Controlled Synchronization of One Class of Nonlinear Systems under Information Constraints

Output feedback controlled synchronization problems for a class of nonlinear unstable systems under information constraints imposed by limited capacity of the communication channel are analyzed. A binary time-varying coder-decoder scheme is described and a theoretical analysis for multi-dimensional master-slave systems represented in Lurie form (linear part plus nonlinearity depending only on measurable outputs) is provided. An output feedback control law is proposed based on the Passification Theorem. It is shown that the synchronization error exponentially tends to zero for sufficiantly high transmission rate (channel capacity). The results obtained for synchronization problem can be extended to tracking problems in a straightforward manner, if the reference signal is described by an {external} ({exogenious}) state space model. The results are applied to controlled synchronization of two chaotic Chua systems via a communication channel with limited capacity.Comment: 8 pages, 2 figure

Modern microwave methods in solid state inorganic materials chemistry: from fundamentals to manufacturing

No abstract available

Obtaining of hydroxylated fullerenes Y@C82OX(OH)Y, Y2@C82OX(OH)Y, Y2C2@C82OX(OH)Y and electrophysical characteristic of composite film based thereon

The article presents, for the first time, the results of the research on composite film obtained from hydroxylated endohedral metallofullerenes (EMF) Y@C82, Y2@C82, with Y2C2@C82 and highest fullerenes as dopant. The composite film has been established to have electric conductivity and to be a ferroelectric with the value of residual polarization of ~0.75 mkC/cm2. The impedance spectroscopy of this sample allowed us to determine dispersion of dielectric permittivity and conductivity in the range of frequencies of 0.5Hz–100MHz. It is stated that the value of the high-frequency dielectric permittivity of films is e' = 2.8. However, with reduction in the electric field frequency, real and imaginary parts of e increase to values ~10^4–10^5. Such increase in dielectric permittivity is connected with increase in polarizing caused by accumulation of mobile electric charges (electrons of ions, protons) on boundaries of the structural defects of a film, which are divided by thin dielectric interlayers. The film is solid electrolyte with the ionic conductivity of ~5*10^(-7) S/cm

Filtration process combined with mechanical action, as a method for efficient extraction of endohedral metallofullerenes from carbon soot

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The paper presents results of fullerenes and endohedral metallofullerenes extracts studies, isolated from the graphite rods carbon soot spray, and containing Y2O3 in a high frequency arc discharge. Two ways of extraction were applied and compared – (1) the classic method of Soxhlet extraction, and (2) the one developed by our team – extraction based on mechanical action combined with filtration. To implement the method, we used a laboratory version of installation, embodying technical solutions for rapid extraction. Chromatographic and mass spectrometry studies of fullerene extracts obtained by these methods revealed that by combining mechanical action with simultaneous filtration, we can significantly intensify and reduce the process of extracting fullerenes and endohedral metallofullerenes compared to the Soxhlet extraction method. This is especially evident in the release of endohedral metallofullerenes. Our method allows to reduce the release time of fullerenes from 10 g of carbon soot on laboratory installation up to 15 minutes, against the Soxhlet extraction method taking 18 hours. Whilst, the total number of fullerenes extracted by both methods almost coincides (the extraction method using mechanical action allowed us to extract 0.2-0.4 wt. % more), the composition of the isolated fullerene mixtures is different. The relative content of higher fullerenes and endohedral metallofullerenes exceeds when the mechanical action-based extraction method applied

The Properties of the Water-Soluble Hydroxy-Polyhydroxy fullerenes in Auto-Oxidation Reactions Epinephrine

В данной работе проведено исследование влияния фуллеренолов на реакцию автоокисления адреналина с помощью оптических и теоретических методов. Показано, что фуллеренол в концентрациях от 0,0005 до 0,5 мг/мл проявляет прооксидантную активность и ускоряет реакцию автоокисления адреналина. С помощью метода функционала плотности B3LYP/6- 31(p,d) представлена предполагаемая схема реакции автоокисления, которая объясняется энергетической выгодой при переносе электрона с молекулы адреналина на молекулуThe studied of the influence of fullerenoles on adrenaline auto-oxidation reaction by optical and theoretical methods was carried out in this work. It was shown that fullerenols at concentrations from 0.0005 mg/ml to 0.5 mg/ml exhibits prooxidant activity and accelerates autoxidation reaction of adrenaline. The suggested scheme of auto-oxidation reaction, which explained by energy advantage under transferring electron from the molecule of adrenaline to fullerenol by density functional method B3LYP/6-31(p,d

