The ordered bimodal mesoporous silica MCM-48 spheres were facile synthesized by mild- temperature post-synthesis H2O2 hydrothermal treatment of as-synthesized MCM-48. The results showed that H2O2 is indispensable for ...The ordered bimodal mesoporous silica MCM-48 spheres were facile synthesized by mild- temperature post-synthesis H2O2 hydrothermal treatment of as-synthesized MCM-48. The results showed that H2O2 is indispensable for simultaneously removing organic templates and forming ordered bimodal mesoporous silica MCM-48 spheres. The bimodal mesoporous MCM-48 was characterized by X-ray diffraction, transmission electron micrographs, FT-IR, and N2 adsorption-desorption, and a possible mechanism was proposed for the formation of bimodal mesoporous MCM-48.展开更多
This paper presents the characteristics of a double helix capacitance sensor for measurement of the liquid holdup in horizontal oil–water two-phase flow. The finite element method is used to calculate the sensitivity...This paper presents the characteristics of a double helix capacitance sensor for measurement of the liquid holdup in horizontal oil–water two-phase flow. The finite element method is used to calculate the sensitivity field of the sensor in a pipe with 20 mm inner diameter and the effect of sensor geometry on the distribution of sensitivity field is presented. Then, a horizontal oil–water two-phase flow experiment is carried out to measure the response of the double helix capacitance sensor, in which a novel method is proposed to calibrate the liquid holdup based on three pairs of parallel-wire capacitance probes. The performance of the sensor is analyzed in terms of the flow structures detected by mini-conductance array probes.展开更多
Patient suffering from lymphedema in both lower extremities was treated,acupuncture was carried out at Zhōngwǎn（中脘 CV 12）,Shuǐfēn（水分 CV 9）,ShuǐDào（水道 ST 28）,Zúsānlǐ（足三里 ST 36）,Yīnl&#...Patient suffering from lymphedema in both lower extremities was treated,acupuncture was carried out at Zhōngwǎn（中脘 CV 12）,Shuǐfēn（水分 CV 9）,ShuǐDào（水道 ST 28）,Zúsānlǐ（足三里 ST 36）,Yīnlíngquán（阴陵泉 SP 9）,Sānyīnjiāo（三阴交 SP 6）,Yánɡlínɡquán（阳陵泉 GB 34）,Tàichōng（太冲 LR 3） and Tàixī（太溪穴 KI 3）,and local TDP irradiation was also carried out to improve local blood circulation and promote lymph fluid backflow,and thus effectively alleviate lymphedema in both lower extremities. The treatment courses were short and painless,and no adverse eff ect was detected.展开更多
Isolation and purification of single-walled carbon nanotubes （SWCNTs） are prerequisites for their implementation in various applications. In this work, we present a fast （-5 min）, low-cost, and easily scalable ben...Isolation and purification of single-walled carbon nanotubes （SWCNTs） are prerequisites for their implementation in various applications. In this work, we present a fast （-5 min）, low-cost, and easily scalable bench-top approach to the extraction of high-quality isolated SWCNTs from bundles and impurities in an aqueous dispersion. The extraction procedure, based on aqueous two-phase （ATP） separation, is widely applicable to any SWCNT source （tested on samples up to 1.7 nm in diameter） and independent of defect density, purity, diameter, and length. The extracted dispersions demonstrate that the removal of large aggregates, small bundles, and impurities is comparable to that by density gradient ultracentrifugation, but without the need for high-end instrumentation. Raman and fluorescence-excitation spectroscopy, single-nanotube fluorescence imaging, atomic force and transmission electron microscopy, and thermogravimetric analysis all confirm the high purity of the isolated SWCNTs. By predispersing the SWCNTs without sonication （only gentle stirring）, full-length, pristine SWCNTs can be isolated （tested up to 20 μm）. Hence, this simple ATP method will find immediate application in the generation of SWCNT materials for all levels of nanotube research and applications, from fundamental studies to high-performance devices.展开更多
Water pollution control is an important part of the onerous long-term task of building a beautiful China. Based on water pollution data from the state-controlled monitoring sites and the manually compiled data on the ...Water pollution control is an important part of the onerous long-term task of building a beautiful China. Based on water pollution data from the state-controlled monitoring sites and the manually compiled data on the evolution of the river chief system(Hezhangzhi 河长制), we used the Difference in Differences(DID) technique to identify the policy effects of the system in local practice. Our findings show that the system has achieved preliminary management of water pollution but has not significantly reduced the main water pollutants. This may indicate that local governments have whitewashed the symptoms rather than addressing the root cause. In the course of comprehensively advancing the river chief system, better governance results will be achieved if all levels of government formulate clear and appropriate goals, design sound and feasible accountability mechanisms, and invite professional third-party agencies specializing in water quality testing to supervise the work.展开更多
基金ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.20872135） and the China National Tobacco Corporation （No.110200701007）.
