bluuebunny/crossref_metadata_2025_split huggingface dataset:
Strange magnetars admixed with fermionic dark matter
Authors: Ferreira Osvaldo , Fraga Eduardo S. 
Published: April 2023

Abstract
We discuss strange stars admixed with fermionic dark matter in the presence of a strong magnetic field using the two-fluid Tolman-Oppenheimer-Volkov equations. We describe strange quark matter using the MIT bag model and consider magnetic fields in the range ∼ 1017 - 1018 G. For the fermionic dark matter, we consider the cases of free particles and strongly self-interacting particles, with dark fermion masses m = 5, 100, 500 GeV. We discuss the effects of dark matter and a strong magnetic field on the masses and radii of the stars, as well as on its tidal deformability. Even though strong magnetic fields contribute to decreasing the total mass of the star, they attenuate the rate of decrease in the maximum mass brought about by increasing the dark matter fraction in the admixed system. The most intensely affected observable, however, is the tidal deformability, with variations on the range of 70%-90% for reasonable values of the magnetic field or dark matter central energy density.
Tunable continuous-wave laser operation of Nd:YAG around 1.3 μm
Authors: Zhu Yifeng , Yu Lintao , Fu Xinhua 
Published: April 2023

Abstract
A tunable continuous-wave (cw) Nd:YAG laser using a birefringent filter (BF) was performed at six different laser wavelengths of 1319, 1334, 1338, 1341, 1353 and 1356 nm based on the 4F3/2–4I13/2 transition. A highest output power of 4.64 W was achieved at an emission wavelength of 1319 nm with a slope efficiency of 29.8% with respect to the absorbed pump power. Moreover, by adjusting the rotation angle of the BF, a cw simultaneous dual-wavelength Nd:YAG laser operating at 1353 and 1356 nm was also demonstrated for the first time. At an absorbed pump power of 17.8 W, the maximum output power obtained at 1353 nm and 1356 nm is 262 mW and 520 mW, respectively.
Experimental determination of differential scattering coefficients for nickel by means of linearly polarized x-ray radiation
Authors: Wählisch André , Wansleben Malte , Weser Jan , Stadelhoff Christian , Holfelder Ina , Kayser Yves , Beckhoff Burkhard 
Published: April 2023

Abstract
Performing an x-ray scattering analysis can underpin the quantitative description of a sample of interest, for example, to complement an x-ray fluorescence analysis. However, the reliability of such an analytical approach depends on good knowledge of scattering coefficients (or scattering cross-sections), which describe the probability of interaction and are characteristic of each chemical element. In this work, a metrological study of experimentally determining differential Rayleigh and Compton scattering coefficients for nickel is presented. Angular scans of the scattering intensities at different positions are enabled by a flexible experimental set-up and, therefore, allow for the robust determination of differential scattering coefficients at a wide range of forward and backward scattering angles. As a result, scattering coefficients in the range from

0.117
(
14
)
×

10

−
3

cm2 g−1 sr−1 to

33.7
(
39
)
×

10

−
3

cm2 g−1 sr−1 were determined in the momentum transfer range of 12.1 nm−1 to 22.4 nm−1. In addition, utilizing monochromatized and highly linearly polarized synchrotron radiation (

E
0

=
30

keV

) ensures direct comparability to theoretical databases.
Energetics of a microscopic Feynman ratchet
Authors: Cleuren Bart , Eichhorn Ralf 
Published: April 2023

Abstract
A general formalism is derived describing both dynamical and energetic properties of a microscopic Feynman ratchet. Work and heat flows are given as a series expansion in the thermodynamic forces, obtaining analytical expressions for the (non)linear response coefficients. Our results extend previously obtained expressions in the context of a chiral heat pump.
Preparation of Magnetic Graphene Photocatalytic Nano-adsorbent for the Sustainable Removal of Polycyclic Aromatic Hydrocarbons from Aqueous Solution
Authors: Ying Qi , Li Taiguang , Hao Yongmei 
Published: April 2023

