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    Wyświetlanie 1-35 z 35
    Tytuł:
    Dynamic expression profile of DNA methyltransferases in rat testis development
    Autorzy:
    Xu, H.X.
    Qin, J.Z.
    Zhang, K.Y.
    Zeng, W.X.
    Powiązania:
    https://bibliotekanauki.pl/articles/31635.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    DNA methyltransferases (Dnmts) are unique and perform specific functions during male germ cell development. To further characterize the significance of Dnmts in the events leading to production of spermatozoa, we investigated whether the expression patterns in Dnmt1, Dnmt3a, Dnmt3b and Dnmt3l were apparent in rat testes at different time points during development. The qRT-PCR results showed that expression levels of Dnmt3a and Dnmt3l were abundant before birth and were present at the highest levels in testes tissue at 18.5 days postcoitus (dpc), and gradually decreased from day 0 postpartum (dpp) to 90 dpp. Expression of Dnmt1 and Dnmt3b reached a peak after birth (P <0.01), and then gradually reduced until adulthood. Western blotting and immunolocalization analysis of Dnmt3a and Dnmt3b further confirmed the differential expression and localization of the two proteins during rat testis development. The dynamic expression profile of Dnmts implies specific and potentially nonredundant roles for each of these enzymes in the developing rat testis.
    Źródło:
    Polish Journal of Veterinary Sciences; 2015, 18, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combustion Characteristics and Mechanism of Boron-based, Fuel-rich Propellants with Agglomerated Boron Powder
    Autorzy:
    Xu, H. -X.
    Pang, W.-Q.
    Guo, H.-W.
    Zhao, F.-Q.
    Wang, Y.
    Sun, Z.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/358733.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    analytical chemistry
    boron-based fuel-rich solid propellants
    agglomerated boron powder
    combustion performance
    combustion mechanism
    Opis:
    In order to extend the burning rate of boron-based, fuel-rich solid propellants with agglomerated boron powder, the effects of the boron content, the AP content, and of the magnesium powder content, on the burning rate and pressure exponent have been studied systematically. It has been shown that when the AP content is constant, the burning rate of the propellants increases with an increase in the agglomerated boron content. Furthermore, the burning rate and pressure exponent increase with increasing the contents of AP and magnesium powder. By means of single colour frame amplification photography and combustion wave tests, the combustion mechanism of these propellants has been investigated. It has been shown that the flame of the propellants becomes brighter by increasing the AP content, the dT/dxcp and dT/dxgp of the propellant FR-5 being around 6815 and 5789 °C/mm respectively, higher than those of FR-4, resulting in greater burning rates. The Ts of these propellants is above 683 °C, which is higher than the decomposition peak temperatures of agglomerated boron powder and of propellants (about 649 °C), which indicates that agglomerated boron powder is partially oxidized on the combustion surface, and the heat released from it may be beneficial to the combustion of the propellants.
    Źródło:
    Central European Journal of Energetic Materials; 2014, 11, 4; 575-587
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of a High Energy Combustion Agent (BHN) and Its Effects on the Combustion Properties of Fuel Rich Solid Rocket Propellants
    Autorzy:
    Pang, W.-Q.
    Zhao, F.-Q.
    Xue, Y.-N.
    Xu, H.-X.
    Fan, X.-Z.
    Xie, W.-X.
    Zhang, W.
    Lv, J.
    Deluca, L. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/358474.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    fuel rich solid propellant
    BHN
    DSC
    TG-DTG
    burning rate
    combustion properties
    Opis:
    A high energy combustion agent (tetraethylammonium decahydrodecaborate, BHN) was prepared by means of an ion exchange reaction (IER), and the prepared samples were characterized by the advanced diagnostic techniques of Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Thermogravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC) etc. The effects of BHN particles on the hazard and combustion properties of fuel rich solid propellants were investigated. The results showed that the BHN samples and fuel rich propellants containing BHN particles can be prepared successfully and solidified safely. The peak temperature of thermal decomposition and the heat of decomposition of the BHN samples prepared were 305.8 °C and 210.9 J•g-1 at a heating rate of 10 K•min-1, respectively. The burning rate and pressure exponent of fuel rich solid propellants decreases with increases in the fraction of BHN particles in the propellant formulation. Compared with the reference formulation (sample BP-1), the burning rate of the propellant with 10% mass fraction of BHN particles (sample BP-4) had decreased 30% at 3.0 MPa, and the pressure exponent had dropped from 0.44 to 0.41.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 3; 537-552
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intervalley Transfer of Electrons in ZnS-Type Thin Film Electroluminescent Devices
    Autorzy:
    Zhao, H.
    Wang, Y.
    Xu, Z.
    Xu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011094.pdf
    Data publikacji:
    1999-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.-i
    78.60.-b
    Opis:
    Based on the calculation about intervalley scattering rates in ZnS, the intervalley transfer process in ZnS-type thin film electroluminescent devices is investigated through the Monte Carlo simulation. The transient time of intervalley transfer is about 0.2-0.3 ps, it coincides with that of electron average energy. Intervalley distribution shifts to high valleys as the electric field increased. The electron kinetic energy distributions in different valleys are also gained. We propose that high valleys could store energies, which could prolong the decay of the electron average energy as the field was removed. These results could be used as the basic data on the study of electroluminescent process and the citation of valley parameters in analytic models should be carefully considered.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 3-4; 475-482
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical Band Model in Monte Carlo Simulation of Electric Transport in ZnS Thin Film Electroluminescent Devices
    Autorzy:
    Zhao, H.
