Bangladesh Journal of Scientific and Industrial Research最新文献_第4页

Proximate composition and thermal properties of hemp and flax fibres 大麻和亚麻纤维的近似组成和热性能

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-03-27 DOI: 10.3329/bjsir.v58i1.64236

M. Rahman, Md. Mizanur Rahman, K. Nemoto, A. Sarwar

{"title":"Proximate composition and thermal properties of hemp and flax fibres","authors":"M. Rahman, Md. Mizanur Rahman, K. Nemoto, A. Sarwar","doi":"10.3329/bjsir.v58i1.64236","DOIUrl":"https://doi.org/10.3329/bjsir.v58i1.64236","url":null,"abstract":"Along with the apparel or clothing industry, diversified uses of natural lignocellulosic fibre are getting popularity in many fields e.g., composites, automotive, marines, aerospace, electronics, civil construction, nanotechnology, biomedical, etc. The property and uses of textiles are determined by their constituent fibre properties. The proximate composition and thermogravimetric analysis (TGA) data of a total of 9 local hemp and flax genotypes (3 and 6, respectively) were carried out to understand their suitability in different applications. A wide variation was observed in the ash content of hemp and flax fibres varied from 1.7 to 17.7%, crude protein 3.27 to 9.02%, crude fibre 26.51 to 55.32%, ether extract 2.6 to 20.9% and energy value 284.44 to 383.96 kcal 100–1 g. In TGA analysis, all the fibres showed a similar trend. The flax genotypes contain lower ash and ether extract and higher DM, crude carbohydrate and crude fibre than hemp genotypes. Therefore, flax could be used in the lightweight composite, textile, pulp and cellulose-based industries. The hemp fibre had higher ash which was reflected by a higher residue at 500oC in TGA analysis. To understand the viability of these flax fibres, further investigations are needed.\u0000Bangladesh J. Sci. Ind. Res. 58(1), 65-70, 2023","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47613274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energy audit of a sugarcane plant to find out the main energy saving opportunities 对甘蔗厂进行能源审计，找出主要节能机会

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-03-27 DOI: 10.3329/bjsir.v58i1.61901

H. Abroshan, S. Rezaei, H. Golchoobian, F. Foladi, Ehsan Rumizade, A. Mirshams

引用次数: 0

Acute toxicity of the aqueous extract of Aloe barbadensis miller gel 芦荟凝胶水提取物的急性毒性

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-03-27 DOI: 10.3329/bjsir.v58i1.65110

F. Abderrahmane, S. Addou, I. Labadie, O. Kheroua

引用次数: 1

Electronic, structural and optical properties of Gd-doped ZnO powder synthesized by solid-state reaction method 固相反应法制备Gd掺杂ZnO粉体的电子、结构和光学性能

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-03-27 DOI: 10.3329/bjsir.v58i1.63634

Mahendra Kumar Gora, Arvind Kumar, B. L. Choudhary, S. N. Dolia, Sanjay Kumar, R. Singhal

{"title":"Electronic, structural and optical properties of Gd-doped ZnO powder synthesized by solid-state reaction method","authors":"Mahendra Kumar Gora, Arvind Kumar, B. L. Choudhary, S. N. Dolia, Sanjay Kumar, R. Singhal","doi":"10.3329/bjsir.v58i1.63634","DOIUrl":"https://doi.org/10.3329/bjsir.v58i1.63634","url":null,"abstract":"We explored the impact of Gd doping on the structural, electronic and optical characteristics of the ZnO powder. The Gd-doped ZnO (0, 2% and 5%) powder samples have been synthesized using the conventional solid-state reaction process with varied Gd concentrations. The XRD pattern confirmed that all the studied samples are in the hexagonal wurtzite crystalline structure. The morphology has been explored using SEM images, which exhibited an agglomerated rod-like particle structure. The XPS results indicate the presence of oxygen vacancies (Vo) in the Gd-doped ZnO samples and the Vo’s are found to increase with increasing Gd amount. According to PL findings, the intensity ratio of the green and ultra-violet emission peaks is found to increase from 0.090 to 0.418 with increasing Gd-doping concentrations, confirming that Vo’s are increasing with Gd-doping. The UV-visible spectroscopy results reveal that the energy band gap (Eg) decreased from 3.31 eV to 3.23 eV with increasing Gd-doping concentration.\u0000Bangladesh J. Sci. Ind. Res. 58(1), 53-64, 2023","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46436077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantification of components of textile fabrics by using chemometric techniques with FT-NIR spectroscopic data 利用FT-NIR光谱数据的化学计量技术对纺织织物成分进行定量分析

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2022-12-25 DOI: 10.3329/bjsir.v57i4.63377

M. Uddin, Sk Ray, MS Islam, M. Karim, M. Jahan

引用次数: 0

Manufacturing system optimization using computer-based control kanban loops 利用计算机控制看板循环优化制造系统

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2022-12-25 DOI: 10.3329/bjsir.v57i4.61400

Chukwuedozie N. Ezema, Nnenna Harmony Nwobodo-Nzeribe, J. Eneh, Uche Chinweoke Ogbuefi, M. J. Mbunwe, B. Anyaka, J. N. Ngene

引用次数: 0

Quality assessment of shoe lining leather collected from a few footwear factories 几家制鞋厂生产的鞋革质量评价

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2022-12-25 DOI: 10.3329/bjsir.v57i4.63376

