The subject of this thesis is the motion planning algorithm known as the continuation method. To solve motion planning problems, the continuation method proceeds by lifting curves in state space to curves in control space; the lifted curves are the solutions of special initial value problems called path-lifting equations. To validate this procedure, three distinct obstructions must be overcome. The first obstruction is that the endpoint maps of the control system under study must be twice continuously differentiable. By extending a result of A. Margheri, we show that this differentiability property is satisfied by an inclusive class of time-varying fully nonlinear control systems. The second obstruction is the existence of singular controls, which are simply the singular points of a fixed endpoint map. Rather than attempting to completely characterize such controls, we demonstrate how to isolate control systems for which no controls are singular. To this end, we build on the work of S. A. Vakhrameev to obtain a necessary and sufficient condition. In particular, this result accommodates time-varying fully nonlinear control systems. The final obstruction is that the solutions of path-lifting equations may not exist globally. To study this problem, we work under the standing assumption that the control system under study is control-affine. By extending a result of Y. Chitour, we show that the question of global existence can be resolved by examining Lie bracket configurations and momentum functions. Finally, we show that if the control system under study is completely unobstructed with respect to a fixed motion planning problem, then its corresponding endpoint map is a fiber bundle. In this sense, we obtain a necessary condition for unobstructed motion planning by the continuation method. / Thesis (Ph.D, Chemical Engineering) -- Queen's University, 2012-12-18 20:53:43.272

A good work environment is important for the individual, for industry and for society. The work environment research has, predominantly, targeted identification of problems and the measurement of the size of these problems. Innovations to reduce the incidence of musculoskeletal disorder, MSD, have been introduced in different branches of industry, but with limited success. Few of the ergonomic innovations developed for the building and construction industry have reached a sufficient level of adoption. Ergonomic innovations in the health care sector are of an incremental character and seem to have similar problems of adoption as the ones in the building and construction industry. Three examples of ergonomic innovation are examined in the thesis: a glue spreader for floor layers a four-wheel walker with a lifting device a sonographer’s scanning support device The studies show that an ergonomic innovation is not adopted for prevention of occupational injury unless the innovation also has other relative advantages apart from the ergonomic ones. For the group who already has sustained an injury, it is enough that the ergonomic problems are solved, while the other, symptom-free group, requires other advantages in order to adopt the innovation; increased production economy seems to be the most prominent potential advantage. / <p>QC 20150114</p>

Kinetic energy extraction devices for ocean and river flows are often located in the vicinity of the fluid free surface. This differs from wind turbines where the atmosphere may be considered to extend to infinity for the purposes of numerical modelling. As most kinetic energy extraction devices are based on lifting surfaces, a numerical model is sought which can model both lifting and free surface flows. One such model is the boundary element method which has been successfully applied to free surface problems and to lifting flows as well as the combined problem. This study seeks to develop a high order boundary element method that is capable of modelling unsteady lifting and free surface flows in three dimensions. Although high order formulations of boundary element methods are common for free surface problems, providing improved accuracy and computational time, their usage for lifting flows is less frequent. This may be due to the hypersingular boundary integral equation (HBIE) which must be solved in order to find the velocity of the vortex wakes behind lifting surfaces. In previous lifting flow studies using high order boundary element methods the wake velocities have been determined at the element centres and then interpolated to the collocation points. Not until the paper of Gray et al. (2004b) has a method been available for the direct solution of the HBIEs at the edges of three dimensional high order elements with C0 continuous interfaces. The solution employs a technique known as the Galerkin boundary element method. This study shows, for the first time, that the Galerkin boundary element method is applicable to the solution of the HBIE on the vortex wake of a lifting body. The application of the technique is then demonstrated as part of the numerical model developed herein. The model is based on the high order boundary element method developed by Xu (1992) for non-linear free surface flows. This formulation is extended to include steady uniform flow throughout the computational domain as well as the presence of lifting and non-lifting bodies. Several verification cases are implemented to test the accuracy of the model.

This study was to clarify strength factors using 12 selected exercises on the Universal Gym, and to determine what measures present a valid method of assessing strength of college-aged males, Eighty-eight males enrolled in beginning weight-training classes used the Universal Gym for twelve weeks, Subjects were tested for maximum strength on 12 exercises, Alpha and canonical factor analyses were performed on raw scores of all measures, and on scores when body weight and standing height variances were removed. A three-factor structure of upper extremity, lower extremity, and trunk strength was revealed when weight, and weight and height combined were statistically controlled. Results showed that residualized scores of weight can be used to evaluate strength on the Universal.Gym,

This study was to develop normative data of isotonic muscular strength in college females using the Spartacus model Universal Gym bench press and leg extension and to control for the influence of body weight. Two hundred and two college age females enrolled in weight training and conditioning classes used the Universal Gym for twelve weeks. Subjects were tested for maximum strength on 2 exercises and their percent body fat was calculated. Pearson-product moment correlations between lean body weight , body weight and the bench press test and the leg extension test were correlated. After statistically controlling for the effects of body weight, percentile ranks were calculated for both tests.

