On Tuesday, I went to the US Open, premier tennis tournament and, along with Wimbledon and Australian French Opens, one of four ‘Grand Slams’ world. I’m also a player (not very good one), so thought I’d devote this editorial how polymer chemistry has changed game tennis. Many thanks Wikipedia various websites for their help. If you look at late-1970s photos John McEnroe —the famous brat only sl...

We propose a new model for volatility forecasting which combines the Generalized Dynamic Factor Model (GDFM) and the GARCH model. The GDFM, applied to a large number of series, captures the multivariate information and disentangles the common and the idiosyncratic part of each series of returns. In this financial analysis, both these components are modeled as a GARCH. We compare GDFM+GARCH and ...

We investigated that the relationship between motor imagery ability and the effect of tactile input associated with holding a tennis racket on motor imagery of the forehand and backhand swings. The effect was assessed by the time utilized for motor imagery (mental chronometry). Seventeen tennis players imagined forehand and backhand swings with a forehand grip, a backhand grip or while holding ...

How do birds select the sounds they mimic, and in what contexts do they use vocal mimicry? Some birds show a preference for mimicking other species' alarm notes, especially in situations when they appear to be alarmed. Yet no study has demonstrated that birds change the call types they mimic with changing contexts. We found that greater racket-tailed drongos (Dicrurus paradiseus) in the rainfor...

Field tennis is a small ball game that requires field and the players need racket with its own string specifications. Like Wilson NXT brand strings on Hyper Hamer 7.5 racket, which has tension when it will receive ball. To find out of strings, necessary to do test. The bounce data was collected at positions 0 7 50 lbs analyzed by performing normality tests, homogeneity hypothesis testing. test ...

Field tennis is a small ball game that requires field and the players need racket with its own string specifications. Like Wilson NXT brand strings on Hyper Hamer 7.5 racket, which has tension when it will receive ball. To find out of strings, necessary to do test. The experiment was carried against Nassau bounce. This research quantitative descriptive in data are analyzed by performing normali...

Before the Industrial Revolution, artists and artisans would strive to make a work as perfect as possible. They used the technologies of their time to make as fine a product as their skill and limited technology allowed. Given the long painstaking efforts involved in creation, such items were few in number and available to only a minuscule number of elites. They were the crowning achievement of...

A torque-driven, subject-specific 3-D computer simulation model of the impact phase of one-handed tennis backhand strokes was evaluated by comparing performance and simulation results. Backhand strokes of an elite subject were recorded on an artificial tennis court. Over the 50-ms period after impact, good agreement was found with an overall RMS difference of 3.3° between matching simulation an...

Agility is the most important aspect in tennis court to support athlete’s performance, but there a study focusing on performance applying of agility especially for and comparing it with non-specific which equal. The aim this research evaluate factorial validity reliability three tests have been planned, conducted condition (with racket) (without racket). sample consists 28 players (15 males 13 ...