bluuebunny/crossref_metadata_2025_split huggingface dataset:
‘To be’ and its negation in Latvian
Authors: Petit Daniel 
Published: June 2023

Abstract
A striking peculiarity of the Baltic languages (Old Prussian, Lithuanian, Latvian) is the paradigm of the verb ‘to be’. Whereas Old Prussian, the only documented West Baltic language, still had an Indo-European-looking paradigm, Lithuanian and Latvian, the two members of East Baltic, have developed new forms for ‘to be’ and its negation. Most striking is the situation in Latvian, where the third person is ir ‘he is, they are’ (= Lithuanian yrà), but its negative nav ‘he is not, they are not’. The aim of this paper is to determine the origin of this suppletive relationship.
Words also exist in a world
Authors: Cappelle Bert 
Published: June 2023

Abstract
Clause sequences of the type ‘X’ does not exist – its correct name is ‘Y’ use descriptive negation in the first clause but also have something literally contradictory about them that is reminiscent of metalinguistic negation. I argue that the negative existential in such clause sequences exhibits a use-mention mix without blending descriptive and metalinguistic negation. The apparent contradiction can be resolved by acknowledging that words are not abstract labels lacking any substantial existence but also have a concrete reality in a ‘world of words’. Speakers often use the clause sequence studied here as a rhetorical device to point out that other speakers, for whom a word has currency, have a flawed view of the non-linguistic world.
Road potholes detection from MLS point clouds
Authors: Ma Xinjiang , Yue Dongjie , Li Siyuan , Cai Dongjian , Zhang Yi 
Published: June 2023

Abstract
The extraction of pavement damage information is one of the major difficulties in the application research of mobile laser scanning point cloud data. To address the problem of inaccurate detection results by using only relative distance to detect potholes, this paper proposes a novel pothole detection method that combines directed distance and skewed distribution. Firstly, the rapid positioning of the pothole is realized by the directed distance, which is calculated from the points and the local fitted plane. And monomerization and denoising of potential potholes are achieved by density clustering. Then, the new accurate plane is fitted by the surrounding pavement points of the potential pothole to obtain accurate directed distances. The negative skewed distribution of the directed distance histogram and the skewness coefficient are used for the accurate determination of the pothole. Finally, the three-dimensional geometric features of the pothole are extracted. Experiments were carried out on a road with poor road conditions. The experimental results validated the effectiveness and practicality of the proposed method. It can achieve automatic detection of potholes with different shapes and deformation degrees, and has effectively improved the efficiency of automatic road inspection.
Excellent ultraviolet optical limiting properties of Se nanosheets
Authors: Zhao Zhenyu , Du Binjian , Xin Yi , Ren Zihan , Xing Fei , Zhang Fang 
Published: June 2023

Abstract
Selenium (Se) is located in the fourth period of the periodic table in group VIA (element 34). In this experiment, three different solvents (isopropyl alcohol, N-methyl-2-pyrrolidone, and ethanol) were used to prepare the two-dimensional Se nanosheets, which were manufactured by the liquid phase exfoliation method with a thickness of 3.35–4.64 nm and a transverse scale of several hundred nanometers. The nonlinear absorption properties at 355, 532, and 1064 nm were studied using the open aperture Z-scan technique. Final results showed that Se nanosheets exhibited optical limiting (OL) effect in all three wavebands and three solvents, and had large two-photon absorption coefficients, especially in ultraviolet (UV) waveband. Which proved that Se nanosheets had great potential application as excellent OL materials in UV waveband. Our research broadens the path for the semiconductor field of Se, inspires the application of Se in nonlinear optics field.
Ordered exponential and its features in Yang–Mills effective action
Authors: Ivanov A V , Kharuk N V 
Published: June 2023

