Visualization analysis of high voltage pulsed electric field based on Web of Science database

Effect of high-voltage pulsed electric field (HPEF) pretreatment on biogas production rates of hybrid Pennisetum by anaerobic fermentation

High voltage pulsed electric fields (PEF) can be used to inactivate microorganisms in liquids. Applying this PEF technology to food pasteurization is a promising nonthermal method, which may radically change food preservation processes and provide consumers with microbiologically safe, minimally processed, fresh-like products. A continuous-flow system in laboratory-size prototype was constructed for the nonthermal pasteurization of liquid foods with PEF technology. Major components in the prototype include a high voltage repetitive pulse generator, a coaxial liquid food treatment chamber, a fiber optic temperature sensing instrument, and a data acquisition system. Microbial inactivation tests were conducted in the continuous PEF treatment system. Repetitive high voltage pulses with an exponential decaying waveshape were applied to the liquid food which was pumped through the treatment chamber. Test microorganisms selected for inactivation were: Escherichia coli; Staphylococcus aureus; and Saccharomyces cerevisiae. Over six order-of-magnitude reductions in the viability of selected microorganisms were achieved when the food temperature was maintained below 40/spl deg/C.

Industrial uses of an enzyme in the fields of medicine and foods are increasing. Lactase is one of those enzymes. Since the lactase derived from yeast exists in the cell body, it is obtained from inside of the cell by destroying the cell membrane by ultrasonic disintegration conventionally. Recently, the new collection method of enzyme from the inside of cells using the high voltage pulse electric field (PEF) has been studied. Also this study focuses on extracting the lactase from pores forming on the cell membrane effectively by applying PEF to Kluyveromyces lactis. As a result, intracellular lactase has been able to be extracted to the culture medium by applying PEF to K. lactis.

Electrocoalescence is widely used to dehydrate crude oil, but impurities in crude oil are extremely complex, which greatly weaken the effect of dehydration. To understand the coupling law of various impurities, a static demulsification experiment was conducted under a high frequency and high voltage pulsed electric field to investigate the effects of electric field parameters (voltage, frequency, pulse width ratio), emulsification strength, electrocoalescence time, water content, acid value, injection alkali ratio, calcium content, decalcification agent concentration and removal process on desalination, decalcification, and deacidification. The results showed that the desalination and decalcification rates varied synchronously with the electric field parameters and water content. Additionally, the desalination and decalcification rates decreased with the emulsification strength, alkali injection ratio, acid value, and calcium content. Further, they increased first and then decreased with decalcifier concentration. The deacidification rate did not vary with the electric field parameters, but it strengthened with the water content and alkali injection ratio. Conversely, it decreased with the acid value, calcium content, and decalcifier concentration. Additionally, it increased first and then decreased with the emulsification intensity. The best removal procedure is deacidification followed by decalcification. These findings are helpful to achieve the combined removal of various impurities in crude oil.

Characterization of the effects of high voltage pulsed electric field treatment on milk fat globule membrane proteins and phospholipid based on 31P NMR and 4D-DIA quantitative proteomics.

Transparent triboelectric nanogenerator-induced high voltage pulsed electric field for a self-powered handheld printer

In this study, we evaluated Electrical Impedance Spectroscopy (EIS) as a monitoring tool of the physiological state of Bryopsis, Cystoseira, Stypopodium, Cladophora, Taonia, Padina, Ulva and Sargassum tissues. We analyzed the electrical response differences in the EIS between species and in the same seaweed tissue before and after electroporation. Electroporation using high voltage pulsed electric field (PEF) treatment was used as a model for cell disruption affecting the tissue physiology without being noticeable to the naked-eye. Significant differences in all the seaweeds were observed before and after electroporation. We found that seaweed species with smaller and rounder cells have a clearer dispersion profile (around a frequency of 10–100 kHz) compared to the dispersion profile of seaweed with larger cells with unround form. Those results suggest that EIS could be used as a fast non-invasive monitoring technique of the changes in the physiology of seaweeds.

Electroporation-based therapies (EBTs) employ high voltage pulsed electric fields (PEFs) to permeabilize tumor tissue; this results in changes in electrical properties detectable using electrical impedance spectroscopy (EIS). Currently, commercial potentiostats for EIS are limited by impedance spectrum acquisition time ( ∼10s); this timeframe is much larger than pulse periods used with EBTs ( ∼1s). In this study, we utilize rapid EIS techniques to develop a methodology for characterizing electroporation (EP) and thermal effects associated with high-frequency irreversible EP (H-FIRE) in real-time by monitoring inter-burst impedance changes. A charge-balanced, bipolar rectangular chirp signal is proposed for rapid EIS. Validation of rapid EIS measurements against a commercial potentiostat was conducted in potato tissue using flat-plate electrodes and thereafter for the measurement of impedance changes throughout IRE treatment. Flat-plate electrodes were then utilized to uniformly heat potato tissue; throughout high-voltage H-FIRE treatment, low-voltage inter-burst impedance measurements were used to continually monitor impedance change and to identify a frequency at which thermal effects are delineated from EP effects. Inter-burst impedance measurements (1.8 kHz - 4.93 MHz) were accomplished at 216 discrete frequencies. Impedance measurements at frequencies above ∼1MHz served to delineate thermal and EP effects in measured impedance. We demonstrate rapid-capture ( 1s) EIS which enables monitoring of inter-burst impedance in real-time. For the first time, we show impedance analysis at high frequencies can delineate thermal effects from EP effects in measured impedance. The proposed waveform demonstrates the potential to perform inter-burst EIS using PEFs compatible with existing pulse generator topologies.

