bluuebunny/crossref_metadata_2025_split huggingface dataset:
Susceptibility of Plodia interpunctella (Lepidoptera: Pyralidae) developmental stages to high temperatures used during structural heat treatments
Authors: Mahroof R. , Subramanyam B. 
Published: August 2023

AbstractHeating the ambient air of a whole, or a portion of a food-processing facility to 50 to 60°C and maintaining these elevated temperatures for 24 to 36 h, is an old technology, referred to as heat treatment. There is renewed interest in adopting heat treatments around the world as a viable insect control alternative to fumigation with methyl bromide. There is limited published information on responses of the Indian meal moth, Plodia interpunctella (Hübner), exposed to elevated temperatures typically used during heat treatments. Time-mortality relationships were determined for eggs, fifth-instars (wandering-phase larvae), pupae, and adults of P. interpunctella exposed to five constant temperatures between 44 and 52°C. Mortality of each stage increased with increasing temperature and exposure time. In general, fifth-instars were the most heat-tolerant stage at all temperatures tested. Exposure for a minimum of 34 min at 50°C was required to kill 99% of the fifth-instars. It is proposed that heat treatments aimed at controlling fifth-instars should be able to control all other stages of P. interpunctella.
Rheological Properties of Warm Mixed Asphalt
Authors: Chang Rong , Qin Yongchun , Wang Peng 
Published: August 2023

Abstract
Adding a warm mixing agent to asphalt can lower the working temperature of asphalt construction by 20–40 °C. It is difficult to evaluate the impact of the existing warm mixed agent on the quality and effect of asphalt due to its wide variety. In this study, 70 # asphalt and 3 kinds of surfactants were selected to prepare warm mix asphalt. The result of different warm mix agents on the rheological properties of asphalt was evaluated through a rheological experiment. The results explained that the warm mixing agent could lower the Brookfield viscosity of asphalt. With the increase in asphalt temperature, the viscosity difference of different types of asphalt binder becomes smaller and smaller. A warm mixing agent will also reduce the creep stiffness of asphalt. In the multiple stress creep recovery test, the average recovery rate of asphalt and the average value of irrecoverable creep compliance have obvious stress dependence.
The effect of calcium carbonate whiskers on the thermal stability of environmentally friendly and energy-saving building composites
Authors: Tang Haoling , Hu Xiaojun 
Published: August 2023

Abstract
This paper studied the effects of different whiskers on the thermal stability of environmentally friendly and energy-saving building composites by exploring the strengthening mechanism of calcium carbonate whiskers on the thermal stability and mechanical properties of the composites. The results show calcium carbonate whiskers can significantly improve composites’ mechanical properties by reducing the matrix’s micro cracks. When the content of calcium carbonate whisker is 6%, the composite’s tensile strength and water absorption are increased by 43.7% and 25.1%, respectively. In addition, calcium carbonate whiskers have high thermal stability when the content is lower than 65 °C. Therefore, it can be proven that adding calcium carbonate whiskers within this temperature range can significantly enhance the thermal stability of environmentally friendly and energy-saving building composites.
Effects of plasma treatment on surface insulation properties of epoxy composites
Authors: He Guangyuan , An Yongke 
Published: August 2023

Abstract
The surface of epoxy composite material working in DC electric field for a long time is easy to accumulate charge and cause flashover, which seriously reduces its insulation level and poses a threat to the safe operation of electrical equipment. In this study, SiO
x
films were deposited on the surface of nano-SiO2/ER nanoparticles by atmospheric pressure dielectric barrier discharge plasma vapor deposition technology using ethyl nor-silicate as a precursor. The effects of different deposition time on the deposition effect and the pressure level of the film surface were studied. Scanning electron microscope and atomic force microscope were used to characterize the surface morphology of the material, and the flashover voltage before and after deposition was measured. The results show that SiO
x
films of different thicknesses can be formed on the surface of the material at different times of plasma deposition. After extending the deposition time of the film, the film becomes more uniform and dense, the surface roughness of the material decreases continuously, and the electrical conductivity and flashover voltage along the surface increases continuously. After 10 min plasma treatment, the conductivity increased from 1.78×10−16 S to 2.3×10−13 S, while the flashover voltage along the surface increased from 19.29 kV to 22.66 kV, an increase of about 17.5%.
A Novel Geometric Nonlinear Analysis Method for Planar Beam Structures Based on Co- Rotation and Substructure Method
Authors: Liang Luyi , Deng Jihua 
Published: August 2023

