scholarly journals Organocatalysis: Key Trends in Green Synthetic Chemistry, Challenges, Scope towards Heterogenization, and Importance from Research and Industrial Point of View

2014 ◽  
Vol 2014 ◽  
pp. 1-35 ◽  
Author(s):  
Isak Rajjak Shaikh
Keyword(s):  
Chemical Reaction ◽  
Organic Molecule ◽  
Industrial Applications ◽  
Point Of View ◽  
Low Molecular Weight ◽  
Research Directions ◽  
Research Findings ◽  
Green Synthetic Chemistry ◽  
Definition Of ◽  
Inorganic Supports

This paper purports to review catalysis, particularly the organocatalysis and its origin, key trends, challenges, examples, scope, and importance. The definition of organocatalyst corresponds to a low molecular weight organic molecule which in stoichiometric amounts catalyzes a chemical reaction. In this review, the use of the term heterogenized organocatalyst will be exclusively confined to a catalytic system containing an organic molecule immobilized onto some sort of support material and is responsible for accelerating a chemical reaction. Firstly, a brief description of the field is provided putting it in a green and sustainable perspective of chemistry. Next, research findings on the use of organocatalysts on various inorganic supports including nano(porous)materials, nanoparticles, silica, and zeolite/zeolitic materials are scrutinized in brief. Then future scope, research directions, and academic and industrial applications will be outlined. A succinct account will summarize some of the research and developments in the field. This review tries to bring many outstanding researches together and shows the vitality of the organocatalysis through several aspects.

scholarly journals Deep Learning for Historical Document Analysis and Recognition—A Survey

2020 ◽  
Vol 6 (10) ◽  
pp. 110
Author(s):  
Francesco Lombardi ◽  
Simone Marinai
Keyword(s):  
Deep Learning ◽  
State Of The Art ◽  
Point Of View ◽  
Historical Documents ◽  
Learning Approaches ◽  
Historical Document ◽  
Research Directions ◽  
Research Fields ◽  
Definition Of ◽  
Novel Applications

Nowadays, deep learning methods are employed in a broad range of research fields. The analysis and recognition of historical documents, as we survey in this work, is not an exception. Our study analyzes the papers published in the last few years on this topic from different perspectives: we first provide a pragmatic definition of historical documents from the point of view of the research in the area, then we look at the various sub-tasks addressed in this research. Guided by these tasks, we go through the different input-output relations that are expected from the used deep learning approaches and therefore we accordingly describe the most used models. We also discuss research datasets published in the field and their applications. This analysis shows that the latest research is a leap forward since it is not the simple use of recently proposed algorithms to previous problems, but novel tasks and novel applications of state of the art methods are now considered. Rather than just providing a conclusive picture of the current research in the topic we lastly suggest some potential future trends that can represent a stimulus for innovative research directions.

The Minimum of Sulfur Required for Vulcanization. A Résumé

1932 ◽  
Vol 5 (3) ◽  
pp. 295-295
Author(s):  
G. Bruni
Keyword(s):  
Chemical Reaction ◽  
Point Of View ◽  
The Other ◽  
Chemical Research ◽  
Satisfactory Explanation ◽  
Technical Point ◽  
Physical Chemical ◽  
Fundamental Difficulty ◽  
Definition Of ◽  
Exact Definition

Abstract The problem of the minimum proportion of sulfur necessary to effect vulcanization is fundamental to an interpretation of the very nature of vulcanization itself. Since the introduction of ultra-accelerators, it has been recognized that very small quantities of sulfur are sufficient to bring about vulcanization. In experiments carried out in 1918 in collaboration with G. Menghi in the Laboratory of Chemical and Physical-Chemical Research of the Pirelli Company of Milan, the author found that by the aid of zinc dimethyldithiocarbamate or of similar substances there is an appreciable vulcanization with 0.2 per cent of sulfur. This fact was made public in patents applied for by the author the next year. On the other hand, it is generally recognized today that all vulcanization originates in a chemical reaction, though a fundamental difficulty lies in the fact that it has never been possible to give an exact definition of what is meant by vulcanization. When is a rubber considered vulcanized? From a technical point of view this question may be answered, but there has not been a satisfactory explanation up to this time.

