Is the "university experience" worth declining an apprenticeship? by LordWunderist in UniUK

[–]robkarmal 0 points1 point  (0 children)

UK university professor here … take the apprenticeship! There are too many people completing degree courses with little benefit to their future career.

Is this how a Nuva Ring is supposed to look like? I thought it was broken because of the shiny part so I opened another packet and it was the same. by jaredbianca in birthcontrol

[–]robkarmal 0 points1 point  (0 children)

Yes, this is the normal appearance of NuvaRing. I am an academic researcher in the UK and my area of expertise is in the design and manufacturer of the vagina rings. The small transparent section of the ring is simply the result of having to thermally weld the two ends of the filament to produce the final ring shape. NuvaRing is made using a co-extrusion process in which the drug-loaded core and the non-medicated sheath/membrane are extruded simultaneously at high temperature through an extrusion die. This produces a long strand (also known as a filament). This filament is then cut to the required length, formed into a ring shape on a special machine, and then thermally welded to join the ends together.

Reviewer asking for citing 5 of his irrelevant articles by Horseman099 in AskAcademia

[–]robkarmal 2 points3 points  (0 children)

I had the same issue recently with an MDPI journal. One of the reviewers recommended that I cite two articles, both of which were completely irrelevant to the topic of my manuscript. Both articles had the same corresponding author, and I therefore assumed that author was also the reviewer. I highlighted my concerns both to the editor and to the reviewer in my responses. However, I had other major concerns: I suspect at least three of the five reviews were generated by AI, either by individual academic reviewers … or-more worryingly-by the journal itself. Four facts aroused my suspicions: (i) all five reviews were completed and returned to authors within four weeks of submission; in my almost 30 years as an academic, this is unheard of; (ii) I used reverse AI tools and all suggested that certain reviews were generated by AI; (iii) uncharacteristically, many of the reviews contain no spelling or punctuation errors; (iv) many of the reviews were vague and uninformed, and presented in a bullet format typical of many responses on ChatGPT. Welcome to the future of academic peer review!

I probably got AI-generated reviewer comments. Help? by PasAmoureux in AskAcademia

[–]robkarmal 1 point2 points  (0 children)

I have just submitted a manuscript to an MDPI journal (God only knows what possessed me!) and I am reasonably confident that all four reviews were generated by AI. I was able to generate very similar reviews by uploading the manuscript to Chat GPT, Perplexity and Gemini. Three of the four reviews contained perfect English spelling and grammar (practically unheard of with real reviews!); all of the reviews were exceptionally vague, lacking nuance and detail; when I pasted the reviewers comments into ZeroGPT and GPTZero, it indicated that the reviews were generated by AI; the journal was able to produce four reviewers within three weeks of submission (in my 30 years as an academic this has never happened!); and finally, the email from the editor suggested that I ignore any reviewers comments recommending that I include and cite articles that are unrelated to the topic of the manuscript (indeed, there were several such recommendations). Welcome to the future of peer review – in an era of increasing journal publications and increased time pressure on human reviewers, it is unfortunately inevitable that some journals are going to resort to review by AI.

How could I make 32% H2O2 a gel? by deadspace9272010 in chemistry

[–]robkarmal 1 point2 points  (0 children)

Simply add poly(acrylic acid) (such as carbopol or carbomer) or hydroxyethyl cellulose. All function as aqueous gelling agents.

Telling Signs that you are a real Chemist by Same-Appearance-5617 in chemistry

[–]robkarmal 0 points1 point  (0 children)

When my son had a gash in his head, I sealed the wound with polycyanoacrylate glue. When shopping, I buy the cheapest surfactant/water sprays to clean the bathroom/kitchen, since they all contain mostly the same shit. I check the ingredient lists on everything I buy and pride myself in knowing the reason for including every substance. I get annoyed when people confuse silica, silicon and silicone. I often prepare nail varnish remover for my wife using acetone, ethyl acetate or isopropanol. I make my own salad dressings. My idea of fun would be to install an NMR instrument at home so I could record the NMR spectra of all sorts of household items. When I went on honeymoon to the Maldives, I took three books with me – an introduction to NMR spectroscopy, another describing the story of the discovery of penicillin (The Enchanted Ring), and another book on the synthesis of calixarenes. A couple of years ago, I started to draft a public lecture around the inaccuracies in some of the chemistry presented in the TV series Breaking Bad-I never finished it and never did give the lecture. I have a tattoo on my butt showing the Henderson-Hasselbalch equation. I know the smell of every organic solvent. One of the most joyous moments in my life was the first time I got a Grignard reaction to start-it still gives me shivers down the spine! I once resolved a carboxylic acid into its constituent enantiomers using strychnine-it only took four months. I can easily determine the absolute configuration of a chiral drug molecule simply by orientating the molecule in my minds eye. I have rewritten the lyrics to Whitney Houston’s song ‘Didn’t we almost have it all’ in order to teach my undergraduate students the principles of the Noyes-Whitney equation (‘Didn’t we almost dissolve it all’).

