Does anybody know a manufcturer of Manganese Copper Ferrites? I am looking for a ferrite that has a low curie temperature and have found a paper that shows various MnCu ferrites with curie temps between 50-100 degC. They seem to have been used i nthe 1960s and 70s but were surpassed by other...
Hello all,
I am looking into how to model the material properties of various materials in FEA. I need to be able to use BH curves in this process. If I wanted to use the Preisach model for hysteresis, how can I get the parameters alpha, beta and gamma? Can they be calculated from a material BH...
hello all again,
quick qs
I need to get a 1.5v supply from a 9v battery.
I want to use a zener diode to do this.
attached are two drawings 1st with a 7.5V zener in series, the second with a 1.5v zener in parallel. Am I right in thinking that you cannot get a 1.5V zener diode. Therefore does the...
Hello all,
Has any body else experienced this problem?
A colleague has been using a Sony SIR1000 Dat recorder and used to read the data from the DAT tape using PCSCAN 3. I believe this is the software that came with the recorder.
After reading the tape of say x recordings apparently what you...
I am doing a quick look into health and safety ear defenders for gun shot. Does anyone have an idea of the frequency spectrum of a typical gun shot? I have various sources that give a dB figure but no frequency info. ANy one got or know of a graph showing this data? Any gun will do fo now but...
Hello All,
Does anybody have a formula that would enable me to calculate the attenuation upwind of an noise source due to wind speed and distance? Similarily, enhancement of the noise level downwind.
Thanks
Andrew
Hello all,
I have been trying to find this information everywhere but without much luck. I want to know the formula for calculating the noise attenuation in a HVAC systme due to the inclusion of a duct. I am aware that for a curved elbow the attenuation is 0dB, but what about a rectangular bend...
This follows on from an earlier thread (Centre of Polyline and scale) but I thought that it is different enough to warrant a new thread. I am using AutoCAD LT at the moment and cant find the tool for running lisps. Is this possibly because AutoCAD LT can't do this? So I have had a go at creating...
Is it possible to draw a polyline then find out its centre. The polylines will mainly make up 2D boxes but they could be any shape. What I want to do is draw the line and scale it using its centre point.
It would also be great if I could do this in a lisp so that I can do it over again quickly...
I have a layout of a building in dwg format. I have analysed the building in Excel and have specific values to be applied in each room. What In want to do is colour each room depending on the number calculated in Excel. I know I can do this with a hatch but to do this manually for each room...
I am looking for a good FE package for modelling underwater magnetic signatures, OPERA-3D by vector fields has been suggested, does anyone have any first hand experience of this or can they recommend any other package? Are there any limitations/advantages to using OPERA-3d above anything else...
How can I write a macro that hyperlinks all the cells in a range to sheets that are named after these cells (kind of like an index page).
This is the code that I have generated.
ActiveSheet.Hyperlinks.Add Anchor:=Selection, Address:="", SubAddress:= _
"'2C'!A1"...
I currently have just graduated with a BSc in Physics and am working as an acoustics engineer. Should I do a masters in Engineering with this background? I also dont want to give up working to do it so would it be worth doing it evenings and weekends? I want to do it for my own slef esteem but...
I found a lovely program in the shareware to give me the x,y,z coordintes of a point. The thing is it printas themn to a table in AutoCAD in the model space. Is there anyway to copy text from AutoCAD to excel?
the program is called XYZTBL.lsp
if someone could give me a lisp routine that does it...
Further to my earlier thread - The list command lists all the coordinates ofa selected object - GREAT - but it also contains lots of other information which is useless to me. How can I delete this easily without having to resort to putting it in notepad and doing it myself?
Thanks in advance
