Wall Protection Research Articles

The ER Protein Translocation Channel Subunit Sbh1 Controls Virulence of Cryptococcus neoformans.

The fungal pathogen Cryptococcus neoformans is distinguished by a cell-wall-anchored polysaccharide capsule that is critical for virulence. Biogenesis of both cell wall and capsule relies on the secretory pathway. Protein secretion begins with polypeptide translocation across the endoplasmic reticulum (ER) membrane through a highly conserved channel formed by three proteins: Sec61, Sbh1, and Sss1. Sbh1, the most divergent, contains multiple phosphorylation sites, which may allow it to regulate entry into the secretory pathway in a species- and protein-specific manner. Absence of SBH1 causes a cell-wall defect in both Saccharomyces cerevisiae and C. neoformans, although other phenotypes differ. Notably, proteomic analysis showed that when cryptococci are grown in conditions that mimic aspects of the mammalian host environment (tissue culture medium, 37°C, 5% CO2), a set of secretory and transmembrane proteins is upregulated in wild-type, but not in Δsbh1 mutant cells. The Sbh1-dependent proteins show specific features of their ER targeting sequences that likely cause them to transit less efficiently into the secretory pathway. Many also act in cell-wall biogenesis, while several are known virulence factors. Consistent with these observations, the C. neoformans Δsbh1 mutant is avirulent in a mouse infection model. We conclude that, in the context of conditions encountered during infection, Sbh1 controls the entry of virulence factors into the secretory pathway of C. neoformans, and thereby regulates fungal pathogenicity. IMPORTANCE Cryptococcus neoformans is a yeast that causes almost 200,000 deaths worldwide each year, mainly of immunocompromised individuals. The surface structures of this pathogen, a protective cell wall surrounded by a polysaccharide capsule, are made and maintained by proteins that are synthesized inside the cell and travel outwards through the secretory pathway. A protein called Sbh1 is part of the machinery that determines which polypeptides enter this export pathway. We found that when Sbh1 is absent, both C. neoformans and the model yeast S. cerevisiae show cell-wall defects. Lack of Sbh1 also changes the pattern of secretion of both transmembrane and soluble proteins, in a manner that depends on characteristics of their sequences. Notably, multiple proteins that are normally upregulated in conditions similar to those encountered during infection, including several needed for cryptococcal virulence, are no longer increased. Sbh1 thereby regulates the ability of this important pathogen to cause disease.

Recycled hybrid material for use as shielding in operations with ionizing radiation

One of the most efficient measures to prevent gamma radiation is shielding, which can take the form of protection barriers, storage containers, wall coating, bunkers, or many others aimed at minimizing the exposure of people to radiation. The materials used to this end have not changed much since the invention of X-rays, when materials with high attenuation capacity were employed, such as lead, tungsten, or concrete. These are all high-density materials and, therefore, also very heavy, and some of them are expensive and not environmentally friendly, as they do not have many possibilities with regards to their recycling. Circular economy provides an opportunity to reintroduce subproducts and waste in the same production processes that generated them or as raw matters in others. The use of sustainable materials is one of these options; however, there is little research in the field of radiation protection about the use of recycled material to this end, and there are few alternative sustainable options different from conventional materials that show similar behaviour. In our study, we have designed and built shielded panels called Mixlead® for gammagraphy, made of 100 % recyclable materials with sandwich structures combining polymeric fractions of electric cables and lead-alloy protection sheets used in the packaging of radiographic plates. With a methodology combining shielding calculations and a series of thermomechanical-radiological tests, it was possible to accurately determine the thickness of Mixlead® necessary to perform the tests with security guarantees and meeting sustainability requirements for radioactive sources of Iridium (192Ir) and Selenium (75Se), the use of the former being predominant, with an average activity of 1 GBq. In order to reduce this activity 2 and 10 times, the necessary thickness would be 24 and 79 mm respectively, which represents 3 or 4 layers of Mixlead® material.

