多聚甲醛/二甲基亚砜人造纤维的结构与性能

本文全面地分析了PF/DMSO体系纺制的纤维的结构与性能。发现该种纤维具有结晶度高,取问度高及易原纤化,且原纤的排列方向与纤维轴平行等特点,导致该纤维具有高模量、强耐碱性和较低延伸度,较低勾强等特性。本研究同时探讨了不同凝固浴纺出的纤维结构及性能的差异。初步试验表明,H_2O—NH_3—DMSO凝固休系纺制的纤维的结晶度,结晶尺寸有所降低,纤维的延伸度和勾强相应提高,值得进一步研究和探讨。     

混合溶剂中AgCl、AgBrO_3溶度积的SPT计算

以AgCl.AgBrO_2在一系列浓度的MeOH—H_2O,EtOH—H_2O,n—PrOH—H_2O,Me_2CO—H_2O及DMSO—H_2O混合溶剂中的离解平衡为研究对象,用定标粒子理论计算了这些难溶盐的浓度积,计算结果与文献值吻合很好。     

混和溶剂的性质对Fe~2与trans-[CoCl_2(NH_3)_4]反应机理的影响

在H_2O—DMF(二甲基甲酰胺),H_2O—HMPA(六甲基磷酰三氨),H_2O—THF(四氢呋喃),H_2O—1.4Dioxane(1.4二氧六坏)和H_2O—DMSO(二甲亚矾)等混合溶剂中,trans—[CoCl_2(NH_3)_4]~+和Fe~(2+)还原反应,在15—35℃范围造行研究,实验表明:X_(DMSO)=0.3,X_(DMF)=0.25,X_(HMPA)=0.14,XD_(Di)=0.12时,反应速度有明显变化。在H_2O—DMSO混和溶剂中进行Fe与tfans—(CoCl_2(NH_)_4)~+反应时,已经显现出了溶剂会合体对被研究反应动力学性质的显着影响。本文的目的是:在可能形成溶剂会合体的更多混合溶剂中,进行上述同一被研究反应,在更大范围内探讨溶剂会合体,混合溶剂中非水溶剂组分和反应物离子的溶剂化作用等对被研究反应动力学性质的影响。被研究反应: Fe~++trans—[CoCl_2(NH_3)_4)~++4H~+—→Fe~(3+)+Co~(2+)+2Cl~-+4NH_4~+ 所选用溶剂: DMF—H_2O,HMPA—H_2O,THF—H_2O,Dioxane—H_2O     

开链聚醚配体及其镧系锕系配合物的合成与表征

用1,4—二(2′—甲酰基苯基)—1,4-二氧杂丁烷和1,7—二(2′—甲酰基苯基)—1,4,7—三氧杂庚烷,在相转移催化剂存在下,用 KMnO_4氧化,制得了两种键端为羧酸的开链聚醚配体:2,2′—(1,4—亚乙二氧基)—二苯甲酸(H_2L~1)和2,2′—(1,7—二乙醚二氧基)—二苯甲酸(H_2L~2)。用元素分析,红外光谱对它们进行了表征。在甲醇或水介质中,制得了 H_2L~1和 H_2L~2的镧系元素固体配合物,通式分别为 LnL~1(NO_2)·nH_2O 和 Ln_2L(_3~2)·nH_2O(Ln=La—Lu,Pm 除外);在甲醇介质中还制得了它们的 UO(_2~(2+))和 Th~(4+)配合物,UO_2L~1·6H_2O,UO_2L~2·3H_2O,ThL(~1_2)·H_2O 和 ThL(~2_2)·5H_2O。     

