Wyniki wyszukiwania - Biblioteka Nauki

1

Takagi-Sugeno fuzzy control scheme for electrohydraulic active suspensions

100%

Du H. , Zhang N.

Control and Cybernetics

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2010

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tom Vol. 39, no 4

1095-1115

EN

The paper presents a new control strategy for active vehicle suspensions using electrohydraulic actuators based on Takagi-Sugeno (T-S) fuzzy modelling technique. As the electrohydraulic actuator dynamics is highly nonlinear, the T-S fuzzy modelling technique using the idea of "sector nonlinearity" is applied to exactly represent the nonlinear dynamics of electrohydraulic actuator in a denned region at first. Then, by means of parallel distributed compensation (PDC) scheme and Lyapunov method, a fuzzy HOO controller is designed for the T-S fuzzy model to optimise the suspension ride comfort performance, considering actuator input voltage saturation problem. The sufficient conditions for the existence of such a controller are derived in terms of linear matrix inequalities (LMIs). The advantage of this new control strategy for electro-hydraulic active suspensions is that it directly aims at optimising suspension performance with guaranteeing the closed-loop system stability. Thus, two-loop control strategy, where the inner loop is used to make the electrohydraulic actuator tracking a desired force (pressure, or displacement, etc.), is not necessary. In addition, the controller is simple in structure compared to the adaptive control algorithms. A numerical example is used to validate the effectiveness of the proposed approach. It is confirmed by the simulations that the designed controller can achieve better performance than the active suspension with optimal skyhook damper.

2

MiR-30b is involved in methylglyoxal-induced epithelial-mesenchymal transition of peritoneal mesothelial cells in rats

80%

Liu H. , Zhang N. , Tian D.

Cellular and Molecular Biology Letters

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2014

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tom 19

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nr 2

EN

Epithelial-mesenchymal transition (EMT) of peritoneal mesothelial cells (PMC) is a major contributor to the pathogenesis of peritoneal fibrosis. EMT is at least in part caused by repeated exposure to glucose degradation products (GDPs), such as methylglyoxal (MGO). MiRNA contributes greatly to the EMT of PMCs. In this study, we tried to profile whether differences exist between the peritoneal membrane (PM) miRNA expression seen in control rats and that seen in rats injected intraperitoneally with MGO. We assessed whether miR-30b has a possible role in MGO-induced EMT of PMCs in rats. Comparative miRNA expression array and real-time PCR analyses were conducted for the control group at the start of the experiment and for the MGO group after 1 and 2 weeks. During the second week, the MGO rats were treated with: a chemically modified antisense RNA oligonucleotide (ASO) complementary to the mature miR-30b (ASO group); an miR-30b mismatch control sequence (MIS group); or a citrate buffer (EMT group). Bioinformatic analyses indicated that the 3′ untranslated region (3′-UTR) of bone morphogenetic protein 7 (BMP7) mRNA did contain a putative binding site for miR-30b. We also tried to investigate whether miR-30b targeted BMP7 in vitro by transfection. Of the upregulated miRNAs, miR-30b expression demonstrated the greatest increase. The administration of miR-30b ASO for two weeks significantly reduced α-SMA excretion and upregulated E-cadherin and BMP-7 expression. Our in vitro study showed that miR-30b directly targeted and inhibited BMP7 by binding to its 3’-UTR. Our results revealed that miR-30b is involved in MGO-induced EMT of PMCs in rats.

3

Hydrothermal synthesis and characterization of tube-structured ZnO needles

80%

Li Y. , Feng H. , Zhang N. , Liu C.

Materials Science Poland

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2009

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tom Vol. 27, No. 2

551--557

EN

Tube-structured ZnO needles were successfully synthesized hydrothermally, using H2O2 as the solvent, Zn (NO3)2o6H2O and NaOH as the starting materials and C19H42BrN as the additive. The samples were characterized by scanning electron microscopy, X-ray diffraction and room temperature photoluminescence measurements. The as-synthesized ZnO needle possesses a tube structure coiled by multilayer along the [0001] direction and a wurtzite structure. The intensity of the (0002) diffraction peak is obviously lower than the (10?0) and (10?1) peaks. Photoluminescence results reveal that the UV emission is restrained as hydrothermal temperature increases, and that the concentration of H2O2 has no influence on the photoluminesence when the concentration of H2O2 is higher than 10%.

