Mode Definition and 324 Threads

Hi, I have a 2nd order of sliding mode observer of the form: \dot{\hat{x}} = \hat{f}(x,t) + \delta f + \Psi(u,y) +[ \frac{d \Omega}{dx}]^{-1} \upsilon where ##\upsilon##: \upsilon_1= \alpha_1 \lambda_1^{1/2} | y_1 -\hat{x}_1|^{1/2}*sign(y_1 -\hat{x}_1) \upsilon_2= \alpha_2...

Homework Statement Does this mean that the forward bias p-n junction starts behaving as a conductor at very small input voltage i.e. of the order of 50 mV and it decreases as VCB increases? The two circuits i.e. forward bias circuit and reverse bias circuit are independent. Then why should...

Hi, I have designed a variable-based observer analytically on paper. Now it's time to implement it in Simulink/matlab. Suppose we have followings in a tire model. The EOM says: J\dot{\omega} = T-R_eF_x m\dot{v}_x = F_x where J is the inertia of the wheel, \omega is the angular velocity , m is...

http://www.independent.co.uk/news/science/angel-particle-anti-matter-quantum-physics-discover-stanford-university-california-irvine-a7851661.html

Hello there, I was wondering if the power profile of a single mode waveguide can be changed? I mean, a wave that travels through the waveguide will have a harmonic shape, right? Is it possible to get a different shape of the power profile? Thank you :)

I was going through MIT opencourseware https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-013-electromagnetics-and-applications-spring-2009/readings/MIT6_013S09_chap07.pdf and I didnt understand exactly why in equation 7.1.37 and 7.1.38 in page 192 the divergence of...

I have a 3x3.5 (meters) room with a bathroom of approximately 1.5 x 2. I want to know whether to close the door or not, If I running Fan Mode. There is wall in front of my door, about 60 cm, My assumption: Fan mode only circulate the air, If I open the door, I'll bring outside air in, which is...

Hi,I have been reading a text on "Finite Element model updating". This question is not related to the subject of "Finite Element Model Updating" but rather to the subject of "Structural Dynamics" and experimental modal analysis. My questions is: 1)Let us say I have carried out a free...

Homework Statement Vtn = 0.4V NMOS1 Drain = 2.5V Gate = 1.9V Source = 0V NMOS2 Drain = 0.5V Gate = 2.2V Source = -2.3V NMOS3 Drain = 0.5V Gate = 0.9V Source = -2.5V Homework EquationsThe Attempt at a Solution NMOS1 Vgs = Vg - Vs = 1.9V Vgd = Vg - Vd = -0.6V Vgd < Vtn and Vgs > Vtn...

I am working on a switch mode psu in step down configuration with the key components being: LM2592 (adj) http://www.ti.com/lit/ds/symlink/lm2592hv.pdf 530-PC-24-1000 http://www.mouser.com/ds/2/643/PC-594199.pdf GSIB-25 http://www.vishay.com/docs/88646/gsib25xx.pdf Using a slightly modified...

Dear experts, I´m performing a non-linear buckling analysis under ANSYS Mechanical APDL (v14.5) using an input file that processes the last converged step to generate some etable output. When run in GUI everything goes fine: the non-linear buckling analysis is performed until it becomes...

I want to determine the natural frequencies and the mode shapes of the given mechanism ( it consists of 2 inclined beams connected together by a compliant link, the bottom end is fixed and the upper end is a roller support). I have done Finite element modeling but I need to get some analytical...

I showed beta decay in decay mode of Nuclear chart..but I couldn't find what is the meaning if IT 100%..

In a digital communication channel, assume that the number of bits received in error can be modeled by a binomial random variable, and assumed that a bit is received in error is 1×〖10〗^(−5) . if 16 million bits are transmitted, What is the probability that more than 150 errors occur? Find the...

when a longitudinal wave beam hits the interface at an oblique angle, we can have both refracted longitudinal and transverse waves, so as with reflected.that's because some of longitudinal waves have converted to transverse waves.but why is that? what is the origin? p/s: sorry for bad English :(

I don't understand the difference between the Jeans Mass and the fundamental mode. Both are reaching till the horizon but according to me is the Jeans mass not oscillating. So what is the relation between a Jeans mass and the fundamental mode of the acoustic waves?

