Wyniki wyszukiwania - Biblioteka Nauki

1

Three new synonyms among Chinese camaenid snails (Gastropoda: Eupulmonata: Camaenidae)

100%

Zhang G.

Folia Malacologica

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2019

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tom 27

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nr 1

2

Monotone solutions of a higher-order neutral differential equation

63%

Zhang G. , Migda M.

Annales Societatis Mathematicae Polonae. Seria 1: Commentationes Mathematicae

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2004

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tom Vol. 44, nr 1

147--162

EN

A continuous function x(t) is said to be (*)-monotone with a positive number τ if x(t) > 0 and (-1)n(x(t) - x(t - τ))(n) ≥ 0 for n ≥ 0. This paper is concerned with various classifications of (*)-monotone solutions of a neutral differential eąuation. Necessary and/or sufficient conditions are then derived for the existence of these solutions.

3

Novel robust control design for unstable systems with dual pole and dual zero

63%

Zhang X. , Zhang G.

Control and Cybernetics

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2013

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tom Vol. 42, no. 3

613--625

EN

In this note, a novel robust control design for a class of unstable systems with dual pole and dual zero is addressed. In the algorithm, αfeedback node was moved from the interior of the controlled plant to its right-hand side. Then, the closed-loop gain shaping algorithm was used to design the feedback transfer function. Consequently, controller and the controlled plant have clear physical meaning and are easily tuned. Simulation results show that the control effects are better than for the previous modification, the system can have rapid settling time with no overshoot, zero steadystate error and satisfactory robust stability to model perturbation and disturbance. The method has the advantages of simple and efficient design, and it was also successfully applied to control static unstable missile.

4

On connected half-linear differential equations

63%

Zhang G. , Cheng S.

Demonstratio Mathematica

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1999

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tom Vol. 32, nr 2

345-362

5

On two second order half-linear difference equations

63%

Zhang G. , Cheng S. S.

Fasciculi Mathematici

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2005

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tom Nr 35

163-175

EN

In this paper, two second order half-linear difference equations are considered. By establishing their connections with a standard half-linear difference equation, we are able to obtain sufficient conditions for existence and nonexistence of eventually positive solutions.

6

The regulation of root growth in response to phosphorus deficiency mediated by phytohormones in a Tibetan wild barley accession

51%

Nadira U. A. , Ahmed I. M. , Wu F. , Zhang G.

Acta Physiologiae Plantarum

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2016

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tom 38

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nr 04

7

A novel alkaline protease from wild edible mushroom Termitomyces albuminosus

51%

Zheng S. , Wang H. , Zhang G.

Acta Biochimica Polonica

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2011

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tom 58

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nr 2

EN

A protease with a molecular mass of 30 kDa and the N-terminal sequence of GLQTNAPWGLARSS, was isolated from fresh fruiting bodies of the wild edible mushroom Termitomyces albuminosus. The purification protocol included ion exchange chromatography on DEAE-cellulose, Q-Sepharose, SP-Sepharose and FPLC-gel filtration on Superdex 75. The protein was unadsorbed on DEAE-cellulose and Q-Sepharose, but adsorbed on SP-Sepharose. The optimal pH and temperature of the purified enzyme were 10.6 and 60°C, respectively. The enzyme was stable in the presence of 2% (v/v) Tween 80 and 4 M urea. More than 80% of the enzyme activity was retained in 2% (v/v) Triton X 100, 54% in 10 mM EDTA and 31% in 2% (w/v) SDS. The enzyme was strongly inhibited by phenylmethylsulfonyl fluoride (PMSF), but not inhibited by dithiothreitol (DTT), pepstatin or lima bean trypsin inhibitor suggesting that it was a serine protease but not a trypsin-like one. The protease was inhibited by Hg2+, Cu2+, and Fe3+ ions. The Km and Vmax values of the purified enzyme for casein were 8.26 mg∙ml−1 and 0.668 mg∙ml−1∙min−1, respectively.

8

A new approach to robust ﬁnite-time H∞ control of continuous-time Markov jump systems

51%

Yan S. , Shen M. , Fei S. , Zhang G.

