Thematische Bibliographien / Arcz

Auswahl der wissenschaftlichen Literatur zum Thema „Arcz“

Autor: Grafiati
Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Arcz"

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Zúñiga, Manuel, Marie Champomier-Verges, Monique Zagorec und Gaspar Pérez-Martínez. „Structural and Functional Analysis of the Gene Cluster Encoding the Enzymes of the Arginine Deiminase Pathway ofLactobacillus sake“. Journal of Bacteriology 180, Nr. 16 (15.08.1998): 4154–59. http://dx.doi.org/10.1128/jb.180.16.4154-4159.1998.

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ABSTRACT Lactobacillus sake can use arginine via the arginine deiminase (ADI) pathway. We designed degenerate primers based on an alignment of known sequences of ornithine transcarbamoylase (OTC)-encoding genes in order to amplify the L. sakecounterpart sequences by PCR. Screening a genomic library of L. sake in λEMBL3 allowed us to isolate a clone containing a 10-kbL. sake genomic DNA insert. Sequence analysis revealed that the genes involved in arginine catabolism were clustered and encoded ADI (arcA), OTC (arcB), carbamate kinase (arcC), and a putative carrier with high similarity to the arginine/ornithine antiporter of Pseudomonas aeruginosa(arcD). Additionally, a putative transaminase-encoding gene (arcT) was located in this region. The genes followed the order arcA arcB arcC arcT arcD, which differs from that found in other microorganisms. arcA, arcB,arcC, and arcD mutants were constructed, and the ADI pathway was impaired in all of them. Transcriptional studies indicated that arcA gene is subject to catabolite repression, and under the conditions used, several transcripts could be detected, suggesting the existence of different initiation sites or processing of a larger mRNA.
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Dong, Yiqian, Yi-Ywan M. Chen, Jennifer A. Snyder und R. A. Burne. „Isolation and Molecular Analysis of the Gene Cluster for the Arginine Deiminase System from Streptococcus gordonii DL1“. Applied and Environmental Microbiology 68, Nr. 11 (November 2002): 5549–53. http://dx.doi.org/10.1128/aem.68.11.5549-5553.2002.

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ABSTRACT The arginine deiminase (AD) system (ADS) is one of two major ammonia-generating pathways in the oral cavity that play important roles in oral biofilm pH homeostasis and oral biofilm ecology. To initiate a study of the Streptococcus gordonii ADS, the ADS gene cluster was isolated from subgenomic DNA libraries of S. gordonii DL1 by using an arcB-specific probe. Nucleotide sequence analysis revealed six open reading frames (ORFs) that were arranged contiguously; the first five ORFs were transcribed in the same direction, as an apparent operon, and the sixth was transcribed in the opposite direction. The ORFs were found to share significant homologies and to correspond closely in molecular mass to previously characterized arc genes; thus, they were designated arcA (AD), arcB (ornithine carbamyltransferase), arcC (carbamate kinase), arcD (arginine-ornithine antiporter), arcT (dipeptidase), and arcR (regulator). A putative σ70 promoter (ParcA [TTGTGT-N19-TAGAAT]) was mapped 5′ to arcA by primer extension, and the expression of ParcA was shown to be inducible by arginine and repressible by glucose, in agreement with AD specific activities measured in the wild-type strain. To investigate the function of ArcR in the differential expression of the arc operon, arcR was insertionally inactivated by a KM resistance marker flanked by T4 transcription/translation termination signals, and the expression of ParcA was monitored by primer extension in the wild-type and ArcR-deficient strains. Lower levels of arcA expression, as well as lower levels of AD activity, were consistently observed in the ArcR-deficient strain compared to wild-type cells, regardless of the growth conditions. Thus, ArcR is a transcriptional activator that is required for induction and optimal expression of the S. gordonii ADS gene cluster.
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Barbosa, Flávia Rabelo, Massaru Yokoyama, Pedro Antônio Arraes Pereira und Francisco José Pfeilsticker Zimmermann. „Effect of arcelin protein on the biology of Zabrotes subfasciatus (Boheman 1833), in dry beans“. Pesquisa Agropecuária Brasileira 34, Nr. 10 (Oktober 1999): 1805–10. http://dx.doi.org/10.1590/s0100-204x1999001000006.

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Arcelin is a seed protein found in wild beans (Phaseolus vulgaris) which gives resistance to Mexican bean weevil, Zabrotes subfasciatus (Boheman 1833) (Coleoptera: Bruchidae). Studies were carried out with the objective of estimating the effect of four alleles of protein arcelin (Arc1, Arc2, Arc3 and Arc4) on the biology of Z. subfasciatus. The experiment was carried out in laboratory at Embrapa-Centro Nacional de Pesquisa de Arroz e Feijão, in Santo Antônio de Goiás, GO, Brazil, under non controlled conditions. The highest levels of antibiosis to Z. subfasciatus were observed in Arc1, with reduction in the number of eggs, number of emerged adults, adults longevity. In the line Arc2 only reduction in the number of emerged adults was observed. The lines Arc3 and Arc4 showed low efficiency on the reduction of progeny of Z. subfasciatus and effects in the longevity and egg-adult cycle were not detected. Insect sexual ratio was not altered by the presence of Arc1, Arc2, Arc3 and Arc4 in the seeds.
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Barbosa, Flávia R., Massaru Yokoyama, Pedro A. A. Pereira und F. J. P. Zimmermann. „Danos de Zabrotes subfasciatus (Boh.) (Coleoptera: Bruchidae) em linhagens de feijoeiro (Phaseolus vulgaris L.) contendo arcelina“. Anais da Sociedade Entomológica do Brasil 29, Nr. 1 (März 2000): 113–21. http://dx.doi.org/10.1590/s0301-80592000000100014.

