Based on seven carbon sources including chemical fertilizer, pesticide, agricultural film, nitrogen fertilization, agricultural machinery, irri- gation and straw burning, the carbon emissions in agricultural productio...Based on seven carbon sources including chemical fertilizer, pesticide, agricultural film, nitrogen fertilization, agricultural machinery, irri- gation and straw burning, the carbon emissions in agricultural production of China during 1995-2011 was calculated. The results showed that both total agricultural carbon emission and per capita agricultural carbon emission overall presented growth trends, and the growth rate began to slow in recent years. The agricultural carbon emission intensity decreased year by year. Straw burning was the primary carbon source in China＇s agricul- ture, followed by chemical fertilizer. Total agricultural carbon emission in China in 17 years experienced three stages of ＂fluctuated growth -slow drop-new growth＂. Finally, suggestions and countermeasures of the low-carbon agriculture development in China from three aspects were proposed.展开更多
The robust D stabilization problem is considered for singular systems with polytopic uncertainties in this paper.Both the derivative matrix E and the state matrix A are with uncertainties,which were not considered bef...The robust D stabilization problem is considered for singular systems with polytopic uncertainties in this paper.Both the derivative matrix E and the state matrix A are with uncertainties,which were not considered before.First,with the introduction of some free matrices,a necessary and sufficient condition for the singular system to be D stable is proposed,based on which,the robust D stable problem is solved,and a sufficient condition for the closed system to be robust D stabilizable is obtained.The desired state feedback controller is given in an explicit expression.Numerical examples show the efficiency of the proposed approach.展开更多
Stereoelectroencephalography(SEEG)has been widely used in the presurgical evaluation of patients with medically intractable epilepsy.In the past,SEEG was commonly used as a method for mapping and localizing the epilep...Stereoelectroencephalography(SEEG)has been widely used in the presurgical evaluation of patients with medically intractable epilepsy.In the past,SEEG was commonly used as a method for mapping and localizing the epileptogenic zone(EZ).Since 2004,several studies have been conducted to examine the effectiveness of SEEG-guided radiofrequency thermocoagulation(RF-TC)in treating refractory epilepsy.However,the seizure-free and responder rates varied greatly across studies.We aimed to analyze the outcome of 56 patients who were treated with SEEG-guided RF-TC to evaluate the effectiveness of this treatment.SEEG-guided RF-TC can be considered as a treatment for refractory epilepsy.However,due to its limited efficacy,SEEG-guided RF-TC might be regarded as a temporary treatment performed under SEEG rather than a promising treatment for refractory epilepsy.展开更多
Pediatric brain tumors are a type of tumors that are commonly present in children and young adults.With the improvement of treatment,the quality of life,especially the cognitive functioning,is gaining increasingly mor...Pediatric brain tumors are a type of tumors that are commonly present in children and young adults.With the improvement of treatment,the quality of life,especially the cognitive functioning,is gaining increasingly more attention.Apart from cognitive evaluations,neuroimaging studies begin to play an important part in neurocognitive functioning investigation.In this way,the brain tissue changes caused by tumor variables(including tumor location and tumor size)and treatment variables(including surgery,chemotherapy and radiotherapy)can be detected by neuroimaging.Recent advancement of neuroimaging techniques,such as functionalMRI(f MRI)and diffusion tensor imaging(DTI),made great contributions to understanding cognitive dysfunction and quantifying the effects of tumor variables and treatment variables.In recent years,laminar-f MRI provided a potentially valuable tool for examining the exact origins of neural activity and cognitive function.On the other hand,molecular f MRI might guide diagnosis and treatment of brain disease in the future by using new biomarkers,and DTI can detect white matter changes and obtain some anatomically specific information.展开更多
文摘Based on seven carbon sources including chemical fertilizer, pesticide, agricultural film, nitrogen fertilization, agricultural machinery, irri- gation and straw burning, the carbon emissions in agricultural production of China during 1995-2011 was calculated. The results showed that both total agricultural carbon emission and per capita agricultural carbon emission overall presented growth trends, and the growth rate began to slow in recent years. The agricultural carbon emission intensity decreased year by year. Straw burning was the primary carbon source in China＇s agricul- ture, followed by chemical fertilizer. Total agricultural carbon emission in China in 17 years experienced three stages of ＂fluctuated growth -slow drop-new growth＂. Finally, suggestions and countermeasures of the low-carbon agriculture development in China from three aspects were proposed.
基金supported by the National Creative Research Groups Science Foundation of China(No.60721062)the National Natural Science Foundation of China(No.60736021)+1 种基金National Natural Science Foundation of China(No.60904011)the National High Technology Research and Development Program of China(863 Program)(No.2008AA042902)
文摘The robust D stabilization problem is considered for singular systems with polytopic uncertainties in this paper.Both the derivative matrix E and the state matrix A are with uncertainties,which were not considered before.First,with the introduction of some free matrices,a necessary and sufficient condition for the singular system to be D stable is proposed,based on which,the robust D stable problem is solved,and a sufficient condition for the closed system to be robust D stabilizable is obtained.The desired state feedback controller is given in an explicit expression.Numerical examples show the efficiency of the proposed approach.
文摘Stereoelectroencephalography(SEEG)has been widely used in the presurgical evaluation of patients with medically intractable epilepsy.In the past,SEEG was commonly used as a method for mapping and localizing the epileptogenic zone(EZ).Since 2004,several studies have been conducted to examine the effectiveness of SEEG-guided radiofrequency thermocoagulation(RF-TC)in treating refractory epilepsy.However,the seizure-free and responder rates varied greatly across studies.We aimed to analyze the outcome of 56 patients who were treated with SEEG-guided RF-TC to evaluate the effectiveness of this treatment.SEEG-guided RF-TC can be considered as a treatment for refractory epilepsy.However,due to its limited efficacy,SEEG-guided RF-TC might be regarded as a temporary treatment performed under SEEG rather than a promising treatment for refractory epilepsy.
文摘Pediatric brain tumors are a type of tumors that are commonly present in children and young adults.With the improvement of treatment,the quality of life,especially the cognitive functioning,is gaining increasingly more attention.Apart from cognitive evaluations,neuroimaging studies begin to play an important part in neurocognitive functioning investigation.In this way,the brain tissue changes caused by tumor variables(including tumor location and tumor size)and treatment variables(including surgery,chemotherapy and radiotherapy)can be detected by neuroimaging.Recent advancement of neuroimaging techniques,such as functionalMRI(f MRI)and diffusion tensor imaging(DTI),made great contributions to understanding cognitive dysfunction and quantifying the effects of tumor variables and treatment variables.In recent years,laminar-f MRI provided a potentially valuable tool for examining the exact origins of neural activity and cognitive function.On the other hand,molecular f MRI might guide diagnosis and treatment of brain disease in the future by using new biomarkers,and DTI can detect white matter changes and obtain some anatomically specific information.
