Wyniki wyszukiwania - Biblioteka Nauki

1

Creep response of a generalized Maxwell model

100%

Chen P.

|

1994

|

tom 08

|

nr 4

2

Fractional evolution equation nonlocal problems with noncompact semigroups

63%

Zhang X. , Chen P.

Opuscula Mathematica

|

2016

|

tom Vol. 36, no. 1

123--137

EN

This paper is concerned with the existence results of mild solutions to the nonlocal problem of fractional semilinear integro-differential evolution equations. New existence theorems are obtained by means of the fixed point theorem for condensing maps. The results extend and improve some related results in this direction.

3

A fuzzy shape database to support conceptual design

51%

Zhang J. , Pham B. , Chen P.

Control and Cybernetics

|

2004

|

tom Vol. 33, no 1

141-172

EN

At the conceptual stage of design, designers only have vague ideas of initial shapes which they gradually refine. These imprecise shapes may be specified by a set of fuzzy shape descriptors which represent the intent of a designer. It is also desirable to be able to save them in a database for future reference or for use as initial shapes for new designs. Most research on fuzzy databases has been focused on theoretical aspects while a fuzzy database is rarely seen in practice, especially in the design area. This paper aims to construct a fuzzy shape database to support shape design by integrating fuzzy data processing and fuzzy querying functions into a conventional database. A possibility-based framework is used for a fuzzy relational database model.

4

Research on key process technology for profile electrolytic finishing of large marine propeller impeller

51%

Ding B.-R. , Chen Y. , Zhou J. , Chen P.

Polish Maritime Research

|

2018

|

tom 25

|

nr Special Issue S2

EN

An electrolysis process method for free-form blade surface finishing is proposed for a free-form surface impeller, and a stepwise method is used to process the inter-blade channel of the overall impeller. The forming cathode is then used to finish the blade to meet the blade processing requirements. In the design, the forming cathode structure was improved by using motion simulation software, and the flow field simulation software was used to simulate and analyze the cathode flow channel. The cathode shape and the electrolyte flow rate between the electrodes meet the processing requirements. In the process of processing experiments, the motion path of the cathode was analyzed and optimized. The effect of the feed direction on the uneven distribution of the blade machining gap was reduced through optimization, and high-frequency pulse power processing was used to reduce the machining gap and improve the machining accuracy of the blade. The experimental results show that the process scheme is feasible and the precision of the processed impeller free-form surface is significantly improved. The material is a monolithic turbine disk of high-temperature alloys, and its large twisted blade processing has always been a problem in the manufacturing industry

5

Effect of processing whole cottonseed on nutrient digestibility and ruminal fermentation in dairy cows

51%

Chen P. , Ji P. , Cao Z. J. , Li S. L.

Journal of Animal and Feed Sciences. Supplement

|

2007

|

tom 16

|

nr 2

6

Research on key process technology for profile electrolytic finishing of large marine propeller impeller

51%

Ding B. , Chen Y. , Zhou J. , Chen P.

Polish Maritime Research

|

2018

|

tom S 2

158--163

EN

An electrolysis process method for free-form blade surface finishing is proposed for a free-form surface impeller, and a stepwise method is used to process the inter-blade channel of the overall impeller. The forming cathode is then used to finish the blade to meet the blade processing requirements. In the design, the forming cathode structure was improved by using motion simulation software, and the flow field simulation software was used to simulate and analyze the cathode flow channel. The cathode shape and the electrolyte flow rate between the electrodes meet the processing requirements. In the process of processing experiments, the motion path of the cathode was analyzed and optimized. The effect of the feed direction on the uneven distribution of the blade machining gap was reduced through optimization, and highfrequency pulse power processing was used to reduce the machining gap and improve the machining accuracy of the blade. The experimental results show that the process scheme is feasible and the precision of the processed impeller free-form surface is significantly improved. The material is a monolithic turbine disk of high-temperature alloys, and its large twisted blade processing has always been a problem in the manufacturing industry.

7

Effect of processing whole cottonseed on yield and composition of milk in dairy cows

51%

Chen P. , Ji P. , Cao Z. J. , Li S. L.

