Testing and analysis of masonry arches subjected to impact loads

A prototype single span masonry arch was designed and its capacity was assessed both experimentally and numerically. The geometric design process was based on the dimensional-constraints of the laboratory. A quasi-static experimental test was conducted on the arch and the force deformation behaviour of the arch was obtained. Joint interface properties might play an important role in numerical assessment of masonry stone bridges; therefore the influence of these parameters is addressed. A sensitivity numerical analysis was carried out to figure out the range of values that gives similar global behaviour of the arch from both numerical and experimental simulations. Subsequently, the results of the impact test are given and a numerical simulation able to capture the main characteristics of the response is presented

Surgical robotics beyond enhanced dexterity instrumentation: a survey of machine learning techniques and their role in intelligent and autonomous surgical actions

PURPOSE: Advances in technology and computing play an increasingly important role in the evolution of modern surgical techniques and paradigms. This article reviews the current role of machine learning (ML) techniques in the context of surgery with a focus on surgical robotics (SR). Also, we provide a perspective on the future possibilities for enhancing the effectiveness of procedures by integrating ML in the operating room. METHODS: The review is focused on ML techniques directly applied to surgery, surgical robotics, surgical training and assessment. The widespread use of ML methods in diagnosis and medical image computing is beyond the scope of the review. Searches were performed on PubMed and IEEE Explore using combinations of keywords: ML, surgery, robotics, surgical and medical robotics, skill learning, skill analysis and learning to perceive. RESULTS: Studies making use of ML methods in the context of surgery are increasingly being reported. In particular, there is an increasing interest in using ML for developing tools to understand and model surgical skill and competence or to extract surgical workflow. Many researchers begin to integrate this understanding into the control of recent surgical robots and devices. CONCLUSION: ML is an expanding field. It is popular as it allows efficient processing of vast amounts of data for interpreting and real-time decision making. Already widely used in imaging and diagnosis, it is believed that ML will also play an important role in surgery and interventional treatments. In particular, ML could become a game changer into the conception of cognitive surgical robots. Such robots endowed with cognitive skills would assist the surgical team also on a cognitive level, such as possibly lowering the mental load of the team. For example, ML could help extracting surgical skill, learned through demonstration by human experts, and could transfer this to robotic skills. Such intelligent surgical assistance would significantly surpass the state of the art in surgical robotics. Current devices possess no intelligence whatsoever and are merely advanced and expensive instruments

On the Underestimation of Flood Risk for Locationsdownstream from Flood Control Reservoirs

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

SOLAR DRYER WITH BIOMASS BACKUP HEATER FOR DRYING FRUITS: DEVELOPMENT AND PERFORMANCE ANALYSIS

Most solar dryers rely on only solar energy as the heat source. This condition limits its use in off -sunny periods such as cloudy, rainy seasons and after sunset. The objectives of this study were to: develop a solar dryer with biomass backup heater for drying fruits; analyze its performance; and carry out comparative analysis of the dryer with and without biomass backup heater. An indirect solar dryer was designed, constructed and analysed using 4mm slices of pineapples and mangoes. Temperature, humidity and ambient air temperature were measured using Tinytag data loggers, EasyLog – USB 2 and HI 91610C Thermo-hygrometer. A 300g weight of charcoal, costing GHC 0.5 (US$0.16)was fed into the backup heater every 1-2 hours with a running cost of US$ 1-2.88/day. The results showed that the moisture content (MC) of the pineapples reduced from 87% to 16%(wb) and that of mangoes reduced from 85% to 15.5% (wb). On average, solardrying with backup took 14-18 sunshine hours to attain the desired MC, while that without backup took 20-27 sunshine hours. With biomass backup heater the drying rates were: pineapples (32.5g/h) and mangoes (19.3g/h), while without backup the drying rates were: pineapples (23.7g/h) and mangoes (15.5g/h). Better performance was obtained when the dryer was with a biomass backup heater.Keywords: Moisture; dryer; temperature; solar; biomas

Gender, Disaster, and Resilience: Assessing Women\u27s Water and Sanitation Needs in Leogane, Haiti, before and after the 201 O Earthquake

This study investigates differences in men\u27s and women\u27s access to water and sanitation in Leogane, Haiti (population -300,000), a town situated at the epicenter of the January 2010 earthquake. While research suggests that women\u27s water and sanitation access is crucial to health, security, and equity in post-disaster situations, there are a number of limitations to current participa­tory approaches in post-disaster reconstruction. Underlining the social impor­tance of water access in Haiti were reports citing a Jack of potable water and sanitation as one factor contributing to the spread of cholera, which was intro­duced by UN peacekeepers aher the earthquake. Limited access to water and sanitation facilities was also reported as a factor in the lack of security for women and children in the internally displaced persons camps. The results of this NSF-RAPID study are presented pertaining to gender issues in the context of post-disaster infrastructure reconstruction efforts in Haiti. We ask specifically how gender dimensions can be integrated into community-based participatory processes of water and sanitation planning, which face many challenges in post-disaster situations. We conclude that more robust participatory processes that include women and other marginalized groups in planning and decision ­making can be used to elicit and support local knowledge, practices and preferences, ultimately leading to more appropriate infrastructure systems that will be more socially, economically, and ecologically sustainable

