PXW型摆辗机摆动机构运动学问题初探

给出了PXW型摆辗机摆头运动机构的机构运动简图,并据此认为具有多种摆头运动轨迹之摆辗机摆杆轴线上除顶点以外的各点只能是作球面运动,因而以往在摆头运动轨迹分析中将其简化为平面杆系势必引入误差.注意到这一点将有助于摆辗机的结构设计和对摆辗加工中应力-应变的分析.     

清洁化生产IGCC装置大有前途

IGCC技术是上世纪80年代迅速推广的可实现清洁化生产的工艺技术。由于可以处理炼油生产中的劣质产品如沥青、渣油和高硫石油焦等，炼油厂要实现清洁化生产，以石油焦做气化原料的IGCC装置会大有前途。     

城市生活垃圾的源头分类收集

为了便于生活垃圾的源头分类收集，文中将垃圾分为资源垃圾、有机质垃圾、有毒有害拉圾、特殊垃圾及其他垃圾，并和归纳了各类垃圾的行之有效的书信方法，指出了垃圾源头分类收集是实现垃圾减量法化、资源化和无源化的必由之路。     

有机膨润土吸附对硝基苯酚的性能及其在水处理中的应用初探

分别用溴化十六烷基三甲铵（ＣＴＭＡＢ）和氯化十六烷基吡啶（ＣＰＣ）改性膨润土，研究了制备有机膨润土的适宜条件及其对吸附对对硝基苯酚性能的影响。２５℃时，ＣＴＭＢ－膨润土和ＣＰＣ－膨润土对对硝基苯酚的饱和吸附量分别为４７５ｍｇ／ｇ，远大于原土的饱和吸附量（１２５ｍｇ／ｇ）。ｐＨ〉７时，有机膨润土吸附处理对硝基苯酚的去除率都在８５％以上，比原土的去除率（８．６％）大９倍，通过Ｘ－衍射、红外光谱分析、比     

超塑性恒压充模胀形过程中材料的流动和充填规律

采用刚粘塑性有限元法模拟超塑性恒压充模胀形过程,给出了材料质点的流动轨迹和不同时刻的胀形件剖面形状,分析了模具几何形状参数对单元贴模次序、贴模部位的影响。     

Assessing outdoor air quality vertically in an urban street canyon and its response to microclimatic factors

The vertical distribution of air pollutants in urban street canyons is closely related to residents’ health. However, the vertical air quality in urban street canyons has rarely been assessed using field observations obtained throughout the year. Therefore, this study investigated the seasonal and annual concentrations of particulate matter (PM_2.5 and PM₁₀), CO, NO₂, SO₂, O₃, air quality index, and their responses to microclimatic factors at three height levels (1.5, 27, and 69 m above street level) in an urban street canyon. The PM concentration was higher at 27 m than at 1.5 m in winter, whereas the situation was reversed in other seasons. It was found that photochemical pollutants such as NO₂ and O₃ were the primary pollutants in the urban street canyon. The days on which O₃ was the primary pollutant at the height of 1.5 m accounted for 81.07% of the entire year. The days on which NO₂ was the primary pollutant at the height of 27 and 69 m accounted for 82.49% and 72.33% of the entire year, respectively. Substantially higher concentrations of NO₂ and O₃ were found at the height of 27 m than at 69 m. In-canyon concentrations of NO₂ and O₃ were strongly correlated with air temperature, wind speed, and wind direction, which played important roles in photochemical reactions and pollutant dispersion.     

苏南志留—第三系岩石力学性质及节理形成机制探讨

对苏南地区志留—第三系进行了系统的岩石力学性质测试,包括岩石抗压强度、抗张强度、抗剪切强度、弹性模量和泊松比值。测试结果表明,苏南存在多个岩石力学突变层;影响岩石力学性质的因素主要为岩石类型、组构、结晶程度和受力方向等。本文还讨论了在区域应力场作用下,节理形成机制和应力转化过程。节理形成通常与岩石中各种缺陷有关,在缺陷处应力易于集中。节理具有多种成因机制。     

Variability of turbulence dispersion characteristics during heavy haze process: A case study in Beijing

The turbulent standard deviations and the turbulent third-order and fourth-order moments are the key turbulence dispersion parameters in Lagrangian dispersion models. However, the characteristics of these parameters under heavy haze conditions in urban areas have not been fully investigated, and the commonly used similarity relations of these parameters in models were based on observations in highly flat and sparsely populated areas. In this paper, the vertical profiles of these parameters and their local similarity relations under heavy haze conditions in the wintertime of Beijing have been analyzed by using data collected at a 325-m meteorological tower. The heavy haze process has been divided into three stages: transport stage (TS), cumulative stage (CS), and dispersion stage (DS). Results show that the turbulent dispersion parameters behave differently during three stages. In the TS and DS, the maxima appear in the profiles of the turbulent standard deviations above the urban canopy; in the CS, the turbulent standard deviation are almost constant with height. The analysis of the third and fourth order moments shows that the wind velocities above the urban canopy in the TS deviate from the Gaussian distribution more significantly than those in the CS and DS. The local similarity relations of the turbulent dispersion parameters in the TS, especially for the longitudinal wind components, are normally different from those in the CS and DS. Thus, different from the common assumptions in Lagrangian models, the turbulence dispersion in horizontal directions is anisotropic and should be parameterized by multiple similarity relations under heavy haze conditions.     

低质量浓度2-硝基-4′-羟基二苯胺暴露对鲫鱼鳃组织HSP70诱导的影响

采用实验室模拟的方法，以日本锦鲫（Carassius auratus）作为实验生物，运用SDS变性胶（SDS-PAGE）蛋白电泳和免疫印迹（Western Blotting）等分子生物学技术，研究了1mg／L 2-硝基-4’-羟基二苯胺（HC Orange No．1）在不同暴露时期对鲫鱼鳃组织应激蛋白HSP70诱导表达的情况，并探讨了鲫鱼鳃组织HSP70作为该有机污染物生物标志物的可行性。结果表明：鲫鱼鳃组织HSP70在暴露2d后相对于空白对照组开始有显著的表达（P〈0．05），并随着暴露天数的增加其表达量显著增加；在暴露4d后其表达量达到最大值；在暴露7d后其表达量开始下降，但可能由于长时间的有机物毒性胁迫，造成了鲫鱼鳃组织损伤和病变，HSP70在随后的暴露时间段内表达量明显下降，均显著低于空白对照组（P〈0．05），因此，鲫鱼鳃组织HSP70并不适宜作为该有机污染物在自然界水生生态系统中的生物标志物。     

铜陵市硫酸渣的综合利用

铜陵市的硫酸渣经过磁化焙烧—球磨—磁选,可以生产出含铁品位为64.13%、没有硫酸渣任何残余特征的优质铁精矿粉.