Formation of Metal Complexes with the Arsenazo I and Arsenazo III Reagents as Functions of the Medium Acidity

A function is given for the medium acidity in which metals react with arsenazo I and arsenazo III, as dependent upon the solubility product of the metal hydroxides

Models of spin-orbit coupled oligomers

We address the stability and dynamics of eigenmodes in linearly-shaped strings (dimers, trimers, tetramers, and pentamers) built of droplets of a binary Bose-Einstein condensate (BEC). The binary BEC is composed of atoms in two pseudo-spin states with attractive interactions, dressed by properly arranged laser fields, which induce the (pseudo-) spin-orbit (SO) coupling. We demonstrate that the SO-coupling terms help to create eigenmodes of particular types in the strings. Dimer, trimer, and pentamer eigenmodes of the linear system, which correspond to the zero eigenvalue (EV, alias chemical potential) extend into the nonlinear ones, keeping an exact analytical form, while tetramers do not admit such a continuation, because the respective spectrum does not contain a zero EV. Stability areas of these modes shrink with the increasing nonlinearity. Besides these modes, other types of nonlinear states, which are produced by the continuation of their linear counterparts corresponding to some nonzero EVs, are found in a numerical form (including ones for the tetramer system). They are stable in nearly entire existence regions in trimer and pentamer systems, but only in a very small area for the tetramers. Similar results are also obtained, but not displayed in detail, for hexa- and septamers.Comment: Chaos, in pres

Unexpected Scaling of the Performance of Carbon Nanotube Transistors

We show that carbon nanotube transistors exhibit scaling that is qualitatively different than conventional transistors. The performance depends in an unexpected way on both the thickness and the dielectric constant of the gate oxide. Experimental measurements and theoretical calculations provide a consistent understanding of the scaling, which reflects the very different device physics of a Schottky barrier transistor with a quasi-one-dimensional channel contacting a sharp edge. A simple analytic model gives explicit scaling expressions for key device parameters such as subthreshold slope, turn-on voltage, and transconductance.Comment: 4 pages, 4 figure

Impact of IT on management and humans in modern conditions

The introduction of IT changes the organizational structure and all the elements of management processes, particularly the way we manage organizations. The problem is the fact that information technology is not adequately implemented in all the parts of the business process. Specifically, it is applied to the operatively executive, administrative, accounting jobs, archiving, retrieval and selection of data for planning and analysis, and its implementation is lagging behind in leadership and management. This paper aims to highlight the impact of IT on the management process, i.e. on people as the most valuable potential of each organization

Structural characterization of Kalsilite

Thermally induced phase transformation of K-exchange LTA zeolite is followed in the range from room temperature to 1500 ºC. The frameworks collapse into amorphous intermediate products after heating between 600 and 650 °C. Prolonged heating of the intermediate product over 1100 °C results directly in formation a kalsilite [a= 8.1095 (4) Å, b =12.824 (4) Å, c =7.0674 (4) Å, β =115.89 °(3)]. The crystale phases of kalsilite in temperature range between 700 and 1500°C was investigated by X-ray powder analyses

Mechanism of Ambipolar Field-Effect Carrier Injections in One-Dimensional Mott Insulators

To clarify the mechanism of recently reported, ambipolar carrier injections into quasi-one-dimensional Mott insulators on which field-effect transistors are fabricated, we employ the one-dimensional Hubbard model attached to a tight-binding model for source and drain electrodes. To take account of the formation of Schottky barriers, we add scalar and vector potentials, which satisfy the Poisson equation with boundary values depending on the drain voltage, the gate bias, and the work-function difference. The current-voltage characteristics are obtained by solving the time-dependent Schr\"odinger equation in the unrestricted Hartree-Fock approximation. Its validity is discussed with the help of the Lanczos method applied to small systems. We find generally ambipolar carrier injections in Mott insulators even if the work function of the crystal is quite different from that of the electrodes. They result from balancing the correlation effect with the barrier effect. For the gate-bias polarity with higher Schottky barriers, the correlation effect is weakened accordingly, owing to collective transport in the one-dimensional correlated electron systems.Comment: 21 pages, 10 figures, to appear in J. Phys. Soc. Jp

Detection and genotyping of classical swine fever virus isolates in Serbia

Classical swine fever (CSF) is a highly contagious disease of pigs leading to significant economic losses worldwide. Classical swine fever virus can be classified into three genogroups, each consisting of three or four subgroups. However, there is a lack of knowledge on the genotypes of CSFV isolates in Republic of Serbia. This study, based on the sequences analysis of partial E2 gene and 5' non coding region (NCR) of 15 CSFV isolated during 2006-2008 from domestic pigs, revealed that all were clustered into genetic group 2.3. Additionally, we showed that the two most often used real time RT-PCR assays were able to detect all local CSF viruses circulated in Serbia in the last years during intensive vaccination campaign against CSF. [Projekat Ministarstva nauke Republike Srbije, br. TR 31075 and TR 31088

Influence of MoO3 on sintering temperature of mechanically activated MgO-Al2O3-SiO2 system

Cordierite, 2MgO⋅2Al2O3⋅5SiO2, is a very attractive high-temperature ceramic material, due to its outstanding electrical characteristics, such as the low temperature expansion coefficient, low dielectric constant and good mechanical properties. In order to accelerate the process of sintering, 5.00 mass% MoO3 has been added to the starting mixtures. The mechanical activation of the starting mixtures was performed in a high energy ball mill during 0-80 minutes. The particle size analysis (PSA) was employed in order to determine the changes in the particle size of the mechanically treated powders. The phase composition of the starting powders and sintered samples was analyzed by the X-ray diffraction method. Furthermore, differential thermal analysis (DTA) was used in order to determine characteristic temperatures within the system during heating. Based on the obtained DTA results, it was established that mechanical activation has some influence on temperatures of phase transitions. Sintering process was performed in air at 1200oC for 2h

Characterization of Tamnava clay by X-ray powder diffraction method

The X-ray powder diffraction method on a polycrystalline sample is one of the basic methods used in the characterization of aluminosilicate minerals.The clay minerals represent a complex system, in which more than one phase is present.The main problems in analysis of clay minerals is weak crystallinity, preferential orientation, as well as the appearance of asymmetry.In this paper are presented the results of analysis of smectic type clay from Tamnava area. For investigation was use the method of X-ray powder diffraction and SEM analysis.IX Serbian Ceramic Society Conference - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts; September 20-21, 2021; Belgrad

Structural and Chemical Properties of Zeolite FAU-Topology

Zeolite FAU is a synthetic product formed by various process of synthesis. The unit cell of zeolite of FAU topology contains 192 (Si, Al) O4 - tetrahedra, it has tesseral symmetry and the unit cell parameter is ~ 25 A Key words: feldspar, hyalophane, crystalochemical properties.The FAU aluminosilicate network consists of a series of β-cages, which are tetrahedrally connected via D6R secondary building units. On this paper are presented the results of structural and crystalochemical analysis zeolite FAU topology. The SEM/EDS methods and X-ray powder diffraction analysis are useful for analysis.IX Serbian Ceramic Society Conference - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts; September 20-21, 2021; Belgrad