scholarly journals Correlating Coating Quality of Coverage with Rheology for Mica-Based Paints

2020 ◽  
Vol 30 (1) ◽  
pp. 119-129
Author(s):  
Jacob Anderson ◽  
Shailesh Shori ◽  
Esmaiel Jabbari ◽  
Harry J. Ploehn ◽  
Francis Gadala-Maria ◽  
...  
Keyword(s):  
Shear Stress ◽  
Hysteresis Loops ◽  
Poor Quality ◽  
Gradual Change ◽  
Visual Appearance ◽  
The Difference ◽  
Good Strain ◽  
Frequency Sweeps ◽  
Visual Properties

Abstract This paper examines the relationship between rheology and the qualitative appearance of dried, mica-based paint coatings used in the aerospace industry. The goal is to identify key rheological characteristics indicative of poor coating visual appearance, providing a screening tool to identify unsatisfactory paint formulations. Four mica paints were studied, having coating visual appearances ranging from very poor to very good. Strain sweeps indicated that the poor-quality paints have a smaller % strain midpoint in the linear visco-elastic range; while the good-quality paints have a lower G’/G” cross-over point in frequency sweeps. Thixotropy experiments utilizing single and multiple-loop hysteresis cycles plotting shear stress as a function of shear rate showed that the base mica paints with good appearance had nearly constant, reversible profiles in the forward and the backward directions; while the mica paints with poor appearance were irreversible with a noticeable gradual change in shear stress as more loops are run. The difference in area between the forward and the reverse curves was determined, leading to a quantifiable criterion that can differentiate good paints from poor paints with significance testing. This work would establish the first rheology model using hysteresis loops to predict the visual properties of mica-based paints.

The Quality Analysis of Hallux Valgus Videos on YouTube

2021 ◽  
Author(s):  
Enes Sari ◽  
Levent FAZLI Umur
Keyword(s):  
Hallux Valgus ◽  
Information Quality ◽  
Statistical Significance ◽  
Poor Quality ◽  
Quality Analysis ◽  
Accurate Information ◽  
Youtube Videos ◽  
The Mean ◽  
The Difference

BACKGROUND:The aim of this study was to evaluate the information quality of YouTube videos on hallux valgus. METHODS:A YouTube search was performed using the keyword 'hallux valgus' to determine the first 300 videos related to hallux valgus. A total of 54 videos met our inclusion criteria and evaluated for information quality by using DISCERN, Journal of the American Medical Association (JAMA) and hallux valgus information assessment (HAVIA) scores. Number of views, time since the upload date, view rate, number of comments, number of likes, number of dislikes, video power index (VPI) values were calculated to determine video popularity. Video length (sec), video source and video content were also noted. The relation between information quality and these factors were statistically evaluated. RESULTS:The mean DISCERN score was 30.35{plus minus}11.56 (poor quality) (14-64), the mean JAMA score was 2.28{plus minus}0.96 (1-4), and the mean HAVIA score was 3.63{plus minus}2.42 (moderate quality) (0.5-8.5). Although videos uploaded by physicians had higher mean DISCERN, JAMA, and HAVIA scores than videos uploaded by non-physicians, the difference was not statistically significant. Additionally, view rates and VPI values were higher for videos uploaded by health channels, but the difference did not reach statistical significance. A statistically significant positive correlation was found between video length and DISCERN (r= 0.294, p= 0.028), and HAVIA scores (r= 0.326, p= 0.015). CONCLUSIONS:This present study demonstrated that the quality of information available on YouTube videos about hallux valgus was low and insufficient. Videos containing accurate information from reliable sources are needed to educate patients on hallux valgus, especially in less frequently mentioned topics such as postoperative complications and healing period.

Life Cycle and Growth of Sericostoma personatum Spence (Trichoptera, Sericostomatidae) in a Danish Spring

1973 ◽  
Vol 4 (4) ◽  
pp. 323-327 ◽  
Keyword(s):  
Life Cycle ◽  
Growth Retardation ◽  
Poor Quality ◽  
The Poor ◽  
Spring Area ◽  
The Difference ◽  
Slight Growth ◽  
Lower Temperature

AbstractIn a Danish spring the life cycle of Sericostoma personatum Spence (syn. S. pedemontanum Mac-Lachlan) took three years. A comparison is made with a I½ year life cycle reported by Elliott (I969). The poor quality of the food and lower temperature in the spring area are suggested as explanations of the difference. A slight growth retardation was found for all three year classes in winter and was referred to lower temperatures.

