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Contemporary Management, Circular Economy and Sustainable Development as Paradigm of the Future
No full textIn today's business world, contemporary management, circular
economy and sustainable development are gaining more and more importance
and becoming the paradigm of the future. This research will show how these
concepts interact and how they can contribute together to the creation of a
more sustainable global economic system. Contemporary management focuses
on efficiency, innovation and responsibility to interest groups, which achieves
long-term competitiveness and profitability of organizations. In the context of
the circular economy, the emphasis is on minimizing waste and efficient use of
resources, which directly supports the goals of sustainable development.
Sustainable development, on the other hand, strives for a balance between
economic, social and environmental aspects in order to meet the needs of
today's generations, without jeopardizing the opportunities of future
generations. The combination of these paradigms can create positive synergistic
results. For example, implementing a circular economy requires innovative
approaches in supply chain management, which reduces costs and negative
environmental effects. At the same time, contemporary management can
support sustainability by integrating social responsibility into business
strategies and practices. In the future, these paradigms will open more and
more new business opportunities. Companies that successfully integrate the
circular economy into their operations can create a competitive advantage in a
market that increasingly values sustainability. At the same time, management
that relies on the principles of sustainable development can attract investors
and customers who are increasingly responsible and aware of social and
environmental problems. It is concluded that contemporary management,
circular economy and sustainable development represent integrative approaches that can transform the way of business and live. Their implementation requires changes in organizational culture, technology and regulatory framework. Promising results in the form of better environmental
protection, social justice and economic stability make them indispensable for
the future of global business
Application of Model-Free and Model-Based Kinetic Methods in Evaluation of Reactions Complexity during Thermo-Oxidative Degradation Process: Case Study of [4-(Hydroxymethyl)phenoxymethyl] Polystyrene Resin
No full textThis work examined the possibilities and limitations of model-free and model-based methods related to decrypting the kinetic complexity of multi-step thermo-oxidative degradation processes (as a testing system, a [4-(hydroxymethyl)phenoxymethyl] polystyrene resin was used), monitored by thermal analysis (TGA-DTG-DTA) techniques. It was found that isoconversional methods could successfully determine the correct number of process stages and presence of multiple reactions based on derived Ea(α) profiles and identify the negative dependence of the rate constant on the temperature. These methods could not overcome the problem that arose due to mass transfer limitations. The model-based method overcame more successfully the problem associated with mass transfer because its calculation machinery had capabilities for the correct solution of the total mass balance equation. However, a perfect fit with the experimental data was not achieved due to the dependence on the thermal history of the contribution (ctb.) of a given reaction step inside a fitting procedure cycle. On the other hand, through this approach, it was possible to estimate the rate-controlling steps of the process regarding the influence of the heating rate. It was found that for consecutive reaction mechanisms, the production of benzaldehyde and gases in high yields was controlled by the heating rate, where low heating rates were strongly recommended (≤10 K/min). Also, it was shown that the transport phenomenon may be also the rate-determining step (within the set of “intrinsic” kinetic parameters). It was also established that external heat transfer controls the overall rate, where the “pure” kinetic control regime had not been reached but was approached when lowering the temperature and size of the resin particles
Maintenance and optimization of biogas production: Ensuring material quality
No full textEffective biogas production hinges on the efficient removal of contaminants like plastics, glass, metals, and oversized particles from the organic substrate. The presence of these impurities not only affects the quality of the final digestate or compost but can also lead to operational inefficiencies and increased maintenance costs. Implementing advanced separation technologies—whether before, during, or after the digestion process—is critical for maintaining consistent biogas yields and preventing damage to digestion equipment. The quality of input materials becomes especially crucial when the end product is intended for agricultural or horticultural applications, where even trace contaminants can impact soil health and crop productivity. By optimizing the preparation of raw
materials and incorporating both dry and wet impurity removal systems, biogas facilities can improve operational stability and reduce downtime. Furthermore, such optimizations facilitate more sustainable waste management by ensuring a stable, high-quality biogas output and a digestate rich in nutrients and free from harmful contaminants
Environmental and Social Assessment of SHPP Tearce Bistrica 3 – Expertise
No full textM103 - The expertise is done for Deloitte Consulting co. The investor was EIB (European Investment Bank)
Layer thickness influence on impact properties of FDM printed PLA material
Get PDFPolylactic Acid (PLA) is a widely used material in Fused Deposition Modeling (FDM) technology. Additive Manufacturing (AM) parameters are known to have an influence on the mechanical properties of final components. In FDM, the layer thickness is an influencing parameter providing overall better mechanical properties with lower layer thickness values. In that case, the air gaps created between layers and raster lines have a lower share in total volume. However, layer over-compression might be an issue when choosing the lowest layer thickness options. This research paper investigates the impact properties of PLA material with variations in layer thickness namely, 0.1, 0.2, and 0.3 mm are considered here. Charpy tests were used for the impact property assessment, and all specimens were prepared with 100% infill percentage and honeycomb infill structure. Worth mentioning is that specimens have AMed notches. The impact tests were carried out on 7 specimens per batch (a total of 21 specimens). Therefore, obtained impact results from an instrumented pendulum were observed between groups to have an insight into the beneficial influence of lower layer thickness on impact properties and lower result scatter that finer layer resolution should produce
New Trends in Engineering Research: Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023
No full text
Influence of geometry parameters on shaft's load-carrying capacity
No full textThe load-carrying capacity of shafts is a critical factor in the design and performance of various technical systems, ranging from industrial machinery to all kinds of transmissions. This paper presents a comprehensive study aimed at understanding and quantifying the influence of key factors, including material durability, shaft diameter, surface roughness, stress concentration and the distance between shaft supports, on the load-carrying capacity of the shaft. The load-carrying capacity criterion is the fatigue safety factor. The paper offers a systematic exploration of the influential factors affecting shaft load-carrying capacity, both individually and in combination. The paper concludes by considering the simultaneous influence of all the aforementioned factors. A composite factor is introduced, representing the cumulative effect of material and geometry parameters. This composite factor allows for a holistic approach to shaft design, enabling engineers to make informed decisions that maximize load-carrying capacity while minimizing material usage and manufacturing costs
