bluuebunny/crossref_metadata_2025_split huggingface dataset:
Accurate Data Match and Call Method for the Thermal Compensation Database of the Reflector Antenna
Authors: Yan Yuefei , Xue Song , Hu Xinlan , Lian Peiyuan , Wang Yan , Li Lin , Xu Qian , Wang Na , Zhao Wulin , Zheng Yuanpeng , Wang Congsi 
Published: March 2022

Abstract
The influence of thermal deformation on the performance of reflector antennas has become increasingly significant with the increasing aperture and working frequency. The use of a thermal compensation database is an efficient method to compensate for the deformation caused by the non-uniform temperature distribution. However, how to efficiently and accurately match and call the database remains as one of the tough challenges for the antenna thermal compensation system to achieve real time compensation. Therefore, this study proposes a data match and call method for the thermal compensation database of the reflector antenna, matching the database from three aspects: the overall rms match of temperature data, the similarity area match of each data sample, and the key area match of key structural positions. The validation of this method is demonstrated in an example. The difference between the pointing adjustment amount calculated by the matched data and the collected data was found to be less than 1″, which satisfied the requirements of practical engineering, thus achieving real-time thermal compensation of the antenna.
Self-organized rod undulations on pre-stretched textiles
Authors: Guiducci Lorenzo , Kycia Agata , Sauer Christiane , Fratzl Peter 
Published: March 2022

Abstract
Textile technology is a traditional approach to additive manufacturing based on one-dimensional yarn. Printing solid rods onto pre-stretched textiles creates internal stresses upon relaxation of the pre-stretch, which leads to buckling-induced out-of-plane deformation of the textile. Similar behaviours are well known to occur also in biological systems where differential growth leads to internal stresses that are responsible for the folding or wrinkling of leaves, for example. Our goal was to get a quantitative understanding of this wrinkling by a systematic experimental and numerical investigation of parallel rods printed onto a pre-stretched textile. We vary rod thickness and spacing to obtain wavelength and phase coherence of the wrinkles as a function of these parameters. We also derive a simple analytical description to rationalize these observations. The result is a simple analytical estimate for the phase diagram of behaviours that may be used for design purposes or to describe wrinkling phenomena in biological or bioinspired systems.
Maize nutrient yield response and requirement in the maize belt of Nigeria
Authors: Aliyu K T , Kamara A Y , Huising E J , Jibrin J M , Shehu B M , Rurinda J , Adam A M , Mohammed I B , Vanlauwe B 
Published: March 2022

Abstract
Absence of site-specific nutrient recommendation and high spatial variability of soil fertility are major factors affecting maize response to applied nutrients in Nigeria. In this study, we assessed maize response to applied nutrients and nutrient use efficiency in different management zones (MZs), for designing site-specific nutrient management recommendations for maize in the maize belt of Nigeria. The maize belt in Nigeria was earlier delineated into four MZsMZs (MZ1 to MZ4) based on soil properties. In the current study, data from two different trials, nutrient omission trials (N = 293) and fertilizer response trial (N = 705), conducted in the years 2015–2017, were extracted for MZ1 to MZ3; to analyze maize yield responses to application of N, P and K, and secondary and micro-nutrients. Maize yield response to K application was only positive in MZ1. Responses to N and P application were positive for all MZs. However, the magnitude of maize response to P varied between the MZs, indicating a differentiation in the degree to which P is limiting maize production in the study area. Average nitrogen requirement was higher for MZ3 (138 kg ha−1), than for MZ2 and MZ1 (121 and 83 kg ha−1, respectively). Average P requirement was higher for MZ3 (45 kg ha−1) than for the other zones. Potassium requirement was 26% and 28% higher in MZ2 and MZ3 compared with MZ1 (∼15 kg ha−1). The use of the specific nutrient rates for the MZs may reduce risks and uncertainties in crop production. The delineated MZs of the maize belt of Nigeria that incorporates spatial variability in soil fertility conditions are useful for nutrient management for larger areas.
Amplified wintertime Barents Sea warming linked to intensified Barents oscillation
Authors: Cai Ziyi , You Qinglong , Chen Hans W , Zhang Ruonan , Chen Deliang , Chen Jinlei , Kang Shichang , Cohen Judah 
Published: March 2022

