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Idiosyncratic Spaces and Uncertain Practices: Drawing, Drifting and Sweeping Lines Through the Sand
Get PDFI am sitting on the doorstep of the hotel side door, thinking of thresholds - marginal spaces that provide the kind of ambiguity I need to practice, to disperse, to encounter, to act – not standing for anything certain but renegotiating a relationship with audience; testing out work that is perhaps not “of art” (Duchamp 1913, 105). I pick up on a kind of creative energy found in such settings as abandoned buildings, building sites, cracks, gutters, vacant lots, wind and dust, clefts and fissures, and the crumbling pavement beneath my feet - they offer a useful metaphor for my (our?) uncertain? state of being.
Marcel Broodthaers wrote: "The definition of artistic activity occurs, first of all, in the field of distribution" (Crow, 1996 177). According to Daniel Kunitz (2011 47-52) the lesson of such earlier efforts in the1960’s where art challenged context, is that if you want to disrupt the understanding of what art is, you need to alter how it gets to its audience (see Fig. 7-1) and somehow rupture its first (physical) and second (conceptual) frames (Kosuth, 1977 169-173).
This paper explores the nature and characteristics of a kind of ad hoc drawing practice that emerged during a short residency in Delhi in the autumn of 2014, together with an unofficial offshoot of the main residency programme – a sort of escape. I am reflecting on the possibilities of a practice at the interstices between the individual and the collective, between purpose and play – a kind of non-place. This space is not yet a place, or at least if it once was a place, it has somehow lost its place within the master-plan and is slowly falling away from its institutional configuration (see Fig. 7-2).
The broader project contextualizes the continued value of drawing as an ad hoc, semi-structured method, alongside the tendencies amongst a number of contemporary artists re-examining the status of the art object and questioning its position as highly valued, unique commodity-component as we enter the Age of the Anthropocene.
In order to offer context, the chapter very briefly touches upon artists incorporating their own labour and that of others as the artwork, in relation to traditional forms of object creation for market exchange. The chapter considers the value of ad-hocism and purposeful purposelessness as strategies for developing new approaches to drawing, opening new directions for practice research as an aid to reimaging cultural sites in neglected urban settings such in Delhi (see Fig. 7-3).
The chapter reflects upon the nature and value of specifically improvisational drawing and contouring practices which involved street encounters, sweeping and drifting through the city following the cracks, contours and tears within the urban fabric. Reference is made to precedents in art concerning the function of labour within artistic outputs; problematizing the relationship between art and capital; provisionality; the lasting document; and drawing as a social practice
Crack growth from naturally occurring material discontinuities
Get PDFAll repairs to airframes now need to be assessed as to their effect on the damage tolerance the aircraft. To this end this chapter first discusses difference between the analysis tools needed for ab initio design and aircraft sustainment. It is shown that using small or physically short-crack da/dN versus Δ K data results in reduced through life costs and increased aircraft availability. The tests procedures needed to validate composite or supersonic particle deposition (SPD), repairs to operational aircraft are also discussed as is their relationship to the ASTM fatigue test standard E647-13a. This leads to an examination of the problem of crack growth from small naturally occurring material discontinuities under operational load spectra. A range of tools are available to account for crack growth in operational aircraft and several such tools are discussed, viz.: cycle-by-cycle analysis; the USAF characteristic K approach, etc. Specific attention is paid to the growth of lead cracks in operational aircraft which are shown to exhibit near exponential crack growth and to essentially have a cubic dependency on stress. It is shown that cracks growing in composite repairs exhibit the same crack length and stress dependency. This finding is then linked to current approaches which use the cubic rule to assess repairs to RAAF aircraft
A method of determining the maximum performance torque-speed characteristic for an induction motor drive over its entire speed range
Get PDFThis paper discusses a simple and efficient method of determining the maximum performance torque-speed characteristic for an induction motor drive. The proposed method considers the voltage and current constraints of the inverter supply for the drive. The mathematical description of the motor in DQ reference frames was adapted to build a model applicable for numeric calculation. It has been shown that the torque-speed characteristic has 3 operating speed regions. The optimal relationship between the magnetisation and q-axis currents is derived for the third speed region. The model performs tracking of the magnetisation current in order to keep the output voltage and current under the limits of the inverter. In addition, the proposed model provides a method of calculation for the output power, the apparent power, the power factor and the efficiency vs speed. The proposed method is applicable for the analysis of the induction motor drive operating over its entire speed range
Housing estate energy storage feasibility for a 2050 scenario
Get PDFThe further penetration of renewable sources in the grid requires the implementation of energy storages in order to smooth out the variability and intermittent nature of renewables. This paper looks at the possibilities for a storage solution to meet an unprecedented situation of having no power input from renewables or an outage from grid sources for five consecutive days in the highest demand period of the year. The study uses as test case a 1000 house estate in the year 2050 with each property using electrical heating and electrical vehicle charging. The magnitude of power and energy estimated, together with the practicalities is then used to assess current storage solutions suitability and the likely possibilities of new innovations in the storage environment
Crack growth: Does microstructure play a role?
