“Weep You No More, Sad Fountains” an Original Choral Work Displaying Certain Archaic Compositional Devices

A study of selected contemporary choral music revealed that modern composers, seeking new sounds, frequently use archaic compositional devices. The problem for the writer became the composition of an original choral work utilizing archaic devices

Space Station Freedom solar array containment box mechanisms

Space Station Freedom will feature six large solar arrays, called solar array wings, built by Lockheed Missiles & Space Company under contract to Rockwell International, Rocketdyne Division. Solar cells are mounted on flexible substrate panels which are hinged together to form a 'blanket.' Each wing is comprised of two blankets supported by a central mast, producing approximately 32 kW of power at beginning-of-life. During launch, the blankets are fan-folded and compressed to 1.5 percent of their deployed length into containment boxes. This paper describes the main containment box mechanisms designed to protect, deploy, and retract the solar array blankets: the latch, blanket restraint, tension, and guidewire mechanisms

The Physiological and Perceived Impact of Wearing a Face Mask During Maximal Exercise

The COVID-19 pandemic prompted the expectation of facemasks in fitness facilities during exercise. However, the physiological and perceptual responses of wearing a facemask during exercise has not been fully investigated. The purpose of this study was to determine the effect of facemasks on selected physiological and subjective variables during exercise.  Using a crossover design, males (n =8) and females (n=7) and were randomly assigned to (1) a surgical facemask, (2) a cloth face mask, and (3) no mask and completed Bruce Protocol maximal graded treadmill tests 48 hrs apart. Collected data included heart rate (HR), oxyhemoglobin saturation (SpO2), rating of perceived dyspnea (DYS), perceived rate of exertion (RPE) and time to exhaustion (TTE). No significant (p>0.05) differences were found for HR or SpO2 at any of the treadmill stages. DYS was higher with both masks compared to no mask, but only significant (p < 0.05) between the cloth and no mask conditions in stages 2 and 3. RPE was greater in both mask conditions compared to no masks, but only significantly greater between the cloth mask and no mask conditions in stage 3. No significant differences were found for TTE among the conditions. Wearing face masks during exercise and has little effect on HR, SpO2, or TTE. However, facemasks may negatively influence DYS and RPE contributing to feelings of exhaustion. Participants should be made aware that the discomfort of wearing a mask during exercise will not hamper performance

Business Model Innovation Portfolio Strategy for Growth Under Product-Market Configurations

Purpose: The research links three concepts: product market growth strategy, the magnitude of innovation and Business Model Innovation, merging them together into a dynamic Business Model Innovation strategy framework. Design/Methodology/Approach: The paper is conceptual and exploratory in nature and builds on existing literature and the author’s experience with developing business models. Findings: The BMI strategy framework can help managers establish a BMI portfolio strategy following six pathways within four categories. Conclusions lead to avenues for future research in Business Model Innovation portfolio strategy, dynamic Business Model Innovation processes, and market innovation. Originality/Value: The article deepens the theoretical understanding of Business Model Innovation strategy and provides an enriched dynamic classification of Business Model Development and Business Model Innovation, new to the rm, new to the market and new to the world and the expected outcome being more or less novel (incremental, evolutionary, transformative). Our analysis brings new insights into the recent development in the literature from a static to a more dynamic view on Business Model Innovation, supporting a dynamic analysis of strategy development and Business Model Innovation processes.

The Impact of Aquatic Based Plyometric Training on Jump Performance: A Critical Review

International Journal of Exercise Science 14(6): 815-828, 2021. There is evidence to suggest that aquatic plyometric training (APT) may be an effective and safer alternative to traditional land-based plyometric training (LPT) when training to increase jump performance. The aim of this review was to critically examine the current literature regarding the effects of APT vs. LPT on jump performance in athletic populations. Key terms were employed in five separate databases to complete the current review. Available articles were screened for inclusion and exclusion criteria to determine which studies were deemed eligible for review. Outcome measure in these studies included those assessing lower extremity power and jump performance (i.e., drop jumps, broad jumps, sergeant jumps, repeated countermovement jumps, and vertical jumps). All but one of the studies included in this critical review showed significant improvements in jump performance after LPT and APT interventions. Both LPT and APT groups experienced similar increases in jump performance and lower-body power, pre- to post-test, in the majority of the studies examined in this review. LPT and APT have the ability to improve lower extremity explosive strength and jump performance within athletic populations. Improvements in lower body power may improve overall athletic performance. Observations from this review may be used by sport coaches, strength coaches, and athletes alike to weigh the pros and cons of both forms of plyometric training. Observations from this review may also be used to weigh the pros and cons of APT over LPT in terms of reducing risk of injury

Comparison of Physiological Responses and Perceived Respiratory Resistance Among Mask Usage During Exercise

Since the beginning of the COVID-19 pandemic, the use of a face mask in public is recommended when social distancing cannot be maintained to decrease the spread of the virus with many fitness facilities requiring their patrons to wear a face mask during exercise. The physiological response of wearing a face mask during exercise is relatively unknown and is speculated among the media resulting in contradicting messages conveyed to the public PURPOSE: The purpose of this study was to determine if a face mask influenced performance (time to exhaustion), physiological responses (heart rate, oxyhemoglobin saturation and temperature) and subjective measurements such as dyspnea, perceived respiratory resistance, and rating of perceived exertion (RPE) during exercise. METHODS: Fifteen healthy males (n =8) and females (n=7) completed three graded exercise treadmill tests with (1) a surgical face mask, (2) a cloth face mask, and (3) no mask randomly with at least 48hrs apart. Heart rate (HR), oxyhemoglobin saturation (SpO2), temperature, RPE, dyspnea, was measured throughout exercise. Participants rated their perceived respiratory resistance for each condition at rest, beginning of exercise, and at fatigue using a 100 mm visual analog scale. RESULTS: Significant differences (p \u3c 0.05) were observed in perceived respiratory resistance between no mask and both surgical and cloth conditions at rest (1.55 ± 2.34mm; 6.33 ± 6.11mm; 9.67 ± 10.77mm respectively) and at the beginning of exercise (5.93 ± 6.64mm; 15.47 ± 12.56mm; 21.07± 15.04mm respectively). During stage 3 of the exercise test, the no mask condition had a significantly lower RPE compared to the cloth mask condition (13.22 ± 2.14;14.60 ± 2.13 respectively). Time to exhaustion was similar for all conditions (mask: 11:51 ± 2:31min; cloth: 11:16 ± 2:24min; surgical: 11:32 ± 2:23min). At all times points, there was no significant (p \u3e 0.05) difference between the conditions for HR, SpO2, temperature, and dyspnea. CONCLUSION: Wearing either a surgical or cloth face mask is safe during exercise in healthy adults and has no effect on HR, SpO2, or body temperature. It appears that wearing a face mask may have a minor influence on subjective measurements such as perceived respiratory resistance or RPE during exercise