bluuebunny/crossref_metadata_2025 huggingface dataset:
The Relationship between Mean Platelet Volume and Neutrophil–Lymphocyte Ratio and Liver Fibrosis in Patients with Chronic Hepatitis B
Authors: Ekmen Mehmet Onder , Uzman Metin
Published: July 2023

Objective: The neutrophil–lymphocyte ratio (NLR) can be helpful both in demonstrating acute and chronic liver injury and predicting malignant potential. The mean platelet volume (MPV) is also a marker that can be used as a risk indicator in atherosclerosis-associated diseases, reflecting inflammation. Within the scope of this research, we aimed to elucidate the relationship between the mean platelet volume and neutrophil–lymphocyte ratio in liver fibrosis in chronic hepatitis B patients. Materials and Methods: A total of 84 patients who were followed up with the diagnosis of chronic hepatitis B and who underwent liver biopsy were included in this prospective study. Complete blood count parameters (neutrophil, lymphocyte, neutrophil–lymphocyte ratio, hemoglobin, thrombocyte, MCV, and MPV values), demographic data, biochemistry panel (AST, ALT), HBV DNA, and liver biopsy fibrosis scores obtained from hospital database were analyzed. Since the follow-up period of chronic hepatitis B patients is six months, patients were screened in order to include a full 3-year screening pool. Results: A total of 84 patients were enrolled within the scope of this study. The chronicity index was ‘0’ in 7.1% (n = 6), ‘1’ in 23.8% (n = 20), ‘2′ in 56% (n = 47), and ‘3’ in 13.1% (n = 11)of the patients. According to the chronicity index groups, there was a statistically significant difference between the medians of the hepatitis activity index (HAI) values at the 5% significance level (p < 0.001). The correlation analysis revealed a statistically significant relationship between the chronicity index and the mean platelet volume to lymphocyte ratio (MPVL). However, considering the degree of the relationship, it can be said that it was a positive and weak relationship (p = 0.046, r = 0.218). Conclusions: Regarding the outcomes of this research, a significant relationship was found between the neutrophil–lymphocyte ratio, mean platelet volume, and fibrosis.
Effect of Lu-Doping on Electrical Properties of Strontium Zirconate
Authors: Pavlovich Anastasiya , Pankratov Alexander , Dunyushkina Liliya
Published: July 2023

SrZrO3-based perovskites are promising proton-conducting membranes for use in fuel and electrolysis cells, sensors, hydrogen separators, etc., because they combine good proton conductivity with excellent chemical stability. In the present research, the effect of Lu-doping on microstructure, phase composition, and electrical conductivity of SrZr1−xLuxO3−δ (x = 0–0.10) was investigated via X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy and impedance spectroscopy. Dense ceramic samples were obtained by the solution combustion synthesis and possessed an orthorhombic perovskite-type structure. The solubility limit of Lu was revealed to lie between x = 0.03 and 0.05. The conductivity of SrZr1−xLuxO3−δ increases strongly with the addition of Lu at x < 0.05 and just slightly changes at x > 0.05. The rise of the water vapor partial pressure results in an increase in the conductivity of SrZr1−xLuxO3−δ ceramics, which confirms their hydration ability and significant contribution of protonic defects to the charge transfer. The highest conductivity was achieved at x = 0.10 (10 mS cm–1 at 700 °C, wet air, pH2O = 0.61 kPa). The conductivity behavior was discussed in terms of the defect formation model, taking into account the improvement in ceramic sintering at high lutetium concentrations.
Monitoring of Particulate Fouling Potential of Feed Water with Spectroscopic Measurements
Authors: Weirich Marc , Antonyuk Sergiy
Published: July 2023

The modified fouling index (MFI) is a crucial characteristic for assessing the fouling potential of reverse osmosis (RO) feed water. Although the MFI is widely used, the estimation time required for filtration and data evaluation is still relatively long. In this study, the relationship between the MFI and instantaneous spectroscopic extinction measurements was investigated. Since both measurements show a linear correlation with particle concentration, it was assumed that a change in the MFI can be detected by monitoring the optical density of the feed water. To prove this assumption, a test bench for a simultaneous measurement of the MFI and optical extinction was designed. Silica monospheres with sizes of 120 nm and 400 nm and mixtures of both fractions were added to purified tap water as model foulants. MFI filtration tests were performed with a standard 0.45 µm PES membrane, and a 0.1 µm PP membrane. Extinction measurements were carried out with a newly designed flow cell inside a UV–VIS spectrometer to get online information on the particle properties of the feed water, such as the particle concentration and mean particle size. The measurement results show that the extinction ratio of different light wavelengths, which should remain constant for a particulate system, independent of the number of particles, only persisted at higher particle concentrations. Nevertheless, a good correlation between extinction and MFI for different particle concentrations with restrictions towards the ratio of particle and pore size of the test membrane was found. These findings can be used for new sensory process monitoring systems, if the deficiencies can be overcome.
Additive Manufacturing of Metallic Materials: Structures, Properties and Methodologies
Authors: Wei Qingsong , Han Changjun , Kazantseva Nataliya
Published: July 2023

Additive manufacturing (AM) is a crucial aspect of contemporary science and engineering, enabling the layer-by-layer production of components [...]
Why Above-Average Rainfall Occurred in Northern Northeast Brazil during the 2019 El Niño?
Authors: de Andrade Felipe M. , Godoi Victor A. , Aravéquia José A.
Published: July 2023

