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Articles 4111 - 4140 of 6005
Full-Text Articles in Entire DC Network
Mass Deficits, Stalling Radii, And The Merger Histories Of Elliptical Galaxies, David Merritt
Mass Deficits, Stalling Radii, And The Merger Histories Of Elliptical Galaxies, David Merritt
Articles
A binary supermassive black hole leaves an imprint on a galactic nucleus in the form of a “mass deficit,” a decrease in the mass of the nucleus due to ejection of stars by the binary. The magnitude of the mass deficit is in principle related to the galaxy’s merger history, but the relation has never been quantified. Here, highaccuracy N-body simulations are used to calibrate this relation. Mass deficits are shown to be Mde f ≈ 0.5M12, with M12 the total mass of the binary; the coefficient in this relation depends only weakly on M2/M1 or on the galaxy’s pre-existing …
Don't Go There: When To Abandon Lesson Plans And Venture, Humbly, Into Ground Zero, Sue Norton
Don't Go There: When To Abandon Lesson Plans And Venture, Humbly, Into Ground Zero, Sue Norton
Articles
This paper discusses pedagogical styles that are appropriate in the classroom.
Slit-Scan Photography, Andrew Davidhazy
Slit-Scan Photography, Andrew Davidhazy
Articles
Slit-scan photography is the inverse of strip photography and exposure occurs just as with Focal plane shutter cameras but under more controlled conditions. Slit-scan photography exploits focal plane shutter distortion. This article explains theory and application of this unusual technique.
Photoinstrumentation On The Range: A Laboratory Simulation For Postsecondary Education, Andrew Davidhazy
Photoinstrumentation On The Range: A Laboratory Simulation For Postsecondary Education, Andrew Davidhazy
Articles
Students were involved first hand in a simulation of events patterned after those at the White Sands Missile Range during the launch and photography of a missile. A special, but simplified photographic apparatus was used to record flight data. The purpose of the project was to emphasize the important role that photography plays in the acquisition of data and to expose the students to a quantitive application of photography. Cooperation, trust in fellow students and teamwork were an integral part of the project. Career opportunities in the photoinstrumentation field were also discussed.
Color Interpretation: A Function Of Process & Film, Michael Peres
Color Interpretation: A Function Of Process & Film, Michael Peres
Articles
Characteristics of modern color emulsions are reviewed and summarized by Professor Michael Peres particularly for Biomedical applications but expandable to other situations as well.
Applications Of Slow And Fast Streak Recording Cameras, Andrew Davidhazy
Applications Of Slow And Fast Streak Recording Cameras, Andrew Davidhazy
Articles
This paper deals with two applications of streak photography in everyday industrial and biological research and development endeavors. In each instance, the simplicity and low cost with which the data could be reduced to useful information and the ease with which it could be communicated to other technical personnel was an important side benefit. In the first case, a laboratory built rotating drum streak camera with a 12" circumference, was used to study the performance of the new Olympus F-280 flash on an Olympus OM-4T camera. The strobing frequency, starting characteristics, duration under manual and camera control, flash relationship to …
Preparation Of Technical Reports, Ronald Francis
Preparation Of Technical Reports, Ronald Francis
Articles
This is a brief article that was prepared and distributed to his students by the late Dr. Ronald Francis, of the Photographic Science department in the School of Photographic Arts and Sciences at RIT. It is included here in his memory and to continue to serve students of photographic sciences into the future.
Distinguishing Trustees And Protecting Beneficiaries: A Response To Professor Leslie, Karen E. Boxx
Distinguishing Trustees And Protecting Beneficiaries: A Response To Professor Leslie, Karen E. Boxx
Articles
No abstract provided.
Age Concern: The Future Of The Oecd, Richard Woodward
Age Concern: The Future Of The Oecd, Richard Woodward
Articles
‘Life’, so the adage has it, ‘begins at 40’. But, as American journalist Helen Rowland wryly observed, ‘so do fallen arches, rheumatism, faulty eyesight, and the tendency to tell a story to the same person, three or four times’. Such a sentiment should resonate within the Parisian corridors of the Organisation for Cooperation and Development (OECD) which celebrates its 45th anniversary on 30 September. Rival institutional developments, evolving geo-political realities, hostility from non-governmental organisations (NGOs) and the absence of a precisely defined mission statement have marred the OECD’s fifth decade and left the organisation struggling to justify its place in …
Prevalence Of Substantive Consolidation In Large Bankruptcies From 2000 To 2004: Preliminary Results, William H. Widen
Prevalence Of Substantive Consolidation In Large Bankruptcies From 2000 To 2004: Preliminary Results, William H. Widen
Articles
No abstract provided.
