Quality assessment of educational process by teachers and students of technical college

Оценка качества образования (система оценок) зависит от структуры, содержания и характера образовательного процесса, уровня удовлетворенности этим процессом со стороны преподавателей и студентов, так как они выступают не только субъектами этих отношений, но являются объектами управления. Исследование, проведенное в 2012 г. в ПНИПУ, позволило зафиксировать характер отношения преподавателей и студентов к своей роли и месту в образовательном процессе. В исследование приняло участие 452 студента технических специальностей, 122 преподавателя, которые по характеру и содержанию преподаваемых дисциплин отражают специализацию подготовки выборочной совокупности студентов.The assessment of quality of education (system of estimates) depends on structure, the contents and nature of educational process, level of satisfaction with this process from teachers and students as they act not only subjects of these relations, but are objects of management. The research conducted in 2012 in PNIPU, allowed to record character of the relation of teachers and students to the role and a place in educational process. In research 452 students of different specialties, 122 teachers who on character and the content of taught disciplines reflect specialization of preparation of a sample of students took part

Coefficients Quantization at Off-axis Digital Hologram Wavelet Compression

Digital holographic information is compressed for storage of 2D- or 3D-objects amplitude and phase distributions, fast transmission, analyzing and displaying of these data. In this paper features of application of wavelet transforms for off-axis digital holograms compression are considered. The combined technique based on zero and twin orders elimination, wavelet compression of the amplitude and phase components of obtained Fourier spectrum and further additional compression of wavelet coefficients by thresholding and quantization is analyzed. Numerical experiments on reconstruction of images from the compressed holograms are performed. The comparative analysis of applicability of various wavelets and additional quantization of coefficients is performed. Obtained results demonstrate possibility of 180 and more times compression using iterative and noniterative methods of coefficients quantization and threshold zeroing less 80% of wavelet coefficients. Keywords: digital holography, hologram compression, wavelets, quantization, thresholding, digital image processing

Modeling carbon dynamics in two adjacent spruce forests with different soil conditions in Russia

International audienceNet ecosystem carbon exchange (NEE) were measured with eddy covariance method for two adjacent forests located at the southern boundary of European taiga in Russia in 1999?2004. The two spruce forests shared similar vegetation composition but differed in soil conditions. The wet spruce forest (WSF) possessed a thick peat layer (60 cm) with a high water table seasonally close to or above the soil surface. The dry spruce forest (DSF) had a relatively thin organic layer (5 cm) with a deep water table (>60 cm). The measured NEE fluxes (2000 and ?1440 kg C ha?1 yr?1 for WSF and DSF, respectively) indicated that WSF was a source while DSF a sink of atmospheric carbon dioxide during the experimental years. A process-based model, Forest-DNDC, was employed in the study to interpret the observations. The modeled NEE fluxes were 1800 and ?2200 kg C ha?1 yr?1 for WSF and DSF, respectively, which were comparable with the observations. The modeled data indicated that WSF and DSF had similar rates of photosynthesis and plant autotrophic respiration but differed in soil heterotrophic respiration. The simulations resulted in a hypothesis that the water table fluctuation at WSF could play a key role in determining the negative C balance in the ecosystem. A sensitivity test was conducted by running Forest-DNDC with varied water table scenarios for WSF. The results proved that the NEE fluxes from WSF were highly sensitive to the water table depth. When the water table dropped, the length of flooding season became shorter and more organic matter in the soil profile suffered from rapid decomposition that converted the ecosystem into a source atmospheric C. The conclusion from this modeling study could be applicable for a wide range of wetland and forest ecosystems that have accumulated soil organic C while face hydrological changes under certain climatic or land-use change scenarios

Editorial: Remembering Natalya Nikolaevna Vygodskaya

As the Guest Editor I want to dedicate this Special Issue in memory of my university professor Natalya Nikolaevna Vygodskaya (Figure 1) [...

Reactive diffusion in Sc/Si multilayer X-ray mirrors with CrB2 barrier layers

Processes undergoing in Sc/Si multilayer X-ray mirrors (MXMs) with periods of ∼27 nm and barrier layers of CrB20.3- and 0.7-nm thick within the temperature range of 420–780 K were studied by methods of small-angle Xray reflectivity (λ = 0.154 nm) and cross-sectional transmission electron microscopy. All layers with the exception of Sc ones are amorphous. Barrier layers are stable at least up to a temperature of 625 K and double the activation energy of diffusional intermixing at moderate temperatures. Introduction of barriers improves the thermal stability of Sc/Si MXMs at least by 80 degrees. Diffusion of Si atoms through barrier layers into Sc layers with formation of silicides was shown to be the main degradation mechanism of MXMs. A comparison of the stability for Sc/Si MXMs with different barriers published in the literature is conducted. The ways of further improvement of barrier properties are discusse

Raman spectra observation of silver nanoparticles in porous silicon fabricated by ion implantation

© 2015, Pleiades Publishing, Ltd. Porous silicon layers fabricated by the low-energy high-dose Ag+-ion implantation of crystalline silicon with doses from 7.5 × 1016 to 1.5 × 1017 ion/cm2 are studied by Raman spectroscopy. Pores with sizes from ∼100–180 nm formed on irradiated silicon surface are controlled by scanning electron microcopy. Synthesized silver nanoparticles are observed in the structure of porous silicon. The sizes of pour and nanoparticles are increased with an increase in implantation dose. Acoustic vibrations generated by laser irradiation in silver nanoparticles of various sizes are registered by low-temperature Raman spectra of composite material