Material Conditions Research Articles

‘Data saves lives’: Ideational-material drivers of health data journeys in the UK

In this paper, we bring together the concepts of data valences and data journeys to examine how ideational and material factors work together to shape the movement of health data from the UK healthcare sector to universities for reuse in research. Specifically, we focus on the interaction of university-based researchers’ constructs about data with the material conditions of health data circulation in the UK and how these dynamics drive greater circulation of health data through the data sharing infrastructure. Building on our empirical research, we identify four data valences or expectations about data present in the discourses of university-based researchers – vanguard, discovery, truthiness and actionability – and three material factors – investment in data, infrastructure and labour. We argue that the interaction of these factors has created a favourable environment for making data flow from the healthcare sector into the hands of university-based researchers. This work contributes to a better understanding of why health data reuse practices are expanding and being sustained, and it challenges previous health data reuse research that treats the drivers shaping data flows as self-evident or already determined.

Creation of Stem-Centers Within Experimental Activities (Best Practices)

The article is devoted to the analysis of the organization of the creation of STEM centers as innovative educational environments aimed at the formation and development of STEM competencies and creative activity of education seekers, the development of innovative models of education and the professional improvement of pedagogical workers in the STEM direction. It was found that the organization of the creation of STEM centers requires the provision of organizational, scientific-methodical, material and technical conditions and personnel support. It was determined that the organizational conditions include the development and adoption of the necessary regulatory documents that determine the principles of STEM-centers' activities. The scientific and methodological conditions provide for the development and adaptation of educational programs and educational and methodological materials, lesson plans and manuals focused on the integration of STEM disciplines. Material and technical conditions provide for the availability of modern equipment, computer classes, laboratories, workshops, software and other technical means and resources. Staffing requires the involvement of qualified teachers, trainers, instructors, methodologists, specialists in STEM disciplines. The study is aimed at studying the best practices of creating STEM centers within the framework of the implementation of an innovative educational project at the all-Ukrainian level on the topic "Organizational and scientific-methodical conditions for the creation of STEM centers" in 2022-2027. The author of the article provided practical recommendations for organizing the creation of STEM centers, taking into account the results of the survey of basic educational institutions of the innovative educational project and the needs of modern education.

Put at and kept from risk: The sexual risk dilemmas confronting marginalized youth.

The current study examines Bay-Cheng and Ginn's (2024) claim that marginalized youth confront two intertwined sexual risk dilemmas: being put at risk by unjust social forces and structures that threaten their sexual health and safety; and being kept from risk by those same forces and structures, thus compromising their development and dignity. We explored the presence and relevance of these dilemmas using interviews conducted in 2022 with 101 racialized and/or queer (i.e., a sexuality other than exclusively heterosexual) young women and trans or nonbinary youth aged 16-21 and living in Melbourne (Australia), New York City (United States), and Toronto (Canada). We conducted a directed content analysis of the data and examined intersectional group-based comparisons of code frequencies. We found that 80% of participants felt endangered (i.e., put at risk) and/or obstructed (i.e., kept from risk) by social and material conditions. Over half felt put at risk through exposure to hostility and harm, and over one-third of participants described precarious life circumstances as keeping them from taking wanted sexual risks. Group-based and intersectional comparisons indicated that feeling put at risk is associated with marginalized gender and sexuality identities and corresponding discrimination. We also found tentative signs that feeling kept from risk may be more closely linked to race and racism than marginalization by gender and/or sexuality. The findings highlight the diverse implications of interlocked social injustices for youths' sexual lives, particularly the infringement on their rights both to safety and to risk.

