the vibrations produced by trains include two parts which are deterministic and random vibrations. due to variation of dynamic loads and patterns of load-time, the random vibration of moving train is one of the most important issues in the field of railway engineering. one of the important sources in producing the train vibrations is rail roughness and irregularities. in this paper, responses o...

A combination of exponential and half logistic failure rate model for reliability studies is paid much attention. An attempt is made to present the distributional properties, estimation of parameters , testing of hypothesis and the power of likelihood ratio criterion about the proposed model .

We consider the extended Hubbard model on a two-dimensional square lattice at half-filling. The is investigated using strong coupling diagram technique. sum infinite series of ladder diagrams allowing for full-scale charge and spin fluctuations actual short-range antiferromagnetic order nonzero temperatures. In agreement with earlier results, we find first-order phase transition in subsystem oc...