bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on characteristic of Fricke xylenol gel dosimeter: application for dose evaluation in radiotherapy
Authors: Choosin P , Tippayamontri T , Ninlaphruk S , Pungkun V
Published: September 2019

Accurate assessment of the radiation absorbed dose delivered to a tumor and different organs is a potentially importance issue in clinical radiotherapy. The aim of this study is to evaluate the effectiveness of the Fricke Xylenol Gel dosimeter (FXG) to the gamma radiation from Co-60. With this aim, the dose response of FXG and its behavior have been investigated. The sensitivity and accuracy of FXG were validated by irradiating FXG with the gamma radiation at 1-200 Gy. To evaluate the long- and short-term consistency and reproducibility of FXG, the optical density was measured at 24, 48 and 120 h after irradiation. Light absorbance spectra were analyzed from 350-700 nm. Spectrophotometric measurement of FXG demonstrated the linearity up to 30 Gy, and then gradually reached a plateau. FXG showed a good stability over a period of 120 h after exposure to gamma radiation. FXG showed a high reproducibility which is in comparable to that of obtained from the ionization chamber. The FXG showed high accuracy, sensitivity and reproducibility, thus enabling determination of absorbed dose from the external beam radiotherapy.
Influence of gamma ray on elastic and structural properties of recycled window glass doped with chromium oxide using ultrasonic contact technique and FTIR spectroscopy
Authors: Gunhakoon P , Sopapan P , Laopaiboon J , Jaiboon O , Laopaiboon R
Published: September 2019

Glasses of system 90RWG – 10Na2O - x CrO3 (RWG stands for recycled window glass and x = 0, 0.001, 0.01, 0.1, 1 mol %) have been prepared using the melt-quenching technique. The Archimedes principle was used to measure density of the glass samples, and then these data were used to calculate their molar volumes. Ultrasonic velocities at room temperature were measured using the ultrasonic contact technique at 4 MHz frequency. Elastic moduli have been calculated. The obtained results were compared with theoretical values which were calculated from the Makishima-Mackenzie model. The glass samples were gamma irradiated using a 60Co gamma cell at the total gamma dose of 1,000 Gy. Then the effects of gamma ray on structural properties of the glasses were investigated by means of their elastic moduli. FTIR spectra were also recorded to support the result from ultrasonic contact technique. The results show that there are significant changes in number of NBO in the structural glass due to an addition of the chromium oxide and gamma irradiation.
Simulation of plasma in scrape-off-layer region in Thailand Tokamak 1 using extended two-point model
Authors: Kongkerd R , Wisitsorasak A
Published: September 2019

As Thailand has been preparing to operate a small tokamak in which the device will be upgraded from HT-6M tokamak, the quantitative information about the plasma in the edge and at the surface of a limiter would be insightful for planning future experimental operations. In this work, we employ an extended two-point model to investigate the particle and heat exhausted from the core to the limiter for the tokamak with nominal parameters of HT-6M. The model assumes that the transports of heat and particle from the core enter the scrape-off layer at the outer midplane (upstream point). They then travel to the limiter along the magnetic field line. In this scrape-off layer region, both the conductive and convective transport are considered. The particle sources are only present near the limiter and the conservation of momentum is assumed. Thus, in the steady state, the transport equations can be reduced to a set of nonlinear equations that relates the density and temperature at the upstream to those at the limiter. For Thailand Tokamak, as the density at the upstream point is increased from 0.1 × 1019 to 3.5 × 1019 m−3 and power through separatrix is 0.2 MW, it is found that the electron temperature at the limiter surface is reduce from 250 to 10 eV. When the upstream density is greater than 2.7 × 1019 m−3, the particle flux reaching to the limiter significantly decreases in which this suggests for the plasma detachment.
Feasibility study of neutron production at SLRI beam test facility
Authors: Kittimanapun K , Juntong N
Published: September 2019

SLRI Beam Test Facility (SLRI-BTF) has been constructed in order to increase usage of the Siam Photo Source injector. SLRI-BTF aims to provide electron test beams for calibration and testing of high-energy particle detectors and diagnostic instrumentations. The test-beam energy varies from 40 MeV to 1.2 GeV with adjustable intensity from a few to several millions of electrons per repetition rate. Since the test-beam energy is sufficiently large, the electron test beam can be used to produce photoneutrons resulted from collision of high-energy electrons to metal targets. Similar to the electron test beams, this neutron source will be utilized for calibration and testing of neutron detectors and instrumentations. In this work, the neutron production and its angular dependence has been investigated using the PHITS simulation code. The results show that photoneutrons generated by collision of the high-energy electron beam on a tungsten target are in range of intermediate and fast neutrons or 0.01 - 10 MeV with peak contribution at 0.6 ± 0.1 MeV and uniformly distributed in angular direction. For the primary beam of 108 electrons per spill at SLRI-BTF, the photoneutron flux is predicted to be around 50 neutrons/cm2. Based on this study, the possibility to service a neutron source for users in the future will be determined further.
Improvement of regulatory process for import and export of radioactive sources through digital transformation
Authors: Srikongpan P , Nakkaw P , Chaiwat A
Published: September 2019