This study aimed to evaluate the effects of high-voltage pulsed electric fields (HPEF) and transglutaminase (TGase) cross-clinking on the physicochemical and rheological properties of Pleurotus eryngii protein (PEP). The results showed that HPEF increased α-helixes and β-turns but decreased β-folds. A HPEF at 1500 V/cm maximized the free sulfhydryl content and solubility of PEP. TGase formed high-molecular-weight polymers in PEP. TGase at 0.25% maximized the free sulfhydryl groups, particle size, and solubility; shifted the maximum absorption wavelength from 343 nm to 339 nm and 341 nm; increased α-helixes and β-turns and decreased β-folds; and showed better rheological properties. Compared with TGase cross-linking, HPEF-1500 V/cm and 1% TGase significantly reduced the free sulfhydryl groups, particle size, and solubility, produced more uniform network structures, and improved the rheological properties. These results suggest that HPEF can increase the cross-linking of TGase and improve rheological properties of TGase-cross-linked PEP by affecting the physicochemical properties.

Effects of high-frequency and high-voltage pulsed electric field parameters on water chain formation

With the sustained economic growth, the importance of family finance has become increasingly prominent. In this research, the papers collected by Chinese National Knowledge Infrastructure (CNKI) and Web of Science (WOS) were visually analyzed via CiteSpace software, and a knowledge map for the field of family finance was constructed, which displayed the current situation, hotspots, and trends of family finance research from multiple angles in an all-round way. The results show that the number of published Chinese and English papers is increasing year by year, among which English papers are mainly contributed by American scholars, with relatively little cooperation and exchange between countries. In Chinese literature, the cooperation between authors and institutions is also limited. At present, the research in the field of family finance is ushering in a stage of rapid development, and the research hotspots mainly focus on financial literacy, financial knowledge, risk finance, and inclusive finance. Given this, the future research should focus on the cooperation among authors, institutions, and disciplines, and meanwhile, increase in-depth research on digital finance, and digital divide. These efforts will promote the further development of research in the field of family finance in China.

This study was conducted to perform a bibliometric analysis of research in the field of green accounting. In this context, publications indexed in the Web of Science (WoS) database were examined. As of March 30, 2024, a search was conducted in the WoS database using the keyword “green accounting”, with all WoS Core Collection criteria selected. The search results revealed no studies related to green accounting prior to 1992, while 250 studies were identified between 1992 and 2024. The highest number of publications was recorded in 2013. Among the analyzed studies, economics was found to be the most prominent research field, encompassing 118 publications. In terms of country-based contributions, the United States led the field with 61 studies. The World Bank was identified as the institution contributing the most to green accounting research. Additionally, Nicholas Z. Muller and Robert Mendelsohn were determined to be the most highly cited authors in the field. Furthermore, the study conducted co-authorship, institutional collaboration, and country collaboration network analyses, along with keyword mapping, bibliographic coupling of texts, and co-citation analysis of authors. Based on these analyses, visual mappings were created, and the discussion and conclusions were presented.

The Holy Quran, hadiths, and fiqh texts are among the primary and secondary sources that are being used to alter the Islamic economic and financial system in accordance with contemporary economic changes. The aim of this study is to evaluate the qualitative output in the field from a bibliometric perspective by examining the academic studies that cover the concept of 'hadith' and are indexed in the economics and finance categories of the Web of Science (WOS) database. As part of the study, a comprehensive literature review, known as a bibliometric mapping analysis, was conducted. The study conducted a bibliometric analysis of all studies that include the term hadith in the WOS database between 1982/01-2023/07 and the studies that fall into the WOS categories (economics, business, business finance). In addition, a content analysis of the articles containing the term hadith in the Web of Science (WOS) database was carried out. As part of the study, the data were categorized using VOSviewer (1.6.18). As a result of the study, it was found that there are a majority of studies that make conceptual evaluations in the field of Hadith and these studies are concentrated on the theological basis. It was found that there are very few studies in the economic and financial category of the Hadith concept and that there is a gap in this area. Therefore, the results of this study will shed light on future studies.

This paper deals with the multi-perspective bibliometric analysis of Central European scientific journals indexed in the Web of Science database and covered in the Journal Citation Reports – Social Science Citation Index (SSCI). The analysis focuses on the evaluation of the (inter) national orientation of Central European Social Science journals indexed in the period 2012 – 2015. Data were obtained from the Web of Science database on October 20, 2016. The journals are divided in two groups in favour of the scientific discipline identifying the journal in the Web of Science. The first group consists of journals belonged to public health and psychology. The second group includes all social related scientific journals covered in both the SSCI and Science Citation Index Expanded (SCIE) databases. Journals were chosen by language versions of journals in the Web of Science, language versions of articles, authors’ most important institutional affiliations; and other statistically significant indicators provided by Clarivate Analytics. Assessment of the “openness of Central European journals” to foreign authors was analyzed on the basis of the “INO indicator” (Index of National Orientation). Statistical analyses were conducted on the articles which carry the relevant scientific information. Descriptive statistics was used for the data analysis, using frequencies, percentages and means. The results of this research showed a strong orientation towards Slovakian and Czech authors regardless of the two analyzed groups.  Based on INO, most of the Central European journals quality and impact were comparatively low.  A competitive environment has been created for journals in the social science disciplines, especially for those with competitors in neighboring countries in fields such as psychology, economics, geography and sociology. &nbsp

Strange attractors in the Web of Science database