scholarly journals Uncertainty of Measurement of Bulk and Shaken Density of Pulgran and Salmag

2020 ◽  
Vol 24 (3) ◽  
pp. 73-81
Author(s):  
Janusz Nowak ◽  
Wojciech Przystupa ◽  
Anna Krawczuk
Keyword(s):  
Statistical Analysis ◽  
Nitrogen Fertilizer ◽  
Central Office ◽  
Average Density ◽  
Test Results ◽  
Uncertainty Of Measurement ◽  
Error Sources ◽  
Significant Difference ◽  
Level Of Significance ◽  
The Impact

AbstractThe article presents results of research on the bulk and shaken density of two commercial fertilizers: Pulgran urea and universal nitrogen fertilizer Salmag. A statistical analysis of the obtained results of average density at the assumed level of significance proved a significant difference between shaken and bulk density investigated with the use of Engelsmann apparatus and shaken density tested with a laboratory shaker for both investigated fertilizers. The obtained test results and uncertainty of the measured values served for calculation of uncertainty of the standard complex bulk and shaken density determined in case of many uncertainties. Further, an analysis of the impact of error sources on the value of complex uncertainty was conducted. The final results of the measurement were presented according to the convention of the Central Office of Measures.

scholarly journals Effect of the ketoprofen on the preemptive analgesia in female cats undergoing to ovariohysterectomy

Revista CERES ◽  
2017 ◽  
Vol 64 (1) ◽  
pp. 18-24
Author(s):  
Dayvid Vianêis Farias de Lucena ◽  
Fernanda Vieira Henrique ◽  
Amara Gyane Alves de Lima ◽  
Almir Pereira de Souza ◽  
Pedro Isidro da Nóbrega Neto
Keyword(s):  
Statistical Analysis ◽  
Preemptive Analgesia ◽  
Pain Scores ◽  
Significant Difference ◽  
Reduction Of Pain ◽  
Baseline Values ◽  
Student’S T ◽  
Level Of Significance ◽  
Postoperative Administration ◽  
Student’S T Test

ABSTRACT The objective of this study was to investigate the effect of the ketoprofen on the preemptive analgesia in female cats submitted to ovariohysterectomy. Sixteen healthy cats were distributed into two groups, with eight animals each, by means of a draw, in a preemptive group (PREG), in which the animal received ketoprofen (1 mg/kg) subcutaneously two hours before the surgery; and postsurgery group (POSG), in which ketoprofen (1 mg/kg) was administered subcutaneously immediately after surgery. In both groups, ketoprofen was given 24, 48 and 72 hours after the first adminstration. Heart and respiratory frequencies and glycemia were measured in all animals during the days first ten postsurgery. Analgesia was measured by assigning scores at zero, two, four, six, 12, 24, 48, 72, 96, 120, 144, 168, 192, 216 and 240 hours after the surgical procedure. Statistical analysis was performed using two-way analysis of variance followed by Tukey's test to compare the moments and Student's t-test for comparison between groups. Pain scores were evaluated using test of U-Mann-Withney or Kruskall-Wallis, all at the 5% level of significance. Pain scores were significantly lower in PREG in M0, M6, M72, M96 and M120. No significant difference was found in the levels of glycemia in comparison to baseline values. Ketoprofen promotes postsurgery analgesia in female cats submitted to ovariohysterectomy and preemptive and postsurgery administration provides an earlier reduction of pain scores when compared to postoperative administration, only.

scholarly journals Fuel and lubricant consumption in felling the young oak-hornbeam stands

2002 ◽  
pp. 59-66
Author(s):  
Vojislav Bajic ◽  
Milorad Danilovic
Keyword(s):  
Statistical Analysis ◽  
Analysis Of Variance ◽  
Unit Area ◽  
Function Form ◽  
Tree Diameter ◽  
Significant Difference ◽  
The Difference ◽  
Level Of Significance ◽  
Average Consumption

