Plants Definition and 190 Threads

Hello guys, I have been wracking my little brain with this one. Why do fruit trees generally prefer a more acidic soil than vegetable plants. Veg plants like 6-7ph (except potatoes - why again !) Fruit around 5-6pH. Thanks in advance :)

There are a lot of nuclear power plants around the world that have smoke stacks, the kind you'd usually see at a coal fired power plant. Are they to release steam in an emergency, or are they some kind of exhaust system the plant uses, or something else? Most nuclear power plants in America have...

I watched that documentary by Dr. Brian Cox about nuclear fusion development and in one segment Dr. Saul Griffith tries to calculate how much would World need renewable power sources like wind farms, solar panels, hydroelectric generators etc. to substitute oil use completely in like 20 years...

I was reading my textbook, Power Generation, Operation, and Control, third edition, and was thinking of the possibility of supplying peak load using a nuclear fission reactor. The reasoning behind my interest is that to supply the grid with nuclear energy at anywhere near 100% from nuclear you...

I'm new to this forum, and would just like to say this is a very impressive site. My question is what is the best path way in school to design heat exchangers for power plants (more geared towards nuclear power plants.) I'm currently finishing my first year of school studying mechanical...

Hello everyone, Just posting this because I was wondering if it's possible to build 5-10km deep closed loop geothermal power plants from microgrid sizes of 1-5MWe to commercial power plant sizes of 0.5-1GWe that can have construction costs in the $3,000,000 per MWe range (similar to solar and...

What is the name of this cactus i have?

In process plants many heating applications will use steam at approx 120 C whereas the standard cooling utility is cooling water at approx. 30 C. In the dozens of plants I've seen I cannot recall having seen even one Heat Pump. Why is this so? Is the capex too high? Or are compressors too...

“Plants are usually charged negatively and emit weak electric fields. On their side, bees acquire a positive charge as they fly through the air. No spark is produced as a charged bee approaches a charged flower, but a small electric force builds up that can potentially convey information. The...

The Venus Flytrap, like most carnivorous plants, meets its nitrogen requirements by trapping insects and digesting them. What will happen if this plant grows in nitrogenous soil? Will it even grow in such soil? If it grows will it stop trapping insects? Thank you

We know that a steam power plant is basically a heat engine with steam as the working fluid. According to the second law of thermodynamics a heat engine must operate between two thermal energy reservoirs one at a higher temperature(source) than the other(sink) to produce net work in a...

Hello I tried to look for the answer but didn't find enough one for being satisfied How excitation happens in big generators? If we produce electricity from electromagnet on the rotor, and electromagnets need electricity to be activated... and this happens by excitater on same rotor! and this...

Hey Guys, I was wondering in Sewage treatment plants ,how are detergents (Bleach and such )generally dealt with ,especially if the treated output is expected to be used in agricultural applications and such . Thank You

Fruit growers sometimes protect their crops by spraying them with water when overnight temperatures are expected to drop below freezing. Some fruit crops, like the strawberries in the figure, can withstand temperatures down to freezing (0° C), but not below freezing. When water is sprayed on...

Can't find a clear answer online. I have some carnivorous plants that I feed distilled water, which I always run out off so it's a bit of an inconvenience. I can't collect rain water, so I was thinking about using the water from my condensor tumble drier. Has anyone used that type of water...

Since plants contain proteins that help them identify gravity in order to grow the right way, and they also contain phytochromes that recongize photons, could a possible relationship between phytochromes and the gravity receptors within plants indicate that the gravity sensors are actually...

I have a list of various organic components I would like to extract from different fruits, vegetables, and plants and get the organic chains as pure as possible. How is that achieved? What science provides insight on the subject? I actually say science, but I'm looking for specific titles...

What in general prevents plants from rotting while they are alive? Do plants that go dormant in the winter need to spend energy to maintain a defense, say a flower bulb? Thanks for any help!

My mother has a plant that she forgot the name of. Does anyone know anything about it? (or a good place to find info about it)

I'm curious as to how much of a factor the lack of a sensible way of dealing with the radioactive waste is in regards whether to build a nuclear plant? I mean, the closest that we recently had for an option was the Yucca disposal site until work was stopped. Granted, it wasn't a perfect plan...

Experience teaches plants to learn faster and forget slower in environments where it matters Gagliano, M, et al. (2013). Experience teaches plants to learn faster and forget slower in environments where it matters. Oecologia, Epub.

i wish to know why have plants with exactly required medicinal value has evolved. is there a some sort of lock and key like reason which helps to evolve medicinal plants for many disease? i also want to the logic behind using water and other solvent for extraction of solvents. some time...

If we put a system that functions like the hydroelectric power plants do ( the gravity produces the movement of the water, producing electricity ) in vacuum and we put and object ( of a considerable mass ) that causes gravity and makes the "water" to orbit around it, wouldn't be a source of...

Anyone know an equation for comparing water absorption by plotted plants vs. evaporation of the water collecting in the pot's water collector? That is, if I water a plant and much of the water leaks through to the collection area how much of that leaked water will evaporate vs. be absorbed by...

