Influence of Shear Span-to-Effective Depth Ratio on Behavior of High‑Strength Reinforced Concrete Beams

Olaniyi Arowojolu,Ahmed Ibrahim,Abdullah Almakrab,Nicholas Saras,Richard Nielsen 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.3

The shear span-to-effective depth ratio (a/d) is one of the factors governing the shear behavior of reinforced concrete (RC) beams, with or without shear reinforcement. In high-strength concrete (HSC), cracks may propagate between the aggregate particles and result in a brittle failure which is against the philosophy of most design guidelines. The experimental results of six HSC beams, with and without shear reinforcement, tested under four-point bending with a/d ranged from 2.0 to 3.0 are presented and compared with different model equations in design codes. The a/d ratio has higher influence on the shear strength of reinforced HSC beams without shear reinforcement than beams with shear reinforcement. Most of the shear resistance prediction models underestimate the concrete shear strength of the beams but overpredict shear resistance of beams with shear reinforcement. However, the fib Model code 2010 accurately predicted the shear resistance for all the beams within an appropriate level of approximation (LoA).

The Effects of Group Sand play on the Psychological Health and Resilience of Street Children and Adolescents in Uganda*

Alice Kolawole Olaniyi,Shallon Atuheire,Lesley Lally,Ruá,n Kane,Iryna Danilova,Claudia Walker,Lynda Earls,Eimí,le Holton 한국임상모래놀이치료학회 2021 상징과 모래놀이치료 Vol.12 No.1

The authors analysed the effects of group Sandplay therapy on adolescents psychological health and resilience in a mixed-method research. They explored and categorized the themes these adolescents expressed during therapy. Fifteen children (n=15) were recruited for the study; (Boarding school children = 5; Day school children = 5; Street children = 5). The selection process was conducted in cooperation with an orphanage in Kabale, Uganda. The children who participated in the study underwent a forty-five-minute sand play therapy every week for nine weeks. The SDQ and RCADS were administered to the groups both pre- and post-intervention, with the data entered and analysed using SPSS. Group sandplay was found to significantly decrease the adolescents internalizing problems such as anxiety and depression, while their resilience had also significantly improved. The narrative analysis, in turn, yielded seven themes: basic needs; community-love-celebration; giving help-leadership-empowerment; security-danger, recreation-self-development-self-nurturance, education, and seeking help-faith.

Inflation-poverty causal nexus in sub-Saharan African countries: an asymmetric panel causality approach

Clement Olalekan Olaniyi,Nicholas M Odhiambo 경희대학교 글로벌 통상·금융연구원 2024 International Trade, Politics and Development Vol.8 No.1

Abstract Purpose – This study examines the roles of cross-sectional dependence, asymmetric structure and country-to- country policy variations in the inflation-poverty reduction causal nexus in selected sub-Saharan African (SSA) countries from 1981 to 2019. Design/methodology/approach – To account for cross-sectional dependence, heterogeneity and policy variations across countries in the inflation-poverty reduction causal nexus, this study uses robust Hatemi-J data decomposition procedures and a battery of second-generation techniques. These techniques include cross- sectional dependency tests, panel unit root tests, slope homogeneity tests and the Dumitrescu-Hurlin panel Granger non-causality approach. Findings – Unlike existing studies, the panel and country-specific findings exhibit several dimensions of asymmetric causality in the inflation-poverty nexus. Positive inflationary shocks Granger-causes poverty reduction through investment and employment opportunities that benefit the impoverished in SSA. These findings align with country-specific analyses of Botswana, Cameroon, Gabon, Mauritania, South Africa and Togo. Also, a decline in poverty causes inflation to increase in the Congo Republic, Madagascar, Nigeria, Senegal and Togo. All panel and country-specific analyses reveal at least one dimension of asymmetric causality or another. Practical implications – All stakeholders and policymakers must pay adequate attention to issues of asymmetric structures, nonlinearities and country-to-country policy variations to address country-specific issues and the socioeconomic problems in the probable causal nexus between the high incidence of extreme poverty and double-digit inflation rates in most SSA countries. Originality/value – Studies on the inflation-poverty nexus are not uncommon in economic literature. Most existing studies focus on inflation’s effect on poverty. Existing studies that examine the inflation-poverty causal relationship covertly assume no asymmetric structure and nonlinearity. Also, the issues of cross- sectional dependence and heterogeneity are unexplored in the causal link in existing studies. All panel studies covertly impose homogeneous policies on countries in the causality. This study relaxes this supposition by

Combined oral contraceptive and nitric oxide synthesis inhibition synergistically causes cardiac hypertrophy and exacerbates insulin resistance in female rats

Olatunji, Lawrence A.,Olaniyi, Kehinde S.,Usman, Taofeek O.,Abolarinwa, Bilikis A.,Achile, Caleb J.,Kim, In-kyeom Elsevier 2017 Environmental toxicology and pharmacology Vol.52 No.-

