bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of the parallel flow shear on the ITG-driven turbulent transport in tokamak plasmas
Authors: Mazzi S. , Camenen Y. , Garcia J. , Zarzoso D. , Frigione D. , Garzotti L. , Rimini F. , Van Eester D. , JET Contributors  
Published: June 2022

Abstract
The impact of the parallel flow shear on the tokamak plasma stability and turbulent transport driven by the ion temperature gradient (ITG) modes is analyzed by means of local gyrokinetic numerical analyses. It is shown that the parallel flow shear increases the ITG growth rate in the linear regime, and induces a broadening and shift of the radial spectrum. Then, the different effects of the finite parallel shear on the ITG turbulence characteristics are deeply analyzed in the nonlinear regime. These studies highlight that a reduction of the thermal-ion turbulent heat flux is induced by a complex mechanism involving the nonlinear generation of an enhanced zonal flow activity. Indeed, the turbulent sources of the zonal flows are increased by the introduction of the finite parallel flow shear in the system, beneficially acting on the saturation level of the ITG turbulence. The study has been carried out for the Waltz standard case below the critical threshold of the destabilization of the parallel velocity gradient instability, and then generalized to a selected pulse of a recent JET scenario with substantial toroidal rotation in the edge plasma region. It is, thus, suggested that the investigated complex mechanism triggered by the finite parallel flow shear reducing the ITG turbulent heat fluxes could be complementary to the well-established perpendicular flow shear in a region with sufficiently large plasma toroidal rotation.
Symmetry-resolved entanglement in a long-range free-fermion chain
Authors: Ares Filiberto , Murciano Sara , Calabrese Pasquale 
Published: June 2022

AbstractWe investigate the symmetry resolution of entanglement in the presence of long-range couplings. To this end, we study the symmetry-resolved entanglement entropy in the ground state of a fermionic chain that has dimerised long-range hoppings with power-like decaying amplitude—a long-range generalisation of the Su–Schrieffer–Heeger model. This is a system that preserves the number of particles. The entropy of each symmetry sector is calculated via the charged moments of the reduced density matrix. We exploit some recent results on block Toeplitz determinants generated by a discontinuous symbol to obtain analytically the asymptotic behaviour of the charged moments and of the symmetry-resolved entropies for a large subsystem. At leading order we find entanglement equipartition, but comparing with the short-range counterpart its breaking occurs at a different order and it does depend on the hopping amplitudes.
Freezing transitions of Brownian particles in confining potentials
Authors: Mercado-Vásquez Gabriel , Boyer Denis , Majumdar Satya N 
Published: June 2022

Abstract
We study the mean first passage time (MFPT) to an absorbing target of a one-dimensional Brownian particle subject to an external potential v(x) in a finite domain. We focus on the cases in which the external potential is confining, of the form v(x) = k|x − x
0|
n
/n, and where the particle’s initial position coincides with x
0. We first consider a particle between an absorbing target at x = 0 and a reflective wall at x = c. At fixed x
0, we show that when the target distance c exceeds a critical value, there exists a nonzero optimal stiffness k
opt that minimizes the MFPT to the target. However, when c lies below the critical value, the optimal stiffness k
opt vanishes. Hence, for any value of n, the optimal potential stiffness undergoes a continuous ‘freezing’ transition as the domain size is varied. On the other hand, when the reflective wall is replaced by a second absorbing target, the freezing transition in k
opt becomes discontinuous. The phase diagram in the (x
0, n)-plane then exhibits three dynamical phases and metastability, with a ‘triple’ point at (x
0/c ≃ 0.171 85, n ≃ 0.395 39). For harmonic or higher order potentials (n ⩾ 2), the MFPT always increases with k at small k, for any x
0 or domain size. These results are contrasted with problems of diffusion under optimal resetting in bounded domains.
Dynamic Responses of the Pile-Saturated-Soil System to a Moving Load
Authors: Xu Bin , Xu Manqing , Li Kang 
Published: June 2022

