The word“spatial”fundamentally relates to human existence,evolution,and activity in terrestrial and even celestial spaces.After reviewing the spatial features of many areas,the paper describes basics of high level m...The word“spatial”fundamentally relates to human existence,evolution,and activity in terrestrial and even celestial spaces.After reviewing the spatial features of many areas,the paper describes basics of high level model and technology called Spatial Grasp for dealing with large distributed systems,which can provide spatial vision,awareness,management,control,and even consciousness.The technology description includes its key Spatial Grasp Language(SGL),self-evolution of recursive SGL scenarios,and implementation of SGL interpreter converting distributed networked systems into powerful spatial engines.Examples of typical spatial scenarios in SGL include finding shortest path tree and shortest path between network nodes,collecting proper information throughout the whole world,elimination of multiple targets by intelligent teams of chasers,and withstanding cyber attacks in distributed networked systems.Also this paper compares Spatial Grasp model with traditional algorithms,confirming universality of the former for any spatial systems,while the latter just tools for concrete applications.展开更多
Fe-Mo functionally graded materials(FGMs)with different composition-change rates from 100%304 stainless steel to 100%Mo along the composition gradient direction were prepared by electron beam-directed energy depositio...Fe-Mo functionally graded materials(FGMs)with different composition-change rates from 100%304 stainless steel to 100%Mo along the composition gradient direction were prepared by electron beam-directed energy deposition(EB-DED)technique,including three samples with composition mutation of 100%,composition change rate of 10%and 30%.Results show that the composition-change rate significantly affects the microstructure and mechanical properties of the samples.In the sample with abrupt change of composition,the sharp shift in composition between 304 stainless steel and Mo leads to a great difference in the microstructure and hardness near the interface between the two materials.With the increase in the number of gradient layers,the composition changes continuously along the direction of deposition height,and the microstructure morphology shows a smooth transition from 304 stainless steel to Mo,which is gradually transformed from columnar crystal to dendritic crystal.Elements Fe,Mo,and other major elements transform linearly along the gradient direction,with sufficient interlayer diffusion between the deposited layers,leading to good metallurgical bonding.The smaller the change in composition gradient,the greater the microhardness value along the deposition direction.When the composition gradient is 10%,the gradient layer exhibits higher hardness(940 HV)and excellent resistance to surface abrasion,and the overall compressive properties of the samples are better,with the compressive fracture stress in the top region reaching 750.05±14 MPa.展开更多
A distinctive feature of scholarly communities today is exploring topics and concepts in interdisciplinary and international contexts. This observation is increasingly apparent and visible in advancing our thinking an...A distinctive feature of scholarly communities today is exploring topics and concepts in interdisciplinary and international contexts. This observation is increasingly apparent and visible in advancing our thinking and policies related to human/environmental worlds at local, regional, and global scales. Maps are an important part of these innovative and ongoing research approaches. In this context, we consider urban forests a topic meriting more attention of scholars studying the geographic and environmental intersections of the natural sciences with the social sciences and humanities. We construct two innovative knowledge bases, one a conceptual framework based on major themes and concepts related to mapping urban forests using key words of the first 100 results of a Google Scholar query and a second using the number of Google Scholar hyperlinks about mapping urban forests in 244 capital cities. We discovered that the constructed world maps reveal vast global unevenness in our knowledge about urban forests in hyperlink numbers and ratios, results that merit further attention by disciplinary, international and interdisciplinary scholarly communities.展开更多
Prolonged lack of rain and high-temperature lead to soil water deficits,inhibiting cereal crop growth in early ontogenesis and reducing grain quality and yield.Rye(Secale cereale L.)is a key grain crop,particularly in...Prolonged lack of rain and high-temperature lead to soil water deficits,inhibiting cereal crop growth in early ontogenesis and reducing grain quality and yield.Rye(Secale cereale L.)is a key grain crop,particularly in regions where wheat cultivation is challenging or unfeasible.To clarify its drought adaptation mechanisms,we analyzed the effects of moderate soil drought on growth,hormonal homeostasis,and the dynamics and distribution of free amino acids and phenolic compounds in rye at early vegetative stages and post-recovery.Drought triggered both general and organ-specific changes in