Soyjak.Party / The Sharty - The altchan born from the ashes of /qa/; also a containment thread

Destacado
https://www.hairstorynetwork.com/stories/gay-sikh-boy-forced-headshave-by-muslim-boyfriend/
1783958052547.jpeg
 
When it is heated or in a fire, it will emit toxic and corrosive gases. It is also very toxic by inhalation or skin absorption.[3]

At least two mechanisms could account for the toxicity of perchloromethyl mercaptan, as hypothesized by Althoff (1973). The first mechanism is a reaction between perchloromethyl mercaptan and biological functional groups such as hydroxyl, sulfhydryl, amino and carboxyl groups. This results in an inactivation of key enzymes. A second general pathway reaction is the hydrolysis to give hydrochloric acid.[3]
 
C L E O dijo:
5 days left of my kiwi gold, what post should I sponsor?
Presiona para expandir...
this
Cute Pie Senpai dijo:
You faggots need to understand that Love is indeed boring. Most of the fucking time, that's what real life is. You're supposed to be invested in the person so that it drives you to want to be with them for them long past the honeymoon phase where the romantic excitement and tension stops happening.
Presiona para expandir...
 
The Corliss steam engine was patented in 1849. It used pulse-width modulation to control the intake valve of a steam engine cylinder. A centrifugal governor was used to provide automatic feedback.

Some machines (such as a sewing machine motor) require partial or variable power. In the past, control (such as in a sewing machine's foot pedal) was implemented by use of a rheostat connected in series with the motor to adjust the amount of current flowing through the motor. It was an inefficient scheme, as this also wasted power as heat in the resistor element of the rheostat, but tolerable because the total power was low. While the rheostat was one of several methods of controlling power (see autotransformers and Variac for more info), a low-cost and efficient power switching and adjustment method was yet to be found. This mechanism also needed to be able to drive motors for fans, pumps and robotic servomechanisms, and needed to be compact enough to interface with lamp dimmers. PWM emerged as a solution for this complex problem.

PWM telecommunications systems were invented just prior to the start of World War II, but at that time time-division multiplexing was already in use and there were only experimental PWM systems. This changed with the introduction of the cavity magnetron in 1940, which could produce pulses of microwave frequency energy but could not vary its frequency or precisely control its amplitude. A PWM encoder was used to trigger a magnetron in the British Army's Wireless Set Number 10, which provided long-distance telephone relay, up to 80 kilometres (50 mi).[3]

By 1946, the Philips, N. V. company had designed an optical scanning system for variable area film soundtrack which used PWM while it was scanning the optical audio track transversely with a thin light beam. The electronics then evaluated the threshold between exposed (non-translucent) and unexposed (translucent) parts of the audio track. The proposed system was to reduce noise when playing a film soundtrack.[4][5]

One early application of PWM was in the Sinclair X10, a 10 W audio amplifier available in kit form in the 1960s. At around the same time, PWM started to be used in AC motor control.[6]

In the mid-1970s, early automotive applications of pulse-width modulation (PWM) were developed in the UK by Associated Engineering Developments Ltd (AED).[7] Engineers Norman Hunt and John Noddings designed systems that used pulse-width modulated electrical signals to control high-speed solenoid valves.[8][9][10] By altering the signal's duty cycle, the system could vary hydraulic and pneumatic pressure instead of just turning a solenoid valve fully open or fully closed. This technology was commercialised through AED's subsidiary company, Econocruise Ltd, based in Rugby, Warwickshire. The company used these modulated solenoid valves in pneumatic assemblies to control throttle actuators, supplying cruise control systems for luxury passenger cars and PWM speed limiters for heavy commercial trucks and buses.[11][12][13

Of note, for about a century, some variable-speed electric motors have had decent efficiency, but they were somewhat more complex than constant-speed motors, and sometimes required bulky external electrical apparatus, such as a bank of variable power resistors or rotating converters such as the Ward Leonard drive.
 
In a pulse-density modulation bitstream, a
1
{\displaystyle 1} corresponds to a pulse of positive polarity (
+
A
{\displaystyle +A}), and a
0
{\displaystyle 0} corresponds to a pulse of negative polarity (
−
A
{\displaystyle -A}). Mathematically, this can be represented as

x
[
n
]
=
−
A
(
−
1
)
a
[
n
]
,
{\displaystyle x[n]=-A(-1)^{a[n]},}
where
x
[
n
]
{\displaystyle x[n]} is the bipolar bitstream (either
−
A
{\displaystyle -A} or
+
A
{\displaystyle +A}), and
a
[
n
]
{\displaystyle a[n]} is the corresponding binary bitstream (either
0
{\displaystyle 0} or
1
{\displaystyle 1}).

A run consisting of all
1
{\displaystyle 1}s would correspond to the maximum (positive) amplitude value, all
0
{\displaystyle 0}s would correspond to the minimum (negative) amplitude value, and alternating
1
{\displaystyle 1}s and
0
{\displaystyle 0}s would correspond to a zero amplitude value. The continuous amplitude waveform is recovered by low-pass filtering the bipolar PDM bitstream.
 
Vector calculus or vector analysis is a branch of mathematics concerned with the differentiation and integration of vector fields, primarily in three-dimensional Euclidean space,
R
3
.
{\displaystyle \mathbb {R} ^{3}.}[1] The term vector calculus is sometimes used as a synonym for the broader subject of multivariable calculus, which spans vector calculus as well as partial differentiation and multiple integration. Vector calculus plays an important role in differential geometry and in the study of partial differential equations. It is used extensively in physics and engineering, especially in the description of electromagnetic fields, gravitational fields, and fluid flow.

Vector calculus was developed from the theory of quaternions by J. Willard Gibbs and Oliver Heaviside near the end of the 19th century, and most of the notation and terminology was established by Gibbs and Edwin Bidwell Wilson in their 1901 book, Vector Analysis, though earlier mathematicians such as Isaac Newton pioneered the field.[2] In its standard form using the cross product, vector calculus does not generalize to higher dimensions, but the alternative approach of geometric algebra, which uses the exterior product, does (see § Generalizations below for more).
 
Destacado
Debes iniciar sesión o registrarte para responder aquí.
Atrás
Top Abajo