Dynamic Analysis Of Offshore Structures

This study comprises three main parts: (1) Pile Driving Analysis. The conventional one dimensional wave equation analysis of the pile driving problem suffers from the empirical representation of the soil parameters. In this study, an improved one dimensional wave equation model is developed which accounts for wave propagation in the soil mass and thus gives more realistic prediction of the pile displacements. A three dimensional finite element analysis of the problem is also formulated and its results are compared with those of the one dimensional analysis. The finite element analysis is computationally very expensive which is not justified due to its sensitivity to the input parameters. (2) Modelling of Wave Forces. Lack of spatial correlation of short crested waves is accounted for using a coherence function model and the wave forces estimated using this model are compared with those estimated using the directional spectrum model. Both models are found to give comparable resultant wave forces and their attenuation with separation if their parameters are properly chosen. The error resulting from assuming a constant water particle velocity along the tributary length is examined and appears to be small. (3) Response of Fixed Offshore Towers to Random Wave Forces Accounting for Pile-Soil-Pile Interaction. Dynamic pile-soil-pile interaction under the effect of wave forces is usually neglected in the design of offshore towers. It is examined and found to have a significant effect on the response of the tower to random waves. It is incorporated in the analysis using dynamic interaction factors which consider pile-soil separation. The response of the tower is found to be greatly influenced by pile-soil-pile interaction which is attributed to the increase in flexibility and damping of the tower

Infundebulectomy in management of uterine artery or uterine wall injury during complicated and difficult caesarean section: case series study

It is case series trying to save uterus in situation where one site of it is severely injured or in severe uncontrollable bleeding in one of the uterine arteries either during control of massive hemorrhage associated with friable tissues with severe adhesion, some cases of placenta accrete spectrum, some cases of uterine rupture and in caesarean section myomectomy

Human chorionic gonadotropin administration is associated with high pregnancy rates during ovarian stimulation and timed intercourse or intrauterine insemination

Abstract Background There are different factors that influence treatment outcome after ovarian stimulation and timed-intercourse or intrauterine insemination (IUI). After patient age, it has been suggested that timing of insemination in relation to ovulation is probably the most important variable affecting the success of treatment. The objective of this study is to study the value of human chorionic gonadotropin (hCG) administration and occurrence of luteinizing hormone (LH) surge in timing insemination on the treatment outcome after follicular monitoring with timed-intercourse or intrauterine insemination, with or without ovarian stimulation. Methods Retrospective analysis of 2000 consecutive completed treatment cycles (637 timed-intercourse and 1363 intrauterine insemination cycles). Stimulation protocols included clomiphene alone or with FSH injection, letrozole (an aromatase inhibitor) alone or with FSH, and FSH alone. LH-surge was defined as an increase in LH level ≥200% over mean of preceding two days. When given, hCG was administered at a dose of 10,000 IU. The main outcome was clinical pregnancy rate per cycle. Results Higher pregnancy rates occurred in cycles in which hCG was given. Occurrence of an LH-surge was associated with a higher pregnancy rate with clomiphene treatment, but a lower pregnancy rate with FSH treatment. Conclusions hCG administration is associated with a favorable outcome during ovarian stimulation. Awaiting occurrence of LH-surge is associated with a better outcome with CC but not with FSH treatment

Study of fluid transients in closed conduits annual report no. 1

Atmospheric density effect on computation of earth satellite orbit

The role of aromatase inhibitors in ameliorating deleterious effects of ovarian stimulation on outcome of infertility treatment

Clinical utilization of ovulation stimulation to facilitate the ability of a couple to conceive has not only provided a valuable therapeutic approach, but has also yielded extensive information on the physiology of ovarian follicular recruitment, endometrial receptivity and early embryo competency. One of the consequences of the use of fertility enhancing agents for ovarian stimulation has been the creation of a hyperestrogenic state, which may influence each of these parameters. Use of aromatase inhibitors reduces hyperestrogenism inevitably attained during ovarian stimulation. In addition, the adjunct use of aromatase inhibitors during ovarian stimulation reduces amount of gonadotropins required for optimum stimulation. The unique approach of reducing hyperestrogenism, as well as lowering amount of gonadotropins without affecting the number of mature ovarian follicles is an exciting strategy that could result in improvement in the treatment outcome by ameliorating the deleterious effects of the ovarian stimulation on follicular development, endometrial receptivity, as well as oocyte and embryo quality