Structural Material Condition Assessment through Human-in-the-Loop Incremental Semisupervised Learning from Hyperspectral Images

Structural Material Condition Assessment through Human-in-the-Loop Incremental Semisupervised Learning from Hyperspectral Images

Particulate fouling simulation in unit micropore using a hydrodynamically coupled Lagrangian framework

Predicting and mitigating pore clogging is challenging for the sustainable operation of water treatment systems. During transport and filtration through membrane micropores, buoyant contaminants in water gradually deposit on the surface, reducing the membrane's lifespan and performance, and sometimes completely blocking the pores. To alleviate the negative effects of fouling and to ensure sustainable operation, it is necessary to understand the fundamental mechanisms of fouling and to predict the probability of fouling formation under specific geometrical and material conditions. In this study, multiscale simulations are conducted to understand the fundamental mechanisms of particulate fouling at a microscopic level based on a Lagrangian framework incorporating inter-particle hydrodynamic interactions. We investigate both dead-end and cross-flow filtration, considering the direction of the feed stream relative to the unit micropore. The results elucidate the quantitative background of fouling history, which agrees with experimental findings. Depending on the level of hydrodynamic stress specific to the clog location and the nature of inter-particle interactions, deformation or resuspension of the clog is observed, competing with deposition, which leads to a two-way fouling history. Dominant deposition leads to micropore clogging, and to the best of the authors' knowledge, this is the first study to observe complete blockage and subsequent reopening. With this approach, the microscopic backgrounds between permanent and temporary pore blocking are distinguished. This study is expected to provide useful insights for controlling operational conditions to optimize anti-fouling performance in the transport and filtration through micropores.

Posting the nation: Australia’s apprenticeship in letter writing

A national postal service is an essential nation-building institution; it integrates distant regions into a national community and fosters the extension of the public sphere. But in the first decades of colonial Australia, the material conditions of sending letters were precarious and uncertain, the rhythm of exchange was slow and the cost expensive. Australia had to learn how to write letters and how to send them; by the 1890s, it had completed its apprenticeship. Using postmaster-generals’ reports on one hand, and autobiographical sources on the other, I explore the experience and difficulties of epistolary exchanges in the nineteenth century.

Anti-Pastoral and the Prophetic Mode in Moddi’s Climate Songs

This article explores aspects of apocalypse and pastoral in the climate themed song lyrics of Norwegian indie folk artist Moddi. Through close listening and contextualizing of the songs “Noens ark” (“Someone’s ark”, 2013) and “En sang om fly” (“A song about planes”, 2013), apocalypse and pastoral emerge as key motifs. These are navigated in an exploration of a conflicted Norwegian response to global warming. The songs express critique of unrelenting pursuits of economic growth and personal consumption even as the future imposes itself on the present. In two different ways, elements of indie folk music are tailored to express an ontologically unsettling encounter with a global environmental risk scenario. “Noens ark” employs forceful instrumentation and polyrhythms to evoke a sense of alarm and urgency called for by the projection of future disaster. “En sang om fly” is a soft composition projecting nostalgia for the material conditions of the present. The desire for these conditions ultimately locks the singer in a cycle of repetition that destabilizes the very conditions he desires. The nuances afforded by this expression in musical performance allows song lyrics to sustain contradictory attitudes towards globalization. In their pursuit of these contradictions, Moddi’s climate songs can be seen as part of an anti-pastoral tradition. Features of musical genre and a prophetic lyric mode are employed to evoke and subvert a pastoral response to apocalypticism. By musically sustaining contradictions between pastoral and apocalypse, Moddi’s songs reflect a conflict between Norwegian identity and a global cultural imaginary in the face of global warming.

Comfort of Wrist-Worn Devices: Development of an Assessment Tool and Measurement of Comfort-Discomfort Pressure for Older and Younger Users

Wrist-worn devices hold significant potential for health monitoring, particularly for older people. However, the adoption and continuous usage of these devices are heavily affected by wearing comfort. Currently, there is still a lack of validated assessment tools specifically developed to evaluate the comfort of such devices. Additionally, while pressure is critical for both proper device placement and maintaining comfort, quantitative references for suitbale pressure levels are scarce. Moreover, the impact of age difference on comfort perceptions have been largely overlooked. To address these gaps, we conducted two experiments involving 18 older and 18 younger participants. In Experiment 1, we gathered comfort evaluations from participants while wearing the devices in both home/office and exercise scenarios. In Experiment 2, we focused on pressure, measuring the pressure on participants’ wrists under three strap material conditions and collecting their corresponding comfort evaluations. The results established three dimensions of comfort: movement comfort, thermophysiological comfort, and contact comfort, with their relative importance varying by age and use scenario. Also, we identified comfort-discomfort pressure ranges for both age groups, highlighting the influence of strap material and age on comfort perceptions. These findings offer valuable design guidance for manufacturers and enhance understanding of wrist-mounted device comfort.

