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An Analysis of Spatio-Temporal Trends of Land Surface Temperature in the Dhaka Metropolitan Area by Applying Landsat Images

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Journal of Geographic Information System 2021年第4期13卷 538-560页

作者： Musammat Shahinara Begum Sujit Kumar Bala AKM saiful islam GM Tarekul islam Debjit Roy Institute of Water and Flood Management (IWFM) Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh Survey and Investigation Division Irrigation Wing Bangladesh Agricultural Development Corporation (BADC) Dhaka Bangladesh Irrigation and Water Management Division Bangladesh Rice Research Institute (BRRI) Gazipur Bangladesh

Land surface temperature (LST) is a basic determinant of the global thermal behavior of the Earth surface. LST is a vital consideration for the appraisal of gradual thermal change for urban areas to examine the strength of the thermal intensity of the surface of urban heat island (SUHI) and to see how hot the surface of the Earth would be in a particular location. In this respect, the most developed urban city like Dhaka Metropolitan Area (DMA), Bangladesh is considered for estimation of LST, and Normalized Difference Vegetation Index (NDVI) changes trend in more developed and growing developing areas. The focus of this study is to find out the critical hotspot zones for further instantaneous analysis between these two types of areas. The trends of long-term spatial and temporal LST and NDVI are estimated applying Landsat images-Landsat 5-TM and Landsat OLI_TIRS-8 for the period of 1988 to 2018 for DMA and for developed and growing developing areas during the summer season like for the month of March. The supervised classification was used to estimate the land cover categories and to generate the LST trends maps of the different percentiles of LSTs over time using the emissivity and effective at sensor brightness temperature. The study found the change in land cover patterns by different LST groups based on 50th, 75th, and 90th percentile where the maximum LST for the whole DMA went up by 2.48°C, 1.01°C, and 3.76°C for the months of March, April, and May, respectively for the period of 1988 to 2018. The highest difference in LST was found for the most recently developed area. The moderate change of LST increased in the built-up areas where LST was found more sensitive to climate change than the growing developed areas. The vegetation coverage area decreased by 6.74% in the growing, developing areas compared to the developed areas

关键词： Land Surface Temperature Surface Urban Heat Island Urban Thermal Environment NDVI Change Vegetation Coverage Change

Nutrient dynamics in the Sundarbans mangrove estuarine system of Bangladesh under different weather and tidal cycles

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Ecological Processes 2013年第1期2卷 300-312页

作者： Shak Md Bazlur Rahaman Lipton Sarder Md Sayadur Rahaman Alokesh Kumar Ghosh Sudhin Kumar Biswas SM Shahjahan Siraj Khandaker Anisul Huq Abul Farah Md Hasanuzzaman Shikder saiful islam Fisheries and Marine Resource Technology Discipline Khulna UniversityKhulna 9208Bangladesh Chemistry Department Comilla UniversityComilla 3500Bangladesh

Introduction:Seasonal and tidal variations in nutrient concentration and water quality were investigated in the western Sundarbans of Bangladesh during the post-monsoon,winter and monsoon seasons during 2010–***:Water collected from the surface,middle and bottom layers at six locations of the Kholpetua-Arpangashia river system during high and low tides was analyzed for temperature,salinity,pH,dissolved oxygen(DO),total dissolved solids(TDS),electrical conductivity(EC)and dissolved nutrients(NO3–N,PO4–P,SO4 and NH3–N).Results:The study revealed that nutrient concentrations were influenced by seasonal *** nutrient levels during post-monsoon,winter and monsoon seasons,respectively,were in the following ranges:nitrate(0.06–0.40,0.06–0.46 and 0.08–0.46 mg/L);phosphate(0.09–0.18,0.05–0.42 and 0.10–0.16 mg/L);sulphate(58.71–86.14,68.68–119.01 and 78.15–136.47 mg/L)and ammonia(0.02–0.08,0.02–0.04 and 0.26–0.38 mg/L).Increased levels of PO4–P,SO4 and NH3–N and lower DO and salinity were recorded during the monsoon *** of the experimental sites showed higher NO3–N content during monsoon,whereas few elevated concentrations were observed during post-monsoon and winter *** and low tidal waters contained mean nutrient levels in the following ranges:nitrate(0.05–0.46 and 0.04–0.40 mg/L);phosphate(0.05–0.42 and 0.07–0.18 mg/L);sulphate(63.63–125.36 and 58.71–136.47 mg/L)and ammonia(0.02–0.38 and 0.02–0.37 mg/L)without following any distinct fluctuation *** western part of the Sundarbans receives less freshwater input during the monsoon season than other areas of the ecosystem,which reduces the variability of nutrient levels and water quality ***:This study provides considerable advances in understanding the seasonality of nutrient distribution with possible tidal *** data generated from this study will guide continuing efforts to support a sound management for coastal mangrove ecosystems.

