bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exploring the influence of powder particles in dielectric liquid of EDM: pulse train, discharge energy, material removal rate and surface topography
Authors: Rajesh Jonnalagadda Venkata , Giridharan Abimannan 
Published: August 2023

Abstract
A comparative study on the effect of adding molybdenum di-sulphide (MoS2) powders of diameters 40 μm, 90 nm size into an ultrasonic vibration induced dielectric liquid of electrical discharge machining (EDM) process is attempted. Discharge duration, peak current, gap voltage are selected as input variables and their impact is assessed using pulse train, discharge energy, material removal rate (MRR) and surface integrity which are considered as outcome measure. The outcome measures of powder mixed dielectric (PMD) are compared with that of pure dielectric. Through pulse trains, a new phenomenon of partial discharge is identified. The incidence of partial discharge are assessed using scanning electron microscope (SEM) images. By varying the discharge duration, peak current and gap voltage, the discharge energy reduces in contrast to pure dielectric by 4%, 21.01%, 8.35% respectively for 40 μm diameter PMD and 10%, 27.29%, 17.99% respectively for 90 nm diameter PMD. The increase of peak current and gap voltage magnitudes cause the discharge energy to rise whereas discharge energy drops with growing magnitudes of discharge duration. Compared to the pure dielectric, the PMD produced enhanced MRR for similar discharge energy levels. The peak current has shown greater influence on MRR than discharge duration and gap voltage. In comparison with pure dielectric, the machining performance has improved by 21% for 40 μm diameter PMD, whereas 84.21% for 90 nm diameter PMD. At higher discharge parameters, better surface topography is produced in PMD than pure dielectric.
Analyzing the cosmic web environment in the vicinity of grand-design and flocculent spirals with local geometric index
Authors: Sarkar Suman , Narayanan Ganesh , Banerjee Arunima 
Published: August 2023

Abstract
We explore the environment of a combined set of 367 grand-design and 619 flocculent spiral galaxies. We introduce a novel estimator called the local geometric index to quantify the morphology of the local environment of these 986 spirals. The local geometric index allows us to classify the environment of galaxies into voids, sheets, filaments, and clusters. We find that grand-designs are mostly located in dense environments like clusters and filaments (∼ 78%), whereas the fraction of the flocculents lying in sparse environments like voids and sheets is significantly higher (> 10%) than that of the grand-designs. A p-value < 10-3 from a Kolmogorov-Smirnov test indicates that our results are statistically significant at 99.9% confidence level. Further, we note that dense environments with large tidal flows are dominated by the grand-designs. On the other hand, low-density environments such as sheets and voids favor the growth of flocculents.
How to detect lensing rotation
Authors: Robertson Mathew , Lewis Antony 
Published: August 2023

Abstract
Gravitational lensing rotation of images is predicted to be negligible at linear order in density perturbations, but can be produced by the post-Born lens-lens coupling at second order. This rotation is somewhat enhanced for Cosmic Microwave Background (CMB) lensing due to the large source path length, but remains small and very challenging to detect directly by CMB lensing reconstruction alone.
We show the rotation may be detectable at high significance as a cross-correlation signal between the curl reconstructed with Simons Observatory (SO) or CMB-S4 data, and a template constructed from quadratic combinations of large-scale structure (LSS) tracers.
Equivalently, the lensing rotation-tracer-tracer bispectrum can also be detected, where LSS tracers considered include the CMB lensing convergence, galaxy density, and the Cosmic Infrared Background (CIB), or optimal combinations thereof.
We forecast that an optimal combination of these tracers can probe post-Born rotation at the level of 5.7σ–6.1σ with SO and 13.6σ–14.7σ for CMB-S4, depending on whether standard quadratic estimators or maximum a posteriori iterative methods are deployed. We also show possible improvement up to 21.3σ using a CMB-S4 deep patch observation with polarization-only iterative lensing reconstruction.
However, these cross-correlation signals have non-zero bias because the rotation template is quadratic in the tracers, and exists even if the lensing is rotation free. We estimate this bias analytically, and test it using simple null-hypothesis simulations to confirm that the bias remains subdominant to the rotation signal of interest. Detection and then measurement of the lensing rotation cross-spectrum is therefore a realistic target for future observations.
Constraining Horndeski theory with gravitational waves from coalescing binaries
Authors: Quartin Miguel , Tsujikawa Shinji , Amendola Luca , Sturani Riccardo 
Published: August 2023

