bluuebunny/crossref_metadata_2025 huggingface dataset:
A proteoglycan extract fromGanoderma Lucidumprotects pancreatic beta-cells against STZ-induced apoptosis
Authors: Liang Haohui , Pan Yanna , Teng Yilong , Yuan Shilin , Wu Xiao , Yang Hongjie , Zhou Ping
Published: August 2020

The pancreatic β-cell death or dysfunction induced by oxidative stress plays an important effect on the development and progression of diabetes mellitus. Based on our previous findings, a natural proteoglycan extracted from Ganoderma Lucidum, named FYGL, could treat T2DM in vivo. In this study, we investigated the effects of FYGL on STZ-induced apoptosis of INS-1 cells and its underlying mechanisms. The results showed that FYGL significantly improved the cell viability and alleviated the apoptosis in STZ-treated INS-1 cells. Moreover, FYGL markedly decreased the intracellular ROS accumulation and NO release, and deactivated NF-κB, JNK, and p38 MAPK signaling pathways in STZ-induced INS-1 cells. Furthermore, FYGL improved the insulin secretion through inhibiting the activation of JNK and improving the expression of Pdx-1 in INS-1 cells damaged by STZ. These results indicated that FYGL could protect pancreatic β-cells against apoptosis and dysfunction, and be used as a promising pharmacological medicine for diabetes management.

Abbreviations: T2DM: type 2 diabetes mellitus; FYGL: Fudan-Yueyang G. lucidum; ROS: reactive oxygen species; NO: reactive oxygen species; NF-κB: nuclear factor kappa beta; JNK: c-jun N-terminal kinase; MAPK: mitogen-activated protein kinase; Pdx-1: Pancreatic duodenal homeobox 1
Spin-gapless and -gapped band structures of non-compensated bonding BN/Graphene bilayer
Authors: Hao Dongfeng , Xiaoyu Han , Zi Yanbo , Li Chong , Niu Chunyao , Wang Fei , Cho Jun-Hyung , Jia Yu
Published: August 2020

Magnetized graphene is a promising candidate for spintronic devices, where half-semimetallic or -semiconducting property is highly desirable. Using first-principles calculations, we show that stable ferromagnetic ordering can exist readily in non-compensated bonding BN/graphene bilayer with triangular defects (TDs) by analogizing with bonding BN/BN bilayer observed in experiment. More intriguingly, regardless of the non-compensated defect states in the gap, such spin-polarized BN/graphene bilayer exhibits spin-gapless and -gapped semiconducting band structures with quadratic and linear dispersion, respectively, depending on the size of TDs. The massive or massless electronic states of bonding BN/graphene are associated with the electron localization degree at the zigzag edges of TDs. Our findings might provide another feasible strategy to realize stable magnetized graphene and engineer its electronic and magnetic features.
Geometric uncertainty analysis of MLC tracking for lung SABR
Authors: Caillet Vincent , Zwan Benjamin , Briggs Adam , Hardcastle Nicholas , Szymura Kathryn , Prodreka Alexander , O’Brien Ricky , Harris Ben E , Greer Peter , Haddad Carol , Jayamanne Dasantha , Eade Thomas , Booth Jeremy , Keall Paul
Published: August 2020

Purpose. The purpose of this work was to report on the geometric uncertainty for patients treated with multi-leaf collimator (MLC) tracking for lung SABR to verify the accuracy of the system. Methods. Seventeen patients were treated as part of the MLC tracking for lung SABR clinical trial using electromagnetic beacons implanted around the tumor acting as a surrogate for target motion. Sources of uncertainties evaluated in the study included the surrogate-target positional uncertainty, the beam-surrogate tracking uncertainty, the surrogate localization uncertainty, and the target delineation uncertainty. Probability density functions (PDFs) for each source of uncertainty were constructed for the cohort and each patient. The total PDFs was computed using a convolution approach. The 95% confidence interval (CI) was used to quantify these uncertainties. Results. For the cohort, the surrogate-target positional uncertainty 95% CIs were ±2.5 mm (−2.0/3.0 mm) in left-right (LR), ±3.0 mm (−1.6/4.5 mm) in superior–inferior (SI) and ±2.0 mm (−1.8/2.1 mm) in anterior–posterior (AP). The beam-surrogate tracking uncertainty 95% CIs were ±2.1 mm (−2.1/2.1 mm) in LR, ±2.8 mm (−2.8/2.7 mm) in SI and ±2.1 mm (−2.1/2.0 mm) in AP directions. The surrogate localization uncertainty minimally impacted the total PDF with a width of ±0.6 mm. The target delineation uncertainty distribution 95% CIs were ±5.4 mm. For the total PDF, the 95% CIs were ±5.9 mm (−5.8/6.0 mm) in LR, ±6.7 mm (−5.8/7.5 mm) in SI and ±6.0 mm (−5.5/6.5 mm) in AP. Conclusion. This work reports the geometric uncertainty of MLC tracking for lung SABR by accounting for the main sources of uncertainties that occurred during treatment. The overall geometric uncertainty is within ±6.0 mm in LR and AP directions and ±6.7 mm in SI. The dominant uncertainty was the target delineation uncertainty. This geometric analysis helps put into context the range of uncertainties that may be expected during MLC tracking for lung SABR (ClinicalTrials.gov registration number: NCT02514512).
Study of suprathermal electron dynamics during electron cyclotron current drive using hard x-ray measurements in the TCV tokamak
Authors: Choi D , Coda S , Decker J , Cazabonne J A , Peysson Y
Published: August 2020

