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    Wyświetlanie 1-13 z 13
    Tytuł:
    Energy feature of a multi-flow column flotation process
    Autorzy:
    Cheng, G.
    Yu, Y.
    Ma, L.
    Xia, W.
    Xu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/109768.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation column
    turbulent kinetic energy
    turbulent dissipation rate
    bubble
    Opis:
    A cyclonic-static micro-bubble flotation column (FCSMC) has been widely used in mineral separation. FCSMC includes countercurrent, cyclone and jet flow mineralization zones in a single column. In this study, the energy feature of the three different zones was compared. The turbulent flow was evaluated in terms of the turbulent kinetic energy (k) and the turbulent dissipation rate (ε). An appropriate computing model was determined by comparing the flow field value measured by PIV with the results of the Fluent numerical simulation. Jet flow separation exhibited the maximum k and ε values among the three columns, whereas counter-current separation displayed the minimum values. The high circulating volumetric flowrate means great energy input and turbulent intensity. The higher turbulent dissipation rate, the smaller the bubble is. The better performance of the FCSMC was mainly attributed to the multiple mineralization steps. The floatability of mineral particles gradually decreases with an increase in flotation time, the mineralization energy gradually increased to overcome the decrease in mineral floatability. By contrast, the countercurrent was beneficial for recovering the coarse particles, and the jet flow was beneficial for recovering the fine particles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1266-1284
    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:
    Transcriptomic analysis of different tissues in Korean arborvitae
    Autorzy:
    Mu, H.
    Gao, Y.
    Cheng, F.
    Lin, L.
    Wang, G.
    Xia, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077762.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Thuja koraiensis
    transcriptome
    tissue specific
    Opis:
    Korean arborvitae (Thuja koraiensis) is an evergreen shrub or small tree native to Korea and the extreme Changbai Mountain of China threatened by habitat loss. Due to the limited genomic sources of Ko- rean arborvitae, it is important to explore transcriptome to understand this economically important plant. We used RNA-seq technology to characterize the transcriptome of root, stem and leaf in Korean arborvitae, respectively. Based on the bioinformatics analysis of assembled transcriptome data, transcriptional path- ways and differentially expressed genes (DEGs) were identified. There were 152.26 million reads generated, and 446,568 unigenes with a mean size of 423.51 nt obtained via de novo assembly. Of these, 204,091 unigenes (45.70%) were further annotated by comparison to public protein databases. A total of 63,495 unigenes (14.22%) were associated into 130 pathways by searching against the KEGG database. DEGs analysis identified 11,890, 5,900 and 10,136 DEGs from the comparison of root vs. stem, root vs. leaf and stem vs. leaf, respectively. Besides, photosynthesis, plant hormone signal transduction and metabolism and biosynthesis of sugar and amino acids were changed in different tissues. We obtained 446,568 unigenes in Korean arborvitae and 11,890, 5,900 and 10,136 DEGs from the compar- ison of root vs. stem, root vs. leaf and stem vs. leaf, respectively. These results will aid in understanding and carrying out future studies on the molecular basis of Korean arborvitae and contribute to future artificial production and applications.
    Źródło:
    Dendrobiology; 2019, 81; 31-39
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effects of Epoxidized Acrylated Castor Oil (EACO) on Soft Poly (vinyl chloride) Films as a Main Plasticizer
    Autorzy:
    Song, F.
    Xia, H.
    Jia, P.
    Zhang, M.
    Hu, L.
    Zhou, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/777906.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Castor Oil
    Poly(vinyl chloride)
    Epoxy Plasticizer
    Thermal Property
    Migration Resistance
    Opis:
    In this work, an environmentally friendly type plasticizer was introduced. The synthesis consisted of two steps. In the first step, castor oil (CO) was acrylated and then the acrylated castor oil (ACO) was epoxidized with the presence of formic acid and hydrogen peroxide in the second step. The epoxidized acrylated castor oil (EACO) was characterized by FTIR and  1H-NMR techniques. The EACO was used as a main plasticizer to obtain plasticized PVC materials and compared with DOP. The results showed that EACO improved polyvinyl-chloride (PVC) plasticization performance and reduced Tg from 81.06°C to 1.40°C. Plasticized PVC materials with EACO showed similar mechanical properties and better thermal stability than DOP. EACO had better volatility stabilities, migration and solvent extraction in PVC than DOP. EACO can be used to replace DOP to prepare soft films.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 4; 13-19
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on Irreversible Expansion of 1,3,5-Triamino-2,4,6-trinitrobenzene Cylinder
    Autorzy:
    Sun, J.
    Kang, B.
    Zhang, H.
    Liu, Y.
    Xia, Y.
    Yao, Y.
