Asymptomatic congenital cystic adenomatoid malformation of the lung: Is it time to operate?

ObjectiveThe optimal management of congenital adenomatoid malformation of the lung remains controversial. Prenatal ultrasonographic analysis has increasingly discovered asymptomatic lesions, raising questions about the need for and timing of surgical treatment for asymptomatic congenital adenomatoid malformation. The aim of our study was to analyze the short-term postoperative outcome of symptomatic congenital adenomatoid malformations compared with asymptomatic malformations.MethodsAll the data of patients presenting with congenital adenomatoid malformations histologically diagnosed and operated on between 1998 and 2005 at our institution were retrospectively reviewed. Patients were divided into 2 groups: group A comprised asymptomatic infants, and group B comprised symptomatic infants. Major outcomes considered were the length of ventilation, pleural drainage, and hospital stay. Postoperative morbidity and mortality were also evaluated. Asymptomatic patients were further stratified for age at the time of the operation to evaluate whether age at surgical intervention affects the outcome. The Fisher's exact and Mann–Whitney tests were used as appropriate.ResultsFifty-seven patients were consecutively treated. Thirty-five patients were given diagnoses of asymptomatic lesions and were enrolled into group A, whereas 22 patients presenting with symptoms were entered into group B. The lengths of ventilation, pleural drainage, and hospital stay were significantly longer in patients with symptomatic congenital adenomatoid malformations. Moreover, symptomatic patients presented with a higher postoperative complication rate. The age-based stratification of asymptomatic children did not show any difference on either postoperative mortality or major outcome considered.ConclusionChildren with congenital adenomatoid malformations operated on when asymptomatic present a better short-term outcome than symptomatic children. In addition, age at the time of the operation does not negatively affect the outcome. Our findings support early surgical treatment for asymptomatic congenital adenomatoid malformation

Household income expectations: The role of income shocks and aggregate conditions

We conduct an empirical investigation to examine how income shocks and aggregate conditions influence income expectations, expectation uncertainty and expectation errors. We use data from a large longitudinal Dutch survey collecting detailed information on household income expectations. Our results show that income shocks, much more than aggregate conditions, induce a revision in income expectations across the entire spectrum of the income distribution. This expectation revision is consistent with an extrapolative behavior. We also observe that positive income shocks lead to an increase of expectation uncertainty. Our results partly confirm overreaction of respondents to income shocks, particularly for negative income shocks and high-income respondents. The above overall findings vary conditional on the position in the income distribution. This evidence may depend on different income processes and different degrees of awareness regarding the impact of income shocks and aggregate conditions

Improving the performance of printable carbon electrodes by femtosecond laser treatment

Low-cost carbon-conductive films were screen-printed on a Plexiglas® substrate, and then, after a standard annealing procedure, subjected to femtosecond (fs) laser treatments at different values of total accumulated laser fluence ΦA. Four-point probe measurements showed that, if ΦA > 0.3 kJ/cm2, the sheet resistance of laser-treated films can be reduced down to about 15 Ω/sq, which is a value more than 20% lower than that measured on as-annealed untreated films. Furthermore, as pointed out by a comprehensive Raman spectroscopy analysis, it was found that sheet resistance decreases linearly with ΦA, due to a progressively higher degree of crystallinity and stacking order of the graphitic phase. Results therefore highlight that fs-laser treatment can be profitably used as an additional process for improving the performance of printable carbon electrodes, which have been recently proposed as a valid alternative to metal electrodes for stable and up-scalable perovskite solar cells

Aluminum (Oxy)nitride thin films grown by fs-PLD as electron emitters for thermionic applications

