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Climate Variability & Establishment of Rainfall Threshold Line for Landslide Hazards in Rangamati, Bangladesh

Open Journal of Geology 2023年第9期13卷 959-979页

作者： Mahmuda Khatun abu Taher Mohammad Shakhawat Hossain Hossain md. Sayem Department of Geological Sciences Jahangirnagar University Savar Dhaka Bangladesh

This study aims to evaluate the impact of extreme rainfall events on landslides under current and past climate scenarios. Rainfall-triggered landslides are analyzed by rainfall estimates, derived using statistics of events. It is established that recent climate changes, mainly temperature and rainfall patterns have significantly increased the rainfall-induced landslide hazards in the Rangamati district, Bangladesh. It is also observed that the temperature and rainfall of Rangamati had increased gradually during the last 40 years (1981-2021). On 13 June 2017, a series of landslides triggered by heavy monsoon rains (300 mm/24 h) occurred and killed more than 112 people in the Rangamati hill district, Bangladesh. The highest annual decade rainfall is 3816 mm, recorded in 2010-21. A relationship between causalities and the number of events has also been established. The analysis shows that both antecedent and single-day major rainfall patterns can influence sliding events. It is established that monsoonal rainfall (June-September) can significantly influence catastrophic landslide hazard events. Finally, two rainfall threshold lines for the researched area are constructed based on antecedent and single-day major rainfall occurrences, as well as the number of fatalities caused by landslides. Total rainfall of 100 mm (16.66 mm/day) during six days appears to define the minimum rainfall that has led to shallow landslides/slope failures, while 210 mm (35 mm/day) within six days appears to define the lowest rainfall that could be a cause of catastrophic landslide in Rangamati district.

关键词： Climate Change Antecedent Rainfall Rainfall Threshold Catastrophic and Landslide

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Multistage Triaxial Behavior of Shallow Landslide Hazard Site Soil of Rangamati Sadar Area, Bangladesh

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Engineering（科研） 2023年第10期15卷 581-595页

作者： Mahmuda Khatun abu Taher Mohammad Shakhawat Hossain Hossain md. Sayem Department of Geological Sciences Jahangirnagar University Dhaka Bangladesh

The soil samples were collected from a shallow landslide hazard site of the Rangamati Sadar in Bangladesh to determine the shear strength properties of the soil. Multistage triaxial consolidation undrained test has become worldwide more accepted to determine the shear strength parameters. Multistage triaxial undrained tests were performed on five samples taken from five different depths of boreholes. Samples were evaluated under two natural conditions and three remolded situations. Samples were consolidated before shearing at confining pressures from 50 kPa to 1200 kPa. All the test results are discussed in terms of deviator stress versus axial strain, mean effective stress versus deviator curves, stress ratio versus axial strain, and excess p. w. p. versus axial strain curves. The samples consolidated at low effective stress first displayed peak positive values of excess p. w. p., followed by increased strains due to sample bulging failure, and only a few samples formed a shear surface failure. The strength parameters were estimated using the maximum deviator stress as the failure criterion i.e. the overall value of the cohesion is 20 kPa and the friction angle is 34°. Hence, the critical state line has been constructed and the critical state parameters have been calculated. The critical state stress ratio M was calculated to be 0.036. The shear strength of soil is one of the significant mechanical properties that are thoroughly used to assess the landslide and liquefaction potentiality of the soil.

关键词： Multistage Triaxial Shear Strength Critical State Stress Path Landslide

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Microforming of superplastic 5083 aluminum alloy

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中国有色金属学会会刊：英文版 2012年第S3期22卷 656-660页

作者： md.abu Mowazzem HOSSAIN Sung-Tae HONG Kyu-Yeol PARK Young-Sang NA School of Mechanical Engineering University of Ulsan Korea Institute of Materials Science

The mechanical behavior of superplastic 5083 aluminum alloy during microforming process was investigated by finite element analysis.A micro V-groove die was modeled to analyze the effects of forming time,load and temperature on the microformability of the 5083 aluminum ***,the microformability of the 5083 aluminum alloy was estimated using a microformability *** simulation results show that the microformability increases with the forming load,time and temperature *** of the 5083 aluminum alloy during microforming using the V-groove die was also investigated in terms of the effective strain *** results show that the superplasticity of the 5083 aluminum alloy occurs in a specific part of the material for a specific period during the microforming process depending on the forming conditions and the microformability index.

