bluuebunny/crossref_metadata_2025_split huggingface dataset:
Size Optimization of Spherical Silver Nanoparticles Synthesized with Baicalin and Sodium Dodecyl Sulfate Using Response Surface Methodology
Authors: Wang Dong , Wang Lihui , Sun Qingyi , Qu Jincheng , Zhang Xiaowen 
Published: January 2024

Abstract
This study aimed to optimize the synthesis of silver nanoparticles mediated by Baicalin and sodium dodecyl sulfonate using Single factor experiment method and response surface methodology, to optimize their process parameters so as to prepare spherical silver nanoparticles with smaller particle size, and to compare the particle size of silver nanoparticles prepared under different conditions by comparing the wavelength of the maximum absorption peak measured by UV-visible spectrophotometer. Thus, the best synthesis program was determined. The average particle size of the silver nanoparticles prepared under the optimal conditions was 32.25 nm with high sphericity, and the silver nanoparticles synthesized under the optimized conditions were characterized by SEM, FTIR, particle size distribution and UV-vis.
Study on the Pull-Out Behavior of Glass Fiber Bundle in Mortar
Authors: Liang Yuehua , Cheng Congmi , Ling Shan , Jiang Shusen , Luo Xu 
Published: January 2024

Abstract
In this paper, the influence of the embedment depth of glass fiber bundle in mortar on its pull-out behavior was studied. The time-dependent pull-out behavior of glass fiber bundle in mortar at 28 d, 56 d, 84 d, and 168 d under natural curing was investigated. The results show that there are three stages of pulling out the fiber bundle from the mortar: complete elastic stage, debonding stage, and sliding pull-out stage. With the increase of embedment depth, the pull-out energy of the fiber bundle first increased and then decreased. The pull-out energy was the highest when the fiber bundle embedment depth was 15 mm. The greater the embedment depth, the lower the ultimate bonding strength of the fiber bundle. This is because the larger the initial embedment depth of the fiber bundle, the greater the bonding force between the fiber monofilament and the mortar, which is more likely to cause the fiber monofilament to fracture.
Robot-Assisted Ultrasonic Testing Technology for Complex Revolved Workpiece
Authors: Wang Jingpin , Zhang Hanming , Xu Honghai , Wang Changyu , Cao Jiarui , Liu Tianqi , Li Zefeng , Yang Jiaji 
Published: January 2024

Abstract
High temperature, fatigue, and impact are the main causes of internal cracks in revolved workpieces. Crack propagation assessment is an effective method to avoid fracture. Ultrasonic testing has been widely used when testing internal cracks in revolved workpieces. However, the existing ultrasonic detection equipment makes it difficult to detect revolved workpieces with complex structures. This paper proposes an automation system including six degrees of freedom (DOF) robot, ultrasonic transducer, and turntable. The system can realize non-destructive testing automatically for complex revolved workpieces. A new method is designed to measure and correct verticality error and eccentricity error. The method was applied to detect complex revolved workpieces and the detecting resolution can be effectively improved.
Cam Profile Design of Low-Speed Marine Diesel Engine Based on the Grey Theory
Authors: Xu Zhen , Chen Jianzhi , Jing Xuwen 
Published: January 2024

Abstract
The camshaft profile is one of the important parameters of the engine, the reasonableness or otherwise of its design directly influences the engine’s power output, fuel consumption, emissions, noise and reliability. However, most existing cam profile optimization designs are based on the basic software operation, profile parameter selection and tuning lack a scientific theoretical basis. In order to address this issue, this study establishes a single valve kinematic model of the gas delivery mechanism of diesel engines by using the AVL-EXCITE Timing Drive, and performs a model-based multinomial kinematic acceleration cam profile design. Subsequently, an orthogonal design method is employed to obtain the parameter combinations that can satisfy the dynamic requirements. The research investigates the influence of cam profile design parameters (C
4, p, q, r, and s) on valve fullness, maximum jerk, cam contact stress, and valve seating force through a systematic study. Lastly, based on the grey correlation theory, a thorough analysis of the performance indices of cams with different profile parameter combinations is conducted. The optimization problem of the profile parameters with multiple performance indicators is transformed into a single-objective grey relational optimization problem, resulting in the optimal cam profile parameter combination of C4
=0.1, p=14, q=20, r=28 and s=36. The optimal method proposed in the paper is straightforward to implement and is applicable to the optimum design of cam profiles of the engine, which is of great importance for the optimal design of cam fabrication processes.
Acid Fracturing Technology and Effect Evaluation of Carbonate Horizontal Well in Fuman Oilfield
Authors: Li Wei , Chen Liang , Wang Xin , Fan Qinghu , Xu Guowei , Xiao Wenliang , Li Xinting , Ye Zhiquan 
Published: January 2024

