As a result of environmental degradation,urban green space has become a key issue for urban sustainable development.This paper takes Liaoyang City in Northeast China as an example to develop green space planning using...As a result of environmental degradation,urban green space has become a key issue for urban sustainable development.This paper takes Liaoyang City in Northeast China as an example to develop green space planning using the computational fluid dynamics (CFD) model,landscape ecological principles and Geographical Information System (GIS).Based on the influencing factors of topography,building density and orientation,Shou Mountain,Longding Mountain and the Taizi River were selected as the urban ventilation paths to promote wind and oxygen circulation.Oxygen concentration around the green spaces gradually decreased with wind speed increase and wind direction change.There were obvious negative correlation relationships between the oxygen dispersion concentration and urban layout factors such as the building plot ratio and building density.Comparison with the field measurements found that there was significant correlation relationship between simulated oxygen concentration and field measurements (R 2=0.6415,p<0.001),moreover,simulation precision was higher than 92%,which indicated CFD model was effective for urban oxygen concentration simulation.Only less than 10% areas in Liaoyang City proper needed more green space urgently to improve oxygen concentration,mainly concentrated in Baitai and west Wensheng districts.Based on land-scape ecology principle,green space planning at different spatial scales were proposed to create a green space network system for Liaoyang City,including features such as green wedges,green belts and parks.Totally,about 2012 ha of green space need to be constructed as oxygen sources and ventilation paths.Compared with the current green space pattern,proposed green space planning could improve oxygen concentration obviously.The CFD model and research results in this paper could provide an effective way and theory support for sustainable development of urban green space.展开更多
The PetroChina Liaoyang Petrochemical Company （LPC）has completed all commercial tests at its self-constructed200 t/a 1,4-cyclohexane dimethanol （CHDM） unit, whiledelivering qualified CHDM product with a purity of9...The PetroChina Liaoyang Petrochemical Company （LPC）has completed all commercial tests at its self-constructed200 t/a 1,4-cyclohexane dimethanol （CHDM） unit, whiledelivering qualified CHDM product with a purity of99.8% to provide reliable test data for formulating thePDP of an 10-kt/a class CHDM unit.展开更多
The Liaoyang Petrochemical Company has successfullydeveloped a novel ionic liquid catalyst for carbonylationof ethylene oxide with carbon dioxide to form ethylenecarbonate （EC）. This catalyst can achieve an 100 % co...The Liaoyang Petrochemical Company has successfullydeveloped a novel ionic liquid catalyst for carbonylationof ethylene oxide with carbon dioxide to form ethylenecarbonate （EC）. This catalyst can achieve an 100 % conversionand a 98% selectivity at low temperature andunder low pressure, featuring high catalytic activity, goodstability, good adaptability to feedstocks and low productioncost.展开更多
The supernatural Liaoyang is not only a root for some emperors but also a topic for many poets. How is Liaoyang in eyes of poets?Soldiers regarded Liaoyang as a battlefield
During the long historical development of North China, Liaoyang had stood at an important place in polity, military affairs, economy and culture. Therefore many outstanding f igures came forth in Liaoyang.
Faced with the opportunity of rejuvenating the old industrial base in Northeast China, the people in Liaoyang persist in the spirit of pioneer and hard work and thus make outstanding achievements. Respectively, Liaoya...Faced with the opportunity of rejuvenating the old industrial base in Northeast China, the people in Liaoyang persist in the spirit of pioneer and hard work and thus make outstanding achievements. Respectively, Liaoyang City展开更多
Liaoyang is one of a few ancient and famous cultural cities in China. It has a history over 2400 years. Early in the Warring States Period (475BC-221BC), Xiangping Town, the former name of Liaoyang, was set up here, w...Liaoyang is one of a few ancient and famous cultural cities in China. It has a history over 2400 years. Early in the Warring States Period (475BC-221BC), Xiangping Town, the former name of Liaoyang, was set up here, which indicated展开更多
Liaoyang, once a political, economic and cultural center in Northeast China, was a military important town, where many battles happened in its 2400-year history.
基金Under the auspices of National Key Technology Research and Development Program of China (No.2008BAJ10B01-01)National Natural Science Foundation of China (No.40801069)
文摘As a result of environmental degradation,urban green space has become a key issue for urban sustainable development.This paper takes Liaoyang City in Northeast China as an example to develop green space planning using the computational fluid dynamics (CFD) model,landscape ecological principles and Geographical Information System (GIS).Based on the influencing factors of topography,building density and orientation,Shou Mountain,Longding Mountain and the Taizi River were selected as the urban ventilation paths to promote wind and oxygen circulation.Oxygen concentration around the green spaces gradually decreased with wind speed increase and wind direction change.There were obvious negative correlation relationships between the oxygen dispersion concentration and urban layout factors such as the building plot ratio and building density.Comparison with the field measurements found that there was significant correlation relationship between simulated oxygen concentration and field measurements (R 2=0.6415,p<0.001),moreover,simulation precision was higher than 92%,which indicated CFD model was effective for urban oxygen concentration simulation.Only less than 10% areas in Liaoyang City proper needed more green space urgently to improve oxygen concentration,mainly concentrated in Baitai and west Wensheng districts.Based on land-scape ecology principle,green space planning at different spatial scales were proposed to create a green space network system for Liaoyang City,including features such as green wedges,green belts and parks.Totally,about 2012 ha of green space need to be constructed as oxygen sources and ventilation paths.Compared with the current green space pattern,proposed green space planning could improve oxygen concentration obviously.The CFD model and research results in this paper could provide an effective way and theory support for sustainable development of urban green space.
文摘The PetroChina Liaoyang Petrochemical Company （LPC）has completed all commercial tests at its self-constructed200 t/a 1,4-cyclohexane dimethanol （CHDM） unit, whiledelivering qualified CHDM product with a purity of99.8% to provide reliable test data for formulating thePDP of an 10-kt/a class CHDM unit.
文摘The Liaoyang Petrochemical Company has successfullydeveloped a novel ionic liquid catalyst for carbonylationof ethylene oxide with carbon dioxide to form ethylenecarbonate （EC）. This catalyst can achieve an 100 % conversionand a 98% selectivity at low temperature andunder low pressure, featuring high catalytic activity, goodstability, good adaptability to feedstocks and low productioncost.
文摘The supernatural Liaoyang is not only a root for some emperors but also a topic for many poets. How is Liaoyang in eyes of poets?Soldiers regarded Liaoyang as a battlefield
文摘During the long historical development of North China, Liaoyang had stood at an important place in polity, military affairs, economy and culture. Therefore many outstanding f igures came forth in Liaoyang.
文摘Faced with the opportunity of rejuvenating the old industrial base in Northeast China, the people in Liaoyang persist in the spirit of pioneer and hard work and thus make outstanding achievements. Respectively, Liaoyang City
文摘Liaoyang is one of a few ancient and famous cultural cities in China. It has a history over 2400 years. Early in the Warring States Period (475BC-221BC), Xiangping Town, the former name of Liaoyang, was set up here, which indicated
文摘Liaoyang, once a political, economic and cultural center in Northeast China, was a military important town, where many battles happened in its 2400-year history.
