bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study regarding the stiffness influence of slab to beams for a plan structural reinforced concrete frame system in seismic zones
Authors: Sococol I , Mihai P , Iftode V I , Olteanu-Dontov I 
Published: September 2019

Abstract
For monolithic reinforced concrete structures, it is known that beams and slabs form a common body, so that the stiffness of the dissipative elements (beams) increases significantly. Also, it is known the fact that the beams are the principal structural dissipative elements. In these circumstances, it will try through numerical simulations (nonlinear calculation) a theoretical reproduction of a recently executed structure, so as to take into consideration the effect of excess rigidity brought to the horizontal dissipative structural elements (beams). It will be pursued the dissipation mode of seismic energy through plastic deformations (formation the punctual plastic hinges at the end zones of the beams and especially at the end regions of the columns).
The influence of construction and service stages on the internal forces of prestressed precast beams
Authors: Stan I L , Florea N , Mihai P , Tănăsucă V C 
Published: September 2019

Abstract
The accurate design of prestressed precast beams is correlated with the proper evaluation of construction and service stages. On usually are considered the following construction stages: casting, transfer of prestressing, storage time, transport and mounting stage. In the presented paper, it will be illustrated the stress development on the beams by altering the specific times between different construction and service stages as a result of using different construction technologies as well as a consequence by imposing in advance different requirements during the design phase. To highlight these particularities IDEA StatiCA software was used, and a comparison between various cases is presented.
Design of a high-rise building with hybrid steel-concrete structural elements
Authors: Venghiac V-M , Budescu M , Băetu S-A 
Published: September 2019

AbstractThis paper presents the challenges encountered during the structural design of a high-rise building located in a seismic area. The construction is an office building, it has 20 stories including the basement levels and a narrow base. Some of the challenges are: providing an accurate structural system to resist the wind and earthquake actions and to design a proper foundation to avoid the overturning of the entire structure. Another important aspect is to limit the stories drift but at the same time provide an open space for the office area. Hybrid structures do not behave like reinforced concrete structures in the sense of Eurocode 2 nor like composite structures in the sense of Eurocode 4. For this reason and due to the lack of knowledge related to the problem of force transmission between steel and concrete the design of structures with hybrid steel-concrete elements can become very difficult. Several models are analysed comparing structural systems made of reinforced concrete, ones made of hybrid steel-concrete elements and several other types of systems.
Finite element modelling of different strengthening strategies for reinforced concrete deep beams
Authors: Gergely V , Pop M , Campian C , Chira N 
Published: September 2019

Abstract
The paper is focused on the behavior of deep beams retrofitted with FRP sheets and layers In order to understand the behavior of these beams, and an advanced nonlinear finite element model is used. The nonlinear analyses were performed based on the Modified Compression Field Theory which is a smeared rotating crack approach implemented in program VecTor2. The predictions of the finite element models were compared to the test results in order to validate the models and to further understand the behavior of the test specimens. Finally, the validated model was used to perform parametrical studies to investigate the effect of FRP sheets and UHPFRC layers on the behavior of true-scale deep beams. The variables investigated in a systematic manner included the aspect ratio of the member, the layout of the FRP sheets, the thickness and fiber content of the UHPFRC layers. The results were used to compare the effectiveness of the two retrofitting techniques.
Nonlinear FEM analysis of steel beam-to-column connections with extended end plate
Authors: Stașcov M , Venghiac V M , Luca S G 
Published: September 2019

Abstract
Even if it has been shown that steel beam-to-column connections with extended end plate has a semi-continuous behaviour, many structural analyses consider these joints either fixed or pinned. For advanced structural analysis of connections and frames it is necessary to know the behaviour of the joint. The characteristics of the joint can be identified on the moment-rotation curve. This paper presents a comparative study of the moment-rotation curve for a standardized node calculated according Eurocode 3, and obtained by FEM analysis using IDEASTATICA and ANSYS finite element analysis program. The analyses were performed for the models with non pre-tensioned bolts. Also, an additional study was performed in ANSYS to identify the influence of the thickness of the extended end plate.
Evaluation of the thermal performance of composite insulated panels with metallic skin through steady-state numerical analysis – Part 2
Authors: Măgurean A M 
Published: September 2019

