scholarly journals Influence of Macrotexture and Microtexture on the Skid Resistance of Aggregates

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Bowen Guan ◽  
Jiayu Wu ◽  
Chao Xie ◽  
Jianhong Fang ◽  
Haile Zheng ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Correlation Analysis ◽  
Surface Treatment ◽  
Critical Point ◽  
Friction Surface ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Skid Resistance ◽  
Mean Square

This article intends to study the influence of macrotexture and microtexture on the skid resistance of four types of aggregates. For this purpose, fractal dimension (D), root mean square height (Rq), and Polished Stone Value (PSV) were tested. The Pearson correlation coefficients between PSV and D or Rq in the interval of different polishing cycles were calculated and analyzed with correlation analysis. The relationships between PSV and Rq were also established. The results showed that the PSV development was approximately divided into 3 stages including accelerated attenuation stage, decelerated attenuation stage, and stabilization stage. There is a critical point of the entire polishing cycles. When the number of the polishing cycles exceeds this critical point, microtexture replaces macrotexture to play a major role in the skid resistance of aggregates. In the accelerated attenuation stage, macrotexture plays a major role in the skid resistance of aggregates. In the decelerated attenuation stage and stabilization stage, microtexture gradually plays a major role in the skid resistance of aggregates. Because of roughest microtexture in the stabilization stage, bauxite can provide the highest levels of skid resistance for high friction surface treatment over the long-term period.

scholarly journals Long-term stability of maxillary anterior alignment in non-extraction cases

2013 ◽  
Vol 18 (3) ◽  
pp. 46-53 ◽  
Author(s):  
Luiz Filiphe Gonçalves Canuto ◽  
Marcos Roberto de Freitas ◽  
Karina Maria Salvatore de Freitas ◽  
Rodrigo Hermont Cançado ◽  
Leniana Santos Neves
Keyword(s):  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Term Stability ◽  
Long Term Stability ◽  
Irregularity Index ◽  
Posttreatment Period ◽  
Fixed Appliances ◽  
Maxillary Incisors ◽  
Dental Cast

OBJECTIVE: The purpose of this retrospective study was to evaluate long-term stability of maxillary incisors alignment in cases submitted to non-extraction orthodontic treatment. METHODS: The sample comprised 23 patients (13 female; 10 male) at a mean initial age of 13.36 years (SD = 1.81 years), treated with fixed appliances. Dental cast measurements were obtained at three different time points (T1 - pretreatment, T2 - posttreatment and T3 - long-term posttreatment). Variables assessed in maxillary arch were Little Irregularity Index, intercanine, interpremolar and intermolar widths, arch length and perimeter. The statistical analysis was performed by one-way ANOVA and Tukey tests when necessary. Pearson' correlation coefficients were used to investigate possible associations between the evaluated variables. RESULTS: There was no significant change in most arch dimension measurements during and after treatment, however, during the long-term posttreatment period, it was observed a significant maxillary incisors crowding relapse. CONCLUSION: The maxillary incisors irregularity increased significantly (1.52 mm) during long-term posttreatment. None of the studied clinical factors demonstrated to be predictive of the maxillary crowding relapse.

scholarly journals Assessing the validity of a food frequency questionnaire among low-income women in São Paulo, southeastern Brazil

2010 ◽  
Vol 26 (11) ◽  
pp. 2059-2067 ◽  
Author(s):  
Marly Augusto Cardoso ◽  
Luciana Yuki Tomita ◽  
Elaine Cristina Laguna
Keyword(s):  
Low Income ◽  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Sao Paulo ◽  
Southeastern Brazil ◽  
São Paulo ◽  
Food Frequency ◽  
Low Income Women

