Electronic Definition and 422 Threads

Hi- We're thinking of purchasing Gaussian 03 for electronic structure calculations. I think the basic license only allows for it to be run on a single processor. Can anyone recommend a decent desktop <1500 dollars that will do a decent job at running electronic-structure? I suspect that...

Homework Statement Can someone please explain to me how to find the voltage across BD in the attached circuit. I can't do these examples. Please help. Homework Equations The Attempt at a Solution When I shorted one source I get the source current as 10.08mA and a voltage drop...

I'm a little confused about something very simple. From a chemistry perspective I am told about how many electrons fit into each type of orbital. For instance, 1s and 2s can only have two each, the 2p orbitals total 6. It is composed of the Px, Py, and Pz and only two can be in each set, while...

Dear users In question i have to find the filter capacitor "C" value i have ripple factor given circut is full wave rectifier circut R(L) is given V(out) of the rectifier is 18V I have calculated the V(peak)(rectified voltage) but in the following formula Vr(Peak to Peak)...

Am I right in assuming that an electronic capacitor and a battery will weigh less when discharged?

hi That's the question. I have done an experiment. The voltage of a free DC power supply was set to 5V. When it was connected to a circuit, its voltage dropped to 3V. What happened? Isn't the 2V is lost in the internal resistance of the power supply. However,the power supply will...

Where can i get credible and good tutorials for electronic engineering online ?

Hey all...HELPPPP! Homework Statement Homework Equations The Attempt at a Solution this one if you have the time.. :D thanks http://img412.imageshack.us/img412/4605/untitled2zz2.png

I want to start a company that design products for the automotive tuner industry. The kind of products that I want to focus on are LED/lighting related controller products. How much money do I need to start this company and can I get away with not having an automated smd placing machine?

The electronic control systems in one power plant are digital base and separated "one point" grounding system is considered for it. In that power plant, the separated hole of electronic grounding is located far from control room, therefore the used cables for suitable interconnection between...

Can someone tell me how the outer shell structure is determined from the electronic structure. I know i can look this up but I'd like to know how it is derived and are there any rules I should follow so i can determine them myself?

ideas for EE design project Me and my partner are currently looking for ideas we can implement in a 10-12 week period. Some ideas we chose from our lecturers list are * car finder - when you can't find your car in the parking lot. * audio delay system - for movies that may have a...

Hey, I will be completing my course in Electronic and Computer Engineering in May of this year. My course has covered a broad range of topics from Analogue Circuit Design to Development of Embedded Systems to Object Orientated Programming in Java and C++. I now have to decide which path to go...

Homework Statement Electrons with the speed v0 move through a constant electronic field E of length L (A two plate conductor) In the electric field the particle have gained a velocity component in y-direction Show that this y-component is: v_y=\frac{e*E*L}{m_e*v_0} Tip...

Let's consider the simple functional group C=O (carbon double bonded to oxygen). There is only one type of vibration for this group and that's the stretching mode, where C<=>O oscillates back and forth. What exactly is happening during the stretching? Are electrons, and therefore electron...

Ok, i am investigating the electronic structure of fullerenes through Near edge x-ray absorption spectroscopy and I really need to know the connection between hybridization theory and LCAO. Everywhere I look it says the carbon atoms in C60 are sp2 hybridized ( sp3 due to angle strain), but as I...

I am finishing up my MS in Biochemistry. I have used a tablet PC for all my classes, but then moved to the smaller OQO for my thesis research work in the lab. Here's a website that discusses the idea of using a tablet PC as a research notebook. [PLAIN]www.e-lab-book.com[/URL]

I am in an electronic circuits laboratory class, and I am looking for a free, easy to use program that will allow me to construct circuit diagrams for my reports. Any ideas? Thx!

I want to build an electronic device that transmits ultrasounds (I guess that is in the LF frequency range [?]). Does anyone know where I can find a kit that creates ultrasounds?

I want to ask which type of the following would have a greater repulsion electrons with parallel spin, electrons with opposite spin. or it's just the same?

Homework Statement Explain why copper(II) is the more common oxidation state than copper (I) by giving the electronic configurations of the ions involved. The Attempt at a Solution i've considered about the configurations of Cu+ and Cu2+ but the result seems to contradict the fact...

Give an overview of the various high current capacity devices applicable in industrial switching and control applications. (symbols,figures and characteristics would be appreciated)

Homework Statement which of the following is isoelectronic with the oxygen ion sulfur ion chlorine ion sodium ion argon Homework Equations The Attempt at a Solution i think the answer is the sulfur ion because it has the same number of valence electrons. is this the...

Am I starting this correctly: (look at pic)

We just consider one dimensional case and the classical method. Then the motion equation of the electron in Coulomb field and the plane wave electronic field is d^2 x/ dt^2=-1/x^2+cos t. (x is the coordinate and t is the time. ) How to solve the equation exactly? We don't consider such cases...

I got this assignment and I am stuck on one question, I just need a few pointers or websites with information. Discuss the effects of altering the gate dimenstions in the MOS devices and the geometry of the bipolar transistors used. I don't need mad calculations or complex answers, just a...

Hi, I'm having a lot of trouble with the following question. Answer: ([SIZE="4"]σ1s)2 ([SIZE="4"]σ*1s)2 ([SIZE="4"]σ2s)2 ([SIZE="4"]σ*2s)2 ([SIZE="4"]π2py)2 ([SIZE="4"]π2pz)1 If anyone can tell me how to obtain this answer, I would be very happy. Thanks.

