Pub Date : 2023-04-15DOI: 10.37482/0536-1036-2023-2-38-57
Sergey A. Shavnin, Irek A. Yusupov, A. Montile, D. Golikov, Nataliya V. Marina
The seasonal changes in a period of low temperatures and characteristic correlations of some antioxidant system (AOS) components in pine needles influenced by a gas flare are investigated in this study. The parameters taken are total water content (TWC) in needles, peroxidase activity (AP) and selected elements of the antioxidant system of needles, such as content of carotenoids (Car), ascorbic acid (AA), catechins (Cat) and flavanols (Fl). The needles come from Scots pine trees (Pinus sylvestris L.), which grow in a gradient of environmental conditions formed in the zone of thermal field of the gas flare impact (at various distances). The gas flare is situated on the territory of the Khanty-Mansiysk Autonomous Okrug (UGRA) of Russia. Three hypotheses were subject to verification: 1) the thermal field of the gas flare during the low temperature period affects the water exchange and the AOS state of needles; 2) increase in temperature of the environment in the flare impact zone during the autumn-winter period causes the decrease in amount of moisture in needles, which is a trait of oxidative stress in cells; 3) in the functioning of а needle’s AOS, there are correlations between its components, which values depend on distance from the gas flare and environment created by it. It was found that in the thermal field gradient of the flare, there is neither an additional reduction in TWC in needles compared to the background nor signs of change in the state of AOS corresponding to the oxidative stress in the cells. The greatest impact of the gas flare on characteristics of the physiological state of pine needles is observed in the section closest to the flare. It reveals in the higher values of AP, TWC, Car and decrease in concentration of Fl and AA. The seasonal dynamics of the studied traits values do not correlate with the temperature of the environment. It indicates the indirect effect on the regulation of needle’s AOS activity. The factor and correlation analysis of the data indicate a difference in physiological state of pine needles at different distances from the flare. There is no domination of any processes in the functioning of AOS components. The observed correlations between the studied properties change according to distance to the flare. The most stable is a negative AP relationship with ofter parameters, which rise with the increased distance from the flare. The consistency degree of separate AOS components functioning is maximal in background conditions and decreases when approaching the flare. This fact is explained by the modifying effect of the flare on physiological and biochemical processes of the needle’s adaptation to specific climatic conditions of the environment. For citation: Shavnin S.A., Yusupov I.A., Montile A.A., Golikov D.Yu., Marina N.V. Seasonal Dynamics of Content of Antioxidant System Components in Needles of Scots Pine (Pinus sylvestris L.) Trees Situated in the Local Warming Impact Zone. Lesnoy Zhurnal = Russian F
{"title":"Seasonal Dynamics of Content of Antioxidant System Component in Needles of Scots Pine (Pinus sylvestris L.) Trees Situated in the Local Warming Impact Zone","authors":"Sergey A. Shavnin, Irek A. Yusupov, A. Montile, D. Golikov, Nataliya V. Marina","doi":"10.37482/0536-1036-2023-2-38-57","DOIUrl":"https://doi.org/10.37482/0536-1036-2023-2-38-57","url":null,"abstract":"The seasonal changes in a period of low temperatures and characteristic correlations of some antioxidant system (AOS) components in pine needles influenced by a gas flare are investigated in this study. The parameters taken are total water content (TWC) in needles, peroxidase activity (AP) and selected elements of the antioxidant system of needles, such as content of carotenoids (Car), ascorbic acid (AA), catechins (Cat) and flavanols (Fl). The needles come from Scots pine trees (Pinus sylvestris L.), which grow in a gradient of environmental conditions formed in the zone of thermal field of the gas flare impact (at various distances). The gas flare is situated on the territory of the Khanty-Mansiysk Autonomous Okrug (UGRA) of Russia. Three hypotheses were subject to verification: 1) the thermal field of the gas flare during the low temperature period affects the water exchange and the AOS state of needles; 2) increase in temperature of the environment in the flare impact zone during the autumn-winter period causes the decrease in amount of moisture in needles, which is a trait of oxidative stress in cells; 3) in the functioning of а needle’s AOS, there are correlations between its components, which values depend on distance from the gas flare and environment created by it. It was found that in the thermal field gradient of the flare, there is neither an additional reduction in TWC in needles compared to the background nor signs of change in the state of AOS corresponding to the oxidative stress in the cells. The greatest impact of the gas flare on characteristics of the physiological state of pine needles is observed in the section closest to the flare. It reveals in the higher values of AP, TWC, Car and decrease in concentration of Fl and AA. The seasonal dynamics of the studied traits values do not correlate with the temperature of the environment. It