bluuebunny/crossref_metadata_2025_split huggingface dataset:
Business cycle synchronization and sustainable trade development in Africa: The role of capital mobility
Authors: Abendin Simon , Naatu Felicia , Khan Salim , Nkukpornu Etse , Yuan Hongping 
Published: March 2024

AbstractThe literature has overlooked the significance of business cycle synchronization in sustainable trade development, particularly with regard to trade‐adjusted carbon emissions. Further, how capital mobility affect the nexus between business cycle synchronization and sustainable trade development is an area that is yet to be explored. This paper examines the role of capital mobility in the nexus between business cycle synchronization and sustainable trade development using the panel corrected standard errors model in 30 African economies for the period 2006–2020, thus addressing the gaps in the previous studies. We concluded that: First, the direct effects of business cycle synchronization worsen sustainable trade development in Africa. Second, capital mobility promotes sustainable trade development in Africa. Third, capital mobility may be a viable instrument to mitigating the detrimental effects of synchronized business cycles on the sustainable trade development in Africa. Fourth, our research contributes to the extant literature by determining the threshold at which capital mobility can affect the association between synchronized business cycles and sustainable trade growth. Fifth, our study revealed that business cycle synchronization and capital mobility have a causal relationship with sustainable trade development in Africa. The concluding remarks section includes policy implications.
Phase‐Tunable Molybdenum Boride Ceramics as an Emerging Sensitive and Reliable SERS Platform in Harsh Environments
Authors: Hu Mengen , Li Ke , Dang Xian , Yang Chengwan , Li Xinyang , Wang Zhen , Li Kewei , Cao Liang , Hu Xiaoye , Li Yue , Wu Nianqiang , Huang Zhulin , Meng Guowen 
Published: March 2024

AbstractTraditional surface‐enhanced Raman scattering (SERS) sensors rely heavily on the use of plasmonic noble metals, which have limitations due to their high cost and lack of physical and chemical stability. Hence, it is imperative to explore new materials as SERS platforms that can withstand high temperatures and harsh conditions. In this study, the SERS effect of molybdenum boride ceramic powders is presented with an enhancement factor of 5 orders, which is comparable to conventional noble metal substrates. The molybdenum boride powders synthesized through liquid‐phase precursor and carbothermal reduction have β‐MoB, MoB2, and Mo2B5 phases. Among these phases, β‐MoB demonstrates the most significant SERS activity, with a detection limit for rhodamine 6G (R6G) molecules of 10−9 m. The impressive SERS enhancement can be attributed to strong molecule interactions and prominent charge interactions between R6G and the various phases of molybdenum boride, as supported by theoretical calculations. Additionally, Raman measurements show that the SERS activity remains intact after exposure to high temperature, strong acids, and alkalis. This research introduces a novel molybdenum boride all‐ceramic SERS platform capable of functioning in harsh conditions, thereby showing the promising of boride ultrahigh‐temperature ceramics for detection applications in extreme environments.
Uniting Synergistic Effect of Single‐Ni Site and Electric Field of B‐ Bridged‐N for Boosted Electrocatalytic Nitrate Reduction to Ammonia
Authors: Ajmal Saira , Kumar Anuj , Mushtaq Muhammad Asim , Tabish Mohammad , Zhao Yulin , Zhang Wenbin , Khan Abdul Sammed , Saad Ali , Yasin Ghulam , Zhao Wei 
Published: March 2024

AbstractElectrochemical conversion of nitrate, a prevalent water pollutant, to ammonia (NH3) is a delocalized and green path for NH3 production. Despite the existence of different nitrate reduction pathways, selectively directing the reaction pathway on the road to NH3 is now hindered by the absence of efficient catalysts. Single‐atom catalysts (SACs) are extensively investigated in a wide range of catalytic processes. However, their application in electrocatalytic nitrate reduction reaction (NO3−RR) to NH3 is infrequent, mostly due to their pronounced inclination toward hydrogen evolution reaction (HER). Here, Ni single atoms on the electrochemically active carrier boron, nitrogen doped‐graphene (BNG) matrix to modulate the atomic coordination structure through a boron‐spanning strategy to enhance the performance of NO3−RR is designed. Density functional theory (DFT) study proposes that BNG supports with ionic characteristics, offer a surplus electric field effect as compared to N‐doped graphene, which can ease the nitrate adsorption. Consistent with the theoretical studies, the as‐obtained NiSA@BNG shows higher catalytic activity with a maximal NH3 yield rate of 168 µg h−1 cm−2 along with Faradaic efficiency of 95% and promising electrochemical stability. This study reveals novel ways to rationally fabricate SACs' atomic coordination structure with tunable electronic properties to enhance electrocatalytic performance.
ReInstancer: An automatic refactoring approach for Instanceof pattern matching
Authors: Zhang Yang , Hong Shuai 
Published: March 2024

