Search results

Grain coarsening is an obvious reason of increase in thermal conductivity, because it reduces the effect of phonon scattering.
Usually, one of them is characterized by less number of cations (Yb, Sc), and the second with more number of cations (Sm, Nd, Gd) [11, 12].
It can be stated that the thermal diffusivity of an inter-layer is higher than the diffusivity of the base alloy, which is an effect of the presence of a lower number of alloy components.

Coarse aggregate: gravel, size of grain is continuous and between 5 and 25.
Table 3 Mixture ratio and material usage about C55 concrete [ kg/m3 ] Number Water-Binder ratio Cement Fly ash Sand Stone Water water reducer 1 0.32 350 150 (30%) 626.4 1113.6 160 4 2 0.32 325 175 (35%) 626.4 1113.6 160 4 3 0.32 300 200 (40%) 626.4 1113.6 160 4 4 0.32 275 225 (45%) 626.4 1113.6 160 4 5 0.32 250 250 (50%) 626.4 1113.6 160 4 Note: The fly ash how to replace the cement equivalently were shown in brackets Experimental methods and procedures In the light of the requirements of frost resistance performance of concrete in the railway engineering and “supplemental standard on the rail concrete engineering construction quality acceptance” Rail Construction [2005] No. 160, the age of concrete test blocks was 56 days in the test.
Simultaneously, the weight loss rate also increased with the increase in fly ash content under the condition of equal number of freeze-thaw cycles.
Through the above three effects, the microscopic performances of concrete micro-pore structure were better than normal concrete, either the number of pore or the graduation of pore.

The cement is ordinary Portland cement of P32.5, the fineness modulus of natural medium sand is 2.70, the grain composition of basalt cobble is 5mm-10mm, 10mm-20mm, 20mm-40mm.
Table 1 Size and Number of Specimens [mm] Label Size (2W×h×t) Precrack (a) a/h Number A60-1~8 400×300×150 60 0.2 8 B60-1~8 300×300×150 60 0.2 8 C60-1~8 500×300×150 60 0.2 8 D40-1~8 400×200×150 40 0.2 8 E80-1~8 400×400×150 80 0.2 8 Note: In Label of A60-1, A stands for size of 400×300×150, 60 stands for the length of precrack, -1 stands for the serial number in this group.

In order to make sure that the FEA mesh used during simulation of SWZNTs is optimal, a convergence study was carried out to determine the exact number of elements most suitable.
Based on the criteria set and result shown in Table 2, the number of divisions per element selected is 5 for optimum simulation taking in to consideration the computing capability available.
Also, comparing different structural groups indicates that increasing the number of atomic networks of structures leads to an increase in bending rigidity.
Journal of Ultrafine Grained and Nanostructured Materials, vol. 46, no. 1 (2013) 1-9

(2) In the course of the study, the influence of the number of GA, the presence and number of SP, the ratio of S / C, the size of the aggregate and the W / C in the first stage of expansion of the mixture was studied.
According to the number of joint ventures, the optimum value is 0.43% C, the modulus of aggregate size is 2.2.
Increase in the amount of gas-forming additive from 0.13 to 0.44% of the mass of C, at a dosage of the SP from 0.14 to 0.86%, depending on the aggregate size modulus in the range from 1.2 to 2.8 with the ratio S / C from 0 to 2.4, the values of W / C from 0.37 to 0.42 increase in the volume of fine-grained concrete mixture in the first stage of expansion varies from 6 to 64%.

Each peak was measured using XRD and assigned by comparing them with the peaks in the data provided by the joint committee on powder diffraction standards (PDF numbers: 20-1323 and 33-1387) [15].
Micrographs show tiny grains on the surface of the as-deposited (non-annealed) WO3 thin films (Fig. 2).
The WO3 thin films annealed at 200 oC had a triclinic crystalline structure in comparison with the JCPDS data (PDF number: 20-1323).
The WO3 thin films annealed at 500 oC had a triclinic/hexagonal phase that co-existed with the JCPDS data (PDF numbers: 20-1323 and 33-1387).

A characteristic behavior can occur with cations with coordination number higher than four, such as those generally present in the galvanic wastes.
The silica powder, given its very fine grain size, is considered harmful to human and animal health; the GW, mostly due to its chemical characteristics, has also been classified as environmentally very hazardous solid waste.
One possibility is that the metal oxides bond with two or more NBOs, i.e. the GW metal oxides promote "bridges" between NBOs, thus reducing the number of terminal points in the random glass network.
The main reason for the improved chemical resistance is probably the smaller number of terminal points.

The grain size of powder is 500~400 μm and the size of abrasive particle is 40-28 μm. [5].
The 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 BEFORE246810 number of strokes(회) burr hight(m m ) MI-4 MI-5 Fig .4 Comparison of MI-4 & MI-5 according to the number of strokes 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 50 100 150 200 feed burr hight(mm) before 2strokes 4strokes 6strokes 8strokes 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 200400600800 1000 1200 1400 RPM burr hight(mm) before MI-4 MI-5 (a) (b) Fig .5 Burr heights according to the change of (a) feed rate (m/min) and (b) RPM height of the burr on curved surface is difficult to be measured.
However when working gap is his means that the proper gap distance must be found carefully in every deburring process with different inductor and powder. 0 0.5 1 1.5 2 2.5 3 3.5 4 before 2 4 6 8 number of strokes( 회) Ra(um) coolant not used coolant used Fig .8 Variation of surface roughness according to the use of coolant (a) (b) Fig .9 The result of deburring by (a) one direction rotation (b) both direction rotation Fig.11 Deburring result and the measurement according to the operation time (6) Changes of power during deburring.

Relevant data show that the number of newly started highway projects in our country reached 111 in the first half of 2009, with the construction mileage reached 12 000 km and the total investment will reach about 700 billion Yuan.
Freeways have been built in China have reached 75 000 km by the end of June of 2009.[1] The results obtained by investigation of domestic freeways show that the pavement appeared large numbers of cracks one or two years after it was open to traffic, and the highest cracking rate reached 640m/1000m2.
The Formation and expansion law of Semi-rigid asphalt pavement reflection cracks A large number of studies have shown that the emergence and development of reflective cracking is caused by the base movement (dislocation), and these moves are primarily originated from the temperature changes, moving vehicles and the combined effects of both.
Pavement structure and its parameters refer to the actual pavement structure of Zhumadian-Luohe section in Beijing-Zhuhai highway, structural form: AK-16A type of medium-grained asphalt concrete thickness 4cm, AC-25I-based coarse asphalt concrete thickness 5cm, AC-30I-based coarse asphalt concrete thickness 7cm, cement stabilized crushed stone layer thickness 20cm (actual thickness: 40cm), cement lime stabilized soil thickness 36cm, the total thickness is72cm, shown in Fig. 1.

Infrared spectra of the samples were recorded on a Perkin Elmer instrument over a range of wave number 400-4000 cm-1.
In case of hydrogen bonded urethanes, -NH and C=O appears at lower wave number as compared to the bands appear without hydrogen bonding.
Conversely, for the HTPB based PU polymer, both peaks appear at higher wave number indicating complete absence of the hydrogen bonding in this polymer.
For the composite with CO based polymer, appreciable particle pull out can be observed and some of it is significant involving many grains.