Statistical Correlation Analysis Research Articles

Analysis of Work Readiness Based on Soft Skills, Machining Knowledge, and 5S Work Culture

The aims of this study were to analyze 1) the influence of soft skills on the work readiness of students at Mechanical Engineering Vocational High Schools in the city of Palembang; 2) the effect of machining knowledge on the work readiness of students of Mechanical Engineering Vocational High Schools in the city of Palembang; 3) the effect of 5S work culture on the work readiness of students of Mechanical Engineering Vocational High Schools in Palembang city; and 4) the influence of soft skills, machining knowledge, and 5S work culture simultaneously on the work readiness of students of the Mechanical Engineering Vocational High School in the city of Palembang. The research method used is correlational research. The subjects of this research were class XII students of Mechanical Engineering Vocational Schools in Palembang City, recruited using a purposive sampling technique with the provision that students would work after graduating from Vocational High School. Thus, for a population of 360, the total sample was 187 respondents. The technique of collecting data for this research is a questionnaire and multiple-choice tests. Data analysis techniques were performed using correlational statistical analysis and regression analysis. The results of the study were the following: 1) Soft skills have a positive and significant effect on work readiness by 34.56%; 2) Machining knowledge has no effect on job readiness; 3) 5S work culture has a significant and positive effect on work readiness by 15.90%; and 4) Soft skills, machining knowledge, and 5S work culture have a positive and significant effect on work readiness by 53.5%.

Analysis of the Ability to Develop CNC Machine Part Programs for Vocational High School Students in Indonesia

The aims of this study are (1) to analyze the effect of the ability to read technical drawings on the ability to make CNC program parts; (2) to analyze the effect of geometry skills on the ability to make CNC program parts; (3) to analyze the effect of cutting parameter knowledge on the ability to make CNC program parts; and (4) analyze the effect of the ability to read technical drawings, geometry skills, and knowledge of cutting parameters simultaneously on the ability to make CNC program parts. This research is quantitative correlational research. The subjects of the study were 360 students of SMK class XII in the field of Mechanical Engineering in the city of Palembang, Indonesia, using a random sampling technique by Isaac and Michael equations so that a total sample of 187 students was obtained. The data collection method uses the test method. The data analysis used is a correlational statistical analysis between the three dependent variables and one independent variable. The results of the study: (1) The ability to read technical drawings has a positive and significant effect on the ability to make CNC programs by 11.17%; (2) Geometry ability has no significant effect on the ability to make CNC programs; (3) Knowledge of cutting parameters has a positive and significant effect on the ability to make CNC programs by 75.36%; and, (4) the ability to read technical drawings, geometry skills, and knowledge of cutting parameters have a positive and significant effect on the ability to make CNC programs by 89.9%.

Influence of Getting on the Balcony Behavior on Digital Transformation of Insurance Firms in Kenya

This paper examines the influence of getting on the balcony behavior on digital transformation of insurance firms in Kenya within the framework of adaptive leadership theory. The study acknowledges the pivotal role of adaptive leadership behavior in fostering leader-organization value-congruence, perspective-taking, and self-awareness. A positivist approach and a descriptive research design were employed; targeting a population of 392 supervisors from the 56 registered insurance firms listed by the Insurance Regulatory Authority. Using a stratified random sampling technique, a final sample of 127 respondents was obtained, representing a response rate of 63% from the initial study sample of 198. Getting on the balcony behavior was operationalized through value congruence, perspective taking, and self-awareness dimensions. At the same time, digital transformation was assessed using digital innovation, customer experience, and returns on assets capabilities metrics. Descriptive and inferential statistical analyses, including means, standard deviation, correlation analysis, chi-square test, one-way ANOVA, and ordinal logistic regression, were employed to analyze the research data and to test the study hypothesis. The ordinal logistic regression analysis findings, represented by the Nagelkerke Pseudo R-square coefficient, indicated that getting on the balcony behavior explains 37.2% of the variance in digital transformation (Nagelkerke Pseudo R² = .372). Furthermore, the parameter estimates derived from the ordinal regression analysis revealed that getting on the balcony behavior predicted digital transformation, with a significant beta coefficient of -4.100, p≤.05. In conclusion, this study establishes a substantial connection between "getting on the balcony" behavior, encompassing value congruence, perspective taking, and self-awareness, and the digital transformation of insurance firms in Kenya. Specifically, when leaders actively pursue value congruence through perspective-taking and self-awareness practices, this adaptive leadership behavior significantly and positively influences digital transformation. Consequently, the study recommends insurance leaders to proactively embrace getting on the balcony behavior by implementing policies and practices that promote value congruence, enhance perspective-taking, and establish self-awareness. Further, the adaptive leadership framework should be evaluated in broader financial services sector and other industries and regions.

