bluuebunny/crossref_metadata_2025_split huggingface dataset:
Three-dimensional CFD modelling of urban flood forces on buildings: a case study
Authors: Viccione G , Izzo C 
Published: January 2022

Abstract
Italy is among the countries most likely to be exposed to high hydrogeological risk. The recent 2018 Hydrogeological Disruption Report by ISPRA (Higher Institute for Environmental Protection and Research) states that about 90% of Italian municipalities fall within areas with hydrogeological risk, that is where the probability of floods/landslides is high (level P3) or very high (P4) or the hydraulic hazard is of medium level. Floods are the most severe and frequent phenomena affecting landscapes, mainly if they occur in urban contexts. Urban development, if nature-based solutions are not taken into account, determines an increase in the impermeable surface, with the effect of reducing the infiltration and water evaporation, and consequently with an increase in runoff peaks and decrease of the concentration times. In this framework, the work here presented numerically analyses the effect of floods in an urban basin, in term of their three-dimensional interaction with buildings. The site under study is Cervinara, a municipality in the Campania region, Italy, hit by severe floods in 1999. Flow peaks were calculated using the VAPI procedure, a regional methodology based on two-component extreme value (TCEV) distribution. The results show that the level of exposure of the buildings, evaluated by calculating the thrust of the interacting water on the exterior walls, is influenced by the local three-dimensional kinematics.
Modular enumeration - a new method for solving discrete programming problems
Authors: Groppen Vitaly O 
Published: January 2022

Abstract
A new approach resulting in a new group of algorithms for finding globally optimal solutions to discrete programming problems with Boolean variables is proposed. It is proved that the effectiveness of this method depends only on the number of variables of the problem to be solved and of the amount of RAM of used computer. The main difference from the existing methods of implicit enumeration is in the ability for some of the modular enumeration procedures to a priori predict, solving any extreme problem with Boolean variables, the number of iterations, the gain in running time in comparison with the traditional enumeration scheme, as well as the amount of RAM used. The experimental results confirm high efficiency of the proposed approaches.
Fast and accurate control of gates for quantum hypercomputation based on coherent domains of water
Authors: Maxmilian Caligiuri Luigi 
Published: January 2022

Abstract
Quantum electrodynamics (QED) predicts that, under suitable conditions for temperature and density, liquid water can be described as a two-phases system composed by a coherent and a non-coherent phase. The first one is characterized by the formation of macroscopic regions, called “;coherent domains” (CDs), in which all the molecules are phase - correlated among them and with a self-trapped electromagnetic field that leaks out from the CDs in the form of an evanescent tail. This feature, along with the possibility for the CDs to have an excited energy spectrum, allow them to interact each other through quantum tunneling of virtual photons. We have already shown how to exploit this dynamics to realize quantum hypercomputation by using a set of universal quantum gates made of interacting water CDs. In this paper we discuss how to accurately and fast control the macroscopic quantum states of such water coherent domains, by using electromagnetic potentials to modify the phase of their wavefunctions. Finally, a possible experimental set-up designed to this aim, based on the electric version of the Aharonov-Bohm effect, is discussed.
Design of High-performance Terahertz Sensor Based on Metamaterials
Authors: Ge Hongyi , Li Li , Jiang Yuying , Li Guangming , Wang Fei , Lv Ming , Zhang Yuan 
Published: January 2022

Abstract
In this paper, a high-performance terahertz sensor is proposed. The sensor obtains a perfect narrow-band transmission spectrum at 3.842 THz with a Q value of 137 at the resonance frequency. The sensitivity reaches 160 GHz/RIU at the thickness of the substance to be measured of 10 μm, with good sensing performance. The results show that it has a promising application in terahertz high-sensitivity biosensing detection.
Wearable Sensors for Detecting and Measuring Kinetic Characteristics
Authors: Huang Zihao , Li Junan , Lian Jiakun 
Published: January 2022