AbstractThe instanceof pattern matching can improve the code quality and readability by removing the redundant typecasting and simplifying the design in different scenarios. However, existing works do not provide sufficient support for refactoring instanceof pattern matching. This paper first identifies several cases that cannot be well handled by existing IDEs. Based on these observations, we propose a novel approach called ReInstancer to refactor instanceof pattern matching automatically. ReInstancer conducts program analysis for multi‐branch statements to obtain pattern variables. After analyzing these patterns, the multi‐branch statements are optimized and finally refactored into switch statements or expressions. ReInstancer is evaluated by 20 real‐world projects with more than 7,700 instanceof pattern matching. The experimental results demonstrate that a total of 3,558 instanceof expressions and 228 multi‐branch statements are refactored within 10.8 s on average for each project. ReInstancer improves the code quality by reducing redundant typecasting, demonstrating its effectiveness.
Nozzle‐Free Printing of CNT Electronics Using Laser‐Generated Focused Ultrasound
Authors: Seva Sarah , Rorem Benjamin , Chinnathambi Karthik , Estrada David , Guo L. Jay , Subbaraman Harish 
Published: March 2024

AbstractPrinted electronics have made remarkable progress in recent years and inkjet printing (IJP) has emerged as one of the leading methods for fabricating printed electronic devices. However, challenges such as nozzle clogging, and strict ink formulation constraints have limited their widespread use. To address this issue, a novel nozzle‐free printing technology is explored, which is enabled by laser‐generated focused ultrasound, as a potential alternative printing modality called Shock‐wave Jet Printing (SJP). Specifically, the performance of SJP‐printed and IJP‐printed bottom‐gated carbon nanotube (CNT) thin film transistors (TFTs) is compared. While IJP required ten print passes to achieve fully functional devices with channel dimensions ranging from tens to hundreds of micrometers, SJP achieved comparable performance with just a single pass. For optimized devices, SJP demonstrated six times higher maximum mobility than IJP‐printed devices. Furthermore, the advantages of nozzle‐free printing are evident, as SJP successfully printed stored and unsonicated inks, delivering moderate electrical performance, whereas IJP suffered from nozzle clogging due to CNT agglomeration. Moreover, SJP can print significantly longer CNTs, spanning the entire range of tube lengths of commercially available CNT ink. The findings from this study contribute to the advancement of nanomaterial printing, ink formulation, and the development of cost‐effective printable electronics.
Advances in Injectable Hydrogels Based on Diverse Gelation Methods for Biomedical Imaging
Authors: Mo Chunxiang , Zhang Weiyao , Zhu Kang , Du Yang , Huang Wei , Wu Ying , Song Jibin 
Published: March 2024

AbstractThe injectable hydrogels can deliver the loads directly to the predetermined sites and form reservoirs to increase the enrichment and retention of the loads in the target areas. The preparation and injection of injectable hydrogels involve the sol–gel transformation of hydrogels, which is affected by factors such as temperature, ions, enzymes, light, mechanics (self‐healing property), and pH. However, tracing the injection, degradation, and drug release from hydrogels based on different ways of gelation is a major concern. To solve this problem, contrast agents are introduced into injectable hydrogels, enabling the hydrogels to be imaged under techniques such as fluorescence imaging, photoacoustic imaging, magnetic resonance imaging, and radionuclide imaging. This review details methods for causing the gelation of imageable hydrogels; discusses the application of injectable hydrogels containing contrast agents in various imaging techniques, and finally explores the potential and challenges of imageable hydrogels based on different modes of gelation.
Visualisation and outlier detection for probability density function ensembles
Authors: Murph Alexander C. , Strait Justin D. , Moran Kelly R. , Hyman Jeffrey D. , Stauffer Philip H. 
Published: March 2024

