Research results on sediment vibration characteristics are scarce, and knowledge the effect of particle size response is still limited. In this study, natural pebbles different heights—A, B C—were selected (hA < hB hC). Miniature acceleration sensors were installed inside pebble. Experimental methods used to measure process rough bed surface near-bed velocities simultaneously. The test show ...

a numerical model for two-phase debris flows is developed in this paper, on the basis of understanding of the physical characteristics of debris flows from field investigations and experiments. employing a moving coordinate, the kinetic energy equation of gravel particles in unit volume in debris flow is developed by considering the potential energy of the particles, energy from the liquid phas...

  For efficiency evaluation of some of the Decision Making Units that have uncertain information, Rough Data Envelopment Analysis technique is used, which is derived from rough set theorem and Data Envelopment Analysis (DEA). In some situations rough data alter nonradially. To this end, this paper proposes additive rough–DEA model and illustrates the proposed model by a numerical example.

Understanding bed load impact dynamics on exposed bedrock in rivers is crucial to quantifying the erosive energy of a stream. Observations saltation trajectories and energies are lacking, particularly channels with nonplanar topography. In this study, we performed four flume experiments saltating gravel offer new insights dependence particle transport stage Our used two different boundary shear...

Abstract This paper presents an investigation of flow past a sphere on rough surface by means simulation using the meshless numerical method, smoothed particle hydrodynamics (SPH) in presence free surface. A representative natural and engineered objects is spherical wall-mounted bodies. These are ideal to study conditions around hydraulic structures, boulders, fish habitat structures or even ar...

Introduction Wound dressings that adhere to the wound surface can disrupt the wound bed and destroy newly formed, healthy tissue on removal, resulting in a disturbed, rough surface. This often happens with simple gauze pad. To avoid conglutination with the wound, e.g. combined fleece compresses possess a micro-porous polyester foil or impregnated gauze is used. So far, it hasn’t been studied wh...

Angular scattering properties of ice crystal particles generated in a laboratory cloud chamber are measured with a lightweight polar nephelometer with a diode laser beam. This cloud chamber produces distinct plate and hollow column ice crystal types for light-scattering experiments and provides a controlled test bed for comparison with results computed from theory. Ice clouds composed predomina...

Rough data envelopment analysis (RDEA) evaluates the performance of the decision making units (DMUs) under rough uncertainty assumption. In this paper, new discussion regarding RDEA is extended. The RSBM model is proposed by integrating SBM model and rough set theory. The process of reaching solution is presented and this model is applied to efficiency evaluation of the DMUs with uncertain ...