Veronica Despa - Academia.edu (original) (raw)

Papers by Veronica Despa

Scientific Bulletin of Valahia University - Materials and Mechanics

On base of obtained results in working [1], in a certain case one should take account the lineal ... more On base of obtained results in working [1], in a certain case one should take account the lineal chamfering of ribs upon the neutral fiber position and of the circular and plane plate bending rigiditybwith radial ribs. The illustration of the theoretical resultss is achieved on a given case.

IOP Conference Series: Materials Science and Engineering, 2020

DAAAM Proceedings, 2011

The scientific paper: New Concepts and Solutions of Micro-Nano-Mecahtronics and Micro-Nano Integr... more The scientific paper: New Concepts and Solutions of Micro-Nano-Mecahtronics and Micro-Nano Integronics focuses on a new systemic and synergistic view of the scientific knowledge and discoveries in the high-tech field implemented in micro-nano-processing micro-nano-engineering, micronano-technologies and high competitive and high added-value micro-nano-products. The essential results of the scientific paper are materialized into the conceiving and realization of mechatronic and integronic products and systems with applicability and flexibility in intelligent fabrication systems and in measuring, verification and control products

Romanian Review Precision Mechanics, Optics and Mechatronics, 2016

The paper is considering the mechanical properties of the composite material by traction and comp... more The paper is considering the mechanical properties of the composite material by traction and compression testing. The composite material is an epoxy resin matrix and is used in the manufacture of a hydrogen storage container. For this, several samples test were made of layered composite material on the

DAAAM INTERNATIONAL SCIENTIFIC BOOK 2012, 2012

This paper deals with strategies and scientific methods of design, development and implementation... more This paper deals with strategies and scientific methods of design, development and implementation of Adaptronics as part of key technology for the future, which will facilitate systems and high-tech micro-systems performance and know-how, and the relevance of most businesses.Design and application of Adaptronics were possible only because of Mechatronics and Integronics innovative developments, becoming active technology vector, structural and practical in most industries and hyper-intelligent products and systems, in technological purposes for change, improvement and evolutionary development of intelligent cybernetic manufacturing.

Scientific Bulletin of Valahia University - Materials and Mechanics

This scientific work continues the ideas and research from a previous work and presents the progr... more This scientific work continues the ideas and research from a previous work and presents the progressive conceptions of the future from Mechatronics to Cyber-Mechatronics and from Mechatronics Systems Cyber-Mechatronics Systems, as they are presented at the moment. It also tries to mention the scientific and technological advances in the above mentioned fields, the new and complex innovative concepts of science and Mechatronics and Cyber-Mechatronics. Anticipating the future, the power and flexibility that will flow from the ability to “program” the world around us should influence every aspect of the human experience.

Scientific Bulletin of Valahia University - Materials and Mechanics

The present study refers to a plane circular plate, provided with equidistant radial ribs, placed... more The present study refers to a plane circular plate, provided with equidistant radial ribs, placed on one side (fig. 1), these having the same geometry of the cross section (thickness and height) along their entire length (fig.2). There is a change in the position of the neutral fiber of the ribbed plate and also in its bending rigidity, along the radius of the plate, in different cases.

Proceedings of the International Conference of Mechatronics and Cyber-MixMechatronics – 2018, 2018

The working conditions of the composite materials used to produce machine parts lead to different... more The working conditions of the composite materials used to produce machine parts lead to different forms of wear. The fact that, for example, for a a kinematic coupling with sliding motion is often used a material with higher hardness (cast iron, steel) in combination with a material with a lower hardness (a composite material) there is the possibility of wear through abrasion and local plastic deformations. The paper proposes an analytical model for the determination of wear, depending on the angle of inclination of the roughness of the hard surface. The experimental wear investigations were made on cast iron disc (300HB hardness) at room temperature using a "pin on disc" machine, at and contact pressure and sliding speed. The composite consisted from cast and heat treated AlSi12CuMgNi and AlZn6MgCu matrix reinforced with Al2O3 and Graphite combined in different proportion, in the 0-5 volume percent range. The experimental results of the wear for the different materials are analyzed and compared to the analytical ones. The comparison of the experimental and the theoretical results confirms the veracity of the model and corresponds with many of the experimental results obtained in the specialized works.

