bluuebunny/crossref_metadata_2025_split huggingface dataset:
Acoustic properties of underwater acoustic metamaterials based on multi-physical field coupling model
Authors: Dong Kaiyuan , Lv Yiwen , Wang Peng , Cheng Wei , Li Han 
Published: March 2024

Abstract
In this paper, according to the internal structure of underwater acoustic metamaterial, a multi-physical field coupling model of underwater acoustic metamaterial is established by using finite element analysis. Based on the model, the influence of typical underwater acoustic metamaterial structure and material parameters on sound absorption performance is studied. The results show that increasing the height or radius of the local resonance mass unit in the metamaterial is beneficial to improve the low frequency sound absorption performance. With the increase of the distance between mass elements and the thickness of elastic material, the acoustic absorption performance increases first and then decreases. Increasing the elastic modulus of elastic material of the local resonance unit or matrix will lead to the decrease of low frequency sound absorption performance of the material and the improvement of high frequency sound absorption performance. Increasing the loss factor of elastic material of the local resonance unit or matrix material can broaden the sound absorption band. These rules can provide guidance for the design of underwater acoustic metamaterials.
The Influences of Element Addition on Compression Properties of β-Ti-Mo (Nb)-based Alloys
Authors: Zhou Zhengcun , Zhu Xiaobin 
Published: March 2024

Abstract
The influences of the third element addition on the compression properties of Ti-12Mo-based and Ti-33Nb-based alloys was investigated, with emphasis on the influences of element addition on Young’s modulus, superelastic strain and yield strength of water-cooling samples. It is found that the water-cooling Ti-12Mo alloy has a lower modulus, lower yield strength, and higher hyperelastic strain than that of the furnace-cooled alloy of the same composition. Al and Sn can reduce the modulus and the yield strength, and increase the superelastic strain in the above two water-cooling alloys. The decrease in yield strength and modulus is due to orthogonal martensite ɑ’. The enhancement of the superelastic strain originated from the phase transformation of the ɑ”↔βM under stress. The effect of Sn in water-cooling quaternaryTi-18Nb-5Mo-5Sn alloy is different from the above two ternary alloys, and it increases β Phase stability and volume in water-cooling Ti-18Nb-5Mo-5Sn alloy.
Research on modification of polylactic acid multifunctional composite materials for 3d printing
Authors: Zhong Yanhui , Chen Yanfang , Geng Qingfen 
Published: March 2024

Abstract
Polylactic acid is an important 3D printing material, but its further development and application in the field of 3D printing are limited due to its flammability, poor toughness, and lack of high temperature resistance. This article modifies polylactic acid wire for 3D printing by adding flame retardants aluminum hypophosphate, polycarbonate, and chain extender to prepare multifunctional composite flame retardant materials. It was found that with the increase of aluminum hypophosphate addition, the flame retardancy of polylactic acid composite materials gradually improved, while the tensile strength, impact strength, and hardness showed a decreasing trend, and the flowability decreased, but the Vicat softening temperature increased. Through 3D printing testing, when the amount of aluminum hypophosphate added is 15-20 parts, the printing quality is good and the comprehensive performance is the best, which can meet the basic usage requirements.
Facile preparation of poly(melamine formaldehyde) sponge/bacterial nanocellulose composite for oil-water separation
Authors: Feng Jia , Jin Wende , Hu Jinpeng , Cai Yiming , Zhou Guowei , Chen Xiaogang , Du Miao 
Published: March 2024

