Defected Graphene as Ammonia Sensor: Theoretical Insight

2019 ◽  
Vol 19 (6) ◽  
pp. 2031-2038 ◽  
Author(s):  
Sushmita Dandeliya ◽  
Srivastava Anurag
2017 ◽  
Vol 15 (3) ◽  
pp. 41
Author(s):  
Zoltán Szűts ◽  
Jinil Yoo

Tanulmányunk témája a netsemlegesség. Először magát a fogalmat definiáljuk többféle módon, majd a netsemlegességgel kapcsolatos törvényhozói, internet- és tartalomszolgáltatói, valamint felhasználói kihívásokat, problémákat és válaszokat mutatjuk be. Számos szerző szerint az internet legnagyobb, immár tradicionális értéke a nyíltság, sokszínűség, tartalomgazdagság, tértől és időtől független társadalmi és perszonális kommunikációba való szabad belépés és a szabad verseny lehetősége. A netsemlegesség mellett és ellen felhozott érvek bemutatását is ezek a szempontok alapján tesszük. Kiemelt szerepet kap a netsemlegesség megsértésének kategorizálása is. Tanulmányunkban közlünk egy törvényalkotási kronológiát, mely az USA-ra, az EU-ra és Kelet-Ázsiára fókuszál, illetve ismertetjük a BEREC 2011-es felmérésének az EU-ban alkalmazott, internetszolgáltatói gyakorlatra vonatkozó eredményeit. A munkát az Internet.org kezdeményezést vizsgáló esettanulmány zárja, végül ezt követik a jövővel kapcsolatos kérdések, és néhány lehetséges válasz. --- Net neutrality - definitions and the standpoints of legislators, content providers, Internet service providers and users This article examines the topic of net neutrality. Firstly, it provides us with a theoretical insight and several definitions. Then it presents the issues and challenges legislators, ISP’s, content providers and users face. Several authors state that the biggest virtue and value of Internet lies in open access, diversity, richness of content, free competition, and low barrier entry for users in order to participate in personal social communication. Our presentation of arguments pro and cons net neutrality will be built on the basis of these considerations. Priority will be given to the introduction of several categories of net neutrality violations. In our paper we will present a legislative chronology in the topic focusing on USA, EU and Korea-Japan as well as the findings of the 2011 BEREC survey. Finally we examine the Internet.org project. In the conclusion, the article offers several more issues to be discussed and provides some possible answers.


2021 ◽  
Author(s):  
Junli Chang ◽  
Liping Jiang ◽  
Guangzhao Wang ◽  
Yuhong Huang ◽  
Hong Chen

The optical absorption performance of the perovskite FAPbI3 in the visible-light range is significantly improved by constructing a CdS/FAPbI3 heterostructure.


Organics ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 38-49
Author(s):  
Lakhdar Benhamed ◽  
Sidi Mohamed Mekelleche ◽  
Wafaa Benchouk

Experimentally, a reversal of chemoselectivity has been observed in catalyzed Diels–Alder reactions of α,β-unsaturated aldehydes (e.g., (2E)-but-2-enal) and ketones (e.g., 2-hexen-4-one) with cyclopentadiene. Indeed, using the triflimidic Brønsted acid Tf2NH as catalyst, the reaction gave a Diels–Alder adduct derived from α,β-unsaturated ketone as a major product. On the other hand, the use of tris(pentafluorophenyl)borane B(C6F5)3 bulky Lewis acid as catalyst gave mainly the cycloadduct of α,β-unsaturated aldehyde as a major product. Our aim in the present work is to put in evidence the role of the catalyst in the reversal of the chemoselectivity of the catalyzed Diels–Alder reactions of (2E)-but-2-enal and 2-Hexen-4-one with cyclopentadiene. The calculations were performed at the ωB97XD/6-311G(d,p) level of theory and the solvent effects of dichloromethane were taken into account using the PCM solvation model. The obtained results are in good agreement with experimental outcomes.


2020 ◽  
Vol 28 (1) ◽  
pp. 15-32
Author(s):  
Silvia Gazzola ◽  
Paolo Novati

AbstractThis paper introduces and analyzes an original class of Krylov subspace methods that provide an efficient alternative to many well-known conjugate-gradient-like (CG-like) Krylov solvers for square nonsymmetric linear systems arising from discretizations of inverse ill-posed problems. The main idea underlying the new methods is to consider some rank-deficient approximations of the transpose of the system matrix, obtained by running the (transpose-free) Arnoldi algorithm, and then apply some Krylov solvers to a formally right-preconditioned system of equations. Theoretical insight is given, and many numerical tests show that the new solvers outperform classical Arnoldi-based or CG-like methods in a variety of situations.


RSC Advances ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 5556-5567
Author(s):  
S. Krishnan ◽  
K. Senthilkumar
Keyword(s):  

Numerous studies have reported that the shape of a sensitizer matters for DSSC performance, while the present study investigates why and how it matters.


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