542 research outputs found
Graphene on Rh(111): STM and AFM studies
The electronic and crystallographic structure of the graphene/Rh(111) moir\'e
lattice is studied via combination of density-functional theory calculations
and scanning tunneling and atomic force microscopy (STM and AFM). Whereas the
principal contrast between hills and valleys observed in STM does not depend on
the sign of applied bias voltage, the contrast in atomically resolved AFM
images strongly depends on the frequency shift of the oscillating AFM tip. The
obtained results demonstrate the perspectives of application atomic force
microscopy/spectroscopy for the probing of the chemical contrast at the
surface.Comment: manuscript and supplementary information; submitted to Appl. Phys.
Lett. on 01.03.201
Structural and electronic properties of the graphene/Al/Ni(111) intercalation-like system
Decoupling of the graphene layer from the ferromagnetic substrate via
intercalation of sp metal has recently been proposed as an effective way to
realize single-layer graphene-based spin-filter. Here, the structural and
electronic properties of the prototype system, graphene/Al/Ni(111), are
investigated via combination of electron diffraction and spectroscopic methods.
These studies are accompanied by state-of-the-art electronic structure
calculations. The properties of this prospective Al-intercalation-like system
and its possible implementations in future graphene-based devices are
discussed.Comment: 20 pages, 8 figures, and supplementary materia
Electronic structure, imaging contrast and chemical reactivity of graphene moir\'e on metals
Realization of graphene moir\'e superstructures on the surface of 4d and 5d
transition metals offers templates with periodically modulated electron
density, which is responsible for a number of fascinating effects, including
the formation of quantum dots and the site selective adsorption of organic
molecules or metal clusters on graphene. Here, applying the combination of
scanning probe microscopy/spectroscopy and the density functional theory
calculations, we gain a profound insight into the electronic and topographic
contributions to the imaging contrast of the epitaxial graphene/Ir(111) system.
We show directly that in STM imaging the electronic contribution is prevailing
compared to the topographic one. In the force microscopy and spectroscopy
experiments we observe a variation of the interaction strength between the tip
and high-symmetry places within the graphene moir\'e supercell, which determine
the adsorption cites for molecules or metal clusters on graphene/Ir(111).Comment: submitted on Sep, 6th 201
Scanning tunneling and atomic force microscopies studies
The electronic and crystallographic structure of the graphene/Rh(111) moiré
lattice is studied via combination of density-functional theory calculations
and scanning tunneling and atomic force microscopy(STM and AFM). Whereas the
principal contrast between hills and valleys observed in STM does not depend
on the sign of applied bias voltage, the contrast in atomically resolved AFM
images strongly depends on the frequency shift of the oscillating AFM tip. The
obtained results demonstrate the perspectives of application atomic force
microscopy/spectroscopy for the probing of the chemical contrast at the
surface
Scientific rationale of ingredients choice for functional fish pastes
In recent years, the global demand for finished fish products is increased. Aquaculture raw materials are a rich source of nutrients for health. At the same time a large amount of fished fish raw materials are rejected and representing a losses. High-quality raw materials with technological defects are not in demand by the food production of fish products. Perishable substandard fish raw materials can be used in the production of combined fish products. The analysis of the fish catches global scale in the seas, oceans, farmed marine and freshwater aquaculture is carried out. An assessment of the market trends for the production and fish products consumption is made. This article provides an overview of targeted ingredient selection for balanced fish formulations. The characteristics of the most popular plant origin ingredients and their derivatives in the fish pates production are given. A comprehensive assessment of the biological, energy and nutritional value of plant products is given. Described technological approaches and production methods, the safety of vegetable ingredients. The results of research, technological solutions, substantiation of the choice of ingredients adopted by the developers for the formulations of multicomponent pate are summarized. The use of unclaimed raw materials, leftover fish meat with plant ingredients represents additional profit. Fish pate formulations are the basis for the production of complete, ready-to-eat products. Tests of multicomponent fish and vegetable products confirm their high performance. Pates, balanced in nutritional value, minerals, are a finished product that does not require additional preparation. The review article will generate awareness among the researchers, food technologists for the production of fish products and the general public
Induced magnetism of carbon atoms at the graphene/Ni(111) interface
We report an element-specific investigation of electronic and magnetic
properties of the graphene/Ni(111) system. Using magnetic circular dichroism,
the occurrence of an induced magnetic moment of the carbon atoms in the
graphene layer aligned parallel to the Ni 3d magnetization is observed. We
attribute this magnetic moment to the strong hybridization between C and
Ni 3d valence band states. The net magnetic moment of carbon in the graphene
layer is estimated to be in the range of per atom.Comment: 10 pages, 3 figure
Study of CeNi4Mn by neutron diffraction
We report neutron diffraction measurements on CeNi4Mn, which has recently
been identified as a soft ferromagnet (Tc ~ 140 K) with a sizeable
spin-transport polarization. Our data show conclusively that the Mn atoms
occupy a unique site (4c) in the unit cell, which has the symmetry of the cubic
MgCu4Sn-type structure. We infer a moment of 4.6 mu_B on Mn at 17 K, which is
oriented ferromagnetically along the {101} plane. The amplitude of the Mn
vibrational motion is found to be larger than that of Ce and Ni atoms at all
temperatures, thereby lending support to theoretical prediction of rattling
phonon modes in this compound.Comment: Accepted for publication in Solid State Commu
Impact of self-regulation methods on the psycho-emotional state of future teachers
The authors remark the necessity to develop the psycho-emotional self-assessment and self-regulation capability of future teachers during the period of vocational training at the university. The training program on the development of students' psycho-emotional self-regulation is presented. The possibility of training practice on behavior and activity self-regulation development as one of the phenomena of a person’s mental life is investigated via methods of questioning, operational control of neuropsychic activity (electrocutaneous resistance), and the Luscher tes
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