Journal of Animal and Feed Sciences. Supplement

|

2007

|

tom 16

|

nr 2

8

Enhanced corrosion resistance for silsesquioxane coatings by diglycidyl ether of biphenol A

51%

Chen P. , Hu L. , Zhang X. , Sun D.

Materials Science Poland

|

2007

|

tom Vol. 25, No. 3

843--849

EN

Based on silsesquioxanes (SSO), derived from hydrolytic condensation of (Gamma-glycidoxylpropyl)- trimethoxysilane (GPMS) and various amounts of tetraethoxysilane (TEOS), hybrid films (f-GST) were prepared using the sol-gel process. Because the epoxy-ring opening or the silica chains were not fully cross-linked, the f-GST was more susceptible to corrosion due to higher hydroxyl content and its hydrophilicity. Diglycidyl ether of biphenol A (DGEBA) was added into the reaction system to enhance the density of the film and to prevent epoxy ring opening during condensation. The film prepared with DGEBA, GPMS-SSO (GS) and 20 wt. % TEOS (f-GSTD) exhibited the best corrosion resistance compared with f-GST and bare aluminum alloy (AA). The f-GST and f-GSTD were studied as anticorrosion coatings on AA by electrochemical measurement. The results clearly demonstrate that samples with higher TEOS fractions have better anticorrosive performance and DGEBA obviously enhances the anticorrosion effect of f-GST.

9

Zaero: a unified AIC module for aerodynamic/aeroelastic design and analysis

51%

Chen P. , Sarhaddi D. , Liu D.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

|

1998

|

tom nr 8

103-122

EN

The ZAERO module is a unified unsteady/steady aerodynamic influence coefficient (UAIC) methodology for complex aircraft configurations which is applicable to all Mach numbers covering the unified subsonic, transonic, supersonic and hypersonic ranges. Various application examples in using ZAERO for unsteady pressure and flutter analysis and for wing structural design/optimization are presented. The stand-alone ZAERO has a versatile program structure in that it can readily be interfaced with existing FEM programs such as NASTRAN or ASTROS for aerodynamic/aeroelastic design and analysis. Seamlessty integrated with ASTROS, ZAERO is now the newly adopted aerodynamic module to replace the DLM/CPM and USSAERO for dynamic/static aeroelasticity applications within the ASTROSIMDO environment. Meanwhile, the development of an aeroservoelastic (ASE) module based on ZAERO is near completion. Almost all results obtained for the above examples show favorable comparisons with available data, thus demonstrating the capability and solution accuracy of ZAERO. While the releases of ZAERO and ASTROS* (^ZAERO+ASTROS) are forthcoming, the validation of the ZAERO/ASE module is aggressively being pursued at present.

10

P-type iterative learning control of nonlinear systems with uncertainties

51%

Chen P. , Qin H. , Ye X.

Systems Science

|

2004

|

tom Vol. 30, no 3

77-84

EN

This paper deals with the problem of robustness of P-type iterative learning control for uncertain nonlinear system. Besides the vector field, the control matrix and output matrix of the control system considered in this paper all have uncertainties. Iterative learning laws for initial states and for inputs are presented. A new technique has been developed to estimate the tracking errors of iterative control systems, which have an initial state error. Based on the estimation, upper bounds of the norms of the uncertainties of the control matrix and the output matrix are obtained, which guarantee that the iterative learning laws for initial states and for inputs are convergent. The results in this paper show that the P-type iterative learning control has robustness with respect to the uncertainties of the control matrix and the output matrix.

11

Risk analysis of maritime accidents in an estuary: a case study of Shenzhen Waters

51%

Chen P. , Mou J. , Li Y.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

|

2015

|

tom nr 42 (114)

54--62

EN

Due to the unique geographic location, complex navigation environment and intense vessel traffic, a considerable number of maritime accidents occurred in estuarine waters during recent years which caused serious loss of life, property and environmental contamination. Based on the historical data of maritime accidents from 2003 to 2012, which is collected from Shenzhen Maritime Safety Administration, this paper conducted a risk analysis of maritime accidents by applying Bayesian network and fault tree analysis. First a Bayesian network model was introduced to describe the consequence of accidents based on the accident investigation report. Then fault tree analysis was applied to estimate the probability on the basis of accident statistics and ship traffic flow. Finally the risk of maritime accidents in Shenzhen Waters was depicted through the consequence multiplied by the probability of an accident.

