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Online since: August 2013
Authors: Cherng Shing Lin, Te Chi Chen
Numerical Modeling of Fire Dynamic Behavior for a Five-Story Building Cherng-Shing Lin1*, Te-Chi Chen2, 1~2 Department of Mechanical Engineering Yuan Ze University, Taiwan 32003, R.O.C email: mecslin@saturn.yzu.edu.tw Keywords: particles, stack effect, smoke diffusion, numerical model Abstract.
According to statistical information shown in Table 1, major fire accidents have occurred frequently at public recreation venues throughout the country over the past several years, resulting in significant losses of life and property.
Because of numerous factors such as improper zoning of sites, the use of inflammable materials in decorations, blocked building evacuation passages, and business owners’ ignorance of fire safety measures, when fire accidents occur, deaths or serious injuries usually result.
Some people fled toward the third floor only to become affected by the pervading smoke particles, declining layer, and decreased visibility; therefore, they were unable to discern the correct direction for escape.
Online since: September 2013
Authors: Tian Yin Huang, Rong Wang, Wei Wu, Feng Liu
The stability of the microbial system was efficient in stabilizing nitrification. 1 Introduction Biofilm is a living, continuously renewing community of one or several bacterial species attached to biogenous or abiogenous substrates and surrounded by a polymeric matrix, which protects them from damaging effects of the environment and serves as a factor of intercellular communication[1].
The SS concentration in the influent of SCB is very low, which barely allows the startup phase to affect the removal efficiency.
This occurs because the biofilm on the suspended filler is porous and has strong adsorption properties[19].
[6] Hai-Yan Li , Ye-Qiang Tan, Lu Zhang, Bio-filler from waste shellfish shell: Preparation, characterization, and its effect on the mechanical properties on polypropylene composites, Journal of Hazardous Materials 217-218 (2012) 256-262
[7] Mohammad Reza Saeb, Hadi Ramezani-Dakhel, Raha Sarami, Improving Thermo-mechanical Properties of Styrene Butadiene RubberNanocomposites Using Eggshell Bio-filler, 2010 Fourth International Conference on Quantum, Nano and Micro Technologies, 10-13
Online since: December 2011
Authors: Abel Cherouat, Ali Zghal, Mohamed Toumi Nasri, Slimani Faouzi, A. Ayadi, Mohamed Ali Rezgui
Inverse methods offer a powerful tool for the identification of elasto-plastic material properties of metals.
The impact factor is a parameter or a group of behavior model parameters proposed for identification.
The coefficients (, and γ) characterizing the ductile damage were made for influence factors.
The coefficients K, n, ε0 and friction f have been considered as influence factors.
Feasibility in deep drawing: optimization of material properties using response surface.
Online since: May 2011
Authors: Xiu Guang Song, Si Feng Zhang, Yan Mei Li, Jian Zhou, Jian Cui
The mechanical properties for the rock and soil mass achieved by the tangential and normal bond among particles.
For more accurate understanding of the mechanical properties of the interface, 110 measurement circles are arranged in the numerical model(as shown in figure 2).
The y-stress presents an exponential form distribution along the radial direction of anchor, which shows that tensile load spread through the grout in a small range, the affected area is only distributed in a smaller radius.
With the same method mentioned above, a series of measurement circles were arranged in the model to study the mechanical properties and micro-displacement of the soil between the anchors, just as shown in figure 12.
This superposition of tensile stress is very bad for mechanical properties of anchorage root, because the overall shear failure is prone.
Online since: April 2019
Authors: Emmanuel Iwuoha, Munyao Joshua Sila, Michira Immaculate Nyambura, Deborah Atieno Abong’o, Francis B. Mwaura
Their optical, electrical, magnetic, physical and chemical properties differ significantly from those of bulk materials [2].
Various factors are known to influence nanoparticles synthesis.
Beyond a silver nitrate to plant extract ratio of 4:1 probably other factors like site saturation would explain why AgNPs production at higher ratios would be lower.
Pileni, Magnetic Fluids, Fabrication, Magnetic Properties, and Organization of Nanocrystals, Adv.