Abstract
In recent decades, the Barents Sea has warmed more than twice as fast as the rest of the Arctic in winter, but the exact causes behind this amplified warming remain unclear. In this study, we quantify the wintertime Barents Sea warming (BSW, for near-surface air temperature) with an average linear trend of 1.74 °C decade−1 and an interdecadal change around 2003 based on a surface energy budget analysis using the ERA5 reanalysis dataset from 1979–2019. Our analysis suggests that the interdecadal change in the wintertime near-surface air temperature is dominated by enhanced clear-sky downward longwave radiation (CDLW) associated with increased total column water vapor. Furthermore, it is found that a mode of atmospheric variability over the North Atlantic region known as the Barents oscillation (BO) strongly contributed to the BSW with a stepwise jump in 2003. Since 2003, the BO turned into a strengthened and positive phase, characteristic of anomalous high pressure over the North Atlantic and South of the Barents Sea, which promoted two branches of heat and moisture transport from southern Greenland along the Norwegian Sea and from the Eurasian continent to the Barents Sea. This enhanced the water vapor convergence over the Barents Sea, resulting in BSW through enhanced CDLW. Our results highlight the atmospheric circulation related to the BO as an emerging driver of the wintertime BSW through enhanced meridional atmospheric heat and moisture transport over the North Atlantic Ocean.
Addendum: Painlevé transcendents and

PT

-symmetric Hamiltonians (2015 J. Phys. A: Math. Theor.
48 475202)
Authors: Bender Carl M , Komijani Javad 
Published: March 2022

Abstract
This paper is an Addendum to reference Bender and Komijani (2015 J. Phys. A: Math. Theor.
48 475202) (which stems from an earlier paper Bender et al (2014 J. Phys. A: Math. Theor.
47 235204)), where it was demonstrated that unstable separatrix solutions to the Painlevé equations I and II are determined by

PT

-symmetric Hamiltonians. Here, unstable separatrix solutions of the fourth Painlevé transcendent are studied numerically and analytically. It is shown that for a fixed initial value such as y(0) = 1 a discrete set of initial slopes y′(0) = b

n
give rise to separatrix solutions. Similarly, for a fixed initial slope such as y′(0) = 0 a discrete set of initial values y(0) = c

n
give rise to separatrix solutions. For Painlevé IV the large-n asymptotic behavior of b

n
is b

n
∼ B
IV
n
3/4 and that of c

n
is c

n
∼ C
IV
n
1/2. The constants B
IV and C
IV are determined both numerically and analytically. The analytical values of these constants are found by reducing the nonlinear Painlevé IV equation to the linear eigenvalue equation for the sextic

PT

-symmetric Hamiltonian

H
=

1

2

p

2

+

1

8

x

6

.
Preface
Authors: Ning Dezhi 
Published: March 2022

Since its inception in 2020, EMET conferences (International Conference on Energy Material and Energy Technology) were successfully held for last two years, online (2020, 2021), attracted delegates from a lot of countries and regions including China, Australia, Poland, Slovenia and Japan. As an annual international conference, EMET aims at being a fast and efficient platform for researchers and scholars worldwide to discuss recent developments in the area of Energy Material and Energy Technology.
The Second International Conference on Energy Material and Energy Technology (EMET 2021) was scheduled to be held in Sanya, China. Due to the COVID-19 pandemic, the meeting had to be changed from onsite to online during November 19-20, 2021 for academic exchanges & discussions.
There were about 30 experts and scholars attending the conference. Three sessions were included: keynote speeches, oral presentations and poster presentations, covering a wide range of Energy Material and Energy Technology. There were 3 keynote speakers, 5 oral presenters and 1 poster presenter sharing their latest research results and ideas with the audience. Details about the presentations can be found in the Conference Overview part.
This conference proceeding included 16 accepted articles selected from 31 submissions, all the papers have been through rigorous review and process to meet the requirements of International publication standard. We would like to express our gratitude to the reviewers of these manuscripts, who provided constructive criticism and stimulated comments and suggestions to the authors. We are extremely grateful as organizers, technical program committee and editors and extend our most sincere thanks to all the authors for their excellent contribution and work. Our sincere gratitude also goes to the IOP Publishing editors and managers for their helpful cooperation during the preparation of the proceeding.
On behalf of the Organizing Committees of EMET2021.
List of Technical Program Committee, Conference Overview, Conference Schedule, Keynote Speeches, Oral Presentations and Poster Presentations are available in this pdf.
Research on adsorption and damage characteristics of slick water in coalbed methane development
Authors: Sun Wei , Li Bojun , Zhu Weiping , Li Yuan , Wang Qian , Yao Erdong , Zhou Fujian 
Published: March 2022

