bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electrostatic spraying preparation of Si/NiF2/PVDF energetic composites and their reaction characteristics
Authors: Mao Huiqing , Cui Rui , Zhang Xiandie , Ji Jie , Zhou Xiang 
Published: July 2023

Abstract
Metastable intermolecular composites are widely used in energy-demanding fields, where metal fluorides/fluoropolymers as oxidants have been a hot research topic in recent years. In this study, Si/NiF2/PVDF ternary energetic composites were prepared by the electrostatic spraying method for the first time, where NiF2 functions as the oxidant. At the same time, PVDF serves as both the oxidant and the binder. The energetic characteristics of the samples were studied through thermal analysis and preliminary ignition and combustion tests. It is found that the prepared samples are generally in the form of microspheres, in which PVDF binds Si and NiF2 particles together. The addition of Si nanopowder can promote the early decomposition of NiF2, which can improve reactivity. Compared with a physically mixed counterpart, the exothermic reaction between Si and PVDF in microspheres starts at lower temperatures and proceeds to more completion. The electrostatically sprayed sample also shows a shorter combustion time and a more intense luminescence phenomenon.
Study on the influence of mildew on the structure and composition of polycarboxylic acid superplasticizer
Authors: Lin Zhiqun 
Published: July 2023

Abstract
In hot weather, the compounded polycarboxylic acid water reducer often appears mildew and corrupt. This paper will discuss the influence of microorganisms on the structure, composition, and performance of polycarboxylic acid water reducer and its possible reasons through the infrared spectrum, gel chromatography, cement paste fluidity and other experimental tests. The research shows that mildew has no obvious effect on the structure of polycarboxylic acid water reducer, but it will consume the retarder components and produce acids and other metabolites. The initial cement paste fluidity decreases, and the maximum is 10.8%.
Research and application of fast-curing anticorrosion inner coatings for vessels in an acid environment
Authors: Ding Chao , Lin Zhu , Li Yajun , Fang Yan , Tan Chuanjiang , Wang Chiyu , Lou Liangjie , Liu Nan , Mao Zhongqiang , Feng Jinsong 
Published: July 2023

Abstract
According to the anticorrosion demand of petrochemical pressure vessel storing acid medium, phenolic epoxy resin and modified amine curing agent was used, and a tertiary amine curing accelerator was added, a fast-curing acid-resistant anticorrosive coating with excellent acid-resistance was developed by adding the appropriate amount of flake pigments and fillers such as graphene and chemical additives. Through Performance Tests and field application, the coating has high adhesion, good resistance to acid media such as CO2 and H2S, fast curing speed, and the curing time can be shortened from 7 days to 4 days at room temperature, the number of construction tracks is reduced from 4 to 2, which is suitable for on-site anticorrosion maintenance of oil field and chemical pressure vessel and storage tank. It can shorten the construction period and improve the construction efficiency and the anticorrosion quality; extending the service life of the anticorrosive coating has a good prospect of popularization and application.
Hydrothermal preparation of cubic sodium zirconium phosphate crystals
Authors: Wang Yubo , Bai Jiajia , Zuo Juan , Peng Hailong , Hou Haotian , Wang Haoyue , Lan Ning 
Published: July 2023

Abstract
NASICON type material NaZr2(PO4)3 is considered to be the ideal solid electrolyte choice for solid-state Na batteries due to its excellent low thermal expansion and Na ion conductivity. However, the often-prepared solid-state reaction method requires a high reaction temperature and produces other polymerized phosphates and environmentally unfriendly substances. This paper’s hydrothermal method quickly prepared NaZr2(PO4)3 crystals with cubic morphologies at a low temperature. The effects of different concentrations of NaH2PO4 solution and different hydrothermal times on the preparation of the powders were explored. XRD, SEM, TEM and IR tests characterized the as-prepared samples. The results show that the NaZr2(PO4)3 crystals synthesized by the hydrothermal method have good crystallinity and a clean surface, with a standard cubic morphology and a size distribution between 400 nm and 750 nm. This indicates that the hydrothermal method is an effective synthesis one.
Study on Preparation and Properties of Bisphenol S Polycarbonate
Authors: Liu Bin , E Yongsheng 
Published: July 2023

