the purpose of this study was to profiled the body composition, anthropometric and physical fitness qualities of iranian national adolescent volleyball players, and quantified relationships between these characteristics. the sample of this study was 40 national adolescent volleyball players (age: 17.9±0.3). body composition factors: (weight, bmi, whr, body fat percentage, muscle mass) and anthr...

There is a substantial evidence that plyometric training significantly increases muscular strength and vertical jump. Due to the vigorous nature of this type of training, however, there is a risk of incurring musculoskeletal injuries. Therefore, conducting plyometric exercise programs in an aquatic environment might lead to significant improvements in vertical jump with possibly a lower risk of...

formation of hydraulic jump is necessary for dissipation of the excess kinetic energy downstream of spillways and gates. hydraulic jump stilling basins of sudden expansion are one of the energy dissipater structures which are used where the available tail water depth is less than the required sequent depths. in the present study to further reduce the hydraulic jump sequent depths ratio, a rough...

Jump Point Search, an algorithm developed for fast search on uniform cost grids, has successfully improved the performance of grid-based search. But, the approach itself is actually a set of diverse ideas applied together. This paper decomposes the algorithm and gradually re-constructs it, showing the component pieces from which the algorithm is constructed. In this process, we are able to defi...

A strategy commonly observed in Internet auctions is that of “jump bidding,” or entering a bid larger than what is necessary to be a currently winning bidder. In this paper, we argue that the cost associated with entering online bids and the uncertainty about future entry—both of which distinguish Internet from live auctions—can explain this behavior. We present a simple theoretical model that ...

Jump bidding is a commonly observed phenomenon that involves bidders in ascending auctions submitting bids higher than required by the auctioneer. Such behavior is typically explained as due to irrationality or to bidders signaling their value. We present field data that suggests such explanations are unsatisfactory and construct an alternative model in which jump bidding occurs due to strategi...

Dan Sargent was 46 years old when he died unexpectedly on September 22, 2016, during a brief hospitalization at theMayo Clinic. He grew up in Rochester, Minnesota, where his family runs a successful landscaping business, before completing his undergraduate and doctoral degrees at the nearby University of Minnesota. While an undergraduate there, he caught the attention of Don Berry, the Bayesian...

We analyze basic properties of about 200 metal systems observed in high resolution spectra of 9 quasars by Boksenberg, Sargent& Rauch (2003). The measured Doppler parameters for the hydrogen and carbon lines are found to be different by a factor

l1li' 11' In this note we derive optimal prediction formulas to be used in solving continuous time rational expectations models. In these derivations we employ Laplace transforms in a manner analogous to the use of z transforms for solving discrete time optimal prediction problems in Hansen and Sargent (1980a, Appendix A). The formulas are intended to play the same role for continuous time mode...