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1
Content available Calibration performance investigation of an uncalibrated indigenous artefact probing for five-axis machine tool
100%
Rahman M. M. , Mayer R.
Journal of Machine Engineering
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2016
|
tom Vol. 16, No. 1
33--42
EN
On machine measurement of artefacts such as single ball, multiple balls or even prismatic shape artefact is gaining popularity for the calibration of five-axis machine tools. However, calibration results can be degraded due to errors from different process variables such as the measurement strategies, rotary axes indexations and artefact dismount and remount cycles. This research investigates the repeatability of uncalibrated indigenous artefact probing and machine tool error parameters calibration against a number of process variables. Uncertainties of the estimated parameters are estimated to quantify the calibration quality.
2
Wpływ mycia wyporowego na zawartość ligniny i kwasu heksenuronowego w masie siarczanowej świerkowej
100%
Rahman M. M. , Potucek F.
Przegląd Papierniczy
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2018
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tom 74
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nr 09
3
Content available remote Transient convective flow of micropolar fluid past a continuously moving vertical porous plate in the presence of radiation
100%
Rahman M. M. , Sattar M. A.
International Journal of Applied Mechanics and Engineering
|
2007
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tom Vol. 12, no 2
497-513
EN
An unsteady convective flow and heat transfer of a micropolar fluid past a continuously moving verticaI porous plate with time dependent suction and in the presence of radiation has been analyzed numericaIly. With appropriate transformations the boundary layer equations are transformed into a set of nonlinear ordinary differentiaI equations. The locaI similarity solutions in time of the transformed dimensionless equations for the flow, microrotation and the heat transfer characteristics are evaIuated using the Nachtsheim-Swigert shooting iteration technique. NumericaI results are presented in the form of velocity, microrotation and temperature profiles within the boundary layer for different parameters entering into the analysis. FinaIly, the skin friction coefficient and rate of heat transfer are tabulated for the pertinent parameters.
4
Influence of displacement washing upon lignin and hexenuronic acid content of spruce kraft pulp
100%
Rahman M. M. , Potůček F.
Przegląd Papierniczy
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2018
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tom R. 74, nr 9
571--576
EN
The paper deals with the variation of the kappa number, lignin and hexenuronic acid content of the washed and unwashed spruce kraft pulp. The displacement washing was carried out with the spruce kraft pulp having seven level kappa number. It was notice able that the depletion of lignin content after washing depend supon the kappa number of the pulp. The most variation was found in the Klason lignin content of the pulp. The leaching of lignin was least for the pulp with the lowest kappa number. Hexenuronic acid composition of the unwashed pulp was hardly affected by the displacement washing.
PL
W artykule opisano wahania liczby kappa, zawartości ligniny i kwasu heksenuronowego przed i po myciu masy siarczanowej z drewna świerkowego. Mycie wyporowe zastosowano do masy siarczanowej świerkowej o siedmiu poziomach liczby kappa. Zaobserwowano, że spadek zawartości ligniny po myciu zależy od liczby kappa masy. Największe zmiany zaobserwowano w przypadku zawartości w masie ligniny Klasona. Wymywanie ligniny było najmniejsze w przypadku maso najniższej liczbie kappa. Mycie wyporowe miało znaczący wpływ na skład kwasu heksenuronowego w mytej masie.
5
Content available Measurement Accuracy Investigation of Touch Trigger Probe with Five-Axis Machine Tools
100%
Rahman M. M. , Mayer J. R. R.
Archive of Mechanical Engineering
|
2016
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tom Vol. LXIII, nr 4
495--510
EN
The touch trigger probe plays an important role in modern metrology because of its robust and compact design with crash protection, long life and excellent repeatability. Aside from coordinate measuring machines (CMM), touch trigger probes are used for workpiece location on a machine tool and for the accuracy assessment of the machine tools. As a result, the accuracy of the measurement is a matter of interest to the users. The touch trigger probe itself as well as the measuring surface, the machine tool, measuring environment etc. contribute to measurement inaccuracies. The paper presents the effect of surface irregularities, surface wetness due to cutting fluid and probing direction on probing accuracy on a machine tool.