Mechanical analysis of coated materials undergoing fretting fatigue in a cryogenic environment

2002 ◽  
Vol 37 (6) ◽  
pp. 585-589 ◽  
Author(s):  
I Caron ◽  
G Inglebert ◽  
R Gras ◽  
J. M De Monicault
Keyword(s):  
Fretting Fatigue ◽  
Mechanical Analysis ◽  
Industrial Applications ◽  
Point Of View ◽  
Theoretical Point ◽  
Hardening Law ◽  
Coated Materials ◽  
Definition Of ◽  
Fretting Damage ◽  
Contact Parameters

Fretting damage, also known as small-amplitude oscillatory sliding motion, can lead to catastrophic failure in many industrial applications. An understanding of fretting fatigue and its reproduction in laboratory tests have enabled an evaluation to be made of the fretting resistance of homogeneous substrate. To reduce the damage caused by fretting fatigue, increasing use has been made of coatings or treatments that result in inhomogeneous solids. From a theoretical point of view, ascertaining the mechanical behaviour of materials so modified is quite complex due to insufficient definition of the contact parameters. This present study seeks to analyse a layered medium undergoing fretting fatigue in a cryotechnical environment and the improvement in its fretting fatigue resistance. The first step of the analysis of a layered alloy is the determination of the new contact parameters in elasticity, and the second is the characterization of the elastic-plastic coefficients of the strain-hardening law. An evaluation of the lifetime before crack initiation will close the analysis.

scholarly journals URBAN DEVELOPMENT OF HISTORICAL AREAS IN TYUMEN LATE IN THE 19th AND EARLY 20th CENTURIES

2019 ◽  
pp. 24-36
Author(s):  
E. I. Volynets ◽  
I. V. Kulikova
Keyword(s):  
Urban Development ◽  
Point Of View ◽  
Town Planning ◽  
Scientific Publications ◽  
The Road ◽  
Historical Factors ◽  
Research Findings ◽  
Definition Of ◽  
Architecture Development ◽  
The City

Design/methodology/approach: The historical and urban development of Tyumen is analyzed for the period of the 19th and early 20th centuries. The city division into historical areas and administrative districts and the current state of historical areas are considered. The territories of districts and characteristic architectural features are revealed. Purpose: The purpose of this work is to show the development of architecture of the city late in the 19th and early 20th centuries with regard to economic, political and historical factors. Research findings: The analysis of historical areas of Tyumen is given from the point of view of its urban development and architecture. The research utilizes modern and historical maps of the city of Tyumen and scientific publications. The research method consists of the analysis of information about the urban development using the literature and the correlation of this information with historical materials. The analysis is given to architectural dominants and their impact on the architectural and planning of historical areas. Research findings: The definition of historical areas locations and the analysis of the architecture development in Tyumen of the late 19th and early 20th centuries. The diagrams are suggested for the location of architectural areas (churches, factories) and important town-planning elements (squares, squares, cemeteries, etc.) in the city infrastructure. Originality/value: The analysis is given to the intensive population growth in Tyumen, which affects the road system. For the last decade, a new system of streets has been developed both inside and outside the city. This fact affects both the urban planning and the architectural appearance of the city because some of architectural areas have been lost.

Forensic Tactics by Tadeusz Hanausek as a Method for Detecting Perpetrators of Crime

2019 ◽  
Vol 11 (1) ◽  
pp. 85-94
Author(s):  
Karol Juszka ◽  
Kazimiera Juszka
Keyword(s):  
Forensic Science ◽  
Justice System ◽  
Point Of View ◽  
Law Enforcement Agencies ◽  
Research Issues ◽  
Research Activities ◽  
Research Findings ◽  
The Subject ◽  
Definition Of

The aim of the article is to present the views of a classic forensic scientist prof. zw. dr hab. Tadeusz Hanausek, the founder of Cracow school of forensic science, who has shaped the Polish foundations of forensic tactics, which is currently one of the disciplines of forensic science. The presentation of professor Hanausek has been reflected in the implementation of his dogmatic point of view in the practice of law enforcement agencies and the justice system both during his life and after his death. Professor Tadeusz Hanausek determined the reasons for the initial underestimation of the role of forensic tactics despite the acceptance of this term, built a definition of forensic tactics and developed scientific research that allowed him to indicate a growing role of forensic tactics in the implementation of the functions of forensic science and the criminal procedure. The article presents the fundamental issues of Tadeusz Hanausek’s creative scientific interests, which he first defined and then consistently pursued and developed in his scientific and research activities. The pioneering scientific and research issues in question were passed on by professor Tadeusz Hanausek to the representatives of his Cracow school of forensic tactics and then developed, presented and widely discussed on the national, European and international forum. The subject matter of the article is also focused on the examples of practical application of the professor’s ideas in an effective detection of perpetrators of crime. In addition, the publication is based on the research findings of the judicial and prosecutorial records of one of the authors of this article, who is an active representative, popularizer and, above all, a continuator of professor Hanausek’s Cracow school of forensic tactics.