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A arcelina é uma proteína encontrada em feijões silvestres e confere resistência ao caruncho do feijão, Zabrotes subfasciatus (Boh. 1833) (Coleoptera: Bruchidae). Comparando-se às cultivares suscetíveis Porrillo 70 e Goiano Precoce, avaliou-se a contribuição de quatro alelos da arcelina (Arc1, Arc2, Arc3 e Arc4), presentes em quatro linhagens quase isogênicas de feijoeiro, no controle de Z. subfasciatus, no período de 15 a 150 dias de armazenagem, em intervalos de 15 dias. O experimento foi conduzido em condições não controladas, utilizando-se delineamento experimental inteiramente ao acaso, em fatorial 6 x 10. Como resultado da baixa emergência de adultos em Arc1 e Arc2, constataram-se, ao final do período de armazenamento, diferenças significativas na percentagem de sementes danificadas pelo caruncho, entre as linhagens contendo Arc1 (0,0%), Arc2 (8,0%), as testemunhas suscetíveis 'Porrillo 70' (73,7%) e Goiano Precoce (99,3%) e as linhagens Arc3 (86,3%) e Arc4 (48,0%). A percentagem de emergência de plantas, imediatamente antes da armazenagem, variou de 95,3 a 97,3% entre os tratamentos, sem diferenças significativas; após 150 dias de armazenagem a emergência foi de 92% em Arc1, 84,3% em Arc2 e 83% em Arc4, as quais diferiram significativamente de Arc3 (30%), 'Porrillo 70' (41,3%) e 'Goiano Precoce' (6,7%).
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Hong, Kyongsu. „Characterization of the arginine deiminase ofStreptococcus equisubsp.zooepidemicus“. Canadian Journal of Microbiology 52, Nr. 9 (01.09.2006): 868–76. http://dx.doi.org/10.1139/w06-041.

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Streptococcus equi subsp. zooepidemicus is an important cause of infectious diseases in horses and rarely humans. Little is known about the virulence factors or protective antigens of S. equi subsp. zooepidemicus. In the present study, I designed original primers based on an alignment of the gene sagp(arcA) from Streptococcus pyogenes encoding streptococcal acid glycoprotein – arginine deiminase (SAGP/AD) to amplify the S. equi subsp. zooepidemicus counterpart sequence by polymerase chain reaction, and I analyzed the sagp(arcA) gene of the organism. Using chromosomal walking steps, I identified a contiguous eight-gene locus involved in SAGP/AD production. Their open reading frames were found to share significant homologies and to correspond closely in molecular mass to previously sequenced arc genes of S. pyogenes, thus they were designated ahrC.2 (arginine repressor), arcR (CRP/FNR transcription regulator), sagp(arcA) (streptococcal acid glycoprotein – arginine deiminase), putative acetyltransferase gene, arcB (ornithine carbamyl transferase), arcD (arginine–ornithine antiporter), arcT (Xaa-His peptidase), and arcC (carbamate kinase). The SAGP homologue of S. equi subsp. zooepidemicus (SzSAGP), encoded by arcA gene of the bacteria (arcA(SZ)), was successfully expressed in Escherichia coli and purified to homogeneity. When in vitro growth inhibitory activity of the recombinant SzSAGP was tested against MOLT-3 cells, it inhibited the growth of the cells during the 3 days of culture in a dose-dependent manner, accompanied by the induction of apoptotic cell death. The recombinant protein also possessed AD activity. By immunoblot analysis using both anti-SzSAGP-SfbI(H8) and anti-SfbI(H8) sera, I was able to demonstrate that the SzSAGP protein is expressed on the streptococcal surface.Key words: SAGP, arginine deiminase, Streptococcus equi subsp. zooepidemicus.
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Gruening, Petra, Marcus Fulde, Peter Valentin-Weigand und Ralph Goethe. „Structure, Regulation, and Putative Function of the Arginine Deiminase System of Streptococcus suis“. Journal of Bacteriology 188, Nr. 2 (15.01.2006): 361–69. http://dx.doi.org/10.1128/jb.188.2.361-369.2006.

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ABSTRACT Streptococcus suis is an important cause of infectious diseases in young pigs. Little is known about the virulence factors or protective antigens of S. suis. Recently, we have identified two proteins of the arginine deiminase system (ADS) of S. suis, which were temperature induced and expressed on the streptococcal surface (N. Winterhoff, R. Goethe, P. Gruening, M. Rohde, H. Kalisz, H. E. Smith, and P. Valentin-Weigand, J. Bacteriol. 184:6768-6776, 2002). In the present study, we analyzed the complete ADS of S. suis. Due to their homologies to the recently published S. gordonii ADS genes, the genes for arginine deiminase, ornithine carbamoyl-transferase, and carbamate kinase, which were previously designated adiS, octS, and ckS, respectively, were renamed arcA, arcB, and arcC, respectively. Our data revealed that arcA, arcB, and arcC of the S. suis ADS are transcribed from an operon (arcABC operon). Additionally, putative ADS-associated genes were cloned and sequenced which, however, did not belong to the arcABC operon. These were the flpS gene upstream of the arcABC operon with homology to the flp transcription regulator of S. gordonii and the arcD, arcT, arcH, and argR genes downstream of the arcABC operon with high homologies to a putative arginine-ornithine antiporter, a putative dipeptidase of S. gordonii, a putative β-N-acetylhexosaminidase of S. pneumoniae, and a putative arginine repressor of S. gordonii, respectively. The transcriptional start point of the arcABC operon was determined, and promoter analysis provided evidence that multiple factors contribute to the regulation of the ADS. Thus, a putative binding site for a transcription regulator of the Crp/Fnr family, an ArgR-binding site, and two cis-acting catabolite response elements were identified in the promoter-operator region of the operon. Consistent with this, we could demonstrate that the ADS of S. suis is inducible by arginine and reduced O2 tension and subject to carbon catabolite repression. Furthermore, comparing an arcA knockout mutant in which expression of the three operon-encoded proteins was abolished with the parental wild-type strain showed that the arcABC operon of S. suis contributes to survival under acidic conditions.
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Andryushin, A. „Ice loads on pod unit bodies of ice-going ships“. Transactions of the Krylov State Research Centre S-I, Nr. 2 (28.12.2020): 19–30. http://dx.doi.org/10.24937/2542-2324-2020-2-s-i-19-30.

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This paper presents the methodology for determination of ice loads on the elements of pod propulsion units for Arc4-Arc9 ships. The conclusion gives calculation results for ice loads on pod units for Arc5 and Arc7 ships, and compares these results with those obtained as per DNV-GL rules for ice classes PC6, PC5, PC3
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Brual, Typhaine, Géraldine Effantin, Julie Baltenneck, Laetitia Attaiech, Cloé Grosbois, Monique Royer, Jérémy Cigna, Denis Faure, Nicole Hugouvieux-Cotte-Pattat und Erwan Gueguen. „A natural single nucleotide mutation in the small regulatory RNA ArcZ of Dickeya solani switches off the antimicrobial activities against yeast and bacteria“. PLOS Genetics 19, Nr. 4 (27.04.2023): e1010725. http://dx.doi.org/10.1371/journal.pgen.1010725.

