scholarly journals Development and validation of a full-time-scale semi-analytical model for the short- and long-term simulation of vertical geothermal bore fields

Geothermics ◽  
2020 ◽  
Vol 86 ◽  
pp. 101788 ◽  
Author(s):  
Alex Laferrière ◽  
Massimo Cimmino ◽  
Damien Picard ◽  
Lieve Helsen
Keyword(s):  
Analytical Model ◽  
Time Scale ◽  
Full Time ◽  
Short And Long Term ◽  
Development And Validation

scholarly journals The Rate of Information Transfer of Naturalistic Stimulation by Graded Potentials

2003 ◽  
Vol 122 (2) ◽  
pp. 191-206 ◽  
Author(s):  
Mikko Juusola ◽  
Gonzalo G. de Polavieja
Keyword(s):  
Time Scale ◽  
Information Transfer ◽  
Bright Light ◽  
Scale Structure ◽  
Finite Duration ◽  
Adaptation Mechanisms ◽  
Short And Long Term ◽  
Signaling Strategies

We present a method to measure the rate of information transfer for any continuous signals of finite duration without assumptions. After testing the method with simulated responses, we measure the encoding performance of Calliphora photoreceptors. We find that especially for naturalistic stimulation the responses are nonlinear and noise is nonadditive, and show that adaptation mechanisms affect signal and noise differentially depending on the time scale, structure, and speed of the stimulus. Different signaling strategies for short- and long-term and dim and bright light are found for this graded system when stimulated with naturalistic light changes.

Use of a Residency Program in Preservice Teacher Preparation

2022 ◽  
pp. 93-103
Author(s):  
Kat D. Alves ◽  
Melissa K. Driver
Keyword(s):  
Preservice Teachers ◽  
Teacher Preparation ◽  
Special Education Teachers ◽  
Residency Program ◽  
First Year ◽  
Full Time ◽  
Preparation Programs ◽  
Residency Programs ◽  
Short And Long Term

The training and retention of special education teachers is a critical need in the education field. One innovation that can be used in educator preparation programs to better prepare teachers is to establish a residency model. In this model, preservice teachers work as full-time teachers, while also completing their coursework. They receive support from university faculty and peers during this structured first year of teaching. This chapter will explore the need for residency programs, possible features and structures, short and long-term benefits, and potential challenges. In addition, this chapter explores ways to incorporate high-leverage practices into residency coursework.

scholarly journals Full-Time-Scale Fluid-to-Ground Thermal Response of a Borefield with Uniform Fluid Temperature

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3750 ◽  
Author(s):  
Claudia Naldi ◽  
Enzo Zanchini
Keyword(s):  
Time Constant ◽  
Time Scale ◽  
Thermal Power ◽  
Thermal Response ◽  
Computation Time ◽  
Total Power ◽  
Fluid Temperature ◽  
Full Time ◽  
Uniform Fluid

The most accurate method for the design and the simulation of a borehole heat exchanger (BHE) field is employing the fluid-to-ground thermal response of the field, namely the mean-fluid-temperature rise produced by a time-constant thermal power supplied to the fluid. Usually, a short-term and a long-term model are applied, with results matched at a selected time instant. In this paper we propose a method to determine the full-time-scale thermal response of a BHE field that employs one numerical model and yields accurate results with a reasonable computation time. Each BHE is modeled as a one-material cylinder with the same radius as the BHE, surrounded by the ground and containing a heat-generating cylindrical surface whose temperature represents that of the fluid. The condition of uniform fluid temperature and time-constant total power supplied to the fluid, necessary for the long-term accuracy, is obtained iteratively, by imposing at the generating surface uniform time-dependent temperatures that converge to the desired condition. A 2 × 2 square BHE field is employed as an example. The method is recommended to obtain the thermal response of a BHE field with uniform fluid temperature, with high accuracy both in the short and in the long term.

scholarly journals Ubiquitous C IV 1550 Variability in B and Be Stars

1987 ◽  
Vol 92 ◽  
pp. 286-288 ◽  
Author(s):  
G. Sonneborn ◽  
M.P. Garhart ◽  
C.A. Grady
Keyword(s):  
Time Scale ◽  
High Dispersion ◽  
Be Stars ◽  
Line Profiles ◽  
Standard Star ◽  
B Stars ◽  
Short And Long Term ◽  
Resonance Transitions ◽  
Long Term Behavior

