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Online since: January 2016
Authors: Ming Chen, Jin Bang Song, Steve G.F. Shen, De Dong Yu, Zi Han Zhao, Liang Wen
Drilling force and temperature are the two most effective factors that affect the bone drilling quality which demands for a high degree stability of the drilled holes in order to make the screws grip the holes firmly.
In terms of the controlling of the drilling temperature, Udiljak stated that cutting speed, feed rate and drill specifications are the main factors influencing the temperature generation during the bone drilling [4].
Among the drill coatings, diamond coating, unlike other coatings which have contaminative elements that will do harm to the human body, has a good histocompatibility and self-lubrication property besides the enlargement of the drill life.
And the parameters of the micro-drilling experiment under the single factor test method are shown in Table 3.
(1) The coolant is also a factor affecting the drilling force and temperature, so the performance of the diamond coating under the condition of cooling should be tested in the subsequent research.
Online since: June 2019
Authors: Yan Hua Liu, Yan Yan Wang, Xiao Xing Zhang, Liang Gu, Zhi Yong Xu, Chang Si Peng
With the increase of KH-560 content, two key factors (surface microstructure and low surface energy) contributing to the superhydrophobicity of the coating layers did not change greatly, so the difference in KH-560 content had little effect on the super hydrophobicity of the coating.
However, the ratio significantly changed the mechanical stability of the superhydrophobic coating.
And the results showed that the method could improve the mechanical stability effectively, and the different coupling agent content had great influence on the mechanical stability of the superhydrophobic surface.
As can be seen from the above, the sol-gel process was simple, low cost, and theprepared superhydrophobic coating had godd hydrophobicity and mechanical properties.
Sun, Recent developments in superhydrophobic surfaces with unique structural and functional properties, Soft Matter, 8 (2012) 11217-11231
Online since: September 2013
Authors: Chang Ying Shi, Li Juan Wang
Using recycled coarse aggregate of Class I to get the high-strength class concrete block,using cycled coarse aggregate of Class III to get the concrete block whose strength level meets the requirements and to get concrete block that has excellent thermal insulation properties, to meet the needs of the diverse market.
It restricted economic development and affected the implement of sustainable development in our country to a great extent [3].
This topic is mainly for the application technology research of producing recycled concrete block from construction waste, to guarantee the reasonable and scientific utilization of recycled aggregate to reduce the gas emissions of greenhouse.By controlling the raw materials, mixture ratio, curing conditions and other factors to produce high-strength grades of recycled concrete block, to provide technical support for the resource utilization of construction waste, and to promote recycled aggregate to generate significant economic, social and environmental benefits by a reasonable application [5].
Using recycled coarse and fine aggregate of Class I to get the high-strength class concrete block,using cycled coarse and fine aggregate of Class III to get the concrete block whose strength level meets the requirements and to get concrete block that has excellent thermal insulation properties,taking the aim at recycling of construction waste in maximum,to meet the needs of the diverse market.
Recycled aggregate concrete brick, brick by brick, 2007, (8):5-8 [6] Huang Wei, Mechanical properties of fly ash concrete block test study[J].
Online since: October 2020
Authors: Milton Sergio Fernandes Lima, Maurício Marlon Mazur, Viviane Teleginski Mazur, Sílvia Rosa Nascimento, Marilei de Fátima Oliveira, Willer Cézar Braz, Correard Gilson Carlos de Castro
Optical microscopy showed the formation of a grain size refined morphology in the heat affected zone and fusion zone.
The formation of characteristic regions of a metal laser welding cross section micrograph was observed, i.e., the fusion zone (FZ), heat affected zone (HAZ) and the unaffected base material (BM).
Optical microscopy micrographs for laser welded samples (a) P1 with magnifications of fusion zone (b), heat affected zone (c) and base material (d); (e) P2 and (f) P3.
It is well known that reduction of grain size is beneficial to mechanical properties of welded materials.
Conclusions The variation of the scanning speed on the laser welding process is the main factor that alters the corrosion behavior.
Online since: June 2013
Authors: Patrick Norman, Claire Davis, Cédric Rosalie, Nik Rajic
However, when this work was extended to other thinner plate specimens it was found that at these higher frequencies, the cyanoacrylate adhesive (M-Bond 200) used to attach the FBG sensors to the plate was significantly affecting the propagation of the waves.
Laser vibrometry was used to characterise the wave-field in the region surrounding the adhesive and it was found that the self-adhesive retro-reflective tape applied to aid with this measurement was also affecting the wavefield in the higher frequency regime.
The degree of influence of the surface layer appears to be a function of its material properties, the frequency of the incoming wave and the thickness and footprint of the surface layer relative to the base material thickness.
Thus, awareness of the influence of the dimensions and material properties of the sensor and adhesive layer become critical, particularly in the high frequency regime.
