用碱矿渣胶凝材料粘贴FRP布加固混凝土结构的剪切性能

为解决环氧类有机胶耐火性差的问题,选择工业副产品粒化高炉矿渣为原料,水玻璃为碱性激活剂,制备了一种用于FRP加固混凝土结构的耐高温无机胶——碱矿渣胶凝材料.通过考察水玻璃模数与用量,以及水用量对胶块抗压强度的影响,优选出碱矿渣胶凝材料的最佳配比为:水玻璃模数Ms=1.0,水玻璃用量为矿渣粉质量的12％,水用量为矿渣粉质量的42％.通过面内剪切试验,研究了FRP布和胶黏剂类型对FRP布与混凝土基材的界面剪切性能的影响,建议了2种CFRP布的有效黏结长度为160和220 mm.试验结果表明:碱矿渣胶凝材料用于粘贴CFRP布加固混凝土结构效果良好,其面内剪切强度与有机胶相当,界面破坏呈现胶层下混凝土大面积剥离的理想破坏模式.     

碱-偏高岭土胶凝材料的凝结硬化性能研究

对碱 偏高岭土胶凝材料的凝结硬化性能进行了研究.研究方法是将碱激发剂∶偏高岭土∶砂=0.7∶1∶1(质量比)混合并成型为3cm×3cm×3cm的试块,在规定的条件下养护到规定的时间,根据试块的抗压强度来评价凝结硬化性能.试验结果表明:碱 偏高岭土胶凝材料的胶砂强度随碱的浓度增加而加快;随养护温度升高和养护时间延长而加快;与水玻璃的模数有关.当水玻璃模数为0.75～1时,胶砂强度发展速率迅速;当水玻璃模数≥2时,砂浆在80℃养护24h不能脱模;当水玻璃模数为0.5时,砂浆拌合时发生闪凝.由此可以推断:当水玻璃模数为0.75～1时,水玻璃中SiO2初始状态有利于反应产物的形成以及(或者)偏高岭土在该水玻璃的碱浓度中的溶解度可能与反应物的形成速度相匹配.     

从粉煤灰中提取氧化铝熟料溶出过程工艺研究

对粉煤灰和石灰石烧成的熟料在碳酸钠溶液中的溶出过程进行研究,探讨碳酸钠用量、溶出温度、溶出时间及液固比等工艺条件对熟料溶出中Al2O3和SiO2溶出效果的影响。研究结果表明:在碳酸钠用量约为理论量的1.0倍,溶出温度为50～60℃,保温时间为40～60 min,液固比为3～4的条件下,熟料中Al2O3的溶出率大于82%,溶出液中Al2O3质量浓度约为36 g/L,溶液的硅量指数铝、硅质量比大于46;溶出产生的钙硅渣成分及其质量分数为:Al2O3 2.60%,SiO2 24.31%,CaO 58.40%,Fe2O3 1.79%,TiO2。0.49%,Na2O 0.53%;熟料的主要物相为γ-2CaO.SiO2和CaCO3。     

聚合硫酸铁铝硅混凝剂的制备及其性能

研究以硫铁矿烧渣、铝酸钙粉、水玻璃、硫酸为原料，通过酸溶、中和、聚合过程，制备新型复合混凝剂——聚合硫酸铁铝硅(PFASS)的方法．考察了制备工艺对产品稳定性的影响，并对其混凝性能进行了研究．试验结果表明，当Fe^3 Al^3 的摩尔浓度为2．4mol／L、Fe^3 Al^3 ／SiO2摩尔比为10时，产品会有较好的贮存稳定性(即产品保持良好的流动性，无胶凝现象)．聚合硫酸铁铝硅与聚合硫酸铁(PFS)的混凝对比结果表明，PFASS具有更优的混凝除浊性能，具有较宽的pH适用范围．     

