Production Sites Research Articles

Physiological plasticity and life history traits affect Chamelea gallina acclimatory responses during a marine heatwave.

The striped venus clam (Chamelea gallina) is a relevant economic resource in the Adriatic Sea. This study explored the physiological status of C. gallina at four sites selected along a gradient from high to low incidence of recorded historical mortality events and low to high productivity in the Northwestern Adriatic Sea. Investigations were performed during the marine heatwave in 2022 (from July to November). The optimal temperature range for C. gallina was exceeded in July and September, exacerbating stress conditions and a poor nutritional status, particularly at the low productivity sites. Transcriptional profiles assessed in digestive glands showed that clams from the low productivity sites up-regulated transcripts related to feeding/digestive functions as a possible compensatory mechanism to withstand adverse environmental conditions. Clams from the high productivity sites, that in a previous study showed enrichment of health-promoting microbiome components, displayed a healthier metabolic makeup (IDH up-regulation) and induction of protective antioxidant and immune responses. These features are hallmarks of putative enhanced resilience of the species towards environmental stress. Despite the well-known high sensitivity of C. gallina to environmental variations and its narrow window of acclimatory potential, results highlight that local conditions may influence physiological plasticity of this clam species and shape either positively or negatively its response capabilities to environmental changes. The identification of health-promoting endogenous mechanisms both from the animal (this study) and from its associated microbiome may provide the foundation for developing novel tools and strategies to improve clam health and production in low productivity areas or under adverse environmental conditions.

Evaluation of dust fixation effect of urease-based biological dust suppressant and its field application.

Widespread mining of open-pit coal mines has led to severe dust pollution, which degrades air quality and affects human health. Due to the drawbacks of existing dust suppression methods, there is an urgent need to develop a biological dust suppressant, which is based on urease-induced carbonate precipitation and has excellent potential for application in the field of dust management. The research developed a biological dust suppressant based on urease-induced carbonate precipitation technology. By using biological dust suppressant with different ureases, the dust suppression effect was determined and field applications were conducted. The optimal formulation of the dust suppressant was identified through experiments, and the evaluation of erosion resistance, calcium carbonate yield, hardness, permeability resistance, and crust thickness was conducted, elucidating the consolidation mechanism. After synthesizing the economic benefits and treatment effects of field use, it was found that the optimal ratios of the dust suppressant were 1.0mol/L for urea and calcium chloride, 100g/L for soybean flour, and the ratio of urease solution and cementing solution was 1:1 when used; the calcium carbonate yield of the specimen treated by EICP (SCU) was as high as 7.49 %. In an alternative phrasing, after undergoing tests for resistance to wind and rain erosion, the mass loss rates were recorded at 0.24gm-2·min-1 and 156.51gm-2·min-1. When compared to the treatment with pure urease, there was a significant improvement in wind erosion resistance by 90 % and in rain erosion resistance by 25.53 %. Field applications have revealed that the distribution of calcium carbonate is uneven and exhibits a positive correlation with hardness, penetration resistance, and the thickness of the crusts formed. This is due to the macromolecular organic matter in crude urease, which not only can form a spatial mesh structure and play a bonding role, but also can provide nucleation sites for urease-induced production of calcium carbonate, promoting the precipitation and aggregation of calcium carbonate, so that the strength is improved.

Geochemical fingerprinting and statistical variation of 35 elements in produced water and rock material from offshore chalk reservoirs

Trace metals and metalloids occur in small quantities in the subsurface water generated from oil wells, called produced water (PW). While these substances are present in low concentrations, PW volumes are sufficiently large that they are still a potential environmental concern. This study has focused on quantifying 71 trace metals and metalloids present in PW from Danish offshore oil production sites. These metals are often a challenge to measure and are globally underreported. By employing optimized sample treatment and ICP-OES and ICP-SFMS methods, the full elemental screening of PW samples collected from various offshore platforms has been carried out with high accuracy. Distinct geochemical signatures involving 35 elements have been discovered and they are associated with significant site-specific variations in the concentrations of key trace metals, including W, Ba, Mo, Cu, and Tl. Utilizing Principal Component Analysis (PCA), the study has effectively distinguished between PW samples from different fields, highlighting the relevance of certain trace metals and elemental ratios as potential geochemical markers. Geochemical analysis of the chalk rock material from the same production wells as the fluid samples has shown a correlation of key elements Tl, W, Cu, Mo, Ba, and As in the chalk with the produced water, indicating the origin of the metals. The study has revealed a high compositional variability of PW and found that elements including Zn, Co, Hg, and Cs occur in concentrations of magnitude higher than previous estimates. In addition, there is high variability in concentrations at different sampling times, underlining the need for environmental monitoring and developing more informed management strategies for the main offshore PW stream. The variability in concentrations in space and time leads to large uncertainties in environmental reporting based on a few samples. The detailed sampling campaign reported here for the first time highlights need for much more frequent sampling, ideally continuous monitoring. The safety of produced water discharge to sea can be significantly underestimated by limited sampling. This paper provides the first field-specific and time varied screening of heavy metals in real produced water and shows the discrepancy in our understanding of the environmental impact of PW.

