Analysis and experimental characterization of idle tones in 2nd-order bandpass ΣΔ modulators-a 0.8 μm CMOS switched-current case study

2002 ◽  
Author(s):  
J.M. de la Rosa ◽  
B. Perez-Verdu ◽  
F. Medeiro ◽  
R. del Rio ◽  
A. Rodriguez-Vazquez
Keyword(s):  
Experimental Characterization ◽  
Current Case ◽  
Switched Current

Case study: Experimental characterization of noise and vibration sources in a refrigerator

2021 ◽  
Vol 69 (6) ◽  
pp. 477-489
Author(s):  
Roberto Zárate Espinosa ◽  
Jordi Poblet-Puig ◽  
Martín Ortega Breña ◽  
Marcelo López Parra
Keyword(s):  
Energy Analysis ◽  
Simulation Models ◽  
Acoustic Energy ◽  
Experimental Characterization ◽  
Laboratory Measurements ◽  
Acoustic Intensity ◽  
Noise And Vibration ◽  
Acoustic Design

The sources of noise and vibration of a refrigerator are characterized by means of laboratory measurements. Three different elements are considered: compressor, evaporator fan, and condenser fan. Both the radiated acoustic energy and the mechanical power injected to the refrigerator structure are measured. Acoustic intensity maps on the refrigerator faces at different frequencies are also provided They are helpful in visualizing the more problematic zones in terms of noise emis- sion. The devices are tested in vacuo or working inside the refrigerator. The provided information can be used as input data for vibroacoustic simulation models such as statistical energy analysis. It is also of interest in order to improve the refrigerator acoustic design.

Experimental Characterization of Static Behavior of a New GFRP–Metal Space Truss Deployable Bridge: Comparative Case Study

2021 ◽  
Vol 26 (1) ◽  
pp. 05020011
Author(s):  
Dongdong Zhang ◽  
Jiaxin Yuan ◽  
Feng Li ◽  
Yaru Lv ◽  
Qilin Zhao ◽  
...  
Keyword(s):  
Comparative Case Study ◽  
Experimental Characterization ◽  
Static Behavior ◽  
Space Truss

scholarly journals Multiscale experimental characterization of coatings on ceramics: A case study of tungsten on SiC

2019 ◽  
Vol 367 ◽  
pp. 1-10 ◽  
Author(s):  
Huaxin Li ◽  
Takaaki Koyanagi ◽  
Xunxiang Hu ◽  
Yutai Katoh
Keyword(s):  
Experimental Characterization

scholarly journals Carboxylic acid-capped ruthenium nanoparticles: experimental and theoretical case study with ethanoic acid

Nanoscale ◽  
2019 ◽  
Vol 11 (19) ◽  
pp. 9392-9409 ◽  
Author(s):  
Roberto González-Gómez ◽  
Lucy Cusinato ◽  
Christian Bijani ◽  
Yannick Coppel ◽  
Pierre Lecante ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Surface Chemistry ◽  
Computational Studies ◽  
Experimental Characterization ◽  
Ruthenium Nanoparticles ◽  
Ethanoic Acid

Joint computational studies and full experimental characterization of NPs is a significant plus in order to apprehend their surface chemistry.

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

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