Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-05-05T12:24:43Z No. of bitstreams: 1 vivianespiritosantomassipaschoalino.pdf: 3537602 bytes, checksum: bc4534be6df769875e1988bea359c413 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-06-07T15:37:36Z (GMT) No. of bitstreams: 1 vivianespiritosantomassipaschoalino.pdf: 3537602 bytes, checksum: bc4534be6df769875e1988bea359c413 (MD5) / Made available in DSpace on 2016-06-07T15:37:36Z (GMT). No. of bitstreams: 1 vivianespiritosantomassipaschoalino.pdf: 3537602 bytes, checksum: bc4534be6df769875e1988bea359c413 (MD5) Previous issue date: 2014-08-27 / FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais / Este estudo avaliou a molhabilidade, a morfologia superficial e a influência da ciclagem térmica sobre a resistência de união entre um cimento resinoso e uma cerâmica de zircônia estabilizada por ítrio (Y-TZP) submetida a diferentes protocolos de jateamento. Foram confeccionados 35 discos (diâmetro: 15mm, espessura: 2mm) cerâmicos sinterizados LAVA All-Ceramic System (3M Espe – Seefeld - Alemanha). Os discos foram divididos randomicamente (n=5): A45 - jateamento AL2O3 45μm; A80 - jateamento AL2O3 80μm; C30 - jateamento AL2O3 revestido por SiO2 30μm (Cojet); R30 - Jateamento AL2O3 revestido por SiO2 30μm (Rocatec Soft);R110 - jateamento AL2O3 revestido por SiO2 110μm (Rocatec Plus); R110R30 - R110 + R30; ST - sem tratamento. O jateamento foi realizado de forma padronizada a pressão constante de 2,5bars, distância de 10mm, em movimentos circulares durante 90s. Para o teste de cisalhamento com e sem ciclagem (n=10) sobre o disco cerâmico já fixado no cilindro de resina acrílica foram colocados com cera utilidade quatro matrizes transparentes cilíndricas (Tygon tubing, TYG-030, Saint-Gobain PerformancePlastic, Maime Lakes, FL, EUA – 3 mm de diâmetro interno por 3 mm de altura). As superfícies cerâmicas foram silanizadas por 60s (Monobond S-Ivoclar-Vivadent- Schaan-Liechtenstein) com microbrush (Vigodent, Rio de Janeiro,RJ, Brasil) internamente ao tygon tubing na zircônia de forma ativa por 60s, e realizada a secagem com leve jato de ar por 20 segundos. Foram preenchidas com cimento resinoso Panavia F®(Kuraray, Okayama, Japão) com o auxílio de uma seringa centrix com ponta (Accudose agulha) (Polidental Ind. e Com. Ltda- São Paulo- SP, Brasil). A fotopolimerização foi realizada com o LED Radii-Cal (SDI-Pinheiros-SP,Brasil) com intensidade de 1200mW/cm e tempo de polimerização de 40 segundos. Após, armazenadas em água destilada na estufa (Olidef- Ribeirão Preto - São Paulo-Brasil), à 37ºC durante 24 horas, as matrizes foram removidas com o auxílio de lâminas de bisturi número 12 (Becton Dickinson-New Jersey -EUA). Depois deste período metade das amostras foram submetidas a 3.000 ciclos de termociclagem em uma cicladora Térmica (Ética Equipamento Científicos S/A- São Paulo- Brasil). A outra metade, posteriormente foi levada ao ensaio de cisalhamento (EMIC-DL 2000 - São José dos Pinhais, Paraná). Para análise estatística utilizaram-se os testes ANOVA (dois fatores) e Tukey (α=0,05). Em seguida, a superfície fraturada foi inspecionada em estereomicroscópio (Discovery.V20, Carl Zeiss, LLC, EUA), (n=2) com magnificação de 9X. O modo de fratura foi classificado em três tipos diferentes: Adesiva, Mista e Coesiva. Dois discos a mais de cada grupo (n=2) tiveram suas superfícies