Suprathermal electron dynamics in real and momentum spaces plays an important role in the physics of electron cyclotron current drive (ECCD), in particular for predicting the wave driven current. In the TCV tokamak, a hard x-ray spectroscopy system equipped with digital pulse detection enables detailed studies of the creation and relaxation of suprathermal electrons. The time evolution of hard x-ray spatial profiles and energy spectra is observed utilizing a minimally perturbative ECCD modulation technique. Time-dependent Fokker-Planck modeling combined with a hard x-ray synthetic diagnostic is used to interpret experimental results and test various suprathermal electron transport models. The comparison suggests a dependency of the radial transport on the EC wave power.
Etching of GeSe2 chalcogenide glass and its pulsed laser deposited thin films in SF6, SF6/Ar and SF6/O2 plasmas
Authors: Meyer T , LeDain G , Girard A , Rhallabi A , Bouška M , Němec P , Nazabal V , Cardinaud C
Published: August 2020

Excited species, reactive neutral species and positive ions, produced during the etching of Ge, Se and GeSe2 targets in inductively coupled plasmas, were identified by means of mass spectrometry (MS) and optical emission spectroscopy. The surface of etched Ge39Se61 thin films were analyzed thanks to in situ x-ray photoelectron spectroscopy (XPS) and compared with those of Ge and Se etched samples. In 100% SF6, the successive adsorption of fluorine atoms forms SeF
x
(x = 2, 4, 6) and GeF
x
(x = 2, 4) stable and volatile products, generating a surface with few residues as interpreted with in situ XPS. The identification of SSe

F

x

+

(x = 2, 3, 7) ions confirms that sulfur atoms play a role during the etching of Se-containing materials. A 0D kinetic model predicted the evolution of reactive neutral fluxes, ion fluxes and plasma parameters (T
e and n
e) in SF6/Ar plasmas. It was found that the SeF6 and GeF4 concentrations, through Se

F

5

+

and Ge

F

3

+

MS signals, were related to the fluorine atom flux. In SF6/O2, the simultaneous effect of fluorine and oxygen adsorption induces (Se)
x
–Ge–R
4−x
environments (R = F, O) at the surface of the Ge39Se61 thin films.
Interface reactions between water and ionic wind generated by d.c. corona discharge in nitrogen
Authors: Zhang Zhongshu , Wilson Mark P , MacGregor Scott J , Timoshkin Igor V , Given Martin , Wang Tao
Published: August 2020

This work investigated the interface reactions between water and ionic wind from a positive d.c. corona discharge in nitrogen. The effects of drift ions and active neutral species were investigated on their production of hydrogen peroxide in water. Both positive drift ions and active neutral species were found to produce hydrogen peroxide in water. 1 mol positive drift ions can produce 0.13 mol hydrogen peroxide under atmospheric pressure; a reduced gas pressure increased the production of hydrogen peroxide, with 1 mol ions producing 0.29 mol hydrogen peroxide at 100 torr. The gas pressure has little effect on the production of hydrogen peroxide by active neutral species. The drift positive ions acted as ion anode on water surface, reacting with water to produce hydrogen, oxygen, and hydrogen peroxide. The adsorbed form of OH and O produced at the interface can synergistically work to react with the OH scavengers in water. Both HO2 and H2O2 from the discharge were transported to water to produce the liquid phase hydrogen peroxide.
A lumped parameter model for strip-shaped dielectric elastomer membrane transducers with arbitrary aspect ratio
Authors: Rizzello G , Loew P , Agostini L , Fontana M , Seelecke S
Published: August 2020

Dielectric elastomer (DE) membrane transducers allow to achieve large strain, low energy consumption, low-noise, and highly compact mechatronic devices. To optimize the design of membrane DEs via numerically efficient software tools, as well as to develop accurate control and self-sensing algorithms, a lumped parameter model is required. In the case of rectangular DE strips clamped at both ends and subject to a uniaxial in-plane load, the resulting necking and inhomogeneous deformation turn out to be challenging to be described via standard lumped models, thus making it necessary to rely on numerically involved finite element (FE) tools. In this paper, we present a novel modeling framework that permits to accurately describe clamped DE membranes with generic aspect ratio in a control-oriented fashion. The model is grounded on an anisotropic free-energy function, which maps the inhomogeneities due to clamping within the constitutive membrane behavior. In this way, a lumped description of the DE can be obtained in terms of average stress and stretch quantities. After presenting the model, an extensive validation is performed by means of comparative studies with FE simulations as well as experimental results. It is observed how the proposed model permits to accurately describe the electro-mechanical response of clamped DE membranes for a wide range of aspect ratios, including nearly-uniaxial, nearly-pure shear, as well as intermediate configurations.
Integrating transcriptomics and bulk time course data into a mathematical framework to describe and predict therapeutic resistance in cancer
Authors: Johnson Kaitlyn E , Howard Grant R , Morgan Daylin , Brenner Eric A , Gardner Andrea L , Durrett Russell E , Mo William , Al’Khafaji Aziz , Sontag Eduardo D , Jarrett Angela M , Yankeelov Thomas E , Brock Amy
Published: August 2020

