Characterization and qualification of a CRNA eye dosimeter
Publication date: Available online 28 June 2019Source: Perspectives in ScienceAuthor(s): K. Larabi-Harfouche, F. Dari, A. Herrati, G. Medkour-Boushaki, Z. Lounis-MokraniAbstractThe aim of this work is to study the calibration methodology of a new eye dosimeter, developed by Dosimetry Laboratory of the Nuclear Research Center of Algiers, using TLD-700 thermoluminescent detectors (LiF: Mg, Ti). Qualification and type test of this dosimeter have been performed in terms of operational quantity Hp (3) at Secondary Standard Dosimetry Laboratory (SSDL) using the cylindrical phantom according to ISO12794, ORAMED 2012 and IEC 62387...
Source: Perspectives in Science - June 30, 2019 Category: Science Source Type: research
A New method for determination Solid State Nuclear Track by the change of the specific heat capacity
Publication date: Available online 28 June 2019Source: Perspectives in ScienceAuthor(s): Lu Jin, Yang Tongsuo, Li Yi guo, Shi Yongqian, Zhang Jianxiang, Hua Xiao, Wang Yongcang, Xin duqiang, Zhang YongbaoAbstractA new measurement method for determination Solid State Nuclear Track by the change of the specific heat capacity is proposed. The feasibility of the method is discussed in both theory and practice, to determine the Solid State Nuclear Tracks by specific heat capacity when annealing. In the research, the change of the specific heat capacity is related with nuclear track numbers after annealing and it could be measur...
Source: Perspectives in Science - June 30, 2019 Category: Science Source Type: research
The radionuclide distribution onto different mineral phases of the rocks of the exocontact zone of Nizhnekansky granitoid massif
Publication date: Available online 29 June 2019Source: Perspectives in ScienceAuthor(s): Anastasiya A. Rodionova, Vladimir G. Petrov, Irina E. Vlasova, Stepan N. Kalmykov, Vladislav A. Petrov, Valery V. Poluektov, Jörg HammerAbstractThe sorption experiments with the five rock samples drilled in the deep-well in the exocontact zone of Nizhnekansky granitoid massif (EZNGM) in the range of depth 166 m–476 m were carried out. The distribution of radium was studied. The radiograms of radionuclide sorption were obtained by digital autoradiography. Heterogeneous sorption of radium was demonstrated by digital radiography a...
Source: Perspectives in Science - June 30, 2019 Category: Science Source Type: research
Evaluation of Radiation Risks during CT Brain Procedures for Adults
Publication date: Available online 29 June 2019Source: Perspectives in ScienceAuthor(s): Slimane Semghouli, Bouchra Amaoui, Abdennasser El Kharras, Khalid Bouykhlaf, Oum Keltoum Hakam, Abdelmajid ChoukriAbstractThe purpose of this study is to evaluate the patients’ radiation dose in three different modalities of CT scanners (64, 16 and 2 slices) and the biological effects during CT brain examinations.A total of 60 patients were examined in three different hospitals in Morocco. The data were collected from CT Brain examinations at of 20 CT scans per hospital. For each examination, we have reported CT acquisition parameter...
Source: Perspectives in Science - June 30, 2019 Category: Science Source Type: research
A portable radioactive plume monitor using a silicon photodiode
In this study, a portable radioactive plume monitor using a silicon photodiode was developed for the detection of a radioactive plume (e.g. 131I, 134Cs and 137Cs) in an emergency situation. It was found that the background count rate was proportional to ambient dose equivalent rate and the detection limit for the monitor at 20 μSv h−1 as an ambient dose equivalent rate was evaluated to be 187 Bq m−3 using the ISO11929 method. These results suggest that the detection limit for the system can be decreased effectively by lead shielding with optimized thickness. (Source: Perspectives in Science)
Source: Perspectives in Science - June 30, 2019 Category: Science Source Type: research
Der Einfluss der Stundenlänge (45 vs. 60 Minuten) auf ausgewählte Aspekte der Unterrichtsqualität im Physikunterricht am Gymnasium: - Eine Prä-Post-Untersuchung mit zwei Lehrkräften -
Publication date: December 2016Source: Perspectives in Science, Volume 10Author(s): R. Wackermann, J. HaterKurzfassungObwohl bislang kaum Untersuchungen zur optimalen zeitlichen Strukturierung von Unterricht vorliegen, verlängern einige Schulen in Deutschland zurzeit die Schulstundenlänge auf 60 (auch 65 oder 67,5 usw.) Minuten. Die vorliegende empirische Studie untersucht die Auswirkungen der Stundenverlängerung auf die Unterrichtsqualität im Physikunterricht der Sekundarstufe I. Dazu wurde der 60-Minuten-Unterricht von zwei Lehrkräften aufgezeichnet und ausgewertet und mit dem 45-Minuten-Unterricht derselben LehrkrÃ...
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
Science education with handheld devices: A comparison of Nintendo WiiMote and iPod touch for kinematics learning
Publication date: December 2016Source: Perspectives in Science, Volume 10Author(s): K. Hochberg, J. Kuhn, A. MüllerSummaryExperiential science learning based on the in-built sensors of handheld devices such as smartphones, tablet computer and game consoles has seen quite a strong development in recent years. In particular, such devices with internal acceleration sensors offer an innovative approach to kinematics learning in classroom physics, a notoriously difficult topic for pupils. In view of research and teaching in this domain, the practical advantages and disadvantages of two such devices, the Nintendo WiiMote and th...
