In acoustics this movement of air is called particle velocity. The Microflown sensor is based upon MEMS technology, and uses the temperature difference in the corss section of two extremely sensitivy platinum wires that are heated up to 200°C in order to determine Acoustic Particle Velocity. When air flows across the wires, the first wire cools down a little and due to heat transfer the air picks up some heat. Hence, the second wire is cooled down with the heated air and cools down less than the first wire. A temperature difference occurs in the wires, which alters their electrical resistance. This generates a voltage difference that is proportional to the Particle velocity and the effect is directional: when the direction of the airflow reverses, the temperature difference will reverse too.
DJI Phantom Quadcopter with GoPro Mount
The DJI Phantom Quadcopter with GoPro Mount is a remote controlled, four-propeller quadcopter with a removable GoPro camera mount for capturing POV footage of flight. The compact and lightweight Phantom is ready-to-fly right out of the box and it includes the remote control unit and receiver, which gives the device a transmission range of up to 984.25′ (300m). The Phantom also features an intelligent Naza-M + GPS multi-rotor autopilot system, which supports two flight modes and a failsafe function that will automatically trigger the device to land safely when control is lost.
via DJI Phantom Quadcopter with GoPro Mount CP.PT.000001 B&H Photo.
Xen and the Art of Project Management
Before Xen became part of the foundation, Kurth says, many people in the Linux community favored KVM. “The thinking really went along the lines of: KVM=Linux=Good. Xen=Citrix=Bad.” With the open source community connecting Xen with Citrix, the project’s features and open source nature were overlooked. Kurth says that Xen’s new role as a Linux Foundation Collaborative Project has changed how the community and press view it.
Mirror’s online traffic soars in wake of Sun paywall
Mirror Group Digital enjoyed a surge in daily browsers of nearly 20% last month, after the Sun introduced its website paywall
via Mirror’s online traffic soars in wake of Sun paywall | Media | theguardian.com.
Groundbreaking Results for High Performance Trading with FPGA and x86 Technologies
As market data enters the switch, the Ethernet frame is parsed serially as bits arrive, allowing partial information to be extracted and matched before the whole frame has been received.
Then, instead of waiting until the end of a potential triggering input packet, pre-emption is used to start sending the overhead part of a response which contains the Ethernet, IP, TCP and FIX headers. This allows completion of an outgoing order almost immediately after the end of the triggering market feed packet.
The overall effect is a dramatic reduction in latency to close to the minimum that is theoretically possible.
via Groundbreaking Results for High Performance Trading with FPGA and x86 Technologies | Low-Latency.com.
Solr: The Most Important Open Source Project You’ve Never Heard Of
Lucene is used by many companies and groups as the foundation for their search engines. These organizations include AOL, Disney, and Eclipse. Lucene’s chief selling point is that the indexing engine, with a footprint of a mere megabyte of RAM, can index up to 150GBs per hour of text on commercial off-the-shelf hardware. That’s darn good!
Solr comes into the picture as the search platform front-end for Lucene. It provides full-text search, including the ability to handle such formats as Microsoft Word and PDF with Apache Tika; hit test highlighting; and faceted search, which incorporates free text searching with topic taxonomy indexing.
via Solr: The Most Important Open Source Project You’ve Never Heard Of.
Under the hood, Solr is written in Java and it relies on Lucene for its core functionality. It usually runs within a servlet container such as the Jetty HTTP server and Javax.servlet.
Hundreds of Innovators Tell Congress to Stop Patent Troll Abuse and Legislate Cheaper, Faster Ways to Fight
The Alliance letter calls for legislation that would:
– Create a cheaper, faster alternative to litigation by allowing the Patent Office to review – when evidence justifies – all business method and software patents so that start-ups have a chance to fight against the low-quality patents that are trolls’ best ammunition.
– Require the Patent Office to create public searchable demand letter databases so we can track the basis and volume of patent claims and quickly identify abusive trolls;
– Reduce litigation costs by requiring parties to pay if they demand more in discovery than “core” technology documents, which are generally all that is needed to know if a technology is infringing.
– Protect end-users of off-the-shelf hardware and software. Just as coffee shops should not be sued for providing wi-fi to customers, app developers should not be sued for using off-the-shelf APIs that infringe a patent.
Content Industry Drafts Anti-Piracy Curriculum for Elementary Schools
“It suggests, falsely, that ideas are property and that building on others’ ideas always requires permission,” Stoltz says. “The overriding message of this curriculum is that students’ time should be consumed not in creating but in worrying about their impact on corporate profits.”
All LinkedIn with Nowhere to Go
On one level, of course, this world of aspirational business affiliation is nothing new. LinkedIn merely digitizes the core, and frequently cruel, paradox of networking events and conferences. You show up at such gatherings because you want to know more important people in your line of work—but the only people mingling are those who, like you, don’t seem to know anyone important. You just end up talking to the sad sacks you already know. From this crushing realization, the paradoxes multiply on up through the social food chain: those who are at the top of the field are at this event only to entice paying attendees, soak up the speaking fees, and slip out the back door after politely declining the modest swag bag. They’re not standing around on garish hotel ballroom carpet with a plastic cup of cheap chardonnay in one hand and a stack of business cards in the other.
via All LinkedIn with Nowhere to Go | Ann Friedman | The Baffler.
In the same vein, actual business acumen and leadership skills usually take a back seat in the LinkedIn system to simple digital renown. Some of the best-known gurus on the site have had the most success in the realm of . . . thinking about stuff.
PayPal Nears Deal for Braintree Payments
The deal for Braintree would give PayPal access to data and lucrative transaction fees from Braintree’s expanding network, which currently processes more than $10 billion annually for companies like OpenTable, Uber Technologies and Airbnb. Braintree charges merchants a 2.9% commission and 30-cent transaction fee.
via PayPal Nears Deal for Braintree Payments – Digits – WSJ.