scholarly journals Rheological Characteristics of Castor oil used as Biodegradable Lubricant

2020 ◽  
Vol 36 (05) ◽  
pp. 973-975
Author(s):  
Ioana Stanciu
Keyword(s):  
Dynamic Viscosity ◽  
Castor Oil ◽  
Correlation Coefficients ◽  
Rheological Characteristics ◽  
Shear Speed ◽  
The One ◽  
Biodegradable Lubricant

In this article I have presented the rheological characteristics of castor oil used as a biodegradable lubricant. The rheograms of castor oil have quite different slopes. The highest slope is at shear speed 3.3s-1, and the smallest slope is at 120s-1. From the representation of the dependence of the dynamic viscosity on the correlation coefficients at all the temperatures at which the castor oil has been was studied, the correlation coefficients have values close to the one value. The correlation coefficients have values between 0.985-0.990.

scholarly journals Study of Rheological Behavior of Olive Oil Used as Biodegradable Lubricant

2021 ◽  
Vol 37 (5) ◽  
pp. 1248-1251
Author(s):  
Ioana Stanciu
Keyword(s):  
Experimental Data ◽  
Olive Oil ◽  
Rheological Behavior ◽  
Dynamic Viscosity ◽  
Correlation Coefficients ◽  
Exponential Fitting ◽  
Dependence Relations ◽  
Biodegradable Lubricant ◽  
Newtonian Behavior

In this article, based on experimental data, we obtained three dependence relations of dynamic viscosity versus temperature by polynomial and exponential fitting. The correlation coefficients have values close to unity which proves that the obtained relations accurately describe the non-Newtonian behavior of olive oil.

Disequilibrium Coefficient: A Bayesian Perspective

2011 ◽  
Vol 10 (1) ◽  
Author(s):  
Helena Brentani ◽  
Eduardo Y Nakano ◽  
Camila B Martins ◽  
Rafael Izbicki ◽  
Carlos Alberto Pereira
Keyword(s):  
Bayesian Methods ◽  
Selection Pressure ◽  
Disease Susceptibility ◽  
Correlation Coefficients ◽  
Significance Test ◽  
Genotyping Error ◽  
Posterior Density ◽  
Hardy Weinberg Equilibrium ◽  
The One ◽  
Zero Equilibrium

Hardy-Weinberg Equilibrium (HWE) is an important genetic property that populations should have whenever they are not observing adverse situations as complete lack of panmixia, excess of mutations, excess of selection pressure, etc. HWE for decades has been evaluated; both frequentist and Bayesian methods are in use today. While historically the HWE formula was developed to examine the transmission of alleles in a population from one generation to the next, use of HWE concepts has expanded in human diseases studies to detect genotyping error and disease susceptibility (association); Ryckman and Williams (2008). Most analyses focus on trying to answer the question of whether a population is in HWE. They do not try to quantify how far from the equilibrium the population is. In this paper, we propose the use of a simple disequilibrium coefficient to a locus with two alleles. Based on the posterior density of this disequilibrium coefficient, we show how one can conduct a Bayesian analysis to verify how far from HWE a population is. There are other coefficients introduced in the literature and the advantage of the one introduced in this paper is the fact that, just like the standard correlation coefficients, its range is bounded and it is symmetric around zero (equilibrium) when comparing the positive and the negative values. To test the hypothesis of equilibrium, we use a simple Bayesian significance test, the Full Bayesian Significance Test (FBST); see Pereira, Stern and Wechsler (2008) for a complete review. The disequilibrium coefficient proposed provides an easy and efficient way to make the analyses, especially if one uses Bayesian statistics. A routine in R programs (R Development Core Team, 2009) that implements the calculations is provided for the readers.

scholarly journals RESPONSE OF SENSITIVE CORN HYBRIDS TO THE ASSOCIATION OF NICOSULFURON AND TIMING OF NITROGEN APPLICATION