Abstract
According to the basic solution of viscoelastic and saturated soil subjected to moving load on the surface and circular uniform harmonic load on the inside, the integral equation of soil-pile interaction under moving load in frequency domain is established by using Muki virtual pile method, and then the time-space dynamic response characteristics of a single pile in viscoelastic saturated soil to moving load vibration source are analyzed by using inverse Fourier transform. The factors that affect the dynamic response of single pile, such as load speed, length of single pile, saturated soil parameters, vibration source properties, etc., are analyzed and compared with the known results in related literature.
Experimental Study on Compressing and Insulation Performance of Recycled Fiber Concrete
Authors: Zengli Zhang , Yongkang Shen , Huan Yang 
Published: June 2022

Abstract
In order to study and explore the related changes of crack resistance, compressive strength and thermal insulation performance of recycled fiber concrete blocks with polyester fiber as the main component. The test blocks were designed and manufactured in the laboratory, three kinds of concrete test blocks with different specifications were obtained after curing for 28 days. Through experiments, three kinds of test blocks with different specifications were tested for thermal insulation performance, crack resistance and compressive strength. With the help of the electronic universal testing machine controlled by microcomputer, relevant data are obtained. The results show that the fiber concrete with polyester fiber as the main component has good crack resistance and thermal insulation performance, which can prevent new cracks and delay the development of cracks in matrix materials to a certain extent. In addition, waste clothes are used as raw materials for research to solves the problems of cost and environmental pollution of traditional fiber concrete, and reduces the pollution of traditional waste clothes treatment. Waste fabric is also a form of waste of social resources. Therefore, rational utilization of this potential huge resource is the inevitable requirement of a conservation-oriented society and a low-carbon life, and the only way for sustainable development.
Research on The Effect of Recycled Aggregate Replacement Rate on The Performance of Fresh Concrete
Authors: Shen Zhenzong , Wang Wangning , Yan Qingyao , Wang Zengqiang , Yin Zhuangfei , Yao Yunshi 
Published: June 2022

Abstract
In order to improve the utilization rate of recycled aggregate from construction waste, this paper studies the influence of recycled aggregate replacement rate on the performance of fresh concrete. The slump, 7d and 28d unconfined compressive strength of fresh concrete were studied by mixing recycled concrete with different replacement rates. The test results show that: compared with ordinary concrete, when recycled aggregate is completely replaced, the slump of concrete decreases by 58.8%, and the workability becomes worse; in the process of replacement rate from 0 to 100%, the 7d compressive strength decreases slowly, and the decline rate is 16.2%. The 28-day compressive strength decreased by 12.1%, and the mechanical properties decreased.
Numerical simulation of in-situ stress field characteristics about the dam site area of Baihetan Hydropower Station
Authors: Shan Zhigang , Ni Weida , Liu An 
Published: June 2022

Abstract
In order to study the geological history of the rock mass in the Baihetan dam site area, this paper carries out a numerical simulation study on the in-situ stress field in the dam site area of Baihetan Hydropower Station. With the help of numerical simulation technology, the macro distribution law of the in-situ stress field is discussed. The results show that the in-situ stress value in the dam site area belongs to medium ∼ high stress level. The large principal stress value of the powerhouse on the left and right bank will be close to or even greater than 25 MPa, furthermore the stress state are not good. The horizontal large principal stress is close to the horizontal small principal stress. The results of the paper reproduce the load action history of the rock mass in the dam site area, which provides a preventive theory for the safety of the dam construction of Baihetan Hydropower Station.
Finite element analysis of static performance of new fabricated double-layer upper flange composite beam
Authors: Xu Feng , Xie Kebin , Xu Wei 
Published: June 2022

