16 research outputs found
A comprehensive analysis of secondary air pollutants affecting a semi-arid coastal urban airshed in South Texas
No full textCorpus Christi is a growing industrialized urban airshed located along the Gulf of Mexico in South Texas. The urban airshed is currently in attainment with ozone and PM2.5 national ambient air quality standards (NAAQS); however, spatial and temporal variabilities were noted. Stringent revisions are being proposed by the U. S. Environmental Protection Agency (EPA) to ozone and PM2.5 NAAQS. Thus, considering the emerging new unconventional emissions sources, the primary objective of this study was to assess ozone and PM2.5 pollution in the urban airshed using concentrations measured from 2010 to 2014. During high ozone days, (daily maximum 8- hr ozone concentrations >=75 ppb) influence of long-range transport from Eagle Ford Shale region, Industrialized cities of Texas including Houston-Galveston, Dallas-Fort Worth, and surrounding regions including Louisiana, Ohio River Valley, and lower Mississippi was observed. Source apportionment analysis of PM2.5 speciation data resolved optimal solution of nine sources with secondary sulfates to be the major contributor (non-sea salt – 23%, aged – 19%) accounting for 42%. In addition to local sources an influence of long-range transport from Central America and Mexico to biomass burns (11%) during spring months, a sub-Saharan region of Africa to crustal dust (14%) during summer months, and haze transport to secondary sulfates from upwind polluted regions during fall months was concluded. The results of this study provide an understanding of commonality in sources contributing to elevated ozone and PM2.5 concentrations. The study also provides knowledge on source categories, contributions required in identifying major contributors and implementing effective emission control strategies
SOURCE APPORTIONMENT ANALYSIS OF MEASURED FINE PARTICULATE MATTER IN A SEMI-ARID URBAN AIRSHED IN CORPUS CHRISTI, U.S.A
No full textSources Affecting PM₂̣ ₅ Concentrations at a Rural Semi-Arid Coastal Site in South Texas
No full textThis article employs an advanced factor analysis technique with principal component analysis/absolute principal component scores and positive matrix factorization to apportion the sources influencing the PM₂̣ ₅ levels measured during 2003 through 2005 at a rural coastal site located within the Corpus Christi urban airshed in South Texas
Source apportionment of fine particulate matter measured in an industrialized coastal urban area of South Texas
No full textSource Characterization of Volatile Organic Compounds Affecting the Air Quality in a Coastal Urban Area of South Texas
No full textSelected Volatile Organic Compounds (VOC) emitted from various anthropogenic sources including industries and motor vehicles act as primary precursors of ozone, while some VOC are classified as air toxic compounds. Significantly large VOC emission sources impact the air quality in Corpus Christi, Texas. This urban area is located in a semi-arid region of South Texas and is home to several large petrochemical refineries and industrial facilities along a busy ship-channel. The Texas Commission on Environmental Quality has setup two continuous ambient monitoring stations (CAMS 633 and 634) along the ship channel to monitor VOC concentrations in the urban atmosphere. The hourly concentrations of 46 VOC compounds were acquired from TCEQ for a comprehensive source apportionment study. The primary objective of this study was to identify and quantify the sources affecting the ambient air quality within this urban airshed. Principal Component Analysis/Absolute Principal Component Scores (PCA/APCS) was applied to the dataset. PCA identified five possible sources accounting for 69% of the total variance affecting the VOC levels measured at CAMS 633 and six possible sources affecting CAMS 634 accounting for 75% of the total variance. APCS identified natural gas emissions to be the major source contributor at CAMS 633 and it accounted for 70% of the measured VOC concentrations. The other major sources identified at CAMS 633 included flare emissions (12%), fugitive gasoline emissions (9%), refinery operations (7%), and vehicle exhaust (2%). At CAMS 634, natural gas sources were identified as the major source category contributing to 31% of the observed VOC. The other sources affecting this site included: refinery operations (24%), flare emissions (22%), secondary industrial processes (12%), fugitive gasoline emissions (8%) and vehicle exhaust (3%)
Environmental histories and planning conflicts in East Boston
