Meltwater pulse 1A (MWP1a) is the name used by Quaternary geologists, paleoclimatologists, and oceanographers for a period of rapid post-glacial sea level rise during which global sea level rose between 16 m and 25 m in about 400–500 years, giving mean rates of roughly 40–60 mm /yr.
 Meltwater pulse 1A is also known as catastrophic rise event 1 (CRE1) in the Caribbean Sea.
 The rates of sea level rise associated with meltwater pulse 1A are the highest known rates of post-glacial, eustatic sea level rise.
 Meltwater pulse 1A is also the most widely recognized and least disputed of the named, postglacial meltwater pulses.
 Other named, postglacial meltwater pulses are known most commonly as meltwater pulse 1A0 (meltwater pulse 19ka), meltwater pulse 1B, meltwater pulse 1C, meltwater pulse 1D, and meltwater pulse 2.
 It and these other periods of rapid sea level rise are known as "meltwater pulses" because the inferred cause of them was the rapid release of meltwater into the oceans from the collapse of continental ice sheets.
If was an American science-fiction magazine launched in March 1952 by Quinn Publications, owned by James L. Quinn.
Flash photolysis is a pump-probe laboratory technique, in which a sample is firstly excited by a strong pulse (called pump pulse) of light from a laser of nanosecond, picosecond, or femtosecond pulse width or by a short-pulse light source such as a flash lamp.
 This first strong pulse starts a chemical reaction or leads to an increased population for energy levels other than the ground state within a sample of atoms or molecules.
 Typically the absorption of light by the sample is recorded within short time intervals (by a so-called test pulses) to monitor relaxation or reaction processes initiated by the pump pulse.
Pulse!
 was a tabloid magazine published by Tower Records (under the direction of VP of Publishing Mike Farrace) which contained record reviews, interviews and advertising.
In medicine, a pulse represents the tactile arterial palpation of the heartbeat by trained fingertips.
 The pulse may be palpated in any place that allows an artery to be compressed near the surface of the body, such as at the neck (carotid artery), on the inside of the elbow (brachial artery), at the wrist (radial artery), at the groin (femoral artery), behind the knee (popliteal artery), near the ankle joint (posterior tibial artery), and on foot (dorsalis pedis artery).
 Pulse (or the count of arterial pulse per minute) is equivalent to measuring the heart rate.
 The heart rate can also be measured by listening to the heart beat by auscultation, traditionally using a stethoscope and counting it for a minute.
 The radial pulse is commonly measured using three fingers.
 This has a reason: the finger closest to the heart is used to occlude the pulse pressure, the middle finger is used get a crude estimate of the blood pressure, and the finger most distal to the heart (usually the ring finger) is used to nullify the effect of the ulnar pulse as the two arteries are connected via the palmar arches (superficial and deep).
A new class of pulse generator microwave pulse generation microwave pulse generation architecture, the RACE (Rapid Automatic Cascode Exchange) pulse generation circuit, is implemented using low-cost monolithic IC technology and can produce pulses as short as 1 picosecond, and with repetition rates exceeding 30 billion pulses per second.
 These pulsers are typically used in military communications applications, and low-power microwave transceiver ICs.
 Such pulsers, if driven by a continuous frequency clock, will act as microwave comb generators, having output frequency components at integer multiples of the pulse repetition rate, and extending to well over 100 gigahertz.
Meltwater pulse 1B (MWP1b) is the name used by Quaternary geologists, paleoclimatologists, and oceanographers for a period of either rapid or just accelerated post-glacial sea level rise that occurred at the beginning of the Holocene and after the end of the Younger Dryas.
 Meltwater pulse 1B is also known as catastrophic rise event 2 (CRE2) in the Caribbean Sea.
 Other named, postglacial meltwater pulses are known most commonly as meltwater pulse 1A0 (meltwaterpulse19ka), meltwater pulse 1A, meltwater pulse 1C, meltwater pulse 1D, and meltwater pulse 2.
 It and these other periods of proposed rapid sea level rise are known as "meltwater pulses" because the inferred cause of them was the rapid release of meltwater into the oceans from the collapse of continental ice sheets.
C-UWB is an acronym for continuous pulse ultra-wideband (UWB) technology.
 C-UWB derives its bandwidth by virtue of the short time duration of the individual pulses.
 Information can be imparted (modulated) on UWB signals (pulses) by encoding the polarity of the pulse, the amplitude of the pulse, or by using orthogonal pulse shape modulation.
 Polarity modulation is analogous to BPSK in conventional RF technology.
 In orthogonal wave shape modulation, two orthogonal UWB pulse shapes are employed.
 These are further polarity modulated in a fashion analogous to QPSK in conventional radio technology.
 Preferably, the modulating data bits are scrambled or "whitened" to randomize the occurrences of ones and zeros.
 The pulses are sent contiguously as a continuous stream, hence the bit rate can equal the pulse rate.
A pulse storm is a single cell thunderstorm that is usually not very strong; when it is of substantial intensity, it only produces severe weather for short periods of time.
 Such a storm weakens and then generates another short burst – hence "pulse".
 Pulse storms ordinarily form in environments with low wind shear and moderate instability, with the low wind shear contributing a short average lifespan of less than an hour.
 Severe weather in a pulse storm will most often occur during a momentarily forceful updraft, taking the form of hail or particularly damaging winds brought about by downbursts. Rarely, a weak tornado develops in association with a pulse storm.
The chirp pulse compression process transforms a long duration frequency-coded pulse into a narrow pulse of greatly increased amplitude.
 It is a technique used in radar and sonar systems because it is a method whereby a narrow pulse with high peak power can be derived from a long duration pulse with low peak power.
 Furthermore, the process offers good range resolution because the half-power beam width of the compressed pulse is consistent with the system bandwidth.

Question: Pulse! and If were both what?
Answer: magazine