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The necrotrophic plant pathogenic bacterium Dickeya solani emerged in the potato agrosystem in Europe. All isolated strains of D. solani contain several large polyketide synthase/non-ribosomal peptide synthetase (PKS/NRPS) gene clusters. Analogy with genes described in other bacteria suggests that the clusters ooc and zms are involved in the production of secondary metabolites of the oocydin and zeamine families, respectively. A third cluster named sol was recently shown to produce an antifungal molecule. In this study, we constructed mutants impaired in each of the three secondary metabolite clusters sol, ooc, and zms to compare first the phenotype of the D. solani wild-type strain D s0432-1 with its associated mutants. We demonstrated the antimicrobial functions of these three PKS/NRPS clusters against bacteria, yeasts or fungi. The cluster sol, conserved in several other Dickeya species, produces a secondary metabolite inhibiting yeasts. Phenotyping and comparative genomics of different D. solani wild-type isolates revealed that the small regulatory RNA ArcZ plays a major role in the control of the clusters sol and zms. A single-point mutation, conserved in some Dickeya wild-type strains, including the D. solani type strain IPO 2222, impairs the ArcZ function by affecting its processing into an active form.
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Mandin, Pierre, und Susan Gottesman. „Integrating anaerobic/aerobic sensing and the general stress response through the ArcZ small RNA“. EMBO Journal 29, Nr. 18 (03.08.2010): 3094–107. http://dx.doi.org/10.1038/emboj.2010.179.

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Lassak, Jürgen, Anna-Lena Henche, Lucas Binnenkade und Kai M. Thormann. „ArcS, the Cognate Sensor Kinase in an Atypical Arc System of Shewanella oneidensis MR-1“. Applied and Environmental Microbiology 76, Nr. 10 (26.03.2010): 3263–74. http://dx.doi.org/10.1128/aem.00512-10.

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ABSTRACT The availability of oxygen is a major environmental factor for many microbes, in particular for bacteria such as Shewanella species, which thrive in redox-stratified environments. One of the best-studied systems involved in mediating the response to changes in environmental oxygen levels is the Arc two-component system of Escherichia coli, consisting of the sensor kinase ArcB and the cognate response regulator ArcA. An ArcA ortholog was previously identified in Shewanella, and as in Escherichia coli, Shewanella ArcA is involved in regulating the response to shifts in oxygen levels. Here, we identified the hybrid sensor kinase SO_0577, now designated ArcS, as the previously elusive cognate sensor kinase of the Arc system in Shewanella oneidensis MR-1. Phenotypic mutant characterization, transcriptomic analysis, protein-protein interaction, and phosphotransfer studies revealed that the Shewanella Arc system consists of the sensor kinase ArcS, the single phosphotransfer domain protein HptA, and the response regulator ArcA. Phylogenetic analyses suggest that HptA might be a relict of ArcB. Conversely, ArcS is substantially different with respect to overall sequence homologies and domain organizations. Thus, we speculate that ArcS might have adopted the role of ArcB after a loss of the original sensor kinase, perhaps as a consequence of regulatory adaptation to a redox-stratified environment.
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Dissertationen zum Thema "Arcz"

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Brual, Typhaine. „Unraveling virulence regulation in pectinolytic bacteria : Insights from ArcZ and RsmC“. Electronic Thesis or Diss., Lyon, INSA, 2023. http://www.theses.fr/2023ISAL0100.

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Les bactéries pectinolytiques du genre Dickeya prospèrent dans diverses niches écologiques, y compris l'eau, le sol et les plantes, s'adaptant à des environnements complexes et en constante évolution, façonnés par diverses interactions biotiques et abiotiques.Dans cette thèse, nous avons étudié les mécanismes qui régulent la virulence du genre Dickeya, en particulier D. dadantii et D. solani.Nos principaux résultats concernent la régulation post-transcriptionnelle exercée par le sRNA ArcZ et la régulation post-traductionnelle modulée par la protéine RsmC. ArcZ est un acteur clé de l'adaptation de D. solani, régulant la motilité en fonction des conditions environnementales et favorisant la virulence lors de l'infection des plantes. En outre, ArcZ joue un rôle essentiel dans la résistance à l’acidité.RsmC, quant à lui, est impliqué dans la régulation de la motilité et joue un rôle complexe dans la virulence. Nos résultats suggèrent de nouvelles interactions pour RsmC et ouvrent des perspectives pour l'étude d'autres fonctions non documentées.En un mot, notre étude révèle comment des régulateurs tels que ArcZ et RsmC orchestrent les réponses bactériennes à un environnement dynamique. Ces résultats mettent en évidence l'adaptabilité des espèces du genre Dickeya et soulignent l'importance du contexte écologique dans l'étude du comportement bactérien
Pectinolytic bacteria of the genus Dickeya thrive in diverse ecological niches including water, soil and plants, adapting to complex and ever-changing environments shaped by various biotic and abiotic interactions. In this thesis, we investigated the mechanisms that regulate the virulence of the genus Dickeya, in particular D. dadantii and D. solani. Our main findings concern post-transcriptional regulation exerted by the sRNA ArcZ and post-translational regulation modulated by the protein RsmC. ArcZ is a key player in D. solani adaptation, regulating motility according to environmental conditions and enhancing virulence during plant infection. In addition, ArcZ plays a critical role in acid resistance. RsmC, in turn, is involved in the regulation of motility and has a complex role in virulence. Our results suggest novel interactions for RsmC and open perspectives for studying other undocumented functions. In a word, our study reveals how regulators such as ArcZ and RsmC orchestrate bacterial responses to a dynamic environment. These findings highlight the adaptability of Dickeya species and underscore the importance of ecological context in the study of bacterial behavior
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Pearson, John Beverly. „Aspects of energy transport in a vortex stabilized arc“. Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25955.

