Dynamical Reduction Models: present status and future developments

We review the major achievements of the dynamical reduction program, showing why and how it provides a unified, consistent description of physical phenomena, from the microscopic quantum domain to the macroscopic classical one. We discuss the difficulties in generalizing the existing models in order to comprise also relativistic quantum field theories. We point out possible future lines of research, ranging from mathematical physics to phenomenology.Comment: 12 pages. Contribution to the Proceedings of the "Third International Workshop DICE2006", Castello di Piombino (Tuscany), September 11-15, 2006. Minor changes mad

On the Electromagnetic Properties of Matter in Collapse Models

We discuss the electromagnetic properties of both a charged free particle, and a charged particle bounded by an harmonic potential, within collapse models. By choosing a particularly simple, yet physically relevant, collapse model, and under only the dipole approximation, we are able to solve the equation of motion exactly. In this way, both the finite time and large time behavior can be analyzed accurately. We discovered new features, which did not appear in previous works on the same subject. Since, so far, the spontaneous photon emission process places the strongest upper bounds on the collapse parameters, our results call for a further analysis of this process for those atomic systems which can be employed in experimental tests of collapse models, as well as of quantum mechanics.Comment: 17 pages, LaTeX, updated version with minor change

Does the Targeted Jobs Tax Credit Create Jobs at Subsidized Firms?

This paper uses the results of a survey of more than 3,500 private employers to determine whether use of the Targeted Jobs Tax Credit (TJTC) alters the level of a firm\u27s employment and/or whom the firm hires. We estimate that each subsidized hire generates between .13 and .3 new jobs at a participating firm. Use of the program also appears to induce employers to hire more young workers (age 25 and under). Our results suggest, however, that at least 70 percent of the tax credits granted employers are payments for workers who would have been hired even without the subsidy. Such payments represent mere transfers to employers

The Hilbert space operator formalism within dynamical reduction models

Unlike standard quantum mechanics, dynamical reduction models assign no particular a priori status to `measurement processes', `apparata', and `observables', nor self-adjoint operators and positive operator valued measures enter the postulates defining these models. In this paper, we show why and how the Hilbert-space operator formalism, which standard quantum mechanics postulates, can be derived from the fundamental evolution equation of dynamical reduction models. Far from having any special ontological meaning, we show that within the dynamical reduction context the operator formalism is just a compact and convenient way to express the statistical properties of the outcomes of experiments.Comment: 25 pages, RevTeX. Changes made and two figures adde

Restricting the Miranda Presumption and Pruning the Poisonous Tree: Oregon v. Elstad

The Elstad decision is significant because the Court eliminated the fruit of the poisonous tree doctrine with regard to Miranda violations, if the secondary evidence is a subsequent confession. As a result of Elstad, before a court will apply the derivative evidence rule to the secondary evidence, a suspect in custody must prove there was actual coercion by the police when they obtained the initial statement. This Note will discuss the Elstad decision and the impact it will have on criminal procedure

Reply to Comments of Bassi, Ghirardi, and Tumulka on the Free Will Theorem

We show that the authors in the title have erred in claiming that our axiom FIN is false by conflating it with Bell locality. We also argue that the predictions of quantum mechanics, and in particular EPR, are fully Lorentz invariant, whereas the Free Will Theorem shows that theories with a mechanism of reduction, such as GRW, cannot be made fully invariant.Comment: We sharpen our theorem by replacing axiom FIN by a weaker axiom MIN to answer the above authors' objection

Low latitude middle atmosphere ionization studies

Low latitude middle atmosphere ionization was studied with data obtained from three blunt conductivity probes and one Gerdien condenser. An investigation was conducted into the effects of various ionization sources in the 40 to 65 Km altitude range. An observed enhancement of positive ion conductivity taking place during the night can be explained by an atmsopheric effect, with cosmic rays being the only source of ionization only if the ion-ion recombination coefficient (alpha sub i) is small(10 to the -7 power cu cm/s) and varies greatly with altitude. More generally accepted values of alpha sub i ( approximately equal to 3x10 to the -7 power cu cm/s) require an additional source of ionization peaking at about 65 Km, and corresponding approximately to the integrated effect of an X-ray flux measured on a rocket flown in conjunction with the ionization measurements. The reasonable assumption of an alpha sub i which does not vary with altitude in the 50-70 Km range implies an even greater value alpha sub i and a more intense and harder X-ray spectrum

The use of circular economy practices in SMEs across the EU

This study explores the circular economy (CE) practices of Small and Medium Enterprises (SMEs) in the 28 European Union (EU) member states. Five measures of CE are studied, namely Re-planning the way water is used to minimize usage and maximize re-usage, Using renewable energy, Re-planning energy usage to minimize consumption, Minimizing waste by recycling or reusing waste or selling it to another firm, and Redesigning products and services to minimize the use of materials or using recycled materials. Multilevel ordinal probit models that control within- and between-variability across European Union countries are estimated. Results show that CE measures across EU countries are very heterogeneous. At the firm level, we find that firm size (number of employees and total turnover in 2015) and percentage of firms’ turnover invested in R&D in 2015 are significant in explaining within-country variations. The multilevel structure (between-country variability) accounts for 6.1%–15.1% of the total variability of CE measures. These results have implications for the design of framework policies at EU level given that the firms surveyed are SMEs, the segment in which these CE measures most need improved planning and implementation.info:eu-repo/semantics/acceptedVersio

Tecnologias que promovem a biosseguridade na produção avícola.

bitstream/item/60179/1/CUsersPiazzonDocuments17236.pdfProjeto/Plano de Ação: 04.06.31.900-03