scholarly journals Direct C-H:C-H Arylation Polymerization of 3,4-Propylenedioxythiophene Derivatives

2021 ◽  
Author(s):  
Nagaraj Nayak ◽  
Shruti Shirke ◽  
Snehal Shriwardhankar ◽  
Anil Kumar
Keyword(s):  
Environmentally Friendly ◽  
Aryl Halides ◽  
Palladium Acetate ◽  
Direct Heating ◽  
Whole Process ◽  
Polymerization Mixture ◽  
First Time

In this manuscript, we report, for the first time, a direct C-H:C-H arylation process for the polymerization of 3,4-propylenedioxythiophene derivatives. The requirement of aryl halides monomers can be completely excluded in this process, making the process atom economical and environmentally friendly. We could successfully homopolymerize Prodot-diethylhexyl using palladium acetate as catalyst. The optimized process required the stepwise ramping of the temperature from 70 °C to 140 °C. It was also observed that a direct heating of the polymerization mixture to 140 °C results in the decomposition of the catalyst leading to unsuccessful polymerization. At present, the exact mechanism of the whole process is not clear.

scholarly journals A MAPPING METHOD OF SLAM BASED ON LOOK UP TABLE

2017 ◽  
Vol IV-2/W4 ◽  
pp. 407-410
Author(s):  
Z. Wang ◽  
J. Li ◽  
A. Wang ◽  
J. Wang
Keyword(s):  
Mapping Method ◽  
Good Choice ◽  
Feature Points ◽  
Key Frame ◽  
Whole Process ◽  
Look Up Table ◽  
Localization And Mapping ◽  
Tracking Direction ◽  
The Look ◽  
First Time

In the last years several V-SLAM(Visual Simultaneous Localization and Mapping) approaches have appeared showing impressive reconstructions of the world. However these maps are built with far more than the required information. This limitation comes from the whole process of each key-frame. In this paper we present for the first time a mapping method based on the LOOK UP TABLE(LUT) for visual SLAM that can improve the mapping effectively. As this method relies on extracting features in each cell divided from image, it can get the pose of camera that is more representative of the whole key-frame. The tracking direction of key-frames is obtained by counting the number of parallax directions of feature points. LUT stored all mapping needs the number of cell corresponding to the tracking direction which can reduce the redundant information in the key-frame, and is more efficient to mapping. The result shows that a better map with less noise is build using less than one-third of the time. We believe that the capacity of LUT efficiently building maps makes it a good choice for the community to investigate in the scene reconstruction problems.

An Empirical Analysis on Financial Capability and Operating Performance of China’s Listed Tourism Companies

2011 ◽  
Vol 204-210 ◽  
pp. 1009-1013
Author(s):  
Jing Pu Chen ◽  
Na Zhang
Keyword(s):  
Empirical Analysis ◽  
Operating Performance ◽  
Tourism Industry ◽  
Financial Capability ◽  
Turnover Ratio ◽  
Whole Process ◽  
Important Relationship ◽  
Inventory Turnover ◽  
First Time ◽  
The Relationship

In this paper, we made an empirical analysis on China's listed tourism companies’ financial capability and operating performance. We used the SPSS software. We could learn the whole process from table 2 to table 5. This is the first time analyzing the relationship between financial capability and operating performance in tourism industry. The result shows that indicator of sales margin ratio has the most important relationship with operating performance, followed by the debt-to-asset ratio, inventory-turnover ratio and receivables-turnover ratio. The result is significant to the development of tourism industry in the future. China’s tourism companies should use the financial leverage moderately and improve the inventory-turnover ratio and receivables-turnover ratio constantly to make the company's operating performance reach to a new height.

Ground to conduct: mechanochemical synthesis of a metal–organic framework with high proton conductivity

2015 ◽  
Vol 51 (36) ◽  
pp. 7637-7640 ◽  
Author(s):  
Dariusz Matoga ◽  
Marcin Oszajca ◽  
Marcin Molenda
Keyword(s):  
Proton Conductivity ◽  
Mechanochemical Synthesis ◽  
Metal Organic Framework ◽  
Environmentally Friendly ◽  
High Proton Conductivity ◽  
Proton Conducting ◽  
High Proton ◽  
Metal Organic ◽  
First Time ◽  
Organic Framework

A high proton-conducting metal–organic framework (PCMOF) is prepared for the first time by economical and environmentally-friendly mechanochemistry.