关键词： Sundarbans Monsoon Post-monsoon Nitrate Phosphate Sulphate Ammonia Aquatic ecosystem Water quality River

Position statement of Hepatology Society, Dhaka, Bangladesh, on the management of acute variceal bleeding in a resource-limited setting

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iLIVER 2022年第4期1卷 205-208页

作者： Tanvir Ahmad Shahinul Alam saiful islam Golam Azam Mahabubul Alam SKM Nazmul Hasan Golam Mustafa Motahar Hossain MdAkmat Ali Mobin Khan Kurmitola General Hospital DhakaBangladesh Department of Hepatology BSMMU General SecretaryHepatology SocietyDhakaBangladesh Department of Hepatology BSMMUBangladesh Department of Gastrointestinal-Hepatobiliary and Pancreatic Disorders(GHPD) BIRDEM HospitalBangladesh Department of Hepatology Shahid Syed Nazrul Islam Medical CollegeKishoregonjBangladesh Square Hospital Bangladesh Addin Medical College DhakaBangladesh

Variceal bleeding is one of the important signs of decompensation in patients with cirrhosis of the *** is always a medical emergency and sometimes results in *** year many patients die due to acute bleeding *** outcome depends on bleeding and its complications as well as the severity of the underlying liver *** volume resuscitation,administration of antibiotics and vasoactive drugs,and early endoscopic therapy prevent rebleeding and *** living in rural areas are first referred to a district hospital from the Upazila health complex for any medical ***,commencing the resuscitation process as well as administration of the vasoactive drug(terlipressin)at the first attending hospital before being referred to a higher center will decrease the mortality in patients presenting with acute variceal bleeding.

关键词： Variceal bleeding Resource-limited setting Terlipressin Cirrhosis Primary care physician

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墨西哥湾盆地东南部区域构造演化过程探讨

现代地质 2020年第4期34卷 700-709页

作者：王阔栾锡武冉伟民魏新元张豪石艳锋 MOHAMMAD saiful islam 中国石油大学(华东)地球科学与技术学院山东青岛266580 中国地质调查局青岛海洋地质研究所山东青岛266071 青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室山东青岛266237 山东科技大学地球科学与工程学院山东青岛266590 University of Dhaka Faculty of Earth and Environmental SciencesDhaka 1000

墨西哥湾盆地东南部位于北美板块与加勒比板块碰撞交汇区域,是墨西哥湾地区构造最为复杂区域。涉及两大板块,北美板块和加勒比板块;两个二级板块,尤卡坦板块和巴哈马-佛罗里达板块。在总结前人研究成果基础上,结合深海钻探计划(DSDP)钻... 详细信息

