top Tiny Fanless Mini-PC Runs Linux Or Windows On Quad-core AMD SoC
These low power PC's are opening up new opportunities for UPS's, namely that they all run off low voltage DC (nominally 12V) and open up the possability of a 12V UPS. It saves on the inverter required in the UPS, and increases the overall efficiency.
For a device like this with a variable input voltage you can run it directly from a 12V SLA battery, and then keep the battery topped up with a decent mains charger rated to higher power than the PC. You can generally do the same thing with access points and 12V network switches, and any 5V devices can be run from a $5 step down DC-DC converter.
The only problem I've had with this method is 3.5inch USB Hard Drives, as they usually require a well regulated 12V supply. For those I bought a fancier buck-boost DC-DC converter, they were a little pricier and harder for find than, but still quite reasonable.
In the end you may have 30W worth of devices hanging from the SLA batteries, then just buy a multistage charger rated to the next higher power - eg 30W = approx 2.5A @ 12V, so get a 3 or 4amp charger. You can expand to as many parallel as you like, all it does is slow down the recharge time.
top How Close Are We To Engineering the Climate?
I've seen studies on that before.
One of the best ways to seed the oceans is with the addition of iron based minerals. Plants in the food chain need this to grow, but it's very scarce in the ocean. Historically there was a natural seeding process as iron laden dust was blown off the coastlines, but human development has reduced that source.
top HOA Orders TARDIS Removed From In Front of Parrish Home
In Australia we get a Strata Title deed, with common shared assets managed by a strata management company.
For simple blocks subdivided into a few houses, the homeowners can form their own strata company with little to no costs. For apartments buildings they generally employ a third part to manage it, and residents will then pay monthly strata management fees.
top Extra Leap Second To Be Added To Clocks On June 30
I used to build & configure production reporting systems for industry, and the increase in complexity on the math was freaking painful when you had to take in to account daylight savings. Instead of assuming 24 hours in a day, you would always have to calculate "day end minus day start".
These methods would handle leap seconds just as well, but the cost to performance is massive for such a rare event.
top An Automated Cat Litter Box With DRM
Comprehension fail. The machine washes the granules itself, and in the process consumes sanitiser in the DRM laden cartridge.
top 26 Foot Long Boat 3D Printed In 100,000 Different Pieces
Maybe he used PLA, a common 3D printing material. This is made from corn or dextrose.
top Top Five Theaters Won't Show "The Interview" Sony Cancels Release
It was a terrible situation but to put things in perspective, this kind of incident is incredibly rare in Australia and only 2 poeple died. If you had concealed carry, there would be orders of magnitude more accidental deaths. Doesnt seem worth it and the gun controls we have here generally do a good job.
about a month and a half ago
top US Navy Authorizes Use of Laser In Combat
Not true. At those powers, a reflection of any surface can be powerful enough to blind. There will be a lot of collateral damage.
Just remember, lasers in the milliwatt range can do permanent damage and this thing is 30kW. It would only require 0.001% of the energy to be reflected - you can get that much off a black surface, let alone something shiny.
top Using Discarded Laptop Batteries To Power Lights
IF you look athe picture in the article, it appears the cells have been removed from the battery pack casing, and it says they have been "refurbished". I'm guessing that the cells were checked and failed cells have been replaced.
top IoT Is the Third Big Technology 'Wave' In the Last 50 Years, Says Harvard
YEah, I'd prefer an IoT gateway approach too. Use low power radios for comms up to 100m or so, and then a hardened gateway to get you on the LAN or internet.
top Windows 10 To Feature Native Support For MKV and FLAC
Great operating system too, that Windows Media Player.
top Ask Slashdot: Best Biometric Authentication System?
If you're just trying to *identify* a user then a simple RFID, barcode scanner or QR reader would be fine. I assume the staff have ID cards so just incorporate it with that.
