Publication Date: 2022
Research in Contemporary World Literature/ Pazhuhesh-e Zabanha-ye Khareji (25884131)27(1)pp. 174-206
Today, it has been evident that without having a theory or a definite approach either to literature & history, writing a history of literature becomes totally impossible. Despite the initial contradiction between formalistic & historical methodologies, systemic formalism could be recognized as a pioneer movement which could formulate a definite methodological framework for history writing of literature. With such a perspective in mind, systemic formalism projected some terms as: evolution, change, historical dynamism, canonicity, dominant trait, system & so on. This approach, in spite of the criticisms made against it, took the first steps in bridging the gap between synchronic & diachronic studies in literature. Moreover, Literature which has been served until then as a covering to prove the assumptions of historians to interpret the flow of history became the main focus of historical studies. Following a critical approach, this paper seeks to answer these questions: first, what are the theoretical origins of systemic formalism? Secondly, what are its possibilities & limitations in compiling a history of literature?. © 2022, Faculty of Foreign Languages, University of Tehran. All rights reserved.
Publication Date: 2014
Journal of Vibroengineering (13928716)16(6)pp. 2779-2789
In this paper, the dynamic stability analysis of a simply supported beam excited by a sequence of moving masses is investigated. All components of the mass acceleration including the centripetal, the Coriolis and the vertical one are considered. The periodical traverse of masses across the beam results to a linear time-periodic problem. The Floquet theory and the Incremental Harmonic Balance (IHB) method are implemented to obtain the boundary between stable and unstable regions in the parameters plane. A new approach for identifying the conditions of resonance is investigated by presenting an intuitive definition of resonance for time-varying systems. This approach enables the IHB method to determine inherent curves of resonance conditions besides its ability to find the boundary curve separating the stable and unstable regions. Numerical simulations confirm the correctness of resulted curves. © JVE INTERNATIONAL LTD. JOURNAL OF VIBROENGINEERING 2014.
Publication Date: 2019
COMPARATIVE SOCIOLOGY (15691322)18(5-6)pp. 791-821
Efficiency and equality are both important goals and values in higher education, and their concurrency (balance) has been one of the main concerns of higher education scholars and policy makers over the past decades. The aim of the present study is to discover the causal mechanism and contextual factors that are likely to result in concurrency of equality and efficiency in higher education. To this end, the combination of two explanatory theories of equality and efficiency were used. The theory of equality focused on three dimensions of equal opportunities, modernization, and cultural differences. Likewise, to explain efficiency, Chalabi's three-level causal model of sustainable production of science was used. Methodologically, a multiple case study method was adopted, and the cases under study (nine countries) were selected based on purposive sampling. The findings showed that for the concurrency of equality and efficiency in higher education, a set of conditions must be present in the configurational and combinational causality. The preconditions for this concurrency is the presence of some social conditions such as productive economy, the rule of law, inter-societies competitiveness, social cohesion, democracy, universalism, egalitarianism (at macro level), meritocracy, academic autonomy, and organizational competitiveness (at the meso level) and the absence of some other conditions including fatalism (at the macro level).
Publication Date: 2022
Journal of Philosophical Investigations (22517960)16(39)pp. 453-465
At the beginning of the fourth book of metaphysics, Aristotle speaks of knowledge as "existing as existing and its inherent effects" and in other places he refers to this book as "the first philosophy" or "the first philosophy", "wisdom" and "theology". Which is later called metaphysics. As he has given different names to this science, he has also raised various topics for this science. The most fundamental subject in metaphysics of Aristotle is existence. In metaphysic, Aristotle has expressed the knowledge of existent in different ways and it is displayed various matter on this scale in a proper position. In the beginning of forth book of metaphysics, it is said that metaphysics is a knowledge of being as such, but metaphysics is a divine science in other parts so that its subject is an immovable and spiritual being. Also, it is a science to discuss the highest principle and elements and it is described as the knowledge of substance or primary substance too. So, the commentators of Aristotle encountered with some contradictions to identify the exact subject of metaphysics from the earlier of time. © The Author(s).
