Sensitivity Definition and 111 Threads

The color coordinates of displays for portable electronics such as laptop computers generally provide smaller color spaces than for television. Battery power is a critical limitation on the light sources used for the display and maximum display brightness is desired. Explain why a reduction in...

How sensitive are animals, specifically humans, to changes in gravity that influence their body? I am not talking about changes that a human would feel in a variable centrifuge. The thought experiment would be: 1. A person is sat on a chair or reclined on a sofa. 2. Adjacent is a...

Greetings fellow members, I have some queries on a laughably rudimental topic regarding measurements. Say you have a metre rule with sensitivity of 0.1cm, and you are measuring a wire which stretches from the 0.0cm starting point to the middle point between 7.3 cm and 7.4cm. My...

The balloon-borne EBEX microwave background mapper was let fly today. Andrew Jaffe's blog has a video of the launch, down in the Antarctic. video made by Aboobaker: http://www.youtube.com/watch?v=f-_2ESkCf94&...

with s being the sensitivity of a transfer function GC/(1+GC) to the parameter G. (1/(1+GC) I see mathematically how it works out. My question is about the profoundness of the statement. Qualitatively, what does it mean

Homework Statement Let f(x) = x^{n} - ax^{n-1},\: and \: set\: g(x) = x^{n} \\ (a) \: Use\, the\, Sensitivity\, Formula\, to\, give\, a\, prediction\, for\, the\, nonzero\, \\ root \, of\,\; f_{\epsilon }(x) = x^{n} -ax^{n-1} + \epsilon x^{n} \, for\,small\,\epsilon.\\ \\ (b) \...

So I've been looking at magnetic sensor datasheets and I see the sensitivity is usually listed in units of mV/V/gauss. What does this mean? Let's say I need to sense changes in a magnetic field that usually ranges from about 10 gauss ( 1 mT ) to about 130 gauss ( 13 mT ). And I need to be able...

Three substances of nickel, chromium and cobalt, lead to dermatitis ratio accounted for 25 substances, the first, third and fourth place. Does anyone have any suggestions on what kind of reactions between metal and sensitivity skin? Thanks in advance for any suggestions

I'm struggling to understand what makes the wheatstone bridge such a good circuit for measuring small resistances. Essentially the bridge is just two voltage dividers and the output voltage is the difference between the two dividers. Ok so the only advantage I can see over a conventional...

I don't know if i understood very well what does voltmetre sensitivity mean. So, if a have a voltmetre with the sensitivity 40kohm/V and his U( in scale) is 10 V, the voltmetre internal resistance is 400kohm?

My book defines accuracy as the closeness of a measurement to the real/actual value, precision as when a set of values are consistent with each other (i.e. close to each other) and sensitivity as the smallest possible reading of an instrument (i.e. to how many decimal places it can measure)...

Problem: I'm trying to optimize an inexpensive digital camera with a CCD sensor for NIR video. As of right now (after removing the IR filter) it doesn't work well in the dark at all (even with a basic visible light filter ... obviously). I have to direct at least a little bit of regular light...

1. Function, F is dependent on variable a; and the sensitivity is S = \frac{\frac{\delta{F}}{F}}{\frac{\delta{a}}{a}} 2. My question is what if F is a function of two variable, a and b? In that case what would be the sensitivity equation? Is it something like: S =...

Homework Statement Consider the population model with dx/dt=rx(1-x)-ax/(1+x). Compute the normalized forward sensitivity indices of the (positive) internal equilibrium with respect to r and a. The default parameter values are r=4, a=3.Homework Equations SI(x,t)=(∂x/∂t)*(t/u)The Attempt at a...

Homework Statement Imagine we are observing the motion of frictionless, elastically colliding billiard balls. Using sensible assumptions about the size of things, show that, if someone enters the room, small deflections of the balls due this visitor's gravitational pull will completely...

