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    Tytuł:
    Calibration performance investigation of an uncalibrated indigenous artefact probing for five-axis machine tool
    Autorzy:
    Rahman, M. M.
    Mayer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99523.pdf
    Data publikacji:
    2016
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tools
    robustness
    uncertainty
    artefact
    Opis:
    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.
    Źródło:
    Journal of Machine Engineering; 2016, 16, 1; 33-42
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement Accuracy Investigation of Touch Trigger Probe with Five-Axis Machine Tools
    Badania dokładności pomiarów elektrostykową sondą przełączającą na obrabiarkach pięcioosiowych
    Autorzy:
    Rahman, M. M.
    Mayer, J. R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/139534.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    probing
    machine tool
    touch probe
    repeatability
    measurement inaccuracy
    sondowanie
    obrabiarka
    sonda stykowa
    powtarzalność
    niedokładność pomiaru
    Opis:
    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.
    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.
    Źródło:
    Archive of Mechanical Engineering; 2016, LXIII, 4; 495-510
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sodium carbonate pre-extraction of Trema orientalis in the production of paper grade pulp
    Autorzy:
    Jahan, M.S.
    Sarkar, M.
    Rahman, M.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/52662.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    sodium carbonate
    alkaline pre-extraction
    Trema orientalis
    production
    paper pulp
    dissolved biomass
    pulping
    bleaching
    paper property
    paper industry
    pulp industry
    Opis:
    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.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2015, 58, 195
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contributing variables for sustainable livelihood status of the char women in Bangladesh
    Czynniki determinujące zrównoważony poziom życia kobiet z terenów zalewowych Bangladeszu
    Autorzy:
    Al-Amin, S.
    Rahman, M.M.
    Miah, M.A.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/43936.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
    Opis:
    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.
    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.
    Źródło:
    Journal of Agribusiness and Rural Development; 2012, 23, 1
    1899-5241
    Pojawia się w:
    Journal of Agribusiness and Rural Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developmental expression and hormonal regulation of male-specific yellow protein mRNA in adults of the desert locust, Schistocerca gregaria
    Autorzy:
    Begum, M.
    Rahman, M.M.
    Huybrechts, R.
    De Loof, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/55232.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    Schistocerca gregaria
    yellow protein
    phase transition
    juvenile hormone
    polymorphism
    body colour
    adult
    yellow colouration
    insulin
    male
    sex determination
    insect
    hormonal regulation
    sex hormone
    desert locust
    Opis:
    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.
    Źródło:
    Pestycydy; 2008, 1-2; 35-41
    0208-8703
    Pojawia się w:
    Pestycydy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors contribution to the adoption of production technologies by potato growers in northwest Bangladesh
    Wpływ różnych czynników na dobór technologii produkcji ziemniaków w północno-zachodnim Bangladeszu
    Autorzy:
    Uddin, A.B.M.S.
    Rahman, M.M.
    Alam, M.B.
    Kamaly, M.H.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/44076.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
    Źródło:
    Journal of Agribusiness and Rural Development; 2014, 33, 3
    1899-5241
    Pojawia się w:
    Journal of Agribusiness and Rural Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    bKash vs. Bank-led Option: Factors Influencing Customer’s Preferences – Does it Warrant Voluntary-Insurance-Policy for Rapid-growth Digital-banking in Bangladesh-economy?
    Autorzy:
    Rahman, Akim M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046424.pdf
    Data publikacji:
    2020-11-09
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
    Tematy:
    Bank-led digital
    digital-transaction
    bKash
    Voluntary Insurance
    digital-banking
    percived risk-factor
    Opis:
    In today’s technology-driven world-economy, banking-services have been modernized where customers compete for comparative time-saving-options. Bangladesh, a developing country, is no exception. Besides traditional banking, Agent-banking, bKash, Western-Union etc. serve new-way financial-services. But, in 21st-Century business-mentality era, many factors are unpredictable. Strict laws & application can marginalize the magnitudes of Perceived-risk where developed countries are ahead of developing countries. But it does not guarantee risk-free digital-transaction where developing countries are vulnerable. It might have led a slower growth of digital-banking in countries like Bangladesh. Dealing with determinant Perceived-risk, current author proposed Voluntary-Insurance policy (Rahman, 2018) that deserves to be scrutinized. Using Factor Analysis and Hypothesis Testing on customers’ opinions helps identifying factors that have undermined the growth-trend of bank-led digital. Attributes “Phone call confirmation” has influenced customer’s preference using bKash. “No transaction fee” has influenced using bank-led digital. Addressing risk-factors, Voluntary-Insurance in place can ensure secured digital-banking that can enhance growth of usages digital-banking.
    Źródło:
    Journal of Banking and Financial Economics; 2020, 1(13); 51-69
    2353-6845
    Pojawia się w:
    Journal of Banking and Financial Economics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A review of the configuration and performance limitation parameters in optical amplifiers
    Autorzy:
    Ab-Rahman, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/173365.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    semiconductor optical amplifiers (SOA)
    erbium-doped fibre amplifier (EDFA)
    Raman
    amplifier
    Opis:
    Optical amplifiers are realised in a wide range of applications, such as metro – dense wavelength division multiplexing and cable television networks. These applications require the amplifier to provide a maximum output power level by accepting an input power near the saturation level. To obtain an ideal amplifier according to several parameters, the erbium concentration in the composite core glass, the optimum length of the fibre, the pump saturation and the input signal signaltonoise ratio must be critically studied and addressed. In this paper, we will review the types of optical amplifiers used in communication systems today as well as the parameters that limit the performance of optical amplifiers in the network, such as the noise figure, the gain saturation, the polarisation dependence gain and inhomogeneous broadening effects. Based on the performance limitation factor, we model the amplifier gain profile and the effect of the gain value on the network performance. Finally, we propose various configurations of an optical amplifier, and the advantages of each amplification technique are highlighted.
    Źródło:
    Optica Applicata; 2014, 44, 2; 251-266
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Driveless Gyroscope Response of a Quartz Piezoelectric Vibratory Tuning Fork
    Autorzy:
    Abdel-Rahman, M.
    Albassam, B.
    Alduraibi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193399.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.85.+j
    Opis:
    In this paper, we report on the observation of a gyroscope response in the absence of drive oscillator circuitry in a single ended quartz piezoelectric tuning fork. The tuning fork gyroscope was fabricated by conventional photolithography and wet etching techniques. The tuning fork length is 4 mm and the stem length is 2 mm; the tuning fork width and thickness are 0.4 mm and 0.35 mm, respectively. The measured gyroscope sensitivity and signal to noise ratio were 0.22 mV/°/s and 40, respectively, at a rotational rate of 60 °/s.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1352-1354
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A probabilistic model of Ancient Egyptian writing
    Autorzy:
    Nederhof, M.-J.
    Rahman, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/103801.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Podstaw Informatyki PAN
    Tematy:
    Ancient Egyptian
    writing systems
    language models
    Opis:
    This article offers a formalization of how signs form words in Ancient Egyptian writing, for either hieroglyphic or hieratic texts. The formalization is in terms of a sequence of sign functions, which concurrently produce a sequence of signs and a sequence of phonemes. By involving a class of probabilistic automata, we can define the most likely sequence of sign functions that relates a given sequence of signs to a given sequence of phonemes. Experiments with two texts are discussed.
    Źródło:
    Journal of Language Modelling; 2017, 5, 1; 131-163
    2299-856X
    2299-8470
    Pojawia się w:
    Journal of Language Modelling
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Radiological Dose around a 3-MW TRIGA Mark-II Research Reactor
    Autorzy:
    Rahman, A. F. M. M.
    Shamsuzzaman, M.
    Rahman, M. S.
    Uddin, K.
    Yeasmin, S.
    Nazmul, Haque H. M.
    Akramuzzaman, M. M.