12

Multi-ship encounter situation analysis with the integration of elliptical ship domains and velocity obstacles

51%

Cheng Z. , Chen P. , Mou J. , Chen L.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

|

2023

|

tom Vol. 17 No. 4

895--902

EN

With economic globalization, ships tend to be larger and faster, and the volume of maritime traffic is increasing. Ships sailing in waters with dense traffic flow are easy to fall into complicated multi-ship encounter situations and have a high risk of collision. Thus, it is crucial to conduct risk analysis in such situations. In this paper, a modified collision analysis method for detecting dangerous multi-ship encounters in ports and waterways is proposed. The velocity obstacle algorithm is utilized to detect encounters. The model of the elliptic ship domain was integrated into the algorithm as the criteria. The Boolean operation was also used in the multi-ship encounter. A case study is conducted to illustrate the efficacy of the improved model, and a comparison between the existing method and the formal model is also performed. The results indicate that with the integration of the ship domain, the proposed method can effectively detect the encounters of multiple ships which are dangerous to collide.

13

Vertical distribution of nearshore flow velocity

45%

Li C. , Fu X. , Li R. , Dai L. , Chen P.

Polish Maritime Research

|

2016

|

tom 23

|

nr Special Issue S1

EN

In this paper, a new exponential formed vertical distribution of nearshore flow velocity is constructed, which is simpler in form and more suitable for engineering application. The physical meaning of the new formula is more specific than that of Soulsby. Compared with those logarithmic formed ones, the new one does not need the maximum velocity and only needs the mean velocity in vertical, which gives it better engineering practicability. Apply the new formula to Jiangsu coastal area and compare the results with that of Soulsby whose results show the new formula agrees better with the measured flow velocity, which reasonably reflects the basic principles of vertical distribution of flow velocity

14

Effect of acetylated soyabean peptides on rumen fermentation and nitrogen metabolism in sheep

45%

Cao Z. J. , Li S. L. , Wang Y. J. , Ma M. , Chen P.

Journal of Animal and Feed Sciences. Supplement

|

2007

|

tom 16

|

nr 2

15

Vertical distribution of nearshore flow velocity

45%

Li C. , Fu X. , Li R. , Dai L. , Chen P.

Polish Maritime Research

|

2016

|

tom S 1

104--108

EN

In this paper, a new exponential formed vertical distribution of nearshore flow velocity is constructed, which is simpler in form and more suitable for engineering application. The physical meaning of the new formula is more specific than that of Soulsby. Compared with those logarithmic formed ones, the new one does not need the maximum velocity and only needs the mean velocity in vertical, which gives it better engineering practicability. Apply the new formula to Jiangsu coastal area and compare the results with that of Soulsby whose results show the new formula agrees better with the measured flow velocity, which reasonably reflects the basic principles of vertical distribution of flow velocity.

16

Effects of maize and lucerne particle size on ruminal passage rate, chewing activity of cows in midlactation

45%

Cao Z. J. , Ma M. , Wang L. L. , Chen P. , Li S. L.

Journal of Animal and Feed Sciences. Supplement

|

2007

|

tom 16

|

nr 2

17

Orally administered endoxifen inhibits tumor growth in melanoma-bearing mice

45%

Chen P. , Sheikh S. , Ahmad A. , Ahmad U. , Ahmad I.