Homework Statement The attempt at a solution First, we define sensitivity as the change of an instrument or transducer's output per unit change in the measured quantity. So to find the minimum sensitivity I simply plugged in the largest possible input (5.0 mm) into the equation: E =...

I'm trying to figure out the sensitivity of the Fermi LAT, in units of spectral flux---e.g. Jansky, or a limiting magnitude which could easily be converted. I've only found sensitivity in traditional high-energy terms, e.g: 4\times10^{-6} \textrm{ photons/s/cm}^2 for photons above 100 MeV, with...

Hi guys, this is to make something for a uni project I'm doing, not asking for the answers to a homework-type problem so I wasn't sure if it should go in the homework section, but if you think it should let me know and I will move it. So the project background is a timing system for solar...

Hello everyone, I am trying to simulate an OFDM system and part of what I want to do is investigate the Bit Error Rate with respect to frequency offset. I understand how the offset vs BER curve should be looking like the curve obtained in the code in this link...

What is the unit of sensitivity of a seismometer? What is V/(m/sec)? How can we compare this value to the Richter-scale? What is the order of magnitude of the seismic background?

This might more properly belong in the Biology section, but I figure that it might involve other factors. There's something that I've been observing for decades, but never actually noticed until last week when watching an Extreme Close-Up shot in a movie. Can anyone explain why an actor's...

Hello frnds! Nice to meet you all here. Can anybody help me in understanding the exact differences between responsivity and sessitivity of a photodiode or photodetector?

Homework Statement The auditory canal of the human ear extends about 2.5 cm from the outside ear to the eardrum (a)Explain why the human ear is especially sensitive to sounds at frequencies around 3500Hz. Homework Equations Speed of sound v=344m/s The Attempt at a Solution I know...

What is the relation between sensitivity and Q-factor ? of a resonant RLC circuit in some books it is given Sensitivity = Q in some other books it is given Sensitivity = 1/Q

Homework Statement a galvanometer with 50 divisions on the scale requires a current sensitivity of 0.1 m A/division. find the galvanometer current? Homework Equations IS= \theta/I TO find the galvanometer current, i multiplied 50 with 0.1 to get the galvanometer current, as instructed...

I'm reading an article about glucose dynamics and there were two terms I wasn't sure about. I'm guessing insulin sensitivity is how much glucose is absorbed by a certain amount of insulin, but what is glucose effectiveness? Any help is appreciated.

I am developing a new chemical sensor. I want to test the sensitivity of the sensor to various chemicals such as K3Fe(CN)6 and Ascorbic Acid. My understanding was that you could use a chronoamperometry scan to do this measurement by injecting a controlled amount of chemical every 60 seconds...

Understandably so, certain isotopic separation techniques are going to be sensitive (U-235, U-233, Li-6) because of their relationship to nuclear weapons. Would any other isotopic separation techniques fall under the wing of any regulating agency in the United States (NRC, NNSA, etc.)? For...

I've been aware of this work for a couple of months, and it has at last got through the review processes and has been accepted for publication. Annan, J.D., and Hargreaves, J.C. (2009) On the generation and interpretation of probabilistic estimates of climate sensitivity, to appear in Climatic...

I am trying to amplify extremely small signal(around 200 nanovolt) from a coil of wire on a ferrite to make a gaussmeter, I've seen some FM transmitter schematics online that I want to connect this signal to, Would a FM transmitter be able to work with a signal this low? I tried amplifying...

Hello! I have the following problem My Physical System I have a sensor which changes resistance on application of force. Experiments performed In order to characterize the output of the sensor, I have done some experiments. In the one of interest here, I applied different forces and...

Hi, I have a large data set with with less than 10% missing values (missing response, but all predictor variables present). It is a near certainty that these values are not missing at random, dependent upon the missing value. The response is survival time of a land parcel with 'death' being...

