bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel cascade optimization method based on butterfly optimization algorithm
Authors: Sun W , Zhou M S , Pan J X , Wang Y B 
Published: January 2022

Abstract
The parameter optimization of a multi-component isotope separation cascade is a multi-dimensional problem, involving many variables such as cut for stages, feed stage and separation factors. In this paper, a novel metaheuristic algorithm called butterfly optimization algorithm (BOA) is applied for the first time in cascade optimization field. Different objective functions are introduced like D function and a combination of D function and total flow rates. BOA method solves the problem of a 20-stage square cascade optimization to separate Xenon isotopes with the aim of getting the greatest D value or the least flow rates. The optimization results show that the optimal cut is close to the sum of the concentrations of the lightest N′C
isotopes. A 21-stage step cascade is optimized as well to obtain the best working conditions to separate 72Ge and the cut θ is consistent with the experiment results. The calculation results indicate that BOA shows good performance in terms of calculation stability, speed and convergence to global optimum compared with traditional optimization methods and other metaheuristic algorithm like TLBO.
Dysprosium enrichment and collection using AVLIS in Brazil: Preliminary results
Authors: Jakutis Neto J , Bueno P , dos Santos J R , da Silveira C A B , Rodrigues N A S , Victor A R , Destro M G , Neri J W 
Published: January 2022

AbstractRare Earth elements (RE) play an important role in the high-tech industry. Displays, fine electronic devices, sensors, optoelectronics, and many other fields rely on the use of these elements to deliver the technology we depend on. The possibility of improving the capacity of all these applications is attractive and there are a few ways to achieve that, one of them is to purify the REs to get only one isotope. Given that, one of the few techniques able to separate RE isotopes is the Atomic Vapor Laser Isotope Separation (AVLIS) which is the technique used in the Brazilian facility for isotope separation via laser. In this work we are going to show the latest results on the Brazilian AVLIS applied to enrich dysprosium. As a preliminary result, it was observed an enrichment by means of a mass spectrometer coupled to the experimental setup and a thin film was collected with an enrichment factor of 1.37 (163Dy).
Design of Gas Diffusion Cascade for Production of Carbon Isotope Using Ethylene as Processing Gas
Authors: Li Jun-Jie , Pan Jian-Xiong , Zhou Ming-Sheng , Pei Gen 
Published: January 2022

Abstract
Carbon-13 isotope has a wide range of applications in medical diagnosis, scientific research, food safety and other fields, and the market demand for carbon-13 isotope is also showing an upward trend. In order to explore the separation and production methods of carbon-13 isotope, the gas diffusion separation experiment with ethylene as the processing gas was carried out, and the cascade was designed on this basis. Through the single-stage separation experiment, it can be obtained that the overall separation factor of the gas diffusion method for separating ethylene under the existing experimental conditions is 1.014. The gas diffusion cascade enrichment of carbon-13 isotope involves two steps. The first step is to separate ethylene using a squared-off cascade to obtain the heavy fraction with the carbon-13 isotope abundance reaching 49%. The second step is to convert ethylene into carbon dioxide, and then use a squared-off cascade to separate the carbon dioxide to obtain the heavy fraction with the carbon-13 isotope abundance reaching 95%.
Study on Construction Technology of Bridge Structure Based on Oblique Photography
Authors: Xu N , Zhang X , Zhao JL 
Published: January 2022

Abstract
Based on the new technology of oblique photography, a real scene model of the building site is established. Construction simulation and traffic diversion design of bridge structure under the real scene model are studied. It is shown that the three-dimensional real scene model can reflect the environment of the bridge structure truly, and it provides a reasonable plan for the position of construction machinery and the organization of bridge demolition and construction, and it also provides a foundation for the efficient and orderly construction of the bridge structure.
The Bilevel Linear Programming with Fuzzy Relation Constraints
Authors: Xia DC 
Published: January 2022

