Autor: He, M. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: On the Interaction of Resonance And Bragg Scattering Effects for the Locally Resonant Phononic Crystal with Alternating Elastic and Fluid Matrices
Autorzy:: Yuan, B.
Chen, Y.
Jiang, M.
Tang, S.
He, M.
Tu, M.
Tematy:: locally resonant phononic crystals
effective speed of sound
coupling band gaps
underwater acoustic materials; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177103.pdf Link otwiera się w nowym oknie
Opis:: Three-dimensional (3D) locally resonant phononic crystals (LRPCs) are studied with the aim of optimising the sub-wavelength band gaps of such composites. By analysing their effective acoustic properties, it has been found that the effective acoustic speed of the composite will drop to zero when local resonance arise, and will increase monotonically when Bragg scattering effects occur. Moreover, if the matrix is a low-shear-speed medium, local resonators can significantly reduce the effective acoustic speed of the composite and, therefore, lower the frequency where Bragg scattering effects occur. Hence, a specific LRPC with alternating elastic and fluid matrices is proposed, whose resonance and Bragg gaps are already close in frequency. The fluid matrix behaves as a wave filter, which prevents the shear waves from propagating in the composite. By using the layer-multiple-scattering theory, the coupling behaviour of local resonance and Bragg scattering band gaps has been investigated. Both gaps are enhanced when they move closer to each other. Finally, a gap-coupled case is obtained that displays a broad sub-wavelength band gap. Such proposal excels at the application of underwater acoustic materials since the arrangement of structure can be handily adjusted for tuning the frequency of coupled gap.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Enhancing SO2 removal efficiency by lime modified with sewage sludge in a novel integrated desulfurization process
Autorzy:: Qin, L.
Han, J.
Chen, W.
Liu, Z.
He, M.
Xing, F.
Tematy:: sewage sludge
steel industry
sintering process
osad ściekowy
przemysł hutniczy
proces spiekania; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/950037.pdf Link otwiera się w nowym oknie
Opis:: In China, the sintering process annually emitted around 1.5 million t SO₂, representing 70% of SO₂ produced from the iron and steel industry. Lime based sorbent was modified with municipal sewage sludge (MSS) and the influence of the modification on the desulfurization efficiency was investigated in a laboratory-scale novel integrated desulfurization (NID) reactor. The properties of modified sorbent were characterized by the Brunauer–Emmett–Teller (BET) analyzer and X-ray fluorescence (XRD) analyzer. BET surface area was increased from 17.48 to 46.68 m²g^–1. when the MSS/lime ratio increased from 0 to 0.08. Ca₄Al₈Si₈O₃₂, Ca_1.5SiO_3.5, Na₂Si₂O₅ and CaSiO₃ found in the modified lime benefited for the increase of the BET surface area and pore volume. The effects of sewage sludge/CaO weight ratio, calcination temperature and hydration time on the desulfurization efficiency were also studied. SO₂ removal efficiency was increased from 88.7% to 97.3% after using the lime modified with sewage sludge.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Oxidative stress induced by cobalt in Jatropha curcas seedlings: response of growth and chemical changes
Autorzy:: Hu, Y.
Song, Y.
Yu, D.
Qian, W.
He, M.
Yi, L.
Gao, S.
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Powiązania:: https://bibliotekanauki.pl/articles/53687502.pdf Link otwiera się w nowym oknie
Opis:: Experiments using in vitro embryo germination and culture have been designed to investigate the effects of cobalt levels of 0, 100, 200, 400 and 800 μM on some growth parameters and chemical changes in Jatropha curcas seedlings. The results showed that excess cobalt levels in MS media produced visual symptoms of toxicity in J. curcas seedlings after 7 d with increasing levels of cobalt ion. The fresh weights of cotyledons and radicles were significantly affected except for hypocotyls at the cobalt concentration of 100 μM. The activity of superoxide dismutase (SOD) significantly increased in the radicles when compared to the control, but decreases in the activity of the hypocotyls were found at the tested cobalt levels. Increase of guaiacol peroxidase (GPX) activity in the cotyledons and hypocotyls was observed at the tested cobalt levels, but a decrease of the activity in the radicles except for at cobalt concentration of 100 μM. Increase in the activity of catalase (CAT) of radicles with increasing cobalt concentrations, and a significant decrease in activity in the hypocotyls was also observed. Increase in phenylalanine ammonia-lyase (PAL) activity of cotyledons and radicles with increasing cobalt concentrations in the range 100-800 μM, but a decline in the activity of hypocotyls was also observed when hypocotyls at the cobalt concentrations of 400 and 800 μM. The present results indicated that SOD, GPX, CAT, and PAL may play an important role in the defensive mechanisms of Jatropha curcas seedlings exposed to excessive cobalt. These findings will help to provide useful bioassays to help in assessment of cobalt contamination in agricultural environments.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Stability and Hopf bifurcation analysis for a Lotka-Volterra predator-prey model with two delays
Autorzy:: Xu, C.