    Wang, Y.
    Xu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014087.pdf
    Data publikacji:
    2000-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.-b
    72.20.-i
    Opis:
    In this paper, an analytical band model is introduced in Monte Carlo simulation of electric transport process in thin film electroluminescent devices. The band structure of ZnS calculated from the empirical pseudopotential method is fitted by using polynomials. The density of states and scattering rates are also calculated from these polynomials. Based on these results, the electric transport process in ZnS-type thin film electroluminescent devices is simulated through the Monte Carlo method. By comparison with others, this model is as fast as the nonparabolic model and as accurate as the full band model. Furthermore, the influence of the band model on the simulation results is also investigated. We show that the dispersion relation and density of states are all important in the simulation.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 1-2; 123-130
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A reliability analysis method of cloud theory – Monte Carlo based on performance degradation data
    Oparta na teorii chmury i modelu Monte Carlo metoda analizy niezawodnościowej danych o obniżeniu charakterystyk
    Autorzy:
    Yang, H.
    Xu, G.
    Fan, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/301128.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    performance degradation
    Cloud theory
    Monte Carlo method
    randomness
    fuzziness
    obniżenie charakterystyk
    teoria chmury
    metoda Monte Carlo
    losowość
    rozmycie
    Opis:
    Owing to inadequate degradation data, the randomness and the fuzziness of degradation processes, it is difficult to calculate the reliability of product. By investigating performance reliability using degradation data of performance, the authors proposed a method of analyzing reliability of performance degradation data using Monte Carlo principle and cloud theory. First of all, the performance degradation cloud with the degradation amount and the entropy which denotes the possible discrete degree of the degradation data, is generated by using performance degradation data and a cloud theory forward cloud generator. Then, the minimum membership threshold of cloud droplets and the threshold of product failure were set. Meanwhile, the number of cloud droplets that comply with the minimum membership degree and the failure threshold were counted. Finally, the reliability method of performance degradation data was proposed by using the principle of Monte Carlo and the cloud theory. In this work, the cloud theory was introduced to verify the reliability of the performance degradation of the product. The randomness and the fuzziness in the degradation tests are resolved. In addition, due to the limits of degradation test data, the difficulties in calculation of the reliability is resolved using the principle of Monte Carlo, the minimum membership of cloud droplets and its minimum degree are therefore guaranteed. This work provides a new method of simulating the reliability of degradation. The feasibility of the method was validated by an example ensuring a high durability of conveyor belt joints is tantamount to guaranteeing their reliable operation and that the results of research conducted so far fail to provide unambiguous solutions to a number of problems that emerge in this case, it is advisable that advanced studies using computer techniques should be conducted within this area.
    Ze względu na niewystarczające dane o degradacji oraz losowość i rozmycie procesów degradacji, obliczanie niezawodności produktu jest zadaniem trudnym. Chcąc badać niezawodność przy użyciu danych dotyczących obniżenia charakterystyk, autorzy zaproponowali metodę analizy danych o obniżeniu charakterystyk wykorzystującą zasady metody Monte Carlo oraz teorii chmury. Po pierwsze, wykorzystując dane o obniżeniu charakterystyk oraz progresywny generator chmur, wygenerowano chmurę obniżenia charakterystyk zawierającą dane na temat stopnia degradacji oraz stopnia entropii, która określa możliwy dyskretny stopień degradacji danych. Następnie, ustalono minimalny próg przynależności punktów chmury oraz próg uszkodzenia produktu. Policzono liczbę punktów chmury które spełniały warunek minimalnego stopnia przynależności oraz progu uszkodzenia. Wreszcie, zaproponowano metodę analizy niezawodnościowej danych o obniżeniu charakterystyk wykorzystującą zasady modelu Monte Carlo oraz teorii chmury. W pracy przedstawiono teorię chmury, która pozwala na weryfikację niezawodności danych of obniżeniu charakterystyk produktu. Rozwiązano w ten sposób problem losowości i rozmycia występujące w badaniach degradacji. Ponadto, przy użyciu metody Monte Carlo, rozwiązano trudności w obliczaniu niezawodności związane z ograniczeniami danych z badań degradacji, co zagwarantowało minimalną przynależność punktów chmury oraz minimalny stopień uszkodzenia. W prezentowanej pracy przedstawiono nową metodę symulacji niezawodności danych o degradacji. Poprawność przedstawionej metody zweryfikowano na podstawie przykładu. Zapewnienie wysokiej trwałości złączy taśmy przenośnikowej jest równoznaczne z zapewnieniem ich niezawodnej pracy, a ponieważ wyniki prowadzonych dotąd badań nie dostarczają jednoznacznych rozwiązań wielu wyłaniających się w tym przypadku problemów, wskazane jest prowadzenie w tym zakresie zaawansowanych badań z użyciem technik komputerowych.
    Źródło:
    Eksploatacja i Niezawodność; 2015, 17, 3; 435-442
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of PolyNIMMO-HTPB-polyNIMMO Triblock Copolymer as a Potential Energetic Binder
    Autorzy:
    Wang, X.
    Shu, Y.
    Lu, X.
    Mo, H.
