Goin’ Back Home

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Completed four finals: Diff. Eq. (neutral, leaning towards bad), Waves and Quantum Mechanics (great final), Organic Chemistry (I got pwned by this badly), Chinese (easy sailing). Also completed a research paper below this post. Finally, I get to go back home…

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Analyzing the Effectiveness of Brita® Water Filters

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This was my final paper for my independent research project in a laboratory class, Ch 15, at Caltech. I’m currently in finals week so I have about 4 finals to take and 1 more assignment to finish.

Abstract:

Brita(R) water filters are popular personal and home water filtration systems that claim to reduce, among many impurities, the concentration of copper in tap water by at least 74% and chlorine by at least 94%. These claims and the performance of the filters were tested by filtering residential tap water and then collecting filtrated samples at various points along the filtration process up to 40 gallons (Brita(R) ’s claim of the filter’s lifespan). By using mercury electrode differential pulse cyclic voltammetry and uv-vis spectrometry (on DPD colorimetric reaction), the concentrations of copper and chlorine, respectively, were determined in unfiltrated and filtrated tap water. The results showed that there was an average of 36.10% +/- 2.43% reduction of copper and 72.49% +/- 0.03% reduction of chlorine throughout the 151 L (40 gallons) filtering of the Brita(R) water filter. There was also a detectable difference (5.48% change for copper and 17.12% change for chlorine), albeit small, between new filters and filters due to be replaced after 151 L. Under real world usage of the Brita(R) water filter (and not in prepared laboratory samples), Brita(R) ’s claims about percent reduction are overestimated by ~43% for copper and 13% for chlorine.

Full Paper: Analyzing the Effectiveness of Brita® Water Filters (PDF, 565 KB).

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My SURF Presentation in Video Form

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I’m still alive…just in finals week at Caltech. I managed to obtain a digital copy of my SURF presentation from last month thanks to Eric Tai so I uploaded it to Google Video:
Enhancing conductivities in (porphyinato)metal based materials with alkyl-ethylene glyco substituents, SURF 2006 (Caltech) Presentation

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Got my Tablet PC Back

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I got my tablet PC back today and it’s awesome again. No more messing around with paper and pencil :).

A solution, maybe

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“Two weeks” will the be time until I get my computer back, according the Toshiba service representative. Noooooo! My Tablet PC is like essential to my education. It’s great to be able to take clean notes and write up problem sets without the constraint of paper. Also, I set up my computer in a good way to maximize my productivity (minus the procrastinations caused by the computer).

*Sigh*

Toshiba will most likely end up reformatting my hard drive, so I spent a lot of today running around trying to get someone to help me back up the data. The problem was that my laptop’s hard drive has an SATA (15-pin) connector which isn’t that common yet. The cool thing was that I sent an email out to my house and a lot of people responded offering to help. However, not everyone had the solution I needed. I’m going to try to work with a few people tomorrow to get my data backed up (Luckily, I made backups last month. However, I’d still like to have my recent data).

But what in the meanwhile? Fortunately, Eric T. (previously mentioned on this blog) had haphazardly put together a computer that was sitting in the corner of the computer lab unused since it still had to be polished up with software and some hardware tweaks. So I managed to “borrow” the computer for a while to tweak it up while at the same time using it for my own purposes. Once I get my laptop shipped back, this desktop machine will be be gloriously returned to the computer lab with perfectly configured software :).

So anyway, just when I was about to get back on schedule after a tough midterms week (or two), this laptop problem suddenly pushed me behind schedule again. That means I must get to work now…

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Laptop Died

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Eh, my Tecra M4 tablet pc just died on me today with motherboard/graphics card problems. Unfortunately, I have to send my laptop in to get it fixed which will probably take a little over a week from what I heard. Therefore, the next week will probably be really tough for me and I probably won’t be online as much.

I’m still alive…

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I suppose I have to post something. Sorry to my lack of writing these days. I’m still alive though, but as busy as hell. This week I have about 8 big assignments to complete in the span of 4-5 days. I had to give my SURF presentation today, and I was losing a lot of sleep these past days trying to put the presentation together. Clocking about 60 slides, I think I managed to pull the presentation off well despite finishing the slides only about an hour before the real deal.

Since I kind of promised someone that I wouldn’t procrastinate as much this year, I’ve been trying to keep on schedule as much as possible which meant a complete neglect of this blog. Needless to say, I’m still thinking so I’m still existing.

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Electric cart hack and salvaging computers

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One of my friends in Avery is Eric Tai, and he’s pretty into computer hardware. Caltech dumps a lot of electronics sometimes, and Eric usually tries to salvage things from the dumpsters. Surprisingly, he’s pretty successful. For instance, there were these series of 21-in. Sony Trintion flat screen (not LCD though) monitors that were thrown out because the display on the screens were too light and distorted. Eric thought this was weird and did some research online. He found this hack to flash the EEPROM of the monitors and correct the display. So he suddenly had 3 really good 21-in. monitors…

Anyway, he convinced me to go on a salvaging trip today. We couldn’t find any spare shopping carts so I suddenly thought of the electric cart in the basement of Avery house. We were pretty happy about the thought of driving around computer equipment instead of carrying it across campus (big monitors weigh a lot!). However, when we were just about to leave, the cart disappointingly didn’t budge: we needed a key! I was about to give up, but Eric started using his mail key which I thought: That couldn’t possibly work! But it did! Eric got the lock to turn, but it didn’t hold. I got out my key, and by “bumping” the key around while turning, I managed to open the lock! Eric and I were estatic: who would have thought our measly mail keys would start the electric cart?

To make a long story short: We picked up another monitor and two motherboards with dual Pentium III (733Mhz) processors. Then we spent most of the Saturday night in the Avery computer lab trying to piece together two Frankensteinish computers with components from older computers and from components that Eric had previous procured. We were working on separate PIII systems so it was kind of like a competition. I had my system up and running, and I was just about to install Windows in the hard drive when the power supply died on me. So Eric was able to win :).

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Back at Caltech

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Well, what can I say? I’m back in this weird school. I arrived here yesterday after a combined total of 11 hours of travelling. Since I got the biggest double in Avery (the house I’m living in), I was trying to move around furniture so that my bed doesn’t sit on top of my desk (it’s one of those college furniture things). But alas, after moving furniture around for like 3 hours trying 3 configurations, I finally gave up and went back to something very similar to the original configuration of the room. I was kind of mad at myself for creating an ironic situation.

My roommate isn’t back yet so I get free reign of the room. One cool thing was that since my room is so big, the Avery house LCD projector was dumped into my room. I have this nice big white wall in my room… Can anyone say: “Big screen DVDs?!” If I had a couch in my room, it’d be like movie night in my room every week.

I went to Target to buy lots of stuff today. It was actually farther than I remembered. Some of my textbooks are in limbo since Caltech forwarded them to my house after I had them shipped to Caltech. Finally, I still have to put together a rough draft of my final SURF research paper before Saturday.

I’m going to try to adhere to my promise of putting academic work in high priority (over procrastination which used to override everything). Therefore, I will go work on the paper.

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Simple Asides Fixed for WP 2.0.4

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Spent some time today fixing my Simple Asides plugin for the latest version of Wordpress, 2.0.4. It seems like there were some changes in the way that the functions of my plugin were called by wordpress. Therefore, I had to move a few variables around. The code is still pretty ugly and unelegant though.

Download/upgrade the plugin on the Simple Asides page. Sorry it took so long to fix.