bluuebunny/crossref_metadata_2025_split huggingface dataset:
A piezoelectric energy harvester with inner beam adapting to low and high wind speeds: modeling, simulation and experiment
Authors: Jia Jinda , Shan Xiaobiao , Xie Tao 
Published: March 2023

Abstract
Traditional vortex-induced vibration energy harvesters could transform wind or water energy into electricity at low flowing speeds. However, it has the disadvantage of narrow working speed band, which limits wide application in velocity-changing environments. A piezoelectric harvester with an inner beam for harvesting wind energy at both low and high wind speed regions is presented. A comprehensive nonlinear distributed fluid–solid–electric governing equations for vortex-induced vibration piezoelectric energy harvesting are derived and the theoretical results show that dimensions of outer beam and diameter of attached cylinder can affect optimal wind speed and maximum power output at both low and high wind speeds. In contrast, the dimensions of the inner beam and mass block only have impacts at high wind speeds. The equivalent circuit modeling method is utilized to analyze energy harvesting output characteristics. Analogies between mechanical and electrical domains are built, and the governing equations are converted to circuit equations. Then the circuit equations are settled in electrical software for time-varying analysis. The electrical circuit simulation results show that the optimal load resistance is 400 kΩ at low wind speed and 500 kΩ at low wind speed, which is consistent with theoretical results. The prototypes were fabricated and experiments were carried out in a wind tunnel. Experimental results indicate that energy harvester could generate power at both low and high speeds. Mass block has great impact on optical speed and working wind speed band. The energy harvester with 7.06 g mass block could output 127.36 μW at 2.65 m s−1 and 63.63 μW at 4.4 m s−1. Numerical and circuit simulation results are consistent with experimental results on optical load resistances and optical wind speeds. This design provides a feasible method for broadening wind speed region for energy harvesting.
Tunneling and entropy analysis of parameterized black hole with rotating case
Authors: Asgher Muhammad , Karamat Anosha , Babar Rimsha , Ali Riasat 
Published: March 2023

Abstract
In this work, we study the parameterized black hole solution by applying the Newman-Janis approach and also examine the Hawking temperature. We consider a Lagrangian field equation associated with the generalized uncertainty principle to study the motion of boson particles. By using semi-classical phenomenon, we analyze the modified Hawking temperature and graphically check the effects of deformation, rotation and correction parameter on black hole geometry. Furthermore, we investigate the logarithmic corrected entropy and also analyze the graphical behavior of deformation and quantum gravity parameter on the logarithmic corrected entropy of black hole.
To investigate the structural, electronic, optical and magnetic properties of Sr-doped KNbO3 for perovskite solar cell applications: A DFT study
Authors: Jameel Muhammad Hasnain , Rehman Azka , bin Roslan Muhammad Sufi , Agam Mohd Arif Bin 
Published: March 2023

Abstract
A First-principles research based on density functional theory is used to explore the various properties of pure and Sr-doped-KNbO3-perovskites compounds such as structural, electronic, magnetic, and optical characteristics. The Sr impact on structural, optical, electronic, and magnetic properties of Sr-doped-KNbO3 are investigated using ultra-soft pseudo-potential. The band gap of Sr-doped-KNbO3 is found to be remarkably increased from 1.50 eV to 1.83 eV after the doping of Strontium (Sr) with various percentages (0%, 12.5%, 25%, 37.5%). Under the DFT study, strontium(Sr) is appropriate material for increasing the band gap of KNbO3. Owing to the difference in ionic radii of Mo and Sr volume of crystal cells also decreased from 82.68 to 42.89 A3 after the doping of Strontium (Sr). The bandgap nature is found indirect furthermore bandgap showed that the material is a prominent semiconductor. A significant increment is obtained in the optical conductivity and also bandgap. After the doping of strontium (Sr) impurities, the energy absorption peaks are amplified. It is also observed that due to Sr substitution optical conductivity shifted toward higher energies. Sr-doped-KNbO3 has enhanced optical conductivity, energy absorption, and refractive index, making it an appropriate material for perovskite solar cell applications.
Light-induced switch based on edge modes in irradiated thin topological insulators
Authors: Askarpour Zahra , Cheraghchi Hosein 
Published: March 2023

