What Is Pulseless Electrical Activity?

Pulse usually refers to a kind of electrical shock (voltage or current) like pulse, which is often used in electronic technology. The main characteristics are waveform, amplitude, width and repetition frequency. ^{[1] A} pulse is a signal that occurs for a short period of time in the entire signal period relative to a continuous signal. There is no signal in most signal periods. Just like the pulse of a person. Now generally refers to digital signals, it is already a signal in half of a cycle. The signals in the computer are pulse signals, also called digital signals. In addition, pulses are also used to express thoughts and feelings. ^[1]

Literally:

Pulse nerve pulse

Nerve impulses should be properly called nerve im-pulse. When a certain part of the nerve is stimulated with sufficient intensity, an action potential is generated in the part, and from this point, the nerve fiber propagates in two directions. Impulse has the same meaning as action potential, but it is used when it is viewed as a signal that propagates along the axon. According to the primary site of the impulse, in the mesial nerve, it is an organ that produces an effect from the center to the periphery, and in the mesial nerve, it is unidirectionally transmitted from the peripheral receptor to the center. Its role is to connect the central and peripheral signals. The conduction velocity of impulses can vary depending on the presence or absence of myelin sheath and thickness of nerve fibers. The transmission speed of myelinated nerves is directly proportional to the fiber diameter. In mammals, the fiber diameter (micrometers) × 6 m / s is used to express up to 120 m / s. The transmission speed of unmyelinated nerves is proportional to the square root of the diameter. Proportional, usually below 2-3 meters / second.

Pulse pulse signal

A voltage or current that changes suddenly and suddenly and is applied for a short time is called a pulse signal. It can be repeated periodically, aperiodically or single time. A pulse signal is a discrete signal with a variety of shapes. Compared with ordinary analog signals (such as sine waves), the waveforms are discontinuous in the time axis (there is a clear interval between the waveforms) but have a certain periodicity. Is its characteristic. The most common pulse wave is a rectangular wave (that is, a square wave). Pulse signals can be used to represent information and can also be used as carrier waves, such as pulse code modulation (PCM), pulse width modulation (PWM), etc. in pulse modulation, and can also be used as clock signals for various digital circuits and high-performance chips. . The so-called pulse signal is a curve with countless breakpoints in plane coordinates, that is to say, the limit of the point does not exist at some periodic locations, such as sawtooth waves, and there are also signals from digital circuits used in computers, 0,1 . Pulse signals, that is, signals such as pulse beats. Compared to DC, intermittent signals, if the water flow is used to describe it, DC means that the faucet is kept flowing and the pulse is constantly turning the faucet to form a water pulse. You turn the flashlight on and the light is on. This is direct current. If you keep turning the light on and off, a pulse is formed. The speed of the switch is the pulse frequency. ^[2]

Pulse electromagnetic pulse

Electromagnetic pulse (EMP) is a powerful energy field that is generated instantaneously. It is very sensitive to energy waves and can destroy countless power systems and high-tech microcircuits in the distance. The explosion of nuclear weapons in the high-altitude atmosphere can produce a huge electromagnetic pulse effect. This is the phenomenon of high-altitude electromagnetic pulse (HEMP). ^[3]

Pulsed pulse reactor

A reactor that can reach a supercritical state in a short time interval, which produces high pulse power and strong neutron flux, and can be repeatedly operated safely and reliably. It is divided into thermal neutron pulse reactor and fast neutron pulse reactor. China has built a uranium-zirconium pulse reactor, which is a reactor fueled by zirconium-hydrogen. It mainly uses hydrogen as a moderator. When the power increases, the temperature will increase, the moderating effect of hydrogen will weaken, and the reactivity will immediately decrease. The reactor has a large instantaneous negative temperature coefficient, so it runs in pulses. In addition to training personnel, conducting research and producing short-lived radioisotopes, pulsed reactors can also be used to treat cancer, neutron photography, activation analysis, and irradiate fuels and materials. ^[4]

Pulse pulse power

The user's load needs to be powered on intermittently, that is, according to a certain time rule, the load is powered on for a certain period of time, and then turned off for a certain period of time. Repeatedly executed in this way, a pulse power source is formed. For example, in the sophisticated process of non-polar electrolytic capacitors, it is necessary to charge the capacitor in a forward direction for a period of time, and then discharge it, and then charge the capacitor in a reverse direction for a period of time, and then discharge it, so that a forward direction discharge (power failure) reverse direction Discharging Forward ..., and so on.

1.Single- pulse power supply <br /> Single- pulse power supply generally outputs unidirectional pulse current with fixed parameters. If you want to change the pulse parameters, you need to reset after stopping.

2. Double pulse power supply < br Double pulse power supply generally has a fixed period of commutation pulse current. If you want to change the pulse parameters, you need to reset the double pulse power supply after the reverse pulse anodization to dissolve the cathode surface The ion concentration rapidly rises, which is conducive to the use of high pulse current density in the subsequent cathode cycle, so the coating is dense, bright, and low porosity; the reverse pulse anode stripping of the dual pulse power supply makes the organic impurities (including brightener) in the coating The adhesion is greatly reduced, so the coating has high purity and strong resistance to discoloration. YS-9000 wing-lift intelligent pulse electroplating power supply provides a powerful means for the development and production of nano electroplating technology

Specifications

1. Output waveform: square wave pulse or DC 2. Pulse frequency: 1-100HZ 100-1000HZ 200-2000HZ 500 5000Hz 10KHZ-30KHZ
3. Pulse duty cycle: 0 100%
4. Forward and reverse pulse commutation time: 0 9999ms

5. Output voltage: 0-100V

6. Maximum output average current: 0-5000A
7. Maximum peak current: 15000A

Pulse pulse width

Is the duration of the high level. It is often used as a trigger signal for sampling signals or thyristors.

Pulse pulse circuit

It is the circuit that generates, shapes and transforms the pulse waveform. A pulse circuit is made up of two parts: an inert circuit and a switch. The role of the switch is to destroy the steady state and make the circuit appear transient.

Pulse pulse dialing

Is a time-domain processing method, which uses the number of pulses to represent the number digits. The pulse dialing method has strict requirements on the pulse width, size, interval, and shape. If these parameters are changed due to line interference or other reasons, it may cause errors in number reception. On the other hand, because each pulse occupies a certain time (generally each pulse takes 100ms), this dialing method is relatively slow.