bluuebunny/crossref_metadata_2025_split huggingface dataset:
Discussion on Power System Modeling and Body Optimization of High-speed Electric Vehicle
Authors: Wu Zexu , Zhao Guangfu , Li Guangxue 
Published: February 2022

Abstract
This paper analyzes the operation mode of high-speed electric vehicle power system, combining with the key points of high-speed electric vehicle power system modeling, including controller (VCU) model, engine model, motor model, power battery model, clutch model, wheel model, power loss model, etc. By studying multi-objective optimization processing, applying genetic algorithm, optimizing variable selection, optimizing problem description, defining constraints, optimizing result analysis, etc., its purpose is to improve the content of high-speed electric vehicle power system and promote the stable development of electric vehicle industry economy.
The Design of Intelligent Spray Painting System for Ship Panel Based on UAV
Authors: Wei Yu , Tang Ying , Zou Tian , Li Xue , Zhao Wei , Zhou Honggen , Liu Jinfeng 
Published: February 2022

Abstract
This paper proposes a new form of using UAVs to carry spray painting process equipment to spray outer plates of ships, which solves the paining points of poor practicality, poor versatility and low intelligence of existing robotic spray painting and has received wide attention from experts in the industry. It includes two types of hardware equipment and three software systems, among which the hardware equipment includes intelligent spray painting platform and material supply platform, and the software system includes intelligent planning system of spray painting path, intelligent spray painting stability control system and “double platform” dynamic joint control system. Through experimental verification, the intelligent spray painting system of ship outer plate based on UAV proposed in this paper realizes intelligent spray painting of ship outer plate, improves safety, economy and efficiency of ship outer plate spray painting, and further promotes intelligent transformation of ship construction and high-quality development of ship industry.
Research on vibration isolation and noise reduction technology for the metro depot
Authors: Peng Guangzhao , Fu Kun , Li Zhuang , Ba Jian , Huang Zhibin , Zeng Zhiping , Yin Huatuo , Tang Qihui 
Published: February 2022

Abstract
Under the situation of increasingly tight land resources, the development of depot superstructures has been applied in many cities.The noise generated by the passage of subway vehicles and the vibration of buildings are problems that need to be solved urgently. The use of vibration and noise reduction measures for the track is an important solution.In order to study the vibration reduction effect of the depot vibration reduction measures, taking the Guangzhou Metro Chentougang Depot as an example, the vibration and noise reduction technology of the depot is studied.The research results show that: (1) It can be seen from Table 1 and Table 2 that after the vehicle speed is corrected to the same speed, the Z vibration level of the trapezoidal sleeper section at the foot of the ballast slope is lower than that of the ordinary transverse sleeper section, and the train speed is 10km/h (low speed). The insertion loss VLZ is 8.24dB, and the insertion loss VLZ is 8.53dB under the train speed of 35km/h (high speed).(2) At the measuring point 7.5m away from the centerline of the track, the Z vibration level of the trapezoidal sleeper section is smaller than that of the ordinary transverse sleeper. The insertion loss VLZ under low-speed conditions is 8.60dB, and the insertion loss VLZ under high-speed conditions is 8.93dB.
Numerical simulation of flow field of molten steel in the caster mould
Authors: Li Xin , Li Hao , Tao Chenggang , Zhang Guoqing 
Published: February 2022

Abstract
In order to analyse the molten steel flow in the mould, a 2D model including the mould and the SENwas established. The fluctuation of molten steel on the meniscus of the mould and the steel flow velocity field in the mould and nozzle were analyzed. The calculation results show that: (1) the steel flow velocity field in the mouldwas the highest in the nozzle area. When liquid steel flows out of the SEN, its flow velocity decreases gradually. (2) There were three regions flow in the mould. There were two reflux areas outside the nozzle, the dividing line is the free surface, and the other reflux area is 0.2 m∼0.9 m. The liquid steel within 0.9 m∼1.5 m flows vertically downward. (3) The free surface near the nozzle is high, while the free surface away from the nozzle is low. The free surface is the lowest at 0.1 m and the highest at 0.06 m.
Research on Ultrasonic-Assisted Grinding Process of SiCp/Al Composites
Authors: Zhu Chuanmin , Tao Zhan , Gu Peng , Yu Yiqing 
Published: February 2022