PL
Elektrostykowe sondy przełączające grają istotną rolę we współczesnej metrologii z uwagi na ich zwartą i silną konstrukcję, odporność na uszkodzenia, długowieczność i doskonałą powtarzalność. Obok zastosowań we współrzędnościowych maszynach pomiarowych (CMM), sondy te są wykorzystywane do wyznaczenia położenia przedmiotu obrabianego na obrabiarce i oceny dokładności obrabiarek. Tak więc, dokładność pomiaru jest sprawą istotną dla użytkowników. Do powstawania niedokładności pomiaru przyczynia się sama sonda, a także powierzchnia pomiarowa, obrabiarka, środowisko pomiarowe itp. W artykule przedstawiono wpływ nierówności powierzchni, wilgotności powierzchni powodowanej obecnością chłodziwa i kierunku sondowania na dokładność pomiaru na obrabiarce.
6
Content available Sodium carbonate pre-extraction of Trema orientalis in the production of paper grade pulp
80%
Jahan M. S. , Sarkar M. , Rahman M. M.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2015
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tom 58
|
nr 195
EN
To increase the profitability of the pulp and paper industry, additional value added products from lignocelluloses are needed, and consistent with this goal, a biorefinery concept based on the sodium carbonate pre-extraction of Trema orientalis prior to pulping was proposed. The solid content in the sodium carbonate pre-extracted liquor was much lower than the hot water pre-extraction, which affected the pre-hydrolysis yield and overall pulp yield positively. The alkaline pre-extraction had a beneficial effect on delignification in the subsequent soda-AQ-pulping. In addition, the alkaline pre-extraction improved the pulp bleachability. The papermaking properties of the alkaline pre-extracted soda-AQ pulp were very close to non-extracted pulp after D0EpD1 bleaching.
7
Content available Contributing variables for sustainable livelihood status of the char women in Bangladesh
80%
Al-Amin S. , Rahman M. M. , Miah M. A. M.
Journal of Agribusiness and Rural Development
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2012
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nr 01[23]
EN
The main purpose of the study was to determine the contribution of variables to the sustainable livelihood status of char women. The sustainable livelihood status of a char woman was measured by computing a “sustainable livelihood status score” which is considering six major aspects of her livelihoods: food security, ability to provide family education, health and sanitation, shelter and family assets, clothing condition and social upliftment. Data were collected from 200 randomly selected char women by using interview schedule in two Upazilla of Jamalpur district in Bangladesh during November 2006 to March 2007. More than two-fifths (67.5 per cent) of the char women were found under “medium sustainable livelihood status” compared to more than one-fifth (20.5 per cent) of them belongs to ‘low sustainable livelihood status’ and only 12 per cent to “high sustainable livelihood status”. Pearson correlation test depicted that out of 16 variables, 13 had significant positive relationships with the sustainable livelihood status. Results of stepwise multiple regression analysis revealed that five variables namely, annual income, agricultural knowledge, income generating activities, family education and organizational participation contributed significantly which combindly explained 76.3 per cent of total variation to the sustainable livelihood status. Path analysis indicated that these variables had both direct and indirect effects to the sustainable livelihood status. Women who had more annual income, better agricultural knowledge, participation in income generating activities, more family education and more organizational participation were found to better sustainable livelihood status in char area. Government or concern other authorities need to give attention to these variables for any sustainable livelihood upliftment programme.
