bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Solution Temperature on the Microstructure and Properties of TB10 Titanium Alloy Bars
Authors: Luo Zheng , Tan Zhouming , Wei Yanguang , Cui Xuefei , Tao Haiming
Published: November 2021

This paper studies the effect of solution temperature on the microstructure and mechanical properties of TB10 titanium alloy bars. The results show that the microstructure is composed of β phase and primary α phase (αp) when solution treatment is below the phase transition temperature. With the increase of the solution temperature, the β phase grain size in the microstructure increases, the thickness of the grain boundary decreases, and the number and size of the αp phase decrease, so that the strength of the alloy decreases and the plasticity increases. When the solution treatment temperature is 800°C, the reticulated grain boundary αp phase causes the plasticity to drop rapidly. When the solution treatment temperature is above the phase transition point, as the solution temperature rises, the β phase re-nucleates and grows, the grain size increases, the number of αp phase decreases. The super-cooled β phase grains induce martensite phenomenon due to stress, which eventually causes the strength and plasticity to decrease.
Coupling mechanism of materials and screen surface motion in multi-stage variable inclination equal thickness screening process
Authors: Huang Long , Zhao Yuemin , Zhang Yadong , Pan Miao , Jiang Haishen , Dong Liang
Published: November 2021

Multi-stage variable inclination equal-thickness screen (MSVIETS) is widely used in separating coal and mineral particles because of its large production capacity and good screening performance. In this study, the kinematic characteristics of infeed and outfeed ends surface under the conditions of load and no load was investigated by using a high-speed camera analysis system. The motion speed of the screen surface at the infeed end was approximately 5 times higher under load than under no-load conditions, and motion speed of the screen surface at the outfeed end was approximately 4 times higher than under no-load conditions. The mechanism of coupled motion of material and screen surface in the process of multi-stage variable inclination equal thickness screening was elucidated, and the energy coupling transfer law was “strong in and weak out”.
An improved new transformer type arc suppression reactor
Authors: Liu Meijie , Ji Degui , Meng Zhen
Published: November 2021

In this paper, to accurately compensate the arc suppression coil, the structure of the transformer is improved. Here, a fixed inductive element is connected in series with the short-circuit winding, which combines with the leakage inductance of the original transformer to form a new short circuit impedance. The improved transformer reduces the manufacturing cost and difficulty of the controllable inductor, reduces the requirements for the winding of the reactor, and makes the manufacturing easier.
Performance analysis and material selection of stainless steel expansion joints for power grid equipment
Authors: Zeng Yanggen , Hu Yujing , Wang Zhensheng , Xie Yi , Liu Weike
Published: November 2021

Stainless steel expansion joint, as the connecting part of GIS equipment, has the function of compensating the deformation of GIS caused by cold and hot stress. And it should at least meet the requirements of anti-corrosion and non-magnetic according to the working environment. This work investigate the performance of 304, 316L and 825 austenitic stainless steel expansion joints by metallographic analysis, hardness test, XRD analysis and magnetic analysis, and suggestions on material selection of expansion joint for power grid equipment are put forward.
Research on calibration method of uniformity of radiation interference field of intense electromagnetic pulse
Authors: Fu Chunliang , Gong Linhua , Lin Jiangjing , Zhou Jun
Published: November 2021

With the rapid development of electronic and electrical products, the working frequency of ite products is higher and higher, the influence frequency range of interference between electronic products is also expanding, the test frequency range of radiation anti-interference is improving, at the same time, more and more attention is paid to the requirements of radiation anti-interference test site. At present, the uniformity of radiation field is mainly realized by single point multiple test, which will inevitably lead to the measurement error due to the time-varying characteristics of the radiation signal itself; In addition, the test time is greatly increased and the test efficiency is low. In order to solve these problems, this paper designs a device which can realize multi-point test at one time and can automatically adjust the test area. The simulation shows that the device can meet the requirement of 9point uniformity test of radiation field in 500mm × 500mm ~ 1500mm × 1500mm area. On this basis, experiments are carried out in 1000mm × 1000mm test area for 1.35GHz and 2.88GHz. The experiments show that the test device can meet the requirement of 9point uniformity test and greatly improve the test efficiency and automation.
Design of AGV Control Strategy in a Processing System
Authors: Zhou Ling , Zhang Shengjie , Cai Ningyuan
Published: November 2021

A typical manufacturing system requiring a high degree of automation usually includes warehouse, AGV, CNC, assembly line and laser marking equipment. Among them, AGV plays an important role on the overall operating quality and operating efficiency. This paper studies AGV control strategy under the background of the typical manufacturing system. Firstly the two modes of AGV motion path are defined; the flow chart of AGV movement between any two points in the system is analyzed, and the AGV communication module in the minimum operation mode is designed; finally, control programs for several main scenarios are proposed based on PLC ladder diagram. The outcome helps the optimization of AGV control decision relating to a bottom operation layer of any manufacturing system.
Battery life prediction method based on DE-GWO-LSTM
Authors: Shi Yongsheng , Ren Jiarui , Shi Mengzhuo , Li Jin , Zhang Kai
Published: November 2021

