Raman scattering is an inelastic scattering process that occurs when light interacts with molecular vibrations, phonons, or other low-frequency excitations in a material. This phenomenon is named after the Indian physicist C.V. Raman, who, along with his colleague, discovered it in 1928. In simple terms, when a monochromatic light source, typically a laser, shines on a sample, most of the light is elastically scattered, meaning it retains its original energy (or wavelength).

Scintillation in physics refers to the process by which certain materials emit flashes of light (or scintillation light) when they absorb ionizing radiation. This phenomenon is commonly observed in materials known as scintillators, which can be organic compounds, inorganic crystals, or even liquids. When a scintillator material is exposed to ionizing radiation (such as alpha particles, beta particles, or gamma rays), the incoming radiation interacts with the atoms of the scintillator, causing excitation and ionization.

Subsurface scattering (SSS) is a phenomenon in optics that occurs when light penetrates the surface of a translucent material, interacts with its internal structures, and then exits the material at a different location. This effect is particularly significant in materials that are not completely opaque and allow light to scatter within their volume, such as skin, wax, marble, and plants.

The Umkehr effect, also known as the "Umkehr phenomenon," refers to a specific spectral phenomenon in atmospheric science relating to the absorption of solar radiation by atmospheric gases, particularly ozone. The term "Umkehr" is derived from the German word meaning "reversal." This effect occurs during the scattering and absorption processes of sunlight in the atmosphere, where the distribution of ozone alters the vertical profile of solar radiation.

The effective radius of a cloud drop refers to a theoretical radius that represents the size of a droplet in a cloud based on its impact on certain physical properties, such as its scattering of light or its contribution to cloud microphysics. The effective radius is used in various fields, including meteorology and climate science, to simplify complex calculations and to understand the behavior of clouds.

The dynamic structure factor (DSF) is a key concept in condensed matter physics, particularly in studies of materials and collective excitations such as phonons, magnons, and other quasiparticles. It provides information about the microscopic dynamics of a system, including how density fluctuations evolve over time. Mathematically, the dynamic structure factor \( S(\mathbf{q}, \omega) \) is defined in terms of the Fourier transform of the time-dependent density-density correlation function.

Feshbach–Fano partitioning is a mathematical technique used in quantum mechanics, particularly in the context of scattering theory and the study of resonances. This method allows researchers to analyze and separate different contributions to the scattering amplitude in a way that makes it easier to understand the underlying physical processes. The method is named after Steven Feshbach and Ugo Fano, both of whom made significant contributions to the understanding of resonances and scattering in quantum systems.

Lindblad resonance refers to a phenomenon in astrophysics and celestial mechanics, particularly in the context of orbital dynamics in disks, such as those found in galaxies or around planetary systems. It describes a specific type of resonance that occurs when the orbital frequency of a body, such as a planet or moon, matches a certain integer multiple of the orbital frequency of density waves or other perturbations in the surrounding disk.

The Marchenko equations are a set of integral equations used in the mathematical and physical analysis of wave propagation, particularly in the field of scattering theory and inverse problems. They are named after the Russian mathematician Vladimir Marchenko. The Marchenko equations are typically used to reconstruct the potential in one-dimensional quantum mechanical systems from scattering data.

Neutron-acceptance diagram shading is a visual representation used in the context of neutron scattering experiments or neutron activation analysis. It helps in understanding the interactions between neutrons and matter, particularly focusing on how materials can absorb neutrons. This concept is often tied to nuclear physics and engineering, where understanding how different materials interact with neutrons is crucial for applications such as nuclear reactors, radiation shielding, and medical imaging.

Neutron time-of-flight (TOF) scattering is a powerful experimental technique used in condensed matter physics and materials science to investigate the structural and dynamical properties of materials. This technique involves the use of neutrons as probes, which have unique properties that make them particularly useful for studying atomic and subatomic structures.

The Linear Scheduling Method (LSM) is a project management technique used primarily in the construction industry for planning, scheduling, and managing linear projects, such as highways, pipelines, railways, and other linear infrastructures. The key feature of LSM is that it allows project managers to visualize the progress of construction activities over time and space.

Stimulated Raman Adiabatic Passage (STIRAP) is a technique used in quantum mechanics and quantum optics to achieve coherent population transfer between quantum states. It is particularly relevant in fields such as quantum computing, atomic physics, and molecular manipulation. ### Key Concepts of STIRAP: 1. **Quantum States**: STIRAP typically involves a three-level quantum system, which can be represented as states |1⟩, |2⟩, and |3⟩.

Processor scheduling algorithms are techniques used by operating systems to manage the execution of processes or threads on a CPU. Their primary goal is to efficiently utilize CPU resources, maximize throughput, minimize response and turnaround times, and ensure fairness among processes. Here's an overview of some key types of scheduling algorithms: ### 1. **Non-Preemptive Scheduling** In non-preemptive scheduling, a running process cannot be interrupted and must run to completion before another process can take over the CPU.

Diamond Light Source is the UK's national synchrotron X-ray source, located in Oxfordshire. It is a large-scale scientific facility that produces intense beams of light, known as synchrotron radiation, which are used for a variety of research applications across multiple scientific disciplines, including biology, chemistry, physics, materials science, and engineering.

EMMA, short for "Emerging Market Multinational Accelerator," is a program designed to support startups and companies operating in emerging markets. Its primary goal is to foster innovation, boost economic growth, and provide resources and mentorship to early-stage businesses in these markets. EMMA typically offers various resources, including: 1. **Mentorship:** Access to experienced entrepreneurs, industry experts, and business leaders who can provide guidance and support.

Event Chain Methodology (ECM) is a project management and risk management approach that focuses on understanding and modeling uncertainties, specifically those that can affect the timing and success of a project. The methodology emphasizes the identification of events that can trigger changes in the project schedule or resources and the ensuing domino effects these events can have. Key components of Event Chain Methodology include: 1. **Event Identification**: Recognizing potential events that could impact the project, such as risks, uncertainties, and dependencies.

Exponential backoff is a strategy used in network protocols and other systems to manage retries after a failure, particularly in situations where a resource is temporarily unavailable. The basic idea is to wait progressively longer intervals between successive attempts to perform an operation (such as sending a network request) after each failure, up to a predefined maximum time or retry limit.

FIFO stands for "First In, First Out." In computing and electronics, it is a method for managing data in queues and buffers where the first data element added to the queue is the first one to be removed. This approach is commonly used in various applications, including data storage, network packet management, and processing tasks in operating systems.