Pressure Research Articles

Synthesis of highly stable nitrogen doped carbon encapsulated nano Cu2O pom discs (NCEN[sbnd]Cu2O pom discs) and its click chemistry

Click chemistry has growing impact in drug discovery. It is an azide alkyne cycloaddition in presence of Cu(I) catalyst. Click reaction gives high yields with a variety of starting materials and easy to perform and insensitive to oxygen or water. However vast applications of Click reactions were studied with homogeneous catalyst. Main disadvantages of homogeneous catalysts are processing of the product and regeneration of the catalyst. These disadvantages can overcome by the use of heterogeneous catalysts. Thus heterogeneous catalysts are highly economic in industrial applications. This article reports the synthesis of highly stable and reusable heterogeneous nitrogen doped carbon encapsulated nano Cu2O (NCEN Cu2O) pom discs. These pom discs were synthesized under normal temperature and pressure conditions by using copper nitrate as precursor and triethanolamine as stabilizing agent, hydrazine hydrate as reducing agent. Water and propanol were used as solvents. Thus obtained reddish brown powder was washed with ethanol and filtered using membrane and analyzed using powder XRD, FT-IR, and TGA, SEM, SEM–EDX, TEM, TEM-EDX, TEM-SAED, HR-TEM analyses. And it showed high activity and reproducibility towards Click chemistry in synthesis of 1,2,3 triazoles.

Development and Usability Evaluation of Augmented Reality Content for Light Maintenance Training of Air Spring for Electric Multiple Unit

The air spring for railway vehicles uses the air pressure inside the bellows to absorb vibration and shock to improve ride comfort and adjust the height of the underframe with a leveling valve to control stable driving of the train. This study developed augmented reality content that proposes a novel visual technology to effectively support the training of air spring maintenance tasks. In this study, a special effect algorithm that displays the dispersion and diffusion of fluid, and an algorithm that allows objects to be rotated at various angles, were proposed to increase the visual learning effect of fluid flow for maintenance. The FDG algorithm can increase the training effect by visualizing the leakage of air at a specific location when the air spring is damaged. In addition, the OAR algorithm allows an axisymmetric model, which is difficult to rotate by gestures, to be rotated at various angles, using a touch cube. Using these algorithms, maintenance personnel can effectively learn complex maintenance tasks. The UMUX and CSUQ surveys were conducted with 40 railway maintenance workers to evaluate the effectiveness of the developed educational content. The results showed that the UMUX, across 4 items, averaged as score of 81.56. Likewise, the CSUQ survey score, consisting of 19 questions in 4 categories, was very high, at 80.83. These results show that this AR content is usable for air spring maintenance and field training support.

Efficient synthesis of lactic acid from cellulose through the synergistic effect of zinc chloride hydrate and metal salts

The chemocatalystic conversion of cellulose, the main component of lignocellulosic biomass, to building-block chemicals in water under mild conditions, is an ideal but highly challenging process due to the robust crystal structure of cellulose. It is also the key to establishing a sustainable biomass-based chemical process. Here, we present a highly efficient and selective chemocatalytic hydrolysis of cellulose using ZnCl2·3H2O hydrate as the pretreatment reagent and water-compatible metal salts - ErCl3 as the catalyst, into lactic acid (LA), which is an important chemical building-block widely utilized in the food industry and in the production of chemicals and biodegradable plastic. With 94.0 % conversion of cellulose, an impressive LA yield of 84.6 % was achieved at 170 °C after 4 h under ambient air pressure in water. High yields of LA were also obtained from other carbohydrates, such as fructose (68.3 %), glucose (52.7 %), starch (54.4 %), and inulin (67 %). A series of experiments demonstrated that Er(III) combination with water catalyzed cascading steps of soluble cellulose into LA after ZnCl2·3H2O hydrate disrupted the hydrogen bonds in the cellulose, Zn(II) played an indirect role by promoting LA formation through inhibition of side reactions. A plausible mechanism was proposed for the chemocatalytic conversion of cellulose to LA.

