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    Wyświetlanie 1-9 z 9
    Tytuł:
    Diurnal seismic ambient noise and seismic station performance characterization in the Bengal Basin, Bangladesh
    Autorzy:
    Zannat, Naharin
    Farazi, Atikul Haque
    Kamal, A. S. M. Maksud
    Rahman, Md. Zillur
    Hossain, Md. Shakhawat
    Powiązania:
    https://bibliotekanauki.pl/articles/27310143.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    seismic ambient noise
    power spectral density
    noise energy
    noise sources
    seismic station
    Bengal Basin
    Opis:
    Seismic ambient noise (SAN) energy can potentially blur regional and teleseismic arrivals as well as various microearthquakes at specific frequencies. Therefore, quantification of the SAN energy level in a region is required to optimize seismic station distribution for seismological investigations. Moreover, evaluation of station performance and noise source is possible from observation of SAN energy levels. The SAN energy distribution from seismic stations in the Bengal Basin (BB), Bangladesh has not yet been estimated. At the same time, this tec-tonically active and complex region is less studied using seismic methods. This study aims to quantify SAN ener-gy and characterize its diurnal variation along with evaluating station performance at 11 seismic stations, which were temporarily installed in the deeper portion of the BB. Herein, the daily SAN energy level was determined within the period range of 0.02–30 s by estimating the power spectral density (PSD) of seismic data for 7 continu-ous days. SAN energy and its variation over time were observed using the probability density functions (PDFs) of PSDs and spectrograms, respectively. The sources of SAN energies at different period bands were also investigat-ed by comparing the PSDs with daily variations in human activities, nearby noise sources, local meteorological factors (i.e., air temperature and precipitation), and sea level height. The insights from this study could be useful for the future deployment of seismic networks as well as seismological studies in the BB.
    Źródło:
    Geology, Geophysics and Environment; 2023, 49, 3; 209--224
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Allometric scaling of marbofloxacin pharmacokinetics: a retrospective analysis
    Autorzy:
    Yohannes, S.
    Hossain, M.A.
    Kim, J.Y.
    Lee, S.J.
    Kwak, D.M.
    Suh, J.W.
    Park, S.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/31939.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The association between physiologically dependent pharmacokinetic parameters (CLB, T1/2β, Vdss) of marbofloxacin and body weight was studied in eight animal species based on allometric equation Y = aWb, where ‘Y’ is the pharmacokinetic parameter, ‘W’ is body weight, ‘a’ is allometric coefficient (intercept) and ‘b’ is the exponent that describes relation between pharmacokinetic parameter and body weight. The body clearance of marbofloxacin has shown significant (P<0.0001) relation with size (Bwt) in various animal species. However, half-life and volume of distribution were not in association with body weight. Although half-life and volume of distribution were not in a good correlation with body weight, statistically significant association between the body clearance and body weight suggests validity of allometric scaling for predicting pharmacokinetic parameters of marbofloxacin in animal species that have not been studied yet. However further study considering large sample size and other parameters influencing pharmacokinetics of marbofloxacin is recommended.
    Źródło:
    Polish Journal of Veterinary Sciences; 2014, 17, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A cross sectional survey on health and nutritional status among the people of Chittagong city corporation, Bangladesh
    Autorzy:
    Jakaria, M.
    Hasan, M.
    Hossain, M.S.
    Hasanat, A.