Abstract
Magnetic graphene oxide-SiO2-TiO2 (MGST) composite was prepared for the absorption and further photodegradation of PAHs to reduce the risk of PAHs in the water environment. Magnetic graphene oxide (MGO) was obtained by introducing Fe3O4 to graphite oxide (GO). Furthermore, the suitable SiO2 layer was wrapped on the MGO for further modification with TiO2. Finally, the functional MGST composite with uniform morphology was obtained. Naphthalene, phenanthrene and pyrene were selected as models. It was found that the adsorption capacity of MGST showed the order of naphthalene (NAP) < phenanthrene (PHE) < pyrene (PYR).
Gallium Nitride Power Devices in Magnetically Coupled Resonant Wireless Power Transfer Systems
Authors: Di Kuo , Lu Bingcheng 
Published: April 2023

Abstract
The main function of power devices is to convert electrical energy through high-speed switching, such as AC/DC, high and low voltage conversion, etc. Therefore, the performance of the device directly affects the performance of the power electronic device, thereby further affecting the conversion efficiency of electrical energy. The arrival of the 5G era has greatly increased the demand for gallium nitride (GaN). The development of the wireless communication market has made GaN play a key role in many aspects of human activities. The main aim of this article is to research the application of GaN power devices in magnetically coupled resonant wireless power transfer (WPT) systems. This paper first introduces the related concepts of GaN power devices, magnetic coupling resonance and WPT, and analyzes the construction of magnetic coupling resonance WPT system in detail. Secondly, the energy transmission structure is analyzed, the system is designed and the system loss is calculated and analyzed. The system loss experiment shows that by using the output capacitor of the GaN device, the dead time is optimized, the conduction loss of the switch tube is reduced, the efficiency of the converter device is improved, and the practical application of the GaN device is provided.
Experimental Study on Axial Compression Performance of New-Type BFRP-Confined Square Concrete Columns
Authors: Shen Huijun , Chen Linsong , Zheng Hehui , Zhang Feng 
Published: April 2023

Abstract
For a new type of BFRP composite based on epoxy silicate resin, the confined influence on the concrete structure was studied by model experiment and theoretical analysis. The effects of wrapping form and layers on the behavior of the square concrete column was understood. The results showed the development trend of the loading curve of specimens confined by BFRP and CFRP is basically consistent, but the confined effect of BFRP is relatively poor. Under the two layers of full coverage, the axial compressive strength of the BFRP-confined groups and the CFRP-confined groups was increased by 28.45% and 64.73%, respectively. The existing codes have good applicability to CFRP specimens, but poor applicability to BFRP specimens. The calculation model proposed here can accurately describe the axial compression bearing capacity of new BFRP reinforced square concrete columns.
Experimental Evaluation of Thermoelectric Generator Performance under Different Heat Conduction Boundary Conditions
Authors: Wang Haitao , Fu Qiang 
Published: April 2023

Abstract
Heat conduction boundary conditions play a crucial role in the performance of thermoelectric generators (TEG). The TEG output voltage and power were measured under constant temperature boundary and heat flux conditions to evaluate the TEG performance under different heat conduction boundary conditions. External loading pressure and thermal interface material (TIM) were applied to reduce the interfacial thermal contact resistance. In our measurement setup, a fast-response electronic load was used for the rapid current-voltage scan, which can eliminate the thermal drift caused by the Peltier effect. A guard heater arrangement is used to minimize heat loss. In constant temperature boundary conditions, reducing the thermal contact resistance can increase the effective temperature drop across the TEG module and significantly improve the output voltage and power. But in the constant heat flux conditions, since the heat flux flow through the TEG is unchanged, the temperature drop across the TEG was unaffected by the thermal contact resistance. As a result, the TEG performance was lightly influenced by the thermal contact resistance.
Micro-fabrication Based Epidermal E-tattoo with Conformability and Sensitivity as Human-Machine Interface
Authors: Xie Ying , Liu Geng , Ren Jie , Liu Ying , Yao Liang , Xu Baochun , Chen Da , Liu Yijian 
Published: April 2023

