453 research outputs found
A preliminary analysis of the impact of autonomous maritime surface ships in marine technology education
No full textThis thesis is written to analyse the development of Maritime Autonomous Surface Ship its impact on technology and trends in shipping. The concept of Maritime Autonomous Surface Ship is introduced and projects that explore the concept and one which has been developed is reviewed. A review of Maritime Autonomous Surface Ships in Maritime Education and Training for seafarers is conducted to see the results of these studies.
The author analyses the courses taught at Aalto University to see how much of the Autonomous Ship concept is incorporated in the education of Naval Architecture students. A study of various courses offered at other universities is conducted and the technologies that are implemented in Maritime Autonomous Surface Ships are analysed. An evaluation of various education techniques is conducted to possibly formulate a plan to incorporate these techniques in the education of students of Marine and Arctic Technology at Aalto University.
Following the research, the viability of Maritime Autonomous Surface Ships to be incorporated is discussed and implementation of techniques in education are shown. A plan is formulated to see which technologies can be incorporated in which courses and a timeline is formulated to incorporate Maritime Autonomous Surface Ships in Marine and Artic Technology at Aalto University.
The author concludes that it is viable to incorporate Maritime Autonomous Surface Ships in education of Naval Architecture students by following the plan given
Product Liability for Online Food Suppliers
No full textThe author has written a series of articles about the legal position of online food suppliers. This article is dedicated to the product liability of online food suppliers. The digitisation of the food chains requires, in the view of Van der Veer, a new and close examination of old product liability questions. The Internet could very well effect a shift in liability upwards or downwards in the food chain. In fact, the author concludes that all liability arrows are aimed at the online food retailer
Design and Experimental Testing of All Glass Sandwich Panels: An Experimental and Numerical Study for the Glass Floors of the Acropolis Museum
No full textThis paper describes the engineering steps taken in order to investigate the potential of glass sandwich elements, made of 2 glass skins separated by a glass core in the form of spacers, as a way to create planar elements with a high stiffness to weight ratio, reducing material consumption in structural glazing applications. The aim is to explore and evaluate the optical quality and the structural performance of those elements. In this research, 7 core topologies are explored in order to define which parameters influence the behaviour of a sandwich structure made completely with glass. From those topologies, one is chosen to be explored further. The said topology is optimised to make the panels more efficient in terms of stiffness and weight reduction. In order to determine the structural behaviour (strength, stiffness, failure modes) of the elements, 4-point bending tests are conducted on 9 specimens in total. Finally, in order to define the aesthetical and structural requirements of such a project, the replacement of the glass floors of the Acropolis Museum in Athens in Greece is used as a case study. The knowledge acquired through this process is used to optimise the panels of the new glass floors taking also into account other parameters related to transparent flooring e.g. optical quality, psychological factors, anti-slip resistance etcStructural Design & Mechanic
Dematerialization of the Ruins: Glass as a Promising Restorative Material for the Consolidation of Historic Structures
No full textThis research investigates the potential of glass as a new design tool to highlight and safeguard our historic structures. Current restoration and conservation treatments with traditional materials bear the risk of conjecture between the original and new elements, whereas the high consolidation demands often result in visually invasive and irreversible solutions. Nowadays, aspects of materiality and aesthetics appear as integral parts of the restoration practices, indicating new materials and technologies in the form of ambiguous gestures rather than absolute and permanent manifestations that prevail over the historic structures. The inherent transparent properties render glass a distinct material that enables the simultaneous perception of the monument in both its original and ruinous state. The emerging technologies have set the ground for using glass in a structural way minimizing the need for substructure and maximizing transparency, while protecting the sensitive historic materials. The paper explores the feasibility of this concept addressing aspects of compatibility, reversibility and transparency, through a review of realized examples. Finally, a developed methodology relates the, available in the market today, glass products to the possible consolidation treatments in respect to the degree of intervention and representativeness, stressing the potential of using and considering glass as a promising restorative material.Applied MechanicsStructural Design & MechanicsOLD Structural Desig
Structural Strength of Laminated Glass
No full textThe subject area "structural strength of materials" is defined generally as а complex of strength characteristics of materials and structural elements, obtained under special mechanical tests. It is shown that these tests should take into account not only the physical and mechanical properties of the material, but technology, blank processing, sphere of application, the influence of shape and sizes of elements as well as of their specific loading and operating conditions. Methods for evaluating the structural strength of glass as a linearly elastic material with high sensitivity to technological defects and operational damage are discussed in the paper. Some results of the study of the strength of elements of architectural and bulletproof laminated glass are given. The sizes of technological defects such as cracks in large-sized building elements are determined on the basis of the results of tests of sheet glass plates on bending. The bending strength of sheet float glass with a thickness up to 10 mm reinforced with modification of the glass surface using various industrial technologies is considered. Some methods and results of experimental study the features of the change in the strength and rigidity of laminated armored glass under multiple ballistic tests are also presented.Structural Design & Mechanic