Journal of Science and Arts, 2020

The guides of the machine tools, brakes, clutches there is the possibility of the intermittent mo... more The guides of the machine tools, brakes, clutches there is the possibility of the intermittent movement of stick-slip. This opens in the case of frictional couples with sliding motion, due to the low sliding speeds. Intermittent slip introduces vibrational phenomena and influences the uniformity of movement and the state of the surface of the couples due to their use. In this respect, the concerns related to the study of this phenomenon represent an interest in the machine building industry. The paper aims to achieve an original theoretical model for calculating the static and kinetic friction coefficients and its experimental verification on a stick-slip stand. The proposed theoretical model establishes the calculation relations of the static and kinetic friction coefficient and the connection between them taking into account the surface processing method. The originality of the approach is that the model is considered friction between the conical penetrator (steel material) and a ...

The necessity of studying and doing theoretical and applicable research in the metal micro- powde... more The necessity of studying and doing theoretical and applicable research in the metal micro- powders is motivated by the major importance of knowing their classification and characteristics, the attainment and investigative methods, the types of controlling the processes so as to achieve them and the areas based on their use. There are known various methods to form and realize the parts and products, respectively the subassemblies and assemblies of metal powders within conventional processing methods, characterized by less economical and performing parameters. Therefore, this paper aims to present the main modern technologies for rapid prototyping, analyzing different metal micro-powders, directions, technical and technological trends, as well as micro-elements, micro-parts and products ranging from high-tech category obtained by these technologies.

This paper is presenting a technical solution to produce and use oxy-hydrogen (HHO) as a fuel sup... more This paper is presenting a technical solution to produce and use oxy-hydrogen (HHO) as a fuel supplement. Using appropriate equipment, oxy-hydrogen is produced by water electrolysis and immediately transmitted to the engine. The introduction of hydrogen into the combustion chamber increases the efficiency of the combustion process and, therefore, reduces the fuel consumption and the polluting emissions, increasing the power and performance of the engine.

This paper is presenting a technical solution to produce and use oxy-hydrogen (HHO) as a fuel sup... more This paper is presenting a technical solution to produce and use oxy-hydrogen (HHO) as a fuel supplement. Using appropriate equipment, oxy-hydrogen is produced by water electrolysis and immediately transmitted to the engine. The introduction of hydrogen into the combustion chamber increases the efficiency of the combustion process and, therefore, reduces the fuel consumption and the polluting emissions, increasing the power and performance of the engine.

Proceedings of the 23rd International DAAAM Symposium 2012, 2012

The paper presents hard and software architecture of adaptonics in intelligent measurement engine... more The paper presents hard and software architecture of adaptonics in intelligent measurement engineering and in mechatronics and integronics systems for integrated automatic control, through cooperation between several scientific and technical disciplines, to meet growing and changing demands about modern systems and new products simultaneously improved with the lowest development time and with a higher flexibility and more efficient.

Proceedings of the 23rd International DAAAM Symposium 2012, 2012

The paper treats new concept of adaptronics for the future of advanced engineering and intelligen... more The paper treats new concept of adaptronics for the future of advanced engineering and intelligent automation, by bringing news and discoveries in the field of basic and applied science of mechatronics and integronics and as development vector of know-how in high-tech advanced domain by adapting scientific, complex, structural, functional and decisional of structures, products and systems, to change the operating mode of environment requirements, to control in active mode the vibration, the noise and the deformation, to recover energy from mechanics and inertial vibrating systems and to influence and monitories all structures of any kind.

