88 research outputs found

    The Exact Potential Driving the Electron Dynamics in Enhanced Ionization

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    It was recently shown that the exact factorization of the electron-nuclear wavefunction allows the construction of a Schr\"odinger equation for the electronic system, in which the potential contains exactly the effect of coupling to the nuclear degrees of freedom and any external fields. Here we study the exact potential acting on the electron in charge-resonance enhanced ionization in a model one-dimensional H2+_2^+ molecule. We show there can be significant differences between the exact potential and that used in the traditional quasistatic analyses, arising from non-adiabatic coupling to the nuclear system, and that these are crucial to include for accurate simulations of time-resolved ionization dynamics and predictions of the ionization yield

    Socioeconomic Inequalities in Tobacco Smoking in Women Aged 15-54 in Iran: A multilevel model

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    Significant evidence suggests an inverse relationship between socioeconomic status and tobacco smoking, where inequality is visible among different social and economic strata. The aim of this study was to investigate the prevalence and economic and social inequalities in tobacco smoking in women aged 15-54 in Iran. This study is a cross-sectional study. Sampling in this study was a randomized clustered multistage sampling with equal clusters. A total of 35,305 women aged 15-55 enrolled in the study. Data analysis was in two stages. In the first stage, the social and economic inequalities were investigated using the concentration index and concentration curve method, and in the second method, and multilevel method was used to identify the determinants. The prevalence of tobacco smoking in women was 12.24%. The concentration index for smoking was CI = -0.07 [95% CI (-0.09, -0.05)], which represents smoking in people with low socioeconomic status. The results of the multilevel analysis indicated that the marital status of people over the age of 35 and the economic class was related to smoking in women. Inequality in tobacco smoking in women is to the interest of the well-off group, and this inequality varies in different provinces. Marital status, place of residence, age and socioeconomic status of women are factors influencing the prevalence of tobacco smoking in women, and these issues should be noticed to reduce inequalities

    Factors Influencing Patient Satisfaction in Shahroud Hospitals in 2018

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    Background: Patient satisfaction is one of important indicators of quality of service measurement. This study aimed at measuring patient satisfaction and factors which influence it in hospitals in Shahroud.Methods: In this cross-sectional study, 800 patients selected through random sampling were studied in public and private hospitals in 2018. The collected data were entered into SPSS 16 and analyzed using t-test and chi-square. The level of significance in all tests is 0.05.Results: Most of the inpatients were women and married people. The average score of satisfaction in the public hospitals affiliated to the University was 22.45 ± 6.02 and in the private sector, it was 21.56 ± 5, which is deemed moderate. Patients were the most dissatisfied with the daily change of patient dresses and bed covers (38.3%), hospital food quality (35.3%), room facilities (31.1%), and were the most satisfied with nursing behaviors (87.7%). Chi-square test showed a significant relationship between the type of hospital (P = 0.002), patients’ age (P = 0.037), education (P = 0.013), and residence (P = 0.012) with their satisfaction.Conclusion: Patients' satisfaction was moderate. Paying more attention to the domains such as daily change of clothes and bed covers, the quality of hospital food, and facilities of the patient's room can play a role in improving the satisfaction of patients

    Factors Influencing Patient Satisfaction in Shahroud Hospitals in 2018

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    Background: Patient satisfaction is one of important indicators of quality of service measurement. This study aimed at measuring patient satisfaction and factors which influence it in hospitals in Shahroud.Methods: In this cross-sectional study, 800 patients selected through random sampling were studied in public and private hospitals in 2018. The collected data were entered into SPSS 16 and analyzed using t-test and chi-square. The level of significance in all tests is 0.05.Results: Most of the inpatients were women and married people. The average score of satisfaction in the public hospitals affiliated to the University was 22.45 ± 6.02 and in the private sector, it was 21.56 ± 5, which is deemed moderate. Patients were the most dissatisfied with the daily change of patient dresses and bed covers (38.3%), hospital food quality (35.3%), room facilities (31.1%), and were the most satisfied with nursing behaviors (87.7%). Chi-square test showed a significant relationship between the type of hospital (P = 0.002), patients’ age (P = 0.037), education (P = 0.013), and residence (P = 0.012) with their satisfaction.Conclusion: Patients' satisfaction was moderate. Paying more attention to the domains such as daily change of clothes and bed covers, the quality of hospital food, and facilities of the patient's room can play a role in improving the satisfaction of patients