Mandan Dandies: Trade, Intimacy and Ornamental Excess in a Destroyed 1832 Portrait by George Catlin

Abstract This essay considers the role played by economics and sexuality in the development of the imaginary of US settler colonialism by considering George Catlin’s destroyed 1832 portrait of an anonymous Mandan ‘dandy’. Catlin’s representation of Indigenous dandies likely informed Charles Baudelaire’s account of the dandy as an avatar of the transition to modernity, but during the gay and Indigenous liberation movements of the 1970s, the Mandan dandy was reclaimed as evidence of pre-colonial queer sexualities. Synthesising these conceptions, the essay argues that this figure illuminates the material conditions of modernity in the fur trade: an unstable assemblage of contradictory Indigenous and Euro-American systems of economic exchange, political power and sexual intimacy. The dandy figures a form of queerness that was conceived as an effect of these socioeconomic conditions, which Catlin condemned as perverse: a queerness that lay at the foundations of settler colonialism rather than in opposition to it.

Working in precarity: examining mainstream discourses about street hawking in Ghana

Abstract This study sought to analyze how the media and the general public position street hawking in an economic environment typically constrained by neoliberal orthodoxy. We conducted a critical textual analysis of news articles, op-eds, and video clips from some of the most popular news media sources in Ghana and found that while informal work is often done in turbulent material conditions, marginality and precarity of street hawking are exacerbated by media and popular discourses that are anchored by neoliberalism. We also found that such discourses are resisted by counter-discourses. The study challenges neoliberal analyses of work and labor by explicating the tensions between the attraction to neoliberalism and the reality of its failures for informal work.

Evaluation of static bending caused damage of glass-fiber composite structure using terahertz inspection

Abstract Composite materials find increasing applications in modern industry and transport. However, they may lose desirable mechanical properties due to external mechanical excitations, ultraviolet radiation, moisture penetration, or other factors. Therefore, an effective way to assess the condition of materials is necessary. In this article, a nondestructive evaluation of glass fiber-reinforced composite subjected to five-stage static bending is presented. For this reason, pulsed excitation terahertz imaging was utilized, and a data processing/exploration scheme was proposed. The proposed, novel approach consists of an efficient data registration algorithm based on surface approximation (for surface roughness and unevenness elimination) and a parametrization scheme applied for the signals gained from the time response of the glass fiber-reinforced polymer layer. Obtained parameters enable the global description of the evaluated material state and prediction of failure effectively, even in the early stages of destruction.

The City, the Neighborhood, and the Street: Toward a Global Urban Labor History?

Abstract Labor scholars have increasingly recognized the need to look beyond the workplace and explore where and how workers lived, socialized, shopped, or protested. The six books reviewed in this essay contribute to understanding how modern cities shaped the process of working-class formation as well as workers’ identity, experiences, and economic and material conditions. From different standpoints, these urban and labor histories of Paris, Mexico City, Miami, Port Said, Montevideo, and Santiago, Chile, demonstrate the impact of urban modernization, industrial capitalism, and migration on working families. By bringing together books from different regions and historiographical traditions, this essay also reflects on the possibilities and challenges of writing a global labor urban history.

Iron Age Fur Skin Tanning – a Sustainable Practice?

