Refine Search

New Search

Advanced search


44 articles
Page of 5
Articles per Page
Show export options
  Select all
Sciprofile linkRadko Petrov Mihajlow, Albena Ivanova
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 32-38; doi:10.29114/ajtuv.vol3.iss2.141

Abstract:In June 2019, a drone image recording was performed equipped with an RGB camera on an experimental wheat field at an interval of seven days three times a day. Within one day (12.06.2019) information was collected about the weather conditions and eight measurements were made every hour. The commonly accepted indices were calculated: VARIgreen and ExG for the one-month and one-day observations of the received RGB digitized information. A regression model was created for a full factor experiment of type 23. The interaction of the factors that characterize the conditions of the video was evaluated. Conclusions were formulated as to the influence of the factors under which the observations were made. A recommendation was made with regard to which part of the day it is most appropriate to take photos and video surveillance of wheat.
Ivaylo Vasilev Grancharov
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 62-71; doi:10.29114/ajtuv.vol3.iss2.114

Abstract:The continuous growth in the volume of liquid cargoes, transported by sea, leads to increase of tankers’ size and to implementation of appropriate shore facilities, which have to meet the relevant environmental requirements. In order to ensure safety during loading and discharging operations in shore terminals, it is necessary to make an assessment on the level of potential risk in port and onboard the vessel and to take all necessary steps to reduce the possibility for environmental impacts and occurrence of an accident especially when performing transfer operations to/from ships. The article presents some constructive decisions for building of shore tanks and their application for storage and transfer of petroleum products. The measures for the safe performing of the cargo operations are systematized after discussing of specifics by performing of all processes connected with loading or discharge. The precautions are defined in three critical points of action - operation on vessel systems, transportation of cargo using shore facilities and storage in tanks.
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 1-9; doi:10.29114/ajtuv.vol3.iss2.147

Abstract:Work engagement is a crucial determinant of university academic staff performance and ultimately of the quality of the provided tertiary education. It is therefore imperative to explore the principal factors it is contingent upon. Equally important is the congruence or the best fit between the personal values and organizational commitment along with the effect of the organizational citizenship behaviour on the work engagement level of the academic staff in South-West Nigerian Universities, which, in turn, provide the appropriate basis for a proper set of recommendations to be developed and put forward to the respective stakeholders. A sample of 382 staff was chosen from the broad range of public universities in South-West Nigeria through the stratified random sampling technique. Use was made of the following data collection tools: the Demographic Data Inventory (DDI), Work Engagement Scale (WES), Organizational Citizenship Behaviour Checklist (OCBC), Personal Values Scale (PVS), and Value Congruence Scale (VCS). Four hypotheses were formulated and tested by means of simple linear regression analysis and Pearson correlation with a significance level of .05. The results obtained reveal not only the significant contribution of organizational citizenship behavior to work engagement (β = .215, t = 12.603, p < .05) but also the decisive role of personal-organisational value congruence in the contribution of organizational citizenship behaviour to work engagement among the academic staff in South-West Nigerian universities.
Sciprofile linkAdenike Julianah Oladipo, Olusoji Olurotimi Adewumi, Akinleye Oluyemi Ogundiwin
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 39-53; doi:10.29114/ajtuv.vol3.iss2.139

Abstract:Methods and strategies traditionally used in teaching science have been described by several researchers as being unsatisfactory and ineffective over many years. Hence, this study examined the effect of Mercedes Model with Embedded Assessment Strategy and Technology on Biology students’ learning outcomes. A pretest-post-test control group, quasi experimental design was adopted for the study. Two purposively selected EDs were randomly assigned to experimental and control groups. Three senior secondary schools were randomly selected from each ED. Altogether, a total of six schools in the two selected EDs were involved in the study. Two intact classes (one science and another non-science) were randomly selected from each of the six schools making a total of twelve classes. In all 568 Senior Secondary Class I biology students formed the sample size. Five instruments were used to generate data for the study, namely, Mercedes Model with Embedded Assessment Strategy and Technology in Diffusion (M2EASTID), Mercedes Model with Embedded Assessment Strategy and Technology in Osmosis (M2EASTIO). Conventional Lesson Plan on Diffusion (COLPOD), Conventional Lesson Plan on Osmosis (COLPO) and Test on Students’ Learning Outcomes in Osmosis and Diffusion (TESLOOD). Four hypotheses were formulated and tested at 0.05 level of significance. Data collected were analysed using frequency counts, means, deviation and analysis of covariance. There was significant effect of treatment on students’ learning outcomes on selected biology concepts. Also, subject specialization has a significant effect on the dependent measures. Mercedes Model with Embedded Assessment Strategies and Technology therefore was effective and significantly improved students’ learning outcomes. Hence, it was recommended that biology teachers in senior secondary schools should adopt Mercedes Model with Embedded Assessment Strategy and Technology for teaching for understanding and application of biology concepts.
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 54-61; doi:10.29114/ajtuv.vol3.iss2.136

Abstract:Social phobia is a mental health problem that has been repeatedly linked with adolescents. This study therefore investigated the efficacy of Acceptance and Commitment therapy (ACT) on social phobia among secondary school adolescents in Oyo State, Nigeria. The study adopted a pretest – posttest control group quasi experimental design. The sample comprised of 104 secondary school adolescents identified with some levels of social phobia from the two randomly selected schools among the three senatorial districts of Oyo State. The selected students, grouped by schools and subsequently, treatment groups, were 51 and 53 for the control and experimental groups, respectively. The experimentation spanned a period of eight weeks, with ACT administered to the experimental group and placebo of leadership styles administered to the control group. The Social Phobia Inventory (SPI) was adopted and used for screening and in pretest and posttest stages. A statistical hypothesis was formulated and tested at 0.05 level of significance by means of the Analysis of covariance (ANCOVA). It was found that treatment with ACT significantly reduced the level of social phobia among school-going adolescents. ACT was therefore recommended for use in relieving school-going adolescents suffering from social phobia.
Bamikole Oludare Ogunleye, Oluwasogo Ruth Ojo
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 21-31; doi:10.29114/ajtuv.vol3.iss2.145

