THE STUDY OF OUTSTANDING HURDLING SPORTSMEN'S ISOKINETIC JOINT ANGLE

The isokintetic strength test systematic has a lot of functions. This text only tests the joint angles of 15 elites of our country, tight and accurate in the course of testing. After the repeated correction instrument, the athlete does a good job of the abundant warming-up exercise in order to test out the most accurate result, offer the accurate material to coach and scientific research personnel, grasp the joint angle that a qualified player gave play to the biggest muscular strength, find the best training scheme or regularity, raise the sport achievement

Asymptotic Estimates for Rational Spaces on Hypersurfaces in Function Fields

The ring of polynomials over a finite field has many arithmetic properties similar to those of the ring of rational integers. In this thesis, we apply the Hardy-Littlewood circle method to investigate the density of rational points on certain algebraic varieties in function fields. The aim is to establish asymptotic relations that are relatively robust to changes in the characteristic of the base finite field. More notably, in the case when the characteristic is "small", the results are sharper than their integer analogues

Effectiveness of Surface Treatment Techniques for Composite Bonding with Different Contamination Levels

Various surface treatment techniques have been developed to promote adhesive bond performance for composite structural components in aerospace applications. The condition of the pre-bond surface is critical to achieving desirable bond quality. Contamination on bonding surfaces is well recognized as a major threat to ultimate bond performance. Variation in contamination level has brought additional challenges into manufacturing process control. High fidelity surface treatment techniques are required for effective removal of contaminants over a wide range of contamination levels. In this study, a common contaminant, i.e. silicone mold release, was introduced to pre-bond composite surfaces with different concentrations. Plasma and laser surface treatment techniques were performed and their effectiveness in restoring and enhancing desirable bond quality was investigated. Surface characterization techniques, including water contact angle goniometry, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, were conducted to assess the condition of contaminated surfaces and the improvement induced by plasma and laser surface treatments. Failure modes from a customized double cantilever beam test were investigated before and after surface treatments. Fundamental mechanisms of plasma and laser surface treatments on the composite bonding surfaces were also investigated

Pitching Private Medicare Plans: An Analysis of Medicare Advantage and Prescription Drug Plan Advertising

Analyzes television, print, and radio ads for private Medicare plans to assess what types of information insurers emphasize and de-emphasize, what populations they target, and which type of plan they promote in trying to influence beneficiaries' choices

A Generalization of Roth's Theorem in Function Fields

Copyright © 2012 The University of MichiganFor n ∈ N = {1, 2, ...}, let D3([1, n]) denote the maximal cardinality of an integer subset of [1, n] containing no nontrivial 3-term arithmetic progression. In a fundamental paper [9], Roth proved that D3([1, n]) n/log log n. His result was later improved by Heath-Brown [4] and Szemerédi [11] to D3([1, n]) n/(log n)α for some small positive constant α > 0 (α = 1/20 in [11]). By introducing the notion of Bohr sets, Bourgain [2; 3] further improved this bound and showed that D3([1, n]) n(log log n)2 /(log n)2/3Research partially supported by an NSERC Discovery Grant

Generation of Ultra-intense Gamma-ray Train by QED Harmonics

When laser intensity exceeds 10^22W/cm^2, photons with energy above MeV can be generated from high-order harmonics process in the laser-plasma interaction. We find that under such laser intensity, QED effect plays a dominating role in the radiation pattern. Contrast to the gas and relativistic HHG processes, both the occurrence and energy of gamma-ray emission produced by QED harmonics are random and QED harmonics are usually not coherent, while the property of high intensity and ultra-short duration is conserved. Our simulation shows that the period of gamma-ray train is half of the laser period and the peak intensity is 1.4e22W/cm^2. This new harmonic production with QED effects are crucial to light-matter interaction in strong field and can be verified in experiments by 10PW laser facilities in the near future.Comment: 12 pages, 4 figure

Multidimensional Vinogradov-type Estimates in Function Fields

This article has been published in a revised form in the Canadian Journal of Mathematics https://doi.org/10.4153/CJM-2013-014-9. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. Copyright © Canadian Mathematical Society 2014.Let Fq[t] denote the polynomial ring over the finite field Fq. We employ Wooley’s new efficient congruencing method to prove certain multidimensional Vinogradov-type estimates in Fq[t]. These results allow us to apply a variant of the circle method to obtain asymptotic formulas for a system connected to the problem about linear spaces lying on hypersurfaces defined over Fq[t].Research supported by NSERC Discovery Grants || NSFC, 11126191 || NSFC, 11201163