    Xu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358529.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    triblock copolymer
    cationic ring opening polymerization
    polymer
    DSC
    Opis:
    Triblock copolymer polyNIMMO-HTPB-polyNIMMO was synthesized by cationic ring opening polymerization of NIMMO (3-nitratomethyl-3-methyloxetane) in the presence of hydroxyl-terminated polybutadiene catalyzed by BF3·OEt2. The polymer was characterized by FT-IR, 1H NMR, 13C NMR spectroscopy, and GPC. DSC was used to investigate the thermal behaviour of the triblock copolymer and its exothermic decomposition peak was found to be at 215 °C. All of the results indicated that the triblock copolymer polyNIMMO-HTPB-polyNIMMO might serve as a potential energetic propellant binder.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 3; 456-467
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis on electromechanical coupling vibration characteristics of in-wheel motor in electric vehicles considering air gap eccentricity
    Autorzy:
    Li, Y.
    Wu, H.
    Xu, X.
    Cai, Y.
    Sun, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/200165.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    BLDC in-wheel motor
    rotor eccentricity
    unbalanced magnetic force
    electric vehicle
    electromechanical coupling vibrat
    Opis:
    The distortion of air gap magnetic field caused by the rotor eccentricity contributes to the electromechanical coupling vibration of the brushless DC (BLDC) permanent magnet in-wheel motor (PMIWM) in electric vehicles (EV). The comfort of the BLDC in-wheel motor drive (IWMD) EV is seriously affected. To deeply investigate the electromechanical coupling vibration of the PMIWM under air gap eccentricity, the PMIWM, tyre and road excitation are analyzed first. The influence of air gap eccentricity on air gap magnetic density is investigated. The coupling law of the air gap and the unbalanced magnetic force (UMF) is studied. The coupling characteristics of eccentricity rate, air gap magnetic density, UMF, phase current and vibration acceleration are verified on the test bench in the laboratory. The mechanism of the electro-mechanical coupling vibration of the BLDC PMIWM under air gap static eccentricity (SE), dynamic eccentricity (DE) and hybrid eccentricity (HE) is revealed. DE and HE deteriorate the vibration acceleration amplitude, which contributes the electromechanical coupling vibration of the PMIWM. The research results provide a solid foundation for the vibration and noise suppression of the PMIWM in distributed drive EV.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 851-862
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antibiofilm activity against Staphylococcus aureus and content analysis of Taraxacum Officinale phenolic extract
    Autorzy:
    Xu, P.
    Xu, X.B.
    Khan, A.
    Fotina, T.
    Wang, S.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087162.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Taraxacum Officinale
    phenolic
    antibacterial mechanism
    HPLC
    Staphylococcus aureus
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 2; 243-251
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    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:
    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:
    3D Simulation of Warp Knitted Structures with a New Algorithm Based on NURBS
    Symulacja 3D struktur dzianych z zastosowaniem algorytmu opartego na algorytmie NURBS
    Autorzy:
    Xu, H Y
    Chen, N L
    Jiang, J H
    Jin, L X
    Wang, Z X
    Powiązania:
    https://bibliotekanauki.pl/articles/232913.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    warp knitted stitch
    three-dimensional simulation
    NURBS
    joint of stitches
    MATLAB
    ścieg osnowy tkaniny
    struktura dzianin
    symulacja trójwymiarowy
    algorytm NURBS
    wspólne szwów
    oprogramowanie Matlab
    Opis:
    In order to obtain a three-dimensional computer simulation of warp knitted structures with more flexibility and realism, a new algorithm using Matlab was developed by NURBS based on empirical geometrical loop models. With the principles of NURBS curves, once the values of data points are known, the control points with two coincidence points at the start and end points can be uncomplicatedly calculated by Matlab. Then the NURBS curve of a single typical stitch can be simulated flexibly by Matlab. A new typical stitch selected from two stitches simulated directly by the new method is redefined to improve the joint of neighboring stitches, and it is found that there are two types of redefined typical warp knitted stitches judged by whether the two under lap on the same side or not. Based on the redefined typical warp knitted stitch, two warp knitted structures are simulated regardless of the loop offset, and all the joints of stitches are smooth.
    Przeprowadzono symulację komputerową struktur dzianin w wymiarze 3D, opracowując w tym celu nową procedurę opartą na algorytmie NURBS. Do tego celu wykorzystano oprogramowanie MATLAB. Symulację 3D przeprowadzono w oparciu o procedury numeryczne umożliwiające wykreślenie przestrzennych figur geometrycznych opisujących strukturę dzianin. Symulowano kształt oczek zamkniętych i otwartych podstawowych splotów kolumienkowych trykotu, sukna i aksamitu. W oparciu o 8 punktów referencyjnych zorientowano konfigurację pętli oczka i łącznika w postaci przestrzennej linii eliptycznej. Do zapisu struktury splotu kształtu oczek wykorzystywano aparat matematyczny w postaci macierzy.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 1 (109); 57-60
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Jiyuan tetrapod fauna of the Upper Permian of China: new pareiasaur material and the reestablishment of Honania complicidentata
    Autorzy:
    Xu, L.
    Li, X.-W.
    Jia, S.-H.
