Lifeboat Foundation

When urban development takes place, a traffic impact assessment is often needed before a project is approved: What will happen to auto traffic if a new apartment building or business complex is constructed, or if a road is widened? On the other hand, new developments affect foot traffic as well — and yet few places study the effects of urban change on pedestrians.

A group of MIT researchers wants to alter that, by developing a model of pedestrian activity that planners and city officials can use in much the same way officials evaluate vehicle traffic. A study they have conducted of Melbourne, Australia, shows that the model works well when tested against some of the most comprehensive pedestrian data available in the world.

“Our model can predict changes in pedestrian volume resulting from changes in the built environment and the spatial distribution of population, jobs, and business establishments,” says Andres Sevtsuk, an associate professor in MIT’s Department of Urban Studies and Planning (DUSP) and lead author of a newly published paper detailing the results. “This provides a framework to understand how new developments can affect pedestrian flows on city streets.”

A virtual army of 4,000 doglike robots was used to train an algorithm capable of enhancing the legwork of real-world robots, according to an initial report from Wired. And new tricks learned in the simulation could soon see execution in a neighborhood near you.

While undergoing training, the robots mastered the up-and downstairs walk without too much struggle. But slopes threw them for a curve. Few could grasp the essentials of sliding down a slope. But, once the final algorithm was moved to a real-world version of ANYmal, the four-legged doglike robot with sensors equipped in its head and a detachable robot arm successfully navigated blocks and stairs, but had issues working at higher speeds.

Continue reading “New Virtual Obstacle Courses Are Teaching Real Robots How to Walk” »

The semiconductor shortage has curtailed the choices available to designers and caused some inventive solutions to be found, but the one used by [djzc] is probably the most inventive we’ve yet seen. The footprint trap, when a board is designed for one footprint but shortages mean the part is only available in another, has caught out many an engineer this year. In this case an FTDI chip had been designed with a PCB footprint for a QFN package when the only chip to be found was a QFP from a breakout board.

For those unfamiliar with semiconductor packaging, a QFN and QFP share a very similar epoxy package, but the QFN has its pins on the underside flush with the epoxy and the QFP has them splayed out sideways. A QFP is relatively straightforward to hand-solder so it’s likely we’ll have seen more of them than QFNs on these pages.

There is no chance for a QFP to be soldered directly to a QFN footprint, so what’s to be done? The solution is an extremely inventive one, a two-PCB sandwich bridging the two. A lower PCB is made of thick material and mirrors the QFN footprint above the level of the surrounding components, while the upper one has the QFN on its lower side and a QFP on its upper. When they are joined together they form an inverted top-hat structure with a QFN footprint below and a QFP footprint on top. Difficult to solder in place, but the result is a QFP footprint to which the chip can be attached. We like it, it’s much more elegant than elite dead-bug soldering!

A Northwestern University research team has developed a versatile composite fabric that can deactivate both biological threats, such as the novel coronavirus that causes COVID-19, and chemical threats, such as those used in chemical warfare. A material that is effective against both classes of threats is rare.

The material also is reusable. It can be restored to its original state after the fabric has been exposed to threats by a simple bleach treatment. The promising fabric could be used in face masks and other protective clothing.

“Having a bifunctional material that has the ability to deactivate both chemical and biological toxic agents is crucial since the complexity to integrate multiple materials to do the job is high,” said Northwestern’s Omar Farha, an expert in metal-organic frameworks, or MOFs, which is the basis for the technology.

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Perhaps the question isn’t ‘can machines be human,’ but ‘are humans machines?’

“The use of organophosphate esters in everything from TVs to car seats has proliferated under the false assumption that they’re safe,” said Heather Patisaul, lead author and neuroendocrinologist at North Carolina State University. “Unfortunately, these chemicals appear to be just as harmful as the chemicals they’re intended to replace but act by a different mechanism.”

Summary: Exposure to even low levels of common chemicals called organophosphate esters can harm IQ, memory, learning, and brain development overall in young children.

Source: Green Science Policy Institute

Continue reading “Common Chemicals in Electronics and Baby Products Harm Brain Development” »

Acclaimed Harvard professor and entrepreneur Dr. David Sinclair believes that we will see human life expectancy increase to at least 100 years within this century. A world in which humans live significantly longer will have a major impact on economies, policies, healthcare, education, ethics, and more. Sinclair joined Bridgewater Portfolio Strategist Atul Lele to discuss the science and societal, political, systemic and ethical implications of humans living significantly longer lives.

Recorded: Aug 30 2021

Continue reading “Preparing For a World With Longer Life Expectancy” »

Elon is the king.

Elon Musk is pulling away from the rest of the world when it comes to personal wealth.

Back in June, the investor advocacy nonprofit As You Sow had filed a shareholder resolution with the Securities and Exchange Commission requesting that Microsoft examine the “environmental and social benefits of making its devices more easily repairable through measures such as the public provision of tools, parts, and repair instructions.” Prior to that resolution, Microsoft—like many tech companies—had essentially rigged the game so that its devices could only be fixed at authorized shops, effectively creating a monopoly on repairs that stifled consumer freedom and made everyone’s lives harder.

But on Thursday, Grist reported that Microsoft has now made a series of critical concessions as a result of that resolution, including a pledge to hire an independent consultant to study the ways increasing access to the parts and information could cut down on electronic waste and lessen damaging environmental impacts, and a commitment to acting on the findings of that study by the end of 2022.

“This is an encouraging step by Microsoft to respond to the upswell of federal and state activity in the right to repair movement,” Kelly McBee, waste program coordinator at As You Sow, said in a press release. “Excitingly, this agreement will begin to allow consumers to repair their Microsoft devices outside the limited network of authorized repair shops.”