A design optimization of a staggered pin fin heat sink made of a thermally conductive polymer is presented. The influence of several design parameters like the pin fin height, the diameter, or the number of pins on thermal efficiency of the natural convection heat sink is studied. A limited number of representative heat sink designs were selected by application of the design of experiments (DOE) methodology and their thermal efficiency was evaluated by application of the antecedently validated and verified numerical model. The obtained results were utilized for the development of a response surface and a typical polynomial model was replaced with a neural network approximation. The particle swarm optimization (PSO) algorithm was applied for the neural network training providing very accurate characterization of the heat sink type under consideration. The quasi-complete search of defined solution domain was then performed and the different heat sink designs were compared by means of thermal performance metrics, i.e., array, space claim and mass based heat transfer coefficients. The computational fluid dynamics (CFD) calculations were repeated for the most effective heat sink designs.
Conical picks are cutting tools used in many branches, in particular in the mining, road construction and building branch. Contact with the excavated face causes their constant wear, which is an unfavorable but unavoidable process. Milling heads of working machines are equipped with several dozen conical picks, and mining in abrasive or hardly accessible rocks can reduce their life to a few hours. It is in the interest of both users and producers to increase their durability, as tools replacement, apart from purchase and logistic costs, results in machine downtimes. In the article various solutions of conical picks, their construction, dimensions and materials used have been discussed. Technical procedures applied to increase the durability of conical picks and their regeneration as well as methods of extending the life of picks working in difficult conditions have been presented. Two author’s methods of extending the life of picks working in difficult conditions, covered by a patent application, have also been presented. The first solution involves ensuring an uninterrupted rotational movement of the pick in the holder. Patent claims include an innovative method of equipping the additional sleeve integrated with the holder with a rotational bearing, which enables a continuous rotation of the pick. The tool equipped with a bearing generates much lower movement resistance than the standard mounting. The holder is designed to mount classic commercial picks. What is important, the pick replacement does not require interfering with the bearing assembly. The second solution concerns the manner of protecting the working part of the pick by means of a special element made of an abrasion resisting material. This element is the pick tip, the geometry of which varies from the commonly applied posts made of sintered carbide. In this solution, the tip has a shape corresponding to the form of conical pick’s wear, which causes that its steel body does not wear. Moreover, there is a possibility of applying a mobile, rotational mounting of the tip to the body.
2017 claims that corporate reporting on non-financial information has been currently gaining much more interest compared to the past. Most food enterprises believe that performing responsibly and showing an interest in society and the environment will result in some profit and will benefit them as well as society. Thus, the study focused on managerial reporting of 2017 regarding the social and environmental effects of food companies in Slovakia. The research covered all of the food enterprises operating in Slovakia that compiled annual reports for 2017. In total, 142
the management domain of a product lifecycle and on the relationships with stakeholders in the market. The digital solutions of Industry 4.0 change humans as consumers and affect their work processes and behaviour. Moreover, considering the extremely dynamic and even exponential development of technology and its impact on society, one can claim that changes also occur in the areas of marketing activities and marketing tools aiming to adapt them to the new reality of today’s markets ( Daviy et al., 2017 ; Sterev, 2017 ; Mazurek, 2019 ; Mazurek and Nosalska, 2018
; Michelino et al., 2014 ; Schroll and Mild, 2011 ). The publications by Chesbrough (2003) and Chesbrough and Crowther (2006) indicate that openness to innovation is mainly characteristic for large enterprises from high-tech sectors. This view was also shared by Bianchi (2011) , who claimed that large enterprises implemented this concept on average 1.5 times more frequently than SMEs. Furthermore, Sandulli (2012) pointed out that larger enterprises were often more willing to collaborate with others in the scope of innovation compared to smaller businesses. However
The article presents the main aspects which require attention when optimizing and improving the manufacturing process, i.e.: the human resources aspect, the technical aspect and the organizational aspect. Concepts such as the Total Quality Management, Six Sigma or Lean Manufacturing claim that work improvement should be a continuous process. The foundation for implementing the improvement of processes, regardless of the concept, are well-organized and orderly workplaces as well as standardization, which can be achieved thanks to the Japanese 5S method.
The task of the mixed pure CAD generating method developed by the authors consists in finding only the points situated on the gear tooth surface. The use of the mixed CAD gear generating method results in a very large and particular type of Points Cloud: This contains points situated both in the tooth space, and on the tooth surface. The existing filtering programs and methods, as it was presented in previous papers, cannot deal with these particular point sets. The development of the named particular generating method claims an algorithm and a computer software which can find the envelope of the Points Cloud. This papers presents an Alpha Shape algorithm based filtering algorithm, adapted and developed to be used together with the mixed CAD generating software.
Many innovative environmental technologies never reach the market because they are new and cannot demonstrate a successful track record of previous applications. This fact is a serious obstacle on their way to the market. Lack of credible data on the performance of a technology causes mistrust of investors in innovations, especially from public sector, who seek effective solutions however without compromising the technical and financial risks associated with their implementation. Environmental technology verification (ETV) offers a credible, robust and transparent process that results in a third party confirmation of the claims made by the providers about the performance of the novel environmental technologies. Verifications of performance are supported by high quality, independent test data. In that way ETV as a tool helps establish vendor credibility and buyer confidence. Several countries across the world have implemented ETV in the form of national or regional programmes. ETV in the European Union was implemented as a voluntary scheme if a form of a pilot programme. The European Commission launched the Environmental Technology Pilot Programme of the European Union (EU ETV) in 2011. The paper describes the European model of ETV set up and put to operation under the Pilot Programme of Environmental Technologies Verification of the European Union. The goal, objectives, technological scope, involved entities are presented. An attempt has been made to summarise the results of the EU ETV scheme performance available for the period of 2012 when the programme has become fully operational until the first half of 2016. The study was aimed at analysing the overall organisation and efficiency of the EU ETV Pilot Programme. The study was based on the analysis of the documents the operation of the EU ETV system. For this purpose, a relevant statistical analysis of the data on the performance of the EU ETV system provided by the European Commission was carried out.
) for assessing exposure to risk factors for work-related musculoskeletal disorders. Applied ergonomics, 39(1), 57-69.
Dunning, K. K., Davis, K. G., Cook, C., Kotowski, S. E., Hamrick, C., Jewell, G. and Lockey, J. (2010). Costs by industry and diagnosis among musculoskeletal claims in a state workers compensation system: 1999-2004. American journal of industrial medicine, 53(3), pp. 276-284.
Górny, A. (2014). Human factor and ergonomics in essential requirements for the operation of technical equipment. In: Stephanidis C., ed