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Search Results: 1 - 10 of 41766 matches for " Jian Di "
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Application of Improved Deep Auto-Encoder Network in Rolling Bearing Fault Diagnosis  [PDF]
Jian Di, Leilei Wang
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.67005
Abstract: Since the effectiveness of extracting fault features is not high under traditional bearing fault diagnosis method, a bearing fault diagnosis method based on Deep Auto-encoder Network (DAEN) optimized by Cloud Adaptive Particle Swarm Optimization (CAPSO) was proposed. On the basis of analyzing CAPSO and DAEN, the CAPSO-DAEN fault diagnosis model is built. The model uses the randomness and stability of CAPSO algorithm to optimize the connection weight of DAEN, to reduce the constraints on the weights and extract fault features adaptively. Finally, efficient and accurate fault diagnosis can be implemented with the Softmax classifier. The results of test show that the proposed method has higher diagnostic accuracy and more stable diagnosis results than those based on the DAEN, Support Vector Machine (SVM) and the Back Propagation algorithm (BP) under appropriate parameters.
Dimerization of 1-Phenyl-1H-Tetrazole-5-Thiol over Metalloporphyrin Catalysts  [PDF]
Ya-hong Wu, Jun-wei Yang, Yan Yan, Shan-ling Tong, Di Tan, Jian Yu, Lin Yu
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.23047
Abstract: In an alkaline methanol solution, dimerization of 1-phenyl-1H-tetrazole-5-thiol (HL) was carried out over metalloporphyrin catalysts under mild conditions. The dimer product, 1,2-bis (1-phenyl-1H-tetrazol-5-yl) disulfane (L-L), was characterized by determinations of infrared (IR), HPLC, NMR and elementary analysis respectively. In situ UV-Vis spectroscopic analysis and cyclic voltammetric (CV) determinations suggested that the active intermediate for L-L formation is an axially ligated complex, RS-MnTHPP, which decomposes into a MnTHPP molecule and a stable radical (SR) for coupling to form the disulfane. Meanwhile MnIITHPP molecule can be oxidized easily to form MnTHPP species again by oxygen from the air for using in next catalytic circle.
A New Reduced Stabilized Mixed Finite-Element Method Based on Proper Orthogonal Decomposition for the Transient Navier-Stokes Equations
Aiwen Wang,Jian Li,Zhenhua Di,Xiangjun Tian,Dongxiu Xie
Mathematical Problems in Engineering , 2011, DOI: 10.1155/2011/895386
Abstract: A reduced stabilized mixed finite-element (RSMFE) formulation based on proper orthogonal decomposition (POD) for the transient Navier-Stokes equations is presented. An ensemble of snapshots is compiled from the transient solutions derived from a stabilized mixed finite-element (SMFE) method based on two local Gauss integrations for the two-dimensional transient Navier-Stokes equations by using the lowest equal-order pair of finite elements. Then, the optimal orthogonal bases are reconstructed by implementing POD techniques for the ensemble snapshots. Combining POD with the SMFE formulation, a new low-dimensional and highly accurate SMFE method for the transient Navier-Stokes equations is obtained. The RSMFE formulation could not only greatly reduce its degrees of freedom but also circumvent the constraint of inf-sup stability condition. Error estimates between the SMFE solutions and the RSMFE solutions are derived. Numerical tests confirm that the errors between the RSMFE solutions and the SMFE solutions are consistent with the the theoretical results. Conclusion can be drawn that RSMFE method is feasible and efficient for solving the transient Navier-Stokes equations. 1. Introduction Mixed finite-element (MFE) methods are one of the most important approaches for solving the nonstationary Navier-Stokes equations [1–3]. However, some fully discrete MFE formulations for the nonstationary Navier-Stokes equations involve generally many degrees of freedom. In addition, the importance of ensuring the compatibility of the approximations for the velocity and pressure by satisfying the so-called inf-sup condition (LBB condition) is widely understood. Thus, an important problem is how to avoid the lack of the LBB stability and simplify the computational load by saving time-consuming calculations and resource demands in the actual computational process in a way that guarantees a sufficiently accurate numerical