Abstract
The treatment of a large amount of oil-water mixture generated by oil leakage accidents is an environmental issue that cannot be ignored. Achieving fast and efficient oil-water separation is a goal pursued by both academia and industry. In this paper, poly(melamine formaldehyde) (PMF) sponges were modified by the hydrophilic bacterial nanocellulose (BNC) through mild and facile conditions. With increasing the concentration of BNC dispersion used, the pore size of the composite decreases. The water contact angle of the obtained PMF/BNC composite surface is 0° or so, and the underwater oil contact angle is greater than 150°. Based on its hierarchical pore structure, hydrophilicity and oil repellency, the PMF/BNC composite exhibits excellent oil-water separation efficiency and water treatment flux for layered oil-water mixture (>1.0×107L/(m2·h·bar)). In addition, the PMF/BNC composite also exhibits high water treatment flux and oil-water separation efficiency (> 95%) for oil-water emulsion with and without surfactant. Stacking several composite slices could achieve higher oil-water separation efficiency.
Forming quality analysis of TC4 titanium alloy based on SLM orthogonal process
Authors: Huang Jie , Wang Qi , Peng HongBing , Ding XuQiang , Liu Xiaona , Lu Jun 
Published: March 2024

Abstract
The TC4 titanium alloy bulk and irregular porous structures were prepared using Selective Laser Melting (SLM). This study systematically investigated the effects of laser power, scanning speed, scanning spacing, and laser energy density on the forming quality of TC4 titanium alloy specimens, through orthogonal experimental design. The research results indicate that laser power is the primary factor affecting the density of TC4 titanium alloy bulk during the SLM process. With the increase of laser energy density, the density of the specimens shows an initial increase followed by a decrease, while Vickers hardness and surface roughness exhibit a decreasing trend followed by an increasing trend. Moreover, the surface of the specimens transforms from a rough surface with a significant presence of pores, voids, or unmelted powder particles to a relatively smooth and flat surface, accompanied by a reduction in the size and quantity of pore defects.
Study on efficient oil-containing wastewater purification with super-hydrophilic PVDF coating
Authors: Wang Xiepeng , Qi Zhouyu , Xia Mengsheng , Gao Junkai 
Published: March 2024

Abstract
The sustainable, low-energy, and cost-effective treatment of oily wastewater has become an important issue for aquatic ecosystems, environmental protection, and economic development. Improper treatment could have a significant impact on aquatic ecosystems, resulting in eutrophication and fish deaths. The method for preparing PVDF-CC by impregnation involves using polyvinylidene fluoride (PVDF), chitosan, and sodium citrate. Moreover, these performance improvements can be achieved at a lower cost compared to using many other chemical agents in membrane processing.
Study on efficient degradation of tetracycline by titania nanoribbons modified with silver
Authors: Fu Ying , Du Yuanyuan , Wang Ruixue , Zhang Xinyu , Gao Xing 
Published: March 2024

Abstract
TiO2 nanoribbons were prepared by hydrothermal method using P25 as titanium source, and Ag/TiO2 composites were prepared by REDOX method. Xenon lamp was used as the light source to study the photocatalytic degradation efficiency of tetracycline by Ag/TiO2 and tetracycline degradation efficiency under different conditions. When the initial concentration of tetracycline was 50mg/L, the pH value was 8, and the catalyst dosage was 0.05g. The optimal reaction conditions showed that the degradation efficiency of tetracycline by Ag/TiO2 composite could reach 88.9%, which was 12% higher than that of TiO2.
Constitutive model of piezoelectric/shape memory polymer composite
Authors: Zhao Fei , Zhou Bo , Zhu Xiuxing , Wang Haijing 
Published: March 2024

Abstract
The PZT/SMP composite material, combining piezoelectricity and shape memory effects, has emerged as a novel multifunctional smart material and has gained significant attention. The establishment of an effective constitutive model, describing the mechanical properties of the composites, holds tremendous importance in both theoretical and engineering realms. This study aims to develop a model to investigate the mechanical properties of PZT/SMP composites. By incorporating the deformation mechanisms of the PZT/SMP composites and the theories of viscoelasticity, the constitutive equation for PZT/SMP composites has been established. Based on composite material theory and the properties of transversely isotropic materials, combined with the material parameter equations for SMP, the material parameter equations of PZT/SMP composites have been established. Using the polarization direction of the composite material as an example, we conduct simulation analyses on PZT/SMP composites with various volume fractions of PZT particles by using the developed constitutive model. The variations in material parameter performance, piezoelectric performance, and shape memory performance are investigated. The simulation results demonstrate that an increase of PZT content in the PZT/SMP composite enhances both the piezoelectric and mechanical properties of the composite material, which significantly influences the shape memory process.
Research on corrosion behavior of safety valve spring in liquid chlorine tank
Authors: Li Qingshan , Jiang Jiwu , Yang Bing , Chen Zheming , Yang Lijun , Jin Muda , Xia Xinhua , Xie Xumeng 
Published: March 2024