endogenous phytohormones.A nonspecific response involved the accumulation of stress hormones abscisic acid(ABA)and salicylic acid(SA),alongside the suppression of growth hormones indole-3-acetic acid(IAA)and gibberellins.However,hormone dynamics and localization varied across plant organs.ABA and SA levels significantly increased in shoots of drought-stressed and recovered plants,corresponding with inhibited growth.Prolonged drought further enhanced ABA accumulation in both shoots and roots of recovered plants,while SA levels declined in roots but remained elevated in shoots.Drought also caused a substantial reduction in IAA,particularly in shoots,while gibberellins(GA_(3)+GA_(4))significantly decreased in roots.GA_(3)was predominant in most samples,except in the shoots of 2-day-old control plants.Post-recovery,IAA levels increased but remained below control values,while GA_(4)accumulation in roots led to a rise in total gibberellin levels.In contrast,shoot GA_(3)+GA_(4)levels declined,primarily due to GA_(3)reduction.The dominant free amino acids:aspartic acid,glutamic acid,glycine,alanine,and leucinedecreased significantly,underscoring their key role in stress adaptation.Increased flavonoid accumulation,especially in roots,suggests their involvement in antioxidant defense against oxidative stress.A significant increase in ABA and SA levels,along with a marked reduction in IAA and GA content in stressed rye plants occurred alongside a reduction in free amino acid content,accumulation of phenolic compounds,and an increase in flavonoid levels.These findings indicate distinct adaptation strategies in rye shoots and roots undermoderate soil drought.They provide a foundation for further research on drought resistance mechanisms in cereals and the development of strategies to enhance their adaptive potential.展开更多
“Multidimensional international world”refers to understanding the world through multiple dimensions beyond traditional economic or political measures,fostering cross-cultural collaboration,and creating systems that ...“Multidimensional international world”refers to understanding the world through multiple dimensions beyond traditional economic or political measures,fostering cross-cultural collaboration,and creating systems that balance global integration with local needs.This also includes management of global business operations across diverse cultures in a multipolar international landscape.The paper briefs the developed and already tested in numerous applications high-level Spatial Grasp Model and Technology(SGT),which can help investigate and manage complex systems with a holistic spatial approach effectively covering various physical and virtual dimensions,their interrelations,and integration as a whole.Different areas will be investigated with examples of practical solutions in them and their combinations in a high-level Spatial Grasp Language(SGL),the key element of SGT.This allows for the creation and distributed management of very large spatial networks with different orientation which can be self-spreading,self-analyzing,self-modifying,and self-recovering in complex terrestrial and celestial environments,and also organize dynamic multi-networking solutions supporting global evolution and integrity.展开更多
The work deals with cellulose paper filled with nanocellulose and SrAl_(2)O_(4):Eu,Dy oxide phosphor.It was found that both nanocellulose and oxide improve the tensile strength of the composites obtained.The samples w...The work deals with cellulose paper filled with nanocellulose and SrAl_(2)O_(4):Eu,Dy oxide phosphor.It was found that both nanocellulose and oxide improve the tensile strength of the composites obtained.The samples with the oxide demonstrate a long-lasting photoluminescence(PL)under sunlight and ultra-violet(UV)illumination.Room-temperature the PL spectra reveal a wide multicomponent band spreading over all the visible spectral regions.The short-wavelength part of the band is ascribed to the cellulose-related luminescence,while the long-wavelength PL component with maxima near 540 nm corresponds to the luminescence of the SrAl_(2)O_(4):Eu,Dy phosphor.The dependency of the PL intensity on oxide concentration suggests the reabsorption of cellulose emission by the oxide and vice versa.The study of the dielectric properties of composite papers shows the presence of dielectric relaxations at low temperatures(T~−50℃).Similar cellulose materials to those studied can be considered as alternatives for artificial petroleum-based polymers.Low cost,eco-friendliness,biocompatibility,and the simplicity of recycling are among the main advantages of these materials.They are produced from the cellulose which is one of the most abundant renewable materials in nature.The data on the mechanical,dielectric,and optical properties indicate that the papers studied can be used in flexible lighting devices,WLEDs,coating,markers,labels,etc.展开更多
