What is AC and what is AC?

Physical Enthalpy of Atomization: kj mol @25 301 Heat capacity: j (mol· k) Thermal conductivity: w (m·k) alternating current

If it is AC220V, it means that the AC voltage is 220V. Chemical Electron Affinity and Energy:

0 kj·mol-1 first ionization energy: 0 kj·mol-1 second ionization energy: 0 kj·mol-1 third ionization energy:

0 kj·mol-1 elemental density: g cm3 elemental melting point: elemental boiling point:

Atomic Radius: 0 Angstroms Ionic Radius: Angstroms Covalent Radius:

It is found in all uranium ores and is extremely rare. Radium is usually obtained by treating radium with neutrons in the reactor. Element Usage:

There is no practical use. Element Symbol: ac English name:

Actinium Chinese name: Actinide relative atomic mass.

0 Common valences.

Electronegativity. 0 Peripheral Electron Configuration: 6d1 7s2 Extranuclear Electron Configuration: 2,8,18,32,18,9,2 isotopes.

and radiation: AC-225[10D] AC-226[ AC-227 ( AC-228[ In addition, AC is also an abbreviation for acetate (CH3COO-), such as NAAC is sodium acetate.

CH3COONA), HAC is acetic acid (CH3COOH), note that AC should be placed at the end of the abbreviation to distinguish it from actinide metal.

The chemical symbol for the actinide element: AC

In summary, there are the following:

1. AC is the abbreviation of all clean in English, which means all cleared, that is, people often say "clear".

2. AC is the abbreviation of adaptive control, which means: adaptive control, which is one of the types of numerical control system.

3. AC is the abbreviation of academic, which is translated as "academic" in Chinese.

4. AC, short for Ascension Island (Asunción Island), is located in the southern Atlantic, near Africa, and is a British colony.

5. AC is the abbreviation of the Antarctic Circle.

6. On the ordinary calculator, both AC and CE are cleared, AC is to clear the current, and CE is to clear the history.

7. AC is the abbreviation of access controller, which means: access controller.

ACC is amorphous calcium carbonate.

Abbreviation of Amorphous Calcium Carbonate, amorphous calcium carbonate is the most unstable polymorphic calcium carbonate among the six types of calcium carbonate. There are relatively few domestic researches, mainly in the Shinno laboratory. On January 25, 2019, Zou Chaoyong, an associate researcher at the State Key Laboratory of Material Composite Technology of Wuhan University of Technology, published a report in Science that when they studied the role of magnesium ions in the crystallization process of amorphous calcium carbonate, they accidentally discovered a new type of aqueous calcium carbonate crystal phase - calcium semihydrate (CaCO3·1 2H2O), which ushered in the third "family pure return member" hydrated crystal phase for the calcium carbonate family.

It shows that ACC was discovered in 1989, but it is difficult to store ACC for a long time after synthesis, but in 2013 a company called Amorphical Ltdof companies sell dietary supplements with ACC as the main ingredient.

ACC is a direct precursor of ethylene biosynthesis.

Ethylene is an important plant hormone, and its physiological functions include: promoting fruit ripening and poor signal, promoting leaf senescence, inducing adventitious roots and root hair genesis, breaking the dormancy of plant seeds and buds, etc. In 1979, Adams proposed that the ethylene biosynthesis pathway is methionine SAM ACC ethylene (Adams, 1979), and found that in plant tissues, the rate of ethylene formation is closely related to the ACC content in tissues, and when ACC is applied to plant plant organs, a significant increase in ethylene production can be observed (Cameron, Et al., therefore, Adams et al. believe that the synthesis of ACC in plants is a rate-limiting step in the ethylene biosynthesis pathway, The amount of ethylene released depends on the content of ACC and the rate of synthesis.

Therefore, the determination of ACC content and ACC synthesis rate is of great significance for Kaichai to investigate the synthesis of ethylene in plants.

ACC is the direct pre-orthomorphic body of ethylene biosynthesis, ethylene is an important plant chaffinin, and its physiological functions include: promoting fruit ripening, promoting leaf senescence, inducing adventitious roots and root hair generation, breaking the rest of plant seeds and buds, etc.

The chemical elements of AC are:Actinium.

Actinium is a natural radioactive element, chemical symbol AC, atomic number 89, relative mass of atoms, belongs to the crude old actinide element, is a silvery-white metal. Its English name** is derived from the Greek word aktis (ray). 1899 A. of France

A lDerbielne separates actinium from uranium slag.

Introduction of actinium

It is a silvery-white metal with a melting point of 1320k 50k, a boiling point of 3470k 300k, and a density of (293k) 10062kg m.

Actinium metal has a face-centered cubic lattice. The configuration of the outer electron shell of the actinide atom is (rn)6d7s. The oxidation state of actinium is +3.

Its chemical properties are very similar to those of lanthanum and yttrium. Actinium's fluoride, hydroxide, carbonate, phosphate, and oxalate are insoluble in water. Tracer amounts of actinide are commonly used lanthanum fluoride or lanthanum oxalate co-precipitated carrier bands.

Lanthanides can be separated from actinide by ion-exchange chromatic separation (see Rare Earth Element Chromatic Separation) or solvent extraction.

Since uranium ore contains rare earth elements, only actinium concentrates can be obtained from uranium ore. In the reactor, the radium-226 target is irradiated with thermal neutrons, and high-purity 227ac can be prepared by nuclear reaction. The irradiated laser target is dissolved with dilute nitric acid, and concentrated nitric acid is added to precipitate the radium.

Filtration, the rock liter filtrate is passed through an anion exchange resin column to separate AC from thorium-228. Actinium was then purified by oxalate precipitation and burned at a temperature of 973K to obtain Ac2O3. Belgium used this method in the 70s of the 20th century and produced about 20g actinium-227.

In general, AC is alternating current, which refers to the current that periodically changes in the magnitude and direction of the current over time, and the average operating value in a cycle is zero.

For example, AC-DC is AC to DC, and the output is DC. For example, AC-AC is AC into AC, and the output is AC. AC is alternating current and DC is direct current.

In the wireless network system, AC stands for wireless controller, is a network equipment, mainly used to centralize the control of the controllable wireless access point in the local area network, the wireless access point is called AP in the wireless network system, and all AC and AP in the current market are managed by the same manufacturer.

In the Internet, AC is a wireless router, the full name of AC is, is a new Wi-Fi standard, at present, most browsers in the market are standard routers, the fastest speed can reach 300Mbps, and AC wireless routers can reach the fastest, which is often said to be gigabit routing.

In the computer, the AC key is the zero key, which is the abbreviation of the English Allclean, after pressing the AC key, no matter what is displayed in the calculator now, it will become 0, and the CE key (clear key) is different in that the CE key only clears the number that is currently being entered, and the numbers and symbols entered before will be saved.