Relationship between Teacher Involvement in Management of Physical Resources and Leadership Style in Secondary Schools in Uasin Gishu County, Kenya

The study established the effect of teacher involvement in management of physical resources on distributed leadership style in secondary schools in Uasin Gishu County, Kenya. The study employed a descriptive research design to collect data from 25 public secondary schools with 375 teachers in Ainabkoi Sub-County, Uasin Gishu County, Kenya. The study conducted descriptive analysis (frequencies, percentages, and mean) and inferential statistics (correlation and regression weight analysis to test hypothesis and model of the study respectively). Pearson correlation indicated that teacher involvement in physical resources management had a positive and significant relationship with distributive leadership style (r =.671, p = .000<.05). The study concluded that teacher involvement in physical resources management had a positive and significant influence on teachers’ willingness to develop distributive leadership skills. The implication is that teacher involvement in physical resources management has the likelihood of increasing their willingness to distributive leadership skills. The study recommends that public secondary schools’ management should involve teachers in physical resources management. In particular, teachers should be involved in the maintenance and purchase of instructional materials, management of inventory of equipment, and review of school’s strategic planning.

Darcy Forchhemier Prandtl-Eyring nanofluid flow with variable heat transfer and entropy generation using Cattaneo-Christov heat flux model: Statistical approach

In the current investigation, we studied the Prandtl-Eyring nanofluid with base fluid engine oil is flowing through a heated stretching surface with entropy production of and variable transfer analysis. Titanium dioxide (TiO2) nanoparticles (NPs) are mixes with engine oil to produce the nanofluid. By exposing the flow of the nanofluid over the heated, slippery surface, we are able to analyze the thermal transmission and flow mechanism. The effects of Darcy-Forchhemier, heat absorption/generation, Cattaneo-Cristov heat flux model and radiative flux are also taken into account in this study. Highly nonlinear partial differential equations that describe the nanofluids flow are converted into a set of ordinary differential equations via similarity transformation. The numerical technique named “shooting technique” is applied to obtain solution of the resulting system of ODEs. Error estimation, regression, and correlation statistical analysis techniques are used. Statistical approach is also applied on the model. In order to evaluate the constancy of the association features, the probable error is determined. Tables and figures are used to present the results. It has been noted that including nanoparticles into engine oil decreases skin friction while accelerating the transfer of energy. Deceleration is caused by the velocity field being greatly impacted by elements including porosity, the Darcy effect, and the nanoparticles volume fraction. Additionally, as the Brinkman number rises, entropy generation rises and the Bejan number falls.

Hubungan Gaya Komunikasi Pemimpin dengan Kinerja Karyawan PT. Socfin Indonesia Perkebunan Tanah Besih Serdang Bedagai Sumatera Utara

