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Articles 2011 - 2040 of 2927
Full-Text Articles in Entire DC Network
Alternative Approach For Teaching Multibody Dynamics, George Sutherland
Alternative Approach For Teaching Multibody Dynamics, George Sutherland
Articles
The paper presents an alternative method, the Implicit Constraint Approach (ICA), for developing the equations of motion to describe a system of connected bodies typified by mechanisms and robotic devices. By its simplicity of description and implementation compared to conventional methods, the ICA engages students more in the physics (rather than the mathematics) of the system under study. The ICA enables the direct formation of all needed equations by using only the dynamic equilibrium conditions (in the Newton or Lagrange form). Unlike current approaches, no auxiliary algebraic constraint equations are required. Thus the descriptive equations are ordinary differential equation (ODEs) …
So Much More Than A "Harmless Drudge": Samuel Johnson And His Dictionary, Joan Howland
So Much More Than A "Harmless Drudge": Samuel Johnson And His Dictionary, Joan Howland
Articles
No abstract provided.
Existence Of Infinitely Many Distinct Solutions To The Quasi-Relativistic Hartree-Fock Equations, Mattias Enstedt, Michael Melgaard
Existence Of Infinitely Many Distinct Solutions To The Quasi-Relativistic Hartree-Fock Equations, Mattias Enstedt, Michael Melgaard
Articles
We establish existence of infinitely many distinct solutions to the semilinear elliptic Hartree-Fock equations for N-electron Coulomb systems with quasirelativistic kinetic energy −α−2Δxn α−4 − α−2 for the nth electron. Moreover, we prove existence of a ground state. The results are valid under the hypotheses that the total charge Ztot of K nuclei is greater than N − 1 and that Ztot is smaller than a critical charge Zc. The proofs are based on a new application of the Fang-Ghoussoub critical point approach to multiple solutions on a noncompact Riemannian manifold, in combination with density operator techniques.
An Analysis Of Drug Dissolution Rates In The Usp 24 Type 2 Apparatus, David Mcdonnell, Brendan Redmond, Deirdre M. D'Arcy, Anne Marie Healy, Owen Corrigan
An Analysis Of Drug Dissolution Rates In The Usp 24 Type 2 Apparatus, David Mcdonnell, Brendan Redmond, Deirdre M. D'Arcy, Anne Marie Healy, Owen Corrigan
Articles
This paper applies boundary layer theory to the process of drug dissolution in the USP 24, Type 2 Apparatus. The mass transfer rate from the top flat surface of a compact in various positions within the device is evaluated by means of a Pohlhausen integral method.
A Generic Approach To Computer-Based Clinical Practice Guideling Management Using The Eca Rule Paradigm And Active Databases, Bing Wu, Kudakwashe Dube
A Generic Approach To Computer-Based Clinical Practice Guideling Management Using The Eca Rule Paradigm And Active Databases, Bing Wu, Kudakwashe Dube
Articles
The increasing demand for reduced cost and improved quality of service in healthcare has prompted the call for better management of medical knowledge. The main emphasis has been on knowledge that is acquired through experience and medical research and then formalised into Clinical Practice Guidelines (CPGs). This paper presents a generic approach to CPG information and knowledge management that uses the Event-Condition-Action (ECA) rule paradigm and active databases within a unified management framework. The paper focuses on an approach for facilitating the use and management of CPGs by clinicians through delivering the CPGs at the point-of-care by a computerised mechanism.
