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检索“数值数据”字段

“数值数据索引”字段包含结构化的数值数据,这些数据采用相应的计量单位。

要检索“数值数据”字段,请在每个值前添加数值数据字段标识和一个表示检索式中的值与检索到的记录中的值或值范围之间关系的符号。

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数值数据字段标识

AG = Age (yr; Year)

MA = Mass (kg; Kilogram)

AL = Altitude (m; Meter)

MD = Magnetic Flux Density (T; Tesla)

AP = Apparent Power (VA; Volt-amp)

MS = Memory Size (Byte)

BI = Bit Rate (Bit/s; Bits per Second)

NF = Noise Figure (dB; Decibel)

BW = Bandwidth (Hz; Hertz)

PO = Power (W; Watt)

BY = Byte Rate (Byte/s; Bytes per Second)

PR = Pressure (Pa; Pascal)

CAP = Capacitance (F; Farad)

PRS = Printer Speed (cps; Characters per Second)

CON = Conductance (S; Siemens)

PX = Picture Size (pixel; Picture Element)

CE = Computer Execution Rate (IPS; Instructions per Second)

RA = Radiation Absorbed Dose (Gy; Gray)

CM = Computer Speed (FLOPS; Floating-Point Operations Per Second)

RD = Radiation Dose Equivalent (Sv; Sievert)

CUR = Current (A; Ampere)

RE = Resistance (Ohm)

DI = Distance (m; Meter)

RP = Reactive Power (VAr; Volt-Amp Reactive)

DP = Depth (m; Meter)

RX = Radiation Exposure (C/kg; Coulomb per Kilogram)

EF = Efficiency (Percent)

RY = Radioactivity (Bq; Becquerel)

EL = Electrical Conductivity (S/m; Siemens per Meter)

SI = Size (m; Meter)

EN = Energy (J; Joule)

SM = Stellar Mass (Msol; Solar Mass)

ER = Electrical Resistivity (ohmm; Ohm meter)

SR = Storage Capacity (Bit)

EV = Electron Volt Energy (eV; Electron Volt)

TE = Temperature (K; Kelvin)

FR = Frequency (Hz; Hertz)

TM = Time (s; Second)

GA = Gain (dB; Decibel)

VE = Velocity (m/s; Meters per Second)

GD = Galactic Distance (pc; Parsec)

VO = Voltage (V; Volt)

GEO = Geocentric Distance (m; Meter)

WA = Wavelength (m; Meter)

HD = Heliocentric Distance (AU; Astronomical Unit)

WL = Word Length (Bit)

LS = Loss (dB; Decibel)

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相等和关系运算符

运算符

定义

=

等于

= LT

小于

= GT

大于

= LTE

小于等于

= GTE

大于等于

:

在该符号左边和右边的值定义的范围内

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示例

TE = 1.0E+02 检索等于 1.0E+02 的温度值。如果 1.0E+02 属于某个范围,则此检索还将检索该范围内的值。

TE = GT 1.0E+02 检索大于 1.0E+02 的温度值。如果某一范围内的任何值大于 1.0E+02,则此检索还将检索具有该范围内的值的记录。

TE = 1.0E+02:2.0E+03 检索在 1.0E+02 与 2.0E+03 之间(包含这两个值)的温度值。如果某一范围内的任一值在检索式的值范围内,则此检索还将检索该范围内的值。这与在“检索”页面上进行范围检索是等效的。

TE = GTE 1.0E+02 AND TE = LTE 2.0E+03 检索同一记录中大于等于 1.0E+02 且小于等于 2.0E+03 的温度值。