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Publications - 6278

Measurement and analysis of industrial forklifts vibration levels for unit load testing purposes

Laszlo Horvath Péter Böröcz Yu Yang Huang

Publication Name: Applied Sciences Switzerland

Publication Date: 2021-04-01

Volume: 11

Issue: 7

Page Range: Unknown

Description:

Forklifts are one of the most common types of material handling equipment used in warehouses and distribution centers. Vibration generated by forklifts may have an effect on the performance of unit loads and product damage rates. Historical research projects have focused predominantly on the measurement of vibration for over-the-road transportation. Thus, there is still a lack of understanding of the level of vibration caused by forklifts. The goal of this study was to understand how the vibration that is experienced by unit loads while being transported by forklifts is affected by factors such as speed, road condition, unit load weight, type of forklift, and sensor location. For this study, power spectral density (PSD) measurements were collected using a Lansmont Saver 9X30 data logger. Vibration levels were measured for three different industrial forklifts on two different surface types. The forklifts were driven at two different speeds while carrying two different unit load weights. For all of these conditions, the vibration levels were measured at the forklift carriage, at the back of the fork tine heel, and at the fork tine tips. The results obtained show that the highest vibrational intensity occurred at 3–4 Hz, while the highest overall Grms value observed was 0.145 G2/Hz (between 1–200 Hz). An increase in the forklift speed caused an increase in vibration intensity. In contrast, an increase in the unit load weight carried by the forklift caused a decrease in vibration intensity. Among the three forklifts studied, the gas-powered forklift had the highest vibration intensity, and all forklifts, when driven on asphalt, experienced more vibration.

Open Access: Yes

DOI: 10.3390/app11072901

Biostimulating effects of the cyanobacterium Nostoc piscinale on winter wheat in field experiments

Zoltán Molnár I. Gergely G. Takács Vince Ördög Wendy A. Stirk Johannes van Staden

Publication Name: South African Journal of Botany

Publication Date: 2019-11-01

Volume: 126

Issue: Unknown

Page Range: 99-106

Description:

Due to global warming, a permanent rainfall deficit and higher temperatures reduce the available water in the soil, which severely influences plant water status. Current research needs to address ways to overcome these problems in order to maintain crop yields. The beneficial effects of seaweed extracts against abiotic and biotic stress factors of plant growth is well known but the use of microalgae for the same purpose is not well described. The aim of the present work was to investigate the plant biostimulating effects of the cyanobacterium Nostoc piscinale on the winter wheat variety “Bőség.” Experiments were carried out over three years in Hungary at the Mosonmagyaróvár Faculty Farm. Freeze-dried cyanobacterium was re-suspended in water (0.3 or 1.0 g/L) and sprayed at 400 L/ha on wheat leaves at tillering or tillering and ear emergence. Root weight, relative water content (RWC), chlorophyll and proline content of leaves were measured during the vegetation period. Ear number, ear length, grain numbers in ear, thousand grain weight and yield were measured at harvest. The most economic and highest yield increase was obtained by 0.3 g/L treatment with N. piscinale at tillering and ear emergence. Beneficial effects included a stronger root system, elevated leaf RWC, higher proline content and increased leaf chlorophyll content, which remained high in plant leaves treated with N. piscinale for one or two weeks longer than in the control leaves. The high chlorophyll content extended the productive vegetation period of the treated plants. Cyanobacterium treatment increased the ear number, ear length, grain number per ear, thousand grain weight and yield of the wheat crop.