Abstract
Since the deep and ultra-deep carbonate rocks in the Fuman oilfield have made continuous breakthroughs, the acidification and fracturing of the reservoir on the south bank of Tarim River have been faced with problems such as faster acidification and shorter effective acidification fracture length with the increased burial depth and formation temperature, which seriously restrict the effect of acidification and fracturing. At present, the Fuman oilfield has achieved remarkable results after acid fracturing construction. In this paper, the acid fracturing construction effects of multiple reservoir reconstruction Wells in Tahe Yueman, Fuyuan, Guole, and Manshen blocks are evaluated and classified by analyzing acid fracturing construction curves, using fracture static pressure fitting and fracture conductivity curve analysis. The characteristics and distribution law of carbonate reservoirs corresponding to different construction curves are studied, and various situations of artificial fractures communicating with natural fracture-cavity systems are analyzed. The research results can accurately guide the design optimization and development of acid pressure.
Fabrication of Strong Basic Sites on Cr3+ Doped Reductive Support and Its Catalytic Application for Transesterification
Authors: Yu Xiang , Mo Xuekun , Chen Hanming , Jiang Xiangyang , Xu Bingbing , Zhu Mingqiao 
Published: January 2024

Abstract
Solid strong base catalysts have attracted much attention for their excellent catalytic performance and environmental friendliness due to heterogeneous properties. However, this kind of catalyst usually needs a higher temperature to be activated. Therefore, it is still a challenge to obtain high-activity catalysts at lower fabrication temperatures. In this paper, a reductive catalyst support containing low-valence metal centers (Cr3+) was prepared. Through the redox reaction between the Cr3+ and KNO3, the basic sites can be produced at lower temperatures on the reductive support (Cr-MeIM). Thermogravimetry-mass (TG-MS) spectrometer results showed that the base precursor began to be transformed into basic sites at about a low temperature of 180°C. The solid base catalyst was applied into transesterification between ethylene carbonate (EC) and methanol. By using 0.05 g of catalyst for 3 h at 70°C, we obtained a dimethyl carbonate (DMC) yield of up to 60.9%, which means that the catalyst has high activity.
Testing and Analysis of Frictional Performance of Carbon Fiber/Metal Composite Materials
Authors: Jiao Yuxin , Li Jing , Li Qinghua 
Published: January 2024

Abstract
In order to enhance the friction and wear performance of carbon fiber/steel composite structures, experiments were conducted to adjust the ratio of thermosetting epoxy resin and C12-C14 glycol ether. A modified liquid was developed that could fully fill the gaps in the carbon fiber and enhance the adhesion characteristics between the fiber surface and 18CrMnTiH round steel material. The effects of self-made modified epoxy adhesive and single-component epoxy adhesive on the mechanical properties of composite materials were compared using ISO814-86 determination of the bond strength of sulfur-cured rubber to metal—two-plate method and international standard ISO1747-1976 determination of the shear strength of sulfur-cured rubber bonded to rigid metal plates—four-plate shear method. The friction and wear performance test analyzed the friction coefficient of composite materials under different pretreatment times. The results showed that the pretreatment treatment effectively reduced the friction coefficient of carbon fiber and effectively extended the service life of the material. This study has certain reference significance for extending the friction and wear resistance performance of carbon fiber-reinforced relative motion metal parts.
Properties of Rubidium-Doped Potassium Titanyl Phosphate (Rb: KTP) Grown by Hydrothermal Method
Authors: Lv Hu , Zhang Changlong , Zhang Jian , He Xiaoling , Zhou Haitao , Wang Dongjie , Wang Dong , Luo Yong , Ma Zhi , Wu Wenyuan , Deng Zhengzhong 
Published: January 2024

