bluuebunny/crossref_metadata_2025_split huggingface dataset:
RSD measurements from BOSS galaxy power spectrum using the halo perturbation theory model
Authors: Yu Byeonghee , Seljak Uroš , Li Yin , Singh Sukhdeep 
Published: April 2023

Abstract
We present growth of structure constraints from the cosmological analysis of the power
spectrum multipoles of SDSS-III BOSS DR12 galaxies. We use the galaxy power spectrum model of [1], which decomposes the galaxies into halo mass bins, each of which is modeled
separately using the relations between halo biases and halo mass. The model combines Eulerian
perturbation theory and halo model calibrated on N-body simulations to model the halo
clustering. In this work, we also generate the covariance matrix by combining the analytic
disconnected part with the empirical connected part: we smooth the connected component by
selecting a few principal components and show that it achieves good agreement with the mock
covariance. Our analysis differs from recent analyses in that we constrain a single parameter
fσ
8 fixing everything else to Planck+BAO prior, thereby reducing the effects of prior
volume and mismodeling. We find tight constraints on fσ
8:
fσ
8(z
eff = 0.38) = 0.489 ± 0.038 and fσ
8(z
eff = 0.61) = 0.455 ±
0.028 at k
max = 0.2 hMpc-1, with an overall amplitude error of 5%, and in
good agreement (within 0.3 sigma) of Planck amplitude. We discuss the sensitivity of cosmological
parameter estimation to the choice of scale cuts, covariance matrix, and the inclusion of
hexadecapole P
4(k). We show that with k
max = 0.4 hMpc-1 the constraints
improve considerably to an overall 3.2% amplitude error, but there is some evidence of model
misspecification on MultiDark-PATCHY mocks. Choosing k
max consistently and reliably
remains the main challenge of RSD analysis methods.
Bouncing cosmology in VCDM
Authors: Ganz Alexander , Martens Paul , Mukohyama Shinji , Namba Ryo 
Published: April 2023

Abstract
We construct an asymmetric bouncing scenario within the VCDM model — also known as type-II minimally modified gravity, — a modified gravity theory with two local physical degrees of freedom. The scenario is exempt of any ghost or gradient instability, ad-hoc matching conditions or anisotropic stress issue (BKL instability). It moreover succeeds in generating the cosmological perturbations compatible with the observations. The scalar spectral index can be adapted by the choice of the equation of state of the matter sector and the form of the VCDM potential leading to an almost scale-invariant power spectrum. Satisfying the CMB bounds on the tensor-to-scalar ratio leads to a blue tensor spectrum.
Research on Star Sensor-based Space Debris Detection and Positioning Technology
Authors: Liu Meiying 
Published: April 2023

Abstract
As an important part of space situational awareness, space-based surveillance of space debris is of great significance for understanding and protecting space resources. With the increasing number of spacecraft operating in the Earth's orbit, both the environment and the space security situation have gradually deteriorated. The accurate detection of small, dim targets in space is the technical basis of space-based debris monitoring; however, several difficulties exist in this field. Since space targets reflect low light energy, the number of pixels occupied by the target is small, and they do not reveal shape or texture characteristics. Space debris is therefore easily confused with background stars, leading to many false alarm targets, and making source detection, recognition, and tracking challenging. Accurate source positions for small and dim space targets are therefore important motivators in our project. However, the positioning accuracy of existing space-based monitoring platforms is limited by the position of the observation platform and the observable time period, due to the high-speed movements of the satellite platform and the observation target. The observation efficiency of existing space-based monitoring platforms is also low, which has certain limitations in practical applications. The high-precision measurement of target positions is thus inhibited when using existing space-based monitoring platforms. The aim of this research is to use an autonomous recognition algorithm based on a compound calibration star grid pattern for star identification. This study utilized a national advanced research project from the National High Technology Research and Development Program and used a star sensor for space debris monitoring, allowing dim and small space debris to be distinguished from stars. This research proposes a target detection technology path based on local sky reference star image comparison to detect weak and small targets in the background of star images. This technology enables the rapid, effective recognition and high-precision positioning of small, dim space targets.
Antibacterial Properties and Mechanism of Graphene Oxide with Different C/O Ratio
Authors: Zhao Haoqi , Gu Baoshan , Yang Peiyan , Yi Jinquan , Lv Xudong 
Published: April 2023

