七氟异丁腈混合气体等新型环保气体作为绝缘介质,在高压设备中的基础研究和关键技术研究已趋于成熟,新型环保电力设备系统也已在世界各地挂网运行。但是,目前仍缺乏针对七氟异丁腈这类新型环保气体的泄漏监测方法,严重威胁着电力作业安...七氟异丁腈混合气体等新型环保气体作为绝缘介质,在高压设备中的基础研究和关键技术研究已趋于成熟,新型环保电力设备系统也已在世界各地挂网运行。但是,目前仍缺乏针对七氟异丁腈这类新型环保气体的泄漏监测方法,严重威胁着电力作业安全。因此,提出了基于红外光谱的七氟异丁腈气体泄漏浓度检测方法,研究了多元回归计算方法及波长校正算法,基于所得校正系数,建立了七氟异丁腈自适应增强偏最小二乘模型(partial least squares regression,PLS)回归校正模型。此外,基于验证数据集与传统方法的横向性能对比,证明红外光谱可用于七氟异丁腈的泄漏监测,且自适应增强PLS回归校正识别方法的性能优于亮度温度光谱方法。展开更多
In this study, the efforts to reduce NOx and particulate matter （PM） emissions from a diesel engine using both ethanol-selective catalytic reduction （SCR） of NOx over an Ag/Al2O3 catalyst and a biodiesel-ethanol-d...In this study, the efforts to reduce NOx and particulate matter （PM） emissions from a diesel engine using both ethanol-selective catalytic reduction （SCR） of NOx over an Ag/Al2O3 catalyst and a biodiesel-ethanol-diesel fuel blend （BE-diesel） on an engine bench test are discussed. Compared with diesel fuel, use of BE-diesel increased PM emissions by 14% due to the increase in the soluble organic fraction （SOF） of PM, but it greatly reduced the Bosch smoke number by 60%-80% according to the results from 13-mode test of European Stationary Cycle （ESC） test. The SCR catalyst was effective in NOx reduction by ethanol, and the NOx conversion was approximately 73%. Total hydrocarbons （THC） and CO emissions increased significantly during the SCR of NOx process. Two diesel oxidation catalyst （DOC） assemblies were used after Ag/Al2O3 converter to remove CO and HC. Different oxidation catalyst showed opposite effect on PM emission. The PM composition analysis revealed that the net effect of oxidation catalyst on total PM was an integrative effect on SOF reduction and sulfate formation of PM. The engine bench test results indicated that the combination of BE-diesel and a SCR catalyst assembly could provide benefits for NOx and PM emissions control even without using diesel particle filters （DPFs）.展开更多
An activated carbon(AC)supported Pd catalyst was used to develop a highly efficient in situ adsorption-catalysis system for the removal of low concentrations of o-xylene.In this study,three kinds of Pd/AC catalysts we...An activated carbon(AC)supported Pd catalyst was used to develop a highly efficient in situ adsorption-catalysis system for the removal of low concentrations of o-xylene.In this study,three kinds of Pd/AC catalysts were prepared and tested to investigate the synergistic efficiency between adsorption and catalysis for o-xylene removal.The Pd/AC catalyst was first used as an adsorbent to concentrate dilute o-xylene at low temperature.After saturated adsorption,the adsorbed o-xylene was oxidized to CO_(2)and H20 by raising the temperature of the catalyst bed.The results showed that more than 99%of the adsorbed o-xylene was completely oxidized to CO_(2)over a 5%Pd/AC catalyst at 140℃.Brunauer-Emmett-Teller(BET)analysis,scanning electron microscopy(SEM),temperatureprogrammed desorption(TPD),and temperature-programmed oxidation(TPO)were applied to investigate the physical properties of o-xylene adsorption-desorption and the in situ adsorption-catalysis activity of the AC support and Pd/AC catalyst.A synergistic relationship between the AC support and the active Pd species for the removal of low concentrations of o-xylene was established.展开更多
Objective:Microcapsule chemoembolism is a promising treatment of tumors.We describe a deep lingual arterial embolization of tongue carcinoma with microcapsuled carboplatinum.Methods:Lingual artery cast specimens from ...Objective:Microcapsule chemoembolism is a promising treatment of tumors.We describe a deep lingual arterial embolization of tongue carcinoma with microcapsuled carboplatinum.Methods:Lingual artery cast specimens from cadavers were microscopically examined,and 78 patients with tongue cancer were recruited and treated with the deep lingual arterial embolization therapy.Results:Microcapsule embolism occurred approximately at the fifth or sixth level of the deep lingual artery branches.The five-year survival rate was 88.5%(69 out of 78),and the ten-year survival rate 52.6%(41 out of 78).Conclusion:The deep lingual arterial embolization of tongue carcinoma with microcapsuled carboplatinum is an effective therapy to treat carcinoma in mid-margin or mid-body of the tongue.展开更多
In view of the problem that the packet information preempted netw ork resources in the process of transmission in the CAN bus,w hich leads to the low utilization of netw ork resources and the low accuracy of informati...In view of the problem that the packet information preempted netw ork resources in the process of transmission in the CAN bus,w hich leads to the low utilization of netw ork resources and the low accuracy of information transmission. Thus,a hybrid scheduling algorithm NM TS based on CAN bus is proposed,in the NM TS hybrid scheduling algorithm,the dynamic scheduling algorithm EDF is used to schedule hard real-time messages to solve the problem of low utilization of netw ork resources; the static scheduling algorithm RM S is used to schedule soft real-time messages and non real-time messages,so as to solve the problem of low accuracy of information transmission. By using M ATLAB softw are,the CAN netw ork model can be built,the EDF algorithm,RM S algorithm and NM TS algorithm are simulated. The experimental results show that the netw ork resources utilization is 90%,the packet loss rate is 0% of the NM TS algorithm. Therefore,The hybrid scheduling algorithm based on CAN bus NM TS has the characteristics of high netw ork resource utilization and high accuracy of information transmission,w hich w ill be very helpful for further research of CAN bus.展开更多
文摘七氟异丁腈混合气体等新型环保气体作为绝缘介质,在高压设备中的基础研究和关键技术研究已趋于成熟,新型环保电力设备系统也已在世界各地挂网运行。但是,目前仍缺乏针对七氟异丁腈这类新型环保气体的泄漏监测方法,严重威胁着电力作业安全。因此,提出了基于红外光谱的七氟异丁腈气体泄漏浓度检测方法,研究了多元回归计算方法及波长校正算法,基于所得校正系数,建立了七氟异丁腈自适应增强偏最小二乘模型(partial least squares regression,PLS)回归校正模型。此外,基于验证数据集与传统方法的横向性能对比,证明红外光谱可用于七氟异丁腈的泄漏监测,且自适应增强PLS回归校正识别方法的性能优于亮度温度光谱方法。
基金This work was supported by the National Natural Science Foundation of China （No. 20425722, 20621140004）；the Ministry of Science and Technology of China （No. 2006AA060304）.
