Wyniki wyszukiwania - Biblioteka Nauki

1

Short-Term Wind Power Forecasting with Combined Prediction Based on Chaotic Analysis

100%

Dong L. , Gao S. , Liao X. , Gao Y.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 5b

35-39

EN

With the integration of wind energy into electricity grids, it is becoming increasingly important to obtain accurate wind power forecasts. In this paper, models for short-term wind power prediction in large wind farms are discussed. The analysis of modeling with low dimensions nonlinear dynamics indicates that wind power time series have chaotic characteristics and wind power can be predicted in the short-term. The wind power prediction models are built with phase space reconstruction method and the combination model with different embedding dimensions is tested.

PL

Opisano metodę krótkoterminowego prognozowania mocy elektrowni wiatrowych bazującą na chaotycznym charakterze wiatru w krótkich odstępach czasu.

2

A prediction method for load distribution in threaded connections

100%

Zhang D. , Gao S. , Niu S. , Liu H.

Journal of Theoretical and Applied Mechanics

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2018

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tom Vol. 56 nr 1

157--168

EN

A new method has been developed for predicting the load distribution along the thread portion of a bolt and nut connection. The calculated results were validated by comparison with three-dimensional finite element analysis and Yamamoto’s method. It was shown that the load distribution predicted by the model in this paper was in good agreement with the results from finite element model, and the load ratio on the first thread by the prediction model and finite element model was slightly larger than the results from Yamamoto’s method. In addition, the results of calculation and finite element analysis indicated that the decreasing of the lead angle could improve the load distribution, the increasing of the length of thread engaged could significantly improve the load bearing capacity of the first thread, and the adopting of a material with low stiffness for the nut with respect to the bolt could improve the load distribution slightly.

3

Fast Scalar Multiplications on the Curve v2= up − au − b over the Finite Field of Characteristic p

100%

You L. , Yang Y. , Gao S. , Sang Y.

Fundamenta Informaticae

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2014

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tom Vol. 129, nr 4

395--412

EN

Hyperelliptic curves have been widely researched for cryptographic applications, and some special hyperelliptic curves are often considered for practical applications. For efficient implementation of hyperelliptic curve cryptosystems, it is crucial to have efficient scalar multiplication in the Jacobian groups. For the hyperelliptic curve Cq: v2= up − au − b over the field Fq with q a power of an odd prime p, Duursma and Sakurai (2000) presented a scalar multiplication algorithm for q = p, a = 1 and b ∈ Fp. In this paper, by introducing the concept of simple divisors, we prove that a general divisor can be decomposed into the sum of some simple divisors. Based on this fact, we present a formula for p-scalar multiplications for any reduced divisor, then we give two efficient algorithms to speed up scalar multiplications for any parameters a and b over any extension of Fp. Compared with the signed binary method, the computations of our algorithms cost 55% to 76% less.

4

The role of glycogen synthase kinase 3-beta in immunity and cell cycle: implications in esophageal cancer

100%

Gao S. , Brown J. , Wang H. , Feng X.

Archivum Immunologiae et Therapiae Experimentalis

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2014

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tom 62

|

nr 2

5

Pathogenicity of FtsK mutant of avian pathogenic Escherichia coli

100%

Xu X. , Chen X. , Gao S. , Zhao L.

Journal of Veterinary Research

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2016

|

tom 60

|

nr 1

6

Pb removal using mixed substrates in a constructed laboratory-scale unvegetated vertical subsurface-flow wetland

100%

Ren J. , Gao S. , Tao L. , Li H.

Polish Journal of Environmental Studies

|

2016

|

tom 25

|

nr 1

EN

In this study, five mixed substrates – SSFGF, FSSGF, FSSFF, FSSFG, and FSFGF – consisting of fly ash, sludge, soil, fine cinder, gravels, and fine sand, were made in order to test the removal effect of lead. Multiple comparisons and analysis of variance were used to analyze physicochemical properties and the removal efficiency of lead. The test results showed that for five substrates, the effluent concentrations were not significantly different among 10 mg/L and 40 mg/L initial concentrations. For the other three initial concentrations (20 mg/L, 80 mg/L and 160 mg/L) from five substrates, it was significantly different. Moreover, when decomposition time was 0.25 h~48 h, the removal efficiency of Pb from the solution was better for substrate SSFGF-based wetland than those of the other substrate-based wetlands at low and medium initial concentrations (10 mg/L, 20 mg/L, 40 mg/L, and 80 mg/L), and then it was slightly better for substrate FSSFF-based wetland. At relatively high initial concentrations (160 mg/L), the removal efficiency was better for substrate FSSFF-based wetland than those of the other substrate-based wetlands, and then it was slightly better for substrate SSGFF-based wetland. Our study further suggested that SSFGF and FSSFF were the two relatively ideal substrate materials suitable for removal of Pb from a constructed wetland system.

