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Showing content with the highest reputation on 04/23/21 in all areas

  1. Before I do, I want to make clear: I do not think of any of this as disqualifying, or even that important. I think of Nancy Pelosi as, for the most part, a pretty typical politician; I think that nearly every politician at her level has similar hypocrisies. For a recent example (that is on-topic): Pelosi's response to Maxine Waters's statement that protesters should get "more confrontational". Maxine Waters said "[...] and we've got to get more active, we've got to get more confrontational, we've got to make sure that they know that we mean business" in response to a question of what protesters should do if the Chauvin verdict wasn't 3 guilties (manslaughter, murder 3, murder 2 - though she may have only heard "what should protesters do?" without the specific circumstances). The phrase "more confrontational" got pushback, which led Pelosi to say "No, Maxine talked about confrontation in the manner of the civil rights movement." I don't think that she can believe this is as simple as that, given her support for the impeachment of Trump for the riot at the capitol. She appropriately noted there that even if Trump said to protest peacefully, that the context easily allowed people to interpret it as support for intimidation. The same is true, if on a much smaller scale (and with less direct import), for Waters's comment. Now, I agree that this is arguable, and not only that, but that there are many, many worse cases. But there is reason to dislike her beyond "liberal".
    2 points
  2. What are you talking about ? Grumman, even after aquisition and merger with Northrop, has never produced aero engines. It is a totally different area of expertise, and best left to the GE, P&W, RR, Safran, Honeywell, etc. You certainly can't mean the main engines of the F-14, as the main contractor for the propulsion systems was Pratt and Whitney, with the TF-30 for the A model, which would have been superseded by the F-401 in the definitive B model. It was only some 20 years later that the F-14 D model got some advanced technology general Electric engines in the way of the F110-GE-400. Are you maybe talking about the APU ? Maybe, instead of relating stories, and dropping names as to how you personally knew Roy Grumman, you could try to be more clear as to what you are talking about, and post some evidence for your assertions.
    2 points
  3. I am well famliar with the history of the Grumman F-14 tomcat and how it arose from the stillborn General Dynamics F-111B ( TFX for the Navy ). Magnetic bearings may have been tried for the various pumps, fuel, lubrication, A/C, etc., but they were most certainly not used for any hot cycle propulsion bearings, so I really don't see how 'switching to battery' would deny anyone a firing solution. The F-14 and its fire control radar use the Phoenix missile, a fully active radar homing missile, capable of beyond visual range use in fire-and-forget mode. Other missiles that may have been used, would be the Sparrow, a semi-active radar homng missile which needs the launch aircraft to 'illuminate' the target at least part of the way before its own radar takes over in the terminal phase, and the Sidewinder, an infrared seeker missile with no radar, that homes in on the hot engine efflux of the target. Anyone who claims magnetic pump bearings can defeat those types of missile homing systems, makes me reach for the shovel, as it is a load of crap.
    2 points
  4. A woman was at her hairdresser’s getting her hair styled for a trip to Rome with her husband.. She mentioned the trip to the hairdresser, who responded: ” Rome? Why would anyone want to go there? It’s crowded and dirty.. You’re crazy to go to Rome .. So, how are you getting there?” “We’re taking BA,” was the reply. “We got a great rate!” “BA?” exclaimed the hairdresser.. ” That’s a terrible airline. Their planes are old, their flight attendants are ugly, and they’re always late. So, where are you staying in Rome ?” “We’ll be at this exclusive little place over on Rome ‘s Tiber River called Teste.” “Don’t go any further. I know that place. Everybody thinks it’s gonna be something special and exclusive, but it’s really a dump.” “We’re going to go to see the Vatican and maybe get to see the Pope.” “That’s rich,” laughed the hairdresser. You and a million other people trying to see him. He’ll look the size of an ant. Boy, good luck on this lousy trip of yours. You’re going to need it…” A month later, the woman again came in for a hairdo. The hairdresser asked her about her trip to Rome “It was wonderful,” explained the woman, “not only were we on time in one of BA’s brand new planes, but it was overbooked, and they bumped us up to first class. The food and wine were wonderful, and I had a handsome 28-year-old steward who waited on me hand and foot. And the hotel was great! They’d just finished a £5 million remodelling job, and now it’s a jewel, the finest hotel in the city. They too were overbooked, so they apologized and gave us their owner’s suite at no extra charge!” “Well,” muttered the hairdresser, “that’s all well and good, but I bet you didn’t get to see the Pope.” “Actually, we were quite lucky, because as we toured the Vatican, a Swiss Guard tapped me on the shoulder, and explained that the Pope likes to meet some of the visitors, and if I’d be so kind as to step into his private room and wait, the Pope would personally greet me. Sure enough, five minutes later, the Pope walked through the door and shook my hand! I knelt down and he spoke a few words to me” “Oh, really! What’d he say ?” He said: “Who the Fuck did your hair?”