Studi Laboratorium Bangunan Pantai Untuk Mereduksi Gelombang Tsunami Kasus Palu, Sulawesi Selatan

Indonesia ranked second as the country most frequently hit by tsunamis, earthquakes large and small often occur in Indonesia. The earthquake in Palu-Donggala, South Sulawesi in 2018 with a magnitude of 7.4 had generated a tsunami as high as 3-5 m, and the epicenter was in the north of the bay which resulted in the death toll and the destruction of infrastructure. In minimizing losses and casualties, structural disaster mitigation in the form of coastal buildings consisting of mangroves and vegetation as natural protection and sea walls as coastal reinforcement can be the right step to anticipate the vulnerability of the Palu Bay area. This study aimed to analyzed the level of attenuation in coastal structures and determine the best alternative for tsunami disaster mitigation planning. The test was carried out with a physical model using (wave flume) at the Balai Pantai Laboratory with a total of 48 times of testing with variations of three wave generation targets (0.07 m, 0.09 m, and 0.11 m), depth (0.40 m, 0.414). m, and 0.428 m) and the width of the vegetation (0.40 m, 0.70 m, and 1 m) which are divided into 24 scenarios. The results of the physical model test showed that the presence of coastal structures has a significant effect on the characteristics of the transmission waves, and the speed. The existence of mangrove forests and vegetation has succeeded in reducing wave transmission by 20-100%, also being able to reduce wave speed up to 100% significantly in the relative water level (Mean Water Level), reducing up to 87% at average elevation (Sea Water Level) ), and reduce up to 22% at the highest tide state (High Water Level).

Advances in material phase change modelling approach for EU-DEMO limiter’s plasma-facing components

Within the EU-DEMO first wall protection framework, work on limiter’s plasma-facing component design has started under plasma disruptive events (Richiusa et al., 2022). Starting from the rationale behind the TARTIFL&TTE software (Richiusa et al., 2022), this companion paper describes the progress on the engineering modelling of the plasma-facing material phase change under high heat flux, with the aid of COMSOL Multiphysics® software. The aim is to develop a reliable technique which can be used by designers for predicting how much of the solid armour undergoes phase change. This helps satisfy requirements for actively cooled components, such as at which armour depth safely locating the cooling system, and if its design can safely handle the heat transfer in the resulting component configuration after the disruption is extinguished. A few changes to the driving idea in Richiusa et al. (2022) will be also highlighted.The multiphysics software allows us to implement a 1D model which can be extended to 2D/3D geometries subjected to both uniform and non-uniform heat flux. It also offers the capability of conjugated heat transfer in solids and liquids by coupling the two different domains. Although this multiphysics approach is also investigated, no effort in melting layer motion modelling is done. Therefore, the equivalent way of validating this approach while reducing its computational time is working with one single solid domain, within which any liquid phase changes are tracked by an apparent heat capacity formulation. The vapour domain is not modelled. The material removal due to the evaporative mass flux is modelled by means of moving mesh frames which push the recessing liquid interface backwards according to gas kinetics-driven boundary conditions. The melt pool is not removed during the transient. Mass balance considerations drive the liquid-to-vapour interface velocity.The 3D Multiphisics implementation (3D-TARTIFL&TTE), is here supported by a benchmark activity and an application to the limiter’s plasma-facing armour, whose preferred chosen thickness is 20 mm.

Von Willebrand factor: from figurant to main character in the scene of inflammation

von Willebrand factor: from figurant to main character in the scene of inflammation

Melatonin-priming enhances maize seedling drought tolerance by regulating the antioxidant defense system.

Drought stress (DS) challenges sustainable agriculture production by limiting crop growth and development. The objective of the study was to evaluate the effect of melatonin-priming on enzymatic and non-enzymatic antioxidant defense mechanisms and its relation with leaf ultrastructure and stomatal traits in maize (Zea mays L) seedlings under DS (PEG-6000). DS drastically decreased seed germination, plant growth, and leaf chlorophyll content due to excessive reactive oxygen species (ROS) production. Melatonin-priming significantly (P < 0.05) increased seed germination, root length, shoot length, fresh seedling weight, proline content, total soluble protein content, sugar content, chlorophyll content, and stomatal aperture size by 101%, 30%, 133%, 51%, 22%, 59%, 54%, 20%, and 424%, compared to no priming (NP) under DS, respectively. Similarly, priming improved leaf ultrastructure and reduced the amount of chlorophyll loss and oxidative damage in maize seedlings. Melatonin seed priming with 500 µM melatonin (M2) greatly increased superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), glutathione, and ascorbate (AsA) activity, by 65%, 63%, 94%, 41%, and 55% compared to NP under DS and by 0.26%, 8%, 33%, 42%, and 15% under no-stress (NS), respectively. Melatonin-priming also reduced malondialdehyde content, electrolyte leakage, hydrogen peroxide (H2O2) content, and superoxide anion (O2-) content by 26%, 31%, 31%, and 33% compared to NP under DS and by 8%, 18%, 10%, and 11% under NS, respectively. In response to DS, melatonin-priming also stabilized the chloroplast structure, sustained cell expansion, protected cell walls, and greatly improved stomatal traits, including stomatal number, length, and width. Our results suggest that melatonin-priming improves drought tolerance in maize seedlings by alleviating the negative effect of ROS.

