Cristian Deac

Cristian Deac
Lucian Blaga University of Sibiu · Department of Industrial Engineering and Management

Ph.D.

About

50
Publications
3,462
Reads
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121
Citations
Citations since 2016
20 Research Items
85 Citations
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2016201720182019202020212022051015

Publications

Publications (50)
Article
Full-text available
According to statistics, road transportation is the most dangerous means of transportation and also the costliest in terms of human lives and material damage. The increase of road safety is a priority goal of the European Commission and an area of high interest for Romania, which is unfortunately placed very high in the hierarchy of countries with...
Article
Full-text available
The study and analysis of the phenomenon of road accidents, that generates risks for the life, physical or psychic integrity and health of humans, but also for material goods, cannot be considered complete without analyzing its dynamics over time and its potential evolution. In this regard, the current paper aims to analyze the general and specific...
Article
Full-text available
The realizing and improvement of road infrastructure, of modern road networks provides normal, safe and pleasant road traffic conditions and also help prevent road accidents. The road network, with its constructive characteristics, has to offer optimal conditions for the movement of vehicles, pedestrians and other categories of participants in the...
Article
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Castability is, along with biocompatibility, one of the most important characteristics of metallic materials used for dental prosthetic applications. In addition, the characteristics and performance of the employed casting machine are also decisive for the end result of the casting, especially when dealing with titanium or a titanium alloy. Startin...
Article
Full-text available
Starting from a new study on carbon monoxide and noise pollution levels in an important crossroads area of the city of Sibiu, Romania, the current paper uses the data to compare with data obtained during past studies carried out on the same area, allowing an assessment of the evolution of the two pollution indicators over time. The recent study, ca...
Article
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While cars and road traffic are an essential component of modern human society, the accidents that may occur in traffic are one of the largest sources of deaths and injuries. A first important step towards reducing these road accidents is the identification of their main causes. In the the current paper, the authors analyse the main causes of road...
Article
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Fatal car accidents are a major issue of concern for both the police, the local and regional administrations and all those involved in providing road safety. The current paper presents an analysis of the number of fatal car accidents on Romanian roads, in the context of the Road Safety Programme of the European Commission, emphasising the efforts b...
Article
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Establishing which metallic materials are suitable to be used for the protection of operators and machinery, when subjected to stress impact in the drilling industry, for surface exploitation, mines and quarries, is a complex process. Due to the harsh operating conditions, a careful evaluation of the various materials used is of utmost importance....
Article
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Noise pollution is one of the most important negative effects of road traffic, especially in cities. The current paper presents an attempt to reduce the noise level created by the road traffic along some main roads in the city of Sibiu, Romania by suggesting ways to optimize the traffic flow. The number of cars and the resulting noise levels were r...
Article
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The current paper details a computer-aided research of the emission levels in two areas of the city of Sibiu, Romania. The research started from the numbers of motor vehicles passing through key segments of those two areas, located at entry points into the city of Sibiu. Using the software package Synchro Studio 7 and SimTraffic 7, the targeted cro...
Article
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The current paper presents a computer-aided analysis of the way in which a natural gas storage created in a depleted gas deposit and the associated gas collection network are operated, both during the extraction phase and during the injection phase. In a first step, an analysis is carried out on a two-dimensional, nonstationary model for the gas st...
Article
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Starting from the fact that the natural gas engineering profession is generally associated with a high occupational risk, the current paper aims to help increase the safety of natural gas wells and reduce the risk of work-related accidents, as well as the occurrence of professional illnesses, by applying an assessment method that has proven its eff...
Article
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The accidental or historic contamination of soils with hydrocarbons, in areas crossed by oil pipelines or where oil- or gas-extraction installations are located, is a major concern and has significant financial and ecological consequences, both for the owners of those areas and for the oil transportation or exploitation companies. Therefore it is v...
Article
Whereas formerly metallic materials were used extensively and for various purposes in the machines manufacturing industry, nowadays new materials are sought that can replace the "conventional" machines manufacturing materials with new ones. This is especially challenging in areas where parts need to be able to withstand very tough conditions, such...
Article
During the tests for evaluating shock behavior for certain alloy steels, one of the stages consists of an analysis of geometrical and structural degradations. These degradations are functions of stress distribution, values, and module of plastic and elastic deformation energies involved. High values of kinetic energy generated at shock imposed the...
Article
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In the current paper the authors present some experimental researches regarding the depollution through combustion of soil samples that were contaminated with hydrocarbons. Determinations were carried out on chernozem-type soils with high germinative potential, artificially polluted with an oil-derived fraction with known characteristics and a clay...
Article
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The accidental pollution of soils with hydrocarbons due to leaks from oil pipes is an important environmental problem that needs to be tackled by applying adequate decontamination measures. However, in the case of historical pollution situations, it is important to know also how the pollution and the pollutants have evolved in the soil over time. T...
Article
Many parts used in the machines manufacturing industry need to present a high hardness value on certain areas and thus need to be subjected to heat treatments or thermochemical treatments such as plasma nitriding, while other areas can be left in their initial hardness state. Since applying plasma nitriding on all surfaces would be needlessly costl...
Article
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Incremental forming is a novel but promising procedure for the flexible manufacturing of parts starting from metal sheets. It could be very useful in the medical area and especially in orthopedic prosthetics, where each part needs to be very precisely made, but at the same time has to have a unique shape. In this context, the selection of the mater...
Article
The quality of the natural gas extracted from deposits and transported through pipelines is a major factor in achieving the desired heating properties of the gas. A big problem related to the quality is the presence of impurities such as dust, sand or water. These can be removed by using separators. This paper presents an analysis of the efficiency...
Article