Based on the elements of statistical analysis on the dependence of fuel and lubricant consumption on tree diameter, it was assessed that with the increase of tree diameter, the fuel and lubricant consumption in the young oak and hornbeam stands decreases significantly, both in clear felling and in thinning and that the function form Y=exp(a+b x X?1) is the best description of the correlation The consumption of fuel compared to lubricant consumption is almost double, which agrees with the results of the previous studies. Average consumption of fuel and lubricant is 17.43 mL x tree?1, on the plots 20.27 mL x tree?1, average consumption of lubricant per tree on skid roads is 9.4 mL x tree?1, on the plots 11 mL x tree?1. The higher consumption of fuel and lubricant on the plots with selective thinning is the consequence of the longer time needed for the conversion per tree, compared to that in clear felling The consumption of fuel per unit area on the skid roads (clear felling) is 22.9 L x ha?1, on the plots (selective thinning) 7.6 L x ha?1. The consumption of lubricant on the skid roads is 13.3 L x ha?1, on the plots 4.29 L x ha?1. The higher consumption of fuel and lubricant per unit area on the skid roads is due to the difference in the number of trees per unit area Based on the results of the analysis of variance, it was found out that between fuel and lubricant consumption in selective thinning and in felling the trees along tractor skid roads there is no statistically significant difference at the level of significance of 95%. So, for practical purposes, the unique norms of consumption can be established for the stands similar to those in which the study was performed.

scholarly journals The Impact of Selected Parameters on the Condition of Activated Sludge in a Biologic Reactor in the Treatment Plant in Nowy Targ, Poland

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2657
Author(s):  
Elwira Nowobilska-Majewska ◽  
Piotr Bugajski
Keyword(s):  
Wastewater Treatment ◽  
Statistical Analysis ◽  
Activated Sludge ◽  
Partial Correlation ◽  
Oxygen Uptake Rate ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Test Results ◽  
Partial Correlation Analysis ◽  
The Impact

The aim of this study was to determine the condition of activated sludge in the biologic reactor located in the collective wastewater treatment plant in Nowy Targ (Poland) based on OUR tests in the aspect of the impact of sludge’s concentration in the biologic reactor and dependence of BOD5/TN and BOD5/TP in wastewater flowing into the biologic reactor. The analysis was conducted based on test results from 61 samples of activated sludge taken from the biologic reactor and 61 samples of wastewater flowing into the biologic reactor. The analysis included the concentration of sludge in the biologic reactor. The following indicators were analyzed in wastewater flowing into the reactor: biochemical oxygen demand (BOD5), total nitrogen (TN) and total phosphorus (TP). The statistical analysis concerning the impact of the analyzed factors on oxygen uptake rate (OUR) tests was developed based on the Pearson’s correlation coefficient and partial correlation of many variables. Based on the results of the partial correlation analysis, nomograms were developed to determine the condition of activated sludge microorganisms (OUR) based on the BOD5/TN and BOD5/TP connection and knowledge of the sludge concentration in the bioreactor of the treatment plant. The presented nomograms can be formulated for each bioreactor based on activated sludge technology related the load of organic and biogenic pollutants in the wastewater flowing into the bioreactor and the concentration of the sludge in the bioreactor.

The Perception of Managers on the Impacts of the Internet in Brazilian Hotels

2003 ◽  
pp. 244-259 ◽  
Author(s):  
Luiz A.M.M. Filho ◽  
Anatália S.M. Ramos
Keyword(s):  
Analysis Of Variance ◽  
Internet Use ◽  
The Internet ◽  
Test Results ◽  
Communication Tool ◽  
Tukey Test ◽  
Significant Difference ◽  
The Impact ◽  
The City

The present study has an exploratory nature and aims to analyze the perception of managers on the efficiency, access importance, use as a communication tool, benefits and difficulties of Internet use in Brazilian hotels and also its effects according to the facilities rank and property size plus managers’ age and experience time. It has been used as a questionnaire to collect data from the managers of 35 hotels in the city of Natal, RN, Brazil. By using analysis of variance (ANOVA) and the Tukey test, results showed that there is almost no significant difference on the perception of managers on the impact of Internet use in hotels. However, those variables that were different show that for younger and less experienced managers and luxurious hotels with more than 50 rooms, there is a more favorable perception on the impacts of the Internet.