Radioactive sources have various utilization in many fields in Thailand including medical, industrial, research and education. Thailand’s regulatory body, Office of Atoms for Peace (OAP) has been regulating the imports and exports of radioactive sources under the Atomic Energy for Peace Act, B.E. 2504 (1961) and Nuclear Energy for Peace Act, B.E. 2559 (2016) through the licensing process and customs declaration process. Under these processes, licensees must report their imports and exports by submitting confirmation documents to the OAP within 15 days. To improve these processes, the OAP and Thai Customs have collaborated through a government and government partnership (G2G), in July 2016, to initiate electronic data sharing in a digital format called License Per Invoice (LPI), which includes all the necessary information for verification of import and export, such as radioactivity, port number, and Harmonized System Code (HS Code). This study has shown significant data of time-consuming reducing on paperwork process spent 30.32 days turn into 6.95 minutes by LPI/NSW system. The new process enhances information accuracy, integrity, security, as well as increasing regulation efficiency, reducing the amount of paper work, and facilitate all stakeholders greatly for import and export of radioactive sources in Thailand.
Evaluation of radiation safety for ionization chamber smoke detectors containing Am-241
Authors: Malain D , Kanchana P
Published: September 2019

The safety assessment was carried out for ionization chamber smoke detectors (ICSDs) containing 241Am under normal use and accident scenarios. The internal and external doses were estimated using dose coefficients and associated calculations. In normal use of the ICSDs with the activity in a range of 0.002–1 MBq per ICSD, the external doses to an individual for installation, use and maintenance were found to lie in the range of (0.01-4.17)×10−3 (0.017 - 6.76)×10−1 and (0.006-2.5)×10−2 μSv/y respectively. The activity of 241Am for domestic smoke detectors contains approximately 40 kBq per ICSD. The corresponding committed effective doses to a fire fighter during a fire and for cleanup operation after a fire via inhalation were found to be 6.1×10−5 and 0.024 μSv/y respectively. The committed effective dose equivalent to an infant via ingestion would be 148 μSv/y. The doses arising from normal use and incidents of ICSDs are less than 10 μSv/y and 1 mSv/y respectively which do not exceed the dose criteria for exemption from regulatory control. It could be concluded that the resultant radiological risk are estimated to be very low and lower than 1 mSv which is the annual dose limit to a member of the public for the safe use.
Disentangling the causes of the 1816 European year without a summer
Authors: Schurer Andrew P , Hegerl Gabriele C , Luterbacher Jürg , Brönnimann Stefan , Cowan Tim , Tett Simon F B , Zanchettin Davide , Timmreck Claudia
Published: September 2019

The European summer of 1816 has often been referred to as a ‘year without a summer’ due to anomalously cold conditions and unusual wetness, which led to widespread famines and agricultural failures. The cause has often been assumed to be the eruption of Mount Tambora in April 1815, however this link has not, until now, been proven. Here we apply state-of-the-art event attribution methods to quantify the contribution by the eruption and random weather variability to this extreme European summer climate anomaly. By selecting analogue summers that have similar sea-level-pressure patterns to that observed in 1816 from both observations and unperturbed climate model simulations, we show that the circulation state can reproduce the precipitation anomaly without external forcing, but can explain only about a quarter of the anomalously cold conditions. We find that in climate models, including the forcing by the Tambora eruption makes the European cold anomaly up to 100 times more likely, while the precipitation anomaly became 1.5–3 times as likely, attributing a large fraction of the observed anomalies to the volcanic forcing. Our study thus demonstrates how linking regional climate anomalies to large-scale circulation is necessary to quantitatively interpret and attribute post-eruption variability.
Focusing device based on overconstrained mechanism
Authors: Racila L D , Dumitru I , Tutunea D , Matei L , Geonea I , Otat O , Racila M
Published: September 2019

The paper presents an application based on a very special 6R overconstrained mechanism. This mechanism is started from 6R Wohlhart symmetric mechanism, not in its classical spatial position but in a different one, with three non-adjacent joints constrained to remain in a fixed plane. This disposition allows the conception of an interesting device, a focusing table, capable to obtain a good accuracy.
Organizational factors that influence job satisfaction in a company from automotive industry
Authors: Moraru G M , Popa D
Published: September 2019

