Wyniki wyszukiwania - BazTech

1

Magnified holographic projection based on spatial light modulators

Su Y., Cai Z., Shi L., Zhou F., Chen H., Wu J.

Optica Applicata

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2018

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Vol. 48, nr 4

589--600

EN

In this paper, a magnified holographic projection based on spatial light modulators is proposed and implemented by combining four magnification methods, including similarity principle of Fourier transform, spatial division, digital lens, and image splicing methods. The Fourier holographic display system is constructed for the experimental verification of the proposed methods. With such four methods of holographic magnification, the reconstruction image can be magnified to 10 × 5 times in two-dimensional directions, which is verified by the experiments. Furthermore, the undesirable light of holographic projection is eliminated by encoding the linear phase onto the computer-generated holograms. The experimental results prove that the proposed system can realize magnified holographic projection with good reconstructed quality, which provides a promising potential for the dynamic holographic projector.

2

Spiking Neural P Systems with Rules on Synapses Working in Sum Spikes Consumption Strategy

Su Y., Wu T., Xu F., Păun A.

Fundamenta Informaticae

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2017

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Vol. 156, nr 2

187--208

EN

Spiking neural P systems with rules on synapses (RSSN P systems, for short) are a class of distributed and parallel computation models inspired by the way in which neurons process and communicate information with each other by means of spikes, where neurons only contain spikes and the evolution rules are on synapses. RSSN P systems have been proved to be Turing universal, using the strategy that restricts all the applied rules to consume the same number of spikes from the given neuron, termed as equal spikes consumption strategy. In this work, in order to avoid imposing the equal spikes consumption restriction on the application of rules, a new strategy for rule application, termed as sum spikes consumption strategy, is considered in RSSN P systems, where a maximal set of enabled rules from synapses starting from the same neuron is nondeterministically chosen to be applied, in the sense that no further synapse can use any of its rules, and the sum of these numbers of spikes that all the applied rules consume is removed from the neuron. In this way, the proposed strategy avoids checking whether all the applied rules consume the same number of spikes from the given neuron. The computation power of RSSN P systems working in the proposed strategy is investigated, and it is proved that such systems characterize the semilinear sets of natural numbers, i.e., such systems are not universal. Furthermore, RSSN P systems with weighted synapses working in the proposed strategy are proved to be Turing universal. These results show that the weight on synapses is a powerful ingredient of RSSN P systems in terms of the computation power, which makes RSSN P systems working in sum spikes consumption strategy become universal from non-universality.

3

Parameter Description of the Surface Metal Fiber Arrangement of Electromagnetic Shielding Fabric

Liu Z., Su Y., Pan Z., Li Y., Wang X., Zhou Z.

Fibres & Textiles in Eastern Europe

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2017

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Vol. 25, no. 2 (122)

62--67

EN

The influence of the surface metal fiber (SMF) arrangement on the shielding effectiveness (SE) of electromagnetic shielding fabric (EMSF) is important, but there is no reasonable description method for it at present, making the further exploration of the relationship between SMF and SE difficult. In order to scientifically describe the SMF arrangement of EMSF, this paper constructs a binary feature matrix of SMF based on a previous study of SMF region recognition. According to the feature matrix, three parameters of the exposure ratio, the discrete mean and disorder degree are proposed and the calculation equations for the three parameters given. Experiments were designed and testing samples determined to test the SE, and the exposure ratio, discrete mean and disorder degree of each sample are calculated. The relationship between the three parameters and the SE is analysed for effectiveness validation of the three parameters. Results show that the exposure ratio, discrete mean and disorder degree can describe three aspects of the SMF arrangement: the percentage content, porosity and orientation, which are positively correlated, negatively correlated and positively correlated to the SE, respectively. The research in this paper provides a basis for the study of the shielding mechanism, the transmission model, the shielding rule and the rapid non-destructive evaluation of the EMSF, and puts forward a new idea for the study of shielding theory and the application of the EMSF.