Get PDFThe experimental data presented in this paper reveals that even if the growth of long cracks in two materials, with different microstructures, have different
da/dN
versus
ΔK
curves the corresponding small crack curves can be similar. We also see that long cracks in a large range of steels with different microstructures, chemical compositions, and yield stresses can have similar crack growth rates. The materials science community is challenged to explain these observations. The experimental data also suggests that the threshold term
ΔKthr
in the Hartman-Schijve variant of the NASGRO crack growth equation appears to have the potential to quantify the way in which small cracks interact with the local microstructure. In this context it is also noted that the variability in the life of operational aircraft is controlled by the probability distribution associated with the size and nature of the material discontinuities in the airframe rather than the probability distribution associated with the scatter in the growth of small cracks with a fixed initial size
WR-3 Waveguide Bandpass Filters Fabricated Using High Precision CNC Machining and SU-8 Photoresist Technology
Get PDFThis paper presents two WR-3 band (220-325 GHz) filters, one fabricated in metal using high precision computer numerically controlled milling and the other made with metallized SU-8 photoresist technology. Both are based on three coupled resonators, and are designed for a 287.3-295.9-GHz passband, and a 30-dB rejection between 317.7 and 325.9 GHz. The first filter is an extracted pole filter coupled by irises, and is precision milled using the split-block approach. The second filter is composed of three silver-coated SU-8 layers, each 432 μm thick. The filter structures are specially chosen to take advantage of the fabrication processes. When fabrication tolerances are accounted for, very good agreement between measurements and simulations are obtained, with median passband insertion losses of 0.41 and 0.45 dB for the metal and SU-8 devices, respectively. These two filters are potential replacements of frequency selective surface filters used in heterodyne radiometers for unwanted sideband rejection
Image Matching Principles in Photometrical Transformations
Get PDFIn this article interactive visualization techniques for creating virtual objects are considered. We describe the most common methods of photometric transformations between images and a variety of geometric objects contextualized against the backdrop of increased adoption of 360 videos and virtual reality systems. Two techniques, the Harris-Laplacian and the Scale Invariant Feature Transform (SIFT) have been described. The algorithm estimation of virtual objects interactive visualization is given. The image-matching algorithm using key points is described
An Approach to Identification of Dynamic Plants Described by Irrational Transfer Functions
Get PDFIn this paper one of approaches to parametric identification of plants with distributed parameters is considered. The approach is based on the exponential modulation method (EMM). This method, originally developed for objects with lumped parameters and described by rational transfer functions, is extended for identification of plants described by irrational transfer functions. As an example, the process of radiation heating of the solid is considered for various boundary conditions. Identification is carried out according to the noisy transition processes. The comparison of the transients at the outputs of the object and model is given
The Exploration of Body-Worn Video to Accelerate the Decision-Making Skills of Police Officers within an Experiential Learning Environment
Get PDFPrevious research has highlighted benefits of body-worn video (BWV) to support the work of police officers. The daily demands of policing require officers to make highly pressurized decisions (with associated rapid action) in unpredictable changing environments. It is important that new officers learn techniques of decision-making in a safe and controlled way, which minimizes the risk and harm to all parties while at the same time facilitating effective learning. While the benefits of experiential and immersive learning characterized by active participation have long been used in related professional disciplines, the application to police education has been under-explored. BWV can be used to identify decision-making cues from the environment and nurture pattern recognition, essential to the development of mental models within the officer’s decision-making process. The article will therefore explore the application of BWV in the context of experiential immersive learning to accelerate police officers’ decision-making
Internal Model Control of a Domestic Microwave for Carbon Composite Curing
Get PDFThis paper outlines the conversion of a domestic microwave oven for use in composite curing applications. It compares several strategies for temperature control. The converted oven has vacuum ports, connectors, and fiber optic thermocouple sensors. Experimental data are provided for each control strategy based on a 200 mm× 200 mm eight-ply prepreg laminate. The degree of cure is established for the test samples by thermal analysis techniques. Multiphysics simulation is used to model the electromagnetic and heating effects in the system, and a common and inexpensive method of approximating the available microwave power is used. The low cost of the microwave components and the ease of conversion are desirable characteristicsin this application