solution. Proper orthogonal decomposition (POD) is an effective method for approximating a large amount of data. The method essentially finds a group of orthogonal bases from the given data to approximately represent them in a least squares optimal sense. In addition, as the POD is optimal in the least squares sense, it has the property that the model decomposition is completely dependent on the given data and does not require assuming any prior knowledge of the process. Combined with a Galerkin projection procedure, POD provides a powerful method for deriving lower dimensional models of dynamical systems from a high or even infinite dimensional space. A
Biogenic Hierarchical TiO2/SiO2 Derived from Rice Husk and Enhanced Photocatalytic Properties for Dye Degradation
Dalong Yang, Tongxiang Fan, Han Zhou, Jian Ding, Di Zhang
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0024788
Abstract: Background Rice husk, an agricultural bioresource, is utilized as a non-metallic bio-precursor to synthesize biogenic hierarchical TiO2/SiO2 (BH-TiO2/SiO2) and the products are applied to dye degradation. Methodology/Principal Findings The as-prepared BH-TiO2/SiO2 samples are characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), nitrogen-adsorption measurement, UV-vis spectroscopy and electronic paramagnetic resonance (EPR). The results show that BH-TiO2/SiO2 possesses both anatase and rutile phases with amorphous SiO2 as background, which contains mesopore structure, and nitrogen derived from original rice husk is self-doped into the lattice. Besides, the light-harvesting within the visible-light range of BH-TiO2/SiO2 has been enhanced. Moreover, the catalytic activity of BH-TiO2/SiO2 has been proven by EPR, and both the photocatalytic activity and stability of BH-TiO2/SiO2 are improved as well, which has been illustrated by cycled degradation of methylene blue dye under irradiation. Conclusions/Significance This work provides a good way to combine natural hierarchical porous structure with synthetic material chemistry based on available biomass in the vast natural environment for the sustainable development of human society, and extends potentials of biomass in applications such as photocatalysts, sunlight splitting water and so forth.
Research for the Crack Dynamic Monitoring of Crank Shaft of Marine Diesel Engine Based on Magnetic Memory Technology
L. Jian-Bin,Z. Hai-Feng,Sun Di
Information Technology Journal , 2012,
Abstract: Diesel engine crankshaft is one of the most important parts and crankshaft fatigue fracture is a major failure. In order to alert fatigue fracture of crankshaft to prevent accidents, diesel engine crankshaft dynamic monitoring based on metal magnetic memory testing technology is given as well as detection technology and the results was studied in this study and the appropriate conclusions was drawn.
A new approach to develop complicated superalloy castings
WU Jian-tao,FENG Di,LI Jun-tao
China Foundry , 2006,
Abstract: An integrative computer aided investment casting (CAIC) technology for making complicated superalloy castings was described. Key processes of CAIC were discussed including the choice of SLS (Selectively Laser Sintering) materials, sintering parameters, solidification simulation and gating and risering system optimization. Using CAIC process, many large-sized quality superalloy castings with complicated shape and thin wall have been produced successfully and economically in Central Iron & steel Research Institute (CISRI).
Infrared characteristics of sources associated with OH, H$_{2}$O, SiO and CH$_{3}$OH masers
Jarken. Esimbek,Jian. Jun. Zhou,Gang. Wu,Xin. Di. Tang
Physics , 2013,
Abstract: We collect all published OH, H2O, SiO and CH3OH masers in literature. The associated infrared sources of these four masers were identified with MSX PSC catalogues. We look for common infrared properties among the sources associated with four masers and make a statistical study. The MSX sources associated with stellar OH, stellar H2O and SiO masers concentrated in a small regions and the MSX sources associated with interstellar OH, interstellar H2O and CH3OH masers also concentrated in a small regions in an [A]-[D].vs.[A][-[E] diagram. These results give us new criterion to search for coexisting stellar maser samples for OH, H2O and SiO masers and interstellar maser samples for OH, H2O and CH3OH masers.
