Robustness Analysis and Key Element Determination of Framed Structures

2014 ◽  
Author(s):  
Nan Xiao ◽  
Hai-Lei Zhan ◽  
Hua-Peng Chen
Keyword(s):  
Robustness Analysis ◽  
Element Determination ◽  
Framed Structures

Optimal Robust Fixture Configuration Design Using Computer Experiment

Manufacturing ◽  
2003 ◽  
Author(s):  
L. Shelley Xie ◽  
Agus Sudjianto
Keyword(s):  
Evaluation Method ◽  
Robustness Analysis ◽  
Optimal Solution ◽  
Computer Experiment ◽  
System Response ◽  
New Approach ◽  
New Information ◽  
Reliability Method ◽  
Fixture Configuration

A new FEA based design approach of optimal robust fixture configuration is proposed in this paper, which employs a surrogate model through computer experiment to significantly reduce the intensive computing effort involving numerous FEA system response evaluations. The effects of the fixture variability to the workpiece performance variability are assessed through an efficient robustness evaluation method, First Order Reliability Method (FORM), based on the surrogate computer model. Not restricted to primary datum surface, this new approach enables simultaneous determination of robust locator/clamp locations and clamping forces for a deformable workpiece and thus captures interaction between locating and clamping. The effectiveness of this approach is illustrated though an application example. The results of robustness analysis reveal new information and suggest that the optimal solution resulted from deterministic optimization may not be the best solution when the design is subjected to variability.

Finite element determination of the forces exerted by endotracheal tubes on the upper airways

Biomaterials ◽  
1996 ◽  
Vol 17 (12) ◽  
pp. 1219-1225 ◽  
Author(s):  
B. Gustin ◽  
C. G'Sell ◽  
B. Cochelin ◽  
P. Wourms ◽  
M. Potier-Ferry
Keyword(s):  
Finite Element ◽  
Upper Airways ◽  
Element Determination ◽  
Endotracheal Tubes

scholarly journals MULTI-ELEMENT DETERMINATION OF CALCIUM, POTASSIUM AND MAGNESIUM IN MEDICINAL PLANT BY HIGH-RESOLUTION CONTINUUM SOURCE ATOMIC ABSORPTION SPECTROMETRY

2017 ◽  
Vol 37 (1) ◽  
pp. 45
Author(s):  
Tiago Varão Silva ◽  
Jardes Figuerêdo Rêgo ◽  
Mercedes De Moraes ◽  
Alberto José Cavalheiro ◽  
José Anchieta Gomes Neto ◽  
...  
Keyword(s):  
High Resolution ◽  
Medicinal Plants ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Element Determination ◽  
Continuum Source ◽  
Flame Atomic Absorption ◽  
Secondary Line

A simple and rugged method to determine Ca, K and Mg in a single aliquot of medicinal plants by high-resolution continuum source flame atomic absorption spectrometry is proposed. Secondary lines for Ca (239.856 nm) and K (404.414 nm), and the alternate line measured at wing of the secondary line for Mg at 202.588 nm allowed calibration within the 20 – 500 mg L-1 Ca and K, and 1.0 – 80 mg L-1 Mg. Twenty samples and three plant certified materials were analyzed. Results were in agreement at a 95% confidence level with reference values. Limits of detection were 2.4 mg L-1 Ca, 1.9 mg L-1 K and 0.3 mg L-1 Mg. The RSD (n=12) were ≤ 5.1% and recoveries were between 83 and 108% for all analytes.

scholarly journals SEQUENTIAL MULTI-ELEMENT DETERMINATION OF TRACE-METALS IN BIODIESEL SAMPLES USING HR-CS FAAS

Química Nova ◽  
2020 ◽  
Author(s):  
Alexandre Jesus ◽  
Ariane Zmozinskia ◽  
Diane Laroque ◽  
Márcia Silva
Keyword(s):  
Absorption Spectrometry ◽  
Element Determination ◽  
Continuum Source ◽  
Flame Atomic Absorption ◽  
Student’S T ◽  
Different Sources ◽  
Certified Values ◽  
Good Agreement ◽  
Student’S T Test

In this work the feasibility of sequential multi-element determination of Zn, Fe, Mg, Cu, Na, K, Cr, Al and Ca in biodiesel samples by high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) was investigated. Biodiesel samples obtained from different sources and different chemical processes were analysed. The samples were diluted with n-propanol and water (1.4 mol L-1 HNO3) to form a microemulsion (ME) before its introduction in the HR-CS FAAS using a flow injection mode. The sample B-01 (obtained from soybean oil) was used for optimisation of the instrumental parameters. The accuracy of the proposed method was checked by analysis of certified reference material (CRM) Conostan BDM2A (for K and Na) and BDM2B (for Ca and Mg) and by comparison with acid digestion and recovery tests (for Zn, Fe, Cu, Cr and Al). The obtained results for CRM analysis showed good agreement with certified values within 95% of confidence (Student’s t-test). Recovery tests values ranged from 87-114%. The method developed for the analysis of biodiesel samples is accurate, simple, fast, and suitable for routine application.

Multi-element determination of Pt, Pd and Ir traces in environmental samples by ICP-MS after pre-concentration

Talanta ◽  
2012 ◽  
Vol 99 ◽  
pp. 853-858 ◽  
Author(s):  
Manuel L. Alonso Castillo ◽  
Amparo García de Torres ◽  
Elisa Vereda Alonso ◽  
Ma Teresa Siles Cordero ◽  
José Manuel Cano Pavón
Keyword(s):  
Environmental Samples ◽  
Element Determination ◽  
Icp Ms
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