indicates the indirect effect on the regulation of needle’s AOS activity. The factor and correlation analysis of the data indicate a difference in physiological state of pine needles at different distances from the flare. There is no domination of any processes in the functioning of AOS components. The observed correlations between the studied properties change according to distance to the flare. The most stable is a negative AP relationship with ofter parameters, which rise with the increased distance from the flare. The consistency degree of separate AOS components functioning is maximal in background conditions and decreases when approaching the flare. This fact is explained by the modifying effect of the flare on physiological and biochemical processes of the needle’s adaptation to specific climatic conditions of the environment. For citation: Shavnin S.A., Yusupov I.A., Montile A.A., Golikov D.Yu., Marina N.V. Seasonal Dynamics of Content of Antioxidant System Components in Needles of Scots Pine (Pinus sylvestris L.) Trees Situated in the Local Warming Impact Zone. Lesnoy Zhurnal = Russian F","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"35 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87020383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-15DOI: 10.37482/0536-1036-2023-2-73-87
Aleksandr A. Ageev, Y. V. Saltsevich, L. Buryak
The article presents the results of a 5-year experiment on the cultivation of Siberian spruce seedlings combined with integrated use of biostimulants. Additionally, it describes an experience in application of the acquired planting material to artificial reforestation. The analysis of scientific publications was used for type selection of the chemical substances. The treatment for the seeds and the seedlings of Siberian spruce and the concentration of the growth promoters were chosen according to the “State Catalog of Pesticides and Agrochemicals Permitted for Use on the Territory of the Russian Federation”. For this purpose, the recommendations from manufacturers were also taken into concern. It is revealed that Ferovit (0.1 %) and Cytovite (0.01 %) are effective as pre-sowing treatment of the Siberian spruce seeds. Epin-Extra and Heteroauxin with concentrations of 0.002 % give a positive effect on the root development of the seedlings. The experiments showed that a certain sequential use of biostimulants at different stages of the seedling’s cultivation contributes to more intensive biochemical processes inside the plants (an increase in chlorophyll a, b, and carotenoids) with a positive correlation between height and phytomas in aerial parts. The combinations of the biostimulants, such as Ferovit–Heteroauxin and Cytovite–Epin-Extra–Heteroauxin, have improved the plant material within three years. The seedlings satisfied the requirements for the trunk’s height and diameter. They also demonstrated higher quality parameters, such as the proportion between aerial part and root system of the plants, as well as woodiness of the trunks. At the end of the nursery period, the planting material of Siberian spruce, cultivated according to the developed technology with all the requirements and regulations, was used to create a trial plot of forest. The reforestation of the Siberian spruce seedlings was made based on the standard recommendations and technical characteristics for the forestry equipment. The inventory inspection at the end of the first year demonstrated 98.7 % capacity for survival of the experimental trees. For citation: Ageev A.A., Saltsevich Yu.V., Buryak L.V. Integrated Application of Biostimulants in Cultivation of Siberian Spruce Seedlings (Picea obovata L). Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 2, pp. 73–87. (In Russ.). https://doi.org/10.37482/0536-1036-2023-2-73-87
{"title":"Integrated Application of Biostimulants in Cultivation of Siberian Spruce Seedlings (Picea obovata L.)","authors":"Aleksandr A. Ageev, Y. V. Saltsevich, L. Buryak","doi":"10.37482/0536-1036-2023-2-73-87","DOIUrl":"https://doi.org/10.37482/0536-1036-2023-2-73-87","url":null,"abstract":"The article presents the results of a 5-year experiment on the cultivation of Siberian spruce seedlings combined with integrated use of biostimulants. Additionally, it describes an experience in application of the acquired planting material to artificial reforestation. The analysis of scientific publications was used for type selection of the chemical substances. The treatment for the seeds and the seedlings of Siberian spruce and the concentration of the growth promoters were chosen according to the “State Catalog of Pesticides and Agrochemicals Permitted for Use on the Territory of the Russian Federation”. For this purpose, the recommendations from manufacturers were also taken into concern. It is revealed that Ferovit (0.1 %) and Cytovite (0.01 %) are effective as pre-sowing treatment of the Siberian spruce seeds. Epin-Extra and Heteroauxin with concentrations of 0.002 % give a positive effect on the root development of the seedlings. The experiments showed that a certain sequential use of biostimulants at different stages of the seedling’s cultivation contributes to more intensive biochemical processes inside the plants (an increase in chlorophyll a, b, and carotenoids) with a positive correlation between height and phytomas in aerial parts. The combinations of the