The aim of this paper is to present the most important organizational factors that influence job satisfaction in many companies from automotive industry. Therefore, we have firstly analyzed several theoretical aspects in the specialty literature regarding the factors that influence employee satisfaction. Secondly, we have developed a research based on questionnaire in a branch plant of an international organization in automotive industry. There are many factors that place the automotive industry ahead of other areas of activity in terms of maintaining high work satisfaction among employees. We have found which of these factors have a great impact on job satisfaction in the studied branch plant: the lunch vouchers received by employees, the microclimate at work (light, silence, lack of emissions etc.), the relationship with hierarchical boss, the work schedule (duration and time interval), the organization’s support in solving personal problems, the clarity of the received tasks and others.
The dynamic capabilities framework implementation in innovation and creative ecosystems
Authors: Avram E , Avasilcai S , Hutu C A , Bujor A
Published: September 2019

The arising concern for the inter-industry collaborations was concretised through the continuous development of new collaborative structures as it is the case of business ecosystems emergence. The use of open innovation in existing ecosystems became an essential trigger for the emergence, defining and development of dynamic capabilities. Consequently, these capabilities were used as the most relevant resources in value networks evolution as they defined and created new ways for opportunities exploration and exploitation especially within existing ecosystems. From this point of view the current research seeks to identify and define what are dynamic capabilities, to present the existing framework of capabilities analysis and to understand how it is used in practice within existing ecosystems. Also, this research seeks to uncover how collaborative efforts and the use of innovative technologies influence organisational growth.
Lead time reduction and increasing productivity by implementing lean manufacturing methods in cnc processing center
Authors: Gherghea I C , Bungau C , Negrau D C
Published: September 2019

Growing competitiveness of manufacturing companies has led companies board to look for new innovative solutions to increase the productive efficiency. More and more companies are looking to maximize profit through different ways, some of them use classical methods that are focused on increasing production capacity, expanding the product portfolio, manufacturing and marketing campaigns, other operational activities, are implementing modern techniques to reduce losses. This paper propose to present the way that productivity is increased by reducing lead time through Lean Manufacturing method implementation. For this purpose a piece will be manufactured using a CNC processing center, which will contribute significantly to processing the part at a higher precision, and at the same time eliminating the down times. To highlight the contribution and the efficiency of the CNC processing center, will be present the classic production method using a classical milling machine, respectively FUS 22, the method that was also implemented, according to this case study. To analyze and graphically illustrate these two production methods, respectively classic and modern methods, VSM will be built, then the 2 methods will be compared.
Kinematic modeling of a 6R industrial robot
Authors: Ratiu M , Rus A , Balas M L
Published: September 2019

In this paper, we present the process of kinematic modeling and simulation, in ADAMS MBS of MSC software, of an articulated robot with six revolute joints, through direct and inverse kinematics. First, by using the STEP function, we define a spatial trajectory of the end effector, and, through inverse kinematics, we determine the motion laws of the six revolute joints. Then, we apply the inverse process on another virtual model of the same robot, by imposing the motion laws to the joints, to obtain the desired trajectory of the end effector, through direct kinematics. This work is a small part of our research regarding modeling and optimization of the industrial robots’ motion.
Estimation of braking capability for two distinct auxiliary engine brake systems paired with an exhaust brake
Authors: Manolache-Rusu I C , Glovnea M , Suciu C
Published: September 2019

Nowadays vehicles achieved an important increase in energy efficiency. Though highly desirable, in the case of heavy transport vehicles, this leads to a pronounced deficiency in their native deceleration capacity. This deficiency is more pronounced when traveling down slopes with important inclination, or when the traveling mode is with multiple starts and stops, as in the case of city travel. In such operating conditions, using only the conventional braking system can induce important thermal overloads, reducing braking efficiency, or even rendering the system useless. In order to limit this deficiency, auxiliary braking systems are often provided for heavy transport vehicles. Such systems serve to obtain a negative torque at the engine’s crankshaft thus actively slowing the vehicle. The present paper aims to simulate the braking capacity obtained by using a combination of two distinct engine brake systems: the Jake brake and the Bleeder brake. The obtained results provide information regarding the evolution of thermodynamic parameters over the engine working cycle, with applications to optimize the deceleration capacity of vehicles that use diesel engines. Based on the presented data, it can be determined which of the analyzed auxiliary braking systems may be best suited, for implementation on particular road vehicles.
Experimental research on Diesel Particle Filter (DPF) in relation to the fuel type
Authors: Jurchiş B M , Borzan A I , Băldean D L
Published: September 2019

