mamma #ProtectTheKids BildungAberSicher.ch

Let's beat the virus! It went around the world in days and after months it continues devastating our lifes, let's beat it! Let's use technology that can rund the globe in seconds and spread the word about how we can protect ourselves. Let's just do it!

@ghhughes I think sweat, skin and head oils, make the straps wear faster. Maybe some straps are just weaker also. We've had them breaking during use, no stress applied. I wonder why 3M doesn't do something to improve it

Even after 41 programed don and doff cycles over 41 hours I still couldn't get the wrinkled crepe paper look that 3M Aura straps get when they are worn out and likely to break. Maybe the motion of the Chatillon TCD 225 Force Testing Machine is too slow, smooth and even, unlike how people put on their masks. I need to figure out how to get a better, but repeatable, analog to how people use their masks in real life to measure strap tension failures. A graph shows spikes as each mask is pulled to 3x the relaxed length for 5 seconds to simulate donning, then held at 2.5x for 1 hour to simulate wearing. Then down to no stretch to simulate taking the mask off. The "worn distance" tension in the first hour starts at 350 grams of force or so, but by the middle of the 2nd hour it is below 300. By hour 41 the tension is at 256 grams. The straps do get bagged out a bit after testing, but not as much as I expected based on wearing 3M Auras. The tension set just after removing from the machine was only 1.11x. (I made two dots on the new mask straps at 100mm apart, and now they are 111mm apart. I'll measure them again after a few days to see how much the straps recover.)

@VentiloAngel @Heena77142958 😭 indoor smokers ruin everything

@Heena77142958 9 appartment, at least 6 of them are smokers.... probably 7.

Indoor air quality: scared of living near a gas station? I measured one today. PM2.5 and Voc: perfectly normal. Meanwhile my own apartment building hallway: nearly 7× above Quebec's smog alert threshold. The threat is invisible, odorless, and it's inside your home. Pollutants aren't where you think. Monitor, don't guess. You can't control what you don't measure. P.S. I sometimes read people on Reddit worried sick about living near a gas station or a highway — while sleeping next to a real monster, afraid of a doll.

@drseanmullen @Covidsafe2025 @Engineer_Wong @NukitToBeSure This is exactly how I feel about anything covid precaution. Any health precautions also. People don't get it

I mean, it’s not a friend or a hobby or a drug… so no, I’ll probably never like dressing up like Darth Vader just to survive in this dystopia. But yeah — it’s cool. I love health tech. I teach health tech. This is my jam. And if I can’t have a hoverboard or a flying DeLorean, at least I can breathe with my N99 in the Age of Denial — confident enough to take on COVID or bird flu in a room filled with ignorance and disunderstanding.

New toy. So if I wear the AirFanta Wear + 1st + 2nd gen Respiray, with an N99 respirator fit snug against my clean-shaven face, I’m good right? @Engineer_Wong @NukitToBeSure #teaser

I wants it

@Engineer_Wong @Michaeltikus @DrMLivingston I Vacuum the outside of the 3pros every few weeks and get a lot of the large particles out (like lint on the clothes dryer). I do wonder if I can visualy determine it's time to change the filters.

@Michaeltikus @DrMLivingston It needs to be changed when the filter turns grey. When dust has already accumulated into piles, it's too late.

Found my daughters @Engineer_Wong Airfanta She took this to school and it came time to change the filter. 🤮

@Ninawildflower So you think phone/media use is harmless, needs to be limited, what's your opinion on that and why? (I'm genuinely curious as I have to figure it out as a parent)

A quick Google search reveals that "digital detox" and "digital dementia" have no basis in reality. In fact "detox" has no basis in reality.

@BGatesIsaPyscho But what had the guy done?

Tourists paying €8.00 for a Sparkling Mineral Water & £19.00 for a Cheese Sandwich get treated to some free European cultural enrichment entertainment at lunch. This is Europe now.