A Measure to Detect Sleep Onset Using Statistical Analysis of Spike Rhythmicity

2014 ◽  
Vol 3 (1) ◽  
pp. 27-41 ◽  
Author(s):  
B.R. Purnima ◽  
N. Sriraam ◽  
U. Krishnaswamy ◽  
K. Radhika
Keyword(s):  
Statistical Analysis ◽  
Sleep Onset ◽  
Rank Test ◽  
P Value ◽  
Sleep State ◽  
Statistical Measures ◽  
Plot Analysis ◽  
Significant Difference ◽  
Signed Rank Test ◽  
The Impact

Electroencephalogram (EEG) signals derived from polysomnography recordings play an important role in assessing the physiological and behavioral changes during onset of sleep. This paper suggests a spike rhythmicity based feature for discriminating the wake and sleep state. The polysomnography recordings are segmented into 1 second EEG patterns to ensure stationarity of the signal and four windowing scheme overlaps (0%, 50%, 60% and 75%)of EEG pattern are introduced to study the influence of the pre-processing procedure. The application of spike rhythmicity feature helps to estimate the number of spikes from the given pattern with a threshold of 25%.Then non parametric statistical analysis using Wilcoxon signed rank test is introduced to evaluate the impact of statistical measures such as mean, standard deviation, p-value and box-plot analysis under various conditions .The statistical test shows significant difference between wake and sleep with p<0.005 for the applied feature, thus demonstrating the efficiency of simple thresholding in distinguishing sleep and wake stage .

Skin color and investment performance in South Africa's mutual funds industry

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Nixon S. Chekenya ◽  
Shingirai Sikomwe
Keyword(s):  
South Africa ◽  
Statistical Difference ◽  
White Male ◽  
Mean Difference ◽  
Test Results ◽  
Ceteris Paribus ◽  
Content Type ◽  
Fund Managers ◽  
Significant Difference ◽  
Level Of Significance

PurposeUsing data for the period 1965–2016, we investigate whether there are systematic differences between the investment performance of Black fund managers and those of other races in South Africa and whether investors recognize these differences. The two-tailed test results show that there is no significant difference between the two means considering the 12 months yield return at a hypothesized mean difference of zero. There is no statistical difference at 5% level of significance implying that the performance of Black fund managers is as equally as that of managers of other races. Our results also show that the percentage of Black fund managers in South Africa is still too low even as the workforce gets diverse. There's no single explanation for what is happening in this industry. The findings cannot be explained by differences in fund characteristics such as age, total assets under management or expenses or from the performance lenses. The results seem hard to reconcile with an explanation of differences in portfolio characteristics such as return volatility or market, size, value and momentum exposures.Design/methodology/approachWe test the glass cliff hypothesis by employing conditional logistic regression (CLR). The approach enables the use of case/control style of analysis where White/majority fund managers are the control population and professional minorities are the case group. The selection of these as fund managers is our event or outcome variable. To test savior effect hypothesis, we employ analysis of variance (ANOVA). The technique enables us to compare variances between the groups: when a White male fund manager replaces a professional minority, when a White male fund manager replaces a White male fund manager and when a professional minority replaces a professional minority.FindingsOur analyses so far have documented a woeful underrepresentation of Black fund managers in South Africa's mutual funds industry. We explore potential explanations for these trends. Our analysis is meant to be suggestive. Are Blacks, women, people of color and ethnic minorities finding success in the investment industry? Are they having rewarding and fulfilling careers? Or is the industry still homogenous (just a White man's world) with a thin veneer of diversity layered on for public relations effect? The percentage of Black fund managers in South Africa is still too low even as the workforce gets diverse. There is no single explanation for what is happening in this industry. The findings cannot be explained by differences in fund characteristics such as age, total assets under management or expenses or from the performance lenses. Also, the results seem hard to reconcile with an explanation of differences in portfolio characteristics such as return volatility or market, size, value and momentum exposures.Research limitations/implicationsThe two-tailed test results show that there is no significant difference between the two means considering the 12 months yield return at a hypothesized mean difference of zero. There is no statistical difference at 5% level of significance. Our results so far establish that, ceteris paribus, the performance of Black fund managers is as equally as that of managers of other races.Practical implicationsThe two-tailed test results show that there is no significant difference between the two means considering the 12 months yield return at a hypothesized mean difference of zero. There is no statistical difference at 5% level of significance. Our results so far establish that, ceteris paribus, the performance of Black fund managers is as equally important as that of managers of other races.Social implicationsThe two-tailed test results show that there is no significant difference between the two means considering the 12 months yield return at a hypothesized mean difference of zero. There is no statistical difference at 5% level of significance. Our results so far establish that, ceteris paribus, the performance of Black fund managers is as equally important as that of managers of other races.Originality/valueThis paper investigates whether there are systematic differences between the investment performance of Black fund managers and those of other races in South Africa and whether investors recognize these differences. Our hypothesis is that due to Broad-Based Black Economic Empowerment (BBBEE) laws in the country and possibly, due to a perception of discrimination in the market, it is only Black fund managers with superior fund management skills that enter the profession. As such, we expect to find superior performance among Black fund managers. We also conjecture that investors recognize this phenomenon and reward Black fund managers with more fund flows and more investment mandates than others.

