“Retardion”除杂探讨

通过对萃取除杂和"Retardion"(阻滞)除杂工艺及其他除杂方法进行比较,论证了腈纶生产中采用"Retardion"除杂工艺除去 NaSCN 中的可溶性不挥发杂质,可达到高效、经济、便于操作.阐明了"Retardion"的除杂原理和树脂结构及吸附原理,对 NaSCN 法腈纶生产中溶剂的净化有一定指导意义.     

AN APPROACH TO THE DESCRIPTION OF THE EQUILIBRIUM OF LIQUID TWO-PHASE THREE-COMPONENT SYSTEMS.

An approach has been developed to describe the phase equilibrium in liquid two-phase three-component systems: polar organic solvent - water - salt ( Timmermans' systems ); polymer - water -salt; polymer (1) 7 water - polymer (2).

The corresponding relation has the form:

where: K is the distribution coefficient expressed as the ratio of concentration (in mole percent) of i-th component in the upper and lower phases;α_I is a constant accounting for the activity coefficients of i-th component in coexisting phases; k is a constant depending on the variation in the solubility of the i-th component in the presence of the j-th; Δc_j is the difference of concentrations of the j-th component in the lower and upper phases.     

“四缘”文化视域下的景德镇民窑生产

景德镇是移民城市,在千年陶瓷业生产历史中,来自＂四方八域＂的移民为景德镇陶瓷生产做出了重大贡献,成就了千年＂瓷都＂辉煌。在陶瓷生产中,来自各地的瓷业从业人员按照地缘、血缘、业缘、志缘结合起来,实现自身利益的最大化。     

一种浸渍沥青的应用

通常石墨电极的浸渍是用中温煤沥青做浸渍剂 ,由于煤沥青中富含喹啉不溶物（ＱＩ） ,直接影响浸渍效果 ,并为下工序出现废品埋下隐患。因此必须脱除其ＱＩ杂质 ,以使煤沥青浸渍剂在浸渍过程中能顺利地通过气孔浸润到石墨电极的内部去 ,达到最佳浸渍效果。本文主要讨论山东济宁煤化公司生产的首批浸渍剂与山东生建八三厂合作进行工业性浸渍试验的情况。１试验经分析成分后发现 ,喹啉不溶物（ＱＩ）的差异较大 ,中温煤沥青ＱＩ含量在７ %～１０ %范围内 ,浸渍剂中ＱＩ含量在０．６７ %～１．２６ %范围内。浸渍剂的质量指标如表１所示。先将浸…     

2007全国建筑陶瓷产业发展形势分析

2007年我国建筑陶瓷产业的形势发展基本上是2006年行业发展的一个延续,保持着持续增长,产销两旺,产品出口总量进一步增加,出现了前所未有的以扩张及再布局为内涵的行业大转移,节能减排对行业提出了新的挑战,技术创新、品牌建设、全面营销、进一步做大做强做精都是2007年我国建筑陶瓷行业的主旋律。     

AN INVESTIGATION OF THE VOLATILITY OF GLAZE CONSTITUENTS BY THE USE OF THE SPECTROGRAPH*

A procedure, developed for the study of volatile glaze constituents, consists of heating the glazes beneath an absorbing medium which is subsequently tested by the spectrograph for the volatilizable constituents evolved. Data are presented showing temperatures at which certain important glaze constituents begin to volatilize, the order in which they leave the parent glaze, the influence of glaze composition on the volatilization temperature of each volatilizable constituent, and the effect of heat treatment on the volatilization temperatures.     

ON THE ASYMPTOTIC EFFICIENCY OF ESTIMATORS OF THE PARAMETERS OF AN ARMA PROCESS

Abstract. In this paper we derive a lower bound on the asymptotic covariance matrix of an estimator of the parameters of an autoregressive moving average (ARMA) process when the innovations are not necessarily Gaussian.     

AN EVALUATION OF THE GAUTAM-MUTHARASAN CONTROL ALGORITHM

This work experimentally verified and evaluated a relatively new direct-digital control algorithm by Gautam and Mutharasan (G-M) which was designed to perform equally well for load and for set-point changes and to accommodate shifting process parameters. The algorithm was compared to a Datilin controller and a discrete P-I law for temperature control on a steam-water heat exchanger, operating each algorithm in cascade with a Dahlin steam-flowrate controller. Based upon integral criteria, the G-M algorithm showed marked improvement over the other two, especially for load disturbances affecting process parameters. However, ringing was found to be a problem     

