Process Definition and 1000 Threads

Hello people, Before Physics Forum closes my post like they always do, I just want to say that I have really searched for this subject on every search site and looked in more than 15 fluid mechanics, thermodynamics, heat-transfer books and I have found very little about steam engines. And I'm...

I am really confused that the whole process of the method of image. Suppose I have the + q near the infinite conducting plane which is grounded. My first question is: Is the conducting plane grounded before putting the +q or after putting the +q then grounded? The first question would lead to...

Hey guys, I encounter a question (maybe a silly one )that puzzles me. Nt is a Poisson process and λ is the jump intensity.Since the quadratic variation of Poisson process is [N,N]t=Nt, and Nt2-[N,N]t is a martingale, it follows that E[Nt2]=E[[N,N]t]=λ*t. On the other hand, the direct calculation...

So I realize that I'm probably wrong about this, but it seems to me that Hawking radiation cannot be emitted only at the event horizon. If we make the (albeit almost certainly wrong) assumption that the quantity of emitted particles is directly proportional to the potential for gravitational...

I wonder what the name of this normalization process is for better reference. The scenario is like this: $$\left|\Psi\right> = \frac{1}{\sqrt{6}}\left(\left|a\right>+\left|b\right>+\left|c\right>+\left|d\right>+\left|e\right>+\left|f\right>\right)$$ where each of the components inside the...

Rhodium recovery process from ore

Hello, 1. Homework Statement I am to implement a program where the parent process creates three child processes each running their own specific code, child 1 will be running a wallclock, child 2 will be a file manager and child 3 will be the countdown timer and is also the signaler. Child 1...

Hi I was trying the gram schmidt process on example 1.3.2 page 43 as shown below u1=(3,0,0), u2=(0,1,2), u3=(0,2,5)v1=u1=(3,0,0) v2=u2-proj_(w1) u2=(0,1,2)-((<0,1,2><3,0,0>)/9)(3,0,0) However the top line inner product gives 0...

I'm sorry for bad english. I wonder what is the differences between reversible-isothermal-expansion and irreversible-isothermal-expansion. Is their entropy same?

Stochastic process problem! 1. If Xn and Yn are independent stationary process, then Vn= Xn / Yn is wide-sense stationary. (T/F) 2. If Xn and Yn are independent wide sense stationary process, then Wn = Xn / Yn is wide sense stationary (T/F) I solve this problem like this: 1...

written as title, 1. If X(t) is gaussian process, then Can I say that X(2t) is gaussian process? of course, 2*X(t) is gaussian process 2. If X(t) is poisson process, then X(2t) is also poisson process?

Hello all! I have a hard time about this one: Think of an adiabatic process (can be either reversible or irreversible - doesn't matter). dQ = 0. Assume only, mechanical work is done on/by the system. So by 1st law of thermodynamics, dU =dW. Now, everything is clear to me when I am dealing...

Question already asked on http://math.stackexchange.com/questions/1310194/confusion-about-a-random-process?noredirect=1#comment2661260_1310194, but couldn't get an answer so reposting here...

Hi all, I have this dynamic: is a Mean Reverting process. I want to simulate the sde with MATLAB but I am a beginner and I have some problems. I show you the code that I have created: %% Simulazione prezzo Geometric Ornstein-Ulenbeck clear all clc %Parameters mu = 0.5; sigma = 0.12; eta =...

The production of light is always accompanied by the emission of electrons. Example, when a candle flame emits light by the combustion of candle wax where the oxidation process of candle wax produces light which I believe can be considered an ionization effect or an oxidation process since...