Relationship between Leader's Communication Style and Employee Performance of PT. Socfin Indonesia Plantation Tanah Beih Serdang Bedagai North Sumatra
 The performance of each employee in each division is highly dependent on the communication style of the leader of the division head. Differences in leadership style of communication often lead to jealousy between divisions. In addition, based on observations made at PT. Socfin Indonesia Plantation Tanah Besih Serdang Bedagai, North Sumatra, the performance of the employees is considered to be lacking. The purpose of this study was to determine the leadership communication style, employee performance, and the relationship between leadership communication style and employee performance at PT. Socfin Indonesia, Serdang Bedagai Land Plantatio n, North Sumatra. The population in this study were 226 people. Sampling using the Slovin formula so that the number of respondents in this study were 69 employees with descriptive research methods and data analysis used was descriptive analysis and statistical correlation analysis. The results of this study indicate that the leadership communication style has a positive and significant relationship with the performance of employees of PT. Socfin Indonesia Perkebunan Tanah Besi, Serdang Bedagai, North Sumatra, amounted to 67,6%, this is assumed based on the results of the correlation test with the acquisition of the correlation coefficient value obtained at 0,676 with a sig value. (2-tailed) of 0,00 < 0,05 and the results of the linearity test with an F value of Linearity of 66,30 > F table 3,13 with a significance value of 0,00 < 0,05. The leader's communication style has a score between 139-276 which means that the leader's communication style in the category is good enough to be good enough with respondents who responded well enough as many as 18 people (26,1%) who gave good responses as many as 18 people (26,1%). Employee performance had a score between 139-276 in the category good enough to good with respondents giving a fairly good response of 18 people (26,1%) who gave good responses as many as 18 people (26,1%).

The relationship between self-esteem and happiness of college students in China:A moderated mediation model

ABSTRACT The objective of the study is to explore the influence of self-esteem on the happiness levels of college students and the mediating roles of social avoidance and loneliness. 1021 college students between 18 and 24 years of age completed the Self-esteem Scale, General Well-being Scale, Social Avoidance and Distress Scale, UCLA Loneliness Scale and Interpersonal Trust Scale.And descriptive statistical analysis and correlation analysis, structural equation model analysis were conducted. The result turns out that Self-esteem negatively predicted the happiness levels of college students. Self-esteem indirectly predicted happiness through three paths: mediating the roles of social avoidance, mediating the roles of loneliness and the chain-mediated roles of social avoidance and loneliness in college students.Interpersonal Trust moderated the relationship between loneliness and happiness.The higher the self-esteem levels of the college students, the less happiness they experienced.

Gender-Specific Variations in BMI Status of Students' Social Networking Site Usage: A Comprehensive Statistical Analysis

The present study investigates the association between gender and body mass index (BMI) status through a comprehensive statistical analysis. A diverse sample of participants was utilized to examine the prevalence and distribution of different BMI categories among males and females. Statistical techniques, including crosstabulation, chi-square tests, and correlation analysis, were employed to analyze the data and determine the significance of the relationship. The results of the analysis revealed distinct gender-specific variations in BMI status. Among females, the majority fell into the normal weight category (n=89, 49.0%), while males showed a higher prevalence of overweight (n=32, 21.5%). The crosstabulation table further demonstrated the distribution of participants across gender and BMI status categories, providing valuable insights into the prevalence of specific BMI statuses among males and females. The chi-square tests confirmed a significant association between gender and BMI status (p < 0.001), indicating that gender significantly influenced the likelihood of being in specific BMI categories. This finding emphasizes the importance of considering gender-specific factors in understanding and addressing BMI-related health disparities. The correlation analysis revealed a moderate positive association between gender and BMI status (r=0.205, p < 0.001), indicating that as gender changed from female to male, there was a tendency for BMI status to shift from lower categories to higher categories.

GROWTH AND PROSPECTS OF DAIRY INDUSTRY IN INDIA: A DESCRIPTIVE STUDY

Milk provides good nutrition and helps the income of people in rural areas of the country. This study examines the growth and development of the Indian dairy industry. This study examine about milk production and consumption in the country. This study tries to estimate the milk production in the country given the current production model. It explores the relationship between the countrys milk production and its international exports and imports. These findings will assist policy makers and the agricultural industry in making production decisions. Statistical data, estimation and correlation analysis were used during the research process to show the relationship between the production, consumption and distribution of dairy products. The study found that under the current production pattern in the country, India could produce around 217 million tons of milk by 2025. In 2016-17, the countrys milk consumption was 351 grams, 229 grams more than international milk. per person per day. Correlation analysis is used to determine whether there is a relationship between imports and exports of dairy products and milk. The findings show that milk has a positive (r = 0.220, p = 0.601) effect on exports of dairy products and a negative (r = 0.228, p = 0.588) effect on exports. The study found that there are many ways to promote, produce and distribute milk and its products that policymakers and the dairy industry can use to their advantage. KEYWORDS: Dairy Industry, Production, Consumption, Development, per capita milk availability and correlation analysis

Influence of learning styles on student performance in self-instructional courses.

