scholarly journals Performance Degradation Analysis of c-Si PV Modules Mounted on a Concrete Slab under Hot-Humid Conditions Using Electroluminescence Scanning Technique for Potential Utilization in Future Solar Roadways

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4047 ◽  
Author(s):  
Firoz Khan ◽  
Jae Hyun Kim
Keyword(s):  
Stress Testing ◽  
Concrete Slab ◽  
Factors Affecting ◽  
The Road ◽  
Scanning Technique ◽  
Testing Chamber ◽  
Pv Modules ◽  
Temperature And Humidity ◽  
On The Road ◽  
Major Factors

The stability of the photovoltaic (PV) modules is critical when deployed in a non-ideal environment. Among the different factors, temperature and humidity are the two major factors affecting PV stability, making them significant causes of its degradation in terms of optoelectric and materials properties. Nowadays, with the increase in PV installation (here, we are only taking account of c-Si-based PV modules) to generate green electricity, effective space utilization is an important issue. Recently, people have been considering deploying PV modules on the road to utilize the space available on highways (roadways). This raises several new issues in the deployment of PV modules. However, issues related to temperature and humidity retain the same importance. Normally, these stability tests are performed in a damp-heat (DH) stress-testing chamber in an accelerated condition at 85 °C and 85% relative humidity (RH). In this work, c-Si PV modules were fixed over a concrete slab to prepare a PV interacted block, which can be used to build concrete-based roads. The performance of this PV on the concrete slab was tested in a DH stress-testing chamber in an accelerated condition at 85 °C and 85% RH for 4000 h. For the comparison, a PV module without concrete was also evaluated. The degradation of the PV modules was characterized using the electroluminescence scanning technique. After 2500 h of exposure to the DH conditions, the performance retention of the PV modules mounted on the concrete was 93.2%, which was nearly 5% higher than the module without the concrete slab.

scholarly journals Assessing Significant Factors Affecting Risky Riding Behaviors of Motorcyclists

2020 ◽  
Vol 10 (18) ◽  
pp. 6608
Author(s):  
Wins Cott Goh ◽  
Lee Vien Leong ◽  
Richard Jun Xian Cheah
Keyword(s):  
Positive Affect ◽  
Latent Variables ◽  
Traffic Accidents ◽  
Negative Relationship ◽  
Positive Outcome ◽  
Factors Affecting ◽  
The Road ◽  
Maximum Variance ◽  
Hypothesis Model ◽  
On The Road

This study was conducted in Malaysia, where motorcycle traffic accidents represent a high percentage of fatality among overall traffic accidents. Studies have shown that risk perception and positive outcome of risky riding behavior have a significant impact on a rider’s decision making. Therefore, this study is targeted at further understanding of Malaysian motorcyclists within the locality of their home country. A questionnaire survey was conducted to gather motorcycle rider’s information, together with their perception of the three factors mentioned above. A reliability test of the findings was analyzed using Cronbach’s Alpha, while a PCA analysis was conducted to determine the linear combinations that have maximum variance. Subsequently, a statistical model was constructed based on the latent variables’ relations, the relation between the latent variables and observed variables, and also the hypothesis model. The model confirms that the positive affect of the risky behavior has a significant positive relationship with motorcyclists’ risk behavior (estimate coefficient = 1.016). Findings in the model also show that older motorcyclists are less likely to take part in risky riding behavior while riding on the road, with an estimate coefficient of −0.037 and a negative relationship with positive affect (estimate coefficient = −0.032).

Effect of Rainfall Intensity and Road Crossfall on Skid Resistance of Asphalt Pavement

2014 ◽  
Vol 70 (4) ◽  
Author(s):  
Haryati Yaacob ◽  
Mohd Rosli Hainin ◽  
Sudesh Nair A/L Baskara
Keyword(s):  
Weather Condition ◽  
Water Film ◽  
Road Accidents ◽  
Factors Affecting ◽  
The Road ◽  
Pendulum Test ◽  
Different Types ◽  
Sand Patch ◽  
Wet Weather ◽  
Major Factors

Skidding is one of the major factors to road accidents during wet weather condition. Skidding during wet weather happens when water film presents between the tyre and pavement reducing the friction of tyre onto the road surface. This laboratory study was carried out to investigate the factors affecting Pendulum Test Value on Asphaltic Concrete surfaces. The main objective of this study is to determine the pavement type and the crossfall percentage that best resist skid during wet weather condition. Three different types of dense graded mixes were used in this study which are AC10, AC14 and AC20. Those three constructed mixes were tested using Sand Patch Test (SPT) and were then subjected to various rainfall conditions and crossfall percentages using Rainfall Simulator. The rainfall conditions are categorized as low rainfall, medium rainfall and high rainfall while the crossfalls were increased 2% from 0% to 10% crossfalls. During the event of rainfall on each pavement surfaces, a British Pendulum Tester (BPT) was used on the pavements to obtain the Pendulum Test Value (PTV) at different crossfalls. Collected data are analyzed using analysis of variance (ANOVA) to justify the objectives. Results from PTV shows that 4% to 10% crossfall is the best crossfall and AC20 is the best surface type in resisting skid.

