文摘與索引數(shù)據(jù)庫的角色-文庫吧在線文庫
【正文】 – B {H2O/bin} wn ci {H2SO4/ss} wn ci ({Ga/ss} near {Al/ss} near {As/ss}) wn ci {b/dop} wn ci Fasttrack to Innovation 主題 字段 ? 標題 ? 摘要 ? 非控制詞 ? 控制詞 ? 特殊索引 – 分類代碼 – 處理代碼 – 化學索引 – 數(shù) 值 索引 Fasttrack to Innovation Fasttrack to Innovation 數(shù) 值 索引 ? 為檢索數(shù)字 /數(shù)值的 而設計的控制詞索引 ? 應用于 1987后的 文獻 Fasttrack to Innovation 檢索數(shù) 值的困難 ? Value formats – , , 2100KW, 2100000W, W or ? Units – Temperature, ? 100 degree Centigrade, ? 212 degrees Fahrenheit ? 373 Kelvin Fasttrack to Innovation 數(shù)值的格式 QUANTITY VALUE UNIT Temperature +04 K ? Quantity: Frequency, temperature ? Value: floating point format: +04 for 18000 ? Unit: Hertz, Kelvin Fasttrack to Innovation 數(shù)值的格式 QUANTITY VALUE (TO VALUE) UNIT Time + 02 to + 07 Second Value to Value = 760 to 84000000 seconds Fasttrack to Innovation 數(shù)值的格式 exponential notation QUANTITY VALUE (TO VALUE) UNIT from NDI Thesaurus ( Fasttrack to Innovation Multiplying Prefixes Prefix Abbr.. Factor exa E 1018 .......... ..... ..... giga G 109 mega M 106 kilo k 103 .......... ..... ..... milli m 103 micro mu 106 .......... ..... ..... atto a 1018 Fasttrack to Innovation 數(shù)值 索引 敘詞表 Temperature: K (Kelvin) C use K [K = C + ] degK use K degC use K [K = degC + ] degF use K [ K = (degF + ) * ] F use K [ K = (F + ) * ] thickness use size Fasttrack to Innovation 數(shù)值 索引 EV2 ? Search for a distance of 610 meters – “distance +02 m” wn ni ? Search for a time of 10 minutes – “time +02 s” wn ni ? Search for a temperature of 100 degrees Centigrade – “temperature +02 k” wn ni Fasttrack to Innovation 數(shù)值索引 檢索 WOK Fasttrack to Innovation Fasttrack to Innovation 主題 字段 ? 標題 ? 摘要 ? 非控制詞 ? 控制詞 ? 特殊索引 – 分類代碼 – 處理代碼 – 化學索引 – 數(shù) 值 索引 – 天體目標索引 Fasttrack to Innovation 文摘與索引服務的要 素 ? 廣和全的專業(yè)覆蓋； ? 高質(zhì)量的索引系統(tǒng) 。 – AlGaAs 。 applications Fasttrack to Innovation 分類代碼 B76 B7000 Instrumentation and special applications B7100 …. .B7600 Aerospace facilities and techniques B7700 Earth sciences ..B7610 General aspects of aircraft, space ... ..B7620 Aerospace test facilities and simula... ..B7630 Aerospace instrumentation ..B7640 Aerospace propulsion ..B7650 Ground support systems ...B7630A Avionics ...B7630B Power supplies ...B7630D Space vehicle electronics ...B7650C Air traffic control ...B7650E Space ground support centres Fasttrack to Innovation L1 L2 L3 L4 Fasttrack to Innovation 分類代碼 B7 B7000 Instrumentation and special applications .......... ........... .B7600 Aerospace facilities and techniques ..B7610 General aspects of aircraft, space vehicles/satellites ..B7620 Aerospace test facilities and simulation ..B7630 Aerospace instrumentation ...B7630A Avionics ...B7630B Power supplies ...B7630D Space vehicle electronics ..B7640 Aerospace propulsion ..B7650 Ground support systems ...B7650C Air traffic control ...B7650E Space ground support centres .B7700 Earth sciences enter B7 to retrieve all records below it Fasttrack to Innovation 分類代碼 B76 B7000 Instrumentation and special applications .......... ........... .B7600 Aerospace facilities a
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