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depth jump

Adel Albaba, Stéphane Lambert, Thierry Faug
The present paper investigates the mean impact force exerted by a granular mass flowing down an incline and impacting a rigid wall of semi-infinite height. First, this granular flow-wall interaction problem is modeled by numerical simulations based on the discrete element method (DEM). These DEM simulations allow computing the depth-averaged quantities-thickness, velocity, and density-of the incoming flow and the resulting mean force on the rigid wall. Second, that problem is described by a simple analytic solution based on a depth-averaged approach for a traveling compressible shock wave, whose volume is assumed to shrink into a singular surface, and which coexists with a dead zone...
May 2018: Physical Review. E
Lachlan J G Mitchell, Ben Rattray, Philo U Saunders, David B Pyne
OBJECTIVES: In elite age-group swimming it is unclear to what degree common assessments of anthropometric, jump performance and front-crawl critical speed (CS) correlate with competition performance. DESIGN: Cross-sectional field study. METHODS: Forty eight elite national-level junior swimmers (22 males, age 16.5±1.2 y, 26 females, age 15.5±1.1 y; mean±SD) completed anthropometry tests, loaded and unloaded countermovement jumps and a series of front-crawl time-trials to determine CS and supra-CS distance capacity (D')...
May 24, 2018: Journal of Science and Medicine in Sport
Pankaj Kr Mishra, Vincent Bettaque, Oriol Vendrell, Robin Santra, Ralph Welsch
Ultrashort, high-intensity THz pulses, e.g., created at free-electron laser facilities, allow for direct investigation as well as the driving of intermolecular modes in liquids like water and thus will deepen our understanding of the hydrogen bonding network. In this work, the temperature-jump (T-jump) of water induced by THz radiation is simulated for ten different THz frequencies in the range from 3 to 30 THz and five different pulse intensities in the range from 1 × 1011 to 5 × 1012 W/cm2 employing both ab initio molecular dynamics (AIMD) and force field molecular dynamics (FFMD) approaches...
May 18, 2018: Journal of Physical Chemistry. A
Ethan Stewart, Thomas Kernozek, Hsien-Te Peng, Brian Wallace
BACKGROUND: This study quantified the peak vertical ground reaction force (VGRF), impulse, and average and instantaneous loading rates developed during bilateral plyometric exercises. METHODS: Fourteen collegiate male athletes performed four different bilateral plyometric exercises within a single testing session. Depth jumps from thirty, sixty and ninety centimeter heights (DJ30, DJ60, and DJ90, respectively), and a two consecutive jump exercise (2CJ), were randomly performed...
April 20, 2018: Journal of Sports Medicine and Physical Fitness
Jan Gajewski, Radosław Michalski, Krzysztof Buśko, Joanna Mazur-Różycka, Zbigniew Staniak
PURPOSE: The aim of this study was to identify the determinants of peak power achieved during vertical jumps in order to clarify relationship between the height of jump and the ability to exert maximum power. METHODS: One hundred young (16.8±1.8 years) sportsmen participated in the study (body height 1.861 ± 0.109 m, body weight 80.3 ± 9.2 kg). Each participant performed three jump tests: countermovement jump (CMJ), akimbo countermovement jump (ACMJ), and spike jump (SPJ)...
2018: Acta of Bioengineering and Biomechanics
H Mitsudera, T Miyama, H Nishigaki, T Nakanowatari, H Nishikawa, T Nakamura, T Wagawa, R Furue, Y Fujii, S Ito
Sea surface temperature (SST) fronts in mid- to high-latitude oceans have significant impacts on extratropical atmospheric circulations and climate. In the western subarctic Pacific, sharp SST fronts form between the cold subarctic water and the recently found quasi-stationary jets that advect warm waters originating in the Kuroshio northeastward. Here we present a new mechanism of the jet formation paying attention to the propagation of baroclinic Rossby waves that is deflected by eddy-driven barotropic flows over bottom rises, although their height is low (~500 m) compared with the depth of the North Pacific Ocean (~6000 m)...
