bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical study of the momentum and heat transfer between an oblate ellipsoid and a gas in uniform flow
Authors: Xiong Ting , Chen Chenchen , Chen Yong , Fang Zhenlong 
Published: August 2023

Abstract
In this study, drag coefficient (cd
) and Nusselt number (Nu) for oblate ellipsoids with different incident angles (θ) and particle aspect ratios (Ar) in uniform flow have been computed over a wide range of Re ∈[10,500]. Finally, a new drag coefficient correlation is proposed, which covers a wider range of oblate ellipsoids. Surprisingly, we observe that the incident angle has a negligible effect on the Nusselt number for the oblate ellipsoids in the Reynolds number range studied. The Nusselt number for oblate ellipsoids with incident angle (θ) can be approximated accurately by the averaged Nusselt number for different incident angles. Thus, a new Nusselt number correlation for oblate ellipsoids for Re ∈[10,500] and Ar ∈[0.1,0.8] is proposed. The new correlations developed are expected to improve the accuracy of Euler-Lagrange simulations of gas-solid heat transfer comprising oblate ellipsoids.
Aircraft Accessibility Based on Generalized Regression Neural Network
Authors: Fan Zhonghang , Zhang Xuhui , Lu Ying , Hu Yuchuan , Liu Xuanlin 
Published: August 2023

Abstract
According to the requirements of aircraft accessibility judgment, based on the existing research, this paper proposes two accessibility judgment methods based on the “initial position velocity threshold range” and “expected landing site velocity threshold range”. Firstly, the motion model of the aircraft is established, and the accessibility judgment sample library is established by using the trajectory planning method. Then, the initial and landing velocities are selected as the prediction targets, and the neural network is established to achieve accessibility prediction and judgment. Finally, the simulation analysis of the unpowered aircraft diving stage scene is carried out. The results show that the accessibility judgment model designed in this paper has high prediction accuracy and preliminary accessibility judgment ability. This paper realizes the optimization of the existing scheme and provides a method for the research field of accessibility judgment.
Optimization of Aerodynamic Profile of Ground Vehicle
Authors: Gan Yifan , Li Linghao 
Published: August 2023

Abstract
In this paper, the aerodynamic profiles of different types of ground vehicles, racing cars, freight cars, and bullet trains, as well as their shape design and use, will be introduced and discussed by using the equation

F
d

=

C
d

⋅

1
2

ρ

V
2

A

. The methods adopted by predecessors o find the best aerodynamic profile for these vehicles are also introduced. The conclusion is that the best aerodynamic profile for race cars is equipped with spoilers and a relatively great slicing angle at the rear bottom of the vehicle. Furthermore, diffusers are optional but can also decrease the drag force. For lorries, the best modification is completely sealing the gap between the trailer and undercarriage with a dynamic rear flap. If possible, add roof tapering on the trailer, but it will reduce the amount of cargo shipped. For a bullet train, the longer the nose of the train is, the less drag it will experience.
Equalization control of rudder force fight under hydraulic servo-actuation system
Authors: Qu Liang , Li Nan , Ye Ji Hai , Xu You Ping 
Published: August 2023

Abstract
The main steering rudder surface of civil aircraft usually adopts the design of redundant degree actuator channels to meet the requirements of high safety of flight control systems. However, the use of the main-main actuator operating leads to a force fight phenomenon, which can bring fatigue and other effects on the rudder surface structure and even threaten flight safety. In this paper, the rudder operating system with three residual degrees of main-main-main operation is taken as the object. A proportional-integral equalization algorithm based on the dual compensation of actuator pressure difference and position is investigated to mitigate the force fight phenomenon. The effectiveness of this force fight equalization method is verified by Simulink simulation and the iron bird experiment.
A Method for Generating Error-caused Scenarios
Authors: Du Junchao , Zhu Chongyuan , Bao Yang , Hu Qianchao , Liu Binglin , Liu Haitian , Wang Feng 
Published: August 2023

