Article

USAF focuses on future long-range strike plans

January 2004

Authors:

The US Air Force (USAF) intends to solidify its vision of the next-generation long-range strike capabilities it will pursue in coming decades. USAF is looking ahead to the Fiscal Year 2006 budget planning cycle to establish the path ahead. The air force is seeking a portfolio of capabilities that would give it the reach, capacity for precision delivery and persistence to dominate future battlefields and destroy targets. Talk of future capabilities should not diminish the significance of the improvements that the air force has made to its existing long-range strike capabilities.

Narrowing the global-strike gap with an airborne aircraft carrier

Article

Jun 2005

George D. Kramlinger

The United States faces a global-strike gap if it confronts a vast and well-defended adversary in an access-challenged theater halfway around the world. To close this gap, the Air Force should develop a fleet of airborne aircraft carriers to transport stealthy fighters and unmanned combat aerial vehicles over global range to protect, augment, and support the limited B-2 fleet.

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Article

Do what you did four quarters ago: Trends and implications of quarterly dividends

June 2017 · Journal of Corporate Finance

By analyzing the inter-temporal structure of quarterly dividends, we show that as more firms announce dividend increases exactly every four quarters, dividend policy has become more persistent and more predictable. Recently, nearly 60% of all dividend increases have been announced in four-quarter cycles. Valuation, earnings stability, and size are positively related to the propensity to adopt ... [Show full abstract] four-quarter cycles. More importantly, we provide evidence that this structure is incorporated into market participants’ expectations about future dividend announcements. These findings may provide an explanation for two phenomena described in the literature: the declining information content of dividends and the higher degree of dividend smoothing.

Article

Full-text available

Experimental Research on New Concrete Air Entraining Agent

February 2011 · Advanced Materials Research

Using waste to produce a new type of air entraining agent (AEA), carrying out research of the concrete’s mixture performance, mechanical properties and frost resistance durability after mixing with the AEA, with results showing that amount of air entrained in the concrete mixture and the water reducing rate increases along with the increase of the addition of the new AEA, and its compressive ... [Show full abstract] strength loss laws are similar with that of normal AEAs. During the frost-thaw cycle test, when the weight loss rate has reached its limit, concrete with the new AEA added can withstand almost 300 cycles, and at this time the relative dynamic modulus of the concrete, when the amount of air entrained in it is 4.5%, is 83.5%, and the relative dynamic modulus is 85.4% when the amount of air entrained is 5.3%. The addition of the AEA has obviously improved the pore structure of the concrete, and significantly raising its frost resistance durability.

Article

Oceanic Tides

January 2013 · Lecture Notes in Physics

The phenomena of tides are a matter of common experience: ocean tides under the influence of the Moon and the Sun, differences of the surface level of the oceans reaching several meters, following well-established cycles. In the present chapter we propose a first step in the general and classical mathematical formulations of the tidal potential and tidal force. Then we apply this formulation to ... [Show full abstract] the concrete case of the lunisolar ocean tides at a given point of the surface of the sea. At the end we give a review of various tidal manifestations all around the world.

Article

Precision Measurements of Khz Qpos and Their Sidebands in Atoll Sources

January 2001

Michiel van der Klis

Precision measurements of kHz QPO properties have proven to be the best tool for testing models for kHz QPOs and using them to reach conclusions about fundamental physical issues. An recent example of the success of precision measurements is the discovery of the first kHz QPO sidebands as part of our ongoing program in Cycle 5. One of the possible interpretations of these sidebands involves ... [Show full abstract] Lense-Thirring precession due to the dragging of inertial frames caused by the neutron star spin. Such measurements can only be performed with RXTE. In order to obtain the required precision, very long observing times are required. We propose to perform such measurements on a group of four persistent kHz QPO sources which we carefully selected as the best suited for this work.

Article

Full-text available

The Cyclic Loading as a Result of the Stick-Slip Motion

March 2014 · Advanced Materials Research

We investigate the influence of oscillating normal force on the frictional sliding. Frictional sliding in the case of a simple mass-spring model of Burridge and Knopoff type demonstrates stick-slip even when the friction coefficient is constant. Oscillations of the normal force in this case do not produce noticeable changes in the stick-slip sliding mode. A completely different picture is ... [Show full abstract] observed when the oscillations of normal force are applied to the system, which is in the state of steady sliding. In this case the normal oscillations turn the steady sliding into stick slip. A special case is observed when the normal force oscillates with the eigen frequency of the stick-slip motion. Then, no matter how small the amplitude of oscillations is the system reaches the same final stick-slip regime. The time required to reach this limiting regime is inversely proportional to the amplitude of oscillations of the normal force.

