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Online since: November 2013
Authors: Laura Anania, Antonio Badalà, Giuseppe D’Agata
In fact, the failure, is strongly affected both by segregation and the extent of plasticity in the adjoining material.
With regard to transfer lengths, early empirical expressions by CNR-DT200/2004 are not readily suited for direct use for composite to masonry brick joints, unless appropriate correction factors based on experimental investigations are applied.
Materials Properties and Specimens Configuration The laboratory specimens consisted in calcareous rock brick bonded to CFRP laminates with two different kinds of anchorage.
The mechanical characteristics of all the materials employed [4,5] are shown in table 1 Table 1.
Sciolti “ Influence of material properties and specimens geometry on bond between FRP sheet and natural stone” .Atti del 2° Conv.
With regard to transfer lengths, early empirical expressions by CNR-DT200/2004 are not readily suited for direct use for composite to masonry brick joints, unless appropriate correction factors based on experimental investigations are applied.
Materials Properties and Specimens Configuration The laboratory specimens consisted in calcareous rock brick bonded to CFRP laminates with two different kinds of anchorage.
The mechanical characteristics of all the materials employed [4,5] are shown in table 1 Table 1.
Sciolti “ Influence of material properties and specimens geometry on bond between FRP sheet and natural stone” .Atti del 2° Conv.
Online since: December 2013
Authors: Abdul Kadir Marsono, Masine M. Tap, Mohammad Rezaeian Pakizeh
Dr.Department of Civil Engineering, Faculty of Civil Engineering, University Teknologi Malaysia, Johor, Malaysia
3Department of Mechanical Engineering, Faculty of Mechanical Engineering, University Teknologi Malaysia, Johor, Malaysia
amp.rezaeian@yahoo.com, bmasine@fkm.utm.my
Keywords: Safe house, shelter, tornado, In-fill wall, shear Wall
Abstract.
Every year earthquakes, tornadoes and other extreme windstorm cause fatalities or even kill people, devastate and millions of dollars’ worth of property.
The observation of post-earthquakes damages on reinforced concrete buildings has clearly shown that the presence of nonstructural elements, such as infill walls, may significantly affect the seismic performance of buildings, both in terms of seismic demand and capacity [3].
Secondly a response spectrum analysis is considered with a scale factor of the base shear of static analysis and the response spectrum analysis is equated.
Such changes significantly affect the level of demand forces and displacement on the structure.
Every year earthquakes, tornadoes and other extreme windstorm cause fatalities or even kill people, devastate and millions of dollars’ worth of property.
The observation of post-earthquakes damages on reinforced concrete buildings has clearly shown that the presence of nonstructural elements, such as infill walls, may significantly affect the seismic performance of buildings, both in terms of seismic demand and capacity [3].
Secondly a response spectrum analysis is considered with a scale factor of the base shear of static analysis and the response spectrum analysis is equated.
Such changes significantly affect the level of demand forces and displacement on the structure.
Online since: February 2022
Authors: Sharona Q. Barroga, Jem Valerie D. Perez, Debora F. Rodrigues
A highly colored effluent is an indicator of a contaminant and this obstructs the passage of sunlight into the bodies of water, retards photosynthesis, affects the growth of aquatic organisms, and can cause various illnesses because of their carcinogenic and mutagenic properties [1], [2].
To avoid further contamination, magnetically separable photocatalysts can be utilized due to their magnetic properties making the separation and recovery of the materials easier and more efficient via the application of external magnetic fields [16], [17].
In addition, dissolution of MoO3 in aqueous systems has been a reported issue in different studies and its rate of dissolution can be due to the size, crystallinity, shape, surface area, and exposed plane, among other factors [19], [20].
To overcome this problem, conductive polymers such as polypyrrole (Ppy) have been used as coatings to nanomaterials due to their favorable electrochemical, magnetic, and optical properties as well as good environmental stability [21].
The mixture was heated in a water bath to 70oC for 8 hours with mechanical stirring.
To avoid further contamination, magnetically separable photocatalysts can be utilized due to their magnetic properties making the separation and recovery of the materials easier and more efficient via the application of external magnetic fields [16], [17].
In addition, dissolution of MoO3 in aqueous systems has been a reported issue in different studies and its rate of dissolution can be due to the size, crystallinity, shape, surface area, and exposed plane, among other factors [19], [20].
To overcome this problem, conductive polymers such as polypyrrole (Ppy) have been used as coatings to nanomaterials due to their favorable electrochemical, magnetic, and optical properties as well as good environmental stability [21].
The mixture was heated in a water bath to 70oC for 8 hours with mechanical stirring.
Online since: October 2010
Authors: Fu Shan He, Cheng Hui Gao, Shao Yan Ye
Surface modification typically involves one of four methods, namely chemical, physical, physical-chemical and mechanical.
The interface compatibility of plant fiber and resin is the key factor that determines the characteristics of the composites.
