Although the friction characteristics under different contact conditions have been extensively studied, the mechanism of phonon transport at the structural lubrication interface is not extremely clear. In this paper, we firstly promulgate that there is a 90°-symmetry of friction force depending on rotation angle at Si/Si interface, which is independent of normal load and temperature. It is further found that the interfacial temperature difference under incommensurate contacts is much larger than that in commensurate cases, which can be attributed to the larger interfacial thermal resistance (ITR). The lower ITR brings greater energy dissipation in commensurate sliding, and the reason for that is more effective energy dissipation channels between the friction surfaces, making it easier for the excited phonons at the washboard frequency and its harmonics to transfer through the interface. Nevertheless, the vibrational frequencies of the interfacial atoms between the tip and substrate during the friction process do not match in incommensurate cases, and there is no effective energy transfer channel, thus presenting the higher ITR and lower friction. Eventually, the number of excited phonons on contact surfaces reveals the amount of frictional energy dissipation in different contact states.

No abstract

For expediently integrating service partners and software modules to enhance the openness and service level of the manufacturing integrated service platform, the browser/server/database architecture is presented as its software architecture, on this basis, its function structure is divided into preponderant manufacturing resource sharing system, intelligentized and independent design system for the industry, virtual design and manufacture center, electronic business and logistics service system etc, some of these modules are emphatically described. And based on SOA service model and Web Service architecture, integrated service implementation model of manufacturing integrated service platform is established. This solution has effectively integrated hardware and software, service providers, service consumers, service supporters and function modules of the platform. So the thirdparty operators can provide manufacturing enterprises with many integrated services, example for innovative design and manufacture of key products, merchandise catalogue services, security and authentication services, electronic payment services, logistics information services, sharing and utilizing of preponderant manufacturing resources. It is easily learning, using and extending in the future, and breaks through the traditional service mode which is based on information delivery model.

No abstract

No abstract