Aiming at the problem of inaccurate prediction results of lithium-ion battery life, a lithium-ion battery life prediction model based on hybrid algorithm is designed. The position of grey wolf algorithm is updated by differential evolution algorithm, which improves the population diversity and avoids premature stagnation of the algorithm. The GWO-LSTM model and DE-GWO-LSTM model are compared and analyzed by using NASA data. The proposed DE-GWO-LSTM can well conduct global search and local search, and improve the prediction performance to a certain extent.
The synthesis of ReS2 flakes and its application in photodetectors
Authors: Xie YueLin , Chen Tingxuan , Chen Jian , Zhu Ling
Published: November 2021

ReS2 is attracting much attention because of its stable trion state. This kind of stable trion state arises on account of weak interlayer coupling as well as anisotropic crystal structure. In this research, we have synthesized ReS2 flakes successfully by using chemical vapor deposition (CVD) method. Stable ionic states in hexagonal wafers are observed by photoluminescence spectroscopy (PL). This substance is stable at room temperature. The HRTEM image from the single ReS2 hexagon reveals that the individual hexagon is single crystal. EDS spectroscopy indicates the purity of the synthesized product. We find that the Re and S atoms ratio in pure ReS2 is 1:2. Then we fabricate a photo detector on individual ReS2 flakes and test its performance. We compare the photocurrent in dark current and under a 500 nm incident light for two media (air and 100 ppm H2). Emission current increases from 1.15 μA to 1.67 μA (forward) and from 7.9 μA to 13.8 μA (reverse). Therefore, the ReS2 hexagonal wafer is an ideal choice for stable and reliable room temperature optical gas sensor. And the material can also be used for fast switch.
Research progress of silicon nanostructures prepared by electrochemical etching based on galvanic cells
Authors: Yang Xiaoyu , Tong Ling , Wu Lin , Zhang Baoguo , Liao Zhiyuan , Chen Ao , Zhou Yilai , Liu Ying , Hu Ya
Published: November 2021

Metal-assisted etching of silicon in HF aqueous solution has attracted widespread attention due to its potential applications in electronics, photonics, renewable energy, and biotechnology. In this paper, the basic process and mechanism of metal assisted electrochemical etching of silicon in vapor or liquid atmosphere based on galvanic cells are reviewed. This paper focuses on the use of gas-phase oxidants O2 and H2O2 instead of liquid phase oxidants Fe(NO3)3 and H2O2 to catalyze the etching of silicon in the vapor atmosphere of HF aqueous solution. The mechanism of substrate enhanced metal-assisted chemical etching for the preparation of large-area silicon micro nanostructure arrays is summarized, and the impact of substrate type and surface area on reactive etching is discussed.
Research progress of Pt-based electrocatalysts for the cathode of proton exchange membrane fuel cells
Authors: Wu Jing , Wang Haibin , Cong Yuanyuan
Published: November 2021

Research on advanced platinum (Pt)-based electrocatalysts has an important impact on proton exchange membrane fuel cells. This review introduces the current research progress of Pt-based electrocatalysts for oxygen reduction reaction (ORR) and puts forward the problems that need to be solved in future development.
Preparation and properties of ice cream flowers Ce/TiO2 photocatalyst
Authors: Fang Qi , Ou Xiaoxia , Yang Xiaoyu , Zhao Ke , Zhang Fengjie , Liang Chunyang
Published: November 2021

TiO2 composite photocatalysts with doping amounts of Ce (0.5%Ce/TiO2, 1%Ce/TiO2, 2%Ce/TiO2, 3%Ce/TiO2 and 5%Ce/TiO2)were synthesized via a sol-gel method.The structure and morphology of the prepared composites were characterized by XRD, SEM, DRS, XPS. At the same time, the photocatalytic effect of the composite on rhodamine B (RhB) solution under simulated visible light irradiation was explored.The results indicated that the crystal of powder catalyst was anatase type TiO2, and the directional aggregation of Ce/TiO2 composite photocatalyst showed ice cream flowers-shaped structure.The photocatalysis activity was the best when Ce doping amounts were 3%.The degradation rate of RhB was 96% in 120 min, which was 50% higher than pure TiO2.Hydroxyl radical (⋅OH) played a leading role in the whole photodegradation reaction system, and its contribution rate was about 66.4%.
The process for preparing MX2 (M=Mo,W; X=Se,S) single crystal
Authors: Zhang Xiaoli , Zhang Xiaoyi , Yang Yu
Published: November 2021

The layered semiconductor compound, as transition metal dichalcogenide family MX2 (M=Mo, W, X=S, Se) had stirred common interesting in solar energy conversion for its special photoelectronic properties. The synthesizing of its single crystal free of surface defects is a pressing matter of the moment. In this paper, the key points in preparing such single crystal are concluded, that is high vacuum, long time, and small ΔT, sometimes the transport agents have to be used to help the matter diffusion. And the proper quantities of these parameters are detailed in this paper too.
Simulation of crystal plasticity of P92 heat resistant steel considering martensitic lath structure
Authors: Wang Xinyu , Shen Junjie , Guo Xiangru , Qiao Jixin
Published: November 2021