This study describes the validity of a food frequency questionnaire (FFQ) in 93 low-income women (20-65 years), participating in a case-control study in São Paulo, Brazil. Two FFQ (FFQ1 and FFQ2, 12 months apart) and three 24-hour dietary recalls (24hR) were conducted between 2003 and 2004 to estimate dietary intake during the past year. The Pearson correlation coefficients (crude, energy-adjusted and de-attenuated) were used for comparisons between FFQ and 24hR. The agreement between the methods was further examined by the Bland-Altman analysis. For the assessment of long-term reliability, the energy-adjusted intra-class correlation coefficients were mostly around 0.40, but higher for vitamin A and folate (0.50-0.56). Energy-adjusted, attenuation-corrected Pearson validity correlations between FFQ and DR ranged from 0.30-0.54 for macronutrients to 0.20-0.48 for micronutrients, with higher value for calcium (0.75). There were small proportions of grossly misclassified nutrient intakes, while Bland-Altman plots indicated that the FFQ is accurate in assessing nutrient intake at a group level.

A Separation Method of 3D Engineering Surface with Correlation Analysis of NSCT Sub-Bands

2012 ◽  
Vol 248 ◽  
pp. 443-449
Author(s):  
Ming Wei Chui ◽  
You Qian Feng ◽  
Wei Wang ◽  
Xiao Dong Xu ◽  
Zheng Chao Li
Keyword(s):  
Correlation Analysis ◽  
Surface Topography ◽  
Pearson Correlation ◽  
Correlation Method ◽  
Correlation Coefficients ◽  
Separation Method ◽  
Real Surface ◽  
Nonsubsampled Contourlet Transform ◽  
Filtering Method ◽  
Frequency Components

The 3D engineering surfaces are comprised of a range of spatial frequency components, such as form, waviness and roughness. Filtering techniques are commonly adopted to separate the different components. To overcoming the shortcomings of traditional filtering method, a new separation method is proposed with the correlation analysis of sub-bands in nonsubsampled contourlet transform (NSCT) domain. The 3D engineering surface topography is decomposed into different sub-bands by NSCT, and the correlation coefficients of NSCT sub-bands with its parent and children sub-bands are calculated by Pearson correlation method. Then the roughness, waviness and form of 3D real surface topography are restructured respectively by the inverse NSCT based on the NSCT sub-bands which belong to different components. Finally, a group of 3D engineering surfaces are separated into different components, and the result shown that the proposed method can separate 3D engineering surface effectively.

scholarly journals Provider–patient communication and hospital ratings: perceived gaps and forward thinking about the effects of COVID-19

2020 ◽  
Author(s):  
Alan T Belasen ◽  
Jane Oppenlander ◽  
Ariel R Belasen ◽  
Attila J Hertelendy
Keyword(s):  
Correlation Analysis ◽  
Psychiatric Patients ◽  
Pearson Correlation ◽  
Descriptive Analysis ◽  
Healthcare Providers ◽  
Correlation Coefficients ◽  
Composite Measures ◽  
The Usa ◽  
Willingness To Recommend ◽  
Operational Issues

Abstract Objectives To highlight clinical and operational issues, identify factors that shape patient responses in Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS) and test the correlations between composite measures and overall hospital ratings. Design Responses to HCAHPS surveys were used in a partial correlation analysis to ascertain those HCAHPS composite measures that most relate to overall hospital ratings. The linear mean scores for the composite measures and individual and global items were analyzed with descriptive analysis and correlation analysis via JMP and SPSS statistical software. Setting HCAHPS is a patient satisfaction survey required by the Centers for Medicare and Medicaid Services for hospitals in the USA. The survey is for adult inpatients, excluding psychiatric patients. Participants 3382 US hospitals. Intervention None. Main Outcome Measure Pearson correlation coefficients for the six composite measures and overall hospital rating. Results The partial correlations for overall hospital rating and three composite measures are positive and moderately strong for care transition (0.445) and nurse communication (0.369) and weak for doctor communication (0.066). Conclusions From a health policy standpoint, it is imperative that hospital administrators stress open and clear communication between providers and patients to avoid problems ranging from misdiagnosis to incorrect treatment. Additional research is needed to determine how the coronavirus of 2019 pandemic influences patients’ perceptions of quality and willingness to recommend hospitals at a time when nurses and physicians show symptoms of burnout due to heavy workloads and inadequate personal protective equipment.

