thephilsproject

The use and abuse of CT scanners

https://media.ccc.de/v/emf2018-65-the-use-and-abuse-of-ct-sc...

Truly fascinating talk about the capability of CT scanners, not in a medical environment. I don't want to say much more as I don't want to give any spoilers.

> Inactive accounts may be renamed or removed by GitHub staff at their discretion.

1. Github rename Void Linux to Void2 Linux as per above policy.

2. Register Void Linux to existing team.

3. Fork Void2 Linux as Void Linux.

Problem solved.

No Leaf has active cooling, including the latest 40kWh Gen4.

Take a look at this talk from CCC.

https://media.ccc.de/v/32c3-7331-the_exhaust_emissions_scand...

Some product descriptions continue to state that maps on the devices will update multiple times a year "for the lifetime of your device".

On its website, TomTom explains that "lifetime" means the "useful life" of a device: "ie: the period of time TomTom supports your device with updates, services, content or accessories. A device will have reached the end of its life when none of these are available any more."

Updates will be available for the lifetime, which is defined as until we stop providing updates.

(Unsure how to quote)

A lovely new apartment complex in the centre of Cheltenham has 10-15 shop fronts available, every single one is empty. Quite astonishing as the apartments seem very popular.

It's more to reduce degradation - lithium batteries don't like being at <20% or >80% state of charge. If you never let them get there, they will last a lot longer.

Really like the look of this. Need to know whether it'll get software support. Also nervous about backing it, anybody know any history of the guys developing it?

From my understanding, the LEAF has a primitive battery management system compared to other EVs, including passive air cooling of the battery. Lithium batteries are fussy about temperature (they have similar temperature preferences to humans) and outside of this the degradation can be faster. Other EVs have liquid heating and active cooling of the battery.

This doesn't make sense. By that logic, a lithium battery the size of a house wouldn't be able to power an LED.

If you have two lithium batteries which are identical with the exception that one is double the capacity, the larger battery will be able to provide double the current at the same voltage and thus double the power. Lithium batteries are rated for current draw as a multiple of their capacity.

Yes, changing chemistries does change the energy/power density ratio. However I was referring to within a single chemistry. Hence why the higher capacity Teslas have higher performance too.

An ICE doesn't get faster if you put a bigger fuel tank in.

With an electric drivetrain, it's easy to go for high power. As the battery capacity increases, so does the maximum available current. This means that maximum power scales with maximum range from the battery perspective. Then (and I am simplifying this), higher current motor controller, a bigger motor (they are not a big component anyway) and slightly chunkier drivetrain to handle the torque. You don't have the same limitations of a high powered ICE with regards to cooling and packaging.

I can't imagine that the difference between a 200kW and an 800kW drivetrain is more than ~5% of the cost of the car.

I first saw this on the Audi A1 e-tron concept; it was a 250cc wankel for the range extender. I thought that was the future when I saw it, and here I am now with a Vauxhall Ampera (Chevy Volt)!

I had this same problem almost exactly a year ago. I now have a Surface Pro 3.

I wanted a decent CPU, high res screen, , good build, long battery life and small chassis. Then I chose whichever was cheapest which met those criteria.

I've not been disappointed with my decision!