Flight Performance Optimization Considering Environmental Impact Under Multi-RTA Constraints

Runping Gu,Jie Yuan,Xiaolan Han,Zhiqiang Wei,Na Li 한국항공우주학회 2019 International Journal of Aeronautical and Space Sc Vol.20 No.4

To optimize the flight performance under multi-waypoint required time of arrival constraints, characteristics of the vertical flight trajectory during the en route descent process are studied. A multi-constraint segment sequence model including flight distance, flight altitude and arrival time is constructed. To ensure the rationality of constraints, the rationality detection model for multi-constraint is established. The control variables and their variation ranges are determined by analyzing the optimization process. Mathematical models of optimization objectives are studied from three aspects: fuel economy, greenhouse effect and variation of flight speed. Based on the multi-objective genetic algorithm, the optimization solution model is established. Effects of speed on the objectives are analyzed. The results indicate that the optimization model can effectively optimize the flight parameters with multiple RTA constraints. The impact of aviation on the environment can be effectively reduced. And the optimization method has a good trade-off between fuel consumption and temperature rise by changing weighted factors. Optimization results of the flight parameters are mainly affected by the maximum RTA time constraint. The proposed optimization method provides a reference for the optimization of flight parameters and trajectory under multi-RTA constraints in four dimensions.

Study of Omnidirectional Reflection Band Gap Extension in One-Dimensional Quasi-Periodic Metallic Photonic Crystal

XUYANG XIAO,Runping Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.6

"The reflection properties of light wave propagation in one-dimensional quasi-periodic metallic photonic crystal (PC) are comprehensively analyzed by transfer matrix method. In this work, we form a Fibonacci sequence quasi-periodic PC composed of metal and dielectric. The results demonstrate that the reflection stop band is strongly dependent on the periodic structure, metal thickness and incident angle. For this structure, the reflection stop band ranges from the visible light region to near-infrared region. Compared with the periodic metallic PC, the reflection stop bandwidth of our structure is wider. When the metal thickness increases, the reflection stop band is significantly enlarged. Furthermore, the reflection stop bandwidth slowly gets narrow and shifts to short wavelength region with the increase of incidence angle. Considering TE and TM wave at all incident angles, there is an omnidirectional reflection bandgap with width of 241 nm for our investigated quasi-periodic metal PC."

ULTRASONIC PREPARATION AND OPTICAL PROPERTIES OF HgWO4 NANOSHUTTLES

YAPING DING,RUNPING JIA,QINGSHENG WU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.1

A newly luminescent nanomaterial, monoclinic wolframite-type HgWO4 nanoshuttles (length: 200–300 nm; diameter: 100–150 nm) is prepared through ultrasonic method. For HgWO4 nanoshuttles, the fluorescent (FL) emitting peaks at 430 and 330 nm obviously blue shift compared with those of corresponding bulk crystals. Meanwhile, the latter almost disappear after ultrasonic irradiation procedure. A UV-visible blue-shifted (about 130 nm) absorption peak is observed at 280 nm and a new absorption peak is observed at 203 nm. FTIR results show all absorption peaks below 800 cm-1 shift to a longer wavenumber region, whereas those above 800 cm-1 remain invariable. All those unique optical performances might result from both quantum size effects and the involvement of the incompact d10 electrons. Moreover, the possible synthesis mechanism of HgWO4 nanoshuttles is also investigated.

Adsorption of p-chlorophenol and p-nitrophenol in single and binary systems from solution using magnetic activated carbon

Yachan Rong,Runping Han 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6

Magnetic activated carbon (MAC) was prepared by co-precipitation. These particles had attractive adsorption capacity and could be easily separated from aqueous. MAC was used as adsorbent to remove p-chlorophenol (p- CP) and p-nitrophenol (p-NP) from solution in single and binary systems. In a single system, the equilibrium time was 60 min, the best initial pH was 3-8 and 3-6 for p-CP or p-NP adsorption, respectively. The existence of salt ions had little influence on the adsorption process, while surfactant had negative influence. The adsorption quantity from experiments was up to 97.3mg·g1 for p-CP and 116mg·g1 for p-NP at 293 K, respectively. Freundlich model and pseudosecond- order kinetic model fitted well the adsorption behavior. Thermodynamic parameters were calculated and the results showed that the process was spontaneous, exothermic and entropy production in nature. In addition, p-CP or p- NP-loaded MAC could be well reused by 0.01 mol·L1 sodium hydroxide solution as regeneration agent. Kinetic process of desorption was fitted best by pseudo-second-order kinetic model. Results from the binary system showed that competitive adsorption existed during the process, and p-NP adsorption on MAC was easier than p-CP. Freundlich model well fitted the adsorption behavior in the binary system. Hydrogen-bonding, electron donor-acceptor and - interactions may be the main mechanisms of adsorption. MAC proved to be an excellent adsorbent for the removal of p-CP and p-NP from solution.

The protection and empowerment of Indonesian female migrant domestic workers : Proposals from a multi-stage analysis

Rosita TANDOS,Runping ZHU,Richard KREVER 이화여자대학교 한국여성연구원 2022 Asian Journal of Women's Studies(AJWS) Vol.28 No.2

Migrant female domestic workers are subject to an overarching system of isolation, subordination, and exploitation due to the intersection of their gender, low education, and foreign-migrant status. This is a study of Indonesian female migrant domestic workers and their actual experiences in the six distinct stages of their journey that have not been previously acknowledged. This enabled us to uncover the distinct exploitation and abuse problems they encountered at different stages and propose how these problems may be addressed, apart from formulating proposals for fundamental reform. We conclude by identifying ways in which the problems can be mitigated, or even fully addressed in some cases, through more active intervention by their home country.

