bluuebunny/crossref_metadata_2025 huggingface dataset:
Endoscopic endonasal transclival approach to a ventral pontine pediatric ependymoma
Authors: Rajappa Prajwal , Margetis Konstantinos , Sigounas Dimitri , Anand Vijay , Schwartz Theodore H. , Greenfield Jeffrey P.
Published: August 2013

The authors report a case of a recurrent pediatric ventral pontine ependymoma that they resected through an endonasal endoscopic transclival approach. Regarding the options for a surgical approach to ventral pontine tumors, traditional far-lateral approaches are associated with considerable morbidity due to the required muscle mobilization, brain retraction, and in-line obstruction of cranial nerves before reaching the target. The endoscopic endonasal transclival approach was made appealing by eliminating all of these concerns. The patient's fully pneumatized sphenoid sinus, laterally displaced basilar artery, and the direct ventral location of the bulky disease all further supported this unconventional choice of surgical corridor to achieve a palliative brainstem decompression of an incurable recurrence.
Epidermal Stem Cells and Their Epigenetic Regulation
Authors: Shen Qi , Jin Hongchuan , Wang Xian
Published: August 2013

Stem cells play an essential role in embryonic development, cell differentiation and tissue regeneration. Tissue homeostasis in adults is maintained by adult stem cells resident in the niches of different tissues. As one kind of adult stem cell, epidermal stem cells have the potential to generate diversified types of progeny cells in the skin. Although its biology is still largely unclarified, epidermal stem cells are widely used in stem cell research and regenerative medicine given its easy accessibility and pluripotency. Despite the same genome, cells within an organism have different fates due to the epigenetic regulation of gene expression. In this review, we will briefly discuss the current understanding of epigenetic modulation in epidermal stem cells.
The Effect of Low-Dose Marine n-3 Fatty Acids on Plasma Levels of sCD36 in Overweight Subjects: A Randomized, Double-Blind, Placebo-Controlled Trial
Authors: Venø Stine , Nielsen Michael , Lundbye-Christensen Søren , Schmidt Erik , Handberg Aase
Published: August 2013

CD36 is a scavenger receptor involved in lipid uptake and inflammation. Recently, non-cell-bound CD36 (sCD36) was identified in plasma and suggested to be a marker of lipid accumulation in the vessel wall. Marine n-3 polyunsaturated fatty acids (PUFA) may have cardioprotective effects. This study evaluated the effect of marine n-3 PUFA on sCD36 levels in overweight subjects. Fifty overweight subjects were randomized to 1.1 g of n-3 PUFA or 2 g of olive oil daily for six weeks. Neutrophils were isolated at baseline and after six weeks of treatment while an adipose tissue biopsy was obtained at baseline. The content of n-3 PUFA in adipose tissue and neutrophils was analyzed by gas chromatography, while plasma levels of sCD36 were determined using an enzyme-linked immunosorbent assay (ELISA). After six weeks of supplement plasma sCD36 did not differ between supplements (P = 0.18). There was no significant correlation between plasma sCD36 levels and n-3 PUFA in neutrophils at baseline (r = −0.02, P = 0.88), after six weeks supplement (r = −0.03, P = 0.85) or in adipose tissue (r = 0.14, P = 0.34). This study therefore does not provide evidence for a cardioprotective effect of n-3 PUFA acting through a CD36-dependent mechanism.
La céramique commune à Marseille au XVIIe siècle : l'exemple de dépotoirs domestiques du site de la Charité
Authors: Abel Véronique
Published: August 2013

La fouille d'urgence effectuée en 1983 dans la cour de l'ancien hôpital de la Charité à Marseille fut à l'origine de cette première recherche sur les céramiques utilisées dans cette cité aux époques modernes.

Deux dépotoirs domestiques purent y être assez précisément datés de la deuxième moite du XVIIe siècle. Us révélèrent la prépondérance très nette des céramiques vraisemblablement locales (de la vallée de l'Huveaune, dans l'arrière-pays marseillais) sur les productions extérieures à la région, qui ne doivent plus leur présence qu'à leur fonction spécifique. La production locale assure alors les trois-quarts de la consommation, en offrant une grande diversité de formes et de décors pour une assez bonne qualité.
De la ferme au village : Dassargues du Ve au Xlle siècle (Lunel, Hérault)
Authors: Garnier Bruno , Garnotel Alexandrine , Mercier Catherine , Raynaud Claude
Published: August 2013

Entre Camargue et Garrigue, à mi-chemin entre Nîmes et Montpellier, l'habitat de Dassargues occupe la rive droite d'un fleuve, le Vidourle. L'étude du site s'insère dans une recherche pluridisciplinaire sur le peuplement et l'aménagement du littoral languedocien, de la conquête romaine à la fin du Moyen Age. Ténue au début de la période romaine, l'occupation du site s'intensifie à partir du Ve s. pour se prolonger jusqu'au Xlle s. L'habitat connaît ensuite une phase de déclin et n'est plus occupé que ponctuellement jusqu'au XI Ve s., tandis que le terroir, englobé dans le territoire du castrum de Lunel, demeure densément exploité. Cette étude de cas illustre les temps forts de l'histoire régionale, depuis la conquête agraire tardo-antique jusqu'à l'affirmation de la société féodale dans le cadre du maillage castrai.

