High Quality Content by WIKIPEDIA articles! Photolithography (or "optical lithography") is a process used in microfabrication to selectively remove parts of a thin film or the bulk of a substrate. It uses light to transfer a geometric pattern from a photomask to a light-sensitive chemical "photoresist", or simply "resist," on the substrate. A series of chemical treatments then either engraves the exposure pattern into, or enables deposition of a new material in the desired pattern upon, the material underneath the photo resist. For example, in complex integrated circuits, a modern CMOS wafer will go through the photolithographic cycle up to 50 times.
High Quality Content by WIKIPEDIA articles! Photoconductivity is an optical and electrical phenomenon in which a material becomes more electrically conductive due to the absorption of electromagnetic radiation such as visible light, ultraviolet light, infrared light, or gamma radiation.
High Quality Content by WIKIPEDIA articles! Phyllis Morris (born October 19, 1925 in Chicago, Illinois; died September 5, 1988 in Los Angeles, California) was an American furniture designer known for her colorful persona, her outspokenness on decorating and her distinctive furniture and interior designs, especially her large and highly decorative beds. She was often referred to by the media as the "designer to the stars." By the time of her death, Morris had left a mark in the world of interior design in each of the four decades since the founding of her company Phyllis Morris Originals in 1953.
High Quality Content by WIKIPEDIA articles! Physics of Failure is a technique under the practice of Design for Reliability that leverages the knowledge and understanding of the processes and mechanisms that induce failure to predict reliability and improve product performance.
High Quality Content by WIKIPEDIA articles! Picosecond ultrasonics is a type of ultrasonics that uses ultra-high frequency ultrasound generated by ultrashort light pulses. It is a non-destructive technique in which picosecond acoustic pulses penetrate into thin films or nanostructures to reveal internal features such as film thickness as well as cracks, delaminations and voids. It can also be used to probe liquids. The technique is also referred to as picosecond laser ultrasonics or laser picosecond acoustics.
В брошюре помещены таблицы, содержащие данные о насыпном, объемном и удельном весе различных строительных материалов, а также материалов, являющихся нагрузками в строительных конструкциях. Брошюра предназначена для инженерно-технических работников проектных и строительных организаций, а также для работников транспорта и складского хозяйства. Воспроизведено в оригинальной авторской орфографии...
High Quality Content by WIKIPEDIA articles! A pier is a raised structure, including bridge and building supports and walkways, over water, typically supported by widely spread piles or pillars. The lighter structure of a pier allows tides and currents to flow almost unhindered, whereas the more solid foundations of a quay or the closely spaced piles of a wharf can act as a breakwater, and are consequently more liable to silting. Piers can range in size and complexity from a simple lightweight wooden structure to major structures extended over a mile out to sea. In American English, pier may be synonymous with dock.
High Quality Content by WIKIPEDIA articles! The Pier Head is a riverside location in the city centre of Liverpool, England. It is part of the Liverpool Maritime Mercantile City UNESCO World Heritage Site, which was inscribed in 2004.
High Quality Content by WIKIPEDIA articles! Pietra dura or pietre dure (see below), called parchin kari in South Asia, is a term for the technique of using cut and fitted, highly-polished colored stones to create images. It is considered a decorative art. The stonework, after the work is assembled loosely, is glued stone-by-stone to a substrate after having previously been "sliced and cut in different shape sections; and then assembled together so precisely that the contact between each section was practically invisible". Stability was achieved by grooving the undersides of the stones so that they interlocked, rather like a jigsaw puzzle, with everything held tautly in place by an encircling `frame`. Many different colored stones,...
High Quality Content by WIKIPEDIA articles! A pile driver is a mechanical device used to drive piles into soil to provide foundation support for buildings or other structures. The term is also used in reference to members of the construction crew that work with pile-driving rigs.
High Quality Content by WIKIPEDIA articles! Pine Flat Dam is a concrete gravity dam on the Kings River of central California in the United States. Situated about 20 miles (32 km) east of Fresno, the dam is 440 feet (130 m) high and impounds Pine Flat Lake, one of the largest reservoirs in California, in the foothills of the Sierra Nevada just outside the boundary of Kings Canyon National Park. The dam`s primary purpose is flood control, with irrigation, power generation and recreation secondary in importance.
High Quality Content by WIKIPEDIA articles! A pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow — liquids and gases (fluids), slurries, powders, masses of small solids. It can also be used for structural applications; hollow pipe is far stiffer per unit weight than solid members.
High Quality Content by WIKIPEDIA articles! A pipefitter (also called steamfitter) is a tradesman who lays out, assembles, fabricates, maintains and repairs mechanical piping systems. Pipefitters usually go through a mix of apprentice and trade school training. Journeyman pipefitters/steamfitters deal with industrial process piping and heating/cooling systems. Typical industrial process pipe is under high pressure, which requires metals such as carbon steel, stainless steel, and many different alloy metals fused together through precisely cutting, threading, grooving, bending and welding, whereas a plumber concentrates on piping systems for heating/cooling as well as utility liquids potable water, sewage, drains, etc. in the...