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Online since: July 2012
Authors: Kittichai Triratanasirichai, Cherdpong Chiawchanwattana
Many factors affect the degree of wall deposition.
These include operating parameters such as airflow patterns (chamber geometry and position of inlet-outlet port), primary conditions (inlet temperature, air flow rate, flow rate of liquid feed, and particle size), and wall properties (wall materials) [3,4].
In this paper, we attempted to observe the behavior of wall deposition temperature changing in a tall-form spray dryer at various operating temperatures, and the factors that the effects of thermocouple wiring on the surface area had at different elevations in the drying chamber.
Experiments were carried out in the pilot-scale spray dryer at the Department of Mechanical Engineering at Khon Kaen University, Khon Kaen, Thailand.
Acknowledgements The authors would like to express their sincere thanks to Department of Mechanical Engineering, Faculty of Engineering, Khon Kaen University and King Mongkut’s University of Technology North Bangkok, Thailand for their financial support.
Online since: February 2012
Authors: Hong Jie Chen
Consistency of the response of the DM is the most important factor guaranteeing the success of the procedure.
This analysis can help to identify the key design variables whose variation affects mostly the performance indices.
In fact variance-based analysis requires a one-factor-at-a-time treatment.
The rating results are evaluated in conjunction with the chosen material properties and a decision is made whether to proceed with this design or iterate to a better solution.
Mechanical constraints require the calculation of the loads, stresses and deformations produced during the meshing gear teeth but this demands the evaluation of geometrical constraints at the first stage.
Online since: September 2007
Authors: Ming Li Huang, Shan Yong Wang, Wan Cheng Zhu, Wei Lu
Changes in the frictional end confinement will affect the stress state in the end zone and consequently the whole specimen.
As a result, the interaction of two factors namely the end effect and the pre-existing crack will affect the terminal failure mode of the specimen.
The mechanical properties parameters for the platen and specimens are listed in Table 1.
It is necessary to note that the homogeneous index m was 100 in the numerical tests, which indicates that the specimen is almost homogeneous, in order to simulate the property of glass of experimental tests [5].
Therefore, it can be concluded that not only the end effect zone can influence the propagation of wing crack, but also the propagation of wing crack can affect the end effect zone of specimen, and both end effect zone and the propagation of wing crack will influence the terminal failure of specimen.
Online since: December 2010
Authors: Jian Geng, Jian Sheng Shen, Wei Chen
The electrical properties of concrete are similar with electrolyte, and namely it belongs to the semiconductor [1].
There are many factors affecting concrete resistivity, such as compositions of raw materials, mix proportions and service condition, etc; but the most direct and effective method is adjusting the compositions of raw materials.
Now the researches about them are more focused on their effects on concrete workability, mechanical property, durability and micro-structure [6-9].
However there are still no systemic and deep studies about their effects on concrete electrical properties.
Table 1 lists the chemical composition and physical properties of cement and mineral admixtures.
Online since: July 2012
Authors: Wei Li, Qiang Han Fang
Study on behavior of ceramic phases in laser surface ceramic process Wei Li1,a , Qianghan Fang1,b 1School of Mechanical Engineering, Shandong Jiao’tong University, Ji’nan 250023, P.
In material design, the service property of the layer should be considered as well as the property matching between the matrix and ceramic phases, the size and composition of ceramic phases, interface bonding between the coating and matrix, etc. to develop the best property combination of composite components and produce excellent compound layer[1].
As far as material system is concerned, different material system will cause different dissolution degree of ceramic phases in the layer and affect the structure and property of the layer.
The above research results proved the effect of material system on the layer’s structure and property.
It’s affected by various factors such as material system, grain size and laser parameters, etc.
Online since: October 2008
Authors: Cheng Hock Tian, S. Mohammed Bashar, Kamal Nasharuddin Mustapha
The deformability of structures thus is evaluated by an elastic analysis of members treated as prismatic (ie. with constant cross-sectional properties).
A reduction factor 1α of 35% was found to be an effective tuning parameter for the deflection prediction as seen in Fig.6 to Fig.10.
A reduction factor 1β of 25% was found to be an effective tuning parameter for the deflection prediction as seen in Fig.6 to Fig.10.
Since eI is a function of the cube of the compression block thickness, a small error in the calculation of this dimension will significantly affect stiffness and deflection prediction.
