scholarly journals Lighting Environment Optimization of Highway Tunnel Entrance Based on Simulation Research

2019 ◽  
Vol 16 (12) ◽  
pp. 2195 ◽  
Author(s):  
Yongqiang Zhang ◽  
Xi Zhuo ◽  
Wei Guo ◽  
Xiaoyu Wang ◽  
Zhenglu Zhao
Keyword(s):  
Simulation Software ◽  
Zhejiang Province ◽  
Illumination Intensity ◽  
Simulation Research ◽  
Climate Conditions ◽  
Highway Tunnel ◽  
Surrounding Environment ◽  
Different Seasons ◽  
Lighting Environment ◽  
Tunnel Entrance

At the entrance of a tunnel, reflection of sunlight from the surrounding environment and a lack of adequate lighting usually cause some vision problems. The purpose of this study is to optimize the lighting environment at the entrance of highway tunnels. Firstly, based on a highway tunnel in Zhejiang Province, the natural illumination intensity in different seasons and climate conditions inside and outside the tunnel entrance was analyzed by means of DIALux simulation software. Then the variation in illumination conditions with distance at the entrance of the tunnel was analyzed. Finally, based on the results above, this study proposes four solutions as follows: setting up a shading shed, auxiliary lighting facilities, decelerating reflective markings, and an adaptive dimming system.

Current Status of Anserinae Wintering in Azov-Black Sea Region of Ukraine

2019 ◽  
Vol 53 (4) ◽  
pp. 297-312
Author(s):  
Yu. O. Andryushchenko ◽  
V. S. Gavrilenko ◽  
V. A. Kostiushyn ◽  
V. N. Kucherenko ◽  
A. S. Mezinov ◽  
...  
Keyword(s):  
Black Sea ◽  
Current Status ◽  
Anser Anser ◽  
Scientific Publications ◽  
Climate Conditions ◽  
Black Sea Region ◽  
Chen Caerulescens ◽  
Branta Bernicla ◽  
The North ◽  
Different Seasons

Abstract In the article is analyzed own field data of the authors and scientific publications on the wintering of Anserinae in the Azov-Black Sea region of Ukraine in 1900–2017, but the main data was obtained in frame of international mid-winter counts (IWC) in 2005–2017. It was found that 9 species of Anserinae occur in this region during the different seasons of the year: Anser anser — nesting, wintering and migrating; Rufibrenta ruficollis, A. albifrons, A. erythropus, A. fabalis — migrating and wintering; Branta canadensis, Branta leucopsis, Branta bernicla, Chen caerulescens — vagrant or birds which flew away from captivity (zoo etc.). Eulabeia indica — is possible vagrant species. The most numerous wintering species is A. albifrons, common — Rufibrenta ruficollis, not numerous — Anser anser, the other species are not met annually and registered in a very small number. There was almost tenfold drop in number of wintering geese in the Azov-Black Sea region of Ukraine during the period of counts. The main reasons of such reducing of geese amount are the followwing: weather and climate conditions, changes in the forage acessibility, hunting and poaching pressure, poisoning as a result of deratization of agricultural lands, and from 2014 — the militarization of the Syvash area and stop of water supplying of Crimea through the North Crimean channell. It is likely that the factors mentioned above led to relocating of wintering areas of Anserinae, and resulted in decreasing of their amount in this region.

Statistical Processing and Correlations Between Concentrations of Some Atmospheric Pollutants in Suceava and Botosani Counties

2020 ◽  
Vol 71 (7) ◽  
pp. 175-186
Author(s):  
Doina Lutic ◽  
Danut-Gabriel Cozma
Keyword(s):  
Nitrogen Monoxide ◽  
Statistical Processing ◽  
Geographic Area ◽  
The Other ◽  
Atmospheric Pollutants ◽  
Climate Conditions ◽  
National Network ◽  
Different Seasons ◽  
Official Site ◽  
Social Wealth

