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The performance of poly(DL-lactide-co-glicolide) (PLGA) nanoparticles without surfactant or emulsifiers was investigated by a dialysis method. The size of the PLGA nanoparticles prepared from dimethylacetamide (DMAc) as an intial solvent was smaller than that from acetone. The size of the PLGA nanoparticles from DMAc and acetone were 200.4 133.0 and 642.3 131.1 ㎚, respectively. the elects of initial solvent selected to dissolve the copolymer and the lactide:glycolide ratio were investigated. The PLGA nanoparticles were spherical as revealed by the results of scanning electron microscopy and transmission electron microscopy observations. from these results it was shown that PLGS nanoparticles could be fromed by the dialysis method without surfactant. The drug-loading contents and efficiency were also dependent on the lactide:glycolide ratio and initial feeding amount of the drug. A higher lactide ratio resulted in the higher drug loading and higher loading efficiency. However, a higher initial feeding amont of the drug resulted in higher drug loading and lower loading efficiency.
This paper presents a parameter identification of a flexible beam attached to a translating hub. A dynamic model of the beam-hub system is obtained by applying the Euler-Bernoulli beam theory, in which dynamic coupling between the beam and the hub is shown. The continuous model is discretized for utilizing identification purposes by the Galerkin method. Then, the identification process is conducted in the frequency domain along with modal analysis to determine unknown parameters of the system, where a vision system is applied to record the transverse vibrations of the beam. Finally, the validity of the identified parameter is verified by comparison of the measured vibrations of defined points of the beam-hub system with the simulation results.
Real estate markets play an essential role in the economic development of both developed and developing countries. Investment decisions in private real estate demand the consideration of several qualitative and quantitative criteria. Especially in Vietnam, demand for housing, apartments are rising which has resulted because of the migration from rural to urban areas. This study aims to determine the influencing factors of the real estate purchasing behavior and then recommend a grey Multi-Criteria Decision Making (MCDM) support model to evaluate real estate alternatives based on a numerical example in Vietnam. A set of essential criteria are identified based on experts' opinion, and the proposed determinants are initial investment, maintenance cost, prestige location, distance to interesting places, parking lot, public transportation, property condition, total area size, number of rooms, and neighbors. The subjective weights were obtained by using the Decision-Making Trial and Evaluation Laboratory (DEMATEL) model, and the Grey Relational Analysis (GRA) technique is employed to prioritize and rank real estate alternatives. The results reveal that this approach can be useful to make purchasing decisions for many kinds of real estate property under uncertain business environments. These findings indicate that the presented hybrid model has advantages in granting flexibility to the preferences of decision makers.
The surface modification of waste-gypsum (WG) fillers was investigated by using stearic acid as surfactant. The maximum amount of stearic acid (SA) that linked to the surface of the fillers was determined around 1.8 wt.%. The formation of a calcium stearate layer on the surface of fillers was elucidated by FTIR analyses, X-ray diffraction spectra, and thermal analyses (TGA). Polymer composites based on poly(vinyl chloride) (PVC) and coated WG fillers were prepared by the different processing instruments such as extruder, injection molding and two-roll mills with various content of the WG fillers. The effect of the addition of uncoated and coated WG fillers on rheology, physico-mechanical properties and morphological development of composites was discussed. The presence of coated WG fillers in mixture strongly affected to the processing parameters such as the decrease of mixing time during processing and the lower melt-viscosity in comparison with uncoated WG fillers. The dispersibility of coated fillers is also better than that of uncoated filler resulting in the higher toughness and the stiffness of composites. Among these composites were investigated, PVC/coated WG composite reached the optimum properties in the ratio of 22.56 wt.% of coated WG fillers.
A unified method for the fractional-order proportional-integral controller based on IMC scheme (IMC-FOPI) is proposed. The analytical tuning rules are derived for achieving the performance improvement in terms of both disturbance rejection and set-point tracking. Many illustrative examples are considered to confirm the effectiveness of the proposed algorithm for both integer and fractional-order processes with time delays. In addition, the robust stability of fractional-order systems are also carried out in order to demonstrate that the proposed controller can hold well the robustness against perturbation uncertainty in the process models.
The effect of addition of gypsum on the rheology, physico-mechanical properties, thermal properties and morphology development of polymer composites based on polyvinyl chloride (PVC) and waste-gypsum with and without methylene-butadiene-styrene (MBS) has been studied. It was shown that the replacement of gypsum for methylene-butadiene-styrene (MBS) component in PVC/gypsum polymer composites enhanced the tensile strength and stiffness of composites, but gradually decreased its impact strength. The observation of morphology, the results of the physico-mechanical properties and thermal properties proved simultaneously that PVC/gypsum composite with the waste-gypsum content of 22.56 wt% reached the optimum results among five kinds of PVC/gypsum polymer composite materials investigated.
Vu, Huong Giang,Ninh, Khac Ban,Nguyen, Xuan Nhiem,Phan, Van Kiem,Chau Van, Minh,Hoang, Le Tuan Anh,Pham, Hai Yen,Bui, Huu Tai,Nguyen, Xuan Cuong,Nguyen, Hoai Nam,Kim, Seung Hyun,Kwon, Young-In,Kim, Yo Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5