181 research outputs found
The postman [music] /
No full textFor voice with piano.; Cover title.; Cover features image of a postman walking by a letter box, carrying his whistle in one hand and a bundle of letters in the other. "PMG" can be seen on his hat and jacket.; Publication date approximated from the Sydney morning herald, 17 December, 1949, Column 8, p. 1 (http://nla.gov.au/nla.news-article18140283).; Also available online http://nla.gov.au/nla.mus-vn5978911
Twelve technology tools to design and optimise the production chain from resources to product
No full textЗв\u27язок алгебраїчних рівнянь з -формами, їх степенями і рекурентними дробами
No full textAlgebraic and recursion equations are widely used in different areas of mathematics, so various objects and methods of research that are associated with them are very important. In this article we investigate the relationship between -forms with generalized Diophantine Pell\u27s equation, algebraic equations of degree and recurrent fractions. The properties of the -forms and their characteristic equation are considered. The author applied parafunctions of triangular matrices to the study of algebraic equations and corresponding recurrence equations. The form of adjacent roots of the annihilating polynomial of arbitrary -forms over the field of rational numbers are explored.
The following question is very important for some applied problems: Is a given form the largest by module among its adjacent roots? If it is so, then there is a periodic recurrence fraction of -order that is equal to this -form, and its th rational shortening will be its rational approximation. The author has identified the class -forms with the largest module among their adjacent roots and showed how to find periodic recurrence fractions of -order and rational approximations for them.Алгебраїчні та рекурентні рівняння мають широке застосування не тільки в алгебрі, але й в інших розділах математики, чим викликають неабияке зацікавлення до різного роду об\u27єктів та методів дослідження пов\u27язаних із ними. В цій статті досліджено зв\u27язок -форм з узагальненими рівняннями Пеля, алгебраїчними рівняннями -ого степеня і рекурентними дробами. Розглянуто властивості -форми і її характеристичного рівняння. Застосовано парафункції трикутних матриць до алгебраїчних рівнянь -ого степеня та відповідних їм рекурентних рівнянь. Досліджено вигляд суміжних коренів анулюючого полінома довільної -форми над полем раціональних чисел.
Для деяких прикладних задач велике значення має відповідь на питання: чи є дана -форма найбільша за модулем серед своїх суміжних коренів? Тоді в цьому випадку існуватиме одноперіодичний рекурентний дріб -ого порядку, який дорівнюватиме даній -формі, а його -те раціональне вкорочення буде її раціональним наближенням. Автор виділив клас -форм, які є найбільшими за модулем серед своїх суміжних коренів, та показав як для них знайти одноперіодичні рекурентні дроби -ого порядку й раціональні наближення
Field Stack in Minutes: No Velocity Picking, No Nmo Stretch
No full textMotivated by the ideas of automatic common-midpoint (CMP) stacking without normal-moveout (NMO) correction, hence NMO stretch, and automatizing the velocity model building, we propose a cross-correlation/cross-coherence-based approach. It is a two-step method where the first step is cross-correlation/cross-coherence of zero-offset traces with all other traces in corresponding CMP gathers. This step removes the NMO effect of different hyperbolic events, resulting in CMP gathers with flat events without any stretching effect. Following this, horizontal summation across different CMP gathers is done, resulting in a velocity-free data-driven production of time-domain stacked seismic section. The second step takes advantage of the cross-correlation lags via data-driven k-means cluster analysis to separate lags corresponding to individual hyperbolic events in the CMP gather into distinct clusters. Different norm fittings to lags within individual clusters are evaluated and the lowest residual one automatically selected, resulting in a velocity and zero-offset two-way traveltime time per cluster. These form a base to build an average velocity model for migration and time-to-depth conversion. We demonstrate the efficiency of the proposed method using synthetic and field shear-wave data acquired in southwestern Sweden.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Applied Geophysics and Petrophysic
Estimating Fully Observed Recursive Mixed-Process Models with cmp
No full textAt the heart of many econometric models is a linear function and a normal error. Examples include the classical small-sample linear regression model and the probit, ordered probit, multinomial probit, Tobit, interval regression, and truncateddistribution regression models. Because the normal distribution has a natural multidimensional generalization, such models can be combined into multi-equation systems in which the errors share a multivariate normal distribution. The literature has historically focused on multi-stage procedures for estimating mixed models, which are more efficient computationally, if less so statistically, than maximum likelihood (ML). But faster computers and simulated likelihood methods such as the Geweke, Hajivassiliou, and Keane (GHK) algorithm for estimating higherdimensional cumulative normal distributions have made direct ML estimation practical. ML also facilitates a generalization to switching, selection, and other models in which the number and types of equations vary by observation. The Stata module cmp fits Seemingly Unrelated Regressions (SUR) models of this broad family. Its estimator is also consistent for recursive systems in which all endogenous variables appear on the right-hand-sides as observed. If all the equations are structural, then estimation is full-information maximum likelihood (FIML). If only the final stage or stages are, then it is limited-information maximum likelihood (LIML). cmp can mimic a dozen built-in Stata commands and several user-written ones. It is also appropriate for a panoply of models previously hard to estimate. Heteroskedasticity, however, can render it inconsistent. This paper explains the theory and implementation of cmp and of a related Mata function, ghk2(), that implements the GHK algorithm.econometrics, cmp, GHK algorithm, seemingly unrelated regressions