Cellular and Molecular Biology Letters

|

2018

|

tom 23

EN

Endoxifen, an active metabolite of tamoxifen, has been shown to be an effective anti-estrogenic agent in estrogen receptor-positive breast cancer patients. In melanoma, estrogen receptor expression is shown to be associated with disease progression. However, the therapeutic benefit of endoxifen in melanoma has not yet been evaluated. Here, we present the first demonstration of the anti-melanogenic activity of endoxifen in vitro and in vivo. The in vitro cytotoxic effect of endoxifen was tested using a cell viability assay. The in vivo anti-melanogenic activity was evaluated in B16F10 cell-bearing C57BL/6 mice, a mouse melanoma model. The general toxicity was tested in Swiss albino mice. Endoxifen exhibited greater activity against melanoma cell lines. Treatment of B16F10 mouse and SK-MEL-5 human melanoma cell lines with 10 μM of endoxifen for 48 h respectively resulted in 93.6 and 92.5% cell death. Orally administered endoxifen, at dose levels of 4 and 8 mg/kg body weight/day for 20 consecutive days, respectively reduced metastatic melanoma nodules in the lungs by 26.7 and 82.7%. Endoxifen was found to be a safe and effective anti-melanogenic agent in animal studies.

18

Abnormal Breast Detection in Mammogram Images by Feed-forward Neural Network Trained by Jaya Algorithm

38%

Wang S. , Rao R. V. , Chen P. , Zhang Y. , Liu A. , Wei L.

Fundamenta Informaticae

|

2017

|

tom Vol. 151, nr 1/4

191--211

EN

(Aim) Abnormal breast can be diagnosed using the digital mammography. Traditional manual interpretation method cannot yield high accuracy. (Method) In this study, we proposed a novel computer-aided diagnosis system for detecting abnormal breasts in mammogram images. First, we segmented the region-of-interest. Next, the weighted-type fractional Fourier transform (WFRFT) was employed to obtain the unified time-frequency spectrum. Third, principal component analysis (PCA) was introduced and used to reduce the spectrum to only 18 principal components. Fourth, feed-forward neural network (FNN) was utilized to generate the classifier. Finally, a novel algorithm-specific parameter free approach, Jaya, was employed to train the classifier. (Results) Our proposed WFRFT + PCA + Jaya-FNN achieved sensitivity of 92.26% ± 3.44%, specificity of 92.28% ± 3.58%, and accuracy of 92.27% ± 3.49%. (Conclusions) The proposed CAD system is effective in detecting abnormal breasts and performs better than 5 state-of-the-art systems. Besides, Jaya is more effective in training FNN than BP, MBP, GA, SA, and PSO.

19

Physiological adaptive mechanisms of plants grown in saline soil and implications for sustainable saline agriculture in coastal zone

38%

Yan K. , Shao H. , Shao C. , Zhao S. , Brestic M. , Chen P. , Chen X.

Acta Physiologiae Plantarum

|

2013

|

tom 35

|

nr 10

EN

There is large area of saline abandoned and lowyielding land distributed in coastal zone in the world. Soil salinity which inhibits plant growth and decreases crop yield is a serious and chronic problem for agricultural production. Improving plant salt tolerance is a feasible way to solve this problem. Plant physiological and biochemical responses under salinity stress become a hot issue at present, because it can provide insights into how plants may be modified to become more tolerant. It is generally known that the negative effects of soil salinity on plants are ascribed to ion toxicity, oxidative stress and osmotic stress, and great progress has been made in the study on molecular and physiological mechanisms of plant salinity tolerance in recent years. However, the present knowledge is not easily applied in the agronomy research under field environment. In this review, we simplified the physiological adaptive mechanisms in plants grown in saline soil and put forward a practical procedure for discerning physiological status and responses. In our opinion, this procedure consists of two steps. First, negative effects of salt stress are evaluated by the changes in biomass, crop yield and photosynthesis. Second, the underlying reasons are analyzed from osmotic regulation, antioxidant response and ion homeostasis. Photosynthesis is a good indicator of the harmful effects of saline soil on plants because of its close relation with crop yield and high sensitivity to environmental stress. Particularly, chlorophyll a fluorescence transient has been accepted as a reliable, sensitive and convenient tool in photosynthesis research in recent years, and it can facilitate and enrich photosynthetic research under field environment.

20

Response mechanism in Populus x euramericana cv. ‘74/76’ revealed by RNA-seq under salt stress

38%

Chen P. , Zuo L. , Yu X. , Dong Y. , Zhang S. , Yang M.

Acta Physiologiae Plantarum

|

2018

|

tom 40

|

nr 05