Abstract
We investigate transport properties through the nano-ribbons of thin topological insulators irradiated by circularly polarized light in a high-frequency regime. It is demonstrated that pseudo-spin polarized edge modes appearing in the bulk band gap are responsible for the current flowing through this nano-junction whose localization on the top and bottom edges depend strongly on the polarization of light. Based on these edge modes, one can design a light-induced switch with a desirable on/off ratio of the current whose off-state is engineered by dividing the scattering region into two parts. Each part is irradiated by the light with opposite polarization in respect to the other one. This off-state arises from the quantum blocking of transition between two edge modes with opposite pseudo-spin polarization induced by irradiation. The local current on each bond shows how the current passes through the edges and jumps to the opposite edge. Furthermore, some other nano-junctions are proposed as a light-induced switch which are designed based on the gap opening induced by the perpendicular magnetization or structural inversion asymmetry.
Trap sensitivity of splitted source Z Shape horizontal pocket and hetero stack TFETs: a simulation study
Authors: Tiwari Shreyas , Saha Rajesh 
Published: March 2023

AbstractThis paper reports the trap sensitivity analysis of split source horizontal pocket Z shape tunnel field effect transistor (ZHP-TFET) and hetero stack TFET (HS-TFET) using technology computer aided design (TCAD) simulator. The sensitivity analysis elaborates the significance of ideal trap charges at the interface of oxide and semiconductor material for both acceptor and donor like traps. The trap sensitivity analysis is highlighted for variation in trap-concentrations, temperature, gate-metal work function, and peak energy position, for both the TFETs. Furthermore, we have implemented digital inverter on taking into account the interface trap charges effect. Result reveals that tarp sensitivity on various electrical parameter of HS-TFET is significantly higher than ZHP-TFET. It is seen that ZHP-TFET provides sensitivity around 11 and 33 under acceptor and donor impurities, respectively, whereas, for HS-TFET sensitivity is around 22 and 60 for acceptor and donor impurities, respectively, for wide variation in trap concentration. The voltage transfer characteristic and voltage gain of digital inverter are improved by observable amount in ZHP-TFET than HS-TFET for both donor and acceptor like trap. The noise margin of ZHP-TFET based resistive inverter comes 0.75 V, 0.73 V, and 0.77 V, while in case of HS-TFET these value noted as 0.32 V, 0.13 V and 0.37 V under consideration for no trap, acceptor trap, and donor trap, respectively.
The research of vasoconstriction effect on the solitary waves in stenotic arterial vessel
Authors: Sang Xue , Zhang Zongguo , Yang Hong-Wei , Fu Lei 
Published: March 2023

Abstract
Vascular stenosis is a common cardiovascular disease, and the in-depth study of its biomechanical mechanism will help to explore the occurrence mechanism and law of the disease, which is of great significance in the prevention and diagnosis of cardiovascular disease. Different from previous studies, radial and axial motions are considered in the realistic configuration of the wall, and the wall equation of the stenotic artery is established. On the basis of the wall equation and fluid equation, the KdV-Burgers equation is obtained by scale analysis and perturbation expansion. The effects of axial displacement and wall initial conditions on the propagation of solitary waves in stenotic arteries are discussed. It is shown that with the increase of the axial and radial tension ratios, the amplitude and width of the solitary wave increase, and the solitary wave becomes steeper and more sharp. The results of this study provide a theoretical value for detecting the shape change of solitary wave in blood vessel to predict vascular stenosis.
Surface stability and H adsorption and diffusion near surfaces of W borides: a first-principles study
Authors: Yang L. , Wirth B.D. 
Published: March 2023

