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Tungsten coating has been electrodeposited form Na2WO4-ZnO-WO3 molten salts in an open air condition. The electro-chemical mechanism of tungsten in such molten salts has been studied by cyclic voltametry and chrono-amperometryt. It has been found that a cathode reduction peak appears at a potential of about 700 micro-volt (vs platinum quasi-reference electrode) and the outcome of iso-potential electrolysis...
In this paper, the effect of AC Corona on the hydrophobicity of room temperature vulcanizing (RTV) silicone rubber materials is studied with a pin-plate electrode corona accelerate aging model. Experiments show that AC corona can make the RTV specimen hydrophobicity lose rapidly, further, the hydrophobicity recovery character of RTV specimen is also researched through a long time of corona test, as...
According to the workpiece material, cutter material and shape, combined with the cutting data in the course of processing, the formation principle of surface roughness is studied in this paper. By calculating the cutting force in the turning process using the empirical formula in the actual production, analyzing the surface layer residual area in the cutter cutting process, abstracting the relationship...
A system was developed for real-time, in vivo investigation of the relationship between local cell-level nano-mechanical perturbation and cell response to chemical-physical biomaterial surface properties. The system consisted of a magnetoelastic (ME) layer that could be remotely set to vibrate, at submicron levels, at a predetermined amplitude and profile. Experiments result indicated that submicron...
Infrared thermography has become increasingly important for non-destructive testing to detect internal defections, involving delaminations, cracks and voids. In this paper, the principle of infrared thermography is presented briefly. And a finite element approach is proposed to simulate the process of infrared thermography nondestructive testing about QFN packages. By changing with the length and...
Rare-earth thermal diffusion technology is an emerging technology, which is based on the traditional surface engineering technology. The article briefly introduces appLications of rare-earth thermal diffusion technology in plastic injection mould cavity surface treatment and detailedly expatiates the basic processes and conditions about rare-earth thermal diffusion technology. Compared to the traditional...
Aiming at quaLity problem and influencing factors easily appearing on the surface when cutting parts using ultrasound Liquid flow, this article carried on the thorough analysis, and proposed that the surface quaLity and accuracy of parts were closely related with design process factors, consisting of parameters of cutting machine, cutting process and hydrauLic system. High-quaLity machined surface...
Characterization and measurement science lies at the core of fundamental and applied research, technology development, and commercialization in every scientific discipline. Unfortunately, the importance of the characterization process and its burden on time and money resources is often overlooked and becomes a bottleneck to technology development and commercialization[1]. The ad hoc approach to characterization...
This paper reports a study on 3D topography and tomography visualization of materials with micro and nano features. SEM stereo imaging technique is employed to characterize surfaces by reconstruction. With this technique, diatomaceous frustules and sputtering yield of metals were analyzed. X-ray nanotomography (nCT) is used for characterization of a polymer electrolyte fuel cell (PEFC) gas diffusion...
Energy-saving manufacturing of products is an important feature for the success of today's producing enterprises. Beside the marketing point of view, energy-efficiency plays a key role due to the fact that the costs for purchasing materials and energy increases. The basis of economic manufacturing are manufacturing processes taking energy- and resource-efficiency into account. Influence factors are...
This paper proposes a mathematical model of a mass-sensitive chemical sensor with a PPF-coated quartz crystal resonator (QCR) to enable its use for the signal processing of gas sensing systems that are operated under ambient conditions. To approximate the pulse-like responses of the PPF-coated QCR sensor to the sample gas and adsorbed water, a mathematical model based on the diffusion equation (under...
To extract polysaccharide of Camellia Cake, cellulase-assist method was used. The extraction conditions were: temperature 50°C; time 3h; adding amount of cellulase 0.35%. The extract rate of camellia cakes polysaccharide is 26.62%, The adequacy of this model was confirmed.
Laser surface texturing is regarded as a useful method for improving tribological property of working surface. Meanwhile, the variables of technology have undetectable effects on surface topographies, such as pulse frequency induced by the distances of pulse-acting points and the revolution speed of optic axis. Doubtlessly, laser power turns to be a complicated function of these variables, which devoted...
Solder paste plays a critical role in SMT (surface mount technology) and reflow soldering. And flux is an important material in composition of solder paste. Due to the drive towards lead-free electronic packaging and no-clean soldering technology, a new no-clean flux contained composite activators was formulated specifically for lead-free paste. Spread test was carried out to evaluate the activity...
Summarize the research status of surface nanocrystallization of metal materials, including the fundamental principle of surface nanocrystallization,its structural feature, preparation methods and functional characteristics, Surface nanocrystallization of research has extensive application prospect in the future.
In the present study, blindfolded subjects had to explore differently shaped objects with two hands and to judge their volume. The results showed a significant effect of the shape of objects on their perceived volume. Additional analysis showed that this effect could not be explained by the subjects' tendency to base the volume judgment on a specific object dimension other than the volume itself....
We designed, fabricated and tested a novel prototype neural interface using two-dimensional single-atom-thick graphene as microelectrode for neural applications. The cytotoxicity indicated a satisfactory biocompatibility and non-toxicity. The treatment graphene with steam plasma improved the biological properties. The action potentials of lateral giant (LG) nerve fiber of the escape circuit of an...
The AlSn20 coatings on bearing alloy were deposited using magnetron sputtering technology. The influence of tin target current on the microstructure, hardness, corrosion resistance, bonding force and friction coefficient were analyzed. The results show that when the tin target current are in the scope of 0.19A ∼0.25A, with the decreasing of it, the coating changes from rough structure to fine structure...
A new kind of high contrast, MEMS-based reflective display system is being developed. The system consists of light reflective flaps on an optically absorptive surface. The novelty is that the flaps are in vertical position at their rest state. They can be electrostatically turned to horizontal state. A trench refilling technique on a silicon-on-insulator (SOI) wafer is used to fabricate the torsional...
The Wenchuan earthquake has caused numerous landslides and avalanches as the sources for debris flows. A typical example is the Miancu Gully in Maoxian, where accumulates tremendous volume of loose solid materials that have formed 12 dammed lakes. Combining field surveys, Quickbird images (with spatial resolution of 0.61m) after the earthquake are used to identify the avalanches and landslides. Results...
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