8,581 research outputs found
An Examination of Peer Influences on Identity in the Art Classroom
In this study, I examined the impacts of peer interactions on tween-aged students’ representations of themselves through self-portraits. Using social interaction theory (Turner, 1988), I implemented an action research study in the Fall of 2021. Two classes of fifth-grade students worked over four weeks to create self-portraits. I observed students\u27 interactions with peers, collected audio recordings, and completed self-portraits. For two additional weeks, I conducted interviews with students. My findings concerning the impacts of peer interaction on students’ self-portraits show that students prefer to represent themselves in a way that is positively received by peers rather than focusing on accurately depicting themselves. In addition, factors including the influence of consumerism/ social media and students’ conceptions of beauty, particularly perceptions of ideal skin color, influenced students’ self-portraits. The findings of this study offer insight into the necessity of a multicultural curriculum within the art classroom and reaffirmation of students’ cultural and familial backgrounds
The Tunneling Time of an Electron
There is a widely spread misconception regarding the physical significance of the various tunneling times currently used to describe metal-insulator-metal tunneling phenomena. Using quantum mechanics, the transition time of an electron tunneling from a state on one side of the barrier to a state on the other side can be determined. This time is the period of interaction between the
electron and the barrier, since before and after the transition, the electron is in a quantum state of one of the metals. Furthermore, the RC time constant of the sandwich-like device and the electron transition or interaction time are equivalent representations
of the same physical parameter. But none of these times is the quasiclassical "transmission time" analyzed by Hartman, which has become widely accepted as the electron-barrier interaction time, although this was clearly not his intention. In this communication we wish to point out that it is the (quantum mechanical) transition time which is the characteristic time of tunneling phenomena
A MOS cursive-character generator
Cursive characters can be made to be more readable, more
attractive, and better suited to the operation of graphic CRT terminals than the usual dot-matrix type; a system using cursive-type characters achieves much higher writing rate while requiring much less bandwidth
than that using dot-matrix-type characters. This paper presents an economical method of generating the x, y, and z analog signals for forming cursive characters with the deflection system of a CRT.
A circuit design embodying a complete 48-stroke character generator on a single MOS integrated circuit is described. The IC accepts 7-bit ASCII code and outputs x, y, and z analog signals to generate any one of 32 standard ASCII characters in 5 μs. Additional groups of 32
characters can be added by merely paralleling additional chips. The entire 32 character digital and analog function has been implemented on a single self-contained 16-pin silicon-gate MOS chip 125 X 165 mil in size. Character encoding on the chip is accomplished in one mask at
the diffusion step, and a straightforward mask-generation procedure has been developed
Video Self-reflection and Coach Development in New Zealand
Drawing on data from semi-structured interviews with New Zealand
coaches (N = 6), this study examined how video self-reflection (VSR)
was perceived as a tool for learning within ‘on-going’ coach
development. This study also looked to determine the potential
barriers experienced by coaches before engaging in VSR. Each
participant was a performance coach (as identified by the NZ
coach development framework (CDF)) with 5+ years coaching
experience and had recently (in the previous 12 months)
participated in a coach development program that aligned with
Sport NZ’s CDF. Five main themes emerged from the data;
coaches had a positive perception of the benefits of VSR, a desire
to engage in VSR but did not prioritise the time, logistical
concerns, a fear of self-confrontation and evidence of knowledge
for ‘modern’ coaching development. Findings indicated that
coaches valued VSR as a tool for learning; however, the lack of
exposure and experience in the process meant coaches did not
value the practise enough to dedicate specific time towards it.