The exact cause for this is unknown but a number of likely factors were identified as follows: imperfect co-location of the PZT pair; inhomogeneities in the epoxy bond line; bond line asymmetry of the PZT pair and distortion of the drive signal as a result of the high gain at which the amplifier was operating.
Online since: December 2012
Authors: Chun Yuan Shi, Ping Zhu, Kun Zhou
Its anti-fatigue performance and reliability of directly affects the safety of train traveling.
Currently, the methods of improving fatigue properties of welded joints include hammering, shot peen, dressing, and ultrasonic impacting method [4,10].
Assuming the cold and heat source move with the same speed v, the shape of the cold source affecting on the specimen plane is oval-shaped, its energy distribution is similar to Gaussian distribution, then in time t ,the cold flow intensity of any point on weld is: qLB = qLexp{-kL[(x-vt)2+y2]} =qLFL(x,y,t) (3) where kL is the concentration factor of the cold source , FL as a function of time, qLis the maximum cold flow intensity.
Nonlinear material properties of high temperature are taken into consideration during the calculation.
Its mechanical and thermal physical parameters depend on the temperature, in the simulation, The properties parameters that close to and above the melting temperature are obtained by extrapolation [8].
Online since: December 2014
Authors: Ying Chao Ji, Ying Wang, Zhi Hua Yu, Cheng Wei Luo
The optimum process was achieved after three single factor experiments.
This makes textile materials maintain not only their original styles, such as softness, air permeability, strength, elongation, etc, but also some special properties from nano-TiO2, such as anti-static, self-cleaning, antibacterial, oil repellent function, as well as the property of reflect and absorb the ultraviolet and infrared light[2].
However, during the process, problems like unevenly dispersed nanoparticles and their effect to the main properties of the fibers are still existed [4].
This phenomenon also affects the physical and mechanical properties of the fibers.
Fig. 1 Nano-TiO2 powder Fig. 2 Nano-TiO2 dispersion 3.2 The single factor experiment by the assist of supercritical CO2 Effect of time on the adhesion of nano-TiO2.
Online since: October 2014
Authors: Mircea Horia Tierean, Ruxandra Margarit, Oana Cella Andrei, Livia Alice Tanasescu
The denture was scaned in Dental View radiology center and the tomographic images were combined with the constant mechanical and thermal properties of the materials and were used to create the 3D model (Fig.1).
The maximum value of the masticatory force is very different from individual to individual, depending on several factors [9,10,11].
The placement of the occlusal loads affects the maximum stress level, but not its exact location.
Bec, Force and Influential Factors on Bite Force Measurements: A Literature Review, Eur.
Mijiritsky, Mechanical behavior of major connectors – Part 1: Influence of supporting tissues, Refuat Hapeh Vehashinayin, 24:1 (2007) 8-13.
Online since: September 2014
Authors: Arya Hosseinipour, Khalik M. Sabil, Andhy Arya Ekaputra, Azuraien B. Japper, Lukman B. Ismail
The component’s compositional and structural analysis of the crude oils is key factors to be studied to mitigate wax formation and precipitation tendency for the betterment of the crude oil flowability.
The types of wax crystals can also be affected by several factors such as composition, fluid dynamics and temperatures [16].
Physicochemical properties of crude oils Crude oil's properties/parameters 1 2 3 WATa (°C) 26.46 38.21 52.51 N content of crude oil > 14 (wt%) 43.76 51.75 55.39 B, C or A content of crude oil > 14 (wt%) 3.33 15.15 19.30 N content of crude oil 16≤ N ≤25 (wt%) 30.87 36.05 37.87 N, B, C or A content of crude oil > 14 (wt%) 47.09 66.90 74.69 N content in crude oil > 25 (wt%) 9.04 12.41 14.81 a) Temperature uncertainty is ±0.024 °C, ±0.07 °C and ±0.387 °C for crude oil 1 to 3 respectively.
Therefore, knowing the type of components, compositions and their structures of crude oils is prominent factor to be understood to secure inhibition of wax precipitation and deposition for flow assurance purposes.
Crystallization and dissolution temperatures, and Newtonian and non-Newtonian flow properties.
Online since: October 2010
Authors: Shu Tao Huang, Li Zhou, Li Fu Xu
Introduction Diamond films have excellent mechanical, electrical and optical properties, such as extreme strength, hardness and elastic modulus, excellent wear resistance, and optical transparency over a wide range of wavelengths.
In order to overcome these drawbacks of the mechanical polishing method, the alternative polishing techniques such as thermo-chemical polishing [5-6], plasma etching [7], ion beam etching [8] and chemically assisted mechanical polishing [9] have been developed.
Therefore, the temperature rise at the interface is the critical factors in realizing the super-high speed polishing.
Firstly, with the interface temperature rise is so high that the polishing plate metal becomes softer and small metal particles will adhere firmly to the polished diamond surface, which will affect the further polishing of the diamond film.
Conclusion The high efficient and precise polishing of CVD diamond film is the key subject that affect its application and development.
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