Contents Introduction Personnel 1 2 Publications and Reports 4 Research Projects I Microwave and Physical Electronics A High-Power Magnetron Research B Cathode Research 1 Cathode Interface Studies 2 The Interface as a Blocking Layer 3 Work Functions and Conductivity of Oxide Cathodes 4 Spectral Emissivity of Tungsten 5 Electron Emission in Accelerating and Retarding Fields C Ionization Gauge Research D Properties of Cathode-Ray Tube Screens E Determination of Emission Properties of Single Crystals F Construction of 5-'1M Oxford Type Tube G Travelling-Wave Amplifier Tubes 1 Theoretical Considerations 2 Experimental Studies II III Microwave Physics A Microwave Spectroscopy 1. Microwave-Frequency Bridge (5 mm) 2 Sweep Spectroscope 3 Audio-Frequency Bridge 4 Nuclear Magnetic Moment of Hydrogen Caesium Hyperfine Structure 5 B Molecular Beam Research C Low Pressure Gas Discharges D Low Temperature Research 1 Helium Liquefiers 2 Studies on Liquid Helium 3 Studies on Beryllium 4 Superconductivity at 1 25 cm 5 Magnetic Nuclear Resonance Experiments 6 Adiabatic Demagnetization 7 Phase Transitions in the Hydrogen Halides E Ferromagnetism at Microwave Frequencies Modern Electronic Technicues Applied to Physics and Engineering A Design and Construction of a Microwave Accelerator B Ultrasonics Research Program 1 Scope and Purpose 2 Ultrasonics as a Tool 3 Pulse Technique 4 Absorption Mechanisms in Liquids 5 Measurement Projects in 15-Mc/sec Range 6 Extension of the Frequency Range C Development of Flash Tube D Cyclotron R-F Project E Three-Cm Sweep-Frequency Oscillator 5 7 7 11 14 14 14 14 14 14 15 16 16 17 18 18 18 18 19 19 20 20 22 22 22 23 24 31 31 73 34 37 37 37 38 40 42 49 53 53 54 IV Communications and Related Projects A Modulation Studies Spectrum Utilization B C D E V 55 Efficiency of Power Utilization, Signal-to-Noise Ratios 1 General Analysis of the Transmission of Information 2 Pulse Modulation Studies 3 Properties of Random Noise 4 The Action of Limiters and Discriminators in FM Receivers in the Presence of Noise Stabilized Oscillator Problems Multipath Transmission Wideband Amplifier Studies Response of Networks to Frequency Transients Miscellaneous Problems A Locking Phenomena in R-F Oscillators B Electronic Differential Analyzer 0 Electronic Potential Mapping D Transient Phenomena in Waveguides E Broadbanding of Arbitrary Impedances F Elementary Properties of the Partition Function in the Order-Disorder Problem G 55 55 56 62 64 68 73 76 77 81 81 84 84 88 88 Remarks on Approximation of a Specified Amplitude and Phase by a Linear Network 88