174 research outputs found
Patching sulfur vacancies: A versatile approach for achieving ultrasensitive gas sensors based on transition metal dichalcogenides
No full textTransition metal dichalcogenides (TMDCs) garner significant attention for their potential to create high-performance gas sensors. Despite their favorable properties such as tunable bandgap, high carrier mobility, and large surface-to-volume ratio, the performance of TMDCs devices is compromised by sulfur vacancies, which reduce carrier mobility. To mitigate this issue, we propose a simple and universal approach for patching sulfur vacancies, wherein thiol groups are inserted to repair sulfur vacancies. The sulfur vacancy patching (SVP) approach is applied to fabricate a MoS2-based gas sensor using mechanical exfoliation and all-dry transfer methods, and the resulting 4-nitrothiophenol (4NTP) repaired molybdenum disulfide (4NTP-MoS2) is prepared via a sample solution process. Our results show that 4NTP-MoS2 exhibits higher response (increased by 200 %) to ppb-level NO2 with shorter response/recovery times (61/82 s) and better selectivity at 25 °C compared to pristine MoS2. Notably, the limit of detection (LOD) toward NO2 of 4NTP-MoS2 is 10 ppb. Kelvin probe force microscopy (KPFM) and density functional theory (DFT) reveal that the improved gas sensing performance is mainly attributed to the 4NTP-induced n-doping effect on MoS2 and the corresponding increment of surface absorption energy to NO2. Additionally, our 4NTP-induced SVP approach is universal for enhancing gas sensing properties of other TMDCs, such as MoSe2, WS2, and WSe2.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Bio-Electronic
The Patching of Built Ornamental Heritage using Digital Fabrication
No full textThe purpose of this research is to explore the role of LIDAR Technology and Digital Fabrication techniques in the field of architectural conservation, particularly for the patching of ornamental heritage. The information is compiled in the form of a guide. Information gathered via the aid of experiments and subsequent observations is also recorded. These experiments were performed using various professional 3D scanning, digital fabrication, and traditional mold making techniques for the transference of geometry. The case recorded in detail is the patching of a mechanically damaged Belgian Blue Limestone column fragment. Another aspect of the research is to explore the use of various mesh generation and manipulation methods. This information can then be used by conservationists to aid in conservation efforts when traditional methods are either not sufficient or not feasible, thereby exploring the role of the ‘Neo-craftsperson’ in the digital age. To gather subjective insight on the topic, professional conservationists were also interviewed and all opinions are recorded.Architecture and The Built EnvironmentArchitectural Engineering + Technolog
Afghanistan? Somewhere west of India, isn't it?
No full textFor more than 10 years, the senior co-author has been regularly testing tertiary journalism students on their 'news geography' - the ability to accurately locate on a world map 10 countries that had been in the news at the time, or with which Australia has or has had a bond. His co-author joined him in 1997 to compare results from two universities, Charles Sturt and Western Sydney. They joined forces again in 2002 to compare the geographic knowledge of first-year journalism students at Queensland University of Technology with that of senior students at the University of Queensland. the most surprising result was that despite "The War on Terror", and Australia's involvement, relatively few could accurately locate Afghanistan. For several years, the senior co-author has also tested first-year journalism students' knowledge of a series of a series of figures and statistics that give a barometer of the Australian and world economies. The latest monetary exchange rates are used to test students' knowledge of the various statistics journalists regularly rely on as indicators of economic movements. The authors also combined in 2002 to test students at QUT and UQ on this knowledge
Book review: The Sound Bite Society: Television and the American Mind
No full textScheuer, Jeffrey (1999) The Sound Bite Society: Television and the American Mind, Four Walls Eight Windows, New York, 230 pp. ISBN 1-56858-141-6. Reviewed by Roger Patching The central theme of the book – that American television is tailor-made for the simple ‘sound bite’ messages of the right and gives little coverage to liberals because their messages are more complex and don’t fit neatly into the formula – is hard to accept. Scheuer also accuses TV of being responsible for the rise of the conservative right in US society. That’s not to say that the author, who has written for the New York Times, Washington Post, Chicago Tribune doesn’t present a powerful and interesting argument. It’s just that reading at it from the other side of the Pacific, it’s a bit hard to cop
Effect of Utility Cut Patching on Pavement Deterioration