Abstract
The corrosion behavior of the safety valve spring in the liquid chlorine tank is investigated in this study. The chemical composition, metallographic structure and hardness of the spring are also analyzed. The higher hardness of spring steel is caused by lower tempering temperatures. The corrosion product is grey with many cracks, spalling and pitting is also found. The phenomenon that where there is higher chloride, there is higher carbon is observed. Chloride ion is adsorbed by carbides and then pitting preferentially nucleate at carbides.
Effects of plasma surface quenching on strength and crack resistance property of PCrNi3 Mo steel
Authors: Jiang Qiang , Wang Shuogui 
Published: March 2024

Abstract
Plasma surface quenching technology uses a high-energy beam to rapidly heat the PCrNi3Mo steel material. Simultaneously, the treated workpiece is rapidly cooled by its own heat transfer to realize surface quenching. The metallographic structure showed that the grains of the PCrNi3Mo steel treated by plasma quenching were significantly refined. The DEFORM software was utilized to simulate the heat treatment process, and the results showed that the martensitic volume fraction of the plasma quenching treatment of PCrNi3Mo steel was as high as 83.6%~95.9%, and the simulated hardness value was HRC55~57. The actual hardness of the specimen after plasma surface quenching was HRC54~56, which was in good agreement with the simulation value. The plasma was employed to treat the PCrNi3Mo steel tensile specimen, the processing depth was only 1/10 of the thickness of the specimen. Through the MTS tensile experiment, it was observed that the tensile strength of specimens treated with plasma increased by 9.2% when compared to the untreated specimens. Despite the high hardness of the treated specimen, fracture strain exceeded 7%. Furthermore, before the fracture of the tensile specimen occurred, the plasma quenching part effectively prevented crack propagation and delayed fracture, and the fracture necking phenomenon of the specimen was not obvious.
The effect of chemical composition and heat parameter on Nano-sized precipitate dispersion characterization in ODS steels
Authors: Xie Rui , Lyu Zheng , Wang Qing , Liu Chunming 
Published: March 2024

Abstract
Oxide dispersion strengthened (ODS) supersaturated solid solution alloy powders with different Y/Ti atomic ratios were formed by mechanical alloying (MA) method and then heat treated under different conditions. The morphology, phase composition, and particle size distribution were researched. The precipitate distribution densities and hardness values of alloy powders after heat treatment were measured at the same time by the SAXS method and hard tester. The results show that the morphology of MA alloy powders is irregular in shape and only a small amount of MA alloy powders is bigger than 30 μm. During the MA process, alloy elements are solid solutions in the matrix. The work-harden effect of alloy powders formed in the MA process would be eliminated during the heat treatment process. The chemical composition and heat treatment parameters are crucial effects on nano-sized precipitate distribution characterization in ODS steels. The ODS sample with a Y/Ti atomic ratio of 0.99 has the highest distribution density of oxide precipitates at 1.89×1022/m3 resulting in the highest hardness value during the heat treatment process. The sample with a Y/Ti atomic ratio of 0.42 has the highest distribution density of nanoclusters 7.32×1023/m3.
ATLAS ITk strip detector for the Phase-II Upgrade
Authors: Herde H. ,   the ATLAS-ITk Strip collaboration
Published: March 2024

Abstract
The inner detector of the present ATLAS experiment has been designed and developed to
function in the environment of the present Large Hadron Collider (LHC). At the ATLAS Phase-II
Upgrade, the particle densities and radiation levels will exceed current levels by a factor of
ten. The instantaneous luminosity is expected to reach unprecedented values, resulting in up to
200 proton-proton interactions in a typical bunch crossing. The new detectors must be faster and
they need to be more highly segmented. The sensors used also need to be far more resistant to
radiation, and they require much greater power delivery to the front-end systems. At the same
time, they cannot introduce excess material which could undermine tracking performance. For those
reasons, the inner tracker of the ATLAS detector was redesigned and will be rebuilt completely.