This study aimed to analyze the learning style of dentistry students in self-instructional courses to assist in pedagogical planning and to choose the most appropriate educational resources for the students' learning profile. A sample of 122 students who responded to the Learning Styles Questionnaire was analyzed. For statistical purposes, correlation analysis, chi-square test, odds ratio, and Student's t-test were performed. In the analyzed sample, there was a higher prevalence of students in the theoretical and reflector styles, and a lower prevalence of students in the activist and pragmatic styles. An analysis of educational resources demonstrated the predominance of theoretical and reflective content. The data show a statistically significant reduction of about 74% in the chances of passing for the activist-pragmatists group compared to other students (χ2(1, N = 122) = 5.795, p < 0.05, odds ratio = 0.26). On the other hand, reflector students who exhibited a lower preference for the activist style had a higher chance of course completion, with a 3.33-fold increase in the likelihood of passing the course (χ2(1, N = 122) = 5.637, p < 0.05, odds ratio = 3.33). These findings highlight the importance of considering students' learning styles in educational planning and resource selection to optimize student performance. Further research is warranted to explore the implications of these findings and to investigate additional factors that may influence student success in self-instructional courses.

Resource Optimisation of Distributed Manufacturing Processes Using Simulation

Non-destructive testing processes in the technological cycle of a wagon repair enterprise largely determine safety of railway transport facilities. The most effective ways to control such processes can only be determined through simulation which makes it possible to assess stability of the production system in a wide range of both external conditions and internal factors.The objective of the work is to create a method for optimising the resources of distributed manufacturing processes for non-destructive testing of a wagon repair depot based on simulation to reduce the likelihood of stopping the production cycle and reducing unreasonable costs of the enterprise.The features of non-destructive testing as a stage of the technological cycle of the enterprise are considered followed by the analysis of information on the qualifications of the specialists of the wagon repair company. The positions of non-destructive testing and controlled details are described and analysed within the framework of the queuing theory. To optimise the non-destructive testing division, simulation modelling is used, while mathematical statistics methods and correlation analysis are used to process the simulation results.A built model of a non-destructive testing unit comprises posts at the units for repair of parts of the automatic coupling devices and the wagon bogie, wheel sets. A production personnel management scheme is proposed, which might be a basis for optimising the organisational structure of the non-destructive testing unit.The simulation resulted in formulating requirements for qualification of non-destructive testing inspectors of the wagon repair depot. It is shown that the optimal strategy for development of a subdivision should be aimed at ensuring the universal qualification of employees, in which they have the necessary competencies to perform work at all testing positions. This will increase the average occupancy rate of NDT inspectors from 0,34 to 0,45 and reduce the average delay time of an item at the post from 650 % to 150 % of the standard time.

Identifying and categorizing influencers on Instagram with eye tracker

Purpose This paper aims to explore the recognition and success of different ways of branding native advertising in influencer marketing. Design/methodology/approach The data are evaluated using statistical tests, correlation and cluster analysis. Findings It was found that the higher the recognition rate of a post tagged in a particular way, the better the tagging method for influencer marketing on Instagram. Based on the findings of this study, word tag is recommended first because it is flexible and has one of the highest recognition rates. Research limitations/implications The generalizability of the results across different regional settings requires further investigation. Practical implications Good labeling of native advertising leads to greater success. Originality/value This study can be used by marketing managers, advertisers and influencers to gain insight into the issue, as well as to better select the appropriate labeling method for their advertising content.

