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    Tytuł:
    Power Allocation for Energy-Harvesting-based Fading Cognitive Multiple Access Channels : with or without Successive Interference Cancellation
    Autorzy:
    Li, Q.
    Xu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/963855.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cognitive radio
    power allocation
    multiple access channels
    energy harvesting
    Opis:
    This paper considers a fading cognitive multiple access channel (CMAC), where multiple secondary users (SUs), who share the spectrum with a primary user (PU), transmit to a cognitive base station (CBS). A power station is assumed to harvest energy from the nature and then provide power to the SUs. We investigate the power allocation problems for such a CMAC to maximize the SU sum rate under the interference power constraint, the sum transmit power constraint and the peak transmit power constraint of each individual SU. In particular, two scenarios are considered: with successive interference cancellation (SIC) and without SIC. For the first scenario, the optimal power allocation algorithm is derived. For the second scenario, a heuristic algorithm is proposed. We show that the proposed algorithm with SIC outperforms the algorithm without SIC in terms of the SU sum rate, while the algorithm without SIC outperforms the algorithm with SIC in terms of the number of admitted SUs for a high sum transmit power limit and a low peak transmit power limit of each individual SU.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 1; 65-72
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Joint optimization of replacement and spare ordering for critical rotary component based on condition signal to date
    Wspólna optymalizacja wymiany i zamawiania części zamiennych dla krytycznego komponentu obrotowego na podstawie dotychczasowego sygnału stanu
    Autorzy:
    Chen, X.
    Xu, D.
    Xiao, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/301404.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    prognozowanie degradacji
    degradation prediction
    failure probability
    condition-based replacement
    spare part ordering
    prawdopodobieństwo wystąpienia uszkodzenia
    wymiana w oparciu o stan
    zamawianie części zamiennych
    Opis:
    It is widely accepted that condition-based replacement can not only make full use of components, but also decline inventory cost if the procurement of spare parts can be triggered upon accurate failure prediction. Most of the existing degradation or failure prediction models and approaches are population-based failures or suspensions, namely, to predict the failure time of a component, there are some failure or suspension histories of same type or similar components which can be used as reference. However, in practice, there exists the phenomenon in which no failure or suspension histories for some components can be used, what can be utilized is just the collected condition monitoring signals to date. In that case, failure time and probability are difficult to be estimated accurately. In this paper, a novel degradation prediction approach is introduced. Meantime, a new failure probability estimation function is developed based on component “service time” and “degradation extent” simultaneously. Then replacement and spare part ordering are jointly optimized according to the estimated failure probability. The optimization objective is to minimize long-run cost rate. Two bearing datasets are used to validate the proposed approach.
    Powszechnie przyjmuje się, że wymiana w oparciu o stan techniczny pozwala nie tylko na pełne wykorzystanie elementów składowych, ale także na zmniejszenie kosztów magazynowych (związanych z przechowywaniem zapasów) jeśli zamawianie części zamiennych da się powiązać z trafnym prognozowaniem uszkodzeń. Większość istniejących modeli i teorii predykcji degradacji lub uszkodzeń opiera się na danych populacyjnych o uszkodzeniach lub zawieszeniu pracy co oznacza, że czas uszkodzenia komponentu przewiduje się w odniesieniu do historii uszkodzeń lub zawieszeń pracy tego samego typu lub podobnego typu elementów składowych. Jednak w praktyce zdarza się, że dla niektórych komponentów nie istnieją historie uszkodzeń lub zawieszenia pracy, do których można by się odnieść; jedyne co można wykorzystać to zgromadzone dotychczas sygnały z monitorowania stanu. W takim przypadku, trudno jest ocenić dokładnie czas i prawdopodobieństwo wystąpienia uszkodzenia. W niniejszej pracy, przedstawiono nowatorskie podejście do przewidywania degradacji. Opracowano nową funkcję szacowania prawdopodobieństwa uszkodzenia opartą na jednoczesnym wykorzystaniu "czasu pracy" oraz "stopnia degradacji" komponentu. Następnie wspólnie zoptymalizowano procesy wymiany i zamawiania części zamiennych zgodnie z szacowanym prawdopodobieństwem wystąpienia uszkodzenia. Celem optymalizacji była minimalizacja długoterminowego wskaźnika kosztów . Poprawność proponowanego podejścia zweryfikowano z wykorzystaniem dwóch zbiorów danych dotyczących łożysk.
    Źródło:
    Eksploatacja i Niezawodność; 2017, 19, 1; 76-85
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intelligent decision system based on the evidential reasoning approach and its applications
    Autorzy:
    Xu, D. L.
    Yang, J. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/308996.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    multicriteria decision support systems
    knowledge management
    intelligent decision system
    evidential reasoning approach
    Opis:
    Intelligent decision system (IDS) is a window-based software package that has been developed on the basis of the evidential reasoning (ER) approach, a recent development in handling hybrid multiple criteria decision analysis (MCDA) problems with uncertainties. In this paper, the evidential reasoning approach will be briefly described first, and its major differences from and the relationships with conventional MCDA methods will also be discussed. Then the main features, advantages and benefits of IDS will be demonstrated and explained using two application examples: supplier pre-qualification assessment and customer satisfaction survey analysis, which have been investigated as part of the research projects led by the authors and funded by the UK government and the EC. It is concluded in the paper that the ER approach can be used not only to deal with problems that traditional methods can solve, but also to model and analyse more complicated decision problems that traditional methods are incapable of handling.
    Źródło:
    Journal of Telecommunications and Information Technology; 2005, 3; 73-80
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inverse Problem of Textile Material Design at Low Temperature Solved by a Hybrid Stochastic Algorithm
    Rozwiązanie problemu inwersyjnego projektowania materiałów włókienniczych stosowanych w niskich temperaturach za pomocą hybrydowego algorytmu stochastycznego
    Autorzy:
    Weng, M
    Xu, D
    Zhou, X
    Powiązania:
    https://bibliotekanauki.pl/articles/232769.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    inverse problem
    textile design
    hybrid stochastic algorithm
    optimisation method
    problem inwersyjny
    projektowanie tkanin
    hybrydowy algorytm stochastyczny
    metody optymalizacji
    Opis:
    The inverse problem of textile material design (IPTMD) aims to determine textile materials with optimum thermal conductivities for the thickness designed in terms of the thermal comfort requirements of the wearer. In this paper, an IPTMD is presented on the basis of the physical nature of steady heat and moisture transfer in a human body-clothing-environment system. A globally convergent algorithm, the modified particle collision algorithm (MPCA), is proposed and its validity is verified. The MPCA is applied to solve the IPTMD for single-layer textile materials at low temperature. Numerical simulation results of the IPTMD proved the suitability of the IPTMD and effectiveness of the MPCA in solving complex global optimisation problems. The encouraging results indicate that the modelling method above and optimisation algorithm can be used for further applications.
    Problem inwersyjny projektowania materiałów włókienniczych ma na celu określenie materiałów włókienniczych z optymalną przewodnością cieplną dla grubości zaprojektowanej z uwzględnieniem komfortu termicznego i wygody użytkownika. W pracy przedstawiono problem na podstawie stałego przepływu ciepła i wilgotności pomiędzy ciałem człowieka, odzieżą a środowiskiem zewnętrznym. Zaprezentowano i zweryfikowano prawidłowość algorytmu zbieżnego, algorytmu zderzenia cząstek modyfikowanych, który jest stosowany w celu rozwiązania problemu dla jednowarstwowych materiałów włókienniczych w niskich temperaturach. Wyniki symulacji numerycznych problemu dowodzą jego przydatności i skuteczności algorytmu w rozwiązywaniu złożonych problemów optymalizacji. Zachęcające rezultaty wskazują, że powyższy sposób modelowania i algorytm optymalizacji mogą być używane do różnych zastosowań.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 2 (110); 40-43
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear actuator fault estimation observer: an inverse system approach via a T-S fuzzy model
    Autorzy:
    Xu, D.