Cereal aphid species: their natural enemies and efficiency of Lysiphlebus testaceipes (Cresson, 1880) to control Rhopalosiphum maidis (Fitch, 1856)

AbstractCereal grains both for human consumption and animal feed are an essential component of global food systems. However, during production they are often targeted by various pest insects, including aphids. A survey was carried out from 2017 to 2021 in six cereal production sites in Tunisia to evaluate aphid diversity and identify natural enemies on Triticum turgidum subsp. durum (durum wheat), Hordeum vulgare (barley), Avena sativa (oat) and Triticum secale (triticale). Six aphid species belonging to four genera were recorded: Diuraphis noxia, Rhopalosiphum maidis, R. padi, Schizaphis graminum, Sitobion avenae and Sitobion fragariae. Among these, S. avenae and R. padi emerged as the most prevalent species across the majority of sites, infesting durum wheat, barley and triticale. Sc. graminum, R. maidis and D. noxia were less frequent, while S. fragariae was exclusively found on oat plants. Common aphid predators observed included Coccinella algerica, Hippodamia variegata and C. undecimpunctata, as well as syrphid flies such as Episyrphus balteatus and Sphaerophoria rueppellii. Lysiphlebus testaceipes was the sole parasitoid species detected, emerging exclusively from R. padi and R. maidis mummies. Furthermore, the study on the efficacy of L. testaceipes against R. maidis indicated that parasitism levels increased with the number of introduced parasitoid pairs. Aphid and natural enemy diversity were also evaluated.

Podcasting mundane practices of solidarity and resistance in post-migrant Sweden

Sweden is a post-migrant society where the suburbs of the largest cities in Sweden have become the symbol of failed integration in public debate and media. To broaden the representation, young people from the suburbs use podcasting to challenge and present their own perspectives. Based on content analysis and interviews with selected podcasters this article explores how they position themselves in relation to mainstream media and society by focusing on their distinct media practices. The study suggests that these podcasts can be perceived as sites of cultural production where the articulation of mundane practices of solidarity and resistances are central. It is illustrated in the content and the guests they invite; and reflected in how the podcasters articulate their aims and goals, as well as how they position themselves in relation to other actors and spheres.

Automated radiofluorination of HER2 single domain antibody: the road towards the clinical translation of [18F]FB-HER2 sdAb.

With the next generation of Human Epidermal Growth Factor Receptor 2 (HER2) -targeting therapies, such as antibody-drug conjugates, showing benefit in "HER2 low" and even "HER2 ultralow" patients, the need for novel methods to quantify HER2 expression accurately becomes even more important for clinical decision making. A HER2 PET/CT imaging assessment could evaluate HER2 positive disease locations while improving patient care, reducing the need for invasive biopsies. A single-domain antibody (sdAb)-based PET tracer could combine the high specificity of sdAbs with short-lived radionuclides such as fluorine-18 (18F) and gallium-68 (68Ga). SdAb-based PET tracers have clinically been used via a 68Ga-chelator approach. However, the distribution of 68Ga-labelled pharmaceuticals to peripheral PET centres is more challenging to organize due to the short half-life of 68Ga, most certainly when the available activity is limited by a generator. Cyclotron produced 68Ga has removed this limitation. Distribution of 18F-labelled pharmaceuticals remains less challenging due to its slightly longer half-life, and radiofluorination of sdAbs via N-succinimidyl-4-[18F]fluorobenzoate ([18F]SFB) has shown to be a promising strategy for developing sdAb-based PET tracers. Although [18F]SFB automation has been reported, automating protein conjugation proves challenging. Herein we report the fully automated, cartridge-based production of [18F]FB-HER2 sdAb on a single synthesis module. [18F]FB-HER2 sdAb (> 6GBq) was obtained after a fully automated production (95min), with a RCP > 95%, apparent molar activity > 20GBq/µmol and decay-corrected radiochemical yield (RCY d.c.) of 14 ± 2% (n = 4). Further upscaling amounted to production batches of 16GBq with an apparent molar activity > 40GBq/µmol and RCY d.c. of 8 ± 1% (n = 4). Ex vivo biodistribution and PET imaging showed specific HER2-positive tumour targeting and low kidney retention. The [18F]FB-HER2 sdAb tracer was produced with clinically relevant activities using a fully automated production method. The automated production method was designed to ease the translation to the clinic and has the potential to be used not only in mono-centre but also multi-centre clinical trials with one central production site. [18F]FB-HER2 sdAb showed a favourable biodistribution pattern and could be a valuable alternative to 68Ga-labelled sdAb-based PET tracers in the clinic.

