Wyniki wyszukiwania - Biblioteka Nauki

1

Weighted composition operators from weighted hardy spaces to weighted-type spaces

100%

Zhu X.

Demonstratio Mathematica

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2013

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tom Vol. 46, nr 2

335--344

EN

The boundedness and compactness of the weighted composition operator from weighted Hardy spaces to weighted-type spaces are studied in this paper.

2

Essential norm of an integral-type operator from ω-Bloch spaces to μ-Zygmund spaces on the unit ball

63%

Du J. , Zhu X.

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tom Vol. 38, no. 6

829--839

EN

In this paper, we give an estimate for the essential norm of an integral-type operator from ω-Bloch spaces to μ-Zygmund spaces on the unit ball.

3

Compact generalized weighted composition operators on the Bergman space

63%

Hu O. , Zhu X.

Opuscula Mathematica

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2017

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tom Vol. 37, no. 2

303--312

EN

We characterize the compactness of the generalized weighted composition operators acting on the Bergman space.

4

Verification of a numerical simulation code for underwater chain moor

63%

Zhu X. , Yoo W.

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2016

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tom Vol. LXIII, nr 2

231--244

EN

Numerical simulation is an economical and effective method in the field of marine engineering. The dynamics of mooring cables has been analysed by a numerical simulation code that was created on a basis of a new element frame. This paper aims at verifying the accuracy of the numerical simulation code through comparisons with both the real experiments and a commercial simulation code. The real experiments are carried out with a catenary chain mooring in a water tank. The experimental results match the simulation results by the numerical simulation code well. Additionally, a virtual simulation of a large size chain mooring in ocean is carried out by both the numerical simulation code and a commercial simulation code. The simulation results by the numerical simulation code match those by the commercial simulation code well. Thus, the accuracy of the numerical simulation code for underwater chain mooring is verified by both the real experiments and commercial simulation code.

PL

Symulacja numeryczna jest ekonomiczną i efektywną metodą w dziedzinie inżynierii okrętowej. Dynamikę lin cumowniczych analizowano numerycznie przy pomocy oprogramowania symulacyjnego stworzonego na podstawie nowego opisu elementu. Celem pracy była weryfikacja dokładności symulacji numerycznej przez porównanie z eksperymentami w warunkach rzeczywistych i z komercyjnym oprogramowaniem symulacyjnym. Eksperymenty prowadzono w cysternie z wodą, z użyciem cum łańcuchowych. Wyniki eksperymentów zgadzają się dobrze z wynikami symulacji numerycznej. Dodatkowo, wykonano wirtualną symulację cumowania oceanicznego na długiej cumie łańcuchowej stosując własny program symulacyjny i oprogramowanie komercyjne. Uzyskano dobrą zgodność wyników obydwu symulacji. Tak więc, dokładność opracowanego programu do symulacji podwodnego cumowania łańcuchowego została zweryfikowana zarówno na drodze doświadczalnej, jak i przez porównanie z oprogramowaniem komercyjnym.

5

A simple and practical color image encryption with the help of QR code

63%

Deng X. , Zhu X.

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2015

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tom Vol. 45, nr 4

513--521

EN

A simple and practical color image encryption is proposed with the help of quick response (QR) code. The original color image to be encoded is firstly transformed into the corresponding QR code, and then a joint transform correlator encrypting architecture is used to encode the corresponding QR code into a positive ciphertext. In the decryption, the corresponding QR code can be restored with the correct decryption key, and hence the original color image can be retrieved without any quality loss by scanning the restored QR code with a smartphone. Compared with the reported color image encryption techniques, the proposed technique does not need to convert color image (RGB) into indexed image formats or segregate into three color components prior to encryption and hence the corresponding reverse processes also are not required after decryption. Moreover, with the help of the QR code, the proposed method has strong tolerance to speckle noise and other noises resulting from optical system. In addition, the proposed method is practical because its ciphertext is a positive image and can be printed directly or manufactured as a card. The feasibility and effectiveness of the proposed method are demonstrated by numerical results.