Abstract
Although the constructive detail type approach analysis already offers an extensive image about the influence of thermal bridges that occurs in the composite insulated panels with metallic skin, studies of the subject go further, by integrating the detail obtained results into parts of the building analyses, with the purpose to identify how factors such as occurrence frequency of the thermal bridge, or the percent of the glazed surfaces existent in regular facades influence the thermal behaviour of the building part, along with the numerical value of the linear thermal transfer coefficients obtained in Part 1 of the paper. Also, for the identified constructive detail with the lowest thermal performance, framework solutions were identified and analysed through steady-state FEM analysis in order to offer a working tool for building energy auditors.
Numerical analysis of heat exchanger with uniform heat flux used in heat pumps systems
Authors: Popovici C G , Hudișteanu S V 
Published: September 2019

Abstract
The paper presents a numerical analysis of an innovative heat exchanger with uniform heat flux, integrated as a cold source, for heating and air-conditioning systems which are equipped with heat pumps. The ground-water or water-water surface heat exchanger type is modelled, having variable geometry, uniform efficiency and heat flux along the system. The purpose of the work is to analyse a heat exchanger with uniform thermal flux, in order to offer an alternative to actual technical solutions using polyethylene pipes mounted in parallel on horizontal or vertical drilling. For typical geothermal heat exchangers, both the surface and the depth are characterized by non-uniform exploitation of the soil. The uniformity of the thermal load of the earth mass can be an energy efficiency solution in terms of optimizing the storage capacity and consequently the reduction of the land used, respectively the length of the drilling needed for mounting the source. The analysed heat exchanger with uniform thermal flux, designed to achieve low or medium sources of thermal energy, offers an efficient energy consumption, being environmentally friendly and has a reduced relative cost. It can be an attractive alternative for the residential buildings or Nearly Zero-Energy Buildings (NZBE).
Comparative analysis of heating systems used in Orthodox churches
Authors: Hudișteanu S V , Ciocan V , Verdeș M , Cherecheș N C , Bălan M C , Țurcanu E F 
Published: September 2019

Abstract
This work displays a numerical examination of the improvement of indoor atmosphere conditions inside an Orthodox church of Iasi. The objective consists in proposing a solution for reducing the risk of condensation for the case of the real heating system with hot air, used in Three Holy Hierarchs Monastery of Iasi. The solution was to use the local ventilation at towers, that generates air flow in these zones and evacuate humidity. This configuration was tested numerically and the results highlighted its effects. For comparison, the local ventilation was studied for two other heating solutions that are largely used in this type of buildings, underfloor heating and static heaters. The simulations demonstrated that the local ventilation represents a suitable solution when it is combined with the hot air heating.
Microclimate analysis in Gheorghe Asachi auditorium: showcase for the indoor climate performance
Authors: Verdeș M , Ciocan V , Țurcanu E F , Luciu R S , Bălan M C , Hudișteanu S V , Burlacu A 
Published: September 2019

Abstract
The subject of this paper is to the study the microclimate inside a heritage building. The Gheorghe Asachi Auditorium is one of most important building in the university and in the history of Jassy. Build in 1897, it was inaugurated by King Carol I. The auditorium serves as meeting place and manifestations for different occasions. Auditorium is built in baroque style with multiple paintings, artworks and wooden elements sensitive to moisture and temperature variations. CFD analysis is the proper tool for understanding the phenomena’s regarding the movement of large volume of warm and moisture air. The analysis allowed us to make some recommendations to the conservation of such historical place but with regard to main human comfort.
The effect of wave crest speed in breaking waves
Authors: Craciunescu C C , Christou M 
Published: September 2019

Abstract
The present work focuses on the evolution of the crest speed around large focal type water wave events. The phenomenon of crest slowdown around the point of maximum elevation is studied numerically using a boundary element model. The model is used to generate large design waves based on realistic ocean spectra. The evolution in terms of coupling between crest speed reduction and increase in particle velocities is studied up until initiation of wave breaking. It is shown that this coupling is a viable mechanism that leads to the formation of large deep water unidirectional breaking waves regardless of spectral shape and bandwidth.
IR thermography applied in church heritage conservation
Authors: Țurcanu E F , Ciocan V , Verdeș M , Luciu R S , Bălan M C , Hudișteanu S V , Burlacu A 
Published: September 2019