Abstract
In recent years, with the development of artificial intelligence, Unmanned Autonomous Systems (UAS) have also developed rapidly. It is necessary to conduct sufficient testing and evaluation of UAS before using it. This paper proposes a method for generating error-caused scenarios that lead to incorrect behavior in UAS, and how to evaluate the level of incorrect behavior in UAS caused by the scenario. Based on the method proposed in this paper, error-caused scenarios can be generated in the simulation platform, and the dataset constructed from these scenarios can be input into the target detection model to verify the effectiveness of error-caused scenarios. Our experiments have shown that the scenarios generated by the method can easily lead to errors in UAS, and the method can play an important role in the field of model-based UAS testing and validation.
Graph Transformation Based on Heterogeneous Information Network for Graph Algorithms
Authors: Liu Zhenguo , Ma Chao , Zhao Jimiao , Hu Haiyang , Yin Xiongyi 
Published: August 2023

Abstract
In the finical risk control, the graph structure data increasingly show its unique charm, especially the heterogeneous information network (HIN). And, graph computing algorithms for the data mining based on network is the most popular way at the moment. But, most of them require the graph network must have homogeneity and could not be applied to heterogeneous networks. Although the neural network models have some work in the HIN, which like heterogeneous graph neural networks, but these ways cannot provide enough interpretability due to its operations in black-box. In this paper, we summarize strategies to transform the HIN into homogeneous network. And we propose methods aim to rebuild HIN as several homogeneous networks at fine-grained level and greatly retain the original network topological structure information compared the previous which easy to lose sight of. The effectiveness of our method is verified by real data and community detection algorithms. In the experiment, the analysis found that our approached consistently perform promising results compared with the coarse-grained data processing on HIN.
FG-PFC: A Fine-Grained PFC Mechanism for Lossless RDMA
Authors: Li Shibao , Wang Chengzhi , Zhang Yunwu , Ma Chenxu , Li Longfei , Cui Xuerong , Liu Jianhang 
Published: August 2023

Abstract
Remote Direct Memory Access (RDMA) is widely deployed in data centers to improve the performance, efficiency, and reliability of data centers. Priority-based Flow Control (PFC) can ensure no packet loss as a necessary approach to achieve lossless RDMA. However, since PFC is a coarse-grained flow control mechanism based on port and priority, it can cause the head-of-line blocking problem and affect other flows, resulting in high latency. In this paper, we propose a fine-grained PFC mechanism (FG-PFC), which refines port and priority into flow granularity and further determines and pauses the flow most likely to cause congestion. The benefit is reducing the persistent high occupancy of the buffer and protecting the innocent flow. Simulations and experiments demonstrate that FG-PFC outperforms PFC in terms of flow completion time (FCT).
System Health Assessment Model Based on Anomaly Detection
Authors: Yu Hai , Cheng Xinyuan , Liu Juan , Cai Zhengong , Lv Fengmin 
Published: August 2023

Abstract
Accurately assessing system health and taking timely interventions play a crucial role in promoting intelligent system operation. Traditional system health assessment techniques depend on human-set thresholds, which are only appropriate for tracking a few indicators and do not accurately represent the system’s health overall. Therefore, keeping track of a large amount of data and a diverse variety of indicators will be extremely challenging. To address this issue, we develop the AD_Select anomaly detection algorithm and suggest a system health assessment model based on indicator anomaly detection. By fusing anomaly detection with system health assessment, this algorithm increases the scientific rigor and precision of health assessment. The experiments of AD_Select anomaly detection algorithm and healthiness assessment model are conducted on the 2018AIOps dataset and industrial dataset respectively, and the results show that both the AD_Select algorithm and the healthiness assessment model proposed in this paper achieve good performance.
Fan Rotation Speed Real-Time Optimizations of Continuous Annealing Line with Mechanism-Guided Multitask Classification and Regression Model
Authors: Chen Kai , Huang Feng , Zhang Heming 
Published: August 2023

