Twins and their boundaries during homoepitaxy on Ir(111)

The growth and annealing behavior of strongly twinned homoepitaxial films on Ir(111) has been investigated by scanning tunneling microscopy, low energy electron diffraction and surface X-ray diffraction. In situ surface X-ray diffraction during and after film growth turned out to be an efficient tool for the determination of twin fractions in multilayer films and to uncover the nature of side twin boundaries. The annealing of the twin structures is shown to take place in a two step process, reducing first the length of the boundaries between differently stacked areas and only then the twins themselves. A model for the structure of the side twin boundaries is proposed which is consistent with both the scanning tunneling microscopy and surface X-ray diffraction data.Comment: 13 pages, 11 figure

Information technology as a tool to improve the competitiveness of the organization

In this article we are talking about competitiveness and how competitiveness is enhanced through information technology

Spiral Growth and Step Edge Barriers

The growth of spiral mounds containing a screw dislocation is compared to the growth of wedding cakes by two-dimensional nucleation. Using phase field simulations and homoepitaxial growth experiments on the Pt(111) surface we show that both structures attain the same characteristic large scale shape when a significant step edge barrier suppresses interlayer transport. The higher vertical growth rate observed for the spiral mounds on Pt(111) reflects the different incorporation mechanisms for atoms in the top region and can be formally represented by an enhanced apparent step edge barrier.Comment: 11 pages, 4 figures, partly in colo

Інтегральне числення функції однієї змінної. Матеріали методичного забезпечення поглибленого вивчення розділу студентами технічних спеціальностей

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НАСТРОЙКА МЕЖСЕТЕВОГО ЭКРАНА НА ШЛЮЗАХ СЕРИИ ZYWALL USG

В сети современного предприятия защита от угроз и контроль трафика является одной из основных задач. Устройства защиты сетей масштабов от малого до корпоративного офиса предназначаются для работы в качестве основного либо сегментного шлюза. В данной статье поэтапно расписана настройка межсетевого экрана такого шлюза на примере оборудования серии ZyWALL USG

Magnetism of cobalt nanoclusters on graphene on iridium

The structure and magnetic properties of Co clusters, comprising from 26 to 2700 atoms, self-organized or not on the graphene/Ir(111) moir\'e, were studied in situ with the help of scanning tunneling microscopy and X-ray magnetic circular dichroism. Surprisingly the small clusters have almost no magnetic anisotropy. We find indication for a magnetic coupling between the clusters. Experiments have to be performed carefully so as to avoid cluster damage by the soft X-rays