Work Piece Research Articles

Cutting performance and antifriction mechanism of Al2O3/TiC/TiB2/h-BN@Al2O3 self-lubricating ceramic tool

The machinability and wear reduction mechanism of self-repairing and self-lubricating ceramic tools sintered by vacuum hot-pressing method in the dry turning of 40Cr hardened steel was studied. By comparing the cutting performance and wear morphology of AT (Al2O3/TiC) ceramic tools under different cutting parameters, it was found that AT10B@5 (Al2O3/TiC/10 vol% TiB2/5 vol% h-BN@Al2O3) tool has a longer service life and better machining quality. Owing to the precipitation of solid lubricant during the cutting of AT10B@5 ceramic tool, the friction force during the cutting is reduced, thus decreasing the cutting force and cutting temperature of AT10B@5 ceramic tool during the cutting. The main cutting force decreased by 20.8%; the cutting temperature decreased by 22.2%; and the friction coefficient of front tool face decreased by 11.6% compared with AT tool. This effectively improved the surface quality of working parts, reduced the tool wear, increased the processing quality of work piece, and prolonged the tool life.

Erratum to: Enhancing Asphalt Mixture Performance with Crumb Rubber: A Sustainable Solution for Improved Durability and Mechanical Properties

The proceedings editor has inappropriately added two references to his own works without consulting the original authors. The journal follows the principles set forth by the Committee on Publication Ethics (COPE), including the principle that editors should not publish changes to an author's piece of work without those changes having been agreed with and approved by the author(s). A reversion of the article without the two references has been published.

SYSTEMATIC REVIEW OF ADVERTISING ARTICLES IN THE NIGERIA CONTEXT: THEMES, THEORIES, AND METHODS

This bibliography covers scholarly journal articles, books, projects, and reports on Nigerian Advertising. Each piece of work has an annotation that highlights its conclusions, methodologies, research topics, and suggestions. The 70 materials are used for this finding. A systematic analysis was used in collecting the data. Findings revealed that researchers over the years have focused mainly on topics relating to Advertising and marketing, problems and challenges etc, and neglected areas like Advertising and Religion, outdoor advertising, etc. It is therefore recommended that researchers should diversify and research on Advertising and other areas like language and television, newspaper and politics, etc is finished

Ignacio Prat y la transducción dantesca

In Spain during the second half of the twentieth century a certain type of poetry was born that did not find the place and the space for the debate that it undoubtedly deserved given its high linguistic and literary value. In this sense, the poetry of the Spanish poet Ignacio Prat deals with those types of writings that flank with experimentalism and with the true avant-garde itself. In this piece of work and through the study of a text entitled “Lineamenta” we will endeavor to show how the presence of a universal poet such as Dante can be perceived in the making and editing of the very text of such a poet. The proximity between literary creation and translation is proven here with the analysis of the poem, which, as we shall see, is influenced by the presence of Dante by a game of intertextual cross-references that achieve to offer us a poem of high communicative content adorned with diachronic literary materials that the Spanish poet can reuse for a text of contemporary poetry.

Old Photos Restoration by Using VAE

VAE is a generative model that “provides a probabilistic description of observations in potential Spaces”. Put simply, this means that VAE stores potential attributes as probability distributions. The idea of variational auto-encoders or VAE is deeply rooted in the methods of variational DB Bayesian and graphical models. This piece of work will discuss VAE Structure, VAE Loss Function, VAE Translation, and our final effects.

Current Research Trends in Electrical Discharge Machining : A Review

One of the most widely utilised non-conventional exact material removal procedures is electrical discharge machining (EDM). Hard metals can be moulded using the electrical discharge machining (EDM) method, which uses arc erosion to create deep, intricately formed holes in all types of electroconductive materials. Between the work piece and the electrode, there is a tiny space where erosion pulse discharge takes place. By melting and vaporising the undesired material, this separates the parent metal from the unwanted stuff. The objectives of this new study are the same: to reduce tool wear and achieve enhanced surface quality while reducing metal removal rate. This study discusses the scientific work done from the beginning to the invention of die-sinking EDM, Water in EDM, and dry Electric discharge machining and powder-mixed EDM are also used. in the last ten years. Additionally, a brief description of the EDM research plan going forward is included.

