bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on electronic synaptic simulation of HfO2-based memristor by embedding Al2O3
Authors: Lin Jinfu , Liu Hongxia , Wang Shulong 
Published: September 2023

Abstract
The potential of neuromorphic computing in synaptic simulation has led to a renewed interest in memristor. However, the demand for multilevel resistive switching with high reliability and low power consumption is still a great resistance in this application. In this work, the electronic synaptic plasticity and simulated bipolar switching behavior of Pt/Al2O3(2 nm)/HfO2 (10 nm)/Al2O3 (2 nm)/Ti tri-layer memristor is investigated. The effect of Al2O3 layer embedded at the top electrode and the bottom electrode on the resistive performance of the memristor was studied. It is found that both of them can effectively improve the reliability of the device (104 cycles), the resistive window (>103), the tunable synaptic linearity and reduce of the operating voltage. RRAM with Al2O3 embedded at the top electrode have higher uniformity and LTP linearity, while those with Al2O3 embedded at the bottom electrode significantly reduce the operating current (∼10 μA) and improve LTD linearity. Electron transport mechanisms were compared between single-layer HfO2 and tri-layer Al2O3/HfO2/Al2O3 samples under DC scanning. The results showed that the thin Al2O3 layer at the top electrode led to Fowler Northeim tunneling in the low-resistance state, while the thin Al2O3 layer at the bottom electrode led to Schottky emission in the high-resistance state. The Al2O3/HfO2/Al2O3 memristors were successfully used to achieve synaptic properties, including enhancement, inhibition, and spike time-dependent plasticity, demonstrating an important role in high-performance neuromorphic computing applications.
Hölder regularity for collapses of point-vortices
Authors: Donati Martin , Godard-Cadillac Ludovic 
Published: September 2023

Abstract
The first part of this article studies the collapses of point-vortices for the Euler equation in the plane and for surface quasi-geostrophic equations in the general setting of α models. In these models the kernel of the Biot–Savart law is a power function of exponent

−
α

. It is proved that, under a standard non-degeneracy hypothesis, the trajectories of the point-vortices have a Hölder regularity up to the time of collapse. The Hölder exponent obtained is

1

/

(
α
+
1
)

and this exponent is proved to be optimal for all α by exhibiting an example of a three-vortex collapse. The same question is then addressed for the Euler point-vortex system in smooth bounded connected domains. It is proved that if a given point-vortex has an accumulation point in the interior of the domain as t → T, then it converges towards this point and displays the same Hölder continuity property. A partial result for point-vortices that collapse with the boundary is also established: we prove that their distance to the boundary is Hölder regular.
Distribution patterns of reactive species in the interaction between atmospheric pressure plasma jet and fiber membrane
Authors: Kong Xianghao , Li Sisi , Li Haoyi , Yang Weimin , Yang Dezheng , Ning Wenjun , Wang Ruixue 
Published: September 2023

Abstract
Surface modification of polymer fiber membranes using atmospheric pressure low-temperature plasma has gained significant attention in recent years. The effectiveness of surface modification determined by the uniform distribution of reactive species when plasma touching the fibers. In this study, we investigated the distribution patterns of plasma reactive species on the fibers surface with different fiber spacings by both experiment and modeling. The results revealed that reduced fiber spacing produced an obstructive effect on the propagation of reactive species. This obstruction was primarily caused by the accumulation of a significant charge on the windward side of the fiber. Consequently, there was a substantial difference in the fluxes of reactive species between the windward and leeward sides of the fiber membrane, resulting in poor uniformity of the reactive species distribution. It was worth noting that the fluxes of reactive species exhibited a double-peak distribution on the circumferential surface of the fiber filaments. This phenomenon was attributed to the coupling effect between the fiber filaments, wherein the electric field strength was higher within the gap. High electric field strength facilitated the generation and propagation of reactive species. However, as the fiber spacing decreased, the propagation of high field strength became limited until it merged into the fiber gap.
Piezo-phototronic enhanced dual-wavelength InGaN/GaN multiple quantum wells Micro-LED arrays
Authors: Yin Yu , Chen Renfeng , Duo Yiwei , He Rui , Yang Jiankun , Ji Xiaoli , Long Hao , Wang Junxi , Wei Tongbo 
Published: September 2023

