bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quadrotor’s modeling and control system design based on PID control
Authors: Zhao Jiahao 
Published: May 2023

Abstract
The quadrotor is an unmanned aerial vehicle with a compact construction and good maneuverability. In recent years, this type of aircraft has been widely developed and has a wide range of military and civil applications. Due to the dynamic characteristics of strongly coupled, non-linear, and multi-variable quadrotor UAVs, modeling the dynamics of UAVs and designing control systems has been the focus of quadrotor research. This paper takes the quadrotor UAV as the research object. Firstly, for the basic structure of the quadrotor UAV, the aircraft-body coordinate system and the earth-surface coordinate system of the UAV flight are established, and the transformation matrix of the two coordinate systems is given. Based on a series of reasonable assumptions, the non-linear system is modeled and a simulation platform is built using Simulink. Secondly, based on the constructed non-linear dynamics equations of the system, a cascade PID-based attitude controller and position controller of the UAV are designed. Finally, the designed control system was simulated in Matlab for straight-line flight and target-position flight, and obstacles were applied to the vehicle to verify the effectiveness of the control system. The final results show that the designed control system can make the quadrotor UAV stable in vertical and horizontal motion and can successfully travel to the target position. This paper provides a control method and framework for a PID controller-based quadrotor UAV control system.
Dynamic modeling and analysis for two-stage helical gear systems
Authors: Zhang Yi , Jin Bohan , Fan Fengchen , Gao Zhihui 
Published: May 2023

Abstract
With the increasingly stringent restrictions on vibration and noise generated by the gear system, it has drawn widespread attention to the ways of predicting and controlling. In order to obtain accurate dynamic characteristics and reflect real bearing collisions, a nonlinear bearing model were proposed in this study, according to which a 9-freedom model of the dynamic transmission system with the two-stage helical gears was established. The impact of bearing clearance on the gear system could be revealed by analysing the dynamic response. This article contributes to the study of vibration modelling and monitoring of a transmission system with two-stage helical gears.
Research on Intelligent Auxiliary Braking Technology Based on Active Safety of Mining Vehicles
Authors: Wei Yuhao , Liu Dening , Chen Lidong 
Published: May 2023

Abstract
Along with the continuous development of coal mining in electrification, and intelligent direction, the number of coal mine vehicles quantity has increased dramatically, and transportation safety accidents are high. The intelligent auxiliary braking system, as an effective collision avoidance or the main security technology to reduce collision damage, can be for target recognition, tracking, and measuring ahead through the millimeter wave radar and camera image sensor technology, and can warn drivers and related emergency braking measures in time through the command module for, thereby reducing the coal mine safety accident of the vehicle. The application of an intelligent auxiliary braking system to lower the speed of coal mine vehicles has a realistic significance.
Study on Control System of Bridge-Type Grab Ship Unloader
Authors: Zhang GaoGe , Xiang Yang 
Published: May 2023

Abstract
In order to improve the automation degree and unloading efficiency of the ship unloading control system of the large coal-fired power plant, the structure, operation principle and workflow of the bridge-type grab ship unloader in a coal-fired power along the river are analysed, and the control system of ship unloader software based on PLC is studied and designed. The designed control system of bridge grab ship unloader is convenient to operate under different working conditions and improves the automation degree and efficiency of coal unloading and also provides an application example for the development of ship unloader control research.
Research on the Measurement Method of Position Error of Series Robot Based on Laser Tracking Apparatus
Authors: Chen Yuyang , Xu Junlong , Ren Yu 
Published: May 2023

Abstract
With today’s industrial upgrading in the world, cutting-edge technologies such as induction measurement technology, bionic technology, virtual reality technology, etc., are gradually combined with the development and design of series robots. Governments of various countries have served the social and economic development, implemented not only innovation-driven but also vigorously promoted the development of the series robots industry. At this time, it is particularly important to provide metering, standards and verification support for cutting-edge technologies and disruptive technologies to meet the new needs of metering put forward by the industrial and technological revolution. In this paper, by trying to detect the accuracy and repeatability of position with a non-assembling detection method, the needs of robot position detection can be met. At the same time, it also further optimizes the detection link and reduces enterprise and detection costs. The end-setting of the detection method has strong versatility and can be applied to industrial robot systems with no loading or various actuators at the end.
Failure Analysis of Cracked Superheater in Quick Start Boiler
Authors: Chen Le 
Published: May 2023