Control and Cybernetics

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2015

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tom Vol. 44, no. 2

211--231

EN

This paper studies the robust ﬁnite-time H∞ state feedback control problem of continuous-time Markov jump systems (MJSs) subject to norm bounded uncertainties. Transition probabilities are allowed to be known, uncertain with known bounds or unknown. Based on the continuous transition probability property and the developed slack variable technique, Lyapunov variables are separatek from unknown transition probabilities and system matrices. With these separations, a relaxed method for robust ﬁnite-time H∞ controller design is proposed in terms of linear matrix inequalities (LMIs). Numerical examples are given to illustrate the eﬀectiveness of and the beneﬁt from the proposed method.

9

A multivariate oscillation theorem

51%

Cheng S. S. , Liu S. T. , Zhang G.

Fasciculi Mathematici

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1999

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tom Nr 30

15-22

EN

An oscillation criterion is derived for a multivarjate partial difference equation.

10

Measurement and statistical modeling of BRDF of various samples

51%

Zhang H. , Wu Z. , Cao Y. , Zhang G.

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tom Vol. 40, nr 1

197--208

EN

Based on the Torrance-Sparrow model, a modified and simplified five-parameter model is obtained. Multi-angle bistatic reflectance data of surfaces of various materials are fitted using this model. Genetic algorithm is used to optimize the parameters for the model. The results of the five-parameter model are in good agreement with experimental data which do not take part in fitting, and are close to the results of two-dimensional bidirectional reflectance distribution function (BRDF) models. The five-parameter model shows a good applicability to various rough surfaces with different surface optical properties. The five-parameter model can be used to construct a three-dimensional BRDF distribution based on the spatial experimental data, which may provide more information on light scattering from rough surfaces.

11

Species diversity patterns differ by life stages in a pine-oak mixed forest

51%

Li Y. , Ye S. , Bai W. , Zhang G.

Dendrobiology

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2022

|

tom 88

12

Trace fossil Artichnus pholeoides igen. nov. isp. nov. in Eocene turbidites, Polish Carpathians : possible ascription to holothurians

51%

Zhang G. , Uchman A. , Chodyń R. , Bromley R.

Acta Geologica Polonica

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2008

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tom Vol. 58, no. 1

75-86

EN

A hitherto unknown trace fossil was found in some abundance in turbidites of the Polish Outer Carpathians. The occurrence is within the Hieroglyphic Beds of the Silesian Nappe, within the Szczyrzyc Synclinorium, of Middle Eocene age. The trace fossil is a wide, J-shaped structure having a narrow, upward tapering shaft as a connection to the seafloor. The distal end also tapers, to a blind termination. The burrow lumen is surrounded by an irregular spreite structure. The trace fossil is compared with the work of burrowing holothurians, which show some comparative features that suggest a tracemaker belonging to the Apodida.

13

The combined treatment of Mn and Al alleviates the toxicity of Al or Mn stress alone in barley

51%

Muhammad N. , Cai S. , Shah J. M. , Zhang G.

Acta Physiologiae Plantarum

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2016

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tom 38

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nr 12

14

Eco-physiological responses of scirpus planiculmis to different water-salt conditions in Momoge Wetland

51%

Zhang L. , Zhang G. , Li H. , Sun G.

Polish Journal of Environmental Studies

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2014

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tom 23

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nr 5

EN

As a common plant in Momoge Wetland, Scirpus planiculmis is the major food source for Siberian Crane (Grus leucogeranus), which is one of the most valuable waterfowl in Momoge Wetland. Through a simulation experiment, this study investigated the effects of different water table depths (-5, 5, 10, 20, and 30 cm) and salinities (300, 1,000, 3,000, 4,000, and 5,000 mg/L) on the eco-physiological characteristics (height, leaf area per plant, chlorophyll content, and chlorophyll fluorescence) of Scirpus planiculmis. The results indicate that for the seedlings of Scirpus planiculmis, the effects of water depth on plant height, leaf area per plant, and chlorophyll content were significant, while salinity affected height increment, chlorophyll content, and chlorophyll fluorescence parameters. For the plants of Scirpus planiculmis, the water depth had a significant effect on height increment and chlorophyll content, while salinity had a significant effect on height increment, chlorophyll content, and chlorophyll fluorescence parameters. These results indicate a suitable ecological response thresholds of water table and salinity on the growth of Scirpus planiculmis seedlings and plants, which were 5-10 cm and less than 3,000 mg/L for seedlings, 30 cm and 300-4,000 mg/L for plants.