Abstract
IRT – infrared thermography has met an extensive popularity among the non-destructive technologies. This paper is presenting some of the monumental church that had been examine with thermovision camera in order to assess the behavior of structure to ageing, earthquake damages, detect hidden characteristics or order anomalies. IRT investigation is based on principle that heat flowing in a material is altered by presence of all kind of anomalies, our job been to discover and interpreting. Thus heat bridges can be detected, heat loses and air leakage can be identify or the presence of mold, moisture is growing in a particular area.
Pass design and thermal analysis of high thermal resistance multi-row sintered bricks
Authors: Jiang W , Liu D , Yang Z H 
Published: September 2019

Abstract
In the thermal analysis, a numerical calculation method to verify the steady heat transfer coefficient of multi-row bricks was obtained. The effects of thermal conductivity, the number of rows and holes, the ratio of transverse wall area to wall rib area were analyzed with a view to finishing the optimal pass design for the 240 thick high thermal resistance of multi-row bricks. And the influence laws of heat transfer change of multi-row bricks were probed both in the steady state and unsteady state.
Stress Simulation Study on a Novel Combination String of Transmission Line Insulators
Authors: Wang Dapeng , Xie Tao , Yuan Zuhui , Niu Jingping , Xia Wei , Bao Yang 
Published: September 2019

Abstract
The insulator string mainly plays a role of fixing wire and preventing the current from returning to the ground in the power transmission and transformation project. In order to compress the corridor width of the transmission line and make it convenient for breaking line, we proposed a novel structure in which the V-type fittings and the tensile insulator string are optimally combined. In this paper, the mathematical model of mechanical analysis for the structure is established. According to the equilibrium conditions of space force system, the factors affecting the stress of the structure are analysed. In addition, a simulation model is built in the finite element analysis software. The stress distributions of the new structure by setting two installation angles are calculated and the special parts with weak mechanical properties in the new structure are explored based on the generated stress cloud diagram. We compare the maximum value of the von Mises equivalent stress in the two arrangements. A conclusion of better than 45° at a mounting arrangement angle of 50° was obtained. The research results provide a theoretical reference for further optimization design and installation of the combined structure in the future.
Analysis of gravity heat pipe for anti-icing and snow melting on road surface
Authors: Qing Qian , Zhang Deng-Chun , Chen Da-Wei 
Published: September 2019

Abstract
Road icing is a serious hazard to highway traffic safety, so it is necessary to develop the anti-icing and de-icing technology. In this paper, theoretical and simulation analysis was carried out based on the idea that the gravity heat pipe uses shallow geothermal energy to meet the requirements of highway de-icing. The maximum heat transfer limit of different working media was calculated, and the two-dimensional pavement heat transfer model and thermal resistance model were established. The effect of different pipe diameters, pipe spacing and length of evaporation and condensation section on the heat transfer efficiency of gravity heat pipe to the surface of road was considered. It is concluded that ammonia can maximize the heat transfer limit of heat pipe due to its high latent heat, which is the best working fluid for preventing ice and snow melting of gravity heat pipe. When the pipe spacing is 150mm, the road surface temperature can be more than 2 °C. Considering the maximum heat transfer per unit area, the optimal length of the gravity heat pipe is 30m for the evaporation section and 10m for the condensation section, and the unit heat transfer is 205W/m2.
Rapid supercritical fluid chromatography analysis for 18 phthalate esters and bisphenol A in dairy products
Authors: Qiu Yue , Xia Zhining , Li Genrong , Yu Qiuling , Lu Jiali , Li Yanfei 
Published: September 2019

