Electron-polaron--electron-polaron bound states in mass-gap graphene-like planar quantum electrodynamics: ss-wave bipolarons

A Lorentz invariant version of a mass-gap graphene-like planar quantum electrodynamics, the parity-preserving $U(1)\times U(1)$ massive QED$_3$, exhibits attractive interaction in low-energy electron-polaron--electron-polaron $s$-wave scattering, favoring quasiparticles bound states, the $s$-wave bipolarons.Comment: 6 pages, two figures, references adde

Energy rating of a water pumping station using multivariate analysis

Among water management policies, the preservation and the saving of energy demand in water supply and treatment systems play key roles. When focusing on energy, the customary metric to determine the performance of water supply systems is linked to the definition of component-based energy indicators. This approach is unfit to account for interactions occurring among system elements or between the system and its environment. On the other hand, the development of information technology has led to the availability of increasing large amount of data, typically gathered from distributed sensor networks in so-called smart grids. In this context, data intensive methodologies address the possibility of using complex network modeling approaches, and advocate the issues related to the interpretation and analysis of large amount of data produced by smart sensor networks. In this perspective, the present work aims to use data intensive techniques in the energy analysis of a water management network. The purpose is to provide new metrics for the energy rating of the system and to be able to provide insights into the dynamics of its operations. The study applies neural network as a tool to predict energy demand, when using flowrate and vibration data as predictor variables

Comparing Generational Differences in Job Satisfaction and Retention (Anticipated Turnover) Among Nurses Working in Magnet Versus Non-Magnet Designated Hospitals

Background and Purpose of the Study: Experts in the nursing profession predict a catastrophic nursing shortage by 2025. Nursing shortages have devastating effects on hospitals from a quality of care, patient and family satisfaction and financial perspectives. Given these issues, the most logical approach to this shortage is retention of nurses rather than recruitment. The Magnet designation is one mechanism to retain nursing staff. Another phenomenon exists within the work environment that makes this shortage different from others. Currently, there are four generations of nurses working in the healthcare environment. Each of these generational cohorts has different values and beliefs that have been shaped by significant events in their generational timeframe. These values and beliefs affect their attitude about work and life in general. Although there are a number of research studies regarding influence of the Magnet designation on job satisfaction, there are no studies that evaluate these attributes from the context of the generational cohorts as well. Purpose: The purpose of this study was to determine if there were differences in job satisfaction as measured by positive work attributes and potential turnover among the four generations of nurses working in Magnet and non-Magnet designated hospitals. Methods: Registered professional nurses in eight New Jersey hospitals (four Magnet and four non-Magnet designated hospitals) were surveyed using the Nursing Work Index – Revised which measures positive work attributes and the Anticipated Turnover Scale which measures potential turnove

Comparing Generational Differences in Job Satisfaction and Retention (Anticipated Turnover) Among Nurses Working in Magnet Versus Non-Magnet Designated Hospitals

Background and Purpose of the Study: Experts in the nursing profession predict a catastrophic nursing shortage by 2025. Nursing shortages have devastating effects on hospitals from a quality of care, patient and family satisfaction and financial perspectives. Given these issues, the most logical approach to this shortage is retention of nurses rather than recruitment. The Magnet designation is one mechanism to retain nursing staff. Another phenomenon exists within the work environment that makes this shortage different from others. Currently, there are four generations of nurses working in the healthcare environment. Each of these generational cohorts has different values and beliefs that have been shaped by significant events in their generational timeframe. These values and beliefs affect their attitude about work and life in general. Although there are a number of research studies regarding influence of the Magnet designation on job satisfaction, there are no studies that evaluate these attributes from the context of the generational cohorts as well. Purpose: The purpose of this study was to determine if there were differences in job satisfaction as measured by positive work attributes and potential turnover among the four generations of nurses working in Magnet and non-Magnet designated hospitals. Methods: Registered professional nurses in eight New Jersey hospitals (four Magnet and four non-Magnet designated hospitals) were surveyed using the Nursing Work Index – Revised which measures positive work attributes and the Anticipated Turnover Scale which measures potential turnove

