scholarly journals Nanometric SiC influence on tribological properties of phenolic composite materials

2021 ◽  
Vol 13 (1) ◽  
pp. 131-140
Author(s):  
George PELIN
Keyword(s):  
Composite Materials ◽  
Phenolic Resin ◽  
Point Of View ◽  
The Other ◽  
Two Dimensional ◽  
Carbon Felt ◽  
Different Types ◽  
The Coefficient Of Friction ◽  
Laminated Materials ◽  
Phenolic Composite

This paper presents an experimental study of the influence of nano metric silicon carbide in the composition of phenolic composites on the coefficient of friction. The paper is divided into three distinct parts investigating from a tribological point of view three different types of composite materials based on phenolic resin with three concentrations of nSiC (0.5; 1 and 2% by mass). In the first part, a comparative study of the behavior of phenolic resin was performed, representing the basis for the development of composite materials. In the second part, a study was performed on laminated materials reinforced with two-dimensional fabrics (glass fiber and carbon fiber, respectively). The last part studied two types of ablative phenolic materials based on micronic cork, on one hand, and on carbon felt on the other hand.

scholarly journals CO and OH in the Galactic Center Region

1980 ◽  
Vol 87 ◽  
pp. 111-112
Author(s):  
Junji Inatani ◽  
Nobuharu Ukita
Keyword(s):  
Emission Line ◽  
Intensity Ratio ◽  
Molecular Clouds ◽  
Galactic Center ◽  
Point Of View ◽  
The Other ◽  
Kinetic Temperature ◽  
Two Dimensional ◽  
Center Region ◽  
Dimensional Distribution

The two-dimensional distribution of molecular clouds in the galactic center region has been investigated in the CO 115 GHz line and in the OH 1665 and 1667 MHz lines. As the former is an emission line, we can find molecular clouds without the unavoidable bias to continuum sources which is inherent in a survey of OH absorption lines. Because the CO line is usually optically thick, the brightness temperature of the line is directly related to the kinetic temperature of the cloud. On the other hand, the real optical depth of the OH line can be obtained from the intensity ratio between 1665 and 1667 MHz lines (assuming LTE). From this point of view we have compared the CO and OH observational results.

The diversity of inflectional periphrasis in Persian

2014 ◽  
Vol 51 (2) ◽  
pp. 327-382 ◽  
Author(s):  
OLIVIER BONAMI ◽  
POLLET SAMVELIAN
Keyword(s):  
General Framework ◽  
Point Of View ◽  
The Other ◽  
Inflectional Morphology ◽  
Formal Grammar ◽  
Conjugation System ◽  
Testing Ground ◽  
Other Hand ◽  
Different Types ◽  
A Cell

Modern Persian conjugation makes use of five periphrastic constructions with typologically divergent properties. This makes the Persian conjugation system an ideal testing ground for theories of inflectional periphrasis, since different types of periphrasis can be compared within the frame of a single grammatical system. We present contrasting analyses of the five constructions within the general framework of a lexicalist constraint-based grammatical architecture (Pollard & Sag 1994) embedding an inferential and realizational view of inflectional morphology (Stump 2001). We argue that the perfect periphrase can only be accounted for by assuming that the periphrase literally fills a cell in the inflectional paradigm, and provide a formal account drawing on using valence for exponence. On the other hand, other periphrastic constructions are best handled by using standard tools of either morphology or syntax. The overall conclusion is that not all constructions that qualify as periphrastic inflection from the point of view of typology should receive the same type of analysis in an explicit formal grammar.

scholarly journals Studying the Types, Bases and Features of Sale from the Perspective of Islamic Jurists

2021 ◽  
Vol 9 (SPE3) ◽  
Author(s):  
Morad Jafarzadeh ◽  
Seyed Mohsen Razmi ◽  
Mohammad Reza Kazemi Golvardi
Keyword(s):  
Research Methodology ◽  
Point Of View ◽  
The Other ◽  
View Point ◽  
Fixed Price ◽  
Other Hand ◽  
Islamic Jurisprudence ◽  
Different Types ◽  
Library Method