Abstract
Aiming at the particularity of bilevel linear programming model with fuzzy relationship constraints, a new algorithm is designed based on bilevel linear programming. Firstly, a bilevel linear programming problem model with fuzzy relation constraints is established, and the related definitions are given; Then, the solution process of the model is stated. Finally, an example is given to verify the correctness of the algorithm.
An Experimental Study of the Impact Damage of Reinforced Concrete Piers Protected by Closed-Cell Aluminum Foam
Authors: Zhang WC , Jia LJ , Zhou XW 
Published: January 2022

Abstract
In recent years, China’s ship transportation has shown a rapid growth trend, and the accidents of ships hitting bridge piers are becoming more and more frequent. In view of the frequent occurrence of ships hitting bridge piers, this paper selects closed-cell aluminum foam as the anti-collision material of the piers, and conducts cumulative horizontal impact tests on the closed-cell aluminum foam protected concrete piers. The aim of the experimental tests was to study the influence of the stress stage, thickness and density change of the closed-cel laluminum foam on the impact damage of the concrete piers. The test results show that under the cumulative impact, the close-cell aluminum foam at the yield plateau stage can reduce the damage of the pier; the suitable thickness and density of closed-cell aluminum foam can slow down the development of pier cracks and reduce the impact damage of concrete piers; the densification, excessive thickness and density of closed-cell aluminum foam will increase the impact damage of the bridge pier.
Experimental Study of Basic Mechanical Properties of Short Basalt Fiber Bundle Reinforced Concrete
Authors: Shao JG , Wang S , Liu Y , Zhang P , Tang GB , Jin YG , Li CC 
Published: January 2022

Abstract
In this paper, the mechanical properties of basalt short fiber bundle reinforced concrete (sbfbrc) are designed, and the effects of basalt fiber bundle content and diameter on its compression, splitting and bending properties are studied. The results show that basalt fiber bundle has good dispersion in concrete. The splitting tensile strength and flexural strength of high-strength concrete are significantly improved, but the compressive strength is not significantly improved. The compressive strength of concrete increases first and then decreases. When the fiber bundle content is 0.2%, the compressive strength increases by 6.11%. The splitting tensile strength and bending strength increase with the increase of fiber bundle content. When the fiber bundle content was 0.6%, they increased by 19.54% and 20.32% respectively compared with the reference group. Compared with basalt fiber bundle with diameter of 0.5mm and 0.8mm respectively, basalt fiber bundle with diameter of 0.2mm has better effect on improving the compressive, splitting, tensile and flexural properties of concrete
Effectiveness of In-Service Dampers over Long-Term Operation for Cable Vibration Suppression: A Study Based on Field Testing
Authors: Zhou P , Liu M , Kong WM , Xu YM , Li H 
Published: January 2022

Abstract
In order to explore the operation mechanism of dampers used on super long-span bridges, the characteristics of dampers in long-term operation are studied through field tests. Firstly, viscous damper and liquid leakage MR damper are selected to test the influence of fluid connecting rod on its damping force; Then, wireless and wired sensors are used to collect the acceleration response of cables with viscous dampers and MR dampers. Finally, the vibration characteristics of the cable are analyzed, and the control performance of the selected damper is evaluated. The results show that the high-order multi-modal vibration of the cable will occur in the range of 2-6hz whether the damper is installed or not. In addition, fluid leakage may reduce the additional modal damping ratio achieved by MR damper.
Shear Performance of Interface between Polyvinyl Alcohol Fiber Engineered Cementations Composite (PVA-ECC) and Concrete: Analysis and Parametric Study
Authors: Liu HB , Li Y , Liu XP , Wang XT , Zhang SL , Han Y , Jiang ZQ 
Published: January 2022

Abstract
In this paper, the shear properties of the interface between polyvinyl alcohol fiber cement-based composites (pva-ecc) and concrete with different roughness are studied. The test results show that: 1. Z-type interface can effectively improve the shear performance of pva-ecc and old concrete; 2. With the increase of roughness, the slip peak value increases, and the horizontal extension section under failure shear stress is also longer; 3. The shear strength of the four types of interfaces is directly proportional to their roughness, but lower than the shear strength of the concrete itself.
Corrosion Factors and Mechanisms of Buffer Layer and Aluminum Sheath Inside High-Voltage Cable
Authors: Wang Xiaofeng , Ma Tao , Ma Xiao , Li Yongfu , Gao Chao , Hu Songling 
Published: January 2022

