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    Wyświetlanie 1-41 z 41
    Tytuł:
    A tool wear condition monitoring approach for end milling based on numerical simulation
    Autorzy:
    Zhu, Qinsong
    Sun, Weifang
    Zhou, Yuqing
    Gao, Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/1841690.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    tool wear
    sample missing
    sample insufficiency
    numerical simulation
    cutting force
    Opis:
    As an important research area of modern manufacturing, tool condition monitoring (TCM) has attracted much attention, especially artificial intelligence (AI)- based TCM method. However, the training samples obtained in practical experiments have the problem of sample missing and sample insufficiency. A numerical simulation- based TCM method is proposed to solve the above problem. First, a numerical model based on Johnson-Cook model is established, and the model parameters are optimized through orthogonal experiment technology, in which the KL divergence and cosine similarity are used as the evaluation indexes. Second, samples under various tool wear categories are obtained by the optimized numerical model above to provide missing samples not present in the practical experiments and expand sample size. The effectiveness of the proposed method is verified by its application in end milling TCM experiments. The results indicate the classification accuracies of four classifiers (SVM, RF, DT, and GRNN) can be improved significantly by the proposed TCM method.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 2; 371-380
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tool wear condition monitoring in milling process based on data fusion enhanced long short-term memory network under different cutting conditions
    Autorzy:
    Zheng, Guoxiao
    Sun, Weifang
    Zhang, Hao
    Zhou, Yuqing
    Gao, Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/2038054.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    tool wear condition monitoring
    empirical mode decomposition
    variational mode decomposition
    fourier synchro squeezed transform
    neighborhood component analysis
    long short-term memory network
    Opis:
    Tool wear condition monitoring (TCM) is essential for milling process to ensure the machining quality, and the long short-term memory network (LSTM) is a good choice for predicting tool wear value. However, the robustness of LSTM- based method is poor when cutting condition changes. A novel method based on data fusion enhanced LSTM is proposed to estimate tool wear value under different cutting conditions. Firstly, vibration time series signal collected from milling process are transformed to feature space through empirical mode decomposition, variational mode decomposition and fourier synchro squeezed transform. And then few feature series are selected by neighborhood component analysis to reduce dimension of the signal features. Finally, these selected feature series are input to train the bidirectional LSTM network and estimate tool wear value. Applications of the proposed method to milling TCM experiments demonstrate it outperforms significantly SVR- based and RNN- based methods under different cutting conditions.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 4; 612-618
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Education for All and Sustainable Development: An Empirical Study on Family Cognition and Household Resource Using in China
    Edukacja dla wszystkich i zrównoważony rozwój: badania empiryczne nad rodziną i wykorzystaniem zasobów w gospodarstwach domowych w Chinach
    Autorzy:
    Chen, Shuxing
    Gao, Yuxiang
    Powiązania:
    https://bibliotekanauki.pl/articles/371082.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
    Tematy:
    education for all
    sustainable development
    Chinese family cognition
    family resource use
    edukacja dla wszystkich
    rozwój zrównoważony
    chińskie rodziny
    zużywanie zasobów w gospodarstwach domowych
    Opis:
    Education for sustainable development has achieved a lot in the past decade. However, the extent to which sustainable development education can achieve sustainability is still unclear. This article uses the survey data of Chinese families and establishes an empirical analysis model. By using the transition of China's sustainable development education mode as a recognition strategy and using DID method to analyze this issue, we found out that the sustainable education in schools can only help families correctly understand the status quo of sustainable development, but it cannot improve the household sustainability. After implementing the education for sustainable development for all (ESDFA), the average monthly electricity use of the affected Chinese households has decreased by 79.6124 kWh, which is a drop of 41.56%; household carbon dioxide emissions has decreased by 123.8958 kg, which is a drop of 49.16%. Among them, households with their heads aged 40-55 were the most significant. The mechanism analysis shows that the greater the scope of the population covered by ESDFA, the more obvious the effect of reducing family resource use, and there may be a mechanism similar to the herding effect.
    W ramach edukacji dla zrównoważonego rozwoju udało się osiągnąć już wiele. Zarazem pytanie o to, w jakim zakresie ta edukacja wspomaga rzeczywiste osiąganie zrównoważoności pozostaje bez odpowiedzi. W artykule wykorzystano wyniki badań odnoszących się do chińskich rodzin, opracowując empiryczny model analizy. Odnosząc się do obserwowanej zmiany w chińskim systemie edukacji dla zrównoważonego rozwoju, ponadto wspierając się metodą DID, ustaliliśmy, że edukacja w szkołach może tylko pomóc rodzinom w zrozumieniu koncepcji zrównoważonego rozwoju, ale jest niewystarczająca dla poprawy poziomu zrównoważoności na poziomie gospodarstw domowych. Natomiast po wprowadzeniu programu Edukacja dla zrównoważonego rozwoju dla wszystkich (ESDFA) okazało się, że w chińskich gospodarstwach domowych średnie miesięczne zużycie energii elektrycznej zmniejszyło się o 79.6124 kWh, co stanowi spadek o 41.56%, a emisja ditlenku węgla obniżyła się o 123.8958 kg, co stanowi spadek o 49.16%. Najbardziej znaczące wyniki osiągały gospodarstwa, w których głowy rodzin stanowiły osoby w wieku 40-55 lat. Szczegółowa analiza wykazała ponadto, że im większa część populacji poddana zostaje programowi ESDFA, tym większy efekt redukcji zużycia zasobów w gospodarstwie domowym, co prawdopodobnie uwarunkowane jest działaniem mechanizmu podobnego do tzw. efektu stada.
    Źródło:
    Problemy Ekorozwoju; 2019, 14, 1; 199-208
    1895-6912
    Pojawia się w:
    Problemy Ekorozwoju
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Apparel Design Safety and Production Criteria and Models
    Bezpieczne projektowanie i produkcja odzieży – kryteria i modele
    Autorzy:
    Chen, L.
    Yan, X.
    Gao, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/234142.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    apparel safety
    safety attributes
    design
    production model
    safety evaluation
    bezpieczeństwo odzieży
    atrybuty bezpieczeństwa
    projektowanie
    produkcja modelu
    ocena bezpieczeństwa
    Opis:
    A safe apparel design and production (SADP) model was proposed as a system to guide the development of safe apparel. An objective analysis of user needs and examination of safe nutrients used in apparel design uncovered through related technical regulations/standards induction and recall case analysis led to the development of apparel safety needs criteria. The criteria were then translated into apparel safety attributes and used in the development of the SADP model. A theoretical evaluation model remained to be developed for apparel safety purposes using multi-part disassembly. It is hierarchically structured in accordance with apparel safety attributes, and demonstrates how the apparel design safety criteria was used by a design team or an industry worker. By the introduction of the apparel design safety evaluation model, a further shift to pro-action and to the prevention of losses will be made possible. The research also demonstrates the application of the SADP model to a textile product design problem.
    Zaproponowano kilka modeli bezpiecznego projektowania i produkcji odzieży jako systemu pozyskiwania odzieży bezpiecznej. Przeprowadzono obiektywną analizę potrzeb użytkownika, jak również stosowanych w projektowaniu i produkcji części składowych wyposażenia i odzieży. Doprowadziło to do opracowania kryteriów bezpieczeństwa projektowania i użytkowania.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 6 (120); 32-38
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Creep Properties of Nonwoven Fabric with Mechanical Models
    Analiza właściwości pełzania włóknin z zastosowaniem modelu mechanicznego
    Autorzy:
    Gao, X.
    Chen, H.
