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Institution

University of Maribor

EducationMaribor, Slovenia
About: University of Maribor is a education organization based out in Maribor, Slovenia. It is known for research contribution in the topics: Population & KEKB. The organization has 3987 authors who have published 13077 publications receiving 258339 citations. The organization is also known as: Univerza v Mariboru.


Papers
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Journal ArticleDOI
TL;DR: A chemo‐enzymatic treatment was developed to recover the PET building blocks, namely terephthalic acid (TA) and ethylene glycol, and a Fourier‐transformed Raman method was successfully developed to monitor the monomer and oligomer content in solid samples.
Abstract: Summary Due to the rising global environment protection awareness, recycling strategies that comply with the circular economy principles are needed Polyesters are among the most used materials in the textile industry; therefore, achieving a complete poly(ethylene terephthalate) (PET) hydrolysis in an environmentally friendly way is a current challenge In this work, a chemo-enzymatic treatment was developed to recover the PET building blocks, namely terephthalic acid (TA) and ethylene glycol To monitor the monomer and oligomer content in solid samples, a Fourier-transformed Raman method was successfully developed A shift of the free carboxylic groups (1632 cm−1) of TA into the deprotonated state (1604 and 1398 cm−1) was observed and bands at 1728 and 1398 cm−1 were used to assess purity of TA after the chemo-enzymatic PET hydrolysis The chemical treatment, performed under neutral conditions (T = 250 °C, P = 40 bar), led to conversion of PET into 85% TA and small oligomers The latter were hydrolysed in a second step using the Humicola insolens cutinase (HiC) yielding 97% pure TA, therefore comparable with the commercial synthesis-grade TA (98%)

70 citations

Journal ArticleDOI
TL;DR: It is confirmed that BPA and its structural analogs form hydroxylated metabolites and electrophilic species during bioactivation in HLM and CYP isozymes, which provided important mechanistic insight into the metabolic fate of BPAStructural analogs in vitro.

70 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used a batch stirred tank reactor in dense carbon dioxide for the esterification of oleic acid with oleyl alcohol catalyzed by lipase from Rhizomucor miehei (Lipozyme IM ) was used as a model system.
Abstract: Dense gases were used as a biochemical reaction medium. Esterification of oleic acid with oleyl alcohol, catalyzed by lipase from Rhizomucor miehei (Lipozyme IM ) was used as a model system. Due to the limitation of the process that may arise from the non-polarity of carbon dioxide, which preferentially dissolves hydrophobic compounds, studies were also performed with other gases (n-butane, n-propane, n-propane/n-butane mixture). The study of the pressure stability of the immobilized lipase showed that the lipase is quite stable; it does not lose its activity when it is exposed to various dense gases at high pressure for a longer time. Esterification rates at high pressure were determined for all systems, and it was found that they were higher than at atmospheric pressure. The studies of thermodynamic properties and mass transfer were performed in a batch stirred tank reactor in dense carbon dioxide for the esterification of oleic acid with oleyl alcohol (catalyzed by lipase). The highest rate and maximum conversion were determined. It was found that in a continuous fixed bed reactor at 150 bar, 40°C and water activity 0.46% w/w, the activity of the enzyme preparation was practically unchanged when CO 2 was used as a solvent. The addition of small amounts of water increases the conversion rate. A higher conversion was also observed at a longer residence time. When n-butane was used as a reaction medium a decrease of conversion was observed.

70 citations

Journal ArticleDOI
TL;DR: The NSTLBO algorithm is applied to solve the multi-objective optimization problems of three machining processes namely, turning, wire-electric-discharge machining and laser cutting process and two micro-machining processes and the Pareto-optimal set of solutions for each optimization problem is obtained.
Abstract: Selection of optimum machining parameters is vital to the machining processes in order to ensure the quality of the product, reduce the machining cost, increasing the productivity and conserve resources for sustainability. Hence, in this work a posteriori multi-objective optimization algorithm named as Non-dominated Sorting Teaching–Learning-Based Optimization (NSTLBO) is applied to solve the multi-objective optimization problems of three machining processes namely, turning, wire-electric-discharge machining and laser cutting process and two micro-machining processes namely, focused ion beam micro-milling and micro wire-electric-discharge machining. The NSTLBO algorithm is incorporated with non-dominated sorting approach and crowding distance computation mechanism to maintain a diverse set of solutions in order to provide a Pareto-optimal set of solutions in a single simulation run. The results of the NSTLBO algorithm are compared with the results obtained using GA, NSGA-II, PSO, iterative search method and MOTLBO and are found to be competitive. The Pareto-optimal set of solutions for each optimization problem is obtained and reported. These Pareto-optimal set of solutions will help the decision maker in volatile scenarios and are useful for real production systems.

70 citations

Journal ArticleDOI
TL;DR: A unified impulsive controller is designed by means of the established LMIs by constructing an appropriate Lyapunov function and employing impulsive control theory and the average impulsive interval method to ensure that every subnetwork has multiple equilibrium states.
Abstract: This paper investigates the dynamical multisynchronization and static multisynchronization problem for delayed coupled multistable neural networks with fixed and switching topologies. To begin with, a class of activation functions as well as several sufficient conditions are introduced to ensure that every subnetwork has multiple equilibrium states. By constructing an appropriate Lyapunov function and by employing impulsive control theory and the average impulsive interval method, several sufficient conditions for multisynchronization in terms of linear matrix inequalities (LMIs) are obtained. Moreover, a unified impulsive controller is designed by means of the established LMIs. Finally, a numerical example is presented to demonstrate the effectiveness of the presented impulsive control strategy.

70 citations


Authors

Showing all 4077 results

NameH-indexPapersCitations
Ignacio E. Grossmann11277646185
Mirjam Cvetič8945627867
T. Sumiyoshi8885562277
M. Bračko8773830195
Xin-She Yang8544461136
Matjaž Perc8440022115
Baowen Li8347723080
S. Nishida8267827709
P. Križan7874926408
S. Korpar7861523802
Attila Szolnoki7623120423
H. Kawai7647722713
John Shawe-Taylor7250352369
Matjaz Perc5714812886
Mitja Lainscak5528722004
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202352
2022135
2021809
2020870
2019832
2018756