Abstract
Frequent failures of the buffer layer in high-voltage cables have been reported in recent years, which causes great losses. White spots and ablation were found inside these fault cables. The mechanisms of such failure phenomenon are still unclear, which arouses great attention of researchers. On the basses of previous studies, the authors characterized the fault cable, and studied the influence of the voltage type, moisture distribution, pressure, the shape of aluminum sheet on the generation of white spots. The authors proved the complexation of the water blocking powder and aluminum ions by using EDS (Energy Dispersive Spectroscopy). This paper provides meaningful theoretical supports for the design of new longitudinal water blocking structures.
Influence of SO2 in the Medium to High Temperature Range of SO3 Removal by CaO
Authors: Zhao Jiarui , Wang Zihao , Liu Youlong , Meng Fanqi , Shan Sike , Huang Chen , Liu Zhong 
Published: January 2022

Abstract
Injecting sorbents can effectively decrease the SO3 pollution, but its removal efficiency is reduced by the absorption owning to the abundant SO2. Experiments were carried out on a fix bed reacter to study the effect of SO2 on the deSO3 by CaO in the medium to high temperature range. The increase in temperature may obviously improve the removal efficiency of SO3, but the conversion of SO2 to CaO is much higher than SO3, resulting the SO3 selectivity decreases. Decreasing the SO2 concentration or increasing the SO3 concentration may increase conversion by CaO and SO3 selectivity, but the former is less influential than the latter.
Study on the Highly Efficient Reduction of CO2 to Formate Using Zinc under Mild Hydrothermal Conditions
Authors: Zeng Xu , Yao Guodong , Zhao Jianfu 
Published: January 2022

Abstract
In this study, the reaction mechanism of CO2 reduction by using Zn under mild hydrothermal condition was investigated by DFT calculation method. Based on the calculation of the transition state, as well as the IRC and HOMO/LUMO, the Zn-H was considered as a key intermediate for the high formate production from CO2. This study provides information on the reaction pathway of metal reduction with the metal hydrogen bond under hydrothermal conditions. The energy diagram showed that the Zn-H has high reducing activity, which induced that the formate was easily produced through hydrothermal reactions. From the viewpoint of energy, in the CO2 reaction system, the HCOO- was easily produced than that in the HCO3
- reaction system. This process provides new concept for the high efficient production of value-added chemicals in the carbon dioxide utilization research area.
Study on Friction and Wear Behaviors of M42 High Speed Steel
Authors: Liu Yu , Li Dong , Shao Qingli , Ma Haikun , Kang Jie , Su Ru 
Published: January 2022

Abstract
Taking Chinese-made (C-M42) and Japanese-made (J-M42) high-speed steel as research objects, the friction and wear tests were carried out and the wear mechanism was analysed. The microstructure and hardness of the two steels were observed by means of scanning electron microscope and hardness tester. Results show that J-M42 steel possesses a better wear resistance than C-M42 steel. This is related to relatively higher hardness, smaller average carbide size and higher volume fraction of carbide. There exists groove, adhesive patch and oxide layer in the worn surface. It manifests that the wear mechanisms of the two samples are adhesive wear, abrasive wear and slight oxidation wear. The overall surface roughness after wear is similar between the two steels whereas the plastic deformation layer in the vertical section of J-M42 steel is shallower than that of C-M42 steel.
VerDAQ: a Versatile Data AcQuisition system for high energy physics experiments
Authors: Rojas R. , Kuleshov S.V. , Silva C. , Carvajal G. , Abusleme A. , Hakobyan H. , Arredondo V. , Gonzalez J. 
Published: January 2022

Abstract
The Versatile Data AcQuisition (VerDAQ) system is a modular and flexible data acquisition platform designed to be used in a wide range of high-energy physics experiments, from small desktop detectors to large experiments in accelerators.
The main characteristic of VerDAQ is its flexibility that stems from a modular design, separating the front-end electronics in a mezzanine board from the back-end electronics on a motherboard. The latter includes a programmable System-on-Chip (SoC) that provides preprocessing and communication capabilities.

