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Found 6374 publications

Impact of the microalgae-bacteria interaction on maize (Zea mays L.) health and yield

Zoltán Molnár Tibor Janda Wogene Kabato

Publication Name: Bio Web of Conferences

Publication Date: 2024-08-23

Volume: 125

Issue: Unknown

Page Range: Unknown

Description:

Microbial biofertilizers, which include microorganisms that improve soil nutrients and make them easier to cultivate, are eco-friendly alternatives to chemical fertilisers, encouraging plant growth and supporting sustainable agriculture. The purpose of the study was to evaluate the health of crops measured by the normalized difference vegetation index (NDVI) and yield, influenced by the combination of biomass from specific cyanobacteria (MACC-612, Nostoc linckia) and plant growth promoter bacteria (PGPB). Using a factorial design in a complete randomized block configuration, four replications were performed. The experimental design included the testing of three concentrations of microalgae (untreated, 0.3 g/L N. linckia, and 1 g/L N. linckia) and two PGPBs (untreated, Azospirillum lipoferum, and Pseudomonas fluorescens). Experiments in the field were conducted for three consecutive years (2021, 2022, and 2023). The results show that the combined application of N. linckia and PGPB to soil treatment has significantly improved plant health and yield characteristics. The combined use of 0.3 g/L N. linckia and A. lipoferum has improved the health of plants (NDVI), seed count per cob, thousand-seed weight, and total yields, achieving a significant increase of yield by 1.4 fold for 2021, 1.37 fold for 2022, and 1.39 fold for 2023. These results demonstrate that applying low concentrations of N. linckia (0.3 g/L) along with A. lipoferum provide a cost-effective solution without compromising the benefits. Consequently, the integration of cyanobacteria and PGPB represents a promising approach to improve crop growth and yield while minimizing environmental impacts.

Open Access: Yes

DOI: 10.1051/bioconf/202412503004

Resources curse and sustainable development perspective: Fresh evidence from oil rich countries

Laszlo Vasa Wadim Strielkowski Yanwu Yang Zhun Zheng Alexander Lisovskiy

Publication Name: Resources Policy

Publication Date: 2023-08-01

Volume: 85

Issue: Unknown

Page Range: Unknown

Description:

In recent years, many regions that are rich in natural resources have fallen behind other countries that have fewer natural resources in terms of economic growth. This study examines the role of resource rents on national income of Arab world over the period of 1989–2021. We use mineral and oil rents to capture the resource rents. In order to determine the long-term effects of resource rents on the national income of the Arab world, this study employs the econometric methods of DOLS and FMOLS. In addition to that, the FMOLS approach, which is an asymptotically unbiased and effective estimator, is utilized throughout this study. These approaches can help to address some of the issues that arise in the analysis of time series data, is used in this study to control for endogeneity as well as serial correlation. We find that oil rents are harmful for economic growth, which approves the resource curse phenomena in case of Arab world. The abundance of natural resources in the Arab world could persuade its officials to spend more money on consumption and less on investments in physical capital, which would be detrimental to economic progress. Moreover, reliance on natural resources can lead to a scenario known as the Dutch Disease.

Open Access: Yes

DOI: 10.1016/j.resourpol.2023.103698

Towards the modelling of the fault tolerance mechanism of the PIM-SM multicast routing protocol in an IPTV environment

István Derka Gábor Lencse

Publication Name: Esm 2012 2012 European Simulation and Modelling Conference Modelling and Simulation 2012

Publication Date: 2012-01-01

Volume: Unknown

Issue: Unknown

Page Range: 152-156

Description:

The fault tolerance mechanism of the PIM-SM IP multicast routing protocol is investigated in order to be able to model it. The analysis is done by playing different fault scenarios on a mesh topology multicast test network built up by XORP routers in a virtualized environment. Different parameters of the PIM-SM and the OSPF protocols are examined if they influence and how they influence the outage time of an IPTV service. The results of the experiments provide important factors for building a formal model of the service outage time of an IPTV service. © 2012 EUROSIS-ETI.

Open Access: Yes

DOI: DOI not available

Student Burnout in Higher Education: From Lockdowns to Classrooms

Márta Konczos Szombathelyi Kevin M. Jackson

Publication Name: Education Sciences

Publication Date: 2022-12-01

Volume: 12

Issue: 12

Page Range: Unknown

Description:

During the spring 2021 semester, COVID-19 forced most universities around the world to teach exclusively online in a very short time frame. This situation reversed itself, however, during the fall 2021 semester when COVID-19 restrictions were lifted as teachers and students returned to classrooms. This study includes ninety-seven international students who participated in surveys at the beginning and the end of the fall 2021 semester, which included questions related to burnout, self-efficacy, resiliency, home environments, and technical issues. Students were asked to reflect on their educational experiences during the spring 2021 and fall 2021 semesters. The purpose of this study is to identify and examine the most significant changes that occurred between these two semesters. The results indicate a significant shift in student burnout as challenges with home environments were replaced with ones related to returning to the classroom. Even as the concerns about COVID-19 lessen, higher education institutions must understand the magnitude and permanence of its impact.