Abstract
A new type of fabricated double-layer upper flange composite beam section is proposed to meet the requirements of greater structural headroom. The influence of the strength of cast-in-place concrete on the static performance of composite beams was studied by using finite element analysis method. The static performance of the new fabricated double-layer upper flange composite beam with the strength of cast-in-place concrete is obtained. Numerical simulation results show that with the increase of concrete strength, the bearing capacity of composite beams will increase to a certain extent. At the same time, there will be obvious stress concentration at the openings of the T-shaped steel web on the upper part of the section. In the actual design process, the distribution and shape of the openings still need to be optimized. In addition, the influence of span-to-height ratio and aspect ratio on the bearing capacity of new cross-section composite beams is also studied. The results show that the best span-to-height ratio and aspect ratio of the new section beam proposed in this paper are 15 and 4/9, respectively.
Finite Element Analysis on Mirco-Steel Tubular Pile Refilled Concrete Reinforced Structure Foundation
Authors: Shen Yongkang , Zhong Weiqiu , Xiong Shengyuan 
Published: June 2022

Abstract
Steel tubular pile technology is an effective method to reinforced foundation in retrofitting of existing buildings. Mirco-steel tubular pile is constructed with concrete filled steel tubular, the infilled concrete could reinforced the strength of mirco-pile and prevented the local-buckling of steel tubular. According to ANSYS software, a mode of finite element analysis was built with some function between mirco-pile and soil foundation, the mode was confirmed by some test data. The slenderness ratio and material strength were two important factors for the bearing capability of mirco-pile with concrete filled steel tubular. The bearing capability and some influence factors on concrete filled mirco-steel tubular piles were analyzed by factors analysis method. The mode of finite element analysis and factors analysis method on were applied for reinforced building foundation and referred to other application of concrete filled steel tubular.
Analysis of axial compression performance of steel - foamed ceramsite concrete composite structure wallboard
Authors: Hong Cheng , Tian Zhixiang , Liu Kai , Tu Bin , Zhang Tianlin 
Published: June 2022

Abstract
Through the finite element analysis of the vertical axial load test of 9 self bearing and self insulation precast walls, the effects of the thickness of section steel, the strength of section steel, the strength of foamed ceramsite concrete, the layout of section steel and the thickness of foamed ceramsite plate on the failure mode, bearing capacity and overall stress of the wall plate are studied. The research shows that the strength of foamed ceramsite concrete is the main factor affecting the wall stress-strain curve, the layout form of section steel and wall thickness are important factors, and the change of section steel thickness and section steel strength has little effect on the stress-strain curve. The strength of foamed ceramsite concrete decreases by 30%, the wall bearing capacity decreases by 15%, and the wall deformation increases by three times. Therefore, quality management should be strengthened in the production process of foamed ceramsite concrete to prevent the strength decline of foamed ceramsite concrete due to production reasons; Foamed ceramsite concrete and section steel frame are constrained to form a stressed whole, and the ribbed section steel frame bears the main load, which provides a basis for subsequent experimental research and engineering design.
Study on Seismic Performance of Wooden Column in Ancient Buildings under Secondary Loading
Authors: Han Xiaoli , Dai Jian , Qian Wei , Chang Lihong 
Published: June 2022

Abstract
In order to provide some scientific references for the restoration of ancient timber buildings, the wooden column was subjected to a secondary load through the quasi-static test. The seismic performance parameters of wooden column such as the damage of the wooden column, P-Δ hysteretic curve, P-Δ skeleton curve and stiffness degradation were analyzed. The test results showed that the wooden column could still maintain the lateral resistance capacity after the secondary load under the action of low reversed cyclic load. The hysteretic curve of the wooden column had a certain degree of a pinch effect, which indicated that the semi-rigid characteristic of the wooden column was reserved after the secondary loading. The lateral stiffness of the wooden column after the secondary load decreases with the increased of the lateral displacement. The lateral stiffness decreases with the increase of displacement. It showed that the wooden column still had good seismic behavior after secondary load.
Influence of Stochastic Aggregate on Ultrasound Propagation in Concrete
Authors: Zhang Lu , Jiang Zishi , Li Hongyu , Lu Yuchun , Zhang Ermao 
Published: June 2022

