新型多孔保温材料的制备及性能

基于微尺度传热传质机理,以膨胀珍珠岩为骨料,水玻璃为粘接剂,煅烧高岭土、碳酸钙、锂基膨润土等为添加剂,通过微波加热膨化,制备了一种硬质多孔保温材料,研究了加热膨化方式对所制备的保温材料性能的影响,并探讨了不同原料组成时导热系数的变化规律.结果表明,膨胀珍珠岩/水玻璃/锂基膨润土/煅烧高岭土/CaCO3的最佳质量配比为46∶36∶13∶3∶2,膨胀珍珠岩和水玻璃的含量是影响保温材料导热系数的主要因素,锂基膨润土、煅烧高岭土和碳酸钙等添加剂可有效地增强保温材料的机械强度和耐水性.     

膨胀珍珠岩的纳米气凝胶改性及其应用

膨胀珍珠岩作为建筑保温材料在应用中易碎裂、吸水率大,保温性能下降严重。为克服这个缺陷,研究制备憎水气凝胶,然后用其对膨胀珍珠岩进行改性,复合得到纳米改性膨胀珍珠岩保温骨料,并探讨其在保温砂浆中应用。采用水玻璃为硅源,用三甲基氯硅烷(TMCS)/乙醇(Et OH)/正己烷(C_6H_(14))(摩尔比3∶2∶2)混合液对水凝胶进行溶剂置换和表面改性,当混合液中TMCS和水凝胶中的H_2O的摩尔比为0.14时,得到憎水性良好气凝胶。在研究得到的最佳相对真空度-0.04 MPa下,真空吸入液溶胶,将憎水气凝胶和珍珠岩掺和到一起,得到具有良好憎水性能气凝胶改性膨胀珍珠岩,其导热系数为0.034 7 W/(m·K),筒压强度为208.64 MPa,其中气凝胶的质量比为39.30%,综合性能明显优于膨胀珍珠岩。用该骨料制备的保温砂浆基本性能良好,抗压强度0.38 MPa,导热系数0.056 W/(m·K),吸水率为32%;其抗压强度和吸水率明显优于珍珠岩砂浆,导热系数优于玻化微珠保温砂浆。     

保温隔热瓦及其制作方法

目前用的保温材料有传统保温材料和新型保温材料两种。传统保温材料有石棉、蛭石、硅藻土、膨胀珍珠岩、矿棉及其制品。其缺点是容重大,导热系数高,抗压强度较低;新型保温材料多为膏体如无机复合绝热材料,它是以粉煤     

复合相变储能砂浆的制备及其性能研究

以工业石蜡为相变芯材,通过真空吸附法和硅酸钙外壳封装法制备石蜡/膨胀珍珠岩复合相变材料和复合相变储能砂浆.利用SEM和差示扫描量热法分析了石蜡/膨胀珍珠岩相变材料的形貌和蓄热能力,测试了复合相变储能砂浆的抗压强度、干表观密度、导热系数和三维条件下材料温度时间响应关系.结果表明,经硅酸钙外壳封装后石蜡/膨胀珍珠岩相变材料中石蜡的含量约为55.47%时,相变温度和相变潜热分别为35.59℃和96.77J/g;复合相变储能砂浆的28d抗压强度,干表观密度和导热系数分别为8.0MPa,1 678kg/m~3和0.46W·m~(-1)·K~(-1),在外界温度变化时,复合相变储能砂浆相对于传统砂浆材料具有升温和降温速度变化平缓,可用作保温砂浆.     

膨胀珍珠岩掺量对EPS泡沫混凝土性能的影响

为了解决建筑制冷、保暖所产生的建筑能源损耗问题,本文设计了一种新型、绿色、轻质、高强自保温泡沫混凝土砌块,即将聚苯乙烯(EPS)颗粒和膨胀珍珠岩颗粒这2种隔热轻质骨料与泡沫混凝土混合制成一种新型复合泡沫混凝土,并通过测试该复合混凝土的干密度、抗压强度、孔隙率、吸水率、导热系数、含水率和燃烧质量损失率,探讨膨胀珍珠岩掺量对复合泡沫混凝土性能的影响﹒研究结果表明：一定掺量膨胀珍珠岩能增加EPS泡沫混凝土的抗压强度,降低导热系数和燃烧质量损失率,且当膨胀珍珠岩掺量为12%时,其抗压强度最高为1.66 MPa;当膨胀珍珠岩掺量为21%时,其导热系数最低为0.133 W/(m·K);当膨胀珍珠岩掺量为18%时,其燃烧质量损失率最低为4.2%;当膨胀珍珠岩掺量为6%时,该配比满足A6等级,其干密度、导热系数和抗压强度等级达到C1,吸水率等级达到W10,燃烧性能等级达到A级不燃﹒     