Effects of Psychosocial Risks on the Performance of Teacher-Researchers: Moroccan Context

In recent years, the concept of psychosocial risks has assumed enormous importance in working life. Indeed, PSR at work has become almost synonymous with work life and more specifically work stress, and it is widely accepted that work experiences can have a major impact on the psychological health of employees. Psychological risks are the human pressures that arise as a result of implementing an organization's strategy, and take different forms such as anxiety, pressure, violence, mental load and poor communication, musculoskeletal disorders and other pressures that are transmitted differently among employees depending on their position in the organization. Thus, mental health is an integral part of health and a state of happiness. In this state, a person can achieve self-actualization, overcome the normal pressures of life, engage in productive work and contribute to community life. Its degree is determined by social, psychological and biological factors. In the workplace, it is associated with psychosocial risk (PSR), which can cause a variety of discomforts and negative emotions about work. The assessment of PSR in the workplace is necessary, their identification allows to take preventive measures to have an objective impact on absenteeism, performance, productivity and health of workers and organizations In this sense, the objective of this work is to evaluate the prevalence of work-related psychological organizational constraints in the group of practicing teachers based on the Karasek model. This is a cross-sectional survey with data from 100 qualified teachers in elementary school, secondary schools and universities. The respondents were informed in advance of the purpose of the survey and the anonymity of the data. They are teachers, men and women of all ages, different learning levels, different cycles, different teaching professions and different levels of experience.

3D printing birdhouses with ceramic clay using a six-axis palletizing robot

Over the past few decades, billions of adult breeding birds have been lost worldwide. The primary factors for this population loss are habitat loss and global warming. To aid the efforts for bird conservation, we have designed a simple birdhouse that can be 3D printed rapidly using a six-axis arm robot. We transformed a six-axis palletizing robotic arm into a ceramic 3D printer with the help of an extruder, stepper motor, and a custom Printed Circuit Board (PCB) consisting of an ESP32 and a motor driver. The ceramic clay is stored in a pneumatic pressure tank. An air compressor pump transports the clay from the tank to the extruder. We conducted various experiments at 8–10 bars of air pressure with different water-to-clay ratios. We found that the optimum air pressure, water-to-clay ratio, and nozzle sizes are 10 bars, 0.084, and 5 mm, respectively. After determining the appropriate printing parameters, we designed the birdhouse in the Mastercam software and generated the G-code. The G-code is loaded onto the robot controller, and the birdhouse is printed in parts. We dried the birdhouse for 24 h and then baked it in a kiln for 24 h at 1000 degrees Celsius. We then compared the ceramic birdhouse to a wooden birdhouse. The ceramic birdhouse maintains internal temperatures of 38 degrees Celsius or lower despite external temperatures reaching 43 degrees Celsius, which is on par if not better than the wooden birdhouse. This temperature will be beneficial for nesting, breeding, and egg development.

METOVITAN INCREASES THE RESISTANCE OF THE BODY TO HYPOXIA

Aim. To study the efficacy of the vitamin preparation Metovitan and multivitamin preparation Decamevit in preventing the development of oxidative stress in the development of oxidative stress in rat tissues and their survival under hypoxic hypoxia. Methods. Experiments were performed on Wistar rats, 160-220 g. A model of hypoxic hypoxia was induced by lifting the rats in a barocamp to a conditional altitude of 11 thousand meters above sea level (pressure 190 mm Hg). Tissue metabolite concentrations and enzyme activities were measured using conventional biochemical methods. Results. The results of the study showed that the positive effect of Metovitan, which contained methionine and vitamins E, B1, and B3, on many indicators, including the activity of antioxidant defense enzymes, was significantly higher than the effect of Decamevit, which contained the same components plus vitamins A, B2, B6, B9, B12, vitamin C, and the bioflavonoid rutin. The survival time of rats treated with Metovitan before the experiment was one and a half times longer than that of Decamevit. Conclusion. A preparation containing a limited amount of vitamins acting synergistically on narrow links of cellular metabolism was more effective in preventing oxidative stress than a conventional multivitamin preparation.