Publication Date: 2005
Journal Of Research In Medical Sciences (17357136)10(1)pp. 10-15
Background: Lateral osteotomy is a major part of rhinoplasty for remodeling external facet of the nose and narrowing of nasal base and dorsum after removal of the hump. There are two techniques for lateral osteotomy known as external and internal. Each of these provide advantages and impose limitations. The purpose of our study was to compare the severity of postoperative edema and ecchymosis between internal and external osteotomy techniques. Methods: This study was designed as a clinical trial on 30 cases. With randomization, one side of the nasal bone was selected for internal approach, and the other side, for external approach. Then, on the 1st and 7th days after surgery, the patients were scored for the severity of edema and ecchymosis. Results: On the first day after surgery, not only edema, but also ecchymosis was lower with the external osteotomy than with the internal approach (P = 0.037, P = 0.002, respectively). The severity of ecchymosis, on the 7th postoperative day, was lower with the external approach, and the difference was significant (P = 0.011). The severity of both edema and ecchymosis on the first postoperative day was evaluated higher in females, with statistically significant differences (P = 0.05 for edema and P = 0.003 for ecchymosis). The extension of ecchymosis on the 7th postoperative day was higher in women (P = 0.05). There were no significant differences between the two approaches in medialization of the involved bones and no apparent asymmetries either. Conclusion: According to the results of this study, external osteotomy seems to be the approach of choice, provided that the surgeon has enough experience in doing it.
Publication Date: 2020
Mechanics of Materials (01676636)145
This study addresses the dynamic stability of an Euler–Bernoulli nanobeam under time-dependent axial loading based on the nonlocal strain gradient theory (NSGT) and considering the surface stress effects. The studied nanobeam cross-section was rectangular, and simply-supported boundary conditions were assumed. Moreover, a uniform thermal gradient was applied to the nanobeam. The elastic medium was modeled based on the Pasternak theory. The strain–displacement relations were derived using the Von Kármán equations. The governing equations were obtained by the energy method and applying the Hamilton's principle. Furthermore, the Bolotin and Incremental Harmonic Balance (IHB) methods were used to solve the differential equations. This study investigates the impact of such parameters as the small-scale parameter, the material length scale, surface effects, elastic medium parameters, temperature variations, geometry, and the static loading factor on the Dynamic Instability Region (DIR). The results are suggestive of the shift of the DIR to lower frequency zone by increasing the small-scale Eringen's nonlocal theory parameter, whereas an increase in the material length scale from the strain gradient theory moves the region to higher frequencies. In case the said parameters are equal, the result conforms to the classical beam theory. In addition, assuming a Pasternak medium and taking into account the effects of surface stress (Young's modulus and the residual stress of the surface) shifts the DIR to higher frequencies, whereas applying a compressive static load moves the region to lower frequencies. Moreover, depending on the thermal expansion coefficient of the medium, temperature variations can also displace the DIR. © 2020 Elsevier Ltd
Publication Date: 2023
Jurnal Al-Tamaddun (18237517)18(2)pp. 105-116
Al-Hākim bi-Amr Allāh (reign 996–1021), the sixth Fatimid caliph in North Africa, is one of the most controversial characters in the history of Islam, who has engendered different and sometimes conflicting views of historians. Adopting a descriptive–analytical method, the present study aimed to assess the views of Heinz Halm, the contemporary Ismaili era researcher, on al-Hākim. Although al-Hākim has gone down the history as a brutal, wicked-minded man, Halm in The Fatimids and Their Traditions of Learning (1997) refers to al-Hākim as a highly-respected person among Egyptians, as a person who had a stable character with consistency in religious policies. Moreover, Halm depicts al-Hākim as totally opposed to the Druze who emerged, as a religious sect, with a belief in al-Hākim’s divinity. 1 The results of the study showed that Halm, drawing eclectically on historical sources, reports, and statements to depict al-Hākim’s character as justified and sound, had foregrounded, marginalized, and eliminated historical data about al-Hākim. © 2023, Academy of Islamic Studies, Dept of Islamic History and Civilization, University of Malaya. All rights reserved.