Abstract
SiCp/Al is a kind of particle reinforced composites with good material properties, which can be used in the field of lightweight parts and electronic packaging. Ultrasonic- assisted grinding process is one of the processes which is suitable for machining hard and brittle materials, the surface quality can be improved by using appropriate ultrasonic-assisted process parameters. In this paper, the ultrasonic-assisted grinding process is used to improve the surface quality of SiCp/Al, meanwhile, the kinematics of abrasive particles in grinding is analysed to explain the effect of ultrasonic vibration. In addition, ultrasonic-assisted grinding experiment of SiCp/Al is conducted, it is found that the axial ultrasonic vibration can improve the surface quality of SiCp/Al in grinding, and the reduction percentage is up to 8.20% compared to the normal grinding. In addition, a regression model is proposed for surface roughness prediction, the result of t-test on the residuals shows that the model is accurate.
Research on Friction Characteristics of Reinforced-soil Interface under Various Pull-out Rate and Embedded Length
Authors: Zhao Yunfei , Yang Guangqing , Wang Zhi , Liang Xunmei 
Published: February 2022

Abstract
In highway engineering, the reinforced soil structure has been widely used, especially the reinforcement on the top of the roadbed, which can effectively prevent the pavement from cracking. The friction characteristic of the reinforced soil interface is a necessary part in the design of the reinforced soil structure. In order to study the friction characteristics of biaxial geogrid-soil under various pull-out rate and embedded length, based on self-developed test equipment, a series of pull-out tests were carried out by using the research method of controlled strain. The test results indicated that the pull-out rate has little impact on the shear strength of the reinforced soil. Moreover, the pull-out force increased with longer embedded length. The rest results have provided a reference to the design work using biaxial geogrid in the field of civil engineering, especially in highway engineering.
Research on Measurement Methods of Friction Coefficient
Authors: Cao Hongjun , Xu Zijian , Hu Yinjie , Zhong Minjia , Liu Sheng 
Published: February 2022

Abstract
The concept and classification of the friction coefficient are introduced by the slope method and the plane method. In general, the development trend of friction coefficient measurement methods can be summarized as three characteristics: from simple to complex, from rough to precision, and from single function to platform integration. It also suggests the direction of friction coefficient measurement.
Machining factor on the high cycle fatigue life of X80 pipeline steel
Authors: Qiu Yu , Ju Xinhua , Meng Yang , Wang ZeYang , Zhang Qingshui 
Published: February 2022

Abstract
Pipeline steel is used to make long pipes transporting fossil oil and natural gas, and the stability of its fatigue life is important to evaluate the pipeline service reliability. However, a fatigue life scatter often occurs at low stress amplitudes in X80 pipeline steel. In this investigation, the possible influencing factors have been studied with observation on the fatigue fracture morphology, microstructure and dislocation pattern, and analysis on the distribution of micro-Vickers hardness. It is found that the remaining transverse machining marks greatly affects the fatigue lives at low stress amplitudes. It is mainly because the critical threshold stress factor is greatly influenced by the depth of transverse machining mark. Removing the remaining transverse marks totally as much as possible can greatly improve the fatigue life scatter.
Research on Flow Distribution Characteristics of CFD-based Heat Exchanger Integration Scheme
Authors: Wang Yun , Liu Chao , Yang Yifei , Guo Chenxin , Zeng Yu 
Published: February 2022

Abstract
The modular integrated design of the five heat exchangers of the air conditioning system, auxiliary cooling system, and air quasi system in the aircraft’s environmental control system resulted in three solutions: comprehensive plan 1, comprehensive plan 2, comprehensive plan 3; In this paper, Ansys software is used to model and mesh the three integrated design schemes of heat exchangers; To simplify the mesh model of the entire runner, this article first briefly describes the assumptions, equations and calculation principles of using porous media to replace the heat exchanger model, secondly, the porous media and other settings are performed in Ansys to calculate the flow distribution characteristics of the three heat exchanger integrated design schemes under multiple working conditions.
The forest recovery path after drought dependence on forest type and stock volume
Authors: Luo Hui , Zhou Tao , Yu Peixin , Yi Chuixiang , Liu Xia , Zhang Yajie , Zhou Peifang , Zhang Jingzhou , Xu Yixin 
Published: February 2022

