#family: me and my grandpa


image from: http://davesmechanicalpencils.blogspot.com.au/2008/05/mgm-plus-200-mechanical-pencil.html

at many times you just don’t know how you miss somebody so much


Just how much do you think you know about your grandfather. I am the oldest grandson so I get to see him more than my younger brothers and sister.

mechanic pencil

Yupe it was one thing that I got from my GP. He introduced me to one. It was a very old model of mechanical pencil. The refill was unlike the thin one that we can find easily in the book store. It was like we have to “butcher” a conventional pencil, peal off the wood casing and take out the black carbon stick inside it, then use it as the refill. Actually now they, as in specialized book store, sell the refill with many colors.

Radio Australia

I can’t remember the Mhz of it but I do remember that it was on SW band. I remember the “waltzing mathilda” song everyday at 4.30 in the morning, gracefully sounded from the old radio. They broadcasted news, variety light informations, and English lesson. The broadcast was up and down depends on the weather.

Young Guns

He really likes cowboy movies. He introduced me to John Wayne character, Bonanza, etc. I actually took him to both Young Guns movies, so he knew Emilio Estevez back then.


He used to ride red 1960’s Vespa and a white 1980’s Mitsubishi Minicab. Didn’t know much about it since I was still a small kid back then. They look like the following borrowed-images from:





About the author

My current focus is how to provide the hydrostratigraphy of volcanic aquifers in Bandung area. The research is based on environmental isotope measurement in groundwater and morphometry. My work consists of hydrochemical measurements. I am using multivariate statistical methods to provides more quantitative foundation for the analysis and more insight into the groundwater behavior, especially its interaction with surface water. I use open source apps like R and Python to do the job. In my spare time, I also have a side project to promote open science in Indonesia's research workflow. One of my current focus is promoting INARxiv, as the first preprint server of Indonesia (osf.io/preprints/inarxiv) and serving as ORCID and OSF (osf.io) ambassador. Research interest: Hydrochemistry, multivariate analysis, and R programming. Blog: dasaptaerwin.net, derwinirawan.wordpress.com. (https://orcid.org/0000-0002-1526-0863)