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![Curve TTT of Steel Alloy SAE 4140. Source: [8]](profile/Ramon-Santos-6/publication/342675473/figure/fig1/AS:909551025004546@1593865271568/Curve-TTT-of-Steel-Alloy-SAE-4140-Source-8.jpg)
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![Fig. 5: Curve TTT of Steel Alloy SAE 4140. Source: [8]](profile/Ramon-Santos-6/publication/342675473/figure/fig1/AS:909551025004546@1593865271568/Curve-TTT-of-Steel-Alloy-SAE-4140-Source-8_Q320.jpg)
The proposal of the Jominy test is to analyze the hardness of certain specimens, leading to a better understanding of the heat treatments, more precisely, in the severity of the hardening heat treatment, thus contributing to the economy of finite material resources. The project is aligned with the objectives of performing this quantitative and qual...
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Citations
... According to [8] Continuing, for a better visualization was determined a necessary development of the design using the Auto CAD software, being illustrated in Figure 6. ...
This work contributed to a detailed study on a better understanding of the Jominy test, adopted a proportion of study to create the Jominy test device, exhibited favorable conceptions for the development of a prototype of the device, covering the four aspects of the project, being they: test device, test body heating system, test automation and instrumentation using embedded electronics and financial analysis for the elaboration of this project in Brazil. It was possible to observe in the results that the system is efficient, simple and functional, it was possible to obtain the first test carried out in the controlled environment the temperature data in degrees centigrade, the recorded data were automatically launched in Microsoft Excel by the PLX DAQ software, making the acquisition of the data. In the matter of preparing the test device, the drawings are presented in the 3D modeling software, cost tables of the materials used for assembly in Brazil. In terms of the heating system, a heating system was adopted that uses electromagnetic induction, the cost of materials related to the heating system design was also presented. Another relevant factor that contributes to the research and improvement of the prototype is the municipality, located in the Paraiba Valley region, located in the state of São Paulo, consisting of a fertile and relevant scenario of regional, national, international and multinational statistics, thus concluding the effectiveness for the mainly metallurgical industries. The results obtained were satisfactory and consistent, when they were created for the Jominy test device with the ability to submit small pieces for testing and mainly essential in the didactic point of view for a higher education institution of engineering and technology.
This work analyzes replacing an insert made of ceramic with an insert made of CBN (Cubic Boron Nitride). The inserts are cutting tools used in machining. We will start by presenting a brief account of what machining is, what is applicable in this research and the properties of the two cutting tools. We will also include our objective and justification for carrying out the project. Next, we will describe all of the equipment and tools used in the process to verify results, detailing the function of each one. We will explain our method step by step and show the properties of each insert and their use. We will compare the inserts during operations, and some results will be analyzed graphically in order to obtain a better picture of the behavior of the inserts. We will finish the paper by summarizing and calculating the results, on a cost-benefit ratio, thereby allowing us to determine the most viable replacement insert for use in industry.
Chronic kidney disease is the most common type of organ failure worldwide, with a prevalence of 13.4% for all stages. Organ transplant is the only curative option for end-stage kidney failure. However, the shortage of organ donors remains a major obstacle in organ transplant, with donation after circulatory death being the most viable path to increasing the donor pool. The circumstances that surround this type of donation are different from donation after brain death, namely concerning warm ischemia times, which are longer and may preclude a successful transplant. This article describes the pathophysiology of warm ischemia and summarizes recent developments in technological and methodological practices that mitigate the mechanisms of warm ischemia. Anoxia, mitochondrial dysfunction, calcium overload, oxidative and nitrosative stress, immune response, and no reflow are the main mechanisms by which ischemia leads to cell death and organ dysfunction. In situ oxygenated recirculation, abdominal normothermic organ recirculation, abdominal hypothermic organ recirculation, and ex vivo machine perfusion ensure continued organ perfusion and prevent prolonged warm ischemia in organ donation. These practices, coupled with optimizations in the identification and assessment of potential donors after circulatory death, may lead to a significant increase in the number and success rates of organ transplant worldwide.
