Author Archives: dougaj4

AS 3600 and RC Design Functions 8.01

Posted on November 13, 2018

The updated RC Design Functions spreadsheet (presented here) included an updated UMom function to find the ultimate strength of a rectangular section under combined bending and axial load; but I omitted to include the revisions to the alpha2 and Gamma … Continue reading →

Posted in Beam Bending, Concrete, Excel, Newton, UDFs, VBA | Tagged , , , , , , | Leave a comment

Falling feathers and hammers

Posted on November 9, 2018

It is well known that at the end of the Apollo 15 Moon landing, Commander David Scott dropped a hammer and a feather to demonstrate that they would accelerate at the  same rate, and land on the ground together: What is … Continue reading →

Posted in Newton | Tagged , , , | Leave a comment

More iterative solvers

Posted on October 28, 2018

Following the recent post on using Brent’s Method solvers on an array (Iterative solvers and arrays), here is another example with an engineering related problem.  The example is included in the xlScipy3 spreadsheet, which can be downloaded from: xlScipy3.zip The depth … Continue reading →

Posted in Arrays, Beam Bending, Concrete, Excel, Link to Python, Maths, Newton, NumPy and SciPy, UDFs, VBA, xlwings | Tagged , , , , , , , , | Leave a comment

Quite Good

Posted on October 26, 2018

This song has actually appeared here before, but it was a bit buried, so here it is again; Robin Williamson with a quite good interpretation of Like a Rolling Stone:    

Posted in Bach | Tagged , , , | Leave a comment

Iterative solvers and arrays

Posted on October 21, 2018

A recent thread at Eng-Tips was looking for a solution to the problem described  below: The solutions to this problem described below can be downloaded from: ItSolve.zip and xlScipy3.zip The ItSolve.xlsb spreadsheet contains a user defined function (UDF) to solve iterative … Continue reading →

Posted in Arrays, Charts, Excel, Link to Python, Maths, Newton, NumPy and SciPy, UDFs, VBA, xlwings | Tagged , , , , , , , | 1 Comment

Australian Greenhouse Gas Emissions

Posted on October 3, 2018

What the Australian  Government says: PM claims Australia will meet Paris target ‘in a canter’ despite emissions climbing. Morrison says rate of increase not as high as previous years and renewables investment will ensure Australia meets commitment pm-claims-australia-will-meet-paris-target-in-a-canter-despite-emissions-climbing What the … Continue reading →

Posted in Climate, Newton | Tagged , , | 1 Comment

Time in hours and minutes between two dates

Posted on September 30, 2018

Dates and times in Excel are stored as a date number, which is the number of days since 1 January 1900, with the value after the decimal point representing the time of day. To calculate the number of hours between … Continue reading →

Posted in Excel | Tagged , , , , | 4 Comments