2019 ◽  
Vol 17 (2) ◽  
pp. 27
Author(s):  
Heitor Franco de Sousa ◽  
Paulo César Timossi ◽  
Antônio Paulino da Costa Netto ◽  
Claudio Hideo Martins Costa
Keyword(s):  
Grain Yield ◽  
Correlation Coefficients ◽  
Nitrogen Fertilizers ◽  
Nitrogen Application ◽  
Corn Hybrids ◽  
Corn Crop ◽  
Coated Urea ◽  
The One

Nicosulfuron is an herbicide used in corn crop for controlling weeds, some hybrids are sensitivity to nicosulfuron even more when it is applied near to the application of nitrogen fertilizers. Thus, this study aimed to evaluate the response of sensitive corn hybrids to association of urea and coated urea applied near to nicosulfuron application on V4 corn stage. P 3646 hybrid was the most sensitive, and urea and coated urea applied near to nicosulfuron had significant effect on corn growth for all hybrids. Most hybrids showed high or significant (p < 0.10) correlation coefficients for grain yield, cob length and row per ear. SYN 7341 hybrid was the one that showed better results in grain yield with urea and nicosulfuron combination. Coated urea should not be applied after V8corn stage when nicosulfuron is applied at V4.

Changes in Skill Intensity in Indian Manufacturing Industry: Some Important Determinants

2015 ◽  
Vol 2 (2) ◽  
pp. 1-18
Author(s):  
Bharat Singh
Keyword(s):  
Manufacturing Industry ◽  
Correlation Coefficients ◽  
Manufacturing Industries ◽  
Policy Framework ◽  
Skilled Workers ◽  
New Economic Policy ◽  
Explanatory Variables ◽  
Skill Intensity ◽  
Multiple Correlation Coefficients ◽  
The One

The formulation and adoption of a new economic policy during the year 1991 which mainly focused on privatisation of Public Sector Undertakings (PSUs), liberalisation of regulations relating to trade, industries and globalisation of the Indian economy can be said to have facilitated the increased control of owners of capital over the production processes through their representatives, the managers, professionals and technocrats. This process has necessitated the change in demand for non-production and production workers in a firm or industry. Using the ASI data at 2-digit level an attempt has been made in this paper to identify some important factors which might have acted as important determinants of changes in the demand for non-production workers or skilled workers in Indian manufacturing industries. For this purpose the multiple correlation coefficients was computed between NP/P (dependent variable) on the one hand and various explanatory variables on the other. It was observed that the variables identified as important determinants of changes in the relative demand for the non-production workers (skilled workers) in Indian manufacturing industries exert their influence in different directions and in varying degrees on a particular industry and across industries also. Hence the policies formulated and implemented to augment the level of productivity and employment should be industry specific under the broad industrial policy framework

scholarly journals EFFECT OF THE MOLECULAR MASS OF POLYVINYLBUTIRAL ON THE PROPERTIES OF POLYMERS BASED ON PHOSPHORUS-CONTAINING DIMETHACRYLATE

2020 ◽  
pp. 60-65
Author(s):  
P. S. Goncharova ◽  
G. V. Korobejnikov ◽  
E. V. Pavlenko ◽  
S. V. Borisov ◽  
M. A. Vaniev ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Elastic Modulus ◽  
Molecular Mass ◽  
Dynamic Viscosity ◽  
Oxygen Index ◽  
Constant Level ◽  
Rheological Characteristics ◽  
Phosphorus Containing

The effect of the molecular weight of polyvinylbutyral dissolved in phosphorus-containing dimethacrylate on the rheological characteristics of solutions and the properties of polymers based on them has been studied. It was found that the dynamic viscosity of solutions containing 3% PVB with a molecular weight of 43,000, 57,000, and 95,000 g/mol compared with the viscosity of the phosphorus-containing dimethacrylate itself significantly increases. Depending on the molecular mass of polyvinylbutyral, materials obtained under the conditions of photochemically initiated polymerization are characterized by an increase of the elastic modulus during static bending up to 53% at a constant level of oxygen index values.

scholarly journals Mixed Methods in Tactical Analysis Through Polar Coordinates and Function Estimation: The Transition Play in ACB Basketball