关键词： microforming superplasticity 5083 aluminum alloy

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Effect of Sodium Tri Polyphosphate (STPP) and Foreign Materials on the Quality of Giant Freshwater Prawn (<i>Macrobrachium rosenbergii</i>) under Ice Storage Condition

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Food and Nutrition Sciences 2012年第1期3卷 34-39页

作者： Sujay Paul md. Shaheed Reza abu Saim Mahammed Shadat Mandal Imrul Mosaddek Ahmed Mohammed Nurul Absar Khan md. Nazrul Islam md. Kamal 不详

There are reports on the use of chemicals like sodium tri polyphosphate (STPP) and foreign materials like pearl tapioca (locally called ‘sagu’), jelly (litchi) to adulterate freshwater prawn (Macrobrachium rosenbergii) prior to freeze processing to increase their weight. Studies were, therefore, undertaken to determine the changes in product quality on the use of different concentrations of STPP, sagu and litchi under ice storage condition. Percent weight gain of prawn was 5.46, 18.87 and 23.50 when dipped in 2%, 4% and 6% STPP solution, respectively. In all cases maximum water uptake by prawn muscle was during the first 6 h with fastest weight gain with STPP solutions containing tap water compared to those of ice and tap water. Organoleptic quality of the STPP treated samples became brown and spongy after 8 h of dipping treatment under iced condition. Quality assessment studies conducted after injecting sagu and litchi in prawn muscle showed little or no difference with those of control samples during the first 6 h, which turned whitish and swollen with severe drip loss after 24 h of ice stored condition, indicating characteristics for easy identification of the injected shrimps by organoleptic method.

关键词： Adulteration Freshwater Prawn Macrobrachium rosenbergii Pearl Tapioca Quality Assessment Sodium Tri Polyphosphate STPP

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Sedimentary and geochemical evidence of Eocene climate change in the Xining Basin, northeastern Tibetan Plateau

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Science China Earth Sciences 2018年第9期61卷 1292-1305页

作者： abu Sadat md.SAYEM Zhengtang GUO Haibin WU Chunxia ZHANG Fan YANG Guoqiao XIAO Zhilin HE Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China University of Chinese Academy of Sciences Beijing 100049 China Department of Geological Sciences Jahangirnagar University Dhaka 1342 Bangladesh CAS Center for Excellence in Life and Paleoenvironment Bering 100044 China State Key Laboratory of Biogeology and Environmental Geology School of Earth Sciences China University of Geosciences Wuhan 430074 China

The northeastern Tibetan Plateau began to grow during the Eocene and it is important to understand the climatic history of Asia during this period of so-called ‘doubthouse' conditions. However, despite major advances in the last few decades,the evolutionary history and possible mechanisms of Eocene climate change in the northeastern Tibetan Plateau remain *** Xining Basin in the northeastern Tibetan Plateau contains a continuous sequence of Early to Late Eocene non-marine sediments which provides the opportunity to resolve long-term climate changes during this period. In this study, we report the results of analyses of lithofacies, sediment color and geochemistry of bulk samples collected from the Xijigou section of the Xining Basin. An abrupt lithofacies change between the Early(~52–40 Ma) and Late Eocene(~40–34 Ma) indicates a change in the depositional environment from a shallow lake to a playa lake in response to a significant climatic shift. During ~52–40 Ma,higher values of sediment redness(a*), redness/lightness(a*/L*) and higher modified Chemical Index of Weathering(CIW′)indicate a relatively warm and humid climate, while from ~40–34 Ma the lower values of a*, a*/L*and lower CIW′ imply subhumid to semi-arid climatic conditions. The paleoclimatic records indicate a long-term(~52–34 Ma) trend of decreasing chemical weathering, consistent with global climate change. An abrupt sharp excursion of the proxy records during ~42–40 Ma suggests a relatively brief warm interval, corresponding to the Middle Eocene Climatic Optimum(MECO). We suggest that global cooling substantially reduced humidity in inner Asia, resulting in sub-humid to semi-arid climatic conditions after 40 Ma in the Xining Basin, which may have been responsible for the long-term trend of decreasing chemical weathering during the Eocene.