Des fouilles sur plus de 2 ha ont mis au jour plusieurs habitations, une église et plusieurs ensembles funéraires, mais l'essentiel des vestiges concerne l'aménagement agraire : chemins, parcellaires fossoyés, traces de plantation, silos, cabanes. Textes, prospections régionales, carto- et photo-interprétation, sont exploités conjointement et étayent l'interprétation des données de fouille.
Artisanat potier et exploitation du bois dans les chênaies du nord de Montpellier au XIIIe siècle (Hérault, Argelliers, Mas-Viel)
Authors: Breichner Hélène , Chabal Lucie , Lécuyer Nolween , Schneider Laurent
Published: August 2013

The program of excavation pursued in the area of the “Roc de Pampelune” in Argelliers, a settlement established and fortified in the VIth century A. D. and reoccupied in the XIIIth, has been associated since 1999 with a more general research concerning the occupation of the oak groves in the back-country of Montpellier during the Middle Ages. To this end, a recovery excavation was led on the summit of Mas-Viel hill where surveys had allowed the pinpointing of several red ceramic ovens. One of these ovens was able to be studied, and dated with radiocarbon to the years 1220-1287. The study of about 21000 fragments of ceramic, attributed to at least 851 different items, allows us for the first time to define typological outlines of an until-now little studied original production from the Languedoc. The botanical identification of 890 charcoal pieces and the dendrography of 79 pieces of several centimetres are evidence to the use of 8 species, mainly the Holm oak, the Box tree and the Filaire and/ or Alaterne, which were in the form of calibrated bundles of sticks. The composition of afforestations, the age and the calibre of stalks allow a rather precise evaluation of the rhythms of cutting the copses of Holm oak, including supplying combustible material to the other handicrafts. Finally, the setting up of the workshop near Valène wood acquired by the consuls of Montpellier in 1215 allows us to envisage that this ceramic ware occupied a privileged place on the table in Montpellier.
Vers une approche bio-archéologique de l'histoire de la vigne cultivée et de la viticulture : problématique, choix méthodologiques et premiers résultats
Authors: Bouby Laurent , Terral Jean-Frédéric , Ivorra Sarah , Marinval Philippe , Pradat Bénédicte , Ruas Marie-Pierre
Published: August 2013

The shape and size of grape pips have long been used as criteria in archaeobotany to discriminate wild from cultivated vines. This research is now being conducted so as to extend the set of references to the whole of Europe and the Mediterranean basin on the one hand and to improve morphometrical analysis methods to obtain a characterization going well beyond the simple wild/ cultivated dichotomy on the other hand. Among the cultivated section, the classical morphological approach might allow to distinguish at least two groups of cultivated vine species which have been more or less selected. The first group, which is also the most primitive, appears in Southern France at least as early as the First Iron Age. The soaring of the second group, which is the most productive, is not perceptible before the Modern times at the moment. The integration of carbonized archaeological grape pips in this scheme is backed on an experimental program the aim of which is modelling and correcting the deformation of pips during carbonization. The first results of a new geometrical analysis make us expect a more precise characterization of the genetic and geographic origins of archaeological pips.
Les origines médiévales d’une technique de charpente : la poutre armée
Authors: Bouticourt Emilien , Guibal Frédéric
Published: August 2013

An inventory of medieval carpentry works has now been conducted for several years in the Middle Rhône Valley. Among the various types of frameworks then in use, the use of trussed beams for the construction of ceilings in the region appears as an original mode of timber framing. The first part of the study deals with this technique through modern treatises on carpentry and writings going back to the Quattrocento. Then follows a technical analysis of the trussed beam in Provence from data provided by texts, the archaeological study of the remains of the Hôtel de Rascas in Avignon and the dendrochronological analysis of woods. A badly known aspect of the architecture of Provence is thus revealed in the light of these data.
Intracranial Transplant of Olfactory Ensheathing Cells Can Protect Both Upper and Lower Motor Neurons in Amyotrophic Lateral Sclerosis
Authors: Li Ying , Chen Lin , Zhao Yanxiu , Bao Jianling , Xiao Juan , Liu Jingyuan , Jiang Xiaorong , Zhou Changman , Wang Hongmei , Huang Hongyun
Published: August 2013