El Niño is generally associated with negative rainfall anomalies (below-average rainfall) in northern Northeast Brazil (NNEB). In 2019, however, the opposite rainfall pattern was observed during an El Niño episode. Here, we explore the mechanisms that overwhelmed typical El Niño-related conditions and resulted in positive rainfall anomalies (above-average rainfall) in NNEB. We focus on the austral autumn when El Niño is most prone to rainfall anomalies in the region. The analysis of several datasets, including weather station data, satellite data, reanalysis data, and modelled data derived from a dry linear baroclinic model, allowed us to identify that the austral autumn 2019 above-average rainfall in NNEB was likely associated with four combined factors; these are (1) the weak intensity of the 2019 El Niño; (2) the negative phase of the Atlantic Meridional Mode; (3) local and remote diabatic heating anomalies, especially over the western South Pacific and tropical South Atlantic, which resulted in anticyclonic and cyclonic circulations in the upper and lower troposphere, respectively, over the tropical South Atlantic; and (4) sub-seasonal atmospheric convection anomalies over the western South Pacific, which reinforced the low-frequency convection signal over that region. This latter factor suggests the influence of the Madden–Julian Oscillation on rainfall in NNEB during the first ten days of March 2019. We discuss these mechanisms in detail and provide evidence that, even during an El Niño event, above-average rainfall in NNEB in the austral autumn may occur, and its modulation is not limited to the influence of a single climate phenomenon. Our results may assist in the planning of several crucial activities, such as water resources management and agriculture.
Smartphone-Enabled Fluorescence and Colorimetric Platform for the On-Site Detection of Hg2+ and Cl− Based on the Au/Cu/Ti3C2 Nanosheets
Authors: Chen Keyan , Fu Shiqi , Jin Chenyu , Guo Fan , He Yu , Ren Qi , Wang Xuesheng
Published: July 2023

Smartphone-assisted fluorescence and colorimetric methods for the on-site detection of Hg2+ and Cl− were established based on the oxidase-like activity of the Au–Hg alloy on the surface of Au/Cu/Ti3C2 NSs. The Au nanoparticles (NPs) were constructed via in-situ growth on the surface of Cu/Ti3C2 NSs and characterized by different characterization techniques. After the addition of Hg2+, the formation of Hg–Au alloys could promote the oxidization of o-phenylenediamine (OPD) to generate a new fluorescence emission peak of 2,3-diaminopenazine (ADP) at 570 nm. Therefore, a turn-on fluorescence method for the detection of Hg2+ was established. As the addition of Cl− can influence the fluorescence of ADP, the fluorescence intensity was constantly quenched to achieve the continuous quantitative detection of Cl−. Therefore, a turn-off fluorescence method for the detection of Cl− was established. This method had good linear ranges for the detection of Hg2+ and Cl− in 8.0–200.0 nM and 5.0–350.0 µM, with a detection limit of 0.8 nM and 27 nM, respectively. Depending on the color change with the detection of Hg2+ and Cl−, a convenient on-site colorimetric method for an analysis of Hg2+ and Cl− was achieved by using digital images combined with smartphones (color recognizers). The digital picture sensor could analyze RGB values in concentrations of Hg2+ or Cl− via a smartphone app. In summary, the proposed Au/Cu/Ti3C2 NSs-based method provided a novel and more comprehensive application for environmental monitoring.
Enzyme-Instructed Aggregation/Dispersion of Fluorophores for Near-Infrared Fluorescence Imaging In Vivo
Authors: Zhang Zhipeng , Chen Peiyao , Sun Yao
Published: July 2023

Near-infrared (NIR) fluorescence is a noninvasive, highly sensitive, and high-resolution modality with great potential for in vivo imaging. Compared with “Always-On” probes, activatable NIR fluorescent probes with “Turn-Off/On” or “Ratiometric” fluorescent signals at target sites exhibit better signal-to-noise ratio (SNR), wherein enzymes are one of the ideal triggers for probe activation, which play vital roles in a variety of biological processes. In this review, we provide an overview of enzyme-activatable NIR fluorescent probes and concentrate on the design strategies and sensing mechanisms. We focus on the aggregation/dispersion state of fluorophores after the interaction of probes and enzymes and finally discuss the current challenges and provide some perspective ideas for the construction of enzyme-activatable NIR fluorescent probes.
Research on the Mechanism of Low-Temperature Oxidation of Asphaltene
Authors: Zhao Zhengchong , Yang Haiyang , He Jingjing , Hu Fuqiang , Cheng Fan , Liu Hai , Gong Chunli , Wen Sheng
Published: July 2023

Asphaltene extracted from heavy oil was oxidized by a mixture of propionic anhydride and hydrogen peroxide at a low temperature of 50 °C. Elemental analysis, infrared analysis, proton nuclear magnetic resonance analysis, and gas chromatograph/mass spectrometer analysis results indicated that oxygen addition, side chain cleavage, and condensation reactions mainly occurred in the oxidation process. The oxidation products were divided into 28% methanol solubles and 72% methanol insolubles. There were mainly fatty acids and fatty acid esters in the methanol solubles. There were also small amounts of aromatic compounds with low condensation in the methanol solubles, and the alkyl side chains were mostly short ones. The degree of aromatic ring condensation in the methanol insolubles was slightly higher than that of the pristine asphaltene. There were still some long unbroken chains in the methanol insolubles after the low-temperature reaction. The molecular dynamics simulation results show that the distribution of propionic anhydride around the asphaltene molecules can promote the oxidation of asphaltene. This low-temperature oxidation technology can be used to process asphaltenes to improve the profitability of heavy-oil-processing enterprises.
Inhibitory Potential of Quercetin Derivatives Isolated from the Aerial Parts of Siegesbeckia pubescens Makino against Bacterial Neuraminidase
Authors: Son Yun Gon , Kim Ju Yeon , Park Jae Yeon , Kim Kwang Dong , Park Ki Hun , Kim Jeong Yoon
Published: July 2023