PL
Głównym celem badania było określenie udziału zmiennych wpływających na zrównoważony poziom życia kobiet z terenów zalewowych. Pomiaru zrównoważonego poziomu życia dokonano w oparciu o wskaźnik, który uwzględniał sześć zmiennych: bezpieczeństwo żywnościowe, zdolność do zapewnienia edukacji rodzinie, zdrowie i warunki sanitarne, schronienie i majątek rodziny, stan odzieży oraz poprawę sytuacji społecznej. Dane do badania pochodzą z wywiadu przeprowadzonego w okresie od listopada 2006 roku do marca 2007 roku wśród 200 losowo wybranych kobiet z terenów zalewowych z dwóch dystryktów Bangladeszu: Upazila i Jamalpur. Ponad połowa (67,5%) kobiet z terenów zalewowych określiła swój poziom życia jako średni, podczas gdy według 1/5 (20,5%) poziom ich życia był niski. Tylko 12% określiło swój poziom życia jako wysoki. Współczynnik korelacji Pearsona wykazał, że spośród 16 zmiennych 13 miało dodatni, istotny statystycznie, wpływ na badane zjawisko. Wyniki analizy regresji krokowej wykazały, że pięć zmiennych: dochód roczny, wiedza rolnicza, działalność generująca dochód, wykształcenie rodziny oraz uczestnictwo w organizacjach w 76,3% wyjaśniło zmienność w ocenie poziomu życia. Analiza ścieżkowa wykazała, że zmienne te wywierają zarówno bezpośredni, jak i pośredni wpływ na badane zjawisko. Grupa kobiet o większych rocznych dochodach, lepszej wiedzy rolniczej i wykształceniu, uczestniczących w działalności generującej dochód oraz częściej uczestniczących w organizacjach, charakteryzowała się wyższym poziomem życia. Konieczne jest, aby rząd i inne instytucje, odpowiedzialne za prowadzoną politykę, w programach mających na celu podniesienie poziomu życia zwracały uwagę na te aspekty, które, zgodnie z wynikami przeprowadzonego badania, przyczyniają się do poprawy poziomu życia kobiet na terenach zalewowych w Bangladeszu.
8
Content available Factors contribution to the adoption of production technologies by potato growers in northwest Bangladesh
80%
Uddin A. B. M. S. , Rahman M. M. , Alam M. B. , Kamaly M. H. K.
Journal of Agribusiness and Rural Development
|
2014
|
nr 03[33]
9
Content available Developmental expression and hormonal regulation of male-specific yellow protein mRNA in adults of the desert locust, Schistocerca gregaria
80%
Begum M. , Rahman M. M. , Huybrechts R. , De Loof A.
Pestycydy
|
2008
|
nr 1-2
35-41
EN
Adult males of Schistocerca gregaria turn yellow when they become sexually mature. This is due to the deposition in the cuticle of a male-specific Yellow Protein (YP), of which the amino acid sequence is known. Yellowing only happens in crowd-reared (gregarious) males, and results from the deposition of a specific ‘Yellow Protein’. If individual males (solitarious) are isolated after the adult emergence, they become sexually mature but they do not turn yellow. On the basis of a partial YP-mRNA sequence, we established a reverse transcriptase polymerase chain reaction (RT-PCR) assay to study the developmental expression of YP in crowd-reared males, isolated-reared males and females. In crowd-reared adult males the transcription of YP gene started from day 5 on, and reached a maximum at day 12. The effects of juvenile hormone (JH), insulin (bovine), corazonin, ecdysone and 20 0H-ecdysone (20E) on the regulation of YP-mRNA synthesis were also investigated. JH made the cuticle turn yellow and, as shown by RT-PCR, YP-mRNA was induced. The effect of 100 μg JHIII was stronger than that of 10 μg. Insulin was only effective in inducing YP-mRNA synthesis at high dose (19 μg) and after more days (18 d). Corazonin and 20E made the cuticle turn black, but no YP-mRNA synthesis was observed. Ecdysone (10 and 100 μg) showed no effect on body coloration and YP-mRNA. Thus, JH was found to be the most potent inducer among the hormones tested.
10
Content available Sodium carbonate pre-extraction of Trema orientalis in the production of paper grade pulp
80%
Jahan M. S. , Sarkar M. , Rahman M. M.
Drewno : prace naukowe, doniesienia, komunikaty
|
2015
|
tom vol. 58, nr 195
69--78
EN
To increase the profitability of the pulp and paper industry, additional value added products from lignocelluloses are needed, and consistent with this goal, a biorefinery concept based on the sodium carbonate pre-extraction of Trema orientalis prior to pulping was proposed. The solid content in the sodium carbonate pre-extracted liquor was much lower than the hot water pre-extraction, which affected the pre-hydrolysis yield and overall pulp yield positively. The alkaline pre-extraction had a beneficial effect on delignification in the subsequent soda-AQ-pulping. In addition, the alkaline pre-extraction improved the pulp bleachability. The papermaking properties of the alkaline pre-extracted soda-AQ pulp were very close to non-extracted pulp after D0EpD1 bleaching.
