bluuebunny/crossref_metadata_2025_split huggingface dataset:
Relationship between Fracture of the Ulnar Styloid Process and DRUJ Instability: A Biomechanical Study
Authors: Nakamura Toshiyasu , Moy Owen J. , Peimer Clayton A. 
Published: November 2020

Abstract
Background There has been clinical question in the treatment of ulnar styloid fracture with distal radius fracture, surgical fixation of the styloid fragment, or ignorance of the fragment. We examined relationship between size of the ulnar styloid fracture and distal radioulnar joint (DRUJ) stability biomechanically to answer the above clinical question.
Methods Changes in the dorsopalmar stiffness of the DRUJ after experimentally simulating in four types of ulnar styloid fractures were examined in cadavers. After tip, middle, base-horizontal, and base-oblique type of styloid fractures were made sequentially, changes in dorsopalmar DRUJ stiffness were measured using the MTS machine in the intact wrist, for each fracture, at 60 degrees pronation, neutral, and 60 degrees supination, respectively. Additional cutting of the radioulnar ligament (RUL) at the fovea was also simulated with the base-horizontal fracture.
Results The tip and middle type fractures did not demonstrate significant loss of stiffness compared with the intact. The base-horizontal fracture demonstrated only significant loss of stiffness in the dorsal direction (radius palmar; ulnar dorsal) with forearm in neutral rotation. The base-oblique fracture demonstrated significant loss of dorsopalmar stiffness of the DRUJ. Additional section of the RUL with the base-horizontal fracture induced significant loss of stiffness of the DRUJ compared with the intact.
Conclusions Because the RUL originates from the fovea as well as from the base of the ulnar styloid, these results suggest that DRUJ instability closely correlates with how much of the bony fragment includes the originating portions of the RUL. The findings further suggest that larger base-oblique and base-horizontal fragments with resultant DRUJ instability must be reattached, but that even base-horizontal fragment as well as tip and middle ulnar styloid fragment can be ignored when there is no instability.
Use of Dexamethasone to Prevent Extubation Failure in Pediatric Intensive Care Unit: A Randomized Controlled Clinical Trial
Authors: Carvalho Haroldo Teófilo de , Fioretto José Roberto , Bonatto Rossano Cesar , Ribeiro Cristiane Franco , Martin Joelma Gonçalves , Carpi Mário Ferreira 
Published: November 2020

AbstractExtubation failure is a common event in intensive care units. Corticosteroids are effective in preventing failure in adults, but no consensus has been reached on this matter in pediatrics. We assessed the efficacy of intravenous dexamethasone in mechanically ventilated children and adolescents for more than 48 hours, with at least one risk factor for failure. Extubations were scheduled 24 hours in advance when possible, and patients were randomly assigned into two groups: one group received a loading dose followed by up to four doses of dexamethasone, and the other group received no corticosteroids. Need for reintubation and length of stay in the pediatric intensive care unit were similar in both groups, and frequency of reintubation was 12.9%.
Inpatient Telehealth Tools to Enhance Communication and Decrease Personal Protective Equipment Consumption during Disaster Situations: A Case Study during the COVID-19 Pandemic
Authors: Ong Shawn Y. , Stump Lisa , Zawalich Matthew , Edwards Lisa , Stanton Glynn , Matthews Michael , Hsiao Allen L. 
Published: November 2020

Abstract
Background As the coronavirus disease 2019 pandemic exerts unprecedented stress on hospitals, health care systems have quickly deployed innovative technology solutions to decrease personal protective equipment (PPE) use and augment patient care capabilities. Telehealth technology use is established in the ambulatory setting, but not yet widely deployed at scale for inpatient care.
Objectives This article presents and describes our experience with evaluating and implementing inpatient telehealth technologies in a large health care system with the goals of reducing use of PPE while enhancing communication for health care workers and patients.
Methods We discovered use cases for inpatient telehealth revealed as a result of an immense patient surge requiring large volumes of PPE. In response, we assessed various consumer products to address the use cases for our health system.
Results We identified 13 use cases and eight device options. During device setup and implementation, challenges and solutions were identified in five areas: security/privacy, device availability and setup, device functionality, physical setup, and workflow and device usage. This enabled deployment of more than 1,800 devices for inpatient telehealth across seven hospitals with positive feedback from health care staff.
Conclusion Large-scale setup and distribution of consumer devices is feasible for inpatient telehealth use cases. Our experience highlights operational barriers and potential solutions for health systems looking to preserve PPE and enhance vital communication.
Chinese whispers: COVID-19, global supply chains in essential goods, and public policy
Authors: Evenett Simon J. 
Published: November 2020

