The role of various long-wave approximations in the description wave field and bottom pressure caused by surface waves, their relation to evolution equations are being considered. In framework linear theory, these tested on well-known exact solution for spectral amplitudes variations. famous Whitham, Korteweg–de Vries (KdV) Benjamin–Bona–Mahony (BBM) have been used as evolutionary equations. It...

This paper presents main results of a shale stability study, related to the understanding of shale/ fluid interaction mechanisms, and discusses shale strength correlation. The major shale/ fluid interaction mechanisms: Capillary, osmosis, hydraulic, swelling and pressure diffusion, and recent experimental results are discussed. Factors affecting the shale strength are discussed, and a sonic com...

The effect of hydrostatic pressure up to 2 GPa on the superconductiong transitions in La 2−x Sr x CuO 4+δ is investigated. The ambient and high pressure properties of two series of samples with x=0 and x=0.015 and 0< δ <0.1 are characterized and compared by ac-susceptibility measurements. At ambient pressure both sets of samples fit into the same phase diagram as a function of the total hole co...

Tsunamis are often generated by a moving sea bottom. This paper deals with the case where the tsunami source is an earthquake. The linearized water-wave equations are solved analytically for various sea bottom motions. Numerical results based on the analytical solutions are shown for the free-surface profiles, the horizontal and vertical velocities as well as the bottom pressure.

The optimization of injection–production parameters is an important step in the design gas injection development schemes, but there are many influencing factors and they difficult to determine. To solve this problem, paper optimizes injection-production by combining improved particle swarm algorithm study relationship between net present value. In process parameter optimization, has shortcoming...

The German-Indonesian Tsunami Early Warning System (GITEWS) aims at reducing the risks posed by events such as the 26 December 2004 Indian Ocean tsunami. To minimize the lead time for tsunami alerts, to avoid false alarms, and to accurately predict tsunami wave heights, realtime observations of ocean bottom pressure from the deep ocean are required. As part of the GITEWS infrastructure, the par...