The increase in the population as a whole gradually requires solving the issues of continuous development of the agro-industrial complex in all directions and components.This development is accompanied by an increase ...The increase in the population as a whole gradually requires solving the issues of continuous development of the agro-industrial complex in all directions and components.This development is accompanied by an increase in energy consumption,in the total balance of which electricity occupies a significant share.The purpose of this study is to develop a mathematical model of the use of infrared means for heating agro-industrial premises,which affects the formation of energy-saving and energy-saving processes of enterprises.The agrarian potential of Ukraine was analyzed and compared with other countries of the world for awareness,analysis and relevant conclusions regarding energy consumption and frugality.This helped,based on calculations and foreign experience,to prove the effectiveness of the proposed mathematical model.And its empiric results of application in the form of the use of a copper plate allowed to prove efficiency due to the reduction of electricity consumption in the conditions of maintaining the temperature regime of industrial-type premises not higher than 22–26°C when the equipment is operating at an output power of 40 W.The results of the research are the development of the existing theoretical foundations of ensuring the effective use of energy resources in agricultural organizations and can be used by economic entities and regional authorities for the purpose of making informed decisions in the field of energy-saving policy development in the agricultural sector.展开更多
In contemporary China,nationalism under Xi Jinping operates through a dual mechanism that integrates domestic identity engineering with outward-facing narratives of moral leadership.This article argues that the Chines...In contemporary China,nationalism under Xi Jinping operates through a dual mechanism that integrates domestic identity engineering with outward-facing narratives of moral leadership.This article argues that the Chinese Communist Party(CCP)’s shift from describing China as a“unified multiethnic state”to promoting a“united community of the Chinese nation”(中华民族共同体)(China Daily,2017)marks a decisive ideological turn that normalizes assimilationist governance and reshapes the cultural and religious life of minority regions.Based on discourse analysis of Xi Jinping’s speeches,official policy documents,and ethnographic fieldwork conducted in Xinjiang in 2024,the study shows how this ideological shift produces a museumized multiculturalism that narrows space for ethnic autonomy and diversity.At the same time,China amplifies a peacebuilding discourse-particularly in its engagement with the Russo-Ukrainian war and conflicts in the Middle East-to present itself as a responsible global actor.The findings reveal three interlocking dynamics:First,cultural homogenization remains central to the Party’s long-term stability strategy;second,China’s civilizational rhetoric resonates most strongly where material partnerships outweigh normative concerns;and third,the contrast between domestic coercion and external reassurance functions not as a contradiction,but as a coherent political pattern.These dynamics show how nationalist ideology,cultural governance,and foreign-policy messaging form an integrated project that expands China’s influence while exposing the limits of its moral legitimacy.展开更多
为了进一步提高铝合金焊接接头质量,采用交变磁场辅助冷金属过渡技术(cold metal transfer,CMT)对同种6061铝合金对接焊,研究磁场对接头焊缝成形及组织性能的影响.结果表明,施加交变磁场可以获得良好的焊缝成形,并且可以显著降低接头气...为了进一步提高铝合金焊接接头质量,采用交变磁场辅助冷金属过渡技术(cold metal transfer,CMT)对同种6061铝合金对接焊,研究磁场对接头焊缝成形及组织性能的影响.结果表明,施加交变磁场可以获得良好的焊缝成形,并且可以显著降低接头气孔面积与气孔率的大小.施加交变磁场辅助后焊缝中心晶粒得到明显细化,焊缝平均硬度为77.10 HV0.2,相较于未施加磁场辅助提高了21.63%.通过能谱仪(energy dispersive spectrometer,EDS)对焊缝处元素含量检测,并推断出Al-Si共晶析出相主要沿着α-Al晶界分布.不同磁场参数下试样在热影响区中都存在软化区,拉伸断裂位置也在此区域,断裂类型属于韧性断裂.对焊缝区域进行电化学腐蚀,通过交流阻抗与动电位极化曲线结果可知,添加交变磁场辅助后焊缝处具有较好的耐腐蚀性.展开更多
BACKGROUND As cardiovascular mortality continues to increase globally,percutaneous coronary intervention(PCI)with stent placement stands out as a cutting-edge and highly effective treatment for severe cardiovascular d...BACKGROUND As cardiovascular mortality continues to increase globally,percutaneous coronary intervention(PCI)with stent placement stands out as a cutting-edge and highly effective treatment for severe cardiovascular diseases.However,the inherent invasiveness of any endovascular procedure introduces the risk of coronary vessel and myocardial damage.AIM To evaluate the utility of a novel electrocardiographic metric in detecting subtle myocardial injuries after coronary stenting.METHODS This investigation was conducted in 2021 at the Kyiv Heart Institute of the Ministry of Healthcare of Ukraine.The study involved 23 patients who underwent PCI,each subjected to a meticulous preoperative examination.A paired measurement approach was employed,encompassing 3-minutes electrocardiogram(ECG)recordings both before and several hours following the operation,using a compact ECG device.Each pair of ECG underwent a thorough analysis,scrutinizing 240 primary and computed ECG parameters.RESULTS The analysis delineated a distinct subgroup exhibiting significant myocardial damage post-stenting.This subgroup was characterized by an older average age and more stents than their counterparts.Notably,a concurrent reduction in the psychoemotional state index was observed alongside the ECG alterations in these patients,suggesting a correlation between myocardial damage and psychoemotional distress.Introducing a new electrocardiographic index has illuminated the often-subtle myocardial damage incurred during PCI.CONCLUSION The newly devised electrocardiographic metric is a significant advancement in the early detection of myocardial damage following PCI,able to capture not only physiological but also psychoemotional changes.展开更多
