The General Picture

2015 ◽  
pp. 1-8
Keyword(s):  
General Picture

scholarly journals FEBID 3D-Nanoprinting at Low Substrate Temperatures: Pushing the Speed While Keeping the Quality

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1527
Author(s):  
Jakob Hinum-Wagner ◽  
David Kuhness ◽  
Gerald Kothleitner ◽  
Robert Winkler ◽  
Harald Plank
Keyword(s):  
Volume Growth ◽  
Point Of View ◽  
High Fidelity ◽  
Direct Write ◽  
General Picture ◽  
3D Space ◽  
Design Flexibility ◽  
Substrate Temperatures ◽  
Very High ◽  
Comprehensive Discussion

High-fidelity 3D printing of nanoscale objects is an increasing relevant but challenging task. Among the few fabrication techniques, focused electron beam induced deposition (FEBID) has demonstrated its high potential due to its direct-write character, nanoscale capabilities in 3D space and a very high design flexibility. A limitation, however, is the low fabrication speed, which often restricts 3D-FEBID for the fabrication of single objects. In this study, we approach that challenge by reducing the substrate temperatures with a homemade Peltier stage and investigate the effects on Pt based 3D deposits in a temperature range of 5–30 °C. The findings reveal a volume growth rate boost up to a factor of 5.6, while the shape fidelity in 3D space is maintained. From a materials point of view, the internal nanogranular composition is practically unaffected down to 10 °C, followed by a slight grain size increase for even lower temperatures. The study is complemented by a comprehensive discussion about the growth mechanism for a more general picture. The combined findings demonstrate that FEBID on low substrate temperatures is not only much faster, but practically free of drawbacks during high fidelity 3D nanofabrication.

scholarly journals First Principles Calculations of Defects in Unstable Crystals: Austenitic Iron

2011 ◽  
Vol 1363 ◽  
Author(s):  
G.J. Ackland ◽  
T.P.C. Klaver ◽  
D.J. Hepburn
Keyword(s):  
Point Defects ◽  
First Principles ◽  
Defect Formation ◽  
Single Layer ◽  
Temperature Limit ◽  
Reference State ◽  
First Principles Calculations ◽  
General Picture ◽  
Bcc Iron ◽  
Defect Energies

ABSTRACTFirst principles calculations have given a new insight into the energies of point defects in many different materials, information which cannot be readily obtained from experiment. Most such calculations are done at zero Kelvin, with the assumption that finite temperature effects on defect energies and barriers are small. In some materials, however, the stable crystal structure of interest is mechanically unstable at 0K. In such cases, alternate approaches are needed. Here we present results of first principles calculations of austenitic iron using the VASP code. We determine an appropriate reference state for collinear magnetism to be the antiferromagnetic (001) double-layer (AFM-d) which is both stable and lower in energy than other possible models for the low temperature limit of paramagnetic fcc iron. Another plausible reference state is the antiferromagnetic (001) single layer (AFM-1). We then consider the energetics of dissolving typical alloying impurities (Ni, Cr) in the materials, and their interaction with point defects typical of the irradiated environment. We show that the calculated defect formation energies have fairly high dependence on the reference state chosen: in some cases this is due to instability of the reference state, a problem which does not seem to apply to AFM-d and AFM-1. Furthermore, there is a correlation between local free volume magnetism and energetics. Despite this, a general picture emerge that point defects in austenitic iron have geometries similar to those in simpler, non-magnetic, thermodynamically stable FCC metals. The defect energies are similar to those in BCC iron. The effect of substitutional Ni and Cr on defect properties is weak, rarely more than tenths of eV, so it is unlikely that small amounts of Ni and Cr will have a significant effect on the radiation damage in austenitic iron at high temperatures.

scholarly journals A NON-GEODESIC MOTION IN THE R-1 THEORY OF GRAVITY TUNED WITH OBSERVATIONS

2008 ◽  
Vol 23 (02) ◽  
pp. 109-114 ◽  
Author(s):  
CHRISTIAN CORDA
Keyword(s):  
Dark Matter ◽  
High Order ◽  
Ricci Scalar ◽  
Geodesic Motion ◽  
General Picture ◽  
Test Particles ◽  
Pioneer Anomaly ◽  
Theories Of Gravity ◽  
Theory Of Gravity

In the general picture of high order theories of gravity, recently, the R-1 theory has been analyzed in two different frameworks. In this letter a third context is added, considering an explicit coupling between the R-1 function of the Ricci scalar and the matter Lagrangian. The result is a non-geodesic motion of test particles which, in principle, could be connected with Dark Matter and Pioneer anomaly problems.