Based on the theory of crystal plasticity, coupled with dislocation and lath hardening models, this paper establishes a crystal plasticity finite element model describing the high temperature creep of P92 steel. Open source software was used to generate lath models with an average size of 350nm, 650nm and 950nm to explore the effect of lath coarsening on the high-temperature creep behavior of P92 steel. The results show that the roughening of the slats increases the rate of creep deformation, resulting in a decrease in the service life of the material. Observing the slat model, it can be seen that the roughening of the slats enlarges the numerical gradient of stress and strain, and aggravates the overall plastic strain of the model. The coarsening of the slats accelerates the movement of dislocations, causing the density of movable dislocations to increase, and at the same time the shear strain amplitude of the slip system increases, thereby reducing the hardening behavior of the material.
The preparation of Li7La3Zn2O12(LLZO) battery ceramic and its conductivity
Authors: Zhang Xiaoli , Zhang Xiaoyi , Yang Yu , Duan Jiawei , Mi Liwei
Published: November 2021

For Li7La3Zr2O12 (LLZO) solid electrolytes, higher density usually means higher ionic conductivity. Researchers tried many preparation methods to get high density samples and at same times to realize industrial production, low cost, scalable and fast synthesis techniques. In this paper, the mainstream preparation methods of LLZO was given, as polymerized complex method, sol-gel method, field assisted sintering, combustion technique, auto-consolidation method, water-based solvent method. Among these methods, the last four methods can always increase the density to more than 93%. Especially the field assisted sintering method can make the relative density to be high as 99.8%. And all of these methods can make the ion conductivity to be higher than 1.4 × 10-4 S cm-1. Also, most of these methods introduced the Al element into LLZO to realize the liquid sintering.
Determination of 9 kinds of volatile halogenated alkane and chlorobenzene compounds in water by gas chromatography-mass spectrometry with purge and trap method
Authors: Liu Yanqin
Published: November 2021

In this study, in the face of water environmental pollution, a more simple and efficient detection method was obtained for simultaneous determination of 9 kinds of volatile halogenated alkane and chlorobenzene compounds in water by PT/GCMS. By optimizing the purge and trap conditions, the optimal experimental conditions were obtained as follows: purge time was 15 min, purge temperature was 35 °C, purge velocity was 40 mL/min, desorption time was 2 min, desorption temperature was 240 °C. The linearity of the method was good, and the correlation coefficients were all greater than 0.999. The minimum detection limit(MDL) of the method was 0.1 μg/L. The average recovery rate ranged from 85.4 %~102.1 % in surface water and drinking water with relative standard deviation (RSD) ranged from 5.3 %-9.2 % in the spiked concentration levels of 5 μg/L and 10 μg/L. This method has the advantages of simple operation, good separation effect, rapid detection, high recovery and good precision, and can simultaneously meet the requirements of 9 kinds of volatile organic compounds detection in drinking water and surface water. This work provides a new method for the detection of volatile organic compounds in water and will have great significance for the detection of water quality.
The Properties and Application Progress of Sorona Fiber
Authors: Zhou Wei , Zhou Peng , Tang Ying , Zhou Zhaoyi
Published: November 2021

Sorona fiber was produced from renewable resources with excellent performance of ordinary synthetic. In this paper, throughout the production process and internal molecular structure of Sorona fiber, the author introduced its environmental protection, tensile elasticity, easy dyeing and other properties and the current application.
C(sp3)-H alkenylation promoted by uranyl cation as a visible-light photocatalyst
Authors: Feng Zhiyu
Published: November 2021

The alkenylation of cyclic ethers with β-nitroalkenes using uranyl cation as a photocatalyst is reported. Previous studies revealed the feasibility of incorporating organic photocatalyst in the visible light mediated alkenylation, while the uranyl cation serves as an alternative photocatalyst candidate successfully accomplish this transformation through a different pathway. The reaction features the direct hydrogen atom transfer (HAT) process to activate alpha C(sp3)-H of cyclic ether, and consequently cyclic ether is coupled with β-nitroalkene to give the target product with F-selectivity through C-C bond formation.
Effect of pulse frequency on laser welding on SiCp/6061 aluminum alloys with powder
Authors: Jian Yongchao , Shi Yan
Published: November 2021

Because of the uneven distribution of reinforcement particles in the molten pool during laser welding of SiCp/6061Al composites with powder, the effect of pulse frequency on the homogenization was studied in this paper. The pulse frequency of welding is changed and the macro morphology of the weld is studied by metallographic microscope. The particle uniformity of reinforcing phase and the porosity of molten pool at different frequencies were compared. The tensile strength of welded joints at different frequencies was tested by universal tensile machine. Finally, when the pulse frequency is 160Hz, the particle distribution of reinforcing phase is the most uniform and the tensile strength is the largest. The tensile strength reaches 267.06MPa, reaching 69.1% of the base metal. When the pulse frequency is 320Hz, the porosity of the weld is the lowest, reaching 1.75%.
Performance of multi-antenna wireless systems based on time reversal
Authors: Shen Aiguo , Yang Guangsong , Wei Dezhi
Published: November 2021