scholarly journals Analysis factors affecting formation on the clutch durability between asphalt-concrete layers of road clothing

2021 ◽  
pp. 26-31
Author(s):  
Liydmyla Levkivska ◽  
◽  
Jafar Musa Elallak
Keyword(s):  
Asphalt Concrete ◽  
Complex Analysis ◽  
Physical And Mechanical Properties ◽  
Difficult Situation ◽  
Factors Affecting ◽  
Operational Conditions ◽  
The Road ◽  
Number Of Factors ◽  
Literary Sources ◽  
On The Road

This article reflects the importance of the road network for the social development of society and the development of the economy of the country as a whole. On the basis of literary sources provides complex analysis of roads in Ukraine, their current functional state and tendencies of development. It is established that the road industry is in a rather difficult situation due to unsatisfactory transport and operational conditions of the vast majority of Ukrainian roads. Construction of new roads is extremely rare because of lack of financial resources. Road works are usually carried out to preserve the network of already existing roads and to ensure their necessary transport and operational status. According to the results of the analysis, one of the main reasons for the premature destruction of newly constructed or repaired non-rigid pavements is the low strength of interlayer adhesion in the contact area of the newly covered material with the layer below. The effect of clutch durability between asphalt layers on the road strength has been studied in detail. A number of factors that affect the quality of clutch durability between layers are analyzed. It is established that in order to ensure the strength of grafting between asphalt concrete layers of road clothing, it is necessary to strictly observe the technological regimes of their laying, above all temperature; to take into account the physical and mechanical properties of materials at the construction stage and the influence of climatic and mechanical factors, or most often their complex effect on the operation of the highway.

Tyre Characteristics as Applicable to Vehicle Stability Problems

1953 ◽  
Vol 7 (1) ◽  
pp. 113-133 ◽  
Author(s):  
T. J. P. Joy ◽  
D. C. Hartley
Keyword(s):  
High Speed ◽  
The Self ◽  
Vehicle Stability ◽  
Factors Affecting ◽  
Handling Performance ◽  
Transient Behaviour ◽  
The Road ◽  
Drawing Board ◽  
On The Road ◽  
Board Stage

The authors define the characteristics of a pneumatic tyre which affect the handling, or stability, of a car, and briefly describe a machine which was developed to measure these characteristics. The results are given of various experiments showing the effect of several factors on the characteristics; the applicability of these results to the behaviour of a tyre on the road is also discussed. Briefly defining oversteer and understeer, the authors outline a proposed method for directly determining the handling performance of a car while it is still in the drawing board stage. It is pointed out that this will only apply to steady conditions and some of the factors affecting transient behaviour are discussed. In particular, the importance of the self-aligning torque is stressed. The problem of breakaway is mentioned and doubts are cast on the applicability of the machine results to high-speed cornering, or racing; the technique of drifting a car round a corner is discussed. The MS. of this paper was received at the Institution on 17th November 1953, and in its revised form on 11th January 1954. For the report of the meeting in London, at which this paper was presented, see p. 134.

Analysis of Bicycle Commuter Routes Using Geographic Information Systems: Implications for Bicycle Planning

1997 ◽  
Vol 1578 (1) ◽  
pp. 102-110 ◽  
Author(s):  
Lisa Aultman-Hall ◽  
Fred L. Hall ◽  
Brian B. Baetz
Keyword(s):  
Travel Behavior ◽  
Traffic Signals ◽  
Geographic Information ◽  
Factors Affecting ◽  
The Road ◽  
Minimum Path ◽  
Pedestrian Bridges ◽  
Local Roads ◽  
Bicycle Planning ◽  
On The Road

A geographic information system (GIS) network data base is used to determine the characteristics of 397 routes used by commuter cyclists in Guelph, Ontario, Canada, and to compare them with the shortest-path routes between each origin and destination. The analysis of route data provides useful insight for understanding factors affecting travel behavior and in this case provides quantitative support for many existing assumptions regarding commuter cyclist behavior. Most commuters divert very little from their minimum path (0.4 km on average) and are found to use major road routes. The cyclists tend to avoid grades, grade-separated railway crossings, and high-activity areas, but not road (as opposed to pedestrian) bridges. Cyclists use traffic signals especially for crossing major roadways and turning. The high-quality direct off-road paths are used only infrequently by the commuter cyclists and the lower quality ones even less. The results of this analysis suggest that efforts to accommodate current commuter cyclists should be focused on improving cycling conditions on the road network, such as providing wider curb lanes, or actuated traffic signal detectors that recognize the presence of bicycles. If potential new commuters are similar to the minority of current commuter cyclists in this study who use mainly local roads, paths or trails, then projects that make the network of local roads and pathways more connective and direct may encourage a higher level of commuter cycling.