Optimisation of cold extrusion process parameters on AA 2024 alloy using grey relational analysis

The present work investigates the influence of process parameters on cold extrusion process. Die angle (DA), ram speed (RS) and coefficient of friction (CoF) are chosen as input parameters. The output responses are extrusion force, damage factor, work piece displacement and extrusion time. AA 2024 material is considered as work piece material. The input process parameters are subjected to three levels of variation. Numerical simulations are performed by using DEFORMTM-3D. The simulations are conducted as per L27 orthogonal array. The percentage of contribution of DA, RS and CoF on extrusion force, damage factor, work piece displacement and extrusion time are analysed by using analysis of variance (ANOVA). Multi variable optimisation also done by using grey relational analysis (GRA). From the individual analysis, it is noticed that DA and RS have significant influence on extrusion force and work piece displacement whereas CoF is insignificant. However, the CoF shows significant impact on damage factor and extrusion time. The highest grey relation grade is obtained for experiment conducted at the 27th. The optimum combination of process parameter for extrusion force, damage factor, work piece displacement and extrusion time are 30ºDA, 4.8 mm/min RS and 0.1 CoF.

Аналіз науково-технічних інновацій в галузі машинобудування з виявленням закономірності впливу технологічних параметрів

Based on the analysis of scientific and technical information, it established that today layered metals are one of the most modern and promising materials used in all branches of mechanical engineering and national economy. The use of bimetals allows you to achieve significant cost savings, obtain materials with unique properties, increase production efficiency and competitiveness of a wide class of parts and equipment. The purpose of the article is to analyze the methods of determining the stress state of a workpiece with heterogeneous mechanical characteristics in the process of plastic deformation and to determine the stress-strain state when drawing rectangular parts from bimetals. As a result, of unequal deformation conditions in different parts of the contour, as well as anisotropy of the mechanical properties of the workpiece material, the height of box-shaped parts is even more uneven than the height of axisymmetric parts obtained by drawing. Therefore, in the manufacturing process of such parts, cutting of the uneven edge provided. The trimming allowance depends on the relative height of the part. The bigger it is, the bigger the allowance. Since the flange naturally thickens during drawing in the corner sections of the part contour, this phenomenon taken into account when determining the gap between the punch and the die of the drawing die: in the corner sections, the gap should be greater than in the straight sections of the die contour. Extrusion of box-shaped parts from bimetals causes even greater unevenness of deformations. A different amount of deformation of the layers of the bimetallic work piece imposed on the general sign change of the voltages, which causes bending and warping of the rectilinear parts of the semi-finished product, and therefore, the impossibility of obtaining a high-quality product. Based on the analysis of the stress-strain state of the workpiece in the process of drawing bimetal. The following provisions are proposed: if the mechanical properties of the metal layers do not differ - the two-layer metal behaves like a single-layer, then the ratio of the thicknesses of the two-layer metal does not change after drawing; if the mechanical properties of the layers differ, then the ratio of the thicknesses of the two-layer metal changes after drawing. Thus, when the ratio σs1/σs2 decreases, the thickness of the first layer, which has lower mechanical properties, decreases at the output; the thickness ratio after drawing also depends on the initial ratio of metal thicknesses. Based on the analysis of the stress-strain state of the work piece during the extraction of box parts, the following methods and techniques have been determined for obtaining high-quality parts by extraction and saving material: use metals with similar mechanical properties; the desire to increase the curvature of the corner zones of the work piece; to calculate the dimensions of the work piece for the hood with the involvement of modern mathematical apparatus (potential method); use brake media instead of brake ribs; affect the center of deformation, increasing the effect of unloading tangential stresses.