Ugandan stakeholder hopes and concerns about gene drive mosquitoes for malaria control:New directions for gene drive risk governance

This is the final version. Available on open access from BMC via the DOI in this record. Availability of data and materials: The datasets generated during and/or analyzed during the current study are available in the UK DATA SERVICE repository, https://ukdataservice.ac.uk/. The datasets during and/or analyzed during the current study are also available from the corresponding author on reasonable request.Background: The African Union’s High-Level Panel on Emerging Technologies identified gene drive mosquitoes as a priority technology for malaria elimination. The first field trials are expected in 5–10 years in Uganda, Mali or Burkina Faso. In preparation, regional and international actors are developing risk governance guidelines which will delineate the framework for identifying and evaluating risks. Scientists and bioethicists have called for African stakeholder involvement in these developments, arguing the knowledge and perspectives of those people living in malaria-afflicted countries is currently missing. However, few African stakeholders have been involved to date, leaving a knowledge gap about the local social-cultural as well as ecological context in which gene drive mosquitoes will be tested and deployed. This study investigates and analyses Ugandan stakeholders’ hopes and concerns about gene drive mosquitoes for malaria control and explores the new directions needed for risk governance. Methods: This qualitative study draws on 19 in-depth semi-structured interviews with Ugandan stakeholders in 2019. It explores their hopes for the technology and the risks they believed pertinent. Coding began at a workshop and continued through thematic analysis. Results: Participants’ hopes and concerns for gene drive mosquitoes to address malaria fell into three themes: (1) ability of gene drive mosquitoes to prevent malaria infection; (2) impacts of gene drive testing and deployment; and, (3) governance. Stakeholder hopes fell almost exclusively into the first theme while concerns were spread across all three. The study demonstrates that local stakeholders are able and willing to contribute relevant and important knowledge to the development of risk frameworks. Conclusions: International processes can provide high-level guidelines, but risk decision-making must be grounded in the local context if it is to be robust, meaningful and legitimate. Decisions about whether or not to release gene drive mosquitoes as part of a malaria control programme will need to consider the assessment of both the risks and the benefits of gene drive mosquitoes within a particular social, political, ecological, and technological context. Just as with risks, benefits—and importantly, the conditions that are necessary to realize them—must be identified and debated in Uganda and its neighbouring countries.British Academ

Predictors of HIV/AIDS preventive behavior among undergraduate health science university students in Northwest Ethiopia, 2022. Institution-based cross-sectional study.

INTRODUCTION: Human immunodeficiency virus (HIV) infection is a major global public health issue, affecting millions of people annually. University students are among the risk groups in the community because of their high-risk behaviors. Few studies have been conducted on HIV/AIDS preventive behaviors and associated factors among university students. Therefore, focusing on these target populations is crucial because it will help university managers and different stakeholders be informed about the burden of the problem and take different measures to halt the distribution of the infection. OBJECTIVE: To assess the predictors of HIV/AIDS preventive behaviors among undergraduate Health Science University students in Northwest Ethiopia in 2022. METHODS: This study used an institution-based cross-sectional design with a single-population proportion formula, and participants were selected using a simple random sampling technique. Data were entered into Epi Data version 4.6.0.2 and exported to SPSS version 26 for cleaning and analysis, and the results were presented using text, graphs, pie charts, percentages, and frequencies. Bivariate and multivariable logistic regression analyses were used, and variables with a p-value of ≤0.25 in the bivariate analysis were entered into the multivariable analysis. A p-value of less than or equal to 0.05 in the multivariable analysis was considered statistically significant. RESULT: Out of 287 study participants, 284 of them responded completely, with a response rate of 99.0 %. Among the total respondents, 42.3 % (95 % CI: 37.7, 47.8) of the participants had poor HIV/AIDS preventive behavior. Younger age (AOR: 3.05; 95 % CI (1.243, 7.496)), low perceived susceptibility (AOR: 2.12; 95 % CI (1.179, 3.809), low perceived severity (AOR: 3.00; 95 % CI (1.636, 5.509)), high perceived barriers (AOR: 2.78; 95 % CI (1.487, 5.202)), and having poor HIV/AIDS preventive knowledge (AOR: 3.87; 95 % CI (2.170, 6.919)) were significantly associated with poor HIV/AIDS preventive behaviors. CONCLUSION: The HIV/AIDS preventive behavior of participants in this study was poor. Young age, low perceived susceptibility, low perceived severity, high perceived barriers, and poor HIV/AIDS preventive knowledge were predictors of poor HIV/AIDS preventive behavior. It is better to design strategies and programs by the Ministry of Health, the Ministry of Education, university top managers, and other stakeholders to provide appropriate information and focus on behavioral changes in vulnerable population groups

Depression and its associated factors among adult hypertensive patients attending follow-up in South Gondar zone public hospitals, Ethiopia, 2023.

