The carbon-carbon triple bond as a tool to design organic semiconductors for photovoltaic applications: an assessment of prospects and challenges

2021 ◽  
Author(s):  
Mirko Seri ◽  
Assunta Marrocchi
Keyword(s):  
Organic Semiconductors ◽  
Triple Bond ◽  
Research Focus ◽  
Recent Advances ◽  
Photovoltaic Applications ◽  
The Subject ◽  
Intense Research

Alkyne-containing organic semiconductors are once again becoming the subject of intense research focus, and recent advances have significantly enhanced their performance in optoelectronics. This perspective focuses on the results achieved...

scholarly journals A Comparative Study of Target Tracking Approaches in Wireless Sensor Networks

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Asmaa Ez-Zaidi ◽  
Said Rakrak
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Target Tracking ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Future Directions ◽  
Wide Range ◽  
Comprehensive Survey ◽  
The Subject ◽  
Intense Research

Wireless sensor networks have been the subject of intense research in recent years. Sensor nodes are used in wide range of applications such as security, military, and environmental monitoring. One of the most interesting applications in wireless sensor networks is target tracking, which mainly consists in detecting and monitoring the motion of mobile targets. In this paper, we present a comprehensive survey of target tracking approaches. We then analyze them according to several metrics. We also discuss some of the challenges that influence the performance of tracking schemes. In the end, we conduct detailed analysis and comparison between these algorithms and we conclude with some future directions.

Recent Advances in the Synthesis of Polyfluorenes as Organic Semiconductors

2004 ◽  
Vol 814 ◽  
Author(s):  
David J. Brennan ◽  
Yu Chen ◽  
Shaoguang Feng ◽  
James P. Godschalx ◽  
Gary E. Spilman ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Semiconductor Film ◽  
Melting Temperatures ◽  
Alternating Copolymers ◽  
Polymeric Semiconductor ◽  
Recent Advances ◽  
Thermal Cleavage ◽  
Switching Characteristics ◽  
Initial Results ◽  
Bottom Gate

AbstractNew poly(fluorene-thiophene) alternating copolymers are described in which either the dioctylfluorene or bithiophene units in poly(9,9-dioctylfluorene-alt-bithiophene) (F8T2) are replaced by other fluorene or thiophene-based groups, respectively. Improvements in solubility are realized when the bithiophene unit of F8T2 is replaced by dihexylterthiophene or dihexylpentathiophene units. Melting temperatures are also lowered by 50 – 100°C in these polymers when compared to F8T2. Replacement of the bithiophene unit of F8T2 with a dihexylpentathiophene unit also results in a significant improvement in hysteresis (< 2 V vs. 3.5 – 5 V for F8T2). Initial results are also reported on the thermal cleavage of the C8 side groups of F8T2, which yields an insoluble polymeric semiconductor film that continues to exhibit transistor switching characteristics as part of a bottom gate device.

Recent Advances in the Computational Characterization of π-Conjugated Organic Semiconductors

2019 ◽  
pp. 37-106
Author(s):  
Jean-Luc Bredas ◽  
Xiankai Chen ◽  
Thomas Körzdörfer ◽  
Hong Li ◽  
Chad Risko ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Recent Advances ◽  
Conjugated Organic Semiconductors

Assessing the Benefit of Innovations in ATC

1998 ◽  
Vol 51 (3) ◽  
pp. 312-320
Author(s):  
S. Ratcliffe
Keyword(s):  
Free Flight ◽  
New Approaches ◽  
Quantitative Studies ◽  
Traffic Capacity ◽  
Recent Advances ◽  
The Subject

Recent advances in technology have encouraged proposals for new approaches to ATC in Europe and elsewhere. Two such proposals, both rather loosely framed, are for ‘free flight’ or for ‘seamless contracts’; otherwise ‘tubes of flight’. These concepts, and variations on them, aim to increase the traffic capacity of the airspace. They have been the subject of numerous published papers. Given the declared objects of these systems, it is surprising that, nearly without exception, these papers discuss the proposals only in qualitative terms. The present paper discusses idealised versions of these systems on the basis of quantitative studies. It is concluded that the ‘seamless contract’ is very probably unworkable in Europe. ‘free flight’ is workable in principle, but there is a need for investigation of possible mechanisms by which last-minute problems may be resolved.