Severe sepsis induced by zoledronic acid: A case report.

Zoledronic acid is one of the most commonly used intravenous, highly potent amino diphosphonate salts worldwide and is commonly used in patients with primary or secondary osteoporosis, most of whom are well tolerated. There are currently no reports of severe sepsis induced by zoledronic acid. Here we present the first case of severe sepsis induced by zoledronic acid. We reviewed the literature and found that there is currently a lack of reports on severe sepsis induced by zoledronic acid or other diphosphonates. A 58-year-old woman with severe osteoporosis and Behcet disease developed severe sepsis after treatment with zoledronic acid. Sepsis, septic shock, acute kidney injury, intestinal infection, Behcet disease. The patient was given intensive care immediately after admission, and massive fluid infusion to expand blood volume could not maintain normal blood pressure. Metaraminol was added to maintain circulatory stability, piperacillin-tazobactam was used to strengthen anti-infection, and glucocorticoids were used for anti-inflammatory treatment. The patient was discharged with improvement and followed up in the outpatient clinic. The inducing mechanism of zoledronic acid is not clear, but when the patient has immunosuppression, the use of zoledronic acid should be cautious and monitored. In conclusion, severe sepsis induced by zoledronic acid is a rare but serious complication, and physicians should be aware of this adverse event in time to avoid serious consequences.

Optic Nerve Head Morphological Variation in Craniosynostosis: A Cohort Study

To evaluate optic nerve head morphology in children with craniosynostosis versus healthy controls. Single-centre, prospective cohort study METHODS: Handheld optical coherence tomography (OCT) was performed in 110 eyes of 58 children (aged 0-13 years) with craniosynostosis. Inclusion criteria were as follows: normal intracranial pressure (ICP) on invasive overnight monitoring, or clinically stable ICP. The latter was defined as stable VA within 1 logMAR line and no papilloedema on fundoscopy for at least four months following OCT, and normal/stable visual evoked potentials. Control data for 218 eyes of 218 children were obtained from a published normative dataset. The main outcome measures were disc width, cup width, rim width and retinal nerve fibre layer (RNFL) thickness (nasal and temporal). Outcome measures were compared using three-way linear mixed model regression analysis (FGFR 1/2-associated craniosynostosis, non-FGFR 1/2-associated craniosynostosis, and controls). Out of 63 eligible children with craniosynostosis, handheld OCT imaging was successful in 110 eyes of 58 children (92%). Of these, 22 (38%) were female. Median subject age at OCT examination was 53 months (range: 2 to 157; IQR: 39 to 73). Twelve children (21%) had FGFR1/2-associated syndromes (Crouzon, n=6; Apert, n=4; Pfeiffer, n=2). Control data were available for 218 eyes of 218 healthy children. 122 controls (56%) were female. Median control age at OCT examination was 20 months (range: 0 to 163; IQR: 6 to 59). When comparing optic nerve head morphology in craniosynostosis (n=58) versus controls (n=218), disc width was 6% greater (p=0.001), temporal cup width was 13% smaller (p=0.027), rim width was 16% greater (p<0.001) and temporal RNFL was 11% smaller (p=0.027). When comparing FGFR1/2-associated syndromes (Crouzon, Apert and Pfeiffer syndromes, n=12) to the rest of the craniosynostosis group (n=46), disc width was 10% smaller (p=0.014) and temporal cup width was 38% smaller (p=0.044). This cohort demonstrated morphological differences of the optic nerve head in craniosynostosis, most markedly in Crouzon, Apert and Pfeiffer syndromes. These findings could help improve ophthalmological monitoring and surgical decision-making in children with craniosynostosis. Further work on longitudinal optic nerve head changes in syndromic and non-syndromic craniosynostosis would be valuable.