Investigation of WEDM parameters on Material Removal Rate and Plane Roughness of AISI4130 steel

Wire electrical discharge machine is a unconventional machining process. In WEDM Process more or less conductive materials only able to machined it. In WEDM material is removal from the work piece by continuous release of spark linking the work piece and the wire electrode. AISI 4130 low alloy steel is in recent times developed advanced materials having excellent material properties which will be used for aerospace and oil gas industry applications. In this paper the Experiments are conducted by using Tanguchi’s L18 orthogonal array and five input parameter voltage, current, pulse off time, pulse on time, wire type. Appling the ANOVA to conclude most significant machining parameter is voltage for the material removal rate and Plane Roughness

Process parameter of EDM to optimize material Removal Rate using Box Behnken’s design

In high-precision machining, Electrical Discharge Machining (EDM), product is formed with more hardness materials where the thermoelectric energy sandwiched between the electrode and the work piece serves as a basis for the EDM mechanism. Peak current, pulse on time, dielectric pressure, electrode polarity, work piece material, electrode material, flushing pressure, flushing direction, and flushing method are just a few of the many parameters that can be changed during the process. The focus of this research is to identify the EDM process's parameters in order to enhance productivity as measured by EN-31 tool wear rate and material removal rate (MRR). Peak current, pulse on time, dielectric pressure, and tool size were the variable parameters, each with three levels. Three 3-level variables were applied using RSM orthogonal arrays L29. As per the equation developed, the peak current inputs have a significant influence in determining the MRR for the range of experimental values under consideration, but for the TWR, the greatest impact is produced by the pulse on time, followed by the size of the tool. According to the optimization results, the discharge current of 34A, the pulse on time of 1000 μs, the dielectric compression of 1.2 kg/sq.cm, and the tool size of 16 mm are optimum for MRR.

AUTOMATIC TOOL PATH GENERATION IN CONTOUR MILLING USING GENETIC ALGORITHM

The purpose of this paper is to present new approach in automatic tool path generation in contour milling based on genetic algorithm and bitmap representation of work piece and additional resources. It deals with the problem of tool path generation and optimization in contour milling which is the most common case in metalworking industry. The starting point is assumption that the geometry of initial working piece, machined part and clamping fixtures is represented as bitmaps, then the mathematical model is presented and genetic algorithm is used to generate and optimize tool path. Proposed approach greatly reduced the costs of part production through improved machining efficiency, realized through independent software solution implemented in object-oriented language Delphi and can be used as starting point for fully autonomous NC code generation.

Unnatural helical peptidic foldamers as protein segment mimics.

Unnatural helical peptidic foldamers have attracted considerable attention owing to their unique folding behaviours, diverse artificial protein binding mechanisms, and promising applications in chemical, biological, medical, and material fields. Unlike the conventional α-helix consisting of molecular entities of native α-amino acids, unnatural helical peptidic foldamers are generally comprised of well-defined backbone conformers with unique and unnatural structural parameters. Their folded structures usually arise from unnatural amino acids such as N-substituted glycine, N-substituted-β-alanine, β-amino acid, urea, thiourea, α-aminoxy acid, α-aminoisobutyric acid, aza-amino acid, aromatic amide, γ-amino acid, as well as sulfono-γ-AA amino acid. They can exhibit intriguing and predictable three-dimensional helical structures, generally featuring superior resistance to proteolytic degradation, enhanced bioavailability, and improved chemodiversity, and are promising in mimicking helical segments of various proteins. Although it is impossible to include every piece of research work, we attempt to highlight the research progress in the past 10 years in exploring unnatural peptidic foldamers as protein helical segment mimics, by giving some representative examples and discussing the current challenges and future perspectives. We expect that this review will help elucidate the principles of structural design and applications of existing unnatural helical peptidic foldamers in protein segment mimicry, thereby attracting more researchers to explore and generate novel unnatural peptidic foldamers with unique structural and functional properties, leading to more unprecedented and practical applications.

