An assessment of the effects of microstructure on room temperature fatigue threshold and crack propagation behaviour has been carried out on microstructural variants of U720Li, i.e. as-received U720Li, U720Li-LG (large grain variant) and U720Li-LP (large intragranular coherent γ′ variant). Fatigue tests were carried out at room temperature using a 20Hz sinusoidal cycling waveform at an Rratio=0...

This study was conducted to determine whether or not hypothermia changes ventricular defibrillation threshold. Ventricular fibrillation was induced by electrical stimulation of the endocardium in pentobarbital anesthetized dogs, both during normothermia and hypothermia produced by circulating 8 °C water through a rubber bladder implanted in the peritoneal cavity. Defibrillation threshold was de...

Yellow-bellied marmots, Marmota flaviventris, prepared with U-shaped thermodes in the epidural space of the thoracic vertebral canal, a thermode in the preoptic hypothalamus, and cortical surface and hippocampal electrodes, were used to investigate the interaction of arousal states with temperature regulation. It was found that arousal state of the animal influences the thermoregulatory respons...

A resistorless CMOS nonbandgap voltage reference, which is compatible with 180nm CMOS Technology is presented in this paper. In order to reduce the temperature nonlinearity in proposed voltage reference, threshold voltage and a proportional to absolutely temperature (PTAT) voltage form the basic linear temperature components, which are achieved by resistorless threshold voltage extractor and di...

We study the threshold voltage (Vth) instability of commercially available silicon carbide (SiC) power MOSFETs or prototypes from four different manufacturers under positive bias temperature stress (PBTS). A positive bias near Vth causes a threshold voltage shift of 0.7 mV per decade in time per nanometer oxide thickness in the temperature range between -50°C and 150°C. Recovery at +5 V after a...

Sex in many organisms is a dichotomous phenotype--individuals are either male or female. The molecular pathways underlying sex determination are governed by the genetic contribution of parents to the zygote, the environment in which the zygote develops or interaction of the two, depending on the species. Systems in which multiple interacting influences or a continuously varying influence (such ...

Photodetachment spectroscopy of OH(-) and H(3)O(2)(-) anions has been performed in a cryogenic 22-pole radiofrequency multipole trap. Measurements of the detachment cross section as a function of laser frequency near threshold have been analysed. Using this bound-free spectroscopy approach we could demonstrate rotational and vibrational cooling of the trapped anions by the buffer gas in the mul...

OBJECTIVES The purpose of the study was to determine the influence of finger skin temperature on the vibrotactile perception threshold at fingertips, determined according to the method described in ISO 13091-1 standard. MATERIALS AND METHODS The effect of the cooling and warming of hands on vibration perception was investigated in 21 healthy women. Vibration perception measurements were condu...

OBJECTIVE To quantify the lagged effects of mean temperature on deaths from cardiovascular diseases in Brisbane, Australia. DESIGN Polynomial distributed lag models were used to assess the percentage increase in mortality up to 30 days associated with an increase (or decrease) of 1°C above (or below) the threshold temperature. SETTING Brisbane, Australia. PATIENTS 22 805 cardiovascular de...

Temperature dependent propagation delay characteristics of CMOS circuits will experience a complete reversal in the near future. Contrary to the older technology generations, the speed of circuits in a 32 nm CMOS technology is enhanced when the temperature is increased at the nominal supply and threshold voltages. The enhancement of circuit speed provides new opportunities to lower the energy c...