20 research outputs found
Incidence of intradialytic complications and their risk factors in patients undergoing hemodialysis in hospitals affiliated to Medical University of Hamadan Iran
No full textIncidence of intradialytic complications and their risk factors in patients undergoing hemodialysis in hospitals affiliated to Medical University of Hamadan Iran Ghahri Sarabi, AR.1 (MSN); Torabi, M.2 (MSN); Abed Saeedi, Zh.3 (PhD); Akbarzadeh Baghban, A.4 (PhD) 1. Lecture, Dept. of Medical Surgical, Faculty of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran. Iran.2. Alumnus, Faculty of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences. Tehran. Iran3. Assistant Professor, Dept. of Medical Surgical, Faculty of Nursing & Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran. 4. Assistant Professor, Dept. of Biostatistics. Faculty of Paramedical, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Abstract Background and aimHemodialysis is one the most common renal replacement therapies in end stage renal disease. Despite progress in dialysis technology, intradialytic complications occur frequently. The aim of this study was to determine the rate of intradialytic complications and their risk factors in patients undergoing hemodialysis in hospitals affiliated to Medical University of Hamedan Iran in 2009. Materials and methods192 patients undergoing hemodialysis participated in this descriptive correlational study. These patients were included in the study using census method. Data were collected by1- a questionnaire which consisted of 3 sections (demographic information, person – related factors and therapy- related factors),2-a check list and clinical examination ( blood pressure and weight measurement). Content validity of the questionnaire was assessed by 10 nursing experts, 5 staff of hemodialysis wards and 2 nephrologists. Reliability of check list was measured using inter-rater reliability (r=0.98). Data were collected by the second author. Data were analyzed by SPSS 15. Findings Findings showed that the most frequent complications include: hypotension (%15.1), muscle cramp(%11.5), nausea(%9.4), headache(%7.8), angina(%2.6), vomiting (%2.1) and itching(%1.6) respectively. Logistic regression analysis, showed a significant correlation between age and cramp (person – related causes) and a significant correlation between hypotension, cramp with vomiting and headache. Moreover, findings showed a significant correlation between nausea with eating during dialysis (patient- related causes); and between hypotension with dialysis solution (therapy- related causes). ConclusionBased on the results of this study, most of intradialytic complications can be prevented. Use of these findings can improve the process of dialysis. Keywords: Hemodialysis, Intradialytic hemodialysis complications *Corresponding Author: Alireza Ghahri Sarabi, department of Medical-Surgical nursing, school of nursing and midwifery, Shahid beheshti University of Medical Sciences and Health Services, Tehran, Iran. E-mail: [email protected]
Third Place: Folding and Unfolding Third Place in a High-rise Typology
No full textArchitecture, Urbanism and Building Sciences | Advanced Housing Desig
Travelling microwave reactor design
No full textIn this work, the doctoral thesis of G.S.J. Sturm on microwave reactors was continued. Microwave reactors are developed, because they have potential to increase safety and economically reduce waste. This work focused on microwaves and chemical processes, instead of just heating water, by designing a travelling microwave reactor for non-oxidative methane dehydroaromatization.The travelling microwave reactor was designed using a structured approach. First, the objective was set to an economical conversion to aromatics of otherwise flared methane. Therefore, a successfully designed reactor is able to reduce the CO2 emissions and make many other reactions economical. Secondly, twenty-one challenges for microwave reactors were found using check-lists and a self-developed phenomena exploration method. This method was used to find unknown challenges on the intersection of established engineering fields. Then sub-solutions solving these challenges were extracted from existing reactors and reactor concepts. Finally, a few sub-solutions were selected and forced to work together to obtain the designed reactor.The designed reactor consists of a high performance coated asymmetric annular monolith in an inert container with narrowing conductors in axial direction and an anisotropic porous media. The achieved production volume is three orders of magnitude larger than of a mono-mode microwave reactor at same operation frequency. The designed reactor is capable of obtaining another five orders of magnitude by increasing the temperature up to 1500K, pressure up to 50 atm, catalyst activity with at least two orders of magnitude and lowering the operating frequency. However, only four orders of magnitude were reached, because the designed reactor hit a flow limit.The designed reactor with the three plus four order of magnitude improvement is not yet economical feasible. More advanced designs such as the spiralling narrowing rectangular microwave reactor might be. Furthermore, the designed reactor could become economically feasible in case of a more valuable product. Eventually, this work revealed some unsolved problems and opportunities of microwave reactors as well as information gaps. Moreover, it brought microwave reactors closer to industrial application.<br/
Takagi–Sugeno fuzzy payload estimation and adaptive control
No full textIn this paper, a novel adaptive Takagi-Sugeno (TS) fuzzy observer-based controller is proposed. The closed-loop stability and the boundedness of all the signals are proven by Lyapunov stability analysis. The proposed controller is applied to a flexible-transmission experimental setup. The performance for constant payload in the presence of noisy measurements is compared to a controller based on a classical extended Luenberger observer. Simulation and real-time results show that the proposed observer-based feedback controller provides accurate position tracking under constant and varying payloads.Support Delft Center for Systems and ControlLearning & Autonomous Contro
Figures of Excess: Subversive Narrative Strategies in Contemporary Iranian Women's Literature and Cinema
No full textThis study seeks “formal” and “thematic” excess in the works of contemporary Iranian novelists and filmmakers, including Shahrnush Parsipur, Moniru Ravanipur, Fariba Vafi, and Marzieh Meshkini. It strives to develop new critical perspectives on the literary contributions of these works in terms of female resistance through their employment of figures of excess. Exploring excessive woman-subjects, the first chapter of this study engages with Shahrnush Parsipur’s, novel, Women without Men and a number of her other novels, which provide fertile sites for extraordinary and defiant women, who subvert standards of womanhood in Iranian culture. Seeking excess, embodied in strange themes, the second chapter of this study investigates Moniru Ravanipur’s magical realist novel, The Drowned in conjunction with Parsipur’s science fiction novel, Shiva. It argues that excessive/strange themes enable each author to articulate her particular message: favoring fast-paced social and economic progress through highly advanced technologies in Shiva, and the preservation of long standing tradition in The Drowned.
