bluuebunny/crossref_metadata_2025_split huggingface dataset:
Green synthesis of silver nanoparticles from anthocyanin extracts of purple cabbage (brassica oleracea var capitata) and its characteristics for dye-sensitized solar cells (DSSC) application
Authors: Arsyad Waode Sukmawati , Cassandra Febryanti , Asharuddin Muh , Suere Suryani , Ramadhan La Ode Ahmad Nur , Hidayat Rahmat 
Published: June 2022

AbstractWe extracted natural dye from purple cabbage (PCE) and green-synthesized the silver nanoparticle (AgNPs) from this extract for the light-harvesting material in DSSC. The anthocyanin was extracted with the maceration method for 24 hours with solvent variation (distilled water (DW), ethanol and methanol), followed by synthesized AgNPs. From FTIR, we found that the absorption area of anthocyanin at 1629 cm−1correspond with stretch vibration of C=O shifted to 1608 cm−1in AgNP, indicates the presence of amine group or flavanones group. The PCEs showed an amorphous non-Bragg diffraction peak at a range of (15-25)°. AgNP’s diffractogram showed an intense peak at around 37.94° originates from Ag. Visible light range absorption observed, peaked at (421, 480, 550, and 966) nm, (415 and 544) nm, and (409 and 544) for PCEs in DW, ethanol, and methanol, respectively. The peak at 550 nm that comes from aglycone group in anthocyanin would be disappeared in the AgNPs that was made by dissolving AgNO3in DW, ethanol, and methanol. The energy gap was (2.37, 3.00, and 3.03) eV for PCEs in DW, ethanol, and methanol, respectively, and (3.20, 3.30, and 3.31) eV for AgNPs. The reduction current originated from the Faradaic process (dark and irradiated condition) was detected in the extract with DW and ethanol as solvent, while it was not noticeable in methanol. This reduction current was detected for all solvents in AgNP positioned at a positive voltage of 0.2V. To be used as a light absorber in DSSC, one must choose the dye solution with the smallest energy gap without or small reduction current.
The improvement design of two-colour pyrometry for pulsed laser deposition system
Authors: Liang T. , Ningsih K. , Mackenzie J. I. , Prentice J. , Yasin M. 
Published: June 2022

Abstract
In this work, we develop a digital pyrometry with an automatic control system. A two-colour pyrometer is applied to measure the substrate surface temperature in the pulsed laser dep-osition (PLD) system. A digital computer and two-colour photodetector are coupled to obtain the substrate surface temperature and the output signal from the respective detectors with high accuracy. These sets enable us to determine the substrate temperature during the process of deposition remotely and potentially allow us to develop control routines for maintaining a constant temperature throughout the process. The designed system has a broad spectral response range from 0.32 to 1.7μm and achieves a deficient full-scale temperature error of <1.8°C. Factors affecting the temperature measurements are studied to identify the sensor limitations, such as possible damage on the two-colour photodetectors, spectral losses, responsivity, and the distance between the photodetector end to the substrate. Finally, this pyrometric system is applied in the PLD process to maintain a stable substrate surface temperature.
Refractive index sensing performance of a bimetallic core-shell nanotube
Authors: Azwar Azrul 
Published: June 2022

Abstract
The sensing performance of a bimetallic core-shell nanotube is studied theoretically based on the theory of TE-polarized light scattering by a multilayer infinite cylinder. The nanotube consists of a metallic core and a metallic shell with the analyte is inserted between the core and the shell. It is found that the absorption efficiency spectra of a bimetallic core-shell nanotube exhibit three resonance peaks correspond to the dipole, quadrupole and sextupole mode. As the refractive index of the analyte increased from n2
= 1.33 to n2
= 1.45, these resonance peaks are linearly redshifted. By calculating the figure of merit (FOM), it is found that the high sensing performance with FOM > 100 could be achieved. The dipole mode exhibits a higher sensing performance as compared to the other modes. Finally, the sensing performance is very sensitive to variations of the geometrical parameter and the background medium of the nanotube.
Application of ipv6 technology based on improved ant colony algorithm in digital twin watershed
Authors: Lingming Meng , Fei Peng , Peng Zhang , Shuang Jiang , Yun Chen 
Published: June 2022