scholarly journals Validity and reproducibility of a semi-quantitative multiple-choice food frequency questionnaire in adults living in central Iran

2020 ◽  
Author(s):  
Alireza Zimorovat ◽  
Fatemeh Moghtaderi ◽  
Mojgan Amiri ◽  
Hamidreza Raeisi-Dehkordi ◽  
Matin Mohyadini ◽  
...  
Keyword(s):  
Vitamin A ◽  
Vitamin C ◽  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Multiple Choice ◽  
Correlation Coefficients ◽  
Central Iran ◽  
Food Frequency ◽  
Calcium Magnesium

Abstract Background: To the best of our knowledge, no study has tried to develop and validate a multiple-choice food-based FFQ in Iran using weighed dietary records.This study aimed to investigate the validity and reproducibility of a multiple-choice semi-quantitative food frequency questionnaire (SQ-FFQ) in adults living in central Iran.Methods: Participants attended a large long-term clinical trial were asked to complete three SQ-FFQs by interview, and nine 3-day weighed dietary records (WDRs), over nine months. They provided two blood samples to assess serum calcium, magnesium, zinc, and vitamin C levels. The Pearson and intraclass correlation coefficients (ICC) were calculated to assess reproducibility and validity. The degree of misclassification was explored by using a contingency table of quartiles which is compare the information between third FFQ and WDRs. The method of triads was incorporated to assess validity coefficients between estimated intakes using third FFQ, WDRs, and biochemical markers and assumed true intakes.Results: A total of 180 adults aged 48.9±8.4 years completed the study. Compared to WDRs, FFQs overestimated all nutrients intakes except for iron. The median Pearson correlation coefficient was 0.31, 0.44, and 0.38 for FFQ1-FFQ2, FFQ1-FFQ3 and FFQ2-FFQ3, respectively and ICC ranged from 0.43 (thiamin) to 0.73 (vitamin D, median: 0.56). The de-attenuated, age, sex, and education adjusted correlation coefficients ranged from 0.01 for vitamin A to 0.40 for vitamin B12 and -0.05 for vitamin A to 0.41 for manganese (median: 0.17 and 0.26) for FFQ1-WDR and FFQ3-WDR, respectively. The median exact agreement and complete disagreement between FFQ3 and WDRs were 33% and 6%, respectively. The FFQ3 validity coefficients for vitamin C, calcium, magnesium, and zinc were 0.13, 0.62, 0.89, and 0.66, respectively, using the triads method.Conclusions: The SQ-FFQ seems to be an acceptable tool to assess the long-term dietary intake for future large-scale studies in this population.

scholarly journals Surveillance of COVID-19 vaccination in US nursing homes, December 2020-April 2021

2021 ◽  
Author(s):  
Andrew I Geller ◽  
Daniel S Budnitz ◽  
Heather Dubendris ◽  
Radhika Gharpure ◽  
Minn Minn Soe ◽  
...  
Keyword(s):  
Vaccination Coverage ◽  
Long Term Care ◽  
Pearson Correlation ◽  
Vaccine Dose ◽  
Correlation Coefficients ◽  
Care Program ◽  
High Coverage ◽  
Term Care ◽  
National Healthcare Safety Network

Monitoring COVID-19 vaccination coverage among nursing home (NH) residents and staff is important to ensure high coverage and guide patient-safety policies. With the termination of the federal Pharmacy Partnership for Long-Term Care Program, another source of facility-based vaccination data is needed. We compared numbers of COVID-19 vaccinations administered to NH residents and staff reported by pharmacies participating in the temporary federal Pharmacy Partnership for Long-Term Care Program with those reported by NHs participating in new COVID-19 vaccination modules of CDC's National Healthcare Safety Network (NHSN). Pearson correlation coefficients comparing the number vaccinated between the two approaches were 0.89, 0.96, and 0.97 for residents and 0.74, 0.90, and 0.90 for staff, in the weeks ending January 3, 10, and 17, respectively. Based on subsequent NHSN reporting, vaccination coverage with ≥1 vaccine dose reached 77% for residents and 50% for staff the week ending January 31 and plateaued through April 2021.