AbstractExploratory data analysis (EDA) for functional data—data objects where observations are entire functions—is a difficult problem that has seen significant attention in recent literature. This surge in interest is motivated by the ubiquitous nature of functional data, which are prevalent in applications across fields such as meteorology, biology, medicine and engineering. Empirical probability density functions (PDFs) can be viewed as constrained functional data objects that must integrate to one and be nonnegative. They show up in contexts such as yearly income distributions, zooplankton size structure in oceanography and in connectivity patterns in the brain, among others. While PDF data are certainly common in modern research, little attention has been given to EDA specifically for PDFs. In this paper, we extend several methods for EDA on functional data for PDFs and compare them on simulated data that exhibit different types of variation, designed to mimic that seen in real‐world applications. We then use our new methods to perform EDA on the breakthrough curves observed in gas transport simulations for underground fracture networks.
Cycloartane triterpenoids and biological activities from the propolis of the stingless bee Lisotrigona furva
Authors: Thanh Le Nguyen , Thoa Ha Thi , Oanh Nguyen Thi Tu , Giap Tran Huu , Quyen Vu Thi , Ha Nguyen Thi Thu , Phuong Diep Thi Lan , Lien Nguyen Thi Phuong , Hang Nguyen Thi Minh 
Published: March 2024

AbstractChromatographic separation of ethyl acetate extract of the stingless bee Lisotrigona furva propolis, that collected in Khanh Hoa province, led to isolation of five cycloartane‐type triterpenes including cycloartenone (1), cycloartenol (2), (24E)‐3β‐hydroxycycloart‐24‐en‐26‐al (3), mangiferonic acid (4) and mangiferolic acid (5). Mango plant (Mangifera indica) was suggested to be a resin source of the propolis. The propolis EtOH extract showed good antimicrobial activity on Gram (+) strain E. feacalis and fungus C. albicans. Among the isolated compounds, compound 3 displayed selective activity against three Gram (+) strains and C. albicans over Gram (‐) strains with all MIC values of 64 μg/mL. However, the propolis EtOH extract was not active against LU‐1 and MCF‐7 cancer cell lines. Only compound 5 exhibited moderate activity on LU‐1 cancer cell line with IC50 of 13.33 μg/mL.
Study of copper releasing rate from vinyl copolymer/Cu2O/Seanine 211‐based anti‐fouling paint coating
Authors: Thanh Do Minh , Hiep Nguyen Anh , Sang Vu Dinh 
Published: March 2024

AbstractThe effects of Seanine 211 content rate on Cu releasing as well as coating properties were investigated. The process of releasing Cu has been studied in dynamic conditions with Seanine content of 0, 3, 5, 10 % and static conditions using Seanine content of 5 % (in weight). Under dynamic conditions, the Cu shall release at high speed in the first 2 days of the test, then remain stable and proportional to the time according to the linear‐line equation, maintained at ≈ 3.5 μg/cm2/day. Under static conditions, the process of Cu releasing is studied through the reduction of coating thickness, the results show that the coating abrasion rate is also proportional to the time and according to linear‐line equation. With the content of 20 % Cu2O (in proportion) and 5 % Seanine (in proportion), the coat has the following properties: relative hardness 0.5; impact resistance 65 Kg.cm; flexural strength 1 mm; adhesion cross cut at 1.
Electrochemical deposition of gold nanoparticles‐based plasmonic catalyst for glucose oxidation
Authors: Van Quynh Nguyen , Minh Nguyen Binh , Thanh Dinh Thi Mai , Lam Nguyen Luong , Anh Nguyen Tien 
Published: March 2024

AbstractThis work describes an effective electrodeposition method for generating gold plasmonic electrodes which are further used for detecting glucose in solution without the presence of any enzymes (i.e Gox). Under light irradiation, the electro‐catalytic oxidation of glucose on the electrodeposited gold nanoparticle (AuNP) surfaces has been investigated. The wavelength‐dependent electrochemical oxidative current intensity implies that the hot carriers transferred from the excited plasmonic AuNPs to the absorbed molecules are responsible for enhancing electro‐catalysis performance. Hot holes can particularly contribute to the oxidation reaction of glucose on the plasmonic surfaces without the presence of any enzymes in solution. Furthermore, the presence of nano‐sized gold particles exhibits a larger active surface area, which leads to a significant improvement in recorded oxidative current for the oxidation of glucose. These results reveal a promising manner for generating non‐enzymatic glucose electrochemical sensor upon plasmonic excitation.
Recent progress in the development of new artificial metalloenzymes as biocatalysts for selective oxidations and Diels‐Alder reaction ‐ Mini‐Review
Authors: Avenier Fréderic , Ghattas Wadih , Ricoux Rémy , Mahy Jean‐Pierre 
Published: March 2024