A significant challenge in the field of biomedicine is the development of methods to integrate the multitude of dispersed data sets into comprehensive frameworks to be used to generate optimal clinical decisions. Recent technological advances in single cell analysis allow for high-dimensional molecular characterization of cells and populations, but to date, few mathematical models have attempted to integrate measurements from the single cell scale with other types of longitudinal data. Here, we present a framework that actionizes static outputs from a machine learning model and leverages these as measurements of state variables in a dynamic model of treatment response. We apply this framework to breast cancer cells to integrate single cell transcriptomic data with longitudinal bulk cell population (bulk time course) data. We demonstrate that the explicit inclusion of the phenotypic composition estimate, derived from single cell RNA-sequencing data (scRNA-seq), improves accuracy in the prediction of new treatments with a concordance correlation coefficient (CCC) of 0.92 compared to a prediction accuracy of CCC = 0.64 when fitting on longitudinal bulk cell population data alone. To our knowledge, this is the first work that explicitly integrates single cell clonally-resolved transcriptome datasets with bulk time-course data to jointly calibrate a mathematical model of drug resistance dynamics. We anticipate this approach to be a first step that demonstrates the feasibility of incorporating multiple data types into mathematical models to develop optimized treatment regimens from data.
Unified interpretation of scalegenesis in conformally extended standard models: a dynamical origin of Higgs portal *
Authors: Ishida Hiroyuki , Matsuzaki Shinya , Ouyang Ruiwen
Published: August 2020

We present a universal interpretation of a class of conformal extended standard models that include Higgs portal interactions as realized in low-energy effective theories. The scale generation mechanism in this class (scalegenesis) arises along the (nearly) conformal/flat direction for breaking scale symmetry, where the electroweak symmetry-breaking structure arises similarly as in the standard model. A dynamical origin for the Higgs portal coupling can provide the discriminator for the low-energy “universality class,” to be probed in forthcoming collider experiments.
An insight into the present capabilities of national metrology institutes for measuring sparkle
Authors: Ferrero A , Basic N , Campos J , Pastuschek M , Perales E , Porrovecchio G , Šmid M , Schirmacher A , Velázquez J L , Martínez-Verdú F M
Published: August 2020

Large-effect pigments, due to their strongly specular reflectance, produce a special visual texture known as sparkle. The use of these pigments in many industries (automotive, cosmetic, paper, architecture...) makes the control of this visual texture necessary. Sparkle measurands have been defined in this article, so that traceability of sparkle measurements can be provided by national metrology institutes or designated institutes. Some of them (Physikalisch-Technische Bundesanstalt, Eidgenössisches Institut für Metrologie, Cesky Metrologicky Institut and Consejo Superior de Investigaciones Científicas) have tested their existing measurement capabilities for the defined sparkle measurands, and their results are presented and thoroughly compared. Two possible sources of systematic error have been identified: inadequate illumination and collection solid angles, and an inadequate size of the virtual aperture used to assess the luminous flux reflected by the effect pigments. Finally, it has been shown that the measures correlate excellently with the sparkle visual data. The results shown in this research support the sparkle measurands defined here as adequate quantities for defining the standard measurement scale of sparkle claimed by industry.
Design of a New Type of automatic welding for saddle-type intersecting line
Authors: Yong Wang , Lei Wang , An-gen Bian
Published: August 2020

A new type of pipe-to-pipe intersecting line welding device uses a large and small cam structure and a circular arc-shaped sliding track of the welding gun frame, which ensures that the welding gun rotates with the workpiece to coordinate the lifting movement and the corresponding adjustment of the welding gun’s position. Production practice shows that the movement’s position is precise, there is no accumulation of transmission errors, and the welding gun’s movement has high reproducibility and precision. It has a low-cost automated special welding equipment for pipe-to-pipe intersections.
The Application of A New Disturbance Observer in Variable-load Electro-Optical Stabilized Platforms
Authors: Li Zhi-qiang , Song Chao , Xu Feng-lei , Huang Jie , Luan Xiao-fei
Published: August 2020

Aiming at controlling difficulty of variable load Electro-Optical Stabilized Platforms (EOSPs), a control algorithm of perturbation rejecter + Disturbance Observer (DOB) is proposed by using the disturbance suppressor to compensate the disturbance observer due to model mismatch, to improve the robust performance of whole control system and the performance of disturbance suppression. The above control methods are validated in dual-rate loop structure under different friction load and effectively improve the stabilize accuracy of EOSPs. The results show that the compensation strategies of coordinating with one another can constrain effectively the impact of control performance caused by load change, and improve the platforms’ stabilization accuracy. According to experimental verification, the control method is effective and applicable in variable load conditions, and can provide reference resources and basis for engineering application of the control algorithm.
Super-twisting sliding mode control of permanent magnet synchronous motor based on voltage compensation
Authors: Jinli Xu , Zhen Peng
Published: August 2020

