bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimal Guidance Law for Intercepting the Active Defense Aircraft with Terminal Angle Constraint
Authors: Zhang Hao , Zhang Yiqun , Zhang Pengfei 
Published: March 2021

Abstract
For the scenario where the target can actively defend against the attacking missile, an optimal guidance law for the attacking missile that can simultaneously evade the defending missile and intercept the target is proposed. To increase lethality of the attacking missile, the terminal angle constraint is considered. Assuming that the defending missile and the target is using a known control strategy, the guidance law design problem for the attacking missile is formulated as an optimal control problem with inequality constraint. General solution of the problem is derived for arbitrary order dynamics of the adversaries. Then first-order dynamics of the three players are considered and an analytic solution is presented. Numerical simulations are carried out to demonstrate the high performance of the proposed guidance law.
Research on the Evaluation Index System of Trust, Innovation and M&A Value
Authors: Wang Yan , Zhao Deqiang 
Published: March 2021

Abstract
Due to the particular nature of ownership, the motivations for state-owned enterprises to participate in the mixed ownership M&A include not only the realization of corporate capital appreciation and value creation, but also some strategic factors at the national level, such as concentrating state-owned economic power to promote the development of the industry and maintaining stable social development. Based on the characteristics of the self-development of state-owned enterprises and the maximization of interests, this paper constructs the evaluation system of trust mechanism from five dimensions of shareholders’, creditors’, suppliers’, buyers’ and enterprises’ sincerity; constructs the evaluation system of innovation mechanism from three dimensions of technological innovation ability, market competitiveness and sustainable development ability; and the evaluation system of the mixed ownership M&A value of state-owned enterprises from four dimensions of Tobin’s Q, operating cash flow, return on total assets and corporate governance.
Functional Variants in Human ACE2 Can Decrease its Protein Stability and May Influence the Binding with SARS-CoV-2
Authors: Ge Fang , Muhammad Arif 
Published: March 2021

Abstract
As for the transmission of human to human, the recent pandemic of COVID-19 is now spreading among the population, which has already led to 1.86 million deaths. As recently reported, it is the SARS-CoV-2 that causes COVID-19. Furthermore, human ACE2 is the receptor of the coronavirus. Nowadays, it has been reported that missense variants in ACE2 may affect the coronavirus susceptibility. In this work, we explored the functional impacts of missense variants in human ACE2. Briefly, we initially collected the variant in human ACE2, which have been labeled as important sites of ACE2 or the critical binding sites with the spike protein. Thereafter, applying the technology of protein structure homology modeling, we constructed the molecular spatial structure models of the variants. Next, variants molecular models of ACE2 were superimposed over the wild type of ACE2, to observe the structural changes. As experimental results demonstrated, the overall structures of ACE2 variants are similar. However, several variants (i.e., G173S, V184A, I233F, D355N, R357A, R357S, and G575V) in ACE2 are predicted to decrease the stability of human ACE2 protein and/or to be harmful to human health. Accordingly, the final findings could also provide a functional and structural basis for the potential pathogenicity of ACE2-driven viral infections.
Analysis of Temperature, Stress and Displacement Distribution under Freeze-Thaw Considering the Influence of Initial Boundary and Insulation Layers
Authors: Zhang Xiaomei , Jiang Mingjun , Wang Shijun , Zhang Zhe 
Published: March 2021

Abstract
The freeze-thaw disaster in seasonally frozen soil area are challenging the operation safety of power transmission and transformation projects. The distribution of soil temperature and deformation laying below the foundation is significant to the soil stability in seasonally frozen soil area. The temperature distribution of the foundation is closely related to the external temperature, the thermal field of bottom boundary and the materials of insulation layers. In this paper, the typical tower foundation of 750 kV Gansu Hexi power grid project and the geological conditions of Shulehe area in Gansu Province were selected as the investigation site, and the theoretical analysis and numerical simulation methods are used to analyze the thermal-mechanical coupling considering different boundaries. The deformation, stresses and temperature changes of tower foundation and surrounding soil under different thermal protection structures were discussed. Through comparative analysis, it was found that the optimized structure can effectively improve the soil temperature in extreme environment, avoid frost heave, and meet the design requirements of bearing capacity.
Pollution Characteristics and Ecological Risk Assessment of Heavy Metal in the Coast Sediments along Power Plant-Sanshimu Village of Yangzong Lake, Yunnan Province
Authors: Li Yanli , Fan Fu , Li Jin , Ying Xi 
Published: March 2021

