Correcting the Elastic-modulus Error of Quartz Glass Using Digital Speckle-pattern Interferometry

Ziyang Song,Weixian Li,Sijin Wu,Lianxiang Yang 한국광학회 2023 Current Optics and Photonics Vol.7 No.4

Three-point bending is the main method for measuring the elastic modulus of a thin plate. Although various displacement transducers may be used to measure the bending, these are single-point measurements, and it is difficult to eliminate the error caused by eccentric load and shear force. Error-correction models for the elastic modulus of quartz glass using digital speckle interferometry are proposed for eccentric load and shear force. First, the positional misalignment between maximum deflection and load is analyzed, and the error caused by eccentric load is corrected. Then, the additional displacement caused by shear force at different positions of the quartz glass plate is explored. The effect of shear deformation is also corrected, by measuring two points. Since digital speckle interferometry has the advantage of full-field measurement, it can simultaneously obtain deflection data for multiple points to realize error correction. Experimental results are presented to demonstrate that the proposed model can effectively correct the measurement error of the elastic modulus.

Deep Learning: High-quality Imaging through Multicore Fiber

Liqing Wu,Jun Zhao,Minghai Zhang,Yanzhu Zhang,Xiaoyan Wang,Ziyang Chen,Jixiong Pu 한국광학회 2020 Current Optics and Photonics Vol.4 No.4

Imaging through multicore fiber (MCF) is of great significance in the biomedical domain. Although several techniques have been developed to image an object from a signal passing through MCF, these methods are strongly dependent on the surroundings, such as vibration and the temperature fluctuation of the fiber’s environment. In this paper, we apply a new, strong technique called deep learning to reconstruct the phase image through a MCF in which each core is multimode. To evaluate the network, we employ the binary cross-entropy as the loss function of a convolutional neural network (CNN) with improved U-net structure. The high-quality reconstruction of input objects upon spatial light modulation (SLM) can be realized from the speckle patterns of intensity that contain the information about the objects. Moreover, we study the effect of MCF length on image recovery. It is shown that the shorter the fiber, the better the imaging quality. Based on our findings, MCF may have applications in fields such as endoscopic imaging and optical communication.

The Influence of Service Quality of E-Commerce on Consumer Satisfaction Degree and Repurchase Intention : The Case of Leisure Food E-Commerce in China

Lanmeng Wu,Dandan Yu,Ziyang Liu 한국무역통상학회 2020 무역통상학회지 Vol.20 No.6

In recent years, the proportion of leisure food in E-commerce platforms has kept increasing year by year for its attribute characteristics and the rapid development of E-commerce platforms, but some problems have also emerged. This paper aims at studying the influence of service quality on customer satisfaction and repurchase intention by means of specific division of service quality of E-commerce with leisure food E-commerce being an example. In this paper, the collected data is analyzed in terms of reliability and validity, factor analysis and construction of equation models in the form of questionnaires with software SPSS and AMOS. The conclusions obtained from analysis include: 1. Customers’ expectation before purchasing has a significant positive impact on consumer satisfaction. 2. The assumption that E-commerce web design has a significant positive impact on consumer satisfaction is false. 3. E-commerce logistics has a significant positive impact on consumer satisfaction. 4. The quality of e-commerce products has a significant positive impact on consumers. 5. E-commerce after-sales service has a significant positive impact on consumer satisfaction. 6. Consumer satisfaction has a significant positive impact on repurchase intention.

EFFECT OF INTAKE PARAMETERS COUPLED WITH PILOT DIESEL INJECTION TIMING ON COMBUSTION AND EMISSIONS OF NATURAL GAS ENGINES

Dai Ziyang,Du Weikang,Li Jie,Luo Yinmi,Jia Zhi,Wu Binyang 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.4

The collaborative control of intake parameters coupled with pilot injection timing (PIT) can extend the working load range of pilot diesel injection (PDI) ignition natural gas engines with high efficiency and clean combustion. The author conducted the test under heavy load conditions where the engine speed was 1000 r/min and the indicated mean effective pressure was 1.7 MPa. Based on the experimental results of combustion and emission characteristics, the simulation results of the generation and consumption process of active groups as well as the chemical reaction kinetics analysis, the results indicate that increasing the intake pressure (pin) can improve the overall activity of the mixture in the cylinder, resulting in higher ITEg and lower emissions; the application of exhaust gas recirculation (EGR) can inhibit the oxidation reaction of fuel and knock occurrence. High pin, suitable EGR rate, and advanced PIT can achieve high thermal efficiency and low total hydrocarbon and carbon monoxide emissions. For example, when pin was 0.34 MPa, the EGR rate was 40%, the PIT was –4°CA ATDC, and the ITEg can reach 50.46%. Simultaneously, the total hydrocarbon emission was 3.99 g/kWh, the carbon monoxide emission was 2.75 g/kWh, and the nitrogen oxides emission was 0.42 g/kWh.

