Simultaneous Entry Research Articles

Campaign Finance Regulation with Competing Interest Groups

Regulatory caps on contributions to political campaigns are the cornerstones of campaign finance legislation in many established democracies, and their introduction is considered by most emerging ones. Are these regulations desirable? This paper studies contribution caps in a menu auction lobbying model with limited budgets and costly entry. In the absence of entry, contribution caps improve welfare by leveling the political playing field. With entry, however, a competition effect and a bargaining effect may arise, resulting in inefficient entry and exit decisions. In particular, a cap may lead to worse policies that the status quo; and even if better policies are chosen, the resulting gain in welfare may be more than offset by the entry costs. Regulation can also lead to the simultaneous entry of competing groups, creating costly rent-seeking on issues previously unaffected by lobbying.

Campaign finance regulation with competing interest groups

Regulatory caps on contributions to political campaigns are the cornerstones of campaign finance legislation in many established democracies, and their introduction is considered by most emerging ones. Are these regulations desirable? This paper studies contribution caps in a menu auction lobbying model with limited budgets and costly entry. In the absence of entry, contribution caps improve welfare by “leveling the political playing field”. With entry, however, a competition effect and a bargaining effect may arise, resulting in inefficient entry and exit decisions. In particular, a cap may lead to worse policies than the status quo; and even if better policies are chosen, the resulting gain in welfare may be more than offset by the entry costs. Regulation can also lead to the simultaneous entry of competing groups, creating costly rent-seeking on issues previously unaffected by lobbying.

Entry and market selection of firms: A laboratory study

We study how markets adjust to the entry of new firms under different conditions. Two incumbents face entry by three other firms. When firms’ costs are equal, entry always leads consumer surplus and profits to their equilibrium levels. When entrants are more efficient than incumbents, entry leads consumer surplus to equilibrium. With cost asymmetries, market behavior is satisfactory from the consumers’ standpoint but does not yield adequate signals to other potential entrants. Simultaneous entry is in the short run more favorable to consumers than sequential entry. A longer incumbency phase favors consumers after entry.

Correlates of Changes in Voluntary Physical Activity Associated with the Youth Fit for Life™ Intervention during After-School Care

Overweight in youth is increasing and physical inactivity has been implicated as a causal factor. An after-school care intervention, Youth Fit For Life, has been associated with significant improvements in physiological factors and frequency of moderate-to-vigorous physical activity voluntarily completed outside of structured settings. Correlates of the observed changes in physical activity amounts were, however, unknown. A multiple regression equation with simultaneous entry of sex, age, race, initial Body Mass Index, and initial frequency of voluntary physical activity as predictor variables for changes in physical activity was calculated on Euro-American and African-American participants ages 8 to 12 years (N=217). A statistically significant 16% of the variance in changes in frequency of voluntary physical activity over 12 wk. was accounted for, with only voluntary physical activity at baseline and age making significant, unique contributions. For participants either overweight or at risk for overweight (n=72), the changes in physical activity significantly correlated with changes in Body Mass Index. Implications of findings to maximize treatment effects on voluntary physical activity were suggested.

Early phonological and sociocognitive skills as predictors of later language and social communication outcomes

Previous studies of outcome for children with early language delay have focused on measures of early language as predictors of language outcome. This study investigates whether very early processing skills (VEPS) known to underpin language development will be better predictors of specific language and social communication outcomes than measures of language itself. Participants were 163 children referred to clinical services with concerns about language at 2;6-3;6 years and followed up at 4-5 years. Novel assessments of phonological and sociocognitive processing were administered at Time 1 (T1), together with a standardised test of receptive and expressive language, and parental report of expressive vocabulary. The language test was re-administered at Time 2 (T2), together with assessments of morphosyntax and parental reports of social communication. Intercorrelations at and between T1 and T2 were high, and dissociations were rare. Ordinal regressions were run, entering predictors singly and simultaneously. With the exception of the phonological task, every early measure on its own was significantly predictive of most outcomes, and receptive language was the strongest all-round predictor. Results of simultaneous entry, controlling for the effect of other predictors, showed that early language was the strongest predictor of general language outcome, but early phonology was the strongest predictor of a measure of morphosyntax, and early sociocognition the strongest predictor of social communication. Language measures which draw on a wide range of skills were the strongest overall predictors of general language outcomes. However, our VEPS measures were stronger predictors of specific outcomes. The clinical and theoretical implications of these findings are discussed.