This study aimed to isolate bacterial neuraminidase (BNA) inhibitory O-methylated quercetin derivatives from the aerial parts of S. pubescens. All the isolated compounds were identified as O-methylated quercetin (1–4), which were exhibited to be noncompetitive inhibitors against BNA, with IC50 ranging from 14.0 to 84.1 μM. The responsible compounds (1–4) showed a significant correlation between BNA inhibitory effects and the number of O-methyl groups on quercetin; mono (1, IC50 = 14.0 μM) > di (2 and 3, IC50 = 24.3 and 25.8 μM) > tri (4, IC50 = 84.1 μM). In addition, the binding affinities between BNA and inhibitors (1–4) were also examined by fluorescence quenching effect with the related constants (KSV, KA, and n). The most active inhibitor 1 possessed a KSV with 0.0252 × 105 L mol−1. Furthermore, the relative distribution of BNA inhibitory O-methylated quercetins (1–4) in S. pubescens extract was evaluated using LC-Q-TOF/MS analysis.
Affinity of Tannins to Cellulose: A Chromatographic Tool for Revealing Structure-Activity Patterns
Authors: Suominen Essi , Savila Santeri , Sillanpää Mimosa , Damlin Pia , Karonen Maarit
Published: July 2023

Food, feed and beverage processing brings tannins into contact with macromolecules, such as proteins and polysaccharides, leading to different chemical and physical interactions. The interactions of tannins with proteins are well known but less is known about the affinity of tannins to polysaccharides. We used bacterial cellulose from nata de coco as a model compound to investigate how tannins and cellulose interact by adsorption measurements using UPLC-DAD. We also explored how the structure of tannins influences these interactions. The model tannins included nine individual structurally different hydrolysable tannins (HTs) and eight well-defined proanthocyanidin (PA) fractions with different monomeric units, mean degree of polymerization and both A- and B-type linkages. Tannins were found to have both strong and weak interactions with bacterial cellulose, depending on the exact structure of the tannin. For HTs, the main structural features affecting the interactions were the structural flexibility of the HT molecule and the number of free galloyl groups. For PAs, prodelphinidins were found to have a higher affinity to cellulose than procyanidins. Similarly to HTs, the presence of free galloyl groups in galloylated PAs and the flexibility of the PA molecule led to a stronger interaction. Adsorption measurements by UPLC-DAD proved to be a sensitive and rapid tool to evaluate the affinity of tannins to cellulose.
Structure and Properties of Carboxylated Carbon Nanotubes@Expanded Graphite/Polyethersulfone Composite Bipolar Plates for PEM
Authors: Li Wenkai , Zhao Yixin , Pan Xingchen , Liu Mingqi , Qiu Shi , Xie Zhiyong
Published: July 2023

Composite bipolar plates (BPs) hinder their application in proton exchange membrane fuel cells (PEMFC) because of their poor conductivity and mechanical properties. Nanofillers can effectively solve this problem but often have a limited effect due to their easy agglomeration. In this work, a continuous mesh carboxylated multi-walled carbon nanotube (MWCNT) coating on the surface of graphite was synthesized by chemical vapor deposition (CVD) and carboxylation modification, and the composite BPs were prepared by molding using prepared reticulated carboxylated MWCNTs, expanded graphite, and resin. By optimizing the carboxylation treatment time and the content of the nano-filler, the composite BPs had the best performance at a 15 min carboxylation treatment time and 2.4% filler content. The planar conductivity reached up to 243.52 S/cm, while the flexural strength increased to 61.9 MPa. The thermal conductivity and hydrophobicity were improved compared with the conventional graphite/resin composite BPs, and good corrosion resistance has been demonstrated under the PEMFC operating environment. This work provides a novel nanofiller modification paradigm for PBs.
Synthesis of Multiple Emission Carbon Dots from Dihydroxybenzoic Acid via Decarboxylation Process
Authors: Li Pengfei , Xu Jijian , Shen Ziye , Liu Wenning , An Li , Qu Dan , Wang Xiayan , Sun Zaicheng
Published: July 2023