Title: Cheerleading - Methodical material of advanced stunts Objectives: The objective is to provide comprehensive outline of information about cheerleading and to create listing of recommendations for advanced stunts and practice of advanced stunts. Methods: Creation of chapter theoretical data was done by analyzing all available sources. The listing of recommendations for practicing advanced stunts was created by comparison of available literature concerning advanced stunts in cheerleading. Further we used the method of observation and then selected particular stunts for methodical material. Results: Comprehensive review of information about cheerleading. Complete listing of grips, load-ins and dismounts. Didactic recommendations for practice of advanced stunts formed into methodical lists and photo documentation. Keywords: Cheerleader, methodics, didactics, lifting figures

The purpose of this research was to investigate the effects of eccentric phase duration on concentric outcomes at 60% and 80% of one-repetition maximum (1RM) in the squat and bench press. Sixteen resistance-trained males completed four laboratory visits as follows: Day 1- 1RM testing; Day 2- establishment of normative eccentric durations; Days 3 and 4- randomized fast (0.75 times) or slow (2 times) eccentric duration variations, which were controlled by visual and auditory metronomes. Eccentric duration was significantly and inversely correlated with average concentric velocity (ACV) at 60% (r = 0.408) and 80% (r = -0.477) of 1RM squat and at 100% of 1RM bench press. At 60% of 1RM squat, both fast and slow eccentric conditions produced greater (p<0.001) peak concentric velocity (PCV) than normative duration with fast also producing greater PCV than slow (p=0.044). Therefore, fast eccentric durations may benefit concentric velocity. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2018. / FAU Electronic Theses and Dissertations Collection

by Wan Yu Kwan. / Thesis submitted in: December 1999. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 112-125). / Abstracts in English and Chinese. / Acknowledgement --- p.2 / Abstract --- p.3 / Table of Contents --- p.5 / Chapter Chapter 1 - --- Introduction --- p.7 / Chapter 1.1 --- Contribution of lifting techniques on risk assessment and training on manual materials handling --- p.7 / Chapter 1.2 --- Objectives --- p.12 / Chapter 1.3 --- Hypotheses --- p.12 / Chapter 1.4 --- Significance of Study --- p.13 / Chapter Chapter 2 - --- Literature Review --- p.14 / Chapter 2.1 --- Societal concerns on employee compensation --- p.14 / Chapter 2.2 --- Etiology of low back injury --- p.15 / Chapter 2.2.1 --- Compression forces on vertebral joints --- p.16 / Chapter 2.2.2 --- Shear forces on vertebral joints --- p.17 / Chapter 2.3 --- Lifting techniques --- p.18 / Chapter 2.3.1 --- Effect of lifting techniques on curvature of the spine --- p.22 / Chapter 2.3.2 --- Importance of leg muscles in manual lifting --- p.22 / Chapter 2.4 --- Prediction of low back injury in manual lifting --- p.24 / Chapter 2.4.1 --- Compression forces and moments --- p.26 / Chapter 2.4.2 --- Balance control --- p.29 / Chapter 2.4.3 --- Application of Surface electromyography in ergonomics --- p.31 / Chapter Chapter 3 - --- Method --- p.34 / Chapter 3.1 --- Subject recruitment --- p.34 / Chapter 3.2 --- Equipment --- p.35 / Chapter 3.2.1 --- Force platform --- p.35 / Chapter 3.2.2 --- Motion analysis system --- p.37 / Chapter 3.2.3 --- Surface electromyography --- p.38 / Chapter 3.3 --- Maximum voluntary contraction test --- p.40 / Chapter 3.3.1 --- MVC of vastus medialis --- p.41 / Chapter 3.3.2 --- MVC of medial gastrocnemius --- p.42 / Chapter 3.3.3 --- MVC of erector spinae --- p.43 / Chapter 3.4 --- Lifting techniques --- p.44 / Chapter 3.5 --- Experimental procedures --- p.48 / Chapter 3.6 --- Statistical analysis --- p.53 / Chapter Chapter 4 - --- Results and Dicussion --- p.54 / Chapter 4.1 --- No. of cases in the study --- p.54 / Chapter 4.2 --- Phases of lifting --- p.55 / Chapter 4.3 --- Process time --- p.56 / Chapter 4.4 --- Trunk inclination angles --- p.62 / Chapter 4.5 --- Hip joint angles --- p.67 / Chapter 4.6 --- Knee joint angles --- p.73 / Chapter 4.7 --- Center of mass of box --- p.79 / Chapter 4.8 --- Muscle activities --- p.84 / Chapter Chapter 5 - --- Conclusion --- p.109 / Chapter Chapter 6 - --- References --- p.112

Thesis. 1979. Ph.D.--Massachusetts Institute of Technology. Dept. of Ocean Engineering. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: leaves 154-158. / Ph.D.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: leaves 144-148. / by David Scott Greeley. / Ph.D.