The object of is to evaluate assimilable organic carbon（AOC） degradation rate by intensified biological technique in advanced water treatment. By artificially acclimating and cultivating strains attached onto carbon...The object of is to evaluate assimilable organic carbon（AOC） degradation rate by intensified biological technique in advanced water treatment. By artificially acclimating and cultivating strains attached onto carbon surface, the selected strains can be intensified for their degradation to organic matters. The research indicates that ozonation process increases AOC concentration considerably, however, it is beneficial to microdegradation. Temperature and empty bed contact time （ TEBC ） are two important factors affecting microbiology. From 14 to 27 ℃, intensified biological carbon can remove AOC better compared with granular activated carbon （GAC）. Under identical TERC, intensified technique increases more than 10% AOC reduction.展开更多
Nanoparticles drug delivery system has sustained and controlled release features as well as targeted drug delivery, which can change the characteristics of drug distribution in vivo. It can increase the stability of t...Nanoparticles drug delivery system has sustained and controlled release features as well as targeted drug delivery, which can change the characteristics of drug distribution in vivo. It can increase the stability of the drug and enhance drug bioavailability. The selective targeting of nanoparticles can be achieved through enhanced permeability and retention effect and a conjugated specific ligand or through the effects of physiological conditions, such as pH and temperature. Nanoparticles can be prepared by using a wide range of materials and can be used to encapsulate chemotherapeutic agents to reduce toxicity, which can be used for imaging, therapy, and diagnosis. In this research, recent progress on nanoparticles as a targeted drug delivery system will be reviewed, including positive-targeting, negative-targeting, and physicochemical-targeting used as anticancer drug carriers.展开更多
This paper examines the connections among sustain- ability, governance and GDP, using the data from 123 countries. Sustainability is found to be related with GDP in two contradic- tory ways. On the one hand, growth in...This paper examines the connections among sustain- ability, governance and GDP, using the data from 123 countries. Sustainability is found to be related with GDP in two contradic- tory ways. On the one hand, growth in GDP strengthens a nation’s ability to maintain favorable environmental conditions into the future. On the other hand, GDP growth is built on more consump- tion of natural resources, and therefore generates a larger “foot- print” on the Earth. Governance plays a key role in sustainable development. However, it is not helping to reduce our footprint on the Earth. In fact, good governance is linked to a larger footprint. This reflects our materialist value and human impulse. When a society prefers the comfort and well-being of human beings to the welfare of its environment, democratic governance might be used as an effective tool against nature.展开更多
We study the stabilization of the soliton transported bio-energy by the dynamic equations in the improved Davydov theory from four aspects containing the feature of free motion and states of the soliton at the long-ti...We study the stabilization of the soliton transported bio-energy by the dynamic equations in the improved Davydov theory from four aspects containing the feature of free motion and states of the soliton at the long-time motion and at biological temperature 300 K and behaviors of collision of the solitons by Runge–Kutta method and physical parameter values appropriate to the α-helix protein molecules. We prove that the new solitons can move without dispersion at a constant speed retaining its shape and energy in free and long-time motions and can go through each other without scattering. If considering further influence of the temperature effect of heat bath on the soliton, it is still thermally stable at biological temperature 300 K and in a time as long as 300 ps and amino acid spacings as large as 400, which shows that the lifetime of the new soliton is at least 300 ps, which is consistent with analytic result obtained by quantum perturbation theory. These results exhibit that the new soliton is a possible carrier of bio-energy transport and the improved model is possibly a candidate for the mechanism of this transport.展开更多
