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Systematic Tests (systematic + test)
Selected AbstractsSyntactic Iron Foams with Integrated Microglass Bubbles Produced by Means of Metal Powder Injection Moulding,ADVANCED ENGINEERING MATERIALS, Issue 7 2010Jörg Weise Systematic tests for the production of pure iron (99%) foams with integrated microglass bubbles by means of metal powder injection moulding (MIM) have been carried out with variation of the glass bubble contents. Process parameters were optimized and the resulting materials characterized using density measurements, tensile and compression tests, metallographic sections, and scanning electron microscopy. The corrosion behavior of this novel material was characterized using potentiodynamic polarization measurements and immersion tests. [source] Sailing the Bremen CogINTERNATIONAL JOURNAL OF NAUTICAL ARCHAEOLOGY, Issue 2 2009Gabriele Hoffmann The 14th-century Bremen Cog is the only near-complete representative of a type of large ship with a single square-sail which dominated North European waters for c.200 years. The evaluation of sailing properties, seaworthiness, potential and characteristics of two replicas is made by professional seamen who have taken them to their limits. Their judgements need to be recorded now, or they will be forgotten especially as systematic tests and sea-trials have been limited and documentation lost. The replicas' captains' expert opinion on the Bremen Cog as a sea-going vessel is a rare case of long-term evaluation of a large-scale experimental-archaeology project. © 2009 The Authors [source] TOP: a new method for protein structure comparisons and similarity searchesJOURNAL OF APPLIED CRYSTALLOGRAPHY, Issue 1 2000Guoguang Lu In order to facilitate the three-dimensional structure comparison of proteins, software for making comparisons and searching for similarities to protein structures in databases has been developed. The program identifies the residues that share similar positions of both main-chain and side-chain atoms between two proteins. The unique functions of the software also include database processing via Internet- and Web-based servers for different types of users. The developed method and its friendly user interface copes with many of the problems that frequently occur in protein structure comparisons, such as detecting structurally equivalent residues, misalignment caused by coincident match of C, atoms, circular sequence permutations, tedious repetition of access, maintenance of the most recent database, and inconvenience of user interface. The program is also designed to cooperate with other tools in structural bioinformatics, such as the 3DB Browser software [Prilusky (1998). Protein Data Bank Q. Newslett.84, 3,4] and the SCOP database [Murzin, Brenner, Hubbard & Chothia (1995). J. Mol. Biol.247, 536,540], for convenient molecular modelling and protein structure analysis. A similarity ranking score of `structure diversity' is proposed in order to estimate the evolutionary distance between proteins based on the comparisons of their three-dimensional structures. The function of the program has been utilized as a part of an automated program for multiple protein structure alignment. In this paper, the algorithm of the program and results of systematic tests are presented and discussed. [source] SHAPE OF THINGS: UNDERSTANDING A LOOM WEIGHTOXFORD JOURNAL OF ARCHAEOLOGY, Issue 4 2009LINDA MÅRTENSSON If there is one thing to be learnt from watching people work in old traditional crafts it is this: The tools and the working procedures are never clumsy, never impractical (Hoffmann 1988) Summary Loom weights are common finds in archaeological excavations in Europe and the Near East. They represent the only remains of warp-weighted looms. The function of the warp-weighted loom is well known from ethnographic studies. The function of loom weights, however, has not been investigated and cannot be deduced directly from ethnographical data, since loom weights in antiquity were very different from those used in the twentieth century AD. This paper reviews the functional elements of a loom weight. The weight and thickness of loom weights are established as the defining functional parameters for the operation of the warp-weighted loom. A series of systematic tests demonstrated that the weight of a loom weight defines what yarn to use and the thread density. The thickness of a loom weight, and thus the width of the row of loom weights hanging closely together, defines the width of a fabric and , together with the weight of the loom weight , the thread count and density of the fabric. This new knowledge provides the methodological framework for archaeologists to calculate textile production possibilities from any given loom weight, as long as the weight and thickness are preserved. Furthermore, it allows scholars to assess textile production on sites where no textiles are preserved. [source] | ||||||||||