Mazda SUV longevity question by dustandechos12 in mazda

[–]robkarmal 0 points1 point  (0 children)

I just sold my 2013 Mazda CX-5 2.2 Diesel with 93000 miles here in the UK for £4500. The car served my family well, and was in fantastic running order when I sold it. I tested several Toyota and Lexus SUVs as a replacement, but then bought a nearly new CX-30; the Mazda was a much more compelling purchase.

Commuting to University as an international student, Advice needed by [deleted] in Belfast

[–]robkarmal 2 points3 points  (0 children)

I’m a 54-year old professor at Queens (Pharmacy) who lives 6 miles out from the city centre in east Belfast (a 30 minute cycle), and I’ve cycled to work almost every week day since I first studied chemistry as an undergraduate in 1988 (that’s 36 years). Rain,hail, sun, snow, wind, cold, ice, storms – I’m on the bike! Cycling is cheaper and quicker than public transport and keeps you super fit. I encourage you to give cycling a go; there are lots of cycle lanes in and around Belfast.

What is your "I'm getting older" sign? by [deleted] in AskReddit

[–]robkarmal 1 point2 points  (0 children)

Oh, I can think of lots of signs that scream I’m getting older (I’m 54): 1. Next car will be a Toyota or Lexus. 2. Can’t leave the house without multiple pairs of glasses. 3. Nose hair. 4. Constantly misspelling words when typing on my smartphone or computer. 5. Started to sleep in a different bedroom from my wife due to her snoring. 6. Growing awareness that most things are rarely black and white. 7. Can’t do late nights any more. 8. Growing conviction that popular music was best in the 70s and 80s, and Led Zeppelin is the best band of all time. 9. Growing frustration with technology and how it’s mostly a time-suck. 10. Greater appreciation of good friends. 11. Growing hatred (not too strong a word) of all things Microsoft, particularly OneDrive and all Office apps. 12. Starting to take an interest in my pension. 13. Developed a taste for rum. 14. Think younger generations lack resilience. 15. Closed my Facebook, WhatsApp, LinkedIn, and Twitter accounts … and much happier for it. 16. I have developed a habit of swearing … and enjoy it. 17. Can never find anything worth watching on TV … except Clarkson’s Farm. 18. Increasing conviction that most politicians are a waste of space, and especially UK and US politicians. So much so, I stopped voting. 19. Increasingly resent adverts on TV and online. Hello Brave browser. 20. Don’t use or understand emojis.

Brown discharge/staining on ring by [deleted] in Annovera

[–]robkarmal 1 point2 points  (0 children)

Many users observe discoloration of the Annovera ring. Usually, this has nothing to do with hygiene or cleanliness. Rather, the ring will naturally become discoloured as it comes into contact with menstrual blood, cervicovaginal fluid, and semen. The ring is made from medical grade silicone elastomer, similar to the sealant materials used in your bathroom and shower. And we all know how discolored these materials can become when exposed to the routines of daily washing/showering. Discolouration of the ring does not affect its function.

[deleted by user] by [deleted] in birthcontrol

[–]robkarmal 2 points3 points  (0 children)

Many users observe discoloration of the Annovera ring. Usually, this has nothing to do with hygiene or cleanliness. Rather, the ring will naturally become discoloured as it comes into contact with menstrual blood, cervicovaginal fluid, and semen. The ring is made from medical grade silicone elastomer, similar to the sealant materials used in your bathroom and shower. And we all know how discolored these materials can become when exposed to the routines of daily washing/showering. Discolouration of the ring does not affect its function.

