xxgreg

6 ms·

1.
by xxgreg 2y ago
Don't use floats if you're trying to represent an exact value, i.e. someones bank account. But in financial modelling you're generally dealing in probabilistic "expected values", it's common and fine to use flo
2.
by xxgreg 5y ago
If given a question about reversing a string, it lets you ask the interviewer questions like: * Do you want to do it in-place or as a copy? * Is it an ASCII or Unicode string? If using Unicode, I assume you want to reverse on grapheme clust
3.
by xxgreg 5y ago
Thanks for taking the time to write these comments. In my opinion, existing tech is able to solve the climate crisis. Breakthroughs can make the solution cheaper and sooner. In my view the main problem is the attitude of doom amongst the ge
4.
by xxgreg 5y ago
The cause is a political battle with Putin over gas. Russia has traditionally used gas contracts with individual countries to buy political influence. Now the EU has a single gas market, and had upgraded pipelines to be used in reverse dire
5.
by xxgreg 5y ago
Primary energy consumption isn't a great metric for comparing with renewable electricity, since for conventional plants it includes the unused energy lost as heat. A fossil power plant wastes ~60% of the energy, a nuclear plant ~75%, a
6.
by xxgreg 5y ago
There's also ongoing work to build a dependency vulnerability database. This is proposed to be surfaced via a built in `go audit` command. https://go.googlesource.com/proposal/+/master/design/draft-v
7.
by xxgreg 5y ago
hmmm interesting - here's an article. https://qz.com/2004569/the-global-chip-shortage-can-be-expla...
8.
by xxgreg 5y ago
All of the car companies, dialed down orders at the start of the pandemic. Now they are all trying to stockpile chips, due to not enough supply. I imagine (no data to support) the increased size stockpiles are a large part of what makes the
9.
by xxgreg 5y ago
Travel was open with Australia until the recent outbreak there. Using virus genome sequencing, this outbreak has been traced to a New Zealander who caught the virus in Sydney, and spent 2 weeks in a quarantine centre in Auckland. It's
10.
by xxgreg 5y ago
There's also ongoing development on "starnix" which aims to run unmodified Linux binaries.
11.
by xxgreg 5y ago
I hope France finds a path forward. Last I read it's sitting on an aging fleet of reactors, and failing to build new ones in a timely manner. The big German power companies definitely have a lot to answer for. At least there is now an
12.
by xxgreg 5y ago
Where is the big increase in coal? If you look at the stats coal use is down. https://www.cleanenergywire.org/sites/default/files/styles/g... What is not well known in the Anglosphere is that the German
13.
by xxgreg 6y ago
NZ Crayfish are called Rock Lobster in the US. http://www.leefishusa.com/products/lobster/spiny
14.
by xxgreg 7y ago
It is phrased this way because the changing climate is what negatively affects civilization. While it is an energy imbalance which causes the climate to change, modifying the energy input or output via geoengineering will also cause the cli
15.
by xxgreg 7y ago
Pedantic answer... You could start at 0 Kelvin. https://en.wikipedia.org/wiki/Absolute_zero
16.
by xxgreg 7y ago
China has piloted a number of carbon pricing schemes since 2013. It is introducing a nationwide scheme this year. https://www.reuters.com/article/climate-change-china-idUSL3N...
17.
by xxgreg 7y ago
"An autopilot is a system used to control the trajectory of an aircraft, marine craft or spacecraft without constant manual control by a human operator being required. Autopilots do not replace human operators, but instead they assist
18.
by xxgreg 7y ago
Another chart... Note some stats are percentage of consumption, others are percentage of generation. These differ due to imports and exports. https://www.cleanenergywire.org/sites/default/files/styles/g..
19.
by xxgreg 7y ago
This assumes that the nuclear reactors could ramp up and down on a daily basis. Germany's reactors weren't capable of load following to the extent required. In fact brokdorf was taken offline early due to a failure during a load f
20.
by xxgreg 7y ago
Most of Japan's electricity is from imported LNG, so doesn't make much difference to independence. They already import this energy.
21.
by xxgreg 7y ago
You can convert electricity, water and CO2 to fuels, such as hydrogen and natgas. These fuels can then be transported. There are significant energy losses if all you want on the other end is electricity. But not so bad if you're burnin
22.
by xxgreg 7y ago
Phrase it how you will, but this chart shows it clearly. https://www.cleanenergywire.org/sites/default/files/styles/g...
23.
by xxgreg 7y ago
The same thing did not happen in Germany. The increase in renewables more than made up for the decrease in nuclear. https://www.cleanenergywire.org/sites/default/files/styles/g... Also interesting, betwe
24.
by xxgreg 7y ago
Many European gas systems were designed for town gas, produced from coal. This has a significant hydrogen component. So these systems can accommodate something like 15% hydrogen. There are also a number of existing hydrogen pipelines in ope
25.
by xxgreg 7y ago
There is already a lot hydrogen use by German industry. Including a 240km pipeline built and in operation since the 30s. The first step will be replacing hydrogen from fossil sources with renewable. This also provides industry which cannot
26.
by xxgreg 7y ago
Yes - the article states that electricity is more efficiently used directly. Hydrogen is valuable for other processes such producing steel, high temperature heat, and chemicals. German industry already uses large amounts of hydrogen produce
27.
by xxgreg 7y ago
The data paints a different picture. https://www.cleanenergywire.org/sites/default/files/styles/g... https://www.cleanenergywire.org/sites/default/files/styles/g...
28.
by xxgreg 7y ago
I disagree. This looks entirely achievable if existing trends continue. https://www.cleanenergywire.org/sites/default/files/styles/g...
29.
by xxgreg 7y ago
Regarding the Greens. They will be more willing to push back against the German car industry which should lead to increased reductions in transport emissions. Other sectors are likely similar.
30.
by xxgreg 7y ago
Wind and solar, plus the already existing 6gw of pumped storage and increased curtailment gets you to 80 percent. The remaining 20 percent requires more storage. Batteries can help to some extent for shifting day to day peaks. Seasonal stor

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