Liao, M.
He, X.
Tematy:: opóźnienie
stabilność
bifurkacja Hopfa
predator-prey model
delay
stability
Hopf bifurcation; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/907822.pdf Link otwiera się w nowym oknie
Opis:: In this paper, a two-species Lotka-Volterra predator-prey model with two delays is considered. By analyzing the associated characteristic transcendental equation, the linear stability of the positive equilibrium is investigated and Hopf bifurcation is demonstrated. Some explicit formulae for determining the stability and direction of Hopf bifurcation periodic solutions bifurcating from Hopf bifurcations are obtained by using normal form theory and center manifold theory. Some numerical simulations for supporting the theoretical results are also included.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Proteins and enzymatic systems in three varieties of Helianthus annuus L.
Autorzy:: Kalinowski, A
Klimko, M.
He, L.
Kluza, M.
Tematy:: variability
Helianthus annuus
enzyme
hybrid
electrophoresis
protein
enzyme system
oil plant
isoelectric focusing; Pokaż więcej
Wydawca:: Uniwersytet Przyrodniczy w Poznaniu
Powiązania:: https://bibliotekanauki.pl/articles/878224.pdf Link otwiera się w nowym oknie
Opis:: The paper reports results of analysis of protein and eight enzymatic systems of three varieties of Helianthus annuus L. (Wielkopolski, Coril, and Frankasol) performed by three electrophoretic methods. Electrophoretic analyses allowed finding protein and isoenzymes markers for each of variety. The two interline hybrids Coril and Frankasol shared more features in common than the population variety Wielkopolski with each of the former. Mean values of the polymorphism index for the protein and the eight enzymes indicate that the variety Wielkopolski is more homogeneous than Coril and Frankasol.
W pracy przedstawiono wyniki analiz białek i ośmiu układów enzymatycznych, rozdzielanych trzema metodami elektroforezy, u trzech odmian Helianthus annuus L. (Wielkopolski, Coril i Frankasol). Elektroforetyczne analizy umożliwiły znalezienie białkowych i izoenzymatycznych markerów dla trzech odmian. U dwóch odmian międzyliniowych mieszańców Coril i Frankasol wykryto więcej cech wspólnych niQ u wymienionych odmian i odmiany Wielkopolski. Średnie wartości indeksu polimorfizmu, obliczone dla białek i ośmiu układów enzymatycznych, pokazały, że odmiana Wielkopolski była bardziej wyrównana niż odmiany Coril i Frankasol.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Josephson Junctions Like Behavior in Superconducting Nb Films with Diluted Triangular Arrays of Antidots
Autorzy:: Mumtaz, M.
He, S.
Qiu, X.
Kamran, M.
Tematy:: 74.25.F-
74.78.-w
74.81.Fa; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1192515.pdf Link otwiera się w nowym oknie
Opis:: We present current versus voltage (I-V) measurement on superconducting Nb films with diluted triangular arrays (honeycomb and kagome) of antidots. Peaks and dips appearing in the derivative (dV/dI) of I-V curves showing the variation in the resistance is the indication of Josephson Junctions like weak-links in these systems. These observations also reveal the presence of mobile interstitial vortices in these lattices with regular pinning arrays. This behavior is predominant in honeycomb arrays due to large density of interstitial spaces in this system as compared that of to kagome lattice. This behavior can be tuned by temperature as well as external magnetic field but the tuning values of these parameters can be different for different symmetries of antidots.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Design and test of a new high-current electronic current transformer with a Rogowski coil
Autorzy:: Zhang, M.
Li, K.
He, S.
Wang, J.
Tematy:: Rogowski coil
high-current
electronic current transformers
electrical measurements; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/221051.pdf Link otwiera się w nowym oknie
Opis:: This paper describes the design and test of a new high-current electronic current transformer based on a Rogowski coil. For better performances, electronic current transformers are used to replace conventional electro-magnetic inductive current transformers based on ferromagnetic cores and windings to measure high-current on the high voltage distribution grids. The design of a new high-current electronic current transformer is described in this paper. The principal schemes of the prototype and partial evaluation results are presented. Through relative tests it is known that the prototype has a wide dynamic range and frequency band, and it can allow high accuracy measurements.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Dry beneficiation and cleaning of chinese high-ash coarse coal utilizing a dense-medium gas-solid fluidized bed separator
Autorzy:: He, J.
