2,263 research outputs found
A combined experimental and numerical approach to the investigation of the influence of geometry on residual stresses in structural glass
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An experimentally validated contour method/eigenstrains hybrid model to incorporate residual stresses in glass structural designs
No full textContour method-based finite element (FE) models together with knowledge of the surface deformation resulted from the stress relaxation along a newly cut plane were used to construct the residual stresses in commercially available float glass. The results show that the residual stress depth profile of float glass is parabolic. The constructed residual stress profiles, validated to some extent against results of scattered-light-polariscope (SCALP) experiments, were then used to establish the misfit strains (i.e. eigenstrains) existed in the original glass specimens. It is shown that, despite the modelling uncertainty of the contour method and the limitations associated with the SCALP measurements, the eigenstrain depth profile in a given float glass specimen can be determined to an acceptable accuracy. The paper shows that once the underlying eigenstrain distribution in a given thickness of glass has been determined, the complete residual stress distribution can simply be determined by incorporating the eigenstrain profile as a misfit strain in an appropriate FE model. It is also shown that the hybrid contour/eigenstrain model enables modelling the residual stress around stress concentration features such as holes and/or stress evolution during subsequent applied loadings, by simply using the knowledge of eigenstrains
Millettia pulchra var. munnarensis Balan & Predeep 2017
No full textM. pulchra var. munnarensis Recently, Balan et al. (2017) described another new taxon of Millettia with large and violet flowers, i.e. M. pulchra (Bentham 1852: 248) Kurz (1873: 69) var. munnarensis Balan & Predeep (2017: 97). Millettia pulchra is a complex species widely distributed from Northeast India to Southern China, and includes seven varieties that hardly distinguished from each other (Wei & Pedley 2010, Song et al. 2017). The authors suggested that this new variety is strikingly different from all the other varieties of M. pulchra in having large flowers (2.8 cm long) and pods with 8–10 seeds. It is noted that the holotype and isotypes of this new variety was collected from Munnar, Idukki District, Kerala, South India (S.V. Predeep 20986, Fig. 1: C–D), where is far away from the geographic distribution of all the other varieties of the species (see Map 1 in Balan et al. 2017), but is very near to the type locality of M. pseudoracemosa. In fact, examination of literature and specimens showed that M. pulchra var. munnarensis is quite similar to M. pseudoracemosa in morphology and distribution. Furthermore, when comparing with all the other species of Millettia from India recorded in the literature (Table 1), both M. pseudoracemosa and M. pulchra var. munnarensis cannot be distinguished from M. dura Dunn in various characters, including habit, shape, number and hairiness of leaflets, inflorescence type, size and color of flower, and shape and size of pod (Table 2). Millettia dura was validly published by Dunn (1911), although he just give a simple Latin diagnosis in a key to species. One year later, Dunn (1912) provide a full Latin description and eight collections from Africa, including three gatherings collected by M. T. Dawe (# 452, Fig. 2A; # 459; # 481, Fig. 2B) in 1905 from Toro, western Uganda. Some seeds from one of type localities were sent by M. T. Dawe to Kew Royal Botanic Garden at that time. Based on living plants raised from these seeds at Kew, a beautiful colored drawing was published as tab. 8959 in the Curtis’s Botanical Magazine (Stapf 1923; Fig. 2: C–D). These materials are very important for understanding of this taxon, thus a specimen collected by Dawe with a better preservation, i.e. M. T. Dawe 481 (K000263154), is designated here as the lectotype.Published as part of Song, Zhu-Qiu, 2023, The identities of Millettia pseudoracemosa and M. pulchra var. munnarensis (Fabaceae: Millettieae) from South India, pp. 55-63 in Phytotaxa 591 (1) on page 56, DOI: 10.11646/phytotaxa.591.1.5, http://zenodo.org/record/778427
H/D isotopic fractionation between minerals and water, as predicted by first-principles calculations
No full textisotopic fractionation between minerals and water, as predicted by first-principles calculations
Assessment of stresses in float and tempered glass using Eigenstrains
No full textResidual stress data determined using the contour method has been used to determine the misfit-strains (i.e., eigenstrains) existent in float glass. Although the uncertainty associated with the results of the contour method analysis may be high the results agree with the residual stress profiles measured using scattered-light-polariscope experiments. The relationship between the eigenstrains and the thickness of glass has been investigated and the results have been validated using scattered-light-polariscopic experiments. The paper shows that the eigenstrain distribution depends on the differential cooling takes place during the manufacturing process. Once the underlying eigenstrain distribution in a given float glass product has been determined this can be used to devise the eigenstrain distribution in tempered glass. It is also shown that eigenstrain analysis can be implemented in finite element models to predict structural response of glass structures thereby to ensure efficient, safe and reliable designs