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Due to the fact that it has been shown that students have difficulties in understanding the complex phenomena occurring at the flow of methane gas through pipes and faucets as taught in the classical, analytical manner, the current paper suggests the usage of the finite element method for aiding the teaching of these phenomena. This method allows t...
Conference Paper
The realising of complex parts by welding together and then deep-drawing metal sheets made of different steel types or even different metal types can have many advantages, such as decreasing the part's weight, reducing the manufacturing costs and an increased dimensional precision. In order to benefit from these results, a detailed knowledge of the...
Article
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This paperwork deals with a low-cost actuation solution, based upon induction motors, which was seldom used in the motion control systems, especially for the machine tools feed drives. A simulation approach, based upon a mathematical model of the induction motor, for tuning the controllers of the systems is presented. Experimental researches develo...
Article
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The paper presents the optimization of a Laser Cutting System for 3mm Mild Steel using the Design of experiments (DOE) and Taguchi methods. The optimization was conducted in an operational manufacturing environment and was based on the design of a L16 Taguchi design experiment. The laser parameters (input) was feed rate, gas pressure, power, freque...
Conference Paper
The paper analyses some of the commercially available solutions for casting small-size metallic parts and outlines possible solutions that would reduce the cost of such systems while maintaining a high performance level. high performance level. One typical application area for small-size parts is human prosthetics, so the commercial casting machine...
Article
In this paper the authors intend to examine by numerical simulation one of the newest methods for obtaining the knee condylar surface, namely by incremental forming starting from a commercially pure titanium (CP Ti) sheet. In order to study the influence of the geometrical parameters, the authors chose to vary the material thickness, the punch diam...
Article
The paper presents a study based on the experimental research on the surface quality of the medical implants used for the partial resurfacing of the femoral condylar surface of the knee obtained by single point incremental forming process. The present paper discusses the measuring of the roughness of parts obtained through the previously mentioned...
Article
Nowadays, there are more than 800 different alloys used for the casting of dental prosthetic parts. Choosing the right one from this wide offer can pose problems to both dental technicians and customers. The current paper therefore analyses in first place the most important parameter in this regard - the material's castability, presenting a new tes...
Article
Nowadays, simulation and modelling software packages have become standard instruments in many areas of industrial engineering. However, in the case of processing by casting, most current software applications are targeting the industrial manufacturing of large-size parts and thus are less suited for the study of small-size parts such as the ones em...
Article
Certain areas of machined parts need to be protected against hardening induced by thermochemical treatments such as plasma nitriding (ion nitriding). When plasma nitriding is applied to metallic parts that have a local paint-based protection, the elementary fundamental physical-chemical processes that take place at the cathode change significantly....
Article
Full-text available
Medical dictionaries define the ankle-foot orthosis (AFO) as follows: a brace (usually plastic) worn on the lower leg and foot to support the ankle, hold the foot and ankle in the correct position, and correct foot-drop. People, who suffer from a foot-drop, or the inability to raise the foot, often wear an ankle-foot orthosis to assist in clearing...
Article
Even if modern processing technologies seem to have gained much ground during recent years, more conventional ones, such as casting, continue to retain their well determined area of applications, given the advantages offered in this regard. One major problem is that many aspects related especially to the casting of small-size parts, continue to be...
Conference Paper
Full-text available
The paper aims to detect the cultural dimensions of some representative institutions from the city of Sibiu, Romania, in the context in which in 2007 this city was declared European Capital of Culture. For this, it was started from the analysis of the organisational culture of the Engineering Faculty of the "Lucian Blaga" University of Sibiu and th...
Article
This paper presents a study regarding the influence of the geometrical parameters of the incremental forming process on the forces developed in the process, on the precision and the surface quality of the parts obtained through it. A study based on the experimental research referred to in the single point incremental forming (SPIF) process was used...
Article
The paper analyses the conditions of realising highprecision cutting operations of steel sheets by means of numerical-controlled laser cutting machines, studying the various factors that influence the positioning and contouring precision under certain conditions. The findings of the experimental researches presented in this paper will be used for i...
Article
The paper presents some considerations on the process of separating nonferrous metals from solid residues, using the method of magnetic separation in specially designed separators. This method is based on the induction, in the nonferrous particles, of eddy currents generated by a variable magnetic field originating in a rotating barrel. The efficie...
Article
Full-text available
Nowadays, there are more than 800 different alloys used for the casting of dental prosthetic parts. Choosing the right one from this wide offer can pose problems to both dental technicians and customers. A parameter describing the suitability of an alloy for the usage in a dental cast restoration would allow a more informed choice and an overview o...
Article
The paper describes the e-learning study programme "CELGAS", unfolded as a Leonardo da Vinci Project, from the point of view of its Human Resources Management and Quality Management module, organised by the "Lucian Blaga" University of Sibiu, Romania. The international programme is unfolded jointly by universities and research centres from Poland,...
Article
Full-text available
The paper presents a comparison study based on the simulation by the finite element method (using the Ls-Dyna software) on three different incremental sheet metal forming process alternatives for medical implants used for the partial resurfacing of the femoral condylar surface of the knee. The paper also studies the influence of the material thickn...
Article
Full-text available
Engineering education is an educational branch that currently concerns all governments seeking new solutions for the global economic crisis that we are going through. The engineer is expected to come up with consistent results for diminishing the energy consumptions, for reducing the greenhouse effect etc., in general for everything that is related...
Article
Full-text available
Abs tract The paper presents a mathematical model used for the describing of the processing of G-type metallic carbides through electro-discharge machining. Based on the physical-mechanical and technological parameters, equations can be devised which, when the y are transposed in a graphic way, can outline the optimal processing area.
Article
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The paper presents the results of experimental researches on the plasma carbonitriding of the refractory steels 15SiNiCr200 and T35NiCr260. The effects of carbonitriding are emphasised through the hardness variation in the treated layer, through structural changes and through the behaviour at corrosion in oxidant environments and high temperatures....
Article
Full-text available
The Romanian Agency for Quality Assurance in Higher Education (ARACIS), set up in 2006, required all universities to perform quality-related self-analysis and self-assessment. The quality of education provided to the students relies on the quality of academic staff, as a result of the analysis of three components: student assessment, peer assessmen...