Homework Statement Nitrogen at 100°C and 600 kPa expands in such a way it can be approximated by a polytropic process with n=1.2. Calculate the work and the heat transfer if the final pressure is 100 kPa. Homework EquationsThe Attempt at a Solution I used the equation T2/T1=(P2/P1)^[(n-1)/n]...

hi all, this is Entropy Rate Balance for Control Volumes. in the case of throttling process, .throttling process is irreversible process, so (S2- S1) must be greater than zero. what i want to know is to prove that (s2-s1) is greater than zero. Thank you in advance.

hi all! I am learning basic thermodynamics. I already know that expansion process of fluid through a throttling valve is irreversible process. what i wonder, why this process is irreversible. as far as i know, if delta S>0 <-- irreversible process. i want to know why Entropy of expansion...

why in dual cycle heat addition at constant volume process is first then after heat addition at constant pressure process is done?

Homework Statement Isothermal process![/B] I have a cylinder with base area of 0.01m^2. I have a piston that is 0.1 meters from the bottom giving a volume of 0.001m^3. I have a weight of 1500 Newtons. This gives a pressure of 1.5E5 Pa. Now, I remove 500 Newtons and the piston moves upwards...

Hello, I am wondering what the process is to becoming a medical physicist. There isn't an incredible amount of information on the matter. It seems to be somewhat of a budding field. How far do you take your education? What is the process like after attaining the necessary education? What would...

π- + p→Λ + K0 Why is this a strong interaction instead of weak? Since the quark content changed.

Hello. I want to know the full in-detail process which happends inside our Sun's thermo-nuclear core. As far as I know the steps in the H - He fusion process are: 1) H+H -> He2 2) He2 can rarely decay (Beta plus) into Deterium and a positron 3) If so Deterium + H -> He3 4) He3 + He3 -> He4 + 2H...

Homework Statement A 60 kg tight-rope walker carries a long beam with a mass of 30 kg across a 10 m long wire. When she is at the centre of the wire (i.e. 5 m across), each section of the wire makes an angle of 5° to the horizontal. Assuming that the mass of the wire is negligible, calculate...

Homework Statement The molar fraction of methane dissolved in water can be calculated from Henrys constant which are: 4.131 atm at 25ºC and 5.771 atm at 50ºC. (a) Determine if the dissolution process of methane in water is exothermic or endothermic, and calculate the value of the enthalpy of...

Hi, I'm currently doing an assignment on nuclear physics. One of the questions in said assignment is asking me to state the decays which usually happen within a nuclear power plant, as well as stating the fission products, explaining what's happening, and showing the equation. One of the sites...

When we were taught these in the class. There were a few terms I did not understand which my school teacher used. Firstly, they told us that the work in a reversible process occurs at the boundary of the system, an acceptable fact. All the energy is converted yo work done, and then showed us a...

Is work done in adiabatic process quasi static or not?

What are the commonly asked questions for the semiconductor process engineer position ? I am assuming cleanroom equipment working principles.. what else? Thanks in advance for your responses.

Hello thanks for looking at my post. I run a farm and we are having water quality issues. I have come up with a possible solution but implementing is causing issues. I have drawn a very basic design. My main issue is the pressure of the water. The system will be gravity feed but the water...

Homework Statement Customers arrive in single server queue to be serviced according to Poisson process with intensity 5 customers an hour. (a) If the customers begin to arrive at 8am, find the probability that at least 4 customers arrived between 9am and 10am. (b) Find the probability that the...

Homework Statement (56th Polish Olympiad in Physics, 2007) We have a tube of mass ##M##, consisting of two segments of diameters ##d_1, d_2##. The pistons (see the picture http://www.kgof.edu.pl/archiwum/56/of56-2-1-R.pdf) have mass ##m_1, m_2##. At the start the air inside had pressure...

Hello, I am working on a process design project and was wondering if I could get some help. While this is classwork material, I thought this is too big of a problem to post in the homework section, and would be more suitable in a forum such as this one which has much less traffic. For...

Let x(a) be the extinction probability of a branching process whose offspring is Poisson distributed with parameter a. I need to find the limit as a approaches infinity x(a)e^a. I tried computing x(a) directly using generating functions, and I found that it's the solution to e^(a(s-1))=s, but...