Messy natures: The political aesthetics of nature recovery

Abstract Current aspirations for nature recovery to address biodiversity loss and climate change will involve changing what landscapes look like, which can create challenging aesthetic experiences for members of the public. In this study, we interrogate the role of aesthetics in shaping visions of nature recovery, focussing on the construction and contestation of ‘mess’ and ‘messiness’ in nature recovery. We examine the political aesthetics of messy natures using a qualitative approach investigating visual and text materials across different sites of production in Britain, from newspapers to social media, paying particular attention to visual materials Our results show how the mediated debate around ‘rewilding’ urban environments and a beaver‐themed garden winning a horticultural show are examples of a backlash against untidy environments through a politicised discourse, linking messy nature with left‐wing ideologies, in contrast to the perceived orderliness and conservative ideals of good citizenship associated with tidiness. In contrast, social media imagery of messy and wild gardens demonstrates how mess is consciously framed aesthetically as a desirable ‘look’ for restored nature, symbolising progressive and environmentalist ideals of good citizenship through activities such as nature‐friendly gardening and initiatives such as ‘No Mow May’, which celebrate the aesthetic of a more biodiverse messiness. And finally, we traced how environmental advocacy organisations are prefiguring the future of nature recovery in Britain through commissioned graphical representations that portray a ‘tamed messiness’ and the return of charismatic megafauna. Although these aesthetics may challenge prevailing pastoral aesthetics, they normalise continued inequality in the form of concentrated land ownership, especially in the Scottish Highlands. Policy implications. Our analysis shows that aesthetics play an important role in shaping views of what is ‘natural’, ‘normal’ and ‘good’ and therefore desirable in what a future (recovered) nature looks like. We suggest that nature recovery initiatives take aesthetics seriously, by interrogating how idealisations of ‘how nature should look’ may influence decision‐making alongside ecological and other considerations. Taking aesthetics seriously also opens avenues for engaging with social and environmental justice, where alternative aesthetics can help in imagining more socially and environmentally just futures. Read the free Plain Language Summary for this article on the Journal blog.

EKSPLORASI FAKTOR PENGHAMBAT DALAM MENGADOPSI GREEN MARKETING PRACTICES PADA IKM RENDANG DI KOTA PADANG

The purpose of this study is to explore the inhibiting factors in the implementation of green marketing practices in rendang SMEs in Padang City. This study uses a qualitative method that aims to obtain a clear picture of a problem, which will be focused on collecting data or information on the object. The results of the research findings and the results of the NVivo 12 plus Project Map analysis, various obstacles felt by SMEs actors to implement green marketing practices, namely government regulations, resources, organizational management, costs and awareness. This is due to the lack of involvement in long-term environmental concerns when producing products. In general, SMEs in rendang businesses focus more on the taste of food, product durability and good quality to reach consumers. In this case, there is no involvement in environmental aspects to minimize environmental impacts ranging from products, production sites, and price to product promotions.