Amyotrophic lateral sclerosis (ALS) is a fatal disease that involves the degeneration of cortical and spinal motor neurons. Mutant SOD1G93A rats constitute a good animal model for this pathological condition. We have previously demonstrated that transplantation of neonatal olfactory ensheathing cells (OECs) into the dorsal funiculus of the spinal cord of mutant SOD1G93A transgenic rats increases the survival of spinal motor neurons and remyelinates the impaired axons through the pyramidal tract. In the present study, we examine whether intracranial cell implantation could also exert a similar effect on cortical motor neurons and on the lower motor neurons in the spinal cord. We injected OECs from the bulb of 7-day-old GFP green rats into the corona radiata of adult SOD1 mutant rats stereotaxically to observe any changes of the upper motor neurons as well as the lower motor neurons. We found that more motor neurons at both the motor cortices and ventral horns of the spinal cord survived in grafted ALS rats than in control rats. Prolonged survival and behavioral tests including a screen test, hind limb extension, rotarod, and gait control showed that the treated animals were better than the control group. This manuscript is published as part of the International Association of Neurorestoratology (IANR) supplement issue of Cell Transplantation.
Gold(I)-catalyzed formation of furans from γ-acyloxyalkynyl ketones
Authors: Hoffmann Marie , Miaskiewicz Solène , Weibel Jean-Marc , Pale Patrick , Blanc Aurélien
Published: August 2013

Various γ-acyloxyalkynyl ketones were efficiently converted into highly substituted furans with 2.5 mol % of triflimide (triphenylphosphine)gold(I) as a catalyst in dichloroethane at 70 °C.
Surface Integrity of Ti6Al4V Alloy under Dry Sliding Conditions
Authors: Doni Zinaida , Buciumeanu Mihaela , Palaghian Liviu
Published: August 2013

The present paper is aimed to investigate the evolution of the surface integrity of Ti6Al4V alloy under reciprocating sliding in contact with bearing steel and ceramic balls (Al2O3). The evolution of the surface integrity states is characterized by the evolution of the surface topography and 3D roughness parameters with the applied normal load. The tribological characteristics (coefficient of friction and weight loss) are also presented for the two contact pairs used in this study. This study has proved that Ti6Al4V/Al2O3 contact pair can be used in applications were the applied load is variable.
The Residual Stress State Generated by Single Point Incremental Forming of Aluminum Metal Sheets
Authors: Radu Maria Crina , Herghelegiu Eugen , Tampu Catalin Nicolae , Cristea Ion
Published: August 2013

Single point incremental forming (SPIF) is a process during which at any moment a very small part of the sample is actually being formed. This progressive highly localised deformation is performed by a simple tool, whose trajectory is numerical controlled by a CNC machine. Since no support for the metal sheet is used during forming, large levels of deformation occur, which in turn, induce highly non-uniform residual stresses that affect the accuracy of the processed parts.
The aim of the present paper was to inspect, experimentally and by simulation, the state of the residual stresses induced in SPIFed double frustums of pyramids made by A1050. The hole drilling method was used for the experimental measurements and the LS-Dyna software for simulation.
Drawing Study of Sheet Bimetallic Brazed Parts
Authors: Olaru Ionel
Published: August 2013

In this paper we propose to analyze drawing of bimetallic sheets joined by brazing. Drawing is the transformation of a plan workpiece to the drawn part or workpiece transformation with decreasing of depth corresponding transverse dimensions. The brazing process is based on the difference in the melting points of the base materials and filler metal. During the brazing process, the bimetallic sheets to be assembled are heated for at a temperature between the melting temperatures of the two alloys, this process tends to modify the geometry and the microstructure of the brazed sheets.
Aspects of Finite Element Analysis of Microdrilling by Ultrasonically Aided EDM and Related Knowledge Management
Authors: Ghiculescu Daniel , Marinescu Niculae , Ghiculescu Daniela , Nanu Sergiu
Published: August 2013

Ultrasonic vibrations of electrode-tool and workpiece were applied successfully in specific cases to increase some parameters at micro-EDM, this working mode being characterized through machining instability due to vary narrow working gap. Our researches proved that all main technological parameters of micro-EDM can be improved by ultrasonic aiding (μEDM+US) in terms of machining rate, volumetric relative wear and surface roughness if some optimization conditions of working parameters are fulfilled. A multiphysics Finite Element Analysis (FEA) of material removal mechanism was achieved using two time dependent modules of Comsol 4.2 in order to attain the working parameters optimization. The FEA results compared to experimental data aiming at model validation led to some useful measures to optimize the working parameters. The knowledge management process was approached in order to suggest how human resource from an organization that uses μEDM+US can apply and improve the research results. Our EDM+US strategy is based on relative long pulse time with very low current overlapped on collective bubbles implosion occurring at the final of a liquid ultrasonic stretching semiperiod, and relative low consumed power on ultrasonic chain, contributing to increase the main output technological parameters mentioned above.
Environmental Attributes of EDM Process
Authors: Soaita Dumitru
Published: August 2013

EDM is presently known as the best available technology (BAT) to solve various problems in machine construction. This paper attempts to provide some answers to the question - is EDM a clean technology Working methodology consisted in processing literature data and data obtained from authors experimental research on the environmental impact of EDM. In conclusion, there are several issues to be solved before EDM can be considered a clean technology. The article also suggests solutions for these problems.
Aspects Regarding the Technologies on Wire EDM CNC Machines
Authors: Mocian Ioan , Cazacu Razvan
Published: August 2013

