Temperature and Density in the Foot Points of the Molecular Loops in the Galactic Center; Analysis of Multi-J Transitions of 12CO(J=1-0, 3-2, 4-3, 7-6), 13CO(J=1-0) and C18O(J=1-0)

Fukui et al. (2006) discovered two molecular loops in the Galactic center and argued that the foot points of the molecular loops, two bright spots at both loops ends, represent the gas accumulated by the falling motion along the loops, subsequent to magnetic flotation by the Parker instability. We have carried out sensitive CO observations of the foot points toward l=356 deg at a few pc resolution in the six rotational transitions of CO; 12CO(J=1-0, 3-2, 4-3, 7-6), 13CO(J=1-0) and C18O(J=1-0). The high resolution image of 12CO (J=3-2) has revealed the detailed distribution of the high excitation gas including U shapes, the outer boundary of which shows sharp intensity jumps accompanying strong velocity gradients. An analysis of the multi-J CO transitions shows that the temperature is in a range from 30-100 K and density is around 10^3-10^4 cm^-3, confirming that the foot points have high temperature and density although there is no prominent radiative heating source such as high mass stars in or around the loops. We argue that the high temperature is likely due to the shock heating under C-shock condition caused by the magnetic flotation. We made a comparison of the gas distribution with theoretical numerical simulations and note that the U shape is consistent with numerical simulations. We also find that the region of highest temperature of ~100 K or higher inside the U shape corresponds to the spur having an upward flow, additionally heated up either by magnetic reconnection or bouncing in the interaction with the narrow neck at the bottom of the U shape. We note these new findings further reinforce the magnetic floatation interpretation.Comment: 40 pages, 23 figures, accepted by PASJ on Vol.62 No.

The Drag of a J-5 Radial Air-Cooled Engine

This note describes tests of the drag due to a Wright "Whirlwind" (J-5) radial air-cooled engine mounted on a cabin type airplane. The tests were made in the 20-foot Propeller Research Tunnel of the National Advisory Committee for Aeronautics. The drag was obtained with three different types of exhaust stacks: Short individual stacks, a circular cross section collector ring, and a streamline cross section collector ring

Ultrasonic motion analysis system - measurement of temporal and spatial gait parameters

The duration of stance and swing phase and step and stride length are important parameters in human gait. In this technical note a low-cost ultrasonic motion analysis system is described that is capable of measuring these temporal and spatial parameters while subjects walk on the floor. By using the propagation delay of sound when transmitted in air, this system is able to record the position of the subjects' feet. A small ultrasonic receiver is attached to both shoes of the subject while a transmitter is placed stationary on the floor. Four healthy subjects were used to test the device. Subtracting positions of the foot with zero velocity yielded step and stride length. The duration of stance and swing phase was calculated from heel-strike and toe-off. Comparison with data obtained from foot contact switches showed that applying two relative thresholds to the speed graph of the foot could reliably generate heel-strike and toe-off. Although the device is tested on healthy subjects in this study, it promises to be extremely valuable in examining pathological gait. When gait is asymmetrical, walking speed is not constant or when patients do not completely lift their feet, most existing devices will fail to correctly assess the proper gait parameters. Our device does not have this shortcoming and it will accurately demonstrate asymmetries and variations in the patient's gait. As an example, the recording of a left hemiplegic patient is presented in the discussion. (C) 2002 Elsevier Science Ltd. All rights reserved

DDASaccident628

Deminer was clearing the first 60 cm of one cluster heading toward the centre mine after he cleared the 1st 60 cm by one 1m width with no signals he moved his base stick a head to clear the next 60 cm, then he stepped on the area which considered to be cleared by the same deminer, accidently his foot went down due to the soil collapse under his foot (loose soil), the mine was in a depth of about 30 cm that when the deminer foot dived in the loosen soil he applied a pressure on the mine which activated the mine and caused the accident, note that from the accident result there was no direct contact between the deminer foot and the mine

