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Found 6423 publications

Exopolysaccharides from lactic acid bacteria: Techno-functional application in the food industry

E. Korcz László Varga

Publication Name: Trends in Food Science and Technology

Publication Date: 2021-04-01

Volume: 110

Issue: Unknown

Page Range: 375-384

Description:

Background: The growing consumer demand for foods that do not contain artificial additives and are “clean labeled” can be addressed in fermented products by using lactic acid bacteria (LAB) capable of synthesizing exopolysaccharides (EPS). There is great variability in LAB-based EPS in terms of quantity, monomer composition, molecular weight, charge, and structure, which results in an array of physicochemical and rheological properties that can be exploited for varied applications in the food industry. Scope and approach: EPS are an alternative class of bio-thickeners widely used in the food industry. This review provides a brief overview of EPS composition and production, and highlights EPS functionality, focusing on specific areas and ways of applying them in food products. Key findings and conclusions: Although EPS-producing LAB strains have been traditionally applied in the manufacture of cultured milks, their use in the production process of low-fat cheeses, different plant-based yogurt alternatives, diverse types of sourdough breads, and reduced-fat fermented meat products are some of the novel applications of these polymers. EPS interact with other food components to improve the rheological and sensory properties of foods and, thus, they can act both as texturizers and stabilizers, increasing the viscosity and mouthfeel of products. Despite the abundance of research findings, a better understanding of the structure–function relationship of EPS in food products still remains a challenge.

Open Access: Yes

DOI: 10.1016/j.tifs.2021.02.014

Considering energy in the simulation of manufacturing systems

Sigrid Wenzel János Jósvai Johannes Stoldt Tobias Uhlig Andreas Schlegel Tim Peter

Publication Name: Proceedings Winter Simulation Conference

Publication Date: 2018-07-02

Volume: 2018-December

Issue: Unknown

Page Range: 3275-3286

Description:

In recent years, environmental aspects became one of the key interests in manufacturing. Accordingly, simulation studies had to include factors like energy or emissions. This paper aims to provide a comprehensive introduction to the state of the art in modeling of energy and emissions in simulation of manufacturing systems. We review existing literature to develop a landscape of common approaches and best practices. Typical goals and objectives of the reviewed simulation projects are summarized. Furthermore, we will evaluate the structure and life cycle phases of the examined manufacturing systems and look into the requirements and implementation of respective simulation studies. Finally, we will discuss open questions and future trends in this field of research.

Open Access: Yes

DOI: 10.1109/WSC.2018.8632238

Classifying the Complexity of Competency in Elementary School based on Supervised Learners

Tri Arief Sardjono I. Ketut Eddy Purnama Umi Laili Yuhana Eko Mulyanto Yuniarno Mauridhi Hery Purnomo Laszlo T. Koczy

Publication Name: 2018 International Conference on Computer Engineering Network and Intelligent Multimedia Cenim 2018 Proceeding

Publication Date: 2018-07-02

Volume: Unknown

Issue: Unknown

Page Range: 280-284

Description:

Complexity of competency (CoC) expresses the difficulty level of a competency. The CoC is one of the important parameters for determining the minimum passing level of competency in an assessment system. In Indonesia, the value of CoC is defined by experts based on conditions of subject, students and teachers in each school. The definition process is determined subjectively, where different experts may evaluate CoC in different ways. This is a problem of data classification that requires an automated tool that copes with the amount of data and produces uniform results. To apply an intelligent classifier is essential to solve the issue. This study aims to find the best method for classifying the complexity of competency in Elementary School. Four supervised learning techniques, namely, Naïve Bayes, Multilayer Perceptron, Sequential Minimal Optimization, and RIPPER, were implemented to analyze the dataset. Based on an experiment with 203 data, we found that the Multilayer Perceptron achieved the best performance in the sense of Mean Absolute Error, Root Mean Squared Error, and Receiver Operating Characteristic value. At the same time SMO is better than all other methods in precision, recall, and F-Measure.

Open Access: Yes

DOI: 10.1109/CENIM.2018.8710883

Effects of selective laser melting building directions and surface modifications on surface roughness of Ti6Al4V alloy

Tünde Anna Kovács Hassanen Jaber J. Kónya Hajnalka Hargitai

Publication Name: Discover Applied Sciences

Publication Date: 2024-01-01

Volume: 6

Issue: 1

Page Range: Unknown

Description:

Abstract: In this paper, the effect of building direction relative to the substrate (0°, 45°, and 90°) on the surface roughness of Ti6Al4V samples produced by selective laser melting (SLM) has been investigated. After SLM, the samples were subjected to different surface modifications, including acid etching (E) with HF, sandblasting (S) with Al2O3 and sandblasting + etching (SE). Surface roughness of the prepared samples were investigated by Alicona Infinite Focus optical microscopy and Scanning Electron Microscopy (SEM). It was found that there is an inverse relationship between surface roughness and building directions. Additionally, the results showed that the acid etching process increases the surface roughness of the samples at 45° and 90°, while the surface roughness decreases at 0°. Furthermore, the results showed that sandblasting and sandblasting followed with acid etching (SE) effectively reduced the surface roughness of the samples at all building directions. In summary, the acid-etched Ti6Al4V surfaces manufactured at 90° showed a superior surface roughness (Ra = 4.25 ± 0.21, Rz = 29.63 ± 2.34 μm) among the specimens, which is encouraged osseointegration of implants.