    Jiang, B.
    Shi, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/331464.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    model rozmyty Takagi-Sugeno
    obserwator ślizgowy
    system odwrotny
    actuator fault estimation
    Takagi-Sugeno fuzzy models
    robust sliding mode observer
    inverse system method
    Opis:
    Based on a Takagi-Sugeno (T-S) fuzzy model and an inverse system method, this paper deals with the problem of actuator fault estimation for a class of nonlinear dynamic systems. Two different estimation strategies are developed. Firstly, T-S fuzzy models are used to describe nonlinear dynamic systems with an actuator fault. Then, a robust sliding mode observer is designed based on a T-S fuzzy model, and an inverse system method is used to estimate the actuator fault. Next, the second fault estimation strategy is developed. Compared with some existing techniques, such as adaptive and sliding mode methods, the one presented in this paper is easier to be implemented in practice. Finally, two numerical examples are given to demonstrate the efficiency of the proposed techniques.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 183-196
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    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:
    Double tunneling induced transparency in the asymmetry quantum dot molecules
    Autorzy:
    Yu, C.
    Huang, H.
    Zhang, L.
    Xu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/173599.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quantum dot molecule
    slow light
    tunneling induced transparency
    Opis:
    Using the density matrix theory, we have studied the double tunneling induced transparency slow light in the double asymmetry quantum dot molecules. With applied electric field, double tunneling induced transparency occur in the same time. Four absorption peaks are found near the resonance energy level in the absorption spectrum and the absorption peak can be tuned by the applied electric field. The velocity and bandwidth of the multiple-windows slow light can also be controlled by the applied electric field. In our model, with Te =0.1meV, we can get about 0.001c and 20GHz bandwidth in each transparency window. Such a property may be applied in all optical buffers, optical switching and filter.
    Źródło:
    Optica Applicata; 2016, 46, 3; 473-481
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mineralizacja polimetaliczna z kopalni Beiyi w okręgu rud żelaza Shilu na wyspie Hajnan w południowych Chinach
    The polymetallic mineralization from the Beiyi mine, Shilu iron ores district, Hainan Island (Southern China)
    Autorzy:
    Mikulski, S.Z.
    Bakun-Czubarow, N.
    Xu, D.
    Wang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2062063.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    kruszce
    rudy siarczkowe miedzi i kobaltu
    rudy żelaza
    amalgamat Ag-Hg
    analizy w mikroobszarze
    kopalnia Beiyi
    złoże Shilu
    Wyspa Hajnan
    Chiny
    ore mineralogy
    ores
    copper-cobalt sulfides
    iron oxide
    Ag-Hg amalgamate
    microprobe analyses
    Beiyi mine
    Shilu deposit
    Hainan Island
    China
    Opis:
    W regionie górniczym Shilu posiadającym olbrzymie zasoby rud żelaza typu BIF (Banded Iron Formation), oprócz mineralizacji tlenkami Fe (głównie hematyt), występuje lokalnie w spągu 6 poziomu stratygraficznego grupy Shilu, bogata polimetaliczna mineralizacja siarczkowa Cu–Co. W regionie górniczym Shilu występują słabo zmetamorfizowane skały wulkanoklastyczne i węglanowe zaliczane do mezo- i neoproterozoiku, w które intrudowały różnego wieku granitoidy. Przedmiotem badań mikroskopowych w świetle odbitym i w mikroskopie elektronowym CAMECA SX 100, wyposażonym w przystawkę EDS i WDS, była polimetaliczna mineralizacja kruszcowa z kopalni Beiyi i jej okolic. Mineralizacja kruszcowa, głównie pirotynowo-chalkopirytowa oraz kobaltonośny piryt (do ok. 11% wag. Co), występuje w zmienionych skałach węglanowo-krzemianowych i silnie okwarcowanych skałach diopsydowo-tremolitowych w postaci impregnacji, żyłek i masywnych agregatów ziarnistych. Pirotyn i chalkopiryt zawierają liczne wrostki oraz tworzą przerosty z innymi minerałami (sfaleryt, galena, glaukodot, costibit, kobaltyn, arsenopiryt, ullmannit, siegenit, tytanit, Co-bravoit i kasyteryt). Niewielkie kryształy (10–20 μm średnicy) tworzą minerały Bi (matyldyt i cosalit) i argentyt. W paragenezie z barytem, kalcytem i chlorytem pojawiają się amalgamaty Ag–Hg oraz cynober. Wyniki prac pozwoliły rozpoznać nowe, dotychczas nieopisywane ze złoża minerały. Rezultaty badań wskazują na krystalizację minerałów kruszcowych podczas 4–5 oddzielnych etapów precypitacji kruszców z roztworów hydrotermalnych, w zakresie od temperatur średnich do niskich. Wstępne wyniki oznaczeń wieku izotopowego metodą Re–Os młodszej generacji pirytów (pozbawionych domieszek kobaltu) wskazują na ich precypitację w interwale 240–260 mln lat.
    The famous Shilu iron-polymetallic ore mining district located in western Hainan Island, South China, occurs within Meso- and Neoproterozoic low-grade metamorphosed volcanoclastics and carbonates, that belong to the 6th sequence of the Shilu Group. Granitoid intrusions of different ages occur in the surroundings of the mining area. The Shilu deposit is considered to be a structurally reworked as well as hydrothermally altered and enriched ore deposit of a Banded Iron Formation type. The deposit is a very important iron producer from hematite (and minor magnetite) ores. Our work focused on the polymetallic sulfide mineralization that underlies the iron oxide ores. We selected several samples of sulfide ores from the Shilu deposit of the Beiyi mine and its close vicinity. We performed detailed ore microscopic studies as well as electron microprobe analyses using the CAMECA SX 100 equipped with EDS and WDS systems. Pyrrhotite, chalcopyrite and Co-bearing pyrite (up to 11 wt% Co) dominated among ore sulfides in the studied samples. These ore minerals occur in calc-silicate rocks and strongly silicified diopside, tremolite-bearing rocks, either as disseminated grains, sometimes in veinlets, or in aggregates that may form massive ores. Pyrrhotite and chalcopyrite may contain numerous solid inclusions, overgrowths and intergrowths of subordinate sulfides (sphalerite, galena), sulfosalts (glaucodot, costibite, cobaltite, arsenopyrite, ullmannite), sulfospinels (siegenite) and cassiterite that belong to the minerals crystallizing at medium to low temperatures. Among these minerals, siegenite and Co-bravoite dominate. Tiny crystals (10–20 μm in size) of Bi-minerals (matildite, cosalite) and argentite are also present. Moreover, in association with barite, calcite and chlorite, Ag-Hg amalgamate and cinnabar can occur. The results of our study point to the multistage medium- to low-temperature hydrothermal precipitation of ore sulfides during 4–5 separate stages. Preliminary results of Re-Os isotope datings indicate that pyrites of younger generation (lack of significant Co admixture) crystallized during 240–260 Ma.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2012, 452; 181--197
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the influence of the transducer and its coupling layer on round window stimulation
    Autorzy:
    Liu, H.
    Xu, D.
    Yang, J.
    Yang, S.
    Cheng, G.
