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( Rahman M Mizanur ),( Sungchul C Bai ) 한국수산과학회(구 한국수산학회) 2014 Fisheries and Aquatic Sciences Vol.17 No.2
Seven feeding trials were conducted to determine the effects of feeding rate and frequency in the Korean rockfish Sebastes schlegeli at seven different water temperatures. Two feeding-rate experiments for 5-g Korean rockfish at 17°C and 20°C; three feeding rate experiments for 16-g Korean rockfish at 16°C and 24°C; and finally, two feeding frequency experiments for 93- and 100-g at 15°C and 20°C were conducted. Twenty fish averaging 5.5 ± 0.2 g (mean ± SD) were randomly distributed into 18 indoor tanks containing 40-L seawater from a semi-recirculation system. Fish were fed a commercial diet for 4 weeks at water temperatures of 17°C and 20°C. Two feeding trials were conducted to determine the optimum feeding frequency in growing Korean rockfish reared at temperatures of 15°C and 19°C. Broken line regression analysis of weight gain (WG) indicated that the optimum feeding rates of 5-g growing Korean rockfish were 4.48% (BW/day; BW, body weight) at 17°C and 4.83% (BW/day) at 20°C. Broken line regression analysis of WG showed optimum feeding rates of 16-g juvenile Korean rockfish of 3.41% (BW/day) at 16°C, 3.75% (BW/day) at 20°C, and 3.34% (BW/day) at 24°C. The biological performance, results, along with morphological indices and serological characteristics, suggest that a feeding frequency of 1 meal/day was optimal to improve WG in growing Korean rockfish grown from 93 to 133 g at a water temperature of 15°C, and 100 to 132 g at 19°C.
Mizanur, Rahman M.,Bai, Sungchul C. The Korean Society of Fisheries and Aquatic Scienc 2014 Fisheries and Aquatic Sciences Vol.17 No.2
Seven feeding trials were conducted to determine the effects of feeding rate and frequency in the Korean rockfish Sebastes schlegeli at seven different water temperatures. Two feeding-rate experiments for 5-g Korean rockfish at $17^{\circ}C$ and $20^{\circ}C$; three feeding rate experiments for 16-g Korean rockfish at $16^{\circ}C$ and $24^{\circ}C$; and finally, two feeding frequency experiments for 93- and 100-g at $15^{\circ}C$ and $20^{\circ}C$ were conducted. Twenty fish averaging $5.5{\pm}0.2$ g ($mean{\pm}SD$) were randomly distributed into 18 indoor tanks containing 40-L seawater from a semi-recirculation system. Fish were fed a commercial diet for 4 weeks at water temperatures of $17^{\circ}C$ and $20^{\circ}C$. Two feeding trials were conducted to determine the optimum feeding frequency in growing Korean rockfish reared at temperatures of $15^{\circ}C$ and $19^{\circ}C$. Broken line regression analysis of weight gain (WG) indicated that the optimum feeding rates of 5-g growing Korean rockfish were 4.48% (BW/day; BW, body weight) at $17^{\circ}C$ and 4.83% (BW/day) at $20^{\circ}C$. Broken line regression analysis of WG showed optimum feeding rates of 16-g juvenile Korean rockfish of 3.41% (BW/day) at $16^{\circ}C$, 3.75% (BW/day) at $20^{\circ}C$, and 3.34% (BW/day) at $24^{\circ}C$. The biological performance, results, along with morphological indices and serological characteristics, suggest that a feeding frequency of 1 meal/day was optimal to improve WG in growing Korean rockfish grown from 93 to 133 g at a water temperature of $15^{\circ}C$, and 100 to 132 g at $19^{\circ}C$.