The present paper presents an application for the computer aided generation of the programs for the wire cut EDM CNC machine ONA AE 300. The technological performances of this machine are highlighted, along with the implications of the work regimes on the generation of the machine programs. The application is developed for the AutoCAD environment, being written in VB.NET. The trajectories are defined as polylines between the Start and Stop points and the technological information is introduced by the user inside a dialog. The output of the application is a text file with the complete program for the ONA AE 300 machine.
Experimental and Mathematical Considerations on Roughness Resulting from "ATSi12CuMgNi" Turning Alloys Using Poly-Crystalline Diamond Tools
Authors: Zapciu Aurel , Munteanu Iulian Sorin , Zapciu Aurelian
Published: August 2013

The importance of using silicon aluminum alloys - with composite structure, on large scale, in the production of vehicle parts (in automotive industry like: pistons, cylinder heads, cylinders, water pumps body, stirrups, etc.), is very high, when it comes to industrial purposes. One of the most used methods of processing by cutting with production tools with the working part of made of poly-crystalline diamond is turning, thus, systemic analysis is necessary to study the dynamics of the process. The paper presents results of experimental research regarding the roughness resulting in the process of turning "ATSi12CuMgNi" alloys using poly-crystalline diamond tools, in order to determine all the parameters involved in the mathematical modelling of roughness, the importance of this parameters from quantitative and intrinsic point of view, and the evaluation of resulted roughness based on experimental results, in order to improving the machinability of silicon aluminum alloys.
Experimental Studies Regarding Mechanical Behaviour of Textile Reinforcements Laminated Composite Materials
Authors: Oleksik Mihaela , Cofaru Nicolae Florin , Oleksik Valentin
Published: August 2013

The aim of this paper is to determine the mechanical properties of textile reinforcements laminated composite material and to establish the influence of thickness about these properties. The composite material used for this is a laminated sheet of HGW 2082. In order to study the mechanical behaviour of these kinds of materials we select two experimental tests: uniaxial test and bending test. For the uniaxial test we have measured the maximum load, the maximum extension, the maximum tensile stress and the maximum tensile strain. Also, using an optical extensometer we measured the major and the minor strains. For the bending test we measured the maximum load and the maximum bending deflection and the major and minor strains. After the uniaxial tension tests we can draw that we obtained the following results: the maximum value of the local major strain and equivalent strain decreases with the increase of the specimen thickness. After the bending test we can draw the following conclusions: the maximum value of the bending deflection decreases with the increase of the specimen thickness while the maximum value of the local major strain increases with the increase of the specimen thickness.
Transmission Ratio Optimization of Electric Driven Palletizing Mechanism
Authors: Mihaila Lucian Adrian , Stan Gheorghe , Funaru Marian , Andrioaia Dragoș
Published: August 2013

One of the main objectives in obtaining high productivity on machining centers is the reduction of auxiliary times consumed with the tool and workpiece change. In the case of workpiece change the auxiliary time is reduced by adopting the use of an automatic pallet changer system and implicitly of pallets, while in the case of tool change this time is reduced using an automatic tool changer system. The optimization of the constructive and functional parameters of palletizing systems, in the purpose of decreasing auxiliary times, implies increased speed and accelerations, inertia reduction, an optimum transmission ratio, component mechanisms coupled movements, increasing the positioning accuracy of the pallet on the machine table. This paper presents the methodology of transmission ratio optimization of an electric driven pallet changer mechanism, the main purpose is to obtain the maximum acceleration. In order to find the maximum acceleration of the electric driven pallet changing mechanism considered, and thus minimizing the total changing time, we use the equilibrium equation of the moments reduced to the motor shaft. Following the proposed methodology we obtain the maximum acceleration of the considered pallet changer mechanism. Also we issue some constructive indications for future designing of electric driven pallet changer mechanisms.
Converting Point Cloud to Revolved Solids
Authors: Drăgoi Mircea Viorel , Navalušić Slobodan
Published: August 2013

3D scanning is one of the basic methods to gather data for reverse engineering. The main drawback of 3D scanning is that its output - the point cloud - can never be used directly to define surfaces or solids useful to reconstruct the electronic 3D model of the scanned part.The paper presents a piece of software designed in VisualLISP for AutoCAD, software that acts as a point cloud to 3D primitives converter. The novelty consists of the method used to find the parameters of the primitive that best fits to the point cloud: the mass properties of regions are used to find the center of a cones cross section. Parts have been scanned and the point clouds processed. The results obtained prove the correctness of the algorithm and of the method applied. A piece of software that processes the point cloud in order to find the 3D primitive that it fits the best has been developed. The output is the 3D primitive that successfully and accurate replaces the point cloud. Some adjacent tools were designed, so the entire software package becomes a useful tool for the reverse engineering user. The ways the researches can be continued and developed are foreseen, as well
Estimating the Life-Cycle of the Medical Implants Made by SLM Titanium-Alloyed Materials Using the Finite Element Method
Authors: Păcurar Razvan , Păcurar Ancuţa , Bâlc Nicolae , Petrilak Anna , Morovič Ladislav
Published: August 2013