Teaching for Transfer from the Learner’s Point of View

2001 ◽  
Vol 1 (3) ◽  
pp. 266-293
Author(s):  
Shlomo Kaniel
Keyword(s):  
Learning Communities ◽  
Great Difficulty ◽  
Point Of View ◽  
Memory Storage ◽  
Advanced Technology ◽  
Different Types ◽  
Research Findings ◽  
Main Components ◽  
Definition Of ◽  
Transfer Potential

The definition of “transfer” of learning is so broad that it encompasses most realms of psychology, making it difficult to arrive at agreed-upon criteria for classifying different types of transfer. Research findings indicate great difficulty in achieving distal transfer, even when effective didactic principles, such as metacognition, are used. In studies where transfer was achieved, it was limited, relative to levels of investment and expectation. It has appeared mostly in laboratories, with little evidence of maintenance over time.The author proposes that we should examine the products and processes of transfer from the learner’s point of view. This perspective rests on a distinction between transfer potential, which relies on a network of schemas in memory storage, and the transfer process itself, which occurs in working memory. This analysis reduces the number of transfer characteristics and suggests description of transfer as effective and justified use of principles, relationships and strategies, in tasks that are distal from the learner’s point of view. The article leads to the conclusion that to be achieved, transfer must become a curriculum’s central goal (what to teach). The principles and methods of reaching this goal (how to teach) rest on four main components: (a) well planned curricula, (b) training teachers for transfer expertise, (c) “learning communities” and challenging environments, and (d) use of advanced technology.

Understanding functional illiteracy from a policy, adult education, and cognition point of view: Towards a joint referent framework

2019 ◽  
Vol 30 (2) ◽  
pp. 109-122
Author(s):  
Aleksandar Bulajić ◽  
Miomir Despotović ◽  
Thomas Lachmann
Keyword(s):  
Adult Education ◽  
Operational Definition ◽  
Literacy Skills ◽  
Point Of View ◽  
Industrialized Countries ◽  
Functional Illiteracy ◽  
Scale Levels ◽  
Components Of Reading ◽  
The One ◽  
Definition Of

Abstract. The article discusses the emergence of a functional literacy construct and the rediscovery of illiteracy in industrialized countries during the second half of the 20th century. It offers a short explanation of how the construct evolved over time. In addition, it explores how functional (il)literacy is conceived differently by research discourses of cognitive and neural studies, on the one hand, and by prescriptive and normative international policy documents and adult education, on the other hand. Furthermore, it analyses how literacy skills surveys such as the Level One Study (leo.) or the PIAAC may help to bridge the gap between cognitive and more practical and educational approaches to literacy, the goal being to place the functional illiteracy (FI) construct within its existing scale levels. It also sheds more light on the way in which FI can be perceived in terms of different cognitive processes and underlying components of reading. By building on the previous work of other authors and previous definitions, the article brings together different views of FI and offers a perspective for a needed operational definition of the concept, which would be an appropriate reference point for future educational, political, and scientific utilization.

Dosimetry and optimization in digital radiography based on the contrast-detail resolution

2018 ◽  
Vol 6 (3) ◽  
Author(s):  
Wilson Otto Gomes Batista ◽  
Alexandre Gomes De Carvalho
Keyword(s):  
Image Quality ◽  
Inverse Image ◽  
Point Of View ◽  
Complete Analysis ◽  
Portable Devices ◽  
Evaluation Tool ◽  
Air Kerma ◽  
Direct Radiography ◽  
Definition Of ◽  
Entrance Surface Air Kerma

Contrast-detail (C-D) curves are useful in evaluating the radiographic image quality in a global way. The objective of the present study was to obtain the C-D curves and the inverse image quality figure. Both of these parameters were used as an evaluation tool for abdominal and chest imaging protocols. The C-D curves were obtained with the phantom CDRAD 2.0 in computerized radiography and the direct radiography systems (including portable devices). The protocols were 90 and 102 kV in the range of 2 to 20 mAs for the chest and 80 kV in the range of 10 to 80 mAs for the abdomen. The incident air kerma values were evaluated with a solid state sensor. The analysis of these C-D curves help to identify which technique would allow a lower value of the entrance surface air kerma, Ke, while maintaining the image quality from the point of view of C-D detectability. The results showed that the inverse image quality figure, IQFinv, varied little throughout the range of mAs, while the value of Ke varied linearly directly with the mAs values. Also, the complete analysis of the curves indicated that there was an increase in the definition of the details with increasing mAs. It can be concluded that, in the transition phase for the use of the new receptors, it is necessary to evaluate and adjust the practised protocols to ensure, at a minimum, the same levels of the image quality, taking into account the aspects of the radiation protection of the patient.