Publication Date: 2024
Artificial Intelligence and Law (09248463)32(2)pp. 325-367
We combine linear temporal logic (with both past and future modalities) with a deontic version of justification logic to provide a framework for reasoning about time and epistemic and normative reasons. In addition to temporal modalities, the resulting logic contains two kinds of justification assertions: epistemic justification assertions and deontic justification assertions. The former presents justification for the agent’s knowledge and the latter gives reasons for why a proposition is obligatory. We present two kinds of semantics for the logic: one based on Fitting models and the other based on neighborhood models. The use of neighborhood semantics enables us to define the dual of deontic justification assertions properly, which corresponds to a notion of permission in deontic logic. We then establish the soundness and completeness of an axiom system of the logic with respect to these semantics. Further, we formalize the Protagoras versus Euathlus paradox in this logic and present a precise analysis of the paradox, and also briefly discuss Leibniz’s solution. © The Author(s), under exclusive licence to Springer Nature B.V. 2023.
Publication Date: 2026
Energy Conversion and Management (0196-8904)348
This paper proposes a comprehensive framework for cyber-resilient optimal energy management system (EMS) in smart grids. A complete 24-hour closed-loop operational cycle is modeled and simulated. It begins with data measurement via a real-time updated nonlinear Digital Twin, followed by transmission through SCADA/RTUs, detection of cyberattacks, accurate reconstruction of corrupted data, and finally EMS. The outputs of EMS are then sent back to the Digital Twin, which is dynamically updated to reflect the actual network conditions and generate accurate synthetic measurements for the next hour. This entire process is embedded within a 24-hour rolling optimization scheme. The EMS includes a power flow model integrated with various distributed energy resources (DERs), such as renewables, diesel generator, battery, electric vehicle, and controllable loads. It also incorporates and ensures all technical, security, and dynamic constraints of the grid and DERs. Unlike previous studies that focus only on isolated aspects such as attack detection, data estimation, or day-ahead energy management, this work implements the entire process in a unified and dynamic framework. The model functions effectively in networks where PMUs are unavailable, as is the case in most real-world distribution grids, because it is designed solely based on RTU and SCADA data. Detection and reconstruction of coordinated attacks rely on physics-based recalculation methods, utilizing grid topology and data from neighboring buses to improve accuracy. The proposed model is validated on the IEEE 33-bus test system, successfully detecting various attack scenarios targeting different parameters, locations, and times. It reconstructs the correct values with high precision and optimizes the network operation accordingly. This 24-hour rolling simulation demonstrates the practicality and robustness of the approach in enabling secure, cost-effective, and resilient energy management in modern smart grids. © 2025 Elsevier Ltd.
Publication Date: 2025
Arts and Health (17533023)
Background: Complementary and alternative therapies (CAT), including artistic pursuits, have the potential to significantly aid in the management of symptoms and the enhancement of quality of life for patients diagnosed with multiple sclerosis (MS). This research study investigates the long-term effects of art classes on women in a natural environment, with a focus on how art influences their perception of the disease and their ability to cope with its symptoms. Methods: A narrative inquiry was conducted, encompassing in-depth interviews with 17 women hailing from a charitable treatment center located in Iran. Results: The findings of the study demonstrate that participation in art classes has a substantial impact on the emotional resilience, psychological well-being, and physical symptoms of the participants. The study underscores the clinical efficacy of art in enhancing quality of life and its supportive role in physical rehabilitation. Conclusion: This research demonstrates the potential of incorporating art into treatment programmes for women with MS. The findings support the integration of art as a complementary therapy to promote physical and psychological well-being. © 2025 Informa UK Limited, trading as Taylor & Francis Group.
Hemmati, R.,
Hemmati, R.,
Ahmadi jirdehi, M.,
Hemmati, R.,
Abbasi, V.,
Saboori, H. Publication Date: 2016
Frontiers of Information Technology and Electronic Engineering (20959230)17(11)pp. 1218-1227
We propose a new and efficient algorithm to detect, identify, and correct measurement errors and branch parameter errors of power systems. A dynamic state estimation algorithm is used based on the Kalman filter theory. The proposed algorithm also successfully detects and identifies sudden load changes in power systems. The method uses three normalized vectors to process errors at each sampling time: normalized measurement residual, normalized Lagrange multiplier, and normalized innovation vector. An IEEE 14-bus test system was used to verify and demonstrate the effectiveness of the proposed method. Numerical results are presented and discussed to show the accuracy of the method. © 2016, Journal of Zhejiang University Science Editorial Office and Springer-Verlag Berlin Heidelberg.