The experimental research is developed to validate or to dismiss theoretical suppositions considering the efficiency of particulate matter filters for internal combustion engines. This paper is pointing out the ideas of a practical test regarding soot impact upon the diesel particle filter from after treatment system, supplied with different fuels in operation mode. Measurements are recorded with after treatment system scanner and subsequently the experimental data are processed and graphically presented using digital module. Experience and know-how concerning the after-treatment system applied to the exhaust pipe of a Diesel engine is extremely useful in modelling the protocol for sustainable technical design of the automotive powertrains. The present paper outlines an applied process of controlling and analysing at least four parameters defining the clogging level of an actual diesel particle filter in K9K792 euro 5 internal combustion engine in relation to the fuel type. Engine supplied with Diesel standard has a wide range of clogging, but when changing to more blended fuels containing biodiesel from soy methyl ester and ethanol, the after treatment process is influenced significantly. The experimental testing is designed to reiterate for each fuel type in real time and after a distance of one thousand kilometres – in engine speed regime of two thousand revolutions per minute.
Performance evaluation of the support bush manufacturing line by modeling and simulation
Authors: Blaga F S , Stănăşel I , Pop A , Hule V , Buidos T
Published: September 2019

Improving the performance of manufacturing systems is the objective of management activities. The paper presents how this objective can be achieved by modeling and simulation. Base on the manufacturing process of the part support bush it is modeled the production line. Modeling is done using the TECNOMATIX PLANT SIMULATION program. Using the first model, by simulation, it was found that the resulting production after eight hours was relatively reduced: 28 pieces. Under these conditions, an additional welding post was introduced in the second model. It results in double the production and also in narrow places. The third model is designed in such a way that bottleneck is eliminated, and there is also an increase in production.
Mechanical design and 3D printing process of an exoskeleton used for elbow joint rehabilitation
Authors: Tătulea I A , Drugă C N , Şerban I
Published: September 2019

This paper presents the design and 3D printing process of the components which form an exoskeleton robot used in elbow joint rehabilitation. In the first part of the paper are presented a series of exoskeleton models used to rehabilitate the upper limb (4 DOF and 7 DOF). The second part is entirely dedicated to the mechanical design process of the components which form the device. In the last part of the paper are presented a series of aspects related to the physical achievement of the device using rapid prototyping technology (3D printers, filaments of material, execution time, assembly of components etc.). In this case was chosen the natural PVA filament from Ultimaker that dissolves in water. The dissolving process of the support material was analysed over a 24 hours period, in which the pieces were immersed in an aquarium. This paper represents a part of a much wider project of designing, creating and testing a bio mechatronic device used in rehabilitation of elbow joint.
Experimental research regarding some dynamic parameters determination for sandwich bars reinforced with carbon fiber
Authors: Miriţoiu C M , Burada C O , Tărâţă D F , Bolcu A , Ionică V
Published: September 2019

For this study, we have built some composite sandwich bars with polypropylene honeycomb core reinforced with carbon fiber. We have clamped the bars at one end and we left them to vibrate freely. From the free vibrations we have determined the damping factors per unit mass and length, loss factor, dynamic Young modulus, dynamic stiffness and the frequency of the first eigenmode. The general conclusions obtained from the vibrations results show tat the sample width can influence the damping coefficient, by the fact that it determines the surface in which the air friction acts on the sample. The sample mass or specific linear mass influence the damping factor by the fact that the samples with higher mass and width, the deformation energy which is stored in the sample through the initial deformation, is dissipated in a larger quantity of material. An influence may occur due to the sample rigidity, explained by the fact that a force initially applied to the sample produces a smaller deformation if the stiffness is higher.
Considerations on the road safety situation in Sibiu county, between 2010 and 2019
Authors: Gligor A
Published: September 2019

Road transportation has become a significant part of human society and interactions, especially from an economic and social point of view. Road accidents represent major disruptions in this regard, and therefore, nowadays, road safety management is a critical topic. Sibiu county is located in a critical position in Romania, at the crossing of major North-South and East-West roads. Starting from these facts, the current paper aims to present an analysis of the road accidents that occurred in Sibiu county from January 1st, 2010 to December 31st, 2018, focusing on the number of victims but also on the causes generating or favoring the generation of these accidents.
Numerical analysis of the SOC factor variations’ influence on the autonomy of an electric vehicle
Authors: Scurtu L , Varga B O , Mariasiu F , Buidin T , Borzan Adela , Moldovanu D
Published: September 2019

Electric vehicles are considered to be the immediate solution to drastically reduce the pollutant emissions from the road transport sector. However, one of the barriers of the massive penetration of the automotive market by electric vehicles is related to consumer/driver anxiety linked to the autonomy of electric vehicles. Autonomy depends directly on the battery technology that equips the electric vehicle, and from this point of view, the technology based on Li-Ion electrochemistry is the most accepted. This article presents a study by numerical simulation methods on the functional performance (autonomy) of an electric vehicle equipped with three different types of batteries (LiCoO2, LiFePO4, and a classic Acid-lead), as they have a low battery energetic charge. The obtained results showed that there are differences between the various technologies considered, the most efficient one being the LiCoO2 battery type.
Intake and exhaust pipe optimization for an internal combustion engine
Authors: Magdas V B , Moldovanu D , Mastan D C
Published: September 2019