No full textUtility Cut Patching (UCP) is a major cause of pavement deterioration in city streets. The streets of the city in Riyadh are no exception. A study was undertaken to investigate factors related to UCP and possibly contributing to pavement deterioration. Existing pavement condition, materials properties of patch and pavement, and geometry of trench were among factors investigated. Pavement deterioration
was evaluated by deflection measurements at various points on the patch and existing pavement using falling weight deflectometer, Analysis of the results indicated that deflection at center of patch is the most critical one. Furthermore, deflection readings at various points on the patch indicated the dependency of palthdeflection on trenchgeometry and existing pavement structural conditions. Investigation of patching effects on pavement roughness suggested an increase in roughness of pavement due to UCCorresponding Author:
Prof. Abdulrahman Saleh Al-Suhaibani, Department of Civil Engineering, College of Engineering, King Saud University,P.O. Box 800, Riyadh 11421
Saudi Arabia. Email: [email protected]
A Freeness Criterion Without Patching for Modules Over Local Rings
No full textInternational audienceAbstract It is proved that if is a local homomorphism of commutative noetherian local rings, a nonzero finitely generated B -module N whose flat dimension over A is at most is free over B and is a special type of complete intersection. This result is motivated by a ‘patching method’ developed by Taylor and Wiles and a conjecture of de Smit, proved by the first author, dealing with the special case when N is flat over A
'You can sweep the floor but don't expect to be allowed to stand on it': A cautionary tale of student journalists' experience during the Goodwill Games and CHOGM
No full textWhile organisers of major events like the Olympics, the Goodwill Games and CHOGM, actively seek out support from journalism faculties to provide students to do mainly\ud
menial tasks at media centres for these major events, when it comes to accrediting student journalists to report on these news events, it’s another matter. The author looks at the difficulties journalism students at QUT had in reporting the Goodwill\ud
Games and CHOGM for their broadcast outlets in Brisbane
Irreparable Defects Produced by the Patching of h-BN Frontiers on Strongly Interacting Re(0001) and Their Electronic Properties
No full textClarifying the origin and the electronic properties of defects in materials is crucial since the mechanical, electronic and magnetic properties can be tuned by defects. Herein, we find that, for the growth of h-BN monolayer on Re(0001), the patching frontiers of different domains can be classified into three types, i.e., the patching of B- and N-terminated (BlN-terminated) frontiers, BIB-terminated frontiers and NlN-terminated frontiers, which introduce three types of defects, i.e., the "heart" shaped moire-level defect, the nonbonded and bonded line defects, respectively. These defects were found to bring significant modulations to the electronic properties of h-BN, by introducing band gap reductions and in-gap states, comparing with perfect h-BN on Re(0001) with a band gap of similar to 3.7 eV. The intrinsic binary composition nature of h-BN and the strong h-BN-Re(0001) interaction are proposed to be cooperatively responsible for the formation of these three types of defects. The former one provides different types of h-BN frontiers for domain patching. And the later one induces multinucleation but aligned growth of h-BN domains on Re(0001), thus precluding their subsequent coalescence to some extent. This work offers a deep insight into the categories of defects introduced from the patching growth of two-dimensional layered materials, as well as their electronic property modulation through the defect engineering.National Key Research and Development Program of China [2016YFA0200103]; Beijing Municipal Science and Technology Commission [Z161100002116020]; Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201601]; National Natural Science Foundation of China [51290272, 51472008, 51432002, 50121091, 21201012]; National Basic Research Program of China [2013CB932603, 2014CB921002]SCI(E)ARTICLE165849-585613
A comprehensive and comparative analysis of the patching behavior of open source and closed source software vendors
No full textWhile many theoretical arguments against or in favor of open source and closed source software development have been presented, the empirical basis for the assessment of arguments is still weak. Addressing this research gap, this paper presents a comprehensive empirical investigation of the patching behavior of software vendors/communities of widely deployed open source and closed source software packages, including operating systems, database systems, web browsers, email clients, and office systems. As the value of any empirical study relies on the quality of data available, this paper also discusses in detail data issues, explains to what extent the empirical analysis can be based on vulnerability data contained in the NIST National Vulnerability Database, and shows how data on vulnerability patches was collected by the author to support this study. The results of the analysis suggest that it is not the particular software development style that determines patching behavior, but rather the policy of the particular software vendor
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