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Online since: February 2012
Authors: Yi Qin
Since GBFS has this special hydration-reaction mechanism, its properties of concrete are different OPC.
It studied by physical-mechanical and durability tests by using mixture and hardened with combinations after prepared NSC with GBFS.
Mineral composition of raw materials and physical property follows in Table 1.
This may be related to the insufficient number of experiments and statistical analysis without relevant safety factor of concrete and other factors.
Strength properties.
Online since: September 2013
Authors: Xiao Cai Yu, Jin Fang Chen, Yun Qing Liu, Xiao Xv, Xu Zheng
With the target of removing diesel from seawater, the influence of various factors on the laccase-catalyzed degradation process was discussed.
Numerous methods, such as mechanical collection, combustion and biological degradation, may be used in aquatic contaminants.
Laccase is a series of polyphenol oxidases which have similar but not identical property.
To investigate factors that could affect the diesel removal, reaction time, reaction temperature, the dosage of immobilized HRP and initial concentration of diesel in the oily wastewater were varied; pH of the reaction system was varied by phosphoric buffer solution.
This trend depends on the laccase lower substrate concentration decreased, and the resultant factors resulting in the inhibition of enzyme activity.
Online since: December 2024
Authors: Van Hao Pham, Nguyen Kim Khanh Linh, Nguyen Thi Ngoc, Tu Anh Nguyen, Thuan Quang Nguyen, Thao Thu Le, Trang Thuy Thi Nguyen, Vuong Hung Pham, Dang Quoc Khanh
This surge is primarily fueled by factors such as an aging population, accidents, and injuries resulting from sports activities.
However, studies on the influence of compaction pressure on the mechanical properties of porous Ti materials are still limited.
Consequently, at this particular location, NaCl may experience localized melting, directly affecting the crystallization process of Ti.
We compared the mechanical properties of porous titanium materials fabricated using the SPS method, where NaCl was used as a space holder.
In further studies, we will focus on different temperatures below 700 degrees Celsius and the influence of other technological factors to optimize the fabrication process.
Online since: September 2007
Authors: Hao Ran Geng, Xin Ying Teng, Shou Ren Wang, Lin Hai Hui, Fu Song Xu
In order to control the functional properties and to improve mechanical properties such as yield strength and ultimate tensile strength, it is very necessary to introduce another hard phase into the ductile matrix.
There are a lot of factors to affect the fracture toughness such as the volume fracture of reinforcement phase, microstructure and interface characteristic.
So the mechanism of reinforcement phase affecting the fracture toughness of 3DNMMC is not well understood.
There are other reasons for causing the deterioration of fracture properties.
Fig. 4 Fractographs of Mg-Al-Zn-Al2O3 Fig. 5 Magnification of fractographs of composites Mg-Al-Zn- Al2O3 composites Mechanical properties.
Online since: March 2017
Authors: Bel Abbès Bachir Bouiadjra, Djebbar Noureddine, B. Serier
The predictability of dental implants is affected by biologic, technical, and biomechanical factors [2].
The control of these factors is important to bone preservation [3], [4]and prosthetic complication reduction [5], which could extend the implant-supported rehabilitation success rate [6].
The bone-implant interface properties are determined by the quantity of the implant surface in intimate contact with mineralized bone tissue as well as by the mechanical quality of bone tissue around the interface.
Table 1 Physical properties of the different components used in this study [26].
Mechanical properties of materials used in this study are shown in Table 1.
Online since: September 2011
Authors: Ali Sadrmomtazi, Romina Zarshin Zanoosh
A test program was carried out to determine the mechanical properties of rubberized concretes with and without silica fume and polypropylene fiber.
Experimental results and discussion Physical and mechanical properties Compressive Strength.
The major inherent factor that affects the properties of the fiber reinforced is the bond strength of the polypropylene fiber with cement composite.
Addition polypropylene fiber improves mechanical properties of cement composite containing rubber particles and silica fume.
