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Influence of Test Method and Poisson's Ratio Effect on Pullout Performance of Anchor Bolt in Pile
Qing Fang,Zhijun Yang,Chuanyi Zhang,Liming Yi,Xudong Fu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.12
The influence of load pattern and Poisson’s ratio effect on the pullout performance of the anchor bolt, which were connected with pipe pile by core concrete, were investigated by three anchorage-beam pullout tests and one self-balanced pullout test. Theoretical and finite element analysis were also employed to explore the influence of load pattern and Poisson’s ratio effect on the ultimate friction at the pipe-core-concrete contact surface. The results show that the load pattern and Poisson’s ratio effect of pipe pile have a great influence on the pullout characteristics of the anchor bolt. The maximum relative displacements between core concrete and pipe pile and between anchor bolt and core concrete in self-balanced pullout test are 0.913 mm and 0.935 mm, respectively, which are significantly greater than that in anchorage-beam pullout test where the displacements are 0.292 mm and 0.500 mm, respectively. In the self-balanced test, the pipe pile is under compression and expands radially due to the Poisson’s ratio effect. In the anchorage-beam test, on the contrary, the pipe pile is under tension and shrinks radially. As a consequence, the ultimate friction between core concrete and pipe pile in the anchorage-beam test is higher than that in the self-balanced test by 15.1% to 28.7%. Accordingly, the results of anchorage-beam pullout test are more sensible for the anchor bolt design.
A Slot Allocated Blocking Anti-Collision Algorithm for RFID Tag Identification
( Yang Qing ),( Li Jiancheng ),( Wang Hongyi ),( Zeng Xianghua ),( Zheng Liming ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.6
In many Radio Frequency Identification (RFID) applications, the reader recognizes the tags within its scope repeatedly. For these applications, some algorithms such as the adaptive query splitting algorithm (AQS) and the novel semi-blocking AQS (SBA) were proposed. In these algorithms, a staying tag retransmits its ID to the reader to be identified, even though the ID of the tag is stored in the reader`s memory. When the length of tag ID is long, the reader consumes a long time to identify the staying tags. To overcome this deficiency, we propose a slot allocated blocking anti-collision algorithm (SABA). In SABA, the reader assigns a unique slot to each tag in its range by using a slot allocation mechanism. Based on the allocated slot, each staying tag only replies a short data to the reader in the identification process. As a result, the amount of data transmitted by the staying tags is reduced greatly and the identification rate of the reader is improved effectively. The identification rate and the data amount transmitted by tags of SABA are analyzed theoretically and verified by various simulations. The simulation and analysis results show that the performance of SABA is superior to the existing algorithms significantly.
Li Li,Huan Liu,Boya Li,Yanan Guo,Liming Qing,Baohui Wang 한국고분자학회 2020 Macromolecular Research Vol.28 No.5
The polyaniline/reduced graphene oxide (PANI/RGO) modified interdigital electrode (IDE) has been successfully fabricated by in situ electrochemical reduction and electrochemical polymerization through cyclic voltammetry. The morphology and topography of PANI/RGO characterized by SEM and AFM display intercrosslinked dendritic structure in three dimensions, and it is favorable for the detection of nitrite due to its large surface area, which can provide the large electrocatalytic active surface and various diffusion paths for nitrite. Herein, the obtained PANI/ RGO/IDE was employed for the electrochemical monitoring platform of nitrite for the first time and the electrochemical performance of the as-developed sensor was investigated via cyclic voltammetry and chronoamperometry. At the optimum conditions, the PANI/RGO/IDE has a linear response in the range from 0.4 to 183.7 mM with a sensitivity of 457.4 μA mM-1 cm-2 and a detection limit of 0.1 μM. Moreover, the obtained PANI/RGO/IDE with excellent long-term stability and reproducibility also can be employed for practical application for the determination of nitrite in tap water, the results show that the recovery rate is desirable. It is expected that IDE can be employed as the substrate electrode decorated with various materials to construct highperformance electrochemical sensors.