bluuebunny/crossref_metadata_2025 huggingface dataset:
METHODOLOGY FOR ENERGY-EFFICIENCY INVESTIGATION OF ELECTRICAL CONSUMERS
Authors: KONDYU ANDONOV , OGNYAN DINOLOV , LIUDMIL MIHAILOV
Published: October 2018

Uniform indications for electric consumers classifying are determined according to their technological signs and the physical forms of electrical energy conversion. Levels of consumption in electrical consumers are defined, on the basis of which 29 indexes for investigation, evaluation and comparison of the energy efficiency in electric drives are systematized. The indexes are distributed into 6 groups. Dependencies are defined and methods are developed for determination of the indexes system. An aggregate mathematical model for monitoring and evaluating the energy efficiency of grouped electric drives is synthesized. Case-study results for a typical belt-conveyor system in a thermo-electric power plant are obtained.
DETERMINING THE WORKSPACE SHAPE OF A ROBOT WITH DELTA 3D OF PARALLEL STRUCTURE
Authors: DRAGOS ANDRIOAIA , MARIUS PASCU , LUCIAN MIHAILA , MARIAN FUNARU
Published: October 2018

During the latest years, the robots that include mechanisms with Delta 3DOF parallel structure attracted the attention of the university research centers due to their unexploited potential. Besides the advantages given by the Delta 3DOF parallel structure, there is a series of disadvantages too. A significant disadvantage is the fact that the workspace is limited. Under these conditions, the studies on determining and improving the workspace got intensified lately. This work is presenting a study on determining the workspace of a parallel structure Delta 3DOF, by using a method that digitizes the angular position parameters of the active kinematical couplings.
MODELING THE ENERGY EFFICIENCY OF MECHANICAL HANDLING MACHINES AND SYSTEMS
Authors: OGNYAN DINOLOV
Published: October 2018

The aim of this study is to justify a generalized basis model for investigating, evaluating and comparing the energy efficiency of the individual and the grouped mechanical handling machines and systems. Based on a conducted analysis and developed model technological schemes of the systems for continuous transport, dependencies are drawn for determining the basis power and minimizing the potential energy losses in loads passages, the losses of height and potential energy in the systems’ auxiliary elements as well as the total energy losses. Additional indices for basis evaluation of the energy efficiency of the continuous-transport-systems technological schemes, regardless of the systems’ type and scope, are developed and systematized.
CONSIDERATIONS ON THE STRESSES CONCENTRATION FACTOR
Authors: MARCU FRATILA
Published: October 2018

The paper analyzes stresses in an area of tension-type with geometric discontinuity concentrator. The geometric discontinuity is a hole located in a thin plate of finite dimension. The stresses and their variations were determined using the finite element method (FEM). Stresses values obtained with FEM, were used as basic data on the method of least squares to determine an analytical relationship, for calculating the coefficient of stress concentration. Relationship obtained by this method of calculation is compared with those in the technical literature.
AUTOMATIC PALLET CHANGER MECHANISM USED ON MACHINING CENTRES
Authors: MIHAILA LUCIAN , STAN GHEORGHE , FUNARU MARIAN , OBREJA CLAUDIU , ANDRIOAIA DRAGOS
Published: October 2018

In order to shorten the auxiliary times regarding tool and workpiece changing, conventional machine tools are equipped with automatic tool changers and automatic pallet changers, thus becoming machining centers. Reducing the time consumed with the change of the workpiece to follow in machining implies the existence of another table – i.e. the pallet – on which the workpiece is positioned and clamped, while on the working area of the machine another part is manufactured. This paper is presenting a new automatic pallet changer mechanism which is hydraulically driven, along with its guiding and transmission systems.
THE FLUID FLOW SIMULATION THROUGH TO A VENTURI NOZZLE
Authors: OLARU IONEL
Published: October 2018

In this work it was performed a fluid flow study of cooling systems for metal cutting. The study of forces resulting from the impact of fluid jets and when fluids are diverted round through the nozzle involves the application of pressure forces. The forces are determined by calculating the change of momentum of the flowing fluids. It was performed a simulation of the flow through a nozzle commonly used for pressure cooling of the cutting zone.
USING GENETIC ALGORITHMS FOR OPTIMIZATION OF TURNING MACHINING PROCESS
Authors: PETKOVIC DUSAN , RADOVANOVIC MIROSLAV
Published: October 2018

Optimization methods of machining processes are tools for improving product quality and reducing cost and production time. Modern optimization methods, among which genetic algorithms (GA) have been, used a lot during last two decades. This paper describes the optimization of machining processes by using genetic algorithms. Optimal parameters of machining (cutting speed and feed) were determined. Also, minimal cost for the turning process was achieved.
COMBUSTION TECHNOLOGIES WITH LOW POLLUTING EMISSIONS LEVEL – LOW SWIRL COMBUSTION
Authors: STĂNILĂ MARIUS-ION , NEDEFF VALENTIN
Published: October 2018

The paper presents the most important aspects regarding the low swirl combustion system (LSC), the design of the low swirl burner (LSB), the development and technological transfer stages from the lab-testing burner to the burners used in the high power gas turbines. The development of this low swirl combustion technology was required by the bigger and bigger constraints on the burning equipments that use fossil fuels, regarding the reduction of pollutant emissions. The low swirl combustion technology is an easy and cheap way to ensure the efficient combustion of the fossil fuels with a low level of pollutant emissions.
TRENDS REGARDING THE DEVELOPMENT OF HIGH THERMIC EFFICIENCY AND LOW LEVEL OF POLLUTING EMISSIONS COMBUSTION SYSTEMS
Authors: STĂNILĂ MARIUS-ION , NEDEFF VALENTIN
Published: October 2018