A new integral enthesial-comorbididity index of psoriatic arthritis activity

To develop an integral index of psoriatic arthritis (PsA) activity. 117 patients with PsA (M/F - 63/54) were included. Patients' age 44±11 years, psoriasis (Ps) duration - 213±153 months, PsA duration - 73.4±78.5 months. Patients underwent standard clinical examination of PsA activity: tender (out of 68) and swollen (out of 66) joint counts (TJC, SJC), LEI, tenderness of the plantar fascia (PF), skin lesion severity (BSA), presence of nail Ps, body mass index (BMI), erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), DAPSA, FACIT-F. Parametric and nonparametric statistic methods, correlation and ROC analysis were used. Mean DAPSA was 38±21, TJC - 14.2±10.6, SJC - 10.6±8.3, ESR - 30.5±29.5 mm/h, CRP - 23.3±29 mg/l, LEI - 1.2±1.5, FACIT-F - 32±11, BMI - 27.4±6.2 kg/m2. The following significant positive correlations were revealed: between DAPSA and BMI, patients' age, ESR, PsA and Ps duration, TJC, SJC, LEI, presence of PF enthesitis, skin lesion severity, presence of nail Ps. A negative correlation between FACIT-F and male sex was found. Based on the predictive model of parameters, the Entesial-Comorbid Index of PsA (ECIPsA) was created: 3.81×LEI+13.72×PF+0.54×Age-0.25×FACIT-F+7.36×BSA+7.94×PsA duration+5.5×Nail Ps+0.32×BMI-3.52, namely LEI - Leeds Enthesial Index; PF - pain in the PF; patient's age; FACIT-F - fatigue scale; BSA<3%=0, ≥3%=1; PsA duration≤2 years=0, >2 years=1; presence of nail Ps=1, absence=0; ECIPsA≥28 corresponds with high PsA activity according to DAPSA≥28. ROC analysis of sensitivity and specificity of the prognostic model demonstrated high correctness of the index: the area under the ROC curve was 0.768, 95% confidence interval (0.624-0.913). The new PsA activity index corresponds to the existing ones and takes into consideration the clinical heterogeneity and comorbidity of the disease.

Strategic Plan Implementation Factors and Health Conditions Promotion in Rwanda: A Case of Karongi DDP in Bwishyura Sector

The general objective of this research was to investigate the effect of strategic plan implementation on the living conditions Bwishyura Sector, Karongi District. The specific objectives was to determine effect of strategic leadership on health conditions of Bwishyura population, to establish effect of organizational structure on health conditions of Bwishyura population, and to determine effect of human resources on health conditions of Bwishyura population. The study was target 33,065 population of Bwishyura sector in which a sample size of 396 respondents determined using Slovin’s formula selected using probability and non-probability sampling methods. In this regards, in probability sampling methods, the study employed simple random sampling technique to choose project beneficiaries; and procurement officers using purposive sampling technique. The research instrument to collect data was questionnaire and interview. Using statistical product and service solution used to generate descriptive statistics (frequency, percentage, mean and standard deviation) and inferential statistics (correlation and regression analysis) for statistical data. The Pearson correlation obtained was estimated to 0.571 indicating a positive index and a positive correlation linking the two variables. The “sig.value” indicating that the value is less than 0.05 (Note that the SPSS output always indicate a value less than 0.005 as 0.000). The p value was 0.000 (2-tailed). All of these assumption of the respondents from the population of Bwishyura sector in Karongi district were helped the research to conclude that the strategic plan implemented were contributed positively to the health condition of the population of Bwishyura sector. Therefore, we recommend other further studies to be done and concentrate on two areas: Future studies should work on the contribution of local government in improving global economy and also to find out how the influence of population increase and poor technology contribute to the delay in services and customer management in other sectors in Karongi district. Keywords: Knowledge, practice, first aid delivery, commercial motor cycle riders

Web Platform for Gathering and Analyzing Data from the Neurogame Mobile Application.