Abstract
In the process of coalbed fracturing, the drag reducers absorbed on the surface of the coalbed causes water lock damage and decreases gas production efficiency of coalbed methane. Thus, research on low-damage coalbed drag reducers is of great significance. Aiming at four drag reducers with different molecular weights, the law of drag reducers adsorption was investigated through static adsorption test and contact angle tests. Afterwards, a core displacement experiment was carried out to study the damage rate of slick water to the coabed, and the nanoemulsion CND was used for competitive adsorption to relieve the influence of fracturing fluid adsorption on the core damage. Finally, through the static adsorption test results, combined with core SEM images before and after displacement, the internal relationship between adsorption and damage was revealed, and the optimal principles and control methods for reducing the damage of drag reducers to the coalbed were proposed. The results show that: the drag reducers with larger molecular weight are more likely to adsorb in the coalbed, which caused more severe damage to the coalbed reservoir. In contrast, drag reducers with lower molecular weight show a lower damage rate (less than 20%) to the reservoir, which is suitable for the preparation of low-damage slick water. Mechanistic studies have shown that the drag reducers is adsorbed on the surface of the organic matter in the coalbed, leading to the exposure of the hydrophilic end. Therefore, the hydrophilic area on the surface of the coal powder was enlarged, which forms the water film adhesion in the pore throat, causing the water lock to block the gas and liquid seepage channel, resulting in reduced permeability; Nanoemulsion and coal powder are more closely adsorbed, which can reduce the adsorption of drag reducers through competition with the adsorption matrix, reduce water lock damage, facilitating the subsequent drainage and gas collection process.
High-temperature area migration characteristics of loose coal spontaneous combustion based on experimental scale of semi-enclosed experimental system
Authors: Zhao Jingyu , Zhang Tinghao , Guo Tao , Zhang Yuxuan , Song Jiajia 
Published: March 2022

Abstract
According to the actual combustion characteristics of loose coal, and in view of the advantages and disadvantages of the existing research equipment for the high-temperature area, a simulated experimental device for the development of coal fire was designed and fabricated. The coal sample of Mengcun coal mine in Xianyang, Shaanxi Province China as the research object, the device was used to simulate the combustion of loose coal, and the distribution and movement of high-temperature area during the combustion were studied. The temperature change of the high-temperature area was obtained from normal temperature to ignition. The results showed that during combustion, the temperature rose first with the increase of time and then decreased. When the temperature reached 309.5 °C, the coal sample started to combustion. In addition, the temperature decreased to the ambient temperature after 600 h. The high-temperature area of the selected coal sample was concentrated in the middle part and the back part of the furnace, which was for the poor thermal conductivity, water evaporation of coal intrinsic quality. Moreover, the temperature decreases in turn during the downward propagation of the high-temperature area in the depth. And its decline to the limit oxygen concentration (1%∼3%) is similar to reaching the combustion point temperature. Due to the influence of water content, pore and oxygen concentration, the movement of oxygen concentration and high temperature areas are mainly moved to the position and crack direction near the wind direction of coal-like combustion, showing nonlinear movement rules.
Challenges and opportunities for the energy management of sustainable data centers in smart grids
Authors: Wang Hongliang , Tang Daogui 
Published: March 2022

