Seismic risk mitigation of historical masonry towers by means of prestressing devices

This work presents the investigation of the efficiency of different prestressing devices as a rehabilitation measure for the seismic risk mitigation of historical masonry towers. As a first phase, the seismic vulnerability of theoretical masonry towers was assessed by means of numerical models validated with information from the literature, observed damage and behavior of these structures due to passed earthquakes (crack pattern and failure mechanisms), and mainly taking into account the engineering experience. Afterwards, the validated models were rehabilitated with different prestressing devices; analyzing the results and concluding which device or the combination of them improved in a better way the seismic performance of the masonry towers. Finally, the methodology will be applied in two historical masonry towers located in seismic areas; the medieval tower “Torre Grossa” of San Gimignano, Italy, and one of the bell towers of the Cathedral of Colima, Mexico.Technical University of BraunschweigUniversity of Florenc

Modeling the impact of climate change and land use change scenarios on soil erosion at the Minab Dam Watershed

Climate and land use change can influence susceptibility to erosion and consequently land degradation. The aim of this study was to investigate in the baseline and a future period, the land use and climate change effects on soil erosion at an important dam watershed occupying a strategic position on the narrow Strait of Hormuz. The future climate change at the study area was inferred using statistical downscaling and validated by the Canadian earth system model (CanESM2). The future land use change was also simulated using the Markov chain and artificial neural network, and the Revised Universal Soil Loss Equation was adopted to estimate soil loss under climate and land use change scenarios. Results show that rainfall erosivity (R factor) will increase under all Representative Concentration Pathway (RCP) scenarios. The highest amount of R was 40.6 MJ mm ha(-1) h(-1)y(-1) in 2030 under RPC 2.6. Future land use/land cover showed rangelands turning into agricultural lands, vegetation cover degradation and an increased soil cover among others. The change of C and R factors represented most of the increase of soil erosion and sediment production in the study area during the future period. The highest erosion during the future period was predicted to reach 14.5 t ha(-1) y(-1), which will generate 5.52 t ha(-1) y(-1) sediment. The difference between estimated and observed sediment was 1.42 t ha(-1) year(-1) at the baseline period. Among the soil erosion factors, soil cover (C factor) is the one that watershed managers could influence most in order to reduce soil loss and alleviate the negative effects of climate change.FCT-Foundation for Science and Technology - PTDC/GES-URB/31928/2017; FEDER ALG-01-0247-FEDER-037303info:eu-repo/semantics/publishedVersio

The Concept of Educational Achievement and its Effective Factors according to the Overseas Graduates’ Point of View: a Qualitative Study

Background & Objective : The importance of dispatching students to foreign countries to continue education is so obvious that even developed countries are not needless of that. Hence, this study was conducted to evaluate the opinion of overseas graduates, who were on a scholarship, about the meaning and concepts of educational achievement and its effective factors. Methods : In this qualitative study, 11 faculty members of Kerman University of Medical Sciences who have been graduated from foreign universities participated. They were inquired into their opinions about assessment criteria of educational achievement and its effective factors using an open interview. Results : Among the most important concepts of educational achievement regarding education quantity, attending seminars and conferences can be pointed out. The efficiency of learned materials and learning professional scientific topics are important considering education quality and learning extra topics, respectively. The interviewees also believed that personal factors including personality, family, economic affairs, having professional knowledge in the field of study, necessary skills in the language of the target university and its status especially tutors, topic and field of research were also substantial. Conclusion : Our findings suggest that concepts of academic achievement are vast and one cannot be considered successful assessing only one or some criteria. Hence, duration of study, the amount of scientific products and their quality, the amount of scientific connections and the application of learned topics by the learner are to be noted. Keywords: Educational achievement, Overseas student, Medical sciences, Overseas graduate

Bibliometric and Content Analysis of Scientific Outputs Relevant to Health Education and Promotion in Iran during 1998-2011