In this paper, a compensation method for the expected voltage value was proposed to the problem of speed overshoot in traditional Super-twisting sliding mode control applied to permanent magnet synchronous motors (PMSM). This method combines the voltage change caused by the load angle change, overcomes the overshoot situation when the speed changes rapidly, and speeds up the time to reach the given speed. The proposed control theory is verified by MATLAB/Simulink software. Simulation results show that the proposed compensation method can successfully suppress speed overshoot and improve the dynamic response of speed.
Research on Error and Compensation of Volume Measurement System for Nondestructive Testing
Authors: Yong Gan , Jianghao Yu , Yongsen Wen
Published: August 2020

In order to improve the measurement accuracy of the three-dimensional non-destructive testing device for slice volume, the experimental error caused by the hydraulic loss of the experimental container is analyzed and compensated. Through the analysis of the overflow characteristics, the weir flow model of the overflow is established, the profile curve of the overflow and the overflow round tube are optimized to reduce local losses, and verified by experiment. The results show that the measurement accuracy of the liquid volume is improved by about 54.85%, and this optimization scheme is effective. By optimizing the experimental device, the error is compensated to ensure the accuracy of data collection.
Simulation on guided waves in the pipe with defects
Authors: Peng Ding , Guangfei MA , Lei Guan , Chao Lu , Ling XU
Published: August 2020

In this paper, the finite element numerical simulation is used. The transmission and reflection of both L (0,1) mode and F(1,1) mode of the ultrasonic guided wave were simulated. The transmission and reflection of the ultrasonic guided wave in the pipe were analyzed when the defect in different axial, circumferential, and depth. When the defect’s size changes in the axial direction and circumferential direction, the trend of the two kinds modes’ reflection coefficient is the same. In a certain size, the reflection coefficient of F(1,1) is higher than the L(0,1). When the depth of the effect change, the trend of the two modes’ reflection coefficient is different.
Instantaneous optimal control for vehicle nonlinear suspension system with time delay
Authors: Yan G , Fang M X
Published: August 2020

This paper deals with the problem of instantaneous optimal control for vehicle suspension system with control time delay. The control objective is to improve vehicle ride comfort. Firstly, the dynamic equation of nonlinear suspension system is established. Secondly, to reduce the effect of control time delay, a formula based on integral transformation is introduced to obtain instantaneous optimal control strategy. Finally, the effectiveness of instantaneous optimal control is verified by numerical simulation. The analysis results reflect that the instantaneous optimal control could ensure the stability of the control system no matter how the time delay changes. And it is also found that the control effect varies with the control time delay. It lays a foundation for the study of how to add intentional time delay in the control loop to make the control effect better. This paper provides an effective way for nonlinear vibration control, which has important theoretical and engineering application value.
Influential node identification method of assembly system based on TOPSIS and Topology
Authors: Yuan Bo , Chang Jian-e , Zhang Feng
Published: August 2020

In order to find the influential manufacturing resources in a complex assembly system, a topology model of a complex assembly system was constructed based on the complex network theory. Complex network evaluation indicators with different attributes were used to evaluate the network, and AHP subjective weight method was used to determine the subjective weights between different evaluation indicators. Then the CRITIC weighting method was used to give the objective weights of each evaluation index, and perform subjective evaluation. The combination was modified to obtain the final combination weight, and the importance of key manufacturing resources was ranked by the TOPSIS comprehensive decision method. Based on the simulation calculation of the automobile assembly line network, the analysis and comparison of the ranking results were performed. The analysis results show that the comprehensive evaluation and comparison method has the comparative advantage of identifying key resources.
System Design and Characteristic Analysis of Intelligent Follow-up Hydraulic Muffler
Authors: Chang-ji Shan , Jun Yuan , Hang Jiang , Yan Cai , Yin Zhao , De-Lan Wu
Published: August 2020

The pulsating flow output of plunger pump will produce pressure pulsation after flowing through the pipeline. Using hydraulic muffler to attenuate the pressure pulsation of the pipeline is an economical, reliable and easy to implement method. Intelligent follow-up hydraulic muffler, which adapts to pressure pulsation changing at any time by changing its own parameters, has become a research hotspot. Intelligent follow-up hydraulic muffler can accurately and effectively attenuate the pressure pulsation of the system and maximize the attenuation performance of the hydraulic muffler. The structure and performance of the existing intelligent follow-up hydraulic muffler are mainly introduced. The general methods, principles, advantages and disadvantages of intelligent follow-up hydraulic muffler design are summarized. On this basis, the development trend of intelligent hydraulic muffler is predicted and prospected.
Design of Self-service Car Washing Machine Control System Based on ARM
Authors: Peng Sun
Published: August 2020

With the cars in our country’s rapid increase, the limited quantity of traditional car washing shop has been unable to satisfy people’s needs. Responding to this problem the author designed a set of self-service car washing machine control system based on ARM, and a set of remote monitoring system based on 4G mobile network. The terminal control system adopted high speed, low power microcontroller LPC4350 as the control core; adopted RFID read-write module to realize IC card consumption; adopted EM770W 4G module for the washing machine terminal could connect to 4G mobile network. Through MODBUS protocol, the remote monitoring system based on KINGVIEW6.55 could communicate with the terminal system, and realized the real-time monitoring and recording the washing machines’ working parameters regularly. Because the designed system realized the unattended self-service washing, so it greatly reduced the maintenance workload, and improved the work efficiency.
Lung Parenchyma Segmentation Based on Improved Unet Network
Authors: Lv Lei , Sun Xin
Published: August 2020

