Some aspects of therapy on a girl's psychiatric ward

Thesis (M.S.)--Boston University, 195

Nature\u27s Use: Language and its Use in the Writings of John Muir and Gifford Pinchot

This paper looks at the roles that language had in the writings of John Muir, the father of American national parks and Gifford Pinchot, the father of American forest conservation. By looking at their views and uses of language we can gain a better understanding of the environmental movement both during their lifetimes and as it stands today

Patterns of substance use initiation among Indigenous adolescents

Background—The data for this study come from an eight-wave panel study of Indigenous (Canadian First Nations and American Indian) adolescents from three U.S. reservations and four Canadian reserves. Objectives—Our objective was to investigate variations in patterns of substance use initiation from early adolescence through early adulthood using data collected annually for 8 years. Method—At baseline the sample included 675 Indigenous adolescents (M age = 11.10, SD = .83; 50.3% girls). First, we calculated cumulative rates of substance use initiation by age. We then examined whether the cumulative initiation rates were moderated by gender using logistic regression analyses. Second, we calculated hazard rates for substance use initiation by age. Third, we focused on the ordering of two substances, paired two substances, and three substance initiation sequences. Results—If one looks only at the cumulative rates of substance use initiation there appears to be support for a sequential progression of substance use during early adolescence. In contrast to the cumulative rates of substance use initiation, the hazard analyses showed a much more mixed, less progressive sequence. Among two substance pairings a nicotine to marijuana initiation sequence was most likely, followed by a nicotine to alcohol sequence. An alcohol to marijuana sequence was nearly twice as likely as a marijuana to alcohol sequence. Refined analyses to conform to those of many of the traditional gateway studies by introducing paired two substance orderings indicated that nicotine and/or alcohol prior to marijuana use was by far the most likely sequence. In two of the three most likely three substance sequences (nicotine to alcohol to marijuana and nicotine to marijuana to alcohol) nicotine was the first substance initiated. Conclusion—This study refines the gateway hypothesis for Indigenous adolescents by providing an in-depth analysis of substance use initiation. The only evidence for a “gateway” substance that emerged in our analyses was for nicotine use which was likely to precede alcohol and marijuana use in both two-substance pairings and to a lesser extent in three-substance initiation sequences

AXAF SIM focus mechanism study

The design requirements and initial design concept for the AXAF-I Science Instrument Module (SIM) were reviewed at Ball on September 29, 1993. The concept design SIM focus mechanism utilizes a planetary gearset, with redundant motors, to drive a large ring (called 'main housing bearing') via a spur gearset. This large drive ring actuates three tangent bar links (called 'push rods'), which in turn actuate three levers (called 'pin levers'). Each of the three pin levers rotates an 'eccentric pin,' which in turn moves the base of a bipod flexure in both the radial (normal to optical axis) and axial (focus along optical axis) directions. Three bipod flexures are employed, equally spaced at 120 degrees apart, the base of each being translated in the two directions as described above. A focus adjustment is made by rotating the drive ring, which drives the push rods and therefore the pin levers, which in turn rotate the eccentric pins, finally imparting the two motions to the base of each of the bipod flexures. The axial translation (focus adjustment) of the focused structure is the sum of the direct axial motion plus axial motion which comes from uniformly squeezing the three bipod bases radially inward. SAO documented the following concerns regarding the focus mechanism in memo WAP-FY94-001, dated October 7, 1993: (1) The focus adjustment depends, in large part, on the structural properties (stiffnesses and end fixities) of the bipod flexures, push rods, pin levers and eccentric pins. If these properties are not matched very well, then lateral translations as well as unwanted rotations of the focussed structure will accompany focus motion. In addition, the stackup of linkage tolerances and any nonuniform wear in the linkages will result in the same unwanted motions. Thermal gradients will also affect these motions. At the review Ball did not present supporting analyses to support their choice of this design concept. (2) The proposed 'primary' method of measuring focus is by counting motor steps. The 'backup' method is by a pot mounted on the drive ring. Neither method provides for a direct measurement of the quantity desired (focus position). This is of concern because of the long and indirect relationship between focus and the sensed quantity (drive ring rotation). There are three sinusoidal relationships and structural stiffness in the path, and the resulting calibration is likely to be highly nonlinear. These methods would require an accurate ground calibration. (3) Ground calibration (and verification) of focus vs. drive position must be done in 1-g on the ground. This calibration will be complicated by both the structural characteristics of the bipods and the fact that the CG of the translating portion of the SIM is not on the optical axis (thereby causing unwated rotations and changing the focus position vs. motor step and pot readout relationships). The SIM translating weight could be offloaded, but the calibration then becomes sensitive to any errors in offloading (both magnitude and direction). There are concerns as to whether a calibration to the required accuracy can be accomplished on the ground. (4) The choice of a potentiometer as the focus position sensor is questionable in terms of reliability for a five year mission. The results of SAO's study of items 1, 2 and 3 described above are presented in this report

The Historical Loss Scale: Longitudinal Measurement Equivalence and Prospective Links to Anxiety Among North American Indigenous Adolescents