Zercon sklari Balan
No full textZercon sklari Balan Zercon sklari Balan, 1992: 26. Zercon sklari.— Karaca & Urhan, 2014: 148. Materials examined. 1 female, soil and litter samples under pine trees (Pinus sp.) and oak trees (Quercus sp.), 41 ° 44 ' N, 27 ° 19 ' E, 370 m, vicinity of Yundalan village Dam, Centre of Kırklareli province, March 2014; 12 females and 5 males, soil, litter and moss samples under oak trees (Quercus sp.), 41 ° 29 ' N, 27 ° 12 ' E, 133 m, vicinity of centre of district, Babaeski district (Kırklareli province), April 2014. Female. Mean length of idiosoma 387 (372–401), mean width 294 (277–309) (n = 10). Dorsum. Twenty pairs of setae present on podonotum: j-row with six pairs, z-row with two pairs, s-row with six pairs and r-row with six pairs. Seta j 1 long and finely barbed, remaining setae on podonotum smooth and needle-like. Twenty pairs of setae present on opisthonotum: J-row with six pairs, Z-row with five pairs, S-row with two pairs and R-row with seven pairs. Setae J 1 –J 3, Z 1 –Z 2, S 1 –S 2 and R 1 –R 7 smooth and needle-like. Seta J 4 finely barbed, J 5 and Z 3 apically pilose, J 6 and Z 4 brush-like and finely barbed, all with hyaline ending. Seta Z 5 short and finely barbed. Except seta J 6, no setae reach beyond opisthonotum. Setae S 3 and S 4 absent. Podonotum covered with irregular tile-like pattern. Anterolateral parts covered with tile-like pattern, anteromedial parts covered with finely punctate pattern as opisthonotum. Dorsal cavities distinct, equal in size, axes parallel to that of the body. Pores. Pore po 1 located on line connecting setae j 2 –s 1, po 2 located on line connecting setae j 5 –s 4 (closer to seta s 4), po 3 inside a line connecting s 5 –s 6. Pore Po 1 above the base of seta Z 1, Po 2 located on line connecting setae Z 1 –S 2 (closer to seta S 2), Po 3 located on line connecting setae J 5 –Z 3 and Po 4 below the base of seta Z 4. Venter. Shapes of ventral shields and peritremes, and chaetotaxy are typical for genus Zercon. Two pairs of setae present on ventral side of podonotum. Setae p 1 short, smooth and needle-like, p 2 long, finely plumose, feather-like with hyaline ending. Peritremes slightly bent. Lateral ends of peritremal shield reaching to seta R 1. Adgenital shields present (with two opening valves). Ventrianal shield with nine pairs of setae. Anterior margin of ventrianal shield with four setae and unpaired postanal seta, all short, smooth and needle-like. Male. Mean length of idiosoma 324 (312–334), mean width 233 (227–239) (n = 5). Dorsal idiosoma, ventral idiosoma, shape of setae on idiosoma, sculpture of podonotum and opisthonotum, size and appearance of dorsal cavities, basically similar to those of female. Distribution. Ukraine (Balan, 1992) and Turkey (Karaca & Urhan, 2014). Remarks. Average lengths of opisthonotal setae and distances between setae within longitudinal rows of females and males specimens: see Table 8. Only a single male specimen of this species was recorded from Edirne province previously. We now record and describe female specimens from Turkey for the first time.Published as part of Karaca, Mehmet & Urhan, Raşit, 2016, Five new species of Zercon C. L. Koch, 1836 (Acari: Zerconidae) from northwestern Turkey, pp. 31-59 in Zootaxa 4127 (1) on page 47, DOI: 10.11646/zootaxa.4127.1.2, http://zenodo.org/record/27176
A evolu??o da balan?a comercial na economia brasileira
No full textThis research had as objective to analyze the behavior and the evolution of the Brazilian Trade Balance about the different economic policies adopted between 1990 and 2010. The methodology starts with the documentary method, predominantly qualitative, and analyzes and interprets the behavior of exports and imports Brazil in the time period. The research presents graphs showing the positive or negative
evolution of the trade balance for each period, with documentary references explaining the behavior of exports and imports, in the face of the Balance of Payments, Foreign Exchange and Inflation and Privatization. In the light of this, it is concluded that the evolution of the Trade Balance had prioritized the stabilization of the economy and consequently affected exports and imports and the Brazilian trade balance. The main reason for this trend is connected to the economic policies adopted by the governments from 1990 to 2010, and it is also remarkable that movements of both domestic and foreign economy altered the balance of the Brazilian Trade Balance.Essa pesquisa teve como objetivo analisar o comportamento e a evolu??o da Balan?a Comercial Brasileira em rela??o ?s diferentes pol?ticas econ?micas adotadas entre 1990 e 2010. A metodologia parte do m?todo documental, predominantemente qualitativa, os dados ser?o analisados e interpretados a partir do comportamento das exporta??es e importa??es brasileiras no per?odo de 1990 a 2010, com exibi??o de gr?ficos para demonstrar a evolu??o positiva ou negativa da balan?a comercial para cada per?odo, com refer?ncias documentais explicando o comportamento das exporta??es e importa??es, diante do Balan?o de Pagamentos, do C?mbio e Infla??o e das Privatiza??es. De acordo com isso, conclui-se que houve evolu??o da Balan?a Comercial diante das pol?ticas econ?micas adotadas pelos governos de 1990 a 2010, priorizando a estabiliza??o da economia e consequentemente afetando as exporta??es e importa??es e o saldo comercial brasileiro, constatando que toda movimenta??o da economia interna e externa afetou o saldo da Balan?a Comercial Brasileira
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