The paper presents some problems which might occur at different stages of the 9R(3RRR) planar mechanisms study (workspace characterizing, forward and direct kinematics, singularities analysis). At each of this stage, ...
The paper presents some problems which might occur at different stages of the 9R(3RRR) planar mechanisms study (workspace characterizing, forward and direct kinematics, singularities analysis). At each of this stage, it has been identified certain problem which can occur and that need more attention and effort to be solved. In the paper classical methods, and formulas, known from technical literature, have been used, but occurred situations was depicted detailed and illustrated by graphical representations.
In recent years, artificial feet based on soft robotics and under-actuation principles emerged to improve mobility on challenging terrains. This paper presents the application of the MuJoCo physics engine to realize a...
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Robots are essential for carrying out experiments and activities in Space environment, with or without human presence. This reduces the associated safety issues for humans. This paper attempts to provide an overview o...
Robots are essential for carrying out experiments and activities in Space environment, with or without human presence. This reduces the associated safety issues for humans. This paper attempts to provide an overview of the different applications of robotics in Space environment.
To enhance the performance of user personalized recommendation algorithms, this study offers a user personalized recommendation calculation based on deep learning network. Efficient and accurate personalized recommend...
To enhance the performance of user personalized recommendation algorithms, this study offers a user personalized recommendation calculation based on deep learning network. Efficient and accurate personalized recommendation algorithms can effectively increase user experience fulfillment. Considering user behavior, this research suggests a useful advice. We offer a preference network that might gather user preferences based on item qualities since customers intuitively convey their considerations based on some specific attributes of items. Moreover, weighted affiliation rules are used to identify these patterns to enhance the nature of recommendations because there are some sequential patterns in item purchases. We offer a preference network that might gather user preferences based on item qualities since customers intuitively convey their contemplations based on some specific attributes of items. Moreover, weighted affiliation rules are used to identify these patterns to enhance the nature of recommendations because there are some sequential patterns in item purchases. The methodology solves the sparsity problem and outperforms existing algorithms. Implementing a user behavior-based recommendation method, which gauges users' interests based on certain evaluations of item qualities, is the primary commitment. Furthermore, this strategy makes use of a sequential purchase pattern to raise the caliber of recommendations.
Correlating the education and training system with the evolution of today’s technologies is a complex but necessary process for training, improvement, and lifelong learning. Digital technologies are present today in ...
Correlating the education and training system with the evolution of today’s technologies is a complex but necessary process for training, improvement, and lifelong learning. Digital technologies are present today in all fields, and have become increasingly necessary in higher education institutions, not only to attract students, to bring them into a familiar environment, but also to initiate and improve their skills in what is an evolution in science. The digitalization of education services is necessary to have a more accessible, interactive, and personalized educational process and this also involves the use of digital technologies, elements that contribute to people’s self-education, and education outside of schools’ walls. In this paper we present aspects related to the digitalization of education, both from the perspective of educators and learners. It is a study carried out in two Romanian universities, the University of Craiova and the “Constantin Brâncuși” University of Târgu Jiu. The purpose of this work is to emphasize the necessity of digitalization, its importance, but also to emphasize the stage in which the two universities are now, in relation to what is meant by digitalization, who should be involved in the digitalization of the institution, what activities should be digitalized, knowledge of the digital signature concept or whether respondents use machine learning tools such as ChatGPT, or others. The results of this study reflect the opinion of the teachers and students of the two universities.
The paper aims finding the conjugate profile of a circular profile tooth from a gear mechanism with fixed parallel axes and constant transmission ratio. There are presented three manners of attaining the goal. The fir...
The paper aims finding the conjugate profile of a circular profile tooth from a gear mechanism with fixed parallel axes and constant transmission ratio. There are presented three manners of attaining the goal. The first two methods are based on the general methodology of gear wheel toothing by envelope machining presented in the first part of the work, considering elementary mechanisms with fixed axes and then a planetary one. The last method is based on applying the Reuleaux's fundamental law of gearing and has the advantage of obtaining both the conjugate profile of the gear with circular profile and the line of action which is useful in the study of gearing phenomena.
Because the surface engineering is becoming an increasingly viable alternative to the constructive changes made to improve the efficiency of internal combustion engines, have been proposed and tested various types of ...
Because the surface engineering is becoming an increasingly viable alternative to the constructive changes made to improve the efficiency of internal combustion engines, have been proposed and tested various types of coatings of some organs of internal combustion engines. One vital organ is the engine valves, which is subjected during operation to combined thermal, mechanical, corrosion and wear solicitations, which are leading to severe corrosion and complete breakdown. In this paper were analyzed aspects of valves wear and the active surfaces were coated using the atmospheric plasma spraying method (APS) with two commercial powders: Ni-Al and YSZ. Microstructural analyzes were made on these layers and also observations regarding the possibility of using them as thermal barrier and anti-oxidant coatings.
The paper presents a general grapho-analytical methodology for kinematical analysis of whichever plane cam mechanism. The main constructive solutions of plane cam mechanisms are reviewed and the solutions of kinematic...
The paper presents a general grapho-analytical methodology for kinematical analysis of whichever plane cam mechanism. The main constructive solutions of plane cam mechanisms are reviewed and the solutions of kinematical analysis are briefly presented. The most important difficulty in cam mechanisms analysis is the fact that when the follower has a curved face with random shape, the contact point between the cam and the follower has unknown trajectory. At the same time, the contact point moves both on the cam and on the follower contour, respectively. These displacements are required in the study of accelerations. The paper presents a method of analysis directly applicable for actual mechanism which allows finding all kinematical parameters of the mechanism. For structural reasons, there are separately approached the curved-face follower and the flat-face follower cases.
The paper presents an approach containing a package of several integrated programs, each of them being devoted to one of the principal problems regarding 3RRR planar parallel mechanisms: workspace, forward and direct ...
The paper presents an approach containing a package of several integrated programs, each of them being devoted to one of the principal problems regarding 3RRR planar parallel mechanisms: workspace, forward and direct kinematics and singularities problem. In order to perform workspaces coordinates and forward kinematics was used classical procedures, widespread and known in technical literature. For direct kinematics and singularities study, we used classical procedures also, but applied in a particular ways, related to each of them. Thereby, the proposed programs package represents a useful instrument in practical goals, one of them being didactical process of students' instruction in engineering, but also for research and design purposes. The paper is a refined and a extended research of an older one [24].
Thermal spray coatings are increasingly gaining ground in their use for various applications: protecting the surfaces from stresses, temperatures, corrosive or abrasive environments at various temperatures, repairing ...
Thermal spray coatings are increasingly gaining ground in their use for various applications: protecting the surfaces from stresses, temperatures, corrosive or abrasive environments at various temperatures, repairing surfaces and providing new features, etc. One of the important operations in defining the role that a thermal spray layer will have is finishing the surface after coating by mechanical machining. In this paper the surfaces of five thermal coated samples mechanically finished by two different methods were studied. Surface morphology was observed by electronic microscopy, the appearance being correlated with the micro-hardness and roughness of these surfaces before and after processing. It was observed that the choice of the method of processing depends on the hardness of the surface and its chemical composition.
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