    Chakraborty, S. R
    Powiązania:
    https://bibliotekanauki.pl/articles/412377.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    source term
    release rate
    TRIGA Mark-II reactor
    dispersion
    ingestion and deposition of radionuclide
    Gaussian plume model
    dose calculations
    Opis:
    A hypothetical accidental case of a 3-MW TRIGA Mark-II research reactor has been assumed to assess the radiological consequences due to the deposition of 137Cs and 90Sr on ground, vegetation, milk and meat. The air concentrations in sixteen cardinal directions have been estimated where the maximum concentration has been found to be at 110 m distance from the core of the reactor for all the directions. Calculated maximum doses of 137Cs, 90Sr and both 137Cs and 90Sr have been found to be within the ranges of 0.005-0.014 μSv hr–1, 0.013-0.036 μSv hr–1 and 0.018-0.05 μSv hr–1, respectively for all the directions, which are below the measured background dose limit 0.25 μSv hr–1 and also within the IAEA acceptable dose rate limit of 0.5 μSv hr–1. The calculated low doses due to the aforementioned radionuclides can be considered negligible with regard to the radiation hazards. The relationship between total effective dose rate for various pathways (i.e. immersion, inhalation, ground deposition, and ingestion of contaminated vegetation, milk, meat) and air concentration in all the directions has been established. Obtained relation reveals that the total effective dose rate is directly proportional to the air concentration, and the overall proportionality constants for 137Cs and 90Sr radionuclides have been obtained as 0.57 and 0.28, respectively. This study might provide information on the radiological safety required for the radiation protection purposes of the people living in the vicinity of the reactor site.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 10, 2; 183-200
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Schwarz-Pick theorem and its applications
    Autorzy:
    Qazi, M. A.
    Rahman, Q. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/747151.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    Bernstein’s inequality
    functions of exponential type in a half-plane
    rational functions
    Schwarz-Pick theorem
    Opis:
    Various derivative estimates for functions of exponential type in a half-plane are proved in this paper. The reader will also find a related result about functions analytic in a quadrant. In addition, the paper contains a result about functions analytic in a strip. Our main tool in this study is the Schwarz-Pick theorem from the geometric theory of functions. We also use the Phragmen-Lindelof principle, which is of course standard in such situations.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2011, 65, 2
    0365-1029
    2083-7402
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Propagation of threatened climber species Entada rheedii Spreng. – a medicinal plant with extremely thick and hard seed coat
    Autorzy:
    Hossain, M.A.
    Dey, J.
    Rahman, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078264.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Entada rheedii
    germination potential
    growth performance
    pre-sowing treatments
    rooting abil-
    ity
    rooted cuttings
    Opis:
    The study explored propagation techniques of Entada rheedii Spreng., a threatened medicinal climber species with extremely hard seed coat. Propagation trials included both pre-sowing treatments of seeds for germination and clonal propagation by stem cutting. Pre-sowing treatments included (a) soaking of both cut (notched) and uncut (intact) seeds in water for 0 h, 24 h, 48 h, and 72 h and (b) immersion of intact seeds in 5% acetone solution for 5 min, 10 min, and 20 min before sowing in germination media in polybags. On the other hand, stem cutting involved treating the summer or autumn cuttings with 0%, 0.4%, and 0.8% IBA solution before rooting in non-mist propagator. Notched seeds soaked in water for 48 h showed the fastest seed germination with the highest germination percentages (73.3) and better seedling growth in terms of plant height, collar diameter, leaf number and total dry mass followed by notched seeds soaked in water for 72 h. The slowest germination and the lowest germination percentage (3.3), as well as the poorest growth performance was for intact seeds without any treatment. The highest rooting percent- age with maximum number of roots (36.6) was obtained from the summer cuttings treated with 0.4% IBA solution followed by autumn cuttings with 0.8% IBA and the lowest (43.3% and 8.3 roots) was for summer cuttings in control. The factors also dictated the survival and growth performance of rooted cuttings in the nursery conditions. The outcomes of these trials i.e., notched seeds soaking in water for 48 h will help to enhance the propagation of this valuable medicinal plant species.
    Źródło:
    Dendrobiology; 2021, 85; 92-104
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of non-linear shock absorbers-boundary value problem analysis
    Autorzy:
    Rahman, M. A.
    Ahmed, U.
    Uddin, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/265424.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    amortyzator
    tłumik drgań
    stabilność
    wartość graniczna
    shock absorber
    untuned vibration damper
    frequency ratios
    non-linear springs
    non-linear dampers
    stability
    boundary value problem
    multisegment method of integration
    Opis:
    A nonlinear boundary value problem of two degrees-of-freedom (DOF) untuned vibration damper systems using nonlinear springs and dampers has been numerically studied. As far as untuned damper is concerned, sixteen different combinations of linear and nonlinear springs and dampers have been comprehensively analyzed taking into account transient terms. For different cases, a comparative study is made for response versus time for different spring and damper types at three important frequency ratios: one at r = 1, one at r > 1 and one at r <1. The response of the system is changed because of the spring and damper nonlinearities; the change is different for different cases. Accordingly, an initially stable absorber may become unstable with time and vice versa. The analysis also shows that higher nonlinearity terms make the system more unstable. Numerical simulation includes transient vibrations. Although problems are much more complicated compared to those for a tuned absorber, a comparison of the results generated by the present numerical scheme with the exact one shows quite a reasonable agreement.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 793-814
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing the impact of the compliance rate and daytime running lights penetration on the safety effectiveness of regulatory headlight use signs
    Autorzy:
    Ahmed, M. M.
    Gaweesh, S.
    Ksaibati, K.
    Rahman, M. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2140903.pdf
    Data publikacji:
    2018
    Wydawca:
    Fundacja Centrum Badań Socjologicznych
    Tematy:
    Daytime Running Lights
    safety
    headlight signs
    safety effectiveness
    Opis:
    While Daytime Running Lights (DRLs) are proven to increase vehicle conspicuity during various times of the day, their safety effectiveness is still debatable. This study utilized various statistical techniques and a field study to assess the impact of the compliance rate, and the penetration of the Daytime Running Lights (DRLs) technology on the safety efficacy of regulatory headlight use signs. Daytime head-on and opposite sideswipe multivehicle crashes for Daytime Running Lights and non-DRLs equipped passenger vehicles on mountainous rural two-way highway sections with and without regulatory headlight use signs were examined in a matched case control design. Preliminary analysis showed that only 23% of vehicles involved in crashes on the study sections were equipped with DRLs. Although results from the odds ratios and ratios of odds ratios indicated some safety benefits of the headlight use signs, the safety benefits were statistically insignificant. The study concluded that the low compliance rate of 12% affected the safety effectiveness of the regulatory headlight signs. Transportation agencies should have different considerations when evaluating the safety effectiveness of compliance-and behavioral-based countermeasures.
    Źródło:
    Journal of Sustainable Development of Transport and Logistics; 2018, 3, 1; 6-21
    2520-2979
    Pojawia się w:
    Journal of Sustainable Development of Transport and Logistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lie group analysis of heat flux effect on MHD second slip flow for a slightly rarefied gas past a stretching sheet with heat generation
    Autorzy:
    Megahed, Ahmed M.
    Abdel-Rahman, Reda G.
    Powiązania:
    https://bibliotekanauki.pl/articles/297800.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    Lie group analysis
    second order slip
    slightly rarefied gas
    MHD
    heat flux
    Opis:
    The present paper discusses steady MHD second order slip flow and heat transfer for a slightly rarefied gas due to an impermeable stretching sheet with heat flux and internal heat generation. By using the Lie group analysis, new similarity transformations are obtained. Employing these transformations, allows the partial differential equations governing the problem to transform into a system of ordinary differential equations which are later treated numerically using shooting method. Effects of the governing parameters on the dimensionless velocity and dimensionless temperature profiles are outlined graphically. Furthermore, results for the local skin-friction coefficient and the local Nusselt number are presented for some different values of the governing parameters in a tabular form. Also, results show that there is a strong dependency of the dimensionless temperature on the heat flux.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(1); 45-59
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electroluminescence Enhancement of Polymer Light Emitting Diodes Through Surface Plasmons by Ag Nanoplates
    Autorzy:
    Aziz, T.
    Salleh, M.
    Bakar, N.
    Umar, A.
    Rahman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186484.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    Opis:
    This paper reports a study on the surface plasmon effect of Ag nanoplates on electroluminescent property of polymer light emitting diodes. The diode is a single layer light emitting device made of poly [9,9-di-(2-ethylhexyl)-fluorenyl-2,7-diyl] (PEHF). 5 wt.% of Ag nanoplates were incorporated into the PEHF layer. The results showed that the electroluminescence intensity of the diodes is increased by 51.85%, compared with the device without the Ag nanoplates. The enhancement is due to the coupling process between the Ag surface plasmon with the emission light from the PEHF. The occurrence of the coupling process was proved firstly based on the fact that the exciton lifetime of the PEHF:Ag layer is shorter than that without Ag, as measured by time-resolved photoluminescence spectroscopy. Secondly, the PEHF photoluminescence peak at 425 nm is overlaping with the surface plasmon absorption peak of Ag nanoplates.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 711-713
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Characterization of Vanadium/Vanadium Pentoxide/Vanadium (V/V₂O₅/V) Tunnel Junction Diodes
    Autorzy:
    Zia, M.
