1,720,966 research outputs found
Apigenin 7-glucoside and its 2′′- and 6′′-acetates from ligulate flowers of Matricaria chamomilla
No full textDried ligulate flowers of Matricaria chamomilla contain 7-9% glucosides of apigenin and 0.3-0.5% free apigenin. Glucosides were identified as apigenin 7-glucoside and a 1:3 mixture of the 2′′- and 6′′-acetates, as determined by 13C NMR analysis
High-performance liquid chromatography of cis- and trans-en-in-dicyclo ethers (spiro ethers) in Matricaria chamomilla L. flowers and in chamomile extracts
No full textApigenin 7-glucoside diacetates in ligulate flowers of Matricaria chamomilla
No full textFrom ligulate flowers of Matricaria chamomilla was isolated a mixture of apigenin 7-O-β-glucoside diacetates, which was shown to be based on (2′′, 3′′)- and (3′′, 4′′)-diacetates
Evaluation of coumarins and dicycloethers in Matricaria chamomilla flowers and chamomile extracts by reverse-phase HPLC
No full textIntegration of Virtul Reality and Haptics to Carry Out Ergonomic Tests on Virtual Contro Board
No full textThis work presents the results of a research project that evaluated the possibility to carry out ergonomic analyses on virtual prototypes that permitted tactile interaction. We propose an approach based on Virtual Reality (VR) and haptics: the former to improve visual rendering of a digital model, the latter to permit tactile interaction. The products considered were control boards. Atomic components such as knobs, sliders and buttons are employed. The paper presents the architecture of an ergonomic workstation and its first implementation based on commercial systems and ad hoc haptic devices specifically developed for the purpose. Major problems related to a VR environment, such as visualisation and human body tracking, are discussed; the architecture of haptic devices and technical solutions to achieve a satisfactory haptic rendering are presented. Finally, the paper proposes a test procedure and presents the results of tests on the behaviour of ergonomic workstation components. Work in progress and future developments conclude the paper
A Mixed Virtual Reality-Haptic Approach to Carry Out Ergonomic Tests on Virtual Prototypes
No full text
- …