Nursing students` experience of writing a bachelor thesis – a qualitative study

The bachelor thesis (BT) in nursing education is a significant piece of academic work for students. It serves as an instrument for demonstrating and assessing the knowledge they have gained throughout their education. The BT also introduces the students to the field of research. Students often write it on their own, and it has been characterized as the ultimate self-regulating learning task for undergraduate students. This study aims to explore undergraduate nursing students’ experiences of being in the process of writing their BT. It is valuable to gain information on students’ experiences in the middle of the writing process to improve the pedagogical and practical organization of the BT course in nursing education. Individual interviews were conducted with 14 students who were in the process of writing their BT. Qualitative content analysis was used to analyse the interviews. The theory of self-regulated learning was used to explore and contextualize the findings. The main findings are that the nursing students operated in both an individual and a social context while writing on their BT. Further, the study describes how students utilized and developed previous knowledge and organized the writing process. It also discusses how their personal abilities and motivation affected their learning process. The findings also show that students viewed discussions and feedback on their BT as being positive, and they provide information on how students experienced obstacles and unmet expectations. This study found that the most important self-regulated learning strategies used by the students while writing the BT were help-seeking, goal setting, time planning, and study techniques.

Tasks and feedback: An exploration of students’ opportunity to develop adaptive expertise for analytic text-based writing

In this study, we apply a cognitive theoretical lens to investigate students’ opportunity to develop their analytic text-based writing skills (N = 35 fifth and sixth grade classrooms). Specifically, we examine the thinking demands of classroom text-based writing tasks and teachers’ written feedback on associated student work. Four text-based writing tasks with drafts of associated student work were collected from teachers across a school year. Results of qualitative analyses showed that about half of the classroom text-based writing tasks considered by teachers to be challenging guided students to express analytic thinking about what they read (n = 73). A minority of student work received written feedback focused on students’ use of evidence, expression of thinking, and text comprehension; or received feedback that provided guidance for strategies students could take to meet genre goals. Most teachers provided content-related, instructive, and/or localized feedback on at least one piece of student work. Only a small number of teachers, however, consistently provided content-related, instructive or localized feedback on their students’ essays. Overall, results suggest that students have few opportunities to practice analytic text-based writing and receive feedback that would be expected to advance their conceptual understanding and adaptive expertise for writing in this genre.

The Impact of Agile Methods on the Software Projects Implementation and Management

There are emerging patterns of failure and success as more software projects adopt Agile methods. Project managers now need to understand the factors that influence project performance, as well as the applicable practices to their projects. Although some companies claim that Agile methods can solve all their issues, few have consistently shown success over other types of software projects. Although Agile methods can accommodate change due to the volatile requirements, they can also expose project managers to risks when it comes to managing the multitude of pieces of work involved in a project. This paper aims to provide a comprehensive analysis of the various trade-offs that are involved in adopting the method.

Why Robert Scholes's Utopian Vision Did Not Become Reality, and How to Make It Happen

Why Robert Scholes's Utopian Vision Did Not Become Reality, and How to Make It Happen

A Novel Approach Toward Q-Rung Orthopair Fuzzy Rough Dombi Aggregation Operators and Their Application to Decision-Making Problems

It is the purpose of this paper to present and explain the fuzzy set of concepts Zadeh that are discussed in membership grade. We also demonstrate that three-way analysis is crucial in decision-making systems. In order to implement a three-way decision, various elements are required, such as conditional probability, estimated loss, and decision rules. The objective is to describe first the Q-ROFRS (Q-Rung Orthopair Fuzzy Rough Set) to define some fundamental operational rules under the dombi norms. The use of these operation laws can allow us to define some aggregation operators, which include Q-ROFWA (Q-Rung Orthopair Fuzzy Rough Weighted Average), Q-ROFROWA (Q-Rung Orthopair Fuzzy Rough Order Weighted Average), and Q-ROFHWA, which are all based on Q-Rung Orthopair Fuzzy Rough Hybrid Weighted Averages. By applying these operation laws, we can use these operator laws to calculate expert information that can be utilized in the calculation process. Ultimately, we have applied all three-way process rules to rank and find the best results possible. To determine the accuracy and relevance of each piece of work, we conducted a comparative analysis with other recent works that have been published.

