1,120 research outputs found
From Taub Numbers to the Bondi Mass
Taub numbers are studied on asymptotically flat backgrounds with Killing
symmetries. When the field equations are solved for a background spacetime and
higher order functional derivatives (higher order variational derivatives of
the Hilbert Lagrangean) are solved for perturbations from the background, such
perturbed space-times admit zeroth, first, and second order Taub numbers.
Zeroth order Taub numbers are Komar constants (upto numerical factors) or
Penrose-Goldberg constants of the background. For a Killing symmetry of the
background, first order Taub numbers give the contribution of the linearized
perturbation to the associated backgound quantity, such as the perturbing mass.
Second order Taub numbers give the contribution of second order perturbations
to the background quantity. The Bondi mass is a sum of first and second order
Taubs numbers on a Minkowski background.Comment: To appear in the proceedings of the 8th Marcel Grossmann Conferenc
Radiation effects on silicon Quarterly progress report, 1 Jul. - 30 Sep. 1966
Electrical conductivity and electron spin resonance experiments in study of radiation effects on silico
Radiation effects on silicon Sixth quarterly progress report, Apr. 1 - Jun. 30, 1966
Radiation effects on high purity n-type silicon solar cell
Radiation effects on silicon Summary report 1 Nov. 1965 - 20 Apr. 1967
Radiation-induced displacement effects measured in n and p type, low and high resistivity silico
Does Dance Therapy During Active Labor Reduce Labor Pain?
OBJECTIVE: The objective of this selective EBM review is to determine “Does dance therapy during active labor decrease labor pain?”
STUDY DESIGN: A systematic review of two randomized control trials and a cohort study that were published in English between 2014 and 2020.
DATA SOURCES: Three studies were obtained from PubMed, Alt HealthWatch, and AMED. They were all published in peer-reviewed journals and chosen based on their relevance to the clinical question proposed.
OUTCOMES MEASURED: The main outcome measured in all three studies is pain during active labor. Pain was measured in all studies using the visual analog scale (VAS). Participants were administered the VAS multiple times throughout active labor.
RESULTS: In the RCT by Abdolahain et al., there was significant reduction in pain when labor dance was performed compared to the control group The mean pain difference at 60 minutes was 0.43 with a statistically significant p-value of 0.036. The RCT by Gönenç et al. demonstrated a reduction in pain with labor dance compared to the control. This study reports a mean pain difference of 1.59 at 60 minutes and a statistically significant p-value of \u3c0.05 The cohort study by Akin et al. demonstrated a mean pain difference of 0.46 at 9cm of cervical dilation when comparing the labor dance to control groups, with a statistically significant p-value \u3c0.014.
CONCLUSIONS: All three studies reviewed demonstrated statistical significance based on calculated p-values. The results show labor dance is an effective strategy to reduce active labor pain. Future studies could be conducted in different geographical regions, cultures, focused on dance throughout pregnancies’ effect on labor pain, and evaluation of participants’ previous pain tolerance before labor
Stationary Wavelet Processing and Data Imputing in Myoelectric Pattern Recognition on a Low-Cost Embedded System
Pattern recognition-based decoding of surface electromyography allows for intuitive and flexible control of prostheses but comes at the cost of sensitivity to in-band noise and sensor faults. System robustness can be improved with wavelet-based signal processing and data imputing, but no attempt has been made to implement such algorithms on real-time, portable systems. The aim of this work was to investigate the feasibility of low-latency, wavelet-based processing and data imputing on an embedded device capable of controlling upper-arm prostheses. Nine able-bodied subjects performed Motion Tests while inducing transient disturbances. Additional investigation was performed on pre-recorded Motion Tests from 15 able-bodied subjects with simulated disturbances. Results from real-time tests were inconclusive, likely due to the low number of disturbance episodes, but simulated tests showed significant improvements in most metrics for both algorithms. However, both algorithms also showed reduced responsiveness during disturbance episodes. These results suggest wavelet-based processing and data imputing can be implemented in portable, real-time systems to potentially improve robustness to signal distortion in prosthetic devices with the caveat of reduced responsiveness for the typically short duration of signal disturbances. The trade-off between large-scale signal corruption robustness and system responsiveness warrants further studies in daily life activities
Radiation effects in silicon solar cells Quarterly report
Effect of lithium on production and annealing of damage in silico
Radiation effects in silicon solar cells Quarterly progress report, 1 Jul. - 30 Sep. 1970
Defects responsible for degradation in output of silicon solar cells irradiated by space radiatio
On the differential geometry of curves in Minkowski space
We discuss some aspects of the differential geometry of curves in Minkowski
space. We establish the Serret-Frenet equations in Minkowski space and use them
to give a very simple proof of the fundamental theorem of curves in Minkowski
space. We also state and prove two other theorems which represent Minkowskian
versions of a very known theorem of the differential geometry of curves in
tridimensional Euclidean space. We discuss the general solution for torsionless
paths in Minkowki space. We then apply the four-dimensional Serret-Frenet
equations to describe the motion of a charged test particle in a constant and
uniform electromagnetic field and show how the curvature and the torsions of
the four-dimensional path of the particle contain information on the
electromagnetic field acting on the particle.Comment: 10 pages. Typeset using REVTE
The role of antibiotics in the treatment of chronic prostatitis: A consensus statement
Practical guidelines for the diagnosis and treatment of chronic prostatitis are presented. Chronic prostatitis is classified as chronic bacterial prostatitis (culture-positive) and chronic inflammatory prostatitis (culture-negative). If chronic bacterial prostatitis is suspected, based on relevant symptoms or recurrent UTIs, underlying urological conditions should be excluded by the following tests: rectal examination, midstream urine culture and residual urine. The diagnosis should be confirmed by the Meares and Stamey technique. Antibiotic therapy is recommended for acute exacerbations of chronic prostatitis, chronic bacterial prostatitis and chronic inflammatory prostatitis, if there is clinical, bacteriological or supporting immunological evidence of prostate infection. Unless a patient presents with fever, antibiotic treatment should not be initiated immediately except in cases of acute prostatitis or acute episodes in a patient with chronic bacterial prostatitis. The work-up, with the appropriate investigations should be done first, within a reasonable time period which, preferably, should not be longer than 1 week. During this period, nonspecific treatment, such as appropriate analgesia to relieve symptoms, should be given. The minimum duration of antibiotic treatment should be 2-4 weeks. If there is no improvement in symptoms, treatment should be stopped and reconsidered. However, if there is improvement, it should be continued for at least a further 2-4 weeks to achieve clinical cure and, hopefully, eradication of the causative pathogen. Antibiotic treatment should not be given for 6-8 weeks without an appraisal of its effectiveness. Currently used antibiotics are reviewed. Of these, the fluoroquinolones ofloxacin and ciprofloxacin are recommended because of their favourable antibacterial spectrum and pharmacokinetic profile. A number of clinical trials are recommended and a standard study design is proposed to help resolve some outstanding issues
- …