Studies of line profile variability of the ultraviolet 1550 Angstrom resonance transitions of C IV in Be stars (Sonneborn et al. 1986; Grady, et al. 1986a,b) have prompted an investigation into the short- and long-term behavior of the C IV lines in other types of B stars. We present examples of two well-studied Be stars, Omega Orionis and 66 Ophiuchi, and two non-Be stars, Beta Cephei and the standard star Zeta Cassiopeiae. Zeta Cas is also known to be a 53 Per variable (see Cox 1983). The IUE SWP high-dispersion spectra of Beta Cep and Zeta Cas have been obtained from the IUE archives. It has been known for some years that the C IV line profiles in Beta Cep vary in a time scale of several days (Fishel and Sparks, 1980). However, it came as a surprise to discover C IV variability in Zeta Cas. Available data allow us to set an upper limit of several months for the time scale of Zeta Cas C IV variability. The principal difference between the C IV variability in Be and non-Be stars appears to be the magnitude and velocity range of the effect.

scholarly journals Informal work, unemployment and health in Brazilian metropolitan areas, 1998 and 2003

2008 ◽  
Vol 24 (10) ◽  
pp. 2396-2406 ◽  
Author(s):  
Luana Giatti ◽  
Sandhi Maria Barreto ◽  
Cibele Comini César
Keyword(s):  
Labor Market ◽  
Social Security ◽  
Health Care Services ◽  
Health Indicators ◽  
Full Time ◽  
Metropolitan Regions ◽  
Representative Study ◽  
Market Status ◽  
Short And Long Term

This study investigates whether employment with no social security, as well as short and long term unemployment are associated with worse health among Brazilians. The representative study sample was taken from two National Health Surveys and included men aged between 15 and 64 who lived in one of the eight metropolitan regions of Brazil in 1998 (n = 31,870) and 2003 (n = 32,887). Both surveys showed that full and part time workers with no social security, as well as those in short and long term (> 12 months) unemployment had worse health indicators, regardless of age or schooling, when compared with full-time workers (> 40 hours/week) who had some form of social security through their employment. Hepatic cirrhosis was the disease most strongly associated with labor market status. Its prevalence was higher among individuals in long term unemployment and those with no social security. Labor market status was also negatively associated with the use of health care services, especially medical visits. The present study shows that the absence of social security at work, unemployment and length of unemployment, characterize heterogeneous groups of individuals in relation to health. Results reinforce the need to incorporate labor market status in research into health inequalities.

scholarly journals A Time Scales Approach to Coinfection by Opportunistic Diseases

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Marcos Marvá ◽  
Ezio Venturino ◽  
Rafael Bravo de la Parra
Keyword(s):  
Disease Transmission ◽  
Time Scale ◽  
Host Population ◽  
Short Term ◽  
Sis Model ◽  
Opportunistic Disease ◽  
Primary Disease ◽  
Secondary Disease ◽  
Short And Long Term

Traditional biomedical approaches treat diseases in isolation, but the importance of synergistic disease interactions is now recognized. As a first step we present and analyze a simple coinfection model for two diseases simultaneously affecting a population. The host population is affected by theprimary disease, a long-term infection whose dynamics is described by a SIS model with demography, which facilitates individuals acquiring a second disease,secondary(or opportunistic)disease. The secondary disease is instead a short-term infection affecting only the primary infected individuals. Its dynamics is also represented by a SIS model with no demography. To distinguish between short- and long-term infection the complete model is written as a two-time-scale system. The primary disease acts at the slow time scale while the secondary disease does at the fast one, allowing a dimension reduction of the system and making its analysis tractable. We show that an opportunistic disease outbreak might change drastically the outcome of the primary epidemic process, although it does among the outcomes allowed by the primary disease. We have found situations in which either acting on the opportunistic disease transmission or recovery rates or controlling the susceptible and infected population size allows eradicating/promoting disease endemicity.

