3,261 research outputs found
Total control over ultracold interactions via electric and magnetic fields
The scattering length is commonly used to characterize the strength of
ultracold atomic interactions, since it is the leading parameter in the
low-energy expansion of the scattering phase shift. Its value can be modified
via a magnetic field, by using a Feshbach resonance. However, the effective
range term, which is the second parameter in the phase shift expansion,
determines the width of the resonance and gives rise to important properties of
ultracold gases. Independent control over this parameter is not possible by
using a magnetic field only. We demonstrate that a combination of magnetic and
electric fields can be used to get independent control over both parameters,
which leads to full control over elastic ultracold interactions.Comment: 4 pages, 3 figure
Affordances and limitations of algorithmic criticism
Humanities scholars currently have access to unprecedented quantities of machine-readable texts, and, at the same time, the tools and the methods with which we can analyse and visualise these texts are becoming more and more sophisticated. As has been shown in numerous studies, many of the new technical possibilities that emerge from fields such as text mining and natural language processing can have useful applications within literary research. Computational methods can help literary scholars to discover interesting trends and correlations within massive text collections, and they can enable a thoroughly systematic examination of the stylistic properties of literary works. While such computer-assisted forms of reading have proven invaluable for research in the field of literary history, relatively few studies have applied these technologies to expand or to transform the ways in which we can interpret literary texts. Based on a comparative analysis of digital scholarship and traditional scholarship, this thesis critically examines the possibilities and the limitations of a computer-based literary criticism. It argues that quantitative analyses of data about literary techniques can often reveal surprising qualities of works of literature, which can, in turn, lead to new interpretative readings
Heupfracturen zo snel mogelijk opereren
A recent retrospective study in the Netherlands found no significant association between delayed hip fracture surgery and the occurrence of complications. This argues against the use of the Dutch hospital quality indicator measuring the percentage of patients with hip fracture operated within 24 to 48 hours. However, much larger international prospective studies have shown that delaying surgery results in prolonged duration of pain and hospitalisation and increased rate of complications. There is no evidence that delaying surgery is beneficial for the patient. Therefore, the current Dutch hospital quality indicator for timely initiation of treatment for hip fractures should remain unchanged in the interest of this fragile patient group
Patient satisfaction after total knee replacement—still a challenge
During a validation process of the Swedish
Knee Arthroplasty Register (SKAR), living registered patients were sent a questionnaire to ask if they had been reoperated on. This gave an opportunity to pose a simple
four-point question with respect to patient satisfaction
which 95% of patients answered. We analyzed the answers of patients operated on between 1981 and 1995 and
found that only 8% of the patients were dissatisfied regarding their knee arthroplasty 2–17 years postoperatively. The satisfaction rate was constant, regardless of when
the operation had been performed during the 15-year period. The proportion of satisfied patients was affected by
the preoperative diagnosis, patients operated on for a
long-standing disease more often being satisfied than
those with a short disease-duration. There was no difference in proportions of satisfied patients, whether they had
primarily been operated on with a total knee arthroplasty
(TKA) or a medial unicompartmental arthroplasty
(UKA). For TKAs performed with primary patellar resurfacing, there was a higher ratio of satisfied patients
than for TKAs not resurfaced, but this increased ratio diminished with time passed since the primary operation.
Unrevised knees had a higher proportion of satisfied patients than knees that had been subject to revision, and
among patients revised for medial UKA, the proportion
of satisfied patients was higher than among patients revised for TKA.
We conclude that satisfaction after knee arthroplasty
is stable and long-lasting in unrevised cases and that
even after revision most patients are satisfied
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