Interface Definition and 168 Threads

I read a lot of fiction and am on my third kindle E Reader. E Ink is very clever and is easy to read. I can carry more books than a human could ever hope to read. I really don't care that writing a screenfull of text takes my Kindle a long time compared with my other devices. BUT the interface...

Hello, I have question about friction at inteface between two component slip occurs at interface when external force bigger than friction force(= normal reaction force * static friction coefficient) After slip occured, component motion stopped and got new static equlibrium state In this...

I have a flat planar part made of crystalline sapphire (about ~2k weight, and polished to a mirror finish) that rests on three ball bearings, and I want to minimize the static friction at these 3 interfaces. The ball bearings are fixed so they cannot roll, and the sapphire part can only slip...

It is believed that Maxwell equations (together with other relations depending on the materials) are sufficient to account for any electromagnetic macroscopic effect. The problem is that, for a Maxwell equation to hold, it must at least be defined. Consider for example the case of two...

I would think that a force due to surface tension would act upwards on the plate and not downward, as shown in the diagram I have come up with. The surface of water would act as a stretched membrane and therefore there would be a surface tension on water surface in contact with the bottom of the...

Consider a container filled with two essentially incompressible liquids with densities ##\rho > \rho'## and (respective) volumes ##V##, ##V'##, rotated by a centrifuge in some orbit-based space lab to maintain a roughly constant (co-moving) simulated "gravitational field" g. Let's suppose that...

Years ago, most PC motherboards had a PS2 connector for the keyboard and (I think) most had a special chip that managed that interface. Now that most PCs use USB keyboards, is the keyboard interface still implemented by a separate chip?

I'm reading about excitation of surface plasmons, and there's a claim in the derivation I don't know how to prove. The geometry is two infinite slabs of material with negligible permeability (##\mu_1 = \mu_2 = 1##) and different permittivity ##(\epsilon_1 \neq \epsilon_2 \neq 1)##. The claim...

Hi, I have an e-mail for work, but I really don't like the web interface. I decided to forward every e-mail to my gmail account. However, once on gmail, if I reply toany e-mail, my reply will be sent by my gmail account instead of the one I use for work. Do you know know if there is a way...

How does sound reflect from interface at an angle? The propagation of light is determined by a single factor - index of refraction. Sound is affected by two factors - speed and acoustic impedance. Take the case of two substances with identical acoustic impedance but different sound speeds - one...

Owens - Wendt model is used for calculating surface energy on liquid - solid interface and it is given by following equation: $$ \gamma_{sl} = \gamma_s + \gamma_l -2(\sqrt {\gamma_l^d \gamma_s^d} + \sqrt {\gamma_l^p \gamma_s^p}) $$ So, if we use liquid and solid of known surface energy as well...

Welcoming any relevant literature!

Hi, So this is a purposely abstract question and no specific details of the battery have been provided. I was wondering what type of AWS service would be appropriate to send signals to a battery (to release or store electricity)? I was looking around on the website and couldn't quite figure out...

We have a system that requires software to program a fairly complex frequency synthesizer IC. Given the desired frequency, software executes an algorithm to calculate the values needed to be programmed into the physical device. We would like to have this algorithm contained in an independent...

The connections are as follows: The "D" pins are connected to the data bus, the "Q" pins to the device, the "E" control to the block address decoder, the "OE(bar)" to ground. Am I right?

Are there areas of studies which could be characterized as an interface of biological physics and quantum physics? Does such an interface even exist?

Imagine you create a diffuse interface in space and determine which side of the interface you are on by a local scalar value that can be between 0 and 1. We could create a circle, centered in a rectangular ynum-by-xnum grid, with such a diffuse interface with the following MATLAB code: xnum =...

Ok, so I somewhat randomly saw a recent video made by VICE about people with severe disabilities being treated with the help of modern bio-technology, the part at the second half of the video made me watch in awe as I found it hard to understand. Here is the video The questions I would have...

What's the most common error in using computer interfaces? The most common computer interface error that I make is clicking on the wrong "x" and unintentionally closing a window. I blame this on the fact that window managers use the same style of decoration for all windows, so all the "x"'s...

If the light slows at an interface, what happens to the photons coming in after the slowed ones? Can these cohere with the leading (slowed) ones and create what amounts to a FEL?

[url="https://www.physicsforums.com/insights/an-intro-to-the-systemless-interface-of-rooting-android-phones/"]Continue reading...

Hi PF! Suppose a 2D rectangular channel with wall-normal perpendicular to the downward gravity force ##F## rests is static equilibrium. What shape would the liquid take? Looking at the equations of motion, I think the following would have to be satisfied: $$\frac{d P}{dy} = -\rho F\\ \Delta P...

Imagine a bubble vibrating in air. Because it vibrates, it's interfacial area increases, thus new molecules are added and removed from the surface as it vibrates. Consider a molecule is initially at position X_0 at the interface, and over a certain amount of time molecules squeeze and disappear...

Consider a plate capacitor with a dielectric interface (\epsilon = \epsilon_0*\epsilon_r, thickness=d) tilted at the angle \alpha . Outside the interface \epsilon = \epsilon_0. Without dielectric interface is the field \vec{E}=E_0*\vec{e_z}. Determine the E-field inside and outside the...

Hi PF! Fluid lies in a 2D rectangular channel and oscillates from a disturbance. I have several .csv files, each corresponding to a moment in time, where within each are two lists of numbers: the ##x## and ##y## position of a fluid interface. I'd like to decompose the interface into it's...