After Autonomy, Carl E. Schneider
After Autonomy, Carl E. Schneider
Articles
Bioethicists today are like Bolsheviks on the death of Lenin. They have, rather to their surprise, won the day. Their principle of autonomy is dogma. Their era of charismatic leadership is over. Their work of Weberian rationalization, of institutionalizing principle and party, has begun. The liturgy is reverently recited, but the vitality of Lenin's "What Is To Be Done?" has yielded to the vacuity of Stalin's "The Foundations of Leninism." Effort once lavished on expounding ideology is now devoted to establishing associations, organizing degree programs, installing bioethicist commissars in every hospital, and staffing IRB soviets. Not-so-secret police prowl the libraries …
Lossless Compression Of Color Palette Images With One-Dimensional Techniques, Ziya Arnavut, Ferat Sahin
Lossless Compression Of Color Palette Images With One-Dimensional Techniques, Ziya Arnavut, Ferat Sahin
Articles
Palette images are widely used on the World Wide Web (WWW) and in game-cartridge applications. Many images used on the WWW are stored and transmitted after they are compressed losslessly with the standard graphics interchange format (GIF), or portable network graphics (PNG). Well-known 2-D compression schemes, such as JPEG-LS and JPEG-2000, fail to yield better compression than GIF or PNG due to the fact that the pixel values represent indices that point to color values in a look-up table. To improve the compression performance of JPEG-LS and JPEG-2000 techniques, several researchers have proposed various reindexing algorithms. We investigate various compression …
Integrated Antenna For Multiband Multi-National Wireless Combined With Gsm1800/Pcs1900/Imt2000 + Extension, Matthias John, Max Ammann
Integrated Antenna For Multiband Multi-National Wireless Combined With Gsm1800/Pcs1900/Imt2000 + Extension, Matthias John, Max Ammann
Articles
A printed triple-band monopole antenna appropriate for use as a terminal antenna in modern wireless multiband systems is proposed. The impedance bandwidth of each band has been optimised using a quasi-Newton technique and the bandwidth includes virtually all wireless bands. Various parameter sweeps are presented which improve our understanding of the antenna, in particular, the effect of groundplane-size and branch-off point on impedance bandwidth and radiation pattern.
Brownian Motion Of Black Holes In Dense Nuclei, David Merritt, Frederik Laun
Brownian Motion Of Black Holes In Dense Nuclei, David Merritt, Frederik Laun
Articles
We evaluate the Brownian motion of a massive particle ("black hole") at the center of a galaxy using N-body simulations. Our galaxy models have power-law central density cusps like those observed at the centers of elliptical galaxies. The simulations show that the black hole achieves a steady-state kinetic energy that is substantially different than would be predicted based on the properties of the galaxy model in the absence of the black hole. The reason appears to be that the black hole responds to stars whose velocities have themselves been raised by the presence of the black hole. Over a wide …
Distributed Approaches For Exploiting Multiuser Diversity In Wireless Networks, Xiangping Qin, Randall A. Berry
Distributed Approaches For Exploiting Multiuser Diversity In Wireless Networks, Xiangping Qin, Randall A. Berry
Articles
In wireless fading channels, multiuser diversity can be exploited by scheduling users to transmit when their channel conditions are favorable. This leads to a sum throughput that increases with the number of users and, in certain cases, achieves capacity. However, such scheduling requires global knowledge of every user’s channel gain, which may be difficult to obtain in some situations. This paper addresses contention-based protocols for exploiting multiuser diversity with only local channel knowledge. A variation of the ALOHA protocol is given in which users attempt to exploit multiuser diversity gains, but suffer contention losses due to the distributed channel knowledge. …
Throughput Performance Of An Adaptive Arq Scheme In Rayleigh Fading Channels, A. Mehta, R. Viswanathan, D. Kagaris
Throughput Performance Of An Adaptive Arq Scheme In Rayleigh Fading Channels, A. Mehta, R. Viswanathan, D. Kagaris
Articles
Using a simulation study we analyze the throughput performance of Yao’s adaptive ARQ scheme in time-varying channels. The simulation takes into account the Rayleigh amplitude and the fast or the slow fading characteristics of a wireless channel, under a representative M-FSK modulation and Reed-Solomon coding scheme. We show that, for a specific set of design parameters, Yao’s adaptive procedure works well for all channel fading rates, except for moderately slow rates. By observing variations of packet error rates at a specified SNR we provide an explanation for these varied behaviors under different channel fading rates.