AbstractIf taken at their word, senior policymakers in the major economic powers have drawn adverse conclusions concerning the performance of cross-border supply chains during the first 6 months of the COVID-19 pandemic. That such supply chains often implicate China, the origin of the pandemic, has also led to claims that trading partners have become too dependent on Chinese supplies. This in turn has led to policy interventions designed to reconfigure supply chains, which if adopted broadly could revise the terms upon which international business operates. A critical evaluation of this policymaker assessment is presented, based on near-time monitoring of medical and food trade disruption induced by government policy, on fine-grained trade data on the pre-pandemic international sourcing patterns of medical goods and medicines by France, Germany, the United Kingdom, and the United States, on statements from U.S. government health experts before and during the pandemic on the frequency and sources of medicine shortages, and on the U.S. Food and Drug Administration’s latest evidence on the causes of medicine shortages in 2020. Such evidence vitiates the adverse conclusions mentioned above, but raises important questions about the factors that determine policy towards international business during a time of intensifying geopolitical rivalry.
The Bangkok Blast as a finger-pointing blame game
Authors: Huan Changpeng , Deng Menghan , Sritrakarn Napak-on 
Published: November 2020

AbstractThis article sets out to explore the potential of journalistic attitudinal positioning in dis/aligning readers into different feeling and moral communities in traumatic news event. To do so, it utilises theappraisalframework to examine how theBangkok Postand theNew York Timespresent and represent ‘attitude’ of different news actors in the coverage of theBangkok Blast. Analytical findings show that while journalistic attitudinal positioning constitutes a means of political empowerment through bringing in otherwise marginal and silenced voices, it also opens up a space for journalists to evaluate risks and negotiate responsibilities. News reports of theBangkok Blasteventually construe the Thai society as divided by representing the event as a blame game. The findings also extend the conceptual scope of symbolic codes of victims, villain and hero by resorting to attitudinal resources.
Tunable circular dichroism in a graphene extrinsically chiral L-shaped metasurface
Authors: Zhou Jiaxin , Wang Yueke , Sang Tian , Lu Mengjia 
Published: November 2020

Abstract
In this manuscript, we propose a graphene metasurface composed of an L-shaped pattern to achieve a tunable circular dichroism under oblique incidence in the mid-infrared region. For our graphene extrinsically 3D-chiral structure, there are two graphene localized surface plasmons resonant modes at the wavelength of 11.05 and 16.69 μm. A broad bandwidth circular dichroism between the two modes is generated, so are two bands of negative circular dichroism (circular dichroism is minus). The circular dichroism can be enhanced by increasing the incident angle. Maximal circular dichroism can reach 24.64% when the incident angle is 60°. The mechanism of circular dichroism generation is attributed to the strong interaction between electric and magnetic dipoles. Besides, the circular dichroism can be tuned by changing the Fermi energy and is affected by the intrinsic relaxation time. It will have a wide application in photonic devices, which can promote the development of analytical chemistry and numerous other areas.
Research and Design of Fast Charge Controller Based on USBPD Protocol of FPGA
Authors: Xi Dewu 
Published: November 2020

Abstract
With the advent of the intelligent era, the function of electronic devices such as large-screen mobile phones, laptops, and tablet computers have become increasingly abundant and intelligent. However, at the same time, it has brought the problem of a sharp rise in power consumption. In the case of no breakthrough progress in existing lithium battery technology, people have begun to explore more “electricity replenishment” in the field of fast charging. The fast charging formula is: energy (W) = time (T) × power (P). To increase the charging speed, the key is to increase the charging power. Therefore, USBPowerDelivery (USB_PD) was born as the most mainstream fast charging technology today.
Simulation analysis of the seismic performance of electrical equipment by redundant length of flexible conductors in interconnected circuits
Authors: Liu Zhenlin , Sun Yuhan , Gao Po 
Published: November 2020

Abstract
The interconnection circuit of composite pillar insulators with five different redundant lengths of flexible conductors is established, and the simulation analysis of seismic effects is carried out to study the effect of flexible conductors on the seismic performance of electrical equipment when they are used in the interconnection circuit of electrical equipment. Numerical simulation results are used to analyze the changes in the stress and displacement response of pillar insulators when the redundant length of flexible conductors is varied, and the seismic response law of electrical equipment in the interconnection circuit connected by flexible conductors is obtained, which provides a reference for the seismic design of electrical equipment circuit.
Optimization Design of Track Control Algorithm Based on Convolutional Neural Network
Authors: Luo Nanhang , Zhao Kunming , Du Enwu , Li Yongquan 
Published: November 2020

Abstract
At present, the track control of unmanned surface vessel (USV) is mainly divided into direct track control and indirect track control, both of which have their advantages in the aspect of USV track control. Though having high control precision, the former still fails to meet the related requirements. To tackle this problem, the nonlinear model predictive control (NMPC) algorithm was optimized based on the convolutional neural network (CNN) in order to design a direct USV track controller. In consideration of the nonlinearity and time lag problems that are likely to occur in USV track control, the convolutional neural network was used to solve the optimal control sequence of the predictive control algorithm. The simulation test indicates that this algorithm has effectively improved the accuracy and real-time performance of track control.
Study on Transient Wind Field Model of Transmission Line Based on Multivariable Harmonic Superposition Method
Authors: Li Mu , Xiang Tao , Wang Yiping , Chen Kun 
Published: November 2020

