Prevalence and cause of Dyspnea in a general population: The Tromsø study

Background: Dyspnea is a prevalent condition causing reduced quality of life increasingly by age. The main causes are heart failure (HF), chronic obstructive pulmonary disease (COPD) with less common conditions being ischemic dyspnea, heart disease, atrial fibrillation, asthma, and pulmonary fibrosis. The aim of study was to determine causes of dyspnea in a general population through examination with echocardiography and spirometry and determine age and gender specific prevalence of each condition. Methods: This population based cross-sectional study included 11812 (46.9% were men) participants with answered questionnaire data on dyspnea from the sixth survey of Tromsø study. Independent-sample T-test (for continuous variables) and Chi-square test (for categorical variables) were used to explore significant difference in participant´s characteristics between men and women. Differences between groups were compared with ANOVA for continuous variable and logistic regression (univariate / multivariable analysis) was performed with dyspnea along demographic and baseline characteristics, COPD, restrictive disease and spirometry and echocardiography measurement group. Results: Overall 48.6% of the total participants reported dyspnea. Among participants with moderate COPD prevalence of dyspnea was 67.3% for men and 75% for women. The prevalence of enlarged LAD/BSA increased from 15% in subjects without self-reported dyspnea to 30% in moderate dyspnea without further increase with increasing severity. Only 25.2% of the participants reporting dyspnea symptoms had abnormal measurements. Among them only 43.6% of male subjects reporting dyspneic symptoms had abnormal measurements compared to 56.4% of women reporting dyspneic symptoms. Increase in severity of COPD was associated with increased prevalence of dyspnea. Moderate COPD [OR=2.6; 95% CI: 1.5-4.5] and severe COPD [OR=9.4; 95% CI: 2.0-44.7] were significantly associated with increased prevalence of dyspnea. Conclusion: Our study shows a strong association between self-reported dyspnea and diastolic heart failure, restrictive pulmonary disease and increasing levels of COPD

IMPACT OF HIGH-Κ METAL OXIDE AS GATE DIELECTRIC ON THE CERTAIN ELECTRICAL PROPERTIES OF SILICON NANOWIRE FIELD-EFFECT TRANSISTORS: A SIMULATION STUDY

Standard Metal-Oxide-Semiconductor Field Effect Transistors (MOSFETs) are gaining prominence in low-power nanoscale applications. This is largely attributed to their proximity to physical and thermal limits, rendering them a compelling option for energy-efficient electronic devices. In this study, we hypothesized that the high-κ HfO2 in a quasi-ballistic SiNW MOSFET acts as the gate dielectric. In this case, the data from the TCAD simulation and the model demonstrated exceptional agreement. The proposed model for a SiNW MOSFET with high-κ HfO2 exhibits a consistently increasing drain current, albeit with a smaller magnitude compared to a quasi-ballistic device (QBD). Additionally, it shows reduced mobility and decreased transconductance when considering the combined effects of scattering and temperature. As gate voltage increases, temperature-induced transconductance decline in SiNW MOSFETs becomes significant. Our method is suitable for modeling scattered SiNW MOSFETs with temperature effects, as TGF values are similar in the subthreshold region for both Near Ballistic and Scattered SiNW MOSFET models

Effect of Revascularization on Headache Associated with Moyamoya Disease in Pediatric Patients