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Project (1)
Archived project
One core objective of EU-StORe is to conceptualise and implement a European inventory of open learning resources; to analyse open learning scenarios and open learning resources; and to create shared and common European standards and guidelines for open learning. Open education and open learning resources are one of the main educational topics in the EU. OER are distributed on a global market. Therefore, Pawlowski argued that it is crucial for Europe to engage a broad community in cross-border collaboration to be successful. In the vision paper ´Open Education 2030´ (see p.78), he comes up with six recommendations: (a) to create an inventory of OER, (b) to integrate existing communities, (c) to integrate curricula, (d) to create regional networks, (e) to create global outreach programs and (f) to support open education policy building! It is based on the recommendations of Pawlowski and the EU and builds an inventory of online learning resources Moreover, through the project, experts will analyse these materials and courses and create standards for open learning activities, which provide a high quality standard/benchmark?. This will lead to the development of guidelines and standards that can be used (a) to create open learning scenarios in the future and (b) to rate existing open learning activities and resources. To integrate this information in the European learning community, the standards will be provided on an online platform where the inventory is also accessible. This will also act as a basis to foster curricular design and the work of regional networks. The guidelines and standards will be combined with policy papers, which engage ministries, the European Commission and multipliers in the field of education in different European countries in the process of implementing the standards. One benefit of using your newsletter as a promotional tool is that you can reuse content from other marketing materials, such as press releases and market studies.