Intelligent dual curve-driven tool path optimization and virtual CMM inspection for sculptured surface CNC machining

This paper investigates the profitability of a dual‐curve driven surface finish tool path under the concept of optimizing crucial machining parameters such as toroidal end‐mill diameter, lead angle and tilt angle. Surface machining error as well as tool path time are treated as optimization objectives under a multi‐criteria sense, whilst a central composite design is conducted to obtain experimental outputs for examination and, finally, fit a full quadratic model considered as the fitness function for process optimization by means of a genetic algorithm. A benchmark sculptured surface given as a second‐order parametric equation was tested and simulated using a cutting‐edge manufacturing modeling software and best parameters recommended by the genetic algorithm were implemented for validation. Further assessment involves the virtual inspection to selected profile sections on the part. It was shown that the approach can produce dual‐curve driven tool trajectories capable of eliminating sharp scallop heights, maximizing machining strip widths as well as maintaining smoothness quality and machining efficiency

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This essay addresses how Africanist choreography operates as a practice of cultural citizenship, focussing on the work of Thomas ‘Talawa’ Prestø as a leading figure in shaping the cultural sphere for choreography based on African and diaspora forms in Norway and internationally. Whereas cultural policy discourse tends to value Africanist choreography as a tool for social inclusion, this essay seeks to foreground the philosophical basis of Prestø’s work – with a focus on his piece I:Object (2018) and its enactment of ideas of Africana philosophy, heritage and polycentrism. However, rather than focussing exclusively on performance analysis, the essay also emphasises the political importance of the professional work that choreographers like Prestø undertake aside from choreographing – analysing the ways in which he has created a new discursive context for his own practice and the challenge to Eurocentric norms of reception this work enacts

Tolerance and safety evaluation of N, N-dimethylglycine, a naturally occurring organic compound, as a feed additive in broiler diets

N, N-dimethylglycine (DMG) is a tertiary amino acid that naturally occurs as an intermediate metabolite in choline-to-glycine metabolism. The objective of the present trial was to evaluate tolerance, safety and bioaccumulation of dietary DMG in broilers when supplemented at 1 g and 10 g Na-DMG/kg. A feeding trial was conducted using 480 1-d-old broiler chicks that were randomly allocated to twenty-four pens and fed one of three test diets added with 0, 1 or 10 g Na-DMG/kg during a 39 d growth period. Production performance was recorded to assess tolerance and efficacy of the supplement. At the end of the trial, toxicity was evaluated by means of haematology, plasma biochemistry and histopathology of liver, kidney and heart (n 12), whereas bioaccumulation was assessed on breast meat, liver, blood, kidney and adipose tissue (n 8). Carcass traits were similar between the control and 1 g Na-DMG/kg feed groups (P>0·05), but the feed:gain ratio was significantly improved at 1 g Na-DMG/kg feed compared with the control or the 10-fold dose (P = 0·008). Histological examinations showed no pathological effects and results of haematology and plasma biochemistry revealed similar values between the test groups (P>0·05). Bioaccumulation occurred at the 10-fold dose, but the resulting DMG content in breast meat was comparable with, for instance, wheat bran and much lower than uncooked spinach. In conclusion, DMG at 1 g Na-DMG/kg improved the feed:gain ratio in broilers without DMG being accumulated in consumer parts. Furthermore, dietary supplementation with DMG up to 10 g Na-DMG/kg did not induce toxicity or impaired performance in broilers

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The effect of the sun and its path on thermal comfort and energy consumption in residential buildings in tropical climates constitutes serious concern for designers, building owners and users. Passive design approaches based on the sun and its path have been identified as a means of reducing energy consumption, as well as enhancing thermal comfort in buildings worldwide. Hence, a thorough understanding regarding the sun path is key to achieving this. This is necessary due to energy need, poor energy supply and distribution, energy poverty and over-dependence on electric generators for power supply in Nigeria. These challenges call for a change in the approach to energy related issues, especially in terms of buildings. The aim of this study is to explore the influence of building orientation, glazing and the use of shading devices on residential buildings in Nigeria. This is intended to provide data that will guide designers in the design of energy efficient residential buildings. The paper used EnergyPlus software to analyze a typical semi-detached residential building in Lokoja, Nigeria, using hourly weather data for a period of 10 years. Building performance was studied as well as possible improvement regarding different orientations, glazing types and shading devices. The simulation results showed reductions in energy consumption in response to changes in building orientation, types of glazing and the use of shading devices. The results indicate a 29.45% reduction in solar gains and 1.90% in annual operative temperature using natural ventilation only. This shows a huge potential to reduce energy consumption and improve people’s wellbeing using proper building orientation, glazing and appropriate shading devices on building envelope. The study concludes that for a significant reduction in total energy consumption by residential buildings, design should focus on multiple design options rather than concentrating on one or few building elements. Moreover, the investigation confirms that energy performance modelling can be used by building designers to take advantage of the sun and to evaluate various design options

A predictive model of the export behaviour of small and medium sized firms: an applic.

Based on an extensive theoretical review, the aim of this paper is to carry out a closer examination of the differences between exporters according to their commitment to the international market. Once the main disparities are identified by means of a non-parametric test, a logistic analysis based upon data collected from small and medium sized manufacturing firms is conducted in order to construct a classificatory model.Export behaviour; Manufacturing; Small to medium-sized firms; Logistic regression; Ma

Artistic expressions in landscape architecture : a example study on creativity and art to strengthen public space

Konsten har länge varit viktig inom staden och landskapsarkitekturen. I utvecklingen av stadsrummet prioriteras funktion och evidens över konstnärliga och originella uttryck. Syftet är att diskutera på vilket sätt konst kan bidra till att stärka offentliga rum i staden och vidare belysa olika skapandeprocesser som kan leda till konstnärliga och originella uttryck i staden. Uppsatsen bygger på en litteraturstudie och en exempelstudie som ska skapa underlag för en nyanserad diskussion kring syftet. Uppsatsens litteraturstudie diskuterar tre huvudämnen: hur konst och konstbegreppet definierats genom historien, hur konsten påverkar människan och samhället och om olika teorier och lagar som berör konstens plats i landskapsarkitekturen och i det offentliga rummet. Målet med uppsatsens exempelstudie är att visa på konstnärliga uttryck och originalitet inom arkitekturen och landskapskonsten och sedan diskutera och peka på vad landskapsarkitekter kan lära sig av detta i gestaltandet av offentliga miljöer. Genom att tänja på gränserna inom respektive yrke och viljan att skapa identitetstarka platser visar personerna hur offentliga rum kan stärkas. Det finns mycket landskapsarkitekter kan ta lärdom av från arkitekter och landskapskonstnärer för att gestalta konstnärliga miljöer och skapa originella uttryck.Art has long been important in urban and landscape architecture. In the development of urban space, function and evidence are prioritized over artistic and original expression. The aim is to discuss how art can contribute to strengthening public spaces in the city and furthermore highlight different creative processes that can lead to artistic and original expressions in the city. The essay is based on a literature study and an example study that will create a basis for a nuanced discussion of the purpose. The literature study discusses three main topics: how the concept of art has been defined throughout history, how art affects people and society, and various theories and laws that affect art's place in landscape architecture and public space. The goal of the essay's example study is to show artistic expression and originality in architecture and landscape art and then discuss and point out what landscape architects can learn from this in their design of public environments. By pushing the boundaries of their respective professions and the desire to create places with a strong identity, they show how public spaces can be strengthened. There is much that landscape architects can learn from architects and landscape artists to design artistic environments and create original expressions