Ventana software support forum

<snip . . snip> > Am I totally wrong in suggesting - then - that the statement that > something happened at the moment that my calender/clock showed > 13.46 hrs (GMT), september 11th in the year 2001 > is a true instantaneoulsy measured derivative? mr Carolus Grütters Lets see if I can differentiate...

> Ive long suspected that Jay is right and that inductors actually are fundamentally integrators I have never heard Jay say that but then I live 2000 miles away. As stated earlier, the voltage drop across an inductor is proportional to the time rate of change of the current through it - the derivati...

<snip> >I deprecate the plug the numbers into the software and let the magic box work it out approach. >Geoff I totally understand the apprehension for plug and crank. But it does have its place. I would like to relate this through a personal experience. As a new student in electrical engineering, w...

After much work in systems theory, I read JWFs books on industrial dynamics and gained insight into viewing my environment. This has been a basis of much of the work I have done since. As such, I would like to contribute something. I hope the following helps. It doesnt matter whether nature builds d...

Your last scenario will probably perform the best overall. Low amounts of rainfall onto a parched or semi-parched bed will be significantly different from the same rainfall onto an impermeable surface. The evaporation rates are different also between a pure water surface and mud. Raymond T. Joseph, ...

Stocks cant go negative? Dimensions have to be consistent. I have a cylindrical water tank that is 10 meters tall. It is set on ground that is 100 meters below sea level. When the tank is full, the water elevation is -90 meters. I have another cylindrical water tank that is 10 meters tall. It is set...

Niall, It is fun to see others obsessed with systems! Could you please clarify (by example?) your intent of nonlocality? Is this something like one and the same system showing up in two different places at the same time? As opposed to two analogous systems driven by similar inputs. I would also like...

<snip> So Im asking myself the following question: Am I alone (and therefore possibly wrong) in thinking that acausal (ie, instantaneous and mutual) interaction might be a useful modelling tool, or are there really situations out there which also require, at least as a computational assumption, that...

Niall, OK, so lets explore the Ideal Gas Equation: PV = NkT. How can it be unbiasedly represented? How about: G(P,V,T) = 0 where G(P,V,T) = P*V - N*k*T The original equation itself, PV = NkT, is algebraic. As such, it may be used to connect relationships between other variables, or, in other words -...

Geoff, <snip> Point 3 (OK, I lied about two points) is to reiterate my plea NOT to do this sort of work over the public air-waves. Please elaborate on the purpose of a keeping such a study (or any study) from the eyes of the public. I ask this as I am a firm believer that the truth will set you free...

I concur with Nail Palfreyman suggestion that object-oriented modeling and SD have a lot to learn from each other. One of the key lessons is that code should not be jumped into. Any project should undergo a structured analysis. UML can provide such structure (www.uml.org). And it is well suited to t...

Jim, <snip> > that the dynamics of interest will often be caused by one or more feedback loops that cut through a number of sectors. There are numerous ways to present and represent a model. If the model can be presented in such a way that others are able to comprehend the overall connectivity of th...

Heres one for the sectored approach. (I hope I have the same concept of sectored as previously presented.) I have facilitated the development of many large-scale industrial models utilizing many modelers operating in parallel to shorten the overall project duration. There are a few advantages to thi...

Chariya made a very good presentation pointing out that discrete and continuous systems may be architected in a variety of fashions. The ship example can be viewed as the ship being a continuous plant with a continuous controller. The continuous controller uses some of the plants output as its input...

Jim, Yes, this is fun! The colloquial cloud image is intended to describe the electrons wave function. Even at this point, the wave/particle duality has proponents polarized. At one end, the wave function describes the particles probability distribution in space - its actual location being unobserva...

Both modeling architectures may be applicable in either or both domains depending upon the relationships between the components in each system and the operational and simulation time scales of each system. All physical processes are discrete in nature. But this may be down at the atomic level. Aggre...

I have modeled this as follows: There are two systems, the system you can control and the system that you are responding to - the environment. You dont know what the environment is going to do, but you know the general behavior in terms of its dynamics and you have some (statistical) concept of its ...