Hi everyone, Someone posted this hypothetical problem on a facebook group and I am wondering what your thoughts are. The issue is that Snell's law does not seem to hold when applied to the transmitted wave (calculated using the electromagnetic interface conditions.) Here is an example...

E0=V/d = 100/0.1 =1000v/m In slab 1, E1=E0/k1=500v/m In slab 2, E2=E0/k2=250v/m Applying Gauss' Law to a box surface surrounding the interface with area equal to the plates we have (-E1+E2)*A = Q/epsilon_naught So charge density sigma = -250 epsilon_naught But answer given is...

Suppose we have an incompressible, viscous sessile drop subject to a time-dependent pressure field ##p## on a substrate. Let ##\mu## be dynamic viscosity, ##u## be the fluid velocity field, ##\kappa_{1/2}## curvatures of the fluid surface, ##\sigma## surface tension, ##\hat n## normals to the...

I am trying to determine a normal stress balance at an axisymmetric and dynamic fluid-fluid interface, ##z(r,t)##. For a static, free surface, this simplifies to the Young-Laplace equation: $$ \Delta p=\rho gz-\sigma2H=\rho gz-\frac{\sigma}{r}\frac{\partial}{\partial r}\left(r\frac{\partial...

Homework Statement We have an incident electric field, and there are two cases: 1) the field is polasised perpendicularly to the incidence plane (TE) 2) polarised in the plane (TM) Here I must be able to correctly apply the limit conditions, to find the Fresnel formulas that give the...

I'm studying for an exam (so this is existential) and I never really got how to write the limit conditions for an interface. In my problem, there is an incident electric field, and there are two cases: 1) the field is polasised perpendicularly to the incidence plane (TE) 2) polarised in the...

Hi all, I'm new to Fortran programming, so I might probably ask some really trivial questions - please forgive me. I have two source codes of big programs. One is coded in Fortran77 and the other one in Fortran90. Now, I need to build an interface so that the Fortran90 program can call some...

Hello, I am going to interface wireless frequency meter transmitter with Arduino but before starting regarding sensor, I need to test the signal strength of this sensor (at different distances) by interfacing it with Arduino, I have never been used such kind of sensor before so any suggestion...

At the interface between: 1) conductor/conductor 2) conductor/semiconductor (or dielectric) 3) semiconductor/semiconductor (or dielectric/dielectric) What quantity should be continuous? Is it the electrochemical potential, only the chemical potential or is it the electric potential? Since they...

Hi, I have some confusion about the jump conditions for an electric field across an interface between two materials with different properties. In general, we have the two jump conditions across an interface: n.(ɛE)+ - n.(ɛE)- = σ...

This thread refers to a paper I am working on. The paper said in the model section that: In the complete set of scattering states we distinguish two orthogonal set of eigenfunctions: (i) the states − → ϕ incoming from the left, and (ii) the states ←− ϕ incoming from the right. Away from...

sorry I am going slightly off the topic. <<Moderator's note: split off from this thread.>> I asked this question because I'm studying a paper concerning the presence of spin orbit coupling at the interface between two metals. This is the part of the paper I'm studying: "Our aim is to...

Is the equation used to determine the density of interface states in schottky diodes from capacitance- frequency data applicable to PIN junctions?

Suppose I have a wave tank partially filled with a shear thickening Newtonian fluid (Oobleck), on top of which sits a layer of water (separated by a thin membrane to prevent mixing) If I propagate a surface wave in the water layer how will it conduct itself at the Newtonian/Non Newtonian Fluid...

Hi. What do I call Instance Classes, Interface, Abstract Classes, Partial Classes, Static Class, Sealed Class collectively? Thanks.

Homework Statement I have an infinitely long cylinder of a dielectric material, surrounded by another dielectric material and coated with graphene which has surface conductivity \sigma, implying it has a superficial current. The sheet of graphene is very thin, and the dielectrics are asumed to...

Homework Statement I'm trying to do all the calculations for the attached paper, and I'm having trouble with the boundary conditions for P polarization. My question is, how can I arrive to those conditions? The problem is 2D, an infinite dielectric cylinder coated with a layer of graphene...

I have a SPI with a master and a slave: How the system knows what's the starting point of the data sent ? It's ok that we have the clock, but both MOSI and MISO have a default state on "1", that may be sampled as data sent

Does an interface between two different phases necessarily satisfy the KPZ equation if the interface is in the KPZ universality class?

So the recent fun thread about Smart Phone uses: https://www.physicsforums.com/threads/what-do-smart-phones-partially-replace.932077/ reminded me of several Apps I'd like to write that involve external hardware. Think DAQ or other types of external hardware. Do most external hardware modules...

Homework Statement The xy-plane serves as the interface between two different media. Medium 1 (z < 0) is filled with a material whose µr=6, and medium 2 (z > 0) is filled with a material whose µr=4. If the interface carries a current (1/µ0)ˆy (y- hat) mA/m, and B2 = 5ˆx (x-hat) + 8ˆz (z-hat)...

I have created a savonius turbine model with 2 blades using 3D gambit. I want to simulate the flow of air flowing so as to drive the turbine savonius spin (unsteady, incompressible). Geometry consists of 3 volume boxes (domain tunnel flow), cylinder (domain grid interface), blade savonius...

I try to follow these steps and I am not sure but my interface might be different. I cannot see geometry options in my structural template in contrast to the vid. Here my template: Thank you.

I am writing a program, and only care about one abstract method in window listener: windowClosing(windowEvent e){} Because of this, I would like to write a new interface windowSomthingCleverNameWise that extends window listener and does nothing with all of the methods except for windowClosing...