High voltage vanadium-metal hydride rechargeable semi-flow battery

We report a Vanadium-MH rechargeable semi-flow battery with an experimental OCV of 1.93 V and operating voltage of 1.70 V, very high values among rechargeable flow batteries with aqueous electrolytes. This hybrid battery consists of a graphite felt positive electrode operating in a mixed solution of 0.128 mol dm−3 VOSO4 and 2 mol dm−3 H2SO4, and a metal hydride negative electrode in 2 mol dm−3 KOH aqueous solution. The two electrolytes of different pH are separated by a bipolar membrane. The system demonstrated good reversibility and high efficiencies in coulomb (95%), energy (84%), and voltage (88%).postprin

Study of the electrochemical behavior of high voltage vanadium-metal hydride hybrid semi-flow battery

The Conference abstracts website is located at http://ma.ecsdl.org/content/by/yearSession - Redox Flow Batteries: Cell Characterization: abstract 2013 MA2013-01 481A vanadium-MH rechargeable semi-flow battery hybridizing the V4+/V5+ redox couple (positive) with the metal hydride (negative) was investigated. This battery has a higher cell voltage and the V(II)/V(III) redox couple is absent, hence avoiding the problems of V2+ oxidation. An experimental open circuit voltage of 1.86 V and an operating voltage of 1.65 V for this hybrid battery were obtained. These are very high values among all rechargeable flow batteries. The system demonstrated superior stability, reversibility, and efficiencies in coulomb (97%), energy (81.3%), and voltage (83.8%). © 2013 ECS - The Electrochemical Societypostprin

HKCOG guidelines: induction of ovulation

This guideline by The Hong Kong College of Obstetricians and Gynaecologists (HKCOG) covers the classification of ovulation disorders, treatment options of various ovulation disorders, and their associated risks.published_or_final_versio

Electrochemical study of mesoporous core-shell lithium titanate carbon composite with controlled microstucture as anode in lithium ion batteries for wide temperature range

Session - Nanomaterials for Energy Storage IV: paper 386888Integrate carbon and lithium titanate (Li4Ti5O12) with appropriate structure control would enhance the rate performance of Li4Ti5O12 as anode with improved electronic conductivity.[1-4] In this study, carbon with hollow core and mesoporous shells of controlled dimensions (in terms of diameter of core, thickness of the shell and diameter of the mesopores) were synthesized via silica hard-template method. Li4Ti5O12-carbon composites were built through impregnation of Li4Ti5O12 into the core-shell carbon. Cross-section TEM studies have been performed and proved that Li4Ti5O12 particles are impregnated within the mesoporous carbon shell structure …postprin

Role of Baseline Antral Follicle Count and Anti-Mullerian Hormone in Prediction of Cumulative Live Birth in the First In Vitro Fertilisation Cycle: A Retrospective Cohort Analysis

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Evaluating the role of serum AMH in predicting suboptimal or excessive ovarian response to standard dosing regimen of ovarian stimulation in in-vitro fertilisation using GNRH agonist long protocol

Poster PresentationConference Theme: The Oocyte: from Basic Research to Clinical PracticeIntroduction: Antral follicle count (AFC) is widely used for individualising gonadotrophin dosage in in-vitro fertilisation (IVF) treatment. This retrospective study tried to determine whether baseline serum anti-Mullerian hormone (AMH) measurement would offer any additional role in predicting suboptimal or excessive ovarian response among subjects classified to have normal ovarian reserve based on AFC. Methods: We reviewed 338 women undergoing the first IVF cycle using GnRH agonist long protocol who had baseline AFC of 6 to 14. Ovarian stimulation was initiated with gonadotrophin 300IU daily for two days followed by 150IU daily. Archival serum samples taken on the day before starting gonadotrophin were assayed for AMH. High responders were defined by retrieval of 15 or more oocytes or peak serum oestradiol >20000 pmol/l. Low responders were defined by retrieval of 5 or less oocytes. Results: Among the study cohort, 201 (59.5%), 77 (22.8%) and 73 (21.6%) women had optimal, low and high ovarian response respectively, and their respective median AMH concentrations differed significantly (22.5, 15.1 and 36.1 pmol/l). The area under the ROC curves for predicting high and low response were 0.740 and 0.688 respectively. At the best cut-off of 29 pmol/l, AMH has a sensitivity of 66% and specificity of 73% for predicting high response. At the best cut-off of 15 pmol/l, it has a sensitivity of 52% and specificity of 79% for predicting low response. Conclusion: Baseline serum AMH measurement offers a modest role for individualisation of gonadotrophin dosage in women with normal ovarian reserve based on AFC.published_or_final_versio

A randomized double-blind controlled trial of the use of dydrogesterone in women with threatened miscarriage in the first trimester: study protocol for a randomized controlled trial

BACKGROUND: Miscarriage is a common complication of pregnancy occurring in 15-20 % of all clinically recognized pregnancies. Currently, there is still no good scientific evidence to support the routine use of progestogens for the treatment of threatened miscarriage because the existing studies were not large enough to show a significant difference and some of them were not randomized or double-blind. METHODS: This is a double-blind, randomized controlled trial. A total of 400 patients presenting with first-trimester threatened miscarriage will be enrolled. They will be randomized to take dydrogesterone 40 mg per os, followed by 10 mg per os three times a day or placebo until twelve completed weeks of gestation or 1 week after the bleeding has stopped, whichever is longer. The primary outcome is the percentage of miscarriage before 20 weeks of gestation. DISCUSSION: We postulate that the dydrogesterone therapy will significantly reduce the risk of miscarriage in women with threatened miscarriage. TRIAL REGISTRATION: This study is registered at ClinicalTrials.gov, NCT02128685 . Registered on 29 April 2014.published_or_final_versio

Comparison of acid and alkaline hydrogen-bromine fuel cell systems

The Conference abstracts' website is located at https://ecs.confex.com/ecs/224/webprogram/Paper20002.htmlSession - Vanadium Redox Systems 2 and Other Redox Systems 1: abstract no. 1674The hydrogen bromine (H2-Br2) fuel cell system is an attractive system for electrical energy storage because of its high round-trip conversion efficiency, high power density capability, and anticipated low costs. The hydrogen-bromine fuel cell system can be operated in the acid or alkaline modes. The charge and discharge electrode reactions in an acid H2-Br2 fuel cell system are as follows …postprin

A randomized, controlled, pilot trial on the effect of dehydroepiandrosterone on ovarian response markers, ovarian response, and in vitro fertilization outcomes in poor responders

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Evaluation of pre-stimulation anti-mullerian hormone level in predicting cumulative live-birth in IVF

Theme: Building Consensus in Gynecology, Infertility and Perinatology (BCGIP)BACKGROUND: Serum anti-Mullerian hormone (AMH) level has been used as a useful marker of ovarian response in assisted reproduction. We evaluated for the first time the role of baseline AMH level in predicting cumulative pregnancy outcome during in-vitro fertilisation (IVF) treatment. METHODS: We studied 320 women (aged 22-44) undergoing IVF with or without intracytoplasmic sperm injection using GnRH agonist long protocol. Baseline AMH levels on the day before commencing ovarian stimulation were analysed. The main outcome measures were cumulative live-birth, live-birth in the fresh cycle and ovarian response. RESULTS: There was a trend of higher median AMH levels in subjects achieving live-birth in the fresh …postprin