Within this article, there are presented a series of researches that were developed for the first time in Romania, in the field of customized medical implants made by using the Selective Laser Melting (SLM) technology. Finite Element Method (FEM) has been successfully used in order to analyze the fatigue and to determine the durability of a customized medical implant that has been selected for the made analysis. The material characteristics taken into consideration within the Finite Element Analysis (FEA) that has been performed were the ones of two types of dedicated metallic powders which are commercially available (TiAl6Nb7 and TiAl6V4 material) and suitable for the SLM 250 HL equipment from the SLM Solutions GmbH Company from Lubeck, Germany. The Finite Element Analysis made in the case of these two types of SLM titanium alloyed materials, proved that the modified characteristics, such as the yield strength and hardness of the material are significantly influencing the durability of the medical implants made by SLM technology.
Study of Flow Font Advancement during Filling Stage of a Spiral Mold
Authors: Sandu Ionut Laurentiu , Stan Felicia , Fetecau Catalin
Published: August 2013

The objective of this paper consists in the determination of the flow front length using o circular spiral mold. The paper also studies the influence of the process parameters on the flow front length using the method of statistical analysis. For this purpose, a number of numerical simulations are carried out by utilizing the combination of four process parameters (i.e., the melt temperature, the spiral thickness, the injection pressure and the mold temperature) at three levels. In order to reduce the number of numerical simulations, a simplistic Taguchi L27 orthogonal array was chosen. The material chosen for this study was a low density polyethylene and a high density polyethylene. The flow front length was measured through a marked pattern of the circular spiral using the AutoCAD.
Ankle Foot Orthoses with Wire Insertion
Authors: Badescu Mircea , Purcar Carmen , Badescu Delia
Published: August 2013

The objective of the work is to present some researches regarding the virtual modelling of external medical devices with wire insertion. Ankle foot orthoses are used to correct and prevent different disfunctions of the human body and also in athlets recovery. The research is motivate by the problems appeared using this medical devices: durability issues, patient confort, manufacturing costs, lightweight, flexible access to shoes, inexpensive, readily available. These issues depends of the wey design, manufacturing technology, materials used, patient behavior, skills manufacturer. Wire insertion in polypropylene is a new approach of orthoses materials.
Numerical Analysis of Load Carrying Capacity in the Contact between High-Order Surfaces
Authors: Spînu Sergiu , Gradinaru Dorin
Published: August 2013

The strength of the contact between high-order polynomial surfaces, optimized as to induce a close to uniform pressure distribution on the contact area, is investigated by computer simulation. Three type of contact conditions are examined, i.e. frictionless, gross slip and partial slip, and the depth and magnitude of the maximum of von Mises equivalent stress field is assessed using the Greens functions for the elastic half-space and a multi-summation technique based on the fast Fourier transform and on the convolution theorem. The set of simulations allows formulating recommendations concerning the use of punches bounded by high-order polynomial surfaces to increase the load-carrying capacity of the non-conforming mechanical contact.
Influence of the Temperature and Mechanical Stresses Generated by Milling Process in Machined Part Surfaces on their Accuracy
Authors: Tampu Nicolae Catalin , Radu Maria Crina , Chirita Bogdan
Published: August 2013

Surface generation by milling process involves the occurrence of some complex effects that affect surface quality. The most important effects of the milling on the generated surface are heating, plastic strain and residual stress. The aim of the present research is to analyze the influence of the work piece temperatures and residual stress distributions generated by milling in the machined surfaces on its accuracy. Two types of materials and different cutting parameters have been used in order to determine the above mentioned connection. The obtained results show that the temperature and residual stress generated by milling influences the surface deviations from flatness.
Device for Supplying the Hydrostatic Pockets with Compensation of the Fluid Temperature
Authors: Pascu Marius , Stan Gheorghe , Obreja Claudiu , Andrioaia Dragoș
Published: August 2013

The supply devices of the hydrostatic guideway pockets are elements with a major influence on the rigidity of the machine tool guideways. The value of the flow that circulates through these devices depends on the fluid viscosity as well. The researches in this field show that an important increase of the fluid temperature is produced when it passes through various orifices, slits and interstices that belong to the hydrostatic systems. The increase of the working temperature leads to decreasing the kinematic viscosity, with undesirable effects on the functioning of the hydrostatic guideways. In order to minimize this disadvantage, this work is presenting a constructive solution of a fixed supply device (flow control valve) with fluid temperature compensation. This type of device avoids the negative effects of increased fluid viscosity caused by the temperature increase as well, by automatically modifying the flowing cross section that is performed through a compensation bushing. The constructive solution of the new supply device is simple and involves relative low workmanship and costs. This supply device has been experimented on a rotary table model MRD 1500x2000, on the linear axis of 2200 mm travel. Through the comparative analyses of the new solution versus the standard one that was using as supply device a capillary type resistor, an increase of the guideway rigidity by 13% has resulted.
Designing a Specialized Devices for Correction of the Axis Deviation at the Human Leg
Authors: Cofaru Ileana Ioana , Brîndaşu Paul Dan , Cofaru Nicolae Florin
Published: August 2013