Today's cell phones are now smartphones, providing a wide range of possibilities for their use, much more than just simple phones. The custom application for the Android operating system, based on an open-source platform for mobile devices is intended for the examination of cognitive functions: attention, concentration and fine motor skills in children of different age groups. The Neurogame application for mobile devices and web platform development is used for retrieving and analyzing mobile application data, providing relevant indicators for the executive functions of the respondents. Material and methods: The research included 50 children with the developmental disorders ADHD and dyslexia (study group) and 50 healthy children (control group), randomly selected, evenly represented by gender and age. Using the application, we determine attention, concentration and motor skills (reaction speed) as part of the executive functions of the respondents. The web platform has the purpose of gathering and processing the data from the mobile application, as well as their automatic visual representation. Results: The ANOVA test showed that there are no gender differences in all the studied groups. A statistical correlation analysis showed that age does not affect the results in healthy school children. In children with dyslexia, age affects positively for total hits and negatively for total misses. In children with ADHD, there is a positive correlation with age for all variables except total hits (t H). Student's T-test showed that there were significant differences for the variables' total hits (t H) and total reaction time (t h) in milliseconds between healthy school children and children with dyslexia. Additionally, Student's t-test indicated that there were significant differences for the variables' total tries (t T) and total hits (t H) between healthy school children and children with ADHD. Finally, Student's t-test indicated that there were significant differences for the variable total tries (t T) between children with dyslexia and children with ADHD. Multiple Regression Results showed a significant difference between healthy school children, children with ADHD and children with dyslexia for all variables (total tries (t T), total hits (t H), total misses (t M) and total reaction time in milliseconds (t h)). Conclusion: The Neurogame application provides a opportunity to assess the motor skills and concentration level, as well as the focus of the target population by measuring the total number of tries, the total number of hits, the total number of misses and the reaction time expressed in milliseconds which are defined as monitoring variables. The development of the web platform and the connection to the application enabled easier access and distribution of the analyzed results to the stakeholders (parents, teachers, therapists or health professionals) in order to further treat the ascertained condition.

Triad of Cheiloscopy, Dactyloscopy, and Blood Groups: Does it Signify Anything?

The knowledge and importance of blood groups emerged from transfusion medicine and its relation with certain malignancies has been proven. Its importance in forensic medicine was brought to light when its association was found with the distribution of finger patterns. Thus, few studies exist proving the relationship between dactyloscopy and blood groups. Cheiloscopy on other hand is the study of the irregularities present on the lips forming a unique arrangement called the prints of the lip. Our paper aims at elucidating any unique combination if any that exists between prints on lips, prints of fingers, and blood grouping in a specific population, which might help in the identification of an individual. A total of 100 subjects of age varying from 15 to 40 years were included in the study. Subjects comprised of 50 males and 50 females. All the subjects were examined and their prints of lips along with prints of their fingers were taken. Blood groups were determined for each patient using the ABO system. Type I was found to be the predominant pattern of lips and whorl arrangement was the most recorded type of fingerprint in males whereas Type II arrangement along with loop prints of fingers was most observed in the case of females. The most common blood group in males was B+ and in females was O+ . Correlation between three parameters was obtained by Pearson correlation statistical analysis. The prints of the lips and fingers of an individual have never been similar and they tend to remain the same from a person's birth until his death. An association between the three things of an individual that is prints of lips, fingers, and his blood group has been tried to be elucidated through the present research to aid in forensic identification.

Examining the influence of sibling structure on academic performance: A comparative study of younger and elder siblings