Abstract
In the broad subclass of Horndeski theories with a luminal speed of gravitational waves,
we derive gravitational waveforms emitted from a compact binary by considering the wave
propagation on a spatially flat cosmological background. A scalar field nonminimally coupled to
gravity gives rise to hairy neutron star (NS) solutions with a nonvanishing scalar charge, whereas
black holes (BHs) do not have scalar hairs in such theories. A binary system containing at least
one hairy neutron star modifies the gravitational waveforms in comparison to those of the BH-BH
binary. Using the tensor gravitational waveforms, we forecast the constraints on a parameter
characterizing the difference of scalar charges of NS-BH or NS-NS binaries for Advanced LIGO and
Einstein Telescope. We illustrate how these constraints depend on redshift and signal-to-noise
ratio, and on different possible priors. We show that in any case it is possible to constrain the
scalar charge precisely, so that some scalarized NS solutions known in the literature can
be excluded.
Constraints on compensated isocurvature perturbations from BOSS DR12 galaxy data
Authors: Barreira Alexandre 
Published: August 2023

Abstract
We use the BOSS DR12 galaxy power spectrum to constrain compensated isocurvature perturbations (CIP), which are opposite-sign primordial baryon and dark matter perturbations that leave the total matter density unchanged. Long-wavelength CIP σ(x) enter the galaxy density contrast as δg
(x) ⊃ bσσ(x), with bσ
the linear CIP galaxy bias parameter. We parameterize the CIP spectra as Pσσ
= A
2
Pℛℛ
and Pσℛ
= ξ√PσσPℛℛ
, where A is the CIP amplitude and ξ is the correlation with the curvature perturbations ℛ. We find a significance of detection of Ab
σ ≠ 0 of 1.8σ for correlated CIP (ξ = 1), consistent with no detection. For uncorrelated CIP (ξ = 0), the constraints are instead more significantly shifted away from zero, although this may be due to large-scale data systematics which have a bigger impact on these type of CIP. The constraints on A depend on the assumed priors for the bσ
parameter, which we estimate using separate universe simulations. Assuming bσ
values representative of all halos we find σA
= 145 for correlated CIP and σ
|A| = 475 for uncorrelated CIP. Our strongest uncorrelated CIP constraint is for bσ
representative of the 33% most concentrated halos, σ
|A| = 197, which is better than the current CMB bounds |A| ≲ 360. We also discuss the impact of the local primordial non-Gaussianity parameter f
NL in CIP constraints. Our results demonstrate the power of galaxy data to place tight constraints on CIP, and motivate works to understand better the impact of data systematics, as well as to determine theory priors for bσ
.
Laser ablation microsampling of copper phthalocyanine blue by the second-harmonic radiation of Nd:YAG laser
Authors: Balakhnina I A , Zagladin A A , Yu Chikishev A , Brandt N N 
Published: August 2023

Abstract
An original nonlinear optical method employing laser ablation with single nanosecond laser pulses at a wavelength of λ = 532 nm is used to study organic paint layer (copper phthalocyanine blue (PB15)). Two processes (photochemical reaction and formation of craters), which appear to be nonlinear result from the pulsed radiation. It is shown that the nonlinear optical procedure (laser ablation microsampling (LAMS)) can be used to obtain microparticles of PB15 sufficient for the further analysis. The Raman spectra of the surface of the paint layer prior to and after LAMS and microparticles are obtained. Spectral data, including those in the low-frequency region, are discussed.
Cryogenic slab RF discharge CO laser with hybrid waveguide-unstable resonators
Authors: Ionin A A , Kozlov A Y , Rulev O A , Sinitsyn D V 
Published: August 2023

