Crest voltmeters

Galvanometers, Electromechanical Voltmeters, and Ammeters

Measurement of Ac Voltages with Digital Voltmeters

A principle of using high-resolution digital voltmeters (DVs) HewlettPackard 3458A for the measurement of AC voltages in DCV range is described. The method of approximate synchronous sampling is used, having only one sample per cycle of a working frequency close to 16 Hz, when the mean value of one-third cycle is measured. The beginning of integration is shifted for the same interval for every ...

Neural Crest

Early in the process of development, vertebrate embryos develop a fold on the neural plate [6] where the neural and epidermal ectoderms meet, called the neural crest [7]. The neural crest [7] produces neural crest cells [8] (NCCs), which become multiple different cell types and contribute to tissues and organs as an embryo develops. A few of the organs and tissues include peripheral and enteric...

Effect of Crest Roughness on Flow Characteristics over Circular Weirs

Different construction materials with different roughness used to make circular weirs highly affect surface roughness and, in turn, flow hydraulics passing over these structures.  In the present research, numerous experiments under different hydraulic conditions were performed on a physical model to study the effects of roughness on flow hydraulics over a circular weir. The flow hydraulics incl...

The neural crest

The neural crest is a transient and discrete embryonic cell population of profound importance to the development and the evolution of the vertebrates. This cell type emerges from the dorsal neural tube during early development. Subsequently, the cells migrate into the periphery along stereotypical paths to a number of sites at which these cells stop and differentiate into a wide variety of deri...