@ghhughes But it also smelled but not noticeable with masks. I wonder if the VOCs are attached to dust, or the mask does hinder some smell to go through.

@ghhughes We had recently a dusty project, masks were visibly dark outside after the work was done. (3m Aura). We didn't even realise that until we took them off and saw the dirt. Glad I didn't breath in that dust...

Why you can't always trust initial breathing resistance tests like mine: Filter Loading I have posted a number of breathability comparison tests using brand new filters, such as a duckbill breathability chart. My tests are "initial" breathing resistance, and think the same is true for those done by Lloyd Armbrust on his fancy TSI machine. The rank order in these charts should remain accurate for new masks and filters used in relatively clean environments, such as for protection from airborne disease. But in dusty industrial environments, the breathability of particulate respirators can change over time as the filter gets loaded with particles. And different particulate masks and filter media can behave differently, in ways the manufacturers and NIOSH do not inform users of. Respirator filters do not come with performance data sheets that illustrate the loading curve. Attached is an example of how loading can change breathability of particulate respirator filters, from a 2014 3M sell sheet. The "Competitor B" example starts with lower breathing resistance than the 3M 2091 pancake filter, but with a small amount of salt loading on the filters (0.02 grams) they switch places in terms of which is more breathable. Different kinds of filtration media, such as mechanical, electret or combination, can have different loading curves. The loading response is one of the ways a testing lab can tell what kind of filter media is being tested. Doing loading testing takes $100,000+ machines that I don't have access to. But I'm always looking for opportunities to see and share advanced test data on current respirator filters that test for things I can't. Conclusion In practice, this is why companies like 3M say to use respirator filters until they are hard to breathe through. NIOSH filtration testing uses loading during testing to insure the filters still work under loading. So you are still safe so long as the particulate filter is not damaged and your mask fits well. But which masks will be most breathable when used in dusty environments is still largely a guessing game. The filter loading is a separate issue from how long you can effectively wear an N95, because in that case the effectiveness may depend more on how well the mask continues to hold it's shape well to make an airtight seal on your face. --- Thanks to LazarusLong13 for the link to the sell sheet.

the last single of my upcoming fourth EP is coming out may 8th. it’s called ‘my purest form is a lie’ and it’s a song about music and the female experience of making it. this is the cover (which was shot by my dad btw) and you can pre-save the song below ♡

les parisien.nes de gauche fans de pop alternative j’ai besoin de vous 🤍j’organise un concert antivalidiste au petit bain le 25 juin, avec un lineup 100% féminin, en autodéfense sanitaire avec masque obligatoire pour garantir l’accessibilité! si vous êtes là venez me soutenir <3

@Engineer_Wong Do you think for large air handlers e.g. in isolation units, hospitals, it would be effective?

Many commercial air purifiers are equipped with a built-in UV lamp and claim that it can kill airborne bacteria. However, this claim is misleading. Most commercial purifiers use H12 or higher-grade HEPA filters, which alone capture over 99.9% of viruses and bacteria in a single pass. Even if the UV lamp could kill 100% of the remaining microbes within the one second that air passes through it, the overall improvement in efficiency would be less than 0.1%. Therefore, the assertion that the UV lamp helps disinfect the air is merely a marketing gimmick. The true purpose of the UV lamp is to irradiate the filter surface to inhibit fungal growth. Bacteria and viruses generally cannot survive long on the filter, but if the filter becomes damp and is left without airflow for an extended period, mold can proliferate on the dust accumulated in the HEPA filter under suitable temperature and humidity, occasionally causing unpleasant odors. The downsides of UV lamps include the generation of trace amounts of ozone and accelerated degradation of the filter material, which shortens the filter’s lifespan. Consequently, I still do not recommend using UV lamps inside air purifiers. Simply running the air purifier 24/7 can resolve the issue of mold growth on the filter.

