Abstract Siphon-shaft spillways can discharge large amounts of water down to the crest level in a narrow reservoir thanks siphonic pressures. However, cavitational pressures siphon-shaft limit operating head these spillways. An enlargement at shaft mouth reduce vacuum and velocities within flows, thereby removing risk cavitation occurring. In this study, four different enlarging profiles with v...

Micro-Doppler is regarded as a unique signature of target with micro-motions. The sophisticated recognition the cone-shaped targets can be realized through micro-Doppler effect. However, it difficult to extract micro-motion features perpendicular radar line sight (LOS) effectively. In this paper, parameters extraction method put forward based on rotating antenna. First, new configuration propos...

Anti-coning brake discs are known for their superior NVH characteristics when compared to other disc designs, but also poorer heat dissipation. Cooling of such a design studied numerically and experimentally on specially developed Thermal Spin Rig. The is installed inboard high-performance off-road vehicle, with portal axles wheel drives, resulting in nearly fourfold higher rotational speeds co...

The Bozhong oilfield (Hereinafter referred to as BZ oilfield) is a typical representative of complex fluvial reservoirs in the Bohai Sea, located southern with an average porosity 30.3% and permeability 643 × 10-3 μm2, belonging medium high reservoir, reservoir has good connectivity, underground crude oil viscosity 5 mPa·s. There are many plane fault blocks, longitudinal well section long, so o...

Intelligent mining is the demand and inevitable development direction of China’s coal industry, shearer attitude based on 3D spatial scale essential basic information for realizing intelligent at fully mechanized face. The traditional monitoring technology cannot meet accuracy requirements sensing equipment an working In this paper, principle strapdown inertial navigation system (SINS), a real-...