After different treatment the microstructures of bamboo fiber surface change, as show as Fig. 3, which affect the interfacial bonding strength.
Not only the fibers are prone to be pulled off by external force, but also some defects such as pores and delaminations emerge and affect yield and density of sample.
Reducing the water content is the key to increase proceeding property of the products. 2) After the alkali treatment of bamboo fibers by 17% NaOH solution for 12 hours, the composites have the optimum combination of high friction coefficient and low wear rate with the desirable fade resistance.
The interface compatibility of plant fiber and resin is the key factor that determines the characteristics of the composites.
After different treatment the microstructures of bamboo fiber surface change, as show as Fig. 3, which affect the interfacial bonding strength.
Not only the fibers are prone to be pulled off by external force, but also some defects such as pores and delaminations emerge and affect yield and density of sample.
Reducing the water content is the key to increase proceeding property of the products. 2) After the alkali treatment of bamboo fibers by 17% NaOH solution for 12 hours, the composites have the optimum combination of high friction coefficient and low wear rate with the desirable fade resistance.
Online since: September 2022
Authors: Cumali Celik, Begum Ozgen, Ali Tuncay Ozyilmaz
Although many studies have shown that polyaniline and its derivatives have excellent performance in protecting metals against corrosion, it is revealed that these polymer films exhibit poor dispersion and poor mechanical properties when exposed to a corrosive environment for a long time.
The main factors affecting the anticorrosion performance of electrodeposited coating include thickness, doping type of film, oxidation type and degree, porosity, roughness and adhesion.
Numerous studies have been reported that several nanoparticles such as alumina (Al2O3) [32], titanium dioxide (TiO2) [33], silica (SiO2) [34] and nanopolymer composite [35,36] incorporated into the polymer matrix to improve the electron transfer rate, mechanical properties and corrosion resistance of coatings.
Besides, the addition of nanomaterials to the interchain space of poly (o-aminobenzyl alcohol), a derivative of polyaniline can significantly improve the mechanical and anti-corrosion properties of the poly (o-aminobenzyl alcohol) film-containing coating For this purpose, the novelty of this study is to investigate the synthesis and anticorrosive properties of poly (o-aminobenzyl alcohol) film in the presence of both Schiff base and nanoparticle, and there is no report about both doped conductive polymer in the literature.
In this context, the anticorrosive properties of stainless steel have been improved by the production of an excellent and efficient new conductive polymer with faster electron transfer, more delocalized π electrons and higher mechanical properties with the contribution of both Schiff base and nanoparticle.
The main factors affecting the anticorrosion performance of electrodeposited coating include thickness, doping type of film, oxidation type and degree, porosity, roughness and adhesion.
Numerous studies have been reported that several nanoparticles such as alumina (Al2O3) [32], titanium dioxide (TiO2) [33], silica (SiO2) [34] and nanopolymer composite [35,36] incorporated into the polymer matrix to improve the electron transfer rate, mechanical properties and corrosion resistance of coatings.
Besides, the addition of nanomaterials to the interchain space of poly (o-aminobenzyl alcohol), a derivative of polyaniline can significantly improve the mechanical and anti-corrosion properties of the poly (o-aminobenzyl alcohol) film-containing coating For this purpose, the novelty of this study is to investigate the synthesis and anticorrosive properties of poly (o-aminobenzyl alcohol) film in the presence of both Schiff base and nanoparticle, and there is no report about both doped conductive polymer in the literature.
In this context, the anticorrosive properties of stainless steel have been improved by the production of an excellent and efficient new conductive polymer with faster electron transfer, more delocalized π electrons and higher mechanical properties with the contribution of both Schiff base and nanoparticle.
Online since: January 2014
Authors: Marian Šofranko, Erika Škvareková, Gabriel Wittenberger
The main advantage of these methods is stopping the formation of typical effect of mining works, negatively affecting environment in the long-term.
Following indicators, significant also for use of magnesite potentially viable materials in the backfilling mixtures, were monitored within the solution: · Physical – mechanical properties of the aggregate: particularly significant are its granulometric composition, capacity weight, absorbability, porosity, shaping and chipping ability
As was confirmed by further research of the strength properties of these mixtures, granular composition of the two main mentioned sorts was very significant for the strength properties of the resulting backfilling mixtures.
Monitoring of the strength properties of the resulting mixtures, which can be in various forms applied to backfilling, was the most important part of the research.
Thus it will be necessary to take this phenomenon into account also at suggesting, and further monitoring of their main properties and characteristics directly in this environment.
Following indicators, significant also for use of magnesite potentially viable materials in the backfilling mixtures, were monitored within the solution: · Physical – mechanical properties of the aggregate: particularly significant are its granulometric composition, capacity weight, absorbability, porosity, shaping and chipping ability
As was confirmed by further research of the strength properties of these mixtures, granular composition of the two main mentioned sorts was very significant for the strength properties of the resulting backfilling mixtures.