The correlation between variation of visual acuity and the anterior chamber depth in the early period after phacoemulsification
Kai-jian CHEN,Jian YE,Rong-di YUAN,Xiao-fan CHEN
Medical Journal of Chinese People's Liberation Army , 2011,
Abstract: Objective To investigate the correlation between the visual acuity variation and the anterior chamber depth in the early period after phacoemulsification.Methods Thirty-six eyes of 32 patients with age-related cataract underwent 3.2mm clear corneal incision phacoemulsification and intraocular lens(IOL) implantation.The visual acuity was examined and horizontal curvature(K1),vertical curvature(K2),corneal astigmatism,and anterior chamber depth were measured with IOL-master preoperatively and also on 1,3,7 and 15 postoperative days.The changes in parameters were compared,and the correlations among visual acuity,corneal astigmatism and anterior chamber depth were analyzed.Results Before operation and 1d,3d,7d and 15d after operation,the corneal astigmatism was-0.87±0.40D,-1.92±1.38D,-1.69±1.13D,-1.45±0.79D and-1.36±0.74D;the anterior chamber depth was 3.08±0.35mm,4.04±0.38mm,4.28±0.29mm,4.22±0.17mm and 4.22±0.16mm;the visual acuity was 0.18±0.10,0.44±0.14,0.59±0.12,0.61±0.11 and 0.62±0.14.Significant difference was found between pre-operative and postoperative visual acuity,corneal astigmatism and anterior chamber depth,and it was also found in corneal astigmatism between 1d and 15d post operation(P < 0.05),as well as in anterior chamber depth and visual acuity between 1d and 3d post operation(P < 0.05).A positive correlation was found between visual acuity and corneal astigmatism on 1d(r=0.42,P < 0.05),3d(r=0.35,P < 0.05) and 7d(r=0.35,P < 0.05) post operation;and a negative correlation was found between visual acuity and anterior chamber depth on 3d(r=-0.29,P < 0.05),7d(r=-0.43,P < 0.01) and 15d(r=-0.37,P < 0.05) post operation.Conclusion Both the corneal astigmatism and the anterior chamber depth are correlated with the visual acuity variation in the early period after phacoemulsification.
Fabrication and Anticorrosion Property of Superhydrophobic Surfaces with Hierarchical Structure through an Organic-inorganic Self-assemble Process
DI Zhi-Yong, HE Jian-Ping, ZHOU Jian-Hua, SUN Dun, WANG Tao
无机材料学报 , 2010, DOI: 10.3724/sp.j.1077.2010.00765
Abstract: A superhydrophobic surface was obtained by using g-aminopropyltriethoxylsilane (KH550) as a linker from organic-inorganic self-assemble process. By utilizing silane with amine functional group and Si-hydroxy functional group, bionic superhydrophobic surfaces with hierarchical microsphere/nanofiber structures were prepared on metal surfaces. The corrosion behavior of the composite film was investigated by electrochemicial impedance spectroscope (EIS). The maximal contact angle for water on the composite film is about 152°. Scanning electron microscope (SEM). Test result shows that the lotus-like film has microsphere/nanofiber hierarchical structure. The surface of the film forms a composite framework which plays an essential role in trapping air between the solid substrate and the liquid droplets to get high contact angle and low roll angle. Electrochemical corrosion measurements results indicate that the composite film has excellent corrosion protection for mild steel. The corrosion current of mild steel is nearly 1′104 times than that of the sample coated with the composite film, while the corrosion impedance increases dramatically. It suggests that the superdrophobic film has good corrosion resistance.
Study on Family Rules in the Ming and Qing Dynasties  [PDF]
Di Wang
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.211019
Abstract: In the Ming and Qing Dynasties, the state laid emphasis on the village society control, encouraging families at different places to set norms restraining family members in genealogical record and vesting family elders with power to decide and enforce these norms. It was in this period that the family rules achieved rapid development, having increasingly mature content and form and general support from authorities; therefore, the Ming and Qing Dynasties became a typical time for the development of ancient family rules.
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