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For researchers who perform massive simulations on distributed computing systems, portals mean Web environments that make computing resources and services accessible via Web browsers. Such portals are typically referred to as Grid portals, or science gateways. Grid portals are Web interfaces that are integrated with PC, cluster or supercomputer based computing resources. These environments very often include high level services that are not included in the underlying infrastructure, they are implemented on the portal server instead. Such services can be brokers, load balancers, data replica services, data mirroring and indexing components. All these services together with the front-end portal provide an integrated solution that enables e-scientists to deal with various aspects of data-intensive research. Usage scenarios in such portals often involve the generation and storing of research data, analysis of massive datasets, drawing scientific conclusions and sharing all these entities with colleagues or with the general public. Scientists of these portals tend to organize their frequently used steps of simulations into reusable components, called workflows. Workflows provide repeatable, traceable experiments and improve both the productivity and quality of research.

Hardware resources, software services, applications and workflows that are made accessible through Grid portals are typically provided by multiple independent organizations and are managed by different administrators. Portals connect to these distributed entities in a service oriented fashion, namely through well defined interfaces that expose the functionality of each shared component. For the sake of scalability and fault tolerance these services are accessed by the portal through some catalogues. A typical difficulty of portal design is how to integrate the content from the dynamic services of the catalog into a user friendly view that is ergonomic, provides coherent information, and at the same time flexible and easily customizable for different user preferences.

In the early years of Grid computing the portal systems were implemented using various different programming approaches and languages. Despite Grid solutions have much simplified since those early years, developers of science gateways must still know relatively high number of technologies. Portal operators must closely follow the evolution of Grid middleware services, because updates on the portal are required when the Grid middleware is changed. While enterprise portals also demand regular updates due to changes in the back-end systems, the technological evolution in Grid computing is more rapid than in business environments. As grid portals shield users away from middleware evolution, they are very often the only way for scientists to stay connected with Grids over longer period of time.

There are a few other technical difficulties that are specific to Grid portals. The issue of how to map the security model of Grid systems to the security model of the “Web” is one of these. While Web portals identify and authenticate users with account-password pairs, Grids and other sorts of distributed computing environments use certificates. Certificates enable users to authenticate only once in a distributed system and perform complex operations without being asked for account details over and over again (e.g. in every stage of the orchestration of a workflow). By certificates the users can delegate their access rights to workflow managers, brokers, catalogs and other services that perform activities on their behalf. Grid portals typically translate username-password pairs to certificates by either through certificate repositories (such as MyProxy), or by importing certificates from Web browsers.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Research in a connected world. OpenStax CNX. Nov 22, 2009 Download for free at http://cnx.org/content/col10677/1.12
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