Empirical evidence has shown that academic performance is shaped by the dynamic interplay between three spheres: the family, the school, and the community. Epstein's theory suggests that sibling structure can impact academic performance through various mechanisms. This study examines the influence of sibling structure on academic performance, with a specific focus on younger and elder siblings. Utilizing a sample of 600 students from three tertiary institutions in Enugu, Nigeria, the authors investigated the impact of birth order and age gap within siblings on academic achievement. The authors adopted the Epstein Model (1987) as the theoretical framework for this study. Results from statistical analysis, including t-tests and correlation analysis, show that the mean academic performance of elder siblings was significantly higher than those of younger siblings (t = -6.331; mean1=2.75; mean2=3.26; df= 589; p&lt;0.01). There was a statistically significant dependence relationship between academic performance and sibling structure X2 = 154.973; df =4; n = 600; p&lt;0.01), with a coefficient of variation of approximately 0.4532, suggesting that about 45.32% of the variations or dependence in academic performance can be attributed to sibling structure. Siblings' family socioeconomic status had no statistically significant influence on their academic performances X2= 10.676; df=16; p=.829; p&gt;0.055), These findings contribute to the existing literature by highlighting the importance of considering sibling structure when examining academic outcomes. Understanding the differential impact of birth order and age gap on academic performance can inform educational policies and interventions aimed at enhancing educational opportunities and support for both younger and elder siblings.

Modeling the impact of energy poverty on income poverty, health poverty, educational poverty, and environmental poverty: a roadmap towards environmental sustainability.

Energy poverty has gained considerable attention worldwide, adversely affecting income, education, health, and the environment. However, no study has examined the linkages among these dimensions and especially during COVID-19 in the Pakistani perspective. To bridge this research gap, we scrutinized the relationship among these variables to measure the hypotheses. The study analyzed the survey data collected from university students to meet the research objectives. We employed SPSS 26 for statistical description and correlation analysis and AMOS 26 to construct structural equation modeling to test the proposed hypotheses. The findings disclose that COVID-19 pandemic boosts energy poverty in Pakistan. Moreover, energy poverty positively and significantly influences income poverty, health poverty, educational poverty, and environmental poverty. Finally, relevant practical suggestions are provided based on the study findings.

Polycyclic aromatic hydrocarbons in two sedimentary environments of the Tertiary Krepoljin coal basin

In the present study, statistical correlation analysis and multivariate statistical techniques (PCA/FA) were employed to investigate polycyclic aromatic hydrocarbons (PAHs) in sediments, such as illite-montmorillonite (IM) and calcite (Ct), from two sedimentary environments of the Tertiary Krepoljin brown coal basin in Serbia. The coal and sediment layers were formed in fresh-water bogs during the Lower Miocene period. The total amount of extractable PAHs was determined by gas chromatography with a triple quad mass detector (GC-MS-MS), and it ranged from 449 to 10585 μg l−1 in all sediments. Eight of the total 16 PAHs, which ranged from 175.17 to 658.42 μg l−1, include benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, dibenzo[a,h]anthracene, benzo[g,h,i]perylene, and indeno[1,2,3-cd]pyrene, which are regarded as potentially carcinogenic, indicating a higher possibility of adverse ecological effects. Medium molecular-weight (MMW) PAHs were found to be predominant in all sediments. PAH concentrations are affected by several factors, such as carbon content, H/C mole ratio, and (less significant) O/C mole ratio. The non-existence of a correlation between the N/C ratio and other parameters indicates unspecific changes which accompany the original organic matter. The lower-sulfur Ct sediment samples were found to have a higher PAH content than higher sulfur IM samples, leading to the conclusion that the PAH content of sediments may be related to the depositional environment.

The impact of capital market on the economic growth of Nigeria

The study assessed how the capital market affected Nigeria's economic expansion. Specifically, the impact of the Nigeria stock exchange's total value of transactions (TVTs), all-shares index (ASIs) and stock market capitalisation (MCAP) on Nigeria's economic development was evaluated. Time-series data covering 1986–2021 was obtained in the study. Estimation methods used in the study’s analysis include descriptive statistics correlation analysis, ARDL co-integration analysis, parsimonious error correction model, variance decomposition and other post-estimation tests. Discoveries from the study showed that MCAP positively impacts economic growth in the long and short run. The ASI affects economic growth positively and insignificantly in the long and short runs, and the TVTs exerts a significant positive effect on the economic growth of Nigeria. Hence, the study suggested that the Security and Exchange Commission should explore measures, including technological integration in trading activities, to deepen development in the capital market. Keywords: All-share index, gross fixed capital formation, market capitalisation, real gross domestic product, total value of transactions;