bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Dual Modification of Al-17%Si Alloys by Structural Heredity
Authors: Zhang Jing , Chen Hongmei , Yu Hui , Jin Yunxue
Published: June 2015

In this study, Al-17%Si alloys were dual modified by fine-grained structural materials (FSM) according to structural heredity. Microstructure and thermal analyses were undertaken to study the modification effect of the FSM master alloy on primary and eutectic Si. Primary Si is refined to a smaller size and eutectic Si is modified from needle-like to fibrous shape after FSM master alloy addition. The optimal content of FSM master alloy is 20% and the holding time is 15min. Finer FSM master alloy leads to finer Al-17%Si alloy microstructure and more area percentage of α-Al. DSC analyses results show that FSM master alloy can raise the precipitation temperatures of primary and eutectic Si, meanwhile it can reduce the latent heat of Si solidification process.
Development of a Large Set of Microsatellite Markers in Zapote Mamey (Pouteria sapota (Jacq.) H.E. Moore & Stearn) and Their Potential Use in the Study of the Species
Authors: Arias Renée , Martínez-Castillo Jaime , Sobolev Victor , Blancarte-Jasso Nasib , Simpson Sheron , Ballard Linda , Duke Mary , Liu Xiaofen , Irish Brian , Scheffler Brian
Published: June 2015

Pouteria sapota is known for its edible fruits that contain unique carotenoids, as well as for its fungitoxic, anti-inflammatory and anti-oxidant activity. However, its genetics is mostly unknown, including aspects about its genetic diversity and domestication process. We did high-throughput sequencing of microsatellite-enriched libraries of P. sapota, generated 5223 contig DNA sequences, 1.8 Mbp, developed 368 microsatellites markers and tested them on 29 individuals from 10 populations (seven wild, three cultivated) from Mexico, its putative domestication center. Gene ontology BLAST analysis of the DNA sequences containing microsatellites showed potential association to physiological functions. Genetic diversity was slightly higher in cultivated than in the wild gene pool (HE = 0.41 and HE = 0.35, respectively), although modified Garza–Williamson Index and Bottleneck software showed evidence for a reduction in genetic diversity for the cultivated one. Neighbor Joining, 3D Principal Coordinates Analysis and assignment tests grouped most individuals according to their geographic origin but no clear separation was observed between wild or cultivated gene pools due to, perhaps, the existence of several admixed populations. The developed microsatellites have a great potential in genetic population and domestication studies of P. sapota but additional sampling will be necessary to better understand how the domestication process has impacted the genetic diversity of this fruit crop.
Synthesis of (E)-2-Styrylchromones and Flavones by Base-Catalyzed Cyclodehydration of the Appropriate β-Diketones Using Water as Solvent
Authors: Pinto Joana , Silva Vera , Silva Ana , Silva Artur
Published: June 2015

A low cost, safe, clean and environmentally benign base-catalyzed cyclodehydration of appropriate β-diketones affording (E)-2-styrylchromones and flavones in good yields is disclosed. Water was used as solvent and the reactions were heated using classical and microwave heating methods, under open and closed vessel conditions. β-Diketones having electron-donating and withdrawing substituents were used to evaluate the reaction scope. The reaction products were isolated in high purity by simple filtration and recrystallization from ethanol, when using 800 mg of the starting diketone under classical reflux heating conditions.
Plasmodium falciparum Thioredoxin Reductase (PfTrxR) and Its Role as a Target for New Antimalarial Discovery
Authors: McCarty Sara , Schellenberger Amanda , Goodwin Douglas , Fuanta Ngolui , Tekwani Babu , Calderón Angela
Published: June 2015

The growing resistance to current antimalarial drugs is a major concern for global public health. The pressing need for new antimalarials has led to an increase in research focused on the Plasmodium parasites that cause human malaria. Thioredoxin reductase (TrxR), an enzyme needed to maintain redox equilibrium in Plasmodium species, is a promising target for new antimalarials. This review paper provides an overview of the structure and function of TrxR, discusses similarities and differences between the thioredoxin reductases (TrxRs) of different Plasmodium species and the human forms of the enzyme, gives an overview of modeling Plasmodium infections in animals, and suggests the role of Trx functions in antimalarial drug resistance. TrxR of Plasmodium falciparum is a central focus of this paper since it is the only Plasmodium TrxR that has been crystallized and P. falciparum is the species that causes most malaria cases. It is anticipated that the information summarized here will give insight and stimulate new directions in which research might be most beneficial.
Antioxidant Capacities and Analysis of Phenolic Compounds in Three Endemic Nolana Species by HPLC-PDA-ESI-MS
Authors: Simirgiotis Mario , Benites Julio , Areche Carlos , Sepúlveda Beatriz
Published: June 2015