Abstract
Wearable devices play an important role in our daily life. We can use it in the sports area and the medical area. This review uses many articles to introduce how to use different sensors to analyze human kinetic characteristics. This review is divided into three parts. In the first sections, we will introduce the working principle and its calculation method of the different sensors such as IMUs sensors, pressure transducers, etc. The second part will show you some research about using wearable sensors to calculate the joint data and link the data with human movement. These researches can help us stay far away from joint diseases. In conclusion, we give some suggestions about the improvement of wearable devices.
Research on precise measurement method of full parameters of spline interlocks
Authors: He Min , Du Wenbo , Gao Hongbo , Cai Dongyan , Yang Li , Li Cui , Wu Yu 
Published: January 2022

Abstract
This paper mainly introduces the types, characteristics and applications of spline, studies the high-precision measurement technology of different types of spline. Based on gear measuring instrument, optical coordinate measuring machine and coordinate measuring machine, the high-precision full-parameter measurement methods of spline. Developed countries in Europe have spline standards in the 1950s. At present, China has formed a relatively complete system of key and spline linkage standards, but the overall level is still far from developed countries. With the revision of national standards, spline coupling has been applied in more and more fields with the development of industry. It also puts forward higher requirements for high-precision detection methods. Especially for rectangular splines, there is no national calibration specification for the traceability of rectangular splines. We determine the measurement methods and parameters according to the national standards, international standards and the actual production process of the factory. We hope that we can help the factory to improve the precision of splines and prolong their working life.
Research on optimization technology based on two-dimensional packing
Authors: Ji Jun , Cui Jian , Xing Feifei 
Published: January 2022

Abstract
The problem of packing is a problem often encountered in the early stages of advanced manufacturing application field. This paper first describes the two-dimensional nesting problem, and then analyzes three optimization techniques to solve the two-dimensional nesting problem, the mathematical model and solution process of dynamic programming, knapsack algorithm and linear programming algorithm.
Optimization of the number and positions of fixture locators for curved thin-walled parts by whale optimization algorithm
Authors: Li Cheng , Wang Zhongqi , Tong Hua , Tian Shaogang , Yang Liu 
Published: January 2022

Abstract
Optimizing the fixture layout of the locating element is an important method to reduce the clamping deformation of thin-walled parts. A method for optimizing the fixture layout based on whale optimization algorithm is proposed in this paper, the number and positions of the fixtures for curved thin-walled parts are optimized. Firstly, the multi-point flexible locating tooling for curved thin-walled parts is developed based on the multi-point support technology. Then the strain energy is used to describe the deformation of the curved thin-walled parts in all directions, and an optimization model that takes the position of the locating element as a decision variable and minimum strain energy as the goal is established. Combined with the whale optimization algorithm and the parameterized finite element analysis, the optimal design of the number and positions of fixture locators for curved thin-walled parts are realized. Finally, the effectiveness of the proposed method is validated by the aircraft skin locating layout optimization, and a multi-point flexible locating and deformation measurement platform is constructed to verify the results of finite element calculations.
A grid-assisted 3D printing method for magnetically driven micro soft robot
Authors: Gao Jian , Gao Peng , Rong Weibin , Li Dongjie , Wang Lefeng 
Published: January 2022

Abstract
The magnetically driven micro soft robot is one of the research hotspots in the field of micro robots. A 3D printing method for manufacturing micro soft robots with the help of auxiliary grids is proposed. The shape flexibility of the micro soft robots manufactured by the micro 3D printing method can be improved, and internal structures composed of different materials inside the micro robots can be printed using this method. The technical details of the grid-assisted 3D printing process are introduced in this article. Micro soft robots with specific patterns were 3D printed, and the deformation and movement capabilities of the robots were verified in magnetically driven motion experiments. The experimental results prove that the grid-assisted 3D printing technology can not only manufacture magnetically driven micro soft robots, but also adjust the internal structure and motion performance of the robots.
Numerical Analysis of the Temperature Field during Single-pass Two-layers Laser Additive Manufacturing of Fused Silica Glass
Authors: Lang Ming , Ruan Xiaoli , Chen Gangrong , He Chong , Hu Rui , Cheng Yuntao 
Published: January 2022

