The Space Technology 7 Disturbance Reduction System (ST7-DRS) is a NASA technology demonstration payload that operated from January 2016 through July of 2017 on the European Space Agency's LISA Pathfinder spacecraft. The joint goal of the NASA and ESA missions was to validate key technologies for a future space-based gravitational wave observatory targeting the source-rich milliHertz band. The two primary components of ST7-DRS are a micropropulsion system based on colloidal micro-Newton thrusters (CMNTs) and a control system that simultaneously controls the attitude and position of the spacecraft and the two free-flying test masses (TMs). This paper presents our main experimental results and summarizes the overall the performance of the CMNTs and control laws. We find that the CMNT performance to be consistent with pre-flight predictions, with a measured system thrust noise on the order of 100 nN/ √ Hz in the 1 mHz ≤ f ≤ 30 mHz band. The control system maintained the TM-spacecraft separation with an RMS error of less than 2 nm and a noise spectral density of less than 3 nm/ √ Hz in the same band. Thruster calibration measurements yield thrust values consistent with the performance model and ground-based thrust-stand measurements, to within a few percent. We also report a differential acceleration noise between the two test masses with a spectral density of roughly 3 fm/s 2 / √ Hz in the 1 mHz ≤ f ≤ 30 mHz band, slightly less than twice as large as the best performance reported with the baseline LISA Pathfinder configuration and below the current requirements for the Laser Interferometer Space Antenna (LISA) mission.
With an objective of assessing intra population variation with a special reference to sex differences in a number of body size and shape measurements, a cross sectional sample of 800 adult Santhals (400 males and 400 females) were collected from the Bankura district of West Bengal. The study reveals that Santhals are short statured, dolihocephalic, mesorrhinae, and euryprosopic people. They are well adapted to their physical as well as climatic conditions. Sex difference is clearly evident in their body measurements, as Santhal males are significantly taller, heavier, possess greater bone breadths (except biiliocristal breadth) and circumferences than Santhal females.
BackgroundIn chronic obstructive pulmonary disease (COPD), pulmonary rehabilitation (PR) is an integral component of the non-pharmacological management of COPD. Yoga has proven to be beneficial in COPD, although well-designed comparative studies between the two modalities are lacking. This pilot study aims to compare these two modalities delivered as supervised tele-intervention. MethodsThe outpatient department (OPD) of a tertiary hospital recruited consenting, consecutive, inclusion-eligible COPD participants who were randomly assigned to intervention and control arms of 30 patients each. The intervention arm received a 45-minute tele-yoga therapy module (T-YT) validated by content validity ratio (CVR), computed using Lawshe's methodology and responses from 24 yoga specialists. The control arm received a 45-minute standardized tele-pulmonary rehabilitation session (T-PR). T-YT and T-PR were both managed through an online portal. Exercise capacity as measured by the six-minute walk distance (6MWD), symptom score (COPD assessment test [CAT], modified medical research council [mMRC]), forced expiratory volume in one second (FEV1%), quality of life (QoL) scores, St. George respiratory questionnaire (SGRQ), depression and anxiety scores (patient health questionnaire [PHQ-9] and generalized anxiety disorder scale [GAD-7] scores), were recorded at baseline and at the end of three months. Results6MWD, symptom scores, SGRQ, PHQ-9, and GAD-7 all improved significantly from baseline within each group, but there was no statistically significant difference between the groups. FEV1% did not differ significantly between or among groups. This study shows T-YT module can be a reasonable substitute for T-PR in patients with COPD. ConclusionsT-YT is beneficial in patients of COPD in terms of exercise capacity, symptom scores, and depression and anxiety scores and can be a reasonable alternative to T-PR.
A random sample of 274 native male Bods of Ladakh ranging in age from 11 to 19 years, living in Leh (Ladakh) at mean altitude of 3,514 metres, was studied. The pattern of growth of this sample was compared with the sea level Indians. The results indicate that: (1) The so called adolescent spurt is not well defined among Bod highlanders. (2) Bods grow faster than plain dwelling Indians and are taller and heavier at the age of 19 years. (3) The highlanders exhibit greater chest circumference than the lowland norms. This finding, similar to those among Andean natives, supports high altitude hypoxia's role in human growth and morphology.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.