Flameless combustion, or moderate or intense low oxygen dilution combustion, is an advanced technology that meets all the conditions for being an important actor in the researchers’ efforts to develop low level of polluting emissions and high thermic efficiency combustion systems. Because all the factors that contribute to the emerge of this kind of combustion are not completely understood, there is the suspicion that this type of combustion could be achieved only by overheating the combustion air, which generates the limitation of this technology’s application area. After all the last years conducted research, it came to the conclusion that the requirements for this combustion are less severe than they were believed to be. The recent research is conducted towards the use of this type of combustion for all type of fuels, gas, liquid and solid.
EFFECT OF ULTRASONIC TREATMENT AND ALUMINIUM SULPHATE ON CHEMICAL WATER INDICATORS
Authors: STEFAN ANCA , BURTEA MARIANA CARMEN
Published: October 2018

The raw water treatment using coagulant and ultrasound indicates a faster decrease of turbidity. The main water indicators - pH dynamics and dissolved oxygen content are also presented and discussed. The dose of aluminum sulphate, actually the most widely used coagulant, decreases 8 times at the use of ultrasound waves, which represents an economy of chemicals for the water plants.
PERFORMANCE EVALUATION OF DIESEL ENGINE WITH SAFFLOWER OIL
Authors: KUMARI A. SWARNA , PENCHALAYYA CH. , RAJU A.V. SITA RAMA
Published: October 2018

The vegetable oils and their blends have come across the world as alternative fuel in place of fossil fuels. This paper presents the results of experimentation carried out on a diesel engine with different blends of safflower oil with diesel fuel. Engine tests have been carried out to obtain comparison of fuel consumption, specific fuel consumption, brake thermal efficiency, volumetric efficiency and smoke opacity and compared with that of diesel fuel. From the experimental investigation, the safflower diesel blends show better performance and lower smoke when compared to diesel. With blend B20 the thermal efficiency is increased by 5.2%.
HYDRODINAMIC STUDY OF CLAY PARTICLES IN FLUIDIZED BED
Authors: MUNTIANU GABRIELA , PLATON NICOLETA , ARUS VASILICA ALISA , ROSU ANA MARIA , NISTOR DENISA ILEANA , JINESCU GHEORGHITA
Published: October 2018

The aim of the present study was to establish the optimal operating dynamic parameters in fluidized bed for the sodium clay particles and pillared clay particles. In order to determine the influence of the clay particles on the structure of the fluidized bed, the conditions in which the incipient fluidization appears were determined depending on the: nature, diameter and density of the material, gas velocity and fixed bed height. Experimentally the minimum fluidization velocity, the minimum pressure drop and bed porosity were determined. Correlation relations were established in order to approximate the minimal error for the experimental results.
A METHOD FOR EVALUATING THERMAL TRANSFER THROUGH CONVECTION AND CONDUCTION IN LAYERED COMPOSITES
Authors: IATAN RADU , ENĂCHESCU GEORGIANA LUMINIŢA , IAŞNICU (STAMATE) IULIANA , POPA CARMEN T.
Published: October 2018

This paper presents the mathematical expressions for calculating the temperatures between the layers of a plan, tubular or spherical composite, by natural or forced conduction and convection or under the influence of stationary heat flow. Here there are taken into account two possibilities of contact between the layers: one is the perfect contact or the other acknowledges the existence of casual imperfections. The expressions also take into consideration the influence of added protection on the wall surface or the possible deposits of solids materials that can occur during the operation of the structure.
RESULTS FROM THE APPLICATION OF A MODEL FOR ENERGY-EFFICIENCY INVESTIGATION OF MECHANICAL HANDLING MACHINES AND SYSTEMS (PART 1)
Authors: OGNYAN DINOLOV , BORYANA MANOLOVA , MIHAILOV LIUDMIL , ANDONOV KONDYU
Published: October 2018

The aim of this research is to ascertain the functionality and practical applicability of a developed generalized model for investigation of the energy efficiency of mechanical handling machines and systems in its specific application for the continuous-transport individual machines and systems. A typical industrial system for transportation and fragmentation of rock materials is chosen as an investigation object. The investigation procedure is entirely based on the model being validated. The obtained results demonstrate the presence of possibilities for practical application of the model and reveal a low energy-efficiency level. If the belt conveyors’ load is optimal, the electric energy consumption of the site can be decreased by 45 % as the potential energy losses can be reduced to 0.66 % in case of reconstruction.
TREATMENT OF DOMESTIC WATER USING CERAMIC FILTER FROM NATURAL CLAY AND FLY-ASH
Authors: SUBRIYER NASIR
Published: October 2018

The declining water quality in Sriwijaya University has been caused by the presence of heavy metal contents such as Iron (Fe) and Zinc (Zn) in the treatment and distribution of water. A simple method is proposed in this work to minimize the heavy metal content in water by using filtration technology. This research was carried out using ceramic filter made of 77.5% natural clay, 20% fly ash, and 2.5% iron powder. The results showed an increase in the quality of raw water that is in accordance with the requirement of drinking water standard. The rejection percentage of TDS, Iron (Fe) and Zinc (Zn) content in feed water tended to be high and met the regulation number 492/MENKES/PER/IV/2010 for standards of drinking water in Indonesia.
CHEMICALLY MODIFIED CLAYS USED FOR ENVIRONMENTAL QUALITY
Authors: PLATON NICOLETA , ROŞU ANA-MARIA , ARUŞ VASILICA ALISA , NISTOR DENISA ILEANA , SIMINICEANU ILIE
Published: October 2018