青海湖盐水氯镁石(MgCl_2·6H_2O)的热分析研究

本文用热分析方法,对青海湖盐下氯镁石(MgCl_2·6H_2O)的热分解反应进行了TG、DTG、DTA、DSC的测定,配合分解气的化学分析、气相色谱分析和固体物的红外光谱分析,解释了DTA曲线,初步推断了MgCl_2·6H_2O热分解的机理。 MgCl_2·6H_2O 118℃—→熔融 MgCl_2·6H_2O 156℃—→MgCl_2·4H_2O 2H_2O MgCl_2·4H_2O 191℃—→MgCl_2·2H_2O 2H_2O MgCl_2·2H_2O 200℃—→MgCl_2·H_2O H_2O MgCl_2·H_2O 251℃—→MgOHCl HCl MgOHCl 461℃—→MgO HCl总失重率为78.5％。用Kissinger法测得MgCl_2·6H_2O→MgCl_2·4H_2O 2H_2O的表观活化能为30.4KCal/mol。MgOHCl→MgO HCl表观活化能为49.7KCal/mol。测定热分解反应的热效应为97.2KCal/mol。     

摩擦纺纱中一种纤维分梳和输送装置的试验和分析

本文分析了目前粗支纱摩擦纺机和细支纱摩擦纺机的特点。作者设计了一种纤维分梳和输送形式。试验表明,该形式适纺支数范围较宽(148—18.5tex),能以1—2根条子喂入,纺制纯棉纱和各种纤维的混纺纱;可纺制内外层的纤维组分不一样的夹花纱;在安装附加装置后也可纺制包芯纱和花色纱。该装置机构简单,占地面积小,可供设计中、粗支纱摩擦纺纱机时参考。     

Na_2CO_3—Na_2C_2O_4—H_2O 体系的溶解度(25°)

1.Na_2CO_3—Na_2C_2O_4—H_2O 体系在25℃时是一个简单共饱和类型的体系,它的二个固相是:Na_2CO_3·10H_2O 和 Na_2C_2O_4,双饱和点的液相组成为:Na_2CO_3 17.50％,Na_2C_2O_40.945％,H_2O 81.53％。2.考察了 Na_2CO_3—Na_2C_2O—H_2O 体系中水相总饱和度,发现在双饱和时水相的总饱和度最大。3.比较了 Na_2CO_3—Na_2C_2O_4—H_2O 和 Na_2SO_4—Na_2C_2O_4—H_2O 二个三元体系,发现这二个体系有极大的相似点。     

甲烷在镍催化剂上转化的反应动力学

为了制取氢和合成气,烃类的催化反应动力学,到目前为止,研究得还是很不够的。在常压下,使用由氧化铬活化过的镍催化剂(以2—3毫米的耐火粘土块作为载体),以流动法,对反应速度(CH_4:H_2O=1:1-1:3)进行了研究(温度范围为400～700℃,接触时间为0.008～0.06秒)。对于总的反应,提出下列动力学方程式:ω=K(P_(CH_4)P_(H_2O))/(10P_(H_2) P_(H_2O)) (11—6)式中:ω—反应速度,毫米汞柱/秒K—反应速度常数P_(CH_4),P_(H_2O),P_(H_2)—相应组份的分压,毫米汞柱     

静电纺二醋酯纳米纤维的热性能研究

以二醋酸纤维素为原料,通过大量尝试性试验,找到了两种较理想的溶剂体系,即以单独丙酮为溶剂和以丙酮/二甲基乙酰胺(DMAC)混合溶液作溶剂,成功制备了静电纺二醋酯纳米纤维.通过热重(TG)法和差示扫描量热(DSC)法,对比分析两种溶剂体系下制得的纳米纤维与原材料在热性能上的差异.研究发现:静电纺二醋酯纳米纤维的热稳定性较原二醋酸纤维素差,且以丙酮/DMAC混合溶液作溶剂纺得的纳米纤维的热性能变化更显著.     

转杯纺纯棉竹节纱的工艺探讨

通过在BD200SN转杯纺纱机上加装伺服驱动自控系统,控制纤维喂入量来改变牵伸倍数的方式实现纺制转杯纺纯棉竹节纱.通过工艺实验,分析了纤维性能、纺纱工艺等因素对转杯纺纯棉竹节纱质量的影响,探讨了生产转杯纺纯棉竹节纱的工艺措施,纺制了符合质量要求的转杯纯棉竹节纱.     

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-