The effective measuring range of an electromagnetic wave resistivity instrument used in logging while drilling (LWD) is small, and the measurement greatly influenced by dielectric constant, especially high-dielectric-constant formations. In this paper, response characteristics under a high constant are investigated numerical simulation algorithm, conversion method determined. results show that ...

Abstract The occurrence of strong and abrupt rainfall, together with a wrong land use planning an uncontrolled urban development, can constitute risk for infrastructure population. water flow in the subsoil, under certain conditions, may cause underground cavities formation. This phenomena known as soil piping evolve generate surface collapse. It is clear that such densely urbanized areas repre...

Concrete surface resistivity can be measured non-destructively, providing an indirect measurement of microstructural development which related to strength development. However, relating and challenging for limestone calcined clay cements (LC3) since they contain mineral components varying composition reactivity. In this study LC3 formulations, concrete until 56 days hydration mortar compressive...

Abstract During the conventional petrophysical interpretation fixed (predefined) zone parameters are applied for every (depth intervals). Their inclusion in inversion process requires extension of a likelihood function whole zone. This allows to define extremum problem fitting parameter set full interval model layers crossed by well, both associated with depth points (e.g. porosity, saturations...

This study examined the psychometric properties of the short version of the ERI (Effort-Reward Imbalance) questionnaire with a total of 395 high school teachers (50.1% male, 49.9% female). The reliability of the questionnaire was obtained by an analysis of internal consistency, the validity of the instrument by Exploratory Factor Analysis and construct by CFA (Confirmatory Factor Analysis). Fin...

saltwater intrusion into freshwater in coastal areas has been a serious concern for many countries. providing fresh water in some regions is very crucial. in fact, the areas that  are prone to encountering salt water zones should be checked meticulously. the preferred method for such investigation is a precise 3-d model of distribution of fresh and salt water in order to reach such a model, rel...

Different mineral admixtures of Indian metakaolin, Iranian silica fume and nanosilica were used to produce high performance mortars. Two different sands types with grain size of 0.015-4mm were mixed with type II Portland cement, polycarboxylate superplasticizer,mineral admixture with 650kg/m3 cement content and water/cement ratio of 0.35. Different amount of cement was replaced by metakaolin or...

Electrical resistivity describes how much a certain material resists electrical flow. Every material has an associated resistivity, ρ, which is constant. Conductors, such as copper have a low resistivity, while insulators, such as glass, have a high resistivity. Resistivity is an important property of any electrical object because it directly relates to the resistance, which relates to Ohm’s la...

Magnetic island equilibria resulting from reconnection in magnetohydrodynamic (MHD) simulations are explored in a two-dimensional slab geometry. Magnetic islands are evolved to finite amplitude with a nonzero resistivity. The resistivity and flows are then set to zero and the system is allowed to relax toward equilibrium. A y-type singular current layer in the equilibrium state is identified fo...

A many-body coherent potential approximation (CPA) previously developed for the double exchange (DE) model is extended to include coupling to local quantum phonons. The Holstein-DE model studied (equal to the Holstein model for zero Hund coupling) is considered to be a simple model for the colossal magnetoresistance manganites. We concentrate on eeects due to the quantisation of the phonons, su...