In this work, catalysts were synthesized based on chemically modified clays through pillaring process with Al (III) and Fe (III) using commercial bentonite and acid-treated montomorillonite like KSF montmorillonite and K10 montmorillonite from Aldrich, as raw materials. The raw materials and chemically modified clays were characterized by: BET (Brunauer-Emmet-Teller) method and XRD (X-ray diffraction). Afterwards these catalysts were tested during wet oxidation with peroxides using phenol as target compound. Experimental results show that chemically modified clays with Fe(III) presented a higher catalytic activity in Fenton like processes than Al-Fe clays.
SIMULATING PASSIVE SUSPENSION ON AN UNEVEN TRACK SURFACE
Authors: ANDRONIC FLORIN , MIHAI IOAN , MANOLACHE-RUSU IOAN-COZMIN , PĂTULEANU LILIANA , RADION IVAN
Published: October 2018

Automobile suspension systems have an important role in a vehicle's functioning, especially with regard to driving safety. In the present paper we exhibit the equations that characterize a passive suspension system. Considering that solving the equations is extremely cumbersome we developed a simulation scheme in MATLAB Simulink. The simulation allows for an analysis of the behavior of the passive suspension system on any uneven track surface whose configuration is ensured by stimulus signals. For the simulation we used the quarter car model. The suspension was chosen as having two degrees of freedom. 
A STATISTICAL APPROACH TO CLASSIFY AGRICULTURAL SATELLITE IMAGES USING TEXTURAL FEATURES EXTRACTION
Authors: VAKILIAN KEYVAN ASEFPOUR , ABOUNAJMI MOHAMMAD , MASSAH JAFAR
Published: October 2018

Increasing the resolution of recent satellite images has become one of the problems for image classification in scientific studies. One way to overcome this problem is to characterize the pixel being classified by parameters measuring the spatial organization of the pixels in its neighborhood. In this study, textural parameters of one-step and two-step encoded images were calculated in the form of a vector. These parameters were subject to the support vector machine classifier to decide which class image is belonging to. Results showed that the encoding method is a proper way to compress an image without losing textural information. It reduces the size of data and thereby reducing the computation time characteristics.
EXPERIMENTAL STUDY REGARDING MECHANICAL PROPERTIES OF FeP-05-MB SHEET STEELS SUBMITED TO COROSIVE MEDIUMS
Authors: ROŞU ANA-MARIA , PLATON NICOLETA , ARUŞ VASILICA ALISA , MIRON NECULAI DORU , NISTOR ILEANA DENISA , BRABIE GHEORGHE
Published: October 2018

Corrosive medium is a little known phenomenon and it is necessary to emphasize that corrosion is a secondary epiphenomenon in the development of bacteria and their metabolism, or that the occurrence and development of bacteria are accidents at the surface of the corroded parts. The purpose of this research is to determine the mechanical properties of a sheet steel (type FeP-05-MB) submitted to corrosive mediums. These mediums are: ambient, saline and microbiological. After the action of these mediums, the metallic samples were analyzed in order to observe the resistance at corrosion after their corrosion by different mediums.
EXPERIMENTAL ANALYSIS OF THE INFLUENCE OF BALLSCREW STIFFNESS ON THE POSITIONING PRECISION OF KINEMATIC FEED CHAINS USED ON CNC MACHINE TOOLS
Authors: FUNARU MARIAN , STAN GHEORGHE
Published: October 2018

Recent trends in the machine tools domain have focused on improving the manufacturing performances by increasing the feed rates and acceleration values. In this context, the stiffness of the constructive elements which form the mechanical part of the kinematic feed chains need to be studied in order to determine the machine tool dynamic behavior. This study plays a very important role in the correct dimensioning of the feed chain structure and in establishing an optimum control law for the closed-loop system. The present paper presents an experimental study which demonstrates the influence of the whole kinematic feed chain stiffness on the positioning precision of the moving table. Experimental tests were carried out on a test bed which uses the indirect position measuring system, in which case all the external disturbances affecting the mechanical part are found in the values of the positioning precision parameters.
IDENTIFICATION OF THE MAIN PHYSICO-CHEMICAL PROPERTIES INFLUENCING THE QUALITY OF THYME (SATUREJA HORTENSIS)
Authors: CONSTANTIN SIMONA GHINITA , PRAISLER MIRELA , IORDĂCHESCU GABRIELA
Published: October 2018

Thyme (Satureja hortensis) is a popular spice for food, which is also often used as a medicine for various ailments. This paper presents an artificial intelligence method applied for the objective determination of the most important physico-chemical variables affecting the quality of thyme, i.e. Principal Component Analysis (PCA). The results show that the main properties which significantly influence the nutritional value of thyme are moisture (MOIST), dry matter content (DRYM), protein content (PROT) and, to a lesser extent, carbohydrate content (CARB). Humidity is strongly and negatively correlated with the latter three variables. The main variable that ensures the similarity between the thyme samples having the same geographical origin is the monosodium glutamate content, which generates its delicious (umami) taste.
FREON COOLING MINISYSTEM USING CIRCULAR MICRO-CHANNELS
Authors: PĂTULEANU LILIANA , MANOLACHE-RUSU IOAN-COZMIN , BURDAN TIBERIU , ANDRONIC FLORIN , RADION IVAN
Published: October 2018

The necessity of a higher data processing speed was crucial for the advances in computer science. There were created processors that needed increasingly more power, so that new methods were discovered and more complex systems were created in order to solve the cooling issue. In this paper, there are presented the trials performed on a mini refrigeration plant that used mechanical compression of Freon’s, designed to cool electronic components like microprocessors, microcontrollers, graphic stations, or in the case of local cooling in diverse areas such as bioengineering, optics and nanotechnologies. The refrigeration system was constructed as an experimental set-up and consists of the following: two mini heat exchangers, working both as a condenser and a vaporizer, which are made of circular micro channels, a refrigeration compressor, lamination valve which contains a circular nano channel and a micro filter. The experimental determinations have proven that, although such a system contains a small quantity of Freon, of the order of milligrams, it reaches temperatures of -44 °C.
MODELLING AND SIMULATION OF SEPARATION OF COWPEA AND IMPURITIES IN A PNEUMATIC CLEANER WITH COUNTER-FEED
Authors: ADERINLEWO ADEWOLE A. , RAJI ABDULGANIYU O.
Published: October 2018

