Storage Definition and 248 Threads

Hi, Who could evaluate my conception of heat storage with Na2-SO4? Idea: Dry Na2-SO4 is moistered with water till max energy release (solvation energy?) Has there been now Na2-SO4-10H20 produced? Can this compound be regenerated (dried) with heat supply (sun radiation?) to dry Na2-SO4...

Homework Statement Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 2.0 m diameter and a mass of 270 kg. Its maximum angular velocity...

Hello, I think i heard somewhere that a multidimensional array in fortran 90 may be stored non-contiguously in memory. Is this true? Even if it the size was known at compile time? If your answer is it depends on a compiler, what about ifort and gfortran?

this is from Nick Lane's Oxygen book I didn't quite understand this paragraph regarding the sudden release of a large amount of oxygen from cyanobacteria following the ice ages i don't understand how it's better to bury it. surely reacting with organic matter would be better as it is...

Hi, I am thinking of a device, i don't know if a similar one exists already but this is what it is supposed to do. 1. compress(or extend) a spring by way of some mechanical force like turning a wheel(this wheel could very well be that of a bicyle) 2. Once the spring is compressed(or...

I posted this on another section, but got no replies in three days...so thought maybe I'd had posted in the wrong section...apologies. I have an idea pertaining to energy storage in flywheels, something like they do in the KERS, and need assistance here... Ok, my idea involves using a...

I have an idea pertaining to energy storage in flywheels, something like they do in the KERS, and need assistance here... Ok, my idea involves using a flywheel of around 10 kg (steel) with I~1 kg.m^2, to be charged to an RPM of around 7,000 RPM. This allows E = 0.5 x 1 x (7000x2x pi /60)^2...

There exist such interesting issue as intercalation, which seems to allow, for example, to store 4.4 intercalated Li ions per one (!) Silicon atom.The latest is a host material.I think if there will be found a material which would allow to store the same ratio of intercalated hydrogen ions...

I know there exist methods to store a microwave in a vacuum superconducting or dielectric chamber.From first sight it looks as promising energy storage device,more safe then a flywheel.Even if chamber will be broken microwave will just left and fly into space. Unfortunately,I was not able to...

system? I know that it isn't possible in Windows since Windows has the registry and background variables that aren't stored on the file system for some reason. But what about Linux? Are its environment variables stored on the file system? Is there anything that isn't stored on the file...

Homework Statement Two identical capacitors that have been discharged are connected in series across the terminals of a 100V battery. When only on of the capacitors is connected across the terminals of the battery, the energy stored is U. what is the total energy stored in the two capacitors...

So, these things are baffling my mind. I understand they are a good storage of kinetic energy, and help keep momentum of motion. What I cannot get my head around is, how are they started say within a car, also I assume once the engine is turning over, why is the flywheel needed, so what is...

Hello All, I am trying to learn matrix compression algorithms for sparse matrices. I understand the Compressed Row Storage (CRS) format but I am having difficulty with the Block Compressed Row Storage (BCRS) format - where the size of the sub-block(s) are 2x2. Can anyone please point me to...

Hi! I'm trying to write a program, to show the vector field of a linear simple wave in shallow water. First, determining the position of a particle i run into a problem when trying to store the data in a vector/array. The equation for this is given below. In this particular case everything is...

Just a short concept question for understanding... I understand that a capacitor stores a charge, However I'm told that capacitors can be used to store up a charge and release it very quickly. How does this energy get released is what I don't understand. To my understanding of a...

Hi, if something exists, it must be stored somewhere. a program is stored in a hardware, our thoughts are stored in our brains, our bodies are stored in the universe. the universe exists, so it has to be stored somewhere. so a storage of universe exists - and it has to be stored somewhere...

Homework Statement You are an intern at an engineering company that makes capacitors used for energy storage in pulsed lasers. Your manager asks your team to construct a parallel-plate, air-gap capacitor that will store 120 kJ of energy. (a) What minimum volume is required between the...

Homework Statement A water hose is used to fill a large cylindrical storage tank of diameter D and height 2D. The hose shoots water at 45 degrees above the horizontal from the same level as the base of the tank and is at a distance 6D away. For what range of launch speeds will the water enter...

I have been doing some reading on super critical fluids. They are pretty amazing things. I can't help but wonder if there is a way to use the it for energy storage. Quite a few listed on wiki are critical at close to ambient temps. and the pressures are very easily attainable...

I hope this post goes here, if not I apologize, admin's feel free to move it if needed. I need a place to store files listed in the title above where I can get link(s) for posting to forums, share with friends, etc... I use tinypic for posting pictures, and that works fine, but I need a...

Prodution and storage of antimatter seems to be a hard task. The latter is of course because antimatter is annihilated when it makes contact with regular matter. Still, wouldn't it be possible to create \overline{^3He}^- ions and store these in a metal container which has a lot of negative...

I’m looking for an information source on the energy storage density of coiled springs made of various materials. Of particular interest are steel, titanium, carbon fiber, and carbon nanotubes.

What is the most powerful battery or way to store energy? I have an idea but I wanted to see what you guys would say :)

Lately I have seen a lot of people switching over to solar panels, they have basically 2 choices of what to do with the extra energy as far as I know. 1- Batteries 2- Return the extra power to the grid for a credit on their power bill It got me to thinking and I need some input as to...

Homework Statement This question isn't that hard just confusing: Write a program to compute the per-minute storage requirements for “full HD” TV at 60 HZ (60 frames per second) where each frame is captured at a resolution of 1920×1080 pixels using 24-bit color. Homework Equations 1 pixel...

