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Application of Waste Plastic Disposals to Marine Diesel Engines
Wei haijun,Guan delin,Wang hongzhi 한국항해항만학회 2000 한국항해항만학회 학술대회논문집 Vol.5 No.2
This paper illustrates a new test and result of WPD oil applied to marine diesel engines. In recent years, we must make an effort to develop an advanced technique for recycling waste plastics in order to utilize scrapped plastics as fuel for diesel engine. It is very important and necessary for us to cope with the increasing calorific value and the growing need of environment protection. The experiment fuel oil was obtained by mixing of diesel oil, WPD and water.
Efficiency Analysis of Homodyne Detection for a Coherent Lidar with Adaptive Optics
Wei Liu,Liang Wang,Kainan Yao,Jingtai Cao,Danian Huang,Haijun Gu 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.12
For a coherent lidar, the efficiency of homodyne detection is a significant factor. Adaptive optics (AO) is an effective way to correct the turbulence-induced wavefront distortions. Based on our previous works, an expression for the homodyne detection efficiency is given. The results of the numerical simulation show that the atmospheric coherent length has an influence on the homodyne detection efficiency for a fixed atmospheric Greenwood frequency and a closed-loop control bandwidth. In addition, an experimental AO system is employed to verify the effect of the AO on the coherent lidar. The results show that the homodyne detection efficiency is obviously improved after aberrations are corrected. The conclusion of this paper provides a reference for designing an AO system for a coherent lidar.
Wei Liu,Kainan Yao,Danian Huang,Jingtai Cao,Liang Wang,Haijun Gu 한국광학회 2017 Current Optics and Photonics Vol.1 No.1
Degradation of bit-error-rate (BER), caused by atmospheric turbulence, seriously hinders the performanceof coherent Free Space Optical (FSO) communication systems. An adaptive optics system proves to beeffective in suppressing the atmospheric turbulence. The holographic modal wavefront sensor (HMWFS)proposed in our previous work, noted for its fast detecting rates and insensitivity to beam scintillation,is applied to the coherent FSO communication systems. In this paper, based on our previous work, wefirst introduce the principle of the HMWFS in brief and give the BER of the coherent FSO with homodynedetection in theory, and then analyze the improvement of BER for a coherent FSO system based on ourprevious simulation works. The results show that the wavefront sensor we propose is better for weakatmospheric turbulence. The most obvious advantages of HMWFS are fast detecting rates and insensitivityto beam scintillation.
Decision-making Study on Mechanism and Priority of Functional Objective of the Manufacturing System
Wei Xu,Qingshan Zhang,Yue Cao,Haijun Wang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.8
The aim of this paper established priority level determines method of manufacturing system functional objective based QFD theory, priority sequence presented and the functional objective priority weights, advised manufacturing system functional objective decisions, provides technology support and application reference for system functional objective decisions.
Wei Li,Haijun Shen 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.2
We present a finite element model of laminated composite cylindrical shells with piezoelectric layers by using layerwise theory. The formulation, which is based on Reddy’s layerwise displacement theory, involves the coupling between mechanical deformations and electric displacements. The full layerwise theory is used to represent the total displacement field and electric potential, and then a finite element model has been formulated based on the developed mechanics by employing Hamilton’s principle and variational method. This layerwise finite element model can give an accurate description of displacement field at the ply level and can model complex boundary conditions. Numerical example of a simply-supported laminated piezoelectric composite shell for static response and free vibration analysis was implemented to evaluate the efficiency and accuracy of the present method. Numerical results obtained with the present method are in excellent agreement with other similar solutions.
Liu, Wei,Yao, Kainan,Huang, Danian,Cao, Jingtai,Wang, Liang,Gu, Haijun Optical Society of Korea 2017 Current Optics and Photonics Vol.1 No.1
Degradation of bit-error-rate (BER), caused by atmospheric turbulence, seriously hinders the performance of coherent Free Space Optical (FSO) communication systems. An adaptive optics system proves to be effective in suppressing the atmospheric turbulence. The holographic modal wavefront sensor (HMWFS) proposed in our previous work, noted for its fast detecting rates and insensitivity to beam scintillation, is applied to the coherent FSO communication systems. In this paper, based on our previous work, we first introduce the principle of the HMWFS in brief and give the BER of the coherent FSO with homodyne detection in theory, and then analyze the improvement of BER for a coherent FSO system based on our previous simulation works. The results show that the wavefront sensor we propose is better for weak atmospheric turbulence. The most obvious advantages of HMWFS are fast detecting rates and insensitivity to beam scintillation.
