24 results on '"ZHAO, Jing"'
Search Results
2. DDCO model based false news detection research
- Author
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Zhao Jing, Wei Bin, and Sun Yandong
- Subjects
cooperative attention mechanism ,ddco ,false news detection ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
With the rapid development of the information age, while the popularity of social media brings great convenience, it also brings some negative effects, such as the spread of false news. At present, the identification of fake news is still based on the personal screening ability, therefore, the intelligent and information-based automatic detection algorithm has become one of the hot issues of current research. Based on the characteristics of DCAN and DEFEND models, this paper proposes an novel model DDCO, which uses multi-layer collaborative attention mechanism to extract the most relevant information from the three dimensions of sentence level, word level and sentence-comment level respectively. Finally, the model designed in this paper is tested on Weibo and Twitter data sets, and the results show that the DDCO has a higher accuracy than the existing models, which provides an important reference for false news detection.
- Published
- 2024
- Full Text
- View/download PDF
3. Exploring Teachers’ Perceptions towards TaskBased Language Teaching (TBLT) in Teaching English Reading at a Public University in China
- Author
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Zhao Jing
- Subjects
Social Sciences - Abstract
Task-Based Language Teaching (TBLT), as the top-down policy advocated in English education in China, has been acknowledged as an effective method to improve students’ reading skills. Teachers’ perceptions about TBLT could influence the design and implementation of TBLT in the class and, ultimately, students’ learning outcomes. Therefore, it is necessary to conduct research on teachers’ perceptions within the classroom context. This research aims to explore EFL teachers’ perceptions of TBLT in teaching English reading at a public university in China. A qualitative case study was conducted with 11 university EFL teachers through purposive sampling. The analysis of the focus group interview with 8 teachers and the individual interviews with 3 teachers was conducted in this study. Additionally, data triangulation was employed with document analysis. The findings indicated that college EFL teachers in the university had a comparatively clear understanding of TBLT in teaching English reading. However, some of the teachers misunderstood TBLT, which caused challenges for them when implementing TBLT in the class. The results propose pedagogical ideas for successful TBLT design and implementation in the tertiary setting in China.
- Published
- 2024
- Full Text
- View/download PDF
4. La question du féminisme en Chine: Une lecture de Simone de Beauvoir
- Author
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Zhao, Jing
- Published
- 2014
5. Étude des aspects cinétiques et thermodynamiques gouvernant la perméabilité de modèles d’essence à l’interface de deux matériaux polymères barrières : application à l’optimisation de réservoirs pour carburants
- Author
-
Zhao, Jing, Laboratoire de Chimie Physique Macromoléculaire (LCPM), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Lorraine, and Anne Jonquières
- Subjects
[SPI.OTHER]Engineering Sciences [physics]/Other ,SORPFIT ,Perméabilité ,Composites-Absorption et adsorption ,UNIQUAC ,Fuel tank ,Essence ,Carburants ,Polymères-Perméabilité ,Multi-component transfer ,Films multicouches ,Multi-layer films ,Permeability ,Barrier materials ,Matériaux barrières ,Réservoir de carburants ,Sorption ,Gasoline ,Transfert multicomposant ,Réservoirs (récipients) - Abstract
Accès restreint aux membres de l'Université de Lorraine jusqu'au 2015-12-14; Responding to a strong demand for security, weight reduction and volume optimization, the fuel tanks are currently usually made of polymer multi-layer barriers in order to limit vapour emissions into the atmosphere. The prediction of their permeability remains a world-wide critical challenge for the multi-layer optimization. Thanks to original semi-automated experimental set-ups, sorption and permeability measurements were carried out for three leading polymer materials (HDPE, EVOH and Binder) and model fuel mixtures of ethanol, iso-octane and toluene. The modelling of the sorption properties was successfully achieved by the UNIQUAC model and a new model called SORPFIT. The parameters of