    Abdel-Rahman, M.
    Al-Khalli, N.
    Debbar, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401362.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.Kk
    Opis:
    A metal/insulator/metal (MIM) diode is a structure in which a thin oxide layer is sandwiched between two metal layers. Metal/insulator/metal (MIM) diodes coupled to antennas have been widely investigated as detectors for millimeter wave and infrared radiation for imaging and spectroscopic applications. In this work, we report on the fabrication and characterization of MIM tunnel junction diodes by using a new material combination, vanadium-vanadium pentoxide-vanadium (V/V₂O₅/V), with contact areas of 2× 2 μm². The V/V₂O₅/V MIM was fabricated using electron-beam lithography, sputter deposition and conventional liftoff methods. The fabricated V/V₂O₅/V MIM diodes showed a maximum absolute sensitivity of 2.35 $V^{-1}$. In addition, noise spectra for the fabricated MIM diodes were measured and analyzed.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1289-1291
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction and adhesion energy of polymer–polymer sliding combinations
    Tarcie i energia adhezji podczas ślizgania w połączeniach polimer–polimer
    Autorzy:
    Marzouk, W. W.
    Abdel-Rahman, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/188045.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    friction coefficient
    reversible adhesion energy
    hardness ratio
    polymer–polymer pairs
    współczynnik tarcia
    energia adhezji
    wskaźnik twardości
    połączenie polimer–polimer
    Opis:
    The friction coefficient, reversible adhesion energy and hardness ratio of polymer-polymer combinations such as PC, PS, PTFE, PA6, LDPE and PP are examined using a pin-on-ring type tribometer. Polycarbonate has been used as a ring material. The applied loads are 10, 20, 30, 40, and 50 N. The coefficient of friction as a function of sliding time, applied load, and hardness ratio has been observed. Additionally, the relationship between the coefficient of friction and reversible adhesion energy calculated from the surface components is calculated. The results show that the coefficient of friction is highly dependent on the reversible energy. The coefficient of friction increases as the reversible adhesion energy increases. At a hardness ratio equal to unity, the coefficient of friction exhibits high values. At higher values of the hardness ratio, HC/Hp = 2.4, however, the coefficient of friction possesses low values. In addition, the coefficient of friction is highly dependent on the load applied. It decreases with the increase in the load.
    W pracy przedstawiono wyniki badań współczynnika tarcia, odwracalnej energii adhezji i stosunku twardości połączeń polimer-polimer, takich jak PC, PS, PTFE, PA6, LDPE i PP, które określano przy użyciu testera typu trzpień–pierścień. Na materiał pierścienia wykorzystano poliwęglan. Zastosowano obciążenia 10, 20, 30, 40 i 50N. Obserwowano zmianę współczynnika tarcia w funkcji czasu ślizgania, przyłożonego obciążenia i wskaźnika twardości. Ponadto obliczano zależność pomiędzy współczynnikiem tarcia i odwracalną energią adhezji. Wyniki pokazują, że współczynnik tarcia jest bardzo zależny od energii adhezji. Współczynnik tarcia wzrasta wraz ze wzrostem energii adhezji. Przy jednakowej twardości materiałów współczynnik tarcia przyjmuje wysokie wartości. Przy wyższych wartościach wskaźnika twardości, HC/Hp = 2.4, współczynnik tarcia ma małą wartość. Dodatkowo, współczynnik tarcia bardzo zależy od przyłożonego obciążenia – jego wartość maleje wraz ze wzrostem obciążenia.
    Źródło:
    Tribologia; 2012, 5; 97-106
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EDTA reduces cadmium toxicity in mustard (Brassica juncea L.) by enhancing metal chelation, antioxidant defense and glyoxalase systems
    EDTA obniża toksyczność kadmu w gorczycy sarepskiej (Brassica juncea L.) poprzez zwiększenie chelatowania metalu oraz poprawę działania systemu antyoksydacyjnego i glioksalazowego
    Autorzy:
    Al Mahmud, J.
    Hasanuzzaman, M.
    Nahar, K.
    Rahman, A.
    Fujita, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27056.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    To investigate the possible role of EDTA in mitigating cadmium (Cd) toxicity, we treated mustard (Brassica juncea L.) seedlings with CdCl2 (0.5 mM and 1.0 mM, 3 days) alone and in combination with 0.5 mM EDTA in a semihydroponic medium. In the absence of EDTA, mustard seedlings accumulated Cd in their roots and shoots in a concentration dependent manner. Overaccumulation of Cd boosted generation of hydrogen peroxide (H2O2) and superoxide anions (O2•−), increased lipoxygenase (LOX) activity, lipid peroxidation, and cytotoxic methylglyoxal (MG) content. It also disturbed components of the antioxidant defense and glyoxalase systems. Furthermore, Cd stress decreased growth, leaf relative water content (RWC) and chlorophyll (chl) content but augmented the proline (Pro) content. On the other hand, EDTA supplemented Cd-stressed seedlings improved the constituents of the AsA-GSH cycle with the upregulated activities of ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR), glutathione peroxidase (GPX), superoxide dismutase (SOD), and catalase (CAT). Moreover, addition of EDTA to the Cd-stressed seedlings notably enhanced Gly I activity in contrast to the stress treatment. Ethylenediaminetetraacetic acid decreased Cd accumulation in the both shoots and roots, as well as increased other nonprotein thiols (NPTs) in leaves, including the phytochelatin (PC) content. It also decreased H2O2 and O2•− generation, lipid peroxidation and MG content but enhanced RWC, chl and Pro contents in the leaves, which confirmed the improved growth of seedlings. The findings of the study suggest that exogenous application of EDTA to the Cd-treated seedlings reduces Cd-induced oxidative injuries by restricting Cd uptake, increasing NPTs concentration and upregulating most of the components of their antioxidant defense and glyoxalase systems.
    W celu określenia roli EDTA (kwas edetynowy, acidum edeticum) w obniżaniu toksyczności kadmu (Cd), siewki gorczycy (Brassica juncea L.) traktowano CdCl2 (w stężeniach 0,5 i 1 mM przez 3 dni) w kombinacjach z lub bez dodatku 0,5 mM EDTA do semi-hydroponicznego podłoża. Rośliny uprawiane w obecności Cd bez EDTA akumulowały metal w korzeniach i częściach nadziemnych proporcjonalnie do zastosowanego stężenia Cd. Akumulacja Cd indukowała produkcję nadtlenku wodoru (H2O2) i anionu ponadtlenkowego (O2•−), zwiększała aktywność lipoksygenazy (LOX), peroksydację lipidów i poziom cytotoksycznego metyloglioksalu (MG). Kadm zakłócał również funkcjonowanie składników systemu antyoksydacyjnego i glioksalazowego. Ponadto, Cd negatywnie wpływał na wzrost roślin, względną zawartość wody w liściach (RWC) i stężenie chlorofilu, ale stymulował akumulację proliny (Pro). Dodatek EDTA do pożywki zawierającej Cd pozytywnie wpływał na funkcjonowanie cyklu glutationowo-askorbinianowego, zwiększając aktywność peroksydazy askorbinianowej (APX), reduktazy monodehydroaskorbinianowej (MDHAR), reduktazy dehydroaskorbinianowej (DHAR), reduktazy glutationowej (GR), peroksydazy glutationowej (GPX), a także dysmutazy ponadtlenkowej (SOD) i katalazy (CAT). Ponadto, dodanie EDTA do środowiska wzrostu roślin traktowanych Cd zwiększyło aktywność glioksalazy I (Gly I) w roślinach, czego nie stwierdzono w roślinach traktowanych wyłącznie Cd. EDTA ograniczył akumulację Cd zarówno w korzeniach, jak i w częściach nadziemnych, zwiększając jednocześnie poziom niebiałkowych tioli (NPT), w tym fitochelatyn (PC). Dodatkowo, w roślinach traktowanych Cd w obecności EDTA stwierdzono niższy poziom H2O2, O2•− i MG oraz obniżenie peroksydacji lipidów, ale wzrost RWC, a także stężenia chlorofilu i Pro, co wpłynęło na lepszy wzrost roślin. Uzyskane wyniki sugerują, że zastosowanie egzogennego EDTA razem z Cd obniża toksyczność metalu związaną z generowaniem stresu oksydacyjnego, poprzez ograniczenie pobierania Cd, zwiększenie stężenia NPT i pozytywny wpływ na aktywność większości składników systemu antyoksydacyjnego i glioksalazowego.