    1 point
  5. https://phys.org/news/2021-04-astronomers-hint-silhouette-spaghettified-star.html Astronomers see first hint of the silhouette of a spaghettified star: For decades astronomers have been spotting bursts of electromagnetic radiation coming from black holes. They assumed those are the result of stars being torn apart, but they have never seen the silhouette of the actual material ligaments. Now a group of astronomers, including lead author Giacomo Cannizzaro and Peter Jonker from SRON Netherlands Institute for Space Research/Radboud University, has for the first time observed spectral absorption lines caused by strands of a spaghettified star. Publication in Monthly Notices of the Royal Astronomical Society. more at link.............. the paper: https://academic.oup.com/mnras/article-abstract/504/1/792/6185055?redirectedFrom=fulltext Accretion disc cooling and narrow absorption lines in the tidal disruption event AT 2019dsg: ABSTRACT: We present the results of a large multiwavelength follow-up campaign of the tidal disruption event (TDE) AT 2019dsg, focusing on low to high resolution optical spectroscopy, X-ray, and radio observations. The galaxy hosts a super massive black hole of mass (5.4±3.2)×106M⊙(5.4±3.2)×106M⊙ and careful analysis finds no evidence for the presence of an active galactic nucleus, instead the TDE host galaxy shows narrow optical emission lines that likely arise from star formation activity. The transient is luminous in the X-rays, radio, UV, and optical. The X-ray emission becomes undetected after ∼100 d, and the radio luminosity density starts to decay at frequencies above 5.4 GHz by ∼160 d. Optical emission line signatures of the TDE are present up to ∼200 d after the light-curve peak. The medium to high resolution spectra show traces of absorption lines that we propose originate in the self-gravitating debris streams. At late times, after ∼200 d, narrow Fe lines appear in the spectra. The TDE was previously classified as N-strong, but after careful subtraction of the host galaxy’s stellar contribution, we find no evidence for these N lines in the TDE spectrum, even though O Bowen lines are detected. The observed properties of the X-ray emission are fully consistent with the detection of the inner regions of a cooling accretion disc. The optical and radio properties are consistent with this central engine seen at a low inclination (i.e. seen from the poles)
    1 point
  6. I would have to agree. Incitement is always dependant on the incited, and has little to do with the well-meaning ( or lack thereof ) of the inciting statement. Politicians should know their audience, and how they'll react to their statements. I have gotten a little tired of N Pelosi, mostly because its been years since she last blinked ( her eyelids, actually her whole face, are stretched so tight 😄 ). I'm also tired of the games. The two eaders ( house and senate, when under different control ) always did things, not for the good of the country, but to make the other guys look bad. That kind of political tit-for-tat should stop, and Americans should demand that their government work for them, and not try to score points against the opposition.
    1 point
  7. Who is the "we" you refer to? Certainly not most cosmologists. While many/some cosmologists accept the possibility that the universe may have arisen from nothing, that "nothing" is not the "nothing" of the laypersons vocabulary. Moreover, very few insist that this must have occurred. If the "we" is anybody other than bona fide cosmologists their opinions may reasonably be dismissed.
    1 point
  8. Antimony density as a solid: 6.697 g/cm^3. As a liquid: 6.53 g/cm^3. Another way of expressing this is that 1g would have a volume of 0.15314 cc as a liquid, and 0.149320 cc as a solid. Since the mass would remain the same while going from liquid to solid, it would take up less volume after doing so. Bismuth, as a solid has a density of 9.78g/cm^3 as a solid, and 10.05g/cm^3 as a liquid. It's density goes down going from liquid to solid, and this its volume per unit mass goes up.
