progressive collapse is defined as the spread of an initial failure from element to element, eventually resulting in the collapse of an entire structure or a disproportionately large part of it. the current progressive collapse analyses and design methods in guidelines and codes focus on the alternate load path method. this method is suitable especially in the case of blast-induced progressive ...

Casing deformation caused by fault and fracture sliding derived from fracturing has attracted growing attention. frequently occurs during the hydraulic process in Sichuan Basin. Although its mechanism been intensively studied, this issue is becoming increasingly severe demands immediate solutions, especially shale gas blocks of Changning-Weiyuan-Zhaotong. The present study summarizes analyzes r...

The article provides an analytical review and analysis of stresses deformations parts moving at high speeds in a liquid or gas. working conditions materials turbines (blades, rotor casing) operating temperatures loads are analyzed. main ways solving the problem ensuring strength such presented. to solve reliability product as whole given: mathematical modeling (calculated determination strength...

• Ultra-high temperature geothermal wells can substantially increase the energy yield Tensile tests of traditional and potentially new casing materials are conducted The mechanical properties extend existing literature data is one needed step in constructing reliable ultra-high (>450 °C) have a large potential for increased as compared to conventional high-temperature (200-300 °C), but several ...

Purpose. To increase the stability of wellbore during its construction in unstable rocks. Methodology. solve set tasks, an integrated approach is used work, which includes critical analysis and generalization scientific technical achievements combination with theoretical experimental research. Findings. Factors influencing borehole walls conditions prone to rock slides falls are analyzed. Exped...

Progressive collapse is a kind of failure in which whole or large part of a structure collapse when a local damage occurs and distributes to other parts. Many researchers focus on the column removal analysis and study of the structure behavior under effect of gravity loads, so these investigations are mostly carried out on the tall building. Earthquake inspections indicate structural element ca...

Background: Several multiphase flow analyses have been developed to predict the fate of particles used in inhalation drug delivery; however, the collapse of droplets during their passage through respiratory tract has not been investigated. Objective: To assess the probability of droplet collapse in the upper respiratory tract.Methods: A 3D model of mouth-to-second generation airway after the tr...

Investigation of the effect of using nanomaterials for improving and Stabilizing the gypseous soil was carried out using laboratory works. The gypseous soils were collected from a site of intake in Bahar Al-Najaf and mixed with two types of nanomaterials (Nano-silica and, Nano-clay) where the nanomaterials were added in small amounts as a percent of the dry weight of the soil sample. Tests to d...

in recent years, the trend in solving optimization problems has been directed toward using heuristic algorithms such as neural networks, genetic and ant colony algorithms. the main reason for this trend can be attributed to the fact that these algorithms can be efficiently adjusted to the specific search space to which they are applied and consequently they can be used for many optimization pro...