5G wireless mobile communication system is faced with massive equipment access, information security and effective transmission is worth paying attention to. Wireless physical layer security mainly uses encryption principle to enhance the security of information transmission, while time reversal technology combines its electromagnetic characteristics and physical channel characteristics to improve the security performance of wireless communication system. In this paper, a signal transmission model of wireless multi-antenna communication system based on time reversal cavity is proposed and white Gaussian noise is introduced. The simulation results show that the space-time focusing characteristics of time reversal cavity can make the signal energy more concentrated on the target user, which can not only effectively alleviate the communication quality problems caused by multipath effect, but also ensure the security of information transmission process.
RETRACTED: Quality Inspection of Digital Archives of Application and Installation in Power Business Expanding based on Artificial Intelligence Technology
Authors: Liang Haihong , Zeng Ling , Shen Xiaozhou , Shi Weiwei , Cang Jiujiao
Published: November 2021

The existing quality detection methods of business expansion digital archives have the problem of fuzzy evaluation standard, which leads to low classification accuracy. This paper designs a quality detection method of business expansion Digital Archives based on artificial intelligence technology. The business characteristics of business development are extracted, the minimum business data unit is described, the digital archive catalogue database is established, the digital archive evaluation standard is defined, the text similarity is calculated, the user model is established, and the quality inspection mode is established by using artificial intelligence technology. Experimental results: the average classification accuracy of the designed method based on artificial intelligence technology and the other two quality detection methods is 55.763, 43.560 and 42.605, which proves that the quality detection method based on artificial intelligence technology has higher use value.
Smart Bluetooth beacon based on LoRa Positioning method and system research
Authors: Su Rui , Dai Yawen
Published: November 2021

In the era of the Internet of Everything, applications based on real-time location continue to appear in various industries. The indoor and outdoor positioning, analysis and management of personnel and objects can effectively improve the efficiency of production and management, which is of great significance to many industries. The use of Bluetooth beacon positioning has the advantages of low energy consumption, low cost, and fast data transmission speed. However, in real life, there are two obstacles to receiving signals, which are easily affected by the environment and the need for frequent on-site maintenance. This paper designs and implements a new type of LoRa-based smart Bluetooth beacon, which can be quickly connected to LoRa. Online monitoring and remote control can achieve better adaptation to the environment, and can fit a better signal attenuation model in the deployment environment in real time. Traditional signal strength positioning solutions have their own limitations. In order to improve the positioning accuracy of the Bluetooth beacon and the universality of the algorithm, in view of the low deployment density of beacons, the positioning accuracy is not good and the anchor circle has various situations, an optimized weighted centroid positioning scheme integrating greedy strategy is proposed.
Deep Reinforcement Learning for Channel Selection and Power Allocation in D2D Communications
Authors: Zhou Jun
Published: November 2021

Device-to-device (D2D) communication is regarded as a key technical component of the fifth-generation (5G), D2D communication usually reuses spectrum resources with cellular users (CUs). To mitigate interference to cellular links and improve spectrum efficiency, this paper investigates a sum-rate maximization problem in the underlay of D2D communication. Particularly, a joint channel selection and power allocation framework based on multi-agent deep reinforcement learning is proposed, named Double Deep Q-Network (DDQN). It can adeptly select the channel and allocate power in a dynamic environment. The proposed scheme only requires local information and some outdated nonlocal information, which reduces signaling overheads significantly. Simulation results show that the proposed scheme can improve the D2D sum rate and ensure quality-of-service (QoS) of CUs compared with other benchmarks.
Multi-mode Network Analysis under Differential Privacy
Authors: Song Yuning , Ding Liping , Dong Mengying , Liu Xuehua , Wang Xiao
Published: November 2021

With the advent of the big data era and the advancement of social network analysis, the public is increasingly concerned about the privacy protection in today’s complex social networks. For the past few years, the rapid development of differential privacy (DP) technology, as a method with a reliable theoretical basis, can effectively solve the key problem of how to “disassociate” personal information in social networks. This paper focuses on the multi-mode heterogeneous network model which has attracted a lot of attention in the field of network research. It introduces differential privacy and its application in big social networks briefly first, and then proposes a centrality-analysis method based on DP in a typical social network, i.e. the multi-mode network. The calculation principle and applicable scenarios are discussed. Then, its utility is analyzed and evaluated through experimental simulation. Possible improvement of DP algorithm in multi-mode networks above is prospected in the end.
Application of Improved Sparrow Search Algorithm in Concrete
Authors: Ouyang Chengtian , Tang Feng , Zhu Donglin , Qiu Yaxian , Liu Yujia
Published: November 2021

Compared with other algorithms, the performance of sparrow algorithm is better, but it also has shortcomings such as insufficient convergence and large randomness. For this reason, this paper proposes an improved sparrow search algorithm, which uses K-means to initialize the population to reduce the influence of randomness. Use sine and cosine search to improve the quality of the position of followers, and finally use adaptive local search to update the optimal solution, and apply it to concrete strength prediction. The results show that various improved sparrow search algorithms have certain advantages and high stability.
Research on VANET vehicle movement modeling in ITS
Authors: Wei Yun , He Zhaohui
Published: November 2021