Episodic headache is common in childhood moyamoya disease (MMD). The onset, mechanism, cause of headache and the effect of revascularization surgery on headache are not yet clear. We studied 10 cases of children (7 boys and 3 girls) younger than 18 years who underwent revascularization for MMD between 2009 and 2013. We evaluated frequency of headache and cerebral blood flow changes by single photon emission computed tomography brain imaging with [I123]-labeled iofetamine (IMP­SPECT) before and after surgery. Patients’ ages ranged from 0 to 15 years at onset and 2 to 17 years at the time of surgery, mean age being 6.7 and 8.0 years respectively. 9 of 10 patients presented with ischemic symptoms and 8 had headache. 5 patients underwent indirect bypass and 5 underwent combined direct and indirect bypass. Cerebral blood flow improvement was obtained in 14 of the 15 cerebral hemispheres revascularized mean follow-up duration was 32.9 months. All the patients had good outcomes with improvement of ischemic neurological deficits. Headache improved in 7 (87.5%) of 8 patients. Headache in pediatric moyamoya disease is associated with change in cerebral hemodynamics. Revascularization including combined direct bypass and indirect techniques may be required to reduce headache in patients with MMD

Solitary Cranial Langerhans Cell Histiocytosis : Two case reports

Langerhans cell histiocytosis (LCH) is a proliferation of Langerhans cells intermixed with inflammatory cells, in particular eosinophils, that may manifest as a unisystem (unifocal or multifocal) or multisystem disease. We describe the clinical and histologic spectrum of LCH of the orbit and skull in our two cases. Both cases had unifocal erosive skull lesions with a history of trauma. Typical histologic features included numerous histiocytes with varying degrees of giant cell formation and scattered eosinophilic granulocytes. The presence of Langerhans cells was confirmed by CD1a and S100 immunohistochemistry. LCH has an excellent prognosis when treated with surgical resection, steroids and radiotherapy or chemotherapy. One of our patients is disease free at 7 year follow-up and one patient had regression of lesion on follow-up

First measurement of the Hubble Constant from a Dark Standard Siren using the Dark Energy Survey Galaxies and the LIGO/Virgo Binary–Black-hole Merger GW170814

International audienceWe present a multi-messenger measurement of the Hubble constant H 0 using the binary–black-hole merger GW170814 as a standard siren, combined with a photometric redshift catalog from the Dark Energy Survey (DES). The luminosity distance is obtained from the gravitational wave signal detected by the Laser Interferometer Gravitational-Wave Observatory (LIGO)/Virgo Collaboration (LVC) on 2017 August 14, and the redshift information is provided by the DES Year 3 data. Black hole mergers such as GW170814 are expected to lack bright electromagnetic emission to uniquely identify their host galaxies and build an object-by-object Hubble diagram. However, they are suitable for a statistical measurement, provided that a galaxy catalog of adequate depth and redshift completion is available. Here we present the first Hubble parameter measurement using a black hole merger. Our analysis results in , which is consistent with both SN Ia and cosmic microwave background measurements of the Hubble constant. The quoted 68% credible region comprises 60% of the uniform prior range [20, 140] km s−1 Mpc−1, and it depends on the assumed prior range. If we take a broader prior of [10, 220] km s−1 Mpc−1, we find (57% of the prior range). Although a weak constraint on the Hubble constant from a single event is expected using the dark siren method, a multifold increase in the LVC event rate is anticipated in the coming years and combinations of many sirens will lead to improved constraints on H 0

Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model

We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO's second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h095%=3.47×10-25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering. © 2019 American Physical Society

Erratum: “Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015–2017 LIGO Data” (2019, ApJ, 879, 10)

Due to an error at the publisher, in the published article the number of pulsars presented in the paper is incorrect in multiple places throughout the text. Specifically, "222" pulsars should be "221." Additionally, the number of pulsars for which we have EM observations that fully overlap with O1 and O2 changes from "168" to "167." Elsewhere, in the machine-readable table of Table 1 and in Table 2, the row corresponding to pulsar J0952-0607 should be excised as well. Finally, in the caption for Table 2 the number of pulsars changes from "188" to "187.

Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model

We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO's second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h095%=3.47×10-25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering. © 2019 American Physical Society

Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model

We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO’s second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h95%0=3.47×10−25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering

Erratum: "A Gravitational-wave Measurement of the Hubble Constant Following the Second Observing Run of Advanced LIGO and Virgo" (2021, ApJ, 909, 218)

[no abstract available