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Found 6289 publications

Maximizing the Capacity Utilization of Selective Waste Collection Vehicles

István Lakatos Ádám Titrik

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2022-01-01

Volume: 19

Issue: 7

Page Range: 165-176

Description:

Selective Waste Collection is an essential part of recycling raw materials, in order to protect our environment. The waste collection is carried out by using a seriously polluting vehicle, due to the fact that most of the gathering vehicles are using fossil energy sources, like gasoline. High volume of carcinogenic elements are contained in the emitted exhaust gases. The current waste collection methods are just focusing on the load of the selective waste collective vehicle during a collection route. The goal of this research is to find the best solution to use the full storage capacity of the selective waste collecting vehicle with the lowest volume of residual air due to the effectively compressed waste. The closed and uncompressed PET bottles require the largest volume in the waste collecting vehicle. It is essential to minimize the air in the PET bottles to decrease the volume. Different methods have been examined to increase the density of the selectively collected waste. Statistical data have been used to determine the collecting parameters – nowadays, a 15 t waste collecting vehicle, with a 20 m3 load capacity is only gathering 1-1.5 t PET due to the ineffective use of its load compartment. The application of the method herein, enhances the efficiency of the waste collecting vehicle by gathering 4-10 times more waste than currently used methods.

Open Access: Yes

DOI: 10.12700/APH.19.7.2022.7.9

Effects of Wheel Surface Defects on Ground Borne Vibration

Szabolcs Fischer Farshad Astaraki Majid Movahedi Rad Milad Kazemian Milad Akbarivarmaziar Ahmad Mohammadi Doost

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2022-01-01

Volume: 19

Issue: 6

Page Range: 129-141

Description:

Wheel ground borne vibrations, may have a significant impact on human activity and on nearby buildings. In metropolitan cities, metro lines and their development may cause such vibrations. Despite many works and solutions for path and receiver, the excitation source could also have a great effect. Wheel and rail damages are the two sources of vibration which can increase the damage impact by a factor of 5x. Wheel damage would increase dynamic vertical force noticeably and an increase in ground-borne vibration is expected. In this study with the help of finite element modelling, wheel damage including wheel flat, spalling and wheel oval is studied for a slab track and results are discussed. The studied parameters are velocity and wheel damage and their effect on ground-borne vibrations are examined.

Open Access: Yes

DOI: DOI not available

Does Mineral Resources Utilization and Governance Policy Induce Income Inequality: Contextual Findings from Historical Data of China

Laszlo Vasa Chen Wang Xiaoyi Ren

Publication Name: Politicka Ekonomie

Publication Date: 2025-01-01

Volume: 73

Issue: 5

Page Range: 891-925

Description:

In the current literature strand, most of the literature is devoted to the role played by mineral and governance policies in environmental quality. However, their criticality in income inequality is mainly overlooked by scholarly works. This research investigated the nexus of mineral and governance policies with income inequality while exploring the importance of per capita income, health expenditure, and poverty. Covering the extended period from 1984Q1 to 20223Q4 in the case of China, this research confirms the presence of long-run equilibrium association between variables. Due to the non-normal data distribution, this research uses quantile regression and a series of robust non-parametric and parametric approaches. The research concludes that mineral resources, health expenditure, governance efficiency, regulatory quality, and poverty headcounts significantly reduce income inequality. Wealth from mineral and health expenditures substantially improves the living standards of the general public. The governance policies are also beneficial in equal wealth distribution of the country. On the contrary, per capita income and government stability are the region’s leading factors of income inequality. Based on the predicted results, this research recommends improved minerals management, strengthening of governance institutions and policies, and enhancement in health expenditure to tackle the issue of income inequality.

Open Access: Yes

DOI: 10.18267/j.polek.1463

Examination of welded joint of titanium alloy used in oral surgery

K. Kulcsár J. Kónya H. Hargitai

Publication Name: Iop Conference Series Materials Science and Engineering

Publication Date: 2020-08-25

Volume: 903

Issue: 1

Page Range: Unknown

Description:

The additive manufacturing of customized Ti-6Al-4V (Grade 23) implants, which in the present research concerns the dental and maxillofacial surgical field, may require complex manufacturing technology due to their complexity and assembly. In practice, additively manufactured titanium implant elements are supplemented by threaded sleeves that allow disassembly. These turned elements made from Grade 5 material quality rolled preform are joined by laser micro-welding with Grade 1 material. This special process for implant production is still not widespread in current manufacturing practice, and there is no technical recommendation for the manufacturing parameters of these implants. The aim of our research is to explore the possibilities and limitations of additive process in the manufacture of custom-made implants and to provide guidelines for optimal manufacturing and welding parameters. In the initial phase of the research, preliminary experiments were conducted with the conventional and additive manufacturing of cylindrical test specimens and with the production of combined products by micro-welding. The specimens were subjected to tensile testing, the weld was examined by CT, and the fracture surfaces were studied by optical microscope and scanning electron microscope.

