A multivariate approach based on hierarchical cluster analysis has been proposed to study the pattern of rainfall in different mandals of Visakhapatnam district of Andhra Pradesh. The approach was applied to study the rainfall patterns of 42 mandals based on 25 years of rainfall data of Visakhapatnam district from 1986-2010. The application of hierarchical clustering approaches single linkage, ...

Article history: Received: 20 Jan 2011 Revise: 11 Feb 2011 Accepted: 25 Feb 2011

Article history: Received: 07 Dec 2011 Revised: 20 Dec 2011 Accepted: 01 Feb 2012

Article history: Received: 20 Nov 2010 Revised: 27 Jan 2011 Accepted: 09 Feb 2011

1. Exam program 1 2. Lesson 1 (Jan. 20, 2015): Convex functions 2 3. Lesson 2 (Feb. 3, 2015): Convex duality 2 4. Lesson 3 (Feb. 10, 2015): Subgradient of expectations I 2 5. Lesson 4 (Feb. 17, 2015): Subgradient of expectations II 3 6. Lesson 5 (March 3, 2015) 3 7. Lesson 6 (March 17, 2015) 3 8. Lesson 7 (March 24, 2015) 3 9. Lesson 8 (last lesson: March 31, 2015) 3 10. Additional material 3 1...

Received 20 Feb.2014 Revised 18 Mar. 2014 Accepted 19 May 2014 Available online 16 Jun. 2014

In this paper, we examine the observational soft Xray flares and the relationship with photospheric vector magnetograms in the active region (NOAA 7070). We analyze the soft X-ray flare on Feb. 24-25, 1992, especially the pre-flare and the relationship with the highly sheared photospheric vector magnetic field near the photospheric magnetic neutral line. We find that the initial reconnection of...