bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and Research on the Hinged Cover of the Fuselage of Civil Aircraft
Authors: Gou Pengpo 
Published: January 2021

Abstract
Due to the complexity of aircraft interior system, some systems need to design components installed in the fuselage, which will open in the fuselage on the formation, at the same time as the aircraft aerodynamic design requirements, the system must be in the form of the opening cover is closed, so in the design of the fuselage flap design system is particularly important. This paper mainly introduces a hinged cover in common design points and design points of cap shape.
Error analysis of new 3UPS_UP parallel mechanism
Authors: Chen Yu , Li Kaiming 
Published: January 2021

Abstract
A new mechanism based on composite ball hinge is introduced. Since the structure of composite ball hinge is inconvenient to consider the attitude of moving platform, the ball center is set as the reference point to simplify the kinematics solution. The Jacobian matrix and error analysis model are derived. The effect of the bar length error and the initial position error of the moving platform are analyzed emphatically, and the distribution law of different plane errors is basically consistent, and the bar length error direction has certain influence on the position error. Through simulation analysis and numerical calculation, the rules are analyzed, which lays a foundation for improving the mechanism performance and further research.
Study on Moving Strategy of Internal Mechanical On-Line Balancing System
Authors: Zhou Huimin , Wang Zhan 
Published: January 2021

Abstract
Mechanical balancing system driven by the motor can cause wrong adjustment and long balancing time in the controlling process, which will result in lower accuracy of rotation. In order to solve this problem and achieve more efficient online dynamic balance, the optimal moving path of the built-in mass block of balancing device can be determined by us. Four kinds of moving paths for mass block are designed by using for balancing to make experimental verification of spindle dynamic balance movement. By comparing experimental results of balance accuracy and balance efficiency, the optimal dynamic balancing strategy is determined. The results show that the designed moving strategy is reasonable, and the moving optimized path can carry out more accurate control precision and shorter adjustment time to achieve the expected effect. The better control strategy of dynamic balance lays the foundation for the high-precision operation of the spindle system.
The effect of spot size on quality factor of Laser Doppler Velocimeter
Authors: Xi Chongbin , Nie Xiaoming , Huang Rong , Zhou Jian 
Published: January 2021

Abstract
Quality factor is an important evaluation index of Laser Doppler Velocimeter (LDV). In order to study the effect of spot size on quality factor, the effects of signal light intensity and transit time on the quality factor are discussed theoretically. In addition, the distribution of quality factor of LDV was measured and examined. Theoretical analysis and experimental results demonstrate that: Due to the symmetry of Gaussian beam, the distribution of quality factor is symmetric. Furthermore, the light intensity of Doppler signal at the waist spot of Gaussian beam is the largest while the transit time of moving particles diminishes due to the decrease of spot diameter, causing spectrum leakage. Under the influence of both Doppler signal intensity and transit time, the distribution of quality factor appears concave phenomenon.
Effect of cut tobacco size and distribution on critical cigarette quality characteristics of “slim cigarette” processing technology
Authors: Zou Quan , Zhang Tao , Zhao Yunchuan , Chen Ran , Yang Lei , Hu Qun , Wu Jia Can , Xu Yan Qun , Pu Qian , Zhao Mei Wei , Qiu Ye , Feng Hongtao 
Published: January 2021

Abstract
To further improve the stability of quality control on the processing technology of slim cigarettes in the process of cigarette manufacturing. In this study, based on the blending formula of product A, the cut tobacco screened out by different sieves was rolled according to different proportions. The cigarette structure, physical properties, tobacco loss from cigarette-end, dust content, and density of tobacco rod were systematically evaluated. The results showed that the proportion of medium and short cut tobacco (1.0 mm ∼ 3.35 mm) ≥ 62%, and the whole cut tobacco ratio in the cigarette was less than 40%, which could effectively improve the fluctuation of slim cigarette physical properties and the distribution stability of cut tobacco in tobacco rod.
Finite element analysis of belt conveyor bracket
Authors: Zhang Ming-Yuan , Zhu Hai-Dong , Zhang Wei 
Published: January 2021