March 22, 2018: Nature Communications
Benjamin F Mentiplay, Ksaniel Hasanki, Luke G Perraton, Yong-Hao Pua, Paula C Charlton, Ross A Clark
The Microsoft Xbox One Kinect™ (Kinect V2) contains a depth camera that can be used to manually identify anatomical landmark positions in three-dimensions independent of the standard skeletal tracking, and therefore has potential for low-cost, time-efficient three-dimensional movement analysis (3DMA). This study examined inter-session reliability and concurrent validity of the Kinect V2 for the assessment of coronal and sagittal plane kinematics for the trunk, hip and knee during single leg squats (SLS) and drop vertical jumps (DVJ)...
March 1, 2018: Journal of Sports Sciences
P Grassia
The pressure-driven growth model for advance of a foam front through an oil reservoir during foam improved oil recovery is considered: specifically the limit of strong heterogeneity in the reservoir permeability is treated, such that permeability variation with depth more than outweighs the tendency of the net pressure driving the front to decay with depth. This means that the fastest moving part of the front is not at the top of the solution domain, but rather somewhere in the interior. Moreover the location of the foam front on the top boundary of the system can no longer be specified as a boundary condition, but instead must be determined as part of the solution of the problem...
January 25, 2018: European Physical Journal. E, Soft Matter
Tova Band-Winterstein, Ilanit Tuito
This research note addresses how ultra-Orthodox Jewish women in Israel coping with intimate partner violence experienced the spouse selection process. In-depth semistructured qualitative-phenomenological interviews were conducted with 17 women. Four major themes emerged: (a) "The matchmaker seemingly fell asleep on her watch"; (b) The parents' mistakes; (c) "The rabbi told me to jump into the water. Now he should hand me the paddles to get out!" The rabbi's role; and (d) "That's it ...
May 2018: Violence Against Women
Troels Mygind-Klausen, André Jæger, Camilla Hansen, Rasmus Aagaard, Lise Qvirin Krogh, Mette Amalie Nebsbjerg, Kristian Krogh, Bo Løfgren
INTRODUCTION: In-hospital cardiac arrest has a poor prognosis and often occurs in patients lying in a hospital bed. A bed mattress is a soft compressible surface that may decrease cardiopulmonary resuscitation (CPR) quality. Often hospital CPR training is performed with a manikin on the floor. AIM: To study CPR quality following realistic CPR training with a manikin in a bed compared with one on the floor. METHODS: We conducted a randomised controlled study...
December 13, 2017: American Journal of Emergency Medicine
Jie Deng, Kanani K M Lee
Convection provides the mechanism behind plate tectonics, which allows oceanic lithosphere to be subducted into the mantle as "slabs" and new rock to be generated by volcanism. Stagnation of subducting slabs and deflection of rising plumes in Earth's shallow lower mantle have been suggested to result from a viscosity increase at those depths. However, the mechanism for this increase remains elusive. Here, we examine the melting behavior in the MgO-FeO binary system at high pressures using the laser-heated diamond-anvil cell and show that the liquidus and solidus of (Mgx Fe1-x )O ferropericlase (x = ~0...
December 8, 2017: Nature Communications
Timothy C Mauntel, Darin A Padua, Laura E Stanley, Barnett S Frank, Lindsay J DiStefano, Karen Y Peck, Kenneth L Cameron, Stephen W Marshall
CONTEXT:   The Landing Error Scoring System (LESS) can be used to identify individuals with an elevated risk of lower extremity injury. The limitation of the LESS is that raters identify movement errors from video replay, which is time-consuming and, therefore, may limit its use by clinicians. A markerless motion-capture system may be capable of automating LESS scoring, thereby removing this obstacle. OBJECTIVE:   To determine the reliability of an automated markerless motion-capture system for scoring the LESS...
November 2017: Journal of Athletic Training
Kiyoumars Roushangar, Reyhaneh Valizadeh, Roghayeh Ghasempour
Sudden diverging channels are one of the energy dissipaters which can dissipate most of the kinetic energy of the flow through a hydraulic jump. An accurate prediction of hydraulic jump characteristics is an important step in designing hydraulic structures. This paper focuses on the capability of the support vector machine (SVM) as a meta-model approach for predicting hydraulic jump characteristics in different sudden diverging stilling basins (i.e. basins with and without appurtenances). In this regard, different models were developed and tested using 1,018 experimental data...