Abstract
Graphene oxide (GO) has been extensively studied in biomedicine area on account of its great antibacterial activity. However, there are many factors that affect its antibacterial performance, and its mechanism of action is still unclear. In this paper, our modified Hummer method was used to prepare high-purity GO, and reduced graphene oxide (rGO) with different oxygen content was prepared by controlling different vacuum thermal reduction times. The impact of carbon-oxygen ratio on the antibacterial features of GO was studied. It is found that GO inactivates bacterial cells through oxidative stress, and the oxygen-containing groups also play a vital role.
Toughening Effect of Graphene Oxide in WC-Co Cemented Carbide
Authors: Gu Qingyi , Zhang Xiaoxiao , Zhang Jun , Zhai Chonglin 
Published: April 2023

Abstract
To study the effect of graphene oxide (GO) addition on the microstructure and mechanical properties of WC-Co cemented carbides, sintered bulks were fabricated and characterized. The study shows that the GO added in cemented carbide have insignificant effect on the relative density and the crystalline size, therefore, the higher hardness is maintained. Moreover, the fracture toughness has increased by 29.1%. Bridging is found to be the main toughening mechanism in WC-Co-GO cemented carbide. GO can be expected to be used to prepare cemented carbide with both high hardness and high fracture toughness.
First-Principles Study of Electronic Structure and Magnetic Properties of SnO2Co-doped with Transition Metals (Mo, Ru, Rh, and Pd) and Oxygen Vacancies (VO)
Authors: Liu Chenxi , Shi Leiqian , Pang Guowang , Pan Duoqiao , Liu Jibo , Ma Lei , Wang Xiaodong , Liu Lizhi , Lei Bocheng , Zhang Lili 
Published: April 2023

AbstractThe formation energies, electronic structures, and magnetic properties of a series of SnO2systems co-doped with transition metals (Mo, Ru, Rh, and Pd) and oxygen vacancies (VO) were investigated using plane-wave density functional theory with ultra-soft pseudopotentials. The results show that the formation energy of the Mo-VO-SnO2system was the smallest among the doped systems, indicating that the system was the easiest to form. The net magnetic moments of the X-VO-doped SnO2systems (X = Mo, Ru, and Rh) are not zero, indicating that the systems are all in the ferromagnetic state. Among them, the Mo-VO-doped SnO2system had an enormous net magnetic moment, highest spin polarization rate, and best ferromagnetism, making it an excellent ferromagnetic candidate material. The ferromagnetism of the doping systems originates from the strong hybridization of the 4d orbitals of the unpaired electrons in the dopants. The VO-SnO2does not exhibit any magnetic properties. Therefore, VOdoesn’t play a role in the generation of magnetism
Tm3+/Tb3+/Eu3+ tri-doped Na2O-BaO-B2O3-P2O5 Glass Material for White LEDs
Authors: Dong Xingui , Tang Jian , Tang Yongfeng , Qin Lina , Xing Junhao , Chen Guohua 
Published: April 2023

Abstract
The Tm3+/Tb3+/Eu3+ tri-doped borate glasses were fabricated by melt quenching method, and the structure, spectral characteristics and illuminant behaviors were characterized by XRD and fluorescence spectrophotometer. Through the measurement of photoluminescence spectrum and fluorescence decay lifetime, the fluorescence decay of Tm3+ at 452 nm and Tb3+ at 542 nm shows a faster trend, which confirms the energy conversion process of Tb3+→Eu3+ and Tm3+→Eu3+. The color temperature 5615.51K and color coordinate (0.3295, 0.3566) of the 0.5Tm3+/1.0Tb3+/0.5Eu3+ (mol%) tri-doped glass sample are close to the standard white light color temperature 5454.12K and its color coordinate (0.3333, 0.3333). It is expected that it will become a candidate material for white LED and light-emitting display, and has broad prospects.
Effect of SiO2 Adding on Properties of SiC Porous Ceramic Support
Authors: Xue Ridong , Yu Tianyi , Song Haibo , Sun Yanan , Deng Xiangyun 
Published: April 2023

Abstract
In this paper, The binders were prepared with different proportions of potassium feldspar, kaolin and quartz. In order to optimized the performance of SiC porous ceramics, the influence of binders with different content of SiO2 on the bending strength, filtration pressure drop and stomatal rate of porous ceramics were explored. The results show that doping of 10wt% SiO2 in the binder can improve the mechanics performances of SiC porous ceramics. Samples prepared by thermal insulation for 90 minutes at 1300°C had the best comprehensive performance when the adhesive contained 10wt% SiO2. At this time, the porosity was 25.52%, the bending strength was 47.15 MPa, and the filtration pressure drop was comparatively low.
Microstructures and Properties of TiSiN/TaVN Nanomultilayers with Various V Contents
Authors: Yan Hongjuan , Mi Zhifeng , Li Chunyang , Liu Yifeng , Liu Fengbin , Si Lina 
Published: April 2023