    Liu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/22012.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Honania complicidentata and Tsiyuania simplicidentata are pareiasaur taxa based on material from the Shangshihezi Formation of Jiyuan, Henan Province, China that were earlier designated as nomina vana. Based on the study of new material, and the reexamination of old specimens, we determine that the pareiasaur material from Jiyuan represents a single species that differs from all known species from other localities. Thus, we resurrect the name H. complicidentata for the material from Jiyuan. H. complicidentata is characterized by maxillary teeth with high crowns, dentary teeth slightly posteriorly inclined compared to the dentary dorsal margin, nearly all preserved marginal teeth have a cusped cingulum on the lingual surface, and humerus without an ectepicondylar foramen. Phylogenetic analysis shows Honania is more basal than Shansisaurus and Shihtienfenia from the Sunjiagou Formation of China.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of quinoline from aqueous solutions by lignite, coking coal and anthracite. Adsorption isotherms and thermodynamics
    Autorzy:
    Xu, H.
    Huagn, G.
    Li, X.
    Gao, L.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/110016.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quinoline adsorption
    coking coal
    adsorption isotherms
    thermodynamics
    Opis:
    Based on the concept of circular economy, a novel method of industrial organic wastewater treatment by using adsorption on coal is introduced. Coal is used to adsorb organic pollutants from coking wastewaters. After adsorption, the coal would be used for its original purpose, its value is not reduced and the pollutant is thus recycled. Through systemic circulation of coking wastewater zero emissions can be achieved. Lignite, coking coal and anthracite were used as adsorbents in batch experiments. The quinoline removal efficiency of coal adsorption was investigated. The coking coal and anthracite exhibited properties well-suited for adsorption onto both adsorbents. The experimental data were fitted to Langmuir and Freundlich isotherms as well as Temkin, Redlich–Peterson (R-P) and Dubinin-Radushkevich (D-R) models. Both Freundlich Isotherm and D-R model provided reasonable models of the adsorption process. The thermodynamic parameters of quinoline adsorption on coking coal were calculated. The thermodynamic parameters indicated that the adsorption process is exothermic and is a physical adsorption. The △S° value indicated that the adsorption entropy decreased because the adsorbate molecule was under restrictions after it adsorption on the coal surface. The coal adsorption method for removing refractory organic pollutants is a great hope for achieving zero emission waste water for a coking plant.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 214-227
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pretreatment of coking wastewater by an adsorption process using fine coking coal
    Autorzy:
    Gao, L.
    Li, S.
    Wang, Y.
    Gui, X.
    Xu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/110417.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coking coal
    coking wastewater
    adsorption
    COD
    phenol
    Opis:
    A new technique for pretreatment of coking wastewater is introduced based on the concept of circular economy. Coal is fed into a coking system after adsorption. This study validates the feasibility of using coking coal to adsorb organic pollutants in coking wastewater. The sorption kinetics and equilibrium sorption isotherms of coking coal for removal of chemical oxygen demand (COD) and phenol from coking wastewater was also discussed in this paper. Gas chromatograph/mass spectroscopy (GC/MS) was used to detect changes in the quality of coking wastewater. The results showed that when coking coal dosage was 120 g/dm3, 65% of COD and 34% of phenol in waste water can be removed after 40 min of agitation. The surface functional groups of coking coal before and after adsorption were observed with a Fourier transform infrared spectrometer. The kinetics of COD and phenol adsorption from coking wastewater by coking coal fitted the pseudo second-order model. The adsorption process of coking coal can be classified into two categories, namely, rapid and slow. The Freundlich isotherm provided a better fit with all adsorption isotherms than the Langmuir isotherm. Coking coal could be a suitable low-cost adsorbent for recalcitrant organic pollutants.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 422-436
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An investigation of mechanical properties of recycled coarse aggregate concrete
    Badania właściwości mechanicznych betonu kruszywowego wtórnego wykonanego z użyciem kruszywa gruboziarnistego także pochodzenia wtórnego
    Autorzy:
    Deng, X. H.
    Lu, Z. L.
    Li, P.
    Xu, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/962346.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton
    kruszywo gruboziarniste
    kruszywo z recyklingu
    stosunek wodno-cementowy
    wskaźnik zamiany
    wytrzymałość na ściskanie
    wytrzymałość na rozciąganie
    rozłupywanie
    concrete
    coarse aggregate
    recycled aggregate
    water-cement ratio
    replacement rate
    compression strength
    tensile strength
    splitting
    Opis:
    Recycling construction and demolition waste not only reduces project costs; and saves natural resources, but also solves the environmental threat caused by construction waste disposal. In this paper, C25 waste road concrete is used as an experimental material, the uniaxial compression strength and tensile splitting strength of C25 RAC whose coarse aggregate replacement rate is 0%, 25%, 50%, 75%, and 100% are tested under the condition that the water-to-cement ratio is 0.47, 0.55 and 0.61. The results show: (1) the uniaxial compression strength and tensile splitting strength decrease with the increase of RAC; (2) for concrete with the same water-to-cement ratio, when the coarse aggregate replacement rate changes from 0% to 50%, the uniaxial compression strength and tensile splitting strength of RAC changes slightly. When the coarse aggregate replacement rate changes from 50% to 100%, the uniaxial compression strength and tensile splitting strength of RAC decreases rapidly.