The third chapter of this study engages with Fariba Vafi’s novels, My Bird and A Secret in the Alleys, in terms of excessive non-verbal and verbal acts, such as “internal monologue” and “verbosity.” It demonstrates that in both novels the protagonists’ active engagement with traumatic experiences, facilitated by memory and internal monologues, enables them to ultimately process trauma into language. The fourth chapter of this study examines the representations of women in Jafar Panahi’s film, The Circle (2000), and Marzieh Meshkini’s film debut, The Day I Became a Woman (2000). It argues that in both films excess not only manifests in “circular” narrative forms, but also in themes and images that evoke the motif of the circle. It argues that these themes speak to the perpetual sense of captivity and despair many women feel in the post-revolutionary Iranian society, for example, those belonging to the rural poor as in The Day, or, the urban poor and lower-middle classes as in The Circle
Reverse traveling microwave reactor – Modelling and design considerations
No full textMicrowave heating presents a potentially green alternative for energy supply to chemical and catalytic reactors as it can be based on the electricity from renewable sources. The Reverse Traveling Microwave Reactor (RTMR) is a novel heterogeneous catalytic reactor concept, based on the coaxial waveguide structure. The reactor has two microwave ports on both ends, and microwave irradiation is periodically switched between those ports to minimize the temperature gradients along the catalyst bed. In the current paper, COMSOL MULTIPHYSICS® simulation environment has been used to develop a 3D multiphysics model of the RTMR. Based on the model, operational characteristics of the reactor including electric field distribution and transient temperature profiles have been studied. Simulation results show that periodically reversed microwave irradiation improves the homogeneity of the temperature distribution inside the catalyst bed. The study provides new insights into the design and scale-up of microwave-assisted catalytic flow processes.</p
Microwave heating in heterogeneous catalysis: Modelling and design of rectangular traveling-wave microwave reactor
No full textMicrowave irradiation can intensify catalytic chemistry by selective and controlled microwave-catalytic packed-bed interaction. However, turning it to reality from laboratory to practical applications is hindered by challenges in the reactor design and scale-up. Here, we present a novel, rectangular traveling-wave microwave reactor (RTMR) and provide an easy-to-handle, 3-step design procedure of such reactor. The multiphysics model couples the electromagnetic field, heat transfer, and fluid dynamics in order to optimize the geometrical parameters and operational conditions for the microwave-assisted heterogeneous catalysis. The results show that the microwave energy input/output ports should be well-positioned and matched; otherwise, it would significantly decrease energy efficiency. In terms of microwave transmission, the RTMR presents a mix between the standing wave and the traveling-wave systems. Gas space velocity and input temperature significantly affect the temperature profile, and gas–solid temperature can present no significant difference under certain gas–solid contact.Intensified Reaction and Separation SystemsComplex Fluid Processin
Oliveria decumbens and Pistacia atlantica Gum's Essential Oils: Assessment of Antimicrobial and Chemical Properties During Thermal Process
No full textThe essential oils usually have a good effect against undesirable microorganisms; therefore, they can be utilized as natural antimicrobial agents in food or their packaging. In this research, the antimicrobial attributes of two essential oils (Oliveria decumbens and Pistacia atlantica gum), have been investigated before and after thermal process (200°C - 10 minutes) against bacterial and mold spoilage in bread. Also, the compounds of essential oils were detected by gas chromatography-mass spectrometry. The main compounds of the essential oil of O. decumbens were carvacrol, thymol, and elemicin before and after thermal treatment. In the case of P. atlantica gum, only one prominent peak was observed in the chromatogram, which was related to the α-pinene. For both essential oils, the MIC and MFC against Aspergillus niger were 4000 and 8000 μL/ml, respectively. In comparison, the antimicrobial effect of both essential oils against Bacillus subtilis was higher than the mold. The amount of MIC and MBC were 125 and 250 μL/ml for Oliveria decumbens and 62.5 and 125 μL/ml for Pistacia atlantica gum, respectively. The results showed that these two essential oils have a promising effect against the main microorganisms of bread spoilage. The thermal process did not significantly affect the antimicrobial activity of Pistacia atlantica gum essential oil against A. niger but significantly decreased the antimicrobial activity against B. subtilis, while in the case of antimicrobial activity of Oliveria decumbens essential oil, the results were the opposite. Considering the fact that the most spoilage agents of the bread are molds so the use of Pistacia atlantica gum essential oil is recommended as natural preservatives in products that tolerate high heat treatment, such as bread and bakery products
The Digital Dance of HRM: New Skills, Professional Debates, and Shifting Dynamics?
