scholarly journals Perovskite LEDs

2019 ◽  
Vol 1 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Richard H. Friend ◽  
Dawei Di ◽  
Samuele Lilliu ◽  
Baodan Zhao

Sir Richard H. Friend is Cavendish Professor of Physics at the University of Cambridge. In the 1990s, he reported for the first time efficient operation of polymer based FET and LED, which contributed to the commercialisation of OLED displays employed in current TV and smartphone devices. He is co-founder of several companies and start-ups including Cambridge Display Technology, Plastic Logic, and Heliochrome limited. In this interview, he and Dr. Dawei Di, who recently joined Zhejiang University in China as a tenure-track professor, discuss recent developments and future prospects of perovskite LED research and development. The interview is available at https://youtu.be/Fjcm4V36U2A

1945 ◽  
Vol 153 (1) ◽  
pp. 113-132
Author(s):  
D. F. Galloway

Despite the introduction of comparatively new manufacturing processes such as powder metallurgy and plastics which are gradually assuming their true functions in industry, manipulation of metals by machining still occupies a place of major importance among methods of production and the efficiency with which machining operations are carried out continues to influence greatly the overall industrial efficiency of the country. Research provides a means of greatly accelerating progress toward the goal of efficient metal machining, and recent developments in other fields of science and industry now present opportunities of research and development in metal machining, incomparably greater than have hitherto been known. The progress recently made in the field of surface finish measurement which, for the first time, makes possible a rational investigation of finish machining operations, is just one example of newly acquired knowledge which can now be applied in solving the complex problems of metal machining.


2015 ◽  
Vol 58 (4) ◽  
pp. 901-930 ◽  
Author(s):  
DAVID MAXWELL

AbstractThis article is a revised and expanded version of my inaugural lecture as Dixie Professor of Ecclesiastical History at the University of Cambridge, delivered on 12 March 2014. It highlights the evolution of Ecclesiastical History to include the study of Christianity in the global south and shows how recent developments in the study of African and world history have produced a dynamic and multi-faceted model of religious encounter, an encounter which includes the agency of indigenous Christians alongside the activities of missionaries. Investigating the contribution of faith missionaries to the production of colonial knowledge in Belgian Congo, the article challenges stereotypes about the relations between Pentecostalism and modernity, and between mission and empire. Throughout, consideration is given to the range of missionary sources, textual, visual, and material, and their utility in reconstructing social differentiation in African societies, particularly in revealing indigenous African criticism of ‘custom’.


1996 ◽  
Vol 10 (1) ◽  
pp. 37-42
Author(s):  
Colin Biggs ◽  
Robin Brighton ◽  
Rachel Clark

This article provides an overview of recent developments in the UK aimed at building learning alliances between universities and other higher education institutions, and employers. It begins by reviewing briefly the fuller range of types of linkages which can and do exist between higher education and industry, and what is driving them, and then focuses more specifically on teaching and the curriculum. The article exemplifies something of the plethora of effective linkages being developed in the UK, paying particular attention to the University of Warwick model, and discusses the factors which make success more likely. It also discusses the costs and benefits of linkage programmes for the interested parties. The article concludes by raising a variety of key issues which are currently presented by university—industry partnerships, and in the light of this discussion sets out some thoughts on future prospects for linkage programmes. While these latter speculations are made for the UK, it is likely that they will be relevant for many other countries undergoing similar sea-changes concerning the nature of work and training.


1981 ◽  
Vol 18 (01) ◽  
pp. 10-21
Author(s):  
Robert Latorre ◽  
Frederick Ashcroft

Estimating resistance and course stability is a twofold problem confronting the barge designer. This paper discusses recent Japanese research and development work on the towing resistance of simple hull forms, skeg design, and the relationship between skeg lift and towed barges' course stability. The University of Michigan's experience from numerous tank tests of oceangoing barge models with notched sterns is summarized, and a design aid to make preliminary resistance estimates for stern notches of various sizes is presented.


