bluuebunny/crossref_metadata_2025_split huggingface dataset:
Symmetric exclusion process under stochastic power-law resetting
Authors: Mishra Seemant , Basu Urna 
Published: May 2023

Abstract
We study the behaviour of a symmetric exclusion process in the presence of non-Markovian stochastic resetting, where the configuration of the system is reset to a step-like profile at power-law waiting times with an exponent α. We find that the power-law resetting leads to a rich behaviour for the currents, as well as density profile. We show that, for any finite system, for α < 1, the density profile eventually becomes uniform while for α > 1, an eventual non-trivial stationary profile is reached. We also find that, in the limit of thermodynamic system size, at late times, the average diffusive current grows

∼

t
θ

with

θ
=
1

/

2

for

α
⩽
1
/
2

,

θ
=
α

for

1

/

2
<
α
⩽
1

and θ = 1 for α > 1. We also analytically characterize the distribution of the diffusive current in the short-time regime using a trajectory-based perturbative approach. Using numerical simulations, we show that in the long-time regime, the diffusive current distribution follows a scaling form with an

α
−

dependent scaling function. We also characterise the behaviour of the total current using renewal approach. We find that the average total current also grows algebraically

∼

t

ϕ

where

ϕ
=
1

/

2

for

α
⩽
1

,

ϕ
=
3

/

2
−
α

for

1
<
α
⩽
3

/

2

, while for

α
>
3

/

2

the average total current reaches a stationary value, which we compute exactly. The standard deviation of the total current also shows an algebraic growth with an exponent

Δ
=

1
2

for

α
⩽
1

, and

Δ
=
1
−

α
2

for

1
<
α
⩽
2

, whereas it approaches a constant value for α > 2. The total current distribution remains non-stationary for α < 1, while, for α > 1, it reaches a non-trivial and strongly non-Gaussian stationary distribution, which we also compute using the renewal approach.
Numerical optimization of billet diameter in the wide-spread and split extrusion process
Authors: Wang Ruilong , Lei Tongfei , He Xinxin , Jin Weiwen 
Published: May 2023

Abstract
The research object was the wide-spread shunt extrusion production of large-diameter thick-walled AZ31 magnesium alloy pipe with 360mm outer diameter and 10mm wall thickness. Based on the DEFORM-3D finite element software platform, the simulation study on the influence of billet diameter on extrusion pressure was carried out to provide theoretical support for the reasonable selection of equipment tonnage. The results show that the peak extrusion pressure increases with the increase of billet diameter, and the increasing speed is accelerated. By reducing the billet diameter, the peak extrusion pressure can be gradually reduced from 4800 tons to 2200 tons, and the maximum extrusion cargo can be saved by more than 50%. If 3600 tons extruder is used, the billet diameter should be less than 325mm; If 2500 tons extruder is used, the billet diameter should be less than 285mm.
Aerodynamic parameter calculation and ballistic stability research of special projectile
Authors: Jiang Bin’an , Zhang Hang 
Published: May 2023

Abstract
Based on the aerodynamic layout of special projectiles, a targeted aerodynamic parameter solution algorithm is built by a mechanical analysis model. The simulation software is used to analyze the ballistic stability. The results show that the aerodynamic layout with the center of gravity moving down is helpful to overcome the rolling interference in uncontrolled flight.
First-Principles Study on IMC Formation and Interface Failure of Electronic Packaging Solder Joints
Authors: Fu Ruyi , Huang Wei , Pan Kailin , Pi Jinzhi , Zhang Jian 
Published: May 2023

Abstract
At present, Sn-3.0Ag-0.5Cu (SAC305) solder is one of the commonly used lead-free solders, and copper-clad laminate is the commonly used PCB substrate. SAC solder and copper substrate mainly generate two intermetallic compounds (IMCs) of Cu6Sn5 and Cu3Sn during the soldering process. Based on the first principles, this paper analyzes the formation difficulty of the two kinds of IMCs generated in the soldering, and the failure mechanism of the Sn/IMC and IMC/Cu interfaces. Firstly, based on the density functional theory (DFT), the “CASTEP” module in Material Studio (MS) is used to analyze the formation difficulty of the two IMCs from the point of the density of states, population analysis, and energy. The results show that Cu6Sn5 is easier to generate, which also explains the reason for the first generation of Cu6Sn5 in the initial stage of soldering. Then, Sn / IMC and IMC / Cu interfaces were established in MS, and the reason why solder joint failure mainly occurred at the Sn / IMC interface was explained by energy analysis.
State of health estimation for lithium-ion battery based on improved support vector regression
Authors: Cao Chenghu , Xu Xiaohong , Ma Qiuxiang , Yang Zehua , Zheng Weiguang 
Published: May 2023

