scholarly journals B (1). Local Structure: Distribution of Different Types of Stars in the Plane

1955 ◽  
Vol 1 ◽  
pp. 25-30
Keyword(s):  
Density Distribution ◽  
Local Structure ◽  
Large Scale ◽  
Milky Way ◽  
Space Distribution ◽  
The Past ◽  
Different Types ◽  
Insight Into

Numerous extensive studies of the space distribution of stars of different spectral types, based on star counts and colour measures, have in the past been published for different sections of the Milky Way.1 These studies have given information on the nearby obscuring clouds, and they have revealed marked differences between the distribution of different kinds of stars. They have not, however, given us the much desired insight into the large-scale features of the density distribution.

scholarly journals Address of the President Sir Henry Dale, C.B.E., at the Anniversary Meeting, 1 December 1941

1942 ◽  
Vol 179 (978) ◽  
pp. 233-260 ◽  
Keyword(s):  
Technical College ◽  
High Speed ◽  
Large Scale ◽  
Electrical Engineering ◽  
The United States ◽  
The Past ◽  
Pure Mathematics ◽  
Symbolic Structure ◽  
The Church ◽  
Insight Into

This is the first occasion on which I have had the great honour of addressing the Royal Society on this anniversary of its foundation. According to custom, I begin with brief mention of those whom death has taken from our Fellowship during the past year, and whose memories we honour. Alfred Young (1873-1940), distinguished for his contributions to pure mathematics, was half brother to another of our Fellows, Sydney Young, a chemist of eminence. Alfred Young had an insight into the symbolic structure and manipulation of algebra, which gave him a special place among his mathematical contemporaries. After a successful career at Cambridge he entered the Church, and passed his later years in the country rectory of Birdbrook, Essex. His devotion to mathematics continued, however, throughout his life, and he published a steady stream of work in the branch of algebra which he had invented, and named ‘quantitative substitutional analysis’. He lived to see his methods adopted by Weyl in his quantum mechanics and spectroscopy. He was elected to our Fellowship in 1934. With the death of Miles Walker (1868-1941) the Society loses a pioneer in large-scale electrical engineering. Walker was a man of wide interests. He was trained first for the law, and even followed its practice for a period. Later he studied electrical engineering under Sylvanus Thompson at the Finsbury Technical College and became his assistant for several years. Thereafter, encouraged by Thompson, he entered St John’s College, Cambridge, with a scholarship, and graduated with 1st Class Honours in both the Natural Sciences and the Engineering Tripos. Having entered the service of the British Westinghouse Company, he was sent by them to the United States of America to study electrical engineering with the parent company in Pittsburgh. On his return to England he became their leading designer of high-speed electrical generators

scholarly journals Chronic Myelomonocytic Leukemia—Hematopathology Perspective

2021 ◽  
Author(s):  
Siba El Hussein ◽  
Sa A. Wang ◽  
Naveen Pemmaraju ◽  
Joseph D. Khoury ◽  
Sanam Loghavi
Keyword(s):  
Risk Stratification ◽  
Large Scale ◽  
Chronic Myelomonocytic Leukemia ◽  
Clinical Implications ◽  
The Past ◽  
Genomic Landscape ◽  
Sequencing Studies ◽  
Myelomonocytic Leukemia ◽  
Insight Into

ABSTRACT Our understanding of chronic myelomonocytic leukemia (CMML) has evolved tremendously over the past decade. Large-scale sequencing studies have led to increased insight into the genomic landscape of CMML and clinical implications of these changes. This in turn has resulted in refined and improved risk stratification models, which to date remain versatile and subject to remodeling, as new and evolving studies continue to refine our understanding of this disease. In this article, we present an up-to-date review of CMML from a hematopathology perspective, while providing a clinically practical summary that sheds light on the constant evolution of our understanding of this disease.

Thermal Transport Across Carbon Nanotube Connected by Molecular Linkers

2011 ◽  
Author(s):  
Jun Liu ◽  
Mohamed Alhashme ◽  
Ronggui Yang
Keyword(s):  
Thermal Transport ◽  
Large Scale ◽  
Normal Modes ◽  
Thermal Conductance ◽  
Nonequilibrium Molecular Dynamics ◽  
Practical Application ◽  
The Past ◽  
Interfacial Thermal Conductance ◽  
Macro Scale ◽  
Different Types

Carbon nanotubes (CNTs) have been reported to have excellent thermal and mechanical properties over the past two decades. However, the practical application of CNT-based technologies has been limited, due to the inability to transform the excellent properties of single CNTs into macroscopic applications. CNT network structure connects CNTs and can be possibly scaled up to macro-scale CNT-based application. In this paper, nonequilibrium molecular dynamics is applied to investigate thermal transport across two CNTs connected longitudinally by molecular linkers. We show the effect of different types and lengths of molecular linkers on interfacial thermal conductance. We also analyze the density of vibrational normal modes to further understand the interfacial thermal conductance between different molecular linkers and CNTs. These results provide guidance for choosing molecular linkers to build up large-scale CNT-based network structures.

