Search Results (91)

The transportation and automotive industries are slowly integrating biocomposite materials into products where the economics make sense; this typically means a short manufacturing cycle time, not using expensive prepreg, and with little waste generated from the process. In a previous investigation into the use of biocomposites for electric bus seats and backs, three different material systems (hemp, flax, and pure cellulosic fibers, each paired with a high-bio-content epoxy) and two manufacturing processes (wet layup followed by compression molding, vacuum-assisted resin transfer molding) were investigated, but neither process proved to be viable. In this paper, a relatively obscure process called Wet Compression Molding (WCM) is considered for economical production of the biocomposite bus seats using the same three material systems. Darcy’s law predictions of full impregnation time for a nominally 3.5 mm thick part using experimentally determined permeability values are all less than 2 s. Furthermore, prepreg is not used, and net-shape parts without excess resin show potential. Important design details of the WCM mold set, used in the manufacturing of flat test panels from each material system, that are generally not discussed in the literature include a high-pressure O-ring seal, and semi-permeable membranes covering injection pins and vacuum vents (evacuates trapped air) to prevent resin ingress. Biocomposite laminate specimens are fabricated using the mold set in a thermal press and a vacuum pump. Part characterization includes fiber volume fraction estimates and measurements of thickness, density, flexural modulus, and outer fiber maximum stress at failure. Due to its rapid impregnation with just enough resin, WCM should be considered for the economical manufacture of parts similar in shape and size to electric bus seats and backs. Full article

Background: Missed miscarriage (MM) is a common first-trimester complication. Misoprostol alone achieves moderate success, while combination therapy with mifepristone improves outcomes in spontaneous pregnancies. Evidence in assisted reproductive technology (ART) pregnancies is scarce. We evaluated whether combined mifepristone–misoprostol improves outcomes in ART pregnancies compared with misoprostol alone and compared results with spontaneously conceived (SC) pregnancies. Methods: This retrospective matched cohort study was conducted at a single center (2017–2024). ART pregnancies were matched 1:2 with SC pregnancies by maternal age. Patients received misoprostol alone or 200 mg mifepristone followed 48 h later by misoprostol. The primary outcome was treatment success, defined as complete uterine evacuation without repeat misoprostol or surgery. Secondary outcomes included emergency visits, surgical procedures, and ART-related predictors. Subgroup analyses were performed by ART protocol. Results: Among 307 patients (94 ART, 213 SC), combined therapy yielded higher success than misoprostol alone in SC (84% vs. 71%, p = 0.023) and ART pregnancies (95% vs. 80%, p = 0.035). In hormonally supported frozen embryo transfer (HRT-FET) cycles, success was 100% with combined therapy versus 80% with misoprostol alone. Conclusions: Combined mifepristone–misoprostol is more effective than misoprostol alone, with particularly high success in HRT-FET cycles. Full article

Designing fire evacuation strategies for hospitals involves navigating complex infrastructure and accommodating the unique needs of patients, many of whom may have limited mobility or require specialized support during emergencies. This study examines critical egress parameters and their impact on evacuation efficiency in hospital environments, emphasizing configurations that can improve safety and reduce evacuation time. Although the inclusion of smoke effects in recent evacuation models is gaining traction, their combined impact with assisted evacuation scenarios in hospital settings remains underexplored. By integrating smoke propagation data into evacuation modelling, we analyze the effects of reduced visibility and smoke spread on egress routes and occupant behavior. Findings show that smoke effects significantly increase evacuation time estimates (around 50%) compared to traditional models (without accounting for smoke effects), highlighting the risk of underestimation in practical applications, particularly in regions where strict codal compliance is lacking. The study also reveals that stairway width, number, and location substantially affect evacuation times, with about 40% reduction achieved by increasing stairway width from 44 to 66 inches. Additionally, situational awareness enhancements, such as real-time information on fire location and safe exits, can improve evacuation efficiency by about 35%. For taller hospital buildings, the findings highlight the need for implementation of situational awareness in addition to optimized egress planning to achieve safe and efficient evacuation strategies. Full article