15

The Hierarchical-Cluster Topology Control Strategy of InterPlaNetary Internet Backbone based on Libration Points

51%

Jiang Y. , Li G. , Zhang G. , Yang S.

Przegląd Elektrotechniczny

|

2012

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tom R. 88, nr 4a

271-276

EN

The concept of InterPlaNetary (IPN) Internet was proposed by National Aeronautics and Space Administration (NASA). The IPN Internet could provide Internet-like services crossing interplanetary distances in support of deep space exploration, which includes backbone network, access network, and planetary network. The IPN backbone topology control strategy based on Libration points was studied in this paper. Firstly, the location and stability of Libration point is simulated by celestial mechanics. Secondly, a novel Hierarchical-Cluster model of IPN backbone network is proposed to simplify topology design. Then Intra-Cluster Link and Inter-Cluster Link are analyzed in detail. Finally, the optimal handover moment is gotten by critical angle which to use relay theory, and the total number of handover times is calculated within a relative period between Uranus and Neptune cluster.

PL

Koncepcja interplanetarnego Internetu IPN została zaproponowana przez NASA. W artykule omówiono strategię kontroli topologii szkieletu bazującą, na punkcie Libration. Na wstępie przeanalizowano stabilność systemu a następnie model hierarchiczny klastrów. Wreszcie analizowano przełączenie połączeń między stacjami bazowymi – handover.

16

Platelets activated by the anti-β2GPI/β2GPI complex release microRNAs to inhibit migration and tube formation of human umbilical vein endothelial cells

51%

Zhang G. , Zhang W. , Zha C. , Liu Y.

Cellular and Molecular Biology Letters

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2018

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tom 23

EN

Background: Patients with anti-β2GPI antibodies display significantly higher platelet activation/aggregation and vascular endothelial cell damage. The mechanism underlying the correlation between platelet activation, vascular endothelial cell dysfunctions and anti-β2GPI antibodies remains unknown. Methods: In this study, we derived miR-96 and -26a from platelets activated by the antiβ2GPI/β2GPI complex and explored their role in modulating human umbilical vein endothelial cell (HUVEC) migration and tube formation. Results: Anti-β2GPI/β2GPI complex induces the release of platelet-derived microparticles (p-MPs). The amounts of miR-96 and -26a in these p-MPs were also higher than for the control group. Co-incubation of HUVECs with p-MPs resulted in the transfer of miR96 and -26a into HUVECs, where they inhibited migration and tube formation. The targeting role of these miRNAs was further validated by directly downregulating targeted selectin-P (SELP) and platelet-derived growth factor receptor alpha (PDGFRA) via luciferase activity assay. Conclusion: Our study suggests that miR-96 and -26a in p-MPs can inhibit HUVEC behavior by targeting SELP and PDGFRA.

17

Phase Transition and Plasticity Enhancement of Ti-Cu-Based Bulk Metallic Glasses

51%

Wang L. , Wang X. , Zhang G. , Sun X.

Archives of Metallurgy and Materials

|

2018

|

tom Vol. 63, iss. 1

387--391

EN

In this paper, we report the complex crystallization kinetics of phase transition happening in Ti-Cu-based bulk metallic glasses (BMGs), which play significant roles in the glass formation with respect to their low reduced glass transition temperatures, Trg. The first exothermic event just occurs when annealing the BMG samples in the supercooled liquid region, leading to the Avrami exponent deviating from conventional modes affected by the residual amorphous phase. For Ti43Cu43Ni7Zr7 BMG, the plasticity can be improved by pre-annealing at a sub-Tg temperature of 623K (≈50K below Tg) for 0.5 hour, however, deteriorated by 1 hour annealing, which could be related to the change in stability of this BMG against crystallization with different pre-annealing times.

18

Multiple Frequency Ultrasounds Assisted Oil Sands Separation Technology

51%

Liao K. , Ge J. , Zhang G. , Fu L.