Characterization of Neutron Irradiator as a Source of Reference Radiation Field for Calibrating Dosemeters and Doserate Meters at PSI Laboratory

A new neutron calibration laboratory has been installed at the Paul Scherrer Institute in Switzerland. The calibration laboratory has been equipped with a newly developed neutron irradiator with two calibration benches, remote control instruments and related ancillary equipment for calibrating dosemeters and doserate meters. The actual dimensions of the calibration laboratory are 2.0 m (H) X 6.8 m (W) X 12.6 m (L). On the steel grid at a height of 2 m from the basement floor, two calibration benches are installed. A transport channel is installed in the middle of the benches for the transfer of the radiation sources. The radiation sources are moved from the safe position of the irradiator to the reference irradiation position using an air pressure unit. The reference position is at a height of 1.2 m from the grid floor. The neutron irradiator is equipped with two Am-Be sources. Characterization of neutron radiation field has been calculated in detail by the MCNPX neutron transport code as well as energy distribution of neutrons and contribution of scattered neutrons. Experimentally, it was measured with a neutron/gamma digital spectrometric system equipped with a stilbene detector. The quality of the neutron radiation field has been characterized by ambient dose equivalent rate and the shape of the Am-Be spectra has been verified with the ISO-8529 standard.

The effect of electro blow spinning parameters on the characteristics of polylactic acid nanofibers: Towards green development of high-performance biodegradable membrane

Electro-blow spinning represents a novel and emerging hybridised technology for producing high-quality, large-scale nanofibers. The applied pressure, accompanied by an electric field, functions as a drafting force to generate ultrafine, homogeneous nanofibers. Herein, we utilised a sustainable solvent to produce polylactic acid nanofibers via the electro-blow spinning technique. A parametric study investigating the effect of polymer concentration, pressure, and voltage on the characteristics of the produced nanofibers was thoroughly conducted. The produced nanofibers were tested using scanning electron microscopy, Fourier-transform infrared spectroscopy, differential scanning calorimetry, and tensile test. The findings revealed that air pressure plays a crucial role in the electro-blow spinning process, while introducing electric field enhances the spinnability and stretchability of nanofibers. Increasing the applied pressure and voltage led to finer fibres with improved crystallinity and mechanical strength. However, excessive pressure or voltage can cause jet instability, resulting in defects such as fused or broken fibres. Our study suggests that the most recommended parameters for uniform and high-quality nanofibers are 10 wt%, 5 bar, and 20 kV. Moreover, the polylactic acid nanofibers were further evaluated for air filtration performance using a customised filtration setup to determine their suitability as a facemask material. The results indicated a notably high filtration efficiency, reaching up to 98 %, with a corresponding pressure drop between 137 and 163 Pa. These preliminary findings strongly suggest that produced nanofibers are highly promising candidates for medical textile applications, particularly in the development of facemasks.

АЛГОРИТМ ЭКСПЕРСС-ОЦЕНКИ ВОЗДЕЙСТВИЯ НА ПОЧВУ ХОДОВЫХ СИСТЕМ ПРИЦЕПНЫХ ТРАНСПОРТНЫХ СРЕДСТВ

A reliable assessment of the level of impact on the soil from the propulsors of mobile agricultural machinery is possible only with an accurate measurement of the contour area of the contact surface of the tire with the support base. This indicator underlies all standard methods for determining the maximum normal pressure, maximum stresses and other indicators in the “wheel-soil” system. A simplified algorithm for determining the area of the contact patch of tires, which can be used both when assessing the level of pressure on the soil of existing trailed agricultural vehicles and newly developed ones, was proposed by the authors. In the first case, it is enough to measure the dimensional parameters of the tire mounted on the trailer: diameter, profile width, the amount of deformation under the influence of axial vertical load. In the second case, it is enough to take this data from catalogs with the technical characteristics of tires from specific manufacturers. The mathematical model used to determine the crosssectional area of the cylinder by the plane of the supporting surface located from the edge of the wheel at a distance equal to the tire deflection is the basis of the algorithm. The proposed methodology was tested by comparing the calculation results with the results of full-scale tests of 22 samples of agricultural tires installed on various types of transport and tractor units: carts, trailers, transfer bins. As a result of the research, a fairly high value of the modeling efficiency criterion was obtained (0.989), indicating a high level of convergence between the predicted (calculated) and observed (measured) values of the contact areas of the studied tire samples. Ease of use, versatility and accuracy sufficient for engineering calculations make the proposed algorithm convenient for wide practical use.

