bluuebunny/crossref_metadata_2025_split huggingface dataset:
Isotope separation by DC18C6 crown-ether for neutrinoless double beta decay of 48Ca
Authors: Rittirong A , Yoshimoto T , Hazama R , Kishimoto T , Fujii T , Sakuma Y , Fukutani S , Shibahara Y , Sunaga A 
Published: January 2022

Abstract
The isotope separation via liquid-liquid extraction (LLE) using crown-ether (DC18C6) was carried out in order to demonstrate the feasibility of calcium isotope enrichment, which aimed to find a cost-effective way to enrich calcium-48 (48Ca) for the study of neutrinoless double beta decay (0vββ) in the CANDLES project. The LLE results revealed that the extraction was solvent dependent in the presence of HCl and the distribution coefficient (D) increased approximately threefold (0.0546±0.0012) with 12 M HCl solvent under a 3.9 M CaCl2 (aq) (30% w/w) system. Furthermore, the HCl solvent maintained the calcium content attached to the crown-ether at lower feed concentrations. The reaction cell ICP-MS (Agilent 7900) with an additional H2 gas was used to analyze the isotopic composition. The single-stage separation factor of organic phase was found to be 0.992±0.003, 0.994±0.003, 0.996±0.004 for 48Ca/42Ca, 48Ca/43Ca, and 48Ca/44Ca, respectively in the extracted organic phase of 3.3 M CaCl2 (aq) (30% w/w) system. The obtained results were comparable with the HCl solvent system. As a result, without the addition of an acidity reagent, the production of the enriched 48Ca isotope via LLE was highly feasible. To improve the mass production of enriched 48Ca, filter separation was applied in order to shorten the time required and to study various volumes of the extraction system. The results indicated that the extraction efficiency of filter LLE was comparable to conventional LLE. Filter LLE resulted in more than threefold reduction in time required (approximately 10 minutes for a complete single-stage separation) in comparison with a conventional LLE, consequently implying great potential in the enrichment and mass production via filter LLE.
Separation of mixtures substances with similar properties in horizontal rotary mass transfer columns
Authors: Khoroshilov A V , Sizov A P 
Published: January 2022

Abstract
Information on the use of rotary columns in the processes of fine separation, that is, the separation of substances with similar properties, including isotopes, is systematized. The design features and test results of a new generation of horizontal rotor columns with a rotating mass transfer part are considered in most detail. The results of the use of such columns are presented, both in the rectification of a standard mixture of substances with similar properties, and in the separation of isotopes by the chemical exchange method. A comparison of the results obtained with similar data for classical vertical columns is given, and possible options for the spatial arrangement of horizontal rotor devices are presented.
Application of LTE-U Technology in Train-Ground Communication of Urban Rail Transit
Authors: Song CZ , Liu XJ , Liu WZ 
Published: January 2022

Abstract
With the development of intelligentizing of Urban Rail Transit (URT), the data that need to be transmitted between train and OCC (Operational Contral Center) has increased significantly, and the licensed spectrum range is gradually unable to satisfy the data transfer task of URT communication systems(URT-cs). Therefore, this article considers to use LTE-U (Long-Term-Evolution in unlicensed spectrum) technology to deploy this communication system in unlicensed spectrum. In view of the interference caused by the introduction to WLAN system which have already been deployed in unlicensed spectrum, a dynamic spectrum range duty cycle adjustment scheme based on Q-learning algorithm is proposed to achieve coexistence of the two system. The scheme takes spectrum range as state, modelling the spectrum range allocation as a Markov Decision Process, obtains the spectrum range allocation strategy through Q-learning algorithm. Simulation results show that, compared with fixed spectrum allocation, the proposed scheme has a higher throughput and user satisfaction. Realizing the transmission task of URT-cs while meeting the user satisfaction of the WLAN system, and the problem of spectrum resources insufficiency of URT-cs is well solved.
Damage and dynamic response of precast bridge box girder und er blast loading
Authors: Hu ML , Ren F , Zhang YY 
Published: January 2022