the diffusion laws according to the TSVF2 or the generalized Long models were also optimized for each polymer despite some difficulty with EVOH. An original methodology was then proposed for predicting the partial fluxes of polymer multi-layers from the characteristic parameters of the corresponding mono-layers. Depending on the nature and disposition of each layer, two scenarios were identified: the kinetics limitation and the thermodynamics limitation of mass transfer, the latter being estimated from the sorption models initially optimized. The comparison of the calculated fluxes with the experimental data obtained for bi-layer and tri-layer films provided by the world-wide industrial company Arkema showed that the predictions were very satisfying. This approach was then extended to the simulation of the permeability of more complex multi-layer structures which are more representative of commercial fuel tanks; Répondant à une forte demande de sécurité, d’économie de poids et d’optimisation du volume utile, les réservoirs pour carburants sont actuellement généralement constitués d’une paroi barrière polymère multicouche visant à limiter les émissions de vapeurs dans l’atmosphère. Etre capable de prédire les perméabilités est primordial pour l’optimisation de telles structures. Grâce à des automates conçus au laboratoire, les mesures de sorption et de perméabilité ont été réalisées pour trois polymères leaders du domaine (PEHD, Liant et EVOH) et des mélanges modèles de carburants composés d’éthanol, d’iso-octane et de toluène. Les propriétés de sorption ont été modélisées par UNIQUAC et un nouveau modèle inédit SORPFIT. Les paramètres des lois de diffusion, de type TSVF2 ou Long généralisé, ont aussi été optimisés pour chaque polymère malgré une difficulté particulière pour l’EVOH. Une méthodologie originale a été ensuite proposée pour la prédiction des flux partiels des multicouches à partir des paramètres caractéristiques des monocouches correspondantes. Selon la nature et la disposition de chaque couche, deux cas de figures ont été identifiés : la limitation cinétique et la limitation thermodynamique du transfert, cette dernière étant estimée à partir des modèles de sorption initialement optimisés. La confrontation des calculs avec les mesures expérimentales réalisées pour des films bicouches et tricouches d’Arkema montre des prédictions très satisfaisantes. Cette approche est finalement étendue à la simulation de la perméabilité de structures multicouches plus complexes et plus représentatives des réservoirs pour carburants industriels
- Published
- 2010
6. Study of the kinetic and thermodynamic aspects controlling the permeability of gasoline models at the interface of two polymeric barrier materials : application to the optimization of fuel tanks
- Author
-
Zhao, Jing, UL, Thèses, Laboratoire de Chimie Physique Macromoléculaire (LCPM), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Lorraine, and Anne Jonquières
- Subjects
[SPI.OTHER]Engineering Sciences [physics]/Other ,SORPFIT ,Perméabilité ,Composites-Absorption et adsorption ,[SPI.OTHER] Engineering Sciences [physics]/Other ,UNIQUAC ,Fuel tank ,Essence ,Carburants ,Polymères-Perméabilité ,Multi-component transfer ,Films multicouches ,Multi-layer films ,Permeability ,Barrier materials ,Matériaux barrières ,Réservoir de carburants ,Sorption ,Gasoline ,Transfert multicomposant ,Réservoirs (récipients) - Abstract
Responding to a strong demand for security, weight reduction and volume optimization, the fuel tanks are currently usually made of polymer multi-layer barriers in order to limit vapour emissions into the atmosphere. The prediction of their permeability remains a world-wide critical challenge for the multi-layer optimization. Thanks to original semi-automated experimental set-ups, sorption and permeability measurements were carried out for three leading polymer materials (HDPE, EVOH and Binder) and model fuel mixtures of ethanol, iso-octane and toluene. The modelling of the sorption properties was successfully achieved by the UNIQUAC model and a new model called SORPFIT. The parameters of the diffusion laws according to the TSVF2 or the generalized Long models were also optimized for each polymer despite some difficulty with EVOH. An original methodology was then proposed for predicting the partial fluxes of polymer multi-layers from the characteristic parameters of the corresponding mono-layers. Depending on the nature and disposition of each layer, two scenarios were identified: the kinetics limitation and the