Open Access: Yes

DOI: 10.1016/j.sajb.2019.06.033

The effect of background and outlier subtraction on the structural entropy of two-dimensional measured data

Brigita Sziová Levente Solecki Szilvia Nagy

Publication Name: International Journal of Reasoning Based Intelligent Systems

Publication Date: 2020-01-01

Volume: 12

Issue: 3

Page Range: 200-209

Description:

For colonoscopy images the main information is in the fine structure of the surface of the bowel or colorectal polyps, similarly to the case of combustion engine cylinder surface scans, where the grooving and wear can be detected from the fine pattern superposed to a cylinder curvature. In both cases appear outliers, colonoscopy images have many reflections, whereas the roughness scanners detect small dust particles as well as the micron scale vibrations from the environment. The method presented in this paper takes care of both the problems using histogram stretching together with a special type of filtering. Also, masks are introduced in order to control the effect of the operators. The effects of the processing steps on the structural entropy of the image is also studied, as structural entropies are used in characterisation of the images. By removing the background makes the structural entropies much smaller, and by suppressing the outliers the structural entropies increase.

Open Access: Yes

DOI: DOI not available

The impact of a low-cost airline’s flights on local economy – On the example of Cluj-Napoca International Airport (Romania)

Dusek Tamás Lukovics Miklós

Publication Name: Regional Statistics

Publication Date: 2022-01-01

Volume: 12

Issue: 4

Page Range: 132-151

Description:

Aviation is paramount in contemporary medium and long-distance transport, and airports are essential junctions in the modern globalised economy. The presence of airports is determinative concerning local regions or areas, and a specific methodology demonstrates its impact on the economy. It allows estimating the direct, indirect, and consequent multiplicative effect of the presence of airports on employment and income more accurately. Thus, it numerically describes the economic significance of certain airports as well. It is not only about quantifying the significant impact of an airport on the local economy; it should also be the extent to which an airline’s presence impacts regional and local economic processes. Besides analysing general methodological issues concerning the impact analysis of airports, this study aims to evaluate the impact of a particular low-cost airline’s flights on the local economy. The basis of our study is the Cluj Avram Iancu International Airport (CLJ) of Cluj-Napoca, Romania, and its dominant airline Wizz Air, which has a distinct impact because of its distance from large international airports. Thus, we can conclude that as a net result at the regional level, the presence of Wizz Air’s Cluj-Napoca flights generates over 4,000 person employment impact besides about 54 million euro income impact on the local economy

Open Access: Yes

DOI: 10.15196/RS120406

Psychometric Analyses of the Italian 8-Item, 9-Item, and 12-Item Versions of the Depression, Stress and Anxiety Scale

Renato Pisanti Rocco Servidio Paolo Soraci Elena Del Fante Elisa Chini Giulia Marafioti Mark D. Griffiths Attila Szabo

Publication Name: Evaluation and the Health Professions

Publication Date: 2025-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The present study aimed to validate the Italian 8-item, 9-item, and 12-item versions of the Depression, Anxiety and Stress Scale-21 (DASS-21), addressing the need for shorter yet psychometrically robust measures. Two studies were conducted with different samples. In Study 1 (n = 541), confirmatory factor analysis (CFA) and reliability testing of the short-form versions of the DASS were performed, and their convergent validity with life satisfaction and mental well-being was examined. Study 2 (n = 321) extended this validation by reassessing factor structure, reliability, and convergent validity using constructs associated with psychological distress, including positive and negative affect, self-esteem, and perceived stress. Results demonstrated that all short-form versions retained the three-factor structure of the original DASS-21, with overall sufficient fit indices, especially the 9-item model. Reliability metrics confirmed internal consistency (all Cronbach’s alpha and McDonald’s omega ≥0.70). Convergent validity analyses indicated strong correlations between the short-form versions of DASS-21 (min = 0.675, max = 0.956) and associated psychological constructs, aligning with theoretical expectations. The scales captured the relationships between psychological distress, positive and negative affect, perceived stress, mental well-being, self-esteem, and life satisfaction. Findings suggest that the Italian versions of the DASS-8, DASS-9, and DASS-12 provide feasible and reliable alternatives to the DASS-21 for assessing depression, anxiety, and stress, supporting their usefulness in clinical and research contexts, particularly in circumstances in which brevity is essential.

