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Md. Mahmudur Rahman,A. K. M. Ashiquzzaman Shawon,Soon‑Chul Ur 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.1
Zintl compounds were recognized as very good thermoelectric candidate due to their characteristics electron-crystal phononglassproperties. Mg3Sb2is a known Group II–V Zintl semiconductor. This compound is a well-established thermoelectricmaterial and many of recent works focus on this compound due to its intrinsic low thermal conductivity. The band gap ofthis compound has been shown to be optimum, making it a promising thermoelectric material. This work introduces a newsynthetic method and analyzes the thermoelectric properties found using this method. The single phase of Mg3Sb2wassynthesized by melting elemental shots at 1173 K for 1 hour in a controlled inert Ar gas atmosphere in a tapped graphitecrucible followed by vacuum hot pressing at 873 K for 4 hours. X-ray diffraction and scanning electron microscopy werecarried out to investigate existing phases and surface morphology respectively. Thermoelectric properties in terms of Seebeckcoefficient, electrical conductivity, and thermal conductivity were evaluated and the results are discussed in comparison toanalogous studies. Transport properties were also evaluated and discussed. Single phase magnesium antimonide was foundwith a nominal formula of Mg3.8Sb2and showed a comparable ZT value which is ~ 0.24 at 873 K.
Rahman, Md. Siddiqur,Alam, Nur,Rahman, A.K.M. Anisur,Huque, A.K.M. Fazlul,Ahasan, Md. Shamim,Song, Hee-Jong The Korean Society of Veterinary Service 2009 韓國家畜衛生學會誌 Vol.32 No.3
A cross sectional survey was conducted to determine the seroprevalence of brucellosis in cattle in Bangladesh Agricultural University (BAU) Veterinary Clinics, in BAU Dairy Farm and Vabokhali from June 2008 to November 2008. A total of 200 serum samples were collected from BAU Veterinary Clinic, from BAU Dairy Farm and Vabokhali. Among the serum samples 143 sera samples were collected from BAU Veterinary Clinic, 42 serum samples from BAU Dairy Farm and 15 serum samples from Vabokhali. Sera were separated from blood samples and tested with specific Brucella abortus antigen (BAA) test and B. melitensis antigen (BMA) test. The overall seroprevalence of brucellosis in cattle was 5% in BAA and 0.5% in BMA. It was observed that, a significant higher prevalence of B. abortus was found in female than male. An insignificant higher prevalence of brucellosis was found in adult cattle (aged above 5 years), in cross breed cattle, in cattle with grazing, cattle breed by natural breeding, and in pregnant cows. Although insignificant but a higher prevalence of brucellosis was found in aged cattle than young cattle, cross bred cattle, pregnant cattle than non pregnant cattle, cattle with grazing. A higher prevalence of brucellosis was found in female cattle than male.
Prevalence and risk factors of helminth infections in cattle of Bangladesh
Rahman, A.K.M.A.,Begum, N.,Nooruddin, M.,Rahman, Md. Siddiqur,Hossain, M.A.,Song, Hee-Jong The Korean Society of Veterinary Service 2009 韓國家畜衛生學會誌 Vol.32 No.3
A cross-sectional survey was undertaken to identify risk factors and clinical signs associated with parasitic helminth infections of cattle in Mymensignh district of Bangladesh. A nonrandom convenience sampling method was used to select 138 animals from 40 farmers/herds. The eggs per gram of faeces (epg) for nematodes and trematodes were determined by McMaster and Stoll's methods respectively. Animal-level and herd-level data were recorded by means of a questionnaire. Multi-collinearity amongst explanatory variables were assessed using $2{\times}2{\times}\;X^2$ test and one variable in a pair was dropped if $P{\leq}0.05$ formultiple logistic regression models. Association study between outcome and explanatory variables was conducted using classification tree, random forests and multiple logistic regression. A positive epg was considered as infected. Analyses were performed using $STATA^{(R)}$, version 8.0/Intercooled and $R^{(R)}$, Version 2.3.0. Seventy eight percent of the cattle were found to be infected with at least one type of helminth. Twenty four pairs of combinations of explanatory variables showed significant associations. Male animals (OR=3.3, P=.006, 95% CI=1.4, 7.7) were associated with significantly increased prevalence of nematode infection. Female cattle of the study area are mostly cross-breed, kept indoor, fed relatively good diet and not used for draught purpose. Males are used for draught purpose thereby more exposed to nematode infective stage and provided with relatively poor diet. So stressed male cattle may become more susceptible to nematode infection. All of the three statistical techniques selected gender and lumen motility as most important variables in association with nematode infection in cattle. The result of this survey can only be extrapolated to the periurban cattle population of traditional management system.