A simple subtropical high‐pressure system index over the South Atlantic

AbstractThis research introduces a novel index for the South Atlantic High Pressure (SAHP) system to enhance understanding of regional climate variability and change. Subtropical highs significantly influence regional climates, yet comprehensive indices to measure their behaviours are lacking. Utilizing ERA5 reanalysis data from 1940 to 2023, the proposed index estimates a weighted centroid of the area surrounding the maximum sea level pressure within a 3 hPa range. This method ensures robustness and flexibility in contiguous area estimation specific to subtropical high events. Results showed the index effectively reflects the position and intensity of the SAHP. The study reveals that latitudinal variability of the SAHP has a strong unimodal structure, whereas longitudinal variability exhibits a bimodal structure. Seasonal patterns of the index show noticeable changes, with winter (JJA) and spring (SON) months having relatively high index values compared to summer (DJF) and autumn (MAM) months, underscoring the intra‐annual variability of the SAHP index. During ENSO events, the mean centroid position of the SAHP shifts significantly, moving westwards and polewards during El Niño and showing greater stability during La Niña. The index, with minimal computation requirements and flexibility, can be applied across diverse datasets, aiding in the assessment of future subtropical high changes.

Emigration of Juvenile Tarpon Megalops atlanticus from Ephemerally Connected Coastal Ponds

Worldwide, coastal wetlands are threatened by disrupted hydrology, urbanization, and sea-level rise. In southwest Florida, coastal wetlands include tidal creeks and coastal ponds, which are the primary habitats used by juvenile Tarpon, Megalops atlanticus, an important sport fish. Coastal ponds can occur near uplands and are ephemerally connected to the open estuary, creating conditions of variable dissolved oxygen and salinity. Juveniles can tolerate wide-ranging abiotic conditions, but little is known about how they egress from their remote nursery habitats, which often requires them to cross > 1 km of mangrove forest to reach the open estuary. The objective of this study was to (1) compare Tarpon body condition among ponds close to the open estuary versus those ponds farther away on the Cape Haze peninsula of Charlotte Harbor, Florida, and (2) using acoustic telemetry determine what factors contribute to Tarpon emigration from the ponds to open estuarine waters. We tested the hypothesis that distinct groups of Tarpon occur in isolated ponds, leading to variation in fish length and body condition, and that opportunities for emigration from these ponds hinge on high water events. No pond stood out as having Tarpon of low body condition. Factors contributing to increased probabilities of Tarpon emigration were low barometric pressure, high-water level, and Tarpon body length. Tarpon emigrated from ponds near tidal creeks during summer king tides, while tropical cyclone conditions were needed to allow for movement from ponds farther in the landscape. The juvenile Tarpon were later detected at the mouths of large rivers 30 km up-estuary. The characterizations of water levels and event criteria needed for successful Tarpon nurseries should aid in habitat conservation and the creation of Tarpon nursery habitat in restoration designs.