    Sayeed, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1917281.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Health
    Chittagong city
    nutritional status
    survey
    Respondents
    Opis:
    Purpose: To determine the health and nutritional status of people in the Chittagong city corporation area of Bangladesh. Materials and methods: A face-to-face interview methodology was used for this survey. The study sites were located in 15 thanas of the Chittagong city corporation area. The study was also designed with interview questions closely related to health.Results: Among the total 620 respondents, 453 respondents were males and 167 respondents were females. 471(75.96%) of the total respondents had positive comments about the health status of their community. 169(27.52%) respondents had poor or fair appetites but the rest of them had good, very good or excellent appetites. 360(58.07%) of the respondents reported they had been eating a minimum of one fruit per day and 85(13.7%) people drank 5 to 8 glasses of water daily. 441(71.12%) of their diets more or less met daily vitamin and nutrient requirements and 338(54.51%) were nonsmokers. 407(65.64%) were married, and 388 (62.58%) were more or less satisfied about their sexual life. 441(71.12%) respondents performed physical exercise more or less habitually. A lower number of respondents had a major disease. For instance, 155(25%) suffered from high blood pressure, and 150(24.19%) suffered from diabetes. In the case of minor diseases, 399(64.35%) of the respondents had been suffering from GIT disease and 416(67.09%) were taking proton pump inhibitors or a H2 receptor blockers. 205(33.06%) respondents were taking antibiotics regularly.Conclusions: One third of the people had hypertension and diabetes. According to the biomedical concepts, peoples were not healthy. However, according to the ecological and psychological concepts of health, this survey proved that the people of the Chittagong city corporation area were comparatively healthy.
    Źródło:
    Progress in Health Sciences; 2015, 5, 1; 114-119
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of climate change on rice production at Khulna District, Bangladesh
    Autorzy:
    Hossain, N.
    Saifullah, A.S.M.
    Bhuiyan, S.H.
    Uddin, N.
    Rahman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049750.pdf
    Data publikacji:
    2019
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    rice
    production
    climate change
    trend analysis
    Bangladesh
    gross domestic product
    Mann-Kendall (MK) test
    Rice Production
    Opis:
    In Bangladesh 164 million people depend on rice but due to climate change (CC) vulnerabilities the yield of rice is severely reducing. Therefore, this study aimed to explore the effects of CC on rice yield using recent trend analysis, Mann-Kendall (MK) trend test and correlation. For this study, the required climate and selected rice production data were collected from Bangladesh Meteorological Department (BMD) and Department of Agriculture Extension (DAE), Khulna. In time series statistics both parametric and nonparametric methods were applied to detect a monotonic trend of climatic variability and Aman rice production. Correlation between climatic variability and rice production was also investigated. The study exposed that the temperature and rainfall had an increasing trend and statistically significant whereas the relative humidity found decreasing. Overall, the bright Sunshine had positive trend but week. According to nonparametric trend test of climatic variability and Aman yield only minimum temperature showed a positive trend which found statistically significant. In contrast, Mann-Kendall trend test revealed that rainfall had positively significant while temperature had negative significant. The correlation revealed the Aman production is a strong response with minimum temperature whereas the Lona Coche showed a positive correlation with maximum temperature. The variation of Aman production exhibited a positive correlation with both Rainfall and humidity respectively and Lona Coche found a negative correlation. The sunshine had a week correlation against both yields. The findings suggest should give attention of temperature-tolerant rice varieties to mitigate possible adverse effects of CC.
    Źródło:
    Environment, Earth and Ecology; 2019, 3, 1; 42-54
    2543-9774
    2451-4225
    Pojawia się w:
    Environment, Earth and Ecology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preconditiong and Inoculation of Low Sulphur Grey Iron
    Autorzy:
    Hossain, Md Sojib S.
    Bazlur B. Rashid, A. K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380548.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grey iron
    metallography
    mechanical properties
    cementite
    preconditioner
    inoculant
    żeliwo szare
    metalografia
    właściwości mechaniczne
    cementyt
    Opis:
    For quality grey cast iron production, the challenging issues are to avoid cementite structure and obtain the desired graphite morphology with proper matrix as well as hardness. The objective of the present research is to find out the right combination of preconditioner and inoculant that may help to overcome the challenges. In this work, sulphur content is kept low (0.01%). Two preconditioners namely metallurgical SiC and zirconium bearing FeSi with two types of inoculant are individually used to make four combinations of sample and for each case metal is poured into the green sand mould. Finally Brinell hardness and graphite morphology is observed in the thickest and thinnest portions of the castings. Metallurgical SiC with barium bearing inoculant gives better graphite morphology and hardness than strontium bearing inoculant, on the other hand zirconium bearing FeSi gives more satisfying result than SiC with every type of inoculant. Among all of the combinations Zr bearing preconditioner with Ba bearing inoculant gives good graphite morphology with best mechanical properties in both thickest and thinnest portions of the casting.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 61-66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An effective medium ratio obeying meta-atom for multiband applications
    Autorzy:
    Hossain, M. J.