    Źródło:
    Acta Agrobotanica; 2019, 72, 2
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors Affecting the Performance of Double Chamber Microbial Fuel Cell for Simultaneous Wastewater Treatment and Power Generation
    Autorzy:
    Khan, M.R.
    Amin, M.S.A.
    Rahman, M.T.
    Akbar, F.
    Ferdaus, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/779340.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    catholyte
    COD
    Microbial Fuel Cell
    wastewater treatment
    Opis:
    Electricity generation from the readily biodegradable organic substrate (glucose) accompanied by decolorization of azo dye was investigated using a two-chamber microbial fuel cell (MFC). Batch experiments were conducted to study the effect of dye and substrate concentration on MFC performance. Electricity generation was not signifi cantly affected by the azo dye at 300 mg/L, while higher concentrations inhibited electricity generation. The chemical oxygen demand (COD) removal and decolorization of dye containing wastewater used in the MFC were studied at optimum operation conditions in anode and cathode, 57% COD removal and 70% dye removal were achieved. This study also demonstrated the effect of different catholyte solutions, such as KMnO4 and K2Cr2O7 on electricity generation. As a result, KMnO4 solution showed the maximum electricity generation due to its higher standard reduction potential.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 1; 7-11
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative growth kinetic study of Newcastle disease virus, infectious bursal disease virus and avian influenza virus in chicken embryo fibroblast and DF-1 cell lines
    Autorzy:
    Anam, S.
    Rahman, S.U.
    Ali, S.
    Saeed, M.
    Goyal, S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087170.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cytopathic effect
    titer
    growth kinetic
    vaccine production
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 2; 287-292
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a nanoswitch in 130 nm CMOS technology for 2.4 GHz wireless terminals
    Autorzy:
    Bhuiyan, M. A.
    Reaz, M. B. I.
    Jalil, J.
    Rahman, L. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/200508.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CMOS
    ISM band
    nanometer
    transceivers
    T/R switch
    wireless
    Opis:
    This paper proposes a transmit/receive (T/R) nanoswitch in 130 nm CMOS technology for 2.4 GHz ISM band transceivers. It exhibits 1.03-dB insertion loss, 27.57-dB isolation and a power handling capacity (P1 dB) of 36.2-dBm. It dissipates only 6.87 μW power for 1.8/0 V control voltages and is capable of switching in 416.61 ps. Besides insertion loss and isolation of the nanoswitch is found to vary by 0.1 dB and 0.9 dB, respectively for a temperature change of 125°C. Only the transistor W/L optimization and resistive body floating technique is used for such lucrative performances. Besides absence of bulky inductors and capacitors in the schematic circuit help to attain the smallest chip area of 0.0071 mm2 which is the lowest ever reported in this frequency band. Therefore, simplicity and low chip area of the circuit trim down the cost of fabrication without compromising the performance issue.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 399-406
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stack Parameters Effect on the Performance of Anharmonic Resonator Thermoacoustic Heat Engine
    Wpływ parametrów stosu na osiągi anaharmonicznego rezonatora termo akustycznej maszyny cieplnej
    Autorzy:
    Nouh, M. A
    Arafa, N
    Abdel-Rahman, E
    Powiązania:
    https://bibliotekanauki.pl/articles/140035.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoacoustic
    stack
    anharmonic
    resonator
    engine
    optimization
    termoakustyka
    stos
    silnik
    rezonator
    Opis:
    A thermoacoustic heat engine (TAHE) converts heat into acoustic power with no moving parts. It exhibits several advantages over traditional engines, such as simple design, stable functionality, and environment-friendly working gas. In order to further improve the performance of TAHE, stack parameters need to be optimized. Stack’s position, length and plate spacing are the three main parameters that have been investigated in this study. Stack’s position dictates both the efficiency and the maximum produced acoustic power of the heat engine. Positioning the stack closer to the pressure anti-node might ensure high efficiency on the expense of the maximum produced acoustic power. It is noticed that the TAHE efficiency can further be improved by spacing the plates of the stack at a value of 2.4 of the thermal penetration depth, ςk . Changes in the stack length will not affect the efficiency much as long as the temperature gradient across the stack, as a ratio of the critical temperature gradient Γ, is more than 1. Upon interpreting the effect of these variations, attempts are made towards reaching the engine’s most powerful operating point.
    Termoakustyczna maszyna cieplna (TAHE) przekształca ciepło w energie akustyczna bez użycia części ruchomych. W porównaniu z maszynami tradycyjnymi ma ona szereg zalet, takich jak prosta konstrukcja, stabilność działania oraz wykorzystanie gazów przyjaznych dla środowiska. W celu dalszej poprawy osiągów maszyny TAHE należy zoptymalizować parametry stosu (zespołu wąskich kanałów miedzy płytami wymiennika ciepła). Trzema głównymi parametrami analizowanymi w przedstawionej pracy są pozycja stosu, długości, odstęp między płytami. Pozycja stosu decyduje zarówno o sprawności jak maksymalnej mocy akustycznej wytwarzanej przez maszynę cieplną. Umieszczenie stosu bliżej strzałki fali stojącej może zapewnić większą sprawność kosztem maksymalnej wytwarzanej mocy akustycznej. Stwierdzono, że dalsza poprawa sprawności maszyny TAHE może być osiągnięta gdy zastosuje się odstęp płyt stosu równy 2,4 cieplnej głębokości wnikania, k . Zmiany długości stosu nie maja wielkiego wpływu na sprawność tak długo, jak stosunek krytycznego gradientu cieplnego jest większy od 1. Na podstawie interpretacji efektów tych zmian podjęto wysiłki dla uzyskania najlepszych osiągów maszyny.
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 1; 115-127
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A data mining approach to improve military demand forecasting
    Autorzy:
    Thiagarajan, R.
    Rahman, M.
    Gossink, N.
    Calbert, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/91684.pdf
    Data publikacji:
    2014
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    critical stocks
    demand
    forecasting
    military operation
    military planning
    military supplies
    autocorrelated
    cross-correlated
    data mining
    Opis:
    Accurately forecasting the demand of critical stocks is a vital step in the planning of a military operation. Demand prediction techniques, particularly autocorrelated models, have been adopted in the military planning process because a large number of stocks in the military inventory do not have consumption and usage rates per platform (e.g., ship). However, if an impending military operation is (significantly) different from prior campaigns then these prediction models may under or over estimate the demand of critical stocks leading to undesired operational impacts. To address this, we propose an approach to improve the accuracy of demand predictions by combining autocorrelated predictions with cross-correlated demands of items having known per-platform usage rates. We adopt a data mining approach using sequence rule mining to automatically determine crosscorrelated demands by assessing frequently co-occurring usage patterns. Our experiments using a military operational planning system indicate a considerable reduction in the prediction errors across several categories of military supplies.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 3; 205-214
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fruit yield and quality of ‘Florida King’ peaches subjected to foliar calcium chloride sprays at different growth stages
    Autorzy:
    Shahid, M.O.
    Muhmood, A.
    Ihtisham, M.
    Rahman, M.ur
    Amjad, M.
    Sajid, M.
    Riaz, K.
    Ali, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/12704034.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Peach fruit and trees are prone to various issues, regarding yield, quality and pest attack. Calcium plays several roles in plant and fruit development. Therefore the current study was conducted to evaluate the response of peach fruit to foliar application. The experiment was laid out in Randomized Complete Block Design with two factors factorial arrangement and three replicates. Calcium chloride was applied at the rate of 0, 1, 2 and 3%. The foliar application of calcium was done at pink bud stage, berry size fruit stage, and then at pit hardening stage of peach. The obtained results indicated that foliar application of calcium significantly improved peach fruit quality and yield. The highest fruit weight (142.6 g), yield tree⁻¹ (15.6 kg), ascorbic acid content (6.67 mg∙100 g⁻¹), total soluble solids (11.0°Bx), fruit juice pH (3.98), sugar to acid ratio (45.1), fruit firmness (3.90 kg∙cm⁻²) and fruit volume (155.6 cm³) was obtained with the application of 3% solution of calcium chloride at pit hardening stage but it significantly reduced the percent titratable acidity (0.3%) and disease incidence (5.8%). It was concluded that 3% calcium chloride applied at the pit hardening stage significantly boosted peach quality and fruit yield.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 1; 131-139
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Capital asset pricing model in market overreaction conditions : evidence from Indonesia Stock Exchange
    Model wyceny aktywów kapitałowych w warunkach nadmiernej reakcji rynku : przypadek giełdy papierów wartościowych w Indonezji
    Autorzy:
    Sembiring, F. M.
    Rahman, S.
    Effendi, N.
