We update the ephemerides of 16 transiting exoplanets using our ground-based observations, new TESS data, and previously published observations including those of amateur astronomers. All these light ...curves were modeled by making use of a set of quantitative criteria with the EXOFAST code to obtain mid-transit times. We searched for statistically significant secular and/or periodic trends in the mid-transit times. We found that the timing data are well modeled by a linear ephemeris for all systems except for XO-2 b, for which we detect an orbital decay with the rate of -12.95 \(\pm\) 1.85 ms/yr that can be confirmed with future observations. We also detect a hint of potential periodic variations in the TTV data of HAT-P-13 b which also requires confirmation with further precise observations.
We study the transit timings of 10 exoplanets in order to investigate potential Transit Timing Variations (TTVs) in them. We model their available ground-based light curves, some presented here and ...others taken from the literature, and homogeneously measure the mid-transit times. We statistically compare our results with published values and find that the measurement errors agree. However, in terms of recovering the possible frequencies, homogeneous sets can be found to be more useful, of which no statistically relevant example has been found for the planets in our study. We corrected the ephemeris information of all ten planets we studied and provide these most precise light elements as references for future transit observations with space-borne and ground-based instruments. We found no evidence for secular or periodic changes in the orbital periods of the planets in our sample, including the ultra-short period WASP-103 b, whose orbit is expected to decay on an observable timescale. Therefore, we derive the lower limits for the reduced tidal quality factors (Q\(^{\prime}_{\star}\)) for the host stars based on best fitting quadratic functions to their timing data. We also present a global model of all available data for WASP-74 b, which has a Gaia parallax-based distance value ~25% larger than the published value.
This paper is a compressed summary of some principal definitions and concepts in the approach to the black box algebra being developed by the authors. We suggest that black box algebra could be ...useful in cryptanalysis of homomorphic encryption schemes, and that homomorphic encryption is an area of research where cryptography and black box algebra may benefit from exchange of ideas.
Intra-aortic balloon counterpulsation (IABP) related complications in a heterogeneous group of patients who received an IABP before or after thrombolytic therapy and mechanical revascularization or ...in the management of refractory unstable angina and myocardial infarction related mechanical complications were evaluated prospectively. Ninety-one patients were enrolled to the study. Mean IABP duration was 4.3±2.4 days. While the IABP was in place, three patients (3.3%) had femoral artery emboli, four patients (4.4%) had lower extremity ischemia that resolved after the removal of the balloon, eight patients (8.8%) had groin hematoma requiring blood transfusion (≤2 units) and four patients (4.4%) had intra-aortic balloon rupture. The relation of several risk factors to groin hematoma requiring ≤2 units blood transfusion, emboli, lower extremity ischemia and to total complications was evaluated. A chi-squared analysis showed that nadroparine use was more often complicated with emboli (
P=0.00005) and ischemic events (emboli and/or lower extremity ischemia) (three patients; 30% of nadroparine group vs. four patients; 4.9% of heparin group,
P=0.005) and hypercholesterolemia (>200 mg/dl) was more often complicated with lower extremity ischemia (
P=0.017). Forward conditional logistic regression analysis did not show any relation between the risk factors identified and emboli, lower extremity ischemia, ischemic events and groin hematoma (
P>0.05), but an inverse relation was found between IABP duration and total complications (
P=0.0198). In conclusion, IABP related complications were found to remain unchanged but were not life-threatening and were inversely related to IABP duration and this suggests shorter periods of IABP use whenever possible and one must be cautious to use low molecular weight heparin in patients with an IABP in place.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
This article presents a patient with an arteriovenous fistula between the brachiocephalic trunk and superior vena cava, a site not otherwise reported in the literature so far. The fistula was ...presumably the result of an accidental gunshot wound 8 years previously. Following the diagnosis, the fistula was repaired without any complication and the patient's symptoms disappeared.
The present prospective non-randomized study aimed to examine whether intraaortic balloon counter-pulsation (IABP) has a favorable effect on QT dispersion in patients with acute anterior MI. Patients ...with acute anterior MI who presented within 6 h after the symptom onset were assigned to the IABP+streptokinase or streptokinase (STK) group. The IABP+STK group was consisted of 26 men and two women (mean age 52.9±10.2). The STK group was consisted of 19 men and two women (mean age 54.4±10.8). In the IABP+STK group, mean QT interval dispersion significantly shortened 6 h after treatment (50.9±15.6 ms before STK, and 36±13.9 ms 6 h after STK;
P=0.001) and did not significantly change 24 h after STK (35.6±11.2 ms). In the STK group, mean QT interval dispersion did not vary significantly before and 6 h after STK (57.14±13.2 ms before STK, and 56.07±13.3 ms 6 h after STK;
P>0.05) but 24 h after STK it significantly shortened to 40.42±10.8 ms (
P<0.001). Before STK, mean QT interval dispersions in the IABP+STK and STK groups were 50.9±15.6 ms and 57.14±13.2 ms, respectively (
P>0.05), 6 h after STK, mean QT interval dispersions were 36±13.9 ms and 56.07±13.3 ms, respectively (
P=0.0001) and 24 h after STK, mean QT interval dispersions were 35.6±11.2 ms and 40.42±10.8 ms, respectively (
P>0.05). In conclusion this study demonstrates that the adjunct of IABP to thrombolytic therapy, in the setting of acute anterior MI, significantly decreases QT interval dispersion at 6 h and this effect might be secondary to accelerated reperfusion and/or other beneficial effects of IABP.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