Abstract
In this paper, we discuss some non-trivial relations for ordered exponentials on smooth Riemannian manifolds. As an example of application, we study the dependence of the four-dimensional quantum Yang–Mills effective action on the special gauge transformation with respect to the background field. Also, we formulate some open questions about a structure of divergences for a special type of regularization in the presence of the background field formalism.
Experimental and Numerical Cracking Analysis of Precast Concrete Box Girder due to Tension
Authors: Li Jie , Zhou Lingyuan , Du Min , Wen Xiaxin , Zou Tongfei , Chen Congfei , Zhong Yingjie 
Published: June 2023

Abstract
The cracking problem of a precast beam of a highway in North China was investigated, and the field tests were carried out to test the stress in the cracking area during the prestress tensioning process. The distribution state of the main stress of the web and the influence of prestress tensioning on the stress concentration were obtained. A three-dimensional finite element model is also built to simulate the precast box girder, and the variation character of concrete stress with the tensioning procedure is simulated, which is compared with the test results. The results of both test and numerical analysis show that the principal tensile stress in the prestressed anchorage area and the web area near the diaphragm plate exceeds the tensile strength of the concrete. The test and numerical results predicted the correct direction of the observed crack preciously. Suggestions for reduce the principal tensile stress in the anchorage area are proposed.
An Analytical Calculation Method and Mechanical Response Laws of Buried Pipelines Subjected to the Impact of Transverse Landslides
Authors: Fan Zhiyong , Wu Bin , Liu Tianping , Zhao Ying , Liu Xiaoyu 
Published: June 2023

Abstract
When the buried gathering and transportation pipelines cross the landslide area transversally, the migration of the landslide mass can cause the pipelines to be subjected to lateral thrust, which can seriously affect the safe operation of the buried pipelines. In order to study the mechanical response laws of the buried pipelines under the impact of transverse landslides, based on the elastic-plastic foundation beam theory, the mechanical models of buried pipelines are established for three situations, and the analytical solution of pipeline displacement is obtained by genetic algorithm. The influences of landslide thrust, landslide width, soil resistance coefficient, the pipe outer diameter and wall thickness on pipeline peak displacement and peak stress are also investigated. The results show that under the impact of the transverse landslide, with the increase of landslide thrust, the maximum displacement and maximum tensile stress of pipeline increase exponentially, and the failure risk of pipe increases. Secondly, with the increase of landslide width, the maximum displacement of pipeline increases in the beginning and then decreases to be constant, and the maximum tensile stress decreases sharply to be constant. Thirdly, with the increase of soil resistance coefficient, the maximum displacement and maximum tensile stress of pipeline decrease in a negative power trend, and the pipeline is safer. Fourthly, when the pipe outer diameter increases to a certain value, the maximum displacement and maximum tensile stress of the pipeline change very little, hence, pipe outer diameter can be optimized when designing pipe structure. Fifthly, the smaller the pipe wall thickness is, the greater the maximum tensile stress of the pipe is, therefore, pipe corrosion protection should be paid attention to. Sixthly, when the landslide thrust is large, the landslide width is small, or the pipeline outer diameter is small, the maximum tensile stress of the pipeline is located at the centre of the landslide, otherwise, it is located at 0.56L ~ 0.7L away from the landslide centre. In order to ensure the safe operation of the pipeline, the stress state of these two positions should be focused on. It is concluded that the study can provide the basis for the evaluation of pipeline safety status and has practical significance for ensuring the safe operation of buried pipelines.
Research on Cost Control of Prefabricated Concrete Building Design Stage
Authors: Su Ying , Cai Jun , Zhang Jingdan , Qiu Xiuli , Jiang Deizhi 
Published: June 2023

Abstract
The industrialization of new building represented by prefabricated building is advancing rapidly. The design stage is the key stage of cost control of the whole prefabricated project. Through the analysis of the main design tasks in the design process of prefabricated concrete building design stage on the cost of prefabricated concrete frame structure, the factors affecting the cost control difficulties are analyzed, and the corresponding control measures in the design stage are put forward to promote the development of prefabricated concrete building. Through the comparison of cost control design and application cost of engineering cases in the design stage, it is shown that the construction cost of precast concrete frame structure system can be saved through reasonable design scheme.
New ALC panel wall installation quality control and reinforcement measures
Authors: Peng Yiqing 
Published: June 2023

