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Effective replacement carburetor by compact Port Fuel Injection system in small motorcycle engine
Le Duc Chien,C. Purushothama,Chen Xinhong,Sim Ju Hyuen,Woohyung Kim,Chae Jae Ou 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Port Fuel Injection (PFI) was developed in 80s for automotive industry in order to improve engine performance and control effectively emission. It is now used widely in modem cars and some kinds of sport motorcycle. To take advantage of electronic, the premix of air-fuel and combustion process can be programmed and controlled very precisely. Therefore, emission and performance of engine can be improved significantly regarding to different working conditions. One of the main reason of PFI technology that makes it not popular on motorcycle is its complexity and high cost. This paper reports our recent efforts to develop a new and compact PFI system that can replace the in-used carburetor easily with less extra modification. The mixing process, included fuel injection timing, throttle shape design and parameters of ignition were all investigated. We minimized the number of sensors, built a new function to determine the crankshaft position therefore avoid to modify flywheel as previous experiments.
Power Flow Management in Hybrid Electric Vehicles
C. Purushothama,Xinhong Chen,Le Duc Chien,Jae Ou Chae,Bong Soo Kim 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hybrid electrical vehicles are very popular due to their extended operating range, reduced emission, improved fuel economy and rapid refueling. They are powered by an internal combustion engine and an electrical motor which driven by a battery. Battery is charged either by the engine or by ‘regenerative’ braking, which otherwise dissipated in the form of heat to the atmosphere. In order to realize the best use of hybrid vehicles, an optimal power distribution between the engine and battery is required. In this paper dynamic programming technique and rule-based control methods are discussed to develop a power controller which would control the power distribution. Dynamic programming technique cannot be applied for real time applications due to their preview nature and computational complexity. But it is suggested that it can be used to improve efficiency of rule-based control method.
Porous Medium Reactors in Diesel Engine For Reduction Of Emission
Ho Beom Ki,Le Duc Chien,Kwak Yong Hwan,Jae Ou Chae,Bong Su Kim 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Applying Porous Medium (PM) as a heat reactor in diesel engine has been considered as a promising concept to approach a near-zero emission system. It takes full advantage of PM geometry and material char acteristics to perform homogeneous combustion, therefore reduces significantly emission under all operational conditions. The surface characteristic of PM plays a key role in fuel vaporization process inside the combustion chamber. This paper summarizes the results of our recent effort in applying plasma technology to improve its surface characteristic. The research activities focused on preventing reactor surface from forming, sticking of soot and unburned liquid fuel. It helped to increase specific area, energy recirculation efficiency and enhance vaporization ability of fuel during injection process.
Nguyen Van Hieu,Le Thi Ngoc Loan,Nguyen Duc Khoang,Nguyen Tuan Minh,Do Thanh Viet,Do Cong Minh,Tran Trung,Nguyen Duc Chien 한국물리학회 2010 Current Applied Physics Vol.10 No.2
In this paper, a very simple procedure was presented for the reproducible synthesis of large-area SnO2nanowires (NWs) on a silicon substrate by evaporating Sn powders at temperatures of 700, 750, and 800 ℃. As-obtained SnO2 NWs were characterized by field emission scanning electron microscopy (FESEM),transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy. They revealed that the morphology of the NWs is affected by growth temperature and the SnO2 NWs are single-crystalline tetragonal. The band gap of the NWs is in the range of 4.2–4.3 eV as determined from UV/visible absorption. The NWs show stable photoluminescence with an emission peak centered at around 620 nm at room-temperature. The sensors fabricated from the SnO2 NWs synthesized at 700 ℃ exhibited good response to LPG (liquefied petroleum gas) at an operating temperature of 400 ℃.
Nguyen Thi Thuy,Phuong Dinh Tam,Mai Anh Tuan,Anh-Tuan Le,Le Thi Tam,Vu Van Thu,Nguyen Van Hieu,Nguyen Duc Chien 한국물리학회 2012 Current Applied Physics Vol.12 No.6
The present paper introduces a facile and cost-effective route for the direct dispersion of multi-walled carbon nanotubes (MWCNTs) in DNA solution. Their application in detecting Escherichia coli O157:H7using DNA biosensorwas demonstrated. The dispersion state of theMWCNTswas characterized via UVeVis spectroscopy, transmission electron microscopy, and field emission scanning electron microscopy. The interaction between DNA sequence and the MWCNTs was investigated using Raman spectroscopy and Fourier transform infrared spectroscopy. As-obtainedMWCNT solutionwas used in the preparation of DNA sensor. Results revealed that the developed DNA sensor can detect a DNA target as low as 1 nM in a buffer solution. The sensitivity of the DNA sensor reached approximately 0.19 nM/mV. The effect of dispersion parameters, including pH values, DNA concentration, ion strength, and sonication time, on sensor response was also studied. TheDNA sensor can respondwell to 120 min of sonication time, a pH value of 9, and 20 mM of DNA sequence concentration. The results of the present study showed a potential application of the DNA sensor in the detection of Escherichia coli O157:H7.
Thanh-Tung Duong,Ta Quoc Tuan,Dang Viet Anh Dung,Nguyen Van Quy,Dinh-Lam Vu,Man Hoai Nam,Nguyen Duc Chien,윤순길,Anh-Tuan Le 한국물리학회 2014 Current Applied Physics Vol.14 No.12
Polyaniline nanowires (PANI NWs) were deposited onto fluorine-doped tin oxide (FTO) glass substrate using the cyclic voltammetric method with aniline monomer precursor in HCl aqueous solution. The secondary oxidation peak plays an important role in polymerization of aniline monomer and the optimization of catalytic activity of PANI-based counter electrodes was achieved by controlling the number of cycles. The photovoltaic performance of the dye-sensitized solar cells (DSSCs) with PANI NWs counter electrodes (CEs) was optimized at 4th cycles, and then following parameters were obtained: Jsc ¼ 17.2 mA cm2, Voc ¼ 0.71 V, FF ¼ 59.3%, and efficiency (h) ¼ 7.24%. While, Jsc ¼ 14.7 mA cm2, Voc ¼ 0.77 V, FF ¼ 70.6%, and efficiency (h) ¼ 7.98% in cells with Pt CEs. The PANI NWs were attractive as an alternative CEs for the low-cost DSSCs instead of Pt.