Issues Definition and 407 Threads

Dear All, first of all I want to say thanks for this great forum!, which I am following since many years ago. I have never participated, but I have read almost everything for years hehe. But I currently have a personal issue, which I would not talk about with my colleagues and which is...

https://www.dropbox.com/sc/eo2c8j4kd12pdvn/AACGJ8YZvk35BSX1BsBoKIIsa Please view the above image. I am getting awesome contrast on the periphery of the image but hardly any in the center. The sample is an H and E stained tissue and I just got the microscope in today. I am a rookie with...

Posts dated before about 5 PM EST 8-Aug-2015 were split off from the Donald Trump thread. You may need to refer to that thread for some context. ------------------------ Just curious: 1) Next Mexican flow is negative, but they should still pay for a problem for which they are not responsible...

Okay here is the scenario: A character, we'll call him Joe, is sitting in a college somewhere in America today and studying two disciplines; neurology and virology. He is going to become accomplished in both in the next ten years. What he is studying is the rabies virus. He is trying to figure...

My first question states y=a^3+cos^3 (x) (I couldn't quite figure out latex again.) The derivative using the chain rule I found to be y'=(a^3)(ln a)+3((cos (x))^2)(-sin(x)) = y' = (a^3)(ln a)-3((cos (x))^2)(sin (x)) The second question y=[x+(x+sin^2 (x))^7]^5 Derived using chain rule...

Homework Statement Hello! One of the easiest rules (when possible to apply) to factor a quadratic is to find both x-s by x1 + x2 = b x1 * x2 = c Homework Equations Please, take a look at what is written in the book. I can't grasp why x1 = -2 and x2 = 3, and not, as I thought, x1 = -3 and x2...

I am currently taking Electrical Engineering at a local college outside of the United States. I will be direct and explicit about my issue here: I am getting terrible grades, possibly failing three classes this semester and I don't see myself adjusting properly in my current college. I am...

Hi, Can anybody explain to me what the major noise issues are with mems closed loop accelerometers

Hello everyone, I wanted to learn about the issues that the aerospace industry is currently facing. Could anyone please help me in this regard. I searched on the internet but could not find a proper website that explained this. So I thought this forum was the right place to ask about this...

The Loops conference held every two years, or so, gives us a good window on what the active lines of development are, what the organizers consider the main issues to be addressed and who they see as leaders in the various LQG research areas. LQG is a research community rather than a single...

Hello! (Wave) I am writing a text in LATEX. Since the equalities I wrote are longer than the paper's size, I tried to break the line as follows, but it failed. \begin{multline} y'=y+4 \pi \cos(4 \pi t)y \Rightarrow y'=(1+ 4 \pi \cos(4 \pi t))y \cap \Rightarrow \frac{dy}{dt}=(1+ 4 \pi \cos(4...

Homework Statement Hello! I would be grateful for your help. I've tried many many times to record a mixed reference macro on my mac, and it doesn't record a thing. No problems with recording separate macros with relative or absolute reference. Problems description: I have few sheets with...

for: solve([k^2=(xa-xd)^2 + (ya-yd)^2,k^2=(xb-xd)^2 + (yb-yd)^2,k^2=(xc-xd)^2 + (yc-yd)^2],[xd,yd]); the output is simply : [] I want it to solve the system : k2=(xA-xD)2 + (yA-yD)2 k2=(xB-xD)2 + (yB-yD)2 k2=(xC-xD)2 + (yC-yD)2 for xD and yD. I already solved it by hand but wanted to test...

The braking distance for a car at 30mph is 13.5m and 6.0m at 20mph. Thinking distance is directly proportional to speed. Show that the thinking distance at 20mph is 6.0 m. This question has baffled me, pls help

There are reports of a renewed reactor shutdown at Zaporizhya, the Ukraine's largest nuclear power station, as well as rumors of possible radiation leaks: http://www.zerohedge.com/news/2014-12-30/ukraine-hiding-huge-radiation-leak-largest-nuclear-power-plant-Europe Given wretched weather and a...

Hello all, I have not been everywhere in America (not even close), but of the places I have been to, the structures and roads left a great deal to be desired. In the city of my college, for example, the roads are of absolutely atrocious quality. So here's a hypothetical proposal, and I'm eager...

