In object-oriented computer programming, SOLID is a mnemonic acronym for five design principles intended to make software designs more understandable, flexible, and maintainable. The principles are a subset of many principles promoted by American software engineer and instructor Robert C. Martin, first introduced in his 2000 paper Design Principles and Design Patterns.The SOLID concepts are
The Single-responsibility principle: "There should never be more than one reason for a class to change." In other words, every class should have only one responsibility.
The Open–closed principle: "Software entities ... should be open for extension, but closed for modification."
The Liskov substitution principle: "Functions that use pointers or references to base classes must be able to use objects of derived classes without knowing it". See also design by contract.
The Interface segregation principle: "Many client-specific interfaces are better than one general-purpose interface."
The Dependency inversion principle: "Depend upon abstractions, [not] concretions."The SOLID acronym was introduced later, around 2004, by Michael Feathers.Although the SOLID principles apply to any object-oriented design, they can also form a core philosophy for methodologies such as agile development or adaptive software development.
How can we link the band gap to lattice spacing?
For (a), if we purely do dimension analysis, then I would guess $$a=\frac{\hbar c}{E_g}$$. But what's the reason behind this answer, and will the true lattice spacing be larger or smaller?
For (b), I guess $$\lambda=\frac{\hbar c}{E_g}$$ due to...
Water like glue
This topic could have more meaning on a chemistry forum.
Firts of telling my doupt, i will inform you why i put this question. My goal is controlling an obejct more accurately.
I notice that sometimes a solid with plain face on a wet surface is difficult to remove. Besides it...
TL;DR Summary: I need animations to understand physics better. Any links and animations would be very appreciated.
I have started learning Solid state physics and I am struggling somewhat to understand and imagine certain things. I feel like this is one area of physics which needs extensive...
Obviously, we know intuitively what they mean, but it seems that physicists have developed an objective definition for all of these.
If I were to guess, I'd say that:
- a gas is vastly less compressible than a liquid or solid (i.e., which are considered in thermodynamics as basically...
I am going over the diffraction condition section in Kittle's Introduction to Solid State Physics physics and I am having a hard time understanding why the phase difference angle for the incident wave is positive while the phase angle difference for the diffracted wave is negative. Thank you...
I tried to solve it considering the canonical ensemble (since the system is at the equilibrium with temperature T) and started finding the partition function:The problem is I am not sure if I have done it correctly and need help because I don't really know where to check.
In electron microscopy of thin solid specimens elastic scattering is treated as the main process responsible for formation of (phase contrast) images and diffraction patterns.
However, if an electron changes direction it should lose energy by producing a breaking radiation photon.
How can it be...
When radium atoms inside solid radium turn into radon do they stay in their lattice positions at room temperature or do they diffuse/tunnel to the surface?
I'm trying to investigate the possibility of martensitic transformation in a non-iron alloy, described as a single-phase alpha-solid-solution (Nickel-Silver CuNi12Zn25Pb1, CW404J). I know that Cu-Ni-Zn alloys with higher zinc amounts show even shape memory effects. And that CuNi12Zn25Pb1 is no...
Summary: In need of a textbook on solid mechanics
Hello,
I was asked to teach a class in FE analysis (this is not the issue) for solid mechanics (and, specifically, plane stress and strain)
The issue is that some students will be deficient in solid mechanics (long story, I will have the time...
So i think i am missing something pretty dumb, but anyway:
$$|\Delta P_{ressure}| = \rho_{s} g \Delta H$$
Claperyon equation:
$$\frac{\Delta P}{\Delta T} = \frac{\Delta L_{m}}{\Delta V_{m} T}$$
Equally both:
$$|\rho_{s}| = \frac{|\Delta T \Delta L_{m}|}{|\Delta H \Delta V_{m} g T|}$$
My...
Given a cylinder of height 2k with constant density and total mass M, and another object (for simplicity, a point mass) with mass m on the top of the cylinder; the force of gravitation is calculated between the centers of mass, which for the cylinder is at a distance k from the point mass...
In 3D period lattice, can we separate variable and write potential as V=V(x)+V(y)+V(z)?Then we can reduce the 3D problems into 1D problems. I ask this question because in Solid State Physics books they often consider the 1D problems.
The possible forms of solids can be more than just amorphous solids and crystalline solids. I tried a look at a couple of wikipedia articles and one of them showed descriptions of Plasticity, elastic, and Viscoelasticity, but those are not enough. I can only think to give some real world...
Hi! I've been trying to attempt this problem over here but the solutions state that the solution is this below?
However, from integrating the density and then plugging it into Gauss's law, I get the exact same thing, except a 15 instead of a 5. Could any please help point out if there is an...
Greetings All!
I have hard time to make the difference between the equation of a closed solid and a cartesian surface.
For example in the exercice n of the exam I thought that the equation was describing a closed solid " a paraboloid locked by an inclined plane (so I thought I could use...
I have the opportunity to get a Springer book for free, provided that it is cheaper than 200$. I am considering an introductory one about Solid State Physics, but I have never heard about a valid one from Springer (I know about Kittel, Ashcroft and Simon only). Do you have any suggestion?
