Advanced Materials Research Vols. 183-185

Abstract: The optimal conditions of immobilization were obtained: the optimization of crosslinking agent concentration 10%, crosslinking time 2 hours、crosslinking temperature 40°C, pH 6.0, enzyme dilute multiples 500, PEB ion concentration 2.0M, immobilization time 6h and immobilization temperature 30°C, respectively.

Abstract: Chitosan has the potential to act as mediators of DNA transfection targeted to phagocytic cells such as macrophages, and to protect against biological degradation by nucleases as well as enhance gene expression. However, the poor solubility of Chitosan is the major limiting factor in its utilization. 2-hydroxypropyltrimcthyl ammonium chloride Chitosan has be prepared successfully through covalent binding of 2,3-Epoxypropyltrimethylammonium chloride ligands to the polymer’s primary amino groups and the polymer’s structure was verified with FT-IR spectra and NMR spectra. The new polymers were obtained with degree of quaternization (DQ) values around 34%, except in the case of the Phe-derived polymer, and thus possess reduced net positive charge as compared to the parent Chitosan. This study provided the new peptide-Chitosans with full water-solubility over practically the entire physiological pH range and led to more disordered. Globally, the new peptide Chitosans and especially the Asp-derived polymer, possess physico-chemical properties that turn them into promising candidates as novel Chitosan-based vaccine delivery systems.

Abstract: The effect of physical properties on the interfacial adhesion properties of fiber reinforced nylon66 composites have been investigated in this paper. The microstructure of fibers was observed using scanning electron microscopy (SEM), atomic force microscopy (AFM) and energy dispersive X-ray (EDX). The results revealed that smooth sizing with some tiny and uniform protuberances can enlarge the surface area of the glass fiber, and increased the wettability of resin to glass fiber, so as to increase the interfacial adhesion properties of the glass fiber/resin composites. In addition, the properties of the intheface between glass fiber and composites have been studied by interfacial shear strength (IFSS) and dynamic wetting method.

Abstract: In the research, old newspaper recycling fiber-reinforced polylactic acid composites were produced by using injection molding technology. The influences of MAPP coupling agent and newspaper alkali deinking treatment on the performance of composite materials were studied. The results showed: MAPP can effectively improve the compatibility of old newspaper recycling fibers and PLA and increase the mechanical properties of composites; the alkali deinking treatment can effective improve the adhesion of newspaper recycling fibers and PLA and increase the mechanical properties of composites.

Abstract: This work aims to remove virus bioaerosol by using carbon nanotube corona discharge plasma technology. The λ virus bioaerosols are generated using a Collison nebulizer, as the challenged bioaerosols. Exactly how various factors, including the flow rate (30, 60, and 90 lpm) and the operating voltages (-1.5, -3.0, -4.5, -6.0, and -7.5 kV), affect the bioaerosol reduction characteristics is also evaluated. Experimental results indicate that the corona discharge while using the carbon nanotube electrodes obviously decreases the threshold voltage of plasma. The removal efficiencies of λ virus bioaerosols by using the carbon nanotube corona discharge system at discharge voltages of -1.5, -3.0, -4.5, -6.0, and -7.5 kV are 53%, 60%, 68%, 89%, and 91%, respectively. Additionally, the corona discharge system that incorporates use of the carbon nanotube electrodes performs far superior to that incorporates the use of the stainless steel electrodes in terms of bioaerosol removal efficiency.

Abstract: It makes a brief description of the transportation machine providing disaster relief. The paper makes a deep analysis and founds a scheme on the walking mechanism of the transportation machine sending relief to a disaster area, illustrates the relationship among the mechanism structure, component size, tracks and kinematic parameters of the foot. It makes an experimental prototype design which through the analysis before, embeds the scheme into the design parameters, and conducts an actual verification about the results of theoretical derivation. The results proved the feasibility of the design, and reflected the impact factors. It will lay the theoretical foundation for the walking mechanism’s design and research of the transportation machine providing disaster relief, and will be in favor of the development and utilization of the transportation machine providing disaster relief in the new period.

