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Sensei

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Everything posted by Sensei

  1. ..I bow before your eloquence..
  2. ..about lack of consistency in statements, mutually contradictory statements over the years, change of mind depending on who is asking the questions etc. etc. ... I have no idea what this has to do with the so-called "cancellation culture." OMG, are not you the same, toward the people who claim that the Earth is flat? You "cancel" them, and they "cancel" you.. Two groups, have no discussions etc. etc.
  3. No. Not exactly. Organisms that use photosynthesis to create food absorb photons in certain visible ranges and use them to break down CO2 and H2O molecules to produce the compounds they require. https://en.wikipedia.org/wiki/Autotroph Typically, energy flows from the source, which has a higher temperature, to the body, which has a lower temperature. The human body temperature is about 36.6 C, and the ambient temperature is typically lower, so we warm the environment. Green parts of the plants, which are designed to absorption of the photons (not green one range!), are absorbing photons, so they are not absorbed by something else. The absorbed photons (by whatever) are re-emitted at lower frequencies, such as infrared, and absorbed by something else, and the energy is retained on Earth. White rock reflects photons of visible light, while black rock absorbs photons of visible light. Some of them are re-emitted into space. In this way, the Earth can be seen in the range of infrared and other photons. Trees/plants absorb CO2 as they grow. CO2 absorbs photons. More CO2 in the atmosphere means more photons absorbed and more energy stored. They talk about CO2 because the more there is in the atmosphere, the more energy is stored on Earth, and the layman reads this as an increase in average temperature.
  4. I think this is a great exaggeration that has nothing to do with the content of your post.. Inevitable editorial and printing errors, or made intentionally by angry "pranksters" (typesetter). Don't you know a parcel courier who is kicking packages (especially those marked treat with care)? I see it daily.. Nothing novel. Politicians have been using religion to gain more political power for thousands of years. E.g. Caesar intercepted non dismissable position as pontifex maximus (i.e. equivalent of the Pope) by bribery..
  5. Hemodialysis (or blood transfusion) can indeed solve many problems if they are related to the presence of microorganisms, viruses or other (unwanted) chemical elements in the blood. But who said that autism is caused by a chemical imbalance in the blood? If it were so easy, it could be easily detected with blood analysis and resolved with drugs which fix the imbalance.
  6. To check whether two objects of any shape have collided, the programmer can treat them as spheres at the first stage, i.e. calculate the min-max bounding box from all points, calculate the center point and the maximum radius. Then, if the distance between two such spheres is greater than the sum of the radii, the objects are too far away to be bothered with. However, if the distance between them is smaller, a less optimal, slower algorithm is performed to check the objects nearby. Several levels of spheres are used in 3D games. One sphere to cover the entire body. A second set of smaller spheres for all parts of the body. These are checked similarly to the previous step, but instead of comparing triangles with triangles (or polygons with polygons), because they are very slow for the processor, still spheres vs spheres are checked. People use KD-Tree (3D), Octree (3D) or Quad-tree (2D) to optimize such work. https://en.wikipedia.org/wiki/K-d_tree https://en.wikipedia.org/wiki/Octree https://en.wikipedia.org/wiki/Quadtree i.e. objects that are close to each other are in the same leaf or in a neighboring leaf. If an object does not move between frames, it does not need to be removed from the leaf and added to a new one. With a fixed number of elements, you can use voxels ("volumetric pixels"). https://en.wikipedia.org/wiki/Voxel Remember that in animation up to a certain level, you can reuse calculations from the previous frame(s) in future frames.
  7. If you weren't in hot water writing this post, you would have read (or between the lines i.e. in good faith) that we were talking about the potential bombing of Tokyo.. so, I was not comparing Hiroshima vs Washington, but Tokyo vs Washington, i.e. destruction of capital city of 1st country vs destruction of capital city of 2nd country.. Which is quite obvious from my statement. Thus, the introduction of Hiroshima into this topic is out of place, as I was comparing destruction of two capitals..
  8. I like your proposal. Politicians are like children. Want to put on the ritz, show off in the sandbox.. It is irrelevant.. Nuclear fission was discovered by German-Nazi scientists in 1938. https://en.wikipedia.org/wiki/Discovery_of_nuclear_fission ..and this led to Einstein's proposal to create an American version of it, before Nazis.. This is patently untrue. Are you suggesting a large cost? Compare how much NASA spent, and how much SpaceX spent, on the same task. Would the Americans surrender if Washington was destroyed? https://en.wikipedia.org/wiki/Burning_of_Washington ..it could have been done anywhere and none of the living observers would have understood what actually happened.. This statement is silly..
  9. ..everyone here understands that your understanding of physics and chemistry is petty.. ..doesn't burn because there is no Oxygen. Rockets have Oxygen in their fuel tanks, so..