biostimulants, such as Ferovit–Heteroauxin and Cytovite–Epin-Extra–Heteroauxin, have improved the plant material within three years. The seedlings satisfied the requirements for the trunk’s height and diameter. They also demonstrated higher quality parameters, such as the proportion between aerial part and root system of the plants, as well as woodiness of the trunks. At the end of the nursery period, the planting material of Siberian spruce, cultivated according to the developed technology with all the requirements and regulations, was used to create a trial plot of forest. The reforestation of the Siberian spruce seedlings was made based on the standard recommendations and technical characteristics for the forestry equipment. The inventory inspection at the end of the first year demonstrated 98.7 % capacity for survival of the experimental trees. For citation: Ageev A.A., Saltsevich Yu.V., Buryak L.V. Integrated Application of Biostimulants in Cultivation of Siberian Spruce Seedlings (Picea obovata L). Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 2, pp. 73–87. (In Russ.). https://doi.org/10.37482/0536-1036-2023-2-73-87","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"98 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90524790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-15DOI: 10.37482/0536-1036-2023-2-183-194
S. Makarov, Evgeniy S. Bagaev, A. Chudetsky, I. Kuznetsova, O. Lebedeva, A. Antonov
The creation of fast-growing triploid aspen plantations in the area of wood processing enterprises has high importance in terms of increasing demand for deciduous wood associated with the development of board production and the prospects for the introduction of innovative technologies for deep processing of wood. The article presents the results of studies of triploid aspen clones of Kostroma origin at the stages of “introduction to in vitro culture”, “proper micropropagation”, and “rooting of microshoots” with the use of growth-regulating substances. At the “introduction culture to in vitro” stage, the most effective sterilizing agents were silver nitrate with the concentration of 0.2 %, Lysoformin 3000, 5 % applied for 15 min and sulema, 0.2 % used for 10 min. At the “proper micropropagation” stage, the total length of triploid aspen shoots did not differ significantly depending on the composition of the nutrient media studied but was slightly exceeded the options with Woody Plant Medium. An increase by 1.2–2.6 times was observed in the total length of triploid aspen microshoots in vitro, when the concentration of 6-benzylaminopurine in the nutrient medium was increased from 0.5 to 1.0 mg/L. The maximum value of the total length (5.6 cm) of tryploid aspen microshoots in vitro was observed on Woody Plant Medium at the 6-benzylaminopurine concentration of 1.0 mg/L and the presence of Epin-Extra preparation of 0.5 mg/L. At the “rooting of microshoots” stage the number, average, and total length of triploid aspen roots in vitro had no statistically significant differences depending on the nutrient medium composition. Increasing the concentrations of indole-3-butyric acid and indole-3-acetic acid from 1.0 to 2.0 mg/L in the nutrient medium increased the total length of regenerated plant roots of triploid aspen in vitro by 2.3–2.4 times. The maximum total length (5.1 cm) of triploid aspen roots in vitro was observed on Woody Plant Medium with indole-3-butyric acid at a concentration of 1.0 mg/L. Clonal micropropagation appears to be a perspective for accelerated production of elite planting material of triploid aspen for the purposes of laying out timber plantations. For citation: Makarov S.S., Bagaev E.S., Chudetsky A.I., Kuznetsova I.B., Lebedeva O.P., Antonov A.M. Features of Triploid Aspen Clonal Micropropagation Using Modern Growth-Stimulating Preparations. Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 2, pp. 183–194. (In Russ.). https://doi.org/10.37482/0536-1036-2023-2-183-194
{"title":"Features of Triploid Aspen Clonal Micropropagation Using Modern Growth-Stimulating Preparations","authors":"S. Makarov, Evgeniy S. Bagaev, A. Chudetsky, I. Kuznetsova, O. Lebedeva, A. Antonov","doi":"10.37482/0536-1036-2023-2-183-194","DOIUrl":"https://doi.org/10.37482/0536-1036-2023-2-183-194","url":null,"abstract":"The creation of fast-growing triploid aspen plantations in the area of wood processing enterprises has high importance in terms of increasing demand for deciduous wood associated with the development of board production and the prospects for the introduction of innovative technologies for deep processing of wood. The article presents the results of studies of triploid aspen clones of Kostroma origin at the stages of “introduction to in vitro culture”, “proper micropropagation”, and “rooting of microshoots” with the use of growth-regulating substances. At the “introduction culture to in vitro” stage, the most effective sterilizing agents were silver nitrate with the concentration of 0.2 %, Lysoformin 3000, 5 % applied for 15 min and sulema, 0.2 % used for 10 min. At the “proper micropropagation” stage, the total length of triploid aspen shoots did not differ significantly depending on the composition of the nutrient media studied but was slightly exceeded the options with Woody Plant Medium. An increase by 1.2–2.6 times was observed in the total length of triploid aspen microshoots in vitro, when