Abstract
As an electro-optical crystal with excellent properties, potassium titanyl phosphate (KTP) has high conductivity limits electro-optical applications. In this experiment, Rb-doped KTP crystals were grown by the hydrothermal technique of micro-doping and sustained-release, the crystal structure was determined by XRD, the presence of Rb in the crystals was explored by EDS, and the role of Rb in the crystals was investigated by Raman technique. Frequency-dependent dielectric constants were studied at room temperature, which decreases sharply at low frequencies. The variation of the conductivity of the crystals at different temperatures was investigated, and it was found that the room temperature conductivity of the KTP crystals, which were micro-doping by large ionic, was able to drop to 10−13 S/cm, which is about two orders of magnitude lower than that of the pure KTP crystals.
Parameter Selection for Milling Machining of Thin-Walled Parts Based on Spatial Distribution of Side Blades
Authors: Tang Lianyao , Cai Xiaona 
Published: January 2024

Abstract
In the machining of thin-walled components, the tool’s side edges play a pivotal role in the cutting process. This paper presents the establishment of the AdvantEdge 3D simulation model for the analysis of the contact conditions and the variation in cutting forces between the side edge and the machined surface across varying cutting depths. Subsequently, milling experiments were conducted to assess the impact of the side edge’s contact conditions on the surface quality of the machined parts, considering different cutting depths. The findings reveal that during side milling of thin-walled components, a lower number of teeth result in reduced cutting edges, decreased cutting forces, and improved surface quality. The selection of cutting depth should be made with due consideration to the contact conditions between the tool’s side edge and the workpiece. Ideally, the cutting depth should be less than the pitch of the side edge’s spatial curve to ensure that only a single cutting edge is engaged in the cutting process.
Preparation and Pesticide Release Performance of Carboxymethyl Chitosan Film
Authors: Xu Qing , Long Shangjun , Zhu Guangjuan , Li Jinyan , Zhou Yuanjing 
Published: January 2024

Abstract
The slow/controlled release technology is effective in enhancing the utilization of pesticide and reducing the environment pollution caused by pesticide. In this study, the slow/controlled release carboxymethyl chitosan films were prepared by film casting method, and the pesticide release properties were investigated. The results showed that the pesticide-loaded carboxymethyl chitosan films were smooth and uniform. Different pesticide-loaded films had different film thicknesses, pesticide loading and encapsulation efficiency, but had the same pesticide release trend, which might be the result of multiple pesticide release mechanisms including the swelling and erosion of the carboxymethyl chitosan. This study would promote the application of slow/controlled release technologies in pesticides and accelerate the green and efficient development of agriculture.
Analysis of Wax Formation Mechanism and Anti Wax Effect of Oil Well Tubing in a Certain Oilfield
Authors: Feng Shaobo , Huang Kun , Zhao Mifeng , Xiong Maoxian , Teer Ba , Wang Shuai 
Published: January 2024

Abstract
During the production process of oil wells, wax deposition is caused by factors such as temperature reduction and dissolved gas precipitation. Severe wax deposition in oil wells can cause tubing blockage, leading to a decrease in oil well production and even stopping production due to wax blockage, affecting normal oil well production. Therefore, wax deposition can have a serious impact on the wellbore and even oilfield production. This article takes a certain oilfield block as an example to analyze the mechanism of wax deposition in oil wells and compares the effectiveness of commonly used wax removal and prevention measures such as different hot washing processes, adding wax removers, running acoustic viscosity reduction and wax prevention devices along with the oil pipe, and hot washing packers for sealing wells. The results show that superconducting hot washing, adding wax remover, and using acoustic wave viscosity reducing and wax preventing devices can effectively slow down wax deposition in oil wells. The use of hot washing packers effectively solves the problem of long-term inability to hot wash sealed wells, and it is recommended to promote their use.
Research on Precision Bending Forming Technology of Aluminum Alloy Outer Frame
Authors: Tian Jun , Gong Weilun , Chen Xiong , Wang Zhihua , Hu Zhigang , Li Kang , Jin Shuoxun 
Published: January 2024

