ESR study of the spin ladder with uniform Dzyaloshinskii-Moria interaction

Evolution of the ESR absorption in a strong-leg spin ladder magnet (C$_7$H$_{10}$N$_2$)$_2$CuBr$_4$ (abbreviated as DIMPY) is studied from 300K to 400mK. Temperature dependence of the ESR relaxation follows a staircase of crossovers between different relaxation regimes. We ague that the main mechanism of ESR line broadening in DIMPY is uniform Dzyaloshinskii-Moria interaction ($|\vec{D}|=0.20$K) with an effective longitudinal component along an exchange bond of Cu ions within the legs resulting from the low crystal symmetry of DIMPY and nontrivial orbital ordering. The same Dzyaloshinskii-Moriya interaction results in the lifting of the triplet excitation degeneracy, revealed through the weak splitting of the ESR absorption at low temperatures.Comment: 13 pages, submitted to PRB, Fig.3 update

Novel miR390-Dependent Transacting siRNA Precursors in Plants Revealed by a PCR-Based Experimental Approach and Database Analysis

TAS loci in plant genomes encode transacting small interfering RNAs (ta-siRNAs) that regulate expression of a number of genes. The function of TAS3 precursor in Arabidopsis thaliana is controlled by two miR390 target sites flanking two ta-siARF sequences targeting mRNAs of ARF transcription factors. Cleavage of the 3′-miR390-site initiates ta-siRNAs biogenesis. Here we describe the new method for identification of plant ta-siRNA precursors based on PCR with oligodeoxyribonucleotide primers mimicking miR390. The method was found to be efficient for dicotiledonous plants, cycads, and mosses. Based on sequences of amplified loci and a database analysis, a novel type of miR390-dependent TAS sequences was identified in dicots. These TAS loci are characterized by a smaller distance between miR390 sites compared to TAS3, a single copy of ta-siARF, and a sequence conservation pattern pointing to the possibility that processing of novel TAS-like locus is initiated by cleavage of the 5′-terminal miR390 target site

Energy-Saving and Environmental Protection Innovative Solutions in Engineering Systems of Buildings and Structures

Колоссальное расходование энергии приводит к лишним затратам и изменению природно-климатического состояния окружающей среды. Цель: уменьшить энергозатраты и снизить негативное влияние на окружающую среду посредствам увеличения использования возобновляемых источников энергии можно с помощью солнца, ветра и биомасс. Результаты: использование энергоактивных систем для зданий позволяет снизить энергетическое потребления объекта на 25-35%. Исключение опасных выбросов и разрушения экосистемы. Применение энергоактивных зданий является наиболее перспективным направлением развития энергетической сферы. Однако для полного перехода требуются развитие совершенных инженерных решений и поэтапной модернизации уже имеющихся систем.Colossal energy consumption leads to unnecessary costs and changes in the natural and climatic state of the environment. The goal: to reduce energy consumption and reduce the negative impact on the environment by increasing the use of renewable energy sources with the help of the sun, wind and biomass. Results: the use of energy-efficient systems for buildings reduces the energy consumption of the facility by 25-35%. Exclusion of dangerous emissions and destruction of the ecosystem. Conclusion: The use of energy-active buildings is the most promising direction for the development of the energy sector. However, a complete transition requires the development of advanced engineering solutions and the gradual modernization of existing systems

Systematic Improvements in Transmon Qubit Coherence Enabled by Niobium Surface Encapsulation

We present a novel transmon qubit fabrication technique that yields systematic improvements in T$_1$ coherence times. We fabricate devices using an encapsulation strategy that involves passivating the surface of niobium and thereby preventing the formation of its lossy surface oxide. By maintaining the same superconducting metal and only varying the surface structure, this comparative investigation examining different capping materials and film substrates across different qubit foundries definitively demonstrates the detrimental impact that niobium oxides have on the coherence times of superconducting qubits, compared to native oxides of tantalum, aluminum or titanium nitride. Our surface-encapsulated niobium qubit devices exhibit T$_1$ coherence times 2 to 5 times longer than baseline niobium qubit devices with native niobium oxides. When capping niobium with tantalum, we obtain median qubit lifetimes above 200 microseconds. Our comparative structural and chemical analysis suggests that amorphous niobium suboxides may induce higher losses. These results are in line with high-accuracy measurements of the niobium oxide loss tangent obtained with ultra-high Q superconducting radiofrequency (SRF) cavities. This new surface encapsulation strategy enables further reduction of dielectric losses via passivation with ambient-stable materials, while preserving fabrication and scalable manufacturability thanks to the compatibility with silicon processes

Therapeutic and prevention potential of seawater medicines

The mucous membrane of the nasal cavity is the opening part of the respiratory tract which has a number of functions among which protection is the most important. Once in the nasal cavity, the inhaled air is mechanically cleaned of dust pollutants, humidified and warmed. About 10 thousand litres of air pass through the nose during a day. The nasal mucosa also hinders penetration of pathogens (bacteria, fungi, viruses) into the lungs

ESR study of the spin ladder with uniform Dzyaloshinskii-Moriya interaction

©2015 American Physical Society. Evolution of the ESR absorption in a strong-leg spin ladder magnet (C7H10N)2CuBr4 (abbreviated as DIMPY) is studied from 300 K to 400 mK. Temperature dependence of the ESR relaxation follows a staircase of crossovers between different relaxation regimes. We argue that the main mechanism of ESR line broadening in DIMPY is uniform Dzyaloshinskii-Moriya interaction (|D|=0.31 K) with an effective longitudinal component along an exchange bond of Cu ions within the legs resulting from the low crystal symmetry of DIMPY and nontrivial orbital ordering. The same Dzyaloshinskii-Moriya interaction along with other weaker anisotropic spin-spin interactions results in the lifting of the triplet excitation degeneracy, revealed through the weak splitting of the ESR absorption at low temperatures