for a comprehensive monitoring of growth dynamics. However, data generated were found to be inaccurate and irreproducible, so making its use implausible. Henceforth, weighing was manual, this highly labor intensive work precluding some of the original objectives of using such a strategy of growth dynamics in selection procedures involving thousands of birds. Major conclusions, solutions, achievements 1. Healthy broilers were found to have greater oscillations in growth velocity and acceleration than PHS susceptible birds. This proved the scientific validity of our original hypothesis that such differences occur. 2. Growth rate in the first week is higher in PHS-susceptible than in PHS-resistant chicks. Artificial neural network accurately distinguished differences between the two groups based on growth patterns in this period. 3. In the US, the unilateral pulmonary occlusion technique was used in collaboration with a major broiler breeding company to create a commercial broiler line that is highly resistant to PHS induced by fast growth and low ambient temperatures. 4. In Israel, lines were obtained by genetic selection on PHS mortality after cold exposure in a dam-line population comprising of 85 sire families. The wide range of PHS incidence per family (0-50%), high heritability (about 0.6), and the results in cold challenged progeny, suggested a highly effective and relatively easy means for selection for PHS resistance 5. The best minimally-invasive diagnostic indices for prediction of PHS resistance were found to be oximetry, hematocrit values, heart rate and electrocardiographic (ECG) lead II waves. Some differences in results were found between the US and Israeli teams, probably reflecting genetic differences in the broiler strains used in the two countries. For instance the US team found the S wave amplitude to predict PHS susceptibility well, whereas the Israeli team found the P wave amplitude to be a better valid predictor. 6. Comprehensive physiological studies further increased knowledge on the development of PHS cardiopulmonary characteristics of pre-ascitic birds, pulmonary arterial wedge pressures, hypotension/kidney response, pulmonary hemodynamic responses to vasoactive mediators were all examined in depth. Implications, scientific and agricultural Substantial progress has been made in understanding the genetic and environmental factors involved in PHS, and their interaction. The two teams each successfully developed different selection programs, by surgical means and by divergent selection under cold challenge. Monitoring of the progress and success of the programs was done be using the in-depth estimations that this research engendered on the reliability and value of non-invasive predictive parameters. These findings helped corroborate the validity of practical means to improve PHT resistance by research-based programs of selection.
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Elacqua, Gregory, Leidy Gómez, Thomas Krussig, Carolina Méndez, and Christopher Neilson. The Potential of Smart Matching Platforms in Teacher Assignment: The Case of Ecuador. Inter-American Development Bank, September 2022. http://dx.doi.org/10.18235/0004476.
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This paper studies the potential of personalized "smart" information interven- tions to improve teacher assignment results in the context of a centralized choice and assignment system (CCAS) in Ecuador. Specifically, we focus on the impact that a personalized non-assignment risk warning, coupled with a list of "achiev- able" teaching position recommendations, had on teacher applications in the “I Want to Become a Teacher” selection process. We study the causal effect of the intervention on teachers school choices, assessing its impact on the equilibrium probability of being assigned and on the overall results of the selection process, both in terms of the percentage of filled vacancies and the selection scores of as- signed teachers. We find that treated teachers, in equilibrium, are much more likely to modify their application and obtain an assignment. This result highlights the potential of similar information interventions in other contexts. We furthermore present evidence that the intervention led to increased overall assignment rates and selection scores.
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Elacqua, Gregory, Leidy Gómez, Thomas Krussig, Luana Marotta, Carolina Méndez, and Christopher Neilson. The Potential of Smart Matching Platforms in Teacher Assignment: The Case of Ecuador. Inter-American Development Bank, October 2022. http://dx.doi.org/10.18235/0004527.
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This paper studies the potential of personalized "smart" information interventions to improve teacher assignment results in the context of a centralized choice and assignment system (CCAS) in Ecuador. Specifically, we focus on the impact that a personalized non-assignment risk warning, coupled with a list of "achievable" teaching position recommendations, had on teacher applications in the “I Want to Become a Teacher” selection process. We study the causal effect of the intervention on teachers school choices, assessing its impact on the equilibrium probability of being assigned and on the overall results of the selection process, both in terms of the percentage of filled vacancies and the selection scores of as- signed teachers. We find that treated teachers, in equilibrium, are much more likely to modify their application and obtain an assignment. This result highlights the potential of similar information interventions in other contexts. We furthermore present evidence that the intervention led to increased overall assignment rates and selection scores.
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Boettcher, Seth J., Courtney Gately, Alexandra L. Lizano, Alexis Long, and Alexis Yelvington. Part 3: Case Study Appendices to the Technical Reports. Edited by Gabriel Eckstein. Texas A&M University School of Law Program in Natural Resources Systems, May 2020. http://dx.doi.org/10.37419/eenrs.brackishgroundwater.p3.