Abstract: Based on remote sensing and field measured data, this paper discussed the effectiveness of selecting optimal variables with a cross-variable by VIP≥1 and used partial least squares regression (PLSR) to build a model for estimating surface soil organic carbon of burned area. The results showed that: variables such as K-T1, K-T2, TM2, TM4, and TM5/TM4 have larger contribution to the model, their VIP values were 1.5116, 1.1915, 1.3545, 1.2242 and 1.4275, respectively. The intensity index of Tasseled Cap transformation has a higher value than the original bands of TM2 and TM4, and the contribution of bands ratio is higher than the single band. Further, the PLS model was applied to estimating the special distribution of soil organic carbon (SOC) content (unit in g.kg^-1) in entire study area. We conclude that different fire intensity affected on soil organic carbon variously, and followed an order as high intensity>moderate intensity>light intensity. The average density of surface soil organic carbon was 12.53 kg per m², soil organic carbon storage was 202.46×10⁶kg, the fire-released soil organic carbon was 29.8×10⁶kg in study area.

Abstract: Multi-axis winding machine can realize automatic winding of composite elbow, but its mechanical structure and control system is complex, which restricts its industrial application. In this paper, two-axis FRP elbow winding machine applied teaching and playback method is designed, which accomplish the winding of elbow by controlling the rotation motion of the mandrel and the reciprocating motion of the carriage along a semicircular track. In teaching mode, the positions of spindle and carriage are collected and stored as teaching document when the spindle rotates a certain angle, while in playback mode the control method of electronic cam is applied to realize the playback winding. The mechanical structure and the working principle of elbow winding machine are introduced, and the control system of winding machine is analyzed. It is proved that the system is stable, and it can wind certain type of composite elbows.

Abstract: Nonmetal (S, P) doped titania nanoparticles were synthesized by a one step hydrothermal method. These samples were calcined with different temperature, the sample exist in anatase phase has much higher photocatalytic activity for methylene blue (MB) degradation. The visible response and the higher UV activity of the different nonmetal doped TiO₂ make it possible to utilize solar energy efficiently to execute photocatalysis processes. The resulting materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), etc. It can conclude the nonmetal doping TiO₂ proves to be more suitable to improve the photocatalytic performance.

Abstract: Polyvinyl acetate（PVAc）hybrid emulsions with nanoparticles SiO₂ were prepared by the semi-continuous seeding emulsion polymerization. The micro-morphologies of the hybrid emulsions, the diameters and distributions of the latex particles were characterized with the aid of scanning electron microscope (SEM) and diameter analyzer. Adhesive properties of hybrid emulsions and the properties of the emulsion films were determined by mechanical properties tester and dynamic mechanics analyzer (DMA). And the rheological behaviors of hybrid emulsions were measured via rheometer. SEM and diameter analysis showed that the process of the nanoparticles SiO₂ by ultrasonic made a good dispersibility of latex particles in emulsions, diameters of the latex particles were 0.68~0.89μm with the content of SiO₂ from 0 to 1.0% (% in relation to the total mass VAc), and indexes of distributions of particle size were increased with the increasing of the content of SiO₂ from 0 to 1.0%. Adhesion strengths of PVAc emulsions modified with nanoparticles SiO₂ were improved. DMA results indicated that the films of PVAc/SiO₂ hybrid emulsions had the higher storage modulus than the film of PVAc, the temperatures of glass transition of the films of PVAc/SiO₂ hybrid emulsions were not changed obviously, and the water absorptions of films were decreased. Rheological results revealed that flow consistency indexes were increased then decreased with the increasing of the content of SiO2 from 0 to 1.0%, and PVAc/SiO₂ hybrid emulsions were typical pseudoplastic fluid.