Wastewater plays a crucial role in deteriorating water quality and can significantly affect human health and ecosystems if discharged without proper treatment.Among available treatment methods,adsorption is often cons...Wastewater plays a crucial role in deteriorating water quality and can significantly affect human health and ecosystems if discharged without proper treatment.Among available treatment methods,adsorption is often considered an effective,relatively inexpensive,and environmentally friendly purification technique,but its efficiency depends on the sorbents used.The use of low-cost biosorbents with high adsorption capacity is widely studied.These include various biomaterials such as microalgae,cyanobacteria,fungi,and plant materials.The utilization of different biosorbents derived from plant waste,such as Paulownia wood,aspen,hickory,Ziziphus bark,peach tree shavings,as well as grasses such as red fescue and reed,and Sargassum algae in natural and modified forms,is a crucial research direction.Such studies highlight the potential to address waste issues by repurposing it as biosorbents.Several studies have examined the ability of different biosorbents to treat wastewater and suggested that the physicochemical properties of the material's surface,such as specific surface area,pore size,and pore volume,play a decisive role in adsorption capacity.A quantitative analysis of plant-based biosorbents will significantly aid in developing water treatment systems and achieving optimal adsorption through modifications of their physicochemical properties.Furthermore,the analysis will help understand the relative importance of each physicochemical property in determining adsorption capacity,thereby contributing to the implementation of treatment methods targeting specific pollutants.展开更多
Oil tanks are essential components of the oil industry, facilitating the safe storage and transportation of crude oil. Safely managing oil tanks is a crucial aspect of environmental protection. Oil tanks are often use...Oil tanks are essential components of the oil industry, facilitating the safe storage and transportation of crude oil. Safely managing oil tanks is a crucial aspect of environmental protection. Oil tanks are often used under extreme operational conditions, including dynamic loads, temperature variations, etc., which may result in unpredictable deformations that can cause severe damage or tank collapses. Therefore, it is essential to establish a monitoring system to prevent and predict potential deformations. Terrestrial laser scanning (TLS) has played a significant role in oil tank monitoring over the past decades. However, the full extent of TLS capabilities for oil tank monitoring has not yet been thoroughly investigated. This study aims to evaluate TLS’s abilities in detecting deformations of oil tanks under various operating conditions. The paper has two objectives: first, to examine the deformations of two vertical oil tanks over six years, and second, to investigate potential deformations of the tanks’ surfaces during filling. Each tank was scanned three times—in the years 2015, 2016, and 2021. Mathematical models and appropriate software were developed to determine the achievable accuracy of TLS monitoring. The anticipated monitoring accuracy was simulated based on the design parameters of the oil tanks. This accuracy was subsequently used to differentiate between deformations and measurement errors. The tank surface was approximated utilizing the cylinder equation for each monitoring epoch. Additionally, deformations were analyzed at different cross-sections with the appropriate circular approximations. The results indicated that both tanks exhibited no significant deformations within a range of less than 20 mm. For the empty tanks, the average radius decreased by 4 mm, without any changes in shape. The total spatial inclination of the oil tanks was calculated using cylinder equations at different monitoring epochs. In the final stage, the observed deformations were employed to simulate the strain-stress conditions of the oil tanks. Thus, this paper presents a complex technology and the results of oil tank monitoring by TLS under various operating conditions.展开更多
