Ask Slashdot: Where Can I Find Good Replacement Batteries?
Sometimes the variations in reviews is due to variations in the product. Many years ago I worked in a brick and mortar store and resold electronics. I'd buy a small number of units from a supplier and test them. If they were good, I'd buy a bunch for resale. Assuming the customers didn't bring them back, I would buy more of the same, from the same vendor. Customers who were happy with units from the first few batches, were not at all happy with units from later batches.
I dissected customer returns. Again and again, the products in later shipments looked identical on the outside, but were "cost reduced" on the inside. For example, I would see empty places on the circuit boards where the filter capacitors were supposed to go. In one batch of one product, many of the units were dead on arrival, on the ones that worked when I unpacked them, the solder joints only lasted a few weeks. Once opened, I could see that the boards were either soldered at the wrong temperature, it was the wrong type of solder, or badly made solder. Every connection was visibly a cold solder joint. Either the factory had no quality control, or they ignored the quality control.
Other products looked identical inside and out, but based on the failure rate, the factory must have gotten a bad batch of one the components.
Even longer ago, I worked on a product that logged data to a Compact Flash memory card. It was an embedded product that needed to work across a wide temperature range, including in the winter in Minnesota. The big names like SanDisk would randomly swap component suppliers. Our largest customer saw less than a 2% failure rate, but that was way too much. We found a specialty supplier that charged 5 times as much, but they had a rigorous quality control process. They paid attention to the specifications. They tracked where parts came from, and promised that we would be able to test sample units if they needed to switch suppliers. Alas, the 2% failure rate from the earlier parts had already doomed that product line.
The Flight of Gifted Engineers From NASA
The talent behind xkcd is a former NASA engineer.
3D-Printed Material Can Carry 160,000 Times Its Own Weight
The Fine article compares this type of lattice structure to the structure of the Eiffel Tower. They didn't claim anything more than being able to do it at a very fine scale, and to do it sufficiently precisely to get something that can support 160,000 times its one weight. They are just claiming refinements on centuries of engineering advances.
The strength of well engineered 3D printed structures is still impressive. Even some printers that hobbyists can afford can beat out solid materials. It's only getting better.
Intel Rolling Out 800Gbps Cables This Year
These will be used in data centers where it is common to have redundant systems connected with redundant cables, in order to maintain really high uptimes. Say a hypothetical system has a cluster which consists of 16 compute nodes and 2 storage nodes, Each of CPUserver01 through CPUserver16 will have two of these cables going to storageServerA, and two going to StorageServerB. For a total of 64 of these cables, for that one little compute cluster. Which would leave it an island, so of course there will be more network interfaces.
For this technology to get any market penetration, it will need to be cost effective at these bandwidths, and fit in the racks. Historically, Dense Wavelength Division Multiplexing, DWDM has been great at getting a lot of bandwidth on to a very long single strand (comparatively) inexpensive fiber, which allows in fiber signal amplification, and is the winner at going the distance, but not so good at being cost effective, or space efficient. These things, with the associated drivers should take up far less space inside the servers, and cost less, but they only will get 800Gbits in each direction, only go 300 meters, and use much more expensive (per kilometer of cable) 64 strand fiber.
Hard Silicon Wafers Yield Flexible Electronics
Rigid silicon requires rigid interconnects. Flexible ICs allow flexible packaging, or different packaging. Instead of building from the printed circuit board up, build from the heatsink up. Use a precision pick and place system to glue the thin, wimpy, inexpensive silicon to the strong massive heatsink. Then mask on the solder balls. Then apply a thin, wimpy, inexpensive circuit "board". Attach all the old style surface mount components to the other side of the circuit "board". "Board" is in quotes because it would get all of its mechanical strength from heatsink. It might be so thin, it is no longer board like.
The big win here, is that one wafer is good for at least 5 sets of circuits. The lose is the grid of holes etched through the silicon as part of the pealing process. Assuming the grid of holes doesn't use up a significant portion of the surface area, the factory is getting close to 5 times as many devices out of each ingot of silicon.
Atlanta Gambled With Winter Storm and Lost
Georgia Gov. Nathan Deal Calls Winter Storm That Snarled Atlanta 'Unexpected.' Really?
This wouldn't be so embarrassing if the weather service would just delete all that old incriminating information.
Revolutionary Scuba Mask Creates Breathable Oxygen Underwater On Its Own
You can see the student's portfolio on his website: cargocollective.com/jeabyundesign/TRITON . He probably got a good grade. The case looks nice, if not plausible. The design for the guts of the device is lacking. He got the biology wrong, divers don't want pure oxygen. They need a mixture of gasses. The machine would have to process a whole lot of water to get enough oxygen to support a human. This means a whole lot of water would have to continuously flow through the device. Moving that much water takes a lot of energy.
