Data acquisition from digital holograms of particles

A technique for data acquisition from digital holograms of particle ensembles, including preprocessing of the digital hologram, construction of a two-dimensional display of the holographic image of investigated volume, and segmentation and measurement of particle characteristics is considered. The proposed technique is realized in automatic regime and can work in real time. Results of the technique approbation using digital holograms of sand, plankton particles in water, and air bubbles in oil are presented

Research of purchase option in case of hedging with set probability

The formulas defining option cost and also evolution in time of portfolio and capital for the European option of purchase in case of hedging with set probability (fractile hedging) at continuous time and diffusion model of the (B, S)-financial market have obtained. Some properties of solution are investigated

The Status of the Legal Body in Public Law

The author examines the problem of vesting a state - owned corporation with the status of subject of law

Fast recognition of marine particles in underwater digital holography

The issue of fast recognition of marine particles in situ by digital holography methods is considered. An algorithm for the classification of marine particles by morphological features is proposed. Preliminary results and estimation of accuracy of the proposed algorithm are presented

Marine particles investigation by underwater digital holography

A hardware-software complex for non-contact investigation of marine particles is presented. The complex is based on digital holography principles and can be immersed in water, for example, to study plankton in a habitat. Special features of a submersible holocamera (or DHC sensor) are considered. Results of approbation of the complex during the Mission in the Kara Sea are presented. A new DHC sensor design is discusse

Реактивность ЭЭГ-характеристик у подростков с разной степенью успешности выполнения БОС-тренингов параметрами сердечного ритма

We consider the nature of the brain bioelectric activity changes in the dynamics of heart rate variability parameters biofeedback sessions in teenagers. There was revealed increase in predominance of the brain functional activity and increase in the stability of the subcortical brain structures. The biggest bioelectric reorganizations are revealed in the right brain hemisphere, often involving the frontal brain lobes. These changes were more pronounced in adolescents with successful completion of training.Рассматриваются изменения биоэлектрической активности мозга в динамике сеансов биоуправления параметрами вариабельности сердечного ритма у подростков. Выявлено усиление доминирования альфа-активности в структуре электроэнцефалограммы и повышение устойчивости подкорковых структур мозга. Наибольшие перестройки характерны для правого полушария, часто с вовлечением лобных отделов мозга. Данные изменения более выражены у подростков с успешным выполнением тренинга

Digital holographic camera for plankton monitoring

A submersible digital holographic camera for measuring plankton and other particles is described. The camera provides underwater recording of digital holograms of water volume containing plankton followed by automatic restoration of holographic images of plankton species, determination of their sizes, shapes, and concentrations, and their recognition and classification. Particles with sizes of 200 μm and larger are analyzed. The water volume registered per exposure is about 1 L. The special features of the software for automatic information retrieval from digital holograms are discussed. Examples of application of the camera as an integral part of the hardware-software complex for field measurements are given. Prospects for application of this complex for ecological monitoring are discussed. The recognition criterion of the digital holographic camera and the data volume and the averaging time required for obtaining statistically reliable data on plankton species are also given

On possibilities of diagnostics and formation of picosecond electron bunches in the linear accelerator by means of an optical deflector

The possibilities for measuring the phase charge distribution in picosecond bunches of the electron linac without application of an electron-optical chamber are discussed. It is proposed to use the measurement scheme based on the spatial scanning of the transition radiation light pulse equivalent to the electron bunch by means of a traveling-wave optical deflector. The estimations of the sensitivity and resolution of the method are given. The picosecond optical pulse trains can also be obtained by using the microwave scanning of a laser ray across the adjustable diaphragm. After amplification, the pulses can be used in microwave photo-emission guns.Обговорюються можливості застосування оптичного дефлектора бігучої хвилі для вимірювання фазового розподілу заряду в згустках пікосекундної тривалості ЛПЕ. Для одержання часового розділення ~1 пс пропонується використовувати перехідне оптичне випромінювання згустків та синхронну з ЛПЕ НВЧ розгортку в дефлекторі. Можливо також одержання серії пікосекундних оптичних імпульсів, використовуючи НВЧ сканування лазерного променя за діафрагмою, що регулюється. Після підсилення ці імпульси можна використати у НВЧ гарматах з фотоемісією.Обсуждаются возможности применения оптического дефлектора бегущей волны для измерения фазового распределения заряда в сгустках пикосекундной длительности ЛУЭ. Для получения временного разрешения ~1 пс предлагается использовать переходное оптическое излучение сгустков и синхронную с ЛУЭ СВЧ развертку в дефлекторе. Возможно также получение серий пикосекундных оптических импульсов, используя СВЧ сканирование лазерного луча по регулируемой диафрагме. После усиления эти импульсы могут быть использованы в СВЧ пушках с фотоэмиссией