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So far a number of sensors have been developed using SnO2[3,4] to detect VOC vapours and WO3 [6] and In doped SnO2[7] for NO2..
SnO2 nanostructure based sensors have been reported to show good sensitivity properties such as low detection limit, good selectivity, and short response and recovery time .The modification of structure and grain size or introducing an impurity level and surface defects in tin oxide through doping is an effective way to improve its gas sensing properties.

The value of the horizontal displacement of a light timber-framed wall, with four main components is calculated using the following equation [8]: (3) where: Δsh is the horizontal displacement due to the deformation of the sheeting to framing connections, in mm; Δh is the horizontal displacement due to the rigid-body rotation, in mm; Δa is the horizontal displacement due to the rigid-body translation, in mm; Δp is the horizontal displacement due to the shear deformation of the sheeting-panel, in mm; is a parameter related to the sheeting-panel dimensions; is the applied horizontal load, in N; is the fasteners spacing, in mm; is the wall length, in mm; is the number of braced sides of the wall; is the fasteners stiffness, in N/mm; is the height of the panel, in mm; is a parameter that accounts for the distance between the hold-downs, typically [0,9; 1]; is the hold-down stiffness, in N/mm; is the vertical distributed load, in N/mm; is the angle-brackets
The light timber-frames are executed from fir timber having C24 strength class and a main modulus of elasticity parallel to the grain direction, E0,mean = 11000 N/mm2.

The refinement procedure minimizes, by the least squares or maximum likelihood methods the function: M = iwi yobsi-ycalci2 Where wi =1σi is the weighting assigned to the observable yobsi (number of shots observed at step i) and σi is the standard deviation.
Structural analysis using RIETVELD method To determine the lattice parameters, the structure and the mean grains size of the powders, commercial HAP and b-TCP were used as standards.

The grain size, morphology and microstructure were observed by scanning electron microscope (SEM, JSM-5900, JEOL, Japan).
At the present stage, a number of OH- ions selectively adsorbed on different crystallographic planes.

The number of polymers directly related to cement particles and the features of their adsorption are studied.
[23] Rahman A, Singh A, Harimkar S.P., Singh R.P., Mechanical characterization of fine grained silicon carbide consolidated using polymer pyrolysis and spark plasma sintering.

He began to create with a collage technique, with a piece of newspaper expressing a bottle on the left and with grained paper representing a violin on the right, and then with a few lines of charcoal pen sketching collage of these disparate materials to form an organic unity of the body.
If the person encounters similar natural scenes or artworks again, he or she will feel the aesthetic pleasure due to the sensory correspondence The great European artist Beuys was the representative character of creating artworks with synthesized materials; He used a large number of materials of various textures to arbitrarily organize pictures, without the constraints of concrete forms, and to express emotions by sherry utilizing texture and composition.

The improvement in hydrogen permeability after annealing is attributable to the number of the percolation paths which could be highly sensitive to the intergranular separation between the neighbouring Nb grains.

The analysis of this research consists of three parts: firstly, it analyzes the integrity of ceramic materials in the process of RUM and the correlations between RUM and machining conditions through the results of axial sub-sectional measure in means and standard deviations of statistics; secondly, it discusses the machining parameters such as drill diameter, rotation speed of main shaft, power and feed rate which are the keys in the research in the condition that grain size is fixed; finally, it discusses the influences of Taguchi quality experimental design method on machining quality with the expectation achieving better and bigger MRR of holes wall to ensure the effectiveness after drilling and improve the machining efficiency.
Conclusions The following conclusions may be drawn based on experimental results above: 1.Relational equation of drilling holes wall on MRR and drilling parameters and tool geometry may be used to forecast holes wall quality. 2.When diameter is fixed, we can find greater MRR with larger rotation speed, power and feed rate. 3.Experimental planning based on OA of Taguchi Method has both advantages and disadvantages as follows: (1) to arrange the least number of experiment to attain the best experiment efficiency; (2) simple an d quick analysis; (3) it is a drawback which can not be used to analyze multiple objective.

In common machining, the fracture toughness usually depends on bulk properties, such as the domain strength and the grain boundaries.
A number of researchers have focused on metal surface deformation, and fracture mechanisms have been discussed at length.

The number-average (Mn) and weight-average (Mw) molecular weights of P3HT was 17,028 and 31,528, respectively.
The microwave-annealed film also showed increased grain size with an rms value of 0.63 nm.