The ATLAS Upgrade Inner Tracker (ITk) consists of several layers of silicon particle
detectors. The innermost layers will be composed of silicon pixel sensors, and the outer
layers will consist of silicon microstrip sensors. This contribution focuses on the strip
region of the ITk. The central part of the strip tracker (barrel) will be composed of
rectangular short (∼2.5 cm) and long (∼5 cm) strip sensors. The forward regions
of the strip tracker (end-caps) consist of six disks per side, with trapezoidal shaped
sensors of various lengths and strip pitches. After the completion of final design reviews
in key areas, such as Sensors, Modules, Front-End electronics, and ASICs, a large scale
prototyping program has been completed in all areas successfully. We present an overview of
the Strip System and highlight the final design choices of sensors, module designs and
ASICs. We will summarise results achieved during prototyping and the current status of
pre-production and production on various detector components, with an emphasis on QA and QC
procedures.
Daytime cooling efficiencies of urban trees derived from land surface temperature are much higher than those for air temperature
Authors: Du Meng , Li Niantan , Hu Ting , Yang Qiquan , Chakraborty TC , Venter Zander , Yao Rui 
Published: March 2024

Abstract
Accurately capturing the impact of urban trees on temperature can help optimize urban heat mitigation strategies. Recently, there has been widespread use of remotely sensed land surface temperature (T
s) to quantify the cooling efficiency (CE) of urban trees. However, remotely sensed T
s reflects emitted radiation from the surface of an object seen from the point of view of the thermal sensor, which is not a good proxy for the air temperature (T
a) perceived by humans. The extent to which the CEs derived from T
s reflect the true experiences of urban residents is debatable. Therefore, this study systematically compared the T
s-based CE (CE
T

s) with the T
a-based CE (CE
T

a) in 392 European urban clusters. CE
T

s and CE
T

a were defined as the reductions in T
s and T
a, respectively, for every 1% increase in fractional tree cover (FTC). The results show that the increase in FTC has a substantial impact on reducing T
s and T
a in most cities during daytime. However, at night, the response of T
s and T
a to increased FTC appears to be much weaker and ambiguous. On average, for European cities, daytime CE
T

s reaches 0.075 °C %−1, which is significantly higher (by an order of magnitude) than the corresponding CE
T

a of 0.006 °C %−1. In contrast, the average nighttime CE
T

s and CE
T

a for European cities are similar, both approximating zero. Overall, urban trees can lower daytime temperatures, but the magnitude of their cooling effect is notably amplified when using remotely sensed T
s estimates compared to in situ T
a measurements, which is important to consider for accurately constraining public health benefits. Our findings provide critical insights into the realistic efficiencies of alleviating urban heat through tree planting.
More on symmetry resolved operator entanglement
Authors: Murciano Sara , Dubail Jérôme , Calabrese Pasquale 
Published: March 2024

Abstract
The ‘operator entanglement’ of a quantum operator O is a useful indicator of its complexity, and, in one-dimension, of its approximability by matrix product operators. Here we focus on spin chains with a global U(1) conservation law, and on operators O with a well-defined U(1) charge, for which it is possible to resolve the operator entanglement of O according to the U(1) symmetry. We employ the notion of symmetry resolved operator entanglement (SROE) introduced in Rath et al (2023 PRX Quantum
4 010318) and extend the results of the latter paper in several directions. Using a combination of conformal field theory and of exact analytical and numerical calculations in critical free fermionic chains, we study the SROE of the thermal density matrix