Abstract
As an important part of the belt conveyor, the triangle bracket supports the roller and carries its load. Its stability and service life directly affect the function of the conveyor, so that the conveyor system can work stably and efficiently. Due to the characteristics of the belt conveyor, such as long transportation distance and large conveying volume, there are many problems in the actual working condition of the triangle. For example, the triangle bracket bears too much load, resulting in deformation and damage of the bracket structure. Working time is too long, the yield limit of the support is reduced, and the structure of the support is seriously failed, which leads to the shutdown of the conveying system and huge economic loss of the enterprise. There are many problems in the actual production of triangle bracket, so it is necessary to analyze and study triangle bracket to solve these problems. This project takes the triangle support of a belt conveyor as an example, establishes a three-dimensional solid model of the support, conducts finite element analysis on the triangle support model with ABAQUS software, analyzes the stress-strain displacement of the triangle support under the load, and optimizes the triangle support according to the finite element analysis results.
Finite Element Analysis of Misalignment and Contact State on the Interface of Bearing Bore Under Preload Condition
Authors: Meng Zhaohang , Ma Wei , Zhou Ping , Zhang Zhenyu , Ding Ze 
Published: January 2021

Abstract
The split bearing bores of diesel engine are generally bored after tightening bolts to install crankcase and cylinder block. Machining accuracy significantly affects the contact state during sliding bearing operation, thereby reducing the service life of bearing. For effectively suppressing misalignment of interface caused by deformation of bearing bore, this paper presents finite element model and experimental measurement. The theoretical analysis and numerical calculation of interface are carried out in this paper. The finite element models of bearing bore and interface between crankcase and cylinder block are established to quantitatively analyze the deformation characteristic and contact state. The results indicate that the contact pressure of interface increases gradually with increase of the pre-tightening torque. The sliding distance of interface is positively correlated with the contact pressure of interface. Furthermore, the direction and value of the principal stress are calculated by measuring the strain of nodes around the bearing bore. Differential forces on both sides of bearing bore lead to joint surface sliding. Finite element simulation results are compared with experimental results to verify the finite element model.
Simulation Analysis of Stress Corrosion of H62 Copper Alloy
Authors: Dazhao Yu , Tong Zhang , Wentao Niu 
Published: January 2021

Abstract
H62 copper alloy is a commonly used material in engineering, and stress cracking of copper alloys has always been concerned. In this paper, a two-dimensional model of H62 copper alloy was established by COMSOL electrochemical module, and the stress corrosion of H62 copper alloy was analyzed by using measured engineering stress-strain curve. The results show that the tensile stress has a serious effect on the stress corrosion, and the excessive tensile stress will lead to the fracture failure of the contact.
Reuse of cold drink packaging based on sustainable theory
Authors: Jun Han , Chen Derun 
Published: January 2021

Abstract
In today’s society, product packaging is increasing, and more and more kinds of materials are used, and different kinds of materials also have many difficulties in the later product recycling. Each link is closely related to the environment. From the designer’s point of view, it is very important to consider the abandonment of products from the early stage of design. How to make the cold drink packaging play its residual value is to apply the sustainable theory to solve the problem.
Microstructure and mechanical properties of AlNiCuCoX high-entropy Alloy
Authors: Wei Shanjun , Huang Zhuofang , Li Anmin , Wang Yongqi , Lu Ben , Li Qiusheng 
Published: January 2021