Carbon dots (CDs), as a new zero-dimensional carbon-based nanomaterial with desirable optical properties, exhibit great potential for many application fields. However, the preparation technique of multiple emission CDs with high yield is difficult and complex. Therefore, exploring the large-scale and straightforward synthesis of multicolor CDs from a simple carbon source is necessary. In this work, the solvent-free method prepares a series of multicolor emission CDs from dihydroxybenzoic acid (DHBA). The maximum emission wavelengths are 408, 445, 553, 580, and 610 nm, respectively, covering the visible light region. The 2,4- and 2,6-CDs possess the longer emission wavelength caused by the 2,4-, and 2,6-DHBA easily undergo decarboxylation to form the larger sp2 domain graphitized structure. These CDs incorporated with g-C3N4 can significantly improve the photocatalytic water-splitting hydrogen production rate by extending the visible light absorption and enhancing the charge separation efficiency. The long-wavelength emission CDs can further enhance photocatalytic activity primarily by improving visible light absorption efficiency.
Community Empowerment Assessment and Community Nursing Diagnosis for Climate Change Mitigation and Adaptation in the Northern Region of the Portuguese Atlantic Coast: A Mixed-Methods Study Using MAIEC Framework
Authors: Salvador Costa Maria João , Melo Pedro
Published: July 2023

The Community Intervention and Empowerment Assessment Model (MAIEC) offers a framework for community empowerment in several fields such as Climate Change (CC), the largest health emergency crisis globally, through diagnosis and interventions in Community Health Nursing. This study aims to assess the level of community empowerment in climate change mitigation and adaptation, and to identify nursing diagnosis through the MAIEC clinical decision matrix, within a local intermunicipal association in the northern region of the Portuguese Atlantic Coast. A convergent mixed-methods design was used, applying a focus group technique to a purposive sampling of ten key stakeholders of this community. A Portuguese version of the Empowerment Assessment Rating Scale and a questionnaire were both applied to the same participants, and qualitative and quantitative data generated were analysed using a content analysis technique and an Excel database sheet created using Microsoft Office 365. The analysis of the Portuguese northern community exposed: a low level of community empowerment for mitigation and adaptation to climate change; a nursing diagnosis of community management impairments in several dimensions, such as community process, community participation and community leadership. However, the study confirmed that MAIEC contributed to future community-based solutions, responding to the challenges of climate change, and enabling the planning of interventions to address MAIEC diagnoses in the form of CC-specific training and recommendations for new cooperation approaches from all stakeholders. This study was not registered.
Regulating Terahertz Photoconductivity in Two-Dimensional Materials
Authors: Xing Xiao , Zhang Zeyu , Ma Guohong
Published: July 2023

Two-dimensional materials represented by graphene have attracted extensive interest owing to the unique layer-dependent physical properties that are tunable with various external fields. In addition, by stacking two or more 2D materials together, a new material with the desired properties can be tailored and designed. Fully understanding the dynamical photoconductive response in 2D materials is uttermost important to design and develop the advanced optoelectronic devices. Terahertz (THz) time-domain spectroscopy (TDS) and time-resolved THz spectroscopy are powerful spectroscopic tools with the advantages of being contact-free and noninvasive, which have been widely used to study the photoconductivity (PC) of 2D materials. In this review, firstly, we provide a short introduction of the 2D materials and THz spectroscopy, and then a brief introduction of the experimental setup and experimental data analysis based on time-resolved THz spectroscopy are presented. After that, we overview the latest progress on the regulation of the THz PC that includes: (1) regulating the THz PC of graphene (Gr) and transition metal dichalcogenide (TMD) thin films with oxygen adsorption; (2) regulating the THz PC of Gr and Gr/TMDs heterostructures by electric gating and a built-in field introduced by a substrate; (3) regulating the THz PC of Gr/TMD heterostructures via optical gating; and (4) we overview the latest progress on the observation of elementary excitations in 2D materials with THz PC spectra following optical excitation and THz PC regulation via the photoexcitation of quasi-particles. Finally, we conclude the review and present a short overview of future research directions.
Iodine-Biofortified Microgreens as High Nutraceutical Value Component of Space Mission Crew Diets and Candidate for Extraterrestrial Cultivation
Authors: Giordano Maria , Ciriello Michele , Formisano Luigi , El-Nakhel Christophe , Pannico Antonio , Graziani Giulia , Ritieni Alberto , Kyriacou Marios C. , Rouphael Youssef , De Pascale Stefania
Published: July 2023

The success of Space missions and the efficacy of colonizing extraterrestrial environments depends on ensuring adequate nutrition for astronauts and autonomy from terrestrial resources. A balanced diet incorporating premium quality fresh foods, such as microgreens, is essential to the mental and physical well-being of mission crews. To improve the nutritional intake of astronaut meals, two levels of potassium iodide (KI; 4 µM and 8 µM) and an untreated control were assessed for iodine (I) biofortification, and overall nutraceutical profile of four microgreens: tatsoi (Brassica rapa L. subsp. narinosa), coriander (Coriandrum sativum L.), green basil, and purple basil (Ocimum basilicum L.). A dose-dependent increase in I was observed at 8 µM for all species, reaching concentrations of 200.73, 118.17, 93.97, and 82.70 mg kg−1 of dry weight, in tatsoi, coriander, purple basil, and green basil, respectively. Across species, I biofortification slightly reduced fresh yield (–7.98%) while increasing the antioxidant activity (ABTS, FRAP, and DPPH). LC–MS/MS Q extractive orbitrap analysis detected 10 phenolic acids and 23 flavonoids among microgreen species. The total concentration of phenolic acids increased (+28.5%) in purple basil at 8 µM KI, while total flavonoids in coriander increased by 23.22% and 34.46% in response to 4 and 8 µM KI, respectively. Both doses of KI increased the concentration of total polyphenols in all species by an average of 17.45%, compared to the control.
Signal Mediators in the Implementation of Jasmonic Acid’s Protective Effect on Plants under Abiotic Stresses
Authors: Kolupaev Yuriy E. , Yastreb Tetiana O. , Dmitriev Alexander P.
Published: July 2023