    Recykling odpadów budowlanych oraz materiałów pochodzących z rozbiórek nie tylko zmniejsza koszty projektu i oszczędza zasoby naturalne, ale również zażegnuje zagrożenie dla środowiska spowodowane przez składowanie odpadów budowlanych. Szczególnie w odniesieniu do właściwości mechanicznych betonu z kruszywa gruboziarnistego poddanego recyklingowi, odpady betonu drogowego C25 są używane jako materiał eksperymentalny, pod warunkiem że stosunek wody do cementu wynosi 0,47, 0,55 i 0,61 oraz są przygotowane próbki betonu o wskaźniku zamiany betonu z kruszywa gruboziarnistego poddawanego recyklingowi wynoszącym 25%, 50%, 75% i 100% betonu z naturalnego kruszywa gruboziarnistego. Próbka to sześcian o wymiarach 150 × 150 × 150 mm. Przygotowaliśmy 6 próbek dla każdego wskaźnika zamiany betonu z kruszywa gruboziarnistego poddawanego recyklingowi. Przygotowano łącznie 90 próbek betonu. Próbki zostały usunięte 24 godziny po ustawieniu oraz były utwardzane w temperaturze 20°C i wilgotności 90% przez 28 dni. Następnie przeprowadzono próby ściskania jednoosiowego oraz wytrzymałości na rozciąganie przez rozłupywanie betonu z kruszywa poddawanego recyklingowi C25.
    Źródło:
    Archives of Civil Engineering; 2016, 62, 4/II; 19-34
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular characterization and expression patterns of ghrelin in the reindeer (Rangifer tarandus)
    Autorzy:
    Zhang, M.
    Xu, X.
    Zhu, X.
    Jin, X.
    Bao, H.
    Dugeer, S.
    Du, C.
    Cao, G.
    Yang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087780.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ghrelin
    reindeer (Rangifer tarandus)
    cDNA cloning
    structural characterization
    tissue expression
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 1; 55-64
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Phyllosticta hostae causing Phyllosticta leaf spot on spider lily in China
    Autorzy:
    Yi, R.H.
    Gan, L.J.
    Chen, J.
    Xu, X.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/66837.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Phyllosticta hostae
    leaf spot
    plant disease
    spider lily
    Hymenocallis littoralis
    tropical plant
    herb
    China
    Opis:
    Leaf spot disease on the spider lily [Hymenocallis littoralis (Jacq.) Salisb.] continues to cause serious problems in China. To confirm the pathogen, the pathogenicity of isolates from diseased leaves was tested according to Koch’s postulates. The isolates were tentatively identified using morphological characteristics and confirmation was done by phylogenetic analysis of the translation elongation factor 1-alpha gene (TEF1), the actin gene (ACT), and internal transcibed spacer (ITS) sequences using neighbor-joining (NJ), maximum parsimony (MP), and Bayesian inference (BI) methods. The pathogen was identified as Phyllosticta hostae. Molecular analysis indicated very little diversity in the TEF1, ACT, and ITS gene. This is the first report of P. hostae causing leaf spot disease on spider lily in China.
    Źródło:
    Journal of Plant Protection Research; 2015, 55, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of gas holdup on the efficiency of cyclonic-static microbubble flotation column for oily wastewater treatment
    Autorzy:
    Ning, K.
    Huang, G.
    Xu, H.
    Wu, L.
    Li, X.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/208139.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bubble columns
    efficiency
    flotation
    wastewater treatment
    oil water separation
    kolumna flotacyjna
    efektywność
    flotacja
    oczyszczanie ścieków
    separacja wody
    Opis:
    A cyclonic-static microbubble flotation column of a novel construction was used in oil-water separation fields and has high efficiency for oil-water separation. The gas holdup is a key parameter for the evaluation of the performance of a flotation column. The gas holdup, closely related to the bubble size, bubble velocity and superficial gas velocity, is one of the most important parameters characterizing the hydrodynamics of a bubble column. The effect of gas holdup in a cyclonic-static microbubble flotation column was investigated. In addition, several operating parameters such as the circulating pressure, superficial gas velocity, and frother consumption were also investigated. The gas holdup was positively correlated to the superficial gas velocity. The gas holdup of clean water and oil wastewater increased along with the increase of the frother consumption. The separation mechanism of cyclonic-static microbubble flotation column was analyzed.
    Źródło:
    Environment Protection Engineering; 2018, 44, 2; 5-17
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    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:
    A study of bubble-particle interactions in a column flotation process
    Autorzy:
    Cheng, G.
    Shi, C.
    Yan, X.
    Zhang, Z.
    Xu, H.
    Lu, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/109635.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    particle
    bubble
    column flotation
    collision
    attachment
    detachment
    Opis:
    Bubble-particle interactions play an important role in flotation. This study examines the behaviour of bubble clusters in a turbulent flotation cell. Particularly, the bubble-particle interaction characteristics in flotation are investigated. The bubble size in a flotation column was measured using an Olympus i-SPEED 3 high-speed camera. Relationships between the circulating volume, bubble size and bubble terminal velocity were discussed. Probabilities of collision, attachment, detachment and acquisition between bubbles and particles in different circulating volumes were calculated based on the flotation kinetic theory. Using the extended Derjaguin–Landau–Verwey–Overbeek (EDLVO) theory, the relationship between the potential energy and distance in bubble-particle interaction was analysed. The results demonstrated that as the circulating volume increased, the bubble size and velocity decreased. When the circulating volume increased from 0.253 to 0.495 m3/h, the bubble diameter decreased from 511 to 462 μm, and the corresponding bubble velocity decreased from 43.1 to 37.5 mm/s. When the circulating volume remained constant as the particle size increased, probabilities of collision, attachment, detachment and acquisition increased. When the particle size remained constant as the circulating volume increased, these probabilities also increased. At a constant circulating volume as the particle size increased, the absolute value of the total potential energy between the particle and bubble increased. When the distance between the bubble and particle was 30 nm, the energy barrier appeared.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 1; 17-33
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of different sources of donor cells upon the nuclear transfer efficiency in Chinese indigenous Meishan pig
    Autorzy:
    Hua, Z.
