Errors in finite element analysis of backward erosion piping

Backward erosion piping (BEP) is a type of internal erosion responsible for the failure of many dams and levees. BEP occurs when small, shallow erosion channels progress upstream through foundation sands beneath the structure. As analysis of BEP involves coupling two different sets of flow equations to describe the groundwater flow and...

Origin and distribution of grain-coating and pore-filling chlorite in deltaic sandstones for reservoir quality assessment

Grain-coating chlorite preserves porosity and permeability through the inhibition of quartz cement whereas pore-filling chlorite blocks pore-throats and diminishes reservoir quality. The aim of this study is to determine the origin and principal mechanisms which govern the distribution of grain-coating and pore-filling chlorite in Jurassic...

Measurements and discrimination of drones and birds with a multi-frequency multistatic radar system

This article presents the results of a series of measurements of multistatic radar signatures of small UAVs at L- and X-bands. The system employed was the multistatic multiband radar system, NeXtRAD, consisting of one monostatic transmitter-receiver and two bistatic receivers. NeXtRAD is capable of recording simultaneous bistatic and...

Lutetium coating of nanoparticles by atomic layer deposition

Atomic layer deposition (ALD) is a versatile gas phase coating technique that allows coating of complex structured materials, as well as high-surface area materials such as nanoparticles. In this work, ALD is used to deposit a lutetium oxide layer on TiO₂ nanoparticles (P25) in a fluidized bed reactor to produce particles for...

Thermal atomic layer deposition of gold nanoparticles: Controlled growth and size selection for photocatalysis

Gold nanoparticles have been extensively studied for their applications in catalysis. For Au nanoparticles to be catalytically active, controlling the particle size is crucial. Here we present a low temperature (105 °C) thermal atomic layer deposition approach for depositing gold nanoparticles on TiO₂ with controlled size and...

Probabilistic Slope Stability Analysis using RFEM with Non-Stationary Random Fields

Using recently obtained deterministic results as a benchmark, probabilistic slope stability analyses have been performed on an undrained slope using the random finite element method (RFEM). Non-stationary random fields have been generated with linearly increasing mean undrained strength and a constant coefficient of variation. The influence of...

Remote web-based 3D visualization of hydrological forecasting datasets

Reliability analysis of beams on random elastic foundations

The classical problem of a beam on an elastic foundation has long been of practical interest to geotechnical engineers, because it provides a framework for computing deflections not only of foundations, but also of vertically oriented laterally loaded piles. The supporting soil can be modelled as an elastic medium, which can be calibrated to...

Oceanographic surveys with a 50-hour endurance autonomous underwater vehicle

Two fatty acid 9-desaturase genes, ole1 and ole2, from Mortierella alpina complement the yeast ole1 mutation

The British crosshead marine diesel engine between the wars

Tests on an engine installation for a slender gothic wing at M=1.82

Tests were made at M = 1·82 over an incidence range of ±10º on an engine installation mounted at the rear of an uncambered slender gothic wing with different values of the boundary layer bleed height and at various mass flow ratios. In addition an investigation was made of the flow conditions at the inboard and outboard edges of the inlet and of...