Search results

There are a number of compelling motivations for the study of these exotic materials.
Using periodic approximants allows access to the DFT methodology which is applicable to periodic systems; the number of atoms in the models is restricted to manageable numbers by carefully choosing the order of the approximant and the size of the slab under consideration.
This number is too large for the calculations to be feasible.
Studies of other surfaces are few in number.
The number of reports of studies of the clean surfaces of giant unit cell materials looks set to increase.

The mechanisms of defect formation, migration and annealing at the atomic scale, ranging from grain boundaries, dislocations, single atomic and cluster vacancies to nanoscale voids and surface effects, are fundamental to understanding material properties and functionalities by modifying their electrical, mechanical, dielectric and magnetic properties.
One should keep in mind, that higher atomic numbers of the projectile as well as for the target nuclei result in higher Coulomb-barriers and thus increasing the necessary beam energy.
Moreover, the half-life of heavier daughter nuclides tends to increase for higher atomic numbers, again given by the repulsive Coulomb-barrier, but now the one for b+-emission.
Additionally, lower decay energies and higher atomic numbers favor b+-decay over electron capture.
Since the atomic mass roughly scales with Z, the radiation length scales approximately with the inverse atomic number.

The experiment uses three kind of structure types to carry on the contrast, the load supposes the spare wheel rut tester, the wheel-pressure is 0.7MPa, the roller compaction speed is 42 /min, the experimental temperature for 60℃, uses the brae bed reflection crack development highly along with the load function number of times relations for the experiment evaluating indicator.
Table 11 Anti-reflective cracking simulation test structure type Scheme Numbers Pavement structure types Structure total ply/cm Ⅰ 5cm AC13 Asphalt concrete+ C30 Concrete Slab 10 Ⅱ 5cm AC13 Asphalt concrete + Fiberglass grid+ C30 Concrete Slab 10 Ⅲ 5cm AC13（0.4%RK300）Asphalt concrete+C30 Concrete Slab 10 Uses the eccentric loading.
Fig. 3 Central Load Fig. 4 Eccentric Load Fig. 5 Scale map of reflective cracking in asphalt layer Under the non-central load function, observes each kind to spread separately the structure reflection crack at the beginning of crack, to expand to 1cm, 2cm, 3cm and finally the cracking number of times, finally see Table 12.
Table 12 Eccentric loading endurance test result Scheme Numbers Pavement structure types Crack propagation into different scale when fatigue times/times Initial crack 1cm 2cm 3cm Finally cracked Ⅰ 5cmAC13 Asphalt concrete+5cm Concrete Slab 1120 3248 6510 9290 10012 Ⅱ 5cm Asphalt concrete +Fiberglass grid+5cm Concrete Slab 1848 4284 7434 12138 14212 Ⅲ 5cmAC13（0.4%RK300）Asphalt concrete +C30 Concrete Slab 2781 5423 9876 13356 17808 It was found, for the program Ⅰ, when the eccentric load to 1120 the number of times, cement concrete cracks at the seams along the bottom gradually expanded, cracks extended upward along the vertical direction basically, but some small cracks in the development of the both sides of the diagonal, when the crack extended to 3cm scale cracks developed rapidly, when the load times to 10012 times, the asphalt layer completely broken.
PlanⅡ Asphalt concrete crack law of development is similar to planⅠ, When the non-central load function number of times is 1848 Brea bed bases starts to present the small crack, but crack to load function one side diagonal expansion, The expansion process is slow, when the load function number of times achieves 14212 times, the Brea bed breaks completely, this time tries the wheel to walk one side Bolivia filament grill and the concrete slab has the length to withdraw the phenomenon.

It has also been documented that applying ultrasonic or mechanical vibration to a solidifying melt can lead to grain refinement of the alloy and formation of a non-dendritic and globular structure [13, 14].
For image processing, a total number of 100 randomly selected particles were analyzed in a total measured area of 300 mm2 per specimen.
A number of these nuclei are detached from the surface as a result of applying shear stress and are distributed into the melt to generate a large number of refined primary Mg2Si particles.
Therefore the number of nuclei suspended in the molten alloy entering the mold cavity is increased and consequently the size of Mg2Si particles is decreased.
The number of the seed crystals and the extent of the shear stress applied on them are therefore affected by the vibration action.

Based on the image, the selection of an appropriate number of magnetrons corresponding to the defects to heat can be made.
Two steps algorithm was adopted: first, transformation of grayscale image into binary image by thresholding algorithm is conducted and second, through region growing, the defect pixels are gathered together and grain noise pixels in background are eliminated.
The number of grids equals to the magnetrons' number.
For one thing, the manual is unrestricted with the number and location of the defects.
Because the limited number of pins of MCU has to manipulate a large number of magnetrons, some signal latching components are used.

And then utilization of the arc-discharge process for the vaporization of graphite electrodes demonstrated that it was possible to produce fullerene molecules and serendipitous a large number of other closed hollow carbon structures in macroscopic quantities [2-3].
The mixed precursors are consisted of a certain mole number and proportion agents.The selected crude carbamide dissolved in solvent and reacted with metal nitrates to get the metal complexes, and then added the anhydrous alcohol and PETN/RDX into the mixture.
Well crytallized bcc-Fe, fcc-Co and fcc-Ninanocrystal were encapsulated in graphitic carbon with perfect core/shell structure and with a grain size in the range of 10-20nm.The nanosize iron particles showed strong XRD peaksand exhibited ferromagnetism and superparamagnetism.

The sample used in the test was Al2024/SiC/45p, which is Al2024 alloy reinforced by 45% SiC particles with grain diameter of about 5 μm.
The definition of the loss function (L) for machining performance results yi of n repeated number is: (1) The S/N ratio for the ith performance characteristic in the jth experiment can be expressed as: HB=η=-10lgVT (2) Fig. 1 Taguchi design method process Table 3 Experimental design and results using L9 orthogonal array Exp.
Further more, as grind wheel speed keeping on increasing the number of grits through the contact area per unit time increased.

Cellulose molecules can be expressed as the simple (C6H10O5) n, n (n = 3000-10000) for the degree of polymerization,being the number of cellulose units.
Low degree of polymerization, the sugar unit number in 60-200, arrangement loose, and no crystal structure, these facters make hemicellulose hydrolyze easily.
Sugarcane molasses leaching local oxidation manganese ore process in Su,s research[13], the result showed that leaching 97% of manganese and iron and aluminum leaching rate of only 32.4% and 21.5% when the reaction conditions are as follow: 90 ˚C, mineral grain size being less than 0.147 mm, 60 g•L-1sugarcane molasses, 1.9 mol•L-1acid,and 120 min.

This process, while being expensive to implement due to high tooling and raw material costs, saves a significant amount of money over the life of an airplane program due to greatly reducing the number of detail parts, which reduces the amount of expensive assembly that is required.
The process will be used to reduce part count as well as the number of fasteners, assembly time, and weight all of which leads to cost savings for the product.
Once the individual grains on the surface touch each other, they start growing across the interface of the two sheets.

On the surface of the alloy with silicon and REE smaller number of cracks were observed than on the surface of the base alloy and an alloy with silicon, cracks were shorter.
Grain boundaries are places with increased internal energy, which determines their lower resistance to corrosive environments.
It is easier to remove atoms less bounded with neighbours (with a lower coordination number) that is located on the edges of the crystallites and inter-crystalline areas.