منابع مشابه
Magnetron Frequency Twinning
Pulsed magnetron oscillators sometimes show an instability known as “twinning” in which the spectrum shows two, or more, closely spaced peaks. This phenomenon is undesirable and can lead to problems when it occurs in magnetrons used in radars. An experimental investigation of twinning is described from which conclusions are drawn about the design parameters that affect it. It has been shown tha...
متن کاملEffect of unilateral ovariectomy on twinning frequency in the marmoset.
The marmosets, small New World primates of the family Callithricidae, were reported by Wislocki (1939) to have a high frequency of fraternal twinning. On the basis of information obtained from an examination of nineteen pregnant specimens and observations on an additional twenty-one cases reported by others, Wislocki (1939) calculated an 87\m=.\5%incidence of twinning. Breeding data obtained in...
متن کاملHuman zona pellucida micromanipulation and monozygotic twinning frequency after IVF.
To assess the association of zona pellucida micromanipulation and subsequent development of monozygotic twins, cases of assisted embryo hatching (AH) and intracytoplasmic sperm injection (ICSI) were identified and related to treatment type, implantation and zygosity data. Embryology records from all patients undergoing in-vitro fertilization (IVF) at this centre from January 1995 to March 1998 ...
متن کاملDizygotic twinning.
The tendency to conceive spontaneous dizygotic (DZ) twins is a complex trait with important contributions from both environmental factors and genetic disposition. Twins are relatively common and occur on average 13 times per 1000 maternities, though the twinning frequency varies over time and geographic location. This variation is mostly attributed to the differences in DZ twinning rate, since ...
متن کاملTwinning in cattle.
INTRODUCTION The biological efficiency of traditional systems of beef production is low due to the low reproductive rate and the high proportion of total energy which is required for maintenance of the breeding herd. Dickerson (1978) estimated that 56% of the total feed energy intake for adult and market cattle is required solely for body maintenance (the non-productive energy requirement rises...
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ژورنال
عنوان ژورنال: IEEE Transactions on Plasma Science
سال: 2000
ISSN: 0093-3813
DOI: 10.1109/27.887748