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Vortex stabilized argon arcs are of interest as sources of high intensity light. Previous workers in the field have found that the heat transported to the wall of the arc vessel greatly exceeded that predicted by theory. Two modifications to the theory have been proposed to account for the observed values of heat transport. This thesis describes a specialized arc vessel which has been constructed to allow the measurement of the axial profile of heat transported to the wall. The axial profile of radiation produced by the arc has also been measured. These experiments elucidate the mechanisms responsible for the large values of heat transported to the wall. In this work a 225 A d.c. arc was used. It was stabilized by an argon vortex at a pressure of 5.5 atm. It is found that the electrode regions of the arc contribute significantly to the total heat transported to the wall. Midway between the electrodes however, the profile is found to be quite flat. The experiments also indicate that some heat is transported upstream from the arc, and it has been shown that this is due to a reverse axial flow core in the gas vortex. The measured profile of radiation produced by the arc is found to be very uniform in the arc column. In the region midway between the electrodes the dependence of the radiation and heat transported to the wall on the gas flow rate in the vortex were examined. The measured radiation is found to be 30-35% less than predicted by theory. It is shown that this may be due to the axial transport of energy in the arc. The scaling of the amount of heat transported to the wall is found to be in good agreement with the predictions of a model for the arc which includes turbulent heat transport by using a mixing length model. The d.c. power supply used in this work produces a waveform with considerable ripple. Time dependent measurements were therefore made of the radiation produced by the arc and the electrical power input to the arc column. These results are compared with a time dependent theory of the arc column.
Science, Faculty of
Physics and Astronomy, Department of
Graduate
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Seon, Hongsun 1965. „Electrode erosion and arc stability in transferred arcs with graphite electrodes“. Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=108637.

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Arc stability and erosion behavior were studied on a hollow graphite DC cathode in an argon atmosphere at atmospheric pressure. It was found that the arc stability is associated with the electron emission mode transition of the cathode operation. Estimation of current densities, SEM pictures, Fast Fourier Transform (FFT) of total voltage, and measurement of cathode surface temperature supported this. Stable arcs are in the thermionic emission regime while unstable arcs in the thermofield emission regime. Higher argon gas flow rate is believed to cause the shift of the mode from the thermofield emission to the thermionic emission by increasing the arc root temperature through steepening the thermal gradient at the arc root and increasing ionization phenomena inside the arc. Sharp cathode tip geometry usually leads to the thermionic emission while a rounded tip geometry encourages the thermofield emission. For the unstable arcs, the high voltage fluctuation resulted from the jumping of the arc root between different cathode spots and changes in the arc length. In the stable arcs, however, the voltage was almost constant because of the absence of arc jumping. The standard deviation of the voltage was used as the arc stability indicator and was less than 3 V for the stable arc in this transferred arc system.
The erosion rate of the cathode in this work ranged from 0.41 to 2.61 mug/C. At 150 A runs the arc stability strongly influenced the erosion rate; as the arc stability increased, the erosion rate decreased. Higher currents runs (300 and 400 A), however, showed the opposite trend because of the carbon vapor redeposition. The total erosion rates of 150 A runs were separated into the stable (Es) and the unstable (Eu) erosion rate. The Eu was more than 3 times higher in this work. It is believed that the thermofield emission of the unstable arcs produced more erosion because of the higher local heat flux to the cathode spots.
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Barbosa, Palmira Cordeiro. „Estudo da interação de paredes de alvenaria estrutural com vigas de concreto armado“. Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-20042018-211018/.

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Este trabalho apresenta modelos numéricos em elementos finitos, elaborados com o auxílio do programa ANSYS 5.5, de paredes de alvenaria estrutural apoiadas em vigas de concreto armado. São estudados diversos modelos possíveis de serem utilizados, inclusive com a consideração das não-linearidades de contato, ou seja, a separação e o deslizamento que tendem a ocorrer na interface parede-viga por ocasião do efeito arco. Para tanto, são introduzidos elementos de contato nesta interface. Os resultados obtidos são comparados entre si e também com resultados experimentais encontrados na literatura, de modo a se avaliar as características positivas e negativas de cada procedimento.
This work describes numerical procedures using ANSYS 5.5 program for modeling masonry walls supported by reinforced concrete beams. Several available procedures for this case are studied, including or not, non-linear effects that can occur at the boundary surface between the masonry wall and the concrete beam, because of the arch effect. So, obtained results for these numerical models are compared among themselves and with experimental results found in papers, in order to obtain some information about their acuity.
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Ribeiro, Anderson Clayton Nascimento. „Avaliação da soldagem do aço naval AH36 microligado soldado pelo processo arco submerso com um e dois arames“. Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-16112015-002331/.

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Diversas pesquisas em processos de soldagem para construção naval concentram-se em reduzir peso, aumentar a eficiência de energia, melhorar a resistência à corrosão e à tenacidade, bem como reduzir custos e tempo na construção dos navios. O aço naval microligado, AH36, apresenta boa correlação entre estrutura, propriedades mecânicas e soldabilidade. Estas características se devem principalmente a redução dos teores de carbono em função do uso de elementos microligantes como V, Nb e Ti, e do tipo de processo de obtenção das chapas pelo processo termomecânico seguido de resfriamento acelerado (em inglês: Thermomechanical control process -TMCP). Assim, o objetivo deste trabalho é avaliar a soldagem do aço naval AH 36 pelo processo de arco submerso com um e dois arames. Para tanto foram empregados os ensaios mecânicos de tração, de dobramento e de dureza. A tenacidade foi determinada pelo ensaio de Charpy com entalhe em V. Para caracterização metalográfica foram aplicadas as seguintes técnicas: Microscopia óptica (MO) e Microscopia eletrônica de varredura (MEV) e difração de raios X. Os resultados mostraram que as juntas soldadas apresentaram limite de resistência máxima de 561 MPa, com rompimento localizado no metal de base. No ensaio de microdureza foi observado que a região de crescimento de grão da zona afetada pelo calor, no experimento com a técnica Tandem, apresentou-se a região mais rígida das juntas analisadas, também o valor de microdureza no metal de solda foi 10% maior que no metal de base. Os resultados dos ensaios de impacto Charpy V mostraram que a temperatura de transição dúctil frágil do metal de base é de -30ºC. Da mesma maneira, o menor valor de energia absorvida foi para região do metal de solda. Através da análise da micrografia foi possível identificar diferentes morfologias de ferrita, a presença de perlita e pequenas regiões de martensita, bem como a presença de agregados MA.
Several researches in welding processes for shipbuilding has been focusing on reducing weight, increasing energy efficiency, improving corrosion resistance and toughness as well as reducing costs and time in the construction of ships. The microalloyed steel AH36 shipbuilding presents a good correlation among structure, mechanical properties and weldability. These features are mainly because reduction in carbon content due to the use of microalloying elements such as V, Nb and Ti, together with the process of steel plates by thermomechanical control process (TMCP), Therefore, the objective of this study is to evaluate the welding of shipbuilding steel AH 36 by submerged arc process with one and two wires. It was utilized tests such as: tensile, bending and hardness tests. The toughness was determined by Charpy V-Notch test. The metallographic characterization was carried out by the following techniques: optical microscopy (OM) and scanning electron microscopy (SEM) and X-Rays diffraction. The results showed that the tensile test for welded joints presented maximum resistance limit of 561 MPa, and the rupture was located in the base metal. Microhardness test showed that the region of coarse grain of heat affected zone, in the tandem submerged arc welding (SAW), presented the hardest region of the welded joint, also the microhardness value in the weld metal was 10% greater than the metal base. Charpy V notch test tests depicted a ductile brittle transition temperature at about -30 ºC. In the same way, the lowest absorbed energy was identified in the weld metal region. Through microstructure characterization it was possible to identify different morphologies of ferrite, pearlite and the small presence of martensite, as well as, the presence of aggregates MA.
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Tomás, Andreia Carina Jacinto. „Conservação e reabilitação de estruturas arqueadas : proposta metodológica de intervenção“. Master's thesis, Universidade de Lisboa. Faculdade de Arquitetura, 2014. http://hdl.handle.net/10400.5/7883.

