Research on Laser Thread Form Bending of Stainless Steel Tube

Fuqiang Li,Shourong Liu,Aiping Shi,Qiulu Chu,Qiang Shi,Yuxiang Li 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.6

Compared to traditional bending methods, laser bending can yield products with better shapes and higher quality using the simpler equipment. In this paper, the mechanism of Laser-assisted tube bending is elaborated, and then the influence of processing parameters (including laser power, scanning speed, spot diameter, and scanning times) on the bending angle is studied with both the finite element method and experiments. The bending angle increases with an increase of laser power and spot diameter and with a decrease in the scanning speed. Three-dimensional (3D) thread form bending can be achieved by planning the optimal route, scanning parameters, and the number of laser scans. In contrast to the desired thread diameter of 20 mm and thread pitch of 180 mm, the resulting thread of the stainless steel tube is close to the target shape with errors of 3% for thread diameter and 2.5% for thread pitch, which are both in an acceptable range and thus verify the validity of the parameters selection and route planning method.

Dual-side Event-triggered Output Feedback H∞ Control for NCS with Communication Delays

Fuqiang Li,Lisai Gao,Gensheng Dou,Baozhou Zheng 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.1

This paper studies the dual-side event-triggered output feedback H∞ control for networked control systemwith network-induced delays. Unlike continuous-time event-triggered mechanism (ETM) or state-dependent ETM,the discrete dual-side ETMs are firstly proposed by using plant output and controller output, respectively, whicheffectively reduce transmission rate of sampled data in both sensor-to-controller and controller-to-actuator channels. Then, the closed-loop system is modelled as a time-delay system, which characterizes effects of the dual-sideETMs and networked-induced delays in a unified framework. Based on the system model, asymptotic stabilitycriterion satisfying H∞ performance is derived, and conservatism is reduced by the delay decomposition methodand reciprocally convex approach. Moreover, a co-design scheme is presented to design the dual-side ETMs andcontroller simultaneously, which is more convenient than two-step design method requiring controllers to be givena priori. Finally, examples confirm effectiveness of the proposed method.

Fault Diagnosis Method of Escalator Step System Based on Vibration Signal Analysis

Fuqiang You,Dianlong Wang,Chunhua Chen,Guanghai Li 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.10

For the problem that escalator fault diagnosis is difficult to realize, this paper proposes a fault diagnosis method based on vibration signal analysis. The vibration signal is collected from three parts: step guide rail, main drive shaft and main engine. The wavelet threshold denoising algorithm based on Ensemble Empirical Mode Decomposition (EEMD) is used to denoise the vibration signal. The signal characteristics are extracted, and the fault detection is performed through the Support Vector Machine (SVM) fault detection model. For the fault signal, the improved envelope spectrum analysis method is used to extract the characteristic frequency and corresponding amplitude to form the characteristic vector, and the Support Vector Machine for Particle Swarm Optimization (PSO-SVM) algorithm is used to identify the location of the fault. The experimental results show that this method has high accuracy in the fault diagnosis of escalator step system.

Enhancement of CO2 desorption using ultrasound and vacuum in water scrubbing biogas upgrading system

Fuqiang Jin,Haipeng Xu,Dongliang Hua,Lei Chen,Yan Li,Yuxiao Zhao,Bin Zuo 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1

Ultrasound and vacuum were respectively employed to enhance CO2 desorption in a water scrubbing biogas upgrading system. Results showed that incomplete CO2 desorption could cause a high CO2 content in the water and seriously affect the purity of the product gas. Vacuum had a strong enhancement effect on CO2 desorption. When a vacuum of 0.04MPa was used to enhance CO2 desorption, the amount of the stripping air could be reduced to 1/16- th of that without enhancement, indicating that vacuum could greatly enhance CO2 desorption and significantly decrease the amount of the stripping air, which was expected to reduce a large amount of energy consumption. In contrast, the enhancement effect of ultrasound was not so obvious for CO2 desorption in the desorption column with air stripping, since the solution could be well desorbed by gas stripping, though ultrasound could strongly affect the static CO2 desorption.

