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“物理学和天文学分列表” PACS码

时间:2010-10-17 07:40:32  来源:  作者:

The Physics and Astronomy Classification Scheme® (PACS®) is a hierarchical subject classification scheme designed to classify and categorize the literature of physics and astronomy. PACS provides an essential tool for classification and efficient retrieval of literature in physics and astronomy; as such, PACS is used by AIP and other international publishers of journals in physics, astronomy, and related fields.

PACS contains ten broad subject categories subdivided into narrower categories. The hierarchy includes mainly four levels of depth, with the narrowest term giving the most detailed characterization. However, beginning with the 2006 edition, a fifth-level hierarchy was introduced; subsequently, in this new edition, the fifth-level hierarchy is continued in sections that have undergone revision and will also be a part of future editions. PACS also includes detailed appendices for acoustics and geophysics, a nanoscale science and technology supplement, and a topical alphabetical index with corresponding PACS codes.

Depending on the topic, the most detailed PACS code may be found at the third, fourth, or fifth hierarchical levels. At these three levels, each PACS code consists of six alphanumeric characters divided into three pairs. The examples, in the table below, illustrate the structure and format of PACS codes for all levels of the scheme, using PACS codes where the hierarchy terminates at the third, fourth, and fifth levels:

PACS
Level
Hierarchy
to 3rd Level
Hierarchy
to 4th Level
Hierarchy
to 5th Level
Notes

1st
00. GENERAL
30. ATOMIC AND MOLECULAR PHYSICS
90. GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS
Broadest category; there are 10 such codes from 00 to 90, in increments of 10.

2nd
04. General relativity and gravitation
32. Atomic properties and interactions with photons
91. Solid Earth physics
More specific category; up to 9 such codes under each 1st-level category.

3rd
04.65.+e Supergravity
32.10.−f Properties of atoms
91.25.−r Geomagnetism and paleomagnetism; geoelectricity
Fairly specific category; "−" or "+" as 5th character denotes presence or absence, respectively, of 4th level.

4th

32.10.Hq Ionization potentials, electron affinities
91.25.F− Rock and mineral magnetism
Most specific category found in most of PACS; "−" or a lowercase letter as the 6th character denotes presence or absence, respectively, of 5th level.

5th


91.25.fd Environmental magnetism
Most specific category found in PACS; the 5th character is the same as for the 4th-level code, but lowercase.
 

Note that the use of upper- and lowercase letters as the fifth character for fourth- and fifth-level codes, respectively, is a means to easily distinguish the level of a given code; the use of italics for the fifth level serves a similar purpose. However, case and font are not needed to determine uniqueness, i.e., there are no redundant codes.

How to Use PACS
In order to classify an article, the main topics presented in that article must be identified. The most specific PACS codes that describe the content of an article are then selected using the alphabetical index to PACS. The first code is reserved for the main topic of the paper. Select as many codes as are necessary to classify the paper; three to four codes are generally sufficient. For errata or related items, an additional code must be selected from the section, 99.10.-x Errata and other corrections.

Note for Publishers: Publishers are encouraged to contact AIP's Business Development department before using PACS in any publishing or related business activity. Both "PACS" and "Physics and Astronomy Classification Scheme" are registered trademarks of the American Institute of Physics.

 

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