The new option view of investment

"February 1995."Includes bibliographical references.Supported by the U.S. Dept. of Energy. DE-FG41-92R110447 Supported by the National Science Foundation. SES90-22823Avinash K. Dixit, Robert S. Pindyck

Expandability, reversibility, and optimal capacity choice

Includes bibliographical references (p. 27-28).Research supported by the National Science Foundation and by the MIT Center for Energy and Environmental Policy Research.by Avinash K. Dixit and Robert S. Pindyck

Micromegas TPC studies at high magnetic fields using the charge dispersion signal

The International Linear Collider (ILC) Time Projection Chamber (TPC) transverse space-point resolution goal is 100 microns for all tracks including stiff 90 degree tracks with the full 2 meter drift. A Micro Pattern Gas Detector (MPGD) readout TPC can achieve the target resolution with existing techniques using 1 mm or narrower pads at the expense of increased detector cost and complexity. The new MPGD readout technique of charge dispersion can achieve good resolution without resorting to narrow pads. This has been demonstrated previously for 2 mm x 6 mm pads with GEMs and Micromegas in cosmic ray tests and in a KEK beam test in a 1 Tesla magnet. We have recently tested a Micromegas-TPC using the charge dispersion readout concept in a high field super-conducting magnet at DESY. The measured Micromegas gain was found to be constant within 0.5% for magnetic fields up to 5 Tesla. With the strong suppression of transverse diffusion at high magnetic fields, we measure a flat 50 micron resolution at 5 Tesla over the full 15 cm drift length of our prototype TPC.Comment: 7 pages, 3 figure

Job Satisfaction and Values among Kendriya Vidalaya Teachers

The aim of this study was to analyze the job satisfaction and values among Kendriya Vidalaya Teachers in Jammu city (J&K). . In this research, 59 male and 91 female teachers, 150 in total, working in different branches of   Kendriya  Vidyalayas were examined. The data was collected by using English version of teacher’s value inventory developed and validated  by Dr. (Mrs) Harbhajan L. Singh & S.P. Ahluwalia  and job satisfaction(DJSS) developed and validated by Merra Dixit. The study revealed that there were be no significant differences in values (T,E,A,S,R,P) among male Kendriya  Vidyalaya Teachers with high job satisfaction  and low job  satisfaction  Furthermore, it was again revealed that there were  be no significant differences in values (T,E,A,S,R,P) among  female Kendriya  Vidyalaya  Teachers with  high job satisfaction  and low job  satisfaction. Key words:  Values, job satisfaction, Kendriya  Vidyalaya  teacher

Board game Dixit as a tool for development of students’ physics concepts

INTRODUCTION Game-Based Learning is an educational approach which uses games as an educational tool. There are many benefits of using educational games, such as increase in students’ motivation and engagement in the educational process, change in attitude to the subject, etc. In this contribution, we discuss our experience with using a modification of the board game Dixit to develop students’ physics concepts. THE GAME Dixit is a board game consisting of big cards with illustrations. During the game one player chooses one of his cards and gives others a clue to this card. Then every other player chooses one of his cards, which can be interpreted by the clue. All chosen cards are mixed up and players need to find the card originally referred by the clue (Roubira, 2021). For our research, Dixit was modified in a way that players need to use clues with physics context. Also, for this modification, a new set of cards was mixed from original cards. The goal of this modification is to bring students to discussion about physics terms, to verbalize students’ ideas and physics concepts and to confront their ideas with the ideas of other students. RESEARCH In a broader research study focused on the use of game-based learning in physics education, we wanted to find out whether the use of selected games brings benefits to students' knowledge and skills. The partial question in this context is, whether playing a modified Dixit can be used to develop students' understanding of physics terms. To answer this question, three steps were followed. The first step was to create a suitable set of pictures (cards) and to find out what physics concepts are associated with them by graduates of general upper secondary education. To achieve this, 35 first-year university students were randomly allocated 10 of 118 cards with the task to write as many physics terms as possible for each of the assigned pictures. Subsequently, 84 cards were selected for further use. In the second step, modified Dixit was tested by pre-service physics teachers. In the third step, the game was played by upper secondary students during physics lessons. In second and third step, terms used by students and students’ discussions were recorded by report sheet and audio recording. Students’ need for discussion about used terms and cards, variability and specificity of used terms and students’ attitudes to the game were investigated. Results of the research will be presented at the conference. ACKNOWLEDGEMENT This work has been supported by Slovak KEGA grant 059UK-4/2022 and by Granty mladých UK UK/233/2022. REFERENCES Greipl, S., Moeller, K., & Ninaus, M. (2020). Potential and limits of game-based learning. International Journal of Technology Enhanced Learning, 12(4), 363-389. https://doi.org/10.1504/IJTEL.2020.110047 Roubira, J. (2021). Dixit Rulebook. Retrieved August 19, 2022, from https://www.libellud.com/wp-content/uploads/2022/03/DIXIT_REFRESH_RULES_US-UK-AU_BD.pd

Combined Effect of Multistage Processing and Treatment Methods on the Physical, Chemical, and Microstructure Properties of Recycled Concrete Aggregates

This research aims to examine the effects of multi-stage processing on reducing the old cement fractions and enhancing the quality of CRA (concrete recycled aggregate). The investigation involves the use of demolished concrete debris and subsequent treatments in both single and multi-stage processes. The recycled aggregates (RA) were obtained using a multi-stage jaw crushing process followed by utilising natural aggregate, untreated RA, RA treated with hydrochloric acid and sodium silicate immersion (single stage treatment) and RA treated with mechanical scrubbing and sodium silicate immersion in two separate stages (multi-stage treatment). The subsequent phase of the experimental inquiry involves assessing the physical attributes of both treated and untreated RA. This is followed by conducting microstructural examinations utilising techniques such as scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetry-differential thermal analysis (TG-DTA). The findings indicate that employing a two-step process, involving mechanical abrasion followed by immersion in sodium silicate, yields high-quality CRA. This conclusion is reinforced by the favourable physical performance observed. The water absorption values of CRA were lowered by 78% through single-stage treatments such as immersion in hydrochloric acid. The similar treatment is found to show densest concrete with Ca/Si ratio reduced to around 81% to that of untreated CRA. Additionally, for single stage treated CRA samples, microstructural study using FTIR verified the creation of additional hydration products, whereas for two stages treated CRA specimens, TGA analysis demonstrated the formation of stable CSH. According to the findings, it is advised to use a multi-stage process of jaw crushing, then treating it with mechanical abrasion and sodium silicate. This has the ability to improve the physical, chemical, and microstructural properties of CRA