    Electronic non-adiabatic dynamics in enhanced ionization of isotopologues of hydrogen molecular ions from the exact factorization perspective

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    It was recently shown that the exact potential driving the electron's dynamics in enhanced ionization of H-2(+) can have large contributions arising from dynamic electron-nuclear correlation, going beyond what any Coulombic-based model can provide. This potential is defined via the exact factorization of the molecular wavefunction that allows the construction of a Schro "dinger equation for the electronic system, in which the potential contains exactly the effect of coupling to the nuclear system and any external fields. Here we study enhanced ionization in isotopologues of H-2(+) in order to investigate the nuclear-mass-dependence of these terms for this process. We decompose the exact potential into components that naturally arise from the conditional wavefunction, and also into components arising from the marginal electronic wavefunction, and compare the performance of propagation on these different components as well as approximate potentials based on the quasi-static or Hartree approximation with the exact propagation. A quasiclassical analysis is presented to help analyse the structure of different non-Coulombic components of the potential driving the ionizing electron.We acknowledge support from the European Research Council (ERC-2015-AdG-694097), Grupos Consolidados (IT578-13), and the European Union's Horizon 2020 Research and Innovation programme under grant agreement no. 676580. A. K. and A. A. acknowledge funding from the European Union's Horizon 2020 research and innovation programme under the Marie SklodowskaCurie grant agreement no. 704218 and 702406, respectively. N. T. M. thanks the National Science Foundation, grant CHE1566197, for support. Open Access funding provided by the Max Planck Society

    Cytochrome P450 2C19 Polymorphism in Iranian Patients with Coronary Artery Disease

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    <p><strong>BACKGROUND:</strong> The polymorphisms of cytochrome P450 2C19 (CYP2C19) gene are major prognostic factors for the response to clopidogrel therapy in patients with coronary artery diseases (CAD). The CYP2C19*2 is the most important allele responsible for resistance to clopidogrel therapy. This study examined CYP2C19 gene polymorphism (CYP2C19*1 and *2) in Iranian patients.</p> <p>&nbsp;</p> <p><strong>METHODS:</strong> This cross-sectional study was performed on 43 Iranian patients with CAD who underwent percutaneous coronary intervention (PCI) and received drug-eluted stents (DES). CYP2C19 polymorphisms were assessed using real time PCR and frequency of CYP2C19*1 and CYP2C19*2 were determined, and then homo- or heterozygous state of genes was detected by Melt Curve Analysis method.</p> <p>&nbsp;</p> <p><strong>RESULTS:</strong> Forty three patients (mean age = 58.8 &plusmn; 10.0 years, 79.1% male) participated in this study. CYP2C19*1/CYP2C19*1 genotype was observed in 31 (72.1%) of participates, CYP2C19*1/CYP2C19*2 genotype in 10 (23.3%), and CYP2C19*2/CYP2C19*2 genotype in 2 patients (4.7%). The frequency of CYP2C19*2 allele in the sample was 27.9%.</p> <p>&nbsp;</p> <p><strong>CONCLUSION:</strong> This study demonstrated a high prevalence of CYP2C19*2 gene polymorphism in Iranian patients. Further studies with larger samples or longitudinal are required to determine the effects of this polymorphism on the prognosis of CAD patients in our population.</p> <p>&nbsp;</p> <p><strong>Keywords:</strong> CYP2C19, Polymorphism, Clopidogrel, Coronary Artery Disease, Iran.</p> <p>&nbsp;</p

    Comparison of the Rey Auditory Verbal Learning Test (RAVLT) and Digit Test among Typically Achieving and Gifted Students