Abstract
Drought legacy effects of forest ecosystems have been widely observed. However, the influence of forest type and stock volume on its recovery path is poorly understood. In this research, we first used the Standardized Precipitation Evapotranspiration Index to identify a drought event. Then, we applied the normalized difference vegetation index deficit and forest property maps derived from forest inventories to investigate the potential impacts of forest properties on forest recovery paths. The results showed that the legacy effects 1–3 years after a drought event were pervasive, but the forest recovery path was highly dependent on the forest type and forest stock volume. The recovery of forests with low stock volume densities (<60 m3 ha−1) was mostly stronger than that of forests with high stock volume densities (≥60 m3 ha−1) by the second year. Although all forests with different stock volume densities approximately returned to a normal status by the third year, they followed various paths to recovery. Natural coniferous forests in China that have a similar stock volume density (<60 m3 ha−1) took longer to recover than planted coniferous forests and exhibited a lower magnitude of recovery. These findings highlight that drought legacy effects are greater for natural coniferous forests with high stock volume densities, which provides insightful forest management information on how to speed up forest recovery with forest density control and type control.
Winding number of a Brownian particle on a ring under stochastic resetting
Authors: Grange Pascal 
Published: February 2022

Abstract
We consider a random walker on a ring, subjected to resetting at Poisson-distributed times to the initial position (the walker takes the shortest path along the ring to the initial position at resetting times). In the case of a Brownian random walker the mean first-completion time of a turn is expressed in closed form as a function of the resetting rate. The value is shorter than in the ordinary process if the resetting rate is low enough. Moreover, the mean first-completion time of a turn can be minimised in the resetting rate. At large time the distribution of winding numbers does not reach a steady state, which is in contrast with the non-compact case of a Brownian particle under resetting on the real line. The mean total number of turns and the variance of the net number of turns grow linearly with time, with a proportionality constant equal to the inverse of the mean first-completion time of a turn.
Improving the productivity of upland rice through the implementation of Largo Super technology in dry land of Aceh Province
Authors: Idawanni  , Ferayanti F , Ismail M , Bakar B A 
Published: February 2022

AbstractLargo Super is a technology component that was assembled into a technology package for integrated dryland rice cultivation based on jajar legowo 2:1 planting. The purpose of this study was to determine the increase in upland rice productivity with the application of Largo Super technology. This research was conducted in 1 Ha dry land at Sarah Panyang Village, Pidie Jaya Regency from September to December 2019. This study used a factorial randomized completely block design (RCBD) with 3 replications. The first factor was variety (V), namely V1 = Inpago 8; V2 = Inpago 9 while the second factor is the technology package (T) which consisteds of 2 (two) factors, namely T1 = Farmer technology and T2 = Largo Super Technology. harvest (GKP) / hectare. The results showed that the Inpago 8 (V1) variety had a significant effect on plant height growth, number of tillers, number of productive panicles, number of total grains, number of empty grain and yield of tons/ha. Meanwhile, the number of tillers, panicle length and number of filled grains of Inpago 8 (V1) and Inpago 9 (V2) varieties were not significantly different. The Largo Super technology package gave the highest yield (5.09 tons ha-1) followed by the farmer technology package (3.57 tons ha-1) and there was an increase in productivity of 42.57%.
Diversity and Composition of Arthropods Natural Enemies in Integrated Rice Fish Farming System (Minna padi) and Its Functions in Agroecosystems
Authors: Trisnawati D W , Fadilah M , Nurkomar I 
Published: February 2022

AbstractMinna Padi is an integrated rice fish farming system that implements environmentally friendly cultivation and creates a sustainable ecosystem. However, the effects of minna padi farming systems on the diversity of natural enemies have not been reported previously. This research was conducted to compare the diversity and abundance of natural enemies [parasitoids and predators] in minna padi and conventional rice fields. Three pairs of minna padi and conventional paddy fields were selected for fields research. Natural enemies were collected in the field research using sweeping nets, yellow sticky traps and pitfall trap every two weeks during the cultivation. The results showed that the abundance of parasitoids was higher in minna padi than that in conventional farming systems. However, the abundance of predators was higher in conventional farming systems. Parasitoid and predator species richness also showed no difference between the two rice farming systems. However, the composition between the two farming systems was different, minna padi was dominated by parasitoids such asAphonagmussp. andEurythoma dentata,while conventional dominated by a predator such asPardosa pseudoannulataandPlexippussp.
Laboratory stands for hydraulic fracturing simulation in a nonuniform stress field
Authors: Patutin AV , Serdyukov SV 
Published: February 2022