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Soares, Thaís Macedo. „Comparação entre a forma e dimensão do arco dentário inferior de Brasileiros e Norte Americanos“. Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1269.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
A largura e a forma do arco dentário são importantes fatores para se determinar os objetivos e a estabilidade do tratamento ortodôntico. Este estudo visa determinar as diferenças morfológicas entre o arco dentário inferior de indivíduos Caucasianos Norte-Americanos (AM) e Caucasianos Brasileiros (BR), de acordo com a Classe de Angle e o gênero. A amostra foi constituída por 331 modelos de gesso pré-tratamento ortodôntico da arcada inferior, tendo sido obtida a partir de dois grupos: 160 Caucasianos Norte-Americanos (60 Classe I, 50 Classe II e 50 Classe III) e 171 Caucasianos Brasileiros (61 Classe I, 60 Classe II e 50 Classe III). As superfícies oclusais dos modelos de gesso foram fotocopiadas; a partir das imagens obtidas, foi identificado o ponto clínico do braquete para cada dente de acordo com a espessura do dente inferior referentes aos dados de Andrews. Baseado nestes pontos, foram realizadas medidas de dimensões do arco dentário com o uso de um paquímetro e verificada a forma do arco com templates ortodônticos. Os dados referentes às dimensões do arco foram avaliados estatisticamente através da análise de Kruskal-Wallis e para se avaliar a diferença na distribuição de freqüência de forma de arco foi utilizado o teste Qui-quadrado. Os resultados mostraram que existem diferenças significativas nas dimensões do arco dentário entre AM e BR. O grupo AM apresentou uma menor largura intercaninos que o grupo BR (p<0,05), exceto para o subgrupo feminino Classe I. A largura intermolares também foi menor no grupo AM (p<0,05), mas não foram encontradas diferenças significativas nos subgrupos de Classe III. Os valores médios de profundidade de arco na região de caninos e de molares foram menores para o grupo BR, porém apenas significativas para o subgrupo feminino Classe I (p<0,05). Quando comparada a forma de arco houve diferença na distribuição de freqüência entre os grupos AM e BR, entretanto pelo tamanho da amostra e por serem dados nominais as diferenças não foram estatisticamente significativas. Verificou-se que para o grupo AM a forma de arco mais prevalente foi a parabólica (44%), seguida pela ovóide (38%) e quadrática (18%). Para o grupo BR a forma prevalente foi a ovóide (43%), seguida pela parabólica (29%) e quadrática (28%). Para o subgrupo de Classe II houve uma maior freqüência da forma parabólica nos grupos AM e BR masculino; para o subgrupo de Classe III houve uma maior freqüência da forma quadrática para os grupos AM e BR feminino. Conclui-se que existem diferenças na forma e dimensão do arco dentário inferior entre os grupos AM e BR e de acordo com a Classificação de Angle. Clinicamente parece ser favorável a disponibilidade de fios ortodônticos com diversos tipos de arcos pré-formados de acordo com o grupo étnico e o tipo de maloclusão.
The purpose of this study was to evaluate the morphologic differences between North American Caucasian (AM) and Brazilian Caucasian (BR) mandibular dental arches. The sample consisted of 331 pretreatment mandibular orthodontic plaster models divided in two groups; 160 of North American Caucasians (60 Class I, 50 Class II and 50 Class III) and 171 of Brazilians (61 Class I, 60 Class II and 50 Class III). The occlusal surfaces of the mandibular models were photocopied and the clinical bracket point for each tooth was identified. Templates were overlaid to select the arch form; additionally 4 linear and 2 proportional measurements were taken. The results showed significantly differences in arch dimension between the two ethnic groups. The AM group showed significantly smaller intercanine width (p<0,05), excepting for the Class I aches in the female group. In addition, the AM group also showed a significantly smaller intermolar width (p<0,05); no differences were found in the Class III malocclusion group though. The BR group showed smaller canine and molar depths, but the differences were significantly smaller only in the Class I female group (p<0,05). The comparison of arch forms between AM and BR revealed no statistically significant difference due to the insufficient sample size for nominal data. Despite that, differences in the frequency of distributions of the three arch forms were found. The tapered arch forms were more common in the AM group (44%), followed by ovoid (38%) and square (18%). The most frequent arch forms seen were the ovoid in the BR group (43%), followed by tapered (29%) and squared (28%). Differences among Angle classifications were observed in arch form; the Class II group exhibited the higher frequency of tapered arch forms and the Class III the higher frequency of squared arch form. Brazilian arch forms were more ovoid and the Caucasian arch forms were more tapered. Brazilian arches were wider than Caucasian arches. The arch form had a tendency to be more ovoid or tapered in Class I group, more tapered in Class II group, and more ovoid or square in Class III group. The arches had a tendency to be wider in Class III group and narrower in Class II group. The results suggest that it is necessary to have specific arch forms available according to the Angle Classification and ethnic group. Significant differences exist among the AM and BR mandibular arch form and dimensions. These differences are also observed between Angle classifications. Clinically, it seems reasonable to have different preformed arch wires available according to the ethnic group and type of malocclusion.
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Weerasekara, Madhawa. „DC arc faults in photovoltaic systems“. Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/130681/1/Madhawa_Weerasekara_Thesis.pdf.

