The formation mechanism of twinning and defects in He+/H+ ion implanted z-cut and x-cut KTP samples are studied. A series of parallel linear defects observed on the surface of ion-implanted z-cut KTP samples is related to twinning boundaries formed in the KTP structure. The implanted He+/H+ ions tend to aggregate along these twinning boundaries that are normally parallel to a (100) plane and perpendicular to an x-axis direction, where K atoms are loosely bonded. The lattice between twinning boundaries is tilted at some angle to the rest of the crystal. Implanted He+/H+ ions and target K atoms are sensitive to temperature change, and diffuse easily along z-axis in stagger paths when temperature is elevated. Various implantation parameters are employed, including different ion fluences and beam current densities, with an aim to find the optimum condition for KTP thin film exfoliation. It is found that the temperature window for layer splitting of KTP samples is small and low, and implanted He+ ions are more likely to aggregate into bubbles or cracks that layer splitting requires when implantation is performed along x-axis.
An improved JSHOP2 planner integrated with robot task planning is built to solve the service robot multi-tasks planning. Firstly, service tasks are classified and assigned priority through comparing the characteristics of the tasks and considering the service needs level of users. Then, the optimization of tasks according to priority level can be realized by the proposed improved JSHOP2 planner. The simulation results show that compared with original JSHOP2 planner, this improved JSHOP2 planner can realize multi-tasks optimization and generate plans which are more likely to be satisfied by users.
This paper presents an application that combine the human location information and human activity in the intelligent space. Two AHRS modules have been utilized for getting the human information. On one hand, the AHRS module on the waist has been used for location tracking indoor accurately. On the other hand, the AHRS module of the arm based on the GMM algorithm has to perform activity recognition simultaneously. The proposed method considers the utilization of wearable sensors, AHRS modules, which can provide the human's information in an intelligent environment. In addition, some special activities we defined have been used for amending the human position so that the mutual compensation of position tracking and activity recognition is obtained in the system. In this paper, the daily performance is discussed and the experiments are performed. The experimental results are shown that the accuracy of the system is more than 98% in an comfortable and convenient way.
A new (lambda) T relation of blackbody for optimizing the efficiency of production of radiation was derived by use of Gauss-laguerre method. We have given the experimental investigation of the new relation of blackbody relation and discussed its application.
Er-doped KTiOPO4 films on different substrates were made by pulsed-laser deposition. Substrates included Al2O3, MgO, and KTiOPO4. Both KTiOPO4 and erbium were used as targets. The composition of the Er-doped KTiOPO4 films on the different substrates was analyzed by Rutherford backscattering with 2.1 MeV He2+. The results show that there is deficiency of K and P in the deposited KTiOPO4 film on the different substrates. The prism coupling method was used to determine the relative intensity of scattered light versus the effective refractive index. The measurement indicates that there are waveguide structures in all cases.
The plasma-transferred arc technology has been observed to induce preferential grain orientation in multiple directions, leading to nonuniform grain growth within the alloy coating material. The addition of nano-oxides can act as heterogeneous nucleation sites, reducing the preferred orientation of grains. In this study, a low-speed mixing method was employed to coat highly dispersed CeO2 nanorods (CNRs) onto the surface of 14Cr2NiSiVMn alloy powder particles. The aim was to analyze the influence of dispersed CNRs on grain growth orientation in different directions and the refinement and heterogeneous nucleation effect of CNR additives. The addition of 0.5 wt.% CNRs resulted in the refinement of dendritic grains along both the perpendicular and parallel directions to the coating cladding direction, leading to the formation of more uniform equiaxed crystals. The combination of Ce with Si and V elements formed submicron particles, which promoted grain nucleation and reduced defects in the coating. Consequently, the mechanical performance of the sample significantly improved. In the deposition direction, there was a notable improvement in microhardness (20.4%), tensile strength (97.6%), and elongation (59.0%). In the perpendicular deposition direction, the tensile strength increased by 88.1%, and the elongation increased by 33.9%. Additionally, the weight loss due to wear decreased by 44.2%, and the relative wear resistance improved by 79.3%.
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