The antioxidant features, polyphenolic composition and chromatographic fingerprints of the aerial parts from three Chilean endemic plants from the Paposo Valley located on the cost of the Atacama Desert were investigated for the first time using high pressure liquid chromatography coupled with photodiode array detector and electrospray ionization mass analysis (HPLC-PDA-ESI-MS) and spectroscopic methods. The phenolic fingerprints obtained for the plants were compared and correlated with the antioxidant capacities measured by the bleaching of the DPPH radical, the ferric reducing antioxidant power (FRAP) and quantification of the total content of phenolics and flavonoids measured by spectroscopic methods. Thirty phenolics were identified for the first time for these species, mostly phenolic acids, flavanones, flavonols and some of their glycoside derivatives, together with three saturated fatty acids (stearic, palmitic and arachidic acids). Nolana ramosissima showed the highest antioxidant activity (26.35 ± 1.02 μg/mL, 116.07 ± 3.42 μM Trolox equivalents/g dry weight and 81.23% ± 3.77% of inhibition in the DPPH, FRAP and scavenging activity (SA) assays, respectively), followed by N. aplocaryoides (85.19 ± 1.64 μg/mL, 65.87 ± 2.33 μM TE/g DW and 53.27% ± 3.07%) and N. leptophylla (124.71 ± 3.01, 44.23 ± 5.18 μM TE/g DW and 38.63% ± 1.85%).
Ethanolic Extracts of Pluchea indica Induce Apoptosis and Antiproliferation Effects in Human Nasopharyngeal Carcinoma Cells
Authors: Kao Chiu-Li , Cho Joshua , Lee Ya-Zhe , Cheng Yuan-Bin , Chien Chih-Yen , Hwang Chung-Feng , Hong Yi-Ren , Tseng Chao-Neng , Cho Chung-Lung
Published: June 2015

Pluchea indica is used in traditional medicine for the treatment of lumbago, ulcer, tuberculosis and inflammation. The anti-cancer activities and the underlying molecular mechanisms of the ethanolic extracts of P. indica root (PIRE) were characterized in the present study. PIRE strongly inhibited the viability of the human nasopharyngeal carcinoma cells (NPC-TW 01 and NPC-TW 04) in a time- and dose-dependent manner. Migration of cancer cells was also suppressed by PIRE. In addition, PIRE significantly increased the occurrence of the cells in sub-G1 phase and the extent of DNA fragmentation in a dose-dependent manner, which indicates that PIRE significantly increased apoptosis in NPC cells. The apoptotic process triggered by PIRE involved up-regulation of pro-apoptotic Bax protein and down-regulation of anti-apoptotic Bcl-2 protein, consequently increasing the ratios of Bax/Bcl-2 protein levels. Moreover, the p53 protein was up-regulated by PIRE in a concentration-dependent manner. Therefore, PIRE could induce the apoptosis-signaling pathway in NPC cells by activation of p53 and by regulation of apoptosis-related proteins.
Combinational Treatment of Curcumin and Quercetin against Gastric Cancer MGC-803 Cells in Vitro
Authors: Zhang Jian-Ye , Lin Min-Ting , Zhou Meng-Jia , Yi Tao , Tang Yi-Na , Tang Si-Li , Yang Zhi-Jun , Zhao Zhong-Zhen , Chen Hu-Biao
Published: June 2015

Gastric cancer remains a major health problem worldwide. Natural products, with stronger antitumor activity and fewer side effects, are potential candidates for pharmaceutical development as anticancer agents. In this study, quercetin and curcumin were chosen for testing and were applied separately and in combination to human gastric cancer MGC-803 cells. The MTT assay was used to evaluate cell growth inhibition. Annexin V-FITC/PI was carried out to measure apoptosis rate. Flow cytometry was performed to analyze mitochondrial membrane potential levels. Western blots were applied to detect expression of cytochrome c, total and phosphorylated ERK and AKT. Combined treatment with curcumin and quercetin resulted in significant inhibition of cell proliferation, accompanied by loss of mitochondrial membrane potential (ΔΨm), release of cytochrome c and decreased phosphorylation of AKT and ERK. These results indicate that the combination of curcumin and quercetin induces apoptosis through the mitochondrial pathway. Notably, effect of combined treatment with curcumin and quercetin on gastric cancer MGC-803 cells is stronger than that of individual treatment, indicating that curcumin and quercetin combinations have potential as anti-gastric cancer drugs for further development.
Le suréquipement commercial de l'Essonne (Essonne and its retail trade)
Authors: Griffisch François
Published: June 2015

Résumé. - De la difficile harmonie entre l'équipement commercial et son cadre géographique et urbain dans un département de la Grande Couronne. L'équipement commerce dépend à la fois de facteurs physiques, urbains et économiques. Ses caractéristiques résultent d'une évolution déjà ancienne, parfois récente. Le département de l'Essonne est marqué par un suréquipement commercial résultant d'une évolution récente. Fondé sur la méthodes des aires de chalandise, l'article analyse les causes et les conséquences du suréquipement et propose des solutions.
Comment lutter efficacement contre l'érosion dans les montagnes rifaines et telliennes (Ways of fighting efficiently against erosion in the mountains of Rif and Tell)
Authors: Fay Gérard
Published: June 2015

Résumé. - Montagnes telliennes et rifaines sont sites d'érosion accélérée en rapport avec la fragilité des milieux, mais plus encore avec la forte densité du peuplement, l'absence d'intensification agricole, les conflits autour de l'appropriation du domaine forestier. Les tentatives d'aménagement ont rarement réussi. Il leur faudrait passer par la responsabilisation des collectivités locales et par la reconversion des économies rurales.
Conséquences de l'incendie de forêt de l'été 1990 sur l'érosion mécanique des sols dans le Massif des Maures (Repercussions on physical soil erosion in the forests of the "Massif des Maures" following the fire of Summer 1990)
Authors: Martin Claude , Bernard-Allée Philippe , Béguin Eric , Levant Michèle , Quillard Jacques
Published: June 2015

Abstract. - The forest fire of august 1990, which burned a large area of the Real Collobrier Experimental Catchment, provided an opportunity to investigate post-fire hydrological, hydrochemical and mechanical erosion processes in a mediterranean forest ecosystem. This paper presents the effects of fire on soil erosion only. The first results, obtained during the hydrological year 1990-1991, pointed out a large increase of sediment delivery after fire.
L'urbanisation d'Anvers au XVIe siècle
Authors: Soly Hugo
Published: June 2015

