There was no difference in frequency of maturation of oocytes obtained from mice hypophysectomized for 2 weeks compared to those from sham-operated or untreated (control) animals of the same age. By 7 weeks, and also at 12 and 17 weeks, the incidence of polar body formation in vitro was significantly reduced. The number of oocytes which remained meiotically inactive in culture was increased at ...

Pregnant mare's serum (pms) is being used by various workers for inducing ovulation in the immature rat (Cole, 1936; Williams, 1945; Zarrow, Caldwell, Hafez & Pincus, 1958; Strauss & Meyer, 1962; McCormack & Meyer, 1962). This report is concerned with the comparison of pmsg preparations manufactured by three different companies as regards their ability to cause ovarian growth and ovulation in t...

In a high proportion of new energy grids or 100% source power grid, the dynamic performance PMSG under fault conditions is very important. However, current small signal model lacks detailed and deep analysis permanent-magnet synchronous generator (PMSG)-based wind generation LVRT control. Here, pre-fault, after failure recovery stages are established. This paper employs linear analyses to chara...

Ucar O. , M. Kaya, S. Yildiz , F. Onder , M. Cenesiz , M. Uzun: Effect of Progestagen/PMSG Treatment for Oestrus Synchronization of Tuj Ewes to be Bred after the Natural Breeding Season. Acta Vet. Brno 74, 2005: 385-393. The aim of this study was to investigate the effect of pregnant mare serum gonadotrophin (PMSG) and progestagen sponge on oestrus synchronization of Tuj ewes mated after breedi...

In order to analysis the small signal stability of direct-drive permanent magnetic synchronous generator (PMSG) based wind farm, this paper makes a model windfarm including detailed PMSG adopting component connection method (CCM). process, system, consist turbine units with PMSG, collection cable, feeder, transmission cable and grid side, is divided into several subsystems. The interconnection ...

To research the chaotic motion problem of direct-drive permanent magnet synchronous generator (D-PMSG) for a wind turbine with uncertain parameters and fractional order characteristics, control strategy established upon fuzzy state feedback is proposed. Firstly, according to working mechanism D-PMSG, Lorenz nonlinear mathematical model by affine transformation time transformation. Secondly, sys...

This chapter deals with a comprehensive overview study of the direct‐driven (DD) permanent magnet synchronous generator (PMSG) for wind‐energy generation system for stand‐alone applications. The dynamic model of PMSG is presented, and different maximum power point tracking (MPPT) algorithms have been realized in the aim to compare their performance. A comparison of performances of the conventio...

The aim of our study was to investigate the efficacy of exogenous gonadotrophin to induce puberty and pregnancy in prepubertal gilts which had reach the weight of fully grown pigs. The animals used in the study included 195 crossbreed German Landrace gilts aged between 150-180 days old, weighing between 75-90 kg and 24 crossbreed German Landrace adult male pigs. The prepubertal gilts of Group I...