Abstract
The paper considers the capabilities of well-known laboratory facilities for hydraulic fracturing modeling under the true triaxial loading conditions. Of greatest interest are the stands that allow you to create a crack in large cubic samples with an edge length of 200 mm or more. In this case, it is possible to reduce the influence of edge effects from the boundaries of the sample on the propagation path of the discontinuity. The review includes research results obtained using 10 different facilities located in major scientific centers.
Study on the bonding mechanism of multilayer copper with nickel sheet in ultrasonic welding process
Authors: Ye Fuxing , Wang Yonghui , Lu Hewan , Guo Yongming 
Published: February 2022

Abstract
The metal-plastic flow and bonding strength of three-layer copper (Cu) with single-layer nickel (Ni) joints via ultrasonic welding were investigated in this study. With the increase of welding time from 0.3 to 0.5 s, the weld bonding density between different layers’ interface increased gradually and approached about 95 ± 1.5%. Electron backscatter diffraction (EBSD) analysis of different regions of the welded joint revealed that the metal grains in the 1st layer became relatively small and elongated, while the 2nd and 3rd layers tended to be equiaxed grains. The joint bonding strength of T-peel tests changed with welding time and had two kinds of fracture models (nugget pullout and interfacial fracture). Compared with the bonding strength of the 1st-2nd and 3rd-4th interface, the 2nd-3rd interface of joints had the highest bonding strength of 400.6 N with nugget pullout fracture model at welding time of 0.4 s. In addition, the much higher hardness of the 1st layer is attributed to the strong plastic deformation of the 1st layer, while the dynamic recovery and dynamic recrystallization of the metal of the 2nd layer resulted in the decrease of hardness.
Improvement of plasma uniformity and mechanical properties of Cr films deposited on the inner surface of a tube by an auxiliary anode near the tube tail
Authors: WU Houpu , TIAN Xiubo , ZHENG Linlin , GONG Chunzhi , LUO Peng 
Published: February 2022

Abstract
In order to improve the length of plasma in a whole tube and mechanical properties of Cr films deposited on the inner surface of the tube, a high-power impulse magnetron sputtering coating method with a planar cathode target and auxiliary anode was proposed. The auxiliary anode was placed near the tube tail to attract plasma into the inner part of the tube. Cr films were deposited on the inner wall of a 20# carbon steel tube with a diameter of 40 mm and length of 120 mm. The influence of auxiliary anode voltage on the discharge characteristics of the Cr target, and the structure and mechanical properties of Cr films deposited on the inner surface of the tube were explored. With higher auxiliary anode voltage, an increase in substrate current was observed, especially in the tube tail. The thickness uniformity, compactness, hardness and H/E ratios of the Cr films deposited on the inner surface of the tube increased with the increase in auxiliary anode voltage. The Cr films deposited with auxiliary anode voltage of 60 V exhibited the highest hardness of 9.6 GPa and the lowest friction coefficient of 0.68.
Wind load characteristics of photovoltaic panel arrays mounted on flat roof
Authors: Li Shouke , Dan Mao  , Li Shouying , Wang Qi , Yang Qingshan , Chen Yuankun , Zhou Shuai 
Published: February 2022