响应曲面法优化土聚水泥的制备研究

该文以煤系高岭土和碱激发剂水玻璃为原料,煅烧温度、水玻璃模数和掺量为3个试验因素,以凝结时间、强度和收缩值为响应值,利用响应曲面法进行设计3因素3水平试验,通过对回归方程分析探讨制备性能优异的土聚水泥的最优条件参数。研究结果表明,土聚水泥的最佳制备参数为:偏高岭土煅烧温度约为850℃,水玻璃模数为1.1,水玻璃掺量介于19%～20%之间。     

珍珠岩高温碱溶制取水玻璃

将珍珠岩与NaOH混合进行高温碱溶，结果表明：珍珠岩与NaOH的质量比为1.00:0.75,在550℃灼烧1h，可使珍珠岩的化学有效成价SiO2溶出率达83％以上，溶出液可做工业用水玻璃，经分析质量达到国家标准。     

铝灰渣高效利用的试验研究

以废铝灰渣为原料利用碱酸碱法制备聚合氯化铝,探讨加热温度、混合物配比、保温时间对固相热分解阶段的影响,以铝灰溶出率为指标探索酸溶及碱溶的最佳工艺.对处理后的残渣进行XRD图谱分析,以确定残渣的主要成分.且通过Al-Ferron逐时络合比色法对所制备的聚合氯化铝溶液中铝水解形态进行分析.研究结果表明:经碱酸碱处理后铝灰的溶出率高达95.94%,由此可合成高浓度(0.53 mol/L)高Alb(85%)含量的PAC溶液.且铝灰经此工艺处理后剩余残渣量少,主要成分为α-Al2O3.     

两段烧结工艺中的Ⅰ段赤泥烧结

研究了铝土矿两段烧结工艺的Ⅱ段烧结及溶出的最佳操作条件，确定Ⅰ段赤泥在钙比为２３５，烧结温度为１１２０～１２００℃时，氧化钠溶出率达９２％左右，氧化铝溶出率达８１％左右；当溶出液氧化铝质量浓度为４０～８０ｇ／Ｌ时，Ⅱ段熟料溶出的二次反应很弱，溶出条件宽松．因此，两段烧结新工艺处理铝硅比为６的矿石，氧化钠总溶出率达９８６％，氧化铝总溶出率达９６８％，碱的化学损失是每吨氧化铝损失碳酸钠１８ｋｇ．     

综合加权评分法优化麦糟不溶性膳食纤维分离工艺

优化化学法制备麦糟不溶性膳食纤维的碱溶工艺条件.通过单因素和正交试验,考察NaOH浓度、碱溶温度和碱溶时间对不溶性膳食纤维得率和不溶性膳食纤维中杂质含量的影响,分析因素的主次顺序和显著性,优化工艺条件.结果表明,在NaOH浓度0.375 moL/L,碱溶温度60℃,碱溶时间70 min条件下,制备得到麦糟不溶性膳食纤维的质量较高,验证试验不溶性膳食纤维得率为35.36%,不溶性膳食纤维中蛋白质质量分数为4.96%,综合评分为75.48,与正交试验结果75.57相差0.12%,结果可行.     

中低品位贵州铝土矿石灰拜尔法溶出工艺

采用铝硅比为5.48的贵州中低品位一水硬铝石型铝土矿进行石灰拜尔法溶出实验,系统地研究石灰添加量、母液苛碱质量浓度和溶出温度等因素对溶出过程的影响。研究结果表明:随着石灰添加量的增大,溶出赤泥铝硅比和钠硅比均呈明显的下降趋势,增大石灰添加量对降低碱耗效果十分明显。贵州中低品位铝土矿石灰拜尔法适宜的溶出条件如下:石灰添加量为10%,配料分子比为1.45,循环母液苛碱质量浓度为200 g/L左右,溶出温度为270℃左右,溶出时间50 min,在此溶出条件下,溶出液苛性比1.40,赤泥铝硅比1.20,钠硅比0.38,氧化铝相对溶出率95%。     

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.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that