950 research outputs found
Reddall Estate, close to Regents Park Station [cartographic material] : junction of proposed railway extension of Regents Park, Enfield & Bankstown lines to Canley Vale /
No full textSales plan for land bounded by Hills, Central and Auburn Roads, and Stephenson Street, Regents Park (now part of Birrong), New South Wales. Includes local sketch.; Dated from presence of Bankstown railway station (opened 1909) and proposed extension (completed 1928) to Regents Park station.; "Torrens title".; "Hardy & Busby, licensed surveyors under R.P.A., 375 George St., Sydney".; "Arthur Muddle, solicitor to the estate, 4 O'Connell St., Sydney".; "Easy terms, viz, 3 deposit per lot, the balance extending over 4 years at 6% per annum".; Also available in an electronic version via the internet at: http://nla.gov.au/nla.map-lfsp2321
Junction Estate, close to Regents Park Station [cartographic material] : junction of proposed railway extension of Regents Park, Enfield and Bankstown lines to Canley Vale /
No full textSales plan for land on Beatty Avenue and Auburn Road, Regents Park, New South Wales. Includes local sketch.; Dated from presence of Bankstown railway station (opened 1909) and proposed extension (completed 1928) to Regents Park station.; "Title will be Torrens".; "Hardy & Busby, licensed surveyors under R.P.A., 375 George St., Sydney".; "Arthur Muddle, solicitor to the estate, 4 O'Connell St."; "Easy terms, viz, 3 deposit per lot, the balance extending over 4 years at 6% per annum".; Also available in an electronic version via the internet at: http://nla.gov.au/nla.map-lfsp2320
Thermal analysis of the Wire and Arc Additive Manufacturing process using the F.E. method
No full textIn this research, a thermal analysis of the wire and arc additive manufacturing process is presented based on the F.E. method. An important quality of the F.E. model that is presented in this research is to describe the temperature field that is experienced by the deposited material in the wire and arc additive manufacturing process. In contrast to the traditional method of monitoring the substrate temperature, the F.E. model allows to describe the temperature field that is experienced by the deposited material constituting both the multilayer weld deposit and the component. Accordingly, the F.E. model is capable to describe the effect of the locally attained temperature field on the microstructure of the deposited material constituting the multilayer weld deposit in terms of the thermal characteristics including the temperature distribution, the locally attained temperature values, the cooling rates and the temperature gradients throughout the component. Two cooling methods are proposed to control the heat dissipation from the component to the environment based on the application of an interlayer waiting time and immersing the component into a cooling medium. The results show a significant effect of the cooling methods on the temperature field that is experienced by the material constituting both the multilayer weld deposit and the component. Indicating that the cooling methods that are proposed in this research are effective to control the microstructure and the temperature field that is experienced by the component in the wire and arc additive manufacturing process. The resulting microstructure is characterised in terms of the microstructural morphology and the microstructural constituents, using optical microscopy based on the average grain size and the distribution of alloying elements throughout the material constituting the multilayer weld deposit. In addition, the average grain size and the distribution of the alloying elements throughout the material are evaluated in terms of the hardness values.Materials Science and Engineerin
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Nuclear dependence of parton distributions
No full textThe author reviews the emerging information on the way quark, antiquark, and gluon distributions are modified in nuclei relative to free nucleons. He placed particular emphasis on Drell-Yan and phi production on nuclei and caution against premature use of these as signals for quagma in heavy-ion collisions
A study of breakwater gap wave diffraction using close range photogrammetry and finite and infinite elements.
No full textIn this thesis the diffraction of water waves passing through a gap in a breakwater is investigated experimentally, using close range photogrammetry, and numerically, using finite and infinite elements. The author was particularly interested in validating specific breakwater gap diffraction diagrams given in popular coastal engineering design manuals. Breakwater gap configurations with the following gap width to wave length ratios (B/L ratios) were analysed, both experimentally and numerically, namely: B/L = 1,64; 1,41; 1,2; 1; 0,75; 0,5. These configurations are symmetrical, i.e. both breakwater arms lie on the same straight line. An asymmetrical B/L = 1,64 breakwater gap configuration was also analysed. Previous experimental breakwater gap diffraction investigations are reviewed leading to the conclusion that the reported results are inconclusive due to (1) the relatively poor accuracy with which the wave heights were measured and (2) secondary basin effects which were superimposed upon and thus distorted the pure diffraction phenomena. In the experimental breakwater gap configurations investigated by the author, splitter plates were used to eliminate the reflection problems on the seaward side of the breakwaters, whilst a novel photogrammetric wave height measurement technique was used to measure accurately the wave heights in the entire basin, before they could be distorted by reflecting waves, basin resonance effects, etc. This "infinite basin technique" was used to simulate experimentally and measure the diffraction of a continuous wave train entering an infinite basin via a gap in an approximate totally absorbing breakwater. A number of different photogrammetric wave height measurement techniques based on analogue procedures, the theory of projective transformations, and the theory of the deformed reference plane, are investigated and developed. It was found that the technique based on the projective transformation theory, and in which the plates are analysed using a stereo-comparator