    Sun, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/231630.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    nonwoven fabric
    viscoelasticity
    creep
    mechanical model
    nonlinear regression
    włókniny i geowłókniny
    lepkosprężystość
    właściwości pełzania
    model mechaniczny
    regresja nieliniowa
    Opis:
    Since nonwoven fabric is widely used in the application of high performance geotextiles, its creep behaviour is essential to be evaluated. In this paper, the creep response of nonwven fabric was studied by using four mechanical models including the one-term generalised Kelvin model, Burger’s model, two-term generalised Kelvin model and Zurek’s model. To verify the feasibility of the models, creep experiments for nonwoven fabric were conducted, and the data were fitted by the four models, respectively, to obtain their parameter values using the Marquardt algorithm for nonlinear regression. When comparing the experimental creep curves with those fitted from the mechanical models, it is obvious that the experimental data was best fitted by Burger’s model. Also, since the residual sum of squares is far less than that of the GK (n = 1) and GK (n = 2) model and the squares of the correlation coefficient are near to unity, it can be concluded that Burger’s model is suitable to describe the creep behaviour of nonwoven fabric. Therefore the viscoelastic model verified can be adopted to predict the creep elongation of nonwoven fabrics.
    W artykule zaprezentowano możliwość zastosowania modeli reologicznych do modelowania zjawiska pełzania włóknin. Włókniny i geowłókniny znajdują szerokie zastosowanie w inżynierii lądowej. Zjawiska jakie zachodzą podczas użytkowania geowłóknin są złożone. Jednym ze zjawisk pojawiających się podczas użytkowania jest poddawanie włókniny i geowłókniny stałym napięciom wynikającym ze zjawiska pełzania. Zastosowano trzy rodzaje modeli reologicznych w oparciu o modele Kelvina, Burgersa i uogólnionego modelu Kelvina. Wygenerowane modele teoretyczne zostały utworzone w celu przewidywania zjawiska pełzania. Adekwatność modeli reologicznych przeprowadzono w oparciu o metodę najmniejszych kwadratów dla estymacji parametrów w nieliniowych modelach regresji Levenberga - Marquardta. Zastosowano modele, które można dopasowywać przy pomocy estymacji metodą najmniejszych kwadratów dowolnej funkcji straty określonej przez użytkownika. Zastosowano funkcję straty do wyboru procedury estymacji, tak że praktycznie we wszystkich przypadkach otrzymano stabilne oceny parametrów modeli. Najlepsze efekty otrzymano przy zastosowaniu modelu Burgersa, który to może być użyty do przewidywania pełzania włókniny w obiektach inżynierskich.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 1 (109); 72-76
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertex-Distinguishing IE-Total Colorings of Complete Bipartite Graphs Km,N(m < n)
    Autorzy:
    Chen, Xiang’en
    Gao, Yuping
    Yao, Bing
    Powiązania:
    https://bibliotekanauki.pl/articles/30146641.pdf
    Data publikacji:
    2013-05-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    complete bipartite graphs
    IE-total coloring
    vertex-distinguishing IE-total coloring
    vertex-distinguishing IE-total chromatic number
    Opis:
    Let G be a simple graph. An IE-total coloring f of G is a coloring of the vertices and edges of G so that no two adjacent vertices receive the same color. Let C(u) be the set of colors of vertex u and edges incident to u under f. For an IE-total coloring f of G using k colors, if C(u) ≠ C(v) for any two different vertices u and v of G, then f is called a k-vertex-distinguishing IE-total-coloring of G, or a k-VDIET coloring of G for short. The minimum number of colors required for a VDIET coloring of G is denoted by χievt(G), and is called vertex-distinguishing IE-total chromatic number or the VDIET chromatic number of G for short. VDIET colorings of complete bipartite graphs Km,n(m < n) are discussed in this paper. Particularly, the VDIET chromatic numbers of Km,n(1 ≤ m ≤ 7, m < n) as well as complete graphs Kn are obtained.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2013, 33, 2; 289-306
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Preparation of Soluble Cellouronic Acid Sodium Salt by 4-Acetamide-TEMPO Mediated Oxidation of Ultrasound-Pretreated Parenchyma Cellulose from Bagasse Pith
    Autorzy:
    Gao, X.
    Chen, K.
    Zhang, H.
    Peng, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/177150.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrasonic pretreatment
    bagasse pith
    parenchyma cellulose
    cellouronic acid sodium salt
    4-acetamide-TEMPO
    Opis:
    The parenchyma cellulose isolated from bagasse pith was used as an alternative resource for preparation of water-soluble cellouronic acid sodium salt (CAS). The influence of ultrasound treatment on the cellulose was investigated for obtaining CAS by regioselective oxidization using 4-acetamide-TEMPO and NaClO with NaClO2 as a primary oxidant in an aqueous buffer at pH 6.0. The yield, carboxylate content and polymerization degree (DP) of CAS were measured as a function of ultrasonic power, agitating time and cellulose consistency by an orthogonal test. The ultrasound-treated conditions were further improved by discussion of ultrasonic power, the most important factor influencing the yield and DP. An optimized CAS yield of 72.9% with DP value (DPv) of 212 was found when the ultrasonic strength is 550 W, agitating time is 3 h and cellulose consistency is 2.0%. The oxidation reactivity of cellulose was improved by ultrasonic irradiation, whereas no significant changes in crystallinity of cellulose were measured after ultrasonic treatment. Moreover, the ultrasound treatment has a greater effect on yielding CAS from parenchyma cellulose than from bagasse fibrous’ one. The CAS was further characterized by Fourier transform infrared spectroscopy (FT-IR) and Scanning electron microscopy (SEM).
    Źródło:
    Archives of Acoustics; 2014, 39, 2; 267-275
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of alpha and gamma radiolysis on Pu retention in the solvent TBP/kerosene
    Autorzy:
    Gao, Y
    Zheng, W.
    Cao, X.
    Chen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148296.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    purex process
    TBP solvent
    alpha radiolysis
    gamma radiolysis
    Pu retention
    Opis:
    In light of the issue of radiolysis of the solvent system in PUREX process, alpha and gamma radiation stability of tributyl phosphate (TBP)/kerosene (OK) have been studied in this paper, in which 238Pu dissolved in the organic phase and 60Co are selected as alpha and gamma irradiation sources, respectively. The amount of the degradation products not easily removed after the washing process has been measured by the plutonium retention. The effects of the absorbed dose, the TBP volume fraction, the cumulative absorbed dose and the presence of UO2 2+ and Zr4+ on the radiolysis of the solvents have been investigated. The results have indicated that the Pu retention increases with the increase of the absorbed dose after alpha or gamma irradiation, and is larger for the solvent containing less TBP. There is competition between UO2 2+ and Pu4+ to complex with the degradation products, and Zr4+ accelerates the radiolysis of the system.
    Źródło:
    Nukleonika; 2014, 59, 4; 123-128
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent progress, opportunities and challenges in collaborative learning and orchestrating creativity
    Autorzy:
    Chen, Junjie
    Gao, Xuhui
    Yan, Longfei
    Xu, Deguang
    Powiązania:
    https://bibliotekanauki.pl/articles/1194013.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Collaborative learning
    Creativity
    Orchestrating learning
    Sociocultural approach
    Teachers working methods
    Opis:
    The role of teacher is increasingly related to designing and arranging collaborative learning situations in which fruitful and creative group work may occur. This thematic review presents recent studies on creativity and collaborative learning from the perspective of the teacher as conductor of learning processes. The precondition for the design and orchestration of these kinds of learning situations is analyzing and understanding of creative and collaborative processes and their contextual adaption. Therefore, the first section of this review focuses on the theoretical vantage points of creativity and collaborative learning mainly from socio-cultural perspective. Based on this theoretical grounding, the second section describes principles for orchestrating productive collaborative learning and supporting creativity from the teacher’s perspective. We discuss three dimensions related to how teachers can bring about collaborative learning and creativity: general pedagogical bases, teachers’ pre- and real-time activities as well as opportunities and challenges for teacher activities. The review is concluded with theoretical and practical implications regarding collaborative learning and creativity.
