scholarly journals SwimOne. New Device for Determining Instantaneous Power and Propulsive Forces in Swimming

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7169
Author(s):  
Francisco Hermosilla ◽  
Lis Corral-Gómez ◽  
José M. González-Ravé ◽  
Daniel Juárez Santos-García ◽  
David Rodríguez-Rosa ◽  
...  
Keyword(s):  
Differential Equation ◽  
Swimming Performance ◽  
Great Influence ◽  
Propulsive Force ◽  
New Device ◽  
Preliminary Results ◽  
Instantaneous Power ◽  
Instant Power ◽  
High Level ◽  
Actuation Systems

The propulsive forces and instantaneous power that are generated by a swimmer have a great influence on the swimming performance. This works presents a new device, called SwimOne, for measuring propulsive force and estimating the instantaneous power of the swimmer. In addition, the detailed prototype is able to exert a customizable opposition force to the swimmer for training purpose. The conceptual idea is presented by describing the differential equation of the swimmer and the protocol for a factible estimation of the instantaneous power. The variables that are to be measured and estimated are identified and, consequently, the sensor and actuator systems can be selected. The high-level and detailed designs of the prototype are presented together with the protocol that is carried out in order to validate the sensor and actuation systems. The device is able to monitor the variables of interest of the swimmer together with the propulsive force and instant power. Finally, some experiments are carried out providing the results of several participants swimming in crawl, backstroke, butterfly, and breaststroke styles in the presence of different opposition force. The preliminary results show that SwimOne is valid for measuring instantaneous force and power with different loads in swimming.

scholarly journals Integrated Magnetohydrodynamic Pump with Magnetic Composite Substrate and Laser-Induced Graphene Electrodes

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1113
Author(s):  
Mohammed Asadullah Khan ◽  
Jürgen Kosel
Keyword(s):  
Magnetic Flux ◽  
Flow Rate ◽  
Magnetic Composite ◽  
Propulsive Force ◽  
Closed Channel ◽  
Lab On Chip ◽  
Composite Substrate ◽  
On Chip ◽  
High Level ◽  
Moving Parts

An integrated polymer-based magnetohydrodynamic (MHD) pump that can actuate saline fluids in closed-channel devices is presented. MHD pumps are attractive for lab-on-chip applications, due to their ability to provide high propulsive force without any moving parts. Unlike other MHD devices, a high level of integration is demonstrated by incorporating both laser-induced graphene (LIG) electrodes as well as a NdFeB magnetic-flux source in the NdFeB-polydimethylsiloxane permanent magnetic composite substrate. The effects of transferring the LIG film from polyimide to the magnetic composite substrate were studied. Operation of the integrated magneto hydrodynamic pump without disruptive bubbles was achieved. In the studied case, the pump produces a flow rate of 28.1 µL/min. while consuming ~1 mW power.

scholarly journals Enhancing main fermentation velocities in beer by the use of a membrane bioreactor – approach and preliminary results (membrane bioreactor beer)

2018 ◽  
Vol 14 (s1) ◽  
pp. 121-131 ◽  
Author(s):  
Lisa Stumpf ◽  
Stefan Schildbach
Keyword(s):  
Membrane Bioreactor ◽  
Membrane Technology ◽  
Gas Jet ◽  
Fermentation Processes ◽  
Preliminary Results ◽  
Module Design ◽  
Continuous Basis ◽  
Membrane Flux ◽  
High Level ◽  
Over Time

The potential of the most recent membrane technology is still unaccounted for in many respects. Combining fermentation with up-to-date membrane technology building a membrane bioreactor allows the adjustment of the cell count on a high level, increasing yield per volume and time. Applied to beer manufacturing, main fermentation times of less than 20 h seem possible, avoiding the disadvantages of already known accelerated fermentation processes operated on a continuous basis. Although module design was adapted and backwash procedure altered to gas-jet, maintaining a sufficient membrane flux over time still poses a major problem. Nevertheless, preliminary results in respect of beer quality look promising.

Identifying Requirements for Healthcare Information Systems with Focus Groups

2013 ◽  
pp. 491-510 ◽  
Author(s):  
Carla Farinha ◽  
Miguel Mira da Silva
Keyword(s):  
Information System ◽  
Information Systems ◽  
Focus Groups ◽  
Healthcare Industry ◽  
Functional Requirements ◽  
Healthcare Information ◽  
Healthcare Information Systems ◽  
Preliminary Results ◽  
Hospital Managers ◽  
High Level

Healthcare Information Systems (HIS) are essential in the healthcare industry since they manipulate vital information. For example, HIS may keep track of the patient’s medical history, avoiding mistakes with medications, dosages, and treatments. However, the traditional methods for identifying HIS requirements focus on specifying functional requirements for the software. Moreover, system scope should be fully understood by stakeholders, such as healthcare workers and hospital managers, something extremely difficult to achieve in practice. As such, many requirements are incomplete, missing, or not needed, leading to expensive and inadequate HIS. The authors identify requirements for Healthcare Information System using Focus Groups. They evaluate this method with experiments, applying a variety of techniques and having encouraging preliminary results. In particular, they verify that stakeholders can reach consensus on high-level requirements by discussing different perspectives about the system scope. The authors conclude that Focus Groups are really effective.