Safety of hydrogel spacers for rectal wall protection in patients with prostate cancer: A retrospective analysis of 200 consecutive cases.

To evaluate the safety and complications of hydrogel spacer implantation. This single-center historical cohort study retrospectively analyzed cases of hydrogel spacer implantation between October 2018 and March 2022. The survey items were the rates of possible hydrogel injection implementation, the success rate of hydrogel implantation including asymmetry, higher position, rectal wall infiltration, subcapsular injection, and other adverse events, and width created by the spacer. To investigate the learning curve, 1, 2, and 3 points were assigned to adverse event grades G1, G2, and G3, respectively. Spacer effectiveness obstruction, such as asymmetry was assigned 3 points. A Mann-Whitney U test was performed to assess statistically significant differences. The study included a total of 200 patients with a median (range) age of 70 (44-85) years. In 10 (5%) patients, hydrogel injection implementation was not possible. Of 190 patients who underwent hydrogel spacer placement, 168 (88%) received a satisfactory placement. The median (range) width of hydrogel spacers was 13.1 (4.4-18.7) mm. Spacer asymmetry, higher position, rectal wall infiltration, and prostate subcapsular infiltration occurred in 7 (3.7%), 5 (2.6%), 12 (6.3%), and 1 (0.5%) patients, respectively. G1 and G3 adverse events occurred in 13 (7%) and 4 (2%) patients, respectively. Practitioner #1 who performed the highest number of procedures had significantly (p=0.04) lower total scores in group B. Spacer implantation yielded favorable outcomes with a high percentage of appropriate spacer implantation, and few major complications.

Preparation and Characterization of Biomimetic SiO2-TiO2-PDMS Composite Hydrophobic Coating with Self-Cleaning Properties for Wall Protection Applications

Superhydrophobic surfaces have great potential for self-cleaning, anti-icing, and drag-reducing characteristics because of their water repellent property. This study demonstrates the potential application of coatings to protect architectures from detrimental atmospheric effects via a self-cleaning approach. In this research, a SiO2-TiO2-PDMS composite coating was prepared on the surface of building walls by the sol-gel method. Tetraethyl orthosilicate (TEOS) and titanium isopropoxide (TTIP) were used as inorganic precursors, and polydimethylsiloxane (PDMS) was used as low surface energy substances. The effects of TEOS and PDMS content on microstructure, wettability, and self-cleaning performance of coating wall surfaces were investigated by conducting various tests, including scanning electron microscopy (SEM), X-ray energy spectroscopy (EDS), angle measurement, and Fourier transform infrared spectroscopy (FTIR). The results indicated that hydrolysis and condensation reactions of TEOS, TTIP, and PDMS were performed on the surface of the substrates, leading to a micro- and nano-structure similar to the surface of lotus leaves. When the molar ratio of PDMS to TEOS was 1:5, the static contact angle of the coating reached a maximum of 152.6°. At this point, the coated surface was able to resist the adhesion of particle pollutants and liquid pollutants, which could keep the walls clean and possess a good ability of self-cleaning. In conclusion, SiO2-TiO2-PDMS composite coating is potentially useful in wall protection applications with its hydrophobic and environmentally friendly superhydrophobic properties.

Cell wall dynamics stabilize tip growth in a filamentous fungus.

