No description available.

No description available.

No description available.

No description available.

The purpose of this study was to investigate the relationship between intelligence and self-concept of children with low levels of mental maturity. In order to get a clearer picture of this relationship, the self-concept of children at various levels of mental deficiency was investigated.

Using postulations formulated by Harlow, very few investigators have experimented with discriminative learning in relation to various levels of human mental abilities to the pattern of forming a set. The present study was designed to investigate the effects of different levels of mental abilities on the formation of these sets, using mental retardates, and analyzing the formation of these sets and the abilities of these retardates to shift dimension of cues by reversing the response conditions.

ABSTRACT Looking up at the sky, we would never guess that our atmosphere contains between one and three billion tons of dust and other particles at any given time.1 Wind assists in keeping this dust airborne, but gravity wins most of the time, forcing the dust particles earthward, proving the old adage: “what goes up, must come down.” Precipitant dust levels in the Western Cape do not follow the same pattern as the precipitant dust levels in the summer rainfall areas of South Africa. Due to the very dry summer conditions in the Western Cape, the precipitant dust levels can be very high, especially if sources of fugitive dust are ignored. An environmental consulting company positioned precipitant dust monitoring units at strategic locations, taking process and open dust sources into account. Both wet and dry depositions have been reported on in this report as one figure. Seasonal changes in, and long-term trends of, the amount of precipitant dust were documented and statistically analysed to determine if the precipitantdust levels were above the South African legislated action levels. The particle size analysis performed on the precipitant dust indicated that the dust was predominantly less than 100_μm and that about 22 percent of the particles by volume were under 15_μm. No significant decline in the precipitant dust levels around the calcining industry was noted. Recommendations are that they increase the dust control measures on site, especially near to the DHF sampling location. There was a significant decrease in the precipitant dust levels to the north and south of the smelting industry from October 2001 to April 2005, p-value 0.005 and 0.048. The recommendations for the smelting industry are that they continue to eliminate fugitive dust sources and that they continue to maintain a high awareness of dust control.

Annie Tak-ming So. / Thesis (M.Ed.)--Chinese University of Hong Kong, 1975. / Bibliography: leaves 46-47.

Thesis (M.S.M.) PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / Although testosterone therapy consistently increases hematocrit levels across numerous clinical trials, the factors that affect the relationship between testosterone therapy and on-treatment hematocrit are poorly understood. Here, the effect of testosterone on hematocrit levels was contrasted across subgroups of men from 2 randomized, placebo-controlled trials involving testosterone gel therapy: the Testosterone and Erectile Dysfunction (TED; ClinicalTrials.gov # NCT00512707; n = 130) and the Testosterone in Older Men (TOM; ClinicalTrials.gov # NCT00240981; n = 152). Hematocrit elevations with testosterone therapy were greater among men self-identifying as white (difference between white and black men 2.32, 95% CI 1.03, 3.61; P = 0.0005). Compliance to therapy also modified the effect of testosterone on hematocrit (difference between participants with 99 to 100% vs. 21 to 87% compliance with therapy 1.83%; 95% CI 0.23, 3.42; P = 0.026). On-treatment hematocrit levels were greater among older men (difference between 75 to 87 and 50 to 57 years 1.66%; 95% CI 0.08, 3.24; P = 0.039) and men with hypertension (difference between men with and without hypertension 1.31; 95% CI 0.14, 2.48; P = 0.028). On-treatment hematocrit levels were smaller among men who smoke(treatment effect difference between smokers and non-smokers -1.22%; 95% CI -2.80, 0.36; P = 0.129), men with Chronic Obstructive Pulmonary Disorder (difference - 2.92%; 95% CI -6.41, 0.58; P = 0.101), and those with sleep apnea (difference - 0.88; 95% CI -2.93, 1.16; P = 0.40), however the numbers of men reporting these characteristics are too small to draw strong conclusions. In conclusion, greater increases in hematocrit levels with testosterone therapy may associate with greater compliance, having hypertension, advanced age, and white race. / 2031-01-01

In this dissertation, I present optical emission and light scattering studies on ultraclean two-dimensional electron systems. These studies focus on emerg- ing phases in the second Landau level. I report for the excitation spectrum for fractional quantum Hall states at filling factors ν = 2+1/3, ν = 2+3/8, and ν = 2+2/5 through resonant inelastic light scattering. Resonant Rayleigh scattering is used to demonstrate that these fractional quantum Hall states are anisotropic. This work provides new insights into the nature of quasiparticle interactions of these states. It also sets the stage for the subsequent discussions about competing and coexistent phases. I present studies of emergent phases in the filling factor range 2 ≤ ν ≤ 3 using weak optical emission from the second Landau level and resonant inelas- tic light scattering by spin wave excitations. A multiplet of optical emission peaks observed that exhibit striking filling factor dependence amnifest phase competition in the second Landau level. A correlation of emission peaks in the multiplet with anomalies observed in the spin wave spectrum uncover major impact of the spin degree of freedom on the emergent phases in the second Landau level. These experiments demonstrate the promise of optical emission from excited Landau levels as a probe of emergent phases. Results from optical emission and resonant inelastic light scattering stud- ies of the second Landau level conducted at higher temperatures (T ≈ 1 K) are also presented. Evidence that many phases observed at these higher temperatures are shown to be the same as those at lower (T ≈ 40 mK) temperatures. Striking and anomalous temperature-dependence of optical emission experiments is used to gain further insight into the nature of these competing phases.