Sale is known as one of the most widely used words in Islamic jurisprudence. Islamic jurists have each defined the nature, bases and types of sale as one of the specific and important Islamic contracts. Regarding sale, it should be mentioned that in some definitions, the early Imami jurists considered its nature as the exchange of two properties, while the famous Islamic jurists consider its nature as the demand and acceptance, which makes the object of sale the property of the customer and regards the price as the property of the seller. Another point is that, in the definitions of late and contemporary Imami jurists, there is a kind of semantic alteration in the interpretation of sale. From the view point of Islamic jurists, it seems that the elements of possession and ownership in the sale are concepts with wide conceptual scopes, and this is the superiority and distinction of Imami jurists over other jurists regarding the truth of sale. On the other hand, from the point of view of Islamic jurists, there are different types of sale, the most important of which are strict sale, contractual sale, absent sale, harmful sale, credit sale, general sale, deferred sale, gifted (mohabati) sale, debt sale, Morabahe (a sale based on a fixed price), etc. On the other hand, the bases of sale from the perspective of Islamic jurists are: demand and acceptance, buyer and seller, property sold, and price in the sale contract. Also, the features of sale from the point of view of jurists are: the ownership of the sale, the exchange of the sale, the objectivity of the property, the necessity of the sale contract. The research methodology in this paper is descriptive-analytical using the library method.

scholarly journals Social-Epistemic Rhetoric of (Un)certainty in Biomedical and Psychiatric Scientific Academic Writing: a Diatextual Analysis

Human Arenas ◽  
2020 ◽  
Author(s):  
Amelia Manuti ◽  
Giuseppe Mininni ◽  
Rosa Scardigno ◽  
Ignazio Grattagliano
Keyword(s):  
Medical Journal ◽  
Academic Writing ◽  
Analytical Approach ◽  
Point Of View ◽  
The Body ◽  
The Other ◽  
Research Papers ◽  
The World ◽  
Different Types ◽  
Epistemic Rhetoric

Abstract In line with the general aims of scientific textuality, research papers in the biomedical and psychiatric academic domains mostly attempt to demonstrate the validity of their assumptions and to contrast with the sense of uncertainty that sometimes frames their conclusions. Moving from this premise, the present paper aimed to focus on these features and to investigate if and the extent to which biomedical and psychiatric texts convey different social-epistemic rhetoric of uncertainty. In view of this, a qualitative study was conducted adopting diatextual analysis to investigate a corpus of 298 scientific articles taken from the British Medical Journal and from the British Journal of Psychiatry published in 2013. Our analytical approach led to identifying two different types of social-epistemic rhetoric. The first one was mostly oriented to “describing” the world, accounting for the body-mind nexus as conceptualized within the “medical” point of view. On the other hand, the second one was oriented to “interpreting” the world, debating the problematic and critical features of the body-mind relationship as developed within the psychiatry discursive realm.

A NEW METHOD FOR CALCULATING CLASSICAL PERIODIC TRAJECTORIES IN TWO DIMENSIONS

1994 ◽  
Vol 04 (02) ◽  
pp. 251-264 ◽  
Author(s):  
K.T.R. DAVIES
Keyword(s):  
Periodic Orbits ◽  
Gaussian Elimination ◽  
Two Dimensions ◽  
Point Of View ◽  
The Other ◽  
New Method ◽  
Two Dimensional ◽  
Many Body ◽  
Periodic Trajectories ◽  
Dimensional Phase Space

Previously, the monodromy method has been widely used for calculating classical periodic trajectories for a two-dimensional Hamiltonian system, or a four-dimensional phase space. In this paper, the problem is formulated from a different point of view, involving Gaussian-elimination algorithms. Thus, we present a new method for calculating classical periodic orbits, in which each of the basic matrices is of dimension two. Two variants are obtained, one assuming that the period of the motion is fixed and the other assuming that the total energy is fixed. We emphasize the importance of calculating the periodic orbits in as small a dimensionality as possible, an advantage which has implications for generalizations of the theory and methods to outstanding many-body problems in nuclear and atomic physics. Comparisons are made between various approaches.

Use of the mixing length concept to correctly reproduce velocity profiles of turbulent flows

1998 ◽  
Vol 25 (2) ◽  
pp. 232-240 ◽  
Author(s):  
Jean-Loup Robert ◽  
Mohamed Khelifi ◽  
Ahmed Ghanmi
Keyword(s):  
Turbulent Flows ◽  
Turbulent Viscosity ◽  
Three Dimensional ◽  
Velocity Profiles ◽  
Point Of View ◽  
The Other ◽  
Mixing Length ◽  
Two Dimensional ◽  
Constant Viscosity ◽  
Good Agreement

Since the viscous analogy of turbulence was introduced by Reynolds, many formulations for turbulent viscosity have been proposed. One of them, based on the mixing length concept, is investigated here in a broader point of view. The mixing length concept was used to correctly model turbulent velocity profiles for irregular two-dimensional and three-dimensional domains. Two cases of study were investigated for this purpose: a simple two-dimensional aerodynamic problem and a more complicated three-dimensional hydraulic problem. Results showed that the use of a constant viscosity fails to correctly reproduce experimental observations. On the other hand, the use of the mixing length concept leads to a good agreement between the measured and predicted values.Key words: fluid flow, finite element method, mixing length flow theory, turbulent flow, velocity profiles.

