Recent blog entries
This quartz clock seems to have reached its end-of life. A new battery helps,
but only for a few days.
This is a series of short articles in reverse chronological
order. I write a new entry every few weeks, with occasional long
gaps if there is nothing of great significance to say.
Sad to say, comments on Facebook get much more attention
from friends than this web site.
This web site has been moved to an Amazon EC2 instance.
It was previously hosted by the Sibername company, an Ottawa-based
hosting company which has provided me with excellent service for about
fifteen years. I decided on the conversion partly to reduce costs and
obtain more storage than is offered by their "Gold" plan, and partly
because the EC2-based site can be easily maintained with standard
In November 2023 it was moved to a second EC2 instance, and a certificate
from Lets Encrypt was installed, to ensure that it could be accessed
via https. The company provides free security certificates with an
automatic renewal process, and is very easy to set up.
The third row of photos in the header is updated every fifteen minutes. A larger version
may be seen by clicking on any of them.
Email me at "firstname.lastname@example.org" or "email@example.com" any time.
A collection of photographs, including all those referred to in the blog.
There are also galleries of photos for particular topics, such
as various wildlife pictures taken in and around Carleton Place.
A collection of short videos, some from an Akaso trail camera.
This section contains a number of longer articles. Most of them are quite
old, and some need updating.
One day, maybe soon, I will get around to it.
Plots of the current position of the planets and bright stars as seen
from Carleton Place at the current time. The first plot shows the horizon
on the x-axis, with altitude on the y-axis. The second plot shows the same
objects in right ascension and declination. The third plot shows the current
positions of the planets and the moon as viewed from "above" the north pole,
with the orbit sizes
to scale. (There are two separate plots for the inner and outer planets,
as the scale needs to be different).
Charts showing a history of the weather in Ottawa since 2003.
Photos from the series of lunches held for retired (and near-to-retirement) staff
from the Systems Development and Informatics Technology divisions at Statistics
Canada. The group is slowly shrinking, and new members, whether retired
or nearly retired, are very welcome. The lunches are normally held twice
a year, in May and October or November.
The lunches in 2020 and May 2021 were cancelled due to the COVID-19 crisis.
The lunch was held on October 14th 2021 at the Cobrie restaurant in the Carlingwood
Mall (in the same location as the previous Carlingwood Restaurant).
23 members of the group were present.
The lunch was also held at the Cobrie restaurant on May 19th, 2022. About 22 members were present.
The Cobrie restaurant closed. The October 2022 lunch was
held at the Mill Street Brew Pub at 555 Wellington Street (near the
War Museum) on Thursday October 13th, at 11:00 am.
The May 2023 lunch was also held at the Mill Street Brew Pub on May 18th,
at 11:00 am.
The most recent lunch was held on October 26th at the "Big Rig"
at 2750 Iris Street, close to IKEA, at noon.
Bulletins and photographs for the Rotary Club of Carleton Place and Mississippi Mills.
This is an implementation of the algorithm by Drossel and Schwabl to simulate
forest fires. Green cells represent growing trees, and red cells represent trees
on fire. A tree will burn if one or more of its neighbours is burning. Three
parameters can be set:
- Probability of a new tree growing in any cell
- Probability of a tree catching fire spontaneously
- Initial density of the forest (0->1.0)
click on any point to centre the display on that point. You can set
the maximum allowed number of iterations before is is assumed that
the function grows indefinitely. You can also set the scale for the
The larger the number of iterations allowed, the longer the calculation will take.
Status reports for local machines
Europa (Intel i5 quad-core with 20GB)
Ganymede (Thinkcentre Core-2 duo with 8GB)