Open Access: Yes

DOI: 10.1088/1757-899X/903/1/012016

Urbanization, Industrialization, and Energy Transition: An Empirical Analysis of Life Expectancy in a Developing Economy

Pasquale Marcello Falcone Md Hasanur Rahman Fariha Akter Lucky Syeda Sajia Afroz Rumpa

Publication Name: Sustainable Development

Publication Date: 2026-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Urbanization is a defining feature of contemporary development, shaping economic opportunities, social structures, and health outcomes. This study examines the influence of urbanization on life expectancy in Bangladesh, with particular attention to the role of the energy mix and industrialization. Using annual data from 1971 to 2024 and applying the Autoregressive Distributed Lag (ARDL) model based on results of the unit root test, where some variables are stationary at level I(0) and some are at first difference I(1), the analysis explores both short- and long-run dynamics. The results indicate that a 1% increase in urbanization raises life expectancy by 0.09% in the short run. Moreover, non-renewable energy consumption and industrialization are found to exert a positive impact on life expectancy due to extensive contribution to national development, where industrialization depends on energy consumption and industrialization leads the economic development in Bangladesh. On the other hand, renewable energy has failed to raise life expectancy due to lack of renewable energy access in Bangladesh. In addition, in the long run, urbanization has a positive impact, where a 1% increase of urbanization leads to raise life expectancy 0.10%. By linking urbanization, energy use, and industrial development, this research addresses a gap in the literature regarding their combined effect on human longevity in developing contexts. The study's findings have suggested policy implications for developing countries to improve urban residents' life expectancy by considering the aim of sustainable development goals (SDGs) 3, 7, and 11.

Open Access: Yes

DOI: 10.1002/sd.70825

ENERGY ANALYSIS OF BUILDINGS WITH LARGE GLAZED SURFACES

T. Horváth Zsolt Szűrös Rita Rebeka Ördög

Publication Name: Iet Conference Proceedings

Publication Date: 2024-01-01

Volume: 2024

Issue: 8

Page Range: 58-64

Description:

Modern architecture has brought new opportunities with the development of industry and technology. Among other things, it has become possible to visually connect the interior and exterior spaces with transparent structures, while providing climatic separation. Since the first modern buildings of Frank Lloyd Wright and Mies van der Rohe, large glazed surface buildings have gained considerable ground. Through the examination of a case study, the research looks for the answer to which of the possible structural solutions for buildings with large surfaces of glass are double or triple glazing, the use of internal or external, or fixed or movable shading is it more beneficial from a building energy point of view, in order to create the comfort of the interior space. The tests were carried out according to the calculations of the 7/2006 TNM decree and also according to the rules of the 9/2023 ÉKM decree, in force from November 2023.

Open Access: Yes

DOI: 10.1049/icp.2024.2682

Examining the Environmental Ramifications of Asbestos Fiber Movement Through the Water–Soil Continuum: A Review

András Torma Gergely Zoltán Macher Dóra Beke

Publication Name: International Journal of Environmental Research and Public Health

Publication Date: 2025-04-01

Volume: 22

Issue: 4

Page Range: Unknown

Description:

The environmental pollution potential of asbestos products is a worldwide health issue, but their dissemination through the water–soil continuum is often an overlooked aspect. Similarly, the behavior of asbestos fibers released from the products is still not fully understood, although our knowledge is based on studies concerning their mineralogical characteristics, health effects, and waste disposal. It has been claimed and contradicted that asbestos harm is only found in air and humans. Asbestos fibers are found not only in industrial settings but also through the industrial use of asbestos cement products, which has contributed to asbestos emissions and its movement in water and soil. Asbestos fibers are diverse in their physicochemical properties, and this diversity has a significant influence on their behavior in the environment. Recent research has confirmed that asbestos can be transported by water and spread to other parts of the environment. However, the mechanisms underlying this, such as the settling of fibers, their attachment to soil particles, or their movement in groundwater, as well as the environmental and health implications, require further investigation. This paper examines the process and impact of asbestos contamination in the interconnected water, soil, and plant environmental sectors, providing a systematic review of the latest literature.

Open Access: Yes

DOI: 10.3390/ijerph22040505

Testing output variables for sensitivity study of nonlinear vibration systems

F. Hajdu G. Y. Molnarka

Publication Name: Pollack Periodica

Publication Date: 2020-08-01

Volume: 15

Issue: 2

Page Range: 70-81

Description:

In this study the detailed One-at-a-Time sensitivity analysis of nonlinear massspring- damper systems is carried out with numerical simulation. The degree of sensitivity was measured with a sensitivity index and based on its sensitivity Fuzzy-sets were established. The sensitivity of a parameter then can be expressed by the membership to the Fuzzy-sets. In this study the root mean square of acceleration, the maximum amplitude of acceleration and the peak frequency were chosen as output variables to measure sensitivity. With this research it was proven, that the root mean square of acceleration and the peak frequency can be used for sensitivity study of nonlinear vibration systems effectively.

Open Access: Yes

DOI: 10.1556/606.2020.15.2.7

First report of Macrocheles robustulus (Berlese, 1904) (Acari: Mesostigmata: Macrochelidae) on the pet beetle, Pachnoda marginata peregrina Kolbe (Coleoptera: Melolontidae: Cetoniinae)

Jenő Kontschán Sándor Hornok

Publication Name: Acarologia

Publication Date: 2025-01-01

Volume: 65

Issue: 3

Page Range: 717-720

Description:

The first occurrence of the widely distributed predatory mite Macrocheles robustulus (Berlese, 1904) on the cetoniin beetle pet species, Pachnoda marginata peregrina Kolbe is presented. A short description and new illustration are provided with a note on macrochelid mites associated with cetoniin beetles.

Open Access: Yes

DOI: 10.24349/e4n8-l8ik