COVID-19 and the Resilience of Tourism Businesses in Portugal

2021 ◽  
pp. 1-15
Author(s):  
Teresa Gomes da Costa ◽  
Maria de Lurdes Calisto ◽  
Jorge Umbelino
Keyword(s):  
Small Group ◽  
Mitigation Measures ◽  
Research Project ◽  
Preliminary Results ◽  
Wave Effects ◽  
High Level ◽  
The Impact

The pandemic of SARS-COV-2 has significantly affected tourism, and many tourism companies have seen their revenue significantly reduced. Thus, the question arises: 'How resilient are tourism companies to the COVID-19 pandemic (1st wave) effects on their activity?' This chapter presents the preliminary results of a broader research project: RE.COV.ER. Based on a sample of 1,075 tourism companies operating in Portugal, this study describes the impact of the pandemic's first wave on tourism companies and explores their resilience. Results reveal a high level of impact of the pandemic on tourism companies. In terms of resilience, most companies' managers are perceived as proactive, and many companies implemented mitigation measures. Even though half of the companies could not find effective responses to the situation, there is, however, one small group of companies that seem to be more resilient, suggesting the need for more investigation on the reasons why.

Migration and Hereditary Disease in the Saguenay Population of Eastern Quebéc

1987 ◽  
Vol 21 (3) ◽  
pp. 592-608 ◽  
Author(s):  
Margaret I. Gradie ◽  
Danielle Gauvreau
Keyword(s):  
Genetic Structure ◽  
Genetic Disease ◽  
Genetic Diseases ◽  
Large Population ◽  
Hereditary Disease ◽  
Genetic Homogeneity ◽  
Preliminary Results ◽  
Consanguineous Marriages ◽  
High Level ◽  
The Relationship

This article examines the relationship between migration and genetic disease in the situation of the Saguenay region of Quέbec. This large population shows an elevated incidence of several genetic diseases. The process of migration, which created the population, is thought to be a major factor in determining the genetic structure of the contemporary population. Preliminary results suggest that although consanguineous marriages are not and never were frequent in the population, socially, kinship was important in determining migration and persistence, leading to a high level of genetic homogeneity today.

scholarly journals Training Loads, Wellness And Performance Before and During Tapering for a Water-Polo Tournament

2019 ◽  
Vol 66 (1) ◽  
pp. 131-141
Author(s):  
Petros G. Botonis ◽  
Argyris G. Toubekis ◽  
Theodoros I. Platanou
Keyword(s):  
Muscle Soreness ◽  
Perceived Exertion ◽  
Swimming Performance ◽  
Training Load ◽  
Rating Of Perceived Exertion ◽  
Training Period ◽  
Training Strategy ◽  
Water Polo ◽  
And Performance ◽  
High Level

AbstractWe investigated the effectiveness of a short-duration training period including an overloaded (weeks 1 and 2) and a reduced training load period (weeks 3 and 4) on wellness, swimming performance and a perceived internal training load in eight high-level water-polo players preparing for play-offs. The internal training load was estimated daily using the rating of perceived exertion (RPE) and session duration (session-RPE). Perceived ratings of wellness (fatigue, muscle soreness, sleep quality, stress level and mood) were assessed daily. Swimming performance was evaluated through 400-m and 20-m tests performed before (baseline) and after the end of weeks 2 and 4. In weeks 3 and 4, the internal training load was reduced by 19.0 ± 3.8 and 36.0 ± 4.7%, respectively, compared to week 1 (p = 0.00). Wellness was improved in week 4 (20.4 ± 2.8 AU) compared to week 1 and week 2 by 16.0 ± 2.2 and 17.3 ± 2.9 AU, respectively (p =0.001). At the end of week 4, swimming performance at 400-m and 20-m tests (299.0 ± 10.2 and 10.2 ± 0.3 s) was improved compared to baseline values (301.4 ± 10.9 and 10.4 ± 0.4 s, p < 0.05) and the overloading training period (week 2; 302.9 ± 9.0 and 10.4 ± 0.4 s, p < 0.05). High correlations were observed between the percentage reduction of the internal training load from week 4 to week 1 (-25.3 ± 5.5%) and the respective changes in 20-m time (-2.1 ± 2.2%, r = 0.88, p < 0.01), fatigue perception (39.6 ± 27.1%), muscle soreness (32.5 ± 26.6%), stress levels (25.6 ± 15.1%) and the overall wellness scores (28.6 ± 21.9%, r = 0.74-0.79, p < 0.05). The reduction of the internal training load improved the overall perceived wellness and swimming performance of players. The aforementioned periodization approach may be an effective training strategy in the lead-up to play-off tournaments.

