Topic
Nova (rocket)
About: Nova (rocket) is a research topic. Over the lifetime, 7 publications have been published within this topic receiving 70 citations.
Papers published on a yearly basis
1 / 2
Papers
1 Jan 2019
TL;DR: The Terra Nova Expedition conducted extensive scientific experiments and collected valuable marine collections, including a great number of forms new to science.
Abstract: The Terra Nova Expedition, officially the British Antarctic Expedition, was led by Robert Falcon Scott with the primary objective of scientific experiments, observations and gathering of specimens and the secondary objective of being the first to reach the geographical South Pole. The Terra Nova Expedition, named after its supply ship, was a private venture, financed by public contributions augmented by a government grant. It had further backing from the Admiralty, which released experienced seamen to the expedition, and from the Royal Geographical Society. As well as its polar attempt, the expedition carried out a comprehensive scientific programme. The biologist in charge of operations on the ship was Mr. D. G. Lillie, M.A., to whose skill and energy the large and valuable marine collections are mainly due. On the outward and homeward voyages from England to New Zealand fine-meshed tow-nets were put overboard whenever possible, and seventy plankton samples were obtained; in addition two hauls were made with the trawl, one near the Falklands, at a depth of 125 fathoms, and one off Rio de Janeiro, at a depth of 40 fathoms. The winter cruise (July 10th to October 10th, 1911) round the Three Kings Islands and to the north of New Zealand produced biological results of great importance; eighty plankton samples were obtained, and the seven hauls made with trawl and dredge at depths of 15 to 300 fathoms revealed a bottom-fauna of extraordinary variety, including a great number of forms new to science. Between New Zealand and McMurdo Sound one hundred and thirty-five samples of plankton and fifty of muds and oozes were obtained; in the Ross Sea and in McMurdo Sound fifteen rich hauls with the trawl, at depths of 40 to 300 fathoms, produced a collection which has added greatly to our knowledge of the Antarctic marine fauna.
356 citations
1 Jan 2021
TL;DR: Nova Scotia Museum of Natural History freshwater mussel collection contains mostly Nova Scotia material, with representation from other North American provinces and temporally covering 1895-2009.
Abstract: This is the Nova Scotia Museum of Natural History collection of freshwater mussels. It contains mostly Nova Scotia material but there is also representation from New Brunswick, Newfoundland, the Northwest Territories, and other parts of North America. Temporally, specimens were collected from 1895 to 2009. The dataset was developed from the Nova Scotia Museum of Natural History (NSMNH) - Museum Information Management System (MIMS) as an electronic catalogue of specimen and collecting information.
160 citations
TL;DR: In this article , a survey of French food and nutrition specialists found that, although assignments were more consistent for some foods than others, overall consistency among evaluators was low, even when ingredient information was available.
Abstract: Abstract Background In the NOVA classification system, descriptive criteria are used to assign foods to one of four groups based on processing-related criteria. Although NOVA is widely used, its robustness and functionality remain largely unexplored. We determined whether this system leads to consistent food assignments by users. Methods French food and nutrition specialists completed an online survey in which they assigned foods to NOVA groups. The survey comprised two lists: one with 120 marketed food products with ingredient information and one with 111 generic food items without ingredient information. We quantified assignment consistency among evaluators using Fleiss’ κ (range: 0–1, where 1 = 100% agreement). Hierarchical clustering on principal components identified clusters of foods with similar distributions of NOVA assignments. Results Fleiss’ κ was 0.32 and 0.34 for the marketed foods ( n = 159 evaluators) and generic foods ( n = 177 evaluators), respectively. There were three clusters within the marketed foods: one contained 90 foods largely assigned to NOVA4 (91% of assignments), while the two others displayed greater assignment heterogeneity. There were four clusters within the generic foods: three clusters contained foods mostly assigned to a single NOVA group (69–79% of assignments), and the fourth cluster comprised 28 foods whose assignments were more evenly distributed across the four NOVA groups. Conclusions Although assignments were more consistent for some foods than others, overall consistency among evaluators was low, even when ingredient information was available. These results suggest current NOVA criteria do not allow for robust and functional food assignments.
143 citations
Book•
1 Jan 1980
TL;DR: A study of the development of the Saturn launch vehicle that took Americans to the moon in the 1960s and 1970s can be found in this article, with a preface by the author providing a 21st-century perspective on the historic importance of the Apollo project.
Abstract: A study of the development of the Saturn launch vehicle that took Americans to the moon in the 1960s and 1970s. The Saturn rocket was developed as a means of accomplishing President John F. Kennedy's goal for the United States to reach the moon before the end of the decade. Without the Saturn V rocket, and its capability of sending as payload the Apollo Command and Lunar Modules - along with support equipment and three astronauts - more than a quarter of a million miles from Earth, Kennedy's goal would have been unrealizable. This volume not only tells the story of the research and development of the Saturn rockets and the people who designed them but also recounts the stirring exploits of their operations from orbital missions around Earth testing Apollo equipment to their journeys to the moon and back. This history should be of interest to anyone seeking to understand the development of space flight in America and the course of modern technology. This reprint edition includes a new preface by the author providing a 21st-century perspective on the historic importance of the Saturn project.
64 citations
TL;DR: Very high energy (VHE; ≳100 giga-electron volts) gamma rays from the recurrent nova RS Ophiuchi, up to 1 month after its 2021 outburst, observed using the High Energy Stereoscopic System (H.E.S.) as mentioned in this paper .
Abstract: Recurrent novae are repeating thermonuclear explosions in the outer layers of white dwarfs, due to the accretion of fresh material from a binary companion. The shock generated when ejected material slams into the companion star’s wind can accelerate particles. We report very-high-energy (VHE; ≳100 giga–electron volts) gamma rays from the recurrent nova RS Ophiuchi, up to 1 month after its 2021 outburst, observed using the High Energy Stereoscopic System (H.E.S.S.). The temporal profile of VHE emission is similar to that of lower-energy giga–electron volt emission, indicating a common origin, with a 2-day delay in peak flux. These observations constrain models of time-dependent particle energization, favoring a hadronic emission scenario over the leptonic alternative. Shocks in dense winds provide favorable environments for efficient acceleration of cosmic rays to very high energies. Description Proton acceleration in a recurrent nova If a white dwarf strips material from a companion star, then enough hydrogen can build up on the surface to trigger a thermonuclear explosion, ejecting material without destroying the white dwarf. This is observed as a nova. Some novae have been seen to emit high-energy gamma rays, but the origin of that emission has been unclear. The H.E.S.S. Collaboration observed the 2021 outburst of RS Ophiuchi, a recurrent nova, determining its spectral and temporal evolution at giga–electron volt and tera–electron volt energies. Modeling of the emission physics shows that the expanding nova shock wave efficiently accelerated protons, providing a source of gamma rays and cosmic rays. —KTS Gamma-ray observations of the recurrent nova RS Ophiuchi demonstrate acceleration of protons to tera–electron volt energies.
60 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2026 | 2 |
| 2025 | 309 |
| 2024 | 514 |
| 2023 | 436 |
| 2022 | 782 |
| 2021 | 62 |