212 research outputs found
Availability of Silica in Dusts at different operations locations in Limestone Quarry in Ewekoro, Nigeria
No full textThe dusts from mines and quarries have been reported to induce respiratory problems among mineral workers. This study was carried out to investigate the availability of free silica in the dust from different parts of the quarry with different activities. The blasted, boreholes and stacked sites were investigated. The collected dust was analyzed using an X-Ray analyzer. The result shows that the highest free silica content (mean of 22.279%) was found in dusts from borehole, followed by blasted parts (17.195%). The stacked shows the least mean (7.566%). The statistical analysis carried out on the result using SPSS software shows that there is statistical independence of the dust from different sections of the quarry, meanwhile the values of the means are environmentally significant. The recommendations were made on how to control the negative effect of the free silica in every aspect of the quarry with emphasis on borehole drilling section
Petrophysical Characterization Of Reservoir And Oil Properties As A Tool For Choosing Optimal Enhanced Oil Recovery Methods: Case Study Of Dawson Bay Formation, Divide County, North Dakota, United States
No full textIn unconventional reservoirs, i.e., shaly or tight sand formations, with low porosity and very low permeability, the oil recovery factor is low hence enhanced oil recovery is important. In the conventional reservoirs, once the primary and secondary stages of recovery are exhausted, about two-thirds of the original oil in place is left behind. Enhanced Oil Recovery aims to recover the remaining oil (Green and Wilhite, 1998). These makes the enhanced oil recovery to be of great importance. Efforts are always in place to see how the system can be improved.
The study was carried out to describe the overview of rock types, depositional environment and diagenetic history of the Dawson Bay Formation, and overview of structural geology of the Dolphin Field by studying the Well logs and Cores from the drilled wells, thin sections and using computer softwares i.e. Neuralog, Petra, Surfer. The petrophysical properties of the formation in the field i.e., rock type, porosity, average permeability, oil saturation, production depth, net thickness, temperature and Oil properties, i.e., API gravity, viscosity, oil composition were determined in the laboratory by experiments including Nuclear Magnetic Resonance (NMR) and careful observations of the well logs, and well logs processing using Neuralog, Petra and Artificial Neural network of Matlab. The validity of Screening Criteria by Taber et al. (1997) which recommends Enhanced Oil Recovery Method(s) for formations based on the petrophysical properties for Dawson Bay Formation in Divide County, North Dakota and the optimal method of Enhanced Oil Recovery for the Dawson Bay Formation in Divide County, North Dakota which has its own distinct petrophysical properties and oil properties at laboratory scale at laboratory scale was investigated by conducting Surfactant and brine concentrations spontaneous imbibition experiments, Carbon Dioxide flooding tests, and Carbon Dioxide ‘Huff n Puff’ simulation tests using Computer Modelling Group (CMG) STARS software.
The result of the study shows that the reservoir rock, predominantly dolomite, slightly limestone, thickens from about 10 ft to about 100 ft. It’s thick at the mid-eastern part of the field and thins sideways. This may likely suggest the topography of the marine environment where the limestone was deposited before it was characterized by diagenesis for hydrocarbon accumulation. The oil producing wells are on Nesson Anticline, the reservoir trap has a structural element. Since no clear closure was seen on the structure of the field, reservoir trap may be attributed to halite plugs in the dolomite rock, making it more stratigraphic than structural. The values of the petrophysical properties of the formation obtained from log analysis deviate from values from core analysis. The correlation value was also too low for a reliable relationship. The correlational coefficient for depth 9917 to 9932 ft with 0.5 ft incremental for Well 12071 is about -0.1932, which shows a poor relationship. Artificial Neutral Network (ANN) was used to establish the relationship which can be used to predict the actual petrophysical properties of the formation in other wells. The EOR screening method from Taber et al. (1997) is to a good extent applicable to the Dawson Bay Formation, Dolphin Field. Surfactant flooding and CO2-EOR methods are applicable to the formation based on experimental results and CO2 numerical simulation. The brine, surfactant and CO2 flooding will improve oil recovery from the formation though in varying degrees. The surfactant gave the highest yield of all from experimental results. The prevailing economics, cost of surface and injection plants, environmental among other considerations will influence the method to be used eventually at a time of execution of EOR operation
A comparative analysis of the ideological orientation of select black integrationist and black nationalist groups in the U.S.: toward the role of black social workers, 1987
No full textThis study examines the ideological orientation of various African-American groups on the question of black liberation. It is an effort to provide an Afrocentric frame of reference for black liberation, from which black social workers can develop appropriate problem solving strategies and techniques to address the African-American condition. The empirical referents for this study is directed by a comparative analysis of data collected from organizational documents of the groups examined and other related secondary data. The major findings suggest that there exist a positive relationship between Black Nationalist oriented groups and the theoretical framework for black liberation. The study concludes that this relationship is significant to social work practice in the African-American community
Homicide in the United States Of America: 1980 through 1990, 1992