A prospective approach to the optimal deployment of a hydrogen supply chain for sustainable mobility in island territories: Application to Corsica

This study develops a framework for designing hydrogen supply chains (HSC) in island territories using Mixed Integer Linear Programming (MILP) with a multi-period approach. The framework minimizes system costs, greenhouse gas emissions, and a risk-based index. Corsica is used as a case study, with a Geographic Information System (GIS) identifying hydrogen demand regions and potential sites for production, storage, and distribution. The results provide an optimal HSC configuration for 2050, specifying the size, location, and technology while accounting for techno-economic factors. This work integrates the unique geographical characteristics of islands using a GIS-based approach, incorporates technology readiness levels, and utilizes renewable electricity from neighboring regions. The model proposes decentralized configurations that avoid hydrogen transport between grids, achieving a levelized cost of hydrogen (LCOH) of €8.54/kg. This approach offers insight into future options and incentive mechanisms to support the development of hydrogen economies in isolated territories.

Quantitative Characterization of Compressed Air Systems

In industrial production plants, leaks in the compressed air system (CAS) lead to significant energy losses. In view of rising global energy costs, increasing the efficiency of such systems represents considerable costcutting potential. When analyzing CASs, it is often not possible to quantify the basic consumption and leakages from the available data. For companies seeking to evaluate potential savings and enhance energy efficiency, it is crucial to quantitatively assess the efficiency of CASs in terms of leakage rate. Determining the quality is typically done at a pressure of 1 bar, which is insufficient due to the volume influence of different compressor-units used in production plants. This work focuses on the algorithmic identification of pressure drop intervals as well as the determination and graphical representation of a quantitative trend visualization for industrial pressure drop intervals over a broad pressure range. For the study, the pressures time series of four production sites were recorded within one year. Shutdown periods were identified from the raw data using four machine-learning (ML) clustering and classification methods. By segmenting the pressure drop intervals, the shutdown periods were parameterized, from which quantitative trend visualization for the pressure drop periods due to compressor shutdown could be calculated and interpreted in the context of a graphical representation. The classification methods were compared as part of this work. With an F1-score of up to 0.99 being reached, only the variance differed among the algorithms. From the temporal observation of the calculated trend visualizations, rapidly falling curves suggest an increasing system leakage.

Mercury monitoring in farmed Pacific bluefin tuna (Thunnus orientalis) using liquid asymmetric-electrode plasma optical emission spectroscopy: Ventricle tissue as a potential indicator

Tuna muscle is known to contain high levels of mercury, necessitating the monitoring of mercury concentrations in farmed fish at production sites. There is currently no straightforward in on-site method for testing whether the mercury levels in farmed tuna exceed regulatory limits. This study investigated the potential application of liquid asymmetric-electrode plasma optical emission spectroscopy (LAEP-OES) to estimate mercury concentrations in the tissues of cultured Pacific bluefin tuna at aquaculture farms. No significant differences in mercury concentrations were observed between the ventricle tissue and biopsied tissue from tuna bleeding site (TTBS), which can be harvested without reducing the market value of farmed tuna (Hg concentration of the ventricle tissue and the TTBS, median: 0.41 and 0.40 mg/kg, respectively). In addition, the relationship between mercury concentrations in the ventricle tissue and in the edible portions of three tuna fish was examined. The findings showed that total mercury level in the edible tissues varied, with the ratio of the mercury level in edible tissues to that in the ventricle ranging from 0.39 to 1.08. A positive correlation was observed between the average total mercury levels in edible tissues and ventricle tissue. These results suggest that determining the total mercury level in the ventricle, which is typically discarded at processing sites, may serve as a convenient proxy for quality control and monitoring purposes using the LAEP-OES method. However, larger sample sizes are needed to validate the proposed approach more robustly.

Genome-Wide Analysis of the Serine Carboxypeptidase-like (SCPL) Protein Family of Bitter Gourd and Functional Validation of McSCPL22 in Fusarium oxysporum f. sp. Momordicae (FOM) Resistance.