Abstract
Dependences of a cryogenic slab radio-frequency discharge CO laser output power on a distance between mirrors of a hybrid negative-branch waveguide-unstable resonator were experimentally studied. The maximum output power was observed at the resonator length longer than the one calculated by taking into account the mirrors radii of curvature. Optimization of the resonator length made it possible to get the output power increase up to 20%–25%. The results obtained can be used for designing not only slab laser systems with hybrid waveguide-unstable resonators, but also for high-power lasers with full-sized negative-branch unstable ones.
Preparation of large-scale uniformly crystallized ITO thin films by rapid infrared annealing technique
Authors: Li Jiaming , Jiang Liangbao , Luo Junjie , Li Xiaoyu , Liu Jiaxi , Wang Minbo , Yan Yue 
Published: August 2023

Abstract
This paper proposes three engineering application technology applications for rapid infrared annealing (RIA): scanning annealing, lamp array preheating and scanning annealing, and lamp array annealing. For the dynamic scanning annealing method, the influence of the working distance from the infrared lamp to the amorphous indium tin oxide (ITO) film and the scanning speed on the heating of the film surface were studied. For lamp array preheating and scanning annealing, the attenuation of the compressive stress on the surface of the chemically strengthened glass under the condition of low temperature and the long holding time were revealed. For lamp array annealing, the influence of this technology on the optical and electrical properties of the ITO film and the surface compressive stress of chemically strengthened glass were studied. Using the lamp array preheating and scanning annealing and lamp array annealing technology, not only a crystalline ITO film with excellent optical and electrical properties and uniformity can be prepared quickly, but also the impact of the crystallization process on chemically strengthened glass can be reduced greatly.
Black Phosphorus Nanosheets: Synthesis and Biomedical Applications
Authors: Zhao Hanjun 
Published: August 2023

Abstract
Since 2014, black phosphorus (BP) has gained more and more attention because of its unique physicochemical properties. In particular, with unique electrical, optical, and biodegradable performances, BP may serve as an alternative for other two-dimensional nanomaterials (2DNMs) in biomedical applications. However, the practical application of BP in the biomedical field still faces great challenges. In this article, we focus on the various synthesis methods of BP, including the exfoliation method, chemical vapor deposition (CVD) method, and wet-chemical self-assembly method, and recent advances of BP in biomedical fields, such as biosensing, imaging, drug delivery, phototherapy, and bioactive phospho-therapy are highlighted. Finally, the current challenges of BP in biomedical applications are briefly discussed. It is believed that this article will provide effective scientific support for the development and application of BP.
Fatigue Performance Analysis of Adhesive-bonded Composite Joints Considering Size Effect
Authors: Liang Jinlong , Tu Liang , Shao Zhenjiang , Tang Ruizhi 
Published: August 2023

Abstract
Adhesive bonding failure is one of the main failure modes threatening the safety of the wind turbine blade (WTB), which drives fatigue performance analysis of adhesive bonding becoming a vital issue. Attributed to the high cost and sample scarcity of full-scale structural testing of WTBs, fatigue analysis of adhesive-bonded composite joints becomes a critical way to investigate the bonding properties. Adhesive bonding distributes in WTB with different sizes; thus, the fatigue performance in different place have a large difference. The existing researches mainly perform fatigue properties studies on the standard specimens, while the effects of bonding size on structural fatigue properties are ignored. With these concerns, a finite element method based on Cyclic Cohesive Zone Model theory is proposed, and size effects on fatigue properties are studied for adhesive-bonded composite joints in this paper. The results can be used for fatigue performance analysis for WTB adhesive bonding.
Microstructure evolution and homogenization parameters optimization of Al-3Cu-1Li-xMg alloys
Authors: Xun Chenyang , Li Xiwu , Li Huiyu , Geng Libo , Chen Pengcheng 
Published: August 2023