    Xu, G.
    Liu, X.
    Bi, Y.
    Xiao, H.
    Hua, W.
    Li, L.
    Zhang, L.
    Ren, H.
    Zheng, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/31224.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Somatic cell nuclear transfer (SCNT) is currently the most efficient and precise method to generate genetically tailored pig models for both agricultural and biomedical research. However, its efficiency is crucially dependent on the source of nuclear donor cells. In this study, we compared the cloning efficiency by using three lines of donor cells that are derived from fetal, newborn and adult fibroblasts of Chinese indigenous Meishan pig. We showed that cleavage rate and blastocyst formation rate of the reconstructed embryos were not significantly different between the fetal (80.7% and 15.6%) and newborn ear skin (77.5% and 12.3%) fibroblast groups (p>0.05), but in both groups these indices were significantly higher than that found in the adult ear skin (70.5% and 8.8%; p<0.05). Reconstructed embryos derived from fetal, newborn, and adult ear skin fibroblasts were transferred to four surrogates, respectively. For the fetal, newborn, and adult ear skin fibroblasts, the number of pregnancies were two (50.0%), two (50.0%), and one (25.0%), respectively, and the number of deliveries were two (50.0%), one (25.0%), and zero (0.0%), respectively. Seven and two cloned piglets were obtained from the fetal and newborn ear skin fibroblasts respectively, while no piglets were obtained from the adult ear skin fibroblasts. Two cloned piglets from the newborn ear skin fibroblasts died shortly after birth because of neonatal asphyxia caused by dystocia. The birth weights of the piglets derived from the fetal and newborn ear skin fibroblasts were 1230.5 and 1310.0g, respectively, which were statistically insignificant (p>0.05), but both were significantly higher than that of the control groups (p<0.05). Microsatellite analyses demonstrated that the genotypes of all cloned piglets were identical to their donor cells. Therefore, cloned pigs were successfully produced using two sources of donor cells isolated from the fetal and newborn ear skin fibroblasts of Meishan piglet, and indicating a better cloning efficiency than that obtained from adult fibroblasts. We concluded that the nuclear donor cell lines have significant impact on the developmental competence of cloned embryos as well as on the cloning efficiency of Meishan pig.
    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:
    Phase features of several typical blood cells and their identification without unwrapping
    Autorzy:
    Wang, Y.
    Chen, Y
    Lü, C.
    Shang, X.
    Xu, Y.
    Wu, H.
    Zhu, X.
    Jin, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/173588.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    digital holographic phase
    nucleated cell
    phase model
    wrapped phase features
    identification
    Opis:
    The digital holographic phase microscopy (DHPM) technique which has been proposed for cellular morphology and dynamic analysis yielded highly desirable results. However, for nucleated cells (especially white blood cells (WBCs)), their submicroscopic structure has not yet been deconstructed through a phase unwrapping method due to the heterogeneity of an internal phase. By analyzing the phase heterogeneity of subclasses of WBCs, the typical phase models of them are built first in this paper; using the simulation method, the wrapped phase distributions of these models are obtained. However, by optimizing the wrapped phase maps and analyzing the relationships between them and typical blood cells, their features are selected and extracted. Then the models built are sorted out from each other successfully without unwrapping via analyzing these extracted features, which provides a valuable approach and technological base for the classification and identification of blood cells.
    Źródło:
    Optica Applicata; 2013, 43, 3; 505-514
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    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:
    Removal of quinoline from aqueous solutions by lignite, coking coal and anthracite. Adsorption kinetics
    Autorzy:
    Xu, H.
    Wang, Y.
    Huagn, G.
    Fan, G.
    Gao, L.
    Li, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/110664.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quinoline adsorption
    coking coal
    kinetics
    adsorption activation energy
    coal adsorption
    Opis:
    Basing on the concept of circular economy, a novel method of industrial organic wastewater treatment by using adsorption on coal is introduced. Coal is used to adsorb organic pollutants from coking wastewaters. After adsorption, the coal would be used in its original purpose, as its value was not reduced and the pollutant was reused. Through the systemic circulation of coking wastewater zero emissions can be achieved. Lignite, coking coal and anthracite were used as adsorbents in batch experiments. The quinoline removal efficiency of coal adsorption was investigated. Both the coking coal and anthracite exhibited properties well-suited for quinoline adsorption removal. The experimental data were fitted to the pseudo-first- order and pseudo-second-order kinetic equations as well as intraparticle diffusion and Bangham models. An attempt was made to find the rate-limiting step involved in the adsorption processes. Both boundary-layer diffusion and intraparticle diffusion are likely involved in the rate-limiting mechanisms. Effect of pH on coal adsorptions by coking coal was investigated. The process of quinoline adsorption on coal was researched. The coal adsorption method for removing refractory organic pollutants is a great hope for achieving wastewater zero emission for coking plants.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 397-408
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal dynamics in cambial activity and the formation of xylem and phloem in the branches of Cinnamomum camphora
    Autorzy:
    Dong, M.
