Science desk | ||
---|---|---|
< July 19 | << Jun | July | Aug >> | July 21 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
I know hunter-gatherer societies would sometimes do persistence hunting, whereas in industrialized societies, humans can just buy meat at the grocery store. So, assume a very chubby human lives about 4-5 miles from the grocery store with a lot of traffic lights along the journey. The human is not accustomed to vigorous physical exercise but decides to stop driving to the grocery store. He uses his legs to run there as fast as possible. After running, I think the body will take about a day to rest and recover. If that human runs every other day, then he will likely build muscle. My question is, is counting calories really necessary? Why can't humans just work on building a lot of muscles and let the muscle raise the basal metabolic rate? 50.4.236.254 ( talk) 00:31, 20 July 2017 (UTC)
See this gif HERE. What is this death ray looking tool (more specifically)? What is meant by "nuclear decommissioning" Decommission of nuclear generators? Why must a laser cutting tool be used instead of say, a plasma cutter or any other type of cutting tools? 64.170.21.194 ( talk) 01:30, 20 July 2017 (UTC)
"As the nation's power stations reach the end of their working lives the problem of their demolition has prompted engineers to look at implementing novel techniques in many aspects of nuclear decommissioning.
Using one laser, configured in two different ways, TWI's team has shown that both tube cutting for size reduction and concrete scabbling for removal of contaminated surface layers can be conducted in a safe, remote and efficient manner.
In March 2009, the UK's Nuclear Decommissioning Authority awarded TWI a contract to develop prototype equipment for demonstrating the twin processes of concrete scabbling and tube cutting, and how these technologies might be implemented for remote use in nuclear decommissioning environments. The goal of the project was to allow Site Licence Companies and supply chain companies to evaluate the technology in terms of both process capability and operating costs, mindful that the underlying technical issues had already been addressed."
Is there any difference between a 61905-2Z bearing and a 6905-ZZ bearing? They appear to have the same dimensions, and some shops even advertise both models on the same page (though most don't). Are these two different designations for the same items? Or two mutually compatible items? Covfefe beans ( talk) 01:32, 20 July 2017 (UTC)
Are there things which can be made on a shaper but cannot as easily be made on a milling machine? 2601:646:8E01:7E0B:1AA:EC88:6F1A:C659 ( talk) 10:55, 20 July 2017 (UTC)
Circumstances led me to ask a question I cannot answer: Why do we have split forearms? [2]. A putative answer is that it is better for pronation and supination. Is it true? But at the same time it is a very ancient feature. It seems all vertebrates have them. A reptile skeleton shows the ulna and radius in a giant lizard [3]. A legend for the picture of some obscure dinosaur mentions both forelimb bones [4]. I don't think it helped them with pronation. What would happen if two bones of the forearm (ulna and radius) are replaced with one bone. It is important for me to find the answer. Thank you, -- AboutFace 22 ( talk) 16:44, 20 July 2017 (UTC)
Thank you much, but I still don't feel I have an answer. Deep down I hoped that somebody working in a med school anatomy would try to attach a flat bone to a skeleton instead of ulna and radius and see if it allows locomotion and what the limitation might be. I may try to do it virtually, there are programs but it will take a lot of time for sure. -- AboutFace 22 ( talk) 19:44, 20 July 2017 (UTC)
@CodeTalker, it was the part of the OP post: "What would happen if two bones of the forearm (ulna and radius) are replaced with one bone" Everything you say is contributing, although it is not the full answer yet. Perhaps it is impossible now to get the complete answer. Thanks, -- AboutFace 22 ( talk) 20:51, 20 July 2017 (UTC)
@SemanticMantis, are you saying that true pronation and supination require two forearm bones? -- AboutFace 22 ( talk) 20:54, 20 July 2017 (UTC)
It is all very interesting. Thank you very much. I think I am close to a solution. -- AboutFace 22 ( talk) 21:02, 20 July 2017 (UTC)
@Wnt, it is absolutely incredible, almost teleological in design. There is a way to download a virtual skeleton and I plan to do it and investigate the joints of the arm and hand closely. I need it for a project. I thought I could simplify the structure by replacing two forearm bones with one but it may not be possible without sacrificing some degrees of freedom. Thank you -- AboutFace 22 ( talk) 23:29, 20 July 2017 (UTC)
@SemanticMantis, I tried to understand if an artificial arm I may eventually design could function with one bone instead of two. That would have saved money and production time but I cannot sacrifice the function of the artificial hand and need to make the latter exactly matching the real hand. -- AboutFace 22 ( talk) 23:37, 20 July 2017 (UTC)
Again many thinks to @SemanticMantis, @Wnt and @Gem fr. Your contributions and musings are super important to me. @Wnt, especially wrote something that gave me shivers since this is what I am planning to do eventually: "...the positions of the fingers might work out exactly as you expect, and even an artificial skin conceivably could be made to match the motion of the biological." Unfortunately I cannot go into many details, some patents are still pending, but I feel I got everything I could hope for from this post. Thank you, - -- AboutFace 22 ( talk) 15:12, 21 July 2017 (UTC)
@Blooteuth, Yes, it may be useful. I am taking notice of it. I wonder if Latex 74 or another grade might be flexible enough in the dry state? Thanks, - -- AboutFace 22 ( talk) 15:06, 22 July 2017 (UTC)
I did not mention the legs because they are out of my interest and I did not want to distract attention from the main subject: radius an ulna. Thanks, - -- AboutFace 22 ( talk) 18:19, 23 July 2017 (UTC)
Science desk | ||
---|---|---|
< July 19 | << Jun | July | Aug >> | July 21 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
I know hunter-gatherer societies would sometimes do persistence hunting, whereas in industrialized societies, humans can just buy meat at the grocery store. So, assume a very chubby human lives about 4-5 miles from the grocery store with a lot of traffic lights along the journey. The human is not accustomed to vigorous physical exercise but decides to stop driving to the grocery store. He uses his legs to run there as fast as possible. After running, I think the body will take about a day to rest and recover. If that human runs every other day, then he will likely build muscle. My question is, is counting calories really necessary? Why can't humans just work on building a lot of muscles and let the muscle raise the basal metabolic rate? 50.4.236.254 ( talk) 00:31, 20 July 2017 (UTC)
See this gif HERE. What is this death ray looking tool (more specifically)? What is meant by "nuclear decommissioning" Decommission of nuclear generators? Why must a laser cutting tool be used instead of say, a plasma cutter or any other type of cutting tools? 64.170.21.194 ( talk) 01:30, 20 July 2017 (UTC)
"As the nation's power stations reach the end of their working lives the problem of their demolition has prompted engineers to look at implementing novel techniques in many aspects of nuclear decommissioning.