    Źródło:
    World Scientific News; 2015, 9; 124-143
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent progress in monoaromatic pollutants removal from groundwater through bioremediation
    Autorzy:
    Chen, J.
    Gao, X.
    Yan, L.
    Xu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/11447.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    monoaromatic pollutant
    ground water
    bioremediation
    biodegradation
    benzene
    toluene
    ethylbenzene
    xylene
    Opis:
    Monoaromatic pollutants such as benzene, toluene, ethylbenzene and mixture of xylenes are now considered as widespread contaminants of groundwater. In situ bioremediation under natural attenuation or enhanced remediation has been successfully used for removal of organic pollutants, including monoaromatic compounds, from groundwater. Results published indicate that in some sites, intrinsic bioremediation can reduce the monoaromatic compounds content of contaminated water to reach standard levels of potable water. However, engineering bioremediation is faster and more efficient. Also, studies have shown that enhanced anaerobic bioremediation can be applied for many BTEX contaminated groundwaters, as it is simple, applicable and economical.This paper reviews microbiology and metabolism of monoaromatic biodegradation and in situ bioremediation for BTEX removal from groundwater under aerobic and anaerobic conditions. It also discusses the factors affecting and limiting bioremediation processes and interactions between monoaromatic pollutants and other compounds during the remediation processes.
    Źródło:
    International Letters of Natural Sciences; 2015, 07
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal resource allocation for safety in distributed complex electromechanical systems
    Optymalna alokacja zasobów zapewniająca bezpieczeństwo w złożonych rozproszonych systemach elektromechanicznych
    Autorzy:
    Han, Z.
    Gao, J.
    Xing, L.
    Chen, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/301020.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    straty z tytułu awarii
    prawdopodobieństwo awarii
    sieć złożona
    system złożony
    programowanie dynamiczne
    optymalna alokacja zasobów
    hierarchia bezpieczeństwa
    bezpieczeństwo systemu
    accident loss
    accident probability
    complex network
    complex system
    dynamic programming
    optimal resource allocation
    safety importance
    system safety
    Opis:
    Existing optimal resource allocation for system safety mainly concentrates on series/parallel systems or systems that can be converted into series/parallel models. However, for some distributed complex electromechanical systems, it is very difficult or even impossible to refine them into a series/parallel model; in addition, the safety of some system units is immeasurable because of the coupling relationship complexity in the system composition structure. In this paper, a novel method based on complex networks and path set-based dynamic programming is proposed for the optimal resource allocation for maximal safety of distributed complex electromechanical systems with non-series-parallel structures. As a measurement of the system safety, safety importance is defined, which is a function of two safety feature parameters - accident loss and accident probability. A practical system is taken as an example to illustrate and verify the feasibility and applicability of the proposed method.
    Istniejące strategie optymalnej alokacji zasobów służące zapewnieniu bezpieczeństwa systemów skupiają się głównie na systemach szeregowo-równoległych lub na systemach, które można przekształcić w modele szeregowo-równoległe. Jednakże, w przypadku niektórych złożonych rozproszonych systemów elektromechanicznych, przetworzenie na model szeregowo-równoległy może być bardzo trudne lub wręcz niemożliwe. Dodatkowo, z powodu złożoności relacji sprzężeń w fizycznej strukturze tego rodzaju systemów, bezpieczeństwo niektórych jednostek systemowych jest niemierzalne. W niniejszym artykule przedstawiono nową metodę optymalnej alokacji zasobów gwarantującą maksymalne bezpieczeństwo złożonych rozproszonych systemów elektromechanicznych o strukturze innej niż szeregowo-równoległa. Metoda ta oparta jest na sieciach złożonych i wykorzystuje dynamiczne programowanie bazujące na zbiorach ścieżek. Jako miarę bezpieczeństwa systemu zastosowano pojęcie hierarchii bezpieczeństwa, zdefiniowane jako funkcja dwóch parametrów bezpieczeństwa: strat z tytułu awarii oraz prawdopodobieństwa awarii. Dla zilustrowania proponowanej metody i weryfikacji jej przydatności i możliwości zastosowania, przedstawiono przykład rzeczywistego systemu.
    Źródło:
    Eksploatacja i Niezawodność; 2011, 2; 4-12
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the mechanism and kinetics of sulfuric acid leaching scandium from rich scandium anatase
    Autorzy:
    He, Fei
    Gao, Likun
    Chen, Long
    Rao, Bing
    Shen, Hairong
    Peng, Kebo
    Gao, Guangyan
    Powiązania:
    https://bibliotekanauki.pl/articles/2146896.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    anatase ore
    sulfuric acid
    leaching
    kinetics
    scandium
    Opis:
    Scandium and its compounds have excellent properties, and are widely used in cutting-edge fields such as optics, electronics, and alloys. Thus, scandium is an important strategic metal. However, scandium is extremely sparsely distributed in the earth's crust, rarely occurs as an independent mineral, and requires a complex recovery process. Therefore, the study of the extraction of scandium is of great practical significance. This study examined the leaching test and kinetics of scandium under the acid leaching system of refractory anatase ore. Under appropriate two-stage countercurrent leaching conditions, the first stage of the particle size of fraction of -0.074 mm 82.6%, initial H2SO4 concentration of 6 mol/L, leaching temperature of 100 °C, acid/solid ratio of 3 ml/g, stirring speed of 300 rpm, and leaching time of 50 min; and the second stage of the initial H2SO4 concentration of 11 mol/L, leaching temperature of 150 °C, acid/solid ratio of 4 ml/g, stirring speed of 300 rpm, and leaching time of 50 min, a scandium leaching rate of 96.98% was achieved. The kinetics of scandium leaching conformed to a shrinking-core model, and sulfuric acid concentration and temperature were the most important parameters affecting the scandium leaching rate. The kinetic analysis of scandium leaching at different sulfuric acid concentrations showed that as the concentration increased, the sulfuric acid leaching of scandium changed from being chemical reaction-controlled to internal diffusion-controlled, and the apparent reaction order was 1.2429. The kinetics of scandium leaching at different temperatures showed that the sulfuric acid leaching of scandium was reaction-controlled and the apparent activation energy was 42.21 kJ-mol-1.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 3; art. no. 146171
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tensile-tensile Fatigue Behavior of Multi-axial Warp-knitted Reinforced Composite
    Ocena właściwości mechanicznych i zmęczeniowych kompozytowych dzianin wieloosiowych
    Autorzy:
    Gao, X.
    Tao, N.
    Chen, S.
    Wang, L.
    Wu, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/232142.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    multi-axial warp-knitted fabric composite
    fatigue behavior
    S-N curve
    equivalent residual strength
    kompozytowe dzianiny wieloosiowe
    zmęczenie materiału
    krzywa S-N
    równoważna wytrzymałość resztkowa
    Opis:
    An experimental study was carried out on the fatigue behaviour of multi-axial warp-knitted fabric composites. Composite samples reinforced with multi-axial warp-knitted fabric/matrix were manufactured by the vacuum-assisted resin transfer moulding method. Tensile-tensile fatigue cycling was carried out at different load levels, and S-N curves, tensile stress-strain curve and stiffness degradation of the multi-axial composite samples were obtained. Finally post-fatigue tensile tests were done at a stress level of 75%, at the stages of 1/3N and 2/3N, and the equivalent residual strength and stiffness degradation were obtained.