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This research presents a detailed study of DC Arc faults in Photo-voltaic systems. A unique DC arc model is proposed and the use of Wavelet transforms and Mathematical Morphology to successfully detect DC arcs in a PV system is investigated. The proposed DC arc model is applicable for arc length changes caused by moving conductive parts. The study also presents a test setup to capture arc waveform for analysis.
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Yee, Kin Choi Elsa. „Étude des arcs et leurs conséquences sur les matériaux de contact électrique de puissance pour des applications DC“. Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S045/document.

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À ce jour, nous trouvons de nombreux systèmes requérant l'usage du courant continu dans l'industrie automobile, aéronautique, ferroviaire ou encore dans les panneaux solaires. L'ouverture et la fermeture des circuits alimentés (relais, interrupteurs, etc.) engendrent inévitablement un arc électrique (température ~5000 K). Celui-ci provoque des dégradations plus ou moins importantes aux matériaux de contact, telles que l'érosion, la soudure et l'augmentation de la résistance de contact, pouvant engendrer des dysfonctionnements des appareillages et porter atteinte à la sécurité des personnes qui les utilisent. Face à la demande de puissance électrique des appareils actuels, il est nécessaire d'augmenter la tension ou le courant d'alimentation. La tension actuelle à bord d'une voiture est de 14 VDC, il est envisagé d'augmenter cette tension à 42 VDC afin d'augmenter la puissance pour faire face à la croissance des appareils électroniques et électriques embarqués. L'intérêt d'augmenter la tension, notamment pour des applications liées au milieu automobile, permet de maintenir l'intensité du courant donc conserver un faible diamètre de câble pour une puissance plus importante et permet de ne pas rajouter une masse supplémentaire à la voiture. Cependant, le passage d'une tension de 14 VDC à 42 VDC augmente fortement ces dommages causés aux matériaux de contact par les arcs électriques. Il existe différents moyens permettant la diminution de la durée d'arc, par exemple l'optimisation du dispositif mécanique (modification de la vitesse d'ouverture des contacts, double coupure), ou bien l'utilisation d'aimants permanents qui génèrent un champ magnétique et soufflent l'arc hors de la zone de contact ou encore la modification du matériau de contact (composition chimique, forme). Les matériaux caractérisés dans cette étude allient le soufflage magnétique et l'optimisation de la composition chimique de façon à trouver un bon compromis pour limiter les dégâts causés par les arcs d'ouverture et par les arcs de fermeture. En effet, l'action du champ magnétique permet de diminuer la durée de l'arc d'ouverture (diminution d'un facteur 10) mais n'a malheureusement aucun effet sur l'arc de fermeture. D'où la nécessité de modifier la composition chimique du matériau, notamment par ajout d'oxydes métalliques (SnO2) afin de limiter les dommages de l'arc de fermeture
Nowadays, we find many systems requiring the use of direct current in the automotive, aerospace, rail, or in solar panels. The opening and closing of the powered circuits (as relays, switches, etc.) inevitably generate an electric arc (temperature ~5000 K). This arc causes more or less significant damage to the contact materials, such as erosion, welding and increase the contact resistance, which can lead to malfunction of the equipment and impair the safety of people who use them. Facing the electric power demand of current devices, it is necessary to increase the voltage or the supply current. Currently, the voltage on board a car is 14VDC, it is planned to increase this to 42VDC voltage, to increase the power to deal with the increase of embedded electronics and electrical appliances. The interest to increase the voltage, especially for applications related to the automotive environment, keeps the current intensity therefore maintain a low cable diameter for greater power and allows not to add an additional weight to the car. However, the passage of a voltage of 14VDC to 42VDC greatly increases the damage caused to contact materials by electric arcs. There are different ways to decrease the arc duration, e.g. optimizing the mechanical device (change in opening speed of the contacts, double break), or the use of permanent magnets that generate a magnetic field and blow the arc out of the contact area, or changing the contact material (chemical composition, shape). The materials characterized in this study combine magnetic blowing and optimizing the chemical composition in order to find a good compromise to limit the damage caused by break and make arcs. Indeed, the action of the magnetic field can reduce the duration of the break arc (decrease by a factor 10) but unfortunately has no effect on the make arc. Hence, the need to modify the chemical composition of the material, including adding metal oxide (SnO2) to limit the make arcs damages
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Schneider, Wolfgang. „Studies on arcing phenomena at high current discharges“. Thesis, University of Essex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310044.

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Bücher zum Thema "Arcz"

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1804-1858, Bajza József, Hrsg. Új Plutarch, vagy, Minden korok és nemzetek leghiresebb férfiai és hölgyeinek arcz- és életrajza. [Budapest]: Kossuth, 2003.

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Prabha, Durgapal, und Ames Research Center, Hrsg. Arc-heater performance research: Final technical report for cooperative agreement NCC2-688 for the period April 1, 1990 - January 31, 1994. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1994.

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Shepard, Charles E. Arc-heater performance research: Final technical report for cooperative agreement NCC2-688 for the period April 1, 1990 - January 31, 1994. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1994.

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Prabha, Durgapal, und Ames Research Center, Hrsg. Arc-heater performance research: Final technical report for cooperative agreement NCC2-688 for the period April 1, 1990 - January 31, 1994. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1994.

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Djulaeha, Ningrum. Arca. Bandung: PT Kiblat Buku Utama, 2013.

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Ikaiḍamī, Z̤afar, Hrsg. Arcū. Karachi]: Z̤afar Ikaiḍamī, 2014.

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Noguera, Ediel Pérez. Arca. Ciudad de La Habana: Ediciones Unión, 2017.

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Dasuki, Muhd Nasruddin. Arca. Kuala Lumpur: Dewan Bahasa dan Pustaka, 2003.

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Goldsworthy, Andy. Arch. New York: H.N. Abrams, 1999.

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Arca. Caracas: Editorial Planeta Venezolana, 2007.

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Buchteile zum Thema "Arcz"

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Gill, Jim. „Island Arc Volcanism, Volcanic Arcs“. In Encyclopedia of Marine Geosciences, 1–7. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6644-0_20-2.