Hyphal tip growth allows filamentous fungi to colonize space, reproduce, or infect. It features remarkable morphogenetic plasticity including unusually fast elongation rates, tip turning, branching, or bulging. These shape changes are all driven from the expansion of a protective cell wall (CW) secreted from apical pools of exocytic vesicles. How CW secretion, remodeling, and deformation are modulated in concert to support rapid tip growth and morphogenesis while ensuring surface integrity remains poorly understood. We implemented subresolution imaging to map the dynamics of CW thickness and secretory vesicles in Aspergillus nidulans. We found that tip growth is associated with balanced rates of CW secretion and expansion, which limit temporal fluctuations in CW thickness, elongation speed, and vesicle amount, to less than 10% to 20%. Affecting this balance through modulations of growth or trafficking yield to near-immediate changes in CW thickness, mechanics, and shape. We developed a model with mechanical feedback that accounts for steady states of hyphal growth as well as rapid adaptation of CW mechanics and vesicle recruitment to different perturbations. These data provide unprecedented details on how CW dynamics emerges from material secretion and expansion, to stabilize fungal tip growth as well as promote its morphogenetic plasticity.

Experimental study on wall-protecting mud modification of super-long bored pile in the alluvial plain region of the Yellow River

In this study, the effect of different additives (sodium carbonate, carboxymethyl cellulose, polyacrylamide, and barite powder) on modified mud performance and microstructure has been evaluated and the optimal proportion of the modified mud was determined. The specific gravity, viscosity, sand content, colloid rate, and water loss of modified mud has been investigated. The characteristics of mud cake in microstructure of modified mud have been also analyzed and evaluated by the scanning electron microscopy images (SEM). The results showed that adding bentonite dosage increased the specific gravity, the adding carboxymethyl cellulose increased the viscosity and dropped the water loss rate, and the pH value experienced a growth with the increasing sodium carbonate content. SEM tests revealed the additives made the overall structure of the mud cake more compact and enhanced the modified mud's wall protection effect and filtration loss reduction effect. The modified mud was successfully applied to the super-long pile of a project in the Yellow River alluvial plain area, which provided support for the dynamic adjustment of the mud proportion in the field construction.

Numerical Study on Protective Measures for a Skid-Mounted Hydrogen Refueling Station

Hydrogen refueling stations are one of the key infrastructure components for the hydrogen-fueled economy. Skid-mounted hydrogen refueling stations (SHRSs) can be more easily commercialized due to their smaller footprints and lower costs compared to stationary hydrogen refueling stations. The present work modeled hydrogen explosions in a skid-mounted hydrogen refueling station to predict the overpressures for hydrogen-air mixtures and investigate the protective effects for different explosion vent layouts and protective wall distances. The results show that the explosive vents with the same vent area have similar overpressure reduction effects. The layout of the explosion vent affects the flame shape. Explosion venting can effectively reduce the inside maximum overpressure by 61.8%. The protective walls can reduce the overpressures, but the protective walls should not be too close to the SHRS because high overpressures are generated inside the walls due to the confined shock waves. The protective wall with a distance of 6 m can effectively protect the surrounding people and avoid the secondary overpressure damage to the container.

Probable maximum precipitation analysis of high rainfall regions in India

Uttarakhand, Maharashtra, Assam & Meghalaya are the potential areas to study the precipitation, perform trend analysis and calculate the probable maximum precipitation. Probable Maximum Precipitation (PMP) has virtually zero risk of being exceeded for a given catchment area over a certain duration of time. The present work applies Hershfield Method to determine the PMP for rainfall data for the high rainfall regions of Uttarakhand, Maharashtra, Assam & Meghalaya (Assam and Meghalaya are considered as one region). Gumbel method, which is an extreme value distribution function is used to obtain the extreme value (EV) of precipitation. Further, the obtained PMP and EV values are compared with high rainfall months of La Niña years. Observation of the results showed that the obtained values from Hershfield Method are greater than the La Niña years precipitation values that have been observed till 2017, thus validating the obtained results. The outcomes from Probable Maximum Precipitation (PMP) works give insights into the extreme rainfall that can ever happen in a given catchment. The result obtained serves as indispensable input data for designing structures like dams, reservoirs, spillways, flood protection walls, sluice gates, weirs, etc. The design life of hydraulic structures is worked out using Probable Maximum Precipitation (PMF). The adopted technique and results of this study can be directly used as a design parameter for design as well as for water resources management.

