Retrospective analysis of the Spitak earthquake

Based on the retrospective analysis of numerous data and studies of the Spitak earthquake the present work at- tempts to shed light on different aspects of that catastrophic seismic event which occurred in Northern Arme- nia on December 7, 1988. The authors follow a chronological order of presentation, namely: changes in geo- sphere, atmosphere, biosphere during the preparation of the Spitak earthquake, foreshocks, main shock, after- shocks, focal mechanisms, historical seismicity; seismotectonic position of the source, strong motion records, site effects; the macroseismic effect, collapse of buildings and structures; rescue activities; earthquake conse- quences; and the lessons of the Spitak earthquake

Implementation of push notification using SignalR and WCF

Komunikacijo med strežniki in odjemalci lahko realiziramo na več načinov. Osnoven način je, da odjemalec povprašuje in strežnik odgovarja. V primeru, ko odjemalec ne ve, kdaj mu bo določena informacija na voljo, mora v intervalih spraševati strežnik. To je neučinkovito in boljša alternativa temu je, da strežnik obvešča odjemalce. Takemu načinu komunikacije pravimo potisno obveščanje. Implementacijo potisnega obveščanja smo izvedli s knjižnico SignalR in z ogrodjem WCF. Obe tehnologiji smo raziskali in ju primerjali. Za primerjavo tehnologij smo implementirali obveščanje o dogajanju v nadzoru različic kode. V našem primeru smo imeli dva tipa odjemalcev. En odjemalec je vmesnik za upravljanje z nadzorom različic kode Git. Ta obvešča strežnik o akcijah, ki se dogajajo nad kodo. Drugi tip odjemalca pa je namizna aplikacija in aplikacija za Windows Phone 8. Obe aplikaciji sprejemata obvestila o dogajanju v nadzoru različic kode, ki jim jih pošilja strežnik.Communication between servers and clients can be realised in several ways. A basic method is, when the client requests and the server responds. In case the client does not know, when the specific information will be available, it needs to ask the server in intervals. This is ineffective, and a better alternative is when the server informs the clients. Such communication is called server push. Server push was implemented with the SignalR library and with the WCF framework. Both technologies have been explored and compared. For comparison of technologies we implemented the notification of activity in revision control. In our case, we had two types of clients. The first client is an interface for managing the control of the Git revision control. It informs the server about actions, which take place over the code. The second client is a desktop application and an application for Windows Phone 8. Both applications receive notifications of activities in revision control