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We analyze the existence of equilibrium points for a particle or dust grain in the framework of unperturbed and perturbed Robe's motion. This particle is moving in a spherical nebula consisting of a homogeneous incompressible fluid, which is considered as the primary body. The second primary body creates the modified Newtonian potential. The perturbed mean motion and equations of motion are found. The equilibrium points (i.e. collinear, noncollinear and out–of–plane points), along with the required conditions of their existence are also analyzed. We emphasize that this analysis can be used to study the oscillations of the Earth's core under the attraction of the Moon and it is also applicable to study the motion of underwater vehicles. [ABSTRACT FROM AUTHOR]

Several cases of concrete deterioration involving sulfide-bearing aggregates have been reported over the years. However, no specific guidelines are currently available to enable making a precise decision on the deleterious potential of aggregates containing iron sulfide minerals. The aim of this paper is to provide an innovative assessment protocol to evaluate the potential deleterious effects of iron-sulfide-bearing aggregates prior to their use in concrete. The findings of this paper are based on tests developed within the past few years as part of a major research project. The protocol is divided into three major phases: 1) total sulfur content measurement; 2) oxygen consumption evaluation; and 3) an accelerated mortar bar expansion test. Tentative limits are proposed for each phase of the protocol, which still need to be validated through the testing of a wider range of aggregates. [ABSTRACT FROM AUTHOR]

Objective: To evaluate the safety and effectiveness of transvaginal ultrasound guided injection of hot saline into the ovarian stroma in polycystic ovary syndrome (PCOS) cases in an office based gynecology practice under local anesthesia.Setting: Outpatient gynecologic clinic.Study Design: Pilot study.Participants: Fifty-two anovulatory infertile females diagnosed as PCOS by clinical, chemical and ultrasound criteria were recruited for the study. All cases were resistant to clomiphene citrate for more than 6 months.Intervention: Injection of warm sterile saline (75C) into the ovarian stroma under transvaginal monitoring using ovum pickup needle.Outcome Measures: Cycle regularity, ovulation rate and safety were primary outcomes. Pregnancy rate and patient convenience were our secondary outcomes.Results: Ovulation has been achieved in 73.1% of clomiphene citrate resistant PCOS cases and resulted in pregnancy in 26.9% of these cases. No adverse effects were recorded and the procedure was tolerable in most cases.Conclusion: Transvaginal ultrasound guided ovarian stroma hydrocoagulation (TOSH) in an office setting seems to be a safe, economic and practical procedure that is acceptable by the patients. If larger studies confirm its effectiveness it may be an attractive alternative to conventional ovarian drilling. [ABSTRACT FROM AUTHOR]