2 research outputs found
Implementation and Reconfiguration of Robot Operating System on Human Follower Transporter Robot
Robotic Operation System (ROS) is an im- portant platform to develop robot applications. One area of applications is for development of a Human Follower Transporter Robot (HFTR), which can be considered as a custom mobile robot utilizing differential driver steering method and equipped with Kinect sensor. This study discusses the development of the robot navigation system by implementing Simultaneous Localization and Mapping (SLAM)
Synthesis and Characterization of Amphoteric Xylan-type Hemicelluloses by Microwave Irradiation
In this study, a novel amphoteric macromolecule was synthesized
by sequential incorporation of carboxymethyl and quaternary ammonium
groups into the backbone of xylan-type hemicelluloses under microwave
irradiation. The reaction parameters such as the molar ratio of reagent
(NaOH or 3-epoxypropyltrimethylammonium chloride)/anhydroxylose unit
in hemicelluloses, the temperature, and the reaction time were investigated
to optimize the reaction condition. The maximum degrees of substitution
(DS) of carboxymethyl and quaternary ammonium groups under the optimum
reaction condition were 0.90 and 0.52, respectively, exhibiting a
higher efficiency as compared to the conventional heating method.
Moreover, the thermal stability and weight-average molecular weight
of amphoteric hemicellulosic derivatives decreased as compared to
the native hemicelluloses. The viscosity, elastic modulus, and loss
modulus of the amphoteric biomacromolecules increased with the increasing
DS of quaternary ammonium groups in aqueous solution due to stronger
electrostatic attraction. This study provides an efficient and rapid
method to prepare amphoteric biomacromolecules