Nowadays the stringent exhaust emission limitations of the internal combustion engines force the researchers toward an optimization process of new/prototype engines; but for limiting the overall emissions of an entire fleet of vehicles, an optimization of existing engines is also a right research direction. Solutions for this optimization process may come from using biofuels made from different plants that produce oxygen via photosynthesis during their vegetative state and therefore compensate the CO2 in the internal combustion engine exhaust. Other solutions include better exhaust treatment materials and devices. The current paper proposes a study on optimizing the intake pipe and exhaust pipe of a given internal combustion engine (Opel Astra F, code C18NZ, the production year 2000) using Lotus Engine Simulation software. First the model of the engine was implemented and validated with the full load power and torque variation. For the intake and exhaust the geometrical dimensions were then varied and an optimum was obtained.
Refueling strategies of autonomous hybrid vehicles
Authors: Zöldy M , Szalay S , Szalay Z , Zsombók I
Published: September 2019

Fuel consumption prediction and recharging strategies are crucial fields of autonomous hybrid vehicles. In our paper based on literature review the currents trends of hybrid vehicles are compared and working principals of hybrid strategies created for different types of hybrid drivetrains were described. The fuel management, basics of the range estimation in hybrid vehicles are displayed. Analyzations of the factors affecting the fuel consumption and energy management were made, along with an estimation of the order of magnitude of these factors, based on experiments done by EPA. Main fuel consumption influencers are listed and a real word test is carried out in a highway measurement. It was focusing on the affection on the fuel consumption, caused by the additional consumers of the vehicle has been carried out. Evaluation of this measurement was made and conclusions were drawn about the efficiency changes of the vehicle.
Study regarding the influence of passive safety systems on the occupant in the case of Automatic Emergency Braking System activation
Authors: Radu A I , Trusca D D , Toganel G R , Benea B
Published: September 2019

The aim of this paper was to analyze the injury level of the occupants of a vehicle in the case using the AEB system to reduce the velocity of a front-back collision by utilizing virtual simulations in PC-Crash software. This was achieved by conducting simulation at different velocities and 3 passive safety systems configurations. The velocities tested were 70, 75 and 80 km/h to observe the speed reduction of the vehicle in a collision by the AEB system. Also, the occupant was configured in 3 types of scenarios, when the occupant does not have the seatbelt or airbag, when only the seatbelt is used and when both seatbelt and airbag are activated. The results revealed a great speed reduction by the AEB system, reducing the impact velocity and also the occupant presented a reduced injury risk when both passive safety systems are active.
Vehicle dynamics influence on traffic safety in case of a certain route deceleration
Authors: Oţăt O V , Oţăt V , Racilă L , Geonea I , Tutunea D
Published: September 2019

The present paper is aimed at determining the kinematic and dynamic parameters of a vehicle during braking on a road in alignment. Closely related to the determining the braking capability, we need to consider the key parameters that characterize the maximum braking capabilities of a vehicle, i.e. maximum deceleration, minimum braking space and minimum braking time. Hence, resorting to the ADAMS Car software platform, we carried out a case study to determine the kinematic and dynamic parameters of a vehicle in the braking situation on the road in alignment. The virtual modeling developed within our case study consisted of five full-vehicle analyses of the braking situation on a track in alignment. The initial speeds of the vehicle and the gearbox shift varied for each of five analyzed cases, while the rest of the input parameters did not change. The initial speeds considered were: 30 km/h, 50 km/h, 80 km/h, 100 km/h and 120 km/h. Following the numerical processing, we set out to determine the forces and moments at the wheel at the braking moment. The processing of the numerical results envisaged a comparative analysis of the vehicle kinematic and dynamic parameters for the five cases analyzed.
Restoration and PLC control of a robot cell compatible MP-11 industrial manipulator platform
Authors: Hegyi G , Erdei T I , Husi G
Published: September 2019

The designing and usage of newer and newer tools and devices is an unavoidable part of industrial development. The robots employed this way either replace human work, or replace previous, obsolete robots. This advancement might cause otherwise functional robots to be discarded, or otherwise lost. Such robots might still be in usable condition after a suitable refurbishing, and their limitations can be alleviated by integrating these devices into a robot cell. In my project, I have set the goal to restore such a machine, which goal includes the full mechanical and electrical overview of the device and replacing its missing controller. The robot itself and other various resources necessary were provided by University of Debrecen, Faculty of Engineering, department of mechatronics.
CodeSys modeling of an industrial cell, and linear drive control with PLC & ATmega2560 microcontrollers for testing and improvement purposes
Authors: Pajkos T , Erdei T I , Husi G
Published: September 2019

