Using Technology within the Teacher Preparation Program as a Model for Effective Instruction

This article describes a methods course for teachers of elementary science and how it was enhanced to increase students’ abilities and attitudes toward using technology as a tool in teaching science. The course was enhanced as a result of the Virginia Collaborative for Excellence in the Preparation of Teachers (VCEPT) project. Prior to this project, the course was known for its constructivist approach, cooperative group activities, and experiential base that allowed students to actually do and teach elementary science. As a result of VCEPT, the class now also features an elaborate technology component. Technology of many types are regularly modeled in the methods classroom. Students are exposed to and have hands-on experiences with selected technologies and are asked to use technology in order to complete a variety of different projects

Biblioteka wiejska, miejska lub gminna – „Cyfrowym Archiwum Tradycji Lokalnej”?

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Low and high intensity velocity selective coherent population trapping in a two-level system

An experimental investigation is made of sub-recoil cooling by velocity selective coherent population trapping in a two-level system in Sr. The experiment is carried out using the narrow linewidth intercombination line at 689 nm. Here, the ratio between the recoil shift and the linewidth is as high as 0.64. We show that, on top of a broader momentum profile, subrecoil features develop, whose amplitude is strongly dependent on the detuning from resonance. We attribute this structure to a velocity selective coherent population trapping mechanism. We also show that the population trapping phenomenon leads to complex momentum profiles in the case of highly saturated transitions, displaying a multitude of subrecoil features at integer multiples of the recoil momentum.Comment: 6 pages and 7 figure

Porphyrias associated with malignant tumors: Results of treatment with ionizing irradiation

Background: Porphyrin metabolism disorders, known as porphyria, represent inherited or acquired diseases. The development of porphyria due to light sensibility occurs especially with exposure to wavelengths in the range of 300-700 nm. Skin reactions and neurovisceral dysfunctions are known side effects of ionizing irradiation. It can be postulated that during or after ionizing irradiation treatment of patients affected with tumor and porphyria, severe side effects might appear, in contrast to patients without porphyria. This paper describes the treatment of 2 patients affected with tumor and concomitant porphyria. Patients: One female patient suffering from intermittent porphyria and breast cancer and one male patient suffering from porphyria cutanea tarda and bladder cancer were treated with ionizing irradiation (electrons and photons). No abnormalities nor any severe general or local side effects could be observed. Conclusion: Radiation therapy is not a `stimulating' factor in activating porphyria symptoms

An atomic test of higher-order interference

Canonical quantum formalism predicts that the interference pattern registered in multi-slit experiments should be a simple combination of patterns observed in two-slit experiments. This has been linked to the validity of Born's rule and verified in precise experiments with photons as well as molecules via nuclear magnetic resonance. Due to the expected universal validity of Born rule, it is instructive to conduct similar tests with yet other physical systems. Here we discuss analogs of triple-slit experiment using atoms allowing tripod energy level configuration, as realisable e.g. with alkaline-earth-like atoms. We cover all the stages of the setup including various ways of implementing analogs of slit blockers. The precision of the final setup is estimated and offers improvement over the previous experiments.Comment: 7 pages, 4 figure