膨胀珍珠岩保温材料的制备与性能

目的研究膨胀珍珠岩保温材料的制备工艺,解决传统珍珠岩保温材料吸水严重等问题.方法以膨胀珍珠岩为主要原料,添加无机-有机胶黏剂,用40 mm×40 mm×120 mm模具在SVC-4500VA压力机上模压成型,在干燥设备内烘干制得试样.测试其导热系数、抗压强度、憎水率等性能,初步探索制作工艺.结果试验表明在胶黏剂掺量为7%~10%,成型压力为0.36 MPa时,试样的导热系数为0.058 W/(m·K),抗压强度为0.4 MPa,憎水率为98%,防火等级为A级,符合GB/T 5464-2010/ISO 1182:2002中的规定.结论胶黏剂的掺量是制备试样强度的主要因素,随着胶黏剂掺量的增加,试样的强度和导热系数均逐渐增加;随着胶黏剂中有机组分的增加,试样的憎水率逐渐提高;在一定范围内,试样的导热系数随着成型压力的增加而降低,当超过某一阈值时,随压力的增加而增大.     

珍珠岩低温碱发泡轻质材料的制备及其性能

以珍珠岩为原料,NaOH为活化剂,经低温处理制备出一种轻质高强的发泡材料。通过单因素方法探究碱的浓度、焙烧温度、升温速率以及保温时间对发泡材料表观密度、导热系数和抗压强度等性能的影响,采用X-射线衍射和扫描电镜对试样进行物相分析和显微结构表征。结果表明:NaOH浓度为12mol/L、3℃/min的升温速率,在450℃焙烧3h时,制备发泡材料性能较优;表观密度为0.476g/cm~3,导热系数为0.062W/(m·K),抗压强度为6.321MPa.     

赤泥保温材料烧结过程中液相形成温度与分解型发泡剂分解温度匹配研究

为了获得烧结法制备保温材料发泡剂的选择依据,为高温烧结法制备保温材料提供可利用的规律,以山西某公司提供的赤泥为主要原料,通过双氧水室温发泡和高温发泡剂在煅烧过程中的二次发泡,制备赤泥基保温材料。通过选用发泡温度不同的高温发泡剂、加入影响赤泥保温材料液相形成温度的无定型SiO₂和陶瓷抛光废料调节保温材料烧结过程中液相形成温度,研究烧结过程中组织组成变化、保温材料导热系数、吸水率和抗压强度,探讨保温材料制备过程中液相形成温度与高温发泡剂的发泡温度间的匹配关系。结果表明高温发泡剂分解温度应该在基体软化温度以上,两个温度越接近,形成的材料导热系数越低。优化条件下高温发泡剂保温材料的导热系数为0.283 2 W/(m·K),抗压强度为6.79 MPa。     

上海技术交易所

粉煤灰发泡轻质 建筑材料 粉煤灰是电厂的废料,目前已大量应用于建筑制砖,而被用来制作发泡轻质建材尚未见有报导。经科技人员多年研究,现已研制开发成轻质建材。其特点是抗折强度高,自重轻,导热系数好于膨胀珍珠岩,隔音效果好。其具体检测数据为:密度:410kg/m~3;导热系数(平     

胶粉对聚苯颗粒砂浆性能的影响

目的研究掺加不同类型可再分散乳胶粉和掺量对聚苯颗粒保温砂浆力学性能、干密度、导热系数及软化系数的影响.方法采用水灰质量比为0.6,水泥与粉煤灰质量比为7∶3,胶体材料与聚苯颗粒体积比为1∶6,分析通过改变胶粉类型及控制掺量,聚苯颗粒保温砂浆的各项性能.结果在掺量为2%时,胶粉O、P、M的掺入与控制样本(未掺加胶粉)相比抗压强度值分别提高了36.25%、128.75%和175.31%,抗折强度分别提高了50%、61.25%、77.50%,拉伸粘结强度均超过了0.05 MPa.材料的保温性能和耐久性在掺量达到4%时,达到理想效果.结论胶粉的掺入均能不同程度的改善聚苯颗粒保温砂浆材料的力学性能、保温性能及耐久性能;普通胶粉(胶粉O)在低掺量(掺量低于2%)情况下,对聚苯颗粒保温材料抗压强度改善效果较为不明显,但对聚苯颗粒保温材料抗折强度却有很大程度的提高;胶粉的掺入会影响聚苯颗粒保温材料内部开口孔和闭合孔形成的数目比例的变化,进而影响聚苯颗粒保温砂浆保温性及耐久性.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-