Anderson localisation in steady states of microcavity polaritons

We present an experimental signature of the Anderson localisation of microcavity polaritons, and provide a systematic study of the dependence on disorder strength. We reveal a controllable degree of localisation, as characterised by the inverse-participation ratio, by tuning the positional disorder of arrays of interacting mesas. This constitutes the realisation of disorder-induced localisation in a driven-dissipative system. In addition to being an ideal candidate for investigating localisation in this regime, microcavity polaritons hold promise for low-power, ultra-small devices and their localisation could be used as a resource in quantum memory and quantum information processing.Comment: 7 pages, 3 figure

Dynamics of transversally vibrating non-prismatic Timoshenko cantilever beams

TurkAz Enerji Lt

A study of frequency band structure in two-dimensional homogeneous anisotropic phononic K 3 -metamaterials

British council - Kiev under the Academic Partnership/Mobility Grant scheme grant No. UKR16EG/3/19.01.16

Cross Feshbach resonance

Feshbach resonance occurs when a pair of free particles is resonantly coupled to a molecular bound state. In the field of ultracold quantum gases, atomic Feshbach resonances became a usual tool for tailoring atomic interactions opening up many new applications in this field. In a semiconductor microcavity, the Feshbach resonance appears when two lower polaritons are coupled to the molecular biexciton state. Here, we demonstrate the existence of a cross Feshbach resonance for which a pair of polaritons, lower together with upper, effectively couples to the biexciton state. This demonstration is a crucial step towards the efficient generation of entangled photon pairs in a semiconductor microcavity. The existence of a Cross Feshbach resonance establishes the condition to convert a pair of upper and lower polaritons via the biexciton state into two lower polaritons, paving the way for the generation of momentum and polarization entangled photons.Comment: 7 pages, 3 figure

Moderating the Effect of Perfectionism on the Relationship between Personality Traits, Life Satisfaction, and Psychological Well-Being

The current study is aimed to determine the moderating effect of perfectionism on the relationships between personality traits with life satisfaction and psychological well-being. Research population was all undergraduate students of Islamic Azad University of Tehran while 140 students were selected through multi-level clustering sampling. Data were collected through psychological well-being questionnaire (RSPWB-18), perfectionism list of Hill, short form questionnaire of personality traits of NEO (NEO-FFI) and life satisfaction questionnaire (SWLS) and were analyzed in two sections of descriptive (mean and standard deviation) and inferential (Pearson correlation and stepwise regression). The results showed that personality traits and perfectionism has significant statistical relationship P<0.01 and F (11 and 128) = 9.01 with psychological well-being and only the variables of neuroticism, extroversion, agreeableness, and conscientiousness were the aspects of personality traits and objectively, high standards and perception of pressure were the aspects of perfectionism predictor of psychological well-being. Personality traits and perfectionism with life satisfaction have significant statistical relationship P<0.01 and F (11 and 128) = 5.59 and perfectionism is mediator between personality traits and life satisfaction or it has moderating effect on this relationship. Only neuroticism, extroversion were the aspects of personality traits and interpersonal sensitivity and being excellent were the aspects of predictor perfectionism of life satisfaction and there is significant statistical relationship among life satisfaction with self-acceptance, dominating on environment and total score of psychological well-being and there aren’t any significant relationships among other aspects of psychological well-being

HIV prevalence and related risk behaviours among female sex workers in Iran: results of the national biobehavioural survey, 2010

Objectives To determine the prevalence of HIV and related behavioural risks among Iranian female sex workers (FSW) via the first national biobehavioural surveillance survey. Methods In 2010, 1005 FSW were approached and 872 recruited using facility-based sampling from 21 sites in 14 cities in Iran. We collected dried blood samples and conducted face-to-face interviews using a standardised questionnaire. Data were weighted based on the response rate and adjusted for the clustering effect of the sampling site. Adjustment was performed by weighting based on the sampling fraction of each site using a prior estimate of its total size of the FSW population. Results The prevalence of HIV infection (95% CI) was 4.5% (2.4 to 8.3) overall, 4.8% (2.2 to 9.8) among those who had reported a history of drug use and 11.2% (5.4 to 21.5) among those who had a history of injection drug use. The frequencies of condom use in the last sexual act with paying clients and non-paying partners were 57.1% and 36.3%, respectively. Any drug use was reported by 73.8% of participants, and among this subgroup, 20.5% had a history of injection drug use. Conclusions The prevalence of HIV was considerable among FSW particularly those who had a history of drug injection. A combination of prevention efforts addressing unsafe sex and injection are needed to prevent further transmission of HIV infection