    Sudarsono, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/405200.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    beta
    CAPM
    contrarian strategy
    market overreaction
    returns reversal
    przeciwstawna strategia
    nadmierna reakcja rynku
    zmiana zwrotu
    Opis:
    Market overreaction is a phenomenon in stock markets characterized by a return reversal on the stocks which resulted winners into a losers, vice versa, losers into a winners. While the CAPM is the model of asset pricing which puts the market risk factor as the sole determinant of return. The purpose of this study is testing whether market overreaction occurred in Indonesia stock market and whether Capital Asset Pricing Model (CAPM) can explain the portfolio return of the winners and the losers. This study uses the stocks of non-financial sector companies in Indonesia Stock Exchange during the period July 2005-December 2015. Abnormal returns for each stock obtained by using a market model and the portfolio formed by using the method of 6-6 observation period. The results of this study are: (1) Market overreaction occurs in the Indonesia stock market characterized by a return reversal of the winners and the losers, and (2) CAPM which only considers the market risk factors in the model tend to be able to explain the portfolio return.
    Nadmierna reakcja rynku jest zjawiskiem spotykanym na giełdach papierów wartościowych cechujących się zmianą sytuacji rynkowej papierów wartościowych, co czyni ze zwycięzców przegranych i odwrotnie, z przegranych zwycięzców. Model Wyceny Aktywów Kapitałowych (ang. CAPM) jest modelem wyceny aktywów, który stawia czynnik ryzyka rynkowego jako jedyny wyznacznik zwrotu. Celem tego badania jest przetestowanie, nadmiernej reakcji rynku, która wystąpiła na indonezyjskiej giełdzie papierów wartościowych oraz określenie, czy model wyceny aktywów kapitałowych (CAPM) może wyjaśnić zwrot portfela zwycięzców i przegranych. Niniejsze badanie wykorzystuje akcje spółek sektora niefinansowego na giełdzie papierów wartościowych w Indonezji w okresie od lipca 2005 do grudnia 2015. Nieprawidłowe zwroty od każdego papieru wartościowego uzyskano za pomocą modelu rynku i portfela wykonanego przez użycie metody 6-6 okresu obserwacji. Wyniki tego badania są następujące: (1) nadmierna reakcja rynku pojawiająca się na giełdzie w Indonezji charakteryzuje się odwróceniem zwrotu zwycięzców i przegranych, oraz (2) model CAPM, który uznaje tylko czynniki ryzyka rynkowego ma tendencję do wyjaśnienia zwrotu portfela.
    Źródło:
    Polish Journal of Management Studies; 2016, 14, 2; 182-191
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Optimization of Microbolometer Multilayer Optical Cavity
    Autorzy:
    Awad, E.
    Al-Khalli, N.
    Abdel-Rahman, M.
    Debbar, N.
    Alduraibi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401364.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.60.Bt
    42.25.Bs
    Opis:
    Microbolometers are the most widely used detectors in long-wave infrared uncooled thermal imagers. An optical cavity is required within a microbolometer structure to increase its optical absorption. In this work we present a detailed study on the design and optimization of a microbolometer optical cavity using Essential-Macleod package. In the simulations, the cavity is considered as thin film multi-layers that form cascaded Fabry-Perot optical cavities. In the design phase, the structures of layers are selected, which includes selection of materials and initial thickness. The absorbing layers are chosen to be made of vanadium-pentoxide (V₂O₅) and titanium (Ti). In the optimization phase, the designed layer thicknesses are varied to maximize optical absorption within the absorbing layers. The simulations show that Ti layer absorption dominates over the V₂O₅ layer. Also, the optimization proves that the thickness of cavity's air-gap is not equal simply to quarter-wavelength, because of the presence of a complex cascaded Fabry-Perot structure. The optimized air-gap thickness is found to be ≈ 3.5 μm at wavelength of 10.6 μm.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1295-1297
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dosimetry of 131 I for Occupational Radiation Workers by Whole Body Counting System
    Autorzy:
    Rahman, M. S.
    Haydar, M. A.
    Patwary, M. K. A.
    Shome, S. M.
    Paul, S.
    Paul, D.
    Meaze, A. K. M. M. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/411910.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Internal Dosimetry
    Whole Body Counter
    IMBA
    131I
    Opis:
    Internal radiation dosimetry of occupational radiation workers due to inhalation of 131 I during maintenance at iodine 131 I hot cell of Radioisotope Production Division (RIPD) of Bangladesh Atomic Energy Commission have been performed with Whole Body Counter (WBC) containing two large size NaI detector. The contaminated radioactivity of the radiation workers by 131 I was immediately conducted using a WBC (CANBERRA, FASTSCAN model 2250) and counting was repeated again a few days later. The performance of whole body counter was checked by CANBERRA transfer phantom (model 2257) with a mixed source (20 ml vial). The intake was calculated by Apex-Invivo counting software and then corresponding dose in thyroid were estimated by using Integrated Modules for Bioassay Analysis (IMBA) Professional Plus code modules. The body activity due to intake of 131 I and the total effective and equivalent dose in thyroid were also estimated and discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 21-27
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    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:
    Towards the propagation of a critically endangered tree species Anisoptera scaphula
    Autorzy:
    Hossain, M.A.
    Ferdous, J.
    Rahman, M.A.
    Azad, M.A.K.
    Shukor, N.A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/41522.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    propagation
    endangered species
    tree
    Anisoptera scaphula
    Dipterocarpaceae
    seed
    sowing position
    germination percentage
    rooting ability
    Opis:
    Anisoptera scaphula (Roxb.) Kurz, the tallest tree species in Bangladesh, is critically endangered worldwide due to its poor natural regeneration. This study describes the appropriate regeneration technique for A. scaphula through seed germination and clonal propagation by stem cutting. The fastest and highest germination percentage (65) was observed in dewinged seeds sown inverted orientation with half buried position (T10) followed by dewinged seeds (62.5%) sown horizontally in full buried (T7) and delayed germination with lowest percentage (15) was in control (T0). Optimum initial growth was also shown when seedlings were developed from the seeds under T7. Both winged and dewinged seeds sown vertically in full buried or half buried position produced curved seedlings. However, dewinged seeds sown in horizontal or inverted (winged side down) position produced otherwise i.e., straight seedlings. The highest rooting percentages (63%) and maximum number of root (4.8) per cutting were obtained when one node cuttings treated with 0.8% IBA solution followed by 0.4% IBA in turn affecting for better survival and growth of rooted cuttings in the nursery conditions.
    Źródło:
    Dendrobiology; 2014, 71
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of~Rf Plasma Nitrided Silicon Thin Films at Different Rf Plasma Processing Powers
    Autorzy:
    Mohamed, S.
    Raaif, M.
    Abd El-Rahman, A.
    Shaaban, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493713.pdf
    Data publikacji:
    2011-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Dj
    61.05.cp
    73.61.-r
    78.66.-w
    Opis:
    Nitrided surfaces and composition gradients in thin films exhibit interesting mechanical, electrical and optical properties. Therefore, silicon (Si) thin films were prepared by electron beam evaporation and nitrided by an inductively coupled rf plasma. The effects of successive plasma processing power on structural and optical properties as well as electrical resistivity were examined by different characterization techniques. The Si thin films were transformed gradually into nitrides compound thin films and the amount of nitrogen in the film increased with increasing the rf processing power. The Si nitrided films showed structural, optical and electrical properties that depend on the nitriding power. Increasing the rf plasma processing power caused amorphization, reduced the thickness, increased transmittance, increased resistivity and decreased the reflectance of the Si films. The electrical resistivity increased about eight orders of magnitude when the sample nitrided at 500 W. Different optical band gap were determined indicating the presence of different competing phases in the same film. The decrease in refractive index with plasma treatment power is attributed to the possible change in the bucking density as well as to the increase in the band gap.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 3; 552-557
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chitosan biopolymer improves the fruit quality of litchi (Litchi chinensis Sonn.)
    Biopolimer chitozan poprawia jakość owoców liczi (Litchi chinensis Sonn.)
    Autorzy:
    Mehebub, Md.S.
    Mahmud, N.U.
    Rahman, M.
    Surovy, M.Z.
    Gupta, D.R.
    Hasanuzzaman, M.