linked to a microcomputer, is the most accurate. Using this technique it was found that, with the cameras situated approximately 5 m above the water surface, the wave heights in the basin can be measured with an accuracy of better than 2 mm. The above method, in conjunction with the infinite basin technique, was used to analyse the experimental breakwater gap configurations. The basic linear wave theory is described leading to the derivation of the Helmholtz diffraction equation. The classical diffraction theories for the semi-infinite breakwater and breakwater gap configurations are reviewed and compared. The Better-off refraction - diffraction equation is then briefly derived. A review of previous numerical refraction - diffraction investigations, and also of modern numerical methods for water wave diffraction and refraction-diffraction, is given. This review led to the adoption of the finite and infinite element program "WAVE", developed at the University College of Swansea, to model numerically the experimental breakwater gap configurations. The use of the "WAVE" program to model breakwater gap wave diffraction is novel and certain conceptual problems had to be overcome. Finally, the experimental and numerical diffraction diagrams obtained were compared to analytical diagrams where these were available. The correlation between the finite element and analytical results is excellent. When comparing the experimental and finite element results the general conclusions are : 1) in regions outside the shadow zones the linear diffraction theory is conservative except close to small gaps (B/L ≤ 1); and 2) within the shadow zones the linear theory is not conservative and one will have to allow for non-linear effects such as radiating second-order waves generated at the breakwater tips, and increased wave orthogonal spreading near the gap centre line and subsequent orthogonal bunching in the shadow zones caused by wave steepness differences along the crests. Other conclusions drawn are : 1) the photogrammetric techniques described are the best available for the experimental simulation and analysis of infinite domain diffraction and refraction - diffraction problems; and 2) the finite and infinite element program "WAVE" is a very useful tool for the prediction of wave heights in large harbour basins
PRESENCE AS CYBER-IMMERSION AND INFANTILE LIFEWORLD TRANSITION FACTOR F.E. VASILYUK'S TYPOLOGY
No full textАвтор статьи анализирует психологические аспекты "виртуализации" человека и его бытия в контексте типологии жизненных миров Ф.Е. Василюка. Выдвигается гипотеза о сущностной близости пребывания человека в виртуальном пространстве и нахождения в инфантильном жизненном мире. Автор полагает, что ключевую роль в процессах киберпогружения и перехода в инфантильный жизненный мир может играть нахождение в "состоянии присутствия" как субъективного переживания пребывания в иллюзорном мире, альтернативном реальности.The author analyses psychological aspects of "virtualization" in terms of F.E. Vasilyuk's lifeworlds' typology. The author states that being in the cyberspace is similar to existence in the infantile lifeworld and that the "presence" phenomenon may serve as the key mechanism to cyber-immersion and "slipping" into the infantile lifeworld.111-11
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Resonance photo and electoproduction as a probe of QCD
No full textAnalogies have been drawn between QCD where quarks build up hadrons, which in turn build up nuclei, and QED where electrons build up atoms, which in turn build up molecules. There has been a lot of talk about creating a quark theory of the nucleus in QCD by analogy with the way electrons build up molecules in QED. However, this seems to me to be a case of trying to run before you can walk, in that in QED the first step has been achieved, namely understanding atoms in terms of their electronic structure, but understanding molecules in QED is only understood in rather simple cases. In QCD the situation is even worse, in that we haven't even achieved the first step, namely in understanding how hadrons are built from quarks. We all believe that quarks are in the hadrons, and that at high momentum transfer we can apply perturbative QCD(pQCD). But to build the hadrons, we need pQCD and also non-perturbative QCD, which, at present, means building models to simulate the effects of the confinement. Insofar as any successful model of the nucleus will have it looking to a very good approximation as if it is made of nucleons, then I believe that first we have to understand the dynamics of quarks building the individual nucleons. Throughout this talk, I wanted to show how low-energy electron beams may help us deepen that understanding, and hopefully lead us towards the correct dynamical picture of the nucleon. 28 refs., 1 fig., 2 tabs
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Light quark spectroscopy
No full textRecent data, in particular from LASS and GAMS, are beginning to give a rather clear picture of the spectroscopy of mesons composed of u, d, and s flavors. Details of the radial excitations are now appearing. It may become possible to identify gluonic or molecular and multiquark states by their failure of fit into the emerging q/bar q/ spectrum. An ''anti-selection rule'' for gluonic hadrons is presented. 20 refs., 3 figs., 1 tab
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Parton distributions in nuclei: Quagma or quagmire
No full textThe emerging information on the way quark, antiquark, and gluon distributions are modified in nuclei relative to free nucleons is reviewed. Particular emphasis is placed on Drell-Yan and /psi/ production on nuclei and caution against premature use of these as signals for quagma in heavy-ion collisions. If we are to identify the formation of quark-gluon plasma in heavy-ion collisions by changes in the production rates for /psi/ relative to Drell-Yan lepton pairs, then it is important that we first understand the ''intrinsic'' changes in parton distributions in nuclei relative to free nucleons. So, emerging knowledge on how quark, antiquark, and gluon distributions are modified in nuclei relative to free nucleons is reviewed, and the emerging theoretical concensus is briefly summarized
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