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This Case Study Appendix to the Technical Reports expands on regulations in San Antonio and El Paso where these water alternatives are in place. The goal of this report is to provide insight into the legal and regulatory barriers, challenges, and opportunities for these technologies to go online. Each desalination and water recycling faciality implementation site must comply with various laws and regulations. The information in these Case Studies comes from the study of brackish groundwater desalination and water recycling facilities currently operating in Texas. While there is no updated “one-stop-shop” resource where a municipal leader can find a list of all the necessary permits to build, operate, and maintain such facilities, this Technical Report aims to compile the existing, available information in an organized and accessible fashion. The Desalination Technical report is the third in a series of three reports which make up the Project. These reports examine regulations surrounding desalination and water recycling. The companion reports generally highlight building, operating, and monitoring requirements for water recycling facilities in Texas.
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Lers, Amnon, Majid R. Foolad, and Haya Friedman. genetic basis for postharvest chilling tolerance in tomato fruit. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7600014.bard.
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ABSTRACT Postharvest losses of fresh produce are estimated globally to be around 30%. Reducing these losses is considered a major solution to ensure global food security. Storage at low temperatures is an efficient practice to prolong postharvest performance of crops with minimal negative impact on produce quality or human health and the environment. However, many fresh produce commodities are susceptible to chilling temperatures, and the application of cold storage is limited as it would cause physiological chilling injury (CI) leading to reduced produce quality. Further, the primary CI becomes a preferred site for pathogens leading to decay and massive produce losses. Thus, chilling sensitive crops should be stored at higher minimal temperatures, which curtails their marketing life and in some cases necessitates the use of other storage strategies. Development of new knowledge about the biological basis for chilling tolerance in fruits and vegetables should allow development of both new varieties more tolerant to cold, and more efficient postharvest storage treatments and storage conditions. In order to improve the agricultural performance of modern crop varieties, including tomato, there is great potential in introgression of marker-defined genomic regions from wild species onto the background of elite breeding lines. To exploit this potential for improving tomato fruit chilling tolerance during postharvest storage, we have used in this research a recombinant inbred line (RIL) population derived from a cross between the red-fruited tomato wild species SolanumpimpinellifoliumL. accession LA2093 and an advanced Solanum lycopersicumL. tomato breeding line NCEBR-1, developed in the laboratory of the US co-PI. The original specific objectives were: 1) Screening of RIL population resulting from the cross NCEBR1 X LA2093 for fruit chilling response during postharvest storage and estimation of its heritability; 2) Perform a transcriptopmic and bioinformatics analysis for the two parental lines following exposure to chilling storage. During the course of the project, we learned that we could measure greater differences in chilling responses among specific RILs compared to that observed between the two parental lines, and thus we decided not to perform transcriptomic analysis and instead invest our efforts more on characterization of the RILs. Performing the transcriptomic analysis for several RILs, which significantly differ in their chilling tolerance/sensitivity, at a later stage could result with more significant insights. The RIL population, (172 lines), was used in field experiment in which fruits were examined for chilling sensitivity by determining CI severity. Following the field experiments, including 4 harvest days and CI measurements, two extreme tails of the response distribution, each consisting of 11 RILs exhibiting either high sensitivity or tolerance to chilling stress, were identified and were further examined for chilling response in greenhouse experiments. Across the RILs, we found significant (P < 0.01) correlation between field and greenhouse grown plants in fruit CI. Two groups of 5 RILs, whose fruits exhibited reproducible chilling tolerant/sensitive phenotypes in both field and greenhouse experiments, were selected for further analyses. Numerous genetic, physiological, biochemical and molecular variations were investigated in response to postharvest chilling stress in the selected RILs. We confirmed the differential response of the parental lines of the RIL population to chilling stress, and examined the extent of variation in the RIL population in response to chilling treatment. We determined parameters which would be useful for further characterization of chilling response in the RIL population. These included chlorophyll fluorescence Fv/Fm, water loss, total non-enzymatic potential of antioxidant activity, ascorbate and proline content, and expression of LeCBF1 gene, known to be associated with cold acclimation. These parameters could be used in continuation studies for the identification and genetic mapping of loci contributing to chilling tolerance in this population, and identifying genetic markers associated with chilling tolerance in tomato. Once genetic markers associated with chilling tolerance are identified, the trait could be transferred to different genetic background via marker-assisted selection (MAS) and breeding. The collaborative research established in this program has resulted in new information and insights in this area of research and the collaboration will be continued to obtain further insights into the genetic, molecular biology and physiology of postharvest chilling tolerance in tomato fruit. The US Co-PI, developed the RIL population that was used for screening and measurement of the relevant chilling stress responses and conducted statistical analyses of the data. Because we were not able to grow the RIL population under field conditions in two successive generations, we could not estimate heritability of response to chilling temperatures. However, we plan to continue the research, grow the RIL progeny in the field again, and determine heritability of chilling tolerance in a near future. The IS and US investigators interacted regularly and plan to continue and expand on this study, since combing the expertise of the Co-PI in genetics and breeding with that of the PI in postharvest physiology and molecular biology will have great impact on this line of research, given the significant findings of this one-year feasibility project.
