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Deep Drawing of Cylindrical Cups Using Polymer Powder Medium Based Flexible Forming
Can-Bin Zhang,Feng Gong 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.1
A novel flexible forming process—polymer powder medium based flexible forming (PPFF)—was presented in this research. Cylindrical cups with inner diameter of 8 mm were formed using rigid mould deep drawing and PPFF process, respectively. The blank material was pure copper C1100 with a thickness of 0.4 mm which was annealed at 450oC for 1 h in vacuum condition. The deep drawing experiments were carried out at room temperature under dry friction condition. Ethylene-vinyl acetate copolymer (EVA), poly vinyl chloride (PVC) and ultra-high molecular weight polyethylene (UHWPE) were used. The influence of polymer powder type and weight on deep drawing force and limiting drawing ratio (LDR) were investigated. The results showed that the cylindrical cups were well formed by using PVC. The LDR reached 2.1 by using PVC, higher than rigid mould. The surface quality was also good, with the thinning rate much smaller than rigid mould forming.
Zhang, Benjiao,Mei, Can,Huang, Bin,Fu, Xudong,Luo, Gang,Lv, Bu Techno-Press 2017 Geomechanics & engineering Vol.12 No.4
The research reported herein is concerned with the model testing of piles socketed in soft rock which was simulated by cement, plaster, sand, water and concrete hardening accelerator. Model tests on a single pile socketed in simulated soft rock under axial cyclic loading were conducted and the bearing capacity and accumulated deformation characteristics under different static, and cyclic loads were studied by using a device which combined oneself-designed test apparatus with a dynamic triaxial system. The accumulated deformation of the pile head, and the axial force, were measured by LVDT and strain gauges, respectively. Test results show that the static load ratio (SLR), cyclic load ratio (CLR), and the number of cycles affect the accumulated deformation, cyclic secant modulus of pile head, and ultimate bearing capacity. The accumulated deformation increases with increasing numbers of cycles, however, its rate of growth decreases and is asymptotic to zero. The cyclic secant modulus of pile head increases and then decreases with the growth in the number of cycles, and finally remains stable after 50 cycles. The ultimate bearing capacity of the pile is increased by about 30% because of the cyclic loading thereon, and the axial force is changed due to the applied cyclic shear stress. According to the test results, the development of accumulated settlement is analysed. Finally, an empirical formula for accumulated settlement, considering the effects of the number of cycles, the static load ratio, the cyclic load ratio and the uniaxial compressive strength, is proposed which can be used for feasibility studies or preliminary design of pile foundations on soft rock subjected to cyclic loading.
The Effect of h-BN Buffer Layers in Bilayer Graphene on Co (111)
Can Li,Yan Liu,Bin Zhang,Tao Wang,Qing Guo,Kuang Sheng,You Yin 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.10
Understanding of the interface of Co/graphene is essential for applications of graphene-based devices, as well as in the process of graphene synthesis. In this paper, the Co/graphene interface, including five structures of bilayer graphene (BLG) on Co (111) surface with bilayer or monolayer BN buffer sheets, is investigated by using density functional theory calculations. The corresponding atomic and electronic structures and Mulliken charge populations are also analyzed. The bilayer BN sheets are found to be the thinnest insulator for the backside Co metal gate, which shields BLG from Co substrate pining, decreases the charges influenced by the substrate, and improves BLG transport mobility.
Lentivirus Mediated GOLPH3 shRNA Inhibits Growth and Metastasis of Esophageal Squamous Cancer
Wang, Qiang,Wang, Xian,Zhang, Can-Bin Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.9
Aim: To investigate the role of Golgi phosphoprotein 3 (GOLPH3) in tumour growth and metastasis of esophageal squamous cancer. Methods: A lentiviral shRNA-vector was utilized to stably knockdown GOLPH3 in Eca-109 esophageal squamous cancer cells. mRNA transcription and protein expression of GOLPH3 were examined by real-time quantitative PCR and Western blotting, respectively. Cell proliferation activity was assessed by MTT assay and invasion and migration potentials by matrigel invasion and transwell motility assays. Results: Stable knockdown in the GOLPH3 cell line was established. PD-A gene expression was significantly suppressed by lentivirus-mediated RNAi, which resulted in reducing the capacity for cell proliferation, migration, invasion and adhesion in vitro. In vivo, GOLPH3 depletion resulted in inhibition of tumour growth, with stable decrease in the expression of GOLPH3 in tumor xenografts. Conclusions: Our findings suggest that lentivirus mediated silencing of the GOLPH3 gene has a significant anti-tumour effect on esophageal squamous cancer in vitro and in vivo. In addition, the results indicate that GOLPH3 might be an effective molecular target for gene therapy in esophageal squamous cancer.
Tunable Bandgap of Monolayer Black Phosphorus by Using Vertical Electric Field: a DFT Study
Tao Wang,Yan Liu,Qing Guo,Bin Zhang,Kuang Sheng,Can Li,You Yin 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.6
Using a ab initio plane-wave ultrasoft pseudopotential method based on the generalized gradientapproximation (GGA), we investigate the bandgap tuning in monolayer black phosphorus byapplying external electric fields perpendicular to the layers. The bandgap continuously decreaseswith increasing applied electric fields, eventually rendering them metallic. We use the giant Starkeffect, which is essentially characterized by an interlayer spacing to explain the rate of change ofthe bandgap with the applied external field. The atomic distance and charges also contribute to thesemiconductor-to-metal transition. Our investigations show the bandgap change for the fabricationof novel electronic and photonic devices.
Quantum Dots Formed in Three-dimensional Dirac Semimetal Cd<sub>3</sub>As<sub>2</sub> Nanowires
Jung, Minkyung,Yoshida, Kenji,Park, Kidong,Zhang, Xiao-Xiao,Yesilyurt, Can,Siu, Zhuo Bin,Jalil, Mansoor B. A.,Park, Jinwan,Park, Jeunghee,Nagaosa, Naoto,Seo, Jungpil,Hirakawa, Kazuhiko American Chemical Society 2018 NANO LETTERS Vol.18 No.3
<P>We demonstrate quantum dot (QD) formation in three-dimensional Dirac semimetal Cd<SUB>3</SUB>As<SUB>2</SUB> nanowires using two electrostatically tuned p-n junctions with a gate and magnetic fields. The linear conductance measured as a function of gate voltage under high magnetic fields is strongly suppressed at the Dirac point close to zero conductance, showing strong conductance oscillations. Remarkably, in this regime, the Cd<SUB>3</SUB>As<SUB>2</SUB> nanowire device exhibits Coulomb diamond features, indicating that a clean single QD forms in the Dirac semimetal nanowire. Our results show that a p-type QD can be formed between two n-type leads underneath metal contacts in the nanowire by applying gate voltages under strong magnetic fields. Analysis of the quantum confinement in the gapless band structure confirms that p-n junctions formed between the p-type QD and two neighboring n-type leads under high magnetic fields behave as resistive tunnel barriers due to cyclotron motion, resulting in the suppression of Klein tunneling. The p-type QD with magnetic field-induced confinement shows a single hole filling. Our results will open up a route to quantum devices such as QDs or quantum point contacts based on Dirac and Weyl semimetals.</P> [FIG OMISSION]</BR>