Abstract
The purpose of this study was to optimize V content of TiSiN/TaVN nanomultilayers. TiSiN/TaVN nanomultilayers with various V contents were deposited on 304 stainless steels and Si wafers. The structures and properties of TiSiN/TaVN nanomultilayers were analyzed and characterized. The results show that TiSiN/TaVN nanomultilayers exhibit the face-centered cubic (FCC) structure and preferred orientation on the (111) and (200) planes. With the increasing of V contents, the diffraction peaks of TiSiN/TaVN nanomultilayers were shifted to larger angles. Paralleling to the growth direction of TiSiN/TaVN nanomultilayers, an alternating stress fields are generated to enhance their strength. The hardness and elastic modulus of the nanomultilayers firstly increases and then decreases and friction coefficient firstly decreases and then increases with increasing of V contents. TiSiN/TaVN nanomultilayer with 15 at.% V content indicates the maximum hardness of 27.23GPa, the maximum elastic modulus of 280.96GPa and the highest resistance against plastic deformation. TiSiN/TaVN nanomultilayer with 15 at.% V content has minimum friction coefficient of 0.16 because Magnéli phase oxide V2O5 is formed during the reciprocating sliding friction process and H3/E2 of TiSiN/TaVN nanomultilayer with 15at.% V content is highest.
Safety Study Based on the Aging Mechanism of Retired Lithium Batteries
Authors: Zhang Taiyang , Shi Qian , Huang Xian’an , Zhang Chijian 
Published: April 2023

Abstract
Aiming at the problem of battery aging and capacity change during the charging and discharging cycle of decommissioned ternary lithium batteries, it is proposed to study lithium batteries from two different perspectives: macro and micro. Select the appropriate external characteristic parameters to carry out a large number of charge and discharge cycle experiments with different magnifications for the decommissioned ternary lithium battery, and observe the capacity and internal resistance of the lithium battery from a macroscopic perspective. For the battery disassembly experiment, the angle analyzes the changes in the internal material of the battery. The results show that the experimental verification of decommissioned lithium batteries can accurately analyze the reasons affecting battery aging and capacity change, so as to reduce the safety hazards of cascade use of batteries and extend the service life of batteries to provide data guidance and suggestions.
Preparation and Ferroelectric Properties of Ba(1-x-y)CaxSryTiO3 Nanotubes
Authors: Song Haibo , Sun Yanan , Xue Ridong , Yu Tianyi , Deng Xiangyun 
Published: April 2023

Abstract
In this paper, Ba(1-x-y)CaxSryTiO3 nanotubes with different doping concentrations were prepared by hydrothermal synthesis, and then their micro morphology, crystal structure, and ferroelectric properties were analyzed by SU8010 scanning electron microscope, D/MAX-2500 X-ray diffraction tester, and TF2000. It is found that the barium titanate nanotubes co doped with Ca and Sr have obvious tubular structure. With the increase of doping concentration, the nanotube diameter becomes smaller, the tube wall becomes thicker, and the ferroelectric properties of the samples increase first and then decrease. When 0.002mol/L Ca(CH3COO)2 and 0.002mol/L Sr(CH3COO)2 are doped, the maximum residual polarization intensity of Ba(1-x-y)CaxSryTiO3 is 0.097µC/cm2. At this time, there is a clear hysteresis loop image, and the ferroelectric performance is the best.
Study on V2O5 Nanoribbon Electrode Material
Authors: Wang Xinwei , Zhai Xuejie , Jiao Yanxia , Lv Pai , Wang Shunhua , Chi Junhong 
Published: April 2023

Abstract
V2O5 nanoribbon prepared by simple hydrothermal method has uniform dispersion and smooth surface. The width of nanoribbon is about 50 nm, the thickness is about 20 nm, and the length varies from 100 nm to 200 nm to 10 μm. By researching the electrochemical performance of V2O5 nanoribbon and exploring the influence of the type and concentration of electrolyte on the electrochemical performance, it is found that the electrochemical performance of V2O5 nanoribbon is the best in 0.5 mol·L−1 LiNO3 solution, and the specific capacitance of the material is 370 F·g−1(0.5 A·g−1).
Latest Progress of Mechanical Properties of Geopolymer Concrete at Elevated Temperature
Authors: Zhu Lina , Zha Xiaoxiong 
Published: April 2023