Предотвращение каскадного развития пожара на тепловых электростанциях Вьетнама на основе применения резервуаров с защитной стенкой и волноотражающим козырьком

PURPOSE. The article, based on the results of an statistics analysis of vertical steel tanks (VST) destruction with flammable liquids, as well as forecasting the situation on the territory of a thermal power plant (TPP) during destruction of a typical VST-20 000 m3 with fuel oil, substantiates the need to use tanks with protective wall (TPW) and a wave-reflecting visor in tank farms at thermal power plants in Vietnam, as one of the promising methods aimed at preventing the possible cascading fire development at the facility or the occurrence of an emergency situation (ES). The main provisions of the method developed on the basis of performed experimental studies have been presented, which establishes the procedure for calculating the geometric parameters of a protective wall with a horizontal or inclined wave-reflecting visor, designed to completely contain the breakthrough wave during the quasi-instantaneous destruction of the main (internal) VST. METHODS. In the process of research methods of similarity theory and hydraulic laboratory modeling, physical experiment, observation, comparison, finding an empirical relationship based on mathematical processing of experimental data, description and generalization have been used. FINDINGS. The features of the location of thermal power plants in Vietnam have been revealed, consisting in their direct location in populated areas or near water bodies. It has been established that destruction of even one large-sized VST with flammable liquid in the tank farm of a thermal power plant can lead to a cascade development of an accident or emergency occurrence. It has been proven that installing a wave-reflecting visor on the protective wall is an effective way to reduce it to or below the maximum liquid level in the main VST, depending on the distance between the walls and the length of the visor extension. RESEARCH APPLICATION FIELD. The developed method, containing calculation schemes and empirical dependencies, can be the basis for the development of a regulatory document to ensure fire safety of TPW, including when they are located on the territory of tank farms of thermal power plants. CONCLUSIONS. The proposed design of the PWT, improved by installing a wave-reflecting visor, will make it possible to design and operate these types of tanks, ensuring the required level of fire, industrial and environmental safety at the protection site, subject to, among other things, the requirements for the stability of the wall and the visor to the effects of liquid flow and the main VST structures that collapse during an accident.

Calculation of the level of energy efficient heat protection

Introduction. The choice of the level of heat protection of buildings should be based on the economic performance of buildings, taking into account the cost of maintaining the pre-set thermal microclimate on the premises. Hence, it is necessary to initially determine the amount of energy consumed by the heating, atmospheric and mechanical cooling of buildings. Towards this end, buildings that are different in size and have different numbers of storeys are studied. These buildings are located in various Russian regions featuring different periods of heating and solar radiation intensity. They are Moscow (central Russia), Astrakhan (southern region) and Vorkuta (northern region).&#x0D; Materials and methods. The problem is solved computationally; the authors use buildings of different geometry that are located in Moscow, Astrakhan and Vorkuta. Various levels of heat protection of external walls and coatings, as well as different values of heat gain are considered. For all options, annual energy costs are calculated using primary fuel costs. Simulation and comparison were chosen as the main research methods.&#x0D; Results. The results are presented in the form of tables of annual primary energy consumption required to maintain the pre-set thermal parameters for various building options featuring different levels of heat protection and heat gain.&#x0D; Conclusions. According to the research findings, the highest level of heat protection is the best heat protection option from the standpoint of energy consumption in the cities under consideration (Moscow, Astrakhan and Vorkuta). Year-round heat gains reduce the load on the heating system during cold seasons; however, they have a negative impact du­ring warm seasons and transition periods due to the additional load on the air conditioning system. According to the calculation results, if the building heat density equals or exceeds 40 W/m2, some rooms may need cooling during cold seasons.

