The problems including excessive flow of attemperating water for boiler, failure of butterfly valve at the outlet of circulating water pump, burnt-out of thyristor for excitation regulator, load variation rate of CCS ...The problems including excessive flow of attemperating water for boiler, failure of butterfly valve at the outlet of circulating water pump, burnt-out of thyristor for excitation regulator, load variation rate of CCS not complying with the contract target, etc. occurred during start-up and debugging of two 600 MW generating units in Yangzhou No.2 Thermal Power Plant. Through analysis on these problems. the remedial measures were put forward, to which can be referred for similar units.展开更多
In recent years, many coal-producing countries have paid great atte ntion to the land subsidence caused by coal cutting. In China, because of the de nse population in coalfield areas, the land subsidence hazard is mor...In recent years, many coal-producing countries have paid great atte ntion to the land subsidence caused by coal cutting. In China, because of the de nse population in coalfield areas, the land subsidence hazard is more serious. A fter a brief analysis on the mechanism of land subsidence, this paper gives a co mprehensive and systematical account on all kinds of hazards caused by the land subsidence in China. The study shows that land subsidence has endangered land, b uildings, traffic and communication lines, dykes and dams. It also causes damage to ecological and social environment. In order to lessen the hazard of land sub sidence, preventive measures should be taken to reduce the collapse amount, such as extraction with stowing, banded mining system, succession and coordination m ining system, or high-pressure mudflow between rock strata. Measures of reinfor cing or moving certain buildings should also be taken to reduce the destructive degree. In order to harness the subsidence land and bring them under control for farming, measures should be taken such as filling with spoil or fine breeze, ex cavating the deeper and covering the shallower land.展开更多
This study examines the possibility of using live spirulina to biologically remove aqueous lead of low concentration (below 50 mg/L) from wastewater. The spirulina cells were first immersed for seven days in five wast...This study examines the possibility of using live spirulina to biologically remove aqueous lead of low concentration (below 50 mg/L) from wastewater. The spirulina cells were first immersed for seven days in five wastewater samples containing lead of different concentrations, and the growth rate was determined by light at wavelength of 560 nm. The 72 h-EC50 (72 h medium effective concentration) was estimated to be 11.46 mg/L (lead). Afterwards, the lead adsorption by live spirulina cells was conducted. It was observed that at the initial stage (0–12 min) the adsorption rate was so rapid that 74% of the metal was bio- logically adsorbed. The maximum biosorption capacity of live spirulina was estimated to be 0.62 mg lead per 105 alga cells.展开更多
Objective： To study the emergency management principles of severe trauma in hospital （injury severity score ≥ 16）. Methods： We used ＂ ATP principle＂ to manage severe traumatic patients. The ATP principle is co...Objective： To study the emergency management principles of severe trauma in hospital （injury severity score ≥ 16）. Methods： We used ＂ ATP principle＂ to manage severe traumatic patients. The ATP principle is composed of： 1 ） attending surgeons offering initial management （A） ; 2 ） teamwork commencement immediately after patients admitted to hospital （ T ） ; 3 ） parallel principle, ie, emergency resuscitation, evaluation and laboratory test performed simultaneously （P）. Clinical effects before and after applying ATP principle were retrospectively analyzed and compared. Results： During January 1, 2002 to December 31, 2003, 338 patients were treated without applying ATP principle, in which ISS was 25.9 ± 6.4, 152 cases died with the mortality being 39. 2%, and the time stayed in emergency department and the time to operation room after admission were （102.8±16.7） rain, （140.3 ±20.6） rain,respectively. During January 1, 2004 to December 31, 2005, 438 patients were treated based on ATP principle, in which ISS was 28.6 ± 7.8, 87 cases died with the mortality being 19.9%, and the time in emergency department and the time to operation room after admission were （69.5 ± 11.5） rain, （89.6 ±9 .3） min, respectively. ISS showed no significant difference between the two groups （ P 〉 0.05 ）, but the mortality, the time stayed in emergency department and the time to operation room after admission were greatly reduced and showed significant difference between the two groups （ P 〈 0.05 ）. Conclusions： Applying ATP principle to treat severe traumatic patients can shorten emergency treatment time in hospital and decrease mortality.展开更多
文摘The problems including excessive flow of attemperating water for boiler, failure of butterfly valve at the outlet of circulating water pump, burnt-out of thyristor for excitation regulator, load variation rate of CCS not complying with the contract target, etc. occurred during start-up and debugging of two 600 MW generating units in Yangzhou No.2 Thermal Power Plant. Through analysis on these problems. the remedial measures were put forward, to which can be referred for similar units.
文摘In recent years, many coal-producing countries have paid great atte ntion to the land subsidence caused by coal cutting. In China, because of the de nse population in coalfield areas, the land subsidence hazard is more serious. A fter a brief analysis on the mechanism of land subsidence, this paper gives a co mprehensive and systematical account on all kinds of hazards caused by the land subsidence in China. The study shows that land subsidence has endangered land, b uildings, traffic and communication lines, dykes and dams. It also causes damage to ecological and social environment. In order to lessen the hazard of land sub sidence, preventive measures should be taken to reduce the collapse amount, such as extraction with stowing, banded mining system, succession and coordination m ining system, or high-pressure mudflow between rock strata. Measures of reinfor cing or moving certain buildings should also be taken to reduce the destructive degree. In order to harness the subsidence land and bring them under control for farming, measures should be taken such as filling with spoil or fine breeze, ex cavating the deeper and covering the shallower land.
文摘This study examines the possibility of using live spirulina to biologically remove aqueous lead of low concentration (below 50 mg/L) from wastewater. The spirulina cells were first immersed for seven days in five wastewater samples containing lead of different concentrations, and the growth rate was determined by light at wavelength of 560 nm. The 72 h-EC50 (72 h medium effective concentration) was estimated to be 11.46 mg/L (lead). Afterwards, the lead adsorption by live spirulina cells was conducted. It was observed that at the initial stage (0–12 min) the adsorption rate was so rapid that 74% of the metal was bio- logically adsorbed. The maximum biosorption capacity of live spirulina was estimated to be 0.62 mg lead per 105 alga cells.
文摘Objective： To study the emergency management principles of severe trauma in hospital （injury severity score ≥ 16）. Methods： We used ＂ ATP principle＂ to manage severe traumatic patients. The ATP principle is composed of： 1 ） attending surgeons offering initial management （A） ; 2 ） teamwork commencement immediately after patients admitted to hospital （ T ） ; 3 ） parallel principle, ie, emergency resuscitation, evaluation and laboratory test performed simultaneously （P）. Clinical effects before and after applying ATP principle were retrospectively analyzed and compared. Results： During January 1, 2002 to December 31, 2003, 338 patients were treated without applying ATP principle, in which ISS was 25.9 ± 6.4, 152 cases died with the mortality being 39. 2%, and the time stayed in emergency department and the time to operation room after admission were （102.8±16.7） rain, （140.3 ±20.6） rain,respectively. During January 1, 2004 to December 31, 2005, 438 patients were treated based on ATP principle, in which ISS was 28.6 ± 7.8, 87 cases died with the mortality being 19.9%, and the time in emergency department and the time to operation room after admission were （69.5 ± 11.5） rain, （89.6 ±9 .3） min, respectively. ISS showed no significant difference between the two groups （ P 〉 0.05 ）, but the mortality, the time stayed in emergency department and the time to operation room after admission were greatly reduced and showed significant difference between the two groups （ P 〈 0.05 ）. Conclusions： Applying ATP principle to treat severe traumatic patients can shorten emergency treatment time in hospital and decrease mortality.