The abundance of some pollutants from the air depend on the geographic area, the human activities intensity, the climate, the season and even on the hour within a day. The nitrogen oxides are the most abundant and most dangerous toxic species from the air, and these emissions are tightly connected to human polluting activities. Therefore, in our work, the first part is assigned for a wide literature search concerning the incidence of the keywords �nitrogen oxide� and searching the connections with other significant related terms and formulas, investigated by the researches worldwide. Then, a statistic approach was applied trying to correlate the values of the concentration in air of nitrogen monoxide, nitrogen dioxide, carbon monoxide, sulfur dioxide, benzene and particulate matter PM10, all of these being generated to a large extent from the exhaust gases from different automotives. The data were collected from the official site of the National Network of Air Quality Monitoring from Romania, and processed by statistical methods, using specific software and methods, in order to find significant differences between the pollutants concentrations values in two neighbor counties (Suceava and Botosani), with relatively similar climate conditions, but different social wealth. The findings of these statistical processing indicate that the PM10 values do not present significant differences between the two locations, neither the time within a day, while the other parameters exhibit distinctions between the values of the other pollutants concentrations in different seasons (summer and winter) and hourly intervals within a day (night, morning, afternoon and evening).

Design and simulation research of the double-spin folding mechanism based on a suspended missile

2021 ◽  
pp. 154851292110231
Author(s):  
ZH Yuan ◽  
SY Guo ◽  
SN Zhang ◽  
JQ Zhao ◽  
WJ Lu ◽  
...  
Keyword(s):  
High Reliability ◽  
Lift Coefficient ◽  
Great Influence ◽  
Reference Value ◽  
Aerodynamic Characteristics ◽  
Simulation Software ◽  
Fluid Simulation ◽  
Simulation Research ◽  
Double Spin ◽  
Locking Mechanism

Based on the suspension of a missile using folding rotary wings and airbags, in order to improve the basic parameters and motion characteristics of the rotor during the unfolding process and analyze the aerodynamic characteristics of the entire device in the suspension state, after proposing a scheme of double-spin mechanism, the main folding and unfolding mechanism, initial driving device, rotating driving device, and locking mechanism were designed, and the simulation research is studied by the Automatic Dynamic Analysis of Mechanical System and Ansys Fluent Fluid Simulation software, respectively. The results show that the rotation rate was controlled at 41.8 mm/s, the various motion parameters are reasonable, and the operation process is relatively smooth, with high reliability. The speed and pressure value at the tip of the rotor are higher and the aerodynamic disturbance is obvious, which has a great influence on the aerodynamic performance. The speed and pressure distribution of the surrounding flow field is stable, the lift provided is 46 N, and the lift coefficient is 0.55, which can ensure the long-time suspension state of the missile. This paper puts forward a valuable design idea and has practical reference value for the research of the suspended missile.

scholarly journals Discussion on Landscape and Greening Technology of Highway Structural Tunnel Entrance

2021 ◽  
Vol 261 ◽  
pp. 03035
Author(s):  
Liu Ming ◽  
Liu Zhiqiang ◽  
Qiang Rongrong
Keyword(s):  
Cultural Landscape ◽  
Practical Stability ◽  
Tunnel Engineering ◽  
Portal Area ◽  
Highway Tunnel ◽  
Exposed Part ◽  
Tunnel Portal ◽  
Tunnel Entrance

Highway tunnel entrance is not only the exposed part of mountain in the tunnel engineering, but also an integral part of the highway breaking through the mountain. On the premise of ensuring the safety of tunnel entrance, it is important to realize the unity of safety and practical “stability” and landscape greening “beauty” of the expressway tunnel through reasonable aesthetic landscape greening design. In combination with the topographic and geomorphological conditions as well as the regional and humanistic conditions of the highway tunnel portal area, this paper introduces the cultural landscape and plant greening engineering of highway tunnel entrance by reference to the successful experience of tunnel entrance landscape greening, and puts forward the requirements for landscape and greening technology of highway tunnel entrance in accordance with the provisions of relevant regulations.

scholarly journals The Evaluation of Lighting Environment by Computer Graphics in Highway Tunnel