墨西哥湾盆地东南部位于北美板块与加勒比板块碰撞交汇区域,是墨西哥湾地区构造最为复杂区域。涉及两大板块,北美板块和加勒比板块;两个二级板块,尤卡坦板块和巴哈马-佛罗里达板块。在总结前人研究成果基础上,结合深海钻探计划(DSDP)钻井资料以及最新二维地震数据,通过地震相特征识别,分析研究区构造演化过程,探讨板块之间相对运动对墨西哥湾盆地东南部区域的控制作用。结果表明:(1)墨西哥湾盆地东南部现今包含北古巴前陆盆地以及盆地北部被动大陆边缘的不规则中央裂陷区;(2)该区域经历多期构造活动,早侏罗世至中侏罗世中期南美板块与北美板块之间背向分离,白垩纪加勒比板块逆冲北美板块,晚白垩世早期海平面上升以及尤卡坦台地与佛罗里达台地抬升,白垩纪末期加勒比板块北侧古加勒比弧与北美板块碰撞拼合;(3)在早白垩世晚期,由于北美板块内部尤卡坦板块与巴哈马-佛罗里达板块之间的张裂运动,发育大量张性断层,产生NW-SE走向的地堑、半地堑构造样式。

关键词：墨西哥湾盆地东南部中央裂陷区多期构造活动地堑、半地堑

Eco-Friendly Pest Control in Cucumber (<i>Cucumis sativa</i>L.) Field with Botanical Pesticides

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Natural Resources 2013年第5期4卷 404-409页

作者： Abul Kalam Azad Arif Sardar Nilufa Yesmin Mizanur Rahman saiful islam Department of Crop Science and Technology University of Rajshahi Rajshahi Bangladesh Institute of Environmental Science University of Rajshahi Rajshahi Bangladesh

A field experiment on eco-friendly pest control in cucumber (Cucumis sativa L.) field was conducted at Rajshahi University during April, 2011 to June, 2011 with eight botanical pesticides prepared from the leaves and seeds of Bangladeshi plants. These botanicals are mahogany seeds, (Swietenia mahagoni), chirata leaves (Swertia chirata), jute seeds (Corchorus olitorius L.), garlic (Allium sativum L.), marigold leaves (Tagetes erecta) and carrot leaves (Daucus carota). One control treatment without botanicals was maintained during this experiment where only water was sprayed. Out of these botanicals, a less number of insect attacks on cucumber leaves (1.33 ± 0.19) were found in combined treatment of mahogany and chirata whereas a high number of insect attacks were observed in combined treatment of garlic and jute seed (5.89 ± 0.40) and control (4.66 ± 0.33). Individual application of chirata extract also showed good protection of cucumber leaves (1.67 ± 0.19) from insect attack. A smaller number of leaves perforations were found in the combined treatment of mahogany and chirata (3.44 ± 0.29) compared to control (14.22 ± 1.05). Chirata extract also showed good performance (4.00 ± 0.19) against leaves perforation of insect. Besides the pest control, botanical pesticides also have enormous effect on plant growth. The tallest cucumber plant was observed in the combined treatment of mahogany and chirata (469.00 ± 63.51 cm) and shortest in garlic treatment (84.56 ± 15.24 cm). The cucumber production was also high in combined treatment of mahogany and chirata (1863.33 ± 196.32 g) compared to control (1260.00 ± 501.63 g). From this study, it is found that combined application of mahogany and chirata extract not only showed good protection of cucumber plant from insect attack but also increased the cucumber production. Therefore, we conclude that farmers should use botanical pesticides from mahogany seeds and chirata leaves instead of toxic chemical insecticides for controllin

关键词： Cucumber Chirata Mahogany Extract Eco-Friendly

Moving Towards a Potential Conflict Resolution Mechanism Under the APSCO Framework:A Proposed Legal Mechanism

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Aerospace China 2020年第1期21卷 43-52页

作者： Mohammad saiful islam School of Law Beijing Institute of TechnologyBeijing 100081

Competition among countries has evolved from just on Earth but into space as space technology and space power is a key attribute in the world *** space technology has spread,due to the enormous develop-ment,into every sector of life in the Earth for the beneft of *** country has the ambition to be a part of the space *** Pacific Space Cooperation Organization(APSCO)is an organization that tries to promote space acivities through cooperation in the Asia Pacific *** paper attempts to explore the nature and categories of potential conflict that may arise under the APSCO framework ***,it also endeavors to establish an effective and better dispute settlement mechanism under the overal APSCO ***,this paper introduces the institutional framework and working procedures of the arbitration body for future smooth cooperation and space exploration by APSCO.