Background: Superomedial pedicle breast reduction is a widely performed procedure in plastic surgery. However, in cases of massive ptosis and excessively large breasts, achieving adequate pedicle reduction can be challenging. Direct excision of the tissue bulk may compromise blood supply while insufficient reduction can hinder proper pedicle positioning or result in strangulation when forcefully placed in the keyhole area. This study investigates the application of power-assisted liposuction (PAL) to the superomedial pedicle, aiming to achieve volume reduction while preserving its vascular integrity. Methods: Patients who underwent reduction mammaplasty with concomitant PAL were retrospectively reviewed. Parenchymal resection was performed first, followed by PAL, which was selectively applied to the pedicle. Eligibility for liposuction was made intraoperatively based on breast morphology and the ease of pedicle insetting. Results: The mean lipoaspirate per breast was 243.0 mL (SD 131.3) following a mean resection weight of 1261.7 g (SD 356.9). In 76.7% of cases, more than 150 mL was aspirated. The smallest volume per breast was 50 mL, while the highest reached 500 mL. A strong correlation was observed between the aspirated volume and resection weight. The overall complication rate was 3.3%, with one patient requiring hematoma evacuation. No cases of NAC necrosis occurred. All patients reported satisfactory breast shape and size. Conclusions: Power-assisted liposuction of the superomedial pedicle is a reliable and efficient technique for reshaping and reducing the pedicle while maintaining a low risk of complications. Full article

With the rapid expansion of urban underground spaces, safety concerns related to ascending evacuation have become increasingly critical, particularly for children, who are more susceptible to fatigue than adults. However, most existing research focuses on adults and overlooks the unique needs of children. This study investigated two key fatigue-related factors, evacuation height and body mass index (BMI), to construct a predictive model of children’s fatigue levels and proposed a non-invasive, code-compliant assistive solution integrated into underground fire escape stairways. Data were collected from 41 child participants during an ascending evacuation under simulated emergency conditions using real-time heart rate monitoring and video analysis. Statistical correlation and regression modeling revealed a significant positive correlation between evacuation height and heart rate (p < 0.01). Female participants exhibited higher mean heart rates and greater variability, with a strong positive correlation between BMI and heart rate observed in females (p < 0.01). Regression analysis showed that heart rate increased with BMI but plateaued in the obese group. These findings demonstrate that evacuation height and BMI significantly influence children’s fatigue levels. Based on these physiological insights, this study proposes a non-invasive architectural intervention to enhance children’s evacuation performance, offering practical guidance for the design of intelligent evacuation systems. Furthermore, it provides theoretical support for child-centered assistive design and safety improvement within the boundaries of current fire protection codes. Full article

Decarbonisation in hot climates demands innovative cooling solutions that minimise environmental impact through renewable energy integration and advanced system optimisation. This study investigates the energetic and economic feasibility of a thermo-mechanical vapour compression (TMVC) cooling system that integrates a conventional vapour compression cycle with an ejector and a thermally driven second-stage compressor powered by solar-heated water from evacuated flat-plate collectors. The system is designed to reduce mechanical compressor work and enhance cooling performance in hot climates. A comprehensive 4E (energy, exergy, economic, and environmental) analysis is conducted for a multi-story residential building in Baghdad, Iraq, with a total floor area of approximately 8000 m² and a peak cooling demand of 521.75 kW. Numerical simulations were conducted to evaluate various configurations of solar collector areas, thermal storage tank volumes, and collector mass flow rate, aiming to identify the most energy-efficient combinations. These optimal configurations were then assessed from economic and environmental perspectives. Among them, the system featuring a 600 m² collector area and a 34 m³ storage tank was selected as the optimal case based on its superior electricity savings and energy performance. Specifically, this configuration achieved a 28.28% improvement in the coefficient of performance, a 22.05% reduction in energy consumption, and an average of 15.3 h of daily solar-assisted operation compared to a baseline vapour compression system. These findings highlight the potential of the TMVC system to significantly reduce energy usage and environmental impact, thereby supporting the deployment of sustainable cooling technologies in hot climate regions. Full article