Scientific Bulletin of Valahia University - Materials and Mechanics, 2018

In this paper is presented a comparative study regarding the synthesis of hydroxyapatite powders.... more In this paper is presented a comparative study regarding the synthesis of hydroxyapatite powders. The chosen method of synthesis of this biomaterial was chemical co-precipitation. The structure, size and morphology of the obtained powders were analyzed by X-ray diffraction, infrared spectroscopy - FTIR, dynamic light diffusion DLS tehnique and scanning electron microscopy-SEM. The results obtained were compared with those obtained on a commercial hydroxyapatite powder. Investigation methods have confirmed the synthesis of a high purity hydroxyapatite with a optimal degree of crystallization and crystallinity for the reconstruction and regeneration of hard tissue.

Scientific Bulletin of Valahia University - Materials and Mechanics, 2017

The scientific paper presents in summary the new concepts regarding the realization of cyber-mix-... more The scientific paper presents in summary the new concepts regarding the realization of cyber-mix-mechatronic systems with different industrial and societal applications.

Materiale Plastice, 2017

In this paper, optimum hot formation processing parameters for 31VMn12 steel were established, th... more In this paper, optimum hot formation processing parameters for 31VMn12 steel were established, the torsion deformation of 31VMn12 steel was investigated at temperatures from 900, 1000, 11000C and strain rates from 0.05 s-1 to 3 s. -1. There were studied the structural aspects of materials, in microstructures by electronic microscopy. The stress level decreases with increasing deformation temperature and decreasing strain rate, which can be represented by a Zenner-Hollomon parameter. The mathematical model presented in the paper describes the relationship of tension strain, voltage and temperature coefficient 31VMn12 steel at high temperatures. The stress-strain curves determined by the torsion test allowed the calculation of the Zenner-Hollomon parameter corresponding to the maximum stress. By using this parameter has established a set of equations that reproduce completely stress-strain curve, including the hardening, the restoration and dynamic recrystallization area. Comparisons ...

Scientific Bulletin of Valahia University - Materials and Mechanics

On base of obtained results in working [1], in a certain case one should take account the lineal ... more On base of obtained results in working [1], in a certain case one should take account the lineal chamfering of ribs upon the neutral fiber position and of the circular and plane plate bending rigiditybwith radial ribs. The illustration of the theoretical resultss is achieved on a given case.

IOP Conference Series: Materials Science and Engineering, 2020

DAAAM Proceedings, 2011

The scientific paper: New Concepts and Solutions of Micro-Nano-Mecahtronics and Micro-Nano Integr... more The scientific paper: New Concepts and Solutions of Micro-Nano-Mecahtronics and Micro-Nano Integronics focuses on a new systemic and synergistic view of the scientific knowledge and discoveries in the high-tech field implemented in micro-nano-processing micro-nano-engineering, micronano-technologies and high competitive and high added-value micro-nano-products. The essential results of the scientific paper are materialized into the conceiving and realization of mechatronic and integronic products and systems with applicability and flexibility in intelligent fabrication systems and in measuring, verification and control products

Romanian Review Precision Mechanics, Optics and Mechatronics, 2016

The paper is considering the mechanical properties of the composite material by traction and comp... more The paper is considering the mechanical properties of the composite material by traction and compression testing. The composite material is an epoxy resin matrix and is used in the manufacture of a hydrogen storage container. For this, several samples test were made of layered composite material on the

DAAAM INTERNATIONAL SCIENTIFIC BOOK 2012, 2012

This paper deals with strategies and scientific methods of design, development and implementation... more This paper deals with strategies and scientific methods of design, development and implementation of Adaptronics as part of key technology for the future, which will facilitate systems and high-tech micro-systems performance and know-how, and the relevance of most businesses.Design and application of Adaptronics were possible only because of Mechatronics and Integronics innovative developments, becoming active technology vector, structural and practical in most industries and hyper-intelligent products and systems, in technological purposes for change, improvement and evolutionary development of intelligent cybernetic manufacturing.

