bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analytical study of soliton dynamics in the realm of fractional extended shallow water wave equations
Authors: Ali Rashid , Barak Shoaib , Altalbe Ali 
Published: May 2024

Abstract
In this study, we use the Khater Method (KM) as an efficient analytical tool to solve (3+1)-dimensional fractional extended shallow water wave equations (FESWWEs) with conformable derivatives. The KM transforms fractional partial differential equations to ordinary differential equations (ODEs) via strategic variable transformation. Then, series-form solutions to these ODEs are proposed, which turn them into nonlinear algebraic systems. The solution to this set of algebraic equations yields shock travelling wave solutions expressed in hyperbolic, trigonometric, exponential, and rational functions. The study’s findings are corroborated by 2D, 3D, and contour graphs that show the changing patterns of the detected shock travelling waves. These findings have important significance for the discipline, offering vital insights into the intricate dynamics of FESWWEs. The effectiveness of KM is demonstrated by its capacity to produce varied solutions and contribute to a thorough knowledge of such complex phenomena.
Ab initio calculation of electronic and optical properties of vdWHs HfX2/BSb(X = Se,S) using density functional theory
Authors: Al-Shammari Abbas Sahib Idan , Arghavani Nia Borhan , Rezaee Sahar 
Published: May 2024

Abstract
Recently, another series of two-dimensional (2D) materials called van der Waals heterostructures (vdWhs) have attracted a lot of attention due to their outstanding properties and wide application in electronic and optical devices. Based on density functional theory (DFT) calculations, the properties of heterostructures were investigated with two different vertical arrangements, formed by two isolated sheets of HfX2(X = Se,S) and Boron antimonide(BSb) monolayer. In particular, vdW interactions are present in all these heterostructures rather than covalent bonding. All thevdWHsare semiconductor with indirect k-M band gap, for which the HSE06 functional exhibit a larger gap, but the electronic gap of all heterostructures is smaller than the electronic gap of their constituent sheets. In addition, all vdWHs show excellent optical absorption in the visible, near-infrared, and ultraviolet regions in the x direction, while the absorption peaks for all vdWHs are higher in the z direction. By fabricating heterostructures from isolated plates, their absorption power increases. The present review demonstrates an effective method for the design of novel vdWHs, and it explores their applications for photocatalytic, photovoltaic, and optical devices.
Sound absorber based on a sonic black hole and multi-layer micro-perforated panels
Authors: Liang Xiao , Liang Haofeng , Chu Jiaming , Jin Feng , Wu Jiuhui 
Published: May 2024

Abstract
In order to achieve low-frequency and broadband sound absorption simultaneously, we propose a structure that combines a sonic black hole with multilayer micro-perforated panels. Firstly, we present finite element models for composite structures based on sonic black holes and micro-perforated panels and describe the sound absorption mechanism of the composite structure by comparing the sound absorption phenomena of micro-perforated panels with sonic black holes and micro-perforated panels with ordinary circular tubes. Secondly, the effects of the end coordinates of the sonic black hole, the number of panels and the parameters of the micro-perforated panels are discussed. Thirdly, the theoretical model of the proposed structure is developed using the transfer matrix method. Finally, the sound absorption test of the proposed structure is carried out using impedance tubes. The test results show that the sound absorption coefficient of the sample with a geometric length of 203 mm reaches 0.8 at 223 Hz and stabilizes above 0.9 at 398–1600 Hz. The sound absorber based on a sonic black hole and multi-layer micro-perforated panels has excellent sound absorption performance and has great research potential and application value.
Highly sensitive rhodamine B dye-based electrochemical sensor for lactose detection
Authors: Yıldız Dilber Esra , Taşaltın Nevin , Unal Fatma , Karakuş Selcan , Barıs Behzat 
Published: May 2024