thermodynamics limitation of mass transfer, the latter being estimated from the sorption models initially optimized. The comparison of the calculated fluxes with the experimental data obtained for bi-layer and tri-layer films provided by the world-wide industrial company Arkema showed that the predictions were very satisfying. This approach was then extended to the simulation of the permeability of more complex multi-layer structures which are more representative of commercial fuel tanks, Répondant à une forte demande de sécurité, d’économie de poids et d’optimisation du volume utile, les réservoirs pour carburants sont actuellement généralement constitués d’une paroi barrière polymère multicouche visant à limiter les émissions de vapeurs dans l’atmosphère. Etre capable de prédire les perméabilités est primordial pour l’optimisation de telles structures. Grâce à des automates conçus au laboratoire, les mesures de sorption et de perméabilité ont été réalisées pour trois polymères leaders du domaine (PEHD, Liant et EVOH) et des mélanges modèles de carburants composés d’éthanol, d’iso-octane et de toluène. Les propriétés de sorption ont été modélisées par UNIQUAC et un nouveau modèle inédit SORPFIT. Les paramètres des lois de diffusion, de type TSVF2 ou Long généralisé, ont aussi été optimisés pour chaque polymère malgré une difficulté particulière pour l’EVOH. Une méthodologie originale a été ensuite proposée pour la prédiction des flux partiels des multicouches à partir des paramètres caractéristiques des monocouches correspondantes. Selon la nature et la disposition de chaque couche, deux cas de figures ont été identifiés : la limitation cinétique et la limitation thermodynamique du transfert, cette dernière étant estimée à partir des modèles de sorption initialement optimisés. La confrontation des calculs avec les mesures expérimentales réalisées pour des films bicouches et tricouches d’Arkema montre des prédictions très satisfaisantes. Cette approche est finalement étendue à la simulation de la perméabilité de structures multicouches plus complexes et plus représentatives des réservoirs pour carburants industriels
- Published
- 2010
7. Effects of BRCA1 and BRCA2 gene mutations on female fertility among Chinese women: A systematic review and meta-analysis
- Author
-
Ma Ruichen, Ma Yuhua, and Zhao Jing
- Subjects
Microbiology ,QR1-502 ,Physiology ,QP1-981 ,Zoology ,QL1-991 - Abstract
Purpose: It is still inconsistent whether the mutations of BRCAs could reduce the female fertility by increasing the prevalence of breast and ovarian cancer. So we focus on the effects of BRCAs mutations onthe female fertility among Chinese women in this meta-analysis. Material and Method: The PubMed, Medline, Scopus, Embase, Science Direct, Web of Knowledge and China National Knowledge Infrastructure (CNKI) databases were methodically searched to eclectic relevant studies published from 2000 to 2022 using the key words“BRCA” and “mutation” and “female fertility or ovarian cancer or cervical cancer or breast cancer” and “China or Chinese or Asia or Asian”. The random effects models in RevMan 5.3 software were used to include and evaluate both longitudinal research and randomized controlled trials. Results: This meta-analysis included 13 studies with a total of 10689 Chinese participants. Contact the control group, positive correlations between the mutations of BRCAs and female cancers were shown among the Chinese women from 35 to 60 years (OR=5.26) (P
- Published
- 2023
- Full Text
- View/download PDF
8. Research on Ideological and Political Teaching Reform of Electronic Technology Courses in Vocational and Technical Education Based on CDIO Concept
- Author
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Qi Li-hua, Xing Dong-qiu, Zhao Jing, and Gao Xin-wei
- Subjects
Social Sciences - Abstract
Starting from the actual situation of Ideological and political teaching of electronic technology courses and based on the CDIO Engineering Education Concept, this paper deeply excavates the ideological and political elements in the theoretical teaching and practical links, constructs the curriculum ideological and political teaching mode, integrates the curriculum ideological and political elements into every link of teaching, summarizes the specific methods of the implementation of curriculum ideological and political teaching, explores the reform path of Ideological and political teaching of electronic technology courses, and realizes value guidance, knowledge education The organic unity of ability training.