Abstract
An ideal homogenization parameter is essential to achieve outstanding final performances from Al-Cu-Li alloys. In this current study, scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and differential scanning calorimetry (DSC) techniques were used to examine the evolution of the microstructure of Al-3Cu-1Li-xMg alloys at the homogenization process, where x=0.86 wt.% (Alloy 1#) and x=0.42 wt.% (Alloy 2#). The outcome demonstrates that Ag-containing AlCuMg phases dominated Alloy 1# in its as-cast state. In contrast, Alloy 2# contained more block-like Al2Cu phases. Moreover, the area of the major endotherm peak of the DSC graph increased by 40% in Alloy 1# compared to Alloy 2# due to the addition of Mg concentration. This increases the difficulty of dissolving the soluble in subsequent stages. 495°C/16h+515°C/8h was the optimal homogenization treatment for Alloy 1#, while 495°C/16h was optimal for Alloy 2#. This finding is a benchmark for research on the impact of Mg concentrations on the formation and dissolution of eutectic phases in Al-3Cu-1Li alloys.
The Effect of PH Value on Shear Thickening and Chemical Compound Effect Polishing Solution
Authors: Tang Cheng , Huang Zhifu , Tang Lianyao , Yang Hui , Wang Yage 
Published: August 2023

Abstract
When the traditional polishing method is used to process brittle materials such as lithium niobate, brittle failure is easy to occur, and many microcracks remain on the surface of the workpiece. Thus, the traditional method is not suitable for ultra-precision machining with higher surface roughness requirements. In this paper, a new type of high-performance polishing fluid with shear thickening and chemical compound effect was developed. The shear thickening effect was combined with the chemical effect, which was dedicated to the ultra-precision polishing of difficult-to-machine materials, such as optical crystals and semiconductors. The results show that the best polishing effect is achieved when the pH value is 9.5.
Mechanical Properties of Iron Plating Layer after Nitriding
Authors: Fu Yuzhu 
Published: August 2023

Abstract
A certain thickness of the iron plating layer without impurities was fabricated on the surface of pure iron by employing electroplating treatment. The thickness of the iron plating layer was measured by approximately 23 μm. SEM studies demonstrated the microstructure of the surface of the iron plating layer before and after nitriding. According to XRD analysis, the compound layer was mostly composed of Fe2-3N with high supersaturation of nitrogen. After nitriding, the microhardness of the sample was 555 HV with the depth of the matrix at 30 μm, which was four times the hardness of the matrix. Under the same experimental conditions, the wear volume loss and friction coefficient of the nitrided iron plating layer was lower, showing that nitriding can significantly improve the poor wear resistance of the iron plating layer. The Salt spray corrosion experiment showed that nitriding can significantly improve the corrosion resistance of the iron plating layer.
Study on Effects of Geometric Parameters on Tensile Strength of Hybrid Bonded-Rived Joint of Fiber Reinforced Polymer Plates
Authors: Wang Di , Qu Liyuan , Wang Tianyuanye , Zhan Fei , Du Guangchao , Zhao Lin , Wang Haibo , Chang Zongyu 
Published: August 2023

Abstract
Hybrid bonded-rived joint combines bonding and riveting and has become one of the most important connection forms in composite materials. This paper investigates and analyzes the influence of geometric parameters of CFRP hybrid bonded-rived joints on load-bearing strength. The finite element method is used to analyze the strength of the hybrid bonded/riveted joint between carbon fiber composite and metal under tensile load. The different ratios of the hybrid joint’s e/D, w/D, and w/e are analyzed. It is shown that e/D and w/D significantly impact damage loads and failure mode of the hybrid bonded/riveted joint. The increase of e/D will change the joint from shear-out to net tension failure, and the effect of w/D is opposite to that of e/D. Under the same bonding area, different w/e impacts the damage load of the joint, and the larger w/e makes the joint have a larger failure load, and the stiffness of the joint is also large.
Forming pressure of PMI foam sandwich structure
Authors: Lin Zhengjie , Liang Hengliang , Zhou Hongfei 
Published: August 2023

