How Groundwater Extraction & Replenishing Causes Surface Deformation & Subsidence

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Researchers at Caltech made the animations below which show the seasonal deformation and subsidence of Earth’s surface, respectively,  as a result of groundwater extraction and refilling.

Surface deformation and subsidence of Earth’s surface is measured using Interferometric Synthetic Aperture Radar (ISAR). ISAR is also used for natural hazard assessment. This includes applications to regions of volcanic, tectonic (e.g. faults and mountains), and construction activities.

 

source: Caltech

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Research Proposal Writing

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Research Proposal Writing for Business, Social Sciences and Humanities covers some good material:

 

Handy Bash Commands

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A few commands I use frequently but sometimes forget.

Concatenate mutliple PDF files

pdftk *.pdf cat output out.pdf

Convert a PDF page to an image

convert -density 150 input.pdf -quality 90 output.png

Batch resize images

mogrify -resize 640x480 *.{png|jpeg}

Crop an image

convert input.png -crop 0x4000 output.png

Create a GIF animation from images (10s delay, loop endlessly)

convert -delay 10 -loop 0 *.png animation.gif

Training a Neural Network to detect Oil Spills in Synthetic Aperture Radar Satellite Images

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Python

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Intermediate and Advanced Software Carpentry

Problem Solving with Algorithms and Data Structures using Python

 

Vim casts

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Vim Screencasts – vimcasts.org from Drew Neil the author of Practical Vim.

Heisenberg’s Uncertainty Principle by Dr. Walter Lewin

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A reminder of the basics of quantum mechanics.

An atom is all vacuum. You and I are all vacuum. You think of yourself of being something but we are nothing.