The study of the impact of high-temperature stress on the plant-phytopathogen system,including using nanoparticles,is relevant in connection with climate changes.Therefore,our work was aimed at studying the impact of ...The study of the impact of high-temperature stress on the plant-phytopathogen system,including using nanoparticles,is relevant in connection with climate changes.Therefore,our work was aimed at studying the impact of high-temperature stress on the physiological,biochemical,and growth processes of lentil plants under the conditions of pre-sowing treatment of seeds with Mo nanocitrates(Mo Ncit)and artificial infection with phytopathogenic microorganisms.Under high-temperature stress at 32-34°C(humidity 45 and 40%)in field conditions,a decrease in the photochemical activity of leaves of intact lentil plants was observed,due to the acclimatization of the photosynthetic apparatus.Infection with phytopathogenic phytoplasmas and bacteria disrupted the balance of free radicals in leaf tissues,because of which the activity of antioxidant enzymes SOD,POD,and phenolic compounds increased.This was likely the main reason for the disruption of the adaptation of the photosynthetic apparatus of plants to high-temperature stress under artificial infection with phytopathogenic phytoplasmas and bacteria,which destroyed pigment-protein complexes of PS II.As a result,the chlorophyll content in the leaves decreased.At the same time,physiological and biochemical changes in metabolism at presowing seed treatment with Mo Ncit compared to the control,caused an increase in the productivity of lentil plants in natural conditions under the combined action of various factors during the growing season:temperature fluctuations,air humidity,infection with phytopathogenic microorganisms.Therefore,infection with phytopathogenic microorganisms worsened the growth processes of plants,including due to a decrease in the adaptation of the photosynthetic apparatus to high-temperature stress.It is worth emphasizing that pre-treatment with molybdenum nanocitrates had a growth-stimulating and,to some extent,adaptive effect on plants and increased tolerance to phytopathogens.展开更多
文摘The word“spatial”fundamentally relates to human existence,evolution,and activity in terrestrial and even celestial spaces.After reviewing the spatial features of many areas,the paper describes basics of high level model and technology called Spatial Grasp for dealing with large distributed systems,which can provide spatial vision,awareness,management,control,and even consciousness.The technology description includes its key Spatial Grasp Language(SGL),self-evolution of recursive SGL scenarios,and implementation of SGL interpreter converting distributed networked systems into powerful spatial engines.Examples of typical spatial scenarios in SGL include finding shortest path tree and shortest path between network nodes,collecting proper information throughout the whole world,elimination of multiple targets by intelligent teams of chasers,and withstanding cyber attacks in distributed networked systems.Also this paper compares Spatial Grasp model with traditional algorithms,confirming universality of the former for any spatial systems,while the latter just tools for concrete applications.
基金National Natural Science Foundation of China(51975286)。
文摘Fe-Mo functionally graded materials(FGMs)with different composition-change rates from 100%304 stainless steel to 100%Mo along the composition gradient direction were prepared by electron beam-directed energy deposition(EB-DED)technique,including three samples with composition mutation of 100%,composition change rate of 10%and 30%.Results show that the composition-change rate significantly affects the microstructure and mechanical properties of the samples.In the sample with abrupt change of composition,the sharp shift in composition between 304 stainless steel and Mo leads to a great difference in the microstructure and hardness near the interface between the two materials.With the increase in the number of gradient layers,the composition changes continuously along the direction of deposition height,and the microstructure morphology shows a smooth transition from 304 stainless steel to Mo,which is gradually transformed from columnar crystal to dendritic crystal.Elements Fe,Mo,and other major elements transform linearly along the gradient direction,with sufficient interlayer diffusion between the deposited layers,leading to good metallurgical bonding.The smaller the change in composition gradient,the greater the microhardness value along the deposition direction.When the composition gradient is 10%,the gradient layer exhibits higher hardness(940 HV)and excellent resistance to surface abrasion,and the overall compressive properties of the samples are better,with the compressive fracture stress in the top region reaching 750.05±14 MPa.
文摘A distinctive feature of scholarly communities today is exploring topics and concepts in interdisciplinary and international contexts. This observation is increasingly apparent and visible in advancing our thinking and policies related to human/environmental worlds at local, regional, and global scales. Maps are an important part of these innovative and ongoing research approaches. In this context, we consider urban forests a topic meriting more attention of scholars studying the geographic and environmental intersections of the natural sciences with the social sciences and humanities. We construct two innovative knowledge bases, one a conceptual framework based on major themes and concepts related to mapping urban forests using key words of the first 100 results of a Google Scholar query and a second using the number of Google Scholar hyperlinks about mapping urban forests in 244 capital cities. We discovered that the constructed world maps reveal vast global unevenness in our knowledge about urban forests in hyperlink numbers and ratios, results that merit further attention by disciplinary, international and interdisciplinary scholarly communities.