Plant cells respond to stress by activating signaling and regulatory networks that include plant hormones and numerous mediators of non-hormonal nature. These include the universal intracellular messenger calcium, reactive oxygen species (ROS), gasotransmitters, small gaseous molecules synthesized by living organisms, and signal functions such as nitrogen monoxide (NO), hydrogen sulfide (H2S), carbon monoxide (CO), and others. This review focuses on the role of functional linkages of jasmonic acid and jasmonate signaling components with gasotransmitters and other signaling mediators, as well as some stress metabolites, in the regulation of plant adaptive responses to abiotic stressors. Data on the involvement of NO, H2S, and CO in the regulation of jasmonic acid formation in plant cells and its signal transduction were analyzed. The possible involvement of the protein components of jasmonate signaling in stress-protective gasotransmitter effects is discussed. Emphasis is placed on the significance of the functional interaction between jasmonic acid and signaling mediators in the regulation of the antioxidant system, stomatal apparatus, and other processes important for plant adaptation to abiotic stresses.
VPBR: An Automatic and Low-Cost Vision-Based Biophysical Properties Recognition Pipeline for Pumpkin
Authors: Dang L. Minh , Nadeem Muhammad , Nguyen Tan N. , Park Han Yong , Lee O New , Song Hyoung-Kyu , Moon Hyeonjoon
Published: July 2023

Pumpkins are a nutritious and globally enjoyed fruit for their rich and earthy flavor. The biophysical properties of pumpkins play an important role in determining their yield. However, manual in-field techniques for monitoring these properties can be time-consuming and labor-intensive. To address this, this research introduces a novel approach that feeds high-resolution pumpkin images to train a mathematical model to automate the measurement of each pumpkin’s biophysical properties. Color correction was performed on the dataset using a color-checker panel to minimize the impact of varying light conditions on the RGB images. A segmentation model was then trained to effectively recognize two fundamental components of each pumpkin: the fruit and vine. Real-life measurements of various biophysical properties, including fruit length, fruit width, stem length, stem width and fruit peel color, were computed and compared with manual measurements. The experimental results on 10 different pumpkin samples revealed that the framework obtained a small average mean absolute percentage error (MAPE) of 2.5% compared to the manual method, highlighting the potential of this approach as a faster and more efficient alternative to conventional techniques for monitoring the biophysical properties of pumpkins.
Physical Processes That Occur in Self-Organized Tokamak Plasma
Authors: Razumova Ksenia A. , Lysenko Sergey E.
Published: July 2023

Processes associated with plasma self-organization in tokamaks are presented in the possible logical sequence. The resulting picture of physical processes in self-organized plasmas is predicted based on the nonrequiibrium thermodynamic approach, which uses the Smoluchowski-type equation for the energy balance. The self-organization of magnetized plasma leads to the formation of the universal MHD structure, where the normalized pressure profiles are similar. Finally, experimental confirmation of the proposed physical picture in magnetic fusion facilities is given.
Influence of Hydrogen Bonding on the Photophysical Properties of Diethylamino Hydroxybenzoyl Hexyl Benzoate
Authors: Zhang Qianjie , Lv Qing , Zhang Dongmei , Jiang Wen , Zhang Huiwen , Zhang Wanping
Published: July 2023

In this study, we investigated the effects of different hydrogen bond types on the photophysical properties of diethylamino hydroxybenzoyl hexyl benzoate (DHHB) by systematically exploring the changes in the spectral properties of DHHB in protic and aprotic solvents. The formation and stability of hydrogen bonds were also studied, demonstrating that the system mainly existed in the form of intramolecular hydrogen bonds at low concentrations (≤5 μg/mL). In these circumstances, the fluorescent intensity, and molar absorption coefficient changed little, indicating that the intramolecular hydrogen bonds had little effect on the spectral properties of DHHB. With an increase in concentration, the number of intermolecular hydrogen bonds increased and the molar absorption coefficient significantly increased, indicating that the intermolecular hydrogen bonds were conducive to improving the UV absorption properties of DHHB. With an increase in temperature, the molar absorption coefficient of the system decreased, which reduced the UV absorption performance of DHHB. In the protic solvent, the system also contained DHHB–solvent intermolecular hydrogen bonds. With an increase in the proportion of protic solvent in the system, the fluorescent intensity of the system significantly decreased, and the UV integral area significantly increased, indicating that the hydrogen bond between DHHB and the solvent molecules was beneficial in terms of improving the UV absorption performance of DHHB.
Experimental Study on Gas Explosion Propagation in Porous Metal Materials
Authors: Jia Zhenzhen , Ye Qing
Published: July 2023