Abstract
Lactose (LAC) is the main disaccharide sugar found in milk and dairy products, making it easily accessible as a food source. In addition to its importance for human and animal health, LAC concentrations serve as a biomarker of milk quality. In this study, we reported the detection of LAC using a highly sensitive electrochemical sensor based on rhodamine B (RhB) dye. The prepared RhB-based sensor exhibited excellent characteristics, including a straightforward manufacturing technique, cost-effectiveness, and exceptional sensitivity. We conducted a comparative analysis of the electrochemical response of the novel RhB-based sensor, evaluating its electrochemical performance across varying LAC concentrations and when different analyte materials (glucose, fructose, and maltose) were employed. The proposed analytical method was utilized to determine LAC using an electrochemical RhB-based sensor under optimal experimental conditions. As a result, it was experimentally observed that high sensor sensitivity of RhB based sensor against LAC was inversely proportional to the impedance value and directly proportional to conductance which corolated with the transport mechanism of RhB.
Imaging thick accretion disks and jets surrounding black holes
Authors: Zhang Zhenyu , Hou Yehui , Guo Minyong , Chen Bin 
Published: May 2024

Abstract
Based on the horizon-scale magnetofluid model developed in [1], we
investigate the millimeter-wave images of a geometrically thick accretion disk or a funnel wall,
i.e., the magnetofluid that encloses the base of the jet region, around a Kerr black hole. By
employing the numerical method to solve the null geodesic and radiative transfer equations, we
obtain the optical appearances at various observational angles and frequencies, generated by the
thermal synchrotron radiation within the magnetofluid. For the thick disk, we specifically examine
the impact of emission anisotropy on images, concluding that anisotropic synchrotron radiation
could play an important role in the observability of the photon ring. For the funnel wall, we find
that both the outflow and inflow funnel walls exhibit annular structures on the imaging plane. The
outflow funnel wall yields a brighter primary image than the photon ring, whereas the inflow one
does not. Based on our investigation, the inflow funnel wall model can not be ruled out by current
observations of M87*.
Entangled states as a probe of early universe history: a Higgs case study
Authors: Baunach Rose 
Published: May 2024

Abstract
I explore whether distinguishing features of phase transitions and/or the inflationary energy scale can be imprinted on cosmological observables due to entanglement during inflation, given a spectator scalar field with a Higgs-like potential. As a consequence of this analysis, I also present results that illustrate the variety of features a Higgs-like spectator can imprint on the primordial power spectrum due to entanglement, as well as how easy it might be to distinguish such spectra from other similar scalar field results at the level of CMB residuals. I utilize the technical framework for dynamically generated entangled states developed in [1,2] to obtain my results.
Agroforestry Implementation as Farmers Resilience Strategies to Support Farming System Sustainability Facing the Land Vulnerability at The Mount Semeru Slopes, Indonesia
Authors: Suhartini  , Lasitya Daffa Sandi , Jihad Baroroh Nur , Mujaddid Muhammad Ashri , Khusni Ahmad 
Published: May 2024

Abstract
The terrain on the slopes of Mount Semeru is characterized by arid conditions and an abundance of sandy soil. This has led to extensive sand mining operations in the area, extending even to privately-owned agricultural lands. These mining activities have generated adverse environmental effects, such as the depletion of vegetation, and pose risks of soil erosion and biodiversity loss. This study aimed to assess the influence of implementing agroforestry as a resilience strategy by farmers on the sustainability of farming systems in response to land vulnerability on the slopes of Mount Semeru. A quantitative approach was employed, and the study site was purposively chosen in Bambang Village, Wajak Sub-District, Malang Regency. The research employed a survey methodology, incorporating observation and interviews with respondents to gather information on the implementation of agroforestry, resilience strategies, and sustainability indicators across ecological, economic, and socio-cultural aspects. The data analysis utilized the Structural Equation Model (SEM). The findings indicate that farmers practicing agroforestry exhibit elevated resilience and enhance the sustainability of their farming systems across ecological, economic, and socio-cultural dimensions.
Green Synthesis of Ag/Mg(OH)2 Nanocomposite from Potato Peel Extract (Solanum tuberosum) and Its Antioxidant Activity
Authors: Ngo D T H , Dau T N A , Vu Y T P , Nguyen L Q 
Published: May 2024