Abstract:Poor student achievement in science is a global challenge. Sustainable Development Goals 3 and 4 targeting people’s well-being and quality education as well as previous studies linking physical exercises to improved student memory and increased concentration become relevant. This study, therefore, determined the impact of physical fitness activities on students’ Basic Science achievement. The study adopted pretest, posttest, control group quasi-experimental design. Participants included 125 JS2 students from six schools in Ibadan, Oyo State, Nigeria. Instruments used were stadiometer, gymnasium mats, medicine balls, skipping ropes, cones, stopwatches, weighing scale and Achievement Test in Basic Science (r=.84). The experimental group was exposed to selected science concepts and physical fitness activities simultaneously while the control group was only taught the concepts. Data analysis employed descriptive statistics and Analysis of Covariance. Physical fitness activities had significant effect on students’ achievement (F(1,124)=347.12; P<.05). The experimental group scored higher (x̄=62.58) than control (x̄=53.76). Gender also had significant effect on achievement (F(1,124)=147.89; P<.05) with males performing better (x̄=61.04) than females (x̄=55.29). The interaction effect of treatment and gender on students’ achievement was not significant (F(1,124)=.08; P>.05). Physical fitness activities boosted students’ achievement in Basic Science. Physical fitness activities should, therefore, be implemented in schools.
Bamikole Oludare Ogunleye
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 10-20; doi:10.29114/ajtuv.vol3.iss2.146

Abstract:Entrepreneurship behaviour is a 21st century attribute required for transforming the industrial and employment space into productive ones. Science students are critical towards the achievement of these requirements. To ensure quality entrepreneurship education, science teachers’ entrepreneurship background and characteristics become germane. This study, therefore, investigated the extent to which science teachers’ entrepreneurship knowledge, attitudes and skills determine their classroom practices in entrepreneurship education in selected Senior Secondary Schools in Lagos, Nigeria. The correlational type of the cross-sectional descriptive research design was adopted. A purposively selected sample of 245 SS2 Science teachers from thirty schools in Lagos mainland, Nigeria participated in the study. Instruments used were: Teacher Entrepreneurship Knowledge Test (r=.86), Teacher Entrepreneurship Attitudes Scale (r=.89), Teacher Entrepreneurship Skills Inventory (r=.85) and Classroom Practices Rating Scale (r=.89). Data were analysed using Pearson Product Moment Correlation and Multiple Regression. Findings showed strong and significant bivariate relationships between each of teachers knowledge (r=.59), attitudes r=.55), skills (r=.52) and classroom practices. The three factors jointly explained 46% of classroom practices with significant relative effects. Teachers require good knowledge, attitudes and skills for effective implementation of entrepreneurship programmes in science education, hence, they need to be exposed to in-service training in entrepreneurial studies.
Opeyemi Shoaga, Folorunso Ajasa, Sciprofile linkSesan Olatunde Mabekoje
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 28-39; doi:10.29114/ajtuv.vol3.iss1.115

Abstract:This study investigated the effect of three play strategies on academic performance of low achiev-ing Basic 1 pupils in primary schools in Oyo State, Nigeria. A quasi-experimental research design using pretest, posttest, control group was adopted where pupils screened to have low achievement scores were selected from schools randomly assigned to treatment groups. Participants met on dif-ferent treatment strategies for eight weeks of two contact hours each. Academic performance was assessed before and after treatment with data analysed using Analysis of Covariance. Results in-dicated that the three play strategies are effective in improving pupils’ academic performance (F (3 124) = 310.566; p
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 40-53; doi:10.29114/ajtuv.vol3.iss1.121

Abstract:< p align="justify">The current study presents the results from the experimental research conducted on the influence of the regime parameters on the process for a five-dimensional Ball Burnishing (BB) finishing process with the help of a CNC milling machine on the Regular Reliefs (RR) obtained on complex functional surfaces. The elements of the technological system, necessary for the formation of RR of type IV on the complex surfaces, are presented. A planned factorial experiment is realized, through which the significantly affecting parameters of the BB process on the size and shape of the RR cells, are determined. The results obtained are statistically confirmed by a dispersion analysis (ANOVA) carried out. Conclusions, regarding the possibilities of obtaining RRs of type IV on complex surfaces through a process of five-axis simultaneous BB, are made.
Sciprofile linkOpeyemi Olumayowa Shoaga, Simidele Rasheed
ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Volume 3, pp 21-27; doi:10.29114/ajtuv.vol3.iss1.120

Abstract:The study examined the influence of socio-economic variables (parents’ income and parents’ educational background) and parental involvement on academic performance of pupils. The survey research design was adopted for the purpose of this study. A sample of 200 pupils in primary four was randomly selected from 10 basic schools for the study. Three research questions were raised and tested for the study. Data were collected using Questionnaire. Data were analysed using Analysis of Variance and Pearson Product Moment Correlation statistics. Significant difference existed in the academic performance of pupils based on their parents’ income while no significant difference existed in the academic performance of pupils based on their parents’ educational background. Furthermore, significant positive relationship was observed between parental involvement and academic performance of pupils. Findings of this study recommends among others that schools managers should develop intervention programmes aimed at addressing the strategies that will help the improvement of the quality and consistency of parental involvement in their children’s education activities if they anticipate better academic performance.
Page of 5
Articles per Page
Show export options
  Select all