PSD can stand for:

Politics

PSDs stand for Private Safety Details

• Social Democratic Party, a political party of Portugal.
• Social Democratic Party, a political party of Romania.
• Socialist Destourian Party, the old name (to 1988) of the ruling party in Tunisia, currently called Constitutional Democratic Rally.

The Social Democratic Party (Portuguese: Partido Social Democrata, pron. ... The Social Democratic Party of Romania (in Romanian, Partidul Social Democrat, PSD) is a major political party of Romania. ... The Constitutional Democratic Rally (French: Rassemblement Constitutionel Démocratique) is the ruling party in Tunisia. ...

Sciences

• Particle size distribution, in many branches of science and technology.
• Phase sensitive detector, in electronics.
• Position sensitive device or position sensitive detector, a device that measures the one or two-dimensional position of a lightspot.
• Positive-semidefiniteness as it relates to matrices.
• Postsynaptic density, a specialization of the cytoskeleton at the synaptic junction.
• Post Source Decay, a technique used in MALDI mass spectrometry.
• Power spectral density is the power of a signal per some unit of measurement such as temporal or spatial frequency used in signal analysis.
• Prevention of significant deterioration, an American environmental program created under the Clean Air Act designed to maintain existing air quality in areas already meeting EPA National Ambient Air Quality Standards.

The particle size distribution[1] (PSD) of a powder or granular material is a list of values or a mathematical function that defines the relative amounts of particles present, sorted according to size. ... A lock-in amplifier (also known as a phase sensitive detector) is a type of amplifier that can extract a signal with a known carrier wave from a noisy environment. ... A Position Sensitive Device and/or Position Sensitive Detector (PSD) is an optical position sensor (OPS), that can measure a position of a light spot in one or two-dimensions on a sensor surface. ... A Position Sensitive Device and/or Position Sensitive Detector (PSD) is an optical position sensor (OPS), that can measure a position of a light spot in one or two-dimensions on a sensor surface. ... In linear algebra, a positive-definite matrix is a Hermitian matrix which in many ways is analogous to a positive real number. ... In mathematics, a matrix (plural matrices) is a rectangular table of elements (or entries), which may be numbers or, more generally, any abstract quantities that can be added and multiplied. ... The postsynaptic density (PSD) is a cytoskeletal specialization at neuronal synapses that was originally identified as an electron-dense region at the membrane of a postsynaptic neuron, as viewed by electron microscopy. ... The eukaryotic cytoskeleton. ... Illustration of the major elements in a prototypical synapse. ... Matrix-Assisted Laser Desorption/Ionization (MALDI) is a soft ionization technique used in mass spectrometry, allowing, among others, to ionize biomolecules (biopolymers like proteins, peptides and sugarchains) which tend to be more fragile and quickly lose structure when ionized by more conventional ionization methods. ... Mass spectrometry (also known as mass spectroscopy (deprecated)[1] or informally, mass-spec and MS) is an analytical technique used to measure the mass-to-charge ratio of ions. ... In physics, the spectral density, or more correctly the power spectral density (PSD) of a given bandwidth of electromagnetic radiation is the total power in this bandwidth divided by the specified bandwidth. ...

Computers

• .psd, the default file extension of the proprietary file format of Adobe System's Photoshop program.
• A portable or personal storage device, small hard drives designed to copy digital photographs from your camera.
• Programmable system device, an integrated circuit manufactured by ST Microelectronics and including Flash-ROM, RAM, and logic functions on a single chip.
• A Program Structure Diagram, also known as a Nassi-Shneiderman diagram.
• Power Supply Disturbance, a fault model for embedded systems and SoCs
• position sensing detecter

“Photoshop” redirects here. ... Portable storage devices (PSDs) are small hard drives designed to copy digital photographs from your camera. ... Typical hard drives of the mid-1990s. ... A Programmable system device (PSD) is a type of integrated circuit manufactured by STMicroelectronics. ... A Nassi-Shneiderman diagram is a graphical design representation for structured programming. ... What is an Embedded System? Electronic devices that incorporate a computer(usually a microprocessor) within their implementation. ... Look up SOC in Wiktionary, the free dictionary. ...

Medicine

• Post-traumatic stress disorder, though "PTSD" is more common.

Post-traumatic stress disorder (PTSD) is a term for certain severe psychological consequences of exposure to, or confrontation with, stressful events that the person experiences as highly traumatic. ...

Business

• Product Support & Development,
• Product Support Department

Others

• Pro Sports Daily, a popular sports website.
• Program Service Data, also known as Program Associated Data, usually data sent along with an HD radio program.
• Personal Security Detail, the name given to a group of private security contractors tasked with protecting a client.
• Platform screen doors, platform-edge doors used on railway platforms.
• Punch Sport Drink, a drink served to Midshipmen at the United States Naval Academy
• Pennsylvania Sumerian Dictionary, University of Pennsylvania's project to create an online dictionary of the first language.
• Psychiatric service dog, a specific type of assistance dog that helps people with psychiatric disabilities.
• Power Split Device, part of the Hybrid Synergy Drive on a Toyota Prius.
• Ford Power Stroke engine, the Ford turbo diesel engine available in the F250 / F350 line as well as other trucks.
• Philippine School Doha, one of the Philippine Schools in Doha.

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