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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analysis of the Corrosion Rate of FeMn-Si Biodegradable Material
    Autorzy:
    Roman, Ana-Maria
    Chelariu, Romeu
    Cimpoesu, Ramona
    Stirbu, Ioan
    Ionita, Iulian
    Cazacu, Marius Mihai
    Prisecariu, Bogdan Anton
    Cimpoesu, Nicanor
    Pietrusiewicz, Paweł
    Sodor, Alina
    Powiązania:
    https://bibliotekanauki.pl/articles/2174554.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biodegradable
    Fe-Mn alloy
    degradation rate
    Opis:
    The Fe-based alloy with manganese led to the appearance of new austenitic alloys, with the antiferromagnetic property pursued, resulting in compatibility with the magnetic field as that of magnetic resonance imaging. The corrosion resistance behavior of the biodegradable Fe-Mn-Si alloy was analyzed in a thermostatic chamber at 37±1°C for 24, 48 and 72 hours by immersing in Ringer solution. Also, the cast and laminated samples were subjected to electro-corrosion tests using a potentiostat equipment. Linear and cyclic potentiometry is presented for characterize the corrosion behavior of the experimental samples in electrolyte. Due to the interaction between the alloy and the liquid medium a change in the solution pH was observed. Structure analysis and chemical composition details of the surfaces were obtained using electron scanning microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS).
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1243--1250
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Biodegradation Speed and Biodegradability of Polyethylene and Manihot Esculenta Starch Blends
    Autorzy:
    Abioye, Abiodun A.
    Obuekwe, Chukwunonso
    Fasanmi, Oluwatosin
    Oluwadare, Oreofe
    Abioye, Oluwabunmi P.
    Afolalu, Sunday A.
    Akinlabi, Stephen A.
    Bolu, Christian A.
    Powiązania:
    https://bibliotekanauki.pl/articles/123576.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    degradation rate
    degradation ratio
    biodegradable
    polymer
    manihot esculenta
    Opis:
    Over 350 million tons of conventional plastics are currently produced from petroleum per year and this amount is expected to rise exponentially in the near future. Proper disposal of these products has caused a great problem for the waste management industry and as a result, there is a significant negative impact on the environment. As a matter of fact, in order to reduce the environmental impact of plastics, some products obtained from agriculture (like starch) are used as polymer blend with synthetic plastics. This study shows that Manihot esculenta can be blended with polyethylene to form a partially degradable polymer. The processing conditions and sample formulations are shown to significantly affect the structure of the polymer which has a concomitant effect upon the degradation ratio as well as the degradation rate. Six samples were produced by varying composition of the blend between Low-density Polyethylene and Manihot esculenta using glycerol and water as plasticiser. These samples were buried in soil and the degradation ratios and rates were studied within a period of 28 days. The results showed that these produced biopolymers are environmentally compatible and bio-degradable. The rate of biodegradation in soil of these biopolymer samples varied largely. The polymer blend with 80% LDPE (20 CaS) by weight had the most regular weight loss over the period of the study. Under the conditions the study was carried out, polymer blend 20 CaS also had the steadiest rate of degradation. Hence, 80% LDPE (wt.%) blended with Manihot esculenta starch is the optimal ratio with regard to the degradability of biopolymer in sandy-loam soil.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 2; 65-72
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of the Inverse Gaussian Process with hazard rate functions-based drifts applied to degradation modelling
    Autorzy:
    Rodríguez-Picón, Luis Alberto
    Méndez-González, Luis Carlos
    Pérez-Olguín, Iván JC
    Hernández-Hernández, Jesús Israel
    Powiązania:
    https://bibliotekanauki.pl/articles/2175136.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    inverse Gaussian process
    hazard rate function
    degradation rate
    variable drift
    Opis:
    The stochastic modelling of degradation processes requires different characteristics to be considered, such that it is possible to capture all the possible information about a phenomenon under study. An important characteristic is what is known as the drift in some stochastic processes; specifically, the drift allows to obtain information about the growth degradation rate of the characteristic of interest. In some phenomenon’s the growth rate cannot be considered as a constant parameter, which means that the rate may vary from trajectory to trajectory. Given this, it is important to study alternative strategies that allow to model this variation in the drift. In this paper, several hazard rate functions are integrated in the inverse Gaussian process to describe its drift in the aims of individually characterize degradation trajectories. The proposed modelling scheme is illustrated in two case studies, from which the best fitting model is selected via information criteria, a discussion of the flexibility of the proposed models is provided according to the obtained results.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 3; 590--602