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
DIDATTICA DELLA CHIMICA E TRASPOSIZIONE DIDATTICA Parte prima – I fondamenti teorici di una prassi
Publication date: December 2016Source: Perspectives in Science, Volume 10Author(s): Elena Ghibaudi, Ezio Roletto, Alberto RegisRiassuntoDopo una riflessione sulla differenza tra sapere, conoscenza e informazione e sull’equilibrio dei rapporti tra insegnante, allievo e sapere, che una didattica efficace deve garantire, questo lavoro affronta il problema della trasposizione didattica, inteso come il processo attraverso il quale il sapere sapiente può divenire sapere insegnato. Vengono discussi diversi aspetti inerenti la prassi della trasposizione didattica in ambito scientifico e, più specificamente, nella chimica. Tra ...
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
DIDATTICA DELLA CHIMICA E TRASPOSIZIONE DIDATTICA Parte seconda - Un’approccio didattico alla costruzione del concetto di trasformazione chimica
Publication date: December 2016Source: Perspectives in Science, Volume 10Author(s): Elena Ghibaudi, Ezio Roletto, Alberto RegisRiassuntoQuesta seconda parte illustra un esempio di trasposizione didattica realizzata in Italia, in classi della scuola secondaria di II grado. Oggetto della trasposizione sono i concetti di trasformazione chimica, di reazione chimica e di equazione di reazione; un risultato di questo percorso è l’introduzione della distinzione fra le nozioni di atomo e molecola da parte degli allievi stessi, come ipotesi necessaria per interpretare la fenomenologia osservata. L’approccio adottato in questa ...
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
A fairytale creation or the beginning of everything: Students’ pre-instructional conceptions about the Big Bang theory
Publication date: December 2016Source: Perspectives in Science, Volume 10Author(s): Sarah Aretz, Andreas Borowski, Sascha SchmelingSummaryThe beginning of the universe, the Big Bang, being an important subdomain in cosmology, marks the very beginning of space and time. Therefore, it has formed the modern scientific worldview. Transferring this to students through science teaching is a frequent request in science literacy discussion (e.g., American Association for the Advancement of Science, 1993, Schecker et al., 2004).However, it is not yet clear in science education if students’ conceptions about the Big Bang vary by n...
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
Science standards: The foundation of evolution education in the United States
Publication date: December 2016Source: Perspectives in Science, Volume 10Author(s): Elizabeth Watts, Georgy S. Levit, Uwe HoßfeldAbstractScience standards and textbooks have a huge impact on the manner in which evolution is taught in American classrooms. Standards dictate how much time and what points have to be dedicated to the subject in order to prepare students for state-wide assessments, while the textbooks will largely determine how the subject is presented in the classroom. In the United States both standards and textbooks are determined at the state-level through a political process. Currently there is a tremendou...
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
Unravelling glycan complexity—Prologue
Publication date: January 2017Source: Perspectives in Science, Volume 11Author(s): Carsten Kettner, Martin G. Hicks (Source: Perspectives in Science)
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
The impact of defining glycan structures
Publication date: January 2017Source: Perspectives in Science, Volume 11Author(s): Johannes F.G. VliegenthartSummaryFor gaining insight in the mode of action at the molecular level of glycans in biological systems precise knowledge of the structure of the glycans is indispensable. To obtain this fundamental information well-defined starting material, optimal fractionation methods and adequate identification techniques are essential. In this review, the emphasis is on the application of high resolution 1H NMR spectroscopy to the structure determination of glycans of different origin. The power of 1H NMR spectroscopy is the ...
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
Glycan arrays and other tools produced by automated glycan assembly
Publication date: January 2017Source: Perspectives in Science, Volume 11Author(s): Peter H. SeebergerSummaryCarbohydrates are the dominant biopolymer on earth and play important roles ranging from building material for plants to function in many biological systems. Glycans remain poorly studied due to a lack of synthetic tools. The goal of my laboratory has been to develop a general method for the automated assembly of glycans. The general protocols we developed resulted in the commercialisation of the Glyconeer 2.1â„¢ synthesizer as well as the building blocks and all reagents. Oligosaccharides as long as 50-mers are now ...
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
Latest developments in Semantic Web technologies applied to the glycosciences
Publication date: January 2017Source: Perspectives in Science, Volume 11Author(s): Kiyoko F. Aoki-Kinoshita, Nobuyuki P. Aoki, Akihiro Fujita, Noriaki Fujita, Toshisuke Kawasaki, Masaaki Matsubara, Shujiro Okuda, Toshihide Shikanai, Daisuke Shinmachi, Elena Solovieva, Yoshinori Suzuki, Shinichiro Tsuchiya, Issaku Yamada, Hisashi NarimatsuSummaryThe Integrated Life Science Database Project of Japan funded a group of glycoscientists to carry out a project to integrate glycoscience databases using Semantic Web technologies. As a continuation of the previous project period, the Japan Consortium for Glycobiology and Glycotechno...
Source: Perspectives in Science - July 11, 2018 Category: Science Source Type: research
