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Engineering News

Deprecating TLS 1.0 and 1.1 on api.cloudflare.com

On June 4, Cloudflare will be dropping support for TLS 1.0 and 1.1 on api.cloudflare.com. Additionally, the dashboard will be moved from www.cloudflare.com/a to dash.cloudflare.com and will require a browser that supports TLS 1.2 or higher. No changes will be made to customer traffic that is proxied through our network, though you may decide to enforce a minimum version for your own traffic. We will soon expose TLS analytics that indicate the percent of connections to your sites using TLS…

Lighter than Lightweight: How We Built the Same App Twice with Preact and Glimmer.js

Time in milliseconds; lower is better. SSR = Server-side rendered, CSR = Client-side rendered. Render time measured in CSR mode, rehydration time measured in SSR mode. Both flavors performed very well. The SSR variants in particular showed dramatic improvement in First Meaningful Paint, reducing the time before a member sees useful content by over one second compared to the CSR variants. Based on our test, Glimmer.js seemed to slightly outperform Preact at achieving First Meaningful Paint and Rehydrating/Rendering the page,…

Printing the ‘soft’ robots of the future

Three-dimensional printing offers unique advantages, but still faces many challenges, for fabricating small, flexible robots that can navigate through the human body and other confined spaces, according to a review in the journal Science and Technology of Advanced Materials. Researchers at South Korea’s Jeju National University examined the latest research and developments in fabricating soft robots using 3-D printing technologies. Their study concludes that 3-D printing is well suited to build robots that have complex external shapes together with an…

PET myocardial perfusion imaging more effective than SPECT scans in detecting coronary disease — ScienceDaily

Patients who receive cardiac positron emission testing (PET) imaging instead of single photon emission computed tomography (SPECT) scan experienced a significant increase in the detection of severe obstructive coronary artery disease, according to researchers at the Intermountain Medical Center Heart Institute in Salt Lake City. Both, PET and SPECT scans are nuclear imaging techniques that provide metabolic and functional information of the heart. PET scans provide better image resolution and quality, but have not yet gotten widespread adaptation compared to…

Using pedometers in a short term walking program boosts long term activity — ScienceDaily

Experts have found that people who use pedometers to count their steps as part of a 12-week walking programme, can have a healthier, more active lifestyle three to four years later. Brisk walking for 30 minutes or more daily on most days of the week can help adults and older adults to achieve important health benefits. Researchers at St George’s, University of London, compared adults and older adults in two 12-week walking programmes who were using pedometers, with people who…

Scientific analysis of diamond impurities — known as inclusions — reveal naturally forming ice crystals and point to water-rich regions deep below the Earth’s crust — ScienceDaily

A UNLV scientist has discovered the first direct evidence that fluid water pockets may exist as far as 500 miles deep into the Earth’s mantle. Groundbreaking research by UNLV geoscientist Oliver Tschauner and colleagues found diamonds pushed up from the Earth’s interior had traces of unique crystallized water called Ice-VII. The study, “Ice-VII inclusions in Diamonds: Evidence for aqueous fluid in Earth’s deep Mantle,” was published Thursday in the journal Science. In the jewelry business, diamonds with impurities hold less…

Flat gallium joins roster of new 2-D materials — ScienceDaily

Scientists at Rice University and the Indian Institute of Science, Bangalore, have discovered a method to make atomically flat gallium that shows promise for nanoscale electronics. The Rice lab of materials scientist Pulickel Ajayan and colleagues in India created two-dimensional gallenene, a thin film of conductive material that is to gallium what graphene is to carbon. Extracted into a two-dimensional form, the novel material appears to have an affinity for binding with semiconductors like silicon and could make an efficient…

Metal-organic compounds produces new class of glass — ScienceDaily

Lightning and volcanos both produce glass, and humans have been making glass from silicon dioxide since prehistory. Industrialization brought us boron-based glasses, polymer glasses and metallic glasses, but now an international team of researchers has developed a new family of glass based on metals and organic compounds that stacks up to the original silica in glass-forming ability. Glass-forming ability is the ability of a liquid to avoid crystallization during cooling. “Glass is a liquid frozen into a solid-like material in…

Quality assessment of 360 video view sessions | Engineering Blog | Facebook Code

At Facebook we’re continuously pushing the boundaries of 360 technology. We’ve pioneered ideas such as offset cubemaps, dynamic streaming, and content-dependent streaming. With every new technology, it’s important to be able to assess the quality of the immersive experience compared with previous approaches in terms of things like resolution, bitrate, or structural similarity. A reliable quality assessment (QA) workflow can provide consistent criteria for comparing 360 view sessions and help us make data-driven decisions about whether to adopt a new…

Now Streaming! – Netflix TechBlog – Medium

Compression Performance In December 2016, we introduced AVCHi-Mobile and VP9-Mobile encodes for downloads. For these mobile encodes, several changes led to improved compression performance over per-title encodes, including longer GOPs, flexible encoder settings and per-chunk optimization. These streams serve as our high quality baseline for H.264/AVC and VP9 encoding with traditional rate control settings. The graph below (Fig. 3) demonstrates how the combination of Dynamic Optimization with shot-based encoding further improves compression efficiency. We plot the bitrate-VMAF curves of our…