Rapid determination of water in benzoyl peroxide by high frequency method

1973 ◽  
Vol 22 (11) ◽  
pp. 1440-1445
Author(s):  
Yuichi KAMURA ◽  
Sabro MIZUTANI ◽  
Keiko TOMIHISA ◽  
Masakazu SUGIYAMA
Keyword(s):  
Benzoyl Peroxide ◽  
High Frequency ◽  
Rapid Determination ◽  
Frequency Method

Very Early and Simple Determination of Chorionic and Amniotic Type in Twin Gestations by High-Frequency Transvaginal Ultrasonography

1997 ◽  
Vol 46 (3) ◽  
pp. 167-173 ◽  
Author(s):  
W. Malinowski
Keyword(s):  
Study Design ◽  
High Frequency ◽  
Twin Pregnancy ◽  
Rapid Determination ◽  
Early Stage ◽  
Transvaginal Ultrasonography ◽  
Pathologic Evaluation ◽  
Twin Pregnancies

AbstractObjective. The aim was to determine the chorionic and amniotic types in multifetal pregnancies with transvaginal ultrasonography at very early stage of gestation.Study design. Twenty-one spontaneous multifetal pregnancies were scanned transvaginally before 8 weeks' gestation (four of them from 4th week). The chorionic and amniotic type was determined ultrasonographically. All twin gestations had postpartum pathologic evaluation of the placenta and histologic determination of the chorionic and amniotic type.Results. Ultrasonographic evaluation of the 21 pregnancies demonstrated 20 twin and 1 triplet gestation. Four of the twin pregnancies were monochorionic-diamniotic. Triplet was monochorionic-triamniotic (spontaneously aborted in 8th week of gestation). In all 20 twin pregnancies, transvaginal ultrasonography correctly predicted the chorionic and amniotic type before 8 weeks of gestation.Conclusion. Transvaginal ultrasonography allows a reliable, simple and rapid determination; the dichorionic twin pregnancy in 4 weeks, monochorionic in 5 weeks, and differentiation of mono-or diamniotic in 7 weeks of gestation.

High Frequency (27.12 MHz) Activation of the Radical Curing of Unsaturated Polyesters in Styrene Solution

1996 ◽  
Vol 430 ◽  
Author(s):  
P. Alazard ◽  
A. Gourdenne
Keyword(s):  
Transition Temperature ◽  
Benzoyl Peroxide ◽  
High Frequency ◽  
Steel Plates ◽  
Crosslinking Reaction ◽  
High Frequencies ◽  
Unsaturated Polyesters ◽  
Radical Initiator ◽  
Electrical Voltage

AbstractThe crosslinking reaction of a divinylester resin of epoxy-acrylic type in styrene solution is activated by high frequencies at 27.12 MHz. The samples to be cured are positionned betweeen two parallel steel plates used as electrodes and an electrical voltage is applied. A parametrical study is described, where the applied electrical voltage, or power, and the concentration of benzoyl peroxide, which is the radical initiator, are taken into account. The optimization of the electromagnetic curing is performed through the determination of the glassy transition temperature of the final products.

Determination of Water in 1,1-Dimethylhydrazine and Hydrazine by High Frequency Method

1956 ◽  
Vol 28 (3) ◽  
pp. 329-332 ◽  
Author(s):  
R. D. Weaver ◽  
G. C. Whitnack ◽  
E. St. C. Gantz
Keyword(s):  
High Frequency ◽  
Frequency Method

scholarly journals Determination of multicomponent media permittivity by high-frequency method

2018 ◽  
Vol 194 ◽  
pp. 062004 ◽  
Author(s):  
O M Bolshunova ◽  
A A Korzhev ◽  
A M Vatlina ◽  
A M Kamyshyan
Keyword(s):  
High Frequency ◽  
Frequency Method ◽  
Multicomponent Media

Weak Beam Imaging and Diffraction Studies of Stacking Faults in Silicon

1976 ◽  
Vol 34 ◽  
pp. 590-591
Author(s):  
T. Y. Tan ◽  
W. K. Tice
Keyword(s):  
Fast Neutron ◽  
Rapid Determination ◽  
Stacking Faults ◽  
Imaging Method ◽  
Large Reduction ◽  
Dislocation Loops ◽  
Fringe Spacing ◽  
Weak Beam ◽  
Kinematical Theory

In studying ion implanted semiconductors and fast neutron irradiated metals, the need for characterizing small dislocation loops having diameters of a few hundred angstrom units usually arises. The weak beam imaging method is a powerful technique for analyzing these loops. Because of the large reduction in stacking fault (SF) fringe spacing at large sg, this method allows for a rapid determination of whether the loop is faulted, and, hence, whether it is a perfect or a Frank partial loop. This method was first used by Bicknell to image small faulted loops in boron implanted silicon. He explained the fringe spacing by kinematical theory, i.e., ≃l/(Sg) in the fault fringe in depth oscillation. The fault image contrast formation mechanism is, however, really more complicated.

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