Abstract
Understanding the behavior of tungsten boride (W
x
B
y
) surfaces in a fusion reactor environment is an important topic since boronization is a common wall conditioning method used in fusion Tokamaks. We report the results of density functional theory calculations that investigate the surface stability of W
x
B
y
(tetragonal I41/amd-WB, hexagonal P63/mmc-WB2 and tetragonal I4/m-W2B) with low-index orientations, as well as hydrogen (H) energetics near W
x
B
y
surfaces. For single element terminated W
x
B
y
surfaces, B terminated surfaces are more energetically stable than W terminated as a result of significant reconstruction of B. The H surface adsorption energy and activation energy of H diffusion penetration below W
x
B
y
surfaces are mainly related to the outer termination. Specifically, the WB(001) surface terminated with two B layers, referred to as WB(001)-TBB, has higher H adsorption affinity and lower H diffusivity on this surface than other terminations, which is controlled by the significant charge transfer from B to H. However, B atoms on the WB2(0001)-TBB surface decrease both H adsorption and diffusivity on the surface, but enhance H diffusion below the surface in comparison to W terminated WB2(0001) surface. H would be trapped and diffuse within atomic surface gaps on the WB2(

2

1
ˉ

1
ˉ

0

) surface, while H below the surface layer would jump along the [0001] direction rather than diffuse into bulk. The surface diffusion activation energy of H on the W2B(001) surface slightly varies with terminations. Once H crosses the surface layer of W2B(001) with either termination, it prefers to diffuse into the bulk, or back towards the surface, rather than move parallel to the surface. Interestingly, WB2(0001) and WB2(

2

1
ˉ

1
ˉ

0

) surfaces will have relatively higher H retention than the other W
x
B
y
surfaces evaluated in this work.
Penrose-like tilings from projection of affine A
4 to affine H
2
Authors: Koca Nazife O 
Published: March 2023

Abstract
The present work offers a different perspective for the 5-fold symmetric quasicrystallography by employing affine H
2 as a subgroup of affine A
4. It is shown that the projection of the Voronoi cell of the root lattice A
4 can be dissociated as identical five decagons up to a rotation tiled by thick and thin rhombuses. Projection of the Voronoi cell of the weight lattice onto the Coxeter plane tessellates the plane with four different tiles: thick and thin rhombuses with different edge lengths and two types of hexagons. Structure of the local dihedral symmetry H
2 fixing a particular point on the Coxeter plane is determined.
Multimagnon-mediated Raman scattering in two-dimensional quasiperiodic Heisenberg antiferromagnets
Authors: Yamamoto Shoji , Ohara Jun 
Published: March 2023

Abstract
We demonstrate configuration-interaction and Green’s function approaches to the Shastry-Shraiman fourth-order magnetic Raman response of Heisenberg antiferromagnets on the two-dimensional C5v Penrose and C8v Ammann-Beenker lattices. Beyond the Loudon-Fleury second-order perturbation scheme, two more symmetry species A1 and A2 become Raman-active to break the depolarized Loudon-Fleury Raman response of E2 symmetry. The A1 and A2 modes are activated by dynamic ring exchange and chiral spin fluctuations, respectively, the former of which owes much to multimagnon scatterings in a complicated manner, while the latter of which owes much to aperiodic arrangements of different rhombuses.
First-principles study of the initial stage of Pentacene adsorption on the twofold surface of the Ag-In-Yb quasicrystal
Authors: Sato M. , Hiroto T. , Matsushita Y. , Nozawa K. 
Published: March 2023

Abstract
The adsorption of the pentacene (Pn) molecule on the twofold surface of icosahedral (i)-Ag-In-Yb Quasicrystal (QC) have been studied by means of density functional theory (DFT) calculations. We calculate the adsorption energy of Pn at various positions with the molecular axis parallel to the surface and aligned along the fivefold or twofold symmetry axes directions. Pn is stabilised on a Yb trapezoid site from the acute rhombohedron units located between the rhombic triacontahedral clusters. The calculated adsorption energies for different molecular orientations can explain a recent experimental observation.
A new concept for carbon dioxide elimination from combustion plants flue gases
Authors: Panayotov V T , Panayotova M I 
Published: March 2023