Influence of V2O5 Addition on the Magnetic Properties of Li-Zn Ferrites
M. Samir Ullah,Sm. Rubayatul Islam,M. Atikul Islam,M. Hassan,M. Firoz Uddin,M. Mizanur Rahman 한국자기학회 2023 Journal of Magnetics Vol.28 No.1
The structural property, bulk density and porosity of V2O5 (0.0, 0.4, 0.8 and 1.2 wt.%) added Li-Zn ferrites are observed along with the surface morphology. The samples have been prepared by the solid-state reaction technique and sintered at 1050 oC. The X-ray diffraction patterns of the prepared samples have shown the single phase cubic spinel structure. A microstructural study demonstrates that the grain size increases up to 0.8 wt.% V2O5 and slightly decreased thereafter for 1.2 wt.% V2O5 addition. The saturation magnetization value increases from 44.0 to 50.3 emu/g as the V2O5 content increases up to 0.8 wt.%. The decrease of magnetization for 1.2 wt.% V2O5 content is apparent and it is found to be 47.3 emu/g. This may be related to the dilution effect with the excess of non-magnetic V2O5. It is also observed that the value of initial permeability increases up to 0.8 wt.% V2O5.
A Study on Non Destructive Evaluation of the Steam Turbine L-0 Blades
Mizanur, Rahman Md.,Rezk, Osama,Ouma, Victor Otieno,Vaysidin, Saidov,Gomaa, M. Abdullatif,Jung, JaeCheon,Lee, YongKwan The Korean Society of Systems Engineering 2016 시스템엔지니어링학술지 Vol.12 No.1
The Nuclear and Fossil Steam Turbines record a considerable number of failures annually. Some of these failures reported are as result of blade failure. The failure of the L-0 blade in a Steam Turbine is one of the most reported blade failure in Nuclear and Fossil steam turbines. This paper seeks to identify the best Non Destructive Evaluation (NDE) method or methods to be used in the steam turbine L-0 blades inspection process. The development of systems engineering processes presents an opportunity to apply NDE inspection to the L-0 blades. This process apply computer modelling of the L-0 using ANSYS and by simulating the stresses experienced by the L-0 blade during operation it is possible to identify the most susceptible areas for crack formation and growth. The results from these models compared to industry data for validation. The analysis of these results used to predict the most probable failure location and failure modes. Therefore NDE inspection can be applied to these areas with greater degree of accuracy. This would be beneficial in the increasing the accuracy in the detection of cracks and hence save inspection time and the overall inspection cost. Furthermore, not only the location for crack formation and NDE inspection determined but also best the NDE inspection technique/techniques to be applied appropriately on the L-0 blade are prescribed.
Mizanur, Rahman Md.,Yun, Hyeonho,Moniruzzaman, M.,Ferreira, F.,Kim, Kang-Woong,Bai, Sungchul C. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.5
Three feeding trials were conducted to evaluate the effects of feeding rate and water temperature on growth and body composition of juvenile Korean rockfish, Sebastes schlegeli rearing at 3 different water temperatures. A total of 270 fish (each experiment) individual body weight (BW) averaging $16{\pm}0.3g$ ($mean{\pm}SD$) were fed a commercial diet for 4 wk at $16^{\circ}C$, $20^{\circ}C$, and $24^{\circ}C$. At each temperature, triplicate tanks were assigned to one of 6 feeding rates: 1.5%, 2.5%, 2.8%, 3.1%, 3.4%, and satiation (3.7% BW/d) at $16^{\circ}C$, 1.9%, 2.9%, 3.2%, 3.5%, 3.8% and satiation (4.1% BW/d) at $20^{\circ}C$ and 1.7%, 2.7%, 3.0%, 3.3%, 3.6%, and satiation (3.9% BW/d) at $24^{\circ}C$ water temperature. Weight gains of fish in satiation and 3.4% groups at $16^{\circ}C$, in satiation and 3.8% groups at $20^{\circ}C$ and in satiation and 3.6% groups at $24^{\circ}C$ were significantly higher than those of fish in the other treatments (p<0.05). A broken line regression analysis of weight gain indicated that optimum feeding rates of juvenile Korean rockfish were 3.41% at $16^{\circ}C$, 3.75% at $20^{\circ}C$ and 3.34% at $24^{\circ}C$ water temperature. Results of the present study indicate that the optimum feeding rate could be >3.1% but <3.41% at $16^{\circ}C$, >3.5% but <3.75% at $20^{\circ}C$ and >3.0% but <3.34% at $24^{\circ}C$. As we expected results suggest that fish performed better at $20^{\circ}C$ than $16^{\circ}C$ or $24^{\circ}C$ water temperature and the optimum feeding rate could be 3.1% BW/d to 3.7% BW/d in 16 g of juvenile Korean rockfish.