Serious damage and large losses often result from gas explosions in coal mining. However, porous metal materials can suppress a gas explosion and its propagation. Therefore, a gas explosion and its propagation suppression characteristics of porous metal materials are analyzed theoretically. According to the propagation characteristics of a gas explosion in duct, a gas-explosion experiment system with porous metal material (steel wire mesh) is constructed in this paper, and the propagations of explosion wave and flame in porous metal materials are experimentally studied. The study results show that the flame propagation velocity and overpressure of explosion wave are related to the length and layer number of porous metal materials. When the gas explosion propagates a certain distance in porous metal materials, the flame and explosion wave begin to be attenuated. The longer the length of porous metal material is, the better the attenuation effect is. At the same time, the more layer numbers, the better the attenuation effect is. In this experiment, the maximum decreases of explosion wave overpressure and flame propagation velocity are 84% and 91%, respectively. The attenuation of the explosion wave overpressure and the flame propagation velocity has synchronism and correspondence during gas explosion propagation in porous metal materials. The experimental results show the porous metal material has a good suppression effect on gas explosion propagation. The study results can provide an experimental basis for the development of gas explosion propagation suppression technology and devices, and have a great practical significance for the prevention and control of a gas explosion disaster.
A Fault Diagnosis Analysis of Afterburner Failure of Aeroengine Based on Fault Tree
Authors: He Ai , Zeng Qinghua , Zhang You , Xie Pengfu , Li Jianping , Gao Ming
Published: July 2023

The afterburner is essential for military aeroengines, providing rapid thrust increase during critical maneuvers. However, complex failure mechanisms pose challenges for fault diagnosis and troubleshooting. This study investigates a specific aviation engine’s afterburner engagement principle and typical faults, using fault tree analysis and computational fluid dynamics (CFD). We propose a hybrid diagnostic fault architecture combining traditional observer fault diagnosis with fault trees for online fault diagnosis of critical faults. Simulations and test bench verification confirm the feasibility and effectiveness of our approach, offering valuable insights and guidance for addressing afterburner engagement issues in aviation engines.
Spiritual Growth of Said Nursi and Aleksander Solzhenitsyn in Prison
Authors: Albayrak Ismail
Published: July 2023

The article explores the approaches of individuals from two different religious traditions regarding prison spirituality: Said Nursi, who received a comprehensive classical education and furthered his knowledge through modern education, and A. Solzhenitsyn, who initially grew up as an atheist but rediscovered his religious upbringing while imprisoned, subsequently strengthening his spirituality over time. The research objectives of this article are to delve into the personal, intellectual, and spiritual transformations of these two influential figures during their time in prison, examining their pursuit of inner peace and the expansion of the heart. Additionally, it analyzes their development in parallel with the works they wrote. The experience of incarceration provided them with an opportunity to reflect on their own lives, independently of each other, and diagnose the societal issues prevalent in their respective times, such as atheism, materialism, hedonism, lack of spirituality, and excessive consumption. They then attempted to propose and develop solutions to these issues, not only for their immediate circles but also for the wider public. Thus, it is useful to identify these commonalities and differences, and then, discuss them from the comparative theological perspective set up by Francis J. Clooney, S.J. Their profound understanding of this crucial task of improving the lives of others enabled them to endure the hardships of prison and transform its detrimental effects into more fruitful endeavors. While there are similarities in their reflections on faith and the human condition, there are also notable differences in their approaches and perspectives. Nursi’s prison spirituality centered on Islamic teachings and the pursuit of religious knowledge, while Solzhenitsyn’s focused on ethical, moral, and existential evaluations in the context of atheistic and authoritarian regimes.
The Risk Landscape in the Digital Transformation of Finance and Insurance
Authors: Rupeika-Apoga Ramona , Marano Pierpaolo
Published: July 2023

“The Risk Landscape in the Digital Transformation of Finance and Insurance” is a Special Issue that explores the opportunities and challenges arising from the integration of emerging technologies in the finance and insurance sectors [...]
MJ-GAN: Generative Adversarial Network with Multi-Grained Feature Extraction and Joint Attention Fusion for Infrared and Visible Image Fusion
Authors: Yang Danqing , Wang Xiaorui , Zhu Naibo , Li Shuang , Hou Na
Published: July 2023

The challenging issues in infrared and visible image fusion (IVIF) are extracting and fusing as much useful information as possible contained in the source images, namely, the rich textures in visible images and the significant contrast in infrared images. Existing fusion methods cannot address this problem well due to the handcrafted fusion operations and the extraction of features only from a single scale. In this work, we solve the problems of insufficient information extraction and fusion from another perspective to overcome the difficulties in lacking textures and unhighlighted targets in fused images. We propose a multi-scale feature extraction (MFE) and joint attention fusion (JAF) based end-to-end method using a generative adversarial network (MJ-GAN) framework for the aim of IVIF. The MFE modules are embedded in the two-stream structure-based generator in a densely connected manner to comprehensively extract multi-grained deep features from the source image pairs and reuse them during reconstruction. Moreover, an improved self-attention structure is introduced into the MFEs to enhance the pertinence among multi-grained features. The merging procedure for salient and important features is conducted via the JAF network in a feature recalibration manner, which also produces the fused image in a reasonable manner. Eventually, we can reconstruct a primary fused image with the major infrared radiometric information and a small amount of visible texture information via a single decoder network. The dual discriminator with strong discriminative power can add more texture and contrast information to the final fused image. Extensive experiments on four publicly available datasets show that the proposed method ultimately achieves phenomenal performance in both visual quality and quantitative assessment compared with nine leading algorithms.
Do Foreign Direct Investment Inflows in the Producer Service Sector Promote Green Total Factor Productivity? Evidence from China
Authors: Sun Yixing , Zhang Mingyang , Zhu Yicheng
Published: July 2023

