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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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Journal of the Asiatic Society of Bangladesh, Science
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  This is an Open Access Journal Open Access journal
ISSN (Print) 1016-6947 - ISSN (Online) 1016-6947
Published by Bangladesh Journals Online Homepage  [88 journals]
  • A Comparative Study on Noise Pollution Levels In Dhanmondi Area, Dhaka: A
           Geospatial Analysis

    • Authors: Mahmuda Parvin
      Pages: 99 - 108
      Abstract: Noise pollution has been recognized as one of the most vital environmental pollutions that affecting urban area’s quality of life. Sound levels at different points of the study area have been recorded and presented spatially by geostatistical analysis. A comparison has been made between the study area data in 2019 and that of 2021. In 2021 the noise level was significantly higher despite the Covid 19 pandemic. The comparative study showed that the noise level of the study area in 2021increased significantly. Noise level data in the sample points of the study area on Friday (holiday) were also collected and found that it was higher than that of even working days, especially in the evening. J. Asiat. Soc. Bangladesh, Sci. 47(2): 99-108, December 2021
      PubDate: 2021-12-31
      DOI: 10.3329/jasbs.v47i2.57274
      Issue No: Vol. 47, No. 2 (2021)
       
  • Incidence, Abundance and Damage of Papaya Mealybug In Southern Part of
           Bangladesh And Its Management

    • Authors: MMH Khan, MN Hossain
      Pages: 109 - 120
      Abstract: The papaya mealybug, Paracoccus marginatus Williams and Granara de Willink, is a small hemipteran that attacks several genera of host plants, including economically important tropical fruits and ornamentals. A study was carried out at farmers’ papaya garden and homestead areas of 8 locations viz., Dumki, Bouphal, Dashmina, Patuakhali, Mirjagonj, Amtali, Kalapara and Kuakata of Patuakhali and Barguna districts of Bangladesh to observe the incidence, abundance, and damage potential of papaya mealybug, Paracoccus marginatus (Williams and Granara de Willink) from March to June 2019. An experiment consisting of seven treatments following randomized complete block design (RCBD) with three replications was conducted for controlling papaya mealybugs at Patuakhali Science and Technology University (PSTU) campus during March to June 2019. Results revealed that among 8 locations, the highest incidence of P. marginatus was recorded in June, and the lowest was in April. The maximum abundance of P. marginatus on leaves and fruits of the papaya plant was observed at Kolapara, and the lowest was at Amtali. The highest percent infested plants (65%) per location, infested leaves/plant (97%), and infested fruits/plant (47%) was recorded in Kolapara, and the lowest percent infestations (31, 18, and 11%, respectively) were in Amtali. Among all treatments, the removal of infested leaves with petioles and application of Nitro 505EC @ 1 ml/L of water (T1) was the best approach for the management of papaya mealybugs. The removal of infested leaves with petioles + Biotap plus extra 95EC @ 0.2 g/L of water (T3) could be used as 2nd choice for controlling papaya mealybugs. The results concluded that removal of infested leaves and the application of Nitro 505 EC at the rate of 1 ml/L of water might be used to control the papaya mealybug. J. Asiat. Soc. Bangladesh, Sci. 47(2): 109-120, December 2021
      PubDate: 2021-12-31
      DOI: 10.3329/jasbs.v47i2.57275
      Issue No: Vol. 47, No. 2 (2021)
       
  • Systematics of Modern Benthic Foraminiferal Assemblages From the Deltaic
           Mangrove Ecosystem of Sundarbans

    • Authors: Tumpa Saha, Subrota Kumar Saha
      Pages: 121 - 136
      Abstract: The contemporary intertidal foraminifera and estuarine environment information were collected from the four sites adjoining the deltaic mangrove environment in the Sundarbans. The marsh zones of the south-western coastal region of Bangladesh were examined for modern benthic foraminifera and to expound on the relationship of the foraminiferal assemblages with the environment. Due to high inaccessibility and remoteness, the taxonomic study of foraminifera and its depositional environment remains largely overlooked in the Sundarbans of Bangladesh. This study includes a detailed survey of depositional environment of these fluvio-deltaic to shallow marine sediments. The seventeen species belonging to fourteen genera representing nine families were recorded from surficial sediment of supratidal, intertidal, and dune environment of Kotka, Jamtala, Kochikhali, and Dimer char area. In the present study, these foraminiferal assemblages are characterized calcareous and agglutinated foraminifera. The Kotka beach is recognized as Nonionina assemblage zone, Jamtala beach designated as Ammonia assemblage zone, Kochikhali as Nonionina assemblage zone and Dimer char as Rosalina-Nonionina-Nonionella assemblage zone. The deposition of foraminifera is restricted to Sundarbans’ low to high marsh zone. J. Asiat. Soc. Bangladesh, Sci. 47(2): 121-136, December 2021
      PubDate: 2021-12-31
      DOI: 10.3329/jasbs.v47i2.57276
      Issue No: Vol. 47, No. 2 (2021)
       
  • Laboratory-Based Cytological and Biochemical Profile of Cerebrospinal
           Fluid for Children With Acute Bacterial Meningitis in Bangladesh