Carbon fiber reinforced polymers (CFRPs) are significantly vital for industries. However, the drilling process of a CFRP is considered a challenge due to its nature, which causes delamination, fiber pull-out, peel-up, high friction, and a decrease in cutting tool life. Wet drilling is necessary for minimizing defects, and lubricants are very costly. In the current work, ultrasonic-assisted drilling (UAD) with a longitudinal vibration of 39.7 kHz was applied to the drill bit in the feed direction, used for CFRPs, and compared with conventional drilling (CD). Low spindle speeds under 5000 rpm were applied with different feed rates. The morphology, delamination factor, and cutting forces were investigated through the specific input machining parameters for CD and UAD. SEM was applied to study the morphology of the hole entrance and exit as well as the burr heights of evacuated chips. UAD with 39.7 kHz succeeded in minimizing the surface roughness by 50% compared with the surface roughness resulting from CD and could drill high-precision holes for CFRPs with a trade-off concept, besides achieving near-zero delamination (K ≃ 1) in the absence of a lubricant, which is being extended for industrial application. Full article

The Internet of Things (IoT) offers transformative capabilities in enhancing public safety, disaster response, and emergency management by leveraging interconnected devices and real-time data. Through the IoT, smart sensors and networks are deployed across cities and environments to monitor critical parameters including air quality, structural integrity, and environmental changes. These systems provide early warnings for natural disasters such as earthquakes, floods, and wildfires, enabling authorities to respond proactively. In emergency management, IoT devices help coordinate resources and improve situational awareness during crises. Real-time data from wearable devices, smart infrastructure, and communication systems allow responders to track people, manage evacuations, and deploy resources more effectively. For example, IoT-enabled drones and autonomous vehicles are used to deliver supplies or assess damage in hazardous areas without risking human lives. IoT technologies improve post-disaster recovery by continuously monitoring areas for safety hazards and supporting infrastructure restoration. Smart traffic management systems assist in controlling traffic flow for emergency vehicles, while IoT-based communication networks ensure connectivity when traditional systems fail. The IoT significantly enhances the speed, accuracy, and effectiveness of disaster response and public safety operations, leading to the better protection of communities and faster recovery from emergencies. Full article

Background/Objectives: In 2019, the Italian Constitutional Court (ICC) stated that the principles of equality, dignity, and self-determination enshrined in the constitution require that assisted suicide be considered lawful under certain conditions, including that the patient is kept alive through life-sustaining treatments. In fact, since such patients could already die by refusing treatment, assisted suicide is ethical as it allows them to die more quickly and with dignity. The paper aims to analyze the requirement of life-sustaining treatments from a legal and comparative perspective. Methods: The authors performed the search on Italian legal databases as well as on Scopus and PubMed and by comparing Italian regulations with those of Spain, Portugal, and Austria, which are similar to the Italian one in their fundamentally restrictive nature. The authors have delved into the Italian legal system through an analytical method of interpretation of the normative texts and used the comparative method to investigate which of the legal systems considered is more permissive. Results: According to the ICC, continuing to prohibit assisted suicide for patients who do not require life-sustaining treatments is not discriminatory: these patients cannot be equated with others, as only in the former case does refusing treatment lead to death. From its personalist ethical framework, the ICC also rejected the claim that the patient’s self-determination is being infringed upon: self-determination must be balanced with the protection of life, which is a fundamental value. However, in 2024, the ICC clarified that life-sustaining treatments are not limited to those directly supporting vital functions through medical machines, but also include all treatments without which the person would die in a short time, such as manual bowel evacuation. Conclusions: The current Italian regulation seems inconsistent. It would be preferable to regulate assisted suicide by referencing the models of Spain, Portugal, and Austria. Full article

