湿粒子喷射技术在国内外的应用

综述了国内外应用湿粒子喷射技术的状况，提出了铁路部门应用湿泣子喷射技术的前景及效益。

Removal Efficiency Simulation and Characterization Analysis of Particles Behavior in a Stormwater Wetland During Dry Days:A Case Study in Janghwa-do,Korea

Particles behaviour was monitored and analyzed in a stormwater wetland over a period of 4 months (June-September,2009).The results indicated that the particles behaviour can be affected by many processes,such as sedimentation,resuspension,adsorption and release in stormwater wetlands during dry days.Due to the effects of these factors,the particles removal efficiency calculated based on the settling theory was significantly higher than the value obtained using the measured particles number concentration.And the measured efficiency showed a turning point in the range of 2-4 μm,which was within the colloidal particles range.Analysis of particle size distribution showed that particles were finer in the outflow than inflow due to sedimentation of the coarse particles and resuspension of the fine particles in the wetland.Particles in different size ranges play different roles in their contribution to turbidity and total suspended solids concentration.The finer particles (less than 10μm) showed a closer relationship with the turbidity while coarser particles (>4μm) were more related to total suspended solid concentration.

A functional study of low molecular weight IgM from patients with autoimmune disease

High levels of low molecular weight (LMW) IgM in certain diseases are associated with clinical and laboratory indices which reflect the severity of the disease. These associations suggest that LMW IgM may play an important role in the immunopathogenesis of these diseases. To further approach the question concerning the functional activity of LMW IgM in disease, a panel of LMW IgM and high molecular weight (HMW) IgM preparations with or without rheumatoid factor (RF) activity were used to investigate their antibody binding activity and their effector function. It was found that LMW IgM-RF and HMW IgM-RF had a similar binding capacity to Fc fragment as there was no significant difference in the affinity index between them. It further showed that the rate of activation and total amount of utilization of complement by LMW IgM and HMW IgM was similar, although the mean fluorescence of C3 deposition by IgM-RF and HMW IgM-RF was slightly higher than that of LMW IgM-RF and other control RF antibodies. However, the current study demonstrated that LMW IgM had strong neutrophil activating properties when compared with HMW IgM. These findings suggest that one mechanism of LMW IgM contributing to the immunopathogenesis of RA may be due to the formation of circulating immune complex ( CIC) by LMW IgM with subsequent activation of neutrophils. Whether LMW IgM has other functional activity in disease is unclear and needs further investigation.

加大尾气燃烧炉顶热负荷提高炭黑质量

本文从理论和实践两个方面，对１．５万吨／年新工艺炭黑生产装置初始生产时尾气燃烧炉的预热问题，特别是干燥工序的设备和工艺控制进行了较系统的分析和探讨，找到了解决炭黑初始生产后湿炭黑粒子干燥的方法。

Climatic change features of fog and haze in winter over North China and Huang-Huai Area

This paper revealed the climatic change characteristics of fog and haze of different levels over North China and Huang-Huai area(NCHH).It was found that the haze-prone period has changed from winter into a whole year,and the haze days(HD)in winter have increased significantly.The foggy days(FD)are half of HD.There are little difference on the number of days and trends of fog at various levels.The HD and FD show no obvious positive correlation until the 1980s.Fog has larger spatial scale,showing more in the south than in the north.Haze occurs mainly around large cities with a discrete distribution.In the background of weakened East Asian Winter Monsoon(EAWM)and sufficient particulate matter,the negative correlation between haze and wind speed is weakened,but the positive correlation between haze and moisture conditions(precipitation and humidity)is significantly strengthened.In recent years,small wind and variability appear frequently.Meanwhile,as the stable source and strong moisture absorption of the aerosol particles,the moisture condition becomes one key control factor in the haze,especially wet haze with less visibility.In contrast,the FD presents a stable positive correlation with precipitation and relative humidity,but has no obvious negative correlation with wind speed.

Potential Contribution of Combined Atmospheric Ca^(2+) and Mg^(2+) Wet Deposition Within the Continental U.S. to Soil Inorganic Carbon Sequestration

Soil inorganic carbon （SIC） stocks continuously change from the formation of pedogenic carbonates, a process requiring inputs of Ca2＋ and Mg2＋ ions. This study ranked the soil orders in terms of potential inorganic carbon sequestration resulting from wet Ca2＋ and Mg2＋ deposition from 1994 to 2003 within the continental United States. The analysis revealed that average annual atmospheric wet deposition of Ca2＋ and Mg2＋ was the highest in the Central Midwest-Great Plains region, likely due to soil particle input from loess-derived soils. The soil orders receiving the highest total average annual atmospheric wet Ca2＋ and Mg2＋ deposition, expressed as potential inorganic carbon formation （barring losses from erosion and leaching）, were： 1） Mollisols （1.1 × 10^8 kg C）, 2） Alfisols （8.4 × 10^7 kg C）, 3） Entisols （3.8 × 10^7 kg C）, and 4） Aridisols （2.8 × 10^7 kg C）. In terms of area-normalized result, the soil orders were ranked： 1） Histosols （73 kg C km-2）, 2） Alfisols and Vertisols （64 kg C km-2）, 3） Mollisols （62 kg C km-2）, and 4） Spodosols （52 kg C kin-2）. The results of this study provide an estimate of potential soil inorganic carbon sequestration as a result of atmospheric wet Ca2＋ and Mg2＋ deposition, and this information may be useful in assessing dynamic nature of soil inorganic carbon pools.

Humidity-responsive nanocomposite of gold nanoparticles and polyacrylamide brushes grafted on Ag film: synthesis and application as plasmonic nanosensor

A general stepwise strategy for the preparation of new humidity-responsive plasmonic nanosensor was described for the first time, based on Ag film functionalization by polyacrylamide（PAAM） brushes via surface-initiated atom transfer radical polymerization（SI-ATRP） method and then assembled with gold nanoparticles（Au NPs）. We designed by this way a new plasmonic device made of Au NPs embedded in a humid vapor responsive polymer layer on Ag film and extensively characterized by surface-enhanced Raman scattering（SERS）. When the relative humidity（RH） is above 50%, the number of plasmonic hotspots decreases, causing SERS signal reduced noticeably, for the volume expansion of PAAM brushes varied the nano-gap between closely spaced Au NPs, and between Au NPs and Ag film. The reversible optical properties of the prepared nanocomposite tuned by RH were probed through SERS using 4-mercaptopyridine（4-Mpy） as a molecular probe, and the decrease of the RH reversibly induces a significant enhancement of the 4-Mpy SERS signal. By means of the high reversibility, the RH responsive nanocomposite developed in this paper provides a dynamic SERS platform and can be applied as plasmonic nanosensor which is proved to be stable for at least two months.