the concentration of 6-benzylaminopurine in the nutrient medium was increased from 0.5 to 1.0 mg/L. The maximum value of the total length (5.6 cm) of tryploid aspen microshoots in vitro was observed on Woody Plant Medium at the 6-benzylaminopurine concentration of 1.0 mg/L and the presence of Epin-Extra preparation of 0.5 mg/L. At the “rooting of microshoots” stage the number, average, and total length of triploid aspen roots in vitro had no statistically significant differences depending on the nutrient medium composition. Increasing the concentrations of indole-3-butyric acid and indole-3-acetic acid from 1.0 to 2.0 mg/L in the nutrient medium increased the total length of regenerated plant roots of triploid aspen in vitro by 2.3–2.4 times. The maximum total length (5.1 cm) of triploid aspen roots in vitro was observed on Woody Plant Medium with indole-3-butyric acid at a concentration of 1.0 mg/L. Clonal micropropagation appears to be a perspective for accelerated production of elite planting material of triploid aspen for the purposes of laying out timber plantations. For citation: Makarov S.S., Bagaev E.S., Chudetsky A.I., Kuznetsova I.B., Lebedeva O.P., Antonov A.M. Features of Triploid Aspen Clonal Micropropagation Using Modern Growth-Stimulating Preparations. Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 2, pp. 183–194. (In Russ.). https://doi.org/10.37482/0536-1036-2023-2-183-194","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"570 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77244079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-14DOI: 10.17073/1609-3577-2023-1-26-35
V. V. Kuts, A. Turutin, A. Kislyuk, I. Kubasov, R. Zhukov, A. Temirov, M. Malinkovich, N. Sobolev, Y. Parkhomenko
In this work the effect of annealing in a constant magnetic field on the magnetoelectric (ME) coefficient in three-layered gradient composites is investigated. A technique of nickel electrochemical deposition on bidomain lithium niobate crystals was demonstrated. It is shown that the optimum temperature for the formation of the maximum remanent magnetization of the Ni layer in a constant magnetic field is 350 °C. In the samples annealed at this temperature, the maximum shift of the dependence of the ME coefficient on the external constant magnetic field relative to the value of 0 Oe was achieved. Quasistatic ME coefficient value was 1.2 V/(cm∙Oe) without applying of external DC magnetic field. The maximum value of the ME coefficient was reached 199.3 V/(cm∙Oe) at bending resonance of 278 Hz without external DC magnetic field. Obtained in this work values of ME coefficients don’t yield to most of ME composite materials which were published before.
{"title":"Magnetoelectric effect in trilayered gradient composites LiNbO3/Ni/Metglas","authors":"V. V. Kuts, A. Turutin, A. Kislyuk, I. Kubasov, R. Zhukov, A. Temirov, M. Malinkovich, N. Sobolev, Y. Parkhomenko","doi":"10.17073/1609-3577-2023-1-26-35","DOIUrl":"https://doi.org/10.17073/1609-3577-2023-1-26-35","url":null,"abstract":"In this work the effect of annealing in a constant magnetic field on the magnetoelectric (ME) coefficient in three-layered gradient composites is investigated. A technique of nickel electrochemical deposition on bidomain lithium niobate crystals was demonstrated. It is shown that the optimum temperature for the formation of the maximum remanent magnetization of the Ni layer in a constant magnetic field is 350 °C. In the samples annealed at this temperature, the maximum shift of the dependence of the ME coefficient on the external constant magnetic field relative to the value of 0 Oe was achieved. Quasistatic ME coefficient value was 1.2 V/(cm∙Oe) without applying of external DC magnetic field. The maximum value of the ME coefficient was reached 199.3 V/(cm∙Oe) at bending resonance of 278 Hz without external DC magnetic field. Obtained in this work values of ME coefficients don’t yield to most of ME composite materials which were published before.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"41 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79724252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-14DOI: 10.17073/1609-3577-2023-1-56-65
A. V. Sabluk, A. Basharin
Since the early 1980s, the terahertz range (from 0.1 to 10 THz) attracts constant attention of both fundamental and applied physics. Due to its unique properties, terahertz radiation finds it’s applications in spectroscopy, defectoscopy, and security systems. The construction of efficient absorbers and converters in terahertz range is crucial for further development of terahertz technologies. In this work, we use a frequency-selective high-Q metamaterial to construct a converter of terahertz radiation into the infrared radiation. The converter consists of a metamaterial absorber of terahertz radiation covered with a micrometer thick layer of graphite, which emits in the infrared range the energy absorbed by the metamaterial. We have made a numerical electrodynamic and associated thermal simulation of the radiation converter. The metamaterial simulation at 96 GHz (low opacity window of the atmosphere) shows the electromagnetic radiation absorption coefficient of 99.998%, and the analytically calculated converter efficiency of 93.8%. Concluding the above our terahertz radiation converter may contribute to security systems and defectoscopy setups.