Analysis on the influence of sports equipment of fiber reinforced composite material on social sports development

Jian Li,Ningjiang Bin,Fuqiang Guo,Xiang Gao,Renguo Chen,Hongbin Yao,Chengkun Zhou Techno-Press 2023 Advances in nano research Vol.15 No.1

As composite materials are used in many applications, the modern world looks forward to significant progress. An overview of the application of composite fiber materials in sports equipment is provided in this article, focusing primarily on the advantages of these materials when applied to sports equipment, as well as an Analysis of the influence of sports equipment of fiber-reinforced composite material on social sports development. The present study investigated surface morphology and physical and mechanical properties of S-glass fiber epoxy composites containing Al₂O₃ nanofillers (for example, 1 wt%, 2 wt%, 3 wt%, 4 wt%). A mechanical stirrer and ultrasonication combined the Al₂O₃ nanofiller with the matrix in varying amounts. A compression molding method was used to produce sheet composites. A first physical observation is well done, which confirms that nanoparticles are deposited on the fiber, and adhesive bonds are formed. Al₂O₃ nanofiller crystalline structure was investigated by X-ray diffraction, and its surface morphology was examined by scanning electron microscope (SEM). In the experimental test, nanofiller content was added at a rate of 1, 2, and 3% by weight, which caused a gradual decrease in void fraction by 2.851, 2.533, and 1.724%, respectively, an increase from 2.7%. The atomic bonding mechanism shows molecular bonding between nanoparticles and fibers. At temperatures between 60 ℃ and 380 ℃, Thermogravimetric Analysis (TGA) analysis shows that NPs deposition improves the thermal properties of the fibers and causes negligible weight reduction (percentage). Thermal stability of the composites was therefore presented up to 380 ℃. The Fourier Transform Infrared Spectrometer (FTIR) spectrum confirms that nanoparticles have been deposited successfully on the fiber.

Tumor Targeting and pH-Responsive Polyelectrolyte Complex Nanoparticles Based on Hyaluronic Acid-Paclitaxel Conjugates and Chitosan for Oral Delivery of Paclitaxel

Jiao Li,Pingsheng Huang,Longlong Chang,Xingwen Long,Anjie Dong,Jinjian Liu,Liping Chu,Fuqiang Hu,Jianfeng Liu,Liandong Deng 한국고분자학회 2013 Macromolecular Research Vol.21 No.12

A new platform of paclitaxel (PTX) for application as an oral delivery system was developed, by combining the pH sensitivity of polyelectrolyte complex nanoparticles (CNPs) and the active targeting of hyaluronic acid (HA). Chitosan/hyaluronic acid-paclitaxel (CS/HA-PTX) CNPs were prepared by coating the CS onto the HA-PTX nanoparticles (NPs), and characterized by Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H NMR), transmission electron microscopy (TEM) and high-performance liquid chromatography (HPLC). HA-PTX conjugates could self-assemble into NPs in aqueous solution with an average size of 100±5 nm, and the PTX content of HA-PTX conjugates was 10.6 wt%. The CS/HA-PTX CNPs had a smaller size and higher PTX content when the ratio of positive charge to negative charge was 2:1. The in vitro release of PTX from CNPs was pH-responsive,suggesting that the CS shell could prevent the breakage of the ester bond in HA-PTX NPs in acidic pH conditions. HA-PTX NPs exhibited higher cellular uptake than free PTX against HepG2 cells via receptor-mediated endocytosis. PTX could accumulate remarkably into tumor sites after oral administration of CNPs. These results indicate that the CNP drug delivery system has great potential for applications in the oral administration of hydrophobic drugs.

polymer-permeating grain boundary method for highly efficient perovskite solar cell

