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Countsum / Scovered: It’s the number of sensor nodes in unit area.
When the number of node is more than two at the set of the Sch, the node is a boundary point.
When the number of node is more than two at the set of Sch, the node is a boundary point.
The number of nodes deployed in every experiment is 10, 20, 40, 80 respectively.
[2] Elson J, Girod L, Estrin D: Fine-grained network time synchronization using reference broadcasts.

Number: 1.0976.
Pure titanium powder with the ~70 µm grain size was blown into the melted substrate under the angle of 45° using argon as carrier gas.
(Increasing sequence numbers 4,6,8,10), the length of the scale bars are 2 mm Figure 4.
Light microscopy images of sample number 4b/3 with the hardness results Figure 5.
Three different structures can be distinguished in both pictures: a homogeneous solid-solution type marked with number 3, a dark fine globular or equiaxial dendrite with high Ti content marked with number 2, and a two phase structure most likely eutectic or eutectoid marked with number 1.

Use block molding, vibrating close-grained, after 24h bosses.
The main purpose of this study is to establish the surplus compressive strength and fatigue cyclic number relationship (except for special instructions,this article mentioned in the residual strength shall mean residual static load strength).
Table 3 Corrosion residual strength of concrete Numbers number specimens 2 specimens 3 specimens 1 AVG Not corrosion 7000 33．6 29．5 29．8 31．0 sodium 6000 29．0 30．9 25．9 28．6 Data processing Because by fatigue corrode the influencing factors of concrete is more, Formula should not too complicated, minimize parameters to ensure the accuracy of the calculation, So this article selects the residual strength model formula is [7]: (1) In the type, is fatigue times of concrete fatigue residual strength; is fatigue maximum stress;is fatigue life; is fatigue stress level for relevant constant.
According to the formula (2) to (3),We can be calculated when the number of different fatigue residual strength of concrete.
In practical engineering, Sulfuric acid root ion on concrete corrosion should not ignore, should consider the corresponding protective measures, to ensure the project can achieve the desired use fixed number of year.

Further, its strength can be improved by cold working, refinement of grains, precipitation and dispersion hardening.
When the precipitates are finer and more in number (lower aging temperature and peak aged condition), bypassing of dislocations through precipitates becomes complex and difficult through Orowan’s mechanism.

TRC [1, 2] is a composite material consisting of a fine-grained UHPC matrix and textile glass fibres, known as AR-Glass.
This shortcoming was compensated for by making a calculation with an unlimited number of loading steps.

The crystallinity, the grain boundaries and the surface roughness depend critically on the irradiation process.
The SEM micrographs in Fig. 5a show the surface morphology with a granular structure that changes from densely packed crystal grains, characterized by visible grain boundaries with an average size between 25 and 100 nm in the as-grown film, to grains with less smooth and less distinct surfaces and boundaries after bombardment.
It is clear from these images that the grain morphology and roughness change as a result of irradiation with 5 keV H2+ ions.
In addition, the SEM cross-sectional images reveal less pronounced grain boundaries after the bombardment process, which can also be seen in the SEM surface images in Fig. 5a.
Acknowledgement The research leading to these results has received funding from the core fundings NPOO.C3.2.R2-I1.06.0083 supported by the European Union NextGenerationEU and project numbers 23-190 and 23-4 supported by the University of Rijeka References [1] R.

The anodic dissolution mechanism is that the local plastic deformation develops to a critical state due to corrosion, and the stress concentration in the local region is equal to the atomic bonding force, resulting in the nucleation of micro-cracks, which then expand in cleavage or along the grain boundary, resulting in low stress brittle fracture.
A large number of studies have shown that the addition of precious metal elements Pd, Ru and Mo can significantly improve the stress corrosion resistance of titanium alloys [13, 14].
In addition, the strength and toughness of titanium alloy can be improved by adjusting the miro-structure the grain size of the titanium alloy; the fracture toughness of titanium alloy is affected by secondary α2 Lamellae size and Ti3Al particles in nascent α grains.
Among them, secondary α lamella coarsening can improve the toughness of the titanium alloy, however, Ti3Al particles in nascent α grains can improve the strength of the material and reduce its toughness [27, 28]. the grain size of original β has little effect on the strength of aged titanium alloy, but the increase of grain size reduces the fracture toughness of titanium alloy; and the reduction of the aspect ratio of the α phase is beneficial to the improvement of the fracture toughness of titanium alloy [29].

In this region, the higher stress level the greater number of the test specimens show subsurface initiation of fatigue cracks; a similar fracture pattern is typical of the monotonically stretched specimens.
A number of investigations showed the position of the bifurcation zone Dqw2 to shift drastically because of the changed influence of the aggressive environment [15, 16].
(Here, we do not discuss metal defects or the grain boundary and phase boundary discontinuities.)
Such a fracture pattern showed itself in the case that the crack just initiated subsequently propagated throughout the group of grains, probably, close in their crystallographic orientation.
Around such an inclusion, a fine-grained structure forms in the area known as fine-granular area (FGA) and defined metallographically as the optically dark area (ODA) [1].

In addition to the above two problems, acquisited images suffer form speckle noise which is caused by the ultrasonic components reflected from the grain boundary of material[3,4].
Results of speckle noise removal of C-scan images 0 32 64 96 128 160 192 224 256 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 Voltage [mV] Sample Number 0 32 64 96 128 160 192 224 256 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Voltage [mV] Sample Number 0 32 64 96 128 160 192 224 256 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 Voltag [mV] Sample Number (a) (b) (c) 0 32 64 96 128 160 192 224 256 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Voltage [mV] Sample Number 0 32 64 96 128 160 192 224 256 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 Voltage [mV] Sample Number 0 32 64 96 128 160 192 224 256 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 Voltage [mV] Sample Number (d) (e) (f) 0 32 64 96 128 160 192 224 256 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 Voltage [mV] Sample Number 0 32 64 96 128 160 192 224 256 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Voltage [mV] Sample Number 0 32 64 96 128 160 192 224 256 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0
Voltage [mV] Sample Number (g) (h) (i) Fig. 7.

Effects of number of dipping and calcination temperature on optical and structural properties of TiO2 thin films are investigated.
The transmission of the thin films of titanium oxide decreases with the increase in annealing temperature and in the number of dippings.
Number of layers 300°C N 300°C Porosity 600°C n 600°C Porosity 1 layers 2.23 25.74 % 2.24 24.90 % 2 layers 2.16 31.48 % 2.23 25.74 % 3 layers 2.08 37.82 % 2.22 26.57 % Table 1: Refractive index and porosity of TiO2 thin films as a function of calcination temperature and number of dipping.
This value increases with the increase in the temperature treatment whereas it decreases with dippings number.
The influence of the number of dipping (film thickness) and the temperature treatment on Eg are investigated.