Apparatus makes klystron operating frequency adjustable from remote point

Apparatus makes possible proper frequency adjustment in a receiver using a pump klystron for a traveling-wave master. It incorporates a tunable overcoupled cavity with irises of appropriate size to accomplish frequency spread over the desired range and to maintain the Q of the klystron circuit at the optimum value

Circulator having quarter wavelength resonant post and parametric amplifier circuits utilizing the same Patent

Development of electromagnetic wave transmission line circulator and application to parametric amplifier circuit

Thermal short improves sensitivity of cryogenically cooled maser

In-line, quarter-wave thermal short cools the center conductor of the signal-input coaxial transmission line to a cryogenically cooled traveling wave maser. It reduces both the thermal noise contribution of the coaxial line and the heat leak through the center conductor to the maser at 4.4 degrees K

A simple tester provides resonant frequency measurements of ferrite devices

Tester enables direct measurement of the resonant frequency of an yttrium iron garnet disk. The disk is tested while mounted on the isolator strip with less regard for dimensional flaws

Cryogenic waveguide window is sealed with plastic foam

Waveguide windows made with polystyrene preformed plastic and sealed with foamed-in-place plastic are useful in any microwave waveguide system using cryogenic cooling

Double-throw microwave device switches two lines quickly

By combining a single-throw microwave switch with a microwave circulator in a circuit, two input lines can be switched quickly. There is only a brief transition time when both /or neither/ of the two lines are connected to an output line

Distributional and behavioural effects of the German labour market reform

"We estimate the effects of the reform of German Unemployment Insurance that replaced the wage-related Unemployment Assistance with an income maintenance Programme and stronger means testing. We model the tax-benefit system and use the Socio-Economic Panel. We estimate a discrete labour supply model and simulate the behavioural and distributional effects using the pseudo distribution method. Poverty and inequality decline overall, since households with children and low incomes gain, while those who used to earn high wages and received high unemployment transfers lose most. The behavioural responses mitigate the redistributive impact of the reform." (Author's abstract, IAB-Doku) ((en)) Additional Information Kurzfassung (deutsch) Executive summary (English)Arbeitsmarktpolitik, Verteilungseffekte, Einkommensverteilung, soziales System, Einkommenseffekte, Sozialleistungen, Arbeitslosengeld II-Empfänger, Arbeitslosengeld II, Einkommenshöhe, Familieneinkommen, soziale Gerechtigkeit, Erwerbsbeteiligung, Beschäftigungseffekte, Umverteilung, Armutsbekämpfung, Arbeitslose, Arbeitsuchende, Arbeitsuche, Erwerbsverhalten

Oxidation of Columbium-Chromium Alloys at Elevated Temperatures

Screening studies of the oxidation characteristics of binary alloys of columbium (Ref. 1) showed that chromium was an additive element worthy of intensive study. The screening studies showed that chromium additions were especially helpful in decreasing the oxidation rate of columbium at 10000deg C and were somewhat less beneficial at 12000deg C. It is the purpose of this investigation to study the oxidation characteristics of binary columbium-chromium alloys in more detail

Vertical axis wind turbine drive train transient dynamics

Start up of a vertical axis wind turbine causes transient torque oscillations in the drive train with peak torques which may be over two and one half times the rated torque of the turbine. A computer code, based on a lumped parameter model of the drive train, was developed and tested for the low cost 17 meter turbine; the results show excellent agreement with field data. The code was used to predict the effect of a slip clutch on transient torque oscillations. It was demonstrated that a slip clutch located between the motor and brake can reduce peak torques by thirty eight percent