Abstract
Nonlinear behavior analysis of structures using finite element methods requires multiple iterative solutions. Therefore, improving computational efficiency while ensuring the accuracy of nonlinear calculations is crucial. In this paper, a new geometric nonlinear analysis method for planar beam structures is proposed, based on the co-spinning method and the substructure method, using a substructure containing two planar beam elements as an example. The co-spinning method accurately calculates small deformations by subtracting rigid body displacement from the large displacement of the structure. The substructure method condenses the degrees of freedom of internal nodes into boundary nodes, greatly reducing the order of the nonlinear equilibrium equation group of the structure. The two methods are combined, and a calculation program is developed using the arc length method, which has good performance in solving nonlinear equation groups. Two classic examples are used to verify the correctness of the proposed method by comparing the results with existing literature.
The effect of wetness at the bonding interface on the bond strength of epoxy mortars for repairing hydraulic concrete
Authors: Xu Zengguang , Sun Tong 
Published: August 2023

Abstract
An experimental study was carried out concerning the effect of the degree of wetness of the concrete interface on the bond strength. Different interface agents were first selected after cutting and treating the precast concrete, and new epoxy mortar was added to form concrete repair specimens after 24 hours. Different matrix moisture contents were set, and the bond strength under bending was evaluated by bending resistance test under different curing ages. The analysis of the results showed that the substrate moisture content affected the bond strength of the interface, and the bond strength was higher at 0% to 50% moisture content. The epoxy interface agent was selected to improve the durability of the concrete effectively.
First principles study of hydrogen induced the grain boundaries decohesion in fcc Ag
Authors: Hu Shiwei , Yin Yihui , Liang Hao 
Published: August 2023

Abstract
Hydrogen embrittlement (HE) is a pervasive but harmful physical (chemical) phenomenon, and it has a profound effect on the mechanical properties of metals. Although the study of HE began as early as the near century and a half ago, the essential mechanism of HE still cannot be completely figured out yet. The metallic-H atoms interaction at the atomistic scale is considered the essence of the HE. Especially the interaction of interstitial H and host atoms at grain boundaries is crucial for revealing the HE mechanism. Here, the first principles simulation is applied to study the effect of the trapped H atoms on the grain boundaries (GBs) cleavage behavior. We construct the GBs with different orientations of the face-cantered cubic (fcc) Argentum (Ag) and conduct the ab initio tensile test for all the GBs. The strength of GBs during cleavage, the distortion of GBs structure, and the electronic structure variation induced by trapped H atoms are analyzed. We find the GBs cleavage strength is generally decreased by trapping H atoms at GBs. The decohesion mechanism is the GBs distortion induced by the local electron density variation of the GBs trapping H atoms.
Design of a strength model for foamed lightweight soil
Authors: Li Zhili , Chen Qi , Zhang Xuqun , Tai Pei , Wang Hao , Chen Rui 
Published: August 2023

Abstract
Foamed lightweight soil has been widely used in civil engineering, and the model for foam concrete has been employed to predict its strength. However, various previous strength models of foam concrete are generally based on the assumption of complete hydration, which is not the case for foamed lightweight soil. For example, Nambiar’s model (reference), a simple and widely used model, sets the ratio of hydrated water to cement by weight as an empirical constant, which is actually related to the water-cement ratio before the completion of hydration for foamed lightweight soil. To address this issue, an improved strength model tailor-made for foamed lightweight soil was proposed to establish a relationship between the ratio of hydrated water to cement and the water-cement ratio. The improved model and the original Nambiar’s model were compared with actual strength data, which shows that this improved model is more effective for foamed lightweight soil.
Topology Optimization of Minimum Compliance for Continuous Fiber-Reinforced Polymer
Authors: Yang Jiaxi , Ye Hongling , Dong Yongjia 
Published: August 2023

