Experimental constraints on fluid-rock reactions during incipient serpentinization of harzburgite
Klein, Frieder
2014-10-20
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A survey has been made to determine the
factors influencing the design of a precision
turning machine with limited milling facilities.
Seventy six replies were received, have
been analysed and histograms plotted and from
an analysis of this information a technical
specification has been compiled for the machine.
An apparatus is described for precise measurement of
creep properties in specimens with gauge lengths down to 1.2
cm. An extensometer has been developed which is supported
independently of the specimen and exerts a load on the specimen
of less than 5 grams. It can thus be used with small non-rigid
specimens. The extensometer will detect strains down to
2 x 10-6. The stability is excellent. An adaptation of the
system which allows simultaneous measurement of tensile strain
and lateral strain during creep is also described. The apparatus
was designed for the measurement of anisotropy of creep
properties in oriented thermoplastics and reference to such
measurements is given. It is however entirely suitable for
general application to small specimens.
Bird strikes represent a major hazard to the aerospace composite structures, due to their low impact resistance. Accurate selection and lay up of the materials in the composite structure can significantly improve the out of plane properties of the composites. However, application of the complex hybrid sandwich composites into bird strike proof structures was not investigated yet. Therefore, this work was focused on the soft body impact resistance of a novel composite design for aerospace applications. The investigation was divided into experimental and modelling parts.
In the beginning of this thesis, the numerical techniques for modelling of bird im¬pact and composite materials were studied. The theoretical background for the corresponding issue was provided, followed by the thorough validation of the exist¬ing numerical approaches.
A...
The fracture of water ballast tank (WBT) coatings due to thermal stresses is widely
recognised as an issue. Upon coating fracture, rapid corrosion of the tanker steel
structure will occur, leading to expensive structure repairs or even tanker scrapping. In
this project, the fracture behaviour of two experimental WBT coatings, referred to as A
and B, in the forms of free film and substrated coatings was investigated. Static tensile
tests and fatigue tests of the substrated coatings were performed. A finite element model
of coating cracking was developed. Thermal stress and J-integral of surface cracking
defects in substrated coatings were calculated using the model, in which the effects of
defect size, coating thickness, and thermal strain on coating fracture were investigated.
For the first time, fracture mechanics was used to explain ...
With a growing body of literature examining HR systems’ influence on organizational
performance outcomes, there has been a plea for research that examines the underlying
mechanisms that facilitate this in a service setting. This study adopts the notion of people
management which incorporates the management of HR implementation and line managers’
leadership behaviour in its investigation of how HR affects performance. This study, by
examining how frontline employees’ perception of people management practices affects
individual level prosocial service behaviours, and by using a qualitative approach in data
collection and analysis, offers an explanation of the underlying mechanisms in the causal chain.
Furthermore, the setting of this research in an employee-owned organization affords a context-
rich account of how HR systems affect indiv...
This chapter presents modeling and simulation of a complex multistage multiproduct production line with four closed loop networks configuration, which also act as a virtual cell. This allows for a greater understanding of the functions within the production line through the simplification of the production flow with the addition of buffers between the cells. Virtual cells are crucial in this instance due to the dynamic configuration, which could help production system designers in optimizing the complex configuration of production.
Hydrology is yet to fully understand the role that catchment characteristics have in
determining a river’s response to precipitation variability. This thesis assesses the
influence that catchment characteristics have on modulating a river’s response to changes
in precipitation throughout the UK. Central to this aim is the concept of the precipitation-
to-flow relationship (the transformation of precipitation into river flow), which is
characterised using the Variogram, a way of indexing temporal dependence (i.e. the
average relationship between river flow on a given day and river flow on the previous
days). Firstly, 116 catchments were grouped into four clusters, based on the shape of their
variogram, which significantly differed in their catchment characteristics demonstrating
that catchment characteristics control how, on average, pr...
This paper explores the Fuzzy Front-End (FFE), i.e. the first phase of the Product Design and Development process where a company formulates a product concept to be developed and decides whether or not to invest resources in the further development of an idea. Our goal is to understand how companies leverage supply chain capabilities to improve product design opportunities in order to obtain optimized product concepts in the FFE. From the analysis of our pilot study, the results suggest that FFE is organized differently depending on design requirements and supply chain capabilities and that matching design requirements with supplier capabilities during the FFE improves performance. Therefore, the findings indicate that the proposed Conceptual Framework has the potential to be used by companies to design their FFE and to enhance the use...
In this study, we summarise the requirements for collaborative product development based on our investigation of the differences in the resources and tools that are needed for the various stages of collaborative product development and the needs of system users during these various stages. We proposed a user-oriented approach of collaborative product development for medical equipment and designed a collaborative product development system with the required functionalities to satisfy different areas according to their roles and workflow. The system we developed can drastically simplify the original complex and dispersed process of product development for intelligent medical equipment, thereby allowing the project team to develop new medical-equipment products and promote interactions among the research and development staff, clinical sp...
This report presents the results of experimental
measurements of the damping derivative coefficient zw for
constant chord rigid wings of various aspect ratios having
sweepback angles of zero and 450.
The results for the rectangular wings Flow substantial
agreement with the unsteady aerofoil theory developed
by TI.P. Jones $2) The dependence of Zvi upon frequency parameter
is as given by theory and is much less than for two dimensional
flow, but the numerical results are approximately
10 per cent below the theoretical. This is attributed to the
large trailing edge angle 22° of the N.A.C.A. 0020 section
used for the model aerofoils.
The effect of sweepback is to decrease the numerical
value of z , but this effect is much less pronounced, for low
than for high aspect ratios. For aspect ratios 5 and 3
the numerical value is greater than wo...
