28,965 research outputs found
Tungsten-rhenium alloy thermocouples effective for high-temperature measurement
Tungsten-rhenium alloy thermocouples, specifically, insulated, sheathed W/W plus 26Re and W plus 5 Re/W plus 26 Re thermocouples, are effective for temperature measurement in excess of 2920 degrees C. These thermocouples have a high thermoelectric output and excellent relationship to temperatures up to 2760 degrees C
Folk Pedagogies of Change: Developing an Early Years Education Development Strategy for China
Reform initiatives are common throughout the Chinese early years education sector. This paper proposes a conceptual framework of a folk pedagogy of change as a perspective on the systemic barriers to the development of practice which foregrounds some of the tensions within and across these barriers. Our analysis is based on three commissioned literature reviews and site visits with practitioners and parents to Chinese Kindergarten and early years settings. The use of situated learning theory as a perspective for analysing interconnected and interdependent organisations is offered as a way of extending our understanding of educational change. This enables a move beyond a simplistic and essentialist notion of culture which locates implementation problems at the incompatibility of varied cultural perspectives. A folk pedagogy of change can help to understand why a range of educational contexts might be resistant to externally generated ideas for educational change
Water resource problems of energy projects in the Colorado River Basin
The successful development of western coal and oil shale deposits
is dependent, to a significant degree, on the availability of adequate
water supplies. EQL is involved in a study of the aggregate effects
of various energy activities in the upper Colorado River Basin on
downstream water quantity and quality. These activities will tend
to reduce the available water in the river, and could increase its
salinity, which is already so high as to interfere with downstream
domestic and agricultural use
Re-entrant magnetic field induced charge and spin gaps in the coupled dual-chain quasi-one dimensional organic conductor Perylene[Pt(mnt)]
An inductive method is used to follow the magnetic field-dependent
susceptibility of the coupled charge density wave (CDW) and spin-Peierls (SP)
ordered state behavior in the dual chain organic conductor
Perylene[Pt(mnt)]. In addition to the coexisting SP-CDW state phase
below 8 K and 20 T, the measurements show that a second spin-gapped phase
appears above 20 T that coincides with a field-induced insulating phase. The
results support a strong coupling of the CDW and SP order parameters even in
high magnetic fields, and provide new insight into the nature of the magnetic
susceptibility of dual-chain spin and charge systems.Comment: 6 pages, 6 figure
Advances in Moire interferometry for thermal response of composites
An experimental technique for the precise measurement of the thermal response of both sides of a laminated composite coupon specimen uses Moire interferometry with fringe multiplication which yields a sensitivity of 833 nm (32.8 micro in.) per fringe. The reference gratings used are virtual gratings and are formed by partially mirrorized glass prisms in close proximity to the specimen. Results are compared with both results obtained from tests which used Moire interferometry on one side of composite laminates, and with those predicted by classical lamination theory. The technique is shown to be capable of producing the sensitivity and accuracy necessary to measure a wide range of thermal responses and to detect small side to side variations in the measured response. Tests were conducted on four laminate configurations of T300/5208 graphite epoxy over a temperature range of 297 K (75 F) to 422 K (300 F). The technique presented allows for the generation of reference gratings for temperature regimes well outside that used in these tests
A Preliminary List of Pipunculidae (Diptera) of Iowa
The big-headed flies, as these small insects are commonly called, are easily recognized by their very large, almost spherical head. They are small black flies four to five mm. long with wings two to three mm. longer than the abdomen. The basal cells are elongate; the anal cell reaches almost to the wing margin and is rarely incomplete. The apical cell is narrowed at the tip, but is never closed. There are three posterior cells with complete veination in all the genera except Chalarus Walker
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