303 research outputs found
LOWER BOUNDS FOR A POLYNOMIAL ON A BASIC CLOSED SEMIALGEBRAIC SET USING GEOMETRIC PROGRAMMING
No full textAbstract. Let f, g1,..., gm be elements of the polynomial ring R[x1,..., xn]. The paper deals with the general problem of computing a lower bound for f on the subset of Rn defined by the inequalities gi ≥ 0, i = 1,...,m. The paper shows that there is an algorithm for computing such a lower bound, based on geometric programming, which applies in a large number of cases. For example, the algorithm computes a lower bound for f on a hypercube ∏n i=1[−Ni, Ni], or, more generally, on any product of hyperellipsoids of a suitable form. The algorithm extends and generalizes earlier algorithms of Ghasemi and Marshall, dealing with the case m = 0, and of Ghasemi, Lasserre and Marshall, dealing with the case m = 1 and g1 = M − (xd1 + · · ·+ xdn). Here, d is required to be an even integer ≥ max{2, deg(f)}. The algorithm is implemented in a SAGE program developed by the first author. The bound obtained is typically not as good as the bound obtained using semidefinite programming, but it has the advantage that it is computable rapidly, even in cases where the bound obtained by semidefinite programming is not computable. 1
Mean flow generation by Görtler Vortices in a rotating annulus with librating side walls
No full textLongitudinal libration of the cylinder side walls of a rotating annulus in the supercritical regime induces a centrifugally unstable Stokes boundary layer which generates Görtler vortices only in a portion of a libration cycle. We show for the first time that these vortices propagate into the fluid bulk and generate an azimuthal mean flow which is retrograde (prograde) over the outer (inner) cylinder side wall. Direct numerical simulations (DNS) are carried out and Reynolds-averaged equations and kinetic energy budget of mean and fluctuating flow are used as diagnostic equations to discuss the generation mechanism and scaling behavior of the azimuthal mean flow in the fluid bulk
Mean Flow generation due to longitudinal librations of side-walls of a rotating annulus
No full textLaboratory experiments with rotating annuli are reported that reveal a prograde jet, which is adjacent either to a (longitudinally) librating inner straight cylinder or to a librating inner truncated cone (frustum), whereas the outer cylindrical wall and bottom and top lids rotate with constant angular velocity. In the frustum case, the jet is located on a straight cylindrical surface which is circumscribed about the frustum and joins the bottom lid. These findings are supported by direct numerical simulations which show good agreement between experimental data and numerical results and, when the centrifugal instability of the Stokes boundary layer near the oscillating sidewall does not set in, highlight the important role of local dynamical processes in the corners, between the inner cylinder and the lids, in producing the prograde jet
DNS of inertial wave attractors in a librating annulus with height-dependent gap width
No full textDirect numerical simulations (DNS) of inertial wave attractors have been carried out in a librating Taylor-Couette system with broken mirror symmetry in the radial-axial cross-section. The inertial wave excitation mechanism and its localisation at the edges was clarified by applying boundary layer theory. Additional resonance peaks in the simulated response spectra were found to agree with low-order wave attractors obtained by geometric ray tracing. Numerics and theory are in qualitative agreement with recent lab experiments
Role of Organizational Culture and Implementing the Critical Success Factors Resulting in Reduced Medical Errors from the Viewpoint of Nurses: organizational culture and critical success factors in reducing medical errors
No full textBackground and Aim: A set of management practices called critical success factors and organizational culture can lead to a misplaced program for reaching a goal in the hospital. The incidence of medical errors, one of the most important issues influenced by multiple factors, undermines the quality of healthcare provision and satisfaction and increases costs. Considering that medical errors constitute 44,000-98,000 of the annual deaths in the United States and the lack of reliable statistics in Iran, we aimed to examine the roles of organizational culture and critical success factors in reducing medical errors.
Materials and Methods: This applied cross-sectional study was performed among the staff of hospitals affiliated with Arak University of Medical Sciences, Arak, Iran. A 44-item questionnaire was used to collect the data. The questionnaire was designed based on the studies by McFadden, Cameron, and Quinn, and Gowen, and Tallon, the validity and reliability of which were confirmed in this study. Descriptive (frequency distribution) and inferential statistics (ANOVA,two-sample-test, and linear regression) were employed to analyze the data in SPSS, version.
Ethical Considerations: The informed consent was obtained from participants after explaining the research aims and the participants were assured about the confidentiality of information.
Findings: Most of the respondents were women (58.1%) and within the 30-40 years age group (52.5%). Further, 50.4% of the participants had a Bachelor’s degree. Two main hypotheses and 10 sub-hypotheses were tested and partially accepted. Our results suggested that staff participation, error report, cultural change, education and training, statistical reports, system redesign, collaborative culture, hierarchical culture, mission culture, compatibility culture, and implementation of critical success factors can contribute to reducing errors.
Conclusion: Hospital managers must try to encourage the development and maintenance of a culture that emphasizes interpersonal relationships, development of human resources, mentoring co-workers, teamwork and participation, trust, and commitment. To this end, hospital managers should recognize the role of organizational maturity in reducing medical errors and encourage employees to develop organizational culture and increase organizational maturity.