Abstract
Potato peel extract (PPE) is a rich source of polyphenols which could be used as reducing agents for the green synthesis of nanocomposites. The project aims to synthesize Ag/Mg(OH)2 nanocomposites (NCs) by using PPE and investigate its antioxidant activity. The phytochemicals in peel extract act as reducing, stabilizing, and capping agents in the reduction of precursor salts. SEM-EDX analyses of the bio-synthesized Ag/Mg(OH)2 NCs show the formation of Ag nanoparticles (NPs) on the surface of Mg(OH)2 carriers with various sizes in the nanoscale, while XRD patterns suggest the existence of Mg(OH)2 hexagonal crystalline structure. The antioxidant activity of Ag/Mg(OH)2 NCs was assessed through the DPPH free radical scavenging assay with IC50 values between 1.3 and 1.4 mg/mL. Compared to various plant-based Ag NPs, such values are remarkably closer to the IC50 of the standard ascorbic acid (0.6 mg/mL), promoting PPE-based Ag/Mg(OH)2 as an effective and ecofriendly antioxidant.
Actual Adsorptive Efficiency of Aqueous Cr(VI) Using Modified Banana Pseudostems
Authors: Nguyen Minh-Kha , Nguyen Thi-Cam-Anh , Vo Quoc-Anh 
Published: May 2024

Abstract
A wide application of chromium (Cr) in industries has discharged large quantity of Cr(VI) into the environment. Cr(VI) is a strong oxidizing agent that can react rapidly to produce toxic compounds to humans. Various agricultural products and byproducts have been studied for the sorptive removal of Cr(VI). However, less attention has been given to the presence of Cr(III) in solution after the adsorption with significant effect to actual adsorption capacity of the material. Here the Cr(VI) removal efficiency was investigated by using modified banana pseudostems (m-BP). Banana pseudostems were treated with 0.08 M HCl for 4 h and washed thoroughly. The maximum adsorption capacity of Cr(VI) was found at pH 2, adsorbent dose 34 g/L, contact time of 180 min and 100 mg/L initial Cr(VI) concentration. The adsorption efficiency of Cr(VI) onto m-BP was recorded to be 73.6% while the total conversion of Cr(VI) was 99.6%. The adsorption efficiency was lower than the total conversion of Cr(VI) due to the reduction of Cr(VI) to Cr(III) by the presence of organic groups in banana pseudostems. Owing to relatively high efficiency, m-BP can be used as effective and very low cost adsorbent for Cr(VI) removal from wastewater.
Dual Role Of Streptomyces Strains: Reduction of Aeromonas Counts In Both Culture Water And The Intestine, And Growth Enhancement of Discus Fish (Symphysodon sp.)
Authors: Phuc T. D. , Huong N. T. , Dan P. T. T. , Linh B. T. H. , Loan V. T. T. , Hang N. T. B. 
Published: May 2024

Abstract
Discus fish (Symphysodon sp.) brings the largest export turnover to the ornamental fish industry in Vietnam. The intensive farming of discus fish to meet export market demand leads to a higher risk of bacterial disease, with Aeromonas being the main infectious agent. Continuous antibiotic use exerts selective pressure, fostering the emergence of antibiotic-resistant bacterial strains capable of causing diseases in fish. Streptomyces sp. considered as probiotics with the role of replacing antibiotics in applications such as promoting growth, improving survival rates, and controlling pathogenic bacteria in aquaculture. The primary objective of this study was to assess the influence of Streptomyces sp. on the growth performance, and Aeromonas density in intestine of discus fish and in culture water. Discus fish fed diets containing Streptomyces sp. TM1, TM7, and TM22 showed significantly higher growth parameters (45.24 - 58.72% of final body weight - FBW, 14.8 - 16.66% of final body length -FBL, 16.03 – 20.87 % of specific growth rate of weight – SGRW, 10.79 - 12.05 % of specific growth rate of length – SGRL, and 41.48 – 46.54 % of feed conversion ratio – FCR) compared to the control. Additionally, total Aeromonas densities of the fish treated with TM1, TM7, and TM22 showed a notable decrease compared to the control treatment in the rearing water with log CFU/ml values of 4.517 (Control), 2.554 (TM1), 2.571 (TM7), 2.222 (TM22) and in the intestines of fish with log CFU/g values of 5.597 (Control), 3.828 (TM1), 3.806 (TM7), 3.648 (TM22). Streptomyces sp. TM1, TM7, and TM22 could decreased total Aeromonas count in the gut of discus fish and in the rearing water, and boost the growth performance of discus fish (Symphysodon sp.).
Optimization of Piperine Extraction Process from Vietnamese White Pepper
Authors: Le Xuan-Tien , Nguyen Ngoc-Thanh , Nguyen-Thi Bich-Tuyen , Dang Minh-Khanh , Ngo-Thi Thanh-Ngan , Vu Duc-Phuong , Duong-Nguyen Hong-Nhung , Pham-Vu Minh-Chau 
Published: May 2024