    Dokonano oceny właściwości mechanicznych i zmęczeniowych kompozytowych dzianin wieloosiowych. Kompozyty wzmocnione dzianiną wieloosiową wytworzono przy zastosowaniu próżniowej metody formowania. Dokonano oceny zmęczenia materiału i właściwości wytrzymałościowych przy różnych poziomach obciążenia. Przedstawiono krzywe S-N, krzywą naprężenie-odkształcenie i degradację sztywności wieloosiowych próbek kompozytowych. Wykonano również testy zmęczenia materiału przy poziomie naprężenia 75%, w etapach 1/3N i 2/3N. Omówiono równoważną wytrzymałość szczątkową i degradację sztywności kompozytowych dzianin wieloosiowych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 1 (127); 73-80
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research of Fluorinated Acrylate Copolymer on Flax Fabric
    Badania wpływu emulsji kopolimeru akrylanowego zawierającej fluor na właściwości tkanin lnianych
    Autorzy:
    Sui, Z.
    Yang, K.
    Chen, J.
    Zhao, X.
    Gao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/234076.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    fluorine-containing acrylate
    core-shell polymerisation
    linen fabric
    finishing agent
    hydrophobicity
    lipophobicity
    fluor
    akrylan
    polimeryzacja rdzeń-otoczka
    tkanina lniana
    hydrofobowość
    lipofobowość
    Opis:
    A fluorine-containing acrylate copolymer emulsion was prepared in this study, which was applied to finishing linen fabric. Dodecafluloroheptry methacrylate (G04) was used as a modified monomer, butylacrylate (BA) and methylacrylate (MMA) as soft and hard monomers.respectively, and acrylic acid as a functional monomer. Structure and properties of the products were characterised and analyzed by FTIR, TEM, PSD and CA measurements, respectively. The water and air permeability as well as the breaking force of the fabric treated were also investigated. The results showed that the fluorine-containing acrylate copolymer emulsion obtained had a core-shell structure, and the microsphere was of nanoscale size. Because of the latex film on the fabric surface, it became smooth and flat. And the increase in G04 was beneficial to the mechanical properties, waterproofness and antifouling ability of the linen fabric. When the content of G04 were increased from 0% to 20%, the water in the linen sample and hexadecane contact angles to the copolymer film increased from 113.02° to 136.08° and from 65.1° to 87.6°,respectively. Furthermore the breaking force of the linen samples was enhanced from 648 N to 721N. However, the increasing content of G04 had negative effects on the flexural rigidity as well as water and air permeability of the fabric, which were essential requirements for the fabric’s application. However, the wash resistance was excellent and the wear-resistance of the finished linen fabric was better than the unfinished linen fabric.
    W pracy przygotowano emulsję kopolimeru akrylanowego zawierającą fluor, którą następnie zastosowano do wykańczania tkanin lnianych. Jako modyfikowany monomer zastosowano metakrylan dodekafluoroheptan (G04), a jako miękkie i twarde monomery użyto akrylan butylu (BA) i akrylan metylu (MMA), a kwas akrylowy jako monomer funkcjonalny. Strukturę i właściwości produktów scharakteryzowano i przeanalizowano za pomocą pomiarów FTIR, TEM, PSD i CA. Przebadano również przepuszczalność wody i powietrza oraz siłę zrywania tkaniny poddanej obróbce. Wyniki wykazały, że otrzymana fluorowa emulsja kopolimeru akrylanowego miała strukturę rdzeń-otoczka, a mikrosfera miała rozmiar w nanometrach. Ze lateksowej powłoce tkanina stała się gładka i matowa. Stwierdzono, że wzrost G04 wpływa korzystnie na właściwości mechaniczne, wodoodporność i zdolność przeciwporostową tkaniny lnianej. Zwiększenie zawartości G04 spowodowało wzrost kąta zwilżania, a siła zrywania próbek zwiększyła się z 648 do 721 N. Jednak wzrastająca zawartość G04 miała negatywny wpływ na sztywność zginania, a także przepuszczalność wody i powietrza tkaniny, które były zasadniczymi cechami wymaganymi dla aplikacji tkaniny. Jednakże odporność na pranie i zużycie była lepsza w przypadku próbek powleczonych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 6 (126); 83-88
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of activated bentonite and its adsorption behavior on oil-soluble green pigment
    Autorzy:
    Zheng, R.
    Gao, H.
    Ren, Z.
    Cen, D.
    Chen, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/110655.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    activated bentonite
    acid activation
    microwave heating
    oil-soluble green pigment
    adsorption
    Opis:
    The present research work focuses on effective preparation of activated bentonite (AB) and its application in removal of oil-soluble green pigment (OSGP) from either vegetable oils or food-processing wastewater. Mono-factor experiments were carried out to explore the effects of operation factors in preparation of AB. The parameters investigated were the effect of contact time, adsorbent dosage, initial OSGP concentration and temperature. The chemical composition, crystalline phases, microstructure and functional groups of prepared AB were characterized and evaluated by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR), respectively. The adsorption kinetics and equilibrium isotherms were studied, finding that the adsorption process fitted better with the pseudo-second-order model and the Freundlich isotherm equation. In addition, thermodynamic parameters, such as standard the Gibbs free energy (ΔG°), standard enthalpy (ΔH°) and standard entropy (ΔS°) were also calculated, indicating that adsorption was spontaneous and endothermic. The findings of this investigation suggest that AB prepared through microwave activation as a cheap adsorbent holds great potential to remove oil-soluble green pigment in the wastewater treatment process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 829-845
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on biaxial dynamical compressive test and PFC2D numerical simulation of artificial rock sample with single joint
    Autorzy:
    Liangxiao, Xiong
    Chen, Haijun
    Gao, Xinghong
    Xu, Zhongyuan
    Hu, Deye
    Powiązania:
    https://bibliotekanauki.pl/articles/2203424.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Dynamic biaxial compression tests and Particle Flow Code numerical simulations of the cement mortar specimens with a single joint were carried out to study the mechanical properties and crack evolution of artificial rock samples with a single joint. The effects of lateral stress σ2, loading rate V, the dip angle β (between the vertical loading direction and the joint) on the biaxial compressive strength σb, and the evolution law of crack were investigated. Test results showed that; (1) when both the dip angle β and the loading rate V remained unchanged, the biaxial compressive strength σb increased with the increase in the lateral stress σ2, while σ2 had no obvious effect on the crack evolution law; (2) when both the dip angle β and the lateral stress σ2 were kept unchanged, the loading rate V had an insignificant effect on the biaxial compressive strength σb and the crack evolution law; (3) when both the lateral stress σ2 and the loading rate V were constant, the biaxial compressive strength σb decreased first and then increased with the increase in the dip angle β; however, the dip angle β did not significantly affect the crack evolution law. The conclusions obtained in this paper are presented for the first time.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 1; 213--229
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The selective depression effect of sodium hexametaphosphate on the separation of chlorite and specularite
    Autorzy:
    Zhao, Fugang
    Yu, Xiankun
    Gao, Xiangpeng
    Li, Mingyang
    Chen, Xiangxiang
    Powiązania:
    https://bibliotekanauki.pl/articles/24085963.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    depressant
    chlorite
    specularite
    adsorption
    Opis:
    Flotation is the most known beneficiation method for the separation of complex and refractory iron ores. As a typical iron-containing silicates, it is difficult to separate chlorite from specularite, because of the similar surface physicochemical properties. In this study, the selective depression effect of sodium hexametaphosphate (SHMP) was conducted via the cationic micro-flotation. The surface adsorption mechanism between SHMP and the two mineral surface was explored through surface adsorption amount tests, Zeta-potential measurements, Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses. The micro-flotation results indicated that SHMP could selectively depress around 90% of chlorite, while its effect on the floatability of specularite was negligible (<20% depressing). The surface adsorption amount tests, Zeta-potential measurements analysis demonstrated that SHMP selectively adsorb on chlorite surface while on the surface of specularite is feeble. The further surface adsorption analysis via FT-IR and XPS proved that SHMP selective adsorption occurred on the chlorite surface mainly by chemisorption mainly through the chelation reaction between O in the phosphate groups of SHMP molecular and metal ions on surface of chlorite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 166495
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect solitons supported by kagome photonic lattices in biased photovoltaic-photorefractive crystals
    Autorzy:
    Hui, J.