Reexamining Media Capacity Theories Using Workplace Instant Messaging, Yu-Ting Caisy Hung, Wei-Chang Kong, Ai-Ling Chua
Reexamining Media Capacity Theories Using Workplace Instant Messaging, Yu-Ting Caisy Hung, Wei-Chang Kong, Ai-Ling Chua
Articles
This study empirically examines the general propositions of media capacity theories using a newer and increasing popular communication medium: instant messaging. We developed hypothe ses based on the proposition that synchronous communication media would be perceived to be more effective for convergence communication and asynchronous communication media would be perceived to be more suitable for conveyance communication. These hypotheses were tested using data collected from 81 IM users in four organizations by means of survey instruments develped for this study. The results suggested that although IM was perceived to be a highly synchronous communication medium, it was not perceived to …
Dove: Campaign For True Beauty, Katherine Robert, Jeffrey Murray
Dove: Campaign For True Beauty, Katherine Robert, Jeffrey Murray
Articles
No abstract provided.
Competing Discourses On Journalism Education, Nora French
Competing Discourses On Journalism Education, Nora French
Articles
This paper is concerned with the lack of an agreed framework for the curriculum for journalism education. The paper reports on research into the beliefs and values underlying the two main undergraduate degree programmes in journalism in Ireland, with the aim of gaining a better understanding of the concepts of journalism and journalism education on which the curricula were based. Critical discourse analysis was used in the research. The discrepancies found in the two concepts within and between different texts make clear that the problems within journalism education reflect the wider problems of lack of closure in the discourses of …
Promoting Values As West Meets East, Michael Foley
Promoting Values As West Meets East, Michael Foley
Articles
As Western training agencies increasingly promote ‘democratic journalistic values’ in the former communist countries, Michael Foley argues that progress will only occur if the West ceases to see in journalism a way of strengthening the marketplace and helps local experts develop their own models
Irish Intelligence Staff Work From Kosovo To Kabul, Tom Clonan
Irish Intelligence Staff Work From Kosovo To Kabul, Tom Clonan
Articles
Normally associated with routine troop deployments and logistic support to UN peace keeping and peace enforcement missions worldwide, the Irish Defence Forces have recently dramatically expanded their international intelligence presence abroad. In the wake of 9/11, Ireland’s Military Intelligence Directorate was expanded in order to assess emerging threats to the state – both external and internal – posed by global terrorist networks such as Al Qaeda. As an independent state agency, Ireland’s military intelligence are focused on long term trends within the global security environment across a broad spectrum of threats, from nuclear, biological and chemical weapons proliferation to the …
Low-Cost Wavelength Measurement Based On A Macrobending Single-Mode Fiber, Qian Wang, Gerald Farrell, Thomas Freir, Ginu Rajan, Pengfei Wang
Low-Cost Wavelength Measurement Based On A Macrobending Single-Mode Fiber, Qian Wang, Gerald Farrell, Thomas Freir, Ginu Rajan, Pengfei Wang
Articles
A low-cost all-fiber wavelength measurement technique is proposed and demonstrated. A macrobending standard single-mode fiber is developed as an edge filter with an optimal design and simple surface processing. A ratiometric wavelength measurement system employing the developed macrobending fiber filter demonstrates a resolution of∼10 pmin a wavelength range from1500to1560 nmwith ease of assembly and calibration.
Design Of Integrated Polarization Beam Splitter With Liquid Crystal, Qian Wang, Gerald Farrell, Yuliya Semenova
Design Of Integrated Polarization Beam Splitter With Liquid Crystal, Qian Wang, Gerald Farrell, Yuliya Semenova
Articles
An integrated polarization beam splitter based on a directional coupler (DC) with an etched slot and filled-in liquid crystal covering layer, which utilizes the birefringence of liquid crystal materials, is proposed. A supermode solution for the DC involving birefringence materials and the corresponding full-vector anisotropic beam propagation method are employed as modeling tools. A numerical design of the proposed structure is presented. Beam propagation behavior along the whole structure involving curved input and output regions and central coupling region is simulated. Simulation result shows an extinction ratio of 25.3 and 41.9 dB for the TE and TM mode, respectively.