Mathematical models were developed to study the displacements of cowpea and impurities particles and to predict cleaning efficiencies during separation in a vertical pneumatic cleaner. The predicted horizontal displacements were plotted against the vertical displacements at different angles of injection and air velocities. The plots showed that at a particular air velocity the amount of impurities that are removed from cowpea increased as the angle of injection increased. Experimental studies also confirm that cleaning efficiencies increased as the angle of injection increased at a particular air velocity. There was a high correlation between the predicted and experimental cleaning efficiency.
NEW PORTFOLIO RISK OPTIMISATION METHOD FOR STRONGLY DEPENDENT ASSETS
Authors: FRYDRYCH PIOTR , SZEWCZYK ROMAN
Published: October 2018

New market time series Multiplexed Hysteretic Threshold Autoregressive (MHTAR) model was developed to test the correlation between assets stability, which is the basis of MPT theory and other portfolio optimisation methods. New approach to risk optimisation was presented, which can efficiently lower risk for strongly dependent assets. Developed Random Trading Signals Multiplexing (RTSM) method enables diversification of risk for any portfolio and increase safety for assets with low liquidity.
PREDICTION OF WEAR AND FRICTION COEFFICIENT OF BRAKE PADS DEVELOPED FROM PALM KERNEL FIBRES USING ARTIFICIAL NEURAL NETWORK
Authors: KUNCY IKPAMBESE KUMADEN , ABUGH ASHWE , TYOVENDA TULEUN LIVINUS
Published: October 2018

Artificial neural network prediction of wear rate and friction coefficient of brake pads developed from palm kernel fibres (PKF) was carried out in this study. Major input parameters including materials formulation, manufacturing conditions, and operating conditions were introduced into the neural model while wear rate and friction coefficient were the outputs. The network architecture of LM12 [4-3]2 2 was selected for predicting the wear rate and coefficient of friction. The predicted wear rate and friction coefficient using ANN models were compared with the measured values using some statistical indicators. Results showed that the ANN predicted accurately the wear rate and friction coefficient of the developed automotive brake pads.
ASSESSMENT OF SOME PHYSICAL FACTORS AND DESIGN FEATURES OF ROTORS IN THERMAL EFFECTS CAUSED BY CENTRIFUGATION
Authors: MAFTULEAC ALEXEI
Published: October 2018

In separating the components of highly dispersed heterogeneous systems, use is made of centrifuges with very high rotation velocities, this leading to samples heating. The said above is due to the friction of the rotor against the air from the centrifuge chamber to the movement of heating from centrifuge engine towards the samples and to compression of samples liquid. However, heating of samples sensible to temperature can generate in these samples the intensification of some uncontrolled chemical processes. This paper is devoted to the investigation of the increase of centrifuged samples temperature depending on the time and relative centrifugal acceleration for model-samples (water and glycerine) using two constructively different types of rotors. The obtained results can be taken into account when elaborating some more rigorous methods for studying finely-dispersed heterogeneous systems.
POSSIBILITIES FOR THE TREATMENT OF WASTEWATER FROM PRIMARY PETROLEUM CLARIFIERS
Authors: PANAITESCU CASEN , PETRESCU MARIUS GABRIEL , BUCUROIU RODICA
Published: October 2018

Wastewater from the oil industry treatment is very difficult to achieve in an uniform matter. Therefore, pre-treatment steps are often required in order to reduce the compounds’ elimination and to determine which treatment cannot be eliminated in the biological stage. Application of a pre-treatment process eliminates certain compounds with specific microorganisms that do not fit with the activated sludge. In this paper, the details of this solution were studied. It was established a reduction of the benzene concentration from 82.23 mg/L to 18.04 mg/L, toluene 3.08 mg/L to 1.15 mg/L, xylene at 4.1 mg/L to 3.1 mg/L and naphthalene 7.08 mg/L to 4.96 mg/L. Experiments have shown a decrease of the polycyclic aromatic hydrocarbons concentration below the limit of detection of the device.
ASPECTS REGARDING VALORIFICATION OF NATURAL FIBROUS MATERIALS FROM TEXTILE AND LEATHER INDUSTRY FOR COMPOSITE MATERIALS
Authors: POPA NATALIA , TIMOFTE DAMIAN , VOICU GHEORGHE , DURBACA ION , TOMA MAGDALENA–LAURA
Published: October 2018

Technological aspects regarding sustainable development concept and considerations on creating textile products with high added value from recycled fibres as combed and carded yarns, woven fabric waste, hosiery and leather waste. The paper offers some ways to reuse wastes from leather industry and presents some physical characteristics of some composite materials based on PVC mixed with different concentrations of leather wastes, before and after forced ageing.
RISK MANAGEMENT METHODOLOGY OF INVESTMENT PROJECTS WITH ENVIRONMENTAL IMPACT
Authors: GINDU ELENA , CHIRAN AUREL , DROBOTĂ BENEDICTA , JITĂREANU ANDY-FELIX
Published: October 2018

