“header”的概念、定义、翻译、参考文献-科学参考

header

Chemical Engineering

1. A large tank, reservoir, or hopper used to maintain a gravity feed to a process or to provide a static fluid pressure to a process or item of equipment. It is located above the process and feeds down into the process or equipment under the influence of gravity.

2. A manifold pipe connected to smaller pipes.

Computer

Some coded information that precedes a more general collection of data and gives details about it.
The header of a data-structure representation is logically distinct from the data elements themselves and may serve several purposes:
1. (a) to hold global information about the whole structure, e.g. list length, array index bounds;
2. (b) to represent an empty structure;
3. (c) to provide links into the structure, e.g. pointers to first and last nodes in a list;
4. (d) to represent the entire structure in any other data structures of which it may be a part.
In networking, the header (or head) of a cell or packet is the part that holds routing and control information used to control the passage of the cell or packet across a network.

Internet

The text that is situated before the main body of an email message. It contains information such as the date of origin of the message, the email address of the sender, and the subject of the message.

Electronics and Electrical Engineering

A few bytes at the start of a packet of data, transmitted by digital communications, that identify the sender, the receiver, the length of the packet and, in some cases, the protocol being used within the packet. See also digital communications.

单词	header
释义	header Chemical Engineering 1. A large tank, reservoir, or hopper used to maintain a gravity feed to a process or to provide a static fluid pressure to a process or item of equipment. It is located above the process and feeds down into the process or equipment under the influence of gravity. 2. A manifold pipe connected to smaller pipes. Computer Some coded information that precedes a more general collection of data and gives details about it. The header of a data-structure representation is logically distinct from the data elements themselves and may serve several purposes: (a) to hold global information about the whole structure, e.g. list length, array index bounds; (b) to represent an empty structure; (c) to provide links into the structure, e.g. pointers to first and last nodes in a list; (d) to represent the entire structure in any other data structures of which it may be a part. In networking, the header (or head) of a cell or packet is the part that holds routing and control information used to control the passage of the cell or packet across a network. Internet The text that is situated before the main body of an email message. It contains information such as the date of origin of the message, the email address of the sender, and the subject of the message. Electronics and Electrical Engineering A few bytes at the start of a packet of data, transmitted by digital communications, that identify the sender, the receiver, the length of the packet and, in some cases, the protocol being used within the packet. See also digital communications.
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