bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical modelling of RC floor slabs
Authors: Mikula J , Szolomicki J 
Published: September 2019

Abstract
The aim of the paper is to conduct a comparative analysis of four calculation models of reinforced concrete floor slabs, that differ in geometry and the way of supporting. The investigation focuses primarily on the analysis of deflections of cracked reinforced concrete slabs, while monitoring the degree of determined reinforcement and the width of crack opening. The used programs were analyzed in terms of their capabilities, necessary in the work of a modern construction engineer, such as modeling of concrete rheology, determining the real reinforcement, finite element mesh variation, taking into account changes in stiffness of the cracked section, etc. The computational methods used in the software were also taken into account, including the possibility of performing non-linear analysis (mainly in the case of material non-linearity), updating the stiffness matrix (inelastic method) or considering possible stiffening of the concrete under tension. Each model was calculated taking into account the influence of shrinkage and without analyzing it, that required additional analysis of the ways of modeling rheology of concrete with use of computer programs.
Study of natural gas pipeline behaviour
Authors: Radermacher L , Mateescu T 
Published: September 2019

Abstract
In order to prevent incidents due to uncontrolled gas leakage and explosion/fires were devastating look at the factors that determine the safety in operation of gas networks made of polyethylene. Sustainability and safety in operation, lines of distribution networks and installations for use in natural gas represents a complex issue with implications for economic, social and environmental. Underground natural gas pipes are subjected to a series of prompts both static and dynamic which could lead to. damage. The complexity of the problems stemming from the diversity of stress factors acting on the related pipelines supply natural gas.
In this context, the authors analyse the behaviour of pipelines under the effect of the stresses to which they are subject by using finite element modelling.
Thermal comfort assessment for different heating system using CFD-modelling inside of an orthodox church
Authors: Ciocan V , Țurcanu E F , Verdeș M , Luciu R S , Bălan M C , Hudișteanu S V , Burlacu A 
Published: September 2019

Abstract
Thermal comfort is a general term that describes the sensation of warm or cold for the occupant, defining the state of mind of humans that expresses satisfaction. Because 90% of our time is spend inside the buildings is essential to achieve a good thermal comfort. In this paper we present two different heating system that are used in more than 90% of the church in our country. The article test two different heating system in order to evaluate the thermal comfort of the occupants and if the climate meet the requirements for the churches where the paints and the artworks must be kept in good condition for future generation.
Improved strategy for optimal control of Civil Engineering structures
Authors: Păuleț-Crăiniceanu F , Luca S G , Pastia C , Florea V 
Published: September 2019

Abstract
Inside the Industrial Revolution 4.0, the concepts as Smart Cities and Smart Society are important parts in protection of humans against natural disasters, as strong earthquakes. Older or newer protection strategies of Civil Engineering structures (bridges, buildings) must be updated with elements of the actual technological revolution as sensors, drones, robots, nanotechnologies, AI, big data, cloud computing and so on. This paper is focused on a optimal structural active control of buildings started by many researchers during the last decades. Now, the target is to improve an optimal strategy developed by authors by proposing a more efficient use of computation. The success of this strategy leads to a faster response of computers that direct the control devices. This provides the ground for a larger range of control devices based on a larger number of sensors and, therefore, a better energy use together with a more precise anti-seismic structural protection
Enhancing Civil Engineering teaching through 3D Computer Aided Design
Authors: Gonçalves J , Santos B 
Published: September 2019

Abstract
3D interpretation of 2D drawing is not easy for most of the Civil Engineering first-year students. Some do it naturally but most need to be trained to master this skill. In this paper, the implemented teaching methodologies aiming to facilitate the acquisition of three-dimensional project visualization skills are presented. These methodologies were developed during the last two years targeting first-year Civil Engineering students at the University of Beira Interior (Portugal). After a first contact with 2D project representation through manual drawing, students progressively elaborate computer-aided design (CAD) project starting with simple 2D drawings and culminating with a 3D project of a pre-existing building. Students are also motivated to improve their 3D graphic representation skills through a classroom contest where the winning project is printed in 3D. The training in 2D and 3D graphic representation is complemented during the second year with several in situ surveys and computer-aided drawing of topographic data. This approach proved to be very interesting for competence acquisition, qualifying students for a better 3D representation and interpretation. Students also found this methodology to be motivating.
Experimental research on behavior of axially circular CFRP steel tubular confined recycled aggregate concrete long columns
Authors: Zhang G W , Wang Z L , Liu D W 
Published: September 2019