Abstract
With the Internet of Things, the rapid development of the Internet and the rising number of online users, IPv4 addresses used today have been allocated, and IP addresses have become scarce, unable to meet the growing demand for IP addresses. This paper provides a basic theory of big data analysis and research on social relationships and sense of location information based on the relevant information of a model and functions of the business processing layer, transmission layer, information processing and application layer extracted from the network and social material basis. The results show that this method has better fitting and prediction effect by using ipv6 technology of ant colony algorithm. It lays a foundation for further research in the future. It can be seen from the experimental results that the performance of the algorithm decreases obviously with the increase of feature proportion. This is because the increase of feature proportion makes the algorithm select redundant and irrelevant features, resulting in the decline of classification accuracy. The results show that the accuracy of eACO-GA algorithm is 0.98 to determine the optimal feature selection ratio of the current data set, and better classification results can be obtained.
The influence of wind turbine blade rotation on anemometer
Authors: Zhou Yaqiang , Tian Lizhu , Jiang Zhiwen , Li Yapeng , Wu Zhaohe , Qi Chenglong , Gou Yanxu , Xu Yonghe , Du Dayu , Wang Bao , Wu Yuan , Feng Wei , Li Peng 
Published: June 2022

Abstract
In this thesis, numerical simulation modeling is used to calculate the influence of wake on the wind speed anemometer. The input conditions include wind speed, wind direction, wind density, etc., and a matrix database is formed, which is used to call data with lidar. Evaluation of the actual deviation of wind speed and direction at different wind speeds. Evaluation of the actual deviation of the anemometer under different installation positions. Through the results of numerical analysis, improve the wind speed and direction collection accuracy of the unit.
Design of Ducted Fan Based on Optimal Circulation Distribution
Authors: Zhang Zilun , Bao Mingmin , Qiao Nanxuan , Ma Tielin 
Published: June 2022

AbstractThe ducted fan lift system has been widely used in vertical takeoff and landing (VTOL) unmanned aerial vehicle (UAV). According to the overall design requirements of a VTOL UAV, based on the optimal circulation distribution condition without blade element drag and combined with strip theory, the blade torsion angle distribution and chord length distribution are given. The parameters of ducted fan are designed, and the preliminary design of ducted fan lift system of this UAV is completed. The aerodynamic characteristics of the isolated fan and the ducted fan are compared by numerical simulation method, and the thrust characteristics of the ducted fan at different flight speeds are calculated. The results show that the duct increases the induced velocity at the propeller. Compared with the isolated fan, the power load and hover efficiency of the ducted fan are increased by 36.8% and 36.3% respectively. The hovering efficiency of the ducted fan designed by this method reaches 83%, which meets the design requirements and proves the effectiveness of the design method.
Numerical investigation of the aerodynamic interference in 2-aircraft formation flight
Authors: Cui Xingda , Yu Yonggang , Ma Shuai , Xiao Zhongyun , Zhang Lu , Liu Fang 
Published: June 2022

Abstract
Due to obvious reduction in drag, formation flight attracts wide attention of major powers in the world. Based on wild geese flying in a ‘V’ formation, a formation composed of two flying-wing aircrafts is designed. The aerodynamic interference in 2-aircraft formation flight is studied by CFD. Results show that 2-aircraft formation flight has little impact on leading aircraft, but has an evident impact on following aircraft. At the same AoA, the effect of increment in lift and reduction in drag of following aircraft is large. As considering the balance of gravity and lift, the reduction in drag of following aircraft is much larger, that is up to 25.1%. Under the aerodynamic interference effect, the following aircraft has a nosedown pitching moment increment, and becomes lateral static instability, which is opposite to the characteristic of solo flying-wing aircraft. The aerodynamic interference mainly comes from upwash flow induced by wingtip vortex of leading aircraft, which reduces the actual AoA and induced drag of following aircraft, and changes the lift distribution of both sides of following aircraft.
Research on dust suppression technology of fully mechanized mining workers by section control of airflow
Authors: Chen Fang 
Published: June 2022

