Colorado Senate District 30 race Q&A: Julia Varnell-Sarjeant, Chris Holbert and Steve Peterson | White Cells Filter

For a practical view on working with carbon monoxide cells, I reached out to [Victor Aprea] of Wicked Device. [Victor] created the Air Quality Egg, an open source air quality measurement device. Victor found that getting accurate carbon monoxide readings requires more than just reading the sensor. Sensor response curves change based upon environmental conditions. Temperature is the big one – CO readings can be off as much as 15% in extreme temperature situations. Atmospheric pressure is another factor, as are the influence of other gasses. [Victor] spent quite a bit of time working out the curves and modifying the firmware of the Air Quality Egg to compensate. He wrote several informative blogs on his work: here, here, and here. [Victor] also has found cross-sensitivity with other gasses is an issue. Thankfully for the particular CO sensors used in the Air Quality Egg it isn’t quite as big a problem as the environmental issues.

The vast majority of carbon monoxide sensors use electrochemical cells, very similar to fuel cells we often see here on Hackaday. The typical carbon monoxide sensor is a two or three terminal device with two or three electrodes: a working electrode, counter electrode, and sometimes a reference electrode. All the terminals contact an electrolyte fluid. In carbon monoxide cells, the electrolyte is often sulfuric acid.

The FDA has approved adalimumabadaz (Hyrimoz, Sandoz)—the third biosimilar to Humira (AbbVie)—but a legal settlement between the two companies means Hyrimoz won’t be available in the U.S. until 2023.

And about: “They also require periodic calibration and bump testing, which means either investing in an expensive calibration gas system, or sending the sensor back to the manufacturer and paying a fee. Much of this is required because electrochemical cells don’t age well. Their response decreases over time. The cells can also be damaged if exposed to chemicals and certain solvents.” It would seem more reliable to use https://en.wikipedia.org/wiki/Photoacoustic_spectroscopy than chemical cells. Although I wonder to what extent it can be miniaturized, made power efficient (but what would be more expensive: the periodic calibration price, or “price of energy” X “difference in energy consumed during a calibration interval”?)

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electrode     A device that conducts electricity and is used to make contact with non-metal part of an electrical circuit, or that contacts something through which an electrical signal moves.

The work, published May 30 in Science Robotics, combines technologies pioneered by Joseph Wang and Liangfang Zhang, professors in the Department of NanoEngineering at the UC San Diego Jacobs School of Engineering. Wang’s team developed the ultrasound-powered nanorobots, and Zhang’s team invented the technology to coat nanoparticles in natural cell membranes.

“The requirements of natural justice must depend on the circumstances of the case, that nature of the enquiry, the rules under which the tribunal is acting, the subject matter that is being dealt with and so forth. …. Whatever standard is adopted, one essential is that the person concerned should have a reasonable opportunity of presenting his case.”

ReLEx SMILE utilizes the high-precision laser to create a lenticule inside the cornea and access incision in a single treatment step. Incisions are made through microscopic photo-disruptions of tissue, created by ultrashort pulses.

– the WLC representing complainants or informants and Isaacs, Achmat, Ensor, Geffen, Feinberg and Adler – prepare heads of argument or representations on the status of these documents; the use to which they could be put; what impact the Constitution of the Republic may have, tenets of natural justice, administrative law, labour law and other relevant considerations which could be brought to bear on these documents. In short, the issue might be stated as examination of the relevance of these documents for purposes of conducting a fair enquiry or investigation in view of the parameters of the Terms of Reference.

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