@ScottFarbman @Engineer_Wong I think carbon won't help much with ozone, NOx. It is good for the indoor VOCs though

@Happy_live_safe @Engineer_Wong You are introducing them at a much higher rate with mechanical ventilation…. Either way, I think you are missing the point, which is adding activated carbon to the set up would be beneficial for many people in areas with high ozone, NO2, and other non particulates.

This is a device I use in my office: it draws outdoor air from outside the window into the room, passes it through a filter, and then vents it indoors. The excess air pressure pushes indoor air out through the gaps around the door. This way, indoor carbon dioxide, particulate matter, and VOCs can be reduced to very low levels. Even an air purifier with activated carbon cannot achieve this effect, because air purifiers cannot lower CO2 concentration. This device is modified from an AirFanta 3Pro. I reversed the fan installation and connected two reducing adapters so that the final diameter matches that of this plastic expandable duct. Finally, I sealed the window with a sealing fabric, leaving only an opening the same size as the duct. Its only drawback is the lack of heat exchange, so it requires some additional air conditioning load. It would be unsuitable in very cold or very hot places.

@Engineer_Wong Gosh, early 2020 a self sewn cloth mask improved my outdoor experience so much, later surgical masks did it again. So even lousy fit helps against pollen (or it was coincidence?)

It's now pollen season in northern China. Every year at this time, many people experience allergic reactions. I joined a community for pollen allergy sufferers, but I was surprised to find that they don't consider masks a primary protective measure, claiming they're ineffective. I suspect it's highly likely that they simply don't know how to choose and wear masks correctly. Mask selection requires specialized knowledge; if chosen and worn casually, it's hard to achieve the desired effect. This is an area where experts need to continuously popularize science.

@ScottFarbman @Engineer_Wong But those outdoor pollutants would still get inside, unless your room/house is extremely airtight, and since they would react with vocs inside, your best bet is still to dilute indoor pollutants

@Engineer_Wong Outdoor sensors in our area read as high as 0.9 ppm ozone in our area last year and frequently see 0.6-0.80 ppm I haven’t heard it’s not a concern by the time it hits your window. I’ll look into this, but that’s not what I’ve seen. Infiltration doesn’t bring in 100s cfm of air

@holo_cene @1goodtern Better than the sick coughing assholes who choose to sit besides us and force coughs on our faces

everyone avoiding sitting next to me in the crowded subway because they’re scared of my mask when i’m the safest person to sit next to, ironic

@DrGrahamLJ I understood that clearing the amyloid does not improve cognitive function. It seems correlation and not causation. It seems p-tau has a causation function and slowing it's build up slows decline, and reducing it improves cognition. But I am not a doctor...

Who here thinks it’s time we dropped the ‘amyloid causes Alzheimer’s’ narrative? I do. bbc.co.uk/news/articles/…

@holo_cene At least she agrees with testing. Maybe she could mask for the few days after exposure and test on day 5 approximately, so you save one test (but then there is the cost for masks...)

she thinks i’m just being annoying and it’s overkill like… pluslife tests are expensive! i’m not doing this for fun. we could be a proper covid conscious family if she just improved her precautions a little… but i’m not giving up. this year i made her mask again so there’s hope

my strategy to prevent my mom from exposing my dad when she goes to the restaurant is making her saline nose wash + CPC for 2 days after, and testing her twice with pluslife, 48 hours and 72 hours post exposure. this is the best i can do because she won’t stop going 😣

@steadirob Eww

Why do ants like to collect their dead at warm and high voltage places in my coffee machine or air conditioner? 😤🫩

@NukitToBeSure Thanks a lot.

@Happy_live_safe This is the best study on it at the moment: boeing.cn/cti/downloads/… TLDR: Usually less of an issue than sunlight or fluorescent lights at the power levels we're working with. Outside of museums should not be an issue until we are looking at a decade plus of exposure.

@NukitToBeSure do you have experience/knowledge on material degradation under UVC lights? I am researching, also 254 and other lengths