systemy-bezpieczenstwa: Concrete

Evidence: 100 • authority: 72

Concrete is a composite material composed of aggregate bound together with a fluid cement that cures to a solid. It is the second-most-used substance (after water), the most widely used building material, and the most-manufactured material in the world. Cement-bound concrete differs from the less rigid, less durable asphaltic concrete, which has a bituminous binder. When aggregate is mixed with dry Portland cement and water, the mixture forms a fluid slurry that can be poured and molded into shape. The cement reacts with the water through a process called hydration, which hardens it after several hours to form a solid matrix that binds the materials together into a durable stone-like materi…

Evidence: 54 • authority: 72

The mind is that which thinks, feels, perceives, imagines, remembers, and wills. It covers the totality of mental phenomena, including both conscious processes, through which an individual is aware of external and internal circumstances, and unconscious processes, which can influence an individual without intention or awareness. The mind plays a central role in most aspects of human life, but its exact nature is disputed. Some characterizations focus on internal aspects, saying that the mind transforms information and is not directly accessible to outside observers. Others stress its relation to outward conduct, understanding mental phenomena as dispositions to engage in observable behavior…

Evidence: 54 • authority: 92

Musical Emotion Modulates Concrete and Abstract Word Processing: Evidence from ERPs.. Background/Objectives: Cross-modal emotional priming effects of music on language have been widely demonstrated, but how musical emotion interacts with different types of conceptual representation remains unclear. This study examined whether emotional musical contexts exert differential influences on the processing of concrete and abstract words, whose processing is thought to depend to different degrees on sensorimotor and affective experience. Methods: Two ERP experiments were conducted using a long stimulus-onset asynchrony priming paradigm with two independent groups of participants. In Experiment 1, 2…

Evidence: 54 • authority: 72

A cement is a binder used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel (aggregate) together. Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. Concrete is the most widely used material in existence and is behind only water as the planet's most-consumed resource. Cements used in construction are usually inorganic, often lime- or calcium silicate-based, and are either hydraulic or less commonly non-hydraulic, depending on the ability of the cement to set in the presence of water (see hydraulic and non-hydraulic lime plaster)…

Evidence: 47 • authority: 92

The re-tooled mind: how culture re-engineers cognition.. One of the main goals of cognitive science is to discover the underlying principles that characterize human cognition, but this enterprise is complicated by culturally-driven variability. While much fruitful work has focused on how culture influences the contents of cognition, here I argue that culture can in addition exercise a profound effect on the how of cognition-the mechanisms by which cognitive tasks get done. I argue that much of the fundamental processes of daily cognitive activity involve the operation of cognitive tools that are not genetically determined but instead are invented and culturally transmitted. Further, these c…

Evidence: 47 • authority: 92

Anisotropy of Mechanical Properties of 3D-Printed Materials-Influence of Application Time of Subsequent Layers.. Three-dimensional concrete printing (3DCP) is an emerging additive manufacturing technology with increasing application potential in the construction industry, offering advantages such as reduced labor requirements, shortened construction time, and material efficiency. However, structural integrity remains a challenge, particularly due to weak interlayer bonding resulting from the layered manufacturing process. This study investigates the mechanical performance and anisotropy of 3D-printed mineral-based composites with respect to the time interval between successive layers. Speci…

Evidence: 47 • authority: 72

Casting is a manufacturing process in which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process. Casting materials are usually metals or various time setting materials that cure after mixing two or more components together; examples are epoxy, concrete, plaster and clay. Casting is most often used for making complex shapes that would be otherwise difficult or uneconomical to make by other methods. Heavy equipment like machine tool beds, ships' propellers, etc. can be cast easily in the required size…

Evidence: 47 • authority: 72

Marine construction is the process of building structures in or adjacent to large bodies of water, usually the sea. These structures can be built for a variety of purposes, including transportation, energy production, and recreation. Marine construction can involve the use of a variety of building materials, predominantly steel and concrete. Some examples of marine structures include ships, offshore platforms, moorings, pipelines, cables, wharves, bridges, tunnels, breakwaters and docks. Marine construction may require diving work, but professional diving is expensive and dangerous, and may involve relatively high risk, and the types of tools and equipment that can both function underwater…

Evidence: 39 • authority: 72

Cavitation in fluid mechanics and engineering normally is the phenomenon in which the static pressure of a liquid reduces to below the liquid's vapor pressure, leading to the formation of small vapor-filled cavities in the liquid. When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate shock waves that may damage machinery. As a concrete propeller example: The pressure on the suction side of the propeller blades can be very low and when the pressure falls to that of the vapour pressure of the working liquid, cavities filled with gas vapour can form. The process of the formation of these cavities is referred to as cavitation. If the cavities…

Evidence: 39 • authority: 72

Sound design is the art and practice of creating auditory elements of media. It involves specifying, acquiring and creating audio using production techniques and equipment or software. It is employed in a variety of disciplines including filmmaking, television production, video game development, theatre, sound recording and reproduction, live performance, sound art, post-production, radio, new media and musical instrument development. Sound design commonly involves performing (see e.g. Foley) and editing of previously composed or recorded audio, such as sound effects and dialogue for the purposes of the medium, but it can also involve creating sounds from scratch through synthesizers. A sou…

Evidence: 39 • authority: 72

Reliability engineering is a sub-discipline of systems engineering that emphasizes the ability of equipment to function without failure. Reliability is defined as the probability that a product, system, or service will perform its intended function adequately for a specified period of time; or will operate in a defined environment without failure. Reliability is closely related to availability, which is typically described as the ability of a component or system to function at a specified moment or interval of time. The reliability function is theoretically defined as the probability of success. In practice, it is calculated using different techniques, and its value ranges between 0 and 1,…

Evidence: 39 • authority: 92

Effects of hue and orientation on naturalness and preference: evidence from concrete and abstract art.. Introduction In previous research, we found that visual features such as hue and orientation can modulate individuals' aesthetic preferences. Concrete art contains real world referential representations, whereas abstract art lacks specific referential information. However, it remains unclear whether this modulatory effect differs between these two categories of art. Methods The present study employed a three-factor repeated-measures design, manipulating painting category (concrete vs. abstract), hue (original vs. rotated), and orientation (upright vs. inverted), to examine the effects of…