Open Access: Yes

DOI: 10.3390/educsci12120842

Blockchain and supply chain sustainability

Abderahman Rejeb Karim Rejeb

Publication Name: Logforum

Publication Date: 2020-01-01

Volume: 16

Issue: 3

Page Range: 363-372

Description:

Background: Supply chain sustainability is a central concern of most organizations. The main objective of sustainable supply chains is to create and maintain long term economic, social, and environmental value for all stakeholders involved in delivering products and services to markets. As sustainability constitutes one of the critical drivers of innovation, the recent emergence of blockchain technology typifies the disruptive impact of digital innovation on supply chain sustainability. Blockchain is a foundational technology that poses a shift in the development of supply chain sustainability. Methods: Despite the increasing importance of blockchain in improving supply chain efficiencies and bringing societal changes, research investigating its potentialities from the lens of sustainability is scarce. Therefore, the primary goal of this paper is to fill this knowledge gap and synthesize the literature from leading journals on the topic of blockchain and its relation to supply chain sustainability. Papers were collected from different scientific databases and carefully analyzed. The possibilities of blockchains are identified and classified according to the triple bottom line framework, namely the economic, social, and environmental dimensions of sustainability. Results and conclusions: The majority of studies focused on the economic implications of blockchains on supply chains. The sustainable economic aspects of the technology identified in the reviewed literature are mostly the transformational potentials of blockchains and their capabilities to drive new disintermediated business models, higher operational efficiencies, cost advantages, and additional sources of value creation. The social empowerment of supply chains is found through the ability of blockchain to create trustful relationships among supply chain partners, increase food safety, support humanitarian logistics, and promote social equity. Moreover, firms attempting to move forward in their environmental policies and strategies can use blockchain to extend their efforts to improve their environmental practices across the supply chain, reduce the strain on energy and natural resources, and offer environmentally friendly products.

Open Access: Yes

DOI: 10.17270/J.LOG.2020.467

Shared Heritage, Divergent Paths: Heritage Tourism Development in UNESCO Fortified Church Villages of Transylvania, Romania

János György NAGY Enikő Nemes Tímea Csizmadia Melinda Nagyné Molnár

Publication Name: Heritage

Publication Date: 2026-03-01

Volume: 9

Issue: 3

Page Range: Unknown

Description:

Romania joined the UNESCO Convention in 1990. The fortified church of Biertan was inscribed on the World Heritage List in 1993, followed by six additional Transylvanian fortified church villages in 1999. An interesting feature of this heritage landscape is that settlements with different demographic and development trajectories share the same World Heritage designation. In our research, we collected demographic and tourism data from these seven municipalities. Subsequently, a standard questionnaire was sent to municipal decision-makers (mayors) in 2023 to map tourism development in their municipalities. The communication activities of the municipalities were analysed using a content analysis method, which was observation-based and based only on online content. In our experience, there is no common strategy to turn this heritage into a tourist attraction; each of the seven municipalities has faced this challenge separately. The main result of the research was to explore how heritage tourism works in municipalities with different demographic, linguistic-cultural heritage and with different levels of management.

Open Access: Yes

DOI: 10.3390/heritage9030116

Fractal based wire antenna impedance simulation by the method of moments

Miklós Kuczmann Zoltán Pólik

Publication Name: Pollack Periodica

Publication Date: 2012-07-01

Volume: 7

Issue: 2

Page Range: 69-81

Description:

Koch curve based dipole antennas have been built up, have been simulated and measured to examine the reachable size reduction.The simulations have been performed by the method of moments (MoM) and the results have been checked by the finite element method (FEM) and by measurements. The Pocklington' integral equation has been implemented in MATLAB environment to simulate the input impedance of dipole antennas. The ATW EFIE method has been implemented and solved by the 4NEC2 software to examine the behavior of arbitrary shaped thin wire antennas. In COMSOL Multiphysics software environment a finite element model has been set up to solve the Helmholtz equation and to simulate the antennas under examination. Koch curve based dipole antennas have been measured in a full anechoic chamber, as well and finally the numerical and the experimental results have been compared.

Open Access: Yes

DOI: 10.1556/Pollack.7.2012.2.6

Historical origin of the fine structure constant: Part IV: Coronatio: Explicandi et applicandi subtilita(ti)s structurae constantis sephano rege

Peter Varlaki Imre J. Rudas

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2012-12-21

Volume: 9

Issue: 5

Page Range: 45-93

Description:

Part IV of our paper on the historical (archetypal) background of the "fine structure constant" deals with the general physical and psychic world views, concealing the dynamic isomorphic meaning systems, related to Saint Stephen (Sephanus Rex) found in works of 1000 years old. Following the comparison of the representations (pre-figurations of the dynamic models) of the demonstrated background languages, we present that the author devoted himself to create a common background language of different religious courses. We intend to show that the background language (considered in general as a mapping of primordial images for "system and control" problems), was centred on his assumed proto-Cabbala, the Book of Bahir and its concealed meaning system, in close relation with the numeric archetype of 137 and the 137-type of "fine structures" within the decimal sephirotic world "controlling system" of the pleroma (the hypothesised "transcendent cyber space").

Open Access: Yes

DOI: DOI not available

Selection from a fuzzy signature database by Mamdani-algorithm

Katalin Tamás Laszlo T. Koczy

Publication Name: Sami 2008 6th International Symposium on Applied Machine Intelligence and Informatics Proceedings

Publication Date: 2008-08-25

Volume: Unknown

Issue: Unknown

Page Range: 63-68

Description:

There are many complex, well structured problems, where a hierarchical structure within the data is present. This means, that one or several components of the structure are determined at a higher level by a sub-tree of other components. The concept of fuzzy signatures was introduced to help model these kinds of problems. The data set belonging to a problem has an arbitrary structure, but due to some missing components, the structures of the data may slightly differ. So that these data can be evaluated, aggregation operators are given for each node in the arbitrary structure for the purpose of modifying the structure. To deduce a conclusion for an observation from a data set having the structure mentioned above, fuzzy signature based rule bases and the generalisation of Mamdani-type inference were introduced. In this paper the formerly introduced idea of Mamdani-type inference in fuzzy signature based rule bases will be used for selecting records from an available data base which maximally match the requirements specified in a pattern. Finally a possible application on a realistic example with missing data components will be shown. © 2008 IEEE.

Open Access: Yes

DOI: 10.1109/SAMI.2008.4469135