scholarly journals COMPARATIVE ANALYSIS OF DIELECTRIC AND STRUCTURAL CHARACTERISTICS OF THE SAMPLES BASED ON POLYETHYLENETEREPHTALATE

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Dragana Cerović ◽  
Jablan Dojčilović ◽  
Ivan Petronijević ◽  
Dušan Popović
Keyword(s):  
Comparative Analysis ◽  
Dielectric Spectroscopy ◽  
Structural Characteristics ◽  
Polymeric Materials ◽  
Detailed Examination ◽  
Medical Applications ◽  
Dielectric Parameters ◽  
External Influences ◽  
Woven Structures ◽  
Β Relaxation

Widespread use of polymeric materials from the items for daily use to electrical engineering, electronics and medical applications causes a need for their detailed examination under various external influences. Dielectric spectroscopy allows monitoring changes in the structure of polymers under various external influences. In this paper we analyzed β relaxation recorded in polymer woven structures and meshes based on polyethyleneterephtalate. Based on the results obtained, a comparative analysis of dielectric parameters and structural characteristics of the samples was done.

Clinical-neurosonographic parallels of intracranial hemorrhagies in early childhood

2019 ◽  
Vol 22 (6) ◽  
pp. 116-122
Author(s):  
Sh. Sh. Shamansurov ◽  
Sh. H. Saidazizova ◽  
S. O. Nazarova
Keyword(s):  
Early Childhood ◽  
Comparative Analysis ◽  
Subarachnoid Hemorrhage ◽  
Left Hemisphere ◽  
Intracranial Hemorrhage ◽  
Intraventricular Hemorrhage ◽  
Detailed Examination ◽  
Intracranial Hemorrhages ◽  
Risk Of Hemorrhage ◽  
Neurological State

Objective. Conduct a comparative analysis of clinical and neurosonographic indicators of intracranial hemorrhage in infants.Materials and methods. In the clinical part of the study, 68 patients took part in the acute / acute periods of intracranial hemorrhage, which we took for the study on the basis of the Tashkent City Children's Clinical Hospital No1. Gender ratios of which were 69.1% boys (47 children) and 30.9% girls (21 children), from birth to 2 months of life (average age at the time of hemorrhage is 36.28 ± 9.85 days). Diagnostic examination included neurosonography (NSG) of all children in the first 24 hours of the implementation of intracranial hemorrhages on admission to the clinic.Results. According to our study of 68 children with intracranial hemorrhage, it turned out that the average age of morbidity was 36.28 ± 9.85 days (p < 0.001) Neurosonographic indicators stated the presence of parenchymal hemorrhage (right and left hemisphere), SAH (subarachnoid hemorrhage), hemorrhage into the trunk, IVH (intraventricular hemorrhage) II, IVH III. According to neurosonography, parenchymal hemorrhage (right-16 or left hemisphere-21) was observed in 37 patients, SAH and IVH-II 21 (30.9%) patients, IVH III – in 17 (25%) patients, hemorrhage in 3 (4.4%) brain stem of patientsConclusion. Analysis of the implementation of hemorrhage showed that not always small gestational age is the risk of hemorrhage. Cases of less severe changes (27%) on NSG with a coarser clinical picture and vice versa (15%), necessitate (taking into account the severity of the neurological state), a more detailed examination, including visualization (CT, MRI).

scholarly journals Resolving Tensions between Outer Form and Inner Form in Fugue: A Comparative Analysis of J. S. Bach’s Fugue in D minor (WTC I)

2020 ◽  
Vol 26 (3) ◽  
Author(s):  
Sarah Marlowe
Keyword(s):  
Comparative Analysis ◽  
Detailed Examination ◽  
Voice Leading ◽  
Tonal Structure ◽  
Musical Excerpts ◽  
Schenkerian Theory ◽  
Formal Design

