http://dspace.daffodilvarsity.edu.bd:8080/handle/123456789/1509 2026-04-05T17:28:33Z 2026-04-05T17:28:33Z Jafrin, Shamina Dilruba, F. A. Uddin, Md. Kamal Gomes, Isidore Islam, Md. Emdadul http://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/488 2019-05-28T09:47:09Z 2009-01-01T00:00:00Z

USES OF NATURAL FRUIT (DIOSPYROS EMBRYPTERIS PERS) AS A ROT-PROOFING AGENT Jafrin, Shamina; Dilruba, F. A.; Uddin, Md. Kamal; Gomes, Isidore; Islam, Md. Emdadul Two different types of hessian fabrics (sized and desized) were treated with unripe natural fruit juice ( Botanical Name: Diospyros embrypteris Pers) and copper sulphate solution. The physico-chemical properties of the treated fabrics were determined and made nursery pots for seedling to improve the longevity of rot-proof nursery pot. It was observed that 5% copper sulphate solution treated nursery pots posseses longevity 5.5 months but the extract of natural fruit juice mixed with 5% copper sulphate solution treated sample increases the longevity of nursery pot about eleven months. At the same time 8% copper sulphate solution treated nursery pots longevity more than nine months but natural fruit juice mixed with 8% copper sulphate solution treated nursery pot is required to achieve longevity about fourteen months. Uses of natural fruit gaab have no critical steps to environment, free from health hazard and durable. That’s why it has some potentiality to use for making nursery pots with less chemical materials .

2009-01-01T00:00:00Z Jafrin, Shamina Azad, Md. Abul Kalam http://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/487 2019-05-28T09:47:09Z 2009-01-01T00:00:00Z

STUDY ON THE EFFECT OF SIZE MATERIAL ON JUTE-COTTON UNION FABRIC Jafrin, Shamina; Azad, Md. Abul Kalam A study was performed on the jute- cotton union fabric to show the effect of sizing on the properties of union fabric. Here, the cotton yarn was used in the warp direction and jute yarn was used in the weft direction. The size material was used only for warp yarn that is for cotton yarn. From the experimental results, it was seen that the strength of the sized union fabric was better than the unsized union fabric although the other properties were similar to each other. Comparing the properties of union fabric with 100% cotton fabric, union fabric (jute-cotton) may be the replacement of 100% same category of cotton fabric.

2009-01-01T00:00:00Z Amin, Md. Nurul Ali, Mohd. Yousuf Salequzzaman, Md. http://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/486 2019-05-28T09:47:11Z 2009-01-01T00:00:00Z

IDENTIFICATION AND IMPACT ANALYSIS OF INVASIVE SPECIES: A CASE STUDY IN THE MONGLA SEA PORT AREA OF BAGERHAT DISTRICT OF BANGLADESH Amin, Md. Nurul; Ali, Mohd. Yousuf; Salequzzaman, Md. Manipulation through invasion is a major problem in most of the port areas in recent world. Mongla is an important sea port that has accomplished the activities like import and export of various goods inside and outside Bangladesh. The process not only involves the moving of goods, it also carries the invasive species purposely or accidentally which invading to the new location of the Mongla port area through exploration and colonization with varieties diversity and scale. The paper identifies the invasive species and analyses the causes and ways of invasion in the coastal waters with possible impacts of invasion in the Mongla Port area. To achieve the objectives of the research, different aquatic species were collected by random sampling from the confluence of the River Passur Mongla port and the adjacent area around the Sundarbans from September 2006 to April 2007. The fishermen and local communities including indigenous people were interviewed to explore the invasion situation. The research reveals that ballast water of cargo ships is one of the means of invasion of the coastal waters of Mongla Port. Aquaculture is another reason of invasion due to introduction of many exotic fishes and shrimp species such as Pangus (Pangasius sutchi ), African Magur (Clarias gariepinus), Tilapia (Tilapia mossambica) and Nilotica (Oreochromis niloticus) etc. that have the active roles for altering the aquatic ecosystem of Mongla Port. Finally, the research also finds out some possible environmental impacts caused by those invasive species.

2009-01-01T00:00:00Z Nuruzzaman, D. M. Nakajima, A Mawatari, T http://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/485 2019-05-28T09:47:11Z 2009-01-01T00:00:00Z

EXPERIMENTAL INVESTIGATION ON ROLING-SLIDING CONTACT PROPERTIES OF WC CERMET COATINGS Nuruzzaman, D. M.; Nakajima, A; Mawatari, T In this study, tribological properties of Hi-HVOF sprayed WC-Cr-Ni cermet coatings were investigated experimentally under lubri-cated rolling-sliding contact. Coatings were deposited onto the induction hardened carbon steel and carburized hardened steel materials. Substrate surfaces were prepared by axially grinding, blasting and circumferentially grinding. Under the operating conditions of contact pres-sure PH=1.4 GPa and slip ratio s=-28.0%, the effects of substrate hardness and substrate sur-face kind on the tribological properties of the cermet coating were examined. It was found that cermet coating showed a long life and durability was not influenced by the substrate hardness and substrate surface kind. It was also found that during the running-in process, oil film formation was hardly influenced by the substrate hardness and substrate surface kind. On the other hand, surface hardness and surface roughness of the coating were more influenced in the case of circumferentially ground substrate than that in the case of axially ground or blasted substrate. In addition, coating material loss was very high in the case of circumferentially ground substrate when the substrate material was induction hardened carbon steel.

2009-01-01T00:00:00Z