船舶尾气脱硫脱硝应用技术研究与发展趋势

船舶尾气排放中含有大量的硫氧化物、氮氧化物等颗粒物,对大气环境造成的污染已日趋受到国际社会的广泛关注。本文通过比较国内外现有的尾气脱硫脱硝处理工艺,从设计思路、设计原理、设计特点以及最新的研究方向等,展现了几种应用于船舶尾气脱硫脱硝的先进工艺。最后,本文指出脱硫脱硝一体化技术将是船舶尾气后处理技术的发展方向,具有广阔的市场前景。

ForceControl在工业锅炉脱硫脱硝上的应用

由于火力发电下的锅炉会产生大量含有硫和硝的化学物质,这些化学物质会随烟气排入到大气当中,对空气造成严重的污染,所以在火力发电中会加入各种设备对废气进行脱硫脱硝处理。为了能够实时检测到各种设备的运行状态以及当前烟气的排放状态,会在上位机应用组态软件进行实时监控。

Sorption and Fractionation of a Peat Derived Humic Acid by Kaolinite, Montmorillonite, and Goethite

Sorption of humic acid （HA） on mineral surfaces has a profound interest regarding the fate of hydrophobic organic contaminants （HOCs） and carbon sequestration in soils. The objective of our study is to determine the fractionation behavior of HA upon sorption on mineral surfaces with varying surface properties. HA was coated sequentially on kaolinite （1：1 clay）, montmorillonite （2：1 clay）, and goethite （iron oxide） for four times. The unadsorbed HA fractions were characterized by elemental analysis, diffuse reflectance infrared Fourier transform spectroscopy （DRIFT）, and solid state 13C nuclear magnetic resonance spectroscopy （NMR）. The mineral-HA complexes were characterized by DRIFT. Polarity index [（N＋O）/C] revealed higher polarity of the unadsorbed HA fractions after coating on kaolinite, reflecting that relatively higher polarity fractions of HA remain unadsorbed. Sorption of aiiphatic alcohol fraction along with carbohydrate was prominent on kaolinite surface. DRIFT results of the unadsorbed HA fractions indicated more sorption of aiiphatic moieties on both kaolinite and montmorillonite. DRIFT results of the unadsorbed HA fractions after sorption on kaolinite and goethite showed the sorption of the proteinaceons fractions of HA. The HA fractions obtained after coating on goethite showed significant sorption of carboxylic moieties. The results mentioned above comply reasonably well with the DRIFT spectra of the minerai-HA complexes. ^13C NMR results showed higher sorption of anomeric C on kaolinite surface. Higher sorption of paraffinic fraction waS observed on montmorillonite. NMR data inferred the sorption of carboxylic moieties on goethite surface. Overall, this study showed that aliphatic moieties of HA preferentially sorbed on kaolinite and montmorillonite, while carboxylic functional groups play a significant role in sorption of HA on goethite. The sorbed fractions of HA may modify the mineral surface properties, and thus, the interaction with organic contaminants.

Treatment of osteoporosis in men using dehydroepiandrosterone sulfate

OBJECTIVE: To study the effect of dehydroepiandrosterone sulfate (DHEAS) treatment of osteoporosis in men with T(BMD) > or = 2.5SD. METHODS: Eighty-six patients were randomly divided into two groups: treatment group (n = 44) and control group (n = 42). DHEAS (100 mg q.d.) was given to the treatment group for 6 months. Bone mineral density, (BMD), biochemical markers of bone absorption and formation and other serum biochemical markers were measured before and after DHEAS treatment. Drug side effects were also evaluated. RESULTS: After oral administration of DHEAS (100 mg q.d.) for 6 months, the serum concentrations of DHEAS and IGF-I in the treatment group were 93.75% +/- 16.1% and 17.71% +/- 4.2% higher respectively than those in the control group (P

南京国民政府时期县级狱政窳败问题

南京国民政府时期,现代法律理念尚未在各级政府中广泛传播和深入贯彻,狱政改良举步维艰。在县级层面,司法权和行政权未完全分离,大多数县级地区延续着县长兼理司法的旧传统,普遍存在未经改良的旧式监所。旧监所在经费、卫生、戒护、狱吏、监犯管理等方面积弊甚深,狱犯生存环境极为恶劣,致使越狱现象频繁发生。县级狱政的窳败,反映了南京国民政府制度与实践的剥离。对此问题,国民政府只能简单地惩戒县长,说明其司法管理效能的低下和应对时局的乏力。