Homework Statement I am trying to find a damping ratio. I know ##k=50## lb##_f##/in, ##m=50## lb, ##c = 0.75## lb##_f##-sec/in. Homework Equations ##1## lb##_f##/in = ##175.1268## N/m ##1## lb = ##0.4536## kg The Attempt at a Solution Then ##k = 8756.34## N/m, ##c = 131.345## N/m-sec, and ##m...

I'm trying to get an understanding on what's going on with some data of mine. I've attached some plots below. This data is from and accelerometer and gyroscope where I've calculated the global accelerations and velocities (top and bottom plot respectively in each figure). The data is from the...

Hello all, I am currently involved in a diagnostic project for an induction motor with suspected rotor stator contact. all critical dimensions have been checked but the question has been raised by none electrical observers: Does the location of the rotor bars effect the magnetic center line...

So I've been having consistent problems with my wireless connectivity. I ran the troubleshooting option and got the following results: Connectivity Packet statistics Ndis Rx: 12929 Ndis Tx: 7601 Unicast decrypt success: 1845 Multicast decrypt success: 0 Unicast decrypt failure: 0 Multicast...

Homework Statement Hello! I would be grateful for the help. Please, take a look at the picture attached. In the sixth column you can see that 50 000 were repaid during this period. My questions are: 1) why in the formula for % this 50 000 were added but not subtracted (the formula is also on...

In many posts with large LaTeX symbols, such as summation sigmas or the parentheses of a matrix, the upper part of those large symbols aren't displayed until you highlight them. If you then scroll them off the visible part of the page and then scroll back, they're messed up again. You should be...

I really need an expert for these two: 1. How can we correct the clock of a satellite due to time dilation effect due to its motion relative to the ground when ground-based clocks can be equally considered in need of correction due to their motion relative to the satellite? Both equally valid...

I need to figure out how to create a matrix that has zeros in everything except the diagonal, and I need the diagonal to be random numbers from 1 to 5. I tried a few different variations like this: R = eye(5)*7*randi(10,5) But I keep ending up with values in every row and column and I am at a...

from 0 to π/2 ∫sin5θ cos5θ dθ I have been trying to solve the above for quite some time now yet can't see what I am doing wrong. I break it down using double angle formulas into: ∫ 1/25 sin5(2θ) dθ 1/32 ∫sin4(2θ) * sin(2θ) dθ 1/32 ∫(1-cos2(2θ))2 * sin(2θ) dθ With this I can make u = cos(2θ)...

Hello all, There are a million threads and a million Google hits out there on the topic of switching the polarity of an electromagnet. Very simple stuff. But none seem to touch on the issue of inductance. I am building a small linear actuator that will be a coil wrapped around a thin plastic...

Hello everyone, I have an rather large piston-cylinder containing gas that is compressed when the piston extends. Using three sensors I am measuring the pressure, temperature and volume of the gas while I force the piston out using a winch. The system is closed and no gas is released or added...

I am trying to do an introductory course on C++ through OCW (MIT). However, there is this one they tell you to try that I keep running into a problem with. This is the information they tell us to input: #include <iostream> using namespace std; int main (){ int x; cin >> x...

So apparently I have issues with my sleep and according to a sleep study I had done I only spend about 1.5% of the night in stage 3 sleep. During the day I usually experience significant fatigue and it is extremely difficult to do things like read, work, calculate the cube root of pi... you...

After reading about everything I can find on the subject while researching for a story, I've come to the conclusion that wormholes (or "jump" drives or gates) are the only potential "class" of FTL mechanisms which are even remotely (not a problem for fiction) plausible while also not opening the...

I've heard of issues in low pressure chemical reactors where the interior scaling might flake off when a vacuum is pulled. Which principles govern this? I know it has to do with internal shear forces and am wondering if a vessel wall would ever split in half. I saw this related...

Good afternoon PhysicsForums! I have a design for a voltage controlled current source. I've included the circuit diagram. The basics of the design is that I have an AC voltage and a DC Voltage summed then passed through a 1MOhm resistor to give me a current on the order of 1 microAmp. This of...