Abstract
As a promising technology for next-generation displays due to their high brightness and low power consumption, InGaN-based micro light-emitting diodes (Micro-LEDs) have attracted great attention in recent years. In this work, we detailedly investigate the carrier recombination and transportation process in dual-wavelength InGaN/GaN multiple quantum wells (MQWs) Micro-LED arrays under piezo-phototronic effects using electroluminescence (EL) and time-resolution photoluminescence measurements. With the increase of external strain, the violet EL intensity of dual-wavelength Micro-LED arrays first increases obtaining a maximum enhancement of ∼12% and then decreases, whereas blue EL emission almost maintains constant. Additionally, as the size of Micro-LED decreases, the enhancement obtained via piezo-phototronic effect will reduce, which is attributed to their inherently weaker piezoelectric polarization effect. Combining with dynamic analysis of carriers in the blue quantum well (QW), it is concluded that strain-induced interface polarized charges promote the wave function overlap of electron–hole pair, but reduce the injection of hole carriers in blue QW. Superposition of the above two factors enables the blue EL intensity stable under piezoelectric coupling. These results present a promising potential of piezo-phototronic effects to improve the Micro-LEDs devices.
A small-scale swimmer actuated by acoustic radiation force
Authors: Liu Junming , Wang Xin , Yu Hang , Wang Le , Chen Si 
Published: September 2023

Abstract
A small-scale swimmer based on a piezoelectric actuator is proposed in this work, which could serve as the thruster for a minitype underwater robot. The out-of-plane stretching vibration mode in the thickness direction of the piezoelectric actuator is selected as the operating mode. Acoustic radiation propultion is generated due to the difference in acoustic impedance between solid and liquid media, then the opposite acoustic driving force makes the swimmer move forward. The vibration modes of piezoelectric actuator in dry and wet modals are compared through the finite element simulation, and verified by mechanical vibration characteristic test. Then a prototype with the size of Φ 37 mm × 45 mm is fabricated. The underwater performance shows that its linear speed achieves 33.93 mm s−1 under the voltage of 160 Vp–p with the frequency of 900 Hz and has a capacity of carrying 20 g loads, which confirms the feasibility of the proposed underwater driving method.
Seismic response analysis of single-degree-of-freedom systems with superelastic monocrystalline CuAlBe SMAs
Authors: Qiu Canxing , Tang Yuqing , Liu Hang , Du Xiuli 
Published: September 2023

Abstract
Although the potential of shape memory alloys (SMAs) in seismic applications has been well recognized, the majority of the past research was directed to NiTi SMAs. This study aims to investigate the feasibility of using a novel type of SMA, termed superelastic monocrystalline CuAlBe SMA, in seismic vibration control. According to prior loading tests, CuAlBe SMAs had an excellent superelasticity behavior with the largest recoverable strain over 25%. Within the superelastic range, CuAlBe SMAs shown unloading behavior which was dependent on the strain amplitude in the present cycle, which could not be captured by current constitutive models. Hence, a new constitutive model was firstly proposed to simulate the hysteretic behavior of CuAlBe SMAs, and a good agreement is found between the experimental data and numerical simulations. And then, to explore the characteristics and advantages in terms of seismic applications, case studies on single-degree-of-freedom (SDOF) systems with NiTi and CuAlBe SMAs were carried out. Finally, two design methods were used to size the NiTi and CuAlBe SMAs, and the corresponding SDOF systems were subjected to two ensembles of earthquakes associated with frequently occurred and design basis seismic hazard levels. The simulation results indicated that, compared with NiTi SMAs, CuAlBe SMAs could more effectively control the displacement and acceleration demands, if their ductility capacity was fully utilized in the design procedure.
Absorption modulation of quasi-BIC in Si–VO2 composite metasurface at near-infrared wavelength
Authors: Dai Hongxiang , Liu Jukun , Ju Jiaqi , Cheng Ke 
Published: September 2023