No full textThe increasing datafication and digitalization of organizational life are profoundly reshaping HRM as a professional field. This symposium explores how these technological transformations affect HRM practitioners' roles, expertise, and relationships with stakeholders. While data analytics presents opportunities for HRM to demonstrate business value, it also creates tensions with traditional aspects of HR work, particularly in areas requiring tacit people skills such as conflict management and cultural sensitivity. Through four complementary presentations, we examine these dynamics across various levels of social complexity. Our symposium combines multiple methodological approaches, including mixed-methods analysis of changing skill profiles, expert forecasting through a Delphi study, reviewing algorithmic HRM in frontline service work, and a conceptual paper including case studies of skill-based job matching systems. Together, these presentations reveal how HRM practitioners and professional communities negotiate technological change. The symposium contributes to broader discussions about the adaptation of managerial professions to data-driven technologies in contemporary organizations. Our findings suggest that while technological impact on HRM may be less dramatic than often portrayed, it nevertheless requires careful consideration of how to implement new tools while preserving decent working conditions and effective stakeholder relationships. From Gut Feelings to Data Dealings? The Transformation of HRM Expertise in the Age of Digitalization Author: Felix Diefenhardt; Vienna University of Economics and Business Author: Julius Ernst Lechner; Vienna University of Economics and Business Author: Marco Leander Rapp; University of Amsterdam Author: Verena Bader; The future role of HRM and leadership in the context of digital transformation ? A Delphi study Author: Liehr Jennifer; Author: Sven Hauff; Helmut Schmidt University - University of the Federal Armed Forces of Hamburg Author: Tobias Schloemer; Helmut Schmidt University - University of the Federal Armed Forces of Hamburg Author: Karen Schwien; Helmut Schmidt University - University of the Federal Armed Forces of Hamburg Algorithmic HRM in Service Work: A Multi-Stakeholder Perspective and Future Research Agenda Author: James Duggan; Author: Stefan Jooss; The University of Queensland Digitization for Innovative Future HRM: A Skill-Based Approach Author: Alessandro MARGHERITA; University of SalentoThe increasing datafication and digitalization of organizational life are profoundly reshaping HRM as a professional field. This symposium explores how these technological transformations affect HRM practitioners' roles, expertise, and relationships with stakeholders. While data analytics presents opportunities for HRM to demonstrate business value, it also creates tensions with traditional aspects of HR work, particularly in areas requiring tacit people skills such as conflict management and cultural sensitivity. Through four complementary presentations, we examine these dynamics across various levels of social complexity. Our symposium combines multiple methodological approaches, including mixed-methods analysis of changing skill profiles, expert forecasting through a Delphi study, reviewing algorithmic HRM in frontline service work, and a conceptual paper including case studies of skill-based job matching systems. Together, these presentations reveal how HRM practitioners and professional communities negotiate technological change. The symposium contributes to broader discussions about the adaptation of managerial professions to data-driven technologies in contemporary organizations. Our findings suggest that while technological impact on HRM may be less dramatic than often portrayed, it nevertheless requires careful consideration of how to implement new tools while preserving decent working conditions and effective stakeholder relationships. From Gut Feelings to Data Dealings? The Transformation of HRM Expertise in the Age of Digitalization Author: Felix Diefenhardt; Vienna University of Economics and Business Author: Julius Ernst Lechner; Vienna University of Economics and Business Author: Marco Leander Rapp; University of Amsterdam Author: Verena Bader; The future role of HRM and leadership in the context of digital transformation ? A Delphi study Author: Liehr Jennifer; Author: Sven Hauff; Helmut Schmidt University - University of the Federal Armed Forces of Hamburg Author: Tobias Schloemer; Helmut Schmidt University - University of the Federal Armed Forces of Hamburg Author: Karen Schwien; Helmut Schmidt University - University of the Federal Armed Forces of Hamburg Algorithmic HRM in Service Work: A Multi-Stakeholder Perspective and Future Research Agenda Author: James Duggan; Author: Stefan Jooss; The University of Queensland Digitization for Innovative Future HRM: A Skill-Based Approach Author: Alessandro MARGHERITA; University of Salent