    Lu, K.
    Zhao, C.
    Gao, L.
    Chen, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/173797.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    defect solitons
    photonic lattices
    photorefractive nonlinearity
    nonlinear optics
    Opis:
    We report that defect solitons can be supported by kagome photonic lattices with a defect in biased photovoltaic-photorefractive crystals. For a positive defect, these defect solitons exist only in the semi-infinite bandgap and are stable in the low power region but unstable in the high power region. For a negative defect, these defect solitons exist in both of the semi-infinite bandgaps and the first bandgap. In the semi-infinite bandgap, low-power defect solitons are stable when the negative defect depth is low and unstable when the negative defect depth is high, moderate-power defect solitons are stable when the negative defect depth is high, and high-power defect solitons are unstable for all the negative defect depths. In the first bandgap, defect solitons are stable in all the power regions when the negative defect depth is low. When the negative defect depth is high, defect solitons are stable in the high power region and unstable in the low power region. On the other hand, these defect solitons are those studied previously in kagome photonic lattices with a defect in biased non-photovoltaic-photorefractive crystals when the bulk photovoltaic effect is negligible and those in kagome photonic lattices with a defect in photovoltaic-photorefractive crystals when the external bias field is absent.
    Źródło:
    Optica Applicata; 2018, 48, 3; 349-359
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of modified starch on separation of fluorite from barite using sodium oleate
    Autorzy:
    Chen, Z.
    Ren, Z.
    Gao, H.
    Qian, Y.
    Zheng, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/109938.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fluorite
    barite
    modified starch
    flotation
    Opis:
    In this study, a modified starch was utilized to selectively separate barite from fluorite. The results of flotation tests showed that highly selective separation of fluorite from barite was obtained when 250 mg/dm3 of modified starch and 13.16×10−5 mol/dm3 sodium oleate was used in neutral solutions. FTIR spectra results showed that the modified starch can adsorb on the fluorite and barite surfaces. Zeta potential analyses indicated that the modified starch had little effect on adsorption of sodium oleate on the fluorite surface, although it interfered with the adsorption of sodium oleate on the barite surface. Contact angle measurements results corresponded well with the flotation results.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 228-237
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the depression effect of two thiol depressants on the separation of specularite and aegirite
    Autorzy:
    Li, Mingyang
    Zhang, Chen
    Gao, Xiangpeng
    Xie, Xian
    Tong, Xiong
    Powiązania:
    https://bibliotekanauki.pl/articles/2175426.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    aegirite
    specularite
    flotation
    depressant
    iron-bearing silicate
    Opis:
    In this work, two thiol-type reagents, thioglycolic acid (TGA) and mercaptopropionic acid (MPA), were firstly exploited and compared as aegirite depressants with sodium oleate (NaOl) as the collector to separate specularite from aegirite by flotation. The adsorption performances and mechanisms of TGA and MPA on aegirite surface were investigated via flotation experiments, Zeta potential tests, adsorption measurements, contact angle dimensions, and surface characterizations. The results of flotation indicated that TGA and MPA exhibited a considerable depression impact on the flotation of aegirite but little effect on specularite. TGA depicted more excellent depression performance than MPA, which was confirmed by HLB calculation. The results demonstrated that TGA and MPA favorably adsorbed on aegirite surface instead of specularite, hindering the subsequent adsorption of NaOl on specularite and resulting in the surface being hydrophilic. XPS results revealed that TGA and MPA were significantly adsorbed on the surface of aegirite through an interaction between the carboxyl and thiol groups of the depressants and the Si and Fe on the surface of aegirite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 152164
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antioxidant activity and mechanism in flower of Hylocereus undatus (Haw.) Britt. et Rose
    Autorzy:
    Li, X.
    Gao, Y.
    Han, W.
    Lin, J.
    Hu, Q.
    Chen, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/19838.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Hylocereus undatus flower is commonly used as food or for medicinal purposes in south China. To study its antioxidant activity and mechanism we used antioxidant and chemical assays to compare two commercial samples from different locations (Shenjing, Qixing). The difference in antioxidant levels corresponded with differences in chemical content (including total phenolics, total flavonoids, kaempferol and quercetin) between Shenjing and Qixing. The antioxidant ability of H. undatus flower seems attributable to total phenolics (mainly total flavonoids). Kaempferol is one of the main bioactive components. H. undatus flower exerts its antioxidant effects through metal chelation and radical scavenging via hydrogen atom (H•) and electron (e) donation.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2013, 55, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forecasting short-term electric load using extreme learning machine with improved tree seed algorithm based on Lévy flight
    Autorzy:
    Chen, Xuan
    Przystupa, Krzysztof
    Ye, Zhiwei
    Chen, Feng
    Wang, Chunzhi
    Liu, Jinhang
    Gao, Rong
    Wei, Ming
    Kochan, Orest
    Powiązania:
    https://bibliotekanauki.pl/articles/2087016.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    short-term electric load forecast
    extreme learning machine
    Lévy flight
    tree-seed algorithm
    Kernel principal component analysis
    Opis:
    In recent years, forecasting has received increasing attention since it provides an important basis for the effective operation of power systems. In this paper, a hybrid method, composed of kernel principal component analysis (KPCA), tree seed algorithm based on Lévy flight (LTSA) and extreme learning machine (ELM), is proposed for short-term load forecasting. Specifically, the randomly generated weights and biases of ELM have a significant impact on the stability of prediction results. Therefore, in order to solve this problem, LTSA is utilized to obtain the optimal parameters before the prediction process is executed by ELM, which is called LTSA-ELM. Meanwhile, the input data is extracted by KPCA considering the sparseness of the electric load data and used as the input of LTSA-ELM model. The proposed method is tested on the data from European network on intelligent technologies (EUNITE) and experimental results demonstrate the superiority of the proposed approaches compared to the other methods involved in the paper.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 2; 153--162
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Tensile Properties and Microstructures of Different Sites in Al-Si Alloy Casting Component
    Autorzy:
    Tao, Jianquan
    Xiang, Lin
    Chen, Xidong
    Sun, Jipeng
    Wang, Yanbin
    Du, Chuanhang
    Peng, Feifei
    Gao, Shiqing
    Chen, Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/27765052.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    ZL114A alloy
    plaster-mold casting
    tensile properties
    microstructure
    fracture
