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Category: Civil Engineering

Electroanatomical mapping with non-thrombogenic, stretchable and active multielectrode arrays (MEAs)

Stretchable OECT array on honeycomb grid substrate. A) The stretchable electrophysiological OECT array on a honeycomb grid parylene substrate. B) Cross-section of the stretchable OECT array. C) A 4 x 4 stretchable OECT array when intrinsically stretched. D) Magnified view of 4 x 4 stretchable OECT array when stretched. Credit: Science Advances, doi: 10.1126/sciadv.aau2426 To evaluate in vivo physiological functions, electrophysiological signals must be monitored with high precision and high spatial or temporal resolution. Ultraflexible, multielectrode arrays (MEAs) were recently…

Crash reporting in desktop Python applications

One of the greatest challenges associated with maintaining a complex desktop application like Dropbox is that with hundreds of millions of installs, even the smallest bugs can end up affecting a very large number of users. Bugs inevitably will strike, and while most of them allow the application to recover, some cause the application to terminate. These terminations, or “crashes,” are highly disruptive events: when Dropbox stops, synchronization stops. To ensure uninterrupted sync for our users we automatically detect and…

Scaling Time Series Data Storage — Part II – Netflix TechBlog – Medium

In January 2016 Netflix expanded worldwide, opening service to 130 additional countries and supporting 20 total languages. Later in 2016 the TV experience evolved to include video previews during the browsing experience. More members, more languages, and more video playbacks stretched the times series data storage architecture from part 1 close to its breaking point. In part 2 here, we will explore the limitations of that architecture and describe how we’re re-architecting for this next phase in our evolution. Breaking…

GraphQL Server Design @ Medium – Medium Engineering

A while ago, we told the story of how we are migrating to React.js and a service oriented architecture with the help of GraphQL. Now, we want to tell the story of how the structure of our GraphQL server helped make our migration much smoother. We had three things in mind when we began designing our GraphQL server: It should be easy to alter the shape of the dataWe currently use protocol buffers as a schema for data that comes…

Scaling Machine Learning at Uber with Michelangelo

By Jeremy Hermann & Mike Del Balso In September 2017, we published an article introducing Michelangelo, Uber’s Machine Learning Platform, to the broader technical community. At that point, we had over a year of production experience under our belts with the first version of the platform, and were working with a number of our teams to build, deploy, and operate their machine learning (ML) systems. As our platform matures and Uber’s services grow, we’ve seen an explosion of ML deployments…

Environmentally friendly concrete from industrial waste is as strong as traditional

After several years of intensive work KTU scientists succeeded to develop alkali activated concrete, which compressive strength is 55 MPa (the same as in usual concrete). Credit: KTU Scientists at Kaunas University of Technology (KTU), Lithuania are developing methods for producing concrete without cement, using fly ash, an industrial waste product. The final product is as strong as traditional concrete, is more resilient to damaging effects of acid, and more stable in cases of exposure to extreme heat and cold.…

Research investigates ‘smart’ highway signs to prevent wrong-way driving crashes

FSU’s research team evaluated high-tech countermeasures for wrong-way driving. Credit: Florida Department of Transportation Innovative traffic safety research from Florida State University, incorporating a fascinating mix of engineering and psychology, is being deployed on highways to save lives by targeting a deadly problem: wrong-way driving crashes. The statistics are alarming. Nationwide, wrong-way crashes kill about 350 people a year and injure thousands more, according to the National Highway Traffic Safety Administration. Walter Boot, associate professor in the FSU Department…

Teaching Your Team How to Run With Scissors – Wayfair Tech Blog

Being a long distance runner has taught me a lot about being an engineering leader. I’ve spent the last 15 years running races of all distances, some of which were great, and others that we’ll just call “learning opportunities”. I’ve also spent those same 15 years honing my skills as an engineering leader, during a career filled with great wins and more than a few “learning opportunities” as well. This article comes at a bittersweet moment in my career. I…

A novel approach to recycling construction waste

Aerated concrete made of brick (rear); aerated concrete made of sand-lime stones (front). Credit: Fraunhofer IBP The construction industry is one of the most resource-intensive sectors of the German economy. The nation’s buildings constitute a vast store of raw materials, harboring some 100 billion metric tons of materials that could be recovered and returned to the material cycle at the end of their service life. Four Fraunhofer Institutes have joined forces in the BauCycle project to kick-start recycling of sand…

Transforming Payments & Empowering Developers: Meet the Uber Amsterdam Tech Team

By Morgan Sebree Given Amsterdam’s appreciation for multi-modal transportation—think bicycles pedaling across any one of the city’s 1,281 bridges or boats navigating its 31 miles of canals—it’s no wonder that the European city is home to Uber’s largest engineering office outside of the U.S. Opened in January 2015, Uber Amsterdam is home to two core technical teams: Payments and Developer Platform. The Payments team is responsible for developing reliable, secure, and seamless payment experiences for users on the Uber platform.…