AbstractOur recent research is turning towards the elaboration of artificial metalloenzymes that catalyze reactions of interest for organic chemistry under eco‐compatible conditions. First, totally artificial metalloenzymes that catalyze selective oxidations in water are described following three main lines: (i) Insertion of microperoxidase 8 into Metal Organic Frameworks leading to artificial metalloenzymes as new biocatalysts for the selective sulfoxydation of sulfides and oxidation of dyes and by H2O2; (ii) Design of a new polyimine polymer‐based artificial reductase that allows the reductive activation of dioxygen and its use as an oxygen atom source for selective oxidations catalyzed by metal complexes including metalloporphyrins, copper complexes or Polyoxometalates and, (iii) Design of new artificial metalloenzymes that catalyze the photoreduction of H2O in the presence of photoactivable ruthenium complexes and the concommitant oxidation of sulfides. Second, the synthesis of new stereoselective Diels‐Alderases is described following three strategies: (i) Covalent insertion of metal complexes into thermostable artificial proteins issued from a new family of alpha‐helical repeated motifs (αReps), (ii) Substitution of the native Fe ion of a cupin‐like protein, ACCO oxidase, by a copper(II) ion and (iii) Insertion of a copper(II) complex‐antagonist conjugate into an adenosine receptor located at the surface of living HEK cells.
Attenuated total reflection‐Fourier transform infrared spectroscopy (ATR‐FTIR) for quantification of piroxicam in tablet dosage from as a green analytical method
Authors: Thang Nguyen Quoc , Tho Nguyen Thi Mai , Nga Ho Ngoc , Phuong Nguyen Thi Kim 
Published: March 2024

AbstractA simple, rapid, precise, accurate, reproducible, economic and eco‐friendly analytical method for the quantification of piroxicam in tablet dosage form, using attenuated total reflectance Fourier transform infrared spectroscopy (ATR‐FTIR), has been developed. The measurements were based on the ATR technique, wherein there is no sample preparation, except for pulverizing the tablet, thereby eliminating the use of toxic chemicals or solvents. The calibration curve of piroxicam was obtained by performing a linear regression analysis, using data from the direct ATR‐FTIR measurement of percentage transmittance (%T), corresponding to the secondary peak at 1526.38 cm‐1 in the concentration (C) range of 25.18‐93.63 mg/g. The linear regression equation obtained from the present data was represented by %T = ‐0.2178 C + 99.208 and was associated with a coefficient of determination (r2) of 0.998. The proposed method was validated for piroxicam in tablet form. The relative standard deviation percentage (%RSD) was found to be less than five, with a recovery percentage in the range of 96.0‐99.3 %.
Physico‐chemical characterization of forest and agricultural residues for energy conversion processes
Authors: Nam Nguyen Hong , Linh Vu Ngoc , Dung Le Duc , Ha Vu Thi Thu 
Published: March 2024

AbstractAgricultural and forest residues could become potential sources of energy in various countries. However, incomplete understanding regarding physico‐chemical properties of these residues presents the main challenges for energy conversion processes. This study presented a complete and comprehensive database of characteristics and compositions of a wide range of agricultural and forest residues. Physical characteristics (moisture, bulk density, calorific value, volatile matter, fixed‐carbon content, and ash content), elemental compositions (C, H, N, O, and S), as well as lignocellulosic compositions (cellulose, hemicellulose, and lignin) of ten biomass residues were analyzed. The major impacts of the variability in biomass compositions to biochemical and thermochemical processes were also discussed.
Characteristics of hydroxyapatite coating on Ti‐6Al‐4V substrate fabricated via sequent H2O2‐oxidizing and RF‐sputtering processes
Authors: Linh Nguyen Thi Truc , Tuan Phan Dinh 
Published: March 2024

AbstractIn this study, we created a hydroxyapatite (HAp) coating layer on top of the Ti‐6Al‐4V substrate via sequent H2O2‐oxidizing and RF‐sputtering processes and determining the effect of H2O2‐oxidizing state to the adhesion between HAp coating layer and Ti‐6Al‐4V substrate. The results showed that the H2O2‐oxidized Ti‐6Al‐4V surface is rough and porous, which increases the adhesion strength of the HAp coating layer on the alloy substrate. The shear strength value of the HAp/H2O2‐oxidized Ti‐6Al‐4V substrate was 69.3 MPa, significantly higher than that of the HAp/original Ti‐6Al‐4V substrate (12.9 MPa). The X‐ray photoelectron spectroscopy (XPS) proved the denser HAp coating layer covered the TiO2/Ti‐6Al‐4V substrate, consequently effectively prevented releasing of the unwanted toxic elements from the metallic implant.
Five phenolic compounds from Marchantia polymorpha L. and their in vitro antibacterial, antioxidant and cytotoxic activities
Authors: Son Nguyen Cong Thai , Tan Tran Quoc , Lien Do Thi My , Huong Nguyen Thi My , Tuyen Pham Nguyen Kim , Phung Nguyen Kim Phi , Phuong Quach Ngo Diem , Thu Nguyen Thi Hoai 
Published: March 2024

