In order to enable an iCal export link, your account needs to have an API key created. This key enables other applications to access data from within Indico even when you are neither using nor logged into the Indico system yourself with the link provided. Once created, you can manage your key at any time by going to 'My Profile' and looking under the tab entitled 'HTTP API'. Further information about HTTP API keys can be found in the Indico documentation.
Additionally to having an API key associated with your account, exporting private event information requires the usage of a persistent signature. This enables API URLs which do not expire after a few minutes so while the setting is active, anyone in possession of the link provided can access the information. Due to this, it is extremely important that you keep these links private and for your use only. If you think someone else may have acquired access to a link using this key in the future, you must immediately create a new key pair on the 'My Profile' page under the 'HTTP API' and update the iCalendar links afterwards.
Permanent link for public information only:
Permanent link for all public and protected information:
Localized orbitals, strong correlation and coupled cluster theory
(Lawrence Berkeley National Laboratory, Berkeley CA, USA)
I will start by discussing various orbital localization schemes, and present some results with an approach we have recently developed  to generate maximally localized Wannier functions that preserve sigma-pi orbital separation without the need for any special considerations .
In the latter part of the talk I will discuss the treatment of systems with strong correlation using coupled-cluster theory, especially focusing on the perfect pairing hierarchy of methods that are essentially based on a localized orbital description; the perfect pairing hierarchy of methods . These are extremely cost-efficient approximations to the complete active space self-consistent field (CAS-SCF) method that are routinely able to treat problems of unforeseen sizes: several hundred electrons in several hundred orbitals on a single workstation.
We have recently finished the implementation of orbital optimisation for the methods, applications of the methods will be presented for polyacenes in the full valence space up to 12acene (238e,238o).
 S. Lehtola and H. Jónsson, J. Chem. Theory Comput. 10, 642 (2014). DOI: 10.1021/ct401016x
 E. Ö. Jónsson, S. Lehtola, M. Puska, and H. Jónsson, J. Chem. Theory Comput. 13, 460 (2017). DOI: 10.1021/acs.jctc.6b00809.
 S. Lehtola, J. Parkhill, and M. Head-Gordon, J. Chem. Phys. 145, 134110 (2016). DOI: 10.1063/1.4964317.