Dans la première partie de ce texte, l'auteur met l'accent sur les conditions générales de l'urbanisation d'Anvers au XVIe siècle : l'explosion démographique, la croissance économique rapide, la montée d'une bourgeoisie opulente et la construction d'un nouveau système de défense. Ensuite, les activités de Gilbert van Schoonbeke sont analysées. Par la création de nombreux quartiers neufs, par l'urbanisation de la "Nouvelle Ville" (23 à 25 ha. annexés à la ville d'Anvers en 1542), par l'implantation de trois nouveaux marchés et par l'ouverture de 24 nouvelles rues (30% de toutes les artères tracées au XVIe siècle), ce grand homme d'affaires détermina l'aspect de la métropole jusqu'au XIXe siècle.

Deux facteurs permirent à Gilbert van Schoonbeke de réaliser des bénéfices énormes — un strict minimum de 60 000 florins, entre 1542 et 1550, soit 600 fois le salaire annuel d'un ouvrier qualifié. Ce spéculateur foncier n'a jamais entamé le lotissement sans avoir préalablement créé des centres commerciaux ou industriels qui allaient décider du développement futur de la zone concernée. En outre, il a toujours recherché et entretenu de bonnes relations avec des édiles corrompus, qui considéraient la transformation de la ville comme un excellent moyen de s'enrichir.
Les monuments sculptés du choeur de l'église de Folleville, XVIe siècle
Authors: Debrie Christine
Published: June 2015

De stilistische studie van de beeldgroepen in het koor van de kerk te Folleville (ten zuiden van Amiens) laat toe het uitzonderlijke belang te onderstrepen van het ensemble dat bestaat uit het grafmonument van Raoul de Lannoy,van zijn zoon François de Lannoy en van de zeer mooie graflegging in wit marmer die thans bewaard wordt in de kerk van Sint Jan te Joigny (Yonne). Deze beelden getuigen van de merkwaardige artistieke aktiviteit in Folleville in de eerste helft van de XVIde eeuw, toen Folleville een echt kunstcentrum was waar verschil- lende beeldhouwersateliers werkzaam waren. Nu vodr het eerst deze bijna op hetzelfde ogenblik ontstane beelden als geheel bestudeerd worden, kan men de voorname plaats die Folleville in de geschiedenis van de Franse kunst en de uitwisselingen met Italie bekleed heeft, aan het licht brengen. Folleville verschijnt als een belangrijke schakel in de verspreiding van de Italiaanse kunst in Frankrijk en op de weg die Italie met de zuidelijke Nederlanden verbindt, net als Amboise en Gaillon.
Les méandres de la politique polonaise de la France : août 1914-mars 1917
Authors: Bernard Dominique
Published: June 2015

Fondée sur des traditions séculaires, l'amitié franco-polonaise fut mise à l'épreuve des dures réalités de la première guerre mondiale. M. Dominique Bernard analyse les fluctuations de la diplomatie française prise entre les sentiments d'estime de la majeure partie de l'opinion et la nécessité de conserver l'alliance de la Russie tsariste. La déclaration du Grand- Duc Nicolas, du 14 août 1914, promettant à la Pologne à la paix, la renaissance de sa liberté, dans la religion, la langue et dans son autonomie, cette formule, ambiguë, convient au Quai d'Orsay, et non au peuple polonais qui aspire à l'indépendance. La politique française, guidée par le prudent ambassadeur Paléologue à Pétrograd, ne semble pas favoriser cette accession à l'indépendance dans la mesure où elle cherche tout l'appui militaire russe et la reconnaissance formelle de l'Alsace-Lorraine. Briand ira jusqu'à céder aux exigences russes, le 1 1 mars 1917. La révolution russe rendit à la France et aux autres Puissances de l'Entente la liberté d'intervenir sans restriction ni limite en faveur de la restauration de la Pologne.
Sur l'histoire des femmes en France
Authors: Perrot Michelle
Published: June 2015

De gesciedschrijving over vrouwen is in Frankrijk zeer recent. In dit artikel gaat Michelle Perrot in op de oorzaken van deze vertraging. Zonder naar volledigheid te streven vermeldt zij een aantal studiegebieden (familie, opvoeding, werk, vrouwenstrijd enz) en een aantal groepen, centra, tijdschriften die op universitair niveau deze beweging steunen. Men poogt de hedendaagse eigenheid van deze geschiedenis naar voor te brengen, alsook de objektieven en de beperkingen ervan, steeds in relatie met de plaats van de vrouw in de Franse gemeenschap.
La femme au village dans la région du Nord (XVIIe- XVIIIe siècles)
Authors: Muchembled Robert
Published: June 2015

In those three little villages of the Artois named Thélus, Neuville-Saint-Vaast, and Maroeuil, women of the interwar period still belong to the traditional rural society though precursory signs of change have appeared. Doomed to working, most often excluded from all sort of entertainment, women remain closely submitted to their husbands. Liberating work, symbol of feminine indépendance, remains totally unknown and the housewife represents an ideal yet seldom accessible. Two fields of activity mainly allow to grasp the work and professional lives of women, agriculture and cloth work ; three functions — feed the family, clothe it, look after the linen and the house — throw a light upon the housework and stress its importance.
Demain : les ouvrières et l'avenir au tournant du siècle
Authors: Rebérioux Madeleine
Published: June 2015