Bitter gourd is increasingly being recognized for its value as a vegetable and medicinal use, but the molecular mechanisms of pathogen resistance remain relatively poorly understood. The serine carboxypeptidase-like (SCPL) protein family plays a key role in plant growth, pathogen defense, and so on. However, a comprehensive identification and functional characterization of the SCPL gene family has yet to be conducted in bitter melon. In this study, 32 SCPL genes were identified in bitter gourd and divided into three classes. The number of SCPL genes contained in the three clusters was 7, 7, and 18, respectively. Most SCPL gene promoters contain cis-acting elements with light, hormone, and stress responses. The RNA sequencing data showed that the expression of several SCPL genes changed significantly after pathogen infection. In particular, expression of the McSCPL4, 10, 17, 22, and 25 genes increased substantially in the resistant varieties after infection, and their expression levels were higher than those in the susceptible varieties. These results suggested that genes such as McSCPL4, 10, 17, 22, and 25 may play a significant role in conferring resistance to fungal infections. Moreover, the expression levels of the McSCPL10, 17, 22, 23, and 25 genes were likewise significantly changed after being induced by salicylic acid (SA) and jasmonic acid (JA). In situ hybridization showed that McSCPL22 was expressed in the vascular tissues of infected plants, which largely overlapped with the location of Fusarium oxysporum f. sp. Momordicae (FOM) infection and the site of hydrogen peroxide production. Our results showed that McSCPL22 may be involved in the regulation of the SA and JA pathways and enhance resistance to FOM in bitter gourd plants. This is the first study to perform SCPL gene family analysis in bitter gourd. McSCPL22 may have the potential to enhance FOM resistance in bitter gourd, and further investigation into its function is warranted. The results of this study may enhance the yield and molecular breeding of bitter gourd.

Myocardial cell mitochondria-targeted mesoporous polydopamine nanoparticles eliminate inflammatory damage in cardiovascular disease

Excess reactive oxide species (ROS) is a direct factor in myocardial injury death, thus anti-oxidant therapy is a necessary measure to prevent rapid death of cardiomyocyte cell. Cysteine (Cys) is a potent antioxidant but easily become instability because of the hyperactivity. Therefore, in order to protect the the stability of Cys, we according to the mitochondria are the main sites of ROS production, utilized the loading and ROS scavenging capacity of mesoporous polydopamine (mPDA) constructed a nanosystem targeting mitochondria with effectively ROS elimination capability by loading cysteine (Cys-mPDA@TPP). The mesoporous structure of mPDA effectively inhibited the advance reaction and hyperactivity of Cys, thus effectively improving its stability that reached the double-collaborative treatment excess ROS. In particular, Cys-mPDA@TPP achieved directly reacting with ROS in mitochondria under the targeting of triphenylphosphine (TPP), not only enhancing the elimination efficiency of ROS, but also preventing mitochondrial dysfunction of monocyte-macrophage. Furthermore, with double-collaborative ROS elimination, Cys-mPDA@TPP effectively prevent the damage of cardiomyocyte cell through inhibiting macrophage inflammatory response. Therefore, this study provides a new therapeutic strategy for myocardial inflammatory injury.

Emerging contaminants removal through fluorine-doped carbon hollow fiber microfiltration membrane based on metal-free electro-Fenton

The emerging contaminants with high toxicity and bioaccumulation potentially threaten to human health, which was difficult removed by traditional biological treatment or membrane separation. In view of this, a novel type of fluorine (F)-doped carbon hollow fiber microfiltration membrane was prepared for realizing emerging contaminants removal through metal-free electro-Fenton. Herein, polyaniline (PANI) was used as a precursor for preparation of porous carbon membrane. The graphitic N and pyridinic N on porous carbon were used as the active sites for H2O2 production and its further activation to ·OH, which realized metal-free electro-Fenton reaction. According to the results, the carbon nanotubes with F-PANI at the ratio of 1:1 and calcination temperature at 300°C endowed the membrane moderate resistance and pure water permeability of 430 Ω and 48.51 L/(m2·h·bar), respectively. Importantly, the intensity of ·OH generation was further significant enhanced by introducing C-F bonding into the membrane. Therefore, the bisphenol A (BPA), sulfamethoxazole (SMZ) and atrazine (ATZ) removal rates were 92.63%, 38.47% and 27.05%, respectively. For control group without bias, the removal rates of above contaminants were 0% removal rates. Moreover, the membrane permeate loss by filtrating BPA, SMZ and ATZ were 0.13, 0.15 and 0.05, which were 0.20, 0.24 and 0.21 for control group.