Abstract
The production of energy from thermal power plants by burning fossil fuels is expected to remain a major part of the global energy mix for a significant period of time. The issue of pollutant emissions remains on the agenda, especially carbon dioxide (CO2) due to its large quantities released. The article proposes a new concept for the elimination of carbon dioxide and other gaseous pollutants from the waste gases of combustion plants. Based on the assessment of the thermodynamic feasibility of the processes, metals and alloys were selected and initial tests were performed for the transformation of model waste gases from thermal power plants into solid products that could be further utilized by hydrometallurgical technologies. Removals achieved at small scale laboratory experiments were >89 % CO2, > 71 % CO, > 96 % NOx and > 60 % SO2.
Development of the environmental market in Ukraine in the strategic perspective
Authors: Skorokhod I , Rodchenko V , Karlova O , Horbach L , Skorokhod D 
Published: March 2023

Abstract
The article reveals the features of organizational and economic support for the development of the environmental market in Ukraine. It shows the analysis of development of the environmentally friendly products market and services in Ukraine. Here we built a multiple-regression model of organic consumption in Ukraine, and the analysis is based on the following factors: the number of certified producers of organic products; the volume of consumption of organic products on the domestic market; the area of agricultural land allocated for organic production and the capacity of the organic market in Ukraine. It is proved that in order to intensify the organizational and economic support of the environmental market in Ukraine, it is necessary to determine the main socio-ecological and economic tools for creating a system of environmental goods production, including the adoption of new legislation; the implementation of the Ukraine-EU Association Agreement; informatization of the economy, formation of online services; the dissemination of environmental audit activities; the environmental insurance services in the agro-industrial complex; the digitalization of production cycles from production, logistics to preservation of quality and terms of realization and delivery of ecological production. We offered a number of strategic directions for ecological market development in Ukraine.
Approaches for assessing the public administration activities in the field of ensuring sustainability
Authors: Strelcow W , Padafet Iu , Ulyanchenko Yu 
Published: March 2023

Abstract
Paper has tried to find a balance between the traditional role of public administration (transparency, efficiency, information symmetry and other values of common European administrative space) and the new role since the European Green Deal (2020) and public procurement reform (2014) as a policy tool for promoting green growth. It has been argued that Green Public Governance Efficiency can be assessed according to inputs and outputs. The information can be organised into several categories: Investment in Environmental governance, public institution energy consumption and green public procurement. Some variables can be waged as outputs: sustainable development growth index (SDGI), consumer engagement in green governance and the achievement of Green Public Procurement (GPP) criteria. It is difficult to arrive at conclusions about a need for appropriate instrumental variables. Despite the limitations, these are valuable in light of how Public Administration can contribute to environmental protection and long-term growth.
Determination of the competitiveness of cities and districts of the Odessa region
Authors: Azhaman I , Petryshchenko N , Oklander T , Pandas A 
Published: March 2023

Abstract
The development of regions, their features and the possibility of a balanced growth of the economy of the regions are relevant for all countries. The ability to evenly and steadily develop the region and use the available resources is the basis of any management strategy. The choice of management model in the development of the region is influenced by a number of factors, among which are the limited resources, the level of development of the region and its general condition, scientific and technological progress, labor resources, transport links and other factors. The purpose of the study is to identify the most progressive and promising for investment areas of the Odessa region and depressive ones, which will allow implementing the region’s development strategy more efficiently and taking into account the needs of depressed regions.
Formulating silver nanoparticles from Syzygium Samagense flower buds extract
Authors: Nguyen Trong Q , Doan Trinh N D , Hong Quy L , Do Tri M , Nguyen Nguyen H 
Published: March 2023