In projects, a strategic component is to identify all risks that might influence their success, prevent and manage them effectively. Risk management is essential to add value to an investment and improve results. With the economic and financial crisis in recent years, increasingly, more companies have realized the importance of using a system of risk management, given the multitude of variables that can influence the success of a project. These include: legislative changes, global political and economic instability, natural disasters, climate change, human resources, liquidity risk, environmental impact, risk of erroneous calculation of total project costs, risk of failure into initial project schedule, prolongation risk, the risk of failure of internal rate of return (IRR) and net present value (NPV) etc. The study proposes a new method of risk assessment and management in the investments projects with environmental impact and its application in a case study. The method will take into consideration besides the economic and financial indicators, hard to be understood by smaller investors, a set of simple and important questions that they have to analyze before deciding to start an investment project. The new methodology will have a comprehensive approach from identifying the investment opportunity, writing investment project until its implementation. This will take into account macroeconomic variables and the microeconomic environment that can influence the success of project implementation. The main advantage of applying the new methodology are: knowing all the variables that influence the success of a project realization; awareness of the importance of applying an effective risks management related to investment projects with environmental impact, increasing the quality and success of projects.
CALCULATION OF SOME THERMODYNAMIC PROPERTIES OF WATER FOR THE BOUNDARY POINTS BETWEEN REGIONS 3 AND 4 OF INDUSTRIAL FORMULATION IAPWS-IF97
Authors: POURSHAGHAGHY ALIREZA
Published: October 2018

In the calculations relating to the thermodynamic cycle of steam power plants, the enthalpy and the entropy of saturated liquid and saturated steam ( , , , and ) are needed. If one uses industrial formulation IAPWS-IF97, these four parameters ( , , , and ) should be determined by cumbersome numerical computations when the saturated pressure has a value between 16.529 MPa and 22.064 MPa. In this work, easy programmable equations are provided to calculate , , , and in this range of saturated pressure.
CHARACTERIZATION OF RHEOLOGICAL PROPERTIES OF SEMISOLID MATERIALS USED AS THERMAL INTERFACES. PART II: EXPERIMENTAL TESTS
Authors: CIORNEI FLORINA-CARMEN , ALACI STELIAN
Published: October 2018

The paper presents the proposed experimental methodologies employed in testing thermal greases. The data obtained from static tests, shearing test and filament stretching tests are used in estimating the parameters required for theoretical modelling of the material. Newtonian, viscoelastic and viscoplastic models were considered in correlating the experimental results to theoretical models necessary in interpreting and planning the material behaviour.
STUDY CONCERNING THE MONITORING OF PARTICULATE MATTER PM2,5 AND PM10 IN THE LIBRARY OF “VASILE ALECSANDRI” UNIVERSITY OF BACAU
Authors: IRIMIA OANA , PANAINTE-LEHĂDUŞ MIRELA , NEDEFF VALENTIN , TOMOZEI CLAUDIA , ŢÎRŢOACĂ ALEXANDRA
Published: October 2018

Air pollution is a problem both for outdoor as well for indoor environment (working environment). The work environment is represented by ambient where the worker operates and includes the physical environment and on other part the social environment. This paper presents the results of measurements for particulate matter (PM2,5 and PM10) in a closed environment, respectively the library of “Vasile Alecsandri” University of Bacau. The measurement for particulate matter PM2,5 and PM10 in the library was performed in seven halls: two deposits for old books, two deposits for new books, newspaper deposit, reading room and computer room. After accomplishing the measurements, were established the points where the admissible limit values have been exceeded for particulate matter PM2,5 and PM10, according to law. Thus, it is observed that the permissible values were not exceeded for either PM2,5 and PM10 particulate matter in any sampling points.
ISSUES ON THE APPLICATION OF A QUALITY-RISK MANAGEMENT SYSTEM IN A HEALTHCARE SERVICES PROVIDER UNIT
Authors: CONSTANTIN MILITARU , LEONARDO VOINESCU
Published: October 2018

A medical service, as a public service, is composed of a provider represented by the medical staff and a framework that carries out their work. Therefore, a qualitative management of services must be taken into account, on the one hand by the quality of care itself, and on the other hand by how the resource material is managed throughout the services provided. Fortunately, quality and risk management systems concepts are becoming [1]more widely used in their speech, by the responsible with those services at European and national level. A quality medical service can be attained through a rigorous and effective management of the quality of medical care itself, and through increased quality of human resources and materials involved and ensuring health and reduce the risks of treatment/ care patients. The authors present in brief a model of risk assessments and risk classification in a medical unit.

 
INFLUENCE OF SCREENING BLOCK SUPPORTING WAY ON THE BEHAVIOUR OF A SOLID PARTICLE ON AN OSCILLATING SURFACE
Authors: EMILIAN MOŞNEGUŢU , VALENTIN NEDEFF , NARCIS BÂRSAN , ALEXANDRA-DANA CHIŢIMUŞ , DRAGOŞ RUSU
Published: October 2018

This article shows a study aiming to identify the influence carried out by the supporting way of the working surface in the case of plane oscillating screening device, over the behavior of a solid particle. In order to achieve this, a theoretical study has been conducted by using a simulation program, Working Model 2D, within which two ways of supporting the screening block have been conceived: the working surface supported by tie-rods, and the surface suspended on tie-rods. Following the simulation, a series of physical parameters has been determined: the trajectory followed by the solid particle; the circuit of the solid particle during its movement on the working surface; the acceleration of the solid particle and the reaction force occurred between the solid particle and the working surface. Following the analysis of resulting values it may be noted that the best way to support the working surface, as far as the efficiency of mechanical separation is concerned, according to width and thickness of the solid particle, is obtained in the case where the working surface is supported by tie-rods, since the running time of the working surface is the highest and it is 4.12 seconds, value generating the high average moving speed; the particle’s rotation angle is from -2 rad to +4.8 rad, having as a result the amplest possible rotation.
EVALUATION OF WATER POLLUTION STATUS IN BAHLUI RIVER (IASI TOWN AREA) DUE TO DOMESTIC AND URBAN WASTEWATER TREATMENT ACTIVITIES
Authors: CARMEN ZAHARIA
Published: October 2018