外加盐反离子对一种阴离子菁染料的J-聚集效应

研究了室温下外加盐反离子对一种阴离子菁染料在稀水溶液的J-聚集体形成的效应。吸收光谱表明反离子未并入平面菁离子自身的堆叠体内,而应是以电性关系“束缚”于其外。电化学法测定染料溶液中反离子活度的结果表明,菁离子堆叠体与“束缚”于其外的简单金属反离子之间接近于以电价关系相维系。吸收光谱还表明,分别加入所选用的几种简单盐反离子时,它们引起在同浓度染料Ⅰ稀溶液中产生J-聚集体的最低浓度主要受反离子电荷的,控制,反离子本性的影响不明显;高价反离子对于引发生J-聚集体特别有效。     

AN ANALYSIS OF THE EIGENVALUES OF BUBBLY TWO-PHASE FLOWS

The eigenvalues and Riemann invariants of a typical two-fluid model of bubbly two-phase flow are analyzed. An analytical procedure for converting this system of conservation equations from Lagrangian to Eulerian (i.e., conservation) form is presented. It is shown that void waves may exhibit both shocks and rarefactions. Moreover, the dependence of the eigenvalues on closure assumptions is demonstrated.     

论清康熙官窑瓷“仿明风”形成的条件与原因

清康熙中期时,御窑厂得到正式复兴。仿明是康熙官窑最鲜明的特色之一,从颜色釉至各类彩绘瓷均有显著的"仿明风"。康熙官窑"仿明风"是在各方面有利条件下形成的,其形成与当时政治与文化风气密切关联。     

A SIMPLE DERIVATION OF THE CUTPOINT OF AN IMPACTOR

Impactors are designed according to numerical computations, which have been shown to give accurate predictions for the 50% cutpoint. However, such computer calculations obscure the basic physics of the impactor. Textbook derivations commonly assume circular streamlines and do not yield accurate results for the cutpoint. In this paper, a simple but accurate derivation is given for the cutpoint of an impactor with a rectangular nozzle, based on only very general assumptions as to the flow. For an impactor with a circular nozzle, the derivation requires an additional input datum and is less accurate. The derivation makes clear the essential physics of the impactor.     

AN EVALUATION OF THE GAUTAM-MUTHARASAN CONTROL ALGORITHM

This work experimentally verified and evaluated a relatively new direct-digital control algorithm by Gautam and Mutharasan (G-M) which was designed to perform equally well for load and for set-point changes and to accommodate shifting process parameters. The algorithm was compared to a Datilin controller and a discrete P-I law for temperature control on a steam-water heat exchanger, operating each algorithm in cascade with a Dahlin steam-flowrate controller. Based upon integral criteria, the G-M algorithm showed marked improvement over the other two, especially for load disturbances affecting process parameters. However, ringing was found to be a problem     

THE MODULUS OF ELASTICITY AS AN INDICATION OF THE UNIFORMITY OF ELECTRICAL PORCELAIN1

An electrical porcelain body of the composition 30% H and G A1 china clay, 20% Dorset English ball clay, 20% Ottawa flint, and 30% Buckingham feldspar, fired to cone 11. showed a modulus of elasticity of 9.54 ± 0.02 × 10⁶ 1b. per sq. in. (mean of 164 measurements). A similar body with Kentucky special ball clay substituted for Dorset hall clay gave a value of 10.01 ± 0.02 × 10⁶ 1b. per sq. in. (mean of 69 measurements) The accuracy of the measurements was ± 1.5%. The use of the modulus as a measure on. the uniformity of electrical porcelain gave excellent results The variations were expressed in terms of statistical constants such ac: the standard deviation and the coefficient of variability.     

Cu-,Mg-蒙脱石层间吸附水的研究

通过现场红外分析研究了Mg-、Cu-蒙脱石在真空加热体系中脱水过程的红外光谱。发现荥脱石层间有三种吸附水,即“牢固键合水”、“松散键合水”和“自由水”。前两种键合水具有相同的取向结构,但吸附能上有差别。层间吸附水的稳定性与层间阳离子属性有关。Mg-蒙脱石层问水比Cu-蒙脱石层间水稳定,在吸附能上,Mg-蒙脱石层间“自由水”高于或接近Cu-蒙脱石层间的“松散键合水”。     

满族枕头顶

17世纪初叶，心灵手巧的满族少女兴起了一股绣枕头顶的民风：用五彩的丝线，在红、黄、蓝、自四种象征八旗的基本颜色的绸缎上，按照事先设计好的图案精心地绣制……如今，枕头顶已从满族姑娘的婚礼中退出而成为文物。