The Chittagong University Journal of Science

Greenhouse Gas Emission Due to Iron Recycling in the Chittagong City Corporation, Bangladesh

2023-02-14T04:07:20+00:00

Global warming due to greenhouse gas (GHG) emission is the most challenging issue nowadays. Life Cycle Assessment on different materials contributes to this by articulating greenhouse gas (GHG) emission in various stages. This study quantifies GHG emissions from the iron recycling process of Chittagong City Corporation (CCC). It collects technical data through an on-site visit and questionnaire survey to each of the selected processing industries and waste depots by a semi-structured questionnaire. The study shows that total GHG emission is 314 kgCO₂-eq/ton of scraps in waste depots. Processing industries contribute GHG of 605.3 kgCO₂-eq/ton for billet production and 80.3 kgCO2-eq/ton for rod production from electricity consumption. Moreover, these industries produce GHG of 0.875 kgCO₂-eq/ton for billet production and 2766.11 kg CO₂-eq/ton for rod production from natural gas consumption. The study contributes to global warming reduction practices from iron waste recycling in Bangladesh.

The Chittagong Univ. J. Sci. 44(1): 1-16, 2022

A Comparative Study of Divorce Levels and Patterns and their Determinants in an Urban and a Rural Area of Chattogram, Bangladesh

2023-02-14T04:07:21+00:00

This study examines the impact of selected socio-economic and demographic factors on divorced in Chattogram Metropolitan Area (urban area) and rural areas of Chattogram district, Bangladesh. In both the areas, logistic regression analysis reveals that occupation of respondents (women) and husbands, respondent’s age, drug addiction status of husbands, respondent’s educational qualifications, dowry taken by husbands, use of mobile phone or Facebook etc. are the positively significant effects on divorce.

The Chittagong Univ. J. Sci. 44(1): 17-32, 2022

Tree Biomass and Carbon Sequestration of Three Mangrove Species Planted in Bogachattor Forest Beat in the Chattogram Coast, Bangladesh

2023-02-14T04:07:23+00:00

The global climate is changing significantly due to deforestation, forest degradation and burning of fossil fuels. Afforesting along the coastal belt, Bangladesh may play a significant role in mitigating global climate change. This study quantified the tree-biomass and carbon mass in the Bogachattor forest beat of the Sitakunda forest range under the Chattogram coastal forest division. The study estimated that the total biomass of Sonneratia apetala, Avicennia officinalis, and Excoecaria agallocha were 432.61±82.02, 251.15±23.71, and 59.08±5.04 t ha- 1, respectively, with the mean annual increment of 21.63±4.10, 12.56±1.19, and 2.95±0.25 t ha-1 y-1, respectively. Furthermore, the total carbon mass were 216.31±41.01, 125.58±11.85, and 29.54±2.52 t C ha-1 for S. apetala, A. officinalis, and E. agallocha, respectively, with the mean annual increment of 10.82±2.05, 6.28±0.59, and 1.48±0.13 t C ha-1 y-1, respectively. Overall, the findings indicated that S. apetala, A. officinalis, and E. agallocha-based afforestation has the potential to mitigate climate change. The findings can be helpful for researchers and policymakers on the national and global scale to mitigate climate change.

The Chittagong Univ. J. Sci. 44(1): 33-50, 2022

Effect of Obesity on Developing Diabetes in Adult Population

2023-02-14T04:07:24+00:00

Diabetes is a kind of metabolic disease characterized by high blood glucose. High blood glucose occurs because of insufficient secretion of insulin by the pancreas or inability of body's cells to react properly to insulin or both. Problem with eyes, kidney failure, heart attacks, stroke and lower limb amputation are the possible long term effect of diabetes. An important indicator of glycemic control in diabetes is the level of Glycosylated hemoglobin (HbA1c). According to WHO an HbA1c of 6.5% is recommended as the cut point for diagnosing diabetes. This study focuses on the effect of obesity (BMI≥30) of the adults individuals on their HbA1c level based on a longitudinal data. The data for the study were collected from Health and Retirement Study (HRS) sponsored by the National Institute of Aging and conducted by the University of Michigan in USA. It is a nationwide cohort study for Americans over age 50 and their spouses. Profile analysis for longitudinal data is used in the study. Both classical and Bayesian approaches have been applied to carry out the study. The study shows that mean HbA1c is higher in all the time points for the individuals with obesity. Also the steeper trend line of mean HbA1c for individuals with obesity implies that, they are more likely to develop diabetes compared to other.

The Chittagong Univ. J. Sci. 44(1): 51-62, 2022

Determinants of Age at Menopause among Married Women in an Urban Area of Bangladesh

2023-02-14T04:07:26+00:00

Menopause is the upper bound of the female reproductive span. Considering the importance of this demographic event in the context of reproductive process and fertility, the prime objective of this research work is to investigate thoroughly the current scenario of age at menopause and also to identify the significant covariates of this last segment of human reproductive span among adult married women in an urban area of Bangladesh. This research work was based on the primary data, collected by direct field investigation through a well-structured interview schedule. In this study, a sample of 234 married women aged 40-55 years was interviewed; out of them, 113 respondents reported that they reached the menopausal stage at the time of the interview. The results show that the overall mean age at menopause among the studied women is 47.07±3.35 years with substantial variations by the respondents' background characteristics. The coefficient of variation (7.1%) indicates extreme heterogeneity in age at menopause of the respondents. The coefficient of skewness (ɣ= -0.58) and excess of kurtosis (ɣ= -0.86) reflect that the shape characteristics of menopausal age are negatively skewed and platykurtic. Findings from multivariate Cox-proportional hazard analysis demonstrate that respondents' current age, BMI, husbands' occupation, use of contraception, exercising habit, and presence of disease significantly influence the age at menopause. Based on the findings of this study, it can be concluded that awareness regarding the aforementioned issues should be taken into cognizance for the natural age at menopause.

The Chittagong Univ. J. Sci. 44(1): 63-84, 2022