{"title":"Terahertz radiation converter based on metamaterial","authors":"A. V. Sabluk, A. Basharin","doi":"10.17073/1609-3577-2023-1-56-65","DOIUrl":"https://doi.org/10.17073/1609-3577-2023-1-56-65","url":null,"abstract":"Since the early 1980s, the terahertz range (from 0.1 to 10 THz) attracts constant attention of both fundamental and applied physics. Due to its unique properties, terahertz radiation finds it’s applications in spectroscopy, defectoscopy, and security systems. The construction of efficient absorbers and converters in terahertz range is crucial for further development of terahertz technologies. In this work, we use a frequency-selective high-Q metamaterial to construct a converter of terahertz radiation into the infrared radiation. The converter consists of a metamaterial absorber of terahertz radiation covered with a micrometer thick layer of graphite, which emits in the infrared range the energy absorbed by the metamaterial. We have made a numerical electrodynamic and associated thermal simulation of the radiation converter. The metamaterial simulation at 96 GHz (low opacity window of the atmosphere) shows the electromagnetic radiation absorption coefficient of 99.998%, and the analytically calculated converter efficiency of 93.8%. Concluding the above our terahertz radiation converter may contribute to security systems and defectoscopy setups.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"1 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81958604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-14DOI: 10.17073/1609-3577-2023-1-46-55
O. Boiprav, N. V. Bogush
The results of substantiation of the improved technology for manufacturing of the frequency-selective electromagnetic shields are presented. The improvement of this technology was ensured by the following: 1) the inclusion of elements in the form of classical Archimedes spirals, formed from foil materials, into the volume of manufactured shields to ensure the frequency-selective properties of such shields; 2) fixing the specified elements in the volume of manufactured shields by thermal pressing. The indicated features determine the main advantage of the improved technology in comparison with its analogues — lower time costs required for its implementation. The substantiation of the improved technology was implemented in the following areas: 1) setting the parameters of Spiral elements, which correspond to the maximum values of energy losses of the electromagnetic radiation interacting with them in the microwave range; 2) determination of the order of arrangement of spiral elements in the volume of the screens, which corresponds to the lowest values of electromagnetic radiation transmission and reflection coefficients in the microwave range of these shields. The substantiation implemented in the first of the indicated directions was based on the results of the analysis of the content of scientific works devoted to mathematical modeling and the study of the electromagnetic radiation of the transmission characteristics of flat spiral antennas in the microwave range. The substantiation implemented in the second of the indicated directions was based on the manufacture of experimental samples of the shields, the volume of which includes spiral elements oriented in a certain way, and further obtaining and comparative analysis of electromagnetic radiation transmission and reflection characteristics in the microwave range of these shields. Shields manufactured in accordance with substantiated improved technology seem to be promising for use in order to protect electronic devices from the effects of electromagnetic interference.
