Age determination of nephrite by in-situ SIMS U–Pb dating syngenetic titanite: A case study of the nephrite deposit from Luanchuan, Henan, China

Lithos ◽  
2015 ◽  
Vol 220-223 ◽  
pp. 289-299 ◽  
Author(s):  
Xiao-Xiao Ling ◽  
Esther Schmädicke ◽  
Qiu-Li Li ◽  
Jürgen Gose ◽  
Rui-Hua Wu ◽  
...  
Keyword(s):  
Age Determination

scholarly journals Dating minerals by ID-TIMS geochronology at times of in situ analysis: selected case studies from the CPGeo-IGc-USP laboratory

2009 ◽  
Vol 81 (1) ◽  
pp. 73-97 ◽  
Author(s):  
Cláudia R. Passarelli ◽  
Miguel A.S. Basei ◽  
Oswaldo Siga Jr. ◽  
Kei Sato ◽  
Walter M. Sproesser ◽  
...  
Keyword(s):  
Thermal Ionization Mass Spectrometry ◽  
Age Determination ◽  
Isotopic Dilution ◽  
Ionization Mass ◽  
System Behavior ◽  
Rock Types ◽  
Geological Processes ◽  
Thermal Ionization Mass

Since 1964, the Center for Geochronological Research - CPGeo, one of the interdepartmental centers of the Instituto de Geociências (IG) of São Paulo University, has developed studies related to several geological processes associated with different rock types. Thermal Ionization Mass Spectrometry Isotopic Dilution (ID-TIMS) has been the technique widely used in the CPGeo U-Pb Laboratory. It provides reliable and accurate results in age determination of superposed events. However, the open-system behavior such as Pb-loss, the inheritance problem and metamictization processes allow and impel us to a much richer understanding of the power and limitations of U-Pb geochronology and thermochronology. In this article, we present the current methodology used at the CPGeo-IGc-USP U-Pb laboratory, the improvements on ID-TIMS method, and report high-precision U-Pb data from zircon, monazite, epidote, titanite, baddeleyite and rutile from different rock types of several domains of the Brazilian south-southeast area, Argentina and Uruguay.

Stability analysis of mobile cranes and determination of outriggers loading

2018 ◽  
Vol 16 (6) ◽  
pp. 938-958 ◽  
Author(s):  
Giuseppe Romanello
Keyword(s):  
Stability Margin ◽  
Content Type ◽  
Stability Behavior ◽  
Mobile Crane ◽  
Computer Codes ◽  
The Stability ◽  
Practical Implications

Purpose The purpose of this paper is to develop mathematical tools that are reliable and easily implementable in computer codes, which address the determination of the outriggers reaction of mobile cranes and the monitoring of the actual stability margin available during lift operations. Design/methodology/approach An algorithm that determines the load transmitted to the ground by a mobile crane with four outriggers has been developed. Static theory of rigid body is adopted for the development of the algorithm and the static indeterminancy, due to the presence of more than three outriggers, is eluded through the adoption of specific hypotheses. An analysis of crane stability is also performed, and a method to monitor the actual stability behavior during lift operations is suggested. Findings A case study is proposed to test the algorithm and outcomes show a good matching with the actual outriggers reaction measured during a test conduct in situ. Two indices are introduced as a measure of the stability margin. Research limitations/implications The method developed accounts only for gravitational forces statically applied. Future works should be addressed to extend the model to the effect of wind and inertial forces. Practical implications This paper supplies a reliable tool to assess, in the design phase of a lifting operation, the compliance between bearing capacity of the ground and loads transmitted by outriggers. The method proposed for the analysis of the stability behavior is suitable for the development of an anti-upset device. Originality/value This study contributes to efforts to increase safety during lifting operations with mobile cranes. The method proposed is applicable to cranes with any geometry of the outriggers pattern and is extensible to a number of outriggers greater than four. Furthermore, the evaluation of the measure in real time of the stability margin, is not affected by the data entered by the crane’s operator with the consequence that human factor does not affect this measure.

Keys to Success in Determination of In-Situ Petrophysical Properties of Unconsolidated Sands by Traced-Coring: A Case Study

2017 ◽  
Author(s):  
Siti Najmi Farhan Zulkipli ◽  
Michael Mehmet Altunbay ◽  
Gamal Ragab Gaafar ◽  
Jamari M. Shah
Keyword(s):  
Petrophysical Properties ◽  
Unconsolidated Sands

Determination of Critical In-situ Stress Parameter for future well placement: An Integrated case study from C-Series Fields of Tapti-Daman block, Mumbai offshore, India.

2010 ◽  
Author(s):  
Sarvagy Parashar ◽  
Koushik Sikdar ◽  
Dipanka Behari Roy ◽  
Chandramani Shrivastava ◽  
Vasant Balkrishna Kumbhar ◽  
...  
Keyword(s):  
In Situ Stress ◽  
Well Placement ◽  
Stress Parameter

scholarly journals Determination of stress state in deep subsea formation by combination of hydraulic fracturing in situ test and core analysis: A case study in the IODP Expedition 319

2013 ◽  
Vol 118 (3) ◽  
pp. 1203-1215 ◽  
Author(s):  
Takatoshi Ito ◽  
Akio Funato ◽  
Weiren Lin ◽  
Mai-Linh Doan ◽  
David F. Boutt ◽  
...  
Keyword(s):  
Stress State ◽  
Hydraulic Fracturing ◽  
Core Analysis ◽  
In Situ Test

In Situ Determination of the Reduction Levels of Cytochromes b and c in Growing Bacteria: A Case Study with N2-Fixing Azorhizobium caulinodans

1993 ◽  
Vol 214 (1) ◽  
pp. 149-155 ◽  
Author(s):  
A.F. Pronk ◽  
F.C. Boogerd ◽  
C. Stoof ◽  
L.F. Oltmann ◽  
A.H. Stouthamer ◽  
...  
Keyword(s):  
Azorhizobium Caulinodans

scholarly journals Evaluation of Hypoplastic Clay Model for Deep Excavation Modelling

2016 ◽  
Vol 62 (4) ◽  
Author(s):  
M. Mitew-Czajewska
Keyword(s):  
Accurate Determination ◽  
Deep Excavation ◽  
Element Analysis ◽  
Clay Model ◽  
Modified Cam Clay ◽  
Vertical Displacements ◽  
Cam Clay

AbstractThis paper presents an evaluation of the Hypoplastic Clay constitutive model for finite element analysis of deep excavations and displacements induced by excavations in the influence zone. A detailed description and formulation of the Hypoplastic Clay soil model is included. A parametric case study of a deep excavation executed in Pliocene clays is presented. FE analysis was performed using several soil models (Mohr-Coulomb, Modified Mohr-Coulomb, Drucker-Prager, Modified Cam-Clay, Hypoplastic Clay) and the results were compared to in-situ displacements measurements taken during construction. Final conclusions concerning the suitability of the Hypoplastic Clay model for deep excavation modelling in terms of accurate determination of horizontal displacements of the excavation wall, the uplift of the bottom of excavation, and, most importantly, vertical displacements of the terrain in the vicinity of the excavation are presented.

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