- Published
- 2023
- Full Text
- View/download PDF
9. Numerical simulation of slope stability of the abandoned dreg site
- Author
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Wang Xiao, Deng Zhigang, Ni Dong, Zhang Dong, and Zhao Jing
- Subjects
Environmental sciences ,GE1-350 - Abstract
A mathematical model of No. 1 abandoned dreg site of the newly-built highway from Xiangle village, Pingyao County to Hougou village, Qinyuan County was developed using GeoStudio software. The stability of the abandoned dreg site was simulated and analyzed under rainstorm. As a result, the influence of rainfall infiltration on slope seepage field is not limited to the rainfall process. The slope stability coefficient decreases significantly during the rainfall and the decreases slightly after the rainfall stopped due to continuous rainwater seepage. The minimum safety coefficient is 2.292 at 24h, greater than the allowable value, which demonstrates that the slope is stable.
- Published
- 2021
- Full Text
- View/download PDF
10. Screening and application of microbial inoculants for sludge composting in expressway service area of northwest China
- Author
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Zhao Jing, Wang Xiao wei, Fan Hua, Fan Chun ping, Shao She gang, and Xie Jian bo
- Subjects
Environmental sciences ,GE1-350 - Abstract
Taking sludge in northwest China’s expressway service area as the research object, four dominant strains, including Bordetella sp. M05, Ochrobactrum sp. M06, Bacillus subtilis M07 and Staphylococcus sciuri M09, were obtained through specific screening. These microbes were prepared into inoculants and effectively promoted sludge composting. The time for the fermentation temperature of the composting process to reach 50°C was 3 days earlier than that of the control group. The high temperature (>50°C) lasted for 12 days and the highest temperature reached 63.5°C. After composting, the product was dark in color, free from odor, and the contents of organic matter, nitrogen, phosphorus and potassium increased by 44.1%, 125.9%, 311.1% and 269.2%, respectively, which made the composted product meet standards of GB/T 23486–2009 Sludge for Landscaping.
- Published
- 2021
- Full Text
- View/download PDF
11. A Comprehensive Management Model Based on Modularization Thought
- Author
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Tan Ting Ting, Zhao Chong, Du Li Hong, and Zhao Jing
- Subjects
Environmental sciences ,GE1-350 - Abstract
The general modular management theory takes organizational structure, work flow and product design and production as the core. In practice, it only pays attention to a certain aspect of modularization, and does not establish a comprehensive and unified modular management system. In this context, this article, guided by modular thinking, constructs a comprehensive management model based on modular thinking, and elaborates on the basic management structure of the modular management system. Meanwhile, this paper discusses the practical requirements of promoting modular management mode from the perspective of system, stability and moderation. It is hoped that this research can promote the theoretical innovation of comprehensive modular management and also provide a reference for the innovative practice of enterprise business models.
- Published
- 2021
- Full Text
- View/download PDF
12. Evaluation and Optimization of Human Resource Supply in Packaging Design Project
- Author
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Ye Baozhong, Chen Jian, Zhao Jing, and Zeng Qingguang
- Subjects
Environmental sciences ,GE1-350 - Abstract
In order to solve the problem of selection of human resource provider for the demander in package design project, firstly, the evaluation index system of provide side is established, and the entropy weight method is used to calculate the objective weight of the evaluation index; secondly, the subjective weight is solved by the five scale valuation method, and the comprehensive weight with subjective and objective significance is obtained; then, with the help of the ideal point method, the provide side is evaluated, which can provide a reference for the choice of the demander; finally, an example is given to verify the effectiveness and practicability of the method.