11
Effect of cholymbi on growth, proximate composition, and digestive enzyme activity of fingerlings of long whiskered catfish, Mystus gulio (Actinopterygii: Siluriformes: Bagridae)
80%
Rajkumar M. , Rahman M. M. , Prabha A. R. , Phukan B.
Acta Ichthyologica et Piscatoria
|
2013
|
tom 43
|
nr 1
EN
Background. Long whiskered catfish, Mystus gulio (Hamilton, 1822), enjoys a high consumer preference and market demand in many Asian countries including India. However, the growth of this fish is very slow under normal aquaculture conditions. The non-hormonal growth promoter—cholymbi—which contains minerals and the essential amino acids lysine and methionine, is widely used in livestock and poultry as a feed additive to improve growth and survival. Supplementing feed with cholymbi may increase the growth and survival of Mystus gulio. Materials and Methods. A feeding trial was conducted to determine the effect of dietary cholymbi supplementation on growth, survival, and feed conversion ratio of long whiskered catfish fingerlings. Four isoproteic diets (crude protein 37%) were formulated to incorporate cholymbi at 0%, 0.25%, 0.50%, and 0.75% diet. The diets were fed to triplicate groups of fish twice daily to supply 5% of the total body weight per day for 120 days. Water quality parameters were maintained within the range suitable for catfish growth. Results. Weight gain (WG), protein efficiency ratio (PER) and feed conversion ratio (FCR) were all affected by diet (P < 0.01, 0.001, and 0.001, respectively). The group fed the 0.50% cholymbi diet had the highest WG and PER and the lowest FCR, although not significantly different from the group fed the 0.25% cholymbi diet. There was no significant difference (P > 0.05) in carcass proximate composition of catfish fed diets containing these different levels of cholymbi. Gut protease, amylase, and lipase activities were stimulated by dietary inclusion of cholymbi at all levels compared to control. Conclusion. As cholymbi is a newly introduced dietary supplement for fish, more research is needed to optimize its supplementation to improve growth, PER, FCR, and survival of long whiskered catfish. Until then, a diet with 0.50% cholymbi can be recommended to improve the aquaculture production of this species.
12
Adsorption Behavior of Reactive Dye from Aqueous Phase on Activated Carbon
70%
Khan M. R. , Rahman M. M. , Mozumder M. S. I. , Uddin M. J. , Islam M. A.
Polish Journal of Chemistry
|
2009
|
tom Vol. 83, nr 7
1365-1378
EN
The adsorption of a reactive dye (Procion Red) from aqueous solution onto activated carbon was investigated. The effect of contact time, pH, adsorbent dosage and temperature were studied. The equilibrium data were described well by both Langmuir and Freundlich isotherm model. The adsorption kinetics was tested for pseudo-first-order, pseudo-sec - ond order, intraparticle diffusion and unified approach kinetic models. The unified approach model de scribed the kinetic data in accor dance with the experimental data and the forward and backward rate constants were evaluated from the model fittings. The adsorption is highly pH dependent and adsorption efficiency in creases with the decrease in pH. Thermodynamic parameters of the adsorption process suggested that the process was endothermic. The adsorption capacity of regenerated activated carbon showed more than 70 percent recovery of the adsorption efficiency of the initial virgin adsorbent.
13
Molecular identification of Vibrio alginolyticus causing vibriosis in shrimp and its herbal remedy
61%
Hannan M. A. , Rahman M. M. , Mondal M. N. , Dep S. H. , Chowdhurz G. , Islam M. T.
Polish Journal of Microbiology
|
2019
|
tom 68
|
nr 4
14
Anti-oxidant effect of Flemingia stricta Roxb. leaves methanolic extract
51%
Biozid M. S. , Alam M. N. , Abeden M. J. , Chowdhury A. I. , Faruk M. , Ferdous K. U. , Nitul I. A. , Rahman M. M.
European Journal of Biological Research
|
2018
|
tom 08
|
nr 4
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