DDASaccident628

Deminer was clearing the first 60 cm of one cluster heading toward the centre mine after he cleared the 1st 60 cm by one 1m width with no signals he moved his base stick a head to clear the next 60 cm, then he stepped on the area which considered to be cleared by the same deminer, accidently his foot went down due to the soil collapse under his foot (loose soil), the mine was in a depth of about 30 cm that when the deminer foot dived in the loosen soil he applied a pressure on the mine which activated the mine and caused the accident, note that from the accident result there was no direct contact between the deminer foot and the mine

DDASaccident628

Deminer was clearing the first 60 cm of one cluster heading toward the centre mine after he cleared the 1st 60 cm by one 1m width with no signals he moved his base stick a head to clear the next 60 cm, then he stepped on the area which considered to be cleared by the same deminer, accidently his foot went down due to the soil collapse under his foot (loose soil), the mine was in a depth of about 30 cm that when the deminer foot dived in the loosen soil he applied a pressure on the mine which activated the mine and caused the accident, note that from the accident result there was no direct contact between the deminer foot and the mine

DDASaccident628

Deminer was clearing the first 60 cm of one cluster heading toward the centre mine after he cleared the 1st 60 cm by one 1m width with no signals he moved his base stick a head to clear the next 60 cm, then he stepped on the area which considered to be cleared by the same deminer, accidently his foot went down due to the soil collapse under his foot (loose soil), the mine was in a depth of about 30 cm that when the deminer foot dived in the loosen soil he applied a pressure on the mine which activated the mine and caused the accident, note that from the accident result there was no direct contact between the deminer foot and the mine

Dissipative Shocks behind Bacteria Gliding

Gliding is a means of locomotion on rigid substrates utilized by a number of bacteria includingmyxobacteria and cyanobacteria. One of the hypotheses advanced to explain this motility mechanism hinges on the role played by the slime filaments continuously extruded from gliding bacteria. This paper solves in full a non-linear mechanical theory that treats as dissipative shocks both the point where the extruded slime filament comes in contact with the substrate, called the filament's foot, and the pore on the bacterium outer surface from where the filament is ejected. We prove that kinematic compatibility for shock propagation requires that the bacterium uniform gliding velocity (relative to the substrate) and the slime ejecting velocity (relative to the bacterium) must be equal, a coincidence that seems to have already been observed.Comment: arXiv admin note: text overlap with arXiv:1402.636

Can Foot Exercises and Barefoot Weight Bearing Improve Foot Function in Participants with Flat Feet?

Background: Unexplored in individuals with flatfoot (FF) is the potential of foot specific exercise and barefoot weightbearing (BWB) to improve foot function. The purposes of this study were A. To evaluate whether exercise and BWB alter foot muscle structure in participants with FF B. To evaluate whether exercise and BWB alters foot and ankle function in participants with FF C. To compare foot muscle structure and foot and ankle function between participants with FF to controls with neutral foot posture prior to exercise. Methods: Twenty participants with FF and 12 participants with neutral foot posture participated. Participants with FF completed 8 weeks of 4 foot exercises and 2 hours of BWB. Pre and post-exercise tests included: A. Diagnostic ultrasound to quantify abductor hallucis cross sectional area (CSA) B. Embedded force plates to assess paper grip test (PGT) force C. Heel rise height and repetitions D. The Foot and Ankle Ability Measure (FAAM), and qualitative data to capture potential benefits post-exercise.Control and FF data was compared pre-exercisewith independent t-tests. Two-way repeated measures ANOVA’s were used to compare participants with FF pre and post-exercise. The effect size index (ESI) was used to note the degree of improvement. Results: Participants with FF significantly improved in all variables except the FAAM. Muscle CSA increased from 0.27cm2 to 0.35cm2, a 12.9- 16.7% increase (P\u3c0.05).The PGT showed increased force post-exercise from 13.2N to 13.7N (P\u3c0.05). Post-exercise heel rise repetitions increased from 7.1-7.6 repetitions (P\u3c0.05).Compliance was 87.7% of prescribed exercises and 111% of time targeted for BWB. Conclusion: Foot specific exercises and BWB achieve sufficient training intensity to result in changes in foot function. The study confirms that training effects specific to the foot are achievable in participants with FF, and likely to patients with foot problems