- Published
- 2021
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13. Analysis of the impact of road construction dust on glacier environment
- Author
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Zhao Jing, Shao Shegang, Ni Dong, Shang Xiaodong, Liu Xiaofeng, Zhang Quan, and Yu Xiaojuan
- Subjects
Environmental sciences ,GE1-350 - Abstract
Construction dust falls to the snow cover and the surface of the glacier to form a fouling layer to absorb more solar radiation and reduce the intensity of surface albedo, thereby accelerating the melting of the glacier, which is the main factor affecting the glacial environment in the Highway construction. This article adopts the combination method of wind tunnel experiment and numerical simulation was used to calculate the impact range of construction dust. The results show that with increasing of particle size, the diffusion range of dust decreased while the settlement speed increased. High dust concentration area (> 4mg / m3) is generally distributed within 1000m around the construction site. The specific extension direction is directly related to the local terrain and wind direction, and the height direction is generally not more than 300m. According to the above simulation results, for preventing and reducing the impact of highway construction on the glacial environment, the requirements of route selection and construction dust control measures was put forward, which played an important role and significance in guiding the highway design and construction and reducing the impact of highway construction on the glacial environment.
- Published
- 2020
- Full Text
- View/download PDF
14. Discussion on Integrated Design of Emergency Storage Facilities for Dangerous Chemicals Transportation Accidents and Bridge Drainage Run off Treatment Facilities of Expressway
- Author
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Zhao Jing, Shao Shegang, Ni Dong, Yuan Minmin, Zhang Dong, and Wang Dan
- Subjects
Environmental sciences ,GE1-350 - Abstract
Based on the investigation on the collection and treatment of the runoff from the bridge-deck of some expressways involving sensitive water bodies, this paper proposed an integrated design idea of the emergency storage facility and the bridge-deck rainwater runoff treatment facility for the transportation accident of dangerous chemicals in the expressway. The integrated design idea improves the disadvantages of simultaneous treatment of rainwater and accident-water in the bridge-deck runoff treatment system. The process flow, plane layout, functional unit volume design, conversion device, and control system involved in the integrated design are discussed.
- Published
- 2020
- Full Text
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15. Coupling matrix synthesis of general chebyshev filters
- Author
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Qi Lihua, Xing Dongqiu, Wang Rui, Qi Xinshe, and Zhao Jing
- Subjects
general chebsyshev filters ,couplimg matrix ,synthesis ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
A single optimization algorithm based on SolvOpt that synthesizes coupling matrices for cross-coupled microwave filters is presented. The rules for setting initial values of SolvOpt are proposed to find global minimum of the cost function. SolvOpt method provides faster convergence and higher accuracy to find the final solution compared with hybrid optimization algorithms. Application examples illustrate the excellent performance and the validity of this method.
- Published
- 2020
- Full Text
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16. The design of computer controlled ground information transmission down platform in drilling
- Author
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Xing Dongqiu, Qi Lihua, Zhao Jing, and Wang Yi
- Subjects
rotation-guided closed-loop drilling ,the down link command ,experimental platform ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
In order to improve the drilling efficiency and avoid the disadvantages of manual operation, the method of sending the surface intervention instruction with computer instruction is researched. Based on the similarity of liquid flow, a set of hydraulic circulation system is used to simulate the drilling process, selected the key components, designed and built the intelligent drilling system indoor experiment platform; Define different commands with the length of the time and decode them and carried out the sending command experiment. The results show that the platform can successfully send the command to the downhole under the condition of non-stop drilling, which is the attitude intervention, command coding and Weak signal detection in the intelligent drilling system provides a new platform.