The weight of women in industry, and particularly in the textile and clothing manufactures, has justified for many years the interrogation underlying the title of this note, while the specific sides of women's salaried jobs and the difficulties one meets to gain access to their actual living conditions partly account for the difficulties of this exploration. The working women have produced neither a thorough representation nor a global vision of their future. But some of them have succeeded in thinking themselves as working women whereas others — more numerous — have laid the stress on new means of getting access to political decisions rather than to politics, all of them thus contributing to shape a new conception of the social move-' ment.
Des Maghrébines parmi nous : femmes et familles maghrébines aujourd'hui dans la communauté de Lille-Roubaix-Tourcoing
Authors: Mulette Brigitte
Published: June 2015

De immigratie uit de Maghreb is in het gebied Lille - Roubaix - Tourcoing niet onaanzienlijk (34 640 mensen op een totaal van 1 060 515 in 1975). Onze aandacht gaat naar het probleem van nun opname in de régionale ekonomie, hun moeilijke aanpassing in de industriele wereld, de kulturele en sociale handicap van de vrouwen en de kinderen. Deze bevolking die door onze wereld uitgestoten wordt kent immers heel wat problemen : huisvesting, onzeker werk, zware familielasten, weinig toekomstperspectief. Voor vrouwen en kinderen en adolescenten zijn deze problemen zeer duidelijk. Zij ondergaan de sen ok tussen twee culturen en worden verscheurd tussen twee manieren van denken en van I even. Hun zeer wettelijke aspiraties worden beperkt door detraditie die in de moslim familie heerst.
Contribution à la localisation de Quentovic ou la relance d'un vieux débat
Authors: Leman Pierre
Published: June 2015

Des travaux agricoles ont bouleversé le sol d'une ancienne prairie au lieu Vismaretz, durant le printemps de l'année 1981.

C'est en ces lieux que les historiens s'accordent à placer le port de Quentovic, sur la rive sud de la Canche entre Montreuil et Etaples dans le village de la Caloterie ; en se fondant sur les seuls textes et monnaies. Une observation des vestiges mis au jour par la charrue et la machine chargées du curage des fossés de drainage permet de conclure à l'existence d'une nécropole à inhumation. Les tombes orientées soit est-ouest soit nord-sud ont été creusées dans deux, voire trois niveaux d'occupation. Le matériel (tessons, os taillés, fibules, fragment d'inscriptions), autorise une datation comprise entre la fin du VIIe et le début du Xe siècle. Pour la première fois donc, un gisement archéologique de cette époque est découvert dans ces parages. En outre, deux tertres en cours d'arasement, d'un diamètre de trente mètres, marquent le relief de cette zone dont la superficie s'étend sur plus de deux hectares. Enfin, la coupe d'un chemin antique plusieurs fois rechargée a été relevée. Des prospections dans une parcelle voisine ont confirmé l'étendue du gisement vers la Canche. L'étude minutieuse des micros-reliefs, de la végétation fossile des haies d'enclos en fait une vaste zone tout à fait originale de ce secteur de la Canche. Il peut s'agir de la nécropole d'un village disparu mais les arguments en faveur d'un secteur de Quen- tovic sont maintenant trop nombreux pour ne pas ouvrir de vastes fouilles de contrôle dans ce sens.
Les fortifications médiévales de la ville du Quesnoy
Authors: Salamagne Alain
Published: June 2015

Si, du Quesnoy, petite cité du sud du département du Nord, les amateurs connaissent bien les hauts bastions de brique, par contre les états antérieurs de la fortification étaient restés jusqu'à ce jour totalement ignorés ; c'est donc l'évocation et la restitution de ceux-ci qui a été tentée. L'étude des enceintes urbaines apporte un éclairage à multiples facettes sur l'histoire économique et sociale tant de la cité que de l'entité géo-politique dans laquelle elle s'inscrit. Cependant un seul aspect de ce vaste programme de recherche a été ici retenu : la signification architecturale des fortifications médiévales du Quesnoy et leur place parmi les autres réalisations hainuyères.

Deux grandes campagnes de fortification ont pu être isolées en Hainaut : la première due, dans la seconde moitié du XIIe siècle, à la politique ambitieuse des comtes Baudouin IV et Baudouin V, dota leur comté d'une série de points forts, châteaux et villes emmurées, tenant le plat- pays. Dans le cadre de la guerre de Cent-Ans, une seconde campagne de fortifications vint au XIVe siècle amplifier et moderniser les données établies dès le XIIe siècle. Le Quesnoy, pour sa part, ayant participé aux deux était tout à fait représentatif de l'architecture militaire hainuyère et des innovations que ses maîtres-d'œuvre y tentèrent.
UML based Model of a Context Aware System
Authors: Mahmud Umar
Published: June 2015

Context Awareness is the mechanism through which systems can adapt to the needs of a user by monitoring the context. Context includes environment, spatial, temporal, etc information that is used to infer the current activity. UML is used to design a context aware system. The context aware system is viewed as an Object Oriented software product. The UML model is generated through ArgoUML, a free UML modelling tool. The Use Case Diagram, the Sequence Diagrams and the Class Diagram are modelled using this tool. The Class Diagram is subjected to CK metrics to identify the strengths and weaknesses of the design. The measurements show that the proposed model is within the recommended range.
A Marijuana Legalization Model Using Benefits, Opportunities, Costs and Risks (BOCR) Analysis
Authors: Saaty Thomas L.
Published: June 2015