关键词： dispute legal mechanism counil consultations arbitration

Curculigo recurvata *** exhibits anti-nociceptive and anti-diarrheal effects in Albino mice and an in silico model

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Animal Models and Experimental Medicine 2020年第2期3卷 169-181页

作者： Shabbir Ahmad Mst.Samima Nasrin A.S.M.Ali Reza Nishan Chakrabarty Md.Akramul Hoque Sanjida islam Mohammad Shah Hafez Kabir Syed Mohammed Tareq A.H.M.Khurshid Alam Md.Areeful Haque Md.saiful islam Arman Department of Pharmacy International Islamic University ChittagongChittagongBangladesh Department of Biochemistry&Molecular Biology University of ChittagongChittagongBangladesh Department of Chemistry Wayne State UniversityDetroitMIUSA Department of Pharmacy University of RajshahiRajshahiBangladesh Drug and Herbal Research Centre Faculty of PharmacyUniversiti Kebangsaan MalaysiaKuala LumpurMalaysia

Background: Curculigo recurvata(C. recurvata) is an enthnomedicinally important herb reported to have significant medicinal values. The present study aimed to explore the in vivo and in silico anti-nociceptive and anti-diarrheal effects of a C. recurvate rhizome methanol extract(Me-RCR).Methods: The analgesic effects of Me-RCR were assessed using acetic acid-induced writhing and the formalin-induced flicking test. The drugs were administered intraperitoneally(IP) at doses of 200 and 400 mg/kg body weight(bw). Anti-diarrheal activity was evaluated by assessing intestinal motility, hypersecretion, and fecal score in mice at oral doses of 200 and 400 mg/kg·bw. Computer facilitated analyses for anti-nociceptive and anti-diarrheal activities of three isolated compounds from C. recurvata were undertaken to identify the best-fit ***: The Me-RCR showed significant(P <.05) peripheral anti-nociception at the highest dose. The extract inhibited both early and late phases of nociception in the formalin-induced writhing test. In the castor oil-induced diarrhoea model, the extract significantly(P <.05) prolonged the onset time of diarrhoea, inhibited percentage of diarrhoea, and decreased both the volume and weight of intestinal contents. Rates of intestinal fluid accumulation inhibition were(33.61 ± 1.00)% and(46.44 ± 0.89)% at Me-RCR doses of 200 and 400 mg/kg·bw, respectively. Moreover, a significant(P <.05) reduction in gastrointestinal motility was observed. An absorption, distribution, metabolism, excretion and/or toxicity(ADME/T) test showed that the selected compounds yielded promising results, satisfying Lipinski's rule of five for predicting drug-like potential. Notably, of the three phytoconstituents curculigine and isocurculigine possessed the highest affinity for the COX-1 and COX-2. Isocurculigine was also identified as the most effective anti-diarrheal compound in the computer-facilitated ***: An extract of the plant C. recurvata

关键词： analgesic anti-diarrheal anti-nociceptive curculigine Curculigo recurvata isocurculigine

The Relationship between Birds Diversity and Habitats in Phou Khao Khouay (PKK) National Park of Lao PDR

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Open Journal of Forestry 2019年第2期9卷 143-158页

作者： Phutpasong Thongsoulin Vichit Phanthuamath Md. saiful islam Sithong Thongmanivong Yongxiang Kang Department of Ecology College of Forestry Northwest Agriculture and Forestry University Yangling China Faculty of Forestry National University of Lao PDR Vientiane Laos Ministry of Natural Resources and Environment Lao PDR Vientiane Laos Department of Basic Science Sheikh Fazilatunnesa Mujib Fisheries College Jamalpur Bangladesh

