IR Inspection Windows – See What You’ve Been Missing

An Infrared Inspection Window is a window that is used to separate environments of differing pressures or temperatures while allowing light energy at a specified electromagnetic wavelength to pass between the two environments. Source: IR/INFO.ORG…

Girls’ chance of success at school in Sub-Saharan Africa shaped by language they are taught in

A new report argues that efforts to increase girls’ participation in education in different parts of Africa should assess the detrimental effect teaching in English is having on learning. Source: STEM Education News…

Empathy softens teachers’ biases, reduces racial gap in student suspensions

Interventions that seek to evoke empathy in teachers can sideline biases and narrow the racial gap in suspensions of middle school students, according to the results of a large-scale study to combat race-based inequity in school discipline. Source: STEM Education News…

The irony of the magnet system for Kibble balances—a review

The magnet system is an essential component of the Kibble balance, a device that is used to realize the unit of mass. It is the source of the magnetic flux, and its importance is captured in the geometric factor Bl . Ironically, the Bl factor cancels out and does not appear in the final Kibble equation. Nevertheless, care must be taken to design and build the magnet system because the cancellation is perfect only if the Bl is the same in…

Achievement of 0.005% combined transfer uncertainties in the NIST detector calibration facility

Improvements in a lamp-monochromator-based facility at the National Institute of Standards and Technology (NIST), the Visible near-infrared Spectral Comparator Facility (VisSCF) which is used to calibrate optical detectors for spectral radiant power responsivity from 300 nm to 1100 nm, are described. These changes include extending the VisSCF operational range down to 300 nm from 350 nm, thereby fully covering the ultraviolet-A (UVA) spectral region and partially covering the UVB range. These improvements have lowered the magnitudes of most of the components in the uncertainty budget…

Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Spectral irradiance scale in the wavelength range from 250 nm to 2500 nm was realized at National Institute of Metrology on the basis of a large area tungsten carbide–carbon (WC–C) high temperature fixed point blackbody, which is composed of a 14 mm diameter WC–C fixed point cell and a variable temperature blackbody BB3500MP as a furnace. A series of 1000 W FEL tungsten halogen lamps were used as transfer standards. The new spectral irradiance scale was compared with the scale based on a variable-temperature blackbody…

Want students to do better in class? Send them on culturally enriching field trips

Students who attended three different field trips in fourth or fifth grade scored higher on end-of-grade exams, received higher course grades, were absent less often and had fewer behavioral infractions. These benefits were strongest when students entered middle school. Source: STEM Education News…

Poor fidelity may mean effective education strategies never see light of day

Promising new education interventions are potentially being ‘unnecessarily scrapped’ because trials to test their effectiveness are insufficiently faithful to the original research, a study warns. Researchers ran a large-scale computer simulation to examine how much ‘fidelity’ compromises the results of school-based trials of new learning innovations and strategies. ‘Fidelity’ is the extent to which these evaluations adhere to the original research on which the educational intervention is based. Source: STEM Education News…