Cell Definition and 899 Threads

So I usually use VESTA to make my figures, and though the new version is able to do many mad things with calculated electron density isostructures and whatnot, I can't seem to just be able to throw in some clover-leaf d or p orbitals like what was done in the image below (from this paper on...

I am now waiting to go uni after alvls. I am interested to do research about solar cell. which engineering program should I take? elelctrical, mechanical?? if my uni offer me electronics in optical engineering, should I go if I wan to research in solar cell??

I am trying to have students build a tester with sourceMeter, lamp, etc. for solar cell efficiency measurement. Could someone give me advice on this project? Thank you very much.

I will admit that I still have a bit of trouble when it comes to reading the table of standard electrode potentials. (Though, I do think my understanding is improving.) However, unless I am mistaken, should not Daniell cells (zinc anode, copper cathode, sulfate solutions) not rechargeable...

I am trying to use a 0-5000 lb load cell with an Arduino. My issue is the 10 bit input on the Arduino. The load cell will actually be pre-loaded to about 3800 lbs. I just need to measure up to a couple hundred pounds difference. The load cell is a standard 4 wire and measures the difference...

My question is basically how can a solar cell operate in forward bias? A normal diode in forward bias (with a battery connected) drives electrons from the N-side towards the pn junction where they are continuously recombining with holes (reducing the depletion zone and allowing for the flow...

How to prove there is no primitive cell of diamond structure with only one atom? Thanks in advance!

How can i develop a sketch of the lattice and reciprocal lattice from vector form a=i+4j b=3i i know how to draw the wigner site cell, but I am having problems developing a sketch from vectors. what is the method for working it out..please help

That is what is on my mind after reading this article: http://healthland.time.com/2011/08/11/mit-scientists-develop-a-drug-to-fight-any-viral-infection/

Hi to all experts! I know individually about primitive cell("It has lattice point at corners only") and unit cell("It has lattice point at corners as well as at center if bcc or at faces if fcc or at bases if it is base centered") Are these right? But I don't know what is Wigner-Seitz cell...

I remember reading on this forum (probably) about how it was physically impossible for cell phones to cause damage to DNA. A microwave photon has energy in the meV range. My biology and chemistry aren't all that great, and what little I could properly google gave me the idea that molecular bonds...

i want to generate electricity from piezoelectric load cell by application of load on it, but i don't know which type of cell to use and from where to get it? i want good efficiency, please help me out.

As electrons leave one half of a galvanic cell and flow to the other, a difference in charge is established. If no salt bridge were used, this charge difference would prevent further flow of electrons. Why would the charge difference prevent further flow of electrons ??

Hypothetically, could the transmitter-receiver systems in cell phones communicate directly among other such systems at a range comparable to the range they can communicate with towers? With 4G bandwidth?

I have received conflicting information from the internet regaurding cell phone/mobile phone communication. Some articles site radio waves and others microwaves and still others mix the two when trying to explain the signals used by cell phones/mobile phones? What am I missing? I did some...

Homework Statement Albinism in humans is controlled by a recessive allele. How many copies of this allele will be found at one of the poles of a cell at telophase I of meiosis in an albino person. A.23 B.4 C.2 D.1 Homework Equations The Attempt at a Solution Let rr be the recessive...

The cytoskeletal structures were considered responsible for the elementary cellular intelligence in the past. (For example, see the articles from Albrecht Buehler. http://www.basic.northwestern.edu/g-buehler/FRAME.HTM.) Microtubules are pipe-like structures made of two kinds of proteins...

Greetings everyone, I'm constructing a ferrofluid display cell using FerroTech EFH1 ferrofluid inside of a round bottom pyrex beaker. The ferrofluid is oil based, so it is not hydrophilic. The liquid that the ferrofluid will be suspended in is Magnesium Citrate (a household laxative... and no...

"D" cell battery gets hot As a hobbyist, I was playing around with an MP3 player that uses a single alkaline AAA battery. I wanted to see if the player would still work if I attached a "D" cell battery to the device. I went to Radio Shack and puchased a "D" cell battery holder which has two...

The bio department at my university encouraged that I "take a look at" Alberts' Molecular Biology of the Cell over this summer in preparation for a course next year. The problem with this is that I don't want to actually buy a $100+ book just for that, but the only book I have borrowing access...

What is the different between thin-film PV cell and crystalline silicon PV cell? Are they using the same material but just differ in the fabrication process? Does a multi-junction PV cell belongs to thin-film or crystalline type?

Hi I have simulated a dual junction(Multijunction) solar cell of thickness 10 microns and length 20 microns in silvaco atlas device simulator. In order to calculate its efficiency i need exact value of incident solar power i.e Pin for the above said structure. These are the parameters...

Homework Statement What voltage must be applied to decrease the mass of Ag(s) in the electrolytic cell reaction below? 2 Ag+(aq) + Cd(s) → 2 Ag(s) + Cd2+(aq) Homework Equations Standard reduction potential of Ag+: Eo = +0.80 V Standard reduction potential of Cd2+: Eo = -0.40 V...

Homework Statement let's say we have an electrochemical cell composed of 2 cups each cup contain a metal and the ions of that metal and an acidic componment like H2so4 the two cups arent attached with any kind of conductor if we try to measure the voltage with a voltmeter would it detect...

Has anyone built a hydrogen cell using nafion?

