Comparative Study on Characteristics of Partial Discharge Optical Pulse and UHF Pulse in Switch Equipment

The article explores the performance of the new silicon photoelectric sensor in partial discharge detection, and compares the measured optical pulse with the traditional UHF pulse. Through optical and electrical synchronous partial discharge experiments, the article analyzes and discusses the detection performance, working characteristics and statistical characteristics of various sensors, and explores the advantages and feasibility of silicon photoelectric partial discharge sensors in actual discharge monitoring; In addition, the statistical performance of the two physical phenomena of partial light radiation and electromagnetic radiation was obtained through the analysis of optical and electrical synchronous monitoring data. Compared with UHF sensor, silicon photoelectric sensor under the optimal working voltage has a higher signal-to-noise ratio (SNR); Under the electromagnetic interference of the high-frequency motor, silicon photoelectric sensor exhibits better anti-electromagnetic interference ability; Discharge phase interval and characteristics reflected by the PRPD obtained by two detection methods maintain good consistency; Pulse repetition rate has the same trend with applied voltage, but statistical frequency of optical pulses obtained is higher than that of electromagnetic pulses because silicon photoelectric sensor has a higher SNR and single-photon sensitivity.

CHROMOSPHERIC ACTIVITY NATURE OF KIC 6044064

This study presents results obtained from the data of KIC 6044064 (KOI 6652). KIC 6044064 was observed by the Kepler Mission for a total of 1384.254 days. 525 minima times were determined, 264 of which were primary minima and the rest were secondary minima. The OPEA model was derived and its parameters were obtained. On the secondary component, there are two different spot bands latitudinally outstretched, consisting of three spots located with a phase interval of 0.33. The average migration period was found to be 623.063±4.870 days (1.71±0.01 years) for the first spot group, while it was 1125.514±7.305 days (3.08±0.02 years) for the second group. The spectral types of the components seem to be G7V+K9V. Their masses and radii were determined to be 0.86Mʘ and 0.89Rʘ for the primary component and 0.54Mʘ and 0.62Rʘ for the secondary component.

The effect of dexamethasone on labor induction: a systematic review

Background To evaluate the effect of dexamethasone administration on the interval between initiation of labor induction and active phase of labor. Methods The databases including PubMed, Cochrane Library, Embase, Scopus and Web of Science were searched for studies published up to June 27, 2021. Two types of articles were included: a) full-text articles published in English or any other languages, and b) Randomized Controlled Trials (RCTs). Participants were primi- or multigravida women with term or post-term pregnancy. The intervention group received parenteral or extra-amniotic dexamethasone whereas the control group received normal saline or no treatment before initiation of labor induction. All data were analyzed using Review Manager 5.3. Results Seventeen studies involving 1879 patients were included in the meta-analysis. Administration of dexamethasone reduced the interval between the initiation of labor induction and the beginning of active phase by about 70 min [MD: - 1.17 (− 1.37, − 1.00); P < 0.00001]. Duration of the first stage of labor in the dexamethasone group was about 88 min shorter than that in the control. There were no maternal and fetal adverse effects. Conclusions Dexamethasone could significantly reduce the length of induction-active phase interval, and length of the first stage of labor, with no difference in maternal or fetal adverse effects.

Mission Planning for Optical Satellite’s Constant Surveillance to Geostationary Spacecraft

For a mission to constantly watch geostationary (Orbital inclination isn’t 0, GEO) spacecraft by an optical satellite during a whole fly-around cycle, study the relative position relationship between the two and sun during fly-around mission; design the trajectory of the optical satellite, on which, the optical satellite keeps facing to the spacecraft in the direction opposite the Sun. Firstly, for constant surveillance to geosynchronous (Orbital inclination is 0) spacecraft, study from the Keplerian orbit elements, analyze its geometric relationship with the sun and the optical satellite. Then calculate the initial phase interval that meets the requirements of the mission. Compared with Clohessy-Wiltshire equation (CW equation), this method is more concise and the spatial physical meaning is clearer. However, the orbital inclination of GEO spacecraft is usually not 0. Secondly, taking GEO spacecraft with 1° inclination as an example, calculate the initial phase interval of the mission. Thirdly, select an initial phase in the initial phase interval, and design the fly-around trajectory based on CW equation. Lastly, the optical satellite’s position when it receives the mission is initial position, and the position when the fly-around mission starts is final position. The optical satellite’s approach trajectory is summarized as spacecraft's Lambert trajectory optimization. Take the time of two orbital maneuvers as optimization variables, and the fuel consumption as optimization objective. Optimize the plan of orbital maneuvering. The total pulse thrust velocity required for orbital maneuver after optimization in the example is 18.2514m/s, which is highly feasible in engineering. This method can be used for space situational awareness and in-orbit services of GEO spacecraft.