In recent years, global warming, drought and little rain, forest fires, forest destruction and other human disturbances have had an important impact on the habitat environment of birds, affecting the number and quality of bird habitats, directly threatening the survival and reproduction of birds, leading to a sharp decline in the diversity of bird species. In this study, the PKK National Park (18䓎' - 18䓠'N;102䓦' - 102䓻'E), Laos was used as a research site. The birds and their habitats in the park were used as research objects. The species, quantity and distribution of birds were investigated. In addition, the distribution of vegetation and the relationship between bird’s community and habitat types in PKK National Park were studied. Species diversity and Abundance of birds at PKK National Park, was monthly assessed by point count method between January and December 2018. A total of 117 species of birds belonging to 43 families and 18 orders were found in the inspection areas. Among them, Passerine birds (60 species) and Non-Finches (57 species) were almost equal to each other, accounting for 51.3% and 48.7% of total birds species respectively. Again, Anseriformes birds account for the largest number amongst Non-Passeriformes, reaching 15 species, followed by Falconiformes, accounting for 20.5% of total. On the other hand, based on migratory habits, resident birds were found to be highest in our research site which account for 35.04% of total birds and followed by Summer Migratory birds (32.28%), Passage Migrant (23.93%) and Winter Migratory birds (6.83%). Through the quantitative measurement and analysis of various parameters, the focus is on the diversity of birds and species in the park. Further, the factors that can affect species diversity, especially the bird’s survival factors such as vegetation change pattern, transformation rate of green areas, recruitment and restoration pattern of wild animals, especially birds, and other beneficial

关键词： Laos Bird Community Environment Habitat Diversity

Effect of Gamma Irradiation Doses on Morphological and Biochemical Attributes of Grape Saplings

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Agricultural Sciences 2015年第5期6卷 505-512页

作者： A. F. M. saiful islam M. Muzahedul islam Md. Mehedi Hasan Md. Mehedi Hasan Department of Crop Botany & Tea Production Technology Sylhet Agricultural University Sylhet Bangladesh

The demand of grape in Bangladesh is fulfilled through import from foreign countries. The fruits of local cultivars of grapes are sour and seeded. Development of seedless grape varieties having increased sweetness, higher yield with better nutritional quality is necessary to reduce the import dependency. The present research activities are the part of a grape improvement project. A pot experiment was conducted at the Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh, during June to November 2011 to determine the suitable gamma irradiation doses on growth, leaf area and biochemical characters of grape saplings. Three vegetative bud stages viz. bud initiation stage, 4-leaf stage and 8-leaf stage, and four doses of gamma irradiation viz. 0, 5, 10, and 15 Gy were used as treatments. The experiment was laid out in a Randomized Complete Block Design with four replications. Different irradiation doses and vegetative bud stages showed significant variations in respect of plant growth characters, leaf area, soluble protein and total sugar content. Interaction effects also had significant variations on most of the parameters studied. Higher doses of gamma irradiation had showed detrimental effect on grape saplings. Generally, increased in irradiation doses showed decreased and detrimental effects on most of the parameters under study. Maximum numbers and length of roots, total dry matter, leaf area and chlorophyll-a and chlorophyll-b content were found at 5 Gy irradiation dose. Total soluble protein and sugar content of leaf were found maximum at no irradiation and 15 Gy, respectively. Higher number of roots and length, total dry matter, leaf area, chlorophyll-a, and b and soluble protein content of leaf were observed at bud initiation stage while 8-leaf stage showed maximum total sugar of leaf. In the combined effect of gamma irradiation and vegetative bud stages, all parameters showed best results in 5 Gy with bud initiation stage except total sugar content of

关键词： Grape Sapling Gamma Irradiation Morphological and Biochemical Parameters Leaf Area Soluble Protein