Constraining Gluon Shadowing Using Photoproduction in Ultraperipheral pA and AA Collisions

Photoproduction of heavy quarks and exclusive production of vector mesons in ultraperipheral proton-nucleus and nucleus-nucleus collisions depend significantly on nuclear gluon distributions. In the present study we investigate quantitatively the extent of the applicability of these processes at the Large Hadron Collider (LHC) in constraining the shadowing component of nuclear gluon modifications.Comment: 15 pages, 10 figures. arXiv admin note: substantial text overlap with arXiv:1104.428

Nuclear effects in photoproduction of heavy quarks and vector mesons in ultraperipheral PbPb and pPb collisions at the LHC

The comparison of photoproduction cross sections for $c\bar{c}$ and b-b(bar) in PbPb and pPb collisions can give sensitivity to nuclear shadowing effects. The photoproduction of vector mesons is even more sensitive to the underlying gluon distributions. In this study we present the cross sections and rapidity dependence of the photoproduction of heavy quarks and exclusive production of vector mesons in ultraperipheral pPb and PbPb collisions at the Large Hadron Collider at sqrt(s_NN)=5 TeV and sqrt(s_NN)=2.76$TeV, respectively. The potentials of using these processes for constraining nuclear gluon shadowing are explored. It is found that photoproduction of$J/\psi$and$\Upsilon$ in PbPb collisions in particular exhibit very good sensitivity to gluon shadowing.Comment: 4 pages, 4 figure

Examining Nigerian Banking Governance, Leadership Style, and Performance During the Financial Crisis

The 2008–2009 global financial crisis of financial systems negatively affected about 30% of Nigerian banks, leading to profitability issues. The profitability issues led to operational challenges, downsizing, and liquidation of some banks. The purpose of this correlational study was to examine the relationship between corporate governance structure, perception of leadership style, and bank performance. This study was grounded in agency theory and used survey and archival data. Survey data were collected from 11 participants employed by commercial banks located in Nigeria, using the Multifaceted Leadership Questionnaire. Corporate governance and bank performance data were collected from annual bank reports. The model as a whole was not able to significantly predict bank performance, F(2,11,) = .361, p = .708, R2 = .083. There was no relationship between corporate governance structure, employees’ perception of leadership style of bank leaders, and performance of banks. The social impact for this study is that a lack of corporate governance structures can lead to bank failures. The findings from this study may be valuable to bank executives and employees. However, the findings do not suggest that corporate governance should not be practiced in organizations. When corporate governance is practiced in organizations it strengthens the structure of the banks. The results of this study are designed to be of interest to bank leaders who need to understand the relationship between corporate governance structure, employees’ perception of leadership styles, and bank performance

Examining Nigerian Banking Governance, Leadership Style, and Performance During the Financial Crisis

The 2008–2009 global financial crisis of financial systems negatively affected about 30% of Nigerian banks, leading to profitability issues. The profitability issues led to operational challenges, downsizing, and liquidation of some banks. The purpose of this correlational study was to examine the relationship between corporate governance structure, perception of leadership style, and bank performance. This study was grounded in agency theory and used survey and archival data. Survey data were collected from 11 participants employed by commercial banks located in Nigeria, using the Multifaceted Leadership Questionnaire. Corporate governance and bank performance data were collected from annual bank reports. The model as a whole was not able to significantly predict bank performance, F(2,11,) = .361, p = .708, R2 = .083. There was no relationship between corporate governance structure, employees’ perception of leadership style of bank leaders, and performance of banks. The social impact for this study is that a lack of corporate governance structures can lead to bank failures. The findings from this study may be valuable to bank executives and employees. However, the findings do not suggest that corporate governance should not be practiced in organizations. When corporate governance is practiced in organizations it strengthens the structure of the banks. The results of this study are designed to be of interest to bank leaders who need to understand the relationship between corporate governance structure, employees’ perception of leadership styles, and bank performance

Estimation of Global Solar Radiation in Ibadan, Nigeria using Angstrom - Prescott and Glover - Mcculloch’s Model

In this study, the data of mean daily bright sunshine hour for Ibadan was obtained from the International Institute of Tropical Agriculture (IITA) at Ibadan. It was used to estimate the monthly mean global solar radiation for Ibadan (latitude and longitude ). The data considered were for a period of 2008 to 2012. Angstrom-Prescott, and Glover & McCulloch’s Models were then used to estimate the mean monthly global solar radiation at Ibadan based on the monthly mean bright sunshine hour data of Ibadan. A new sunshine based model is also proposed to estimate global solar radiation at Ibadan for a period of five years (2008 – 2012). The performance of the models are evaluated by some statistical analysis like mean bias errors, root mean square error, mean percentage error, Nash- Sutcliffe error and coefficient of correlation in order to know the most suitable model. It was discovered that the month of August is the least amount of measured global solar radiation averaged for five years (2008 – 2012) at Ibadan is 9.77kW/m2. The most suitable model for Ibadan is Model 2 (Glover & McCulloch’s Model). The results obtained were validated with data of monthly mean global solar radiation data for Ibadan, obtained from the International Institute of Tropical Agriculture, Ibada