    Islam, M.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/26717.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    Chitosan (CHT) is a natural compound that has been used to control postharvest pathogenic diseases due to its capability of eliciting natural defense responses in plants. The aim of this study was to investigate the effect of foliar CHT application on yield and quality of the litchi fruit. Chitosan was applied by spraying on to fruit and foliage just after fruit set four times at 7-day intervals with four varying doses viz. 100, 250, 500, and 1,000 µg L−1 and a control (0 µg L−1). Although the application of CHT had no significant effect on the size of the fruits (length and width), the total contents of phenolics, flavonoids, and ascorbic acid and the antioxidant activity of litchi fruit arils were significantly increased in CHT-treated fruit compared with the untreated control. The highest phenolic, flavonoid, and ascorbic acid contents were 334 µg gallic acid g−1, 881 μg quercetin g−1, and 178 µg g−1, respectively, in fruits treated with 500 µg L−1 CHT. However, the highest antioxidant activity (622 μg butylated hydroxytoluene g−1) was recorded in 250 µg L−1 CHT-treated fruits. Our findings revealed that the application of low doses of CHT in a litchi orchard might improve fruit quality by increasing the content of antioxidants and antioxidant activities.
    Chitozan (CHT) jest naturalnym związkiem wykorzystywanym do zwalczania chorób roślin, ponieważ wykazuje potencjał do wywoływania naturalnej odpowiedzi obronnej w roślinach. Celem niniejszych badań było określenie wpływu dolistnego aplikowania CHT na plonowanie i jakość owoców liczi. Chitozan w stężeniu: 0 (kontrola), 100, 250, 500 lub 1000 μg L−1 rozpylano na owoce i liście bezpośrednio po pojawieniu się owoców czterokrotnie w odstępach 7-dnio-wych. Mimo, że aplikacja CHT nie miała istotnego wpływu na wielkość owoców (długość i szerokość), całkowita zawartość związków fenolowych, flawonoidów i kwasu askorbiowego, jak również aktywność antyoksydacyjna owoców liczi wyraźnie wzrosła po zastosowaniu CHT w porównaniu do owoców nie poddanych działaniu tego związku. Najwyższe stężenia związków fenolowych, flawonoidów i kwasu askorbinowego, wynoszące odpowiednio: ekwiwalent 334 μg kwasu galusowego g−1 , ekwiwalent 881 μg kwercytyny g−1 i 178 μg g−1, stwierdzono w owocach traktowanych 500 μg L−1 CHT. Jednak najwyższą aktywność antyrodnikową (622 μg butylohy-droksytoluenu g−1) stwierdzono w owocach traktowanych 250 μg L−1 CHT. Uzyskane wyniki wskazują, że zastosowanie niskich stężeń CHT w sadach liczi może poprawić jakość owoców poprzez zwiększenie w nich zawartości antyoksydantów oraz aktywności antyrodnikowej.
    Źródło:
    Acta Agrobotanica; 2019, 72, 2
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of radioactive impact of the gas well accident on environment of Sylhet division in Bangladesh
    Autorzy:
    Chakraborty, S. R.
    Saha, K. K.
    Rahman, A. K. M. R.
    Kamal, M.
    Chowdhury, M. I.
    Alam, Md. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/411611.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Natural gas well accident
    Environmental radioactivity
    Public exposure etc
    Opis:
    The main goal of this study is to carry out the public exposure contribution from radioactive materials occurring due to the accident of natural gas exploration well of Sylhet division in Bangladesh. This study has been performed by using a gamma spectrometry of Genie 2000 software embedded PC-based High Purity Germanium (HPGe) detector system. The measured activity concentrations of naturally occurring radionuclides 232Th, 226Ra, and 40K have been in the public safety limit on the environment of the study areas. The specific activity of detected anthropogenic radionuclide 137Cs has been found to be very little with a mean value of 1.65 ± 0.61 and 1.13 ± 0.57 Bq•kg–1 in the Magurchhera and Haripur gas field area respectively.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 9, 1; 48-60
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microbial degradation of lignocellulosic biomass: discovery of novel natural lignocellulolytic bacteria
    Autorzy:
    Ahmed, S.
    Rahman, S.
    Hasan, M.
    Paul, N.
    Sajib, A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/81125.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lignocellulose
    microbial degradation
    biofuel
    cellulose
    lignin
    hemicellulose
    lignocellulolytic bacteria
    Chryseobacterium gleum
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chitosan biostimulant controls infection of cucumber by Phytophthora capsici through suppression of asexual reproduction of the pathogen
    Biostymulant chitozan kontroluje zakażenie ogórka przez Phytophthora capsici poprzez hamowanie bezpłciowego rozmnażania patogen
    Autorzy:
    Zohara, F.
    Surovy, M.Z.
    Khatun, A.
    Prince, F.R.K.
    Ankada, A.M.
    Rahman, M.
    Islam, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/27828.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    The biopolymer chitosan is a derivative of chitin, which can promote plant growth and protect plants from phytopathogens. This study aimed to evaluate the efficacy of chitosan as a biostimulant and a biorational agent to protect cucumber plants from damping-off disease caused by Phytophthora capsici. Cucumber seeds were treated with a range of chitosan concentrations, viz. 0, 125, 250, and 500 ppm, to evaluate effect on seed germination and fresh root and shoot weight of the seedlings. Chitosan significantly (p ≤ 0.05) enhanced seed germination and root and shoot growth of cucumber in a dose-dependent manner up to 500 ppm. Application of in vitro chitosan suspension onto P. capsici mycelial plug suppressed growth of mycelia, formation of sporangia, and release of P. capsici zoospores at 125–500 ppm concentrations. Cucumber seedlings from chitosan-treated seeds showed enhanced resistance to damping-off disease caused by P. capsici compared to untreated control. Cucumber seedlings from 500 ppm chitosan seed treatment showed 100% disease resistance against damping off caused by P. capsici. These results suggest that chitosan could be used as a natural and environmentally safe alternative to a synthetic growth promoter and pesticide for sustainable production of cucumber.
    Biopolimer chitozan jest pochodną chityny, może on stymulować wzrost roślin i chronić je przed fitopatogenami. Celem badań była ocena skuteczności chitozanu jako biostymulatora i „bioracjo-nalnego” środka ochrony ogórka przed zgorzelą wywołaną przez Phytophthora capsici. Nasiona ogórka poddano działaniu różnych stężeń chitozanu tj. 0, 125, 250 i 500 ppm w celu oceny ich wpływu na kiełkowanie nasion oraz świeżą masę korzeni i pędów siewek. Chitozan istotnie (p ≤ 0,05) stymulował kiełkowanie nasion oraz wzrost korzeni i pędów ogórka w sposób zależny od dawki do 500 ppm. Zastosowanie zawiesiny chitozanu w zakresie stężeń 125–500 ppm w warunkach in vitro hamowało wzrost grzybni P. capsici, tworzenie sporangiów i uwalnianie zoospor P. capsici. Siewki roślin uzyskanych z nasion traktowanych chitozanem charakteryzowały się zwiększoną odpornością na zgorzel wywołaną przez P. capsici w porównaniu z nietraktowanych chitozanem. Siewki ogórków z nasion traktowanych 500 ppm chitozanu wykazywały 100% odporność na zgorzel powodowaną przez P. capsici. Wyniki te sugerują, że chitozan może być stosowany jako naturalna i bezpieczna dla środowiska alternatywa dla syntetycznych stymulatorów wzrostu oraz pestycydów w zrównoważonej produkcji ogórka.
    Źródło:
    Acta Agrobotanica; 2019, 72, 1
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing Dry Ultrafine Grinding of Talc in Attritor Mill
    Optymalizacja ultradrobnego mielenia talku na sucho w młynie Attritor
    Autorzy:
    El-Mofty, Salah E.
    Elbendari, A. M.
    El-Midany, A. A.
    Abdel-Rahman, M. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/27323304.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    dry grinding
    ultra-fine grinding
    attritor mill
    statistical design
    talc
    mielenie na sucho
    mielenie ultradrobne
    młyn attritor
    projektowanie statystyczne
    talk
    Opis:
    In this work, the parameters affecting the dry grinding of talc in the attritor mill were investigated. The attritor was tested with its initial design without balls then with balls as additional grinding media to prepare a feed passing 45 microns. The prepared feed (-45 mm) was used to produce a product with 10 μm or less using statistical design in presence of balls. The presence of balls enhances product fineness. The significance of the studied factors is: stirrer speed>mill filling >grinding time. In addition, the d50 was correlated with studied factors. The mean particle size (d50) as low as 6 μm was obtained at 460 rpm, 20% mill filling, and after 60 min grinding time.