Using one laser, configured in two different ways, TWI's team has shown that both tube cutting for size reduction and concrete scabbling for removal of contaminated surface layers can be conducted in a safe, remote and efficient manner.
In March 2009, the UK's Nuclear Decommissioning Authority awarded TWI a contract to develop prototype equipment for demonstrating the twin processes of concrete scabbling and tube cutting, and how these technologies might be implemented for remote use in nuclear decommissioning environments. The goal of the project was to allow Site Licence Companies and supply chain companies to evaluate the technology in terms of both process capability and operating costs, mindful that the underlying technical issues had already been addressed."
Is there any difference between a 61905-2Z bearing and a 6905-ZZ bearing? They appear to have the same dimensions, and some shops even advertise both models on the same page (though most don't). Are these two different designations for the same items? Or two mutually compatible items? Covfefe beans ( talk) 01:32, 20 July 2017 (UTC)
Are there things which can be made on a shaper but cannot as easily be made on a milling machine? 2601:646:8E01:7E0B:1AA:EC88:6F1A:C659 ( talk) 10:55, 20 July 2017 (UTC)
Circumstances led me to ask a question I cannot answer: Why do we have split forearms? [2]. A putative answer is that it is better for pronation and supination. Is it true? But at the same time it is a very ancient feature. It seems all vertebrates have them. A reptile skeleton shows the ulna and radius in a giant lizard [3]. A legend for the picture of some obscure dinosaur mentions both forelimb bones [4]. I don't think it helped them with pronation. What would happen if two bones of the forearm (ulna and radius) are replaced with one bone. It is important for me to find the answer. Thank you, -- AboutFace 22 ( talk) 16:44, 20 July 2017 (UTC)
Thank you much, but I still don't feel I have an answer. Deep down I hoped that somebody working in a med school anatomy would try to attach a flat bone to a skeleton instead of ulna and radius and see if it allows locomotion and what the limitation might be. I may try to do it virtually, there are programs but it will take a lot of time for sure. -- AboutFace 22 ( talk) 19:44, 20 July 2017 (UTC)
@CodeTalker, it was the part of the OP post: "What would happen if two bones of the forearm (ulna and radius) are replaced with one bone" Everything you say is contributing, although it is not the full answer yet. Perhaps it is impossible now to get the complete answer. Thanks, -- AboutFace 22 ( talk) 20:51, 20 July 2017 (UTC)
@SemanticMantis, are you saying that true pronation and supination require two forearm bones? -- AboutFace 22 ( talk) 20:54, 20 July 2017 (UTC)
It is all very interesting. Thank you very much. I think I am close to a solution. -- AboutFace 22 ( talk) 21:02, 20 July 2017 (UTC)
@Wnt, it is absolutely incredible, almost teleological in design. There is a way to download a virtual skeleton and I plan to do it and investigate the joints of the arm and hand closely. I need it for a project. I thought I could simplify the structure by replacing two forearm bones with one but it may not be possible without sacrificing some degrees of freedom. Thank you -- AboutFace 22 ( talk) 23:29, 20 July 2017 (UTC)
@SemanticMantis, I tried to understand if an artificial arm I may eventually design could function with one bone instead of two. That would have saved money and production time but I cannot sacrifice the function of the artificial hand and need to make the latter exactly matching the real hand. -- AboutFace 22 ( talk) 23:37, 20 July 2017 (UTC)
Again many thinks to @SemanticMantis, @Wnt and @Gem fr. Your contributions and musings are super important to me. @Wnt, especially wrote something that gave me shivers since this is what I am planning to do eventually: "...the positions of the fingers might work out exactly as you expect, and even an artificial skin conceivably could be made to match the motion of the biological." Unfortunately I cannot go into many details, some patents are still pending, but I feel I got everything I could hope for from this post. Thank you, - -- AboutFace 22 ( talk) 15:12, 21 July 2017 (UTC)
@Blooteuth, Yes, it may be useful. I am taking notice of it. I wonder if Latex 74 or another grade might be flexible enough in the dry state? Thanks, - -- AboutFace 22 ( talk) 15:06, 22 July 2017 (UTC)
I did not mention the legs because they are out of my interest and I did not want to distract attention from the main subject: radius an ulna. Thanks, - -- AboutFace 22 ( talk) 18:19, 23 July 2017 (UTC)