Marijuana has been regarded as an evil in our society because of abuse and addiction. However, its legalization and use in several states have shown that from the standpoint of its benefits, opportunities, costs and risks (BOCR) the overall decision should be to legalize it in our greater society. This is an elementary application of the Analytic Hierarchy Process to analyze that decision that is now before Congress for action.
The Tribological Behavior of some Steel Samples Prepared by Powder Metallurgy Sintered in Microwave Field
Authors: Olei Adrian , Savu Sorin , Stefan Iulian
Published: June 2015

The objective of this research is to observe the influence of the sintering temperature on the wear testing for some steel samples elaborated by powder metallurgy technology. For obtaining the steels there were used iron powders and graphite powders. The powders were homogenized in a high energy ball mill Pulverisette 6, cold compacted and then sintered using a Muegge type microwave heating installation. The influence of the sintering technique on the samples’ wear behavior is studied using both a tribometer and a profilometer.
Modal Parameters Identification for some Sandwich Bars Reinforced with Fiber-Glass
Authors: Miriţoiu Cosmin Mihai , Stănescu Marius Marinel , Bolcu Dumitru , Burada Cristian Oliviu , Roşca Vîlcu , Rizescu Sabin Vasile
Published: June 2015

In this paper, there are built new composite bars with different core: with the core made of polypropylene honeycomb and polystyrene reinforced with fiber-glass. Starting from the theoretical background the modal parameters identification, there will be established an experimental method used to determine the eigenparameters of the sandwich bars. In the end, some comparisons between the eigenparameters will be made.
Influence of the Cutting Parameters on the Surface Roughness when Machining Hardened Steel with Ceramic and PCBN Cutting Tools
Authors: Benga Gabriel , Savu Danut , Olei Adrian
Published: June 2015

The paper presents the influence of various cutting regimes on the surface roughness, when a hardened bearing steel has been machined using both ceramic and PCBN cutting tools. There were used different cutting conditions varying cutting speed, feed rate and depth of cut in order to determine the influence of each cutting parameter on the surface finish.
Particle Size Distribution of the Coal Bottom Ash from the Large Combustion Plant
Authors: Ghermec Olimpia , Bucse Ionela Gabriela , Ciobanu Mariana
Published: June 2015

Human existence is dependent on the consumption of electricity and of thermal energy. One of the environmental problems is represented by the particulate matter with the diameter of less than 2.5 mm derived from combustion of coal. In order to find solutions to reduce emissions at source, the particle size distribution of the coal bottom ash after removing it from the steam boiler of the large combustion plant from Romag Halanga in Drobeta Turnu – Severin area was determined. Dry particle size distribution shows that the major fraction is one that has a particle size of 125 μm. Particle size distribution in the smallest size fraction was performed with laser diffraction particle size analyzer Brookhaven 90 Plus Nanoparticle Size Analyzer. Particle size distribution shows that in the composition of the coal bottom ash were found particles with nanometric dimensions.
Studies Regarding Identification and Assessment of Noise Generating Sources in Different Areas of Work
Authors: Ciobanu Mariana , Bucse Ionela Gabriela , Ghermec Christian
Published: June 2015

Occupational noise is a complex of sounds of different levels and pitches, with different characteristics (impulsive, pure, audible), rhythmic or nonrhythmic, produced continuously by machines, instruments, devices or discontinuously by vehicles, human voice, during occupational activity. Noise problem is more complex and from this point of view things are far from being good. ”Vladimir Spilda, Commissary for Social Affairs and Egual Chances: Noise effects are not limited only to lossing hearing, He can be causing workplace accidents and increasing stress level.” Noise can be source of risk of workplace accidents, work-related stress and combined with other risk factors at the work place can damage health in both the long and short term.
Study of the Emissions from the Fuel Distribution Stations in Drobeta Turnu Severin
Authors: Bucse Ionela Gabriela , Ghermec Olimpia , Gavrilescu Elena , Ciobanu Mariana
Published: June 2015

A major source of air pollution is represented by the means of transport. The largest share of gases polluting air comes from motor vehicles, mainly due to their large number. Regardless of the type of motor, vehicles pollutes air with carbon and nitrogen oxides, unburned hydrocarbons, sulphur oxides, aldehydes, plumbum, asbestos, soot, etc. But the activity of trading fuels (diesel, gasoline), lubricants, parts, accessories and auto cosmetics (which are sold in fuel sales and distribution units) is another source of environmental contamination. From this point of view we studied some gas stations located in Drobeta Turnu Severin area, the possibility of soil pollution, waste disposal, safety zone and fire security measures. Air emissions, wastewater discharge, safety and hygiene of jobs were also studied.
Considerations on the Use of RIS Records
Authors: Ghiba Mihai
Published: June 2015

This paper makes a comparative analysis of the data recorded and used in inland transport activity utlizand information that is recorded in "electronic ship reporting" and "Automatic Identification System" in the standard River Information Services - Vessel Traking and Tracing combined with those additionally recorded in the logbook and in the seafarer’s service book. RIS recordings largely make the database necessary for keeping the Logbook, and differences can be evaluated through a matrix. The concentrated data set can be used to determine the working time of seafarers and establishing the compliance with promotion requirements based on the training fully recorded, to accumulate data necessary for shaping risk functions, to clarify the conditions under which shipping accidents occurred, with results in the recovery of losses by marine insurance, to a thorough and accurate risk analysis.
Transhipment Simulators for Training of Ports′ Personnel
Authors: Haller Alexandra , Putz Lisa-Maria , Schauer Oliver
Published: June 2015

