Search results

In order to reveal the the performance of full-length pre-stressed anchor bolts, and research the rock pressure behavior law, a combination method of FLAC3D and situ tests were presented, the conclusions were drawn as following: the prestress of full-length pre-stressed anchor bolt was approximately uniform distribution along the slow anchoring section of the rod, while in the fast anchoringthe segment showed a negative exponential or linear form of attenuation, and the bolt axial load was biggest in the neutral point; the neutral point of full-length pre-stressed anchor bolt move to deeper of the drill hole with the reduction of rock strength, while neutral point shifting deeper would accelerate the destruction of the anchorage zone in deep rock formations, deteriorating the anchoring effect. the methods of pre-grouting and grouting bolt (or cable)should be taken to improve the anchoring force.
Bolt neutral point in siltstone is 100mm from the bolt tail, indicating that the neutral point of the highly prestressed bolt moves deeply to the surrounding rock as the rock strength reduction.
The monitoring data of 1 # and 2 # anchor showes that the prestress of the full-length pre-stressed bolts is approximately uniform distribution along the slow anchoring section of the rod, while it showes a trend of gradual decay in the fast anchoring section.
(2) The position of neutral point of the highly prestressed bolt moves deeply to the surrounding rock as the rock strength reduction, and the neutral point moving deeply will accelerate the destruction of the deep rock in the anchorage zone

The reduction of Jc with the applied magnetic field requires further improvements to reduce weak links.
These data show that the higher densification leads to higher values of Jc, due to higher density of pinning centers.
The magnetic field dependence of Jc is approximately exponential with field [9], and leads to a high reduction: For sample MB1-9, with highest Jc, 0.6x 10 6 A/cm2 at 0 Tesla, it reduces to 0.3x 10 6 A/cm 2 at 1 Tesla and to 0.11 x 10 6 A/cm2 at 2 Tesla.
This reduction is comparable to the one found in other studies and shows that improvements have still to be done in the materials processing in order to reduce the weak links.

The article summarized the ball screw causes of the vibration, noise, comprehensive both at home and abroad research results to the ball screw vibration and noise generating mechanism .Then pointed out that the ball screw noise generation is the main reason of the screw groove waveness arouses nut forced vibration.Introduced the latest progress of the ball screw drive system modeling and the vibration model analysis,specific introduces several methods of reducing vibration and noise reduction.
Antivibration and Noise Reduction Method (1) Improve the precision of the ball screw The ball screw precision shortage is the most important factor in the reason of generates noise, and inevitable happened in the mechanical processing.
For the selected ball screws, have data show that the noise level is in proportion with dN values (d is ball rail center diameter, N is rotation number) of the logarithm, so we should the choice the lower value of the dN.
(6) Other noise reduction measures Mainly includes to ball nuts surrounding configuration noise casing; Outside of intubations fixed high strength engineering plastic and will guide bead tube covered completely exposed portion; In the ball screw shaft trip ends configuration buffer shock absorbers.

If no other comment is given the data relate to the height of the pedestrian zone (0.8 m above the pavement).
The reduction of the velocity along the street axis is the consequence of the hydraulic resistance of the boundary surfaces.
The reduction of the velocity in Base scenario along the street axis is 2,5 m/s or 28% on 50 m length.
Along the street the reduction of the velocity is more radical in comparison with the empty variant.
The reduction of maximum values by 0,51 m/s The reduction of maximum values by 0,51 m/s crossroad There is still air (no ventilation) in the crossroad.

Manual investigation of analytical data for profiling studies is time-consuming, complicated and can be inefficient at times [21].
Various chemometric methodologies including principal component analysis (PCA) was efficiently used to compare and interpret profiling data promptly.
The impurity profiles were scrutinized using similar data analysis software and the compounds were identified based on previous literature, and the NIST library (version 2.0).
Total ion chromatograms (TIC) data matrix was normalised prior to PCA analysis.
Furthermore, the analytical data combined with statistics and machine learning model such as PCA has enabled objective interrogation for precursor origin study.

This reduction in rigidity of the structure requires innovative structural concepts and a stronger focus on aeroelastic deformations in the early design and optimisation of the aircraft structure.
Quinn [12] compared early computational models with experimental data, which at that time showed discrepancies in the thermal model.
Matlab® serves several purposes; an interface with the user, an automation of the data transfer and analysis runs and the driver of the aeroelastic iteration.
The tool is built around a Matlab® core program, which automates data transfer between software components in an optimisation loop.
III, “Hyper-X Hot Structures Comparison of Thermal Analysis and Flight Data,” Pasedena, CA, USA, 2004

The calculation results indicate that La substitution of the Al sites induces effective reduction of the band gap of AlN, and the band gap being continuously reduced when increasing La doping level.
Table1 Calculated lattice parameters of the optimized supercells Material a[Å] c[Å] c/a V[Å3] Exp Cal Exp Cal Exp Cal Cal AlN 3.112 3.131 4.981 5.017 1.601 1.602 340.70 Al0.9375La0.0625N / 3.182 / 5.127 / 1.611 359.61 Al0.875La0.125N / 3.228 / 5.269 / 1.633 380.74 Al0.8125La0.1875N / 3.312 / 5.319 / 1.606 402.50 According to the data summarized in Table 1, as the concentration of La increasing, the lattice parameters of La-doped AlN a, c, V increase too.
The calculation results indicate that La substitution of the Al sites induces effective reduction of the band gap of AlN, and the band gap being continuously reduced when increasing La doping level.

The attenuation or deterioration of signals, arises from physical phenomena in transmission lines, limits achievable data rates and transmission distance.
In such severe environments, sophisticated pulse-shaping techniques such as equalization, preemphasis, need to be employed to increase the data rates [1].
The input data is XOR'ed with a pulse-width modulated clock in order to provide timedomain pre-emphasized data.
Yamamura, "Equalization techniques for multiple-valued data transmission and their application,'' IEEE Proc. 37th Int.
Takahashi, "Time-domain pre-emphasis techniques for equalization of multiple-valued data,'' IEEE Proc. 38th Int.

The results show that shading is the key strategy for improving outdoor thermal environment in Singapore because it leads to reduction on the air temperature and mean radiant temperature simultaneously.
It gives a large amount of output data including the necessary variables which are needed in calculating thermal comfort indices.
The simulation study was carried out on 27 April 2012 since it is the hottest day during the measurement period, according to meteorological data from Sentosa weather station near the study area.
The measured data from field measurement were compared with the result generated by ENVI-met simulation (base case).
The results show that shading is the key strategy for improving outdoor thermal environment in Singapore because it leads to reduction on the air temperature and mean radiant temperature simultaneously.

Shape of the curve at RT is similar to many reported data of ductile materials, i.e. elastic deformation, yielding, inflection point at the work-hardening stage, the slow Fig. 5 Micrographs of the recrystallized zones (whitely thermal-etched region) showing PZ0.02 (left hand side) and PZ0.12 (right hand side) in the specimens loaded at 77K to cc, ee…, gg in Fig. 2.
The thickness very near the fracture is from Fig. 4 0.28mm ( the thickness reduction is 44.6%).
The thickness near fracture is 0.43mm (the thickness reduction is 14.0%).
Although the fracture strain can not be estimated from only the thickness reduction, it is obvious that the ductility at 77K is much smaller than at RT.