Advanced Materials Research Vol. 496

Abstract: lactic acid, inclined tube sedimentation, ultrafiltration, flow velocity Abstract This study combined inclined tube sedimentation with ultrafiltration to remove the particles and protein in lactic acid fermentation broth. The influence of flow velocity on the extract property was investigated as well as the variations of flux, protein removal rate and lactic acid recovery in ultrafiltration. The result indicated that the inclined tube sedimentation was effective to remove the particles of fermentation broth. When the flow velocity was 0.031cm/s, the percentage of particles smaller than 10μm was 77%. The flow velocity 0.143cm/s in inclined tube sedimentation was more suitable in this study. SS removal rate can achieve 45.5% while protein removal rate and lactic acid recovery can be maintained above 90% in such situation

Abstract: Utilizing first-principles density functional theory calculations, we identify that weak adhesion of metal clusters (for example Cu and Au) on pristine MOF-5, IRMOF-3, IRMOF-3-OH and IRMOF-3-SH, which reveals that metal clusters may be unable to stably exist in the pore of MOFs. Furthermore, upon removing the hydrogen of NH₂, SH and OH functional groups, the adsorption energy between metal cluster and functionalized MOFs improve, which ascribes to chemical adsorption. Meanwhile, these metal clusters become cationic as a result of the formation of metal-O, S or N adhesion bonds. Hence, our study may provide a candidate approach to deposit metal clusters into the pore of MOFs.

Abstract: It’s provided a selection of basis on Xe-lamp sources of output full spectrum of solar simulator by inducing light-emitting principle, spectral characteristics, power calculation and so on. than combined with the test result by spectrometer is presented evaluation method of spectroscopy. At last It summarized the methods of Xe-lamp source installation and accessories use.

Abstract: The gasket stress distribution was analyzed by finite element method (FEM). The leakage of bolted flanged connections was predicted based on gasket stress distribution, and the results were investigated and compared with the experimental results. The effect of gasket stress distribution on connection leakage was studied. The results indicated that the flange rotate enlarged along with increasing of bolt load, and the inhomogeneity of gasket stress distribution improved, and then the difference value of average gasket stress and maximum gasket stress expanded. The maximum gasket stress located at the gasket outer periphery is found to be a key parameter that controls leakage.

Abstract: A rigid-flexible coupling dynamic model is established for the grinding roller system of an Horomill. Two coordinates are chosen to describe the grinding roller motion, namely the linear displacement of the roller at the center of mass and its rotation around the centroid on the applied plane of the grinding forces. The grinding forces applied on the roller are simplified to be a force and a torque, acting respectively on the direction of two coordinates. The frequency response function (FRF) matrices, with the two grinding force components as input and the vibration acceleration responses of two measuring points on the roller as output, are obtained respectively by using multibody dynamics computational software. The auto-PSD and cross-PSD of the vibration response on two measuring points are known. An inverse pseudo excitation method (IPEM) is then used for solving the grinding dynamic load spectrum. The obtained load spectrum would be helpful for the Horomill dynamic design and the fatigue calculation.

Abstract: In order to use the parallel leg mechanisms in the six-legged robot, a six-legged walking robot with parallel leg mechanisms was presented. A six-legged walking robot type synthesis method based on screw theory was proposed. By this method, the paper carried on the structural synthesis of whole robot and the parallel leg mechanisms. 2-UPS&UP mechanism was chosen as the leg mechanism of the six-legged walking robot. 2-UPS&UP mechanism had been proven not to be an instantaneous mechanism by the displacement manifold theory. The specific structure of the six-legged walking robot based on2-UPS&UP mechanism was designed. These studies laid the theoretical foundation for further study of the six-legged walking robot. This type synthesis method could be used for the design of other multi-legged walking robot.

Abstract: In this paper, we present the calculated conductance of the rippled zigzag graphene nanoribbon and study the electron transport properties with different amplitude and period of the ripple. Based on the obtained results we find that, the conductance exhibits oscillation when the direction of the ripple is parallel to the direction of electronic flow and we ascribe it to the strain-induced modulated potential. For the second configure when the direction of the ripple is perpendicular to the direction of the electronic flow, we find that the conductance when energy varied around 0eV increases and then decreases with changing amplitude, for which the reason is still unknown.

Abstract: To develop anti-fouling coatings, the effect of nano-ZnO on properties of coatings based on FEVE copolymer was investigated in the paper. 8 coatings were prepared with controlling the content of nano- ZnO respectively 0%, 2%, 4%, 6%, 8%, 10%, 15% and 20 wt %. The mechanical properties and hydrophobicity of coatings were measured. Morphology of coatings were observed by SEM. Roughness was measured at the centre of along diagonal with rugosimeter Hommel T-6000. The results showed that nano-ZnO influences gloss, impact-resistance, and hydrophobicity of coatings. It does’t influence obviously the adhesive of the coatings to substract. The hydrophobicity and roughness of coatings increases with the augment of content of nano-ZnO in coatings. The impact-resistance decreases with the augment of content of nano-ZnO in coatings. When the content of nano-ZnO exceeds 15%, the surface roughness of coatings gets obviously bigger.

Abstract: The optimal conditions of prepared magnesium hydroxide using dolomite as raw material were systematically explored by carbonization. The influence between the factors of reactions and the extraction rate of magnesium hydroxide was studied. The structure and composition of product were analyzed by Fourier transform infrared spectrometer, X ray diffraction and electron microscopy. In the conditions, the extraction rate could be up to 90.32%, and its crystal was a hexagonal-type. This method has many kinds of advantages, such as simple operation, low costs of production, eliminating the environmental pollution and comprehensive utilization of by-products.

Abstract: A novel all-polymeric material with high dielectric constant (k) has been developed by blending poly (vinylidene fluoride) (PVDF) with polyamide-6 (PA6). The dependence of the dielectric properties on frequency and polymer volume fraction was investigated. When the volume fraction of PA6 is 20%, the dielectric property is better than others. The SEM investigations suggest that the enhanced dielectric behavior originates from significant interfacial interactions of polymer-polymer. The XRD demonstrate that the PA6 and PVDF affect the crystalline behavior of each component. Furthermore, the stable dielectric constants of the blends could be tuned by adjusting the content of the polymers. The created high-k all-polymeric blends represent a novel type of material that are simple technology and easy to process, and is of relatively high dielectric constant, applications as flexible electronics.