The Self-Rating of the Effects of Alcohol Questionnaire as a Predictor of Alcohol-Related Outcomes in 12-Year-Old Subjects

A low level of response (LR), or low sensitivity, to alcohol as established by alcohol challenges has been shown to predict future heavier drinking, alcohol-related problems and alcohol use disorders. To date, only one study has evaluated the predictive validity of a second measure of LR as determined by the Self-Report of the Effects of Alcohol (SRE) Questionnaire. The current analyses evaluate the ability of SRE scores as determined at age 12 to predict heavier drinking and alcohol-related problems 2 years later in a sample from the United Kingdom. The subjects were 156 boys (54.5%) and girls from the Avon Longitudinal Study of Parents and Children (ALSPAC) who had reported consuming one or more standard drinks by age 12 and who were followed up 2 years later. The age 12 SRE scores correlated with the number of drinks per week, maximum drinks and the number of alcohol problems both at baseline and at age 14 follow-ups. In these evaluations, a larger number of drinks required for effects on the SRE (i.e. a lower LR per drink consumed) related to heavier intake and alcohol-related difficulties. Simultaneous entry multiple regression analyses revealed that the age 12 SRE score maintained a significant relationship with age 14 higher number of drinks per week and the number of alcohol problems even when the age 12 values for alcohol intake and problems were used as covariates. The SRE scores appear to have value in predicting future heavier drinking and alcohol problems in 12-year olds that go beyond the information offered by the earlier drinking pattern alone.

An examination of nervios among Mexican seasonal farm workers

The purpose of this exploratory descriptive study was to examine a process model of the nervios experience of 30 Mexican seasonal farm workers. Focused interviews were conducted in Spanish to determine the workers' perspectives on their experiences of nervios while residing in rural, southwest Ontario. Data for analysis originated from variables created to represent key themes that had emerged from open coding of the interviews. Simultaneous entry, multiple regression analyses revealed that provocation, control salience, and cognitive sensory motor distress directly explained 67.2% of the variation in worker expressions of negative affectivity. The combination fear, feeling trapped, and giving in mediated the relationship of provocation, control salience and cognitive sensory motor distress to expressions of negative affectivity (R(2) = 88.1%). Control salience and its dampening effect on other elements of the nervios experience, however, appeared to be key to whether subjects experienced negative reactions to being provoked or distressed. This evidence points to nervios being a powerful, holistic idiom of distress with at least six variables contributing to its affective negativity. This information is important to our understanding of how nervios unfolds and for accurate specification of a nervios model for clinical practice and research. It also sets the stage for improved therapeutic alliances with nervios sufferers, and social action to reduce factors that provoke nervios.