jateadas e foram observadas (2000x) em Microscópio Eletrônico de Varredura FEI INSPECT S50 (Brno, República Tcheca). O ângulo de contato foi mensurado por goniometria (Rame-Hart, INC., 100-00, Contact Angle Goniometers - Montain Lakes – EUA)(n=5) em cada amostra, antes e após o protocolo de jateamento. Uma gota de água destilada foi colocada sobre a superfície cerâmica com uma seringa e o ângulo de contato foi medido durante 20 segundos (30 Frames por segundo). Para análise estatística utilizou-se os testes ANOVA (um fator) e Tukey (α=0,05). Observou-se que na ausência da ciclagem térmica, o tratamento de superfície não influenciou na resistência de união (p=0,238). Grupo A80(12,42±4,08); A45(14,38±4,95); C30(16,86±4,53); R30(13,99±5,55); R110(14,02±5,03); R110R30(11,75±4,19); ST(10,57±4,10). A ciclagem térmica influenciou os valores de resistência de união de todos os grupos (p=0,399). Os maiores valores de resistência de união após ciclagem térmica foram obtidos para os grupos A80 (4,927bc±1,53) e R110 (7,175bc±1,34), em comparação com os grupos ST 11 (1,86e±0,30), C30 (2,132e±0,73) e R110R30 (3,251de±1,37). Para todas as amostras analisadas as falhas foram consideradas adesivas. As fotomicrografias ilustram superfícies mais homogêneas para os grupos que apresentaram menores ângulos C30 (62,6;de±0,91), R30 (61,91e±1,05) e R110R30 (61,54e±1,02). O jateamento influenciou estatisticamente no valor do ângulo de contato, onde o grupo ST (110,61a±0,90) apresentou maior ângulo e os grupos R110R30 (61,54e±1,02), R30 (61,91e±1,05), C30 (62,66de±0,91) e A45 (65,50d±0,94) apresentaram os menores ângulos respectivamente. Conclui-se que o jateamento com C30, R30 e R110R30 proporcionaram maior molhabilidade de superfície da cerâmica estudada. Os maiores valores de resistência de união foram para os grupos onde se realizou jateamento com óxido de alumínio 80μm e com Rocatec 110 μm. Apesar dessa união não ser durável. Partículas maiores apesar de causarem maiores danos a superfície cerâmica, produzem valores de resistência de união altos. O protocolo de jateamento de silicatização com partículas maiores foi o tratamento que promoveu ao mesmo tempo maior molhabilidade e maior resistência de união. / This study evaluated the wettability, surface morphology and the influence of thermocycling on the bond strength of a resin cement and a zirconia ceramic stabilized by yttrium (Y-TZP) under different blasting protocols. Were made 35 discs (diameter: 15mm, thickness: 2 mm) sintered ceramic LAVA All-Ceramic System (3M Espe - Seefeld - Germany). The discs were randomly divided (n = 5): A45 - blasting Al2O3 45μm; A80 - blasting Al2O3 80μm; C30 - blasting Al2O3 coated SiO2 30μm (Cojet); R30 - Blasting Al2O3 coated SiO2 30μm (Rocatec Soft); R110 - blasting Al2O3 coated SiO2 110μm (Rocatec Plus); R110R30 - R110 + R30; ST - untreated. The blast was standardized in the constant pressure 2,5bars, distance 10mm, circular motion during 90s. For the shear test with and without cycling (n = 10) on the ceramic disc already fixed in the cylinder of acrylic resin were placed with wax utility four cylindrical transparent matrices (Tygon tubing, TYG-030, Saint-Gobain PerformancePlastic, Maime Lakes, FL, USA - 3 mm internal diameter by 3 mm height). The ceramic surfaces were silanized for 60 seconds (Monobond S-Ivoclar-Vivadent- Schaan-Liechtenstein) with