Abstract
Fast cooling with gas jets in the rapid cooling section plays significant role in the process of steel strip galvanization. The large number of the cooling fans to generate the gas jets and the frequent change of the strip dimension, the strip velocity and the inlet strip temperature contribute to the great complexity of the fan rotation speed regulations. The experience-dominated regulation method does not work well in real production. This paper proposes a multitask classification and regression (MTCR) model to optimize the fan rotation speed in real time. A heat transfer model is firstly built in the form of partial differential equations (PDEs) and is used to construct the features of the MTCR model. The overall heat transfer coefficient is calculated and analysed. More than 575, 000 data records from the real production line are used to construct the features, and train and evaluate the MTCR model. In addition, the predictions of the MTCR model are compared with that of the multitask regression (MTR) model and the single task regression (STR) model. All the models perform well for the rotation speed predictions of the switched-on fans, while the MTCR model performs better in the whole test dataset.
Design and verification of DFE re-decision algorithm for PAM6 high-speed transceiver based on FPGA
Authors: Zou Dongwei , Song Kezhu , Zhu Chengyang , Chen Zhuo , Zhong Xiangshi , Wu Tong 
Published: August 2023

Abstract
In this paper, a decision feedback equalizer (DFE) re-decision algorithm for a 6-level pulse-amplitude-modulation (PAM6) high-speed transceiver is proposed. PAM6 is a two-dimensional (2D) modulation. The four outer points are not used in the 2D constellation diagram to reduce the output power. Although the four outer points will not be modulated, they may be encountered during demodulation. This paper considers the above situation and theoretically analyzes the DFE module under the additive white Gaussian noise (AWGN) channel. Compared with the traditional pipelined DFE structure, the proposed algorithm can help solve the four outer points in PAM6. A serializer/deserializer (SerDes) simulation system is built based on a field programmable gate array (FPGA), and the performance of the proposed algorithm is carried out on the simulation system. According to this proposed algorithm, the symbol error rate (SER) of the PAM6 SerDes system can be reduced, and the system performance can be improved. When the DFE tap coefficient is 0.50 and the signal-to-noise ratio (SNR) is 22.0 dB, the proposed algorithm can additionally correct 8.18 % of erroneous symbols. When the DFE tap coefficient is 1.00 and the SNR is 22.0 dB, the proposed algorithm can additionally correct 17.30 % of erroneous symbols.
Representativeness errors in the assessment of pollution discharge in wastewater
Authors: Rosental O M , Sambursky G A 
Published: August 2023

Abstract
The issues of determining the quality of wastewater are relevant for various countries within the framework of environmental regulation. The methods used for calculating the quality standards of wastewater discharged into reservoirs have different degrees of justification and, thus, can cause systemic errors in the analysis of the quality of treated wastewater. Another reason for possible inconsistencies is errors in the unrepresentativeness of analytical studies and sampling procedures. Based on the fact that average values, including annual averages, are used to determine the acceptable quality of wastewater treatment, this article shows options for negative impacts on water bodies from various objects, taking into account the real contribution to the volume of such negative impacts.
Prospects for the use of solar energy
Authors: Ovchinnikova S V , Schneider E M , Borovkov A V , Lyamina A A , Yu Dvornokova O 
Published: August 2023

Abstract
Nowadays, all over the world, including in Russia, there is an acute question of the development and implementation of new energy sources, and more and more people are using them. In the presented work, the question of the feasibility of using solar panels was studied, and an economic justification was given.
Phytosanitary indicators of fodder crops under using organic cultivation technology
Authors: Trufanov A M , Voronin A N , Shchukin S V , Romanina Ya S , Tikhonov A V 
Published: August 2023

