Experimental characterization of a broadband transmission-line cloak in free space

The cloaking efficiency of a finite-size cylindrical transmission-line cloak operating in the X-band is verified with bistatic free space measurements. The cloak is designed and optimized with numerical full-wave simulations. The reduction of the total scattering width of a metal object, enabled by the cloak, is clearly observed from the bistatic free space measurements. The numerical and experimental results are compared resulting in good agreement with each other.Comment: 5 pages, 7 figure

Facile regiodivergent synthesis of spiro pyrrole-substituted pseudothiohydantoins and thiohydantoins via reaction of [e]-fused 1H-pyrrole-2,3-diones with thiourea

This work is licensed under a Creative Commons Attribution 4.0 International License.A highly divergent synthesis of regioisomeric thiohydantoins and pseudothiohydantoins spiro-fused to a pharmacologically valuable pyrrole-2-one fragment involving the reaction of [e]-fused 1H-pyrrole-2,3-diones with thioureas was developed. The obtained spiro pseudothiohydantoin derivatives were found to undergo a pseudothiohydantoin–thiohydantoin rearrangement. The reactions were shown to proceed under catalyst-free conditions in good yields, and the products were isolated without applying preparative chromatography methods

Bistatic scattering characterization of a three-dimensional broadband cloaking structure

Here we present the results of full experimental characterization of broadband cloaking of a finite-sized metallic cylinder at X-band. The cloaking effect is characterized by measuring the bistatic scattering patterns of uncloaked and cloaked objects in free space and then comparing these with each other. The results of the measurements demonstrate a broadband cloaking effect and are in good agreement with numerical predictions.Comment: 5 pages, 5 figures; v2: some typos corrected (legends and caption of Fig. 3), section headings adde

Возрастная динамика нормальных древостоев ольхи серой в таежной зоне северо-востока европейской части России

Для организации, планирования и ведения лесного хозяйства на научной основе в насаждениях с преобладанием и участием ольхи серой (Alnus incana (L.) Moench), сформировавшихся в условиях таежной зоны, необходимы достоверные данные о строении, росте и продуктивности древостоев. В настоящее время ощущается острая необходимость в разработке таблиц хода роста для насаждений ольхи серой, так как площади, занятые этой породой, значительно увеличились в результате зарастания заброшенных сельскохозяйственных угодий. Разработка единой системы нормативных и справочных материалов для учета количества, оценки состояния и объема использования насаждений ольхи серой на Европейском Севере России является важной и актуальной задачей. Таблицы хода роста для нормальных древостоев ольхи серой в таежной зоне северо-востока европейской части России ранее не разрабатывались. Цель данного исследования – изучение возрастной динамики нормальных древостоев ольхи серой и составление таблиц хода роста. Использованы 193 модельных дерева ольхи серой, а также данные 175 пробных площадей. Полнота – 1,0. Получены уравнения для определения средней высоты, диаметра и запаса насаждений по классам бонитета. На основе уравнений разработаны таблицы хода роста нормальных древостоев по классам бонитета. Предложенные таблицы будут способствовать повышению точности таксации лесов, дадут возможность объективно оценить лесосырьевые ресурсы наиболее представленных древостоев, прогнозировать их рост при выполнении комплекса работ по охране, защите и воспроизводству лесных ресурсов, повышению экологических функций леса, а также контролировать ведение хозяйства в древостоях. Для цитирования: Третьяков С.В., Коптев С.В., Карабан А.А., Парамонов А.А., Давыдов А.В. Возрастная динамика нормальных древостоев ольхи серой в таежной зоне северо-востока европейской части России // Изв. вузов. Лесн. журн. 2023. № 6. С. 70–80. https://doi.org/10.37482/0536-1036-2023-6-70-8

