Apollo communications system support. Improvements in contact printing and metal masking techniques Final report, 1 Aug. 1967 - 29 Mar. 1968

Production methods for contact prints in emulsions or chromium coated glass plat

A crossed beam study of the reaction N/plus/ plus O2 yields NO/plus/ plus O

Studying reaction N/plus/ plus O2 yields NO/plus/ plus O as function of collision energy using crossed beam

Now, near Iowa State- The National Animal Disease Laboratory

Just completed this year in the National Animal Disease Laboratory at Ames. It\u27s the newest and most modern of three major research centers of USDA\u27s Agricultural Research Service for protecting and improving animal health

For Your Interest

These sections present brief reports on the progress, results and applications of farm and home research currently being conducted by your agricultural and home economics experiment station at Iowa State University

Assessing time knowledge in children aged 10 to 11 years

The acquisition of time knowledge involves learning how to read clocks, estimate time, read dates and learn about temporal sequences. Evidence suggests that many of these competencies are acquired by 10 years of age although not all children may follow this developmental path. The main purpose of this study was to collect normative data for a screening tool that assesses time knowledge. These data identify the prevalence and pattern of difficulties with time knowledge among a UK sample of Year 6 pupils (aged 10 to 11 years). The Time Screening Assessment tool (Doran, Dutt & Pembery, 2015), designed to assess time knowledge, was administered individually to a sample of 79 children. Findings revealed a median overall score of 32 out of a maximum score of 36. 25% of children performed at or close to ceiling, however seven children scored more than -1.5 standard deviations below the mean. The value of these findings to practitioners working with children in schools is discussed

New spaces of food justice

‘Food is fundamental to life’ (Sbicca 2012, 456) and this shared need establishes food as a site of potential for connective and convivial practices and relations. Yet, when we realise that more than one billion people are undernourished worldwide (Food Ethics Council 2010), despite the fact that the world produces enough food to feed billions more than the current global population of seven billion (Holt-Gimenez et al. 2012), the social, political, economic and environmental challenges posed by contemporary food systems start to become apparent. Given current global production levels – whether we agree with the social and environmental implications of these or not – it is clear that malnutrition rates worldwide are not simply an indicator of agricultural praxis but demonstrate the continued, broader social and structural issues of access, equity and justice. Recognising that many feel increasingly disenfranchised from formal political representation, marginalised by a hegemonic neoliberal capitalism or disconnected from ‘healthy’ social or environmental relations, food offers an opportunity to re-engage individuals and society with critical questions and practices of justice because, as Allen (2008, 159) notes, ‘no other public issue is as accessible to people in their daily lives as that of food justice. Everyone – regardless of age, gender, ethnicity, or social class – eats. We are all involved and we are all implicated’. The multiplicity of ways in which we can engage with food – including growing, buying, eating, cooking, writing, processing, marketing, selling and watching – enacts its radical potential as a set of dynamic socio-material relations (Alkon 2013; Alkon et al. 2013) that can both conform to and subvert existing practices and understandings, enabling food to ‘speak’ to many different people in a range of different contexts. Although this multiplicity has its dangers (Heynen, Kurtz, and Trauger 2012), it also means that food matters and matters in complex and diverse ways: ‘It rallies people and it often induces unexpected changes in society’ (Van der Ploeg 2013, 999)

Observation of Pure Spin Transport in a Diamond Spin Wire

Spin transport electronics - spintronics - focuses on utilizing electron spin as a state variable for quantum and classical information processing and storage. Some insulating materials, such as diamond, offer defect centers whose associated spins are well-isolated from their environment giving them long coherence times; however, spin interactions are important for transport, entanglement, and read-out. Here, we report direct measurement of pure spin transport - free of any charge motion - within a nanoscale quasi 1D 'spin wire', and find a spin diffusion length ~ 700 nm. We exploit the statistical fluctuations of a small number of spins ($\sqrt{N}$ < 100 net spins) which are in thermal equilibrium and have no imposed polarization gradient. The spin transport proceeds by means of magnetic dipole interactions that induce flip-flop transitions, a mechanism that can enable highly efficient, even reversible, pure spin currents. To further study the dynamics within the spin wire, we implement a magnetic resonance protocol that improves spatial resolution and provides nanoscale spectroscopic information which confirms the observed spin transport. This spectroscopic tool opens a potential route for spatially encoding spin information in long-lived nuclear spin states. Our measurements probe intrinsic spin dynamics at the nanometre scale, providing detailed insight needed for practical devices which seek to control spin.Comment: 7 pages, 2 figures, under consideration at Nature Nanotechnolog

Thermal emission spectroscopy of the middle atmosphere

The general objective of this research is to obtain, via remote sensing, simultaneous measurements of the vertical distributions of stratospheric temperature, ozone, and trace constituents that participate in the catalytic destruction of ozone (NO(sub y): NO, NO2, NO3, HNO3, ClONO2, N2O5, HNO4; Cl(sub x): HOCl), and the source gases for the catalytic cycles (H2O, CH4, N2O, CF2Cl2, CFCl3, CCl4, CH3Cl, CHF2Cl, etc.). Data are collected during a complete diurnal cycle in order to test our present understanding of ozone chemistry and its associate catalytic cycles. The instrumentation employed is an emission-mode, balloon-borne, liquid-nitrogen-cooled Michelson interferometer-spectrometer (SIRIS), covering the mid-infrared range with a spectral resolution of 0.020 cm(exp -1). Cryogenic cooling combined with the use of extrinsic silicon photoconductor detectors allows the detection of weak emission features of stratospheric gaseous species. Vertical distributions of these species are inferred from scans of the thermal emission of the limb in a sequence of elevation angles. The fourth SIRIS balloon flight was carried out from Palestine, Texas on September 15-16, 1986 with 9 hours of nighttime data (40 km). High quality data with spectral resolution 0.022 cm(exp -1), were obtained for numerous limb sequences. Fifteen stratospheric species have been identified to date from this flight: five species from the NO(sub y) family (HNO3, NO2, NO, ClONO2, N2O5), plus CO2, O3, H2O, N2O, CH4, CCl3F, CCl2F2, CHF2Cl, CF4, and CCl4. The nighttime values of N2O5, ClONO2, and total odd nitrogen have been measured for the first time, and compared to model results. Analysis of the diurnal variation of N2O5 within the 1984 and 1986 data sets, and of the 1984 ClONO2 measurements, were presented in the literature. The demonstrated ability of SIRIS to measure all the major NO(sub y) species, and therefore to determine the partitioning of the nitrogen family over a continuous diurnal cycle, is a powerful tool in the verification and improvement of photochemical modeling