Nanostructure Growth Supported by In Situ RHEED Evaluation

2017 ◽  
Vol 885 ◽  
pp. 234-238
Author(s):  
Péter Kucsera ◽  
Tamás Sándor ◽  
Gusztáv Varga Tényi ◽  
Márton Csutorás ◽  
Gergely Bátori ◽  
...  
Keyword(s):  
Growth Kinetics ◽  
In Situ Monitoring ◽  
Nanostructure Formation

The in-situ monitoring of the MBE grown nanostructures can be carried out using the RHEED method. During the droplet epitaxal growth, the observation of the nanostructure formation is very important to understand the growth kinetics. In the present work, a novel in-situ RHEED evaluation and further MBE related developments are introduced, with which the quality of the nanostructure preparation can be improved.

scholarly journals Stability Assessment of Mining Excavations: the Impact of Large Depths

2018 ◽  
Vol 40 (3) ◽  
pp. 180-187
Author(s):  
Tadeusz Majcherczyk ◽  
Zbigniew Niedbalski ◽  
Łukasz Bednarek
Keyword(s):  
Rock Mass ◽  
In Situ Monitoring ◽  
Stability Assessment ◽  
Underground Excavations ◽  
Deformation Prediction ◽  
Large Depth ◽  
Coal Deposits ◽  
The Impact

AbstractBack in the early 1980s, coal deposits occurring at depths of ~700 m below surface were already regarded as large-depth deposits. Meanwhile, today the borderline depth of large-depth mining has extended to >1,000 m. Design, excavation and maintenance of mining roadways at the depth of >1,000 m have, therefore, become crucial issues in a practical perspective in recent years. Hence, it is now extremely important to intensify research studies on the influence of large depths on the behaviour of rock mass and deformation of support in underground excavations. The paper presents the results of the study carried out in five mining excavations at depths ranging from 950 to 1,290 m, where monitoring stations with measurement equipment were built. The analysis of data from laboratory and coal mine tests, as well as in situ monitoring, helped to formulate a set of criteria for stability assessment of underground excavations situated at large depths. The proposed methodology of load and deformation prediction in support systems of the excavations unaffected by exploitation is based on the criteria referring to the depth of excavation and the quality of rock mass. The depth parameter is determined by checking whether the analysed excavation lies below the critical depth, whereas the rock mass quality is determined on the basis of the roof lithology index (WL) and the crack intensity factor (n)

Online Prediction and Verification of Cured Quality of Advanced Composites in Autoclave Process

2016 ◽  
Vol 703 ◽  
pp. 3-10
Author(s):  
Yong An Zhang ◽  
Li Hua Zhan
Keyword(s):  
In Situ Monitoring ◽  
Metallographic Analysis ◽  
Resin Flow ◽  
Composite Part ◽  
Monitoring Method ◽  
Verification Method ◽  
Part Quality ◽  
Ultrasonic Phased Array

The strain in curing process of composite part would be influenced by curing compaction, resin flow, curing action and tool-part interaction, meanwhile these factors would also influence the final cured quality of composite part. In this paper, FBG(fiber Bragg grating) sensors are used to in-situ monitoring the strain of composite parts, which are cured in four different pressure situation by autoclave: 0.0Mpa,0.2Mpa,0.4Mpa,0.6MPa. by analyzing the strain change rule, the part quality is predicted, then the predictive result is compared with some verification method: measurement of part’s boundary dimension, ultrasonic phased array scanning, metallographic analysis. The result shows that, the prediction is consistent with verification, the in-situ monitoring method by using FBG sensor is available for predicting cured quality of composite parts accurately: increase curing pressure is benefit of part compaction, resin flow, and reduce delamination,pores in composite part, finally improving the part quality dramatically.

scholarly journals In Situ Monitoring of Nanostructure Formation during the Digestion of Mayonnaise