Abstract
To fulfill intelligent human-machine interface, the crucial information about the human health condition tends to be acquired with great sensitivity, stability and durability. Despite some remarkable progress for the bioelectric signal perception in recent years, the epidermal electrode still suffers from the motion artifacts, inability and sweat permeability. So the evolution of high-performance epidermal electrode has been the research focus and receives much attention in recent years. To satisfy the growing pursuit for smarter sensing, this article proposes a cost-effective strategy to fabricate e-tattoo epidermal electrode for acquisition of the epidermal bioelectric signal and provides demonstrations of electrocardiograph and electromyography applications. The maximum current change is only 1.6% in the 3-dimensional strain electrical test, and the maximum strain range could reach 40% for a normal usage. The mechanism relies upon conformal contact between the electrode and skin texture with ultra-thin process scale, which makes the device achieves high sensitivity and durability in a human-machine interface. The gesture recognition and wearable device demonstration further concludes by discussing the outlook and current challenges of these technologies as a human-machine interface and bring up the potential of clinical application.
Research on Vibration of Escalator Handrail
Authors: Shen Wenhao 
Published: April 2023

Abstract
Escalator is an indispensable means of transportation in daily life. In the past, people often focused on the safety of escalators. However, with the continuous improvement of living standards, people have begun to pay attention to the ride quality of escalators. At present, the detection of passenger ride quality has become a very important topic. The ride quality of elevator can reflect the level of elevator design, installation and service quality. At present, the measurement methods and requirements for the ride quality of traction and forced drive elevators have been very clear. However, the research on escalator ride quality is less. It is urgent to propose a unified inspection method, judgment method and evaluation method, so as to make a scientific, standardized and objective evaluation of the ride quality of the escalator. This article researches upward and downward vibration of escalator handrail through experiment and data analysis. In the experiment, the vibration data of the handrail are collected and processed by the measuring instrument. It is concluded that the x-axis vibration of escalator handrail is the most likely to cause the passenger ride quality problem. if mass or standardized measurement of the ride quality of escalator handrail is required, the inspection method can be simplified, focusing on measuring the x-axis vibration of the handrail.
Study on Preparation and Performance of a Novel Indoor Purification Material
Authors: Xin Zinan , Shen Li , Wang Xingquan , Yang Lianwei 
Published: April 2023

Abstract
As known to all, the quality of indoor air directly affects people’s health. Although the existence of indoor air purification products has some purification functions, there are also a variety of shortcomings. For example, activated carbon can only physically adsorb formaldehyde and cannot decompose formaldehyde, which is easy to saturate and causes secondary pollution. Based on a Japanese patent, an air purification product reacts with formaldehyde to produce N-substituted imines. Meanwhile, the products are not small molecules such as water and carbon dioxide, thus the reaction is slow and cannot meet all of the people’s needs. In this paper, a novel kind of indoor purification material is studied, which is a kind of Nanoparticle with strong oxidizing properties, showing a good function in removing formaldehyde, toluene, and other harmful gases as well as sterilization. In addition, the purification performance has been verified and compared with that of activated carbon commonly used in the market and an air purification product based on a Japanese patent, in which the main components are organic amine and amide complex. A series of experimental results show that the adsorption efficiency and capacity of the new adsorption purification material developed in this paper are much higher than those in the market. The adsorption capacity is 1.80 times that of activated carbon, and 1.13 times that of a Japanese famous brand formaldehyde removal product; The adsorption rate of the new adsorption and purification material is two times that of activated carbon, and 1.56 times that of a Japanese famous brand formaldehyde removal product. Furthermore, the new adsorption purification material has a strong inhibitory effect on common bacteria. The active substances contained in the material oxidize common bacteria in the air. The antibacterial rate of representative Escherichia coli, Staphylococcus aureus, and Klebsiella pneumonia is greater than 99%, and the antibacterial rate of Candida albicans is 96.3%. In addition, it is non-toxic, low cost, and can well meet people’s purification needs.
Fracture Properties of Plastic-Steel Fiber High-Performance Concrete after High-Temperature Exposure
Authors: Zhao Teng , Du Hongxiu , Ding Mingdong , Wang Congcong 
Published: April 2023

