Magneto-transport characteristics of La1.4Ca1.6Mn2O7 thin film deposited by spray pyrolysis

Polycrystalline thin films of double layer manganite La_1.4Ca_1.6Mn_2O_7 (DLCMO) have been deposited by nebulized spray pyrolysis on single crystal LaAlO_3 substrates. These single phase films having grain size in the range 70-100 nm exhibit ferromagnetic transition at T_C ~ 107K. The short range ferromagnetic ordering due to in plane spin coherence is evidenced to occur at a higher temperature around 225 K. Insulator/semiconductor to metal transition occurs at a lower temperature T_P ~ 55K. The transport mechanism above T_C is of Mott`s variable range hopping type. Below T_C the current-voltage characteristics show non-linear behaviour that becomes stronger with decreasing temperature. At low temperatures below T_CA ~ 30K a magnetically frustrated spin canted state is observed. The DLCMO films exhibit resonable low field magnetoresistance and at 77K the magnetoresistance ratio is ~ 5% at 0.6 kOe and \~ 13% at 3 kOe.Comment: 14 pages, 7 figure

To study the outcome of previous one cesarean pregnancies in a rural tertiary center of Haryana, India

Background: Rising rates of caesarean section is a matter of great concern and TOLAC is an attractive alternative. Analysing outcome of previous one caesarean pregnancies will provide an insight for reducing the caesarean rates and formulating protocols and policies for TOLAC.Methods: A retrospective study of patients of previous one caesarean pregnancy was done from February 2015 to January 2016 and 3 groups were made, ERCS group, failed TOLAC group and successful TOLAC group. The rates of elective repeat caesarean, failed TOLAC, successful TOLAC, maternal complications, neonatal morbidity and mortality in all three groups were studied.Results: There were 5177 total deliveries with 488 (9.43%) previous one caesarean pregnancies. Out of 488 patients 161 (33%) underwent elective repeat caesarean and 327 (67%) underwent trial of labour. Out of 327 patients 234 (71.56%) had a successful TOLAC and 93 (28.44%) had failed TOLAC. Breech (23%) followed by foetal distress (20%) were the most common indications of previous caesarean. Commonest indication of elective repeat caesarean was short interval (33%) and that of failed TOLAC was foetal distress (38.7%) followed by failed induction (23.6%). There were 4 morbidly adherent placentas (0.82%), 1 scar rupture, 3 scar dehiscence, no maternal mortality and 10 neonatal deaths.Conclusions: Previous one caesarean section is not only a risk factor for repeat caesareans and complications like morbidly adherent placenta, uterine rupture but also a financial burden on health facilities. Encouraging the patients for trial of labour and emphasizing the usage of contraception is the need of the hour

To compare intrapartum cardiotocographic (CTG) recording with conventional intermittent fetal heart auscultation during labor

Standard evaluation of fetal well-being during labor includes the periodic assessment of the fetal heart rate (FHR), its pattern and response to intrapartum stimuli and events. Effective methods of evaluation and meaningful interpretation of FHR data range from non-invasive techniques like Intermittent Auscultation, continuous electronic fetal heart rate (FHR) monitoring to invasive techniques of fetal blood gas analysis and fetal ECG

Влияние репутации андеррайтера на результаты первого публичного размещения акций компаний малого бизнеса

The purpose of the study is to determine the impact of the underwriter’s reputation on shaping the short- and long-term IPO success of small businesses. The paper uses IPO data from 2012 to 2020, three reputable proxy and event-time methodologies to analyze the company’s performance through market-adjusted excess returns, cumulative abnormal returns and buy & hold returns. Similarly, to mitigate common predispositions, use the calendar-time methodology, Fama-French three-factor model and Carhart four-factor model with high and low reputational groups. The study revealed a significant positive impact of underwriters’ reputations on first-day returns and long-term performance. Overall, the results indicate that, in the longterm, IPOs of Indian small and medium-sized enterprises are over efficient with regard to reputation signals. On the contrary, the calendar-time method and multifactor model indicate the low long-term IPO effectiveness of the SME. According to the authors’ conclusion, this is the first study to assess the impact of underwriter reputation on business performance using several reputation indicators, the calendar time methodology, and the multi-factor model on the ICP’s Indian IPO platform.Цель исследования — определить влияние репутации андеррайтера на формирование краткосрочного и долгосрочного успеха IPO малых предприятий. Используются данные по IPO с 2012 по 2020 г., три репутационных прокси и методология событийного времени для анализа эффективности компании через скорректированную на рынок избыточную доходность, кумулятивную аномальную доходность и доходность от покупки и удержания. Аналогичным образом для смягчения общих предрасположенностей авторы используют методологию календарного времени, трехфакторную модель Фамы-Френча и четырехфакторную модель Кархарта с группами с высокой и низкой репутацией. Исследование показало значительное положительное влияние репутации андеррайтеров на доходность первого дня и долгосрочные показатели. В целом результаты свидетельствуют о том, что в долгосрочной перспективе IPO индийских малых и средних предприятий характеризуются избыточной эффективностью в отношении репутационных сигналов. Напротив, метод календарного времени и многофакторная модель свидетельствуют о низкой долгосрочной эффективности IPO МСП. Насколько известно авторам, это первое исследование, в котором изучается влияние репутации андеррайтеров на результаты деятельности компании с использованием нескольких репутационных показателей с применением методологии календарного времени и многофакторной модели на индийской площадке IPO МСП

