Неразрушающий контроль качества конструкции управляемых по скорости двигателей-маховиков для систем ориентации космических аппаратов на этапах экспериментальной отработки

Достоверность результатов определения динамических качеств космического аппарата существенным образом зависит от достоверности определения силовых и моментных возмущений, действующих на космический аппарат со стороны его функциональных систем. Интегральная оценка динамического состояния управляемого по скорости двигателя-маховика выполняется посредством определения его силомоментной и вибрационной характеристик

Метод обнаружения группы объектов с перекрытием изображений

Предложен метод обнаружения перекрытия изображений объектов. Проведена оптимизация отношения сигнал/шум при обнаружении группы объектов с перекрытием изображений. На примере группы двух объектов с пространственно-временным перекрытием изображений дана оценка изменения фазы сигнала и количественная оценка выигрыша по вероятности обнаружения объектов предложенным методом

Large-signal model of the Metal-Insulator-Graphene diode targeting RF applications

We present a circuit-design compatible large-signal compact model of metal-insulator-graphene (MIG) diodes for describing its dynamic response for the first time. The model essentially consists of a voltage-dependent diode intrinsic capacitance coupled with a static voltage-dependent current source, the latter accounts for the vertical electron transport from/towards graphene, which has been modeled by means of the Dirac-thermionic electron transport theory through the insulator barrier. Importantly, the image force effect has been found to play a key role in determining the barrier height, so it has been incorporated into the model accordingly. The resulting model has been implemented in Verilog A to be used in existing circuit simulators and benchmarked against an experimental 6-nm TiO2 barrier MIG diode working as a power detector.Comment: 4 pages, 5 figures, 1 tabl

An Historical Survey of the Establishment of an Orchestral Tradition in Christchurch to 1939

This dissertation is the first study devoted solely to the history of an orchestral tradition in Christchurch. Within a timeframe stretching from the beginning of the local settlement to the establishment of the first “national” orchestra in 1939, it provides detailed portrayals of all facets of amateur and professional orchestral activity. This includes the histories of all orchestral bodies, their membership, a chronology of concerts, repertoire, programme structure and critical reception. This dissertation explains the advance of orchestral tradition that is at times tentative and at times bold, until it is securely entrenched as a mainstream musical activity in Christchurch. A preliminary narration, which begins in 1857, ends in 1906 with the International Exhibition. This is then discussed as a landmark event for orchestral music in Christchurch. A series of case studies for the period of 1908 to 1939, covers each of the five major orchestral groups that flourished in this period. The case studies also include the footprints of development, the “incidental” music performed by the cinema orchestras, and the “studio only” performances of many broadcasting groups. The role played by minor orchestral groups as an “alternative” music culture is included, along with the impact of orchestras associated with visiting opera companies. The final section is a detailed analysis of the repertoire and programme construction, and a discussion of the people who played an influential role in the development of an orchestral tradition. Numerous tables and illustrations are provided. A number of appendices are also attached: a chronology of orchestral concerts in Christchurch; some significant orchestra personnel lists; an extensive set of source readings discussing the formation of a permanent orchestra; a chronology of orchestral activity for a selection of Christchurch musicians; a timeline of visiting opera companies, and a selection of concert programmes

ЗАВИСИМОСТЬ СПЕКТРА ПОТРЕБЛЯЕМОЙ МОЩНОСТИ ЭЛЕКТРОДВИГАТЕЛЯ НАСОСА ОТ ФИЗИЧЕСКИХ ПАРАМЕТРОВ МЕХАНИЗМА

In article dependence of the electric motor power consumption spectrum on physical parameters of the pump is proved. It is proved transitivity of transformation of methods of vibration-acoustic diagnostics in methods energy power diagnosticsУ статті доведено залежність спектру споживаємої потужності електродвигуна насосу від фізичніх параметрів механізму. Доведено транзитивність перетворення методів віброакустичної діагностики в методи енергодіагностики

All CVD Boron Nitride Encapsulated Graphene FETs with CMOS Compatible Metal Edge Contacts

We report on the fabrication and characterization of field effect transistors (FETs) based on chemical vapor deposited (CVD) graphene encapsulated between few layer CVD boron nitride (BN) sheets with complementary metal oxide semiconductor (CMOS) compatible nickel edge contacts. Non-contact Tera-hertz time domain spectroscopy (THz-TDS) of large-area BN/graphene/BN (BN/G/BN) stacks reveals average sheet conductivity >1 mS/sq and average mobility of 2500 cm$^{2}$/Vs. Improved output conductance is observed in direct current (DC) measurements under ambient conditions, indicating potential for radio-frequency (RF) applications. Moreover, we report a maximum voltage gain of 6 dB from a low frequency signal amplifier circuit. RF characterization of the GFETs yields an f$_{T}$ x L$_{g}$ product of 2.64 GHz$\mu$m and an f$_{Max}$ x L$_{g}$ product of 5.88 GHz$\mu$m. This study presents for the first time THz-TDS usage in combination with other characterization methods for device performance assessment on BN/G/BN stacks. The results serve as a step towards scalable, all CVD 2D material-based FETs for CMOS compatible future nanoelectronic circuit architectures.Comment: 6 page