Publication Date: 2024
Journal of Cleaner Production (0959-6526)471
The rising occurrences of natural disasters, terrorist actions, and cyber-attacks that result in extensive, long-lasting, and expensive disruptions have necessitated a shift in focus towards the resilience of electrical grids for network operators. However, the task of designing a resilient network remains complex and costly. One potential solution to bolster resilience is the deployment of battery energy storage devices on the consumer side, known as distributed energy systems (DES). Despite its effectiveness, the high construction costs and lengthy payback period associated with investing in energy storage devices have led consumers to exhibit reluctance in adopting them. Cloud energy storage (CES) is an innovative and cost-effective solution to address those challenges. In the CES platform, investors install storage facilities in the network which can be rented by consumers to fulfill their needs and they become holders of the virtual batteries. By adopting this approach, consumers are relieved from the burden of maintenance, repair, and installation. While a single CES facility offers reduced costs and increased comfort for consumers, it compromises the resilience of the grid when compared to the Distributed Energy Storage (DES) mechanism. In order to bridge this gap, this paper proposes a dual CES model which serves as an intermediate solution between DES and single CES. The dual CES model strikes a balance between the resilience of the grid and cost-effectiveness. It provides a higher level of resilience compared to a single CES and a lower level compared to DES. Additionally, the costs associated with the dual CES model fall between that of a single CES and DES. This model not only increases the profit margin for investors but also enhances the overall comfort and well-being of consumers compared to the single CES. To validate the proposed model, a Mixed Integer Linear Programming (MILP) problem is formulated and simulated on the IEEE 33 bus network. Three cases are considered: DES, single CES, and dual CES. The results indicate that the dual CES reduces consumers' costs by 28 %, losses by 27 %, unsupplied load costs by 45 %, and return on investment by 33 %. Moreover, it increases the stability margin time by 2 intervals and improves robustness by 47 %. © 2024 Elsevier Ltd
Esfe, M.H.,
Esmaily, R.,
Khabaz, M.K.,
Alizadeh, A.,
Pirmoradian, M.,
Rahmanian, A.,
Toghraie, D. Publication Date: 2023
Tribology International (0301679X)178
In this study, a unique incorporated version is presented to enhance the dynamic viscosity of MWCNT- Al2O3 (40:60)/Oil 5W50 hybrid nanofluid (HNF) the usage of the 3 maximum vast and vital powerful parameters corresponding to temperatures, solid volume fractions (SVFs) and shear rates (SRs). An empirical relationship between energy consumption and these characteristics is presented. Thus, ANNs are used to develop a high-level data analysis model to predict the dynamic viscosity of MWCNT-Al2O3 (40:60)/Oil 5W50 HNF. A sensitivity analysis is employed to assess the importance of various parameters of MWCNT- Al2O3 (40:60)/Oil 5W50 HNF dynamic viscosity and the position of temperature, SVF and SR in simulation. It is found that the highest dynamic viscosity values are observed at temperatures below 5 °C. In addition, the dynamic viscosity is reduced by SR changes from 0 rpm to 800 rpm. Statistical analysis shows that the model performance is nearly equal, ranging between 0.98, 0.978, and 0.925, and that the errors are less than 2.6 % for the training, testing, and validation phases, respectively. Overall, it could be determined that the ANN simulation can generate the connection between the measured dynamic viscosity and anticipated dynamic viscosity of HNF. © 2022 Elsevier Ltd
Publication Date: 2022
International Journal of Energy Research (1099114X)46(9)pp. 11925-11942
This paper presents a new concept for district energy (DE) systems using central battery storage and decentralized hybrid renewable systems. The proposed DE consists of five buildings integrated with centralized 300 (V), 6.5 (A.h) batteries, locally distributed generations such as 8.5 (kW) wind turbines and 10 (kW) solar cells rated at 110 (V) and three-phase loads. The central battery can be connected to each home for exchanging power. To increase the resilience, the proposed control system connects home 1 to the external 380 (V) and 50 (Hz) network when the battery is operating above the limited power (ie, 50 [kW] for this case study). The connection to the external grid is done by assessing and confirming a set of necessary conditions. The proposed integrated control system for DE is designed to achieve the following objectives: maximum power extraction from local wind/solar units by maximum power point tracking, optimal charge-discharge process for central battery, connecting DE to the upstream network under outages and supplying the loads under all operating conditions. These goals are investigated by implementing six different scenarios of performance. In scenario 1, wind and solar units produce 6.6 (kW) and 24 (kW), respectively. Therefore, to feed the total load of 42.5 (kW), the central battery produces 15 (kW). In scenario 2, the total load in the first step is 35 (kW) and it is 95 (kW) in the second step. The power of solar and wind units in both loading steps is constant. The battery power increases from 6.5 (kW) absorption in the first step to 22 (kW) injections in the second step. In scenario 3, the solar units are switched off and in scenario 4, both solar and wind units are switched off. In such conditions, the battery responds to supply loads of homes. Increasing the energy resilience of DE during grid outages is modeled in scenario 5; where the battery power increases from 21 to 51.7 (kW) to deal with such outages. The nonlinear simulations in MATLAB/SIMULINK software show that the developed control strategy is able to control local renewable energies as well as the central battery while increasing the resilience and harvesting maximum power from decentralized wind/solar units. © 2022 John Wiley & Sons Ltd.
