permittivity

简明释义

英[ˌpɜːmɪˈtɪvɪtɪ]美[ˌpɜːrmɪˈtɪvəti]

n. [电] 介电常数，[电] 电容率

复 数 p e r m i t t i v i t i e s

英英释义

单词用法

同义词

反义词

例句

1.The characteristic time of electrostatic equilibrium process in decided by conductivity and permittivity of material.

静电平衡过程的特征时间由物质的电导率和电容率决定。

2.This is the permittivity of vacuum.

真空中的介电常数是。

3.Negative refractive material is an important and new-style artificial and composite material, in which permittivity and permeability are simultaneously negative.

负折射率材料是一种重要的新型人工合成材料，其主要特征是介电常数和磁导率都小于零。

4.Based on the model of granular media, the calculating method of permittivity and permeability for compound ferrite absorption materials is studied.

基于颗粒混合媒质的模型，本文讨论了复合铁氧体吸波材料介电常数和磁导率的计算方法。

5.The complex transcendental equation will be usually encountered in measuring material permittivity.

测量复介电常数时通常会得到一个复超越方程。

6.The mathematical model of the Lamb wave sensor was established on the basis of the partial wave theory and the surface effective permittivity method.

以部分波理论和表面有效介电常数方法为基础，建立了兰姆波传感器的数学模型。

7.The reflected GPS signal as a function of permittivity relates to the soil moisture.

反射gps信号功率是土壤介电常数的函数，而土壤介电常数又和土壤湿度有关。

8.Compared with regular material, it has some unusual parameters value, simultaneously negative permeability and permittivity.

与常规材料相反，它具有同时为负的介电常数和磁导率，进而具有负的折射系数。

9.Malignant tissues have higher permittivity and conductivity and therefore appear differently than normal ones to a screen.

恶性组织有较高的透电率和传导率，因此在屏幕与正常组织比表现不同。

10.The permittivity of a material determines how much electric field is generated per unit charge.

材料的介电常数决定了每单位电荷产生的电场强度。

11.The permittivity of a substance can change with temperature and frequency.

物质的介电常数可能会随着温度和频率的变化而变化。

12.High permittivity materials are often used in capacitors to increase their capacitance.

高介电常数材料通常用于电容器，以增加其电容值。

13.The permittivity of free space is a fundamental constant in electromagnetism.

自由空间的介电常数是电磁学中的一个基本常数。

14.In microwave engineering, understanding the permittivity of dielectrics is crucial for designing antennas.

在微波工程中，理解介质的介电常数对天线设计至关重要。

作文

In the field of electromagnetism, the concept of permittivity plays a crucial role in understanding how electric fields interact with materials. Defined as a measure of how much electric field is 'permitted' to pass through a medium, permittivity is a fundamental property that affects the behavior of capacitors, transmission lines, and various other electronic components. The higher the permittivity of a material, the more easily it can store electrical energy in an electric field. This characteristic is essential for designing efficient electronic circuits and understanding how they function under different conditions.The permittivity of free space, often denoted by the symbol ε₀ (epsilon naught), is approximately 8.854 x 10⁻¹² F/m (farads per meter). This constant serves as a baseline for comparing the permittivity of other materials. When a dielectric material is introduced into an electric field, its permittivity increases, which can significantly enhance the capacitance of a capacitor. For example, if we take a parallel plate capacitor and insert a dielectric material between the plates, the overall capacitance can increase by a factor equal to the material's relative permittivity, also known as the dielectric constant.Understanding permittivity is not only important for theoretical physics but also for practical applications in engineering. Engineers rely on this property when designing devices such as smartphones, computers, and other electronic gadgets. For instance, the choice of materials used in the construction of circuit boards often depends on their permittivity values. Materials with high permittivity are preferred in areas where signal integrity is critical because they can help minimize signal loss and improve performance.Moreover, the permittivity of materials can vary with frequency, temperature, and other environmental factors. This variability can affect how signals propagate through different media, making it essential for engineers to consider these factors during the design phase. In radio frequency applications, for example, understanding the permittivity of the materials used in antennas can lead to better performance and efficiency in transmitting and receiving signals.In summary, permittivity is a fundamental property that describes how electric fields interact with materials. Its significance spans across various fields, including physics, engineering, and technology. By grasping the concept of permittivity, one can better appreciate the intricacies of electronic devices and their designs. As technology continues to advance, the importance of understanding permittivity will only grow, paving the way for innovations that rely on the effective manipulation of electric fields in various mediums.

在电磁学领域，介电常数的概念在理解电场如何与材料相互作用方面发挥着至关重要的作用。介电常数被定义为电场通过介质的“允许”程度，是影响电容器、传输线和其他各种电子元件行为的基本属性。材料的介电常数越高，电场中存储电能的能力就越强。这一特性对于设计高效的电子电路以及理解它们在不同条件下的工作方式至关重要。自由空间的介电常数，通常用符号ε₀（小写希腊字母epsilon）表示，约为8.854 x 10⁻¹² F/m（法拉每米）。这个常数作为比较其他材料介电常数的基准。当在电场中引入介电材料时，其介电常数会增加，这可以显著增强电容器的电容。例如，如果我们取一个平行板电容器并在板之间插入一个介电材料，则整体电容可以增加一个等于该材料相对介电常数（也称为介电常数）的因子。理解介电常数不仅对理论物理学重要，对工程中的实际应用同样重要。工程师在设计智能手机、计算机和其他电子设备时依赖于这一属性。例如，电路板制造中所用材料的选择通常取决于其介电常数值。在信号完整性至关重要的领域，通常会优先选择具有高介电常数的材料，因为它们可以帮助最小化信号损耗并提高性能。此外，材料的介电常数可能会随频率、温度和其他环境因素而变化。这种可变性可能会影响信号在不同介质中的传播方式，因此工程师在设计阶段必须考虑这些因素。在射频应用中，例如，了解天线使用材料的介电常数可以导致更好的性能和效率，以便在传输和接收信号时。总之，介电常数是描述电场如何与材料相互作用的基本属性。它的重要性跨越了物理学、工程学和技术等多个领域。通过掌握介电常数的概念，人们可以更好地理解电子设备及其设计的复杂性。随着技术的不断发展，理解介电常数的重要性只会增加，为有效操纵各种介质中的电场铺平道路，从而推动创新。