Abstract
The study was to investigate the possibility of synthesizing silver nanoparticles by chemical reduction method using Syzygium Samagense flower bud extract as a green reducing agent. Various reaction conditions affecting the synthesis of silver nanoparticles were investigated including AgNO3 concentration (2 mM; 5 mM; 10 mM), volume ratio Vextract/VAgNO3 (2:30; 3:30; 4:30; 5:30), reaction temperature (50 – 80 °C), reaction time (15 - 60 mins). The presence of silver nanoparticles was detected by the combination of spectroscopy and X-ray diffraction (XRD) technology while the size of silver nanoparticles was determined by scanning electron microscopy (FE-SEM). The results showed that silver nanoparticles (owning an average size in the range of 20 - 35 nm) were successfully formulated with the highest yield when mixing the flower bud extract and AgNO3 solution (5 mM) with a ratio of 4:30 at 70 °C for 45 mins.
Nematode Community as a Tool to Monitor Ecosystem Health of Kembangkuning Mangrove Forest, Indonesia
Authors: Maharning A R , Ardli E R , Prabowo R E 
Published: March 2023

Abstract
Previous studies show that nematode community structure is an efficient bio-tool to detect environmental changes and pollution impacts. Despite their presence and function in an ecosystem, the nematode community is never used to monitor the Kembangkuning mangrove, Segara Anakan. Thus, we intended to collect nematode functional trait data as a baseline to monitor the mangrove ecosystem health. The mangrove is a naturally growing forest dominated by Rhizophora apiculata and Aegiceras corniculatum, surrounded by settlements and industries. We extracted nematodes from mangrove sediment using the Baermann funnel method. The nematode functional traits were recorded as the baseline data for monitoring purposes. To further examine the nematode community variations, we correlated the nematode functional traits and composition to specific environmental variables. Canonical correspondence analysis revealed a 25.32% accumulated variance with four prominent variables associated with the trait distribution (potassium r = 0.56, water content r = -0.56, salinity r = 0.75, organic carbon r = 0.68). Comparison with published data indicates that the three most abundant nematodes, the non-selective deposit and epistrate feeders of our study site, are also observed in anthropogenically disturbed areas. This finding suggests that our study site requires continual health monitoring to maintain a relatively healthy forest ecosystem.
Microencapsulation of agarwood (Aquilaria crassna) essential oil by spray drying
Authors: Thao Vy Truong , Truong Vinh 
Published: March 2023

Abstract
Agarwood essential oil is the essential oil extracted from the heartwood of agarwood trees (Aquilaria sp.) after inoculation or natural infection of one of several fungal species. The essential oil is proved to carry antioxidant, antimicrobial and anti-stress activities. Microencapsulation of essential oil included emulsification of oil into maltodextrin solution and spray drying of emulsion at different levels of inlet temperature and compressed air pressure. Microencapsulation process was qualified based on following parameters including process’s microencapsulation yield, moisture content of powder, powder particle size, encapsulated oil’s composition, oil recovery and drying yield. Microencapsulation yield was affected by inlet temperature whereas drying yield changed as air pressure varied from 1.5 to 2.5 kgf/cm2. Other parameters were impacted by both variables. Besides, oil composition changed at an acceptable degree after microencapsulation process, in which there were an increase in percentage and the presence of some components but the main components still remained in the encapsulated oil. Finally, the drying air temperature of 150 °C and air pressure of 2.5 kgf/cm2 were the best parameters to obtain both microencapsulation yield of 89.12% and drying yield of 79.00%.
Structural, optical properties and photocatalytic activity of spin-coated CuO thin films
Authors: Komaraiah Durgam , Sayanna Rodda 
Published: March 2023

Abstract
The semiconductor metal oxide CuO films have been fabricated using spin coating techniques. The prepared CuO thin films were annealed at different temperatures and characterized by an x-ray diffractometer, scanning electron microscope (SEM), energy-dispersive x-ray spectroscopy (EDS), FTIR, UV–vis, and fluorescence spectrometer. X-Ray diffraction (XRD) patterns revealed the polycrystalline nature of CuO with the monoclinic crystal structure. SEM analysis of CuO films endorsed the particle-like spherical shape structure. The CuO thin films have shown high optical absorption with a narrow bandgap. The band gap values were evaluated from Tauc’s plots and these values were found to be in the range of 1.63 to 1.72 eV. At an excitation of 325 nm, the CuO films display characteristic photoluminescence (PL) emission in the UV and visible regions. Furthermore, the CuO thin films show enhanced photocatalytic performance towards the degradation of organic dyes under visible light.