Scientific Bulletin of Valahia University - Materials and Mechanics

This scientific work continues the ideas and research from a previous work and presents the progr... more This scientific work continues the ideas and research from a previous work and presents the progressive conceptions of the future from Mechatronics to Cyber-Mechatronics and from Mechatronics Systems Cyber-Mechatronics Systems, as they are presented at the moment. It also tries to mention the scientific and technological advances in the above mentioned fields, the new and complex innovative concepts of science and Mechatronics and Cyber-Mechatronics. Anticipating the future, the power and flexibility that will flow from the ability to “program” the world around us should influence every aspect of the human experience.

Scientific Bulletin of Valahia University - Materials and Mechanics

The present study refers to a plane circular plate, provided with equidistant radial ribs, placed... more The present study refers to a plane circular plate, provided with equidistant radial ribs, placed on one side (fig. 1), these having the same geometry of the cross section (thickness and height) along their entire length (fig.2). There is a change in the position of the neutral fiber of the ribbed plate and also in its bending rigidity, along the radius of the plate, in different cases.

Proceedings of the International Conference of Mechatronics and Cyber-MixMechatronics – 2018, 2018

The working conditions of the composite materials used to produce machine parts lead to different... more The working conditions of the composite materials used to produce machine parts lead to different forms of wear. The fact that, for example, for a a kinematic coupling with sliding motion is often used a material with higher hardness (cast iron, steel) in combination with a material with a lower hardness (a composite material) there is the possibility of wear through abrasion and local plastic deformations. The paper proposes an analytical model for the determination of wear, depending on the angle of inclination of the roughness of the hard surface. The experimental wear investigations were made on cast iron disc (300HB hardness) at room temperature using a "pin on disc" machine, at and contact pressure and sliding speed. The composite consisted from cast and heat treated AlSi12CuMgNi and AlZn6MgCu matrix reinforced with Al2O3 and Graphite combined in different proportion, in the 0-5 volume percent range. The experimental results of the wear for the different materials are analyzed and compared to the analytical ones. The comparison of the experimental and the theoretical results confirms the veracity of the model and corresponds with many of the experimental results obtained in the specialized works.

Journal of Science and Arts, 2020

The guides of the machine tools, brakes, clutches there is the possibility of the intermittent mo... more The guides of the machine tools, brakes, clutches there is the possibility of the intermittent movement of stick-slip. This opens in the case of frictional couples with sliding motion, due to the low sliding speeds. Intermittent slip introduces vibrational phenomena and influences the uniformity of movement and the state of the surface of the couples due to their use. In this respect, the concerns related to the study of this phenomenon represent an interest in the machine building industry. The paper aims to achieve an original theoretical model for calculating the static and kinetic friction coefficients and its experimental verification on a stick-slip stand. The proposed theoretical model establishes the calculation relations of the static and kinetic friction coefficient and the connection between them taking into account the surface processing method. The originality of the approach is that the model is considered friction between the conical penetrator (steel material) and a ...

The necessity of studying and doing theoretical and applicable research in the metal micro- powde... more The necessity of studying and doing theoretical and applicable research in the metal micro- powders is motivated by the major importance of knowing their classification and characteristics, the attainment and investigative methods, the types of controlling the processes so as to achieve them and the areas based on their use. There are known various methods to form and realize the parts and products, respectively the subassemblies and assemblies of metal powders within conventional processing methods, characterized by less economical and performing parameters. Therefore, this paper aims to present the main modern technologies for rapid prototyping, analyzing different metal micro-powders, directions, technical and technological trends, as well as micro-elements, micro-parts and products ranging from high-tech category obtained by these technologies.