4

Preparation of Self-cleaning Polyester Fabrics by Chemical Vapor Deposition of Methyltrichlorosilane/Dimethyldichlorosilane

80%

Zheng Z. , Wang H. , Zhang N. , Zhao X.

Fibres & Textiles in Eastern Europe

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2017

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tom Vol. 25, no. 1 (121)

121--124

EN

Self-cleaning polyester fabrics were prepared by a simple gas phase deposition procedure in which a layer of polydimethylsiloxane nanofilaments was grown onto textile fibers. Superhydrophobic and self-cleaning properties, tensile breaking strength, mechanical stability and permeability of polyester fabrics were investigated. The results showed that the fabrics deposited had superhydrophobicity, and the contact angle and sliding angle of the fabric surface were 159° and 1.7°, respectively. The self-cleaning test showed that dust particles adhere to rolling water and shed from the surface of polyester fabric, leaving an extremely clean surface. In addition, the polyester fabric deposited still has excellent breaking strength and permeability. This approach is simple, inexpensive and has little effect on the mechanical properties of the fabric.

PL

Samooczyszczające tkaniny poliestrowe przygotowano metodą chemicznego osadzania z fazy gazowej, w którym warstwa nanofilamentów polidimetylosiloksanu narastała na włóknach tekstylnych powodując superhydrofobowość i nadając właściwości samoczyszczące. Po obróbce badano wytrzymałość na zerwanie, trwałość mechaniczną i przepuszczalność powietrza. Wyniki wykazały, że zmodyfikowane tkaniny miały właściwości superhydrofobowe, a kąty zwilżania i poślizgu po powierzchni tkaniny wynosiły odpowiednio 159° i 1,7°. Testy zdolności samooczyszczających wykazały, że cząsteczki pyłu przylegają do cząstek wody i wraz z nią spływają po powierzchni tkaniny poliestrowej. Zastosowana metoda jest prosta, niedroga i nie wpływa negatywnie na obrabianą tkaninę.

5

Set-theoretic Approaches to Granular Computing

80%

Yao Y. , Miao D. , Zhang N. , Xu F.

Fundamenta Informaticae

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2012

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tom Vol. 115, nr 2/3

247-264

EN

A framework is proposed for studying a particular class of set-theoretic approaches to granular computing. A granule is a subset of a universal set, a granular structure is a family of subsets of the universal set, and relationship between granules is given by the standard set-inclusion relation. By imposing different conditions on the family of subsets, we can define several types of granular structures. A number of studies, including rough set analysis, formal concept analysis and knowledge spaces, adopt specific models of granular structures. The proposed framework therefore provides a common ground for unifying these studies. The notion of approximations is examined based on granular structures.

6

Combined bending-tension/compression deformation of micro-bars accounting for strain-driven long-range interactions

80%

Zhang N. , Yan J. W. , Li C. , Zhou J. X.

Archives of Mechanics

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2019

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tom Vol. 71, nr 1

3--21

EN

The paper aims to investigate combined bending-tension/compression deformation of a micro-bar. The strain-driven nonlocal differential model which involves information about long-range interactions between atoms is used to develop the mechanical model and theoretical formulations. Subsequently, effects of internal long-range scale parameter, length of micro-bar, external loads and bending rigidity on combined deformation are shown and discussed. In particular, the upper bound of internal longrange scale parameter and the buckling load are achieved during bending-compression analyses. It is demonstrated that the existence of internal scale parameter or axial tensile load decreases combined deformation. The deflection at the midpoint reduces with increasing bending rigidity, while it rises with increasing length of the microbar. Additionally, an effect of the acting position of transverse load on combined deformation is discussed and deflection at the symmetry point of transverse acting position is achieved. When the long-range interaction is taken into consideration, the equivalent stiffness of the micro-bar subjected to combined bending-tension is stiffer than that predicted by classical mechanics, and it validates the existing nonlocal hardening model. The combined bending-compression of the micro-bar reveals that the deflection may increase or decrease with an increase in the long-range scale or structural length, which verifies both the nonlocal softening and hardening models.

7

Effects of dietary supplementation with Bacillus subtilis and yeast culture on growth performance, nutrient digestibility, serum indices and faeces microbiota of weaned piglets

80%

Cui K. , Iv X. , Diao Q. , Zhang N.

Journal of Animal and Feed Sciences

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2019

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tom 28

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nr 4

8

Optimum design of fiber angle and hole orientation of an orthotropic plate

80%

Zhang X. , Lu A. , Wang S. , Zhang N.