Segmentation of lung parenchyma is an essential link in the diagnosis of lung diseases and also the premise of disease analysis. The accuracy of lung parenchyma segmentation affects the diagnosis and treatment of lung diseases. The size of input data will be reduced by using the traditional Unet network. In this paper, an improved Unet network structure is proposed to segment lung parenchyma automatically. In the process of convolution, the size of input data is kept constant by padding same and dropout layer is introduced into the network. We use cross entropy loss function to train the model for the first time. After the model converges, we use custom Dice loss function to fine tune to improve the accuracy. By calculating Jaccard coefficient and DSC coefficient, our lung parenchyma segmentation method has a very high accuracy, which is better than the earlier researchers’ segmentation algorithm. The significance of this study is to provide pretreatment for the diagnosis and treatment of lung diseases.
Applied Research of Hierarchical Multi-objective Optimization Method in High Speed and High Precision Placement Machine
Authors: Huang Yinhua , Zhao Lianxing , Liu Peng
Published: August 2020

In practical engineering, placement optimization of multi-head in the high speed and high precision Surface Mount Technology (SMT) is a multi-objective optimization problem. It mainly includes the feeder distribution optimization, the component placement sequence optimization and the nozzle configuration optimization. Optimization problems are complicated and mutual coupling between them. In this paper, the hierarchical multi-objective optimization model is developed. In the hierarchical structure, the nozzle optimization is constructed as a 0-1 integer programming optimization model for the first master hierarchy. In the second hierarchical, component mounting sequence, feeder optimization and picking order are parallel optimized based on the first hierarchy optimization. The respective problems related algorithm strategies have been proposed. The engineering experiments show that this hierarchical multi-objective optimization method can significantly improve the overall performance of the multi-head placement machine with high speed and high precision.
Development of the safety diagnosis system for VCU of pure electric vehicle
Authors: Yongqiang Zhao , kaicheng Zhao , Chang Li , Xiang Li
Published: August 2020

Perfect safety monitoring system is the guarantee of vehicle safety. In this paper, through functional safety analysis and FMEA analysis, a pure electric vehicle safety monitoring system is developed, which can diagnose possible faults in real time, monitor software operation problems, and take appropriate fault handling strategies and safety mechanisms to ensure the safe and reliable operation of vehicles.
Design of a Ceramic Brick Cutting Robot
Authors: Peng Sun
Published: August 2020

Ceramic tiles are now widely used in indoor and outdoor decoration projects. Aiming at the shortcomings of the existing ceramic tile cutting machine, a ceramic tile cutting robot is designed. PLC is used as the control core of the robot to make the size adjustment of ceramic tile cutting convenient and flexible, the cutting error is small, the tile section is smooth and tidy, and the breakage rate is low, which improves the efficiency of ceramic tile cutting and reduces the labour intensity of workers.
Quality control mode of intelligent assembly workshop based on digital twin
Authors: Hao B , Wang M Y , Fu S L , Xu D P , Wang J X
Published: August 2020

Intelligent assembly workshop technology based on digital twin is a potential way to realize intelligent manufacturing. Aiming at the complex assembly process and low assembly quality in the complex product assembly workshop, the research on the quality control mode of intelligent assembly workshop based on digital twin was carried out. On the basis of real-time collect of resource location information, assembly process information and assembly quality information by using the quality control mode, the Markov method and Manhattan distance algorithm were used to realize assembly process and quality control in assembly workshop. Finally, taking an aircraft wing assembly workshop as an example, the prototype control system of intelligent assembly workshop is applied and verified to provide a technical approach for improving assembly quality and realizing assembly workshop real-time and dynamic control.
A Survey of Water Droplet Recognition Algorithms on Object Surface
Authors: Yingya Zheng , Xiangzhen Zan
Published: August 2020

The recognition and extraction of water droplets on object surface have important practical application value. This article focuses on summarizing the different water droplet recognition segmentation algorithms, mainly based on threshold, edge detection, region and morphology segmentation, and clustering and special model-based segmentation algorithms. Then, some shortcomings of the current algorithms are analyzed and the future research direction is prospected.
Progress of Application of Microfluidic Chip
Authors: Sun C M
Published: August 2020

Due to microfluidic chip’ s small sample consumption, high detection sensitivity, easy integration, automatic detection and other characteristics, it has been widely used in many fields such as environmental science, chemical detection, and life sciences. This article summarizes the current application and commercial development of microfluidic chips. At the same time, some deficiencies in the technology, problems to be solved and future development directions are also reviewed and prospected.
Research on intelligent water platform based on Cloud Computing
Authors: Xiye Feng , Xiaoyan Yin , Hailin Zhu , Cuicui Ji , Chunming Xu , Tan Chen
Published: August 2020

Intelligent water platform is based on cloud computing and big data to build a comprehensive water management system. The system can analyze and process massive water information in a timely manner through cloud management, and make corresponding processing results to assist decision-making suggestions, so as to manage the whole production, management and service process of water system in a precise and dynamic way, so as to reach the intelligent state.
Study on application of high speed cross belt auger drilling machine in fragmentized coal seam
Authors: Pengbo Xu , Ke Yao , Rui Zhang , Peng Fang
Published: August 2020