This chapter provides a sketch for thinking about forms of action and influence among Indigenous collectives in Lowland South America. 1 We show the pertinence of understanding relationships and actions as involving two interrelated characteristics: 1) the separation between a person who causes an act and the agent who executes it, and 2) persons always being the object of another’s regard. Our analysis is inspired by a variety of Amazonian ethnographies, as well as Marylin Strathern’s (1988) extensive analysis of personhood in Melanesia. This discussion of what we call a “politics of regard” returns and remains within the spirit of Pierre Clastres’s (1974) political anthropology of Lowland South America, but offers an ethnographically nuanced alternative to his opposition between coercive and non-coercive power. We also raise the questions of whether a “politics of regard” would provide a better comprehension of agency than its restriction to the operation of the master-pet relational schema allows for. 2. © 2025 selection and editorial matter, José Antonio Kelly and Marcos de Almeida Matos.
Hashemi, S.M.,
Heidarpour, M.,
Eshaghian, A.,
Ansari, P.,
Hashemi, M.S.,
Yaghoobi, M.,
Barati, S. Publication Date: 2015
Iranian Journal Of Otorhinolaryngology (22517251)27(5)pp. 395-399
Introduction: Aneurysmal Bone cysts (ABC) are extremely rare in the head and neck region and even rarer in sinuses. ABC is a benign multicystic mass that is locally-destructive and rapidly expandable. Hemorrhagic fluid content (like in this case) and septated appearance are the characteristic feature of ABC. Established treatment options for ABCs include sclerotherapy, embolization, radiotherapy, simple curettage, surgical excision, or a combination of methods. Case Report: In this article, a 5 year-old boy with a recurrent nasal mass is presented. The patient was finally diagnosed with this rare entity: ABC of the paranasal sinuses. The patient was treated through complete surgical removal. Conclusion: ABC can be considered as a rare differential diagnosis of recurrent nasal hemorrhagic mass in a pediatric population. © 2015 Mashhad University of Medical Sciences. All rights reserved.
Publication Date: 2022
Journal of Philosophical Investigations (22517960)16(40)pp. 597-612
This article returns to the longstanding problem of the soul/body relation. However, highlighting Orphism's impact on Plato, instead of arguing for a new account of this relation, the current study tries to trace back the problem to Orphism. Reading Plato’s work, while keeping in mind the Orphic rituals and beliefs concerned with immortality, would shed new light on the rise of the notion of the soul. Accordingly, some Orphean teachings and mythological origins will be reviewed. Then it will be focused on some of Plato's dialogues, which had a profound effect on later soul studies, to demonstrate how they are formulated based on Orphean themes. © The Author(s).