( Md. Abdul Kahir ),( Md. Mazharul Islam ),( A. K. M. Anisur Rahman,),( A. Nahar ),( Md. Siddiqur Rahman ),( Hee Jong Song ) 한국가축위생학회 2008 韓國家畜衛生學會誌 Vol.31 No.4
A cross-sectional study was undertaken to report prevalence and to identify risk factors of subclinical mastitis of dairy cattle in Sylhet district of Bangladesh. Among 325 dairy farms of the district 12 farms(3.7%) were selected conveniently for this study. All the dairy cows of the 12 farms were selected for sample collection. Fresh milk samples from each of the selected dairy cows were collected aseptically in separate sterilized test tube as RF, RH, LF and LH quarter of the udder. Rapid modified White Side Test(WST) was used to detect subclinical mastitis(SCM). Results of WST and data derived from filled in questionnaire were entered in Microsoft Excel 2003 and transferred to STATA®, version 8.0/Intercooled (Stata Corporation, Texas, USA, 2003). The overall prevalence of SCM and its distribution in different categories of variables in cow and their exact binomial 95% confidence intervals were calculated in STATA®. Simple bivariable associations among independent variables were investigated by χ2 test in STATA®. Multiple logistic regression analysis with backward elimination method was used to identify risk factors of SCM. To identify significant variation in quarter SCM, linear regression analysis was performed after arcsine trans-formation of the data. The overall prevalence of SCM found in this study is 54%. Dairy cows with teat lesions had significantly increased SCM(OR=12342, P value=0.000, 95% CI=762, 199798) than others without teat lesions. The Holstein FriesianXJerseyXSahiwal breed has significantly decreased(OR=0.18, p=0.03, 95% CI 0.04, 0.85) SCM than other breeds. The prevalence of SCM found in this study is in agreement with others. The injury in the teat increases the probability of getting infected with microbes and thereby mastitis. If the prevalence of teat lesion can be decreased the probability of subclinical mastitis will also be decreased. The negatively associated Holstein FriesianXJerseyXSahiwall breed may help in planning mastitis control program if this finding can be validated by a more powerful case-control or cohort study design.
Rahman, Md. Siddiqur,Jahan, Nusrat,Hossain, Mohammad Arif,Uddin, M.J.,Shil, Niraj Kanti,Islam, KBM Saiful,Ahasan, Md. Shamim,Rahman, A.K.M. Anisur,Song, Hee-Jong The Korean Society of Veterinary Service 2008 韓國家畜衛生學會誌 Vol.31 No.4
Brucella spp. are small, non-motile Gram-negative coccobacilli known to cause disease in a number of vertebrate species including humans and brucellosis is one of the world's major zoonoses, alongside bovine tuberculosis and rabies. There are about 33.55 million goats and 1.16 million sheep in Bangladesh. The sheep and goats can significantly play an important role in the economic well being of the resource-poor farmer in Bangladesh. Sexually matured 362 female small ruminants(300 goats and 62 sheep) were examined. Approximately 3-5 ml of blood was collected from the jugular vein of each animal and sera samples were prepared. Samples were then tested for brucellosis by using Rose Bengal test(RBT), plate agglutination test(PAT) and tube agglutination test(TAT). Among 362 small ruminants, irrespective of species(sheep or goat), diagnosed highest in TAT, 2.21%(n=8) and lowest both by RBT & PAT, 1.93%(n=7) and it is concluded that TAT is superior than RBT and PAT.
( Md. Siddiqur Rahman ),( Nusrat Jahan ),( Mohammad Arif Hossain ),( M. J. Uddin ),( Niraj Kanti Shil ),( KBM Saiful Islam ),( Md. Shamim Ahasan ),( A. K. M. Anisur Rahman ),( Hee Jong Song ) 한국가축위생학회 2008 韓國家畜衛生學會誌 Vol.31 No.4
Brucella spp. are small, non-motile Gram-negative coccobacilli known to cause disease in a number of vertebrate species including humans and brucellosis is one of the world`s major zoonoses, alongside bovine tuberculosis and rabies. There are about 33.55 million goats and 1.16 million sheep in Bangladesh. The sheep and goats can significantly play an important role in the economic well being of the resource-poor farmer in Bangladesh. Sexually matured 362 female small ruminants (300 goats and 62 sheep) were examined. Approximately 3-5ml of blood was collected from the jugular vein of each animal and sera samples were prepared. Samples were then tested for brucellosis by using Rose Bengal test(RBT), plate agglutination test(PAT) and tube agglutination test(TAT). Among 362 small ruminants, irrespective of species(sheep or goat), diagnosed highest in TAT, 2.21%(n=8) and lowest both by RBT & PAT, 1.93%(n=7) and it is concluded that TAT is superior than RBT and PAT.
Characteristics of bovine pulmonary parasites in Bangladesh
Rahman, A. K. M. Anisur,Begum, Nurjahan,Rahman, Md Siddiqur,Song, Hee-Jong The Korean Society of Veterinary Service 2009 韓國家畜衛生學會誌 Vol.32 No.1
In a cross-sectional abattoir survey of bovine pulmonary diseases in Mymensingh, during September 2001 to April 2002, subclinical Dictyocaulus viviparous infection was found in mesoendemic level in Bangladeshi adult zebu cattle. The number of mature lung worms varied from $1{\sim}18$ in individual lungs. One to five mature lung worms were most frequent (74.2%) followed by 6 to 10(19.3%) and $11{\sim}18$ (6.5%). Of the total 123 mature worms collected from 31 lungs, there were 50 (40.7%) male and 73 (59.3%) female worms. The female lungworms (mean length 14.41mm) were significantly (P<0.01) larger than the male lungworms (mean length 11.28mm). The number of hydatid cysts varied from $1{\sim}80$ in individual lungs. One to five ($1{\sim}5$) cysts were recorded most commonly (76.0%) followed by $11{\sim}80$ (20.0%) and $6{\sim}10$ (4%). The size (diameter) of the hydatid cysts ranged from $2{\sim}12cm$. Of the total 203 hydatid cysts collected from 31 lungs 45 (22.2%) cysts were fertile and 158 (77.8%) cyst were sterile.