Abstract
In order to reveal the mechanical properties of CFRP recycled aggregate concrete long columns under axial compression load, we designed 7 experimental members for the test. The specimens parameters are recycled coarse aggregate replacement percentage, slenderness ratio and layers of CFRP jackets. According to the test, the failure process and patterns were obtained, and the curve of load-displacement were measured. The influence of recycled coarse aggregate replacement ratio, slenderness ratio, layers of CFRP on the bearing performance of CFRP circular steel tubular confined recycled aggregate concrete long columns were analysed.
Research progress on bolting connection of prefabricated concrete shear wall
Authors: Xiao Tongliang , Sheng Jiacheng , Chen Yan , Chen Biyong 
Published: September 2019

Abstract
Dry connection of prefabricated concrete shear wall has gradually become a hot research direction in China, and among those various of dry connections, bolted joints attract scholars’ attentions with its unique advantages. This paper introduces the classifications of bolted joints of prefabricated concrete shear wall structures. Then it summarizes the latest developments of such joints in foreign countries, and the current research status in China. At the same time, this paper will give a comprehensive evaluation from the perspective of safety and cost. Finally, some suggestions are put forward for the problems still to be solved in this direction in the future.
Variations of Enzymatic Activity and Main Quality Components During the Fermentation Process of Acanthopanax senticosus Tea
Authors: Wu K W , Xu Q Y , Zhu L J , Yang L N , Ma T 
Published: September 2019

Abstract

Acanthopanax senticosus fresh leaf was used as the experimental material to produce tea, Eurotium cristatum was used to ferment the Acanthopanax sentieosus tea. The variations of main quality components and enzymatic activity were examined during the fermentation process. The results showed that tea polyphenols, amino acid, and soluble sugar were decreased from 16.36%, 4.33%, 1.96% to 5.42%, 1.34%, 0.88%. The theabrownin was increased from 14.0% to 16.61%, but theaflavins and thearubigins were increased and then decreased during the fermentation process of Acanthopanax sentieosus tea. In addition, cellulase, pectinase and protease had been there as the endogenous enzyme before generating microorganisms, while polyphenol oxidase were exogenous enzymes. The main quality components and enzymatic activity were changed obviously as the time was prolonged. The quality of Acanthopanax sentieosus tea was improved effectively, which provided theoretical basis for the production and application of fermented-tea of Acanthopanax senticosus.
Microwave activation of coal gangue for Al compound
Authors: Lan Xijie , Liu Shuhong , Jing Yuan 
Published: September 2019

Abstract
The coal gangue was activated by microwave. From the results of XRD and 27AlMAS NMR, we can speculate the reactions occurred and new species were generated during the microwave activation process. Effects on power grades of microwave oven, kinds of additives, time of microwave activation, temperatures of water bath and ratio of coal gangue to additives were investigated. Much higher extraction percent of Al (>50) has been obtained with KOH as additive, ratio of coal gangue to additive is 1:2, power of microwave oven is 595W and time of microwave activation is 20 min.
Recipe Optimization to Produce Functional Anti-Motion Sickness Compressed Biscuits
Authors: Luo Lei-Lei , Wu Jun , Cao Li-Li , Zhai Cheng-Gong , Wu Xue-Feng , Luo Min 
Published: September 2019

Abstract
Anti-motion sickness, especially the seasickness, as one of the most common seen symptoms in long-term journey, can affect the normal work and life of crew members seriously. The purpose of this study is to investigate the anti-seasickness, anti-fatigue and functional constipation improving effects of anti-motion sickness biscuits in mouse model. Behavioral experiments together with biochemical indicators of mice were investigated under different doses of compressed biscuits. Results of the study indicate that mice fed with compressed biscuits containing medium and high doses of the anti-motion sickness ingredient can significantly improve the learning, memory and swimming ability compared to the control group. Furthermore, glycogen, LA and LDH levels of the mice can be increased with decreased BUN and Passe levels under the treatment of anti-motion sickness compressed biscuits. The results suggest that the compressed biscuits have anti-seasickness and anti-fatigue effects. In addition, the impact of pear residue in the compressed biscuits on the functional constipation of mice was also discussed in this paper.
Fabrication and characterization of novel polyacrylate films with hindered phenol structures and fluorine groups
Authors: Lou Jingjie , Zhang Yingqiang , Zhao Peng , Xu Wei , Fan Sida , Wang Xinyu 
Published: September 2019

