scholarly journals Determining the Relationship Between the Velocity and Drag Coefficient of a Model Rocket

2021 ◽  
Vol 10 (3) ◽  
Author(s):  
Jason Qin ◽  
Christopher Smead
Keyword(s):  
Drag Coefficient ◽  
Negative Correlation ◽  
Air Drag ◽  
Full Size ◽  
Public Resources ◽  
The Relationship

There has been a significant uptick in interest among the wider public toward space and its associated technologies. Despite this, there is still a significant lack of public resources discussing the more nuanced areas of rocketry. One such area is the behavior of air around a rocket as its speed increases. The changing speed causes the air around the rocket to flow differently, resulting in different drag characteristics. This paper studies this relationship. In keeping with the focus on accessibility, this paper will use a model rocket instead of the full-size version. This paper finds that there is a negative correlation between speed and air drag on a rocket.

387 The moderating effect of emotion regulation strategies in the relationship between insomnia severity and bedtime procrastination

SLEEP ◽  
2021 ◽  
Vol 44 (Supplement_2) ◽  
pp. A153-A154
Author(s):  
Huisu Jeon ◽  
Sonhye Jeoung ◽  
Goeun Kim ◽  
Hyeyoung An ◽  
Hyojin Nam ◽  
...  
Keyword(s):  
Negative Correlation ◽  
Emotional Regulation ◽  
Significant Negative Correlation ◽  
Moderating Effect ◽  
Active Regulation ◽  
Support Seeking ◽  
Regulation Strategies ◽  
Bedtime Procrastination ◽  
The Relationship ◽  
Insomnia Severity

Abstract Introduction Bedtime Procrastination (BP) is defined as the behavior of going to bed later than intended, despite the absence of external factors. Bedtime procrastination is also prevalent among insomnia patients, and is associated with various sleep problems. Recent studies suggest emotional regulation as a mechanism of the procrastination behavior that is the conceptual foundation of bedtime procrastination. Emotional regulation difficulties are also associated with insomnia, but there is still a lack of research on the relationship between insomnia, emotional regulation strategies and bedtime procrastination. Thus, the study assumed that severity of insomnia would affect bedtime procrastination, and examined the moderating effect of the emotional regulation strategies in this relationship. Methods This study was conducted in 376 adults (mean age 23.73 ±2.14 years, 84.6% females). Participants were asked to answer Bedtime procrastination scale (BPS), an emotional regulation strategy checklist, and the Insomnia severity scale (ISI). Results As a result, a significant positive correlation was found between insomnia severity and bedtime procrastination (r=.286, p<.01), and avoidant/distractive regulation style (r=.101, p<.05). active regulation style (r=-.172, p<.01) and support seeking regulation style (r=-.102, p<.01) showed a significant negative correlation with the severity of insomnia. Bedtime procrastination behavior showed significant negative correlation only with active regulation style (r=-.151, p<.01). Support seeking regulation style moderated the relationship between insomnia and bedtime procrastination behavior (B=.0165, 95%, CI=.0014, .0316). The interaction effect between insomnia and support seeking regulation style was also significant (∆R^2=.0112, p<.05), indicating that the effect of insomnia on bedtime procrastination depends on the level of use of the support seeking regulation style. Conclusion These findings suggest that the level of support seeking regulation style is meaningful in terms of how insomnia affects bedtime procrastination. Support (if any) This work was supported by the Ministry of Education of the Republic of Korea and the National Research Foundation of Korea(NRF-2018S1A5A8026807)

scholarly journals Blood pressure level and laboratory indicators of disease severity in patients with arterial hypertension and COVID-19

2021 ◽  
Vol 28 (Supplement_1) ◽  
Author(s):  
K Popov ◽  
A Novitskiy ◽  
Y Shvarts
Keyword(s):  
Blood Pressure ◽  
Multivariate Analysis ◽  
Arterial Hypertension ◽  
Negative Correlation ◽  
Diastolic Pressure ◽  
Negative Relationship ◽  
Laboratory Parameters ◽  
Acute Period ◽  
Nonparametric Correlation ◽  
The Relationship

