Collision phenomena in a quantum gas

The study of atomic hydrogen gas. stabilized agalnst the formation of H2 molecules by the parallel direction of the electron- and proton-spins ([formula] of [formula]). has attracted much attention in recent years" This thesis deals with the theoretical aspects of scme interesting quanturnmechanical collision phenomena appearing in such a spin-polarized gas at densitiees and ternperatures for which degeneracy effects do not playa role

Leadership in the locker room: How the intensity of leaders' unpleasant affective displays shapes team performance.

Research has documented conflicting evidence about the relationship between a leader's unpleasant affective displays and team performance. Drawing on the dual threshold model of anger, we propose a novel explanation for this paradox such that the positive relationship between leaders' unpleasant affect and team performance turns negative at high levels of intensity. We examined our hypothesis in a multilevel field study of 304 halftime locker room speeches involving 23 high school and college basketball teams and a follow-up experiment. Our results show support for the prediction and suggest that the curvilinear effect of leaders' unpleasant affective displays may be explained by team members' redirection of attention and approach, which is positively associated with team members' effort at moderate levels of leader unpleasantness but leads to lower effort at high and low levels of leader unpleasantness. We discuss the theoretical contributions for scholarship on leadership, emotions as social information theory, and practical implications of the results. (PsycINFO Database Record (c) 2019 APA, all rights reserved)

Studies of High Level Copper Supplementation to Rations for Growing-Finishing Swine

Scientists are continually searching for new compounds, as well as optimum levels and combinations of existing compounds, in order to improve gain and feed efficiency of pigs fed common swine rations without adversely affecting the quality of the pork produced. Feed efficiency is of particular importance to a profitable swine enterprise since feed costs make up approximately 65% of total production costs. During the last two decades there has been considerable interest in the ability of copper to increase gains and feed efficiency when fed at high levels in swine rations. Several reports have indicated that copper is an effective growth stimulant when added to swine rations at a level of approximately 250 ppm. The mode of action of copper and the response from copper appear to be similar to that obtained from using an antibiotic. With increased concern of public health officials and the Food and Drug Administration there is the possibility of limiting the tolerance of antibiotics in tissues of meat animals or of antibiotics being prohibited in swine feeds in the future. A nutrient which would have a similar beneficial effect in improving swine production would be of great benefit to producers. However, the widespread usage of copper as a feed additive has been restricted by reports of toxicity at levels generally recommended for improving rate of gain and feed efficiency. It is possible that high levels of copper could create an imbalance of minerals within the animal and thus impair normal body function. The objectives of this research were (1) to study the effects of copper when fed at levels of 250 or 500 ppm on growth, feed efficiency, carcass characteristics and other selected physiological parameters, and (2) to study the effects of added zinc and iron, and molybdenum in counteracting any toxic effects of copper

Flame cooling by a burner wall

A model is proposed to describe the structure of the cooling boundary layer between a cold burner wall and a flame near flash-back. Two-dimensional combustion equations are solved using a one-step chemical reaction model. The analytical solutions prove to be in good agreement with the results of a numerical study. Furthermore, the thickness of the cooling layer is estimated and appears to be in fair agreement with available experimental data. The understanding of the mass and heat transport processes in a flame near a cold burner wall is indispensable for the understanding of the flame stabilization process

The Netherlands: the overlooked variety of big business

This chapter presents an introductory and exploratory overview of the history and present state of business groups in the Netherlands, with an emphasis on large business in the twentieth century. Statistical data and overviews are complemented by case studies, in order to sketch the diversity in business groups among Dutch businesses. Although business groups were present throughout modern Dutch business history, they were never the dominant organizational form. Although some large multinationals can be classified as business groups and many smaller family businesses are business groups, little attention has been paid to the organizational form in the literature. The chapter cannot document general motivations for Dutch firms to opt for a business group structure but presents several case-specific and idiosyncratic reasons

Calcium and Phosphorus Levels in Rations for Growing-Finishing Swine

Calcium and phosphorus have long been recognized as mineral elements that are seriously deficient in cereal grains and plant by-products. However, some questions arise as to the availability of these minerals, particularly phosphorus, in cereal grains and by-products and the requirements of swine for these minerals. Evidence of lameness of growing-finishing swine is often associated with a calcium or phosphorus problem in the ration although these minerals may or may not be a factor related to this condition. This experiment was conducted to study the effects of com-soybean meal rations containing varying levels of added calcium and phosphorus on growth performance, carcass characteristics and levels of calcium and phosphorus in the blood serum of growing-finishing swine