Abstract
The rapid development of the construction industry has promoted the emergence of autoclaved aerated lightweight concrete slab wall (ALC panel wall) materials. This new type of building raw material has excellent use characteristics: its light weight, fire resistance sound insulation performance, environment protecting, economic, convenient construction and other advantages, so it has been widely used in the field of construction. For example, it can be used in all kinds of residential housing, apartments, office buildings, underground garages and other buildings in the wall enclosure construction, making the above-mentioned buildings with higher quality and practicality. In this paper, based on the analysis of the basic performance of ALC panel walls, the construction process, transport storage and technological innovation are combined to demonstrate the quality and anti-cracking control methods in the installation process of ALC panel walls, and the reinforcement measures to improve the construction efficiency of ALC panel walls, in view of the cracking and quality problems.
Analysis of the Temperature Effect and Influence of Large Span Continuous Rigid Bridge in Mountainous Area
Authors: Zeng Yuyang 
Published: June 2023

Abstract
The temperature problem of large span bridges in mountainous areas is particularly prominent due to the large temperature difference. This paper addresses the problem of ambient temperature influence on the construction and operation of large span prestressed reinforced concrete continuous rigid frame bridges. Through finite element modeling and computational analysis of an example of a continuous rigid frame bridge, the simulation results reveal the law of temperature influence on large span continuous rigid frame bridges and provide reference for the subsequent analysis of temperature problems of continuous rigid frame bridges. Based on the force analysis of the model, a series of bridge temperature crack generation mechanisms are proposed in combination with the bridge construction process and concrete characteristics, and reasonable treatment measures are proposed for the control of temperature cracks during bridge construction to ensure the overall quality effect of bridge construction and operation.
CFD Simulation of Vortex Induced Motion of a Caisson during Installation Process
Authors: Chen Jin , Chen Min , Liu Mingyue 
Published: June 2023

Abstract
This paper presents the CFD investigation of the vortex induced motion (VIM) of a caisson model during the installation process. The simulations were performed by solving the unsteady 3D Navier-Stokes equation. The Dynamic Fluid-Body Interaction (DFBI) tool is utilized to simulate the motions. Typical draft conditions of a caisson during installation process are considered. The present methodology is verified through the free decay and the VIM of a cylinder simulations in two-dimension. Free decay simulations show that the natural frequency decrease with the increasing draft of the caisson. Maximum response amplitudes occur in the range of 10<Vr
<13 for the draft Dp=0.1m. The resonance occurs when the crossflow response frequency f
y is very close to the natural frequency f
n. The inline/crossflow response frequency increases as the draft increases at the same reduced velocity V
r. The response frequency in the inline direction is double of that in the crossflow direction. Eight-shaped trajectories are observed. The maximum displacements in the crossflow direction increase as the drafts increase.
Motion Strategy of Drilling Anchor Manipulator Based on Intelligent Optimization Algorithm
Authors: Liming Che , Jun Zhang 
Published: June 2023

Abstract
The drilling and anchoring robot is an important equipment to realize the intellectualization of fully mechanized coal mining. The control effect of its manipulator directly affects the safety and efficiency of the support operation of the drilling and anchoring robot. The control of drilling anchor manipulator usually adopts PID controller, but due to the limitation of integer order PID control algorithm and traditional empirical parameter adjustment, it is difficult to find a group of parameters with the best control effect in a short time, resulting in the failure of timely and accurate positioning of the end of the manipulator. In this paper, the combination of numerical modeling and simulation analysis is used to adjust the parameters of fractional order PIλDμ
controller by using search algorithm (GPS) and applied to the motion control of manipulator; Based on the independent joint control theory, the single input single output system model of hydraulic cylinder at the joint of manipulator is established by using Matlab-Simulink software and fractional PIλDμ
control technology. The fractional order control system is regulated by input shaping feedforward control technology(IS). The step response effect of the hydraulic system is further analyzed by setting input feedforward controllers with different gain ratios. The numerical simulation results show that the control strategy of “Input Shaping(IS) + Intelligent optimization algorithm (GPS) parameter adjustment + Fractional PIλDμ
control technology” can effectively improve the spatial accurate positioning of mining manipulator. The research expand the application of intelligent control technology in the field of mining equipment.
Study on Noise Source Contribution of Converter Cabinet Based on Transfer Path Analysis Test
Authors: Fan Liuyang , Zhang Jian , Fan Yongxiang , Zhang Xiaowei , Li Qi 
Published: June 2023