Abstract Funding Acknowledgements Type of funding sources: None. Background. Many patients with COVID-19 suffer from arterial hypertension and have marked variations in blood pressure (BP) during the acute period of infection. The reasons for such changes are poorly understood. Purpose. To assess the relationship between the level of BP and the severity of changes in the main clinical and laboratory parameters in patients with arterial hypertension and with a moderate course of COVID-19 at the stage of the height of the disease. Materials and methods. The study included 86 hospitalized patients with verified coronavirus disease of moderate severity: 46 of them were male, the median age was 65 years. Patients received adequate hypertension therapy for a long time. After hospitalization, treatment was adjusted if necessary. The level of laboratory parameters in the acute period of the disease was determined, including the electrolytes, C-reactive protein (CRP), albumin, ferritin, general blood test, etc. BP measured daily. The relationship between laboratory parameters and BP level was evaluated by nonparametric correlation using the Spearman coefficient and multivariate analysis based on the "generalized nonlinear model". Results. In 67.44% of patients with hypertension, an elevated BP level (>140/90) was observed against the background of moderate COVID-19. There was a significant negative correlation between the levels of CRP and BP throughout the stay in the hospital, the most significant is the 5th day of hospitalization. At the same time, a slightly stronger relationship is observed with diastolic BP (r = -0.4425) than with systolic BP (r = -0.3525). A similar trend is observed in all BP measurements. Besides, a negative correlation was found between potassium levels and BP values. The strongest association of potassium levels is with systolic BP on the day of hospitalization (r = -0.4850) and diastolic pressure on the 1st day of hospitalization (r = -0.3561). Multivariate analysis confirmed independent and reliable "influence" of CRP (p = 0.00018) and potassium (p = 0.03921) as independent predictors of diastolic pressure. Conclusions. Most patients with hypertension and moderate COVID-19 have elevated BP levels. There is a statistically significant negative relationship between the values of BP and levels of CRP and potassium. The obtained data may correspond to the existing hypothesis about the significant role of the kinin–kallikrein system in the pathogenesis of COVID-19.

scholarly journals Spatial Variation of the Relationship between PM2.5Concentrations and Meteorological Parameters in China

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Gang Lin ◽  
Jingying Fu ◽  
Dong Jiang ◽  
Jianhua Wang ◽  
Qiao Wang ◽  
...  
Keyword(s):  
Negative Correlation ◽  
Meteorological Parameters ◽  
Semiarid Region ◽  
Strong Positive Correlation ◽  
Annual Average ◽  
Strong Negative Correlation ◽  
Positive Correlation ◽  
Humid Region ◽  
The Relationship ◽  
Warm Temperate

Epidemiological studies around the world have reported that fine particulate matter (PM2.5) is closely associated with human health. The distribution of PM2.5concentrations is influenced by multiple geographic and socioeconomic factors. Using a remote-sensing-derived PM2.5dataset, this paper explores the relationship between PM2.5concentrations and meteorological parameters and their spatial variance in China for the period 2001–2010. The spatial variations of the relationships between the annual average PM2.5, the annual average precipitation (AAP), and the annual average temperature (AAT) were evaluated using the Geographically Weighted Regression (GWR) model. The results indicated that PM2.5had a strong and stable correlation with meteorological parameters. In particular, PM2.5had a negative correlation with precipitation and a positive correlation with temperature. In addition, the relationship between the variables changed over space, and the strong negative correlation between PM2.5and the AAP mainly appeared in the warm temperate semihumid region and northern subtropical humid region in 2001 and 2010, with some localized differences. The strong positive correlation between the PM2.5and the AAT mainly occurred in the mid-temperate semiarid region, the humid, semihumid, and semiarid warm temperate regions, and the northern subtropical humid region in 2001 and 2010.

Emotional labor strategies mediate the relationship between psychological empowerment and burnout of frontline hotel employees

2021 ◽  
Vol 49 (4) ◽  
pp. 1-10
Author(s):  
Min Li ◽  
Ziyu Zhao ◽  
Lijuan Cui
Keyword(s):  
Negative Correlation ◽  
Emotional Labor ◽  
Psychological Empowerment ◽  
Job Demands ◽  
Significant Negative Correlation ◽  
Job Burnout ◽  
Automatic Regulation ◽  
Conservation Of Resources ◽  
Hotel Employees ◽  
The Relationship

We examined the relationships among psychological empowerment, emotional labor strategies, and job burnout of frontline hotel employees with reference to conservation of resources theory and the job demands–resources model. A sample of 414 employees from a Chinese chain hotel was recruited to take part in this study. There was a significant negative correlation between psychological empowerment and job burnout for these frontline hotel employees. Furthermore, the emotional labor strategies of deep acting and automatic regulation played partial mediating roles in the relationship between psychological empowerment and job burnout, which has implications for the development of intervention mechanisms and work practices for addressing burnout.

