The charge trapping/emission processes in silicon nanocrystalline nonvolatile memory assisted by electric field and elevated temperatures

In this work, the influence of elevated temperatures on charge trapping in Si nanoclusters located in oxide layer of MOS structure has been comprehensively studied. The samples with one layer of nanocrystals in the oxide have been studied using the modular data acquisition setup for capacitance-voltage measurements. The memory window formation and memory window retention experimental methods were used with the aim to study the trapping/emission processes inside the dielectric layer of MOS capacitor memory within the defined range of elevated temperatures. The trap activation energy and charge localization were determined from measured temperature dependences of charge retention. The electric field dependence of the activation energy with subsequent charge emission law have been determined

Design features of the working bodies of the harvester for harvesting melons and gourds

The research is aimed at the problems of the technological process of harvesting the fruits of melons, determining the current state of saturation with melons in the Volgograd region and the equipment of technical means intended for their harvesting. The purpose and objectives of the study are determined depending on the requirements for the design of agricultural machines. The design features of the working bodies of the harvester for harvesting melons and gourds are considered and described in detail in accordance with the requirements for harvesting them. As a result of the theoretical studies, the optimal performance indicators of the working bodies of the combine have been identified and their data have been presented, which will make it possible to create a high-quality design of the combine

Forsterite-rich accretionary rims around calcium-aluminum-rich inclusions from the reduced CV3 chondrite Efremovka

It was suggested that multilayered accretionary rims composed of ferrous olivine, andradite, wollastonite, salite-hedenbergitic pyroxenes, nepheline, and Ni-rich sulfides around Allende calcium aluminum-rich inclusions (CAIs) are aggregates of gas-solid condensates which reflect significant fluctuations in physico-chemical conditions in the slowly cooling solar nebula and grain/gas separation processes. In order to test this model, we studied the mineralogy of accretionary rims around one type A CAI (E104) and one type B CAI (E48) from the reduced CV3 chondrite Efremovka, which is less altered than Allende. In contrast to the Allende accretionary rims, those in Efremovka consist of coarse-grained (20-40 mum), anhedral forsterite (Fa(1-8)), Fe,Ni-metal nodules, amoeboid olivine aggregates (AOAs) and fine-grained CAIs composed of Al-diopside, anorthite, and spinel, +/- forsterite. Although the fine-grained CAIs, AOAs and host CAIs are virtually unaltered, a hibonite-spinel-perovskite CAI in the E48 accretionary rim experienced extensive alteration, which resulted in the formation of Fe-rich, Zn-bearing spinel, and a Ca, Al, Si-hydrous mineral. Forsterites in the accretionary rims typically show an aggregational nature and consist of small olivine grains with numerous pores and tiny inclusions of Al-rich minerals. No evidence for the replacement of forsterite by enstatite was found; no chondrule fragments were identified in the accretionary rims

Cation disorder and size effects on the magnetic transition in Ba-containing ferromagnetic manganites

PACS. 75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) - 75.50.Dd Nonmetallic ferromagnetic materials - 76.60.-k Nuclear magnetic resonance and relaxation,

Design features of the working bodies of the harvester for harvesting melons and gourds

The research is aimed at the problems of the technological process of harvesting the fruits of melons, determining the current state of saturation with melons in the Volgograd region and the equipment of technical means intended for their harvesting. The purpose and objectives of the study are determined depending on the requirements for the design of agricultural machines. The design features of the working bodies of the harvester for harvesting melons and gourds are considered and described in detail in accordance with the requirements for harvesting them. As a result of the theoretical studies, the optimal performance indicators of the working bodies of the combine have been identified and their data have been presented, which will make it possible to create a high-quality design of the combine

Influence of intensive etching processes on structure and properties of carbon nitride films

The influence of electromagnetic radiation and oxygen impurity in the growth atmosphere on the growth processes of nanostructured carbon nitride CNx films has been studied. The oxygen impurity in the gas mixture and an UV irradiation has been found to decrease the thickness and refraction index of carbon nitride films, while increasing the optical band gap width. The intensive etching processes result in the formation of closepacked columnar film nanostructures of carbon nitride.Подано результати досліджень впливу електромагнітного випромінювання і домішок кисню у ростовій атмосфері на процеси росту наноструктурних плівок нітриду вуглецю CNx. Виявлено, що домішка кисню у газовій суміші і ультрафіолетове опромінювання зменшують товщину і коефіцієнт заломлення плівок нітриду вуглецю, збільшують ширину забороненої зони. Показано, що інтенсивні процеси травлення приводять до утворення щільноупакованих колонарних плівкових наноструктур нітриду вуглецю.Представлены результаты исследований влияния электромагнитного излучения и примесей кислорода в ростовой атмосфере на процессы роста наноструктурных пленок нитрида углерода CNx. Обнаружено, что примесь кислорода в газовой смеси и УФ облучение уменьшают толщину и коэффициент преломления пленок нитрида углерода и увеличивают ширину запрещенной зоны. Интенсивные травящие процессы приводят к образованию плотноупакованных колонарных пленочных наноструктур нитрида углерода