scholarly journals How Knowledge-Hiding Behavior Among Manufacturing Professionals Influences Functional Interdependence and Turnover Intention

2021 ◽  
Vol 12 ◽  
Author(s):  
Lalatendu Kesari Jena ◽  
Deepika Swain
Keyword(s):  
Statistical Analysis ◽  
Turnover Intention ◽  
Positive Association ◽  
Significant Loss ◽  
Workplace Incivility ◽  
Significant Difference ◽  
Uncivil Behaviors ◽  
Hiding Behavior ◽  
Knowledge Hiding ◽  
The Impact

Objectives: Knowledge hiding is inappropriate behavior of employees at the workplace that makes the entire organization suffer a subtle yet significant loss. Lack of sharing makes the journey of learning an arduous process. This, in turn, gives rise to a series of uncivil behaviors, hence resulting in a decrease of functional interdependence (FI). The cascading result toll is a turnover intention (TI), resting only after turnover—an actual separation from the employer. Statistical analysis of the empirical data collected depicts the intensity of influence of FI and TI as a result of the knowledge-hiding behavior.Methods: Three hundred sixty-three executives employed in three public and two private manufacturing organizations in eastern India were the respondents in our study. To analyze the difference in variables of the study, a t-test was carried out. The statistical findings suggest no significant difference among study variables. This specifies that, despite a considerable difference in levels of management, there was no significant difference in perceiving workplace incivility, knowledge-hiding behavior, FI, and TI items of our instruments.Results: Correlation findings show a negative association between workplace incivility and functional interdependence (r = −0.37 when the value of p is &lt;0.01) and a positive association among workplace incivility and turnover intention (r = 0.32 when the value of p is &lt;0.01). The condensed effect of workplace incivility (β = −0.59 when the value of p is &lt;0.001) along with an important presence of knowledge-hiding behavior (β = −0.68 when the value of p is &lt;0.01) when the dependent variable is FI indicates that knowledge-hiding behavior is mediating a partial association among workplace incivility and FI. Similarly, the effect of workplace incivility (β = 0.43 when the value of p is &lt;0.01) is decreased when the impact of knowledge-hiding behavior (β = 0.66 when the value of p is &lt;0.001) was sizeable with TI being the dependent variable.Conclusion: The effect of knowledge hiding is inversely proportional to FI, whereas sharing has a direct relation with TI. An exhaustive data sample and a rigorous statistical analysis may give a clear picture of the amount of impact of TI and FI due to the lack of knowledge sharing and/or knowledge hiding.

scholarly journals Assessment of the impact of COVID-19 pandemic on emotional and nutritional status of university athletes

2021 ◽  
Vol 25 (1) ◽  
pp. 43-50
Author(s):  
Gökmen Özen ◽  
Günay Eskici ◽  
Hüseyin Ö. Yurdakul ◽  
Hürmüz Koç
Keyword(s):  
Statistical Analysis ◽  
Emotional Eating ◽  
Emotional State ◽  
Elite Athletes ◽  
Categorical Variables ◽  
Fluid Consumption ◽  
Nutritional Behavior ◽  
Significant Difference ◽  
The Impact ◽  
University Athletes