이호준,( Li Fuqiang ),( Liu Fengwu ),( Li Ying ),( Zhang Anqi ),( Du Xiangrui ),( Semo Son ),( Sangwook Wu ),( Sung Heum Park ) 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.-

Influence of Internet-based Social Big Data on Personal Credit Reporting

Meng Li,Zhang Shuang,Wang Fuqiang 사단법인 미래융합기술연구학회 2020 아시아태평양융합연구교류논문지 Vol.6 No.7

With the advent of the era of big data, the connotation of Credit investigation in China has gradually shifted from traditional data to social big data. The sources of credit data are not limited to traditional data, such as credit data; It also includes data on network behavior based on Internet transactions. The scene of credit investigation also extends from the financial industry to economic and social life. Based on the traditional credit analysis model, this paper puts forward a new network behavior credit analysis model by replacing "mortgage" with "social". Through data collection, data model, data service and other links, this paper proves that big data of network behavior can cover all credit investigation elements and can be used as a data source for personal credit analysis, with very high integrity. Among them, social network big data is a very important data source and occupies a high weight. This paper adopts the information research method, collects, processes and collates the social network big data, personal credit investigation and other information, constructs the "5C" credit analysis method of network behavior, and studies the personal credit investigation of the social network big data by combining the examples of Domestic Internet giants Tencent and Ali, and adopts the tabling method and cobweb map, etc. The network behavior credit analysis model proposed in this paper makes full use of the big data of social network to promote the development of personal credit investigation business and provides meaningful and valuable Suggestions for the government and industry.

Guangxi cobra venom-derived NGF promotes the osteogenic and therapeutic effects of porous BCP ceramic

Pan Jin,Fuqiang Yin,Li Huang,Li Zheng,Jinmin Zhao,XINGDONG ZHANG 생화학분자생물학회 2017 Experimental and molecular medicine Vol.49 No.-

Neuro-osteological interactions have an important role in the regulation of bone metabolism and regeneration. Neuropeptides combined with porous biphasic calcium phosphates (BCP) using protein adsorption may contribute to the acceleration of bone formation. In the present study, we investigated the effect of BCP combined with nerve growth factor (NGF) on the growth of osteoblasts in vitro and the combinational therapeutic effect on the repair of calvarial defects in vivo. NGF was separated and purified from Chinese cobra venom using a simplified three-step chromatography method. BCP combined with NGF exerted a potent effect on osteoblast differentiation, as evidenced by enhanced cell proliferation, increased ALP activity and the upregulated expression of osteogenesis-related genes and proteins. Further, combinational therapy with BCP and NGF improved calvarial regeneration, which was superior to treatment with therapy alone, as observed using imageological and morphological examination and histological and immunohistochemical staining. The results confirmed the effect of neuro-osteological interactions through combinatorial treatment with NGF and BCP to promote osteogenesis and bone formation, which may provide an effective and economical strategy for clinical application.

Calibration Method of Roof Weld Coating Robot System Based on Plane-to-Plane Intersection Model

Shanming Luo,Fuqiang Li,Pingjiang Wang,Yin Yang,Jingyu Mo 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.8

In order to solve the problems of traditional calibration methods, such as assigning internal and external parameters for camera and hand-eye relation matrices, a new method to calibrate weld coating robots based on plane-to-plane intersection model is developed in this paper. The mathematical model of the system is established by the homogeneous transformation theory, and then used to calibrate the line structured light sensor (LSLS). By adjusting the robot, the coordinate systems of the LSLS and the workpiece are superposed to solve the hand-eye relation matrix of the car roof weld coating robot. Finally, the calibrated experimental process and results towards car roof weld coating robot system are analyzed. The results show that this method is simple and high accuracy in roof weld coating robot system, and can be applied to the field calibration of car roof weld coating robot system. Furthermore, it can provide guiding significance for calibration of other robot systems.