Lateral speed control for vehicles with uncertain dynamics

This thesis presents the application of H∞, μ and linear parametric varying controller synthesis for collision avoidance system using uncertain vehicle and environmental dynamics. The system will adapt to the changing road scenarios that will allow the vehicle to avoid obstacles and prevent roll over circumvention by properly applying brakes or making a safe lane change. Robust performance is achieved by using the dynamical characteristics of the collision avoidance system for varying speeds which is governed by physical laws in term of mathematical modeling and significant uncertainties. The uncertain block diagram was analyzed for corresponding state space representation and was utilized to develop the linear fractional transformation framework of the robust controller synthesis with proper uncertainty and performance. The numerical simulation results demonstrate the viability of the controller in term of stability and performance for uncertain vehicle dynamics and changing environment

Is Coercion Involved in the Decision-Making of Medical Students Participating in Research?: A Cross-Sectional Study

10.1353/asb.2016.0002Asian Bioethics Review8120-3

Dental implant biomaterials

Implants have been gaining popularity amongst the patients and frequently are being considered as a first treatment option. Modern dentistry is beginning to understand, realize, and utilize the benefits of biotechnology in health care. Appropriate selection of the implant biomaterial is a key factor for long term success of implants. The biologic environment does not accept completely any material so to optimize biologic performance, implants should be selected to reduce the negative biologic response while maintaining adequate function. Every clinician should always gain a thorough knowledge about the different biomaterials used for the dental implants

Evaluation and comparison of mechanical properties of platelet-rich fibrin membrane, fish collagen membrane, bovine collagen membrane and chorionic membrane – An SEM study

Objectives: This study aimed to evaluate and compare the mechanical properties of platelet-rich fibrin (PRF) membrane with that of commercially available collagen membranes and chorionic membranes. Materials and Methods: The modulus of elasticity and hardness of PRF membrane, bovine collagen membrane, fish collagen membrane, and chorionic membrane were assessed using a universal testing machine. The in vitro degradation rate was assessed by placing these membranes on a temperature-controlled shaker set for one week. The degradation profiles were expressed as the accumulated weight loss of the membrane. A scanning electron microscope (SEM) evaluation of these membranes was done under both low and high magnification. One-way analysis of variance (ANOVA) and Tukey's post hoc tests were performed for statistical analysis. Results: A statistically significant difference in the tensile strength and hardness of membranes was observed. Bovine collagen membrane had the highest strength (84.11 MPa and 16.46 MPa) followed by fish collagen membrane, chorionic membrane, and least for PRF membranes observed. The degradation rate at one week was highest for the PRF membrane (55.6%), followed by the fish collagen membrane (32.5%). SEM evaluation showed that the bovine collagen membrane had significantly higher numbers of collagen fibres compared to the fish collagen membrane and chorionic membrane. Conclusion: Bovine collagen membrane had the highest mechanical properties with the maximum amount of collagen fibre meshwork. Only the PRF membrane had cellular distribution in its composition, while the commercially available membrane had significantly higher numbers of collagen fibres with the total absence of cellular components