Search results for "Induction"
showing 10 items of 769 documents
Positive mood induction procedures for virtual environments designed for elderly people
2012
Positive emotions have a significant influence on mental and physical health. Their role in the elderly’s wellbeing has been established in numerous studies. It is therefore worthwhile to explore ways in which elderly people can increase the number of positive experiences in their daily lives. This paper describes two Virtual Environments (VEs) that were used as mood induction procedures (MIPs) for this population. In addition, the VEs’ efficacy at increasing joy and relaxation in elderly users is analyzed. The VEs contain exercises for generating positive-autobiographic memories, mindfulness and slow breathing rhythms. The total sample comprised 18 participants over 55 years old who used t…
Adolescents’ musical relaxation: understanding related affective processing
2017
Music listening promotes adolescents’ well-being and relaxation in daily life. Relaxation is linked to affective self-regulation, but little is known about the specific affective processes of musical relaxation. The current study aimed to elaborate the affective dimension of adolescents’ musical relaxation, through detailed exploration of the related affect regulation goals, strategies, and induction mechanisms. A qualitative study with 55 adolescents (42 girls, 13 boys), aged 15, was conducted. Participants listened to self-selected relaxation music for 20 min, once in a laboratory and once at home, and provided written descriptions of their experience. A total of 110 episode descriptions …
Explaining the enjoyment of negative emotions evoked by the arts : the need to consider empathy and other underlying mechanisms of emotion induction
2017
Any model aiming to explain the enjoyment of negative emotions in the context of the arts should consider how works of art are able to induce emotional responses in the first place. For instance, research on empathy and the arts suggests that the psychological processes that mediate the enjoyment of sadness and horror may be fundamentally different. peerReviewed
Concentrations of ovarian proteohormones as biological markers for the outcome of assisted reproductive technology
2002
Objective: To assess whether the ovarian proteohormones inhibin A and B, pro-alpha-C and activin A could act as direct biological markers of a poorer or better response to ovulation induction or clinical conception through assisted reproductive technology (ART). Methods: Seventy-seven women who underwent ART were included in the study and were divided into two groups: (i) 46 women with sonographically documented follicular maturation; and (ii) 36 women who demonstrated inadequate follicle development. Blood samples were analyzed for inhibin A, inhibin B, pro-alpha-C, activin A and estradiol (E2) at day 3 of stimulation with recombinant follicle-stimulating hormone (rFSH) after pituitary dow…
Sleep Induction by Intranasal Application of Melatonin
1981
The sleep inducing potency of melatonin was tested in a double-blind study against placebo. The application form was a nasal spray with a 0.85% solution of melatonin in ethanol. 70% of the subjects fell asleep after treatment with the hormone.
Coupled Electric and Hydraulic Control of a PRS Turbine in a Real Transport Water Network
2019
Although many devices have recently been proposed for pressure regulation and energy harvesting in water distribution and transport networks, very few applications are still documented in the scientific literature. A new in-line Banki turbine with positive outflow pressure and a mobile regulating flap, named Power Recovery System (PRS), was installed and tested in a real water transport network for the regulation of pressure and flow rate. The PRS turbine was directly connected to a 55 kW asynchronous generator with variable rotational velocity, and coupled to an inverter. The start-up tests showed how automatic adjustment of the flap position and the runner velocity variation are able to c…
Optimization of Delayed-State Kalman-Filter-based Algorithm via Differential Evolution for Sensorless Control of Induction Motors
2010
This paper proposes the employment of the differential evolution (DE) to offline optimize the covariance matrices of a new reduced delayed-state Kalman-filter (DSKF)-based algorithm which estimates the stator-flux linkage components, in the stationary reference frame, to realize sensorless control of induction motors (IMs). The DSKF-based algorithm uses the derivatives of the stator-flux components as mathematical model and the stator-voltage equations as observation model so that only a vector of four variables has to be offline optimized. Numerical results, carried out using a low-speed training test, show that the proposed DE-based approach is very promising and clearly outperforms a cla…
Feedback Linearizing Control of Induction Motor Considering Magnetic Saturation Effects
2015
This paper presents an input-output feedback linearization (FL) control technique for rotating induction motors, which takes into consideration the magnetic saturation of the iron core. Starting from a new formulation of the dynamic model taking into consideration the magnetic saturation expressed in a space-state form in the rotor-flux-oriented reference frame, the corresponding FL technique has been developed. To this aim, a particular care has been given to the choice of nonlinear functions interpolating the magnetic parameters versus the rotor magnetizing current and the corresponding magnetic characteristic. The proposed FL technique has been tested experimentally on a suitably develop…
Insect oviposition induces volatile emission in herbaceous plants that attracts egg parasitoid
2003
SUMMARYThe egg parasitoid Trissolcus basalis (Wollaston) (Hymenoptera:Scelionidae) responded to synomones emitted by leguminous plants induced by feeding and oviposition activity of the bug Nezara viridula (L.)(Heteroptera: Pentatomidae). This was shown by laboratory bioassays using a Y-tube olfactometer. Broad bean leaves (Vicia faba L.) damaged by feeding activity of N. viridula and on which host egg mass had been laid produced synomones that attracted T. basalis. By contrast,undamaged leaves or feeding-damaged leaves without eggs did not attract wasp females. French bean plants (Phaseolus vulgaris L.) also emitted attractive synomones when they were damaged by host feeding and carrying e…
Pyriproxyfen, a juvenoid hormone analog, does not induce male production in parthenogenetic lineages of Eucypris virens (Crustacea: Ostracoda)
2007
Analogs of juvenoid hormones are increasingly recommended for controlling insect pests in agriculture. One of these analogs, pyriproxyfen, was found to be very potent in inducing male production in Daphnia under laboratory conditions, even after acute exposure. Other studies also demonstrated a major role of juvenoid hormones for the sex determination in arthropods that have sex chromosomes. We exposed parthenogenetic lineages of the freshwater ostracod Eucypris virens to a wide range of pyriproxyfen concentrations, and compared mortality and fecundity between treated and control animals. Animals exposed to the highest concentrations of pyriproxyfen (3-30 nM) experienced a higher mortality …