Distribution grid codes : opportunities and challenges

Traditional distribution networks were not originally designed to accommodate power generation facilities. The installation of distributed generation (DG) units with significatn capacity in these passive networks can cause reverse power flows which will result in some conflicts with the operation of the existing protection system. In this context, utilities around the world have started establishing requirements to ensure safe and reliable interconnection of generators in low- and medium-voltage networks. Grid interconnection is presently one of the most important issues involving DG. This paper presents a critical review of the requirements adopted by distribution companies in selected countries such as the USA, the UK, germany and Australia to facilitate the connection of DG. Critical issues such as voltage regulation, islanding operation, dynamic interactions among DG and loads are discussed to identify a few points where attention is still needed to improve the reliability of distribution systems

Ternary graphite nanosheet/copper phthalocyanine/sulfonated poly(aryl ether ketone) dielectric percolative composites: Preparation, micromorphologies and dielectric properties

Novel ternary dielectric percolative composites, consisting of acidified graphite nanosheets (a-GNs)/copper phthalocyanine (CuPc)/sulfonated poly (aryl ether ketone) (SPAEK), were fabricated using a simple solution blending technique. A functional intermediate CuPc layer was introduced and coated on a-GNs to ensure a good dispersion of a-GNs in the SPAEK matrix and suppress the mobility of free charge carriers effectively, resulting in significant improvement of the dielectric properties of a-GNs@CuPc/SPAEK in contrast to a-GNs/SPAEK. Furthermore, enhanced mechanical properties of a-GNs@CuPc/SPAEK compared to SPAEK have been also achieved. © 2014 the Partner Organisations.

Visible and UV functionality of TiO2 ternary nanocomposites on cotton

This research intends to increase the photocatalytic efficiency of cotton fabrics coated with TiO2-based nanocomposites under illumination particularly visible light. The fabrics were functionalized using a low-temperature sol-gel method of TiO2/Metal/SiO2 nanocomposite systems. Integrating silica and noble metals into TiO2 sol was put forth for boosting its functionality. Three noble metals (gold (Au), platinum (Pt) and silver (Ag)) with four different concentrations were employed. The photocatalytic activity of the functionalized fabrics was assessed through coffee stain-removal test and photodecomposition of methylene blue (MB) under UV and visible light. The impact of coating layers on fabrics' hydrophilicity was analyzed through measuring the water contact angle as well as the water absorption time. The fabrics were characterized using XRD, SEM and EDS. It was corroborated that the presence of silica enhanced the self-stain-removal capability of fabrics under UV. Moreover, the self-cleaning property of fabrics improved under both UV and visible light after integrating the metals into the colloids. In the same line, the self-cleaning activity threshold of fabrics was shifted to visible region.

A cross-cultural construct of the ethos of the corporate codes of ethics: Australia, Canada and Sweden

The objective of this paper is to develop and describe a construct of the ethos of the corporate codes of ethics (i.e. an ECCE construct) across three countries, namely Australia, Canada and Sweden. The introduced construct is rather unique as it is based on a cross-cultural sample seldom seen in the literature. While the outcome of statistical analyses indicated a satisfactory factor solution and acceptable estimates of reliability measures, some research limitations have been stressed. They provide a foundation for further research in the field and testing of the ECCE construct in other cultural and corporate settings. We believe that the ECCE construct makes a contribution to theory and practice in the field as it outlines a theoretical construct for the benefit of other researchers. It is also of managerial interest as it provides a grounded framework of areas to be considered in the implementation in organizations of corporate codes of ethics.

A cross cultural comparison of the contents of codes of ethics: USA, Canada and Australia

This paper examines the contents of the codes of ethics of 83 of the top 500 companies operating in the private sector in Australia in an attempt to discover whether there are national characteristics that differentiate the codes used by companies operating in Australia from codes used by companies operating in the American and Canadian systems. The studies that were used as a comparison were Mathews (1987) for the United States of America and Lefebvre and Singh (1992) for Canada. The major conclusion is that, whilst Australian codes do have some characteristics that differentiate them from the other two groups, it appears that companies in all three cultures are driven by the same motives to develop codes.