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    How to Cite This Article: Khosravi Fard E, Keelor JL, Akbarzadeh Bagheban AR, Keith RW. Comparison of the RAVLT and Digit Test with Typically Achieving and Gifted Students. Iran J Child Neurol. Spring 2016; 10(2):26-37.AbstractObjectiveIn this study, different kinds of memory were evaluated using Rey Auditory Verbal Learning (RAVLT) test and were compared between two groups of typical and gifted students using Digit Span test. Finally, we determined if working memory interfered with scores in different Rey stages or not.Material &amp; MethodsThis study was conducted in Tehran City, Iran in 2013. Scores on RAVLT were compared with WISC- R digit span results in a sample of 148 male students aged 12-14 yr old divided into two groups including 75 students in typical school (IQ ranging between 90 and 110) and 73 gifted students (IQs ranging between 110 and 130).ResultsGifted students obtained higher scores than typical students in both Forward Digit Span (FDS) and Backward Digit Span (BDS) and all 9 stages of RAVLT comparing with typical students (P&lt;0.001). There was no significant difference between different ages (P&gt; 0.05). The 14 yr old students in both groups had the highest score. There was a high correlation between FDS and the first stage of RAVLT as well as high correlation between BDS and seventh stage of RAVLT.ConclusionIntelligence has effect on better score of memory and gifted subjects had better scores in memory tests, although the intelligence effect in learning was quantitative rather than qualitative. RAVLT is a comprehensive test, which evaluates short-term memory, working memory and long-term memory and besides Digit span test provides precious information about memory and learning of subjects in order to program different student’s educational schedules. References1.C. Gordon Wells. Learning to talk: The pattern of Development. In: C. Gordon Wells, editor. The meaning makers: Children learning language and using language to learn: 1st ed. Heinemann Press 1986.P.22-34. 2.Ackerman PL, Beier ME, Boyle MO. Working memory and intelligence: The same or different constructs? Psychol Bull 2005;131(1):30.3. Spender J-C. Organizational knowledge, learning and memory: three concepts in search of a theory. JOCM 1996;9(1):63-78.4. Wechsler D. Intelligence: Definition, theory, and the IQ. In: Robert Cancro, editor. Intelligence: Genetic and environmental influences. Grune and Stratton Press 1971.P. 34-40.5. Erickson RP. Are Humans the Most Intelligent Species? J Intelligence 2014;2(3):119-21.6. Salminen T, Strobach T, Schubert T. On the impacts of working memory training on executive functioning. Front Hum Neurosci 2012;6(1); 143-150.7. Heitz RP, Unsworth N, Engle RW. Working memory capacity, attention control, and fluid intelligence. In: Oliver Wilhelm, Randall W. Engle, editors. Handbook of understanding and measuring intelligence. SAGE Publication. 2005:61-77.8. Engel de Abreu PM, Conway AR, Gathercole SE. Working memory and fluid intelligence in young children. Intelligence 2010;38(6):552-61.9. C.D.Woody; Some aspects of information processing in CNS; In: C.D. Woody (Ed.), Memory, learning, and higher function: a cellular view:1982, New York: Plenum Press. pp. 697–710).10. Yuan K, Steedle J, Shavelson R, Alonzo A, Oppezzo M. Working memory, fluid intelligence, and science learning. ERR 2006;1(2):83-98.11. Alloway TP, Archibald L. Working memory and learning in children with developmental coordination disorder and specific language impairment. LDX 2008;41(3):251-62. 12. Gathercole SE, Alloway TP. Working Memory and Learning; In: Gathercole SE editor. Working Memory and Learning: A practical guide for teachers. SAGE Publication Limited; 2008.13. Alloway TP. Working memory, but not IQ, predicts subsequent learning in children with learning difficulties. Europ J Psychol Assess 2009;25(2):92-8.14. Sternberg RJ. The concept of intelligence and its role in lifelong learning and success. Am Psychol 1997;52(10):1030-1037.15. Cornoldi C, Orsini A, Cianci L, GiofrĂš D, Pezzuti L. Intelligence and working memory control: Evidence from the WISC-IV administration to Italian children. Learn Individ Differ 2013; 26:9-14.16. Conway ARA, Cowan N, Bunting MF, Therriault DJ, Minkoff SRB. A latent variable analysis of working memory capacity, short-term memory capacity, processing speed, and general fluid intelligence. Intelligence 2002;30(2):163-83.17. Colom R, Abad FJ, Quiroga MÁ, Shih PC, Flores- Mendoza C. Working memory and intelligence are highly related constructs, but why? Intelligence 2008;36(6):584- 606.18. James W. Montgomery BMM, and Mianisha C. Finney.Working Memory and Specific Language Impairment: An Update on the Relation and Perspectives on Assessment and Treatment. Am J Speech Lang Pathol 2010;19:78-94. 