Transverse planeThe transverse plane (also known as the horizontal plane, axial plane and transaxial plane) is an anatomical plane that divides the body into superior and inferior sections. It is perpendicular to the coronal and sagittal planes. Transverse thoracic plane Xiphosternal plane (or xiphosternal junction) Transpyloric plane Subcostal plane Umbilical plane (or transumbilical plane) Supracristal plane Intertubercular plane (or transtubercular plane) Interspinous plane The transverse thoracic plane Plane through T4 & T5 vertebral junction and sternal angle of Louis.
Coronal planeThe coronal plane (also known as the frontal plane) is an anatomical plane that divides the body into dorsal and ventral sections. It is perpendicular to the sagittal and transverse planes. The coronal plane is an example of a longitudinal plane. For a human, the mid-coronal plane would transect a standing body into two halves (front and back, or anterior and posterior) in an imaginary line that cuts through both shoulders.
OscillationUne oscillation est un mouvement ou une fluctuation périodique autour d'une position d'équilibre stable. Les oscillations sont soit régulières (périodiques) soit décroissantes (amorties). Elles répondent aux mêmes équations quel que soit le domaine. Une oscillation est une "variation d'une grandeur mécanique, électrique, caractérisée par un changement périodique de sens". Le cycle d'une oscillation est le temps écoulé entre deux passages successifs par la position d'équilibre.
Anatomical planeAn anatomical plane is a hypothetical plane used to transect the body, in order to describe the location of structures or the direction of movements. In human and animal anatomy, three principal planes are used: The sagittal plane or lateral plane (longitudinal, anteroposterior) is a plane parallel to the sagittal suture. It divides the body into left and right. The coronal plane or frontal plane (vertical) divides the body into dorsal and ventral (back and front, or posterior and anterior) portions.
Coupe sagittaleThe sagittal plane (ˈsædʒɪtəl; also known as the longitudinal plane) is an anatomical plane that divides the body into right and left sections. It is perpendicular to the transverse and coronal planes. The plane may be in the center of the body and divide it into two equal parts (mid-sagittal), or away from the midline and divide it into unequal parts (para-sagittal). The term sagittal was coined by Gerard of Cremona. Examples of sagittal planes include: The terms median plane or mid-sagittal plane are sometimes used to describe the sagittal plane running through the midline.
Onde transversaleEn physique ondulatoire, une ou est une onde dont la perturbation du milieu se fait dans l'une des directions orthogonales à celle de sa propagation. Lorsque ces directions sont parallèles, l'onde est dite longitudinale. Les vagues à la surface de l'eau sont des ondes transversales. Une onde sur une corde est également transverse. Les ondes électromagnétiques sont des ondes transversales. thumb|305px|Propagation d'une perturbation des champ électrique E et champ magnétique B. Onde électromagnétique Les ond
Self-oscillationSelf-oscillation is the generation and maintenance of a periodic motion by a source of power that lacks any corresponding periodicity. The oscillator itself controls the phase with which the external power acts on it. Self-oscillators are therefore distinct from forced and parametric resonators, in which the power that sustains the motion must be modulated externally. In linear systems, self-oscillation appears as an instability associated with a negative damping term, which causes small perturbations to grow exponentially in amplitude.
QuasiperiodicityQuasiperiodicity is the property of a system that displays irregular periodicity. Periodic behavior is defined as recurring at regular intervals, such as "every 24 hours". Quasiperiodic behavior is a pattern of recurrence with a component of unpredictability that does not lend itself to precise measurement. It is different from the mathematical concept of an almost periodic function, which has increasing regularity over multiple periods. Climate oscillations that appear to follow a regular pattern but which do not have a fixed period are called quasiperiodic.
Phase-contrast imagingPhase-contrast imaging is a method of that has a range of different applications. It measures differences in the refractive index of different materials to differentiate between structures under analysis. In conventional light microscopy, phase contrast can be employed to distinguish between structures of similar transparency, and to examine crystals on the basis of their double refraction. This has uses in biological, medical and geological science.
Formule (mathématiques)En logique et en mathématiques, une formule est une suite finie d'objets, dotée de propriétés particulières qui rendent possible la syntaxe dans tous ces domaines. Étant donné un ensemble E et une fonction de poids p: E →N, une formule est un mot extrait de E obtenu par les deux règles de construction suivantes : un seul élément de E de poids 0 est une formule ; si t est un élément de poids n, pour toute suite de n formules F1, F2, ...., Fn, le mot concaténé tF1F2....Fn est une formule.