Abstract
The lithium-ion battery has grown to be one of the most popular types of energy storage because of its many great qualities. However, the state of health (SOH) of the lithium-ion battery decreases as the number of cycles increases, resulting in reduced performance or even failure of the device, so an accurate SOH is essential for the safe operation of the device. To solve the issue of existing estimate methods' low estimation accuracy, a SOH estimation approach based on improved support vector regression is proposed. Firstly, the changes in battery characteristics during charging and discharging are analyzed and the health factors characterizing the SOH degradation are extracted. Pearson and Spearman correlation coefficients are used to quantitatively analyze the correlation between SOH and health factors. In addition, by optimizing the kernel function parameters of the SVR model by IALO, the improved ant lion optimization and support vector regression (IALO-SVR) based SOH estimation technique was developed. The IALO-SVR method was validated with the NASA battery dataset, and the experimental results showed that the method can estimate SOH more accurately compared with Back Propagation Neural Network (BP) and ALO-SVR methods, with an estimation error of no more than 1.8% at most.
Algorithm design and optimization of profile cutting problem based on 0-1 knapsack algorithm
Authors: Zhao Qing , Ren Xiaolong 
Published: May 2023

Abstract
According to a one-dimensional multi-objective profile cutting machine tool and based on the principle of 0-1 knapsack algorithm and MATLAB software programming, the length of the two kinds of type and a limited number of profiles are processed to solve the maximum utilization of the profile cutting scheme, and optimize the programming algorithm for solving profile maximum cutting length, from two aspects of time complexity and space complexity analysis and comparison. Firstly, the principle of the 0-1 knapsack algorithm is used to design the algorithm to get the maximum cutting length of the corresponding two lengths. Secondly, according to the number of profiles, cutting margin and other parameters are used to select the length type of profiles. Then, the cutting size sequence of each selected profile is introduced, and the length type, quantity, cutting size sequence group, total cutting margin, profile utilization rate, and other parameters are calculated when the processing contract is completed. Finally, based on the recursive formula of jump point sequence, the algorithm is optimized to eliminate the restriction of 0-1 knapsack algorithm by integer constraints, reduce the time and space complexity of the algorithm, reduce the calculation amount and storage space of the algorithm, and improve the efficiency of the programming algorithm.
Design of high quantum efficiency SPAD single-photon detector based on metasurface
Authors: Xu Liangqiang , Feng Guilan , Huang Shanyan , Pan Jinlv , Zhao Tianqi 
Published: May 2023

Abstract
This work discusses several metasurface structure types, their manufacturing processes, and the design and simulation of nanopyramid arrays, square slot arrays, and funnel arrays to improve absorption. In particular, a silicon-based continuous thin gold film-covered deep grooved thin metal structure was constructed and examined. It surpasses the silicon materials’ absorption thresholds, considerably expanding the NIR’s absorption range to 2000 nanometers. More information is provided regarding the impact of trench depth on cavity pattern and near-infrared absorption. Its preparation process is detailed, and its compatibility with SPAD single-photon detectors is confirmed. This information is likely to encourage the use of SPAD in domains such as near-infrared optical communication and other low-light detecting technologies.
Design and simulation analysis of electric needleless syringe
Authors: Cheng Simian 
Published: May 2023

