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Geiger counter A Geiger-Mueller tube contains a copper cylinder with a negative charge Down the center of this cylinder runs a rigid wire with a positive charge The voltage across the wire and cylinder is kept just below the point at which a spontaneous discharge, or spark, occurs When a charged particle or gamma ray enters the tube, it ionizes a gas atom between the copper cylinder and the wire The positive ion that is produced is accelerated toward the copper cylinder by the potential difference, and the electron is accelerated toward the positive wire As these charged particles move toward the electrodes, they create an avalanche of charged particles, and a pulse of current goes through the tube Condensation trails A device once used to detect particles was the Wilson cloud chamber The chamber contained an area supersaturated with water vapor or ethanol vapor When charged particles traveled through the chamber, leaving a trail of ions in their paths, vapor condensed into small droplets on the ions In this way, visible trails of droplets, or fog, were formed In a similar detector still used today, the bubble chamber, charged particles pass through a liquid held just above the boiling point In this case, the trails of ions cause small vapor bubbles to form, marking the particles trajectories, as shown in Figure 30-13 Recent technology has produced detection chambers called wire chambers that are like giant Geiger-Mueller tubes Huge plates are separated by a small gap filled with a low-pressure gas A discharge is produced in the path of a particle passing through the chamber A computer locates the discharge and records its position for later analysis Neutral particles do not leave trails because they do not produce discharges The laws of conservation of energy and momentum in collisions can be used to tell if any neutral particles were produced Other detectors measure the energy of the particles The entire array of detectors used in high-energy accelerator experiments, such as the Collider Detector at Fermilab (CDF), can be up to three stories high, as shown in Figure 30-14a The CDF is designed to monitor a quarter-million particle collisions each second, as though the detector functioned as a 5000-ton camera, creating a computer picture of the collision events, as shown in Figure 30-14b.

Figure 30-14 The Collider Detector at Fermilab (CDF) records the tracks from billions of collisions (a) A CDF computer image of a top quark event is shown (b)

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The model of the atom in 1930 was fairly simple: protons and neutrons surrounded by electrons There also was a particle with no mass called a gamma particle (photon) Different combinations of these four elementary particles seemed to describe the contents of the universe quite well More detailed studies of radioactive decay disturbed this simple picture While the particles and gamma rays emitted by radioactive nuclei have single energies that depend on the decaying nucleus, particles are emitted with a wide range of energies One might expect the energy of the particles to be equal to the difference between the energy of the nucleus before decay and the energy of the nucleus produced by the decay In fact, the wide range of energies of electrons emitted during beta decay suggested to Niels Bohr that energy might not be conserved in nuclear reactions Wolfgang Pauli in 1931 and Enrico Fermi in 1934 suggested that an unseen neutral particle was emitted with the particle Named the neutrino ( little neutral one in Italian) by Fermi, the particle, which is actually an antineutrino, was not directly observed until 1956 Studies with cosmic rays discovered more particles A positive electron, or positron, was found in 1932, and what seemed to be a heavy electron, the muon, in 1937 In 1935, a remarkable hypothesis by Japanese physicist Hideki Yukawa spurred much research in the years to follow Yukawa hypothesized the existence of a new particle that could carry the nuclear force through space, just as the photon carries the electromagnetic force In 1947 a possible particle, the pion, was discovered While it was not the carrier of the strong force, it was a new type of matter Experiments with particle accelerators resulted in the identification of more and more particles, some with intermediate masses, others much more massive than the proton They had positive and negative charges, or none at all Some lifetimes were 10 23 s, while others had no detectable decays Most mysterious were the chargeless, massless neutrinos At one point Enrico Fermi, asked to identify a particle track, replied If I could remember the names of all these particles, I d be a botanist!.

The selected object (the button) is at the bottom, and all its superviews (in this case just one view, the window s content view) are stacked up above it. Click the checkbox to turn on a layer for the content view. You can leave the checkbox for the button unchecked, since the superview will establish a layer for it. Now save everything, Build & Run your app, and you ll see the exact same behavior as we had before. So, this new version achieves the same result, at the expense of a few additional lines of code. So far it doesn t seem like much of a win here. But wait, there s more! Explicit animation via the animation classes, such as CABasicAnimation, lets us do several more key things that we couldn t do with implicit animation. For starters, we can set the animation s duration. Add the following line just before adding the animation to the layer (with [[sender layer] addAnimation:a forKey:@"position"]) to make this animation run a little more slowly:

Figure 30-15 Even though quarks have fractional charges, all the particles they make have whole-number charges

PostgreSQL uses the two-phase commit approach to committing transactions The two-phase commit performs the transaction using two steps (or phases): 1 A prepare phase where a transaction is analyzed to determine if the database is able to commit the entire transaction 2 A commit phase, where the transaction is physically committed to the database The two-phase commit approach allows PostgreSQL to test all transaction commands during the prepare phase without having to modify any data in the actual tables Table data is not changed until the commit phase is complete

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