19. Alloway TP AR. Investigating the predictive roles of working memory and IQ in academic attainment. JEChP. 2010;106:20-9.20. Matloubi S, Mohammadzadeh A, Jafari Z, Akbarzadeh Baghban A. Effect of background music on auditoryverbal memory performance. Audiology 2014:0-.21. Jafari ZS, Moritz PH, Zandi T, Akbari Kamrani AA. Malayeri S. Iranian version of the Rey Auditory Verbal Learning Test: a validation study. Arch Clin Neuropsychol 2009;20 (10), 621-628.22. Esther Strauss, Memory. In: Esther Strauss, Elisabeth M. S. Sherman, Otfried Spreen, editors. A Compendium of Neuropsychological Tests: Administration, Norms, and Commentary. 3rd ed. Oxford University Press. 2006. P.678-891.23. Talley JL. Memory in learning disabled children: Digit span and the Rey Auditory Verbal Learning Test. Arch Clin Neuropsychol 1986;1(4):315-22.24. Kyllonen PC, Christal RE. Reasoning ability is (little more than) working-memory capacity?! Intelligence 1990;14(4):389-433.25. Colom R, Flores-Mendoza C, Quiroga MÁ, Privado J. Working memory and general intelligence: The role of short-term storage. Pers Indiv Differ 2005;39(5):1005-14.26. Tillman CM, Nyberg L, Bohlin G. Working memory components and intelligence in children. Intelligence 2008;36(5):394-402.27. Hornung C, Brunner M, Reuter RA, Martin R. Children’s working memory: Its structure and relationship to fluid intelligence. Intelligence 2011;39(4):210-21.28. Colom R, Quiroga MÁ, Shih PC, MartĂ­nez K, Burgaleta M, MartĂ­nez-Molina A, et al. Improvement in working memory is not related to increased intelligence scores. Intelligence 2010;38(5):497-505.29. BĂŒhner M, Kröner S, Ziegler M. Working memory, visual–spatial-intelligence and their relationship to problem-solving. Intelligence 2008;36(6):672-80.30. Engle RW, Tuholski SW, Laughlin JE, Conway ARA. Working memory, short-term memory, and general fluid intelligence: a latent-variable approach. Clin Neuropsychol 1999;128(3):309.31. Alloway TP, Gathercole SE, Pickering SJ. Verbal and Visuospatial Short-Term and Working Memory in Children: Are They Separable? Develop Neuropsychol 2006;77(6):1698-716.32. McMinn MR, Wiens AN, Crossen JR. Rey auditoryverbal learning test: development of norms for healthy young adults. Clin Neuropsychol. 1988;2(1):67-87.33. Bolla-Wilson K, Bleecker ML. Influence of verbal intelligence, sex, age, and education on the Rey Auditory Verbal Learning Test. Dev Psychol 1986;2(3):203-11.34. Geffen G, Moar K, O’hanlon A, Clark C, Geffen L. Performance measures of 16–to 86-year-old males and females on the auditory verbal learning test. Clin Neuropsychol 1990;4(1):45-63.35. Van Der Elst W, Van Boxtel MP, Van Breukelen GJ, Jolles J. Rey’s verbal learning test: normative data for 1855 healthy participants aged 24-81 years and the influence of age, sex, education, and mode of presentation. Arch Clin Neuropsychol 2005;11(3):290-302.36. Bishop J, Knights RM, Stoddart C. Rey auditory-verbal learning test: Performance of English and French children aged 5 to 16. Arch Clin Neuropsychol 1990;4(2):133-40.37. van den Burg W, Kingma A. Performance of 225 Dutch school children on Rey’s Auditory Verbal Learning Test (AVLT): parallel test-retest reliabilities with an interval of 3 months and normative data. Arch CliN Neuropsycol 1999;14(6):545-59.38. Savage RM, Gouvier WD. Rey Auditory-Verbal Learning Test: The effects of age and gender, and norms for delayed recall and story recognition trials. Arch Clin Neuropsycol 1992;7(5):407-14.39. Sun X, Zhang X, Chen X, Zhang P, Bao M, Zhang D, et al. Age-dependent brain activation during forward and backward digit recall revealed by fMRI. Neuroimage 2005;26(1):36-47.40. Bleecker ML, Bolla-Wilson K, Agnew J, Meyers DA. Age-related sex differences in verbal memory. J Clin Psychol 1988;44(3):403-11.41. Hanakawa T HM, Okada T, Fukuyama H, Shibasaki H. Differential activity in the premotor cortex subdivisions in humans during mental calculation and verbal rehearsal tasks: a functional magnetic resonance imaging study. Neurosci Lett 2003, 347(3):199-201

