Introduction by Thomas M. Alexander

Alexander, Thomas M.

doi:10.12987/9780300173468-001

Cited by 8 publications

(11 citation statements)

References 0 publications

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“…Taken together, the above-reported results were in line with previous literature dealing with the serving motion in Standing Volleyball 3 4 6 7 8 9 42 . Our results have two main practical implications from both coaching and training perspectives.…”

Section: Discussionsupporting

confidence: 92%

“…The advantages of higher Height IMPACT on V BALL have to do with the physics of a projectile in motion. In fact, the achievement of a high point of ball release allows the player to decrease the angle of ball release that is required to propel the ball over the net and into the opponent’s side of the court, thereby allowing for an impact with greater horizontal velocity 4 42 .…”

Section: Discussionmentioning

confidence: 99%

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Predictors of Ball Velocity in the Sitting Volleyball Serve: A Causal Analysis

et al. 2023

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This study explored the performance of the Sitting Volleyball serve by investigating the causal factors associated with ball velocity. Thirty-seven athletes underwent anthropometry and strength assessment and performed ten successful maximal effort serves. Ball velocity was measured using a sports radar gun. The hip, shoulder, elbow and wrist angles at the instant of ball impact as well as the height of ball impact were estimated through two-dimensional motion analysis. The causal relationships between variables were described through a linear Structural Equation Model and a Directed Acyclic Graph. Results showed that a smaller hip angle determines a greater shoulder angle, which in turn causes a greater elbow angle. A more open elbow angle together with a greater vertical reach allowed for a greater height of ball impact. Finally, increased height of ball impact along with greater abdominal strength are beneficial for higher ball velocity. These results underlined that the Sitting Volleyball serve is a multifactorial stroke involving anthropometric, technical and strength factors and suggest that athletes should improve their abdominal strength and master the technique necessary to perform the serve with the shoulder and the elbow joints fully extended in order to produce the greatest possible impact on the ball.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Predictors of Ball Velocity in the Sitting Volleyball Serve: A Causal Analysis

et al. 2023

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“…The last decades have seen significant advances in these three fundamental areas. [3][4][5][6][7] However, studies concerning steel corrosion in reinforced concrete structures, either in laboratory specimens or real structures, or representative pore solutions, have been focussed mainly on materials based on ordinary Portland cement (OPC) or OPC blended with supplementary cementitious materials (SCMs) such as blast furnace slag, fly ashes or calcined clays, simply because most of the concrete structures in the world have been made from these materials. Consequently, standards and recommendations on methods used to detect or qualify/quantify steel corrosion within a structure, generally apply only to conventional OPC-based materials.…”

Section: Introductionmentioning

confidence: 99%

Application of electrochemical methods for studying steel corrosion in alkali‐activated materials

Mundra

Samson

Masi

et al. 2023

Materials & Corrosion

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Alkali-activated materials (AAMs) are binders that can complement and partially substitute the current use of conventional cement. However, the present knowledge about how AAMs protect steel reinforcement in concrete elements is incomplete, and uncertainties exist regarding the application of electrochemical methods to investigate this issue. The present review by EFC WP11-Task Force 'Corrosion of steel in alkali-activated materials' demonstrates that important differences exist between AAMs and Portland cement, and between different classes of AAMs, which are mainly caused by differing pore solution compositions, and which affect the outcomes of electrochemical measurements. The high sulfide concentrations in blast furnace slag-based AAMs lead to distinct anodic polarisation curves, unusually low open circuit potentials, and low polarisation resistances, which might be incorrectly interpreted as indicating active corrosion of steel reinforcement. No systematic

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“…For all experiments, the first sample loading showed significant performance variability. This is likely due to the acclimation period of the microorganisms or growth medium leaching from the mats to the test medium. Our approach was to treat the first cycle as a wash and adaption step and exclude it from further rate evaluation.…”

Section: Discussionmentioning

confidence: 99%

Microbial Mats as a Biological Treatment Approach for Saline Wastewaters: The Case of Produced Water from Hydraulic Fracturing

Akyon

Stachler

Wei

et al. 2015

Environ. Sci. Technol.

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Treatment of produced water, i.e. wastewater from hydraulic fracturing, for reuse or final disposal is challenged by both high salinity and the presence of organic compounds. Organic compounds in produced water may foul physical-chemical treatment processes or support microbial corrosion, fouling, and sulfide release. Biological approaches have potential applications in produced water treatment, including reducing fouling of physical-chemical treatment processes and decreasing biological activity during produced water holding; however, conventional activated sludge treatments are intolerant of high salinity. In this study, a biofilm treatment approach using constructed microbial mats was evaluated for biodegradation performance, microbial community structure, and metabolic potential in both simulated and real produced water. Results demonstrated that engineered microbial mats are active at total dissolved solids (TDS) concentrations up to at least 100,000 mg/L, and experiments in real produced water showed a biodegradation capacity of 1.45 mg COD/gramwet-day at a TDS concentration of 91,351 mg/L. Additionally, microbial community and metagenomic analyses revealed an adaptive microbial community that shifted based upon the sample being treated and has the metabolic potential to degrade a wide array of contaminants, suggesting the potential of this approach to treat produced waters with varying composition.

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Introduction by Thomas M. Alexander

Cited by 8 publications

References 0 publications

Predictors of Ball Velocity in the Sitting Volleyball Serve: A Causal Analysis

Predictors of Ball Velocity in the Sitting Volleyball Serve: A Causal Analysis

Application of electrochemical methods for studying steel corrosion in alkali‐activated materials

Microbial Mats as a Biological Treatment Approach for Saline Wastewaters: The Case of Produced Water from Hydraulic Fracturing

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