316 research outputs found
Senoi Dream Praxis
Anthropologists who work with the people Kilton Stewart called ‘senoi’ agree that his account of how those people talk about and use dreams is rather idealized. The inaccuracies seem to stem from unconscious but systematic methodological biases which Domhoff and I have discussed at length elsewhere (Ed. Note: See note at end of article). The following account of Senoi dream praxis draws on discussions I have had with other anthropologists, notably Geoffrey Benjamin of the University of Singapore and Clay Robarchek of the University of California. Senoi themselves, however, supplied most of the information, during conversations with me while I was Living with them in 1961—1963 and 1975. This article is therefore a critique neither of Stewart’s work nor of the therapy he pro-moted, merely a presentation of dream theory in Malaya
Development of a radiation hard version of the Analog Pipeline Chip APC128
The Analog Pipeline Chip (APC) is a low noise, low power readout chip for
silicon micro strip detectors with 128 channels containing an analog pipeline
of 32 buffers depth. The chip has been designed for operation at HERA with a
power dissipation of 300-400 muW per channel and has been used also in several
other particle physics experiments. In this paper we describe the development
of a radiation hard version of this chip that will be used in the H1 vertex
detector for operation at the luminosity upgraded HERA machine. A 128 channel
prototyping chip with several amplifier variations has been designed in the
radiation hard DMILL technology and measured. The results of various parameter
variations are presented in this paper. Based on this, the design choice for
the final production version of the APC128-DMILL has been made.Comment: 10 pages, 10 figure
Amplitude to phase conversion of InGaAs pin photo-diodes for femtosecond lasers microwave signal generation
When a photo-diode is illuminated by a pulse train from a femtosecond laser,
it generates microwaves components at the harmonics of the repetition rate
within its bandwidth. The phase of these components (relative to the optical
pulse train) is known to be dependent on the optical energy per pulse. We
present an experimental study of this dependence in InGaAs pin photo-diodes
illuminated with ultra-short pulses generated by an Erbium-doped fiber based
femtosecond laser. The energy to phase dependence is measured over a large
range of impinging pulse energies near and above saturation for two typical
detectors, commonly used in optical frequency metrology with femtosecond laser
based optical frequency combs. When scanning the optical pulse energy, the
coefficient which relates phase variations to energy variations is found to
alternate between positive and negative values, with many (for high harmonics
of the repetition rate) vanishing points. By operating the system near one of
these vanishing points, the typical amplitude noise level of commercial-core
fiber-based femtosecond lasers is sufficiently low to generate state-of-the-art
ultra-low phase noise microwave signals, virtually immune to amplitude to phase
conversion related noise.Comment: 7 pages, 6 figures, submitted to Applied Physics
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