    An improved method for fabrication of Ag-GO nanocomposite with controlled anti-cancer and anti-bacterial behavior; a comparative study

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    In this study, two green procedures for Silver-Graphene Oxide (Ag-GO) nanocomposite synthesis were investigated. As a common method, AgNO3 was first loaded on the GO surface and then was reduced and stabilized by walnut green husk extract, producing Ag-GO-I. As an innovative approach, GO was first exposed to the extract and then the AgNO3 was added as the second step, producing Ag-GO-Pi. Physicochemical properties, antibacterial and cytotoxicity activity of both nanocomposites were subsequently studied comparing with free silver nanoparticles (AgNPs) and pure GO. Based on the results, exposure of GO to the extract, as a reducing agent, at the first/last step of the synthesis process resulted in the fundamental differences in the final products. So that, high amounts of agglomerated silver nanoparticles were formed between the GO sheets, when using the common method, whereas in Ag-GO-Pi, small AgNPs were formed on the GO sheets without aggregation, entirely covering the sheets. Antibacterial and cytotoxic behavior of these nanomaterials could be compared as AgNPs > AgGO-Pi > Ag-GO-I. It is assumed that these differences are due to control of unwanted nucleation in the synthesis process that Ag nanoparticles are smaller with less agglomeration when the GO surfaces are pre-treated with reducing agent

    Characteristics of a good teacher in terms of students of health school in shahrekord university of medical sciences

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    Introduction: Although different characteristics of a good teacher have been presented by numerous Studies, efforts continue to determine common characteristic. In this study characteristics of a good Teacher regarding Viewpoints of students are evaluated. Method: In this descriptive, analytical and cross-Sectional study 140 health faculty students were selected through census sampling. Data gathering tool consists of a questionnaire with 24 options. Validity and reliability was confirmed by content validity and alpha kronbakh (0.87) respectively. Data was analysed by using Statistical t-Test, chi square, ANOVA, Kroskal valise and analysed variance (P<0.05) through SPSS software. Results: Findings show that, (%39) of participants were male , (%69). 1 Female, (%42.4) associates degree and (%57.6) Bachelors degree. Based on students View points, teachers proficiency with (%96.4) and general knowledge about specified lesson (%94.3) identified as the most important characteristics of a good teacher. The lowest importance belongs to hard-teacher (%61.9). There was significant difference between student's age and their viewpoints about presenting attractive materials, speaking eloquently, friendly relationship between teacher and students and Suitable eyecontact. Conclusion: different studies based on student's viewpoints identified some criteria for a good teacher in different domains, so attracting teacher's attention to these domains, Leads to attracting students trust, improving of educational function and effective teaching. Also, based on current research result and emphasizing on teachers proficiency in teaching specified material as the most important criteria for a good teacher, teachers should consider these characteristics in educational activities and try to motivate students and promote knowledge efficac

    Perfectionism and writing anxiety as predictors of Iranian EFL learners’ performance in IELTS writing module: a multi-dimensional perspective

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    This study aimed to investigate the relationship between Iranian EFL Learners’ perfectionism and writing anxiety and their performance in the IELTS Writing Module. To this end, sixty-eight Iranian EFL learners were selected via convenience sampling. Multidimensional Perfectionism Scale developed and validated by Hewitt and Flett (1991) and Second Language Writing Anxiety Inventory devised by Cheng (2004) were administered to the participants. The participants were then asked to write on an assigned topic from IELTS Writing Task 2. The findings of the study indicated that of the three dimensions of perfectionism (i.e., self-oriented, other-oriented and socially prescribed), none were associated with the learners’ writing performance, while a significant negative relationship was found between the learners’ writing anxiety consisting of somatic anxiety, cognitive anxiety, and avoidance behavior and their writing performance. The results of multiple regression analysis suggested that somatic anxiety, and avoidance behavior were significant predictors of writing performance. The implications highlight the strategies that should be deployed by educational policy-makers, practitioners, and examiners to alleviate anxiety in L2 classrooms, promoting a safe and stress-free educational environment
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