目的探讨3种新生儿转诊评分对转诊早产低出生体重儿死亡风险评估的价值.方法对2016年1月1日至2016年12月31日转诊至湖南省儿童医院新生儿科的649例胎龄<37周及出生体重<2 500g的早产低出生体重儿进行新生儿转运稳定生理指数( tran...目的探讨3种新生儿转诊评分对转诊早产低出生体重儿死亡风险评估的价值.方法对2016年1月1日至2016年12月31日转诊至湖南省儿童医院新生儿科的649例胎龄<37周及出生体重<2 500g的早产低出生体重儿进行新生儿转运稳定生理指数( transport risk index of physiologic stability,TRIPS)、新生儿转运死亡指数(mortality index for neonatal transportation score,MINT)及转运相关死亡评分(transport related mortality score,TREMS).结果死亡组中TRIPS、MINT、TREMS评分明显高于生存组(P<0.001).多因素Logistic回归分析显示,TRIPS中收缩压、弹足底反应、呼吸中的气管插管进入回归方程,MINT中出生体重、血pH值、打电话时是否气管插管进入回归方程,TREMS中低血压、低氧血症、高碳酸血症进入回归方程,这表明上述指标为早产低出生体重儿发生死亡的独立危险因素.TRIPS、MINT及TREMS在预测早产低出生体重儿死亡风险时ROC曲线下面积及95%CI分别为0.843(0.796,0.889)、0.796(0.722,0.871)和0.712(0.639,0.786).结论 TRIPS评分较MINT评分和TREMS评分对转诊早产低出生体重儿的转诊死亡风险预测准确性更高.展开更多
The atomistic mechanism for direct conversion of graphite to diamond is a long-standing problem in condensed matter physics. The newly identified cold-compressed graphite phases of M, W and 0 carbon provide a crucial ...The atomistic mechanism for direct conversion of graphite to diamond is a long-standing problem in condensed matter physics. The newly identified cold-compressed graphite phases of M, W and 0 carbon provide a crucial link to understand the graphite-to- diamond phase transformation. We demonstrate by ab initio calculations that pressure has a dual role in lowering the conversion barrier and enhancing the production stability during the first-stage cold-compressed phase conversion of graphite toward the intermediate metastable M, W and 0 carbon phases. However, it has little effect on the relative enthalpy and high conversion barrier during the second-stage conversion process toward the diamond polytypes, showing a temperature dominated conversion process. These results may give explanation regarding the necessity of high pressure and high temperature during the graphite-to- diamond reaction.展开更多
In this paper, a model of Beddington-DeAngelies chemostat involving two species of micro-organism competing for two perfectly complementary growth-limiting nutrients and pulsed input of toxicant in the polluted enviro...In this paper, a model of Beddington-DeAngelies chemostat involving two species of micro-organism competing for two perfectly complementary growth-limiting nutrients and pulsed input of toxicant in the polluted environment was studied. Using Floquet theory and small amplitude perturbation method, a conclusion was that there exists twomicro-organism eradication periodic solution and which is global asymptotical stability. At the same time, the condition of the permanence for system was obtained. From the biological point of view, the method for protecting species is to improve the amount of impulsive period, and control the amount of toxicant input to the chemostat. Finally, our results are illustrated by numerical simulations.展开更多
基金Sponsored by China Postdoctoral Science Foundation (Grant No.20060400178) and Shanghai Postdoctoral Scientific Program(Grant No.06R214204).
文摘The object of is to evaluate assimilable organic carbon（AOC） degradation rate by intensified biological technique in advanced water treatment. By artificially acclimating and cultivating strains attached onto carbon surface, the selected strains can be intensified for their degradation to organic matters. The research indicates that ozonation process increases AOC concentration considerably, however, it is beneficial to microdegradation. Temperature and empty bed contact time （ TEBC ） are two important factors affecting microbiology. From 14 to 27 ℃, intensified biological carbon can remove AOC better compared with granular activated carbon （GAC）. Under identical TERC, intensified technique increases more than 10% AOC reduction.
基金Supported by a grant from the foundation of Guangzhou Municipal Key Project for Special Scientific Plan(No.2008A1-E4101)
文摘Nanoparticles drug delivery system has sustained and controlled release features as well as targeted drug delivery, which can change the characteristics of drug distribution in vivo. It can increase the stability of the drug and enhance drug bioavailability. The selective targeting of nanoparticles can be achieved through enhanced permeability and retention effect and a conjugated specific ligand or through the effects of physiological conditions, such as pH and temperature. Nanoparticles can be prepared by using a wide range of materials and can be used to encapsulate chemotherapeutic agents to reduce toxicity, which can be used for imaging, therapy, and diagnosis. In this research, recent progress on nanoparticles as a targeted drug delivery system will be reviewed, including positive-targeting, negative-targeting, and physicochemical-targeting used as anticancer drug carriers.