At present, Traffic simulation has become the most widely used tool in operational research and system analysis. This paper studies VANET’s vehicle movement modeling theory in the Intelligent Transportation System. It build Car movement model by OPNET Modeler soft. It simulates VANET communication process, evaluates the entire performance of the network, which can offer reference to designing and optimizing the Vehicle Ad hoc Network.
An Algorithm for Automatically Extracting Dental Arch curve
Authors: Zhu Shengshan , Fang He , Zhang Dawei
Published: November 2021

Dental cone beam CT (CBCT) scans, due to their low radiation dose, are now widely used in the medical diagnosis of patients’ oral cavity. The reconstruction of a panoramic view of the dental arch from the scanned CBCT data facilitates the dentist’s observation of the patient’s oral condition. The most important technique for reconstructing the dental arch panorama is the extraction of the dental arch curve accurately. The existing method is to rely on the experience of the dentist to manually connect the dental arch curve, or use techniques related to threshold segmentation to extract dental arch curve. These methods rely on the experience of dentists on the one hand. On the other hand, when there are interferences such as implants, metal tubes, braces or missing teeth in the patient’s mouth, the threshold calculation will be wrong. Based on this, this article starts with the histogram of CBCT data, and proposes a highly robust and fully automatic dental arch curve extraction method. In the actual experiment, the dental arch curves of 40 different patients were extracted, and all the dental arch curves can be accurately and automatically extracted, thus verifying the effectiveness of the proposed algorithm.
LinGAN: an Advanced Model for Code Generating based on Linformer
Authors: Dai Hongming
Published: November 2021

Parsing natural language to corresponding programming language attracts much attention in recent years. Natural Language to SQL(NL2SQL) widely appears in numerous practical Internet applications. Previous solution was to convert the input as a heterogeneous graph which failed to learn good word representation in question utterance. In this paper, we propose a Relation-Aware framework named LinGAN, which has powerful semantic parsing abilities and can jointly encode the question utterance and syntax information of the object language. We also propose the pre-norm residual shrinkage unit to solve the problem of deep degradation of Linformer. Experiments show that LinGAN achieves excellent performance on multiple code generation tasks.
A new data classification improvement approach based on kernel clustering
Authors: Guo Bingsen
Published: November 2021

Data classification is one of the most critical issues in data mining with a large number of real-life applications. In many practical classification issues, there are various forms of anomalies in the real dataset. For example, the training set contains outliers, often enough to confuse the classifier and reduce its ability to learn from the data. In this paper, we propose a new data classification improvement approach based on kernel clustering. The proposed method can improve the classification performance by optimizing the training set. We first use the existing kernel clustering method to cluster the training set and optimize it based on the similarity between the training samples in each class and the corresponding class center. Then, the optimized reliable training set is trained to the standard classifier in the kernel space to classify each query sample. Extensive performance analysis shows that the proposed method achieves high performance, thus improving the classifier’s effectiveness.
Direction reconstruction using a CNN for GeV-scale neutrinos in IceCube
Authors: Yu S.
Published: November 2021

The IceCube Neutrino Observatory is designed to observe neutrinos interacting deep within the South Pole ice sheet. It consists of 5160 digital optical modules, which are arrayed over a cubic kilometer from 1450 m to 2450 m depth. At the lower center of the array is the DeepCore subdetector. It has a denser configuration which lowers the observable energy threshold to about 10 GeV and creates the opportunity to study neutrino oscillations with low energy atmospheric neutrinos. A precise reconstruction of neutrino direction is critical in the measurements of oscillation parameters. In this contribution, I will discuss a method to reconstruct the zenith angle of 10-GeV scale events in IceCube using a convolutional neural network and compare the result to that of the current likelihood-based reconstruction algorithm.
A functional extracellular matrix biomaterial enriched with VEGFA and bFGF as vehicle of human umbilical cord mesenchymal stem cells in skin wound healing
Authors: Xu Zhongjuan , Cao Junjun , Zhao Zhe , Qiao Yong , Liu Xingzhi , Zhong Junjie , Wang Bin , Suo Guangli
Published: November 2021

The construction of microvascular network is one of the greatest challenges for tissue engineering and cell therapy. Endothelial cells are essential for the construction of network of blood vessels. However, their application meets challenges in clinic due to the limited resource of autologous endothelium. Mesenchymal stem cells can effectively promote the angiogenesis in ischemic tissues for their abilities of endothelial differentiation and paracrine, and abundant sources. Extracellular matrix (ECM) has been widely used as an ideal biomaterial to mimic cellular microenvironment for tissue engineering due to its merits of neutrality, good biocompatibility, degradability, and controllability. In this study, a functional cell derived ECM biomaterial enriched with VEGFA and bFGF by expressing the collagen-binding domain fused factor genes in host cells was prepared. This material could induce endothelial differentiation of human umbilical cord mesenchymal stem cells (hUCMSCs) and promote angiogenesis, which may improve the healing effect of skin injury. Our research not only provides a functional ECM material to inducing angiogenesis by inducing endothelial differentiation of hUCMSCs, but also shed light on the ubiquitous approaches to endow ECM materials different functions by enriching different factors. This study will benefit tissue engineering and regenerative medicine researches.
Disentangling the roles of land-use-related drivers on vegetation greenness across China
Authors: Tang LinLing , Chen Xiaoling , Cai Xiaobin , Li Jian
Published: November 2021