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability modeling for dependent competing failure processes with phase-type distribution considering changing degradation rate
    Autorzy:
    Lyu, Hao
    Wang, Shuai
    Zhang, Xiaowen
    Yang, Zaiyou
    Pecht, Michael
    Powiązania:
    https://bibliotekanauki.pl/articles/2038056.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    dependent competing failure processes
    phase type distribution
    changing degradation rate
    reliability modeling
    survival function
    Opis:
    In this paper, a system reliability model subject to Dependent Competing Failure Processes (DCFP) with phase-type (PH) distribution considering changing degradation rate is proposed. When the sum of continuous degradation and sudden degradation exceeds the soft failure threshold, soft failure occurs. The interarrival time between two successive shocks and total number of shocks before hard failure occurring follow the continuous PH distribution and discrete PH distribution, respectively. The hard failure reliability is calculated using the PH distribution survival function. Due to the shock on soft failure process, the degradation rate of soft failure will increase. When the number of shocks reaches a specific value, degradation rate changes. The hard failure is calculated by the extreme shock model, cumulative shock model, and run shock model, respectively. The closed-form reliability function is derived combining with the hard and soft failure reliability model. Finally, a Micro-Electro-Mechanical System (MEMS) demonstrates the effectiveness of the proposed model.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 4; 627-635
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel reliability model for multi-component systems subject to multiple dependent competing risks with degradation rate acceleration
    Nowatorski model niezawodności dla systemów wieloelementowych narażonych na liczne zależne ryzyka konkurujące uwzględniający przyspieszenie tempa degradacji
    Autorzy:
    Zhang, Y.
    Ma, Y.
    Liu, L.
    Ouyang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/300977.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    zależne ryzyka konkurujące
    analiza czułości
    przyspieszenie tempa degradacji
    model niezawodności
    metoda funkcji kopuły
    dependent competing risks
    degradation rate acceleration
    reliability model
    copula method
    sensitivity analysis
    Opis:
    The purpose of this paper is to establish a new reliability model of the system subject to multiple dependent competing risks. For a system subject to multiple dependent competing risks, the total degradation consists of natural degradation amount and sudden degradation increments (SDIs) caused by random shocks arriving at the system. Most researchers on this topic only focus on the SDIs. However, the impact of random shocks on degradation rate is ignored. In this paper, a novel reliability model considering degradation rate acceleration (DRA) caused by random shocks is proposed, in which the degradation model is based on the degradation path. The dependence relationship between multiple degradation processes is dealt with by copula method, and the arrival time of shocks is assumed to follow a non-homogeneous Poisson process (NHPP). Finally, the effectiveness of the proposed reliability model is demonstrated by an example of a series system. Moreover, the effect of model parameters is evaluated through sensitivity analysis.
    Celem niniejszej pracy było stworzenie nowego modelu niezawodności systemu narażonego na liczne zależne ryzyka konkurujące. W przypadku systemu eksponowanego na wiele zależnych ryzyk konkurujących, na wartość całkowitą degradacji składa się wartość degradacji naturalnej oraz wartość nagłych przyrostów degradacji (sudden degradation increments, SDI) powodowanych przez losowe zaburzenia systemu. Większość badaczy tej tematyki koncentruje się wyłącznie na SDI, ignorując tym samym wpływ zaburzeń losowych na tempo degradacji. W niniejszym artykule zaproponowano nowy model niezawodności uwzględniający przyspieszenie tempa degradacji powodowane zaburzeniami losowymi, w którym model degradacji opiera się na krzywej degradacji. Zależność między mnogimi procesami degradacji rozpatrywano za pomocą metody funkcji kopuły przy założeniu, że czas wystąpienia zaburzenia odpowiada niejednorodnemu procesowi Poissona. Skuteczność proponowanego modelu niezawodności zademonstrowano na przykładzie systemu szeregowego. Ponadto, wykorzystano analizę czułości do oceny wpływu parametrów modelu na niezawodność systemu.