Monitoring of the strength properties of the resulting mixtures, which can be in various forms applied to backfilling, was the most important part of the research.
Thus it will be necessary to take this phenomenon into account also at suggesting, and further monitoring of their main properties and characteristics directly in this environment.
Online since: October 2014
Authors: Ze Bin Zhang, Qiang Zeng, Ling Shen
E, L and y are continuous parameters, and E, L can affect value of y.
Firstly, let the v+w factors in E and L plus or minus corresponding tolerance to get the error factor level table, shown as Table 2.
Orthogonal Table (Worksheet) A B C … L 1 Factor Test number Factor 1 Factor 2 … Factor v+w 2 1 1 1 … 1 … … 1 2 … 2 n+1 n 3 3 … 2 Table 4.
Journal of Mechanical Engineering, 2011, 47(24): 97-103
Journal of Mechanical Engineering, 2013, 49(5):130-137
Firstly, let the v+w factors in E and L plus or minus corresponding tolerance to get the error factor level table, shown as Table 2.
Orthogonal Table (Worksheet) A B C … L 1 Factor Test number Factor 1 Factor 2 … Factor v+w 2 1 1 1 … 1 … … 1 2 … 2 n+1 n 3 3 … 2 Table 4.
Journal of Mechanical Engineering, 2011, 47(24): 97-103
Journal of Mechanical Engineering, 2013, 49(5):130-137
Online since: October 2011
Authors: Shuang Ping Duan
In this section, one type of commonly used external wall with brick are chosen to analyze indoor temperature fluctuation and cooling load reduction using night ventilation, The thickness L of all these walls is 240mm.The material properties of brick is km=0.81 W/m·K, ρm=1800 kg/m3, cm=1.05 KJ/kg·K
The simple building is 3 m ×3m× 3 m.
For no ventilation mode , it means that the windows and doors of the building is closed and no mechanical ventilation is on at daytime from 8:00 to 20:00.
Compared Fig.2b with Fig.2a, with ventilation flow increasing, outdoor air temperature is the most important factor affecting indoor air temperature.
Fig.3 and Fig.4 respectively give indoor air temperature and cooling load affected by the mean outdoor air temperature and outdoor temperature swing.
For no ventilation mode , it means that the windows and doors of the building is closed and no mechanical ventilation is on at daytime from 8:00 to 20:00.
Compared Fig.2b with Fig.2a, with ventilation flow increasing, outdoor air temperature is the most important factor affecting indoor air temperature.
Fig.3 and Fig.4 respectively give indoor air temperature and cooling load affected by the mean outdoor air temperature and outdoor temperature swing.
Online since: March 2022
Authors: Roland Tolulope Loto, Cleophas Akinloto Loto, Oladimeji Olaniyan
Introduction
Ferrous alloys are widely utilized for structural applications in building construction, machinery and devices, pipelines and columns, automobiles and fertilizer production etc. due to their versatility and adaptable mechanical properties [1].
However, its concentration dependent performance shows decrease or increase in concentration significantly affects its performance.
Obot, Inhibitive properties, thermodynamic and quantum chemical studies of alloxazine on mild steel corrosion in H2SO4, Corros.
Loto, Anti-corrosion performance of the synergistic properties of benzenecarbonitrile and 5-bromovanillin on 1018 carbon steel in HCl environment, Sci.
Corrosion inhibition properties of the synergistic effect of 4-hydroxy-3-methoxybenzaldehyde and hexadecyltrimethylammoniumbromide on mild steel in dilute acid solutions, J.
However, its concentration dependent performance shows decrease or increase in concentration significantly affects its performance.
Obot, Inhibitive properties, thermodynamic and quantum chemical studies of alloxazine on mild steel corrosion in H2SO4, Corros.
Loto, Anti-corrosion performance of the synergistic properties of benzenecarbonitrile and 5-bromovanillin on 1018 carbon steel in HCl environment, Sci.
Corrosion inhibition properties of the synergistic effect of 4-hydroxy-3-methoxybenzaldehyde and hexadecyltrimethylammoniumbromide on mild steel in dilute acid solutions, J.
Online since: May 2012
Authors: Jin Li, Yang Cao, Hou Bo Zhou
Physical and chemical properties of biodiesel.
The physical and chemical properties of biodiesel were also tested, that is produced by the optimum condition.
Study on technologcial conditions of transesterification and the properties basic of biodiesel.
Influence of soybean biodiesel content on basic properties of biodiesel–diesel blends.
[19] Wenfeng Liu: Study on Technologcial Conditions of Transesterification and the Basic Properties of Biodiesel.
The physical and chemical properties of biodiesel were also tested, that is produced by the optimum condition.
Study on technologcial conditions of transesterification and the properties basic of biodiesel.
Influence of soybean biodiesel content on basic properties of biodiesel–diesel blends.
[19] Wenfeng Liu: Study on Technologcial Conditions of Transesterification and the Basic Properties of Biodiesel.