scholarly journals Assessment of Safety Risk for Signalized and Un-signalized Intersection in a Road Network

2020 ◽  
Vol 9 (4) ◽  
pp. 13-17
Keyword(s):  
Motor Vehicles ◽  
Relative Importance ◽  
The Road ◽  
Sustainable Improvement ◽  
Expert Opinions ◽  
Pedestrian Traffic ◽  
On The Road ◽  
Using Data ◽  
Major Factors ◽  
Safety Indices

The spectacular increase of number of motor vehicles on the road is mainly attributed ingeneration of traffic problems like accidents, congestions, delays etc., especially in the urban premises of developing countries. This paper examines the traffic problems and sustainable improvement of road intersection at Bhopal, India. The special and temporal constitutions of the vehicle as well as pedestrian traffic at the intersections were examined and the characteristics of the junction indoctrinating the delay problems are identified. Data regarding the traffic volume, land use and pedestrian movement activities are collected through surveys, expert opinion and literature . Analysis of the collected data revealed that the improper planning of the junctions, lack of traffic signals and unauthorised parking are the major factors contributing to the traffic congestions. Various Using data collected from surveys, traffic frequency and severity standards for signalized and Un signalized have been established. The methodologies are developed incorporating the relative importance of different severity of different safety indices at intersection. The relative importance (weights) of very low, low, medium and high severity condition is developed using data collection and expert opinions experience people which have knowledge in development/safety development at intersection were obtained by conducting a survey.

scholarly journals Pressure gauge accuracy and tire maintenance awareness among vehicle owners in Birnin Kebbi, Nigeria

2020 ◽  
Vol 4 (2) ◽  
pp. 99-107
Author(s):  
Ademola James Adeyemi ◽  
Olusegun Isa Lasisi ◽  
Abubakar Arzika Zaki ◽  
Sani Isa Besse ◽  
Muhammad Bello Ambursa
Keyword(s):  
Online Survey ◽  
Safety Information ◽  
Pressure Gauge ◽  
School Curriculum ◽  
Road Accident ◽  
Northwestern Part ◽  
Factors Affecting ◽  
The Road ◽  
On The Road ◽  
Maintenance Personnel

Aside from human factors, tire blowouts and other tire imperfections are major contributors to the persistently high road accident rate. While tire imperfections are categorized as part of the mechanical factors affecting road accident, the tire maintenance personnel and the vehicle owners' human behavior plays a significant role in ensuring that accidents due to tire imperfections are minimized. Therefore, this study aims to determine the accuracy of the pressure gauges used by tire maintenance personnel, popularly called vulcanizers in Nigeria, and to determine the level of awareness of vehicle owners about the basic information that affects the safe use of tires on the road.  The study consists of two stages. The first stage investigates the accuracy of the pressure gauges used by twenty vulcanizers in four different districts in Birnin Kebbi, the northwestern part of Nigeria. The second stage was an online survey regarding the tire maintenance behavior of 87 participants, who were formally educated from Diploma to Ph.D. level. The study's findings showed that about 25% of the vulcanizers do not use pressure gauges to measure air pressure during tire inflation, and less than 17% of the readings taken were accurate. Yet about 60% of the respondents believe that vulcanizers' pressure gauges are reliable and less than 30% of the respondents know that the expiring date of tires is four years in Nigeria. Therefore, there is an urgent need for proper awareness about tire usage and maintenance among the general population. It would also be appropriate to include such basic road safety information in the school curriculum at all levels.

scholarly journals Structural and Rock Slope Stability Assessment of Some Sites Along Sirwan Road, Sulaimaniyah Governorate, Northeast Iraq

2019 ◽  
pp. 1304-1311
Author(s):  
Omar Gheni Aziz ◽  
Thair Thamer Al-Samarrai ◽  
Salim Hassan Al-Hakari
Keyword(s):  
Slope Stability ◽  
Rock Slope ◽  
Slope Angle ◽  
Point Load ◽  
Load Test ◽  
Rock Slope Stability ◽  
Factors Affecting ◽  
The Road ◽  
Average Value ◽  
On The Road

