The (long) run out of unemployment: are temporary jobs the shortest way?

A higher job creation is a common result by many theoretical approaches trying to model marginal labor market reforms. In the framework proposed by Berton and Garibaldi [2006], in particular, the equilibrium arrival rate of temporary job offers is expected to be higher than the arrival rate of permanent ones. In this paper I use a sample of prime aged male workers from WHIP in a competing risks framework in order to compare the duration of unemployment spells terminated by jobs that only di¤er in their formal duration. I fnd that the arrival rate of fixed term jobs is actually larger than the arrival rate of permanent ones; this result is robust to the main sources of unobserved heterogeneity. However, the average duration of unemployment in Italy is still very high and the liberalization of flexible contracts as a policy to reduce it did not completely solve the problem.temporary jobs, unemployment duration, competing risks.

Divergence thrust loss calculations for convergent-divergent nozzles: Extensions to the classical case

The analytical derivations of the non-axial thrust divergence losses for convergent-divergent nozzles are described as well as how these calculations are embodied in the Navy/NASA engine computer program. The convergent-divergent geometries considered are simple classic axisymmetric nozzles, two dimensional rectangular nozzles, and axisymmetric and two dimensional plug nozzles. A simple, traditional, inviscid mathematical approach is used to deduce the influence of the ineffectual non-axial thrust as a function of the nozzle exit divergence angle

Legislative lobbying under political uncertainty

In this paper we develop a duopolistic model of legislative lobbying. Two lobbies compete to influence the votes of a group of legislators who have a concern for both social welfare and campaign contributions. The type of a legislator is the relative weight he/she places on social welfare as compared to money. We study the equilibria of this lobbying game under political certainty and uncertainty and examine the circumstances under which the policy is socially efficient, and the amount of money that has been invested in the political process. Special attention is paid to three primitives of the environment: the intensity of the competition between the lobbies, the internal organisation of the legislature and the proportion of bad and good legislators in the political area

Vegetative incompatibility and potential involvement of a mycovirus in the Italian population of Geosmithia morbida

Studies carried out during an Italian outbreak of the Thousand Cankers Disease of walnut, demonstrated that non-coalescing cankers on host plants, separated by equidistant uninfected zones, were associated with incompatible strains of Geosmithia morbida. Confirmation of the vegetative incompatibility of paired fungal isolates, randomly collected from black walnuts, was obtained from observations of a clear separation zones and the absence of anastomoses. Pairing tests with two incompatible monoconidial strains indicated differences in morphology and growth rates. Electron microscopy revealed the presence of icosahedral mycovirus-like particles in one of the monoconidial strains that demonstrated low degrees of virulence in planta compared with a particlefree monoconidial strain. The occurrence of a vegetative incompatibility system in recently introduced populations of G. morbida has considerable implications for fungal biology. Incompatibility in G. morbida and potential direct or indirect roles of the observed virus-like particles have potential ecological and epidemiological consequences. \ua9 Firenze University Press

Are Temporary Jobs a Port of Entry into Permanent Employment? Evidence from Matched Employer-Employee Data

Are temporary jobs a port of entry into permanent employment? In this paper we argue that the answer crucially depends on the type of temporary contracts being considered, as the different contracts observed in practice are typically characterized by varying combinations of training, tax-incentives and EPL provisions. We base our empirical evidence on a longitudinal sample of labour market entrants in Italy, a country where a large number of temporary contracts coexist with a relatively high employment protection for standard employees. We estimate dynamic multinomial logit models with fixed effects, to allow for non-random sorting of workers into the different types of contracts. We show that the transition to permanent employment is more likely for individuals holding any type of temporary contracts than for the unemployed, thus broadly confirming the existence of port-of-entry effects. Yet, not all temporary contracts are the same: training contracts are the best port of entry, while freelance contracts are the worst. We also show that temporary contracts are generally a port-of-entry into a permanent position within the same employer, but not across firms, implying that little general-purpose training is gained while on temporary jobs. Moreover, the time needed for an internal transformation from a temporary to a permanent position appears rather long, suggesting that firms are likely to use (a sequence of) temporary contracts as a cost-reduction strategy, rather than as a screening device for newly hired workers.temporary jobs, port of entry, matched employer-employee data, dynamic multinomial logit models, state dependence, fixed effects

An interactive preprocessor for the NASA engine performance program

The Simplified NEPP Automated Preprocessor (SNAP), which is written to aid in the preparation of input data files for the NASA Engine Performance Program (NEPP), is described. Specifically, SNAP is a software package on the Virtual Machine operating system that prompts the NEPP user for input information via a series of menus. The data collected from these menus are assimilated into an input file suitable for the running of NEPP. SNAP acts as a user-friendly preprocessing interface for NEPP. This serves as an introduction to the SNAP software, a user's manual, a description of the program logic, and a maintenance manual for future modifications to the software

Temporary jobs: Port of entry, Trap, or just Unobserved Heterogeneity?

We use a 1998 - 2004 sample from WHIP in order to study the labor market transitions of young entrants. We consider seven labor market tates: permanent and temporary employment, apprenticeship, training pogrammes, self employment, quasi subordinate jobs and unemployment. After controlling for individual ?xed e¤ects in a dynamic multinomial logit framework, we ?nd that heterogeneity partially explains workers' sorting among the contracts. State dependence exists in all the labor market states, but CFLs, apprenticeship and temporary jobs also represent a port of entry towards permanent employment. Length: 22 pagestemporary jobs, port of entry, state dependence

Jet Noise Prediction Comparisons with Scale Model Tests and Learjet Flyover Data

Recent interest in commercial supersonic flight has highlighted the need to accurately predict Effective Perceived Noise Levels (EPNL) for aircraft and, since the dominant noise source at takeoff will likely be jet noise, specifically jet noise contributions. The current study compares predictions from historical jet-noise models within NASAs Aircraft Noise Prediction Program and scale-model data to measurements made in a Learjet 25 flight test. The noise levels from the predictions and scale-model data were below those for the flight data by 2.5 3.5, 1 2, and 3 5 EPNdB for the SAE model, the Stone Jet model, and the scale-model data, respectively. Tones and broadband haystacks were identified in the flight spectra that are not associated with jet noise which increased the flight EPNL by at least 0.5 EPNdB over that computed from spectra with the tones and haystacks removed. The study highlights the need for accurate exhaust temperature measurements, aircraft flight position information, and averaging data across a line of microphones in flight tests. For example, a 100 F to 200 F difference in jet exhaust temperature is enough to explain the differences between flight, model scale, and prediction comparisons

An orientation-based unification of young jetted AGN: the case of 3C 286

In recent years, the old paradigm according to which only high-mass black holes can launch powerful relativistic jets in active galactic nuclei (AGN) has begun to crumble. The discovery of $\gamma$-rays coming from narrow-line Seyfert 1 galaxies (NLS1s), usually considered young and growing AGN harboring a central black hole with mass typically lower than 10$^8$ M$_\odot$, indicated that also these low-mass AGN can produce powerful relativistic jets. The search for parent population of $\gamma$-ray emitting NLS1s revealed their connection with compact steep-spectrum sources (CSS). In this proceeding we present a review of the current knowledge of these sources, we present the new important case of 3C 286, classified here for the fist time as NLS1, and we finally provide a tentative orientation based unification of NLS1s and CSS sources.Comment: 12 pages, 3 figures. Proceeding of the conference "Quasars at all cosmic epochs", held in Padova, April 2-7, 2017, published on Frontiers in Astronomy and Space Science