I looked into the field of chemical engineering because of my interests in chemistry and making things, but I saw only things that involved power plant. Do chemical engineers do anything besides building, maintaining and supervising power plants? Thanks.

Part 1 can be found here: https://www.physicsforums.com/showthread.php?t=480200 Magnitude-5.3 earthquake hits Japan's Fukushima http://www.usatoday.com/story/news/world/2013/09/19/japan-fukushima-nuclear-plant/2835493/

Do nuclear plants shut down during a tornado warning? I have heard that they do but really can't think why.

Dynamos & Power Plants -- Question Please Read! I know that cars need batteries to generate electricity to the dynamo to make the dynamo produce electricity continuously without stopping unless you switched off the car. The same to motorcycles. But I don't know whether the power plants do the...

Why do frequent water changes cause aquatic plants to grow faster? In an aquarium, the more frequent the water changes the faster flora grow. But why is that?

hello all I want to find costs of some components of a combined cycle power plants.like turbine.generator and ... how can I find them?

Homework Statement Suggest a hypothesis to explain why algal and plant cells have cell walls. Suppose that mutant individuals from each group lacked a cell wall. How could you use these individuals to test your hypothesis? Homework Equations There aren't really... The Attempt at...

Why no desalination plants ? Many parts of the world face water crisis today ( especially Africa ) . This can be avoided if the sea water ( which is saline ) is made useful by desalinating it. many desalination techniques have been developed but why is not desalination applied on large...

Hello! I'm looking for a book, a website or a person that could clearly explain the basics and the differences between post-transcriptional gene silencing (PTGS) and virus-induced gene silencing (VIGS) in plants. All the articles I've found this far have been very confusing (or maybe it's...

Are there any nuclear power plants on oceanic coastlines like Fukashima Daiichi which are vulnerable to being damaged by powerful tsunamis and earthquakes? Do any of these coastal plants exist in the United States?

Homework Statement It has been argued that power plants should make use of off-peak hours (such as late at night) to generate mechanical energy and store it until it is needed during peak load times, such as the middle of the day. One suggestion has been to store the energy in large flywheels...

I know that some peanut doesn't have oil separation, but this is due to emulsifier chemicals that are added. I'm wondering what causes the oil to be released. I assume the storage structure is ruptured, and the oil molecules are consequently released. What exactly is a peanut? It's not a...

I came across this in a magazine and I'm skeptical about it. Does anyone have any evidence to support this or a link to the "studies' it references? Per attachment: "We know that plants utilize biochemical signaling molecules to communicate, especially when a predator is nearby. But...

I just want to ask a simple question to experts here. Can superheating of steam increases efficiency and output of thermal power plants?

Per wikipedia's article on wilting: http://en.wikipedia.org/wiki/Wilting :confused: Edited the article. The article before the revision can be found here: http://en.wikipedia.org/w/index.php?title=Wilting&oldid=497326200

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Just some extra info. These were all picked today. They were picked from the South West Ireland.

http://www.yomiuri.co.jp/dy/national/T120209007089.htm "Fukushima No. 2 plant was 'near meltdown'" http://ex-skf.blogspot.com/2012/01/japanese-expert-says-fukushima-ii-not-i.html "Just In: Japanese Expert Says Fukushima II (not I) Nuke Plant's Containment Vessel Has Been Damaged by the Quake"

Why can`t coal be the fuel for combined cycle power plants? Why is the succession of Brayton cycle and the Rankine cycle the most common design solution? Why using two Brayton cycles in series, using the lower temperature heat to drive a second gas turbine be a bad idea? Why would efficiency...

The pattern could be at an arterial, arteriole or capillary level. There are plenty of examples of branched patterns in organisms. [SIZE="1"](C) Baccar et al, Difficulté du diagnostic étiologique d’un poumon clair unilatéral, La tunisie Medicale - 2011 ; Vol 89 ( n°06 ) : 578-579 But...

I know the seeds are mildly poisonous, but what about the leaves? What about the leaves of other trees like, orange trees, plum trees, maple trees, ground banana tree leaves, etc? If the bark of a tree is edible, does that imply that it's leaves, seeds, and sap are edible as well? Vice versa...

Hello everyone, it's been a while since I posted here! Unfortunately, I've been away from the nuclear engineering scene and detoured to computer science. My job now is as a programmer for avionics. I enjoy it, but it isn't my first love. Recently, though, I got invited by my uncle to help out...

I found a recent article suggesting that solar storms predicted in in the next few years pose a serious threat to the electrical grid and thus to nuclear plant cooling systems: "Severe Solar Storms Could Disrupt Earth This Decade: NOAA," International Business Times...

Surely black would be better.

Seems odd there is a big hole in the spectrum between where they absorb red and blue light?

Killing bamboo plants with electricity?? This might be a crazy idea but I'm wondering if it's possible to kill bamboo roots with electricity. I have a bamboo bush that I pulled but the remaining roots will sprout new plants. Bamboo plants are hard to kill. Would I be able to kill the roots...