Addressing Low-Cost Methane Sensor Calibration Shortcomings with Machine Learning

Quantifying methane emissions is essential for meeting near-term climate goals and is typically carried out using methane concentrations measured downwind of the source. One major source of methane that is important to observe and promptly remediate is fugitive emissions from oil and gas production sites but installing methane sensors at the thousands of sites within a production basin is expensive. In recent years, relatively inexpensive metal oxide sensors have been used to measure methane concentrations at production sites. Current methods used to calibrate metal oxide sensors have been shown to have significant shortcomings, resulting in limited confidence in methane concentrations generated by these sensors. To address this, we investigate using machine learning (ML) to generate a model that converts metal oxide sensor output to methane mixing ratios. To generate test data, two metal oxide sensors, TGS2600 and TGS2611, were collocated with a trace methane analyzer downwind of controlled methane releases. Over the duration of the measurements, the trace gas analyzer’s average methane mixing ratio was 2.40 ppm with a maximum of 147.6 ppm. The average calculated methane mixing ratios for the TGS2600 and TGS2611 using the ML algorithm were 2.42 ppm and 2.40 ppm, with maximum values of 117.5 ppm and 106.3 ppm, respectively. A comparison of histograms generated using the analyzer and metal oxide sensors mixing ratios shows overlap coefficients of 0.95 and 0.94 for the TGS2600 and TGS2611, respectively. Overall, our results showed there was a good agreement between the ML-derived metal oxide sensors’ mixing ratios and those generated using the more accurate trace gas analyzer. This suggests that the response of lower-cost sensors calibrated using ML could be used to generate mixing ratios with precision and accuracy comparable to higher priced trace methane analyzers. This would improve confidence in low-cost sensors’ response, reduce the cost of sensor deployment, and allow for timely and accurate tracking of methane emissions.

Digital Arrival Infrastructures: Housing Platforms and Residency Governance in Berlin’s Rental Sector

This article explores how notions of formality and informality in housing are produced in relation to digital infrastructure and localized bordering regimes. Drawing on a research diary project conducted with “International” migrants in Berlin, Germany, I draw on scholarship in Digital Geography and Migration Studies to frame digital platforms as “arrival infrastructures,” which allow “Internationals” to negotiate the legal process of becoming formally resident in the city. Rather than entry into the long-term “formal,” rental sector, the opportunity to codify residency status becomes the decisive factor in determining housing choices. It also determines the type of housing platforms which are used to seek accommodation in the city and influences digital behavior. My contribution in this article is twofold. Firstly, I advance an understanding of housing in/formality as a concept which is formed according to one’s own positionality in relation to State mobility regimes. Secondly, I describe how the interface of platform-mediated rental sites becomes a site of knowledge production about norms and behavior within an unfamiliar housing system. This is accomplished through the proposal of a typology which classifies platform services according to the ways in which they used to negotiate residency governance regimes: large and long-term housing platforms; “medium-term” platform-mediated rentals; platforms rented and shared; and supplementary tools. I conclude by highlighting the need for further research into the role of rental platforms as a bordering technology, especially in the European context.

Co-pyrolyzed biochar derived from microplastics and microalgae as peroxymonosulfate activator: Influence of microplastic types and analysis of systemic causes

This work investigated the catalytic activity of co-pyrolyzed biochar (MP-SBC) from microplastic (MP) and Spirulina biomass and its activation mechanism for peroxymonosulfate (PMS). Given that different types of MPs had varied effects on the properties of biochar, polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), and polylactic acid (PLA) were chosen as MP feedstocks. The results showed that the four kinds of MP-SBCs activated PMS more efficiently than the pristine algal-based biochar (SBC), with 100 % of the acetaminophen (ACT) degraded within 20 min. Based on the reaction mechanism analysis, the main pathways for the degradation of ACT by SBC and MP-SBC activated PMS were both non-radical pathways, and ACT was also efficiently degraded by the synergistic effect of 1O2 and electron transport pathway (ETP). Moreover, it was found that the microplastic modification could significantly enhance the efficacy of SBCs in triggering the non-radical pathway. Establishing the correlation between the structural features of BC and the degradation mechanism (active species contribution) revealed that the persistent free radicals (PFRs), defective structures, CO, and graphite N are all potential active sites. Thereinto, PFRs are the active sites for radicals, defects are the active sites for 1O2 production, and CO, defects, and graphitic N are the active sites for ETP. Overall, this work provides an innovative approach for designing efficient biochar-based catalysts for environmental remediation.