Abstract
To explore the current situation of heavy metal pollution in Yangzong Lake areas, the contents of Cu, Zn, Ni, Cr, Fe, Mn, V, Mo, Co, Sr, Li, Be, Cd, As, Pb, Al, Ba and Ti in 40 coast sediment samples along Power Plant-Sanshimu Village were determined. Single factor pollution index, enrichment coefficient and geoaccumulation index were used to evaluate the heavy metal pollution. The results showed that concentrations of Cu, Cr, Co and Be in all samples exceeded their natural background values. The average concentrations of Co, Cd, Cu, Be, Cr, Mo, V, As, Ni, Li, Zn, Mn, Sr and Fe were higher than their natural background values, while Pb, Al, Ba and Ti were opposite. Co, Cd, and Cu were the highest degree of pollution, followed by Be, Cr, Mo and V. Potential ecological risk index indicated a moderate-strong ecological risk. Cd, Co, As and Cu were the main ecological risk factors in this region.
Response of Grassland Slope Erosion to Vegetation Characteristics
Authors: Wang Dongdong , Yuan Zaijian , Jing Dawei , Zhao Chunyu 
Published: March 2021

Abstract
The grassland erosion research on steep slopes is the basis and difficulty, which was studied by artificial rainfall experiments. Results showed the following: (1) Decreasing the stream power (Rω) is main way to decrease the interrill erosion. (2) The regulation effect of grass on stream power and soil erodibility are mainly achieved by grass cover and root volume, separately. (3) The contribution rates of root volume (RV), and soil bulk density (SD) to RK is 73.61%-97.94, and 0.04%-0.22%.
A New Atmospheric Dataset for GIIRS Sampled from ERA5 Using Shannon Entropy Method
Authors: Zhang Qi , Yu Yi , Zhang Weimin 
Published: March 2021

Abstract
Geostationary Interferometric Infrared Sounder (GIIRS) on board the new Chinese geostationary meteorological satellite Fengyun-4A is aimed to obtain three-dimensional atmospheric information regularly at the regional scale. Since the existing atmospheric datasets are global covered and they are not representative of the GIIRS detection area, a diverse and local representative atmospheric dataset is required for GIIRS in training transmittance parameterization scheme of fast radiative transfer model and retrieving atmospheric profiles. The new atmospheric dataset for GIIRS application in this paper is sampled from the European Centre for Medium-Range Weather Forecasts (ECMWF) fifth-generation reanalysis (ERA5) 2019 dataset using Shannon entropy sampling method. The new dataset demonstrates the feature of uniform distribution within multiple atmospheric variables’ (i.e. atmospheric temperature, specific humidity, 2 meter temperature) variation ranges and GIIRS’s spatial coverage. To address the issue derived from the climate difference and the varied vertical pressure structure of regions with great differences in topographic height, the study area is divided into six categories regarding of topographic height categories where atmospheric dataset are sampled separately. Seasonal variation is also taken into account in the process of sampling. Compared with the initial randomly sampled dataset, the atmospheric and 2 meter temperature in the new dataset demonstrate a higher level of uniformity within their variation ranges. The statistical results indicate that the differences between samples in the new dataset are enlarged, meanwhile, the new dataset well retains the statistical characteristics of the original ERA5 dataset. The new dataset has a potential in the study of the utility of GIIRS data in the numerical weather forecast.
HVAC Measures of “Returning to the South” in Guangzhou
Authors: Nie Xian , Chen Wenjing 
Published: March 2021