This paper is presenting a technical solution to produce and use oxy-hydrogen (HHO) as a fuel sup... more This paper is presenting a technical solution to produce and use oxy-hydrogen (HHO) as a fuel supplement. Using appropriate equipment, oxy-hydrogen is produced by water electrolysis and immediately transmitted to the engine. The introduction of hydrogen into the combustion chamber increases the efficiency of the combustion process and, therefore, reduces the fuel consumption and the polluting emissions, increasing the power and performance of the engine.

This paper is presenting a technical solution to produce and use oxy-hydrogen (HHO) as a fuel sup... more This paper is presenting a technical solution to produce and use oxy-hydrogen (HHO) as a fuel supplement. Using appropriate equipment, oxy-hydrogen is produced by water electrolysis and immediately transmitted to the engine. The introduction of hydrogen into the combustion chamber increases the efficiency of the combustion process and, therefore, reduces the fuel consumption and the polluting emissions, increasing the power and performance of the engine.

Proceedings of the 23rd International DAAAM Symposium 2012, 2012

The paper presents hard and software architecture of adaptonics in intelligent measurement engine... more The paper presents hard and software architecture of adaptonics in intelligent measurement engineering and in mechatronics and integronics systems for integrated automatic control, through cooperation between several scientific and technical disciplines, to meet growing and changing demands about modern systems and new products simultaneously improved with the lowest development time and with a higher flexibility and more efficient.

Proceedings of the 23rd International DAAAM Symposium 2012, 2012

The paper treats new concept of adaptronics for the future of advanced engineering and intelligen... more The paper treats new concept of adaptronics for the future of advanced engineering and intelligent automation, by bringing news and discoveries in the field of basic and applied science of mechatronics and integronics and as development vector of know-how in high-tech advanced domain by adapting scientific, complex, structural, functional and decisional of structures, products and systems, to change the operating mode of environment requirements, to control in active mode the vibration, the noise and the deformation, to recover energy from mechanics and inertial vibrating systems and to influence and monitories all structures of any kind.

Scientific Bulletin of Valahia University - Materials and Mechanics, 2018

In this paper is presented a comparative study regarding the synthesis of hydroxyapatite powders.... more In this paper is presented a comparative study regarding the synthesis of hydroxyapatite powders. The chosen method of synthesis of this biomaterial was chemical co-precipitation. The structure, size and morphology of the obtained powders were analyzed by X-ray diffraction, infrared spectroscopy - FTIR, dynamic light diffusion DLS tehnique and scanning electron microscopy-SEM. The results obtained were compared with those obtained on a commercial hydroxyapatite powder. Investigation methods have confirmed the synthesis of a high purity hydroxyapatite with a optimal degree of crystallization and crystallinity for the reconstruction and regeneration of hard tissue.

Scientific Bulletin of Valahia University - Materials and Mechanics, 2017

The scientific paper presents in summary the new concepts regarding the realization of cyber-mix-... more The scientific paper presents in summary the new concepts regarding the realization of cyber-mix-mechatronic systems with different industrial and societal applications.

Materiale Plastice, 2017

In this paper, optimum hot formation processing parameters for 31VMn12 steel were established, th... more In this paper, optimum hot formation processing parameters for 31VMn12 steel were established, the torsion deformation of 31VMn12 steel was investigated at temperatures from 900, 1000, 11000C and strain rates from 0.05 s-1 to 3 s. -1. There were studied the structural aspects of materials, in microstructures by electronic microscopy. The stress level decreases with increasing deformation temperature and decreasing strain rate, which can be represented by a Zenner-Hollomon parameter. The mathematical model presented in the paper describes the relationship of tension strain, voltage and temperature coefficient 31VMn12 steel at high temperatures. The stress-strain curves determined by the torsion test allowed the calculation of the Zenner-Hollomon parameter corresponding to the maximum stress. By using this parameter has established a set of equations that reproduce completely stress-strain curve, including the hardening, the restoration and dynamic recrystallization area. Comparisons ...