The presented article is an original contribution which implies the design of a specialized device for high tybial osteotomy (HTO) optimization. In the papers are presented the sources that imply HTO, the axial deviations of the human lower member from the correct position. This sources are the gonarthosys owed to the usage of the knees cartilages or owed to some diseases (such as the Blount disease) and the vicious consolidated fractures. After presenting the needs to realize such a specialized device for HTO, the principal requests the device shall fulfill are underlined. Starting from these , two sub ensembles were projected, one for the tibial positioning and for the execution of the hole from the center of rotation of angulation (CORA), and the second one for the realization of the cuts. Both sub ensembles have been 3D modeled in Catia V5R20. The model was designed mounted on the bone.
Improving Functional Parameters for Hydro-Mechanical Systems from Treatment Station of Water
Authors: Alexandrescu Aurora , Miron Simona Adina
Published: August 2013

This paper aims to analyze the connections between the functional parameters of pumping station and the quality parameters of drinkable water: 1) The connections estimation between the pumps head, flow and the waters turbulence. 2) The values analyze of chlorine and ammonium concentration depending on flow. 3) The water conductivity analyzes depending on flow.
Optimal Pump Scheduling to Reduce the Operating Costs
Authors: Miron Simona Adina , Alexandrescu Aurora , Luca Mihail
Published: August 2013

The pumps are mechanical structures indispensable in numerous socio-economic areas like: villages water supply, irrigations, oil industry, sewage movement, chemical movement, flood control and for the production of various goods. Pumps must supply the energy necessary to lift liquids from a lower elevation to a greater one. Pumps operation and maintenance generates significant costs.
One of the most efficient methods to reduce the pump operating costs is by scheduling the pump operations. This can impose pumps to operate during periods in which the electrical tariff is cheaper and combining the operations of several pumps in an efficient way.
This paper aims to analyze the possibilities and the limits of using SPEA2 multi-objective optimization algorithm implemented in Matlab in order to schedule the pumps.
SPEA2 was used for the first time to schedule the pumps from a water supply system by [. In that paper the algorithm was applied in Linux. This paper presents the results obtained by SPEA2 implemented in a very used programming language, Matlab. The algorithm was improved in order to obtain better solutions.
In this paper we applied the optimization methods of the pump schedule to a water supply system, but these methods can be used to minimize the operational costs of any system that incorporates pumps.
Design of an Automatic Tool Changer System for Milling Machining Centers
Authors: Obreja Claudiu , Stan Gheorghe , Andrioaia Dragoș , Funaru Marian
Published: August 2013

In the field of manufacturing processes it is observed that the trend is to produce more and more fast, efficiently parts with high complexity, which involves using a high number of tools in the machining process. One of the main solutions for high speed and efficient manufacturing is based on the full automation of the entire manufacturing process. The automatic changing of the tools involved in the manufacturing process is carried out by the automatic tool changing mechanism, thus the auxiliary non-productive time consumed with the tool change is highly minimized. In this paper we present a novel automatic tool changer which is both simple and compact, and any milling machining center provided with chain or disc tool magazine can be equipped with. Also by adopting the use of this tool changing mechanism other subassemblies of the tool changing system, such as the tool transfer mechanism and the waiting position, are substituted by this changing mechanism. The auxiliary movements needed to bring the tool from the magazine into the waiting position are overlapped with the machining time, so that the total time for exchanging the tool in the spindle with the tool from the magazine is minimized.
Influence of Tool Clearance Values on the Quality of the Small Drawn Parts
Authors: Brabie Gheorghe , Costache Elena , Bologan Maria
Published: August 2013

A proper clearance between the working tools components is a very important factor that can permit to obtain micro or milli drawn parts in accordance with their theoretical profile. The present paper analyses the results of investigations made by experiment and simulation concerning the influence of tool clearances value on the micro and milli drawn parts quality. The main negative effects of the inadequate tool clearances that can occur during deep drawing of such parts (deviations from the part theoretical profile: wall inclination, wall curvature, modification of part edge radius; intensification of different phenomena: springback, wrinkling and cracking) were especially analyzed in the paper. On the basis of the present analysis the optimum values of tool clearances were established in order to avoid their negative effects.
Influence of the Blank Initial State on the Quality of the Small Drawn Parts
Authors: Costache Elena , Brabie Gheorghe , Jitaru Augustin
Published: August 2013

An optimum blank quality presents the following several benefits on the drawn part quality: it leads to an improved quality of the parts; it prevents some negative phenomena (like: fracture, a uniform distribution of material thickness in the drawn part and reduction of the blank holder force required during the drawing process). In the present work, an analysis was performed concerning the influence of the initial state of blank (microhardness, thickness, surface roughness and topography) on the quality of micro/milli cylindrical drawn parts made from aluminium alloy sheets having the following thicknesses: 0.10 and 0.20 mm.
V Prism Special for Centering Devices
Authors: Pămîntaş Eugen , Banciu Felicia Veronica
Published: August 2013

