Photoluminescence excitation (PLE) is a technique used to investigate the electronic properties of materials, particularly semiconductors and quantum dots. In this method, a sample is illuminated with varying wavelengths of light (typically in the ultraviolet or visible range) to excite electrons from the valence band to the conduction band. As the sample absorbs photons, it can re-emit them at longer wavelengths, which is known as photoluminescence.
Henry T. Sampson is an American engineer, inventor, and academic known for his contributions to the fields of engineering and technology. He is particularly recognized for his work in developing the first practical industrial use of the gamma-electric cell, a device that converts radiation energy into electrical energy. Additionally, he has made significant contributions to issues of diversity and inclusion within the fields of engineering and technology.
Integral nonlinearity (INL) is a measure used in the context of analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) to quantify the deviation of the converter's actual output from the ideal output. It characterizes how linear or nonlinear the response of the converter is over its entire range.
The Lewis number (Le) is a dimensionless number used in fluid mechanics and heat transfer to characterize the relationship between thermal and mass diffusivities in a flowing system.
Russell Stannard is a British physicist and educator known for his work in the field of physics education and his contributions to the popularization of science. He has a background in theoretical physics and has been involved in various initiatives aimed at making complex scientific concepts more accessible to the general public. In addition to his academic work, he has authored several books and resources on physics and science communication.
Herbert G. MacPherson was a notable figure in the field of mathematics, particularly known for his contributions to mathematics education and research. His work often emphasized the importance of accessible and engaging mathematics instruction. However, if you're referring to something specific beyond the general profile, I might need more context to provide a more detailed or accurate description. Please clarify your question or provide additional information!
Toughening typically refers to a process or technique used to enhance the toughness of materials, allowing them to absorb more energy and resist fracture or failure. This can be applied in different contexts, such as in materials science, engineering, and even in biological systems. ### In Materials Science: 1. **Metals and Alloys**: Toughening processes may involve altering the microstructure of metals or alloys through heat treatment, alloying, or mechanical work to improve their toughness.
URL redirection, also known as URL forwarding, is a technique on the internet that automatically sends users from one URL to another. This process is commonly used for various reasons, including: 1. **Website Maintenance**: Redirecting users to a temporary page while a website is being updated or maintained.
UUNET is one of the early Internet service providers and was established in 1987. Originally, it was a division of the company UUNET Technologies, which provided networking and Internet services, including dial-up access, web hosting, and email services. UUNET was notable for being one of the first companies to offer commercial Internet services and played a vital role in the growth of the Internet, particularly in the United States.
As of my last knowledge update in October 2021, Antonio Castellanos Mata does not appear to be a widely recognized figure in public discourse or specific fields such as politics, entertainment, or science. It's possible that he is a lesser-known individual or that developments regarding him occurred after my last update.
Carmen Magallón is a Spanish physicist known for her work in the field of nuclear physics and for her contributions to the advancement of science communication and education. She has actively engaged in promoting scientific literacy and the importance of science in society.
Elliptic functions are a class of complex functions that are periodic in two directions, making them doubly periodic. This property is essential in many areas of mathematics, including number theory, algebraic geometry, and mathematical physics. Key characteristics of elliptic functions include: 1. **Doubly Periodic**: An elliptic function has two distinct periods, usually denoted as \(\omega_1\) and \(\omega_2\).
Zeta functions and L-functions are important concepts in number theory and have applications across various branches of mathematics, particularly in analytic number theory and algebraic geometry. ### Zeta Functions 1.
Edward Mills Purcell (1912–1997) was an American physicist best known for his work in the field of nuclear magnetic resonance (NMR) and its applications. In 1952, Purcell, along with Felix Bloch, independently discovered that atomic nuclei in a magnetic field can absorb and re-emit electromagnetic radiation.
A **lattice delay network** is a type of signal processing structure that is often used to implement filters, particularly in applications involving digital signal processing (DSP). The design is based on the concept of a lattice structure, which organizes the processing elements in a way that allows for the manipulation of delay elements and feedback paths. ### Key Features of Lattice Delay Networks: 1. **Lattice Structure**: The lattice network consists of a series of processing elements organized in a lattice formation.
The Nyquist ISI (Inter-Symbol Interference) criterion is a fundamental principle in communication systems that addresses the issue of inter-symbol interference in pulse transmission. It provides a set of guidelines to minimize ISI, which occurs when the transmitted signal spreads over time and overlaps with subsequent symbols, thereby distorting the received signal and making it difficult to discern individual symbols.