Abstract
A series of novel fluorinated-damping polyacrylate (OFDA) emulsions based on a series of novel hindered phenol fluorinated acrylates (OFIP-AO 1010-HEA) were prepared successfully. The structure of OFIP-AO 1010-HEA was characterized by fourier transform infrared spectroscopy (FTIR). The influence of OFIP-AO 1010-HEA on different properties of the OFDA films was investigated by using dynamic mechanical analysis (DMA) and the measurement of contact angle. The results showed that the OFDA6 film owns 0.75 in tan δpeak and its loss factors ≥ 0.3 was spanning widely from -80 °C to 200 °C. So the OFDA6 film had the best damping properties. While OFDA4 had the best in the contact angle of water and the lowest surface free energy.
The Effect of Calcium Leaching on the Chloride Diffusivity of Hydrated Tricalcium Silicate Pastes
Authors: Tao Guanghui , Liu Lin , Qin Gang , Xu Xiaquan 
Published: September 2019

Abstract
Calcium leaching of cement-based materials induces detrimental effects on diffusion properties related to long-term durability. This paper investigates the effect of calcium leaching on the chloride diffusivity of hydrated tricalcium silicate (C3S) pastes. Different concentrations of ammonium nitrate solutions were used to accelerate the calcium leaching of C3S pastes. The degree of alternation of C3S pastes was characterized by Ca/Si. The chloride diffusivity of the leached C3S pastes was obtained by the steady-state electro-migration test. Results show that the chloride diffusivity of the leached C3S pastes increases with the increasing degree of alteration. Compared with the sound C3S pastes, the diffusivity of the leached C3S pastes is increased 1.8-3.6 times depending on the degree of alteration.
Preparation and Properties of Needle-punched Woven Quartz Fiber Reinforced SiO2 Ceramic Matrix Composites
Authors: Su Tong , Luan Qiang , Wei Qihong , Wang Hongsheng , Liu Xiaojun , Shi Jiang , Gao Wenqiu , Shao Changtao , Wang Yuhong 
Published: September 2019

Abstract
The needle-punched woven silica fiber reinforced SiO2 ceramic matrix composites were prepared by liquid phase infiltration-in-situ solidification molding process. The prepared composites have high density and good uniformity, and the mechanical properties of the composites at room temperature. Microstructure, interfacial properties and dielectric properties at room temperature were investigated, and the strengthening and toughening mechanism of acupuncture-woven quartz fiber reinforced SiO2 ceramic matrix composites was discussed. The mechanical properties at room temperature show that the tensile strength, flexural strength, compressive strength and interlaminar shear strength of the composites reach 35.6MPa, 79.0MPa, 122.0MPa, 11.9MPa, respectively. Scanning electron microscopy (SEM) and energy spectrum of the fractures of the samples (EDS) observation and analysis showed that there was no interfacial reaction between the matrix and the fiber, and the interface was suitable. The main factors that improve the mechanical properties of composite materials at room temperature are crack steering, expansion barriers, and fiber pull-out. The dielectric properties of the composite at room temperature do not change or change much under different X, Ka, and Ku conditions. As the bulk density increases, the dielectric constant of the composite increases gradually, and the loss tangent is always maintained at 10-3 orders of magnitude.
Synthesis and Application of Hydrogenated Cardanol Polyoxyethylene Ether
Authors: Chen Feng , Chen Pengfei , Jiang Wenhe 
Published: September 2019

