The role of working memory and verbal fluency in autobiographical memory in early Alzheimer’s disease and matched controls

Retrieval of autobiographical memories (AMs) is important for “sense of self”. Previous research and theoretical accounts suggest that working memory (WM) and semantic and phonemic fluency abilities facilitate the hierarchical search for, and reliving of past, personal events in the mind’s eye. However, there remains a lack of consensus as to the nature of the relationships between these cognitive functions and the truly episodic aspects of AM. The present study therefore aimed to explore the associations between these variables in a sample with a wide range of cognitive abilities. The study incorporated a between-groups component, and a correlational component with multiple regression. Participants with Alzheimer’s disease (n = 10) and matched healthy controls (n = 10) were assessed on measures of semantic and episodic AM search and retrieval, auditory and spatial WM, and semantic and phonemic fluency. The AD group produced less episodic AM content compared to controls. Semantic fluency predicted episodic AM retrieval independent of age effects but there were no significant relationships between measures of phonemic fluency, WM and episodic AM. The results suggest that the ability to maintain hierarchical search of the semantic knowledge-base is important for truly episodic reliving, and interventions for people with AM impairment might therefore benefit from incorporating structured, individualised external memory-aids to facilitate AM search and retrieval

Energy spectra of elements with 18 or = Z or = 28 between 10 and 300 GeV/amu

The HEAO-3 Heavy Nuclei Experiment is composed of ionization chambers above and below a plastic Cerenkov counter. The energy dependence of the abundances of elements with atomic number, Z, between 18 and 28 at very high energies where they are rare and thus need the large area x time are measured. The measurements of the Danish-French HEAO-3 experiment (Englemann,, et al., 1983) are extended to higher energies, using the relativistic rise of ionization signal as a measure of energy. Source abundances for Ar and Ca were determined

Paper Session I-C - Multifunctional Air Revitalization Systems

The end goal in developing air revitalization systems is improved performance and enhanced capability to enable long-duration interplanetary life support. The evolution of current and near-term techniques is the most likely path to achieve future systems in which consumables are regenerated to effect weight and cost savings. Regenerative solid amine sorbents are now in use in the Space Shuttle Extended Duration Orbiter (EDO); currently, the solid amine performs only the carbon dioxide (CO2) removal function. Testing was conducted on solid amines to better understand the behavior during CO2 adsorption and the influences of trace contaminant gases. Tests were conducted, beginning hi 1991, using Thermogravimetric Analysis (TGA) system and on a sorbent column linked to a mass spectrometer and a gas chromatograph to ascertain the ability of the solid amine to remove CO2 and trace contaminants. Solid amine adsorption and desorption test data were obtained for trace contaminants representing corrosive and reactive compounds typical of space cabin atmospheres. Test results show that the solid amine has the ability to regeneratively remove trace contaminants, although some highly corrosive gases bond irreversibly. The TGA system proved to be a rapid, versatile method to screen trace contaminants for effects on solid amine; the column system provided more realistic conditions and analysis of off-gas products. Both analysis tools have provided initial capability to assess regenerative air revitalization techniques that may then be combined to create a multifunctional, closed-loop atmosphere purification system

Incorporating detectability of threatened species into environmental impact assessment

Environmental impact assessment (EIA) is a key mechanism for protecting threatened plant and animal species. Many species are not perfectly detectable and, even when present, may remain undetected during EIA surveys, increasing the risk of site-level loss or extinction of species. Numerous methods now exist for estimating detectability of plants and animals. Despite this, regulations concerning survey protocol and effort during EIAs fail to adequately address issues of detectability. Probability of detection is intrinsically linked to survey effort; thus, minimum survey effort requirements are a useful way to address the risks of false absences. We utilized 2 methods for determining appropriate survey effort requirements during EIA surveys. One method determined the survey effort required to achieve a probability of detection of 0.95 when the species is present. The second method estimated the survey effort required to either detect the species or reduce the probability of presence to 0.05. We applied these methods to Pimelea spinscens subsp. spinescens, a critically endangered grassland plant species in Melbourne, Australia. We detected P. spinescens in only half of the surveys undertaken at sites where it was known to exist. Estimates of the survey effort required to detect the species or demonstrate its absence with any confidence were much higher than the effort traditionally invested in EIA surveys for this species. We argue that minimum survey requirements be established for all species listed under threatened species legislation and hope that our findings will provide an impetus for collecting, compiling, and synthesizing quantitative detectability estimates for a broad range of plant and animal species