The simple analytical equations greatly simplifies the analysis process since the entire load-deflection response is calculated based on basic linearized equations after determining the section properties that the designer would need to compute in practice anyway.
Online since: May 2012
Authors: Quan Cai Wang, Hao Wang, Xiao Ling Xu, Qing Wu
Change of groundwater level is one of the most important factors of landslide prediction.
Previous studies on groundwater of landslide were mainly about slope stability of mechanical mechanism, but for variation of groundwater level of landslide area is scarce studied.
In this paper, monitoring groundwater level of K144 landslide two years, we contrast groundwater level of landslide zone and potential deformation rising and falling, study on variation of groundwater level which affect k144 landslide reactivation.
In order to ensure the safety of people's lives and property and keep the National Highway G65 unblocked, relevant departments simply cleared earthwork of the landslide surface .
Some scholars who calculated slope stability affected by groundwater found when groundwater level of colluvial landslide increase of 0 1H, the stability coefficient reduced 0.05 ~ 0.07[9].
Online since: January 2010
Authors: A. Saritha, Joseph Kuruvilla, Thomas Sabu
Nanocomposites are the materials for the future, which have improved mechanical properties.
This interest in CNTs is due to their large aspect ratio (>1000), and their mechanical, electronic and conductive properties.
Reproduced from [119]. 6.4 Fire retardancy Fire hazards result primarily from the combination of a number of different factors.
Both the temperature-sensitive polymerclay interaction and the shear field are critical factors controlling the disorientation process of oriented clay layers.
Landel in : Mechanical properties of polymers and Composites, New York: Marcel Dekker(1994) [6] M .
Online since: March 2016
Authors: Qing Quan Duan, Hong Zhang, Meng Ying Xia, Xiao Ben Liu
The corrosion defect will cause stress concentration under the service load, likely leading to a failure, and seriously affecting the safety operation of the oil tube.
Tube Material Properties.The N80 steel widely used in the Tahe oil field in China was considered in this study.
As the axial force grows to a certain extent, the oil tube with a smaller internal pressure is affected by the axial force.
In conclusion, the axial force is the most important factor for the maximum stress, and the internal pressure almost has no effect on the stress.
[14] The American Society of Mechanical Engineers, ASME FFS-1-2007 fitness-for-service, second ed., API, Washington DC, 2007
Online since: September 2005
Authors: Aldo Roberto Boccaccini, R. Jerome, V. Maquet, J.J. Blaker, S. Blacher, Judith A. Roether
If the properties of biodegradability and bioactivity are to be combined in an optimised scaffold for bone tissue engineering, then the design of composite materials offers an exceptional opportunity; by combining bioresorbable polymers and bioactive ceramic phases, scaffolds with tailored physical, biological and mechanical properties can be produced.
® particles Degradation in phosphate buffer saline affected by Bioglass® additions [20] PDLLALMW and PLGA75 7.1- 11.8* (0-40 wt %) Pore volume decreased with increasing amount of Bioglass® Mechanical properties improved by addition of Bioglass® The presence of Bioglass® delayed the polymer degradation rate [21] PLGA75 not reported Filler (40 wt%) Scaffolds of tubular shape with oriented porosity [22] PDLLAHMW > 90 Filler (5, 40 wt%) Cell adhesion and proliferation using lung cells [23] *pore volume (cm3/g) Bioglass® coatings were made using a slurry-dipping technique, as described in previous studies [26].
Discussion The thermally induced phase separation (TIPS) technique considered here for fabrication of porous composite scaffolds offers many advantages [5, 19], in particular: (i) optimal control over pore volume fraction, (ii) possibility of designing pore shape, orientation and size, (iii) amenable to be applied to any polymer soluble in a suitable solvent, (iii) reproducibility, and (iv) possibility to incorporate bioactive substances or growth factors into the polymer matrix.
Conclusions The PDLLA/Bioglass® and PLGA/Bioglass® composites produced by thermally induced phase separation process, as reviewed in this paper, exhibit a very attractive combination of biodegradability and bioactivity properties in a highly porous architecture, promising ideal scaffolds for tissue engineering.
Moreover, the use of Bioglass® particles both as fillers and coatings in foam-like scaffolds adds to the possibilities of tailoring of the time-dependant mechanical properties and the rate of in vitro (and in vivo) resorption of composite scaffolds for the required application.
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