Abstract
This study numerically investigates the damage and dynamic response of precast bridge box girder subjected to blast loads. Numerical models are developed using LS-DYNA and validated against experimental tests. Then the calibrated modeling method is used to perform depth research on the effects of scaled distance, height-span ratio and concrete strength on the behavior of precast box girder subjected to blast loads. The results indicate, reduction of the scaled distance will transform the failure mode of precast box girder and increase the damage level. Conversely, increasing the height-span ratio will reduce the damage range in the transverse direction, but local damage will expand. Last but not least, enhancing the concrete strength can improve the anti-blast performance of girder. But when the concrete strength exceeds 32.4 MPa, the contribution to anti-blast performance is not obvious.
Mathematical modelling and analysis of profile meter
Authors: Wang Dh 
Published: January 2022

Abstract
The profiler measures the workpiece to reflect the contour curve shape of the surface of the workpiece. When measuring the same workpiece, the drawn contour curve will shift due to the different placement angle and horizontal position. In order to improve the measurement accuracy of the profiler, the paper proposes a new modelling and calculation method for the profiler. This method uses mathematical methods such as vectors and geometric relations to calculate parameters; then completes level correction by changing the coordinate system; finally, uses geometric methods and analogy inference methods to obtain the deviation between the calculated values of each parameter. The research results show that this method can realize the measurement of the profiler more accurately.
Numerical simulation of mechanical properties of short basalt fiber bundles reinforced concrete (SBFBRC)
Authors: Zhang P , Lv XL , Liu Y , Shao JG , Jin YG , Li CC , Huang YJ 
Published: January 2022

Abstract
The performance of short basalt fiber bundles reinforced concrete (SBFBRC) is studied in depth through numerical simulation. Based on the data of the flexural test of basalt fiber-reinforced concrete with 0% and 0.2% content, the basalt fiber-reinforced concrete is established by ABAQUS. The validity of the model is verified by the existing test data. The influence of basalt fiber bundle content, length, and diameter on the compressive strength of concrete is studied. The results show that the load-displacement curve obtained by the simulation in this paper is approximately the same as the curve obtained by the experiment, and the simulated peak load and peak deflection are similar to the average value of the test group, which reflects the accuracy of the model. Parameter analysis shows that with the increase of fiber bundle content, the strength and toughness of concrete gradually increase; the increase of basalt fiber bundle length has no obvious effect on improving the compressive strength of concrete; when the fiber bundle content is constant, it is increased appropriately. The aspect ratio of the fiber bundle is beneficial to the improvement of compressive strength and toughness.
Vibration and noise suppression method of transformer
Authors: Yu XC , Zou DP , Fan MZ , Dong X , Du F 
Published: January 2022

Abstract
Aiming at the problem of noise and vibration of distribution transformer body and base connector under heavy load, the corresponding relationship between vibration and noise, load and power factor of distribution transformer is studied in this paper. In order to improve the operation reliability of distribution transformer, a noise and vibration suppression method based on load scenario optimization is proposed. From the aspects of design reliability, data detection and noise level correction, the typical relationship between the increase of noise level and DC current, noise spectrum and DC bias noise is obtained, and the DC bias limiting measures and correction suggestions are given.
Detection and optimization of viscous oil viscosity and vissity reducer in alx gas well
Authors: Wang FP , Zhang GF , Wang Y , Hao CX 
Published: January 2022