In order to extract gas efficiently in soft outburst coal seam with belt haulage roadway, a ZDY2800LG full hydraulic drilling rig with high drilling rate, cross-belt construction ability and strong adaptability of technology was developed. The whole process of industrial test of drilling machine is introduced in detail through three stages of formation groping, breakthrough seeking and efficient drilling.
Study on the cavitation range of the side of the ultrasound radiation rod in aluminum melt
Authors: Su Sichao , Li Ruiqing , Li Xiaoqian
Published: August 2020

The effect of cavitation and sound flow produced by ultrasound in high temperature melt is utilized to achieve grain refinement. Previous papers mainly discussed the cavitation mechanism of the end face of the ultrasonic radiation rod, but did not pay enough attention to the cavitation effect on the side face of the radiation rod. Therefore, this paper studied the cavitation range of the side of the ultrasonic radiation rod. Firstly, the amplitude of the side of the ultrasonic radiation rod was measured. It was found that the amplitude of the side varied greatly with the location. Secondly, the simulation results showed that the vibration of the side of the radiation rod changed alternately with periodic peaks and troughs. Thirdly, the ultrasonic experiment of pure aluminum was carried out in crucible. Two titanium plates were cut into a suitable shape and placed in crucible. After 13.5 hours of ultrasonic treatment, it was found that the surface of titanium plates was not uniformly eroded, but the most serious cavitation erosion occurred in the middle position. Therefore, it can be explained that the cavitation effect occurred in this region. At the same time, the macrostructure of aluminium ingot treated by ultrasound was obviously refined.
Structure Design and Analysis of Portable Hoisting Equipment
Authors: Guobao Ding
Published: August 2020

Armor equipment replacement repair has been facing the problem is that the heavy parts in the car disassembly and assembly consume a lot of manpower. How to disassemble and assemble components efficiently and safely is not a perfect research field at home and abroad. The design of portable lifting equipment is very necessary in the disassembly process. In this paper, portable hoisting equipment is taken as the research object. Through the research on its hoisting mechanism, based on the introduction of mechanical structure and working principle, 3d modeling software Pro/E is used to model and virtually assemble portable hoisting equipment. In the later stage, the finite element analysis software can be used to check its stiffness and strength and optimize its design.
Application of full-section gas extraction drill in zhao zhuang coal mine
Authors: Yong Gao , Pengbo Xu
Published: August 2020

In order to solve the coal mine gas extraction from whole section fan-shaped hole fast construction technical problems, through to walk type crawler drilling rig structure and the design of the hydraulic system, developed a whole section of roadway fan in mine gas extraction hole drill, the Angle of institution by hydraulic motor driven rotary gear reducer to feed within a cross section of 360 ° fuselage quickly adjustable Angle, reduce the assistant time of drilling construction, the hydraulic system controlled by single action, the operation is simple and reliable. Field tests show that the drill has strong structural stability, easy to move, and is a monolithic crawler drill that can be applied to the construction of gas extraction borehole with large inclination Angle and full section.
Analysis and Optimization of Flow Field in Electrochemical Machining of the staggered groove on Gear Tooth Surface
Authors: Chen Yuanlong , Huang Zihao , Lin Hua , Chen Qi
Published: August 2020

Self-lubricating gears can better adapt to the bad lubrication conditions without oil or oil scarcity. Staggered groove can be produced by Electrochemical machining (ECM) on the gear tooth surface to fill solid lubricating materials. The cathode with and without flow slot has been designed. Three basin models have been established which are forward flow mode, reverse flow mode and side flow mode. The gap flow field of ECM has been analyzed. It is determined that positive flow is a suitable flow mode. By optimizing the structure of the flow slot in the cathode, the deficiency of the forward flow field is improved.
Research on Aerodynamic Characteristics of Forward-swept Wing with Inclined Basic Airfoil
Authors: Xinbing SU , Wen Jiang , Xiwei Zhao , Junyi Zhang
Published: August 2020

Variable forward-swept wing (VFSW) aircraft is a kind of typical morphing aircraft. With the change of forward-swept angle, the airfoil of Variable forward-swept wing which is based on incoming flow will also be changed, and this change has a very important influence on flight performance. In order to explore this impact, this paper firstly build nine airfoil models under different forward-swept angle, through the calculation by fluent, the impact on airfoil aerodynamic characteristics from angle of attack, mach number and forward-swept angle is analyzed. The results show that, while flying at the sea level in a low angle of attack, the lift coefficient, resistance coefficient and moment coefficient will increase with the rise of forward-swept angle, but while flying in a high angle of attack, these coefficients will decrease with the rise of forward–swept angle. The results also can provide references for further research of aerodynamic configuration of variable forward-swept wing aircraft.
Research on Equipment Life Cycle Cost Prediction Based on GA-LSSVM
Authors: Chen Yong-hong , Su Yong-sheng , Du Xiang-hua
Published: August 2020

