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Approximately 70 of freshwater use is allocated to agricultural irrigation.

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5mo ago

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What is memory compaction?

As a memory pool is allocated from, over time the pool will become fragmented. Some objects from the pool will be allocated surrounded by objects that are not, in seemingly random order. Memory compaction is the process of moving allocated objects together, and leaving empty space together. Consider a system with 3 pages and about 50% of their objects are allocated. By compacting all the living objects into the first two pages, leaving the third page completely empty. This empty page can then be ignored during future mark/sweep phases since it is known to be empty of living objects, or it can be released and returned to the operating system.


Tradable pollution permit?

A tradable pollution permit system is a market-based approach to controlling pollution. It involves issuing a limited number of permits that allow companies to emit a specific amount of pollution. Companies can buy and sell permits, creating a financial incentive to reduce emissions and ensuring that pollution levels stay within specified limits.


What is zero base forecasting?

This method uses the organization's current level of employment as the starting point for determining future staffing needs. The key to zero-base forecasting is a thorough analysis of human resource needs.


Do earth's magnetic field has always run from north pole to south pole?

Yes a magnet has a north pole and a south pole. Magnets generate a magnetic field that "flows" in one direction. To make it easy to understand how two magnets interact, scientists and physicists assign names of "North" and "South" to the opposite ends of the magnet. Some magnets can reverse direction.


How does a scrap heap magnet work?

Scrap heap magnets are basically electromagnets. Electromagnets are magnets that can be turned off and on. When they are turned on, the circuit inside them, (which normally consists of a battery, a switch, coiled wire and an iron rod) switches on. The iron rod inside the coils of wire is magnetized once the switch can be on or off. Mechanically an electromagnet is relatively simple. As soon as you apply a small electric current it becomes magnetized. The copper wire produces a magnetic field around the core just like any other magnet. The advantage is that it can be turned on or off. The only magnetic elements are iron, cobalt and nickel. This means that electromagnets can only attract those metals. They can also attract steel. This is because it is mainly made of iron. This is useful because it helps sort the metals into allocated locations. However they cannot pick up paper, wood or any other metal that is not magnetic, or made out of iron, cobalt and nickel. Scrap Heap magnets work by a very simple but effective circuit board which is in them. The circuit board includes: - A switch (To turn the electromagnet on/off) - A battery (To power the electromagnet so there is a current flowing through it) - A iron rod (This is the component that is magnetized.) - Coiled wire around the rod (the current) When a scrap heap magnet is turned on by the switch, the iron core is magnetized because of the current flowing though it due to the coiled wire and battery. This makes it magnetized and it is able to pick up any metals that are magnets and its able to place them in their designated areas in the scrap heaps.

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