Pore size independent regioselective cyclohexylation of ethylbenzene

Al-MCM-41 (Si/Al = 52 and 105) and Al-MCM-48 (Si/Al = 47 and 102) molecular sieves were synthesised by hydrothermal method. These materials and commercial HY zeolite were characterised by XRD, BET, 27Al MAS-NMR, pyridine adsorbed FT-IR and ICP-AES techniques. The vapour phase cyclohexylation of ethylbenzene (EB) with cyclohexene was carried out between 200 and 400 °C over all the catalysts. The major products were found to be p-cyclohexyl ethylbenzene ( p-CEB) and o-cyclohexyl ethylbenzene ( o-CEB). The activity of the catalysts followed the order Al-MCM-41 (52) > Al-MCM-41 (105) > Al-MCM-48 (47) > Al-MCM-48 (102) > HY. Al-MCM-41 and Al-MCM-48 are more active than HY although the density of acid sites of the former catalysts is less than the latter. This is due to the large pore size of Al-MCM-41 and Al-MCM-48 catalysts that permits simultaneous entry of more reactants into the pores and expulsion of products freely out of the pores. Al-MCM-41 catalysts are more active than Al-MCM-48 catalysts due to more density of acid sites on the channel surface of Al-MCM-41. The selectivity of p-CEB is higher than o-CEB due to less steric hindrance for its formation. The effects of feed ratio and WHSV on ethylbenzene conversion and product selectivities were evaluated in the above reaction.

Relations of Physical Self-Concept and Muscular Strength with Resistance Exercise-Induced Feeling State Scores in Older Women

Formerly sedentary older women (M age = 62 yr.) were recruited for either a wait-list control group (n=40) or a 10-.wk., 3 days/wk. weight-training treatment group (n=48). Only the treatment group demonstrated significant before- to after-exercise improvements on the Exercise-induced Feeling Inventory scales of Positive Engagement, Revitalization, Tranquility, and Physical Exhaustion (ds = /.43/ to /.96/). For the treatment group, scores on Physical Self-concept of the Tennessee Self-concept Scale: 2 were significantly correlated (r = -.28) with after-exercise changes in Physical Exhaustion. Muscular strength was significantly correlated with after-exercise changes in scores on three Exercise-induced Feeling Inventory scales (rs= /.28/ to /.31/). Simultaneous entry of Physical Self-concept scores and muscular strength into multiple regression equations increased the explained variance in Exercise-induced Feeling Inventory score changes for each of its four scales. Statistical significance was only reached, however, on changes in the Physical Exhaustion scale (R2 = .16, p = .02). Limitations and implications for theoretical development and applied use were discussed.

Factors in the Selection of Patients for Conditional Release From Their First Psychiatric Hospitalization

Factors in the Selection of Patients for Conditional Release From Their First Psychiatric Hospitalization

Stress-related reduction in personal mastery is associated with reduced immune cell β2-adrenergic receptor sensitivity

A growing body of literature suggests that caregiving burden is associated with impaired immune system functioning, which may contribute to elevated morbidity and mortality risk among dementia caregivers. However, potential mechanisms linking these relationships are not well understood. The purpose of this study was to investigate whether stress-related experience of depressive symptoms and reductions in personal mastery were related to alterations in ss2-adrenergic receptor sensitivity. Spousal Alzheimer's caregivers (N = 106) completed measures assessing the extent to which they felt overloaded by their caregiving responsibilities, experienced depressive symptoms, and believed their life circumstances were under their control. We hypothesized that caregivers reporting elevated stress would report increased depressive symptoms and reduced mastery, which in turn would be associated with reduced ss2- adrenergic receptor sensitivity on peripheral blood mononuclear cells (PBMC), as assessed by in vitro isoproterenol stimulation. Regression analyses indicated that overload was negatively associated with mastery (beta = -0.36, p = 0.001) and receptor sensitivity (beta = -0.24, p = 0.030), whereas mastery was positively associated with receptor sensitivity (beta = 0.29, p = 0.005). Finally, the relationship between overload and receptor sensitivity diminished upon simultaneous entry of mastery. Sobel's test confirmed that mastery significantly mediated some of the relationship between overload and receptor sensitivity (z = -2.02, p = 0.044). These results suggest that a reduced sense of mastery may help explain the association between caregiving burden and reduced immune cell ss2-receptor sensitivity.