Titanium 2+ Ion. Is it [Ar]3d^04s^2 or [Ar]3d^24s^0 I'd assume it's the former (looks more energy efficient).

are these correct? i always get confused with the rules for the end of the order: N^3- >> [Ne] Tl^3+ >> [Xe]4f14 3d10 Fe^3+ >> [Ar]3d5

Hi, i was reading through the topic on analogue electronics. And every single example on my text seems to just be just on the negative feedback on both the inverting and non-inverting input of an op-amp. What i would like to know is what's the difference between positive and negative feedback on...

hi, I am beginning study electronic structure and I do not understand formely what is a band, what mean the lines that appear when a band structure calculation is made?, where are the bands?. thanks

hello everybody my ques about the fuel injector,which is working electronically-- i saw it for real in a car was fixing by a mechanic,and i looked at the electronic fuel injectors mounted on the fuel rail----and while the engine was running,the injector as u know-is supplied by the pressurized...

Dumb question...but I don't know the answer. Is there a way to determine if a piece of metal will cause electronic interference? Is it true only for ferric metals, or can any type of metal cause transmission problems? Cya later, alligator

I am the Lighting Designer for a production of 'As You Like It' and have been asked to find a way to create a realistic firefly effect. From my research, Fireflys have a dominant wavelength of 570 nanometers. They fade on quickly, pulse (a very fast fade on and off) at a rate between 2.5 and...

Q1. A 10,000 Micro Farad capacitor has an asymmetric tolerance specification of +20%/-50% What is the possible range of values for this capacitor? How do I do this problem ? Q2. A 15-bit A/D converter has V(full scale) = 10 V. what is the value of the LSB> If the input voltage is 6.83 V...

I ony know how to explain the anomality of Cr and Cu's electronic configurations. And in the assignments, I am asked the following: (a) For Rh: Why not [Kr]4d7 5s2 but [Kr] 4d8 5s1 (b) For Ir: Why not [Xe]4f14 5d8 6s1 but [Xe] 4f14 5d7 6s2 Can someone give a brief explanation...

I wanted to get information about how to design an electronic nose.How to get started, how to get concepts related to it.Can anyone help me?

I NEED A [SIZE="3"]DATASHEET OR LIST OF ABOUT [SIZE="3"]50 EACH OF [SIZE="3"]RESISTANCES, DIODES, CAPACITORS, ZENER DIODES AND ICs WITH S[SIZE="3"]PECIFICATIONS LIKE VOLTAGE, CURRENT AND POWER RATING, COMMONLY USED IN ELECTRONICS LABORATORY OF COLLEGE LEVEL I NEED IT [SIZE="3"]URGENTLY WITHIN...

I want to use a 50-pin cable to ignite e-matches connected to fireworks. The e-matches require about 1 Amp to ignite. The individual conducting wires in the cable are obviously very thin, and thus can't conduct a continuous 1 Amp current. My question though is this: can the very thin conducting...

hi can anyone please help me I came across this statement "Since we only consider the electronic ground state of the system, there can be no net force or torque acting upon the subsystem of classically behaving nuclei". Can anyone explain what this means?

Ok magnetoes are fine buit expensive to keep in A1 condition, so i want to convert to electronic, i have the means to manufacture the body to hold the new mechanism, and guess i can tailor it to fit some prop trigger mechanism for the LT, the problem is a control for maping the required...

Hi, I was wondering, if the Schroedinger equation implies a continuous evolution of the state vector, then how does Bohr's theory of electron's discontinuous jumps between energy states fit in? Conversely, if an electron 'jumps' from one state to another with nothing intermediate, then how...

My electronic class is almost over, <thank god>. Unfortunately, I have what I call a "barnes n' noble" book. You know when you walk into barnes n noble and you go to the science section and you see a bunch of math/physics/engineering books. You always pick one up to see what's inside, but you...

3 x 15Ohm resistor (R) and 3 x 3.83 mH reactors (L) are connected in different ways across a 500V, 3 phase line. without drawing a phasor diagram, calculate the line current for each of the following connections: a. R and L in series, connected in wye b. R and L in parallel, connected in...

I was debating on another forum about EM Pulse (yes, I just watched War of the World :-p ). Anyway, does anyone know exactly what electrical components will be damaged by an EMP? I know silicon chips would be dead, but what about capactors, diodes, resistors, etc. Also, if a cars...

Hello everybody,I am from China,and I majored in mechanic and electronic in a college. now I want to devotee myself to physic. Anybody experienced,do you think it is possible and wish you some advice. Thanks for reply,my e-mail is daifeili@163.com:smile:

http://up4.w6w.net/upload/17-03-2006/w6w_2006031704465627806cb7.JPG for the following circuit find and draw V(out) if the V(in) signal is a sine wave with amplitude of 10V (Consider all diodes to be ideal) This is the problem , could anyone please solve it 4 me ?:?: 10x

[invalid link removed, see next post] Contains links to video lectures, tutorials, books, and a few projects.

is it true that electoronical device are still alive even when they are off? if yes why?

It's a well known fact from Quantum Mechanics that electrons exist in fixed, quantised energy states. Also, when they move from one energy level to another, they emit or absorb the energy as required by \triangle E . Also, if a particular photon is absorbed , the apprpriate transition takes...