Abstract
The phenomenon of “water-exit” often appears on the indoor surface in Guangzhou in spring, which is called “returning to the South” by the local people, which brings about health and safety risks. By analyzing the causes of “returning to the South”, this paper points out that the essence of preventing its harm to indoor environment is how to prevent indoor condensation in a high humidity outdoor environment and a low temperature indoor environment. During the design of operation and maintenance, the relevant measures to reduce the indoor air dew point temperature and improve the indoor surface temperature can be considered to reduce the disaster of returning to the south.
The Evaluation of Ecological Service Value of Liaohe River Estuary Wetland
Authors: Zhang Wanshu , Jiang Wei , Lin Yanyu , Mao Qianyi 
Published: March 2021

Abstract
Taking the wetland of the Liaohe River Estuary as the research object and combined with the emergy theory, aquatic product supply service, plant resource supply service, atmospheric oxygen content regulation service, atmospheric carbon dioxide content regulation service, water regulation service, biological habitat regulation service, scientific research culture service value, leisure and entertainment service value are chosen to evaluate the ecological service value of the Liaohe Estuary wetland in 2019. The results of the study show that the total emergy value of the wetland at the mouth of the Liaohe River is 59.931 billion yuan. Among them, the value of supply services is 2.057 billion yuan. The value of regulation services is 53.508 billion yuan, and the value of cultural services is 4.366 billion yuan. In the entire value of Liaohe estuary wetland, regulation service value>cultural entertainment value>supply service value. Among them, the ecological service value of Liaohe estuary wetland mainly comes from water resource regulation service value and biological habitat regulation service value. Therefore, the ecological service value Research is of great significance to the development and utilization of water resources.
Stability Analysis of Gravity Retaining Walls with Different Wall-back Types under Equal Section Area
Authors: Zhuang Jinliang , Chen Jianxu 
Published: March 2021

Abstract
Gravity retaining wall is divided into three types: vertical, upward inclined and bent inclined. There are few studies on the stability of different wall-back types of retaining walls. There is no clear regulation on the selection of retaining wall's back types, so it is difficult to measure the economy and rationality. Under the condition that the cross-section area is equal and other external conditions are the same, according to the Coulomb’s earth pressure theory, the anti-slip stability coefficient and anti-overlapping force stability coefficient of different back types of retaining walls are calculated respectively. Through analysis and comparison, the stability of vertical retaining wall is better than other types under the same conditions, which can be preferred.
Analysis on Seismic Damage Evolution of Seismic-Damaged CSC Columns with Strengthening
Authors: Peng Sheng , Xiong Zhou , Xu Chengxiang , Han Fei 
Published: March 2021

Abstract
To analysis the earthquake damage evolution law, seven composite steel concrete (CSC) columns were manufactured. The experiment consisted of pre-damage loading, reinforcement with enveloped steel jackets (ESJ)/CFRPs and pseudo-static tests. The results showed that the severely damaged specimens strengthened with CFRPs or ESJ have the ability to resist earthquake again. The experimental results were in good agreement with the analytical results. Based on the modification and extension of Reihorn evaluation criterion, the earthquake damage evaluation criterion of seismic-damaged CSC columns with strengthening was obtained, which describes the specimen from “basically intact” to “complete destroyed”. Then, the seismic damage evolution law of specimen was obtained by quantitative analysis of the test results.
The Progressive Partition Method to Identify Damage of Single-Layer Reticulated Shell
Authors: Fu Xiaomin , Ma Cuijuan , Zhang Huidi , Wang Hangyu , Ju Jinsan 
Published: March 2021

Abstract
For the damage location in the existing damage identification methods, this paper adopts the progressive partition method in view of the modal strain energy to locate and evaluate the bars’ damage degree in the K8 single-layer reticulated shell model. Through the correlation between damage identification index and damage degree, the location and damage degree of damage element can be precisely determined. Meanwhile, this method can effectively improve the anti-noise performance in the damage identification of structural, and determine the key elements for the overall stability of single-layer reticulated shells under specific loads. The research provides a basis for the diagnosis and reinforcement of damaged structure.
Study on Pretreatment of Phosphogypsum and Preparation of Non Burning Building Materials
Authors: Wang Haifeng , You Xiaoyu , Tian Jiayu , Cheng Xiaoliang , Wang Jiawei 
Published: March 2021