Why does or how does combustion of fuel and air in a combustion chamber in a brayton cycle is idealized by a CONSTANT pressure. I remember that in a diesel cycle, it was idealized by constant pressure because as P increases by ignition but the volume increase offsets this increase. However, in...

Homework Statement Air is compressed at room temperature from atmospheric pressure to ##\frac{1}{15}## of the initial volume. Calculate the temperature at the end of compression assuming the process is reversible and adiabatic.Homework Equations ##pV^\gamma = constant \Longleftrightarrow T...

This is a graph obtained during throttling process by keeping pressure and temperature at the inlet of the valve fixed and varying them at the outlet to get different isenthalpic curves for different inlet pressures and temperatures. Is it true that the sudden change in temperature of this...

I was assigned a problem in my Engineering Thermodynamics class as follows: Problem: An ideal gas in a rigid closed container undergoes isochoric heating from T1 = 27 C to T2 = 77 C. Initial gage pressure is 300 kPa, pressure of surroundings is 1 atm. Find the final gage pressure. The way to...

In the following process flow diagram for the production of hydrogen, why is the amine column placed after 2 heat exchangers?

In principle, what happens when an ideal gas undergoes an isothermal process? How is the gas at a constant temperature; is it maintained at that temperature? If we supply heat to the standard ideal piston assembly, why, or rather how is the heat supplied completely converted to work done by the...

I am a member of a small group of physics graduate students in charge of a monthly series of public science lectures. The lectures are aimed at local high school students, and we have many high school teachers who encourage their students to attend by offering extra credit. The audience of each...

I was studying 2nd law thermodynamics. In that context found the clausius's inequality saying closed integral of dQ/T <0 for irreversible process. And from the reversible process entropy was defined. And from that view they said that for irreversible process dS>dQ/T. Now when I saw some...

In process plants many heating applications will use steam at approx 120 C whereas the standard cooling utility is cooling water at approx. 30 C. In the dozens of plants I've seen I cannot recall having seen even one Heat Pump. Why is this so? Is the capex too high? Or are compressors too...

Hi everyone, just created my account so this is my first post. I'm from Portugal and I'm studying Mechanical Engineering in FEUP. So my doubt basically is about internally and externally reversible processes. "Water is on a pipe with constant diameter initially at 50 ºC 7000kPa, and in the...

In class we're currently learning about reversible and irreversible adiabatic processes. For reversible process, we got dq=0, so dU = dw = -P*dV = Cv*dT. What I don't get is where did the Cv*dT come from? I remember q=C*dT, but dq = 0 so I'm not sure what that means? Also, where does Cv*dT...

What are your thoughts on the fact that most math PhD program applications do not contain interviews? Consider the following link: https://quomodocumque.wordpress.com/2011/11/21/are-math-departments-better-at-recruitment-than-elite-financial-firms/ One of the comments expresses concerns about...

We know that a homogeneous Poisson process is a process with a constant intensity $\lambda$. That is, for any time interval $[t, t+\Delta t]$, $P\left \{ k \;\text{events in}\; [t, t+\Delta t] \right \}=\frac{\text{exp}(-\lambda \Delta t)(\lambda \Delta t)^k}{k!}$. And therefore, event count in...

I am going to report about Adiabatic process, specifically in cloud formation. Can someone help me some important points to consider?Im more concerned in cloud formation only since my topic is limited in that matter. 1. What is the science behind the adiabatic process in clouds? 2. Some...

Dear all Kindly anyone suggest me any Process in which catalytic Agent provides -OH or -O (Epoxy) and then after forming Product takes back -OH or -O. We have to consider only these functional groups -OH or -O. Thanks in Advance.

The problem is:Let $W(t)$, $t ≥ 0$, be a standard Wiener process. Define a new stochastic process $Z(t)$ as $Z(t)=e^{W(t)-(1/2)\cdot t}$, $t≥ 0$. Show that $\mathbb{E}[Z(t)] = 1$ and use this result to compute the covariance function of $Z(t)$. I wonder how to compute and start with the...