At the link below you can find some excellent video from a member of The Deco Stop forum.
http://thedecostop.com/forums/showpost.php?p=305446&postcount=1
or the direct link to his collection
http://www.stajniakleina.pl/stajnia/video.htm
The files are big so be patient when loading.
Tuesday, May 15, 2007
Friday, May 4, 2007
Back to "work" so... Let's talk about Dive-data collection
The May holidays are finished so I am back to "work". In past days I spend some time with my family - they definitely earned it. I hope they enjoyed as much as I have.
As at school we are talking about databases and we have to construct a sample database, I decided to create a Dive Log database.
This data collection (about the dives) is used to facilitate finding reasons for dive injuries, same as for dive planning and other statistical evaluations. Scientists use the data to create newer better decompression algorithms and other tools for divers. Especially the post-dive data and profile-data are used in scientists work judging the decompression algorithms. Number of post dive problems, bends, repeatability of this cases makes the evaluation of the algorithm possible. Less symptoms and bends or other cases after the dive better the algorithm is.
As at school we are talking about databases and we have to construct a sample database, I decided to create a Dive Log database.
This data collection (about the dives) is used to facilitate finding reasons for dive injuries, same as for dive planning and other statistical evaluations. Scientists use the data to create newer better decompression algorithms and other tools for divers. Especially the post-dive data and profile-data are used in scientists work judging the decompression algorithms. Number of post dive problems, bends, repeatability of this cases makes the evaluation of the algorithm possible. Less symptoms and bends or other cases after the dive better the algorithm is.
So, the data collected through this kind of Dive Log databases can be very useful. The main thing that should be kept in mind is to enter every dive and the appropriate data in the Dive Log and periodically send the data to DAN. DAN is an international organisation working on safety of divers providing diving insurance and organising different research projects. Most of the research projects are about decompression sickness and diving related injuries, some about the diving equipment and other diving topics.
Back to school - the Dive Log database.
What are the Data about the dive that need to be collected? Definitely we need to know:
DATA ABOUT THE DIVE:
current number of the dive,
date of the dive,
was the dive repetitive dive -if yes than the number of the dive in series,
surface interval past previous dive,
the time dive started,
duration of the dive,
max depth reached,
type of the dive - cave, wrack, technical, recreational...,
level of the dive - easy, difficult, demanding,..,
profile of the dive (run time, depth, temperature),
conditions on the dive (weather, temperature of the water, UW visibility).
DATA ABOUT THE PLACE OF THE DIVE:
country where the dive was made,
city or place name,
location name.
DATA ABOUT THE EQUIPMENT:
type of the equipment,
name of the equipment,
number of pieces of the equipment used.
DATA ABOUT PERSONS ON THE DIVE:
divers name and surname,
type of the diver (dive master or buddy),
qualification (organisation and level).
DIVE ORGANIZER:
name of DC if the dive is organized by a Dive Center,
name of Diving Club if the dive is organized by a Dive Club,
or definition of a private dive.
POST DIVE DATA:
data on how divers felt after the dive (tired, good, minor skin bends, no troubles...).
DATA ABOUT THE DIVE:
current number of the dive,
date of the dive,
was the dive repetitive dive -if yes than the number of the dive in series,
surface interval past previous dive,
the time dive started,
duration of the dive,
max depth reached,
type of the dive - cave, wrack, technical, recreational...,
level of the dive - easy, difficult, demanding,..,
profile of the dive (run time, depth, temperature),
conditions on the dive (weather, temperature of the water, UW visibility).
DATA ABOUT THE PLACE OF THE DIVE:
country where the dive was made,
city or place name,
location name.
DATA ABOUT THE EQUIPMENT:
type of the equipment,
name of the equipment,
number of pieces of the equipment used.
DATA ABOUT PERSONS ON THE DIVE:
divers name and surname,
type of the diver (dive master or buddy),
qualification (organisation and level).
DIVE ORGANIZER:
name of DC if the dive is organized by a Dive Center,
name of Diving Club if the dive is organized by a Dive Club,
or definition of a private dive.
POST DIVE DATA:
data on how divers felt after the dive (tired, good, minor skin bends, no troubles...).
And than, there are connections between all this data that have to be established......
But about all this we will talk in next article, where we will talk about the Dive Log and it's construction.
Tuesday, April 24, 2007
Little tool for divers named "PP Mixer"
Lately, I did not write here a lot as I was occupied with other things.
One was a sort of manual or better instructions on how to use software I compiled for Pocket PC devices. Its name is PP Mixer. The name derives from Partial Pressure for PP and Mixer from mixing gasses to get homogeneous mixture ready for breathing under water. The software I compiled is taking in account temperature and compressibility of gasses. When talking about this two factors being included in calculations, we talk about real gas computation. The formula used for real gas computation in PP Mixer is Beattie-Bridgman equation of state.
One was a sort of manual or better instructions on how to use software I compiled for Pocket PC devices. Its name is PP Mixer. The name derives from Partial Pressure for PP and Mixer from mixing gasses to get homogeneous mixture ready for breathing under water. The software I compiled is taking in account temperature and compressibility of gasses. When talking about this two factors being included in calculations, we talk about real gas computation. The formula used for real gas computation in PP Mixer is Beattie-Bridgman equation of state.