6

Study on electromagnetic shielding efficacy of knitting clothing

51%

Zhu X. , Li X. , Sun B.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 3b

42-43

EN

This paper enlarges on some main influence factors of electromagnetic shielding efficacy from the shielding mechanism of electromagnetic radiation while developing and designing electromagnetic shielding knitting fabric. Such as radiation, radiant distance, choice of radiation shielding material and clothes structure etc. According to these factors, it pertinently put forward the emphasis of design and develop preventing electromagnetic radiation knitting clothing.

PL

W artykule zaprezentowano skuteczność ekranowania elektromagnetycznego materiałów tekstylnych o specjalnej strukturze. Przedstawiono odzież ochronną z takich materiałów.

7

Examining economic development and carbon emissions in China’s low-carbon pilot provinces

51%

Li C. , Li X. , Zhu X.

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nr 6

EN

Taking small-scale areas as research units, this paper empirically explores the dynamic relationship between economic development and carbon emissions from 1995 to 2013 in China’s low-carbon pilot provinces. This subject has been neglected in the literature. We first apply decoupling theory to analyse the decoupling of economic development and carbon emissions. We then apply a STIRPAT model and ridge regression to deconstruct the mechanism whereby economic development influences carbon emissions in China’s low-carbon provinces. Empirical results show a positive linear correlation between economic development and carbon emissions in the examined provinces. We find that population size and industrial structure most prominently affect carbon emissions; however, per capita wealth, technological progress, and policy factors do not show the expected significance. Our results allow policymakers to formulate lowcarbon policies on the basis of empirically verified situations in the examined regions. They suggest that restricting population growth and transforming industrial structures are the keys to reducing China’s carbon emissions.

8

A 0.18um CMOS 15MW current -mode FLF linear phase filter with gain boost

51%

Zhu X. , Sun Y. , Moritz J.

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tom T. 12

35-42

EN

The design and implementation of a CMOS continuous-time follow-the-leader-feedback (FLF) filter is described. The filter is implemented using a fully-differential linear, low voltage and low power consumption operational transconductance amplifier (OTA) based on a source degeneration topology. PSpice simulations using a standard TSMC 0.18um CMOS process with 2V power supply have shown that the cut-off frequency of the filter ranges from 55MHz to 160MHz and dynamic range is about 45dB. The group delay is less than 5% over the whole tun-ing range; the maximum power consumption is 15mW only.

PL

W artykule przedstawiono projekt i implementację w technologii CMOS filtru FLF (follow-the-leader-feedback) z czasem ciągłym. Filtr został zaimplementowany z wykorzystaniem różnicowych liniowych niskonapięciowych transkonduktorów (OTA) o małym poborze mocy. Symulacje PSpice wykorzystujące parametry standardowego procesu TSMC 0,18[mi]m CMOS z napięciem zasilania 2V wykazały że częstotliwość odcięcia filtru zawiera się w granicach od 55 MHz do 160 MHz, a dynamika wynosi około 45 dB. Opóźnienie grupowe jest mniejsze od 5% w całym zakresie strojenia, a maksymalny pobór mocy wynosi zaledwie 15mW.

9

Numerical study of stall inception in a transonic axial compressor rotor based on the throttle model

51%

Zhu X. , Liu B. , Hu J. , Shen X.

Journal of Theoretical and Applied Mechanics

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2015

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tom Vol. 53 nr 2

307--316

EN

The goal of the current paper is to investigate inner flow behavior on stall inception in a transonic compressor rotor. The stall inception process is numerically carried out by unsteady 3-D simulations based on the throttle model. The current study shows that stall starts from the tip of the blade, and stall cell extends to the axial, circumferential and radial directions. Through the comparison of flow transition characteristics at different flow rate conditions, the interface between the incoming flow and tip clearance flow shifts forward to the upstream as the mass flow decreases. Eventually, the shock detaches from the blade leading edge, and tip clearance flow spills into the adjacent blade passage, thus stall happens in the affected blade passages.