DIRECTIONS OF ASSOCIATIVE IDENTIFICATION OF PERSONAL NAMES

2019 ◽  
Vol 18 (28) ◽  
pp. 118-128
Author(s):  
Olena Karpenko ◽  
Tetiana Stoianova
Keyword(s):  
Proper Names ◽  
Mental Lexicon ◽  
Point Of View ◽  
Sound Symbolism ◽  
Personal Names ◽  
Communicative Process ◽  
Proper Name ◽  
Definition Of ◽  
Scientific Value ◽  
The Brain

The article is devoted to the study of personal names from a cognitive point of view. The study is based on the cognitive concept that speech actually exists not in the speech, not in linguistic writings and dictionaries, but in consciousness, in the mental lexicon, in the language of the brain. The conditions for identifying personal names can encompass not only the context, encyclopedias, and reference books, but also the sound form of the word. In the communicative process, during a free associative experiment, which included a name and a recipient’s mental lexicon. The recipient was assigned a task to quickly give some association to the name. The aggregate of a certain number of reactions of different recipients forms the associative field of a proper name. The associative experiment creates the best conditions for identifying the lexeme. The definition of a monosemantic personal name primarily includes the search of what it denotes, while during the process of identifying a polysemantic personal name recipients tend have different reactions. Scientific value is posed by the effect of the choice of letters for the name, sound symbolism, etc. The following belong to the generalized forms of identification: usage of a hyperonym; synonyms and periphrases or simple descriptions; associations denoting the whole (name stimulus) by reference to its part (associatives); cognitive structures such as “stimulus — association” and “whole (stimulus) — part (associative)”; lack of adjacency; mysterious associations. The topicality of the study is determined by its perspective to identify the directions of associative identification of proper names, which is one of the branches of cognitive onomastics. The purpose of the study is to identify, review, and highlight the directions of associative identification of proper names; the object of the research is the names in their entirety and variety; its subject is the existence of names in the mental lexicon, which determines the need for singling out the directions for the associative identification of the personal names.

DEFINITION OF THE PUBLIC SECURITY AND ORDERLINESS ENSURING MECHANISM IN UKRAINE

2018 ◽  
Vol 1 (11) ◽  
pp. 155-163
Author(s):  
Marina Aleksandrovna Kalievskaya
Keyword(s):  
Human Rights ◽  
Development Strategy ◽  
State Policy ◽  
The State ◽  
Point Of View ◽  
Public Security ◽  
National Priority ◽  
Institu Tions ◽  
Protection Of Human Rights ◽  
Definition Of

In this article, a model of the mechanism of ensuring public security and orderliness in accordance with the principles and tasks of the relevant institu- tions in public administration, taking into account resources, technologies, mea- sures for the state policy implementation in the spheres of ensuring the protection of human rights and freedoms, the interests of society and the state, combating crime, maintaining public security and order. It was found that ensuring public security and order in Ukraine is a mechanism for the implementation of national goals of state policy in the areas of ensuring the protection of human rights and freedoms, the interests of society and the state, combating crime, maintaining public security and order, by defining tasks according to certain principles. The idea is that if one considers the state policy in the spheres of ensuring the protec- tion of human rights and freedoms, the interests of society and the state, combat- ing crime, maintaining public security and order as a national priority (purpose, task), then the mechanism of ensuring public security and order in Ukraine needs coordination with the state development strategy. From the point of view of the implementation of the state policy in the areas of ensuring the protection of hu- man rights and freedoms, the interests of society and the state, combating crime, maintaining public security and order, the mechanism of ensuring public security and order in Ukraine can be considered as the main system providing intercon- nection such elements as institutions (implementing the specified state policy), resources (human resources, logistical, natural and so on, with the help of which it is possible to implement state policy), technologies (skills, knowledge, means and so on the implementation of state policy), measures (action plans), as well as external (internal) threats.

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