PL

Ze względu na istotny wpływ rozmieszczenia włókien metalowych (SMF) na skuteczność ekranowania (SE) tkanin osłonowych (EMSF) w pracy przedstawiono macierz binarną opartą na trzech parametrach włókien metalowych tj.: współczynniku ekspozycji, średniej wartości odległości między włóknami metalowymi i stopniu ich nieuporządkowania. Analizowano zależności pomiędzy wyżej wymienionymi parametrami a skutecznością ekranowania. Przedstawione wyniki stanowią podstawę do opracowania szybkiej i nieniszczącej metody oceny skuteczność ekranowania oraz do dalszych badań mechanizmu ekranowania.

4

Coupling mechanism and coupling degree measurement model of shipbuilding industry cluster

Su Y., Wang F., An X.

Polish Maritime Research

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2016

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S 1

78--85

EN

This article was aimed to analyse the working condition of the coupling mechanism in Chinese shipbuilding industry cluster. Literature review was conducted to unveil the coupling mechanism of shipbuilding industry cluster, providing analysis of the present development of shipbuilding industry. A theoretical model was proposed by using the efficacy function and the capacity of the coupling coefficient while measuring the coupling of the shipbuilding industry cluster. Four coupling characteristics were found including relevant, systemic, diversity, and collaborative in the shipbuilding industry cluster. The shipbuilding industry cluster has two levels of coupling mechanism including the core layer coupling mechanism and the support layer coupling mechanism respectively. The improvement through coupling the core layer, support layer, and the coupling between two levels, is an effective way to achieve long-term stable development in Chinese shipbuilding industry cluster.

5

Improving the stability of discretization zeros with the Taylor method using a generalization of the fractional-order hold

Zeng C., Liang S., Zhang Y., Zhong J., Su Y.

International Journal of Applied Mathematics and Computer Science

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2014

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Vol. 24, no. 4

745--757

EN

Remarkable improvements in the stability properties of discrete system zeros may be achieved by using a new design of the fractional-order hold (FROH) circuit. This paper first analyzes asymptotic behaviors of the limiting zeros, as the sampling period T tends to zero, of the sampled-data models on the basis of the normal form representation for continuous-time systems with a new hold proposed. Further, we also give the approximate expression of limiting zeros of the resulting sampled-data system as power series with respect to a sampling period up to the third order term when the relative degree of the continuous-time system is equal to three, and the corresponding stability of the discretization zeros is discussed for fast sampling rates. Of particular interest are the stability conditions of sampling zeros in the case of a new FROH even though the relative degree of a continuous-time system is greater than two, whereas the conventional FROH fails to do so. An insightful interpretation of the obtained sampled-data model can be made in terms of minimal intersample ripple by design, where multirate sampled systems have a poor intersample behavior. Our results provide a more accurate approximation for asymptotic zeros, and certain known results on asymptotic behavior of limiting zeros are shown to be particular cases of the ideas presented here.

6

Overhead Line Fault Section Positioning System Based on Wireless Sensor Network

Dong A., Geng X., Yang Y., Su Y., Li M.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 3b

60--61

EN

This paper introduces overhead line fault detection and location system as the core of industrial control computer. The combination of software and hardware, the methods of current rate of change and zero current detection are used, and so the accuracy of short circuit fault detection is improved. The features of ground phase voltage drop and the 5th harmonic current are integrated. Zigbee wireless chips are used to make into independent signal transmission system. The system has been put into operation, running in good condition.

PL

W artykule przedstawiono system detekcji i lokalizacji awarii w sieci napowietrznej do implementacji w komputerze przemysłowym. W metodzie brana jest pod uwagę m. in. wielkość zmian prądu oraz obecność prądu kolejności zerowej, co poprawiło dokładność wykrywania awarii. Zastosowano także bezprzewodowe łącze Zigbee w celu zwiększenia niezależności przesyłu sygnałów w systemie. Badania potwierdziły poprawność działania.