Shake table testing of a low-impact technology for the seismic protection of stone masonry

This paper presents a novel low-impact technique for the seismic protection of fair-face masonry walls. The proposed strengthening solution involves the use of carbon-fibre reinforced polymer (CFRP) connectors installed from the outside by perforating the stone elements, combined with grout injections. The connectors cover ¾ of the wall thickness, so as to leave the inner surface undisturbed. Once the work is completed, they are also substantially invisible. Shake table tests were carried out under natural accelerograms on two full-scale irregular multi-leaf stone masonry wall specimens. In order to replicate materials and construction technique of the Apennine historical buildings, the prototypes were made from stones recovered from the debris of a settlement in the municipality of Accumoli (RI, Italy), and the mortar was designed to reproduce lime-poor mortars surveyed in the field. The experimental setup was designed to induce out-of-plane vertical bending under base seismic motion, while allowing the vertical displacement of the wall top. One specimen was tested “as-built” and the other one was tested strengthened, to investigate the gain in seismic performance, the limitation of progressive damage accumulation and the effects on dynamic properties.

ГУМАНІТАРНА СКЛАДОВА ЖИТТЄВОГО ШЛЯХУ І ЛІТЕРАТУРНО-ПОЛІТИЧНОЇ СПАДЩИНИ ЧЕСЛАВА МІЛОША

The life path and literary and political heritage of the Polish poet, publicist and political thinker, Nobel Prize laureate Czeslaw Milosz are studied from a political point of view. Emphasis is placed on the humanitarian component of his life activity and creative output. On the basis of mainly multi-genre, politically oriented works of C. Milosh, key social problems that have not lost their relevance for the countries of Central and Eastern Europe, including Ukraine, are revealed: the importance of the language issue for national development and creative self-realization of the individual; the need to identify the causes and consequences of totalitarian rule in the specified region; increased attention to the acute political and sociohumanitarian problems of the post-imperial development of the countries of the «other Europe»; extrapolation of the thinker’s humanistic reflections on the needs of overcoming evil in the modern world, the formation of the future harmonious coexistence of man and humanity. On the example of Czeslaw Milosz, a connection is established between the events of planetary significance that took place in the brutal conditions of the 20th century, and the life and creativity of an individual. The relationship between the current needs for the establishment of humanitarian policy and the intuitive humanism of the creative work of an outstanding poet and thinker is analyzed, and important aspects for the formation of a holistic value model of social development based on the establishment of relationships between politics and culture are proposed for consideration. The political «diseases» of the 20th century identified by C. Milosz are considered — machiavellianism, messianism, violence, hostility, extreme nationalism, and the possibilities of overcoming them in modern conditions are outlined. On the basis of the creative biography of Milos, the difficulties of the life of the people of the 20th century in the Eastern European space are understood, such as: the loss of the principles of the humanistic Western European worldview, connected with the recognition of the «secondary status» of a large part of the Eastern European peoples and the artificially formed border between the two Europes; the provinciality of culture and the painful desire to overcome a distorted cultural identity; the reign of individual and collective untruth, the transformation of human consciousness and the mythologizing of reality in a totalitarian society. It was concluded that living in Central-Eastern Europe gives its inhabitants a chance to create a special type of culture in modern conditions, which, perhaps, someday the rest of Europe will take as a model. The desire of the Polish thinker for the formation of a «family» Europe — as a collection of «small homelands», each of which carefully protects its identity — is shown as too close to Ukrainians. It has been proven that the end of the utopian chimera with the bet on the creation of a «new man» and demarcation from Europe by a protective wall depends on every Ukrainian.

Urban Landscape in Modern Conditions

In ancient times, the city was a closed space, the main function of which was to protect the inhabitants. Cities in the early stages were isolated and autonomous, including economically. Regardless of the location, the layout included a central square and a market - the trade and economic center of the city, where goods were exchanged. The city remained a closed space until the advent of roads and transport capable of connecting settlements with each other, regardless of weather conditions. The emergence and development of transport has significantly accelerated the pace of life and economic processes. Thanks to transport, an economic space between cities has appeared. The development of economic relations strengthened relations between cities and reduced the need for defense. Gradually, the need for the protective walls of cities came to naught. Today, the defensive walls are for the most part a historical legacy of the past. The modern city has turned into an integral system aimed at meeting the needs of people as soon as possible. Human needs are the main engine of transformations taking place in the modern urban landscape. At present, the urban landscape and architecture are not rigidly tied to either architectural styles or national traditions of urban planning. The modern urban landscape meets the needs of people in comfort, convenience, environmental friendliness and aesthetics. The increase in urban population density, the need for mobility and convenience, as well as the modern demand for the environmental friendliness of the city as a system are the main reasons for the change in the modern urban landscape.

