scholarly journals In-situ Monitoring Test on Corrosivity of Atmospheric Environment Where Electrical Control Unit Was Set Up

2007 ◽  
Vol 56 (5) ◽  
pp. 215-221 ◽  
Author(s):  
Kazumi Fujii ◽  
Kenya Ohashi ◽  
Teruyuki Aono
Keyword(s):  
Control Unit ◽  
In Situ Monitoring ◽  
Atmospheric Environment ◽  
Electrical Control ◽  
Monitoring Test ◽  
Set Up

In Situ Monitoring Test for Rock Slope Stability in Li County Earthquake Zone of Sichuan Province

2012 ◽  
Vol 204-208 ◽  
pp. 2473-2477
Author(s):  
Jian Hua Liu
Keyword(s):  
Slope Stability ◽  
Rock Slope ◽  
Sichuan Province ◽  
In Situ Monitoring ◽  
Traffic Load ◽  
Seismic Load ◽  
Horizontal Deformation ◽  
Monitoring Test ◽  
Earthquake Zone

Combined with the highway from Lixian to Xiaojin, the in-situ monitoring test for Baozizui rock slope was carried out in Li County earthquake zone of Sichuan province, and three earthquakes whose magnitude exceeds 4.8 times had occurred during the monitoring period. According to monitoring results, the main conclusion was shown that the slope deformation attenuated and tended to be stable after two month of construction. Considered the anti-inclined structural face in the slope, the compacting deformation action, which was beneficial to slope stability. Moreover, seismic load had great influence on horizontal deformation of structural face in surface rock layer. And the reason was that there was regional stress bearing compression and shear in the nappe structures located on the thrust fault upper plate of this slope. The variation of horizontal deformation was frequent in earlier stage located at the road curve, in which there existed the traffic load, seismic excitation effects. And the later observational data indicated that the deformation has been basically stabilized.

scholarly journals A versatile, refrigerant- and cryogen-free cryofocusing–thermodesorption unit for preconcentration of traces gases in air

2016 ◽  
Vol 9 (11) ◽  
pp. 5265-5279 ◽  
Author(s):  
Florian Obersteiner ◽  
Harald Bönisch ◽  
Timo Keber ◽  
Simon O'Doherty ◽  
Andreas Engel
Keyword(s):  
Rapid Heating ◽  
Ambient Air ◽  
In Situ Monitoring ◽  
Gas Chromatography Mass Spectrometry ◽  
Research Station ◽  
Vacuum Insulation ◽  
Laboratory Operation ◽  
And Performance ◽  
Set Up

Abstract. We present a compact and versatile cryofocusing–thermodesorption unit, which we developed for quantitative analysis of halogenated trace gases in ambient air. Possible applications include aircraft-based in situ measurements, in situ monitoring and laboratory operation for the analysis of flask samples. Analytes are trapped on adsorptive material cooled by a Stirling cooler to low temperatures (e.g. −80 °C) and subsequently desorbed by rapid heating of the adsorptive material (e.g. +200 °C). The set-up involves neither the exchange of adsorption tubes nor any further condensation or refocusing steps. No moving parts are used that would require vacuum insulation. This allows for a simple and robust design. Reliable operation is ensured by the Stirling cooler, which neither contains a liquid refrigerant nor requires refilling a cryogen. At the same time, it allows for significantly lower adsorption temperatures compared to commonly used Peltier elements. We use gas chromatography – mass spectrometry (GC–MS) for separation and detection of the preconcentrated analytes after splitless injection. A substance boiling point range of approximately −80 to +150 °C and a substance mixing ratio range of less than 1 ppt (pmol mol−1) to more than 500 ppt in preconcentrated sample volumes of 0.1 to 10 L of ambient air is covered, depending on the application and its analytical demands. We present the instrumental design of the preconcentration unit and demonstrate capabilities and performance through the examination of analyte breakthrough during adsorption, repeatability of desorption and analyte residues in blank tests. Examples of application are taken from the analysis of flask samples collected at Mace Head Atmospheric Research Station in Ireland using our laboratory GC–MS instruments and by data obtained during a research flight with our in situ aircraft instrument GhOST-MS (Gas chromatograph for the Observation of Tracers – coupled with a Mass Spectrometer).