Abstract
A new design of a needleless syringe based on a moving-coil electromagnetic linear actuator drive is proposed to address the problems of the uncontrollable driving force and bulky structure commonly found in current commercial needleless syringes. The structural parameters of the moving-coil electromagnetic linear actuator with the electromagnetic driving force at different current strengths are obtained using the finite element analysis method. The results of jet stagnation pressure and jet velocity were obtained by MATLAB numerical calculation and CFD jet simulation. The process of 0.1 ml drug diffusion under the skin at a current size of 40 A was simulated. The results show that the jet stagnation pressure at the nozzle is 32 MPa, the jet velocity is 246 m/s, and the jet diffusion depth reaches 15 mm under the maximum driving force condition. The output electromagnetic force of the moving-coil electromagnetic linear actuator in this scheme is proportional to the current’s magnitude, and the actuator’s small size allows it to be used as a driving component of a hand-held needleless syringe.
Simulation and Optimization of Five-axis NC Machining of Integral Impeller Based on Improved Particle Swarm Optimization
Authors: Duan Xiangmin , Zhang Chun , You Si kai 
Published: May 2023

Abstract
The traditional impeller processing generally adopts the method of casting and polishing, which makes the impeller die manufacturing complicated. The blade precision is difficult to guarantee, the dynamic balance performance is poor, and the production cycle is long. Five-axis machining technology makes full use of the best cutting point of the tool or further optimizes the pose angle of the tool and workpiece to cut, so as to obtain higher cutting efficiency and better-machined surface quality. In the simulation experiment, it can be concluded that the proposed method can achieve convergence after 110 iterations. The substructure coupling method and response surface method converge after 150 iterations and 140 iterations respectively. Compared with the analysis results, this method can be applied to the optimization of NC machining parameters, because it adopts the adaptive decreasing method of inertia weight to improve PSO(Particle swarm optimization), which has a fast convergence speed and can quickly obtain the global optimal solution. Through the improved PSO, the optimal solution of the objective function of NC machining parameters is obtained, the optimization of NC machining parameters is realized, and the superiority and feasibility of the optimization of NC machining parameters are improved.
Characterization of AlN thin film piezoelectric coefficient d31 using Piezoelectric Micromachined Ultrasonic Transducers (PMUTs)
Authors: Zhang Zhenghu , Zhang Linwei , Wu Zhipeng , Gao Mingze , Lou Liang 
Published: May 2023

Abstract
The transverse piezoelectric coefficients d
31 of piezoelectric membranes is fundamental to the design, simulation, optimization, and applications of piezoelectric devices using Aluminum Nitride (AlN). In this work, a method based on the inverse piezoelectric effect is proposed to characterize d
31. Based on the piezoelectric equation and the thin film vibration equation, the central displacement of the Piezoelectric Micromachined Ultrasonic Transducers (PMUTs) is linearly related to the DC voltages when the PMUTs are in the linear operating region. The central displacement of PMUTs is measured by 3D Measuring Laser Microscope at various DC voltages. The finite element method (FEM) is combined with change of d
31 to approximate the relationship between displacement and voltage. Then, The proposed method is verified for its accuracy through the use of the cantilever technique where the cantilever is fabricated on the same wafer as the above PMUTs. The d
31 of the AlN thin film obtained by the proposed method and the cantilever method are -1.58pC/N and -1.60pC/N. The error of the two methods is within 2%. Ultimately, the extraction and measurement of d
31 can be achieved by the proposed method.
The record-breaking 2022 long-lasting marine heatwaves in the East China Sea
Authors: Oh Hyoeun , Kim Go-Un , Chu Jung-Eun , Lee Keunjong , Jeong Jin-Yong 
Published: May 2023

Abstract
In 2022, record-breaking long-lasting marine heatwaves (MHWs) occurred in the East China Sea (ECS), which persisted for 62 d during boreal summer. This exceeded the average MHWs duration of 10 d by a factor of 6. In addition, 2022 was also recorded as a year of many extreme events throughout Asia, such as summer floods in China and Pakistan, droughts and extreme heat in Europe, raising the question of whether they were caused by a ‘triple-dip’ La Niña, which has persisted since September 2020. Here we examine the key local and remote processes that led to the 2022 MHWs in the ECS using mixed-layer heat budget analysis. During the onset of the MHWs, a salinity-stratified shallow mixed-layer due to the large river discharge from the Yangtze–Huaihe River floods in June created favorable conditions for warm ocean temperature in the ECS. Simultaneously, an anomalous anticyclone maintained by the stationary Rossby wave, which is generated by vorticity forcings in mid-latitudes and thermal forcing in Pakistan, settled in the corresponding region and led to the long-lasting MHWs until Typhoon Hinnamnor began to dissipate the wave in early September. This study improves our understanding of the physical mechanism of flood-related MHWs that have increased with recent climate change.
Global drivers of local water stresses and global responses to local water policies in the United States
Authors: Haqiqi Iman , Bowling Laura , Jame Sadia , Baldos Uris , Liu Jing , Hertel Thomas 
Published: May 2023