Relations of physical self-concept and self-efficacy with frequency of voluntary physical activity in preadolescents: Implications for after-school care programming

Objective This study aimed to test relations of physical self-concept and self-efficacy with voluntary physical activity in preadolescents enrolled in an after-school physical activity program. Methods Participants in the 2003 ( n=41) and 2005 ( n=84) versions of the Youth Fit For Life protocol and the control group ( n=40) completed the Physical Self-Concept scale, the Exercise Barriers Self-Efficacy Scale for Children, and a recall of physical activity frequency at Weeks 1 and 12. Results Both treatment groups demonstrated significantly increased frequency of voluntary physical activity over 12 weeks. The 2005 version additionally demonstrated significant improvements in both physical self-concept and exercise barriers self-efficacy. Within the treatment groups, significant correlations between changes in physical self-concept and self-efficacy and physical activity sessions completed were found. Multiple regression indicated that 7% to 28% of the variance in voluntary physical activity was explained by the simultaneous entry of changes in physical self-concept and self-efficacy. Conclusion Tenets of social cognitive and self-efficacy theory were supported and suggested that curricular elements of after-school care programming may increase overall outputs of moderate-to-vigorous physical activity in preadolescents.

Correlates of Mood Changes in Obese Women Initiating a Moderate Exercise and Nutrition Information Program

This 20-wk. study assessed relationships of mean difference scores on measures of self-efficacy and self-concept with scores for overall mood in 44 obese women who initiated a moderate exercise and nutrition information program. Simultaneous entry of changes in Physical Self-concept, Exercise Self-efficacy, and Body Areas Satisfaction scale scores into a multiple regression equation explained a significant 38% of the variance in changes in Total Mood Disturbance (R2 = .38, F3,40 = 8.09, p < .001).

Descriptive Characteristics as Potential Predictors of Outcomes Following Constraint-Induced Movement Therapy for People After Stroke

Limited evidence exists regarding the characteristics of people who benefit most from constraint-induced movement therapy (CIMT). This study's purpose was to investigate 6 potential descriptors in predicting CIMT outcomes. The participants were a convenience sample (N=55) of people who were more than 6 months poststroke. The Wolf Motor Function Test (WMFT) and the Motor Activity Log amount scale (MALa) were used to assess outcomes for CIMT. The potential predictors (side of stroke, time since stroke, hand dominance, age, sex, and ambulatory status) were entered into a linear regression model using stepwise entry, with simultaneous entry of the dependent variables' pretest scores as the covariate. Age was the only significant predictor of the 6 potential predictors in the model and was predictive only of MALa scores. None of the independent variables showed a predictive relationship with the WMFT. Although age was the only significant predictor, an equally strong finding in this study was that side of stroke, chronicity, hand dominance, sex, and ambulatory status were not found to be predictors at the follow-up session. This finding emphasizes the importance of not excluding people from CIMT based on these predictors.

Firm Turnover in Imperfectly Competitive Markets1

This paper is motivated by the empirical regularity that industries differ greatly in the level of firm turnover and that entry and exit rates are positively correlated across industries. Our objective is to investigate the effect of fixed costs and, in particular. market size on entry and exit rates and hence on the age distribution of firms. We analyse a stochastic dynamic model of a monopolistically competitive industry. Each firm's efficiency is assumed to follow a Markov process. We show existence and uniqueness of a stationary equilibrium with simultaneous entry and exit: efficient firms survive, while inefficient ones leave the market and are replaced by new entrants. We perform comparative dynamics with respect to the level of fixed costs: entry costs are negatively related and fixed production costs positively related to entry and exit rates. A central empirical prediction of the model is that the level of firm turnover is increasing in market size. In larger markets, competition is endogenously more intense than in smaller markets, and so price-cost margins are smaller. This price competition effect implies that the marginal surviving firm has to be more efficient than in smaller markets. Hence, in larger markets, the expected lifespan of firms is shorter, and the age distribution of firms is first-order stochastically dominated by that in smaller markets. In the empirical part, the prediction on market size and firm turnover is tested on an industry where firms compete in well-defined geographical markets of different sizes. Using data on hair salons in Sweden, we show that an increase in market size or fixed costs shifts the a-e distribution of firms towards younger firms, as predicted by the model.