scholarly journals Transcutaneous Intraluminal Impedance Measurement for Minimally Invasive Monitoring of Gastric Motility: Validation in Acute Canine Models

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Michael D. Poscente ◽  
Gang Wang ◽  
Dobromir Filip ◽  
Polya Ninova ◽  
Gregory Muench ◽  
...  
Keyword(s):  
Gastric Motility ◽  
Animal Studies ◽  
Pearson Correlation ◽  
Impedance Measurement ◽  
Correlation Coefficients ◽  
Force Transducers ◽  
Intraluminal Impedance ◽  
Canine Models ◽  
Gastric Contractions

Transcutaneous intraluminal impedance measurement (TIIM) is a new method to cutaneously measure gastric contractions by assessing the attenuation dynamics of a small oscillating voltage emitted by a battery-powered ingestible capsule retained in the stomach. In the present study, we investigated whether TIIM can reliably assess gastric motility in acute canine models.Methods. Eight mongrel dogs were randomly divided into 2 groups: half received an active TIIM pill and half received an identically sized sham capsule. After 24-hour fasting and transoral administration of the pill (active or sham), two force transducers (FT) were sutured onto the antral serosa at laparotomy. After closure, three standard cutaneous electrodes were placed on the abdomen, registering the transluminally emitted voltage. Thirty-minute baseline recordings were followed by pharmacological induction of gastric contractions using neostigmine IV and another 30-minute recording. Normalized one-minute baseline and post-neostigmine gastric motility indices (GMIs) were calculated and Pearson correlation coefficients (PCCs) between cutaneous and FT GMIs were obtained. Statistically significant GMI PCCs were seen in both baseline and post-neostigmine states. There were no significant GMI PCCs in the sham capsule test. Further chronic animal studies of this novel long-term gastric motility measurement technique are needed before testing it on humans.

Performance Evaluation of an Innovative High-Friction Surface Treatment

2019 ◽  
Vol 2673 (3) ◽  
pp. 485-493
Author(s):  
Xiaoyu W. Chen ◽  
Michele A. Lanotte ◽  
M. Emin Kutay ◽  
Larry Galehouse
Keyword(s):  
United States ◽  
Surface Treatment ◽  
Friction Surface ◽  
Low Cost ◽  
Surface Characteristics ◽  
Cost Effective ◽  
The United States ◽  
Skid Resistance ◽  
The Road ◽  
On The Road

High-friction surface treatment (HFST) is effective for improving pavement surface characteristics and enhancing drivers’ safety on the road. However, common HFST applications are not cost-effective and provide only limited preservation benefits to the existing pavement structure. In this study, the performance of a new HFST, consisting of corundum sand and waterborne epoxy, has been evaluated through laboratory testing. A battery of laboratory tests was performed to compare this new HFST against three common HFST applications used in the United States. Three aspects of the performance were investigated: (i) improvement of skid resistance, (ii) durability to environmental effects (moisture damage and freeze–thaw cycles), and (iii) the effect on an existing crack through semi-circular bending tests. The results showed that the application of the low-cost HFST provides an improvement of skid resistance as good as or better than the traditional HFST applications. Furthermore, since the aggregates used in this technique are much finer than the traditional HFST applications, the treatment looks more like a slurry, and it has the potential to fill the existing cracks with a width of 1.5 ± 0.1 mm and retard further propagation of the cracks. Results revealed that this new HFST technology (developed by a Chinese manufacturer) has the potential to lower the cost compared with materials and practices currently used in the United States.

Can chlorophyll fluorescence be used to determine the optimal time to harvest rice seeds for long-term genebank storage?