    1 point
  9. The first point is that all these elements are present in the form of compounds, in which their atoms are chemically bound to other atoms, whether by ionic or covalent bonding. The boiling point of oxygen (O2) is therefore not relevant, since free molecular oxygen is not what is being referred to. As @studiot says, oxygen is mostly present in magma as various kinds of silicate. The chemistry of silicates is very complex, but is all based around variants of the tetrahedral SiO4 unit, sometimes free but more often joined to others by shared vertices, to form chains, sheets or 3D arrays. These units are covalently bonded but tend to have a net -ve charge, thereby forming a family of silicate anions (SiO4⁴⁻, Si2O7⁶⁻, and so on) that can complement the metals you list, since they will be present in the form of cations. (You may be familiar with other complex anions such as carbonate CaCO3²⁻, sulphate SO4²⁻ etc, which also have covalent bonding internally but a net -ve charge overall. Silicates are like that.) However it is worth noting that pure silica itself, SiO4, in which SiO4 units form a 3D array, has no ions. When this melts, it requires some of the covalent bonds to break, temporarily, and reform, allowing the units to slide past one another. You get silica in most magmas, along with various silicates.
    1 point
  10. Good question, keep them coming. +1 First it is worth noting that rocks in general are not molten at the depths concerned and that rocks are made of minerals which are ionic crystals when solid. When these rocks melt they are called magmas. They melt for two reasons, heat and pressure release. Heat is generated as rocks are drawn downwards from above (subduction) or simply buried by earth movements and also rises from yet deeper layers. This rising heat is not evenly distributed but concentrates in vertical convection cells (plumes). However the deeper the rocks are the greater the pressure on them and so they cannot necessarily melt (turn into a liquid and flow) even if the temperature is above their melting point. The extra heat from below is one way to generate the molten state that is magma, and why volcanoes etc occur in some locations and not others. When such rock is moved upwards by earth movements the pressure is lowered or released and more rock melts to magma. When the melt occurs cations (+ve) and anions (-ve) are formed. Oxygen is often combined with elements such as silicon to form complex anions (SiO4)- which are stable at such temperatures and pressures. Water is also available and involved. Britannica has a good not too technical description. Note the opening statement. https://www.britannica.com/science/igneous-rock/Nature-of-magmas Does this help ?
    1 point
  11. A man boarded an airplane and took his seat. As he settled in, he glanced Up and saw the most beautiful woman boarding the plane. He soon realized She was heading straight towards his seat. As fate would have it, she took The seat right beside his. Eager to strike up a conversation he blurted out, “Business trip or pleasure?” She turned, smiled and said, “Business. I’m going to the Annual Nymphomaniacs of America Convention in Boston." He swallowed hard. Here was the most gorgeous woman he had ever seen Sitting next to him, and she was going to a meeting of nymphomaniacs! Struggling to maintain his composure, he calmly asked, “What’s your Business at this convention?” “Lecturer,” she responded. “I use information that I have learned from my Personal experiences to debunk some of the popular myths about sexuality.” “Really?” he said. “And what kind of myths are there?” “Well,” she explained, “one popular myth is that African-American men are The most well-endowed of all men, when in fact it is the Native American Indian who is most likely to possess that trait. Another popular myth is That Frenchmen are the best lovers, when actually it is men of Mexican Descent who are the best. I have also discovered that the lover with Absolutely the best stamina is the Southern Redneck.” Suddenly the woman became a little uncomfortable and blushed.. “I’m Sorry,” she said, “I shouldn't really be discussing all of this with you. I don’t Even know your name.” “Tonto,” the man said, “Tonto Gonzales, but my friends call me Bubba".
    1 point
  12. For this purpose, submarines with cruise and ballistic missiles are more suitable. They have an advantage over aircraft carriers and battleships, which is the ability to covertly go to a given area on the line of attack. From the point of view of the strictness of the terminology, we should say "semi-ballistic". The head of such a missile must be able to maneuver and be homing on radiation from the aircraft carrier's electronic equipment. According to this scheme, it is possible to make a long-range surface-to-air missile against flying AWACS radars.
    1 point
  13. Im sorry, you didnt achieve your goal. That must suck. Gosh, I guess all those dinosuars just couldnt adjust fast enough to the changes that the asteroid brought to the earth that killed them. We all know that can happen, besides you, apparently. See. when the asteroid changed the earth's climate, the earth needed to retain its climate, or the dinosaurs would die. It could not, so they died. Anyone want to argue that reality or the way I expressed it? Step right up folks, This thread is now about proving if dinosaurs died, because the earth failed to meet the needs of biological life, due to an asteroid impact.
    -1 points
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