Effects of the pipe-joints on acoustic emission wave propagation velocity

In jointed-pipes, a variety of different acoustic emission (AE) waves can be generated by way of mode conversion, wave reflection and wave transmission from a joint. This can lead to interference waves as resulting complicated signals propagate along the pipe structure. To find out how the joint affects AE wave propagation in the jointedpipes, experiments were conducted on a thin-walled copper pipes connected with two types of joint, compression and soldered. By using wavelet packet decomposition (WPD) analysis and the time-of-flight method, the apparent velocity of AE waves near the joints could be estimated as a narrow frequency band individually. Results confirmed that the wave velocities determined near a joint were influenced by not only the wave reflection but also the wave transmission. The measured wave velocity was least affected by those for the wave in the low frequency band (<125 kHz). It was also observed that a compression or soldered joint behaved like a low-pass filter to the transmitted AE signal

Interface creation and stress dynamics in plasma-deposited silicon dioxide films

The stress in amorphous silicon dioxide filmgrown by plasma-assisted deposition was investigated both during and after film growth for continuously and intermittently depositedfilms. It is shown that an intermittent deposition leads to the creation of interfacial regions during film growth, but also causes dynamical structural change in already-deposited film which results in a significantly different stress-thickness profile measured after deposition.Film growth in the continuously depositedfilm was also monitored using an in situ laser reflection technique, and a strong change in stress was detected at about 145nm which was attributed to the onset of island coalescence

I am not just a nurse: The need for a boundaried ethic of care in the context of prolific relationality

The Ethics of Care (EoC) theory has been widely applied in the field of management, and there is a growing consensus that it is important to recognise the value and practice of care in the workplace. In this paper, we consider the implications of the EoC at work, and in particular the risks unboundaried care demands may pose to employees who encounter unmanageable ‘calls to care’. We present findings from interviews with 27 nurses in Malaysia, which suggest that the demand to care at work, in addition to demands made in the non-work sphere, may be unmanageable. We argue for a more boundaried approach to the EoC at work with a view to ensuring that in valuing care we do not over-burden the carer

Systematic description and key to isolants from Atacama Desert, Chile

Isolation and identification of desert soil microorganism from Chil

Modeling Lifetime Earnings Paths: Hypothetical versus Actual Workers

To assess the distributional effects of social security reform proposals, it is essential to have good information on real-world workers’ lifetime earnings trajectories. Until recently, however, policymakers have relied on hypothetical earnings profiles for policy analysis. We use actual lifetime earnings data from the Health and Retirement Study (HRS) to compare actual workers’ covered earnings profiles to these hypothetical profiles. We show that the hypothetical profiles do not track earnings patterns of current retirees; thus lifetime pay levels are much higher than for most HRS workers. Therefore, using hypothetical profiles could misrepresent benefits paid and taxes collected under such reforms.

Lifetime Earnings Variability and Retirement Wealth

This paper explores how earnings variability is related to retirement wealth. Past research has demonstrated that the average American household on the verge of retirement would need to save substantially more, in order to preserve consumption flows in old age. While several socioeconomic factors have been examined that might explain such problems, prior studies have not assessed the role of earnings variability over the lifetime as a potential explanation for poor retirement prospects. Thus two workers having identical levels of average lifetime earnings might have had very different patterns of earnings variability over their lifetimes. Such differences could translate into quite different retirement wealth outcomes. This paper evaluates the effect of earnings variability on retirement wealth using information supplied by respondents to the Health and Retirement Study (HRS). This is a rich and nationally representative dataset on Americans on the verge of retirement, with responses linked to administrative records from the Social Security Administration. Our research illuminates the key links between lifetime earnings variability and retirement wealth.

Remote sensing of Pacific hurricane and radiometric measurements from foam and slicks

There are no author-identified significant results in this report