Journal of Theoretical and Applied Mechanics

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2018

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tom Vol. 56 nr 1

297--311

EN

With the goal of decreasing the stress concentration along the hole boundary in an orthotropic plate under inequi-biaxial loadings, an optimum design of the fiber angle and hole orientation is presented. The maximum absolute tangential stress along the hole boundary is taken as the objective function, and the fiber orientation angle and the hole orientation angle are considered as design variables. The conformal transformation method of a complex function and the Differential Evolution (DE) algorithm are used. Two non-circular shapes, ellipse and hexagon are taken as examples to analyze the problem. Based on the results, we can conclude that the major axis of elliptical holes should be designed in the direction of the maximum external loading for a perforated structure in an orthotropic plate. However, the principal direction that has the larger Young’s modulus should be inclined to the direction of the minimum loading, especially for a significantly orthotropic plate.

9

Preparation of a novel fluorescent nanocomposite: CeO2 / ANS by a simple method

80%

Liu X. , Lian X. , Li Y. , Zhang N.

Materials Science Poland

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2012

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tom Vol. 30, No. 1

70--73

EN

For the first time, a novel fluorescent material, composed of CeO2/ANS nanocomposites was successfully synthesized by a simple ultrasonic method, using CeO2 nanoparticles and 8-anilino-1-naphthalenesulfonic acid (ANS) as the raw materials. The samples were characterized by scanning electron microscope (SEM), photoluminescence spectroscopy and Fourier transformation infrared spectroscopy (FTIR). The results showed that the PL intensity of the CeO2/ANS nanocomposites was higher than that of both CeO2 nanoparticles and ANS powders, and the peak wavelength was also different from the peak wavelength typical of each of the used materials, which suggests that the chemical reaction occurs between CeO2 nanoparticles and ANS molecules. In addition, the effect of the ANS concentrations on the photoluminescence of the nanocomposites was also investigated.

10

CO2 emissions from the power industry in the China’s Beijing-Tianjin-Hebei region: decomposition and policy analysis

80%

Zhang C. , Zhang M. , Zhang N.

Polish Journal of Environmental Studies

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2017

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tom 26

|

nr 2

EN

Based on the energy consumption data of power industry in the Beijing-Tianjin-Hebei region from 1995 to 2014, our paper first estimated CO₂ emissions using the IPCC carbon accounting methods. Then, starting from the perspective of the power industry chain – including power generation, transmission, and final consumption – we established the hierarchical LMDI decomposition model; decomposed driving factors of CO₂ emissions into effects of fuel mix; the coal consumption rate; power generation structure; the ratio of power generation to consumption, transmission, and distribution losses; production sectors’ electricity intensity; industrial structure; household electricity intensity; economic scale; and population size. Results show that: 1. During 1995-2014, CO₂ emissions of power industry in the Beijing-Tianjin-Hebei region developed in fluctuation and showed a rising trend in general, with annual average growth rate of 5.93%. 2. The factors that drive the growth of CO₂ emissions from the power industry in the Beijing-Tianjin-Hebei region are, in order, economic scale, population size, transmission and distribution losses, and industrial structure, with a contribution rate of 150.70%, 20.80%, 8.86%, and 8.83%. The factors that drive CO₂ emissions reduction are production sectors’ electricity intensity, the coal consumption rate, the ratio of electricity generation and consumption, household electricity intensity, power generation structure, and fuel mix, with a contribution rate of -45.97%, -22.38%, -19.41%, -0.62%, -0.49%, and -0.32%, respectively

11

Investigation of the transport of aflatoxin M1 by the transporter ABCG2 in bovine mammary epithelial cells

71%

Zhang Y. , Zhang N. , Chen D. , Huang G. , Cao H.

Medycyna Weterynaryjna

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2020

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tom 76

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nr 11

12

Comparison of laparoscopic-assisted and open colopexy in dogs

71%

Zhang S. , Zhang J. , Zhang N. , Shi J. , Wang H.

Bulletin of the Veterinary Institute in Puławy

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2012

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tom 56

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nr 3

EN

The objective of this study was to describe laparoscopic-assisted colopexy (LAC) technique, and compare the extent of the surgical trauma after LAC and open colopexy (OC) by examing postoperative serum values of C-reactive protein (CRP) in dogs. Twelve healthy mixed-breed dogs with body weight ranging from 15 to 25 kg were used. Two portal sites were used for LAC procedures. OC was performed by laparotomy on linea alba. Colopexy was accomplished in all dogs without major intraoperative and postoperative complications. A permanent adhesion between the colon and abdominal wall was observed. There were statistically significant differences in serum CRP levels between LAC and OC immediately after the procedure and 1 d post operation. LAC had a similar pexy effect to OC, but had fewer surgical trauma than OC in dogs.