Website Checkout Glitches: Two Very Different Corporate Responses
A few trading firms have learned to have a second system that monitors transactions to keep tabs on profit and loss. If the things swing out of the expected range, it is time to have a human look at the situation. If things get really out of hand, it is time to rate limit transactions, or halt them out right. Sudden extreme profits usually indicates a data entry error on your system, not that the rest of the market has gotten really stupid.
Most inventory systems have a way to track cost of goods, age of inventory, and expected profit margin. Eventually retailers will start filling in those details, and tracking them, so they can notice when something goes expensively wrong.
Google Nexus Gets Wireless Charger
It works even if my Nexus 5 is more than 5 mm above the charging pad. That is many orders of magnitude less than the range for most wireless communication technologies.
The useful features are
- no connector to wear out,
- alignment is simple.
- The USB/thinport connector is available for other uses. (More of a theoretical benefit, as I don't use the USB port for anything, but I could if I wanted to. I've got the cable, I could even plug in an SD card reader.)
Not All USB Power Is Created Equal
The error was an extra "m". The poster meant 0.14 Ohms per meter. I've seen higher resistance USB cable than that in the real world. Think of how much copper they saved by using such thin wires...
How Your Coffee Table Could Pass Your Coffee
I was going to use the subject, Sort My Legos, but the prototype resolution is too low. With more actuators, you could dump Lego bricks on the table and have it sort them for you. Or for the more practical minded, sort wrenches, nuts and bolts.
AMD Intentionally Added Artificial Limitations To Their HDMI Adapters
I have a monitor hooked up to my ComCast cable box in the exercise room. After I exercised for a while, I would get the stupid HDCP warning and/or the video would just cut out. I switched cables, I switched HDMI - DVI adapters, I switched monitors. It seemed like every time I started exercising, the video would stop.
It got worse recently, making it easy to diagnose. It got to the point where the video went away within a second of starting the treadmill. It is an EMI issue. Either the treadmill is emitting too much, or the ComCast box's suicide circuit is too sensitive.
I am so pleased that my ComCast has a suicide circuit to protect me from evildoers who modify treadmills to steal valuable copy righted material.
Intel's Haswell Chips Pushing Windows RT Into Oblivion
They claim 4.5 watts for the low power usage scenario. ARM will be with us for a long time. The ARM folks are climbing the feature/performance curve too. Don't worry about AMD, they are bringing out ARM chips too. Including the ARMv8, aka. ARM64.
AMD describes more fruits of ARM embedded partnership
Bell Labs Break Record With 31Tbps Via a Single 7200km Optical Fibre
The station wagon can outrun a backhoe.
Cray X-MP Simulator Resurrects Piece of Computer History
You need a 3 phase load. That is going to take some careful bolt placement to get the 3 phases matched.
Remind me never to visit your neighborhood.
Cray X-MP Simulator Resurrects Piece of Computer History
For the complete simulation, you need to use a generator load tester to burn the 100 or so kilowatts that the machine used.
Microsoft Prepares Rethink On Windows 8
Microsoft has a habit of padding their sales results. How many of those 100 million licenses are currently in use? Does it include bulk purchases by OEMs? Does a Windows 8 license get subtracted when a user upgrades to Windows 7 or Linux?
Popular Android Anti-Virus Software Fooled By Trivial Techniques
Virus 'signatures" are an ideal technology for dealing with common threats from the late 1990s.
Xkcd's Long-running "Time" Comic: Work of Art Or Nerd Sniping?
The characters built some stuff on the beach, and now they are wandering around trying to figure out how their world works Their world does not work like our world.
The form of story is unusual, in that one must use additional technology to follow it. Which the reading community developed very quickly. I use xkcd.aubronwood.com/.
The Smart Grid Has Arrived
Stealing power takes a certain level of knowledge and attention to detail. Quite a few power thieves manage to send themselves to the emergency room or morgue each year. This is far more common in regions where the theft rate is so high that the power companies install the brains of the meters on the pole transformers. They just put a remote display on the residence.
hamjudo hasn't submitted any stories.
I took down the wireless link
The roofers are coming tomorrow to rip off the old roof and put in a new one.
So I pulled the Pentium 90 with the 802.11 antenna out of the attic tonight. I bet it could handle some wind and a little rain, but there will probably be amazing amounts of dust.
Dave's internet connection will be down until Friday.