Spectral Dependence of the Degree of Localization in a 1D Disordered System with a Complex Structural Unit

It is proposed to conduct selective extraction of conditioned and substandard ore of an exploded complex structural unit using an improved mining aggregate equipped with a classification grid with rotary grates and a crusher with an adjustable size of the discharge gap, which will allow one of the basic principles of resource saving - not to crush anything superfluous. The proposed technical and technological solution will significantly increase the productivity of mining operations, increase the extraction of mineral raw materials from the developed complex structural unit due to separation from substandard ore enriched with a useful component of ore fines, as well as reduce dusting and reduce the loss of mineral raw materials from blowing and spilling during loading and transportation.

Download Full-text

Model of complex structural unit in condensed media

Chemistry and Technology of Fuels and Oils ◽

10.1007/bf00725686 ◽

1987 ◽

Vol 23 (5) ◽

pp. 248-250

Author(s):

N. N. Krasnogorskaya ◽

F. G. Unger ◽

L. N. Andreeva ◽

A. R. Gabdikeeva ◽

Yu. F. Sokov ◽

...

Keyword(s):

Structural Unit ◽

Condensed Media ◽

Complex Structural Unit ◽

Complex Structural

Download Full-text

Decagonal random tilings and their quasi-unit cell cluster coverings

International Journal of Geometric Methods in Modern Physics ◽

10.1142/s0219887821501711 ◽

2021 ◽

pp. 2150171

Author(s):

Juan García Escudero

Keyword(s):

Electron Microscopy ◽

Structural Unit ◽

Cell Cluster ◽

Penrose Tiling ◽

Decagonal Quasicrystals ◽

Different Types ◽

Complex Structural ◽

Random Tilings ◽

Microscopy Images ◽

Bow Tie

Electron microscopy images of decagonal quasicrystals obtained recently have been shown to be related to cluster coverings with a Hexagon–Bow–Tie decagon as single structural unit. Most decagonal phases show more complex structural orderings than models based on deterministic tilings like the Penrose tiling. We analyze different types of decagonal random tilings and their coverings by a Hexagon–Bow–Tie decagon.

Download Full-text

The structure of a near Σ=27 tilt grain boundary in Ge

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100121478 ◽

1992 ◽

Vol 50 (1) ◽

pp. 214-215

Author(s):

Stuart McKernan ◽

C. Barry Carter

Keyword(s):

Grain Boundary ◽

Grain Boundaries ◽

Structural Unit ◽

Perfect Crystal ◽

Boundary Plane ◽

Boundary Structure ◽

Structural Units ◽

Grain Boundary Plane ◽

Grain Boundary Structure ◽

Complex Structural

The modeling of tilt grain boundaries in terms of repeating structural units of varying separation is now a well established concept. High-resolution electron microscope (HREM) images of different tilt grain boundaries in many materials display a qualitative similarity of atomic configurations of the grain boundary structure. These boundaries are frequently described in terms of characteristic structural units, which may be separated from each other by regions of ‘perfect’ crystal (as, for example, in low-angle grain boundaries), or may be contiguous, forming ordered arrays of the structural units along the boundary. In general there will be a different arrangement of the structural units or an arrangement of different structural units, according to the precise geometry of the particular grain boundary. The structure of some special grain boundaries has been examined and these are found to exist in several different configurations, depending on the orientation of the grain boundary plane among other parameters. Symmetry-related symmetric tilt grain boundaries and asymmetric tilt grain boundaries with one grain having a prominent, low-index facet, are commonly observed, low-energy configurations. Structural multiplicity of these configurations along the same grain boundary has been observed in some systems. Defects in the perfect ordering of the structural units may be caused by deviations of the grain boundary plane away from the perfect tilt orientation. Deviations of grain boundary structure away from the exact orientation will also produce defects in the repeating structural unit configuration. These deviations may have a regular and well-defined structure, producing a more complex structural unit.

Download Full-text

Study of the Impact of Nonionic Additives on the Composition and Structure of Petroleum Dispersed Systems by IR Spectroscopy

Processes ◽

10.3390/pr9030553 ◽

2021 ◽

Vol 9 (3) ◽

pp. 553

Author(s):

Alfiya I. Lakhova ◽

Aliya G. Safiulina ◽

Galiya G. Islamova ◽

Abdykerim B. Amansaryev ◽

Ilzat I. Salakhov ◽

...