This study presents some data about the water pollution status of Bahlui river in Iasi town area (two control sections) mainly due to domestic and urban wastewater treatment activities, considering especially some quality indicators (i.e. nitrogen-based nutrients, total phosphorus and sum organics content) evaluated for 2009-2010. The Bahlui water classification by European standards in Iasi town area corresponds to ‘medium’ (WQI = 53.893 - 64.345). The real water pollution state of Bahlui river (Iasi town area) is estimated by the global pollution index (I*GP), and corresponds to values of 2.80-2.929 (Valea Lupului-Iasi control section), and 3.030-3.196 (Holboca control section, i.e. downstream of Dancu wastewater treatment plant). These values are indicating an aquatic environment modified by domestic and urban wastewater treatment activities, generating discomfort effects, or producing stress against aquatic life forms. These data are recommending application of hydro-ameliorative/remediation actions, and permanent control of Bahlui watercourse quality in all existing control sections.
EFFECTS OF GEOMETRIC PARAMETERS ON ENTROPY GENERATION IN FIRE-TUBE STEAM BOILER’S HEAT EXCHANGER
Authors: OLUMUYIWA LASODE , JOSEPH OYEKALE , IDEHAI OHIJEAGBON , JOHN OLADEJI
Published: October 2018

This paper presents a parametric study on fire-tube steam boilers’ heat exchanging unit using Entropy Generation Minimization (EGM) technique. Mathematical equation that models entropy generation rate (Ṡgen), and entropy generation number (Ns), were formulated. The entropy generation number was related to the geometric features of the system. Solving the equations showed the effects of each geometric feature on both pressure drop and Ns. Correlation equation relating dimensionless fire-tube length to dimensionless tube diameter was also obtained. The obtained correlation equation is a tool to be incorporated into fire-tube steam boiler design, so as to account for entropy generation during design.
THEORETICAL RESEARCH REGARDING THE RISK-FREE WORK OF THE GANTRY CRANES
Authors: GHEORGHE RADU , IOANA SONIA COMĂNESCU
Published: October 2018

The research bases on the observation that the check imposed by the National Authority I.S.C.I.R. regarding the cranes authorization is necessary but not enough for the assurance of their work safety. The current specific rules do not contain provisions concerning the vibratory state of the cranes. Practice shows that the beginning of a work which is outside the normal parameters (changes of the optimum technical state – risk of accidents occurrence), appear in their vibratory mark. The research has as main goal the increase of the work safety and the elimination of the risk of accidents.
EXPERIMENTAL STUDY CONCERNING THE DISTRIBUTION OF GRANULAR PARTICLE SHAPE FROM A FILTER LAYER
Authors: OANA IRIMIA , VALENTIN NEDEFF , MIRELA PANAINTE LEHĂDUŞ , CLAUDIA TOMOZEI
Published: October 2018

The shape of granular particle from a filter layer represent a determinant factor regarding the efficiency of filtration process. In order to adequately predict the efficiency of granular filters is necessary to know the distribution of granular particle shape from filter layer. This paper presents a small study - in terms of experimental results, but laborious - in terms of sample preparation, regarding the identification of distribution by shape classes of granular particles from a filter layer. For experimental determinations have been used perlite and anthracite - two granular filter materials. It has been analyzed in terms of particle shape 1,000 particles of perlite and 1,000 particles of anthracite taken randomly from each filter layer. It has been observed that spherical particles have an average distribution for two type filter materials. 
ANALYSIS OF PRESSURE LOSS COMPONENTS IN AN INDUSTRIAL EXTRACT DUCT SYSTEM
Authors: JOHN IRISOWENGIBIA SODIKI
Published: October 2018

The frictional head loss and the loss through fittings are computed for branch duct runs of an industrial extract ventilation system. Results show increases of both of the aforementioned loss components with increase in duct length. Furthermore, the fraction of the total loss due to fittings decreases from 0.60 to 0.45, with a corresponding increase of the fraction due to friction (from 0.40 to 0.55).Representative fractions of head loss components, obtained in the manner of this study, are shown to facilitate loss estimates and extract fan selection.
COMPARATIVE ANALYSIS OF THE OWN EXPERIMENTAL TECHNIQUES OF PRODUCING THE FOAMED GLASS-CERAMIC
Authors: PĂUNESCU LUCIAN , DRĂGOESCU MARIUS FLORIN , AXINTE SORIN MIRCEA
Published: October 2018

The paper presents experimental results obtained by a team of researchers from the company Daily Sourcing & Research SRL Bucharest in the field of producing the foamed glass-ceramic from waste bottle glass, coal ash and silicon carbide as foaming agent. The originality of the experiments consists in the use of electricity or microwave energy, unlike all techniques known worldwide consumers of fossil fuel. The product, obtained with low energy consumptions and very low pollutants emissions, has physical and mechanical characteristics of an insulating material, i.e. high porosity, low thermal conductivity and an adequate compressive strength
RESEARCH ON SINGLE-LEAF WALLS MADE WITH LIGHTENED CLAY BRICKS
Authors: JUÁREZ MANUEL C. , MORALES PILAR , MUÑOZ PEDRO , OLASOLO PABLO
Published: October 2018