Tan, M.
Zhu, R.
Luo, Z.
Tematy:: coal cleaning
dense-medium fluidized bed
density distribution
segregation
separation performance; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110808.pdf Link otwiera się w nowym oknie
Opis:: Dry dense-medium fluidized bed separation provides a new alternative approach for coal beneficiation and cleaning. An indicator of segregation degree Sash was proposed to evaluate the stratified performance of coal samples by bed density. Fluidization stability of the bed was greatly enhanced by mixing a certain amount (21.53%) of fine magnetite powder (< 0.15 mm) into the fluidized media, which indicated a uniform density distribution as well as slight fluctuations in bed. It was found that the favorable density-segregation performance of 3–13 mm coarse coal occurred with a static bed height of 80 mm and a superficial gas velocity of 11.84 cm/s. The optimal segregation degree values of 0.67, 0.74 and 0.76 were obtained for 3–6, 6–10 and 10–13 mm coal samples, respectively. Low-ash clean coal with yields of 50.79, 56.83 and 61.24% were effectively acquired by the dry separation for various coal size fractions, respectively. Probable error values of 0.07, 0.055 and 0.05 g/cm3 were achieved, indicating good separation performance.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: An on-site calibration system for electronic instrument transformers based on LabVIEW
Autorzy:: Zhang, M.
Li, K.
Wang, J.
He, S.
Tematy:: calibration system
electronic instrument transformers
data acquisition
data synchronization
LabVIEW; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/221656.pdf Link otwiera się w nowym oknie
Opis:: Electronic voltage transformers (EVT) and electronic current transformers (ECT) are important instruments in a digital substation. For simple, rapid and convenient development, the paper proposed an on-site calibration system for electronic instrument transformers based on LabVIEW. In the system, analog signal sampling precision and dynamic range are guaranteed by the Agilent 3458A digital multimeter, and data synchronization is also achieved based on a self-developed PCI synchronization card. To improve the measurement accuracy, an error correction algorithm based on the Hanning window interpolation FFT has good suppression of frequency fluctuation and inter-harmonics interference. The human-computer interface and analysis algorithm are designed based on LabVIEW, and the adaptive communication technology is designed based on IEC61850 9-1/2. The calibration system can take into account pairs of digital output and analog output of the electronic voltage/current transformer calibration. The results of system tests show that the calibration system can meet the requirements of 0.2 class calibration accuracy, and the actual type test and on-site calibration also show that the system is easy to operate with convenience and satisfactory stability.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Differential responses of aquatic and aerobic forms of Echinochloa crus-galli (L.) Beauv. and E. colona (L.) Link. by morpho-physiological and molecular analysis
Autorzy:: Khedr, A.-H.A.
Serag, M.M.
Shaaban, H.E.
Abogadallah, G.M.
Tematy:: alcohol dehydrogenase
ADH zob.alcohol dehydrogenase
aquatic form
aerobic form
Echinochloa crus-galli
Echinochloa colona
habitat alteration
morphophysiological analysis
molecular analysis
phosphoenolopyruvate carboxylase
Rubisco; Pokaż więcej
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Powiązania:: https://bibliotekanauki.pl/articles/9989.pdf Link otwiera się w nowym oknie
Opis:: Echinochloa crus-galli and E. colona are serious weeds around the world. Morphological and biochemical features of aquatic and aerobic forms of both species were investigated experimentally by transplanting the seedlings reciprocally between water-saturated and aerobic soils (70% field capacity). When the plants were grown in water-saturated soil, a significant decrease in tiller height was observed in E. crus-galli, but not in E. colona. Upon growing the plants in aerobic soil, internode length and spike dry weight increased significantly in E. crus-galli, but decreased significantly in E. colona. Growth under aerobic condition caused a significant increase in PEPC/Rubisco ratio, but a significant decrease was observed under water-saturated conditions. When E. crus-galli was transplanted in aerobic soil, several forms of peroxidase were upregulated. Contrarily, in E. colona peroxidase isoforms did not respond to habitat change. Gene expression of ADH in E. colona was constitutive at a fairly high level under native habitats then enhanced with reversing habitat that caused anoxic and mild drought conditions. Both species tend to grow faster under aerobic conditions by modifying the photosynthetic machinery and capacity of scavenging of reactive oxygen species. Furthermore, ADH appears to play a role in supporting growth under water-saturated conditions.
Dostawca treści:: Biblioteka Nauki

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