Abstract
Bisphenol S replaces bisphenol A to synthesize bisphenol S polycarbonate, which introduces the sulfone group in polycarbonate, improves the heat resistance and flame resistance of polycarbonate, and expands its application field. In this experiment, bisphenol S reacts with triphosgene to synthesize bisphenol S polycarbonate by interface polycondensation method. The effects of various factors on the product’s molecular weight are investigated and the optimal conditions of reaction are obtained. Through the infrared absorption spectrum, we verify the product structure. Through the Ubbelohde viscometer, the maximum viscosimeter molecular weight is measured and calculated to be 18500. Through the dilatometer, we detect the product’s temperature of glass transition at 166.5°C, which indicates that bisphenol S polycarbonate has good heat resistance. The limiting oxygen index of the product is 33.5%, and the combustion performance level reaches V-0, which indicates that bisphenol S polycarbonate has good flame retardancy.
Effect of Laser Surface Texturing on the Service Performance of Polyetheretherketone
Authors: Sang Shunheng , Wei Wei , Wang Xiaohui , Qiao Yang 
Published: July 2023

Abstract
Polyetheretherketone (PEEK) is an aromatic, semi-crystalline thermoplastic polymer with good wear resistance, corrosion resistance, superior mechanical properties, chemical stability and biocompatibility. While the elastic modulus of PEEK is highly similar to that of cortical bone, based on the many such excellent material properties of PEEK, it is determined that it is often used in intervertebral fusion, artificial joint replacement and trauma implants, etc. Biomedical fields. However, the biological inertness and hydrophobicity of PEEK make it difficult to form osseointegration with human bone, thus limiting its use as a bone repair material. In order to make PEEK better used in the human bone implant field, obtaining PEEK bone implants with excellent biological properties has become the focus of many scholars’ research. In this study, the PEEK surface was laser textured to produce a regular shape, which resulted in a laser-modified PEEK material with better properties. The purpose of this study is to improve the micro-abrasion and wetting properties of PEEK and to enhance the service performance of PEEK materials.
The Research on Characteristics of SAC305/Sn-37Pb/ENIG Solder Joint
Authors: Wang Yanqing , Jiang Qinglei , Feng Mingxiang , Li Xinxin 
Published: July 2023

Abstract
The reliability of the mix alloy of lead and lead-free components with SnPb paste is an important issue for military electronics. With the increase of density in PCB assembly, the traditional HASL pad has been gradually replaced by the ENIG pad for its better flatness and solderability. But the relationship between the interfacial morphology, microstructure and reliability of the alloy of lead and lead-free components still needs to be further studied. In this paper, the microstructure on the interface of SAC305/ Sn-37Pb/ ENIG solder joint is compared with that of typical SAC305/ Sn-37Pb3/ Cu solder joint, Sn63Pb37 / ENIG solder joint. It is found that the IMC layer on the interface of SAC305/Sn-37Pb/ENIG solder joint is more closer to compound (Cu, Ni) 6Sn5, and limited reflow soldering times has little effect on the strength of SAC305/Sn-37Pb/ENIG solder joint. Based on the case study, the thickness of gold layers has a significant effect on black pad problem in ENIG pad.
Research on Sensitive Fluorescence Detection of Fe3+ and Cr2O7
2- in River Based on Ln-MOF Materials
Authors: Wang Runnan , Zhang Hao , Wang Sibo , Meng Fanxu , Sun Jing , Lou Dawei , Su Zhongmin 
Published: July 2023

Abstract
Excessive release of Fe3+ and Cr2O7
2- would threaten public health and environmental safety. Seeking an effective probe for Fe3+ and Cr2O7
2- sensing by a simple and rapid approach in real water samples is significantly desirable. Herein, Eu-MOF for monitoring Fe3+ and Cr2O7
2- were obtained and characterized by PXRD, FT-IR spectroscopy and luminescence spectroscopy. The study showed that Eu-TDA exhibited high sensitivity, special selectivity, and strong stability for Fe3+ and Cr2O7
2- detection. The limit of detection for Fe3+ and Cr2O7
2- were as low as 2.43×10-6 and 3.26×10-6 M, respectively. The fluorescent detection method was used for actual water samples from Songhua River, which obtained satisfied recovery from 98.84% to 106.22%.
Simulation Research on Variable Parameter Drilling of Glass Fiber Reinforced Composite / Copper Foil Laminates
Authors: Shi Hongyan , Zhou Qian , Wang Zhaoguo , Chen Zhuangpei , Zhu Tao 
Published: July 2023