Abstract
To study the fracture properties of plastic-steel fiber high-performance concrete at high temperatures, the load-mid-span displacement curve and load-opening displacement curve of plastic-steel fiber concrete were obtained through fracture test conducted before and after exposure to high temperature. By calculating the fracture parameters, fracture energy, and characteristic length of concrete, the relationship of fracture parameters, fracture energy, and characteristic length of concrete with temperature was comparatively analyzed against the experimental results obtained for plain concrete. According to the analytical results, the crack initiation load value, maximum load and crack initiation toughness of SFRC are significantly improved after high-temperature exposure, and the plastic-steel fiber reinforced concrete is effective in reducing the critical value of crack opening displacement for concrete. When the test temperature ranges from 200°C to 600°C, the anti-cracking effect of plastic-steel fiber on concrete is more significant relative to plain concrete. Given temperature rise, the plastic-steel fiber reinforced concrete shows decrease in brittleness but increase in toughness, with the level of fracture energy first increasing and then decreasing. Besides, there is only slight difference observed in characteristic length between plastic-steel fiber reinforced concrete and steel fiber reinforced concrete.
Influences of Different Isothermal Temperatures on Microstructural Evolution of Mg2Si/AZ91D Composite Fabricated by Semi-solid Treatment Process
Authors: Ma Guorui , Tang Chunchong , Wang Chunxia , Yang Yunqiu , Li Xuan 
Published: April 2023

Abstract
Due to the eutectic reaction, the Mg2Si phase is inclined to creating an unfavorable fishbone shape at low solidification rates. This can significantly degrade the mechanical characteristics and become the main barrier to the practical application of Mg2Si/AZ91D composites. It is regarded that semi-solid treatment process is an efficient technique to modulate the fishbone-shaped Mg2Si phases in Mg2Si/AZ91D composite. In this work, a new type of Mg2Si/AZ91D composite is successfully fabricated by semi-solid treatment process, and the influences of different isothermal temperatures on microstructural evolution of Mg2Si/AZ91D composite are studied. The findings illustrate that the mean size of the α-Mg grains increases and their trendency of spherification becomes more evidently after held for 30 min at different isothermal temperatures from 550° C to 580°C. Additionally, through semi-solid treatment process, the Mg2Si phases in Mg2Si/AZ91D composite are totally changed from their original fishbone shape into polygon or granule shapes. With increasing of the isothermal temperatures, the mean size and morphologies of Mg2Si phases have no significantly changes. The morphological change theory of Mg2Si phases in Mg2Si/AZ91D composite by semi-solid treatment process is also studied.
Study on the Kinetics of Shell Powder Intensified Drying Process of Sludge
Authors: Xu Chunming , Zhou Xiantao , Yang Tong , Liu Yizhi , Chen Yun 
Published: April 2023

Abstract
Based on the problems of large yield of sludge, low degree of shell resource utilization and large mass transfer resistance of sludge drying process in China, the drying characteristics and water migration rules of shell powder quenched sludge are studied in this paper. Single-factor and orthogonal experiments of drying temperature, thin layer thickness and mixing ratio are performed, and the results are fitted to the drying kinetics model. The results show that the drying process is best when the mixing ratio is 10:1; The degree of influence of each factor is: thin layer thickness > mixing ratio > drying temperature, the optimal process is: mixing ratio of 10:1, drying temperature of 160°C and thin layer thickness of 6 mm; The Midilli and Kucuk model in the kinetic analysis can better describe the water migration in the sludge. According to Fick’s second law and Arrhenius equation, the fitting equations of pure sludge and mixed sludge at 100° C -160°C and 6 mm are obtained, shell powder quenched sludge has greater effective diffusion coefficient and smaller activation energy than pure sludge, which shows that the addition of shell powder can optimize the drying process of sludge.
Preparation of Nano Ag Loaded Wood Filter Material and Its Catalytic Degradation of Dyes
Authors: Zhan Yuting , Liu Tong , Wang Te 
Published: April 2023

Abstract
Using porous light wood as raw material, Ag/wood composite filter material was prepared by loading metal Ag nano catalyst in wood matrix by in-situ reduction of silver ammonia solution. The catalytic degradation of organic pollutants in dye wastewater was realized by using the characteristics of high fluid transmission efficiency of wood and catalytic activity of silver nanoparticles. The morphology and structure of the material were characterized by scanning electron microscope, transmission electron microscope and X-ray diffraction, and the catalytic degradation of organic dye methylene blue by nano Ag loaded wood filter material was investigated. The results show that the prepared Ag/wood composite filter material retains the pore structure of wood, Ag nanoparticles are successfully loaded on the inner wall of the catheter and evenly distributed, and the particle size range is 5 nm-20 nm; The silver nanoparticles on the inner wall of the wood duct have good catalytic activity, and the wood filter material can effectively catalyze the degradation of methylene blue in water. Its degradation efficiency and water flux are closely related to the thickness of the filter material; The catalytic degradation efficiency of methylene blue by 6 mm thick filter material driven by gravity is 94.03%, and the water flux is up to 2600 L/(M2•h), which realizes the optimization of dye degradation efficiency and water flux. Nano Ag loaded wood filter material has the advantages of simple preparation process, low cost and large-scale. It has a good application prospect in the field of dye wastewater treatment.
Tentative Prediction of Harmful Algal Blooms in Yangtze Estuary
Authors: Zhang Xinfeng , Zhang Jian , Yuan Ying , Shangguan Wangzuo , Huang Ziqian , Zhang Shuo 
Published: April 2023