Abstract
AlNiCuCoX (X=Cr, CrTi, CrFe, FeTi and CrFeTi) series high-entropy alloys were prepared by vacuum arc furnace. The microstructures and properties of the alloys were analyzed. The results show that the microstructures of AlNiCuCoX alloys are composed of FCC solid solution and BCC solid solution, and the number of phases formed in the alloys is far lower than that predicted by equilibrium phase law. AlNiCuCoCrTi shows chrysanthemum like microstructure, while AlNiCuCoFeTi and AlNiCuCoCrFeTi alloys shows petal-like, chrysanthemum like and reticular (intercrystalline) white microstructure. The principal element is the key factor affecting the solidification mode (hypoeutectic, eutectic and hypereutectic solidification) of AlNiCuCoX series alloys. If the interdendritic phase is not considered, AlNiCuCoCr and AlNiCuCoCrFe high-entropy alloys are solidified in the end-solid solution solidification mode. When Ti is added, the alloy is solidified in the hypoeutectic solidification mode, and the equilibrium microstructure is composed of primary phase and eutectic. The microhardness of the most alloys increased with the increase of the number of principal elements, and the hardness of AlNiCuCoCrFeTi alloys is the highest (548HV). The compressive strength and strain of most AlNiCuCoX alloys are low (especially AlNiCuCoCrFeTi alloy). Both AlNiCuCoCr and AlNiCuCoCrFe alloys have better comprehensive mechanical properties.
Research on the application of microwave expanded fine-cut heavily rolled stems
Authors: Zou Quan , Feng Hongtao , Zhang Tao , Hu Qun , He Xufeng , Wu Jiacan , Pu Qian , Zhao Meiwei , Qiu Ye , Yang Lei 
Published: January 2021

Abstract
In order to improve the adaptability of slim cigarettes blended with cut stems. In this study, we have developed the microwave expanded fine-cut heavily rolled stems. By setting the different proportions of cut stems, compared with the traditional pneumatically dried cut stems, we analyzed the application characteristics of the microwave expanded fine-cut heavily rolled stems into the slim cigarette from the aspects of blending uniformity, physical characteristics of cigarette, mainstream smoke, sensory quality. The results showed that: the microwave expanded fine-cut heavily rolled stems is conducive to the Blending Uniformity, the draw resistance stability is better than that of the traditional pneumatically dried cut stems, the adaptability in slim tobacco is better than that of the traditional pneumatically dried cut stems, the stability of tar and CO release is improved, and the overall sensory quality of the microwave expanded fine-cut heavily rolled stems is better in sensory evaluation. This study supports the application of the microwave expanded fine-cut heavily rolled stems in the slim cigarettes.
Vision / inertial integrated navigation method for quadcopter based on EKF state observer
Authors: Xu Haibo , Li Peixuan , Wen Litao , Wang Zewei 
Published: January 2021

Abstract
Quadrotor UAVs are widely used in the field of power line inspections because of their advantages such as high accuracy, strong adaptability, and strong obstacle surmounting capabilities. However, in practical applications, the autonomous navigation of the UAV still has problems such as poor anti-interference ability, insufficient accuracy and still dominated by manual control. Visual navigation is difficult to obtain sufficient information or to track feature points when there is insufficient lighting, sparse features, and large maneuver. These problems can reduce the accuracy of visual navigation. The position estimation error directly obtained by integrating the IMU data of the inertial navigation unit will gradually increase with time. A vision / inertial integrated navigation method for a quadcopter UAV based on loosely coupled extended Kalman filter algorithm is proposed in this paper. Design state observer for UAV based on extended Kalman filter. The visual/inertial integrated navigation algorithm is simulated in gazebo. Finally, an experimental platform is set up to verify the vision / inertial integrated navigation algorithm experimentally. The overall position calculation error meets the positioning accuracy requirements during power line inspections.
Hesitant Fuzzy MP Filters of R0-Algebras
Authors: Man Jiang 
Published: January 2021

Abstract
In this paper, we introduce the notion of hesitant fuzzy( correlation) MP filters, some properties and equivalent conditions are investigated. The relationships between hesitant fuzzy MP filter and hesitant fuzzy correlation MP filter is disscussed. Finally, we prove the invariance between the image and the original image of hesitant fuzzy correlation filter is studied under the premise of homomorphism.
Dispersive Model for Undular Hydraulic Jump Behind a Weir
Authors: Magdalena I , Sutjianto F J , Andrew  , Sani A , Anastasia R 
Published: January 2021