*Corresponding Author: Morteza Ghasemi; Email: [email protected]; ORCID: https://orcid.org/0000-0002-2142-801X
Please cite this article as: Rahbarpour MR. Meaning and Conception of Bioethics and its Realm. Bioeth Health Law J. 2021; 1:1-8 (e20). http://doi.org/10.22037/bhl.v1i1.38178
 
The Image of Others in Savushun
No full textThe novel of Savushun by Simin Daneshvar is one of the most significant Persian novels ever written. This novel deals with an important period in Iranâs political and cultural history and portrays the presence of foreigners in this country. Images of others dominate Savushun . We can also see a negative image of Britain and its allies as they invaded and occupy parts of southern Iran and plundered peopleâs property. Only Ireland is portrayed fairly positively in the minds of the novelâs characters. Daneshvar has painted quiet a negative image of the uncivilized Indian mercenaries in Savushun. The image of Iranians is crystallized in the character of âJosefâ â the novelâs hero âwho fights for freedom and independence and becomes a martyr on the path to reach a noble goal.
BODY POLITICS
No full textBody Politics brings together thirteen contemporary Iranian artist-filmmakers whose work explore notions of womanhood, female gaze, body-memory and body technology, informed by geographical and geopolitical conditions.
Curated by Mania Akbari and Amir Ali Ghasemi, this program hopes to provide a counter narrative to the tired image of the Iranian female artist as seen not only in the mainstream media but also in the art world. Featuring work by Mehraneh Atashi, Negar Behbahani, Bahar Behbahani, Nebras Hoveizavi, Mona Kakanj, Simin Keramati, Shahrzad Malekian, Bahar Noorizadeh, Anahita Razmi, Bahar Samadi, Niloofar Taatizadeh, Jinoos Taghizadeh and Maryam Tafakory, this program is defined not by the films’ location-specificity but a diversity of conceptual and experiential approaches in tackling the question of body as the site of politics.
Panel discussion with Mania Akbari, Minou Norouzi, Bahar Noorizadeh and Maryam Tafakory
Onchodellus squamosus
No full textOnchodellus squamosus (Koroleva, 1977) Pachylaelaps squamosus Koroleva, 1977a: 134. Pachylaelaps squamosus.— Koroleva, 1977b: 444. Onchodellus squamosus.— Mašán, 2007: 111; Mašán & Halliday, 2014: 20. Using the identification key prepared by Mašán (2007), this species was identified and reported by Mojahed et al. (2017), because all key morphological characteristics fitted O. squamosus. Mašán (January 2017, personal communications) informed the senior author (AA) that this specimen should be conspecific with that species which was identified and illustrated as O. siculus by Koroleva (1977a), then listed as a misidentification by Mašán & Halliday (2014). Therefore, it represents an undescribed species. By this reason, O. squamosus was removed from the acarofauna of Iran.Published as part of Ahadiyat, Ali, Moghadam, Sahebeh Ghasemi, Kermani, Reyhaneh Abutaleb & Harchi, Omid Jo-, 2020, Review of the Iranian species of Pachylaelapidae, with description of a new species of Onchodellus (Acari: Mesostigmata) in Zootaxa 4778 (1), DOI: 10.11646/zootaxa.4778.1.2, http://zenodo.org/record/382364
PARAMOUNT: parallel modal analysis of large datasets
No full textPARAMOUNT: parallel modal analysis of large datasets
PARAMOUNT is a python package developed at University of Twente to perform modal analysis of large numerical and experimental datasets. Brief video introduction into the theory and methodology is presented here.
Features
- Distributed processing of data on local machines or clusters using Dask Distributed
- Reading CSV files in glob format from specified folders
- Extracting relevant columns from CSV files and writing Parquet database for each specified variable
- Distributed computation of Proper Orthogonal Decomposition (POD)
- Writing U, S and V matrices into Parquet database for further analysis
- Visualizing POD modes and coefficients using pyplot
Using PARAMOUNT
Make sure to install the dependencies by running `pip install -r requirements.txt`
Refer to csv_example to see how to use PARAMOUNT to read CSV files, write the variables of interest into Parquet datasets and inspect the final datasets.
Refer to svd_example to see how to read Parquet datasets, compute the Singular Value Decomposition, and store the results in Parquet format.
To visualize the results you can simply read the U, S and V parquet files and your plotting tool of choice. Examples are provided in viz_example.
Author and Acknowledgements
This package is developed by Alireza Ghasemi ([email protected]) at University of Twente under the MAGISTER (https://www.magister-itn.eu/) project. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 766264.</p
The capabilities of computers for language learning
No full textAbstractComputer as a medium for language learning has been acknowledged by many educators in the past years. Using computers for language learning has proved not only interesting but also positive and stimulating for many language teachers and learners. The present paper tries to show the impact/s of computers in the field of second and foreign language learning. First of all, the advantages inherent in the use of computers for language learning will be discussed. Secondly, the technical preparation and requirements of language teachers and learners for the use of computers will be presented. And finally, the application of computers in the development of the four language skills will be analysed. We illustrate the computer capabilities to support different classroom activities, group-work and pair-work tasks; independent work; to stimulate student-centered learning and the individualization in language learning
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