Abstract
Micro-holes play an important role in interconnecting different signal layers of printed circuit boards(PCBs), and their surface quality is critical to signal transmission performance. As an important parameter, drilling force affecting the quality of micro-holes, but its distribution is difficult to obtain because the size of micro-holes is tiny and the drilling process is usually in a semi-closed state. Therefore, simulation of the micro-hole drilling process is studied by Abaqus in this paper. The material of printed circuit board can be regarded as laminated material composed of glass fiber composite and copper foil. The whole simulation process is the simulation of alternating drilling of the two materials. Via simulation, the influence of different drill parameters and processing parameters on the output drilling stress, axial force and drilling quality is obtained, and the results are consistent with the experimental results in the literature. This simulation method can be used as a supplement to the experiment and can provide guidance for the drilling process of printed circuit boards.
Fiber optic detection method for intrinsic defects in carbon fiber composite core overhead conductors considering bending performance
Authors: Wang Yixin , Jia Boyan , Wu Guoqiang , Liu Hongliang , Yi Xiaoyu , Liu Jie 
Published: July 2023

Abstract
Carbon fiber composite core wire in the carbon fiber core rod bending strength is low, easy to break, and thus affects the detection effect. In this regard, it is proposed to consider the bending performance of carbon fiber composite core overhead wire intrinsic defects fiber detection method. The overhead wire is X-ray scanned, and the image is bent compensated by the filtering algorithm. The image is reconstructed using an iterative reconstruction algorithm, and the Tamura texture feature operator is used to extract the roughness feature parameters in the texture feature enhancement map of each conductor to achieve the identification of defects. In the experiments, the proposed method is verified for detection accuracy. The analysis of the experimental results shows that the proposed method has a high correct defect recognition rate and has a more excellent detection accuracy when the proposed method is used to detect the inherent defects of overhead conductors.
The development and application of Silicone-based heat transfer fluids
Authors: Si Rong , Jing Dong , Liu Feng , Kong Dexin , Liu Xiaodi , Lu Jialin 
Published: July 2023

Abstract
The main component of Silicone-based heat transfer fluids is modified silicone oil. The high and low using temperature of silicone-based heat transfer fluids is better than hydrocarbon organic heat transfer fluids. The raising of the maximum using temperature means that it can obtain higher temperature steam in the heat transfer process of the system, and the power generation efficiency of the turbine will be improved remarkably if the silicone-based heat transfer fluids are used in parabolic through the solar power system. It can also increase the efficiency of a solar thermal power plant, so silicone-based heat transfer fluids will be the new type of heat transfer medium. The paper compares these two mediums in terms of structure, composition, and deterioration and introduces the using performance and synthesis method of Silicone. The status of Silicone and problems of application are also presented.
Mineralogical Characteristics and Refractory Properties of Arsenic-bearing Gold Concentrate
Authors: Li Jiafeng , Yang Hongying , Tong Linlin , Chen Qiao 
Published: July 2023

Abstract
The arsenic-bearing gold ore in Anhui, China is an extremely refractory gold ore, and the cyanide leaching rate of gold concentrate is only 30%. The mineralogical factors of the low leaching rate were discussed by process mineralogical analysis. The results demonstrate that the gold concentrate contains 20.30 g/t gold, 3.39% arsenic, 29.80% sulfur, and 4.10% iron. Gold exists in the occurrence states of metallic mineral-wrapped gold, gangue mineral-wrapped gold, and fissure gold, which account for 64.90%, 8.31%, and 26.79% respectively. Pyrite, arsenopyrite, realgar, sphalerite, and pyrrhotite are the main metallic minerals in the gold concentrate. Among them, pyrite accounts for 51.20%, and arsenopyrite accounts for 24.30%. Gangue minerals include feldspar, sericite, quartz, calcite, and chlorite. Among them, feldspar, sericite, and quartz account for 30.30%, 22.70%, and 22.10% respectively. In addition, the grain size distribution and distribution characteristics of various minerals are obtained, and the texture and structure of the gold ore are analyzed. Pyrite and arsenic phase are the main factors causing the low gold leaching rate. The presence of carbonate minerals and clay minerals also has an effect on the rate of gold leaching. The oxidation pretreatment can increase the gold leaching rate to about 94%. The findings provide a theoretical foundation for the selection of manufacturing techniques in businesses and play an important guiding role in the development of similar ores.
Tribological Behaviour of 3D printed Polylactic Acid (PLA) Sliding Against Steel at Different Sliding Speed
Authors: Palaniandy L , Ismail K I , Yap T C 
Published: July 2023

