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Focusing on video steganographic, a method based on motion vector is proposed to solve the problem of low security and low quality of video after embedding. A set of the motion vectors with magnitude greater than a predefined threshold are selected. And the secret message is embedded in the vertical or horizontal component of those motion vectors through the proper range of the phase angle. Steganographic between the message and vector motion with pseudorandom sequence generated by key. Experimental results show that this method has low impact on cover video, and also has low computation cost, high anti-statistical properties based on motion vectors difference.

Using artificial light source to supplement light for submerged plants in water where the illumination is insufficient can promote the growth and improve the purification ability of submerged plants. The attenuation rule of underwater irradiation is the key to design and place the lamps. High-precision underwater spectrograph was adopted to study the underwater light spectrum and attenuation rule of underwater irradiation. The results showed that the attenuation rate of total irradiation (E) with depth (h) and turbidity (t) in algae water is the most remarkable; the relationships of E with h and t in different water were E1(t,h)=E0e-K(t)h=E0e-(0.1345t+0.1206)h(muddy water), E2(t,h)=E0e-K(t)h=E0e-(0.203t+0.4684)h(algae water) and E3(t,h)=E0e-K(t)h=E0e-(0.1708t+0.2279)h(mixed water). By these relationships, the position of artificial light could be calculated.

Many researchers have shown a great deal of interest in the effects that magnetic fields have when applied in chemical reactions, crystallization, magnetic separation of materials, magnetic levitation, materials processing, and wastewater treatment. However, surprisingly little research has been done on the effects of magnetic fields on the vapor-liquid equilibrium and the thermodynamic model for vapor-liquid phase equilibrium. The influence of magnetic fields on vapor-liquid equilibrium of binary heterogeneous azeotrope was investigated with ethanol-water in this paper. It was found that the vapor-liquid equilibrium of an ethanol-water system is influenced by the external magnetic field, but that the azeotropic point of the ethanol-water system is not changed by the magnetic field when the magnetic intensity reaches 0.8 T. Rather, the exerted magnetic field reduces the equilibrium temperature and shortens the distance between T-x curve and T-y curve in T-x-y diagram of the vapor-liquid equilibrium of the ethanol-water system. A thermodynamic model for vapor-liquid phase equilibrium in the exerted magnetic field was derived theoretically, based on the fundamental thermodynamic theory. The results show that the logarithm value of the ratio of the composition of the certain component in a magnetic field to that without the magnetic field is proportional to the magnetic susceptibility of the solution, and to the square of magnetic field intensity. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

In this essay, the atmosphere environmental quality assessment of Guiyang was set as an example. A RBF model of the time series of API was built to fit and evaluate urban API on the basis of the concentration of 、 and inhalable particulate matter(PM10) in atmosphere. A CCRBF model used to test and predict atmosphere environmental quality was proposed by coupling canonical correlation analysis and RBF neural network based on various factors influencing urban atmosphere environmental quality. The analysis showed that the CCRBF simplified the quantity of factors effectively and was of higher fitting and prediction accuracies than regression model.

Heat generation and heat transfer of motorized spindle unit are studied in this paper, including heat generation of built-in motor and rolling bearings, heat conduction, convection and radiation between spindle components. By modeling a FEM model of a high performance motorized grinding spindle, thermal characteristics simulation of the spindle unit is completed. The thermal characteristics under different spindle speeds, different cooling water flow rates and different forced air flow rates are simulated. The numerical results show that spindle speed and cooling water flow rate have significant influences on thermal characteristics of motorized spindle unit. These results are useful to guide the design and verification of motorized spindle unit.

Silk hydrogels have mechanical properties and structural features that are similar to load-bearing soft tissues, and can be implanted for tissue restoration. In the present study, we investigate silk fibroin sol-gel transition processes in detail. The effect of different surfactants and high temperature pretreatment were studied detailedly. Based on the study, a mechanism was summarized. The result showed that the surfactant accelerated sol-gel transitions while heat pretreatment decelerated sol-gel transitions. Gelation time was decreased to several hours when added surfactant with negative charge. On the contrary, gelation time was increased to dozens of days when extended the time of high-temperature processing. Upon gelation, a random coil structure of the silk fibroin was transformed into a β-sheet structure.

The transparent water-insoluble silk fibroin(SF) films were casted from the mixture solution of silk fibroin and xylitol/mannitol. The structure, surface morphology, solubility, mechanical properties and light transmittance of the blend films were measured. FT-IR, X-ray diffraction retuslts indicated that the films were mainly composed of Silk I structure. SEM showed the blend films with xylitol were miscible, whereas the blend films with mannitol had phase-separated structure. There were lots of nanopores in the blend films in the wet state. The insoluble SF /xylitol films had excellent mechanical properties while the SF / mannitol films were brittle. The mechanical property of SF/alcohol blend films were consistent with the human cornea in wet state.When the contents of xylitol were 10% and 20%, the blend films had high light transmittance which were similar to human cornea. In summary, the SF /xylitol film containing 10% xylitol provides a great potential to act as repairing materials for cornea.

The aim of the present work was to study the effect of properties of ion exchange membrane on separation performance of electrodeionization (EDI) process for removal of nickel ions from dilute heavy metal solutions. It was shown that the properties of ion exchange membrane had a significant effect on removal of nickel ions. With feed water containing nickel ions at the concentration of 55mg•L-1, the nickel ions concentration of dilute stream was lower than 0.5mg•L-1and the nickel rejection was greater than 99% when using EDI membranes, while that was in the range of 2.48-3.55mg•L-1with conventional heterogeneous ion exchange membranes. With optimum ion exchange material and operating conditions, EDI would be a very interesting and innovative technology for the treatment of dilute heavy metal solutions.