The point at which the inlet valve closes and stops the entry of steam into the cylinder from the boiler plays a crucial role in the control of a steam engine. Once the valve has closed, steam trapped in the cylinder expands adiabatically. The steam pressure drops as it expands. A late cutoff delivers full steam pressure to move the piston through its entire stroke, for maximum start-up forces. But, since there will still be unexploited pressure in the cylinder at the end of the stroke, this is achieved at the expense of engine efficiency. In this situation the steam will still have considerable pressure remaining when it is exhausted resulting in the characteristic “chuff chuff” sound of a steam engine. An early cutoff has greater thermodynamic efficiency but results in a lower Mean effective pressure so less average force on the piston and is used for running the engine at higher speeds. The steam engine is the only thermodynamic engine design that can provide its maximum torque at zero revolutions per minute.
Many electrical components such as capacitors, resistors, and inductors have only two leads where some integrated circuits (ICs) can have several hundred leads to more than a thousand for the largest BGA devices. IC pins often either bend under the package body like a letter "J" (J-lead) or come out, down, and form a flat foot for securing to the board (S-lead or gull-lead).
However, unlike next generation optical biometry devices, ultrasound devices require direct contact of the probe, which lead to many eye infections ... lead to post-operative errors fuelling demand for next generation optical biometry devices instead of ultrasound biometry devices.
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The value marketers want from influencers is not related to how many followers they have, but rather a case of how much influence they can generate and how that can lead to sales ... of others and eventually the value of the views that they can generate organically for that content.
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Daniel Andrews has vowed to overhaul Victoria’s child protection system, saying too many First Nations children are being taken away from their families by the state ... I think we can lead the nation.”. Victoria’s child protection system is creating ‘new stolen generation’, Aboriginal leader says. Read more ... It’s not their issue. It’s the system ... .
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Image credit. Fan Wang / MIT...Wang and her colleagues found that this whisker movement alters the way mice respond to bothersome heat or a poke on the face — both of which usually lead to face rubbing. “When the unpleasant stimuli were applied in the presence of their self-generated vibrotactile whisking they respond much less,” she says ... Source. ....
The Benedict Oramah-led bank stressed that it plans to buy shares in Geregu Power Plc, a leading power-generation company majority owned by Nigerian billionaire Femi Otedola... The move, announced on the Nigerian Exchange (NGX) at t.ge weekend, comes nearly two months after the Otedola-led power-generating company successfully listed its shares.
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