Scattering in Noncommutative Quantum Mechanics

We derive the correction due to noncommutativity of space on Born approximation, then the correction for the case of Yukawa potential is explicitly calculated. The correction depends on the angle of scattering. Using partial wave method it is shown that the conservation of the number of particles in elastic scattering is also valid in noncommutative spaces which means that the unitarity relation is held in noncommutative spaces. We also show that the noncommutativity of space has no effect on the optical theorem. Finally we study Gaussian function potential in noncommutative spaces which generates delta function potential as $\theta \to 0$.Comment: 7 Pages, no figure, accepted for publication in Modern Physics Letters

Identifiability of generalised Randles circuit models

The Randles circuit (including a parallel resistor and capacitor in series with another resistor) and its generalised topology have widely been employed in electrochemical energy storage systems such as batteries, fuel cells and supercapacitors, also in biomedical engineering, for example, to model the electrode-tissue interface in electroencephalography and baroreceptor dynamics. This paper studies identifiability of generalised Randles circuit models, that is, whether the model parameters can be estimated uniquely from the input-output data. It is shown that generalised Randles circuit models are structurally locally identifiable. The condition that makes the model structure globally identifiable is then discussed. Finally, the estimation accuracy is evaluated through extensive simulations

Berry's phase in noncommutative spaces

We introduce the perturbative aspects of noncommutative quantum mechanics. Then we study the Berry's phase in the framework of noncommutative quantum mechanics. The results show deviations from the usual quantum mechanics which depend on the parameter of space/space noncommtativity.Comment: 7 pages, no figur

An Appropriate Candidate for Exact Distribution of Closed Random Walks using Quantum Groups

We show that the structure of the quantum group $su_{q}(2)$ is intimately related to the random walks on a two dimentional lattice. Using this connection we obtain an appropriate candidate for the exact area distribution of closed random walks of length $N$ on a two dimensional square lattice. We compare our results with exact enumeration.Comment: 7 pages, 3 figure

Effect of a Family-Oriented Communication Skills Training Program on Depression, Anxiety, and Stress in Older Adults: A Randomized Clinical Trial

Background: Older adults face several physical and psychological problems such as hearing loss, vision loss, and memory loss, which diminish the quality of their communication. Poor communication in turn affects their psychological wellbeing and induces substantial depression, anxiety, and stress. The family has an important role in the mental health of older adults. Objectives: This study aimed to investigate the effect of a family-oriented communication skills training program on depression, anxiety, and stress in older adults. Patients and Methods: For this randomized controlled clinical trial, we enrolled 64 older adults from two healthcare centers affiliated to the Isfahan University of Medical Sciences. The subjects were randomly allocated to an experimental group (n = 32) and a control group (n = 32). In the experimental group, older adults along with their primary caregiver participated in six sessions of communication skill education. The control group participated in two training sessions on nutrition and exercise. All participants answered the DASS21 questionnaire three times—at the start of the study, at the end of the sixth week, and a month after the last educational session of the experimental group. Data were analyzed using chi-square, Fisher’s exact and t tests and by repeated measures analysis of variance (ANOVA). Results: In the experimental group, the mean depression score significantly reduced from 10.56 ± 3.34 before intervention to 7.46 ± 2.80 and 6.30 ± 2.75 after intervention and at follow-up, respectively; the mean anxiety score significantly reduced from 8.46 ± 1.88 before intervention to 5.83 ± 1.93 and 5.80 ± 2.12 after intervention and at follow-up, respectively; and the mean stress score significantly decreased from 11.40 ± 4.53 before intervention to 8.90 ± 3.81 and 8.43 ± 3.31 after intervention and at follow-up, respectively (P < 0.05 for all three domains). In contrast, the control group did not show any significant change in the mean depression, anxiety, and stress scores. Conclusions: Family-oriented education on communication skills could reduce depression, anxiety, and stress in the elderly. Therefore, such programs should be adopted as a non-pharmacological and cost-effective method for reducing depression, anxiety, and stress in older adults

Improved sensitivity RF photonics doppler frequency measurement system

An improved sensitivity Doppler frequency measurement system based on microwave photonics technology was demonstrated practically. The system employs a four-wave mixing effect to achieve broad radio-frequency (RF) frequency measurement. In addition, a lock-in amplification technique was utilized to achieve high-measurement sensitivity. The system is, thus, capable of Doppler frequency estimation of radar echoes with a carrier frequency up to 40 GHz and a power level as low as $-$35 dBm. © 2009-2012 IEEE