基金This publication presents findings from research conducted under Project No.III-99-24.489Natural Growth Regulators in the Induction of Resistance of Cereal Plants to HeavyMetals(2024-2028)funded by the NationalAcademy of Sciences of Ukraine.
文摘Prolonged lack of rain and high-temperature lead to soil water deficits,inhibiting cereal crop growth in early ontogenesis and reducing grain quality and yield.Rye(Secale cereale L.)is a key grain crop,particularly in regions where wheat cultivation is challenging or unfeasible.To clarify its drought adaptation mechanisms,we analyzed the effects of moderate soil drought on growth,hormonal homeostasis,and the dynamics and distribution of free amino acids and phenolic compounds in rye at early vegetative stages and post-recovery.Drought triggered both general and organ-specific changes in endogenous phytohormones.A nonspecific response involved the accumulation of stress hormones abscisic acid(ABA)and salicylic acid(SA),alongside the suppression of growth hormones indole-3-acetic acid(IAA)and gibberellins.However,hormone dynamics and localization varied across plant organs.ABA and SA levels significantly increased in shoots of drought-stressed and recovered plants,corresponding with inhibited growth.Prolonged drought further enhanced ABA accumulation in both shoots and roots of recovered plants,while SA levels declined in roots but remained elevated in shoots.Drought also caused a substantial reduction in IAA,particularly in shoots,while gibberellins(GA_(3)+GA_(4))significantly decreased in roots.GA_(3)was predominant in most samples,except in the shoots of 2-day-old control plants.Post-recovery,IAA levels increased but remained below control values,while GA_(4)accumulation in roots led to a rise in total gibberellin levels.In contrast,shoot GA_(3)+GA_(4)levels declined,primarily due to GA_(3)reduction.The dominant free amino acids:aspartic acid,glutamic acid,glycine,alanine,and leucinedecreased significantly,underscoring their key role in stress adaptation.Increased flavonoid accumulation,especially in roots,suggests their involvement in antioxidant defense against oxidative stress.A significant increase in ABA and SA levels,along with a marked reduction in IAA and GA content in stressed rye plants occurred alongside a reduction in free amino acid content,accumulation of phenolic compounds,and an increase in flavonoid levels.These findings indicate distinct adaptation strategies in rye shoots and roots undermoderate soil drought.They provide a foundation for further research on drought resistance mechanisms in cereals and the development of strategies to enhance their adaptive potential.
文摘“Multidimensional international world”refers to understanding the world through multiple dimensions beyond traditional economic or political measures,fostering cross-cultural collaboration,and creating systems that balance global integration with local needs.This also includes management of global business operations across diverse cultures in a multipolar international landscape.The paper briefs the developed and already tested in numerous applications high-level Spatial Grasp Model and Technology(SGT),which can help investigate and manage complex systems with a holistic spatial approach effectively covering various physical and virtual dimensions,their interrelations,and integration as a whole.Different areas will be investigated with examples of practical solutions in them and their combinations in a high-level Spatial Grasp Language(SGL),the key element of SGT.This allows for the creation and distributed management of very large spatial networks with different orientation which can be self-spreading,self-analyzing,self-modifying,and self-recovering in complex terrestrial and celestial environments,and also organize dynamic multi-networking solutions supporting global evolution and integrity.
基金financed by the National Research Foundation of Ukraine(Project No.2022.01/0168).
文摘The work deals with cellulose paper filled with nanocellulose and SrAl_(2)O_(4):Eu,Dy oxide phosphor.It was found that both nanocellulose and oxide improve the tensile strength of the composites obtained.The samples with the oxide demonstrate a long-lasting photoluminescence(PL)under sunlight and ultra-violet(UV)illumination.Room-temperature the PL spectra reveal a wide multicomponent band spreading over all the visible spectral regions.The short-wavelength part of the band is ascribed to the cellulose-related luminescence,while the long-wavelength PL component with maxima near 540 nm corresponds to the luminescence of the SrAl_(2)O_(4):Eu,Dy phosphor.The dependency of the PL intensity on oxide concentration suggests the reabsorption of cellulose emission by the oxide and vice versa.The study of the dielectric properties of composite papers shows the presence of dielectric relaxations at low temperatures(T~−50℃).Similar cellulose materials to those studied can be considered as alternatives for artificial petroleum-based polymers.Low cost,eco-friendliness,biocompatibility,and the simplicity of recycling are among the main advantages of these materials.They are produced from the cellulose which is one of the most abundant renewable materials in nature.The data on the mechanical,dielectric,and optical properties indicate that the papers studied can be used in flexible lighting devices,WLEDs,coating,markers,labels,etc.
