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Learn to think like an engineer with the help of these courses
Math can become intuitive with a little practice.
07 July, 2020
- Engineering is the foundation of society, from physical infrastructure to every device in your possession.
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<script async="true" src="https://widgets.stackcommerce.com/js-deal-feed/0.1/widget.js" type="text/javascript"></script><p>Have you ever felt like you're just not good at math? Many people feel they don't have the intuitive sense needed to grapple with mathematical concepts. Yet no one is born a math genius. As with everything, it takes time and patience.<br></p><p><a href="https://shop.bigthink.com/sales/the-mathmatics-for-engineers-prep-bundle?utm_source=bigthink.com&utm_medium=referral&utm_campaign=the-mathmatics-for-engineers-prep-bundle&utm_term=scsf-402383&utm_content=a0x1P000004sTZtQAM&scsonar=1" target="_blank"><strong>The Mathematics for Engineers Prep Bundle</strong></a> teaches you how to think like an engineer through a range of math concepts, including applied calculus, machine learning, data science, and Algebra 2. This nine-course bundle will help you acquire that intuition you seek.</p><p>The first four courses are dedicated to applied calculus for engineers. Through 219 lessons you'll learn the principles of beginner to advanced calculus. Practical knowledge will be applied to 3D coordinate systems. You'll also learn how to perform mass calculations to varying densities and take a deep dive into aerospace and robotics.</p><p>With 165 lessons devoted to data science and machine learning, you'll be schooled in linear equations, single matrix, vectors, determinants, and more. The complete guide to Algebra 2 is an education in fractions, exponents, inequalities, and surds. A course on linear algebra will help you brush up on basic matrix operations and computer determinants.</p><p>Aerospace and robotics engineer Mark Misin leads you through these 560 lessons. Misin has taught thousands of people the fundamentals of math over the course of his career. You could be the next.</p><p><a href="https://shop.bigthink.com/sales/the-mathmatics-for-engineers-prep-bundle?utm_source=bigthink.com&utm_medium=referral&utm_campaign=the-mathmatics-for-engineers-prep-bundle&utm_term=scsf-402383&utm_content=a0x1P000004sTZtQAM&scsonar=1" rel="noopener" target="_blank"><strong>The Mathematics for Engineers Prep Bundle</strong></a> is on sale now for just $28.99 – 97% off the original price.</p><p><em>Price subject to change.</em></p><h3><strong>More from the Big Think Shop</strong></h3><ul class="ee-ul">
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Study: Reflecting sunlight to cool the planet will cause other global changes
Solar geoengineering ideas could weaken storms in both hemispheres, scientists find.
22 June, 2020
JACK GUEZ/AFP via Getty Images
How can the world combat the continued rise in global temperatures? How about shading the Earth from a portion of the sun's heat by injecting the stratosphere with reflective aerosols?