{"title":"Improved technology for manufacturing frequency-selective electromagnetic shields of the microwave range containing spiral elements","authors":"O. Boiprav, N. V. Bogush","doi":"10.17073/1609-3577-2023-1-46-55","DOIUrl":"https://doi.org/10.17073/1609-3577-2023-1-46-55","url":null,"abstract":"The results of substantiation of the improved technology for manufacturing of the frequency-selective electromagnetic shields are presented. The improvement of this technology was ensured by the following: 1) the inclusion of elements in the form of classical Archimedes spirals, formed from foil materials, into the volume of manufactured shields to ensure the frequency-selective properties of such shields; 2) fixing the specified elements in the volume of manufactured shields by thermal pressing. The indicated features determine the main advantage of the improved technology in comparison with its analogues — lower time costs required for its implementation. The substantiation of the improved technology was implemented in the following areas: 1) setting the parameters of Spiral elements, which correspond to the maximum values of energy losses of the electromagnetic radiation interacting with them in the microwave range; 2) determination of the order of arrangement of spiral elements in the volume of the screens, which corresponds to the lowest values of electromagnetic radiation transmission and reflection coefficients in the microwave range of these shields. The substantiation implemented in the first of the indicated directions was based on the results of the analysis of the content of scientific works devoted to mathematical modeling and the study of the electromagnetic radiation of the transmission characteristics of flat spiral antennas in the microwave range. The substantiation implemented in the second of the indicated directions was based on the manufacture of experimental samples of the shields, the volume of which includes spiral elements oriented in a certain way, and further obtaining and comparative analysis of electromagnetic radiation transmission and reflection characteristics in the microwave range of these shields. Shields manufactured in accordance with substantiated improved technology seem to be promising for use in order to protect electronic devices from the effects of electromagnetic interference.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"35 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73496398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-14DOI: 10.17073/1609-3577-2023-1-36-45
Y. Parkhomenko, A. Belov, E. V. Molodtsova, R. Kozlov, S. S. Kormilitsina, E. Zhuravlev
The calculation of conductivity electron concentrations in n-GaSb at T = 295 K and T = 77 K have been made. The concentration of “heavy” electrons in the L-valley of conduction band at Т = 295 K has been shown to exceed “light” electron one in the Γ-valley. On the contrary, at T = 77 K the conductivity electrons are gathered in the Γ-valley.The results of Hall measurements made on tellurium-doped samples of n-GaSb obtained by the Czochralski method have been represented. It has been shown that upon analysing Hall data at Т = 295 K, it is necessary to take into account the presence of two types of electrons (“light” and “heavy”); their concentrations are not possible to be determined. Seeming increase in electron concentration upon transition from T = 295 K to 77 K really does not take place. The electron concentration at T = 77 K may be determined correctly from the Hall data.
{"title":"Correct determination of electron concentration in n–GaSb from Hall data","authors":"Y. Parkhomenko, A. Belov, E. V. Molodtsova, R. Kozlov, S. S. Kormilitsina, E. Zhuravlev","doi":"10.17073/1609-3577-2023-1-36-45","DOIUrl":"https://doi.org/10.17073/1609-3577-2023-1-36-45","url":null,"abstract":"The calculation of conductivity electron concentrations in n-GaSb at T = 295 K and T = 77 K have been made. The concentration of “heavy” electrons in the L-valley of conduction band at Т = 295 K has been shown to exceed “light” electron one in the Γ-valley. On the contrary, at T = 77 K the conductivity electrons are gathered in the Γ-valley.The results of Hall measurements made on tellurium-doped samples of n-GaSb obtained by the Czochralski method have been represented. It has been shown that upon analysing Hall data at Т = 295 K, it is necessary to take into account the presence of two types of electrons (“light” and “heavy”); their concentrations are not possible to be determined. Seeming increase in electron concentration upon transition from T = 295 K to 77 K really does not take place. The electron concentration at T = 77 K may be determined correctly from the Hall data.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"791 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77533994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-14DOI: 10.17073/1609-3577-2023-1-5-16
A. Gurskii, N. Kalanda, M. Yarmolich, A. Petrov, P. N. Kireev
Based on the data of thermogravimetric analysis the values of the oxygen index (3–δ) in the manganite of the La0.7Sr0.3Mn0.9Fe0.1O3-δ composition, obtained by solid-phase reaction technique, have been calculated. The analysis of oxygen sorption-desorption curves showed that the processes of oxygen release and absorption at pO2 = 10 Pa and pO2 = 400 Pa are not reversible. The minima of the derivative dδ/dt = f(T) corresponding to the maxima of the oxygen extraction rate indicate the complex character of changes in the oxygen desorption rate from manganite. The decrease in the heating and cooling rate from 6.6 to 2.6 K/min resulted in a significant change in the value ∆δ, indicating the dependence of anion mobility on the oxygen concentration in the magnet structure. It has been revealed that in the La0.7Sr0.3Mn0.9Fe0.1O3-δ manganite the oxygen desorption kinetics is well described by the exponential dependence on the Cramers model, which implies no return of desorbed oxygen to the sample. This model indicates the non-stationarity of the diffusion flux through the barrier during desorption of oxygen from samples. The calculation of the activation energy of oxygen desorption by the Merzhanov method at various partial pressures of oxygen has shown that at the initial stage of oxygen extraction from La0.7Sr0.3Mn0.9Fe0.1O3-δ, the activation energy of oxygen desorption has a minimum value (Еа = 103.7 kJ/mol at δ = 0.005) and as the concentration of oxygen vacancies increases, it rises reaching saturation (Еа = 134.3 kJ/mol at δ = 0.06). It is assumed that with an increase in the concentration of oxygen vacancies, an interaction occurs between them, followed by the processes of their ordering with the formation of associates.