魏海军,(Wei haijun),关,德林(Guan delin),王宏志(Wang hongzhi) 한국항해항만학회 2000 한국항해항만학회 학술대회논문집 Vol.5 No.2
This paper illustrates a new test and result of WPD oil applied to marine diesel engines. In recent years, we must make an effort to develop an advanced technique for recycling waste plastics in order to utilize scrapped plastics as fuel for diesel engine. It is very important and necessary for us to cope with the increasing calorific value and the growing need of environment protection. The experiment fuel oil was obtained by mixing of diesel oil, WPD and water.
Jingtai Cao,Xiaohui Zhao,Wei Liu,Haijun Gu 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.5
A wavefront sensor is one of most important units for an adaptive optics system. Based on our previous works, in this paper, we discuss the bit-error-rate (BER) performance of coherent free space optical communication systems with a focal-plane-based wavefront sensor. Firstly, the theory of a focal-plane-based wavefront sensor is given. Then the relationship between the BER and the mixing eciency with a homodyne receiver is discussed on the basis of binary-phase-shift-keying (BPSK) modulation. Finally, the numerical simulation results are shown that the BER will be decreased obviously after aberrations correction with the focal-plane-based wavefront sensor. In addition, the BER will decrease along with increasing number of photons received within a single bit. These analysis results will provide a reference for the design of the coherent Free space optical communication (FSOC) system.
Circ_0068655 Promotes Cardiomyocyte Apoptosis via miR-498/PAWR Axis
Chai Qiaoying,Zheng Mingqi,Wang Le,Wei Mei,Yin Yajuan,Ma Fangfang,Li Xinping,Zhang Haijun,Liu Gang 한국조직공학과 재생의학회 2020 조직공학과 재생의학 Vol.17 No.5
Background: The cardiomyocyte apoptosis is considered as one of major contributions to cardiac remodeling after myocardial infarction (MI). Numerous studies find that circular RNAs (circRNAs) play pivotal roles in a variety of biological functions. However, the role of circ_0068655 in MI and human induced pluripotent stem-derived cardiomyocytes (HCMs) remains unknown. Methods: The expression of circ_0068655, miR-498, and PRKC apoptosis WT1 regulator (PAWR) in human MI heart tissues and hypoxia subjected HCMs was evaluated with qRT-PCR and Western blot. The effects of circ_0068655 on hypoxia-induced apoptotic death and cell migration in HCMs were evaluated with qRT-PCR, cell viability, cell death ELISA (POD), and Caspase-3 activity assay, and Trans-well assay, respectively. Furthermore, luciferase assay, qRT-PCR, biotin-labeled miRNA pulldown assay, and Western blot were employed in the functional studies. Results: We found that the expression of circ_0068655 and PAWR was enhanced in MI patients and hypoxia subjected HCMs; by contrast, the expression of miR-498 decreased. Inhibited expression of circ_0068655 in HMCs counteracted hypoxia-induced apoptotic death and impaired cell migration, in sharp contrast to circ_0068655 knockdown. We identified that circ_0068655 sponged an endogenous miR-498 to sequester and inhibit its activity, leading to the increased PAWR expression. Conclusions: Our findings reveal that the expression of circ_0068655 can promote cardiomyocyte apoptosis through the modulation of miR-498-PAWR axis in vitro, which highlights the diagnostic and therapeutic value of circ_0068655 in patients with MI.
Jingtai Cao,Xiaohui Zhao,Zhaokun Li,Wei Liu,Haijun Gu 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.10
The performance of free space optical (FSO) communication system is limited by atmospheric turbulent extremely. Adaptive optics (AO) is the significant method to overcome the atmosphere disturbance. Especially, for the strong scintillation effect, the sensor-less AO system plays a major role for compensation. In this paper, a modified artificial fish school (MAFS) algorithm is proposed to compensate the aberrations in the sensor-less AO system. Both the static and dynamic aberrations compensations are analyzed and the performance of FSO communication before and after aberrations compensations is compared. In addition, MAFS algorithm is compared with artificial fish school (AFS) algorithm, stochastic parallel gradient descent (SPGD) algorithm and simulated annealing (SA) algorithm. It is shown that the MAFS algorithm has a higher convergence speed than SPGD algorithm and SA algorithm, and reaches the better convergence value than AFS algorithm, SPGD algorithm and SA algorithm. The sensor-less AO system with MAFS algorithm effectively increases the coupling efficiency at the receiving terminal with fewer numbers of iterations. In conclusion, the MAFS algorithm has great significance for sensor-less AO system to compensate atmospheric turbulence in FSO communication system.