Some aspects of the cold compaction behaviour of metal powders

An analytical appraisal has been made of the cold compaction behaviour of a series of metal powders of different geometry, crystallographic and metallurgical structure, variable size and size distribution. The powders were pressed isostatically to eliminate die-wall friction effects arising from the more common method of die compaction used industrially. [Continues.

Developments in Random Matrix Theory

In this preface to the Journal of Physics A, Special Edition on Random Matrix Theory, we give a review of the main historical developments of random matrix theory. A short summary of the papers that appear in this special edition is also given.Comment: 22 pages, Late

Experimental and theoretical study for development of an improved reinforced flexible window Final report, 19 Dec. 1967 - 11 Jul. 1969

Flexible transparent window for expandable space structur

The Constitution of Liquid Slags

1. A rotating cylinder viscometer has been designed and constructed for the measurement of the viscosity of liquid slag at various rates of shear up to a temperature of 160

A complex network approach to stylometry

Statistical methods have been widely employed to study the fundamental properties of language. In recent years, methods from complex and dynamical systems proved useful to create several language models. Despite the large amount of studies devoted to represent texts with physical models, only a limited number of studies have shown how the properties of the underlying physical systems can be employed to improve the performance of natural language processing tasks. In this paper, I address this problem by devising complex networks methods that are able to improve the performance of current statistical methods. Using a fuzzy classification strategy, I show that the topological properties extracted from texts complement the traditional textual description. In several cases, the performance obtained with hybrid approaches outperformed the results obtained when only traditional or networked methods were used. Because the proposed model is generic, the framework devised here could be straightforwardly used to study similar textual applications where the topology plays a pivotal role in the description of the interacting agents.Comment: PLoS ONE, 2015 (to appear

An investigation of Ikat weaving and warp printing and their application to contemporary design

This work seeks to consider the contribution that Ikat weaving and warp printing could make to contemporary textile design. To do this the research first considered the historical background to Ikat weaving and warp printing by examining'the visual and structural characteristics involved and the definitions used historically. Then by studying in some detail the methods of manufacture, dyestuffs, and design imagery of warp Ikats from South America and Central Asia, and weft and double Ikats from Indonesia and Japan a particular was made with a detailed study comparison of these Ikat techniques in The first volume of this work concluded with a detailed study of warp, weft and double Ikats in Japan. From this historic basis and analysis of the various techniques used experiments were devised to understand more clearly the effect of fibre, structure, colouration, warp design and its positioning on the image produced in the fabric. In investigating this a series of practical experiments was carried out on warp printed wool, cotton and silk fabrics and measurements made of the effects of the variables. These results were used to undertake a second series of experiments using slub weft yarns, warp printed silk and warp printed cotton fabrics made from a double warp. The work established from an historical viewpoint that the Ikat weavers were familiar and well practised within the traditional design limits of their craft but that these limits were differently defined for the various types of Ikat produced throughout the world. From the technological experiments the factors controlling the image, its size, position. and effect were determined so that ultimately exemplar design effects were created which suggested ways in which this technique could be developed in the future

Analytical techniques and instrumentation: A compilation

Technical information is presented covering the areas of: (1) analytical instrumentation useful in the analysis of physical phenomena; (2) analytical techniques used to determine the performance of materials; and (3) systems and component analyses for design and quality control

Morphometry of subaerial shield volcanoes and glaciovolcanoes from Reykjanes Peninsula, Iceland: Effects of eruption environment

We present a morphometric study of 33 basaltic volcanic edifices from the Reykjanes Peninsula, Iceland, using a 20 m resolution digital elevation model (DEM). Slope values distinguish subaerial from intraglacial eruption environments, with glaciovolcanic edifices having average slope values that are > 5° higher than subaerial shields. The 26 analyzed glaciovolcanic edifices are separated into 3 groups based on size, and are also categorized following the new classification scheme of tuyas by Russell et al. (2014), into 15 tindars, 1 conical tuya, 3 flat-topped tuyas and 7 complex tuyas. The glaciovolcanic edifices show a continuum of landforms ranging from small elongated tindars to large equidimensional flat-topped tuyas. The smaller edifices ( 0.1 km3) are flat-topped tuyas. The mid-sized edifices (0.01–0.1 km3) show a wide variety of shapes and classify either as tindars or as complex tuyas, with only one edifice classifying as a conical tuya. Edifice elongation tends to decrease with volume, suggesting that small edifices are primarily fissure controlled, whereas larger edifices are mainly controlled by a central vent. The mid-sized complex tuyas are transitional edifices, suggesting that some intraglacial eruptions start as fissure eruptions that subsequently concentrate into one or more central vents, whereas the mid-sized tindars suggest a sustained fissure eruption. There is a tectonic control on the orientation of the edifices evidenced by a strong correlation between edifice elongation azimuth and mapped faults and fractures. Most edifice elongations cluster between 020° and 080°, coinciding with the strike of normal faults within and at the boundary of regional volcanic systems, but some edifices have elongations that correlate with N–S striking book-shelf faults. This implies that intraglacial eruptions are controlled by pre-existing pathways in the crust, as has been previously observed for subaerial fissure eruptions. In terms of classification, quantification of the limits between the four tuya types proposed by Russell et al. (2014) is difficult because of the transitional nature shown by several edifices. A threshold of 1.8 in ellipticity index (E.I.) values can be used to distinguish tindars from the other three types. Flat-topped tuyas are distinguished by their greater overall size, their large and relatively flat summit regions, reflected in bimodal slope distributions, and their low E.I. and low to intermediate irregularity index (I.I.) values. The only analyzed conical tuya has very low E.I. and I.I. values, very small summit regions and very steep flank slopes. The complex tuyas have variable morphometries, but are in general characterized by high I.I. values and very irregular slope distributions. No correlation is observed between edifice-scale morphology and lithology (e.g. pillow dominated or hyaloclastite dominated).Fil: Pedersen, G. B. M.. University of Iceland. Institute of Earth Sciences. Nordic Volcanological Center; IslandiaFil: Grosse, Pablo. Fundación Miguel Lillo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Tucumán; Argentin