Abstract
Given the failure and cracking of the elbow of the superheater tube of a quick-start boiler, macroscopic, chemical composition, metallographic, and microhardness tests were carried out on the failed samples, and the failure reasons were analyzed. The results show that the failure reason of the superheater tube is that the material state of the pipe elbow is not good, the stress condition of the elbow is complex, the stress is at a high level, and the inner wall produces intergranular cracking during operation, which leads to failure rupture.
Kinematic Analysis of a Centrally Driven Humanoid Robotic Arm
Authors: Zhu Zhichao , Bai Xiangjuan , Lin Zening , Xu Yuze , Chen Shanjun , Luo Zirong 
Published: May 2023

Abstract
The humanoid robotic arm has a broad prospect in the field of human-machine cooperation, but the large inertia of the current joint robotic arm slows down its response speed and running speed. In this study, a centrally driven humanoid robotic arm is introduced, which has the characteristics of small inertia, good rapidity, and high load. Screw Theory is used to establish the kinematic model and analyze that the robotic arm has no singular configuration in the working range. The geometric method and Monte Carlo method are used to analyze and verify its workspace, which is the basis for the subsequent dynamic analysis and control of the robotic arm.
An Applied Study on Eddy Current Array Testing Technology for Transportable Pressure Vessels
Authors: Mu Yanchun , Xie Xumeng , Jin Muda , Zhao Li 
Published: May 2023

Abstract
To solve the problems with the penetrant testing of transportable pressure vessels (“TPVs”), such as failure to detect near-surface defects, low testing efficiency, and damage of penetrating agents to testers’ health and the high-purity media in the TPVs, an experimental study on the eddy current array (“ECA”) testing technology is carried out, and the result is compared with the results of the dye penetrant testing and fluorescent penetrant testing. According to the experiment result, the ECA testing technology is characterized by moderate requirements for the status of the surface to be tested, fast testing, environmental-friendliness, electronic data storage, testing imaging, and accurate testing results. These advantages enable the ECA testing technology to be a green and environmental-friendly nondestructive testing technology that will promote future development and have exciting prospects in TPV testing.
Application of the reference interaction site model self-consistent field method based on the Dirac-Hartree–Fock wave function to a chemical reaction
Authors: Kanemaru K , Watanabe Y , Yoshida N , Nakano H 
Published: May 2023

Abstract
The reference interaction site model self-consistent field (RISM-SCF) method is a combined method of the electronic structure theory of molecules and the integral equation theory of molecular liquids. The RISM-SCF method based on the Dirac-Hartree-Fock wave function, recently proposed, is applied to a chemical reaction, specifically, a Menshutkin reaction in aqueous solution. The Helmholtz energy profile along the reaction coordinate is calculated and the characteristics of the reaction are discussed based on energy component analysis.
Production of dextran by Lactobacillus fermentum OR1 isolated from pickle mango juice
Authors: Karnthanachotikul N , Jaturapiree P 
Published: May 2023

Abstract
Dextran is an exopolysaccharide produces from bacteria that have been shown to be useful in the pharmaceutical and food industries. The goal of this study was to screen bacteria capable of producing dextran from Thai fermented foods and then maximize dextran production. The maximal amount of dextran produced by Lactobacillus fermentum OR1 isolated from pickled mango juice is 65 g/L after 20 h of incubation at 30°C and 200 rpm in DMB2 Medium containing 160 g/L sucrose. Dextran’s morphology, chemical structure, and thermal stability were further characterized using SEM and FTIR. The results suggest that Lactobacillus fermentum OR1 might be widely used in the production of linear dextran which has the potential to be used as a natural agent in food and other industries.
Biosynthesis of silver nanoparticles using extract of banana peel waste assisted by microwave irradiation
Authors: Phoemthaisong T , Ksapabutr B , Chaiyut N , Panapoy M 
Published: May 2023