Abstract
Laser-based additive manufacturing (AM) of glass is rare and complex, which involves highly non-linear thermodynamic problems. The temperature gradient is essential in analyzing the residual stress distribution and thermal deformation. At present, there is no accurate formula to describe the temperature field, and it is also difficult to measure the real-time temperature of the molten pool during the AM process. The numerical method in predicting the temperature field of fused silica glass laser becomes attractive. In this work, a finite element (FE) model for laser AM of quartz glass is established, and the temperature field of laser AM of quartz glass based on the principle of coaxial powder feeding is simulated by combining a moving heat source and birth-death element method. The temperature fields under different laser powers and scan speeds are investigated respectively. Results show that the peak temperature increases with the decrease of laser scan speed and the increase of laser power; The temperature of the upper layer is higher than that of the lower layer because of the heat accumulation effect; The increment rate of laser power and scan speed is set in the range of - 12.5% to 37.5% to ensure the temperature of AM region is slightly above the melting point of quartz glass. It is found that the influence of power change on the temperature field is more significant than that of scanning speed. Meanwhile, the peak temperature-dependent linearly on those two variables disused. The results provided here are instructive for subsequent laser AM of glass material including coaxial powder feeding method, powder cladding, etc.
Advanced three-dimensional graphene-based piezoresistive sensors in wearable devices
Authors: Chen Weiyuan , Huang Yanjie 
Published: January 2022

Abstract
The piezoresistive pressure sensor made with a three-dimensional (3D) structure as the core material is considered a potential precision sensor for wearable devices because of its unique advantages of simple preparation principle, low power consumption, stable performance and high signal acquisition efficiency. It has attracted the attention of many scientific researchers who are committed to realizing the high intelligence and informatization of personal devices. After the rapid development in the 21st century, this technology has made many breakthroughs and showed strong application potential in high-tech fields such as human motion detection, health monitoring and electronic skin. However, this technology is still a long way from full commercial mass production. This paper introduces the unique advantages of the 3D graphene-based piezoresistive sensor in intelligent wearable devices, summarizes several production methods and applications of this 3D graphene-based piezoresistive sensor, explores the future development trend and application prospect of this technology, and discusses the challenges and prospects of piezoresistive pressure sensor based on three-dimensional graphene.
Phenylpyrimidine-Based Iridium Complex for High-Performance Green-Yellow Phosphorescent Organic Light-Emitting Diodes
Authors: Bi Y , Zhang X Y , Li H , Wang T 
Published: January 2022

Abstract
In this work, a phenylpyrimidine-based green-yellow iridium complex, (bpp)2Ir(acac), is prepared. Tert-butyl group is introduced to weaken the intermolecular interaction and endow (bpp)2Ir(acac) with favorable physical properties. Phosphorescent device which utilizes (bpp)2Ir(acac) as the luminescent guest material displays high efficiencies (73.9 cd/A, 84.8 lm/W, 21.2%), low efficiency roll-off (from 100 to 10000 cd/m2: 5.1%), relatively low concentration sensitivity (from 5% to 12%) and very stable electroluminescent spectra (from 1 cd/m2 to maximum luminance). As a consequence of the results proved that (bpp)2Ir(acac) is a good phosphorescent material.
Effect of Heat Treatment on Preparation of Ferrite Magnetite Hollow Beads by Self-Propagating Method
Authors: Hou Yong-shen 
Published: January 2022

Abstract
The characterization results of hollow ceramic beads show that oxidant KClO3 had a great influence on the preparation of hollow ceramic beads. The morphology picture and XRD analysis showed that the surface of hollow beads without KClO3 was smooth, and the particle size analysis results show that the particle size was 10 ~ 50μm. Without KClO3, the average particle size is 28.08 μm; After adding KClO3, dense dendritic crystal structure was distributed on the surface of hollow beads, and the phase is mainly BaFe2O4, and the distribution range of hollow beads is 5 ~ 40 μm, and the average particle size is 16.02 μm° It could be inferred from the analysis that the quenching reaction is fully carried out after the addition of KClO3, resulting in a large amount of gas, reducing the volume of ceramic droplets and reducing the particle size of hollow beads.
Preparation and Particle Size Study of Cobalt Substituted Strontium Doped Lanthanum Manganate Films by Sol-gel and Heat Treatment Method
Authors: Hou Yong-shen 
Published: January 2022