Abstract
The wind deflection angle is directly related to the electric gap and the construction cost of the transmission line, so the accuracy of the wind deflection calculation method and the reasonable value of the relevant parameters are very important for the safe operation and economic rationality of the transmission line. Because of not considering the effect of wind speed fluctuation and thunderstorm impact wind and other adverse weather conditions, the calculation of wind deviation is often unsafe. In this paper, the multi variable harmonic superposition method is used to establish the transient wind field model under strong wind and thunderstorm blast weather conditions, considering the temporal and spatial correlation characteristics of wind field. On this basis, the distribution model of fluctuating wind load acting on the transmission line is constructed, which provides the basis for the subsequent wind deflection calculation of transmission line.
Voltage Stability Analysis of Synchronized Current Phasor Control Based on Bifurcation Theory
Authors: Wang Wei , Shi Qianhong , Zhu Guofang , Wang Zhijun , Ding Lei 
Published: November 2020

Abstract
Synchronized Current Phasor Control (SCPC) is a novel inverter control method proposed recently. This paper investigates the voltage stability of a simple SCPC grid based on the bifurcation theory. Firstly, the expression of the bifurcation point of the simple SCPC grid is derived, and then the variation of voltage stability domain is analysed according to the trajectory of bifurcation point when the inverter droop parameters change. The theoretical analysis results show that the droop parameters have an obvious influence on the voltage stability, which provides guidance for parameter setting.
Analysis of Current Carrying Capacity of Power Cable Based on DTS
Authors: Yaodong Zhang , Yi Kan , Xiaopo Mao , Xueming Zhou , Zhiqiang Feng , Zeqi Huang , Xiang Ren , Tianru Shi , Jianjin Fu , Junjie Huang 
Published: November 2020

Abstract
This article uses a distributed optical fiber temperature measurement system (DTS, Distributed Temperature Sensing) to fix the temperature measurement optical fiber on the surface of the power cable, collect the real-time operating temperature of the power cable, conduct the ampacity test, and analyze the cable laying method and depth, soil temperature, Soil thermal resistance coefficient, cable spacing and irradiation strength and other test conditions, the impact on the current carrying capacity of power cables. According to the real-time monitoring temperature of the cable, the alarm can be made when the cable temperature is too high or the temperature rise speed is too fast. And on the basis of determining the working temperature and load operating conditions of the cable conductor core, dynamically calculate the current carrying capacity of the cable, which is conducive to improving the performance of the power cable and increasing the load capacity of the power cable.
Simulation analysis of electromagnetic-temperature field coupling of medium voltage switchgear based on finite element method
Authors: Li Peng , Jia Tingbo , Zhang Zhongyu , Li Wentao , Gao Ying , Zheng Nan 
Published: November 2020

Abstract
In order to study the electric field distribution and temperature distribution of medium-voltage switchgear under normal operating conditions, taking 10kV switchgear as an example. Firstly, a three-dimensional physical model was established based on the solid structure of the switchgear. Secondly, the switchgear was made using the finite element method to simulate and analyze the electromagnetic field and temperature field. Consider various factors that affect the electric field distribution, and obtain the electric field distribution inside the switchgear and the temperature field distribution map on the current-carrying circuit.
A microgrid alarm processing method based on equipment fault prediction and improved support vector machine learning
Authors: Yuan Haochen , Zhang Zehai , Yuan Peng , Wang Shiqian , wang Lili , Yuan Yutong 
Published: November 2020

Abstract
Microgrids are important parts of modern strong intelligent power system. In recent years, new energy sources have developed rapidly in China, and research on microgrid technologies is in the ascendant. The typical microgrid has obvious advantages such as flexible network structure and small circuit loss. With its increasing scale and increasing application in the power system, it needs to be dealt with the complex operation mode. In order to achieve efficient operation and management, microgrid control still needs to be equipped with energy management system (EMS). One of the main problems that EMS needs to solve is the generation of massive alarm information within a short period of time after equipment failure. To this end, this paper proposes a microgrid alarm processing method based on equipment fault prediction and improved support vector machine learning. Based on historical operation risk and health state evaluation, the equipment fault prediction is carried out. Then we optimize and select kernel function for machine learning and have an improved SVM model. With this model, fault equipment sets are classified and verified so we can get the accurate source alarm and fault equipment. Finally, the validity and accuracy of this method are verified by a simple example.
Research on improved voltage-type rotor flux linkage observer method for engineering application
Authors: He Gang , Dong Xingyan , Wang Hui , Zhao Zhigang , Luo Zhiwei 
Published: November 2020