    W niniejszej pracy zbadano parametry wpływające na mielenie talku na sucho w młynie Attritor. Attritor został przetestowany w początkowej wersji bez kulek, a następnie z kulkami jako dodatkowym medium mielącym w celu przygotowania nadawy przechodzącej przez 45 mikronów. Przygotowany wsad (-45 mm) został wykorzystany do wytworzenia produktu o uziarnieniu 10 μm lub mniejszym przy użyciu statystycznego projektu w obecności kulek. Obecność kulek zwiększa stopień rozdrobnienia produktu. Znaczenie badanych czynników to: prędkość mieszadła > wypełnienie młyna > czas mielenia. Ponadto d50 był skorelowany z badanymi czynnikami. Średni rozmiar cząstek (d50) tak niski jak 6 μm uzyskano przy 460 obr/min, 20% wypełnieniu młyna i po 60 min mielenia.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 361--366
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Serodiagnosis of Toxoplasmosis using Lateral Flow Chromatographic Immunoassay among Animals and Humans in Sunsari District of Nepal
    Autorzy:
    Sah, Ramesh Prasad
    Talukder, Md Hasanuzzaman
    Rahman, A. K. M. Anisur
    Powiązania:
    https://bibliotekanauki.pl/articles/1167051.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Animals
    Nepal
    human
    seroprevalence
    toxoplasmosis
    Opis:
    Toxoplasmosis is a cosmopolitan parasitic zoonosis, infecting human and other warm blooded animals worldwide. This disease has economic importance in regard to animal reproduction, and it leads to abortions and neonatal complications in humans. This study was carried out to determine the seroprevalence of Toxoplasma gondii in sheep, cattle, cats and human in Inaruwa and surrounding areas of Sunsari district, Nepal. Altogether 336 blood samples, of which 50 from sheep, 92 from cattle, 44 from cats and 150 from human were collected and tested immediately using lateral flow chromatographic immunoassay (Toxo IgG/IgM Combo Rapid test®). Associated biometric information such as age, sex, pregnancy status, occupation, association with cat was recorded and analyzed to determine the association of risk factors with the disease. Data were analyzed using R 3.2.2 (The R foundation for Statistical Computing, 2015). Seroprevalence of toxoplasmosis was detected 12.00% (95% CI: 4.53- 24.31%) in sheep, 8.70% (95% CI: 3.83- 16.42%) in cattle, 36.36% (95%CI: 22.41- 52.23%) in cats and 12.67% (95% CI: 7.80- 19.07%) in human. In case of human, 31 to 45 years age group were found more susceptible to toxoplasmosis (21.74%, OR: 6.4) in comparison to 21 to 30 years (10.0%) and up to 20 years (4.17%) age groups. Toxoplasmosis was found highly significantly associated with abortion (58.33%, OR= 15.4, P=0.0001) in human in the tested individuals. Regarding occupation, 20.83% butchers were seropositive followed by farmers (15.52%), housewives (10.0%) and diagnostic lab technicians (8.0%). Female and higher age group showed high prevalence of toxoplasmosis in all studied species. Therefore, this assay is a useful method for the serological screening of toxoplasmosis in different animals and humans.
    Źródło:
    World Scientific News; 2018, 105; 145-156
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing competency and sub-competency for pharmaceutical 4.0 - a Delphi study
    Ocena kompetencji i podkompetencji dla farmaceutyki 4.0 - badanie Delphi
    Autorzy:
    Putri, Aghnia Nadhira Aliya
    Arief, Neneng Nurlaela
    Gustomo, Aurik
    Roestam, M. Rahman
    Powiązania:
    https://bibliotekanauki.pl/articles/2149915.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    farmaceutyka 4.0
    kompetencje
    podkompetencje
    badania Delphi
    pharmaceutical 4.0
    competency
    sub-competencies
    Delphi study
    Opis:
    This research aims to conduct competency mapping and sub-competencies quantitatively through Delphi method in two rounds to provide comprehensive results. The application of Delphi's approach then refers to several rounds of expert surveys based on existing questionnaires. The first round involved 15 practitioners from the Pharmaceutical Industry. In the first phase, the research explores what competencies are most needed through questionnaires. Furthermore, in phase two, a greater number of participants are obtained through research relations. The second round involves the participation of 71 experts, including practitioners from 19 Pharmaceutical Industries and academics. The results of the study were processed using Exploratory Factor Analysis and produced six factors representing six competencies: learning and innovation skills, research skills, digital skills, bioinformatics, data ethics, and regulatory compliance. In addition, this study produced 44 sub-competencies that representing 6 core competencies. Competencies and sub-competencies achieved can be used as a referral for pharmaceutical practices in the Era of Pharmaceutical 4.0. More research on competencies in the Pharmaceutical Industry is needed to achieve reliable and valid instruments.
    Niniejsze badanie ma na celu ilościowe mapowanie kompetencji i podkompetencji metodą Delphi w dwóch rundach w celu uzyskania kompleksowych wyników. Zastosowanie podejścia Delphi odnosi się następnie do kilku rund ankiet eksperckich opartych na istniejących kwestionariuszach. W pierwszej rundzie wzięło udział 15 praktyków z branży farmaceutycznej. W pierwszej fazie badanie za pomocą kwestionariuszy sprawdza, jakie kompetencje są najbardziej potrzebne. Ponadto w fazie drugiej większą liczbę uczestników uzyskuje się poprzez relacje badawcze. W drugiej turze udział bierze 71 ekspertów, w tym praktycy z 19 Branży Farmaceutycznej oraz pracownicy naukowi. Wyniki badania zostały przetworzone za pomocą eksploracyjnej analizy czynnikowej i wygenerowały sześć czynników reprezentujących sześć kompetencji: umiejętności uczenia się i innowacji, umiejętności badawcze, umiejętności cyfrowe, bioinformatykę, etykę danych i zgodność z przepisami. Ponadto w badaniu uzyskano 44 podkompetencje, które reprezentują 6 kluczowych kompetencji. Uzyskane kompetencje i podkompetencje mogą być wykorzystane jako skierowanie do praktyk farmaceutycznych w Erze Farmaceutyki 4.0. Potrzebne są dalsze badania nad kompetencjami w przemyśle farmaceutycznym, aby uzyskać niezawodne i ważne instrumenty.
    Źródło:
    Polish Journal of Management Studies; 2021, 23, 2; 421--436
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An embedded beamformer for a PID-based trajectory sensing for an autonomous vehicle
    Autorzy:
    Mvemba, P. K.
    Lay-Ekuakille, A.
    Kidiamboko, S.
    Rahman, M. Z. U.
    Powiązania:
    https://bibliotekanauki.pl/articles/221802.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autonomous vehicle
    beamforming
    trajectory follower
    ultrasonic obstacle detector
    measurement
    sensors
    Opis:
    Beamforming is an advanced signal processing technique used in sensor arrays for directional signal transmission or reception. The paper deals with a system based on an ultrasound transmitter and an array of receivers, to determine the distance to an obstacle by measuring the time of flight and - using the phase beamforming technique to process the output signals of receivers for finding the direction from which the reflected signal is received - locates the obstacle. The embedded beam-former interacts with a PID-based line follower robot to improve performance of the line follower navigation algorithm by detecting and avoiding obstacles. The PID (proportional-integral-derivative) algorithm is also typically used to control industrial processes. It calculates the difference between a measured value and a desired set of points, then attempts to minimize the error by adjusting the output. The overall navigation system combines a PID-based trajectory follower with a spatial-temporal filter (beamformer) that uses the output of an array of sensors to extract signals received from an obstacle in a particular direction in order to guide an autonomous vehicle or a robot along a safe path.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 561-575
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bond strength of concrete-filled hollow section with modified fibrous foamed concrete
    Autorzy:
    Khairuddin, S. A. A.
    Rahman, N. A.
    Jamaluddin, N.
    Jaini, Z. M.
    Elamin, A.
    Rum, R. H. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/230151.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    siła wiązania
    pusta sekcja wypełniona betonem
    CFHS
    beton modyfikowany
    beton włóknisty
    beton spieniony
    popiół z łusek ryżowych
    RHA
    wytrzymałość
    metoda push-out
    bond strength
    concrete filled hollow section
    modified fibrous foamed concrete
    rice husk ash
    strength
    push-out method
    Opis:
    The concrete-filled section of columns has been widely in construction used due to its structural elements. As a result, the usage of composite columns has recently increased all over the world. However, using foamed concrete alone does not result in much improvements in strength. Therefore, this paper examines the use of foamed concrete containing fibre to improve the strength of composite columns. Specifically, this study aims to determine the bond strength of concrete-filled hollow section (CFHS) with modified fibrous foamed concrete. Two types of fibre are used in this work, namely, steel fibre and polypropylene fibre, with rice husk ash (RHA) as a sand replacement to improve the compressive strength of foamed concrete. The CFHS with modified fibrous foamed concrete is tested by using the push-out method, and the results show that CFHS with steel fibre has a highest bond strength.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 97-108
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon emissions, energy use, gross domestic product and total population in China
    Autorzy:
    Ahmad, M.