No full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Thesis: M.C.P., Massachusetts Institute of Technology, Department of Urban Studies and Planning, 2019Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 100-109).Places are steeped in individual and collective memory. Places and their features become symbols which joy, grief, belonging and change: a beautiful park is a bitterly fought victory, a dilapidated playground a symbol of neglect, a looming condominium complex a represented betrayal. In reality, there are no neutral objects. A neighborhood is not simply an artful arrangement of homes, streets, parks, schools or shops. In reality, is composed of the stories residents tell. Residents of East Boston's Eagle Hill neighborhood currently oppose the siting of a proposed electrical substation on the banks of Chelsea Creek. The site is located next to a children's playground and waterfront parkland. Residents worry about the potential impacts of flooding on the site and effects of the substation on quality of life. East Boston and Chelsea are both immigrant and working-class communities.Both share deep memories and experiences of industrial and environmental burdens that are imposed on the area and the ways in which infrastructure convey siting and planning processes have imperiled them and their communities. The list of these burdens is long, and includes the noise and pollution from Logan Airport, the jet fuel, salt and heating oil stored alongside Chelsea Creek, and pollution from freeways and trucking from Expressway 1A. However, the public process by which utility companies site energy infrastructure is highly technical and standardized, and does not leave space for residents to describe these burdens and tell these context-specific stories. I interviewed residents, reviewed public record and media sources in order to characterize the types of histories in the minds of residents.I then produced four short vignettes with accompanying photo essays which describe public process, East Boston and the Massachusetts Port Authority, the industrial history of Chelsea Creek, and the future of East Boston, luxury development and climate change. Each of these vignettes inform how residents understand this current conflict, and reflect some of the inequalities and contradictions embedded in post-industrial Boston.by Saritha Ramakrishna.M.C.P.M.C.P. Massachusetts Institute of Technology, Department of Urban Studies and Plannin
Preparation Of Fiber Enriched Low Fat Spread
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Profiling of microbial metabolites for discovering enzyme inhibitor
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Mapping Regional Disparities in Human Development- The Case of Erstwhile Andhra Pradesh
No full textAbstractCensus 2011 marked erstwhile Andhra Pradesh as the second largest and fifth most populous state of India housing 7% of its total population. In 2014, it was divided into the two states of Telangana and Andhra Pradesh on the basis of disparities in resource allocation. Mapping regional disparities can aid in effective policy-making at the preliminary stage of planning itself. This paper aims to study the regional disparities in human development in the case of erstwhile Andhra Pradesh through the tool of graduated colour mapping. Indicators mapped were drawn from the Andhra Pradesh Human Development Report of 2007. The studies reveal that while there is a clear case of polarized growth in the case of Hyderabad and its immediate surroundings, we also find similar trends in the Vizianagaram district, as well as in the Rayalseema region
Applying the Hedonic Estimation Method to South Mountain Municipal Park
No full textabstract: South Mountain is the largest municipal park in the nation. It is a bundled amenity, providing a series of linked services to the surrounding communities. A dataset of 19,209 homes in 155 neighborhoods within three miles of the park was utilized in order to complete a hedonic estimation for two nearby urban villages, Ahwatukee Foothills and South Mountain Village. Measures of access include proximity to the park, trailhead access, and adjacency to the park. Two regressions were estimated, the first including lot characteristics and subdivision fixed effects and the second using the coefficients for each subdivision as the dependent variable. These estimates describe how the location of a house in a subdivision contributes to its conditional mean price. As a result they offer a direct basis for capturing amenities measured at the neighborhood scale on home values. Park proximity, trailhead access and adjacency were found to significantly influence the price of homes at the 5% confidence level in Ahwatukee, but not in South Mountain Village. The results of this study can be applied to issues of environmental justice and park access in determining which areas and attributes of the park are associated with a high premium. Though South Mountain was preserved some time ago, development and future preservation in the City of Phoenix can be informed by such studies