Mitigating imperfect data validity in administrative data PSIs: a method for estimating true adverse event rates

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Bastien Boussat ◽  
Hude Quan ◽  
Jose Labarere ◽  
Danielle Southern ◽  
Chantal M Couris ◽  
...  
Keyword(s):  
Adverse Event ◽  
Poor Quality ◽  
Report Cards ◽  
Hospital Level ◽  
Quality Of Data ◽  
Imperfect Data ◽  
Data Validity ◽  
The Difference ◽  
Event Rates

Abstract Question Are there ways to mitigate the challenges associated with imperfect data validity in Patient Safety Indicator (PSI) report cards? Findings Applying a methodological framework on simulated PSI report card data, we compare the adjusted PSI rates of three hospitals with variable quality of data and coding. This framework combines (i) a measure of PSI rates using existing algorithms; (ii) a medical record review on a small random sample of charts to produce a measure of hospital-specific data validity and (iii) a simple Bayesian calculation to derive estimated true PSI rates. For example, the estimated true PSI rate, for a theoretical hospital with a moderately good quality of coding, could be three times as high as the measured rate (for example, 1.4% rather than 0.5%). For a theoretical hospital with relatively poor quality of coding, the difference could be 50-fold (for example, 5.0% rather than 0.1%). Meaning Combining a medical chart review on a limited number of medical charts at the hospital level creates an approach to producing health system report cards with estimates of true hospital-level adverse event rates.

scholarly journals Image Encryption Scheme Based on Multiscale Block Compressed Sensing and Markov Model

Entropy ◽  
2021 ◽  
Vol 23 (10) ◽  
pp. 1297
Author(s):  
Yuandi Shi ◽  
Yinan Hu ◽  
Bin Wang
Keyword(s):  
Compressed Sensing ◽  
Markov Model ◽  
Image Encryption ◽  
Sampling Rate ◽  
Coefficient Matrix ◽  
Poor Quality ◽  
Encryption Scheme ◽  
Block Compressed Sensing ◽  
The Difference

Many image encryption schemes based on compressed sensing have the problem of poor quality of decrypted images. To deal with this problem, this paper develops an image encryption scheme by multiscale block compressed sensing. The image is decomposed by a three-level wavelet transform, and the sampling rates of coefficient matrices at all levels are calculated according to multiscale block compressed sensing theory and the given compression ratio. The first round of permutation is performed on the internal elements of the coefficient matrices at all levels. Then the coefficient matrix is compressed and combined. The second round of permutation is performed on the combined matrix based on the state transition matrix. Independent diffusion and forward-backward diffusion between pixels are used to obtain the final cipher image. Different sampling rates are set by considering the difference of information between an image’s low- and high-frequency parts. Therefore, the reconstruction quality of the decrypted image is better than that of other schemes, which set one sampling rate on an entire image. The proposed scheme takes full advantage of the randomness of the Markov model and shows an excellent encryption effect to resist various attacks.

scholarly journals The Heterogenous Demand for Urban Parks between Home Buyers and Renters: Evidence from Beijing

2020 ◽  
Vol 12 (21) ◽  
pp. 9058
Author(s):  
Tianzheng Zhang ◽  
Yingxiang Zeng ◽  
Yingjie Zhang ◽  
Yan Song ◽  
Hongxun Li
Keyword(s):  
Urban Parks ◽  
Poor Quality ◽  
Internal Quality ◽  
Property Management ◽  
Management Service ◽  
Hedonic Price ◽  
Price Model ◽  
The Difference ◽  
Different Levels

Many studies have confirmed that there is demand among urban residents and renters for urban parks. Moreover, as renters and home buyers have very different levels of ownership over their housing resources, their demands for amenities can be heterogenous. To discover and identify such heterogeneous demands is worthy of attention. Using the micro-housing resale transactions and listing data for housing leases in Beijing during 2019, this paper explores the difference between the demand for urban parks among home buyers and renters outside the community from the perspective of the internal quality of the community by using the hedonic price model (HPM). Specifically, from the dimension of the property management service fee and greening rate, we find that for home buyers, compared to residents living in relatively poor-quality communities, a better-quality community will reduce the demand for urban parks outside the community. Conversely, for renters, the higher the quality of the community is, the higher the demand for urban parks outside the community will be.

