flow chart of nitrification in the deep ocean aphotic zone and ammonium regeneration in the upper ocean surface photic zone . nitrogen cycle edit viral shunt is a big component to the cycling of nitrogen in marine environments.
the product flow diagram pfd representation of the order by which a sequence of products is created according to product based planning principles. it is related to the product breakdown structure pbs . it is a prescribed activity of the prince2 project management methodology which mandates the use of product based planning.
process window index pwi is a statistical measure that quantifies the robustness of a manufacturing process, e.g. one which involves heating and cooling, known as a thermal process. in manufacturing industry, pwi values are used to calibrate the heating and cooling of soldering jobs known as a thermal profile while baked in a reflow oven.. pwi measures how well a process fits into a user .
low w/c ratios and the use of silica fume make concrete mixes significantly less workable, which is particularly likely to be a problem in high-strength concrete applications where dense rebar cages are likely to be used. to compensate for the reduced workability, superplasticizers are commonly added to high-strength mixtures. aggregate must be .
the bayer process is the principal industrial means of refining bauxite to produce alumina and was developed by carl josef bayer. bauxite, the most important ore of aluminium, contains only 30–60% aluminium oxide, the rest being a mixture of silica, various iron oxides, and titanium dioxide. the aluminium oxide must be purified before it can be refined to aluminium metal.
aluminum aluminium in british english electrolytic capacitors are polarized electrolytic capacitors whose anode electrode is made of a pure aluminum foil with an etched surface. the aluminum forms a very thin insulating layer of aluminium oxide by anodization that acts as the dielectric of the capacitor. a non-solid electrolyte covers the rough surface of the oxide layer, serving in .
aerogel production. supercritical carbon dioxide is used in the production of silica, carbon and metal based aerogels. for example, silicon dioxide gel is formed and then exposed to s co 2. when the co 2 goes supercritical, all surface tension is removed, allowing the liquid to leave the aerogel and produce nanometer sized pores.
newspaper production process. newspaper 1 circular reference production is an act that actually starts from the gathering of news stories, articles, opinions, advertorials and advertisements to printing and folding of the so called “hard copy”.
for example, in tidal flow meters, where seawater attack is a problem, or in electric field seekers. si 3 n 4 was first demonstrated as a superior bearing in 1972 but did not reach production until nearly 1990 because of challenges associated with reducing the cost. since 1990, the cost has been reduced substantially as production volume has .
silica is a common additive in food production, where it is used primarily as a flow agent in powdered foods, or to adsorb water in hygroscopic applications. it is used as an anti-caking agent in powdered foods such as spices and non-dairy coffee creamer. it is the primary component of diatomaceous earth.
six sigma 6σ is a set of techniques and tools for process improvement.it was introduced by american engineer bill smith while working at motorola in 1980. jack welch made it central to his business strategy at general electric in 1995. a six sigma process is one in which 99.99966% of all opportunities to produce some feature of a part are statistically expected to be free of defects.
an oil production plant is a facility which processes production fluids from oil wells in order to separate out key components and prepare them for export. this is distinct from an oil depot, which does not have processing facilities. typical oil well production fluids are a mixture of oil, gas and produced water.
the speed or velocity of the water flow of the water column can also vary within a system and is subject to chaotic turbulence, though water velocity tends to be highest in the middle part of the stream channel known as the thalveg . this turbulence results in divergences of flow from the mean downslope flow vector as typified by eddy currents.
continuous-flow manufacturing, or repetitive-flow manufacturing, is an approach to discrete manufacturing that contrasts with batch production.it is associated with a just-in-time and kanban production approach, and calls for an ongoing examination and improvement efforts which ultimately requires integration of all elements of the production system. . the goal is an optimally balanced .
solvay process. the solvay process or ammonia-soda process is the major industrial process for the production of sodium carbonate soda ash, na 2co 3 . the ammonia-soda process was developed into its modern form by ernest solvay during the 1860s.
hydrated silica is a form of silicon dioxide, which has a variable amount of water in the formula. when dissolved in water it is usually known as silicic acid. it is found in nature, as opal which has been mined as a gemstone for centuries , and in the cell walls of diatoms.
in operations management and industrial engineering, production flow analysis refers to methods which share the following characteristics: . classification of machines; technological cycles information control; generating a binary product-machines matrix 1 if a given product requires processing in a given machine, 0 otherwise