microbrush (Vigodent, Rio de Janeiro, RJ, Brazil) internally to tygon tubing in zirconia actively for 60 seconds, and held drying with light air jet for 20 seconds. Were filled with Panavia F ® (Kuraray, Okayama, Japan) with the aid of a syringe with tip centrix (AccuDose needle) (Polidental Ind. E Com. Ltda- São Paulo-SP, Brazil). The curing was performed with the LED-Cal Radii (SDI-Pine-SP, Brazil) with an intensity of 1200mW / cm and polymerization time of 40 seconds. After stored in distilled water in the oven (Olidef- Ribeirão Preto - São Paulo-Brazil), at 37 ° C for 24 hours, the arrays were removed with the help of number 12 scalpel blades (Becton Dickinson-New Jersey-US). After this period half of the samples were subjected to 3,000 cycles of thermal cycling in a thermal cycler (Ethics Scientific Equipment S / Sao Paulo-A- Brazil). The other half, was later taken to the shear test (EMIC DL-2000 - São José dos Pinhais, Paraná). For statistical analysis we used the ANOVA (two factors) and Tukey (α = 0.05). Then the fractured surface was inspected in stereo (Discovery.V20, Carl Zeiss, LLC, USA) (n = 2) with magnification 9X. The fracture mode was classified into three different types: Adhesive, Mixed and Cohesive. Two discs over each group (n = 2) had their blasted surfaces and observed (2000x) in Scanning Electron Microscope FEI INSPECT S50 (Brno, Czech Republic). The contact angle was measured by goniometer (Rame-Hart, Inc., 100-00, Contact Angle Goniometers -. Montain Lakes - USA) (n = 5) in each sample before and after blasting protocol. A drop of distilled water was placed on the ceramic surface with a syringe and the contact angle was measured 20 seconds (30 frames per second). Statistical analysis was performed using ANOVA (one factor) and Tukey (α = 0.05). It was observed that in the absence of thermal cycling, the surface treatment did not influence the bond strength (p = 0.238). A80 group (12.42 ± 4.08); A45 (14.38 ± 4.95); C30 (16.86 ± 4.53); R30 (13.99 ± 5.55); R110 (14.02 ± 5.03); R110R30 (11.75 ± 4.19); ST (10.57 ± 4.10). Thermocycling influence the bond strength values of all the groups (p = 0.399). The higher bond strength values were obtained after thermocycling for the A80 groups (4,927bc ± 1.53) and R110 (7,175bc ± 1.34) compared with the ST group (1,86e ± 0.30) , C30 (2,132e ± 0.73) and R110R30 (3,251de ± 1.37). For all the samples analyzed were considered failures adhesive. The photomicrographs illustrate more homogeneous surfaces for the groups with smaller angles C30 (62.6; of ± 0.91), R30 (61,91e ± 1.05) and R110R30 (61,54e ± 1.02). The blasting statistically influence the value of the contact angle, where the ST group (110,61a ± 0.90) had a higher 13 angle and R110R30 groups (1.02 ± 61,54e), R30 (61,91e ± 1.05 ), C30 (62,66de ± 0.91) and A45 (65,50d ± 0.94) had the lowest angles respectively. It follows that the blasting C30, R30 and R110R30 provided higher wettability of the surface of the studied ceramics. The highest bond strength values were for the groups where they underwent blasting with aluminum oxide 80μm and Rocatec 110 microns. Despite this union will not be durable. Although larger particles causing greater damage to the ceramic surface, produce higher bond strength values. The silica coating blasting protocol with larger particles was the treatment that promoted while higher wettability and higher bond strength.