Penalty parameter γ and kernel parameter σ
2 are two important parameters of LSSVM. In this paper, the GA-LSSVM prediction model is constructed, which the genetic algorithm was used to optimize the parameters. Comparing with LSSVM model, the GA-LSSVM model improves the disadvantage that the parameters can only obtained by experience. Also in order to check model prediction accuracy, the posterior difference method(PDM) was used. The calculation results show that the GA-LSSVM model has higher prediction accuracy than other models, and it is a feasible and reliable method for equipment life cycle cost prediction, also the model can be extended to other prediction fields.
Summary of ten innovations in the machinery field---the analysis on material processing contrary the mechanical principles etc.
Authors: Li C M , Yin X L , Zhang Y , Sun F , Cao H , Liu Q , Liu X
Published: August 2020

Ten innovations in the mechanics field are summarized. For the pre-published innovations, only the results are introduced. 1) The analysis of the diamond cutting tools characteristics based on the principle of the metal outflicting the wood. We create the word “outflict”. Its affix means surpassing, suppressing, holding high, having ability to defeat, conquer and constraint. Its morpheme means conflicting and striking. 2) The concept of mechanical principle. For instance, the structure body is classified into rod, block and plate. 3) The mechanism combination analysis method instead of body group and multibody mechanism. 4) A unified moment balance equation of rigid body. 5) The harmonic composition and decomposition method for the body position angle of crank rocker mechanism. 6) Definition of kinematics bifurcation position, including dead point. 7) Indefinite application in mechanical dynamics. 8) The assembly graphic method for vector equation with too many unknown quantities. 9) The derivation process of the velocity ratio formula of the coupling. 10) Velocity zero correction method considering the characteristics of static friction.
Multi-parameter joint optimization of self-piercing riveting on aluminum alloy plate
Authors: Zhang Y H , Shi B J , Zhong J B
Published: August 2020

Self-piercing riveting technology can achieve more efficient connection of aluminum alloy plate parts. In this study, the 5052 plate and the 6061 plate are taken as the research objects. By establishing a finite element model and using a multi-objective optimization method, multiple parameters are jointly analyzed. The sensitivity parameter analysis was used to determine the value range of the research parameters, and the response surface analysis method was used to construct the functional relationship between the parameter variables and the system response. Finally, a multi-objective optimization model was established to obtain a reliable combination of rivet parameters and die parameters.
Study on Topology Optimization Design of Screw Extrusion Filter
Authors: Chen Yuanlong , Cheng Qianqian , Chen Rongna
Published: August 2020

In order to meet the needs of sludge dewatering treatment in urban areas, a screw extrusion filter with dynamic and static ring was designed. The spiral axis of the filter is simulated by finite element statics. Based on the simulation results, the structure of the spiral axis was topologically optimized, and the optimized mathematical model was established. The minimum mass was taken as the objective function, and the reasonable structure size of the spiral axis was obtained after optimization. Under the condition of satisfying the structural strength, its quality was reduced by 9.7%, and a good optimization effect was achieved.
Profile imitation algorithm research for the cam contour
Authors: Qinglu Xu
Published: August 2020

In this paper, the characteristics and simulation accuracy of different simulation algorithms are studied for the cam profile. The triangular square approximation is improved, and a high-precision simulation algorithm is proposed. The improved simulation algorithm has achieved good results in practical applications. Comparative analysis using examples: comparing the accuracy of the three approximation methods of spline interpolation, unconstrained best square approximation, and best square approximation with first-order boundary. It is concluded that the optimal triangular square approximation of the first-order boundary can more accurately reflect the law of periodic motion, and is suitable for the state approximation and characteristics of periodic motion.
Study on vibration characteristics of plastic helical gear assembly with prestress
Authors: Baogui Wu , Zaiyou Du , Ruchen Huang
Published: August 2020

In order to obtain the vibration characteristics of helical gear transmission system in actual working conditions, two kinds of CAE software are combined to analyse the helical gear vibration with prestress. CAD software interface is used to import the model into ANSYS, and then multi-point coupling constraint is proposed to obtain the first six natural frequencies and main modes of the plastic and steel gears with speed and load. The results suggest that the design of plastic gears meets the requirement of bending strength, and prestress causes the natural frequency of the plastic gears to increase faster than that of the steel gears. The dynamics simulation of ADAMS multi-body system shows that the meshing frequency of plastic gear is obviously lower than the natural frequency, so the system will not resonate. Research shows that plastic helical gears can replace steel gears for low-speed gear pumps, which provides a research method for miniaturization, lightweight and precision designing of low-speed gear pumps.
Deduction of gear system proportion in any leaf rose line drawing
Authors: Ma Li’an , Yue Jixiang , Wang Guodong
Published: August 2020

Based on the planetary gear mechanism which realizes the three-leaf rose line drawing method, the ratio of the number of teeth of the sun gear, the planetary gear, the internal gear, and the length of the tracing rod are deduced. The calculation formulas of the number of teeth and the length of the tracing rod for drawing rose lines of any leaf are obtained. SolidWorks is used for modeling and dynamic simulation. The simulation results show that the conclusion is correct.
Gas column resonance analysis of reciprocating compressor
Authors: Zhenyu Zhang
Published: August 2020