Analysis on Foundation Excavation Side Slope Stability and Over-Break Depth of Embedded Pile Cap in HZM Bridge

2012 ◽  
Vol 256-259 ◽  
pp. 1697-1702
Author(s):  
Qi He Wu ◽  
Wei Tian ◽  
Zheng Zhong Qiu ◽  
Zhao Niu
Keyword(s):  
Slope Stability ◽  
Theoretical Calculation ◽  
In Situ Monitoring ◽  
Scale Model ◽  
Single Beam ◽  
Topographic Survey ◽  
Pile Cap ◽  
Monitoring Test ◽  
Calculation Analysis

In the paper, relying on the full-scale model test of embedded pile cap of the HZM Bridge, the method of combining the theoretical calculation analysis and in-situ monitoring test are used to study the slope stability and over-break depth of foundation excavation. In the theoretical calculation analysis, an empirical formula of the Hydtology of Sea-port is adopted for the over-break depth while the G-slope software is for the safety factor of slope stability; in the in-situ monitoring test, the single-beam is used for the topographic survey underwater at random after the foundation excavation. Analysising on the theoretical calculation analysis and the result of in-situ monitoring test, proper slope ratio and over-break depth of pile cap foundation excavation is put forward to provide key construction parameters for the main project of the HZM Bridge.

scholarly journals Stability of a Rock Tunnel Passing through Talus-Like Formations: A Case Study in Southwestern China

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Shaoqiang Zhang ◽  
Wenqiang Li ◽  
Jiashan Tan ◽  
Bokuan Li ◽  
Xiaochang Li ◽  
...  
Keyword(s):  
Rock Mass ◽  
Rock Pressure ◽  
Monitoring Program ◽  
Surrounding Rock ◽  
In Situ Monitoring ◽  
Monitoring Data ◽  
Surrounding Rock Pressure ◽  
Set Up ◽  
Highway Project

Tayi tunnel is one of the component tunnels in the Jian-Ge-Yuan Highway Project located in Yunnan Province, southeast of China. It mainly passes through talus-like formations comprised of rock blocks of diverse sizes and weak interlayers with clayey soils with different fractions. Such a special composition leads to the loose and fractured structure of talus-like formations, which is highly sensitive to the excavation perturbation. Therefore, Tayi tunnel has become the controlled pot of the whole highway project as the construction speed has to be slowed down to reduce the deformation of surrounding talus-like rock mass. To better understand the tunnel-induced ground response and the interaction between the surrounding rock mass and tunnel lining, a comprehensive in situ monitoring program was set up. The in situ monitoring contents included the surrounding rock pressure on the primary lining, the primary lining deformation, and the stress of steel arches. Based on the monitoring data, the temporal and the long-term spatial characteristics of mechanical behavior of surrounding rock mass and lining structure due to the excavation process were analyzed and discussed. It is found that the excavation of lower benches released the surrounding rock pressure around upper benches, resulting in the decrease of the surrounding rock pressure on the primary lining and the stress of steel arches. In addition, the monitoring data revealed that the primary lining sustained bias pressure from the surrounding rock mass, which thereby caused unsymmetrical deformation of the primary lining, in accordance with the monitored displacement data. A dynamically adaptive support system was implemented to strengthen the bearing capacity of the lining system especially in the region of an extremely weak rock mass. After such treatment, the deformation of the primary lining has been well controlled and the construction speed has been considerably enhanced.

The piezoelectric implant: its applications to the in situ monitoring of materials

2001 ◽  
Vol 89 ◽  
pp. 24-26
Author(s):  
Y. Jayet ◽  
J.-C. Baboux
Keyword(s):  
In Situ Monitoring

Fetal pulse oximeter for in situ monitoring during labour and birth

2008 ◽  
Vol 52 (1-2) ◽  
pp. 85
Author(s):  
Ákos Becker ◽  
Gábor Harsányi
Keyword(s):  
Pulse Oximeter ◽  
In Situ Monitoring

scholarly journals Development of an electrochemical sensor for in-situ monitoring of reactive species produced by cold physical plasma

2021 ◽  
Vol 326 ◽  
pp. 129007
Author(s):  
Zahra Nasri ◽  
Giuliana Bruno ◽  
Sander Bekeschus ◽  
Klaus-Dieter Weltmann ◽  
Thomas von Woedtke ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Reactive Species ◽  
In Situ Monitoring ◽  
Physical Plasma

In Situ Monitoring of Polaron Localization and Cell Activity with Charge Accumulation Spectroscopy

2021 ◽  
pp. 2105799
Author(s):  
Yu Zhang ◽  
Li Yang ◽  
Jintao Wang ◽  
Wangying Xu ◽  
Qiming Zeng ◽  
...  
Keyword(s):  
Cell Activity ◽  
In Situ Monitoring ◽  
Charge Accumulation
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