Abstract
There are fan noise and transformer noise sources inside the converter cabin which may bring the environmental noise pollution through airborne or structural borne paths. In order to identify the contribution of each source and its path, transfer path analysis test was performed. Take full load working condition at full speed as an example, the contributions of fan air borne noise, fan structural borne noise, transformer air borne noise and transformer structural borne noise are 88.33%, 3.79%, 7.37% and 0.51% respectively. The contribution of air borne noise is 95.70% more than that of structural borne noise which is 4.30%. In the end the aerodynamic noise simulation of converter cabin is compared with the experimental result which is in good coincidence, this result can also verifies the noise source contribution result.
Analysis of Longitudinal Cracks of Casing in Heavy Oil Thermal Recovery Well
Authors: Cong Shen , Wang Bin , Song Enpeng , Cai Ke , Qu Tingting 
Published: June 2023

Abstract
This paper investigates cracking failure of the casing tube. There were longitudinal cracks in the heavy oil thermal recovery well occurred in an oil field. The fracture cause of casing was analyzed by macrographic observation, chemical composition analysis, mechanical property test, metallographic analysis, scanning electron microscope (SEM) and residual stress calculation. The results showed that the crack of the failed casing originates from the external surface of the pipe and has the characteristic of intergranular propagation. The fracture characteristics are brittle fracture. The conclusion showed that stress corrosion cracking(SCC) is the main cause of longitudinal crack of casing in the heavy oil thermal recovery well. Under the combined action of external corrosive media and internal stress, SCC cracks are generated on the surface of casing, and the cracks propagate along grain boundaries and finally lead to cracking and failure of casing. Some recommendations were proposed to avoid similar failures.
Effect of Cobalt Fraction Mixing WC Clads on Microstructural Evolution, Crack Formation and Tribological Properties by Laser Cladding
Authors: Zhang Chaoyang , Chen Shenyu , Yang Echo , Jean Mingder 
Published: June 2023

Abstract
In the present work, a ceramic-matrix composite coatings with different weight percentages of Co additive in the WC powders was studied on 45 steel by laser cladding. The effect of cobalt mixture with WC on mechanical properties such as microstructural evolution, hardness, wear and residual stress behavior of the coatings was carried out. The results show that high residual stresses induce significant cracking on 100% WC and that cracking activity is reduced by adding concentrations of 20% Cobalt to WC. Further, the microhardness of the coatings was more than five times higher than that of the substrate. The observation of the microstructural evolution reveals the fracture mechanism is a typical intergranular fracture in the molten zone and the crack propagates through the interior of the unmelted WC at 100% WC. Overall, the additive of high cobalt in WC did not result in a reduction of residual stresses due to less amount of brittle carbide. However, a reduced number of microstructural defects as well as a better wear behavior were obtained for the WC coated layers with suitably added Cobalt alloys.
Effect of Nano-Al2O3 on Properties of Alkali Activated GBFS Cementitious Materials
Authors: Zhou Xiaosheng , Zhang Yi , Jiao Xiaodong , Zhang Yangpeng 
Published: June 2023