7

Impact of alternate drought and flooding stress on water use, and nitrogen and phosphorus losses in a paddy field

88%

Wang M. , Shao G. , Gao S. , Wang J. , Zhang Y.

Polish Journal of Environmental Studies

|

2018

|

tom 27

|

nr 1

EN

Alternate drought and flooding stress has become more prevalent during paddy growth stages as a result of climate change, especially in southern China. This study aims to assess the effect of alternate drought and flooding stress on water use, and nitrogen (N) and phosphorus (P) losses in paddy fields. Two controlled irrigation and drainage (CID) managements (namely drought at the beginning of growth stages followed by flooding (CID-1), and flooding at the beginning of growth stages followed by drought (CID-2) and one alternated wetting and drying (AWD) management were designed in specially designed experimental tanks with three replications in 2015 and 2016. Results showed that CID increased effective irrigation quantities and rainwater storage ability with a significant decrease in water use efficiency compared with AWD. For surface water, CID-1 significantly improved possible losses of nitrogen and phosphorus during the fertilizer application period over CID-2. For subsurface water, CID can significantly reduce the leaching losses of nitrate N and P compared with AWD. Meanwhile, CID-1 significantly increased the leaching losses of nitrate N at the former two growth stages compared to CID-2, yet no significant difference was found for ammonia N and P. Therefore, the application of controlled irrigation and drainage – especially for CID-1 – was an efficient method for obtaining high water quality and reducing eutrophication.

8

Associated growth of C3 and C4 desert plants helps the C3 species at the cost of the C4 species

88%

Su P. , Yan Q. , Xie T. , Zhou Z. , Gao S.

Acta Physiologiae Plantarum

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2012

|

tom 34

|

nr 6

EN

C₃ desert plant Reaumuria soongorica (RS-C₃) and C₄ desert plant Salsola passerina (SP-C₄) may exist either in individual or in associated communities. Carbon isotope composition, leaf water potential, gas exchange and chlorophyll fluorescence characteristics of the individual and associated communities were compared with reveal, whether the associated growth represent an advantage under harsh habitat. The results showed that the δ¹³Cvalues of leaves ofRS-C₃ and SP-C₄ across different habitats fluctuated, respectively, from-24 to-27 ‰ and from-14 to-16 ‰. Leafwater potential of RS-C₃ was lower than SP-C₄ all day long, growing either individually or associated with the C₃ plant. When associated with the C₄ plant, the net photosynthetic rate of the RS-C₃ increased, and the photosynthetic rate of the partner SP-C₄ decreased. The transpiration rates of the associatedRS-C₃ and SP-C₄ were both lower than in their individual colonies. In associated communities, in RS-C₃, the maximal photochemical efficiency, the effective photochemical efficiency, the relative electron transport rate, the photochemical quenching of PS II increased, and the non-photochemical quenching of PS II decreased; all these parameters changed oppositely in the SP-C₄ plant.This shows that, in the associated community, the C₄ plants might facilitate adaptation of the RS-C₃, while SP-C₄ plant can adapt to the harsh environment through their own specialties. The association favored the expression of natural photosynthetic characteristics and survival of RS-C₃, while retarded the growth of SP-C₄. Associated growth decreases the transpiration rate of the whole community; it is conducive to improve its water use efficiency.

9

Analysis Of Factors Affecting Gravity-Induced Deflection For Large And Thin Wafers In Flatness Measurement Using Three-Point-Support Method

88%

Liu H. , Dong Z. , Kang R. , Zhou P. , Gao S.