2021 ◽  
Vol 3 ◽  
Author(s):  
José Luis Pastrana-Brincones ◽  
Belén Troyano-Gallegos ◽  
Juan Pablo Morillo-Baro ◽  
Raimundo López de Vinuesa-Piote ◽  
Juan Antonio Vázquez-Diz ◽  
...  
Keyword(s):  
Ad Hoc ◽  
High Reliability ◽  
Reliability And Validity ◽  
Correlation Coefficients ◽  
Polar Coordinates ◽  
Function Estimation ◽  
Mating Behaviors ◽  
The One ◽  
High Level ◽  
And Function

Nowadays, getting advantageous offensive situations in high-level basketball is being increasingly harder, so taking advantage of any situation in the game since the team has the ball is essential to be competitive. Therefore, the goal to achieve in this study is to evaluate using a mixed method strategy the behaviors happening in the application of the technical–tactical means performed in the transition play of professional basketball in Spain. An ad hoc observation tool made of 11 criteria and 83 exhaustive and mutually exclusive categories (E/ME) has been designed and validated by means of data quality and generalizability analyses. Indexes obtained show high reliability and validity allowing the proposed actions to be recorded (correlation coefficients are above 0.95 and generalizability coefficients are above 0.90 in all cases). A total number of 128 situations corresponding to eight games of Unicaja de Málaga in the Endesa League in the 18/19 season were observed with the Hoisan software. The analysis of the relationships among behaviors was performed using the polar coordinates technique where the one-on-one initiation, outside the zone, has been used as focal behavior. The estimation of the functions representing the vectors has also been performed to model the best fit that estimates, starting from a focal category, the relationship among this focal behavior and the rest of the mating behaviors for possible future observations. The results show significant relationships between the selected focal behavior and the mating behaviors, showing indications of behaviors allowing tactical interpretation of the game and the definition of intervention programs to improve the performance of the team.

scholarly journals On the Tribological and Oxidation Study of Xanthophylls as Natural Additives in Castor Oil for Green Lubrication

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5431
Author(s):  
Karla J. Moreno ◽  
María Teresa Hernández-Sierra ◽  
José E. Báez ◽  
Eloy Rodríguez-deLeón ◽  
Luis Daniel Aguilera-Camacho ◽  
...  
Keyword(s):  
Castor Oil ◽  
Sliding Friction ◽  
Wear Properties ◽  
Oxidation Study ◽  
Beneficial Effects ◽  
Lubricating Film ◽  
Wear Protection ◽  
Nmr Techniques ◽  
Green Lubricant ◽  
Biodegradable Lubricant

The present study focuses on an introductory analysis of the use of three xanthophylls as additives for green lubricant applications. For this purpose, the additives were characterized by FTIR and 1H-NMR techniques, and the bio-lubricants were described by their physical properties. The effect of the natural compounds on the friction and wear properties of bio-lubricants were evaluated by sliding friction tests under boundary conditions, as confirmed by an analysis of the lubricating film thickness. The antioxidant capacity was analyzed by FTIR spectroscopy. It was observed better wear protection in castor oil with xanthophylls than without these additives. The wear rate was reduced up to 50% compared with neat oil. Lesser beneficial effects were appreciated in friction coefficient since it was increased 25%. The best contribution was observed with astaxanthin as an additive. In addition, a significant improvement in the oxidation of castor oil, complemented with this additive, was exhibited by FTIR analysis. It was found that xanthophylls could be employed as additives for totally biodegradable lubricant applications since they have better tribological and antioxidant behavior than current additives.

scholarly journals A practical introduction to the bootstrap: a versatile method to make inferences by using data-driven simulations

2019 ◽  
Author(s):  
Guillaume A Rousselet ◽  
Cyril R Pernet ◽  
Rand R. Wilcox
Keyword(s):  
Confidence Intervals ◽  
Correlation Coefficients ◽  
Data Driven ◽  
Central Tendency ◽  
Statistical Inferences ◽  
Versatile Technique ◽  
Fit For Purpose ◽  
Using Data ◽  
The One ◽  
Sample Case

