A comparison of action transitions in individual and collaborative exploratory web search

Collaboration in Web search can be characterized as implicit or explicit in terms of intent, and synchronous or asynchronous in terms of concurrency. Different collaboration style may greatly affect search actions. This paper presents a user study aiming to compare search processes in three different conditions: pair of users working on the same Web search tasks synchronously with explicit communication, pair of users working on the same Web search tasks asynchronously without explicit communication and single users work separately. Our analysis of search processes focused on the transition of user search actions logged in our exploratory Web search system called Collab-Search. The results show that the participants exhibited different patterns of search actions under different conditions. We also found that explicit communication is one of the possible sources for users to obtain ideas of queries, and the explicit communication between users also promotes their implicit communication. Finally this study provides some guidance on the range of behaviors and activities that a collaborative search system should support. © Springer-Verlag 2012

Starch-based gel electrolyte thin films derived from native sago (Metroxylon sagu) starch

Starch-based gel electrolyte (SbGE) thin films were prepared by mixing native sago starch with different amounts of glycerol, and subsequently doped with various types of ionic salts. SbGE thin films showed substantially enhanced mechanical properties and ionic conductivity through incorporating optimal composition of native sago starch, glycerol, and ionic salts. A maximum room temperature ionic conductivity of the order of 10−3 S cm−1 was achieved for optimized SbGE thin film consisting of 80 wt% of native sago starch and 20 wt% of glycerol, and doped with 8 wt% of LiCl. SbGE thin films were characterized by Fourier transformed infrared spectrometry, scanning electron microscopy, and electrochemical impedance spectroscopy. Due to their favorable mechanical properties, high ionic conductivity at room temperature, ease of preparation, environmentally benign, and cheap, SbGE thin films show high potential utility as gel electrolyte materials for the fabrication of solid-state electrochemical devices