Hi, I have a large data set with with less than 10% missing values (missing response, but all predictor variables present). It is a near certainty that these values are not missing at random, dependent upon the missing value. The response is survival time of a land parcel with 'death' being...

Came across a 2007 study concerning climate sensitivity. It was published by the Journal Nature, but only as a letter. Can't say exactly why they do that, but it probably hasn't been scrutinized as closely as it would be otherwise. Anyhow, in this study, atmospheric CO2 concentrations over...

Homework Statement Why is sensitivity in a potential divider circuit greatest when the resistance of the fixed resistor is equal to the average resistance of the other resistor (in my case a LDR)? This isn't a homework question, but I need to include a bit on why I chose the fixed resistor...

Hi folks, Homework Statement We have a voltage divider (more specifically, a resistive divider), with V_i volts input and resistors R_1 and R_2 in series. The output voltage, V_o, is measured over R_2. R_1 is a fixed ohmic resistor; R_2 is a potentiometer. I'm looking for an algebraic...

Homework Statement An inclined tube reservoir manometer is constructed as shown in the figure. Analyze the manometer to obtain a general expression for the liquid deflection L in the inclined tube in terms of the applied pressure difference \Delta p. Also obtain a general expression for the...

Is a radio telescope less sensitive on the galactic plane? If so, why? /San

True. I managed to drive myself to the hospital after being exposed to fragrances at work, and the triage nurse just waved me in based on my appearance. The intake nurse clocked my BP at 208/80 and shoved me into the ER. The ER nurse assigned to me was a classmate of my wife and contacted...

Homework Statement I read this question online. Estimate the length of your ear canal. Regard the canal as a narrow tube that is open at one end and closed at the other, at approximately what fundamental frequency would you expect you hearing to be most sensitive? Explain why you can hear...

I know CRIRES is unstable right now but it should be back to full operation next year I hear. Does anyone know what it's limit of sensitivity will be for radial velcoity measurements (in m/s)?

Can one correlate the effects of a change in weight to the transmission of vibrations (fish strike) through a fishing rod? I'm not an engineer. I don't know what equations may apply. I'm not even certain I'm describing the question correctly. I'd appretiate any assistance. I've attempted...

Hi, I am using a light sensor connected to an analog input of a microcontroller. My circuit turns an output high when there is a voltage of 2.5V or higher at the analog input i.e when there is a light shining on the sensor. But sometimes my output goes high even though I have no light shining...

I have been flying some model rockets powered by commercially available solid propellant engines. I have been flying at an elevation of 2550 above sea level. I am headed to a competition next week and will be flying near sea level. The air density will change approximately 5% due to the...

Hi, I have a question about the sensitivity of measurements in experiments. e.g. We measure the current of a circuit and it's 1A. if the sensitivity is 1 part in 100, does that mean we can't distinguish the current between 1-1/100A and 1+1/100A? Thanks

Homework Statement 1) A capacitor of capacity 3 micro farad charged by a potential of 2 volt when discharged through a Ballistic galvanometer gives a deflection of 24 divisions. Determine the sensitivity of the Ballistic galvanometer. Homework Equations The Attempt at a Solution...

I learned https://www.physicsforums.com/showthread.php?p=1098513&posted=1#post1098513" that some people are sensitive to lower frequency light than others. In fact, some people can see well into the infrared range. I was very skeptical, so I tested it out. I was right, I cannot see IR...

hello, I have to make a sensitivity model for a near infra red detector and I need help. I have so far done radiometric calculations taking into account noise, due to dark current, sky background, etc and calculated the minimum signal intensity i need. However, i have a few blocks: I need to...

what is the defination for the following:stress concentration sensitivity, fracture load cycle, notch size factor?? pls help thanx

I've got a question about CRTs... Is it normal for them to emit this low wining/ringing sound even after start up? It's annoying and headache inducing. My old TV became really bad with this, it was as if it was crying for blood ha, so I got a new one (also a CRT) and the same problem popped...