关键词： Eocene Climate change Sediment color Chemical index of weathering Xining Basin Tibetan Plateau

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Development of Quality Parameters for Yogurt with Strawberry Juice

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Food and Nutrition Sciences 2020年第12期11卷 1070-1077页

作者： Mohammad Tanzilur Rahman md. abu Zubair Kamrunnahar Shima Manasvi Prasad Chakma Department of Food Technology and Nutritional Science Mawlana Bhashani Science and Technology University Santosh Tangail Bangladesh

In this research, we improve the quality parameter of prepared yogurt using different levels (5%, 10%, and 15%) of strawberry juice. We investigated different organoleptic, chemical and microbiological quality characteristics. We found that plain yogurt is clearly better than 15% strawberry juice yogurt while 5% strawberry juice yogurt is almost as like as the plain yogurt. Acceptance of 10% strawberry juice yogurt is between 5% and 15%. We note that the organoleptic characteristics decrease with the addition of strawberry juice level. Analyzed chemical composition showed that strawberry juice incorporation increases the moisture content and acidity from 0% to 15% as strawberry juice contains higher moisture content (90.329%) and acidity (1%) than collected milk which contains 87.15% moisture content and 0.19% acidity. On the other hand, ash and fat content decreases as strawberry juice contains low ash (0.311%) and fat (1.64%) content than collected milk which contains 0.74% ash and 4.36% fat. Thus, nutritional quality decreases with the addition of strawberry juice. After performing the microbiological tests, it was recommended to consume the samples before the 5th day. We also found that various types of microbial (TPC, TCC, TFC) counts decline due to the high acidity of strawberry juice.

关键词： Strawberry Juice Milk Yogurt Organoleptic Chemical Microbiological

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Social Media Cyberbullying Detection on Political Violence from Bangla Texts Using Machine Learning Algorithm

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Journal of Intelligent Learning Systems and Applications 2023年第4期15卷 108-122页

作者： md. Tofael Ahmed Almas Hossain Antar Maqsudur Rahman abu Zafor Muhammad Touhidul Islam Dipankar Das md. Golam Rashed Department of Information and Communication Technology Comilla University Comilla Bangladesh Department of Information and Communication Engineering University of Rajshahi Rajshahi Bangladesh Department of Electrical & Electronics Engineering University of Rajshahi Rajshahi Bangladesh

When someone threatens or humiliates another person online by sending those unpleasant messages or comments, this is known as Cyberbullying. Recently, Bangla text has been used much more often on social media. People communicate with others on social media through messages and comments. So bullies use social media as a rich environment to bully others, especially on political issues. Fights over Cyberbullying on political and social media posts are common today. Most of the time, it does a lot of damage. However, few works have been done for monitoring Bangla text on social media & no work has been done yet for detecting the bullying Bangla text on political issues due to the lack of annotated corpora and morphologic analyzers. In this work, we used several machine learning classifiers & a model. That will help to detect the Bangla bullying texts on social media. For this work, 11,000 Bangla texts have been collected from the comments section of political Facebook posts to make a new dataset and labelled the data as either bullied or not. This dataset has been used to train the machine learning classifier. The results indicate that Random Forest achieves superior accuracy of 91.08%.

关键词： Cyberbullying Bangla Texts Political Issues Machine Learning Random Forest Social Media

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Level of Stress, Predisposing Factors and Status of Mental Health among Pharmacy Students of a Private University of Dhaka, Bangladesh: A Cross Sectional Study

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Health 2019年第2期11卷 222-232页

作者： A. H. M. Nazmul Hasan md. Anzam Ul Islam Smaranika Rahman Zobaida Mostarin Nishi md. Jakir Hossain md. Zobayer Hossain Gorapi Farhan Jamil md. abu Sufian Zabun Nahar Kanij Nahar Deepa md. Hamiduzzaman md. Asaduzzaman Mohiuddin Ahmed Bhuiyan Department of Pharmacy University of Asia Pacific Dhaka Bangladesh