I believe I have an understanding of the proper design for a Couette cell. If I am incorrect, please let me know. Two concentric cylinders, the internal one rotating, the external one static. 1.) If I have a rotating cylinder with a diameter of 28.64789 mm and a static one with a diameter...

Homework Statement http://meinprojekt.hostzi.com/images/Picture2.jpg We did an experiment to measure E mf or the cell voltage of bateries. A thin wire (slide-wire potentiometer) is connected into the circuit. From point a to c the resistance along the wire is 36 Ohm. Depending on where the...

Homework Statement Unit cell of a crystal lattice is a parallelepiped spanned by the vectors u, v, w vectors have lengths of 1, 2 resp3 (le). angles between the vectors is [u, v] = pi / 4 [u, w] = pi / 3 [v, w] = pi / 6 Determine the volume of the unit cell. Homework Equations How do...

Homework Statement A voitaic cell consists of a Zn/Zn^2+ half-cell and Ni/Ni^2+ half-cell at 25C. The initial concentration of Ni^2+ and Zn^2+ are 1.50M and .100M respectively. What are the concentrations of Ni2+ and Zn2+ when the cell potential falls to 0.45V? Homework Equations...

hello everyone hopefully i make use of this forum "We now have an explanation of why carbohydrates is always found on the outside surface of the plasma membrane. It is because the carbohydrate was originally added by enzymes in the lumen of the ER, and membrane asymmetry is preserved when...

I ran an experiment in which a Daniell Cell (using Cu and Mg electrodes with Cu Nitrate and Mg Nitrate as the electrolytes (both 0.1mol)) was heated on both sides by using two beakers filled with water, the water that heated the cell was heated to about 92C and then left to cool. The experiment...

What causes the A-band to be dark in a sarcomere? Conversly, what causes the I-Band to be light?

hi there, do anyone here try to start car engine with dry cell(Nickel/cadmium (NiCd)? How many dry cell need to be use if we insist to start the engine with it?

Hello, I have an upcoming exam on human genetics and genetic techniques and I am trying to learn about this procedure. I have searched the internet but come up with more studies that have used this technique rather than a plain 'for dummies' explanation of what it is. If someone could offer...

Could one really big hydrogen fuel cell battery replace a nuclear reactor in providing power to millions of people? This may end up being a safer option for generating power.

I am thinking about buying a great house, however there is a cell phone tower less than 500 ft. away. I know everybody says there is nothing to worry about, but I have found some articles on the internet that do show some adverse health effects living so close to a cell phone tower. Could...

I don't know much about antennas, but I've seen descriptions of the field around dipole antennas that make a difference between the "near field" and the "far field", where the far field is more or less a pure radiation field of photons traveling away from the source, and the near field more like...

Homework Statement A cell is connected to a 10.0 Ohm resistor. The pd across the 10.0 Ohm resistor is 10.43 V. A 4.00 Ohm resistor is connected in parallel with the 10.0 Ohm resistor. The pd across the 10.0 Ohm resistor falls to 7.87 V. Calculate the emf and the internal resistance of the...

Cell Biology -- Devising Experiments Homework Statement I've included a picture of the problem to avoid confusion 2. The attempt at a solution I need to devise an experiment that would confirm the 3 statements. By experiements, it means something along the line of DNAase II sensitivity...

Has anyone read this book; Disconnect: The Truth about Cell Phone Radiation? Is this a credible book? Thanks

Homework Statement Consider a Galvanic Cell composed of one half-cell containing 0.050 M copper(II) sulfate with a copper electrode and another half-cell containing an unknown concentration of aluminum chloride, AlCl3, and an aluminum electrode. a. Write the Nernst equation for this...

Hi, I'm considering buying a home on a hill that has a cellular tower a eye level with the kitchen room window. The antennas (6) are about 30 feet from the window. The antennas for the most part are directed outward toward the valley. Does this pose a potential health problem? I'd...

How is the distance between any two layers in a FCC unit cell equal to a/√3, where a is the edge length? I think it should be a/2 because the distance of a face centered atom from any 4 edges surrounding it is a/2. Can someone explain it geometrically?

in defining cell you can use '#' but i read some where use this operator slowing your computation but i think mcnp at first chage your code and transform this oprator by use of (':' & ' ') and build new code then start to computation to prevent it , are you know about this subject?

Aluminum has a density of 2.699 g/cm3 , and the atoms are packed in a face-centered cubic crystal lattice. Find the mass of a unit cell. -----I already know the answer is 1.792*10^-22g/unit cell I have a question about how you get the answer: I know you multiply 4.480*10^-23g * 4 atoms/1...

In normal chemical cells, the electrodes are two different metals so that the more reactive one gives off electrons and create a flow of electrons and hence electricity. [the electrolyte is say NaOH aq or whatever] Just wondering - is it possible to have a chemical cell consisting of: a)...

Hi. As part of my as physics work i have to calculate the 'cell current', but we haven't covered this in class. I have searched on google but nothing has come up. If somebody could point me in the right direction, i'd appreciate it. Thanks.

what is difference between an electric cell and a battery?

In an emergency could scattered cell phones form a communications network if properly programed without need for relay towers? I'm guessing such a system might have severe limitations but if the software was built in it might be an inexpensive way to keep communications going during an...

If I have the fractional coordinates of asymmetric unit and I know the space group of certain material, is there an easy way to generate the fractional coordinates of the atoms in the conventional unit cell?