Institutional Favoritism, Income, and Political Trust: Evidence from Jordan

2021 ◽  
Author(s):  
Ammar Shamaileh ◽  
Yousra Chaábane
Keyword(s):  
Negative Correlation ◽  
Political Institutions ◽  
Political Trust ◽  
Well Being ◽  
National Origin ◽  
The Political ◽  
Regression Analyses ◽  
Empirical Examination ◽  
The Relationship ◽  
Economic Well Being

What is the relationship between institutional favoritism, economic well-being, and political trust? Due to the role that East Bank tribes played in supporting the monarchy during the state’s formative years, Jordan has institutionalized a type of political discrimination that privileges East Bank Jordanians over Palestinian Jordanians. An empirical examination of the political institutions of the state reveals that such discrimination remains pervasive. It was subsequently theorized that institutional favoritism’s impact on political trust is conditional on income due to the greater salience of group identity among individuals with lower incomes. Regression analyses of survey data reveal a consistent negative correlation between political trust and income among East Bank Jordanians. There is little evidence of a substantively meaningful unconditional relationship between national origin and political trust.

Determination of the correlation relationship between irrigation and distribution of agricultural lands

2021 ◽  
Vol 07 (02) ◽  
pp. 29-35
Author(s):  
Kamil Zakir oğlu İbrahimli ◽  
Keyword(s):  
Key Words ◽  
Statistical Method ◽  
Negative Correlation ◽  
Agricultural Lands ◽  
Correlation Relationship ◽  
Positive Correlation ◽  
Correlation Methods ◽  
Correlation Degree ◽  
The Relationship

The importance of the statistical method is great in the study of natural and economic processes. It is possible to conduct analyzes and obtain results with the help of this method. Sometimes phenomena and processes co-exist and develop interdependently. In this case, it is necessary to determine the relationship between them, to express this relationship. Key words: perfect positive correlation, perfect negative correlation, direction of correlation, degree of correlation, methods of calculating correlation, Spearman᾽s method

Sport News on Facebook: The Relationship Between Interactivity and Readers’ Browsing Behavior

2014 ◽  
Vol 7 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Jan Boehmer ◽  
Stephen Lacy
Keyword(s):  
Public Relations ◽  
Negative Correlation ◽  
Web Site ◽  
Regression Analyses ◽  
Sport Communication ◽  
Work Routines ◽  
Sports News ◽  
Browsing Behavior ◽  
Number Of Individuals ◽  
The Relationship

This study analyzes how interactivity on Facebook relates to users’ browsing behaviors such as clicking a link, visiting a Web site, clicking articles on a Web site, and spending time on a sports news Web site. Regression analyses of 502 Facebook posts and the corresponding news articles show that the number of individuals who clicked on a link is not related to higher levels of interactivity, but an increase in interactivity did affect the number of overall visits generated. In addition, higher levels of interactivity had a slight negative correlation with the number of pages visited and the time spent on an organization’s Web site. Implications for the training and work routines of sport communication professionals in organizations, journalism, and public relations are discussed.

scholarly journals Assessment of the relationship between labial gingival thickness and the underlying bone thickness in maxillary anterior teeth by two digital techniques

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Linhong Wang ◽  
Yan Ruan ◽  
Jianping Chen ◽  
Yunxiao Luo ◽  
Fan Yang
Keyword(s):  
Negative Correlation ◽  
Significant Negative Correlation ◽  
Bone Thickness ◽  
Gingival Thickness ◽  
Anterior Teeth ◽  
Weak Negative Correlation ◽  
Implant Restoration ◽  
The Relationship ◽  
Esthetic Area ◽  
Healthy Participants