Hey everyone, I've been working on this project for awhile (some of you may recall having seen a very early version), and I am so close to being finished, but I have a problem somewhere, and I can't figure out why. So what is happening here is that this code is supposed to calculate the...

Hello! I have an assignment question that is a proving a real stone in my shoe, mostly because it is reminding how little I can recall about electromagnetism. It is part of a series of questions leading to the calculation the Alfven radius, where the solar wind decouples from the Sun's magnetic...

My company is working on a few concept ideas for our field. Currently we are looking at jump packs concept work. We are looking to lift a human about 180 pounds, and about 50-60 pounds of gear = 230 Pounds Total. Our goal is to lift that weight about 20 Feet in the air while the subject is in a...

Homework Statement The wind exerts a force of 420 N toward the south on the sails of Gerry’s sailboat, while the water exerts a force on the sailboat of 160 N west.The boat and Gerry have a combined mass of 320 kg, what are the magnitude and direction of the sailboat’s acceleration...

hi I am having trouble trying to find what i potential to the voltage of a rs 256-225 flow meter. Has anyone got an idea to put me on the right track all i need is the push in the right direction. Thanks

Hello I use kubuntu on my computer. Until recently I could normally connect the internet in the university, but now it is impossible. It connects to the network but it doenst redirect to the login screen, hence turning impossible to use the internet. Can someone solve this for me? Thanks.

My Calc II class is currently doing Calc I integration review before we get started with integration by parts. I am using an online system that gives immediate feedback on my work and it has said that my answer is wrong. Not sure where I'm going wrong. Homework Statement Evaluate: \int...

During the Fall semester (due to unforeseen circumstances with losing daycare) I had to switch my MATLAB class to an audit. The Professor agreed but there was an error with getting all the necessary paperwork in and so it has been referred to the deans office. I recently received a message...

Homework Statement Determine the resistance of a 0.2H coil used to replace the inductor if the circuits time constant falls to 0.55ms. Homework Equations l/R The Attempt at a Solution L/R = 0.2H/R = 0.55ms Transposing for R... R = 0.2/0.0055 = 36.36Ω is the resistance of the coil?

Homework Statement I have a 13 foot long beam supported by a pin at x = 0 feet and a roller at x = 9 feet. There is a triangular distributed load of 50 lb/ft from 0 ft to 9 ft. (Increasing as it approaches 9 ft) At the end of the beam there is a moment of 200 lb-ft counter-clockwise.Homework...

Homework Statement Using circuit analysis calculate the inductance (L) within an electrical 50hz AC circuit containing a 12Ω resistor and inductive reactance of 5Ω which are in series. Homework Equations Inductive reactance: XL = 2∏FL Therefore inductance: L = XL\2∏F The Attempt at a...

This horse has been beaten so many times, it's not funny. But I, like everyone else need words of advice from people that aren't going to tell me what I want to hear (or maybe they will). Anyway, I messed around a lot after high school, took numerous classes at various community colleges...

In the attached problem, I don't understand why members CD and DE are equal to 0. I was under the impression that the combined vertical components of BC and CD should equal 6+downward components of BC and EF, as to counteract the force straight down, but this is not the case. My questions...

Homework Statement Use the definition of a derivative to compute the derivative of the function at the given value. P(t)=t^3-4, t=-2 Homework Equations Please help me solve it in this form: f(a+h)-f(a)/h lim h→0 The Attempt at a Solution...

I know this may sound kind of weird but I strongly believe that I should be able to do whatever I want whenever I want in my room. It's my room. People tell me that nobody gets what they want all the time. While that is true, when I'm in my room it's not. For example in high school when I...

I am trying to build a keyboard sewn into a shirt and I wonder if I need to worry about EMC/FCC issues with the conductive thread to the keys? For each key I use a normal (but very thin) pushbutton, the wire length to the arduino controller will be no more than 150 mm and I will use DC 3-5v...

well,latex is not working on my samsung mobile so what i could do is just participate in polls and post this in chatroom :(

SO I ordered the axe026 serial preograming cord to use with my picaxe 08m2. To plug it into the usb I am useing a usb to serial converter. But it's not working at all! I know my program is right but do I need a special driver? I downloaded the driver for the 026 AND 027, neither are working