By exploring feasible pathways for coordinating the ecological environment and economic development, this study investigated the impact of FDI in the producer service sector (SFDI) on green total factor productivity (GTFP) across 20 provinces from 2006 to 2019 in China. We employed a panel data regression model and found that SFDI significantly promotes China’s GTFP, verifying the existence of the “pollution halo” effects of SFDI in China, where GTFP is estimated by the global Malmquist–Luenberger productivity index based on the slack-based measure and directional distance function. We also employed mediating and moderating models to test the mechanism and found that SFDI can affect GTFP through competition, green innovation, and resource allocation mechanisms. Notably, the impact of SFDI on GTFP exhibits regional heterogeneity, with the strongest impact observed in the eastern region, followed by the western region, and the weakest in the central region. Further analysis reveals that the enhancement of environmental regulations and the level of factor marketization can amplify the influence of SFDI. Finally, we offer specific recommendations encompassing the enhancement of openness, improvement of factor markets, and strengthening of environmental regulations.
Regenerating Iron-Based Adsorptive Media Used for Removing Arsenic from Water
Authors: Ceccarelli Ilaria , Filoni Luca , Poli Massimiliano , Apollonio Ciro , Petroselli Andrea
Published: July 2023

Of all the substances that can be present in water intended for human consumption, arsenic (As) is one of the most toxic. Many treatment technologies can be used for removing As from water, for instance, adsorption onto iron media, where commercially available adsorbents are removed and replaced with new media when they are exhausted. Since this is an expensive operation, in this work, a novel and portable plant for regenerating iron media has been developed and tested in four real case studies in Central Italy. The obtained results highlight the good efficiency of the system, which was able, from 2019 to 2023, to regenerate the iron media and to restore its capability to adsorb the As from water almost entirely. Indeed, when the legal threshold value of 10 μg/L is exceeded, the regeneration process is performed and, after that, the As concentration in the water effluent is at the minimum level in all the investigated case studies.
Clinical Quality Control of MRI Total Kidney Volume Measurements in Autosomal Dominant Polycystic Kidney Disease
Authors: Zhu Chenglin , Dev Hreedi , Sharbatdaran Arman , He Xinzi , Shimonov Daniil , Chevalier James M. , Blumenfeld Jon D. , Wang Yi , Teichman Kurt , Shih George , Goel Akshay , Prince Martin R.
Published: July 2023

Total kidney volume measured on MRI is an important biomarker for assessing the progression of autosomal dominant polycystic kidney disease and response to treatment. However, we have noticed that there can be substantial differences in the kidney volume measurements obtained from the various pulse sequences commonly included in an MRI exam. Here we examine kidney volume measurement variability among five commonly acquired MRI pulse sequences in abdominal MRI exams in 105 patients with ADPKD. Right and left kidney volumes were independently measured by three expert observers using model-assisted segmentation for axial T2, coronal T2, axial single-shot fast spin echo (SSFP), coronal SSFP, and axial 3D T1 images obtained on a single MRI from ADPKD patients. Outlier measurements were analyzed for data acquisition errors. Most of the outlier values (88%) were due to breathing during scanning causing slice misregistration with gaps or duplication of imaging slices (n = 35), slice misregistration from using multiple breath holds during acquisition (n = 25), composing of two overlapping acquisitions (n = 17), or kidneys not entirely within the field of view (n = 4). After excluding outlier measurements, the coefficient of variation among the five measurements decreased from 4.6% pre to 3.2%. Compared to the average of all sequences without errors, TKV measured on axial and coronal T2 weighted imaging were 1.2% and 1.8% greater, axial SSFP was 0.4% greater, coronal SSFP was 1.7% lower and axial T1 was 1.5% lower than the mean, indicating intrinsic measurement biases related to the different MRI contrast mechanisms. In conclusion, MRI data acquisition errors are common but can be identified using outlier analysis and excluded to improve organ volume measurement consistency. Bias toward larger volume measurements on T2 sequences and smaller volumes on axial T1 sequences can also be mitigated by averaging data from all error-free sequences acquired.
Stability of Drinking Water Distribution Systems and Control of Disinfection By-Products
Authors: Zhou Qingwei , Bian Zhengfu , Yang Dejun , Fu Li
Published: July 2023

The stability of drinking water distribution systems and the management of disinfection by-products are critical to ensuring public health safety. In this paper, the interrelationships between corrosion products in the network, microbes, and drinking water quality are elucidated. This review also discusses the mechanisms through which corrosive by-products from the piping network influence the decay of disinfectants and the formation of harmful disinfection by-products. Factors such as copper corrosion by-products, CuO, Cu2O, and Cu2+ play a significant role in accelerating disinfectant decay and catalyzing the production of by-products. Biofilms on pipe walls react with residual chlorine, leading to the formation of disinfection by-products (DBPs) that also amplify health risks. Finally, this paper finally highlights the potential of peroxymonosulfate (PMS), an industrial oxidant, as a disinfectant that can reduce DBP formation, while acknowledging the risks associated with its corrosive nature. Overall, the impact of the corrosive by-products of pipe scale and microbial communities on water quality in pipe networks is discussed, and recommendations for removing DBPs are presented.
Internet-Purchased Sodium Azide Used in a Fatal Suicide Attempt: A Case Report and Review of the Literature
Authors: van der Heijden Lisa T. , van den Hondel Karen E. , Olyslager Erik J. H. , de Jong Lutea A. A. , Reijnders Udo J. L. , Franssen Eric J. F.
Published: July 2023