In this document, the upgrades of the robotics lab at the University of Debrecen, faculty of engineering will be detailed. As the first part of the task, the conversion and upgrade of the KUKA KR5’s cube holder were done. As a result, the cube holder (feeder) can count the added and removed cubes, while also displays their current amount in the holder. The completion of the other task enriched the existing robot cell with the addition of a liner drive powered system, complete with a test panel, which can even be used for educational purposes in the future. And lastly, as a summary, the simulation of a manufacturing process in the robot cell was also completed.
Some aspects of gas meter quality and analyzing the sustainability of a gas meter element
Authors: Ilea P , Săvescu D , Stoica A
Published: September 2019

This paper refers to analyzing some components of a natural gas meter. There is a question of making the gas meter design and execution process more efficient. A description of the components of a gas meter is made. It is proposed to improve the natural gas meter. Designing is an important and vital stage in the product’s lifetime, an analysis of the environmental impact and the durability of the product is done, so an analysis is made using the SolidWorks-CAD software. The object of the analysis is a toothed wheel, part of the mechanical bimetal temperature compensator. The case study presents a sustainability report showing a decrease in manufacturing cost, an improvement in the materials used, and a lower impact on the environment.
Developing a real-time accuracy monitoring system for industrial robot arms based on lean principles
Authors: Molnár Zs , Cascio G E , Husi G , Szűcs E G
Published: September 2019

In the Robot Laboratory of Mechatronics Department during practical classes of robot programming, the participants observed that the KUKA KR5 Arc robot arm’s practicing tool does not accurately follow the programmed path in every case. In accordance to Lean approaches, the observations of the participants were taken into consideration and the possible sources of error were identified. One of them is the robot arm itself, which is responsible for the execution of the programmed movements. The goal of this research is to develop a system which makes it possible to exclude the robot arm as a potential source of error from the error analysis. For this purpose, a monitoring system was developed which supports the Lean production by implementing one of the main pillars of the Toyota Production System. Jidoka is one of the main pillars, which means that the production process is automatically stopped if an error condition arises. The method was first implemented by Sakichi Toyoda in 1896, who developed a simple device for automatic looms, which stopped the machine if the thread broke. Using this principle, the autonomation – automation with human touch – of the robot arm is achieved.
Analysis of tribological damages of plain bearings
Authors: Sovilj-Nikić S , Sovilj B , Varga G , Antunović R , Ungureanu N
Published: September 2019

Tribological processes and failure of plain bearings significantly affect the availability, adaptability, reliability and productivity of modern technology, maintenance costs, energy costs and the costs of modern production. The research of tribological processes and failure of plain bearings should indicate the possible causes and the necessary measures to be applied in order to reduce the tribological processes and failure of plain bearings. In this paper, possible causes of tribological processes and failure of plain bearings were analyzed. Having in mind the most important causes of tribological processes and failure, a proposal for monitoring the condition is given.
Pedestrian visibility at night: the influence of the pedestrian clothing and the defective headlamp of the car
Authors: Benea B C , Trusca D D , Toganel G R , Radu A I
Published: September 2019

Low night vision is a factor contributing to the production of traffic accidents. In this work, we investigated the distance from which pedestrians can be seen by night, by a driver driving a car with a single functional headlamp. Six pedestrian clothing conditions were tested (black, blue, red, green, yellow and reflective vest). Pedestrians wearing dark clothing (black, blue) were only visible from a distance of 10 meters; the best visibility was for the pedestrian that wearing the reflective vest. The results demonstrate the importance of pedestrian clothing during night time on visibility while traveling on the public road.
Dynamic Analysis of a Human Ankle Joint Prosthesis
Authors: Copilusi C , Dumitru N , Margine A , Geonea I
Published: September 2019

This research addresses a human ankle joint prosthesis design based on a cam mechanism. Thus, a dynamic analysis of the entire human lower limb was performed in order to obtain the input data for numerical simulations of an ankle joint prosthesis. For this, experimental analysis was accomplished in order to obtain input and reference data for human ankle joint motion laws. These human ankle joint motion laws were considered from a healthy human subject and an amputee. A virtual model of the ankle joint prosthesis was designed with the aid of CATIA software and the working principle was based on a cam mechanism. This virtual model was simulated in dynamic conditions, similar to the imposed ones onto a mathematical model. Results represented through stress and deformations will validate the proposed ankle prosthesis prototype. Finally the proposed prosthesis prototype was manufactured and experimentally tested on the proposed amputee through a comparative analysis for validation.
A neural networks approach of process fault diagnosis using time series collected data through oil condition monitoring
Authors: Grebenişan G , Salem N , Bogdan S , Negrău D C
Published: September 2019