Publication Date: 2025
Energy (0360-5442)318
In recent years, reinforcing the electric power system against natural disasters has emerged as a critical challenge and concern. Natural disasters, events, and cyber-attacks pose significant challenges to distribution networks, leading to widespread outages and blackouts. One effective approach to addressing such challenges is to implement a microgrid formation strategy in conjunction with mobile or stationary distributed energy resources. This paper addresses a significant research gap by analyzing load restoration during outages as a part of network resilience strategy, through two simultaneous approaches: (i) microgrid formation and graph theory, and (ii) mobile charging station with battery swapping technology. The proposed microgrid formation utilizes tie-line breaker switches (BS) and a mobile battery-swapping van (MBSV) in a coordinated manner to enhance resilience of system. The IEEE 33-bus network serves as a case study, incorporating both active and reactive powers into the nonlinear power flow equations. Mixed integer linear programming (MILP) is employed, effectively linearizing nonlinear equations for efficient computation. The results show that within 24 h, the objective function value (total power of restored loads) is approximately 687,421 kW, and load restoration is achieved at a rate of 76 %. According to the comparative study, the network without formation suffers from voltage collapse while the proposed plan properly deals with voltage fluctuations and fixes the voltage magnitude within bounds. Additionally, the present research shows load restoration rates that are 5.8 % higher compared to the formed network without a battery swapping station, and 2.3 % higher compared to the formed network with a fixed battery swapping station. During the outages, the MBSV is dispatched to the affected area to maximize the total power of restored loads, primarily due to the high priority of loads in this region. Simulations of network performance under long-term failure is conducted with limited and unlimited fuel. In both cases, batteries discharge after 8 h. With limited fuel, the network performance drops to 55 %, while with unlimited fuel, it drops to 40 %. © 2025 Elsevier Ltd
Hemmati, R.,
Hemmati, R.,
Boroujeni, S.M.S.,
Delafkar, H.,
Behzadipour, E.,
Boroujeni, A.S.,
Hemmati, R. Publication Date: 2011
Australian Journal of Basic and Applied Sciences (19918178)5(7)pp. 652-659
Power System Stabilizers (PSS) are used to generate supplementary damping control signals for the excitation system in order to damp the Low Frequency Oscillations (LFO) of the electric power system. The PSS is usually designed based on classical control approaches but this Conventional PSS (CPSS) has some problems. To overcome the drawbacks of CPSS, numerous techniques have been proposed in literatures. In this paper a PID type PSS is considered for damping electric power system oscillations. The parameters of this PID type PSS are tuned based on Simulated Annealing (SA) optimization method. The proposed PSS (SA-PSS) is evaluated against the conventional power system stabilizer (CPSS) at a single machine infinite bus power system considering system parametric uncertainties. The simulation results clearly indicate the effectiveness and validity of the proposed method.
Publication Date: 2018
Journal of the History of Philosophy (00225053)28(21)
At the beginning of the establishment of the Islamic government, the Messenger of God (SAWS) started to take purposeful measures in order to strengthen his newborn governance. One of his outstanding measures was to codify a general treaty among all the people of Medina including the Jews, which allowed for peaceful coexistence in the town. Among the Jewish tribes inhabiting Medina, Banu Qaynaqa' signed the treaty with the Messenger of God. However, for some reasons to be discussed in the article, later on they took the pathway of hostility and enmity to Islam and the Prophet. Having become unable to oppose the Prophet and Muslims, eventually they surrendered and were banished from Medina in accordance with the divine decision. The opposition between Banu Qaynaqa' and the Messenger of God is among the cases addressed by Quran. The present article aims to answer the question what is the Quran's attitudinal and authorship approach to the opposition. In view of the philosophy of the revelation of Quran, i.e. the guidance of the humankind, it seems that the Qur'anic historical working-through of historical events including Ghazwa Banu Qaynaqa' is unique from both attitudinal and authorship perspectives and directed at the objective of guidance, which distinguishes Quran from historical sources. © 2018 Johns Hopkins University Press. All rights reserved.
Publication Date: 2016
Language Related Research (23223081)7pp. 195-216
Hafez poems have complex and depth aspects. According to this feature everyone analysis the semantic structure of his poems differently. Structural study of Hafez narrative lyrics shows that not only different verses of lyric are not separate and disconnected but appear in a continuous and dynamic chain. Semantic integration of these lyrics and narrative structure of it provide the strong basis for semiotic study. For a better understanding of internal relations of narrative lyrics and its continuity and discontinuity, it is necessary to pay attention to the structure of narrative. The most widely used type of discourse in these poems is cognitive discourse, however sometimes the interaction between cognitive and emotional discourse is established in lyrics. In this way, Hafez destroys the common cognitions and suggest new and uncommon cognitions that are apparently against Islamic law and thereby criticizes the hypocrites of time and invites them to passion and drunkenness. In narrative lyrics, Cognition is associated with discourse discontinuity. The discourse of these lyric supports the integration of verses is established until the end of poem. So in this article we will survey the structure of Hafez Narrative lyrics and discourse discontinuity and continuity. © 2016, Tarbiat Modares University. All rights reserved.
