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The pebble-bed reactor ( PBR) is a design for a graphite- moderated, gas-cooled nuclear reactor. It is a type of very-high-temperature reactor (VHTR), one of the six classes of nuclear reactors in the Generation IV initiative . Graphite pebble for reactor. The basic design features spherical fuel elements called pebbles.
Phosphorus tribromide, like PCl 3 and PF 3, has both properties of a Lewis base and a Lewis acid. For example, with a Lewis acid such as boron tribromide it forms stable 1 :1 adducts such as Br 3 B · PBr 3. At the same time PBr 3 can react as an electrophile or Lewis acid in many of its reactions, for example with amines.
Physically based rendering ( PBR) is a computer graphics approach that seeks to render images in a way that models the lights and surfaces with optics in the real world. It is often referred to as "Physically Based Lighting" or "Physically Based Shading". Many PBR pipelines aim to achieve photorealism. Feasible and quick approximations of the ...
Pabst Blue Ribbon, commonly abbreviated PBR, is an American lager beer sold by Pabst Brewing Company, established in Milwaukee, Wisconsin, in 1844 and currently based in San Antonio. Originally called Best Select , and then Pabst Select , the current name comes from the blue ribbons tied around the bottle's neck between 1882 and 1916.
Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...
Ninja Creami Ice Cream Maker. $149 $199 Save $50. With seven magical frozen treat modes, and two-pint containers and lids, this appliance was already a good deal at full price, especially compared ...
5. Put your budget into action. Once you've created your 50/30/20 budget, it's time to put it into action. Here are tips to ensure you’re successful: Automate your savings and bill payments. Set ...
Performance-based regulation ( PBR) is an approach to utility regulation designed to strengthen utility performance incentives. Thus defined, the term PBR is synonymous with incentive regulation. The two most common forms of PBR are award-penalty mechanisms (“APMs”) and multiyear rate plans (“MRPs”). Both involve mathematical formulas ...