Conference Paper

W-band 100W pulsed TWT amplifiers for power combining experiment

April 2014

W-band pulsed TWT Amplifiers have been developed as transmitters for weather radar of cloud detection. The test results show that two amplifiers can reach over 100W output power at 10% duty cycle in the air cooling condition.

Chapter

Full-text available

Matching Problems with Tools

November 2013

In order to provide a profound understanding of the use of tools, it is necessary to discuss them in the context of objectives that can be reached by their application. A tool and its mere application are not just self-contained. This becomes apparent when looking at the further development of Deming's famous PDCA cycle by Kaoru Ishikawa. He expanded the two steps Plan and Do by an extra step ... [Show full abstract] each, making six steps out of the four: Determine goals and targets, determine methods of reaching goals, engage in education and training, implement work, check the effects of implementation and take appropriate action. These kinds of cycles are typical for many approaches in quality management/improvement. It is a pragmatic step-by-step approach for collecting data, analyzing them and deriving solutions (Fig. 18.1).

Conference Paper

Generation of sub-two-cycle pulses in mid-infrared region by four-wave rectification in air

June 2008

Generation of mid-infrared pulses by four-wave mixing through filamentation in air has been demonstrated. The pulse width was measured as 13 fs, which corresponds to 1.3 optical cycles. The output energy reaches 1.5 muJ.

Article

MI high power operation and future plans

January 1970

I. Kourbanis

Fermilab's Main Injector on acceleration cycles to 120 GeV has been running a mixed mode operation delivering beam to both the antiproton source for pbar production and to the NuMI[1] target for neutrino production since 2005. On January 2008 the slip stacking process used to increase the beam to the pbar target was expanded to include the beam to the NuMI target increasing both the beam ... [Show full abstract] intensity and power. The current high power MI operation will be described along with the near future plans.

Article

Ignition of gases by two successive sparks with reference to frequency effect of capacitance sparks

August 1976 · Combustion and Flame

The fact that the igniting ability of a capacitance spark increases as the frequency of an oscillatory discharge decreases has been previously ascertained down to about 260 kHz. The present study was undertaken to investigate how matters stand at lower frequencies. In the experiments using lean propaneair mixtures, the igniting ability of a capacitance spark is found to reach a maximum at a ... [Show full abstract] frequency of about 100 kHz. In order to elucidate the mechanism of such a frequency effect, two successive sparks of very short duration, which pass across the gap at a controllable time interval, are used as substitutes for halves of the first cycle of an oscillatory discharge. The experimental results show that the igniting ability of two successive sparks is highest at an interval of 10 to 50 μsec, which corresponds to a frequency of 50 to 10 kHz for the oseillatory discharge. This fact suggests that the discharge frequency rather than the spark duration is the predominant factor in ignition by a capacitance spark. A simplified thermal theory taking into consideration the shape and behavior of a spark kernel is given to explain the effect of frequency on the igniting ability of capacitance sparks.

Article

WHAT HAS HAPPENED TO THE CYCLE?

April 1987 · Economic Outlook

Geoffrey Dicks

The Chancellor reminded us in his Budget speech that “the British economy is now embarking on its seventh successive year of steady growth, at an average rate of getting on for 3 per cent a year”. This experience contrasts markedly with that of the 1970s and is dissimilar from that of the 1960s. Here we examine the recent behaviour of the economy, particularly with regard to the cycle. We ... [Show full abstract] conclude that the cycle is not dead and that since the trough of 1981 the economy has passed through two further turning points. If a correction is made for the miners' strike, activity peaked in late 1984, reached a trough in 1985 and is currently once more growing at an above-trend rate.

Article

The Key Role of Air Power in the Defence of Australia

April 1993

Kenneth N. Birrer

The defence of the island continent of Australia poses difficult problems for its population of 17 million people. While there are no aggressors on the horizon, the defence of the country requires a clear focus to put in place an effective defence at a time of continuing resource constraints. Air power assumes a key role in the defence of Australia because its characteristics, such as mobility, ... [Show full abstract] flexibility, versatility, speed of response and reach, are well-matched to Australia's unique situation. While the defence of the sea-air gap to the north remains the prime consideration for defence planners, a task for which air power is well-suited, an offensive strategic strike capability is essential. The flexible strike capability provided by airpower can deter enemies, allow the initiative to be regained and the risks of gradual attrition of friendly forces to be avoided.