This paper explains the studies conducted on the subject by RADEB (Research and Development in Energy and Buildings) Research Group at the University of La Rioja. The aim of this work is to study the possibility of improving the thermal transmittance of a single-leaf wall made with lightened clay bricks. A first aspect is to study the possibility of lightening the clay by using additives, reducing the clay’s conductivity without decreasing its resistive ability. The internal and external geometry of the bricks has been studied by the Finite Element Method (FEM). Different wall assemblies with these bricks have been studied.
PROPER TIME IN TECHNICAL SCIENCES AND ALTERNATIVE NOTIONS FOR THE FORCE, MECHANICAL WORK AND HEAT
Authors: MAFTULEAC ALEXEI
Published: October 2018

The notion of proper (localized) time is one of the more important in the theory of relativity and is often used to explain phenomena that occur in conditions of high speeds or gravitation. In this paper, on the basis of the concept of proper (localized) time we tried to explain the functioning of simple mechanisms as a change in their space/time relationships, and to consider from another point of view some notions of physics (mechanics). A hypothesis about space and time equivalence and their mutual compensating change in every phenomenon that occurs, has been proposed. This hypothesis is substantiated with formulas and data from literature. This article may be of interest to the physicists and engineers.
MICRO DETERMINATION OF DOPAMINE IN BIOLOGICAL SAMPLES BY COUPLING REACTION
Authors: AL-OGAIDI AHMED JASSIM MUKLIVE
Published: October 2018

The paper presents the development of an analytical method to determine dopamine by coupling reaction with diazotized solution of 4-Aminoantipyrine in basic media to give a compound with a single azo dye salt having orange color soluble in water.  A calibration curve for a range of concentration (9.14x10-5 – 2.28x10-3 μg.mL-1) was realized and the value of molar absortivity was 1.5x103 L.mol-1.cm-1, with a relative standard deviation more than 1.26% and a recovery 98.77%. As we study the nature of the azo dye by mole fraction method, from the practical value we found that the mole fraction of the dye compound is 1:1 (dopamine: 4- amino antipyrine) and the stability factor reach to 1.4x106 L.mol-1. The described procedure is very simple, low-time-consuming, provides high throughput of examined samples, and could be used for routine screening and confirmatory analyses as well. The method was successfully validated to the analysis of the dopamine in biological samples.
NEW MX2 AND M’Cl3 (M = Cu, Zn; M’= Y, Dy, Pr; X = Cl, Br) MALEATO COMPLEXES AND TETRAPHENYLANTIMONY FORMIATE ADDUCT: SYNTHESIS AND INFRARED STUDY
Authors: SEYE DAME , KHADIR DIOP BCHEIKH  ABDOUL , TOURE ASSANE , DIOP LIBASSE
Published: October 2018

Eleven complexes and adduct have been synthesized and studied by infrared. The suggested structures are discrete with tetrahedral, trigonal bipyramidal, square planar or octahedral environments around Zn, Ni, Hg and Cu centres – the coordination number is eight in the yttrium compound and ten in the dysprosium one-. The maleate anion behaves as a bidentate, a monochelating, a bichelating or a tetradentate ligand while the formiate anion behaves as a monodentate ligand. For compounds containing a protonated amine or a methanol molecule, when hydrogen bonds are considered a supramolecular architecture may be obtained.
Van İlinde Domatesin Yaygın Olarak Yetiştirildiği Alanların Toprak Özellikleri İle Domates Bitkisinin Beslenme Durumunun Belirlenmesi
Authors: BAYRAM Sezgin , GÜLSER Füsun
Published: October 2018

Bu çalışmada Van ilinde domatesin yaygın olarak yetiştirildiği Erciş,
Gevaş ve Edremit ilçelerinde domates bitkisinin beslenme durumunun belirlenmesi
amaçlanmıştır. Bu amaçla alınan bitki ve toprak örneklerinin analizleri
sonucunda topraklarda organik maddenin (≤ % 2.5), azot (≤ % 0.90) ve yarayışlı
fosfor içeriklerinin yetersiz (≤ 8.0 mg/kg) olduğu belirlenmiştir. Bitkilerde
azot (≤ % 3.19) noksanlığı tespit edilmiştir. Bitkilerin ortalama azot içeriği
% 2.3 olarak yetersiz düzeyde belirlenmiştir. Ayrıca aynı lokasyonda bahçeler
arasında toprak özelikleri ve bitkilerin besin elementi içerikleri bakımından
istatistiksel anlamda önemli farklılıklar bulunmuştur.
Kavun bitkisinde (Cucumis melo L.) bulunan Aphis gossypii Glover, 1877 (Hemiptera: Aphididae)’nin popülasyon yoğunluğunun belirlenmesi
Authors: ALASERHAT İsmail , CANBAY Adnan , BOZBEK Özkan , ÖZDEMİR İşıl
Published: October 2018

Bu çalışma, 2014-2016 yıllarında Erzincan iline

bağlı Merkez ve Üzümlü ilçeleri, bu ilçelere bağlı kasaba ve köylerde açık

alanda yetiştiriciliği yapılan kavun bitkisinde yoğun olarak bulunan yaprakbiti

türü olan Aphis gossypii Glover,

1877 (Hemiptera: Aphididae)’nin popülasyon yoğunluğunu belirlemek

amacıyla yapılmıştır. Bu amaçla Erzincan ili Merkez ve Üzümlü ilçelerinde kavun

bitkisinin yetiştirilen birer tarlada, fide döneminden hasat döneminin sonuna

kadar olan dönemde haftada bir kez örnekleme yapılmıştır. Tarlanın değişik

yerlerinden tesadüfen 20 bitki seçilmiş; bitkilerin alt, orta ve üst

kısımlarından birer yaprak olmak üzere toplam 60 yaprak alınarak laboratuvara

getirilmiş ve laboratuvarda stereo mikroskop altında ergin ve ergin öncesi

dönemlerinin sayımları gerçekleştirilmiştir. Böylece yaprak başına düşen

yaprakbiti sayısı belirlenmiştir. Çalışma sonucunda A. gossypii’nin

kavun bitkisi üzerinde ilk olarak 24.06.2015 (0.1 adet/yaprak) ve 08.06.2016

(0.23 adet/yaprak) tarihleri arasında görüldüğü belirlenmiştir. Ayrıca A.

