Developmental Systems Theory (DST) is an interdisciplinary framework that seeks to understand the complexities of development—particularly in biological and psychological contexts—by emphasizing the dynamic interactions between genetics, environment, and individual behavior over time. It stands in contrast to traditional genetic or environmental determinism by viewing development as a product of a continuous interplay among various factors.

Diecast Collector is often referred to as a magazine, publication, or community that focuses on diecast model cars and collectibles. It typically features articles, reviews, news, and information about various diecast models produced by different manufacturers. The content may include profiles of popular diecast brands, insights into collecting, tips for maintaining and displaying collections, and interviews with collectors or industry experts.

A diffeomorphism is a concept from differential geometry and is used to describe a certain type of relationship between smooth manifolds. More formally, a diffeomorphism is a bijective (one-to-one and onto) function between two smooth manifolds that is smooth (infinitely differentiable) and whose inverse is also smooth.

A differential analyzer is an early type of analog computer designed to solve differential equations. It uses mechanical, electrical, or hydraulic systems to simulate the behavior of dynamic systems that can be described by differential equations. The primary purpose of a differential analyzer is to perform integration; this is because many physical processes can be described as a series of integrals or differential equations.

Diffusion current refers to the flow of charge carriers (such as electrons or holes in a semiconductor) due to a concentration gradient. In a material, charge carriers tend to move from regions of high concentration to regions of low concentration, similar to how substances diffuse from areas of higher concentration to areas of lower concentration in a fluid.

Dinicu Golescu (1810–1874) was a notable Romanian politician, writer, and advocate for social and political reform in the 19th century. He is particularly known for his contributions to Romanian literature and his role in the country's cultural and political movements during a time of significant upheaval and change. He was a member of the Golescu family, a prominent noble family that had a significant influence in Romania.

"Dioptrique" typically refers to a concept in optics related to the measurement of the refractive power of lenses and optical instruments. The term is derived from "diopter," a unit of measurement used to express the optical power of a lens. One diopter is the reciprocal of the focal length in meters. In a broader context, "dioptrique" can be associated with the study of refraction and the behavior of light as it passes through various media.

Dirk Coster was a Dutch physicist known for his contributions to the field of physics, particularly in relation to the discovery of elements and the development of periodic table concepts. Alongside his work, Coster is often recognized for the Coster-Kronig transition, which describes a particular process in atomic physics related to electron transitions and energy levels.