No full textMedia accounts and a number of researchers have argued that homicide is the most serious crime and among the ten leading causes of death in the United States for people 35 to 54 years of age. For men and women 15 to 34, it is among the four leading causes of death. Homicide is also one of the five leading causes of death in early childhood in the United States, which has the second highest child homicide rate in the world. The drama of violent death has been a favorite literary theme from the time of Homer's Iliad to the present day. Homicides have, however, far greater significance socially than as source material for writers. Yet in the United States its wider significance has received scant attention from sociologists. This study examines the homicide rate over time in the United States by sex, age and race as ascertained from the Uniform Crime Reports. Additionally, secondary data from the scholarly literature on homicide is analyzed. Particular attention focuses on theories of homicide and research studies supporting these theories; that is, as found in the scholarly criminological literature (journal articles, books, manuscripts, documents). Findings disclose that causal theories and research studies fall into two chief categories: (1) psychological explanations and (2) sociologicalexplanations
DETERMINANTS OF INFLATION IN NIGERIA: A CO- INTEGRATION APPROACH
No full textInflation is undeniable one of most leading and dynamics macroeconomics issues confronting almost all economies of the world. Its dynamism has made it an imperative issue to be considered. Hence the study examines the factors affecting inflation in Nigeria. Time series data were employed for the study. The data was sourced from the Central Bank of Nigeria and National Bureau of Statistics. Descriptive statistics and cointegration analysis were the analytical tools used. It was observed that there were variations in the trend pattern of inflation rate. Some of the variables considered were significant in determining inflation in Nigeria. The previous total export was found to have a negative impact on current inflation while the previous total import exerts a positive effect likewise the food price index. It has thus been recommended that policies that will set the interest rate to a level at which it will encourage investment and increase in production level could be institutionalized, importation should be reduced in Nigeria such that it will not encourage change of consumer taste resulting to inflating prices, exchange rate system should be maintained at a level that will not impose threat on the Nigeria economy and the domestic consumption of petroleum product should be focused, not only exportation.Financial Economics,
Stroke pattern and outcome of management in type 2 diabetics in a tertiary hospital in North Western Nigeria
No full textBackground: Diabetes mellitus is a well-recognized risk factor for stroke. Clinical features, as well as outcome of stroke, difference between diabetic and nondiabetic patients. The objective of this study is to determine the pattern and outcome of management in diabetes-stroke co-morbidity. Materials and Methods: This is a retrospective study where case folders of patient admitted from January 1 to December 31, 2009 with the clinical diagnosis of stroke were traced. A questionnaire was used to extract relevant data from case folders. Results: A total of 115 patients with the clinical diagnosis of stroke were admitted during the study period, but only 88 had complete information out of which 12 (13.6%) had type 2 diabetes. The mean age of the diabetic group (69.67 ± 12.7 years) was found to be significantly higher than that of the nondiabetic group (56.93 ± 16.06 years) (t = 2.615, P = 0.011). Ischemic stroke occurred more frequently in the diabetes stroke the co-morbid group. However, the difference was not statistically significant (χ2 =0.079, P = 0.540). Outcome in terms of neurological recovery tended to be poor in the diabetes-stroke co-morbid group as compared to the nondiabetes stroke group (χ2 =13.93, P = 0.006). Conclusion: Stroke pattern and outcomes are different in the diabetic patient compared to nondiabetic patient. There is more prevalence of ischemic stroke in the diabetic group of patients often with slow recovery
Migration of Nigerians to Canada for higher education:: Student visa as a pathway to permanent residence
No full textThis study investigates the motivation for Nigerian migration to Canada for undergraduate education, with a focus on parent-sponsored undergraduate Nigerian students in Canadian universities. Using a qualitative research methods approach, the study shows that middle-class and upper-class Nigerians send their children to Canadian universities for undergraduate education because the student visa provides employment opportunities for international students, during and after studies, and Canadian permanent residence upon graduation. It is demonstrated in the paper that migration for higher education fits the neoliberal agenda of the current Canadian immigration policies and practices that target “designer im/migrants,” that is, im/migrants that are young, skilled, highly productive, educated, and self-sufficient. It is claimed throughout the paper that migration for higher education is not fortuitous for the parents and their wards and the Canadian state, as higher tuition paid by international students augments the declining public funding of post-secondary institutions in Canada and avails international students the opportunity of employment and permanent residence in Canada. The study in essence reveals the contradiction in the claim that the neoliberal state is a neutral entity as evidence shows that Canada’s post-secondary institutions implement neoliberal programs with the aid of the Canadian state
Pitch Polarity in Praise Singing and Hip-Hop: Evidence for an Underrepresented Poetic Feature
No full textTonal counterpoint is a common device in the oral improvisatory tradition of Yorb ork (praise-singing), first documented by Olatunji (1984). Both tonal and counterpoint are terms familiar to musicians, but the meaning here is the linguistic tonal, not the harmonic, and the rhetorical counterpoint, not polyphonic. Olatunji describes couplets in which each phrase is parallel if not identical in terms of phonic content and the first sets up a tonal expectancy for the second. The contrast might also be between words within a single phrase. There are three primary categories of tonal counterpoint in Yoruba: parallelism of similar words; homophone change; and non-lexical contrast providing paralinguistic affect. Through the application of computational analysis to a broad corpus, we provide substantial documentation for a phenomenon that may be as ubiquitous in Africana (Black) vocal arts as rhyming is in Indo-European cultures. This presentation incorporates concepts from music theory and linguistics with signal processing techniques to analyze a newly gathered and annotated corpus of recorded music. Keywords: African Languages and Societies; Audio Arts and Acoustics; Digital Humanities; Ethnomusicology; Music Performance; Music Theory; Other Theatre and Performance Studies; Performance Studies; Poetry
Effect of the rock dimension on surfactant imbibition rate in the Middle Member of Bakken: Creating a model for frac design
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