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Vı´ctor Manuel Aceituno Melgar,김진수,Mohd Roslee Othman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Zeolitic imidazolate framework (ZIF)-based membranes are emerging materials that are highlyattractive for gas separation and purification. Highly reproducible defect-free ZIF membranes with well-defined pore structures can be formed in a number of ways. The performance of ZIF membranes dependslargely on the preparation technique, application type, and operating conditions. Here, we review themethods of ZIF membrane preparation and discuss their performance in separating condensable andincondensable gases. In addition, recent developments in membrane synthesis and ways to improve thegas separation performance of ZIF membranes are discussed to promote industrial application andcommercialization of ZIF membranes.
Highly selective micro-porous ZIF-8 membranes prepared by rapid electrospray deposition
Vı´ctor Manuel Aceituno Melgar,안호원,김진수,Mohd Roslee Othman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Highly selective ZIF-8 membranes were successfully prepared by electrospray deposition for H2/CO2separation. This novel method produced ZIF-8membranes in a facile and time-efficientmanner using anelectrostatic force-assisted coating approach. In addition, the membrane thickness could be controlledeasily by simply varying the deposition time. Results from the experiment indicate that the membraneperformed preeminently in comparison with previously reported glassy and polymeric membranes forH2/CO2 separation. The H2 permeance of the ZIF-8 membrane prepared at 70 8C for 55.71 min was4.23 10 7 mol m 2 s 1 Pa 1 with H2/CO2 selectivity of 20.3.
A comparative analysis of the efficiency of national education systems
Claudio Thieme,Vı´ctor Gime´nez,Diego Prior 서울대학교 교육연구소 2012 Asia Pacific Education Review Vol.13 No.1
The present study assesses the performance of 54 participating countries in PISA 2006. It employs efficiency indicators that relate result variables with resource variables used in the production of educational services. Desirable outputs of educational achievement and undesirable outputs of educational inequality are considered jointly as result variables. A construct that captures the quality and quantity of educational resources consumed is used as resource variables. Similarly, environmental variables of each educational system are included in the efficiency evaluation model; while these resources are not controllable by the managers of the education systems, they do affect outcomes. We find that European countries are characterized by weak management, the Americans (mainly Latin Americans) by a weak endowment of resources, and the Asians by a high level of heterogeneity. In particular, Asia combines countries with optimal systems (South Korea and Macao-China); countries with managerial problems (Hong Kong, China-Taipei, Japan and Israel); others where the main challenge is the weak endowment of resources (Jordan and Kyrgyzstan), and, finally, others where the main problem is in the long run since it concerns structural conditions of a socioeconomic and cultural nature (Turkey, Thailand, and Indonesia).
YSZ-carbonate dual-phase membranes for high temperature carbon dioxide separation
안호원,김대호,Vı´ctor Manuel Aceituno Melgar,김진수,Mohd Roslee Othman,Hoang Viet Phuc Nguyen,한종희,윤성필 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A dense yttria stabilized zirconia (YSZ)-carbonate membrane that was impermeable to gas at low temperature became highly permeable to CO2 at temperature above the melting point of the carbonate. The CO2 permeance across the YSZ-molten carbonate dual-phase membrane was observed to be higher than 0.1 × 10-8 mol/m2/Pa/s at temperature >650 ℃. The movement of ions was promoted at high temperature as YSZ and molten carbonate became highly conductive to oxygen ions and carbonate species, respectively. Addition of poly(methyl methacrylate) (PMMA) during preparation of macro-porous YSZ support created interconnected pore structures that were found conducive for carbonate infiltration and integration with the membrane materials.
M.D. Vı´ctor-Ortega,J.M. Ochando-Pulido,A. Martı´nez-Ferez 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
The performance of a fixed-bed cation exchange process was examined for final purification of the ironload derived from catalyst usage in the secondary treatment of olive mill wastewater, which led tounacceptable iron levels. Results showed an increase in the pH value up to 4 enhanced the iron ionexchange (IE) efficiency, which decreased upon higher pH. Furthermore, Thomas model provided utmostaccurate dynamic behavior modeling for all inlet concentrations studied (20, 50 and 100 mg L 1). Additionally, up to 100% recovery efficiencies were maintained even after 10 complete cycles. Finally, aneffluent with quality for irrigation reuse was obtained.
Optimization of ultrasonic-assisted extraction of phenolic compounds from Justicia spicigera leaves
Luis Miguel Anaya-Esparza,Denı´ Ramos-Aguirre,Vı´ctor Manuel Zamora-Gasga,Elhadi Yahia,Efigenia Montalvo-Gonza´lez 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.4
A Box–Behnken design (Extraction-time, pulsecycle, sonication-amplitude) was employed to extract phenolic compounds from Justicia spicigera leaves by ultrasonic-assisted extraction. The muicle leaves extracts were analyzed measuring total phenolic compounds and antioxidant capacity. According to response surface methodology the optimal conditions of ultrasonic-assisted extraction to obtain the highest soluble phenolic content were 2 min (extraction time) for 0.7 s (pulse cycle) at 55% of sonication amplitude. Under these optimal conditions, the total phenolic content was higher when was used ultrasonic-assisted extraction (54.02 mg/g) than stirring (46.46 mg/g) and thermal decoction (47.76 mg/g); however, the antioxidant capacity from J. spicigera extracts did not increase by ultrasonic-assisted extraction. The extracts or aqueous infusions from J. spicigera leaves are used for therapeutic proposes, therefore the ultrasonic-assisted extraction is a useful technology to improve the extraction of phytochemicals from J. spicigera leaves.
Fast reduction of Cr(VI) from aqueous solutions using alumina
Fabiola Glorias-Garcia,Jose´ Miguel Arriaga-Merced,Gabriela Roa-Morales,Vı´ctor Varela-Guerrero,Carlos Eduardo Barrera-Dı´az,Bryan Bilyeu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Hexavalent chromium is challenging to remove from industrial wastewater due the solubility and anionic nature of the chromates. Cr(VI) is typically removed by reduction to Cr(III), then precipitation or adsorption, which requires multiple steps and bulk reagents and generates sludge. In this project, we have evaluated a sintered alumina disk as a single step sorbent for Cr(VI). The disk was porous enough that 20 mL samples passed through in about 3 s using light suction. A single pass through the disk only reduced the [Cr(VI)] by 10–20%, but by passing the solution through the disk five times up to 80% was removed in samples up to 130 mg/L and up to around 50% for much higher concentrations. The five passes through the filter disk took less than a minute. On each pass through the disk the characteristic chromate UV–vis absorbance decreased, the Cr(VI) concentration (by the diphenylcarbazide method) decreased, and the pH rose slightly. The XRD pattern showed no change in the crystal structure of the alumina, but the SEM/EDS identified chromium on the surface. In addition to confirming chromium on the surface of the alumina, the XPS spectra showed a change in the binding energy of the aluminum, which is consistent with complexation. The system was fast and effective (in series), so should be applicable to industrial wastewater treatment.