Abstract
In order to alleviate the environmental pollution and energy consumption problems caused by ordinary Portland cement, geopolymer came into being as a new type of green building material. The special three-dimensional mesh structure of geopolymer concrete makes it show excellent durability under fire, so it has been deeply studied by many scholars. This paper mainly expounds the research results of the basic static properties of inorganic geopolymer concrete at high temperature from the following four aspects: compressive strength, tensile strength, modulus of elasticity and stress-strain relationship. Due to the obvious differences in the mechanical and structural properties of geopolymer concrete in terms of raw materials, mix ratio, curing temperature, etc. There is no corresponding material and structural design specification for geopolymer concrete and it needs more incisive research before it applies to engineering construction.
Optimization Method of Acoustic Filter Structures Composed of Helmholtz Resonators Based on Genetic Algorithm
Authors: Lv Chenghao , Wang Xiaoming , Mei Yulin 
Published: April 2023

Abstract
This paper constructs an iteration method based on Genetic Algorithm to optimize the acoustic filter structure comprising Helmholtz resonators, providing a new approach to optimize the low-frequency filtering performance of the acoustic structure under the constraint of keeping the resonator volume unchanged. First, acoustic-electrical analogy is used to design a fifth-order Chebyshev type II acoustic filter structure, which comprises two rectangular Helmholtz resonators; second, an iteration method is constructed based on Genetic Algorithm to optimize the shape of Helmholtz resonator under the constraint of keeping the resonator volume unchanged; finally, an optimal acoustic filter structure is obtained by implementing the iteration procedure to design shapes of the two Helmholtz resonators. The simulation results show that, compared with the original rectangular Helmholtz resonator, the optimal Helmholtz resonator has a reduction of about 10% in the resonant frequency and an obvious shift of the transmission loss curve towards low frequencies; the optimal acoustic filter structure has an effective attenuation frequency range of 84-232Hz, showing a significantly improved low-frequency filtering performance, verifying feasibility and effectiveness of the iteration optimization based on Genetic Algorithm.
Fluorescence Characteristics Analysis of Rodamine B
Authors: Ma Yongzhong 
Published: April 2023

Abstract
In this paper, the fluorescence characteristics of rodamine B essence under different concentration, different solvent, different PH and different excitation time were studied, and the influence of these factors on the fluorescence spectrum of rodamine B essence was analyzed. The results showed that when the concentration of basic rose essence was less than 1×10-4g/L, the fluorescence intensity was positively correlated with the concentration. When the concentration of basic rose essence was greater than 4×10-3g/L, the fluorescence intensity increased first and then decreased with the increase of basic rose essence. When the dielectric constant of the solvent increases, the fluorescence intensity of the solution increases. When PH is 1 ~ 2, the fluorescence intensity increases gradually. At 3, the fluorescence intensity remained unchanged.
Study on Factors Affecting the Compressive and Flexural Strength of the Geopolymer Paste using the Wet Mixing Method
Authors: Wang Kai , Chen Dejing , Gao Yuting 
Published: April 2023

Abstract
The paper investigates the 28 days compressive & flexural strength of the fifty-seven geopolymer paste specimens using the wet mixing method. The completely decomposed granite (CDG), combined with the slag were chosen as the sources of silicon and aluminum components. Types of the alkali solutions, the slag content, modulus and concentration of the alkali solutions, along with the liquid-solid ratio, were chosen as the variables. Influences of the parameters on the mechanical behavior of the geopolymer paste are discussed in the paper.
Study on Crack Resistance of C35 Limestone Powder Concrete
Authors: Wang Yige , He Tao , Rong Guocheng , Song Putao , Xia Jingliang , Leng Faguang 
Published: April 2023

Abstract
C35 pier concrete was prepared with natural limestone powder and fly ash, and the effect of the proportion of limestone powder and fly ash on hydration heat of composite cementitious material system was studied At the same time, the effects of different proportions of natural limestone powder and fly ash on adiabatic temperature rise, early shrinkage, drying shrinkage and early cracking of concrete were studied. The results show that the hydration heat of composite cementitious material system can be reduced by adding natural limestone powder and fly ash, the early shrinkage and dry shrinkage of concrete can be reduced, and the cracking of concrete can be reduced. On the contrary, when natural limestone powder and fly ash replace cement by 20%, 10% mass ratio, C35 concrete has the best indexes and better crack resistance.
Recrystallization Behavior of Specially Oriented Grains during Dynamic Softening of Powder Superalloys
Authors: Zhang Mincong , Li Kai , HaiLin  
Published: April 2023

