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Dispersion requirements in coherent frequency-to-time mapping
(Optical Society of America, 2011) Leaird, Daniel E.; Weiner, Andrew M.; Naval Postgraduate School
The frequency-to-time mapping technique (also known as the temporal far-field phenomenon) usually requires a significant amount of dispersion to stretch an ultrashort optical pulse so that the intensity profile becomes a scaled replica of its optical spectrum. In this work, we study the near-to-far-field transition and find that the far-field condition can be relaxed in some cases relevant for radio-frequency (RF) waveform generation. This observation has allowed us to achieve intensity signals with an ultrabroad RF bandwidth content.
Voice of America HF Curtain Array Interference Study
(Monterey, California: The BDM Corporation, 1981-07-09) Adler, Richard W.; Naval Postgraduate School (U.S.)
This report describes the results of a computer modeling investigation in which the interference to VHF and UHF communicationsnavigation equipments from a Voice of America HF relay station was determined. The radiating portions of the station were modeled using the Numerical Electromagnetic Code NEC. Interference models predict, based on the data available, that the relay station and the nearby airport-based equipments are not compatible.
CounterNet
(2014) McAlinden, Ryan; University of Southern California; Institute of Creative Technologies
A comparison of behavioral and conventional conceptions of investment
(Elsevier, 1987) Bromiley, Philip
Capital investment is a fundamental concern of economic theory. Yet, in spite of the enormous literature on the determinants of capital investment and the vigorous economic policies directed at influencing the size and composition of capital investment, researchers have been unable to demonstrate that the more advanced theories are superior to the traditional sales-based and sales-and-income-based flexible accelerators (see Jorgenson and Siebert, 1986a; Bischoff 1971b; Elliot, 1973;Clark, 1979; and Wisley and Johnson, 1985 for comparisons of alternative models of capital investment). In sharp contrast to Jorgenson and Siebert's view almost two decades ago that the determinants of capital investment are well understood and the area only needed refinement [1968a, p. 710], recent papers continue basic disagreements over the proper specification of investment models (see for instance (I) the exchange between Chirinko and Eisner, 1983 and Sinai and Eckstein, 1983, and (ii) Feldstein, 1982, who, despairing of obtaining the "correct" model, estimates a number of models hoping to find some conclusions that are not sensitive to model specification]. Mairesse and Dormont [1985, p.222] report, "there are stills doubts and debates among economists about the real importance of factor price elasticities," factor price elasticities being a central feature of neoclassical investment models. In short, a generally satisfactory model of capital has not been found.
RELIEF 12-03 Draft Report
(Monterey, California: Naval Postgraduate School, 2012-06-12) Crowley, John; Wells, Linton II; Bendett, Sam; Center for Technology and National Security Policy (CTNSP); Naval Postgraduate School (U.S.); National Defense University (U.S.)
SUMMARY: The eleventh event of the Research and Experimentation for Local and International First Responders (RELIEF) projects took place from 21-23 May 2012 at the National Defense University in Washington, DC. Over 60 people from 33 organizations in the disaster response community participated in crowdsourced and tabletop experiments. Key Successes: - Tested Crowdsourcing of the Analysis of NEXTVIEW Satellite Imagery: Completed a performance test on the first official workflow of government-owned commercial imagery to a crowdsourcing organization under the NEXTVIEW imagery license. 32 volunteer cartographers from OpenStreetMap put 10 refugee camps in Ethiopia and Kenya on the map, representing approximately 600,000 refugees. - Designed Methods for Crowdsourcing the Analysis of Civil Air Patrol Imagery: FEMA asked for means to accelerate the tasking, collection, and analysis of imagery from Civil Air Patrol. Experts at RELIEF designed five methods that will be explored in August with FEMA and CAP. - Explored Alternative Pathways for Unclassified Information Sharing: Government approaches to sharing information across agencies and with external partners has centered on the use outdated and ineffective web portals—a practice that requires intensive and expensive human labor to read and make sense of accelerating information flows. Experts explored web services architectures for federating data exchange and using machine to filter and analyze big data.
