Analytical and simulation models of weaving area operations under non-freeway conditions

The Highway Capacity Manual covers adequately the operation of weaving areas on freeways. Weaving on non-freeway facilities, however, has not been addressed as yet. This research effort presents a state-of-the-art procedural analytical approach and simulation models for the analysis of the level of service and operation of non-freeway weaving areas. Weaving under non-freeway conditions is classified into two broad categories; basic weave and ramp weave. The analytical models for these two weaving categories are calibrated and validated based on data obtained from several sites selected in the states of New Jersey and New York. New level of service criteria are developed for these two weaving categories. A FORTRAN program was developed to compute average weaving and nonweaving speeds and determine the level of service. In addition, simulation is used to develop a model for basic weave only. The simulation model is microscopic, enabling the user to study the dynamics of individual vehicles and the overall traffic flow

Peak to average power ratio based spatial spectrum sensing for cognitive radio systems

The recent convergence of wireless standards for incorporation of spatial dimension in wireless systems has made spatial spectrum sensing based on Peak to Average Power Ratio (PAPR) of the received signal, a promising approach. This added dimension is principally exploited for stream multiplexing, user multiplexing and spatial diversity. Considering such a wireless environment for primary users, we propose an algorithm for spectrum sensing by secondary users which are also equipped with multiple antennas. The proposed spatial spectrum sensing algorithm is based on the PAPR of the spatially received signals. Simulation results show the improved performance once the information regarding spatial diversity of the primary users is incorporated in the proposed algorithm. Moreover, through simulations a better performance is achieved by using different diversity schemes and different parameters like sensing time and scanning interval

Prediction of Rutting in Flexible Pavements using Finite Element Method

In this research study three dimensional (3D) finite element analysis are performed on a flexible pavement section for different material properties, temperature and loading conditions. The main objective of this study is to predict the rut depth under different conditions of temperature, loadings and material properties. Three dimensional finite element model of flexible pavement is developed using ABAQUS to predict rut depth. The pavement system is assumed to be an elastic multi-layers system with each layer being isotropic, homogeneous with specified Resilient Modulus (Mr) and Poisson ratio (µ). With the exception of the bottom subgrade layer, each layer is extending to an unlimited horizontal extent and has a finite thickness. The pavement system analyze in this study for a cyclic load of 10000 cycles taken as 0.01sec per cycle. Standard Axle Load (ESAL) of 18 kips (80 kN) loading on an axle with a dual set of tires, the wheel spacing is 13.78 in (350 mm) with a tire contact pressure of 100 psi (0.69 MPa) is used. After performing a series of analysis the results showed that rut depth increases with increase in temperature and loading and decreases by using base stabilizer. Doi: 10.28991/cej-2021-03091727 Full Text: PD

Investigation Of Drug Nutrient Interactions And Physicochemical Compatibilities Of Ceftazidime, Cefotaxime And Cefepime In Neonatal Total Nutrient Admixtures Using Hplc

and trace elements). The stability of the formulations were evaluated for various physicochemical parameters such as pH, globule size, zeta potential, precipitation, flocculation, coalescence and concentrations of sodium, potassium and drug concentrations. The experiments were carried out at room temperature (25±2°C) and samples were collected at 0, 4, 8, 16 and 24 hours respectively. Antibiotic concentrations in the samples were analyzed by using the newly developed and validated HPLC methods. SPE was used by modification of the mobile phase and washing solvents in different ratios to achieve better accuracy, precision, linearity, earlier retention times, clear elution and recovery. The study showed that ceftazidime and cefepime were stable for up to 16 hours while cefotaxime was stable for up to 24 hours in all TNAs formulations and there after degraded more than 10% respectively. Physico-chemical compatibility results showed that there were no significant changes in pH, globules size, zeta potential and concentrations of sodium and potassium in all of the formulations (all p >0.05). In addition, there was no precipitation or flocculation observed in any of the formulation. The newly developed HPLC methods were able to detect selected cephalosporins more accurately, precisely, effectively and efficiently. In conclusion, this study showed that ceftazidime and cefepime were compatible and stable for 16 hours in/with TNAs while cefotaxime was compatible and stable for 24 hours in/with TNAs

Design and Development of a Multi-Sided Tabletop Augmented Reality 3D Display Coupled with Remote 3D Imaging Module

This paper proposes a tabletop augmented reality (AR) 3D display paired with a remote 3D image capture setup that can provide three-dimensional AR visualization of remote objects or persons in real-time. The front-side view is presented in stereo-3D format, while the left-side and right-side views are visualized in 2D format. Transparent glass surfaces are used to demonstrate the volumetric 3D augmentation of the captured object. The developed AR display prototype mainly consists of four 40 × 30 cm2 LCD panels, 54% partially reflective glass, an in-house developed housing assembly, and a processing unit. The capture setup consists of four 720p cameras to capture the front-side stereo view and both the left- and right-side views. The real-time remote operation is demonstrated by connecting the display and imaging units through the Internet. Various system characteristics, such as range of viewing angle, stereo crosstalk, polarization perseverance, frame rate, and amount of reflected and transmitted light through partially reflective glass, were examined. The demonstrated system provided 35% optical transparency and less than 4% stereo crosstalk within a viewing angle of ±20 degrees. An average frame rate of 7.5 frames per second was achieved when the resolution per view was 240 × 240 pixels

Design and Development of a Multi-Sided Tabletop Augmented Reality 3D Display Coupled with Remote 3D Imaging Module

This paper proposes a tabletop augmented reality (AR) 3D display paired with a remote 3D image capture setup that can provide three-dimensional AR visualization of remote objects or persons in real-time. The front-side view is presented in stereo-3D format, while the left-side and right-side views are visualized in 2D format. Transparent glass surfaces are used to demonstrate the volumetric 3D augmentation of the captured object. The developed AR display prototype mainly consists of four 40 × 30 cm2 LCD panels, 54% partially reflective glass, an in-house developed housing assembly, and a processing unit. The capture setup consists of four 720p cameras to capture the front-side stereo view and both the left- and right-side views. The real-time remote operation is demonstrated by connecting the display and imaging units through the Internet. Various system characteristics, such as range of viewing angle, stereo crosstalk, polarization perseverance, frame rate, and amount of reflected and transmitted light through partially reflective glass, were examined. The demonstrated system provided 35% optical transparency and less than 4% stereo crosstalk within a viewing angle of ±20 degrees. An average frame rate of 7.5 frames per second was achieved when the resolution per view was 240 × 240 pixels

Impact of Money Supply and Exchange Rate on Agricultural Prices in Pakistan

This study analyzed the impact of the long-run neutrality of money supply and exchange rate on Pakistan's agricultural prices using data from 1975 to 2019. Engle and Granger and Johansen and Jusileius techniques were used to analyze the data. The results showed that the exchange rate's neutrality does not hold in the long-run. Simultaneously, the money supply coefficient was found to be insignificant in the long-run, emphasizing money's neutrality. The study concluded that monetary authorities can control the exchange rate by designing and implementing appropriate policies to overcome the overshoot problem of agricultural prices in Pakistan