Abstract
By analyzing the degree of grain deformation of FGH96 alloy under different plastic deformation process parameters, as well as the relative frequency and distribution characteristics of recrystallized core and grain boundaries with different orientation differences, comprehensively considering the evolution law of grains of different sizes, the relationship between grain boundary characteristics and grain boundaries is studied. The correlation and evolution law between the nucleation mechanism of recrystallized grains, the growth characteristics of recrystallized cores, and related dynamic softening mechanisms, combined with the change trend of grain orientation during deformation, for the special orientation grains generated during deformation. Granules and their recrystallization behavior characteristics were analyzed.
Chlorine Induced In-Situ Growth of TiO2 Nanoparticles on PVC Nano Fibers
Authors: Peng Wei , Wo Zihao , Shi Chaofan , Ma Hua , Su Yier , Zhou Dongshan , Zhang Xiwen 
Published: April 2023

Abstract
PVC-TiO2-DBD nanocomposites were synthesized via combined approaches of electrospinning, H2 plasma treatment and hydrothermal reaction. The spinning solution composition and the amount of PVC were investigated and optimized in order to obtain membranes with uniform structure and high chemical activity. It was found that TiO2 NPs were distributed homogeneously on the surface of the PVC fibers. Chemical bonds such as Ti-Cl and C-O-Ti bonds were formed to tightly immobilize the TiO2 NPs on the PVC surface. The effect of H2 plasma treatment on the surface of the PVC membranes was studied. Meanwhile, using ABS and PS as substrates, the influence of various groups, including chlorine bonds, C=C double bonds, cyano and phenyl groups on the possible promotion mechanism of different chemical bonds for the TiO2 deposition was also studied. Possible mechanisms for the enhancement of the deposition of TiO2 were given.
Preparation of Photoresponsive Nanosilica Powder
Authors: Qiu Xirong , Yan Xiaowei , Wang Zhimin , Zhang Cuimin , Sun Leyi , Bai Shengxin , Liu Zhimin , Xu Anhou 
Published: April 2023

Abstract
In order to obtain photoresponsive silicon dioxide nanopowders, fluoropolymer/SiO2 composite microspheres were prepared with a thiol-terminated fluoropolymer and with SiO2 microspheres grafted by acrylate via the thiol-ene click reaction; then, photoresponsive SiO2 nanopowders were synthesized by grafting azobenzene monomers on the surface of the SiO2 composite microspheres by esterification. The fluoropolymer and SiO2 composite microspheres were characterized via proton nuclear magnetic resonance, scanning electron microscopy, contact angle tests, dynamic light scattering, and UV-Vis absorption spectroscopy. The surface of the coating prepared using SiO2 nanopowders exhibited a high contact angle up to 130.9°. When the surface was irradiated with UV light, the contact angle decreased to 104.1°. Reversible changes in the surface wettability could be realized under the alternate irradiation of ultraviolet and visible light, thus achieving excellent photoresponsiveness.
High-entropy (Oxy)hydroxide Prepared by Electrodeposition for Highly Efficient OER in Alkaline Medium
Authors: He Lixiang , Wang Ni , Hu Wencheng 
Published: April 2023

AbstractWith the development of the economy and society, energy shortage and environmental pollution are increasingly in the spotlight. Electrolytic water to hydrogen technology is considered to be the best way to produce green hydrogen. However, the slow thermodynamic/kinetic limitations make it difficult to scale application due to an anodic oxygen evolution reaction (OER) involving four electrons. Recently, transition metal-based materials become popular research subjects because properties of abundant reserve and low cost. Fortunately, the performances for water splitting are surprising compared to some noble metal-based materials which means these materials have huge potential for practical application in reality. The transition metal (oxy)hydroxides are confirmed to be a category of promising electrocatalysts for OER. To improve the activity of catalysts, many effective strategies (including defects engineering, vacancy engineering, interface engineering, high-entropy effect, etc.) are adopted to modulate the electronic structure and enrich active site density. In this work, we have successfully synthesized high-entropy transition metal (oxy)hydroxides by one-step electrodeposition for water oxidation. The results obtained confirmed the high-entropy effect results in high intrinsic activity and high stability for electrochemical water oxidation.