SIEMENS 6DD2920-0AD0 LIGHT RECEIVER MODULE
SIEMENS 6DD2920-0AD0 LIGHT RECEIVER MODULE LIGHT RECEIVER MODULE
LIGHT RECEIVER MODULE
LIGHT RECEIVER MODULE中國(guó)工業(yè)企業(yè)數(shù)據(jù)庫(kù)的使用現(xiàn)狀和潛在問(wèn)題聶輝華江艇楊汝岱內(nèi)容提要在經(jīng)驗(yàn)研究中,企業(yè)級(jí)的微觀數(shù)據(jù)正受到越來(lái)越多的重視。中國(guó)工業(yè)企業(yè)數(shù)據(jù)庫(kù)成為國(guó)內(nèi)外學(xué)者研究中國(guó)企業(yè)行為和績(jī)效的主要數(shù)據(jù)庫(kù)之一。
但是該數(shù)據(jù)庫(kù)存在樣本匹配混亂、變量大小異常、測(cè)度誤差明顯和變量定義模糊等嚴(yán)重問(wèn)題,忽視這些問(wèn)題可能會(huì)導(dǎo)致研究結(jié)論錯(cuò)誤。本文介紹了該數(shù)據(jù)庫(kù)的基本情況和使用現(xiàn)狀,指出了該數(shù)據(jù)庫(kù)存在的缺陷,并根據(jù)現(xiàn)有研究提出了改進(jìn)建議。
一引言數(shù)據(jù)是經(jīng)驗(yàn)研究的細(xì)胞,因此數(shù)據(jù)質(zhì)量的好壞直接決定了經(jīng)驗(yàn)研究的活力。zui近十多年來(lái),經(jīng)濟(jì)學(xué)界越來(lái)越重視使用微觀面板數(shù)據(jù)longitudinal micro-level da ta的研究。相對(duì)于宏觀數(shù)據(jù)或行業(yè)數(shù)據(jù),微觀的企業(yè)數(shù)據(jù)或個(gè)體數(shù)據(jù)的優(yōu)勢(shì)是非常明顯的:*,微觀面板數(shù)據(jù)包含了更多信息,例如企業(yè)的所有制、規(guī)模和出口等狀態(tài),這些信息對(duì)于企業(yè)行為的研究*;第二,微觀面板數(shù)據(jù)同時(shí)包含了時(shí)間維度和個(gè)體維度,有助于解決計(jì)量經(jīng)濟(jì)學(xué)中的個(gè)體異質(zhì)性問(wèn)題,更容易保證估計(jì)的*性;
KOLON POWER SUPPLY IC693PWR321K MANUFACTURED UNDER LICENCE GE FANUC
OMRON PLC MODULES C200H-ID215 C200H-ID212 C200H-OC222 C200H-OC225
MITSUBISHI CC-LINK INPUT/ OUTPUT UNITS AJ65SBTB1-32D AJ65SBTB1-32T
SANYO DENKI BL SUPER ROBUSTSYN RBD2C-202
FESTO VALVE TYPE DSR-12-180-P
HONEYWELL MICRO SWITCH GKNC21 NEW NOT IT BOX LOT OF 6
HONEYWELL MICRO SWITCH GKNC30 NEW NOT IT BOX LOT OF 6
AUTONICS MULTI METER MT4Y-AA-4N LOT OF TWO
AUTONICS MULTI METER MT4Y-AV-4N LOT OF TWO
AUTONICS MULTI METER MT4Y-DV-41 LOT OF TWO
WEST N6100 TEMPERATURE CONTROLLER
GE FANUC PLC IC693MDL752E OUTPUT TTL 32PT WORKING
HANYOUNG DX2 TEMP. CONTROLLER DX2_KSWNR -50'C TO 1300'C LOT OF 2
HANYOUNG DX2 TEMP. CONTROLLER KSWNR KSC 1613 -50'C TO 1300'C LOT OF 2
RED LION DC MONITOR M2444B
GE FANUC PLC MODULE- IC655MDL512B INPUT MODULE 32 CIRCUITS NO SIDE COVER
FUJIKIN DIAHPRAGM VALVE LOT OF 4 TWO 067645 TWO 038818 INLET OUTLET DIA. 1/4in
OMRON S8PS-10024 POWER SUPPLY TESTED WORKING
HILSCHER GMBH DEVICENET PCI CARD CIF50-DNM, CIF50 BSL-DN V1.503
GE FANUC POWER SUPPLY IC693PWR321S TESTED WORKING, FREE SHIPPING!
SIEMENS SIMATIC,S7 1P 6ES7 -307-1BA00-0AA0
SIEMENS SIMATIC, 6ES5430-4UA13
OMRON SYSMAC MINI SK20 PROGRAMMABLE CONTROLLER SK20-C2DR-D PLC
MITSUBISHI AC SERVO DRIVE MR-C10A1 100W
SHIMADEN CONVERTER CP2MD-4613-0
SMC MGPM25-40 Compact Guide Cylinder
MOORE INDUSTRIES IPT2/4-20MA/3-27PSIG/35PSI-FA1 [DIN]
MOORE INDUSTRIES IPT2/4-20MA/3-27PSIG/35PSI-FA7 [DIN]