Shock Wave-Boundary Layer Interaction with Tangential Injection

Mechanical Engineerin

Four hundred micrograms buccal misoprostol versus five units intravenous oxytocin in prevention of postpartum hemorrhage in elective caesarean section, randomized controlled study

Background: The number of studies has been increased about the use of misoprostol during caesarean delivery to prevent obstetric hemorrhage, but may be no study compare buccal misoprostol versus oxytocin in prevention of obstetric hemorrhage during and post cesarean section. Our study is done to compare buccal misoprostol 400 mcg versus oxytocin 5iu intravenous bolus in prevention of postpartum hemorrhage during and post elective cesarean section.Methods: A prospective registered, double blinded, randomized controlled trial Operative list or emergency unit at Obstetrics and Gynecology Department, Women Health Hospital, Assiut university, Egypt, comparing 77 patients in each group after verbal consent.Results: There was significant difference between both groups regarding total amount of blood loss (intra partum plus post-partum) 555.45±74.33 in oxytocin group versus522.6±88.76 in misoprostol group.Conclusions: Buccal misoprostol is more effective than intravenous infusion of oxytocin in reducing blood loss during elective cesarean delivery. However, occurrence of temporary side effects such as fever and chills was more frequent with the use of misoprostol. Clinical trial.gov: NCT03676621

Gestational Sac Aspiration of Heterotopic Ectopic Pregnancy in a Cesarean Section Scar

Background: This article describes a case of heterotopic pregnancy that included a normal twin intrauterine pregnancy and one cesarean section (CS) scar pregnancy diagnosed at 6 weeks of gestation. Ultrasound-guided aspiration of the ectopic gestational sac was performed, and the concurrent twin intrauterine pregnancy (IUP) was preserved successfully. The patient was a 50-year-old woman with secondary infertility. Case: The patient underwent in vitro fertilization and embryo transfer using a donor-egg program to achieve pregnancy with her current partner. At 6-weeks' gestation, she underwent a transvaginal ultrasound scan (US) examination showing a viable twin IUP with a third gestational sac with viable embryo located low within the anterior wall of the uterus. The appearance was consistent with a cesarean scar ectopic pregnancy. This was confirmed on a subsequent US 1 week later. She desired to continue the intrauterine pregnancy. US-guided aspiration of the cesarean scar ectopic pregnancy was attempted. The treatment was successful. Results: The twin pregnancy progressed without further complications. Conclusions: Heterotopic CS ectopic pregnancy can be successfully treated with transvaginal US-guided aspiration. (J GYNECOL SURG 29:317)Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140090/1/gyn.2012.0026.pd

Prevalence of blighted ovum in first trimester of pregnancy: a hospital based study

Background: The aim of this study is to know the prevalence of blighted ovum among pregnant women in 1st trimester attending our hospital during their antenatal visits and to know the fate of blighted ovum either if there is spontaneous expulsion of the sac or need of medical induction or surgical evacuation.Methods: This observational study was conducted at Obstetrics and Genecology Department, Women Health Hospital and Sahel Selim Hospital, Egypt from November 2015 to February 2018. All patients recruited in this study attended the antenatal care clinics for antenatal follow-up during their first-trimester of pregnancies.Results: All cases of the study were less than 14 weeks. The mean gestational age was 8.93±1.01 (7.0-11.0) weeks. In patients less than 20 years old, (73%) there is a significant increase in surgical treatment (dilatation & curettage) after failure of medical treatment, patients more than 40 years old (50.7%) there is a significant increase in medical treatment after success taking misoprostol so there is no need to a surgical treatment by (dilatation & curettage) in the majority of cases.Conclusions: The prevalence of blighted ovum was 15.6%. Also, the prevalence of blighted ovum was statistically significant increased with increase maternal age and also, we noticed that there was a statistically significant association between early pregnancy failure and a history of previous early pregnancy loss