文摘The increase in the population as a whole gradually requires solving the issues of continuous development of the agro-industrial complex in all directions and components.This development is accompanied by an increase in energy consumption,in the total balance of which electricity occupies a significant share.The purpose of this study is to develop a mathematical model of the use of infrared means for heating agro-industrial premises,which affects the formation of energy-saving and energy-saving processes of enterprises.The agrarian potential of Ukraine was analyzed and compared with other countries of the world for awareness,analysis and relevant conclusions regarding energy consumption and frugality.This helped,based on calculations and foreign experience,to prove the effectiveness of the proposed mathematical model.And its empiric results of application in the form of the use of a copper plate allowed to prove efficiency due to the reduction of electricity consumption in the conditions of maintaining the temperature regime of industrial-type premises not higher than 22–26°C when the equipment is operating at an output power of 40 W.The results of the research are the development of the existing theoretical foundations of ensuring the effective use of energy resources in agricultural organizations and can be used by economic entities and regional authorities for the purpose of making informed decisions in the field of energy-saving policy development in the agricultural sector.
文摘In contemporary China,nationalism under Xi Jinping operates through a dual mechanism that integrates domestic identity engineering with outward-facing narratives of moral leadership.This article argues that the Chinese Communist Party(CCP)’s shift from describing China as a“unified multiethnic state”to promoting a“united community of the Chinese nation”(中华民族共同体)(China Daily,2017)marks a decisive ideological turn that normalizes assimilationist governance and reshapes the cultural and religious life of minority regions.Based on discourse analysis of Xi Jinping’s speeches,official policy documents,and ethnographic fieldwork conducted in Xinjiang in 2024,the study shows how this ideological shift produces a museumized multiculturalism that narrows space for ethnic autonomy and diversity.At the same time,China amplifies a peacebuilding discourse-particularly in its engagement with the Russo-Ukrainian war and conflicts in the Middle East-to present itself as a responsible global actor.The findings reveal three interlocking dynamics:First,cultural homogenization remains central to the Party’s long-term stability strategy;second,China’s civilizational rhetoric resonates most strongly where material partnerships outweigh normative concerns;and third,the contrast between domestic coercion and external reassurance functions not as a contradiction,but as a coherent political pattern.These dynamics show how nationalist ideology,cultural governance,and foreign-policy messaging form an integrated project that expands China’s influence while exposing the limits of its moral legitimacy.
基金Supported by The National Research Foundation of Ukraine,No.2023.04/0094。
文摘BACKGROUND As cardiovascular mortality continues to increase globally,percutaneous coronary intervention(PCI)with stent placement stands out as a cutting-edge and highly effective treatment for severe cardiovascular diseases.However,the inherent invasiveness of any endovascular procedure introduces the risk of coronary vessel and myocardial damage.AIM To evaluate the utility of a novel electrocardiographic metric in detecting subtle myocardial injuries after coronary stenting.METHODS This investigation was conducted in 2021 at the Kyiv Heart Institute of the Ministry of Healthcare of Ukraine.The study involved 23 patients who underwent PCI,each subjected to a meticulous preoperative examination.A paired measurement approach was employed,encompassing 3-minutes electrocardiogram(ECG)recordings both before and several hours following the operation,using a compact ECG device.Each pair of ECG underwent a thorough analysis,scrutinizing 240 primary and computed ECG parameters.RESULTS The analysis delineated a distinct subgroup exhibiting significant myocardial damage post-stenting.This subgroup was characterized by an older average age and more stents than their counterparts.Notably,a concurrent reduction in the psychoemotional state index was observed alongside the ECG alterations in these patients,suggesting a correlation between myocardial damage and psychoemotional distress.Introducing a new electrocardiographic index has illuminated the often-subtle myocardial damage incurred during PCI.CONCLUSION The newly devised electrocardiographic metric is a significant advancement in the early detection of myocardial damage following PCI,able to capture not only physiological but also psychoemotional changes.