AbstractThis study aimed to noninvasively assess the relationship between the labial gingival thickness (GT) and the underlying bone thickness (BT) of maxillary anterior teeth by two digital techniques. A total of 30 periodontally healthy participants with 172 maxillary anterior teeth were enrolled. GT and BT were measured at 2, 4 and 6 mm apical to the cemento-enamel junction (CEJ) by two digital techniques: M1—cone-beam computed tomography (CBCT) and M2—digital intraoral scanning (DIS) combined with CBCT. The Pearson's correlation coefficient was calculated to determine the correlation between GT and BT. A significant negative correlation was identified between GT and BT at 2 mm apical to the CEJ for central incisors (CI), lateral incisors (LI), and canines (CA) both by M1 and M2, while a weak negative correlation at 4 mm apical to the CEJ was observed by M1 for CA. No significant correlation was found at other sites by both M1 and M2. The labial BT was < 1 mm in most cases (85% of CI; 97% of LI; and 90% of CA). Within the limitation of this study, it was concluded that GT and BT seemed to be negatively correlated at 2 mm apical to the CEJ. Therefore, caution is warranted when implant restoration at the esthetic area of the anterior teeth.

scholarly journals Social Anxiety in Relation to Self-Esteem among University Students in Jordan

2020 ◽  
Vol 13 (2) ◽  
pp. 96
Author(s):  
Odeh Suleiman Murad
Keyword(s):  
Social Anxiety ◽  
University Students ◽  
Negative Correlation ◽  
Significant Negative Correlation ◽  
Self Esteem ◽  
Personal Traits ◽  
Study Results ◽  
High Level ◽  
The Relationship ◽  
Academic Year

People with social anxiety demonstrate different behavioral aspects such as nervousness, apprehension, fear, and concern that negatively affect their personal traits and self-esteem. The current study is designed to identify the relationship between social anxiety and self-esteem among university students. To achieve this purpose, the descriptive correlation approach was utilized. Social anxiety and self-esteem scales were applied to a sample of 334 university students in Jordan. The study results revealed a low level of social anxiety and a high level of self-esteem among participants. In addition, there was a statistically significant negative correlation between the level of social anxiety and self-esteem among participants. The study recommended holding workshops and seminars for fresh students at the beginning of each academic year, to alleviate their feeling of stress and social anxiety and to raise the level of their self-esteem.

scholarly journals An Investigation into Change in Agricultural and Industrial Products Output-price Relationships Drawing from Nepalese Experience

2020 ◽  
pp. 12-19
Author(s):  
Ghan Shyam Dhakal
Keyword(s):  
Standard Deviation ◽  
Negative Correlation ◽  
Agricultural Sector ◽  
Agricultural Products ◽  
Fiscal Year ◽  
Annual Growth Rate ◽  
Industrial Products ◽  
Industrial Sectors ◽  
Low Degree ◽  
The Relationship

Purpose: This research article explored the relationship between change in output and domestic price of both agricultural and industrial products and the variability or consistency of the annual growth rate of change in price and output of both agricultural and industrial sectors of Nepal. Objectives: The research aimed to establish the relationship between change in the price of agricultural products and change in the price of industrial products in Nepal. Methods: The study applied descriptive and analytical approaches to measure the relationship or correlation between changes in output and prices of products in the agricultural and industrial sectors. The parameters were analysed by comparing the standard deviation and coefficient of variation. The relation of agricultural and industrial product output with price is established by using a simple correlation analysis. Limitations: Based on secondary data collected from various economic surveys of Nepal covering 17 years from fiscal year 2002/03 to 2018/19. It measured the relationship between the annual change in price and output of agricultural and industrial production using simple statistical tools like mean, standard deviation, and correlation. Results: It was found that there is a moderate positive correlation between the change in price of agricultural and industrial products. Similarly, there is a low degree negative correlation between change in output and price in both the agricultural and industrial sectors. Implications: There was a positive relationship between the price of agricultural products and industrial products. Therefore, it is necessary to give high priority to the development of the agricultural sector. Industrial development is impossible without the development of the agricultural sector because they are interdependent with each other. The agricultural sector and industrial sector are uplifted simultaneously. There was a low degree negative correlation between price and output of the product of both the agricultural and industrial sectors. Therefore, output increasing activities must be performed by private and public sectors.

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