Metrology and Measurement Systems

|

2015

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tom Vol. 22, nr 4

531--546

EN

Accurate flatness measurement of silicon wafers is affected greatly by the gravity-induced deflection (GID) of the wafers, especially for large and thin wafers. The three-point-support method is a preferred method for the measurement, in which the GID uniquely determined by the positions of the supports could be calculated and subtracted. The accurate calculation of GID is affected by the initial stress of the wafer and the positioning errors of the supports. In this paper, a finite element model (FEM) including the effect of initial stress was developed to calculate GID. The influence of the initial stress of the wafer on GID calculation was investigated and verified by experiment. A systematic study of the effects of positioning errors of the support ball and the wafer on GID calculation was conducted. The results showed that the effect of the initial stress could not be neglected for ground wafers. The wafer positioning error and the circumferential error of the support were the most influential factors while the effect of the vertical positioning error was negligible in GID calculation.

10

Research of Fluorinated Acrylate Copolymer on Flax Fabric

88%

Sui Z. , Yang K. , Chen J. , Zhao X. , Gao S.

Fibres & Textiles in Eastern Europe

|

2017

|

tom Vol. 25, no. 6 (126)

83--88

EN

A fluorine-containing acrylate copolymer emulsion was prepared in this study, which was applied to finishing linen fabric. Dodecafluloroheptry methacrylate (G04) was used as a modified monomer, butylacrylate (BA) and methylacrylate (MMA) as soft and hard monomers.respectively, and acrylic acid as a functional monomer. Structure and properties of the products were characterised and analyzed by FTIR, TEM, PSD and CA measurements, respectively. The water and air permeability as well as the breaking force of the fabric treated were also investigated. The results showed that the fluorine-containing acrylate copolymer emulsion obtained had a core-shell structure, and the microsphere was of nanoscale size. Because of the latex film on the fabric surface, it became smooth and flat. And the increase in G04 was beneficial to the mechanical properties, waterproofness and antifouling ability of the linen fabric. When the content of G04 were increased from 0% to 20%, the water in the linen sample and hexadecane contact angles to the copolymer film increased from 113.02° to 136.08° and from 65.1° to 87.6°,respectively. Furthermore the breaking force of the linen samples was enhanced from 648 N to 721N. However, the increasing content of G04 had negative effects on the flexural rigidity as well as water and air permeability of the fabric, which were essential requirements for the fabric’s application. However, the wash resistance was excellent and the wear-resistance of the finished linen fabric was better than the unfinished linen fabric.

PL

W pracy przygotowano emulsję kopolimeru akrylanowego zawierającą fluor, którą następnie zastosowano do wykańczania tkanin lnianych. Jako modyfikowany monomer zastosowano metakrylan dodekafluoroheptan (G04), a jako miękkie i twarde monomery użyto akrylan butylu (BA) i akrylan metylu (MMA), a kwas akrylowy jako monomer funkcjonalny. Strukturę i właściwości produktów scharakteryzowano i przeanalizowano za pomocą pomiarów FTIR, TEM, PSD i CA. Przebadano również przepuszczalność wody i powietrza oraz siłę zrywania tkaniny poddanej obróbce. Wyniki wykazały, że otrzymana fluorowa emulsja kopolimeru akrylanowego miała strukturę rdzeń-otoczka, a mikrosfera miała rozmiar w nanometrach. Ze lateksowej powłoce tkanina stała się gładka i matowa. Stwierdzono, że wzrost G04 wpływa korzystnie na właściwości mechaniczne, wodoodporność i zdolność przeciwporostową tkaniny lnianej. Zwiększenie zawartości G04 spowodowało wzrost kąta zwilżania, a siła zrywania próbek zwiększyła się z 648 do 721 N. Jednak wzrastająca zawartość G04 miała negatywny wpływ na sztywność zginania, a także przepuszczalność wody i powietrza tkaniny, które były zasadniczymi cechami wymaganymi dla aplikacji tkaniny. Jednakże odporność na pranie i zużycie była lepsza w przypadku próbek powleczonych.

11

Design of brake force distribution model for front-and-rear-motor-drive electric vehicle based on radial basis function

88%

Sun B. , Zhang T. , Gao S. , Ge W. , Li B.