Noumowe: Mechanical properties and microstructure of high strength concrete containing polypropylene fibers exposed to temperatures up to 200 –C.
Online since: October 2012
Authors: Xiao Li Wu, Chen Guang Wei, Xiao Ying Den
Thermal properties and generating electricity efficiency of this module are also introduced in this article.
The secondary factors are the position of solar cells (close to the top glass or the bottom glass), the width of the spacer and the thickness of glass.
The optical properties of components mainly affect the short-circuit current and temperature mainly impacts the open circuit voltage and fill-factor.
The deviation of film thickness affects its electrical properties.
The study on thermal properties of insulated double-glass photovoltaic modul [J].
Online since: January 2012
Authors: Zhan Qiang Liu, Yi Wan, C. Li, R.R. Zhang
The chemical composition and the mechanical properties of the material are presented in Table 1 and Table 2, respectively.
Table 1 Chemical composition of 7050-T7451(wt.%) Zn Cu Mg Zr Fe Si Mn Ti Cr Others Al 6.7 2.5 2.3 0.12 0.13 0.12 0.10 0.06 0.04 0.15 87.9 Table 2 Mechanical properties of 7050-T7451 Yield strength [MPa] Tensile strength [MPa] Elongation [%] Hardness [HB] Young modulus [GPa] 455 510 10 135 71.7 Experimental set-up.
Therefore, it means that the thermal load and mechanical load together affect the surface residual stress.
However, the dominative factor that affects the surface residual stress is the mechanical load due to a relatively small elastic modulus.
The following conclusions can be drawn: (1) The dominative factor that affects the compressive surface residual stress is the mechanical load, especially the strong burnishing effect the tool flank surface produced
Online since: February 2015
Authors: V.C. de Almeida Cruz, Antonio Gilson Barbosa de Lima, M.M. Silva Nóbrega, L.H. de Carvalho, W.S. Cavalcanti, João M.P.Q. Delgado
They are also sensitive to internal factors such as fiber volume fraction and orientation.
Kulkarni, Structure and properties of some vegetable fibres.
Liao, Effects of environmental aging on the mechanical properties of bamboo-glass fiber reinforced polymer matrix hybrid composites, Compos.
Nutt, Influence of hygrothermal environment on thermal and mechanical properties of carbon fiber/fiberglass hybrid composites, Compos.
Verdu, Factors governing water absorption by composite matrices, Compos.
Online since: March 2011
Authors: Jing Guo, Min Zhu, Ji Fang Zhou, Tao Lu, Hua Feng Deng
., Chengdu 610021, China adhf8010@126.com, bshowseal@yahoo.cn, czhumin2006105131@126.com, d287685258@qq.com, e2010696@qq.com Keywords: steel-lined, penstock, concrete crack, cracking width Abstract: According to mechanic properties of steel-lined reinforced concrete penstock, author abstracted and simplified its mechanical model, designed and produced 20 axis tensile structures of reinforced concrete, and proposed the test methods on the ratio of crack widths on two sides of concrete protective covering.
It can be found in survey [4] that some penstocks those have been built have large cracks on the surface (even come to 1.7mm), which may affect the durability of outer reinforcement of penstock, but it's difficult to test the width of concrete cracks in the outer reinforcement on site.
Fig.1 Axial Tension Component of Reinforced Concrete According to previous studies, covering thickness, concrete strength, reinforcement diameter, superficial form of reinforcement, reinforcement spacing, reinforcement ratio, and etc. may affect the width of concrete cracks, and 20 specimens were Designed and produced on the basis of considering these factors, which are shown in Table 1.
The main reasons for the difference between crack widths on two sides are variability of material properties, approximation of calculation model and limitation of measurement accuracy.
Conclusions According to mechanic properties of steel-lined reinforced concrete penstock, its mechanical model is simplified as axial tension component of reinforced concrete, and the crack widths on two sides of concrete protective covering are measured and analyzed by test method.
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