A simple linear electromechanical model for an electrostatically driven resonating cantilever is derived. The model has been developed in order to determine dynamic quantities such as the capacitive current flowing through the cantilever-driver system at the resonance frequency, and it allows us to calculate static magnitudes such as position and voltage of collapse or the voltage versus deflection characteristic. The model is used to demonstrate the theoretical sensitivity on the attogram scale of a mass sensor based on a nanometre-scale cantilever, and to analyse the effect of an extra feedback loop in the control circuit to increase the Q factor.

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IntroductionResearch, diagnosis and treatment of psychotic spectrum disorders have been traditionally dominated by an objectivist approach to their understanding, being primarily focused on positive and negative symptoms. The value of this approach goes without question, but it also involves considerable and widely known limitations. From a complementary perspective, there is a longstanding and promising phenomenological tradition in which the subjective experience of the patient's symptom becomes crucial. The focus on the anomalies of subjective experience, or the Basic Symptom concept specifically, has gained much momentum in the context of early detection of psychosis and schizophrenia.

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