Challenges of soil- transmitted Helminthiasis in some communities in Ondo state, Nigeria

Soil- transmitted helminthiasis is a common public health challenge of developing countries. It has largely contributed in undermining the health status of people and hence jeopardized the economic development of countries concerned. This study aimed at investigating the burden of soil-transmitted helminthiasis in some selected rural communities in Ondo State Nigeria. This study was carried out to determine the prevalence of human soil-transmitted helminthiasis. Stool samples were collected and processed using stool concentration - formalin-ether sedimentation method. Out of the 928 samples collected from volunteers, 149 (16.05%) were infected. The following parasites were isolated: Ascaris lumbricoides, 103(53.7%) 64(33.3%), Trichuris trichiura 17(8.9%) and Strongyloides stercoralis 8(4.17%). Among the risk factors, toilet and water resource facilities were the major sources of transmission. The result obtained justifies the current state of the poor hygiene level in relation to the high occurrence rate of Soil-transmitted helminths among people living in rural settings

AFTERMATHS OF INFIDELITY AS EXPRESSED BY LITERATE WORKING CLASS WOMEN IN LAGOS STATE, NIGERIA

Background and Purpose: Globally, many married adults engage in infidelity. However, the repercussions of the act appear not palatable for couples, their children and the society at large. This study therefore, investigated the aftermaths of infidelity as expressed by literate working class women in Lagos State. The study also examined whether age and type of marriage would affect the respondents’ views.   Methodology: The descriptive design was adopted for this study. A total of 300 literate working class women were drawn from the target population using purposive and simple random sampling techniques. A researcher-developed questionnaire tagged Aftermaths of Infidelity (AIQ) was used to collect data. The instrument was validated by five experts in Nigeria and Nusantara while its reliability was established through test re-test reliability method and a coefficient of 0.74 was gotten. The data collected were analyzed using t-test and Analysis of Variance (ANOVA) at 0.05 level.   Findings: Results showed that divorce, unhappiness, contact of sexually transmitted diseases, emotional disability, hatred in the family, unwanted pregnancy, distrust and suspicion in the family, psychological trauma in children, and giving birth to illegitimate children are some of the aftermaths of infidelity as expressed by the literate working class women. Similarly, age and marriage type did not influence the expression of literate working class women in Lagos State on infidelity.   Contributions: Infidelity has devastating aftermaths. Counsellors should enlighten couples on the aftermaths of infidelity; they should enlighten them on the negative effects which infidelity has on the home, children and the society in general.   Keywords: Aftermath, infidelity, literate working class women, Lagos State, Nigeria.   Cite as: Odebode, A. A., James, J. F., Adegunju, K. A., & Julia, J. (2021). Aftermaths of infidelity as expressed by literate working class women in Lagos State, Nigeria.  Journal of Nusantara Studies, 6(2), 41-57. http://dx.doi.org/10.24200/jonus.vol6iss2pp41-5

INFLUENCE OF GRANITE-GRAVEL COMBINATION ON THE STRENGTH OF SELF-COMPACTING CONCRETE: TOWARDS A SUSTAINABLE CONSTRUCTION MATERIAL

This study focusses on the influence of granite-gravel (washed and unwashed) combination as coarse aggregate on hardened properties of Self-Compacting Concrete (SCC). Granite-gravel combination in varying percentages was used as coarse aggregates to produce SCC while other concrete constituents were kept constant. The experiments executed on hardened SCC were compressive and split tensile strength. Concrete were made using 150 mm cubes and 100 mm × 200 mm cylinders. Data obtained were analysed using graphical illustrations while Minitab was used to model values for the mix proportions. The compressive strength of SCC produced reliable results with a minimum strength of 30.96 N/mm² for 50% washed gravel at 28 days of which, the strength also increases as curing age increased. The split tensile strength of SCC increases as the curing day increased but decreased as gravel content increased with 50/50 threshold limit. The Surface plots analysis shows that the percentage increase of granite-washed gravel combination as coarse aggregate and curing ages in SCC has significant impact on compressive strength. It can be concluded that granite/gravel combination as coarse aggregates in SCC production is feasible and reliable provided the threshold limits of 50% washed gravel and 30% unwashed gravel are not exceeded

EXPERIMENTAL STUDY ON THE DURABILITY TO SALINE ENVIRONMENTS OF SELF-COMPACTING CONCRETE MADE WITH COARSE AGGREGATES COMBINATION

This study focus on durability to saline environments of self-compacting concrete (SCC) made of granite-gravel combination as coarse aggregates in concrete production. In this study fine aggregates, water, superplasticizer and cement were kept constant. The percentages replacement of gravel in place of granite aggregates were 10, 20, 30, 40, and 50, while 100% granite serves as control. A total of 162 cubes of 100 100 100 mm concrete specimens were immersed over the initial curing in a water container and further cured in 5% sodium chloride (NaCl) and sodium carbonate (Na2CO3) solutions for 28, 56 and 91 days in line with ASTM C39 (2003). The tests results indicate that concrete cured in five percent (5%) of NaCl solution have compressive strength accelerating properties at early age that could not be sustained for long. While those cured in 5% of Na2CO3 solution reduced significantly the compressive strength of concret