An Attempt at a Rational Classification of the Principal Accelerators of Vulcanization

1929 ◽  
Vol 2 (3) ◽  
pp. 356-361
Author(s):  
G. Martin ◽  
R. Thiollet
Keyword(s):  
Mechanical Properties ◽  
The Other ◽  
Different Temperatures ◽  
Points Of View ◽  
Time Required ◽  
Rational Classification

Abstract AT the present time there are many accelerators on the market for the vulcanization of rubber, but it is often difficult to choose among them those best suited for a required purpose. Accelerators are often classed as slow medium, rapid and ultra rapid. These brief terms are entirely unsatisfactory for characterizing clearly the properties of these properties, and it frequently happens that two accelerators which have been placed together in one class behave in reality in very different ways and are not entirely replaceable one by the other. The object of this study is to establish a rational classification of the principal accelerators of vulcanization, which is based not only on their activity but also on their other important characteristics. The following points will be considered in their order: (1) The time required for the fixation of mixtures at different temperatures. (2) The time required to bring about vulcanization giving the maxima mechanical properties at different temperatures. (3) Aging. (4) These three points of view will be completed by a study of the plasticizing power and of the influence of different charges on the action of the accelerators.

An Attempt at a Rational Classification of the Principal Accelerators of Vulcanization. II. A Study of the Time Required for Vulcanization Giving the Maxima Physical Properties at Different Temperatures

1930 ◽  
Vol 3 (1) ◽  
pp. 38-50
Author(s):  
R. Thiollet ◽  
G. Martin
Keyword(s):  
Physical Properties ◽  
Prolonged Heating ◽  
Physical Quality ◽  
Gutta Percha ◽  
Different Temperatures ◽  
Time Required ◽  
Rational Classification

Abstract We have attempted to classify the principal accelerators of vulcanization according to their chief characteristics which are the following: (1) Time necessary for the fixation of mixtures at different temperatures. (2) Times required at different temperatures to obtain vulcanization giving the maxima physical properties. (3) Aging. The first of these 3 items has been treated in Caoutchouc et Gutta-Percha (April, 1929) and we have shown how accelerators can be classified by their “precocity” of action; that is to say, by the rapidity with which they “fix” mixtures at different temperatures. The mixture being fixed, vulcanization continues and the physical quality of the rubber improves. It thus reaches a maximum, then diminishes upon too prolonged heating. In this second study we have attempted to determine the following points: (1) At a given temperature, how long a period of vulcanization is required to impart to the mixtures their maxima physical properties? (2) Within the range of temperatures, which temperature gives the optima physical properties?

scholarly journals The system of points of view in Vasily Shukshin's short stories

2021 ◽  
Vol 27 (3) ◽  
pp. 148-154
Author(s):  
Natalia A. Guz ◽  
Yulia G. Babicheva
Keyword(s):  
Short Stories ◽  
Scientific Understanding ◽  
Point Of View ◽  
The Other ◽  
Frequent Change ◽  
History Of ◽  
Points Of View ◽  
First Time

The purpose of the work is to explore the point of view in Vasily Shukshin's short stories in its systematic and diverse manifestation. Topicality is provided by the exceptional significance of this category in narratology. The study of the point of view based on the material of short stories by Vasily Shukshin has been conducted for the first time. The article briefly traces the history of scientific understanding of the category of point of view in foreign and Russian philology and notes the variety of approaches and definitions in the formulation of the concept. The authors use the classification of Boris Uspenskij for analysis and consider the point of view in Vasily Shukshin's short stories in psychological, ideological (evaluative), spatial-temporal and phraseological terms. The positions of Boris Korman, Yuri Lotman, Wolf Schmid and Franz Karl Stanzel also take into account. The authors note the features of Vasily Shukshin's narration that affect the expression of the point of view in the text. Vasily Shukshin's short stories are characterised by a dynamic and frequent change of points of view, which indicates the technique of “montageˮ and similarities in this regard with cinematic techniques. The conclusions generalise the variety of ways and forms of expression of the point of view in the studied artistic material. The point of view in the considered stories is characterised by variability in the correlation of subjects of speech and subjects of consciousness, alternation of external and internal points of view, mutual transitions from one to the other, text interference and other hybrid phenomena.

Human Rights and Reformist Islam

2020 ◽  
pp. 87-168
Author(s):  
Mohsen Kadivar
Keyword(s):  
Human Rights ◽  
Gender Discrimination ◽  
The Other ◽  
Religious Discrimination ◽  
Islamic Tradition ◽  
The One ◽  
The Relationship ◽  
Traditional Islam ◽  
Rational Classification

This chapter takes the form of a transcribed interview and consists of a reflection on the relationship between traditional Islam and the Universal Declaration of Human Rights and its related covenants, and provides a solution for making traditional Islam compatible with the idea of human rights. It critiques traditional Islamic approaches to the question of compatibility between human rights and Islam and argues instead for their reconciliation from the perspective of a reformist Islam. The chapter focuses on six controversial case studies: religious discrimination; gender discrimination; slavery; freedom of religion; punishment of apostasy; and arbitrary or harsh punishments. Explaining the strengths of structural ijtihad, the author’s approach is based on the rational classification of Islamic teachings as temporal or permanent on the one hand, and four criteria of being Islamic on the other: reasonableness, justice, morality and efficiency. In the chapter, all of the verses of the Qur’an and the Hadith that are problematic in relation to the notion of human rights are abrogated rationally according to these criteria. The result is a powerful, solutions-based argument based on reformist Islam – providing a scholarly bridge between modernity and Islamic tradition in relation to human rights.

