Category: Engineering

What is coefficient of performance of a refrigeration cycle? The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work required. Higher COPs equate to lower operating costs. Less work is required to move heat than […]

How does the Internet work in simple terms? The Internet has one very simple job: to move computerized information (known as data) from one place to another. That’s it! The machines that make up the Internet treat all the information they handle in exactly the same way. In this respect, the Internet works a bit […]

What is the coordination number of strontium in the perovskite structure? 12 What is perovskite crystal structure? A perovskite is any material with a crystal structure similar to the mineral called perovskite, which consists of calcium titanium oxide (CaTiO3). The ideal cubic structure has the B cation in 6-fold coordination, surrounded by an octahedron of […]

What are fuel cell write cathode and anode reaction in a fuel cell? Cell reactions in a fuel cell: Oxidation at the anode (-): Oxidation of hydrogen gas to water occurs at the anode. 2H2(g) + 4OH-(aq) →4H2O(l) + 4e- Reduction at the cathode (+): Reduction of oxygen gas to OH ions occurs at the […]

What is the physical meaning of a stiffness matrix to be singular? A stiffness matrix that describes the deformation of an elastic body will in general be singular. Because any simple translation has no impact on the stored energy of deformation. As well, a simple rotation will also leave the energy unchanged. Why is a […]

What is the Lesch-Nyhan syndrome? Lesch-Nyhan syndrome is inherited as an X-linked recessive genetic disorder that, with rare female exceptions, most often affects males. The symptoms of Lesch-Nyhan syndrome include impaired kidney function, acute gouty arthritis, and self-mutilating behaviors such as lip and finger biting and/or head banging. What causes Lesch-Nyhan? Lesch-Nyhan syndrome (LNS) is […]

How big is a 2.5 MW wind turbine? Size Specifications of Popular Wind Turbine Models model capacity blade length* GE 1.5s 1.5 MW 35.25 m (116 ft) GE 2.3 2.3 MW 47 m (154 ft) GE 2.5 2.5 MW 44 m (144 ft) GE 2.7 2.7 MW 42 m (138 ft) How big is a […]

What is insulated runner mold? Insulated runners are oversized passages formed in the mold plate. As shown in the following diagram, the oversized passages allow an open, molten flow path to be maintained because of the insulating effect of the plastic that freezes on the runner wall, combined with the heat applied to the system […]

How do you apply a defined name to an existing formula? How to apply Excel names to existing formulas Select one or more formula cells that you want to update. Go to the Formulas tab > Define Names group, and click Define Name > Apply Names… In the Apply Names dialog box, click on the […]

Why is the Supreme Court insulated from public opinion? Since Justices do not have to run or campaign for re-election, they are thought to be insulated from political pressure when deciding cases. The Court also has original jurisdiction in cases involving ambassadors and other diplomats, and in cases between states. How does public opinion affect […]