Media Use by Immigrants in the Process of Cultural Adaptation

HAO XIAOMING,ZHU RUNPING 한국언론학회 2004 Asian Communication Research Vol.1 No.1

PHOTOLUMINESCENT ENHANCEMENT OF HgWO4 NANOFILMS USING TiO2 ADJUSTMENT

XIN-YAO HE,RUNPING JIA,CHUN-FA OUYANG,XIA WANG,JUN-HE YANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.6

As a new nanomaterial, HgWO4 nanofilms are prepared by the self-inventive technique of collodion nanoparticles-dispersal and film-formation. Their photoluminescent properties are enhanced and then controlled through nano-TiO2 doping. These approaches not only ensure film uniformity and fluorescence (FL) enhancement, but also realize a FL increase/decrease conversion effect. The relationships between HgWO4 nanofilms' PL intensities and TiO2 doped amounts are in good agreement with Gaussion function, and maximum PL intensities of HgWO4 nanofilms are located at 3.8% ratio of TiO2 nanoparticles.

Adsorption of phosphate from aqueous solution by lanthanum modified macroporous chelating resin

Xiaoting Zhang,Chenghui Ma,Kang Wen,Runping Han 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.5

A highly effective adsorbent of lanthanum-modified D751 resin (D751 resin for macroporous styrene chelated resin, sodium form) was prepared to enhance the effect of removing phosphate from solution. FTIR, SEM were used to explore the functional groups and structural features on the surface of D751-La; XPS analyzed the action mechanism between phosphate and D751-La. The adsorption performance about D751-La toward phosphate was investigated by batch experiment. The results showed that Langmuir, Freundlich, Temkin, Koble-Corrigan as well as Redlich-Peterson models fitted well for the adsorption isotherms. The adsorption kinetics could be better fitted by Double Constant, Elovich, and Pseudo-second-order model. The effect of salinity was not significant, such as Cl and SO4 2. When the solid-liquid ratio was 15 g·L1 with setting the reaction time as 8 h, the unit adsorption quantity of D751-La to phosphate (calculated in P) reached up to 26.3mg·g1 under the solution pH=3 at 293 K. The process was spontaneous and exothermic from thermodynamic analysis. It shows that D751-La has potential to remove phosphate from solution.

Zirconium-functionalized loofah biocomposite for adsorption catechol and amoxicillin

Wang Junli,Liu Xu,Han Huayun,Han Runping 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.8

Cheap and green loofah as the substrate material was modified with epichlorohydrin and iminodiacetic acid (IDA) to obtain iminodiacetic acid-modified loofah (IDA-LG), and loaded zirconium (IV) onto IDA-LG by a simple complexation reaction to obtain novel biocomposite: zirconium-modified loofah (Zr-IDA-LG). The influence factors and adsorption mechanisms were explored by characterization and adsorption study toward catechol and amoxicillin in batch and fixed-bed modes. The study found that the surface morphology, specific surface area and internal functional groups of the adsorbent changed significantly, the isoelectric point of Zr-IDA-LG was shifted in the acidic direction (2.68 for Zr-IDA-LG) after the modification. This showed that modification of the loofah was successful. The adsorption of catechol and amoxicillin by Zr-IDA-LG showed that the pH range of the material was wide, and the coexisting ions had adverse effects on adsorption. The maximum adsorption capacity of Zr-IDA-LG from Langmuir model was 44.9±11.2 mg·g−1 for catechol and 16.8±;1.2 mg·g−1 for amoxicillin at 293 K. The adsorption isotherm and kinetic model of Zr-IDA-LG manifested that the adsorption process was dominated by monomolecular layer adsorption for catechol and monomolecular layer adsorption for amoxicillin with the presence of heterogeneous adsorption. Both adsorption processes were accompanied by ion exchange. The higher column and lower flow velocity were favorable for the fixed bed adsorption, while the Yan model could fit the fixed bed adsorption behavior. The adsorption quantity in column performance from breakthrough curves was to 20.0 mg·g−1 for catechol and 15.8 mg·g−1 for amoxicillin. Regeneration with 75% ethanol of spent Zr-IDA-LG was remarkable. The biocomposite is promising for removing some pollutants from water.

Removal of Cr(VI) from solution using UiO-66-NH2 prepared in a green way

Xiaoting Zhang,Shusheng Zhang,Gangfeng Ouyang,Runping Han 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7

A zirconium-based metal organic framework (UiO-66-NH2) was prepared using a greener approach forthe removal of hexavalent chromium (Cr(VI)) from solution. The characterization of UiO-66-NH2 was performedusing several methods, and the influence of the solution pH, adsorbent dosage, salt, adsorption time, Cr(VI) concentrationand adsorption temperature on adsorption quantity was performed in batch mode. UiO-66-NH2 can efficientlyremove Cr(VI) through the synergistic effect of adsorption and reduction. At pH solution of 1.1 and solid-to-liquidratio of 2 g·L1, the removal rate of 100mg·L1 Cr(VI) increased to 95.2%. The maximum adsorption capacity of UiO-66-NH2 from Langmuir model was 252mg·g1. The adsorption equilibrium process can be well described by Langmuir,Koble-Corrigan and Temkin models, while the kinetic process can be predicted by pseudo-second-order andElovich model. UiO-66-NH2 showed a good adsorption capacity in a wide range of pH (pH=1.1-10) and also had betterregeneration performance after five cycles using 0.01 mol·L1 NaOH; consequently, it can be a promising adsorbentfor the removal of Cr(VI) from solution.