2012 ◽  
Vol 58 ◽  
pp. 299-325 ◽  
Author(s):  
Richard A. Fortey

Harry Whittington was a palaeontologist of distinction who progressed through academic life from a modest background in the Midlands to become an authority on trilobites, and was the scientist who led the re-evaluation of the Cambrian faunas of the Burgess Shale. His studies of silicified trilobites revealed an array of previously unknown morphological details, and identified larval features of many species for the first time, with implications for the classification of the group as a whole. He recognized patterns in the distribution of Ordovician trilobites that anticipated a revolution in palaeobiogeography after the application of plate tectonic theory to the Lower Palaeozoic. The Burgess Shale project cast new light on the early evolution of complex life on Earth. Whittington had a career of exceptional longevity, which reached its acme long after the age of normal retirement and continued almost without a break to his ninetieth year. He was a professor both at Harvard University and in the University of Cambridge, and inspired a generation of palaeontologists who became well known in their own right. His meticulous reconstructions of Cambrian animals, based on his insistence on facts before speculation, revealed the morphological complexity that was already present in the Cambrian world, especially among arthropods, and provided evidence of curious designs that seemed to be far removed from those of organisms still living. He set the standard for the description and naming of organisms preserved in Konservat-Lagerstätten , those rare occurrences with fossils of soft-bodied organisms. The origination of the major living animal groups by the Cambrian was established by this work, which documented the Cambrian evolutionary ‘explosion’ in detail for the first time.


Antiquity ◽  
1999 ◽  
Vol 73 (280) ◽  
pp. 377-393 ◽  
Author(s):  
Michael Thomspson ◽  
Colin Renfrew

The beautifully illustrated catalogues of Lieutenant General Pitt-Rivers collections at Farnham have recently been presented to the University of Cambridge — where they will be in the public domain for the first time. The background to the collections and their catalogues is an intriguing story, showing the precision and detail demanded by Pitt-Rivers for his Farnham Museum. We are pleased to present some examples here, printed in colour and showing the range of the Victorian collector par excellence.


Author(s):  
S.J. Krause ◽  
W.W. Adams

Over the past decade low voltage scanning electron microscopy (LVSEM) of polymers has evolved from an interesting curiosity to a powerful analytical technique. This development has been driven by improved instrumentation and in particular, reliable field emission gun (FEG) SEMs. The usefulness of LVSEM has also grown because of an improved theoretical and experimental understanding of sample-beam interactions and by advances in sample preparation and operating techniques. This paper will review progress in polymer LVSEM and present recent results and developments in the field.In the early 1980s a new generation of SEMs produced beam currents that were sufficient to allow imaging at low voltages from 5keV to 0.5 keV. Thus, for the first time, it became possible to routinely image uncoated polymers at voltages below their negative charging threshold, the "second crossover", E2 (Fig. 1). LVSEM also improved contrast and reduced beam damage in sputter metal coated polymers. Unfortunately, resolution was limited to a few tenths of a micron due to the low brightness and chromatic aberration of thermal electron emission sources.


2013 ◽  
Vol 40 (2) ◽  
pp. 244-256 ◽  
Author(s):  
Holger Funk

In the history of botany, Adam Zalužanský (d. 1613), a Bohemian physician, apothecary, botanist and professor at the University of Prague, is a little-known personality. Linnaeus's first biographers, for example, only knew Zalužanský from hearsay and suspected he was a native of Poland. This ignorance still pervades botanical history. Zalužanský is mentioned only peripherally or not at all. As late as the nineteenth century, a researcher would be unaware that Zalužanský’s main work Methodi herbariae libri tres actually existed in two editions from two different publishers (1592, Prague; 1604, Frankfurt). This paper introduces the life and work of Zalužanský. Special attention is paid to the chapter “De sexu plantarum” of Zalužanský’s Methodus, in which, more than one hundred years before the well-known De sexu plantarum epistola of R. J. Camerarius, the sexuality of plants is suggested. Additionally, for the first time, an English translation of Zalužanský’s chapter on plant sexuality is provided.


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