Y. Mahmud, Maryam Razzaq

引用次数: 0

Antioxidant, thrombolytic, cytotoxic and antibacterial activities of leaves of Vitex peduncularis 毛茛叶的抗氧化、溶栓、细胞毒性和抗菌活性

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2022-12-25 DOI: 10.3329/bjsir.v57i4.62651

MS Islam, MA Al Mansur, SA Rakhi, M. Sarkar, M. Kuddus, F. Ahmed

{"title":"Antioxidant, thrombolytic, cytotoxic and antibacterial activities of leaves of Vitex peduncularis","authors":"MS Islam, MA Al Mansur, SA Rakhi, M. Sarkar, M. Kuddus, F. Ahmed","doi":"10.3329/bjsir.v57i4.62651","DOIUrl":"https://doi.org/10.3329/bjsir.v57i4.62651","url":null,"abstract":"Vitex peduncularis (Verbenaceae), a perennial tree, is locally utilized for possessing multifaceted pharmacological properties including analgesic, antimalarial, anti-angina, antidiabetic, antioxidant, anti-inflammatory and hepatoprotective. Hence, this study aims to evaluate their antioxidant, thrombolytic, cytotoxic and antibacterial activities from the methanolic crude extract and its various solvent fractions. Data from antioxidant and thrombolytic assay displayed that Kupchan partitioned chloroform soluble fraction revealed the maximum phenolic content (73.39 mg of GAE/g of extract), DPPH free radical scavenging activity (26.69 μg/ml) and thrombolytic activity (37.35%). In brine shrimp lethality evaluation, the LC50 values indicate that the most cytotoxic compound was found to be from ethyl acetate soluble fraction (LC50 6.73 μg/ml). Finally, antibacterial activity of different fractions showed that both chloroform and methanolic fraction possessed mild activity against the tested bacteria. The potential biological effects of the crude fractions have been demonstrated demanding future studies of the isolated compounds to assess these activities.\u0000Bangladesh J. Sci. Ind. Res. 57(4), 239-246, 2022","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44329163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Ship disaster threatened environmental security and dwindled down the spirit of maritime Sri Lanka 船舶灾难威胁到环境安全，削弱了斯里兰卡的海洋精神

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2022-12-25 DOI: 10.3329/bjsir.v57i4.59704

S. Sivaramanan, S. Kotagama

{"title":"Ship disaster threatened environmental security and dwindled down the spirit of maritime Sri Lanka","authors":"S. Sivaramanan, S. Kotagama","doi":"10.3329/bjsir.v57i4.59704","DOIUrl":"https://doi.org/10.3329/bjsir.v57i4.59704","url":null,"abstract":"The MV Xpress-Pearl ship disaster was a maritime environmental security threat that occurred on the Southwest coast of Sri Lanka during this decade. The wreck consists of tonnes of nitric acid, several other chemicals, and oils such as tonnes of bunker fuel oil, gas oil, and tanks full of lubricating oil. Also, several containers occupied with plastic nurdles that escaped have affected the west and southern coastal belt of Sri Lanka. Carcasses of dead endangered turtles, dolphins and various other rare marine organisms washed ashore, such as beaches of Uswetakeiyawa, Panadura, Unawatuna, Wellawatte, Moratuwa, and Induruwa. Besides, experts believe that it may take a long term to completely recover from the impacts including safe plastic nurdle-free seafood. Green peace USA has purported a list of conditions to be updated, such as the implementation of the plastic pallet free water act and placing plastics into the hazardous material category. The study used the qualitative content analysis technique to reconcile plastic pollution caused by the disaster as an environmental problem. Since plastic pollution is also a repercussion of two known keystone environmental problems, such as urbanization and human population increase.\u0000Bangladesh J. Sci. Ind. Res. 57(4), 199-206, 2022","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48834656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study of unsteady flow past compound cylinders 复合汽缸非定常流场的数值研究

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2022-12-25 DOI: 10.3329/bjsir.v57i4.58987

M. Mosallem, Haitham M. Hadidi, Mohammed Y. Tharwan, Zeinab A. Ahmed

{"title":"Numerical study of unsteady flow past compound cylinders","authors":"M. Mosallem, Haitham M. Hadidi, Mohammed Y. Tharwan, Zeinab A. Ahmed","doi":"10.3329/bjsir.v57i4.58987","DOIUrl":"https://doi.org/10.3329/bjsir.v57i4.58987","url":null,"abstract":"The flow over compound cylinders is simulated using computational fluid dynamic (CFD). Three contacting cylinders of different diameters, arranged in tandem with respect to the oncoming flow were examined at Reynolds number ReD = 333 based on the diameter of the middle cylinder, D. The proposed configuration simulates the wind flow over the satellite launch vehicles during the period of launch. Computations were performed for diameter-to-diameter ratio, d / D, of 0.8 and 0.6. The numerical results revealed the vortex formation and vortex shedding mechanism in the wake downstream of the cylinders. For d / D = 0.6, the near wake is wider than that of d / D = 0.8. It is also found that the base pressure coefficient values for d / D = 0.6 are lower than those for d / D = 0.8. These findings imply that the acting drag force on the cylinders for d / D = 0.6 is larger than that for d / D = 0.8. Concluding that, the base pressure coefficient depends on the diameter ratio d / D whereas, the computed vortex-shedding Strouhal number value was found to be 0.25 and is independent on the d / D ratio.\u0000Bangladesh J. Sci. Ind. Res. 57(4), 215-220, 2022","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48497749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0