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    Wyświetlanie 1-6 z 6
    Tytuł:
    Undrained shear and pore space characteristics of treated loose sands with lime-activated zeolite in saturated settings
    Autorzy:
    Jamhiri, Babak
    Pakbaz, Mohammad Siroos
    Powiązania:
    https://bibliotekanauki.pl/articles/1838092.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    lime alkali
    compressive strength
    shear strength
    void ratio
    pore water pressure
    B-ratio
    wapno alkaliczne
    wytrzymałość na ściskanie
    wytrzymałość na ścinanie
    ciśnienie wody
    Opis:
    This research investigates the mechanical behavior of artificially cemented sandy soils formed by lime alkali activation of natural zeolite under saturation settings. In order to verify the bar capability of cemented sands with this new method, an analysis of the undrained shear strength of the soil with pore water pressure ratio measurements was performed from the interpretation of the results of unconfined compression tests. The effect of zeolite-lime blend on treated sands was also visualized by scanning electron microscopy. For the studied soils, it was concluded from the unconfined compression stress values that the soil is fully capable of withstanding compressions due to overburden pressure. Additionally, this study seeks to evaluate the effect of the void ratio on the pore space and undrained shear strength. The results showed that pore water B-ratio increases with the decrease of the void ratio. Moreover, with the increase of zeolite content, confining pressure, and curing age, the peak failure strength increases. The results indicated a promising consistency of treated samples with lime and zeolite under various values of undrained shearing and B-ratios, making this method an ideal treatment for loose sand deposits.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 2; 105-132
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fuzzy Versus Probabilistic Benefit/cost Ratio Analysis for Public Work Projects
    Autorzy:
    Kahraman, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/908371.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    zbiór rozmyty
    ryzyko
    economic justification
    risk
    fuzzy set theory
    B/C ratio
    Opis:
    The benefit/cost (B/C) ratio method is utilized in many government and public work projects to determine if the expected benefits provide an acceptable return on the estimated investment and costs. Many authors have studied probabilistic cash flows in recent years. They introduced some analytical methods which determine the probability distribution function of the net present value and internal rate of return of a series of random discrete cash flows. They considered serially correlated cash flows and the uncertainty of future capital investment and reinvestment rates and they presented some formulae for the B/C ratio for probabilistic cash flows. In the paper, the expected value and the variance of a probabilistic cash flow are obtained by means of moments. Then a probabilistic B/C ratio is given. Fuzzy set theory has the capability of representing vague knowledge and allows mathematical operators and programming to be applied to the fuzzy domain. The theory is primarily concerned with quantifying the vagueness in human thoughts and perceptions. The fuzzy B/C ratios are developed for a single investment project and for multiple projects having equal or different lives.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2001, 11, 3; 705-718
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Economics analysis of maize hybrid influenced by tillage method and planting density
    Autorzy:
    Thapa, S. B.
    Shrestha, P.
    Basnet, K. B.
    Aryal, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076709.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    B:C ratio
    Economic analysis
    Maize
    Zea mays
    planting density
    tillage method
    Opis:
    The experiment was laid out in a strip-split plot design consisting of 16 treatments with three replications, at NMRP, Rampur, Chitwan during the winter season (October, 2015 to March, 2016). Four different levels of planting geometry (60 cm×30 cm, 60 cm×24 cm, 60 cm×19.5 cm and 60 cm×16.5 cm, representing 55,555, 69,444, 85,470 and 1,01,010 plants ha-1, respectively), two hybrid varieties of maize (Rampur hybrid 4 and Rampur hybrid 6) and two tillage methods (conventional and zero tillage) were used as the treatments. Economic analysis revealed that significantly higher net benefit (NRs. 1,06,692 ha-1) was obtained with 85 rather than 55 thousand plants ha-1 (NRs. 79,249 ha-1), but remained at par with 69 (NRs. 92,656 ha-1) and 101 (NRs. 96,198 ha-1) thousand plants ha-1. Moreover, the B:C ratio was higher in 85 (2.57) than 55 (2.28), 69 (2.43) and 101 (2.35) thousand plants ha-1. The net returns and B:C ratio (NRs. 97,372 and 2.46) obtained from Rampur hybrid 6 were also higher, but statistically at par with Rampur hybrid 4 (NRs. 90,024 and 2.35), respectively. In addition, net returns and B:C ratio obtained from zero tillage (NRs. 1,03,473 and 2.6) were better than conventional tillage (NRs. 83,924 and 2.22). Thus, both hybrid maize varieties (Rampur hybrid 4 and Rampur hybrid 6) can be successfully grown under a zero tillage system with optimum plant population of 85 thousand plants ha-1 to achieve higher grain yield and better winter season net returns in western Chitwan, Rampur, Nepal.