Abstract
Bound states in the continuum (BIC) have attracted great attention in nanophotonics in the past few years. The metasurface with inverted symmetry breaking exhibits high Q resonance through quasi-BIC (Q-BIC), which realizes light modulation, sensing and nonlinear generation. In this work, a symmetry-broken Si–VO2 composite metasurface is studied and modulate near-infrared light absorption in Q-BIC mode. First, a L-shaped Si metasurface with broken C4v symmetry is designed, which realizes the transition from BIC to Q-BIC and shows strong circular dichroism. Later, phase-change material VO2 is integrated into the L-shaped Si metasurface. By changing the ambient temperature, the Si–VO2 composite metasurface shows distinct light absorption characteristics, including insensitivity to incident angle and a maximum absorption modulation of up to 210%. The results show that VO2 can effectively modified Q-BIC resonator to realize the modulation absorption of near-infrared light.
Darboux transformation and explicit solutions for the Kaup-Kupershmidt equation
Authors: Liu Tongshuai , Xia Tiecheng 
Published: September 2023

Abstract
In this paper, the N-fold Darboux transformation of the Kaup-Kupershmidt equation associated with 3×3 order spectral problem is constructed by means of the gauge transformation. By applying the Darboux transformation, some soliton solutions of this equation are derived.
Microstructural analysis of microwave processed EWAC + Cr3C2 cladding on SS-304 substrate
Authors: Srivastava Sharat Chandra , Murtaza Qasim , Kumar Paras 
Published: September 2023

Abstract
The surface layer of SS-304 substrate was modified by a composite cladding of EWAC + Cr3C2 (20%, 40%, & 60% by weight) powder performed by utilizing the concept of microwave hybrid heating technique. The experimental testing was carried out in a home microwave applicator with an Al2O3 shield. Claddings of around 1 mm thickness were produced by exposing materials to microwave irradiation at a frequency of 2.45 GHz and 900 W of power. The entire system was exposed to microwave environment for about 360 s. The microstructural findings showed that the clads were produced via efficient metallurgical bonding, which entailed melting of clad powder along with diffusion of the substrate surface layer. The clads showed hard carbides in a columnar dendritic structure surrounded by a softer nickel-iron based matrix. The XRD spectrum shows that the clad also contains solid solution of Fe/Ni, chromium carbide (Cr23C6 and Cr3C2) and various intermetallic phases like NiSi, Ni3Si, and FeNi3. The average Vickers microhardness of the microwave processed clads was observed to be 700 ± 31 HV for EWAC + 60% Cr3C2, 580 ± 28 HV for EWAC + 40% Cr3C2 and 460 ± 23 HV for EWAC + 20% Cr3C2 respectively. The observed microhardness for all cases was higher than the substrate microhardness (260 ± 5 HV), which indicates the usefulness of the cladding for wear resistance applications.
Effect of coherent edge-localized mode on transition to high-performance hybrid scenarios in KSTAR
Authors: Lee Youngho , Kim S.K. , Kim J.W. , Kim B. , Park M.S. , Kwon J.M. , Choi M.J. , Hahn S.H. , Lee M.W. , Yang S.M. , Hong S.C. , Lee C.Y. , Park S.J. , Byun C.S. , Kim H.-S. , Chung J. , Na Yong-Su 
Published: September 2023

Abstract
This paper deals with one of the origins and trigger mechanisms responsible for the observed performance enhancements in the hybrid scenario experiments conducted in Korea Superconducting Tokamak Advanced Research (KSTAR). The major contribution to the performance improvement comes from a broader and higher pedestal formation. The increase of fast ion pressure due to a plasma density decrease also contributes substantially to the global beta. Although the reduced core plasma volume resulting from the pedestal expansion has a negative effect on the core thermal energy, a considerable confinement improvement observed in the inner core region limits the degradation. The one significant characteristic of high-performance discharges is the presence of Coherent Edge-localized Mode (CEM) activity. CEM is triggered during the pedestal recovery phase between typical ELM crashes and has been found to be related to the increase of particle and heat transport. It appears to underlie two commonly observed phenomena in high-performance hybrid scenario discharges in KSTAR; pedestal broadening and continuous density decrease. Despite the associated transport increase, CEM activities can induce performance enhancement. With the pedestal broadening, ELM crashes become delayed and weakened, which, in turn, allows for a higher pedestal. Moreover, the density decrease directly increases fast ion pressure by extending the beam-slowing-down time. The linear gyrokinetic analysis reveals that the increase of fast ions could initiate positive feedback loops, leading to the stabilization of Ion Temperature Gradient mode in the inner core region.
Estimation of wall forces solely from magnetic measurements: an application to RFX-mod experiment
Authors: Abate D. , Yanovskiy V. , Bonotto M. , Cordaro L. , Marchiori G. , Pigatto L. , Pustovitov V.D. 
Published: September 2023