Abstract
Phosphogypsum has poor cementitious activity, which hinders its large consumption in the field of building materials. By studying the phase and microstructure of phosphogypsum pretreated by alkali activation, and the compressive strength, and microstructure of the non-sintering building materials prepared with the high content phosphogypsum, the process parameters of preparing high content and high compressive strength non-burning building materials with phosphogypsum were obtained. The result showed that, when 100 g phosphogypsum was added with 200 mL activator, after 24 hours of excitation under room temperature, the main crystalline phase CaSO4·2H2O of phosphogypsum have smaller grains and lower crystallinity. Microstructure analysis showed that the particles of tabular phosphogypsum were powdered, and the original plate-like crystal form became smaller plates. Thus, its gelation activity was improved. When the content of phosphogypsum was 80%, the compressive strength of non-burning building materials after maintenance for 7 days, 28 days and after immersion in water for 24h were 15.13 MPa, 16.4 MPa and 11.8 MPa, respectively. The micro morphology showed that the particle size gradient was appropriate and the density was very high, which was very beneficial to improve the strength of the material.
Power System Transient Current Sensor Based on Magnetoresistance Effect
Authors: Bi Lanxi , Wu Mengke , Xu Linbo , Sun Shihang , Yu Kun , Zeng Xiangjun 
Published: March 2021

Abstract
Aiming at the problem that the mixed use of overhead lines and cables causes serious refraction and attenuation of the traveling wave signal in propagation, which makes the traditional traveling wave sensor unable to adapt to the weak signal identification and recording requirements. A wideband sensor for detecting transient current signal of power system is developed. The detection principle of the anisotropic magnetoresistive sensor is analyzed, and the tiny signal precision differential amplifier circuit is designed. Based on the actual situation of the power system, a corresponding test environment was built to conduct transient current transfer tests. The experimental results show that the sensor has a high linearity in the 0-5MHz bandwidth, and is suitable for the extraction of various transient signals, especially in the power system traveling wave protection has high application value.
Study on the Growth Law of Manganese in Electrolysis Process of MnSO4 Solution Containing Magnesium
Authors: Tian Jiayu , Wang Haifeng , You Xiaoyu , Cheng Xiaoliang , Wang Jiawei 
Published: March 2021

Abstract
At present, there was no good industrial removal method for soluble impurity Mg2+ in electrolytic manganese industrial production, so MgSO4-MnSO4-(NH4)2 SO4 compound salt crystal with minimal solubility was formed by cyclic enrichment in solution. On the one hand, it caused the loss of manganese, ammonium and other main components, on the other hand, a large amount of storage caused environmental pollution. In order to find out the harmful effect of magnesium on the production of manganese in an all-round way, this paper studied the growth and deposition of manganese when the concentration of Mg2+ was 25g/L. The results showed that with the increase of electrolysis time, the grain size increases from 42.11μm for 2h to 185.71 μm for 10h, and the current efficiency gradually decreased from 73.3% for 2h to 67.26% for 10h. After 8 hours of electrolysis, the growth rate of grain size and the decrease rate of current efficiency were improved, and there were a certain relationship between them.
Factors of technological development of the Northern Sea Route
Authors: Guzov Iu , Polyakov N , Titov V , Vashchuk A 
Published: March 2021