Stress during tertiary educational period has significant negative effect on the performance of a student. Mental distress is increasing among students and is one of the important public health concerns. This study was carried out to investigate the socio demographic characteristics of students, level of their stress feeling, and status of mental health and to find out the co-relation of different factors associated with the level of stress feelings. A cross sectional study was conducted among the students of the Department of Pharmacy of UAP. A total of 504 students (181 male students and 323 female students) participated in this study. Feeling of severe stress was almost equal to both sexes. But, moderate level of stress was more associated with female students (N = 253, F = 78.33%) and overall female students were more stressful than male. Thought towards future career ranked one among many reasons of stress in students (59.67% for male students and 37.46% for female students). In terms of academic achievements, feeling of stress was higher in female students compared to male students (34.98% for female students vs. 15.47% for male students). Other factors such as unrealistic expectations, family relationship and affairs, socio economic condition, being of too busy also significantly participate in the development of stress in young mind. Mental health status was estimated by considering some facts such as state of shock due to unwanted life events, lacking of expression of emotions, reduced feeling of pleasure, unusual thinking, fear of any specific objects, short term memory loss, self identity disorder and lack of self confidence. We co-related different risk factors like age, gender, socio-economic condition, unrealistic thought patter to different levels of stress feeling. Feelings of stress were most among the student of 21 - 25 years of age. Socio-economic condition is always a great factor of stress, middle class society has more stress compared to other

关键词： Stress Factors of Stress Mental Health

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A highly efficient method for enriching TALEN or CRISPR/Cas9-edited mutant cells

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Journal of Genetics and Genomics 2016年第12期43卷 705-708页

作者： Hideyo Yasuda Eunsu Kim abu Musa md.Talimur Reza Jin-Hoi Kim Department of Stem Cell and Regenerative Biology Konkuk University

In recent years,genome editing with site-specific nucleases,such as ZFN（zinc finger nuclease）,TALEN（transcription activatorlike effector nucleases）,and CRISPR/Cas9（the type II bacterial clustered,regularly interspaced,short palindromic repeats-associated protein 9）,has gained popularity for use in cell lines,animals,and plants（Urnov et al.,2010;Miller et al.,2011;Cong et al.

关键词： A highly efficient method for enriching TALEN or CRISPR/Cas9-edited mutant cells gene DNA RNA ZFN

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Annual pattern of zooplankton communities and their environmental response in a subtropical maritime channel system in the northern Bay of Bengal, Bangladesh

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Acta Oceanologica Sinica 2018年第8期37卷 65-73页

作者： ABDULLAH Al Mamun ALAM md.Didarul AKHTAR Aysha XU Henglong ISLAM md.Shafiqul MUSTAFA KAMAL abu Hena UDDIN M Muslem ALAM md.Wahidul Laboratory of Microbial Ecology Ocean University of China Faculty of Marine Sciences and Fisheries University of Chittagong Department of Animal Science and Fishery Faculty of Agriculture and Food Sciences Universiti Putra Malaysia Campus Bintulu

Zooplankton plays an important role in aquatic food webs by fluxing of energy from primary producer to subsequent trophic levels in the food chain. The annual pattern of zooplankton communities and potential environmental drivers were studied in the Kohelia channel, Bangladesh from summer 2014 to spring *** were collected using net at a depth of 1 m. A total of 32 species belonged to 18 orders, 27 families and 15 taxonomic groups were identified. Of these species, 22 distributed in all four seasons of which 8 were dominant and highly contributing to the total communities. Species number peaked in summer next to winter and fall in spring while maximum abundance was in summer and minimum in spring. Multivariate analyses showed that there was a clear annual pattern in the zooplankton communities. Species diversity and evenness peaked in spring but fall in autumn while the high value of species richness was found in winter. Biological-environmental best matching（BIO-ENV） analyses conformed that community pattern of zooplankton was mainly driven by transparency salinity, and temperature individually or combined with water nutrients. These results demonstrate that annual pattern of the zooplankton community shaped by channel environmental factors in subtropical channel ecosystems, thus might be used for community-based subtropical coastal water bioassessment.

关键词： zooplankton trophic levels subtropical channel community structure multivariate approach

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