Abstract
The optimum viscosity of heavy oil is the key index to maintain the normal production of gas wells. This paper designs a new detection and optimization method of visit oil visibility and visibility reducer in alx gas well. Firstly, through the flow pattern criterion and flow pattern distribution diagram of gas-liquid two-phase flow in horizontal pipe, the propagation velocity of wave in the downstream is determined by extreme value method, and the maximum viscosity equation of heavy oil carried by air in annular fog state is established. Then, according to the maximum viscosity equation, the maximum viscosity of the heavy oil carried by the gas flow is 513.7 MPa. Finally, taking alx gas well as an example, 11 kinds of viscosity reducer were selected from water-based viscosity reducer and oil-based viscosity reducer. Under the conditions of wellhead temperature of 9 ° C and bottom hole temperature of 34 ° C, five samples with different concentrations were mixed with heavy oil, the rheological properties of the sample set were tested, and the rheological parameters and apparent viscosity of heavy oil were calculated. The experimental results show that low dosage of oil-based tackifier can effectively reduce the viscosity of heavy oil, and the optimal dosage range is 22% to 25%.
Experimental Study on Shear Performance of Interface between Polyvinyl Alcohol Fiber Engineered Cementations Composite (PVA-ECC) and Concrete
Authors: Liu HB , Liu XP , Li Y , Wang XT , Zhang SL , Jiang ZQ 
Published: January 2022

Abstract
In order to optimize the shear resistance of polyvinyl alcohol fiber cement-based composites (pva-ecc). In this paper, four specimens with different roughness interfaces between pva-ecc and old concrete are tested and studied. Based on the uniaxial compression test, the shear strength of four interface specimens and their interface failure types are obtained. According to the test data, the ratios of the shear strength of the four specimens to the strength of the whole specimen are 18.95%, 27.27%, 45.48% and 92.2% respectively.
Study on CO2 Adsorption and Permeance of Porous Carbon and Nitrogen Membranes Co-regulated by Charge and Strain
Authors: Li Xue , He Wenhao , Hou Xiaonan , Zhao Li , Zhao Ge , Lu Guiwu , Chen Junqing 
Published: January 2022

Abstract
In order to capture and separate CO2 effectively, a novel method of controlling gas permeance by charge and strain is proposed, which has the superiority of controlled dynamic. The effects of porous C9N7 nanosheets on CO2 capture and permeability under different charge quantities and strains were analysed by molecular dynamics (MD) simulations and first-principles density function (DFT) calculations. The molecular permeability of CO2 can be as high as 5.9 × 107 GPU (CO2/CH4 separation) through 5 e- charge regulation. In addition, CO2 permeability increased with the increase of tensile strain, and the maximum permeability of 9% stretched C9N7 membrane is 3.6 × 107 GPU. On this basis, the method of combining negative charge and tensile strain was adopted to study the synergic effect. Under the condition of negative charge of 1 e- and tensile strain of 3%, CO2 permeability (CO2/CH4 separation) reached 3.2 × 107 GPU, which was 8 times of CO2 permeability when only 3% strain was added and 9 times of CO2 permeability when only 1 e- was added. Additionally, under the circumstance of negative charge of 5 e-, the CO2 obtained extra electrons -0.0666 e compared with natural C9N7 membrane. These results provide theoretical guidance for the development of highly controllable materials with CO2 capture and separation.
Analysis of Type IV Creep Failure for P91 Steel Welded Joint Based on Thermal Displacement of Steam Pipeline
Authors: Dai Zhen , Liu Changfu , Tao Kangning , Zhang Yiwen , Fang Lulu 
Published: January 2022

AbstractType IV creep failures tend to occur on fine grained heat affected zone (FGHAZ) of P91 steel welded joint after long-term service at high temperature. In this paper, simulation of finite element is applied to analyze the stress response of the component. Experimental result of stress obtained from real-time monitoring is conducted to verify the simulation. The research results show that the concentration of maximum principal stress is caused by thermal displacement of the piping system. The microstructure of the welded joint is studied by SEM and EDS and the area in which maximum principal stress concentrates is in good agreement with distribution of creep cavity, that is the characteristic of Type IV creep failure in earlier stage. The value of maximum principal stress is improved and the distribution is changed, which are sensitive to thermal displacement cooperation. So thermal displacement that results in accumulation of creep cavity and Type IV cracking is regarded as remarkable factor.
Study on Preparation of Fuel Oil from Three Kinds of Molecular Sieve Catalytic Cracking Waste Lubricating Oil
Authors: Gong Jing 
Published: January 2022