Emerging trends in heat pump (HP) and electric vehicle (EV) adoption within communities aim to reduce carbon emissions in the heating and transportation sectors. However, these technologies rely on grid electricity, whose carbon intensity varies over time. This study explores how the carbon-saving potential of these technologies can be further enhanced through demand-shifting operations and renewable energy integration. The research compares photovoltaic–thermal (PV/T) and hybrid solar heat pump systems that integrate EV charging and PCM-enhanced heat storage to improve space heating efficiency under low solar irradiance in the UK while reducing CO₂ emissions. The study simulates solar collector configurations and sizes, combining PV modules and heat pumps to enhance system performance. Control systems synchronize operations with periods of low grid CO₂ intensity, minimizing the environmental impact. The analysis evaluates PV/T systems, separate PV and thermal collectors, highlighting their energy efficiency and CO₂ reduction potential. Control systems further optimize HP operation and EV charging during periods of high renewable energy availability, preventing uncontrolled use that could result in elevated emissions. Using real weather data and a detailed building model, the findings show that a solar-assisted HP with 100% thermal collectors achieves a daily COP of 3.49. Reducing thermal collectors to 60% lowers the COP to 2.57, but PV output compensates, maintaining similar emission levels. The system achieves the lowest emission with high-efficiency evacuated flat plate PV/T collectors. Full article

On 1 January 2024, a magnitude 7.5 earthquake struck the Noto Peninsula in Ishikawa Prefecture, Japan, causing substantial damage to northern Noto. This study aimed to clarify the experiences of patients using a psychiatric visiting nurse service who were affected by the earthquake, and the influencing factors of worsening mental health symptoms after the earthquake. Participants were 114 patients using a psychiatric visiting nurse service in northern Noto. Data were collected retrospectively from nursing records. Factors associated with signs of worsening mental health symptoms were the continued use of home visiting nursing services after the disaster (n = 43, 46.7%; p = 0.040) and the intervention of a disaster psychiatric assistance team (DPAT) (n = 7, 77.8%; p = 0.034). No significant correlation was found between the number of relocations owing to evacuation and signs of worsening mental health symptoms. Although 61.4% of participants experienced more than one evacuation, the number of evacuations and relocations did not seem to directly affect the worsening of mental health symptoms. However, the results suggest a need for more direct interventions, such as the continued use of home visiting nursing services and the involvement of DPATs as an external resource, for patients exhibiting signs of worsening mental health symptoms. Full article

Ultrasound imaging is commonly used for medical triage in both civilian and military emergency medicine sectors. One specific application is the eFAST, or the extended focused assessment with sonography in trauma exam, where pneumothorax, hemothorax, or abdominal hemorrhage injuries are identified. However, the diagnostic accuracy of an eFAST exam depends on obtaining proper scans and making quick interpretation decisions to evacuate casualties or administer necessary interventions. To improve ultrasound interpretation, we developed AI models to identify key anatomical structures at eFAST scan sites, simplifying image acquisition by assisting with proper probe placement. These models plus image interpretation diagnostic models were paired with two real-time eFAST implementations. The first implementation was a manual AI-driven ultrasound eFAST tool that used guidance models to select correct frames prior to making any diagnostic predictions. The second implementation was a robotic imaging platform capable of providing semi-autonomous image acquisition combined with diagnostic image interpretation. We highlight the use of both real-time approaches in a swine injury model and compare their performance of this emergency medicine application. In conclusion, AI can be deployed in real time to provide rapid triage decisions, lowering the skill threshold for ultrasound imaging at or near the point of injury. Full article