Green principles of ecological safety of transport construction

The current trend toward the use of 3D concrete printing represents a vector for green financing of innovative transportation projects and a shift from traditional construction to additive manufacturing and a closed-loop economy. The potential impact of additive technology in the field of transport infrastructure is expected to be greater than in any other, due to the scale of construction printing and its environmental potential to ensure the environmental safety of transport construction at the global, regional and local levels, which appears to be a relevant interdisciplinary research area. The article analyzes the transition to a "green economy," including the introduction of additive technologies and the rational use of construction resources. The article gives proposals for energy-efficient and ecological green construction of high-speed railways and provides a rationale for the use of additive technologies using 3D-printed noise protection walls made of eco-concrete (green concrete, geo-concrete). The main recommendations on the choice of structures, optimal for the implementation of active noise protection measures on high-speed railways and artificial constructions are given. Presented the work of PSTU students of the Faculty of Transport Construction on the subject of 3D printing of noise protection panels with different acoustic performance. Modern architectural solutions were made with the preparation of a feasibility study on the implementation of innovations and the development of green design competencies.

Анализ нормативного метода оценки доли перелившейся через ограждение жидкости при квазимгновенном разрушении резервуара

Purpose. When assessing fire risks at oil and petroleum product storage facilities, it is necessary, alongside, to consider the scenario of a liquid spill in case of quasi-explosive tank destruction. The breakthrough wave formed in this case is able to overflow through safety enclosure. The normative method allows assessing the proportion of overflowing liquid only through the enclosure in the form of vertical protective walls, while earth dikes of trapezoidal shape with different slope angles have become most widespread at the specified objects of protection. The article justifies the relevance of continuing the research on assessing the proportion of liquid overflowing through enclosures of various geometric shapes in case of quasi-explosive destruction of the tank. Methods. Statistical data analysis methods on actual quasi-explosive tank failures at production facilities in Russia and abroad have been used, including a full-scale experiment on the destruction of VST-700 with water, as well as observations, comparisons, descriptions, and generalizations. Findings. It is shown that the definition of the term quasi-explosive tank failure requires additions and clarifications based on statistical data analysis on the destruction of vertical steel tanks. The mechanism for opening the wall of a vertical steel tank has been clarified, which leads to the occurrence of a breakthrough wave, and its characteristics has been given. The application limitations of the existing method for estimating the proportion of overflowing liquid only through the enclosures in the form of vertical protective walls have been justified. Research application field. The results of the study can be used for developing the tenets of the method for determining fire risk design values at production facilities when considering a scenario related to a liquid spill in case of quasi-explosive destruction of a vertical steel tank. Conclusions. Based on the analysis results of the tenets of the method under consideration, the necessity to continue studies aimed at assessing the proportion of liquid overflowing through enclosures of various geometrical shapes during tank destruction, the value of which is needed for quantitative assessment of fire risks at production facilities, has been justified.

Preparation and research of intelligent drilling fluid based on temperature-sensitive modified bentonite

The application of intelligent materials in drilling fluids has greatly reduced the investment of human resources and effectively made up for the shortcomings of traditional drilling fluids, such as insufficient directivity, poor adaptive ability and difficult monitoring. Therefore, the research of intelligent drilling fluids is a valuable direction for the future oil and gas industry. In this study, the temperature-sensitive modified bentonite NIPAM-B developed by Pan Yi et al. was used as the drilling fluid base slurry, and the drilling fluid additives were optimized to complete the modulation of the intelligent drilling fluid inspection system. In addition, the rheology, filtration, shale wellbore stability and stability of the intelligent drilling fluid inspection system will be evaluated. The results show that the intelligent drilling fluid has good temperature-sensitive thickening performance, and the rheology is not affected by temperature changes, which can realize intelligent heating and thickening. In addition, compared with the original bentonite drilling fluid system, the intelligent drilling fluid has good fluid loss reduction ability and shale borehole wall protection ability, and the shale rolling recovery rate reaches more than 95 %.