    Źródło:
    World News of Natural Sciences; 2019, 24; 71-78
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neutrophil-lymphocyte ratio and mean platelet volume as predictive factors for liver fibrosis and steatosis in patients with chronic hepatitis B
    Autorzy:
    Pokora-Rodak, A.
    Kiciak, S.
    Tomasiewicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081973.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    neutrophil-lymphocyte ratio
    hepatitis B
    liver fibrosis
    liver steatosis
    Opis:
    Objective. Evaluation of the neutrophil-lymphocyte ratio and mean platelet volume as predictive factors for liver fibrosis and steatosis in HBV patients qualified for antiviral treatment. Materials and method. The study comprised 38 CHB patients who had commenced antiviral treatment, and 20 healthy volunteers who constituted the clinical control group. All patients had their blood count taken and underwent hepatic assessment using transient elastography with CAP (controlled attenuation parameter). Results. It was found that the mean hepatic fibrosis was 8.7 kPa (±8.8) and the mean liver steatosis – 286 db/m (±64). Mean NLR – 2.78(±1.1), whereas in the control group the mean NLR value was 1.64(±0.98). A negative linear correlation (r= -0.34; p=0.035) was found between liver fibrosis and the NLR value in the study group. No correlation was observed between hepatic steatosis and the NLR. Mean MPV – 12.6fl (±3.1), which was considerably higher in the CBH patients than in the control group. A positive correlation (r= 0.79, p= 0.001) was found between MPV and disease severity evaluated with transient elastography. Conclusions. The NLR and the MPV were significantly higher in the CHB patients than in the healthy volunteers. Both the NLR and the MPV can be treated as predictive factors for liver fibrosis in this group of patients.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 4; 690-692
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of length to beam ratio effects on ship resistance using ranse method
    Autorzy:
    Le, Tat Hien
    Nguyen, Duy Anh
    Tran, Ngoc Tu
    Hoa, Nguyen Thi Ngọc
    Ngoc, Vu Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/32917972.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    length-beam ratio
    L/B
    resistance
    hull form
    RANSE
    Opis:
    The paper discusses the length to beam (L/B) ratio effects on ship resistance at three different Froude numbers using unsteady RANSE simulation. First, the JBC ship model was used as an initial hull form for verification and validation of predicted ship resistance results with measured data, and then the influence of the L/B ratio on ship resistance was carried out. Ship hull forms with different L/B ratios were produced from the initial one by using the Lackenby method. The numerical results obtained show the L/B ratio’s effect on ship resistance. Increases of the L/B ratio led to gradual reduction of the total ship resistance and vice versa. Analysis of the changing of the resistance components indicates that the pressure resistance changes are considerably larger than the frictional one. Finally, the paper analyses the difference in the flow field around the hull of the ship with variation of the L/B ratio to fully understand the physical phenomenon in the change of ship resistance at different L/B parameters.
    Źródło:
    Polish Maritime Research; 2023, 1; 13-24
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of b-value variation of earthquakes in Papua New Guinea
    Autorzy:
    Abong, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068605.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    F-ratio
    Papua New Guinea
    b-value
    earthquakes
    least squares
    temporal variation
    Opis:
    This study evaluated the b-value variation of earthquakes in Papua New Guinea region. The data used were extracted from International Seismological Centre (ISC), Pipers Lane, Thatcham, Berkshire, United Kingdom. The selected data consisted of earthquakes with Mb ≥ 2.6 for the study area from 1st January 1966 to 31st December 2015 (50 years) with focal depth from 0 – 700 km. The data were analyzed using Least Squares (LS) approximation method and SPSS Software version 20.0. The findings of this study categorized b-value into three groups: High, moderate and low. High b-value varies from 1.01 to 1.35, moderate b-value lies between 0.8 and 1.0 and low b-value varies from 0.63 to 0.80. This indicates that the years where high b-values occurred predominantly consist of many earthquakes of moderate magnitudes; slight decrease in b-value is associated with many earthquakes of large magnitudes and low b-value is associated with many earthquakes of small magnitudes. The b-value for the whole study area was calculated to be 0.91. The research hypothesis revealed that there is a significant difference in the b-value between the decade groups from 1966 to 2015. The F-ratio between the decade groups was found to be 3.776 with significant value of 0.010. The implication of this study is that temporal variation and monitoring of b-values will serve as one of the reliable ways of earthquake prediction in Papua New Guinea.
    Źródło:
    World Scientific News; 2019, 132; 155-168
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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