    Źródło:
    Eksploatacja i Niezawodność; 2018, 20, 4; 579-589
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrometallurgical treatment of non-sulfide zinc ore for precipitation of zinc oxide nanoparticles
    Autorzy:
    Abdel-Aal, E.-S. A.
    Rashad, M. M.
    El-Shazly, A. N.
    Ibrahim, I. A.
    El-Shahat, M. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/110748.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zinc ore
    sulfuric acid leaching
    filtration rate
    zinc sulfate
    zinc oxide nanoparticles
    MB photocatalytic degradation
    Opis:
    Acid leaching of Egyptian zinc ore from the Um Gheig area was carried out with sulfuric acid. This study determines the optimum conditions for dissolution of non-sulfide zinc ore. The optimum conditions are 25% -74m particle size, 45 °C temperature, 2 h leaching time, 1.1 stoichiometric molar ratio of H2SO4 to Zn, 1:3 solid/liquid ratio. The maximum filtration rate is 1.6 Mg Zn•m-2•day-1at pressure difference of 0.80 bar. The zinc recovery is about 90%. As the zinc ore contains zinc silicate, some additives were tested to enhance filtration and prevent formation of silica gel. To increase the added value of the product, zinc oxide was precipitated by a co-precipitation method in a nanosize powder with average particle size ~ 20 nm. Photocatalytic degradation of methylene blue dye under UV light using ZnO nanopowders produced at different conditions was investigated. Photocatalytic efficiency with methylene blue (MB) concentration was reduced as much as 85% in 240 min with the produced nanoparticles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 729-737
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resistance of Medical Gloves to Permeation by Methyl Methacrylate (MMA), Ethylene Glocol Dimethacrylate (EGDMA), and 1,4-Butanediol Dimethacrylate (1,4-BDMA)
    Autorzy:
    Lonnroth, E. C.
    Ruyter, I. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/90479.pdf
    Data publikacji:
    2003
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    permeation rate
    degradation
    breakthrough time
    bone cement
    adhesives
    prosthetic materials
    substancje niebezpieczne
    rękawice ochronne
    ochrona skóry
    Opis:
    Gloves afford hand protection by minimizing skin contact. The effectiveness of medical gloves to protect against permeation of the monomers, methyl methacrylate (MMA), ethylene glycol dimethacrylate (EGDMA), and 1,4-butanediol dimethacrylate (1,4-BDMA), was assessed focusing on permeation rates and degradation of glove materials caused by monomer contact. Fifteen different brands of gloves were tested using a European Standard procedure. Surface images of glove materials before and after exposure to the monomer mixture were obtained using a scanning electron microscope. The standard is not applicable as the only method for estimating the safety of gloves, but it is useful as guideline together with the cumulative permeation of acrylic monomers. Monomer contact on the outside resulted in substantial swelling of most glove materials, and structure changes of the inside surface.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2003, 9, 3; 289-299
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of the water composition on the degradation kinetics of natural organic matter in photocatalytic membrane reactors
    Autorzy:
    Rajca, M
    Powiązania:
    https://bibliotekanauki.pl/articles/208135.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    water hardness
    biological materials
    bioreactors
    degradation
    deionized water
    kinetics
    membranes
    rate constants
    surface water
    first order reactions
    natural organic matters
    photocatalytic process
    twardość wody
    materiały biologiczne
    bioreaktory
    degradacja
    woda dejonizowana
    kinetyka
    membrany
    stałe szybkości
    wody powierzchniowe
    reakcje pierwszego rzędu
    naturalne substancje organiczne
    proces fotokatalityczny
    surface waters
    Opis:
    Decomposition kinetics of natural organic substances during the photocatalytic process with a semi-conductor TiO2 has been investigated. In the study, a laboratory reactor Heraeus and in a photocatalytic membrane reactor were used. Simulated solutions of deionized water, surface water and fulvic acids, differing in composition, were tested in the experiment. In order to determine reaction rate constants, the Langmuir–Hinshelwood kinetic model based on the first order reaction was applied. It was found that photocatalytic process enabled effective degradation of natural organic substances although its run was affected by inorganic ions, mainly those producing water hardness, present in water.
    Źródło:
    Environment Protection Engineering; 2015, 41, 1; 29-39
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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