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自助借还作为一种先进的图书馆管理设备,已在很多图书馆中使用。本文通过自助借还机在石河子大学的使用实践,分析了自助借还系统的优势和不足,并提出相应的改进措施。 相似文献
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J. Tiusanen 《Precision Agriculture》2009,10(5):372-381
Wireless underground Soil Scout prototypes, introduced here for the first time, were used for remote soil monitoring during
5 months in real conditions. Every Soil Scout transmitted moisture and temperature data once every 10 min. The prototype system
works well. A signal attenuation model is able to predict long periods of lost signals when soil moisture and on-soil vegetation
conditions change. The model attenuation −98 dB is the threshold level for distinguishing probable failure from success, even
if the system hardware design would suggest −110 dB. Individual transmission failures do not always correlate to changes of
condition. Further work should focus on increasing transmission power and improving knowledge of the effect of vegetation. 相似文献
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RFID近年来成为图书馆研究的热点。为了更好地研究和利用RFID技术为图书馆服务,以2000年-2011年间CNKI数据库收录的关于图书馆RFID应用的文献为研究对象,运用文献计量学方法,分别进行栽文分析、著者分析、期刊分析和主题分析。 相似文献
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RFID在图书馆自动化管理中的应用 总被引:1,自引:0,他引:1
罗惠琼 《农业图书情报学刊》2011,23(9):101-103,203
RFID即射频识别,是一种出现于20世纪90年代的新的存在的问题,介绍了RFID技术的基本概念和工作原理.用优势及其存在的问题。自动识别技术。描述了传统模式下的图书馆管理最后分析RFID技术在图书馆自动化管理中的应 相似文献
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T. Ishikawa R. Tanaka S. Suzuki Y. Miyaishi H. Akagi Y. Iino R. Fukushima Y. Yamane 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2010,24(2):342-347
Background: Despite many epidemiological reports concerning the efficacy of angiotensin‐converting enzyme (ACE) inhibitors in dogs with mitral regurgitation (MR), the hemodynamic effects of ACE inhibitor administration have not been fully evaluated. Objectives: To document left atrial pressure (LAP) in dogs with MR administered ACE inhibitors, in order to obtain interesting information about daily LAP changes with administration of ACE inhibitors. Animals: Five healthy Beagle dogs weighing 9.8 to 14.2 kg (2 males and 3 females; aged 2 years). Methods: Experimental, crossover, and interventional study. Chordae tendineae rupture was induced, and a radiotelemetry transmitter catheter was inserted into the left atrium. LAP was recorded for 72 consecutive hours during which each of 3 ACE inhibitors—enalapril (0.5 mg/kg/d), temocapril (0.1 mg/kg/d), and alacepril (3.0 mg/kg/d)—were administered in a crossover study. Results: Averaged diurnal LAP was significantly, but slightly reduced by alacepril (P= .03, 19.03 ± 3.01–18.24 ± 3.07 mmHg). The nightly drops in LAP caused by alacepril and enalapril were significantly higher than the daily drops (P= .03, ?0.98 ± 0.19 to ?0.07 ± 0.25 mmHg, and P= .03, ?0.54 ± 0.21–0.02 ± 0.17 mmHg, respectively), despite the fact that the oral administrations were given in the morning. Systolic blood pressure (122.7 ± 14.4–117.4 ± 13.1 mmHg, P= .04) and systemic vascular resistance (5800 ± 2685–5144 ± 2077 dyne × s/cm5, P= .03) were decreased by ACE inhibitors. Conclusions and Clinical Importance: ACE inhibitors decrease LAP minimally, despite reductions in left ventricular afterload. ACE inhibitors should not be used to decrease LAP. 相似文献