Centering cylindrical parts is a very common operation meet in different cutting processes on various types of machine tools. To this purpose they are intended to use auxiliary assemblies known as "centering devices", they can achieve centering "between centers" on exterior or interior cylindrical parts surfaces, and are of the following types: universal, special or specialized, single or multiple. Solutions constructive diversity and the their drive variants known in technical literature is huge and mainly is limited numerically by restrictions related on the one hand, by technical indicators: diameter range of machining parts production batch number, type of the drive, and the machine-tools type that will make his job, positioning accuracy required, and on the other hand, economic indicators: processing costs, cost device maintenance costs. Limiting the topic only to the cylindrical parts with at least two steps of diameters that require centering on outer cylindrical surfaces, the known centering devices variants are reduced mainly to those using pairs of V-shaped prisms and with synchronous movement. The difficulty of working with such devices is the multitude and softness adjustments to be made; so that the part axis remains invariant spatial after fixing the cylindrical part on at least two levels simultaneously. The paper proposes a special prism profiled, used in the construction of such centering device in which one of the operative surfaces of the prism is not flat, but curved surface, which was determined analytically.
Advanced Quality Planning of Manufacturing Products - APQP
Authors: Ciobanu Doina Valentina , Dumitrascu Adela Eliza , Tudosoiu Catalin , Borz Stelian Alexandru
Published: August 2013

Implementation of management by processes in Romania it is a problem if we consider its effects: improving performances of organizations expressed in terms of quality, process duration, cost, etc. Taking into account the sequence of steps corresponding to the specific managerial process and quality management, it is considered that its functions are: planning, organizing, coordinating, controlling, quality assurance and improvement. This paper presents a detailed approach of advanced product quality planning (APQP) of technological products and the case study regarding the analysis of industrial product defects implementing statistical process control (SPC). The Production Part Approval Process (PPAP) purpose continues to be to provide the evidence that the specification requirements are clearly understood by the organization and the manufacturing processes are the designed capability. Implementing the APQP technique permits us to define and establish the steps necessary to ensure that a product satisfies the customers requirements.
Contributions to Ranking an Ergonomic Workstation, Considering the Human Effort and the Microclimate Parameters, Using Neural Networks
Authors: Anghel Daniel Constantin , Belu Nadia
Published: August 2013

The paper presents a method to use a feed forward neural network in order to rank a working place from the manufacture industry. Neural networks excel in gathering difficult non-linear relationships between the inputs and outputs of a system. The neural network is simulated with a simple simulator: SSNN. In this paper, we considered as relevant for a work place ranking, 6 input parameters: temperature, humidity, noise, luminosity, load and frequency. The neural network designed for the study presented in this paper has 6 input neurons, 13 neurons in the hidden layer and 1 neuron in the output layer. We present also some experimental results obtained through simulations.
Aspects of Quality Assurance in Glass Bricks Manufacturing Process
Authors: Rus Madalina , Mereuta Elena , Veresiu Silvia
Published: August 2013

During the last decades, the concept of quality suffered deep transformations by becoming strongly aware of the fact that the responsibility regarding quality belongs not only to the quality manager but also to the entire staff. In other words, the top management has to create such a quality management system so that to be able to continuously control all the activities involved in achieving quality. This paper will show a few examples of how the quality control instruments are applied (using graphic methods of presentation) in order to solve some problems that can occur in an economic society.
Conceptual Research Model of Factors that Influence Environmental Knowledge Management at Organizational Level
Authors: Herghiligiu Ionut Viorel , Lupu Mihaela Luminiţa , Robledo Christian , Kobi Abdessamad
Published: August 2013

Accelerated development of humanity in recent decades generated a double effect as a result: (a) the development of economies, creating social welfare, on the one hand, and (b) a enormous pressure on the environment, causing pollution, on the other hand. Therefore the organizations need efficient management systems - which can be considered - to give them a plus on the competitive market; environmental management system with environmental knowledge management subsystem (EKMS) can be considered as the key to success of industrial organization. Low efficienty level of environmental knowledge management, operated by decisional agents (simple employee or manager in the position they hold) in the Romanian organizations (mainly the industrial organizations) is the main problem approached by this paper (MP). This paper intends to resolve the problem covered above (MP) designing a quality analysis model for environmental knowledge management and sinecvanon identifying the important factors that influence it (collecting data / information from: a. analysis of different documents (environmental documentation / job descriptions / organization and operation regulations) from the 10 industrial organizations of NE Region of Romania and beyond; b. analysis of the specialized literature (focusing on previous studies conducted)).
Designing Peculiarities and Classification of Compositional Technologies in Mechanical Engineering
Authors: Mikhaylov Aleksandr , Mikhaylov Dmitriy , Mikhaylova Elena , Petryaeva Irina , Navka Ilia
Published: August 2013

Scientific technical progress demands of technologists decision of questions concerning cardinal improvement of quality of engineering products, and also providing of breakthrough aggregation of features and their practicality measure. In particular, it is necessary for hardware which works under severe operation conditions, and to features of which great demands are made. There are a lot of different functions which affect products in operation conditions. And these functions have variable action parameters. That fact in some cases leads to quick product function loss and to reduction of operating properties of machine or technological system. So, engineering products should be provided by unconventional properties [1, 2, . In order to resolve the problems we need nontraditional approaches in development of fundamentally new technologies. They should allow solving complicated problems of new generation of machines development with properties composition, got through application of different in significance technologies [.
An Approaching on Fuzzy Logic Application for Typical Parts Manufacturing
Authors: Turc Cristian , Banciu Felicia Veronica , Pămîntaş Eugen
Published: August 2013