    Faruque, M. R. I.
    Islam, M. T.
    Islam, S. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/201192.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    compact
    effective medium ratio
    meta-atom
    multiband
    kompakt
    średni wskaźnik efektywności
    Opis:
    In this paper, an effective medium ratio obeying, negative refractive index, compact meta-atom was designed, manufactured and tested for operation in a multiband microwave regime. The proposed meta-atom structure obeyed better effective medium ratio. The results of the measurement were verified by the commercially available Computer Simulation Technology (CST) Studio Suite 2014 simulator. The effective medium ratio obeying meta-atom displayed multiband response, in conjunction with negative refractive index property over a certain frequency band in the microwave frequency span. Furthermore, a few parametric analyses were completed with the meta-atom, and the effective medium parameters were investigated. The sizes and complex scattering constitutive parameters of the proposed negative refractive index, compact meta-atom are applicable for multiband applications in microwave regime.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 139-147
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In Situ Solution Process for Fabricating Thermally and Mechanically Stable Highly Conductive ZnO-CNT Fiber Composites
    Autorzy:
    Hossain, M.
    Son, S.
    Hahn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033363.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    Opis:
    A simple in situ solution process was developed to produce a mechanically and thermally stable ZnO-carbon nanotube fiber composite. ZnO nanoparticles were homogeneously deposited onto the surfaces of and interstices within CNT fibers (between individual CNTs). X-ray photoelectron spectroscopy and Raman analysis revealed that ZnO nanoparticles contained oxygen vacancy defects and CNT fibers included oxygen containing functional group that strongly interacted with Zn. The strong interaction enhanced the mechanical properties of the composite fibers. The Young modulus (20 GPa) and tensile strength (118 MPa) were enhanced compared to the corresponding values of the pristine CNT fibers. The thermal stability was high up to 880°C and light absorption was enhanced across the UV to near IR region in a ZnO-CNT fiber composite. The electrical conductivity of the composite was high up to 954 S/cm despite semiconductor deposition.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 124-132
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foliar application of salicylic acid improves growth and yield attributes by upregulating the antioxidant defense system in Brassica campestris plants grown in lead-amended soils
    Dolistna aplikacja kwasu salicylowego wpływa korzystnie na parametry wzrostu i plonowania roślin Brassica campestris rosnących w glebie zanieczyszczonej ołowiem poprzez pozytywną regulację systemu obrony antyoksydacyjne
    Autorzy:
    Hasanuzzaman, M.
    Matin, Md.A.
    Fardus, J.
    Hasanuzzaman, Md.
    Hossain, Md.S.
    Parvin, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/28053.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    Lead (Pb) toxicity causes a severe impact on plant growth and productivity. A protective role of salicylic acid (SA) is well known under different abiotic stress conditions. However, very little is known about the SA-induced Pb resistance mechanism. In this study, we investigated the effect of SA on mustard plants (Brassica campestris L.) under Pb-stress conditions. Plants were exposed to three levels of Pb amendment to the soil (0.25, 0.50, 1.00 mM), with or without SA (0.25 mM). Plant growth, yield attributes, and yield at harvest were reduced depending on the severity of the Pb stress. Exogenous application of SA improved plant growth and yield. Biochemical data revealed that Pb toxicity resulted in higher oxidative damage by reducing nonenzymatic antioxidants such as ascorbate and glutathione at the higher dose of Pb treatment. Antioxidant enzymes (ascorbate peroxidase – APX, monodehydroascorbate reductase – MDHAR, dehydroascorbate reductase – DHAR, glutathione reductase – GR, guaiacol peroxidase – POD, glutathione S-transferase – GST, and catalase – CAT) responses varied with the Pb doses. Both the nonenzymatic and enzymatic components of the antioxidant defense system were upregulated after application of SA, resulting in lower oxidative damage under Pb-stress conditions. Taken together, the results suggest that exogenous application of the SA mitigates Pb-induced oxidative damage and consequently results in better growth and yield in mustard plants.