Research of Prospective Materials for Military Protective Structures

2015 ◽  
Vol 796 ◽  
pp. 35-42 ◽  
Author(s):  
Stanislav Rolc ◽  
Jan Křesťan ◽  
Daniel Kopkáně ◽  
Jiří Štoller ◽  
Pavel Manas
Keyword(s):  
Composite Materials ◽  
Potential Application ◽  
Point Of View ◽  
Metallic Composite ◽  
Ballistic Resistance ◽  
Ballistic Protection ◽  
Different Types ◽  
Protective Structures ◽  
Internal Gap

Different types of composite materials with potential application in ballistic protection of static objects are discussed and compared in present study. The studied solutions include: 1) the concretes with or without reinforcement, 2) the metallic boxes with internal gap filled with different materials and 3) the ceramics-metallic composite armours. Besides the ballistic resistance, the areal weight and the price are taken into account. The weight of solutions is important in case of static objects mainly from logistic point of view. The proposals of ballistic compositions presented in the study can facilitate the choice of solutions according to specific requests.

A Pattern Measure

10.1068/b2676 ◽  
2000 ◽  
Vol 27 (4) ◽  
pp. 537-547 ◽  
Author(s):  
Allen Klinger ◽  
Nikos A Salingaros
Keyword(s):  
The Other ◽  
Relative Impact ◽  
Two Dimensional ◽  
Human Beings ◽  
Composite Measure ◽  
Composite Measures ◽  
Different Types ◽  
The Aesthetic ◽  
Different Levels

In this paper we propose numerical measures for evaluating the aesthetic interest of simple patterns. The patterns consist of elements (symbols, pixels, etc) in regular square arrays. The measures depend on two characteristics of the patterns: the number of different types of element, and the number of symmetries in their arrangement. We define two complementary composite measures L and C for the degree of pattern in a design, and compute them here for 2 × 2 and 6 × 6 arrays. The results distinguish simple from high-variation cases. We suspect that the measure L corresponds to the degree that human beings intuitively feel a design to be “interesting”, so this model would aid in quantifying the visual connection of two-dimensional designs with viewers. The other composite measure C based on these numerical properties characterizes the extent of randomness of an array. Combining symbol variety with symmetry calculations allows us to employ hierarchical scaling to count the relative impact of different levels of scale. By identifying substructures we can distinguish between organized patterns and disorganized complexity. The measures described here are related to verbal descriptors derived from work by psychologists on responses to visual environments.

Quasistationary current contributions in electronic devices

2007 ◽  
Vol 15 (1) ◽  
Author(s):  
K. Neyts ◽  
J. Beeckman ◽  
F. Beunis
Keyword(s):  
Liquid Crystal ◽  
Electronic Device ◽  
Electronic Devices ◽  
Time Derivative ◽  
The Other ◽  
Dielectric Tensor ◽  
Two Dimensional ◽  
Liquid Crystal Device ◽  
Electrode Current ◽  
Different Types

AbstractIn an electronic device, the current supplied to the electrodes is related to different types of processes inside the device: current density, change in spontaneous polarization, and change in dielectric properties. Two expressions for the electrode current are derived: one is based on the time derivative of the Shockley-Ramo theorem, the other on the time derivative of the dielectric tensor. This result is illustrated for a switching liquid crystal device and a two-dimensional flux tube.

scholarly journals Granting State Aid in the Context of Sustainable Development Principles

Equilibrium ◽  
2014 ◽  
Vol 9 (2) ◽  
pp. 41-54
Author(s):  
Bartosz Bartniczak
Keyword(s):  
Sustainable Development ◽  
Positive Impact ◽  
State Aid ◽  
Point Of View ◽  
Important Task ◽  
The Other ◽  
Financial Instruments ◽  
Other Hand ◽  
Different Types

Implementation of the concept of sustainable development requires the use of a variety of instruments. These instruments may be legal or financial. One of the financial instruments to support sustainable development might be state aid. However, not all aid is beneficial from the point of view of sustainable development. Therefore, an important task is to identify the types of aid that have a positive impact on sustainable development, and on the other hand to show aid which is harmful from the point of sustainable development view. The purpose of this article is to group the principles of sustainable development, in the context of individual order creating sustainable development. The article will also specify the objectives to be achieved by providing different types of support. Then an attempt will be made to answer the question how different types of aid contribute to the achievement of sustainable development.

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