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Search Results: 1 - 10 of 17158 matches for " Chenghua Fu "
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Quantity Detection of Steel Bars Based on Deep Learning  [PDF]
Han Yang, Chenghua Fu
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105784
Abstract:
In the actual production environment, the number of steel bars in the con-struction site is mainly counted manually. For the special task of steel bar detection, a detection and counting method based on depth learning is proposed. The method is applied to the actual production environment in-stead of the traditional time-consuming and labor-consuming manual counting method. By comparing the traditional detection algorithm with the one-stage and two-stage detection in depth learning. After the algorithm and considering the efficiency of the model, the improved detection algorithm is proposed to adapt to the special task of steel bar detection. In the final evaluation index, the improved one-stage detection algorithm is superior to the improved detection algorithm in the special task of steel bar detection, showing the improvement of performance, and compared with the single-stage detection algorithm. The law has also been improved to a certain extent.
Induction of Superhydrophobicity in a Cellulose Substrate by LbL Assembly of Covalently Linked Dual-Sized Silica Nanoparticles Layers  [PDF]
Chenghua Yu, Feng Wang, Lucian A. Lucia, Shiyu Fu
Advances in Materials Physics and Chemistry (AMPC) , 2017, DOI: 10.4236/ampc.2017.712031
Abstract: Micro/nano texturized oxidized cellulose membranes (MNOCM) were constructed by layer-by-layer (LbL) assembly in which a base cellulose film was modified by covalent linkages to amino-functionalized silica nanoparticles (amino-SiO2 NPs, 260 nm diameter) and epoxy-functionalized silica nanoparticles (epoxy-SiO2 NPs, 30 nm diameter). The amino-SiO2 NPs grafted onto the MNOCM surface through a standard amidation reaction between the amino groups of the SiO2 NPs and the carboxyl groups of the MNOCM surface in the presence of EDC and NHS consequently forming a first layer of large (260 nm) nanoparticles; subsequently, it was reacted with smaller (30 nm) epoxy-SiO2 NPs. Continuous repetitions of these alternating sized silica NPs through a standard LbL approach lead to a highly micro/nano-texturized MNOCM film as shown by SEM, which was ultimately sealed with a layer of hydrophobic PFOTES (1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane). Although the wettability of MNOCM was no longer hydrophilic, it was found that at five layers deep of NPs, it became superhydrophobic as evidenced by a water contact angle of 151° ± 2° and slide angle of 4°. The change in wettability was attributed to increases in final LbL layer surface roughness induced by the sufficient LbL layering of alternating sizes of NPs akin to what is observed in a lotus leaf surface. It was also noted that these superhydrophobic-MNOCM materials displayed good self-cleaning.
Research on Three-phase Voltage Type PWM Rectifier System Based on SVPWM Control
Haoran Shi,Wei Xu,Chenghua Fu,Yao Yang
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: The fundamental principle of SVPWM is introduced in this study. The design on the structure of three-phase voltage type PWM rectifier system based on SVPWM control was also discussed. Then we calculate the DC capacitor and AC side inductance. The computer simulation tool MATLAB/Simulink is taken and the result is shown in the end. The result indicates that the design of such platform is feasible.
BACK ANALYSIS STUDY ON INITIAL GEOSTRESS FIELD OF DAM SITE FOR XILUODU HYDROPOWER PROJECT
溪洛渡水电站坝区初始地应力场反演分析研究

FU Chenghua,WANG Weiming,CHEN Shenghong,
付成华
,汪卫明,陈胜宏

岩石力学与工程学报 , 2006,
Abstract: Initial geostress is one of the most important factors in the design and construction of the geotechnical engineering. According to the measured geostress data, there are many methods of calculating initial geostress field with different advantages. According to the measured geostress data from Xiluodu Hydropower Project, through 3D FEM combined with the linear multivariate regression analysis principle, the neural network as well as the genetic algorithms, the geostress field back analysis are conducted. It is shown that the back analysis results by the three kinds of methods are very close, and all the methods can simulate the real geostress field. The further analysis shows that, since the yield zone in the rock mass is small, and nonlinear character of the initial geostress field of dam site is faint; the linear multivariate regression analysis results are acceptable. The results also show that, under the condition of accurate results, the linear multivariate regression analysis is of more merits, that is, more convenient, rapider, easier, only solution, compared with the neural network method and the genetic algorithms.