<p> After all, volcanoes do essentially the same thing, albeit in short, dramatic bursts: When a Vesuvius erupts, it blasts fine ash into the atmosphere, where the particles can linger as a kind of cloud cover, reflecting solar radiation back into space and temporarily cooling the planet.</p><p>Some researchers are exploring proposals to engineer similar effects, for example by launching reflective aerosols into the stratosphere — via planes, balloons, and even blimps — in order to block the sun's heat and counteract global warming. But such solar geoengineering schemes, as they are known, could have other long-lasting effects on the climate.</p><p>Now scientists at MIT have found that solar geoengineering would significantly change extratropical storm tracks — the zones in the middle and high latitudes where storms form year-round and are steered by the jet stream across the oceans and land. Extratropical storm tracks give rise to extratropical cyclones, and not their tropical cousins, hurricanes. The strength of extratropical storm tracks determines the severity and frequency of storms such as nor'easters in the United States.</p>
<p>The team considered an idealized scenario in which solar radiation was reflected enough to offset the warming that would occur if carbon dioxide were to quadruple in concentration. In a number of global climate models under this scenario, the strength of storm tracks in both the northern and southern hemispheres weakened significantly in response.</p><p>Weakened storm tracks would mean less powerful winter storms, but the team cautions that weaker storm tracks also lead to stagnant conditions, particularly in summer, and less wind to clear away air pollution. Changes in winds could also affect the circulation of ocean waters and, in turn, the stability of ice sheets.</p><p>"About half the world's population lives in the extratropical regions where storm tracks dominate weather," says Charles Gertler, a graduate student in MIT's Department of Earth, Atmospheric and Planetary Sciences (EAPS). "Our results show that solar geoengineering will not simply reverse climate change. Instead, it has the potential itself to induce novel changes in climate."</p><p>Gertler and his colleagues have published their results this week in the journal <em>Geophysical Research Letters</em>. Co-authors include EAPS Professor Paul O'Gorman, along with Ben Kravitz of Indiana University, John Moore of Beijing Normal University, Steven Phipps of the University of Tasmania, and Shingo Watanabe of the Japan Agency for Marine-Earth Science and Technology</p>
<h3>A not-so-sunny picture</h3><p>Scientists have previously modeled what Earth's climate might look like if solar geoengineering scenarios were to play out on a global scale, with mixed results. On the one hand, spraying aerosols into the stratosphere would reduce incoming solar heat and, to a degree, counteract the warming caused by carbon dioxide emissions. On the other hand, such cooling of the planet would not prevent other greenhouse gas-induced effects such as regional reductions in rainfall and ocean acidification.</p><p>There have also been signs that intentionally reducing solar radiation would shrink the temperature difference between the Earth's equator and poles or, in climate parlance, weaken the planet's meridional temperature gradient, cooling the equator while the poles continue to warm. This last consequence was especially intriguing to Gertler and O'Gorman.</p><p>"Storm tracks feed off of meridional temperature gradients, and storm tracks are interesting because they help us to understand weather extremes," Gertler says. "So we were interested in how geoengineering affects storm tracks."</p><p>The team looked at how extratropical storm tracks might change under a scenario of solar geoengineering known to climate scientists as experiment G1 of the Geoengineering Model Intercomparison Project (GeoMIP), a project that provides various geoengineering scenarios for scientists to run on climate models to assess their various climate effects.</p><p>The G1 experiment assumes an idealized scenario in which a solar geoengineering scheme blocks enough solar radiation to counterbalance the warming that would occur if carbon dioxide concentrations were to quadruple.</p><p>The researchers used results from various climate models run forward in time under the conditions of the G1 experiment. They also used results from a more sophisticated geoengineering scenario with doubling of carbon dioxide concentrations and aerosols injected into the stratosphere at more than one latitude. In each model they recorded the day-to-day change in air pressure at sea level pressure at various locations along the storm tracks. These changes reflect the passage of storms and measure a storm track's energy.</p><p>"If we look at the variance in sea level pressure, we have a sense of how often and how strongly cyclones pass over each area," Gertler explains. "We then average the variance across the whole extratropical region, to get an average value of storm track strength for the northern and southern hemispheres."</p>
