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Two experiments asked whether resistance to change depended on variable-ratio as opposed to variable-interval contingencies of reinforcement and the different response rates they establish. In Experiment 1, pigeons were trained on multiple random-ratio random-interval schedules with equated reinforcer rates. Baseline response rates were disrupted by(More)
" Machines alone do not give us mass production. Mass production is achieved by both machines and men. " – Henry Ford II Abstract — Intelligent assist devices (IADs) are a new class of hybrid 1 devices for direct, physical, interaction with a human operator in shared workspaces. These devices – designed for the assembly line worker – can reduce ergonomics(More)
PurposeTo define optical coherence tomography (OCT) characteristics of type-1, type-2, and mixed big bubbles (BB) seen in deep anterior lamellar keratoplasty.MethodsHuman sclero-corneal discs were obtained from UK (30) and Canada (16) eye banks. Air was injected into corneal stroma until a BB formed. UK samples were fixed in formalin before scanning with(More)
This paper presents the design, fabrication, operating characteristics and applications of a wideband, high-frequency, line-focus beam transducer we constructed using a 9 microm thick piezoelectric polyvinylidene fluoride (PVDF) film. This transducer possesses a focal length of 2.38 mm and an aperture angle of 84 degrees. The frequency spectrum of the(More)
— Thick, fully depleted p-channel charge-coupled devices (CCDs) have been developed at the Lawrence Berkeley National Laboratory (LBNL). These CCDs have several advantages over conventional thin, n-channel CCDs, including enhanced quantum efficiency and reduced fringing at near-infrared wavelengths and improved radiation tolerance. Here we report results(More)
The antigenicity and composition of chromatins differ markedly in chromatin preparations obtained by different procedures. Rat Novikoff hepatoma chromatin (NC) obtained by the "salt precip itation" and the micrococcal nuclease digestion procedures using significant levels of EDTA and NaCI each shows a common complement fixation (CF) capacity, exceeding(More)
Intelligent assist devices (IADs) are a new class of hybrid' devices for direct, physical, interaction with a human operator in shared workspaces. These devices-designed for the assembly line worker-can reduce ergonomics concerns that arise due to on-the-job physical and cognitive loading, while improving safety, quality and productivity. Cobots, a subset(More)
The antigenicity and composition of chromatins differ markedly in chromatin preparations obtained by different procedures. Rat Novikoff hepatoma chromatin (NC) obtained by the "salt precip itation" and the micrococcal nuclease digestion procedures using significant levels of EDTA and NaCI each shows a common complement fixation (CF) capacity, exceeding(More)