323,248 research outputs found
STUDY OF BIFURCATION ANALYSIS FOR DYNAMIC VOLTAGE STABILITY IN POWER SYSTEM
No full text N . Amjady1, * , M . R . Ansari Shahreza2    1 . Professor , Electrical & Computer Engineering Faculty , Semnan University , Semnan, Iran  2 . M . Sc. Student , Electrical & Computer Engineering Faculty, Semnan University, Semnan, Iran  * Corresponding Author: [email protected]   Abstract  Voltage collapse is an inherently nonlinear phenomenon and it is suitable to use nonlinear analysis techniques such as bifurcation theory to study voltage collapse and to devise ways of avoiding it. For a power system, there are three different kinds of bifurcation points: the singularity induced bifurcation, saddle-node and hopf bifurcation.These three bifurcation sets are the boundary of the feasible region of the power system stability. When one equilibrium point passes through the boundary, the system will lose its stability. This paper focuses on bifurcation analysis for dynamic voltage stability. It also studies the eigenvalues behavior of the power system close to bifurcation points. This paper considers both unreduced Jacobian matrix eigenvalues and reduced ones, and it compares their results, too. MATLAB software has been used in this paper.    Keywords: Voltage C ollapse, Voltage S tability, Bifurcation A nalysis, Unreduced Jacobian M atrix, Reduced Jacobian M atri
Temporal Trend and Spatial Distribution of Drug Poisoning in Semnan Province: A Retrospective Longitudinal Study
No full textBackground: Substance abuse and the risks of its consequences are the major public health problems in the world and Iran. Objectives: The objective of the present study is determination the epidemiological status and spatial distribution of high-risk and low-risk clusters along with estimating the relative risk of drug poisoning in Semnan in 8 years. Methods: A descriptive-analytical and retrospective longitudinal study was conducted that examined all 3360 poisoned patients who referred to the hospitals of Semnan province from 2011-2018. The total number of visits was received and analyzed by year with the relevant diagnostic code in ICD-10 from hospitals of the province, and data were analyzed using Joinpoint regression analysis, global Moran’s index and Kuldorff’s spatial statistic scan at a significant level of 0.05. Results: The number of clients varied from 219 in 2011 to 570 in 2015. The patients’ mean age was 26.7 years. The average annual number of cases per one hundred thousand individuals (annual cases/100000) was 598.4. The AAPC of the incidence of drug poisoning was 9.8 and significant in the whole province, demonstrating that the incidence of poisoning increased by an average of 9.8 per year in the whole province from 2011 to 2018. Semnan County with LLR = 533.07 was the most likely low-risk cluster, and Shahroud County was the most likely high-risk cluster with LLR = 219.94. Conclusions: Drug policies need to be adapted to the geographical differences in the place death. After clustering regions in poisoning incidents, the necessary interventions can be concentrated for these specific geographical locations. © 2022, Author(s)
Short Communication: Survey on mycobacteriosis on goldfish and guppy species in Semnan, using PCR assay
No full textMycobacteriosis or fish tuberculosis a chronic or acute, systemic, granulomatous disease in fish that occurs due to nontuberculous mycobacteria and affect all fish species. Families of Cyprinidae, Anabantidae and Characidae appears to be more susceptible to mycobacteriosis. This survey was was carried out to investigate the mycobacterial infection of ornamental fish of Semnan. 30 pieces of goldfish and 30 pieces of guppy were collected from aquarium shops of Semnan and sampled. These samples contain kidney liver and spleen. Detection of mycobacteria from extracted DNA was done, using PCR assay. Partial primer was used to identify the rpoB gene. Results showed contamination of 10% of guppies and 46.66% of goldfish. In DNA sequencing some of the bacterial species was recognized as Mycobacterium fortuitum. In conclusion ornamental fish of Semnan are contaminated with nontuberculous mycobacteria. Considering the zoonotic risk of this disease, results of this survey is important to the general hygiene. Investigating the other areas of Semnan province is offered.Publishe
HUMAN FACE DETECTION IN COLORED IMAGES BASED ON GAUSSIAN FILTERS
No full text A. N asrabadi1,*, S. Azadi2, J. Haddad Nia3    1. Lecturer, Electrical Engineering Dep., Engineering Faculty, Tarbiat Moallem University of Sabzevar, Sabzevar, Iran  2. Assistant Professor , Electrical& Computer Engineering Faculty, Semnan University, Semnan, Iran  3. Assistant Professor , Electrical Engineering Dep., Engineering Faculty, Tarbiat Moallem University of Sabzevar, Sabzevar, Iran  * Corresponding Author : [email protected]    Abstract  In this article a recommended method is introduced for face recognition in colored images, based on combination of template matching, conversions of color filter. In this method, firstly based on the recommended Gaussian filter, skin points of image based on a cluster including all the elements of skin are determined and by extraction of color elements, the standard of skin color separation is determined. Then the linked areas similar to skin color that are separated from different parts of image are introduced as recognized face by template matching and based on a model. The results of simulation on an induced images bank show that the above mentioned method has not only a low positive and negative mean error but also a high resistance against noise.    Keywords: Face Detection, Skin Model, YCbCr Colored Space, Gaussian Filter, Template Matching.
Factors Affecting Job Motivation from the Viewpoints of Staff and Managers in Semnan Welfare Organization
No full textObjectives: Regarding the type of service receivers as well as the technicality of the services provided, these services often bear high complexity and difficulty which can eventually lead to job burnout and shortage of motivation in the staffIn this study, the factors affecting job motivation from the viewpoints of staff and managers of Semnan Welfare Organization have been identified and possible differences have been analyzed.
Methods: In the present study, based on Herzberg’s model of job motivation and considering several assessment tools produced according to this model, a draft of a researcher-designed questionnaire was prepared in order to determine the factors affecting job motivation in the staff and managers of the State Welfare Organization in Semnan province. The content and face validity of the questionnaire was determined and approved by 10 experts, 5 managers and 15 staff members of the Semnan Welfare Organization who were selected purposefully, using the Lawsche’s method. The reliability of the questionnaire was assessed and approved by test-retest correlation coefficient determination. After informed consent was obtained, all staff and managers conforming to the inclusion criteria were invited to participate in the study and to complete the questionnaire.
Results: In contrast to Herzberg’s theory which considers intrinsic factors as more important than extrinsic factors in causing motivation, our results demonstrated that staff and managers of Semnan Welfare Organization believed extrinsic factors provoked higher motivation.
Discussion: The major motivation factors for staff and managers of Semnan Welfare province were somehow related to management practices of managers and staff, both of which are categorized as extrinsic factors
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A Contribution to the Knowledge of Whiteflies (Hemiptera: Aleyrodidae) in Khorasan and Semnan Provinces, Iran
No full textWhiteflies (Hemiptera: Aleyrodidae) are some of the most potentially detrimental pests for agricultural crops and the ornamental plant industry in Iran. The present paper deals with the faunistic survey of whiteflies in two provinces of Iran, Khorasan and Semnan. During the survey a total of 16 species from 12 genera were collected and identified. Distribution data are given for the species
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