A grey target performance evaluation model for aeroengine pressure test bench

PurposeThis paper aims to optimize the air pressure regulation scheme of the aeroengine pressure test bench.Design/methodology/approachBased on the requirements of pressure regulation process and the operating mechanism of aeroengine pressure test bench, a grey performance evaluation index system is constructed. The combination of principal component analysis and grey theory is employed to assign weights to grey indexes. The grey target evaluation model is introduced to evaluate the performance of historical regulation processes, and the evaluation results are analyzed to derive optimization mechanism for pressure regulating schemes.FindingsA case study based on monitoring data from nearly 300 regulation processes verifies the feasibility of the proposed method. On the one hand, the improved principal component analysis method can achieve rational weighting for grey indexes. On the other hand, the method comparison intuitively shows that the proposed method performs better.Originality/valueThe pressure test bench is a fundamental technical equipment in the aviation industry, serving the development and testing of aircraft engines. Due to the complex system composition, the pressure and flow adjustment of the test bench heavily rely on manual experience, leading to issues such as slow adjustment speed and insufficient accuracy. This paper proposes a performance evaluation method for the regulation process of pressure test bench, which can draw knowledge from historical regulation processes, provide guidance for the pressure regulation of test benches, and ultimately achieve the goal of reducing equipment operating costs.

Strength Development of Shotcrete in Compressed Air Pressurised Underground Environment

Shotcrete and compressed air are often utilised for providing temporary support in tunnel excavation. On occasions of concurrent application of shotcrete and compressed air, there would be concerns of the quality of concrete sprayed within pressurised space, as well as the strength development of shotcrete in pressurised environment. To address these concerns, field experimentation of the shotcrete strength development under compressed air pressure was conducted, and the results are reported in this paper.

Clinical correlates of obstructive sleep apnoea in idiopathic normal pressure hydrocephalus.

The pathogenesis of idiopathic normal pressure hydrocephalus (iNPH) remains controversial. Limited studies have indicated a high prevalence of obstructive sleep apnoea (OSA) amongst iNPH patients. The aim was to investigate the clinical correlates of OSA in iNPH patients. In this cross-sectional observational study, consecutive iNPH patients were prospectively enrolled. Evaluations included the iNPH Rating Scale, the Movement Disorder Society Unified Parkinson's Disease Rating Scale part III, the time and number of steps to walk 10 m, the Epworth Sleepiness Scale, the Pittsburgh Sleep Quality Index, a complete neuropsychological evaluation, 3-T brain MRI, full-night video-polysomnography, tap test and cerebrospinal fluid (CSF) neurodegeneration biomarkers. Fifty-one patients were screened, of whom 38 met the inclusion criteria. Amongst the recruited patients, 19/38 (50%) exhibited OSA, with 12/19 (63.2%) presenting moderate to severe disorder. OSA+ iNPH patients required more time (p = 0.02) and more steps (p = 0.04) to complete the 10-m walking test, had lower scores on the gait subitem of the iNPH Rating Scale (p = 0.04) and demonstrated poorer performance on specific neuropsychological tests (Rey Auditory Verbal Learning Test immediate recall, p = 0.03, and Rey-Osterrieth Complex Figure, p = 0.01). Additionally, OSA+ iNPH patients had higher levels of total tau (p = 0.02) and phospho-tau (p = 0.03) in their CSF but no statistically significant differences in beta-amyloid (1-42) levels compared to OSA- iNPH patients. Obstructive sleep apnoea is highly prevalent in iNPH patients, particularly at moderate to severe levels. OSA is associated with worse motor and cognitive performance in iNPH. The CSF neurodegeneration biomarker profile observed in OSA+ iNPH patients may reflect OSA-induced impairment of cerebral fluid dynamics.

Elevated blood pressure and hyperuricemia risk: a retrospective cohort study from Wuhu, China

Although the relationship between hypertension and hyperuricemia is widely recognized, there is still a relative lack of research on prehypertensive individuals and the individual associations of systolic and diastolic blood pressure with the risk of hyperuricemia. From 2011 to 2016, we conducted a study on 53,323 individuals at Wuhu City Hospital in China. Based on initial blood pressure readings, participants were categorized into normal, prehypertension, or hypertension groups. We used Cox regression to analyze the associations with baseline factors. In subgroup analyses, systolic and diastolic pressures were treated as continuous variables, and their relationship with the risk of hyperuricemia was examined using restricted cubic spline analysis. The risk increased in the prehypertension and hypertension groups compared to the normal blood pressure group, with hazard ratios of 1.192 and 1.350, respectively. For each unit increase in blood pressure, the risk of hyperuricemia rose by 0.8% (systolic) and 0.9% (diastolic), especially when blood pressure levels exceeded 115/78 mmHg. Additionally, we observed that factors such as gender, alcohol consumption habits, obesity, and dyslipidemia might further influence this association. These findings emphasize the importance of early risk assessment and intervention in these patient populations in clinical practice.