Abstract
Continuous fiber-reinforced polymer (CFRP) has been paid more attention to due to its advantages of high strength, high stiffness, and lightweight. However, it is challenging for topology optimization to achieve CRRP structure design. A topology optimization (TO) model with minimizing structural compliance under volume fraction constraint is established based on the independent continuous mapping (ICM) method. The continuous fiber angle optimization (CFAO) method solves the fiber orientation. Meanwhile, the local optimal solution problem caused by the CFAO method is greatly avoided by the direction of principal stress. The effectiveness of the method is verified by classic numerical examples. This paper has a significant reference for the TO design of CFRP structure.
Effects of irregular pores on the shear properties of the plane
Authors: Wang Xiaoyu , Liu Liu 
Published: August 2023

Abstract
Through section analysis and optical microscope observation of thick-section composite materials, it is found that there are significant differences in pore micro-characteristics of samples with different thicknesses. It is pointed out that the difference in pore micro-characteristics in the composite matrix is one of the reasons for the change in the interlaminar shear strength of composite materials. In this paper, irregular pore profiles are obtained through image processing, and the parameters to quantitatively characterize the microscopic characteristics are proposed. A randomly generated three-dimensional representative volume element (RVE) model including fiber, matrix, fiber/matrix interface, and pores. The effect of irregular pores with different sizes and distributions on the interlaminar shear strength of composite materials is given. The RVE numerical analysis results show that the interface failure between the fiber and the matrix near the pore causes damage. At the same porosity, the shear strength decreases with the increase of the maximum pore size. At the same time, the porosity concentration also has a significant effect on the interlaminar shear strength of thick section composite. The numerical results verify that the influence of pores on the interlaminar shear properties of thick-section composites is related to the microscopic characteristic parameters of pores.
Flexible PLA/MWCNTs-PDMS Based Hybrid Nanogenerator for Biomechanical Energy Harvesting
Authors: Liu Yi , Lv Ruyue 
Published: August 2023

Abstract
With the development of technology, self-powering devices by harvesting bioenergy is an efficient way to achieve sustainable system operation. In this paper, we fabricated a flexible hybrid nanogenerator (HNG) based on multilayer nanocomposites, innovatively using biocompatible Polylactic acid (PLA) as piezoelectric material and multi-walled carbon nanotubes (MWCNTs) and polydimethylsiloxane (PDMS) as triboelectric material. A simple method was used to prepare the MWCNTs/PDMS films with surface microstructure. By coupling the triboelectric effect and the piezoelectric effect, a 3 cm × 3 cm HNG can generate an output of 80 V and 125 nA under a pressure stimulation of 20 N. Furthermore, due to the good flexibility and biocompatibility of our device, we can use it to harvest human energy.
Research on the Hydraulics of Microfluidics Bifurcation
Authors: Lin Yao , Cheng Xiaofang , He liqun 
Published: August 2023

Abstract
Microfluidics is a fluid-based manipulating technology for particle assembling or/and chemical reaction on microscope scales, where the viscous stress of fluid is more significant than its inertia. In microfluidics chips, the viscous stress can be determined by the layout of channels, and at design, one can lay out the viscous stress in terms of the hydraulic resistance of straight channels. Here, we carry out a numerical study on the hydraulic resistances of junctions of straight channels, and we manage to understand the bifurcations in particular in views of straight and side branching.
Experimental study on cleaning efficiency of independent traveling solar panel cleaning machine
Authors: Zhu Yongchao , Chen Yanwei , Li Qi , Ma Weifeng 
Published: August 2023

