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Now showing items 1-20 of 1995

2-Aryl-6,8-Dibromo-4-Chloroquinazoline as scaffold for the synthesis of Novel 2,6,8-Triaryl-4-(Phenylethynyl)Quinazolines with potential photophysical properties

Paumo, Hugues Kamdem (2014-06)

The 2-aryl-6,8-dibromoquinazolin-4(3H)-ones were prepared in a single-pot operation by condensing 6,8-dibromoanthranilamide and aryl aldehydes in the presence of molecular iodine in ethanol. Treatment of the 2-aryl-6,8-d ...
2-ARYL-6,8-Dibromoquinolinones as synthons for the synthesis of Polysubstituted 4-ARYL-6-Oxopyrrolo [3,2,1-ij] Quinolines

Oyeyiola, Felix Adetunji (2015-09)

The known 2-aryl-6,8-dibromo-2,3-dihydroquinolin-4(1H)-ones 122 were dehydrogenated using thallium(III) p-tolylsulfonate in dimethoxyethane under reflux to afford the 2-aryl-6,8-dibromoquinolin-4(1H)-ones 136. Palladium-catalyzed ...
2.2 and 1300 μm observations of a complete sample of southern quasars

Chini, R.; Kreysa, E.; Wargau, Walter, 1948- (1997)

We present 2.2 and 1300 μm data of a complete sample of optically selected southern quasars. All objects have 1300 μm flux densities below ≈ 20 mJy (3σ), except QSO 0448 - 392 which shows a faint signal of ≈ 40 mJy. These ...
A 3-dimensional security classification for information

Smuts, W (South African Computer Society (SAICSIT), 1999)

Most existing information security classification schemes use a 1-dimensional scale such as [top secret, secret, employee confidential, company confidential, restricted]. These classification schemes do not differentiate ...
A 4IR framework for ICT evaluation : a case from South African SMEs

Kademeteme, Edzai (2020-09)

The rapid advancement of information and communication technologies (ICTs) and the immense benefits they present to organisations have made ICT innovations prominent. However, there is a constant contention between ICTs ...
A 6-dimensional security classification for information

Smuts, W (1998)

Most existing information security classification schemes use a 1-dimensional scale such as [top secret, secret, employee confidential, company confidential, restricted]. These classification schemes do not differentiate ...
Ab initio molecular orbital theoretical studies of the molecular complexes of boron trifluoride and oxygen electron donor ligands

Modau, Eric (2021-10)

The optimized geometrical structures, the interaction energies, the basis set superposition errors (BSSEs) and the infrared spectra of the monomers, homodimers and the molecular complexes formed between BF3 and a number of ...
Abatement of humic acid from aqueous solution using a carbonaceous conjugated microporous polymer derived from waste polystyrene

Chaukura, Nhamo; Moyo, Welldone; Mamba, B.B.; Nkambule, Thabo L. (© Springer-Verlag GmbH Germany, part of Springer Nature, 2017)

Humic acid (HA) is a major constituent of natural organic matter (NOM) found in water systems. Although NOM generally does not have any known harmful effects to humans, it imparts repulsive organoleptic properties to water, ...
Absorption spectroscopy and surface enhanced vibrational techniques for monitoring dephosphorylation and phosphorylation reactions in model compounds

Eguzozie, Kennedy Uchenna (2012-06)

Mechanistic aspects of phosphorylation, dephosphorylation, pyrophosphorylation and depyrophosphorylation reactions that mimic phosphorylases, dephosphorylases, pyrophosphorylases and depyrophosphorylases have been studied ...
The abstraction-first approach to encouraging reuse

Machanick, Philip (South African Computer Society (SAICSIT), 1997)

Experience in industry suggests that reuse does not happen without retraining, despite the fact that many experienced software engineers accept that reuse ought to be more efficient than coding from scratch. A possible ...
Abstracts of Old mutual conference for Ph.D and M.Sc students In Computer Science, Stellenbosch, 2-3 October 1987

Unknown author (Computer Society of South Africa (on behalf of SAICSIT), 1987)
Academic CS/IS infrastructure in South Africa; an exploratory stakeholder perspective

Bytheway, A; Hearne, G (1998)

In considering the requirements of an academic infrastructure that might support computer science and information systems education in South Africa, it is easy to be driven solely by the opportunities that innovative ...
Academic group and forum on Facebook : social, serious studies or synergy?

De Villiers, Mary Ruth; Pretorius, Marco Cobus (2012-09)

An academic group and discussion forum were established on Facebook for a cohort of postgraduate students studying the concepts and principles of eLearning. The Forum had a constructivist, student-centric ethos, in which ...
Academic institution and software vendor partnership

Van Niekerk, C (1998)

This talk will cover the following areas of importance to this problem: • Problems that Academic Institutions are facing today. • How Computer Associates want to get involved. • Overview of the Technology we are ...
Academic use of a group on Facebook : initial findings and perceptions

De Villiers, Mary Ruth (2010)

Social networking sites, especially Facebook, are an integral part of the lifestyle of contemporary youth. The facilities are increasingly being used by older persons as well. Usage is mainly for social purposes, but the ...
An access control architecture for XML documents in workflow environments

Botha, R; Eloff, J (2001)

The eXtensible Markup Language {XML) are being upheld as having the potential to change the way business is conducted. This will be effected by changing the way in which information is shared. However, with the sharing of ...
Access control needs in an electronic workflow environment

Botha, RA (2000)

This paper defines an electronic workflow environment as being conducive to the performance of business processes according to certain policies and practices in an electronic fashion. The workflow procedure will be facilitated ...
Access control with automated on duty notification tool in air traffic services

Ntombela, Nkululeko; Umenne, Patrice (IEEE, 2020-08-04)

This project provides a solution that alerts management if an Air Traffic Service Unit (ATSU) tower is unmanned during operational hours. The project makes provision for an access control with an automated on duty notification ...
Accessible computer interaction for people with disabilities : the case of quadriplegics

Kotze, Paula, 1956-; Eloff, Mariki; Adesina-Ojo, Ayodele (6th International Conference on Enterprise Information Systems, Porto, Portugal, 14 – 17 April 2004, 2004-04)

Universal design is the design of products and environments so that anyone can use them without adaptation or specialised design. Life must be simplified by making products, communications and the built environment more ...
Accessing subroutine libraries on a network

Greenwood, PH; Nash, PE (South African Computer Society (SAICSIT), 1992)

The purchase cost of specialized subroutine libraries can be high, especially if they need to be duplicated on several hosts on a local area network. A remote library access system has been designed, and a prototype built, ...

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