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Capacitive Pressure Sensor (silicon diaphragm)

3 December, 2020 No comments

I replicated Figure 7 of the paper “Static response of miniature capacitive pressure sensors with square or rectangular silicon diaphragm” by G. Blasquez, Y. Naciri, P. Blondel, N. Ben Moussa and P. Pons. We can conclude from the figure that square sensors are more sensitive devices.

Response of square and rectangular sensors

Square/Rectangular capacitive sensor response Square/Rectangular capacitive sensor response
Figure by LauraMabel Figure from the paper
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Numerical first derivative using different methods

I numerically computed the first derivative of the following function at interior points using different methods, in an uniform grid of points. Also, I found the average of the absolute error of the predicted first derivative for all the interior points, providing the best prediction.

f(x)=sin[(4-x)(4+x)], 0 <= x <= 8
Numerical methods used:

  • Piecewise quadratic spline functions that represent the function
  • 1st order forward scheme
  • 2nd central difference
  • Padé approximation

Plot of results for each approach along with the exact solution.

Numerical Derivative - Laura Almara. Numerical Derivative Errors by Almara

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Two-dimensional (2D) Burgers equation derivation

26 November, 2020 No comments

I made the following derivation of the two-dimensional (2D) Burgers equation, which is a non-linear model of the convection-diffusion process.

Burgess equation 1 - Laura Almara Burgess equation 3 - Laura Almara

Burgess equation 2 - Laura Almara Burgess equation 4 - Laura Almara

The discretized derivation is done using the second-order central difference (CD) for the spatial derivatives, and Crank-Nicolson (CN) for the time advancement. CN method combine the stability of an implicit method with the accuracy of a method that is second-order both in space and in time, and is achieved by averaging explicit FTCS (Forward-Time-Centered-Space) and implicit BTCS (Backward in Time, Centered in Space) schemes.

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Effective Thermal Conductivity of Film Copper vs. Knudsen number

10 April, 2020 No comments
Effective Thermal Conductivity of Film Copper vs. Knudsen number - Almara Effective Thermal Conductivity of Film Copper vs. Knudsen number - Paper
Figure by LauraMabel Figure from the book

I calculated of the thermal conductivity along a copper film with various thicknesses: d = 400, 100 and 50 nm at 300 K. This plot illustrates the size dependence of the effective thermal conductivity, using the size-effect effective conductivity based on Kn number and. The obtained plot is very similar to Figure 5.17 of the book “Nano/Microscale Heat Transfer”, Zhuomin M. Zhang, McGraw-Hill, page 175.

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Schneider Go Green North America Semi-Finals Competition 2020

2 April, 2020 No comments

Sneider 2020 Go Green Competence

Won Dallas Go Green North America Semi-Finals Schneider Electric.

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Thermal Conductivity of copper between 200 and 800 K

1 April, 2020 No comments

Copper Thermal Conductivity

I calculated and plotted the thermal conductivity of copper between 200 and 800 K, comparing these results with data from two heat transfer textbook: “Thermal Conductivity of Selected Materials” by U.S. Department of Commerce (Table 4, Page 23), and “Introduction to Heat Transfer” by Bergman Lavine (Table A.1, Page 899).

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Piezoelectric Bimorph Model of Lead Zirconate Titanate (PZT-5H)

9 November, 2019 No comments

Power density vs. frequency for three different impedances ZL

Piezoelectric Bimorhp Model For Zirconate Titanate Piezoelectric Bimorhp Model For Zirconate Titanate
Figure by LauraMabel Figure from the paper

I replicated Figure 2 of the paper “Performance of a piezoelectric bimorph for scavenging vibration energy” by Shunong Jiang, Xianfang Li, Shaohua Guo, Yuantai Hu, Jiashi Yang and Qing Jiang.

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3D Modeling

10 March, 2018 No comments

I created this 3D factory model to calculate illumination. The software is DIAlux EVO.

As the results have to be similar to reality, every aspect of the workplace was included.

This made the whole project a challenge, though the results were as expected.

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