Abstract
To quantify design wind load of photovoltaic panel array mounted on flat roof, wind tunnel tests were conducted in this study. Results show that the first and the last two rows on the roof are the most unfavorable ones regarding to the wind load. Influences of array spacing, panels’ tilt angle and parapet height on wind load of the panels are studied. Most unfavorable lift force of panels decreases with increase of array spacing for middle located panels. The aerodynamics are similar to flow over repeated hills. Middle located unit got greater turbulence, which leading to unfavorable C

fp_min. While the changing amplitude of most unfavorable wind pressure is small increase with array spacing. C

fp_max and C

fp_min of panel units shows quite strong dependence on tilt angle. There is significant pressure equalization for small tilt angle cases. The local flow separation is responsible for C

fp_min of larger tilt angle cases. Parapet height of 2 h (h is the panel height projected on the vertical plane) is the critical height for C
fp_max and C
fp_min. Increasing parapet height can significantly reduce the wind load of panel units. Design pressure coefficient of the basic working condition with different area sizes at different location are proposed.
Health Behavior Profiles Among Midlife Women: Identifying At-Risk Subgroups for Metabolic Syndrome Using Latent Class Analysis
Authors: Min Se Hee , Docherty Sharron L , Im Eun-Ok , Yang Qing 
Published: February 2022

Abstract

Background
Metabolic syndrome is known as a lifestyle disease that results from poor health behaviors. Yet, little is known about the subgroups of midlife women with distinct health behavior profiles who are at risk for developing metabolic syndrome.

Purpose
This study aims to identify latent subgroups of midlife women with distinct health behavior profiles (physical activity, alcohol, diet, and smoking), to describe the characteristics of latent subgroups, and to examine the association between latent class membership and future development of metabolic syndrome.

Method
This is a secondary data analysis using baseline and follow-up data from years 1, 3, 5, and 7 (N = 3,100) from the Study of Women’s Health Across the Nation (SWAN). Latent class analysis was used to identify latent subgroups of midlife women based on their distinct health behavior profiles. Bivariate and multiple logistic regression was conducted to examine the individual characteristics of each latent subgroup and its association with the future development of metabolic syndrome.

Result
A 4-class model was selected: Class 1 (Healthy), Class 2 (Healthy except alcohol), Class 3 (Healthy except diet), and Class 4 (Unhealthy). Significant differences in individual characteristics were found among the four latent classes (p &lt; .001). The regression analysis found that Class 2 had lower odds of developing metabolic syndrome at all future visits with statistical significance reached at visit 3 (p &lt; .05) while Class 4 had higher odds of developing metabolic syndrome at all visits except visit 3 when both compared to Class 1.

Conclusion
Clinicians should use the study findings to offer personalized approach to promote healthy behaviors and to guide future development of health promotion programs for midlife women.
Unheeded SARS-CoV-2 proteins? A deep look into negative-sense RNA
Authors: Bartas Martin , Volná Adriana , Beaudoin Christopher A , Poulsen Ebbe Toftgaard , Červeň Jiří , Brázda Václav , Špunda Vladimír , Blundell Tom L , Pečinka Petr 
Published: February 2022

Abstract
SARS-CoV-2 is a novel positive-sense single-stranded RNA virus from the Coronaviridae family (genus Betacoronavirus), which has been established as causing the COVID-19 pandemic. The genome of SARS-CoV-2 is one of the largest among known RNA viruses, comprising of at least 26 known protein-coding loci. Studies thus far have outlined the coding capacity of the positive-sense strand of the SARS-CoV-2 genome, which can be used directly for protein translation. However, it has been recently shown that transcribed negative-sense viral RNA intermediates that arise during viral genome replication from positive-sense viruses can also code for proteins. No studies have yet explored the potential for negative-sense SARS-CoV-2 RNA intermediates to contain protein-coding loci. Thus, using sequence and structure-based bioinformatics methodologies, we have investigated the presence and validity of putative negative-sense ORFs (nsORFs) in the SARS-CoV-2 genome. Nine nsORFs were discovered to contain strong eukaryotic translation initiation signals and high codon adaptability scores, and several of the nsORFs were predicted to interact with RNA-binding proteins. Evolutionary conservation analyses indicated that some of the nsORFs are deeply conserved among related coronaviruses. Three-dimensional protein modeling revealed the presence of higher order folding among all putative SARS-CoV-2 nsORFs, and subsequent structural mimicry analyses suggest similarity of the nsORFs to DNA/RNA-binding proteins and proteins involved in immune signaling pathways. Altogether, these results suggest the potential existence of still undescribed SARS-CoV-2 proteins, which may play an important role in the viral lifecycle and COVID-19 pathogenesis.