Wear behaviour of polyurethane composites with respect to the other mechanical properties

2014 ◽  
Vol 11 (2) ◽  
pp. 139-146
Author(s):  
Anna Porąbka ◽  
Vasiliki-Maria Archodoulaki ◽  
Wolfgang Molnar ◽  
Jadwiga Laska
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Physical And Mechanical Properties ◽  
The Other ◽  
Wear Behaviour ◽  
Matrix Composites ◽  
Different Temperatures ◽  
Polyurethane Composites ◽  
Polyurethane Matrix ◽  
Properties Of Composites

Two series of polyurethane matrix composites were prepared. As generally resistant to wear, the PUs can be used as matrices for wear protective and load-bearing composites. The objective of this study was to compare the mechanical properties of composites containing 5% vol. of selected ceramic particles, and unmodified PUs. The effect of various particles on physical and mechanical properties was studied. The results showed that the mechanical properties changed compared to reference materials: modulus improved in certain materials and in different temperatures, revealing the favourable influence of FA and SiO2 particles. In turn, Rm and wear resistance decreased with the type and shape of filler.

Human Rights and Reformist Islam

2020 ◽  
Author(s):  
Mohsen Kadivar ◽  
Mirjam Künkler
Keyword(s):  
Human Rights ◽  
Gender Discrimination ◽  
Religion And Politics ◽  
The Other ◽  
Religious Discrimination ◽  
Islamic Tradition ◽  
The One ◽  
Work Up ◽  
Rational Classification

Human Rights and Reformist Islam critiques traditional Islamic approaches to the question of compatibility between human rights and Islam and argues instead for their reconciliation from the perspective of a reformist Islam. The book focuses on six controversial case studies: religious discrimination; gender discrimination; slavery; freedom of religion; punishment of apostasy; and arbitrary or harsh punishments. Explaining the strengths of structural ijtihad, Mohsen Kadivar’s approach is based on the rational classification of Islamic teachings as temporal or permanent on the one hand, and four criteria of being Islamic on the other: reasonableness, justice, morality and efficiency. In the book, all of the verses of the Qur’an and the Hadith that are problematic in relation to human rights are abrogated rationally according to these criteria. The result is a powerful, solutions-based argument based on reformist Islam – providing a scholarly bridge between modernity and Islamic tradition in relation to human rights. The book’s fourteen chapters are organized in five sections, including freedoms of belief, religion and politics, women’s rights, and slavery in contemporary Islam. Adding an extensive new introduction and annotations throughout the text from Kadivar bring the work up-to-date and place it in its academic and public contexts. In the introduction, the author critically compares his approach to Islam and human rights with those of five leading contemporary scholars: Mahmoud M. Taha, Abdullahi A. an-Na’im, Ann E. Mayer, Mohammad M. Shabestari and Abdulaziz A. Sachedina.

Influence of the Temperature of Crystallization on the Melting of Crystalline Rubber

1941 ◽  
Vol 14 (3) ◽  
pp. 544-545 ◽  
Author(s):  
Norman Bekkedahl ◽  
Lawrence A. Wood
Keyword(s):  
Mechanical Properties ◽  
Crystalline Material ◽  
X Ray Diffraction ◽  
Volume Increase ◽  
X Ray ◽  
Different Temperatures ◽  
Quantitative Results ◽  
Rate Of Heating ◽  
One Year ◽  
Time Required

Abstract Data presented in this communication show an instance in which melting of a crystalline material is very much dependent on the temperature at which the crystals have been formed. It is well known that many substances in which crystallization is relatively slow can be crystallized at different temperatures in a range below the melting point, but no effect of the crystallization temperature on the temperature of melting seems to have been previously reported. The quantitative results for crystalline rubber, the material under investigation, are shown in Figure 1. The crystallization of unvulcanized rubber in the unstretched state has been found to occur at temperatures between about −40° C and 13° C. The time required for crystallization is about one year at 13° C, about ten days at 0° C, and a few hours at −20° C. Below −40° C the mobility is presumably insufficient for the formation of crystals. Crystallization and fusion are accompanied by changes in volume, heat capacity, light absorption, birefringence, x-ray diffraction, and mechanical properties such as hardness. The volume decreases about 2.5 per cent on crystallization, and the magnitude of the change is little influenced, if at all, by the temperature. Fusion, as measured by the volume increase, is found to be independent of the rate of heating, and to occur over a range of five or ten degrees.