13

Control of potato tuber dormancy and sprouting by expression of sense and antisense genes of pyrophosphatase in potato

71%

Si H. , Zhang C. , Zhang N. , Wen Y. , Wang D.

Acta Physiologiae Plantarum

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2016

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tom 38

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nr 03

14

Qualities and antioxidant activities of lotus leaf affected by different drying methods

61%

Guo C. , Zhang N. , Liu C. , Xue Y. , Chu J. , Yao X.

Acta Physiologiae Plantarum

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2020

|

tom 42

|

nr 02

15

Synthesis of porous ZnO nanostructures using bamboo fibers as templates

61%

Lian X. , Li Y. , An D. , Zou Y. , Wang Q. , Zhang N.

Materials Science Poland

|

2014

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tom Vol. 32, No. 3

514--520

EN

In this study, we fabricated ZnO nanostructures using bamboo fibers as templates. The starting material used was zinc acetate, and the nanostructures were synthesized by soaking and calcining the bamboo fibers. The fabricated nanostructures were characterized using X-ray powder diffraction (XRD) analysis, scanning electron microscopy (SEM), and ultraviolet-visible spectrophotometry. The results showed that the size of the ZnO nanoparticles was approximately 20–100 nm. When the ZnO nanoparticles were used as the catalyst in the photodegradation of methyl orange, the dye degraded by 95.98 % in 80 min. The response and recovery times of a gas sensor based on the ZnO nanoparticles were 25 and 24 s, respectively, during the detection of C2H5OH in a concentration of 10 ppm at 270 °C.

16

Evaluation of an Intelligent Computer Method for the Automatic Mosaic of Sequential Slub Yarn Images

61%

Li Z. , Zhang N. , Wu Y. , Wang J. , Pan R. , Gao W.

Fibres & Textiles in Eastern Europe

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2018

|

tom Vol. 26, no. 2 (128)

38--48

EN

This paper is the second part of a series reporting the recent development of a computerised method for automatic mosaic sequential yarn images. In our earlier work, an effective method for stitching sequence slub yarn images automatically was developed based on image processing and the normalised cross correlation (NCC) method. 100 image pairs of two kinds of slub yarn were measured in certain specific conditions, such as the frame rate, size of stitching template, etc., and the measurement results were evaluated with the manual method. In this paper, the effects of various influencing factors are numerically examined, including the stitching template size, threshold value, frame rate, and computing time of the mosaic algorithm. The feasibility and accuracy of the fully computerized method were evaluated further under the various influencing parameters. One hundred percent cotton ring spun single slub yarns of 27.8, 15.6, and 9.7tex were prepared and used for the evaluation. The measurement results obtained by the method proposed are analysed and compared with those measured manually by Adobe Photoshop. The experimental results show that the method proposed can accurately find the stitch position and has a high consistency with the manual method when the matching template is 100 × N pixels, the threshold value T1∈[20, 40] and T2∈[51, 80], and the frame rate is greater than 40fps.

PL

Artykuł jest drugą częścią serii opisującej opracowanie sekwencyjnej metody przetwarzania obrazu przędz ozdobnych. We wcześniejszej pracy opracowano skuteczną metodę oceny przędz w oparciu o przetwarzanie obrazu i znormalizowaną metodę korelacji krzyżowej (NCC). Zbadano w określonych warunkach (liczba klatek na sekundę, rozmiar szablonu szycia itp.) 100 par obrazów dwóch rodzajów przędz, a następnie oceniono wyniki pomiarów. Przeprowadzono eksperymenty mające na celu zbadanie wykonalności i dokładności proponowanej metody. W pracy przeanalizowano numerycznie wpływ różnych czynników tj. rozmiaru szablonu, wartości progowej, liczby klatek na sekundę i czasu obliczeń algorytmu mozaikowego. Wykonalność i dokładność w pełni skomputeryzowanej metody zostały poddane dalszej ocenie. Metodę manualnej segmentacji obrazu i metodę automatycznej identyfikacji powierzchni przędzy ozdobnej przy wykorzystaniu odpowiednio przygotowanego algorytmu opartego o techniki numeryczne. W metodzie ręcznej segmentacji wprowadzono zmienne oparte o prędkość odczytywania danych z obrazu, które następnie poddawano analizie. W metodzie automatycznej zaproponowano wprowadzenie innych bardzie przydatnych zmiennych do identyfikacji charakterystycznych cech strumienia włókien. Plan eksperymentu obejmował trzy rodzaje przędz bawełnianych wytworzonych na przędzarce obrączkowej (27,8, 15,6 i 9,7tex). Wyniki pomiarów zaproponowanej metody analizowano i porównywano z pomiarami wykonywanymi ręcznie. Wyniki eksperymentalne pokazały, że proponowana metoda może być z powodzeniem stosowana i ma wysoką zgodność z metodą ręczną, przy szablonie 100 x N pikseli, wartości progowej T1∈ [20, 40] i T2∈ [51, 80] oraz liczbie klatek na większej niż 40 klatek na sekundę.

