Abstract: The magneto-optical Kerr effect (MOKE) of ultrathin film grown on non-magnetic anisotropic substrate has been investigated. The formula of Longitude Magneto Optical Kerr effect for this structure is derived to find out the influence of the anisotropic substrate on the magneto optical properties of the sample. The change of Kerr rotation as a function of the incident angle is also given, which can be used to find a proper angle in sample measurement. Finally, a numerical simulation was carried out to find out the relation between Kerr rotation and optical properties of the anisotropic substrate which can be used to…select suitable substrate on which the film grows.
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Abstract: Coalition formation in multi-agent systems seeks to create efficient agents' alliances in order to perform complex tasks. The main objective of this paper is to measure the impact of the pursuit groups' formation on the capture of different evaders. In order to achieve this goal, we propose a coalition formation algorithm based on Agent-Group-Role organizational model (AGR). This organizational model is used as coordination mechanism with the aim of regrouping the agents in different groups and assigning the roles adequately. Also, we have used Markov Decision process principles (MDP) to control the motion strategies of our agents in the environment.…The achieved simulation results reveal the effectiveness of the given method.
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Abstract: In recent years humanoid robots have been widely used in toy, performance, education and other service industries, but most biped robots walk slowly and have poor stability. The reason is that the driver parameters of the robot cannot properly match the walking gait algorithm, and the insufficient performance of the robot driver leads to the poor motion capability of the robot. In this paper, the optimization design process of biped robot parameters is studied and expounded, and its motion capability is improved by optimizing the driving parameters of the robot. Firstly, the contradiction between walking speed, stability and driver performance…of biped robot is analysed. The performance evaluation functions of the three are further established, and the optimal parameter design to a certain extent is realized based on the multi-objective optimization method. Finally, combining with the physical simulation engine, the design parameters are simulated and checked, and the robot design process is completed through the guidance of simulation results.
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Keywords: Humanoid robot, inverted pendulum, multi objective optimization, constraint
Abstract: The laser Doppler flowmeter has become an effective tool for the clinical study of microcirculation with non-invasive measurements and excellent velocity resolution. Microcirculation flow measurements cannot be used as reference criteria for circulation function. Thus, the relative change in fingertip microcirculation was measured through inflation and deflation of an automatic sphygmomanometer wrapped around the arm, and the blood pressure and functional parameters of circulation, such as biological zero (BZ), peak flow (PF) and time to peak flow (tp ), were determined. For 50 healthy participants, the correlation coefficients for the laser Doppler flowmeter and oscillometric results were 0.950 and 0.838…for systolic and diastolic pressure, respectively. The mean and standard errors for both methods fell within the range specified in the Association for the Advancement of Medical Instrumentation standards. The BZ of an edema patient was about 5 times higher than normal. For patients with peripheral arterial occlusive disease (PAOD), the PF could not be determined, and the tp was about twice the normal value. The accuracy of blood pressure measurements using the laser Doppler flowmeter was comparable to that of the commonly used oscillometric sphygmomanometer, and the physiological circulation functional parameters were useful in identifying signs of edema and PAOD.
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Abstract: Background: Evidence supports a role for the gut-brain axis in Parkinson’s disease (PD). Mice overexpressing human wild type α– synuclein (Thy1-haSyn) exhibit slow colonic transit prior to motor deficits, mirroring prodromal constipation in PD. Identifying molecular changes in the gut could provide both biomarkers for early diagnosis and gut-targeted therapies to prevent progression. Objective: To identify early molecular changes in the gut-brain axis in Thy1-haSyn mice through gene expression profiling. Methods: Gene expression profiling was performed on gut (colon) and brain (striatal) tissue from Thy1-haSyn and wild-type (WT) mice aged 1 and 3 months using 3′ RNA sequencing. Analysis included…differential expression, gene set enrichment and weighted gene co-expression network analysis (WGCNA). Results: At one month, differential expression (Thy1-haSyn vs. WT) of mitochondrial genes and pathways related to PD was discordant between gut and brain, with negative enrichment in brain (enriched in WT) but positive enrichment in gut. Linear regression of WGCNA modules showed partial independence of gut and brain gene expression changes. Thy1-haSyn-associated WGCNA modules in the gut were enriched for PD risk genes and PD-relevant pathways including inflammation, autophagy, and oxidative stress. Changes in gene expression were modest at 3 months. Conclusions: Overexpression of haSyn acutely disrupts gene expression in the colon. While changes in colon gene expression are highly related to known PD-relevant mechanisms, they are distinct from brain changes, and in some cases, opposite in direction. These findings are in line with the emerging view of PD as a multi-system disease.
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