Cell Definition and 899 Threads

Homework Statement A 6V battery us connected in series with a 1.5V flashlight cell. What possible terminal voltages are available? Homework Equations V = emf-Ir The Attempt at a Solution If the flashlight cell is 1.5V, then I think that it will burn out at voltages above 1.5V. So...

Hi all, Im trying to think of a way of generating non-intersecting randomly oriented cylinders within a unit cell volume for micromechanical analysis. Several research papers suggest a monte-carlo approach was used by displacing cylinders by vectors until the "condition was satisfied" -...

Hi all, I read The unit cell is the smallest structure that repeats itself by translation through the crystal. Some says premitive unit cells contains atoms only at the corners while a unit cell may contain extra atoms in between(like bcc or fcc). At one place I found this: For each...

I am making a human stem cell from its molecular components(just pretending to do it right now but might be able to do later in life). I have extracted my DNA and formed a liposome. I have the DNA replicating in an incubator at 98.6° F, 5% CO2, and 95% humidity. The temperature is because it...

Homework Statement Homework Equations Nernst Equation where Q = [product]/[reactants], R = 8.314, F = 96500 The Attempt at a Solution I got E° to be 0.012 V because E° of cathode - E° of anode. -0.131 - (-0.143) = 0.012. The balanced equation I got was: Pb2+ + Sn → Pb + Sn2+ For the values of...

We are considering recovering the silver out of our waste fix solution from the photo labs on campus. What is the best (reasonably acquired) material (as in non-platinum) for the cathode/anode?

Hi, Please don't be spooked by the long post, it's just that it contains two problems (I beg your pardon if I shouldn't have put both in one post, I just figured it'll be better than creating two posts...). I can't figure how to solve these, so if you please could please help me with...

I know that a House Hold Phone Jack gives the Phone pluged into it the Low Level Powere to work. And I always see in movies and Hear how if you have just a Cell Phone you can take the Wire right from the Phone Jack and connect them to the Cell Phone. I do not understand this because even...

A quick google search found that there are 2 kinds of bar code scanners. One uses ambient light and a CCD device, these obviously would have no problem with a bar code on a screen since it is essentially just taking a picture. The other kind sweeps a laser over the bar code and reads the...

I'm interested in nanotubes, and buckyball combos. I imagine playing with the a buckyball toy, and a nanotube toy, similar to how I used to play with legos, and kinects. I think of the interesting things that buckyballs can do inside the system of a nanotube. The best creatively inspiring...

Homework Statement Above is the basic cell drawn with an object inside of it. You look in top view of the basic cell and the space around it filled with virtual cells. You can see the top view of a basic cell (the square [that is marked blue] formed by the four real mirrors with a...

I am using NiSO4 aqueous solution, Pt anode, Cu cathode coated with Au for Ni electroplating (at 3 V DC) on Au. Cu is not exposed to solution. To calculate cell potential should I consider Cu/Pt or Au/Pt. If I replace Pt with graphite, whether for same 3 V DC supply Ni plating would be...

Hello, I graduated last year for mechanical engineering and have a project that i am working on at home that i need some help on with the electrical part. what i am trying to build is a shock dyno, i need to measure force and velocity, i plan on using a lvt and a load cell unless someone has a...

How is the cell constant "d" related to the cell parameters? I know that for the smallest possible diffraction angle d is equal to the longest cell edge. Why?

As far as I know, when the light is shining on the solar cell (PN junction), current would be stopped if voltage reaches to Voc (open-circuit voltage). Is Voc equal to the difference between fermi level of n-type and p-type parts?

I was thinking of plating iron or magnesium on to copper with a galvanic cell. Would this work? 3Cu(s) + 2Fe2+(aq) --> 3Cu2+(aq) + 2Fe(s) Cu(s) + Mg2+(aq) --> Cu2+(aq) + Mg(s) In the cathode, when the Cu turns into Cu2+ and makes Cu(OH)2, of what use is it? And in the anode, when the O2-...