Tanning is among the most polluting industries in the world. Industrial-produced hides and skins are fully or pre-tanned with highly polluting chromium salts. The purpose of the study was to gain new knowledge about Iron Age tanning methods to clarify whether sustainable tanning methods can be developed based on this. Fur skin capes, uncovered in Jutland bogs, from Baunsø Mose (20-220 AD), Borremose I (365-116 BC), Huldremose I (1-174 AD) and Vindum Mose (386-203 BC) were analysed by Attenuated Total Reflection-Fourier Transform Infrared Spectroscopy (ATR-FTIR), Gas Chromatography-Mass Spectrometry (GC-MS) and morphological assessment of the skin fibres to identify tanning substances and material condition. Analyses were supplemented with source studies of previous visual assessment of the capes and measured shrinkage temperature of leather and skins excavated from bogs. Our results show that only the samples from Baunsø Mose, Borremose I and Huldremose I contain vegetable tannins. Furthermore, Baunsø Mose contains cow fat and Borremose I, Huldremose I and Vindum sheep fat. All contain indications of the presence of aluminum and iron compounds. The samples are decomposed to varying extents. Remnants from conservation were detected on Huldremose I, Baunsø Mose and Vindum Mose.

Parametric structure optimization of a main rotor blade as an application for FSI analysis in main rotor optimization process

Purpose Modern warfare and modern battlefield are very demanding. The recent conflicts showed that the usage of the helicopters is very limited and only the best constructions are able to provide support for the operations. The purpose of this research is to show the possibilities of new design tool for main rotor aerostructural optimization. It is a next chapter of the research that is aimed at finding new solutions for rotorcraft constructions. Design/methodology/approach This work presents a method of preliminary structure optimization of the main rotor blade using parametric modeling. It is the next step in the main rotor optimization studies. It is the next step after preparing the parametric model for the external shape CFD analysis. As a basis for parametric blade structure calculations, the analytical model is provided in this paper. The equations of rigid blade loads and, as a consequence of the strength elements, stresses are shown. The parametric blade modeling is conducted using the Graphic Integrated Programming language. The parametric design method is shown to be used for various blade planform models and different section airfoils. The structure of a blade is generated automatically after the user enters the parameters. The code-inbuilt analysis systems provide a quick inertia examination of the generated geometry, which is the basis for further optimization. The program calculates the blade loads and verifies them with the given material conditions and proposed safety factors. In the analysis, composite materials for the strength elements were proposed. Findings The results of this research showed the application of parametrization into the main rotor blade design loop. It was presented that the main rotor blade structure can be enhanced using fluid-structure interaction (FSI) methods. The time saving with the implementation the process into design loop is shown. Practical implications This work can be practically used in the main rotor blade design process. It provides the possibilities to check various blade aerodynamic configuration in a structure strength aspect. Originality/value To the best of the authors’ knowledge, there were no published research that combines the main rotor FSI analysis. The method, which is presented in the work, provides a new approach to a rotorcraft design. The application of the parametrization and combining it with the FSI method gives a novel solution for helicopters construction enhancement.

Distribution characteristics of photoassimilates in walnut leaves to different organs

The understanding of photoassimilate distribution serves as the fundamental basis for scientific regulation of fruit quality. Currently, there is a scarcity of research on whole-plant scale photoassimilate distribution in walnut. In order to clarify the characteristics of leaf photoassimilates translocation to various organs in 5-year-old 'Wen185' (J. regia 'Wen185') walnut during the growing season, this study used the 13C isotope pulse labeling technique to label the whole plant of walnut trees in the growing season, temporal variations of 13C abundance (δ13C), 13C partition rate (R13C), leaf source strength and fruit sink strength were analyzed in various organs at different days after tree flowering. The findings indicated that during the periods of 30–70 days and 90–110 days after flowering, there was a higher distribution of 13C in fruits and vegetative branches. However, at 110–130 days after flowering, the predominant allocation of 13C shifted towards main trunk and roots. In-depth study of source leaves and sink fruits showed that chlorophyll content in leaves increased significantly 30–50 days after anthesis, indicating that they gradually became mature functional leaves. The increase of net photosynthetic rate led to increase of source strength, and the retention of photoassimilates in leaves was higher at this time. From 30 to 70 days after flowering, the fresh weight and volume of fruit increased rapidly, which increased the capacity of the sink and enhanced the competition ability against photoassimilates. The recovery of photosynthetic capacity of leaves from 90 to 110 days promoted the output of photoassimilates. At this time, walnut entered the oil conversion period, and the demand for photoassimilates increased. All these factors jointly promoted the unloading of photoassimilates in fruit. In summary, maintaining adequate material conditions and optimizing tree structure at 30-70d and 90-110d after anthesis are important for more efficient distribution of photoassimilates to fruit.