Abstract
The rapid depletion of US groundwater resources and rising number of dying wells in the Western US brings attention to the significance of groundwater governance and sustainability restrictions. However, such restrictions on groundwater withdrawals are likely to generate spillover effects causing further environmental stresses in other locations and adding to the complexity of sustainability challenges. The goal of this paper is to improve our understanding of the implications of growing global food demand for local sustainability stresses and the implications of local sustainability policies for local, regional, and global food production, land use, and prices. We employ SIMPLE-G-US (Simplified International Model of agricultural Prices, Land use, and the Environment—Gridded version for the United States) to distangle the significance or remote changes in population and income for irrigation and water resources in the US. Then we examine the local-to-global impacts of potential US groundwater sustainability policies. We find that developments in international markets are significant, as more than half of US sustainability stresses by 2050 are caused by increased commodity demand from abroad. Furthermore, a US sustainable groundwater policy can cause overseas spillovers of US production, thereby potentially contributing to environmental stresses elsewhere, even as groundwater stress in the US is alleviated. These unintended consequences could include deforestation due to cropland expansion, as well as degradation in water quality due to intensification of production in non-targeted areas.
Reaction diffusion systems and extensions of quantum stochastic processes
Authors: Greenman Chris D 
Published: May 2023

Abstract
Reaction diffusion systems describe the behaviour of dynamic, interacting, particulate systems. Quantum stochastic processes generalise Brownian motion and Poisson processes, having operator valued Itô calculus machinery. Here it is shown that the three standard noises of quantum stochastic processes can be extended to model reaction diffusion systems, the methods being exemplified with spatial birth–death processes. The usual approach for these systems are master equations, or Doi-Peliti path integration techniques. The machinery described here provide efficient analyses for many systems of interest, and offer an alternative set of tools to investigate such problems.
Antibacterial coating of corona treated Poly(lactic acid) / Poly(butylene succinate) film with Chitosan and Zinc oxide nanoparticle
Authors: Hongsriphan N , Nualyung J , Yaothaisong N , Patanathabutr P 
Published: May 2023

Abstract
The biodegradable PLA/PBS 90/10 wt% films were extruded and surface treated with corona discharge. Two electrical inputs of the corona treatment were used, 2 or 6 amperes, which the change of the surface tension was evaluated using corona measuring pens. The blend films were coated with the antibacterial mixture between chitosan and zinc oxide nanoparticles (ZnO-NP) in four concentrations: 1.0/0.4, 1.0/0.5, 1.5/0.5, and 1.5/0.5 wt%/wt%. This film could be used to replace transparent disposable packaging in the circular economy. It was found that the surface tension of the blend film was 30 dyne (mN/m) which was much like the neat PLA due to PLA being the main composition. Since the overall coated film thickness was kept constant, there was no significant difference in the coating weight among four coating concentrations. Compared to the uncoated PLA/PBS film, the tensile strength of the coated films tended to be higher with the increase of ZnO-NP content. However, the elongation at break of the coated films decreased significantly, which the stiffer coating layers became the stress concentrators. From SEM, it was seen that the good adhesion between the polymer and the coating layer was achieved. When the coated films were torn apart in the trouser tear testing, the failure was the breakage of the blend film with there was some coating layer delaminated.
Optimization of microwave-assisted biodiesel production using Iron (III) oxide - Calcium oxide / Activated charcoal derived from waste Asian green mussel shell as heterogeneous catalyst
Authors: Loryuenyong V , Kaewmanee S , Rattanawaraporn S , Chimplenapanon N , Buasri A 
Published: May 2023