Abstract
The ultrasonic testing (UT) has been successfully utilized in many civil engineering fields (e.g. steel structures, RC structures, PC structures, highway, and railway) since the UT can provides an efficient and convenient on-site inspection of internal and external defects. However, many influential factors, such as aggregate, grading, mortar and cement porosity, may introduce various uncertainties to the UT measurement in the concrete due to its highly heterogeneities. Herein, the aggregate in concrete is one of the most influential factors of heterogeneities. To understand the influence of the aggregate on the mechanism of elastic wave propagation is essential to increase the detectability of UT in concrete. Meanwhile, it can provide the supportive evidence of detection, which can increase the reliability. In this paper, a two-dimensional concrete model with consideration of stochastic distribution of aggregate is established numerically. The influence of the quantity of concrete coarse/fine aggregate on ultrasonic attenuation is studied. It was found that the distributed condition of aggregate affects the propagation velocity and attenuation of ultrasonic wave in concrete. Therefore, the reliability of UT test depends on the UT frequency and aggregate.
Study of undisturbed soil test about slope angle of the expanded-plate affecting the failure mechanism of the NT-CEP pile under vertical tension
Authors: Chen Yang , Qian Yongmei , Hong Guang , Jin Yujie , Wang Ruozhu 
Published: June 2022

Abstract
In this paper, it is computer simulation studied that the influence of the slope angle of expanded-plate of the new-type concrete expanded-plate pile (the NT-CEP pile) to the uplift failure mechanism. The model piles of different slope angle are designed in undisturbed soil test, in which the effect about the bearing capacity of the NT-CEP pile and the failure behavior of the soil is analyzed, at the same time, the computer simulating analysis of finite element is assistant by the ANSYS software, to verify the test results. The innovation of this paper is mainly to test research methods, which improves and innovates the existing model test method and test equipment because of completing the test with undisturbed soil and ensuring the reliability of the test results. The research results of this paper will enrich and improve the design theory of the NT-CEP pile and play a necessary complement to the practical engineering application and a positive role in promoting the research and application of the NT-CEP pile.
Research on Blast Resistance of the Cylinder with Aluminium Foam under Internal Explosive Load
Authors: Li Xiangyu , Zhang Guodong , Liang Minzu , Tian Zhandong 
Published: June 2022

Abstract
Aluminium foam has an excellent performance in terms of impact resistance and energy absorption. The experimental and numerical investigations on the blast resistance of the cylinder with aluminium foam under internal explosive load are carried out in this thesis and the factors influencing the blast resistance are analyzed. First, experiments were carried out under internal explosive load with different relative densities and explosion loads, and the defections of inner and outer layers were obtained. Second, based on the voronoi technique, a 2D finite element model of sandwich cylinders with a core of aluminium foam was constructed, the effectiveness of the model was then confirmed by conflicting results from simulations and experiments. Finally, the finite element model was used to analyze the effects of characteristic cell size and explosive load, which were reflected in the energy absorption and deflection of the outer layer. The test results show that the simulation results agree well with the experimental results. The characteristic cell size has little influence on energy absorption. In the case of homogeneous cores, the energy absorption per unit of mass decreases linearly with increasing relative density and the deflections of outer layers increase slightly.
Seismic Capacity Evaluation of Existing Residential Buildings Based on Big Data
Authors: Miao Shuang , Haifen Jin 
Published: June 2022

Abstract
Based on big data, the seismic capacity of existing residential buildings is evaluated in this paper. More than 60 representative large and medium cities in China are selected. Key indexes of buildings are extracted by investigating the Internet data, government statistics and business data, and the logical relationship between the indexes is clarified. Then the dynamic analysis model based on probability theory is applied for seismic disaster prediction. Considering changes of seismic fortification level and proportions of different ages of residential buildings, a new evaluation method based on big data is presented to obtain the seismic capacity index of a city. It will provide data support for the reinforcement and reconstruction of existing residential buildings.
Braking performance test of portable underground light trackless special rubber tyred vehicle Development of equipment
Authors: Zhang Chunying 
Published: June 2022