    Liu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/357936.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    TATB
    irreversible expansion
    XRD
    lattice parameters
    Opis:
    In this study, the irreversible expansion of TATB cylinder is investigated. No evident variation of the lattice parameters is observed on TATB crystal. The density of TATB powder decreases by only about 0.02% after it suffered from thermal cycling process at the range from -54 C to 74 C, while the density of TATB cylinder decreases by about 1.0%. It is suggested that the density variation of TATB powder has little contribution to the density decrease of TATB cylinder. Therefore, the increasing interstices between TATB powder originated from the thermal cycling should be responsible to the irreversible expansion of TATB cylinder.
    Źródło:
    Central European Journal of Energetic Materials; 2011, 8, 1; 69-79
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Spectral Characterization of the S-Clique Extension of the Triangular Graphs
    Autorzy:
    Tan, Ying-Ying
    Koolen, Jack H.
    Xia, Zheng-Jiang
    Powiązania:
    https://bibliotekanauki.pl/articles/31564711.pdf
    Data publikacji:
    2020-05-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    co-edge-regular graph
    triangular graph
    s-clique extension
    Opis:
    A regular graph is co-edge regular if there exists a constant µ such that any two distinct and non-adjacent vertices have exactly µ common neighbors. In this paper, we show that for integers s ≥ 2 and n large enough, any co-edge-regular graph which is cospectral with the s-clique extension of the triangular graph T (n) is exactly the s-clique extension of the triangular graph T (n).
    Źródło:
    Discussiones Mathematicae Graph Theory; 2020, 40, 2; 663-676
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Serological surveillance of avian influenza virus and canine distemper virus in captive Siberian Tigers in Northeastern China
    Autorzy:
    Wang, K.
    Wang, H.
    Feng, N.
    Zhao, Y.
    Gao, Y.
    Hu, G.
    Xia, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087698.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    influenza A virus
    canine distemper virus
    serological
    Siberian Tiger
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 3; 491-495
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Experiment on the Compact, Portable Pulse Forming Line
    Autorzy:
    Xia, L.
    Shi, J.
    Chen, D.
    Zhang, H.
    Zhang, L.
    Deng, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807991.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.70.+p
    77.90.+k
    Opis:
    Some research has been done on making the compact, portable pulse forming line. A kind of ceramic and a kind of newly developed composite polymer are both used as the dielectric of the planar pulse forming line. The ceramic's dielectric constant ranges from 200 to 600 and the composite polymer's dielectric constant ranges from 100 to 200. It is easier to manufacture the large composite polymer dielectric bulks than to manufacture the ceramic bulks. In the experiments, using the large composite polymer bulk as the dielectric, the planar Blumlein line generated the pulse up to 100 kV with duration 90 ns. Using the ceramic bulk as the dielectric, the planar line generated the voltage pulse up to 60 kV with duration 92 ns.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1192-1193
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Colloidal crystal cladded microfiber for refractive index sensing
    Autorzy:
    Yan, H. T.
    Zhao, X Y
    Zhang, Ch.
    Zhen, Z Q
    Li, Q Z
    Cao, J X
    Xia, L X
    Powiązania:
    https://bibliotekanauki.pl/articles/174902.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    microfibers
    colloidal crystals
    refractive index sensing
    Opis:
    We investigate the evanescent field of a microfiber wrapped by colloidal crystals. The microfiber has the diameter of about 1 μm that is drawn from a single-mode fiber with an alcohol lamp. The colloidal spheres are further attached to the microfiber through thermal evaporation, then they self-assemble to crystal-like structures. The 400 nm, 590 nm, and 710 nm-diameter SiO2 colloidal spheres are used, respectively. The spectral responses are studied theoretically and experimentally, and the results agree with each other. It is revealed that the evanescent field of a microfiber could be modulated by the photonic band-gap of colloidal crystals. This characteristic is very useful in refractive index sensing for liquids.
    Źródło:
    Optica Applicata; 2014, 44, 2; 309-315
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rozkład stężenia objętościowego cząstek stałych w przekroju poprzecznym kwadratowego przewodu podczas hydrotransportu mieszaniny gruboziarnistej
    Distribution of solid volume concentration in the cross-section of a square conduit during hydrotransport of a coarse mixture
    Autorzy:
    Yao, N.
    Qiu, H.
    Xia, J.
