We describe a highly sensitive new type of calorimeter based on the deflection of a ‘‘bimetallic’’ micromechanical sensor as a function of temperature. The temperature changes can be due to ambient changes, giving a temperature sensor or, more importantly, due to the heat absorbed by a coating on the sensor, giving a heat sensor. As an example we show the results of using the sensor as a photothermal spectrometer. The small dimensions and low thermal mass of the sensor make it highly sensitive and we demonstrate a sensitivity of roughly 100 pW. By applying a simple model of the system the ultimate sensitivity is expected to be of the order of 10 pW. The thermal response time of the cantilever can also be determined, giving an estimate of the minimum detectable energy of the sensor. This we find to be 150 fJ and again from our model, expect a minimum value of the order of 20 fJ.

Recordings of force developed simultaneously by four rowers in a good club-standard eight over a 20-min training run were analysed in terms of mean and variability. The average force-time profiles showed small but distinctive differences between rowers that were maintained as force declined through the run. The variability was examined further in terms of time-series of features extracted from single force-time profiles, including the peak force, duration and interstroke interval. There were consistent positive correlations between rowers in interstroke intervals even after removal of low-periodicity components (trends) in the time-series.

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Coordinare-free representations of the Riemann and Einstein tensors are obtained, and approximate diffeomorphism invariance is shown to exist for near-Rat simplicial geometries with sufficiently fat triangulations. Then, by finding the analogues of the contracted Bianchi identities for these near-Rat geometries, interdependence of the Regge equations is shown, and the relation to the coordinate degrees of freedom of the continuum is discussed.