In this paper was used the data set collected in a research project between private companies from Romania and Italy, for the development of a basic approach of artificial neural network techniques, as an application in Matlab, aiming to detect the degree of degradation of oil, an automated installation, measuring online the physicochemical properties of the oil. Physical-chemical parameters measured lead to the creation of generous time series, but accessible by numerical and statistical calculation, for the application of artificial intelligence techniques. Applying neural network techniques to parameters that measure oil degradation, oxidation and humidity have generated the results of this work. The main function of monitoring the state of operation of a mechanical system, machine, or plant is to provide the almost correct diagnosis of the machine’s state and rate of change so that preventive measures can be taken at a given time.
Designing and realization an ECG based the Arduino Mega 2560 development board
Authors: Tătaru A I , Drugă C N
Published: September 2019

The paper presents several aspects concerning the design and construction of an ECG using an Arduino Mega 2560 development board and a click ECG module. In the first part of the paper are presented some notions regarding electrocardiography. Electrocardiography is used to diagnose cardiovascular disease and monitor heart health. This type of test is easy to use because electrodes are placed in certain regions on the chest, arms, and legs that are connected by wires to an ECG device. The second part of the paper presents the main components of the device: the Arduino platform, the ECG cables, the ECG click module, the Arduino Mega Click Shield, the WI-FI module and the ECG simulator. The recording system can be on thermosensitive paper, ink, cathode ray tube TFT, and LCD. The last part of the paper is dedicated to testing the device and explaining the way how to do a test.
Basic effects types of logistic infrastructural investments - theoretical approach
Authors: Dembińska I , Marzantowicz Ł
Published: September 2019

The study aims to determine the basic effects catalog of logistic infrastructural investments. The catalog proposes eight criteria for the division: the way the effects are impacted, the measurability of effects, the range of impact effects, the distribution of effects in time, types of effects, effects impacts, channels of impact effects and sustainability impacts. Each criterion was characterized. The result is a catalog of epistemological and pragmatic meaning.
Challenges of digitalization process in different industries. Before and after
Authors: Vartolomei V C , Avasilcai S
Published: September 2019

Since the appearance of the internet and new technologies, the business and socioeconomic sphere has taken a 360º turn. This gives us the opportunity to generate new business models, improve the analytical and predictive capacity both internally or externally and improve the company’s processes in terms of efficiency and effectiveness. The digitalization of processes implies adapting to the new technological environment and represents an added advantage for all companies regardless of the sector they are engaged in or the projects they carry out. In this way, we investigate the challenges and needs of companies from different industries before and after the implementation of the digitalization process, which is defined as being a part of the Industry 4.0, also referred to as the Internet of Things (IoT). Also, this paper describes the benefits of a digitalized company and the impact of cybersecurity in the results along with the definitions of threats which can occur and the type of strategy which shall be adopted in order to avoid security risks.
Strategic Communication Process: Support for Performance Measurement and Popularization of SMEs Innovations – I
Authors: Hulubei (Georgescu) A , Avasilcăi S
Published: September 2019

To perform and be relevant, SMEs must continuously innovate, be in constant contact with the market, and communicate their news strategically. Entrepreneurs need to go through strategic management system training and organization development processes, understand the importance of internal and external communication processes, invest in technology and automated processes, optimize their innovation, consistently train their employees, develop new product and service flows on the market and keep constant contact with the stakeholders. This paper analyzes, in theory, the advantages of the strategic communication process, highlighting the Balanced Scorecard multidimensional analysis model and the impact of innovation in SMEs at all levels. Through this model, the company can predict and analyze the qualitative and quantitative factors needed in the process of innovation and strategic communication, becoming part of an ecosystem that can generate change and improve the standard of living. Through this process, the company becomes part of an ecosystem that helps the economy develops and innovates.
Comparison of heating system alternatives for a rural house employing analytic hierarchy process
Authors: Cristea C , Cristea M , Tirnovan R
Published: September 2019

In this study were analyzed different heating systems to select the most appropriate type for a rural house. The performances of each alternative have been evaluated and compared using the analytic hierarchy process (AHP), a well-known and widely used multi-criteria method. There were considered five heating options: wood boiler, electric boiler, gas boiler, pellet boiler, and electric heating carpet, which were combined with two different heating terminals: radiant floor heating and the classic radiator. The alternatives were analyzed based on several criteria, which were defined considering economic, environmental, and social aspects. After the variants were ranked, and the most appropriate solution was determined, a sensitivity analysis was performed. The results indicated that the final ranking of the alternatives is robust, with slight variances, depending on the percentage with which the criteria weights were varied.
Design of a device for testing and analyzing the friction coefficient during metal cutting
Authors: Tamaşag I , Amarandei D , Beşliu I
Published: September 2019

