scholarly journals Pavement Temperature Prediction Model for Oman Climate Condition

2017 ◽  
Author(s):  
Amani Al-Kalbani ◽  
Siham G. Farag
Keyword(s):  
Air Temperature ◽  
Asphalt Pavement ◽  
Paper Study ◽  
Climate Condition ◽  
Temperature Prediction ◽  
Development Models ◽  
System Temperature ◽  
Standard Models ◽  
Pavement Temperature ◽  
The Relationship

Asphalt pavement is form an integral part of any transportation system. Temperature is the significant factor that effect on the performance and life span of a pavement. This paper study the relationship between the air temperature and asphalt pavement temperature and using Excel in order to predicate surface asphalt pavement model for Muscat climate. The models were compared with the standard models SHRP and LTPP models [3]. The development models resulted the surface pavement temperature was taken more time in heating cycle than air temperature. When compared the air temperature and surface asphalt pavement temperature with the standards models SHRP and LTPP models. There was difference between them due to the standards models was design for low temperature under zero where in Muscat temperature cannot be under zero [2].

scholarly journals Research of Deicing and Melting Snow on Airport Asphalt Pavement by Carbon Fiber Heating Wire

2020 ◽  
Vol 2020 ◽  
pp. 1-6 ◽  
Author(s):  
Xin Su ◽  
Yong Lai ◽  
Yan Liu ◽  
Daoxun Ma ◽  
Peng Wang
Keyword(s):  
Carbon Fiber ◽  
Air Temperature ◽  
Asphalt Pavement ◽  
Electrical Power ◽  
Area Ratio ◽  
Melting Snow ◽  
Cold Zone ◽  
Heating Wire ◽  
Pavement Temperature ◽  
Free Area

In the paper, the method of deicing and melting snow by the carbon fiber heating wire (CFHW) embedded in the airport asphalt pavement is proposed to improve the security of airport operation. The field experiment of deicing and melting snow on the airport asphalt pavement is conducted. Deicing and melting snow, asphalt pavement temperature, ice-free area ratio, and snow-free area ratio are analyzed. Electrical power with 350 W/m2 is input to the airport asphalt pavement for deicing and melting snow by the CFHW. In the experiment, 3 mm ice can be melted, and the average infrared ray temperature (IRT) of the airport asphalt pavement surface can achieve an increment of 13.0°C in 2.5 hours when the air temperature is from −7.5°C to −2.2°C. Snow with 3.2 mm precipitation can be melted in 2 hours when the air temperature is from −4.8°C to −3.5°C, and the asphalt pavement temperature can achieve an increment of 5.9°C at the depth of 0.5 cm. The results show that the method of deicing and melting snow on the airport asphalt pavement by the CFHW is practicable in the cold zone.

Asphalt Pavement Temperature Profile for Tropical Climate in Indonesia

2015 ◽  
Vol 776 ◽  
pp. 17-23 ◽  
Author(s):  
I. Made Agus Ariawan ◽  
B.S. Subagio ◽  
B.H. Setiadji
Keyword(s):  
Air Temperature ◽  
Climatic Factors ◽  
Asphalt Pavement ◽  
Data Logger ◽  
Distribution Profile ◽  
Testing Method ◽  
Tropical Area ◽  
Temperature And Humidity ◽  
Pavement Temperature ◽  
Pavement Layers

Environmental and climatic factors directly affect the temperature of asphalt pavement layers. Air temperature is one of the most important environmental factors that significantly affect the temperature distribution profile of asphalt pavement layers. It is important therefore, to comprehend the asphalt strength characteristics because of the differences in asphalt pavement designs. This study was conducted in ​​tropical area with high humidity in Indonesia. A testing method was carried out to measure both temperature and humidity using thermocouples equipped with data logger and an application program of SAGA Technology. Measurements were taken for consecutive seven sunny days in July 2014. The average values obtained ​​for hourly air temperature and humidity were ranging from 24.92 to 36.98 °C and from 50.31 to 83.69% respectively. Meanwhile, pavement surface temperatures measured at 0, 20 and 65 millimeters depths were varied from 25.29 to 45.65 °C, from 25.37 to 43.59 °C, and from 26.70 to 38.54 °C respectively. Both air and asphalt pavement temperatures are sharply increased from 10:00 a.m. to 02:00 p.m. and are gradually decreased afterward.

Study on Temperature Prediction Model of Asphalt Concrete Pavement

2011 ◽  
Vol 243-249 ◽  
pp. 506-509
Author(s):  
Yuan Xun Zheng ◽  
Ying Chun Cai ◽  
Ya Min Zhang
Keyword(s):  
Asphalt Concrete ◽  
Prediction Models ◽  
Asphalt Pavement ◽  
Temperature Data ◽  
Measured Temperature ◽  
Temperature Prediction ◽  
Distribution Laws ◽  
Pavement Temperature ◽  
Asphalt Concrete Pavement ◽  
Excellent Accuracy

This study presents a kind of new model correlates air and pavement temperatures in bituminous pavement. Based on abundant measured temperature data in Henan Province, China, distribution laws in asphalt conctete pavement temperature is studied detailed and the dependency between air and pavement temperature is discussed by the method of regression analysis and the prediction models of asphalt pavement temperature are established. Comparisons between measured and predicted asphalt pavement temperatures indicate that the models are equipped with comprehensive applicability and excellent accuracy.

