Hi guys, this is Minghao Zhang, aka Tiger / 2LalA猪. I am an graduate scientist at Cambridge.
ButterAddict is not only the title of my leisure blogging site, but also a life philosophy.
I tasted alkali in dream, and then had acid reflux the next morning…
If there is a causality here, whichever being the chicken whichever
being the egg, it is very, VERY CREEPY.
It seems peculiar that the revision time before Tripos triggers my
programming crave, every year. It was the Tripos question bank website
in year 1, … something that I’ve forgotten in year 2…, and this year,
updating my website for the IndieWeb concept.
Learning about IndieWeb
I was searching for...
Langmuir adsorption
To illustrate the difference in choices of ensembles.
Canonical ensemble
Find the partition function from the number of ways to distribute
\[
\Omega(N)=\frac{M!}{N!(M-N)!}\\
\implies Q=\frac{M!}{N!(M-N)!}\exp(\beta N\epsilon)
\] With Stirling’s approximation, chemical potentia...
Fundamental idea
Think about thermodynamics
The observable properties of systems containing very large numbers of
particles depend only on specifying a few macroscopic properties -
internal energy, temperature, volume, pressure, density, etc.
Most experiments measure averaged properties - over ma...
Rigorous maths is not essential for the sake of this course, so that
will only be added later if required.
Diffraction
Geometry
Symbol
Meaning
\(\mathbf{r}\)
Position
\(\mathbf{s_0}\)
Unit vector of incident beam
\(\mathbf{s}\)
Unit vector of diffracted beam
\(\mathbf{S=(s-s_0)}/\lam...
It should be obvious but 主题是针对英国。如果没有了解政府进入Stage
II的措施以及理由，在最后附了摘要。（Credit: LZH）
为什么不
在质疑一个人“为什么不”之前，如果你没有站在他的立场上思考一下为什么不，那这个质疑是极不负责任的。
一场瘟疫面前，政府为什么不轻举妄动的理由很多，大家也都能慢慢看到了。最近的例子，美国一封闭欧洲的航班，DJI就暴跌10%。这说明从经济上看，任何的封闭性措施，至少在大多数人（资本）看来，在短期内都会对经济造成更加负面的、极其严重的影响。
同样的，在其他方面，任何措施对国家、社会的影响都不可小觑。多少小企业就此破产、多少投...
Cambridge Part II B7 course.
Representations
The representation matrix of an operation is defined with a
left contraction \[
\hat{R}\phi_i=\sum_j \phi_j D_{ji}(R).
\]
Great Orthogonality Theorem
If \(\Gamma_a\) and \(\Gamma_b\) are two irreducible unitary
representations, then their representatio...
Key equations (need to remember) for Cambridge Part II Theoretical
techniques course.
Huckel
The resonance energy is the difference between total
Huckel energy and the summed energies of isolated bonds in the
structure.
Cyclic polyenes
Energy - this is equivalent to drawing a Frost circle! \[\beg...
A brief note on the use of enolates in syntheses.
Enolate alkylation
Condition overview
By electrophile
Electrophile type
Conditions
Note
Activated R-X
Best with enamines1. \(\ce{R2NH},\
\rm{cat\ }\ce{H+}\)2. \(\ce{R-X}\)3. \(\ce{H+}\)
Tertiary R-X
Lewis acid to form cation\(\ce{Ti...