    Xu, Y.M.
    Lin, H.
    Li, X.Q.
    Xia, Q.Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/41385.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    seasonal dynamics
    cambial activity
    formation
    xylem
    phloem
    branch formation
    tree
    tropical tree
    Cinnamomum camphora
    wood formation
    phenology
    Opis:
    The cambial activity and periodicity of secondary xylem and phloem formation have been less studied in tropical tree species than in temperate ones. Cambium activity is the only source of timber production. Studies on its activity and xylem formation can provide helpful data for dendrochronology and possible factors that control tree growth, the yield and quality of wood. Cinnamomum camphora is an important fast-growing tree for furniture and sculpture wood in South China. Its dynamics of cambial activity was not reported. During the growth season in 2011, five trees of Cinnamomum camphora plantation were monitored on the campus of Huazhong Agricultural University in central china (located on 113°41’ to 115°05’ E and 29°58’ to 31°22’ N). Sampling time was from 13, February 2011 to 13, February 2012. Some small stems of 15–20 cm length were selected to sample in the middle of 2–3 years old health branches in the central crown of these trees. The observational study found that the cambium of camphor trees was active from March to October and dormant from November to February. Onset of cambial cell division was observed in early March, one week after sprouting of new buds. The morphology of the cells and number of cell layers in the cambium zone varied throughout the year. In early March, cambium reactivated with the rising of temperature, the cell wall was relative thick. The number of cell layers increased from 2–3 in middle Feb. to 3–5. In June, the number of cell layers in cambium reached the maximum of 5–7 in a radial direction. In mid March, phloem cells began to differentiate, followed by xylem three weeks later. The number of cell layers in immature phloem and xylem increased dramatically before mid June and the increment of cell layers in xylem was almost fifth times of phloem in the differentiating process. The phloem cells mainly stopped dividing new cells in end of October, but xylem cells were still in the activity a week later. The annual activities of cambium was in accordance with the air mean temperature change in 2011–2012. The results showed that the cambial activity and formation of xylem and phloem were related to the environmental factors, especially the temperature.
    Źródło:
    Dendrobiology; 2016, 75
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bacterial communities in PM2.5 and PM10 in broiler houses at different broiler growth stages in spring
    Autorzy:
    Zhang, J.
    Li, Y.
    Xu, E.
    Jiang, L.
    Tang, J.
    Li, M.
    Zhao, X.
    Chen, G.
    Zhu, H.
    Yu, X.
    Zhang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087465.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bacterial communities
    broilers
    high-throughput sequencing
    particulate matter
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 3; 495-504
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Mechanism and Kinetics of Polymorphic Transitions of ε CL-20 in Composite Systems
    Autorzy:
    Guo, X.-Y.
    Zhang, P.
    Xu, J.-J.
    Wang, Z.-H.
    Jiao, Q.-J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358032.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    polymorphic transition
    kinetics
    activation energy
    transition temperature
    Opis:
    In order to explore the polymorphic transition law for ε-CL-20 in composite systems, the polymorphic transition process of pure ε-CL-20 crystals stimulated by heat was investigated by the X-ray Diffraction (XRD) method, and the kinetic parameters of the polymorphic transition process were calculated (including the apparent activation energy Ea and the pre-exponential factor lnA). Meanwhile the effects of different additives on the polymorphic transition process and kinetics of ε-CL-20 were explored in detail. The experimental results showed that the ε-form tends to transform into the γ- form on heating and that the Ea and lnA for the transition process were 209.97 kJ/mol and 57.47, respectively. The first group of additives clearly promoted the polymorphic transition of ε-CL-20 and lowered the initial transition temperature and the activation energy. The second and third groups of additives inhibited the polymorphic transition of ε-CL-20 and raised the initial transition temperature and the activation energy.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 4; 689-702
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    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:
    Kinetic research of quinoline, pyridine and phenol adsorption on modified coking coal
    Autorzy:
    Sun, X.
    Xu, H.
    Wang, J.
    Ning, K.
    Huang, G.
    Yu, Y.
    Ma, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/110365.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption kinetics
    modification
    coking coal
    coking wastewater
    Opis:
    Adsorption is widely used in wastewater treatment. In this work, the removal of quinoline, pyridine and phenol from coking wastewater by using modified coking coal, which was treated by four different modification methods i.e. acidification sodium hydroxide (5 mol/dm3), hydrochloric acid (5 mol/dm3) and acetic acid (5 mol/dm3) and low-temperature (105 oC) oxidation, was investigated. The modified coal was characterized by the surface area analysis, SEM, total acidity and basicity and FT-IR. The results showed that the surface area from high to low follows the order: modification with acetic acid, modification with hydrochloric acid, raw coal, modification with sodium hydroxide and modification with low-temperature. Experimental data were fitted to pseudo-first-order, pseudo-second-order and intra-particle diffusion. The adsorption of all followed pseudo-second-order kinetics. The result showed that the removal efficiency of coal modified by hydrochloric acid and acetic acid are higher than raw coal, while modified by sodium hydroxide and low-temperature are lower than raw coal., The coal modified by hydroxide acid had the best adsorption capacity.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 965-974
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    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:
    Identification of medicinal plant Schisandra chinensis using a potential DNA barcode ITS2
    Autorzy:
    Li, X.-K.