Objectives—Thoughts of historical loss (i.e., the loss of culture, land, and people as a result of colonization) are conceptualized as a contributor to the contemporary distress experienced by North American Indigenous populations. Although discussions of historical loss and related constructs (e.g., historical trauma) are widespread within the Indigenous literature, empirical efforts to understand the consequence of historical loss are limited, partially because of the lack of valid assessments. In this study we evaluated the longitudinal measurement properties of the Historical Loss Scale (HLS)—a standardized measure that was developed to systematically examine the frequency with which Indigenous individuals think about historical loss—among a sample of North American Indigenous adolescents. We also test the hypothesis that thoughts of historical loss can be psychologically distressing. Methods—Via face-to-face interviews, 636 Indigenous adolescents from a single cultural group completed the HLS and a measure of anxiety at 4 time-points, which were separated by 1- to 2-year intervals (M age = 12.09 years, SD = .86, 50.0% girls at baseline). Results—Responses to the HLS were explained well by 3-factor (i.e., cultural loss, loss of people, and cultural mistreatment) and second-order factor structures. Both of these factor structures held full longitudinal metric (i.e., factor loadings) and scalar (i.e., intercepts) equivalence. In addition, using the second-order factor structure, more frequent thoughts of historical loss were associated with increased anxiety. Conclusions—The identified 3-factor and second-order HLS structures held full longitudinal measurement equivalence. Moreover, as predicted, our results suggest that historical loss can be psychologically distressing for Indigenous adolescents

Interactive Effects within the Prototype Willingness Model: Predicting the Drinking Behavior of Indigenous Early Adolescents

Drawing on the Prototype/Willingness Model of Adolescent Risk Behavior we used longitudinal data collected from North American Indigenous early adolescents (ages 10–12 years) to examine the interactive effects of favorable drinker prototypes, perceived drinking norms, and past year drinking behavior on subsequent drinking behavior (i.e., drinking behavior 1 year later and growth in drinking behavior from 1–5 years later). We found that the positive association between favorable drinker prototypes and drinking one year later was strongest for adolescents who were high in past year drinking and perceived low drinking norms. The interaction pattern for growth in drinking was more complex and suggested an important pattern; specifically, favorable drinker prototypes were positively associated with drinking five years later, but only for adolescents who reported no past year drinking and perceived low drinking norms. The theoretical and practical implications of these results are discussed

A Cautionary Tale: Examining the Interplay of Culturally Specific Risk and Resilience Factors in Indigenous Communities

Efforts to build empirical evidence for the protective effects of Indigenous cultural factors on psychological health have yielded mixed findings. We examine the interplay of previously hypothesized culturally relevant risk (discrimination, historical loss) and protective (spiritual activities) factors among Indigenous people. The sample includes 569 Indigenous adolescents (mean age = 17.23, SD = 0.88; 51.0% girls) and 563 Indigenous adult caregivers (mean age = 44.66, SD = 9.18; 77.4% women). Our central finding was that indigenous spirituality was associated with poorer psychological outcomes across several domains (depressive symptoms, anger, anxiety, somatization, and interpersonal difficulties), but observed effects were attenuated once perceived discrimination and historical losses were added to statistical models. Thus, consideration of relevant stressors drastically changed our conclusions, underscoring the uncertain dynamics through which specific Indigenous cultural factors impact mental health. Researchers should work in collaboration with Indigenous communities to improve measurement and empirical investigation of these complex constructs

A Cautionary Tale: Examining the Interplay of Culturally Specific Risk and Resilience Factors in Indigenous Communities

Efforts to build empirical evidence for the protective effects of Indigenous cultural factors on psychological health have yielded mixed findings. We examine the interplay of previously hypothesized culturally relevant risk (discrimination, historical loss) and protective (spiritual activities) factors among Indigenous people. The sample includes 569 Indigenous adolescents (mean age = 17.23, SD = 0.88; 51.0% girls) and 563 Indigenous adult caregivers (mean age = 44.66, SD = 9.18; 77.4% women). Our central finding was that indigenous spirituality was associated with poorer psychological outcomes across several domains (depressive symptoms, anger, anxiety, somatization, and interpersonal difficulties), but observed effects were attenuated once perceived discrimination and historical losses were added to statistical models. Thus, consideration of relevant stressors drastically changed our conclusions, underscoring the uncertain dynamics through which specific Indigenous cultural factors impact mental health. Researchers should work in collaboration with Indigenous communities to improve measurement and empirical investigation of these complex constructs

Interactive Effects within the Prototype Willingness Model: Predicting the Drinking Behavior of Indigenous Early Adolescents

Drawing on the Prototype/Willingness Model of Adolescent Risk Behavior we used longitudinal data collected from North American Indigenous early adolescents (ages 10–12 years) to examine the interactive effects of favorable drinker prototypes, perceived drinking norms, and past year drinking behavior on subsequent drinking behavior (i.e., drinking behavior 1 year later and growth in drinking behavior from 1–5 years later). We found that the positive association between favorable drinker prototypes and drinking one year later was strongest for adolescents who were high in past year drinking and perceived low drinking norms. The interaction pattern for growth in drinking was more complex and suggested an important pattern; specifically, favorable drinker prototypes were positively associated with drinking five years later, but only for adolescents who reported no past year drinking and perceived low drinking norms. The theoretical and practical implications of these results are discussed

Predicting the Onset of Alcohol Use and the Development of Alcohol Use Disorder Among Indigenous Adolescents

Empirical efforts to identify the predictors of drinking behavior among North American Indigenous adolescents are relatively limited. Using longitudinal data, this study considers perceived discrimination, positive drinker prototypes, and peer drinking behavior as risk factors for the onset of alcohol use and development of an alcohol use disorder among 674 Indigenous adolescents as they progressed from early to late adolescence (M age at baseline = 11.11, SD = 0.83). Results showed that positive drinker prototypes and associations with peers who drink increased the risk for the onset of drinking, while perceived discrimination and associations with peers who drink increased the risk for the development of an alcohol use disorder. The theoretical and practical implications of our results are discussed