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Mullite fibers prepared by a sol-gel method using tartaric acid
Hongbin Tan 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.5
Long mullite fibers were prepared by a sol-gel method using aluminum nitrate, tartaric acid and tetraethylorthosilicate (TEOS). Thermogravimetry-differential scanning calorimetry (TG-DSC), Fourier transform infrared (FTIR) spectrometer, Xray diffraction (XRD), and scanning electron microscopy (SEM) were used to characterize the properties of the gel and ceramic fibers. The fibers with a uniform diameter were obtained by sintering at 1200 ο C, and theirs main phase was indentified as mullite.
One-Step Synthesis of Immobilized BiOCl Film with Excellent Adsorption Capacity for Dyes
Hongbin Chen,Wangmiao Fu,Xiang Yu,Yi Zhu,Hui Meng,Jinpeng Tang,Yuanming Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.8
A facile one-step method was developed for the first time to fabricate BiOCl film on Cu substrate by simply dipping the Cu substrate in the mixed solution containing HCl, glycol, H2O2 and BiCl3. This method shows the advantages of a simple technique, uniform and controllable morphology, as well as easy mass production. The absorption capacity of BiOCl film was investigated by adsorption of Rhodamine B and Congo red (CR) and their maximum adsorption capacities were 1667 mg g-1 and 1429 mg g-1, respectively. The negative values of free energy and the positive values of enthalpy suggested that the adsorption were spontaneous and endothermic, respectively. Moreover, both adsorptions were matched with the pseudo-second-order equation. This film could be reused and the recycle rates for Rhodamine B and CR were still about 95% and 75% after five cycles, respectively. The adsorption mechanism revealed that hydrogen bond mainly accounted for the adsorption of dyes.
Alumina phase transition and morphology development in a flux by adding silica
Hongbin Tan 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.6
Copper indium diselenide (CIS) layers, which are now showing promise as solar-cell materials, were successfully grown on GaAs (100) substrates using the hot wall epitaxy (HWE) method. The photoconductive CIS layers were grown along the direction having a beneficial gain for solar energy conversion. From the Hall effect measurements, the mobility tended to decrease as a function of T-3/2 in the high temperature range (T > 130 K), and increase as a function of T3/2 in the a low temperature range (T < 50 K). Also, from the photocurrent (PC) measurements, three peaks, A, B, and C, corresponded to the intrinsic transition from the valence band states of Γ7(A), Γ6(B), and Γ7(C) to the conduction band state of Γ6, respectively. The temperature dependence of the optical band gap obtained by the PC measurements could be expressed by using the empirical equation Eg(T) = Eg(0) - (8.57 × 10-4)T2 /(T + 129). By conducting solar cell fabrications, a 14.3% efficiency for n-CdS/p-CIS heterojunction solar-cells was achieved. This achievement suggests that the improved quality of the absorber layer, grown using the HWE method, contributes to the high performance of CIS solar cells.
Hongbin Kim,Gyoungho Lee 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.4
The purpose of this paper is to examine what are the most important ideas of special relativity (SR) education from Einstein’s perspective, to reflect on the previous studies of special relativity education up to the present through Einstein’s ideas, and to give prospects for its future direction. We analyzed Einstein’s book, The Evolution of Physics, focusing on three questions: Why should we teach SR? What kinds of the content knowledge of SR should we teach? How should we teach SR? Based on this analysis, we formulated three criteria for SR education: (1) intrinsic value, (2) integral knowledge, and (3) hermeneutic/communicative approach. In addition, research papers on SR education published in South Korea were analyzed based on these criteria. As a result, we have found that many studies are very different from Einstein’s perspective on SR education. And we discussed that, despite the researchers’ intentions, their studies are likely to lead other research on SR and educational practices toward the opposite of Einstein’s emphasis (i.e., instrumental purpose, fragmentary content knowledge, and partial/functional approach). Finally, we suggest Einsteinian Physics Education as a new way to improve not only SR education but also physics education in general from Einstein’s perspective.