Abstract
Silver (Ag) nanoparticles are among the most desirable nanomaterials for a variety of applications, such as lithium-ion battery, water pollution monitoring, photocatalytic water splitting, and medical devices. Their increased production and integration in environmental applications play an important role for nanoscience and nanotechnology in engineering. The synthesis methods of Ag nanoparticles include physical, chemical, and biological routes. In this study, we reported a rapid, eco-friendly, and cost-efficient method to synthesize Ag nanoparticles using an extract of banana peel waste as a reducing and capping agent under microwave radiation. A comparison between the conventional heating method and microwave radiation revealed that the microwave radiation method for the extraction of banana peel waste and the synthesis of Ag nanoparticles required much shorter extraction and reaction times. The effects of extraction conditions (banana peel content and extraction time) and synthesis conditions (silver nitrate concentration and reaction time) on Ag nanoparticles were investigated. The optimum conditions were found to be for the extraction: 50 g/L banana peel-to-water ratio and microwave extraction time of 140 s at 800 W and for the Ag nanoparticles synthesis: microwave reaction time of 120 s at 800 W and 1 mM silver nitrate solution and. Plasmonic Ag nanoparticles with a surface plasmon resonance peak at 420 nm and an average size of about 149 nm were synthesized.
Effect of Blowing Agents on Properties of Cellular rubber of Natural rubber / Chloroprene blends
Authors: Thongpin C , Angsupanich L 
Published: May 2023

Abstract
Cellular or sponge rubber can be by expansion of fluid state by gas produced from decomposition of foaming agents [1]. It can be manufactured from various types of rubber and chemicals depending on properties required [2]. Natural rubber can give excellent mechanical properties except for thermal ageing [3]. The objectives of this work were to improve thermal ageing of NR foam by incorporating chloroprene rubber, CR, into NR and foaming NR/CR blends. In order to study the effects of the type of chemical blowing agents on the properties of cellular NR/CR rubber blends, azodicarbonamide (ADC) and oxybisbenzenesulfonyl hydrazide (OBSH) were used as blowing agents and compared. The cure characteristic, mechanical, morphological, and flammability properties of the foams were investigated. The results indicated an increasing chloroprene rubber loading caused the increase in cure time, but decreased in cure rate index. In both cases of foaming agents, the cellular rubbers were found that tensile and tear strength were decreased with CR rubber loading, but the secant modulus and hardness were increased. Compression set was decreased with CR rubber loading. It is also showed that the flammability of NR/CR foam with high CR contents (more than 80%) was better than that with low CR contents. It is also found that using OBSH as foaming agent can produce cellular rubber containing better cell density and cell size distribution than ADC.
Artificial Neural Network Model for Predicting the Energy Loss of Natural Rubber Foam
Authors: Kaewpradit P , Uthaipan N , Dechwayukul C 
Published: May 2023

Abstract
In this work, a back-propagation artificial neural network model was optimally developed based on 25 experimental datasets for predicting the energy loss percentage of natural rubber foam. The foam specimens were prepared in a Banbury internal mixer at various conditions of mixing temperature (40-80°C), rotor speed (40-80 rpm), and mastication time (1-5 min). Stress-strain loops were analyzed by applying compressive force at aspeed test of 500 mm/min with the capacity of load cell 2.5 kN, the energy loss was further calculated. In model development, the experimental datasets were randomly divided into 70:15:15 for training, validation, and testing respectively. Levenberg-Marquardt algorithm was used as a training function was used because of its fast convergence. The prediction results revealed that the average prediction accuracy of the three models is higher than 90%. From a material design point of view, the developed model could be implemented to find the proper mixing conditions to obtain the material with the maximum energy dissipation.
The Study of Electrical Resistance of Silver Nanowires in Isopropanol for Heater Application
Authors: Jaisutti R , Indrarit N , Pattanarat K , Khamla T , Petchsang N 
Published: May 2023