    Huang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/306655.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    słuch
    stymulacja
    przetwornik
    RW
    FEM
    implantable middle ear hearing device
    round window stimulation
    transducer
    coupling layer
    finite element analysis
    Opis:
    Purpose: In this work, a finite element study is proposed to evaluate the effects of the transducer and its coupling layer on the performance of round window (RW) stimulation. Methods: Based on a set of micro-computer tomography images of a healthy adult’s right ear and reverse engineering technique, a coupled finite-element model of the human ear and the transducer was constructed and verified. Then, the effect of the cross-section of the transducer, the elastic modulus of the coupling layer, the mass of the transducer, and the preload of the transducer were studied. Results: The increase of the transducer’s cross-section area deteriorates the RW stimulation, especially at the lower frequencies. This adverse effect of the cross-section area’s increase of the transducer can be reduced by adding a coupling layer between the transducer and the RW. However, the coupling layer’s improvement on the RW stimulation is reduced with the increase of its elastic modulus. Moreover, the mass loading of the transducer decreases the RW stimulation’s performance mainly at higher frequencies and applying a static preload on the transducer enhances its hearing compensating performance at higher frequencies. Conclusions: The influence of the transducer’s mass, the mass of the transducer, the applied static preload and the properties of the coupling layer must be taken into account in the design of the RW stimulation type implantable middle ear hearing device.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 2; 103-111
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of organohalogens in foodstuffs and environmental samples by neutron activation analysis and related techniques
    Autorzy:
    Xu, D.
    Chai, Z.
    Zhang, H.
    Mao, X.
    Ouyang, H.
    Sun, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/147259.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    instrumental neutron activation analysis (INAA)
    pine needle
    foodstuff
    extractable organohalogen
    Opis:
    Pine needles and foodstuffs collected from Beijing, China, were analyzed by instrumental neutron activation analysis (INAA) combined with organic solvent extraction for total halogens, extractable organohalogens (EOX) and extractable persistent organohalogens (EPOX). The INAA detection limits are 50 ng, 8 ng and 3.5 ng for Cl, Br and I, respectively. The contents and distribution patterns of organohalogens in these samples are reported. EOCl accounted for 0.013 0.016% and 1.6 2.7% of the total chlorine in yogurt and apples, respectively, which suggested that chlorine in foodstuffs mainly existed as inorganic species and non-extractable organochlorines. EOCl contents in pine needles and foodstuffs were noticeably higher than those of EOBr and EOI. For pine needles, yogurt and apples, 1.6 34%, 23 58% and 29 35% of EOCl remained as extractable persistent organochlorine (EPOCl), respectively. Pine needle containing higher EOCl contents in chemical industrial and traffic hub areas indicated that chemical industries and exhaust emission from vehicle were the main sources of organochlorines in the Beijing's air. The relative proportions of the known organochlorines (such as HCHs, DDTs, chlordanes, heptachlor, HCB and PCBs) to the total EOCl and EPOCl were 0.04 1.6% and 0.7 21.5%, respectively, which implied that the identity of species of a major portion of the EOCl and EPOCl measured in pine needles was unknown.
    Źródło:
    Nukleonika; 2004, 49, 3; 101-106
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of paclobutrazol on the growth and photosynthesis of Sequoia sempervirens seedlings
    Autorzy:
    Ju, S.
    Xu, D.
    Zhan, C.
    Ji, L.
    Yin, T.
    Li, Z.
    Lu, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    paclobutrazol
    plant growth regulator
    photosynthetic activity
    Sequoia sempervirens
    seedling
    morphological index
    chlorophyll fluorescence
    environmental stress
    Źródło:
    Journal of Horticultural Research; 2019, 27, 1
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global convergence analysis of impulsive fractional order difference systems
    Autorzy:
    He, D.
    Xu, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/200405.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impulsive fractional difference systems
    discrete Mittag-Leffler function
    Z-transform
    convergence
    konwergencja
    funkcja Mittag-Lefflera
    transformacja Z
    Opis:
    This paper is designed to deal with the convergence and stability analysis of impulsive Caputo fractional order difference systems. Using the Lyapunov functions, the Z-transforms of Caputo difference operators, and the properties of discrete Mittag-Leffler functions, some effective criteria are derived to guarantee the global convergence and the exponential stability of the addressed systems.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 599-604
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study of the Explosion of Aluminized Explosives in Air
    Autorzy:
    Chen, Y.
    Xu, S.
    Wu, D. J.
    Liu, D. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/358676.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    explosion in air
    aluminized explosives
    boron powders
    TNT equivalence
    fireballs
    Opis:
    Piezoelectric gauges were used to measure the shock wave overpressure of aluminized explosives and of a TNT charge. An infrared thermal-imaging spectrometer was used to collect the infrared signatures produced by the explosion fireball when the examined explosives were detonated. The measurement of the infrared signatures was used to estimate the surface temperatures and the dimensions of the fireball. Two aluminized explosive compositions (RDX/Al/AP and RDX/Al/B/AP) have been analyzed. 500 g charges of the aluminized explosives were prepared and studied, and their TNT equivalences were calculated according to the experimental data and the explosion law. The highest surface temperatures of the fireballs of these aluminized explosives were up to 1600 °C, which was higher than that of the TNT charge. In the region of the highest surface temperature above 700 °C, the duration for the composition RDX/Al/AP was about 232 ms (2.73 times more than TNT), whilst RDX/Al/B/AP was about 360 ms. The fireballs obtained from the explosion of these aluminized explosives had larger dimensions than that of TNT, especially when the surface temperature was above 1000 °C. The test results indicate that the addition of boron powders to aluminized explosives is a good way to enhance their blast effect, to improve the temperature of the explosion field and to prolong the duration of the higher temperature.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 1; 117-134
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of application of attapulgite on the structure and composition of self-dynamic membrane in bioreactors
    Autorzy:
    Duan, W.
    Ling, C.
    Fu, D.
    Xu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/207004.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bioconversion
    electrophoresis
    polymerase chain reaction
    porosity
    bioreactor system
    DGGE
    extracellular polymeric substances
    biokonwersja
    elektroforeza
    reakcja łańcuchowa polimerazy
    porowatość
    system bioreaktorów
    zewnątrzkomórkowe substancje polimerowe
    Opis:
    The effect of application of attapulgite on the structure and composition of a dynamic membrane (DM) of a bioreactor was investigated by means of the electron microscopy, polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE). A significant increase of microbial floc size in the bioreactors upon attapulgite application was observed. The content of cake layer in the hybrid dynamic membrane (HDM) and in the dynamic membrane (DM) in the corresponding bioreactor systems were 44.73 g/m2 and 38.12 g/m2 respectively, while the contents of mineral – 6.09 g/m2 and 5.34 g/m2, respectively. Further, with addition of attapulgite, the concentration of extracellular polymeric substances (EPS) in the HDM bioreactor system decreased, whereas the content of suspended particulate matter increased. Self-DM has a porous structure with high porosity. Mineral sub-stance, including O, Ka, Ca, P, S, Cl, Mg and Si, are the main elements in DM, but the main elements content exhibited an increase trend in DM with attapulgite administration. These results showed a positive correlation between the quantity of bacterial populations and biological removal improvement, which indicated that application of attapulgite could optimize the structure of self-DM in bioreactors.
    Źródło:
    Environment Protection Engineering; 2016, 42, 2; 171-182
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of finite element meshing accuracy on a welding machine for offshore platform’s modal analysis
    Autorzy:
    Xie, J.
    Sun, D.
    Xu, C.
