scholarly journals A Concise Study on Shearing Operation in Metal Forming

2021 ◽  
Vol 309 ◽  
pp. 01004
Author(s):  
M. Ikumapayi Omolayo ◽  
A. Afolalu Sunday ◽  
S. Fatoba Olawale ◽  
A. Kazeem Rasaq ◽  
A. Adetunla Adedotun ◽  
...  

This study outlines the recent developments in metal forming processes, focusing mainly on the shearing process. A summary of the background of the shearing process is given to give perspective on how such a process has changed over time. It explains what shearing operations are and how the shearing process is operated in metal forming. While also outlining the difference between shearing, slitting, punching, notching, and blanking processes, and the advantages and disadvantages of the shearing process are detailed. Different types of modern shearing machines are documented. The ways of ensuring the optimal functionality of the shearing machine and how the shearing operation has improved the manufacturing products were scripted. Three cases were given on the recent advancement in the use of shearing operation. Recommendations on how to improve efficiency in shearing metal forming are specified with relevance to the theory and a conclusion is drawn.

1935 ◽  
Vol 130 (1) ◽  
pp. 75-190 ◽  
Author(s):  
Harold Sinclair

The use of hydraulic couplings in practically all fields of engineering has increased rapidly during the last few years. The paper traces the history of the Vulcan-Sinclair hydraulic coupling, which is of the turbo or hydro-kinetic type, from the days of its inception up to the present time, and gives details of other designs of the displacement or hydro-static type that have been developed, and the principles upon which they operate. The main advantages of the turbo design are enumerated and considerable test data are given, with particular reference to the Vulcan coupling, which, in theory, is the forerunner of the Vulcan-Sinclair designs. Advantage is taken to explain the difference between fluid couplings and torque converters, concerning which a good deal of confusion exists. The differences between the various types of Vulcan-Sinclair hydraulic couplings and the improvements that have been effected in design during recent years are described in detail. The paper deals comprehensively with numerous applications of the different types of couplings covering both the industrial and automotive fields. The difficulties, and their cures, which have arisen in connexion with a number of applications are given prominence. A section deals with change-speed gearboxes arranged in conjunction with hydraulic couplings for use in Diesel traction.


2019 ◽  
Vol 70 (1) ◽  
pp. 239-244
Author(s):  
Claudia Florida Costea ◽  
Camelia Margareta Bogdanici ◽  
Alexandru Carauleanu ◽  
Gabriela Dimitriu ◽  
Anca Sava ◽  
...  

Since Ancient Egypt up to present day, there have constantly been attempts at creating a perfect ocular prosthesis, which would complement the outstanding deficit in the orbit as a result of enucleation, evisceration and which should be biocompatible with the orbital tissue. Over time, there have been used numerous clinical materials, which were the basis of these eye prostheses. By revising literature through the search engines PubMed, MEDLINE and other sources, this article aims at emphasizing, in a chronological sequence, the way in which different types of ocular prostheses were created, but also their advantages and disadvantages. The evolution and design of biomaterials improved the eye rehabilitation process and reduced the complications caused by these prostheses in the anophthalmic socket.


1993 ◽  
Vol 33 (1) ◽  
pp. 418
Author(s):  
Craig W. O. Phillips ◽  
Marian F. Gibney

Exploration companies (particularly junior exploration companies) at the time of acquiring acreage under exploration permits, are often required to consider farming out their interests in order to sustain development. In such circumstances, it is usual to retain some form of royalty or carried interest arrangement. However, the form and nature of the interest retained, and the rights and obligations attaching to it are of vital importance in the subsequent development of the acreage. The basic understanding of these arrangements may make the difference between a project being economic or uneconomic. The conference paper proposes to review the different types of royalty or similar interests and their relative advantages and disadvantages. In doing so, it will review some of the more pertinent aspects of Australian and, to some extent, U.S. oil and gas law.


Sensor Review ◽  
2014 ◽  
Vol 34 (1) ◽  
pp. 24-35 ◽  
Author(s):  
Sari Lakkis ◽  
Rafic Younes ◽  
Yasser Alayli ◽  
Mohamad Sawan

Purpose – This paper aims to give an overview about the state of the art and novel technologies used in gas sensing. It also discusses the miniaturization potential of some of these technologies in a comparative way. Design/methodology/approach – In this article, the authors state the most of the methods used in gas sensing discuss their advantages and disadvantages and at last the authors discuss the ability of their miniaturization comparing between them in terms of their sensing parameters like sensitivity, selectivity and cost. Findings – In this article, the authors will try to cover most of the important methods used in gas sensing and their recent developments. The authors will also discuss their miniaturization potential trying to find the best candidate among the different types for the aim of miniaturization. Originality/value – In this article, the authors will review most of the methods used in gas sensing and discuss their miniaturization potential delimiting the research to a certain type of technology or application.


Author(s):  
Shweta Singh ◽  
Amar N. Tiwari ◽  
Sri N. Singh

The Vector control scheme widely used for control purposes of PMSM drives requires rotor position information. Generally, sensors are used for this purpose, which increases the cost, size, and complexity of the system and also reduces the efficiency of drives. Therefore, it has become essential to avoid the use of these sensors and go for sensorless drives. In this paper, different types of speed and position estimation techniques are reviewed for sensorless control with their recent developments and their inherent advantages and disadvantages.