Abstract
In order to study the effect of B-position element substitution on strontium doped lanthanum manganate microstructure and resistivity temperature property, the cobalt substituted strontium doped lanthanum manganate ceramic powders with La0.6Sr0.4CoxMn1-xO3 as the main component was prepared by sol gel method combined with heat treatment process at first, then the cobalt substituted strontium doped lanthanum manganate films was prepared by silk-screen printing on the Alumina ceramic substrate. The results showed that when the x value sequentially varied from 0 to 0.2,0.4,0.6,0.8, the particle size property of films would be changed by the change of the crystal structure, which was produced by the B-position cobalt substitution. It could be seen from the results that the average radius of the five powders were concentrated in the range of 16.4-19.6nm.
The impact of the solidification rate on purification polysilicon by directional solidification
Authors: Lin Tao , Duan Chun Yan 
Published: January 2022

Abstract
In this experiment, directional solidification method was used to prepare metallurgical grade silicon ingot. We have studied the solidification rate which influenced the results of the experiment. Experimental results showed that the impurities were concentrated mostly in the top of silicon ingot. It was inferred that second or more times directional solidification experiments is needed to remove the impurities. What’s more, it showed that the best solidification rate is 1.5mm/min in this study.
Hydrothermal preparation and visible-light photocatalytic activity of bismuth layer structure Na0.5Bi2.5Nb2O9 nanoplates
Authors: Tian Xiaoxia , Li Songyan , Qu Shaobo , Ma Lisi , Su Yin 
Published: January 2022

Abstract
Nanoparticles of bismuth-layered ferroelectric and photocatalytic material, Na0.5Bi2.5Nb2O9, have been prepared by hydrothermal method synthesis, the raw materials include Bi(NO3)3, NaOH and Nb2O5. The phases and morphologies of the samples are characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic performance of the Na0.5Bi2.5Nb2O9 powders were evaluated by degradation of methylene blue(MB) molecules (λ>400 nm). The results show that the phases of Na0.5Bi2.5Nb2O9 particle is pure orthorhombic bismuth layer structure at 160 °C and 10 h. The morphology of the sample is flake-like, the thickness size is 25 nm, and the edge size is 200 nm. Na0.5Bi2.5Nb2O9 sample has excellent light response performance in the ultraviolet-visible wavelength range, with a band gap of 2.55 eV, and it exhibits photocatalytic performance for photocatalytic decomposition of MB under ultraviolet-visible light irradiation. As novel of visible-light-driven photocatalysts, Na0.5Bi2.5Nb2O9 with a two-layer Aurivillius structure has a great potentially application in environment-protection field.
Study on stability of carbon residue/Sodium acetate trihydrate composite phase change material from sludge pyrolysis
Authors: Yuan Shirui 
Published: January 2022

Abstract
In this paper, the pyrolysis carbon residue of sludge adsorbed sodium acetate trihydrate(SAT) of different quality to prepare composite phase change materials(CPCM). The thermal cycling performance of the prepared CPCM was tested to determine the optimal adsorption ratio of pyrolytic carbon residue to SAT. Multiple melt-solidification experiments were performed on pure SAT and CPCM to determine the improvement effect of pyrolytic carbon residue on SAT undercooling and phase separation phenomenon. The results show that the optimal adsorption ratio of pyrolytic carbon to SAT is 1:5, the undercooling degree of the CPCM is only -2.4, and the latent heat of phase change is 216.7kJ/kg, which basically overcomes the undercooling degree and phase separation phenomenon of sodium acetate trihydrate. The composite phase change material still has high latent heat value and excellent heat storage capacity after many cycles.
Effect of PDMS Viscosity and Additive Amount of Curing Agent Solution on the Mechanical Properties of PDMS Fouling Release Coating
Authors: Yan Xiaoxiang , Li Mengyu , Zhao Mengying , Zhou Hongwei , Wang Yufeng , Ba Miao 
Published: January 2022

