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Category: Construction Engineering

Proposed Regulatory Text for New Post-Tensioning OSHA Regulations

The following is an bridged version of the proposed regulatory text for the new post-tensioning OSHA Regulations as reported by Ironworkers.org (Sections #1, 6 and 9 relate to the post-tensioning activities). The controlling contractor shall ensure that the following is provided and maintained: (1)   Adequate access roads into and through the site for the safe delivery and movement of derricks, cranes, trucks, other necessary equipment, and the material to be erected and means and methods for pedestrian and vehicular control.  Exception: …

An Application-Level Edge Cache to Make Slack Scale

Professor Robin Dunbar, when studying Neolithic farming villages and primate troupes in the 90s, theorized that the maximum number of stable relationships we can keep is around 148, known popularly as Dunbar’s number. This upper bound is due to the mental dossier kept on individual’s relationships, but more importantly, the number of cross relationships between everyone else, whose number grows geometrically. Today, your Slack client is the window into your workplace, and teams have grown into the tens of thousands…

Reducing Image File Size at Etsy

Serving images is a critical part of Etsy’s infrastructure. Our sellers depend on displaying clean, visually appealing pictures to showcase their products. Buyers can learn about an item by reading its description, but there’s a tangibility to seeing a picture of that custom necklace, perfectly-styled shirt, or one-of-a-kind handbag you’ve found. Our image infrastructure at its core is simple. Users will upload images, we convert them to jpegs on dedicated processing machines (ImgWriters) and store them in large datastores (Mediastores).…

A viral way to share music when a simple text, meme, or gif isn’t enough

Two hackathon veterans discovered Square’s APIs at the SXSW Hackathon and the infinite possibilities they offer to improve their existing and new apps. Eric King and Damola Omotosho are two old friends who met at Virginia Tech while earning their engineering degrees. After graduation, they both ended up pursuing a master’s degree in engineering before working full-time in tech. While they were off to a strong start in their early careers, they had a desire to shake things up and find…

How Data Science Helps Power Worldwide Delivery of Netflix Content

by Andrew Berglund Have you ever wondered where your video comes from when you watch Netflix? We serve video streams out of our own content delivery network (CDN), called Open Connect, which is tailored to one specific application: delivering internet TV to our members around the world. This system is the cornerstone of every Netflix video experience — serving 100% of our video, over 125 million hours every day, to 100 million members across the globe! In this post, we introduce some…

Novel technology applied to replace aging bridge

A new bridge replacement system allows for rapid and cost-effective construction. Credit: Majid Talebi/ University of Delaware America’s bridges received a grade of C+ on the 2017 Infrastructure Report Card, put out by the American Society of Civil Engineers (ASCE). Aging is a factor in this score—almost four in 10 of the 614,387 bridges in the U.S. are 50 years or older, and the average age keeps climbing. But repair and rehabilitation are extremely costly—the most recent estimate puts the…

Managing resources for large-scale testing | Engineering Blog | Facebook Code

As more people across the world connect on Facebook, we want to make sure our apps and services work well in a variety of scenarios. At Facebook’s scale, this means testing hundreds of important interactions across numerous types of devices and operating systems for both correctness and speed before we ship new code. Last year, we introduced the Facebook mobile device lab, which lets engineers run tests by accessing thousands of mobile devices available in our data centers. Since then,…

Open Sourcing Daytona: A Framework For Automated…

By Sapan Panigrahi and Deepesh Mittal Today, we are pleased to offer Daytona, an open-source framework for automated performance testing and analysis, to the community. Daytona is an application-agnostic framework to conduct integrated performance testing and analysis with repeatable test execution, standardized reporting, and built-in profiling support. Daytona gives you the capability to build a customized test harness in a single, unified framework to test and analyze the performance of any application. You’ll get easy repeatability, consistent reporting, and…

Robot Prints a Building in 14 hours » Curious Cat Science and Engineering Blog

Robot Prints a Building in 14 hours Posted on May 20, 2017  Comments (0) The system consists of a tracked vehicle that carries a large, industrial robotic arm, which has a smaller, precision-motion robotic arm at its end. This highly controllable arm can then be used to direct any conventional (or unconventional) construction nozzle, such as those used for pouring concrete or spraying insulation material, as well as additional digital fabrication end effectors, such as a milling head. Unlike typical…