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HOUSEHOLD WELFARE, INTERNATIONAL MIGRATION AND CHILDREN TIME ALLOCATION IN RURAL MOROCCO
JAMAL BOUOIYOUR,AMAL MIFTAH 중앙대학교 경제연구소 2014 Journal of Economic Development Vol.39 No.2
This paper examines the impact of remittances on child labor and education in recipient Moroccan households. Based on propensity-score matching methods, we find a positive effect of remittances on the investment in education. Furthermore, living in migrant households who combine school with work is clearly lower compared to the number of children from households of the control group. Our results show the positive effect of remittances on the schooling of the poor children. It also seems that the partial participation of poor children in work declines significantly through migrant remittances.
Study of Non-Newtonian fluid flow in porous media at core scale using analytical approach
Ryan Kurniawan Santoso,Iqbal Fauzi,Miftah Hidayat,Boni Swadesi,Bilal Maydika Aslam,Taufan Marhaendrajana 한국자원공학회 2018 Geosystem engineering Vol.21 No.1
Characterizing in situ polymer rheology in porous media is critical before further implementation of polymer injection in oilfield. Polymer as non-Newtonian fluid has unique behavior whose viscosity changes over various shear rate. This behavior creates unsuitable conditions which can lead to ineffective sweep efficiency improvement. The challenging issue in characterizing the in situ polymer rheology is how to construct the in situ Power Law model since the in situ viscosity cannot be measured directly. In this study, we use an analytical model to construct the in situ Power Law model. The model combines material balance equation, modified Darcy equation for non-Newtonian fluid flow, and equation of state. The model is solved for early (transient) time and late (steady-state) time. Coreflooding results in Berea Sandstone with 2000 and 500 ppm HPAM polymer injection are used for model’s simulations. Rheometer measurements are also used for comparison. The overall simulation results show there is no difference in flow behavior index between rheometer and porous media. The same fluid definitely gives the same flow behavior index through different measurement methods. However, there is significant difference in flow consistency index. It is caused by the effect of porous media’s tortuosity. The quantity of the skin parameter also depicts the thinning and thickening phenomena.
What Mitigates Economic Growth Volatility in Morocco?: Remittances or FDI
( Jamal Bouoiyour ),( Refk Selmi ),( Amal Miftah ) 세종대학교 경제통합연구소 2016 Journal of Economic Integration Vol.31 No.1
The purpose of the paper is twofold. First, it seeks to meticulously analyze the volatility of economic growth and financial flows in the case of Morocco, i.e., remittances and Foreign Direct Investment. Second, it attempts to address the effects of these financial flows on the economic growth volatility. We provide strong evidence that remittances are less volatile than Foreign Direct Investment with respect to the duration, intensity and volatility clustering. Furthermore, remittances can mitigate the volatility of growth, while Foreign Direct Investment flows amplify it. Our results do not imply that financial flows should be privileged by Moroccan authorities. In fact, our results should encourage the government to implement proactive and favourable policies geared towards productive investment.
Development of a novel ozone gas sensor based on sol-gel fabricated photonic crystal
Rahmat, M.,Maulina, W.,Isnaeni,Miftah, D.Y.N.,Sukmawati, N.,Rustami, E.,Azis, M.,Seminar, K.B.,Yuwono, A.S.,Cho, Y.H.,Alatas, H. Elsevier Sequoia 2014 Sensors and actuators. A Physical Vol.220 No.-
We have developed a novel ozone gas sensor based on one dimensional photonic crystal with two defects. In this platform, the gas is dissolved in a specific neutral buffer kalium iodide reagent to include the Beer Lambert effect. The corresponding photonic crystal which was fabricated by using sol-gel method consists of a high refractive index layer of TiO<SUB>2</SUB> and a low refractive index layer of SiO<SUB>2</SUB>. Prior to the fabrication of corresponding photonic crystal, we grew the TiO<SUB>2</SUB> and SiO<SUB>2</SUB> single layer separately in order to ensure that the performance of each layer fulfilled the required characteristics provided by our simulation. After that, the fabrication processed was conducted layer-by-layer and inspected by spectrophotometer. The performance test of the fabricated photonic crystal, including its validation, accuracy and sensitivity, was then conducted through spectroscopic treatment and we used ozonizer as the gas source. Validation test was performed by comparing the results with measurement using NBKI method and showed a good agreement. It was found that the accuracy value is up to 98.75%. Based on a statistical approach, we found that the limit of detection is 1.067μg/m<SUP>3</SUP> ambient air.
Dodi NANDIKA,Elis Nina HERLIYANA,Arinana ARINANA,Yusuf Sudo Hadi,Mohamad Miftah RAHMAN 한국목재공학회 2023 목재공학 Vol.51 No.3
Recently, the morphological and molecular features of five stain fungi infecting rubberwood (Hevea brasiliensis), namely Paecilomyces maximus, Paecilomyces formosus, Penicillium crustosum, Paecilomyces lecythidis and Aspergillus chevalieri, have been studied. Prior to this study, the authors revealed that catechin from gambir (Uncaria gambir) could inhibit the growth of the white-rot fungus Schizophyllum commune, and it was important to determine the bioactivity of the aforementioned agent against A. chevalieri. The efficacy of the biocidal agent was examined using a laboratory wooden block test. Rubberwood blocks, 8 mm in thickness, 20 mm in width, and 30 mm in length, were impregnated with catechin solution at concentrations of 6%, 9%, 12%, and 15% (w/v) using the vacuum-pressure method, and their bioactivity was monitored over three weeks through visual and scanning electron microscope assessment of fungal growth as well as the discoloration intensity of the wood samples. The results showed that catechin treatment increased the resistance of wood samples to A. chevalieri. Overall, the higher the catechin concentration, the lower the fungal growth. The lowest fungal growth was observed in the wood samples treated with 12% and 15% catechin (score of 0), demonstrating no discoloration. In contrast, the fungal growth score of the untreated wood samples reached 4, indicating severe discoloration. Catechins appear to be adequate biofungicides against stain fungi in rubberwood.