Hello, I want to convert gas unit into oven temperature (Fahrenheit, Celsius). Which formula I can use? Also I want to know at which oven temperature we can assume it as moderately high or cool temperature??

Hi, Say you have a two conductor transmission line in TEM mode. The E and B field's will look something like the picture below with the E field in blue and the B field in red. The E field should point in the direction of the current, as it's what makes the charges move. The E field in the...

In making cosmological measurements, we are limited to the region within the particle horizon, the 'observable universe'. However, it is reasonable to assume that even if the universe is finite, it is much larger than that volume. If, for example, we measure the curvature ##\Omega_K##, the value...

What is modal analysis and what are mode shapes. Plz explain along with a real life problem for better understanding

In physics, wave mechanics and vibration specifically, do the terms note, tone and mode mean the same thing or do they refer to difference things? Also what does the mode of oscillation exactly mean?

for example 100,539/2 in mod 1,000,007. is there a systematic procedure to calculate this ??

In the canonical quantisation of a free scalar field ##\phi## one typical constructs a mode expansion of the corresponding field operator ##\hat{\phi}## as a solution to the Klein-Gordon equation...

Hi, I'm new to this forum and I couldn't find any specific sub-forum for fiber optics/waveguide theory, which my problem is regarding. Please do let me know if I should post this question some where else (and if so, where) on this forum. Anyways, here's my problem: I want to find the effective...

I read a line in the book "Quantum physics of atoms, molecules, solids, nuclei, and particles" by resnick The line is "in classical physics energy is either Transported by waves or by particles" I have doubt is it correct, like we say eneegy is stored in electric field, is electric field...

Dear PF Forum, What does "Protected mode" means in x86 architecture? I try to understand this, but failed. This is the "Protected Mode" advantages from http://prodebug.sourceforge.net/pmtut.html#Advantages that I read: - Access to 4 gigabytes of memory - Virtual memory - Address translation -...

Hi all, I was trying to get into safe mode in Windows Vista (2007 version) to disable some malware that had installed itself through the web. The standard instructions -- restart and press F8 just before the computer starts up seems to not work. I have heard that newer editions of Windows...

It had to happen eventually. The world's first fatality while a car was driving itself. Self-Driving Tesla Was Involved in Fatal Crash If the car can't see a semi turning in front of it, you have to wonder if it can see a motorcycle or even other cars.

Hey guys so I just came across visual studio 2015 to program some real time voltage chart. I don't have enough knowledge of this software as I have been working with visual basic 6 before until I had to let it go for good. The issue is I cant´see the chart I'm creating I'm using the default...

So I am looking to possibly use a ring transducer that has a hoop vibration mode to power a sonoluminescence experiment I am doing for school. I am attaching a picture of the set-up I have now and the aluminum disc in the picture is where I will epoxy the transducer so it can send sound waves...

Hi, I have this question. An instrumentation measuring system uses a differential amplifier having a CMRR of 120 dB and differential gain of 105. The maximum differential input signal is 60 μV. If the amplified noise voltage is specified to be not more than 1% of the maximum output voltage...

Homework Statement Consider the following example from a previous exam. We are to predict the spin and parity for F(A=17,Z=9), Florine, in the ground state and the first two excited states using the shell model. Ground state: Neutrons: (1s 1/2)^2 (1p 3/2)^4 (1p 1/2)^2 Protons: (1s 1/2)^2...

I'm learning about multi-axial mode lasers. From what I understand, a multi-axial mode laser has more modes with which it can amplify light at. I'm trying to understand: 1) What are the advantages and disadvantages of a multi-axial mode laser? 2) What applications do this lasers have?

Hi, For a SoC project I am working on I need to select one cell which is most critical. example, If a bus is going through 1000 stops 1000 times I have mean median mode of delay contribution of that stop compared to the total delay to reach from start to stop point and N (number of times bus...

