Difference between IPFS and Filecoin? [closed] - bitcoin

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They both seems to store files in a decentralized network. So what's the difference between them in terms of data structure and algorithms they use? And also what's the difference between them in terms of use cases?
If I store a file in IPFS or Filecoin, will it remain there forever or it may get lost?

IPFS does storage and content-based addressing. Filecoin is just a way to incentivize people to store IPFS content.
So it's not really easy to tell the difference because they are not comparable. Filecoin just works on top of IPFS.

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how to find/ incorporate forced convection in dymola [closed]

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Am doing a project which is about thermal management of the 18650 lithium-ion pack. I am currently simulating the model under natural convection. But I am supposed to run under forced convection. How/ where can we find forced convection in Dymola
You can use Modelica.Thermal.HeatTransfer.Components.Convection but you have to provide a value/equation for the thermal conductance Gc using a correlation from a textbook that fits the flow situation e.g. flow around / along a cylinder.

Is there any abstraction layer to work with GFS or HDFS? [closed]

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The SQL and NOSQL databases are used by facebook
1.Whether it uses GFS or HDFS or BOTH or some other?
2.What are the different Abstraction application layer available to work on HDFS AND GFS ??
3.I heard about HADOOP , How Map Reduce works ?
kindly narrate the advantages.
And also narrate about the second question deeply.
This is not a real question.
There are really thousands of articles out there.
To guide you into the right direction:
Facebook uses a lot of different technologies. SQL and NoSql. It is known that they use a lot Cassandra. Have a look at this video from the director of engineering from Facebook.
Here are also some more links of the Facebook architecture:
Facebook Architecture

is Dynamic form rendering in iOS app allowed? [closed]

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In an app I need to download an xml(metadata for form to be rendered) from remote and then render a form accordingly. I wonder if this is allowed under apple guidelines as so far I did not encounter any such thing in HIG guidelines.
Any help is highly appreciated.
I think its allowed (I don't see any reason to reject such apps). In few of my apps I am rendering forms based on some conditions.
Yes, it is allowed as long as the content you render dynamically, is okay as far as the guidelines are concerned. You may compare this to having a UIWebView load dynamic content off of the web.

Will Microsoft make exceptions on their BizSpark entry requirements [closed]

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The company I work for is about three and a half years old but we haven't started developing software until recently. Is the less than three years old rule absolute or will they make exceptions?
I don't realy know if that's the reason you are interested in bizspark but if you sign up for the free software through this:
http://www.asp.net/downloads
and then follow the links on the e-mails, you can get legitimate copies/keys of the software!

How big websites handle with big traffic - common solutions [closed]

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I wondered how big websites are handling thousands of visitors daily and how they handle with really big traffic.
I made research and discover that many of them are using Amazon Simple Storage Service, so they must have all pages ganerated as static html as it possible to storage only static files on the S3. Then also update of the website is not difficult (only replacing static files). Is it possible or I am wrong? Any other similar solutions?
Yahoo as a fantastic article about how to speed up websites and optimizing traffic.