Rankings And The Battle For World-Class Excellence: Institutional Strategies And Policy Choices, Ellen Hazelkorn
Rankings And The Battle For World-Class Excellence: Institutional Strategies And Policy Choices, Ellen Hazelkorn
Articles
Global rankings are creating a furore wherever or whenever they are published or mentioned. They have become a barometer of global competition measuring the knowledge-producing and talent-catching capacity of higher education institutions. These developments are injecting a new competitive dynamic into higher education, nationally and globally, and encouraging a debate about its role and purpose. As such, politicians regularly refer to them as a measure of their nation’s economic strength and aspirations, universities use them to help set or define targets mapping their performance against the various metrics, while academics use rankings to bolster their own professional reputation and status. …
Analysis And Evaluation Of The Dynamic Performance Of Sma Actuators For Prosthetic Hand Design, Kevin O'Toole, Mark Mcgrath, Eugene Coyle
Analysis And Evaluation Of The Dynamic Performance Of Sma Actuators For Prosthetic Hand Design, Kevin O'Toole, Mark Mcgrath, Eugene Coyle
Articles
It is widely acknowledged within the biomedical engineering community that shape memory alloys (SMAs) exhibit great potential for application in the actuation of upper limb prosthesis designs. These lightweight actuators are particularly suitable for prosthetic hand solutions. A four-fingered, 12 degree-of-freedom prosthetic hand has been developed featuring SMA bundle actuators embedded within the palmar structure. Joule heating of the SMA bundle actuators generates sufficient torque at the fingers to allow a wide range of everyday tasks to be carried out. Transient characterization of SMA bundles has shown that performance/response during heating and cooling differs substantially. Natural convection is insufficient to …
Effect Of Organic Chelates On The Performance Of Hybrid Sol–Gel Coated Aa2024-T3 Aluminium Alloys, Rajath Varma, John Colreavy, John Cassidy, Mohamed Oubaha, Colette Mcdonagh, Brendan Duffy
Effect Of Organic Chelates On The Performance Of Hybrid Sol–Gel Coated Aa2024-T3 Aluminium Alloys, Rajath Varma, John Colreavy, John Cassidy, Mohamed Oubaha, Colette Mcdonagh, Brendan Duffy
Articles
Sol–gels are organic–inorganic polymers formed by hydrolysis/condensation reactions of alkoxide precursors, primarily silanes, which have found applications as electronic, optical and protective coatings. These coatings possess important characteristics such as chemical stability, physical strength and scratch resistance. Further performance improvement is achieved through the incorporation of zirconium and titanium based nanoparticles, also formed through the sol–gel process. However due to the inherent difference in the reactivity of the precursors, the hydrolysis of each precursor must be carried out separately before being combined for final condensation. Zirconium precursors are commonly chelated using acetic acids, prior to hydrolysis, to lower the hydrolysis …
Zero-Broadening Measurement In Brillouin Based Slow-Light Delays, Andrzej Wiatrek, Ronny Henker, Stefan Preußler, Max Ammann, Andreas Schwarzbacher, Thomas Schneider
Zero-Broadening Measurement In Brillouin Based Slow-Light Delays, Andrzej Wiatrek, Ronny Henker, Stefan Preußler, Max Ammann, Andreas Schwarzbacher, Thomas Schneider
Articles
A novel method for the achievement of zero-broadening in a SBS based slow-light system is discussed in theory and demonstrated experimentally. The system is realized just with a single broadened Brillouin gain. It is shown, that if the gain bandwidth is much broader than the initial pulse width, the output pulse width decreases with increasing pump power. A compression of approximately 90 % of the initial pulse width was achieved in simulation and experiment.
On Modules Which Are Self-Slender, R. Gobel, Brendan Goldsmith, O. Kolman
On Modules Which Are Self-Slender, R. Gobel, Brendan Goldsmith, O. Kolman
Articles
This paper is an examination of the dual of the fundamental isomorphism relating homomorphism groups involving direct sums and direct products over arbitrary index sets. Recall that a module G is said to be self-slender if every homomorphism from a countable product of copies of G into G, vanishes on all but finitely many of the components of the product. Modules of this type are investigated. The simplest version of the results obtained is that under weak cardinality restrictions, there exist non-slender but self-slender Abelian groups.