Homework Statement Hi! I learned how to work with transistors a long time ago. However, it is good to fortify youre knowledge. I was checking a circuit board for issues and found a npn bjt, which Colector-emitter resistance while in cutoff mode, is arround 1k ohms. So my knowledge of bjt's says...

Just noticed the Kepler telescope is running in "safe mode" burning precious fuel very quickly. Could be the end of the show for K-2 if they don't come up with a workaround soon. If anyone hears of progress regarding the problem could they please mention it here? Thanks:smile...

Hi, I want to operate my transistor as a switch. I am using this one Datasheet: http://www.farnell.com/datasheets/1868820.pdf In the data sheet, it says the DC current gain hfe = 110 which I am assuming that's for the linear operating region ?, so if my hfe is less than 110 then will it be in...

This is a really silly/very basic question but I'm having trouble finding a clear, concise definition of a "mode of vibration"; assuming the same object that is vibrating is being discussed each time, are the only things characterizing a mode of vibration the waveform, the frequency of the mode...

I am looking into different methods of power supply's when I found out about switch mode power supply's. These are the type of supply's that you have in your phone charger (or at least i believe so). The type of supply I need, is something that can supply a voltage of 2.5 volts @ 70 amps, and...

In flights during landoff or takeoff they say to keep the phone in flight mode and then switch off so as to not interfere with the aircraft signals. But why should we switch off if keeping the phone in flight mode? Flight mode disables cellular and wifi networks.

Hey, I have a question about waves. Why is it that the energy of a wave depends only on the frequency but not on the wavelength? Shouldn't two waves that have the same frequency but different wavelengths also have a different energy? If not there should be some other quantitiy with which one can...

In the recent android version which is Lollipop the feature of palm showing to mobile to take a selfie after 2 seconds has been removed or I am not able to spot it clearly? There is also a space left in between camera reversal and some beauty thing. Earlier that was there in Kitkat version. Why...

Homework Statement Hi guys (first post here let me know if I can fix anything that I've done wrong), I'm struggling a little with the second part of this question and seem to be going round in circles A column has the dimensions shown in the diagram below. (a) What is the minimum length of...

1) When a FET is completely on, the voltage drop across the drain-source is ideally 0. This means that when completely on, V_{ds}<V_{gs}. Why doesn't the FET go into ohmic/triode mode when V_{ds} dips below V_{gs} ? 2) Why are we measuring these voltages relative to the source (for a standard...

Hello Peeps~ I have couple of questions related to vibration and I would really appreciate some help from you experts out there. Anyways, say I have a metal plate with mode shapes observed at 100 Hz and 300 Hz as shown in the below figures. If I were to chip(cut) off a small part of the...

I had a student calculate ##\tan\left(\frac{5\pi}{6}\right)## on a TI-84 calculator and he had a rounding error in the 6th or 7th decimal place. This isn't really a big deal, but he asked and we quickly found out it was because he was in fraction display mode. I don't know too much about...

Hello, There's a mystery in my laptop, that makes it hibernate after it's been on for awhile. I've turned off auto-hibernate/suspension in the power settings already, so this is really puzzling to me why this is happening. I want to leave the computer on during the night to do some long...

I'm upgrading a non-PFC (power factor corrected) offline power supply design to include PFC for European deployment. The total output power is less than 25W, and the two output windings are around 20V. I'm familiar with boost-flyback topologies for isolated PFC supplies, but that seems to...

http://ir.hfcas.ac.cn/bitstream/334002/12022/1/Mode%20converters%20for%20generating%20the%20HE%2011%20%28gaussian%20like%29%20mode%20from%20TE%2001%20in%20a%20circular%20waveguide.pdf In the above article, the mode coupling theory shows how a bended circular waveguide transforms a TE01 mode...

what is addressing mode? and what is the meaning of these following statements BYTE_VALUE DB 150; A byte value is defined WORD_VALUE DW 300; A word value is defined ADD BYTE_VALUE,65;An immediate operand 65is added MOV AX,45H what is 45h?