INTRODUCTION: Depression is the most common public health issue affecting the world's population. Like patients with other chronic medical diseases, hypertensive patients experience many intense emotions which increase their risk for the development of depression. This study aimed to assess the magnitude of depression and its associated factors among hypertensive patients in South Gondar zone governmental hospitals, Northwest Ethiopia, 2023. METHODS: An institutional-based cross-sectional study was used in government hospitals of South Gondar Zone. A total of 311 patients were sampled randomly and included in the study. Statistical Package for Social Sciences (SPSS) version 25 was used for analysis. Data were analyzed mainly by using descriptive statistics and binary logistics regression. RESULTS: A total of 311 patients participated with a 100% response rate. Almost half of the participants were female. The mean age of the respondents was 58.85 years. More than 60% of the respondents had a co-morbid illness. Among participants, 83 (26.7%) of hypertensive patients had depression. Being female, age, uneducated, having poor social support, the presence of co-morbid illness and complications, uncontrolled hypertension, having less than or equal to two dietary regimen and duration of hypertension greater than ten years were significantly associated with depression. CONCLUSION: The magnitude of depression was found to be high. This indicated that depression is a common co-morbid illness among hypertensive patients. Healthcare professionals and other stakeholders should consider and diagnose co-morbid diseases like depression among hypertensive patients. It is also better to give particular emphasis to highly vulnerable groups like females, elders, uneducated and those who have poor social support

Prevalence of hazardous alcohol consumption and associated factors among HIV-positive pregnant women attending public hospitals in Northwest Ethiopia: a multicentred cross-sectional study.

BACKGROUND: Alcohol is a major public health problem in pregnant women due to its harmful effects on pregnancy and adverse birth outcomes. Therefore, assessing the prevalence and the factors associated with hazardous alcohol consumption among HIV-positive women is important for early identification and intervention and implementation of rehabilitation centres in healthcare settings in order to prevent maternal adverse birth outcomes. OBJECTIVE: The aim of this study was to assess the prevalence of hazardous alcohol consumption and the associated factors among HIV-positive pregnant women attending public hospitals in Northwest Ethiopia. DESIGN AND STUDY SETTING: A facility-based, cross-sectional study was conducted among 401 HIV-positive pregnant women attending public hospitals in Northwest Ethiopia from 7 February to 7 April 2021. PARTICIPANTS: From a total calculated sample size of 423, 401 HIV-positive pregnant women who had a follow-up with selected hospitals' prevention of mother-to-child transmission (PMTCT) clinics completed the interview (17 participants refused to provide information and 5 terminated the interview in the middle of it due to serious illness). MAIN OUTCOME MEASURES: The main outcome measure of this study was hazardous alcohol consumption assessed using the Fast Alcohol Screening Test. Bivariate and multivariable binary logistic regressions were used to identify factors associated with hazardous alcohol consumption. Statistically significant associations were set at p<0.05. RESULTS: The overall prevalence of hazardous alcohol consumption among HIV-positive pregnant was found to be 7.7% (95% CI 5.2, 10.5). After adjusting for possible confounders, history of mental illness (adjusted OR (AOR)=3.10; 95% CI 1.19, 8.05), having comorbid psychological distress (AOR=4.39; 95% CI 1.57, 12.30), non-disclosure of HIV status to partner (AOR=3.28; 95% CI 1.21, 8.84) and poor medication adherence (AOR=2.82; 95% CI 1.20, 6.62) were significantly associated with hazardous alcohol use. CONCLUSIONS AND RECOMMENDATIONS: The overall prevalence of hazardous alcohol consumption among HIV-positive pregnant women was high, especially among pregnant women who had a history of mental illness. Poor medication adherence, non-disclosure of HIV status to partner and having comorbid psychological distress are the main factors associated with hazardous alcohol consumption. Early detection and appropriate interventions to prevent hazardous alcohol consumption should be promoted at PMTCT clinics

The magnitude of common mental illness and associated factors among adult holy water users in Amhara regional state Orthodox Tewahido churches, Ethiopia, 2021.

BACKGROUND: Because they are prevalent, persistent, and have substantial negative effects on physical health, psychological well-being, and economic implications, common mental illnesses like depression, anxiety, and somatic complaints are major public health problems. Patients with mental illness are devoted to religious therapy including holy water as a coping mechanism for their illnesses. The aim of this study was to investigate the magnitude and associated factors of common mental illness among adult holy water users. METHODS: Facility-based cross-sectional study design was conducted in Amhara regional state orthodox Tewahido churches. A simple random sampling techinque was used to select participants. Data were collected by using the Brief Psychiatric Rating Scale for mental illnesses symptoms and a structured interviewer administered questionnaire was used. Data were entered into EpiData version 4.6 and exported to SPSS version 25 for analysis. Variables with a p-value of 0.25 in the bivariable logistic regression were entered into multivariable logistic regression. RESULT: Three hundred eighty-two participants were involved in the study. The magnitude of Common mental illnesses among holy water users was 58.9%. Unemployed, using more than one substance, having Poor and moderate social support, current daily alcohol drinker and past history of mental illness were significantly associated with common mental illness. CONCLUSION: The magnitude of common mental illness among adult holy water users was high. Giving special attention to decreasing unemployment, establishing social support services, and decreasing substance utilization are the keys to preventing common mental illnesses