文摘In this study, the efforts to reduce NOx and particulate matter （PM） emissions from a diesel engine using both ethanol-selective catalytic reduction （SCR） of NOx over an Ag/Al2O3 catalyst and a biodiesel-ethanol-diesel fuel blend （BE-diesel） on an engine bench test are discussed. Compared with diesel fuel, use of BE-diesel increased PM emissions by 14% due to the increase in the soluble organic fraction （SOF） of PM, but it greatly reduced the Bosch smoke number by 60%-80% according to the results from 13-mode test of European Stationary Cycle （ESC） test. The SCR catalyst was effective in NOx reduction by ethanol, and the NOx conversion was approximately 73%. Total hydrocarbons （THC） and CO emissions increased significantly during the SCR of NOx process. Two diesel oxidation catalyst （DOC） assemblies were used after Ag/Al2O3 converter to remove CO and HC. Different oxidation catalyst showed opposite effect on PM emission. The PM composition analysis revealed that the net effect of oxidation catalyst on total PM was an integrative effect on SOF reduction and sulfate formation of PM. The engine bench test results indicated that the combination of BE-diesel and a SCR catalyst assembly could provide benefits for NOx and PM emissions control even without using diesel particle filters （DPFs）.
基金supported by the National Natural Science Foundation of China(No.20607029)the Ministry of Science and Technology of China(No.2007AA061402)
文摘An activated carbon(AC)supported Pd catalyst was used to develop a highly efficient in situ adsorption-catalysis system for the removal of low concentrations of o-xylene.In this study,three kinds of Pd/AC catalysts were prepared and tested to investigate the synergistic efficiency between adsorption and catalysis for o-xylene removal.The Pd/AC catalyst was first used as an adsorbent to concentrate dilute o-xylene at low temperature.After saturated adsorption,the adsorbed o-xylene was oxidized to CO_(2)and H20 by raising the temperature of the catalyst bed.The results showed that more than 99%of the adsorbed o-xylene was completely oxidized to CO_(2)over a 5%Pd/AC catalyst at 140℃.Brunauer-Emmett-Teller(BET)analysis,scanning electron microscopy(SEM),temperatureprogrammed desorption(TPD),and temperature-programmed oxidation(TPO)were applied to investigate the physical properties of o-xylene adsorption-desorption and the in situ adsorption-catalysis activity of the AC support and Pd/AC catalyst.A synergistic relationship between the AC support and the active Pd species for the removal of low concentrations of o-xylene was established.
文摘Objective:Microcapsule chemoembolism is a promising treatment of tumors.We describe a deep lingual arterial embolization of tongue carcinoma with microcapsuled carboplatinum.Methods:Lingual artery cast specimens from cadavers were microscopically examined,and 78 patients with tongue cancer were recruited and treated with the deep lingual arterial embolization therapy.Results:Microcapsule embolism occurred approximately at the fifth or sixth level of the deep lingual artery branches.The five-year survival rate was 88.5%(69 out of 78),and the ten-year survival rate 52.6%(41 out of 78).Conclusion:The deep lingual arterial embolization of tongue carcinoma with microcapsuled carboplatinum is an effective therapy to treat carcinoma in mid-margin or mid-body of the tongue.
文摘In view of the problem that the packet information preempted netw ork resources in the process of transmission in the CAN bus,w hich leads to the low utilization of netw ork resources and the low accuracy of information transmission. Thus,a hybrid scheduling algorithm NM TS based on CAN bus is proposed,in the NM TS hybrid scheduling algorithm,the dynamic scheduling algorithm EDF is used to schedule hard real-time messages to solve the problem of low utilization of netw ork resources; the static scheduling algorithm RM S is used to schedule soft real-time messages and non real-time messages,so as to solve the problem of low accuracy of information transmission. By using M ATLAB softw are,the CAN netw ork model can be built,the EDF algorithm,RM S algorithm and NM TS algorithm are simulated. The experimental results show that the netw ork resources utilization is 90%,the packet loss rate is 0% of the NM TS algorithm. Therefore,The hybrid scheduling algorithm based on CAN bus NM TS has the characteristics of high netw ork resource utilization and high accuracy of information transmission,w hich w ill be very helpful for further research of CAN bus.