Abstract
A rapid and environmental method based on supercritical fluid chromatography (SFC) was established for the simultaneous analysis of 18 phthalate esters (PAEs) and bisphenol A (BPA) in dairy products. The stationary phases, organic modifiers, back pressures and column temperatures were investigated for the optimal separation. The BEH chromatographic column (100 mm x 3.0 mm, 1.7 mm) with sub-2-micron particles was performed for the detection of target compounds. 18 PAEs and BPA can be effectively separated within 5.5 min with acetonitrile as solvent modifier at the optimal conditions. The correlation coefficients (R2) of 18 PAEs and BPA were more than 0.997 in the linear range of 0.3-10.0 mg/L, except for BMPP, DNOP and BPA in the range of 0.6-10.0 mg/L. The limits of quantification (LOQs) for PAEs and BPA were 0.15-0.60 mg/kg. The spiked recoveries and relative standard deviation (RSDs) were in the range of 88.2-120.5% and 1.55-13.51% for powdered milk infant formula samples, 89.6-114.2% and 0.69-10.06% for milk drinks samples, respectively. The SFC method can be used as a simple and efficient alternative route for the detection of 18 PAEs and BPA in dairy products.
Fabrication of superhydrophobic Fe2O3/Fe3O4 composite surface on N80 substrate
Authors: He S J , Cao X F , Hu J 
Published: September 2019

Abstract
Fe2O3/Fe3O4 composited film with micro-nano structures is prepared on the surface of N80 steel. The Fe2O3/Fe3O4 composited film after modification with stearic acid shows great superhydrophobicity with a water contact angle of 157.3° and sliding angle of 8.1°. Furthermore, the superhydrophobic Fe2O3/Fe3O4 composited film can keep anti-wettability when it is immersed in the water and make water droplets keep sphere on it. Furthermore, the superhydrophobic surface also shows excellent self-cleaning property. Our work finds that annealing in the atmosphere after egg white burning can produce nanoneedle structures perpendicular to the micro-octahedron, which plays a significant role to make micro-nano hierarchical structures for Fe2O3/Fe3O4 composite film.
Physical Properties of [BPy] [L-Pro] Chiral Ionic Liquids with Asymmetric Catalytic Performance
Authors: Chen Shiyu , Wu Cong , Li Ruoheng , Yao Shun , Huang Wencai , Song Hang 
Published: September 2019

Abstract
A pyridine-containing chiral ionic liquid [BPy][L-Pro] with an amino acid as the anion was synthesized, and its synthesis process is very simple with 86.6% yield and 97% purity. Some important physical properties including specific rotation, refractive index, conductivity and density of [BPy][L-Pro] have been comprehensively determined. The dependence of main properties of the [BPy][L-Pro] aqueous solution at different concentrations and temperatures was also explored and fitted, which can provide useful information for its asymmetric catalytic application.
Studies of Poly(L-lactic acid) Composites: Influence of 1H-Benzotriazole on Thermal and Mechanical Performance in Matrix
Authors: Zhao Lisha , Shen Yuanli , Cai Yanhua 
Published: September 2019

Abstract
This study reported the effect of the functional additive 1H-benzotriazole (BTA) on the thermal behaviour and mechanical properties of Poly(L-lactic acid) (PLLA) through differential scanning calorimeter (DSC), infrared spectra (IR), thermogravimetric analysis (TGA) and tensile testing. The DSC measurement showed that both BTA and cooling rate greatly affected the crystallization process of PLLA, the introduction of BTA leaded to a positive effect on promoting PLLA’s crystallization, but an increase of a cooling rate was negative. Compared with other concentration of BTA, 0.5 wt% BTA had the best crystallization accelerating effect. Second, thermal decomposition indicated that the onset decomposition temperatures of all PLLA/BTA composites were higher than that of BTA at same heating rate; as well as the onset decomposition temperature of BTA increased with increasing of the heating rate. Third, the mechanical performance showed that PLLA/BTA samples presented the irregular trend in the elongation at break with increasing of BTA content, and the PLLA/3%BTA had the maximum value 2.87%.
Effects of the antioxidant CA ratio on the properties of UV-curable waterborne polyurethane for application in damping coating
Authors: Shan Changli , Ren Zeyu , Chen Qi , Ning Chuang , Xu Wei , Zhang Yingqiang 
Published: September 2019

Abstract
A series of UV-curable waterborne polyurethane with antioxidant CA (CWPU) were prepared successfully by FT-IR. The influence of CA on different properties of the CWPU emulsions and films was investigated using DLS, and DMA. The results indicated that with the increase of CA, the latex particle size increased. Meanwhile, all the films had the loss factor was≥0.3 spanning a temperature range of approximately 95°C, with a maximum value increased from 0.64 to 1.09, respectively. The CWPU films could be used as a coating for damping applications.
Force and resolution analysis in Kelvin probe force microscopy using nanotube probes
Authors: Xu Jie , Chen Jianfeng , Chen Long , Cai Yuanlingyun , Yu Tianqi , Li Jinze 
Published: September 2019