Value Orientation “Patriotism”: Essence, Content, and Assessment

Background. In the modern historical period, taking into account the current military-political situation, the actualization of the idea of patriotism as a comprehensive element of spiritual integrity of people is a condition for the preservation of Russia as an independent and unified state. The analysis of Russian and foreign scientific literature as well as of regulatory legal documents has shown the absence of a unified approach to the essence and content of the value orientation “patriotism”. There was also no tool for assessing the level of value orientation “patriotism” found. Objective. The article focuses on the development of a theoretical model of the value orientation “patriotism” and a methodology for assessing the level of its formation. Sample. 1600 citizens of the Russian Federation took part in the empirical study. Methods. The study was conducted with an expert survey, focus groups and a sociological survey. Results. The ANOVA by Kraskel — Wallis showed the validity of the developed methodology for assessing the value orientation of “patriotism” and the absence of statistically significant differences when using it on different sample populations. Conclusion. The article reveals the essence and content of the value orientation “patriotism”, develops and substantiates its theoretical model, which includes 8 components, as well as means of formation and levels of manifestation. In addition, the study developed and successfully tested a methodology for assessing the level of development of the value orientation “patriotism”

Synthesis and properties of the heterospin (S1 = S2 = 1/2) radical-ion salt bis(mesitylene)molybdenum(I) [1,2,5]thiadiazolo[3,4-c][1,2,5]thiadiazolidyl

The authors are grateful to the Presidium of the Russian Academy of Sciences (Project 8.14), the Royal Society (RS International Joint Project 2010/R3), the Leverhulme Trust (Project IN-2012-094), the Siberian Branch of the Russian Academy of Sciences (Project 13), the Ministry of Education and Science of the Russian Federation (Project of Joint Laboratories of Siberian Branch of the Russian Academy of Sciences and National Research Universities), and the Russian Foundation for Basic Research (Projects 13-03-00072 and 15-03-03242) for financial support of various parts of this work. N.A.S. thanks the Council for Grants of the President of Russian Federation for postdoctoral scholarship (grant MK-4411.2015.3). B.E.B. is grateful for an EaStCHEM Hirst Academic Fellowship. A.V.Z. thanks the Foundation named after D. I. Mendeleev, Tomsk State University, for support of his work.Low-temperature interaction of [1,2,5]thiadiazolo[3,4-c][1,2,5]thiadiazole (1) with MoMes2 (Mes = mesitylene / 1,3,5-trimethylbenzene) in tetrahydrofuran gave the heterospin (S1 = S2 = 1/2) radical-ion salt [MoMes2]+[1]– (2) whose structure was confirmed by single-crystal X-ray diffraction (XRD). The structure revealed alternating layers of the cations and anions with the Mes ligands perpendicular, and the anions tilted by 45°, to the layer plane. At 300 K the effective magnetic moment of 2 is equal to 2.40 μB (theoretically expected 2.45 μB) and monotonically decreases with lowering of the temperature. In the temperature range 2−300 K, the molar magnetic susceptibility of 2 is well-described by the Curie-Weiss law with parameters C and θ equal to 0.78 cm3⋅K⋅mol–1 and −31.2 K, respectively. Overall, the magnetic behavior of 2 is similar to that of [CrTol2]+[1]– and [CrCp*2]+[1]–, i.e. changing the cation [MAr2]+ 3d atom M = Cr (Z = 24) with weak spin-orbit coupling (SOC) to a 4d atom M = Mo (Z = 42) with stronger SOC does not affect macroscopic magnetic properties of the salts. For the XRD structure of salt 2, parameters of the Heisenberg spin-Hamiltonian were calculated using the broken-symmetry DFT and CASSCF approaches, and the complex 3D magnetic structure with both the ferromagnetic (FM) and antiferromagnetic (AF) exchange interactions was revealed with the latter as dominating. Salt 2 is thermally unstable and slowly loses the Mes ligands upon storage at ambient temperature. Under the same reaction conditions, interaction of 1 with MoTol2 (Tol = toluene) proceeded with partial loss of the Tol ligands to afford diamagnetic product.PostprintPostprintPeer reviewe