As the transhipment of goods is a major cost factor within multimodal transport there is high potential in optimizing transhipment processes at container terminals and thus to reduce transportation costs. One aspect thereby is to improve efficiency of ports ́ personnel, optionally by using port vehicle simulators for training. The paper ́s aim is to identify the demand for port-transcending vehicle simulator training at container terminals in the Danube Region and to examine the feasibility of its practical implementation. Results suggest high basic interest of container terminals in simulator training. Currently, simulators were mainly operated by crane and reach stacker (simulator) manufacturers. However, caused by the high technical and organizational expenses it is yet not possible or at least not profitable for container terminals itself to offer port-transcending simulator training.
Possible Applications and Potentials for LNG (Liquefied Natural Gas) in Central Europe
Authors: Simmer Laura , Pfoser Sarah , Aschauer Gerald , Schauer Oliver
Published: June 2015

In the current discussion about alternative energy supply and strategies in Europe, LNG comes to the fore. For the implementation of LNG in Central Europe, there are many hurdles to be overcome. With the “LNG Masterplan Rhine-Main-Danube”, a first step is being made to overcome these barriers. Within this Masterplan, a Framework and Market Analysis was conducted. Therefore, extensive literature research was carried out in a first step, to have a detailed analysis and assessment of the developments for the implementation and applications of LNG. The results of this paper should not only point to the problem areas, but to the potentials for LNG as well and make a significant contribution for further implementation steps.
Attitudes and Risks Concerning the Management of the Career of Young Engineers
Authors: Fleser Traian , Szuhanek Ranko , Binchiciu Emilia , Szuhanek Camelia
Published: June 2015

The quality of an academic educational system can be seen in the educational performances of students, but most of all in the way it ensures a professional career that is adequate to their studies. One can think of concepts as: education for a career, development, planning and management of the career, methods, instruments, strategies and techniques in the management of potential and implied risks. The characteristics of an education for a career in university training are presented in comparison to stages of one’s professional activity. The paper introduces the strategies for career management and techniques of making successful planning.
Studies Regarding Photovoltaic Solar Energy Potential on Pristol Area, Mehedinti County
Authors: Demian Gabriela , Demian Mihai , Bogdan Lizia
Published: June 2015

The paper makes an assessment of the long term solar resource for the location of a photovoltaic solar park in the Pristol, Mehedinti County, Romania. Reference data and observations in the proximity of the solar park location were limited, and the analysis was based on a Typical Meteorological Year (TMY) Meteonorm developed to represent the behavior of the solar resource at the site of Photovoltaic Solar Park. The level of Global Horizontal Irradiance (GHI) was evaluated as 1376 kWh/m2/year, while values for direct normal irradiance (DNI) and diffuse horizontal irradiance (DHI), the resulting values were 1553 kWh/m2/year and 606 kWh/m2/year, respectively, provided for long-term behavior.
Structural and Morphological Evaluation of 25% vol. Ni/Al2O3 Nanocomposite Powders Produced by Mechanical Milling
Authors: Voicu Cristina , Popa Florin , Pascuta Petru , Chicinaş Ionel
Published: June 2015

The evolution of the Al2O3/Ni (25% vol. Ni) composite powders, during the milling and the stability of the composite phases were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray microanalysis (EDX). SEM images show a high level of homogenization of the Ni and Al2O3 phases for milling times larger than 120 minutes. The X-ray study indicates no reaction between the two phases. The crystallite grain size decreases with the milling time for both phases.
The Influence of Barium Carbonate on the Tribological Characteristics of some Iron-Based Friction Composites
Authors: Merie Violeta , Cândea Viorel , Popa Catalin
Published: June 2015

New iron-based composite materials with addition of barium carbonate (2 to 8 wt% barium carbonate) for friction applications are investigated. The tribological behavior of the studied materials was determined by a pin-on-disk method when a cast iron disk was employed. The addition of 2 wt% barium carbonate determined a significant increase of the average friction coefficient. Instead a further increase of barium carbonate content determined a gradual decrease of this parameter. The improvement of wear resistance was marked out for a barium carbonate content of up to 6 wt%. The optimal ratio between the average friction coefficient and the wear rate for the researched Fe-Cu-graphite-Ni-BaCO3 composites was determined for the iron-based material containing 2 wt% barium carbonate. SEM, EDX and XRD analysis marked out a complex structure containing alloyed ferrite, pearlite and carbides, traces of nickel and barium carbonate and free graphite.
Smelting Steel Resistant to Corrosion from Metal Mixing Air in Late Oxygen Blowing
Authors: Gizatulin R.A. , Valueva A.V. , Valuev D.V. , Serikbol A.
Published: June 2015

The paper considers that the application in metallurgical enterprises-s mixing argon bath at the end of oxygen blowing in the smelting of corrosion-resistant steel has found wide application [1, 2]. However, the deficit-ness and the relatively high cost of argon, low pressure in his shop on line constrain most plants use argon at you-melting corrosion resistant steels. The article suggests that in-intensification of decarburization in the smelting of corrosion-resistant chromium-nickel steels in the 40-ton electric arc furnace use compressed air instead of argon.
New Technologies of Anodizing Components of Oil and Gas Industry Equipment Made of Aluminum Alloys
Authors: Kolenchin N.Ph. , Kuskov V.N. , Shadrina P.N.
Published: June 2015

The injection of ozone into the air mixture for a barbotage of electrolyte at anodization of an aluminum alloy D16 in 5 % aqueous solution of sulfuric acid increases final thickness of oxide coating by 45 - 53 %, and simultaneous ultrasonic affecting and bubbling of electrolyte by the ozone-aerial mixture - only on 30 - 35 %, however in the latter case microhardness and wear resistance of coating increase. The additional applying of vibration decreases thickness, microhardness and wear resistance of an oxide layer.
Elastic Properties of Solid Solutions with Intermediate Valence Sm1-xYxS
Authors: Soboleva E.G. , Igisheva A.L. , Krit T.B.
Published: June 2015