Abstract
In this study, the tribological properties of fused deposition modelling (FDM) 3D printed Polylactic Acid (PLA) is studied when it slides against a steel disk at various speeds. 3D printed pins were printed using PRUSA MINI+ 3D Printer according to recommended printing parameters. Pin on disc tribological tests were conducted at normal load of 20 N, sliding time of 20 minutes, and linear sliding speeds of 0.46, 0.58, 0.7 and 0.81 m/s. Experiment results showed that wear rate increases with the increase of sliding speed, and coefficient of friction decreases with the increase in sliding speed. Observation of worn surfaces suggested the major wear mechanisms are abrasion, adhesion, and delamination. The difference in tribological behaviour was mainly caused by hardness-temperature relationship. The main anomaly that occurred in the observed trends are that the pin melted at highest sliding speed, resulting in opposite trends. The increase in temperature at the contact point of the pin and sliding disk weakens PLA pins. Therefore, 3D printed PLA can be used in a temperature-controlled low speed sliding application such as a lubricated gear and not for applications that subjected to high sliding speeds and temperature.
Numerical Simulation of a Prefabricated Stair Mold Under Fluid Pressure
Authors: Meng Ling-hui 
Published: July 2023

Abstract
In order to realize the large-scale and factory production and transportation of stairs in prefabricated buildings, this paper proposes a prefabricated stair mold, and uses midas Gen to conduct finite element analysis on the stair mold, and obtains the force size of concrete in the form of fluid on the stair mold after pouring. Thus, the displacement contour, stress and local and global deformation rules of each plate of the stair mold are obtained.
Optimization of the Extraction System of Total Phenolic from Garcia mangostana using Response Surface Methodology
Authors: Chung Tsair-Wang , Kurniawan Irwan Saleh 
Published: July 2023

Abstract
Mangosteen (Garcia mangostana) consist of 40% flesh and 60% pericarp. Mangosteen pericarp has unpleasant taste of bitterness and usually disposed as waste. However, mangosteen pericarp contains xanthones which are polyphenolic compound that proven has high antioxidant activity were found abundantly in mangosteen pericarp. This study aims to investigate water extraction optimum operating conditions to be applied in industry by using RAM (response surface methodology) for the recovery of total phenolic extract from the pericarp of mangosteen. Box-Behnken experimental design used 3 factors. Solid-to-liquid ratio (g/ml), temperature (°C) and extraction time (hour) were analysed to compare the response of total phenolic content (TPC). Under the operating conditions, the highest TPC is 0.906 (g/l) at the factors of 1:10 (g/ml), 65 °C, and 3-hour. The optimum parameters determined by using RSM are at 1:10 (g/ml), 59.74 °C, and 2.87-hour with TPC 0.835 (g/l).
Research on Virtual Reality Head-Mounted Displays based on MEMS Technology
Authors: Ren Zhongju , Dong Keyan , Fu Xiuhua , lai Ying , Zhang Jingjing 
Published: July 2023

Abstract
In order to render the gaze area and increase the pixels per degree of the area, this virtual reality head-mounted display device adds two MEMS 2D miniature scanning mirrors to the main display imaging, with a laser diode as the projection light source and the main display as the projection receiving screen. The light emitted by the laser lamp is projected onto the main display through multiple reflections. Through pre-processing of the image of the main display and the projected display, the image of the main display is combined with the projected image to achieve the rendering effect. It is integrated with an eye tracking system that allows the projected image to be consistently projected on the human eye area. The projection image is projected over the entire imaging area of the main display by resonant rotation of two MEMS 2D microscope mirrors.
Source or sink? Meta-analysis reveals diverging controls of phosphorus retention and release in restored and constructed wetlands
Authors: Ury Emily A , Arrumugam Puvaanah , Herbert Ellen R , Badiou Pascal , Page Bryan , Basu Nandita B 
Published: July 2023