There has been a significant increase in sodium azide intoxications since the 1980s. Intoxications caused by sodium azide are becoming increasingly prevalent in the Netherlands as a result of its promotion for the purpose of self-euthanasia. The mechanism of toxicity is not completely understood but is dose-dependent. The presented case describes a suicide by sodium azide of a young woman (26 years old) with a history of depression and suicide attempts. The decedent was found in the presence of prescription medicine, including temazepam, domperidone in combination with omeprazole, and the chemical preservative sodium azide. Quantitative toxicology screening of whole blood revealed the presence of 70 µg/L temazepam (toxic range > 1000 µg/L) and 28 mg/L sodium azide (fatal range: 2.6–262 mg/L). Whole blood qualitative analysis revealed the presence of temazepam, temazepam-glucuronide, olanzapine, n-desmethylolanzapine, and acetaminophen. In circles promoting sodium azide, it is recommended to use sodium azide in combination with medications targeting sodium azide’s negative effects, such as analgesics, antiemetics, and anti-anxiety drugs. The medicines recovered at the body’s location, as well as the results of the toxicology screens, were consistent with the recommendations of self-euthanasia using sodium azide.
Long-Term Results of Immunogenicity of Booster Vaccination against SARS-CoV-2 (Hybrid COV-RAPEL TR Study) in Turkiye: A Double-Blind, Randomized, Controlled, Multicenter Phase 2 Clinical Study
Authors: Ates Ihsan , Batirel Ayse , Aydin Mehtap , Karadag Fatma Yilmaz , Erden Abdulsamet , Kucuksahin Orhan , Armagan Berkan , Guven Serdar Can , Karakas Ozlem , Gokdemir Selim , Altunal Lutfiye Nilsun , Buber Aslihan Ayse , Gemcioglu Emin , Zengin Oguzhan , Inan Osman , Sahiner Enes Seyda , Korukluoglu Gulay , Sezer Zafer , Ozdarendeli Aykut , Omma Ahmet , Kara Ates
Published: July 2023

The immunogenicity of vaccines decreases over time, causing a need for booster doses. This study aimed to present the long-term (Day 84) immunogenicity results of the double-blind, randomized, controlled, phase II Hybrid COV-RAPEL TR Study (NCT04979949), in which the TURKOVAC or CoronaVac vaccines were used as a booster after the second dose of primary vaccination with CoronaVac. A total of 190 participants from the Hybrid COV-RAPEL TR Study, who had both Day 28 and Day 84 immunogenicity results, were included. The immunogenicity on Day 84, regarding the neutralizing antibody positivity (Wuhan and Delta variants) and anti-spike immunoglobulin (Ig) G (IgG) antibody positivity, was compared between TURKOVAC and CoronaVac vaccine arms according to sex and age groups. Overall, antibody positivity showed a slight decrease on Day 84 vs. Day 28, but was not different between TURKOVAC and CoronaVac arms either for sexes or for age groups. However, TURKOVAC produced better antibody response against the Delta variant than CoronaVac, while CoronaVac was superior over TURKOVAC regarding neutralizing antibody positivity in the 50–60 years age group, regardless of the variant. A single booster dose, after the completion of the primary vaccination, increases antibody positivity on Day 28 which persists until Day 84 with a slight decrease. However, an additional booster dose may be required thereafter, since the decrease in antibody titer may be faster over time.
Circulating Current Suppression Strategy Based on Virtual Impedance and Repetitive Controller for Modular Multilevel Converter Upper and Lower Bridge Arm Capacitance Parameter Asymmetry Conditions
Authors: Yao Mincheng , Ni Hongyu , Zhao Feng , Wang Wenyuan , Yan Wenxu
Published: July 2023

In recent years, modular multilevel converters (MMCs) have been increasingly used in the field of electric vehicle charging and discharging due to their unique performance advantages. However, the unique cascade structure of MMCs raises the problem of the circulating current. Due to chemical processes, aging effects, etc., the capacitance parameters of the upper and lower bridge arms will be asymmetric, which will introduce odd harmonics into the circulating current, increasing system losses and threatening the system reliability. To address this phenomenon, this paper proposes a circulating current suppression strategy with additional virtual impedance (VI) based on a repetitive controller (RC). The corresponding simulation models were built for the comparative study of different circulating current suppression strategies. The results show that the VI-RC circulating current suppression strategy can significantly reduce the odd and even harmonics in the circulating current under asymmetric conditions, and the total harmonic distortion (THD) of the bridge arm current is only 0.98%, which verifies the effectiveness of the proposed strategy.
PRINCIPLES OF URBAN PLANNING ORGANIZATION OF THE PARK IN IRKUTSK
Authors: Tikunova S. , Kalinina G. , Bolshakov A. , Oreshkina S. , Sheremet Alena
Published: July 2023

The article examines the authors' design research aimed at forming a modern interpretation of visual communications as one of the fundamental principles of forming a comfortable urban space for life. The main part of the material is devoted to the study of the visual field of the urban environment and its development, taking into account anthropological and socio-cultural patterns. The features of the visual space in a large modern city immersed in the digital age are analyzed. This makes it possible to identify environmental opportunities by creating a navigation system, to master the means and examples of visual and artistic formation of the urban environment. Identification of the author's view on the architectural and urban situation of the regions, and proposals for the development of a more effective urban development strategy.