Thank...
First, I tried to find the equation of line passing through (2, 0) and (0, 3) and I got ##y=3-\frac{3}{2}x##
Then I set up equation for the area of one slice, ##A(x)##
$$A(x)=\frac{1}{2} \pi r^2$$
$$=\frac{1}{2} \pi \left( \frac{1}{2}y\right)^2$$
$$=\frac{1}{2} \pi...
TL;DR Summary: Gerald Burns's book: Solid State Physics: is it good for begginers or there are best books?
Hello,
I am looking for the best book to study solid state physics for begginers. Some one recommended Gerald Burns's book: Solid State Physics. So, what is your opinions about this book...
I found this problem, which I thought was interesting and somewhat original:
Calculate the volume of the solid of revolution of the area between the line ##y = x## and the parabola ##y = x^2## from ##x = 0## to ##x = 1## when rotated about the axis ##y = x##.
I have a system, in which Reactor vent is connected to scrubber. Due to which reactor is under slight vacuum, ~400 mmWC
Solid is being charged to the reactor at a very low rate manually.
Is there any way to calculate approximate amount of solid which will get carryover to scrubber due to...
Owens - Wendt model is used for calculating surface energy on liquid - solid interface and it is given by following equation: $$ \gamma_{sl} = \gamma_s + \gamma_l -2(\sqrt {\gamma_l^d \gamma_s^d} + \sqrt {\gamma_l^p \gamma_s^p}) $$
So, if we use liquid and solid of known surface energy as well...
Summary:: We conducted the Marble Race experiment but the data of the time was lost. So I'm wondering if there's a workaround to at least put a rough estimate on it.
How long it would take for the marble that weights 6g with a density of 3.4 to cover a distance of 5.8cm passing through a...
I have a 3 phase problem that I think might be applicable to this forum. The setup is equipment which contains 5 resistive heaters (A through E). The unit is powered by 208V 3 phase and each of the heaters are hooked up line to line in an unbalanced configuration as follows:
L1-L2: Heater D...
I sketched this out. With the z=0 and y=0 boundaries, we are looking at ##z \geq 0## and ##y \geq 0##
I believe ##0 \leq x \leq 5## because of the boundary of ##y=\sqrt{25-x^2}##.
This is my region
##\int_0^5 \int_0^\sqrt{25-x^2} x \, dydx ##
## =\int_0^5 xy \vert_{0}^{\sqrt{25-x^2}} \, dx##...
The left pic is the initial state and the right pics are 2 different descriptions for a metal under electric field E. Are the 2 on the right contradictory and which is correct?
The actual problem can be found as #2 on this link: https://ocw.mit.edu/courses/mechanical-engineering/2-71-optics-spring-2009/assignments/MIT2_71S09_ups1.pdf
I rewrote the problem above with the solar irradiance data that they give.
My interpretation is of a square 1 m x 1 m plane sitting...
If there is some incoming light that has hit electrons of a N-type doped silicon and broke loose these electrons from their covalent bounds and excited them to the conduction band and also excited the electrons in the donor energy level to the conduction band as well, here we know that,
the...
If I assume the nebula is a circle, than the length of arc viewed from Earth is a half of the circumference. So, here
$$l = \frac{1}{2} \pi D$$
From the problem, ##D = 125 000 ly##.
Because the distance of nebula is much larger than the diameter; I try to approximate R with the distance of...
At first, I inverted the function(##f^{-1}(x)=g(x)##) and calculated the volume through the integral:
$$V=\pi\int_{0}^{4}[4-(2-g(x))^2]\ dx$$
but then I questioned myself if the same result could have been obtained without inverting the function.
To find such a strategy, I proceeded as follows...
First, I calculated the inverse of ##y=e^x## since we're talking about y-axis rotations, which is of course ##x=lny##.
Then, helping myself out with a drawing, I concluded that the total volume of the solid must've been:
$$V=\pi\int_{0}^{1}1^2 \ dy \ +(\pi\int_{1}^{e}1^2 \ dy \ - \pi...
Hi Everyone, can you guys please help me with the exercise attached?
I knot that according to the book, van der Waals interaction is “charge fluctuations in atoms due to zero point motion.”
This is correct once you understand that they are not talking about zero point motion of nuclear...
This was the answer key provided:
My questions are the following:
if the force required for rotational equilibrium is more than the limiting static friction, then the body will rotate aka slip over the surface. When it slips, the frictional force will be kinetic and not static, right?
If I...
This is the figure from the book. First of all, from what I know about diffraction, there is an interference pattern but not dispersion of the different colors. If what is happening here can be explained that would be great.
Second, the book says the line spectra for different gasses are due to...
What is the best books about the history of solid state physics?
I only found this:
Out of the Crystal Maze: Chapters from the History of Solid State Physics
by Lillian Hoddeson
Are there any other books?
Thanks for your suggestions
How much does a typical solid shrink when cooled from room temperature to absolute zero. I can't solve this myself because the coefficient of linear thermal expansion varies with temperature