Abstract
The estimation of integral wall force using solely magnetic measurement in RFX-mod experiment is presented. The vertical and sideways forces are directly obtained from the magnetic field measured outside the vacuum vessel. Several theoretical predictions related to tokamak are also verified for the reversed field pinch configuration. The contribution of different modes to the force is also considered and analyzed. This method of calculation would be relevant for future nuclear fusion reactors where magnetic measurements will be located only outside the vacuum vessel.
Potential roles of birds diversity in optimizing sustainable oil palm plantations at PT Gunung Tua Abadi
Authors: Putri M M , Kwatrina R T 
Published: September 2023

Abstract
Indonesia has declared the green economy paradigm; as one of the strategic sectors in implementing the green economy, oil palm plantations are expected to start reducing the use of chemical fertilizers, fungicides, pesticides and etc. Additionally, oil palm plantations are expected to be able to optimize the roles of biodiversity in oil palm plantations. So, it will enhance sustainable and environmentally friendly plantation management. Therefore, there is a need for further studies on the species potential and role of birds in oil palm plantations. The study was conducted on four types of land cover at PT Gunung Tua Abadi (PT GTA) with a line transect method in the morning and afternoon with three repetitions. The number of bird species in the Young Oil Palm (YP) is as many as 20. Meanwhile, the lowest number of species was found in Medium Oil Palm (MP) and Old Oil Palm (OP), as many as 10 species. In addition, if grouped by a guild, the birds in PT GTA belong to 8 guilds. Each type of guild is thought to have its role to assist in oil palm operations, including the role of controlling insect pests (Centropus sinensis, Centropus bengalensis, Collocalia linchi); seed dispersal (Trerons vernans), and also as pest control (Tyto alba, Elanus caeruleus). Further research is needed to determine more deeply the effectiveness of the role of each bird species in oil palm plantation.
The role of birds diversity in increasing oil palm productivity at PT Permata Sawit Mandiri, West Kalimantan
Authors: Perdhana R D 
Published: September 2023

Abstract
The expansion of oil palm plantations has reaped many damaging accusations, namely as the leading cause of deforestation, and is responsible for the decline in biodiversity. Oil palm cultivation cannot be separated from pest attacks that affect its quality and quantity. Besides being expensive, pesticides can cause environmental damage and decrease palm oil productivity. Therefore, optimizing the utilization of biodiversity in its management is necessary. As insectivores, birds significantly control pests that attack oil palm plants and also have other beneficial roles for oil palm plantations. This study aims to identify the diversity of bird species and the role of various bird species in the oil palm plantation of PT Permata Sawit Mandiri, West Kalimantan. Data were collected using a combination of line transects, point observation methods, and vegetation analysis methods. Meanwhile, data related to the role of birds in oil palm plantations were obtained through a literature study. The total species of birds found in oil palm plantations were 38 species in 6 land cover locations. The highest number of bird species was found in Secondary Forest in block G12 land cover and based on the type of feed, most bird species also found in this land cover (20 species), which acts as natural pollinators, seed dispersers, and pest control. While the least species of birds were found in oil palm with the oldest planting year (3 species). The diversity and the role of bird species found in secondary forests and rubber forests bordering oil palm plantations have the potential to source food, pollination, and pest control for birds in oil palm plantations.
Diversity and the role of butterflies species at PT Permata Sawit Mandiri, West Kalimantan
Authors: Ningrum I K 
Published: September 2023