Mumper, Plant phenolics: extraction, analysis and their antioxidant and anticancer properties, Molecules (2010) 7320-7330
Online since: February 2013
Authors: Yue Jun Li, Lan Gui, Zeng Guang Li
This type of soil is classified as low liquid-limit clay, of which the basic physical and mechanical properties are listed in Table 1.
Table 1 Basic physical and mechanical properties of selected soil PH Value Liquid limit (%) Plastic limit (%) Plasticity index Maximum dry density (g/cm3) Optimum water content (%) 6.9 39.9 20.8 19.1 1.673 18.1% (2) Curing agent: TerraZyme is classified as a kind of soil solidification agent of bio-enzyme.
Field tests of TerraZyme solidification soil In order to examine the road performance of TerraZyme solidification soil and validate the application feasibility of TerraZyme solidification soil in road construction practice, the 3 km test road was constructed to examine the effect factors on construction quality and service performance of TerraZyme solidification soil.
Fig. 14 Statistical diagram of compaction degree and frequency Effect of site rolling times on compaction degree Compaction degree is the key factor which affects the strength and stability of subgrade.
Study on the Properties of Roads about EN-1 Soil Condensate [D].
Online since: November 2012
Authors: Li Li Wang
Industrial design is the source and one of the core impetus of manufacturing industry’s competitive power, it has a direct affect on manufacturing technology as well as the brand construction, especially the automotive design, which as the senior stage of industrial design.
In recent years, automobile OEMs in Wuhan are beginning to create their own brands, developing proprietary intellectual property rights, but because of the mechanism, host plants haven’t invested enough for design, and don’t spend much on cultivating the designer team, core designs are still bought from abroad.
In general, because of regional, traditional manufacturing constraints and other factors, industrial design sense is not popular yet applied to manufacturing industry in Wuhan, enterprises and the public know little about the industrial design, the industrial design is not optimistic in Wuhan which is the representative city in the central area.
Facing with this problem, Zhao Bo who is the industrial design director of electrical and mechanical institute in Qingdao University believes : there is only a few the official industrial design competitions, mostly are folk organizations, hoping that national authoritative competitions can be held in order to promote the development of industrial design industry.
Online since: September 2008
Authors: Dan M. Marom
The components supporting optical networks can be realized by combining clever optical microsystems with micro-electro-mechanical-system (MEMS) actuators.
Mirrors can be introduced to fold the propagation length between the input and output fiber arrays, resulting in a more compact switch form factor.
The 1×K WSS module, which can be used to construct an equivalent K×K WSXC, is more robust solution as the traffic is partitioned according to originating fiber port, and only a subset of the traffic will be affected by a single failure.
The second subassembly introduces the desired wavelength-selectivity property with the use of a diffraction grating.
Switching is performed by a high fill-factor array of tilting mirrors. a separate mirror in the array for independent addressing.
Online since: September 2011
Authors: Xiao Dun Wang, Zhi Hua Chen, Qian Zhang
The special function or property can be imitated and applied in building’s function, this can be called functional bionics.
The heads of sunflowers can rotate with the moving of the sun; the leaves of some plants grow around the stem with spiral shape [3], all these properties make plants absorb the maximal sun’s heat to do photosynthesis and maintain the growth of its own.
The location of the first bifurcation point of the trunk of the tree, the ratio of the upper and lower bifurcation, the number of branch at the same point, the angle of each branch; when the storm started some trees collapse at the first blow, while others hold up; when the wind and rain started some branch broke off the tree, while others are unaffected; all these factors affect trees’ height, the lush level of the branches and leaves and the ability of resisting disaster at the same grow condition.
If we use the growth method of tree to find form of structure, the structure will exhibit better mechanical property under load to reduce the harmful effects of disaster on the structure, protect our lives and property.
Online since: January 2022
Authors: Khairul Nizar Ismail, Nur Afifah Mohd Khairuddin, Fathin Elliana Ja'afar, Sukhairi Ahmad
The objectives was to analyze the effect of different amount of gypsum in ordinary Portland cement, to study the physical and mechanical properties of clinker and gypsum and to compare the compressive strength of mortar with different amount of gypsum.
Physical properties also were obtained in this research such as specific gravity.
Too much amount of gypsum will affect setting time of mortar.
Specific gravity, which is similar to density and viscosity, is an important property for cement.
It is one of the factors that influence cement density.
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