Common cavity pressure during gastroesophageal reflux: reassessment using simultaneous pressure, impedance, and ultrasound imaging

An increase in intraesophageal pressure during transient lower esophageal sphincter (LES) relaxation [referred to as common cavity (CC) pressure] is thought to be a marker of gastroesophageal reflux (GER). Multiluminal impedance (MII) measurement is a sensitive marker of reflux entry into the esophagus during GER. We recorded GER using esophageal pressure, pH, impedance, and intraluminal ultrasound (US) images to understand the genesis of the esophageal CC pressure. Nine normal subjects underwent simultaneous MII/pH/pressure and US image recording of the esophagus for 2 h following a standardized meal. MII and pressure transducers were located at 5 and 15 cm above the LES. The US transducer and pH sensors were also placed at 5 cm above the LES. Refluxate entry into the esophagus by MII criteria was determined relative to the onset of CC pressure wave. Esophageal lumen cross-sectional area (CSA) and muscle CSA during GER were determined from the US images. Eighty liquid GER episodes identified using MII criteria, of which 55 were clearly associated with CC pressure waves, were analyzed. The GER reached 15 cm above LES in 49 of 55 (89%) by MII criteria, but the CC pressure wave was observed at 5 and 15 cm during all episodes. The propagation of the CC pressure wave was simultaneous between 5 and 15 cm during 49 of 55 (89%) of the GER episodes, but reflux entry by MII criteria was retrograde during 53 of 55 (96%) of these episodes. During 5 air-reflux episodes, MII showed a simultaneous reflux entry between the 5- and 15-cm site, however, the CC pressure preceded reflux entry during all of these episodes. There was poor correlation between the luminal CSA and the magnitude of CC pressure (R(2) = 0.144). US images revealed a close temporal correlation between CC pressure and the increase in esophageal muscle thickness and muscle CSA (markers of longitudinal muscle contraction). Disassociation between CC pressure and MII-detected reflux suggests that the onset of CC pressure is not due to GER. We speculate that longitudinal muscle contraction plays an important role in the genesis of CC pressure.

New Aspects of the Electroadsorption of Ethyl Xanthate on Copper Electrodes

The interaction of the ethyl xanthate (EX) anion with a copper electrode in a borate buffer solution, pH 9.2, has been investigated by cyclic voltammetry (CV), electrochemical quartz crystal microbalance (EQCM), electrochemical impedance spectroscopy (EIS), and measurements of contact angle (CA) under controlled potential. The results obtained allow establishing that, in the potential range from -0.80 and -0.60 V, two parallel reactions were characterized. These reactions were the ethyl xanthate electroadsorption and the hydrogen evolution reaction (HER). This last reaction has not been described by previous authors. Besides, the EIS measurements show that the mechanism of the HER on copper electrodes is not affected by the presence of a ethyl xanthate species. The EQCM study shows that in the electrodesorption process the departure of each ethyl xanthate species from the copper electrode is accompanied with the simultaneous entry of four to five water molecules. This fact is in accordance with the number of copper atoms involved in the adsorption of one ethyl xanthate species.

Alterations of lymphocyte membranes during HIV‐1 infection via multiple and simultaneous entry strategies