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This study aimed to evaluate the effects of dentin pretreatment and temperature on the bond strength of a universal adhesive system to dentin. Ninety-six extracted non-carious human third molars were randomly divided into 12 groups (n=8) according to Scotchbond Universal Adhesive (SbU) applied in self-etch (SE) and total-etch (TE) mode, adhesive temperature (20ºC or 37ºC) and sodium bicarbonate or aluminum oxide air abrasion. After composite build up, bonded sticks with cross-sectional area of 1 mm² were obtained to evaluate the microtensile bond strength (μTBS). The specimens were tested at a crosshead speed of 0.5 mm/min on a universal testing machine until failure. Fractured specimens were analyzed under stereomicroscope to determine the failure patterns in adhesive, cohesive (dentin or resin) and mixed fractures. The microtensile bond strength data was analyzed using to two-way ANOVA and Tukey s test (p<0.01). Interaction between treatment and temperature was statistically significant to SbU applied in SE technique. Both dentin treatments showed higher bond strength to TE mode, regardless of adhesive temperature. When compared to control group, sodium bicarbonate increased bond strength of SbU in SE mode. Adhesive temperature did not significantly affect the μTBS of tested groups. Predominantly, adhesive failure was observed for all groups. Thus, the dentin pretreatment may be an alternative to improve the adhesive properties of the Scotchbond Universal adhesive system. / O presente estudo avaliou os efeitos do jateamento de partículas abrasivas e da temperatura sobre a resistência adesiva de um sistema adesivo universal à dentina. Utilizou-se 96 terceiros molares humanos hígidos e extraídos, divididos aleatoriamente em 12 grupos (n=8) de acordo com o adesivo Scotchbond Universal (SBU) aplicado no modo autocondicionante (SE) ou condicionamento ácido total (TE), temperatura do adesivo (20ºC ou 37ºC) e jateamento da dentina com partículas de óxido de alumínio ou bicarbonato de sódio. Após a realização das restaurações, foram obtidos espécimes em forma de palito com área seccional de 1 mm² para avaliar a resistência adesiva através do teste de microtração. O teste foi realizado em uma máquina de ensaio universal, a uma velocidade de 0,5 mm/min até a fratura ocorrer. As fraturas foram analisadas sob estereomicroscopia para classificar as falhas em adesiva, coesiva (resina ou dentina) e mista. Os dados foram submetidos ao teste ANOVA a dois fatores e ao teste de Tukey. A interação entre tratamento e temperatura foi estatisticamente significante (p<0,01) para SBU SE. Ambos os tratamentos da dentina resultaram em valores maiores de resistência adesiva para SBU no modo TE, independente da temperatura do adesivo. Já para SBU aplicado na técnica autocondicionante, apenas o jateamento com bicarbonato de sódio foi significativamente diferente quando comparado ao grupo que não recebeu tratamento. O adesivo aquecido não teve influência significativa sobre a resistência adesiva à microtração, para todos os grupos testados. As fraturas adesivas foram predominantes para todos os grupos. Dessa forma, o pré-tratamento dentinário pode ser uma alternativa para melhorar as propriedades adesivas do sistema adesivo Scotchbond Universal.