Quantifying the drivers of terrestrial vegetation dynamics is critical for monitoring ecosystem carbon sequestration and bioenergy production. Large scale vegetation dynamics can be observed using the leaf area index (LAI) derived from satellite data as a measure of ‘greenness’. Previous studies have quantified the effects of climate change and carbon dioxide (CO2) fertilization on vegetation greenness. In contrast, the specific roles of land-use-related drivers (LURDs) on vegetation greenness have not been characterized. Here, we combined the Interior-Point Method-optimized ecosystem model and the Bayesian model averaging statistical method to disentangle the roles of LURDs on vegetation greenness in China from 2000 to 2014. Results showed a significant increase in growing season LAI (greening) over 35% of the land area of China, whereas less than 6% of it exhibited a significantly decreasing trend (browning). The overall impact of LURDs on vegetation greenness over the whole country was comparatively low. However, the local effects of LURDs on the greenness trends of some specified areas were considerable due to afforestation and urbanization. Southern Coastal China had the greatest area fractions (35.82% of its corresponding area) of the LURDs effects on greening, following by Southwest China. It was because of these economic regions with great afforestation programs. Afforestation effects could explain 27% of the observed greening trends in the forest area. In contrast, the browning impact caused by urbanization was approximately three times of the greening effects of both climate change and CO2 fertilization on the urban area. And they made the urban area had a 50% decrease in LAI. The effects of residual LURDs only accounted for less than 8% of the corresponding observed greenness changes. Such divergent roles would be valuable for understanding changes in local ecosystem functions and services under global environmental changes.
An algebraic criterion of the Darboux integrability of differential-difference equations and systems
Authors: Habibullin I T , Kuznetsova M N
Published: November 2021

The article investigates systems of differential-difference equations of hyperbolic type, integrable in sense of Darboux. The concept of a complete set of independent characteristic integrals underlying Darboux integrability is discussed. A close connection is found between integrals and characteristic Lie–Rinehart algebras of the system. It is proved that a system of equations is Darboux integrable if and only if its characteristic algebras in both directions are finite-dimensional.
Variety testing of new head lettuce hybrids
Authors: Gish R A , Zvyagina A S
Published: November 2021

The growing demand of the country’s population for head lettuce is met, according to various authors’s estimates, by no more than 30-35%. The mains suppliers from Iran, Israel, and Uzbekistan are actively involved in the import of green crops in Russian Federation. One of the existing levers of increasing the production of head lettuce is the introduction of new high-yielding and complex-resistant hybrids into production and the development of varietal agricultural techniques for their cultivation. The article presents an agro-technology evaluation of new hybrids of head lettuce F1 Serena and F1 LE 10585 of the company “Sakata” according to the main economically valuable indications (productivity, yield, biochemical analysis) in the conditions of the Anapa-Taman zone.
Productivity, quality and efficiency of spring durum wheat cultivation when treating crops with a biological product
Authors: Sergeeva V A , Muravyov A A , Vlasova L M
Published: November 2021

The production experiments were carried out based on the farm “Yaroslav the Wise” of the Starooskol district of the Belgorod region. The article studies the effect of the biological product Biogor KM during the pre-sowing treatment of grain in combination with double spraying of growing plants of spring durum wheat Dar Chernozemya 2. One of the experiments provides for grain processing with the period of “germination-ripening” of its wheat plants reduced by 8 days. The second variant, in addition to processing the grain, had two sprayings carried out during the growing season. The second experiment lasted even less by 12 days in comparison with the control variant. The article establishes the positive influence of the biological product on the formation of the productivity structure of spring durum wheat plants. Grain processing in combination with spraying during the growing season led to the formation of the best productivity structure: plant height was 39% higher, the number of spikelets was 41.8% higher, the number of spikelets was higher by 35.3%, and the grain weight per spike was 39.2%. versus the control variant. The yield in the experiment was in direct proportion to the method of application of the biological product and the conditions of the growing season. The largest increase in yield - 0.40 t / ha or 14.5% was obtained in the variant with grain processing in combination with double spraying of plants during the growing season, the average yield for the studied period was 3.14 t / ha and was maximum, indicators of economic and bioenergy efficiency was also the best.
Automation and digitalization of healthy fruit and berry plants reproduction
Authors: Verzilin A V , Fedulova Yu A , Yu Pimkin M
Published: November 2021

