Limiting conditional distributions for birth-death processes

In a recent paper one of us identified all of the quasi-stationary distributions for a non-explosive, evanescent birth-death process for which absorption is certain, and established conditions for the existence of the corresponding limiting conditional distributions. Our purpose is to extend these results in a number of directions. We shall consider separately two cases depending on whether or not the process is evanescent. In the former case we shall relax the condition that absorption is certain. Furthermore, we shall allow for the possibility that the minimal process might be explosive, so that the transition rates alone will not necessarily determine the birth-death process uniquely. Although we shall be concerned mainly with the minimal process, our most general results hold for any birth-death process whose transition probabilities satisfy both the backward and the forward Kolmogorov differential equations

An audio FIR-DAC in a BCD process for high power Class-D amplifiers

A 322 coefficient semi-digital FIR-DAC using a 1-bit PWM input signal was designed and implemented in a high voltage, audio power bipolar CMOS DMOS (BCD) process. This facilitates digital input signals for an analog class-D amplifier in BCD. The FIR-DAC performance depends on the ISI-resistant nature of this PWM-signal. An impulse response with only positive coefficients was chosen, because of its resistance to deadzone and mismatch. With a DAC current of 0.5 mA, the dynamic range is 111 dB (A-weighted), with SINAD = 103 dB (A-weighted). The current consumption is 1mA for the analog part and 4.8 mA for the digital part. The power consumption is 29 mW at V/sub dd/ = 5 V and the chip area is 2 mm/sup 2/ including the reference diode that can be shared by more channels

On the speed of convergence to stationarity of the Erlang loss system

We consider the Erlang loss system, characterized by $N$ servers, Poisson arrivals and exponential service times, and allow the arrival rate to be a function of $N.$ We discuss representations and bounds for the rate of convergence to stationarity of the number of customers in the system, and display some bounds for the total variation distance between the time-dependent and stationary distributions. We also pay attention to time-dependent rates

Detach Yourself:The Positive Effect of Psychological Detachment on Patient Safety in Long-Term Care

OBJECTIVES: Delivering health care is emotionally demanding. Emotional competencies that enable caregivers to identify and handle emotions may be important to deliver safe care, as it improves resilience and enables caregivers to make better decisions. A relevant emotional competence could be psychological detachment, which refers to the ability to psychologically detach from work and patients in off-duty hours. The objective of this study was to examine the relationship between psychological detachment and patient safety. In addition, the ability of teams to create a safe environment to discuss errors and take personal risks, i.e., psychological safety, was explored as an underlying condition for psychological detachment. METHODS: A total of 1219 caregivers (response rate = 44%) from 229 teams in two long-term care organizations completed a survey on psychological safety and psychological detachment at T0. Team managers rated patient safety of those teams at two points in time (T0 and T1). RESULTS: Two-level regression analysis showed that both psychological safety (β = 0.72, P < 0.01) and psychological detachment (β = 0.54, P < 0.05) relate directly to patient safety. Psychological safety relates positively to psychological detachment (β = 0.48, P < 0.01) but was, however, not an underlying condition. CONCLUSIONS: Perceived patient safety is enhanced by emotional competencies, at individual level by psychological detachment and at team level by psychological safety. Caregivers should be aware of the important influence emotional competencies have on patient safety and be trained to develop these competencies. Future research should focus on exploring underlying conditions for emotional competencies

Tolerance

Tolerance entails acceptance of the very things one disagrees with, disapproves of or dislikes. Tolerance can be seen as ‘a flawed virtue’ (Schuyt, 2001), because it concerns acceptance of the differences between others and ourselves we would rather fight, ignore or overcome. Although tolerance carries with it this negative connotation of conditionality, as imperfect as it may be it does provide a ‘recipe’ for dealing with sometimes irreconcilable differences between (groups of) people in society. In this paper an examination of the paradoxical nature of tolerance (part I), is followed by a review of academic literature and empirical findings on tolerance, its determinants and consequences (part II). To conclude, future challenges for tolerance research are outlined (part III)

Presence and species identity of rumen flukes in cattle and sheep in the Netherlands

The purpose of the study was to gain knowledge about the prevalence and identity of rumen flukes (RF) in cattle and sheep in the Netherlands. Routine faecal examinations of diagnostic submissions between May 2009 and September 2014 showed a mean annual herd or flock RF prevalence of 15.8% for cattle and 8.0% for sheep. Prevalence in cattle was higher after 2012 than before, which may reflect a change in detection method as well as an increase in true prevalence. During November and December 2014, an abattoir survey was conducted to allow for scoring of rumen fluke burden and to obtain specimens for molecular species characterization. Over 8 visits to 5 abattoirs in areas deemed to pose a high risk for trematode infection, 116 cows and 41 sheep from 27 herds and 10 flocks were examined. Prevalence of RF was higher in beef cattle than in dairy cattle and higher in cattle than in sheep. Median fluke burden was &gt;100 specimens per animal for most positive animals. Using a semi-quantitative RF density score as a gold standard, sensitivity and specificity of a modified quantitative Dorsman egg counting method were estimated at 82.6% and 83.3%, respectively. Of 14 collected adult rumen flukes, twelve (8 bovine and 4 ovine specimens) were identified as Calicophoron daubneyi. The other two, of bovine origin, were identified as Paramphistomum leydeni, which was unexpected as in other European countries all recently collected rumen flukes in both cattle and sheep were identified as C. daubneyi. The findings implicate that multiple rumen fluke species, intermediate host species and transmission cycles may play a role in rumen fluke infections in the Netherlands