Ego Distortion in Terms of True and False Self

2016 ◽  
pp. 159-172 ◽  
Author(s):  
Donald W. Winnicott
Keyword(s):  
Quality Of Life ◽  
Infant Development ◽  
Positive Function ◽  
Poor Quality ◽  
True Self ◽  
False Self ◽  
The Subject ◽  
The Difference ◽  
Symbol Use

In this paper on the subject of the True and False Self, Winnicott locates the area of this conceptualization as arising out of recognition of the difference of Ego versus Id in both infant development and analytic work with patients. Winnicott sees the False Self arising in the first object-relationships, where its positive function is to hide the True Self. Only the True Self can be spontaneous, creative and feel real. Where there is a pronounced split between the True and False Self, there is a poor capacity for symbol use and a poor quality of life. In analysis, the patient’s False Self can collaborate indefinitely with the analyst in the analysis of defences, but the real issues remain untouched. Suicide, which may occur in this context, is the destruction of the total self in avoidance, in fantasy, of the feared annihilation of the True Self.

scholarly journals Psychological Impact and Sleep Quality in the COVID-19 Pandemic in Brazil, Colombia and Portugal

Duazary ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 120-130
Author(s):  
Ubaldo Enrique Rodríguez-De Avila ◽  
Fabíola Rodrigues-De França ◽  
Maria de Fátima Jesus Simões
Keyword(s):  
Sleep Quality ◽  
Psychological Impact ◽  
Poor Quality ◽  
South American ◽  
Quality Of Sleep ◽  
Online Questionnaire ◽  
Significant Difference ◽  
The Difference ◽  
Good Sleep

The objective of the study was to evaluate, through an online questionnaire, aspects related to levels of anxiety, suicidal thoughts and quality of sleep during the COVID-19 pandemic period in three countries. With 988 participants from Colombia, Brazil and Portugal. 2.1% of the subjects presented mild anxiety, 85.5% moderate levels, 12% ranged from moderate to severe and 0.3% had an extreme level of anxiety. Suicidal thinking was found at the 57% level; 31.1% moderate, 9.7% marked severe, and 2.2% extreme. Regarding sleep, 14% had good sleep quality, 53.5% poor quality and 32.5% possible sleep disorders. The difference between the values ​​of anxiety and suicidal ideation between countries was not significant. However, there is a significant difference between the distribution of sleep quality values ​​between countries. The differences are mainly between adolescents (<22 years) and other ages. Colombia differs from Brazil and Portugal in terms of quality of sleep. In addition to the health problems brought by the Covid-19 pandemic, this study showed that the adolescent population is more vulnerable to the psychological impacts and quality of sleep in countries of the South American continent.

Letter to the Editor: The Continuing Challenge of Evaluating RSD Impairment and Disability

1998 ◽  
Vol 3 (5) ◽  
pp. 8-10
Author(s):  
Robert L. Knobler ◽  
Charles N. Brooks ◽  
Leon H. Ensalada ◽  
James B. Talmage ◽  
Christopher R. Brigham
Keyword(s):  
Disability Evaluation ◽  
Body Part ◽  
Loss Of Function ◽  
Regulatory Requirements ◽  
Major Cardiac Event ◽  
Clinical Scenarios ◽  
Impairment Score ◽  
Occupational Activities ◽  
The Difference