Tracking of blood pressure levels from childhood.

The overall goal of this review is to summarize what is currently known regarding the tracking of blood pressure levels from early childhood into later adulthood and to describe the factors contributing to increased hypertension prevalence across the lifespan. This review describes 4 theoretical constructs of blood pressure trajectory across the lifespan: forward development, forward tracking, forward reversal, and maintenance of normal blood pressure levels.

Comparative analysis of machine learning models for predicting PM2.5 concentrations using meteorological and chemical indicators

Air pollution significantly impacts human health, causing numerous premature deaths, particularly with the rise in PM2.5 concentrations. Therefore, comparing different machine learning (ML) models for predicting PM2.5 concentration is crucial. This research focuses on six ML models: Linear Regression (LR), Regression Tree (RT), Support Vector Machine (SVM), Ensemble Regression (ERT), Gaussian Process Regression (GPR), and Artificial Neural Networks (ANN). Trained on six years of data (July 2015–December 2021) with optimized hyperparameters, the models consider eight meteorological and chemical indicators as PM2.5 predictors, including temperature, relative humidity, air pressure, O3, SO2, NO2, dew point, and wind speed. Model efficiency is assessed using Mean Squared Error (MSE), Root Mean Squared Error (RMSE), Correlation Coefficient (R), and Coefficient of Determination (R2) values. The models achieve R2 and RMSE values as follows: LR (0.72, 13.52), RT (0.8, 12.156), SVM (0.82, 10.28), ERT (0.81, 11.87), GPR (0.94, 7.65), and ANN (0.99, 2.36). These metrics indicate the superior performance of ANN, with its R2 value approaching 1 and the lowest RMSE compared to other models. The results highlight the effectiveness of ANN, particularly the model with three hidden layers, in predicting PM2.5 concentration. Utilizing ML models for this purpose is crucial for understanding and mitigating the impacts on human health and the environment, with ANN emerging as a promising tool for various investigations.

Negative triangularity scenarios: from TCV and AUG experiments to DTT predictions

Abstract Experiments, gyrokinetic simulations and transport predictions were performed to investigate if a negative triangularity (NT) L-mode option for the Divertor Tokamak Test (DTT) full-power scenario would perform similarly to the positive triangularity (PT) H-mode reference scenario, avoiding the harmful edge localized modes (ELMs). The simulations show that a beneficial effect of NT coming from the edge/scrape-off layer (SOL) region ρ tor &gt; 0.9 is needed to allow the actual NT L-mode option to perform like the PT H-mode. Dedicated experiments at TCV and AUG, with DTT-like shapes, show an optimistic picture. In TCV, experiments indicate that even with the relatively small triangularity of the DTT NT scenario, a large beneficial effect of NT comes from the plasma edge and SOL, allowing NT L-modes to outperform PT L-modes with the same power input, reaching the same central pressures as PT H-modes with twice as much applied heating power. For AUG, NT plasmas go into H-mode more easily than for TCV, but always present much smaller pedestals compared with PT plasmas with the same input power, showing a much weaker or absent ELM activity. However, NT has a smaller beneficial effect for AUG than for TCV, with NT pulses outperforming PT pulses with the same input power only for an ECRH-only case with relatively low input power. For the considered AUG cases, PT pulses perform better than NT ones at higher ECRH power or with mixed NBI and ECRH power. Based on this analysis, the NT option is a viable alternative for the DTT full power scenario, providing high performance plasmas with reduced or absent ELMs.