The VerDAQ system is hardware and firmware reconfigurable, enabling its use in standalone instruments as well as integrated into extensive data acquisition systems.
In this paper, the system structure is described in detail, and a particular implementation of a laboratory prototype using the DRS4 chip is characterized and used to demonstrate standalone operation.
Biomaterials-assisted exosomes therapy in osteoarthritis
Authors: Chen Manyu , Wang Qiguang , Wang Yunbing , Fan Yujiang , Zhang Xingdong 
Published: January 2022

Abstract
Due to the avascular characteristic of articular cartilage, its self-repair capacity is limited. When cartilage is damaged or forms osteoarthritis (OA), clinical treatment is necessary. However, conventional treatments, including joint replacement, microfracture, cell and drug therapies, have certain limits. Lately, the exosomes derived from mesenchymal stem cells (MSCs-EXO), which consist of complex transcription factors, proteins and targeting ligand components, have shown great therapeutic potentials. With recent advancements in various biomaterials to extend MSCs-EXO’s retention time and control the release properties in vivo, biomaterials-assisted exosomes therapy has been soon becoming a practically powerful tool in treating OA. This review analyzes the effects of MSCs-EXO on OA inflammation, metabolism, ageing and apoptosis, and introduces the combinational systems of MSCs-EXO with biomaterials to enhance the repair, anti-inflammatory, and homeostasis regulation functions. Moreover, different types of natural or synthetic biomaterials and their applications with MSCs-EXO were also described and discussed. And finally, we presage the future perspective in the development of biomaterial-assisted exosome therapies, as well as the potential to incorporate with other treatments to enhance their therapeutic effects in OA.
Siberian taiga and tundra fire regimes from 2001–2020
Authors: Talucci Anna C , Loranty Michael M , Alexander Heather D 
Published: January 2022

Abstract
Circum-boreal and -tundra systems are crucial carbon pools that are experiencing amplified warming and are at risk of increasing wildfire activity. Changes in wildfire activity have broad implications for vegetation dynamics, underlying permafrost soils, and ultimately, carbon cycling. However, understanding wildfire effects on biophysical processes across eastern Siberian taiga and tundra remains challenging because of the lack of an easily accessible annual fire perimeter database and underestimation of area burned by MODIS satellite imagery. To better understand wildfire dynamics over the last 20 years in this region, we mapped area burned, generated a fire perimeter database, and characterized fire regimes across eight ecozones spanning 7.8 million km2 of eastern Siberian taiga and tundra from ∼61–72.5° N and 100° E–176° W using long-term satellite data from Landsat, processed via Google Earth Engine. We generated composite images for the annual growing season (May–September), which allowed mitigation of missing data from snow-cover, cloud-cover, and the Landsat 7 scan line error. We used annual composites to calculate the difference Normalized Burn Ratio (dNBR) for each year. The annual dNBR images were converted to binary burned or unburned imagery that was used to vectorize fire perimeters. We mapped 22 091 fires burning 152 million hectares (Mha) over 20 years. Although 2003 was the largest fire year on record, 2020 was an exceptional fire year for four of the northeastern ecozones resulting in substantial increases in fire activity above the Arctic Circle. Increases in fire extent, severity, and frequency with continued climate warming will impact vegetation and permafrost dynamics with increased likelihood of irreversible permafrost thaw that leads to increased carbon release and/or conversion of forest to shrublands.
Predictive simulation of spring development of Cydalima perspectalis Walker in the South of Russia
Authors: Korsakova S P , Plugatar Y V , Sharmagiy A K 
Published: January 2022

Abstract
The work presents the results of a study of the features of the seasonal development of a dangerous invasive insect the box tree moth, Cydalima perspectalis Walker, specialised on plants of the genus Buxus L. Models for forecasting the dates of the resumption of larvae activity in spring after the winter diapause, the first adult flights of the overwintered generation and the appearance of the first summer generation of larvae have been developed for the southern regions of Russia. The accuracy of the forecast of the larvae coming out of the winter diapause is 3-4 days, of the adult flights and the appearance of the first summer of larvae is 9-10 days. The developed models can be used as a tool to improve the control of this pest.
IoT-based agriculture monitoring platform architecture
Authors: Zorkin A , Ivanova N 
Published: January 2022