Abstract The author of the two-part article about evaluating reflex sympathetic dystrophy (RSD) responds to criticisms that a percentage impairment score may not adequately reflect the disability of an individual with RSD. The author highlights the importance of recognizing the difference between impairment and disability in the AMA Guides to the Evaluation of Permanent Impairment (AMA Guides): impairment is the loss, loss of use, or derangement of any body part, system, or function; disability is a decrease in or the loss or absence of the capacity to meet personal, social, or occupational demands or to meet statutory or regulatory requirements because of an impairment. The disparity between impairment and disability can be encountered in diverse clinical scenarios. For example, a person's ability to resume occupational activities following a major cardiac event depends on medical, social, and psychological factors, but nonmedical factors appear to present the greatest impediment and many persons do not resume work despite significant improvements in functional capacity. A key requirement according to the AMA Guides is objective documentation, and the author agrees that when physicians consider the disability evaluation of people, more issues than those relating to the percentage loss of function should be considered. More study of the relationships among impairment, disability, and quality of life in patients with RSD are required.

An experience of performing spirometry by trained general practitioners

2020 ◽  
pp. 34-36
Author(s):  
M. A. Pokhaznikova ◽  
E. A. Andreeva ◽  
O. Yu. Kuznetsova
Keyword(s):  
General Practitioners ◽  
Quality Criteria ◽  
Poor Quality ◽  
Male Gender ◽  
Study Research ◽  
The Poor ◽  
Quality Of Research ◽  
Forced Expiratory Maneuver ◽  
Maximal Effort

The article discusses the experience of teaching and conducting spirometry of general practitioners as part of the RESPECT study (RESearch on the PrEvalence and the diagnosis of COPD and its Tobacco-related aetiology). A total of 33 trained in spirometry general practitioners performed a study of 3119 patients. Quality criteria met 84.1% of spirometric studies. The analysis of the most common mistakes made by doctors during the forced expiratory maneuver is included. The most frequent errors were expiration exhalation of less than 6s (54%), non-maximal effort throughout the test and lack of reproducibility (11.3%). Independent predictors of poor spirogram quality were male gender, obstruction (FEV1 /FVC<0.7), and the center where the study was performed. The number of good-quality spirograms ranged from 96.1% (95% CI 83.2–110.4) to 59.8% (95% CI 49.6–71.4) depending on the center. Subsequently, an analysis of the reasons behind the poor quality of research in individual centers was conducted and the identified shortcomings were eliminated. The poor quality of the spirograms was associated either with the errors of the doctors who undertook the study or with the technical malfunctions of the spirometer.

COMBINATORIAL POLYNOMIALLY COMPUTABLE CHARACTERISTICS OF SUBSTITUTIONS AND THEIR PROPERTIES

2020 ◽  
Vol 7 (2) ◽  
pp. 34-41
Author(s):  
VLADIMIR NIKONOV ◽  
◽  
ANTON ZOBOV ◽  
Keyword(s):  
Mathematical Expectation ◽  
Point Of View ◽  
Small Range ◽  
Computational Point ◽  
Wide Range ◽  
Bijective Function ◽  
The Difference ◽  
Element Base ◽  
Selection Of

The construction and selection of a suitable bijective function, that is, substitution, is now becoming an important applied task, particularly for building block encryption systems. Many articles have suggested using different approaches to determining the quality of substitution, but most of them are highly computationally complex. The solution of this problem will significantly expand the range of methods for constructing and analyzing scheme in information protection systems. The purpose of research is to find easily measurable characteristics of substitutions, allowing to evaluate their quality, and also measures of the proximity of a particular substitutions to a random one, or its distance from it. For this purpose, several characteristics were proposed in this work: difference and polynomial, and their mathematical expectation was found, as well as variance for the difference characteristic. This allows us to make a conclusion about its quality by comparing the result of calculating the characteristic for a particular substitution with the calculated mathematical expectation. From a computational point of view, the thesises of the article are of exceptional interest due to the simplicity of the algorithm for quantifying the quality of bijective function substitutions. By its nature, the operation of calculating the difference characteristic carries out a simple summation of integer terms in a fixed and small range. Such an operation, both in the modern and in the prospective element base, is embedded in the logic of a wide range of functional elements, especially when implementing computational actions in the optical range, or on other carriers related to the field of nanotechnology.

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