10

Salicylic acid induces physiological and biochemical changes in peony under waterlogging stress

51%

Zhu X. , Shi H. , Li X. , Jin S.

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nr 1

EN

In this study, the effects of salicylic acid to antioxidative activity and photosynthetic characteristics in waterlogging stress of two peony cultivars (‘Fengdanbai’ and ‘Mingxing’) were investigated. 4-year-old peony grown in different levels of waterlogging stress and then different concentration prepared SA (0.0, 0.1, 0.5 and 1.0 mmol L⁻¹) sprayed on fresh leaves of peony. The antioxidative enzymes activities include superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), chlorophyll content, relative conductivity and MDA content were measured in leaves about different waterlogging treatment, the photosynthetic characteristics were also measured using photosynthetic measurement system. The results showed that waterlogging stress decreased the chlorophyll content in all peony cultivars leaves, but with SA treatment can inhibit the decrease of chlorophyll content. Relative conductivity increased as the extension of waterlogging time in two cultivars. SA treatment could effectively inhibit the increase of relative conductivity, and 0.5 mmol L⁻¹ of SA was the most suitable concentration. SOD, POD, CAT activity increased first and then decreased in different waterlogging condition, SA significantly increased the activity of various enzymes. MDA content was increase as the expansion of waterlogging time in two cultivars. SA inhibits the increase of MDA content. Of all concentration of SA, 0.5 mmol L⁻¹ was the best concentration to inhibit the waterlogging stress. For the photosynthetic characteristics, the net assimilation rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) and intercellular CO₂ (Ci) were decreased under different waterlogging condition. SA treatment can increase Pn, Gs, Tr and Ci of peony.

11

Collaborative innovation of low-carbon technology from the triple helix perspective: exploring critical success factors based on DEMATEL-ISM

51%

Cui H. , Zhu X. , Wang H.

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nr 2

12

Alzheimer's disease and the cell cycle

51%

Raina A. K. , Zhu X. , Smith M. A.

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nr 1

13

A Semantic Model for Matchmaking of Web Services Based on Description Logics

45%

Shen G. , Huang Z. , Zhang Y. , Zhu X. , Yang J.

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tom Vol. 96, nr 1/2

211-226

EN

Matchmaking plays an important role in Web services interactions. The matchmaking based on keywords easily leads to low precision, Meanwhile, the current semantic service discovery methods perform service I/O based profile matching, there exists no matchmaker that performs an integrated service matching by additional reasoning on logically defined preconditions, effects, Qos and so on. In this paper, the semantic web services are described based on Description Logics, and the services description model is designed, which describes the various aspects (such as IOPEs, Qos and so on) of the web services. So the services matchmaking is transformed into the match of concepts. The service match algorithm is proposed and the description logics reasoner RacerPro is adopted for Web services discovery. We show how the semantic matching between providers and a requester is performed by a case study.

14

Deashing and desulphurization of fine oxidized coal by falcon concentrator and flotation

45%

Zhu X. , Tao Y. , Sun Q. , Man Z. , Xian Y.

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tom Vol. 52, iss. 2

634--646

EN

Flotation and enhanced gravity separation based on different separation principles were carried out to investigate the desulphurization and deashing efficiency of fine oxidized coal. Surface properties of fresh and oxidized coals were tested by XPS and results showed that the contents of hydrophobic functional groups decreased while the content of hydrophilic functional groups increased after oxidization. Floatability and density analysis results showed that the floatability of coal samples decreased sharply because of oxidation, however, density composition of coal sample only had slight changes. Separation results showed that yields of gravity concentrates outclassed that of flotation concentrates, meanwhile, ash contents and sulfur contents of gravity concentrates were far lower than that of flotation concentrates. Yields and ash contents increased with the collector dosage and achieved to be 17.83 and 26.94% respectively when the collector dosage was 1600 g•Mg-1. Yields and ash contents of gravity concentrates decreased with the centrifugal force and increased with the recoil water flow with similar sulfur content. Clean coal with yield of 53.86%, ash content of 9.81%, sulfur content of 1.47% and with a corresponding desulphurization efficiency of 44.53% was achieved at centrifugal force of 107 g and recoil water flow of 13.3 dm3•min-1. For fine oxidized coal, enhanced gravity separation has a significant advantage of the separation efficiency compared with flotation.