ACS Omega ◽  
2017 ◽  
Vol 2 (4) ◽  
pp. 1441-1446 ◽  
Author(s):  
Stefan Salentinig ◽  
Heinz Amenitsch ◽  
Anan Yaghmur
Keyword(s):  
In Situ Monitoring ◽  
Nanostructure Formation

An Accurate and Quick Measuring Method for Mix Proportion of Concrete Paste in Construction Site

2010 ◽  
Vol 450 ◽  
pp. 482-485
Author(s):  
Li Peng Cai ◽  
Ii Young Jang ◽  
Ying Wei Yun ◽  
Seong Kyum Kim
Keyword(s):  
Setting Time ◽  
Measuring Method ◽  
In Situ Monitoring ◽  
Construction Site ◽  
Monitoring Method ◽  
Initial Setting Time ◽  
Mix Proportion ◽  
Initial Setting

An effective in-situ monitoring method for MPCP is urgently needed in civil engineering field. In this research, a quick and accurate in-situ measuring method for mix proportion of concrete is put forward. This method can succeed in measuring real mix proportion of any concrete paste precisely within 20 minutes according to four parameters of concrete before initial setting time of concrete. By comparing the designed mix proportion of concrete with the real measured one in construction site by this method, the quality of concrete can be demonstrated. This method can evaluate the reliability of mix proportion for real concrete in construction site quickly and precisely, and ensure the quality of concrete structures to avoid the occurrence of engineering accidents.

scholarly journals In Situ Monitoring of the Long-Term Settlement of High-Fill Subgrade

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Liang Jia ◽  
Jian Guo ◽  
Kai Yao
Keyword(s):  
Service Quality ◽  
Significant Role ◽  
Single Point ◽  
Exponential Model ◽  
In Situ Monitoring ◽  
The Road ◽  
Vehicle Loads

Monitoring the settlement of high-fill subgrade plays a significant role in maintaining the service quality of highways. To investigate the postconstruction settlement of high-fill subgrade under gravity stress and vehicle loads, in situ monitoring was carried out on the Lanzhou-Yongjing highway. Single-point settlement meters were buried in various depths under the driveway and road shoulder. The evolution of settlement with time and space was analyzed. The results show that the settlement of the road shoulder is greater than that of the driveway; the settlement of the subgrade increases with time and tends to be stable after 1 year; the vehicle loads have no big effect on the settlement of the subgrade; the exponential model can be adopted to predict the settlement of the Lanzhou-Yongjing highway accurately.

In Situ Monitoring of Laser-Assisted Hydrothermal Growth of ZnO Nanowires: Thermally Deactivating Growth Kinetics

Small ◽  
2013 ◽  
Vol 10 (4) ◽  
pp. 741-749 ◽  
Author(s):  
Jung Bin In ◽  
Hyuk-Jun Kwon ◽  
Daeho Lee ◽  
Seung Hwan Ko ◽  
Costas P. Grigoropoulos
Keyword(s):  
Growth Kinetics ◽  
Zno Nanowires ◽  
Hydrothermal Growth ◽  
In Situ Monitoring

Mombe Growth of Ybco Superconducting Films With In-Situ Monitoring of Rheed Oscillations

1993 ◽  
Vol 334 ◽  
Author(s):  
K. Endo ◽  
F. Hosseini Teherani ◽  
S. Yoshida ◽  
K. Kajimura ◽  
Y. Moriyasu
Keyword(s):  
Superconducting Films ◽  
Unit Cell ◽  
In Situ Monitoring ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
Dimensional Unit ◽  
Ybco Superconducting Films

AbstractWe have succeeded in in-situ growth of YBCO superconducting films by developing a new MOMBE technique which employs in-situ monitoring of RHEED intensity. The X-ray diffraction pattern showed peaks corresponding to those calculated from the Laue function which indicates the high quality of films grown using MOMBE. AFM and RHEED oscillations show 2-dimensional unit cell by unit cell growth.

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