Surface hardening , treatment of steel by heat or mechanical means to increase the hardness of the outer surface while the core remains relatively soft. The combination of a hard surface and a soft interior is greatly valued in modern engineering because it can withstand very high stress and fatigue, a property that is required in such items as gears and anti-friction bearings. Surface-hardened steel is also valued for its low cost and superior flexibility in manufacturing. The oldest surface-hardening method is carburizing , in which steel is placed at a high temperature for several hours in a carbonaceous environment. The carbon diffuses into the surface of the steel, rendering it harder.
Bagnall and Morris Waste Services Case Study
From Prairies to Corn Fields for Fuel - National Center for Case Study Teaching in Science (NCCSTS)
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Carbon as an Emerging Asset Class
The comparison between computers and the human brain is hard to get away from. It is often a useful analogy, but sometimes conflicts with how our brains actually work. One of the continuing questions about how our brains are similar or dissimilar to computers is how they process code. Do we process it as if it is a language or a series of math problems? This question is important for a number of reasons.
A study published in Nature Sustainability reports that indoor cannabis operations can be a significant source of carbon emissions. In just the state of Colorado, researchers estimated 2. The study quantified and analysed the greenhouse gas emissions produced by cannabis growers across several states where the plant is legally grown. Although powerful growing lights are big energy hogs, Summers was surprised to learn that the heating, ventilation, and air conditioning HVAC systems generally required the most amount of energy. Ventilation rates are far higher in grow ops than in homes — up to 60 air exchanges per hour compared to 0.