The relationships between the microstructure, the composition, the friction temperature and the form of a new kind of friction material which is a glass fibre resin friction materials (GFRF) are studied through a seri...The relationships between the microstructure, the composition, the friction temperature and the form of a new kind of friction material which is a glass fibre resin friction materials (GFRF) are studied through a series of tests on machine as EPMA, STM, DTG-DTA,an optical microscope and a friction test machine. The tests show that the rising rate in temperature and the heat conductivity of GFRF are lower than that of asbestos friction material. In GFRF, the heat-decline is slowed down or even eliminated. the distribution of heat- stress is improved and the life span is extended. Raising the temperature of resin resolution and enhancing the stickness between resin and glass fibre are the two important procedures to improve the friction and wear performance of GFRF.A discription about the friction and wear mechanism of GFRF is given in this paper.展开更多
In this paper,we discuss the oscillatory behavior of a class of nonlinear neutral perturbed dynamic equations on time scales.Some new oscillation criteria are obtained for such dynamic equations.Finally,an example tha...In this paper,we discuss the oscillatory behavior of a class of nonlinear neutral perturbed dynamic equations on time scales.Some new oscillation criteria are obtained for such dynamic equations.Finally,an example that dwells upon the sharp conditions of our result is also included.展开更多
By introducing two integral operators and using the integral averaging technique,some new oscillation criteria are obtained for a class of high order neutral differential equation with continuous deviating arguments.T...By introducing two integral operators and using the integral averaging technique,some new oscillation criteria are obtained for a class of high order neutral differential equation with continuous deviating arguments.These results are different from most known ones in the sense that they depend on the information only on a sequence of subintervals of[t0,∞),rather than on the whole half-line.展开更多
文摘The relationships between the microstructure, the composition, the friction temperature and the form of a new kind of friction material which is a glass fibre resin friction materials (GFRF) are studied through a series of tests on machine as EPMA, STM, DTG-DTA,an optical microscope and a friction test machine. The tests show that the rising rate in temperature and the heat conductivity of GFRF are lower than that of asbestos friction material. In GFRF, the heat-decline is slowed down or even eliminated. the distribution of heat- stress is improved and the life span is extended. Raising the temperature of resin resolution and enhancing the stickness between resin and glass fibre are the two important procedures to improve the friction and wear performance of GFRF.A discription about the friction and wear mechanism of GFRF is given in this paper.
基金Supported by the NNSF of China(11161049)the SF of the Zhangjiakou Bureau of Science and Technology(1112027B-1)
文摘In this paper,we discuss the oscillatory behavior of a class of nonlinear neutral perturbed dynamic equations on time scales.Some new oscillation criteria are obtained for such dynamic equations.Finally,an example that dwells upon the sharp conditions of our result is also included.
基金Supported by the NSF of Hebei Province and the NSF of Hebei Institute of Architecture and Civil Engineering.
文摘By introducing two integral operators and using the integral averaging technique,some new oscillation criteria are obtained for a class of high order neutral differential equation with continuous deviating arguments.These results are different from most known ones in the sense that they depend on the information only on a sequence of subintervals of[t0,∞),rather than on the whole half-line.