Consistency in Latency Measurements and Interpretation of ABR Tracings

1997 ◽  
Vol 6 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Wayne O. Olsen ◽  
Terri L. Pratt ◽  
Christopher D. Bauch
Keyword(s):  
The Other

Multichannel ABR recordings for 30 otoneurologic patients were reviewed independently by three audiologists to assess interjudge consistency in determining absolute latencies and overall interpretation of ABR results. Four months later, the tracings were reviewed a second time to evaluate intrajudge consistency in interpretation of ABR waveforms. Interjudge agreement in marking latencies for waves I, III, and V within 0.2 ms was on the order of 90% or better. Intrajudge consistency was slightly higher. Only rarely did inter- or intrajudge differences in latency measurements exceed 0.3 ms. Agreement in overall interpretation of ABR results as "normal" or "abnormal" was unanimous for 90% of the patients. Across pairs of judges, the agreement for "normal" and "abnormal" classification of the ABR tracings was 97%. Intrajudge consistency for "normal" and "abnormal" categorization of the ABR results was 100% for one judge, 97% for the other two judges.

RHYNCHOLITES AND THE PROBLEM OF NARROW AND BROAD CONCEPTION OF TAXONS

2018 ◽  
pp. 12-17 ◽  
Author(s):  
I. R. Khuzina ◽  
V. N. Komarov
Keyword(s):  
Sexual Dimorphism ◽  
Morphological Characteristics ◽  
Mass Scale ◽  
Individual Variability ◽  
Point Of View ◽  
The Other ◽  
New Taxon ◽  
Artificial System ◽  
Broad Understanding

The paper considers a point of view, based on the conception of the broad understanding of taxons. According to this point of view, rhyncholites of the subgenus Dentatobeccus and Microbeccus are accepted to be synonymous with the genus Rhynchoteuthis, and subgenus Romanovichella is considered to be synonymous with the genus Palaeoteuthis. The criteria, exercising influence on the different approaches to the classification of rhyncholites, have been analyzed (such as age and individual variability, sexual dimorphism, pathological and teratological features, degree of disintegration of material), underestimation of which can lead to inaccuracy. Divestment of the subgenuses Dentatobeccus, Microbeccus and Romanovichella, possessing very bright morphological characteristics, to have an independent status and denomination to their synonyms, has been noted to be unjustified. An artificial system (any suggested variant) with all its minuses is a single probable system for rhyncholites. The main criteria, minimizing its negative sides and proving the separation of the new taxon, is an available mass-scale material. The narrow understanding of the genus, used in sensible limits, has been underlined to simplify the problem of the passing the view about the genus to the other investigators and recognition of rhyncholites for the practical tasks.

An Enhanced Technique for Classification of Fruits using Shape Color and Texture Features

2017 ◽  
Vol 7 (7) ◽  
pp. 408
Author(s):  
Yashpal Jitarwal ◽  
Tabrej Ahamad Khan ◽  
Pawan Mangal
Keyword(s):  
Image Processing ◽  
Texture Features ◽  
Automatic Classification ◽  
Processing Technique ◽  
Image Processing Technique ◽  
Advance Technique ◽  
Time Required ◽  
Fruit Sorting ◽  
Human Inspection

In earlier times fruits were sorted manually and it was very time consuming and laborious task. Human sorted the fruits of the basis of shape, size and color. Time taken by human to sort the fruits is very large therefore to reduce the time and to increase the accuracy, an automatic classification of fruits comes into existence.To improve this human inspection and reduce time required for fruit sorting an advance technique is developed that accepts information about fruits from their images, and is called as Image Processing Technique.

Physical and Mechanical Properties of Tenun Pahang Fabrics using Alternative Yarns

2016 ◽  
Vol 13 (2) ◽  
pp. 67
Author(s):  
Engku Liyana Zafirah Engku Mohd Suhaimi ◽  
Jamil Salleh ◽  
Suzaini Abd Ghani ◽  
Mohamad Faizul Yahya ◽  
Mohd Rozi Ahmad
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
The Other ◽  
Silk Fabrics ◽  
Recovery Angle ◽  
Made In

An investigation on the properties of Tenun Pahang fabric performances using alternative yarns was conducted. The studies were made in order to evaluate whether the Tenun Pahang fabric could be produced economically and at the same time maintain the fabric quality. Traditional Tenun Pahang fabric uses silk for both warp and weft. For this project, two alternative yarns were used which were bamboo and modal, which were a little lower in cost compared to silk. These yarns were woven with two variations, one with the yarns as weft only while maintaining the silk warp and the other with both warp and weft using the alternative yarns. Four (4) physical testings and three (3) mechanical testings conducted on the fabric samples. The fabric samples were evaluated including weight, thickness, thread density, crease recovery angle, stiffness and drapability. The results show that modal/silk and bamboo silk fabrics are comparable in terms of stiffness and drapability, hence they have the potential to replace 100% silk Tenun Pahang.

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