聚丙烯腈纤维束对可吸入颗粒物的过滤特性研究

采用聚丙烯腈纤维束作为滤材,对粒度为-10μm占93%的可吸入颗粒物进行净化研究,考查了颗粒物入口浓度、过滤风速、纤维束填充率对纤维束过滤器除尘性能的影响。在最佳条件下,纤维束过滤器的最大除尘效率可达85%,随着时间的延长除尘效率会逐渐降低;压降主要受过滤风速的影响,在过滤器标准过滤风速1.0m/s时,压降仅为26～30Pa。压降和除尘效率随纤维束填充率的增加而增加,填充率1.06%时,除尘性能最佳。     

香烟烟雾下高压微静电强电介质过滤性能

以香烟烟雾为尘源,测试了颗粒污染物不同粒径分布时高分子聚合物强场电介质过滤材料的过滤效率、压力降、臭氧(O_3)产生量,以及组合过滤器的过滤效率随迎面风速的变化。结果表明:过滤效率随迎面风速的增大呈先增大后减小的趋势,峰值在风速1.0m/s左右,此时粒径大于0.5μm颗粒物的过滤效率超过65%;迎面风速越大,压力降也越大;O_3最大发生量为0.03 mg/m3,小于GB 3095—2012限值。在风速约为0.85m/s时,对于粒径≥1.0μm的颗粒物,组合过滤器的过滤效率最大,为99.31%。参照欧盟关于过滤器分级的标准,高分子聚合物强场电介质材料可替代部分传统中效过滤器。     

不同填料生物过滤去除H2S恶臭影响研究

生物过滤处理恶臭气体中大量存在的H2S.采用污水处理厂的活性污泥进行驯化和培养，以陶粒和活性炭作为填料，在停留时间为18.7～150 s时，浓度为1.5×10-4、4.5×10-4、1.5×10-3时，去除效率均在99%以上.浓度大时，活性炭滤柱的作用效果要明显优于陶粒滤柱.反冲洗可以降低滤柱的压降，短时间内对去除效果有影响，但很快可以恢复.在滤柱的前段承担去除大部分H2S臭气.建议实际设计中可以采用多点进气方式或适当降低滤柱高度.填料的选择可以考虑加入适当比例的活性炭.     

一种新型ePTFE覆膜滤料的实验研究

介绍了一种新开发的ePTFE覆膜滤料过滤阻力与分级除尘效率的实验测定结果。在过滤风速为0.5².5 m/s时,该覆膜滤料洁净滤料的阻力为272.5 m/s时,该覆膜滤料洁净滤料的阻力为27¹71 Pa;在过滤风速为1.2 m/min,其对PM2.5颗粒的净化效率达98%以上。     

流体动力式喷水室净化可吸入颗料物的研究

以水和含有可吸入颗粒物的空气作为研究对象,分析了纺织厂的喷水室中,风速和喷水压力对可吸入颗粒物≤2.5μm亚μm级粉尘除尘效率的影响.得出了风速以及喷水压力和除尘效率之间的规律.     

不同填料生物过滤去除H2S恶臭影响研究

生物过滤处理恶臭气体中大量存在的H2S.采用污水处理厂的活性污泥进行驯化和培养,以陶粒和活性炭作为填料,在停留时间为18.7～150s时,浓度为1.5×10-4、4.5×10-4、1.5×10-3时,去除效率均在99%以上.浓度大时,活性炭滤柱的作用效果要明显优于陶粒滤柱.反冲洗可以降低滤柱的压降,短时间内对去除效果有影响,但很快可以恢复.在滤柱的前段承担去除大部分H2S臭气.建议实际设计中可以采用多点进气方式或适当降低滤柱高度.填料的选择可以考虑加入适当比例的活性炭.     

上进风内滤式袋式除尘器的流场优化分析

研究一种上进风内滤式袋式除尘器,通过数值模拟分析改造除尘器的结构,以提高除尘器内部气流组织均匀性以及过滤效率。利用试验数据对仿真模型进行验证,并以流量分配系数、综合流量不均匀幅值、滤袋表面过滤风速为评价指标,对入口风速为5.0m/s时的袋式除尘器内部流场进行模拟分析。结果表明:当除尘器进、排气口异侧分布时,除尘器内部各滤袋的综合流量不均匀幅值较小,表面过滤风速较低,内部流场气流较均匀;当除尘器进、排气口同侧分布且在进气口增设导流板时,除尘器内部流场的气流均匀性以及各滤袋表面过滤风速的均匀性得到改善,能够提高除尘器的过滤效率,是一种较为合理的除尘器结构。     

长纤维过滤与石英砂过滤的性能对比试验

在深入了解纤维束过滤机理和总结现有各种纤维束过滤器优缺点的基础上,通过长纤维过滤与传统石英砂过滤的对比试验,详细论述了长纤维过滤较之石英砂过滤的技术特点与性能优势.试验结果表明:与传统石英砂过滤(滤速8~10m/h,过滤周期16~20h,出水浊度0.5NTU左右)相比,长纤维过滤最大滤速可达55m/h以上,各种滤速下过滤周期均大于50h,周期内出水浊度稳定在0.2NTU以下,且纳污量大,反冲洗彻底,运行稳定,展现了良好的应用前景.     

无机电解质对陶瓷膜表面电性质的影响

建立了测定了片状陶瓷膜的ξ电势的电渗实验装置，测定了不同无机盐溶液中氧化铝陶瓷微滤膜的ξ电势，基于表面化学原理初步分析了各类溶液组分对陶瓷膜表面电性质的影响，有关结果为深入理解无机盐对陶瓷膜微滤过程的影响提供了依据．     

增压流化床燃烧(PFBC)高灰煤的试验研究

本文介绍我所进行PFBC技术首阶段试验研究的情况,发表了五次试验的主要结果。燃用高灰煤时,燃烧效率可达97％～98％。对于中等含硫的煤,Ca/S比在1.5～1.8时,可达80％～85％的脱硫效率。燃气通过高温除尘系统后,含尘量为189mg/m~3(标),颗粒平均直径2.5～3μm,其中大于10μm的不超过3％。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to