Gloria’s Story and Guatemala’s Faith: Adulterous Concubinage, Law, and Religion

John Wertheimer, the author of “Gloria’s Story,” has produced a complex and absorbing text that skillfully guides the reader through the microhistory of Gloria’s concubinage to an enhanced appreciation of the greater legal, social, and institutional forces at play in mid-twentieth century Guatemala. Using Gloria’s story to shift into more general observations about law and society in Guatemala, Wertheimer states that laws can “affect behavior by establishing incentives and disincentives for different types of action and by reinforcing or undermining different values.”1 Wertheimer reads the legal records involving Gloria and her family to write her story from the dominant critical perspective of gender and class. He notes the way in which class distinctions played into the creation and maintenance of concubinages and the manner in which gender stereotypes bolstered such institutions. It is all exacting yet comfortable stuff for us to read. “Yes, yes, of course, exactly” we nod as we read of the individual and institutional gendered oppression meted out on Gloria and her children by Julio and the state. Nonetheless, Wertheimer’s analysis delves deeper: Gloria may have gained in status and stability through her concubinage, and liberal reforms such as decriminalizing adultery and casting out distinctions between legitimate and illegitimate children may have had the unintended consequence of strengthening the institution of adulterous concubinage

Consequences of inconsistently classifying woodland birds

There is a longstanding debate regarding the need for ecology to develop consistent terminology. On one hand, consistent terminology would aid in synthesizing results between studies and ease communication of results. On the other hand, there is no proof that standardizing terminology is necessary and it could limit the scope of research in certain fields. This article is the first to provide evidence that terminology can influence results of ecological studies. We find that researchers are classifying "woodland birds" inconsistently because of their research aims and linguistic uncertainty. Importantly, we show that these inconsistencies introduce a systematic bias to results. We argue that using inconsistent terms can bias the results of studies, thereby harming the field of ecology, because scientific progress relies on the ability to synthesize information from multiple studies

Interactions of heavy nuclei, Kr, Xe and Ho, in light targets

Over the past few years, the HEAO-3 measurements of the abundances of ultra-heavy cosmic ray nuclei (Z 26) at earth have been analyzed. In order to interpret these abundances in terms of a source composition, allowance must be made for the propagation of the nuclei in the interstellar medium. Vital to any calculation of the propagation is a knowlege of the total and partial interaction cross sections for these heavy nuclei on hydrogen. Until recently, data on such reactions have been scarce. However, now that relativistic heavy ion beams are available at the LBL Bevalac, some of the cross sections of interest can be measured at energies close to those of the cosmic ray nuclei being observed. During a recent calibration at the Bevalac of an array similar to the HEAO-C3 UH-nuclei detector, targets of raphite (C), polyethylene (CH2), and aluminum were exposed to five heavy ion beams ranging in charge (Z) from 36 to 92. Total and partial charge changing cross sections for the various beam nuclei on hydrogen can be determined from the measured cross sections on C and CH2, and will be applied to the propagation problem. The cross sections on Al can be used to correct the abundances of UH cosmic rays observed in the HEAO C-3 detector for interactions in the detector itself

Nonlinear Dynamic Modeling and Controls Development for Supersonic Propulsion System Research

This paper covers the propulsion system component modeling and controls development of an integrated nonlinear dynamic simulation for an inlet and engine that can be used for an overall vehicle (APSE) model. The focus here is on developing a methodology for the propulsion model integration, which allows for controls design that prevents inlet instabilities and minimizes the thrust oscillation experienced by the vehicle. Limiting thrust oscillations will be critical to avoid exciting vehicle aeroelastic modes. Model development includes both inlet normal shock position control and engine rotor speed control for a potential supersonic commercial transport. A loop shaping control design process is used that has previously been developed for the engine and verified on linear models, while a simpler approach is used for the inlet control design. Verification of the modeling approach is conducted by simulating a two-dimensional bifurcated inlet and a representative J-85 jet engine previously used in a NASA supersonics project. Preliminary results are presented for the current supersonics project concept variable cycle turbofan engine design