    Wu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/260126.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    finite element analysis
    meshing
    meshing accuracy
    modal analysis
    Opis:
    The purpose objective of this study was to investigate the influence of finite element meshing accuracy on modal analysis which is one of the basic factors affecting the accuracy of finite element analysis and mostly preoccupies the working staff in pre-processing finite element simulation models. In this paper, we established several finite element models of a welding machine for offshore platform, with the meshing accuracy as the variable and workbench software as the platform for modal analysis, as the same time, comparing the analysis results. The results indicated that for some specific structures and simulation types, mesh refinement alone does not achieve desired results, and the authors indicate that mesh refinement is rarely related to the equipment’s low-frequency modal analysis but it’s great related to the equipment’s high-frequency modal analysis. The findings of this study may serve as breaking the opinion that smaller mesh size means higher calculation precision and provides references for mesh division practices in low frequency modal analysis.
    Źródło:
    Polish Maritime Research; 2018, S 3; 147-153
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extended Lie algebraic stability analysis for switched systems with continuous-time and discrete–time subsystems
    Autorzy:
    Zhai, G.
    Xu, X.
    Lin, H.
    Liu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/929816.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    układ komutowany
    funkcja Lapunowa
    algebra Lie'go
    stateczność wykładnicza
    switched systems
    common quadratic Lyapunov functions
    Lie algebra
    exponential stability
    arbitrary switching
    dwell time scheme
    Opis:
    We analyze stability for switched systems which are composed of both continuous-time and discrete-time subsystems. By considering a Lie algebra generated by all subsystem matrices, we show that if all subsystems are Hurwitz/Schur stable and this Lie algebra is solvable, then there is a common quadratic Lyapunov function for all subsystems and thus the switched system is exponentially stable under arbitrary switching. When not all subsystems are stable and the same Lie algebra is solvable, we show that there is a common quadratic Lyapunov-like function for all subsystems and the switched system is exponentially stable under a dwell time scheme. Two numerical examples are provided to demonstrate the result.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2007, 17, 4; 447-454
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nondestructive Evaluation of Rubber Composites Using Terahertz Time Domain Spectroscopy
    Niedestrukcyjna metoda oceny kompozytów kauczukowych przy użyciu spektroskopii z wykorzystaniem technologii wykrywania terahercowego
    Autorzy:
    Xu, F.
    Duan Mu, Q. D.
    Li, L. J.
    Yang, D.
    Xia, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/232361.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    terahertz imaging
    rubber composites
    nondestructive testing
    defects
    wykrywanie terahercowe
    materiały gumowe
    badania nieniszczące
    defect gumy
    Opis:
    In recent years, with the progress of science, more and more detection methods are being used in various fields. However, the nondestructive testing of nonmetallic materials still needs further study. In this paper, an analysis of the time domain characteristics of rubber materials using terahertz detection technology was carried out, obtaining different defect rubber material spectral characteristics as well as imaging results and data. The results show that the THz spectrum imaging technique can detect the thickness of rubber material in the 0.1 ~ 4.0 terahertz band, and the image is clear and the resolution high. Meanwhile the time domain waveform obtained is sensitive to the debonding defects of the sample rubber, is suitable for judging the overall performance of the rubber inner defect detection, and can provide the scientific basis for rubber material performance.
    W artykule przedstawiono analizę charakterystyk materiałów gumowych z wykorzystaniem technologii wykrywania terahercowego, uzyskując różne charakterystyki spektralne defektów gumy, a także wyniki i dane obrazowe. Wyniki pokazały, że technika obrazowania widma THz może wykrywać grubość materiału gumowego w paśmie 0,1 ~ 4,0 terahercowym, a obraz jest wyraźny i ma wysoka rozdzielczość. W międzyczasie otrzymany przebieg domeny czasu jest wrażliwy na defekty badanej gumy, jest odpowiedni do oceny ogólnej wydajności wykrywania wewnętrznego defektu gumy i może zapewnić podstawy dla oceny właściwości materiału gumowego.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 1 (127); 67-72
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An ant-based filtering random-finite-set approach to simultaneous localization and mapping
    Autorzy:
    Li, D.
    Zhu, J.
    Xu, B.
    Lu, M.
    Li, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/329854.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    simultaneous localization
    simultaneous mapping
    random finite set
    probability hypothesis density
    ant colony
    lokalizacja jednoczesna
    mapowanie jednoczesne
    algorytm mrówkowy
    Opis:
    Inspired by ant foraging, as well as modeling of the feature map and measurements as random finite sets, a novel formulation in an ant colony framework is proposed to jointly estimate the map and the vehicle trajectory so as to solve a feature-based simultaneous localization and mapping (SLAM) problem. This so-called ant-PHD-SLAM algorithm allows decomposing the recursion for the joint map-trajectory posterior density into a jointly propagated posterior density of the vehicle trajectory and the posterior density of the feature map conditioned on the vehicle trajectory. More specifically, an ant-PHD filter is proposed to jointly estimate the number of map features and their locations, namely, using the powerful search ability and collective cooperation of ants to complete the PHD-SLAM filter time prediction and data update process. Meanwhile, a novel fast moving ant estimator (F-MAE) is utilized to estimate the maneuvering vehicle trajectory. Evaluation and comparison using several numerical examples show a performance improvement over recently reported approaches. Moreover, the experimental results based on the robot operation system (ROS) platform validate the consistency with the results obtained from numerical simulations.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2018, 28, 3; 505-519
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infuence of Iron Ion on Thermal Behavior of Ammonium Nitrate and Emulsion Explosives
    Autorzy:
    Xu, Z.
    Liu, D.
    Hu, Y.
    Ye, Z.
    Wei, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/357932.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    Accelerating Rate Calorimeter (ARC)
    ammonium nitrate
    critical temperature
    emulsion explosives
    thermal stability
    Opis:
    The infuence of ferric nitrate on the thermal stability of ammonium nitrate and emulsion matrix were used to study with Accelerating Rate Calorimeter (ARC) and constant temperature thermal decomposition experiment in this paper. It is shown that ferric nitrate has signifcant catalytic property to the ammonium nitrate and emulsion matrix, which decrease the initial decomposition temperature of ammonium nitrate by 60.16 C and emulsion matrix by 30.33 C. The results of the infuence of ferric nitrate on catalysis of ammonium nitrate using ARC and constant temperature thermal decomposition experiment are the same. The most probable mechanism function, activation energy and the preexponential factor of ammonium nitrate with ferric nitrate were determined to be f(α) = 1-α, E = 195.41 kJ/mol, A = 2.08×1019 s-1. The kinetics of ammonium nitrate decomposition can be used to calculate the critical temperatures for ammonium nitrate decomposition with and without the presence of ferric nitrate, based on the Frank-Kamenetskii model of thermal explosion. Furthermore, as the iron-plate experiment shows, ferric nitrate can signifcantly reduce the critical temperature of emulsion matrix decomposition. Once the ferric nitrate interfuses in the ammonium nitrate and emulsion matrix, the thermal stability of ammonium nitrate and emulsion matrix is decreasing.
    Źródło:
    Central European Journal of Energetic Materials; 2010, 7, 1; 77-93
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time Resolved IR and X-Ray Simultaneous Spectroscopy: New Opportunities for the Analysis of Fast Chemical-Physical Phenomena in Materials Science
    Autorzy:
    Marcelli, A.
    Hampai, D.
    Xu, Wei
    Malfatti, L.