The extent of casualty and property loss due to chemical accidents depends on how well the emergency action plan was established in advance and how fast the warning notice and evacuation orders are given to the public. Assistant methods for the establishment of protective action plans have been developed for several decades. However, the currently developed decision trees are complicated, so they may require a detailed analysis, and previous decision matrices do not consider the indoor and outdoor concentration directly and hence do not allow a change in evacuation order. In this study, five key parameters, report time, toxic cloud arrival/removal time and indoor/outdoor concentration, are selected for the evacuation decision, and the effectiveness of leakage and wind speed on five parameters is investigated. CFD simulations are performed for the various values of mass flow rate and wind speed. Near the release point of toxic gas, the maximum concentration is unaffected by wind speed, but the mass flow rate significantly influences it at low wind speeds. In the far field, the maximum concentration decreases with increasing wind speed. The termination time for shelter-in-place, suggesting a shift to evacuation, decreases with both higher mass flow rate and wind speed. For smaller mass flow rates ($\dot{m}=0.1\mathrm{kg}/\mathrm{s}$), indoor concentration exceeds outdoor levels after 25.9 min, while for larger mass flow rates ($\dot{m}=2.0\mathrm{kg}/\mathrm{s}$), this time shortens to 15.2 min. Increasing wind speed from 0.5 $\mathrm{m}/\mathrm{s}$ to 5.0 $\mathrm{m}/\mathrm{s}$ decreases the equilibrium concentration from 13.9 $\mathrm{ppm}$ to 3.4 $\mathrm{ppm}$ and reduces the escape time from 48.9 min to 16.0 min. Overall, higher mass flow rates and wind speeds shorten the equilibrium and escape times, improving toxic cloud removal efficiency. Based on the simulation results, a new evacuation decision matrix is developed which minimizes the total exposure concentration. This study provides the proper evacuation time along distance which eventually prevents traffic congestion because of the simultaneous escape rush. Full article

Despite the dismantling structures that are submerged to significant depths of water during the decommissioning of nuclear power plants, there is limited research on deep-water laser cutting processes. A self-designed pressurized chamber was used in this study and successfully conducted the world’s first laser cutting experiment in a simulated 10 m water depth environment. laser cutting was performed in a 10 m underwater environment, and the cutting efficiency was compared to that observed in a 1 m underwater environment. Therefore, A 100 mm thickness of 304 stainless steel was successfully cut underwater, and the highest cutting speed of 100 mm/min was achieved. The result indicates that, as the cutting speed increased during underwater laser cutting, both the heat input and the mass flow rate of the assist gas decreased, resulting in a narrower rear kerf width and an ineffective evacuation of the molten metal. Full article

Predicting the distribution of people in the time window approaching a disaster is crucial for post-disaster assistance activities and can be useful for evacuation route selection and shelter planning. However, two major limitations have not yet been addressed: (1) Most spatiotemporal prediction models incorporate spatiotemporal features either directly or indirectly, which results in high information redundancy in the parameters of the prediction model and low computational efficiency. (2) These models usually incorporate certain basic and external features, and they can neither change spatiotemporal addressed features according to spatiotemporal features nor change them in real-time according to spatiotemporal features. The spatiotemporal feature embedding methods for these models are inflexible and difficult to interpret. To overcome these problems, a lightweight population density distribution prediction framework that considers both basic and external spatiotemporal features is proposed. In the study, an autoencoder is used to extract spatiotemporal coded information to form a spatiotemporal attention mechanism, and basic and external spatiotemporal feature attention is fused by a fusion framework with learnable weights. The fused spatiotemporal attention is fused with Resnet as the prediction backbone network to predict the people distribution. Comparison and ablation experimental results show that the computational efficiency and interpretability of the prediction framework are improved by maximizing the scalability of the spatiotemporal features of the model by unleashing the scalability of the spatiotemporal features of the model while enhancing the interpretability of the spatiotemporal information as compared to the classical and popular spatiotemporal prediction frameworks. This study has a multiplier effect and provides a reference solution for predicting population distributions in similar regions around the globe. Full article