Influence of positive reinforcement of aggression on subjects differing in initial aggression level.

60 females, who were ostensibly serving as assistants in a learning study, were required to deliver electric shocks as punishments for "errors" to a confederate of E. Ss selected the intensity of the shock they delivered. During a training period experimental Ss were verbally reinforced for delivering shocks of relatively high intensity. Pretest-to-posttest increases in intensity of shock were significantly greater for experimental Ss than for control, nonreinforced, Ss. This increase was, however, confined to Ss who used an intially high or medium level of intensity; Ss initially using low initial intensities were not influenced by the reinforcement procedure. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Quantum size effect in thin films

When the thickness of a film is of the order of the de Broglie wavelength of the electron, size effects appear in the electrical properties of the material. In this paper we derive the current in the presence of a magnetic field perpendicular to the plane of the film. We use the quantum mechanical density-matrix formalism. Unlike previous works we obtain an exact expression for the current. It is found that the current has a non-linear behavior with the electric field. The current also oscillates with the thickness of the film.     

Substituted sulfonamides,ureas, and alkyl-3-nitrophthali-mides as identification derivatives of pentyl-, hexyl-, heptyl-, octyl-, and decylamines

Summary p-Bromo-,m-nitro-,p-nitrobenzenesulfonamides,p-toluenesulfonamides,p-tolyl-, anda-naphthylureas, and 3-nitrophthalimide derivatives of pentyl-, hexyl-, heptyl-, octyl-, and decylamines were prepared.m-Nitrobenzenesulfonamides,p-nitrobenzensulfonamides, andp-tolylureas appear to be the most satisfactory derivatives for the identification of these amines. Taken from senior theses submitted by Francis A. Carey and Charles M. Paulson.     

Biomass and Distribution of Cladophora Glomerata in Relation to Some Physical-Chemical Variables at Two Sites in Lake Erie

Cladophora was collected from 0.25-m² quadrats on alternate weeks at two sites located in Lake Erie near Hamburg, New York, and Walnut Creek near Erie, Pennsylvania, between June and November 1979. Cladophora biomass and internal nutrients (total Kjeldahl nitrogen and total phosphorus) were determined. Water samples were analyzed for total phosphorus, soluble reactive phosphorus, nitrate + nitrite nitrogen, total Kjeldahl nitrogen, and ammonia nitrogen. Temperature and Secchi disk transparency were also recorded.The peak standing crop for Cladophora was 211 gDW/m² (July) at the Hamburg site and 57 gDW/m² (July) at Walnut Creek. The depth distribution of Cladophora at the sample sites was influenced by wave activity and drifting sand. As a result of sand scouring at the shallower depths, Cladophora biomass generally was greatest at the 3-m depth.Reductions in Cladophora internal nutrients corresponded to decreased nutrients in the water. Cladophora detached from its substrate during periods when low internal nutrient levels were observed. Internal total phosphorus concentrations were low and approached the minimum cell quota (0.05–0.06% –P) most of the time. Soluble reactive phosphorus values were also low (1–4 μgP/L). Levels of soluble reactive phosphorus and internal total phosphorus were low and almost always limiting, and may be responsible for the low biomass values observed. In addition, internal total phosphorus levels showed a significant positive correlation with Cladophora biomass. Internal total nitrogen values were generally less than 1%-N at Walnut Creek and ammonia nitrogen measurements were near detection limits. Cladophora was nitrogen-limited at the Walnut Creek site during part of the study period. Nitrate + nitrite nitrogen showed a significant positive correlation with Cladophora biomass at that site.     

Marquis-K cultivar standard for wheat gliadin electrophoresis

Gliadins from single kernels and bulk samples (1 g) of the common wheat cultivar Marquis grown in different years and from different seed sources were separated by polyacrylamide gel electrophoresis. Gliadin electrophoregrams from inbred stocks of Marquis derived from a single-plant selection propagated over a period of 13 years were identical. Single seed analysis indicated differences in gliadin composition of Marquis obtained from different sources. It is recommended that the inbred stock referred to as Marquis-K be adopted as the standard for this cultivar.     

General instrumentation for the operant conditioning experiment.

Reviews and updates C. B. Ferster's (see 28:2) paper on the criteria and principles involved in operant conditioning experiments. "Instrumentation of the free-operant situation requires (a) a manipulandum, that is, some device that the S can manipulate and that operates a switch; (b) a recording system; (c) a reinforcement device to present and control the reinforcing stimulus; (d) a chamber or chair in which the animal can be placed; and (e) the control equipment to arrange the required contingencies between the operation of the manipulandum switch, reinforcement device, recorder, and any stimuli that might be presented." (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Geometry of grain boundaries

The first part of this paper deals with the problem of describing and measuring microstructure in exact terms. The Euclidean parameters: volume, area, length, and angle can be measured and expressed only in terms of the total of each in unit volume. Average properties, such as average grain diameter, are accessible only through the topological parameters, specifically number in unit volume, which can be measured only by serial sectioning. The parameters which have been used to represent the concept of grain size are analyzed and shown in most cases to represent a function of grain boundary area. In a second section of this paper the geometric problem of plastic slip through a grain boundary is analyzed. A method is proposed by which all of the components of the deformation, as well as the crystallographic directions, can be manipulated simultaneously through the use of a stereographic projection. The third section of this paper is concerned with the geometry of grain growth. The polycrystalline state is described as a grain boundary network, which must respond to the requirements of surface tension. The several topological changes in a network which can contribute to grain growth are described.     

Non-Parametric Sensitivity Analysis in Linear Programming

A linear programming problem subject to uncertainty in the requirements vector is solved deterministically, then sensitivity analysis is performed to determine the effect of the random variation on this solution. Since there could be an appreciable cost of modifying a solution once implemented, the probability of the random components perturbing a solution is considered. Unlike existing methods of linear programming under uncertainty, this article assumes no knowledge of the distributions of the random variables. Rather, the notion of non-parametric tolerance limits is employed to establish a criterion for changing basic solutions.