Abstract
The primary theme of this research was to consider and examine the piperine extraction process conditions from white pepper Piper nigrum L. The extraction method was carried out using a solvent cyclic extraction system with the same operating principle as the industrial apparatus and widely used in actual production. First, the one-factor-at-a-time method was used to determine the effects of the parameters on each process. The extraction conditions such as the ethanol concentration (90% v/v), solvent/solid ratio (3:1 mL/g), 3 times extraction per batch, each time at 70 °C for 60 minutes were found. The expected value of piperine yield from white pepper was 38.7 mg piperine/g of dry material and piperine content in oleoresin was 519.2 mg piperine/g of oleoresin. However, this method did not include the interaction effects between the research variables, which has not fully described the impact of the parameter for the response. Therefore, the study has successfully built a process for extracting oleoresin by Response Surface Methodolody (RSM) based on optimal conditions for 3 factors: ethanol concentration (85% v/v); solvent/solid ratio (3.4:1 mL/g), and extraction time (78 minutes). The results showed that the piperine extraction efficiency had a significant improvement (51.99%) compared with the variable-by-variable method (38.7%). This study proved the potential application of white pepper for the purpose of extracting active ingredients and economic. In other words, the entire skull of this pepper, which contained an abundant amount of piperine, was utilized to the maximum without wasting any leftover material after the extraction process.
Investigation of biological activities of essential oil obtained from peel of wild orange in Quang Ngai by steam distillation
Authors: Phan-Nguyen Quynh-Anh , Tran-Le Thien-Thu , Nguyen Huy-Hoang , Le Vu-Ha 
Published: May 2024

Abstract
Wild orange abundantly and naturally occuring in mountainous regions of Western Quang Ngai (Vietnam) has been commonly collected and consumed as a unique fruit with a low economic value. In this study, to propose the healthy benefits from this wild fruit, steam distillation was applied to extract essential oil from its peel with an extraction efficiency of approx. 3.85 wt.%. Gas chromatography-mass spectrometry (GC-MS) was employed to evaluate the chemical makeup of the essential oil obtained, in which, D-limonene (78.4%) and β-myrcene (2.4%) were found to be the most significant among 44 detected compounds. The in vitro antifungal activity of the essential oil against Candida Albicans (C.albicans) and Malassezia Furfur (M.furfur) was discovered using the zone-of-inhibition (ZOI) method. The experimental result showed that the inhibition to C.albicans was significant at a high concentration of the essential oil while the inhibition to M.furfur was better even at a low concentration (2.5 mg/mL) with an inhibitory ring diameter of 27 ± 0.3 mm, proving the great potential of this essential oil towards pharmaceutical and biological applications.
A Study on Synthesis of para-menthane-3,8-diol (PMD) - A Safe Mosquito Repellent Active Ingredient
Authors: LE Xuan-Tien , VU Duc-Phuong , NGUYEN Dinh-Khai , Ngoc NGUYEN Thanh , TONG Thanh- Danh 
Published: May 2024

Abstract
Active ingredient para-menthane-3,8-diol (PMD) is evaluated as effective in repelling insects in general and is recommended by the Centers for Disease Control and Prevention as an insect repellent, especially against mosquitoes worldwide. The present study attempted to evaluate the suitable conditions for the synthesis of PMD from two sources of materials that are pure (±)-citronellal (∼ 96%) and lemon eucalyptus (Eucalyptus citriodora) essential oil (∼ 60% citronellal) by treatment of sulfuric acid in a biphasic medium (H2O/essential oil). The one-factor-at-a-time method was used to determine the optimal conditions for the synthesis of PMD from pure (±)-citronellal. The effect of various factors such as oil-to-water ratio (citronellal to sulfuric acid aqueous solution), acid concentration (sulfuric acid), reaction temperature, and reaction time on the PMD yield and conversion of citronellal was investigated. The highest PMD yield (95.6%) with excellent conversion of citronellal (98.5%) was obtained at optimal conditions such as, oil to water ratio of 1:2, acid concentration of 0.75% (w/w), reaction temperature of 60°C, and reaction time of 6 h. These optimal conditions were applied to synthesize PMD from Eucalyptus citriodora essential oil. From 200 grams of essential oil and applied optimal conditions, PMD was obtained with a yield of 91.5%.
Effects of varieties, pre-treatment and ultrasound assisted extraction on yields and characteristics of essential oils from young pomelo (Citrus Grandis L.) peels
Authors: Bui Vu Anh , Nguyen Thuong Hoai , Phan Hoa Ngoc , Chau Ai Tran Diem 
Published: May 2024

