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Alisa Mehrparvar,Ahmad Rahimpour 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
In this study, new polymeric material namely polyether sulfone amide (PESA) containing hydrophilegroup was synthesized via polycondensation reaction of diamine with dicarboxylic acid. SynthesizedPESA was used as main polymer to fabrication of novel PESA UF membranes to improve the membraneproperties especially in view of fouling reduction. The PESA membrane was modified by grafting twohydrophilic monomers i.e. 3,5-diaminobenzoic acid (DBA) and gallic acid (GA) via interfacialpolymerization. The prepared membranes were characterized by contact angle measurement,equilibrium water content (EWC), scanning electron microscopy (SEM), atomic force microscopy(AFM), FTIR-ATR analyses. Membrane performance was evaluated by measuring the pure water flux andhumic acid (HA) solute separation with dead-end filtration system. As a result, the contact anglemeasurement showed that the PESA membrane had high hydrophilic surface. Also, super hydrophilicsurfaces were introduced by grafting DBA and GA on the surface of PESA membrane. The SEM imagesproved the formation of large finger-likes in the sublayer for PESA membrane. Filtration tests showedthat pure water flux and HA solution flux of the PESA membranes were higher in comparison to the PESmembrane. Although fluxes were obviously decreased after grafting monomers onto the PESAmembrane surface, higher HA separation efficiency was achieved. Meanwhile fouling tendency wasdecreased. All these results indicated that the new PESA modified membranes showed superiorperformance compared to the PES membrane. Furthermore, GA was found to be the most effectivehydrophilic monomer to improve the membrane hydrophilicity and fouling resistibility.
The DPJ and Women: The Limited Impact of the 2009 Alternation of Power on Policy and Governance
Alisa Gaunder 동아시아연구원 2012 Journal of East Asian Studies Vol.12 No.3
The Democratic Party of Japan (DPJ) saw forty of its forty-six female candidates elected in the 2009 lower house election; twenty-six were first-time candidates. Recently, both the Liberal Democratic Party (LDP) and the DPJ have supported more women as “change” candidates in response to changing electoral incentives that favor broad appeals. The DPJ's victory, however, has not had a large impact on women in terms of governance or policy. An exploration of child allowance, day care provision, and dual surname legislation under the DPJ reveals that low seniority and the lack of a critical mass have prevented DPJ women from overcoming significant veto points. The electoral incentives of the emerging two-party system have resulted in a larger number of women in office, but the volatility of the system has sustained a weak voice for women in policymaking.
Gaussian Approximation in Bayesian Method of Slotted Aloha Based for RFID System
Alisa Kittirattanaporn,Warakorn Srichavengsup,Suvit Nakpeerayuth,Lunchakorn Wuttitsittikulkij 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
This paper presents Gaussian approximation in Bayesian method of Slotted Aloha based. Three parameters are used to represent the probability distribution: 1) Mode of the probability distribution; 2) the parameter al for the Gaussian distribution on the left side; 3) the parameter ar for the Gaussian distribution on the right side. Simulation results reveal that the calculated probability distribution using three important parameters is close to the actual probability distribution. Although the Gaussian approximation can help reduce the storage memory compared to the Bayesian method, the proposed Gaussian approximation is a little bit less effective than the Bayesian method. That is, there is a trade-off between the throughput performance and memory requirement.
Alisa Šehić,Jelena Vasiljević,Igor Jordanov,Andrej Demšar,Jožef Medved,Ivan Jerman,Marija Čolović,Fiona Hewitt,T. Richard Hull,Barbara Simončič 한국섬유공학회 2018 Fibers and polymers Vol.19 No.6
This research investigated the influence of two flame retardant (FR) mixtures consisting melamine cyanurate (MeCy) and aluminum diethylphosphinate (AlPi), and MeCy and sodium aluminosilicate (SASi) at different weight ratios, on the flammability, thermal behavior and mechanical properties of polyamide 6 (PA6) composite yarns produced by meltspinning. The morphological and chemical properties of PA6/FR filaments were investigated by scanning electron microscopy and Fourier-transform infrared spectroscopy, flame retardancy by vertical burning test UL-94, thermal behavior by thermogravimetric and differential scanning calorimetric analyses, and mechanical properties by tensile tests. The results indicate that within the UL 94 V2 rating, the composite yarns differed significantly from each other in their burning and dripping behavior. The incorporation of both mixtures, MeCy+AlPi and MeCy+SASi, into the PA6/FR yarns significantly decreased the afterflame time relative to pristine PA6, confirming a lower production of flammable volatiles. This phenomenon was attributed mainly to MeCy, which caused an immediate extinguishment of the flame after the withdrawal of the igniting flame. Compared to one component MeCy, the incorporation of the MeCy+SASi mixture enhanced the thermooxidative stability of the PA6/FR yarns because of their additive effect at higher concentrations. In contrast, an antagonistic effect was obtained for the MeCy+AlPi mixture, irrespective of the concentration. Since the incorporation of MeCy+SASi did not drastically reduce the tensile properties of filaments, this mixture enables the production of the PA6/MeCy+SASi composite yarns with the enhanced flame retardancy and thermo-oxidative stability.
Alisa Mamaeva,Arash Tahmasebi,Jianglong Yu 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3
Catalytic microwave pyrolysis of peanut shell (PT) using Fe3O4, Na2CO3, NaOH, and KOH for production of phenolic-rich bio-oil was investigated. The effects of catalyst type, pyrolysis temperature, and biomass/catalyst ratio on product distribution and composition were studied. Among four catalysts tested, Na2CO3 significantly increased the selectivity of phenolic compounds in bio-oil during microwave pyrolysis. The highest phenolics concentration of 57.36% (area) was obtained at 500 oC and PT :Na2CO3 ratio of 8 : 1. The catalytic effect to produce phenolic compounds among all the catalysts tested can be summarized in the order Na2CO3>Fe3O4>KOH>NaOH. Using KOH and NaOH as catalyst resulted in formation of bio-oil with enhanced higher heating value (HHV) and lower oxygen content, indicating that these catalysts enhanced the deoxygenation of bio-oil. The scanning-electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) analysis of char particles showed the melting of magnetite and vaporizationcondensation of mineral salt catalysts on char particle, which was attributed to extremely high local temperatures during microwave heating.
Grabovskaya-Borodina, Alisa E.,Illarionova, Irina D.,Jang, Hyun-Do,Lee, Byoungyoon,Suh, Min Hwan,Park, Jeong Mi The National Institute of Biological Resources 2018 Journal of species research Vol.7 No.1
The review provides the information about 46 type specimens on 35 taxa of vascular plants from Korea (Fig. 1), kept in the Herbarium of the Komarov Botanical Institute of the Russian Academy of Sciences in addition to 150 taxa published before. Lectotype of Ligustrum patulum Palib is designated here.