Editorial - Special Issue on VR and HCI Labs

2011 ◽  
Vol 2 (2) ◽  
pp. 1
Author(s):  
Fátima L.S. Nunes ◽  
Carla Dal Sasso Freitas
Keyword(s):  
Virtual Reality ◽  
Multimodal Interaction ◽  
Interactive Systems ◽  
Special Issue ◽  
Prospective Students ◽  
3D Interaction ◽  
Single Issue ◽  
Whole Process ◽  
Editorial Special Issue ◽  
First Time

This special issue of the SBC Journal on 3D Interactive Systems is dedicated to the dissemination of the activities of several groups working on virtual reality, 3D graphics, 3D interaction, multimodal interaction and related themes in Brazil and other countries. Through this initiative the SBC Journal on 3D Interactive Systems is innovating: it is the first time that a Brazilian journal publishes, in a single issue, information regarding different laboratories for prospective students and potential collaborators.The papers selected for this issue introduce Virtual Reality, Graphics and Human Computer Interaction laboratories, their mission and goals, as well as interesting results from their recent projects. This will benefit the scientific community as a whole. It is a special opportunity for the different research groups to introduce themselves, describe their interests and areas of activity, as well as their research directions, thus enabling contacts and potential cooperation.We received 30 manuscripts and, after a peer review phase, we selected 26 technical communications. Most of the VR and CG research laboratories in Brazil are represented; some are more dedicated to virtual reality and graphics applications, others also work with image processing for improving interaction. We also received interesting contributions from laboratories in other countries like Czech Republic, Denmark, Germany, New Zealand, Spain, Switzerland and United Kingdom, as well as from a trans-national group involving Belgium, France, Italy, Germany, Georgia, Hungary, Netherlands, Poland, Spain and United Kingdom.In a general way, readers will find information about research on interaction devices, gesture recognition-based interaction, collaborative interaction, and innovative ways of interaction with tablets and walls. Also several 3D interactive visualization and rendering techniques are well explored by VR and CG researchers. Applications related to health care, chemistry, arts, among others, are some of the topics that the labs are pursuing in their projects. All the groups are interested in receiving students and establishing collaboration for new projects. Thus, we hope the content of the papers here presented can help researchers in finding partners and, in this way, improving their contribution to the fields of VR, CG and HCI.We would like to express our thanks to the editor-in-chief, Luciana Nedel, for inviting us to be guest editors, but mainly for shaping the idea of this special issue. We also thank the reviewers for their help with insightful revisions, and the authors for their interesting contributions as well as for the willingness in the whole process of preparing this issue.

Optimization and validation of an environmentally friendly method for zinc determination in new and used lubricating oil samples

2016 ◽  
Vol 8 (48) ◽  
pp. 8435-8442 ◽  
Author(s):  
Mariana F. B. Mota ◽  
Ednilton M. Gama ◽  
Guilherme D. Rodrigues ◽  
Letícia M. Costa
Keyword(s):  
Environmentally Friendly ◽  
Lubricating Oil ◽  
Phase System ◽  
Two Phase ◽  
Aqueous Two Phase System ◽  
Used Lubricating Oil ◽  
Zinc Determination ◽  
First Time ◽  
Environmentally Friendly Method

This work presents the optimization and validation of a new environmentally friendly method for zinc quantification in new and used lubricating oil samples, using, for the first time, the extracting agent diphenylthiocarbazone (dithizone) associated with the aqueous two-phase system (ATPS).

Environmentally friendly high performance homopolymerized epoxy using hyperbranched epoxy as a modifier

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 14211-14221 ◽  
Author(s):  
Tuan Liu ◽  
Bing Han ◽  
Liangdong Zhang ◽  
Min Wu ◽  
An Xing ◽  
...  
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Environmentally Friendly ◽  
Hyperbranched Polyether ◽  
First Time

A high performance, low cost, and environmentally friendly epoxy is demonstrated for the first time by copolymerizing a small amount of epoxide-terminated hyperbranched polyether with DGEBA.

scholarly journals Matsuda–Heck reaction with arenediazonium tosylates in water

2015 ◽  
Vol 11 ◽  
pp. 358-362 ◽  
Author(s):  
Ksenia V Kutonova ◽  
Marina E Trusova ◽  
Andrey V Stankevich ◽  
Pavel S Postnikov ◽  
Victor D Filimonov
Keyword(s):  
Microwave Heating ◽  
Heck Reaction ◽  
Environmentally Friendly ◽  
Diazonium Salts ◽  
First Time

An environmentally friendly Matsuda–Heck reaction with arenediazonium tosylates has been developed for the first time. A range of alkenes was arylated in good to quantitative yields in water. The reaction is significantly accelerated when carried out under microwave heating. The arylation of haloalkylacrylates with diazonium salts has been implemented for the first time.

scholarly journals "POLYHEDRAL CONTRACTION" OF TETRAMETHYLAMMONIUM CLOSO-CARBOUNDECABORATE UNDER ACTION OF TRIS(TRIPHENYLPHOSPHINE)RUTHENIUM DICHLORIDE

2020 ◽  
Vol 63 (5) ◽  
pp. 26-32 ◽  
Author(s):  
Vitalii E. Konoplev ◽  
Maxim V. Tachev ◽  
Elena A. Ulyukina
Keyword(s):  
Electronic Structure ◽  
Room Temperature ◽  
Ruthenium Complex ◽  
Structural Rearrangement ◽  
Methanol Solution ◽  
Classical Type ◽  
Triangular Face ◽  
Whole Process ◽  
Triethylbenzylammonium Chloride ◽  
First Time