This study provides an evidence-base that can be used to support
National Governing Bodies coach development frameworks, and
the modification of content to encourage the use of VSR as a tool
for learning
Fetal alcohol spectrum disorders and their transmission through genetic and epigenetic mechanisms
Fetal alcohol spectrum disorders (FASD) are a group of related conditions that arise from prenatal exposure to maternal consumption of the teratogen, ethanol. It has been estimated that roughly 1% of children in the US suffer from FASD (Sampson et al., 1997), though in some world populations, such as inhabitants of some poorer regions of South Africa, the rate can climb to as high as 20% (May et al., 2013). FASD are the largest cause of mental retardation in U.S. neonates, and ironically, are entirely preventable. FASD has been linked to major changes in the hypothalamic-pituitary-adrenal (HPA) axis, resulting in lifelong impairments through mental disorders, retardation, sensitivity to stress, and an impaired immune system with the related outcomes of elevated risk of cancer and other diseases. FASD arises from a complex interplay of genetic and epigenetic factors. Here, we review current literature on the topic to tease apart what is known in these areas particularly emphasizing the HPA axis dysfunction and how they tie into new studies of transgenerational inheritance in FASD
The effect of within-crop habitat manipulations on the conservation biological control of aphids in field-grown lettuce
Within-crop habitat manipulations have the potential to increase the biological
control of pests in horticultural field crops. Wildflower strips have been shown to
increase the abundance of natural enemies, but there is little evidence to date of an
impact on pest populations. The aim of this study was to determine whether withincrop
wildflower strips can increase the natural regulation of pests in horticultural
field crops. Aphid numbers in plots of lettuce grown adjacent to wildflower strips
were compared with those in plots grown in the absence of wildflowers. The presence
of wildflower strips led to a decrease in aphid numbers on adjacent lettuce plants
during June and July, but had less impact in August and September. The decrease in
aphid numbers was greatest close to the wildflower strips and, the decrease in aphid
numbers declined with increasing distance from the wildflower strips, with little
effect at a distance of ten metres. The main natural enemies found in the crop were
those that dispersed aerially, which is consistent with data from previous studies on
cereal crops. Analysis and interpretation of natural enemy numbers was difficult due
to low recovery of natural enemies, and the numbers appeared to follow changes in
aphid abundance rather than being directly linked to the presence of wildflower
strips. Cutting the wildflower strips, to remove floral resources, had no impact on the
reduction in aphid numbers achieved during June and July, but decreased the effect
of the wildflower strips during August and September. The results suggest that
wildflower strips can lead to increased natural regulation of pest aphids in outdoor
lettuce crops, but more research is required to determine how this is mediated by
natural enemies and how the impact of wildflower strips on natural pest regulation
changes during the growing season
A handbook of Nebraska grasses : with illustrated keys for their identification, together with a general account of their structure and economic importance
The true grasses belong to the one family Poaceae, often called Gramineae, and constitute a very well defined natural group of plants. This family comprises upward of 3,000 species distributed among almost 300 genera. From the economic point of view the family is of supreme importance thru the fact that here belong the cereals, which supply a large part of the food of man, and the forage grasses which are so important as feed for our domesticated animals. The genera and species are for the most part separated by artificial characters—a fact which renders their study and identification extremely difficult even for the expert. The experience of the authors has convinced them that much of this difficulty is to be credited to the keys found in our common manuals. Theoretically a key is intended to assist one in properly identifying a plant, but actually many of the keys, upon close inspection. are found to contain so many vague and contradictory statements that they can be depended upon only by the expert who, on account of his working knowledge, makes slight use of the keys. It occurred to the senior author some years ago that an illustrated key might solve many of these difficulties. An accurate illustration conveys a more definite idea of any particular structure and leaves less room for doubt than any number of words. In fact, the serious and annoying inaccuracies of most keys to the grasses became more and more apparent as the work of preparing the illustrations progressed. The authors are fully convinced that illustrated keys of the type here employed will prove useful in many other groups of plants. The nomenclature here employed is largely that of the seventh edition of Gray\u27s Manual—tho our purpose has not been to insist upon any particular name but to provide means whereby the student can with some certainty attach to any given plant some one name which has been properly authorized. The present key includes most of the species known to occur in Nebraska, tho a few of minor importance and very restricted distribution have been omitted. There are provided also some data on the economic value of certain of the most important species. The illustrations for the grass keys have been drawn expressly for this publication. They are derived in part from actual authentic specimens and in part redrawn in modified form from various manuals and monographs. T he authors have made free use of the manuals, monographs. etc., included in the Bibliography and take this opportunity to commend these publications to the attention of all who wish to learn more of our common grasses. It is hoped that the keys here presented will facilitate the study of the grass flora of Nebraska by farmers and students
Single-Chip Cursive Character Generator
A unique circuit design using conventional MOS technology
has been found to yield a sequential read-only analog
memory which can generate the x- and y-axis deflection
voltages for the stroke-by-stroke synthesis of
alphanumeric characters
Adult Kittiwake expelling chick from nesting ledge
On 17th June 2021, we witnessed an adult Kittiwake Rissa tridactyla expel a chick from its nesting ledge. The chick fell to its death. We made the observation during our annual monitoring of this species on Lundy. A scan of the colony at 12.13 hrs detected unusual movement in a two-chick nest. One chick, which we designated as the beta chick given its smaller size, was unusually positioned outside the nest away from the alpha chick and the adult, which both remained in the nest. We estimate that the beta chick was about 1–2 days old. The site was such that the floor of the ledge extended well behind the nest to a slightly overhanging back wall, and the chick was scrabbling against this back wall. At 12.25 hrs, in a rapid sequence of movements lasting only seconds, the beta chick turned and moved back in the direction of the nest. As it approached, it came between the adult and a side wall and was then grasped in the adult’s beak and expelled in an upward arc, falling into the sea below. No interactions between the alpha and beta were observed
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