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Category: Mechanical Engineering

With the right tools, we can mine cities

Cities like Melbourne are a store for such huge amounts of resources that they could be used as urban mines. Credit: Donaldytong (own work)/Wikimedia From 1900 to 2010, the amount of materials accumulated in buildings and infrastructure across the world increased 23-fold. We are depleting our resources at unprecedented rates. Instead of extracting dwindling raw materials from nature at ever-increasing cost, the time has come to start re-using materials from buildings and infrastructure in our cities. We have been working…

‘Origami’ lattices with nano-scale surface ornaments

Credit: Delft University of Technology Inspired by origami, the Japanese art of paper folding, researchers at TU Delft are developing an alternative to 3-D printing that gives the final products many more functionalities than what is possible with 3-D printing. Such functionalities could, for instance, be used in medical implants or devices incorporating flexible electronics. In their publication in Science Advances on Wednesday November 29th, the scientists report successfully applying their technique to lattice structures. Lattice structures are used in…

Engineering an Uneventful New Year’s Eve

Software engineers Matt Schallert, Katie Tezapsidis, Carissa Blossom, and Tom Croucher discuss what it takes to prepare our systems for holidays and other high traffic events. While most spend New Year’s Eve watching the ball drop or celebrating with friends (festive party hat in tow), Uber Engineering has historically treated the holiday like a final exam. With users worldwide relying on Uber for safe and reliable transportation to and from their celebrations, New Year’s Eve often marks our highest traffic…

New 3-D printer is ten times faster than commercial counterparts

MIT engineers have developed a new desktop 3-D printer that performs up to 10 times faster than existing commercial counterparts. Whereas the most common printers may fabricate a few Lego-sized bricks in one hour, the new design can print similarly sized objects in just a few minutes. The key to the team’s nimble design lies in the printer’s compact printhead, which incorporates two new, speed-enhancing components: a screw mechanism that feeds polymer material through a nozzle at high force; and…

Turning carbon dioxide into fuel and useful chemicals — ScienceDaily

MIT researchers have developed a new system that could potentially be used for converting power plant emissions of carbon dioxide into useful fuels for cars, trucks, and planes, as well as into chemical feedstocks for a wide variety of products. The new membrane-based system was developed by MIT postdoc Xiao-Yu Wu and Ahmed Ghoniem, the Ronald C. Crane Professor of Mechanical Engineering, and is described in a paper in the journal ChemSusChem. The membrane, made of a compound of lanthanum,…

2017 Pinterest Engineering intern projects – Pinterest Engineering – Medium

Every summer Pinterest welcomes a new class of software engineering interns to our San Francisco HQ. Each intern (or Pintern, as we say) works on an important technical project that directly impacts our product. Pinterns demo their projects weekly in front of the whole company at Friday Q&A, hosted by our co-founders and other leaders across Pinterest. In this post you’ll learn about some of this year’s class and what they built during their internship. Caroline Lo | Stanford University,…

Screaming Circuits: Power Distribution – To route, or To Plane

Power distribution, on a PC board, can come in a number of forms. The three most common methods are You can route power and ground. You can use surface layer floods. You can use internal planes. After component positioning, you’ll need to look at power and ground distribution. With a two layer board, your options are limited to individually routing power and ground, or using a polygon fill, also called a flood or pour.For simple, low speed…

Towards better understanding of railway ballast

Amplitude of the displacement field after a train passes on the track. The left-hand figure corresponds to a simulation with homogeneous ballast and the right-hand image to a simulation with heterogeneous ballast. Credit: Lucio de Abreu Corrêa, Laboratoire de Mécanique des Sols, Structures et Matériaux (CNRS/CentraleSupélec) SNCF engineers have been using mathematical models for many years to simulate the dynamic behavior of railways. These models have not been able to take into account large portions of the track have been…

Photocrosslinkable, thermoreversible, type-I collagen bioink for photolithographic printing

Bioprinting of collagen methacrylamide (CMA) scaffolds. Credit: Dr. David Shreiber A group of biomedical engineers from Rutgers, The State University of New Jersey have leveraged a unique combination of properties of methacrylated collagen to demonstrate its potential as a bioink capable of simple, photolithographic printing of 3D scaffolds for tissue engineering and regenerative medicine. Type-I collagen is the most ubiquitous protein in the human body. Chief among the fibril forming collagens, type-I collagen gives many soft tissues strength and structure.…

Autoscaling Pub/Sub Consumers | Labs

Spotify’s Event Delivery system is responsible for delivering hundreds of billions of events every day. Most of the events are generated as a response to a user action, such as playing a song, following an artist or clicking on an ad. All in all, more than 300 different types of events are being collected from Spotify clients. The Event Delivery system is one of the core pillars of Spotify’s data infrastructure since almost all data processing depends, either directly or…