A continuous recorder of radio field intensities

Norton, KA; Reymer, S.E.

doi:10.6028/jres.011.027

BUR. STAN. J. RES.

1933

DOI: 10.6028/jres.011.027

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A continuous recorder of radio field intensities

KA Norton¹,

S.E. Reymer²

Abstract: A recorder of received radio field intensities is described which is used for making continuous records with no attention from operating personnel during periods of at least 24 hours. A bridge arrangement is described which makes feasible the

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Dynamics of Natural Rubber as a Function of Frequency, Temperature, and Pressure. A Dielectric Spectroscopy Investigation

et al. 2010

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Natural rubber (NR) isolated from Hevea Brasiliensis was investigated by differential scanning calorimetry, dielectric spectroscopy, and high-pressure dielectric spectroscopy. In the range of frequencies (5 × 10−2 to 3 × 106 Hz), temperatures (−120 to 120 °C), and pressures (0.1 to 240 MPa) studied, the dielectric spectra exhibit two overlapped α-processes but no subglass relaxations. Thermal measurements revealed the presence of some moisture in NR. To elucidate the influence of water, dielectric measurements were carried out in dry and wet NR samples. The origin of the two dielectrically active processes was discussed in terms of (i) the apparent activation volume, (ii) the pressure coefficient of the respective glass temperatures, and (iii) the values of the ratio of activation energies, at constant volume and pressure. The latter allowed extracting the relative contribution of thermal energy and volume for each dynamic process. On the basis of these results, the faster α-processes is assigned to the rigidified rubber backbone dynamics whereas the slower to fatty acids (such as stearic acid) that are linked to the rubber chain.

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Dynamics of Natural Rubber as a Function of Frequency, Temperature, and Pressure. A Dielectric Spectroscopy Investigation

et al. 2010

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Note on the Synchronization of Broadcast Stations WJZ and WBAL

Norton¹

1934

Proc. IRE

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Recent Research in Radio Communication

Hamburger

1935

Trans. Am. Inst. Electr. Eng.

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A continuous recorder of radio field intensities

Abstract: A recorder of received radio field intensities is described which is used for making continuous records with no attention from operating personnel during periods of at least 24 hours. A bridge arrangement is described which makes feasible the

Cited by 3 publications

References 0 publications

Dynamics of Natural Rubber as a Function of Frequency, Temperature, and Pressure. A Dielectric Spectroscopy Investigation

Dynamics of Natural Rubber as a Function of Frequency, Temperature, and Pressure. A Dielectric Spectroscopy Investigation

Note on the Synchronization of Broadcast Stations WJZ and WBAL

Recent Research in Radio Communication

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