7

Dispersion-compensating en/decoder for a time-spreading/wavelength-hopping optical code-division multiplexing (OCDM) system

Zheng J., Wang R., Pu T., Lu L., Fang T., Su Y., Li L., Yang Q., Chen X.

Optica Applicata

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2013

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Vol. 43, nr 3

485--495

EN

A novel dispersion-compensating fiber Bragg grating (FBG)-based en/decoder is proposed to compensate both the out-band and in-band dispersion in a time-spreading/wavelength-hopping (TS/WH) optical code-division multiplexing (OCDM) system. The experimental realization of such en/decoders only needs a uniform-pitch phase mask and a sub-micrometer precision moving stage. Such an en/decoder pair with the ability of compensating the dispersion of transmission in 20-km single mode fiber (SMF) is simulated and experimentally fabricated. Both the simulation and experimental results show that the decoded pulse can be recovered without any distortion owing to the elimination of dispersion.

8

Effects of synthesis conditions on the synthesis of carbon nanofibers by ethanol catalytic combustion

Cheng J., Zou X. P., Zhu G., Wang M. F., Su Y., Yang G. Q., Lu X. M.

Archives of Metallurgy and Materials

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2012

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Vol. 57, iss. 3

745-751

EN

In this paper, the effects of position of substrates in flames, preparation time, stability of flames and catalyst precursors on the synthesis of carbon nanofibers (CNFs) by ethanol catalytic combustion (ECC) were investigated. For investigating the effects of these influence factors on the synthesis of CNFs, several sets of controlled experiments were performed, such as preparation experiments with different position of substrates in flames, different preparation time, stable and unstable flames, and different catalyst precursors. In our experiments, the catalyst precursors were iron nitrate, cobalt nitrate, nickel nitrate, and iron chloride, cobalt chloride, nickel chloride. The as-synthesized products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. Our results indicate that the optimal position of substrates in flames is more than 1cm and less than 2.5cm, the optimal preparation time is more than 5min and less than 30min for massive yield, stable flames would be tent to synthesize CNFs with mainly single-type morphology and could improve the graphitization of CNFs, and the catalyst precursors obviously have effects on the synthesis of CNFs.

PL

W niniejszej pracy zbadany został wpływ położenia substratów w płomieniach, czasu przygotowania, stabilności płomieni i prekursorów katalizatora na syntezę nanowłókien węglowych (CNFs) metodaą katalitycznego spalania etanolu (ECC). W celu zbadania wpływu tych czynników na syntezę nanowłókien węglowych przeprowadzono kilka zestawów kontrolowanych eksperymentów, przy różnej pozycji podłoży w płomieniach, różnym czasie przygotowania, płomieniach stabilnych i niestabilnych i przy użyciu różnych prekursorów katalizatora. W naszych eksperymentach jako prekursory katalizatora stosowano azotany: żelaza, kobaltu i niklu oraz chlorki żelaza, kobaltu i niklu. Tak otrzymane produkty syntezy scharakteryzowano za pomocą skaningowej mikroskopii elektronowej (SEM), transmisyjnej mikroskopii elektronowej (TEM) i spektroskopii Raman'a. Nasze wyniki wskazują, że optymalna pozycja podłoży w płomieniach to więcej niż 1 cm i mniej niż 2,5 cm, a optymalny czas przygotowania to więcej niż 5 min i mniej niż 30 min dla dużej wydajności. Stabilność płomieni będzie sprzyjać syntezie nanowłókien o morfologii jednego typu i może poprawić ich grafityzacje, a rodzaj prekursora katalizatora ma wpływ na syntezę nanowłókien.

9

Higher-order space charge field effects on the self-deflection of bright screening spatial solitons in two-photon photorefractive crystals

Jiang Q., Su Y., Ji X.

