ChemInform Abstract: Characteristic Reactions of 4-Siloxy-2,5-dihydrooxepins: Desilylation, (2 + 2) and (4 + 2) Cycloadditions.

ChemInform ◽  
2010 ◽  
Vol 26 (14) ◽  
pp. no-no
Author(s):  
B. HOFMANN ◽  
H.-U. REISSIG
2000 ◽  
Vol 18 (1) ◽  
pp. 56-64 ◽  
Author(s):  
A. J. Stocker ◽  
N. F. Arnold ◽  
T. B. Jones

Abstract. Characteristic signatures are often observed in HF radar range-time-intensity plots when travelling ionospheric disturbances (TIDs) are present. These signatures, in particular the variation of the F-region skip distance, have been synthesised using a ray tracing model. The magnitude of the skip variation is found to be a function of the peak electron density perturbation associated with the TID and radar frequency. Examination of experimental observations leads to an estimate of the peak electron density perturbation amplitude of around 25% for those TIDs observed by the CUTLASS radar system. The advantage of using the skip variation over the radar return amplitude as an indicator of density perturbation is also discussed. An example of a dual radar frequency experiment has been given. The investigation of the effect of radar frequency on the observations will aid the optimisation of future experiments..Key words. Ionosphere (auroral ionosphere; ionosphere -atmosphere interactions; ionospheric disturbances)


ChemInform ◽  
2010 ◽  
Vol 32 (34) ◽  
pp. no-no
Author(s):  
Huan-tang Yuan ◽  
Rui Cao ◽  
Lian-bang Wang ◽  
Yi-jing Wang ◽  
Xue-ping Gao ◽  
...  

2022 ◽  
Vol 2022 ◽  
pp. 1-12
Author(s):  
Ying Liu ◽  
Sheng-Yuan Wang ◽  
Xiao-Lan Wu ◽  
Jing Liang

How entrepreneurial firms can enhance the level of exploratory and exploitative improvisation in a balanced manner to enhance organizational dynamics has become an important research topic. Current research on the triggers of duality entrepreneurial improvisation has just started, exploring mainly abstract characteristic variables, and has not paid attention to the impact of entrepreneurs’ daily behaviors. In order to make up for the shortcomings of current research, the research goal of this paper is to construct a triggering model of entrepreneurs’ improvisation based on the research of entrepreneurs’ daily behaviors and then to evaluate the influence of the improvisational behavior trigger patterns. Based on the paradoxical and theoretical perspective of duality, a structured observation method is used to explore which behavioral patterns of entrepreneurs tend to trigger dual improvisational behaviors in themselves, their teams, and their organizations. After observing and recording the creators and collecting phenomenal data, six entrepreneurial behavior patterns containing 39 specific operational behaviors have been extracted from the phenomenal data by drawing on the rooted theory approach. In addition, the influence of entrepreneurial patterns is evaluated and ranked using the pairwise hesitant fuzzy set evaluation method. This study reveals the relationship between entrepreneurs’ daily behaviors and dyadic entrepreneurial improvisation at the operational level and provides guiding plans for entrepreneurs to improve their own and their organizations’ improvisation levels.


2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Sri Rejeki Dwi Astuti ◽  
Anggi Ristiyana Puspita Sari ◽  
Rizki Nor Amelia

Good learning media is the media that can make it easier for students to understand a teaching material. The selection of learning media must be in accordance with these characteristics. To simplify the explanation of the atomic structure which has abstract characteristic, a learning media that can realize this material is needed. This research aims to develop interactive animation learning media Chem is Fun based on quantum learning and to determine the quality of the resulting product. The development model used is adapting the ADDIE. This research involved a media expert, a material expert, three peer reviewers and five reviewers (chemistry teacher) to assess product quality. The research instruments consist of two types of instrument, i.e. suggestion sheet and product quality questionnaire. The result show that the product of Chem is Fun has a good quality, so that it can be used as a learning media to help students' learning process on atomic structure.


Sign in / Sign up

Export Citation Format

Share Document