Abstract
The use of chemicals indicates a cost inefficiency and makes oil palm plantations considered environmentally unfriendly causing a decrease in environmental quality. These problems indicate the need to increase the role of biodiversity to optimize oil palm productivity and be environmentally friendly. Based on this, research is needed on the diversity and role of butterfly species in palm oil agrosystems. The purpose of this study is to identify the species of butterflies in various land cover and analyzes the role of butterflies in the palm oil agrosystem. The research was conducted at PT Permata Sawit Mandiri, West Kalimantan. Diversity data was obtained through pollard transect and trapping methods, while role data was obtained through the literature study method. The pollard transect method was carried out along a line measuring 2 × 1,000 m long and 10 m wide at 08.00-11.00. The trapping method was carried out by placing 5 traps in each observation line for 3 × 24 hours. The results showed that there were 190 individuals belonging to Papilionidae (3 species), Pieridae (8 species), Nymphalidae (37 species), Lycaenidae (7 species), and Hesperidae (4 species). There are variations of butterfly species between land covers with the highest number of species found in rubber gardens (27 species). 7 species of butterflies have the potential as oil palm pollinators with the highest potential owned by Elymnias hypermnestra. The Papilionidae (Graphium agamemnon, Papilio polytes, Papilio memnon) can be environmental bioindicators because more sensitive to the environment.
Biodiversity tourism: a concept for oil palm villages sustainable revitalization
Authors: Yusrini L , Sunkar A , Santosa Y , Rachmawati E 
Published: September 2023

AbstractRural resilience has become an interestingly debated topic in recent years, with scholars offering opposing viewpoints. Studies have suggested that rural resilience is arguably better than that of urban. Especially in the context where the rural is supported economically by the existence of some businesses such as oil palm plantations. However, certain negative images are still linked to oil palm plantations, in particular with respect to biodiversity loss, despite many of the plantations having areas of high conservation value (HCV). HCVs are known to possess and attract wild species such as elephants, orangutans, and other primates, meaning that ecologically, HCV represents a significant added value of the oil palm plantations. This conceptual paper aims to contribute to this debate by envisioning feasible futures of biodiversity tourism for oil palm village revitalization by utilizing the biodiversity richness of HCVs. This study includes a conceptual model of biodiversity tourism for oil palm village revitalization that was developed using a causal loop diagram approach. The causal loop diagram depicts an overall understanding and describes the village system’s complexity. Positive and negative loops that form the reinforcement and balance circles represent the connection between the input and output variables. A systematic literature review and interviews with pilot village stakeholders were used to collect data. The potential of such a vision is discussed before finally concluding with an insight into the future of biodiversity tourism for oil palm village revitalization. This paper recognizes that biodiversity tourism for oil palm village revitalization can be done sustainably by presenting it as a complex system with its subsystems. It shows that oil palm villages and biodiversity are interdependent and interconnected. Moreover, biodiversity tourism can be recognized as a vehicle to promote the positive impacts of oil palm plantations in enhancing knowledge and awareness of biodiversity conservation beyond existing economic value.
Superposing and modulating heterogeneous optical vortices of high-order orbital angular momentum
Authors: Zhang Yidan , Luo Hao , Li Peng , Guo Hao , Sang Suling , Gu Yuzong , Wu Zhenkun 
Published: September 2023

Abstract
This article reports the preparation of high orbital angular momentum (OAM) using non-uniform beam interference both theoretically and experimentally. This study commences with the reconstruction of Bessel–Gaussian vortex beams utilizing power-exponential-phase vortices. Subsequently, two reconstructed beams are used for interfere, followed by the application of the phase multiplication technique. This methodology enables higher-order operations on the interfered beams, thereby escalating their topological charges and facilitating the attainment of high-orbit angular momentum. The implementation of these methods is especially relevant in the realms of optical manipulation and remote sensing. Lastly, the high OAM optical vortex is subjected to rotation at any controllable angle. This manipulation introduces an additional degree of freedom for particle operations, thereby expanding their application prospects.