<h3>An imperfect counterbalance</h3><p>Their results, across climate models, showed that solar geoengineering would weaken storm tracks in both Northern and Southern hemispheres. Depending on the scenario they considered, the storm track in the Northern Hemisphere would be 5 to 17 percent weaker than it is today.</p><p>"A weakened storm track, in both hemispheres, would mean weaker winter storms but also lead to more stagnant weather, which could affect heat waves," Gertler says. "Across all seasons, this could affect ventilation of air pollution. It also may contribute to a weakening of the hydrological cycle, with regional reductions in rainfall. These are not good changes, compared to a baseline climate that we are used to."</p><p>The researchers were curious to see how the same storm tracks would respond to just global warming alone, without the addition of social geoengineering, so they ran the climate models again under several warming-only scenarios. Surprisingly, they found that, in the northern hemisphere, global warming would also weaken storm tracks, by the same magnitude as with the addition of solar geoengineering. This suggests solar geoengineering, and efforts to cool the Earth by reducing incoming heat, would not do much to alter global warming's effects, at least on storm tracks — a puzzling outcome that the researchers are unsure how to explain.</p>
<p>In the Southern Hemisphere, there is a slightly different story. They found that global warming alone would strengthen storm tracks there, whereas the addition of solar geoengineering would prevent this strengthening, and even further, would weaken the storm tracks there.</p><p>"In the Southern Hemisphere, winds drive ocean circulation, which in turn could affect uptake of carbon dioxide, and the stability of the Antarctic ice sheet," O'Gorman adds. "So how storm tracks change over the Southern Hemisphere is quite important."</p><p>The team also observed that the weakening of storm tracks was strongly correlated with changes in temperature and humidity. Specifically, the climate models showed that in response to reduced incoming solar radiation, the equator cooled significantly as the poles continued to warm. This reduced temperature gradient appears to be sufficient to explain the weakening storm tracks — a result that the group is the first to demonstrate.</p><p>"This work highlights that solar geoengineering is not reversing climate change, but is substituting one unprecedented climate state for another," Gertler says. "Reflecting sunlight isn't a perfect counterbalance to the greenhouse effect."</p><p>Adds O'Gorman: "There are multiple reasons to avoid doing this, and instead to favor reducing emissions of CO2 and other greenhouse gases."</p><p>This research was funded, in part, by the National Science Foundation, NASA, and the Industry and Foundation sponsors of the MIT Joint Program on the Science and Policy of Global Change.</p><p>Reprinted with permission of <a href="http://news.mit.edu/" target="_blank">MIT News</a>. Read the <a href="http://news.mit.edu/2020/reflecting-sunlight-cool-planet-storm-0602" target="_blank">original article</a>.</p>
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From zero to hero in 18 years: How SpaceX became a nation-state
SpaceX's momentous Crew Dragon launch is a sign of things to come for the space industry, and humanity's future.
30 May, 2020
Photo:Joe Raedle/Getty Images
- SpaceX was founded in 2002 and was an industry joke for many years. Eighteen years later, it is the first private company to launch astronauts to the International Space Station.
- Today, SpaceX's Crew Dragon launched NASA astronauts Bob Behnken and Doug Hurley to the ISS. The journey will take about 19 hours.
- Dylan Taylor, chairman and CEO of Voyager Space Holdings, looks at SpaceX's journey from startup to a commercial space company with the operating power of a nation-state.
<p><br></p>