High-quality planting material is a condition for increasing productivity and labor productivity in the cultivation of agricultural products. High-quality planting material is material that is free from harmful pathogens. The process of plant healing requires significant time and material costs. However, with the proper organization, plant healing can be significantly accelerated and cheapened. The main condition for accelerating this process is maximum automation and digitalization of all stages of clonal micropropagation. The article shows the results of many years of work on the cultivation of healthy planting material. Variants of possible improvement of planting stock recovery are proposed with the introduction of the necessary hardware and software at specific stages of recovery and reproduction.
The response of apple tree varieties to the anomalies in the water and temperature conditions in 2020
Authors: Grigoreva L V , Tsukanova D N , Tsukanova E M
Published: November 2021

The authors establish that the destabilization of the water and temperature conditions in farming areas is currently the most significant factor limiting the development of fruit plants. The results of the weather monitoring in 2020 show significant deviations of the water and temperature conditions in that year from the long-time annual averages, the most significant of which are abnormally dry February and March, cold and humid May, as well as the alternating hot and cold spells and dramatic temperature drops between days and nights. The monitoring of the physiological parameters of apple trees showed that the vegetation period of 2020 featured an early start of plant growth, the suppression of photosynthesis in midsummer due to high air temperatures, low precipitation, and the late beginning of winter lethargy for apple trees.
Dependence of productivity of white lupine seeds on the foliar dressing with macro- and micronutrient fertilizers
Authors: Blinnik A S , Naumkin V N , Naumkina L A , Yu Artemova O , Kryukov A N
Published: November 2021

The paper presents the results of the studies on the determination of the effect of foliar dressings with macro- and micronutrient fertilizers on linear growth, the mass of air-dry matter of plants, leaf surface, the formation of a symbiotic apparatus and the yield of seeds of white lupine (Lupinualbus L.) in the conditions of black soils of the Central Black Earth region of the Russian Federation. The field experiments were carried out in 2018-2020 at the Department of Crop production, Breeding and Horticulture of Belgorod State Agrarian University. The object of the research is a high-intensity variety of white Degas lupine. The subject of the research is microfertilizer Aquamix-TV, potassium sulfate fertilizer (K2SO4), phosphate-potassium monophosphate fertilizer (KH2PO4). The weather during the years of the experiments was hot and dry. During the critical periods of the development of lupine plants, a moisture deficit was observed with the excess of heat. The soil cover of the experimental site was represented by a typical medium-thick low-humus heavy loamy black soil with a granulometric composition. The accounting area of the plot was 18 m2, the replication was fourfold and the placement was systematic. The experiment included six variants: control (without fertilizers), foliar dressing with Aquamix-TV micronutrient fertilizer, foliar dressing with potassium sulfate solution, foliar dressing with potassium monophosphate solution, foliar dressing with Aquamix-TV + potassium sulfate mixture and foliar dressing with Aquamix-TV + monophosphate mixture potassium. The analysis of the obtained data showed that the highest yield of seeds of white lupine variety Dega was obtained on variants with foliar dressing with micronutrient fertilizer Aquamix-TV in combination with potassium sulfate and monopotassium phosphate, which amounted to 3.52 and 3.51 t / ha, respectively, which is 0.52 and 0.51 t / ha or 17.3 and 17.1% more than the control variant.
Research on the efficiency of soil melioration with modified organic fertilizer from pig manure
Authors: Gribut E A , Kulikova M A , Kolesnikova T A , Surzhko O A , Merzlaya G E
Published: November 2021

The most effective doses of the modified organic-mineral fertilizer (MOF), produced from non-contact pig manure in the conditions of the Rostov region for the purpose of soil reclamation, were determined. Experimental studies were carried out to determine the most effective dose of MOF based on non-contact pig manure. The dependence of the spring wheat yield on the use of a modified organic-mineral fertilizer based on liquid waste from pig farms fermented bird droppings and mineral fertilizers is determined. The equivalence of the effect of a modified organic-mineral fertilizer based on liquid waste from pig farms and fermented bird droppings, introduced in an equivalent dose, on plant biomass was established. When comparing the effects of different types of fertilizers, their toxicity was not established. The introduction of a modified organic-mineral fertilizer based on liquid waste from pig farms at a dose of 2 t / ha provided the highest biomass yield of 34-day-old plants of spring wheat of the “Zlata” variety, which reached 0.9 g/vessel and was 28.5% higher than the control value. A new organic mineral fertilizer with a pH of 8-10, with an organic content of up to 73% per dry weight, can be used for supporting the quality of liming and improving soil.
Fusarium diseases of sunflower and wheat in Tambov region
Authors: Vypritskaya A A , Kuznetsov A A , Chekmarev V V , Buchneva G N , Dubrovskaya N N , Korabelskaya O I , Gusev I V
Published: November 2021