Abstract
Taking the 20106 fully mechanized mining face of Wangjialing coal mine as the engineering background, this paper analyzes the action relationship between the dusty air flow and fresh air flow formed by the coal caving and dust production of the fully mechanized mining machine, and through the establishment of mathematical model and field test, the best matching parameters of the relative position between the axial and radial air outlet of the segmented air control and dust control system and the head-on of the working face are obtained. The field application shows that after the optimization of the parameters of the wind and dust control system, the dust reduction efficiency of the total dust concentration at the driver’s position and each transfer point can be increased by about 80%, and the dust reduction efficiency at the driver’s position can reach 91.8%. The high concentration dust is controlled within 2m in front of the work, which can prevent the escape and diffusion of dust to the rear, and the working environment is significantly improved.
The experimental study of converging slot-holes (consoles) with different transition surfaces
Authors: Huang Ying , Wang Hao , Peng Can , Zhang Jingzhou 
Published: June 2022

Abstract
In order to study the effect of consoles with different transition surfaces on film cooling performance, four kinds of consoles with different transition surfaces were designed. Under the same boundary conditions, a series of experimental studies were carried out under two typical blowing ratios. The experimental results show that whether under M=0.5 or M=1.5, compared with the reference case, the console with anti-S-shaped transition surface has the best spatially-averaged adiabatic film cooling effectiveness (ηad,av
), and the ηad,av
is improved by 7.6% and 6.6% respectively. Meanwhile, the discharge coefficient (Cd
) is decreased by 2.6% and 2.2% respectively.
Causes and troubleshooting of high bearing bush temperature of a nuclear power steam turbine
Authors: Li Shuaishuai , Qu Tianzuo 
Published: June 2022

Abstract
As an important part of the steam turbine unit, once the temperature of the bearing bush rises abnormally, it will not only reduce the application performance of the bearing itself, but also affect the normal operation of the whole unit, resulting in shutdown accidents. Aiming at the problem of abnormal temperature rise of bearing bush of nuclear power steam turbine, combined with the operation and maintenance of the unit, the real cause of high bearing bush temperature is clarified, and then targeted treatment measures are taken to solve the problem, which is beneficial to ensure the safety of the unit.
Comparative experimental study on dynamic characteristics of bubble microlayers in small channel flow boiling and pool boiling
Authors: Shen Zhongxiang , Gao Ming , Dong Wuhan , Zhang Lixin 
Published: June 2022

Abstract
The microlayer present at the bottom of the bubble plays a very important role in heat transfer during nucleation boiling. In this paper, the dynamic characteristics of microlayer at the bottom of boiling bubble in a small channel were studied by laser interferometry method and high speed camera, and the results were compared with pool boiling experiments. The results show that the bubbles have an obvious tendency to slip in the flow boiling. The microlayer interference fringe is deformed and no longer a complete Newtonian ring. By analyzing the thickness distribution of microlayer in different directions in flow boiling and the change of micro-contact angle in the flow direction, it was found that the micro-contact angle in the flow direction became larger with the growth of bubbles.
Design and analysis of a new heavy oil pump based on CFD
Authors: Sun Yi , Meng Fanxiang , Pan Lichao , Wang Xu 
Published: June 2022

Abstract
At present, submersible electric pump is the main oil production equipment in the world’s oil fields. Because the pump is tested with clean water as the medium when it leaves the factory, it can not be widely used in all oil fields. In this paper, a prototype submersible electric pump is improved and designed according to the actual working conditions, and a new heavy oil pump is obtained, which can be widely used in heavy oil Wells. The static pressure distribution and velocity vector distribution under the actual working conditions were simulated by CFD, and the feasibility was verified. It provides theoretical basis and technical guidance for solving the adverse effect of high viscosity produced liquid on pump, and has certain guiding significance for oilfield pump selection. So as to effectively save electricity and rationally exploit energy.
Optimization of Dual Unloading Grooved Piston Pump Distributor Based on Penalty Function Method
Authors: Song Yuning , Han Liang 
Published: June 2022

