Activity Sensors for Use in Psychiatric Evaluation

The need for objective methods of patient evaluation has long been recognized in clinical psychiatry. While the relationship between mood states and motor activity has been observed for many years, this relationship was never accurately defined due to the imprecise nature of the available observational techniques. This report describes two activity sensors and their related systems which objectively measure motor activity levels and patterns without affecting the patient's movements.     

``Cell Shocks'? Not Necessary in Chlorine Cell Rooms

Electrical safety hazards in chlorine electrolytic cell rooms have been thoroughly discussed in previous papers. However, no attempt has ever been made to show the importance of maintaining maximum leakage resistance from the electrolytic cell line to ground. The majority of electrical shocks received by electrolytic cell room personnel are from the energized bus or chlorine cells to ground. As electrolytic cell lines are normally not grounded, the leakage resistance to ground has a definite effect on the severity of the majority of electrical shocks received by personnel. The leakage resistance problem is explained with the use of simple circuit diagrams, and solutions are suggested to eliminate electrical shocks to cell room personnel.     

Quantitative evaluation of autoradiographs by X-ray spectroscopy.

Measurements of mass of developed silver in autoradiograms have been made using X-ray microanalysis. This procedure has been applied to a scanning electron microscopic study of protease-induced cell stimulation in 3H-thymidine-labelled bladder tissues in vitro. Differences in silver concentrations over individual nuclei were demonstrated by X-ray analysis and quantitative data was obtained showing an increased rate of 3H-thymidine incorporation in protease-treated cultures. The initial evidence indicates that X-ray microanalysis could provide a potentially useful quantitative procedure for autoradiography.     

Chemical changes in asbestos-based friction materials during performance — a review

The importance of chemical changes to the performance of asbestos based friction materials is discussed. The available information is reviewed in three sections: Composite Materials, Polymers, and Inorganic Materials. The relevance of the information is discussed and conclusions drawn regarding the scope for research into this area.     

Abrasion and corrosion resistant cobalt base alloys for hardfacing

Previous investigations carried out at CRM have shown that adding Mo, singly or in combination with Ni and/or Cu, enhances greatly the corrosion and abrasion resistance of high-carbon Co-Cr-W-C cast alloys.On account of these improvements, coatings of several Mo-, Ni- and/or Cu-modified grades of a Co-2.2% C-13% W-32% Cr alloy were prepared either by oxyacetylene welding with cast electrodes or by plasma spraying with prealloyed powders. The abrasion/corrosion behavior of the experimental deposits was compared with that of commercial alloys. The test data reported in this paper reveal the particularly good behaviour of the 18.2% Ni-4% Cu-8.7% Mo modified grade.     

Surface roughness changes during rolling

The changes in surface topography of a rolled strip have been examined after sequential passes giving various total reductions of cross-sectional area. A relocation technique has been used to reveal details of individual surface hills and valleys, and the data have been digitised for computation of selected surface parameters.It is found that the hills are very easily flattened, but that the valleys persist much longer, even after 40% reduction when a grease lubricant is used. A thin layer of MoS₂ provides lubrication but allows a smooth shiny surface to be produced by rolling.     

Demonstration of cytoplasmic actomyosin fibrils by the freeze-etching technique.

Cytoplasmic actomyosin fibrils of Physarum polycephalum were demonstrated by the freeze-etching technique. Within the fibrils the electron micrographs reveal 40-80 A thick filaments presumably representing F-actin. Thicker filaments (myosin) could not be detected. To avoid freezing artefacts, a pretreatment of the living material with 50% sucrose was necessary. The influence of freeze-protecting agents upon the fine structure of cytoplasmic actomyosins and the resulting difficulties in the investigation of constituents of the groundplasm with the freeze-etching technique are discussed.