Abstract
Essential oils were extracted from two Vietnam local varieties of pomelo namely Citrus Grandis L. CV Nam Roi and Citrus Grandis L. CV Da Xanh. Storage methods by freezing or drying of young fruit peels affect the yield of extracted essential oils. The yield of essential oils obtained from Da Xanh variety was higher in Nam Roi variety. The extraction under ultrasound assisted condition increased the yield by two folds. The composition of volatile compounds in pomelo essential oils varied with different pomelo varieties and storage methods of the materials. The dominant compound in young peels essential oils Nam Roi, Da Xanh is limonene (55 – 90%). Nam Roi peels essential oils have antioxidant and antimicrobial activities (inhibition ability against Bacillus subtilis and Staphylococcus aureus) higher than Da Xanh peels’ essential oils.
New 4D hyperchaotic system’s application in image encryption
Authors: Xu Heming , Wang Jian 
Published: May 2024

Abstract
In order to protect sensitive information from unauthorized access and illegal copy during network transmission, storage and processing, we propose a new four-dimensional hyperchaotic system (4DHS) and apply it to encryption algorithm. Firstly, the dynamical properties of 4DHS are analyzed according to the structure, and the chaotic properties are verified by dissipation, equilibrium point and lyapunov exponent. Secondly, the chaotic sequence combined with Arnold scrambling method is adopted to scramble the pixel values of the plaintext image, and the scrambled pixel matrix is diffused into the ciphertext image matrix by XOR operation. Finally, we conduct the experiments to validate the effectiveness of the proposed encryption algorithm and achieve satisfactory results. At the same time, we compare the proposed encryption algorithm with other encryption algorithms, and the excellent encryption effect of our encryption algorithm can be proved.
Coexistence of varied intensities, phases, and polarization states along the direction of beam propagation
Authors: Yang Jianhe , Tao Shaohua 
Published: May 2024

Abstract
Polarization state, as one of the fundamental properties of light fields, has found widespread applications across various domains. The control of intensity, phase, and polarization state along the direction of beam propagation has opened up new avenues for beams. In this work, we generated a beam in which different intensities, phases, and polarization states can simultaneously appear at different positions along the direction of beam propagation. In other words, varied intensities, phases, and polarization states can coexist in the direction of beam propagation. The correctness of this method is validated through theoretical analysis and experimental results. This approach expands the application scope of light beams and provides a favorable path for exploring the optical characteristics of beams.
Yellow light privacy protection with anti-reflection structure based on photonic band gap principle
Authors: Pei Na , Wan Bao-Fei , Xie Sun-Xin , Zhang Ting-Hao , Zhang Hai-Feng 
Published: May 2024

Abstract
This paper delves into the one-dimensional photonic crystals (PCs) privacy protection structure (PPS), emphasizing a layered structure with polarization-independent angular response characteristics tailored to meet the need for PPS in various situations. Introducing a specialized design for photonic band gap (PBG), the PPS adheres to the principles of PBG. This design comprises a host structure and an anti-reflection structure carefully selected within the yellow light band (frequency range spans from 530 THz to 510 THz). The given PPS creates an angle selection (AS) window exhibiting transmittance consistently above 0.85 within −29° to 29° while ensuring transmittance drops to 0.1 within the −90° to −46° and 46°–90° range. This arrangement effectively achieves the desired PPS. The effects of the host structure on the four key parameters of refractive index and thickness of the two media on PPS properties were studied in detail. The influence of these parameters mainly involves the transmittance of the visible area, the AS, and the transmittance of the protected area.