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# Numpy and Pandas and Matplotlib

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Numpy array的简单创建 import numpy as np arr1 = np.array([[1, 2, 3], [1, 2, 3]]) # list转为array print(arr1) print(arr1.shape) # (2, 3) #元组 """输出： [[1 2 3] [1 2 3]] 注意：下面的写法会报错，不能直接在代码中通过赋值的方式创建一个array变量 a = [[1 2 3] [1 2 3]] """ arr2 = np.array([1, 2, 3, 4, 5, 6,…

# 芯片简史

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John Ambrose Fleming (约翰·弗莱明)：In 1904, working for the Marconi company to improve transatlantic radio reception, Fleming invented the first thermionic vacuum tube, the two-electrode diode, which he called the oscillation valve, for which he received a patent on 16 November. This invention of the vacuum tube…

# 半导体物理-柴常春

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# 计算机网络

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# 图论

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transition matrix equilibrium state adjacency matrix $$A v=\lambda v$$   有从A指向B的箭头，则说明有a non-zero transition probability from state A to state B. we leave state 0 and we never come back again.   The probability of revisiting state 0 in a random walk that started from state 0 is…

# 矩阵-不可约表示

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irreducible representations: the basic building block for symmetry of the point group. block diagonalization. https://mattlawgroup.org/inorganic-chemistry-chem-107/ 【可约矩阵】(reducible matrix): An $$n \times n$$ matrix $$A$$ is said to be a reducible matrix if and only if for some permutation matrix $$P$$, the matrix $$P^T A P$$ is block upper…

# 单词

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diplomatic Rift 外交裂痕 Sikh separatist 锡克教分裂分子 gun down  用枪射击（某人） tit-tor-tat (response) 以牙还牙，针锋相对 accountability 责任，责任心，可说明性 uphold our values 坚持我们的价值观 Delhi 德里 conflagration  大火，冲突 sweet spot  体育用语中球棒、球拍或球杆头部的最有效部分；最理想的位置或条件 Global South 全球南方：指位于非洲、拉丁美洲以及亚洲发展中国家的一组国家 clash against 猛撞（某物）与……不协调与……（意见）不一致与……冲突 tight-lipped 守口如瓶的；紧闭嘴巴的；寡言的 heavily discounted Russian oil  大幅打折的俄罗斯石油 has ruffled the feathers of western powers 惹毛了西方的羽毛 steadfast 忠诚的，坚定的…

# 过渡态

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