Climatic warming and permafrost thaw are predicted to increase Arctic riverbank erosion, threatening communities accelerating sediment, carbon nutrient cycling between rivers floodplains. Existing theory assumes that pore-ice sets erosion rates, but overpredicts observed rates by orders of magnitude. Here, we developed a simple model predicts more modest due sediment-entrainment limitation armo...

In this study, a hybrid optimization XGBoost model was used to predict the slump of concrete. This combines grid search and particle swarm (PSO) algorithm. The is determine maximum depth number trees in XGBoost, while optimizes other floating-point hyperparameter ranges improve predictive accuracy model. factors influencing concrete include water, cement, fine aggregate, coarse water reducer, w...

The Papua New Guinea (PNG) tsunami of July 1998 was a seminal event because it demonstrated that relatively small and relatively deepwater Submarine Mass Failures (SMFs) can cause devastating local tsunamis that strike without warning. There is a comprehensive data set that proves this event was caused by a submarine slump. Yet, the source of the tsunami has remained controversial. This controv...

Dissolved methane and high resolution bathymetry surveys were conducted over the Rock Garden region of Ritchie Ridge, along the Hikurangi margin, eastern New Zealand. Multibeam bathymetry reveals two prominent, northeast trending ridges, parallel to subduction along the margin, that are steep sided and extensively slumped. Elevated concentrations of methane (up to 10 nM, 10× background) within ...

Accurate prediction of fresh concrete slumps is a complex non-linear problem that depends on several parameters including time, temperature, and shear history. It also affected by the mixture design various ingredients. This study investigates efficiency three novel integrative approaches for predicting this parameter. To end, vortex search algorithm (VSA), multi-verse optimizer (MVO), shuffled...

Spontaneous intracranial hypotension, of which brain slump is an extreme expression, is caused by a cerebrospinal fluid leak. The reason the leak develops in the first place, however, is unknown, and some cases can be very difficult to manage. We describe a patient with severe symptoms of spontaneous intracranial hypotension and brain slump documented by magnetic resonance imaging whose clinica...

Adequate selection of material constituents and test methods are necessary for workability specifications and performance of hardened concrete. An experimental program was performed to evaluate the suitability of various test methods for workability assessment and to propose performance specifications of prestressed concrete. In total, 33 self-consolidating concrete (SCC) mixtures made with var...

One of the leading schools in modern unemployment theory is the "Structuralist" theory of the "natural" or equilibrium rate of unemployment (NRU) started by Edmund S. Phelps (see Blanchard 2000, p. 255; Phelps 1994, 2005b; Fitoussi et al. 2000; Phelps and Zoega 2004). In fact, it can be understood as a kind of meta-theory of unemployment (Phelps 2002). In a nutshell, Structuralist theory postul...

Abstract In this paper, the effects of three kinds steel fibers with different aspect ratios on slump, compressive intensity, and splitting tensile strength concrete were studied. The results show that slump for fiber-based polished reduces amount admixture foundation. larger length diameter is reduced at same volume admixture. intensity cleavage mixed are increased to degrees than vegetal one....