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cphajduk

120 karma · joined March 25, 2018

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cphajduk··on The story of titanium
The article may be an oversimplification, but your comment is an equal oversimplification. There are many environmental conditions that need to be assumed when comparing reactivity.

For instance, if you have pure Titanium, pure Magnesium, pure aluminum in a vacuum at room temperature and proceed to introduce oxygen, you get the following reactions (simplified elemental chemical reactions, the Enthalpy of formation is what is important here):

Ti + O2 -> TiO2 (Std. Enthalpy of formation is -945kJ/mol)

Mg + O -> MgO (Std. Enthalpy of formation is -601kJ/mol)

4Al + 3O2 -> 2 Al2O3 (Std. Enthalpy of formation is -1675kJ/mol)

As a result, aluminum is most reactive, followed by titanium, then magnesium.

This is the reason why aluminum is used in solid rocket motors and various other explosive devices.

Under different conditions, these numbers may change: for instance a reaction with water instead of air may yield different enthalpies. At quick glance in water, titanium is actually least reactive when compared to aluminum and magnesium.

cphajduk··on OpenAI board in discussions with Sam Altman to return as CEO
Having the CEO of Quora on the board also smells of a vested interest to hold the company/non-profit back.
cphajduk··on Intimacy does not scale (2021)
Doesn't have to even be that complicated. Remember when YouTube comments used to be a dumpster fire?

I'm pretty sure YouTube is doing sentiment analysis on all comments and artificially promoting the ones that tend to be positive.

cphajduk··on Real-world ranges for Teslas 50-60% of EPA Range
Yeah agreed. I'm a bit doubtful of the data presented in the article mostly because the company/CEO has a conflict of interest with objective analysis. They earn money from producing 'EV battery and range' reports.

The data in the article could easily be cherry-picked.

cphajduk··on S.F. says incidents by Cruise, Waymo driverless taxis are ‘skyrocketing.’
On the face of it, we don't know.

It's just he said she said.

cphajduk··on We raised a bunch of money
I would partially disagree. I think your statements are true, but only for companies that raise investments on the promise of scaling to greater profitability, but ultimately fail to deliver. If the founders delude themselves or are overly optimistic, the only recourse they have to investors is to gouge the customer.

Raising the 'right' amount should be the goal. Not 'as much as possible'

cphajduk··on San Francisco’s Financial Crisis
If employee wages are a large part of the rising costs, then perhaps the cost of living for living in SF is too high. The cost of living is too high because rent is too high.

Since there is so much political contention to building more housing, there is no chance that housing prices will decrease (nobody wants to see their property lose value).

Now they are complaining about the problem they caused?!?

I don't know if this is ironic, justified or just funny. You can't have your cake and eat it too.

cphajduk··on Want an unfair advantage in your tech career? Consume content for other roles
The thing is... Pushing outside your lane is VERY often discouraged. The manager sees that any time outside of your lane is less time in "your managers" lane, where you help buml his KPIs/goals.
cphajduk··on Why Not Mars
How long?

Consecutive stay in the ISS has been completed for 355 days (almost year) with less than 10 people onboard at that time.

cphajduk··on Why Not Mars
Actually - It doesn't get the numbers right either. If you look at the first reference, "[1]", the author says:

"I’ll justify this figure in detail later on. For now, consider that each SLS launch costs $4.2B, and that developing just the Orion space capsule has cost $20B. The ISS, which is functionally close to a Mars transfer vehicle, has so far cost $250 billion."

With absolutely no regard for the massive cost per kg to orbit improvement being achieved by new space companies (SpaceX, RocketLab, etc.)

The author has cherry-picked his facts to fit his opinion.

cphajduk··on Saying “sup” with `net send`
Oh man. This is so similar to my high school story. The only difference is instead of 'sup', one of my friends typed 'you can't catch me I'm the gingerbread man'.

Although, I don't actually think they really tried or were ever going to try to catch him.

Same thing for me, the feature was disabled shortly thereafter.

cphajduk··on OpenBSD Adds Support for Coordinated Mars Time (MTC)
need to set the SSH timeout to 44 minutes.
cphajduk··on Ask HN: Cheapest/easiest way to host a static site?
And 9 of them are just bots.
cphajduk··on CoScreen: Screen Sharing for Engineers
I've heard the opposite advice.

Don't worry about competitors, worry about making your product the best it can possibly be (which if successful would be better than competitors).

cphajduk··on GitHub, fuck your name change
To me, "master" and "slave" are historic terms used throughout electrical, software, even entertainment industries.