The study of prevalence and species composition of Fusarium fungi on sunflower and winter wheat crops was carried out in Tambov region. In 1992-2020, 15 Fusarium fungi were identified on sunflower crops. It was identified that the predominant species infecting sunflower plants and seeds are Fusarium oxysporum, F. oxysporum var. orthoceras, F. verticillioides, and F. tricinctum. The prevalence of these pathogens was 16.3-21.8%. On the grain of winter wheat, Fusarium poae, F. equiseti and F. sporotrichioides were more common (19.6-28.6%). It was found that the seeds of Lgovskaya 8, Don Awnless and Don’s Governor were less affected by fusarium infection (by 3 - 4%). It was observed that Fusarium fungi are associated with certain winter wheat varieties. Research results may be useful for specialists studying diseases of sunflower and wheat.
Milk quality and its suitability for technological processing in cows with metritis
Authors: Ryhlov A S , Firsov G M , Loschinin S O , Filatova A V , Avdeenko V S , Krasnikov A V
Published: November 2021

It has been established that the development of metritis in cows after providing obstetric aid as a result of abortion, eversion of the uterus or retention of the placenta is accompanied by an increased microbial and fungal background of the uterus. Without obstetric aid during delivery, only from 5… 9 days after birth, 35.37% of cows had genitals contaminated with various pathogenic microflora. Already on the third day of puerperia, 14 species of bacteria were isolated from cows that were assisted in delivery, which in 74.5% of cases were contaminated with pathogenic microflora: S. aureus (in 15.5% of cases), E. coli (37%), K. pneumonia (12%), and S. pyogenes (10% of cases). The results of mycological studies revealed that A. fumigatus, C. albicans and C. crusei were isolated from cows after obstetrics. It was found out that the content of somatic cells (SC) r = 0.63, the activity of muramidase (AM) r = 0.84, lactoperoxidase (LPO) r = 0.65 and lactoferrin (LF) r = 0.66 change with a high degree of correlation. Milk from cows with metritis showed 2 times higher total bacterial contamination than milk from clinically healthy animals. Milk from sick cows has a reduced number of lactic acid organisms after the first day of storage. At the same time, acid formation occurred faster by 5.0–15.0% than that in control samples of milk prepared for production of lactic acid products. The acidity in milk fermented with Lactobacillus bulgarus was 12.0-13.3% higher than that in the control sourdough samples, and the cell viability of the symbiotic combination was an order of magnitude lower (2.5×106 versus 2.5×107) compared to the control samples of the lactic acid product.
Method of engineering calculation of recuperator parameters for heat extraction from tempered soybeans
Authors: Shuvalov A M , Mashkov A N , Chernov D S , Manaenkov K A , Khatuntsev VV
Published: November 2021

In the conditions of constant growth of prices for consumed energy and competition in the domestic market, rural commodity producers have a problem to reduce energy costs, since they make up a significant share in the cost of agricultural products. There are particularly high energy costs in the heat treatment of meat and dairy products and grain. To reduce energy costs for thermal purposes, you can use the secondary heat extraction and its use in a specific technological process. To calculate the parameters of a heat recuperator that reuses heat energy from heat-treated soybeans, an engineering calculation method is presented.
Water-soluble vitamins in honeys of various botanical origin and their change during storage of honey
Authors: Popkova M A , Budnikova N V , Paramzina I A
Published: November 2021

The richest chemical composition of honey determines its extremely high biological activity. The composition and concentration of bioactive compounds of honey largely depend on its botanical origin, i.e. they are determined by nectar and the pollen chemical composition of the nectariferous plant, on the soil on which they grow, as well as on climate and weather conditions. Along with enzymes and minerals, vitamins are found in honey in small but measurable amounts. Vitamins of honey are mainly represented by B-group vitamins. The content of vitamins in honey varies according to its botanical origin. The following types of honey were used for the study: acacia, sunflower, chestnut, linden, buckwheat. The quantitative determination of water-soluble B-group vitamins (thiamine, riboflavin, pyridoxine, pantothenic acid, nicotinic acid) in honey of various botanical origin was carried out in the accredited laboratory of the direction of chemical and biological research of beekeeping products of the Federal Research Center of Beekeeping by the method of capillary electrophoresis. It was revealed that chestnut and buckwheat honey present the highest levels of water-soluble vitamins content; that confirms the prospects of their use as a source of vitamins. Vitamins are unstable compounds that can be easily destroyed by various factors. Under the impact of daylight, the studied water-soluble vitamins contained in honey are destroyed during storage. The dynamics of changes in the vitamins content was traced during the storage of honey for 12 months in a dark place and in the light. Riboflavin andnicotinic acid, which is significantly reduced, is caracterized by a higher sensitivity to the action of daylight during storage of honey.
Processing of natural plant raw materials and their use as additives in the food industry
Authors: Nikonovich S N , Tarasenko N A , Kucherova S I
Published: November 2021

The article deals with the issues of deep processing of non-traditional plant raw materials – amaranth. The authors found that amaranth seeds of various types are a source of starch and protein, balanced in amino acid composition. A comparative assessment of the main nutrients and mineral composition of amaranth seeds with traditional crops showed that amaranth seeds are unique as raw materials for the production of biologically active additives. It is proved that a fine powder of whole-ground flour is possible to obtain by double mechanical processing of amaranth seeds with mandatory heat treatment before introduction into the recipe. It was experimentally revealed that the developed biologically active additive has a high nutritional value and functional properties, which are formed due to squalene content, essential amino acids and plant phospholipids.