Abstract
Multiple approaches have been exploited to improve the resolution and sensitivity of Kelvin probe force microscopy (KPFM), among which an apparent method is to use probes with sharp tip apex or with nanotube attached. In this paper, the electrostatic force in KPFM with nanotube probe was calculated by Green’s function theorem and boundary element method. Based on the force analysis, the sensitivity and resolution of KPFM using ordinary and nanotube probes were further quantitatively compared with each other. It was found that KPFM measurement with nanotube probe had a better resolution, however, the sensitivity deteriorated under air condition that might constrain its applications.
Analysis of axial crushing of fiber reinforced metal tube with an eccentricity factor
Authors: Liu L Z , Tang Y , Wang C Q , Zheng F X 
Published: September 2019

Abstract
The fiber reinforced metal tubes have been proved to exhibit an excellent crashworthy performance and a high ratio of strength to weight in many experiments. Some theoretical models are promoted to predict the mean crushing force, which benefits the design of these structures. Based on the solution of Wang and Lu, the theoretical analysis is presented in this paper to consider the eccentricity factor, which represents the ratio of the outward part to the total folding length. The agreement between the calculated and experimental data reveals that the analytical model is reasonable.
Efficient Electrolytic Water Splitting with FeCoPt Trimetallic Cubic Nanocatalysts
Authors: Wang Shuang , Deng Zehui , Li Jing , Liu Haiqin , Wang Yijun , Fu Xiaoqi 
Published: September 2019

Abstract
Electrocatalytic water splitting to hydrogen energy provides an environmental, cost-effective, and sustainable approach to address worldwide energy and carbon emission challenges. Here we report a facile method for preparing trimetallic cubic nanoparticles for electrolytic overall water splitting by galvanic replacement of FeCo alloys with Pt salt solution. The as-synthesized FeCoPt trimetallic nanocatalysts demonstrated excellent activity and stability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalytic performance in 1.0 mol L-1 KOH. The FeCoPt-2 sample afforded a current density of 10 mA cm-2 at a low overpotential of 178 mV for HER and 305 mV for OER. The present study provides a facile and cost-effective synthetic process to prepare trimetallic FeCoPt nanocatalysts as high-performance electrocatalysts for overall water splitting.
Preparation of Antifouling Biomimetic Membrane in Water Treatment
Authors: Hu Jiyu , Zhang Liqing , Zhang Zhiqiang , Yang Zhenhao 
Published: September 2019

Abstract
In this paper, the preparation of antifouling biomimetic membrane in water treatment was reviewed from three aspects: superhydrophobic antifouling surface, hydrophilic antifouling surface and reactive self-cleaning surface. The antifouling biomimetic membrane has higher water flux and separation performance, and has broad application prospects in water treatment such as oily wastewater, dye wastewater and protein wastewater. Finally, based on the current research on antifouling biomimetic membrane, the future research directions of biomimetic membranes are proposed, and the development and prospects of antifouling biomimetic membrane in water treatment are prospected.
Study on The Preparation Technology of Poly-Silicate-Aluminum-Ferric (PSiAF) Coagulant Using Coal Gangue as Raw Material
Authors: Yang Yuping , Zhao Qingcai , Zeng Furong , Zhang Yuanfei 
Published: September 2019

Abstract
Si, Al, Fe were leached from coal gangue to prepare Poly-silicate-aluminum-ferric (PSiAF) coagulant. The optimal technology of preparation of PSiAF was explored through single factor experiment and orthogonal experiment. The effect factor of preparation, such as the content of silica, the molar ratio of Al to Fe (nAl:nFe), the molar ratio of metal (Al+Fe) to Si (nAl+Fe : nSi), the pH of the solution of sodium silicate, were investigated. Results show that The optimal preparation technology were the content of silica of 4%, Al/Fe molar ratio of 1:2, (Al+Fe)/Si molar ratio is 1:1 and pH of 5 of the solution of sodium silicate.