    Wang, B.
    Han, R.-C.
    Zheng, Y.-C.
    Yin, H.-B.
    Xu, L.
    Zhang, J.-K.
    Xu, B.-L.
    Powiązania:
    https://bibliotekanauki.pl/articles/56996.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    identification
    internal transcribed spacer
    medicinal plant
    Schisandra chinensis
    DNA barcode
    Opis:
    To test whether the internal transcribed spacer 2 (ITS2) region is an effective marker for using in authenticating of the Schisandra chinensis at the species and population levels, separately. And the results showed that the wild populations had higher percentage of individuals that had substitution of C→A at site 86-bp than the cultivated populations. At sites 10-bp, 37-bp, 42-bp and 235-bp, these bases of the Schisandra sphenanthera samples differed from that of S. chinensis. Two species showed higher levels of inter-specific divergence than intra-specific divergence within ITS2 sequences. However, 24 populations did not demonstrate much difference as inter-specific and intra-specific divergences were concerned. Both S. chinensis and S. sphenanthera showed monophyly at species level, yet the samples of different populations shown polyphyly at population level. ITS2 performed well when using BLAST1 method. ITS2 obtained 100% identification success rates at the species level for S. chinensis, with no ambiguous identification at the genus level for ITS2 alone. The ITS2 region could be used to identify S. chinensis and S. sphenanthera in the “Chinese Pharmacopoeia”. And it could also correctly distinguish 100% of species and 100% of genera from the 193 sequences of S. chinensis. Hence, the ITS2 is a powerful and efficient tool for species identification of S. chinensis.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2013, 82, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Scintillation Properties of $Bi_{4}(Ge_{x}S_{1-x})_{3}O_{12}$ Single Crystal
    Autorzy:
    Xiao, X.
    Xu, J.
    Lu, B.
    Cai, W.
    Zhang, Y.
    Shen, H.
    Yang, B.
    Xiang, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399369.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Fq
    61.05.C-
    78.20.Ci
    78.70.Ps
    Opis:
    The solid solution crystals, $Bi_{4}(Ge_{x}Si_{1-x})_{3}O_{12}$ (BGSO) with x=0, 0.05, and 0.15, have been grown by the modified vertical Bridgman method. The as-grown crystals show 80% of transmittance with an absorption edge of 285 nm. The relative light yields of BGSO crystals are found to be 7.2%, 6.3%, and 4.2% of CsI(Tl) crystal for x=0, 0.05, and 0.15, respectively. The energy resolutions of these crystals are 18.9%, 21.3%, and 24.7%, respectively, with PMT for 662 keV gamma rays at room temperature when exposed to $\text{}^{137}Cs$ γ -ray. The scintillation performance of BGSO crystals clearly deteriorates with the increase of Ge content. However, the appropriate number of germanium ions doped to BSO crystal can improve its crystallization behavior and effectively restrain component segregation. It is expected that large size crystals of BGSO will be grown and applied to the dual readout calorimeter in the nearest future.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 854-858
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    Identification, evaluation, and application of the genomic-SSR loci in ramie
    Autorzy:
    Luan, M.-B.
    Yang, Z.-M.
    Zhu, J.-J.
    Deng, X.
    Liu, C.-C.
    Wang, X.-F.
    Xu, Y.
    Sun, Z.-M.
    Chen, J.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/57981.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    To provide a theoretical and practical foundation for ramie genetic analysis, simple sequence repeats (SSRs) were identified in the ramie genome and employed in this study. From the 115 369 sequences of a specific-locus amplified fragment library, a type of reduced representation library obtained by high-throughput sequencing, we identified 4774 sequences containing 5064 SSR motifs. SSRs of ramie included repeat motifs with lengths of 1 to 6 nucleotides, and the abundance of each motif type varied greatly. We found that mononucleotide, dinucleotide, and trinucleotide repeat motifs were the most prevalent (95.91%). A total of 98 distinct motif types were detected in the genomic-SSRs of ramie. Of them, The A/T mononucleotide motif was the most abundant, accounting for 41.45% of motifs, followed by AT/TA, accounting for 20.30%. The number of alleles per locus in 31 polymorphic microsatellite loci ranged from 2 to 7, and observed and expected heterozygosities ranged from 0.04 to 1.00 and 0.04 to 0.83, respectively. Furthermore, molecular identity cards (IDs) of the germplasms were constructed employing the ID Analysis 3.0 software. In the current study, the 26 germplasms of ramie can be distinguished by a combination of five SSR primers including Ibg5-5, Ibg3-210, Ibg1-11, Ibg6-468, and Ibg6-481. The allele polymorphisms produced by all SSR primers were used to analyze genetic relationships among the germplasms. The similarity coefficients ranged from 0.41 to 0.88. We found that these 26 germplasms were clustered into five categories using UPGMA, with poor correlation between germplasm and geographical distribution. Our study is the first large-scale SSR identification from ramie genomic sequences. We have further studied the SSR distribution pattern in the ramie genome, and proposed that it is possible to develop SSR loci from genomic data for population genetics studies, linkage mapping, quantitative trait locus mapping, cultivar fingerprinting, and as genetic diversity studies.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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