Abstract
Three different molecular sieves hy, Rey and self-made Ti-MCM-41 were used as catalysts to produce fuel oil from catalytic cracking waste lubricating oil, the effects of reaction temperature and catalyst dosage on the yield of liquid product were investigated, and the distribution of carbon atoms and the distribution of alkanes, olefins, cycloalkanes and aromatics in liquid products obtained by cracking reaction with different catalysts were analyzed. The results show that, under the condition of adding 0.35g catalyst to 100g waste lubricating oil at 400°C, the catalytic effect of Ti-MCM-41 is the best. The yield of liquid product is 69.6%, which is more suitable for cracking waste lubricating oil than hy and Rey. Different catalysts have different selectivity for the liquid products of cracking reaction, the carbon number in the liquid products obtained from Ti-MCM-41 catalytic cracking is the most widely distributed in the range of light components, in which the contents of alkanes, cycloalkanes and aromatics are relatively high, which is consistent with the main chemical components of gasoline, and does not contain olefins, compared with the liquid products obtained from hy and Rey catalytic cracking, it is more suitable to be used as the blending component of commercial gasoline.
Design of Environment Monitoring System on Shipbuilding Outdoor
Authors: Liu Caiyun , Zhu Dapeng , Shi Shouchuang , Teng Li , Ding Yong , He Jiajian 
Published: January 2022

Abstract
Shipbuilding painting is the key part of hull construction outfitting and painting integration. General section painting, dock painting and terminal painting, are collectively referred to as shipbuilding outdoor painting, which is one of the major sources of pollution for ship building and repair because of its fugitive emission and volatile. In this paper, the environmental monitoring tasks of outfield painting are summarized based on the analysis of the current situation of industry monitoring. The key technologies such as communication and wiring, identification and conversion of heterogeneous data are broken through, and the environmental monitoring system for shipbuilding outdoor painting is built. The emission monitoring threshold was determined by combing relevant national/industry standards. The system implementation scheme is designed to provide a feasible scheme for green shipbuilding and repair, and promote the transformation and upgrading of the shipbuilding industry.
An Insight into the Effect of Rice Straw Biochar on Compressive Strength and Thermal Conductivity of Cement
Authors: Zhang Dongyun , Han Tong , Wang Jie , Sun Chengwan , Jiang Xiao-yu , Ni Zhenyu , Guo Jianhua 
Published: January 2022

Abstract
It is well known that is very important to improve the quality of cement material concerning its compressive strength and thermal conductivity, which may reduce its quantity of usage and improve the heat maintenance of a structure compared with the traditional cement. In order to improve the properties of cement and other building materials, the test pieces were prepared by incorporating rice straw biochar with different pyrolysis temperatures into cement paste, and the compressive strength and thermal conductivity were tested after curing under both wet and dry conditions. The results showed that with the increase of biochar incorporation, the strength and thermal conductivity of the test blocks were decreased, but the thermal insulation performance of them was increased, and the quality and density of the test block were reduced. Under the condition of wet curing, the strength of the test pieces enhanced greatly with the dosage of 1% and 5%. When the dosage was 1%, the strength of the wet curing test block was the highest, which was increased by 51.06% compared with the blank control. The block strength increased by 14.98%; the thermal conductivity of the test piece incorporating biochar was reduced, and the test piece with 10% of the dry curing showed better thermal insulation performance, and the thermal conductivity was reduced by 39.21%. It can be seen that the addition of biochar improves the strength of the test block and optimizes the thermal insulation performance of the cement.
Research on Dynamic Constitutive Model and Fracture Characteristics of Two High Strength Steels
Authors: Li Xiangyu , Li Fugang , Liang Minzu , Zhang Kefan , Tian Zhandong 
Published: January 2022