( S. M. Fatema Ferdousy ),( Md Mizanur Rahman ),( Shaheen Akhter ),( Kanij Fatema ),( Muzharul Mannan ) 대구대학교 한국특수교육문제연구소 2019 Asia-Pacific Journal of Intellectual Disabilities Vol.6 No.1
Autism is a neurodevelopmental disorder where genetic factors play causal role. This case-control study explored the association between perinatal and socioeconomic status with risk of autism. It was a case control study among children who came from different areas of the country during the period of 2005 to 2015 for assessment in the outdoor facility of Bangabandhu Sheikh Mujib Medical University. One hundred children were diagnosed autism by Autism Diagnostic Observation Schedule (ADOS)-Generic. Among them 79 were boys and 21 were girls. Another one hundred children without autism were taken as control, 65 of them were boys and 35 were girls. Perinatal and socioeconomic risk factors were analyzed in these two groups, using medical records. Mean age of the ASD children was 3.51+1.58 year and control was 3.80+1.53. Male predominance was observed in ASD children. After univariate analysis three significant variables identified to pose as risk for autism. These were parental advanced level of education (P=<0.001), urban residence (P=<0.001) and neonatal jaundice (P=<0.001). Variables like male sex, occupation as service holder and low birth weight at birth approached significance at the 0.05 level. Results suggested that parental profile as well as perinatal environment are associated with risk of autism and this factors act independently.
Rahaman Hafijur,Rahman Md. Mizanur,Islam A. K. M. Saiful,Huda Md. Durrul,Kamruzzaman Mohammad 한국농업기계학회 2022 바이오시스템공학 Vol.47 No.4
Purpose Rice covers most of the cropping area in Bangladesh which is mostly a labor-intensive crop. The conventional approach of rice transplanting is labor-intensive and requires hardship. Mechanization in transplanting is needed to make agriculture economical due to labor shortage and high wages of laborers. Cost-efective and easy to use, a mechanical rice transplanter is an excellent choice. Rice transplanting issues, technological limitations in the adoption of mechanical transplanter, and future research to make mechanical transplanter more user-friendly are summarized in this paper. Methods The articles were gathered and reviewed using search engines like Google Scholar, Scopus, Science Direct, Springer Link, Wiley Online, Taylor & Francis Online, Academia, and Research Gate. Indexed journals, conference proceedings, academic presentations, and thesis/dissertations are all included in this study’s scope. Results Maintaining the soil’s physical qualities is thought to aid in crop management and increase output. Although mechanical transplanters are more efective than their manual counterparts, they are not yet widely used due to factors such as expensive startup costs, a lack of experience in developing mat-type nurseries, and farmers’ weak fnancial conditions. When attempting to grow rice using mechanical transplants, it may be helpful to employ strategies including instructing technical competence, guaranteeing timely availability, boosting custom recruitment, and ofering government incentives. Conclusions A mechanized rice transplanter may be a viable option to alleviate labor shortages and minimize farm operating costs. However, slower acceptance is attributed to the difculty of cultivating paddy nurseries on trays and mats, as well as inadequate reaction from stakeholders, as mechanical rice transplanters are not widely used yet. Farmers would be more likely to plant seedlings in beds or trays if they could do so easily. Many landowners can beneft from the assistance of an entrepreneur in planting paddy at the same time. It is possible to increase the rate at which existing rice transplanter machines are put into use by providing adequate on-the-job training to relevant stakeholders in nursery preparation processes and planting machine handling. Bangladesh needs a rice transplanter that is both low-cost and simple to use. A low-cost, semi-automatic rice transplanter could be a solution for mitigating labor shortages and reducing farm operating expenses.