A structural and engineering geological study of rock slope stability was carried out in six stations that lie in the Southwest of Baranan mountain, along Sirwan road. The rock slopes and discontinuities were surveyed at each of these stations, and the relationships with failures were determined. The slopes were classified on the basis of (Al-Saadi, 1981), and the rocks were described in engineering terms according to (Anon, 1972) and (Hawkins, 1986), Stereographic projection was made using software (GEOrient 9.5.0) to represent the field data that were recorded in order to understand the situation in the six stations (sites) that were chosen along Sirwan road near Darbandikhan dam, the failures' types were recorded during field study were rock fall, toppling, and sliding. The study also revealed that the factors affecting slope stability in the study area were slope angle, height, dip of strata, and discontinuities. The laboratory test of the rock samples (point-load test) showed that the average value of compressive strength of the rock for the study area is about 181.29 MPa.Some measures are proposed to stabilize the slopes in the mentioned stations including; the removal of blocks liable to toppling in the critical cases (sites 2 and 6), casing the slopes with covenant materials such as concrete (site 4) and gabions (sites 2 and 6), with construction of retaining walls and digging of protective trenches to protect the slopes and reduce their hazard on the road (site 1, 3, and 5).

scholarly journals The Application of Data Mining Technology to Build a Forecasting Model for Classification of Road Traffic Accidents

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yau-Ren Shiau ◽  
Ching-Hsing Tsai ◽  
Yung-Hsiang Hung ◽  
Yu-Ting Kuo
Keyword(s):  
Traffic Engineering ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Principal Component ◽  
Recursive Feature Elimination ◽  
Road Traffic Accidents ◽  
Factors Affecting ◽  
The Road ◽  
On The Road ◽  
Central Taiwan

With the ever-increasing number of vehicles on the road, traffic accidents have also increased, resulting in the loss of lives and properties, as well as immeasurable social costs. The environment, time, and region influence the occurrence of traffic accidents. The life and property loss is expected to be reduced by improving traffic engineering, education, and administration of law and advocacy. This study observed 2,471 traffic accidents which occurred in central Taiwan from January to December 2011 and used the Recursive Feature Elimination (RFE) of Feature Selection to screen the important factors affecting traffic accidents. It then established models to analyze traffic accidents with various methods, such as Fuzzy Robust Principal Component Analysis (FRPCA), Backpropagation Neural Network (BPNN), and Logistic Regression (LR). The proposed model aims to probe into the environments of traffic accidents, as well as the relationships between the variables of road designs, rule-violation items, and accident types. The results showed that the accuracy rate of classifiers FRPCA-BPNN (85.89%) and FRPCA-LR (85.14%) combined with FRPCA is higher than that of BPNN (84.37%) and LR (85.06%) by 1.52% and 0.08%, respectively. Moreover, the performance of FRPCA-BPNN and FRPCA-LR combined with FRPCA in classification prediction is better than that of BPNN and LR.

scholarly journals Factors Influencing Fatalities or Severe Injuries to Pedestrians Lying on the Road in Japan: Nationwide Police Database Study

Healthcare ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1433
Author(s):  
Mirae Koh ◽  
Masahito Hitosugi ◽  
Eiko Kagesawa ◽  
Takahiro Narikawa ◽  
Kohei Takashima
Keyword(s):  
Multivariate Logistic Regression Analysis ◽  
Positive Influence ◽  
Collision Velocity ◽  
Severe Injuries ◽  
Vehicle Collisions ◽  
The Road ◽  
Accident Research ◽  
Hit And Run ◽  
On The Road ◽  
Major Factors

To help reduce the number of pedestrians lying on the road suffering fatal or severe injuries as a result of vehicle collisions, we investigated the influencing factors. We conducted an analysis of the records of the Institute for Traffic Accident Research and Data Analysis Japan between 2012 and 2018; we found that 2452 pedestrians lying on the road were involved in collisions (797 fatalities, 784 severely injured, 871 mildly injured). Multivariate logistic regression analysis identified the following as major factors that positively influenced the fatalities: head or neck injuries (odds ratio [OR], 90.221); trunk injuries (OR, 71.040); trucks as offending vehicle (OR, 2.741); collision velocity of 10–20 km/h (OR, 31.794), 20–30 km/h (OR, 2.982), 30–40 km/h (OR, 8.394), 40–50 km/h (OR, 16.831), and >50 km/h (OR, 18.639); and hit-and-run cases (OR, 1.967). The following had a positive influence on severe injuries: trunk injuries (OR, 4.060); collision velocity of 10–20 km/h (OR, 2.540), 20–30 km/h (OR, 3.700), 30–40 km/h (OR, 5.297), 40–50 km/h (OR, 5.719), and ≥50 km/h (OR, 5.244); and hit-and-run cases (OR, 2.628). Decreasing the collision velocity, avoiding collisions to the head and neck or trunk, and preventing hit-and-run cases would be effective in reducing fatal or severe injuries to pedestrians lying on the road.

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