{"title":"Characteristic features of oxygen exchange in lanthanum-strontium manganites doped with iron","authors":"A. Gurskii, N. Kalanda, M. Yarmolich, A. Petrov, P. N. Kireev","doi":"10.17073/1609-3577-2023-1-5-16","DOIUrl":"https://doi.org/10.17073/1609-3577-2023-1-5-16","url":null,"abstract":"Based on the data of thermogravimetric analysis the values of the oxygen index (3–δ) in the manganite of the La0.7Sr0.3Mn0.9Fe0.1O3-δ composition, obtained by solid-phase reaction technique, have been calculated. The analysis of oxygen sorption-desorption curves showed that the processes of oxygen release and absorption at pO2 = 10 Pa and pO2 = 400 Pa are not reversible. The minima of the derivative dδ/dt = f(T) corresponding to the maxima of the oxygen extraction rate indicate the complex character of changes in the oxygen desorption rate from manganite. The decrease in the heating and cooling rate from 6.6 to 2.6 K/min resulted in a significant change in the value ∆δ, indicating the dependence of anion mobility on the oxygen concentration in the magnet structure. It has been revealed that in the La0.7Sr0.3Mn0.9Fe0.1O3-δ manganite the oxygen desorption kinetics is well described by the exponential dependence on the Cramers model, which implies no return of desorbed oxygen to the sample. This model indicates the non-stationarity of the diffusion flux through the barrier during desorption of oxygen from samples. The calculation of the activation energy of oxygen desorption by the Merzhanov method at various partial pressures of oxygen has shown that at the initial stage of oxygen extraction from La0.7Sr0.3Mn0.9Fe0.1O3-δ, the activation energy of oxygen desorption has a minimum value (Еа = 103.7 kJ/mol at δ = 0.005) and as the concentration of oxygen vacancies increases, it rises reaching saturation (Еа = 134.3 kJ/mol at δ = 0.06). It is assumed that with an increase in the concentration of oxygen vacancies, an interaction occurs between them, followed by the processes of their ordering with the formation of associates.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"109 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83930841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-14DOI: 10.17073/1609-3577-2023-1-76-84
I. Ganiev, R. J. Faizulloev, F. Zokirov, A. Safarov
Aluminum in terms of electrical conductivity among all known metals ranks fourth after silver, copper and gold. The electrical conductivity of annealed aluminum is approximately 62% IACS of the electrical conductivity of annealed standard copper, which at 20 °C. is taken as 100% IACS. However, due to its low specific gravity, aluminum has a conductivity per unit mass 2 times greater than copper. This property of aluminum gives us an idea of the economic viability of using it as a material for conductors. With equal conductivity (the same length), the aluminum conductor has a cross-sectional area 60% larger than copper, and its mass is only 48% of the mass of copper. In most cases, in electrical engineering, the use of aluminum as a conductor is difficult, and often simply impossible due to its low mechanical strength. An increase in the mechanical strength of aluminum is possible due to the introduction of alloying additives, i.e. creating alloys. In such a case, the mechanical strength increases, causing a noticeable decrease in electrical conductivity. The heat capacity of the aluminum conductor alloy AlTi0.1 (Al + 0.1 wt.% Ti) with calcium in the “cooling” mode was determined from the known heat capacity of the standard aluminum sample. Equations are obtained that describe the cooling rates of specimens made from an aluminum conductor alloy AlTi0.1 with calcium and a reference. Based on the calculated values of the cooling rates of the samples, the equations for the temperature dependence of the heat capacities of the alloys and the standard were formed. The temperature dependences of changes in enthalpy, entropy, and Gibbs energy for the aluminum alloy AlTi0.1 with calcium are calculated by integrating the specific heat capacity. The heat capacity, enthalpy, and entropy of the AlTi0.1 alloy decrease with increasing calcium concentration, and increase with increasing temperature, while the value of the Gibbs energy has an inverse relationship.