Abstract
As a kind of clean energy, solar energy plays a great role in helping China achieve the “double carbon” goal. However, dust cover will greatly affect the power generation efficiency of solar panels. In order to solve this problem, based on the self-designed independent traveling solar panel cleaning machine, orthogonal experiments were carried out, to study the influence of factors such as the no-load rotating speed of the roller brush, the flow rate of the front water spray component, the flow rate of the rear water spray component and the nozzle type on the improved value of the cleanliness after cleaning. The experimental verification of the optimal parameters of the power generation was also conducted. The results show that the nozzle type has the greatest impact on the cleaning effect, followed by the spray flow of the spray components on both sides of the roller brush. Taking the cleaning effect as the optimization index, the water mist nozzle should adopt the wide-angle small-aperture fan-shaped nozzle (11004 type), the cleaning water flow on both sides of the roller brush should be controlled at 500 L/h, and the rotational speed of the roller brush off the plate should be controlled at 200 rpm. If it is necessary to pay attention to water conservation, the water spray flow of the two ways can be moderately reduced. The optimized cleaning efficiency parameter configuration scheme has an obvious cleaning effect on the photovoltaic array, which can greatly improve the power generation of the array.
Study on the Coordination Effect of Different Flexible Polybenzimidazoles with Copper Ions
Authors: Liu Tianmeng , Wang Yan , Hu Zuming 
Published: August 2023

Abstract
High-performance polymers such as polybenzimidazole (PBI) can have their thermomechanical properties greatly enhanced by the coordination of their rich imidazole groups with metal ions. The molecular chain’s flexibility influents on metal ion coordination greatly. In this paper, PBI with different chain flexibility was synthesized by varying the number of ether bond-containing monomers during the polymerization process. Rheological characterization of supramolecular networks obtained by coordination of different flexible PBI with copper ions was performed to explain in depth the effect of molecular chain flexibility on the reaction between copper ions and imidazole groups. The enhanced mechanical properties of the copper ion coordination polymer networks were compared to provide insight into the enhanced toughening mechanism of PBI with metal ion coordination.
Interfacial Structural and Dynamical Properties of [BMI+] [PF6
-] Ionic Liquids on the MXene Electrode: A Molecular Dynamics Simulation Study
Authors: Xu Chenxuan , Zheng Wenjin , Wen Binbin , Chen Xiaolin , Hua Jing , Wang Xinhao , Qian Xu , Si Linjun , Chen Gang , Yang Huachao 
Published: August 2023

Abstract
Two-dimensional MXene nanomaterials are attracting more and more research interests as electrodes in energy storage applications. In this work, the interfacial structural and dynamical properties of solvent-free ionic liquids ([BMI+] [PF6
-]) on the MXene electrode are investigated using molecular dynamics simulation. Multiple alternating structures of [BMI+] cation and [PF6
-] anions on the MXene surface are observed. Interestingly, the ion diffusion coefficients are remarkably reduced (by 30~40%) in the interfacial Helmholtz layer. Importantly, an asymmetric bell-shaped differential capacitance profile with a maximum capacitance of ~7.04 μF/cm2 is observed. This is chiefly correlated with the structural properties of counterions rather than coins in the interfacial areas.
Modulation Technique Design of An Improved Zero Common Mode Voltage (CMV)
Authors: Guo Yujing , Zhang Junhuai 
Published: August 2023

Abstract
Voltage imbalance of neutral-point and CMV are hot issues in the research of three-level inverters. This paper first introduces the three-level topology of the neutral-point clamped (NPC) inverter. Aiming to eliminate CMV of three-level NPC and balance the voltage of the neutral point simultaneously, a virtual space vector pulse modulation (VSVPWM) strategy is proposed. Virtual voltage vectors of this strategy are composed of 3 medium vectors. The voltage of the neutral point is balanced since the average current of the neutral point is 0. Therefore, the balance index is introduced to redefine virtual voltage vectors, so the voltage of the neutral point can recover quickly when the capacitors’ voltage of the dc-link is imbalanced.
A carbonized coconut husk for supercapacitor electrode
Authors: Chu Ruixia , Tan Shiwei , Qiao Yi , Fu Wenjun , Zhang Kesong , Zhu Peidong , Liu Dongying , Huang Wanyou 
Published: August 2023