The blue duiker, Philantomba monticola and common or grey duiker, Sylvicapra grimmia represent two of the three duiker genera as well as two of the three species occurring in Southern Africa. The two species have not been adequately studied in their habitats within the Eastern Cape Province of South Africa, and this thesis centres around their biology with focus on diet and dental microwear. Faecal analysis was used to study the diet of blue duiker at Salem in the Albany district, and of common duiker on two farms, one a predominantly cattle farm at Kasouga and the other a farm for cultivation of chicory at Grants valley, both in the Bathurst district. The validity of faecal analysis was reviewed, and its applicability to blue and common duiker assessed. The method was appropriate for diet analysis of both species, as the common duiker is shy and secretive and the blue duiker is a rare and protected species which does not habituate readily. Results showed that the blue duiker was mainly folivorous with a seasonally stable diet of 79 percent dicot foliage and only 17 percent fruit. Common duiker diet at both study sites comprised mostly dicot foliage, with only two monocotyledonous plant species. Twenty-seven and nineteen plant species were identified in the diets of common duiker at Kasouga and Grants valley respectively and the annual percentage occurrences of dicot foliage in the diets were about 99 percent at both study sites. The predominantly browsing common duiker, therefore offered negligible competition for food resources to the grazing cattle on Kasouga farm. Both blue and common duiker fed selectively, with approximately one third of the total number of plant species identified in their diets providing at least 50 percent of the food eaten annually. Ehretia rigida was the most important plant species in the diets of both duiker species. Chicory, Chichorium intybus provided more than one third (35.6 percent) of the winter diet and a substantial proportion (14.4 percent) of the spring diet of common duiker at Grants valley, thereby confirming earlier reports of this species feeding on chicory and other cultivated crops. The diet of common duiker at Kasouga did not vary seasonally but that of common duiker at Grants valley did vary and this was attributed to utilisation of chicory. Results from the dental microwear analyses did not show any significant differences in dental microwear between blue and common duiker, but supported and confirmed that the two were browsing species, characterised by many pits and few scratches on their dental surfaces. A high incidence of pits was found on the dental surfaces of both duiker species, and was attributed to utilisation of fruit in the diet.

Objective: The goal of the present study was to investigate the effect of chairside surface treatments on biaxial flexural strength and subsurface damage of monolithic zirconia ceramics. Methods: Specimens (15x15x1.2 mm3) were prepared by sectioning from commercially available zirconia blanks (BruxZirTM) and sintering according to manufacturer's recommendations. Fully dense specimens were randomly divided into five groups (n=30) and treated as follows; 1) as-sintered (AS) 2) air abraded with 50 μm alumina fine particles (AAF), 3) air abraded with 250 μm coarse alumina particles (AAC), 4) ground (G), and 5) ground and polished (GP) to mimic chairside and dental laboratory treatments. Microstructural changes were thoroughly characterized by optical and scanning electron microscopy, surface profilometry and atomic force microscopy. Crystalline phases and their depth profile were investigated by x-ray diffraction (XRD) and grazing incidence x-ray diffraction (GIXRD). Results were analyzed by Kruskal-Wallis test and Tukey's adjustment for multiple comparisons. A 0.05 level of significance was used. Reliability was evaluated by Weibull analysis. Results: All treatment groups exhibited a significant difference in mean surface roughness (Rq) compared to the as-sintered group (p<0.05). The AAC group showed the highest surface roughness at 1.08 ± 0.17 μm, followed by the G, AAF and AS groups. The GP group exhibited the lowest surface roughness. The group air abraded with fine particles showed the highest mean biaxial flexural strength (1662.62 ± 202.58 MPa), but was not different from the ground and polished group (1567.19 ± 209.76 MPa). The groups air abraded with coarse particles or ground with diamond bur exhibited comparable mean biaxial flexural strength at 1371.37 ±147.62 MPa and 1356.98 ±196.77 MPa, respectively. The as-sintered group had the lowest mean biaxial flexural strength at 1202.29 ±141.92 MPa. The depth of compressive stress layer, measured by GIXRD was approximately 50 μm in the AAF group, followed by the AAC group with ~35 μm, ~10 μm for the ground group and ~5 μm for the ground and polished group. Deep subsurface cracks were observed in the AAC group (~80 μm in depth) and G group (~25 μm in depth), whereas shallower flaws were present in the AAF and GP groups at 10 and 3 μm, respectively. Weibull analysis represented a greater reliability in zirconia specimens treated with air abrasion groups. Conclusions: Surface treatments induced the t-m transformation in 3Y-TZP and associated development of compressive stresses to a depth that varied with the severity of the treatment performed. GIXRD revealed that AAF led to the thickest compressive stress layer, followed by AAC, G and GP. SEM revealed that subsurface damage was most severe with AAC, followed by G, AAF and GP. We propose that the flexural strength results can be explained by the difference between the depth of the compressive stress layer induced by the transformation and the depth of the subsurface flaws.