    Innocenzi, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808498.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.Qe
    61.05.cj
    82.20.-w
    78.47.-p
    Opis:
    New powerful sources and advanced analytical techniques have been considered in the last decade to face up the continuously increasing scientific demands, in particular, in materials science. As an example, nano- science and nanotechnology researches are characterized by ultimate spatial resolution, fast and ultrafast time-resolved analysis, but the complexity of the investigated phenomena requires new analytical capabilities and new experimental techniques were introduced in the research arena. The availability all over the world of brilliant synchrotron radiation sources offers incredible opportunities. Many challenging experiments were made possible by these sources and understanding of many complex dynamical problems was obtained. Nevertheless, a strong demand of new analytical approaches, mainly based on concurrent and possibly simultaneous time-resolved experimental techniques, is emerging. Pioneering time resolved experiments combining X-ray and infrared radiation with a conventional source were performed more than a decade ago. Nowadays, many beamlines at third generation synchrotron radiation facilities are equipped with conventional sources to allow complementary techniques and the strategy of a concurrent analysis is mandatory in the investigation of many phenomena in frontier multidisciplinary researches. Moreover, new opportunities will be available by means of concurrent spectroscopic experiments investigating complex phenomena on a short timescale, from the sub-second to the microsecond time domain. We will present and discuss researches where the combination of IR and X-ray simultaneous experiments may return unique information on complex dynamical processes and phase transitions occurring in materials science. Finally, we will briefly describe the conceptual layout of a synchrotron radiation beamline to perform concurrent IR and X-ray experiments.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 489-500
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Marine Traffic Real-Time Safety Index
    Autorzy:
    Xu, T.
    Hu, Q. Y.
    Xiang, Z.
    Wang, D. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/116195.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Vessel Traffic
    safety at sea
    Marine Traffic
    Marine Traffic Real-Time Safety Index
    Real Time
    Real-Time Safety Index
    Automatic Identification System (AIS)
    Waigaoqiao Channel
    Opis:
    To reflect the safety degree of marine traffic in real-time and intuitively, this paper put forward a concept of real-time safety index of marine traffic, established marine traffic real-time safety index system, and constructed a real-time safety index evaluation model by using vessel traffic and navigation environmental data provided by shore-based AIS base station network, and quantifying a variety of data which impacts the safety of marine traffic such as ships’ real-time dynamic data, weather changes and so on. A continuous real-time evaluation to a specific area was carried out in the form of real-time index curve, taking the Waigaoqiao Channel of Port Shanghai as an example, to verify the feasibility and effectiveness of marine traffic real-time safety index.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8 no. 4; 599-603
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Comparison Study on AIS Signal Reception Rate with Directional Antenna and Omni Antenna
    Autorzy:
    Xu, T.
    Hu, Q.
    Xiang, Z.
    Yang, C.
    Wang, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/116436.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Automatic Identification System (AIS)
    AIS Signal
    AIS Data
    Yagi antenna
    Omni antenna
    Directional Antenna
    reception rate
    VHF Technology
    Opis:
    With the wide use of AIS system in the world, especially in ports and the waters with heavy traffic, AIS message loss may be related to environmental conditions, obstacle, limitation of VHF technology and AIS network overload, thereby reducing the AIS signal successful reception rate. This paper selected typical AIS data received by Yagi and Omni antennas at the same time in specific waters, uses grid and AIS data recovery technology, establishes the AIS signal coverage model, analyzes signal reception rate of Yagi antenna and Omni antenna of AIS base station, and verified the superiority of Yagi antenna in AIS signal reception rate.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 2; 205-211
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of boron on ZSM-5 catalyst for methanol to propylene conversion
    Autorzy:
    Xu, A.
    Ma, H.
    Zhang, H.
    Ying, W.
    Fang, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/777971.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    methanol to propylene
    ZSM-5
    boron modifi cation
    propylene
    Opis:
    B-ZSM-5 catalysts were prepared by various modification methods with boric acid, including ion-exchange, impregnation and direct synthesis. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), NH3-Temperature Programmed Desorption (NH3-TPD), N2 adsorption-desorption, Fourier Transform Infrared spectrometry (FT-IR), 27Al and 11B MAS NMR spectra. The results revealed that the weak acidity of catalysts was significantly increased by modification. The catalytic activity was measured in a fixed bed at 460°C for methanol to propylene (MTP) reaction. The results of MTP reaction showed a great increment of the propylene selectivity for the boron modified samples, especially for the directly synthesized B-ZSM-5 which also displayed high activity and selectivity towards C2 =-C4 = olefins. It was found that the remarkable selectivity strongly depended on the intensity of weak acidity.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 4; 95-101
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An articulated pes from a small parvicursorine alvarezsauroid dinosaur from Inner Mongolia, China
    Autorzy:
    Hone, D.W.E.
    Choiniere, J.N.
    Tan, Q.
    Xu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/21549.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    Dinosauria
    Theropoda
    maniraptoran
    arctometatarsalian organism
    Cretaceous
    Inner Mongolia
    alvarezsauroid dinosaur
    dinosaur
    China
    Opis:
    A near complete and articulated parvicursorine pes from the Campanian Wulansuhai Formation is described. This pes is referred to the genus Linhenykus and is one of the first foot skeletons to be described for a derived alvarezsaur, providing new information on the first digit of the pes. The evolution of a laterally directed flange of the anterior face of the distal third metatarsal in arctometatarsalian taxa is described and discussed. This flange may have increased stability of the foot during cursorial locomotion and may also provide useful taxonomic and systematic data.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of overlying water pH, dissolved oxygen and temperature on heavy metal release from river sediments under laboratory conditions
    Autorzy:
    Huang, Y.
    Zhang, D.
    Xu, Z.
    Yuan, S.
    Li, Y.
    Wang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/204852.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heavy metal
    release
    river sediment
    Opis:
    The heavy metal release experiments were conducted in the laboratory to examine the effects of 3 factors - pH, dissolved oxygen (DO), and temperature on the metal release from sediments taken from the Huangpu River. The metal concentrations in the dry sediments ranged from 0.030 to 0.296 mg g-1 for Cr, 0.021 to 0.097 mg g-1 for Ni, 0.014 to 0.219 mg g-1 for Cu, 0.035 mg to 0.521 mg g-1 for Zn, 0.0002 to 0.001 mg g-1 for Cd and 0.023 to 0.089 mg g-1 for Pb. Most of the metals found in the sediments were in the form of residual fraction, the exchangeable fraction consisted of only a small portion of total metals. The average dissolved metal concentrations in the overlying water during the 13-day period under different conditions were ranging from 0.82 to 1.93 μg L-1 for Cr, 1.08 to 4.19 μg L-1 for Ni, 40.79 to 82.28 μg L-1 for Cu, 20.30 to 29.96 μg L-1 for Zn, 1.57 to 4.07 μg L-1 for Cd, and 22.26 to 75.50 μg L-1 for Pb, respectively. Statistical interpretation of the data indicated that pH (7, 8, 9), dissolved oxygen DO (1.0 and 5.0 mg L-1) and temperature (4, 16, 25°C) had no significant effects on the heavy metal release under the studied conditions. Cu and Pb had the highest release flux, while Cd, Pb and Cu had higher mobility. The main factors controlling the metals release might be the inherent characters of metals and sediments.
    Źródło:
    Archives of Environmental Protection; 2017, 43, 2; 28-36
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Mg and Ca on the Characteristics of Inclusions in Sulphur Steel
    Autorzy:
    Tian, J.
    Qu, T.
    Wang, D.
    Wang, H.
    Xu, Z.
