positive wave
51sine wave — the waveform of an alternating current characterized by a rise from zero to maximum positive potential, descending back through zero to its maximum negative value, and then rising back to zero. Called also sinusoidal w. and sinusoidal waveform …
52v wave — in a tracing of the venous pulse, a positive deflection representing the filling of the right atrium against the closed tricuspid valve during ventricular contraction. See also illustration at pulse …
53Cylinder head porting — refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve the quality and quantity of the air flow. Cylinder heads, as manufactured, are usually suboptimal due to design and manufacturing… …
542004 Indian Ocean earthquake and tsunami — 2004 Indian Ocean earthquake Tsunami strikes Ao Nang, Thailand. Date 00:58:53, December 26 …
55Auditory brainstem response — The auditory brainstem response (ABR) is an auditory evoked potential extracted from ongoing electrical activity in the brain and recorded via electrodes placed on the scalp. The resulting recording is a series of vertex positive waves of which I …
56Bomb — A bomb is any of a range of devices that typically rely on the exothermic chemical reaction of an explosive material to produce an extremely sudden and violent release of energy. (A nuclear weapon employs chemical based explosives to initiate a… …
57Blast injury — Infobox Disease Name = Blast injury Caption = DiseasesDB = ICD10 = ICD9 = ICDO = OMIM = MedlinePlus = eMedicineSubj = emerg eMedicineTopic = 63 MeshID = A blast injury is the result of physical trauma sustained in an explosion. Blast injuries are …
58Electrophysiology — (from Greek gr. ἥλεκτρον, ēlektron , amber [see the etymology of electron ] ; gr. φύσις, physis , nature, origin ; and gr. λογία, logia ) is the study of the electrical properties of biological cells and tissues. It involves measurements of… …
59venous pulse — the pulsation that occurs in a vein, usually observed at the right jugular vein just above the sternoclavicular junction. Normal jugular venous pulse: A, a positive wave due to contraction of the right atrium; C, a positive deflection due to… …
60Electrocardiogram — An electrocardiogram (ECG or EKG, abbreviated from the German Elektrokardiogramm ) is a noninvasive transthoracic graphic produced by an electrocardiograph, which records the electrical activity of the heart over time. Its name is made of… …