scholarly journals The implications of clustered star formation for (proto)planetary systems and habitability

2018 ◽  
Vol 14 (S345) ◽  
pp. 61-65
Author(s):  
J. M. Diederik Kruijssen ◽  
Steven N. Longmore
Keyword(s):  
Star Formation ◽  
Large Scale ◽  
Milky Way ◽  
Planetary Systems ◽  
Habitable Zone ◽  
Stellar Clusters ◽  
Galaxy Mergers ◽  
Multi Scale ◽  
The Past ◽  
Scale Properties

AbstractStar formation is spatially clustered across a range of environments, from dense stellar clusters to unbound associations. As a result, radiative or dynamical interactions with neighbouring stars disrupt (proto)planetary systems and limit their radii, leaving a lasting impact on their potential habitability. In the solar neighbourhood, we find that the vast majority of stars form in unbound associations, such that the interaction of (proto)planetary systems with neighbouring stars is limited to the densest sub-regions. However, the fraction of star formation occurring in compact clusters was considerably higher in the past, peaking at ∼50% in the young Milky Way at redshift z ∼ 2. These results demonstrate that the large-scale star formation environment affects the demographics of planetary systems and the occupation of the habitable zone. We show that planet formation is governed by multi-scale physics, in which Mpc-scale events such as galaxy mergers affect the AU-scale properties of (proto)planetary systems.

scholarly journals The Role of Public-Private Partnerships in Higher Education How Tertiary Institutions in emerging Economies benefit from Public-Private Partnerships

2017 ◽  
Vol 2 (1) ◽  
pp. 1-7
Author(s):  
Ronak Warasthe
Keyword(s):  
Higher Education ◽  
Emerging Economies ◽  
Tertiary Education ◽  
Added Value ◽  
Public Private Partnerships ◽  
Tertiary Institutions ◽  
The Past ◽  
Different Types ◽  
Insight Into

Abstract The number of Public-Private Partnerships in the education sector is growing in developing and emerging economies. Traditionally governments are the main financial contributor to education however, the involvement of the private sector is an increasing one. While more established in primary and secondary education, PPPs in tertiary education are a phenomenon rather slowly growing in the past decades (Patrinos, Barrera-Osorio, & Guaqueta, 2009). There are various concepts of PPPs in higher education each targeting different goals. In order to give an insight into different types of PPPs, the typology according to Mabizela has been briefly displayed and the case of a PPP in Namibia is given. The framework of the partnership was compiled to give an outlook on the practicability of partnerships. The paper exemplifies that both partners within a PPP can benefit from the added value they may generate for their target group. Thus, the benefit depends on quality, relevance and execution of the partnership.

Archive Everything

2016 ◽  
Author(s):  
Gabriella Giannachi
Keyword(s):  
Social Media ◽  
Industrial Revolution ◽  
Social Groups ◽  
The Internet ◽  
Web Based ◽  
The Past ◽  
Different Types ◽  
The Internet Of Things ◽  
Insight Into ◽  
The Way

This book traces the evolution of the archive across the centuries by looking at primitive, Medieval, Renaissance, Victorian and contemporary archives. Crucially, the book evidences the fluidity and potential inter-changeability between libraries, archives and museums. A number of case studies offer an insight into the operation of a variety of different types of archives, including cabinets of curiosity, archival artforms, architectures, performances, road-shows, time capsules, social media documentation practices, databases, and a variety of museological web-based heritage platforms. The archive is shown to play a crucial role in how individuals and social groups administer themselves through and within a burgeoning social memory apparatus. This is why at the heart of every industrial revolution thus far, the archive continues to contribute to the way we store, preserve and generate knowledge through an accumulation of documents, artifacts, objects, as well as ephemera and even debris. The archive has always been strategic for different types of economies, including the digital economy and the internet of things. Shown here to increasingly affect to the way we map, produce, and share knowledge, the apparatus of the archive, which allows us to continuously renew who we are in relation to the past, so that new futures may become possible, now effectively pervades almost every aspect of our lives.

3. Stellar Studies of Local Galactic Structure

1988 ◽  
Vol 20 (01) ◽  
pp. 381-382
Keyword(s):  
Local Structure ◽  
Milky Way ◽  
Local Density ◽  
Interstellar Extinction ◽  
The Sun ◽  
Space Density ◽  
Halo Stars ◽  
Luminosity Functions ◽  
Different Types ◽  
The Galaxy

This subsection reports results on the existence and nature of the possible unseen matter near the Sun, the local density of disc and halo stars, the respective luminosity functions and the local distributions of some special type objects. It summarizes work relating to the space density of stars of different types in the plane of the Galaxy and dealing with photometric stellar studies in the Milky Way fields of strong interstellar extinction. It also reviews galactic models relevant to the local structure.

scholarly journals The GALAH survey and Gaia DR2: Linking ridges, arches, and vertical waves in the kinematics of the Milky Way