scholarly journals Selenoproteins and Their Impact on Human Health Through Diverse Physiological Pathways

Physiology ◽  
2006 ◽  
Vol 21 (5) ◽  
pp. 307-315 ◽  
Author(s):  
Behzad Moghadaszadeh ◽  
Alan H. Beggs
Keyword(s):  
Trace Element ◽  
Human Health ◽  
Functional Characterization ◽  
Physiological Effects ◽  
Recent Advances ◽  
The Subject ◽  
Physiological Pathways ◽  
Complex Regulation

In the last few decades, the importance of selenium in human health has been the subject of numerous studies. It is believed that the physiological effects of selenium occur mainly through the function of selenoproteins, which incorporate selenium in the form of one or more selenocysteine residues. Recent advances in understanding the complex regulation of selenoprotein synthesis and functional characterization of several members of the selenoprotein family have contributed to an improved comprehension of the role(s) of selenium in human health and the great diversity of physiological pathways influenced by this trace element.

scholarly journals Some Remarks on Stellar Pulsation

2000 ◽  
Vol 176 ◽  
pp. 528-537
Author(s):  
Douglas Gough
Keyword(s):  
Scientific Discussion ◽  
Recent Advances ◽  
Stellar Pulsation ◽  
The Subject

AbstractI wondered at first why I had been asked to perform the task of commenting on the scientific discussion of this meeting, until a member of the Scientific Organising Committee pointed out to me that I have not published a serious paper on the subject of the colloquium in his memory (I am not sure whether this is more a statement of the seriousness of my publications, of my publication frequency or of the duration of Jørgen’s memory); however, I am presumably considered to be unbiased by recent advances. Nevertheless, the time allotted (for the oral address) and the corresponding space (in these published proceedings) are inadequate for a complete and balanced review – in any case, that is hardly either desirable or necessary, since the discussions are all still fresh in our minds – and therefore I have been freed to comment personally on some selected issues that have captured my interest.

Progesterone interaction with sperm plasma membrane, calcium influx and induction of the acrosome reaction

1999 ◽  
Vol 7 (2) ◽  
pp. 81-93 ◽  
Author(s):  
Christopher Bray ◽  
Jackson CK Brown ◽  
Steve Publicover ◽  
Christopher LR Barratt
Keyword(s):  
Plasma Membrane ◽  
Steroid Hormones ◽  
Nuclear Receptors ◽  
Acrosome Reaction ◽  
Calcium Influx ◽  
Membrane Receptors ◽  
Sperm Plasma Membrane ◽  
The Subject ◽  
Genomic Effects ◽  
Intense Research

In contrast to the classic action of steroid hormones through cytoplasmic/nuclear receptors, there is an accumulating body of data which strongly suggests that they have a direct effect on cells mediated through putative membrane receptors, a so-called non-genomic action. Although such non-genomic effects were discovered 50 years ago it is only in the last 15 years that the subject has become an area of intense research.

Recent Advances in Knowledge of Rubber Friction and Tire Wear

1968 ◽  
Vol 41 (1) ◽  
pp. 209-244 ◽  
Author(s):  
A. Schallamach
Keyword(s):  
Abrasion Resistance ◽  
Equivalence Principle ◽  
Recent Advances ◽  
Rubber Friction ◽  
Tire Wear ◽  
The Subject ◽  
Good For ◽  
Road Testing

Abstract Progress in the last few years in understanding rubber friction and tire wear justifies a survey of developments since a review of the subject in 1958. Work on fundamental of friction and abrasion has mainly evolved from conceptions formed in the earlier investigations; it had, however, not been realized that wear of tires and, indeed, abrasion on certain laboratory machines brings into play gross properties of the tire or testpiece which affect rate of wear just as much as the actual abrasion resistance of the tread compound. This new field of research has led to rationalization of road testing, and has helped to bridge the gap between laboratory and road. A report on these developments is given. Much of the work is concerned with the viscoelastic nature of rubber friction and abrasion, which has come to light through the experimentally established validity of the rate-temperature equivalence principle for these processes. This principle, which holds good for all viscoelastic processes, is briefly described in the next section in order not to interrupt the subsequent argument.

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