Abstract
The primary objective of this study was to produce a heterogeneous iron (III) oxide (Fe2O3)-calcium oxide (CaO)/activated charcoal (AC) catalyst from Asian green mussel shell utilizing wet impregnation and calcination processes for biodiesel synthesis. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and the Brunauer-Emmett-Teller (BET) method were used to analyze the novel catalyst. Using a central composite design (CCD)-based response surface methodology (RSM), the process parameters such as catalyst quantity, reaction time, and microwave electrical power were optimized. The optimal reaction conditions were determined to be 1.07 wt.% of Fe2O3-CaO/AC, 6.42 min of reaction time, and 667 W of microwave electrical power. The published results imply that the heterogeneous catalyst has a great potential for the direct conversion of waste frying oil (WFO) to biodiesel, with the ability to reuse without reactivation. The development of Fe2O3-CaO/AC as a novel heterogeneous catalyst would facilitate the manufacture of biodiesel in an eco-friendly manner.
Effects of Lignocellulose Contents in Bamboo Charcoal on Mechanical and Thermal Properties of Polybenzoxazine-based Friction Materials
Authors: Jantapanya N , Jubsilp C , Mora P , Kaewluan S , Srisorrachat S , Rimdusit S 
Published: May 2023

Abstract
The objective of this research is to study mechanical and thermal properties of polybenzoxazine-based friction materials (PFMs) filled with 10 wt% bamboo charcoal particles (BC) containing residual lignocellulose content of 0-10wt% (BC0-10%), 10-20wt% (BC10-20%) and 20-30wt% (BC20-30%). The PFMs filled with synthetic graphite particles was also prepared to compare the properties. The obtained results showed that the mechanical properties, i.e., flexural strength and flexural modulus of the PFMs were improved with an increase of the residual lignocellulose content, and tended to be higher than that of the PFMs filled with synthetic graphite particles. Thermal stability monitored by the degradation temperature at 5% weight loss (Td5) of the PFMs revealed a decrease with an increasing residual lignocellulose content in BC. However, the Td5 of the PFMs filled with BC is still higher than the generated heat during the braking, which has temperatures around 350 °C. The results suggested that the obtained composite material is a promising candidate for car brake pads.
Synthesis and characterization of calcium carbonate/carbon from water lettuce via hydrothermal carbonization process
Authors: Chaiammart N , Thu M M , Srisuk N , Mueanpun N , Panomsuwan G 
Published: May 2023

Abstract
The conversion of biomass into value-added products has recently received much attention for a broad range of applications. In this work, water lettuce was converted into calcium carbonate (CaCO3)/carbon via hydrothermal carbonization (HTC) and pyrolysis at 900 °C. The HTC temperature and time varied in the range of 160–200 °C for 6–18 h, respectively. X-ray diffraction analysis indicated that the samples consisted of a mixture of calcite and vaterite phases of CaCO3 and amorphous carbon. The ratio of calcite and vaterite phases varied with HTC time. The Fourier transform infrared spectroscopy (FTIR) result showed the characteristic absorption bands confirming the presence of CaCO3. Scanning electron microscopy (SEM) images revealed the large crystal of CaCO3 and fine carbon particles. From the N2 sorption analysis, the sample prepared from the HTC at 200 °C for 6 h had the highest specific surface area of 95 m2/g due to the development of micropores. The results presented in this work demonstrated that both HTC temperature and time play critical roles in altering the surface area and phase structure of CaCO3/carbon. The CaCO3/carbon derived from water lettuce can potentially be used and adapted for many applications.
Dry Electropolishing of Laser Powder Bed Fusion Manufactured Cobalt-chrome
Authors: Rautio T , Jaskari M , Päkkilä J , Järvenpää A 
Published: May 2023

Abstract
Cobalt-chrome (Co-Cr) has been used extensively in medical applications, gas turbines and dental products for decades now. Laser powder bed fusion (PBF-LB) manufacturing is very suitable for small series and prototyping and in this regard its application to dental products is promising as they are usually unique and high precision is required. One major factor limiting the application of the PBF-LB technique is the surface quality, which is not adequate in as built condition. This work focuses on improving the surface quality of the PBF-LB manufactured Co-Cr with dry electropolishing so that it is suitable for dental bridges. The surface quality is analysed using laser scanning microscopy for surface roughness, surface profile and topography to reveal the surface characteristics after the printing and the effect of dry electropolishing is highlighted. The results showed that dry electropolishing can be used successfully to improve the surface quality for the needs of dental bridges. Final product quality was verified by a dentist, and the dental bridge could be used on a patient.