2020 ◽  
Vol 54 (2) ◽  
pp. 281-315
Author(s):  
Karolina Grzech ◽  
Eva Schultze-Berndt ◽  
Henrik Bergqvist

AbstractThis article provides an introduction for the collection of methodologically oriented papers comprising this Special Issue. We define the concept of epistemicity as used in descriptive linguistics and discuss notions related to it – some well-established, some more recent – such as evidentiality, egophoricity, epistemic authority and engagement. We give a preliminary overview of the different types of epistemic marking attested in the languages of the world and discuss the recent developments in the field of epistemic research focussing on methodologies for investigating epistemic marking. In the second part of the paper, we focus on the more practical side of epistemic fieldwork; the types of data that can be used in documenting linguistic expressions of epistemicity and best practices for data collection. We discuss the experimental methods that are used in the description of epistemic systems, both those developed for this particular purpose and those adapted from other types of linguistic research. We provide a critical evaluation of those materials and stimuli and discuss their advantages and disadvantages. Finally, we introduce the contributions to the Special Issue, discussing the languages studied by the authors of the contributions and the fieldwork methods they used in their research.


2021 ◽  
Vol 9 ◽  
Author(s):  
Xiao Li ◽  
Shiqiao Wu ◽  
Guanqing Zhang ◽  
Wanzhu Cai ◽  
Jack Ng ◽  
...  

Recent developments of band topology have revealed a variety of higher-order topological insulators (HOTIs). These HOTIs are characterized by a variety of different topological invariants, making them different at a fundamental level. However, despite such differences, the fact that they all sustain higher-order topological boundary modes poses a challenge to phenomenologically tell them apart. This work presents experimental measurements of the coupling effects of topological corner modes (TCMs) existing in two different types of two-dimensional acoustic HOTIs. Although both HOTIs have a similar four-site square lattice, the difference in magnetic flux per unit cell dictates that they belong to different types of topologically nontrivial phases—one lattice possesses quantized dipole moments, but the other is characterized by quantized quadrupole moment. A link between the topological invariants and the response line shape of the coupled TCMs is theoretically established and experimentally confirmed. Our results offer a pathway to distinguish HOTIs experimentally.


2020 ◽  
pp. 150-166
Author(s):  
Irina O. Tkacheva ◽  

The article considers the problems of the systemic principle implementation in the Dictionary of the 21st-Century Russian Language (compiled under the guidance of Doctor of Philology, Professor Galina N. Sklyarevskaya at the Herzen State Pedagogical University of Russia). According to this principle, words connected by different types of relations in the lexical system must be described in parallel to correlate definitions to each other. Therefore, the dictionary has been compiled not from word to word in alphabetical order, but by combining words in lexical groups and word families, then describing words belonging to one lexical group or word family, and then arranging the finished entries alphabetically. The main difficulties of applying the systemic principle arise because of the necessity to differentiate the meanings of non-absolute synonyms by finding differential semes, while synonymous conjunctions (as well as other functional parts of speech) are usually distinguished only by subtle semantic and pragmatic properties, and this fact complicates the task of their lexicographical interpretation. The analysis of definitions in the Russian explanatory dictionaries shows that there are several ways to define conjunctions with similar, but not equal meanings: 1) by listing several synonyms (each conjunction is defined by two or more synonymic conjunctions without describing the meaning); 2) by giving identical or similar formal definitions, which indicate only a type of a conjunction or a type of a joined clause or construction; 3) by giving equal descriptive definitions; 4) by giving descriptive definitions that are not identical but at the same time indistinguishable; 5) by giving similar, but not identical descriptive definitions indicating the difference between non-equal meanings. In the author’s opinion, the last way of constructing definitions is optimal for describing conjunctions with similar meanings, but it is applied rarely and inconsistently. The compilers of the Dictionary of the 21st-Century Russian Language have a task to compose definitions this way and not to give the same or similar, but indistinguishable interpretations for different words. As a result of extensive work on dictionary entries, it was decided to use typical short commentaries (indicating intensity, softening, redundancy, a certain speaker’s attitude to the situation, etc.) that should be given at the end of the definitions to show the most subtle semantic and pragmatic differences. Thus, the main feature of the Dictionary of the 21st-Century Russian Language, its main difference from most of the other explanatory dictionaries is that it not only describes lexical and semantic innovations, but also changes the general principle of describing the basic lexicon, in which no such changes have occurred over time. The lexicographical methods of constructing definitions the dictionary uses are traditional, but the dictionary compilers try to apply them more consistently and more systematically.


Author(s):  
Galen Strawson

This chapter examines the difference between John Locke's definition of a person [P], considered as a kind of thing, and his definition of a subject of experience of a certain sophisticated sort [S]. It first discusses the equation [P] = [S], where [S] is assumed to be a continuing thing that is able to survive radical change of substantial realization, as well as Locke's position about consciousness in relation to [P]'s identity or existence over time as [S]. It argues that Locke is not guilty of circularity because he is not proposing consciousness as the determinant of [S]'s identity over time, but only of [S]'s moral and legal responsibility over time. Finally, it suggests that the terms “Person” and “Personal identity” pull apart, in Locke's scheme of things, but in a perfectly coherent way.


Author(s):  
V. Suganya ◽  
V. Anuradha

Encapsulation is a process of enclosing the substances within an inert material which protects from environment as well as control drug release. Recently, two type of encapsulation has been performed in several research. Nanoencapsulation is the coating of various substances within another material at sizes on the nano scale. Microencapsulation is similar to nanoencapsulation aside from it involving larger particles and having been done for a greater period of time than nanoencapsulation. Encapsulation is a new technology that has wide applications in pharmaceutical industries, agrochemical, food industries and cosmetics. In this review, the difference between micro and nano encapsulation has been explained. This article gives an overview of different methods and reason for encapsulation. The advantages and disadvantages of micro and nano encapsulation technology were also clearly mentioned in this paper.


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