This study offers a comparative analysis of J. S. Bach’s Fugue in D minor, from the Well-Tempered Clavier Book I (WTC I). Detailed examination of multiple divergent readings of the same musical excerpts raises important questions about Schenkerian theory and its application to fugal textures. I suggest that analytical discrepancies arise primarily when voice-leading concerns are not completely disentangled from our deeply rooted views of formal design in fugue. In the end, an over-reliance on the details of outer form risks blocking access to the fugue’s inner form. I identify and resolve significant differences that emerge at the foreground in these readings, later considering how a combined view of formal design (outer form) and tonal structure (inner form) resolves ambiguities and enhances our understanding of the work as a whole.

scholarly journals The Fabrics Design Influence in Real and Simulated Drape of Clothing

2020 ◽  
Author(s):  
Rui Miguel ◽  
José Lucas ◽  
Sónia Melo ◽  
Madalena Pereira ◽  
Clara Fernandes ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
Experimental Work ◽  
Structural Characteristics ◽  
Research Work ◽  
Wear Performance ◽  
The Real ◽  
Fashion Products ◽  
Technology And Design

This research work aims to study the influence of the fabrics in the wear performance of clothing. For this, an experimental work was developed with two fabric samples having the same weight/m2, one single and another double, and a jacket prototype. Through a comparative analysis of the mechanical properties, very interesting results was obtained in the evaluation and characterization of the two fabrics performance in designing the same jacket, namely the drape and the corresponded aesthetic fabrics behaviours during wear. The structural characteristics and mechanical properties of each fabric were introduced into Marvelous Designer Version 8 software to simulate the virtual draping of fabrics in a skirt. The analysis of the drape profile of each fabric given by the software and the drape of the real fabrics evaluated in laboratory indicates, coherently, that the double fabric falls less than the single, but in a more harmonious way, what evidence the close links between technology and design of fashion products. Keywords: Fabrics design, Fabrics mechanical properties, Clothing drape, Real and simulated drape

scholarly journals Originals of operating images for generalized problems of unsteady heat conductivity

2019 ◽  
Vol 14 (4) ◽  
pp. 77-86 ◽  
Author(s):  
E. M. Kartashov
Keyword(s):  
Mathematical Models ◽  
Bessel Functions ◽  
Applied Mathematics ◽  
Operational Calculus ◽  
Polymeric Materials ◽  
Thermal Reaction ◽  
Heaviside Step Function ◽  
External Influences ◽  
Wide Range ◽  
Variable Function

A series of operating (Laplace) non-standard images, the originals of which are absent in well-known reference books on operational calculus, are considered. By reducing one of the basic images to the Riemann-Mellin contour integral for the modified Bessel functions and analyzing the corresponding inversion formula using the approaches of the complex variable function theory, an analytical form of the original original is found, which is abrupt in nature with a break point. It is shown that analytical solutions of the corresponding mathematical models using the found originals have a wave character, which is expressed by the presence of the Heaviside step function in the solutions. The latter means that at any time there is a region of physical disturbance to the point of discontinuity and an unperturbed area after the point of discontinuity. The images studied are included in the operational solutions of mathematical models in many areas of applied mathematics. physics, thermomechanics, thermal physics, in particular in the theory of thermal shock of viscoelastic bodies, in the study of the thermal reaction of solids based on the classical Maxwell-Cattaneo-Lykov-Vernott phenomenology, taking into account the final rate of heat propagation. These models are needed to study the thermal reaction of relatively new consolidated structurally sensitive polymeric materials in structures exposed to high-intensity external influences. The analytical relations obtained for the originals and the original improper integrals resulting from them, containing combinations of Bessel functions, can be used in the general methodology of constructing and applying various mathematical models in a wide range of external influences on materials in many fields of science and technology.