The Properties of the Water-Soluble Hydroxy-Polyhydroxy fullerenes in Auto-Oxidation Reactions Epinephrine

В данной работе проведено исследование влияния фуллеренолов на реакцию автоокисления адреналина с помощью оптических и теоретических методов. Показано, что фуллеренол в концентрациях от 0,0005 до 0,5 мг/мл проявляет прооксидантную активность и ускоряет реакцию автоокисления адреналина. С помощью метода функционала плотности B3LYP/6- 31(p,d) представлена предполагаемая схема реакции автоокисления, которая объясняется энергетической выгодой при переносе электрона с молекулы адреналина на молекулуThe studied of the influence of fullerenoles on adrenaline auto-oxidation reaction by optical and theoretical methods was carried out in this work. It was shown that fullerenols at concentrations from 0.0005 mg/ml to 0.5 mg/ml exhibits prooxidant activity and accelerates autoxidation reaction of adrenaline. The suggested scheme of auto-oxidation reaction, which explained by energy advantage under transferring electron from the molecule of adrenaline to fullerenol by density functional method B3LYP/6-31(p,d

All-Polymer Solar Cell Performance Optimized via Systematic Molecular Weight Tuning of Both Donor and Acceptor Polymers

The influence of the number-average molecular weight (<i>M</i>_n) on the blend film morphology and photovoltaic performance of all-polymer solar cells (APSCs) fabricated with the donor polymer poly­[5-(2-hexyldodecyl)-1,3-thieno­[3,4-<i>c</i>]­pyrrole-4,6-dione-<i>alt</i>-5,5-(2,5-bis­(3-dodecylthiophen-2-yl)­thiophene)] (<b>PTPD3T</b>) and acceptor polymer poly­{[<i>N</i>,<i>N</i>′-bis­(2-octyldodecyl)­naphthalene-1,4,5,8-bis­(dicarboximide)-2,6-diyl]-<i>alt</i>-5,5′-(2,2′-bithiophene)} (P­(NDI2OD-T2); <b>N2200</b>) is systematically investigated. The <i>M</i>_n effect analysis of <i>both</i> <b>PTPD3T</b> and <b>N2200</b> is enabled by implementing a polymerization strategy which produces conjugated polymers with tunable <i>M</i>_ns. Experimental and coarse-grain modeling results reveal that systematic <i>M</i>_n variation greatly influences both intrachain and interchain interactions and ultimately the degree of phase separation and morphology evolution. Specifically, increasing <i>M</i>_n for both polymers shrinks blend film domain sizes and enhances donor–acceptor polymer–polymer interfacial areas, affording increased short-circuit current densities (<i>J</i>_sc). However, the greater disorder and intermixed feature proliferation accompanying increasing <i>M</i>_n promotes charge carrier recombination, reducing cell fill factors (<i>FF</i>). The optimized photoactive layers exhibit well-balanced exciton dissociation and charge transport characteristics, ultimately providing solar cells with a 2-fold PCE enhancement versus devices with nonoptimal <i>M</i>_ns. Overall, it is shown that proper and precise tuning of both donor and acceptor polymer <i>M</i>_ns is critical for optimizing APSC performance. In contrast to reports where maximum power conversion efficiencies (PCEs) are achieved for the highest <i>M</i>_ns, the present two-dimensional <i>M</i>_n optimization matrix strategy locates a PCE “sweet spot” at intermediate <i>M</i>_ns of both donor and acceptor polymers. This study provides synthetic methodologies to predictably access conjugated polymers with desired <i>M</i>_n and highlights the importance of optimizing <i>M</i>_n for <i>both</i> polymer components to realize the full potential of APSC performance