文摘Wastewater plays a crucial role in deteriorating water quality and can significantly affect human health and ecosystems if discharged without proper treatment.Among available treatment methods,adsorption is often considered an effective,relatively inexpensive,and environmentally friendly purification technique,but its efficiency depends on the sorbents used.The use of low-cost biosorbents with high adsorption capacity is widely studied.These include various biomaterials such as microalgae,cyanobacteria,fungi,and plant materials.The utilization of different biosorbents derived from plant waste,such as Paulownia wood,aspen,hickory,Ziziphus bark,peach tree shavings,as well as grasses such as red fescue and reed,and Sargassum algae in natural and modified forms,is a crucial research direction.Such studies highlight the potential to address waste issues by repurposing it as biosorbents.Several studies have examined the ability of different biosorbents to treat wastewater and suggested that the physicochemical properties of the material's surface,such as specific surface area,pore size,and pore volume,play a decisive role in adsorption capacity.A quantitative analysis of plant-based biosorbents will significantly aid in developing water treatment systems and achieving optimal adsorption through modifications of their physicochemical properties.Furthermore,the analysis will help understand the relative importance of each physicochemical property in determining adsorption capacity,thereby contributing to the implementation of treatment methods targeting specific pollutants.
文摘Oil tanks are essential components of the oil industry, facilitating the safe storage and transportation of crude oil. Safely managing oil tanks is a crucial aspect of environmental protection. Oil tanks are often used under extreme operational conditions, including dynamic loads, temperature variations, etc., which may result in unpredictable deformations that can cause severe damage or tank collapses. Therefore, it is essential to establish a monitoring system to prevent and predict potential deformations. Terrestrial laser scanning (TLS) has played a significant role in oil tank monitoring over the past decades. However, the full extent of TLS capabilities for oil tank monitoring has not yet been thoroughly investigated. This study aims to evaluate TLS’s abilities in detecting deformations of oil tanks under various operating conditions. The paper has two objectives: first, to examine the deformations of two vertical oil tanks over six years, and second, to investigate potential deformations of the tanks’ surfaces during filling. Each tank was scanned three times—in the years 2015, 2016, and 2021. Mathematical models and appropriate software were developed to determine the achievable accuracy of TLS monitoring. The anticipated monitoring accuracy was simulated based on the design parameters of the oil tanks. This accuracy was subsequently used to differentiate between deformations and measurement errors. The tank surface was approximated utilizing the cylinder equation for each monitoring epoch. Additionally, deformations were analyzed at different cross-sections with the appropriate circular approximations. The results indicated that both tanks exhibited no significant deformations within a range of less than 20 mm. For the empty tanks, the average radius decreased by 4 mm, without any changes in shape. The total spatial inclination of the oil tanks was calculated using cylinder equations at different monitoring epochs. In the final stage, the observed deformations were employed to simulate the strain-stress conditions of the oil tanks. Thus, this paper presents a complex technology and the results of oil tank monitoring by TLS under various operating conditions.
基金the governmental funding of the National Academy of Sciences of Ukraine,registration number 0120U000224.
文摘The study of the impact of high-temperature stress on the plant-phytopathogen system,including using nanoparticles,is relevant in connection with climate changes.Therefore,our work was aimed at studying the impact of high-temperature stress on the physiological,biochemical,and growth processes of lentil plants under the conditions of pre-sowing treatment of seeds with Mo nanocitrates(Mo Ncit)and artificial infection with phytopathogenic microorganisms.Under high-temperature stress at 32-34°C(humidity 45 and 40%)in field conditions,a decrease in the photochemical activity of leaves of intact lentil plants was observed,due to the acclimatization of the photosynthetic apparatus.Infection with phytopathogenic phytoplasmas and bacteria disrupted the balance of free radicals in leaf tissues,because of which the activity of antioxidant enzymes SOD,POD,and phenolic compounds increased.This was likely the main reason for the disruption of the adaptation of the photosynthetic apparatus of plants to high-temperature stress under artificial infection with phytopathogenic phytoplasmas and bacteria,which destroyed pigment-protein complexes of PS II.As a result,the chlorophyll content in the leaves decreased.At the same time,physiological and biochemical changes in metabolism at presowing seed treatment with Mo Ncit compared to the control,caused an increase in the productivity of lentil plants in natural conditions under the combined action of various factors during the growing season:temperature fluctuations,air humidity,infection with phytopathogenic microorganisms.Therefore,infection with phytopathogenic microorganisms worsened the growth processes of plants,including due to a decrease in the adaptation of the photosynthetic apparatus to high-temperature stress.It is worth emphasizing that pre-treatment with molybdenum nanocitrates had a growth-stimulating and,to some extent,adaptive effect on plants and increased tolerance to phytopathogens.