Improving photoluminescence, optical and electrical characteristics of PMMA films with gamma irradiation

2021 ◽  
Author(s):  
M.F. Zaki ◽  
Nasser Shubayr ◽  
Reda M Radwan ◽  
Yazeed Alashban
Keyword(s):  
Gamma Irradiation ◽  
Polymeric Materials ◽  
Advanced Materials ◽  
Strong Impact ◽  
Electrical Characteristics ◽  
Electrical Measurements ◽  
Indirect Transition ◽  
Dielectric Parameters ◽  
Vis Spectroscopy ◽  
Gamma Irradiated

Abstract Polymeric materials are macromolecules, essentially a combination of numerous repeated subunits. Polymers are innovative and advanced materials that currently have a strong impact on our daily lives. In recent years, polymer use has been prominent due to the materials’ distinctive properties; thus, they entered different fields of science, technology and industrial-biomedical applications.The improvement of photoluminescence, optical and electrical characteristics of non-conducting Poly(methyl methacrylate) (PMMA) films was studied. Upon gamma irradiation of various doses, the photophysical and electrical properties of PMMA films were investigated using photoluminescence spectroscopy, ultraviolet–visible (UV-Vis) spectroscopy and the LCR Meter Bridge Circuit technique. The fluorescent response improved the photoluminescence (PL) spectral emission peaks according to gamma values. Strong fluorescence peaks appeared with the highest gamma dose. The UV–Vis results revealed a significant red-shift in the absorption edge as gamma doses increased. This shift exhibits a continuous decrease in the energy band gap values (from 3.50 to 2.60 eV for direct transition and from 3.05 to 1.55 eV for indirect transition). This was due to the formation of carbon clusters, which led to an increase in the electrical conductivity and improved the dielectric parameters of the irradiated PMMA films. Among a variety of measurements presented and discussed in the present study, the electrical measurements showed improved electrical characteristics of gamma-irradiated PMMA films.

scholarly journals Incremental residential densification and urban spatial justice: The case of England between 2001 and 2011

Urban Studies ◽  
2020 ◽  
pp. 004209802093696
Author(s):  
Peter Bibby ◽  
John Henneberry ◽  
Jean-Marie Halleux
Keyword(s):  
Comparative Analysis ◽  
Social Equity ◽  
Detailed Examination ◽  
Residential Development ◽  
Substantial Contribution ◽  
Lower Income ◽  
Urban Experience ◽  
Spatial Justice ◽  
Residential Space ◽  
The City

Study of the relation between urban density and social equity has been based mostly upon comparative analysis at the city level. It therefore fails to address variations in intra-urban experience and sheds no light on the process of urban densification. Incremental residential development is particularly poorly recorded and under-researched, yet cumulatively it makes a substantial contribution to the supply of dwellings. The article presents a detailed examination of this form of development in England between 2001 and 2011, and considers its impact on urban spatial justice. We find that the incidence of soft residential densification was very uneven. It had disproportionately large effects on neighbourhoods that were already densely developed and that were characterised by lower income households with access to relatively little residential space. It thus contributed to an increase in the level of inequality in the distribution of residential space, increasing socio-spatial injustice.

“Premit” System for Space Reticulated Structures

2003 ◽  
Vol 18 (1) ◽  
pp. 31-45 ◽  
Author(s):  
Vincenzo Dipaola ◽  
Giuseppe Prete
Keyword(s):  
Comparative Analysis ◽  
Morphological Study ◽  
Structural Characteristics ◽  
Economic Valuation ◽  
Construction Process ◽  
General Introduction ◽  
Geometrical Shapes ◽  
Original Construction

This is the first of three papers where we present the applicable potential of an original construction process for steel space grids, named PREMIT System. After a general introduction, we explain the geometrical and structural characteristics of the proposed System. We carry out a morphological study of the principal typological schemes to which it is possible to extend the applicable field of the System. Moreover, we deduce some useful criteria for the static-economic valuation through a comparative analysis among the more frequently employed geometrical shapes.

Sign in / Sign up

Export Citation Format

Share Document