    Opis:
    The tensile properties and microstructures of ZL114A alloy component with a complex shape are investigated at room temperature and 200°C, using the tensile tests, scanning electron microscopy and electron backscattering diffraction. Both thin wall and thick structure exhibit excellent properties, of which max ultimate tensile strength and elongation at break reach 314 MPa and 2.5% at room temperature, respectively. The ultimate tensile strengths of thin wall are 40 MPa and 25 MPa greater than those of thick structure at room temperature and 200°C, respectively. Moreover, the eutectic Si phases of thin wall exhibit a predominantly spherical morphology while of the morphology of thick structure are rod-like, resulting in the different mechanical properties between thin wall and thick structure. The fracture morphologies of thin wall and thick structure are studied to explain the difference in performance between thin wall and thick structure.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 585--589
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comprehensive service quality evaluation of public transit based on extension cloud model
    Autorzy:
    Hu, Xinghua
    Chen, Xinghui
    Zhao, Jiahao
    Yu, Kun
    Long, Bing
    Dai, Gao
    Powiązania:
    https://bibliotekanauki.pl/articles/2173929.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    traffic engineering
    public transit
    urban traffic congestion
    service quality
    optimization
    sustainable development
    inżynieria ruchu
    transport publiczny
    zatory komunikacyjne
    ocena jakości usług
    optymalizacja
    zrównoważony rozwój
    Opis:
    Prioritizing the development of public transit and enhancing its attractiveness is an important way to solve the problem of urban traffic congestion and achieve sustainable development. To improve the service quality and overall operational efficiency of urban public transit, an evaluation index system related to the comprehensive experience of passengers, service supply quality of public transit enterprises, and supervision of management departments was introduced from both the demand and the supply of public transit travel services. Based on the data distribution characteristics of the boxplot in statistics, the evaluation level and corresponding value range of each index were determined, and the comprehensive weight of the index was determined using the linear weighting method combining the analytic hierarchy process and the entropy weight method, so as to reduce the influence of single weighting method on the evaluation results of comprehensive service quality of public transit. An evaluation method of public transit comprehensive service quality based on the extension cloud model was established. The evaluation results of the model were obtained by calculating the cloud affiliation and comprehensive certainty, and a reliability factor was used to test the evaluation results, which solved the problem of randomness and fuzziness in the process of comprehensive service quality evaluation of public transportation and made the evaluation results closer to the reality. Finally, the established comprehensive evaluation model was applied to a city for example analysis, and the corresponding evaluation level was obtained as good. The value of the reliability factor in the model was less than 0.01, indicating that the model has good applicability and a certain application value for the comprehensive service quality evaluation of public transit. The evaluation method fully considered a variety of evaluation indicators, specified the evaluation level of comprehensive service quality of public transit, and the evaluation results provide a theoretical basis for public transport enterprise to make targeted improvement measures.
    Źródło:
    Archives of Transport; 2022, 61, 1; 103--115
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular cloning, expression and characterization of Bmserpin-2 gene from Bombyx mori
    Autorzy:
    Pan, Ye
    Xia, Hengchuan
    Lü, Peng
    Chen, KePing
    Yao, Qin
    Chen, Huiqin
    Gao, Lu
    He, Yuanqing
    Wang, Lin
    Powiązania:
    https://bibliotekanauki.pl/articles/1040486.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    serpin-2
    Bombyx mori
    bioinformatics
    subcellular location
    qPCR
    Opis:
    Serpins are a broadly distributed family of protease inhibitors. In this study, the gene encoding Bombyx mori serpin-2 (Bmserpin-2) was cloned and expressed in E. coli. The Bmserpin-2 cDNA contains a 1125 bp open reading frame (ORF). The deduced protein has 374 amino-acid residues, contains a conserved SERPIN domain and shares extensive homology with other invertebrate serpins. RT-PCR analysis showed that Bmserpin-2 was expressed in all developmental stages of B. mori larvae and various larval tissues. Subcellular localization analysis indicated that Bmserpin-2 protein was located in the cytoplasm. Interestingly, real-time quantitative PCR revealed that the expression of Bmserpin-2 in the midgut of susceptible B. mori strain 306 significantly increased at 72 hours post inoculation (hpi) when infected with BmNPV. However, there was no significant increase of the Bmserpin-2 expression in resistant strain NB infected with BmNPV. Thus, our data indicates that Bmserpin-2 may be involved in B. mori antiviral response.
    Źródło:
    Acta Biochimica Polonica; 2009, 56, 4; 671-677
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elevated-temperature tensile deformation and fracture behavior of particle-reinforced PM 8009Al matrix composite
    Autorzy:
    Chen, Shuang
    Chen, Guoqiang
    Gao, Pingping
    Liu, Chunxuan
    Wu, Anru
    Dong, Lijun
    Huang, Zhonghua
    Ouyang, Chun
    Zhang, Hui
    Powiązania:
    https://bibliotekanauki.pl/articles/2173538.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum matrix composite
    aluminum alloy 8009
    elevated-temperature tensile property
    interface
    fracture behavior
    kompozyt z osnową aluminiową
    stop aluminium 8009
    właściwość rozciągania w podwyższonej temperaturze
    zachowanie pęknięć
    Opis:
    Tensile tests of 8009Al alloy reinforced with SiC and Al₂O₃ particles fabricated by powder metallurgy (PM) were conducted at temperatures of 250–350°C and strain rates of 0.001–0.1 s⁻¹. The ultimate tensile strength and yield strength of the samples decreased while the temperature and strain rate increased. The elongation slightly decreased at first and then increased with growing temperature because of the medium-temperature brittleness of the alloy matrix. When the strain rate was 0.1 s⁻¹, the elongation of the 8009Al/Al₂O₃ composites always decreased with an increase in temperature because of the poorly coordinated deformation and weak bonding between the matrix and Al₂O₃ particles at such a high strain rate. The work-hardening rates of the composites sharply increased to maxima and then decreased rapidly as the strain increased. Meanwhile, the 8009Al/SiCₚ composites displayed superior UTS, YS, elongation, and work-hardening rates than those of the 8009Al/Al₂O₃ composites under the same conditions. Compared to 8009Al alloys reinforced with spherical Al₂O₃ particle, 8009Al alloys reinforced with irregular SiC particles exhibited a better strengthening effect. The fracture mechanism of the 8009Al/SiCₚ composites was mainly ductile, while that of the 8009Al/Al₂O₃ composites was primarily debonding at the matrix–particle interfaces in a brittle mode.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e138846, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of sodium petroleum sulfonates with different molecular weights for flotation of kyanite ore
    Autorzy:
    Chen, B. Z.
    Gao, H.
    Li, Y.
    Jin, J.
    Ren, Z.