The given article considers acoustic analogues of elasticity theory ratios determining Poisson’s ratios of Sm1-xYxS alloy by their elastic parameters. The article discusses behavior of sound velocities, elastic moduli, Poisson’s ratios, Grüneisen parameter and brittleness-plasticity criterion ratios depending on the concentration of alloy components including valence transition from semiconductors into the metal phase.
Formation of Nano-Sized Structural-Phase States in Surface Layers of a Cermet Alloy and the Influence of the States on the Tool Life of Cermet Plates in Metal Cutting
Authors: Ovcharenko V.E. , Ivanov Yuriy F. , Mohovikov A.A. , Ignatyev A.S. , Baohai Yu , Zhang Hong Wei
Published: June 2015

A comparative analysis of the surface-layer microstructure of a tungsten-based cermet alloy modified with pulsed high-energy electron beams generated by gas-discharge plasmas and of the tool life of metal-cutting plates prepared from this alloy is performed. The choice of a plasma-forming gas providing for the emission of electrons out of the plasma-filled cathode is shown to have a profound influence both on the formation process of nanosized structural-phase states in the surface layer of the cermet alloy and on the tool life of the metal-cutting plates prepared from this alloy.
Application of Natural Barium-Stroncium Containing Material for Steel Treatment
Authors: Platonov M.A. , Sulimova I.S. , Rozhikhina Irina D.
Published: June 2015

The paper considers carbon, silicon and aluminum reduction of barium and strontium from natural materials by thermodynamic modeling in conditions of out-of-furnace steel treatment. X-rays phase and differential thermal methods of analysis were applied to investigate the samples of natural barium and strontium containing material. A process flowsheet of steel treatment by barium-strontium modifier in induction furnace was developed on the basis of carried out research.
Fiber-Reinforced Composites in Rapid Prototyping Technologies
Authors: Saprykin A.A. , Babakova E.V. , Ibragimov E.A.
Published: June 2015

In a modern market economy, rapidly developing production requires a significant reduction of term for development and production of new products, ensuring competitiveness and growth of technical and economic performance while minimizing costs. This led to the idea of using rapid prototyping technology which today is focused on the use of composites. This paper gives a brief description of composites formed using the basic processes of rapid prototyping. The main attention is directed to the methods of forming fiber-reinforced composites.
Investigation of High-Strength and Heat-Proof Added Metal Characteristics with Thermal Microscopy Facilities
Authors: Malushin N.N. , Valuev D.V. , Osetkovskiy Vasiliy L. , Valueva A.V. , Serikbol A. , Penkov A.I.
Published: June 2015

The paper demonstrates that indirect testing performed with thermal microscopy facilities can be used successfully to study the properties of heat-resistant added metal.
Experimental Study of Plastic Deformation Intensity in Cutting Zone
Authors: Proskokov A.V. , Filippov A.V. , Gorbatenko V.V.
Published: June 2015

The paper considers the intensity degree of a plastic shear deformation ei when cutting, the results of experimental studies that determine a travel trajectory of a cutting material layer through a plastic deformation zone in a chipping area and comparative analysis of deformation conditions of a sample material machined by various tool rake angles (γ=0o and γ=15o).
Influence of Layer Laser Sintering on Quality of Surface Layer Sintered Aluminum Powder PA-4
Authors: Saprykina N.A. , Saprykin A.A. , Borovikov Ivan F.
Published: June 2015

The results of experimental studies of the influence of technological regimes of laser irradiation on the thickness of the surface layer of the sintered aluminum powder PA-4. The basic mode settings that affect the quality of the sintered surface layer - laser power, scanning speed and move the laser beam powder layer. The limits of variation of the thickness of the sintered layer from 0.74 to 1.55 mm by changing the technological conditions of laser processing.
Interval Objects and Operations in Deformable Solid Mechanics Problems
Authors: Boyarshinov M.G.
Published: June 2015

Interval vectors and tensors are determining as objects which are invariance under transformation of the coordinates system. For illustrations, interval scalars, vectors, and tensors are used in solving the simplest problems of deformable solid mechanics to construct distributions of displacements, strains, and stresses.
Design of Straight Tooth Profile for Fine-Module Ratchet Teeth
Authors: Sharkov Oleg V. , Koryagin Sergey I. , Velikanov Nikolay L.
Published: June 2015

Determination of geometrical parameters of theoretical tooth profile for fine-module ratchet tooth in which the contacting surfaces of the teeth are formed by the straight segments is considered in this paper. The design scheme and equations for determination of the main geometrical parameters of the proposed straight tooth profile are obtained. The effect of module and gradient angle on the theoretical length of teeth straight working surfaces is investigated. The proposed straight tooth profile allows to increase the load capacity and manufacturability of ratchet tooth.
Research of Hardalloyed Burnishing Tool Durability with Coatings by Ion-Plasmous Sputtering Method
Authors: Bobrovskij I.N. , Grigoriev S.N. , Melnikov P.A. , Bobrovskij N.M.
Published: June 2015