Abstract
58SiMn and 50SiMnVB are commonly used shell materials in bombs, and their dynamic constitutive model and fracture properties directly determine the mass distribution of the bomb. Tensile tests were carried out on two high-strength steels, and the parameters of the yield point, tensile strength and plastic failure strain as well as the John-Cook model were determined. The fracture morphologies of the two steels in the quasi-static tension and in the dynamic tension were analyzed. The research results show that the yield strength of 58SiMn steel remains unchanged with increasing strain rate. The yield strength and tensile strength of 50SiMnVB increase as the rate of elongation increases, and the ability to plastically deform decreases, which shows the properties of embrittlement under high speed loading. With the same elongation rate, 50SiMnVB steel has higher strength and toughness. 58SiMn steel is a tensile brittle fracture from a macroscopic point of view and a quasi-split fracture from a microscopic point of view; 50SiMnVB steel is a mixed lap shear fracture under axial tensile load. With increasing loading rate, the tensile fracture tends to pure shear fracture.
GO Replaces PEDOT:PSS as the Hole Injection Layer of Quantum Dot Light-Emitting Diodes
Authors: Yan Zhenzhen , Zhang Yubao , Zhang Qin , Sun Juan , Xu Zhangwang , Ding Lei , Hai Xia 
Published: January 2022

Abstract
In this paper, graphene oxide is used instead of poly (3,4-ethylenedioxythiophene): poly (phenylethylenesulfonic acid) PEDOT:PSS as the hole injection layer of quantum dot light-emitting diodes. The experimental results prove that graphene oxide irradiated with ultraviolet for an appropriate time can improve the performance of the device. Compared with traditional devices, the luminance is increased by 1.9 times and current efficiency of the device is increased 2.4 times. In addition, the turn-on voltage was reduced from 2.8 V to 2.4 V. The improvement of these photoelectric properties is mainly due to the fact that graphene oxide after ultraviolet irradiation can form a good energy level structure with the anode and the hole transport layer, which is more conducive to hole injection.
Research on Improved Arc Model of Isolating Switch and VFTO Characteristics
Authors: Yang Zhuangzhuang 
Published: January 2022

Abstract
The simulation of very Fast Transient overvoltage (VFTO) requires an accurate isolating switch arc model. Based on gas discharge theory, the trend of electron number in the gap is analyzed by particle continuity equation simulation. Based on this, the traditional time-domain arc resistance model is improved, and combined with the characteristics of time-domain arc resistance model, dynamic arc model and normal distribution, the improved arc model is established, which conforms to the physical law of arc discharge process of isolating switch. The simulation model of simulation experiment platform was established, and the simulation waveform obtained by the improved arc model, exponential resistance arc model and other arc models was compared with the experimental waveform to prove the accuracy of improved arc model.
Study on the Preparation of Zn-Doped NaA Molecular Sieve and Its Photocatalytic Performance
Authors: Du Qingyang , Xu Huijun , Yu Zhihao , Liu Baoliang , Peng Qian , Li Dongsheng , Ben Tao , Yu Huaqin 
Published: January 2022

Abstract
Zn-doped NaA molecular sieves were prepared by hydrothermal method using zinc nitrate, sodium metaaluminate, silica sol, etc. as raw materials. The samples were characterized by XRD, SEM, FT-IR, etc., using 300W xenon lamp as the light source. Rhodamine B (RhB) was used as the target degradant for photocatalytic experiments for its photocatalytic activity. The results showed that zinc ion doping increased the number of active sites on the NaA molecular sieve, effectively reduced the photoelectron-hole recombination probability in the molecular sieve, and improved the photocatalytic activity. The degradation rate of rhodamine B was 50.8% after 2 hours of light exposure, and its photocatalytic process complied with the Langmuir-Hinshelwood first-order kinetic equation.