Abstract
In this paper, the 6063 aluminum alloy outer frame is prone to cracking during bending forming. We analyze the strength and plasticity of the material through tensile experiments (in situ stretching, high-temperature stretching), and establish constitutive models based on component material parameter equations. Using COMSOL Multiphysics software, numerical simulation was conducted on the bending forming of 6063 aluminum alloy profiles, analyzing the stress and deformation of the material during the extrusion process. By utilizing simulation results to design and improve the process and mold, the aluminum alloy outer frame will not produce cracks during the bending forming process, thereby improving the product qualification rate.
Key Technology of 240°C High-Temperature Drilling Fluid
Authors: Shan Wenjun , Duan Xiaoqing , Jiang Guancheng , Sun Jinsheng , Meng Xianglong , Song Bingqian 
Published: January 2024

Abstract
Hot dry rock (HDR) is a renewable green and clean energy source from the depths of the earth. It has the characteristics of high efficiency, environmental protection, safety, and stability, and is not restricted by seasons and climates. Difficulties in exploration and development include deep burial, formation fragmentation, abnormal pressure, high well temperature gradient, and high hole bottom temperature (usually >200°C), key technical issues such as sticking. This paper analyzes the difficulties of high-temperature resistant drilling fluid in dry hot rock: temperature resistance of treatment agents and systems, foaming, leakage, wellbore instability, and other problems. The optimization and experiment of treatment agents such as loss reducers, high-temperature protective agents, etc., and research on drilling fluid technology resistant to high temperature of 240°C in hot dry rock drilling has been carried out, through the optimization experiment of pulping materials and high temperature treatment agent. The main formula is: 3%-4% Sodium bentonite + 2%-3% HPS + 3%-4% SPNH + 2%-4% GJA + 3%-4% JSJ-1 + 0.5%-1.0% GGDP + 1% GBHJ. The drilling fluid formula has good rheology after hot rolling at 240°C, API filtrate loss<5ml, the viscosity recovery rate is over 90%. It provides effective technical support guarantee for promoting the exploration and development of hot dry rock resources in China.
Efficiency and Cost of the “Fenton+Recapter” Combined Process for Treating the Electroplating Nickel Wastewater
Authors: Han Qi , Huang Yi , Wang Xiaojiang , Liu Yang , Lin Wu , Zhang Fan , Chen Xiaodan , Wang Hongjie 
Published: January 2024

Abstract
The aim of this work was to investigate the “Fenton+Recapter” combined process for treating electroplating nickel wastewater. Firstly, five commonly used dithiocarbamate heavy recapters (DTC types) were compared and selected through trial tests. Then, the optimization of the sole Fenton process was carried out, including the dosing molar ratio of Fe2+/H2O2, the dosage of H2O2 and the reaction time. At last, the optimization and cost analysis of the combination process was carried out to meet the nickel wastewater treatment standards and to determine the optimal fit point. The experimental results showed that DTC-2 was a more suitable heavy recapter, with advantages of wide pH adaptation range (3.0-11.0), strong anti-interference, fast Ni removal rate, and low cost (1.20 ¥/t). The optimal molar ratio of Fe2+/H2O2 in the sole Fenton process was determined to be 0.8, which resulted in the optimum breaking effect and a 98.5% removal rate of Ni. The optimization of the combined process parameters showed that when the dosage of heavy recapter DTC-2 (1%) was 0.08 mg/L, 0.19 mg/L, 0.5 mg/L, 1.25 mg/L, 7.5 mg/L, and 25 mL/L respectively, the residual concentration of Ni in Fenton effluent was 0.2 mg/L, 0.3 mg/L, 0.5 mg/L, 0.7 mg/L, 1.0 mg/L, and 1.5 mg/L, which all could meet the discharge standards (concentration of Ni ≤0.1 mg/L). The best fit for the “Fenton+Recapter” combined process was to first treat nickel wastewater with Fenton until the Ni concentration was about 1.0 mg/L, and then use heavy recapter DTC-2 to capture and treat the wastewater until it meets the standard discharge. Under this condition, the treatment cost of the combined process was the lowest (7.79 ¥/t).
Impacts of Future Climate Change on the Distribution of Typical Endangered Bird Species in Beijing
Authors: Yu Jianqi , Ma Xiaoyan , Wang Jia , Feng Li 
Published: January 2024