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Aly, Radi, James H. Westwood, and Carole L. Cramer. Novel Approach to Parasitic Weed Control Based on Inducible Expression of Cecropin in Transgenic Plants. United States Department of Agriculture, May 2003. http://dx.doi.org/10.32747/2003.7586467.bard.
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Our overall goal was to engineer crop plants with enhanced resistance to Orobanche (broomrape) based on the inducible expression of sarcotoxin-like peptide (SLP). A secondary objective was to localize small proteins such as SLP in the host-parasite union in order to begin characterizing the mechanism of SLP toxicity to Orobanche. We have successfully accomplished both of these objectives and have demonstrated that transgenic tobacco plants expressing SLP under control of the HMG2 promoter show enhanced resistance to O. aegyptiaca and O. ramosa . Furthermore, we have shown that proteins much larger than the SLP move into Orobanche tubercles from the host root via either symplastic or apoplastic routes. This project was initiated with the finding that enhanced resistance to Orobanche could be conferred on tobacco, potato, and tomato by expression of SLP (Sarcotoxin IA is a 40-residue peptide produced as an antibiotic by the flesh fly, Sarcophaga peregrina ) under the control of a low-level, root-specific promoter. To improve the level of resistance, we linked the SLP gene to the promoter from HMG2, which is strongly inducible by Orobanche as it parasitizes the host. The resulting transgenic plants express SLP and show increased resistance to Orobanche. Resistance in this case is manifested by increased growth and yield of the host in the presence of the parasite as compared to non-transgenic plants, and decreased parasite growth. The mechanism of resistance appears to operate post-attachment as the parasite tubercles attached to the transgenic root plants turned necrotic and failed to develop normally. Studies examining the movement of GFP (approximately 6X the size of SLP) produced in tobacco roots showed accumulation of green fluorescence in tubercles growing on transformed plants but not in those growing on wild-type plants. This accumulation occurs regardless of whether the GFP is targeted to the cytoplasm (translocated symplastically) or the apoplastic space (translocated in xylem). Plants expressing SLP appear normal as compared to non-transgenic plants in the absence of Orobanche, so there is no obvious unintended impact on the host plant from SLP expression. This project required the creation of several gene constructs and generation of many transformed plant lines in order to address the research questions. The specific objectives of the project were to: 1. Make gene constructs fusing Orobanche-inducible promoter sequences to either the sarcotoxin-like peptide (SLP) gene or the GFP reporter gene. 2. Create transgenic plants containing gene constructs. 3. Characterize patterns of transgene expression and host-to-parasite movement of gene products in tobacco ( Nicotiana tabacum L.) and Arabidopsis thaliana (L.). 4. Characterize response of transgenic potato ( Solanum tuberosum L.) and tomato ( Lycopersicon esculentum Mill .) to Orobanche in lab, greenhouse, and field. Objectives 1 and 2 were largely accomplished during the first year during Dr. Aly's sabbatical visit to Virginia Tech. Transforming and analyzing plants with all the constructs has taken longer than expected, so efforts have concentrated on the most important constructs. Work on objective 4 has been delayed pending the final results of analysis on tobacco and Arabidopsis transgenic plants. The implications of this work are profound, because the Orobanche spp. is an extremely destructive weed that is not controlled effectively by traditional cultural or herbicidal weed control strategies. This is the first example of engineering resistance to parasitic weeds and represents a unique mode of action for selective control of these weeds. This research highlights the possibility of using this technique for resistance to other parasitic species and demonstrates the feasibility of developing other novel strategies for engineering resistance to parasitic weeds.
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Chung, Seung Min, Yoo Jin Choo, and Min Cheol Chang. Effect of perfluoroalkyl and polyfluoroalkyl substances on stroke incidence: systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, November 2022. http://dx.doi.org/10.37766/inplasy2022.11.0102.
Full textAbstract:
Review question / Objective: We aimed to investigate the association between exposure to perfluoroalkyl and polyfluoroalkyl substances (PFAS) and the occurrence of stroke. Eligibility criteria: We applied the following inclusion criteria for selection of the studies: (1) an observational studies including cohort, cross-sectional, or case-control studies; (2) exposure to at least one PFAS observed; (3) assessment of odds ratio (OR), relative risk (RR), or incidence rate of stroke per 1-log unit increase of PFAS. The exclusion criteria were as follows: (1) case reports and reviews; (2) duplicate publications of the same cohort; and (3) no data on the OR, RR, or incidence of stroke.