ρ
β

=

e

−
β
H

and of charged local operators evolving in Heisenberg picture

O
=

e

i
t
H

O

e

−
i
t
H

. Our main results are: i) the SROE of

ρ

β

obeys the operator area law; ii) for free fermions, local operators in Heisenberg picture can have a SROE that grows logarithmically in time or saturates to a constant value; iii) there is equipartition of the entanglement among all the charge sectors except for a pair of fermionic creation and annihilation operators.
Numerical analysis of scaffold degradation in cryogenic environment: impact of cell migration and cell apoptosis
Authors: Deshmukh Khemraj , Bit Arindam 
Published: March 2024

Abstract
The analysis of degradation in the presence of cell death and migration is a critical aspect of research in various biological fields, such as tissue engineering, regenerative medicine, and disease pathology. In present study, numerical study of degradation of scaffold were performed in present of cells, cell apoptosis and cell migration. A poly electrolyte complex (PEC) silk fibroin scaffold was used for degradation study. Degradation study in the presence of cells and migration were performed at fixed pH concentration 7.2. Similarly, degradation study of scaffold were performed at different pH cell apoptosis. A transient analysis of scaffold was evaluated in COMSOL 5.5 in presence of cryogenic temperature at different temperature gradient. The parameters; temperature, stress, strain tensor and deformation gradient associated with the degradation of polyelectrolyte complex scaffold were evaluated. Result shows that in both geometries minimum temperature had been achieved as 230.051 K at point P4 in series view and parallel view and at a point P3 for cell migration study for −5 k min−1 and −1 k min−1, respectively. The maximum stress had been generated for 5.57 × 107 N m−2 for the temperature gradient of −2 K min−1 at T cycle in the case of cell migration study. In contrast in series view the maximum stress 2.9 × 107 N m−2 were observed at P4 which was higher as compare to P3. Similarly, for a parallel view, maximum stress (3.93 × 107 N m−2) was obtained for point P3. It had been observed that the maximum strain tensor 5.21 × 10−3, 5.15 × 10−3 and 5.26 × 10−3 was generated in series view at 230 k on a point P3 for − 1, −2 and −5 K min−1, respectively. Similarly, the maximum strain tensor 8.16 × 10−3, 8.09 × 10−3 and 8.09 × 10−3 was generated in parallel view at 230 k on a point P3 for −1, −2 and −5 K min−1, respectively. In the presence of cells, at a point P4 for temperature gradient of −1 and −2 K min−1, it had been closed to the scaffold wall, which had a different temperature profile than the point P3 and scaffold comes to the contact with the cells. The analysis of PEC scaffold degradation in the presence of cells, including cell apoptosis and migration, offers significant insights into the relationship between scaffold properties, cell behaviour, and tissue regeneration.
Ultrasound-driven triboelectric and piezoelectric nanogenerators in biomedical application
Authors: Kao Fu-Cheng , Hung Shih-Feng , Yang Chang-Chi , Parashar Parag , Huang Chun-Ju , Hsieh Ming-Kai , Liao Jen‐Chung , Lai Po-Liang , Fu Tsai-Sheng , Tsai Tsung-Ting , Lin Zong-Hong 
Published: March 2024

Abstract
Microelectronics play a crucial role in medical settings by monitoring physiological signals, treating illnesses, and enhancing human well-being. For implanted and wearable devices, a reliable and continuous energy source is essential. While conventional energy systems rely on batteries and external power connections, their drawbacks, including the need for frequent charging, limited battery lifespan, and the potential for reoperation, restrict their utility. This has spurred the exploration of self-sustaining, long-lasting power solutions. The ultrasound-driven nanogenerator, a promising energy source, harnesses biomechanical energy from activities like muscle movement, heartbeat, respiration, and gastric peristalsis. It converts this energy into electrical signals, enabling the detection of physiological and pathological markers, cardiac pacing, nerve stimulation, tissue repair, and weight management. In this review, we provide an overview of triboelectric (TENG) and piezoelectric (PENG) nanogenerator design with ultrasound and its applications in biomedicine, offering insights for the advancement of self-powered medical devices in the future. These devices hold potential for diverse applications, including wound treatment, nerve stimulation and regeneration, as well as charging batteries in implanted devices.