  10. Use a lighter and check again...
  11. To avoid spending the next 30 years with a home loan?
  12. ..at least you will have a chance to learn something unknown and have fun.. Plugging in a ready-made solution and voila it's no fun..
  13. Mechanical analog timer, such as: will be a PITA because you will have to rewind the wheel every time the previous cycle ends.... e.g. 48h The Arduino method will work as long as there is power (if there is no power, the plants also have no light anyway).
  14. You can purchase an Arduino module with RTC (real-time clock) or even an Arduino clone with built-in RTC or software emulated RTC. ESP8266 has built-in WiFi ($8 cost) https://forum.arduino.cc/t/setting-the-esp8266-internal-clock/680099 If you keep it online via WiFi, it can automatically update the time. The ESP8266 is much smaller than a typical Arduino and does not allow external expansion modules to be connected on top of it. For basic work you don't need them anyway. But there are cool extension modules with built-in SD/SDHC reader/writer with built-in RTC. This one will work with the ESP8266, because it is not a plug-in from above on the Arduino. Why you may need it? Writing logs, reading the program, when to turn on the lights or whatever you want to control. Reprogramming via SD/SDHC without touching the C/C++ Arduino source code. Arduino with WiFi can be accessed by web browser: https://www.google.com/search?q=set+up+http+server+arduino For example, instead of saving SD/SDHC or reprogramming, it can be done from the phone's web browser.
  15. It would be cheaper and more flexible to buy a $5 Arduino clone. e.g. https://www.ebay.com/itm/145160861832 and relay module for $1.5 e.g. https://www.ebay.com/itm/354746987710 You can then control any 110/230-volt electrical system and turn it on or off on demand using a hand-written C/C++ program that you put on the Arduino board. Sample code in the video below. It is very simple. An 8-channel relay for Arduino costs $6 here, so you can control up to 8 different electrical systems with different parameters. https://www.google.com/search?q=how+to+use+relay+arduino e.g.
  16. It is not about the problem. It's about getting a small amount of energy, as @Airbrush pointed out in his OP. A home office can save a huge amount of energy not wasted on travel. Free public transportation (instead of a flood of cars on streets) can save a huge amount of energy not wasted on fuel. If people use free public transportation, they don't have to buy new cars, spend money on maintenance, etc. All things that the oil, gas, energy and cars sectors (and their shareholders) will be very unhappy about. Employees will demand government intervention to maintain the status quo, etc.
  17. I appreciate the sense of humor. But you can get vitamin D from the UV radiation emitted by artificial lights indoors. BTW, imagine how much energy you save with a home office!
  18. https://en.wikipedia.org/wiki/Atomic_battery Atomic batteries (waste from nuclear power plants) are used in space travel. Very low capacity, but long life. "Atomic batteries usually have an efficiency of 0.1–5%. High-efficiency betavoltaic devices can reach 6–8% efficiency.[5]" Putting it in your pocket ("the size of a smartphone"), suggesting using it for everyday use is just silly..
  19. You participated in his first utility model (not patent) thread. It was pretty much the same as this one.
  20. ..there are even plants which you can cut a branch, put it in the water or soil, and it will sprouts roots.. I did it with e.g. chokeberry, gooseberry. If other plant will deliver the all required elements, it will work. It's all about nutrition. Experimentation.
  21. I use my smartphone to create my own Android application for it.. I have never installed any 3rd party application on any of my devices (built-in the system does not count). There is just dozen of mine.. Currently, none of my devices have a Google account logged in, so I can't even get into the Google Play Store. And it's fine. I just uploaded the new Friday app to the device.
  22. When a man buys a modern smartphone with a large size, such as 6.5 inches, needs to think about everything in advance, and buy a whole new set of clothes with large enough pockets. Girls have it easier, as they tend to carry a purse with them throughout the day.
  23. Resistance to certain microorganisms can be checked at the medical center.. i.e. blood test to measure antibodies. We have a saying "paper will accept anything" (it is even simpler if they are simply bits on a computer disk).. Doubtful. It is silly (premature) idea, since there is no even global ID card.. Do you have ID card in the U.S.? Man would first have to be unified before such an incentive would have any sense of existence.. ps. Antivaxxers have even created an entire industry producing fake vaccine certificates for COVID-19.. https://www.google.com/search?q=anti+vaxxers+captured+tourists
  24. I wouldn't bother with it. The dirtiest things you touch on daily basis without sterilization are paper money and door handles. If you wash your hands regularly, don't smoke, and don't put your hands in your mouth (child), you are relatively safe if you don't have severe immune system problems. One way is to use UV light. There are ready-made devices. There is also Sun.. https://en.wikipedia.org/wiki/Ultraviolet_germicidal_irradiation https://en.wikipedia.org/wiki/Germicidal_lamp I just found that local library has such device which also opens pages and use UV light on them.. https://www.google.com/search?q=sterilization+uv+light+books
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