15

Differential proteomic analysis of dwarf characteristics in cucumber (Cucumis sativus Linn.) stems

38%

Xin M. , Qin Z. , Wang L. , Zhu Y. , Wang C. , Zhu X.

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nr 01

EN

Dwarfism was one of the most important agronomic traits in cucumber breeding. The current study was conducted to identify dwarf-related proteins using twodimensional electrophoresis. Twenty-two differentially expressed protein spots were detected between dwarf and vine genotypes while 20 of them were successfully identified by MALDI-TOF/TOF MS. Out of 20 identified proteins in dwarf genotype, 14 were up-regulated and six were down-regulated. The classification of differential proteins showed that the identified proteins were functionally involved in photosynthesis, energy metabolism, cytoskeletal functions, transduction and signal regulation, detoxification and redox regulation. Five differentially regulated proteins were analyzed using the technique quantitative real-time PCR (qRT-PCR). The results showed that four proteins, including histone deacetylase, the EIN2- like protein, chlorophyll A/B binding protein, and ubiquitin-conjugating enzyme Spm2 (E2) were up-regulated and one F-box family protein was down-regulated in the dwarf genotype. Further western blot analysis revealed that only E2 protein was detected in the dwarf genotype, indicating its important role in the cucumber dwarf trait.

16

The intrabody targeting of hTERT attenuates the immortality of cancer cells

38%

Zhu X. , Yang N. , Cai J. , Yang G. , Liang S. , Ren D.

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tom 15

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nr 1

32-45

EN

hTERT (human telomerase reverse transcriptase) plays a key role in the process of cell immortalization. Overexpression of hTERT has been implicated in 85% of malignant tumors and offers a specific target for cancer therapy. In this paper, we describe an effective approach using a single-chain variable fragment (scFv) intrabody derived from monoclonal hybridoma directed against hTERT to attenuate the immortalization of human uterine cervix and hepatoma cells. The scFv we constructed had a high affinity to hTERT, and specifically neutralized over 70% of telomere synthesis activity, thereby inhibiting the viability and proliferation of the cancer cells. Our results indicate that this anti-hTERT intrabody is a promising tool to target hTERT and intervene in the immortalization process of cancer cells.

17

Molecular characterization and expression patterns of ghrelin in the reindeer (Rangifer tarandus)

32%

Zhang M. , Xu X. , Zhu X. , Jin X. , Bao H. , Dugeer S. , Du C. , Cao G. , Yang Y.

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18

Phase features of several typical blood cells and their identification without unwrapping

32%

Wang Y. , Chen Y. , Lü C. , Shang X. , Xu Y. , Wu H. , Zhu X. , Jin W.

Optica Applicata

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2013

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tom Vol. 43, nr 3

505--514

EN

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.

19

Molecular characterization and expression patterns of ghrelin in the reindeer (Rangifer tarandus)

32%

Zhang M. , Zhu X. , Xu X. , Jin X. , Bao H. , Dugger S. , Du C. , Cao G. , Yang Y.

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nr 1

20

Thalidomide-based TNF-alpha inhibitors for neurodegenerative diseases

32%

Greig N. H. , Giordano T. , Zhu X. , Yu Q. , Perry T. A. , Holloway H. W. , Brossi A. , Rogers J. T. , Sambamurti K. , Lahiri D. K.

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nr 1