<P><B>Abstract</B></P> <P>Combined oral contraceptive (COC) use or inhibition of nitric oxide (NO) synthesis has been shown to cause hypertension and insulin resistance. However, the concomitant effects of COC and NO deficiency on the heart and glucose regulation are not well known. We therefore hypothesized that COC treatment during NO deficiency would lead to the development of cardiac hypertrophy that is associated with aggravated glucose deregulation, pro-inflammatory and pro-fibrotic biomarkers. Eight-week-old female Wistar rats were randomly allotted into control, NO deficient (<I>N</I> <SUP>G</SUP>-nitro-<SMALL>L</SMALL>-arginine methyl ester: L-NAME; 20.0mg/kg <I>b.w.</I>), COC-treated (1.0μg ethinylestradiol+5.0μg levonorgestrel, p.o) and L-NAME+COC-treated groups. The animals were treated daily for 6 weeks. Systolic blood pressure was estimated by tail-cuff plethysmography, insulin resistance (IR) and β-cell function were estimated by homeostatic model of assessment (HOMA-IR and HOMA-β). Pro-inflammatory (C-reactive protein; CRP and uric acid) and pro-fibrotic (plasminogen activator inhibitor-1; PAI-1) biomarkers were estimated in the plasma. Cardiac histological examination was also done. Results show that COC or L-NAME treatments led to increased blood pressure, HOMA-IR, impaired β-cell function, PAI-1, CRP and uric acid, without significant effect on cardiac mass. L-NAME+COC-treated group had significantly higher blood pressure, HOMA-IR, impaired β-cell function, PAI-1, CRP and cardiac mass than COC- or L-NAME-treated groups. Histological examination validated that COC use during NO deficiency causes cardiac hypertrophy. The present study demonstrates that COC treatment and NO deficiency synergistically causes cardiac hypertrophy that is associated with aggravated glucose deregulation, atherogenic dyslipidemia, pro-inflammatory and pro-fibrotic markers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> COC treatment or NO deficiency induces high blood pressure and cardiometabolic disturbances. </LI> <LI> COC treatment or NO deficiency does not result in increased cardiac mass. </LI> <LI> COC treatment and NO deficiency synergistically causes cardiac hypertrophy. </LI> <LI> COC treatment during NO deficiency exacerbates cardiometabolic disturbances. </LI> </UL> </P>

Some Calculated (p,α) Cross-Sections Using the Alpha Particle Knock-On and Triton Pick-Up Reaction Mechanisms: An Optimisation of the Single-Step Feshbache-Kermane-Koonin (FKK) Theory

Olise, Felix S.,Ajala, Afis,Olaniyi, Hezekiah B. Korean Nuclear Society 2016 Nuclear Engineering and Technology Vol.48 No.2

The Feshbache-Kermane-Koonin (FKK) multi-step direct (MSD) theory of pre-equilibrium reactions has been used to compute the single-step cross-sections for some (p,${\alpha}$) reactions using the knock-on and pick-up reaction mechanisms at two incident proton energies. For the knock-on mechanism, the reaction was assumed to have taken place by the direct ejection of a preformed alpha cluster in a shell-model state of the target. But the reaction was assumed to have taken place by the pick-up of a preformed triton cluster (also bound in a shell-model state of the target core) by the incident proton for the pick-up mechanism. The Yukawa forms of potential were used for the proton-alpha (for the knock-on process) and proton-triton (for the pick-up process) interaction and several parameter sets for the proton and alpha-particle optical potentials. The calculated cross-sections for both mechanisms gave satisfactory fits to the experimental data. Furthermore, it has been shown that some combinations of the calculated distorted wave Born approximation cross-sections for the two reaction mechanisms in the FKK MSD theory are able to give better fits to the experimental data, especially in terms of range of agreement. In addition, the theory has been observed to be valid over a wider range of energy.

Intelligent Offline Multi Object Recognition Walking Stick for The Blind

Ibrahim Mohammed Abdullahi,Olayemi Mikail Olaniyi,Jacob Omokhafe Irefu,Sangwon Oh,Ibrahim Aliyu 한국디지털콘텐츠학회 2021 The Journal of Contents Computing Vol.3 No.2

Vision is one of the most important characteristics of a human that aid their day to day activities. Loss of vision however affects the ability of humans to freely navigate their environment and recognized objects along their path. Existing object recognition systems for the blind are mostly cloud based and its performance depends on reliable internet access. This makes them unsuitable in places with unreliable internet. Therefore, in this paper, a multi-object recognition intelligent walking stick for the blind that is completely independent of the internet was developed. The system is divided into three units, detection, recognition and communication units. The detection unit make use of an ultrasonic sensor and a buzzer, for informing the user of an impending obstacle. The recognition system makes use of a camera for capturing images with Convolutionary Neural Network architecture and Mobile Network Single Shot Multi-Box Detector (MobileNet SSD) for detecting objects in images. The communication unit transmits the recognised objects through voice to the user in English Language. The entire system was deployed in a Raspberry Pi microcontroller due to its processing power. The result obtained from testing of the device on the field showed that the recognition unit achieved an average sensitivity, specificity, precision and accuracy of 87.26%, 67.45%, 89.07%, 82.50% respectively. This shows that the system is reliable and can be used in recognizing objects for the blind.