AbstractBy using spatial autoregressive models, this paper mainly studied the limited factors and spatio-temporal prediction of harmful algal blooms (HAB). The environmental factors of sea surface temperature (SST), dissolved organic matter (DOM) and suspended sediment concentration (SSC) were used to model the chlorophyll a (Cha) distribution and the occurrence of HAB. The results indicated that SST had no significant influence on the growth of phytoplankton in May and June, but higher SST in July and August decreased the frequency of occurrence of HAB. SSC was the main limited factor of HAB, and considerably and positively influenced the algal growth and HAB. HAB in Yangtze estuary was mainly caused by nutrients not DOM. The predicted spatial pattern in July 2010 was more dispersed than the actual clustered pattern. This clustered pattern should be driven by the combined impacts of coastal current, Taiwan Worm current and the northward seasonal.
Transfer of Polystyrene Microplastics with Different Functional Groups in the Aquatic Food Chain
Authors: Li Xuan , Sun Cuizhu , Li Fengmin 
Published: April 2023

Abstract
Microplastic pollution has become an increasingly concerning environmental problem because of its adverse impact on aquatic ecosystem security. Microplastics in the aquatic environment are poisonous to aquatic life, and they can not only be consumed by aquatic life but also pass down the food chain, endangering human health in the process. To investigate the accumulation and transfer of three different functional microplastics, including polystyrene (PS), carboxylate-modified polystyrene (PS-COOH), and amine-modified polystyrene (PS-NH2), in the aquatic food chain between Chlorella pyrenoidosa,Daphnia magna, and zebrafish, this study focused on three different functional microplastics. The maximum concentration of the three microplastics in Daphnia magna occurred at 8h, while that in zebrafish appeared at 24h. Three microplastics accumulated in the following order: PS-COOH > PS-NH2 > PS. The BMF of zebrafish intestine/Daphnia magna > 1, suggesting that biomagnification occurred along the food chain transfer and mainly accumulated in the intestine of zebrafish. This study confirmed the biomagnification of three polystyrene microplastics during food chain transfer, providing a theoretical basis for the transfer of microplastics in aquatic food chains.
Preparation and Cr (VI) Removal Performance of a New Positively Charged PVC Microfiltration Membrane
Authors: Hou Aixin , Han Jiao 
Published: April 2023

Abstract
Poly (vinyl chloride co dimethyl aminoethyl methacrylate) (PVD) and polyvinyl chloride (PVC) were blended, and then the tertiary amine groups of PVD in the casting solution were quaternized in situ with methyl iodide (CH3I) at 60. A new strongly charged positive PVC/PVD (M1) microfiltration membrane was prepared by non solvent induced phase transformation (NIPS), and PVC (M0) microfiltration membrane was prepared and compared with it. The membrane performance parameters such as morphology, pore size, charge, hydrophilicity and pure water flux of M0 and M1 were characterized. The cationic surfactant Octadecyltrimethylammonium chloride (STAC) micelle enhanced filtration was used to remove trace Cr6+(Cr2O7
2-) from the solution. The effects of Cr6+ concentration, pH value and sodium chloride (NaCl) concentration on the interception performance were investigated. The results show that the rejection rate of Cr6+ removal by M1 membrane micelle enhancement is close to 100%. When the mass ratio of Cr6+/STAC is greater than 0.478, the rejection rate of Cr6+ removal by M1 decreases with the increase of Cr6+ concentration; PH value has little effect on the retention of Cr6+ by M1; High concentration of NaCl reduced the rejection rate of Cr6+ by M1. M1 microfiltration membrane has potential development prospects in the treatment of wastewater containing Cr6+.