Stitching of near-nulled subaperture measurements

A metrology system for measuring aspheric test objects by subaperture stitching. A wavefront-measuring gauge having a limited capture range of wavefront shapes collects partially overlapping subaperture measurements over the test object. A variable optical aberrator reshapes the measurement wavefront with between a limited number of the measurements to maintain the measurement wavefront within the capture range of the wavefront-measuring gauge. Various error compensators are incorporated into a stitching operation to manage residual errors associated with the use of the variable optical aberrator

Antecedents of Attachment Disorganization across the First Year: Interactions among Child and Parent Variables

Disorganized attachmentis seen as reflecting an infant’s lack of strategyfor coping with the stress of the Strange Situation procedure (SSP; Ainsworth et al., 1978) The identification of disorganized attachment by Main and Solomon (1986) generated a large body of research into its antecedents and consequences. Despite these advances, however, 1)few studies have employed a prospective longitudinal designto clarify antecedents of disorganization, and 2)most research has focused on predicting disorganization from single risk factors, rarely investigating possible interactions among child and parent or environmental variables. The current study investigated the development of disorganized attachment across the first year from a prospective longitudinal perspectivefrom 3 –13 months. A primary goal was to employ a transactional modelto predict disorganization at the end of the first year, with a focus on interactions among a variety of child (gender, stressful child characteristics) and parent variables (parenting stress, maternal behaviour, child care)

Behavioural and Affective Precursors to Disorganized Attachment in the Still-face Procedure at 4-months

We explored whether disorganization in the SSP at 13-months could be predicted from infant affect and behaviour in the SFP at 4- months. We hypothesized that infants in disorganized relationships would have the most difficulty regulating their affect and behaviour in the SFP. Infants in disorganized relationships were expected to display greater negativity (e.g., crying, negative vocalizations, stress indicators such as spitting up) throughout the SFP, compared to those in organized relationships

Measurement Via Optical Near-Nulling and Subaperture Stitching

A subaperture stitching interferometer system provides near-nulling of a subaperture wavefront reflected from an object of interest over a portion of a surface of the object. A variable optical element located in the radiation path adjustably provides near-nulling to facilitate stitching of subaperture interferograms, creating an interferogram representative of the entire surface of interest. This enables testing of aspheric surfaces without null optics customized for each surface prescription. The surface shapes of objects such as lenses and other precision components are often measured with interferometry. However, interferometers have a limited capture range, and thus the test wavefront cannot be too different from the reference or the interference cannot be analyzed. Furthermore, the performance of the interferometer is usually best when the test and reference wavefronts are nearly identical (referred to as a null condition). Thus, it is necessary when performing such measurements to correct for known variations in shape to ensure that unintended variations are within the capture range of the interferometer and accurately measured. This invention is a system for nearnulling within a subaperture stitching interferometer, although in principle, the concept can be employed by wavefront measuring gauges other than interferometers. The system employs a light source for providing coherent radiation of a subaperture extent. An object of interest is placed to modify the radiation (e.g., to reflect or pass the radiation), and a variable optical element is located to interact with, and nearly null, the affected radiation. A detector or imaging device is situated to obtain interference patterns in the modified radiation. Multiple subaperture interferograms are taken and are stitched, or joined, to provide an interferogram representative of the entire surface of the object of interest. The primary aspect of the invention is the use of adjustable corrective optics in the context of subaperture stitching near-nulling interferometry, wherein a complex surface is analyzed via multiple, separate, overlapping interferograms. For complex surfaces, the problem of managing the identification and placement of corrective optics becomes even more pronounced, to the extent that in most cases the null corrector optics are specific to the particular asphere prescription and no others (i.e. another asphere requires completely different null correction optics). In principle, the near-nulling technique does not require subaperture stitching at all. Building a near-null system that is practically useful relies on two key features: simplicity and universality. If the system is too complex, it will be difficult to calibrate and model its manufacturing errors, rendering it useless as a precision metrology tool and/or prohibitively expensive. If the system is not applicable to a wide range of test parts, then it does not provide significant value over conventional null-correction technology. Subaperture stitching enables simpler and more universal near-null systems to be effective, because a fraction of a surface is necessarily less complex than the whole surface (excepting the extreme case of a fractal surface description). The technique of near-nulling can significantly enhance aspheric subaperture stitching capability by allowing the interferometer to capture a wider range of aspheres. More over, subaperture stitching is essential to a truly effective near-nulling system, since looking at a fraction of the surface keeps the wavefront complexity within the capability of a relatively simple nearnull apparatus. Furthermore, by reducing the subaperture size, the complexity of the measured wavefront can be reduced until it is within the capability of the near-null design

Centering Work: Integration and Diffusion of Workforce Development within the U.S. Manufacturing Extension Network

As the U.S. economy rebounds from the COVID-19 pandemic, strategies that promote long-term transformation toward high-quality jobs will be critical. This includes workplace-improving interventions that enable employers to upgrade existing jobs, often while enhancing their own competitive position. This paper focuses on the Manufacturing Extension Partnership, a national network of federally funded centers that support small and medium-sized manufacturing firms. We document the range of workforce- and workplace-enhancing strategies that MEP centers have adopted since the network’s inception in the mid-1990s. While workforce development is unevenly implemented across today’s MEP network, leading centers within the network are devising transformative strategies that shape underlying business practices in ways that can improve the quality of front-line manufacturing jobs. The pandemic recovery, along with federal commitment to reenergize domestic supply chains, presents an opportunity to establish NIST-MEP as a national workforce-development leader while also strengthening localized institutional partnerships to center that effort on inclusive economic development and recovery

Both Maternal Sensitivity and Atypical Maternal Behavior Independently Predict Attachment Security and Disorganization in Adolescent Mother–infant Dyads

On the basis of these findings, at odds with current models of the origins of secure vs disorganized attachment, the current study examined the association between distinct qualities of maternal interaction and attachment in a single study. The participants in the current study were adolescent mothers and their infants, a population that has been shown to be at substantial developmental risk and to exhibit a range of markedly atypical interactions with their infants (Jaffee, Caspi, Moffitt, Belsky, and Silva, 2001)