Two Component Integrable Systems Modelling Shallow Water Waves: The Constant Vorticity Case, Rossen Ivanov
Two Component Integrable Systems Modelling Shallow Water Waves: The Constant Vorticity Case, Rossen Ivanov
Articles
In this contribution we describe the role of several two-component integrable systems in the classical problem of shallow water waves. The starting point in our derivation is the Euler equation for an incompressible fluid, the equation of mass conservation, the simplest bottom and surface conditions and the constant vorticity condition. The approximate model equations are generated by introduction of suitable scalings and by truncating asymptotic expansions of the quantities to appropriate order. The so obtained equations can be related to three different integrable systems: a two component generalization of the Camassa-Holm equation, the Zakharov-Ito system and the Kaup-Boussinesq system. The …
1-D Schrödinger Operators With Local Point Interactions On A Discrete Set, Aleksey Kostenko, Mark M. Malamud
1-D Schrödinger Operators With Local Point Interactions On A Discrete Set, Aleksey Kostenko, Mark M. Malamud
Articles
Spectral properties of 1-D Schrödinger operators HX,α := − d2 dx2 + xn∈X αnδ(x − xn) with local point interactions on a discrete set X = {xn}∞ n=1 are well studied when d∗ := infn,k∈N |xn − xk| > 0. Our paper is devoted to the case d∗ = 0. We consider HX,α in the framework of extension theory of symmetric operators by applying the technique of boundary triplets and the corresponding Weyl functions.
Assessing University Strategic Plans: A Tool For Consideration, Shannon Chance, Brenda T. Williams
Assessing University Strategic Plans: A Tool For Consideration, Shannon Chance, Brenda T. Williams
Articles
This article explores the use of rubrics as tools for assessing the quality of university-developed strategic plans. While tools exist for assessing the quality of the planning process, such tools are not readily available for assessing the resulting product or the overall quality of the plan itself. Specifi cally, a rubric is described that has been designed and fi eld-tested for the purpose of evaluating the strategic planning document produced at the university level. This approach builds upon outcome assessment methods developed in the business sector and proposes a tool tailored for use in higher education.
Invisible Borders: Mapping Out Virtual Law, Kathleen Claussen
Invisible Borders: Mapping Out Virtual Law, Kathleen Claussen
Articles
No abstract provided.
Compact Uwb Antenna With I-Shaped Band-Notch Parasitic Element For Laptop Applications, Nakchung Choi, Changwon Jung, Joonho Byun, Frances J. Harackiewicz, Myun-Joo Park, Yong-Seek Chung, Taekyun Kim, Byungje Lee
Compact Uwb Antenna With I-Shaped Band-Notch Parasitic Element For Laptop Applications, Nakchung Choi, Changwon Jung, Joonho Byun, Frances J. Harackiewicz, Myun-Joo Park, Yong-Seek Chung, Taekyun Kim, Byungje Lee
Articles
A compact ultrawideband (UWB) antenna with a band-notch function is proposed for laptop applications. The band-notch function is realized by a half-wavelength parasitic element printed on the rear side of the substrate. The impedance bandwidth (VSWR < 2) of the antenna is 3.1 ~ 11.4 GHz (114%) with a notched frequency from 5.05 to 5.90 GHz. The antenna has a fairly good omnidirectional pattern, and the average gain is -3.0 ~ -1.2 dBi over the UWB frequency band except for the notched frequency band. The performance of the proposed antenna is confirmed by simulation and measurement results.
Comparative Models Of Hydrocarbon Emissions For A Diesel Engine Operating At Constant Loads And Speeds, Dennis G. Watson, David R. Bostic, Tony V. Harrison
Comparative Models Of Hydrocarbon Emissions For A Diesel Engine Operating At Constant Loads And Speeds, Dennis G. Watson, David R. Bostic, Tony V. Harrison
Articles
Linear multiple regression (LMR) and nonlinear polynomial network (NPN) models were developed from data collected from ISO 8178‐4 (1996) test cycle B‐type tests (ISO) and an expanded set of tests (EXP) to predict hydrocarbon (HC) emissions from a diesel engine. LMR using the ISO training data (R2 = 0.94) resulted in overfitting of the model as applied to the evaluation data (R2 = 0.49). LMR based on the expanded data (R2 = 0.68) was a better LMR model when applied to the evaluation data (R2 = 0.64). NPN using the expanded training data (R2 = 0.99) resulted in the best …
Wealth Is Just Capital!, George Mundstock
The Patient Life: Can Consumers Direct Health Care?, Carl E. Schneider, Mark A. Hall
The Patient Life: Can Consumers Direct Health Care?, Carl E. Schneider, Mark A. Hall
Articles
The ultimate aim of health care policy is good care at good prices. Managed care failed to achieve this goal through influencing providers, so health policy has turned to the only market-based option left: treating patients like consumers. Health insurance and tax policy now pressure patients to spend their own money when they select health plans, providers, and treatments. Expecting patients to choose what they need at the price they want, consumerists believe that market competition will constrain costs while optimizing quality. This classic form of consumerism is today's health policy watchword. This article evaluates consumerism and the regulatory mechanism …
Evolutionary Theory And The Origin Of Property Rights, James E. Krier
Evolutionary Theory And The Origin Of Property Rights, James E. Krier
Articles
For legal scholars, the evolution of property rights has been a topic in search of a theory. My aim here is to draw together various accounts (some of them largely neglected in the legal literature), from dated to modern, and suggest a way they can be melded into a plausible explanation of property's genesis and early development. What results hardly amounts to a theory, but it does suggest an outline for one. Moreover, it provides a primer on the subject, a reasonably solid foundation for thinking and talking about the evolution of property rights.