Abstract
The mechanical properties of PDMS fouling release coatings have a very important effect on actual use. The coating was designed and prepared to study the effect of viscosity of PDMS resin and additive amount of curing agent on the mechanical properties of the coating. The cross-linking index of the coating was used to analyze the mechanical properties of the coatings. The results indicate that the mechanical properties of the coating formed by the crosslinking reaction with a high viscosity of PDMS resin are better. Despite the different viscosity of PDMS resin, the coating has the best mechanical properties, when the mole ratio of PDMS to TEOS is 1: 18.24.
Simulation and experimental study on CO2 laser polishing quartz glass
Authors: Dai Ziruo , Chen Tao , Han Xiao 
Published: January 2022

Abstract
High quality surface can be quickly obtained by laser polishing quartz glass. With the improvement of application requirements of quartz glass, the combination of process parameters for optimizing CO2 laser polishing large area quartz glass sheet is proposed. The untreated quartz ground glass was scanned by CO2 laser. Taking the roughness as the research index value, the parameters affecting CO2 laser polishing were studied and analyzed. The transient model was established by COMSOL software to simulate the polishing process, predict the combination of polishing parameters, and obtain the temperature field change in the polishing process and the flow of quartz glass during melting. 300W continuous CO2 laser was used in the experiment. The effect of surface improvement was the best when the laser power was 300W, the scanning rate was 100~200mm/s. The micro area roughness can reach Ra=10.18nm. Then, the chemical corrosion was combined with CO2 laser polishing, and the quartz glass was corroded by hydrofluoric acid and sodium hydroxide solution, and then polished to obtain the average minimum roughness Ra=5.63nm. The research results can be put into practical industrial production, which is conducive to improving production efficiency and promote the development of laser polishing quartz glass technology.
Discussion on Surface Quality and Precision Control of Metal Materials in Machining Process
Authors: Hao Limin 
Published: January 2022

Abstract
Based on the analysis of the influence of the surface quality of metal materials on the use of machinery, this paper discusses the influence of raw material quality, technical level, residual stress, cold work hardening, machine tool machining error, cutting tool machining error, mechanical positioning error and mechanical adjustment error on the surface quality and machining accuracy of metal materials. By studying the measures such as strengthening the quality control of raw materials, reasonably selecting processing technology, controlling the processing process, reducing the original error and making error compensation, the aim is to optimize the machining environment and improve the processing quality of finished products.
Raw materials selection method based on the durability of the concrete for bridge
Authors: Jiang Yongxiang , Wang Yue , Ma Yaoju , Yu Lei , Wang Xueguang 
Published: January 2022

Abstract
To enhance the durability of the cement concrete of the bridge, C40 and C50 concretes with different raw materials have been made. A method of optimal selection method for raw materials has been put forward. For different raw materials from different plant, based on the orthogonal experimental design, certain raw materials groups are gained. By the same C40 and C50 concrete mix proportion but different raw materials groups, the specimens have been made for testing the performance of the compressive strength, carbonization and anti-chloride penetration. By range analysis, the best raw material group of the concrete with higher compressive strength, lower chloride penetration coefficient and lower carbonization depth has been selected.
Effect of Ultrasonic Rolling on Properties of GCr15 Bearing Steel
Authors: Zhang Xu , Liu Wentao , Wang Shouren , Wang Kejun , Wang Dongfeng , Liu Lei 
Published: January 2022

Abstract
The effects of ultrasonic rolling processing on the properties of GCr15 bearing steel were studied in this paper. The specimens were treated with different values of preload in ultrasonic rolling processing. The surface roughness, microhardness and rolling contact fatigue life of the specimens before and after ultrasonic rolling processing were analysed and compared. The index of power density was firstly introduced and combined with ultrasonic rolling parameters. The results show that the qualities of surface roughness and microhardness are improved after ultrasonic rolling treatment, and the friction coefficient is reduced. However, when the ultrasonic rolling power density exceeds 11.24 Gw/cm2, the grain sizes of the specimens becomes larger, which leads to the increase of the internal stress, resulting in the initiation and propagation of crack. The propagation mode of fatigue cracks changes from transcrystalline to intergranular after ultrasonic rolling treatment, reducing the performances of wear resistance and rolling contact fatigue.