Background and Study Aim. The current study was carried out to analyze the impact of COVID-19 pandemic on the emotional state and nutritional behavior of university athletes. Material and Methods. This research was carried out during the first wave of COVID-19 in Turkey. A total of 334 (162 female and 172 male) athletes who are undergraduate students in the faculties of sports sciences of universities participated in the study. Their mean age was 21.46 ± 3.7. The Emotional Eating Scale (EES) was used to determine the nutritional behavior of the participants and The Profile of Mood States (POMS) scale was used to determine their emotional state. The Chi-square and Cross-tabulation tests were used for the statistical analysis of categorical variables. Mann Whitney U test was used for the analysis of continuous variables, and Spearman Sequence Correlation test protocols were used for correlation analysis. Results. The results of the statistical analysis revealed that there was a significant increase in the amount of fluid consumption of elite athletes. There was a significant relationship between negative mood and emotional eating sub-assessment (p <0.05). However, it was found that there was no significant difference between total and subscale scores of amateur and elite athletes (p >0.05). Conclusion. As a result of the research, it was seen that elite and amateur athletes did not have a significant difference in emotional eating and mood status, except for the amount of fluid consumption. The increase in negative emotions of university athletes is an important factor that increased their emotional eating behavior.

scholarly journals Impact of thymoquinone supplementation on immobilisation stress-induced changes in reproductive characteristics of male mice

2014 ◽  
Vol 6 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Suzanah Abdul Rahman ◽  
Norul Athirah Mohamed Anwar ◽  
Shaik Sadak Basha ◽  
Saheera Kamarzaman
Keyword(s):  
Intraperitoneal Injection ◽  
Sperm Count ◽  
Reproductive Parameters ◽  
Group I ◽  
Testicular Weight ◽  
Significant Difference ◽  
Immobilisation Stress ◽  
Level Of Significance ◽  
Induced Changes ◽  
The Impact

The aim of the current study was to investigate changes in the reproductive parameters during stress and the impact of thymoquinone during the period. The effects of stress were measured through immobilisation stress on mice. Group I was administered normal saline daily via intraperitoneal injection while Groups II and III were subjected to 2 and 6 hours of immobilisation stress respectively. Groups IV and V were subjected to stress for 2 and 6 hours respectively followed by intraperitoneal injection of 10 mg/kg thymoquinone which was continued on alternate days. The level of significance was set at p<0.05 and statistical analysis showed significant difference in testicular weight of mice in groups II and III compared to the controls but no significant difference was obtained for sperm count between all groups. Sperm motility, however, was significantly different among the groups under stress for 2 and 6 hours and that of 6 hours with the treatment of thymoquinone when compared to the controls. The histology of the testes also indicated a few alterations in comparison to the controls in the germinal epithelium and spermatogenic pattern in groups III and V.

scholarly journals Impact Of Metacognitive Awareness On Performance Of Students In Chemistry

2010 ◽  
Vol 3 (10) ◽  
pp. 39 ◽  
Author(s):  
Fazal ur Rahman ◽  
Nabi Bux Jumani ◽  
Muhammad Ajmal Chaudry ◽  
Saeed ul Hasan Chisti ◽  
Fahim Abbasi
Keyword(s):  
Female Students ◽  
Metacognitive Awareness ◽  
Science Students ◽  
Test Results ◽  
Male And Female ◽  
Significant Difference ◽  
The Subject ◽  
The Impact

The impact of metacognitive awareness on students’ performance has been examined in the present study. 900 students of grade X participated in the study.  Metacognitive awareness was measured using inventory, while performance of students was measured with the help of researcher made test in the subject of chemistry.  Results indicated that metacognitive awareness was significantly correlated with the performance of students.  The highly metacognitively aware science students performed well on the test.  Results further indicated that there was no significant difference in the metacognitive awareness of male and female students.  

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