The Federal Courts As A Franchise: Rethinking The Justifications For Federal Question Jurisdiction, Gil Seinfeld
The Federal Courts As A Franchise: Rethinking The Justifications For Federal Question Jurisdiction, Gil Seinfeld
Articles
The components of the Federal Franchise model-procedural homogeneity, cultural conformity, and technical competence-should be familiar. The federal courts' capacity to provide these benefits has not escaped commentators' notice; indeed, there are points of connection between these features of federal court adjudication and the individual fragments of the conventional account.l0 But prior scholarly discussion of these themes has been unsystematic, treating them as (at best) secondary considerations when it comes to the allocation of federal question cases between the state and federal courts. This Article attempts to weave together these previously disconnected strands of thinking about federal court adjudication and to …
Phase Transitions In Materials With Thermal Memory: The Case Of Unequal Conductivities, John Murrough Golden
Phase Transitions In Materials With Thermal Memory: The Case Of Unequal Conductivities, John Murrough Golden
Articles
A model for thermally induced phase transitions in materials with thermal memory was recently proposed, where the equations determining heatflow were assumed to be the same in both phases. In this work, the model is generalized to the case of phase dependent heatflow relations. The temperature (or coldness) gradient is decomposed into two parts, each zero on one phase and equal to the temperature (or coldness) gradient on the other. However, they vary smoothly over the transition zone. These are treated as separate independent quantities in the derivation of field equations from thermodynamics. Heat flux is given by an integral …
On The Socles Of Fully Invariant Abelian P-Groups, Brendan Goldsmith, P. V. Danchev
On The Socles Of Fully Invariant Abelian P-Groups, Brendan Goldsmith, P. V. Danchev
Articles
The classification of the fully invariant subgroups of a reduced Abelian p-group is a difficult long-standing problem when one moves outside of the class of fully transitive groups. In this work we restrict attention to the socles of fully invariant subgroups and introduce a new class of groups which we term socle-regular groups; this class is shown to be large and strictly contains the class of fully transitive groups. The basic properties of such groups are investigated but it is shown that the classification of even this simplified class of groups, seems extremely difficult.