October 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Natércia Matias, Asbjèrn Haaning Nielsen, Jes Vollertsen, Filipa Ferreira, José Saldanha Matos
Over the last decades, considerable progress has been made in the understanding of the sulfur cycle in sewer systems. In spite of a wealth of experimental and field studies that have addressed the release of hydrogen sulfide from free surface flows in gravity sewers and the corresponding air-water mass transfer, little is known about hydrogen sulfide emission under highly turbulent conditions (e.g., drop structures, hydraulic jumps). In this study, experimental work was carried out to analyze the influence of characteristics of drops on reaeration...
September 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Andrew E Hudson
There is strong evidence that anesthetics have stereotypical effects on brain state, so that a given anesthetic appears to have a signature in the electroencephalogram (EEG), which may vary with dose. This can be usefully interpreted as the anesthetic determining an attractor in the phase space of the brain. How brain activity shifts between these attractors in time remains understudied, as most studies implicitly assume a one-to-one relationship between drug dose and attractor features by assuming stationarity over the analysis interval and analyzing data segments of several minutes in length...
2017: Frontiers in Neural Circuits
Donald B Jump, Kelli A Lytle, Christopher M Depner, Sasmita Tripathy
Obese and type 2 diabetic (T2DM) patients have a high prevalence of nonalcoholic fatty liver disease (NAFLD). NAFLD is a continuum of chronic liver diseases ranging from benign hepatosteatosis to nonalcoholic steatohepatitis (NASH), cirrhosis and primary hepatocellular cancer (HCC). Because of its strong association with the obesity epidemic, NAFLD is rapidly becoming a major public health concern worldwide. Surprisingly, there are no FDA approved NAFLD therapies; and current therapies focus on the co-morbidities associated with NAFLD, namely, obesity, hyperglycemia, dyslipidemia, and hypertension...
January 2018: Pharmacology & Therapeutics
Z L Zhou, X X Sun, J Ma, M H Tong, S K Y To, A S T Wong, A H W Ngan
Recent studies have indicated that the nanoindentation measured stiffness of carcinoma adherent cells is in general lower than normal cells, thus suggesting that cell stiffness may serve as a bio-marker for carcinoma. However, the proper establishment of such a conclusion would require biophysical understanding of the underlying mechanism of the cell stiffness. In this work, we compared the elastic moduli of the actin cytoskeletons of Hey A8 ovarian carcinoma cells with and without metastasis (HM and NM), as measured by 2D atomic force microscopy (AFM) with low-depth nanoindentation via a rate-jump method...
July 26, 2017: Journal of Biomechanics
Chun Li, Xun Zhang, Ying Chen, James Carr, Simon Jacques, Julia Behnsen, Marco di Michiel, Ping Xiao, Robert Cernik
We carried out a residual stress distribution analysis in a APS TBC throughout the depth of the coatings. The samples were heat treated at 1150 °C for 190 h and the data analysis used image based modelling based on the real 3D images measured by Computed Tomography (CT). The stress distribution in several 2D slices from the 3D model is included in this paper as well as the stress distribution along several paths shown on the slices. Our analysis can explain the occurrence of the "jump" features near the interface between the top coat and the bond coat...
August 2017: Data in Brief
Shannon Baker Powell, Martha Keehner Engelke, Janice A Neil
School nurses are well positioned to assess, intervene, and evaluate efforts to positively impact students who are overweight or obese. The purpose of this qualitative, descriptive study was to explore the experiences of school nurses providing care to children living with overweight and obesity. Data were collected through face-to-face, tape-recorded, in-depth, open-ended interviews with 10 school nurses from rural areas of North Carolina working with minority and low-income children in the public school setting...
January 1, 2017: Journal of School Nursing: the Official Publication of the National Association of School Nurses
Jacob E Earp, Robert U Newton, Prue Cormie, Anthony J Blazevich
Tendons possess both viscous (rate-dependent) and elastic (rate-independent) properties that determine tendon function. During high-speed movements external loading increases both the magnitude (FT) and rate (RFDT) of tendon loading. PURPOSE: The influence of external loading on muscle and tendon dynamics during maximal vertical jumping was explored. METHODS: Ten resistance-trained men performed parallel-depth, countermovement vertical jumps with and without additional load (0%, 30%, 60%, and 90% of maximum squat lift strength), while joint kinetics and kinematics, quadriceps tendon length (LT) and patellar tendon FT and RFDT were estimated using integrated ultrasound, motion analysis and force platform data and muscle tendon modelling...
November 2017: Medicine and Science in Sports and Exercise
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