17

Beta-hydroxybutyrate, glucose, calcium, phosphorus, and vitamin C concentrations in blood of dairy cows with subclinical ketosis during the early lactation

61%

Zhang Z. , Liu G. , Li X. , Wang Z. , Kong T. , Zhang N. , Guo C.

Bulletin of the Veterinary Institute in Puławy

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2009

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tom 53

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nr 1

71-74

EN

The objective of this study was to examine the association between β-hydroxybutyrate (BHBA) and glucose, calcium (Ca), phosphorus (P), and vitamin C concentrations in dairy healthy and with subclinical ketosis cows during an early lactation period. The blood from 99 healthy cows and 26 sub-clinically ketotic cows within the first two months of lactation was sampled. Serum concentration of BHBA was measured by enzymatic-rate method, glucose by oxidase method, and P by colorimetric method. These tests were performed in a biochemical auto-analyser. Serum Ca concentration was measured by atomic absorption spectrometer followed by acid digestion. Vitamin C was measured by HPLC. The results showed that in ketotic cows serum BHBA was significantly increased (P<0.01) and glucose and Ca concentrations were significantly decreased (P<0.01) as compared to healthy cows, while vitamin C and P concentrations were similar in the both groups of cows (P>0.05). The serum BHBA concentration was negatively correlated with the serum glucose and Ca concentrations (P<0.01). Vitamin C and P status of cows with subclinical ketosis was not affected by BHBA. Serum Ca concentration can be used as a reference index for the diagnosis of subclinical ketosis.

18

Construction of high-efficiency transformation vector with multiple insect-resistant genes and expression in tobacco

61%

Yuan S. , Dong Y. , Zhang N. , Ren Y. , Yang M. , Gao B.

Acta Physiologiae Plantarum

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2017

|

tom 39

|

nr 01

19

Desloratadine ameliorates olfactory disorder and suppresses AMPA receptor GluA1 expression in allergic rhinitis rat

51%

Li S. , Zhang X. , Li Z. , Jiang X. , Zhang N. , Zhang J. , Huang Y. , Zhao H. , Jiang Y. , Li N.

Archivum Immunologiae et Therapiae Experimentalis

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2020

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tom 68

|

nr 1

20

Genome-wide identification and expression profiling of WUSCHEL-related homeobox (WOX) genes during adventitious shoot regeneration of watermelon (Citrullus lanatus)

51%

Zhang N. , Huang X. , Bao Y. , Wang B. , Liu L. , Dai L. , Chen J. , An X. , Sun Y. , Peng D.

Acta Physiologiae Plantarum

|

2015

|

tom 37

|

nr 11

EN

The WUSCHEL-related homeobox (WOX) gene family is a hotspot for diverse functions in development biology. Recently available whole-genome sequences allowed a more comprehensive analysis of WOX genes in watermelon (Citrullus lanatus). The results of this study provide a genomic framework for further research of watermelon WOX genes and contribute to understanding of the evolutionary mode of WOX genes in Cucurbitaceae crops. The qRT-PCR analysis demonstrated active expression of 11 WOX genes in watermelon tissues, which brings new evidence for WOX genes acting as conserved factors during watermelon development. Moreover, the distinct expression profiles of WOX genes during shoot initiation might lead todifferent shoot regeneration abilities. This work gives an overview of the differentially expressed WOX genes during shoot regeneration inwatermelon. The interrelations of WOX genes, phytohormones and other transcription factors during the process will be the focus of future studies.