Open Access: Yes

DOI: 10.1007/s42452-024-05656-0

Comparison of Discrete Memetic Evolutionary Metaheuristics for TSP

Péter Földesi Boldizsár Tüu-Szabó Gergő Fogarasi Laszlo T. Koczy

Publication Name: Studies in Computational Intelligence

Publication Date: 2022-01-01

Volume: 955

Issue: Unknown

Page Range: 29-37

Description:

In our paper we compare discrete memetic evolutionary metaheuristics (and other algorithms) which are applicable (also) for the widely studied and industrially applied (symmetric, Euclidean) NP-hard combinatorial optimization problem called Traveling Salesman Problem (TSP) such as DBMEA (Discrete Bacterial Memetic Evolutionary Algorithm), DMTLBO (Discrete Memetic Teaching–Learning Based Optimization) not to mention DMSSA (Discrete Memetic Squirrel Search Algorithm) algorithms. The comparisons occurred under the same fixed conditions.

Open Access: Yes

DOI: 10.1007/978-3-030-88817-6_4

Rattling detection of electric components

Zoltán Gazdagh J. A. Erdelyi A. Bartus B. Fukker

Publication Name: Proceedings of ISMA 2024 International Conference on Noise and Vibration Engineering and Usd 2024 International Conference on Uncertainty in Structural Dynamics

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 2799-2813

Description:

The study emphasizes the importance of detecting and addressing the issue of nonlinear phenomena in electronic components, due to their potential implications for structural integrity, damage or malfunction to sensitive electronic elements, and a reduction in overall vehicle reliability. This investigation based on time-domain experimental data facilitates rattling detection that aims to distinguish rattling from other type of nonlinearities. The sample is screwed on a fixture, which is mounted on an electrodynamic shaker that serves as the excitation source. The excitation signal is a closed loop sinusoidal sweep, measured in both directions and at different amplitudes. The paper will focus on several methods for identifying nonlinear phenomena, such as the Poincare map or Hilbert transformation. Phase plots are produced, that serve as a valuable tool for studying anomalies, which can be correlated to the extremes of Lyapunov exponents. The above methods are evaluated on their ability to separate rattling form other phenomena to identify genuine instances of rattling.

Open Access: Yes

DOI: DOI not available

Lateral-torsional buckling behaviour of I-beams with sinusoidally corrugated web

G. Hajdú Imre Cserpes Hartmut Pasternak

Publication Name: Bauingenieur

Publication Date: 2024-01-01

Volume: 99

Issue: 3

Page Range: 69-77

Description:

AB ST R AC T This paper presents a new approach to calculate the elastic lateral-torsional buckling moment of I-beams with sinusoidally corrugated webs. The appropriate hand calculation methods to determine the elastic critical moment of corrugated web beams have so far been based on the modification of the warping constant of the cross-section. Instead of modifying the warping constant, the corrugated web is modelled as a thin, equivalent orthotropic plate with uniform thickness. With the usage of the elastic critical moment the inelastic lateral-torsional buckling resistance of sinusoidally corrugated I-beam is determined according to the current Eurocode 1993–1–1:2005.

Open Access: Yes

DOI: 10.37544/0005-6650-2024-03-29

State Socialist Experiments—Historical Lessons

Péter Szigeti

Publication Name: Marx Engels and Marxisms

Publication Date: 2023-01-01

Volume: Part F833

Issue: Unknown

Page Range: 275-317

Description:

My present essay attempts to explain and theorize the legacy of state socialism. Apparently, I have chosen a topic that is no longer relevant since these experiments have ceased to exist in the countries of Central-Eastern- and Southern Europe, as well as in the ex-Soviet Union.

Open Access: Yes

DOI: 10.1007/978-3-031-22504-8_11

Biomolecule composition and draft genome of a novel, high-lipid producing Scenedesmaceae microalga

Péter Bálint Gergely Maróti Prateek Shetty Eszter Badics Norbert Incze V. Soós Vince Ördög E. Balázs

Publication Name: Algal Research

Publication Date: 2021-04-01

Volume: 54

Issue: Unknown

Page Range: Unknown

Description:

Lipid biosynthesis in microalgae can be stimulated by cultivation in low nitrogen medium. MACC-401 was isolated from the soil surface in Tres Marias (MG-Brazil). The strain shows the morphological characteristics of the Scenedesmaceae green algae. The daily biomass and lipid production of MACC-401 is remarkable, 0.36 g L−1 and 110 mg L−1, respectively. Exploration of the genetic background of this promising strain not only allows the utilization of this species for industrial-scale lipid production, but also provides genetic targets to select lipid-producing strains from microalgae collections. We conducted physiological experiments by cultivating MACC-401 in complete and N-limited media and performed genome sequencing as well as transcriptome analysis. The estimated nuclear genome size of MACC-401 is 99.503 Mbp and the chloroplast genome is 0.15 Mbp. The phylogenetic analysis confirmed that the MACC-401 belongs to the Scenedesmaceae family, and represents a genetically distinct accession in this family. A basic comparative transcriptome analysis resulted in the identification of N-starvation responsive genes, which could serve as markers to monitor the onset of lipid accumulation in algal cultures.

Open Access: Yes

DOI: 10.1016/j.algal.2020.102181