The bootstrap is a versatile technique that relies on data-driven simulations to make statistical inferences. When combined with robust estimators, the bootstrap can afford much more powerful and flexible inferences than is possible with standard approaches such as t-tests on means. In this R tutorial, we use detailed illustrations of bootstrap simulations to give readers an intuition of what the bootstrap does and how it can be applied to solve many practical problems, such as building confidence intervals for many aspects of the data. In particular, we illustrate how to build confidence intervals for measures of location, including measures of central tendency, in the one-sample case, for two independent and two dependent groups. We also demonstrate how to compare correlation coefficients using the bootstrap and to perform simulations to determine if the bootstrap is fit for purpose for a particular application. The tutorial also addresses two widespread misconceptions about the bootstrap: that it makes no assumptions about the data, and that it leads to robust inferences on its own. The tutorial focuses on detailed graphical descriptions, with data and code available online to reproduce the figures and analyses in the article (https://osf.io/8b4t5/).

Combination of modal responses in linear spectral method: comparison of different formulae for correlation coefficients

2021 ◽  
pp. 32-42
Author(s):  
Alexander G. Tyapin
Keyword(s):  
Spectral Method ◽  
Static Analysis ◽  
Seismic Design ◽  
Method Comparison ◽  
Correlation Coefficients ◽  
Design Analysis ◽  
Common Method ◽  
The Common ◽  
The One ◽  
Mode Response

Linear-spectral method (LSM) is still the common method for the seismic design analysis. "One-component one-mode" responses, obtained by static analysis in the conventional variant of LSM, are combined twice: first for different modes but for each single excitation component separately, then for the different excitation components. In the alternative LSM variant presented in the Russian code SP 14.13330, first one chooses the "most dangerous" direction of the one-component excitation for each mode; then calculates the "one-mode" response for this excitation, and finally these responses are combined. In both cases the combination is performed using the complete quadratic combination (CQC) rule. Different documents suggest different formulae for the correlation coefficients. In the paper different formulae are compared to each other. The goal is to limit the number of calculated coefficients and decrease the amount of calculations.

Quantitative assessment of German Holstein dairy cattle colostrum and impact of thermal treatment on quality of colostrum viscosity and immunoglobulins

2020 ◽  
Author(s):  
Abdulwahed Ahmed Hassan ◽  
Sebastian Ganz ◽  
Florian Schneider ◽  
Axel Wehrend ◽  
Izhar U.H. Khan ◽  
...  
Keyword(s):  
Refractive Index ◽  
Dairy Cattle ◽  
Dynamic Viscosity ◽  
Correlation Coefficients ◽  
Thermal Treatments ◽  
Heat Treated ◽  
Before And After ◽  
C 30 ◽  
The Impact

Abstract Objective: This study aimed to determine the color, fat, viscosity, IgG concentration, %Brix and refractive index of fresh postpartum colostrum of German Holstein dairy cattle and assess the impact of different thermal treatments on the visual and dynamic viscosity, in association to IgG concentration, of colostrum that can be used for pasteurization process. Results: Of the total 40 fresh postpartum colostrum, the color of colostrum (white-pale yellow to yellow and dark-yellowish), fat (1.4 - 8.2 100 g-1), IgG (4 - 116 mg mL-1), %Brix (8.5 - 35.4%), refractive index (1.3454 - 1.3905 nD), visual (ranging from watery to liquid and thick) and dynamic (4.9 - 219 cp) viscosity, were recorded. Statistical analysis between visual and dynamic viscosity of fresh colostrum showed significant correlation coefficients (rs = 634). Moreover, a significant correlation between viscosity and three IgG concentrations was observed. Heat-treated colostrum showed dynamic viscosity ranged from 25 to 3066 cP, where dynamic viscosity of colostrum before- and after heat-treatment showed no significant correlation. Treated colostrum containing IgG concentration ≤80 mg mL-1 at 60°C/60 min and ≤68 mg mL-1 at 63.5°C/30 min showed no significant change in the viscosity and can successfully be applied for pasteurization of first postpartum colostrum.

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