Abstract
According to the problem of noise caused by fluid pulsation in the piston pump, and related to the opening form, position and size of damping slot on the flow plate, a new type of distribution disc with double V discharge slot is designed again. Then CFD simulation software is used to simulate the design of the flow distribution disc into the piston pump. Finally, through simulation, it is concluded that the width of the triangle slot of the distribution plate is about 10°, the slope angle is about 12°, and the diameter of the unloading hole is about 0.8mm. When the diameter of the hole in the unloading hole is about 1.5mm, the flow curve is the smoother, and the pressure is the smoothest. Force shock and noise are also minimized at this time.
A new unstructured hybrid mesh generation method based on BP-ANN
Authors: Lu Peng , Wang Nianhua , Lin Yi , Zhang Xiaorong , Wu Yadong , Zhang Hongying 
Published: June 2022

Abstract
The automation and intelligence of grid generation are still bottleneck problems in computational fluid dynamics. This problem can be solved by generating anisotropic quadrilateral by advancing layer method and isotropic triangular mesh by advancing front method. However, the advancing layer method needs to calculate the advancing direction, step size, a correction factor of the concave and convex area, so the automation level and efficiency of grid generation need to be improved. To solve the above problems, a hybrid grid generation method based on BP-ANN is proposed. The grid data generated by traditional methods are learned by a neural network, and the neural network can predict the above key parameters. Finally, a mesh generation example of 30P30N multi-element airfoil shows that the proposed algorithm can effectively improve the adaptability, efficiency and quality of hybrid mesh generation.
Research on Influence Factors of Fluid-induced Force in labyrinth liquid Seals for pump
Authors: Chen Pingwei , Wang Tong , Ma Wensheng , Wang Tianzhou , Cao Rui 
Published: June 2022

Abstract
A 3D model of straight-through labyrinth liquid seal for water pump was built to analyse the fluid-induced forces. We found that the eccentricity and pressure difference have great impact on both the tangential force and the radial force. The tangential force increases along with the rotating speed. When tooth hight is Th=2.4mm, the tangential force comes to the minimum. When tooth width Tw =2.0mm, the radial force comes to the maximum. The tooth numbers have a great influence on the fluid-induced force. The more number of sealing teeth will cause the instability the sea.
Dynamic Simulation Analysis of Aircraft Hydraulic Pipeline System under Different Pressure
Authors: Liao Zhenhua , Zhai Guangjie , Tang Jie 
Published: June 2022

Abstract
The hydraulic system is very important in the aircraft structural system, but the hydraulic pipeline is prone to cracks or even breaks due to vibration problems during system operation, causing major hidden dangers to flight safety. Using ANSYS Workbench to carry out modal analysis and harmonic response analysis of pipelines, the influence of different inlet pressures on pipeline vibration under pulsation excitation is compared and analyzed, which provides theoretical guidance for pipeline vibration research.
Numerical Simulation on Environmental Capacity Assessment in Sanmen Bay, China
Authors: Yao Yanming , Zhu Jiahao , Li Li , Wang Jiachen 
Published: June 2022

Abstract
Estuarine environmental capacity is the foundation for coastal biological diversity and self-purification capacity. Hence, studies on the marine environmental capacity (MEC) are the foundation for the total discharge control and water quality improvement of land-based pollutants. In the article, A calibrated two-dimensional hydrodynamic model was used to study the environmental characteristics of Sanmen Bay. The model results were used to estimate the environmental capacity of the bay. Taking the pollution problem in Sanmen Bay as an example, the method of response factor, the sub-unit control method, and the phased control method were used to estimate the environmental capacity, pollutant amounts, and the pollutant reduction in the bay. The concentrations of COD, inorganic nitrogen, and acid salt in Sanmen Bay are spatially varied, with higher values occurring in the western part and in the inner bay. The half exchange time of the whole bay is about 23 days, and the exchange time of 95% water body is about 60 days. The evaluation of MEC can not only provide technical support for the offshore aquaculture industries but also provide a scientific basis for the total control of terrigenous pollutants in coastal cities in Southern Zhejiang Province.
An analysis of the perturbation error bounds for singular and eigenvalues of diagonally dominant matrices
Authors: Li Jiangjiang , Liu Tianhua 
Published: June 2022