Innovative Glass Recipes Containing Industrial Waste Materials
No full textThe growth of the industrial production generates a high volume of waste materials. These products have a significant impact on the environment. Therefore, the valorization of industrial wastes, especially those produced in huge quantities, is an important social and ecological issue. Waste reuse and recycling could help to develop new products and aggregate value to materials that would have been previously discarded. Furthermore, it could reduce the consumption of natural resources and pollution. Blast furnace slag and fly ash are waste materials largely used in concrete production, mainly as an aggregate, and road construction, as porous asphalt and in other contexts. These wastes contain many elements that are also present in typical glass formulas, such as CaO, SiO2, Al2O3, and Fe2O3. However, these elements are highly refractory, and their presence in complex compositions leads to a high tendency to crystallize and to high working temperatures. For this reason, it is a challenge to get transparent materials at reasonable temperatures from these waste products. Glass is a material that allows large amounts of various elements in solution, and is suitable for assimilating the complex materials in its compositions. In this work, we produced transparent glass samples incorporating amounts up to 35% (in weight) of blast furnace slag or fly ash. The compositions were adjusted in order to allow for chemically durable glasses in relatively low melting temperature: the samples were successfully submitted to water durability tests and were obtained in melting temperatures between 1100°C and 1350°C, depending on the composition. The melting conditions were optimized in order to achieve a higher transparency. The optical, mechanical and thermal properties of the samples were measured and compared to the standard borosilicate and soda-lime glasses.Applied MechanicsStructural Design & MechanicsMaterials and EnvironmentOLD Structural Desig
Prediction of Strength for Inhomogeneous: Defective Glass Elements Based on the Sequential Partitioning of the Data and Weibull Statistical Distribution
No full textAn analytical approach based on the on the sequential partitioning of the data and Weibull Statistical Distribution for inhomogeneous - defective materials is proposed. It allows assessing the guaranteed strength of glass structures for the low probability of fracture with a higher degree of reliability. Parameters of equations for the piecewise linear approximation for Weibull statistical distribution have been defined on the example of processing of bending tests results for float glass. The advisability of using this approach to structural elements of different size is proved. It was shown that excluding the minimum values from the sample does not lead to the uni-modal distribution. A group of values, forming the lower branch of the distribution, appears again. Statistical analysis of the distribution curves made it possible to identify groups of defects, the technological removal of which would ensure an increase in the guaranteed level of strength. The results are the basis for solving optimization problems when you need to get a guaranteed level of strength for a given probability of fracture with minimal costs for glass element manufacture and treatment.Structural Design & Mechanic
Cast Glass Components out of Recycled Glass: Potential and Limitations of Upgrading Waste to Load-bearing Structures
No full textAlthough in theory glass can be endlessly remelted without loss in quality, in practice only a small percentage gets recycled, mainly by the packaging industry. Most of the discarded glass fails to pass the high quality standards of the prevailing glass industry -due to coatings, adhesives, other contaminants or incompatibility of the recipe- and ends up in the landfill. However, employing discarded glass in cast components for building applications can be a way to reintroduce this waste to the supply chain. Such components can tolerate a higher percentage of inclusions, without necessarily compromising their mechanical or aesthetical properties. This paper explores the potential but also the limitations of recycling glass in order to obtain load-bearing components. First, an overview is provided regarding which types of glass reach the recycling plants and the which not, arguing on the reasons behind this selection. Afterwards, a series of experiments is presented, exploring the possibilities of recycling everyday glass waste, from beer bottles and Pyrex® trays to mobile phone screens. Each type of glass waste is initially cast separately to define its flow capability and risk of crystallization. The above information is linked to the X-ray fluorescence (XRF) analyses of the samples prior to recycling. Then, the possibility to mix different glass recipes without fracturing is evaluated. The results point out the types of glass with potential in structural applications, and the overall feasibility of the concept.Applied MechanicsStructural Design & MechanicsOLD Structural Desig
A Re-evaluation of the Physiochemistry of Glass on the Basis of Recent Developments and its Relevance to the Glass Industry
No full textThe classical image of glass is that of a rigid, transparent brittle material characterized by a non-crystalline microstructure. This 19th and 20th century image however is mostly based on the contrast between soda lime glass and metals. It does not really make sense in the 21th century where more modern testing methods have increased our understanding of the physiochemistry of glass. Based on recent results and the development of computational molecular dynamic software modelling a new approach to the physiochemistry of glass is outlined. The consequences this view has on glass properties and processing are explained.Structural Design & Mechanic
BIO-BIBLIOMETRIC PROFILE OF DR. MADHUKAR GARAD
No full textThis paper presents bio-bibliometric profile of Dr.
Madhukar Garad through his contributions as author,
committee member, resource person, PhD Guide, etc.
in the field of Library and Information Science. The
data for this study was collected through his resume
as well as google search. The analysis includes journal
preferences for his publication, papers presented by
him in various conferences and seminars; collaboration
for publications; analysis of publications by document
types, etc. It was found that he has contributed to LIS
field not only through authoring papers for journals
and conferences but also by teaching and guiding LIS
professionals at undergraduate, post-graduate and
doctoral levels
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