Fiber-optic push-pull sensor systems

Fiber-optic push-pull sensors are those which exploit the intrinsically differential nature of an interferometer with concommitant benefits in common-mode rejection of undesired effects. Several fiber-optic accelerometer and hydrophone designs are described. Additionally, the recent development at the Naval Postgraduate School of a passive low-cost interferometric signal demodulator permits the development of economical fiber-optic sensor systems

Temporal tracking of mineralization and transcriptional developments of shell formation during the early life history of pearl oyster Pinctada maxima

Molluscan larval ontogeny is a highly conserved process comprising three principal developmental stages. A characteristic unique to each of these stages is shell design, termed prodissoconch I, prodissoconch II and dissoconch. These shells vary in morphology, mineralogy and microstructure. The discrete temporal transitions in shell biomineralization between these larval stages are utilized in this study to investigate transcriptional involvement in several distinct biomineralization events. Scanning electron microscopy and X-ray diffraction analysis of P. maxima larvae and juveniles collected throughout post-embryonic ontogenesis, document the mineralogy and microstructure of each shelled stage as well as establishing a timeline for transitions in biomineralization. P. maxima larval samples most representative of these biomineralization distinctions and transitions were analyzed for differential gene expression on the microarray platform PmaxArray 1.0. A number of transcripts are reported as differentially expressed in correlation to the mineralization events of P. maxima larval ontogeny. Some of those isolated are known shell matrix genes while others are novel; these are discussed in relation to potential shell formation roles. This interdisciplinary investigation has linked the shell developments of P. maxima larval ontogeny with corresponding gene expression profiles, furthering the elucidation of shell biomineralization

History of marketing thought : an update / BEBR No. 857

Includes bibliographical references (p. 21-26)

Self-assessment for autonomous language learners

This paper discusses why self-assessment is an important tool in the toolkit of autonomous language learners. It can be used both as a testing device leading to accreditation and as a device for personal self-monitoring. It provides the learner with immediate feedback to determine language proficiency and to reflect on learning strategies. There are great benefits to be derived from self-assessment but it is a technique that needs to be introduced carefully and accompanied by considerable awareness raising and support. This paper discusses how to maximise the benefits while minimising the pitfalls. It also describes the teacher's role in the process and the different levels of learner involvement from self-administering a pre-packaged test through to using self-produced tests

The Thermal Degradation of Polychloroprene

The thermal degradation of polychloroprene has been examined by thermoanalytical techniques. These indicate that under temperature programmed conditions, degradation occurs in two main stages, namely dehydrochlorination with a rate maximum (at 10/min.) of 37

Roadside Rest Areas

https://digitalmaine.com/tourism_books/1016/thumbnail.jp