摘要:

AbstractPurified, gel free butadiene‐styrene copolymers were prepared by emulsion polymerization with butadiene contents of 80, 55 and 30 weight %. Radiation behavior of these materials at 30°C was independent of dose rate in the range 0.04‐0.46 Mrad/hour and the scission‐crosslinking ratio was about 0.40 for all copolymers and was independent of total dose. Extrapolated sol fractions at infinite dose, intrinsic viscosities of irradiated polymers and Mnin the pre‐gel region gave mutually consistent estimates of this ratio. G(crosslink) was 3.4. At the relatively low doses studied, intra‐molecular crosslinking was evident only with the high styrene content polymer. Active sites for intermolecular crosslinking are thought to be allylic to chain double bonds, whereas vinyl groupings may be involved in intramolecular cr

ISSN:0008-4034    

DOI:10.1002/cjce.5450520112

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY

摘要:

AbstractTernary vapor compositions have been successfully calculated from total‐pressure measurements for four systems by means of a modified direct method, which involves the previously proposed concept of hypothetical binary mixtures, and permits the numerical integration using a simple P‐x relationship. The results of the systems tested further indicate that the ternary y values predicted from only binary P‐x data are not significantly different from the y values obtained when binary together with ternary P‐x values were used in the calculation, provided that the initial fit of binary P‐x data is s

ISSN:0008-4034    

DOI:10.1002/cjce.5450520113

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY

摘要:

AbstractRecent experimental studies of phase behavior in mixtures of light gases, at pressures up to ten thousand atmospheres, provide information about high pressure boundaries to regions of gas‐gas equilibrium. It is shown that these regions are generally bounded on the high pressure side by a three‐phase region of the type solid‐gas‐gas, which results from the solidification of the less volatile component. In some cases the gas‐gas phase separation terminates at a critical end point formed by an intersection of the critical line with the three‐phase region. However, the available evidence suggests that in other cases gas‐gas phase separations may persist to very high temperatures at very high pressures, perhaps even to the limits at which atomic and molecular structure begin

ISSN:0008-4034    

DOI:10.1002/cjce.5450520114

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY

摘要:

AbstractA useful procedure for the solution of time‐optimal control problems for linear systems is presented. The procedure consists of a direct search method for the determination of the best diagonal weighting matrix used in a Liapunov function for the system. The control policy chosen to minimize the forward difference of the Liapunov function yields very rapid approach to the origin.Numerical results are presented for a linear six‐plate gas absorber to show the feasibility of the proposed method. Even in the presence of disturbances the system can be taken to and kept at the vicinity of the ori

ISSN:0008-4034    

DOI:10.1002/cjce.5450520115

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY

摘要:

AbstractStatistical experimental design techniques for model discrimination are evaluated using data obtained by Juusola (1971) for the oxidation of o‐xylene over a vanadium oxide catalyst. The Box‐Hill (1967) design procedure for discrimination is found to be particularly sensitive to underestimation of the variance of the measured response. An analogous weighted criterion is developed and found to perform satisfactorily with data fitted using weighted least squares. Other numerical difficulties encountered in using the discrimination design criteria are also discus

ISSN:0008-4034    

DOI:10.1002/cjce.5450520116

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450520117

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450520118

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450520119

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY

摘要:

AbstractAn electronic controller is described which permits the automatic sequential mixing of two solutions. A small aliquot of each of the solutions produced is injected in turn into an electronic density meter displacing the previous solution and a digital recording is made of temperature and density. Results of a partial molal volume study of aqueous NaCl solutions at 25°C are presented (v_° = 16.621 cm3mol‐1, S*v= 1.848 cm311/2mol3/2, and bv= .0.138 cm31 mol

ISSN:0008-4034    

DOI:10.1002/cjce.5450520120

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450520121

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1974

数据来源: WILEY