    • Authors: Mohammad Zakerin Abedin, Laila Jarin, Donald James Gomes
      Pages: 137 - 147
      Abstract: An attempt was made to analyze the cerebrospinal fluid (CSF) for a cytological and biochemical profile to identify etiological agents from children with suspected acute bacterial meningitis. The cerebrospinal fluid (CSF) samples from 371 suspected meningitis cases were examined, and the highest bacterial meningitis was found in 52(14.0%) cases in this study. Among a total of 371 samples of CSF, 272(73.3%) were crystal clear, 52(14.0%) were moderately turbid, 47(12.7%) highly turbid. The total leukocyte cell count of the CSF was proportionate to the turbidity. In the case of crystal clear CSF’s, total leukocyte counts (TLC) were normally ranging from <5 to 45 per mm3 with predominant lymphocytes. Moderately turbid fluid showed 46 to 500 cells per mm3 and highly turbid fluid showed from 501 to more than 10,00 cells/mm3. In the latter cases, differential counts demonstrated polymorphonuclear predominance. In addition, about 100% (52 cases) of positive and 12.5% (40/319) of negative cases had CSF protein concentration >100 mg/dL. CSF protein concentration greater than 100 mg/dl and sugar level below 40 mg/dl were considered as suspected bacterial meningitis in this study. Surprisingly, the C-Reactive Protein (CRP) values were found to be >40 mg/dL in both culturally positive and negative cases. Most of meningitis positive cases showed increased total cell counts as well as protein concentration, and decreased serum sugar concentrations. J. Asiat. Soc. Bangladesh, Sci. 47(2): 137-147, December 2021
      PubDate: 2021-12-31
      DOI: 10.3329/jasbs.v47i2.57277
      Issue No: Vol. 47, No. 2 (2021)
       
  • Variability of Rainfall Over the Coastal Area In Bangladesh by Using
           Climate Model

    • Authors: Shahana Islam, - Md Moniruzzaman, MA Mannan
      Pages: 149 - 160
      Abstract: The study attempt to understand the variability of rainfall by looking into the previous and future climate of the coastal area in Bangladesh from 1850 to 2100 by using the climate model (CMCC-CM- the Centro Euro-Mediterraneo Sui Cambiamenti Climatici Climate Model) of the Fifth Assessment Report (AR5) of the Intergovernmental Panel on Climate Change (IPCC). Rainfall data were collected from CMCC-CM by R programming for two GHGs emission scenarios (RCP 4.5 and RCP 8.5) referred to as ‘Representative Concentration Pathways (RCPs)’. The analysis has been conducted based on four seasons and an annual basis by plotting model data in MS Excel and R programming. The model shows that the average annual rainfall will increase from 1055.6 mm (during 1850-1900) to 1368.1mm (during 2051-2100) for RCP 4.5 while it will reach 1569.7mm (during 2050-2100) for RCP 8.5. Rainfall is also increasing for all seasons except winter. In winter season, the average rainfall will increase from 35.37mm (during 1850-1900) to 41.75mm (during 2051-2100) for RCP 4.5, where it will decrease from 35.37mm (during 1850-1900) to 22.55mm (during 2051-2100) for RCP 8.5 in the study area. The increasing and decreasing trend are more in high GHGs emission scenarios than in the medium, which will be alarming. Accordingly, this projection will be helpful to understand the adverse impacts of climatic elements and take short and long-term planning of decision-makers in that area. J. Asiat. Soc. Bangladesh, Sci. 47(2): 149-160, December 2021
      PubDate: 2021-12-31
      DOI: 10.3329/jasbs.v47i2.57278
      Issue No: Vol. 47, No. 2 (2021)
       
  • Production of Microalgal Biomass at Different Growth Phases to Use as
           Biofuel Feedstock

    • Authors: NJ Tarin, NM Ali, AS Chamon, MN Mondol, MM Rahman, A Aziz
      Pages: 161 - 171
      Abstract: The growth of microalgae under optimized conditions was determined for assessing their growth rate and biomass production. In this study, the growth of both green algae (Chlamydomonas noctigama and Chlorella vulgaris) and cyanobacteria (Anabaena variabilis and Nostoc spongiaeforme) was measured as optical density. Chlamydomonas noctigama and Chlorella vulgaris showed the doubling time of 9.5 and 8.0 hours, respectively, whereas Anabaena variabilis and Nostoc spongiaeforme showed the doubling time of 14.8 and 16.6 hours, respectively. All the species exhibited the highest growth in terms of biomass at the phase in between stationary and death phases. J. Asiat. Soc. Bangladesh, Sci. 47(2): 161-171, December 2021
      PubDate: 2021-12-31
      DOI: 10.3329/jasbs.v47i2.57279
      Issue No: Vol. 47, No. 2 (2021)
       
  • Factors Leading to Secondary School Dropout In Bangladesh: The Challenges
           to Meet the Sdg’s Targets

    • Authors: Md Ataur Rahman
      Pages: 173 - 190
      Abstract: Bangladesh is regarded as a success story for rapid economic development and changes in social indicators that have taken place in the last couple of decades. Enrolment in education, especially women's education, has reached a desirable level. However, the dropout rate in secondary education is still a concern, which has not been reduced to the desired level. This research aims to understand better the undisclosed causes of dropout at secondary level schools. The primary data were collected from 790 former secondary school level students and 1580 parents/guardians, enabling in-depth and systematic analysis of the issue.. The method used in this study is quantitative with logit analysis. The study results showed that students’ perceptions on education, working experience, low socio-demographic status (SDS), family size, total number of siblings, food deficit, distance of the school, bullied by peers/teachers have a significant effect on increasing the probability of dropping out of school. Contrariwise, parents’ academic support, NGO membership of family members, mobility to the local power structure, and government’s social safety net programmes support are significant variables to reduce the probability of dropping out. The research reveals that financial problems are severely engaged to increase the dropout rate, and non-financial factors together aggressively play a catastrophic role and lead the academic life of the dropout student towards the end. The study suggests authorities for rapid response to reduce dropout, which leads Bangladesh to achieve SDGs targets and eventually become an upper middle-income country by 2041. J. Asiat. Soc. Bangladesh, Sci. 47(2): 173-190, December 2021
      PubDate: 2021-12-31
      DOI: 10.3329/jasbs.v47i2.57280
      Issue No: Vol. 47, No. 2 (2021)
       
 
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