1997 ◽  
Vol 81 (Appendix) ◽  
pp. 283-283
Author(s):  
Takashi Ono ◽  
Masanori Takeda ◽  
Takashi Endo ◽  
Yoshio Sasaki ◽  
Hiromitsu Ishii ◽  
...  
Keyword(s):  
Computer Graphics ◽  
Highway Tunnel ◽  
Lighting Environment

Effect of Non-Uniform Solar Temperature Field on Cable-Net Structure of Reflector of Large Radio Telescope-FAST

2009 ◽  
Vol 12 (4) ◽  
pp. 503-512 ◽  
Author(s):  
Feng Fan ◽  
Xiao-Fei Jin ◽  
Shi-Zhao Shen
Keyword(s):  
Temperature Field ◽  
Radio Telescope ◽  
Element Model ◽  
Wave Radiation ◽  
Worst Case ◽  
Climate Conditions ◽  
Surrounding Environment ◽  
Long Wave ◽  
Structural Temperature ◽  
Reflector Geometry

The effect of a non-uniform solar temperature field on the cable-net structure of the reflector of a five-hundred-meter aperture spherical radio telescope-FAST was analyzed using the thermal analysis module of ANSYS. The integral parametric finite element model of the reflector structure with its measured landform was built, and the boundary conditions of periodic air temperature, solar radiation, long-wave radiation and shadows of surrounding environment, etc, were computed at intervals of half an hour under a cloudless sky on a summer day, as one of the worst-case climate conditions. The transient structural temperatures were then analyzed under sunshine which lasted for several days with a rational initial structural temperature distribution until the whole set of structural temperatures converged to the results obtained the day before. The corresponding structural analysis was then carried out. The results indicate that the highest local temperature difference goes up to 11° and the maximum r.m.s. error of fitting of the reflector geometry is about 2.2mm.

The Simulation Analysis of Tunnel Wind Cooling System in Shenyang Area

2013 ◽  
Vol 724-725 ◽  
pp. 1474-1477
Author(s):  
Xiao Ming Zhang ◽  
Yang Gao ◽  
Xiao Zhang
Keyword(s):  
Optimization Design ◽  
Simulation Analysis ◽  
Cooling System ◽  
System Optimization ◽  
Simulation Software ◽  
Equivalent Diameter ◽  
Tunnel Length ◽  
Surrounding Areas ◽  
Entrance Velocity ◽  
Tunnel Entrance

Applied FLUENT simulation software to research the influence of tunnel length, tunnel entrance velocity, tunnel equivalent diameter and tunnel buried depth four important factors on the tunnel wind cooling system in Shenyang area. The results show that, with the increase of tunnel length and tunnel buried depth and with the decrease of tunnel entrance velocity and tunnel equivalent diameter, the outdoor air which passed into the tunnel cooling amplitude increases. For the tunnel wind cooling system optimization design in Shenyang area and the surrounding areas, the advices are that tunnel buried depth should not be more than 6m and tunnel entrance velocity should not be more than 5m/s.

Optimization Design of Shading Shed Transmittance in Highway Tunnel Entrance

2012 ◽  
Vol 605-607 ◽  
pp. 24-27
Author(s):  
Guo Chun Zhang ◽  
Han Bai ◽  
Hao Xue Liu ◽  
Bin Hua Zhang
Keyword(s):  
Quantitative Analysis ◽  
Optimal Design ◽  
Optimization Design ◽  
Qualitative And Quantitative Analysis ◽  
Design Algorithm ◽  
Qualitative And Quantitative ◽  
Highway Tunnel ◽  
Analysis Methods ◽  
Visual Characteristics ◽  
Tunnel Entrance

Shading shed transmittance of highway tunnel entrance should be designed to be compatible with the driver visual characteristics. By using qualitative and quantitative analysis methods, change law between pupil area and illumination was found through driver visual characteristics experiments in tunnel entrance. Optimal design algorithm of shading shed transmittance in highway tunnel entrance was established. Nanwutai tunnel on Baotou to Maoming highway are selected as research case to prove the model. The results of this study provide evidence that the model has obvious superiority.

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