    Xinrui, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/355348.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg treatment
    Ca treatment
    MnS
    complex sulfide
    inclusions
    Opis:
    The effects of Mg and Ca on sulfide modification of sulphur steel were studied to elucidate the difference between micromagnesium treatment and micro-calcium treatment for the inclusion of sulphur steel. The results show that the inclusions in the steel appeared with an oxide core of Al2O3 and MnS wrapped. After the addition of Mg, the core was changed to spinel, and the MnS coating was changed to Mn-Mg-S. After Ca was added, the core was changed to Ca-Al-O, and the MnS coating was changed to Mn-Ca-S. The Mg content was higher than Ca content in the sulfides of the steel. Therefore, Mg was more effective than Ca in terms of sulfide modification with the same content of Mg and Ca in steel, but the yielding rate of Mg was lower than that of Ca. The Mg content in the oxide core was higher than Mg of the coating of the inclusions in the steel treated with Mg or Mg-Ca. In contrast, the Ca content in the oxide core was lower than Ca of the coating of the inclusions in the steel treated with Ca or Mg-Ca. MnS formed and precipitated during the melt solidification process. The complex sulfide (Mg-Mn-S) was precipitated around MgO·Al2O3 in the Mg treated steel during the cooling process. CaS inclusion was precipitated on the CaO·Al2O3 inclusions in the liquid Ca-treated steel. Thus, CaS was formed first, whereas MnS was formed during the cooling process, followed by the formation of complex sulfide (CaS+MnS), which finally precipitated around CaO·Al2O3 in the Ca-treated steel.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1599-1607
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Negative Pressure and Cleaning Condition Effects on Gathering for Ramie Compact Spinning with a Suction Groove
    Badanie podciśnienia i warunków czyszczenia na skupienie włókien ramii przy przędzeniu kompaktowym z rowkiem zasysającym
    Autorzy:
    Ma, H C
    Cheng, L. D.
    Yan, G X
    Xu, S P
    Powiązania:
    https://bibliotekanauki.pl/articles/232971.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    suction groove
    compact spinning
    ramie
    negative pressure
    hairiness index
    przędzenie kompaktowe
    ramia
    redukcja włochatości tkanin
    Opis:
    The application of the compact spinning technique with a suction groove could reduce the spinning triangle to a minimum and dramatically decrease the hairiness of ramie yarn. The change range of negative pressure was discussed when the hairiness index was reduced to a minimum for the best gathering effect. The relationship between the doffing time and hairiness index of compact yarn was studied. When the suction groove was not cleaned, the spinning times influenced the fibre number accumulated inside the suction groove. The cleaning suction groove made airflow run smoothly, and the gathering effect of fibres was basically unchanged; thus the hairiness index of yarn rarely fluctuated. For compact yarn compared with 100% 27.8 tex traditional ring-spun yarn, the 4 mm hairiness index and above decreases by more than 79.72%. The result shows that ramie compact spinning with a suction groove could gather edge fibres effectively and reduce harmful hairiness markedly.
    Zastosowanie przędzenia kompaktowego z rowkiem zasysającym pomogło zredukować trójkąt przędący i w ten sposób intensywnie zmniejszyć włochatość otrzymywanych przędz. Ustalono zakres stosowania podciśnienia dla uzyskania najlepszego efektu. Kiedy rowek zasysający nie był czyszczony, czas przędzenia wpływał na ilość włókien akumulowanych wewnątrz tego rowka. Czyszczenie rowka zasysającego powoduje, że powietrze przepływa równomiernie i efekt skupienia włókien pozostawał niezmieniony dzięki czemu indeks włochatości przędzy zmieniał się w małym stopniu. Wyniki pokazały, że kompaktowe przędzenie ramii z zastosowaniem rowka zasysającego pozwala skutecznie gromadzić skrajne włókna i redukować włochatość.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2014, 3 (105); 54-57
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scale effect of cement mortar specimens subjected to high temperatures using uniaxial compressive and splitting tensile tests
    Autorzy:
    Xiong, L. X.
    Zhang, X. J.
    Xu, Z. Y.
    Geng, D. X.
    Powiązania:
    https://bibliotekanauki.pl/articles/230921.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zaprawa cementowa
    temperatura wysoka
    ściskanie jednoosiowe
    rozciąganie przy rozłupywaniu
    efekt skali
    cement mortar
    high temperature
    uniaxial compression
    splitting tensile
    scale effect
    Opis:
    In this study, cubic and cylindrical cement mortar specimens were first subjected to high temperatures, then the cubic and cylindrical specimens were taken out and conducted with uniaxial compressive test and splitting tensile test, respectively. The effect of the length to side ratio on the uniaxial compressive properties and the effect of thickness-to-diameter ratio on the splitting tensile properties of cement mortar specimens after high temperature were studied. Test results show that: (1) With temperature increasing from 25 ºC (room temperature) to 400 ºC, the compressive strength and elastic modulus of cubic specimens with three kinds of side lengths decrease; the decreasing rates of compressive strength and elastic modulus of cubic specimen with side length of 70.7 mm is higher than those of cubic specimens with side length of 100 mm and 150 mm, and the strain at the peak stress of cubic specimens with three kinds of side lengths increase. (2) After the same temperature, the tensile strength of cylindrical specimen decreases with the thickness-to-diameter ratio increasing from 0.5 to 1.0. The decreasing rate of tensile strength of cylindrical specimen with thickness-to-diameter ratio is highest when the temperature is 25 ºC (room temperature), followed by that after the temperature of 200 ºC, and that after the temperature of 400 ºC is the lowest.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 139-155
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Lifting Wavelet Domain Audio Watermarking Algorithm Based on the Statistical Characteristics of Sub-Band Coefficients
    Autorzy:
    Tao, Z.
    Zhao, H.
    Wu, J.
    Gu, J.
    Xu, Y.
    Wu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/177956.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    audio watermarking
    lifting wavelet transform
    statistical characteristics
    sub-band coefficients
    Opis:
    In this paper, a new lifting wavelet domain audio watermarking algorithm based on the statistical characteristics of sub-band coefficients is proposed. First of all, an original audio signal was segmented and each segment was divided into two sections. Then, the Barker code was used for synchronization, the LWT (lifting wavelet transform) was performed on each section, a synchronization code and a watermark were embedded into the first section and the second section, respectively, by modifying the statistical average value of the sub-band coefficients. The embed strength was determined adaptively according to the auditory masking property. Experiments show that the embedded watermark has better robustness against common signal processing attacks than present algorithms based on LWT and can resist random cropping in particular.
    Źródło:
    Archives of Acoustics; 2010, 35, 4; 481-491
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isolation and genetic analysis of a variant porcine epidemic diarrhea virus in China
    Autorzy:
    Li, R.-f.
    Tian, X.-g.
    Liu, Y.
    Xu, J.
    Liu, D.-y.
    Powiązania:
    https://bibliotekanauki.pl/articles/30492.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Porcine epidemic diarrhea virus (PEDV) is having a severe effect on the pig breeding industry in central China. The mucosa and the content of the small intestine from newborn pre-weaned piglets with diarrhea were tested for the presence of PEDV by molecular and morphologic methods, and found to be positive. Negative-staining electron microscopy (EM) revealed the presence of coronavirus- like particles in the samples. The result of molecular detection by nested RT-PCR based on the amplification of the M gene was positive. Using a novel alternative method we successfully propagated the PEDV strain (CH/QX-2) in Vero cells, confirmed by ultrathin sections of the cells and Immunofluorescence assay (IFA). Phylogenetic analysis based on the partial S gene showed that the CH/QX-2 isolate was genetically closer to strains more commonly found in China, but differed genetically from two domestic strains (CH/S, 1986 and LZC, 2007), Korean strains (DR13, 2007), and the vaccine strain (CV777 vs) currently being used in China. CH/QX-2 formed a unique clade in the derived phylogenetic tree indicating that the CH/QX-2 strain currently circulating in central China is a new variant of PEDV. This study extends current knowledge on the diversity and epidemiology of PEDV.