Abstract
Accurate rotor flux linkage observation is conducive to high-performance control of the motor. Among them, the voltage-type rotor flux linkage observer is widely used in engineering practice because of its simple structure and no need for speed information. However, the traditional voltage-type rotor flux linkage observer has an inherent pure integrator, which will affect the accuracy of flux linkage observation. This paper analyses the common low-pass filter instead of pure integrator, and the improved method of high-low-pass filter series compensation. Then, focus on derivation to get an improved voltage-type rotor flux linkage observer based on DC offset compensation. Finally, based on the theoretical analysis, the magnetic flux observation effects of the four observers are simulated and verified. The result proves that the method proposed in this paper can realize the accurate observation of the rotor flux linkage.
Study on the DFT-based phasor estimation algorithm for removal of the decaying DC offset
Authors: Peng Fang , Li Chong , Wang Wenjing 
Published: November 2020

Abstract
Protection relays respond to the fault condition of power system using real-time voltage and current signals. Estimation of the voltage and current phasors is necessary. However, the decaying DC component contained in the signal causes overshoot and oscillations in the magnitude and angle of the phasor estimated by the traditional DFT algorithm. Two types of estimation algorithms removing effect of the decaying DC component are studied and compared in this paper. The two improved algorithms include an error estimation (EE) algorithm featured with estimating the decaying DC component characteristics and a differential DFT (DD) algorithm featured with prefiltering of the current signal prior to phasor estimation. Performance of the two algorithms is evaluated using simulated signals from Matlab and PSCAD software. Accuracy of the phasor estimation is improved and the DD algorithm has more excellent performance than the EE algorithm.
Research on the Construction of Credit Evaluation System for Safety Performance
Authors: Yang Bo , Xie Huan , Zhao Lei , Zhu Rong , Ye Kuan , Li Hongbin , Li Dazhi , Ren Zhigang 
Published: November 2020

Abstract
In light of the fundamental requirements of the safe development of power grid enterprises, this paper introduces the concept of “credit” to innovatively put forward the concept of “responsibility credit” for the implementation of safety production responsibilities and the establishment of a credit evaluation system for safety performance from three dimensions: integrity, compliance and execution. Owing to the “refinement and implementation of the safety responsibility list, carrying out safety performance credit evaluation, and implementing the safety performance responsibility reward and punishment mechanism”, the safety performance management model pertaining to “knowledge, action, evaluation, optimization, performance” is formed to provide a reference for improving the intrinsic safety management in the power grid system.
Based on Optimized Mag-thermal Coupling Method Simulation Research on Temperature Rise of Switching Power Transformer
Authors: Qian Jiahao , Wang Xuming , Huang Liqiu , Xu Hong , Lou Jianyong 
Published: November 2020

Abstract
In this study, a bidirectional mag-thermal coupling method is used to simulate the temperature rise of the switching power supply transformer. According to the loss and temperature rise characteristics of the transformer, theoretical analysis and simulation are carried out. A set of optimized windings and design methods based on the upper limit of temperature rise are proposed. The simulation results show that the optimized windings reduce the winding loss, and improve the efficiency of the transformer by 5%, and reduce the temperature rise by 10%. The average temperature rise curve is consistent with the experimental ones of the transformer. Compared with unidirectional coupling, the method greatly improves the simulation accuracy by 4%. This research has certain guiding significance for the thermal design of switching power transformer.
Analysis of coupling factors between high proportion wind power and ultra-high voltage DC
Authors: Fan Guowei , Fan Guoqi , Song Pengfei , Ren Chong , Kang Pengpeng , Cheng Lin , Zhang Facai 
Published: November 2020

Abstract
Due to the imperfect construction of supporting thermal power units, when wind power sources are in full swing, if DC low-power operation will inevitably lead to wind power abandonment, if DC high power operation is subject to fault transient overvoltage operation constraints, it will also cause power curtailment of wind power sources. In order to promote wind power consumption and lean management of DC influencing factors, this paper analyzes the number of supporting thermal units started, supporting unit power changed, wind power and connected substation power to find out the key factors of DC operating limit and wind power consumption. The validity of this paper was verified by a DC power grid simulation in a certain area.
Development of AT Traction Network Short Circuit Calculation Software Based on BS Architecture
Authors: Yang Haobo , Li Chenchen , Zhu Qinghua , Sun Qihang , Zhao Yinhua 
Published: November 2020

Abstract
In order to meet the production needs of the gradually developing electrified railway, an AT traction network short circuit calculation system based on B/S (Browser/Server) three-layer network structure is designed. Make full use of network resources, simplify the operability and arbitrariness of short-circuit calculation, and realize the timely storage and recall of data to facilitate management and statistical analysis.