AbstractLunularin (1), marchantin A (2), isoriccardin C (3), luteolin (4) and apigenin (5) were isolated from the ethyl acetate extract of Marchantia polymorpha collected at Lam Dong province, Vietnam. The chemical structures of these compounds were elucidated by HR‐MS and NMR spectroscopic analysis as well as compared with data in the literature. The evaluation of the cytotoxic activity against MCF‐7, Hep G2, NCI‐H460, and HeLa cancer cell lines of the ethyl acetate extract and compounds (1) and (3) showed that (1) was potent against MCF‐7 cancer cell with the IC50 value of 4.59±0.38 μg/mL. The evaluation of DPPH radical scavenging activity displayed strong activities of the ethyl acetate extract, compounds (1) and (3) with SC50 of 12.75±13.27, 3.99±0.47 and 12.81±0.43 μg/mL, respectively, while SC50 of the positive control Trolox was 7.34±0.87 μg/mL. The antibacterial evaluation on the ethyl acetate extract and two compounds (2) and (3) against Staphylococcus epidermidis showed that (3) possessed remarkably antibacterial activity with the inhibition zone of 12.67 mm at a concentration of 50 μg/well.
Synthesis, characterization and biological activity of mixed ligand chelates of Ni(II) with pyridoxalthiosemicarbazone and dipeptides
Authors: Saritha A , Reddy Ch Venkata Ramana , Sireesha B 
Published: March 2024

AbstractThe synthesis, characterization of mixed ligand chelates of Ni(II), [NiAL] involving Pyridoxalthiosemicarbazone (A) and dipeptides (L) viz., glycyl‐glycine (gly‐gly), glycyl‐L‐leucine (gly‐leu), glycyl‐L‐tyrosine (gly‐tyr) and glycyl‐L‐valine (gly‐val) and their biological activities have been studied. The complexes were characterized based on their elemental analysis, LC‐MS, IR, UV‐Vis spectral studies, magnetic moment, molar conductance and thermal analysis. The mixed ligand complexes were formed with 1:1:1 (Ni:A:L) ratio. The molar conductance data reveal the non‐electrolytic nature of the metal chelates. IR spectra show that the ligands are coordinated to the metal ion in a tridentate manner, involving O,N,S and O,N,N donor sites of ligands, A and L respectively. Based on the analytical data, octahedral geometry has been proposed for the metal complexes. DNA binding properties of the complexes have been investigated by UV‐Vis and fluorescence spectroscopy and also by viscosity measurements. The obtained results indicate that the complexes bind to DNA through intercalation mode, which is further validated by molecular docking studies. The hydrolytic cleavage of the pBR322 DNA from supercoiled to nicked form, by the metal complexes was investigated by gel electrophoresis technique. The metal complexes were also screened for their antioxidant, anti‐inflammatory and antibacterial activities and the findings have been reported.
Adsorption of Ag+ ions using hydroxyapatite powder and recovery silver by electrodeposition
Authors: Nam Pham Thi , Thanh Dinh Thi Mai , Phuong Nguyen Thu , Trang Nguyen Thi Thu , Hong Cao Thi , Anh Vo Thi Kieu , Lam Tran Dai , Thom Nguyen Thi 
Published: March 2024

AbstractNowadays, waste of electrical and electronic apparatuses generated in huge amount surround the earth and has become a global environmental issue. Electronic waste contains large amounts of metal ions, such as Au, Ag, Cu, Pd, Pb and Cd etc., resulting in a threat to the environment, ecosystems and human health. Therefore, removal of metal ions and recovery of precious metals are extremely necessary. Hydroxyapatite material was reported that they can remove heavy metal ions in water with high efficiency. In this work, Ag+ ions in water were adsorbed using hydroxyapatite (HAp) powder and recovery silver by electrodeposition. The adsorption efficiency of silver was about 61 % at 50 oC after 60 minutes of contact time. The Ag+ adsorption process using HAp powder followed Langmuir adsorption isotherms with the maximum monolayer adsorption capacity of 18.7 mg/g. 60 % of silver can recovery by electrodeposition after 4 hours at the apply current of 10 mA at 50 °C.