    Źródło:
    Polish Journal of Veterinary Sciences; 2016, 19, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Abundance and community structure of ammonia oxidizing archaea and bacteria in response to peanut growth under controlled condition in Shandong, China
    Autorzy:
    Huang, C.
    Xu, N.
    Fu, Z.
    Sun, B.
    You, S.
    Ma, D.
    Yu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/12689395.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    China
    plant cultivation
    peanut
    Arachis hypogaea
    plant growth
    community structure
    microorganism abundance
    ammonia-oxidizing bacteria
    ammonia-oxidizing archaea
    field experiment
    three-year field experiment
    controlled condition
    Opis:
    Based on a three-year field experiment under controlled condition in Ji’nan, China, the effects of peanut growth on the variation in the abundance and community structure of ammonia oxidizing bacteria (AOB) and archaea (AOA) before and after peanut growth were investigated through quantitative PCR and cluster analysis of terminal-restriction fragment length polymorphism. Our results show that the community composition of AOA and AOB was greatly affected by the peanut growth leading to the decreased abundance of AOA and increased abundance of AOB. Furthermore, AOA and AOB community structures varied before and after peanut growth. Phylogenetic analysis indicated that all AOA and AOB community sequences were clustered into the uncultured group. Altogether, the results suggested that the abundance of AOA and AOB in soil and their community compositions can be greatly affected by the peanut growth.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 6; 119-127
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular cloning, expression, purification and osteoblasts proliferation activity of sika deer thymosin beta10
    Autorzy:
    Zhao, D.
    Zhao, Y.
    Zhang, H.
    Xu, Z.
    Liu, M.
    Wang, J.
    Bai, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087874.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    affinity chromatography
    cell proliferation
    prokaryotic expression
    sika deer
    thymosin 10
    Źródło:
    Polish Journal of Veterinary Sciences; 2017, 4; 751-758
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acer truncatum seedlings are more plastic than Quercus variabilis seedlings in response to different light regimes
    Autorzy:
    Guo, X.
    Wang, R.-Q.
    Wang, C.D.
    Xu, F.
    Zhao, S.
    Guo, W.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/41339.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Acer truncatum
    seedling
    Quercus variabilis
    Chinese cork oak
    plant response
    light regime
    irradiance acclimation
    chlorophyll fluorescence
    morphology
    photoinhibition
    Opis:
    In this study, we investigated responses of the mid-successional species Acer truncatum Bunge and the late-successional species Quercus variabilis Blume to three solar illumination conditions: (1) constant low light (CL), (2) constant high light (CH) and (3) low light first and high light afterwards (LH). The last treatment was to simulate a canopy opening. Both species exhibited increases in biomass, totally and in part, and decreases in leaf water content, specific leaf area and chlorophyll concentrations in LH treatment compared to CL treatment. For A. truncatum, exposure to high light condition (LH) increased crown area, and decreased root to shoot ratio, stem mass ratio and leaf perimeter. However, for Q. variabilis, LH treatment increased stem diameter at ground height, effective quantum yield, photochemical quenching and decreased maximum photosystem II quantum yield. The biomass allocation pattern did not change in Q. variabilis among three light conditions. With respect to newly developed leaves, no significant differences were found in leaf size of Q. variabilis between LH treatment and CH treatment while that of A. truncatum decreased in LH treatment. All chlorophyll fluorescence parameters in newly developed oak leaves in LH treatment increased compared to those of CH treatment while no difference was found for A. truncatum between LH and CH treatment. A. truncatum displayed a greater overall plasticity than Q. variabilis although the oak seedlings have a greater plasticity with respect to chlorophyll concentration and chlorophyll fluorescence parameters. A. truncatum should be a better candidate for vegetation recovery, especially in places with heterogeneous light conditions.
    Źródło:
    Dendrobiology; 2016, 76
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability control of propeller Autonomous Underwater Vehicle based on combined sections method
    Autorzy:
    Qi, D.
    Feng, J.
    Liu, A.
    Hu, J.
    Xu, H.
    Li, Y.
    Ashraf, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/259119.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    propeller AUV
    dynamic model
    stability control
    simulation
    Opis:
    Learning from the motion principle of quadrotor, a symmetric propeller AUV, which has small size and low velocity is designed. Compared with the AUV equipped with rudders, it has better maneuverability and manipulation at low velocity. According to the Newton-Euler method, the 6 DOF kinematic model and dynamic model of the propeller AUV are established. A stability controller that consists of 3 different PID controllers is designed. It makes the depth and attitude angle as trigger conditions, and the relevant controller is chosen in different moving process. The simulation experiments simulate ideal motion state and disturbed motion state, and experiments results show that the stability controller based on combined sections method can make the best of mature technology of PID, and meet the control requirements in different stages. It has a higher respond speed and accuracy, improving the stability of the propeller AUV under the disturbance of complex ocean currents.
    Źródło:
    Polish Maritime Research; 2015, S 1; 157-162
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osteology of the Late Cretaceous alvarezsauroid Linhenykus monodactylus from China and comments on alvarezsauroid biogeography
    Autorzy:
    Xu, X.
    Upchurch, P.
    Ma, Q.
    Pittman, M.
    Choiniere, J.
    Sullivan, C.
    Hone, D.W.E.
    Tan, Q.
    Tan, L.
    Xiao, D.
    Han, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/20629.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    osteology
    Cretaceous
    Late Cretaceous
    alvarezsauroid
    Linhenykus monodactylus
    China
    biogeography
    Dinosauria
    Theropoda
    Parvicursorinae
    Treefitte
    dispersal
    vicariance
    sympatry
    Wulansuhai Formation
    Inner Mongolia
    Opis:
    The alvarezsauroid theropod Linhenykus monodactylus from the Upper Cretaceous of Inner Mongolia, China is the first knownmonodactyl non−avian dinosaur, providing important information on the complex patterns of manual evolution seen in alvarezsauroids. Herewe provide a detailed description of the osteology of this taxon. Linhenykus shows a number of fea− tures that are transitional between parvicursorine and non−parvicursorine alvarezsauroids, but detailed comparisons also re− veal that some characters had a more complex distribution. We also use event−based tree−fitting to perform a quantitative analysis of alvarezsauroid biogeography incorporating several recently discovered taxa. The results suggest that there is no statistical support for previous biogeographic hypotheses that favour pure vicariance or pure dispersal scenarios as explana− tions for the distributions of alvarezsauroids across SouthAmerica, NorthAmerica andAsia. Instead, statistically significant biogeographic reconstructions suggest a dominant role for sympatric (or “within area”) events, combined with a mix of vicariance, dispersal and regional extinction. At present the alvarezsauroid data set is too small to completely resolve the biogeographic history of this group: future studies will need to create larger data sets that encompass additional clades.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generation and characterization of a monoclonal antibody against duck Tembusu virus envelope protein
    Autorzy:
    Han, K.
    Zhao, D.
    Liu, Y.
    Liu, Q.
    Huang, X.
    Yang, J.
    Bi, K.
    Xu, T.
    Li, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/31495.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Duck Tembusu virus (DTMUV) is a newly emerging pathogenic flavivirus that has caused massive economic losses to the duck industry in China. Envelope (E) protein of DTMUV is an important structural protein, which is able to induce protective immune response in target animals and can be used as specific serological diagnosis tool. In this study, a novel monoclonal antibody, designated mAb 3E9, was generated against DTMUV E protein. It is positive in indirect ELISA against both His-E protein and the purified whole viral antigen. Also, this mAb showed positive reaction with DTMUV in Western blot and indirect immunofluorescence assay, and the isotype was IgG1. End-point neutralizing assay performed in BHK-21 cells revealed that the neutralization titer of 3E9 against DTMUV JS804 strain reached 1:50. Furthermore, functional studies revealed that 3E9 blocks infection of DTMUV at a step on viral attachment. The anti-E mAbs produced in the present work may be valuable in developing an antigen-capture ELISA test for antigen detection or a competitive ELISA test for antibody detection or therapeutic medicine for DTMUV in poultry.