Ghost free dual vector theories in 2+1 dimensions

We explore here the issue of duality versus spectrum equivalence in abelian vector theories in 2+1 dimensions. Specifically we examine a generalized self-dual (GSD) model where a Maxwell term is added to the self-dual model. A gauge embedding procedure applied to the GSD model leads to a Maxwell-Chern-Simons (MCS) theory with higher derivatives. We show that the latter contains a ghost mode contrary to the original GSD model. On the other hand, the same embedding procedure can be applied to $N_f$ fermions minimally coupled to the self-dual model. The dual theory corresponds to $N_f$ fermions with an extra Thirring term coupled to the gauge field via a Pauli-like term. By integrating over the fermions at $N_f\to\infty$ in both matter coupled theories we obtain effective quadratic theories for the corresponding vector fields. On one hand, we have a nonlocal type of the GSD model. On the other hand, we have a nonlocal form of the MCS theory. It turns out that both theories have the same spectrum and are ghost free. By figuring out why we do not have ghosts in this case we are able to suggest a new master action which takes us from the local GSD to a nonlocal MCS model with the same spectrum of the original GSD model and ghost free. Furthermore, there is a dual map between both theories at classical level which survives quantum correlation functions up to contact terms. The remarks made here may be relevant for other applications of the master action approach.Comment: 15 pages, 1 figur

Assessment of crash fire hazard of LH sub 2 fueled aircraft

The relative safety of passengers in LH2 - fueled aircraft, as well as the safety of people in areas surrounding a crash scene, has been evaluated in an analytical study. Four representative circumstances were postulated involving a transport aircraft in which varying degrees of severity of damage were sustained. Potential hazard to the passengers and to the surroundings posed by the spilled fuel was evaluated for each circumstance. Corresponding aircraft fueled with liquid methane, Jet A, and JP-4 were also studied in order to make comparisons of the relative safety. The four scenarios which were used to provide a basis for the evaluation included: (1) a small fuel leak internal to the aircraft, (2) a survivable crash in which a significant quantity of fuel is spilled in a radial pattern as a result of impact with a stationary object while taxiing at fairly low speed, (3) a survivable crash in which a significant quantity of fuel is spilled in an axial pattern as a result of impact during landing, and (4) a non-survivable crash in which a massive fuel spill occurs instantaneously

Slurry-Based 3DP and Fine Ceramic Components

Slurry-based 3DPTM (S-3DPÔ) is a solid freeform fabrication technique developed at MIT for production of fine ceramic components with complex geometries and fired densities in excess of 99% of theoretical density. Current research involves identification of the factors controlling minimum feature size in S-3DPTM. The ink-jet printed binder droplet size is the primary factor controlling the minimum feature dimension when deposited on the powder layers. For a given droplet size, however, a balance between spreading of the binder solution on the surface of the S3DPTM powderbed and infiltration determine the feature size, while interactions between the polymeric binder and the powder surface (polymer adsorption) control the minimum feature cross-section. Droplet-on-demand printing of the binder solution has been introduced to improve resolution, decreasing the minimum feature width from 300 mm to less than 150 mm.Mechanical Engineerin

Global periodicity conditions for maps and recurrences via Normal Forms

We face the problem of characterizing the periodic cases in parametric families of (real or complex) rational diffeomorphisms having a fixed point. Our approach relies on the Normal Form Theory, to obtain necessary conditions for the existence of a formal linearization of the map, and on the introduction of a suitable rational parametrization of the parameters of the family. Using these tools we can find a finite set of values p for which the map can be p-periodic, reducing the problem of finding the parameters for which the periodic cases appear to simple computations. We apply our results to several two and three dimensional classes of polynomial or rational maps. In particular we find the global periodic cases for several Lyness type recurrences.Comment: 25 page