nucleation

简明释义

英[ˌnjuːklɪˈeɪʃən]美[ˌnjʊklɪˈeʃən]

n. [生化] 成核现象；集结；人工降雨作用

英英释义

单词用法

同义词

反义词

例句

1.The supersaturation used is too low to produce an appreciable rate of nucleation.

所用的过饱和度太低，不能产生一个值得重视的成核率。

2.A new dynamic recrystallization model consisting of particle-stimulated nucleation and sub-grain rotated-induced nucleation was proposed.

为此，提出了一种新的粒子激发形核与亚晶倾转形核长大的混合再结晶模式。

3.A great impact of surface diffusion on CVD diamond nucleation is discovered and investigated.

发现和研究了表面扩散对CVD金刚石成核的重要影响。

4.Their growth mechanism could be explained by symmetrical nucleation and growth model.

其生长机理可以用对称性的形核生长模型来解释。

5.Continuous nucleation model is applied to describe heterogeneous nucleation in liquid metal.

采用连续形核模型来描述液相中的自发形核。

6.The relationship between nucleation temperature and flexural strength was investigated.

探讨了核化温度与抗弯强度之间的关系。

7.On the basis of discussion for nucleation mechanism of ammonium molybdate, the crystallized nucleation rate of AQM at different speed.

在讨论钼酸铵成核机理的基础上，研究了不同酸化速度下四钼酸铵(AQM)结晶的成核速率。

8.The mechanism of negative bias enhanced diamond nucleation is emphatically analyzed.

着重分析了负衬底偏压增强金刚石核化的机制。

9.Effects of the specific pressure on nucleation rate and linear growth velocity were expounded in squeeze casting.

阐述了挤压铸造比压对形核率及成长线速度的影响。

10.The process of ice formation begins with the nucleation 成核 of small ice crystals in the atmosphere.

冰的形成过程始于小冰晶在大气中的成核。

11.In metallurgy, nucleation 成核 is critical for the formation of desired microstructures in metals.

在冶金中，成核对金属所需微观结构的形成至关重要。

12.During the cooling process, nucleation 成核 plays a key role in crystallization.

在冷却过程中，成核在结晶中起着关键作用。

13.Bubble formation in boiling water is an example of nucleation 成核 occurring at the surface.

沸水中的气泡形成是表面发生的成核的一个例子。

14.The study of nucleation 成核 helps scientists understand how clouds form.

对成核的研究帮助科学家理解云是如何形成的。

作文

Nucleation is a fundamental process in various scientific fields, particularly in physics, chemistry, and materials science. It refers to the initial stage of phase transition, where small clusters or 'nuclei' of a new phase form within a parent phase. This process is crucial for understanding phenomena such as crystallization, condensation, and even the formation of clouds in meteorology. To better grasp the concept of nucleation (成核), we can explore its mechanisms, applications, and significance in everyday life. In the context of crystallization, nucleation (成核) occurs when a few molecules or atoms come together to form a stable cluster. This cluster acts as a nucleus from which larger crystals can grow. The conditions under which nucleation (成核) happens depend on various factors, including temperature, pressure, and the presence of impurities. For instance, in the production of ice, when water is cooled below its freezing point, tiny ice crystals begin to form through nucleation (成核). These initial crystals can then grow, leading to the formation of larger ice structures. There are two main types of nucleation (成核): homogeneous and heterogeneous. Homogeneous nucleation (成核) occurs uniformly throughout the parent phase, while heterogeneous nucleation (成核) takes place on surfaces or interfaces, such as dust particles in the air or the walls of a container. Heterogeneous nucleation (成核) is generally more common because it requires less energy than homogeneous nucleation (成核). Understanding these types helps scientists and engineers control processes in industries like pharmaceuticals, where crystal size and purity are critical. In the realm of materials science, nucleation (成核) plays a vital role in the development of new materials. For example, during the solidification of metals, nucleation (成核) influences the microstructure and properties of the final product. By manipulating nucleation (成核) conditions, researchers can create stronger, lighter, and more durable materials suitable for various applications, from aerospace to biomedical devices. Moreover, nucleation (成核) is not limited to solid-to-liquid transitions; it also occurs in gas-to-liquid transitions. In meteorology, cloud formation is a classic example of this phenomenon. Water vapor in the atmosphere condenses around tiny particles such as dust or salt, initiating the process of nucleation (成核). As more water vapor condenses, droplets grow larger, eventually leading to precipitation. This natural process is essential for the Earth's water cycle and has significant implications for weather patterns and climate. In conclusion, nucleation (成核) is a critical process that underlies many physical and chemical transformations. Its understanding is not only vital for scientific research but also for practical applications across various industries. From the formation of ice crystals to the development of advanced materials, nucleation (成核) affects our daily lives in numerous ways. As we continue to explore the intricacies of this process, we unlock new possibilities for innovation and technology, ultimately enhancing our understanding of the natural world.

成核是各种科学领域中的一个基本过程，特别是在物理、化学和材料科学中。它指的是相变的初始阶段，其中小簇或“核”在母相内形成。这个过程对于理解结晶、凝结甚至气象学中云的形成等现象至关重要。为了更好地掌握成核（nucleation）的概念，我们可以探索其机制、应用和在日常生活中的重要性。 在结晶的背景下，成核（nucleation）发生在一些分子或原子聚集在一起形成一个稳定的簇时。这个簇充当了一个核，从中可以生长出更大的晶体。成核（nucleation）发生的条件取决于多种因素，包括温度、压力和杂质的存在。例如，在冰的生产中，当水被冷却到其冰点以下时，微小的冰晶开始通过成核（nucleation）形成。这些初始晶体随后可以生长，从而导致更大的冰结构的形成。 成核（nucleation）主要有两种类型：均匀成核和非均匀成核。均匀成核（nucleation）在母相中均匀发生，而非均匀成核（nucleation）则发生在表面或界面上，例如空气中的尘埃颗粒或容器的壁。非均匀成核（nucleation）通常更为常见，因为它所需的能量比均匀成核（nucleation）少。理解这些类型有助于科学家和工程师控制制药等行业中的过程，其中晶体的大小和纯度至关重要。 在材料科学领域，成核（nucleation）在新材料的发展中发挥着重要作用。例如，在金属的固化过程中，成核（nucleation）影响最终产品的微观结构和性能。通过操控成核（nucleation）条件，研究人员可以创造出更强、更轻、更耐用的材料，适用于从航空航天到生物医学设备的各种应用。 此外，成核（nucleation）不仅限于固体到液体的转变；它也发生在气体到液体的转变中。在气象学中，云的形成就是这一现象的经典例子。大气中的水蒸气在如尘埃或盐这样的微小颗粒周围凝结，启动成核（nucleation）过程。随着更多水蒸气的凝结，水滴变得更大，最终导致降水。这个自然过程对于地球的水循环至关重要，并对天气模式和气候产生重大影响。 总之，成核（nucleation）是一个关键过程，基础于许多物理和化学转变。理解这一过程不仅对科学研究至关重要，还对各个行业的实际应用至关重要。从冰晶的形成到先进材料的发展，成核（nucleation）在我们日常生活中以多种方式产生影响。随着我们继续探索这一过程的复杂性，我们开启了创新和技术的新可能性，最终增强了我们对自然世界的理解。