Keyword(s):

Component Composition ◽

Solvation Shell ◽

Heavy Petroleum ◽

The Core ◽

Dispersed System ◽

Composition And Structure ◽

Complex Structural Unit ◽

Unsaturated Carboxylic Acids ◽

Complex Structural ◽

The Impact

The article describes a technique for obtaining a quantitative assessment of the composition and structure of the petroleum dispersed system (PDS) and its individual structural formations based on the data of the component composition and infrared spectroscopy. In the PDS of heavy petroleum feedstock modified with a mixture of unsaturated carboxylic acids and four atomic alcohols, the components of the core and the inner solvation shell are different in structure. The degree of affinity of the components of the inner and outer solvation shells of the complex structural unit (CSU), as well as that of the outer solvation shell and the hydrocarbon components of the dispersion medium, increases. Nonionic additives are involved, to a greater degree, in structuring the solvation shell of the CSU and also increase the degree of its affinity with the hydrocarbon components, which leads to an increase in the dispersion of the system and a decrease in its mobility.

Download Full-text

The Collagenic Molecular Structural Unit of Solid State Complexes

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100066449 ◽

1971 ◽

Vol 29 ◽

pp. 478-479

Author(s):

Kenneth M. Richter ◽

John A. Schilling

Keyword(s):

Molecular Weight ◽

Solid State ◽

Structural Unit ◽

X Ray Diffraction ◽

X Ray ◽

Naoh Treatment

The structural unit of solid state collagen complexes has been reported by Porter and Vanamee via EM and by Cowan, North and Randall via x-ray diffraction to be an ellipsoidal unit of 210-270 A. length by 50-100 A. diameter. It subsequently was independently demonstrated by us in dog tendon, dermis, and induced complexes. Its detailed morphologic, dimensional and molecular weight (MW) aspects have now been determined. It is pear-shaped in long profile with m diameters of 57 and 108 A. and m length of 263 A. (Fig. 1, tendon, KMnO4 fixation, Na-tungstate; Fig. 2a, schematic of unit in long, C, and x-sectional profiles of its thin, xB, and bulbous, xA portions; Fig. 2b, tendon essentially unmodified by ether and 0.4 N NaOH treatment, Na-tungstate). The unit consists of a uniquely coild cable, c, of ṁ 22.9 A. diameter and length of 2580-3316 A. The cable consists of three 2nd-strands, s, each of m 10.6 A.

Download Full-text

The course as important structural unit in the system of teaching practiced in the rhythmical gymnastics

PsycEXTRA Dataset ◽

10.1037/e548052012-272 ◽

2007 ◽

Author(s):

D. Tsopani ◽

G. Dallas ◽

N. Tasika

Keyword(s):

Structural Unit

Download Full-text

Strongly Coupled Redox-Linked Conformational Switching at the Active Site of the Non-Heme Iron-Dependent Dioxygenase, TauD

10.26434/chemrxiv.9461462 ◽

2019 ◽

Author(s):

Christopher John ◽

Greg M. Swain ◽

Robert P. Hausinger ◽

Denis A. Proshlyakov

Keyword(s):

Active Site ◽

Structural Model ◽

Heme Iron ◽

Chemical Transformations ◽

Experimental Conditions ◽

Strongly Coupled ◽

Non Heme Iron ◽

Reversible Redox ◽

Wide Range ◽

Complex Structural

2-Oxoglutarate (2OG)-dependent dioxygenases catalyze C-H activation while performing a wide range of chemical transformations. In contrast to their heme analogues, non-heme iron centers afford greater structural flexibility with important implications for their diverse catalytic mechanisms. We characterize an <i>in situ</i> structural model of the putative transient ferric intermediate of 2OG:taurine dioxygenase (TauD) by using a combination of spectroelectrochemical and semi-empirical computational methods, demonstrating that the Fe (III/II) transition involves a substantial, fully reversible, redox-linked conformational change at the active site. This rearrangement alters the apparent redox potential of the active site between -127 mV for reduction of the ferric state and 171 mV for oxidation of the ferrous state of the 2OG-Fe-TauD complex. Structural perturbations exhibit limited sensitivity to mediator concentrations and potential pulse duration. Similar changes were observed in the Fe-TauD and taurine-2OG-Fe-TauD complexes, thus attributing the reorganization to the protein moiety rather than the cosubstrates. Redox difference infrared spectra indicate a reorganization of the protein backbone in addition to the involvement of carboxylate and histidine ligands. Quantitative modeling of the transient redox response using two alternative reaction schemes across a variety of experimental conditions strongly supports the proposal for intrinsic protein reorganization as the origin of the experimental observations.

Download Full-text