Tribological Properties of Composite Materials Obtained Using Electrodepositing

The resistance to abrasive wear of composite materials obtained using electrodepositing in nickel and copper matrix was studied. The samples containing composite layers of graphite in copper matrix, titan dioxide and zirconium dioxide in nickel matrix were subjected to the wear process using a pin-disc type testing machine

Hardened Aluminum with Discontinuous Copper Threads

The paper presents the influence of the quantity of discontinuous reinforced threads on the mechanical characteristics of some samples obtained through deformation from composite material with metallic matrix. As a raw material for obtaining the matrix it was used aluminum powder and as a reinforcing phase, short and long copper threads with different volumetric percentages. The products have been plastically deformed at a final diameter of 3 mm. The presence of the copper threads dispersed in the aluminum matrix in quantities of up to 16% copper (volumetric percentages), determines the hardening of the composite material. Above this limit the increase in the quantity of copper is no longer justified as it begins fragilizing the aluminum matrix

On the Constitutive Equation of a Low Carbon Steel

The paper shows the results of the researches concerning the equation of deformation behavior of low carbon steel. The behavior law is established starting from the experimental torsion moment. The composed constitutive law had very good experimental verification

Researches Concerning the Deformation Behaviour of Low Carbon Steel

The paper shows the results of the researches meant to establish the equation of deformation behavior of low carbon steel. The behavior law is established by the experimental way, using the torsion test method. The composed constitutive law had very good experimental verification

Comparative study of Ti and Ti alloy for possible medical application

In the realm of modern medicine, the quest for innovation and improvement is relentless. One significant development that has transformed the landscape of medical devices and implants is the use of titanium and titanium alloys. Just as Titan stands as a resilient moon in the outer reaches of our cosmic neighborhood, titanium and its alloys have emerged as robust and versatile materials for a wide array of medical applications. From orthopedic implants to dental prosthetics, and even in cutting-edge biomedical engineering, titanium's exceptional combination of strength, biocompatibility, and corrosion resistance has made it an indispensable asset in modern medicine. Titanium and its alloys are not just elements on the periodic table; they are key elements in the quest for stronger, longer-lasting, and more effective medical treatments and devices

Structural characteristics of multilayered ni-ti nanocomposite fabricated by high speed high pressure torsion (Hshpt)

47PCCDI/2018 MANUNET 3 PN3-P3-302 grant number 99-2019It is generally accepted that severe plastic deformation (SPD) has the ability to produce ultrafinegrained (UFG) and nanocrystalline materials in bulk. Recent developments in high pressure torsion (HPT) processes have led to the production of bimetallic composites using copper, aluminum or magnesium alloys. This article outlines a new approach to fabricate multilayered Ni-Ti nanocomposites by a patented SPD technique, namely, high speed high pressure torsion (HSHPT). The multilayered composite discs consist of Ni-Ti alloys of different composition: a shape memory alloy (SMA) Ti-rich, whose Mf > RT, and an SMA Ni-rich, whose Af < RT. The composites were designed to have 2 to 32 layers of both alloys. The layers were arranged in different sequences to improve the shape recovery on both heating and cooling of nickel-titanium alloys. The manufacturing process of Ni-Ti multilayers is explained in this work. The evolution of the microstructure was traced using optical, scanning electron and transmission electron microscopes. The effectiveness of the bonding of the multilayered composites was investigated. The shape memory characteristics and the martensitic transition of the nickel-titanium nanocomposites were studied by differential scanning calorimetry (DSC). This method opens up new possibilities for designing various layered metal-matrix composites achieving the best combination of shape memory, deformability and tensile strength.publishersversionpublishe

Study of molybdenum stable oxide film in simulated body fluid

This study's main goal is to thoroughly compare the mechanical attributes and biocompatibility of the recently created titanium alloy Ti15Mo7Zr15Ta1Si (62% Ti, 15% Mo, 7% Zr, 15% Ta, 1% Si) to that of the pure metal Mo. The samples underwent a series of meticulous preparation procedures, including chip preparation, polishing, grinding, and cutting, to enable a thorough evaluation. These preparation steps were essential for ensuring the samples' consistency and uniformity, which allowed for accurate and reliable analyses of their mechanical and corrosionrelated properties. The samples' microstructure and surface morphology were also investigated using metallographic techniques, allowing a thorough examination of any potential flaws, grain boundaries, or phase compositions. Additionally, electrochemical tests were used to investigate the materials' corrosion resistance and electrochemical characteristics in environments that mimicked physiological conditions. The samples were subjected to a variety of electrochemical analyses, such as polarization curves and impedance spectroscopy, in order for the researchers to fully comprehend the corrosion behavior of the materials and their suitability for biomedical applications

Preliminary studies of new Ti alloys with different Mo content

This work aims to investigate the mechanical characteristics and biocompatibility of two novel titanium alloys, Ti15Mo7Zr15Ta1Si and Ti20Mo7Zr15Ta0,75Si.These samples have previously undergone cutting, grinding, polishing, and chipping. The studied samples were subjected to electrochemical, metallographic and corrosion behavior. Ti15Mo7Zr15Ta1Si and Ti20Mo7Zr15Ta0.75Si, the study samples, have demonstrated high corrosion potentials, lower corrosion rates, and consequently higher corrosion resistance. In summary, this study's data indicates that both alloys exhibit good corrosion behavior

BEHAVIOURAL ECONOMICS IN THE HEALTHCARE SYSTEM

The terminology used in the newly emerging field called “behavioural economics” and some of its contributors are discussed in this paper. Behavioural economics, in the primal used way of payment for the hospital care providers called DRGs, is discussed along three subsections of this research with some representations in the domain. In many situations, behavioural economics becomes economic psychology. Some of the psychological factors that impact over the economic agents in the health system are established and the key performance indicators of knowledge of any hospital are identified and calculated in this paper to provide an overview in this area. They were subject to statistical mathematical analysis to determine the confidence interval for the average length of stay of a surgical profile department. A series of conclusions were made at the end of this study leaving the session open for the future survey

Ответ на эпидемию туберкулеза в Республике Молдова

Response to the tuberculosis epidemic in the Republic of Moldova&Icirc;n plan național tuberculoza răm&acirc;ne una dintre problemele prioritare de sănătate publică, țara afl&acirc;ndu-se printre 18 țări din regiunea Europeană a OMS cu prioritare &icirc;naltă &icirc;n controlul tuberculozei și printre 30 țări ale lumii cu povară &icirc;naltă a TB MDR. &Icirc;n rezultatul implementării activităților de control a tuberculozei centrate pe necesitățile oamenilor: prevenire, depistare, tratament, din cadrul Programului Național de control a tuberculozei pentru anii 2016-2020, datele statistice demonstrează o ameliorare a indicatorilor epidemiologici TB pe parcursul ultimilor ani.Ответ на эпидемию туберкулеза в Республике Молдов