Moafi, A.,
Rahgozar, S.,
Ghias, M.,
Ahar, E.V.,
Borumand, A.,
Sabbaghi, A.,
Sameti, A.,
Hashemi, S.M. Publication Date: 2011
International Journal Of Preventive Medicine (20088213)2(4)pp. 280-285
Objectives: Obesity and increased blood pressure are identified as risk factors for cardiac and pulmonary disorders. On the other hand, iron deficiency (another preventable disease) is common in adolescence and considered as associated with health impairment. The present study evaluates body mass index (BMI) and its association with blood pressure and hematological indices in freshman students entering the University of Isfahan in 2009. Methods: All the 1675 students who entered the University of Isfahan in September 2009 were examined. Height, weight, BMI, blood pressure, hemoglobin (Hb) and red blood cell (RBC) indices of these students were measured. The prevalence of high blood pressure, its association with BMI and the relation between BMI and anemia, iron deficiency and educational achievement were assessed. Results: All participants, including 514 males and 1161 females, went under clinical observations. The average age was 20.7 ± 3.8. year Among the students, 18.2% of males and 20% of females were underweight. High systolic blood pressure was more common in the students with BMI > 25 kg/m2 (p < 0.001). Anemia was seen in 8.7% of females. In males, however, a relation between anemia frequency and BMI < 18.5 kg/m2 was more distinct (p = 0.002). There was no association between anemia and students' average test scores. Conclusions: High incidence of abnormal BMI in the study population, and its association with systolic blood pressure indicate the importance of nutritional guidelines and counseling programs for freshman students. On the other hand, high incidence of anemia in this population ascertains the necessity of anemia screening programs before academic studies.
Taghian, E.,
Abtahi, S.H.,
Mohammadi, A.,
Hashemi, S.M.,
Ahmadikia, K.,
Dolatabadi, S.,
Mohammadi, R. Publication Date: 2023
Journal Of Research In Medical Sciences (17357136)28(1)pp. 12-12
Background: In natural conditions, inhaled fungi are considered a part of the microflora of nasal cavities and sinuses. However, subsequent to the protracted use of corticosteroids and antibacterial agents, suppression of the immune system by chemotherapy, and poor ventilation, these fungi can become pathogens. Fungal colonization in the nose and paranasal sinuses is a prevalent medical issue in immunocompetent and immunosuppressed patients. In this study, we aimed to categorize fungal rhinosinusitis (FRS) among immunocompetent and immunosuppressed patients and identified the etiologic agents of disease by molecular methods. Materials and Methods: A total of 74 cases were evaluated for FRS. Functional endoscopic sinus surgery was performed for sampling. The clinical samples were examined by direct microscopy with potassium hydroxide 20% and subcultured on Sabouraud Dextrose Agar with chloramphenicol. Polymerase chain reaction sequencing was applied to identify causative agents. Results: Thirty-three patients (44.6%) had FRS. Principal predisposing factors were antibiotic consumption (n = 31, 93.9%), corticosteroid therapy (n = 22, 66.6%), and diabetes mellitus (n = 21, 63.6%). Eyesore (n = 22, 66.6%), proptosis (n = 16, 48.5%), and headache (n = 15, 45.4%) were the most common clinical manifestations among patients. Rhizopus oryzae (n = 15, 45.4%) and Aspergillus flavus (n = 10, 30.3%) were the most prevalent fungal species. Conclusion: Diagnosis and classification of FRS are crucial, and a lack of early precise diagnosis can lead to a delay in any surgical or medical management. Since there are a variety of treatments for FRS, accurate identification of etiologic agents should be performed based on phenotypic and molecular methods. © 2023 Journal of Research in Medical Sciences.