A Comparative Study on the Time-Dependent Analysis of Composite Beams Using Available Modelling Techniques

2014 ◽  
Vol 553 ◽  
pp. 625-630
Author(s):  
Osvaldo Vallati ◽  
Fabrizio Gara ◽  
Gianluca Ranzi ◽  
Graziano Leoni
Keyword(s):  
Analytical Model ◽  
Composite Beams ◽  
The Finite Element Method ◽  
Continuous Beams ◽  
Modelling Techniques ◽  
Short And Long Term ◽  
Direct Stiffness ◽  
Term Analysis ◽  
Time Dependent Analysis

This paper presents a comparison of available numerical structural formulations for the short-and long-term analysis of composite beams with partial shear interaction. Four methods of analysis are considered and these include the finite difference method, the finite element method, the direct stiffness method and the exact analytical model. The results obtained using these formulations are compared qualitatively and their accuracy is estimated, adopting the exact analytical model as a benchmark reference with the objective of establishing the minimum spatial discretisations required to keep the error within an acceptable tolerance. These comparisons are carried out for two static configurations, i.e. simply-supported beams and propped cantilevers, from which the qualitative behaviour of these formulations in the modelling of continuous beams can also be deduced.

Short- and Long-Term Results of Total vs Subtotal Thyroid- ectomies in the Surgical Treatment of Graves' Disease

Swiss Surgery ◽  
2001 ◽  
Vol 7 (1) ◽  
pp. 20-24 ◽  
Author(s):  
Robert ◽  
Mariéthoz ◽  
Pache ◽  
Bertin ◽  
Caulfield ◽  
...  
Keyword(s):  
Recurrent Laryngeal Nerve ◽  
Nerve Palsy ◽  
Recurrent Laryngeal Nerve Palsy ◽  
Laryngeal Nerve ◽  
Long Term Results ◽  
Graves Disease ◽  
Laryngeal Nerve Palsy ◽  
Short And Long Term

Objective: Approximately one out of five patients with Graves' disease (GD) undergoes a thyroidectomy after a mean period of 18 months of medical treatment. This retrospective and non-randomized study from a teaching hospital compares short- and long-term results of total (TT) and subtotal thyroidectomies (ST) for this disease. Methods: From 1987 to 1997, 94 patients were operated for GD. Thirty-three patients underwent a TT (mostly since 1993) and 61 a ST (keeping 4 to 8 grams of thyroid tissue - mean 6 g). All patients had received propylthiouracil and/or neo-mercazole and were in a euthyroid state at the time of surgery; they also took potassium iodide (lugol) for ten days before surgery. Results: There were no deaths. Transient hypocalcemia (< 3 months) occurred in 32 patients (15 TT and 17 ST) and persistent hypocalcemia in 8 having had TT. Two patients developed transient recurrent laryngeal nerve palsy after ST (< 3 months). After a median follow-up period of seven years (1-15) with five patients lost to follow-up, 41 patients having had a ST are in a hypothyroid state (73%), thirteen are euthyroid (23%), and two suffered recurrent hyperthyroidism, requiring completion of thyroidectomy. All 33 patients having had TT - with follow-ups averaging two years (0.5-8) - are receiving thyroxin substitution. Conclusions: There were no instances of persistent recurrent laryngeal nerve palsy in either group, but persistent hypoparathyroidism occurred more frequently after TT. Long after ST, hypothyroidism developed in nearly three of four cases, whereas euthyroidy was maintained in only one-fourth; recurrent hyperthyroidy was rare.

Stability and Change in Emotional Intelligence: Exploring the Transition to Young Adulthood

2005 ◽  
Vol 26 (2) ◽  
pp. 100-106 ◽  
Author(s):  
James D.A. Parker ◽  
Donald H. Saklofske ◽  
Laura M. Wood ◽  
Jennifer M. Eastabrook ◽  
Robyn N. Taylor
Keyword(s):  
High School ◽  
Emotional Intelligence ◽  
Postsecondary Education ◽  
Life Transition ◽  
Full Time ◽  
Major Life ◽  
Long Term Stability ◽  
Time Period ◽  
Transition From High School

Abstract. The concept of emotional intelligence (EI) has attracted growing interest from researchers working in various fields. The present study examined the long-term stability (32 months) of EI-related abilities over the course of a major life transition (the transition from high school to university). During the first week of full-time study, a large group of undergraduates completed the EQ-i:Short; 32 months later a random subset of these students (N = 238), who had started their postsecondary education within 24 months of graduating from high school, completed the measures for a second time. The study found EI scores to be relatively stable over the 32-month time period. EI scores were also found to be significantly higher at Time 2; the overall pattern of change in EI-levels was more than can be attributed to the increased age of the participants.

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