Archives of Transport

|

2018

|

tom Vol. 48, iss. 4

87--98

EN

To achieve high-efficiency and stable brake of a front-and-rear-motor-drive electric vehicle (FRMDEV) with parallel cooperative braking system, a multi-objective optimal model for brake force distribution is created based on radial basis function (RBF). First of all, the key factors, which are the coefficient of brake force distribution between the front and rear shafts, the coefficient of brake force distribution at wheels, the coefficient of regenerative brake force distribution between front and rear axles, that influence the brake stability and energy recovery of the FRMDEV are analyzed, the fitness functions of brake stability and energy recovery are established. Secondly, the maximum allowed regenerative brake torque influenced by the state of charge of battery is confirmed, the correction model of the optimal distribution coefficient of regenerative brake force is created according to motor temperatures. Thirdly, based on HALTON sequence method, a two-factor database, vehicle velocity and brake strength, that characterizes vehicle operation is designed. Then an off-line response database of the optimal brake force distribution is established with the use of particle swarm optimization (PSO). Furthermore, based on hybrid RBF, the function model of the factor database and the response database is established, and the accuracy of the model is analyzed. Specially, the correlation coefficient is 0.995 and the predictive error variance is within the range between 0.000155 and 0.00018. The both indicate that the multi-objective distribution model has high accuracy. Finally, a hardware-in-loop test platform is designed to verify the multi-objective optimal brake force distribution model. Test results show that the real-time performance of the model can meet the demand of engineering application. Meanwhile, it can achieve both the brake stability and energy recovery. In comparison with the original brake force distribution model based on the rule algorithm, the optimized one proposed in this paper is able to improve the energy, recovered into battery, by 14.75%.

12

Oxidative stress induced by cobalt in Jatropha curcas seedlings: response of growth and chemical changes

75%

Hu Y. , Song Y. , Yu D. , Qian W. , He M. , Yi L. , Gao S.

Journal of Elementology

|

2023

|

tom 28

|

nr 4

13

Reconsideration of the phylogenetic position of Frontonia-related Peniculia [Ciliophora, Protozoa] inferred from the small subunit ribosomal RNA gene sequences

75%

Gao S. , Chen Z. , Shao C. , Long H. , Al-Rasheid K. A. S. , Song W.

Acta Protozoologica

|

2008

|

tom 47

|

nr 1

47-54

14

Model to assess the habitat suitability for endangered bird species: Brown Eared-pheasant Crossoptilon mantchuricum Swinhoe in Xiaowutaishan Reserve, China

75%

Li D. , Gao S. , Wu Y. , Sun L. , Guo S. , Li J.

Polish Journal of Ecology

|

2008

|

tom 56

|

nr 4

723-729

EN

Brown Eared-pheasant (Crossoptilon mantchuricum Swinhoe, 1863) is an endangered species endemic to China. Habitat management for Brown Eared-pheasant has to compensate the loss of natural forests and to improve their habitat quality. In this study, we applied a Habitat Suitability Index (HSI) model to analyze the habitat suitability and quality for the breeding populations of this species in Xiaowutaishan National Nature Reserve, North China. The Reserve (area 21833 ha) is located at 800–2882 m a.s.l. and high mountain and deep valley habitats as well as different types of mountain forest and alpine meadows occur there. We used six variables (vegetation type, canopy cover, altitude, exposure, slope gradient and position of slope) both in field observation and in the analysed model. According to the utilization rates of different habitat types by Brown Eared-pheasants, these variables were categorized into five classes (unsuitable, less suitable, moderately suitable, suitable, and highly suitable). Our results show that highly suitable, suitable, less suitable and unsuitable habitat accounted for 13.5%, 53%, 32%, and 1.5% of the entire reserve area, respectively. Our HSI model is well validated by the observed data. We expect this study can be useful as an example of successful model applying to the habitat management or population manipulation of the endangered species.

15

Sex-related differences in physiological and ultrastructural responses of Populus cathayana to Ni toxicity

75%

Chen L. , Zhang L. , Tu L. , Xu Z. , Zhang J. , Gao S.

Acta Physiologiae Plantarum

|

2014

|

tom 36

|

nr 07

EN

We used Populus cathayana, a native species with an extensive distribution in northern, central, and southwestern China, as a model species to detect the sex-specific differences in photosynthetic capacity, ultrastructure, nitrogen (N) metabolism, and nickel (Ni) accumulation and distribution in response to Ni stress. Exposure to 100 μM Ni²⁺ in a hydroponic system for 1 month significantly decreased the pigment content and the photosynthetic rate, caused visible impairment in cellular organelle structure, and induced obvious disturbance and imbalance in the N content of female plants, while male plants suffered a lower negative influence on all the above measured parameters. However, males accumulated a higher Ni concentration in both leaves and roots than females, while the transportation ratio of Ni from roots to shoots in males was slightly lower than that in females. Our results, therefore, suggest that males have a better tolerance capacity and a greater ability to remediate Ni-polluted soil than females. This greater tolerance capacity in males might be highly correlated with the better maintenance of N balance and more effective physiological detoxification responses (such as the response to proline) under Ni stress. The differences between the sexes in tolerance capacity to heavy metals should be verified after performing a field investigation using adult trees as materials in the future study.