<p>Today is a historic date for human spaceflight. For the first time in human history, a private company has taken astronauts, not just for a poke above the <a href="https://en.wikipedia.org/wiki/K%C3%A1rm%C3%A1n_line" target="_blank">Karman line</a> (the arbitrary line at 62 miles that divides the stratosphere from space) as <a href="https://www.cnn.com/2019/10/16/tech/virgin-galactic-beth-moses-spacesuit/index.html" target="_blank">Virgin Galactic</a> has done, but much deeper into orbit, some 220 miles to the International Space Station. A feat that requires not only much higher altitude but a precise rendezvous with an object moving at over 17,000 miles per hour. In addition, this launch marks a huge milestone for US Spaceflight, as the US has now rectified the embarrassing fact that it has had no way of transporting its astronauts to space without relying on the Russian Federation. A circumstance that has persisted since the Space Shuttle program was <a href="https://en.wikipedia.org/wiki/Space_Shuttle_retirement" target="_blank">retired in 2011</a>. How did SpaceX, which was founded in 2002, achieve nation-level capability in 18 short years? How did it go from not being entrusted with the lowliest of payloads, to flying NASA astronauts Bob Behnken and Doug Hurley? And do so by delivering launch services at a fraction of the cost of both the US and Russia? </p>
<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMzMyNDExOC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTU5OTEwMzgyMH0.QbG7jKYfMVn0q8vYKd91wY3sL9xAn0FF0hvQ8whcLfM/img.jpg?width=980" id="36f21" class="rm-shortcode" data-rm-shortcode-id="79eb299b23f74c43d4bd16bcf7f4ac1c" data-rm-shortcode-name="rebelmouse-image" alt="NASA astronauts Bob Behnken and Doug Hurley" />
NASA astronauts Bob Behnken and Doug Hurley
Photo: SpaceX
The humblest of beginnings
<p>SpaceX was an inside joke for many in the space industry establishment even years after its founding. Its first three launches famously and spectacularly failed, leading to not only snickers among the industry elite, but stressing SpaceX and its founder, Elon Musk, down to literally their last dollar. <a href="https://www.cnbc.com/2017/09/29/elon-musk-9-years-ago-spacex-nearly-failed-itself-out-of-existence.html" target="_blank">As Musk has related several times</a>, SpaceX's fourth launch was a "make or break." Had it failed, the company would have filed for bankruptcy. Thankfully, that launch was successful and SpaceX has really never looked back. The industry insiders who doubt SpaceX still exist, but their snickers have turned to more nuanced criticism, including that SpaceX unfairly benefits from government contracting. Which is ironic for an industry that has been built on a defense contracting model. The truth is, SpaceX has made space cool again. One only needs to compare its rocket launch telecasts with those of their competitors. One has Hollywood-level production quality and attracts over <a href="https://www.theverge.com/2018/2/6/16981730/spacex-falcon-heavy-launch-youtube-live-stream-record" target="_blank">1 million live viewers per launch</a> and the others seem dated, uninspired and draw 25,000 viewers on their best day. This has led to SpaceX being one of the employers of choice in the space industry, despite its legendary long hours and difficult working environment. Attracting top talent has been one of the reasons SpaceX has been able to achieve its miraculous product success.</p>A big bet
<p>Once SpaceX learned to launch rockets, Musk's product vision became more futuristic. Just like it doesn't make sense to fly a <a href="https://en.wikipedia.org/wiki/Airbus_A380" target="_blank">$400M</a> Airbus 380 from Dubai to Los Angeles only to throw the airplane away after landing, Musk challenged the industry to reuse its rocket boosters. This vision was <a href="https://blog.spexcast.com/spacex-develop-resuable-rockets/" target="_blank">audacious</a> and was faced with massive skepticism in the industry. Despite this, SpaceX stuck its first landing of a <a href="https://www.youtube.com/watch?v=lEr9cPpuAx8" target="_blank">single rocket booster</a> on April 8, 2016. Stuck its first <a href="https://www.youtube.com/watch?v=V3dvELj9kkU" target="_blank">dual rocket booster</a> landing on February 6, 2018 and even stuck a <a href="https://www.youtube.com/watch?v=HVqWEoyiaBA" target="_blank">triple landing</a> on April 12, 2019. It has now landed 49 out of its last 51 attempts. This has literally changed the game in terms of both launch costs, but also cycle time (the amount of time needed between launches). It is a game changer that will be further stretched when the potentially revolutionary heavy rocket <a href="https://www.spacex.com/vehicles/starship/" target="_blank">Starship</a> is rolled out sometime in the next year. In addition to the boosters, SpaceX also recovers other parts from the launch including the fairing, which houses the actual payload of the launch.</p><img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMzMyNDEyMC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYxODYzMDc4MH0.-Rlf6BDLUJnoLrJgzFNEcMaR-7DnsF8jZIjonI7ORSA/img.jpg?width=980" id="01144" class="rm-shortcode" data-rm-shortcode-id="f95cad433004c7fc351369d723ef6e22" data-rm-shortcode-name="rebelmouse-image" />
NASA astronauts Bob Behnken and Doug Hurley inside Crew Dragon.