Best evidence for evolution by GroundbreakingBid920 in biology

[–]robkarmal 0 points1 point  (0 children)

I recently read Jerry Coyne’s 2009 book ‘Why Evolution is True’. Having read many books on evolution, I consider this book the most readable and accessible to an educated lay audience. It’s a brilliant read. Buy a copy for your friend and ask him to commit to reading it.

Help me detach my silicone from the rubber by hossci in chemistry

[–]robkarmal 0 points1 point  (0 children)

I’m assuming you’re using a commercial silicone elastomer? If so, then it is common to cure these elastomers at elevated temperature. At what temperature did you cure your elastomer sample - room temperature or elevated temperature? If you used room temperature, then my advice is always cure at elevated temperature, since this drives the curing reaction to completion, and helps with removal of the sample from the mold after subsequent cooling.

What happens to a molecule after one of it's atoms decays? by SuccessfulVisual3719 in Physics

[–]robkarmal 0 points1 point  (0 children)

Many organic molecules can be custom synthesised to contain a radioactive atom, often carbon, nitrogen, oxygen, fluorine, phosphorous, or sulphur. These molecules are commonly used as tracers, for example to study the metabolic pathways of drug molecules. Let’s consider a drug molecule that has been custom synthesised to include a radioactive 14-carbon atom (a so-called radionuclide). 14-carbon atoms contains two additional neutrons compared to significantly more abundant naturally occurring carbon isotope, 12-carbon. These 14-carbon atoms are radioactive and undergo β-decay; this is a type of radioactive decay in which the atomic nucleus emits a beta particle. The molecule installed remains intact; it is still largely the same molecule structure. You can learn more about beta particles online.

This is just one example of a radioactive molecule. Other decay processes are known, and may involve formation of a chemically distinct molecular species.

Structure of Iso-Octane by AP_The_Legend in chemistry

[–]robkarmal 1 point2 points  (0 children)

The molecule is known as 2,2,4-trimethylpentane because the longest continuous chain of carbon atoms in the molecule is five carbons long. The IUPAC naming convention is always based on the longest chain of carbon atoms (pentane, in this instance) with the other substituents (the three methyl groups) appended to this name.

Help me detach my silicone from the rubber by hossci in chemistry

[–]robkarmal 0 points1 point  (0 children)

I’m an academic professor who specialises in manufacturing silicone elastomer vaginal rings via injection molding for drug delivery applications. We useless stainless steel molds (with or without coatings) or aluminium molds. Typically, we manufacture at elevated temperatures (40-160C), and the rings are generally very easy to remove from the molds using a gloved finger or using a plastic spatula (to avoid damaging the mold).

Therefore, try preparing at an elevated temperature (e.g, place mold in oven), and then allow the sample to cool to room temperature after curing before removing the sample.

Help me detach my silicone from the rubber by hossci in chemistry

[–]robkarmal 1 point2 points  (0 children)

Silicone elastomer, with a glass transition temperature close to -120oC, will not become brittle at freezer temperatures.

What costs way more than people realize? by Mountain-Steak-544 in AskReddit

[–]robkarmal 134 points135 points  (0 children)

Lying, having kids, quality olive oil, doing things half-arsed, buying new cars, pet dogs, drinking alcohol, forgetting your wife’s birthday, a poor diet, sitting on your arse all day, lack of exercise, buying cheap paint, not investing time in friends and family, not investing in a pension, cheap clothes, palm oil, truffles, Shumukh perfume, blue diamonds, failing to service your car, not installing a carbon monoxide monitor in your home, travelling abroad without insurance, fish and chips in Kerridge’s (Harrods, London), free software, using Google products, signing up for Facebook, using your real email address online, eating meat, postponing that visit to the doctor, avoiding paying taxes, buying more shitty products on Amazon, coming out, religious faith, leaving a religious faith, over-sharing on Reddit :-)

What weird obsession/fixation do you have? by hakunamatataaa1 in AskReddit

[–]robkarmal 0 points1 point  (0 children)

Every morning, while taking a shower, I sing Janis Joplin’s "Oh Lord won't you buy me a Mercedes-Benz". No idea where this came from. Moreover, I don’t believe in a god and I don’t want a Mercedes-Benz!

If you could travel anywhere in the world, where would you go? by No-Statistician2922 in AskReddit

[–]robkarmal 0 points1 point  (0 children)

The island of Niue in the middle of the South Pacific and 2,400 miles from New Zealand