Temperature–density relationship of hot-mix asphalt pavement after completed rolling

2008 ◽  
Vol 35 (12) ◽  
pp. 1468-1475 ◽  
Author(s):  
Awad S. Hanna ◽  
Min-Jae Lee ◽  
Stephen M. Schoenfelder ◽  
Chanyoung Lee
Keyword(s):  
Cold Rolling ◽  
Hot Mix Asphalt ◽  
Asphalt Pavement ◽  
Explanatory Model ◽  
Density Relationship ◽  
Theory Research ◽  
Relationship Of ◽  
The Relationship ◽  
Significant Factors

This study investigates the relationship between the density and temperature of newly placed hot-mix asphalt pavement, and attempts, using both field and laboratory-based data, to validate the theory that as asphalt cools it becomes denser. Hence, if a nuclear gauge is used to measure asphalt density, it should record a higher reading after the asphalt has been allowed to cool overnight than when the asphalt density was first measured just after cold rolling the previous day. This research investigation has found a model that does not reinforce this theory. Research has shown that testing a road for density the morning after paving, as opposed to the same day, does not result in a significant increase in density. In addition, this study found significant factors that impact pavement density, and developed an explanatory model to estimate pavement density.

scholarly journals The physical nature of heterogeneity of the composition of river water

2019 ◽  
Vol 484 (5) ◽  
pp. 605-609
Author(s):  
Yu. D. Chashechkin ◽  
O. M. Rosenthal
Keyword(s):  
Complete System ◽  
Fluid Motion ◽  
Physical Nature ◽  
Spatial And Temporal Variability ◽  
River Waters ◽  
Environmental Processes ◽  
Hydrodynamic Structure ◽  
Relationship Of ◽  
The Relationship ◽  
Significant Factors

Experimental data are presented to show that the spatial and temporal variability of the composition of river waters cannot be explained solely by the influence of sources and effluents of the substances and that there are additional significant factors that support or even initiate the dispersion of the concentration of pollutants here. This variation is reflected in the resources and the economic characteristics of the rivers; so identification of its reason is important. Thus, the hydrodynamic structure of the water flow is studied by analyzing the complete system of equations of fluid motion mechanics. The completed work allowed us to show that the elements of this structure are waves, vortices, and highly gradient layers (ligaments), presumably creating the described dispersion effect. Further investigation of the relationship of the precise hydrodynamic and hydrochemical structures of river waters will contribute to better understanding of the water-environmental processes, ensuring the perfection of water management methods.

scholarly journals A systematic review of investment opportunity set and dividend policy

2021 ◽  
Vol 1 (2) ◽  
pp. 89-98
Author(s):  
Hamad Raza ◽  
Syed Muhammad Ahmad Hassan Gillani ◽  
Muhammad Ishfaq ◽  
Saif ul Nazir
Keyword(s):  
Systematic Review ◽  
Literature Review ◽  
Return On Investment ◽  
Dividend Policy ◽  
Research Work ◽  
Investment Opportunity ◽  
Investment Opportunity Set ◽  
Relationship Of ◽  
The Relationship ◽  
Significant Factors

There are numerous factors that affects corporate dividend policy and investment opportunity set is among one of the significant factors. Investor are interested to make investments in those firms, which provide benefit and prosperity to shareholders and investors. As investors expect return on investment in the form of dividends. The present study aimed to overview the overall literature published on the relationship of investment opportunity set and dividend policy. For this purpose, articles are selected from the literature published on Scopus and Google Scholar databases. The research methodology adopted the stepwise screening procedure of the PRISMA guidelines and final 28 studies are included for the systematic literature review. After critically analyzing the selected studies, the findings suggests that investment opportunity set is a factor that significantly effect dividend policy. Moreover, the result demonstrates that the interest in the topic of investment opportunity set and its influence on dividend policy is growing. Furthermore, the trend of researchers and academicians to publish their research work is more towards journals-based articles rather than conference articles.

scholarly journals Leadership Integrity and Diversity in the Workplace

2017 ◽  
Vol 2 (5) ◽  
pp. 177 ◽  
Author(s):  
Jack T. McCann ◽  
Betsy H. Sparks ◽  
Thomas F. Kohntopp
Keyword(s):  
United States ◽  
The United States ◽  
Workplace Diversity ◽  
Leader Integrity ◽  
Perceived Leadership ◽  
Relationship Of ◽  
The Relationship ◽  
Diversity In The Workplace ◽  
Significant Factors

