Strong Molecular Traffic Control Effect in TNU-9 Zeolite Channel Topology

2011 ◽  
Vol 115 (51) ◽  
pp. 15289-15294 ◽  
Author(s):  
Sakuntala Chatterjee ◽  
Ramanna Harish ◽  
Gunter M. Schütz
Keyword(s):  
Traffic Control ◽  
Control Effect ◽  
Zeolite Channel

scholarly journals Split allocation model of intersection group oriented to network carrying capacity limit

2020 ◽  
Vol 308 ◽  
pp. 05004
Author(s):  
Jianwei Hu ◽  
Ren Zhang ◽  
Ya Li
Keyword(s):  
Carrying Capacity ◽  
Traffic Control ◽  
Traffic Congestion ◽  
Comprehensive Evaluation ◽  
Total Output ◽  
Traffic Signal Control ◽  
Control Effect ◽  
Allocation Model ◽  
Effective Prevention ◽  
Capacity Limit

In view of the network carrying capacity limit under over-saturated condition, a split allocation model of intersection group was developed, which takes total network delay, total output and total queue length as a comprehensive evaluation index. Based on the analysis of the influence of traffic flow turning, road section capacity, signal cycle length and split on traffic control, under the condition of network carrying capacity limit, the global optimization of intersection group splits was realized, taking the network traffic operation state as the basic judgment criterion and the corresponding constraint conditions were constructed. The numerical example analysis and simulation results show that the proposed model can ensure the traffic signal control effect under the premise of different demand states and control objectives, so that the effective prevention and quick dredging of traffic congestion can be realized under the condition of the network carrying capacity limit.

scholarly journals Research on Key Technology of Signal Control Subarea Partition Based on Correlation Degree Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Huihui Lan ◽  
Xianyu Wu
Keyword(s):  
Traffic Control ◽  
Coordinated Control ◽  
Optimization Method ◽  
Analysis Method ◽  
Control Effect ◽  
Average Delay ◽  
Traffic Efficiency ◽  
Correlation Degree ◽  
Correlation Analysis Method ◽  
Division Model

In order to accurately divide the traffic control subarea and improve the regional coordination control effect, this paper studies the key technologies of traffic control subarea division from the influence of the discrete characteristics of the fleet on the coordinated control. Correlation analysis method and regression analysis method are used to construct the correlation model of adjacent intersections. The principle and process of transportation subarea division are designed by using analytic hierarchy process, and a new traffic subarea division model is proposed. Taking Gulou Street in Miyun District of Beijing as an example, combined with the green wave coordination optimization method, the new model was applied and simulated in SimTraffic. The simulation results show that the average delay of the intersection is reduced by 21.4%, the total number of stops is reduced by 9.62%, and the travel time is shortened by 8.75%. The new intersection degree model and the coordinated control scheme obtained by the traffic subarea division model make the highest traffic efficiency. That is, to verify the scientific research method of this paper, the research results are reliable and the practical application value is high.

scholarly journals Practice of Public Health Interventions Collaboration and Integrated in Macau SAR and Zhuhai to Response to Pandemic of COVID-19

2021 ◽  
Author(s):  
Xiling Yin ◽  
Songjian Xiao ◽  
Xuebao Zhang ◽  
Long Chen ◽  
Xihe Ni ◽  
...  
Keyword(s):  
Traffic Control ◽  
Prevention And Control ◽  
Mainland China ◽  
Control Measures ◽  
Control Effect ◽  
Bay Area ◽  
Policies And Measures ◽  
Two Cities ◽  
Imported Cases ◽  
And Control