Photo: SpaceX
Criticism and triumph
<p>Elon Musk has his critics, and certainly he has his lieutenants who do not get enough credit for their impact on SpaceX's achievements, such a SpaceX president Gwynne Shotwell, but, regardless, it is indisputable that SpaceX has achieved a level of capability that is truly shocking in a relativity short period of time. Should SpaceX be celebrated for its persistence, entrepreneurism, innovation and ultimate value creation? Without question. Is SpaceX finished pushing boundaries and achieving what others thought was impossible? Not even close. If Musk stays healthy and avoids a Howard Hughes moment, as many fear, it is hard to doubt his ability to make his dream of landing humans on Mars a reality within his next 18 years (if not sooner).</p><img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMzMyNDEyNC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYwNjAyNzI2N30.pM-3thkrk0n8wRnjoUrhmdEZqDs9Qv3ROSq9FgH34Fo/img.jpg?width=980" id="52ace" class="rm-shortcode" data-rm-shortcode-id="28e5f4356a3b53f31f04aa621d24bf0c" data-rm-shortcode-name="rebelmouse-image" />
The Crew Dragon demonstration of the launch escape system.
Photo: SpaceX
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What can your microwave tell you about your health?
An MIT system uses wireless signals to measure in-home appliance usage to better understand health tendencies.
26 May, 2020
John Moore/Getty Images
For many of us, our microwaves and dishwashers aren't the first thing that come to mind when trying to glean health information, beyond that we should (maybe) lay off the Hot Pockets and empty the dishes in a timely way.
<p>
But we may soon be rethinking that, thanks to new research from MIT's Computer Science and Artificial Intelligence Laboratory (CSAIL). The system, called "Sapple," analyzes in-home appliance usage to better understand our health patterns, using just radio signals and a smart electricity meter.
</p><p>
Taking information from two in-home sensors, the new machine learning model examines use of everyday items like microwaves, stoves, and even hair dryers, and can detect where and when a particular appliance is being used.
</p><p>
For example, for an elderly person living alone, learning appliance usage patterns could help their health-care professionals understand their ability to perform various activities of daily living, with the goal of eventually helping advise on healthy patterns. These can include personal hygiene, dressing, eating, maintaining continence, and mobility.
</p><p>
"This system uses passive sensing data, and does not require people to change the way they live," says MIT PhD student Chen-Yu Hsu, the lead author on a new paper about Sapple. "It has potential to improve things like energy saving and efficiency, give us a better understanding of the daily activities of seniors living alone, and provide insight into the behavioral analytics for smart environments."</p>
<p>
Of the two sensors, the "location sensor" uses radio signals to sense placement, and covers around 40 feet, or enough to cover a typical one-bedroom apartment. A user can walk around their apartment to set up the sensor, which allows it to understand the physical boundaries, and then the sensor can limit itself to that specified area.
</p><iframe width="560" height="315" src="https://www.youtube.com/embed/oXci_S59zEA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe><p>
The team says the system could potentially be useful during the Covid-19 pandemic, where there's an increasing interest in <a href="http://news.mit.edu/2019/movement-tracking-system-marko-behavioral-data-0508" target="_blank">contactless sensing of health</a> and <a href="https://www.csail.mit.edu/news/csail-device-lets-doctors-monitor-covid-19-patients-distance" target="_blank">behaviors</a>. They can imagine using passive sensor data to free up the need for caregivers to visit higher-risk populations and minimize overall in-person contact.
</p><p>
Sapple comes from the team's growing body of research focused on using wireless sensing to better understand our complex human bodies — such as an in-body "GPS" <a href="http://news.mit.edu/2018/gps-inside-your-body-0820" target="_blank">sensor</a> with the goal of tracking tumors or dispensing drugs, a <a href="http://news.mit.edu/2018/artificial-intelligence-senses-people-through-walls-0612" target="_blank">wireless smart-home system</a> for monitoring diseases and helping the elderly "age in place," and another system for <a href="http://news.mit.edu/2017/dina-katabi-csail-team-develop-wireless-system-to-detect-walking-speeds-0501" target="_blank">measuring gait</a> to help monitor and diagnose various ailments.