Publication Date: 2020
Journal of Physical Chemistry A (15205215)124(45)pp. 9436-9450
Chiral discrimination, the ability of a chiral molecule to exhibit different weak intermolecular interactions than its mirror image, is investigated for dimers of oxiranemethanol (glycidol). In this regard, high-level ab initio calculations were performed to study the chiral recognition effects in the homochiral and heterochiral dimers of glycidol. Fourteen dimer structures, seven homochiral and seven heterochiral, were studied: they all feature two intermolecular O-H···O hydrogen bonds. These structures have been determined with the second-order Møller-Plesset perturbation theory (MP2) using the aug-cc-pVTZ basis set and verified to pertain to actual local minima. The benchmark interaction energy values were computed using MP2 extrapolated from the aug-cc-pVQZ and aug-cc-pV5Z bases with a higher-level correction from a coupled-cluster calculation in the aug-cc-pVTZ basis. The global minimum structure is a homochiral one, with the two hydrogen bonds forming a part of a ring with eight heavy atoms. A similar heterochiral structure has a binding energy smaller by about 0.6 kcal/mol. The largest diastereomeric energy difference is about 1.0 kcal/mol. Further insight into the origins of chiral discrimination was provided by symmetry-adapted perturbation theory (SAPT) and a functional-group SAPT (F-SAPT) difference analysis to investigate the direct and indirect effects of two -H/-CH2OH substitutions leading from an achiral ethylene oxide dimer to the chiral glycidol dimer. Last but not least, harmonic frequency shifts relative to a noninteracting glycidol molecule were calculated and analyzed for all conformations to get insight into the origins of chiral discrimination. It is found that the largest frequency shifts are related to the effect of hydrogen bonding on the O-H stretch mode, the stability of the ring involving both hydrogen bonds, and the transition between two nonequivalent minima of the glycidol molecule. © 2020 American Chemical Society.
Publication Date: 2022
Energy (0360-5442)252
This paper presents a control scheme including resources and load management in the residential DC microgrid. The DC microgrid is supported by fuel-cell, solar-cell and battery. The DC, AC single-phase and AC three-phase loads with 50 Hz frequency are integrated. The DC microgrid is connected to the external 60 Hz AC three-phase network. An efficient multi-bus topology is proposed for the microgrid and it is formed by various AC/DC buses to supply the loads and managing the resources. The main bus of system is a 470 V DC bus and it is connected to the external 440 V/60 Hz AC grid. The main DC bus supplies three LV, MV and HV DC buses with 100, 220, and 110–380 V, respectively. The HV DC bus produces a variable output DC voltage between 110 and 380 V in order to regulate the load power (i.e., motor speed). The MV DC bus is connected to 220 V/50 Hz AC single-phase loads. The connections between DC microgrid with AC loads and AC external gird are made by single-phase or three-phase inverters. The interface inverters between DC bus and AC loads are operated to control power, torque, speed, frequency and voltage of loads. The unbalanced AC loads are appropriately balanced by proper control of interface inverters. The resources and inverters are efficiently controlled to enable operation of residential building under both off-grid or grid-tied conditions. The coordination of fuel-cell, solar-cell and battery can supply a fixed 8 kW power to external grid and supply the internal loads under all outages and off-grid conditions. The simulations demonstrate that the proposed control realizes all the objectives including AC/DC load management, unbalanced load amendment, frequency adaptation, and off-grid operation. © 2022 Elsevier Ltd
Publication Date: 2021
Thin-Walled Structures (02638231)169
In this study, using modified strain gradient theory (MSGT) and the first-order shear deformation assumption (FSDA) framework, wave propagation through air-filled double-walled functionally graded (FG) cylindrical microshells subjected to linear and non-linear thermal loadings are investigated. MSGT has the advantage of having up to three scale parameters and can successfully reproduce size effects. The power-law model is used to express the distribution of material characteristics over the thickness of each shell due to characteristics varying by temperature, and the application of Hamilton's principle results in deducing vibroacoustic equations in coupled relations. The size-dependent coupled vibroacoustic governing equations are solved using an analytical approach in conjunction with a double Fourier series, with the final result providing the appropriate Sound Transmission Loss (STL) equation. The developed solution's accuracy and precision are examined by comparing it to data available from previous studies. Parameter studies reveal the impacts of temperature distribution, functionally graded index, incident angles, acoustic cavity depth, and length scale parameter on STL through double-walled FG cylindrical microshells. © 2021