Abstract
Silver nanowire is one of the most attractive materials for making devices. In this work, we are interested in using silver nanowires for heater application. To get a good heater, the electrical resistance of the device should be low in order to generate a high temperature. The media to disperse nanowires is also important and helps inter-connection between nanowires. Hence, we study the different amounts of isopropanol (IPA) in water as the media to disperse silver nanowires. The nanowire solutions were prepared under different percentages of isopropanol varying from 0% to 100%. Optical images showed the dispersity of nanowires after the media evaporated. The electrical resistances of spun silver nanowires on glass slides were conducted. The results show that the electrical resistance of nanowires in different amounts of IPA was separated into 2 groups. First, from 0% to 50% of IPA, the electrical resistances were lower than 15 Ohms. Second, for 75% to 100% of IPA, the electrical resistances show more than 85 Ohms. After heater testing of the first group, the temperature is stable and repeatable with a certain applied voltage and current.
Frailty transitions and prevalence in an ageing population: longitudinal analysis of primary care data from an open cohort of adults aged 50 and over in England, 2006–2017
Authors: Walsh Bronagh , Fogg Carole , Harris Scott , Roderick Paul , de Lusignan Simon , England Tracey , Clegg Andrew , Brailsford Sally , Fraser Simon D S 
Published: May 2023

Abstract

Introduction
frailty is common in older adults and is associated with increased health and social care use. Longitudinal information is needed on population-level incidence, prevalence and frailty progression to plan services to meet future population needs.

Methods
retrospective open cohort study using electronic health records of adults aged ≥50 from primary care in England, 2006–2017. Frailty was calculated annually using the electronic Frailty Index (eFI). Multistate models estimated transition rates between each frailty category, adjusting for sociodemographic characteristics. Prevalence overall for each eFI category (fit, mild, moderate and severe) was calculated.

Results
the cohort included 2,171,497 patients and 15,514,734 person-years. Frailty prevalence increased from 26.5 (2006) to 38.9% (2017). The average age of frailty onset was 69; however, 10.8% of people aged 50–64 were already frail in 2006. Estimated transitions from fit to any level of frailty were 48/1,000 person-years aged 50–64, 130/1,000 person-years aged 65–74, 214/1,000 person-years aged 75–84 and 380/1,000 person-years aged ≥ 85. Transitions were independently associated with older age, higher deprivation, female sex, Asian ethnicity and urban dwelling. Mean time spent in each frailty category decreased with age, with the longest period spent in severe frailty at all ages.

Conclusions
frailty is prevalent in adults aged ≥50 and time spent in successive frailty states is longer as frailty progresses, resulting in extended healthcare burden. Larger population numbers and fewer transitions in adults aged 50–64 present an opportunity for earlier identification and intervention. A large increase in frailty over 12 years highlights the urgency of informed service planning in ageing populations.
Deep brain stimulation alleviates tics in Tourette syndrome via striatal dopamine transmission
Authors: Rusheen Aaron E , Rojas-Cabrera Juan , Goyal Abhinav , Shin Hojin , Yuen Jason , Jang Dong-Pyo , Bennet Keven E , Blaha Charles D , Lee Kendall H , Oh Yoonbae 
Published: May 2023

Abstract
Tourette syndrome is a childhood-onset neuropsychiatric disorder characterized by intrusive motor and vocal tics that can lead to self-injury and deleterious mental health complications. While dysfunction in striatal dopamine neurotransmission has been proposed to underlie tic behaviour, evidence is scarce and inconclusive. Deep brain stimulation (DBS) of the thalamic centromedian parafascicular complex (CMPf), an approved surgical interventive treatment for medical refractory Tourette syndrome, may reduce tics by affecting striatal dopamine release. Here, we use electrophysiology, electrochemistry, optogenetics, pharmacological treatments and behavioural measurements to mechanistically examine how thalamic DBS modulates synaptic and tonic dopamine activity in the dorsomedial striatum.
Previous studies demonstrated focal disruption of GABAergic transmission in the dorsolateral striatum of rats led to repetitive motor tics recapitulating the major symptom of Tourette syndrome. We employed this model under light anaesthesia and found CMPf DBS evoked synaptic dopamine release and elevated tonic dopamine levels via striatal cholinergic interneurons while concomitantly reducing motor tic behaviour.
The improvement in tic behaviour was found to be mediated by D2 receptor activation as blocking this receptor prevented the therapeutic response. Our results demonstrate that release of striatal dopamine mediates the therapeutic effects of CMPf DBS and points to striatal dopamine dysfunction as a driver for motor tics in the pathoneurophysiology of Tourette syndrome.
The 2023 Duke-International Society for Cardiovascular Infectious Diseases Criteria for Infective Endocarditis: Updating the Modified Duke Criteria
Authors: Fowler Vance G , Durack David T , Selton-Suty Christine , Athan Eugene , Bayer Arnold S , Chamis Anna Lisa , Dahl Anders , DiBernardo Louis , Durante-Mangoni Emanuele , Duval Xavier , Fortes Claudio Querido , Fosbøl Emil , Hannan Margaret M , Hasse Barbara , Hoen Bruno , Karchmer Adolf W , Mestres Carlos A , Petti Cathy A , Pizzi María Nazarena , Preston Stephen D , Roque Albert , Vandenesch Francois , van der Meer Jan T M , van der Vaart Thomas W , Miro Jose M 
Published: May 2023