Optica Applicata

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2010

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Vol. 40, nr 2

481--490

EN

We investigate the effects of higher-order space charge field on the self-deflection of bright screening spatial solitons due to two-photon photorefractive effects by a numerical method under steady-state conditions. The expression for an induced space charge electric field including higher-order space charge field terms is obtained. Numerical results indicate that bright screening solitons undergo self-deflection process during propagation, and the solitons always bend in the opposite direction of the c axis of the crystal. The self-deflection of bright screening solitons can experience considerable increase especially in the regime of high bias field strengths. Relevant examples are provided.

10

Approximation for fixed points of strict pseudo-contractions and solutions of equilibrium and optimization problems

Kang J., Su Y., Zhang H.

Journal of Applied Analysis

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2010

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Vol. 16, nr 1

1-13

EN

In this paper, we introduce some iterative schemes for findin a common element of the set of fixed points of a k-strict pseudo-contractive mapping, the set of solutions of the variational inequality and the set of solutions of an equilibrium problem in a Hilbert space. The authors use the convex combination technique to show that the iterative sequences converge strongly to a common element of the three sets. The results of this paper extend and improve the results of Y. Su et al. [9], S. Plubtieng and R. Punpaeng [7], X. Qin et al. [8] and S. Takahashi and W. Takahashi [10].

11

Strict pseud-contraction strong convergence theorems for strict pseud-contractions

Qin X., Su Y.

Journal of Mathematics and Applications

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2008

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Vol. 30

137-149

EN

In this paper, we prove two strong convergence theorems for strict pseudocontractions in Hilbert spaces by hybrid methods. Our results extend and improve the recent ones announced by Nakajo and Takahashi [K. Nakajo, W. Takahashi,. Strong convergence theorems for nonexpansive mappings and nonexpansive semigroups, J. Math. Anal. Appl. 279 (2003), 372-379], Marino and Xu [G. Marino, H.K. Xu, Weak and strong convergence theorems for strict pseudo-contractions in Hilbert spaces, J. Math. Anal. Appl. 329 (2007), 336-346], Martinez-Yanes and Xu [C. Martinez-Yanes, H.K. Xu, Strong convergence of the CQ method for fixed point iteration processes, Nonlinear Anai. 64 (2006), 2400-2411] and some others.

12

Synthesis and characterization of SiO2 and SiC micro/nanostructures

Zhu G., Zou X. P., Cheng J., Su Y.

Archives of Metallurgy and Materials

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2008

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Vol. 53, iss. 3

727-734

EN

Silica-based nanowires, straight nanorods, straight Y-shaped słlica nanorods, flower-like microstructures, and SiC/Si02 core-shell coaxial nanocables have been generated through a simple thermal evaporation method. The synthesized samples were characterized by means ot" scanning electron microscopy, transmission electron microscopy, high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, and Raman spectrum. Generated silica nanowires with a diameter of about lOOnm and length of up to several tens of micrometers, straight silica nanorods and Y-shaped nanorods with a diameter about 50-200nm, and novel flower-like silica microstructures all are amorphous and consist only of silicon oxide, and have a neat smooth surface. Generated SiC/SiO? core-shell coaxial nanocables have a crystalline core and a surrounding amorphous layer. The results show that the present method should be possible to synthesis various micro/nanostructures under appropriate experimental conditions. These nanostructures may find applications as building blocks in nanomechanical or nanoelectronic devices.