Open Access: Yes

DOI: 10.1177/01632787251380550

Identification and dynamic analysis of crime hot-spots in Hungary by a complex Computer Intelligence approach

Peter Foldesi Boldizsar Tuu-Szabo Gabor Kovacs Gergő Fogarasi László T. Kóczy Szilvia Nagy

Publication Name: Ines 2019 IEEE 23rd International Conference on Intelligent Engineering Systems Proceedings

Publication Date: 2019-04-01

Volume: Unknown

Issue: Unknown

Page Range: 247-252

Description:

In the field of forensic science, crime maps are widely used. The representation of the data and analysis could offer some steps forward for crime prevention. Clustering is able to help identify criminal hot-spots and further analysis designate which require intervention. The aim of this study is to present a first step in the analysis of Hungary-related criminal information.

Open Access: Yes

DOI: 10.1109/INES46365.2019.9109437

Value and value creation from a company approach – theory and practice

Adrienn Reisinger Nárai Márta

Publication Name: Civil Szemle

Publication Date: 2022-01-01

Volume: 19

Issue: 3

Page Range: 5-28

Description:

The topic of the paper is the value and value creation from firms’ perspective with theoretical and empirical approaches. The aim of the study is to give an overview about the value and value creation frameworks related to different scientific fields and its approaches from small and medium sized enterprises’ (SMEs) views. The fact that nowadays companies’ operation is a very complex one which requires a knowledge that covers as much knowledge and factors as possible gives the relevance of the topic. Such a factor could be the understanding the meaning of firm value and firm value creation beyond the financial and economic approaches. This may help companies to be more conscious about their operation and their social and economic impact. The paper gives an overview about the Creating Shard Value (CSV) framework, too which is widespread in the international literature and practice but in Hungary only few study mention it, so its introduction could be useful for the Hungarian academics and practitioners. The paper introduces also some results of an interview research between August 2021 and July 2022. A research is aimed to know the business-society relation among SMEs in Győr, Hungary, the value creation is a part of this research. Forty SMEs were involved in the research. The main result is that the term firm value creation is a diverse concept which could be interpreted from several approaches. Its knowledge could lead to a more conscious leadership of a company.

Open Access: Yes

DOI: DOI not available

Mediumship and its Cognitive 'Survival' in Identification of Collective Individuation : the Hungarian Painter-Genius Csontváry's Mediumship and 'Survival' Part I. on the Wailing Wall Picture of Csontváry

Peter Varlaki Judit Ida Steiner-Varlaki Péter Baranyi

Publication Name: 10th IEEE International Conference on Cognitive Infocommunications Coginfocom 2019 Proceedings

Publication Date: 2019-10-01

Volume: Unknown

Issue: Unknown

Page Range: 553-560

Description:

The paper deals with the mediumship and the retro-cognitive and precognitive patterns in identification of collective individuation. We attend to show the relationships between the artistic visions (pictures) of Csontváry the Hungarian genius and the dreams and active imaginations of C. G. Jung and W. Pauli by the identification of unconscious symbolic processes of collective individuation.11 This paper is dedicated to the blessed memory of Dr. Rezsö Pertorini and Dr. Anthony Storr. Thanks for the inspiration to Dr. Katalin Gellér.

Open Access: Yes

DOI: 10.1109/CogInfoCom47531.2019.9089946

On the classification of 3D periodic polyhedral cellular systems

Eniko Bitay J. Tamás Reti

Publication Name: Materials Science Forum

Publication Date: 2008-01-01

Volume: 589

Issue: Unknown

Page Range: 341-348

Description:

In several fields of materials science space-filling polyhedral systems are generally used for modeling and characterizing the microstructure of polycrystalline and cellular materials. In this paper a simple quantitative method designated to classify 3D triply periodic, space-filling, cellular systems is outlined. The concept of the proposed method is based on the known analogy between the combinatorial structure of 3D space-filling polyhedral systems and of 4D polytopes. For classification purposes various topological shape indices are defined and tested. It is demonstrated that using two appropriately selected shape factors (asymmetry and compactness coefficients) a global combinatorial classification of cellular systems can be performed.

Open Access: Yes

DOI: 10.4028/www.scientific.net/msf.589.341