The oscillation process based on acoustic vibration system and electrical circuit can be described by the same type of differential equation. MATLAB/SIMULINK was used to establish the electrical model of the outlet piping system of the 2D-90Mg-2.5/1.5 type air combined compressor in the laborator. The natural frequency of the gas column is obtained and compared with the results of finite element analysis. It is proved that the electrical simulation method is feasible and simple to calculate the natural frequency of gas column in compressor pipeline system.
The influence of temperature on the impedance characteristics of PEMFC
Authors: Liu Qian
Published: August 2020

Electrochemical impedance spectroscopy (EIS) is one of the main characterization methods of PEMFC, which has important reference value for evaluating the performance of PEMFC. In this paper, the impedance curves of PEMFC at different temperatures are measured by experiments, and the equivalent circuit is used to analyze the influence of battery temperature and humidification temperature on the impedance. The study found that when the battery temperature is higher than the humidification temperature, both the ohmic impedance and the Faraday impedance increase significantly; the double layer in the PEMFC mainly embodies the capacitive reactance characteristics, and the more the humidification temperature is higher than the cell temperature, the more obvious the degree of the double layer embodies the capacitive reactance characteristics. The results of this study have a certain reference value for understanding the working principle of PEMFC and improving its performance.
Research on Constitutive Relation of TC11 Titanium Alloy Based on PSO-LSSVM
Authors: Zhu N Y , Chen Q M , Luo X X , Cai G P
Published: August 2020

In order to accurately predict the flow behavior of the TC11 titanium, the uniaxial compressive tests of TC11 titanium alloy were carried out by Gleeble-1500 thermal simulator with the temperature in the range of 900∼1050°C, and the strain rate of 0.1∼10s−1. Then the particle swarm optimization (PSO) was used to optimize the parameters of the least square support vector machine (LSSVM) model, and a high-temperature constitutive model of TC11 titanium alloy based on PSO-LSSVM was established, and the average relative error between the predicted value and the experimental value of the established constitutive model based on PSO-LSSVM is 1.51%, and the correlation coefficient is 0.997. The established constitutive model can accurately predict the high temperature flow behavior of TC11 titanium alloy. This indicated that a new method for establishing the constitutive model is provided.
Synthesis and adsorption properties of cross-linked carboxymethyl starch (CMS)
Authors: Li H H , Gao Y H , Zhang L H , Li N , Liu Z F
Published: August 2020

Cross-linked carboxymethyl starch CMS was synthesized with cross-linked starch as raw material, sodium chloroacetate as etherification agent and sodium hydroxide as catalyst, and the structure of the product was characterized by FTIR, SEM and XRD. The optimum synthesis conditions of CMS were m (CSt): m (MCA) = 5:3, NaOH dosage 12 ml, reaction temperature 55 °C and reaction time 3 h. When the concentration of copper ion in the simulated water sample was 25 mg/L and the dosage of CMS was 2 g/L, the removal rate of copper ion was 96.0%, and the adsorption capacity of CMS was 15.4 mg/g.
Evaluation of Measurement Uncertainty of Oxygen in Titanium Alloys based on Monte Carlo Method
Authors: Liu P , Zhang Y , Zhang X Y , Zhang J H
Published: August 2020

Uncertainty is a scientific representation of the quality level and dispersion of measured results. Considering the key issues of the application of Monte Carlo method (MCM) to evaluate the uncertainty of the single-point calibration linear measurement system, such as the MCM evaluation model and the introduction of the uncertainty from the apparatus calibration and repeated measurements, two correction factors were introduced to characterize the random effects of conditional variations and system fluctuations on the measurement repeatability of the certified reference material (CRM) for calibration and the tested sample, and a mathematical model for evaluating the uncertainty of single-point linear calibration measurement system based on MCM was proposed. Then the specific evaluation process and application of MCM was systematically explained based on a case study for determination of oxygen content in Ti-6Al-4V titanium alloy by inert gas fusion - infrared absorption method. Under the measurement condition that the CRM repeated 4 times and the Ti-6Al-4V sample repeated twice, the simulation result was wMCM= 0.178 % ± 0.009 % (k= 2), which was consistent with the result of wGUM= 0.178 % ± 0.009 % (k= 2), based on the traditional GUM method recommended by ISO/IEC Guide 98-3: 2008. The new method solved the application of MCM to evaluate the uncertainty of the single-point calibration linear measurement system. And it can be directly applied to the uncertainty evaluation of a single-point calibration linear measurement system. Further, it is expected that MCM will be developed and applied in other linear measurement system, which will promote the study and application of measurement uncertainty to open up new horizons.
Study on Thermal Conductivity of Carbon Fiber / Resin Composite Modified with Graphene Nanoplatelets
Authors: Liu Fangbiao , Wang Danyong , Li Shuhu , Wei Huazhen , Chen Yiwei , Liu Juncong
Published: August 2020

A method for calculating thermal conductivity of graphene/carbon fiber reinforced resin composites (GnP-CFRP) was established basing on the Mori-Tanaka program in the DIGIMAT software. The influence of grapheme nanoplatelets (GnP) on the thermal conductivity of composites has been simulated and experimentally verified. The results show that the thermal conductivity of GnP-CFRP increased with the increase of GnP content, and when the GnP content is too high, the increasing rate of thermal conductivity decreases gradually. In addition, the maximum prediction error of the simulation calculation method in this paper is within 7.27%, which is in good agreement with the actual situation.