Chronlogy of the Bamenda Grassfields

1970 ◽  
Vol 11 (2) ◽  
pp. 249-257 ◽  
Author(s):  
E. M. Chilver ◽  
P. M. Kaberry
Keyword(s):  
Ministry Of Education ◽  
Occupational Structure ◽  
General Picture ◽  
Demographic Survey

In 1964 the Bamenda Grassfields, then composed of the three West Cameroon prefectures of Bamenda, Wum and Nkambe, had a population of almost 575,000, which was densest in the Bamenda prefecture, adjoining the populous Bamileke prefectures. By 1967 these three prefectures had been increased to five–Bamenda, Gwofon, Nso, Wum and Nkambe– by division of the former Bamenda prefecture into three (Bamenda, Gwofon and Nso) and the addition to Gwofon of the Widekum-Menka area formerly administered as part of Mamfe Division. The distribution and age and occupational structure of the population are discussed in The Population of West Cameroon: Main Findings of the 1964 Sample Demographic Survey (Ministry of Economic Affairs and Planning, 1966). A census was carried out by the British administering authorities in 1953, based on socalled ‘clan areas’—a misnomer. The general picture given in administrative reports and reproduced in the 1953 census ethnic categories was of the broad division of the region into Tikar, Chamba (Bali), Tiv (Munshi) and Widekum, with small refugee enclaves on the northern borders. The significance and doubtful validity of these categories will be discussed in our forthcoming contribution to the Histoire des peuples et civilisations du Cameroun (ed. Claude Tardits), and are dealt with in some detail in E. M. Chilver and P. M. Kaberry, Notes on the Precolonial History and Ethnography of the Bamenda Grassfields (cyclostyled, 1966, for the Ministry of Education, West Cameroon).

scholarly journals ‘Negative’ surface differential rotation in stars having low Coriolis numbers (slow rotation or high turbulence)

2009 ◽  
Vol 5 (S264) ◽  
pp. 219-221 ◽  
Author(s):  
Kwing L. Chan
Keyword(s):  
Differential Rotation ◽  
Three Dimensional ◽  
Slow Rotation ◽  
General Picture ◽  
Cool Stars ◽  
Negative Surface ◽  
High Turbulence ◽  
The Mean ◽  
Key Parameter ◽  
Three Dimensional Simulations

AbstractA general picture of differential rotation in cool stars is that they are ‘solar-like’, with the equator spinning faster than the poles. Such surface differential rotation profiles have also been demonstrated by some three-dimensional simulations. In our numerical investigation of rotating convection (both regional and global), we found that this picture is not universally applicable. The equator may spin substantially slower than the poles (Ωequator − Ωpole)/Ω can reach −50%). The key parameter that determines the transition in behavior is the Coriolis number (inverse Rossby number). ‘Negative’ differential rotation of the equator (relative to the mean rotation) occurs if the Coriolis number is below a critical value.

Learning Morality with Siblings: The Untold Tale of a Mid-Twentieth Century Taiwanese Family

2021 ◽  
pp. 1-27
Author(s):  
Jing Xu
Keyword(s):  
Training Model ◽  
Sibling Relationship ◽  
Text Analytics ◽  
Chinese Families ◽  
General Picture ◽  
Projective Tests ◽  
Moral Learning ◽  
Peer Community ◽  
Ethnographic Analysis

Abstract This article uses a new theoretical and methodological framework to reconstruct a story of two children from fieldnotes collected by anthropologists Arthur and Margery Wolf in rural Taiwan (1958 to 1960). Through the case of a brother–sister dyad, it examines the moral life of young children and provides a rare glimpse into sibling relationship in peer and family contexts. First, combining social network analysis and NLP text-analytics, this article introduces a general picture of these siblings’ life in the peer community. Moreover, drawing from naturalistic observations and projective tests, it offers an ethnographic analysis of how children support each other and assert themselves. It emphasizes the role of child-to-child ties in moral learning, in contrast to the predominant focus of parent–child ties in the study of Chinese families. It challenges assumptions of the Chinese “child training” model and invites us to take children's moral psychology seriously and re-discover their agency.

