玄有之思

玄有中之思（內聲）

The inner voice — inside the Presence — inside the Mystery

A holonic perception involving something that is simultaneously a self-contained entity and a part of a larger system.

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道生一，一生二，二生三，三生萬物。《道德經》 第四十二章

道生一「常」，

一生二「無／有」，

二生三「陰陽／人 ⇔ holons」，

三生萬物。

Holism versus Orientation

समग्र (समग्रता) बनाम चुंबकीय

Holism and Evolution is a 1926 book by South African statesman, Field Marshal Jan Smuts, in which he coined the word "holism", although J. Smuts' meaning differs from the modern concept of holism. He defined holism as the "fundamental factor operative towards the creation of wholes in the universe."

Invisible Presence                      無／有

• electron                            電子 (e•m•w)
• proton                              質子 (composed of two up quarks and a down quark)
• truly neutral particle        真正的中性粒子 (such as the neutral pion (π0)

Locally derived implications

A three-phase current (or voltage) system consists of three sinusoidal currents (or voltages) of the same frequency and the same amplitude which are out of phase with each other by a third of a turn, i.e. 2π⁄3 radians (or 120 degrees) in the case ideal. If the frequency is 50 Hz, then the three phases are delayed relative to each other by 1⁄150 seconds (6.6 ms). When the three conductors are traversed by currents of the same effective value and are phase-shifted by 2π⁄3, the system is said to be balanced.

In the case of electrical distribution, the network can be modelled by three sinusoidal voltage sources of identical amplitude, for example, 230 V rms in most European countries, presenting a phase angle of 120° between them. Ideally, the voltage of the three phases is constant and independent of the load, only the current of each phase should be dependent on the output power.

Due to the 120° phase shift, a network whose rms voltage between phase and neutral is 230 V will have a phase-to-phase voltage of:

Three-phase electric power (abbreviated 3φ)

Three Phase alternating current waveform. This figure illustrates one voltage cycle of a three-phase system, labelled 0 to 360° (2 π radians) along the time axis. The plotted line represents the variation of instantaneous voltage (or current) with respect to time. This cycle will repeat 50 or 60 times per second, depending on the power system frequency. The colours of the lines represent the American colour code for 120v three-phase. That is black=VL1 red=VL2 blue=VL3

The conductors between a voltage source and a load are called lines, and the voltage between any two lines is called line voltage. The voltage measured between any line and neutral is called phase voltage. For example, in a 208/120-volt service, the line voltage is 208 Volts, and the phase voltage is 120 Volts.

A three-phase distribution has 3 or 4 wires:

Three-phase conductors: the load is balanced if an identical current flows in each of the three phases. This is the case, for example, of three-phase electric motors.

A neutral conductor is not systematic but is often distributed because when a device does not consume an identical current on each of the phases, a residual current is produced, which the neutral conductor can evacuate in order to maintain the nominal distribution voltage on each of the three branches of the load.

Three-phase supplies have properties that make them desirable in electric power distribution systems:

• The phase currents tend to cancel out one another, summing to zero in the case of a linear balanced load. This makes it possible to reduce the size of the neutral conductor because it carries little or no current. With a balanced load, all the phase conductors carry the same current and so can be the same size.
• Power transfer into a linear balanced load is constant. In motor/generator applications, this helps to reduce vibrations.
• Three-phase systems can produce a rotating magnetic field with a specified direction and constant magnitude, which simplifies the design of electric motors, as no starting circuit is required.