This paper seeks to illustrate the development of a device for tribotesting and analysing of friction and normal forces in orthogonal cutting. In order to investigate the friction and normal forces, the objective of the device will be focused on the analyzing of the behavior of the tool-chip (rake surface) or tool-workpiece interface (flank surface) under dry metal cutting conditions. The device will simulate an orthogonal cutting process conditions that can be afterward modified for another cutting process basically with different geometries. The testing setup allows the friction coefficient to be estimated using the well-known Coulomb’s friction law. Experimental procedures were conducted to validate the new device. The experiments were carried out using a tungsten carbide P20 as insert and C45 as the workpiece material, and the results showed that the coefficient of friction is dependent on the area of contact between the tool and workpiece.
Research on designing a manufacturing cell for the Disk Limiter
Authors: Indre C I , Blaga F S , Miculaş C
Published: September 2019

The paper presents the results of the experimental researches carried out in order to increase the productivity of the processing process for part of the automotive industry. Thus, by increasing the volume of parts ordered by the recipient, research has been done to make a manufacturing cell having the ability to obtain a competitive unitary time. Manufacturing cells that are equipped with one or more industrial robots, machine tools with numerical control and auxiliary components (conveyors, equipment, etc.) have a rather old concept that has evolved and has reached a high level today. The machines integration in a flexible manufacturing cell is the way of making profitable the use of machines with numeric control. If they exist alone, the human users, that works on the cell, would be forced to make manually the download of machining programs, and to take decisions themselves, in real time. These decisions are related with the complex resources management, as machining time, machining tools and raw material.
The method of identity verification when signing electronic documents based on biometric means of identification
Authors: Pysarenko V , Dorohan-Pysarenko L , Kantsedal N
Published: September 2019

The development of global communications in business and everyday life has led to the emergence of a new plane of relationship, the subject of which is the electronic data exchange. In this exchange of data involved bodies of state power, local self-government, public administration, commercial and non-profit organizations, as well as citizens in their official and personal relationships. The problem of protecting electronic documents with the help of electronic-digital signature is extremely widespread in our time. As the era of the Internet and electronic technologies has come to an end, problems with the security of electronic document circulation, including those in public administration, are beginning to emerge. The issue of the preservation of electronic documents from copying and forging requires for its solution specific means and methods of protection. One of the means of such protection is a biometric digital signature, which undoubtedly confirms the authenticity of the information in the document, its details and the fact of signature by a particular person. The technology of electronic document circulation with the use of biometric digital signature in the public administration is not implemented today, which significantly reduces its quality and the development of electronic document circulation in general. The development is devoted to the possibilities of use and benefits of the introduction of electronic document circulation using the method of identity verification when signing electronic documents based on biometric identification tools.
Comparative research results of CFR Octane Rating Unit Engine and Dacia Single Cylinder SI Engine equipped with classical Spark Plug and LASER Ignition
Authors: Done B G , Copae I
Published: September 2019

Nowadays, research has developed new technologies for a better control of the combustion process. Among the new technologies used for Ignition and combustion control, the LASER spark plug system is defined as an innovative technology which could overcome several limitations of classical spark plug. The purpose of the paper is the experimental research of the LASER spark plug used in the spark ignition(SI) engine. Improved performance, ensuring rapid and robust combustion, depends on how the Ignition stage is achieved. An Ignition system that could provide such an enhanced combustion process is the one based on plasma generation using a Q switched solid state LASER that delivers pulses with high MW peak power. The LI device used in the current research was a LASER medium Nd:YAG/Cr4+:YAG ceramic structure (Baikowski Co., Japan) that consisted of a 8.0-mm long, 1.0-at.% Nd:YAG ceramic, optically-bonded to a Cr4+:YAG ceramic with saturable absorption. It was designed, integrated and built to resemble a classical Spark Plug and could be mounted directly on the cylinder of a CFR Octane Rating Unit Engine as well as on a Dacia Single Cylinder SI Engine which led to several results among which: indicated, mediated pressures and their wave dispersion.
Analyzing the sustainability of an automotive component using SolidWorks CAD software
Authors: Torcătoru C , Săvescu D
Published: September 2019

Design stages have been widely recognized as a milestone in the life cycle of a product in sustainability implementation, and this is of major importance for leading organizations that produce cost-effective and environmentally friendly products. This paper focuses on analyzing some aspects of environmental impact and ecological sustainability of design models using SolidWorks CAD design software. The material from which the piece was made was evaluated, with emphasis on its strength, durability and environmental pollution in terms of carbon footprint, energy consumption, air acidification, and eutrophication. Consideration was given to the whole life cycle of the product under consideration, from raw material extraction, processing, product production, assembling and use to the end of life, taking into account the mode of transport and the distance between these stages. In the case study is presented the virtual model of the analyzed product and the sustainability report that the SolidWorks software provides us and which can be analyzed later by the whole organization for the adoption of the right decision.