scholarly journals Redox Potential and Crystal Chemistry of Hexanuclear Cluster Compounds

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3069
Author(s):  
Elena Levi ◽  
Doron Aurbach ◽  
Carlo Gatti

Most of TM6-cluster compounds (TM = transition metal) are soluble in polar solvents, in which the cluster units commonly remain intact, preserving the same atomic arrangement as in solids. Consequently, the redox potential is often used to characterize structural and electronic features of respective solids. Although a high lability and variety of ligands allow for tuning of redox potential and of the related spectroscopic properties in wide ranges, the mechanism of this tuning is still unclear. Crystal chemistry approach was applied for the first time to clarify this mechanism. It was shown that there are two factors affecting redox potential of a given metal couple: Lever’s electrochemical parameters of the ligands and the effective ionic charge of TM, which in cluster compounds differs effectively from the formal value due to the bond strains around TM atoms. Calculations of the effective ionic charge of TMs were performed in the framework of bond valence model, which relates the valence of a bond to its length by simple Pauling relationship. It was also shown that due to the bond strains the charge depends mainly on the atomic size of the inner ligands.

2013 ◽  
Vol 22 (1) ◽  
pp. 96-101 ◽  
Author(s):  
Minghui Li ◽  
Xinggang Wang ◽  
Yuquan Xie ◽  
Yeqing Xie ◽  
Xian Zhang ◽  
...  

2018 ◽  
Vol 10 (10) ◽  
pp. 3456 ◽  
Author(s):  
Peng Jiang ◽  
Yi-Chung Hu ◽  
Ghi-Feng Yen ◽  
Hang Jiang ◽  
Yu-Jing Chiu

As a crucial part of producer services, the logistics industry is highly dependent on the manufacturing industry. In general, the interactive development of the logistics and manufacturing industries is essential. Due to the existence of a certain degree of interdependence between any two factors, interaction between the two industries has produced a basis for measurement; identifying the key factors affecting the interaction between the manufacturing and logistics industries is a kind of decision problem in the field of multiple criteria decision making (MCDM). A hybrid MCDM method, DEMATEL-based ANP (DANP) is appropriate to solve this problem. However, DANP uses a direct influence matrix, which involves pairwise comparisons that may be more or less influenced by the respondents. Therefore, we propose a decision model, Grey DANP, which can automatically generate the direct influence matrix. Statistical data for the logistics and manufacturing industries in the China Statistical Yearbook (2006–2015) were used to identify the key factors for interaction between these two industries. The results showed that the key logistics criteria for interaction development are the total number of employees in the transport business, the volume of goods, and the total length of routes. The key manufacturing criteria for interaction development are the gross domestic product and the value added. Therefore, stakeholders should increase the number of employees in the transport industry and freight volumes. Also, the investment in infrastructure should be increased.


2016 ◽  
Vol 19 (1) ◽  
pp. 61-70
Author(s):  
Thuan Quoc Pham ◽  
Dao Xuan La

The objective of this study is to identify the major factors that impact on the quality of financial reporting and to suggest model of the factors affecting on the quality of financial reporting for Vietnamese enterprises . There are two factors group affecting on the quality of financial reporting: internal factors and external factors, this study is limited to the scope of the external factors. By using case studies, analytical results indicate that Tax Pressure factor has the greatest impact on the quality of financial reporting, the remaning factors include: Listed Securities, Accounting Software and Independent Audit. Two factors, Politics and Regulatory Environment have limited impact on the quality financial reporting.


Author(s):  
K. B. E. E. Eimeleus

This chapter shows how the quality of snow and its behavior are the most influential factors affecting a ski run. Both can change depending on the time of year and the weather. As such, a skier's speed and stamina are closely bound to these two factors. Snow and weather exert more influence than one might think: for example, in nice weather a good skier can cover from 80 to 100 versts in a day but in bad weather one's daily distance could be less. The chapter thus categorizes snow briefly as powdery, loose, granulated, thick-packed crust, thin-layer crust, floury, springtime, and waterlogged. Each of these can have varying effects on skis.


1968 ◽  
Vol 8 (35) ◽  
pp. 702 ◽  
Author(s):  
DF Smith

Mixed swards of barley grass (Hordeum leporinum) and subterranean clover (Trifolium subterraneum) of two densities were grown at two levels of nitrogen. Growth was started at two different times mid- April and mid-May-and at each time half the plots were subjected to moisture stress. The swards were harvested after nine weeks of growth. The survival of clover plants was reduced by an early start, moisture stress and nitrogen addition : much more so than barley grass. The root : shoot ratios of both species were calculated ; both showed some sensitivity to the time of break and moisture stress, and the grass was also affected by the other two factors. Total sward production and the ratios of clover to grass varied widely Grass daminance was favoured by moisture stress or a late break, and both of these factors tended to override the effect of higher soil nitrogen in determining clover-grass balance. Total sward production more dependent on density than any other factor, especially with the later start. Higher nitrogen was effective in boosting production only if the break was early and there was no moisture stress.


Author(s):  
Leah Raju George ◽  
Thenmozhi Mani ◽  
Ekta Rai

Background: Labour analgesia though widely practised is still not routinely administered to all parturients in India. We conducted this historical observational cross-sectional study to assess parturient knowledge and factors affecting satisfaction in those who received epidural labour analgesia; aiming at improving the services.Methods: All parturients requesting epidural labour analgesia have the catheter sited and the drug administered as per institutional protocols. A feedback form is given to these parturients, postnatally. The form consists of questions regarding her knowledge of and experience with labour analgesia, including her satisfaction score on a scale of 0 to 10. Author collected these forms and analyzed them along with information from the labour epidural register and the discharge summary.Results: The mean satisfaction score was 7.1 (SD- 2.28). 46 parturients (31.08%) had ‘low satisfaction’ (<7 score) and 102 parturients (68.9%) had ‘high satisfaction’ (≥7 score). The timing of initiation of epidural analgesia within the parturients expectations and adequate analgesia were two factors that were found to affect satisfaction scores, with statistically significant values (p=0.002 and p=0.006 respectively). Those with a very short or very long duration of labour analgesia, were more likely to give less satisfaction scores (p=0.023 and p=0.002). Only 30% of parturients had heard of labour analgesia in the past.Conclusions: In this setting good analgesia and receiving it on time are of utmost importance in those receiving epidural labor analgesia, emphasising the need for adequate analgesia and prompt initiation of the same.


Forests ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 903 ◽  
Author(s):  
Miha Humar ◽  
Davor Kržišnik ◽  
Boštjan Lesar ◽  
Christian Brischke

Wood is one of the most important construction materials, and its use in building applications has increased in recent decades. In order to enable even more extensive and reliable use of wood, we need to understand the factors affecting wood’s service life. A new concept for characterizing the durability of wood-based materials and for predicting the service life of wood has recently been proposed, based on material-inherent protective properties, moisture performance, and the climate- and design-induced exposure dose of wooden structures. This approach was validated on the decking of a model house in Ljubljana that was constructed in October 2013. The decay and moisture content of decking elements were regularly monitored. In addition, the resistance dose DRd, as the product of the critical dose Dcrit, and two factors taking into account the wetting ability of wood (kwa) and its inherent durability (kinh), were determined in the laboratory. DRd correlated well with the decay rates of the decking of the model house. Furthermore, the positive effect of thermal modification and water-repellent treatments on the outdoor performance of the examined materials was evident, as well as the synergistic effects between moisture performance and inherent durability.


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