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Category: Mechanical Engineering

Accelerate large-scale applications with BOLT | Engineering Blog | Facebook Code

Highly complex services, such as those here at Facebook, have large source code bases in order to deliver a wide range of features and functionality. Even after the machine code for one of these services is compiled, it can range from 10s to 100s of megabytes in size, which is often too large to fit in any modern CPU instruction cache. As a result, the hardware spends a considerable amount of processing time — nearly 30 percent, in many cases…

How Trip Inferences and Machine Learning Optimize Delivery Times on Uber Eats

In Uber’s ride-hailing business, a driver picks up a user from a curbside or other location, and then drops them off at their destination, completing a trip. Uber Eats, our food delivery service, faces a more complex trip model. When a user requests a food order in the app, the specified restaurant begins preparing the order. When that order is ready, we dispatch a delivery-partner to pick it up and bring it to the eater. Modeling the real world logistics…

Advanced Technologies for Detecting and Preventing Fraud at Uber

Last week, we highlighted some presentations delivered during our second annual Uber Technology Day. In this article, engineering data science manager and Uber Tech Day presenter Ting Chen discusses how we leverage cutting edge systems to tackle fraud on our platform.    Fraud has a direct impact on Uber as well as user experiences on the platform. To combat bad actors,  Uber has a dedicated team of anti-fraud analysts, data scientists, and UX experts who work collaboratively on this issue.…

LEXO mug manufacturers getting the Burnout

Meet Burnout, the temperature-regulating travel mug guaranteed to quickly cool hot beverages such as coffee or tea to a drinkable zone of 140 degrees Fahrenheit within minutes and keep it there for hours — a quickness and longevity unmatched by competitors. Photo by Amy Parris. The Mizzou Engineering-affiliated makers of the popular LEXO travel mug are back with a brand-new mug with improved cooling time, cleaner lid, a lifetime guarantee and a new name — and all made right here…

Evaluating the noise of future aircraft

Credit: NASA/ Rami Daud, Alcyon Technical Services As air traffic continues to surge in the U.S., neighbors who live near airports are complaining about the escalating noise. All the while, the demand for faster aircraft that travel at supersonic speeds is accelerating. To address the expected noise levels of future aircraft, NASA’s Commercial Supersonic Technology project is already developing technologies focused on reducing the noise produced by an aircraft’s engine exhaust. Acoustics experts at NASA’s Glenn Research Center in…

Extending Magic Pocket Innovation with the first petabyte scale SMR drive deployment

Magic Pocket, the exabyte scale custom infrastructure we built to drive efficiency and performance for all Dropbox products, is an ongoing platform for innovation. We continually look for opportunities to increase storage density, reduce latency, improve reliability, and lower costs. The next step in this evolution is our new deployment of specially configured servers filled to capacity with high-density SMR (Shingled Magnetic Recording) drives. Dropbox is the first major tech company to adopt SMR technology, and we’re currently adding hundreds…

Building data science teams to have an impact at scale | Engineering Blog | Facebook Code

Facebook’s vast scale and range of engineering initiatives — in particular in the context of infrastructure engineering — present a tremendous opportunity for data science to tackle interesting, important challenges and to affect products and services used by billions of people every day. Data scientists on the Facebook infrastructure team work on problems that range from designing machine learning algorithms for content delivery networks (CDNs), to building statistical models that forecast data center demand, to designing tools that can detect…

Novel system mimics focus activity of the human eye

Shown: Range of focus for various eye refractive conditions. Myopia shifts the focal range closer, causing bad far sight. Hyperopia shifts the focal range farther (allowing focusing ability beyond infinity), causing bad near sight and lens fatigue since the crystalline lens does not relax even when looking at infinity. Presbyopia reduces the focal range and moves the nearest plane of focus away from the eye. Credit: Nitish Padmanaban/Stanford With aging comes deteriorating vision. At SIGGRAPH 2018, attendees will have the…

Robotic work cell conducts high-throughput testing instantly

Sandia National Laboratories materials scientist Brad Boyce watches as the Alinstante robotic work cell scans a 3D-printed part to compare what was made to the original design. This test part was devised to push the limits of 3D printing technology. The goal of Alinstante is to speed up the testing of 3D-printed parts and materials science research. Credit: Randy Montoya Today, with 3-D printing, you can make almost anything in a matter of hours. However, making sure that part works reliably…

StatePoint Liquid Cooling System: A new, more efficient way to cool a data center | Engineering Blog | Facebook Code

Facebook data centers are some of the most advanced energy- and water-efficient facilities in the world. By cooling our facilities with outdoor air and using efficient cooling strategies such as our direct evaporative cooling system, our data centers use 50 percent less water than a typical data center. To achieve these results, we employ a variety of cooling strategies tailored to the specific environmental considerations for each data center. In locations with environmental challenges — like high levels of dust,…