Abstract
In this paper, we investigate the error bounds of singular values and eigenvalues for diagonally dominant Hermite matrices when the matrix on its off-diagonal entries and on diagonally dominant part is perturbed with bound ε. Our results show that not only is the bound independent of the condition number of the matrix, but the matrix itself need not be symmetric positive definite. Furthermore, the bounds are applicable to both the eigenvalue and singular value of the matrix and can be used in generalized eigenvalue problems.
Convergence Analysis of EM Method in BSM Option Pricing Model
Authors: Cheng Qianmu , Yang Yuxi , Zhang Ling , Wu Delin 
Published: June 2022

Abstract
In this paper, the EM method is applied to the BSM option pricing model. The convergence of the numerical solution of the model is analyzed. Firstly, the application background and research significance of the model are given. Secondly, the convergence analysis of model and numerical solutions is presented. Finally,the consequences are connected to a viable illustration to confirm the results.
Explosion Yield Estimation of Multi-Ground-Medium-Mixed Site
Authors: Zhang Liangyong , Xiao Weiguo , Li Xin , Hu Xiaolin , Yin Wenjun , Li Pengyi , Tang Shiying 
Published: June 2022

Abstract
The seismo-acoustic analysis approach, which is based on the fusion of acoustic and seismic data, is an extremely effective way of monitoring the yield of explosions over a long distance. To address the problem of estimating the explosion yield at a multi-ground-medium-mixed site (abbreviated as mixed site), this article derives the general explosion yield prediction forms of acoustic model and seismic model, establishes the inversion method for explosion source parameters at mixed site by introducing the ground medium amplification factor, analyzes the inversion accuracy by using experimental data, and discusses the amplification effect and the influence of different scaling relationships. The experimental results indicate that the dispersion of the acoustic impulse relative to the overpressure decreases with distance and the linear relationship of acoustic impulse is better on a logarithmic scale, whereas the vertical component of the first peak of the seismic particle velocity and displacement, as well as the radial-vertical-tangent vector sum, exhibit a good linear variation law over a certain range on the logarithmic scale. The results of the source parameter inversion demonstrate that when the amplification factor is introduced, the inversion of the explosion source parameters of the mixed site has a high accuracy for yield estimation; however, when only single hard-rock media is considered, the inversion of the explosion source parameters produces large errors. The results of the amplification effect and scaling relationship analysis indicate that geological amplification has a substantial effect on the explosion source parameter inversion results, and that the data dispersion degrees of Sachs and KG85 scaling relationships are essentially identical.
Scale-free and small-world properties in an incompatibility hierarchical network
Authors: Wang Min. , Tian Da Ping. 
Published: June 2022

Abstract
In accordance with a particular iterative method, an incompatibility hierarchical network is introduced and the topological features of the network is investigated, It contains the degree distribution, diameter, clustering coefficient, second moment of distribution and degree correlations. The incompatibility hierarchical network is a simultaneous small-world, scale-free, assortative and divergent, which makes it possible to research the complexity of some real networks.
Simulation Analysis of Vibration Characteristics of the Submerged-propeller Shaft Coupling System
Authors: Tan Yuhang , Peng Weicai , Shen Lijiao , Xing Junhua 
Published: June 2022

Abstract
The vibration characteristics of the submerged-propeller shaft coupling system are studied in this paper. Firstly, Based on the fluid structure interaction theory on acoustics wave equation, the vibration analysis model of the propeller-shaft system under water is established and computed. And the vibration characteristics of coupling system is analysed by comparing the shaft system and the submerged-propeller system. The results show that the natural vibration of the coupling system presents complicated propeller-shaft strong or weak coupling characteristics. Comparing the natural vibration and frequencies of the shaft system and the submerged-propeller system, all of the coupling system modes are corresponding to the shaft system or the submerged-propeller system in low frequency range. And there is strong transverse coupled vibration of coupling system near the propeller’s 1st-order transverse vibration frequency, which appears as propeller’s 1st-order transverse vibration coupling shaft’s 2nd-order transverse vibration. That indicates the strong transverse coupled natural vibration of the coupling system is easy to be excited near the low order natural frequency of propeller. Which may cause propeller’s transverse excitation force to be easily transmitted to the hull through the bearings under non-uniform flow, resulting in the severe vibration of the hull stern.