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Comparative Investigation Into Field Performance of Steel Bridge Deck Asphalt Overlay Systems
Xiaoyang Jia,Baoshan Huang,Shangjiang Chen,Dawei Shi 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.7
The steel bridge deck overlay provides a smooth surface for riding and protects the deck from influence of traffic and environment factors. The presence of distress on overlay may compromise the serviceability of a bridge. A better understanding of distress is indispensable for designers to make improvements on asphalt overlay to extend the service life. A field investigation into performance of two bridge deck asphalt overlay systems was conducted. The overlay system included an epoxy asphalt overlay and a composite asphalt overlay consisting of Stone-Matrix-Asphalt (SMA) and Gussasphalt (GA). The field investigation was conducted to evaluate the difference in performance between two systems. Chemical analyses were performed on core samples from each bridge to further investigate the distress mechanism of each system. Results indicated that the two overlay systems generally exhibited similar field performance. Each bridge developed different distress, mainly due to the poor bonding between layers or between overlay and steel deck.
Evaluation of energy correction algorithm for signals of PET in heavy-ion cancer therapy device
Niu, Xiaoyang,Yan, Junwei,Wang, Xiaohui,Yang, Haibo,Ke, Lingyun,Chen, Jinda,Du, Chengming,Zhang, Xiuling,Zhao, Chengxin,Kong, Jie,Su, Hong Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.1
In order to solve the contradiction between requirements of high sampling rate for acquiring accurate energy information of pulses and large amount of data to be processed timely, the method with an algorithm to correct errors caused by reducing the sampling rate is normally used in front-end read-out system, which is conductive to extract accurate energy information from digitized waveform of pulse. The functions and effects of algorithms, which mainly include polynomial fitting with different fitting times, double exponential function fitting under different sampling modes, and integral area algorithm, are analyzed and evaluated, and some meaningful results is presented in this paper. The algorithm described in the paper has been used preliminarily in a prototype system of Positron Emission Tomography (PET) for heavy-ion cancer therapy facility.
Antony Maodzeka,Qian Wang,Xiaoyang Chen,Nazim Hussain,Dezhi Wu,Lixi Jiang 한국식물학회 2019 Journal of Plant Biology Vol.62 No.3
Application of 5-Aminolevulinic acid (ALA) toplants not only affects their growth, but also influences thenutritional values of plant organs. Oilseed rape (Brassicanapus L.) is an important source of vegetable oil and variouscompounds benefiting human health. However, limitedinformation is available regarding the effect of ALA on thegrowth of this important crop. Here, we investigated theconsequence of ALA application on oilseed rape seedlings. We found that moderate ALA concentrations (0.5 or 1 mg/L)caused an increase in the dry weight of the seedling biomassand the contents of various bioactive compounds, i.e. solublesugar, phenolic compounds, ascorbate, and glucosinolatesetc, and the upregulated expressional levels of the genesencoding RuBisCO, namely, BnRBCL and BnRBCS, andother genes such as BnUGT79B1, BnMYB12 and MYB28that regulate the synthesis of phenolic compounds andglucosinolates respectively. On the other hand, high ALAconcentrations (5 and 10 mg/L) gave rise to oxidative stressthat negatively affected oilseed rape growth, and causeddeleterious effects by reducing various bioactive compounds,but increasing tocopherols that may serve as a stress mitigatoryagent. With the high ALA concentrations, the ultrastructureof chloroplasts was notably damaged, featured with largestarch grains and fewer plastoglobules.
