A study of the relative rates of the alkyl hydrogen abstraction
from a series of meta and para substituted t-butylbenzenes by the
chlorine atom at 70°C has been carried out. Application of the
Hammett equation yielded a ρ value of -0.44 for the para compounds.
Possible explanations for the non-linearity...
This study was designed to learn the effect a specific herbicide practice on plant communities. Data were obtained from brushfields that had been aerially sprayed with 2,4-D (2,4 dichiorophenoxyacetic acid) and/or 2,4,5-T (2,4,5 trichlorophenoxyacetic acid). Qualitative data on species composition, cover percent, height, response to herbicide and site description were...
This dissertation describes a new radio-frequency power-amplifier circuit and mode of operation that exceeds the efficiency of the conventional class C amplifier in the low and medium h-f range. It will be found useful in applications where linearity between the input and output are not required, as in all applications...
The maximum principle developed by the Russian mathematician,
L.S. Pontryagin is considered to be one of the most significant
contributions to the recent advances in mathematical optimization
techniques.
Unfortunately, most of the published literature on the application
of the maximum principle is in the field of control system design,
and...
A waveform-preserving, variable time-delay system capable of
several milliseconds delay is described in this thesis. These considerably
long delays are achieved by judicious use of the relatively
low sonic velocity of gases. Initial system design criteria specified
a time delay of ten milliseconds and a signal bandwidth of 0-10 KC....
A sampling criterion which provides a numerical relationship
between sampling rate and worst-case peak error for linear interpolation
of sample points is presented. The criterion, based upon the
second derivative of a waveform, is derived, its properties are observed
for a sine wave, and its applicability to complex signals is...
It was observed that certain myoelectric surface
potentials are of a pulse nature. The pulses have nearly
the same exact waveshape, but are asynchronously
repetitive.
Physiological evidence indicated that myoelectric
pulses are concurrent with the activity of a small unit
of organized muscle fibres (motor unit). The electrical
activity of...