Abstract
Unsaturated cashew phenol polyoxyethylene ether (UCPE-11, UCPE-13) was synthesized from cashew phenol by ethylene oxide addition reaction, and then hydrogenation was catalyzed at room temperature and pressure to produce saturated cashew phenol polyoxyethylene ether nonionic surfactants (CPE-11, CPE-13). The effects of catalyst dosage and reaction time on catalytic hydrogenation reaction were investigated. The optimum conditions for catalytic hydrogenation reaction were determined as follows: Al-Ni alloy was selected as catalyst at 25 °C, the dosage of which was 18% and 27.8% of the mass of unsaturated cashew phenol polyoxyethylene ether, respectively, and the reaction time was 11 h and 12 h. The structure of the product was characterized by IR and 1H NMR. The synthetic product was used in AC aluminium cleaner. The results show that the product has excellent decontamination performance. The surface of the washed aluminum parts is clean and has a metallic luster, and the washing effect is good.
Preparation of dense ZIF-67 layer wrapping PPy nanotubes via assistance with triethylamine
Authors: Liu Xiu-Feng , Li Yong-Jian , Li Han-Sheng , Wu Qin 
Published: September 2019

Abstract
The high dispersity and conductivity of materials are of great significance in the field of energy conversion and storage. In this work, a highly dispersed ZIF-67 anchored onto polypyrrole nanotubes precursor with good crystalline is prepared via self-assembly through coordination between cobalt cation and 2-methylimidazole assisted with deprotonating agent of triethylamine. The as-synthesized precursor displays a dense coating layer wrapping high aspect ratio polypyrrole nanotubes as clearly observed by scanning electron microscope. This work provides a rational route in construction of hierarchical composites with high conductivity and outstanding catalytic property applied in electrocatalysis and energy storage device.
Effect of joint characteristics on surrounding rock stability and stress mechanism of bolt under blasting excavation
Authors: Liu Xue-Zeng , Lai Hao-Ran , Sang Yun-Long , Zhu Wen-Xuan 
Published: September 2019

Abstract
Joint characteristics of rock mass are the key factors of tunnel surrounding rock failure. This paper relies on the two-lane mountain tunnel project and takes the IV class surrounding rock as the research object. By means of on-site investigation, numerical simulation and on-site monitoring, the effects of different joint development characteristics under blasting vibration on tunnel surrounding rock deformation, instability mode and force mechanism of rock bolts are studied. It is found that the instability mode of tunnel is obviously affected by the larger joint dip angles. When the dip angle of one group of consecutive joints is kept unchanged and the dip angle of another group of joints is changed, the vault settlement decreases first and then increases with the increase of joint dip angles. The influence of horizontal joint spacing on surrounding rock deformation and vault settlement is much greater than that of vertical joint. Under the most disadvantageous working conditions of the two sets of consecutive joints, the effective range of the axial force of rock bolts depends on joint dip angles and has little correlation with joint spacing. The axial force of rock bolts decreases with the increase of horizontal joint spacing, while the influence of vertical joint spacing on bolt is less.
Application Research of Liquid Viscous Damper in Controllable Structure
Authors: Zheng Wei 
Published: September 2019

Abstract
The controllable structure assembling the additional liquid viscous damper shows good structural characteristics through theoretical analysis and the comparison with model test. Liquid viscous dampers can significantly change the basic dynamic characteristics of the structure and exhibit certain regularity. According to the research, the ability of the structure assembling damper to adjust itself is greater than the effect of same structure adding weight, which indicates that the liquid viscous damper plays a prominent role in controlling the structural response.
The Development of Manufacturing Technology of CVD Diamond Thick Film Tools
Authors: Shi Haohao , Chen Feng , Zhou Yidan 
Published: September 2019

Abstract
The key manufacturing technology of CVD diamond thick film tools is introduced, including thick film preparation, cutting, welding and edge polishing. The problems existing in manufacturing of CVD diamond thick film tools are analysed. The development trends of manufacturing technology of CVD diamond thick film tools are discussed.
Modeling, Simulation and Experimental study on Giant Magnetostrictive Pump-Hydraulic System
Authors: Zhao Yapeng , Zhang Xuyao , Lu Quanguo 
Published: September 2019

