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Talukder, Niladri,Lee, Ki Yong Elsevier 2018 Fuel Vol.234 No.-
<P><B>Abstract</B></P> <P>Laminar flame speeds and Markstein lengths of methyl decanoate (MD)-air mixtures were measured within a range of equivalence ratio at different elevated pressures and temperatures using outwardly propagating spherical flames developed inside a constant volume combustion chamber. Shadowgraph technique was employed to observe the temporal evolution of flame fronts. A numerical scheme was used to justify all the experimental data of laminar flame speeds. The numerical scheme was developed based on a short mechanism of methyl decanoate oxidation. A sound agreement was observed between the numerical predictions and experimentally obtained data of laminar flame speeds. Markstein lengths were calculated to quantify the effect of stretch on the flame front at different initial conditions. The study provided viable data of laminar flame speeds and Markstein lengths of methyl decanoate-air flames at different initial conditions which were also well conforming to the established theories of conventional fuels regarding of the effects of equivalence ratio, pressure, and temperature variation on laminar flame speed.</P>
Talukder, Anup Kumar,Rahman, Md. Ataur,Islam, Md. Taimur,Rahman, Abu Nasar Md. Aminoor The Korean Society of Embryo Transfer 2015 한국동물생명공학회지 Vol.30 No.1
This study was aimed to determine the biometry of genital organs, incidence of gynecological disorders and pregnancy loss in Black Bengal goat (Capra hircus). Genitalia of 118 does were collected from local abattoirs. Biometric parameters of genital organs were measured and gross and histopathological examinations were carried out for detection of abnormalities. For gravid uterus, age of the fetus was determined by measuring crown-rump length. There was no significant difference in the length, width and weight of right and left ovaries (P>0.05). However, the number of follicles between left ($5.3{\pm}2.3$) and right ovaries ($7.4{\pm}2.7$) varied significantly (P<0.05). The mean length of right fallopian tube and uterine horn were not varied with those of left fallopian tube and uterine horn. The length of uterine body, cervix and vagina were $1.3{\pm}0.1cm$, $3.3{\pm}0.5cm$ and $6.8{\pm}1.3cm$, respectively. Overall, 29 (24.6%) genitalia had abnormalities. Fifteen genitalia (12.7%) had ovarian abnormalities including ovaro-bursal adhesions (6.8%), parovarian cyst (5.1%) and follicular cyst (0.9%). Uterine abnormalities were found in 12 genitalia (10.2%) and predominant uterine lesion was endometritis (6.8%) followed by adenomyosis (1.7%), hemorrhagic lesion on endometrial surface (0.9%) and cyst in broad ligament (0.9%). In addition, cyst in fallopian tube (0.9%) and vagina (0.9%) were recorded. The proportion of slaughtered pregnant goats was 15.3% (18/118). The pregnancy wastage was highest in the first month (50.0%) followed by second (33.3%) and third (16.7%) month. It can be concluded that ovaro-bursal adhesions, parovarian cyst and endometritis are the gynecological disorders of major concern in Black Bengal goat.
Talukder M. A. H.,Islam M. K.,Munir M. S.,Salahuddin M. 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.1
The photoelectric efects on the instability of the current-driven dust ion-acoustic (DIA) waves in a collisional and streaming dusty plasmas are theoretically investigated using fuid model with dust charge fuctuation considering dust grains as negatively charged. It is found that the photoelectric efects through dust charge fuctuation give the growth of the DIA waves beside the damping efects of collision and streaming of the plasma species. Growth rate of the DIA waves are numerically investigated using the values of appropriate plasma parameters.
Normal and Abnormal Fertilisation of Zebu Cattle Oocytes In Vitro
Talukder, Anup Kumar,Shamsuddin, Mohammed,Rahman, Mohammad Bozlur,Bari, Farida Yeasmin,Parish, John J 韓國受精卵移植學會 2009 한국동물생명공학회지 Vol.24 No.2
Successful in vitro embryo production heavily relies on the normal maturation and fertilisation of oocytes. We examined the normal and abnormal fertilisation of zebu cattle oocytes matured in vitro. Immature cumulus oocyte complexes (COCs) from zebu cattle ovaries at slaughter were matured in vitro (IVM) for 24 h. The oocytes were either fixed, stained and examined for nuclear changes or fertilised in vitro (IVF) with Percoll-separated, heparintreated spermatozoa (1.0 /mL) of zebu (n = 7) and crossbred bulls (n = 7). After 18 h of sperm-COCs co-incubation at C with 5% in humidified air, the presumptive zygotes were fixed, stained and examined for pronuclei. The number of oocytes retrieved per ovary was 5.4 0.7. The percentage of matured oocytes was 73.0. The difference in motility of spermatozoa before and after Percoll seperation was significant (p<0.001). The percentages of normal and abnormal fertilisation (polyspermia and oocytes with one pronucleus) varied significantly depending on individual bulls (p<0.05). A protocol for IVF of IVM oocytes in Bangladeshi zebu cattle is developed. A future study may elucidate the capacity of such IVM-IVF oocytes to develop to the blastocyst stage for transfer to surrogate mother.
Niladri Talukder,이기용 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.4
Laminar flame speeds of n-butanol/air premixed flames were measured experimentally and numerically at elevated pressures and temperatures for a wide range of equivalence ratios. Laminar flame speeds were obtained experimentally from the temporal evaluation of the flame front of spherically outwardly propagating flames at zero stress rate. The shadowgraph technique was employed to gain optical access to the constant volume combustion chamber. Flame propagation images were captured by a high-speed camera and MATLAB codes were used to process the images and calculate laminar flame speeds. Flame speeds have been calculated numerically using CHEMKIN-Pro based on a short reaction mechanism for n-butanol oxidation, which was derived from a previously published full reaction mechanism. Numerical predictions were in qualitative agreement with experimental data. The effects of initial pressure and temperature elevation were analyzed. Also, the effect of simultaneous elevation of initial pressures and temperatures is documented. For all experimental conditions, the maximum flame speed was found at around equivalence ratio 1.1. In general, flame speeds decreased with the elevation of initial pressure and increased with initial temperature elevation.