gossypii popülasyonun 03.09.2015 (6.27 adet/yaprak) ve 13.07.2016 (22.5

adet/yaprak) arasında pik yaptığı da tespit edilmiştir. 
Systematic Reviews and Meta-Analyses
Authors: Rhythm Indonesian Heart
Published: October 2018

Abstracts of the 6th Annual Scientific Meeting of the Indonesian Heart Rhythm Society

Jakarta, 21-22 September 2018

Systematic Reviews and Meta-Analyses
Direct Contact Membrane Distillation for Desalination Brine Solution
Authors: Hassan Asrar Abdullah , Reda Ahmed Khalid Mohammed
Published: October 2018

Desalination is a process where fresh water produces from high salinity solutions, many ways used for this purpose and one of the most important processes is membrane distillation (MD). Direct contact membrane distillation (DCMD) can be considered as the most prominent type from MD types according to ease of design and modus operandi. This work studies the efficiency of using DCMD operation for desalination brine with different concentration (1.75, 3.5, 5 wt. % NaCl). Frame and plate cell was used with flat sheet PTFE hydrophobic type membrane. The study proves that MD is an effective process for desalination brines with feed temperature less than 60˚C especially for feed with low TDS. 37˚C, 47˚C, and 57˚C was feed temperature and 17, 22, 27˚C as permeate temperatures used in study, temperature in both sides of membrane are recorded and TDS for permeate collected to assure that there is no penetration of brine to permeate side, the results took every 30 min for time experiment of 180 min. From results, the flux increases with increasing feed temperature and flow rate, and decreasing with increasing feed concentration, experiment time, and permeate temperature.
Evaluation of the Project Overhead Costs in Iraqi Construction Industry using Fuzzy Analytic Hierarchy Process (FAHP)
Authors: Rashed Sawsan M. , Al-Dhaheri Salman A. M.
Published: October 2018

This research investigated the importance and priorities of the project overhead costs in Iraq via a questionnaire using the fuzzy analytic hierarchy process technique (FAHP). Using this technique is very important in the uncertain circumstances as in our country. The researcher reached to frame an equation through the results of the priorities of weights include the percentages of each of the main items of the project overhead costs. The researcher tested this equation by applying it to one of the completed projects and the results showed suitability for the application. The percentages of the (salaries, grants, and incentives) and (fieldwork requirements) in equation represent approximately two-thirds of project overhead costs. So the contractors should deal with the project overhead costs carefully during estimate the bid.
Bond Stresses between Reinforcing Bar and Reactive Powder Concrete
Authors: Al-Quraishi Hussein , Sahmi Nada , Ghalib Maha
Published: October 2018

A good performance of reinforced concrete structures is ensured by the bond between steel and concrete, which makes the materials work together, forming a part of solidarity. The behavior of the bond between the reinforcing bar and the surrounding concrete is significant to evaluate the cracking control in serviceability limit state and load capacity in the ultimate limit state. In this investigation, the bond stresses between reinforcing bar and reactive powder concrete (RPC) was considered to compare it with that of normal strength concrete (NSC). The push-out test with short embedment length is considered in this study to evaluate the bond strength, bond stress-slip relationship, and bond stress-crack width relationship for reactive powder concrete members. The compressive strength of concrete, the nominal diameter of reinforcement, concrete cover, and amount of steel fibers and embedded length of reinforcement were considered as variables in this study.

The test results show that the ultimate bond stress increased with increasing of the compressive strength of concrete, decreasing the nominal diameter of the reinforcing bar, increasing the concrete cover and increasing steel fiber content. In a bond stress-slip relationship, the NSC specimen shows a very short softening zone after reaching the peak point in comparisons with RPC specimen. In RPC, bond stress-slip relationship shows stiffer behavior when the steel fiber content was increased. RPC shows stepper softening zone due to the presence of steel fiber, and the absence of steel fiber cause push-out failure without descending part after peak point. Using NSC instead of RPC in anchorage between reinforcement and concrete, decrease the crack width produced due to radial tensile stresses through the push-out of reinforcing bar. In RPC, the absence of steel fiber, decrease the nominal diameter of the reinforcing bar, increase the concrete cover, decrease the embedded length of reinforcing bar cause push-out failure and vice versa cause splitting failure.
Accuracy Assessment of Stonex X-300 Laser Scanner Cameras
Authors: Jasim Luma Khalid
Published: October 2018

Assessment the actual accuracy of laboratory devices prior to first use is very important to know the capabilities of such devices and employ them in multiple domains. As the manual of the device provides information and values in laboratory conditions for the accuracy of these devices, thus the actual evaluation process is necessary.

In this paper, the accuracy of laser scanner (stonex X-300) cameras were evaluated, so that those cameras attached to the device and lead supporting role in it. This is particularly because the device manual did not contain sufficient information about those cameras.

To know the accuracy when using these cameras in close range photogrammetry, laser scanning (stonex X-300) device is used to obtain photos of a board including (23) ground control points on it, those observed from two stations and adjusted by using equations of the 3D adjusted triangulation networks by lengths and angles (hybrid routine). (10) GCPs and (13) checkpoints were used to compare the Root Mean Square Error (RMSE) of checkpoints that result from using laser scan cameras with (RMSE) of the same checkpoints that result from using digital photos (Nikon 5200D).

The result of (RMSE) comparison was ) in the X direction, ) in the Y direction and ) in the Z direction.