文摘This paper examines the connections among sustain- ability, governance and GDP, using the data from 123 countries. Sustainability is found to be related with GDP in two contradic- tory ways. On the one hand, growth in GDP strengthens a nation’s ability to maintain favorable environmental conditions into the future. On the other hand, GDP growth is built on more consump- tion of natural resources, and therefore generates a larger “foot- print” on the Earth. Governance plays a key role in sustainable development. However, it is not helping to reduce our footprint on the Earth. In fact, good governance is linked to a larger footprint. This reflects our materialist value and human impulse. When a society prefers the comfort and well-being of human beings to the welfare of its environment, democratic governance might be used as an effective tool against nature.
基金The project supported by National Natural Science Foundation of China under Grant No.19974034
文摘We study the stabilization of the soliton transported bio-energy by the dynamic equations in the improved Davydov theory from four aspects containing the feature of free motion and states of the soliton at the long-time motion and at biological temperature 300 K and behaviors of collision of the solitons by Runge–Kutta method and physical parameter values appropriate to the α-helix protein molecules. We prove that the new solitons can move without dispersion at a constant speed retaining its shape and energy in free and long-time motions and can go through each other without scattering. If considering further influence of the temperature effect of heat bath on the soliton, it is still thermally stable at biological temperature 300 K and in a time as long as 300 ps and amino acid spacings as large as 400, which shows that the lifetime of the new soliton is at least 300 ps, which is consistent with analytic result obtained by quantum perturbation theory. These results exhibit that the new soliton is a possible carrier of bio-energy transport and the improved model is possibly a candidate for the mechanism of this transport.
文摘目的探讨3种新生儿转诊评分对转诊早产低出生体重儿死亡风险评估的价值.方法对2016年1月1日至2016年12月31日转诊至湖南省儿童医院新生儿科的649例胎龄<37周及出生体重<2 500g的早产低出生体重儿进行新生儿转运稳定生理指数( transport risk index of physiologic stability,TRIPS)、新生儿转运死亡指数(mortality index for neonatal transportation score,MINT)及转运相关死亡评分(transport related mortality score,TREMS).结果死亡组中TRIPS、MINT、TREMS评分明显高于生存组(P<0.001).多因素Logistic回归分析显示,TRIPS中收缩压、弹足底反应、呼吸中的气管插管进入回归方程,MINT中出生体重、血pH值、打电话时是否气管插管进入回归方程,TREMS中低血压、低氧血症、高碳酸血症进入回归方程,这表明上述指标为早产低出生体重儿发生死亡的独立危险因素.TRIPS、MINT及TREMS在预测早产低出生体重儿死亡风险时ROC曲线下面积及95%CI分别为0.843(0.796,0.889)、0.796(0.722,0.871)和0.712(0.639,0.786).结论 TRIPS评分较MINT评分和TREMS评分对转诊早产低出生体重儿的转诊死亡风险预测准确性更高.
基金supported by the National Natural Science Foundation of China(Grant No.11274356)the Ministry of Environmental Protection of China(Grant Nos.200909086 and 201109037)
文摘The atomistic mechanism for direct conversion of graphite to diamond is a long-standing problem in condensed matter physics. The newly identified cold-compressed graphite phases of M, W and 0 carbon provide a crucial link to understand the graphite-to- diamond phase transformation. We demonstrate by ab initio calculations that pressure has a dual role in lowering the conversion barrier and enhancing the production stability during the first-stage cold-compressed phase conversion of graphite toward the intermediate metastable M, W and 0 carbon phases. However, it has little effect on the relative enthalpy and high conversion barrier during the second-stage conversion process toward the diamond polytypes, showing a temperature dominated conversion process. These results may give explanation regarding the necessity of high pressure and high temperature during the graphite-to- diamond reaction.
基金Acknowledgment This work is supported by Natural Science Foundation of Shanxi Province （2013011002-2）.
文摘In this paper, a model of Beddington-DeAngelies chemostat involving two species of micro-organism competing for two perfectly complementary growth-limiting nutrients and pulsed input of toxicant in the polluted environment was studied. Using Floquet theory and small amplitude perturbation method, a conclusion was that there exists twomicro-organism eradication periodic solution and which is global asymptotical stability. At the same time, the condition of the permanence for system was obtained. From the biological point of view, the method for protecting species is to improve the amount of impulsive period, and control the amount of toxicant input to the chemostat. Finally, our results are illustrated by numerical simulations.