Assyrian history of Herodotus : the missing and the extant logos

Herodotus wrote down a very brief account of the history of Assyria in his Histories, but he promised to deliver a complete logos as well. We can find two remarks on this future project that (possibly) never materialized in the end. In the preserved text, there are only several mentions of Assyrian kings, history, and customs, but it seems he planned to expand the narrative further, potentially in a separate piece of work. The result was a mysterious Assyrian logos. In this article, I will explore the possible influence of Herodotus' account on the Greek tradition about this eastern land through either one of these logoi, if, in fact, he had any at all. In the first part, I will examine the sources, whether they refer to his more detailed treatise on Assyria, and what can be said about this work in general. In the second part, I will focus on his extant Assyrian logos, whether any later author (most notably Ctesias and Berossus) could have used his work as a source, and who became the authorities on the history of Assyria, considering the changes in the narratives.

Carnivalesque Reading of Halide Edib Adivar’s The Clown and His Daughter

Halide Edib Adıvar (1884-1964), prominent and revolutionary Turkish writer, wrote her novel The Clown and His Daughter in 1935 in English. With a colourful story of Rabia’s psychological, social, and physical development, Adıvar undertakes a meticulous re-examination of the social categories of her native land during an empire’s rapid moving into a state of a republic. This study will claim that Adıvar’s novel The Clown and His Daughter is a purely carnivalesque piece of work if analysed in terms of Bakhtin’s concept of the carnival. Mikhail Bakhtin rests the importance of the carnival sense of the world upon the transcending of every possible barrier between all living creatures in the universe. The theory of the carnival is infused with the atmosphere of freedom, excessiveness, challenge, rebirth, and bodily priorities. In a carnivalistic world, where a king can become a slave, an old woman can die while giving birth to a baby, or a man can unite with the whole world while consuming food. Bakhtin discusses such images under the term of the grotesque – an image of the bodies that constantly change from one form into another. Adıvar’s novel, in the same vein, focuses on the underlying unity between genders, communities, religions, races and human beings and animals. The setting and the characters in Adıvar’s novel can be recognised as carnivalistic because of their eccentricity, tendency to subvert social norms, and the urge to be able to feel the unity with the whole world. This study will conclude that Adıvar’s aim in writing this novel was to reveal the fundamental principle of a Turkish society – its social wealth that is indelibly marked by its endless varieties, differences, and fluctuating reality.

The C-terminal pentapeptide acein analogue (JMV3315) stimulates dopamine release in the brain

We have previously reported the synthesis and biological activity of a newly identified peptide of sequence H–Pro–Pro–Thr–Thr–Thr–Lys–Phe–Ala–Ala–OH called acein that is able to stimulate dopamine release in the brain of rodents in vivo and ex vivo by interacting with angiotensin converting enzyme (ACE). In the present piece of work, we studied the structure–activity relationships of acein using displacement experiments of the labelled ligand [125I]Tyr–Pro–Pro–Thr–Thr–Thr–Lys–Phe–Ala–Ala–OH on guinea pig brain membranes, known to have high-affinity acein binding sites. We determined that the C-terminal pentapeptide H–Thr–Lys–Phe–Ala–Ala–OH is the minimal structure able to interact with high affinity (Ki (inhibitory constant) 13 ± 2 nM) with acein binding sites. Among the analogues of the pentapeptide that were synthesized, the pentapeptide H–Thr–Lys–Tyr–Ala–Ala–OH showed the highest affinity (Ki 3.7 ± 1.0 nM). Accordingly, this pentapeptide was able to stimulate dopamine release from striatal slices taken from the sensorimotor territory of rats.