    Źródło:
    Polish Journal of Veterinary Sciences; 2016, 19, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Simulation of Dynamic Pressure and Displacement for the Top Part of Men’s Socks Using the Finite Element Method
    Numeryczna symulacja ciśnienia dynamicznego i przesunięć w górnej części skarpet męskich
    Autorzy:
    Dan, R.
    Dan, M. H.
    Fan, X. R.
    Chen, D. S.
    Shi, Z.
    Zhang, M.
    Xu, L. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/234002.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    top part of socks
    pressure
    displacement
    finite element
    dynamic
    górna część skarpetki
    ciśnienie
    przemieszczenie
    elementy skończone
    dynamika
    Opis:
    Numerical simulation of elastic human body deformation and dynamic pressure and displacement distribution are critical for pressure comfort and optimal design of apparel products. This paper demonstrates an analytical method for simulating dynamic pressure and displacement at the top part of men’s socks using the finite element method (FEM). The dynamic pressure is divided into two parts: the first is pressure with time, and the second is pressure with walking. Pressure with time is set at six periods (maximum 12 h). After measuring pressure values in different periods of time and simulating pressure and displacement distribution using ANSYS software, the tendency of pressure and displacement changes with time at the top part of men’s socks can be obtained. We divided the walking process into four phases to analyse the variation rule of pressure and displacement changes with movement in this research work. Meanwhile the lower leg cross section is divided into four equal regions according to the angle, and dynamic changes in the area shrinkage mass of each region can be calculated, respectively. All these solutions provide a theoretical reference for the optimal design of the top part of men’s socks.
    Numeryczna symulacja elastycznej deformacji ciała ludzkiego, dynamicznego ciśnienia i rozkładu przesunięć są krytycznymi czynnikami komfortu i optymalnych rozwiązań ciśnieniowych wyrobów odzieżowych. Przedstawiono analityczną metodę symulacji ciśnień dynamicznych i przesunięć w górnej części męskich skarpet stosując metodę elementów skończonych. Analizę ciśnień dynamicznych przeprowadzono rozpatrując dwa stadia: zmiany ciśnienia w czasie i zmiany przy ruchu związane z chodzeniem. Na podstawie pomiarów ciśnienia i odkształcenia w określonych przedziałach czasowych określono rozkład odkształceń stosując program ANSYS. Proces chodzenia podzielono na cztery fazy. Wszystkie przeprowadzone badania i rozwiązania dostarczyły informacji dla przedstawienia optymalnego sposobu projektowania męskich skarpet.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2013, 4 (100); 112-117
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy Metal Contamination of Surface Water and Groundwater in and Around Gejiu Tin Mine, Southwest China
    Zanieczyszczenie wód powierzchniowych i podziemnych metalami ciężkimi w kopalni Gejiu Tin, południowo-zachodnie Chiny i jej okolicach
    Autorzy:
    Cheng, X.
    Qi, W.
    Danek, T.
    Matysek, D.
    Huang, Q.
    Zhao, X.
    Zhou, Z.
    Fang, R.
    Zou, L.
    Xu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/317873.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    metale ciężkie
    zanieczyszczenie
    kopalnia cyny Gejiu
    wody powierzchniowe
    wody kopalniane
    heavy metals
    contamination
    Gejiu tin mine
    surface water
    mine water
    Opis:
    Heavy metal contamination due to mining activity is a global major concern because of its potential health risks to local inhabitants. The heavy metal contamination of surface water and ground water by mining activities in Gejiu tin-polymetallic mining area, Southwest China, was studied. Surface water and ground water were sampled and analyzed using AAS for Cr6+, Cd, As, Hg, Cu, Pb, Zn, Se, Fe and Mn. Analysis of HCO3–, Cl–, SO42–, F– and NO3– in water samples was also undertaken by ion chromatography. It was shown that none of water samples exceeded the guideline of Cr6+, Se and Hg, while the contamination degree of heavy metals was Mn > Fe > Cd > Zn > Pb > As > Cu, all of which were serious contamination except mild contamination for Cu. The ground waters were polluted much worse than surface water.
    Zanieczyszczenie metalami ciężkimi spowodowane działalnością kopalń jest światowym problemem z powodu ryzyka utraty zdrowia przez okolicznych mieszkańców. Zbadano zanieczyszczenie wód powierzchniowych oraz wód podziemnych wywołane działalnością kopalni cyny w rejonie górniczym Gejiu, południowo-zachodnie Chiny. Pobrano próbki wody powierzchniowej oraz podziemnej i zanalizowano je ze względu na obecność Cd, As, Hg, Cu, Pb, Zn, Se, Fe oraz Mn. Analizy HCO3–, Cl–, SO42–, F– oraz NO3– w próbkach wody również zostały przeprowadzone za pomocą chromatografii jonowej. Ukazano, że żadna z badanych wód nie przekroczyła dopuszczalnych poziomów dla Cr6+, Se oraz Hg. Jednakże poziom zanieczyszczenia metali ciężkimi tj. Mn > Fe > Cd > Zn > Pb > As > Cu był wysoki, za wyjątkiem niewielkiego przekroczenia norm dla Cu. Wody podziemne były znacznie bardziej zanieczyszczone niż wody powierzchniowe.
    Źródło:
    Inżynieria Mineralna; 2016, R. 17, nr 1, 1; 93-98
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of organic cultivation pattern on tomato production: plant growth characteristics, quality, disease resistance, and soil physical and chemical properties
    Autorzy:
    Feng, X.
    Xu, Y.
    Liu, D.
    Peng, L.
    Dong, J.
    Yao, S.
    Feng, Y.
    Feng, Z.
    Li, F.
    Hu, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/12703546.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Tomato (Solanum lycopersicum L.) is one of the world’s most important cultivated vegetable. In the traditional cultivation methods, the excessive use of pesticides and fertilizers leads to an imbalance of nutrient elements in the soil, an increase in pests and diseases and a decrease in vegetable quality and yield. In the face of increasingly serious environmental and food problems, organic agriculture is considered to be an effective solution. In this experiment, the effects of organic cultivation patterns on the growth, quality, disease resistance in tomatoes, and the physical and chemical properties of soil were studied by different treatments. The results showed that the application of effective microorganisms (EM) bio-organic fertilizer in the cultivation process can significantly improve the yield, quality, and antioxidant enzyme activity of tomato. The use of straw mulching was found to significantly increase the growth, chlorophyll content, transpiration rate, and soluble sugar content of tomatoes. The application of EM bio-organic fertilizer or straw mulching significantly increased the activity of antioxidant enzyme and the expression of LeCHI gene in tomato leaves and enhanced tomato resistance to diseases. Organic production practices were found to significantly improve the soil.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 1; 71-84
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of experimental infections of various Tembusu virus strains isolated from geese, ducks and chickens on ducklings
    Autorzy:
    Xu, T.
    Huang, X.
    Li, Y.
    Liu, Q.
    Liu, X.
    Han, K.
    Liu, Y.
    Yang, J.
    Zhao, D.
    Bi, K.
    Sun, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087719.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    goose-derived
    duck-derived
    chicken-derived
    Tembusu virus
    pathogenicity
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 2; 389-396
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-40 z 40

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