Abstract
The research is aimed at solving one of the most urgent tasks of our time: the development of reliable and scalable software for monitoring the climate of agricultural fields. The goal is to create an architecture of simple and universal systems for collecting and storing data from various measuring devices located on agricultural land. The methodological basis for the monitoring system is the “Internet of Things” (IoT) approach. The agro-industrial complex of the Tomsk region (Russia) was chosen as a model object. About a hundred measuring devices have been installed in agricultural fields, which provide continuous delivery of data series in real time. Our developed platform includes both the server part of the application that processes and stores these weather data, and a convenient user interface for visualizing data to agronomists. The results of the research can be used in designing the architecture of similar IoT-based monitoring systems.
Features of Betula spp. cultivation through in vitro culture
Authors: Sergeev R , Kleva O , Timakov A , Zontikov D , Khusainova A 
Published: January 2022

Abstract
Birch improves the resilience of forests by colonizing forest gaps and rapidly increasing soil functioning and biodiversity [1], the healing properties of birch bark and extracts of birch bark have long been known in folk medicine around the world [2], and some species of birch are traditionally used to treat various inflammatory diseases [3], therefore, there is a need for high-quality birch planting material using clonal micropropagation. As a result of the study, data were obtained reflecting the dependence of the morphological parameters of plants on the content of the vitamin component and the composition of the nutrient medium. The study used culture media MS, WPM and QL without hormones and culture media MS, WPM and QL without hormones and vitamins. The most intense growth of shoots and leaves of the two studied clones was observed on WPM medium. The MS culture medium was used as a control.
State regulation of investment in agriculture
Authors: Lysa Olena , Oleksenko Roman , Azhazha Maryna , Venger Olga , Sergiienko Tetiana 
Published: January 2022

Abstract
An important task of state regulation of investment in the agricultural sector of the economy is to attract investors who are able to increase the efficiency of the functioning of agricultural enterprises. The success of the functioning of this enterprise depends on how quickly an agricultural enterprise is able to adapt to changes in the external environment. This is achievable under the condition of the most optimal use of the enterprise’s resource potential. Small agricultural enterprises are usually deprived of the possibility of using highly productive innovative agricultural technologies in their activities due to their high cost. Farm enterprises are also experiencing difficulties with insurance and attracting bank loans. In the competition with large agricultural enterprises, small farms survive mainly thanks to state subsidies. Large agricultural holdings are more financially stable, their economic activities are more diversified compared to farms. At large agricultural enterprises, labor productivity is higher and the cost of production is lower. The main task of the state for ensuring food security is to facilitate the process of consolidation of agricultural enterprises. The liquidation of small farming enterprises is an objective process that results from free market competition. The consolidation of agricultural enterprises will allow more efficient use of agricultural land in agricultural production.
Changes in work heaviness and intensity at farms with robotics
Authors: Semin A N , Skvortsov E A , Skvortsova E G 
Published: January 2022

Abstract
The article discusses the problems of changing the essence of work of agricultural workers in the context of introduction of digital technologies. The research aims to study the changes in heaviness and intensity of work of agricultural workers as a result of introduction of digital technologies. As research methods, the workplace of a robotic milking operator was assessed in comparison with a machine milking operator. And 7 indicators belong to class 1 and 6 indicators to the second class of the working conditions, therefore, a general assessment of work heaviness corresponds to the class “Acceptable” (class 2). The assessment of work intensity revealed 7 indicators that belong to class 3.1 (stressful work of the first degree) and 3 indicators to class 3.2 (stressful work of the second degree). This allows making a conclusion that a general assessment of work intensity of a robotic milking operator corresponds to the class of stressful work of second degree. The use of robotic milking can be recommended to reduce the loads for livestock workers. At the same time, attention should be paid to reducing the work intensity of robotic milking operators.