    Toksyczność ołowiu (Pb) wywiera silny wpływ na wzrost i produktywność roślin. Ochronna rola kwasu salicylowego (SA) jest dobrze znana w warunkach różnych stresów abiotycznych. Jednak niewiele wiadomo na temat indukowanego SA mechanizmu oporności na Pb. W przeprowadzonych badaniach określiliśmy wpływ SA na rośliny gorczycy (Brassica campestris L.) w warunkach stresu wywołanego Pb. Rośliny poddano działaniu trzech poziomów Pb wprowadzonych do gleby (0,25, 0,50, 1,00 mM), z lub bez SA (0,25 mM). Wzrost, wskaźniki plonowania oraz plon roślin uległy zmniejszeniu w zależności od nasilenia stresu indukowanego Pb. Egzogenna aplikacja SA wpłynęła na poprawę wzrostu i plonowania roślin. Wyniki analiz biochemicznych wykazały, że toksyczność Pb powodowała większe uszkodzenia oksydacyjne związane z obniżeniem zawartości nieenzymatycznych antyoksydantów, takich jak askorbinian i glutation, w obecności wyższych stężeń tego metalu. Aktywność enzymów antyoksydacyjnych (peroksydazy askorbinianowej – APX, reduktazy monodehydroaskorbinianowej – MDHAR, reduktazy dehydroaskorbiniano- wej – DHAR, reduktazy glutationowej – GR, peroksydazy gwajakolowej – POD, S-transferazy glutationowej – GST i katalazy – CAT) była uzależniona od stężenia Pb. Zarówno nieenzymatyczne, jak i enzymatyczne elementy systemu obrony antyoksydacyjnej były pozytywnie regulowane po zastosowaniu SA, co powodowało mniejsze uszkodzenia oksydacyjne występujące w warunkach stresu Pb. Podsumowując, uzyskane wyniki sugerują, że egzogenna aplikacja SA łagodzi uszkodzenia oksydacyjne wywołane obecnością Pb, a w konsekwencji prowadzi do lepszego wzrostu i plonowania gorczycy w warunkach ekspozycji na różne poziomy stresu indukowanego Pb.
    Źródło:
    Acta Agrobotanica; 2019, 72, 2
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic modeling of the isoamyl acetate reactive distillation process
    Autorzy:
    Ali, S. S.
    Hossain, SK. S.
    Asif, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/778351.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    reactive distillation
    process simulator
    isoamyl acetate
    dynamic modeling
    disturbance
    Opis:
    The cost-effectiveness of reactive distillation (RD) processes makes them highly attractive for industrial applications. However, their preliminary design and subsequent scale-up and operation are challenging. Specifically, the response of RD system during fluctuations in process parameters is of paramount importance to ensure the stability of the whole process. As a result of carrying out simulations using Aspen Plus, it is shown that the RD process for isoamyl acetate production was much more economical than conventional reactor distillation configuration under optimized process conditions due to lower utilities consumption, higher conversion and smaller sizes of condenser and reboiler. Rigorous dynamic modeling of RD system was performed to evaluate its sensitivity to disturbances in critical process parameters; the product flow was quite sensitive to disturbances. Even more sensitive was product composition when the disturbance in heat duties of condenser or reboiler led to a temperature decrease. However, positive disturbance in alcohol feed is of particular concern, which clearly made the system unstable.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 1; 59-66
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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