Temperature Field Division at Liupanshan Area of Ningxia for Asphalt Pavement Performance

2012 ◽  
Vol 511 ◽  
pp. 12-15 ◽  
Author(s):  
Zhuo Hong Cong ◽  
Nan Xiang Zheng ◽  
Yan Jin
Keyword(s):  
Temperature Field ◽  
Air Temperature ◽  
High Field ◽  
Asphalt Pavement ◽  
Pavement Performance ◽  
Statistics Analysis ◽  
Field Temperature ◽  
Pavement Temperature

In order to choose asphalt reasonably, the asphalt pavement performance zone at Liupanshan area of Ningxia was studied according to 30 years’ climate datum. According to the statistics analysis of 30 years’ air temperature and field temperature in the hottest and coldest month, it was suggested that: the high design pavement temperature should be determined according to the average high field temperature in seven consecutive days with 98% reliability, the low design pavement temperature should be determined according to the lowest field temperature of a year with 98% reliability. This method was applied at Liupanshan area to decide the asphalt pavement’s temperature field, which was in accordance with Liupanshan area’s conditions

scholarly journals Development of a Hybrid Machine Learning Model for Asphalt Pavement Temperature Prediction

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Abdalrhman Milad ◽  
Ibrahim Adwan ◽  
Sayf A. Majeed ◽  
Zubair Ahmed Memon ◽  
Munder Bilema ◽  
...  
Keyword(s):  
Machine Learning ◽  
Asphalt Pavement ◽  
Learning Model ◽  
Temperature Prediction ◽  
Machine Learning Model ◽  
Pavement Temperature ◽  
Hybrid Machine

On the Relationship between Alonso's Theory of Movement and Wilson's Family of Spatial-Interaction Models

1981 ◽  
Vol 13 (2) ◽  
pp. 217-224 ◽  
Author(s):  
J Ledent
Keyword(s):  
Input Data ◽  
Spatial Interaction ◽  
System Of Equations ◽  
Interaction Models ◽  
Spatial Interaction Models ◽  
Standard Family ◽  
Original Contribution ◽  
Standard Models ◽  
The Relationship

This paper compares the system of equations underlying Alonso's theory of movement with that of Wilson's standard family of spatial-interaction models. It is shown that the Alonso model is equivalent to one of Wilson's four standard models depending on the assumption at the outset about which of the total outflows and/or inflows are known. This result turns out to supersede earlier findings—inconsistent only in appearance—which were derived independently by Wilson and Ledent. In addition to this, an original contribution of this paper—obtained as a byproduct of the process leading to the aforementioned result—is to provide an exact methodology permitting one to solve the Alonso model for each possible choice of the input data.

scholarly journals Impact of air temperature and drug concentration on liquid emission from elastomeric pumps

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Tomoya Abe ◽  
Kazumasa Matsuzaka ◽  
Toshiaki Nakayama ◽  
Masanobu Otsuka ◽  
Atsunobu Sagara ◽  
...  
Keyword(s):  
Air Temperature ◽  
Anticancer Agents ◽  
Saline Solution ◽  
Emission Rate ◽  
Glucose Solution ◽  
Sufficient Information ◽  
Electronic Control ◽  
Rate Relationship ◽  
The Relationship ◽  
Total Fluid

Abstract Background Elastomeric pumps (EPs) are devices that allow quantitative and continuous drug administration without the need for electronic control, and they are used by being filled with anticancer agents. Although the package inserts of several manufacturers that provide EPs describe the relationship between the flow rate per unit time and temperature, the solution is only saline solution or 5% glucose solution, and data on anticancer drugs have not been published. In this study, we focused on 5-fluorouracil (5-FU), a drug frequently used in cancer chemotherapy, and examined the effect of changes in standard of EPs and temperature on drug emission. Methods We evaluated the EP data of patients treated with Baxter Infusor® LV5 and SV2.5 in terms of emission rate, relationship between 5-FU prescription amount and emission rate, and relationship between emission rate and monthly air temperature in LV5 and SV2.5. The number of EPs sampled in the study was N = 5708 (n = 2988 for LV5 and n = 2720 for SV2.5). Results In LV5, the emission rate varied from 88 to 97% (median 94.0%), whereas in SV2.5, the emission rate was observed as 97 to 98% (median 97.4%). The 5-FU prescription amount and the emission rate were not correlated in LV5 and SV2.5, respectively (LV5; y = − 0.0015x + 97.305, R2 = 0.0226, SV2.5; y = − 0.001x + 100.25, R2 = 0.0466). LV5 showed a higher emission rate in the months with higher air temperature and a lower emission rate in the month with lower air temperature. In addition, LV5 showed a significant reduction in emission rate compared with SV2.5 in all months (P < 0.001). Conclusions In this study, we clarified that air temperature is an important factor that affects the drug emission of EPs. Therefore, it is necessary to examine the conditions for total fluid volume suitable for the air temperature in each region and to provide sufficient information to patients.

Effect of Aging on Urban Asphalt Pavement

2013 ◽  
Vol 671-674 ◽  
pp. 1287-1290
Author(s):  
Ning Li Li ◽  
Xin Po Zhao ◽  
Chuang Du ◽  
Cai Li Zhang ◽  
Qing Yi Xiao
Keyword(s):  
Softening Point ◽  
Asphalt Pavement ◽  
Early Years ◽  
Service Period ◽  
Viscosity Increase ◽  
Pavement Temperature ◽  
Years Of Service ◽  
The City

The aging of asphalt pavement gets serious in the course of service due to the large number of vehicles and high pavement temperature. A survey was conducted on urban road’s asphalt pavement in the city of Tianjin. By analyzing the extracted asphalt sample from asphalt pavement built in different years, it shows that asphalt’s softening point and viscosity increase but its penetration and ductility attenuate with the extension of service period. Of which, the ductility changes dramatically with its ductility attenuating fast in the early years of service and the attenuation of ductility tending to slow down later. The vertical difference of aging in different depth of pavement is marked and degree of aging tends to attenuate from the surface to the center.

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