Composing Time in a Secondary U.S. Classroom: (Not) Challenging Ideological Polarization through Straight and Queer Temporal Movements

Drawing on a larger year-long ethnography at a public, urban, comprehensive high school in the Midwestern United States, this article describes the texts students composed in a co-taught sophomore (grade 10) humanities course combining social studies and English language arts. Bringing together sociocultural perspectives on literacy and composition with queer theorizations of time, I argue for the utility of attending not only to time’s multi dimensionality but also its multi directionality. Doing so in writing instruction can help thaw binary polarization and foster more humanizing temporal and in turn ideological movements. To illustrate, I present an ethnographic case of students writing about the history of gendered clothing in 20th-century U.S. society. I examine how different temporal ideologies had consequences for students (not) reproducing antagonistic, polarized binaries with respect to oppressive values, in particular anti-LGBTQIA+ values as they intersect with class, race, and politics. Although my emphasis is how gender and sexuality intertwine with economics, race, and politics, this article suggests that attending to the multidimensionality and multidirectionality of time is a productive site for scholars and educators committed to praxes of justice in writing instruction.

Теплоотдача при движении воды в трубе при температурах, близких к температурам кипения в переходном режиме

Currently, there is a problem of developing effective methods to calculate heat and mass transfer processes during steam condensation from a vapor-gas mixture in industrial devices. This is due to the need to create new reliable and highly efficient designs of heat exchangers for various purposes. The finite element method has been used in the ANSYS Fluent software package during the numerical simulation. An experimental plant is tested in the pipeline of an industrial enterprise at the production site of the Technopolis KHIMGRAD industrial park (Kazan-city). The applicability of the Lee model to solve problems of water flow in a pipeline with partial evaporation is proved. This model allows you to accurately account for the processes of evaporation and condensation, which is important for the design of cooling and air conditioning systems. The authors have designed a three-dimensional model of the flow area of the experimental module and a CFD model to calculate temperatures, phase velocities and their concentrations, considering the peculiarities of the ongoing processes of heat and mass transfer. A slight effect on the heat flow of a 180° rotation during the flow of a liquid medium in the range of the Reynolds numbers 1800–2600 is shown. The developed model is verified with the results obtained at the experimental plant. It is established that the model reproduces experimental data well. An analysis of studies of heat and mass transfer processes during the fluid flow in channels in the presence of phase transitions is carried out. The problems of calculating the parameters of heat transfer during the movement of a fluid in a transient mode are revealed, especially at values of the Reynolds number close to 2000. The experimental plant diagram is presented. It is found that in the range of Reynolds numbers of 2600–3600, the calculated temperature values differ from the temperature values obtained experimentally by less than 0,42 %. During the partial transition of water into steam in the range of Reynolds numbers of 1800–2600, the deviations were less than 6 %, which confirms the adequacy of numerical modeling of calculating the heat transfer process in a pipe. It is shown that considering the influence of temperature on surface tension, the coefficient of thermal conductivity of water and the coefficient of dynamic viscosity of water is important to obtain accurate results. The proposed approach can be used to optimize the operating parameters of condensers and evaporators, as well as to accurately calculate the heat transfer coefficient and determine the areas of vapor formation. It will improve the energy efficiency of industrial installations and reduce the cost of equipment operation.

청양지역으로 본 백제 가마의 운영과 의미

Evidence has confirmed the existence of kiln sites that produced a variety of objects in the Cheongyang area over different periods. They are so large in numbers that they account for approximately 42% of the entire relics. There were especially many kiln sites built in the Cheongyang area because of its geographical conditions necessary for production and its historical context close to the capital city. All of the Baekje kiln sites were built in “Yeolgi-hyeon” and supplied necessary objects to the capital cities of Woongjin~Sabi. The kiln sites of Hagam-ri made and provided ceremonial pottery needed in the capital cities. Those of Gwanhyeon-ri and Wangjin-ri made and supplied roof-tiles representing each group. Those of Bonui-ri were characteristic in that they produced pedestals for Buddha statues. The Baekje kiln sites in the Cheongyang area were managed in three major ways including the production of roof-tiles along with pottery, the changing supply-demand relations, and the intentional transformation of roof-end tiles patterns. They were the results of flexible responses to roof-tiles demand in the composition and moving of the production group and the efficiency of kiln operation. Baekje built kiln sites in the Cheongyang area because the capital city lacked the conditions to build a production relic. The mountains around the capital city had tombs and fortresses built, and it was important to minimize the fire risk of the major buildings within the capital city walls. The opposite side of the Geumgang-River was thus highlighted as an important production site, and the Cheongyang area followed this historical context.