- Published
- 2020
- Full Text
- View/download PDF
17. Multi-source fault identification based on combined deep learning
- Author
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Xing Dongqiu, Chen Rui, Qi Lihua, Zhao Jing, and Wang Yi
- Subjects
multi-source fault ,stacked denoising autoencoder ,multiple classifier combination ,deep learning ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
This study establishes a multi-source fault identification method based on a combined deep learning strategy to identify a multi-source fault effectively in the fault diagnosis of complex industrial systems. This framework is composed of feature extraction and classifier design. In the first state, the signal is transformed to the time-frequency domain and the time-frequency feature is learned using stacked denoising autoencoders. A learning method that consists of unsupervised pre-learning and supervised fine-tuning is used to train this deep model. In the second state, a model for an ensemble multiple support vector machine classifier is created to recognize fault information. Ten types of rolling bearing signals were adopted in a simulation experiment to validate the effectiveness of the proposed framework. The results demonstrate that the joint model helps to obtain higher recognition accuracy.
- Published
- 2020
- Full Text
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18. Permeability of EVOH Barrier Material Used in Automotive Applications: Metrology Development for Model Fuel Mixtures
- Author
-
Zhao Jing, Kanaan Charbel, Clément Robert, Brulé Benoît, Lenda Henri, and Jonquières Anne
- Subjects
Chemical technology ,TP1-1185 ,Energy industries. Energy policy. Fuel trade ,HD9502-9502.5 - Abstract
EVOH (Ethylene-Vinyl Alcohol) materials are widely used in automotive applications in multi-layer fuel lines and tanks owing to their excellent barrier properties to aromatic and aliphatic hydrocarbons. These barrier materials are essential to limit environmental fuel emissions and comply with the challenging requirements of fast changing international regulations. Nevertheless, the measurement of EVOH permeability to model fuel mixtures or to their individual components is particularly difficult due to the complexity of these systems and their very low permeability, which can vary by several orders of magnitude depending on the permeating species and their relative concentrations. This paper describes the development of a new automated permeameter capable of taking up the challenge of measuring minute quantities as low as 1 mg/(m2.day) for partial fluxes for model fuel mixtures containing ethanol, i-octane and toluene at 50°C. The permeability results are discussed as a function of the model fuel composition and the importance of EVOH preconditioning is emphasized for accurate permeability measurements. The last part focuses on the influence of EVOH conditioning on its mechanical properties and its microstructure, and further illustrates the specific behavior of EVOH in presence of ethanol oxygenated fuels. The new metrology developed in this work offers a new insight in the permeability properties of a leading barrier material and will help prevent the consequences of (bio)ethanol addition in fuels on environmental emissions through fuel lines and tanks.
- Published
- 2015
- Full Text
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19. Effect of Substrate Ratios and the Species of Sugar on the Antioxidant Activity of Glycosylated Products of the Rana Debris Collagen Peptide
- Author
-
Kang Naixin, Song Hongxin, Zhang Wenyu, Zhao Jing, Zhang Menghan, Xiong Wenxin, and Xi Chunyu
- Subjects
Environmental sciences ,GE1-350 - Abstract
The active peptide (molecular weight < 3500 Da) of the enzymatic hydrolysis from Rana debris is used as a raw material of glycosylation. The peptide can be affected by environmental factors, such as pH and temperature, which can destroy structural and functional properties, so the peptide is usually modified by glycosylation. To investigate the effects of glycosylation on the antioxidant activity of Rana Debris Collagen Peptide (RDCP), glycosylated compounds were prepared using different ratios of RDCP and xylose or glucose by the Maillard reaction. The results indicated that the peptide-xylose compound (PXC) showed higher antioxidant activity than the peptide-glucose compound (PGC), and RDCP and xylose heated at a ratio of 1:4 showed good antioxidant properties. The correlation between the glycosylation degree and antioxidant activity was strong. These results indicated that glycosylation can enhance the antioxidant activity of RDCP. Such glycosylated products can be used in the field of food research.
