View allAll Photos Tagged node
The prototype for the GPS allspice node. The PCB board is still in the works which will allow everything to mount onto a single unit and also give an SMA output for the RF section. The EZ430 also has a distinct lack of crystals which is not good for temperature stability. But the unit does work under terrestrial application from -20 to +44 degrees C!
The processor decodes the NMEA sentences and formats a packet containing the lat, lon, alt, speed, fix information and various telemetry parameters like voltages and temperatures. The Ublox is capable of 4Hz, though the Allspice network will typically run between 1 and 0.1 Hz. which is programmable over the radio.
Source: livinghistories.newcastle.edu.au/nodes/view/17228
This image was scanned from a negative in the Bert Lovett collection. It is part of the Norm Barney Photographic Collection, held by Cultural Collections at the University of Newcastle, NSW, Australia.
This image can be used for study and personal research purposes. If you wish to reproduce this image for any other purpose you must obtain permission by contacting the University of Newcastle's Cultural Collections.
If you have any information about this photograph, please contact us or leave a comment in the box below.
Source: livinghistories.newcastle.edu.au/nodes/view/41936
This photo appeared in the University News, Volume 11, Number 16, October 7 to 16, 1985. The text was:
"Higher Degree Reports
Dr Edwin Galea is soon to take up a postdoctoral position in the Department of Applied Mathematics, University of St Andrews, Scotland. The Departments main research interests are in astronomy and astrophysics and Dr. Galea will be engaged in research on the behaviour of magnetic fields on the solar surface.
Dr Galea recently completed a PhD under the supervision of Dr Warren Wood of the Department of Mathematics, Statistics and Computer Science.
The thesis, entitled Rotating Magnetic Upper Main Sequence Stars, was concerned with the theoretical description of the magnetic fields which occur in a particular class of stars known as Ap stars (the p stands for peculiar). Magnetic fields, like gravitational fields, permeate the entire Universe. The earth has its own magnetic field. It is dipolar in nature and has a surface field strength of about 0.6 gauss, at the poles. The sun has a large scale field up to 10000 gauss. The appearance of sunspots on the solar surface is due to the presence of these strong localised fields. Despite the presence of a magnetic field in the sun it is not classified as a “magnetic star” since at stellar distances its field would go undetected. By far the most numerous of the known magnetic stars are the A stars, which seem to cover the entire stellar surface, range from a few hundred gauss to about 34000 gauss.
In the thesis Dr Galea was concerned with the construction of mathematical models which would describe the structure of the magnetic fields of these stars. The modelling of these stars is complicated by the fact that in addition to proposing a sizeable magnetic field these stars ar also rotating. The mathematical description is made more complex in this situation since there is no natural symmetry for the problem. The easiest way to visualize this is to consider a sphere which rotates about some axis while the magnetic field has symmetry about another axis which is at an angle, the obliquity angle, to the axis of rotation. The observational evidence shows that the obliquity angle may assume and value between zero and ninety degrees. Previous theoretical studies on this problem imposed the restriction that the obliquity angle be either zero (aligned model) or ninety degrees (perpendicular model), purely for mathematical convenience. Predictions concerning the magnetic field for the aligned model were at odds with the perpendicular results. Results form the aligned model suggested that the more rapidly rotating the star the smaller the surface magnetic field. The opposite effect occurs in the perpendicular model. Why the two models should produce conflicting results was not understood, nor was it known what could be expected for stars with obliquity angles between the two extreme cases. One suggestion put forward in the literature was that large scale meditational circulation currents in the stellar interior might cause the differences predicted by the two models.
Galea formulated a general model in which the obliquity angle could be varied so that it was a parameter of the model. Thus it was possible to construct models in which the obliquity angle could assume any value from zero the ninety degrees. The mathematical formulation of such problems requires many equations to describe the physical system. These equations can be solved by using numerical techniques which require many hours of computer time. Investigation of these models revealed that a critical obliquity angle exists. Stellar models in which the obliquity angle is less than 55 degrees displays the same trends as the aligned model, while stars in which the obliquity angle was greater than 55 degrees followed perpendicular trends. Galea was able to conclude that the differences between the two model types arise from the geometry of the magnetic field. Some recent observational evidence seems to confirm the finding of Galea in that stars with obliquity angles greater than 55 degrees seem to be rotating quite rapidly and having large surface fields.
Galea was also able to show that meditational currents in the stellar interior merely serve to enhance the differences between magnetic fields whose obliquity angle lies on opposite sides of the critical angle.
If further observational investigations support Galea’s findings then we will be reasonably confident concerning our description of magnetic field in these peculiar stars."
This image was scanned from a photograph in the University's historical photographic collection held by Cultural Collections at the University of Newcastle, NSW, Australia.
If you have any information about this photograph, or would like a higher resolution copy, please contact us or leave a comment.
Source: livinghistories.newcastle.edu.au/nodes/view/14554
This image was scanned from a film negative in the Athel D'Ombrain collection [Box Folder B10399] held by Cultural Collections at the University of Newcastle, NSW, Australia.
This image can be used for study and personal research purposes. If you wish to reproduce this image for any other purpose you must obtain permission by contacting the University of Newcastle's Cultural Collections.
Please contact us if you are the subject of the image, or know the subject of the image, and have cultural or other reservations about the image being displayed on this website and would like to discuss this with us.
If you have any information about this photograph, please contact us or leave a comment in the box below.
Source: livinghistories.newcastle.edu.au/nodes/view/29246
This photograph was taken on 22 September 2013 by Barry Howard at the annual memorial service at the Jim Comerford Miners Memorial Wall in Aberdare. The service was attended by many dignitaries and families of miners killed in the industry.
This photograph is from the collection of Barry Howard, who was an electrician at local coal mines such as Hebburn No. 2 and Northern (Rhondda) Colliery, and at Saxonvale Colliery, further up the Hunter Valley. Mr Howard has very kindly permitted us to to publish these photographs on this website for the benefit of researchers and for those who served in the mines and their families.
If you have any information about the photograph, please contact us or leave a comment. We greatly value your contribution.
Please contact us if you are the subject of the image, or know the subject of the image, and have cultural or other reservations about the image being displayed on this website and would like to discuss this with us.