Abstract
The article provides data based on a four-year study of five cultivation technologies of different intensity, including organic. On the example of seven crops of fodder crop rotation, the effectiveness of controlling phytosanitary indicators - the number and mass of weeds, the spread of diseases and the number of insect pests, which are an obstacle to the widespread use of ecological cultivation technologies, was studied. The results of the research made it possible to recommend perennial grasses up to 3 years of use for inclusion in fodder crop rotations in order to improve the phytosanitary condition of crops, and corn in order to obtain high fodder crop rotation productivity. For the cultivation of forage crops, the use of organic technology is fully justified, as it contributed to the reduction in the abundance of weeds, minimized the prevalence of diseases of annual and perennial grasses, corn, reduced the number of pests; provided increase in productivity compared to extensive technology.
Soil pollution by heavy metals
Authors: Grafkina M V , Pitryuk A V , Goryacheva E V 
Published: August 2023

Abstract
An increase in the content of heavy metals in soils is an environmental threat to agriculture, as it is associated with the accumulation of toxicants in plants, which negatively affects the quality of crop production and poses a danger to human health. Each region has its own specifics, expressed by the types of pollution and trends in their changes. The article presents data on the analysis and evaluation of the categories of Primorsky Krai lands for their intended purpose, the problem of soil pollution with heavy metals is considered. On the basis of open data, the levels of soil pollution by territorial formations were determined, the main sources of heavy metal pollution were identified, unsatisfactory soil samples that did not meet hygienic standards for the content of heavy metals for ten years were analyzed, and the trend of their change was revealed. The main types of pollution, the boundaries of the spread of pollution and the differences in the presence of heavy metals such as lead, copper, nickel, zinc and manganese in the soils of territorial formations of the region are revealed. Recommendations are formulated to reduce the technogenic negative impact of industry, which will reduce the content of heavy metals in soils. Proposals have also been made to improve the monitoring system for the content of heavy metals in the soil to obtain more complete information.
Co-vocalisation of Eagle Owl and other owls in the natural and climatic conditions of the Middle Volga region
Authors: Andreychev A V , Kuznetsov V A , Alpeev M A , Lapshin A S 
Published: August 2023

Abstract
The article considers the co-vocalisation of Eagle Owl and other species of owls. The studies were carried out using digital voice recorders in the habitats of the eagle owl. The natural and climatic conditions of the area in which co-vocalisation was noted were analyzed. Rare cases of co-vocalisation of Eagle Owl and its prey, primarily the Ural Owl and the Long-eared Owl, have been identified. Co-vocalisation was revealed only in winter and spring. This is due to the breeding season of birds. The presented study reflects the environmental sustainability of a particular area.
Selective oil saturation of Verkhnechimidikeenskoe oil manifestation
Authors: Vasilev R I , Sivtsev A I , Menkyarova V S 
Published: August 2023

Abstract
The article considers the problem of possible oil-bearing of the section’s upper part in the area of permafrost’s distribution on the example of the north-east of the Siberian platform. The actual data testifying to the existence of permeable intervals in the permafrost rocks (PFR) are presented. The main attention is paid to the unusual «hanging» distribution of oil inside the sand formation. This low-thickness lower Jurassic formation contains a concentration of oil of a lensoid shape. At the same time unaltered areas of the sand formation (without saturation) surrounding top and bottom saturated part do not differ in lithological characteristics. The assumption about the relevance of the Verkhnechimidikeenskoe Oil Manifestation to the relic inter-permafrost aquifer is made. As a modern analogue, the sufficiently detailed distribution zone of inter-permafrost aquifers on the northern slope of the Aldanskaya anteclise with similar lithological-stratigraphic performance is briefly described.
Formation of a recreational component in the natural and ecological framework of an industrial area in order to ensure its sustainable development
Authors: Podkovyrova M A , Kucherov D I , Volobueva O N 
Published: August 2023