Abstract
The effect of Nano-Al2O3 on the mechanical properties of alkali activated Granulated Blast Furnace Slag (GBFS) materials was studied. The results showed that the addition of Nano-Al2O3 can significantly increased the 28-day compressive strength. The compressive strength of the control slurry without GBFS just increased from 7.4 MPa to 8.5 MPa (14.86% increase) from 2 d to 28 d curing time, while as the addition dosage of Nano-Al2O3 increased from 1% to 5%, the compressive strength increase varied from 39.62% to 71.90% after 28d curing period. X-Ray Diffraction (XRD)-Retvieled combined with TG analysis showed that adding Nano-Al2O3 increased the amorphous phase, which may be the main cause of increasing of compressive strength.
Analysis of the Cause of Gas Pipeline Burst in a Gas Production Plant
Authors: Song Enpeng , Jin Quan , Ma Xin , Cai Ke 
Published: June 2023

Abstract
In order to reduce the failure of pipes, the macroscopic morphology, macroscopic crack, chemical composition, hardness, microstructure and so on were tested through the macroscopic analysis, physical and chemical property inspection, hydrogen-induced cracking test and sulfide stress cracking test. The SEM was used to analyze the microscopic cracks, fractures and element distribution at the failure site. The results show that the cracking zone of the failed pipe section has the characteristics of bulging deformation and thinning of wall thickness. The macroscopic fracture of the fracture is a typical 45° shear shape. The fracture was observed under the high magnification of scanning electron microscope and showed dimple morphology. The failure mode of the failed pipe segment is plastic fracture. The reason for the failure of this pipe is the special geographical location of this section of the pipeline, and the sudden increase of pipeline pressure after the well opening operation causes the water hammer phenomenon, which causes the local bulging of the pipe body, which further leads to burst failure.
A Wavelet-Multiple Swarm Genetic Algorithm for Cantilever Structure Damage Identification
Authors: Pan Xianwu , Guan Deqing , Kuang Jiaqi 
Published: June 2023

Abstract
A two-stage wavelet-multiple population genetic algorithm identification method is proposed to solve the problem of difficult damage detection of cantilever structures. The strain mode is then transformed into a wavelet using the Matlab toolbox, the structure’s damage location is examined using the wavelet singularity principle, and the displacement mode and frequency are then used to determine the degree of damage using a multiple population genetic algorithm (MPGA). When no damage information about the structure is available, this method can determine the damage’s location and extent. For example, numerical simulations and tests on a cantilevered beam demonstrate this method’s effectiveness.
Displacement Measurement of Urban Ramp Bridge Model Using Monocular High-Speed Camera
Authors: Jia Zhenkai , Liu Xianglei , Wang Runjie 
Published: June 2023

Abstract
Urban ramp bridge plays an important role in unblocking urban traffic and improving urban road network structure. Aiming at the limitations of traditional contact sensors in global measurement, this paper adopts non-contact, high frame rate, high-precision monocular high-speed video measurement technology to measure the dynamic response of the ramp bridge model loaded on the shaking table. The feasibility of video measurement in structure measurement is verified by comparing with the results of wire displacement meter, and the overall measurement accuracy is better than 0.1mm. The seismic effects of two different isolation bearings are compared and analyzed, and the test shows that the plate rubber bearing has a better damping effect.
Construction Technology of Mixed Support for Starting Section of Concrete Box Arch
Authors: Zeng Bin , Guo Jiping , Guo Fanbo 
Published: June 2023

Abstract
In the construction of the starting section of a concrete arch bridge spanning ravines or deep water, technical problems such as the inability to adopt full-stent construction, resulting in low construction efficiency. In response to this problem, this paper relies on the Shatuo Bridge in the deep-water area near cliff and proposes the use of a steel pipe support and a hybrid bracing technology to construct the starting section of the arch bridge, that is, using a steel pipe bracket near the arch foot. Cast-in-situ construction and horizontal force components are provided by diagonal cables and steel beams are embedded in the arch seats to balance the horizontal loads on the supports. The rest of the beam sections that cannot be erected with steel pipe supports are constructed by using inclined anchors. The practice shows that this technology successfully overcomes the limitation of the construction work space, and achieves the purpose of reducing costs and shortening the construction period. And the method can provide reference for the construction design of similar structures.