文摘The ordered bimodal mesoporous silica MCM-48 spheres were facile synthesized by mild- temperature post-synthesis H2O2 hydrothermal treatment of as-synthesized MCM-48. The results showed that H2O2 is indispensable for simultaneously removing organic templates and forming ordered bimodal mesoporous silica MCM-48 spheres. The bimodal mesoporous MCM-48 was characterized by X-ray diffraction, transmission electron micrographs, FT-IR, and N2 adsorption-desorption, and a possible mechanism was proposed for the formation of bimodal mesoporous MCM-48.
基金Supported by the National Natural Science Foundation of China(50974095,41174109,61104148)the National Science and Technology Major Projects(2011ZX05020-006)
文摘This paper presents the characteristics of a double helix capacitance sensor for measurement of the liquid holdup in horizontal oil–water two-phase flow. The finite element method is used to calculate the sensitivity field of the sensor in a pipe with 20 mm inner diameter and the effect of sensor geometry on the distribution of sensitivity field is presented. Then, a horizontal oil–water two-phase flow experiment is carried out to measure the response of the double helix capacitance sensor, in which a novel method is proposed to calibrate the liquid holdup based on three pairs of parallel-wire capacitance probes. The performance of the sensor is analyzed in terms of the flow structures detected by mini-conductance array probes.
文摘Patient suffering from lymphedema in both lower extremities was treated,acupuncture was carried out at Zhōngwǎn（中脘 CV 12）,Shuǐfēn（水分 CV 9）,ShuǐDào（水道 ST 28）,Zúsānlǐ（足三里 ST 36）,Yīnlíngquán（阴陵泉 SP 9）,Sānyīnjiāo（三阴交 SP 6）,Yánɡlínɡquán（阳陵泉 GB 34）,Tàichōng（太冲 LR 3） and Tàixī（太溪穴 KI 3）,and local TDP irradiation was also carried out to improve local blood circulation and promote lymph fluid backflow,and thus effectively alleviate lymphedema in both lower extremities. The treatment courses were short and painless,and no adverse eff ect was detected.
文摘Isolation and purification of single-walled carbon nanotubes （SWCNTs） are prerequisites for their implementation in various applications. In this work, we present a fast （-5 min）, low-cost, and easily scalable bench-top approach to the extraction of high-quality isolated SWCNTs from bundles and impurities in an aqueous dispersion. The extraction procedure, based on aqueous two-phase （ATP） separation, is widely applicable to any SWCNT source （tested on samples up to 1.7 nm in diameter） and independent of defect density, purity, diameter, and length. The extracted dispersions demonstrate that the removal of large aggregates, small bundles, and impurities is comparable to that by density gradient ultracentrifugation, but without the need for high-end instrumentation. Raman and fluorescence-excitation spectroscopy, single-nanotube fluorescence imaging, atomic force and transmission electron microscopy, and thermogravimetric analysis all confirm the high purity of the isolated SWCNTs. By predispersing the SWCNTs without sonication （only gentle stirring）, full-length, pristine SWCNTs can be isolated （tested up to 20 μm）. Hence, this simple ATP method will find immediate application in the generation of SWCNT materials for all levels of nanotube research and applications, from fundamental studies to high-performance devices.
基金phased result of the major project of the National Social Science Fund of China “Research on China’s Economic Growth Potential and Impetus”(14ZDA023).
文摘Water pollution control is an important part of the onerous long-term task of building a beautiful China. Based on water pollution data from the state-controlled monitoring sites and the manually compiled data on the evolution of the river chief system(Hezhangzhi 河长制), we used the Difference in Differences(DID) technique to identify the policy effects of the system in local practice. Our findings show that the system has achieved preliminary management of water pollution but has not significantly reduced the main water pollutants. This may indicate that local governments have whitewashed the symptoms rather than addressing the root cause. In the course of comprehensively advancing the river chief system, better governance results will be achieved if all levels of government formulate clear and appropriate goals, design sound and feasible accountability mechanisms, and invite professional third-party agencies specializing in water quality testing to supervise the work.