Archives of Acoustics

|

2017

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tom Vol. 42, No. 4

767--773

EN

Ultrasound has a wide range of applications in oil sands separation industry due to its green and nopolluting characteristics. The combined ultrasounds technology has been widely used in many industries by virtue of the synergistic effect of cavitation effect; meanwhile, dual-frequency ultrasounds have been reported being used in lotion oil sands technology. Based on this idea, this study focuses on the application of multiple frequency ultrasounds in oil sands separation, and a comparative study has been conducted between the combined ultrasounds systems with the difference in the number of the ultrasound. The results show that the oil production rate of the samples treated by the lotion of sodium dodecyl benzene sulfonate (SDBS) and assisted by multiple frequency ultrasounds (96%) is significantly higher than that of the single frequency ultrasound (76%); the bigger the number of the ultrasound participating in the combination is, the higher the oil production rate of the oil sands is; the lower the frequency of the ultrasounds employed in the combined system is, the higher the oil production rate is. The optimum treating conditions for tri-frequency ultrasounds assisted technology are as follow: the treating time is 10-15 min, the treating temperature is 20-30°C, the concentration of surfactant in the lotion is 1.5 g/l, and the mass ratio of the lotion to oil sands is 1.8. In short, the use of multiple frequency ultrasounds can improve the oil production rate of oil sands, reduce the energy consumption during the separation process, and reduce the environmental contamination; therefore, multiple frequency ultrasounds assisted oil sands separation technology is a promising technology for oil sands resources exploitation with high efficiency.

19

Robust Cepstrum Radio Frequency Fingerprint Transformed from BPSK Signal

51%

Yuan H. , Bao Z. , Xu C. , Zhang G.

Przegląd Elektrotechniczny

|

2013

|

tom R. 89, nr 1b

193--195

EN

Identifying wireless devices based on Radio Frequency fingerprint (RFF) is a promising physical layer security methodology. One practical issue is the robustness of RFF affected by wireless multi-path channels, etc. Proposed is a kind of RFF with robustness for identifying digital BPSK transmitters. The cepstrum of the received BPSK signal is obtained and then low-pass filtered, the result signal is mainly determined by device impulse response, and thus is robust. The proposed fingerprint can be used in the fusion identification of BPSK wireless transmitters.

PL

W artykule opisano sposób radiowej identyfikacji urządzeń bezprzewodowych, o bezpiecznej identyfikacji cyfrowych nadajników BPSK. Uzyskane cepstrum odebranego sygnału BPSK, poddawane jest filtracji dolno-przepustowej, co w efekcie daje sygnał wyznaczony przez odpowiedź impulsową urządzenia. Opracowany algorytm można wykorzystać w rozpoznaniu łączenia się nadajników BPSK.

20

Influence of waterlogging on some anti-oxidative enzymatic activities of two barley genotypes differing in anoxia tolerance

51%

Zhang G. , Tanakamaru K. , Abe J. , Morita S.

Acta Physiologiae Plantarum

|

2007

|

tom 29

|

nr 2

EN

The experiment was conducted to investigate the formation of oxidative stress and the development of anti-oxidative enzymes in two barley genotypes differing in anoxia tolerance. Waterlogging led to significant reduction in root and shoot weight, green leaf area and tillers per plant, but tolerant Xiumai 3 was much less reduced than sensitive Gerdner. Malondialdehyde (MDA) content, an indicator of membrane lipid peroxidation, significantly increased in Gerdner when the plants were subjected to waterlogging, but remained little changed in Xiumai 3. Superoxide dismutase (SOD) activity was increased with waterlogging treatment and the sensitive cultivar had higher activity than the tolerant one during the experimental duration. At early stage of waterlogging treatment, both peroxidase (POD) and catalase (CAT) activities significantly increased in Xuimai 3, while obviously decreased in Gerdner. Moreover, both cultivars showed substantial increase in both POD and CAT with the progress of waterlogging exposure. Glutathione reductase (GR) activity was increased in both tolerant- and sensitive cultivars under waterlogging. It may be assumed from the current results that SOD activity appears to be not a constraining factor limiting the scavenging of ROS, and it is the change of POD and CAT activity under waterlogging that determine the status of oxidative stress. The difference between genotypes in waterlogging tolerance could be distinguished from the changed patterns of these enzymatic activities.