The Approaches of Positive Experience Design on IoT Intelligent Products

( Chunmao Wu ),( Huayuan Xu ),( Ziyang Liu ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.5

This paper proposes a positive experience design approach for Internet of Things (IoT) intelligent products to improve users’ subjective well-being in the fields of artificial intelligence and big data. First, the authors selected six target users and taking the Xiaomi IoT intelligent products for the research objects and conducted a thorough observation on how the target users used IoT intelligent products in their own homes over two weeks via a home-visiting interview, group diary, and focus group. Second, they constructed an individual activities table for the participants' IoT intelligent product experience using a hierarchical task analysis (HTA). Third, two researchers sorted out the sub-tasks of happiness in the HTA table. Finally, the authors found the positive experience design approach of IoT intelligent products. The positive experience design approach of IoT intelligent products is proposed from focusing on the personal pleasure experience to individual life meaningful design and group social relationship design, including individual pleasure experience, personal goal realization, group needs satisfaction and the harmony of group relations. The paper uses the two design examples of an interactive kettle and a harmonious chair to further discuss the feasibility of the design approach. In the era of big data, it is helpful for designers to use this design approach to improve the users' sense of sustainable pleasure, achievement perception of their future goal realization, and the well-being of the group’s social relationships.

Facile Synthesis of Ag/AgCl Grafted AgBi(MoO4)2 with Enhanced Photocatalytic Performance Under Visible Light

Xu Yan,Ziyang Wu,Yong Zhao,Biao Liu,Yong Zhao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.08

Silver nanoparticles (NPs) and related semiconductors are a family of very important and widely applied photocatalysts. However, the preparation of high stability and activity of this photocatalyst is still a challenge. In this work, we report a stable Ag/AgCl/AgBi(MoO4)2 heterojunction photocatalyst fabricated via a simple in situ anion-exchange reaction followed by the photoreduction treatment. In the treatment of tetracycline (TC) wastewater under visible light, the AC-0.4 sample (prepared with 0.4 mmol KCl) exhibits the significantly improved activity (degradation ratio, DR of 71.3%) compared with the pristine AgBi(MoO4)2 (30% DR) and Ag/AgCl sample (synthesized by the photoreduction of AgCl) (37% DR) under identical experimental conditions. This activity promotion is from the fast interfacial electron transfer between the heterojunction phases of AgCl/AgBi(MoO4)2 and the SPR effect of Ag NPs. After five successive recycles, the AC-0.4 sample still maintains good stability and activity for TC degradation, which shows a great potential to be used in practical application. Through the ESR and controlled scavenged experiments, we found the · OH and · O- 2 are the major reactive intermediate species in the TC photodegradation reaction. Our work provides a new insight into the synthesis of stable and high efficient Ag-based heterojunction photocatalysts for the application of wastewater treatment.

Influence of Sleeve Material and Sleeve Composite Structure on Performance of High-Speed Permanent Magnet Starter-Generator for Micro-Gas Turbine

Qiu Hongbo,Liu Ziyang,Xiong Bin,Zhao Qiang,Dong Yu,Wu Xuandong 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4

When the high-speed permanent magnet starter-generator (PMSG) is operating, the permanent magnets will be aff ected by high centrifugal forces. It is necessary to add a sleeve to protect the rotor and interference fi t with the permanent magnet. However, the performance of the high-speed PMSG will be signifi cantly infl uenced by the electromagnetic characteristics of the sleeve material. In this paper, a high-speed permanent magnet starter-generator for the micro-gas turbine is used as an example, and the two-dimensional fi nite element model is established. The correctness of the model is verifi ed by comparing the experimental data with the calculated data. Taking 10,000 r/min as the ignition speed, the diff erences of motor starting performances when using diff erent sleeve materials are compared. Secondly, decoupling the complex coupling torque in the starting process, the infl uence of material electromagnetic characteristics on the asynchronous torque and braking torque is determined, and the infl uence mechanism of material electromagnetic characteristics on the torque characteristics of highspeed PMSG is revealed. In addition, the eff ects of the sleeve materials on the output performance and loss of the high-speed PMSG are determined, and infl uence mechanism is revealed. On the basis, a sleeve multiplexing scheme is proposed to improve the starting performance while reducing the eddy current losses in the generating state. The results of the study provide reference and theoretical value for the optimization of high-speed permanent magnet starter-generator.

Influence of Magnetic Slot Wedge on Parameter and Loss Distribution of High Voltage Induction Motor

Qiu Hongbo,Wang Kun,Liu Ziyang,Xiong Bin,Wu Xuandong 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6

Owing to the stator open slot structure of the high-voltage motor, the magnetic field distribution in the motor will be uneven, and the performance of the motor will deteriorate. When the slots are embedded with magnetic material slot wedges, the magnetic field of the motor will be changed. In this article, taking a 10 kV/1000 kW high-voltage induction motor (HVIM) as the prototype, the two-dimensional finite element models are established, the eff ect of magnetic slot wedge (MSW) on HVIM was analyzed. First, by establishing the air-gap permeance function, the infl uence of magnetic slot wedge on the air gap magnetic field is analyzed, the influence mechanism of magnetic slot wedge on tooth harmonic magnetic field is revealed. In addition, the effect of magnetic slot wedge on excitation inductance, slot leakage resistance, and winding inductance of HVIM is analyzed in detail, the variation of parameters with different relative permeability of slot wedge is summarized, the changes in the motor starting performance had further discussed. Finally, the influence of the slot wedge permeability on motor losses is studied, the distribution of core loss is obtained by establishing the motor segmenting model, and the various mechanisms of core losses in different regions are revealed. The findings provide the guidelines and theoretical basis for the rational selection of magnetic slot wedges.