Abstract
The microbiology, epidemiology, diagnostics, and treatment of infective endocarditis (IE) have changed significantly since the Duke Criteria were published in 1994 and modified in 2000. The International Society for Cardiovascular Infectious Diseases (ISCVID) convened a multidisciplinary Working Group to update the diagnostic criteria for IE. The resulting 2023 Duke-ISCVID IE Criteria propose significant changes, including new microbiology diagnostics (enzyme immunoassay for Bartonella species, polymerase chain reaction, amplicon/metagenomic sequencing, in situ hybridization), imaging (positron emission computed tomography with 18F-fluorodeoxyglucose, cardiac computed tomography), and inclusion of intraoperative inspection as a new Major Clinical Criterion. The list of “typical” microorganisms causing IE was expanded and includes pathogens to be considered as typical only in the presence of intracardiac prostheses. The requirements for timing and separate venipunctures for blood cultures were removed. Last, additional predisposing conditions (transcatheter valve implants, endovascular cardiac implantable electronic devices, prior IE) were clarified. These diagnostic criteria should be updated periodically by making the Duke-ISCVID Criteria available online as a “Living Document.”
Population variability in thermal performance of pre-spawning adult Chinook salmon
Authors: Van Wert Jacey C , Hendriks Brian , Ekström Andreas , Patterson David A , Cooke Steven J , Hinch Scott G , Eliason Erika J 
Published: May 2023

AbstractClimate change is causing large declines in many Pacific salmon populations. In particular, warm rivers are associated with high levels of premature mortality in migrating adults. The Fraser River watershed in British Columbia, Canada, supports some of the largest Chinook salmon (Oncorhynchus tshawytscha) runs in the world. However, the Fraser River is warming at a rate that threatens these populations at critical freshwater life stages. A growing body of literature suggests salmonids are locally adapted to their thermal migratory experience, and thus, population-specific thermal performance information can aid in management decisions. We compared the thermal performance of pre-spawning adult Chinook salmon from two populations, a coastal fall-run from the Chilliwack River (125 km cooler migration) and an interior summer-run from the Shuswap River (565 km warmer migration). We acutely exposed fish to temperatures reflecting current (12°C, 18°C) and future projected temperatures (21°C, 24°C) in the Fraser River and assessed survival, aerobic capacity (resting and maximum metabolic rates, absolute aerobic scope (AAS), muscle and ventricle citrate synthase), anaerobic capacity (muscle and ventricle lactate dehydrogenase) and recovery capacity (post-exercise metabolism, blood physiology, tissue lactate). Chilliwack Chinook salmon performed worse at high temperatures, indicated by elevated mortality, reduced breadth in AAS, enhanced plasma lactate and potassium levels and elevated tissue lactate concentrations compared with Shuswap Chinook salmon. At water temperatures exceeding the upper pejus temperatures (Tpejus, defined here as 80% of maximum AAS) of Chilliwack (18.7°C) and Shuswap (20.2°C) Chinook salmon populations, physiological performance will decline and affect migration and survival to spawn. Our results reveal population differences in pre-spawning Chinook salmon performance across scales of biological organization at ecologically relevant temperatures. Given the rapid warming of rivers, we show that it is critical to consider the intra-specific variation in thermal physiology to assist in the conservation and management of Pacific salmon.