Homework Statement Calculate the open cell voltage for an H2/O2 fuel cell operating at P=1atm and T = 100°C Homework Equations Nernst Eq: Eo+(RT/nF)*ln[(aH2)*(aO2^1/2)/(aH2O)] The Attempt at a Solution E=1.17V+((8.314J/mol-K)*(373K))/((2e-)*(96486C/e-))*ln[(PH2*PO2^1/2)/PH2O]...

I have some difficulty understanding how the volume per unit cell for the diamond structure is calculated. I've seen in various websites that this volume is: ##v=a^3 = \left( \frac{8r}{\sqrt{3}} \right)^3## Here ##r## is the radius of an atom. But how did they work out ##a## (the edge of the...

i first formally learned about the cell in my chemistry class. their explanations for how it works was very unsatisfactory for me; so i wondered if this was rather a physics question. i have two half cells connected by a conductor (between the plates) and a salt bridge. i ask people why is...

I am doing a lab experiment in which I need to find the capacitance of an electrolytic cell containing water and of course hydrogen and oxygen ions. The cell has both a double layer capacitance as well as a pseudicapacitance. My initial studies show that I would use cyclic voltammetry...

Hello, I am working on a system where a laser does something and then there is a lot of wasted laser radiation. I want to capture this waste radiation in a small array of solar cells then feed the resulting current back into the laser to make it more efficient. The output from the solar cells...

Hi, I've been studying the cochlea, and how the hair cells (IHCs) receive sound, and some amplify it (OHCs) ; and am trying to get an idea of the density profile of hair cells acting as a spatial filter. The smallest discrimination in frequency that is positional (not temporal) coded...

I have very very very bad eyes and I can not see anything very small. I do have glasses but I can not use them in the Fay light. Any cell phone I can not see to use and I know they can be setup for voice calling. But I do not think it will work that good with me. I have to talk to it...

Hi, here is an example of a concentration cell http://www.jce.divched.org/jcedlib/qbank/collection/conceptests/echem.html 1/ The final state is assumed when concentrations are equal in each compartment, right? 2/ Graphic evolution of the voltage is a decreasing curve, right?

Homework Statement The given quantities are the shunt resistances across each of the 3 diode junctions,assume them to be Rsh1,Rsh2,Rsh3; Tunnel diode resistances as Rt1 and Rt2, Photocurrent for each of the junction be Ip1,Ip2,Ip3 and bandgap of each subcell be Eg1,Eg2,Eg3 are given.Let V & I...

Homework Statement I have to analyse the power output of a solar panel using a basic electrical engineering circuit analysis of a solar module if a complete row of solar cells in it is shadowed (For example, such shading might be caused by dust that slides down the surface of inclined panels.)...

The problem with WolframAlpha is several-fold: 1. You can't enter multiple commands. 2. Without paying for WolframAlpha Pro, you can't save generated graphs to your hard drive as files which you can then insert into other documents, such as a $\LaTeX$ document. 3. I've noticed WolframAlpha...

Hi As I am preparing for a presentation about modern http://scopewe.com/tag/fuel-cell-2/ I need some reference books or articles about fuel cells and the technology of these cells. I appreciate any information about these cells: 1.Solid oxide fuel cell (SOFC) 2.Alkaline fuel cell (AFC)...

Is usual cell phone capable to be programmed to produce pulsed modulated signal? For example having repetition rate 60 Hz with pulse width 30 microseconds?

Hi, I have read loads on LCD operation and in particular NT-LCD and understand the twisting of the light by the LC. Everywhere i read it states that "the thickness of the cell is crucial for correct operation" but does not say why! Why is this? Is it to do with the pitch of the LC helix...

Hello, I'm having a bit of a hard time understanding the concept of calculating the emf of a cell (e1) By connecting it to a potentiometer. the thing where I am getting confused is why do we connect the cell as in -++- And not -+-+. Kindly help

Homework Statement For public health reasons, you are investigating small systems that turn sea water into drinking water. One portable system takes a volume of saltwater and produces two thirds that volume of freshwater with an increased concentration of salt in the other third of the volume...

E.g. you cut yourself in the finger. The cells seems to know they will become part of your finger. (No lung tissue will be formed in your finger)

In the cellular method of calculating the band structure: Why we have to take zero the normal derivative of the wave function at the Wigner-Seitz cell's border?

