search for: dpdt

Hello there, Suppose you want to solve the following system of ODE's (a simple Lotka-Volterra predator prey model) dP/dt = beta*P*V - mu*P dV/dt = r*V - beta*P*V where P and V are the numbers of predators and prey. Now, this is easy to do, but suppose you have a system of equations like this, dP1/dt = beta1*P1*V1 - mu1*P1 dP2/dt = beta2*P2*V2 - mu2*P2 dV1/dt = r1*V1 - beta1*P1*V1

Thanks, Charles. I pulled your change and it fixed my segmentation fault. I discovered the following code at line 571 in usbhid-ups.c. This is part of the "checking for alternatives" code: if (!strcasecmp(cmdname, "shutdown.return")) { int ret; /* Ensure "ups.start.auto" is set to "yes", if supported */ if

...easier to test NUT and my UPS. My problem is that for testing I don't want my system plugged into my UPS, so I can test UPS operations without shutting down my system. But the rest of the time, I want to be protected against power problems. My solution was to build a transfer switch (just a DPDT switch in a box) that enables me to switch my system between wall power and UPS power. Thus I can connect the system to the wall, shut down the UPS for testing, and connect my system back to the UPS when I'm done, all without any system shutdowns. Ken

Hi. I have a client who wants some way that his analog phones can call out even after the power is out and the UPS has died -- some way that a phone can connect directly to an fxo or some such when power is gone. Any hardware around which can do this? I have heard of some ATA's which do this, do any of the channel banks have this capability? Thanks. -- Your life is like a penny.

Hi, I am supportive of the asterisk, but I have some concern, though the concern also applies to traditional pbx as well. Hope someone can shine some light into it. Thanks. During a power failure situation, analog pstn lines that connect directly to the analog phones will most likely still be able to make and receive calls. However, for the Asterisk implementation, unless you have a

Hello, I am trying to solve a problem that I can foresee when I deploy Asterisk into a few SOHO situations soon. In Nebraska and in my area of Western Pennsylvania we have violent thunderstorms in spring and summer and sometimes very heavy wet snow in Winter. Both type of event will take out the power of a period of 30sec to 36-hours. So no UPS system would be able to handle a system for over