    Hengyi, H.
    Rahman, Z. U.
    Khan, Z. U.
    Khan, S.
    Khan, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/96260.pdf
    Data publikacji:
    2018
    Wydawca:
    Fundacja Ekonomistów Środowiska i Zasobów Naturalnych
    Tematy:
    energy consumption
    carbon emission
    GDP
    Granger causality
    ARDL
    EKC
    zużycie energii
    emisja dwutlenku węgla
    PKB
    przyczynowość w sensie Grangera
    Opis:
    The current study explores the impact of energy consumption, total population, gross domestic product on carbon emissions by utilizing time series data of 1971-2013 for China. Earlier studies concentrated on testing the present form of an environmental Kuznets curve not taking total population in a model. Specifically, this study focuses on analyzing the long run existence of environmental Kuznets curve. The methodology of auto regressive distributed lag model is utilized. The quadratic linkage between national income and emissions of carbon have been detected, confirming the presence of long run linkage between quadratic national income and emissions of carbon. Granger causality test divulge one-way causality between gross domestic product and carbon emissions. The empirical findings also reveal that the energy use and national income are important factors of carbon emanations in the long run. Total population has an insignificant positive influence on emissions of carbon. It is suggested that government should focus to extract that substitute sources of energy which is more environmental friendly.
    Źródło:
    Ekonomia i Środowisko; 2018, 2; 32-44
    0867-8898
    Pojawia się w:
    Ekonomia i Środowisko
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of fresh palm oil mill effluent biodegradation with Aspergillus niger and Trichoderma virens
    Autorzy:
    Jalaludin, N.
    Rahman, R. A.
    Razali, F.
    Barghash, H. F. A.
    Sukri, S. S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/204704.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Aspergillus niger
    optimization
    POME
    palm oil mill effluent
    Trichoderma virens
    Opis:
    In this work, response surface optimization strategy was employed to enhance the biodegradation process of fresh palm oil mill effluent (POME) by Aspergillus niger and Trichoderma virens. A central composite design (CCD) combined with response surface methodology (RSM) were employed to study the effects of three independent variables: inoculum size (%), agitation rate (rpm) and temperature (°C) on the biodegradation processes and production of biosolids enriched with fungal biomass protein. The results achieved using A. niger were compared to those obtained using T. virens. The optimal conditions for the biodegradation processes in terms of total suspended solids (TSS), turbidity, chemical oxygen demand (COD), specific resistance to filtration (SRF) and production of biosolids enriched with fungal biomass protein in fresh POME treated with A. niger and T. virens have been predicted by multiple response optimization and verified experimentally at 19% (v/v) inoculum size, 100 rpm, 30.2°C and 5% (v/v) inoculum size, 100 rpm, 33.3°C respectively. As disclosed by ANOVA and response surface plots, the effects of inoculum size and agitation rate on fresh POME treatment process by both fungal strains were significant.
    Źródło:
    Archives of Environmental Protection; 2016, 42, 1; 63-73
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Groundwater Contamination and Health Risk Evaluation of Naturally Occurring Potential Toxic Metals of Hatiya Island, Bangladesh
    Autorzy:
    Rahman, Mahfuzur
    Khan, Md. Sadril Islam
    Hossain, Mohammad Sabbir
    Hossain, Md. Imam Shohel
    Hasan, Mahmudul
    Hamli, Hadi
    Mustafa, M. Golam
    Powiązania:
    https://bibliotekanauki.pl/articles/2105279.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    drinking water
    toxic elements
    pollution indices
    Hatiya Island
    Opis:
    Groundwater meets the majority portion of drinking water needs, particularly in the rural area of Bangladesh. Groundwater has been continuously contaminated by potentially harmful metals as a result of natural processes as well as some anthropogenic activities, creating a variety of health impacts. The current research aimed to evaluate the naturally occurring level of metal contamination and the human health risk associated with deep groundwater in the Hatiya Island. Because of the arsenic, iron, and salinity problem in shallow groundwater, the inhabitants of the Hatiya Island use deep groundwater. During the field investigation, no shallow tubewells were observed; therefore, only deep groundwater samples were collected. The total sample size collected throughout the Hatiya island was 17. Five metals (Zn, Fe, Mg, Mn, and Cu) were analyzed using an Atomic Absorption Spectrophotometer (AAS). The concentrations of studied potential risky metals were ranked as follows: Mg > Zn > Fe >Mn> Cu. The detected values of all metals except Fe were found within the drinking water limits of WHO (2017), BIS (2012), and BDWS (1997), where only 29.41% of the Fe sample exceeded the standard drinking limits. According to the metal evaluation index (MEI) and degree of contamination (Cd), the groundwater of the study area is free from contamination but the metal pollution index (MPI) and nemerow pollution index (NI) exhibited little pollution in the mid-western part of the study area. The hazard quotient (HQ) values revealed no oral and dermal health risk for individual metals (Cu, Zn, Fe, Mn). On the other hand, the hazard index (HI) values exhibited no risk for combined metals as none of the values exceeded the safety limit value of 1. According to the HQ and HI results, the deep groundwater on Hatiya Island is non-carcinogenic and risk-free for children and adults. However, children were more susceptible to oral health risks than adults. In contrast, adults were more vulnerable to dermal health risks than children.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 6; 223--236
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structured Analysis of Nanostructured Zinc Oxide (ZnO) Thin Films Deposited by Sol-Gel
    Autorzy:
    Hussin, Rosniza
    Hanafi, F.
    Rashid, R. A.
    Harun, Z.
    Kamdi, Z.
    Ibrahim, S. A.
    Ainuddin, A. R.
    Rahman, W.
    Leman, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134100.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sol-gel
    zinc oxide
    ZnO
    thin films
    nanostructured
    Opis:
    In this work, zinc oxide (ZnO) thin films are deposited on glass substrate using the sol-gel spin coating technique. The effect of annealing temperature on structural properties was investigated. The ZnO sol-gel was produced from zinc acetate dehydrate as the starting material with iso-propanol alcohol as the stabilizer. The ratio was controlled, distilled water and diethanolamine as the solvent mixing on a magnetic stirrer for an hour under constant heat of 60°C. The ZnO thin film was deposited using the spin coating technique with the speed of 3000 rpm for 30 minutes before the sample undergoes pre-heat in the oven at the temperature of 100°C for 10 minutes. The sample was annealing in the furnace for an hour at 200°C, 350°C, and 500°C. The X-ray diffraction (XRD) analysis confirms that hexagonal wurtzite structure with zincite and zinc acetate hydroxide hydrate composition. The thin films surface roughness was analyzed using an atomic force microscope (AFM) and scanning electron microscope (SEM) for surface morphology observation.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1055--1060
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Cadmium using Alkaline-Treated Activated Carbon from Leucaena Leucocephala Biomass
    Autorzy:
    Ibrahim, W. M. H. W.
    Sulaiman, Nurul Syuhada
    Amini, Mohd Hazim Mohammad
    Kadir, W. R. A.
    Mohamed, Mazlan
    Ramle, Sitti Fatimah Mhd
    Bilgin, Ugur
    Rahman, Wan
    Powiązania:
    https://bibliotekanauki.pl/articles/2125550.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    activated carbon
    cadmium
    Leucaena leucocephala
    adsorption
    Opis:
    Water contamination that caused by heavy metals is a very common phenomenon in the industrial age. One of the popular way to treat metal contaminated water is by adsorption process using activated carbon as the adsorbent. This paper works on producing activated carbon by chemical means with impregnation ratios of NaOH:char (w/w) was predetermined at 1:1 (ACT1-1), 2:1 (ACT2-1) and 3:1 (ACT3-1) under activation temperature of 700°C. Considering the Leucaena leucocephala is a wildly, easy and fast grown species, with the availability throught the year, it was chosen to be used as the precursor. The properties of these activated carbons and its potential for cadmium removal from aqueus solution was analyzed. It was found that the highest surface area was recorded at 662.76 m²/g. Four parameters were studied which are contact time, the effect of pH, initial concentration of adsorbate and temperature. The equilibrium time was achieved in 40 min treatment at initial concentrations of 30 mg/l. The adsorbent exhibited good sorption potential for cadmium at pH 8.0 and equilibrium temperature of 30℃. Based on the results, this study had proved that activated carbon from Leucaena leucocephala biomass have the good potential to be used for removal of cadmium from wastewater.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1033--1036
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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