Collection Management Policy (CMP): A Framework to Achieve Library Goals
No full textCMP is not a miraculous document that carries solutions to all kinds of collection related problems. But, it is far better to have one than not to have. It makes a complex and subjective process of CM less problematic by devising and documenting the philosophy behind a library’s collecting practice. It may serve as a detailed framework to execute the philosophy of a library. Thus, a written CMP has much more to offer to libraries in the digital and hybrid age-- an age which has mesmerized users with explicit and implicit perceptions regarding electronic resources
Biologically-Inspired Massively-Parallel Architectures - computing beyond a million processors
No full textThe SpiNNaker project aims to develop parallel computer systems with more than a million embedded processors. The goal of the project is to support largescale simulations of systems of spiking neurons in biological real time, an application that is highly parallel but also places very high loads on the communication infrastructure due to the very high connectivity of biological neurons. The scale of the machine requires fault-tolerance and power-efficiency to influence the design throughout, and the development has resulted in innovation at every level of design, including a self-timed inter-chip communication system that is resistant to glitch-induced deadlock and ‘emergency’ hardware packet re-routing around failed inter-chip links, through to run-time support for functional migration and real-time fault mitigatio
Innovative teaching of IC design and manufacture using the Superchip platform
No full textIn this paper we describe how an intelligent chip architecture has allowed a large cohort of undergraduate students to be given effective practical insight into IC design by designing and manufacturing their own ICs. To achieve this, an efficient chip architecture, the “Superchip”, has been developed, which allows multiple student designs to be fabricated on a single IC, and encapsulated in a standard package without excessive cost in terms of time or resources. We demonstrate how the practical process has been tightly coupled with theoretical aspects of the degree course and how transferable skills are incorporated into the design exercise. Furthermore, the students are introduced at an early stage to the key concepts of team working, exposure to real deadlines and collaborative report writing. This paper provides details of the teaching rationale, design exercise overview, design process, chip architecture and test regime
Analysis of the 3d massive renormalization group perturbative expansions: a delicate case
No full textThe effectiveness of the perturbative renormalization group approach at fixed space dimension d in the theory of critical phenomena is analyzed. Three models are considered: the O(N) model, the cubic model and the antiferromagnetic model defined on the stacked triangular lattice. We consider all models at fixed d = 3 and analyze the resummation procedures currently used to compute the critical exponents. We first show that, for the O(N) model, the resummation does not eliminate all non-physical (spurious) fixed points (FPs). Then the dependence of spurious as well as of the Wilson-Fisher FPs on the resummation parameters is carefully studied. The critical exponents at the Wilson-Fisher FP show a weak dependence on the resummation parameters. On the contrary, the exponents at the spurious FP as well as its very existence are strongly dependent on these parameters. For the cubic model, a new stable FP is found and its properties depend also strongly on the resummation parameters. It appears to be spurious, as expected. As for the frustrated models, there are two cases depending on the value of the number of spin components. When N is greater than a critical value Nc, the stable FP shows common characteristic with the Wilson-Fisher FP. On the contrary, for N3, we conclude that the transitions for XY and Heisenberg frustrated magnets are of first order
Proceedings Transborder Library Forum 2007 : bridging the digital divide : crossing all borders = Memorias Foro Transfronterizo de Bibliotecas 2007 : cerrando la brecha digital : cruzando todas las fronteras
No full textIt is with great pleasure that we present this edition of the Proceedings of the Transborder Library Forum (Foro). The 2007 Transborder Library Forum was held at Arizona State University in Tempe, Arizona in February, 2007. We are pleased that there will be both a print edition and an online edition. Editing has been kept to a minimum to preserve the intent of the author in the language the paper was presented. The theme for the 2007 Foro was Bridging the Digital Divide. Topics ranged from international copyright issues to getting information to students in widely dispersed communities with little or no infrastructure except the Internet. While most attendees and speakers were from the USA and Mexico, we also had some from Uganda, Kenya, Hungary, and the West Indies
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