Zhe Zhang,Ming Liu,Xiaoyang Zhou,Lu Chen 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.5
Since more elements are involved in the construction projects, the decision making process of Resource-constrained Project Scheduling Problems (RCPSP) cannot be determined by a manager, but multiple level decision makers. This study focuses on the RCPSP in a practical grounding grid system project in Jin’ An Qiao hydropower station, which consider the hierarchical organization structure and hybrid uncertainty environment simultaneously. In this practical RCPSP, the construction contractor is the Upper Level Decision Maker (ULDM), while the outsourcing partner is the Lower Level Decision Maker (LLDM). Considering the operations difficulties and practical decision making process in the RCPSP, a bi-level multi-objective RCPSP model with bi-random coefficients is developed. To deal with the bi-random variables in the model, the Dependent-Chance Programming (DCP) method is introduced and the equivalent crisp model is derived. Subsequently, motivated by the particular nature of model, Bi-level Global-local-neighbor Particle Swarm Optimization Algorithm (BGLN-PSO) is designed to obtain the optimal schedule for grounding grid system project. A practical application is presented to verify the efficiency of proposed bi-level multi-objective RCPSP model and algorithm.
A Novel Spectral Matching LED Lighting Source for Plant
Fan Cao,Ailin Chen,Zhisheng Wang,Xiaoyang He,Nianyu Zou 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.8
This paper deals with the spectral matching optimization by a group of narrowband high power LEDs to achieve the target spectrum required by plant growing, the correlation index is a key evaluation criteria, higher value of which is often difficult to achieve because of the poor performance of spectral matching algorithm. The bat algorithm is proposed as a spectral matching algorithm. Parameters of bat algorithm under high correlation index are selected by observing the parameter variation tendency in the spectral matching simulation. In the experimental verification, 2 kinds of control circuit are used to match the target spectrum. Experimental results shows that appropriate parameter groups of bat algorithm must select based on their relationship with the correlation index. In practical experiment, the optimal correlation index is 0.70±0.05 under conditions of 3 selected bat algorithm parameter groups. It is of significance to plant lighting in the engineering practice exploratory.
Qiao He,Yi Zhang,Xiaoyang Chen,Zhi Wang,Hang Ji,Mingjian Ding,Bin Xie,Ping Yu 한국물리학회 2020 Current Applied Physics Vol.20 No.4
The radio frequency magnetron sputtering technology (RFMS) was employed to deposit perovskite structure orthogonal phase CaZrO3 thin films on Pt/Ti/SiO2/Si substrates. The effects of substrate temperatures on structure and electrical properties of these films were investigated in detail. The CaZrO3 thin films were systematically characterized by means of X-ray diffraction (XRD), Scanning electron microscope (SEM), Multifrequency LCR meter (HP4294A) and Radiant Precision Workstation to study the phase structure, cross-section morphology, dielectric and ferroelectric properties at different substrate temperatures. The result indicates that these films can withstand 80 V DC Bias voltage and have excellent stability of frequency, voltage and temperature. The CaZrO3 thin film prepared at 550 °C turned out to be mainly orthorhombic CaZrO3 phase with high permittivity, low dielectric loss, extremely low leakage current (at 1 MHz, the dielectric constant is 39.42, the dielectric loss is 0.00455, the quality factor is 220 and the leakage current density is 9.11 × 10−7A/cm2 at 80 V applied voltage.). This work demonstrates that higher substrate temperature can boost the formation of orthorhombic CaZrO3 phase and the CaZrO3 thin film prepared by RF magnetron sputtering is a very promising paraelectric material in the application of thin film capacitor.
Static analysis of thin-walled flexible components in a harmonic reducer
Yazhen Wang,Yang Yu,Wuqiang Jiang,Xiaoyang Chen 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
A harmonic reducer is a speed-changing device with thin-walled flexible components. Under the action of a cam wave generator, the flexible components generate controllable elastic deformation to actualize the transfer of motion and power. As two core thin-walled flexible components of the harmonic reducer, the outer ring of flexible bearing (FB) and flexspline (FS) will generate small and continuous deflection waves with the rotation of the wave generator. In this paper, an energy method mechanical model for the FS and the FB in the assembled state is established by theoretical analysis. The internal load distribution of the FB is obtained by solving this model, and the deformation of two flexible components is considered. The effect of the structural parameters of the FS on the load distribution and the strain energy is investigated. The conclusions provide guidance for the structural optimization design of a harmonic drive.