    Wang, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/109492.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    evaluation
    sodium petroleum sulfonate
    kyanite
    flotation kinetics
    entrainment
    Opis:
    The flotation performance of sodium petroleum sulfonates with different molecular weights was evaluated for flotation of a kyanite ore, by investigating valuable mineral recovery-grade, flotation kinetics and gangue entrainment. The results indicated that the higher molecular weight of agent, the higher final cumulative kyanite recovery was, with the maximum value of 72% being obtained with KY-3 with the molecular weight of 438. The final cumulative kyanite grade initially increased, and then decreased with the molecular weight increasing. In other words, the maximum final cumulative kyanite grade (i.e. 89.05%) was obtained with KY-2 with the molecular weight of 392. The kyanite flotation kinetics followed the first order kinetics well, while the modified flotation rate constant showed a decreasing trend after the initial increase as the molecular weight increased. In addition, the overall entrainment degree decreased with decreasing molecular weight of sodium petroleum sulfonates. The use of KY-2 in kyanite flotation was an attractive option in comparison with KY-1 and KY-3.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 956-968
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of nanoscale zero-valent iron doped carbonized zeolitic imidazolate framework-8 for methylene blue removal in water
    Autorzy:
    Chen, Shuai
    Qiao, Lemeng
    Feng, Xuejiao
    Huang, Yufu
    Gao, Guilan
    Guan, Jie
    Lin, Donghai
    Powiązania:
    https://bibliotekanauki.pl/articles/2204144.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Nanoscale zero-valent iron
    Carbonized zeolitic imidazolate framework-8
    Mesoporous carbon
    Methylene blue
    Opis:
    Nanoscale zero-valent iron-doped carbonized zeolitic imidazolate framework-8 (nZVI/CZIF-8) was prepared by carbonation of ferric nitrate and ZIF-8 at 800 °C and used as an adsorbent to remove methylene blue (MB) from water. The synthesized nZVI/CZIF-8 has a specific surface area of 806.9 m2/g, a pore volume of 0.86 cm3/g and an nZVI content of 1.35%, respectively. Both the nZVI/CZIF-8 and CZIF-8 have identical functional groups of O-H, C-H and C=C. With the increase of CZIF-8 size, MB removal rate increased. The doping of nZVI increased the MB removal percentage from 74.5% for ZIF-8 to 96.2% within 80 min for nZVI/CZIF-8. The MB removal percentage increased with the dosage of nZVI/CZIF-8. The MB adsorption with the adsorbents conforms to the Freundlich adsorption isothermal model and the removal rate fitted well to a pseudo-first-order model. The results demonstrate the feasibility of synthesizing high active and stable nZVI/CZIF-8 particles.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 1; 12--19
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generation of three-port splitter by double-layer grating in second-order Littrow configuration
    Autorzy:
    Gao, Chenhao
    Wang, Bo
    Fu, Chen
    Fang, Jimin
    Wen, Kunhua
    Meng, Ziming
    Nie, Zhaogang
    Xing, Xiangjun
    Chen, Li
    Lei, Liang
    Zhou, Jinyun
    Powiązania:
    https://bibliotekanauki.pl/articles/174662.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    three-port splitter
    second-order Littrow
    double-layer grating
    Opis:
    In this paper, a novel double-layer three-port grating is described. The incident grating structure is in the second-order Littrow configuration. The grating region is composed of fused silica and Ta2O5.The designed grating beam splitter has high efficiency under TE polarization and TM polarization, respectively. The efficiency of two polarizations is more than 90%. In addition, compared with a single-layer three-port grating, this new beam splitter has good fabrication tolerance and incident bandwidth. Therefore, the optimized structure has a good application value.
    Źródło:
    Optica Applicata; 2020, 50, 2; 271-280
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two Gln187 mutants of human soluble APRIL inhibit proliferation of lung carcinoma A549 cells
    Autorzy:
    Dai, Shuangshuang
    Zheng, Yingru
    Chen, Bin
    Gao, Min
    Zhang, Yan
    Zhang, Li
    Gong, Wei
    He, Fengtain
    Powiązania:
    https://bibliotekanauki.pl/articles/1040492.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    APRIL
    Gln187 mutant of sAPRIL
    anti-tumor activity
    Opis:
    Soluble APRIL (sAPRIL), the active form of a proliferation-inducing ligand (APRIL), is implicated in the proliferation of tumor cells. Suppressing APRIL function has been considered as a potential strategy for the therapy of APRIL-associated tumors. In the present study, we generated human sAPRIL and its two mutants, Gln187-D-sAPRIL (Gln187 deleted) and Gly187-sAPRIL (Gln187 replaced by Gly). In vitro experiments showed that the two mutants had similar specific binding capacity to lung carcinoma A549 cells compared to the wild-type sAPRIL, and both, especially Gly187-sAPRIL, exhibited significant antagonistic effect on sAPRIL-induced tumor cell proliferation in a dose-dependent manner, which might be predominantly mediated by blocking sAPRIL-induced MEK and ERK phosphorylation but not p38MAPK or JNK signaling. In vivo experiments with nude mice bearing A549 cell-derived xenograft tumor showed that only the Gly187-sAPRIL mutant could significantly suppress the tumor growth. These results suggest that Gln187 may be a crucial amino acid in APRIL-mediated tumor cell proliferation via the MEK-ERK signaling pathway and that the sAPRIL mutants may serve as novel potential antagonists of APRIL for the therapy of APRIL-associated cancers.
    Źródło:
    Acta Biochimica Polonica; 2009, 56, 4; 703-710
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective comminution and grinding mechanisms of spent carbon anode from aluminum electrolysis using ball and rod mills
    Autorzy:
    Ni, Chao
    Zhou, Shaoqi
    Gao, Jixuan
    Bu, Xiangning
    Chen, Yuran
    Alheshibri, Muidh
    Xie, Guangyuan
    Li, Biao
    Powiązania:
    https://bibliotekanauki.pl/articles/2146907.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    selective comminution
    ball mill
    rod mill
    spent carbon anode
    grinding mechanizm
    Opis:
    The recovery of spent carbon anode (SCA) materials plays important roles in environment protection and resources recycling, while this cannot be efficiently achieved without liberation. In this study, grinding characteristics of spent carbon anode from aluminum electrolysis in both ball mill and rod mill were analyzed, and compared based on the utilization of the selective Fuerstenau upgrading curves. In addition, the different grinding mechanisms of ball and rod milling were evaluated by analyzing the shape factor and surface roughness of the ground samples. Results of mineralogical characterizations indicated that carbon particles (d50 = 46.86 μm) presented in the SCA were closely associated with cryolite particles. At 5 min grinding time, the maximum selective comminution factor (β) values of ball milling and rod milling were 2.00 and 1.63, respectively, indicating a higher degree of selective comminution of SCA was achieved from ball milling. Comparisons of the valuable component content (cv, cum) of -125 μm ground particles and the shape characterizations of 74–125 μm ground particles generated from ball and rod milling manifest that a direct relationship exists between the degree of selective comminution and the grinding mechanism.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 3; art. no. 145667
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cryogenic Treatment on Wear Resistance and Microstructure of 42CrMo Steel
    Autorzy:
    Zhang, Haidong
    Yan, Xianguo
    Chen, Zhi
    Zhao, Minna
    Tang, Liang
    Gao, Yuan
    Li, Fan
    Huang, Yao
    Li, Junji
    Powiązania:
    https://bibliotekanauki.pl/articles/2048794.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cryogenic treatment
    orthogonal design method
    hardness
    coefficient of friction
    wear resistance
    microstructure
    Opis:
    In this work, thermo-mechanically treated 42CrMo steel was subjected to cryogenic treatment conducted by means of orthogonal design method, followed by low-temperature tempering to investigate the effect of different parameters of cryogenic treatment on wear resistance of 42CrMo steel and to optimize parameters of cryogenic treatment for improving wear resistance. The results of hardness test and wear test show that cryogenic treatment significantly improves wear resistance with marginal changes in coefficient of friction and hardness. Specifically, cryogenic temperature has the largest impact on wear resistance of 42CrMo steel, holding time has medium impact, and the parameter of treatment cycles has the least impact. The optimum parameters of cryogenic treatment are -196°C for 12 hours with one cycle for improving wear resistance. The results of scanning electron microscopy (SEM) and X-ray diffractometry (XRD) analysis indicate that marginal changes in hardness and coefficient of friction may be owing to little amount of transformation of retained austenite, and the significant influence of cryogenic treatment on improving wear resistance of 42CrMo steel can be mainly attributed to segregation of carbon atoms promoted by cryogenic treatment resulting in more precipitation of carbides in subsequent tempering.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 127-135
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffraction mechanism of five-port transmission gratings
    Autorzy:
    Gao, Chenhao
    Wang, Bo
    Wen, Kunhua
    Meng, Ziming
    Wang, Qu
    Nie, Zhaogang
    Xing, Xiangjun
    Chen, Li
    Lei, Liang
    Zhou, Jinyun
    Powiązania:
    https://bibliotekanauki.pl/articles/1835817.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    1 × 5 splitting
    single-groove grating
    normal incidence
    Opis:
    This paper designs a five-port transmission grating under normal incidence. Rigorous coupled-wave approach is used to optimize the grating parameters. The energy of the grating is mainly dispersed to the 0th, ±1st and ±2nd orders. The efficiency of each diffraction order under both polarizations is close to 20%. The modal method is used to describe the propagation mechanism of the two polarized lights in the grating, and the diffraction behavior of the grating is analyzed. In addition, the grating has a wide range of incident characteristics and a large process tolerance. Therefore, this five-port beam splitter with a connecting layer will be a good polarization-independent beam splitting device.