<p><em>Leadership integrity and diversity are significant factors in the relationship between leader and employee in the workplace. For employees to follow their leaders, they want someone that they can trust. They will not follow those whom they do not trust or who will not or cannot disclose a clear set of values, ethics and standards. This research examined 941 responses from workers in the United States who completed the Perceived Leader Integrity Scale (PLIS) developed by Craig and Gustafson (1998) and the Workplace Diversity Survey by De Meuse and Hostager (1996), along with demographic questions. This research also examined the relationship of perceived leadership integrity and workplace diversity.</em></p>

The Relationship of Flow and Self-Regulated Learning to Active Procrastination

2013 ◽  
Vol 41 (7) ◽  
pp. 1099-1113 ◽  
Author(s):  
Eunkyung Kim ◽  
Eun Hee Seo
Keyword(s):  
Academic Achievement ◽  
Undergraduate Students ◽  
Multiple Regressions ◽  
Self Regulated Learning ◽  
Regulated Learning ◽  
Relationship Of ◽  
The Relationship ◽  
Significant Factors

We examined the relationships between active procrastination, flow, self-regulated learning, and academic achievement in 278 Korean undergraduate students in order to extend the existing research on active procrastination. We used two hierarchical multiple regressions to identify significant predictors of active procrastination and academic achievement. The results showed that flow and self-regulated learning were significant factors in predicting active procrastination. The findings also indicated that although active procrastination had a significant effect on academic achievement, flow and self-regulated learning better explained academic achievement than did active procrastination. Our findings offered a more in depth understanding of active procrastination than has been achieved in previous research and explained why active procrastinators can obtain satisfactory results.

scholarly journals Toward Understanding Cerebral Blood Flow during Cardiopulmonary Bypass

2019 ◽  
Vol 130 (4) ◽  
pp. 609-613 ◽  
Author(s):  
J. G. Reves
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Cardiopulmonary Bypass ◽  
Regional Cerebral Blood Flow ◽  
Coronary Bypass ◽  
Clinical Effects ◽  
Regional Cerebral Blood ◽  
Relationship Of ◽  
The Relationship ◽  
Significant Factors

AbstractFactors and Their Influence on Regional Cerebral Blood Flow during Nonpulsatile Cardiopulmonary Bypass. By Govier AV, Reves JG, McKay RD, Karp RB, Zorn GL, Morawetz RB, Smith LR, Adams M, and Freeman AM. Ann Thorac Surg. 1984; 38:609–13. Reprinted with permission.In this study, we examined the relationship of regional cerebral blood flow (CBF) to mean arterial pressure, systemic blood flow, partial pressure of arterial carbon dioxide (PaCO2), nasopharyngeal temperature, and hemoglobin during hypothermic nonpulsatile cardiopulmonary bypass (CPB). Regional CBF was determined by clearance of xenon 133 in 67 patients undergoing coronary bypass grafting procedures. There was a significant decrease in regional CBF (55% decrease) during CPB, with nasopharyngeal temperature and PaCO2 being the only two significant factors (p &lt; 0.05). In a subgroup of 10 patients, variation of pump flow between 1.0 and 2.0 L/min/m2 did not significantly affect regional CBF. We conclude that cerebral autoregulation is retained during hypothermic CPB. Under the usual conditions of CPB, variations in flow and pressure are not associated with important physiologic or detrimental clinical effects.

Investigating the Relationship of As-Constructed Asphalt Pavement Air Voids to Pavement Performance

2021 ◽  
Author(s):  
Michael Heitzman ◽  
Carolina Rodezno ◽  
Fabricio Leiva ◽  
Fan Gu ◽  
Gary Elkins ◽  
...  
Keyword(s):  
Asphalt Pavement ◽  
Pavement Performance ◽  
Air Voids ◽  
Relationship Of ◽  
The Relationship

scholarly journals Investigation of the Responses of Asphalt Pavement Structure Considering Load - Poisson's Ratio Relation