Abstract
In recent years, there have been growing attention for hydraulic actuators with smart materials. In this paper, a new type of giant magnetostrictive pump structure was designed and the experimental framework of giant magnetostrictive pump-hydraulic drive system was proposed. The dynamic model of giant magnetostrictive pump-hydraulic drive system was constructed. Thus, the output speed of output cylinder in this system under different preload was simulated and experimental study was carried out under the same conditions. The experimental results verified efficiency of the dynamic model to a large extent.
The Technology Research on Cutting Test of 4GXJ-I Tapping Knife for Rubber Tree
Authors: Huang Chang , Wang Lingling , Cao Jianhua , Zheng Yong , Wu Sihao 
Published: September 2019

Abstract
As the market continues slumps and an aging rubber-cutting contingent, rubber-cutting labor shortage has become one of the bottlenecks restricting the development of caoutchouc industry. The mechanical and intelligent cutting method becomes the development direction in rubber-cutting industy. This study choses type 4GXJ-1 of portable cordless brushless tapping knife to take rubber-cutting experiment in accordance with appropriate rubber-cutting procedures. The results show that the bark cutting technology can research millimeter in precision control, and the rubber-cutting average time can achieve the projected objective. The results have been validated by the test, and it can provide the references for the other similar design. The type 4GXJ-1 of portable cordless brushless tapping knife is practical and worthy of wide application.
Iterated Local Search Algorithm for single and double runway aircraft scheduling problems in Terminal Area
Authors: Xu Hongyun , OuYang Quan 
Published: September 2019

Abstract
We present an Iterated Local Search (ILS) algorithm for solving the single and double runway aircraft scheduling problems in terminal area. The main ideas and implementation methods of each step are described in detail. Applying the ILS algorithm to solve the instance used in the literature and compare the results of ILS with those of previous 4 algorithms. For the single runway problem, the ILS can find the previous best known result. For the double runway problem, the ILS can find a result better than the previous best known result.
Crawling Gait Planning and Simulation Analysis of Closed-chain Walking Leg Robot
Authors: Wang Yongming , Wei Qiang , Ma Tengfei 
Published: September 2019

Abstract
This paper presents a new type of closed-chain walking leg mechanism, which can swing through a crank-rocker mechanism, and a crank-slider mechanism to achieve leg extension. On this basis, a quadruped robot is constructed, the crawling gait planning is carried out, and the leg swinging time sequence of the robot crawling is given. Based on ADAMS simulation software, the virtual prototype model of quadruped robot is established, and the relative simulation parameters are set up to simulate the robot motion. The displacement curve and velocity curve of the body centroid and foot end of the quadruped robot are obtained. The simulation results show that the quadruped robot can walk stably in the crawling gait.
Study of the property of High Viscosity Asphalt Used in Permeable Friction Course
Authors: Zhu Siyue , Qin Xiantao 
Published: September 2019

Abstract
In order to evaluate the property of self-modified high viscosity asphalt (SHVA), we use GC SBS modified asphalt (GC)and TPS high viscosity asphalt (TPS) as control group. The rolling thin film oven test (RTFOT) and pressure aging vessel (PAV) were adopted to evaluate the aging property of high viscosity asphalts. And the storage stability of SHVA was measured. The results show that after RTFOT, the ductility, zero shear viscosity, viscosity toughness and toughness of SHVA are better than those of GC and TPS. The Zero shear viscosity of SHVA can still reach 19638Pa·s after PAV. Therefore, the anti-aging performance of SHVA is better than GC and TPS. After heat storage for 72h, the softening point difference of SHVA is 2.3 °C which can meet the storage stability requirement.
Metal-doped carbon aerogel from sodium alginate for supercapacitor
Authors: Zhai Zuozhao , Ren Bin , Xu Yuelong , Liu Zhenfa 
Published: September 2019

Abstract
In this paper, different metal-doped carbon aerogels are prepared by one-step carbonization with sodium alginate as raw material. It was known by SEM and TEM that the metal was uniformly dispersed into the carbon aerogels. Cr-doped carbon aerogel has a rich pore structure with a specific surface area of up to 497.4 m2 g-1. The prepared samples were used in the field of supercapacitors, and the test results showed that the Cr-doped carbon aerogel has the highest specific capacitance (312.5 F g-1).This study not only develops new directions for the utilization of marine biomass resources, but also provides a simple method for preparing metal-doped carbon material.