In this paper the objectives were not only to investigate new promising methods leading to a deep structural rearrangement of carboranes and metallacarboranes but also to try to fix, to isolate and to characterize the intermediates. At the same time considerable attention is paid to the so-called "anti-wade" clusters formed during the reactions, the electronic structure of which does not correspond to their actually observed geometry. It is shown that the interaction of 11-vertex monocarbon closo-carboundecaborane with tris(triphenylphosphine)ruthenium dichloride leads to a series of new metallacarborane complexes. For the first time it was possible to control the process of "polyhedral contraction" of carborane {CB10} → (RuCB10} → {RuCB9} → {RuCB8} → {RuCB6} on the example of ruthenium complex and also to confirm experimentally each stage of the whole process. As a result of the reaction clusters of classical type and electron-deficient isocloso-/hypercloso-rutenacarborans {RuCB8}, {RuCB9} with 2n skeletal electrons were isolated. It is found that the interaction of tetramethylammonium closo-carboundecaborate with tris(triphenylphosphine)ruthenium dichloride proceeds in several stages. The first intermediate 12-vertex cluster is formed by mixing the initial reagents under heterogeneous conditions (methanol-THF, K2CO3, triethylbenzylammonium chloride) at room temperature for 10 hours. When the resulting complex is stirred in a mixture of methanol-THF solvents for 7 days at 20 °C, its almost quantitative transition to 11-vertex rutenacarborane was observed. Further transformation with the formation of a 10-vertex isocloso-rutenacarborane occurs when the methanol solution of this complex is boiled for 15 minutes. When the complex is boiled in methanol for 8 hours we obtained another extraordinary metallacarborane belonging to the rare 8-vertex pileo-clusters with a boron vertex built over the triangular face.

scholarly journals Oxidative Addition of Aryl Halides to a Ni(I)-Bipyridine Complex

2022 ◽  
Author(s):  
Stephen Ting ◽  
Wendy Williams ◽  
Abigail Doyle
Keyword(s):  
Oxidative Addition ◽  
Aryl Halides ◽  
Solution Phase ◽  
Nickel Catalysis ◽  
Mechanistic Studies ◽  
Redox Equilibrium ◽  
Aryl Bromides ◽  
First Time

The oxidative addition of aryl halides to bipyridine- or phenanthroline-ligated nickel(I) is a commonly proposed step in nickel catalysis. However, there is a scarcity of complexes of this type that both are well-defined and undergo oxidative addition with aryl halides, hampering organometallic studies of this process. We report the synthesis of a well-defined Ni(I) complex, [(CO2Etbpy)NiCl]4 (1). Its solution-phase speciation is characterized by a significant population of monomer and a redox equilibrium that can be perturbed by π-acceptors and σ-donors. 1 reacts readily with aryl bromides, and mechanistic studies are consistent with a mechanism proceeding through an initial Ni(I) → Ni(III) oxidative addition. Such a process was demonstrated stoichiometrically for the first time, affording a structurally characterized Ni(III) aryl complex.

scholarly journals Sclerotia Formation of Phlebopus Portentosus in Wild and Artificial Cultivation

2021 ◽  
Author(s):  
Tian-Wei Yang ◽  
Jing Liu ◽  
Xin-Jing Xu ◽  
Ming-Xia He ◽  
Feng Gao ◽  
...  
Keyword(s):  
Edible Mushroom ◽  
Whole Process ◽  
Edible Fungus ◽  
Water Drops ◽  
Set Up ◽  
Lower Temperature ◽  
Relationship Of ◽  
First Time ◽  
The Relationship ◽  
Sclerotium Formation

Abstract Phlebopus portentosus is a favorite wild edible mushroom in the Xishuangbanna region, Yunnan, China and in northern Thailand. This bolete has a unique biotrophy. It can be saprobic but also form a tripartite association with root mealy bugs and plants. P. portentosus is the only edible fungus of Boletales in the world that can be cultivated artificially and anniversary produced at present. Sclerotium is often found at its natural environment and cultivated media, but the regularity and growth characteristics of the sclerotium are unknown. In this study the whole process of birth, growth, death and rebirth of the sclerotium of P. portentosus at the national and lab conditions was reported for the first time. The sclerotium formation in the nature is related to adversity, such as reduced rainfall and low temperature. The more rainfall, the less sclerotia. It seems that the lower temperature increased the sclerotium formation, however the relationship of the sclerotium formation to temperature was not obvious as the rainfall. Under artificial conditions the sclerotium formation of P. portentosus is related to the fungus physiological maturation, and the sclerotium occurrence always accompanied by appearance of the water drops on the colony. The result will set up a platform for research on importance of the sclerotium in life circle of P. portentosus.

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