Nucleon structure functions in noncommutative space-time

In the context of noncommutative space-time, we investigate the nucleon structure functions which plays an important role to identify the internal structure of nucleons. We use the corrected vertices and employ new vertices that appear in two approaches of noncommutativity and calculate the proton structure functions in terms of noncommutative tensor \theta_{\mu\nu}. To check our result, we plot the nucleon structure function (NSF), F_2(x), and compare it with experimental data and the result coming out from the GRV, GJR and CT10 parametrization models. We show that new vertex which is arising the noncommutativity correction will lead us to better consistency between theoretical result and experimental data for NSF. This consistency would be better at small values of x-Bjorken variable. To indicate and confirm the validity of our calculations, we also act conversely and obtain an lower bound for the numerical values of \Lambda_{NC} scale which are corresponding to the recent reports.Comment: 28 pages, 5 figure

Probe Branes Thermalization in External Electric and Magnetic Fields

We study thermalization on rotating probe branes in AdS_5 x S^5 background in the presence of constant external electric and magnetic fields. In the AdS/CFT framework this corresponds to thermalization in the flavour sector in field theory. The horizon appears on the worldvolume of the probe brane due to its rotation in one of the sphere directions. For both electric and magnetic fields the behaviour of the temperature is independent of the probe brane dimension. We also study the open string metric and the fluctuations of the probe brane in such a set-up. We show that the temperatures obtained from open string metric and observed by the fluctuations are larger than the one calculated from the induced metric.Comment: 27 pages, 7 figure

Groupwork in Active Learning Classrooms: Recommendations for Users.

This is a report of the third phase of a research study on students’ groupwork.  The two earlier phases of the research focused on the assessment and outcome of students’ groupwork in general, but at this phase the focus is on Active Learning Classrooms (ALCs). At this phase the author surveyed faculty and students about the effectiveness of various features of ALCs in facilitating students’ learning. Nine hundred and sixteen students and 53 faculty who were teaching and learning in these rooms responded to the two surveys.  The surveys assessed how active learning classrooms may facilitate students’ collaboration, what features of these classrooms are more helpful, and whether there is a difference between faculty and students in terms of effectiveness of these classrooms’ features. The results showed that both students and faculty strongly believe in the usefulness of these environments, while there are some differences in terms of student and faculty perspectives towards these rooms. Considering the results of all three phases of this research, a list of recommendations to improve the effectiveness of groupwork and ALCs is offered at the end

Dermatology residency selection criteria with an emphasis on program characteristics: a national program director survey.

Background. Dermatology residency programs are relatively diverse in their resident selection process. The authors investigated the importance of 25 dermatology residency selection criteria focusing on differences in program directors' (PDs') perception based on specific program demographics. Methods. This cross-sectional nationwide observational survey utilized a 41-item questionnaire that was developed by literature search, brainstorming sessions, and online expert reviews. The data were analyzed utilizing the reliability test, two-step clustering, and K-means methods as well as other methods. The main purpose of this study was to investigate the differences in PDs' perception regarding the importance of the selection criteria based on program demographics. Results. Ninety-five out of 114 PDs (83.3%) responded to the survey. The top five criteria for dermatology residency selection were interview, letters of recommendation, United States Medical Licensing Examination Step I scores, medical school transcripts, and clinical rotations. The following criteria were preferentially ranked based on different program characteristics: "advanced degrees," "interest in academics," "reputation of undergraduate and medical school," "prior unsuccessful attempts to match," and "number of publications." Conclusions. Our survey provides up-to-date factual data on dermatology PDs' perception in this regard. Dermatology residency programs may find the reported data useful in further optimizing their residency selection process

The relationship between the manners of parenting by parents and the extent of anxiety among the students

BACKGROUND: Mental health among the children and adolescents is an essential part of public welfare and health. The transfer of values and culture, and children health are made via training. According to conducted studies, training style of parents is an important factor to predict the health problems among the children. Baumrind has conducted extensive researches on the manner of parenting. He recognized three manners of parenting, authoritative, authoritarian, and permissive. These are different from each other in terms of control, and being hot. The aim of this research was to study the relationship of parenting manners of parent and the extent of anxiety among the students.METHODS: This was a correlation type research in which the relationship between the variables was obtained. Statistical population included boy students of the junior high schools in Ilam City, Iran. The sample was selected based on Morgan table, and included 100 students. They were randomly selected in a multistep process. We selected two schools among junior high schools in Ilam City using random sampling. Then, we selected second-grade class in every school.RESULTS: There was a positive and significant relationship between parenting manners (authoritative, authoritarian, and permissive manners) with anxious thoughts among the students (P < 0.010). In addition, there was a positive and significant relationship between permissive parenting manner and anxious thoughts among the students (P < 0.050). Independent variable explained 20% of changes in the dependent variable of anxious thoughts.CONCLUSION: The parenting manner influenced students, anxious thoughts at a significant level