Abstract
In this paper, we investigate a suitable weir design which yields in an undular jump phenomenon using both hydrostatic and non-hydrostatic models. We solved the hydrostatic model using numerical and analytical methods. After that, we validated the output from both methods using the experimental data. In order to simulate the undular jump better, modification towards the hydrostatic model is needed. Hence, for the non-hydrostatic model, we consider the existence of hydrodynamic pressure and solved the model numerically. The outcome of this paper can be beneficial for hydraulic structures design and the management of water resources.
The Locating Chromatic Number of some Modified Path with Cycle having Locating Number Four
Authors: Damayanti M , Asmiati  , Fitriani  , Ansori M , Faradilla A 
Published: January 2021

Abstract
The locating-chromatic number was introduced by Chartrand in 2002. The locating-chromatic number of a graph is a combined concept between the coloring and partition dimension of a graph. The locating chromatic number of a graph G is defined as the cardinality of minimum color classes. In this paper, we discuss about the locating chromatic number of three types modified path with cycle having locating chromatic number four.
A Two-Dimensional Map Derived From An Ordinary Difference Equation of mKdV and Its Properties
Authors: Yuliani E , Zakaria L , Asmiati  
Published: January 2021

Abstract
The discrete modified Korteweg–de Vries (mKdV) is a class of discrete integrable systems that may be distinguished as integrable partial difference equations (PΔE) and integrable ordinary difference equations (OΔE). By considering traveling wave solutions, the OΔE mKdV can be obtained from PΔE mKdV. Meanwhile, a mapping can be constructed from an OΔE mKdV. In this paper, we will focus on producing a new map using a process (replacement), the interchange of a single parameter, and an integral and investigate its properties.
Characteristics of Bayes Estimator in the Geometric Distribution with Prior Beta
Authors: Susilo T , Widiarti  , Kurniasari D , Aziz D 
Published: January 2021

Abstract
This study aims to examine the unbiased, minimum variance (efficient), and consistent characteristics of Bayes estimator in the Geometric distribution with prior Beta. Based on the results of simulation studies it is found that the Bayes estimator in the Geometric distribution with prior Beta are symptotically unbiased estimator for values θ < 0,5 and is biased for others, are efficient for the number of samples sizes large and values θ ≤ 0,6 and not efficient for others and consistent when value θ ≤ 0,5 and inconsistent for other.
Real time epidemic modeling using Richards model: application for the Covid-19 outbreak in East Kalimantan, Indonesia
Authors: Huda M N , Sifriyani  , Fitriani  
Published: January 2021

AbstractThe coronavirus pandemic has spread to all provinces in Indonesia within a few months. Coronavirus has entered East Kalimantan province in early March 2020. The number of people confirmed as COVID-19 increased dramatically after March. In this paper, we propose a simple mathematical model to predict coronavirus cases in East Kalimantan province. We applied the Richards growth model to the active case and probable case (PDP case) curves. We used the initial parameter values obtained from China’s Jiangsu province. This means that the strategy for handling coronavirus in East Kalimantan province is assumed to be the same as in China’s Jiangsu province. We have presented the final prediction for the coronavirus pandemic over a range of periods.
Determining the Noetherian Property of Generalized Power Series Modules by Using X-Sub-Exact Sequence
Authors: Faisol A , Ftriani  , Sifriyani  
Published: January 2021

Abstract
The Noetherian property of the generalized power series module can determine in several ways. This paper uses the sub-exact sequence of modules over a ring R to determine this property. This investigation not only determines the Noetherian property of the generalized power series module but also the Noetherian property of its submodule. Furthermore, we give a construction of R[[S]]-homomorphism between the generalized power series modules.
A Structural Equation Modeling of Factors Affecting Student Motivation in Thesis Preparation
Authors: Setiawan E , Pratiwi A , Herawati N , Nisa K , Faisol A 
Published: January 2021