Abstract
With the increase of cloud computing and internet services, data centers are emerging to satisfy the requirement, leading to incremental energy consumption demand and emissions of green house gases. Thus, integration of renewable energies with the traditional power grid is preferred to reduce the environmental impact and increase energy efficiency, which lead to a demand of energy management strategies to coordinate the energy demand and generation. In this paper, we review the challenges for the sustainable data centers in smart grids with regards to energy management strategies, integration with renewable energies and cyber-attacks and propose possible solutions. Through the analysis of the data centers from the perspective of both smart grids level and micro-grid level, the research challenges and potential research directions in the energy management of sustainable data centers have been discussed.
Thermodynamic performance analysis of comprehensive utilization system driven by geothermal energy
Authors: Liu Xueling , Niu Jintao , Wang Jiansheng , Zhang Huipeng , Fu Yuguo , Zhu Jianxiao , Dong Liwei 
Published: March 2022

Abstract
In order to improve the utilization rate of geothermal energy and realize the comprehensive utilization of geothermal energy. In this paper, a comprehensive utilization system using geothermal energy is proposed, and the thermodynamic performance under different working conditions is studied and analysed. And the Pareto method is used to optimize the calculation of different optimization options. The conclusions are as follows: The system can supply heating, cooling and electricity at the same time, and can regulate the electricity and cooling capacity according to the demand. The optimal pressure exists in the system in front of the turbine inlet to maximize the net output power of the system (when k=0). Due to heating needs, the adjustable range of k decreases with increasing of the turbine inlet pressure when the pressure of the turbine inlet is greater than 13.83 MPa. When there are differences in the importance of different output objectives, the Pareto solution is different. The importance degree of output objectives can be defined according to the demand, so as to solve the corresponding optimal solution.
Effect of flow field on particle erosion in eroded square elbows
Authors: Lin Nan , Ju Jianbo , Zhang Hao 
Published: March 2022

Abstract
Erosion often occurs on the inner wall of gathering pipelines. Even if the particle size is small, the cumulative erosion may also cause serious erosion on pipelines and even leads to leakages. In order to learn erosion on elbows of pipelines in natural gas stations, mechanisms analysis and computational fluid dynamics (CFD) method were used to investigate erosion on square elbows based on a case of elbows erosion in a gas gathering station. The results show that there are erosion sensitive areas on the eroded surface of elbows which are more likely to be eroded, erosion prediction of elbows could be obtained through CFD method. It is concluded that researches on erosion are important in oil and gas gathering industry and could be a good guiding for life prediction, inspection and operational safety protection of gathering pipelines.
Experimental study of the temporary plugging pattern of perforations by multi-particle size composites
Authors: Zhang Kuangsheng , Tang Meirong , Du Xianfei , Yuan Lishan , Zhou Fujian 
Published: March 2022

Abstract
In the process of temporary plugging and diverting fracturing of horizontal wells, the seating of large-size temporary plugging balls on the perforation is unstable and the plugging efficiency of irregular perforations is low, so a smaller-size composite temporary plugging agent is needed to improve the temporary plugging efficiency. In this study, based on the actual situation of Changqing oilfield, three kinds of temporary plugging materials with small particle sizes were used to plug the perforation. A simulated perforation plugging device with different permeability was built by artificial cores, and the plugging law and pressure-bearing capacity of the composite temporary plugging materials inside the perforation were studied. The results show that the temporary plugging materials with particle sizes smaller than the diameter of the perforation can form a plug inside the perforation, and the plugging zone formed inside the perforation is discontinuous. The plugging zone has good pressure-bearing performance, and the indoor blocking pressure is more than 15 MPa. The orthogonal experiments showed that the importance of three kinds of temporary plugging agents in the composite temporary plugging materials were 3-4 mm particles, 0.15 mm powder, and 1-2 mm particles, and the optimal ratio is 3:3:2. This study provides a technical basis for the design of the temporary plugging and diverting fracturing.
Implementation of a combined algorithm designed for increasing the reliability of information systems
Authors: Bychkov S S , Popov A M , Gorbacheva A K 
Published: March 2022