Abstract
Wetland restoration is a popular nutrient management strategy for improving water quality in agricultural catchments. However, a wetland’s ability to retain phosphorus is highly variable and wetlands can sometimes be a source of phosphorus to downstream ecosystems. Here, we used a meta-analysis approach to explore the source and sink capacity of 139 wetlands for both total phosphorus (TP) and the more bioavailable form, phosphate (PO4
3−), at seasonal and annual timescales. Median retention efficiency across all studies is 32% for TP and 28% for PO4
3−, however the range is extremely broad. We found that wetlands are often sinks for TP (84% of site-years) and PO4
3− (75% of site years). The median TP retention within wetlands that are sinks (2.0 g·m−2·yr−1) is greater than release by wetlands that are sources (−0.5 g·m−2·yr−1). In contrast, for PO4
3−, median retention within wetlands that are phosphorus sinks (0.8 g·m−2·yr−1) is of similar magnitude to that released by wetlands that are phosphorus sources (−0.7 g·m−2·yr−1). We found that phosphorus release from wetlands coincides with higher hydraulic loading rates, lower influent phosphorus concentration, and legacy soil/sediment phosphorus. Phosphate releases were especially common in wetlands used for treating municipal wastewater, as well as restored and constructed wetlands with flashy, precipitation-driven flow. We found that experimental design may inherently bias our understanding of wetland performance for phosphorus retention as studies conducted in mesocosms outperform other wetland types. Analysis of monthly data demonstrated significant temporal variability in wetland phosphorus dynamics, often switching from retention to release many times within a year, but with no generalizable seasonal trends. Our results highlight the value of restoring wetlands for phosphorus retention and point to ways of furthering their utility towards improving water quality by simultaneously targeting retention enhancing measures and release avoidance.
On the role of climate change in the 2018 flooding event in Kerala
Authors: Dhasmana Manish Kumar , Mondal Arpita , Zachariah Mariam 
Published: July 2023

Abstract
The extreme precipitation during August 2018 in Kerala, India was catastrophic, triggering one of the worst floods in history. There is growing evidence of human-induced climate change in driving hydroclimatic extremes across the globe. However, whether and to what degree the 2018 flooding event in Kerala was influenced by climate change has yet to be fully understood. To this end, we present the first formal attribution analysis of the event, using the probabilistic event attribution (PEA) framework. Three methods using (i) Historical and HistoricalNat runs from CMIP6 (general circulation models-based method), (ii) observed records from 1901–2018 for two periods, split at 1950 (time-slice method) and (iii) observations that are scaled to 1901 and 2018 climates (scaling method), are considered for quantifying the risk ratio (RR) of the event. Using an objective approach, the 2018 precipitation event is defined by the return period of the 4 day cumulative precipitation over the Periyar River Basin (PRB), during 15–18 August, 2018. The subsequent flood event is characterized by the return period of the 1 day maximum streamflow at one of the outlets of the PRB, where maximum impact during the event was reported. The results from multiple methods are consistent, suggesting that the event is exceptionally less likely to have been caused by anthropogenic climate change, with RR for the precipitation and flood events ranging from 0.31 to 0.82 and 0.55 to 0.8, respectively. The role of wet antecedent soil moisture conditions, which is found to be the primary driving factor of floods in the PRB, is also found to be unchanged between simulations with and without climate change. Our results highlight the challenges in unequivocal discerning of the climate change signal on regional hydrological events and emphasize the importance of better consideration of local confounding interventions in PEA studies.
Complete and orthonormal sets of exponential-type orbitals with non-integer quantum numbers
Authors: Bağcı A , Hoggan P E 
Published: July 2023

Abstract
Atomic and molecular orbitals show exponential decrease at long range. Complete orthonormal basis sets for atoms should satisfy this criterion. A number of such bases have been used in physics (e.g. Coulomb Sturmians). The challenge of this work is first adapting Slater type Orbitals for this role, as they are not radially orthogonal. Even more important is their generalization to non-integer quantum numbers that have applications for configuration interaction. This generalization requires the whole apparatus of non-integer calculus that is presented using the Riemann–Liouville approach.