Abstract
In the article, the necessity to improve the system of natural and ecological framework of Nefteyugansky district, Russia, is substantiated. It is caused, on the one hand, by the increased degradation of natural (land) resources under anthropogenic and technogenic impact of oil and gas complex, and, on the other hand, by the real need to develop tourist and recreational infrastructure in the economy and nature management of the district. The purpose of the study is to analyze the state of the land and property complex of the district, including an assessment of its natural resource, tourist, recreational, and socio-economic potential. Using domestic and foreign experiences, the authors propose a number of techniques that allow investigating the supporting frameworks as the basis for formation and development of a municipal district; determining the actual state of the natural and ecological framework; studying trends in the development of the economy, and the possibilities of expanding the socio-economic sphere regarding tourist and recreational activities, which, in turn, will allow optimizing the existing system of natural and ecological framework in the near future. A comprehensive landscape and ecological approach to improving the natural and ecological framework of the municipal district based on the formation of a tourist and recreational component in its structure, as well as optimization of natural and economic systems, will ensure the most sustainable development of the studied territory.
Landscape structure of the territory of the district Pustynsky of the projected National Park Nizhegorodskoe Zavolzh’e
Authors: Astashin A E , Vatina O E , Fomina A I , Badin M M , Astashina N I 
Published: August 2023

Abstract
The paper presents the results of landscape differentiation of the territory of the district Pustynsky of the projected National Park Nizhegorodskoe Zavolzh’e, performed at the hierarchical level of landscape types. The researched territory is located in the broad-leaved forest subzone of the forest-steppe zone, indigenous vegetation has been preserved on its territory - broad-leaved spruce, pine, pine-spruce forests. Currently, is being completed work on the creation of the Nizhny Novgorod Region’s first national park Nizhegorodskoe Zavolzh’e, which is designed as a cluster, including five sites. The specifics of the national park’s operating mode require functional zoning of the territory, taking into account the vulnerability of natural complexes, permissible recreational loads and distribution areas of rare plant and animal species, which determines the high demand for landscape zoning schemes necessary for the effective organization of environmental and recreational activities. The article presents a scheme of landscape zoning of the territory of one of the five districts of the projected national Park – Pustynsky.
Biological reserves of bracken fern (Pteridium Aquilinum (L.) Kuhn.) in the coniferous forests of Altai Territory
Authors: Sokolova G G 
Published: August 2023

Abstract
The article contains information on the biological reserves of bracken ferns in coniferous forests in the Altai Territory. For the study, 2 zones were taken - the Priobsky pine forest zone and the Salair ridge zone. The predominant types of forests in this area are pine and fir forests. During the study period, the biological and operational reserves of bracken fern and the amount of annual collection in various forest conditions were determined. The studies carried out have shown an extremely uneven distribution of biological, operational and commercial reserves of bracken fern by forest types and individual regions. A possible annual harvest of bracken ferns in different types of forest is recommended, depending on the frequency of harvest in a particular area. Measures for the rational use of biological reserves of bracken fern in the Altai Territory are proposed.
Resource potential and sustainability of recreational soils in the city of Uralsk
Authors: Gumarova Zh M , Akkereyeva E K , Jussupkaliyeva Roza , Zhazykbayeva G M , Sharafiyeva Zh R 
Published: August 2023

Abstract
The study of the resource potential and sustainability of soils in the green areas of the city of Uralsk is necessary to determine further steps to preserve the green fund. The recreational load was studied on the territory of the Kirov Park., Zh. Moldagaliev, Isatai and Makhambet, as well as the embankment of the Chagan and Ural rivers. In soils, such characteristics as moisture content, density, water permeability, organic carbon and salinity were studied. Soil water permeability was studied by the tube method. The density of recreational soils in the city of Uralsk was studied by the cutting ring method. Additionally, studies were carried out on the buffer capacity, salinity and organic carbon of soils. These studies were carried out by conventional methods. The results of comparing data on water permeability, density, salinity and resource capacity show a tendency for their condition to deteriorate at sites experiencing a constant recreational load. The recreational load is especially critical in the territories of public gardens Zh. Moldagaliev, Isatai and Makhambet and the embankment of the Ural River in the area of the Stela memorial complex.