    Sobota, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/236824.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
    Tematy:
    hydrotransport
    mieszanina gruboziarnista
    rozkład stężenia cząstek
    przekrój kwadratowy
    core mixtures
    particle concentration distributions
    square cross section
    Opis:
    Na podstawie analizy sił działających podczas przepływu mieszaniny ciecz-cząstki piasku oraz wprowadzając parametr k, uzyskano formułę do obliczania położenia strefy maksymalnego stężenia objętościowego cząstek stałych w pionowej osi przekroju poprzecznego przewodu. Formuła została ustalona na podstawie badań przepływu mieszaniny gruboziarnistej o stężeniu objętościowym 5%, zawierającej ziarna piasku o średnicach 0,5 mm, 1,0 mm lub 3,0 mm, w przewodzie o przekroju kwadratowym (50 mm×50 mm), przy trzech prędkościach przepływu – 1,5 m/s, 2,0 m/s i 2,5 m/s. Profile stężenia cząstek w przekroju poprzecznym przewodu określono wykorzystując metodę PIV (particle image velocimetry). Weryfikacja zaproponowanej formuły, otrzymanej na podstawie wyników badań przepływu w przewodzie kwadratowym wykazała, że z wystarczającą dokładnością może być ona stosowana do analizy hydrotransportu mieszanin gruboziarnistych w rurociągach.
    A formula for calculating the location of maximum solid particle volume concentration zone on the vertical axis of the transverse conduit profile was obtained from analysis of forces acting during the flow of liquid-sand particle mixture as well as by the parameter k introduction. The formula was determined on the basis of flow test results for the 5% coarse mixture (vol.) containing sand grains of 0.5 mm, 1.0 mm and 3.0 mm in diameter in a 50 × 50 mm square conduit, at three flow velocities: 1.5 m/s, 2.0 m/s and 2.5 m/s. The transverse concentration profiles were measured using the PIV (particle image velocity) method. Verification of the proposed formula, obtained from the results of the flow tests in the square conductors, showed that with sufficient accuracy it can be applied to the analysis of coarse mixture flows in the pipelines.
    Źródło:
    Ochrona Środowiska; 2018, 40, 3; 47-52
    1230-6169
    Pojawia się w:
    Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of three species commonly known as“daqingye” by internal leaf anatomy and high-performance liquid chromatography analyses
    Autorzy:
    Zhang, Y.
    Zhu, Y.
    Chen, J.
    Xia, C.
    Deng, J.
    Li, H.
    Li, Y.
    Li, J.
    Liu, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/59301.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    The macroscopic and microscopic morphologies and indigo and indirubin concentration of the traditional Chinese medicine herbs Isatis indigotica Fort., Polygonum tinctorium Ait., and Baphicacanthus cusia (Nees) Bremek, all commonly known as “daqingye”, were determined and compared. The morphological analyses indicated that I. indigotica has leaves with winged petioles and no glandular hairs or crystals, P. tinctorium has leaves with membranous ocrea and clusters of calcium oxalate, and B. cusia has palisade cells in the mesophyll running over the main vein and single cells containing calcium carbonate crystals. Indigo and indirubin are chemical constituents that have been previously isolated from daqingye and were selected in this study as identification markers for high-performance liquid chromatography analysis due to their pharmacological activities. The chromatographic results showed that indigo and indirubin concentration varied significantly among the three species: high concentration of both indigo and indirubin were observed in I. indigotica, the highest concentration among the three daqingye plants was found in P. tinctorium but with low levels of indirubin, and the concentration of indigo and indirubin was quite low in B. cusia. In summary, three different species commonly known as daqingye were accurately distinguished by morphological observation, internal leaf anatomy analysis, and chromatographic analysis.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2018, 87, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pharmacokinetics of the recombinant ovine interferon-tau in lambs
    Autorzy:
    Zhao, J.
    Yu, H.Y.
    Zhao, Y.
    Li, S.Q.
    Fu, X.L.
    Zhou, W.
    Xia, B.B.
    Wang, M.L.
    Chen, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087588.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bioavailability
    ovine interferon-τ
    cytopathic effect inhibition assay
    pharmacokinetic study
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 1; 75-82
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization properties of Gaussian–Schell model quantization field in a turbulent marine-atmosphere
    Autorzy:
    Zhao, Y.
    Xia, M.
    Wang, Q.
    Li, Y.
    Hu, Z.
    Sun, H.
    Zhang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/173639.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    polarization fluctuation
    Gaussian–Schell model
    marine-atmosphere
    Kolmogorov turbulence
    Opis:
    Polarization properties of Gaussian–Schell model quantization field propagating through the Kolmogorov turbulence of a marine-atmosphere channel are studied based on the degree of quantum polarization. The effective photon annihilation and creation operators of Gaussian–Schell model quantization field propagation in a marine-atmosphere are developed by making use of the extended Huygens–Fresnel integral of quantum field. The effects of the outer scale on the degree of polarization can be neglected. As the source transverse coherent width, the number of received photons, the inner scale of turbulent eddies, and the source transverse radius decrease or the re- fractive index structure parameter increases, the degree of polarization decreases. In theory, we find that the polarization fade of marine-atmosphere turbulence channels is larger than that of terrene-atmosphere turbulence channels under same transport parameters and the channel with a stronger turbulence strength will possess a larger detection area of a polarization signal, which have potentially important implications for free-space quantum key distribution.
    Źródło:
    Optica Applicata; 2016, 46, 3; 335-345
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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