Abstract
The braking system of trackless rubber tyred vehicles used underground in China is mostly composed of parking brake and service brake. The parking brake can effectively prevent the vehicle from sliding after the driver leaves. The service brake mainly reduces the speed or stops during driving. China’s relevant standards require the parking braking system of underground trackless rubber tyred vehicles to be inspected regularly to provide safety guarantee for underground operation. At present, the underground trackless rubber tyred vehicles can only be operated by driving them to the fixed Laboratory of the test center regularly (once a year). It is necessary to inspect the vehicle’s braking system and check whether the vehicle’s braking system is normal, Operation and production can only be carried out when it is determined that the vehicle is in good condition. The current inspection methods are not only related to the work efficiency of vehicle inspection, but also affect the safety of operators and production. In view of the above situation, the development of a set of advanced portable detection equipment for braking performance test of underground light trackless special rubber tyred vehicle is very necessary to improve vehicle inspection efficiency and ensure scientific detection.
Effect of concrete under continuous load on demoulding time during construction
Authors: Yang Weihan , Ma Ruowen , Xu Binghong , Cao Honghui , Zhang Mengmeng 
Published: June 2022

Abstract
Based on the current construction progress of each floor of the building, under the action of continuous construction load, the concrete strength at this time is only about 80% of that at the same age without load. It is suggested that when the test block maintained under the same conditions reaches 85% of the design strength, the whole structure is not easy to crack, which is not safe.
Comparative Analysis of German Dgnb and Chinese Green Building Evaluation Standards
Authors: Cao Chenyuan 
Published: June 2022

Abstract
With the concept of sustainable development being promoted all over the world, green building, as one of the necessary ways to achieve sustainable development, has been carried out by more and more countries, and a series of evaluation standards related to green building have been introduced. This paper makes a brief introduction and comparative analysis of some typical green building evaluation codes in the world. On the basis of the German DGNB algorithm on the full life cycle cost of green buildings, combined with the actual situation of China, this paper puts forward the algorithm of the full life cycle cost of green buildings suitable for China, and carries out analysis and verification, so as to provide reference for improving the evaluation criterion of green buildings in China.
Exploring Temporal Patterns of Urban Management Cases Based on Functional Principal Component Data Analysis
Authors: Cao Xinyue , Liu Fan 
Published: June 2022

Abstract
This paper indentifies temporal patterns of urban management cases (UMCs) to facilitate relevant administrations finding UMCs from passive to active in a timely and effective way by employing functional principal component analysis (FPCA). Finally, this work obtains temporal patterns of UMCs which are different variability modes of case time series globally, providing practical decision making supports to build up precaution against cases and efficiency quality of related administrations. Furthermore, this work will contribute to the development of Smart City with social harmony greatly. Besides, the study also enriches research in related fields and has a specific academic value.
Fire Characteristics Analysis of On-fire Intercity Train in the Tunnel under Open Side Door
Authors: Chen Zheng , Guo Chun , Zhao Wei 
Published: June 2022

Abstract
In order to explore the fire characteristics of high-speed intercity trains running in the tunnel when the side door of the carriage is opened in case of emergency, this paper simulates the fire intercity trains in the tunnel based on PyroSim fire simulation software, and studies the fire temperature and smoke distribution characteristics in the carriage of intercity trains at different running speeds and obtained: With the increase of train speed, the temperature and smoke concentration in the carriage gradually decrease, when the speed exceeds 140km/h, the temperature influence range and smoke concentration distribution are roughly the same. When the speed exceeds 80km/h, the concentration of combustion products began to decrease and reached the lowest at 200km/h. According to the distribution of train temperature and smoke and products concentration obtained by numerical simulation, it is suggested that the speed of intercity train with fire should maintain its original speed when the side door of the train is opened.