Finite element analysis of wind turbine blade vibrations

The article is devoted to the practical problem of computer simulation of the dynamic behaviour of horizontal axis wind turbine composite rotor blades. This type of wind turbine is the dominant design in modern wind farms, and as such its dynamics and strength characteristics should be carefully studied. For this purpose, in this paper the mechanical model of a rotor blade with a composite skin possessing a stiffener was developed and implemented as a finite element model in ABAQUS. On the basis of this computer model, modal analysis of turbine blade vibrations was performed and benchmark cases for the dynamic response were investigated. The response of the system subjected to a uniform underneath pressure was studied, and the root reaction force and blade tip displacement time histories were obtained from the numerical calculations conducted

Prevalence of Active and Passive Smoking among Adult Population: Findings ‎of a Population-Based Survey in Kerman (KERCADR), Iran

Background: Smoking is one of the major modifiable non-communicable disease risk factors. Our aim was to report the pattern of active and passive smoking using the data collected through a population base household survey in Kerman, Iran. Methods: Given a cluster random sampling design, we recruited 5900 adult populations (15-75 years old) into a survey. After consenting, every participant was interviewed by a trained interviewer. The section for smoking had questions about daily (smoking at least one cigarette/day), non-daily, past and passive cigarette smoking as well as the time of exposure to cigarette’s smoke. We used Kerman population distribution (as the target population) to adjust our estimates using direct standardization method. Findings: Overall, 8.3% of study participants (15.5% in men vs. 0.8% in women, P = 0.010) reported themselves as daily smokers and 1.7% (2.9% in men vs. 0.4% in women, P = 0.010) as non-daily smokers. The passive smoking was common in total (27.5%), while women experienced more exposure than men (30.1% vs. 25.0%, P = 0.010). 3.2% of daily smokers smoked more than 20 cigarettes/day. Among passive smokers, 62.6% were exposed to cigarette smoke more than 6 days/week. Conclusion: Smoking is pretty common among adult populations, particularly men. A majority of tobacco-free young adult women are exposed to passive smoking. Age and gender oriented interventions are required to change this risk pattern in our community to prevent from further smoking related morbidities and mortalities

Predictors of Learning Styles in Students of Kerman University of Medical Sciences, Iran

Background & Objective: Learning style is a distinct behavior for gaining knowledge and skills through study or experience. Personality is a series of relatively stable characteristics which distinguish a person from others. The key to involving learners in the learning process is their preferences and learning styles, and identifying factors affecting these variables. In this regard, the predictor variables of learning styles must be accurately identified so as to improve educational conditions. This study aimed to determine factors predictive of learning styles of the students of Kerman University of Medical Sciences, Iran. In addition, the impact of demographic factors on their characteristics will be discussed. Methods: This was a cross-sectional study. Data collection was performed by a questionnaire including demographic data, personality test (NEO), the Learning style inventory, and the Kolb Learning Style Questionnaire. For data analysis, central tendency and dispersion measures, chi-square, Spearman correlation coefficient, and logistic regression tests were used. Results: The results show that most of the participants in this study were single women. Mean age of participants was 21.41 ± 2.96 years. Most students (44.31%) used assimilating learning style. Based on the results of these personality types, nearly a third of students (28.2%) were of the conscientious (responsible) character type. The results showed that only gender is a predictor of learning styles. Conclusion: More attention to students' learning styles results in the perfect use of teaching practices, and increasing and enhancement of students’ capabilities. Moreover, by identifying students' preferred learning styles and changing teaching methods, the students' enthusiasm for learning can be increased. Keywords Learning styles Personality Ira

Coherent and incoherent aspects of polariton dynamics in semiconductor microcavities

The interaction between coherent polaritons and incoherent excitons plays an important role in polariton physics. Using resonant pump-probe spectroscopy with selective excitation of single polariton branches, we investigate the different dephasing mechanisms responsible for generating a long-lived exciton reservoir. As expected, pumping the upper polariton results in a strong dephasing process that leads to the generation of a long lived reservoir. Unexpectedly, we observe an efficient reservoir creation while exciting only the lower polariton branch when the detuning is increased towards positive detuning. We propose a simple theoretical model, the polaritonic Bloch equations, to describe the dynamics of the system