Can electricity arc in a vacuum? |
- Can electricity arc in a vacuum?
- How is dirt/debris/inorganic material handled or processed when a caterpillar passes through the pupal stage (and digests itself)?
- Can a person with high blood pressure donates blood?
- Why do conventional spin echo MRI do not seems to have problem of signal saturation like gradient echo with large flip angle?
- How many years ago did insects emerge?
- How does the collapse of a magnetic field cause a voltage spike?
- If cells are often dying and being replaced (I often here you have an “entirely new body” every seven years) then why does damage from youth (alcohol, drugs, sun exposure) lead to health problems later in life?
- How widespread (or not) are songbird languages?
- Why did/do video and computer games need save points?
- Why do Acids Melt Stuff?
- How did humans of the past deal with wisdom teeth? Did they remove them without anaesthetics or did some people just suffer in pain?
- How do our brains conceptualize math at the neurological level? Do our neurons seem to act like little Turing machines? Or do they operate on some other model?
- Is acne as common on lesser primates as it is on humans?
- Where is the asteroid that creates extinction for dinosaurs?
- What changes the color of electricity?
- What is happening within my body/pores when I pop a pimple and it returns later? *resubmitted
- When they say that epithelium/parenchyma is the functional part of cells, what precisely do they mean by functional?
- When in tense or scary situations, why does the heart beat faster? Does increased blood flow make you more alert or capable?
| Can electricity arc in a vacuum? Posted: 27 Jul 2019 01:09 PM PDT |
| Posted: 27 Jul 2019 12:36 PM PDT Where I live (rural area) there are always lots of caterpillars seen near the fields and crossing roads this time of year. It is hot and the roads are oily and lots of tar/rock chip, etc. There have to be oil / tar / debris that sticks to the hairs of the caterpillars, and I was wondering how this stuff is accounted for when the caterpillar turns itself into soup inside the chrysalis. Do they shed an outer layer or dispatch of the hairs/fur before going through this process, to avoid complications? Could certain debris or chemicals cause issues during this transitional phase? [link] [comments]  |
| Can a person with high blood pressure donates blood? Posted: 28 Jul 2019 08:02 AM PDT Let's say his/her blood pressure was high but still donates blood anyway. What would happen to him/her? [link] [comments]  |
| Posted: 27 Jul 2019 09:00 PM PDT Hello, I am a radiographer and was taking a course in MRI medical imaging. According to the lecturer, the gradient echo sequence was designed to have a short repetition time (TR) to reduce scan time. However, with short TR, there will be signal saturation for each scan cycle due to the low recovery of longitudinal magnetization after each scan cycle. The solution is to use a small flip angle to compensate for the signal saturation. Then, there is a problem that confused me. If what he said was true, then when we do a conventional spin-echo sequence (use 180 degrees RF pulse for echo). Why the signal saturation is not a problem? I asked this question to my lecturer. He answered that "that's why we should not use too short TR even in conventional spin-echo sequence" I thought of an example. By definition, T1 relaxation time is the time required for the z-component of M to reach (1 − 1/e) or about 63% of its maximum value (Mo). Let's say I want to do a T1 weighted scan for a muscle with a typical TR time of 800msec. The T1 relaxation time of a muscle is around 900msec. According to the T1 relaxation equation. after each cycle, the longitudinal magnetization will be recovered to 58.9% of its original value. According to this calculation, then, after 10cycle, there will be only 0.5% of magnetization remains? If using 256 phase encoding level. There should be no signal left at the end of the scan? I know there must be a mistake in my thinking. Because it contradicts the real life situation. What mistake did I make here? [link] [comments]  |
| How many years ago did insects emerge? Posted: 27 Jul 2019 12:26 PM PDT Since insects has no bones and fossils, does anybody know which age probably did insects emerge? [link] [comments]  |
| How does the collapse of a magnetic field cause a voltage spike? Posted: 27 Jul 2019 12:47 PM PDT In ignition coils in the automotive world, a large surge of voltage is needed to jump the air gap of a spark plug. the primary coil receives 12 vols and generates a magnetic field, that field directly effects the secondary coil in this case to step up the voltage, and i feel like i understand that much. My question is what is special about the collapse that allows for a surge large enough to jump the air gap, or is it simply because the stored voltage in the secondary coil is finding the quickest path to ground. i am also not sure which flair is best here... [link] [comments]  |
| Posted: 27 Jul 2019 06:06 AM PDT |
| How widespread (or not) are songbird languages? Posted: 27 Jul 2019 05:33 AM PDT Can different species understand each other? If so, can introduced species communicate with native ones? I've asked this before, but that category didn't work out. Google only gets me stuff about birds speaking English. Is this something no one knows? [link] [comments]  |
| Why did/do video and computer games need save points? Posted: 27 Jul 2019 11:57 AM PDT Playing a rerelease of an old game, and it struck me how strange it is to have to go to a specific save point to save my game data. Some modern games also have this feature, though most (in my experience) autosave or let you save whenever, so I assume this is just for nostalgia/familiarity in these games rather than by necessity. Could anyone explain why save points like that were necessary? What's going on behind the scenes that makes that location be the only one saving data can occur? [link] [comments]  |
| Posted: 27 Jul 2019 02:14 AM PDT Obviously, they don't annihilate the very atoms of a substance they come into contact with, but why do acids actually melt stuff? [link] [comments]  |
| Posted: 26 Jul 2019 10:14 PM PDT |
| Posted: 26 Jul 2019 07:46 PM PDT |
| Is acne as common on lesser primates as it is on humans? Posted: 27 Jul 2019 12:53 AM PDT |
| Where is the asteroid that creates extinction for dinosaurs? Posted: 27 Jul 2019 03:18 AM PDT |
| What changes the color of electricity? Posted: 27 Jul 2019 02:11 AM PDT I've seen footage of lightning striking ground, and the flashes are often a pale orange. As an industrial battery technician, I've seen plenty of arcs and they are almost always blue. Lightning in the clouds looks white. I've seen high voltage line arcs that are bright turquoise. Which is the same color as the corrosion produced by sulfuric acid on copper. Arc flashes are often yellow. [link] [comments]  |
| What is happening within my body/pores when I pop a pimple and it returns later? *resubmitted Posted: 26 Jul 2019 11:32 PM PDT I'm curious about what exactly goes on in this situation; especially since the time gap between the initial pop and the return of the whitehead can range (anecdotally) from an hour to a day, and sometimes returns more than once in the same day. [link] [comments]  |
| Posted: 27 Jul 2019 02:50 AM PDT The epithelium covers outer organ and inner part of cavities, but what about that is functional? [link] [comments]  |
| Posted: 26 Jul 2019 08:21 PM PDT The hormone adrenaline causes the increase in heart rate, but why? [link] [comments]  |
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