- Published
- 2019
- Full Text
- View/download PDF
20. Study on Vibration Tapping for SiCp/Al Particle-reinforced Metal Matrix Composite
- Author
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Liu Yang and Zhao Jing
- Subjects
Metal matrix composite ,Low-frequency torsional vibration tapping ,Tap service life ,Thread quality ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Aiming at answering the question that low tap service life of ordinary tapping and bad thread quality on particle-reinforced metal matrix composite SiCp/Al, the reason of question and the mechanism of low-frequency torsional vibration tapping are analyzed. The experiments were carried out to compare the tap service life and the thread quality of vibration tapping with ordinary tapping without cutting fluid. It indicates that vibration tapping could make tapping torque reduce greatly, the tap service life could be prolonged twice comparing with continuous tapping without cutting fluid, and could ensure the good thread quality. Moreover, it promotes metal matrix composite’s further application.
- Published
- 2018
- Full Text
- View/download PDF
21. Reinforcing high-density polyethylene by phenolic spheres
- Author
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Zhu Lien, Wu Di, Wang Baolong, Zhao Jing, Liu Meihua, Jin Zheng, and Zhao Kai
- Subjects
Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Phenolic spheres are synthesized through resorcinol and formaldehyde. The phenolic spheres were blended with HDPE to prepare binary composites. The rheological properties and mechanical properties of the composites were studied. The composite materials have higher tensile strength and impact strength than pure HDPE, which extends the application of the material.
- Published
- 2018
- Full Text
- View/download PDF
22. Model-plant Mismatch Detection of Nonlinear Processes Based on Multi-model LPV Model
- Author
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Huang Jiangyin and Zhao Jing
- Subjects
Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
The performance of model-based controller depends on the quality of the identified model. Accurate detection of the channel with model-plant mismatch can avoid re-identification of the entire multivariable system, thereby reducing the disturbance to normal production caused by identification test. A model-plant mismatch detection methodology for nonlinear systems based on LPV (Linear Parameter Varying) model was proposed in this work. The detection was performed only when the control performace becomes worse. Firstly, the LPV model based on multi-model interpolation was adopted to represent the nonlinear process. Then partial correlation coefficients between the model residuals and the inputs of the models at each of the operation points were analyzed to diagnose the model-plant mismatch of the local models. Finally, the LPV model was re-identified by updating the local mismatch models and re-estimating the model weighing parameters. The experimental results show that the partial correlation coefficient of the mismatch model is obviously larger than that of the exact model, which can point out the channel with model-plant mismatch correctly.The proposed method is suitable for the nonlinear processes which have relative steady states in their operating trajectorys.
- Published
- 2017
- Full Text
- View/download PDF
23. Enhancing the Precision of Timing Gear Used in Automobile by Making Use of Azotizing Deformation
- Author
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Wei Yangang, Liu Huifang, and Zhao Jing
- Subjects
Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Statistic analysis about the effect of heat treatment deformation on tooth profile deviation distribution of the timing gear used in automobile is done with mathematical statistics. Based on the research on the effect of the heat treatment deformation on tooth profile deviation, helical deviation and common normal length etc, the processing measure, tolerance and correcting quantity before and after azotizing treatment can be adjusted to optimize the gear process and to enhance processing precision of the gear.
- Published
- 2016
- Full Text
- View/download PDF
24. A New Optimal Control Algorithm for Quad-rotor Helicopter with State Constraints via Sliding-mode Control
- Author
-
Zhao Jing, Yang Pu, Zhang Zecheng, and Liu Jianwei
- Subjects
flight control system ,state constraint ,sliding-mode control ,optimal control ,quad-rotor helicopter ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
This paper proposes a strategy of a new optimal sliding-mode control for flight control system with state constraints so that the system guarantees the optimal performance index. Besides, the strategy ensures strong robustness to the internal parametric uncertainty and the external disturbances. In order to have fast transient response speed as well as good tracking accuracy, the integral of the time multiplied by the absolute displacement tracking error is introduced as the performance index. By analyzing the state constraints which are specifically the velocity tracking error constraint and the acceleration tracking error constraint, and the performance index, the parameters of sliding-mode surface and control law are obtained. Finally, the authors conduct the semi physical simulation on Qball-X4 quad-rotor helicopter, showing the effectiveness of the proposed strategy.
- Published
- 2015
- Full Text
- View/download PDF
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