The program can be downloaded at my modest website Divers SI where the short instructions (still not completely finished) on use of the program are available.
It was quite of a challenge for me to compile the "PP Mixer" as when starting, I did not know anything about real gas computation. Slowly I learned about the gas constants, Kelvin degrees of temperature, relations between ATA, Bar, PSI and other pressure units, Van Der Walls computation of state and others. Finally today I can say I managed to put together a useful tool for technical oriented divers which are mixing - blending their gases themselves.
The program is available as a freeware for everyone.
The tools I used to compile the program are a set of tools called eMbedded Visual Tools 3.0 - 2002 Edition and the specific tool I used is eMbedded Visual Basic 3.0.
Friday, April 20, 2007
Proteus anguinus (Human Fish)
In the link below you can find some information about the Proteus anguinus.
Its common name, used most, is Human fish, that would be in Slovenian language Človeška ribica.
http://camp.rrc-kp.si/praksa/proteus/index_en.htmrrc-kp.si/praksa/proteus/index_en.htm
Thursday, April 19, 2007
Why do I like diving?
There are many things a person can do. Play an instrument,walk mountains, ride a bicycle....
But I choose diving, why?
If I'm honest I don't know...
But I choose diving, why?
If I'm honest I don't know...
It was a case that I needed some sort of distraction when building the house for my family.
I'm a person used to do lot of things myself, so I was all the time around the growing building.
One day I spoke with one of my friends who invited me to a course they were organizing at the DPD Soča diving club. I joined the course, passed exam and did some dives around Piran.
Years passing I became fascinated with the silence under water. The physics of gasses became one of my primary interests so I started to participate in diving forums. There I meet divers from around the world and learned a lot from them. Reading things about caves, wracks and mixed gas diving I became interested in decompression modeling. In the mean time I participated in Technical diving courses like IANTD Nitrox and Advanced Nitrox diver course,
ANDI Extended range and Trimix diver course. And finally two years ago started with cave oriented courses with the NACD cavern diver course.
The thing I like most about diving is .... when I'm down there, I hear just my breath, the sound of bubbles rising to the surface ..... see sea life around ..... slow movements .....
I can see places and creatures just few people can see, exploring unseen places ... like caves ...
It is fascinating to see Proteus in our Karst caves ......
So, this being my primary hobby and point of interest, I will try to write here about diving, physics of diving and diving equipment. I hope I can manage to post here reports about my diving projects to.
Soooooo..... if there is any question anyone has ..... just post it here and I will do my best to get answers to you.....
Tuesday, April 17, 2007
The biggest mediteranean wrack Amoco Milford Haven
Here you can read everything about the supertanker,
it's disaster, post-disaster works on the ship ....
it's disaster, post-disaster works on the ship ....
.
edited 22. 4. 2007
added links:
added links:
and one in Italian language:
Monday, April 16, 2007
About me
Hi everyone!
I'm Slovenian, 43 years old, studying informatics ....interested in diving....
I'm a technical diver especially interested in decompression modeling and diving related software design.
I dive wracks, caves ...anywhere possible..... And no I'm not a fanatic.
Last September I joined vocational college for informatics at TSC. The reason was simple, not knowing enough about programming, I wanted to learn basic principles that are used by professionals.
In my past I wrote some programs used by divers around the world. Those are just small tools which can help in limited way. At the same time I helped other programmers beta-test two most known deco-planning programs GAP-Lite and V-Planner.
Now I decided to develop a deco-planning tool using the most advanced decompression models known until today myself and incorporate all knowledge on diving I accumulated during past years. In the same time I'm working on implementation of one of the decompression algorithms in wrist mounted computer, which should do live calculations of tissue status and deco-stops needed to safely return to surface.
I hope I will reach my goal and successfully release the program in two years. This meas finished tools, tested till the level that no significant mistakes are produced. Safe enough for me to use and remain alive.
Igor P
I'm Slovenian, 43 years old, studying informatics ....interested in diving....
I'm a technical diver especially interested in decompression modeling and diving related software design.
I dive wracks, caves ...anywhere possible..... And no I'm not a fanatic.
Last September I joined vocational college for informatics at TSC. The reason was simple, not knowing enough about programming, I wanted to learn basic principles that are used by professionals.
In my past I wrote some programs used by divers around the world. Those are just small tools which can help in limited way. At the same time I helped other programmers beta-test two most known deco-planning programs GAP-Lite and V-Planner.
Now I decided to develop a deco-planning tool using the most advanced decompression models known until today myself and incorporate all knowledge on diving I accumulated during past years. In the same time I'm working on implementation of one of the decompression algorithms in wrist mounted computer, which should do live calculations of tissue status and deco-stops needed to safely return to surface.
I hope I will reach my goal and successfully release the program in two years. This meas finished tools, tested till the level that no significant mistakes are produced. Safe enough for me to use and remain alive.
Igor P
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