Why don't all trees have growth rings? Detailed answer

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Why don't all trees have growth rings? Detailed answer

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Why don't all trees have growth rings?

It is widely known that the age of a tree can be determined by the growth rings on the cut, the appearance of which is due to the change of seasons and the accompanying acceleration or deceleration of the growth of tree tissues. But this phenomenon is valid only for plants of the temperate zone. In tropical regions, where the climate is approximately the same throughout the year and there are no clearly defined periods of cooling or drought, most trees do not form visible annual rings. To find out their age, it is necessary to analyze the concentration of certain chemical elements in the wood.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What kind of elaborate murder in a James Bond film is unnatural?

In the movie Goldfinger, James Bond finds his girlfriend Jill Masterson dead after being covered in gold paint. At the time the film was made, it was indeed a misconception that covering the whole person in paint would result in death by stopping breathing through the skin. The actress was painted gold, but the skin under the thong was left intact, since, again, this is the way to avoid asphyxia that was used by the dancers who painted the body. In fact, a person receives the absolute majority of oxygen through the nose and mouth, so the paint on the body cannot in any way cause suffocation. The danger may lie in the toxins contained in it, or in the fact that the paint will clog the pores and thereby cause the body to overheat.

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PWM stabilizer with sequencer and auto-tracking 28.07.2008

ON Semiconductor has introduced the NCP312x family of two-terminal pulse-width buck regulators that provide auto-tracking and sequencing capabilities.

Based on integrated MOSFETs providing 2 A (NCP3120, NCP3122) or 3 A (NCP3121, NCP3123) output current with switching frequencies up to 2,2 MHz, these components are suitable for use in a variety of systems. Auto-tracking and sequencing capabilities make precise timing and control of both output channels possible.

A digital signal processor or a user-programmable logic array requires versatile power supplies that deliver different levels of current with specific timing for each. This timing prevents non-operating conditions that could cause the system to fail in a working environment.

The NCP312x range provides programmable gain detection, serial control, and distortion control to control voltage behavior during start-up and shutdown. In addition, multiple components in the NCP312x range can be daisy-chained to drive a multi-channel output. This family of converters reduces input capacitance requirements by switching 180° on phase misalignment from 200 kHz to 2,2 MHz. This common-mode operation allows a single inexpensive electrolytic or ceramic capacitor to be used for the input filter instead of two capacitors in the standard configuration.

The outputs can also be paralleled, which provides for the installation of one two-phase regulator with low ripple voltage. Models NCP3120, NCP3121, NCP3122 and NCP3123 are available in QFN-32 packages.

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