Thin films based on aluminum nitride were obtained by fs-laser assisted Pulsed Laser Deposition (fs-PLD) at room temperature on tantalum substrates for studying the electron emission performance in the temperature range 700- 1600 °C, so to investigate the possibility of their exploitation as thermionic cathodes. Results of structural, chemical and morphological analyses show the growth of nanostructured thin films with a significant oxygen contamination, forming a mixture of crystalline aluminum nitride and aluminum oxide as well as metallic aluminum inclusions. Despite the considerable presence of oxygen, the developed cathodes demonstrate to possess promising thermionic emission characteristics, with a work function of 3.15 eV, a valuable Richardson constant of 20.25 A/(cm²K²), and a highly thermo-electronic stability up to operating temperatures of 1600 °C

Roadmap on thermoelectricity

The increasing energy demand and the ever more pressing need for clean technologies of energy conversion pose one of the most urgent and complicated issues of our age. Thermoelectricity, namely the direct conversion of waste heat into electricity, is a promising technique based on a long-standing physical phenomenon, which still has not fully developed its potential, mainly due to the low efficiency of the process. In order to improve the thermoelectric performance, a huge effort is being made by physicists, materials scientists and engineers, with the primary aims of better understanding the fundamental issues ruling the improvement of the thermoelectric figure of merit, and finally building the most efficient thermoelectric devices. In this Roadmap an overview is given about the most recent experimental and computational results obtained within the Italian research community on the optimization of composition and morphology of some thermoelectric materials, as well as on the design of thermoelectric and hybrid thermoelectric/photovoltaic devices

Locus of control, savings and propensity to save

We study the relationship between saving choices and a key psychological characteristic such as locus of control using data from a longitudinal survey representative of the Dutch population. Locus of control measures the extent to which individuals perceive their life outcomes to be determined by their own actions, as opposed to external factors. Our findings show that those who believe to be in control of future outcomes save more, both at the extensive(probability to save) and intensive margins (amount of savings). We also investigate the mechanisms behind the relationship. Locus of control may affect both the propensity to save for general purposes and savings to achieve a specific purchase goal (e.g.buying a house). We find that both channels are significant, the latter being more sizeable

Locus of Control and Saving: The Role of Saving Motives

Using data from a longitudinal survey representative of the Dutch population, we analyze the relationship between saving and locus of control, and we study the underlying mechanisms. Locus of control measures the extent to which individuals perceive their life outcomes to be determined by their own actions, as opposed to external factors. Those who believe to be in control of future outcomes turn out to save more, both at the extensive (decision to save) and intensive margins (amount saved). We investigate the mechanisms behind this relationship. We implement a mediation analysis to examine the role of saving motives, distinguishing between specific and non-specific purposes. The effect of external locus of control is direct, while the effect of internal locus of control is indirect, largely driven by (non-specific) saving motives

Locus of control and saving: the role of saving motives

Using data from a longitudinal survey representative of the Dutch population, we analyze the relationship between saving and locus of control, and we study the underlying mechanisms. Locus of control measures the extent to which individuals perceive their life outcomes to be determined by their own actions, as opposed to external factors. Those who believe to be in control of future outcomes turn out to save more, both at the extensive (decision to save) and intensive margins (amount saved). We investigate the mechanisms behind this relationship. We implement a mediation analysis to examine the role of saving motives, distinguishing between specific and non-specific purposes. The effect of external locus of control is direct, while the effect of internal locus of control is indirect, largely driven by (non-specific) saving motives

Household income expectations: The role of shocks and aggregate conditions

We conduct an empirical investigation to examine how income shocks and aggregate conditions influence income expectations, expectation uncertainty and expectation errors. We use data from a large longitudinal Dutch survey collecting detailed information on household income expectations. Our results show that income shocks, much more than aggregate conditions, induce a revision in income expectations across the entire spectrum of the income distribution. This expectation revision is consistent with an extrapolative behavior. We also observe that positive income shocks lead to an increase of expectation uncertainty. Our results partly confirm overreaction of respondents to income shocks, particularly for negative income shocks and high-income respondents. The above overall findings vary conditional on the position in the income distribution. This evidence may depend on different income processes and different degrees of awareness regarding the impact of income shocks and aggregate conditions