Abstract
The article is devoted to the issues of technological development of the Northern sea route (NSR). The purpose of the study is to justify the need to create conditions for the technological development of the shipping line, which is a priority, large-scale and commercial project of Russia that provides economic growth of the Arctic regions and the Russian Federation itself. To make NSR the effective in near future, it is necessary to focus on the development of the Arctic icebreaker fleet, satellite communications, emergency rescue facilities, port fleet and digital technologies. As a result of research authors consider factors of technological development as elements of the driving force of the NSR project and an ecosystem of technological innovations that ensures the constant functioning of the shipping artery. The authors deem the following areas as key factors of the NSR’s technological development:
1. Formation of innovation-territorial clusters of enterprises focused on projects for the development of the Arctic Zone of the Russian Federation (AZRF).
2. Creation of special economic zones (SEZ) of technical and innovative type in the administrative centers of the Arctic regions.
3. Stimulating demand for innovative technologies.
4. Building a system of effective international cooperation.
5. Tax incentives for business in the Russian Arctic.
Main conclusions of the research. Technological innovations’ usage in development of the NSR will speed up the process of creating an effective and reliable engineering infrastructure, ensure the uninterrupted movement of ships, will give a powerful push and an extra boost to the sectors of Russian economy (shipbuilding, radio electronics, new materials, oil and gas equipment, etc.) and, as a result, it will create favorable conditions for public - private investment inflow in these industries and for the economy of Arctic regions.
Prospective principles of catalyst utilization using supercritical fluid media
Authors: Gumerov Farid , Bilalov Timur , Khairutdinov Vener , Zaripov Zufar , Gubaidullina Alfiya , EvgenyBelopukhov  , Terekhova Elena , Belskaya Olga , Chernenko Sergey 
Published: March 2021

Abstract
An overview of prospective principles of catalyst utilization using supercritical fluid media is presented. The processes in which these working media act as solvents and extractants, reagents and reaction media are considered. At the same time, we are talking about both heterogeneous catalysts and catalytic complexes dissolved in the water runoff of industrial enterprises. Using the LD-145 catalyst as an example, we studied the possibility of extending its service life instead of recycling, due to a change in the physical and chemical principles of its regeneration. We are talking about replacing the high-temperature process of vapor-air oxidation of catalyst-deactivating compounds with a supercritical fluid extraction process. At the same time, the extractant used is not widespread carbon dioxide, but propane/butane mixture, the use of which makes the process significantly more efficient. This is because a number of binary systems “deactivating compound – extractant” change the type of phase behavior from V-VI to I-II when changing carbon dioxide to propane/butane mixture. Thus, these systems, for example, involving naphthalene, phenol and some other substances in the supercritical fluid state fall outside the binodal of the binary system into the region of unlimited miscibility of components, which significantly increases the kinetics of the catalyst regeneration.
Liquid-phase systems with specified properties based on water-soluble derivatives of cobalt (II) phthalocyanine
Authors: Kovanova Mariia A. , Botnar Anna A. , Domareva Natalya P. , Futerman Natalya A. 
Published: March 2021

Abstract
In this work a wide range of sulfo derivatives of cobalt phthalocyaninewas used as an example for the creation of liquid-phase systems with specified parameters. The role of the spacer bridge in the peripheral position of the macrocycle on its aggregation and coordination properties is illustrated. It was found that associated forms (H-associates) of sulfonated metal phthalocyanines, in which the ionic peripheral group is removed from the macrocycle by oxynaphthyl-/oxyphenylazo-fragments (CoTSPc2 and CoTSPc3, respectively), have absorption in the region of 620-630 nm, while the Q-band of the monomeric form is located in the region 680-700 nm. It is shown that in the concentration range of 10−5 – 10−4 M the change in the optical density for CoTSPc1 and CoTSPc2is described by a linear law. Based on the position of the absorption maxima of the Q-band, phthalocyanines are in an aggregated form in the form of H-aggregates. The study of the coordination properties of macrocycles was carried out with the addition ofbidentate DABCO molecule. The stability of monoligand complexes with DABCO in aqueous solution changes in the order CoTSPc1 > CoTSPc3 > CoTSPc2.
Modeling information flows of the process of drilling wells and developing hydrocarbon deposits on the shelf
Authors: Sidorov Valery 
Published: March 2021

Abstract
The article discusses the issues of modeling business processes and information flows of the process of drilling wells and developing hydrocarbon deposits on the shelf. It is shown that the IDEF0 notation is the most convenient for describing the tasks of the upper level of control and building a complex information model of the object under study. The resulting models make it possible not only to determine the functional interaction of individual independent technological problems, but also to justify the choice of methods and tools for their solution. This is of particular importance in the system of professional development of specialists. Information systems such as WellView (Peloton Company) or GeoView (TyumenNIIgiprogaz) are considered as examples.