{"title":"Influence of calcium on specific heat capacity and changes in thermodynamic functions of aluminum conductor alloy AlTi0.1","authors":"I. Ganiev, R. J. Faizulloev, F. Zokirov, A. Safarov","doi":"10.17073/1609-3577-2023-1-76-84","DOIUrl":"https://doi.org/10.17073/1609-3577-2023-1-76-84","url":null,"abstract":"Aluminum in terms of electrical conductivity among all known metals ranks fourth after silver, copper and gold. The electrical conductivity of annealed aluminum is approximately 62% IACS of the electrical conductivity of annealed standard copper, which at 20 °C. is taken as 100% IACS. However, due to its low specific gravity, aluminum has a conductivity per unit mass 2 times greater than copper. This property of aluminum gives us an idea of the economic viability of using it as a material for conductors. With equal conductivity (the same length), the aluminum conductor has a cross-sectional area 60% larger than copper, and its mass is only 48% of the mass of copper. In most cases, in electrical engineering, the use of aluminum as a conductor is difficult, and often simply impossible due to its low mechanical strength. An increase in the mechanical strength of aluminum is possible due to the introduction of alloying additives, i.e. creating alloys. In such a case, the mechanical strength increases, causing a noticeable decrease in electrical conductivity. The heat capacity of the aluminum conductor alloy AlTi0.1 (Al + 0.1 wt.% Ti) with calcium in the “cooling” mode was determined from the known heat capacity of the standard aluminum sample. Equations are obtained that describe the cooling rates of specimens made from an aluminum conductor alloy AlTi0.1 with calcium and a reference. Based on the calculated values of the cooling rates of the samples, the equations for the temperature dependence of the heat capacities of the alloys and the standard were formed. The temperature dependences of changes in enthalpy, entropy, and Gibbs energy for the aluminum alloy AlTi0.1 with calcium are calculated by integrating the specific heat capacity. The heat capacity, enthalpy, and entropy of the AlTi0.1 alloy decrease with increasing calcium concentration, and increase with increasing temperature, while the value of the Gibbs energy has an inverse relationship.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"41 2 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83824234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-10DOI: 10.17073/1609-3577-2023-2-148-156
A. Kim, N. A. Serko, P. E. Khakuashev, A. N. Kolky, S. Yurchuk
The influence of aluminum oxide films obtained by high-frequency cathode sputtering of an Al2O3 target in argon atmosphere on charging properties of the SiO2/p-Si interface was investigated. High-frequency C-V characteristics for MIS-structure with one-layer dielectric films: SiO2 (0,10 µm and 0,36 µm), Al2O3 (0,14 µm) – and its double-layers compositions were measured. Experiment was carried out with a KDB-4.5 and a KDB-5000 substrates. Some electrophysical parameters of the obtained films such as UFB and Qss were calculated. Based on experimental results it was confirmed that the embedded negative charge of Al2O3 film prevented the formation of the inversive layer on p-Si surface by compensation of the embedded positive charge of SiO2 film and enhancement of semiconductor surface with majority charge carriers and, thus, allowed stabilization of charge properties of the SiO2/p-Si interface. The applicability of Al2O3 film as additional dielectric covering for manufacture technology of photodiodes on high-resistance p-Si was confirmed by applying on a multi-element p-i-n photosensitive element (PE) as an example. It was established that passivation of silicon dioxide on periphery and between the elements of PE by Al2O3 film improved I-V characteristics and insulation resistance, which lead to increased yield rate of photodiodes.
{"title":"Application of Al2O3 film for stabilization of charge properties of the SiO2/p-Si interface","authors":"A. Kim, N. A. Serko, P. E. Khakuashev, A. N. Kolky, S. Yurchuk","doi":"10.17073/1609-3577-2023-2-148-156","DOIUrl":"https://doi.org/10.17073/1609-3577-2023-2-148-156","url":null,"abstract":"The influence of aluminum oxide films obtained by high-frequency cathode sputtering of an Al2O3 target in argon atmosphere on charging properties of the SiO2/p-Si interface was investigated. High-frequency C-V characteristics for MIS-structure with one-layer dielectric films: SiO2 (0,10 µm and 0,36 µm), Al2O3 (0,14 µm) – and its double-layers compositions were measured. Experiment was carried out with a KDB-4.5 and a KDB-5000 substrates. Some electrophysical parameters of the obtained films such as UFB and Qss were calculated. Based on experimental results it was confirmed that the embedded negative charge of Al2O3 film prevented the formation of the inversive layer on p-Si surface by compensation of the embedded positive charge of SiO2 film and enhancement of semiconductor surface with majority charge carriers and, thus, allowed stabilization of charge properties of the SiO2/p-Si interface. The applicability of Al2O3 film as additional dielectric covering for manufacture technology of photodiodes on high-resistance p-Si was confirmed by applying on a multi-element p-i-n photosensitive element (PE) as an example. It was established that passivation of silicon dioxide on periphery and between the elements of PE by Al2O3 film improved I-V characteristics and insulation resistance, which lead to increased yield rate of photodiodes.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"18 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78000228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：