Hongbin Wu,Jinjin Guo,Ming Ding 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.3
Considering the randomness and uncertainty of wind power, a reliability model of WTGs is established based on the combination of the Weibull distribution and the Markov chain. To analyze the failure mode quickly, we use the switch-section partitioning method. After defining the first-level load zone node, we can obtain the supply power sets of the first-level load zone nodes with each WTG. Based on the supply sets, we propose the dynamic division strategy of island operation. By adopting the fault analysis method with the attributes defined in the switch-section, we evaluate the reliability of the distribution network with WTGs using a sequential Monte Carlo simulation method. Finally, using the IEEE RBTS Bus6 test system, we demonstrate the efficacy of the proposed model and method by comparing different schemes to access the WTGs.
Energy-Efficient Base Station Sleep Scheduling in Relay-Assisted Cellular Networks
( Hongbin Chen ),( Qiong Zhang ),( Feng Zhao ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.3
We Relay-assisted cellular network architecture has been developed to cover cell-edge users and to improve capacity. However, the deployment of relay stations (RSs) in cellular networks may increase the total energy consumption. Though energy efficiency has become a major concern in cellular networks, little work has studied the energy efficiency of relay-assisted cellular networks by sleep scheduling. In this paper, a distributed base stations (BSs) sleep scheduling scheme in relay-assisted cellular networks is proposed. The goal is to maximize the energy efficiency under the spectral efficiency constraint. Firstly, whether the BSs should be sleeping or active is determined by the traffic profile. Then, the transmission powers of the active BSs are optimized within the game-theoretic framework, by using an interior-point method, so as to maximize the energy efficiency. Simulation results demonstrate that the effectiveness of the proposed scheme is superior to that turning on all the BSs without sleep scheduling.
Hongbin Li,Wenying Shi,Shuo Mei,Jinchao Li,Qiyun Du,Longwei Qin,Haixia Zhang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
Poly(p-phenylene terephthalamide) (PPTA), as the raw polymer material of Aramid fiber-1414, has high modulus and high strength which is commonly used in the reinforced composites. However, the general blending often accompany the microphase incompatibility in polymer matrix. In this study, PPTA molecules were incorporated into poly(vinylidene fluoride) (PVDF) membrane matrix through in situ polycondensation of p-phenylene diamine (PPD) and terephthaloyl chloride (TPC) in PVDF solution and PPTA/PVDF molecular composite membranes were prepared via the subsequent nonsolvent induced phase separation (NIPS) process. The anti-compaction properties of resulted PPTA/PVDF molecular composite membranes were systematically investigated including the variations of bursting pressure and membrane thickness, porosity, pure water flux under different pressures. The results suggested that membrane comprehensive anticompaction properties were improved with the increasing of PPTA content in PVDF membrane matrix. Combining the variation trends of membrane anti-compaction properties with morphologies, the compaction-deformation evolution processes of two membrane pore types (sponge-like and finger-like pores) were proposed at the end.
Performance Assessment of Cascade Control Strategy in Wastewater Treatment Process
Hongbin Liu,MinJung Kim,JungJin Lim,ChangKyoo Yoo 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
As the public awareness of environmental protection increases and the environmental regulations become more stringent, effective control of the wastewater treatment process (WWTP) has become a research hotspot. In this paper, a cascade MPC and PID control strategy is introduced to the Benchmark Simulation Model 1 (BSM1). The proposed cascade control structure is composed of a primary MPC controller to control the nitrate concentration in the effluent and a secondary PID controller to control the nitrate concentration in the final anoxic compartment. The suggested method controls the nitrate concentrations in the effluent as well as in the final anoxic reactor simultaneously to strictly satisfy the quality of the effluent as well as to remove the effects of disturbances more quickly by manipulating the external carbon dosage. Because the control performance assessment (CPA) technique has the features of determining the capability of the current controller and locating the best achievable performance, the other novelty of this paper is to take the CPA technology into the wastewater treatment process. The CPA results indicate that the primary MPC controller has more potential to improve compared with the secondary PID controller.