In this paper the effect of different types of coatings on durability increase of the tool for surface plastic deformation is considered. Wide burnishing processing with coated tool was selected as such research was performed for the first time. The influence of the type of coating on the tool durability has been explored.
A Change in Mechanical Behavior of Safety Fluid Couplings when the Lockup Device is Used in its Construction
Authors: Koperchuk Аlexandr V. , Murin A.V. , Dortman A.A. , Filonov V.V.
Published: June 2015

The article describes the version of safety fluid couplings where synchronization is ensured by using the lockup device with steel balls. The ways to increase the load capacity of the lockup device are considered. The mechanical behavior of the safety fluid coupling with the lockup device used for synchronizing has been parameterized in the course of experiments.
Parameters of Contact Interaction while Lathing with Straight-Edge and Radius Cutters
Authors: Filippov A.V. , Filippova E.O.
Published: June 2015

The article discusses contact interaction of the straight-edge or radius cutter with the workpiece. Parameters under investigation are as follows: geometry in a setting system, the cutting edge length and a cross section of the shear layer. The description of the main features of the straight-edge cutters is given. Characteristic curves of parameters under investigation are presented. Guidelines for choosing of cutting tools are offered on the basis of the data obtained.
Resilience Tests of Milling Cutters with Constructive Feed
Authors: Simankin Fedor , Protasyev V.B. , Simankin A.F. , Botova A.L.
Published: June 2015

The technique and results of resilience tests of mills for processing small-size periodic profiles with different schemes forming the profile of the cutting edge - with full-profile and constructive feed are represented. Practical recommendations for the use of cutting parameters for tools with constructive feed are given.
Application of Inorganic Nanopowders in Welding, Surfacing and Spraying (Review)
Authors: Lukashov A.S. , Zernin Evgeniy A. , Kuznetsov M.A.
Published: June 2015

The paper reviews research works on nanoincorporated consumables for welding, surfacing and spraying. Use of metal and compound nanoparticles is considered such as tungsten carbide, tungsten-cobalt carbide, chromium carbide, titanium carbonitride, aluminum oxide and others. It has been proved that inoculation of nanopowders results in modification of metal structure and improves service performance of weld joints.
Microsilica as a Modifying Component in Fired Ceramics
Authors: Torosyan V.F. , Gorlov D.S.
Published: June 2015

The principal directions in the development of construction material industry include expansion of raw material sources, quality improvement of raw materials subjected to preliminary treatment, application of modifying components, constructive and technological modernization of manufacturing process. Manufacturing of ceramic bricks is one that dominates this industry. We know that there isn’t enough conditional clay suitable for ceramics production in most East regions of Russia and West Siberia. However, in many regions there are powerful heat power plants and highly-developed metallurgical enterprises, which produce sideline products alongside with basic output. The issue of complex utilization of wastes produced by power engineering and metallurgy has not been successfully resolved yet. Slag and other silica-containing sideline products of main production have not practically been used to the full. Nevertheless, it’s necessary to note, that disperse condition of silica-containing wastes as well as their physical and chemical characteristics predetermine prospective application of silica-containing materials in ceramics.
Influence of Preliminary Deformation on Micromechanisms of Failure of Offshore Gas Pipeline Material
Authors: Maruschak Pavlo , Danyliuk Iryna , Poberezhnyi Lyubomyr , Pyrig Taras , Panin Sergey
Published: June 2015

The S and J - methods of pipe laying tend to increase the brittle fracture component in the material, however, they have practically no effect on the residual life-time of metal under low amplitude cyclic loading (260 MPa). An increase in the stress range up to 320 MPa enhances the negative effect of preloading, which is more pronounced in case of using the S - method of pipe laying as compared to the J - one. Within the high amplitude range (420 MPa) the process of preliminary deformation causes the activation of relaxation processes and longitudinal splitting in the material, giving rise to an abnormal increase in the cyclic life of the plastically deformed material.
The Process Model of Diesel Engines in Low-Pressure Channels under the Conditions of Subzero Temperature
Authors: Syrbakov A.P. , Korchuganova M.A. , Kapustin А.A.
Published: June 2015

The conditions have been considered of the environmental effect on the working efficiency of fuel feed system of diesel engines in wintertime. A scheme has been suggested of thermodynamic state of diesel fuel oil in structural components of the fuel feed system of energy-saturated tractors affected by environmental conditions. There is a mathematical description of the temperature changing process in the fuel tank depending on the environmental temperature provided in the study.
Providing of High Longevity of Operating Parts of Small-Scale Machinery in Agriculture
Authors: Chernysh A.P. , Korchuganova M.A. , Syrbakov A.P. , Burunov A.I.
Published: June 2015

The author of the article considers the scientific approaches to increasing the longevity of high-loaded operating parts of small agricultural machines by forming the technological repair units when choosing the optimal methods of hardening the functional surfaces with anti-wear low-cost material.
Operating Mode Simulation of the Micro HPP Hydro-Generator
Authors: Lukutin Boris V. , Sandarova E.B. , Matukhin D.L. , Fuks I.L.
Published: June 2015

In the paper operating mode simulation of a hydro-generator with armature winding taps, running under standalone load with thyristor auto ballast stabilization system of magnitude and frequency of the output voltage of a hydraulic unit has been conducted. The created model enabled to investigate steady-state operation of the plant when connecting ballast load to various winding taps of the hydraulic generator subject to power change of the plant workload. Stabilization of the magnitude and phase of hydro-generator equivalent load as well as the distortion degree of output voltage for each stage of ballast have been evaluated. Ballast stage control algorithm and control laws of gate switching angles of ballast regulator have been proposed. Studies were undertaken within the scope of the RFBR grant entitled “Research and development of micro hydro power plant control systems for the power supply of standalone consumers”.