Frege

2021 ◽  
Author(s):  
Charles Travis
Keyword(s):  
General View ◽  
General Picture ◽  
The World

This book is about Frege and his contribution to philosophy. It has three parts. Part I presents his general picture of thought, that is, the object of a capacity for thought (what may be thought). The point is to stress the value of separating the business of being true from thinkers’ engagement with such business, thus from issues specifically about language, and this as a model for philosophy in general. It also expands on Frege’s case for the intrinsic publicity (sharability) of thought. Part II concerns some particular developments of the general view made by Frege with a view to serving the needs of his central project (after logic itself): showing arithmetic to be logic. Part III applies the general picture in presenting a view of truth (and its irreducibility), logic of logic’s independence both of thinkers and of the world (its indifference to anything in how things happen to be), and of objectivity.

‘The moral in the story’: a diachronic investigation of lexicalised morality in the UK press

Corpora ◽  
2010 ◽  
Vol 5 (2) ◽  
pp. 161-189 ◽  
Author(s):  
Anna Marchi
Keyword(s):  
Recent History ◽  
Moral Issue ◽  
General Picture ◽  
Qualitative Approaches ◽  
The Press ◽  
Discourse Studies ◽  
Lexical Items ◽  
The Uk ◽  
Access Patterns

In this paper, I explore the discourses surrounding whatever is explicitly identified as a moral issue in the SiBol corpora. This analysis is mainly diachronic but will combine a variety of parameters in order to access patterns of change/stability across different newspapers, within a single newspaper in time, across different news types, across topics and in the broader context of recent history. I adopt the Corpus-Assisted Discourse Studies (CADS) 2 2 See: http://en.wikipedia.org/wiki/Corpus-assisted_discourse_studies methodology – merging, and shunting between, quantitative and qualitative approaches. The analysis investigates morality-related lexical items, their collocations, the surrounding contexts, and the news items and topics they are framed within, in an attempt to offer a general picture of the topic, while also aiming to provide an in-depth understanding of what the press means or projects by moral.

A Study of Polymers. II. Dynamic Method of Studying Elastic Materials

1940 ◽  
Vol 13 (4) ◽  
pp. 898-904 ◽  
Author(s):  
Yu S. Lazurkin
Keyword(s):  
Elastic Deformation ◽  
Dynamic Tests ◽  
Elastic Materials ◽  
General Picture ◽  
High Frequencies ◽  
Dynamic Conditions ◽  
Automobile Tire ◽  
General Law ◽  
Long Time ◽  
Time Required

Abstract Most articles made from elastic substances are intended for service under dynamic conditions. Static methods of investigation are clearly insufficient for determining the behavior of elastic substances under dynamic conditions and therefore there has for a long time been a need for dynamic tests. In recent years several dynamic tests have been developed, and a number of investigations of elastic properties under dynamic conditions have been published. The works of Frumkin, Roelig, Kosten, Naunton and Waring and other investigators have established a series of relations in the behavior of elastic substances under dynamic conditions. However, the limited intervals of frequency and temperature in these experiments gave relations of peculiar character and even led to contradictions. Thus Naunton and Waring showed that, under dynamic conditions (at high frequencies), automobile tire casings act as solid hoops and, according to Roelig and Kosten, the relation between modulus and frequency, though still existing, is of relatively little importance. The development of a concept of the mechanism of highly elastic deformation, and in particular the disclosure of relaxation made it possible for Kornfel'd and Poznyak and Mikhai˘lov and Kirilina to demonstrate experimentally the existence of a more general law relating the phenomena. However, in their experiments, the frequency in both cases changed within narrow limits, and consequently these investigations too do not give a general picture of the behavior of elastic materials in relation to the frequency of deformation and temperature. The idea of highly elastic deformation, as well as that of relaxation, comes down to the fact that the magnitudes of the deformations observed depend on the relation between the time of action of the force and the time required for regrouping of the particles in the substance during the deformation.

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