Cooperative Localization on Computationally Constrained Devices

Cooperative localization is a useful way for nodes within a network to share location information in order to better arrive at a position estimate. This is handy in GPS contested environments (indoors and urban settings). Most systems exploring cooperative localization rely on special hardware, or extra devices to store the database or do the computations. Research also deals with specific localization techniques such as using Wi-Fi, ultra-wideband signals, or accelerometers independently opposed to fusing multiple sources together. This research brings cooperative localization to the smartphone platform, to take advantage of the multiple sensors that are available. The system is run on Android powered devices, including the wireless hotspot. In order to determine the merit of each sensor, analysis was completed to determine successes and failures. The accelerometer, compass, and received signal strength capability were examined to determine their usefulness in cooperative localization. Experiments at meter intervals show the system detected changes in location at each interval with an average standard deviation of 0.44m. The closest location estimates occurred at 3m, 4m and 6m with average errors of 0.15m, 0.11m, and 0.07m respectively. This indicates that very precise estimates can be achieved with an Android hotspot and mobile nodes

Primary recrystallization in a grain oriented silicon steel: On the origin of Goss {110}<001> grains

1) The αlγ fibres and their respective components did not change significantly between 70 and 90% deformation, while the volume fraction of Goss dropped slightly but significantly at the higher reduction. After recrystallization, γ increased but α slightly decreased 2) Two types of Goss orientations were observed as part of grain interior strain localizations in deformed but recovered samples - inclined respectively at 20 ± 4° and 37 ± 5° with the RD. The respective Goss bands formed clusters of recrystallized grains, also bearing the signature of the inclination (with RD) of the parent Goss bands. Relatively more Goss (within 20° of exact Goss) grains appeared from 37° bands (which were also wider along RD in the deformed microstructure) than from 20° bands. However, the 20° bands contained a much higher fraction of precise Goss grains (i.e. within 5° of exact Goss orientation). The predominance of 20° bands in 90% deformed and subsequently recrystallized material was reflected in relatively fewer but generally more perfect primary recrystallized Goss grains (i.e. with lower deviations from the exact Goss orientation). 3) Grains next to coarse second phase particles, possibly forming by PSN, were observed at the very early stages of recrystallization. This was closely followed by recrystallization of 20° and 37° Goss clusters, although no preference in recrystallization between Goss grains of the two clusters was observed.status: publishe

Storage in the yolk platelets of low MW DNA produced by the regressing follicle cells.

The present work was carried out to clarify the nature and origin of the yolk DNA present in vitellogenic oocytes of the lizard Podarcis sicula. Morphological and biochemical evidences indicate that it has an intrafollicular origin, from the apoptotic bodies resulting from follicle cells regression at the end of previtellogenesis. This conclusion is reinforced by the observation that the oocyte membrane, in in vitro experiments, is unpermeable to exogenous DNA. Biochemical evidences reveal that the yolk DNA has a low (200bp) molecular weight and this suggests that it is produced by the endonucleases typically involved in apoptotic DNA laddering. Indeed, immunocytochemical analyses demonstrate that follicle cells contain significant amounts of DNAse I. In immunoblots, carried out during different periods of the ovarian cycle, the enzyme shows a MW of about 33, 66 or 100 kDa thus indicating that its activity in the follicle of Podarcis is modulated by dimerization and/or binding to regulatory factors

Storage in the yolk platelets of low MW DNA produced by the regressing follicle cells.

The present work was carried out to clarify the nature and origin of the yolk DNA present in vitellogenic oocytes of the lizard Podarcis sicula. Morphological and biochemical evidences indicate that it has an intrafollicular origin, from the apoptotic bodies resulting from follicle cells regression at the end of previtellogenesis. This conclusion is reinforced by the observation that the oocyte membrane, in in vitro experiments, is unpermeable to exogenous DNA. Biochemical evidences reveal that the yolk DNA has a low (200bp) molecular weight and this suggests that it is produced by the endonucleases typically involved in apoptotic DNA laddering. Indeed, immunocytochemical analyses demonstrate that follicle cells contain significant amounts of DNAse I. In immunoblots, carried out during different periods of the ovarian cycle, the enzyme shows a MW of about 33, 66 or 100 kDa thus indicating that its activity in the follicle of Podarcis is modulated by dimerization and/or binding to regulatory factors