2012 ◽  
Vol 5 ◽  
pp. 230-237
Author(s):  
Lei Zhang ◽  
Yi Qiu Tan ◽  
Yang Jian Ou ◽  
Xiang Bing Gong
Keyword(s):  
Finite Element ◽  
Poisson’S Ratio ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Poisson's Ratio ◽  
Pavement Structure ◽  
Relationship Of ◽  
The Relationship ◽  
Poisson's Ratios

Abstract. Poisson’s ratio is one of the important parameters that can be used to reflect the deformation characteristics of solid materials. To further understand the mechanical behaviors of materials and improve the accuracy of the finite element simulation results, the Poisson’s ratio must be defined accurately. In this paper, DIC technology is employed to investigate the Poisson’s ratios of asphalt mixtures under the different gradation and different compaction conditions. It is found that the Poisson’s ratios of different asphalt mixture are quite different and the number of compaction had a greater influence on Poisson’s ratio. It also showed that Poisson’s ratio of asphalt mixture was not a constant under the 25°C temperature condition, but varied with load. The experiment data suggested that the curve of the load - Poisson’s ratio could be divided into three sections through the observation of the graph and it also could be used to investigate the properties of asphalt mixtures deformation resistance. General-purpose finite element software is used to simulate the different contact pressure and Poisson’s ratio under dynamic loading condition, in order to find the response of asphalt pavement structure based on the relationship between load and Poisson’s ratio. It was found that the relationship of load - Poisson’s ratio significantly affected the response of asphalt pavement. It meant that the relationship of load - Poisson’s ratio should be considered when designing the asphalt pavement to improve the asphalt pavement service life.

scholarly journals The Causal Relationship of Microfinance and Economic Development: Evidence from Transnational Data

2017 ◽  
Vol 8 (3) ◽  
pp. 162 ◽  
Author(s):  
Kerstin Lopatta ◽  
Magdalena Tchikov
Keyword(s):  
Economic Development ◽  
Performance Indicators ◽  
Poverty Alleviation ◽  
Microfinance Institutions ◽  
Vector Autoregressive ◽  
Development Indicators ◽  
Capital Growth ◽  
Theory Research ◽  
Relationship Of ◽  
The Relationship

The purpose of this study is to investigate the so far underexamined statistical causality of the relationship between microfinance and economic development. For a representative transnational dataset covering the period 1995 - 2012 we instrumentalize pairwise vector autoregressive (VAR) estimation models and the Granger approach. We utilize prevalent microfinance institutions’ (MFI) performance indicators as measures of microfinance as well as relevant economic development indicators that not only measure economic and capital growth but also poverty, income inequality and labor participation. We find bidirectional causal interactions between both MFIs’ social and financial performance and economic development. Based on our results important implications for microfinance theory, research and practice can be derived. Future empirical research should account for the statistical causality between microfinance and economic development. In practice, purposeful and progressive action that considers the directions of causality between microfinance and economic development verified within our study should be taken to promote economic growth and poverty alleviation.

Coupling Pipes Car-Following Model with GM Model

2011 ◽  
Vol 243-249 ◽  
pp. 4392-4401 ◽  
Author(s):  
Ying En Ge ◽  
Na Wu ◽  
Bing Rong Sun
Keyword(s):  
Differential Equation ◽  
Numerical Experiments ◽  
New Model ◽  
Car Following ◽  
Macroscopic Traffic Flow ◽  
Dynamic Case ◽  
Density Relationship ◽  
Car Following Model ◽  
Relationship Of ◽  
The Relationship

This paper proposes coupling the Pipes car-following model with the GM model to formulate a new car-following model that can generate consistent separation distances between the leading and following vehicles. First, an example is given to show that the GM car-following model can lead to different separation distances at the same steady speed. Secondly, a new model is formulated by coupling the Pipes model with the GM model and it is shown that the only meaningful attractor of the new model is one producing consistent separation distances at the same steady speed. Furthermore, the relationship of those macroscopic traffic flow quantities inherent in the new car-following model has also been investigated. In the steady state, the resulting speed-density relationship is exactly the same as one derived from the Pipes model. In the dynamic case, the derived speed-density relationship is a partial differential equation. Numerical experiments are carried out to show that the new car-following model can generate consistent separation distances between the leading and following vehicles.

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