Converging Flow Between Coaxial Cones, O. Hall, A. D. Gilbert, C. P. Hills
Converging Flow Between Coaxial Cones, O. Hall, A. D. Gilbert, C. P. Hills
Articles
Fluid flow governed by the Navier-Stokes equation is considered in a domain bounded by two cones with the same axis. In the first, 'non-parallel' case, the two cones have the same apex and different angles θ = α and β in spherical polar coordinates (r, θ, φ). In the second, 'parallel' case, the two cones have the same opening angle α, parallel walls separated by a gap h and apices separated by a distance h/sinα. Flows are driven by a source Q at the origin, the apex of the lower cone in the parallel case. The Stokes solution for the …
Nonaxisymmetric Stokes Flow Between Concentric Cones, O. Hall, C. P. Hills, A. D. Gilbert
Nonaxisymmetric Stokes Flow Between Concentric Cones, O. Hall, C. P. Hills, A. D. Gilbert
Articles
We study the fully three-dimensional Stokes flow within a geometry consisting of two infinite cones with coincident apices. The Stokes approximation is valid near the apex and we consider the dominant flow features as it is approached. The cones are assumed to be stationary and the flow to be driven by an arbitrary far-field disturbance. We express the flow quantities in terms of eigenfunction expansions and allow for the first time for nonaxisymmetric flow regimes through an azimuthal wave number. The eigenvalue problem is solved numerically for successive wave numbers. Both real and complex sequences of eigenvalues are found, their …
Generalised Fourier Transform And Perturbations To Soliton Equations, Georgi Grahovski, Rossen Ivanov
Generalised Fourier Transform And Perturbations To Soliton Equations, Georgi Grahovski, Rossen Ivanov
Articles
A brief survey of the theory of soliton perturbations is presented. The focus is on the usefulness of the so-called Generalised Fourier Transform (GFT). This is a method that involves expansions over the complete basis of “squared solutions” of the spectral problem, associated to the soliton equation. The Inverse Scattering Transform for the corresponding hierarchy of soliton equations can be viewed as a GFT where the expansions of the solutions have generalised Fourier coefficients given by the scattering data. The GFT provides a natural setting for the analysis of small perturbations to an integrable equation: starting from a purely soliton …
Equations Of The Camassa-Holm Hierarchy, Rossen Ivanov
Equations Of The Camassa-Holm Hierarchy, Rossen Ivanov
Articles
The squared eigenfunctions of the spectral problem associated with the CamassaHolm (CH) equation represent a complete basis of functions, which helps to describe the inverse scattering transform for the CH hierarchy as a generalized Fourier transform (GFT). All the fundamental properties of the CH equation, such as the integrals of motion, the description of the equations of the whole hierarchy, and their Hamiltonian structures, can be naturally expressed using the completeness relation and the recursion operator, whose eigenfunctions are the squared solutions. Using the GFT, we explicitly describe some members of the CH hierarchy, including integrable deformations for the CH …
Algebraic Entropy For Abelian Groups, Dikran Dikranjan, Brendan Goldsmith, Luigi Salce, Paolo Zanardo
Algebraic Entropy For Abelian Groups, Dikran Dikranjan, Brendan Goldsmith, Luigi Salce, Paolo Zanardo
Articles
The theory of endomorphism rings of algebraic structures allows, in a natural way, a systematic approach based on the notion of entropy borrowed from dynamical systems. Here we study the algebraic entropy of the endomorphisms of Abelian groups, introduced in 1965 by Adler, Konheim and McAndrew. The so-called Addition Theorem is proved; this expresses the algebraic entropy of an endomorphism $ \phi$ of a torsion group as the sum of the algebraic entropies of the restriction to a $ \phi$-invariant subgroup and of the endomorphism induced on the quotient group. Particular attention is paid to endomorphisms with zero algebraic entropy …
Daemon Decay And Inflation, Emil Prodanov
Daemon Decay And Inflation, Emil Prodanov
Articles
In 1971, Hawking suggested [1] that there may be a very large number of gravitationally collapsed charged objects of very low masses, formed as a result of fluctuations in the early Universe. A mass of of these objects could be accumulated at the centre of a star like the Sun. The masses of these collapsed objects are from and above and their charges are up to ±30 electron units [1].
One-Pot Synthesis Of Anionic (Nitrogen) And Cationic (Sulfur) Codoped High-Temperature Stable, Visible Light Active, Anatase Photocatalysts, Suresh Pillai, Declan Mccormack, Steven Hinder, Pradeepan Periyat
One-Pot Synthesis Of Anionic (Nitrogen) And Cationic (Sulfur) Codoped High-Temperature Stable, Visible Light Active, Anatase Photocatalysts, Suresh Pillai, Declan Mccormack, Steven Hinder, Pradeepan Periyat
Articles
No abstract provided.
Better (Or Worse?) Risk Management Through Technology, Caroline Bradley
Better (Or Worse?) Risk Management Through Technology, Caroline Bradley
Articles
No abstract provided.