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Gill, Jim. „Island Arc Volcanism, Volcanic Arcs“. In Encyclopedia of Marine Geosciences, 379–83. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6238-1_20.

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Guelachvili, G. „99 ArCN+ (ArCN+)“. In Linear Triatomic Molecules, 164–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-74187-9_32.

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Marushchak, Yaroslav, Mykhaylo Dorozhovets und Damian Mazur. „Operational Estimating of Arcs Voltage of Arc Steel Furnace“. In Lecture Notes in Electrical Engineering, 191–201. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11187-8_15.

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Schawel, Christian, und Fabian Billing. „ARIZ“. In Top 100 Management Tools, 35–36. Wiesbaden: Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-18917-4_9.

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Hicks, B. B. „Arch“. In Topics in Micrometeorology. A Festschrift for Arch Dyer, 1–8. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2935-7_1.

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Scherrmann, Jean-Michel, Kim Wolff, Christine A. Franco, Marc N. Potenza, Tayfun Uzbay, Lisiane Bizarro, David C. S. Roberts et al. „ARCI“. In Encyclopedia of Psychopharmacology, 151. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-68706-1_4069.

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Schawel, Christian, und Fabian Billing. „ARIZ“. In Top 100 Management Tools, 25–27. Wiesbaden: Gabler Verlag, 2012. http://dx.doi.org/10.1007/978-3-8349-4105-3_8.

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Schawel, Christian, und Fabian Billing. „ARIZ“. In Top 100 Management Tools, 24–26. Wiesbaden: Gabler Verlag, 2014. http://dx.doi.org/10.1007/978-3-8349-4691-1_8.

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Schawel, Christian, und Fabian Billing. „ARIZ“. In Top 100 Management Tools, 32–33. Wiesbaden: Gabler, 2011. http://dx.doi.org/10.1007/978-3-8349-6605-6_8.

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Konferenzberichte zum Thema "Arcz"

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Können, G. P. „Identification of Odd-Radius Halo Arcs and of 44°/46° Parhelia by their Inner-Edge Polarization“. In Light and Color in the Open Air. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/lcoa.1997.ltua.3.

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Birefringence of ice causes inner edges of refraction halos to be polarized. The direction of this polarization relates directly with the projection of the crystal optic axis (C-axis) onto the sky. Hence, the inner-edge polarisation can serve as an observational diagnostic for determining the actual nature of halo arcs that resembles each other closely. It can be e.g. decisive for the identification of a spot that might be either a 44° parhelion or a 46° parhelion, of an arc that might be either a 22° sunvex Parry arc or a 20° Parroid arc that arises from plate-oriented pyramidal crystals, and of an arc that might be either a 22° suncave Parry arc or a 23° Parroid arc from plate-oriented pyramidal crystals (with Parriod arcs I mean arcs that arise from a wedge in a doubly oriented pyramidal crystal for which the refracting edge is horizontal). Polarization properties of other rare arcs will be discussed. Practical hints are given for observing the inner edge polarization of halos, arcs and spots.
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Ku, Bih-Yuan, und Guan-Ru Chen. „Assessment of Pantograph Loss-of-Contact Transients: A Follow-Up“. In 2017 Joint Rail Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/jrc2017-2270.

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In this paper we present the follow-up of our work on the assessment of pantograph arcs during loss-of-contact transients. It is not easy to accurately detect the gap between the contact strip of the pantograph and the contact wire on the fly. Instead, in the European Standards EN50119 the measurable arcs are used in the performance criteria. This paper addresses the issue of arc detection from two aspects: arc image and arc intensity. Using the arc intensity sensors and an action camera we performed two field tests to verify the speculation that arc intensity does vary in different directions. This implies the requirement of more than one sensor in the detection of arcs, and the need to combine the outputs of all sensors to obtain an effective measure of arc intensity. Both issues are addressed in this paper using video clips and measurement data conducted in a field test in Taiwan.
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Delachaux, Thierry, Ralf-Patrick Sutterlin und Dietmar Gentsch. „Investigations of arc instabilities in DC vacuum arcs“. In 2021 29th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV). IEEE, 2021. http://dx.doi.org/10.1109/isdeiv46977.2021.9586963.

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Al-Janahi, Fatima, Sawsan Shukri, Kais Abdulmawjood und Robert S. Balog. „Characterizing DC Arcs for Photovoltaic Arc Fault Detection“. In 2020 2nd International Conference on Photovoltaic Science and Technologies (PVCon). IEEE, 2020. http://dx.doi.org/10.1109/pvcon51547.2020.9757727.

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Rocco, A., D. V. Oliveira, E. Garbin und F. M. Fernandes. „Analysis of the "Ponte do arco" Stone Masonry Arch Bridge“. In IABSE Symposium, Wroclaw 2020: Synergy of Culture and Civil Engineering – History and Challenges. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2020. http://dx.doi.org/10.2749/wroclaw.2020.0934.

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<p>The “Ponte do Arco” stone masonry arch bridge is located in the north of Portugal, in the municipality of Marco de Canaveses, district of Porto. The bridge is immersed in a remote natural environment and is part of the Romanesque Route, which links buildings and structures built in the area during the Romanesque Period. The “Ponte do Arco” bridge is a fine example of this type of architecture and, therefore, it deserves devoted conservation and maintenance works. The geometry of the bridge, the internal structure of the pavement and the damage state were characterised by using two non-destructive techniques, photogrammetry and ground penetrating radar, and by performing a damage survey. The data collected was used to perform limit and finite element analyses in order to estimate the structural safety level of the structure. The paper presents the structural appraisal, resulting from the non-destructive surveys and the numerical analyses.</p>
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Biafore, John J., Mark Neisser, Gary dela Pena, Jeffrey D. Byers, Medhat A. Toukhy und Joseph E. Oberlander. „Modeling of reactive soluble ARCs and photoresist-ARC interaction“. In Microlithography 2004, herausgegeben von Bruce W. Smith. SPIE, 2004. http://dx.doi.org/10.1117/12.536748.

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Saevarsdottir, G. A., M. Thoresen und Jon Arne Bakken. „IMPROVED CHANNEL ARC MODEL FOR HIGH-CURRENT AC ARCS“. In Progress in Plasma Processing of Materials, 1999. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/itppc-1998.220.

