哈梅克理论（物理学）

普朗克轨迹是白炽灯黑体辐射器的颜色随其温度变化在色度空间中的变化路径。它通常绘制在CIE 1931 xy色度图上，呈现为一条从红橙色区域到蓝白色区域的圆弧。它是定义色温的基本参考。

紫外线光谱通常细分为UVA（400-315纳米）、UVB（315-280纳米）和UVC（280-100纳米）。UVA，即长波紫外线，能量最低，穿透皮肤最深。UVB，即中波紫外线，会导致晒伤，对维生素D的合成至关重要。UVC，即短波紫外线，能量最高，具有杀菌作用，但会被地球大气层完全吸收。

Discovered in 1933 by Walther Meissner and Robert Ochsenfeld, the Meissner effect is the expulsion of a magnetic field from a superconductor during its transition to the superconducting state. When a material is cooled below its critical temperature ([latex]T_c[/latex]) in the presence of a weak external magnetic field, it actively cancels all magnetic flux inside it, becoming a perfect diamagnet.

太阳能电池的核心是pn结，即p型和n型半导体材料之间的界面。该结在耗尽区产生内置电场。当具有足够能量的光子撞击半导体时，它们会形成电子-空穴对。电场将这些载流子分离，驱动电子向n侧移动，空穴向p侧移动，从而产生电压。

魏森伯格效应是粘弹性流体中的一种现象，流体会沿着插入其中的旋转杆向上攀爬。这与牛顿流体的行为相反，牛顿流体在离心力的作用下向外推，形成涡流。这种效应是由流体在剪切作用下产生的法向应力差引起的。

Digital circuits are categorized into two main types: combinational and sequential logic. In combinational logic, the output is a pure function of the present input values only (e.g., an adder). In sequential logic, the output depends not only on the current inputs but also on the past sequence of inputs, as these circuits have memory elements (e.g., a flip-flop).

相关色温 (CCT) 是衡量非理想黑体辐射光源（例如 LED 或荧光灯）色温的指标。它是指与光源颜色感知最接近的普朗克辐射体的温度。这种“接近度”是通过在普朗克轨迹上找到距离光源色度坐标最近的点来确定的。

完美反射漫射体，也称为完美白光，是一种理论上的理想表面，在比色法和分光光度法中用作参考标准。其定义为能够 100% 反射可见光谱中所有波长的入射光，并实现完美漫反射（朗伯反射）的表面，这意味着其亮度在任何视角下都均匀一致。

A superacid is an acid with an acidity greater than that of 100% pure sulfuric acid. The conventional pH scale is inadequate for these media. Instead, their acidity is measured using the Hammett acidity function, [latex]H_0[/latex]. This function is based on the protonation of weak indicator bases and is defined as [latex]H_0 = pK_{BH^+} - \log\left(\frac{[BH^+]}{[B]}}\right)[/latex].

蒽醌法工艺开发于20世纪30年代，是生产过氧化氢的主要工业方法。该工艺首先将蒽醌衍生物加氢生成蒽氢醌，然后用空气氧化蒽醌，再生出原始蒽醌并生成过氧化氢。之后，用水提取过氧化氢并浓缩，形成一个连续高效的循环。

氧化态，或称氧化数，是指假设一个原子与不同原子的所有键均为100%离子键时，该原子所带的电荷。它提供了一种追踪氧化还原反应中电子转移的方法。氧化态升高表示氧化，氧化态降低表示还原。这种形式简化了复杂化学反应的分析。

Thermate is an incendiary composition that enhances standard thermite. It is typically a mixture of thermite, barium nitrate ([latex]Ba(NO_3)_2[/latex]), and sulfur. The barium nitrate acts as an oxidizer, increasing the thermal output and making the reaction less dependent on atmospheric oxygen. Sulfur is added primarily to lower the ignition temperature, making the mixture easier and more reliably ignited.

塑性理论描述固体材料在外力作用下发生不可逆形状变化的现象。与弹性力学不同，弹性力学中变形在卸载后会恢复，而塑性变形是永久性的。塑性理论包含屈服准则（用于定义塑性开始）、流动法则（用于描述塑性应变的演变）以及硬化法则。

The bathtub curve is a graphical model illustrating three phases of a product's life in terms of failure rate. It starts with a high but decreasing 'infant mortality' rate, followed by a low, constant 'useful life' rate, and concludes with an increasing 'wear-out' rate. MTBF calculations using a constant failure rate ([latex]\lambda[/latex]) are typically only valid during the central 'useful life' phase.