The diploma thesis deals with the assessment of the condition of the bank area of the flooded gravel sand pit Hulín, the subsequent design of active anti-abrasion structures and the determination of the point of maximum retreat of the bank line. As part of the assessment, a personal field trip was carried out, during which, in agreement with the supervisor, a shore section was designated for the subsequent proposal of a stabilization measure and its photo documentation. From the data provided by the supervisor, the characteristics of the waves, the starting length of the wind, the level of the heel of the highest abrasive log house were calculated and the point of maximum retreat of the shoreline in the focused transverse profile of the solved section was determined graphically. Part of the diploma thesis is the design of a total of six active anti-abrasive structures, the construction of which will prevent further retreat of the shoreline and support the creation of a habitat for local animals.

FŇUKALOVÁ VERONIKA: Comparison of MAG and plasma welding. My master´s thesis describes questions of welding of high-firmed and high-abrasion resistant steels with welding processes MAG (Metal Active Gas) and plasma. The weldability of CREUSABRO 8000 steel was passed judgement on, based on literary study of high-abrasion resistant steel question. The technology, characteristics of welding, kind of additional material were proposed. Tensile tests, brittleness tests for determination of strength characteristics and hardness tests of welding joints were implemented and analyzed experimentally. Further were analyzed macrostructure and microstructure. Other alternatives of high-firmed and abrasion resistant steels are part of my master’s thesis.

Diploma thesis studies the layers created by laser cladding and method of testing abrasion resistance of these layers using the method of dynamic shock impactor. In the theoretical part describes laser technologies and their applications, hardness testing and methods of testing of coatings. Proposed by the mechanical testing of the selected materials were carried out and evaluated in the experimental part. The conclusion summarizes final results of the experiment.

This work deals with the use of waste materials in the development of new industrial floors. The main task of this work is to choose a suitable waste materials, and design a new material using such materials, while achieving the required physico-mechanical properties. The aim of this work is also to verify the effects of process application, suitable microfiller and final coat and propose a suitable alternative industrial floors, which would not only be in terms of economic efficiency, but also in terms of ecological suitable replacement for commercial products.

Orientador: Osmir Batista Oliveira Junior / Resumo: O objetivo desse estudo clínico foi comparar o desempenho clínico e o impacto psicossocial causados por um novo dentifrício (GW) com propriedades clareadoras dadas por partículas abrasivas otimizadas, colorante de efeito óptico e agente dessensibilizante, com um dentifricio tradicional (GC). Métodos: Participaram deste estudo 120 voluntários que foram randomicamente distribuídos nos dois grupos experimentais: GC e GW. O desempenho foi avaliado pelas variáveis dependentes: efeito branqueador, efeito dessensibilizante e efeito colateral, enquanto o impacto psicossocial foi avaliado em quatro dimensões: autoconfiança dental, impacto psicológico, impacto social e preocupação com a estética dental. Na primeira consulta, cada voluntário recebeu um kiy de higiene bucal contendo escova e fio dental e um tubo de dentifricio, e foram orientados a fazerem uso do respectivo dentifricio 3 vezes ao dia durante 30 dias. A avaliação visual foi feita subjetivamente com auxilio da escala Vita Classical e com uso de espectrofotômetro de reflectância (Vita Easy shade) respectivamente. O efeito dessensibilizante foi dado a partir da resposta dolorosa, utilizando uma escala EVA,variando de 0 a 10. Os efeitos colaterais foram dados a partir do preenchimento de uma ficha contendo os possíveis efeitos. O impacto psicoemocional foi determinado com uso do Questionário de Impacto Psicossocial da. Estética Dental (PIDAQ). A eficácia, sensibilidade dentária e efeitos colaterais foram avaliados no baseline... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This clinical trial compared the clinical efficacy and psychosocial impact of a novel whitening dentifrice (GW) containing optical pigment, optimized abrasive silica and desensitizing agent with a conventional toothpaste (GC). Methods: 120 volunteers were randomly divided into GW and GC. The clinical efficacy was evaluated by the dependent variable: whitening efficacy, tooth sensitivity and side effect, while the psychosocial impact was measured in four dimensions: dental self-confidence, psychological impact, social impact and concern with dental aesthetics. They received a kit containing a toothpaste, toothbrush and dental floss, and were instructed to use the respective dentifrice 3x a day for 30 days. Whitening efficacy was measured subjectively and objectively using a Vita Classical shade guide and a spectrophotometer, respectively. Tooth sensitivity was registered using a Visual Analogue Scale (VAS), ranging from 0 to 10. The side effects were given from the completion of a form containing the possible effects. The psychosocial impact was determined using the Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ). Efficacy, tooth sensitivity and side effects were assessed at baseline (T0), immediately after the first use (TI), and after 7 (T7) and 30 days (T30) using the dentifrices. PIDAQ was measured at T0 and T30. Whitening efficacy was analyzed by repeated measures ANOVA and post hoc Bonferroni. For Tooth sensitivity and PIDAQ, an ordinal regression model wi... (Complete abstract click electronic access below) / Doutor

Die Arbeit befasst sich mit der Untersuchung des Reibwertes zwischen Seil und Seilrille, von hochfesten synthetischen Faserseilen, in Treibscheibensystemen. Im Grundlagenteil werden Aufbau, Funktion und Berechnung derartiger Fördersysteme nach dem Stand der Technik dargestellt. In den letzten Jahren haben als Zugmittel verstärkt Seile auf Basis hochfester, synthetischer Fasern Einzug gehalten. Diese Seile sind deutlich leichter als die bekannten Drahtseile und weisen dabei zum Teil höhere Festigkeitswerte auf. Um solche hochfesten Seile gezielt in fördertechnischen Anlagen einsetzen zu können, ist es erforderlich, diese Seile grundlegenden Untersuchungen zu unterziehen. Geprüft wird dabei z.B. auch die Treibfähigkeit. Der Wissenstand auf diesem Gebiet kann im Vergleich zu den Drahtseilen als mangelhaft angesehen werden. Um eine ausreichende Treibfähigkeit (u.a. eine Funktion des Reibwertes) zu gewährleisten, ist es notwendig die Reibwerte in Abhängigkeit des Verschleißzustandes des Seils und der Seilscheiben zu ermitteln und zu analysieren. Bei diesen Untersuchungen werden Parameter wie der Seilwerkstoff, die Rillengeometrie und die Drehzahl der Treibscheibe oder die Vorlast variiert. Ziel der Untersuchungen ist die Ermittlung vorteilhafter Kombinationen von Seil und Scheibe in Bezug auf die Treibfähigkeit. Abschließend erfolgt die kurze Darstellung einer neuen Berechnungsmethodik, welche den Stand der Technik um die Besonderheiten der Faserseile erweitert. Damit lassen sich neue Anwendungsfelder generieren. / During the last years, high-strength synthetic fibre ropes have found there ways into the sector of tension members and traction mechanisms. These ropes are significant lighter than known steel wire ropes and, beside this, do show a higher strength. For using such ropes pointedly in conveyors and conveying systems, basic research has to be done on the ropes. The behaviour in cyclic bending, the creep behaviour and wear mechanisms are to be examined. The knowledge on these fields is, compared to the knowledge on steel wire ropes, insufficient. A study on the friction coefficient of high-strength synthetic fibre ropes working on drive sheaves are to be presented within this paper. To ensure an adequate drive capability (which is a function of the coefficient of friction and the wrap-around angle), it is necessary to investigate and analyse the coefficients of friction in dependency of the state of wear. During the investigations, parameters like groove dimension, number of revolutions per minute and initial load have been varied. Target of the investigations is, to evaluate an optimised combination of rope and drive sheave in terms of drive capability. Appropriate applications in conveying engineering can be derived from this optimised combination.