Abstract
This paper considers the results of experimental studies of the previously presented algorithm designed for increasing the reliability level of information systems. The data on the organization and conduct of the studies is provided to clarify their meaning. Within the framework of the study conducted, the obtained experimental data of simulation modeling and the functioning data of existing information systems are compared. The hypothesis of homogeneity of the structure of information systems has been formed, thereby reconfiguring the presented algorithm into a model for the analysis of information systems. The results presented can be used in further research activities. The obtained data on the opportunity to predict the functioning of information systems can be used for economic planning.
Determination of local heat transfer coefficient during boiling in annular channels of small diameters
Authors: Khodenkov A A , Delkov A V , Khodenkova E V 
Published: March 2022

Abstract
The presented work considers various methods for calculating the local heat transfer coefficient during boiling in annular channels of small diameters. The specificity of two different boiling modes, convective and nucleate, is analysed. The described calculation methods are compared.
The dynamics of pore formation in the electron beam welding
Authors: Oreshenko T G , Bocharova O A 
Published: March 2022

Abstract
The main mechanisms of porosity formation in electron beam welding are described by authors. The dynamics of changes in the shape, location and velocity of the pores in the weld pool is considered. The authors present the relationships linking the parameters of the electron beam welding process with the shape and location of the pores and their experimental data.
New quality of measuring capabilities
Authors: Zhirnova E A , Trifanov I V , Sukhanova O A , Mednikov D M 
Published: March 2022

Abstract
The issues of improving the quality of measurements based on the use of information technology and the informatization of the metrological infrastructure are investigated using the example of measurements of volumetric fluid flow. The functional diagram of an automated calibration unit for checking water flow meters is analyzed. As a result of the research, a model for the formation of a new quality of measuring capabilities has been developed. The use of metrological self-monitoring of calibration facilities is justified.
Correlation of ground penetrating radar and nuclear density gauge data to determine the density of asphalt pavement
Authors: Sarah Tengku Amran Tengku , Syafiq Mohd Amin Mohamad , Ridzuan Ahmad Mohamad , Azreen Masenwat Noor , Sani Suhairy , Fajri Osman Mohd , Sayuti Shaharudin , Abdullah Hamidi Syed Mamat Syed , Hassan Haziq , Iwana Rohesan Anis 
Published: March 2022

Abstract
This paper demonstrates the field performance of Ground Penetrating Radar (GPR) as a non-destructive testing tool to predict in situ asphalt pavement. In previous study, GPR has been used successfully in a variety of pavements application such as determining layer thickness, detecting subsurface distresses, and others. Nuclear Density Gauge (NDG) is specifically designed to measure the moisture and density of soils, aggregates, cement, and lime treated materials, and also to measure the density of asphalt concrete. Alternative analysis approaches by correlating the GPR and NDG data had been performed for density prediction of asphalt pavement. A density model name Al-Qadi, Lahouar, and Leng (ALL model) was used to predict the density of the asphalt pavement from the GPR data correlate with NDG database. This study shows that density for asphalt pavement from GPR data provide reasonably accurate density prediction when ALL model approach was used.
Small beam dosimetry by using Al2O3 optically stimulated luminescent (OSL) dosimeters at high energy photons and electrons
Authors: Fahmi Mohd Yusof Mohd , Amirah Shariff Nur , Sajidah Muhammad Fauzi Nur , Bazlie Abdul Kadir Ahmad , Mohd Isa Noriza 
Published: March 2022

Abstract
The study focused on the measurements of depth dose for small beam in the high energy photons and electrons. The percentage depth dose (PDD) was measured in 6 and 10 MV photons and 9 and 12 MeV electrons at 3 × 3 cm field sizes by using the Al2O3 optically stimulated luminescent (OSL) dosimeters. The PDD in OSL dosimeters were compared to those in ionization chamber and Gafchromic EBT3 film dosimeter. The results showed that the PDD in OSL dosimeters in lower photon and electron energies were in good agreement within 4% to ionization chamber and film. The PDD in 10 MV photons however showed gradual increase of deviation up to 10% beyond the depth of maximum dose (dmax). The surface doses in OSL dosimeters were significantly higher compared to those in ionization chamber and film dosimeter. The overall results suggested the suitability of OSL dosimeters to be used as indirect dosimetry works in high energy photons and electrons.