Recent content by jsgruszynski

I think "Design Right" may be the equivalent of "Trade Dress" in the US.

There are some specific areas that are strongly influential to systems as a science include: Graph Theory Network Theory Statistics and Probability Stochastic Systems Chaos Theory Complexity Theory Control Systems Theory Statistical Mechanics Quantum Theory Information Theory Ultimately we...

Well, you still need a carbon source because plastics are carbon-based. And presumably you'd need an "end of life cycle" plan as well if "carbon removal" is your ideological goal. This feedstock issue probably still REQUIRES fossil fuels. Ultimately you still need energy to do ANY...

When the virus is highly lethal, yes - because it's "kills the golden goose" of a viable host population to quickly and too effectively. So those mutations that survive will tend to "let the host have a chance" by favoring less lethal alleles because that preserves reproductive options at all...

Worry about what you can change; ignore what you can NOT change. Otherwise you will drive yourself crazy. I happen to work for a Taiwanese company. You've probably read that "China eyes Ukraine as example for invasion of Taiwan" or similar. I can't control what China does or does not do so...

Right-hand rule is your friend - specifically closed fist version - current in the direction of your thumb creates a magnetic field that wraps as the rest of your fingers. Induction is reciprocal and exactly the same. I have found and humorous memories of both EE and Physics classes during...

It affects it by simply circuit analysis. The hard part is knowing what the transistor "input impedance" is. Typically there are memorized once you learn them - for a bipolar base input from a Hybrid pi model it's Rb + (Rpi + Re) * (Beta + 1). A common range of values is 1K-10K in practice...

Be aware that a frequency mixer is a Large Signal "device". Small Signal analysis in SPICE (.AC) will NOT give you the right answer. Specifically diode mixers (or any other type) will not "mix" without large signal, NONLINEAR excursions of the diodes. This is central to how any mixer...

Predicting earthquakes falls into the same physical problem as as predicting failures and lifetimes of engineered "things". Basically you have to collect a lot of empirical data, crunch it just right with the correct associated data such as time of historic failure, and then all you can ever...

However such simulation are still highly susceptible to "garbage-in-garbage-out" - can you actually determine the REQUIRED initial conditions and boundary conditions for the simulation to have any fidelity. This is a problem for Navier-Stokes (differential equations for fluid dynamics used in...

The technique does work. I've had it done many times. The impact on the belts is pretty small: calculate the area of any given belt and then the area the puncture and patch - it's going to be between 1000:1 or 10,000:1 in area ratio depending on the tire size. For engineering purposes that...

This is where understanding a "frequency domain" view of signals can be helpful. A sine wave that is chopped off per a full or half-wave rectifier has had some of the sine wave energy converting into frequencies at DC and at frequencies above the original AC frequency. You want the DC but...

There's no such simple generalization. Multiple locations within a MOSFET have specific and carefully chosen doping levels. There isn't one. For example, drain-source breakdown voltage depends on the breakdown of the drain-channel diode. Increasing the doping of the channel as well as...

The key factor with distributed model (s-parameters, transmission lines, etc.) is that the wavelength is pretty close to physical dimensions. Rather than "analogy" it's a "subset" relationship like that between Newtonian vs. Relativity physics - one is a proper subset model where the subset...

It's for tuning the antenna to its resonance.