PL

Nanodruty na podłożu Si02, proste (straight) nanopręty, krzemionkowe nanopręty w kształcie litery Y, mikrostruktury kwiatowe, SiC/Si02 rdzeniowo-powłokowe kable koncentryczne zostały wytworzone przy zastosowaniu prostej metody odparowania cieplnego. Poddane syntezie próbki scharakteryzowano przy pomocy skaningowej mikroskopii elektronowej, transmisyjnej mikroskopii elektonowej, wysoko rozdzielczej transmisyjnej mikroskopii elektronowej, rentgenospektroskopii z dyspresją energii widma oraz widmaRaman'a. Wytworzone krzemionkowe mikrodruty o średnicy około lOOnm oraz długości dochodzącej do kilkudziesięciu mikrometyrów, proste (straight) krzeminokowe nanopręty oraz nanopręty w kształcie litery Y o średnicy około 50-200nm jak również krzemionkowe mikrostruktury kwiatowe są wszystkie amorficzne i składają się jedynie z tlenku krzemowego wykazując uporządkowaną, gładką powierzchnię. Wytworzone SiC/SiOi rdzeniowo-powłokowe kable koncentryczne posiadają rdzeń krystaliczny oraz otaczają go warstwa amorficzną. Wyniki wykazują, że metoda o której mowa może być zastosowana do syntezy różnych mikro/nanostruktur przy zachowaniu odpowiednich reżimów eksperymentalnych. Nanostruktury, o których mowa, mogą znaleźć zastosowanie jako bloki konstrukcyjne w urządzeniach mechanicznych i nanoelektrycznych.

13

Preparation and characterization of bamboo-like carbon nanotubes by ethanol catalityc combustion technique

Zhu G., Zou X. P., Cheng J., Wang M. F., Su Y.

Archives of Metallurgy and Materials

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2008

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Vol. 53, iss. 3

735-740

EN

A simple combustion approach for synthesizing bamboo-Iike carbon nanotubes was proposed by using liquid ethanol flame on the substrates. Copper piąte was employed as substrate, ethanol as carbon source and fuel, and iron chloride or iron nitrate solution as catalyst precursors, respectively. The as-grown black powder was characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The results show that some carbon nanotubes with good bamboo-Iike structure were obtained in our products, and these bamboo-like carbon nanotubes have diameters of about 10-100nm and length of up to several tens of micrometers. However, the morphology and microstructure of bamboo-like carbon nanotubes are affected by synthesis conditions, such as concentration of catalyst precursor solution, synthesis temperaturę, synthesis time, and flame perturbations etc. According to observation and analysis of TEM images, we tentatively propose and discuss for the possible growth mechanism of bamboo-like carbon nanotubes. The results also show that the present method is simpler to synthesize carbon nanomaterials, such as nanotubes, carbon nanofibers, and nanoparticles etc. In addition, this method has some advantages, such as flexible synthesis conditions, simple setup, easier to be controlled, morę economic, and environment-friendly.

PL

Zaproponowano prostą metodę spalania w celu przeprowadzenia syntezy nanorurek węglowych o strukturze bambusowej przy użyciu płomienia z ciekłego etanolu na podłożu. Jako podłoże zastosowano płytkę miedzianą, etanol jako paliwo wglo-we oraz roztwów chlorku żelaza spełniających funkcje prekursora katalicznego. Powstały czarny proszek scharakteryzowano przy użyciu skaningowej mikroskopii elektronowej (SEM), transmisyjnej mikroskopii elektronowej (TEM) oraz spektroskopii Raman'a. Wyniki wskazują, że w naszych wyrobach udało się otrzymać nanorurki węglowe o silnej strukturze bambusowej o średnicy około 10 - lOOnm i długości dochodzącej do kilkudziesięciu mikrometrów. Jednakże na morfologię i mikrostrukturę tychże nanorurek wpłynęły warunki syntezy, takie jak, stężenie roztworu prekursora katalitycznego, temperatura syntezy, czas syntezy, niestabilność płomienia etc, Jak wykazały obserwacje i analiza obrazu TEM należałoby przyjrzeć się i przedyskutować możliwy mechanizm wzrostu nanorurek węglowych o bambusowej strukturze. Ponadto wyniki wskazują, że obecnie stosowana metoda syntetyzowania nanomateriałów węglowych takich jak nanorurki, nanowłókna węlowe i nanocząsteczki jest prostsza. Ponadto posiada zalety w postaci dobieralnych warunków syntezy, prostego oprzyrządowania, łatwego monitorowania, a także jeat mniej kosztowna i przyjazna środowisku.