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All the factors which contributed to the degradation of the roof structures and created a hazard of their collapse are examined.
Moreover, the parts of the truss were biologically affected by timber pests to a depth of at least 5 cm.
As part of the analysis of roof behaviour aimed at developing a proper rehabilitation programme, the roof structures were tested in order to determine some of the physical and mechanical properties of the wood in the ceilings and to specify the standard wood strength parameters to be adopted in the final static and numerical analyses.
Conclusions The life of timber structures depends on many factors, including their deterioration level, their service conditions, the expertise of the restorer and the range and effectiveness of the restoration measures.
Determination of some physical and mechanical properties [in Polish]

Fillers play important roles in modifying desirable properties of polymer due to their interesting electrical, mechanical and also electronic properties.
The dispersion of the TiO2 may be affected by many factors.
One of the main factors is hydrogen bonding which is necessary to avoid the agglomeration in the thin film.
Chatterjee, Optoelectronic properties of Ge-doped TiO2 nanoparticles, A.
[6] Chatterjee, Properties improvement of PMMA using nano TiO2, A.

Study on Leaning Sensing Device Based on Kerosene Ferrofluid Hairong Cui Ningbo University of Technology, School of Mechanical Engineering, Ningbo 315016, China hairongcui@sina.com Keywords: Leaning sensing, Ferrofluid, Property Abstract.
Moreover, the physical properties of ferrofluid is affected and controlled by external magnetic field.
It is also found that output voltage is affected by several influencing factors such as the properties of ferrofluid which is a key parameter for viscosity and magnetization, volume of ferrofluid, winding number and diameter of coils, structure of tube and so on.
The properties of kerosene based ferrofluid used as a leaning sensing device should be characterized by high magnetism, good fluidity and proper viscosity.
So how to prepare proper kerosene ferrofluid which has proper magnetic and streaming property is key factor of establishing the experiment of leaning sensing device based ferrofluid.

By analyzing the working principle and characteristics of the piezoelectric cantilever beam pump, we developed the dynamics model and FEA model of the piezoelectric cantilever beam and optimized through tests the main factors that affect the output flow of the piezoelectric cantilever pump.
The advantages of the piezoelectric pump are its simple structure, low energy consumption, and small size, which give it an obvious edge over the traditional mechanical pump regarding transporting fluid in the field of biomedicine [4], fine chemistry [5], and pharmaceutical research [6].
Additionally, ; so the mechanical properties can be regarded as isotropic.
The reason is that the stiffness of the cantilever beam is in inverse proportion to its length, so as the stiffness of the whole mechanical system, which, as a result, causes a lower resonance frequency.
Affected by the stiffness and damping of the diaphragm, the overlong cantilever beam and piezoelectric patches struck to the fixed end cause the moving backward of the maximum output displacement, not along the vibration rod.

The key factors involved in the train derailment on bridges or lines have been discussed in this paper.
Mechanical mechanism of train derailment.
The mechanical mechanism of train derailment on railway bridges has been discussed in detail in [10].
Under its influence, the Baoji Railway Station train delays, about more than 1300 passengers affected.
[2] Grob J, Dynamics property of train after derailment, J.Bauingenieur, 68 (1993)501-507

Owing to its superior high temperature mechanical properties such as good stability, high strength and ductility, etc., it has been widely applied for the parts in aerospace industry, turbine outer ring and seal ring.
But the combined effects of poor thermal properties, high temperature strength, tendency to severe work hardening, and high tool-workpiece affinity make it difficult to machine iron-based alloys [1].
The type and properties of the tool material are given in Table 2 [9].
The main influence factors in chipping are the size and the length of micro-crack and the orientation and the location of the cutting force acting on the ceramic tool.
These factors cause tool wear, which would affect tool life, the quality of the machined surface and its geometric accuracy.

OPFB filler and matrix play an important role in determining the mechanical properties of its composites.
Thus this study was done as an attempt to improve the mechanical properties of OPFB fibre filled plastic by adding mineral filler or clay in the matrix.
Effect Of MAPP as Coupling Agent on The Mechanical Properties of Palm Fiber Empty Fruit Bunch and Cellulose Polypropylene Biocomposites.
Wu, Thermal and mechanical properties of wood flour/talc-filled Polylactic acid composites: Effect of filler content and coupling treatment.
Bledzki, Mechanical properties and environmental stress cracking resistance of rubber toughened polyester/kenaf composite.

The figure1 shows the two main aspects and factors of influence.
These parameters control certain machining conditions and can cause the phenomena between the process and the product, such as: high temperatures, surface chemical reaction, density of energy, residual stress and surface mechanical or metallurgical properties modification.
Nevertheless this technique also allows the identification of significant factors of a process and their optimal levels.
The dielectric properties for the fluids used are described in table 2.
These factors are: 1.

In addition, the testing of indentation diameter is the most important factor of measuring accuracy, the material heterogeneity and surface condition under different manufacturing process conditions will seriously affect the measurement results.
The theory of using indentation test to determine the mechanical properties of materials was then gradually improved.
The linear relationship between residual stress and strain increment relates with the steel material, surface condition, ball diameter, the strain gage size, distance between strain gage and ball center, impact energy, static pressure and other factors.
New type of SSM for residual stress determination In resent years, more and more attention has been paid on material microstructure and properties, due to the rapid development of new materials technology.
Therefore pressure deep can be controlled as small as nanometer (0.1nm~100nm), which is appropriate for the ultra-thin material properties test [14].

Some factors affecting the formation of a heat island are the intensive use of asphalt and diverse construction materials, mainly concrete [1].
The physical properties of BA include specific gravity 2.3 g/cm3.
Results and discussion Physical properties Fig. 1 shows the water absorption and volume of water retention for various blocks.
Mechanical property - compressive strength Compressive strengths decreased with decreasing the size of aggregate in the blocks.
Environmental properties Using the contaminated rainwater form real roadway, the removal of pollutants by the NPPB was examined.