Scalar Fields in BTZ Black Hole Spacetime and Entanglement Entropy

We study the quantum scalar fields in background of BTZ black hole spacetime. We calculate the entanglement entropy using the discretized model, which resembles a system of coupled harmonic oscillators. The leading term of the entropy formula is standard Bakenstein-Hawking entropy and sub-leading corresponds to quantum corrections to black hole entropy. We calculate the co-efficent of sub-leading logarithmic corrections numerically.Comment: journal version, numerical section on entropy revise

Time-dependent supergravity solutions in null dilaton background

A class of time dependent pp-waves with NS-NS flux in type IIA string theory is considered. The background preserves 1/4 supersymmetry and may provide a toy model of Big Bang cosmology with non trivial flux. At the Big Bang singularity in early past, the string theory is strongly coupled and Matrix string model can be used to describe the dynamics. We also construct some time dependent supergravity solutions for D-branes and analyze their supersymmetry properties.Comment: 11 pages, a typo is fixed in eqn 20. To appear in Phys. Lett.

Brane Solutions with/without Rotation in PP-wave Spacetime

We present two classes of brane solutions in pp-wave spacetime. The first class of branes with a rotation parameter are constructed in an exact string background with NS-NS and R-R flux. The spacetime supersymmetry is analyzed by solving the standard Killing spinor equations and is shown to preserve the same amount of supersymmetry as the case without the rotation. This class of branes do not admit regular horizon. The second class of brane solutions are constructed by applying a null Melvin twist to the brane solutions of flat spacetime supergravity. These solutions admit regular horizon. We also comment on some thermodynamic properties of this class of solutions.Comment: 17 pages, added references, to be published in Nucl. Phys.

Enhanced Room Temperature Coefficient of Resistance and Magneto-resistance of Ag-added La0.7Ca0.3-xBaxMnO3 Composites

In this paper we report an enhanced temperature coefficient of resistance (TCR) close to room temperature in La0.7Ca0.3-xBaxMnO3 + Agy (x = 0.10, 0.15 and y = 0.0 to 0.40) (LCBMO+Ag) composite manganites. The observed enhancement of TCR is attributed to the grain growth and opening of new conducting channels in the composites. Ag addition has also been found to enhance intra-granular magneto-resistance. Inter-granular MR, however, is seen to decrease with Ag addition. The enhanced TCR and MR at / near room temperature open up the possibility of the use of such materials as infrared bolometric and magnetic field sensors respectively.Comment: 22 pages of Text + Figs:comments/suggestions([email protected]

A knowledge, attitude and practice study of prescribing oxygen amongst interns in atertiary care hospital

Background: Oxygen is one of the most frequently prescribed health-care interventions and resuscitative methods to patients visiting the emergency or while admitted to the hospital. The ongoing COVID pandemic has emphasized the importance of efficient and optimal oxygen utilization. The interns in a teaching hospital are often the first point of contact for patients. Materials and Methods: A cross-sectional questionnaire-based study was done amongst 100 interns posted in areas where oxygen is routinely prescribed. For this study, a questionnaire was devised by the investigators to assess the Knowledge, Attitude and Practice of prescribing oxygen therapy. The questionnaire also included the validated acute oxygen therapy questionnaire (AOTQ). Results: Knowledge of participants ascertained using the validated AOTQ questionnaire revealed a score of 16.59 ± 1.94 out of a maximum of 23 points suggesting that majority of participants possessed mediocre knowledge. The author’s questionnaire showed significant gaps in knowledge and attitude; participants were relatively ill-informed about the interfaces used, the indications, and monitoring required while administering oxygen. Conclusion: There is an admissible gap in knowledge, attitude and practices pertaining to oxygen therapy as compared to the ideal. The development of standard training guidelines and suitable methodologies is absolutely crucial so that optimal therapy can be provided by fresh medical graduates without compromising patient care