Multiple liquid impact of single-crystal lithium fluoride

Lithium fluoride in its single-crystal form is an interesting material for investigating the development of fracture by multiple liquid impact owing to its well characterized crystal structure. The development of fracture during liquid impact is attributed to the extension of short circumferential cracks produced around the loaded area by the passing Rayleigh stress wave after the impact event. The damage threshold of single-crystal lithium fluoride is developed using the Cavendish Laboratory's multiple impact jet apparatus as a result of identifying the characteristic fracture annulus associated with liquid impact during a controlled experimental procedure. The observation of damage produced in solids by liquid impact has practical significance in the problems with supersonic aircraft flying through rain and in the erosion of turbine blades moving at high speeds through wet steam.     

Nonaddictive instrumental drug use: Theoretical strengths and weaknesses

The potential to instrumentalize drug use based upon the detection of very many different drug states undoubtedly exists, and such states may play a role in psychiatric and many other drug uses. Nevertheless, nonaddictive drug use is potentially more parsimoniously explained in terms of sensation seeking/impulsivity and drug expectations. Cultural factors also play a major role in nonaddictive drug use.     

Training children to approach or avoid novel animals: Effects on self-reported attitudes and fear beliefs and information-seeking behaviors

We examined the effects of training to approach or avoid novel animals on fear-related responses in children. Ninety-nine primary school children (9–12 years old) were instructed to repeatedly move a manikin toward or away from pictures of novel animals. The training produced more positive self-reported attitudes for the animal that was repeatedly approached and more negative attitudes for the animal that was repeatedly avoided. After the training, children reported more fear of the avoided animal than of the approached animal. Interestingly, children showed a training-congruent confirmation bias effect on an information-seeking task. That is, they displayed a tendency to seek more positive information about the approached animal, whereas they were inclined to search for more negative information about the avoided animal. No significant training effects were observed on implicit attitudes. The finding that a simple approach-avoidance training influences children’s fear-related responses and leads to biased information-seeking behaviors lends support to general theories of fear acquisition in children as well as to models that try to explain the intergenerational transmission of anxiety.     

I—What is the Normative Role of Logic?

The paper tries to spell out a connection between deductive logic and rationality, against Harman's arguments that there is no such connection, and also against the thought that any such connection would preclude rational change in logic. One might not need to connect logic to rationality if one could view logic as the science of what preserves truth by a certain kind of necessity (or by necessity plus logical form); but the paper points out a serious obstacle to any such view.     

Understanding the Diverse Literacy Needs of Profoundly Deaf Sign-Dominant Adults in Australia

This review explores the literacy difficulties experienced by prelingual, profoundly deaf, sign-dominant adults. A critical overview of the existing literature identifies the importance of understanding their language experiences and word-coding preferences. Findings challenge the notion that a permanent lack of audition from birth prevents individuals from developing efficient strategies for the lexical processing of words and raises the possibility that sign-based word coding could play a central role in proficient word reading for those adults who cannot learn to read by way of the auditory perceptual route. The unique resources needed to assist in the development of the literacy skills of this minority group are discussed.     

Phonological Awareness and Reading Proficiency in Adults with Profound Deafness

This study investigated differences in the phonological knowledge and reading skill of deaf adults using three experimental conditions that tested sensitivity to syllables, rhyme, and phonemes. Analysis of response latencies and accuracy in the three awareness tasks demonstrated that skilled deaf readers had superior phonological awareness skill to that of less-skilled readers and showed less reliance on orthography when making their phonological judgments. Rhyme had greater independent predictive strength than syllable or phoneme awareness for reading comprehension. Phoneme awareness did not contribute independently to either reading comprehension or word reading, but it did independently predict application of grapheme-phoneme correspondences.