scholarly journals New Methods for the Assessment of Flow Regime Alteration under Climate Change and Human Disturbance

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2435
Author(s):  
Pengfei Shi ◽  
Jiahong Liu ◽  
Tao Yang ◽  
Chong-Yu Xu ◽  
Jie Feng ◽  
...  
Keyword(s):  
Climate Change ◽  
Flow Regime ◽  
Yellow River ◽  
Anthropogenic Activities ◽  
Great Influence ◽  
Time Warping ◽  
New Methods ◽  
Range Of Variability Approach ◽  
Dynamic Time ◽  
High Level

Climate change and anthropogenic activities do collectively lead to an alteration of the flow regime, posing a great influence upon the structure and persistence of native biotic communities within river ecosystems. The range of variability approach (RVA) method is commonly used to evaluate the flow regime alteration. However, it was reported to underestimate the degree of flow regime potentially. In this study, two new assessment methods/metrics for evaluating the process behaviors of the flow regime are developed based on Euclidean distance and dynamic time warping (DTW) distance. They are then integrated with the metric of RVA, generating two composite metrics that represent both frequency and process changes of the flow regime. The new methods/metrics were applied to identify the flow regime alteration in a typical basin in the middle reaches of the Yellow River, China. The results show that the composite metrics consistently reveal a high alteration degree of flow regime in the basin. The decreased biological integrity of fish demonstrates the reasonability of the high-level overall alteration to some degree. The updated methods enable more scientific evaluation for the complex hydrologic alteration under a changing environment.

Comparison of Instantaneous Power from Variable Shock Loads in Time Based on the Dissipation Model

2013 ◽  
Vol 405-408 ◽  
pp. 3178-3181
Author(s):  
Marlena Rajczyk
Keyword(s):  
Differential Equation ◽  
Order Differential Equation ◽  
Function Analysis ◽  
Vibration Energy ◽  
Impact Loads ◽  
Driving Function ◽  
Instantaneous Power ◽  
Energy Proportionality ◽  
Dissipation Model ◽  
The Masses

The results of the analysis of the vibration energy from impact loads varying in time using the dissipation model. On the basis of the solutions resulting from the model of the second order differential equation with variable driving function analysis was performed at the time of the FFT function of the displacement of dissipation points by the adopted and specified matrix values of the masses, elasticity and damping. Spectral analysis is based on the compounds resulting from the vibration energy proportionality, as a momentary power surge force, to the sum of the product of the squares of the displacement and squares of the vibration frequency.

New Development in Computer Aided Electroforming for Rapid Prototyping Applications

2008 ◽  
Author(s):  
Mario Monzo´n ◽  
Pedro M. Herna´ndez ◽  
Mari´a D. Marrero ◽  
Antonio N. Beni´tez ◽  
Fernando Ortega ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
High Speed ◽  
Rotational Moulding ◽  
New Device ◽  
New Development ◽  
Metallic Shell ◽  
Edm Electrodes ◽  
Parts Manufacturing ◽  
Metallic Parts ◽  
High Level

Electroforming enables metallic parts manufacturing with good mechanical properties and high level of accuracy and reproducibility. A thin metallic shell is deposited on a model and later released from it. There are several applications of electroforming combined with rapid prototyping: injection moulds, EDM electrodes, moulds for rotational moulding, complex metallic parts, etc. However the two main disadvantages of electroforming are the non uniform thicknesses distribution and high time of shell manufacturing. The paper focuses on a new development in order to achieve uniform thickness and otherwise a faster shell manufacturing. A new device and software have been developed, named Elecform3D™. The device is an automatic machine controlled by computer and assembled into the electroforming equipment. Otherwise the software not only controls the device but also simulates and calculates the optimal positions of the cathode based in the electrolytic parameters of the bath. The software recommends an automatic program of movements or allows the operator to decide another alternatives programs if necessary. Elecform 3D is an important step beyond electroforming so far. RP 3D printer combined with Elecform 3D is a cheaper alternative for high quality metallic parts manufacturing in comparison with SLS-SLM technologies or high speed machining, mainly for rapid tooling and even rapid manufacturing.

P964 MICROWAVE ABLATION OF LIVER METASTASES FROM COLORECTAL CANCER USING A NEW DEVICE: PRELIMINARY RESULTS

2014 ◽  
Vol 60 (1) ◽  
pp. S396
Author(s):  
G. Poggi ◽  
L. Solbiati ◽  
F. Meloni ◽  
B. Montagna ◽  
M. Bezzi ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Liver Metastases ◽  
Microwave Ablation ◽  
New Device ◽  
Preliminary Results
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