    Źródło:
    Optica Applicata; 2020, 50, 4; 609-618
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of oleic acid in different solvent media on BRL 3A cell growth and viability
    Autorzy:
    Liu, Runqi
    Yang, Wei
    Xia, Cheng
    Chen, Yuanyuan
    Gao, Sansi
    Dong, Zhihao
    Huang, Baoyin
    Li, Ruirui
    He, Ping
    Xu, Chuang
    Powiązania:
    https://bibliotekanauki.pl/articles/1038377.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    oleic acid
    non-alcoholic fatty liver disease
    liver lipid deposition
    Opis:
    Oleic acid (OA) is widely used in pathology studies of hepatocellular lipid deposition. Identifying the effects of different solvents on OA-induced liver lipid deposition would be beneficial for studies on hepatocytes. We treated BRL 3A cells with OA dissolved in different solvents. After 12 h incubation, cell viability was assessed using MTT assays. Reactive oxygen species (ROS), triglyceride (TG) and total cholesterol (TC) counts, and the expression level of glucose regulated protein (GRP78), sterol regulatory element binding protein (SREBP-1C) and fatty acid synthase (FAS) were analyzed. Water, PBS and DMSO were disadvantageous to the dissolution of OA and did not cause an OA-induced response in hepatocytes. In the alcohol+OA-treated cells, the severe ER stress, oxidative stress and cellular fat deposition were significantly increased. BSA promoted cell growth and the cells treated with 1.2% BSA+OA showed a lower grade TG and endoplasmic reticulum stress compared with KOH+OA and alcohol+OA treatments. KOH had no significant influence on BRL 3A cells viability. When treated with OA dissolved in KOH, BRL 3A cells showed a typical hepatocyte damage. KOH was considered the suitable choice for an OA solvent for BRL 3A cells in hepatic lipidosis research.
    Źródło:
    Acta Biochimica Polonica; 2018, 65, 3; 443-447
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MGF360-12L of ASFV-SY18 is an immune-evasion protein that inhibits host type I IFN, NF-κB, and JAK/STAT pathways
    Autorzy:
    Chen, Q.
    Wang, X.X.
    Jiang, S.W.
    Gao, X.T.
    Huang, S.Y.
    Liang, Y.
    Jia, H.
    Zhu, H.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647496.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    African swine fever virus
    MGF360-12L
    type I IFN
    NF-κB
    JAK/STAT
    Opis:
    African swine fever virus (ASFV) causes feverous and hemorrhagic disease of domestic pigs and European wild boars with high mortality, yet no commercial vaccine is currently available. Several ASFV strains with natural deletion or gene-targeted knockout of multiple MGF360 and MGF505 genes are attenuated in vitro and in vivo, and can offer full protection against homologous challenge. However, the mechanisms underlying the protection are not fully understood. This study aims to investigate the effects of MGF360-12L of ASFV-SY18 on the cGAS-STING signaling pathway and explore the potential mechanisms. We identified that ASFV-SY18 MGF360-12L could inhibit cGAS-STING, TBK1, or IRF3-5D-stimulated IFN-β expression and ISRE activation. Specifically, MGF360-12L inhibits both the activation of PRD(III-I) in a dose-dependent manner, and suppresses the exogenous expression of TBK1 and IRF3-5D. MGF360-12L could block NF-κB activation induced by overexpression of cGAS-STING, TBK1, IKKβ. Downstream of the IFN-β signaling, MGF360-12L blocks the ISRE promoter activation by reducing total protein level of IRF9. Moreover, MGF360-12L protein can inhibit IFN-β-mediated antiviral effects. In conclusion, our findings suggest that MGF360-12L is a multifunctional immune-evasion protein that inhibits both the expression and effect of IFN-β, which could partially explain the attenuation of relevant gene-deleted ASFV strains, and shed light on the development of efficient ASFV live attenuated vaccines in the future.
    Źródło:
    Polish Journal of Veterinary Sciences; 2023, 26, 1; 119-130
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterized Microstructure and Electrical Properties of Hydrogenated Nanocrystalline Silicon Films by Raman and Electrical Conductivity Spectra
    Autorzy:
    Xiao-Yong, Gao
    Jian-Tao, Zhao
    Yu-Fen, Liu
    Qing-Geng, Lin
    Yong-Sheng, Chen
    Jin-Hua, Gu
    Shi-E, Yang
    Jing-Xiao, Lu
    Powiązania:
    https://bibliotekanauki.pl/articles/1808127.pdf
    Data publikacji:
    2009-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.23.Cq
    73.61.-r
    Opis:
    Microstructure and electrical properties of hydrogenated nanocrystalline silicon (nc-Si:H) film deposited on glass substrate at low temperature were characterized by average grain size, crystallinity, and dark electrical conductivity data obtained from the Raman and electrical conductivity spectroscopy, respectively. The average grain size, crystallinity and electrical conductivity have a similar change with substrate temperature. A threshold substrate temperature determined by silane concentration appears in their corresponding spectroscopy vs. substrate temperature. The dependence of crystallinity, average grain size and electrical conductivity on substrate temperature were accounted for by surface diffusion model and heterojunction quantum dot model, respectively.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 3; 738-741
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Myocardial remodeling in rats with metabolic syndrome: role of Rho-kinase mediated insulin resistance
    Autorzy:
    Li, Chuan-Bao
    Li, Xiao-Xing
    Chen, Yu-Guo
    Gao, Hai-Qing
    Bao, Cheng-Mei
    Liu, Xiang-Qun
    Bu, Pei-Li
    Zhang, Juan
    Zhang, Yun
    Ji, Xiao-Ping
    Powiązania:
    https://bibliotekanauki.pl/articles/1039743.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Rat
    Metabolism
    Myocardium
    Phosphorylation
    Insulin resistance
    Opis:
    Insulin resistance (IR) plays a critical role in metabolic syndrome (MS). Previous studies have demonstrated that activated ROCK is increased in MS patients. However, the effect of Rho-kinase (ROCK) on IR has not been definitely determined. Thus, the aims of the present study were to determine whether ROCK activation induces IR or affects myocardial structure and function, as well as the possible mechanisms underlying this process. Wistar rats fed high fat, high glucose and high salt diet sewed as model of MS and we used transmission electron microscopy, echocardiogram technology, and terminal deoxynucleotidyl transferase-mediated DNA nick-end labeling staining to identify any myocardial damage. The protein levels of MYPT-1 (characteristic of ROCK activation), IRS-1 and AKT were analyzed by immunohistochemistry and Western blotting. In hearts from MS rats, we found increased protein levels of phospho-MYPT-1 and phospho-IRS-1 (Ser307) and decreased phospho-AKT compared to levels in normal rats. In conclusion, the results suggest that ROCK-mediated IR is involved in the development of myocardial impairments in MS rats and that this effect is mediated probably via the IRS-1/PI3-kinase/AKT pathway.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 2; 249-254
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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