a thermo-hygrograph or hygrothermograph is a chart recorder that measures and records both temperature and humidity or dew point .similar devices that record only one parameter are a thermograph for temperature and hygrograph for humidity.. thermographs where the variations are recorded using photography were described by several scientists as early as 1845, including francis ronalds who was .
active vibration isolation systems contain, along with the spring, a feedback circuit which consists of a sensor for example a piezoelectric accelerometer or a geophone , a controller, and an actuator. the acceleration vibration signal is processed by a control circuit and amplifier.
a principal components analysis scatterplot of y-str haplotypes calculated from repeat-count values for 37 y-chromosomal str markers from 354 individuals. pca has successfully found linear combinations of the different markers, that separate out different clusters corresponding to different lines of individuals' y-chromosomal genetic descent.
the vibrating microtome is usually used for difficult biological samples. the cut thickness is usually around 30–500 μm for live tissue and 10–500 μm for fixed tissue. citation needed a variation on the vibrating microtome is the compresstome microtome,.
the efficiency of tumbler screening machine η can be express as: η = m p ÷m f, where m p is the mass of fine particles which pass through the screen surface during the operation of tumbler screening machine, and mf is the mass of fine particles which in the initial feed of material to the tumbler screening machine.
vibrating viscometers are the most widely used inline instrument to monitor the viscosity of the process fluid in tanks, and pipes. quartz viscometer. the quartz viscometer is a special type of vibrational viscometer. here, an oscillating quartz crystal is immersed into a fluid and the specific influence on the oscillating behavior defines the .
what that means is this: oxygen and nitrogen are the two most common substances in air. 'diffused' in this case means 'scattered'. light is a form of very rapid vibration, waves in other words; the wavelength of light is the distance it travels in a single vibration/wave. different wavelengths of light are seen as different colors. red is .
linear continuous-time circuit is perhaps the most common meaning for filter in the signal processing world, and simply 'filter' is often taken to be synonymous. these circuits are generally designed to remove certain frequencies and allow others to pass. circuits that perform this function are generally linear in their response, or at least .
shock describes matter subject to extreme rates of force with respect to time. shock is a vector that has units of an acceleration rate of change of velocity . the unit g or g represents multiples of the acceleration of gravity and is conventionally used. a shock pulse can be characterised by its peak acceleration, the duration, and the .
these work on a fundamentally different principle, whereby tiny piezoceramic elements, vibrating many thousands of times per second, cause linear or rotary motion. there are different mechanisms of operation; one type uses the vibration of the piezo elements to step the motor in a circle or a strht line.