I tried today to calculate the power that the solar cell produced, connecting it to an ammeter(digital) and a voltmeter(digital) in series, my initial idea was to use the P=IV formula. However as i carried out the experiment the ammeter gave a showed 0.00 whilst the voltmeter showed 0.56...

Is there a difference between these two things or is an electrolytic cell just a larger version of an electrolytic capacitor?

Homework Statement Pt l H2 (1atm) l HBr (1x10-4M) ll CuBr l Cu = 0.599 V at 298K i) determine the overall cell reation and calculate the Ksp of CuBr at 298K ii) What would be the effect on EMF if pressure of H2 increases from 1atm to 2atm. Why? Homework Equations CuBr = Cu+ x Br-...

Very often the principles of faraday cage are extended to non electrostatic situations, i.e. situations involving time varying electric and magnetic fields. This means that the interiors of a metallic shell should be impervious to external time varying electric and magnetic fields. However, I...

Hello, I have Omega made load cell with 150g capacity,Rated output 2mV/V, Excitation 10V.How I can convert voltage values to the force (Newtons)?When no force applied meter shows 0,06V and then i pressing with finger the max value I get is 0.7V.So how I can converts those volts to Newtons now?

Hello Forum, if we take a silicon solar cell, the open circuit voltage is about 0.5V. the current increases as the solar cell area and illumination increases. But the 0.5 V output voltage does not change as the area and illumination level vary...Why? It must have something to do with...

Homework Statement I've constructed a 5°x5° latitude/longitude cell, from 40-45° N and 85-90°W. This puts the center somewhere near the southern tip of Lake Michigan. I'm trying to find the average distance from the center of that cell (42.5°N, 87.5°W) to any other point in that cell...

Homework Statement Suggest a hypothesis to explain why algal and plant cells have cell walls. Suppose that mutant individuals from each group lacked a cell wall. How could you use these individuals to test your hypothesis? Homework Equations There aren't really... The Attempt at...

Homework Statement You want to create a tissue engineered blood vessel using smooth muscle cells. Your plan is to isolate smooth muscle cells from discarded human tissue obtained from heart surgery and grow them for a long time to create cells own ECM. Smooth muscle cells have enormous...

LOOKING FOR WEIGHT/MEASUREMENT DEVICE: DOES ANYONE HAVE ANY SUGGESTIONS? Please bear with me. I think the best way to present this is to post my RFQ and that will, I hope, explain what I am looking for. AN ALTERNATIVE TO A NORMAL LOAD CELL, WHICH WOULD HOPEFULLY BE MUCH CHEAPER, WOULD BE...

Homework Statement Find the translation vectors of the primitive cell. The figures are provided. Homework EquationsThe Attempt at a Solution I found these are more difficult than what I am learning from Kittel. I did number 1, but not sure if it is correct. Answer or hint for any of the...

I have been trying to understand how PV cells work in solar panels and have become a bit confused, here is what I have read so far: The PV cell is basically a PN junction diode with a conductive connection on the P and N material between this connection there is a load, a lamp for example...

Homework Statement The current-voltage characteristic of a photovoltaic energy converter (solar cell) shown in the attached figure can be approximated by: i = I_1(e^{v/V_{TH}} - 1) - I_2 where the first term characterizes the diode in the dark and I2 is a term that depends on light...

Homework Statement A customer is choosing between two cellular phone plans. One plan has a monthly fee of $50 for an allowance of 500 minutes per month. If the customer uses more than 500 minutes, the charge is $0.35 per additional minute used. The other plan has a monthly fee of...

Author: Bruce Alberts Title: Molecular Biology of the Cell Amazon Link: https://www.amazon.com/dp/0815341059/?tag=pfamazon01-20 Prerequisities: Contents:

Author: Bruce Alberts (Author), Dennis Bray (Author), Karen Hopkin (Author), Alexander Johnson (Author), Julian Lewis (Author), Martin Raff (Author), Keith Roberts (Author), Peter Walter (Author) Title: Essential Cell Biology Amazon Link...