Abstract BackgroundIn 2020, the Guangdong-Hong Kong-Macau Greater Bay Area (GBA) was in proximity to the second epicenter of COVID-19 in China, where Macau and Zhuhai are located. Both cities communicated, cooperated, and coordinated under different backgrounds to play a "cocity" effect in response to the COVID-19 pandemic.ResultsIn 2020, Macau and Zhuhai had a total of 46 and 112 confirmed cases of COVID-19, respectively. Ten and 98 confirmed cases in two cities that were imported from mainland China or were the result of local infection caused by imported cases of patients who recovered and were discharged during the first period (January 1 to March 14), respectively. During the second period (March 15 to December 31), both of the cities mainly disposed of imported cases (36 and 14 cases in Macau and Zhuhai) from abroad. In the third period (July 15 to December 31), the two cities gradually returned to normal work and life and economic recovery. Under dynamically adjusted prevention and control measures, the two cities have adopted a series of border control measures based on domestic and abroad changes in the COVID-19 epidemic situation. They had closely cooperated and shared information in terms of epidemic information docking, traffic control, patient care, and material guarantees. The prevention and control policies and measures are basically the same in the two cities and different in the 3 time periods. Health QR code exchange was the basis of mobility of residents between the two cities.ConclusionsBoth cities had zero tolerance for COVID-19 cases and adopted a suppression strategy to accurately grasp the changing epidemic situation at any time. There was no community transmission of local cases, and the control effect with resumption of work and personnel turnover was very obvious in the two cities. These characteristics provide a suitable example for other countries and cities to better understand the effectiveness of control measures to address the possible long-term existence of COVID-19.

Workload Perception of Air Traffic Control Officers and Pilots During Continuous Descent Operations Approach Procedures

2019 ◽  
Vol 9 (1) ◽  
pp. 2-11
Author(s):  
Marina Efthymiou ◽  
Frank Fichert ◽  
Olaf Lantzsch
Keyword(s):  
Fuel Consumption ◽  
Traffic Control ◽  
Air Traffic Control ◽  
Negative Impact ◽  
Air Traffic ◽  
Reduce Fuel Consumption ◽  
Total Load ◽  
Open Path

Abstract. The paper examines the workload perceived by air traffic control officers (ATCOs) and pilots during continuous descent operations (CDOs), applying closed- and open-path procedures. CDOs reduce fuel consumption and noise emissions. Therefore, they are supported by airports as well as airlines. However, their use often depends on pilots asking for CDOs and controllers giving approval and directions. An adapted NASA Total Load Index (TLX) was used to measure the workload perception of ATCOs and pilots when applying CDOs at selected European airports. The main finding is that ATCOs’ workload increased when giving both closed- and open-path CDOs, which may have a negative impact on their willingness to apply CDOs. The main problem reported by pilots was insufficient distance-to-go information provided by ATCOs. The workload change is important when considering the use of CDOs.

How to Evaluate Remote Tower Metrics in Connection With Weather Observations

2018 ◽  
Vol 8 (2) ◽  
pp. 100-111 ◽  
Author(s):  
Maik Friedrich ◽  
Christoph Möhlenbrink
Keyword(s):  
Traffic Control ◽  
Air Traffic Control ◽  
Influential Factors ◽  
Air Traffic ◽  
Weather Event ◽  
Evaluation Of Performance ◽  
Weather Events ◽  
Weather Observations ◽  
Validation Experiment ◽  
Remote Controller

Abstract. Owing to the different approaches for remote tower operation, a standardized set of indicators is needed to evaluate the technical implementations at a task performance level. One of the most influential factors for air traffic control is weather. This article describes the influence of weather metrics on remote tower operations and how to validate them against each other. Weather metrics are essential to the evaluation of different remote controller working positions. Therefore, weather metrics were identified as part of a validation at the Erfurt-Weimar Airport. Air traffic control officers observed weather events at the tower control working position and the remote control working position. The eight participating air traffic control officers answered time-synchronized questionnaires at both workplaces. The questionnaires addressed operationally relevant weather events in the aerodrome. The validation experiment targeted the air traffic control officer’s ability to categorize and judge the same weather event at different workplaces. The results show the potential of standardized indicators for the evaluation of performance and the importance of weather metrics in relation to other evaluation metrics.

Sign in / Sign up

Export Citation Format

Share Document