Background: Since the aim of health research is to improve the quality of community life, the results obtained from these research could be used in health policies and practices. Therefore, the aim of this study was to evaluate the bibliometric and content analysis of research relevant to health education and promotion performed in Iran during 1998-2011. Methods: This is a descriptive content analysis study. Data were collected from online databases (IranMedex, Medlib, SID, ISI, and PubMed), and all published articles relevant to health education and promotion in Iran up to the end of March 2011 were included in this study. In order to do content analysis a researcher-made checklist approved by experts was used for identifying the variables. Data was entered into SPSS 21 and descriptive statistics and percents were calculated. Results: From 1227 documents retrieved, 817 were published in Persian and 410 in English. A great share of retrieved documents belonged to the articles published in the scientific journals (87.4%). Mental health (10.7%), family planning and reproductive health (10.2 %), and chronic non-communicable diseases (10.2%) were the most frequent subject areas in research relevant to health promotion, respectively. Most of the studies were cross-sectional (52.1%), the most widely used method was simple random sampling (27.7%), and most of the studies were performed locally in provinces (83.7%). Conclusion: Doing more studies by outlining the exact perspective of health promotion research in Iran and comparison of the current status of Iran with that of other countries are recommended

A Novel Experience in Treatment of Liver Hydatidosis in Pediatrics: A Clinical Trial Study

Background Hydatidosis is a conventional health public problem in most parts of the world. Safe treatment of patients with hydatidosis has been a topic of debate for a long time. Surgical treatment always was associated with high morbidity and mortality. Medical treatment is also controversial. In this study, alternative procedure named Percutaneous, Aspiration and hypertonic Saline Instillation (PAHSI) was applied to treat patients with hydatidosis. Materials and Methods In this single-blind clinical trial, thirty-eight patients, ranging in age between 6 months and 16 years, with 81 hepatic hydatid cysts underwent PAHSI treatment. The consecutive steps including sonographic guidance, aspiration of cyst content and injection of 15% saline hypertonic were carried out in this method. Patients with multiple cysts also were treated by this procedure. Results Participants were 18 boys (47.3%) and 20 girls (52.6%) with mean age of 8.08+ 3.92 years. Almost half of the patients had single cyst (52.63%). During 2- year follow- up, no recurrences were observed; therefore, re-hospitalization and possible complications reduced considerably. Furthermore, this method was applicable to cure multiple cysts. Conclusion In PAHSI strategy, it seems that the complications of surgery (laparotomy and anesthesia) decreased since no complications observed after procedure, and cosmetic results in future are much better due to avoidance of incision

Avaliação de suscetibilidade de erosão gully na bacia hidrográfica de Kondoran usando algoritmos de aprendizagem de máquina e a seleção de recursos boruta

Gully erosion susceptibility mapping is an essential land management tool to reduce soil erosion damages. This study investigates gully susceptibility based on multiple diagnostic analysis, support vector machine and random forest algorithms, and also a combination of these models, namely the ensemble model. Thus, a gully susceptibility map in the Kondoran watershed of Iran was generated by applying these models on the occurrence and non-occurrence points (as the target variable) and several predictors (slope, aspect, elevation, topographic wetness index, drainage density, plan curvature, distance to streams, lithology, soil texture and land use). The Boruta algorithm was used to select the most effective variables in modeling gully erosion susceptibility. The area under the receiver operating characteristic curve (AUC), the receiver operating characteristics, and true skill statistics (TSS) were used to assess the model performance. The results indicated that the ensemble model had the best performance (AUC = 0.982, TSS = 0.93) compared to the others. The most effective factors in gully erosion susceptibility mapping of the study region were topological, anthropogenic, and geological. The methodology and variables of this study can be used in other regions to control and mitigate the gully erosion phenomenon by applying biophilic and regenerative techniques at the locations of the most influential factors.PTDC/GES-URB/31928/2017info:eu-repo/semantics/publishedVersio