Just like living ecosystems, web services form a complex artificial system consisting of tags and the user-generated media associated with them, such as photographs, movies and web pages. When drawing an analogy between biological and artificial ecosystems, tags could be regarded as species and human users as hidden environmental resources.
* This article was originally published here
Wednesday, 17 April 2019
Investigators explore temperature-triggered devices for gastrointestinal therapies
Gastrointestinal devices such as stents, endoscopic tubes, balloons and drug delivery systems can help clinicians treat patients with a range of conditions. But currently available methods for triggering where and when drugs are released or when a device is triggered to disassemble or change shape are often slow, which can restrict the utility of such tools. Investigators from Brigham and Women's Hospital and MIT are designing devices that can be triggered by the ingestion of a warm liquid to break down into smaller segments that can be excreted. In proof-of-concept experiments in preclinical models, the team tested two devices—one that could be induced to change conformation in the esophagus to exit following the delivery of a drug, and the other that could reside unperturbed in the stomach until intentionally triggered. The team's results are published in Science Translational Medicine.
* This article was originally published here
* This article was originally published here
A sliding mode control scheme for nonlinear positive Markov jumping systems
Researchers at Anhui University in China have recently developed a new method to enable sliding mode control in a class of nonlinear positive Markov jumping systems (MJSs) with uncertain parameters. Their approach is outlined in a paper published in Springer's International Journal of Control, Automation and Systems.
* This article was originally published here
* This article was originally published here
U.S. energy use rises to highest level ever
Americans used more energy in 2018 than in any other year, according to the most recent energy flow charts released by Lawrence Livermore National Laboratory (LLNL). Overall total energy consumption rose to 101.2 quadrillion BTU (or "quads"). The prior record, set in 2007, was 101.0 quads. Energy use went up by 3.6 percent from 2017, which also is the largest annual increase since 2010.
* This article was originally published here
* This article was originally published here
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