Abstract
Understanding the habitat needs of endangered bird species in the context of dynamic climate change is essential for guiding the design of existing conservation areas. The Maximum Entropy Model (MaxEnt) was used to predict the suitable habitats of 18 typical endangered birds in the “Key Protected Wildlife List of Beijing Municipality”, 19 climatic variables from 2041 to 2060, and 8 habitat environment variables affecting the distribution of birds were comprehensively analysed. SPSS 26 was utilised to evaluate the environmental variables incorporated into the MaxEnt model, while ArcGIS was utilised to process the prediction results. The dependability of the method was validated by the reliability of the model (mean AUC value of 0.93 and standard deviation of 0.045 for the training set; mean AUC value of 0.88 and standard deviation of 0.079 for the test set). The most significant variables, according to the jackknife test, were yearly precipitation (6.415%), precipitation in the heaviest month (5.390%), annual temperature range (2.945%), distance to water sources (29.330%), and the normalised vegetation index (11.775%). The results suggest that highly suitable habitats cover 18.67% of the region (3064.14 km2), while unsuitable habitats cover 10.61% (1741.101 km2). Formal protection and management measures for the study objects were advised based on the prediction results.
Effects of Rhizosphere Microbial Composition on the Growth of Cajanus cajan in Coal Gangue Reclaimed Soil
Authors: Wang Yuexia , Shi Kaiyi , Han Shiming , Zhou Xiaoji , Gao Liangzhi 
Published: January 2024

Abstract
This study aimed to investigate the microbial diversity and functions of Cajanus cajan root systems planted in plateau waste dumps collected in Liupanshui City, Guizhou Province, China. The gangue dump (1,390 m above sea level) in the Guizhou Plateau was covered with soil and planted with YN and JX C. cajan. After 1 year, the C. cajan root system was collected, and high-throughput sequencing was used to examine its bacterial and fungal biodiversity. The unclassified_f_Enterobacteriaceae and Cedecea were the most abundant genera. Venn and heatmap analyses revealed differences in the dominant species Lactococcus and Fusarium in the rhizosphere of C. cajan varieties. In JX and YN, Pseudoarthrobacter is a unique genus of bacteria; in JX, Robillarda is a unique genus of fungi; and in YN, Scytalidium is a unique genus of fungi. Endophytic fungi mainly play the roles of saprotroph, plant pathogen, and endophyte. Among the bacterial properties, L-arabinose isomerase and adenosine triphosphatase were the most abundant in all samples, while chitinase, catalase, and laccase played important roles in photosynthesis and the degradation of lignin, chitin, and chitosan. Our findings may guide the selection of reclamation plants and strategies for the mitigation and restriction of heavy metals in soil.
Research on the Current Situation and Protection Measures of the Water Environment of Tianjin Qilihai Wetland
Authors: Zhang Yi , Peng Junhan , Hong Wu , Zheng Lin 
Published: January 2024

Abstract
The Qilihai Wetland located in Tianjin is one of the important wetlands in northern China and an important transfer station for migratory birds. Its water environment quality is crucial for improving the regional ecosystem function, and is therefore known as the “green lung of the Beijing-Tianjin region”. This paper conducted on-site monitoring and a comprehensive evaluation of the current situation of the Qilihai environment during the dry season and the rainy season. Based on this, countermeasures and suggestions for water environment protection were proposed from the aspects of optimizing water sources, reducing interference, and strengthening governance.
Pretreatment Method of Landfill Leachate for Lessening Membrane Fouling Effect
Authors: Zhang Yaqiong , Jiang Linyu , Zeng Enhua 
Published: January 2024

Abstract
This experiment involved membrane pollution cycle experiments to identify the optimal pretreatment method, which was found to be raw water combined with PAC, effectively reducing membrane fouling. Following pretreatment, the first-stage recovery rate reaches 80%, the chemical cleaning cycle spans approximately 90 hours, and the conductivity of the concentrated water ranges between 35 ms/cm and 40 ms/cm.