Capillary force-driven, large-area alignment of multi-segmented nanowires
(ACM, 2014) Zhou, Xiaozhu; Zhou, Yu; Ku, Jessie C.; Zhang, Chuan; Mirkin, Chad A.; Northwestern University; Chemistry
We report the large-area alignment of multi-segmented nanowires in nanoscale trenches facilitated by capillary forces. Electrochemically synthesized nanowires between 120 and 250 nm in length are aligned and then etched selectively to remove one segment, resulting in arrays of nanowires with precisely controlled gaps varying between 2 and 30 nm. Crucial to this alignment process is the dispersibility of the nanowires in solution which is achieved by chemically modifying them with hexadecyltrimethylammonium bromide. We found that, even without the formation of an ordered crystalline phase at the droplet edges, the nanowires can be aligned in high yield. To illustrate the versatility of this approach as a nanofabrication technique, the aligned nanowires were used for the fabrication of arrays of gapped graphene nanoribbons and SERS substrates.
Contractors in the 21st Century "Combat Zone"
(College Park, Maryland. University of Maryland, 2005-04) Dunn, Richard L.; School of Public Policy
Victory in the Cold War brought reduced military budgets and lower end-strengths. Contemporaneously, operations’ tempo rose dramatically. This, plus government policies favoring outsourcing, led to a growth in importance of contracted support for military operations; and, correspondingly an increasing prevalence of contractor personnel in proximity to combat. This paper reviews the legal status of civilian contractors in proximity to combat; control, discipline and force protection of such personnel; and, the impact and cost effectiveness of contract support on combat operations. Particular attention is paid to the contracting process and its impact on the effective delivery of combat support. The adequacy of traditional contracting policies and processes for combat support functions and the need for possible changes are examined. The research found there had been a lag in updating policy and doctrine based on lessons learned and that on occasion a “business as usual” approach has decreased the efficiency of contracted contingency support. Serious deficiencies in organization and training for contingency contracting in support of joint operations persist. Contracting in a stressful environment has demonstrated the inadequacy of certain government contracting procedures.
Assyrian Nationalism as Conducted Through the Church of the East and its Implications for the Northern Iraqi Oilfields
(1991-08-26) Delgenis, Tony; Naval Postgraduate School (U.S.); National Security Affairs (NSA)
Since their seminal migration from the Arabian Peninsula, Assyrians have resided in what is present-day Iraq. From 1350-612 B.C., the ancient Assyrian Empire enjoyed regional preeminence (albeit fluctuating) until the fall of Nineveh. A physical link via blood ties to the ancient Assyrians is claimed by modern Assyrians; additionally, these modern Assyrians have been increasingly seeking the formation of their own separate and distinct nation-state since the end of World War I. In the 20th century, the Assyrians within Iraq have proven to be a most nettlesome minority to the central government; moreover, their presence in the northern Iraqi oil region is another problematic facet of this nationalism. Given its dependence on oil revenues, it is highly unlikely that the Iraqi government will cede any of its territory- especially in the lucrative northern oil region- to the Assyrians. Contrapuntally, it is equally unlikely that the Assyrians will drop their nationalistic demands. This paper will examine contemporary Assyrian nationalism as conducted through the Church of the East, its implications, and its future.
Photonically enabled agile rf waveform generation by optical comb shifting
(2010) Long, Christopher M.; Leaird, Daniel E.; Weiner, Andrew M.
We present a photonically enabled rf arbitrary waveform generator that can rapidly switch between two output waveforms. This method is based on line-by-line shaping of an optical comb and then converting the optical pulses to rf waveforms with a fast photodetector. It uses a single diode laser as the optical source and selects different patterns preprogrammed into an optical pulse shaper by shifting the laser frequency. We demonstrate minimum update delay times of 0:45 ns.
Tropical low formation and intensification over land as seen in ECMWF analyses
(2017) Kilroy, Gerard; Smith, Roger K.; Montgomery, Michael T.; Naval Postgraduate School; Meteorology
Case studies of the formation and intensification over land of three tropical lows in northern Australia are described. The case studies are based on European Centre for Medium-Range Weather Forecasts (ECMWF) analyses. The aim is to investigate the generality of recent results concerning the dynamics and thermodynamics of tropical lows. Consistent with these results, it is found that the processes of low formation and intensification are the same over land as over the ocean. An important element of the intensification process is the need for bursts of deep convection to persist near the circulation centre, which, in turn, requires that convective instability be maintained by surface moisture fluxes. The moist monsoonal environment locally surrounding the storm provides a shield against the adverse effects of dry-air intrusion from the Australian continent.