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Using Input Shaping to Repress Two-mode Residual Vibration on Aerial Lifts
Jia Hongxia,Zhu Fumin,Joshua Vaughan 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Aerial lifts are machines that enable human workers to comfortably work at heights that might otherwise be inaccessible. They typically have multiple long-reach arms to enable working at such heights. There is typically enough flexibility in these arms to result in deflections of the lift endpoint, the bucket where the operators are located. These deflections can be excited by either motion of the operators within the bucket or by operator commands moving the bucket around the workspace. Input shaping is one method that can drastically reduce the motion-induced oscillation. This paper investigates the application of input shaping to one category of aerial lifts, commonly called cherrypickers. When input shaping is used, the endpoint vibration is reduced. However, it is not completely eliminated due to the nonlinear nature of the system.
FUNCTIONALIZED MULTIWALLED CARBON NANOTUBES BY GRAFTING HYPERBRANCHED POLYSILOXANE
HONGXIA YAN,YUAN JIA,LEI MA,YANLI WANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.3
Multi-walled carbon nanotubes (MWCNTs) are grafted with hyperbranched polysiloxane(HBPSi) by an e±cient hydrosilylation method. In this hydrosilylation process, hydroxylatedMWCNTs (HO-MWCNTs) are ¯rst functionalized by triethoxyvinylsilane to introduce carbon –carbon double bonds (C ¼ C) on the surface of MWCNTs. The C ¼ C is then reacted with themonomer of methylbis(dimethylvinylsiloxy)silane in the presence of the platinum – carbon cata-lyst, thus HBPSi is ultimately grafted on the surface of MWCNTs. Fourier transform infraredspectrometry (FTIR), Transmission electron microscope (TEM) and X-ray photoelectron spec-troscopy (XPS) are employed to characterize the changes in MWCNTs surface morphology,chemistry and physical conditions at di®erent processing stages. The content of HBPSi on thesurface of MWCNTs was also measured by the thermogravimetric analysis (TGA). The resultsindicate that the HBPSi successfully grafted on the surface of MWCNTs, and the dispersion ofMWCNTs in organic solvent is also improved after functionalization.
YUAN JIA,HONGXIA YAN,Song Li,Tianye Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.6
To reveal the wear mechanism of hyperbranched polysilane (HBPSi) grafted multi-walled carbon nanotubes (HBPSi–MWCNTs) modified benzoxazine–bismaleimide (BOZ–BMI) resin (HBPSi– MWCNTs/BOZ–BMI), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA) were employed. The results indicated that the suitable addition of HBPSi–MWCNTs could largely enhance the tribological properties of BOZ– BMI composites. The worn surface of the composites showed that the severe wear of the BOZ– BMI resin was converted from adhesive wear to abrasive wear with the addition of HBPSi– MWCNTs. The excellent tribological properties can be attributed to the improved interfacial adhesion between HBPSi–MWCNTs and the BOZ–BMI resin matrix. The TGA demonstrated that the composite with 0.8 wt.% HBPSi–MWCNTs exhibits better thermal resistance; thus, it can inhibit adhesive wear during the friction process. The XPS spectra and the surface energy showed that the HBPSi–MWCNTs could be exposed on the worn surface of the composite to improve the anti-wear capacity of the composites further.
Ailing Feng,Zirui Jia,Qiang Yu,Hongxia Zhang,Guanglei Wu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.4
The properties of fiber-matrix interface pay an important effect on the mechanical properties of carbon fiber-reinforced composites. To improve the interfacial properties in carbon fiber/phenolic resin (CF/PF) composites, CF adhered CNTs (CNTs-CF) were prepared by CVD method. The surface of treated CF and the distribution of CNTs in the interfacial region of CF were detected by scanning electron microscopy (SEM). SEM images identified 700 ℃ being the optimum growth temperature to obtain CNTs-CF, in which CNTs randomly dispersed surrounding the individual fiber surfaces. Compared to crude CF/PF composites, the tensile strength, bending strength, shear strength, impact strength, thermal conductivity at 25 C of CNTs-CF/PF composites increase by 144.5%, 59.2%, 129.0%, 75.9% and 41.7%. The improvement of mechanical properties is due to that the homogenously dispersed CNTs serve as a supplementary reinforcement to the interface and further reduce inter-laminar stress concentration. This represents an important step toward CNT-reinforced polymers with high mechanical properties.
Kaiyun Qin,Fenghua Zhang,Hongxia Wang,Na Wang,Hongbing Qiu,Xinzhuan Jia,Shan Gong,Zhengmao Zhang 생화학분자생물학회 2023 BMB Reports Vol.56 No.3
Ovarian cancer (OC) is the most common gynecological malignancyworldwide, and chemoresistance occurs in most patients,resulting in treatment failure. A better understanding of themolecular processes underlying drug resistance is crucial fordevelopment of efficient therapies to improve OC patient outcomes. Circular RNAs (circRNAs) and ferroptosis play crucialroles in tumorigenesis and resistance to chemotherapy. However,little is known about the role(s) of circRNAs in regulatingferroptosis in OC. To gain insights into cisplatin resistance inOC, we studied the ferroptosis-associated circRNA circSnx12. We evaluated circSnx12 expression in OC cell lines and tissuesthat were susceptible or resistant to cisplatin using quantitativereal-time PCR. We also conducted in vitro and in vivoassays examining the function and mechanism of lnc-LBCSs. Knockdown of circSnx12 rendered cisplatin-resistant OC cellsmore sensitive to cisplatin in vitro and in vivo by activatingferroptosis, which was at least partially abolished by downregulationof miR-194-5p. Molecular mechanics studies indicatethat circSnx12 can be a molecular sponge of miR-194-5p, whichtargets SLC7A11. According to our findings, circSnx12 amelioratescisplatin resistance by blocking ferroptosis via a miR-194-5p/SLC7A11 pathway. CircARNT2 may thus serve as an effectivetherapeutic target for overcoming cisplatin resistance in OC.