16

Model to assess the habitat suitability for endangered bird species : Brown-Eared pheasant Crossoptilon mantchuricum Swinhoe in Xiaowutaishan Reserve, China

75%

Li D. , Gao S. , Wu Y. , Sun L. , Guo S. , Li J.

Polish Journal of Ecology

|

2008

|

tom Vol. 56, nr 4

723-729

EN

Brown Eared-pheasant (Crossoptilon mantchuricum Swinhoe, 1863) is an endangered species endemic to China. Habitat management for Brown Eared-pheasant has to compensate the loss of natural forests and to improve their habitat quality. In this study, we applied a Habitat Suitability Index (HSI) model to analyze the habitat suitability and quality for the breeding populations of this species in Xiaowutaishan National Nature Reserve, North China. The Reserve (area 21833 ha) is located at 800.2882 m a.s.l. and high mountain and deep valley habitats as well as different types of mountain forest and alpine meadows occur there. We used six variables (vegetation type, canopy cover, altitude, exposure, slope gradient and position of slope) both in field observation and in the analysed model. According to the utilization rates of different habitat types by Brown Eared-pheasants, these variables were categorized into five classes (unsuitable, less suitable, moderately suitable, suitable, and highly suitable). Our results show that highly suitable, suitable, less suitable and unsuitable habitat accounted for 13.5%, 53%, 32%, and 1.5% of the entire reserve area, respectively. Our HSI model is well validated by the observed data. We expect this study can be useful as an example of successful model applying to the habitat management or population manipulation of the endangered species.

17

Research on the neuro-protective compounds in Terminalia chebula retz extracts in-vivo by UPLC–QTOF-MS

75%

Zhang Y. , Liu X. , Gao S. , Qian K. , Liu Q. , Yin X.

Acta Chromatographica

|

2018

|

tom Vol. 30, no. 3

169--174

EN

We have developed a strategy to analyze the components absorbed in the plasma and brain tissue of rats after intragastric administration of Terminalia chebula Retz extracts by ultra-performance liquid chromatography–quadrupole time-of-flight mass spectrometry (UPLC–QTOF-MS). Nine components (gallic acid, methyl gallate, ferulic acid, ethyl gallate, brevifolin carboxylic acid, ellagic acid, galloflavin, arjugenin, and arjunic acid) and four metabolites were identified in plasma, and five components (ethyl gallate, brevifolin carboxylic acid, ellagic acid, arjugenin, and arjunic acid) were identified in the rat brain based on their fragmentation behaviors. The components present in the plasma were associated with the antioxidant activity of T. chebula Retz, and the components absorbed in the brain were associated with its neuro-protective effects. This approach allowed us to rapidly determine the active components of T. chebula Retz and develop a method for its quality control. This analysis method showed good resolution and high sensitivity, and is a potentially powerful tool for the determination of effective components of natural products.

18

Nutritional components and antioxidant activities of Firmiana platanifolia seeds in response to different germination times

75%

Zhi X. M. , Qian W. Z. , Song Y. , Mu C. J. , Yu D. S. , Lin X. , Gao S.

Journal of Elementology

|

2024

|

tom 29

|

nr 1

19

Expression profile and function characterization of the MYB type transcription factor genes in wheat (Triticum aestivum L.) under phosphorus deprivation

75%

Fang W. , Ding W. , Zhao X. , Zhang F. , Gao S. , Li X. , Xiao K.

Acta Physiologiae Plantarum

|

2016

|

tom 38

|

nr 01

20

Effects of nitrogen on growth parameters and photosynthetic characteristics of P. chinense Schneid. Seedlings in three soil types

75%

Gao S. , Gu T. , He J. , Meng Ying W. , Ren H. , Wang Y. , Yao Y.

Journal of Elementology

|

2023

|

tom 28

|

nr 2