Hi All, I want to create a website which only I can access, so that I can stor my files on. When I upload my files, and click on them, they automatically open (for example, a music file loads in quicktime through firefox and plays). I want it so that it offers me to download the file, not...

I mean to ask is every Energy storage or production associated with mass change?

Hi all! It's my first post. :cool: How is electrical energy sent into a superconducting loop for storage and taken out for use? Is there power loss during these actions? Peace!

Can anyone explain how to relate the bunch length and energy spread of a bunch in an electron storage ring to the longitudinal emittance? Also, if you know of a good reference I could use to look up more information I would really appreciate it. Thanks!

I'm working on a research project involving calculations about various aspects of electron storage rings and have come across the term energy acceptance or energy aperture. Could someone explain to me what is meant by this term? It is used in a lot of literature but I haven't been able to find a...

help Calculus! Homework Statement got this question, and i need help. lost it lol. this is the sort of question i have to do for me assignment. Help in going through it Homework Equations Hot metal storage tank: is rectangle with a square cross section total surface area is...

Could somebody tell what is the newest ideas in energy storage technology? Is there some new effects discovered, such as quantum or electron related? Is this possible to have energy storage which would be average in energy density between chemical and nuclear?

As I know main limitation of superconducting energy storage is Lorentz forces which are created by magnetic field and ultimately destroy a superconducting ring. But there exist so called plasmon waves or plasma waves which could spread in metals and plasma. If I no make mistake they don't...

This paper "Earth's energy imbalance: Confirmation and implications. Science, 308, 1431-1435 Hansen et al" pdf available http://pubs.giss.nasa.gov/abstracts/2005/Hansen_etal_1.html" seems to have been very influential in research on climate change. The basic argument is that very little of...

Homework Statement The emf of an automobile storage battery is 12.20 V, and its internal resistance is 0.008 ohms. what is the terminal voltage of the battery when the starter motor is drawing 150. A from the battery? Homework Equations N/A The Attempt at a Solution I have no...

Is it Theoretically possible to build a superconducting motor/generator/energy storage device all at superconducting temperatures? The device needs to operate in vacuum, accelerate and decelerate with only field energies exiting the vacuum chamber. I don't have much faith in batteries at 4oK...

Lets assume an Alien race that's 1.2 billion years ahead of human civilization in terms of technology. Do you think they'd be able to store the entire internet in one of their single device? If not, then how much storage do you think they'd have? Discuss..

Hi, I need to find a solution to the following problem: A 45000 bbls water storage tank has a 24" water inlet, the water that enters the tank is causing a lot of waves. These waves are causing damage to an oil skimmer float located in the surface of the water. Our client wants to find a...

Hi everyone! This is the first time I post a topic here so forgive me if there are some shortcomings. I have just taken a project about design and implementation of a compressed air storage and then release compressed air to produce electricity. This is not new project and has been installed...

HELP!A problem on electric energy storage Homework Statement when two capacitors are connected in parallel and then connected to a battery, the total stored energy is 5.0 times greater than when they are connected in series and then connected to the same battery. What is the ratio of the two...

An S-layer protein is 3nm is diameter. Calculate number of proteins per mm3 of membrane. If the protein is used to pattern a surface used for data storage - each protein molecule can position one magnetic particle (1bit) compare this type of storage with current hard disks. Just one...

I was just curious if anyone knows of any new and upcoming methods of hydrogen storage to be used for fuel. The only three methods I know about are hydrides, liquid hydrogen, and compressed tank storage. Does anyone know of any new methods that are in development? I know there's a lot of money...

Homework Statement A storage reservoir is continuously filled through a pipe delivering 2.2cfs. The reservoir is circular in shape with a diameter of 20 ft. The height of the tank is 12ft. A pump operates for the last 5 minutes of successive 20 minute intervals, draining out 350 cubic feet of...

I am looking at creating a music library on my computer of the hundreds of CD I own. My first question is what should I be using for quality? I know I should use the 320 for archiving, but I am not sure I need the archives with the CDs still available if needed. Just looking for opinions on...

Hi, Im a pretty decent MATLAB and maple user and now I am starting to use mathematica, because I've heard good things about it. I had some simple questions about it that I was hoping someone could answer. 1.) What is the best way to store data in mathematica? Do people use matricies like...

Here is my problem [the last one of a lot that I already got all right and have to turn in by midnight - so you can sense my frustration, lol.] A .39microF capacitor is charged by a 1.5 V battery. After being charged, the capacitor is connected to a small electric motor. a) Assuming 100%...

this EurekAlert page links to a MIT press release describing the operation of the new catalyst and potential applications http://search.eurekalert.org/e3/query.html?qt=Nocera&col=ev3rel&qc=ev3rel&x=12&y=16 Dan Nocera is the main person responsible. Here's a ScienceDaily account...

The attachment shows an example from a book on how to size a hot water storage tank (for tap water). During the 24h period a total of 55 kWh is used. The red curve shows the variation in usage along the period. The slope of the green lines is determined by the heat source's power, in this case...

Homework Statement A cylindrical storage tank 8 feet in diameter and 20 feet long is lying horizontally on the ground. The tank is full of olive oil whose weight density is 57 lb/ft^3. How much work does it take to pump the olive oil to a level of 6 feet above the top of the tank? Almost...

Homework Statement Given that 1,206,900 liters of oxygen are required for a round-the-world trip for a hot-air balloon with a crew of three, and given that carbon-fiber wrapped bottles have a maximum pressure of approx 4500 psi, what total volume of pressure vessel would be necessary to...