Abstract
Structural equation modelling is a multivariate statistical analysis technique that is used to analyse structural relationships. This technique is the combination of factor analysis and multiple regression analysis, and it is used to analyse the structural relationship between measured variables and latent constructs. The purpose of this study is to use structural equation modelling to better understand student motivation in thesis preparation and its causal determinants. The study creates a plausible structural equation model (SEM) and tests it. The data used were students’ responses of a questionnaire survey about the student motivation in thesis preparation. Based on the results of the study, it was found that the relationship between lecturer and student and the environmental conditions have significant influence to student motivation in thesis preparation.
Implementation protein sequence segmentation in AAC and DC as protein descriptors for improving a classification performance of acetylation prediction
Authors: Rizqiana A , Faisal M R , Lumbanraja F R 
Published: January 2021

Abstract
Post-Translational Modification (PTM) identification is carried out to determine the position of the PTM in protein. Acetylation in the lysine protein is one of the many types of PTM that play an important role in biological processes. In existing research, identification of lysine acetylation was developed by computational methods, using several available protein descriptors along with classification methods. Research on protein classification usually only uses the length of the protein sequence to describe the state of the whole protein, not its local state. Knowing the local state of the protein sequence will have a good effect on the classification results. To find out the situation, the protein sequence segmentation approach is done by adjacent and overlapped segments. Adjacent and overlapped segments divide the length of the protein into several segments, then numerical features will be calculated, so that information about the protein is also obtained locally. Calculation of numerical features using the Amino Acid Composition and Dipeptide Composition descriptors, then the data is classified with Support Vector Machine. The experimental results show that protein segmentation increases the performance of protein classification by 0.7-2.5%. Segmentation using adjacent and overlapped segments provides improved performance. In this research, it was found that protein segmentation affected the performance of protein classification, especially in overlapped segments.
Implementation of Fuzzy-based Model for Prediction of Thalassemia Diseases
Authors: Susanto E. R. , Syarif A. , Muludi K , Perdani R. R. W. , Wantoro A. 
Published: January 2021

Abstract
Thalassemia is known as one of the blood disorder diseases that is inherited by parents. There are several types of Thalassemia, namely as Thalassemia major, minor, and intermedia. Among them, Thalassemia major is the most dangerous and needs more attention. Generally, it can be detected since the child is one year old. Late detection of this disease can have adverse consequences and various complications. This study aims to develop a new model for the prediction of thalassemia for children. The model adopts a fuzzy-based rule. The novelty in this article is that our model has 4 outputs, namely thalassemia major, intermedia, minor and not thalassemia. In the previous article it only had 3 outputs. In this study, we intend to implement a model that we developed using a fuzzy-based approach to classify thalassemia diseases based on CBC data. This article describes how to build a model and implement it in software. We compare the test results with the opinion of pediatricians regarding thalassemia. The final results of testing 4 CBC data show that our proposed model has successfully identified the type of thalassemia.
eDonation Android Application for Used Goods Donation using Location-based Service
Authors: Pribadi R I A , Pambudi A , Ardiansyah  
Published: January 2021

Abstract
Used goods/secondhand can be found anywhere during the buying cycle. Used goods are also can be reused and even still have value. Used goods such as books, clothes, bags, shoes that are still suitable for use, can also be donated to others needy. In the current technological development, many donations have been made online. This can provide donors and social institutions in raising donations. But the donations consist only of money and are not goods. In overcoming this, the eDonation apps can help donors in donating their used goods. This application also helps social institutions in raising broader donations. By utilizing location-based services, donors can find out the location of social institutions in the vicinity, so donors can choose the location of the nearest social institution that receives donations in the form of used goods that are suitable for use.