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Prikvačeni tweet
Hello! I'm Amber Hornsby (
@amber_hornsby), an astronomer/physicist based at Cardiff University who is working on next-generation instrumentation for studying cool things like the cosmic microwave background. I'll be taking over astrotweeps this week
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It's almost talk o'clock at the residential and I feel super sick. I've given lots of talks now, but I still get nervous every time. It'll pass once I start talking, but for now it's no funpic.twitter.com/lBfv5FGGFz
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Astrotweeps: Amber proslijedio/la je Tweet
At 2:34 pm PST on Jan. 30, 2020, Spitzer Project Manager Joseph Hunt declared the Spitzer spacecraft decommissioned. Farewell, Spitzer. Thank you for the great science.

#SpitzerFinalVoyagehttps://go.nasa.gov/2vBoaKOHvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
As a grad student, I'm thoroughly enjoying this threadhttps://twitter.com/PixScienceCo/status/1222937879451664385 …
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This is incredible! I've watched this so many timeshttps://twitter.com/DrFunkySpoon/status/1222678477385740289 …
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For me, the most fun aspect is that I participated in this course 4 years ago when I was a final year undergrad. I'm now attending as a final-year undergrad who is giving a "survival guide" talk tomorrow morning. It's weirdly full circle
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The theme is "manufacturing the future" and is based on a real proposal call by the Engineering and Physical Sciences Research Council (EPSRC)
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Although a little intense, this is a really fun trip which teaches students a very important skill. Plus it's in a huge, old house which is beautiful and full of cool stuff.
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The aim of the trip is to work together, with students from 2 other physics departments, to put together a research proposal over 4(ish) days.
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Apologies for going quiet, but it's been a busy few days at work. But, I still have some exciting things to tweet about this week as I've ended up on the undergrad residential trip
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So students measure the voltage in, out and try and work out how much the output lags behind the input. Some wizardry later, and students can extract the value of the capacitance :)
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And the output signal lags behind the input signal. There's a so-called phase difference. As you increase the frequency from 200 to 3000 Hz, the output, blue wave is catching the input signal up and is much closer in amplitude toopic.twitter.com/WiWa4Qvpda
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Students use an oscilloscope to monitor the input signal and the output signal (which is measured across the resistor). Here the input is the yellow wave, and the output is the blue wave. At low frequencies, the amplitude of the output signal is lower than the input...pic.twitter.com/GUGhFEyORs
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Back to the experiment. Students use this signal generator to investigate the RC circuit by changing the frequency of their input signalpic.twitter.com/ZCXOSoKeVT
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And they may not seen obviously useful from an astronomy point of view, but they're often crucial for getting good data from instruments. They can be used to remove unwanted signals created by electrical circuits you might be using to obtain your data - for example.
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But if you use a alternating voltage, then currents can flow on and off the plates. Here low frequency signals struggle, but high frequencies are okay. This is kind of how the filter works.
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Resistors impede current flow in an electrical circuit, and so do capacitors. Sort of. When you apply a constant voltage, charge builds up on the two plates of a capacitor and can't jump the gap between them - it can't flow.
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But, in reality, this is what students are looking at - an orange capacitor and resistor. Top points for identifying the resistance of the resistor from its bands of colour.pic.twitter.com/HFdnfz2VDN
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Shamelessly stolen from the lab manual, here is the circuit diagram for the experiment.pic.twitter.com/WGCdgk5KAE
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So, experiment number 1 - resonance in an electrical circuit. My favourite. Today, students will measure the properties of a high-pass frequency filter, formed of a resistor and capacitor in series, by passing various frequencies through the circuit and seeing how they change
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Good afternoon! Today is the first experimental labs of the new semester at Cardiff. As a PhD demonstrator, I get to supervise two fun experiments - resonance in an electrical circuit and resistance vs. temperature
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