Human immunodeficiency virus type 1 (HIV-1) must bind to and enter lymphocytes to replicate and cause the acquired immunodeficiency syndrome. The association of viral particles with the lymphocyte plasma membrane may vary according to a multitude of unknown variables, including lymphocyte membrane receptor mobilization, lipid raft aggregation, clathrin, caveolin, endosomes, microendosome-mediated penetration or penetration through a hole in the membrane. The time course of this delivery appears to be short. Fusion of the virion membrane and lymphocyte plasma membrane leads to destabilization of the lymphocyte membrane. Five morphological stages of membrane alteration were observed in the infected lymphocytes: (1) swelling, (2) splitting, (3) fusion, (4) breaking, and (5) thinning of the lipid bilayer. These plasma membrane alterations were not contributed by fixation artifacts, because the dimensions and distance between the subunits of the surface glycoprotein (SU, gp120) and the transmembrane glycoprotein (gp41) of the viral particles adjacent to the infected cells and processed at the same time remained unchanged. Destabilization of lipid raft patches in the lymphocyte plasma membrane by unknown variables may facilitate HIV-1 penetration of lymphocyte, and other cell types. This a combined review of the pertinent literature with our data showing that HIV-1 may take advantage of multiple penetration approaches simultaneously in the same cell type (H9) to overwhelm the infected cells. The ultrastructural details of H9 cultured cells infected in vitro with HIV-1 contribute to our understanding of viral particle association with the plasma membrane of infected cells.

Active Finger Extension Predicts Outcomes After Constraint-Induced Movement Therapy for Individuals With Hemiparesis After Stroke

Constraint-induced movement therapy (CIMT) is a rehabilitative strategy used primarily with the post-stroke population to increase the functional use of the neurologically weaker upper extremity through massed practice while restraining the lesser involved upper extremity. Whereas research evidence supports CIMT, limited evidence exists regarding the characteristics of individuals who benefit most from this intervention. The goal of this study was to investigate the potential of 5 measures to predict functional CIMT outcomes. A convenience sample of 55 individuals, >6 months after stroke, was recruited that met specific inclusion/exclusion criteria allowing for individuals whose upper extremity was mildly to severely involved. They participated in CIMT 6 hours per day. Pretest, post-test, and follow-up assessments were performed to assess the outcomes for the Wolf Motor Function Test (WMFT). The potential predictors were minimal motor criteria (active extension of the wrist and 3 fingers), active finger extension/grasp release, grip strength, Fugl-Meyer upper extremity motor score, and the Frenchay score. A step-wise regression analysis was used in which the potential predictors were entered in a linear regression model with simultaneous entry of the dependent variables' pretest score as the covariate. Two regressions models were determined for the dependent variable, for immediate post-test, and for follow-up post-test. Finger extension was the only significant predictor of WMFT outcomes. When using finger extension/grasp release as a predictor in the regression equations, one can predict individual's follow-up scores for CIMT. This experiment provides the most comprehensive investigation of predictors of CIMT outcomes to date.

Quantification and Prediction of Pilot Workload in the Helicopter/Ship Dynamic Interface

The evaluation, early in the design cycle, of the limits for operating aircraft from ships in a wide range of sea states and atmospheric conditions has become an important issue for two main reasons. First, the simultaneous entry into service of new helicopter types and new naval platforms has generated an enormous task in the development of appropriate Ship Helicopter Operating Limits for in-service operations. Second, it has become clear that such operational factors need to be addressed at the design stage - which of necessity involves developing a predictive capacity in all of the areas which influence operational capability. These considerations need to take place in the context of technological advances which seek to assist the pilot in operations from ships. Improved radar for ship approaches and enhanced cueing, located around hangars and landing spots, are both areas which are being continually developed in association with upgraded aircraft systems for guidance, control, and stability augmentation. Ultimately, however, the situation comes down to the pilot's assessment of the workload involved in any task and the handling qualities of the vehicle being controlled. For this reason there has been a growing interest in two related areas: (i) the development of metrics to provide a consistent indicator of pilot workload and (ii) the enhancement of existing pilot models to generate authentic control activity in the aircraft/ship dynamic interface. This article describes recent techniques for extracting workload metrics from control activity and indicates the extent to which acceptably accurate workload predictions can be made. Some advances in pilot modelling are also described and examples are given to demonstrate the capability and limitations of currently available methods. Finally, the present state of integration of the two aspects into a robust tool for ship and aircraft system design is discussed. The focus of this article is, of necessity, on helicopter operations because that is where most of the current work has been centred.