The paper presents a fuzzy logic based algorithm for the choosing of the gearbox housing work piece in some production conditions. In many cases this problem is solved empirically, based on the experience of the manufacturer. The present work uses the so-called rating of suitability of a part for a certain manufacturing method. It consists of the formalization of the knowledge regarding the production conditions (production volume, loading conditions) using fuzzy sets and then the work piece choosing decision through the comparison between the ratings of suitability of the given part for the considered manufacturing methods that can be used to obtain the given work piece (steel welded, cast iron and aluminum). In order to obtain a general point of view regarding the suitability rate for a specific set of production conditions, a fuzzy logic MATLAB® toolbox was adapted. The described fuzzy logic algorithm allows a rapid, argued choosing of the work piece type in the production of gearbox housings.
Basic Research for the UV Fixed Abrasive Lapping Plate
Authors: Marinescu Ioan , Guo Lei , Wei Peng
Published: August 2013

The traditional lapping procedure is based on a slurry process. This paper describes the development of a novel fixed abrasive lapping plate (UV-plate) and investigates the basic property of ultraviolet-cured resins. The primary lapping experiments are carried out. Experimental results show that the lapping process performed with UV-plate significantly increases machining efficiency. It is proved that the surface roughness of machined work-piece by UV-plate is better compared with the conventional slurry lapping plate.
Wettability of Carbon Nanotubes with Molten Sn-Ag-Cu Solder Alloy
Authors: Chantaramanee Suchart , Wisutmethangoon Sirikul , Sikong Lek , Plookphol Thawatchai
Published: August 2013

The purpose of this work was to study the wettability of single-walled carbon nanotube (SWCNTs) and molten 96.5Sn-3.0Ag-0.5Cu (SAC305) lead-free solder alloy. The SWCNTs was coated with silver (Ag) by using an electroless plating method in order to enhance its wettability. The wetting behavior of molten SAC305 alloy on three different substrates, alumina, un-coated SWCNTs and Ag-coated SWCNTs was investigated by employing a modified sessile drop technique. The wetting angle between the molten SAC305 and the three substrates was measured at temperature range of 250-550 °C. The average wetting angles between the molten SAC305 and the alumina, the un-coated SWCNTs and the Ag-coated SWCNTs substrates were 130.7±1.3°, 128.4±4.2° and 120.1±3.5°, respectively. The wettabilty of the SWCNTs was improved by coating it with silver. The wetting angle of the Ag-coated SWCNTs was decreased approx. 9° compared to that of the un-coated. Increasing temperature has slightly affected on the wettability of SWCNTs and the molten SAC305.
Influence of Building Materials on Building Airtightness
Authors: Kraus Michal , Černá Markéta , Hrubá Barbora , Součková Barbora , Kubečková Darja
Published: August 2013

The aim of the contribution is to confirm or rule, by using non-parametric Kruskal Wallis test, the hypothesis published [1] that the construction type and building materials have not statistically relevant effect on the final building airtightness. For non-parametric test is used the same sample as in [1], where the impact of construction type on the airtightness is refused by using parametric test - one way analysis of variance (ANOVA).
Shear Behavior of Squat Steel Fiber Reinforced Concrete (SFRC) Shear Walls with Vertical Slits
Authors: Lim Won Gyun , Kang Su Won , Yun Hyun Do
Published: August 2013

Three 1/3-scale squat steel fiber reinforced concrete (SFRC) shear walls with height-to-length ratio of 0.55 were manufactured and tested up to failure. Two walls (SFRC-SS and-LS) are similar to each other except the height (230 and 460mm) of vertical slits with the width of 40mm. For comparison, solid wall (SFRC-NS) was made. All specimens had the same rectangular cross-section of 1,100mm x 50mm, with wall panel height of 600mm. The experimental results showed that squat SFRC shear walls with vertical slits exhibited more stable hysteretic behavior than a solid SFRC shear wall. Vertical slits on the squat SFRC shear walls improve the ductility and energy dissipation capacity but decrease the load-carrying capacity and stiffness of squat SFRC walls.
Influence of Repeated Quenching on Bearing Steel Martensitic Structure Investigated by Homology
Authors: Nakane Kazuaki , Kida Katsuyuki , Honda Takashi , Mizobe Koshiro , Santos Edson Costa
Published: August 2013

JIS SUJ2 (high carbon high strength bearing steel) heat treated by repeated quenching was investigated. The microstructure of the bearing traces was observed after heat treatment by laser confocal microscope. In this paper, by mathematical methods, we try to evaluate quantitatively this change of the structure. Homology is a branch of mathematics that allows quantitative describing characteristics of a figure by replacing the figure with algebra. Applying homology we can express the degree of the connection of the figure. Here we use homology to quantify the change of structures by repeated quenching. Keyword: Homology, Rolling contact fatigue, SUJ2, repeated quenching