2015 ◽  
Vol 25 (3) ◽  
pp. 321-334 ◽  
Author(s):  
Fiona R. Hay ◽  
Stephen Timple ◽  
Bert van Duijn
Keyword(s):  
Chlorophyll Fluorescence ◽  
Correlation Analysis ◽  
Genetic Resources ◽  
Correlation Coefficient ◽  
Correlation Coefficients ◽  
Strong Relationship ◽  
Optimal Time ◽  
Rice Seed ◽  
Potential Tool

AbstractChlorophyll fluorescence (CF) analysis was explored as a potential tool to identify the optimal time to harvest rice seed germplasm for maximum storage longevity. Seeds of 20 diverse genebank accessions were harvested at 24, 31, 38 and 45 d after peak flowering (DAF) and half of each seed lot was sorted by hand, following normal practice at the T.T. Chang Genetic Resources Center. CF analysis was carried out on both non-sorted and sorted seeds, while storage experiments were carried out on sorted seeds. Seed longevity (the time for viability to fall to 50%, p50) was significantly correlated with the skewness, kurtosis, mode and mean of the CF histograms when the data for every accession at all the harvest times were included in the correlation analysis. However, these correlation coefficients were ≤ 0.481. The correlation coefficient between p50 and DAF was similarly low (0.461). For individual accessions, there was wide variation in the correlation coefficients. While for some accessions, there appeared to be a strong relationship between p50 and mean CF that could be used to guide when to harvest seeds in the field, for other accessions, a unique mean CF to inform when to harvest seeds or for use in seed sorting could not be identified; this was also true for DAF over the harvesting schedule used in this study. Given the number and diversity of accessions managed by a genebank, it seems unlikely that CF analysis would be an appropriate tool to help manage the regeneration or processing of seeds intended for storage in the genebank.

scholarly journals Validity and Reproducibility of a Semi-quantitative Multiple-choice Food Frequency Questionnaire in Adults Living in Central Iran

2020 ◽  
Author(s):  
Alireza Zimorovat ◽  
Fatemeh Moghtaderi ◽  
Mojgan Amiri ◽  
Hamidreza Raeisi-Dehkordi ◽  
Matin Mohyadini ◽  
...  
Keyword(s):  
Vitamin A ◽  
Vitamin C ◽  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Multiple Choice ◽  
Correlation Coefficients ◽  
Central Iran ◽  
Food Frequency ◽  
Calcium Magnesium

Abstract Background: To the best of our knowledge, no study has tried to develop and validate a multiple-choice food-based FFQ in Iran using weighed dietary records.This study aimed to investigate the validity and reproducibility of a multiple-choice semi-quantitative food frequency questionnaire (SQ-FFQ)in adults living in central Iran.Methods: Participants attended a large long-term clinical trial were asked to complete three SQ-FFQs by interview, and nine 3-day weighed dietary records (WDRs), over nine months.They provided two blood samples to assess serum calcium, magnesium, zinc, and vitamin C levels.The Pearson and intraclass correlation coefficients (ICC) were calculated to assess reproducibility and validity. The degree of misclassification was explored by using a contingency table of quartiles which is compare the information between third FFQ and WDRs. The method of triads was incorporated to assess validity coefficients between estimated intakes using third FFQ, WDRs, and biochemical markers and assumed true intakes.Results: A total of180 adults aged 48.9±8.4 years completed the study. Compared to WDRs, FFQs overestimated all nutrients intakes except for iron. The median Pearson correlation coefficient was 0.31, 0.44, and 0.38 for FFQ1-FFQ2, FFQ1-FFQ3 and FFQ2-FFQ3, respectively andICC ranged from 0.43 (thiamin) to 0.73 (vitamin D, median: 0.56). The de-attenuated, age, sex, and education adjusted correlation coefficients ranged from 0.01 for vitamin A to 0.40 for vitamin B12 and -0.05 for vitamin A to 0.41 for manganese (median: 0.17 and 0.26) for FFQ1-WDR and FFQ3-WDR, respectively.The medianexact agreement and complete disagreement between FFQ3 and WDRs were 33% and 6%, respectively.The FFQ3validity coefficientsfor vitamin C, calcium, magnesium, and zinc were 0.13, 0.62, 0.89, and 0.66, respectively, using the triads method.Conclusions: The SQ-FFQseems to be an acceptable tool to assess the long-term dietary intake for future large-scale studies in this population.

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