A Novel Gps Patch Antenna On A Fractal Hi-Impedance Surface Substrate, Xiulong Bao, Giuseppe Ruvio, Max Ammann, Matthias John
A Novel Gps Patch Antenna On A Fractal Hi-Impedance Surface Substrate, Xiulong Bao, Giuseppe Ruvio, Max Ammann, Matthias John
Articles
A compact high-performance circularly-polarized microstrip antenna for the global positioning system application is proposed. It comprises a fractal hi-impedance surface electromagnetic bandgap (EBG) structure printed on a high permittivity substrate. Measurements and simulation of return loss and axial ratio are in good agreement. It is shown that the proposed Global Positioning System antenna has good axial ratio performance in the upper half-plane, an improvement in gain and a significantly wider axial ratio bandwidth when compared to the same antenna without EBG
Process Modeling For Simulation, John Ryan, Cathal Heavey
Process Modeling For Simulation, John Ryan, Cathal Heavey
Articles
This paper discusses shortfalls in relation to the requirements gathering phases of simulation. While many developments have taken place around supporting the model coding task of simulation, there are few tools available to assist in the requirements gathering phase. This is surprising as it has been reported by several researchers that the requirements phase can absorb twice as much resources as the coding phase. There are numerous process modeling tools available (over 100) that can and have been used to support the requirements phase of simulation. This paper provides a selective review of some of the most important in relation …
The Importance Of Family And Community Links For Children In The Out Of Home Care System, David Williams
The Importance Of Family And Community Links For Children In The Out Of Home Care System, David Williams
Articles
Regardless of the exact setting in which the social care worker is involved, be it supporting clients in maintaining their position in the community or assisting clients in making a return to the general community, the maintenance of family and community links are key tools to the achievement of the above identified goals. The role of the parents, family and community in general must not be underestimated if we are to fully meet the needs of the vulnerable people with whom we work. In the following article we will discus the reasons why it is important for social care workers …
Attachment Theory And Wellbeing For The Young Person In Residential Care: The Provision Of A Second Chance Secure Base For The Child In Crisis, Gay Graham
Articles
Aristotle argued that happiness for humans is not possible in the absence of reciprocal, affective relationships or friendships (Sherman 1991). Such relationships for children are only possible in the context of satisfactory attachments which provide for them a secure base from which to explore their environment (Bowlby 1988). Young people placed in the child welfare system, particularly those in residential care, often experience a system that is problem focused, intent on physical protection and control, where warm reciprocal relationships are not prioritised. This paper states that young people in residential care, whose primary attachments, whatever their quality, have been disrupted; …
Voice Activated Command And Control With Speech Recognition Over Wifi, Brian Nolan, Tony Ayres
Voice Activated Command And Control With Speech Recognition Over Wifi, Brian Nolan, Tony Ayres
Articles
This paper presents work conducted to date on the development of a voice activated command and control framework specifically for the control of remote devices in a ubiquitous computing environment. The prototype device is a Java controlled Lego Mindstorm robot. The research considers three different scenario configurations. A recognition grammar for command and control of the robot has been created and implemented in Java, in part in the recognition engine and in part on the robot. The physical topology involves Java at each node endpoint, that is, at the handheld PC (iPaq), the PC workstation, the Linux server and onboard …
The Competitive Global City 2030: A Futures Approach, Ruth Kelly, John Ratcliffe, Julie Gannon
The Competitive Global City 2030: A Futures Approach, Ruth Kelly, John Ratcliffe, Julie Gannon
Articles
In an increasingly globalising and competitive world, cities are facing unparalleled challenges relating to such forces as economic restructuring and fiscal stress, national security, institutional relationships and the changing role of governance, environmental degradation, social and cultural transformation and rising exclusion. In May 2005, The Futures Academy, Technological University Dublin, in collaboration with the Urban Land Institute (ULI), embarked on a joint initiative to stimulate thinking and encourage informed discussions concerning the future trajectory and sustainable development of the competitive ‘global city’. As part of this study, The Academy undertook in-depth background research including a comprehensive questionnaire survey; an interactive …
Techonology Usage In The Supply Chain: The Case Of Small 3pls, Pietro Evangelista, Edward Sweeney
Techonology Usage In The Supply Chain: The Case Of Small 3pls, Pietro Evangelista, Edward Sweeney
Articles
Purpose - In today’s supply chain management (SCM) practices, a successful strategy depends
increasingly on the performance of Third Party Logistics (3PL) providers as they play a key
integrative role linking the different supply chain elements more effectively. Information and
Communications Technology (ICT) has become an important element of 3PL competitive
capability as it enables higher levels of supply chain integration. Recent industry developments
have widened the technological gap between large and small 3PLs. This is critical particularly for
those markets populated by a large number of small 3PLs such as the Italian logistics industry. The
purpose of this paper …