Abstract
As a new environment-friendly green device for energy storage, supercapacitor has been favored for its advantages of long service life and huge power density. As the material produced electrode of double-layer supercapacitors, much attention are given arise to carbon materials owning to their wide source, low price, environmental protection and other characteristics, especially biomass-based carbon materials. In this paper, coconut husk was used as raw material, which was carbonized by common hydrothermal pre-treatment and high-temperature pyrolysis carbonization. The materials obtained under different reaction conditions were tested in three-electrode system. The electrochemical tests implied that the carbonized coconut husk has the best energy storage characteristics when the pre-treatment time was 24 h and the activator was KOH. This study explored a carbon electrode derived by a new raw biomass material for energy storage in supercapacitors.
Photoelectric properties and persistent photoconductivity of GaN-based ultraviolet photodetectors
Authors: Yue Zhongyu 
Published: August 2023

Abstract
Persistent photoconductivity deeply affects the performance of the photodetector, and has been studied in a variety of semiconductor optoelectronic devices. In this work, AlGaN/GaN metal-heterojunction-metal (MHM) ultraviolet (UV) detectors and GaN metal-semiconductor-metal (MSM) ultraviolet detectors were prepared using transverse Schottky contacts, and characterized at different temperatures, light intensity and bias voltage. The two-dimensional electron gas (2-DEG) at the Schottky heterojunction of AlGaN and GaN is used to generate high-speed electron mobility, which significantly improves the response speed and responsivity of photogenerated carriers. Under the illumination of 365 nm center ultraviolet light with an intensity of 4.4 mW/cm2, the photocurrent can reach 434 μA-MHM and 38 μA-MSM (25 °C), and the attenuation rate increase by 2.8 times, 5 times and 3.7 times with temperature (25 °C-250 °C), bias voltage (5/10/15 V), and light intensity (0.33/1.1/4.4 mW/cm2), respectively, and the attenuation rate reaches 50∼80 times.
Scaling Mechanism and Permeability Evolution of Sandstone Reservoir
Authors: Lv Fei , Chen Hongnian , Tan Xianfeng , Liu Xiao , Zhang Fan 
Published: August 2023

Abstract
Knowledge of scaling mechanisms and the permeable behavior of rocks is highly important for geothermal energy development. In this study, the sandstone was soaked in a solution with the same chemical composition as geothermal water in Linyi City, Shandong Province. Permeability tests, scanning electron microscope tests, and nuclear magnetic resonance tests were performed on sandstone samples after different soak times (0, 30, 60, and 90 days) and temperatures (25 and 85 °C) to characterize the changes in microstructure and permeability properties. In addition, the changes in ion concentration in chemical solutions were compared. The results show that the wet mass and porosity of sandstone increase with the increase of soak time (0-70 d), and then entered the stable periods (70-90 d). As the soaking time, the medium and large pores inside the sandstone are transformed into small pores. The permeability of sandstone shows an overall decreasing trend, with the maximum decline when the soaking time is 30 d. At 25 °C, the scaling behavior is mainly involved by Ca2+, but at 85 °C Mg2+ is also involved in the scaling behavior. The scaling mechanism becomes the joint participation of Ca2+ and Mg2+. The results of the PHREEQC simulations are almost the same as the laboratory test results, indicating that sodium feldspar, potassium feldspar, and chlorite are generated slowly during the fouling process.
Preferred Selection of Fractured Sweet Spot Section for Horizontal Shale Oil Well in West 233 Area
Authors: Liu Zhidi , Xie Zhenglong , Wang CiXun , Zhang Leizhao 
Published: August 2023

Abstract
Six parameters, which can effectively reflect the reservoir quality and the completion quality, have been selected, including the sand structure index, the physical parameters, the oil content index, the brittleness index reflecting, the stress difference coefficient and the fracture pressure. The evaluation index of fracturing sweet spots in shale oil horizontal wells was constructed, and the fracturing sweet spot selection criteria for shale oil horizontal wells in the study area were established. Combined with dynamic production data, the fracturing sweet spots were classified into Class I (high quality reservoir), Class II (secondary reservoir) and Class II (non-fracturing sweet spot), which provided technical support for the preferential selection of fracturing formations in shale oil horizontal well.