Eliminating words from a vocabulary is very 1984-like. Those words have a deep historical meaning, allowing ourselves to just "remove them" is akin to forgetting and ignoring the dark past of slavery, rather than remembering and acknowledging it (with the hopes it will never happen again).

Saying that it helps change habits (in my opinion) is analogous to saying that preventing kids from playing violent video games will reduce mass shootings (there is evidence it does not). I disagree with your premise that this pushes us to change habits and is only a mechanism to be ashamed of our shared (and dark) history. Lest we forget.

cphajduk··on Moore's Law for Everything
Time to start:

ActuallyOpenAI ^TM

cphajduk··on I guess I have to watch ads everywhere on my $1,500 LG TV now
Looking forward to jailbreaking my TV.
cphajduk··on Girls perform better academically in almost all countries (2015)
I'd like to point out that the workplace values are different from academics values.

The top performers in my college class, struggled to get internships within my internship-mandatory program.

cphajduk··on Beyond Meat signs global supply deals with McDonald’s, KFC and Pizza Hut
I did read it indeed, did you?

> "Yeast cannot produce B12, which is naturally produced only by some bacteria.[8] Some brands of nutritional yeast, though not all, are fortified with vitamin B12. When it is fortified, the vitamin B12 (commonly cyanocobalamin) is produced separately and then added to the yeast."

Furthermore, fortified all purpose flour is not the same as fortified nutritional yeast. In fact, what you are referring to is likely _enriched_ all purpose flour. This has vitamin B1, B2, B3, B9 and iron added to it. There is no addition of vitamin B12.

https://en.wikipedia.org/wiki/Enriched_flour

cphajduk··on Beyond Meat signs global supply deals with McDonald’s, KFC and Pizza Hut
Interesting. Turns out I just misunderstood the source of B12. Seems it comes from certain bacteria and archaea.
cphajduk··on Beyond Meat signs global supply deals with McDonald’s, KFC and Pizza Hut
Yes sorry. You are right I wasn't very clear and also I didn't realize that B12 actually comes from bacteria and archaea.

The organisms that provide us vitamin B12 tend to host said bacteria and archaea within their GI.

Alternatively supplements are provided (as I mentioned). Nutritional yeast, dairy, and vitamin pills are some of the ways in which vegetarians survive. Apparently certain beans are high in B12 as well!

cphajduk··on Beyond Meat signs global supply deals with McDonald’s, KFC and Pizza Hut
Because nutritional yeast is fortified. Hence a supplement.

https://en.wikipedia.org/wiki/Nutritional_yeast#Nutrition

cphajduk··on Beyond Meat signs global supply deals with McDonald’s, KFC and Pizza Hut
I'm not sure how the comparison is made, however Vitamin B12 can only be found in meat and eggs.

If you do not have supplements or eat this type of vitamin containing protein, you risk paralysis and death with a 2+ year absence of the vitamin.

I wouldn't be surprised if there are other missing nutrients as well.

cphajduk··on Architecture of the Playstation 2
This reminds me of my homebrew days making custom Guitar Hero 2 tracks. There was a great modding community (scorehero.com) around. This was before DLC was a thing, so if I wanted more content, I had to make it myself.
cphajduk··on Perseverance rover’s descent and touchdown on Mars [video]
The insight mission, which landed in 2018 has failed to stick a thermometer in the ground over the last 2 years.

A human with a rock/hammer could have accomplished the same thing in an hour, conservatively a day at most.

cphajduk··on Perseverance Rover lands on Mars [video]
Depends what type of physicist you ask.

According to the energy-time uncertainty principle we don't even know when exactly the RF waves that transmitted information hit the receiver on Earth either.

cphajduk··on Elon Musk wants clean power. But Tesla's carrying Bitcoin's dirty baggage
Apparently they already do this or have plans to do this with solar power:

https://twitter.com/elonmusk/status/1258308230725292032

cphajduk··on Elon Musk wants clean power. But Tesla's carrying Bitcoin's dirty baggage
Starship runs on Oxygen and Methane, both are renewable, both can easily be extracted from the air. Carbon neutral.
cphajduk··on Tesla skips 401(k) match for third straight year
One of my friends who works there is getting ready to retire on the (non-401k) stock options he received (within the next year or two). He's only been out of college for 5 years.
cphajduk··on IBM has cut its blockchain team down to almost nothing – sources
Not an "implementation", but for me cryptocurrencies seem like a nice way for replacing the slow international wire transfers that you get from the average bank.

I honestly haven't used crypto this way much, but it seems like it would be a decent way to transact across borders.

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