2019 ◽  
Vol 489 (4) ◽  
pp. 4962-4979 ◽  
Author(s):  
Shourya Khanna ◽  
Sanjib Sharma ◽  
Thor Tepper-Garcia ◽  
Joss Bland-Hawthorn ◽  
Michael Hayden ◽  
...  
Keyword(s):  
Large Scale ◽  
Milky Way ◽  
Dwarf Galaxy ◽  
Elemental Abundance ◽  
Space Distribution ◽  
Orbital Energy ◽  
Small Scale ◽  
Constant Energy ◽  
Third Dimension ◽  
Gaia Dr2

ABSTRACT Gaia DR2 has revealed new small-scale and large-scale patterns in the phase-space distribution of stars in the Milky Way. In cylindrical Galactic coordinates $(R,\phi ,z)$, ridge-like structures can be seen in the $(R,V_\phi)$ plane and asymmetric arch-like structures in the $(V_R,V_\phi)$ plane. We show that the ridges are also clearly present when the third dimension of the $(R,V_\phi)$ plane is represented by $\langle z \rangle$, $\langle V_z \rangle$, $\langle V_R \rangle$, $\langle$[Fe/H]$\rangle$, and $\langle [\alpha /{\rm Fe}]\rangle$. The maps suggest that stars along the ridges lie preferentially close to the Galactic mid-plane ($|z|\lt 0.2$ kpc), and have metallicity and $\alpha$ elemental abundance similar to that of the Sun. We show that phase mixing of disrupting spiral arms can generate both the ridges and the arches. It also generates discrete groupings in orbital energy – the ridges and arches are simply surfaces of constant energy. We identify eight distinct ridges in the Gaia DR2 data: six of them have constant energy while two have constant angular momentum. Given that the signature is strongest for stars close to the plane, the presence of ridges in $\langle z \rangle$ and $\langle V_z \rangle$ suggests a coupling between planar and vertical directions. We demonstrate, using N-body simulations that such coupling can be generated both in isolated discs and in discs perturbed by an orbiting satellite like the Sagittarius dwarf galaxy.

scholarly journals Tracking On-Surface Chemistry with Atomic Precision

Synlett ◽  
2017 ◽  
Vol 28 (19) ◽  
pp. 2509-2516 ◽  
Author(s):  
Peter Jacobse ◽  
Marc-Etienne Moret ◽  
Robertus Klein Gebbink ◽  
Ingmar Swart
Keyword(s):  
Atomic Force Microscopy ◽  
Single Molecule ◽  
Graphene Nanoribbons ◽  
Single Molecule Level ◽  
Force Microscopy ◽  
The Past ◽  
Atomic Force ◽  
Atomic Precision ◽  
Different Types ◽  
Insight Into

The field of on-surface synthesis has seen a tremendous development in the past decade as an exciting new methodology towards atomically well-defined nanostructures. A strong driving force in this respect is its inherent compatibility with scanning probe techniques, which allows one to ‘view’ the reactants and products at the single-molecule level. In this article, we review the ability of noncontact atomic force microscopy to study on-surface chemical reactions with atomic precision. We highlight recent advances in using noncontact atomic force microscopy to obtain mechanistic insight into reactions and focus on the recently elaborated mechanisms in the formation of different types of graphene nanoribbons.

scholarly journals Tales from the Supplementary Information: Ancestry Change in Chalcolithic–Early Bronze Age Britain Was Gradual with Varied Kinship Organization

2021 ◽  
pp. 1-22
Author(s):  
Thomas J. Booth ◽  
Joanna Brück ◽  
Selina Brace ◽  
Ian Barnes
Keyword(s):  
Bronze Age ◽  
Large Scale ◽  
Genetic Relatedness ◽  
Genetic Relationships ◽  
Supplementary Information ◽  
Early Bronze Age ◽  
Social Meaning ◽  
Rapid Process ◽  
The Past ◽  
Insight Into

Large-scale archaeogenetic studies of people from prehistoric Europe tend to be broad in scope and difficult to resolve with local archaeologies. However, accompanying supplementary information often contains useful finer-scale information that is comprehensible without specific genetics expertise. Here, we show how undiscussed details provided in supplementary information of aDNA papers can provide crucial insight into patterns of ancestry change and genetic relatedness in the past by examining details relating to a >90 per cent shift in the genetic ancestry of populations who inhabited Chalcolithic and Early Bronze Age Britain (c. 2450–1600 bc). While this outcome was certainly influenced by movements of communities carrying novel ancestries into Britain from continental Europe, it was unlikely to have been a simple, rapid process, potentially taking up to 16 generations, during which time there is evidence for the synchronous persistence of groups largely descended from the Neolithic populations. Insofar as genetic relationships can be assumed to have had social meaning, identification of genetic relatives in cemeteries suggests paternal relationships were important, but there is substantial variability in how genetic ties were referenced and little evidence for strict patrilocality or female exogamy.

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