Bioactive compounds delivery and bioavailability in structured edible oils systems.

The health benefits of bioactive compounds are dependent on the amount of intake as well as on the amount of these compounds that become bioavailable and bioaccessible. Various systems have been developed to deliver and increase the bioaccessibility of bioactive compounds. This review explores the impact of gelled (oleogels, bigels, emulgels, emulsions, hydrogels, and hydrogel beads), micro-(gels, particles, spheres, capsules, emulsions, and solid lipid microparticles) and nanoencapsulated systems (nanoparticles, solid lipid nanoparticles, nanostructured lipid carriers, nanoemulsions, liposomes, and nanoliposomes) on the digestibility and bioavailability of lipophilic and hydrophilic bioactives. Structurant molecules, the oil type, antioxidants, emulsifiers, and coatings in delivery systems with promising potential in food applications are critically discussed. The release and bio-accessibility of bioactive compounds in gelled systems are influenced by various factors, such as the type and concentration of gelators, the gelator-to-oil ratio, the type of antioxidant, the network of the system, and its hydrophobicity. The stability, bioaccessibility, and controlled release of bioactives were improved in structured emulsions. Several variables, including wall material, oil/water ratios, encapsulation process, and pH conditions, can affect the bioactives release in microencapsulated systems. Factors like coating type and core-to-wall ratio impact the stability and release of core components. The encapsulating material, the encapsulation technology, and the nature of the nanomaterials all have an impact on the bioaccessibility of nanoencapsulated systems. Nanoliposomes provide enhanced stability and absorption. In general, all encapsulated systems have shown great potential in improving the distribution and availability of bioactive compounds.

Developing A Digital Twin of a TRUEX Extraction Process that Enables Non-proliferation and Safeguards Monitoring through Optical Spectroscopy and Machine Learning

Background The recycling of spent fuel can increase the longevity and decrease the waste footprint associated with the nuclear fuel cycle. However, nuclear fuel reprocessing introduces the risk of proliferation of fissile material. For example, the recycling of uranium (U) and plutonium (Pu) is generally accomplished via a solvent extraction process. The separation efficiency of the process is dependent on a variety of parameters such as acid concentration, organic to aqueous (O/A) volume ratio, number of separation stages, etc. A change in any of these parameters could result in different extraction conditions of fissile material and lead to a process upset with potential safeguards and proliferation concerns. Thus, the ability to monitor the solvent extraction process in real-time would enable the rapid identification and diagnosis of process upsets. Methods In this work, we discuss the development of a digital twin of a surrogate small-scale nuclear fuel reprocessing solvent extraction process utilizing online optical spectroscopic monitoring, machine learning (ML), and chemical modeling. A cascade of centrifugal contactors was employed with the TRUEX (TransUranic Extraction) solvent and surrogate minor actinides. Spectroscopic sensors were placed at strategic locations within the contactor bank and were used to predict TRUEX surrogate analyte concentrations at those locations. Results A solvent extraction digital twin consisting of the data acquisition, chemical model, and anomaly detection, provided expected concentrations at each contactor during normal operations. The digital twin demonstrated the ability to accurately simulate the extraction behavior under ideal conditions. Furthermore, the digital twin’s ML anomaly detection algorithm was shown to be successful in identifying several non-ideal process upset conditions.