</p>
<p>Previous work in learning appliance usage has looked at using energy data from a utility meter. But this approach makes it challenging to tease out details, as the energy data is a mix of multiple appliances' patterns all added together.</p><p>Unsupervised approaches — those in which training data aren't labeled — assume patterns of individual appliances are unknown. However, since the utility meter measures the total energy used by the home, it's really hard to learn individual appliances or detect them effectively.</p><p>Sapple stays in the unsupervised realm: It doesn't assume we know the patterns of individual appliances, but instead uses data from a second sensor to help learn appliance usage patterns with self-supervision. For example, the location sensor captures a person's motion as they approach a microwave, put food in it, and turn it on. The model then analyzes the data, and learns when specific appliances are turned on, and what their locations are in a home.</p><p>In addition to health, Sapple could potentially help reduce our heavy imprint on the natural world. By analyzing appliance usage patterns within homes, the system could be used to encourage energy-saving behaviors and improve forecasting and delivery for utility companies.</p>
<p>The team notes that their system's approach solves some of the issues that can be tricky for in-home sensors. For example, using the location data doesn't always imply appliance usage, as people can be next to an appliance without using it. Also, many appliances like refrigerators cycle their power and create "background events," and there could be location data from multiple people in a home, but not all of them are related to appliance usage. Sapple solves these problems by learning when the two sensor streams become related, and uses that to discover when appliances are turned on, and their locations.</p><p>"As indoor location-sensing starts to potentially become as common as Wi-Fi in the future, the hope is that our technology can be effortlessly applied to all places with utility meters," says Hsu. "This could enable new applications for passive health sensing in the homes. Utility companies, for example, could reduce peak demands by providing personalized feedback, optimize energy generation and delivery, and ultimately improve energy efficiency."</p><p>Hsu wrote the paper alongside CSAIL PhD students Abbas Zeitoun and Guang-He Lee, as well as MIT professors Dina Katabi and Tommi Jaakkola. They presented the paper virtually at the International Conference on Learning Representations.</p><p><span></span>Reprinted with permission of <a href="http://news.mit.edu/" target="_blank">MIT News</a>. Read the <a href="http://news.mit.edu/2020/what-can-your-microwave-tell-you-about-your-health-mit-sapple-0518" target="_blank">original article</a>.</p>
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Society needs electrical engineers to function. Here's how you can become one.
Learn to understand the foundations of modern life and even launch a new career.
28 March, 2020
- Electrical engineering is the study, design, and application of systems that utilize electricity and electronics.
- Modern applications include power grids, telecommunications, and circuit boards.
- Computing systems such as supercomputers and tablets rely on electrical engineering.
<p>
Modern society is powered by complex systems that keep everything from sleepy suburbs to major metropolises operational. Electrical engineering is at the heart of how the entire world operates, yet most of us have little idea how it all works.
</p><p>
Whether you're pivoting to a new career or are just curious about the power structures of society, educating yourself on how modernity runs has extraordinary benefits. For anyone who has ever wanted to learn about electrical engineering, <a href="https://shop.bigthink.com/sales/the-ultimate-electrical-engineering-master-class-bundle?utm_source=bigthink.com&utm_medium=referral&utm_campaign=the-ultimate-electrical-engineering-master-class-bundle&utm_term=scsf-378195&utm_content=a0x1P000004NNRj&scsonar=1" target="_blank"><strong>The Introductory Electrical Engineering Master Class Bundle</strong></a> is your go-to guide.
</p><p>
These 381 lessons, taught across 5 separate courses by electrical power engineer and Khadija Academy founder, Ahmed Mahdy, will teach you all about electric DC circuits, electrical substations, Autocads, transformers, and more foundational elements.
</p><p>
The training serves as a perfect entry-point for newcomers and can lay the foundation to a successful electrical engineering career, which can pay <a href="https://www.payscale.com/research/US/Job=Electrical_Engineer/Salary" rel="noopener" target="_blank">up to six figures</a> in the United States.</p><p class="shortcode-media shortcode-media-rebelmouse-image">
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stackSonar('stack-connect-p', '393');
</script>
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