Mifepristone safety and efficacy in preinduction of labor: an observational study

Background: When the continuation of pregnancy adversely affecting the mother and fetus, termination of pregnancy is planned. Mifepristone as a method of pre-inducing agent in late pregnancy by increasing sensitivity of the uterus to the actions of prostaglandins and increasing uterine contractility. Objective of this study is to know the efficacy of mifepristone as a preinduction cervical ripening and induction of labor.Methods: In this prospective randomized study, 130 pregnant women are included and divided into two groups i.e. study group(n=65), has received tab mifepristone 200 mg and control group (n=65) has not received any drug. After the end of 24 hours, Bishops score in both the groups are assessed and those not in labor or with unfavourable cervix are administered with intracervical dinoprostone gel every 6 hourlies for maximum of 3 doses or until pregnant woman entered into active labor. Statistical analysis regarding improvement in Bishops score, induction active phase interval, induction delivery interval is observed.Results: After 24 hours, observation in the mean Bishops score has showed significant improvement in the study group (72.33%), when compared to control group (54.58%). % woman has gone into spontaneous labor in study group (61.5%), and in control group (75.4%). Induction to active phase time duration is less in study group with mean (10.53), and in control group (17.4). Induction to delivery time duration is also less in study group with mean (15.100) when compared to control group (22.100). 67.7% of patients has delivered by vaginally in study group, and in control group 41%.Conclusions: Tab. mifepristone 200 mg has a pre inducing agent for cervical ripening, shown better improvement in Bishops score within 24-48 hours and decreases time duration from induction to active phase and induction to delivery.

Classification Method for Network Security Data Based on Multi-featured Extraction

A method of classifying network security data based on multi-featured extraction is proposed to address instability of a nonlinear time series in a network security threat. Cybersecurity information is divided in line with the principle of acquiring multiple attributes. On this basis, an adaptive adaptation estimation technology is optimized in analogue. With the proposed method, a cybersecurity information classification system is constructed according to the phase interval reconstruction principle so that a dynamic and autonomous adaptation estimation of the cybersecurity threat can be completed to ensure the feasibility of cybersecurity information classification. The experimental result proves that the cybersecurity information classification technology based on multi-attribute extraction can effectively guide chaos into adjacent orbits and reasonably control the training scale. Moreover, the accuracy of the estimation is guaranteed and the cybersecurity threat is estimated because of its high-speed convergence and strong proximity. Therefore, the proposed classification technology can assist professionals and backstage managers in guaranteeing security by facilitating receipt of information in a timely manner.

Role of Dexamethasone in Induction of Labor: (A Randomized Clinical Trial)

Background Labor induction is a common obstetric procedure which is done for many indications. Ripening of the cervix is a complex process involving hormonal, vasodilatory and inflammatory changes. There are broad range of methods for cervical ripening and induction of labor. Aim of the study: to assess the efficacy of intramuscular administration of dexamethasone on the induction delivery-interval in full term women undergoing induction of labor. Patients and Methods This study was carried out between July 2018 and January 2019, at the labor ward of Ain Shams university maternity hospital, a double bind randomized control trial of 80 pregnant women undergoing induction of labor after obtaining the approval of the local ethical committee and a fully-informed written consent. They were randomized into two groups: group D (Dexamethasone group n = 40) and group C (control group n = 40). Results Of 80 pregnant women undergoing induction of labor there were no statistically significant differences between the two groups as regard their age, body mass index, gestational age and bishop score at time of intervention. There was significant statistical difference between the two groups as regard induction-active phase interval (P &lt; 0.05), mean induction-active phase interval in group D was (4.91±.85 hours) while in group C was (5.44±.83 hours). There was no significant statistical difference between the two groups as regard duration of active phase of labor, mean duration of active phase in group D was (4.10±.97 hours) and in group C (4.47±1.20 hours). There was significant statistical difference between the two groups as regard induction-delivery interval (P &lt; 0.05), mean induction-delivery interval in group D was (9.73±.1.52hours) while in group C was (10.70±1.87 hours). There were no statistically significant differences between the two groups as regard duration of 2nd and 3rd stages of labor. Conclusion Single intramuscular injections of 2 ml. (8mg) of dexamethasone before induction of labor seems to shorten induction-delivery interval by shortening the induction-active phase interval.

Detailed X-ray spectroscopy of the magnetar 1E 2259+586

Magnetic field geometry is expected to play a fundamental role in magnetar activity. The discovery of a phase-variable absorption feature in the X-ray spectrum of SGR 0418+5729, interpreted as cyclotron resonant scattering, suggests the presence of very strong non-dipolar components in the magnetic fields of magnetars. We performed a deep XMM-Newton observation of pulsar 1E 2259+586 to search for spectral features due to intense local magnetic fields. In the phase-averaged X-ray spectrum, we found evidence for a broad absorption feature at very low energy (0.7 keV). If the feature is intrinsic to the source, it might be due to resonant scattering and absorption by protons close to star surface. The line energy implies a magnetic field of ∼1014 G, which is roughly similar to the spin-down measure, ∼6 × 1013 G. Examination of the X-ray phase-energy diagram shows evidence for another absorption feature, the energy of which strongly depends on the rotational phase (E ≳ 1 keV). Unlike similar features detected in other magnetar sources, notably SGR 0418+5729, it is too shallow and limited to a short phase interval to be modeled with a narrow phase-variable cyclotron absorption line. A detailed phase-resolved spectral analysis reveals significant phase-dependent variability in the continuum, especially above 2 keV. We conclude that all the variability with phase in 1E 2259+586 can be attributed to changes in the continuum properties, which appear consistent with the predictions of the resonant Compton scattering model.