Cultivated Land Information Extraction and Spatial Pattern Analysis in Beijing Based on Deep Learning

Abstract. Cultivated land is the basic resource and material condition for human survival, providing the necessary material basis for agricultural development and agricultural modernization (Tian and Shi, 2024). For this reason, this paper takes Beijing as an experimental area to study the cultivated land extraction method and analyze the distribution pattern of cultivated land and the degree of fragmentation. The results show that (1) the extraction results are evaluated by using confusion matrix and Kappa coefficient, and the Kappa coefficient is obtained to be 0.8358.(2) The cultivated land in Beijing is mainly distributed in the southeast as well as the northwest of the local area of gentle terrain, and the The range of the extremely high value of cultivated land kernel density in 2017–2022 is significantly reduced, the slope of the area with the smallest reduction in the proportion of cultivated land is less than 5°, the reduction in the area of cultivated land in water resource-rich areas is small, and the reduction in the proportion of cultivated land in road-intensive areas is large. (3) Due to various natural factors and human activities, the degree of cultivated land fragmentation in Beijing is increasing, the boundary shape of cultivated land patches tends to be irregular.

Synergetic effect of in-situ TiB2 reinforcement and nano precipitation on wear behavior of ZE41 magnesium matrix composite

The rise in carbon dioxide pollution and energy consumption has increased the demand for lightweight materials such as magnesium in automotive and aerospace industries. However, magnesium alloys face challenges like poor wear resistance and mechanical strength. To overcome these limitations, a promising approach involves developing heterogeneous hybrid microstructures through reinforcement addition and microstructural engineering. This study focuses on the tribological performance of a newly developed in-situ sub-micron sized TiB2/ZE41 composite under various microstructural conditions, comparing it to the unreinforced ZE41 Mg alloy. Wear experiments were conducted using a pin-on-disc tribometer under normal loads of 10, 20, 40, and 60 N at a sliding velocity of 1 m/s. Scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) was used to analyze the worn surfaces in order to identify damage types and surface distortions. By correlating worn surface microstructures with test parameters, predominant wear mechanisms for each material condition under specific loads were determined. Results consistently showed that the presence of in-situ TiB2 reinforcements, β-phase, and rare-earth precipitates enhanced wear resistance regardless of the load conditions. Additionally, the study established a scientific understanding of the wear behavior of ZE41 Mg alloy, with and without in-situ TiB2 particles and precipitates, through analysis of dominant wear mechanisms, wear-induced subsurface deformation mechanisms, kernel average misorientation, grain orientation spread, and microhardness evaluation.

Social epidemiology of urban COVID-19 inequalities in Latin America and Canada

BackgroundThe COVID-19 pandemic has spread through pre-existing fault lines in societies, deepening structural barriers faced by precarious workers, low-income populations, and racialized communities in lower income sub-city units. Many studies have quantified the magnitude of inequalities in COVID-19 distribution within cities, but few have taken an international comparative approach to draw inferences on the ways urban epidemics are shaped by social determinants of health.MethodsGuided by critical epidemiology, this study quantifies sub-city unit-level COVID-19 inequalities across eight of the largest metropolitan areas of Latin America and Canada. Leveraging new open-data sources, we use concentration indices to quantify income- and vulnerability-related inequalities in incidence, test positivity, and deaths over the first 125 weeks of the pandemic between January 2020 and May 2022.ResultsOur findings demonstrate that incidence, deaths, and test positivity are all less concentrated in low-income sub-city units than would be expected, with incidence ranging concentration in lower income neighbourhoods in Toronto (CI = -0.07) to concentration in higher income neighbourhoods in Mexico City (CI = 0.33). Drawing on relevant studies and evaluations of data reliability, we conclude that the best available public surveillance data for the largest cities in Latin America are likely not reliable measures of the true COVID-19 disease burden. We also identify recurring trends in the evolution of inequalities across most cities, concluding that higher income sub-city units were frequent early epicentres of COVID-19 transmission across the Latin America and Canada.ConclusionsJust as critical epidemiology points to individuals biologically embodying the material and social conditions in which we live, it may be just as useful to think of cities reifying their material and social inequities in the form of sub-city unit-level infectious disease inequities. By shifting away from a typical vulnerability-based social determinants of health frame, policymakers could act to redress and reduce externalities stemming from sub-city unit-level income inequality through redistributive and equity-promoting policies to shift the centre of gravity of urban health inequalities before the next infectious disease epidemic occurs.