For any steps that specifically require security authentication then you use a password as well.
top Germans Can Get Free Heating From the Cloud
Use butane instead of water, which boils at a temperature that is compatible with CPUs. The pressures involved are quite reasonable too eg (30psi).
The butane vapor then flows though a turbine to create power, through a heater exchanger to chill back down and recondense, and then is pumped back to the CPU.
If you have steam your system qwould have
top Dwarf Galaxies Dim Hopes of Dark Matter
Plenty of scientists have tried to use simpler explanations but there is evidence that rules them out. The best example is the bullet cluster - two galaxies collided and the various components of the cluster - stars, gas and dark matter - all behaved differntly during the collision. The gravitational lensing effects cannot be explained by theories that dont include dark matter.
top Anonabox Accused of Lying About Its Product Being Open-Source On Kickstarter
The issue doesnt seem to be the code.
People are claiming that the hardware is just a re-flashed existing micro router, eg here -
Anonabox claim they custom designed the hardware, other are claiming it doesnt seem so, mostly it seems like it a moot point if it's cheap and offers the functionality specified.
top Battery Breakthrough: Researchers Claim 70% Charge In 2 Minutes, 20-Year Life
The Tesla battery pack is made up of small individual cells. Multiple cells in parallel provide higher current and total amp-hours, and long strings of these parallel cells are used to achieve the high voltages used to drive the motors
Now, whilst the main battery discharge terminals may treat the battery as a single unit, smaller monitoring and charging cables can actually be connected to individual clusters of cells. A sensible way of doing this is to connect to across each parallel set of cells. The differntial voltage across each parallel set can then be monitored, and during charging you can use an isolated DC-DC converter to put more power into some sets than others to keep their voltages balanced.
Remote control hobby batteries are often wired this way, for example a 4S1P (4 series 1 parallel) pack will have two main battery terminals, and 5 balancing terminals. A car battery may have the same concept but be configured as 100S10P.
top Independent Researchers Test Rossi's Alleged Cold Fusion Device For 32 Days
Pretty sure lots of poeple are claiming he is violating the laws of physics.
There are very large electrostatic forces that prevent nuclei getting close enough to obtain fusion. To date the only way we've been able to overcome those forces is by using very high velocity (i.e temperature) to smash the atoms together. The proposed "low energy" fusion claims to overcome these electrostatic forces but gives no explanation as to how.
top Dremel Releases 3D Printer
We are no-where near the point where fused filament 3D Printing is a plug and play operation. In the last 12 months I've had to spend a lot of time and effort to get reasonable prints, and have had to regularly consider things like:
Printer idiosyncracies (which a professional printer should avoid):
- Wear & tear on pulleys and bushings changing belt performance - Correct hot end temperatures, scorching and smoking of filament leading to clogged nozzles - Bed flatness - Enclosure temperature control, adhesion to the bed and control of warping
Then, even if your printer is working well there are a huge number of factors to consider when drawing and slicing your shape:
- Orientation of the shape with respect to grain in the filament to give good styrength - Orientation of the shape to avoid bridges and overhangs - Inside fill percentage and fill style to optimise between strength and potential warping. - Adjustment for tolerance and oozing around and intermeshing parts
That's not a complete list, but it's what I'm down to now on a regular basis now that I've tweaked all of the other settings and am getting some consistency.
top How Does Tesla Build a Supercharger Charging Site?
If everyone starts driving EVs, they wont all need to charge at a charging station. Most people will be charging at home overnight, it's only the long distance commuters (maybe 10%) that will need to charge on the go.
Seems like a workable solution.
top Smartphone Kill Switch, Consumer Boon Or Way For Government To Brick Your Phone?
I want a kill switch, in fact I have one on my phone right now in the form of an IMEI blocking scheme by my telco. If someone nicks my new phone it will be worthless within a day.
So far the schemes seem to be working fine and has been adopted across most of Europe, Japan, Korea, Australia and New Zealand. It's not actively enforced in many parts of asia and as such has become a hotspot for stolen phone sales.
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