Signs and codes in early childhood: An investigation of young children’s creative approaches to communication

PEOPLE COMMUNICATE AND MAKE meaning through the use of the signs, codes and rules of their community and its language/s. On the way to learning these signs, codes and rules, children often create or invent their own unique and sometimes temporary systems of meaning making. In this paper we use Vygotsky’s concept of semiotic mediation and Bernstein’s code theory to reflect on some examples of children’s creative approaches to communication that involved the creation and use of signs. We will argue that young language learners’ invention of their own languages and creative use of drawing as a form of sign creation are symbolic expressions of their intent to generate and reinforce desired social and cultural situations of learning. We conclude that individuals mediate social and individual functioning in order to make meaning of their world, and argue for a move away from viewing second language learning and emergent writing as static sets of abilities to a more dynamic interpretation.

Designer Codes

If you’ve made it this far—and I’m sure many of you have—then you know what this article is about: QR codes, or Quick Response codes (also referred to, though less frequently, as mobile codes 2d barcodes, or 2d codes). QRs are not new by any stretch of the imagination. In fact, they’ve been around for about a decade and a half.

The impact of the 2008 economic recession on three residential property type investments: a case study of five diverse zip codes in Washington DC, USA

There has been 47 recessions in the United States of America (US) since 1790. US recessions have increasingly affected economies of other countries in the world as nations become more and more interdependent on each other. The worst economic recession so far was the “Great Depression” – an economic recession that was caused by the 1929 crash of the stock market in the US. The 2008 economic recession in the US was a result of the burst of the “housing bubble” created by predatory lending. The economic recession resulted in increased unemployment (according to NBER 8.7 million jobs were lost from Feb. 2008 to Feb. 2010); decrease in GDP by 5.1%; increase in poverty level from 12.1% (2007) to 16.0% (2008) (NBER) This dissertation is an attempt to research the impact of the 2008 economic recession on different types of residential investments: a case study of five (5) diverse neighborhoods/zip codes in Washington DC, USA The main findings were that the effect of the 2008 economic depression on the different types of residential properties was dependent on the location of the property and the demographics/socio-economic factors associated with that location.

Investigation in SrTiO3-CaTiO3-PbTiO3 ternary thin films by dielectric proprieties and Raman spectroscopy

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Factors affecting nucleolytic efficiency of some ternary metal complexes with DNA binding and recognition domains. Crystal and molecular structure of Zn(phen)(edda)

The binding selectivity of the M(phen)(edda) (M = Cu, Co, Ni, Zn; phen = 1,10-phenanthroline, edda = ethylenediaminediacetic acid) complexes towards ds(CG)(6), ds(AT)(6) and ds(CGCGAATTCGCG) B-form oligonucleotide duplexes were studied by CD spectroscopy and molecular modeling. The binding mode is intercalation and there is selectivity towards AT-sequence and stacking preference for A/A parallel or diagonal adjacent base steps in their intercalation. The nucleolytic properties of these complexes were investigated and the factors affecting the extent of cleavage were determined to be: concentration of complex, the nature of metal(11) ion, type of buffer, pH of buffer, incubation time, incubation temperature, and the presence of hydrogen peroxide or ascorbic acid as exogenous reagents. The fluorescence property of these complexes and its origin were also investigated. The crystal structure of the Zn(phen)(edda) complex is reported in which the zinc atom displays a distorted trans-N4O2 octahedral geometry; the crystal packing features double layers of complex molecules held together by extensive hydrogen bonding that inter-digitate with adjacent double layers via pi...pi interactions between 1,10-phenanthroline residues. The structure is compared with that of the recently described copper(II) analogue and, with the latter, included in molecular modeling. (C) 2008 Elsevier B.V. All rights reserved.

Arithmetic fuchsian groups and space time block codes

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)