Abstract
In this study, the performance of A-reinforced sandwich structures made with polymethacrylimide (PMI) foam material is explored. The research focuses on comparing two forming methods, bonding and co-curing. It also tests the static properties of sandwich test pieces under different forming pressures. It reveals that the foam sandwich structure formed under the 0.15 MPa bonding process outperforms the rest regarding static properties. These findings provide valuable insights into the optimal structure-forming process for PMI foam sandwiches, paving the way for future advancements in this field.
Structural Stability of Tailwater Penstock in Xiamen Pumped Storage Power Station
Authors: Li Gaohui , Yang Shaojia 
Published: August 2023

Abstract
To study the external water pressure that can be borne by the steel lining of the tailwater penstock of a pumped storage power station, the optimization of the steel lining shape provides the basis for ensuring its normal operation. In this paper, based on the finite element method and finite element analysis software ABAQUS, the calculation and analysis model of different stiffening ring schemes for tailrace penstock is established, structural stability is calculated and the influence of different stiffening schemes is compared and analyzed. The results show that the structural stability can meet the requirements of the code by setting the T-shaped stiffening ring and longitudinal stiffening rib. With the addition of longitudinal stiffeners, the steel lining tends to the stress characteristics of the two-way slab, and the overall stress deformation tends to be balanced, which can improve the external pressure resistance of the steel lining in the gradual change section to a certain extent.
Study of Large-area Flexible Transistor Array Fabrication
Authors: Chen Zengbian 
Published: August 2023

Abstract
In recent years, the rapid preparation of transistor devices and the control of manufacturing costs have been the focus of researchers. Conventional transistor semiconductor films are usually applied by spin coating or magnetron sputtering. However, the spin coating method tends to cause material waste. Based on this, a method of screen printing semiconductor layers is proposed. In this paper, P3HT ink was obtained by dissolving a mixture of P3HT and ethyl cellulose in a toluene solution. The screen printing technique was used to successfully obtain the semiconductor layer, which in turn successfully printed the transistor array. The dielectric layer is the screen-printed ionic gel and the electrode is vaporized gold electrode, resulting in a 100% success rate of transistors. The operating performance of the device is more stable than that of the spin-coating method, and the switching ratio of the obtained device is stable above 104 when the gate voltage is -3–3 V, -4–4 V, and -5–5 V, respectively. This approach offers a new way of thinking about flexible printed electronics.
Design and analysis of the thermal-insulation panel for the test section of the environmental wind tunnel
Authors: Yu Zebin , Cai Qingqing , Liu Qingnian , Wan Wen 
Published: August 2023

Abstract
Thermal-insulation panels are an important part of the test section for the environmental wind tunnel, which has the function of ensuring uniform airflow temperature and reducing heat loss. Considering many factors such as temperature, humidity, and pressure, it is determined that the average heat dissipation rate of the insulation panel’s outer surface temperature is less than 20 W/m2. The temperature difference between the outer surface of the insulation layer and the environment is not more than 10°C when the airflow temperature inside the test section reaches 95 °C. There is no condensation on the insulation layer when the airflow temperature inside the test section is -10 °C. By comparing various schemes, a phenolic foam was selected as the thermal-insulation material, and process measures such as liquid raw material mixing foaming and special equipment were adopted to complete the fabrication of the panels, and a composite assembly method was adopted to build panels in the test section. The results show that the thermal-insulation panel’s structure is conformed to the requirements of wind-tunnel operation and heat loss, which provides an important basis for reference for the construction of relevant test equipment.
Wear and Life of K40 Carbide Tool for Plunge Milling GH4169
Authors: Chen Hao , Chen Zhuo , Li Lei 
Published: August 2023

Abstract
In order to solve the problems of serious tool wear and poor durability during plunge milling of nickel base superalloy GH4169, the design test obtains the wear morphology process of the tool through K40 carbide tool insertion and milling GH4169. The experiment analyzed the impact and sensitivity of cutting parameters on tool life. The experiment and analysis show that when the K40 carbide tool is the plunge milling GH4169, the service life of the tool decreases rapidly with the increase of cutting speed, feed rate per tooth, and radial cutting depth; The tool life is most sensitive to changes in cutting speed, followed by the feed rate per tooth, and least sensitive to radial cutting depth.