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Katare, Pranav, Rajaramamohanarao Chennu, S. Sudhakar Reddy, Anupam Awasthi und B. Ramachandra. „Evaluation of arc conductance for high current fault arcs“. In 2017 7th International Conference on Power Systems (ICPS). IEEE, 2017. http://dx.doi.org/10.1109/icpes.2017.8387408.

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Carvalho, Cláudio, Jonas Costa, Raul Lopes, Ana Karolina Maia, Nicolas Nisse und Cláudia Linhares Sales. „Characterizing Networks Admitting k Arc-disjoint Branching Flows“. In Encontro de Teoria da Computação. Sociedade Brasileira de Computação - SBC, 2020. http://dx.doi.org/10.5753/etc.2020.11089.

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An s-branching flow f in a network N = (D,c) (where c is the capacity function) is a flow that reaches every vertex in V(D) \ {s} from s while loosing exactly one unit of flow in each vertex other than s. In other words, the difference between the flow entering a vertex v and a flow leaving a vertex v is one whenever v is different from s. It is known that the hardness of the problem of finding k arc-disjoint s-branching flows in network N is linked to the capacity c of the arcs in N: the problem is solvable in polynomial time if every arc has capacity n - l, for fixed l, and NP-complete in most other cases, with very few cases open. We further investigate a conjecture by Costa et al. from 2019 that aims to characterize networks admitting k arc-disjoint s-branching flows, generalizing a classical result by Edmonds that provides such characterization when all arcs have capacity n-1. We show that, in general, the conjecture is false. However, on the positive side, it holds for digraphs formed by out-branchings together with parallel arcs.
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Katare, Pranav, Rajaramamohanarao Chennu, B. Ramachandra, S. Sudhakara Reddy und Anupam Awasthi. „Estimation of Arc voltage characteristic for high current fault Arcs“. In 2017 International Conference on Smart Grids, Power and Advanced Control Engineering (ICSPACE). IEEE, 2017. http://dx.doi.org/10.1109/icspace.2017.8343444.

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Berichte der Organisationen zum Thema "Arcz"

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Traczinski, Adriana, Felipe Carvalho de Macêdo, Ivete Aparecida de Mattias Sartori und José Mauro Granjeiro. Advantages and limitations related to the rehabilitation of edentulous jaw with implant supported prostheses made of monolithic zirconia: systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, Januar 2022. http://dx.doi.org/10.37766/inplasy2022.1.0111.

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Review question / Objective: P: edentulous maxillary arch; I: Full arch rehabilitation with monolithic zirconia or veneered prosthesis retained by implants; C: none; O: Biomechanical complications (framework fracture, chipping, complications, advantages, limitations); S: RCT, nor randomized clinical trials. Condition being studied: Biomechanical complications resulting from the oral rehabilitation of edentulous maxillary arch through the use of implant-supported full arc prostheses made of monolithic zirconia. Eligibility criteria: Total edentulous maxillary arch patients; rehabilitated with implants; monolithic zirconia prostheses with full contour or vestibular face with application of feldspathic ceramics or full veneered or with segmented zirconia crowns; the condition of the opposing arch must be described; the number of maxillary implants that support the prosthesis must be a minimum of 4 implants.
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Hamilton, James. Macroeconomics and ARCH. Cambridge, MA: National Bureau of Economic Research, Juni 2008. http://dx.doi.org/10.3386/w14151.

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McCauley, Moira, und Tim Kennedy. Arco Norte Electrical Interconnection Study. Inter-American Development Bank, Juli 2016. http://dx.doi.org/10.18235/0000379.

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Danny M. Deffenbaugh, Klaus Brun, Ralph E. Harris, J. Pete Harrell, Robert J. Mckee, J. Jeffrey Moore, Steven J. Svedeman et al. ADVANCED RECIPROCATING COMPRESSION TECHNOLOGY (ARCT). Office of Scientific and Technical Information (OSTI), Dezember 2005. http://dx.doi.org/10.2172/876564.

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Demchyna, Bohdan, und Yaroslav Shydlovskyi. Recommendations for Designing Wooden Arches on Metal-toothed Plates. Intellectual Archive, März 2021. http://dx.doi.org/10.32370/ia_2021_03_18.

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This paper presents the findings of the pilot studies and recommendations for designing of two-hinged wooden arches. The prototype models of wooden arches with the span of 6mand the rise of 1m were designed. The models had a rectangular cross-section of 180x40mm and a T-section of 180x40mm with a plywood plate with the thickness of 6 mm and the width of 500mm. The main objective of the T-section was to ensure the stability of the arch. Each arch was composed of six segments –boards joined by clamping plates. The bowstring truss including two inclined tie bars enables carrying asymmetric loads and provides in-plane stability of the arch. A methodology for laboratory testing of the prototype models of wooden arches subjected to different types of loads was developed. Two prototypes of wooden arches were tested with rectangular cross-sections and two T-section ones subjected to the loading across the span, and two prototypes subjected to the half-span loading. In total, eight arches were tested. Deflections of arches, cross-section deformations and arch thrust force were recorded. The arches were tested until failure. The results of testing revealed insufficient stability of the arches with rectangular cross-section in the horizontal plane. For the arches with T-section the whole arch rib was damaged, the in-plane stability was ensured by the T-section. The collapsing force of the T-section arch was about 1.3 times greater than the collapsing force of the rectangular section arches.
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Nye, C. J. Aleutian Arc Volcanoes. Alaska Division of Geological & Geophysical Surveys, 1995. http://dx.doi.org/10.14509/1678.

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7

Murray, J. G., und G. E. Gorker. Tokamak ARC damage. Office of Scientific and Technical Information (OSTI), Januar 1985. http://dx.doi.org/10.2172/6101616.

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8

Siewert, Thomas A. Control of gas-metal-arc welding using arc-light sensing. Gaithersburg, MD: National Institute of Standards and Technology, 1995. http://dx.doi.org/10.6028/nist.ir.5037.

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9

Jenkins, Theodore M., und W. Ralph Nelson. Synchrotron Radiation in the Collider ARCS. Office of Scientific and Technical Information (OSTI), Juli 2014. http://dx.doi.org/10.2172/1146414.

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10

Nelson, Daniel. Asymptotically Optimal Smoothing with ARCH Models. Cambridge, MA: National Bureau of Economic Research, August 1994. http://dx.doi.org/10.3386/t0161.

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