Public opinions on a topic may change over time. Topic Sentiment change analysis is a new research problem consisting of two main components: (a) mining opinions on a certain topic, and (b) detect significant changes of sentiment of the opinions on the topic and identify possible reasons causing each such change. In this paper, we discuss topic sentiment change analysis using data on the Web. W...

In this paper we describe a technique for analyzing textual conversations, Dynamic Topic Analysis, and a tool, VisualDTA, for automatically creating visualizations of data coded according to this technique.

A set of panchromatic absorbers exhibiting long excited-state lifetimes in both polar and nonpolar media has been prepared. The architectures are based on a porphyrin strongly coupled electronically to 1-4 perylene-monoimides via ethyne linkers. The constructs should find utility in molecular solar-conversion systems.

Vindija cave in Croatia has yielded the youngest securely dated Neandertal skeletal remains in Central/Eastern Europe. In addition, these remains have been found in association with archaeological material exhibiting Upper Paleolithic elements. Due to its geographic location and date, the Vindija remains are particularly crucial for the understanding of initial modern human peopling of Europe a...

Stability of Learning in Classes of The relationship to work by Mozer, [5], on induction of temporal structure, is briefly described in [13]. Recurrent and Feedforward Networks In the research reported here, the task is similar to Elman’s: predicting the next letter in a word (or the end of William H. Wilson the word) from the current letter and the representation of past letters held in the st...

A strategy to optimize the photoswitching efficiency of rigid, linear multiazobenzene constructs is presented. It consists of introducing large dihedral angles between azobenzene moieties linked via aryl-aryl connections in their para positions. Four bisazobenzenes exhibiting different dihedral angles as well as three single azobenzene reference compounds have been synthesized, and their switch...

In this paper we study a classical model concerning occurrence of words in a random sequence of letters from an alphabet. The problem can be studied as a game among (m + 1) words: the winning word in this game is the one that occurs first. We prove that the knowledge of the first m words results in an advantage in the construction of the last word, as it has been shown in the literature for the...