Examination of the Effect of Time Delay on Fragmentation

The main objective of blasting is to produce optimum fragmentation for downstream processing. Fragmentation is usually considered optimum when the average fragment size is minimum and the fragmentation distribution as uniform as possible. One of the parameters affecting blasting fragmentation is believed to be time delay between holes of the same row. Although one can find a significant number of studies in the literature, which examine the relationship between time delay and fragmentation, their results have been often controversial. The purpose of this work is to increase the level of understanding of how time delay between holes of the same row affects fragmentation. Two series of experiments were conducted for this purpose. The first series involved tests on small scale grout and granite blocks to determine the moment of burden detachment. The instrumentation used for these experiments consisted mainly of strain gauges and piezoelectric sensors. Some experiments were also recorded with a high speed camera. It was concluded that the time of detachment for this specific setup is between 300 and 600 μs. The second series of experiments involved blasting of a 2 meter high granite bench and its purpose was the determination of the hole-to-hole delay that provides optimum fragmentation. The fragmentation results were assessed with image analysis software. Moreover, vibration was measured close to the blast and the experiments were recorded with high speed cameras. The results suggest that fragmentation was optimum when delays between 4 and 6 ms were used for this specific setup. Also, it was found that the moment at which gases first appear to be venting from the face was consistently around 6 ms after detonation.

“ The Creation of an Urban Landscape” in Adaptive reuse,the modern movement toward the future, 14th international conference proceedings, Do_co.mo.mo international, Lisboa ( indexed by SCOPUS)

The headquarters and park of the Calouste Gulbenkian Foundation in Lisbon represent the first modern Portuguese environment with an outstanding relation between exterior and interior as a spatial continuum . As such, the project refused the more common conceptual attitude of interior plus exterior. This unitary view revealed a clear understanding of the proposed site for the project and what could have been Calouste Sarkis Gulbenkian (1869-1955) expectations, while concretizing Modern Movement ideals regarding landscape architecture and architecture. Through its design the park mediates the relation between the buildings’ super-structures, the urban context, and the human scale, while generating a unifying system established by the complicity between natural and synthetic materials. From the first moment of the project’s design process, this complicity resulted in a set of strategies that met programmatic

Hyperhoneycomb Iridate β-li_{2}iro_{3} As A Platform For Kitaev Magnetism.

A complex iridium oxide β-Li_{2}IrO_{3} crystallizes in a hyperhoneycomb structure, a three-dimensional analogue of honeycomb lattice, and is found to be a spin-orbital Mott insulator with J_{eff}=1/2 moment. Ir ions are connected to the three neighboring Ir ions via Ir-O_{2}-Ir bonding planes, which very likely gives rise to bond-dependent ferromagnetic interactions between the J_{eff}=1/2 moments, an essential ingredient of Kitaev model with a spin liquid ground state. Dominant ferromagnetic interaction between J_{eff}=1/2 moments is indeed confirmed by the temperature dependence of magnetic susceptibility χ(T) which shows a positive Curie-Weiss temperature θ_{CW}∼+40  K. A magnetic ordering with a very small entropy change, likely associated with a noncollinear arrangement of J_{eff}=1/2 moments, is observed at T_{c}=38  K. With the application of magnetic field to the ordered state, a large moment of more than 0.35  μ_{B}/Ir is induced above 3 T, a substantially polarized J_{eff}=1/2 state. We argue that the close proximity to ferromagnetism and the presence of large fluctuations evidence that the ground state of hyperhoneycomb β-Li_{2}IrO_{3} is located in close proximity of a Kitaev spin liquid.

Definição de shelf life para produtos químicos: a importância de um guia de estabilidade específico para o segmento

The chemical industries worldwide are passing through a very particular moment of re-adaptation due to the implementation of an European regulation called, Registration, Evaluation, Authorization and Restriction of Chemicals (REACH). In Brazil, the Brazilian Chemical Industry needs urgently a specific guide of chemical products stability. The main purpose of this work is to present a proposal of a guide of stability for chemical products based on the reference guides of the International Conference on Harmonization (ICH). Thus, this work proposes an innovation in terms of methodology which will be useful for shelf life definition purpose for chemical industry products.

A educação física na educação infantil e as relações de gênero : educando crianças ou meninos e meninas?

Universidade Estadual de Campinas . Faculdade de Educação Física

Esporte e clube sócio-esportivo : percurso, contextos e perspectivas a partir de um estudo de caso em clube esportivo espanhol

Universidade Estadual de Campinas . Faculdade de Educação Física

Significados do taiko no Instituto Cultural Nipo Brasileiro de Campinas

Universidade Estadual de Campinas . Faculdade de Educação Física

Determinação da velolcidade critica como referencia do limiar anaerobio para o nado costas

Universidade Estadual de Campinas . Faculdade de Educação Física

Metodologia para descrição da orientação do corpo humano

Universidade Estadual de Campinas. Faculdade de Educação Física

Aspectos epidemiologicos das lesões desportivas no voleibol

Universidade Estadual de Campinas . Faculdade de Educação Física

O clown visitador no tratamento de crianças hospitalizadas

Universidade Estadual de Campinas. Faculdade de Educação Física

Educação fisica na educação infantil : concepções e praticas de professores

Universidade Estadual de Campinas. Faculdade de Educação Física

Amarrações e arrumações na inclusão escolar do município de Hortolândia - SP

Universidade Estadual de Campinas. Faculdade de Educação Física

Bem-vinda à escola : o ingresso da criança no primeiro ano do ensino fundamental sob o olhar docente e a perspectiva do brincar

Universidade Estadual de Campinas . Faculdade de Educação Física

Proposta de avaliação da simetria e transferencia de peso e a relação dessa condição com a atividade funcional do hemiplegico

Universidade Estadual de Campinas . Faculdade de Educação Física