Necessary and Sufficient Condition for the Existence of Solutions to a Discrete Second-Order Boundary Value Problem
Chenghua Gao
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/951251
Abstract: This paper is concerned with the existence of solutions for the discrete second-order boundary value problem Δ2(?1)
Existence of solutions to p-Laplacian difference equations under barrier strips conditions
Chenghua Gao
Electronic Journal of Differential Equations , 2007,
Abstract: We study the existence of solutions to the boundary-value problem $$displaylines{ Delta(phi_p(Delta u(k-1)))=f(k,u(k),Delta u(k)),quad kin mathbb{T}_{[1, N]}, cr Delta u(0)=A, quad u(N+1)=B, }$$ with barrier strips conditions, where N is a fixed natural number greater than 1, $phi_p(s)=|s|^{p-2}s$, p greater than 1.
Positive Solutions of a Nonlinear Fourth-Order Dynamic Eigenvalue Problem on Time Scales
Hua Luo,Chenghua Gao
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/798796
Abstract: Let be a time scale and ,∈, <2(). We study the nonlinear fourth-order eigenvalue problem on , Δ4()=?()((),Δ2()), ∈[,2()], ()=Δ(())=Δ2()=Δ3(())=0 and obtain the existence and nonexistence of positive solutions when 0<≤? and >?, respectively, for some ?. The main tools to prove the existence results are the Schauder fixed point theorem and the upper and lower solution method.
Practice and Reflection on Developing Food Banks in XI CHANG
Chenghua Liu,Shengyu He
Economic Management Journal , 2012,
Abstract: Food bank is a kind of savings service for the grain enterprises involving the unused grain in the business turnover to control the grain resources after the revolution of purchase and sale food market. This paper talks about the necessity and feasibility of promoting the food bank in XI CHANG from perspectives of increasing farmers’ income, declining food consumption and facilitating people’s life and from perspectives of the background of food bank development, the successful experience domestically, the success of the pilot and the support of national policies and regulations respectively, and analyzes the problems the food bank brings and at last puts forward strategies to accelerate the promotion of the food bank combining the practical situation of XI CHANG.
Existence and Multiple Solutions for Nonlinear Second-Order Discrete Problems with Minimum and Maximum
Ma Ruyun,Gao Chenghua
Advances in Difference Equations , 2008,
Abstract: Consider the multiplicity of solutions to the nonlinear second-order discrete problems with minimum and maximum: , , , , where are fixed numbers satisfying are satisfying , , .
Existence and Multiple Solutions for Nonlinear Second-Order Discrete Problems with Minimum and Maximum
Ruyun Ma,Chenghua Gao
Advances in Difference Equations , 2008, DOI: 10.1155/2008/586020
Abstract: Consider the multiplicity of solutions to the nonlinear second-order discrete problems with minimum and maximum: ”2u(k ¢ ’1)=f(k,u(k), ”u(k)), k ¢ T, min{u(k):k ¢ T^}=A, max ¢ {u(k):k ¢ T^}=B, where f:T — ¢ 2 ¢ ’ ¢ , ¢ € ‰ ¢ € ‰a,b ¢ ¢ are fixed numbers satisfying b ¢ ‰ ¥a+2, ¢ € ‰ ¢ € ‰and ¢ € ‰ ¢ € ‰A,B ¢ ¢ are satisfying B>A, ¢ € ‰ ¢ € ‰T={a+1, ¢ € |,b ¢ ’1}, ¢ € ‰ ¢ € ‰T^={a,a+1, ¢ € |,b ¢ ’1,b}.
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